diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 2001-08-23 04:06:13 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 2001-08-23 04:06:13 +0000 |
| commit | e9f39b4619674bae96bc058768eb1a8d84e4f746 (patch) | |
| tree | 6cc389b46db090e8872287404b3d4fbbdb5b06d8 /sbin/pflogd | |
| parent | d6a2e7898240409a30abca2a2b99c4cbca6968c1 (diff) | |
do not permit snaplen change on an active log file
Diffstat (limited to 'sbin/pflogd')
| -rw-r--r-- | sbin/pflogd/pflogd.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/sbin/pflogd/pflogd.c b/sbin/pflogd/pflogd.c index d9c00d97ebb..8ddfa5f47cb 100644 --- a/sbin/pflogd/pflogd.c +++ b/sbin/pflogd/pflogd.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pflogd.c,v 1.2 2001/08/22 14:49:37 deraadt Exp $ */ +/* $OpenBSD: pflogd.c,v 1.3 2001/08/23 04:06:12 deraadt Exp $ */ /* * Copyright (c) 2001 Theo de Raadt @@ -175,6 +175,26 @@ reset_dump(void) return (0); #define TCPDUMP_MAGIC 0xa1b2c3d4 + + /* + * XXX Must read the file, compare the header against our new + * options (in particular, snaplen) and adjust our options so + * that we generate a correct file. + */ + (void) fseek(fp, 0L, SEEK_SET); + if (fread((char *)&hdr, sizeof(hdr), 1, fp) == 1) { + if (hdr.magic == TCPDUMP_MAGIC && + hdr.version_major == PCAP_VERSION_MAJOR && + hdr.version_minor == PCAP_VERSION_MINOR && + hdr.snaplen != snaplen) { + logmsg(LOG_WARNING, + "Existing file specifies a snaplen of %d, using it", + hdr.snaplen); + snaplen = hdr.snaplen; + } + } + (void) fseek(fp, 0L, SEEK_END); + hdr.magic = TCPDUMP_MAGIC; hdr.version_major = PCAP_VERSION_MAJOR; hdr.version_minor = PCAP_VERSION_MINOR; |