1 .\" $OpenBSD: pflogd.8,v 1.24 2004/01/16 10:45:49 jmc Exp $
2 .\" $DragonFly: src/usr.sbin/pflogd/pflogd.8,v 1.5 2007/07/29 17:27:46 swildner Exp $
4 .\" Copyright (c) 2001 Can Erkin Acar. All rights reserved.
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33 .Nd packet filter logging daemon
43 is a background daemon which reads packets logged by
45 to the packet logging interface
47 and writes the packets to a logfile (normally
52 These logs can be reviewed later using the
56 hopefully offline in case there are bugs in the packet parsing code of
60 closes and then re-opens the log file when it receives
64 to rotate logfiles automatically.
68 to flush the current logfile buffers to the disk, thus making the most
69 recent logs available.
70 The buffers are also flushed every
74 If the log file contains data after a restart or a
76 new logs are appended to the existing file.
77 If the existing log file was created with a different snaplen,
79 temporarily uses the old snaplen to keep the log file consistent.
82 tries to preserve the integrity of the log file against I/O errors.
83 Furthermore, integrity of an existing log file is verified before
85 If there is an invalid log file or an I/O error, logging is suspended until a
91 The options are as follows:
96 does not disassociate from the controlling terminal.
98 Time in seconds to delay between automatic flushes of the file.
99 This may be specified with a value between 5 and 3600 seconds.
100 If not specified, the default is 60 seconds.
106 Analyze at most the first
108 bytes of data from each packet rather than the default of 96.
109 The default of 96 is adequate for IP, ICMP, TCP, and UDP headers but may
110 truncate protocol information for other protocols.
111 Other file parsers may desire a higher snaplen.
113 Check the integrity of an existing log file, and return.
115 Selects which packets will be dumped, using the regular language of
119 .Bl -tag -width /var/run/pflogd.pid -compact
120 .It Pa /var/run/pflogd.pid
121 Process ID of the currently running
123 .It Pa /var/log/pflog
127 Log specific tcp packets to a different log file with a large snaplen
128 (useful with a log-all rule to dump complete sessions):
129 .Bd -literal -offset indent
130 # pflogd -s 1600 -f suspicious.log port 80 and host evilhost
134 .Bd -literal -offset indent
135 # tcpdump -n -e -ttt -r /var/log/pflog
138 Display the logs in real time (this does not interfere with the
141 .Bd -literal -offset indent
142 # tcpdump -n -e -ttt -i pflog0
145 Tcpdump has been extended to be able to filter on the pfloghdr
147 .In net/pf/if_pflog.h .
148 Tcpdump can restrict the output
149 to packets logged on a specified interface, a rule number, a reason,
150 a direction, an IP family or an action.
152 .Bl -tag -width "reason match " -compact
154 Address family equals IPv4.
156 Address family equals IPv6.
158 Interface name equals "kue0".
160 Interface name equals "kue0".
162 Rule number equals 10.
165 Also accepts "bad-offset", "fragment", "short", "normalize" and "memory".
168 Also accepts "block".
170 The direction was inbound.
172 The direction was outbound.
175 Display the logs in real time of inbound packets that were blocked on
177 .Bd -literal -offset indent
178 # tcpdump -n -e -ttt -i pflog0 inbound and action block and on wi0