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## Index

`!` operator
  Expressions
`!in` operator
  Expressions | Expressions
`$` record constructor operator
  Expressions | Expressions
`$` record field access operator
  Accessing Fields Using ```$`''
`(` operator
  Expressions
`)` operator
  Expressions
`+` operator
  Expressions
`++` operator
  Expressions
`+` addition operator
  Arithmetic Operators | Temporal Addition | Expressions
`+` unary operator
  Arithmetic Operators
`-` subtraction operator
  Arithmetic Operators | Temporal Subtraction | Expressions
`-` unary operator
  Arithmetic Operators | Temporal Negation
`*` multiplication operator
  Arithmetic Operators | Temporal Multiplication | Expressions
`/` division operator
  Arithmetic Operators | Temporal Division | Expressions
`+=` operator
  Filtering
`-` operator
  Expressions
`-` operator
  Expressions
`4Dgifts` username
  The `hot-ids` Module
`:` operator
  Expressions
`"|"|` short-circuit ``or''
  Logical Operators | Expressions
`&&` short-circuit ``and''
  Logical Operators | Expressions
`!` ``not'' operator
  Logical Operators
<
  Arithmetic Operators
`T`
  Boolean Constants
`F`
  Boolean Constants
`%`modulus operator
  Expressions
``%`` format
  Predefined Functions
`=` operator
  Expressions
`==` equality operator
  Comparison Operators | Exact Pattern Matching | Expressions | Expressions
`"!``` exact match negation
  Exact Pattern Matching
`` exact pattern match operator
  Exact Pattern Matching
`"!=` inequality operator
  Comparison Operators | Exact Pattern Matching | Expressions | Expressions
`<` less-than operator
  Comparison Operators | Expressions
`<=` less-or-equal operator
  Comparison Operators | Expressions
`>` greater-than operator
  Comparison Operators | Expressions
`>=` greater-or-equal operator
  Comparison Operators | Expressions
`?` operator
  Expressions
`?$` record field test
  Expressions
`[` operator
  Expressions | Expressions
`]` operator
  Expressions | Expressions
aborted execution
  Flags
absolute time
  Temporal Types
access
  allowable /16 network pairs
    `hot` variables
  allowable address pairs
    `hot` variables
  allowable services
    `hot` variables
  fatal inbound services
    `hot` variables
  forbidden attempted services
    `hot` variables
  forbidden inbound services
    `hot` variables
  forbidden services
    `hot` variables
  sensitive /24 destination networks
    `hot` variables
  sensitive /24 source networks
    `hot` variables
  sensitive destination addresses
    `hot` variables
  sensitive source addresses
    `hot` variables
  service allowed to a particular host
    `hot` variables
  service allowed to particular host pairs
    `hot` variables
`account_tried` event
  `scan` event handlers
`ack above a hole` (possible packet drop message)
  Additional handlers for ``weird''
`ack_above_hole` event
  General Processing Events | Additional handlers for ``weird''
acknowledgment holes
  Additional handlers for ``weird''
actions
  Actions for ``weird'' events | Actions for ``weird'' events | Actions for ``weird'' events | Actions for ``weird'' events | Actions for ``weird'' events | Actions for ``weird'' events | Actions for ``weird'' events
  `WEIRD_FILE`
    Actions for ``weird'' events
  `WEIRD_IGNORE`
    Actions for ``weird'' events
  `WEIRD_LOG_ALWAYS`
    Actions for ``weird'' events
  `WEIRD_LOG_ONCE`
    Actions for ``weird'' events
  `WEIRD_LOG_PER_CONN`
    Actions for ``weird'' events
  `WEIRD_LOG_PER_ORIG`
    Actions for ``weird'' events
  `WEIRD_UNSPECIFIED`
    Actions for ``weird'' events
`activating_encryption` event
  `login` event handlers
`active` module
  The `active` Module
`active_conn` variable
  The `active` Module
`active_connection` function
  Predefined Functions
`active_connection_reuse` (``weird'' event)
  Events handled by `conn_weird`
`active_file` function
  Predefined Functions
`add` keyword
  Statements
`add` statement
  Statements
`&add_func` attribute
  Refinement
`add_interface` function
  Predefined Functions
`add_tcpdump_filter` function
  Predefined Functions
addition
  numeric
    Arithmetic Operators
  temporal
    Temporal Addition
additional information associated with a connection
  The `connection` record | Connection summaries
`addl`
  The `connection` record
  `connection` field
    The `connection` record
`addl_web` variable
  `scan` variables
`addr`
  see types, `addr`
address masking
  Net Type | Predefined Functions | Predefined Functions
address scanning
  The `scan` Analyzer
address type
  Address Type to Address Operators
  constants
    Address Constants
  operators
    Address Operators
addresses
  hot destinations
    `hot` variables
  hot sources
    `hot` variables
  in a connection
    Connection summaries
  local
    Site variables | Site variables | Site variables | Site-specific functions
  mapping to hostnames
    The hf utility
  neighbor
    Site variables | Site variables | Site variables
`addrs`
  The `dns_mapping` record
  `dns_mapping` field
    The `dns_mapping` record
`\a` alert escape
  String Constants
`allow_16_net_pairs` variable
  `hot` variables
`allow_pairs` variable
  `hot` variables
`allow_services` variable
  `hot` variables
`allow_services_pairs` variable
  `hot` variables
`allow_services_to` variable
  `hot` variables
`allow_spoof_services` variable
  `hot` variables
allowable /16 network pairs
  `hot` variables
allowable address pairs
  `hot` variables
altering log files
  `login` variables
`always_hot_ids` variable
  The `hot-ids` Module
`always_hot_login_ids` variable
  `login` variables
`analy` analyzer
  The `analy` Analyzer
analysis
  bidirectional vs. unidirectional
    Events handled by `conn_weird`
  off-line
    Traffic traces | Flags | Predefined Functions | Connection functions
  on-line
    Live traffic | Flags | Predefined Variables | Predefined Functions | Connection functions
analyzers
  Analyzers and Events to The `interconn` Analyzer
  load
    Loading Analyzers
  `print-filter`
    Filtering | Filtering
  `print-filter`
    Filtering
  `conn`
    Generic Connection Analysis
  `tcp`
    no title
  `udp`
    no title
  `site`
    Site-specific information
  `hot`
    The `hot` Analyzer
  `scan`
    The `scan` Analyzer
  `finger`
    The `finger` Analyzer
  `ftp`
    The `ftp` Analyzer
  `http`
    The `http` Analyzer
  `ident`
    The `ident` Analyzer
  `login`
    The `login` Analyzer
  `portmapper`
    The `portmapper` Analyzer
  `analy`
    The `analy` Analyzer
  activating
    Activating an Analyzer
  application-specific
    The `finger` Analyzer to `portmapper` event handlers
  filtering
    Filtering to Filtering
  finger
    event handlers
      `finger` event handlers to `finger` event handlers
    variables
      `finger` variables to `finger` variables
  ftp
    event handlers
      `ftp` event handlers to `ftp` event handlers
    functions
      `ftp` functions to `ftp` functions
    variables
      `ftp` variables to `ftp` variables
  generic
    Generic Connection Analysis to Connection functions
  hot
    functions
      `hot` functions to `hot` functions
    variables
      `hot` variables to `hot` variables
  http
    event handlers
      `http` event handlers to `http` event handlers
    variables
      `http` variables to `http` variables
  ident
    event handlers
      `ident` event handlers to `ident` event handlers
    variables
      `ident` variables to `ident` variables
  instantiating
    Activating an Analyzer
  loading
    Loading Analyzers
  login
    event handlers
      `login` event handlers to `login` event handlers
    functions
      `login` functions to `login` functions
    variables
      `login` variables to `login` variables
  portmapper
    event handlers
      `portmapper` event handlers to `portmapper` event handlers
    functions
      `portmapper` functions to `portmapper` functions
    variables
      `portmapper` variables to `portmapper` variables
  scan
    event handlers
      `scan` event handlers to `scan` event handlers
    functions
      `scan` functions to `scan` functions
    variables
      `scan` variables to `scan` variables
  site-specific information
    Site-specific information to Site-specific functions
`&&` ``and'' operator
  Logical Operators | Expressions
anonymous function expression
  Expressions
anticode.com
  `login` variables
``any'' type
  The `any` type to The `any` type
  replacing with union type
    Predefined Functions
`any_RPC_okay` variable
  `portmapper` variables
appending to a file
  Predefined Functions
arithmetic expression
  Expressions
array
  associative
    Tables
  multi-dimensional
    Declaring Tables
as
  Files
  `RLIMIT_NOFILE`
    Files
ASCII
  as usual character set
    String Operators
assigning records
  Record Assignment to Record Assignment
assignment expression
  Expressions
associative array
  Tables
attack
  Land
    `hot` functions
attackers
  weenie
    The `hot-ids` Module
attacks
  smurf
    `login` variables
`ATTEMPT_INTERVAL` internal variable
  Generic TCP connection events
attempted connections
  Generic TCP connection events
attempted services
  forbidden
    `hot` variables
attributes
  Attributes
  `&add_func`
    Refinement
  `&create_expire`
    Table Attributes
  `&default`
    Table Attributes
  `&delete_func`
    Refinement
  `&expire_func`
    Table Attributes
  `&read_expire`
    Table Attributes
  record fields
    Record Assignment
  `&redef`
    Refinement
  `&write_expire`
    Table Attributes
`auth error` (RPC status code)
  `portmapper` functions
`auth-failed/` authentication annotation
  `login` event handlers
`auth/` authentication annotation
  `login` event handlers
authentication
  accepted
    `login` event handlers
  rejected
    `login` event handlers
  skipped
    `login` event handlers
authentication annotations
  `ident` event handlers | `login` event handlers | `login` event handlers | `login` event handlers | `login` event handlers | `login` event handlers
  `auth-failed/`
    `login` event handlers
  `auth/`
    `login` event handlers
  `confused/`
    `login` event handlers | `login` event handlers
  `ident/`
    `ident` event handlers
  `(skipped)`
    `login` event handlers
authentication dialog
  Predefined Functions | Predefined Functions | The `login` Analyzer | `login` analyzer confusion
  evasion
    `login` analyzer confusion
`authentication_accepted` event
  `login` event handlers
`authentication_rejected` event
  `login` event handlers
`authentication_skipped` event
  `login` event handlers
avoiding processing
  Predefined Functions
backdoor
  avoiding false positives
    `login` variables
  prompts
    `login` variables
  triggered by ephemeral port
    `login` variables
  triggered by terminal type
    `login` variables
`backdoor_prompts` variable
  `login` variables
backspace character
  Predefined Functions
`\b` backspace escape
  String Constants
bad address mask
  run-time error
    Predefined Functions
bad fmt date argument
  run-time error
    Predefined Functions
bad fmt editing character
  run-time error
    Predefined Functions
bad fmt field width
  run-time error
    Predefined Functions
bad fmt floating-point argument
  run-time error
    Predefined Functions
bad fmt format specifier
  run-time error
    Predefined Functions
bad fmt integer argument
  run-time error
    Predefined Functions
bad fmt precision
  run-time error
    Predefined Functions
`bad format`
  Predefined Functions
bad length argument (not a table or set)
  run-time error
    Predefined Functions
`bad second argument to mask_addr()`
  Predefined Functions
bad time
  `bad time`
    format conversion error
      Predefined Functions
`bad type for Date format`
  Predefined Functions
`bad type for floating-point format`
  Predefined Functions
`bad type for integer format`
  Predefined Functions
`bad_HTTP_reply` (``weird'' event)
  Events handled by `conn_weird`
`bad_HTTP_version` (``weird'' event)
  Events handled by `conn_weird`
`bad_ICMP_checksum` (``weird'' event)
  Events handled by `conn_weird`
`bad_ident_reply` (``weird'' event)
  Events handled by `conn_weird_addl`
`bad_ident_request` (``weird'' event)
  Events handled by `conn_weird_addl`
`bad_IP_checksum` (``weird'' event)
  Events handled by `net_weird`
`bad_option` event
  `login` event handlers
`bad_option_termination` event
  `login` event handlers
`bad_pm_port` (``weird'' event)
  Events generated by the
`bad_rlogin_prolog` (``weird'' event)
  Events handled by `conn_weird`
`bad_RPC` (``weird'' event)
  Events handled by `conn_weird`
`bad_RPC_program` (``weird'' event)
  Events handled by `conn_weird`
`bad_SYN_ack` (``weird'' event)
  Events handled by `conn_weird`
`bad_TCP_checksum` (``weird'' event)
  Events handled by `conn_weird`
`bad_TCP_header_len` (``weird'' event)
  Events handled by `net_weird`
`bad_UDP_checksum` (``weird'' event)
  Events handled by `conn_weird`
`baroque_SYN` (``weird'' event)
  Events handled by `conn_weird`
beginning time of a connection
  The `connection` record | Connection summaries
`\a` bell escape
  String Constants
bidirectional vs. unidirectional analysis
  Events handled by `conn_weird`
big endian
  Predefined Functions | The `analy` Analyzer
`/bin/eject` exploit
  `login` variables
BIND
  non-blocking DNS lookups
    The Bro source code
`blank_in_HTTP_request` (``weird'' event)
  Events handled by `conn_weird`
`bool`
  see types, `bool`
booleans
  Booleans to Logical Operators
Bourne shell
  Predefined Functions
BPF (Berkeley Packet Filter)
  tuning
    Tuning BPF
BPF buffers
  ensuring they are large
    Tuning BPF
`break` keyword
  Statements
`break` statement
  Statements
Bro
  checkpointing
    Flags
  execution aborted
    Flags
  flags
    `-P`
      The `dns` Module
    `-f`
      Flags
    `-h`
      Flags
    `-i`
      Flags
    `-p`
      Flags
    `-r`
      Flags
    `-w`
      Flags
    `-v`
      Flags
    `-F`
      Flags
    `-O`
      Flags
    `-P`
      Flags
    `-W`
      Flags
  installing
    Building and installing Bro
  interactive use
    Using Bro interactively
  not running as root
    Tuning BPF
  optimizer
    Flags
  private caches
    Flags | Flags
  references
    Introduction
  running
    Running Bro
  search path
    Run-time environment
  shadow
    Filtering
  source code
    The Bro source code
  startup slow due to compiling regular expressions
    Flags
  system configuration
    Tuning BPF
  usage
    Flags
  version
    Flags
  watchdog
    Flags
  web page
    The Bro source code
  wedging
    Flags
Bro bugs/limitations
  causing ``weird'' events
    The `weird` Module
`.bro` suffix
  Run-time environment
`.bro-dns-cache`
  The `dns` Module
`.bro-RE-cache.v1`
  Flags
`bro_done` event
  General Processing Events
`$BRO_ID` environment variable
  The `log` Module
`bro_init` event
  Filtering | Filtering | General Processing Events
`bro_log_file` variable
  Predefined Variables | The `log` Module
`$BRO_PREFIXES` environment variable
  Flags | Run-time environment
`bro_signal` event
  General Processing Events
`$BROPATH` environment variable
  Run-time environment
BS
  Predefined Functions
buffer overflow tools
  `login` variables
buffer size patch for libpcap
  Tuning BPF
buffers
  large for BPF
    Tuning BPF
buggy implementations
  causing ``weird'' events
    The `weird` Module
bugs
  `$` pattern operator not supported
    Embedded Pattern Matching
  appalling
    Additional handlers for ``weird'' | Additional handlers for ``weird''
  causing ``weird'' events
    The `weird` Module
  `tcpdump`
    Filtering
building Bro
  Building and installing Bro
`byte_len` function
  Predefined Functions
bytes in connection
  Connection summaries | Connection functions
caches
  Bro's private ones
    Flags
CALLIT portmapper call
  The `portmapper` Analyzer
can't open
  run-time error
    Run-time environment
`can_drop_connectivity` variable
  `scan` variables
`cannot create directory`
  Predefined Functions
`capture_filter` global variable
  Flags
`capture_filter` variable
  Predefined Variables | Filtering to Filtering
`\r` carriage return escape
  String Constants
casting
  not provided in Bro
    The `any` type
`cat` function
  Predefined Functions
Central Intelligence Agency
  detection
    `hot` variables
cf utility program
  no title
character set
  ASCII
    String Operators
`check_hot` function
  `hot` functions
`check_info` record
  `login` functions | `login` functions | `login` functions | `login` functions | `login` functions
  `forbidden`
    `login` functions
  `hot`
    `login` functions
  `hot_id`
    `login` functions
`check_scan` function
  `scan` functions
`check_spoof` function
  `hot` functions
checkpointing Bro
  Flags
checksum error
  ICMP
    Events handled by `conn_weird`
  IP
    Events handled by `net_weird`
  TCP
    Events handled by `conn_weird`
  UDP
    Events handled by `conn_weird`
Christmas packet
  Events handled by `conn_weird`
CIA detection
  `hot` variables
CIDR
  Net Type | Predefined Functions | Predefined Functions | Site variables
`clean` function
  Predefined Functions
cleanup event
  General Processing Events
client port
  triggering a backdoor
    `login` variables
clock time
  Predefined Functions | Predefined Functions
`close` function
  Predefined Functions
Cold Fusion exploits
  `http` variables
command shell
  Predefined Functions
  setuid root
    `login` variables
compiling Bro
  Building and installing Bro
compiling regular expressions
  Flags
completed connections
  Generic TCP connection events
compound statement
  Statements
concatenation of strings
  Predefined Functions
conditional expression
  Expressions
configuration options
  `-enable-brov6`
    The Bro source code
confused login analysis
  `login` analyzer confusion
`confused/` authentication annotation
  `login` event handlers | `login` event handlers
confusion of heuristics
  `login` analyzer confusion
`conn` analyzer
  Generic Connection Analysis
`conn_id` record
  The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record
`conn_size` function
  Connection functions
`conn_state` function
  Connection functions
`conn_stats` event
  The `analy` Analyzer
`conn_weird` event
  Events handled by `conn_weird`
`conn_weird_addl` event
  Events handled by `conn_weird_addl`
connection
  additional information
    The `connection` record | Connection summaries
  addresses
    The `connection` record | The `connection` record | Connection summaries
  analysis
    Generic Connection Analysis | The `hot` Analyzer | The `analy` Analyzer
  attempt
    Generic TCP connection events
  bytes
    The `connection` record | Connection summaries | Connection functions
  completion
    Generic TCP connection events | Generic TCP connection events
  definitions
    Definitions of connections
  detecting sensitive
    `hot` functions
  duration
    The `connection` record | Connection summaries
  establishment
    Generic TCP connection events
  events
    Generic TCP connection events
  finished
    Generic TCP connection events
  flags
    Connection summaries
  functions
    Connection functions | Connection functions
  generic analysis
    Generic Connection Analysis
  half finished
    Generic TCP connection events
  hosts
    Connection summaries
  hot
    The `connection` record | Connection functions | `login` functions | `login` functions
  hot analysis
    The `hot` Analyzer
  ICMP
    Definitions of connections
  ID
    Connection functions | Connection functions
  initiator
    The `connection` record | The `connection` record
  logging
    Connection functions
  new
    Generic TCP connection events
  non-existing
    Run-time errors for non-existing
  originator
    The `connection` record | The `connection` record
  partial
    Generic TCP connection events
  partial close
    Generic TCP connection events
  pending
    Generic TCP connection events
  ports
    The `connection` record | The `connection` record
  recording
    Connection functions
  rejected
    Generic TCP connection events
  reset
    Generic TCP connection events
  reuse
    Events handled by `conn_weird`
  sensitivity
    The `connection` record
  sequence numbers
    Predefined Functions | Predefined Functions
  service
    The `connection` record | Connection summaries | Connection functions | Connection functions
  simultaneous open
    Events handled by `conn_weird`
  size
    The `connection` record | Connection summaries | Connection functions
  start time
    The `connection` record | Connection summaries
  state
    The `connection` record | Connection summaries | Connection functions
  summaries
    Connection summaries
  TCP
    Definitions of connections
  terminating with extreme prejudice
    Connection functions
  testing for existence
    Predefined Functions
  UDP
    Definitions of connections
connection events
  TCP-specific
    Generic TCP connection events
`connection id is not a known connection`
  Predefined Functions | Run-time errors for non-existing
`connection id is not a known login connection`
  Predefined Functions | Predefined Functions
`connection` record
  The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record
connection size
  undetermined for RST termination
    `ftp` variables
connection states
  Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries | Connection summaries
  `OTH`
    Connection summaries
  `REJ`
    Connection summaries
  `RSTO`
    Connection summaries
  `RSTOS0`
    Connection summaries
  `RSTR`
    Connection summaries
  `RSTRH`
    Connection summaries
  `S0`
    Connection summaries
  `S1`
    Connection summaries
  `S2`
    Connection summaries
  `S3`
    Connection summaries
  `SF`
    Connection summaries
  `SH`
    Connection summaries
  `SHR`
    Connection summaries
connection summary files
  Connection summaries | Connection summaries
  `red`
    Connection summaries | Connection summaries
`connection_attempt` event
  Generic TCP connection events
`connection_established` event
  Generic TCP connection events | `login` event handlers
`connection_finished` event
  Generic TCP connection events
`connection_half_finished` event
  Generic TCP connection events
`connection_originator_SYN_ack` (``weird'' event)
  Events handled by `conn_weird`
`connection_partial_close` event
  Generic TCP connection events
`connection_pending` event
  Generic TCP connection events
`connection_record` function
  Predefined Functions
`connection_rejected` event
  Generic TCP connection events
`connection_reset` event
  Generic TCP connection events
connectivity
  dropping
    `scan` variables | `scan` functions
`const` statement
  Statements
`const` variable declaration
  Modifiability
constant expression
  Expressions
constant variables
  Statements
constants
  The `analy` Analyzer | The `analy` Analyzer | The `analy` Analyzer | The `analy` Analyzer
  address
    Address Constants
  boolean
    Boolean Constants
  count
    Numeric Constants
  `ENDIAN_BIG`
    The `analy` Analyzer
  `ENDIAN_CONFUSED`
    The `analy` Analyzer
  `ENDIAN_LITTLE`
    The `analy` Analyzer
  `ENDIAN_UNKNOWN`
    The `analy` Analyzer
  floating-point
    Numeric Constants
  hostname
    Address Constants
  integer
    Numeric Constants
  interval
    Temporal Constants to Temporal Constants
  net
    Net Constants
  pattern
    Pattern Constants to Pattern Constants
  port
    Port Constants
  record
    Record Constants to Record Constants
  string
    String Constants to String Constants
  temporal
    Temporal Constants
  time
    Temporal Constants to Temporal Constants
`contains_string` function
  Predefined Functions
`CONTENTS_BOTH` direction
  Predefined Functions
`CONTENTS_NONE` direction
  Predefined Functions
`CONTENTS_ORIG` direction
  Predefined Functions
`CONTENTS_RESP` direction
  Predefined Functions
control packets (SYN/FIN/RST)
  Flags | The `tcp` analyzer
`conversion of non-IPv4 address to net`
  Predefined Functions
converting an IPv6 address to net
  run-time error
    Predefined Functions
copy
  shallow vs. deep
    Record Assignment | Table Assignment
corrupted packets
  Events handled by `conn_weird` | Events handled by `net_weird`
`count`
  see types, `count`
`count` maximum
  Predefined Functions
`count` minimum
  Predefined Functions
`&create_expire` attribute
  Table Attributes
creating directories
  Predefined Functions
`creation_time`
  The `dns_mapping` record
  `dns_mapping` field
    The `dns_mapping` record
crud
  Generic TCP connection events | The `weird` Module
`current_time` function
  Predefined Functions
`d` format
  Predefined Functions | Predefined Functions
`daemon` username
  The `hot-ids` Module | `ident` variables
daemons
  as innocuous user names
    `ident` variables
data
  unanalyzed
    Events handled by `conn_weird`
`data_after_reset` (``weird'' event)
  Events handled by `conn_weird`
`data_before_established` (``weird'' event)
  Events handled by `conn_weird`
`day` interval unit
  Temporal Constants
debugging
  filtering problems
    Filtering
decrement expressions
  Expressions
deep copy
  Record Assignment | Table Assignment
default
  filtering
    Filtering
`&default` attribute
  Table Attributes
default values
  Table Attributes
DEL
  Predefined Functions | Predefined Functions
delete character
  Predefined Functions
`delete` keyword
  Statements
`delete` statement
  Statements
`&delete_func` attribute
  Refinement
`demux` module
  The `demux` Module
`demux_conn` function
  The `demux` Module
denial of service
  excessively large fragments
    Events handled by `flow_weird`
  Land attack
    Events generated by the
detecting scans
  The `scan` Analyzer
detecting sensitive connections
  `hot` functions
`determine_service` function
  Connection functions
/dev/bpf
  Tuning BPF
`direct_login_prompts` variable
  Predefined Variables | `login` variables
directions
  Predefined Functions | Predefined Functions | Predefined Functions | Predefined Functions
  `CONTENTS_BOTH`
    Predefined Functions
  `CONTENTS_NONE`
    Predefined Functions
  `CONTENTS_ORIG`
    Predefined Functions
  `CONTENTS_RESP`
    Predefined Functions
directories
  creating
    Predefined Functions
directory names
  sensitive
    `login` variables
`discarder_check_icmp` function
  Predefined Functions
`discarder_check_ip` function
  Predefined Functions
`discarder_check_tcp` function
  Predefined Functions
`discarder_check_udp` function
  Predefined Functions
`discarder_maxlen` variable
  Predefined Variables
diverse network use
  causing ``weird'' events
    The `weird` Module
division
  numeric
    Arithmetic Operators
  temporal
    Temporal Division
DMZ
  spoof detection
    `hot` variables
DNS
  Bro's private cache
    The `dns` Module
    forcing access to
      Flags
  mappings
    The `dns_mapping` record
DNS lookups
  non-blocking
    The Bro source code
`dns` module
  The `dns` Module
`dns_interesting_changes` variable
  `dns` variables
`dns_mapping` record
  no title | The `dns_mapping` record | The `dns_mapping` record | The `dns_mapping` record | The `dns_mapping` record | The `dns_mapping` record | The `dns_mapping` record | The `dns_mapping` record | The `dns_mapping` record
`dns_mapping_altered` event
  `dns` event handlers
`dns_mapping_lost_name` event
  `dns` event handlers
`dns_mapping_name_changed` event
  `dns` event handlers
`dns_mapping_new_name` event
  `dns` event handlers
`dns_mapping_unverified` event
  `dns` event handlers
`dns_mapping_valid` event
  `dns` event handlers
`done_with_network` global variable
  Expressions
`done_with_network` variable
  Predefined Variables
dotted quads
  The hf utility
`double`
  see types, `double`
`double` maximum
  Predefined Functions
`double` minimum
  Predefined Functions
drop-connectivity shell script
  `scan` functions
`drop_address` function
  `scan` functions
dropping connectivity
  `scan` variables | `scan` functions
DUMP portmapper call
  The `portmapper` Analyzer
`duration`
  The `connection` record
  `connection` field
    The `connection` record
duration of a connection
  The `connection` record | Connection summaries
dynamic defaults
  Table Attributes
`e` format
  Predefined Functions
`edit` function
  Predefined Functions
`edit_and_check_line` function
  `login` functions
`edit_and_check_password` function
  `login` functions
`edit_and_check_user` function
  `login` functions
`edited_input_trouble` variable
  `login` variables
editing
  Predefined Functions
`eggdrop` sensitive filename
  `ftp` variables
`eggdrop` sensitive login input
  `login` variables
`eject` exploit
  `login` variables
`else` keyword
  Statements
embedded NUL
  run-time error
    Run-time errors for strings
`-enable-brov6` configuration option
  The Bro source code
encrypted login sessions
  `login` event handlers
encryption
  leading to ``excessive lines''
    `login` event handlers
endian issues
  Predefined Functions | The `analy` Analyzer
`ENDIAN_BIG` constant
  The `analy` Analyzer
`ENDIAN_CONFUSED` constant
  The `analy` Analyzer
`ENDIAN_LITTLE` constant
  The `analy` Analyzer
`endian_type` statistic
  The `analy` Analyzer
`ENDIAN_UNKNOWN` constant
  The `analy` Analyzer
`endpoint` record
  The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | Connection summaries
`endpoint_id` function
  The `port-name` Module
`enum`
  see types, `enum` | see types, `enum`
enumerations
  Enumerations to Enumerations
environment
  accessing
    Predefined Functions
  responder
    `login` analyzer confusion
  Telnet options
    `login` analyzer confusion
environment variables
  `$BRO_ID`
    The `log` Module
  `$BRO_PREFIXES`
    Flags | Run-time environment
  `$BROPATH`
    Run-time environment
  `$USER`
    `login` analyzer confusion
ephemeral port
  Connection functions
  triggering a backdoor
    `login` variables
ephemeral ports
  confused with sensitive services
    `hot` variables
equality expression
  Expressions
escape sequences
  String Constants
established connections
  Generic TCP connection events
/etc/inetd.conf
  `hot` variables
/etc/passwd
  `http` variables
/etc/shadow
  `http` variables
evasion
  authentication dialog
    The `login` Analyzer | `login` analyzer confusion
  excessively small fragments
    Events handled by `flow_weird`
  inconsistent fragment size
    Events handled by `flow_weird`
  inconsistent fragments
    Events handled by `flow_weird`
  inconsistent RPC retransmission
    Events handled by `conn_weird`
  inconsistent TCP retransmission
    Additional handlers for ``weird''
  inserting NULs
    String Constants
  length mismatch
    Events handled by `conn_weird`
  using tunneling
    `login` event handlers
`event`
  see types, `event`
event engine
  Event handlers
event handler
  invocation
    Event handlers
event handlers
  Event handlers to Event handlers
event handling
  weird
    Events handled by `conn_weird` to Additional handlers for ``weird''
`event` keyword
  Statements
event scheduling expression
  Expressions
`event` statement
  Statements
event type
  Event handlers to Event handlers
events
  `bro_init`
    Filtering | Filtering
  `bro_init`
    General Processing Events
  `net_done`
    General Processing Events
  `bro_done`
    General Processing Events
  `bro_signal`
    General Processing Events
  `net_stats_update`
    General Processing Events
  `ack_above_hole`
    General Processing Events
  `new_connection`
    Generic TCP connection events
  `connection_established`
    Generic TCP connection events
  `connection_attempt`
    Generic TCP connection events
  `partial_connection`
    Generic TCP connection events
  `connection_finished`
    Generic TCP connection events
  `connection_rejected`
    Generic TCP connection events
  `connection_half_finished`
    Generic TCP connection events
  `connection_reset`
    Generic TCP connection events
  `connection_partial_close`
    Generic TCP connection events
  `connection_pending`
    Generic TCP connection events
  `udp_request`
    The `udp` analyzer
  `udp_reply`
    The `udp` analyzer
  `account_tried`
    `scan` event handlers
  `dns_mapping_valid`
    `dns` event handlers
  `dns_mapping_unverified`
    `dns` event handlers
  `dns_mapping_new_name`
    `dns` event handlers
  `dns_mapping_lost_name`
    `dns` event handlers
  `dns_mapping_name_changed`
    `dns` event handlers
  `dns_mapping_altered`
    `dns` event handlers
  `finger_request`
    `finger` event handlers
  `finger_reply`
    `finger` event handlers
  `ftp_request`
    `ftp` event handlers
  `ftp_reply`
    `ftp` event handlers
  `http_request`
    `http` event handlers
  `ident_request`
    `ident` event handlers
  `ident_reply`
    `ident` event handlers
  `ident_error`
    `ident` event handlers
  `login_failure`
    `login` event handlers
  `login_success`
    `login` event handlers
  `login_input_line`
    `login` event handlers
  `login_output_line`
    `login` event handlers
  `login_confused`
    `login` event handlers
  `login_confused_text`
    `login` event handlers
  `login_terminal`
    `login` event handlers
  `excessive_line`
    `login` event handlers
  `inconsistent_option`
    `login` event handlers
  `bad_option`
    `login` event handlers
  `bad_option_termination`
    `login` event handlers
  `authentication_accepted`
    `login` event handlers
  `authentication_rejected`
    `login` event handlers
  `authentication_skipped`
    `login` event handlers
  `connection_established`
    `login` event handlers
  `partial_connection`
    `login` event handlers
  `activating_encryption`
    `login` event handlers
  `pm_request_null`
    `portmapper` event handlers
  `pm_request_set`
    `portmapper` event handlers
  `pm_request_unset`
    `portmapper` event handlers
  `pm_request_getport`
    `portmapper` event handlers
  `pm_request_dump`
    `portmapper` event handlers
  `pm_request_callit`
    `portmapper` event handlers
  `pm_attempt_null`
    `portmapper` event handlers
  `pm_attempt_set`
    `portmapper` event handlers
  `pm_attempt_unset`
    `portmapper` event handlers
  `pm_attempt_getport`
    `portmapper` event handlers
  `pm_attempt_dump`
    `portmapper` event handlers
  `pm_attempt_callit`
    `portmapper` event handlers
  `pm_bad_port`
    `portmapper` event handlers
  `conn_stats`
    The `analy` Analyzer
  `conn_weird`
    Events handled by `conn_weird`
  `conn_weird_addl`
    Events handled by `conn_weird_addl`
  `flow_weird`
    Events handled by `flow_weird`
  `net_weird`
    Events handled by `net_weird`
  `rexmit_inconsistency`
    Additional handlers for ``weird''
  `ack_above_hole`
    Additional handlers for ``weird''
  exceptional
    The `weird` Module to Additional handlers for ``weird''
  finish
    General Processing Events | General Processing Events
  general Bro processing
    General Processing Events
  generic TCP connection
    Generic TCP connection events
  initialization
    General Processing Events
  scheduling
    Expressions
  startup
    General Processing Events
  termination
    General Processing Events | General Processing Events
exceptional events
  The `weird` Module to Additional handlers for ``weird''
`excess_RPC` (``weird'' event)
  Events handled by `conn_weird`
`excessive_line` event
  `login` event handlers
`excessive_RPC_len` (``weird'' event)
  Events handled by `conn_weird`
`excessive_typeahead` (login confusion state)
  `login` analyzer confusion
excessively long lines
  `login` event handlers
`excessively_large_fragment` (``weird'' event)
  Events handled by `flow_weird`
`excessively_small_fragment` (``weird'' event)
  Events handled by `flow_weird`
excluding hosts
  Filtering
executables
  running
    Predefined Functions
`exit` function
  Predefined Functions
`expanded_line`
  `login` functions
  `check_info` field
    `login` functions
expiration
  timer
    Expressions | Predefined Variables
`&expire_func` attribute
  Table Attributes
explicit typing
  Typing
exploit tools
  `login` variables
  `smashdu.c`
    `login` variables
exploits
  `login` variables | `login` variables | `login` variables
  `/bin/eject`
    `login` variables
  buffer overflow
    `login` variables
  `eject`
    `login` variables
  `loadmodule`
    `login` variables
  Unix
    `login` variables
expression statement
  Statements
expressions
  Expressions to Expressions
  parenthesized
    Expressions
  constant
    Expressions
  variable
    Expressions
  increment
    Expressions
  decrement
    Expressions
  negation
    Expressions
  positivation
    Expressions
  arithmetic
    Expressions
  logical
    Expressions
  equality
    Expressions
  relational
    Expressions
  conditional
    Expressions
  assignment
    Expressions
  function call
    Expressions
  anonymous function
    Expressions
  event scheduling
    Expressions
  index
    Expressions
  membership
    Expressions
  pattern matching
    Expressions
  record field access
    Expressions
  record constructor
    Expressions
  record field test
    Expressions
`extra_repeat_text` (login confusion state)
  `login` analyzer confusion
`EZsetup` username
  The `hot-ids` Module
`-F` flag
  Flags | Flags
`f` format
  Predefined Functions
failure of heuristics
  `login` analyzer confusion
fatal run-time error
  non-existing connection
    Predefined Functions
fetch utility
  `login` variables
fflush
  Predefined Functions
field attributes
  Record Assignment
`\f` formfeed escape
  String Constants
`file`
  see types, `file`
file type
  Files to Files
filenames
  sensitive
    `ftp` variables | `login` variables
files
  appending
    Predefined Functions
  opening
    Predefined Functions | Predefined Functions
  testing if open
    Predefined Functions
filtering
  default
    Filtering
filters
  Filtering to Filtering
  displaying
    Filtering
  errors
    Filtering
FIN control packet
  Flags | The `tcp` analyzer
`FIN_advanced_last_seq` (``weird'' event)
  Events handled by `conn_weird`
`FIN_after_reset` (``weird'' event)
  Events handled by `conn_weird`
`FIN_storm` (``weird'' event)
  Events handled by `conn_weird`
Finger
  analysis
    The `finger` Analyzer
  weird events
    Events handled by `conn_weird`
`finger` analyzer
  The `finger` Analyzer
`finger_reply` event
  `finger` event handlers
`finger_request` event
  `finger` event handlers
finish event
  General Processing Events | General Processing Events
firewall
  reactive
    `scan` variables | `scan` functions
`flag_rejected_service` variable
  `hot` variables
`flag_successful_inbound_service` variable
  `hot` variables
`flag_successful_service` variable
  `hot` variables
flags
  `-P`
    The `dns` Module
  `-f`
    Flags
  `-h`
    Flags
  `-i`
    Flags
  `-p`
    Flags
  `-r`
    Flags
  `-w`
    Flags
  `-v`
    Flags
  `-F`
    Flags
  `-O`
    Flags
  `-P`
    Flags
  `-W`
    Flags
flags of connection
  Connection summaries
flex utility
  Pattern Constants
`flow_weird` event
  Events handled by `flow_weird`
`flush_all` function
  Predefined Functions
`fmt` function
  Predefined Functions
`for` keyword
  Statements
`for` statement
  Statements
`forbidden check_info` record
  `login` functions
`forbidden_id_patterns` variable
  The `hot-ids` Module
`forbidden_ids` variable
  The `hot-ids` Module
`forbidden_ids_if_no_password` variable
  The `hot-ids` Module
forcing access to Bro's private DNS cache
  Flags
format
  ``%``
    Predefined Functions
  `d`
    Predefined Functions | Predefined Functions
  `e`
    Predefined Functions
  `f`
    Predefined Functions
  `g`
    Predefined Functions
  precision
    Predefined Functions
  width
    Predefined Functions
formatting text
  Predefined Functions
`.forward`
  `ftp` variables
`frag` module
  The `frag` Module
fragment reassembly
  The `frag` Module
`fragment_inconsistency` (``weird'' event)
  Events handled by `flow_weird`
`fragment_overlap` (``weird'' event)
  Events handled by `flow_weird`
`fragment_protocol_inconsistency` (``weird'' event)
  Events handled by `flow_weird`
`fragment_size_inconsistency` (``weird'' event)
  Events handled by `flow_weird`
`fragment_with_DF` (``weird'' event)
  Events handled by `flow_weird`
fragments
  excessively large
    Events handled by `flow_weird`
  excessively small
    Events handled by `flow_weird`
  inconsistent
    Events handled by `flow_weird`
  inconsistent protocols
    Events handled by `flow_weird`
  inconsistent sizes
    Events handled by `flow_weird`
  overlapping
    Events handled by `flow_weird`
  TCP vs. UDP
    The `frag` Module
frogs
  dissecting
    `http` variables
FTP
  analysis
    The `ftp` Analyzer
  ephemeral ports confused with sensitive services
    `hot` variables
  log file
    `ftp` variables
  session information
    The `ftp_session_info` record
  weird events
    Events handled by `conn_weird`
`ftp` analyzer
  The `ftp` Analyzer
`ftp` session summary file
  `ftp` variables
`ftp_guest_ids` variable
  `ftp` variables
`ftp_hot_files` variable
  `ftp` variables
`ftp_hot_guest_files` variable
  `ftp` variables
`ftp_not_actually_hot_files` variable
  `ftp` variables
`ftp_port` record
  Predefined Functions | Predefined Functions
`ftp_reply` event
  `ftp` event handlers
`ftp_request` event
  `ftp` event handlers
`ftp_session_info` record
  no title | The `ftp_session_info` record | The `ftp_session_info` record | The `ftp_session_info` record | The `ftp_session_info` record | The `ftp_session_info` record | The `ftp_session_info` record | The `ftp_session_info` record | The `ftp_session_info` record | The `ftp_session_info` record
`ftp_skip_hot` variable
  `ftp` variables
`full_id_string` function
  Connection functions
`function`
  see types, `function`
function call expression
  Expressions
function invocation
  Expressions
`function` keyword
  Expressions
function type
  Functions to Functions
functions
  Functions to Functions
  `active_connection`
    Predefined Functions
  `active_file`
    Predefined Functions
  `add_interface`
    Predefined Functions
  `add_tcpdump_filter`
    Predefined Functions
  `log_hook`
    Predefined Functions
  `byte_len`
    Predefined Functions
  `cat`
    Predefined Functions
  `clean`
    Predefined Functions
  `close`
    Predefined Functions
  `connection_record`
    Predefined Functions
  `contains_string`
    Predefined Functions
  `current_time`
    Predefined Functions
  `discarder_check_icmp`
    Predefined Functions
  `discarder_check_ip`
    Predefined Functions
  `discarder_check_tcp`
    Predefined Functions
  `discarder_check_udp`
    Predefined Functions
  `edit`
    Predefined Functions
  `exit`
    Predefined Functions
  `flush_all`
    Predefined Functions
  `fmt`
    Predefined Functions
  `get_login_state`
    Predefined Functions
  `get_orig_seq`
    Predefined Functions
  `get_resp_seq`
    Predefined Functions
  `getenv`
    Predefined Functions
  `is_tcp_port`
    Predefined Functions
  `length`
    Predefined Functions
  `log_file_name`
    Predefined Functions
  `mask_addr`
    Predefined Functions
  `max_count`
    Predefined Functions
  `max_double`
    Predefined Functions
  `max_interval`
    Predefined Functions
  `min_count`
    Predefined Functions
  `min_double`
    Predefined Functions
  `min_interval`
    Predefined Functions
  `mkdir`
    Predefined Functions
  `network_time`
    Predefined Functions
  `open`
    Predefined Functions
  `open_for_append`
    Predefined Functions
  `open_log_file`
    Predefined Functions
  `parse_ftp_pasv`
    Predefined Functions
  `parse_ftp_port`
    Predefined Functions
  `reading_live_traffic`
    Predefined Functions
  `set_buf`
    Predefined Functions
  `set_contents_file`
    Predefined Functions
  `set_login_state`
    Predefined Functions
  `set_record_packets`
    Predefined Functions
  `skip_further_processing`
    Predefined Functions
  `sub_bytes`
    Predefined Functions
  `system`
    Predefined Functions
  `to_lower`
    Predefined Functions
  `to_net`
    Predefined Functions
  `to_upper`
    Predefined Functions
  `conn_size`
    Connection functions
  `conn_state`
    Connection functions
  `determine_service`
    Connection functions
  `full_id_string`
    Connection functions
  `id_string`
    Connection functions
  `log_hot_conn`
    Connection functions
  `record_connection`
    Connection functions
  `service_name`
    Connection functions
  `terminate_connection`
    Connection functions
  `is_local_addr`
    Site-specific functions
  `check_spoof`
    `hot` functions
  `check_hot`
    `hot` functions
  `drop_address`
    `scan` functions
  `check_scan`
    `scan` functions
  `endpoint_id`
    The `port-name` Module
  `log_hook`
    The `log` Module | The `log` Module
  `log_hook`
    The `log` Module
  `demux_conn`
    The `demux` Module
  `is_ftp_data_conn`
    `ftp` functions
  `is_login_conn`
    `login` functions
  `hot_login`
    `login` functions
  `is_hot_id`
    `login` functions
  `is_forbidden_id`
    `login` functions
  `edit_and_check_line`
    `login` functions
  `edit_and_check_user`
    `login` functions
  `edit_and_check_password`
    `login` functions
  `rpc_prog`
    `portmapper` functions
  `pm_check_getport`
    `portmapper` functions
  `pm_activity`
    `portmapper` functions
  `pm_request`
    `portmapper` functions
  `pm_attempt`
    `portmapper` functions
  `report_weird`
    `weird` functions
  `report_weird_conn`
    `weird` functions
  `report_weird_orig`
    `weird` functions
  `open`
    Files
  `open_for_append`
    Files
  anonymous
    Expressions
  redefining
    Functions
  site-specific
    Site-specific functions
`g` format
  Predefined Functions
`garbage args` (RPC status code)
  `portmapper` functions
general Bro processing events
  General Processing Events
general scripting
  Predefined Functions
generic connection analysis
  Generic Connection Analysis
`GET` HTTP method
  `http` variables
`get_login_state` function
  Predefined Functions
`get_orig_seq` function
  Predefined Functions
`get_resp_seq` function
  Predefined Functions
`getenv` function
  Predefined Functions
GETPORT portmapper call
  The `portmapper` Analyzer
global scope
  of enumerations
    Enumerations
`global` variable declaration
  Scope
global variables
  Scope
  `interfaces`
    Live traffic
  `capture_filter`
    Flags
  `restrict_filter`
    Flags
  `interfaces`
    Flags
  `done_with_network`
    Expressions
`-h` flag
  Flags
half-finished connections
  Generic TCP connection events
handling signals
  General Processing Events
`HEAD` HTTP method
  `http` variables
headers
  truncated
    Events handled by `net_weird`
help message
  Flags
heuristics
  attacker-induced confusion
    `login` analyzer confusion
  confusion
    `login` analyzer confusion
  environment
    `login` analyzer confusion
  extracting username information
    The `login` Analyzer | `login` analyzer confusion
  missing login prompt
    `login` analyzer confusion
  missing username
    `login` analyzer confusion | `login` analyzer confusion
  multiple login prompts
    `login` analyzer confusion | `login` analyzer confusion
  multiple usernames
    `login` analyzer confusion
  type-ahead
    `login` analyzer confusion
  VMS
    `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion
`\x`hex-digits hexadecimal escape
  String Constants
hf utility program
  no title
host order (vs. network order)
  Predefined Functions
`hostname`
  The `dns_mapping` record
  `dns_mapping` field
    The `dns_mapping` record
hostnames
  Address Constants
  mapping addresses to
    The hf utility
hosts
  excluding
    Filtering
  in a connection
    Connection summaries
`hot`
  The `connection` record
  `connection` field
    The `connection` record
hot /24 destination networks
  `hot` variables
hot /24 source networks
  `hot` variables
`hot` analyzer
  The `hot` Analyzer
`hot check_info` record
  `login` functions
hot connection
  analysis
    The `hot` Analyzer
  logging
    Connection functions
hot connections
  `login` functions | `login` functions
hot destination addresses
  `hot` variables
hot detection
  `hot` functions
hot source addresses
  `hot` variables
hot usernames
  The `hot-ids` Module
`hot-ids` module
  The `hot-ids` Module
`hot_dst_24nets` variable
  `hot` variables
`hot_dsts` variable
  `hot` variables
`hot_id check_info` record
  `login` functions
`hot_ident_exceptions` variable
  `ident` variables
`hot_ident_ids` variable
  `ident` variables
`hot_ids` variable
  The `hot-ids` Module
`hot_login` function
  `login` functions
`hot_login_ids` variable
  `login` variables
`hot_names` variable
  `finger` variables
`hot_src_24nets` variable
  `hot` variables
`hot_srcs` variable
  `hot` variables
`hot_ssh_orig_ports` variable
  `login` variables
`hot_telnet_orig_ports` variable
  `login` variables
`hot_terminal_types` variable
  `login` variables
`hr` (hours) interval unit
  Temporal Constants
HTTP
  analysis
    The `http` Analyzer
  log file
    `http` variables
  weird events
    Events handled by `conn_weird`
`http` analyzer
  The `http` Analyzer
HTTP methods
  `http` variables | `http` variables | `http` variables | `http` variables
  `GET`
    `http` variables
  `HEAD`
    `http` variables
  `POST`
    `http` variables
HTTP packets
  contents not being recorded
    Flags
`http` session summary file
  `http` variables
`http_request` event
  `http` event handlers
`HTTP_unknown_method` (``weird'' event)
  Events handled by `conn_weird`
`HTTP_version_mismatch` (``weird'' event)
  Events handled by `conn_weird`
HUP signal
  General Processing Events
`-i` flag
  Flags
ICMP
  checksum error
    Events handled by `conn_weird`
  connections
    Definitions of connections
  timeout
    Definitions of connections
  weird events
    Events handled by `conn_weird`
`id`
  The `connection` record | The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
ID of connection
  Connection functions | Connection functions
`id_string` function
  Connection functions
IDENT
  analysis
    The `ident` Analyzer
  weird events
    Events handled by `conn_weird_addl`
`ident` analyzer
  The `ident` Analyzer
`ident/` authentication annotation
  `ident` event handlers
`ident_error` event
  `ident` event handlers
`ident_reply` event
  `ident` event handlers
`ident_request` event
  `ident` event handlers
`ident_request_addendum` (``weird'' event)
  Events handled by `conn_weird_addl`
IEUser
  useless FTP username
    `ftp` variables
`if` keyword
  Statements
`if` statement
  Statements
implicit typing
  Typing
`in` operator
  Embedded Pattern Matching | Expressions | Expressions
in-order delivery
  The `analy` Analyzer
`"!in` negation of `in` operator
  Embedded Pattern Matching
`inappropriate_FIN` (``weird'' event)
  Events handled by `conn_weird`
inbound services
  fatal
    `hot` variables
  forbidden
    `hot` variables
`incompletely_captured_fragment` (``weird'' event)
  Events handled by `flow_weird`
inconsistent acknowledgment
  Additional handlers for ``weird''
inconsistent retransmission
  Events handled by `conn_weird` | Additional handlers for ``weird''
`inconsistent_option` event
  `login` event handlers
increment expressions
  Expressions
index
  of a table
    Tables
index expression
  Expressions
inetd.conf
  `hot` variables
inferring types
  Typing
information associated with a connection
  The `connection` record | Connection summaries
`ingreslock` popular backdoor
  `hot` variables
initialization event
  General Processing Events
initialization of variables
  Initialization
input
  analysis
    The `login` Analyzer
  editing
    `login` variables
`input_trouble` variable
  `login` variables
installing Bro
  Installing Bro
`int`
  see types, `int`
INT signal
  General Processing Events
integers
  network vs. host order
    Predefined Functions
`interfaces` global variable
  Live traffic | Flags
`interfaces` variable
  Predefined Variables
internal networks
  spoof detection
    `hot` variables
internal variables
  `ATTEMPT_INTERVAL`
    Generic TCP connection events
  `PARTIAL_CLOSE_INTERVAL`
    Generic TCP connection events
  `WATCHDOG_INTERVAL`
    Flags
`internally_truncated_header` (``weird'' event)
  Events handled by `net_weird`
Internet Relay Chat (IRC)
  attacker subpopulation
    `login` variables
`interval`
  see types, `interval`
`interval` maximum
  Predefined Functions
`interval` minimum
  Predefined Functions
interval units
  `usec`
    Temporal Constants
  `sec`
    Temporal Constants
  `min`
    Temporal Constants
  `hr`
    Temporal Constants
  `day`
    Temporal Constants
invocation
  function
    Expressions
invoking event handlers
  Event handlers
IP
  checksum error
    Events handled by `net_weird`
  fragments
    Events handled by `flow_weird`
  identification field
    The `analy` Analyzer
  weird events
    Events handled by `net_weird`
IPv4/IPv6 address constants
  Address Constants
IPv6 and lack of CIDR prefixes
  Net Type
IPv6 support
  Address Type
IRC
  `login` variables
`is not a TCP connection`
  Predefined Functions | Predefined Functions
`is_forbidden_id` function
  `login` functions
`is_ftp_data_conn` function
  `ftp` functions
`is_hot_id` function
  `login` functions
`is_local_addr` function
  Site-specific functions
`is_login_conn` function
  `login` functions
`is_tcp_port` function
  Predefined Functions
isascii
  Predefined Functions | Predefined Functions
islower
  Predefined Functions
isupper
  Predefined Functions
keystrokes
  analysis
    The `login` Analyzer
  editing
    `login` variables
keywords
  `print`
    Statements
  `log`
    Statements
  `event`
    Statements
  `if`
    Statements
  `else`
    Statements
  `for`
    Statements
  `next`
    Statements
  `break`
    Statements
  `return`
    Statements
  `add`
    Statements
  `delete`
    Statements
  `function`
    Expressions
  `schedule`
    Expressions
kiddies
  script
    `hot` variables
Land attack
  `hot` functions | Events generated by the
`Land_attack` (``weird'' event)
  Events generated by the
large BPF buffers
  Tuning BPF
`(` operator
  Expressions | Expressions
length
  of strings
    Predefined Functions
  of table or set
    Predefined Functions
`length` function
  Predefined Functions
length mismatch
  UDP
    Events handled by `conn_weird`
`length() requires a table/set argument`
  Predefined Functions
`length() takes exactly one argument`
  Predefined Functions
lex utility
  Pattern Constants
libpcap buffer size patch
  Tuning BPF
libpcap library
  Tuning BPF
libraries
  libpcap
    Tuning BPF
  libpcap
    Tuning BPF
line editing
  Predefined Functions
Linux
  compiling Bro under
    The Bro source code
  super exploit
    `login` variables
little endian
  Predefined Functions | The `analy` Analyzer
live traffic
  Statements | Predefined Functions
load
  shedding
    Predefined Functions
`loadmodule` exploit
  `login` variables
local addresses
  Site variables | Site variables | Site variables | Site-specific functions
  spoofing
    `hot` variables | `hot` variables | `hot` functions
`local` statement
  Statements
`local` variable declaration
  Scope
local variables
  Statements | Scope
`local_16_nets` variable
  Site variables
`local_24_nets` variable
  Site variables
`local_nets` variable
  Site variables
log file
  Predefined Variables | Predefined Functions | The `log` Module
  altering
    `login` variables
  connection summary (`red`)
    Connection functions
  FTP
    `ftp` variables
  HTTP
    `http` variables
  weird events
    The `weird` Module
`log` keyword
  Statements
`log` module
  The `log` Module
`log` statement
  Statements
`log_file_name` function
  Predefined Functions
`log_hook` function
  The `log` Module | The `log` Module | The `log` Module
`log_hook` predefined function
  Predefined Functions
`log_hot_conn` function
  Connection functions
`log_if_not_denied`
  The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
`log_if_not_unavail`
  The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
`log_it`
  The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
`LOG_NOTICE` syslog level
  Statements
logging
  connection
    Connection functions
  control of
    Predefined Functions
logical expression
  Expressions
logical negation
  Logical Operators
login analysis
  confusion
    `login` analyzer confusion
`login` analyzer
  The `login` Analyzer
login confusion states
  `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion
  `excessive_typeahead`
    `login` analyzer confusion
  `extra_repeat_text`
    `login` analyzer confusion
  `multiple_login_prompts`
    `login` analyzer confusion
  `multiple_USERs`
    `login` analyzer confusion
  `no_login_prompt`
    `login` analyzer confusion
  `no_username`
    `login` analyzer confusion
  `no_username2`
    `login` analyzer confusion
  `non_empty_multi_login`
    `login` analyzer confusion
  `possible_login_ploy`
    `login` analyzer confusion
  `repeat_without_username`
    `login` analyzer confusion
  `responder_environment`
    `login` analyzer confusion
  `username_with_embedded_repeat`
    `login` analyzer confusion
login prompts
  missing
    `login` analyzer confusion
  repeated
    `login` analyzer confusion | `login` analyzer confusion
login session
  The `login` Analyzer
  state
    Predefined Functions | Predefined Functions
`login_confused` event
  `login` event handlers
`login_confused_text` event
  `login` event handlers
`login_failure` event
  `login` event handlers
`login_failure_msgs` variable
  Predefined Variables | `login` variables
`login_input_line` event
  `login` event handlers
`login_non_failure_msgs` variable
  Predefined Variables | `login` variables
`login_output_line` event
  `login` event handlers
`login_prompts` variable
  Predefined Variables | `login` variables
`LOGIN_STATE_AUTHENTICATE` state of login connection
  Predefined Functions
`LOGIN_STATE_CONFUSED` state of login connection
  Predefined Functions
`LOGIN_STATE_LOGGED_IN` state of login connection
  Predefined Functions
`LOGIN_STATE_SKIP` state of login connection
  Predefined Functions
`login_success` event
  `login` event handlers
`login_success_msgs` variable
  Predefined Variables | `login` variables
`login_terminal` event
  `login` event handlers
`login_timeouts` variable
  Predefined Variables | `login` variables
ls utility
  `login` variables
lynx utility
  `login` variables
magic terminal types
  `login` variables
management
  of state
    Table Attributes
`mask_addr` function
  Predefined Functions
masking
  Predefined Functions | Predefined Functions
`max_count` function
  Predefined Functions
`max_double` function
  Predefined Functions
`max_interval` function
  Predefined Functions
`max_request_length` variable
  `finger` variables
`max_timer_expires` variable
  Predefined Variables
maximum
  Predefined Functions
Maximum Segment Lifetime (MSL)
  Events handled by `conn_weird`
maximums
  Predefined Functions | Predefined Functions | Predefined Functions
  `count`
    Predefined Functions
  `double`
    Predefined Functions
  `interval`
    Predefined Functions
membership expression
  Expressions
memory management
  Table Attributes
message
  `connection id is not a known connection`
    Predefined Functions
  `not exactly one edit character`
    Predefined Functions
  `precision specified for non-floating point format`
    Predefined Functions
  `ridiculous field width or precision`
    Predefined Functions
  `bad format`
    Predefined Functions
  `bad type for Date format`
    Predefined Functions
  `bad type for integer format`
    Predefined Functions
  `bad type for floating-point format`
    Predefined Functions
  `wrong number of fmt arguments`
    Predefined Functions
  `too many arguments for format`
    Predefined Functions
  `too few arguments for format`
    Predefined Functions
  `connection id is not a known login connection`
    Predefined Functions
  `is not a TCP connection`
    Predefined Functions
  `is not a TCP connection`
    Predefined Functions
  `length() takes exactly one argument`
    Predefined Functions
  `length() requires a table/set argument`
    Predefined Functions
  `bad second argument to mask_addr()`
    Predefined Functions
  `cannot create directory`
    Predefined Functions
  `connection id is not a known login connection`
    Predefined Functions
  `conversion of non-IPv4 address to net`
    Predefined Functions
  `connection id is not a known connection`
    Run-time errors for non-existing
  `string without NUL terminator`
    Run-time errors for strings
  `string with embedded NUL`
    Run-time errors for strings
`min` (minutes) interval unit
  Temporal Constants
`min_count` function
  Predefined Functions
`min_double` function
  Predefined Functions
`min_interval` function
  Predefined Functions
minimum
  Predefined Functions
minimums
  Predefined Functions | Predefined Functions | Predefined Functions
  `count`
    Predefined Functions
  `double`
    Predefined Functions
  `interval`
    Predefined Functions
`mismatch` (RPC status code)
  `portmapper` functions
missing login prompts
  `login` analyzer confusion
missing username
  `login` analyzer confusion | `login` analyzer confusion
mkdir failure
  run-time error
    Predefined Functions
`mkdir` function
  Predefined Functions
modifiability of variables
  Modifiability
modules
  `port-name`
    The `port-name` Module
  `mt`
    The `mt` Module
  `log`
    The `log` Module
  `active`
    The `active` Module
  `demux`
    The `demux` Module
  `dns`
    The `dns` Module
  `frag`
    The `frag` Module
  `hot-ids`
    The `hot-ids` Module
  `weird`
    The `weird` Module
  dns
    event handlers
      `dns` event handlers to `dns` event handlers
    variables
      `dns` variables to `dns` variables
MSL (Maximum Segment Lifetime)
  Events handled by `conn_weird`
`mt` module
  The `mt` Module
multi-dimensional table
  Declaring Tables
multiple login prompts
  `login` analyzer confusion | `login` analyzer confusion
multiple usernames
  `login` analyzer confusion
`multiple_HTTP_request_elements` (``weird'' event)
  Events handled by `conn_weird`
`multiple_login_prompts` (login confusion state)
  `login` analyzer confusion
`multiple_RPCs` (``weird'' event)
  Events handled by `conn_weird`
`multiple_USERs` (login confusion state)
  `login` analyzer confusion
multiplication
  numeric
    Arithmetic Operators
  temporal
    Temporal Multiplication
name
  of log file
    Predefined Functions
names
  case-sensitive
    Defining records
Napster
  tunneled over Telnet or Rlogin
    `login` event handlers
negation
  logical
    Logical Operators
  temporal
    Temporal Negation
negation expression
  Expressions
neighbor addresses
  Site variables | Site variables | Site variables
`neighbor_16_nets` variable
  Site variables
`neighbor_24_nets` variable
  Site variables
`neighbor_nets` variable
  Site variables
`net`
  see types, `net`
  constants
    Net Constants
  operators
    Net Operators
net type
  Net Type to Net Operators
`net_done` event
  General Processing Events
`net_stats` record
  General Processing Events | General Processing Events
`net_stats_update` event
  General Processing Events
`net_weird` event
  Events handled by `net_weird`
network cleanup event
  General Processing Events
Network File System (NFS)
  `portmapper` variables
network interfaces
  Live traffic | Flags | Predefined Variables
network order (vs. host order)
  Predefined Functions
network prefixes
  Net Type | Predefined Functions | Site variables | Site variables
network statistics
  General Processing Events
Network Virtual Terminal (NVT)
  `login` event handlers
`network_time` function
  Predefined Functions
networks
  hot destinations
    `hot` variables
  hot sources
    `hot` variables
`never_shut_down` variable
  `scan` variables
new connection
  Generic TCP connection events
`new_connection` event
  Generic TCP connection events
`\n` newline escape
  String Constants
`next` keyword
  Statements
`next` statement
  Statements
NFS (Network File System)
  `portmapper` variables
NFS traffic
  high volume fragments
    The `frag` Module
`NFS_services` variable
  `portmapper` variables
`NFS_world_servers` variable
  `portmapper` variables
no such connection
  run-time error
    Run-time errors for non-existing
`no_login_prompt` (login confusion state)
  `login` analyzer confusion
`no_username` (login confusion state)
  `login` analyzer confusion
`no_username2` (login confusion state)
  `login` analyzer confusion
non-blocking DNS lookups
  The Bro source code
non-existing connection
  fatal run-time error
    Predefined Functions
`non_ASCII_hosts` variable
  `login` variables
`non_backdoor_prompts` variable
  `login` variables
`non_empty_multi_login` (login confusion state)
  `login` analyzer confusion
`<none>` username
  `login` analyzer confusion
not a login connection
  run-time error
    Predefined Functions | Predefined Functions
not a TCP connection
  run-time error
    Predefined Functions | Predefined Functions
`not exactly one edit character`
  Predefined Functions
`"!in` negation of `in` operator
  Embedded Pattern Matching
`!` ``not'' operator
  Logical Operators
NT
  not supported
    Supported platforms
NUL
  Predefined Functions
`NUL_in_line` (``weird'' event)
  Events handled by `conn_weird`
NULL portmapper call
  The `portmapper` Analyzer
null statement
  Statements
NULs
  Events handled by `conn_weird`
  allowed in strings
    String Constants | Run-time errors for non-existing
  disallowed in certain function calls
    Run-time errors for non-existing
  terminating string constants
    String Constants
  termination
    Run-time errors for non-existing
  terminator missing
    run-time error
      Run-time errors for strings
`num_in_order` statistic
  The `analy` Analyzer
`num_OO` statistic
  The `analy` Analyzer
`num_pkts` statistic
  The `analy` Analyzer
`num_repl` statistic
  The `analy` Analyzer
`num_requests`
  The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
`num_rxmit` statistic
  The `analy` Analyzer
`num_rxmit_bytes` statistic
  The `analy` Analyzer
number of elements
  in table or set
    Predefined Functions
numeric types
  `count`
    Bro Types
  `int`
    Bro Types
  `double`
    Bro Types
`nuucp` username
  The `hot-ids` Module | `ident` variables
NVT (Network Virtual Terminal)
  `login` event handlers
NVT options
  authentication
    `login` event handlers | `login` event handlers
  bad
    `login` event handlers
  bad termination
    `login` event handlers
  encryption
    `login` event handlers
  inconsistent
    `login` event handlers
`-O` flag
  Flags
`\`octal-digits octal escape
  String Constants
off-line analysis
  Traffic traces | Flags | Predefined Functions | Connection functions
`ok` (RPC status code)
  `portmapper` functions
on-line analysis
  Live traffic | Flags | Predefined Variables | Predefined Functions | Connection functions
`open` function
  Files | Predefined Functions
`open_for_append` function
  Files | Predefined Functions
`open_log_file` function
  Predefined Functions
opening a file
  Predefined Functions | Predefined Functions
operator
  `&&` ``and''
    Logical Operators | Expressions
  `(` parenthesis
    Expressions | Expressions
  `!` ``not''
    Logical Operators
  `"|"|` ``or''
    Logical Operators | Expressions
  `)` parenthesis
    Expressions | Expressions
operators
  `+=`
    Filtering
  `+`
    Arithmetic Operators
  `-`
    Arithmetic Operators
  `*`
    Arithmetic Operators
  `/`
    Arithmetic Operators
  `+`
    Arithmetic Operators
  `-`
    Arithmetic Operators
  `-`
    Temporal Negation
  `+`
    Temporal Addition
  `-`
    Temporal Subtraction
  `*`
    Temporal Multiplication
  `/`
    Temporal Division
  `$`
    Accessing Fields Using ```$`''
  `++`
    Expressions
  `-`
    Expressions
  `!`
    Expressions
  `-`
    Expressions
  `+`
    Expressions
  `+`
    Expressions
  `-`
    Expressions
  `*`
    Expressions
  `/`
    Expressions
  `?`
    Expressions
  `:`
    Expressions
  `=`
    Expressions
  `(`
    Expressions
  `)`
    Expressions
  `[`
    Expressions
  `]`
    Expressions
  `in`
    Expressions
  `!in`
    Expressions
  `in`
    Expressions
  `!in`
    Expressions
  `[`
    Expressions
  `]`
    Expressions
  address
    Address Operators
  arithmetic
    Arithmetic Operators to Arithmetic Operators
    associativity
      Arithmetic Operators
    operand conversion
      Arithmetic Operators
    precedence
      Arithmetic Operators
  comparison
    Comparison Operators to Comparison Operators
    associativity
      Comparison Operators
    operand conversion
      Comparison Operators
    precedence
      Comparison Operators
  logical
    Logical Operators to Logical Operators
    associativity
      Logical Operators
    precedence
      Logical Operators
  net
    Net Operators
  pattern
    Pattern Operators
  ports
    Port Operators
  string
    String Operators
  temporal
    Temporal Operators
optimizer for policy script interpreter
  Flags
optimizing your system for Bro
  Tuning BPF
options
  Telnet
    The `login` Analyzer
`"|"|` ``or'' operator
  Logical Operators | Expressions
`orig`
  The `connection` record
`orig_h`
  The `connection` record
  `conn_id` field
    The `connection` record
`orig_p`
  The `connection` record
  `conn_id` field
    The `connection` record
`originator_RPC_reply` (``weird'' event)
  Events handled by `conn_weird`
`OTH` connection state
  Connection summaries
out-of-order delivery
  The `analy` Analyzer
`OutOfBox` username
  The `hot-ids` Module
`output_trouble` variable
  `login` variables
`-P` flag
  Flags | Flags | The `dns` Module
packet filter
  access
    Tuning BPF
  permissions
    Tuning BPF
packets
  control (SYN/FIN/RST)
    Flags | The `tcp` analyzer
  corrupted
    Events handled by `conn_weird` | Events handled by `net_weird`
  drops
    General Processing Events | Additional handlers for ``weird''
  recording
    Predefined Functions
  replication
    The `analy` Analyzer
  storms
    Events handled by `conn_weird`
  time
    Predefined Functions
`()`
  Expressions | Expressions
parenthesized expression
  Expressions
`parse_ftp_pasv` function
  Predefined Functions
`parse_ftp_port` function
  Predefined Functions
partial connections
  Generic TCP connection events
`PARTIAL_CLOSE_INTERVAL` internal variable
  Generic TCP connection events
`partial_connection` event
  Generic TCP connection events | `login` event handlers
`partial_finger_request` (``weird'' event)
  Events handled by `conn_weird`
`partial_ftp_request` (``weird'' event)
  Events handled by `conn_weird`
`partial_ident_request` (``weird'' event)
  Events handled by `conn_weird`
`partial_portmapper_request` (``weird'' event)
  Events handled by `conn_weird`
`partial_RPC` (``weird'' event)
  Events handled by `conn_weird`
partially closed connections
  Generic TCP connection events
passwd
  `http` variables
passwords
  guessing
    The `scan` Analyzer
  inadvertently exposed
    The `login` Analyzer
  sniffing
    The `login` Analyzer
`PATH_UTMP` sensitive pattern
  `login` variables
`pattern`
  see types, `pattern`
pattern matching
  Patterns
  embedded
    Embedded Pattern Matching
  exact
    Exact Pattern Matching
pattern matching expression
  Expressions
patterns
  Patterns to Embedded Pattern Matching
pending connections
  Generic TCP connection events
`pending_data_when_closed` (``weird'' event)
  Events handled by `conn_weird`
performance
  analysis tradeoffs
    Activating an Analyzer
  filtering
    Filtering
`pm_activity` function
  `portmapper` functions
`pm_attempt` function
  `portmapper` functions
`pm_attempt` portmapper attempt
  `portmapper` event handlers
`pm_attempt_callit` event
  `portmapper` event handlers
`pm_attempt_dump` event
  `portmapper` event handlers
`pm_attempt_getport` event
  `portmapper` event handlers
`pm_attempt_null` event
  `portmapper` event handlers
`pm_attempt_set` event
  `portmapper` event handlers
`pm_attempt_unset` event
  `portmapper` event handlers
`pm_bad_port` event
  `portmapper` event handlers
`pm_callit_request` portmapper call
  `portmapper` event handlers
`pm_check_getport` function
  `portmapper` functions
`pm_mapping` portmapper mapping record
  `portmapper` event handlers
`pm_port_request` portmapper request
  `portmapper` event handlers
`pm_request` function
  `portmapper` functions
`pm_request_callit` event
  `portmapper` event handlers
`pm_request_dump` event
  `portmapper` event handlers
`pm_request_getport` event
  `portmapper` event handlers
`pm_request_null` event
  `portmapper` event handlers
`pm_request_set` event
  `portmapper` event handlers
`pm_request_unset` event
  `portmapper` event handlers
policy/ policy directory
  Run-time environment
policy directories
  Run-time environment
policy script interpreter
  optimizer
    Flags
policy/local/ policy directory
  Run-time environment
polymorphic functions
  need for
    Predefined Functions | Predefined Functions | Events handled by `conn_weird_addl`
popular backdoors
  `hot` variables
  `ingreslock`
    `hot` variables
`port`
  see types, `port`
  ephemeral
    Connection functions
port scanning
  The `scan` Analyzer
port type
  Port Type to Port Operators
`port-name` module
  The `port-name` Module
`port_names` variable
  The `connection` record | Connection functions | The `port-name` Module
`portmapper` analyzer
  The `portmapper` Analyzer
portmapper attempts
  `portmapper` event handlers
  `pm_attempt`
    `portmapper` event handlers
portmapper calls
  `portmapper` event handlers
  CALLIT
    The `portmapper` Analyzer
  DUMP
    The `portmapper` Analyzer
  GETPORT
    The `portmapper` Analyzer
  NULL
    The `portmapper` Analyzer
  `pm_callit_request`
    `portmapper` event handlers
  SET
    The `portmapper` Analyzer
  UNSET
    The `portmapper` Analyzer
portmapper mapping records
  `portmapper` event handlers
  `pm_mapping`
    `portmapper` event handlers
portmapper requests
  `portmapper` event handlers
  `pm_port_request`
    `portmapper` event handlers
ports
  constants
    Port Constants
  operators
    Port Operators
  TCP
    Port Type
  TCP vs. UDP
    Predefined Functions
  UDP
    Port Type
positivation expression
  Expressions
possible future changes
  `timer` type
    Expressions
  breaking string constants across multiple lines
    String Constants
  constants for absolute times
    Temporal Constants
  use of `any` type for bypassing strong typing
    The `any` type
possible packet drop messages
  Additional handlers for ``weird''
  `ack above a hole`
    Additional handlers for ``weird''
`possible_login_ploy` (login confusion state)
  `login` analyzer confusion
`possible_port_scan_thresh` variable
  `scan` variables
`possible_split_routing` (``weird'' event)
  Events handled by `conn_weird`
`POST` HTTP method
  `http` variables
precision
  of formatted strings
    Predefined Functions
`precision specified for non-floating point format`
  Predefined Functions
predefined functions
  Predefined Functions to Functions for manipulating time
  `active_connection`
    Predefined Functions
  `active_file`
    Predefined Functions
  `add_interface`
    Predefined Functions
  `add_tcpdump_filter`
    Predefined Functions
  `log_hook`
    Predefined Functions
  `byte_len`
    Predefined Functions
  `cat`
    Predefined Functions
  `clean`
    Predefined Functions
  `close`
    Predefined Functions
  `connection_record`
    Predefined Functions
  `contains_string`
    Predefined Functions
  `current_time`
    Predefined Functions
  `discarder_check_icmp`
    Predefined Functions
  `discarder_check_ip`
    Predefined Functions
  `discarder_check_tcp`
    Predefined Functions
  `discarder_check_udp`
    Predefined Functions
  `edit`
    Predefined Functions
  `exit`
    Predefined Functions
  `flush_all`
    Predefined Functions
  `fmt`
    Predefined Functions
  `get_login_state`
    Predefined Functions
  `get_orig_seq`
    Predefined Functions
  `get_resp_seq`
    Predefined Functions
  `getenv`
    Predefined Functions
  `is_tcp_port`
    Predefined Functions
  `length`
    Predefined Functions
  `log_file_name`
    Predefined Functions
  `mask_addr`
    Predefined Functions
  `max_count`
    Predefined Functions
  `max_double`
    Predefined Functions
  `max_interval`
    Predefined Functions
  `min_count`
    Predefined Functions
  `min_double`
    Predefined Functions
  `min_interval`
    Predefined Functions
  `mkdir`
    Predefined Functions
  `network_time`
    Predefined Functions
  `open`
    Predefined Functions
  `open_for_append`
    Predefined Functions
  `open_log_file`
    Predefined Functions
  `parse_ftp_pasv`
    Predefined Functions
  `parse_ftp_port`
    Predefined Functions
  `reading_live_traffic`
    Predefined Functions
  `set_buf`
    Predefined Functions
  `set_contents_file`
    Predefined Functions
  `set_login_state`
    Predefined Functions
  `set_record_packets`
    Predefined Functions
  `skip_further_processing`
    Predefined Functions
  `sub_bytes`
    Predefined Functions
  `system`
    Predefined Functions
  `to_lower`
    Predefined Functions
  `to_net`
    Predefined Functions
  `to_upper`
    Predefined Functions
predefined variables
  Predefined Variables to Predefined Variables
  `bro_log_file`
    Predefined Variables
  `capture_filter`
    Predefined Variables
  `direct_login_prompts`
    Predefined Variables
  `discarder_maxlen`
    Predefined Variables
  `done_with_network`
    Predefined Variables
  `interfaces`
    Predefined Variables
  `login_failure_msgs`
    Predefined Variables
  `login_non_failure_msgs`
    Predefined Variables
  `login_prompts`
    Predefined Variables
  `login_success_msgs`
    Predefined Variables
  `login_timeouts`
    Predefined Variables
  `max_timer_expires`
    Predefined Variables
  `restrict_filter`
    Predefined Variables
  `skip_authentication`
    Predefined Variables
prefixes
  Flags | Run-time environment
  network
    Net Type | Predefined Functions | Site variables | Site variables
`premature_connection_reuse` (``weird'' event)
  Events handled by `conn_weird`
priming Bro's private caches (DNS, regular expression)
  Flags
`print` keyword
  Statements
`print` statement
  Statements
`print-filter` analyzer
  Filtering | Filtering | Filtering
printf
  Predefined Functions
processing
  avoiding
    Predefined Functions
`prog unavail` (RPC status code)
  `portmapper` functions
programs
  hf
    no title
  cf
    no title
`-r` flag
  Flags
reactive firewall
  `scan` variables | `scan` functions
`&read_expire` attribute
  Table Attributes
reading `tcpdump` files
  Flags
`reading_live_traffic` function
  Predefined Functions
`record`
  see types, `record`
  `ftp_port`
    Predefined Functions
  `ftp_port`
    Predefined Functions
  `connection`
    The `connection` record
record constructor expression
  Expressions
record field access expression
  Expressions
record field test expression
  Expressions
`record_connection` function
  Connection functions
recorded traffic
  Predefined Functions
recording connections
  Connection functions
recording packets
  Predefined Functions
records
  Records to Record Assignment | Predefined Functions | Predefined Functions | General Processing Events | General Processing Events | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record | Connection summaries | no title | The `dns_mapping` record | The `dns_mapping` record | no title | The `ftp_session_info` record | `login` functions
  assignment
    Record Assignment to Record Assignment
  `check_info`
    `login` functions
  `conn_id`
    The `connection` record | The `connection` record | The `connection` record
  `connection`
    The `connection` record | The `connection` record | The `connection` record | The `connection` record | The `connection` record
  `dns_mapping`
    no title | The `dns_mapping` record | The `dns_mapping` record
  `endpoint`
    The `connection` record | The `connection` record | The `connection` record | Connection summaries
  field attributes
    Record Assignment
  fields
    Records
    accessing
      Accessing Fields Using ```$`''
    legal names
      Defining records
  `ftp_port`
    Predefined Functions | Predefined Functions
  `ftp_session_info`
    no title | The `ftp_session_info` record
  `net_stats`
    General Processing Events | General Processing Events
`red` connection summary file
  Connection summaries | Connection summaries
`&redef` attribute
  Refinement
redefining functions
  Functions
redefining variables
  Refinement
refinement
  Refinement
regular expressions
  Bro's private cache
    Flags
  compiling
    Flags
`REJ` connection state
  Connection summaries
rejected connections
  Generic TCP connection events
relational expression
  Expressions
relationals
  address
    Address Type
  net
    Net Operators
  numeric
    Comparison Operators
  string
    String Operators
  temporal
    Temporal Relationals
relative time
  Temporal Types
remote procedure call (RPC)
  The `portmapper` Analyzer
repeat text
  `login` analyzer confusion | `login` analyzer confusion
repeat text (VMS)
  `login` analyzer confusion
`repeat_without_username` (login confusion state)
  `login` analyzer confusion
`repeated_SYN_reply_wo_ack` (``weird'' event)
  Events handled by `conn_weird`
`repeated_SYN_with_ack` (``weird'' event)
  Events handled by `conn_weird`
replication of packets
  The `analy` Analyzer
`report_accounts_tried` variable
  `scan` variables
`report_outbound_peer_scan` variable
  `scan` variables
`report_peer_scan` variable
  `scan` variables
`report_remote_accounts_tried` variable
  `scan` variables
`report_weird` function
  `weird` functions
`report_weird_conn` function
  `weird` functions
`report_weird_orig` function
  `weird` functions
`req_addr`
  The `dns_mapping` record
  `dns_mapping` field
    The `dns_mapping` record
`req_host`
  The `dns_mapping` record
  `dns_mapping` field
    The `dns_mapping` record
`request`
  The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
`request_t`
  The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
reserved multicast addresss
  `portmapper` variables
  `sun-rpc.mcast.net`
    `portmapper` variables
reset connections
  Generic TCP connection events
`resp`
  The `connection` record
`resp_h`
  The `connection` record
  `conn_id` field
    The `connection` record
`resp_p`
  The `connection` record
  `conn_id` field
    The `connection` record
`responder_environment` (login confusion state)
  `login` analyzer confusion
`responder_RPC_call` (``weird'' event)
  Events handled by `conn_weird`
`restrict_filter` global variable
  Flags
`restrict_filter` variable
  Predefined Variables | Filtering to Filtering
restricting traffic
  Filtering
retransmission
  inconsistent
    Events handled by `conn_weird` | Additional handlers for ``weird''
`return` keyword
  Statements
`return` statement
  Statements
`rewt` username
  The `hot-ids` Module | `login` variables
`rexmit_inconsistency` event
  Additional handlers for ``weird''
`.rhosts`
  `ftp` variables | The `login` Analyzer | `login` analyzer confusion | `login` variables | `login` event handlers
`ridiculous field width or precision`
  Predefined Functions
`)` operator
  Expressions | Expressions
`RLIMIT_NOFILE` a
  Files
Rlogin
  session state
    Predefined Functions | Predefined Functions
  sessions
    The `login` Analyzer
  weird events
    Events handled by `conn_weird`
`rlogin_id_okay_if_no_password_exposed` variable
  `login` variables
`rlogin_text_after_rejected` (``weird'' event)
  Events handled by `conn_weird`
root
  backdoors
    `login` variables
  Bro not running as
    Tuning BPF
  setuid
    `login` variables
`router_prompts` variable
  `login` variables
routing
  split
    Events handled by `conn_weird`
RPC (Remote Procedure Call)
  The `portmapper` Analyzer
  reserved multicast address
    `portmapper` variables
  weird events
    Events handled by `conn_weird`
RPC status codes
  `portmapper` functions | `portmapper` functions | `portmapper` functions | `portmapper` functions | `portmapper` functions | `portmapper` functions | `portmapper` functions | `portmapper` functions
  `auth error`
    `portmapper` functions
  `garbage args`
    `portmapper` functions
  `mismatch`
    `portmapper` functions
  `ok`
    `portmapper` functions
  `prog unavail`
    `portmapper` functions
  `system err`
    `portmapper` functions
  `timeout`
    `portmapper` functions
  `unknown`
    `portmapper` functions
`RPC_dump_okay` variable
  `portmapper` variables
`RPC_okay` variable
  `portmapper` variables
`RPC_okay_nets` variable
  `portmapper` variables
`RPC_okay_services` variable
  `portmapper` variables
`rpc_prog` function
  `portmapper` functions
`rpc_programs` variable
  `portmapper` variables
`RPC_rexmit_inconsistency` (``weird'' event)
  Events handled by `conn_weird`
RST control packet
  Flags | The `tcp` analyzer
RST termination
  causing undetermined connection size
    `ftp` variables
`RST_storm` (``weird'' event)
  Events handled by `conn_weird`
`RST_with_data` (``weird'' event)
  Events handled by `conn_weird`
`RSTO` connection state
  Connection summaries
`RSTOS0` connection state
  Connection summaries
`RSTR` connection state
  Connection summaries
`RSTRH` connection state
  Connection summaries
run-time error
  bad address mask
    Predefined Functions
  bad fmt date argument
    Predefined Functions
  bad fmt editing character
    Predefined Functions
  bad fmt field width
    Predefined Functions
  bad fmt floating-point argument
    Predefined Functions
  bad fmt format specifier
    Predefined Functions
  bad fmt integer argument
    Predefined Functions
  bad fmt precision
    Predefined Functions
  bad length argument (not a table or set)
    Predefined Functions
  can't open
    Run-time environment
  converting an IPv6 address to net
    Predefined Functions
  embedded NUL
    Run-time errors for strings
  mkdir failure
    Predefined Functions
  no such connection
    Run-time errors for non-existing
  non-existing connection
    Predefined Functions
  not a login connection
    Predefined Functions | Predefined Functions
  not a TCP connection
    Predefined Functions | Predefined Functions
  NULs
    terminator missing
      Run-time errors for strings
  watchdog timer expired
    Flags
  wrong number of fmt arguments
    Predefined Functions
  wrong number of length arguments
    Predefined Functions
running Bro
  Running Bro
running outside scripts or executables
  Predefined Functions
`S0` connection state
  Connection summaries
`S1` connection state
  Connection summaries
`S2` connection state
  Connection summaries
`S3` connection state
  Connection summaries
`same_local_net_is_spoof` variable
  `hot` variables
save file
  control over what's recorded
    Predefined Functions
  reading
    Flags
  writing
    Flags
scalars
  Declaring Tables
`scan` analyzer
  The `scan` Analyzer
scan detection
  The `scan` Analyzer to `scan` event handlers
scanning
  address
    The `scan` Analyzer
  port
    The `scan` Analyzer
  shutting down
    `scan` variables | `scan` functions
  stealth
    Generic TCP connection events | `hot` functions | `scan` functions | Events handled by `conn_weird` | Events handled by `conn_weird`
`schedule` keyword
  Expressions
scheduling events
  Expressions
scoping of variables
  Scope
script kiddies
  `hot` variables
scripting
  general
    Predefined Functions
scripts
  running
    Predefined Functions
  standard
    Analyzers and Events to The `interconn` Analyzer
search path
  Run-time environment
searching for strings
  Patterns
`sec` (seconds) interval unit
  Temporal Constants
semi-colon statement termination
  Statements
sensitive /24 destination networks
  `hot` variables
sensitive /24 source networks
  `hot` variables
sensitive destination addresses
  `hot` variables
sensitive filenames
  `ftp` variables | `login` variables
  `eggdrop`
    `ftp` variables
sensitive information
  inadvertently exposed
    The `login` Analyzer
sensitive login inputs
  `login` variables
  `eggdrop`
    `login` variables
sensitive patterns
  `login` variables
  `PATH_UTMP`
    `login` variables
sensitive POST URIs
  `http` variables
  `wwwroot`
    `http` variables
sensitive services
  confused with ephemeral ports
    `hot` variables
sensitive source addresses
  `hot` variables
sensitive usernames
  The `hot-ids` Module
`sensitive_post_URIs` variable
  `http` variables
`sensitive_URIs` variable
  `http` variables
sensitivity associated with a connection
  The `connection` record
sequence numbers
  connection originator
    Predefined Functions
  connection responder
    Predefined Functions
`service`
  The `connection` record
  `connection` field
    The `connection` record
service associated with a connection
  The `connection` record | Connection summaries | Connection functions | Connection functions
`service_name` function
  Connection functions
services
  allowable
    `hot` variables
  allowed to a particular host
    `hot` variables
  allowed to particular host pairs
    `hot` variables
  fatal if inbound
    `hot` variables
  forbidden
    `hot` variables
  forbidden if attempted
    `hot` variables
  forbidden if inbound
    `hot` variables
`set`
  see types, `set`
SET portmapper call
  The `portmapper` Analyzer
set size
  Predefined Functions
set type
  Sets to Sets
`set_buf` function
  Predefined Functions
`set_contents_file` function
  Predefined Functions
`set_login_state` function
  Predefined Functions
`set_record_packets` function
  Predefined Functions
`setrlimit` system calls
  Files
setuid root
  `login` variables
`SF` connection state
  Connection summaries
`sgiweb` username
  The `hot-ids` Module
sh
  Predefined Functions
`SH` connection state
  Connection summaries
shadow
  `http` variables
shadowing
  Filtering
shallow copy
  Record Assignment | Table Assignment
shedding load
  Predefined Functions
shell escape
  Predefined Functions
shell scripts
  drop-connectivity
    `scan` functions
short-circuit `&&` ``and'' operator
  Logical Operators | Expressions
short-circuit `"|"|` ``or'' operator
  Logical Operators | Expressions
`SHR` connection state
  Connection summaries
`shut_down_all_scans` variable
  `scan` variables
`shut_down_scans` variable
  `scan` variables
`shut_down_thresh` variable
  `scan` variables
shutting down scans
  `scan` variables | `scan` functions
SIGHUP
  General Processing Events
SIGINT
  General Processing Events
signal handling
  General Processing Events
SIGTERM
  General Processing Events
simultaneous open
  Events handled by `conn_weird`
`simultaneous_open` (``weird'' event)
  Events handled by `conn_weird`
site addresses
  Site-specific functions
`site` analyzer
  Site-specific information
site-specific
  functions
    Site-specific functions to Site-specific functions
  information
    Site-specific information
  variables
    Site variables to Site variables
`size`
  The `connection` record
  `endpoint` field
    The `connection` record
  of table or set
    Predefined Functions
size of connection
  Connection summaries | Connection functions
`skip_accounts_tried` variable
  `scan` variables
`skip_authentication` variable
  Predefined Variables | `login` variables
`skip_further_processing` function
  Predefined Functions
`skip_logins_to` variable
  `login` variables
`skip_outbound_services` variable
  `scan` variables
`skip_scan_nets_24` variable
  `scan` variables
`skip_scan_sources` variable
  `scan` variables
`skip_unexpected` variable
  `ftp` variables
`skip_unexpected_net` variable
  `ftp` variables
`(skipped)` authentication annotation
  `login` event handlers
slow startup due to compiling regular expressions
  Flags
`smashdu.c` exploit tool
  `login` variables
smurf attacks
  `login` variables
sniffer logs
  `login` variables
sniffing
  The `login` Analyzer
source code
  for Bro
    The Bro source code
split routing
  Events handled by `conn_weird`
`spontaneous_FIN` (``weird'' event)
  Events handled by `conn_weird`
`spontaneous_RST` (``weird'' event)
  Events handled by `conn_weird`
spoofing
  allowable services
    `hot` variables
  detection
    `hot` variables | `hot` functions
spook detection
  `hot` variables
sprintf
  Predefined Functions
standard scripts
  Analyzers and Events to The `interconn` Analyzer
start time of a connection
  The `connection` record | Connection summaries
`start_time`
  The `connection` record
  `connection` field
    The `connection` record
startup
  event
    General Processing Events
  transients
    Events handled by `conn_weird`
startup slow due to compiling regular expressions
  Flags
`state`
  The `connection` record
  `endpoint` field
    The `connection` record
  of a Telnet/Rlogin session
    Predefined Functions | Predefined Functions
state management
  Table Attributes
state of connection
  Connection summaries | Connection functions
state of login connections
  Predefined Functions | Predefined Functions | Predefined Functions | Predefined Functions
  `LOGIN_STATE_AUTHENTICATE`
    Predefined Functions
  `LOGIN_STATE_CONFUSED`
    Predefined Functions
  `LOGIN_STATE_LOGGED_IN`
    Predefined Functions
  `LOGIN_STATE_SKIP`
    Predefined Functions
statements
  Statements to Statements
  expression
    Statements
  `print`
    Statements
  `log`
    Statements
  `event`
    Statements
  `if`
    Statements
  `for`
    Statements
  `next`
    Statements
  `break`
    Statements
  `return`
    Statements
  `add`
    Statements
  `delete`
    Statements
  compound
    Statements
  null
    Statements
  `local`
    Statements
  `const`
    Statements
  multi-line
    Statements
  semi-colon termination
    Statements
static typing
  Bro Types
statistical analysis
  The `analy` Analyzer
statistics
  The `analy` Analyzer | The `analy` Analyzer | The `analy` Analyzer | The `analy` Analyzer | The `analy` Analyzer | The `analy` Analyzer | The `analy` Analyzer
  `endian_type`
    The `analy` Analyzer
  `num_in_order`
    The `analy` Analyzer
  `num_OO`
    The `analy` Analyzer
  `num_pkts`
    The `analy` Analyzer
  `num_repl`
    The `analy` Analyzer
  `num_rxmit`
    The `analy` Analyzer
  `num_rxmit_bytes`
    The `analy` Analyzer
stderr
  Predefined Variables | Predefined Functions | The `log` Module
stdout
  Statements | Predefined Functions
stealth scans
  Generic TCP connection events | `hot` functions | `scan` functions | Events handled by `conn_weird` | Events handled by `conn_weird`
storms
  Events handled by `conn_weird`
strftime
  Predefined Functions
`string`
  see types, `string`
  extraction
    Predefined Functions
  formatting
    Predefined Functions
string constants
  NUL terminated
    String Constants
`string with embedded NUL`
  Run-time errors for strings
`string without NUL terminator`
  Run-time errors for strings
`"<string-with-NUL>"` error value
  Run-time errors for strings
strings
  Strings to String Operators
  cleaned up
    Predefined Functions
  concatenation
    Predefined Functions
  length
    Predefined Functions
  termination with NULs
    Run-time errors for non-existing
strlen
  Predefined Functions
strstr
  Predefined Functions
sub-tables
  lack of
    Accessing Tables
`sub_bytes` function
  Predefined Functions
subnets
  Net Type | Predefined Functions | Predefined Functions | Site variables | Site variables
substrings
  Predefined Functions
subtraction
  numeric
    Arithmetic Operators
  temporal
    Temporal Subtraction
`sun-rpc.mcast.net` reserved multicast address
  `portmapper` variables
`suppress_pm_log` variable
  `portmapper` variables
SYN control packet
  Flags | The `tcp` analyzer
`SYN_after_close` (``weird'' event)
  Events handled by `conn_weird`
`SYN_after_partial` (``weird'' event)
  Events handled by `conn_weird`
`SYN_after_reset` (``weird'' event)
  Events handled by `conn_weird`
`SYN_inside_connection` (``weird'' event)
  Events handled by `conn_weird`
`SYN_seq_jump` (``weird'' event)
  Events handled by `conn_weird`
`SYN_with_data` (``weird'' event)
  Events handled by `conn_weird`
syslog
  Statements
syslog levels
  Statements
  `LOG_NOTICE`
    Statements
system callss
  Files
  `setrlimit`
    Files
system configuration
  Tuning BPF
`system err` (RPC status code)
  `portmapper` functions
`system` function
  Predefined Functions
T/TCP
  Events handled by `conn_weird`
`\t` tab escape
  String Constants
`table`
  see types, `table`
table size
  Predefined Functions
tables
  Tables to Deleting Table Elements
  clearing entries
    Table Assignment
TCP
  analysis
    The `tcp` analyzer
  checksum error
    Events handled by `conn_weird`
  Christmas packet
    Events handled by `conn_weird`
  connections
    Definitions of connections
  corrupted header
    Events handled by `net_weird`
  events
    Generic TCP connection events
  fragments
    The `frag` Module
  transaction
    Events handled by `conn_weird`
  weird events
    Events handled by `conn_weird`
`tcp` analyzer
  no title
TCP control packets (SYN/FIN/RST)
  Flags | The `tcp` analyzer
TCP vs. UDP ports
  Predefined Functions
TCP Wrappers
  reset vs. rejected connections
    Generic TCP connection events
TCP-specific connection events
  Generic TCP connection events
`TCP_christmas` (``weird'' event)
  Events handled by `conn_weird`
`tcpdump`
  Tuning BPF | Running Bro on network | Flags | Flags | Flags | Flags | Filtering | Filtering | Filtering
  bugs
    Filtering
  filters
    Flags | Filtering
  merging save files
    Flags
  reading save files
    Running Bro on network | Flags
  running concurrently with Bro
    Tuning BPF
  shadow
    Filtering
  turning off optimization
    Filtering
  writing save files
    Flags
Telnet
  options
    The `login` Analyzer
    authentication
      `login` event handlers | `login` event handlers
    bad
      `login` event handlers
    bad termination
      `login` event handlers
    encryption
      `login` event handlers
    environment
      `login` analyzer confusion
    inconsistent
      `login` event handlers
  session state
    Predefined Functions | Predefined Functions
  sessions
    The `login` Analyzer
temporal
  addition
    Temporal Addition
  constants
    Temporal Constants
  division
    Temporal Division
  multiplication
    Temporal Multiplication
  negation
    Temporal Negation
  relationals
    Temporal Relationals
  subtraction
    Temporal Subtraction
  types
    Temporal Types
TERM signal
  General Processing Events
terminal type backdoors
  `login` variables
  `VT666`
    `login` variables
`terminate_connection` function
  Connection functions
`terminate_successful_inbound_service` variable
  `hot` variables
terminating connections forcibly
  Connection functions
termination event
  General Processing Events | General Processing Events
text
  formatting
    Predefined Functions
TFreak
  `login` variables
`time`
  see types, `time` | Temporal Types to Temporal Relationals
  clock
    Predefined Functions | Predefined Functions
  packet
    Predefined Functions
`timeout` (RPC status code)
  `portmapper` functions
timer expiration
  Expressions | Predefined Variables
timers
  Expressions
timestamps
  mapping to readable form
    The cf utility
`to_lower` function
  Predefined Functions
`to_net` function
  Predefined Functions
`to_upper` function
  Predefined Functions
tolower
  Predefined Functions
`too few arguments for format`
  Predefined Functions
`too many arguments for format`
  Predefined Functions
toupper
  Predefined Functions
trace file
  control over what's recorded
    Predefined Functions
  reading
    Flags
  writing
    Flags
traffic
  live vs. recorded
    Statements | Predefined Functions
  restricting
    Filtering
transaction TCP
  Events handled by `conn_weird`
transients
  startup
    Events handled by `conn_weird`
trojaning
  `login` variables
truncated headers
  Events handled by `net_weird`
`truncated_header` (``weird'' event)
  Events handled by `net_weird`
`truncated_IP` (``weird'' event)
  Events handled by `net_weird`
tunneling
  `login` event handlers
type casting
  not provided in Bro
    The `any` type
type inference
  Typing
type-ahead
  maximum allowed
    `login` analyzer confusion
types
  `bool`
    Bro Types
  numeric
    Bro Types
  `count`
    Bro Types
  `int`
    Bro Types
  `double`
    Bro Types
  enumeration
    Bro Types
  `enum`
    Bro Types
  `string`
    Bro Types
  `pattern`
    Bro Types
  temporal
    Bro Types
  `time`
    Bro Types
  `interval`
    Bro Types
  `port`
    Bro Types
  `addr`
    Bro Types
  `net`
    Bro Types
  `record`
    Bro Types
  `table`
    Bro Types
  `set`
    Bro Types
  `file`
    Bro Types
  `function`
    Bro Types
  `event`
    Bro Types
  `bool`
    Logical Operators
  `count`
    Numeric Types
  `int`
    Numeric Types
  `double`
    Numeric Types
  numeric
    Numeric Types
  numeric
    to Comparison Operators
  `enum`
    Enumerations
  `string`
    Strings
  `pattern`
    Patterns
  `time`
    Temporal Types
  `interval`
    Temporal Types
  conversion
    Type Conversions to Type Conversions
    automatic
      Type Conversions
  numeric
    `bool` not numeric
      Mixing Numeric Types
    intermixing
      Mixing Numeric Types
  overview
    Bro Types
types, need fors
  The `connection` record
  `union`
    The `connection` record
typing
  static
    Bro Types
typing of variables
  Typing
UDP
  analysis
    The `udp` analyzer
  checksum error
    Events handled by `conn_weird`
  ``connections''
    Definitions of connections
  fragments
    The `frag` Module
  length mismatch
    Events handled by `conn_weird`
  timeout
    Definitions of connections
  weird events
    Events handled by `conn_weird`
`udp` analyzer
  no title
`UDP_datagram_length_mismatch` (``weird'' event)
  Events handled by `conn_weird`
`udp_reply` event
  The `udp` analyzer
`udp_request` event
  The `udp` analyzer
unanalyzed data
  Events handled by `conn_weird`
undirectional analysis
  Events handled by `conn_weird`
union type
  need for
    Predefined Functions
`union` types, need for
  The `connection` record
Unix analysis
  The `login` Analyzer
Unix support
  Supported platforms
Unix timestamps
  The cf utility
`unknown` (RPC status code)
  `portmapper` functions
`unpaired_RPC_response` (``weird'' event)
  Events handled by `conn_weird`
UNSET portmapper call
  The `portmapper` Analyzer
`unsolicited_SYN_response` (``weird'' event)
  Events handled by `conn_weird`
unusual events
  The `weird` Module to Additional handlers for ``weird''
  prevalence in actual network traffic
    The `weird` Module
usage message
  Flags
`usec` (microseconds) interval unit
  Temporal Constants
`user`
  The `ftp_session_info` record
  `ftp_session_info` field
    The `ftp_session_info` record
`$USER` environment variable
  `login` analyzer confusion
user keystrokes
  analysis
    The `login` Analyzer
  editing
    `login` variables
\tt Username: (VMS login prompt)
  `login` analyzer confusion
`username_with_embedded_repeat` (login confusion state)
  `login` analyzer confusion
usernames
  The `hot-ids` Module | The `hot-ids` Module | The `hot-ids` Module | The `hot-ids` Module | The `hot-ids` Module | The `hot-ids` Module | The `hot-ids` Module | The `hot-ids` Module | `ident` variables | `ident` variables | `ident` variables | `login` variables
  `4Dgifts`
    The `hot-ids` Module
  `daemon`
    The `hot-ids` Module | `ident` variables
  extracting
    The `login` Analyzer | `login` analyzer confusion
  `EZsetup`
    The `hot-ids` Module
  missing
    `login` analyzer confusion | `login` analyzer confusion
  `<none>`
    `login` analyzer confusion
  `nuucp`
    The `hot-ids` Module | `ident` variables
  `OutOfBox`
    The `hot-ids` Module
  repeated
    `login` analyzer confusion
  `rewt`
    The `hot-ids` Module | `login` variables
  sensitive
    The `hot-ids` Module
  `sgiweb`
    The `hot-ids` Module
  `uucp`
    The `hot-ids` Module | `ident` variables
/usr/local/lib/bro/ policy directory
  Run-time environment
utilities
  fetch
    `login` variables
  flex
    Pattern Constants
  lex
    Pattern Constants
  ls
    `login` variables
  lynx
    `login` variables
utility programs
  hf
    no title
  cf
    no title
`uucp` username
  The `hot-ids` Module | `ident` variables
`-v` flag
  Flags
`valid`
  The `dns_mapping` record
  `dns_mapping` field
    The `dns_mapping` record
values
  overview
    Overview
vantage point
  Events handled by `conn_weird`
variable declarations
  Scope | Scope | Modifiability
  `const`
    Modifiability
  `global`
    Scope
  `local`
    Scope
variable expression
  Expressions
variables
  `bro_log_file`
    Predefined Variables
  `capture_filter`
    Predefined Variables
  `direct_login_prompts`
    Predefined Variables
  `discarder_maxlen`
    Predefined Variables
  `done_with_network`
    Predefined Variables
  `interfaces`
    Predefined Variables
  `login_failure_msgs`
    Predefined Variables
  `login_non_failure_msgs`
    Predefined Variables
  `login_prompts`
    Predefined Variables
  `login_success_msgs`
    Predefined Variables
  `login_timeouts`
    Predefined Variables
  `max_timer_expires`
    Predefined Variables
  `restrict_filter`
    Predefined Variables
  `skip_authentication`
    Predefined Variables
  `capture_filter`
    Filtering
  `restrict_filter`
    Filtering
  `restrict_filter`
    to Filtering
  `capture_filter`
    to Filtering
  `port_names`
    The `connection` record
  `port_names`
    Connection functions
  `local_nets`
    Site variables
  `local_16_nets`
    Site variables
  `local_24_nets`
    Site variables
  `neighbor_nets`
    Site variables
  `neighbor_16_nets`
    Site variables
  `neighbor_24_nets`
    Site variables
  `same_local_net_is_spoof`
    `hot` variables
  `allow_spoof_services`
    `hot` variables
  `allow_pairs`
    `hot` variables
  `allow_16_net_pairs`
    `hot` variables
  `hot_srcs`
    `hot` variables
  `hot_dsts`
    `hot` variables
  `hot_src_24nets`
    `hot` variables
  `hot_dst_24nets`
    `hot` variables
  `allow_services`
    `hot` variables
  `allow_services_to`
    `hot` variables
  `allow_services_pairs`
    `hot` variables
  `flag_successful_service`
    `hot` variables
  `flag_successful_inbound_service`
    `hot` variables
  `terminate_successful_inbound_service`
    `hot` variables
  `flag_rejected_service`
    `hot` variables
  `report_peer_scan`
    `scan` variables
  `report_outbound_peer_scan`
    `scan` variables
  `possible_port_scan_thresh`
    `scan` variables
  `report_accounts_tried`
    `scan` variables
  `report_remote_accounts_tried`
    `scan` variables
  `skip_accounts_tried`
    `scan` variables
  `skip_outbound_services`
    `scan` variables
  `addl_web`
    `scan` variables
  `skip_scan_sources`
    `scan` variables
  `skip_scan_nets_24`
    `scan` variables
  `can_drop_connectivity`
    `scan` variables
  `shut_down_scans`
    `scan` variables
  `shut_down_all_scans`
    `scan` variables
  `shut_down_thresh`
    `scan` variables
  `never_shut_down`
    `scan` variables
  `port_names`
    The `port-name` Module
  `bro_log_file`
    The `log` Module
  `active_conn`
    The `active` Module
  `dns_interesting_changes`
    `dns` variables
  `hot_names`
    `finger` variables
  `max_request_length`
    `finger` variables
  `forbidden_ids`
    The `hot-ids` Module
  `forbidden_ids_if_no_password`
    The `hot-ids` Module
  `forbidden_id_patterns`
    The `hot-ids` Module
  `always_hot_ids`
    The `hot-ids` Module
  `hot_ids`
    The `hot-ids` Module
  `ftp_guest_ids`
    `ftp` variables
  `ftp_skip_hot`
    `ftp` variables
  `ftp_hot_files`
    `ftp` variables
  `ftp_not_actually_hot_files`
    `ftp` variables
  `ftp_hot_guest_files`
    `ftp` variables
  `skip_unexpected`
    `ftp` variables
  `skip_unexpected_net`
    `ftp` variables
  `sensitive_URIs`
    `http` variables
  `sensitive_post_URIs`
    `http` variables
  `hot_ident_ids`
    `ident` variables
  `hot_ident_exceptions`
    `ident` variables
  `input_trouble`
    `login` variables
  `edited_input_trouble`
    `login` variables
  `output_trouble`
    `login` variables
  `backdoor_prompts`
    `login` variables
  `non_backdoor_prompts`
    `login` variables
  `hot_terminal_types`
    `login` variables
  `hot_telnet_orig_ports`
    `login` variables
  `hot_ssh_orig_ports`
    `login` variables
  `skip_authentication`
    `login` variables
  `direct_login_prompts`
    `login` variables
  `login_prompts`
    `login` variables
  `login_failure_msgs`
    `login` variables
  `login_non_failure_msgs`
    `login` variables
  `router_prompts`
    `login` variables
  `login_success_msgs`
    `login` variables
  `login_timeouts`
    `login` variables
  `non_ASCII_hosts`
    `login` variables
  `skip_logins_to`
    `login` variables
  `always_hot_login_ids`
    `login` variables
  `hot_login_ids`
    `login` variables
  `rlogin_id_okay_if_no_password_exposed`
    `login` variables
  `rpc_programs`
    `portmapper` variables
  `NFS_services`
    `portmapper` variables
  `RPC_okay`
    `portmapper` variables
  `RPC_okay_nets`
    `portmapper` variables
  `RPC_okay_services`
    `portmapper` variables
  `NFS_world_servers`
    `portmapper` variables
  `RPC_dump_okay`
    `portmapper` variables
  `any_RPC_okay`
    `portmapper` variables
  `suppress_pm_log`
    `portmapper` variables
  `weird_action`
    `weird` variables
  `weird_action_filters`
    `weird` variables
  `weird_ignore_host`
    `weird` variables
  `weird_do_not_ignore_repeats`
    `weird` variables
  attributes
    Attributes
  constant
    Statements
  initialization
    Initialization
  local
    Statements
  modifiability
    Modifiability
  overview
    Overview
  redefining
    Refinement
  refinement
    Refinement
  scope
    Statements
  scoping
    Scope
  typing
    Typing
version message
  Flags
VMS input editing
  `login` analyzer confusion | `login` analyzer confusion | `login` analyzer confusion
VMS login prompts
  `login` analyzer confusion
  \tt Username:
    `login` analyzer confusion
`VT666` terminal type backdoor
  `login` variables
`-W` flag
  Flags | Flags
walld
  `portmapper` variables | `portmapper` variables | `portmapper` event handlers | `portmapper` event handlers
watchdog
  Flags
watchdog timer expired
  run-time error
    Flags
`WATCHDOG_INTERVAL` internal variable
  Flags
``weird'' event
  Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird` | Events handled by `conn_weird_addl` | Events handled by `conn_weird_addl` | Events handled by `conn_weird_addl` | Events handled by `flow_weird` | Events handled by `flow_weird` | Events handled by `flow_weird` | Events handled by `flow_weird` | Events handled by `flow_weird` | Events handled by `flow_weird` | Events handled by `flow_weird` | Events handled by `flow_weird` | Events handled by `net_weird` | Events handled by `net_weird` | Events handled by `net_weird` | Events handled by `net_weird` | Events handled by `net_weird` | Events generated by the | Events generated by the
  `active_connection_reuse`
    Events handled by `conn_weird`
  `bad_HTTP_reply`
    Events handled by `conn_weird`
  `bad_HTTP_version`
    Events handled by `conn_weird`
  `bad_ICMP_checksum`
    Events handled by `conn_weird`
  `bad_ident_reply`
    Events handled by `conn_weird_addl`
  `bad_ident_request`
    Events handled by `conn_weird_addl`
  `bad_IP_checksum`
    Events handled by `net_weird`
  `bad_pm_port`
    Events generated by the
  `bad_rlogin_prolog`
    Events handled by `conn_weird`
  `bad_RPC`
    Events handled by `conn_weird`
  `bad_RPC_program`
    Events handled by `conn_weird`
  `bad_SYN_ack`
    Events handled by `conn_weird`
  `bad_TCP_checksum`
    Events handled by `conn_weird`
  `bad_TCP_header_len`
    Events handled by `net_weird`
  `bad_UDP_checksum`
    Events handled by `conn_weird`
  `baroque_SYN`
    Events handled by `conn_weird`
  `blank_in_HTTP_request`
    Events handled by `conn_weird`
  `connection_originator_SYN_ack`
    Events handled by `conn_weird`
  `data_after_reset`
    Events handled by `conn_weird`
  `data_before_established`
    Events handled by `conn_weird`
  `excess_RPC`
    Events handled by `conn_weird`
  `excessive_RPC_len`
    Events handled by `conn_weird`
  `excessively_large_fragment`
    Events handled by `flow_weird`
  `excessively_small_fragment`
    Events handled by `flow_weird`
  `FIN_advanced_last_seq`
    Events handled by `conn_weird`
  `FIN_after_reset`
    Events handled by `conn_weird`
  `FIN_storm`
    Events handled by `conn_weird`
  `fragment_inconsistency`
    Events handled by `flow_weird`
  `fragment_overlap`
    Events handled by `flow_weird`
  `fragment_protocol_inconsistency`
    Events handled by `flow_weird`
  `fragment_size_inconsistency`
    Events handled by `flow_weird`
  `fragment_with_DF`
    Events handled by `flow_weird`
  `HTTP_unknown_method`
    Events handled by `conn_weird`
  `HTTP_version_mismatch`
    Events handled by `conn_weird`
  `ident_request_addendum`
    Events handled by `conn_weird_addl`
  `inappropriate_FIN`
    Events handled by `conn_weird`
  `incompletely_captured_fragment`
    Events handled by `flow_weird`
  `internally_truncated_header`
    Events handled by `net_weird`
  `Land_attack`
    Events generated by the
  `multiple_HTTP_request_elements`
    Events handled by `conn_weird`
  `multiple_RPCs`
    Events handled by `conn_weird`
  `NUL_in_line`
    Events handled by `conn_weird`
  `originator_RPC_reply`
    Events handled by `conn_weird`
  `partial_finger_request`
    Events handled by `conn_weird`
  `partial_ftp_request`
    Events handled by `conn_weird`
  `partial_ident_request`
    Events handled by `conn_weird`
  `partial_portmapper_request`
    Events handled by `conn_weird`
  `partial_RPC`
    Events handled by `conn_weird`
  `pending_data_when_closed`
    Events handled by `conn_weird`
  `possible_split_routing`
    Events handled by `conn_weird`
  `premature_connection_reuse`
    Events handled by `conn_weird`
  `repeated_SYN_reply_wo_ack`
    Events handled by `conn_weird`
  `repeated_SYN_with_ack`
    Events handled by `conn_weird`
  `responder_RPC_call`
    Events handled by `conn_weird`
  `rlogin_text_after_rejected`
    Events handled by `conn_weird`
  `RPC_rexmit_inconsistency`
    Events handled by `conn_weird`
  `RST_storm`
    Events handled by `conn_weird`
  `RST_with_data`
    Events handled by `conn_weird`
  `simultaneous_open`
    Events handled by `conn_weird`
  `spontaneous_FIN`
    Events handled by `conn_weird`
  `spontaneous_RST`
    Events handled by `conn_weird`
  `SYN_after_close`
    Events handled by `conn_weird`
  `SYN_after_partial`
    Events handled by `conn_weird`
  `SYN_after_reset`
    Events handled by `conn_weird`
  `SYN_inside_connection`
    Events handled by `conn_weird`
  `SYN_seq_jump`
    Events handled by `conn_weird`
  `SYN_with_data`
    Events handled by `conn_weird`
  `TCP_christmas`
    Events handled by `conn_weird`
  `truncated_header`
    Events handled by `net_weird`
  `truncated_IP`
    Events handled by `net_weird`
  `UDP_datagram_length_mismatch`
    Events handled by `conn_weird`
  `unpaired_RPC_response`
    Events handled by `conn_weird`
  `unsolicited_SYN_response`
    Events handled by `conn_weird`
`weird` event summary file
  The `weird` Module
weird events
  The `weird` Module to Additional handlers for ``weird''
  actions
    Actions for ``weird'' events
  additional handlers
    Additional handlers for ``weird''
  generated by standard scripts
    Events generated by the
  handled by `conn_weird`
    Events handled by `conn_weird`
  handled by `conn_weird_addl`
    Events handled by `conn_weird_addl`
  handled by `flow_weird`
    Events handled by `flow_weird`
  handled by `net_weird`
    Events handled by `net_weird`
  prevalence in actual network traffic
    The `weird` Module
`weird` module
  The `weird` Module
`weird_action` variable
  `weird` variables
`weird_action_filters` variable
  `weird` variables
`weird_do_not_ignore_repeats` variable
  `weird` variables
`WEIRD_FILE` action
  Actions for ``weird'' events
`WEIRD_IGNORE` action
  Actions for ``weird'' events
`weird_ignore_host` variable
  `weird` variables
`WEIRD_LOG_ALWAYS` action
  Actions for ``weird'' events
`WEIRD_LOG_ONCE` action
  Actions for ``weird'' events
`WEIRD_LOG_PER_CONN` action
  Actions for ``weird'' events
`WEIRD_LOG_PER_ORIG` action
  Actions for ``weird'' events
`WEIRD_UNSPECIFIED` action
  Actions for ``weird'' events
whitespace
  in statements
    Statements
width
  of formatted strings
    Predefined Functions
Windows
  not supported
    Supported platforms
write file
  control over what's recorded
    Predefined Functions
`&write_expire` attribute
  Table Attributes
writing `tcpdump` files
  Flags
`wrong number of fmt arguments`
  Predefined Functions
wrong number of fmt arguments
  run-time error
    Predefined Functions
wrong number of length arguments
  run-time error
    Predefined Functions
www.anticode.com
  `login` variables
`wwwroot` sensitive POST URI
  `http` variables
yield
  of a table
    Tables
ypserv
  `portmapper` variables