proto_ip_esp.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * Copyright 2012 Markus Amend <markus@netsniff-ng.org>, Deutsche Flugsicherung GmbH
   4  * Subject to the GPL, version 2.
   5  *
   6  * Encapsulating Security Payload described in RFC4303
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdint.h>
  11 #include <netinet/in.h>    /* for ntohs() */
  12
  13 #include "proto.h"
  14 #include "protos.h"
  15 #include "dissector_eth.h"
  16 #include "built_in.h"
  17 #include "pkt_buff.h"
  18
  19 struct esp_hdr {
  20         uint32_t h_spi;
  21         uint32_t h_sn;
  22 } __packed;
  23
  24 static void esp(struct pkt_buff *pkt)
  25 {
  26         struct esp_hdr *esp_ops;
  27
  28         esp_ops = (struct esp_hdr *) pkt_pull(pkt, sizeof(*esp_ops));
  29         if (esp_ops == NULL)
  30                 return;
  31
  32         tprintf(" [ ESP ");
  33         tprintf("SPI (0x%x), ", ntohl(esp_ops->h_spi));
  34         tprintf("SN (0x%x)", ntohl(esp_ops->h_sn));
  35         tprintf(" ]\n");
  36 }
  37
  38 static void esp_less(struct pkt_buff *pkt)
  39 {
  40         struct esp_hdr *esp_ops;
  41
  42         esp_ops = (struct esp_hdr *) pkt_pull(pkt, sizeof(*esp_ops));
  43         if (esp_ops == NULL)
  44                 return;
  45
  46         tprintf(" ESP");
  47 }
  48
  49 struct protocol ip_esp_ops = {
  50         .key = 0x32,
  51         .print_full = esp,
  52         .print_less = esp_less,
  53 };