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pflogd (8)
  • >> pflogd (8) ( FreeBSD man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    pflogd
    
     - packet filter logging daemon
    
     
    

    SYNOPSIS

    pflogd [-Dx [-d delay ] ] [-f filename ] [-i interface ] [-s snaplen ] [expression ]  

    DESCRIPTION

    pflogd is a background daemon which reads packets logged by pf(4) to a pflog(4) interface, normally pflog0 and writes the packets to a logfile (normally /var/log/pflog in tcpdump(1) binary format. These logs can be reviewed later using the -r option of tcpdump(1), hopefully offline in case there are bugs in the packet parsing code of tcpdump(1).

    pflogd closes and then re-opens the log file when it receives SIGHUP permitting newsyslog(8) to rotate logfiles automatically. SIGALRM causes pflogd to flush the current logfile buffers to the disk, thus making the most recent logs available. The buffers are also flushed every delay seconds.

    If the log file contains data after a restart or a SIGHUP new logs are appended to the existing file. If the existing log file was created with a different snaplen, pflogd temporarily uses the old snaplen to keep the log file consistent.

    pflogd tries to preserve the integrity of the log file against I/O errors. Furthermore, integrity of an existing log file is verified before appending. If there is an invalid log file or an I/O error, the log file is moved out of the way and a new one is created. If a new file cannot be created, logging is suspended until a SIGHUP or a SIGALRM is received.

    The options are as follows:

    -D
    Debugging mode. pflogd does not disassociate from the controlling terminal.
    -d delay
    Time in seconds to delay between automatic flushes of the file. This may be specified with a value between 5 and 3600 seconds. If not specified, the default is 60 seconds.
    -f filename
    Log output filename. Default is /var/log/pflog
    -i interface
    Specifies the pflog(4) interface to use. By default, pflogd will use pflog0
    -s snaplen
    Analyze at most the first snaplen bytes of data from each packet rather than the default of 116. The default of 116 is adequate for IP, ICMP, TCP, and UDP headers but may truncate protocol information for other protocols. Other file parsers may desire a higher snaplen.
    -x
    Check the integrity of an existing log file, and return.
    expression
    Selects which packets will be dumped, using the regular language of tcpdump(1).

     

    FILES

    /var/run/pflogd.pid
    Process ID of the currently running .
    /var/log/pflog
    Default log file.

     

    EXAMPLES

    Log specific tcp packets to a different log file with a large snaplen (useful with a log-all rule to dump complete sessions):
    # pflogd -s 1600 -f suspicious.log port 80 and host evilhost
    

    Log from another pflog(4) interface, excluding specific packets:

    # pflogd -i pflog3 -f network3.log "not (tcp and port 23)"
    

    Display binary logs:

    # tcpdump -n -e -ttt -r /var/log/pflog
    

    Display the logs in real time (this does not interfere with the operation of )

    # tcpdump -n -e -ttt -i pflog0
    

    Tcpdump has been extended to be able to filter on the pfloghdr structure defined in Aq Ar net/if_pflog.h . Tcpdump can restrict the output to packets logged on a specified interface, a rule number, a reason, a direction, an IP family or an action.

    ip
    Address family equals IPv4.
    ip6
    Address family equals IPv6.
    ifname kue0
    Interface name equals "kue0".
    on kue0
    Interface name equals "kue0".
    ruleset authpf
    Ruleset name equals "authpf".
    rulenum 10
    Rule number equals 10.
    reason match
    Reason equals match. Also accepts "bad-offset", "fragment", "bad-timestamp", "short", "normalize", "memory", "congestion", "ip-option", "proto-cksum", "state-mismatch", "state-insert", "state-limit", "src-limit", and "synproxy".
    action pass
    Action equals pass. Also accepts "block".
    inbound
    The direction was inbound.
    outbound
    The direction was outbound.

    Display the logs in real time of inbound packets that were blocked on the wi0 interface:

    # tcpdump -n -e -ttt -i pflog0 inbound and action block and on wi0
    
     

    SEE ALSO

    tcpdump(1), pcap(3), pf(4), pflog(4), pf.conf5, newsyslog(8)  

    HISTORY

    The pflogd command appeared in Ox 3.0 .  

    AUTHORS

    pflogd was written by An Can Erkin Acar Aq canacar@openbsd.org .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    FILES
    EXAMPLES
    SEE ALSO
    HISTORY
    AUTHORS


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