/* * Copyright (C) 1993-1998 by Darren Reed. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and due credit is given * to the original author and the contributors. */ #ifdef __FreeBSD__ # include #endif #include #include #include #include #if !defined(__SVR4) && !defined(__svr4__) && !defined(__sgi) #include #else #if !defined(__sgi) #include #endif #include #endif #include #include #include #include #include #include #include #include #include #ifndef linux #include #endif #include #include #include #include #include #if __FreeBSD_version >= 300000 # include #endif #include #include #include #include #include #include "ip_compat.h" #include #include "ip_fil.h" #include "ip_nat.h" #include "ip_state.h" #include "ipf.h" #include "ipt.h" #if !defined(lint) static const char sccsid[] = "@(#)ipt.c 1.19 6/3/96 (C) 1993-1996 Darren Reed"; static const char rcsid[] = "@(#)$Id: ipt.c,v 2.1.2.1 2000/01/24 14:49:11 darrenr Exp $"; #endif extern char *optarg; extern struct frentry *ipfilter[2][2]; extern struct ipread snoop, etherf, tcpd, pcap, iptext, iphex; extern struct ifnet *get_unit __P((char *)); extern void init_ifp __P((void)); extern ipnat_t *natparse __P((char *, int)); extern int fr_running; int opts = 0; int main __P((int, char *[])); int main(argc,argv) int argc; char *argv[]; { struct ipread *r = &iptext; u_long buf[2048]; struct ifnet *ifp; char *rules = NULL, *datain = NULL, *iface = NULL; ip_t *ip; int fd, i, dir = 0, c; while ((c = getopt(argc, argv, "bdEHi:I:NoPr:STvX")) != -1) switch (c) { case 'b' : opts |= OPT_BRIEF; break; case 'd' : opts |= OPT_DEBUG; break; case 'i' : datain = optarg; break; case 'I' : iface = optarg; break; case 'o' : opts |= OPT_SAVEOUT; break; case 'r' : rules = optarg; break; case 'v' : opts |= OPT_VERBOSE; break; case 'E' : r = ðerf; break; case 'H' : r = &iphex; break; case 'N' : opts |= OPT_NAT; break; case 'P' : r = &pcap; break; case 'S' : r = &snoop; break; case 'T' : r = &tcpd; break; case 'X' : r = &iptext; break; } if (!rules) { (void)fprintf(stderr,"no rule file present\n"); exit(-1); } nat_init(); fr_stateinit(); initparse(); fr_running = 1; if (rules) { char line[513], *s; void *fr; FILE *fp; int linenum = 0; if (!strcmp(rules, "-")) fp = stdin; else if (!(fp = fopen(rules, "r"))) { (void)fprintf(stderr, "couldn't open %s\n", rules); exit(-1); } if (!(opts & OPT_BRIEF)) (void)printf("opening rule file \"%s\"\n", rules); while (fgets(line, sizeof(line)-1, fp)) { linenum++; /* * treat both CR and LF as EOL */ if ((s = index(line, '\n'))) *s = '\0'; if ((s = index(line, '\r'))) *s = '\0'; /* * # is comment marker, everything after is a ignored */ if ((s = index(line, '#'))) *s = '\0'; if (!*line) continue; /* fake an `ioctl' call :) */ if ((opts & OPT_NAT) != 0) { if (!(fr = natparse(line, linenum))) continue; i = IPL_EXTERN(ioctl)(IPL_LOGNAT, SIOCADNAT, fr, FWRITE|FREAD); if (opts & OPT_DEBUG) fprintf(stderr, "iplioctl(ADNAT,%p,1) = %d\n", fr, i); } else { if (!(fr = parse(line, linenum))) continue; i = IPL_EXTERN(ioctl)(0, SIOCADDFR, fr, FWRITE|FREAD); if (opts & OPT_DEBUG) fprintf(stderr, "iplioctl(ADDFR,%p,1) = %d\n", fr, i); } } (void)fclose(fp); } if (opts & OPT_SAVEOUT) init_ifp(); if (datain) fd = (*r->r_open)(datain); else fd = (*r->r_open)("-"); if (fd < 0) exit(-1); ip = (ip_t *)buf; while ((i = (*r->r_readip)((char *)buf, sizeof(buf), &iface, &dir)) > 0) { ifp = iface ? get_unit(iface) : NULL; ip->ip_off = ntohs(ip->ip_off); ip->ip_len = ntohs(ip->ip_len); i = fr_check(ip, ip->ip_hl << 2, ifp, dir, (mb_t **)&buf); if ((opts & OPT_NAT) == 0) switch (i) { case -2 : (void)printf("auth"); break; case -1 : (void)printf("block"); break; case 0 : (void)printf("pass"); break; case 1 : (void)printf("nomatch"); break; } if (!(opts & OPT_BRIEF)) { putchar(' '); printpacket((ip_t *)buf); printf("--------------"); } else if ((opts & (OPT_BRIEF|OPT_NAT)) == (OPT_NAT|OPT_BRIEF)) printpacket((ip_t *)buf); #ifndef linux if (dir && ifp && ip->ip_v) # ifdef __sgi (*ifp->if_output)(ifp, (void *)buf, NULL); # else (*ifp->if_output)(ifp, (void *)buf, NULL, 0); # endif #endif if ((opts & (OPT_BRIEF|OPT_NAT)) != (OPT_NAT|OPT_BRIEF)) putchar('\n'); dir = 0; } (*r->r_close)(); return 0; }