/* $NetBSD: printpacket.c,v 1.2 2012/07/22 14:27:37 darrenr Exp $ */ /* * Copyright (C) 2012 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * Id: printpacket.c,v 1.1.1.2 2012/07/22 13:44:42 darrenr Exp $ */ #include "ipf.h" #ifndef IP_OFFMASK # define IP_OFFMASK 0x3fff #endif void printpacket(dir, m) int dir; mb_t *m; { u_short len, off; tcphdr_t *tcp; ip_t *ip; ip = MTOD(m, ip_t *); if (IP_V(ip) == 6) { #ifdef USE_INET6 len = ntohs(((ip6_t *)ip)->ip6_plen); #else len = ntohs(((u_short *)ip)[2]); #endif len += 40; } else { len = ntohs(ip->ip_len); } ASSERT(len == msgdsize(m)); if ((opts & OPT_HEX) == OPT_HEX) { u_char *s; int i; for (; m != NULL; m = m->mb_next) { len = m->mb_len; for (s = (u_char *)m->mb_data, i = 0; i < len; i++) { PRINTF("%02x", *s++ & 0xff); if (len - i > 1) { i++; PRINTF("%02x", *s++ & 0xff); } putchar(' '); } } putchar('\n'); putchar('\n'); return; } if (IP_V(ip) == 6) { printpacket6(dir, m); return; } if (dir) PRINTF("> "); else PRINTF("< "); PRINTF("%s ", IFNAME(m->mb_ifp)); off = ntohs(ip->ip_off); tcp = (struct tcphdr *)((char *)ip + (IP_HL(ip) << 2)); PRINTF("ip #%d %d(%d) %d", ntohs(ip->ip_id), ntohs(ip->ip_len), IP_HL(ip) << 2, ip->ip_p); if (off & IP_OFFMASK) PRINTF(" @%d", off << 3); PRINTF(" %s", inet_ntoa(ip->ip_src)); if (!(off & IP_OFFMASK)) if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) PRINTF(",%d", ntohs(tcp->th_sport)); PRINTF(" > "); PRINTF("%s", inet_ntoa(ip->ip_dst)); if (!(off & IP_OFFMASK)) { if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) PRINTF(",%d", ntohs(tcp->th_dport)); if ((ip->ip_p == IPPROTO_TCP) && (tcp->th_flags != 0)) { putchar(' '); if (tcp->th_flags & TH_FIN) putchar('F'); if (tcp->th_flags & TH_SYN) putchar('S'); if (tcp->th_flags & TH_RST) putchar('R'); if (tcp->th_flags & TH_PUSH) putchar('P'); if (tcp->th_flags & TH_ACK) putchar('A'); if (tcp->th_flags & TH_URG) putchar('U'); if (tcp->th_flags & TH_ECN) putchar('E'); if (tcp->th_flags & TH_CWR) putchar('C'); } } putchar('\n'); }