src/dissector.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2009, 2010, 2011, 2012 Daniel Borkmann.
   5  * Subject to the GPL, version 2.
   6  */
   7
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11
  12 #include "built_in.h"
  13 #include "tprintf.h"
  14 #include "pkt_buff.h"
  15 #include "proto_struct.h"
  16 #define __without_ops
  17 #include "proto_none.h"
  18 #include "dissector.h"
  19 #include "dissector_eth.h"
  20
  21 int dissector_set_print_type(void *ptr, int type)
  22 {
  23         struct protocol *proto;
  24
  25         for (proto = (struct protocol *) ptr; proto; proto = proto->next) {
  26                 switch (type) {
  27                 case FNTTYPE_PRINT_NORM:
  28                         proto->process = proto->print_full;
  29                         break;
  30                 case FNTTYPE_PRINT_LESS:
  31                         proto->process = proto->print_less;
  32                         break;
  33                 case FNTTYPE_PRINT_HEX:
  34                 case FNTTYPE_PRINT_ASCII:
  35                 case FNTTYPE_PRINT_HEX_ASCII:
  36                 case FNTTYPE_PRINT_NONE:
  37                 default:
  38                         proto->process = NULL;
  39                         break;
  40                 }
  41         }
  42
  43         return 0;
  44 }
  45
  46 static void dissector_main(struct pkt_buff *pkt, struct protocol *start,
  47                            struct protocol *end)
  48 {
  49         struct protocol *proto;
  50
  51         for (pkt->proto = start; pkt->proto; ) {
  52                 if (unlikely(!pkt->proto->process))
  53                         break;
  54
  55                 proto = pkt->proto;
  56                 pkt->proto = NULL;
  57                 proto->process(pkt);
  58         }
  59
  60         if (end && likely(end->process))
  61                 end->process(pkt);
  62 }
  63
  64 void dissector_entry_point(uint8_t *packet, size_t len, int linktype, int mode)
  65 {
  66         struct protocol *proto_start = NULL;
  67         struct protocol *proto_end = NULL;
  68         struct pkt_buff *pkt = NULL;
  69
  70         if (mode == FNTTYPE_PRINT_NONE)
  71                 return;
  72
  73         pkt = pkt_alloc(packet, len);
  74
  75         switch (linktype) {
  76         case LINKTYPE_EN10MB:
  77                 proto_start = dissector_get_ethernet_entry_point();
  78                 proto_end = dissector_get_ethernet_exit_point();
  79                 break;
  80         default:
  81                 panic("Linktype not supported!\n");
  82         };
  83
  84         dissector_main(pkt, proto_start, proto_end);
  85
  86         switch (mode) {
  87         case FNTTYPE_PRINT_HEX:
  88                 hex(pkt);
  89                 break;
  90         case FNTTYPE_PRINT_ASCII:
  91                 ascii(pkt);
  92                 break;
  93         case FNTTYPE_PRINT_HEX_ASCII:
  94                 hex_ascii(pkt);
  95                 break;
  96         }
  97
  98         tprintf_flush();
  99         pkt_free(pkt);
 100 }
 101
 102 void dissector_init_all(int fnttype)
 103 {
 104         dissector_init_ethernet(fnttype);
 105 }
 106
 107 void dissector_cleanup_all(void)
 108 {
 109         dissector_cleanup_ethernet();
 110 }