contrib/ipfilter/lib/printpacket.c

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