diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 1998-11-10 22:04:12 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 1998-11-10 22:04:12 +0000 |
| commit | fdecfc31b41321f306854cbb78a2837dbf3f3231 (patch) | |
| tree | c120bf0a373da9b5bfe8498de83c6aa67fbb4213 /usr.sbin | |
| parent | 72129b4edd909dbf93cfdf5b7aae28e30cc81e19 (diff) | |
hash & cache hostnames; garath@code.ridgefield.org
Diffstat (limited to 'usr.sbin')
| -rw-r--r-- | usr.sbin/ipmon/ipmon.c | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/usr.sbin/ipmon/ipmon.c b/usr.sbin/ipmon/ipmon.c index b8a33689b63..1de66b4a01d 100644 --- a/usr.sbin/ipmon/ipmon.c +++ b/usr.sbin/ipmon/ipmon.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ipmon.c,v 1.15 1998/10/29 02:15:21 deraadt Exp $ +/* $OpenBSD: ipmon.c,v 1.16 1998/11/10 22:04:11 deraadt Exp $ * Copyright (C) 1993-1997 by Darren Reed. * * Redistribution and use in source and binary forms are permitted @@ -7,7 +7,7 @@ */ #if !defined(lint) static const char sccsid[] = "@(#)ipmon.c 1.21 6/5/96 (C)1993-1997 Darren Reed"; -static const char rcsid[] = "@(#)$Id: ipmon.c,v 1.15 1998/10/29 02:15:21 deraadt Exp $"; +static const char rcsid[] = "@(#)$Id: ipmon.c,v 1.16 1998/11/10 22:04:11 deraadt Exp $"; #endif #include <stdio.h> @@ -88,6 +88,13 @@ struct flags tcpfl[] = { { 0, '\0' } }; +struct hlist { + struct hlist *next; + struct in_addr addr; + char name[MAXHOSTNAMELEN]; +}; +#define PRIME 367 +static struct hlist htable[PRIME]; static char line[2048]; static int opts = 0; @@ -160,13 +167,30 @@ int res; struct in_addr ip; { struct hostent *hp; + struct hlist *hl; if (!res) return inet_ntoa(ip); + + hl = &htable[ip.s_addr % PRIME]; + for ( ; hl->next != NULL; hl = hl->next) + if (hl->addr.s_addr == ip.s_addr) + return hl->name; + + hl->addr.s_addr = ip.s_addr; + hl->next = (struct hlist *)calloc(1, sizeof(*hl)); + if (hl->next == NULL) { + perror("calloc"); + exit(1); + } + hp = gethostbyaddr((char *)&ip, sizeof(ip), AF_INET); if (!hp) - return inet_ntoa(ip); - return hp->h_name; + strlcpy(hl->name, inet_ntoa(ip), sizeof hl->name); + else + strlcpy(hl->name, hp->h_name, sizeof hl->name); + + return hl->name; } |