1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Copyright (C) 1993-2001 by Darren Reed. 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * See the IPFILTER.LICENCE file for details on licencing. 5*0Sstevel@tonic-gate * 6*0Sstevel@tonic-gate * $Id: ipft_td.c,v 1.11 2003/06/03 16:01:01 darrenr Exp $ 7*0Sstevel@tonic-gate */ 8*0Sstevel@tonic-gate 9*0Sstevel@tonic-gate /* 10*0Sstevel@tonic-gate tcpdump -n 11*0Sstevel@tonic-gate 12*0Sstevel@tonic-gate 00:05:47.816843 128.231.76.76.3291 > 224.2.252.231.36573: udp 36 (encap) 13*0Sstevel@tonic-gate 14*0Sstevel@tonic-gate tcpdump -nq 15*0Sstevel@tonic-gate 16*0Sstevel@tonic-gate 00:33:48.410771 192.73.213.11.1463 > 224.2.248.153.59360: udp 31 (encap) 17*0Sstevel@tonic-gate 18*0Sstevel@tonic-gate tcpdump -nqt 19*0Sstevel@tonic-gate 20*0Sstevel@tonic-gate 128.250.133.13.23 > 128.250.20.20.2419: tcp 27 21*0Sstevel@tonic-gate 22*0Sstevel@tonic-gate tcpdump -nqtt 23*0Sstevel@tonic-gate 24*0Sstevel@tonic-gate 123456789.1234567 128.250.133.13.23 > 128.250.20.20.2419: tcp 27 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate tcpdump -nqte 27*0Sstevel@tonic-gate 28*0Sstevel@tonic-gate 8:0:20:f:65:f7 0:0:c:1:8a:c5 81: 128.250.133.13.23 > 128.250.20.20.2419: tcp 27 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate */ 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate #include "ipf.h" 33*0Sstevel@tonic-gate #include "ipt.h" 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate #undef ICMP_MAXTYPE 36*0Sstevel@tonic-gate #include <netinet/ip_icmp.h> 37*0Sstevel@tonic-gate #include <netinet/ip_var.h> 38*0Sstevel@tonic-gate #include <netinet/udp.h> 39*0Sstevel@tonic-gate #include <netinet/tcpip.h> 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate 42*0Sstevel@tonic-gate #if !defined(lint) 43*0Sstevel@tonic-gate static const char sccsid[] = "@(#)ipft_td.c 1.8 2/4/96 (C)1995 Darren Reed"; 44*0Sstevel@tonic-gate static const char rcsid[] = "@(#)$Id: ipft_td.c,v 1.11 2003/06/03 16:01:01 darrenr Exp $"; 45*0Sstevel@tonic-gate #endif 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate static int tcpd_open __P((char *)); 48*0Sstevel@tonic-gate static int tcpd_close __P((void)); 49*0Sstevel@tonic-gate static int tcpd_readip __P((char *, int, char **, int *)); 50*0Sstevel@tonic-gate static int count_dots __P((char *)); 51*0Sstevel@tonic-gate 52*0Sstevel@tonic-gate struct ipread tcpd = { tcpd_open, tcpd_close, tcpd_readip, 0 }; 53*0Sstevel@tonic-gate 54*0Sstevel@tonic-gate static FILE *tfp = NULL; 55*0Sstevel@tonic-gate static int tfd = -1; 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate 58*0Sstevel@tonic-gate static int tcpd_open(fname) 59*0Sstevel@tonic-gate char *fname; 60*0Sstevel@tonic-gate { 61*0Sstevel@tonic-gate if (tfd != -1) 62*0Sstevel@tonic-gate return tfd; 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate if (!strcmp(fname, "-")) { 65*0Sstevel@tonic-gate tfd = 0; 66*0Sstevel@tonic-gate tfp = stdin; 67*0Sstevel@tonic-gate } else { 68*0Sstevel@tonic-gate tfd = open(fname, O_RDONLY); 69*0Sstevel@tonic-gate tfp = fdopen(tfd, "r"); 70*0Sstevel@tonic-gate } 71*0Sstevel@tonic-gate return tfd; 72*0Sstevel@tonic-gate } 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate 75*0Sstevel@tonic-gate static int tcpd_close() 76*0Sstevel@tonic-gate { 77*0Sstevel@tonic-gate (void) fclose(tfp); 78*0Sstevel@tonic-gate return close(tfd); 79*0Sstevel@tonic-gate } 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate 82*0Sstevel@tonic-gate static int count_dots(str) 83*0Sstevel@tonic-gate char *str; 84*0Sstevel@tonic-gate { 85*0Sstevel@tonic-gate int i = 0; 86*0Sstevel@tonic-gate 87*0Sstevel@tonic-gate while (*str) 88*0Sstevel@tonic-gate if (*str++ == '.') 89*0Sstevel@tonic-gate i++; 90*0Sstevel@tonic-gate return i; 91*0Sstevel@tonic-gate } 92*0Sstevel@tonic-gate 93*0Sstevel@tonic-gate 94*0Sstevel@tonic-gate static int tcpd_readip(buf, cnt, ifn, dir) 95*0Sstevel@tonic-gate char *buf, **ifn; 96*0Sstevel@tonic-gate int cnt, *dir; 97*0Sstevel@tonic-gate { 98*0Sstevel@tonic-gate struct tcpiphdr pkt; 99*0Sstevel@tonic-gate ip_t *ip = (ip_t *)&pkt; 100*0Sstevel@tonic-gate struct protoent *p; 101*0Sstevel@tonic-gate char src[32], dst[32], misc[256], time[32], link1[32], link2[32]; 102*0Sstevel@tonic-gate char lbuf[160], *s; 103*0Sstevel@tonic-gate int n, slen, extra = 0; 104*0Sstevel@tonic-gate 105*0Sstevel@tonic-gate if (!fgets(lbuf, sizeof(lbuf) - 1, tfp)) 106*0Sstevel@tonic-gate return 0; 107*0Sstevel@tonic-gate 108*0Sstevel@tonic-gate if ((s = strchr(lbuf, '\n'))) 109*0Sstevel@tonic-gate *s = '\0'; 110*0Sstevel@tonic-gate lbuf[sizeof(lbuf)-1] = '\0'; 111*0Sstevel@tonic-gate 112*0Sstevel@tonic-gate bzero(&pkt, sizeof(pkt)); 113*0Sstevel@tonic-gate 114*0Sstevel@tonic-gate if ((n = sscanf(lbuf, "%31s > %31s: %255s", src, dst, misc)) != 3) 115*0Sstevel@tonic-gate if ((n = sscanf(lbuf, "%31s %31s > %31s: %255s", 116*0Sstevel@tonic-gate time, src, dst, misc)) != 4) 117*0Sstevel@tonic-gate if ((n = sscanf(lbuf, "%31s %31s: %31s > %31s: %255s", 118*0Sstevel@tonic-gate link1, link2, src, dst, misc)) != 5) { 119*0Sstevel@tonic-gate n = sscanf(lbuf, 120*0Sstevel@tonic-gate "%31s %31s %31s: %31s > %31s: %255s", 121*0Sstevel@tonic-gate time, link1, link2, src, dst, misc); 122*0Sstevel@tonic-gate if (n != 6) 123*0Sstevel@tonic-gate return -1; 124*0Sstevel@tonic-gate } 125*0Sstevel@tonic-gate 126*0Sstevel@tonic-gate if (count_dots(dst) == 4) { 127*0Sstevel@tonic-gate s = strrchr(src, '.'); 128*0Sstevel@tonic-gate *s++ = '\0'; 129*0Sstevel@tonic-gate (void) inet_aton(src, &ip->ip_src); 130*0Sstevel@tonic-gate pkt.ti_sport = htons(atoi(s)); 131*0Sstevel@tonic-gate *--s = '.'; 132*0Sstevel@tonic-gate s = strrchr(dst, '.'); 133*0Sstevel@tonic-gate 134*0Sstevel@tonic-gate *s++ = '\0'; 135*0Sstevel@tonic-gate (void) inet_aton(src, &ip->ip_dst); 136*0Sstevel@tonic-gate pkt.ti_dport = htons(atoi(s)); 137*0Sstevel@tonic-gate *--s = '.'; 138*0Sstevel@tonic-gate 139*0Sstevel@tonic-gate } else { 140*0Sstevel@tonic-gate (void) inet_aton(src, &ip->ip_src); 141*0Sstevel@tonic-gate (void) inet_aton(src, &ip->ip_dst); 142*0Sstevel@tonic-gate } 143*0Sstevel@tonic-gate ip->ip_len = sizeof(ip_t); 144*0Sstevel@tonic-gate IP_HL_A(ip, sizeof(ip_t)); 145*0Sstevel@tonic-gate 146*0Sstevel@tonic-gate s = strtok(misc, " :"); 147*0Sstevel@tonic-gate ip->ip_p = getproto(s); 148*0Sstevel@tonic-gate 149*0Sstevel@tonic-gate switch (ip->ip_p) 150*0Sstevel@tonic-gate { 151*0Sstevel@tonic-gate case IPPROTO_TCP : 152*0Sstevel@tonic-gate case IPPROTO_UDP : 153*0Sstevel@tonic-gate s = strtok(NULL, " :"); 154*0Sstevel@tonic-gate ip->ip_len += atoi(s); 155*0Sstevel@tonic-gate if (ip->ip_p == IPPROTO_TCP) 156*0Sstevel@tonic-gate extra = sizeof(struct tcphdr); 157*0Sstevel@tonic-gate else if (ip->ip_p == IPPROTO_UDP) 158*0Sstevel@tonic-gate extra = sizeof(struct udphdr); 159*0Sstevel@tonic-gate break; 160*0Sstevel@tonic-gate #ifdef IGMP 161*0Sstevel@tonic-gate case IPPROTO_IGMP : 162*0Sstevel@tonic-gate extra = sizeof(struct igmp); 163*0Sstevel@tonic-gate break; 164*0Sstevel@tonic-gate #endif 165*0Sstevel@tonic-gate case IPPROTO_ICMP : 166*0Sstevel@tonic-gate extra = sizeof(struct icmp); 167*0Sstevel@tonic-gate break; 168*0Sstevel@tonic-gate default : 169*0Sstevel@tonic-gate break; 170*0Sstevel@tonic-gate } 171*0Sstevel@tonic-gate 172*0Sstevel@tonic-gate slen = IP_HL(ip) + extra + ip->ip_len; 173*0Sstevel@tonic-gate return slen; 174*0Sstevel@tonic-gate } 175