86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/* $NetBSD: printpacket.c,v 1.1.1.1 2004/03/28 08:56:20 martti Exp $ */
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/*
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* Copyright (C) 1993-2001 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* Id: printpacket.c,v 1.12 2002/11/02 13:27:29 darrenr Exp
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*/
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#include "ipf.h"
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#ifndef IP_OFFMASK
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# define IP_OFFMASK 0x3fff
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#endif
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void printpacket(ip)
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struct ip *ip;
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{
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struct tcphdr *tcp;
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u_short len;
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if (IP_V(ip) == 6)
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len = ntohs(((u_short *)ip)[2]) + 40;
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else
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len = ntohs(ip->ip_len);
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if ((opts & OPT_HEX) == OPT_HEX) {
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u_char *s;
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int i;
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for (s = (u_char *)ip, i = 0; i < len; i++) {
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printf("%02x", *s++ & 0xff);
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if (len - i > 1) {
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i++;
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printf("%02x", *s++ & 0xff);
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}
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putchar(' ');
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}
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putchar('\n');
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return;
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}
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if (IP_V(ip) == 6) {
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printpacket6(ip);
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return;
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}
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tcp = (struct tcphdr *)((char *)ip + (IP_HL(ip) << 2));
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printf("ip %d(%d) %d", ntohs(ip->ip_len), IP_HL(ip) << 2, ip->ip_p);
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if (ip->ip_off & IP_OFFMASK)
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printf(" @%d", ip->ip_off << 3);
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printf(" %s", inet_ntoa(ip->ip_src));
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if (!(ip->ip_off & IP_OFFMASK))
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if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
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printf(",%d", ntohs(tcp->th_sport));
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printf(" > ");
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printf("%s", inet_ntoa(ip->ip_dst));
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if (!(ip->ip_off & IP_OFFMASK)) {
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if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
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printf(",%d", ntohs(tcp->th_dport));
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if ((ip->ip_p == IPPROTO_TCP) && (tcp->th_flags != 0)) {
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putchar(' ');
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if (tcp->th_flags & TH_FIN)
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putchar('F');
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if (tcp->th_flags & TH_SYN)
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putchar('S');
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if (tcp->th_flags & TH_RST)
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putchar('R');
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if (tcp->th_flags & TH_PUSH)
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putchar('P');
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if (tcp->th_flags & TH_ACK)
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putchar('A');
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if (tcp->th_flags & TH_URG)
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putchar('U');
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if (tcp->th_flags & TH_ECN)
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putchar('E');
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if (tcp->th_flags & TH_CWR)
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putchar('C');
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}
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}
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putchar('\n');
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}
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