contrib/ipfilter/lib/printpacket.c

   1 /*      $FreeBSD$       */
   2
   3 /*
   4  * Copyright (C) 2000-2005 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * $Id: printpacket.c,v 1.12.4.5 2007/09/09 22:15:30 darrenr Exp $
   9  */
  10
  11 #include "ipf.h"
  12
  13 #ifndef IP_OFFMASK
  14 # define        IP_OFFMASK      0x3fff
  15 #endif
  16
  17
  18 void printpacket(ip)
  19 struct ip *ip;
  20 {
  21         struct  tcphdr  *tcp;
  22         u_short len;
  23         u_short off;
  24
  25         if (IP_V(ip) == 6) {
  26                 off = 0;
  27                 len = ntohs(((u_short *)ip)[2]) + 40;
  28         } else {
  29                 off = ntohs(ip->ip_off);
  30                 len = ntohs(ip->ip_len);
  31         }
  32
  33         if ((opts & OPT_HEX) == OPT_HEX) {
  34                 u_char *s;
  35                 int i;
  36
  37                 for (s = (u_char *)ip, i = 0; i < len; i++) {
  38                         printf("%02x", *s++ & 0xff);
  39                         if (len - i > 1) {
  40                                 i++;
  41                                 printf("%02x", *s++ & 0xff);
  42                         }
  43                         putchar(' ');
  44                 }
  45                 putchar('\n');
  46                 putchar('\n');
  47                 return;
  48         }
  49
  50         if (IP_V(ip) == 6) {
  51                 printpacket6(ip);
  52                 return;
  53         }
  54
  55         tcp = (struct tcphdr *)((char *)ip + (IP_HL(ip) << 2));
  56         printf("ip #%d %d(%d) %d", ntohs(ip->ip_id), ntohs(ip->ip_len),
  57                IP_HL(ip) << 2, ip->ip_p);
  58         if (off & IP_OFFMASK)
  59                 printf(" @%d", (off & IP_OFFMASK) << 3);
  60         printf(" %s", inet_ntoa(ip->ip_src));
  61         if (!(off & IP_OFFMASK))
  62                 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
  63                         printf(",%d", ntohs(tcp->th_sport));
  64         printf(" > ");
  65         printf("%s", inet_ntoa(ip->ip_dst));
  66         if (!(off & IP_OFFMASK)) {
  67                 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
  68                         printf(",%d", ntohs(tcp->th_dport));
  69                 if ((ip->ip_p == IPPROTO_TCP) && (tcp->th_flags != 0)) {
  70                         putchar(' ');
  71                         if (tcp->th_flags & TH_FIN)
  72                                 putchar('F');
  73                         if (tcp->th_flags & TH_SYN)
  74                                 putchar('S');
  75                         if (tcp->th_flags & TH_RST)
  76                                 putchar('R');
  77                         if (tcp->th_flags & TH_PUSH)
  78                                 putchar('P');
  79                         if (tcp->th_flags & TH_ACK)
  80                                 putchar('A');
  81                         if (tcp->th_flags & TH_URG)
  82                                 putchar('U');
  83                         if (tcp->th_flags & TH_ECN)
  84                                 putchar('E');
  85                         if (tcp->th_flags & TH_CWR)
  86                                 putchar('C');
  87                 }
  88         }
  89
  90         putchar('\n');
  91 }