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 "built_in.h"
  16 #include "pkt_buff.h"
  17
  18 struct esp_hdr {
  19         uint32_t h_spi;
  20         uint32_t h_sn;
  21 } __packed;
  22
  23 static void esp(struct pkt_buff *pkt)
  24 {
  25         struct esp_hdr *esp_ops;
  26
  27         esp_ops = (struct esp_hdr *) pkt_pull(pkt, sizeof(*esp_ops));
  28         if (esp_ops == NULL)
  29                 return;
  30
  31         tprintf(" [ ESP ");
  32         tprintf("SPI (0x%x), ", ntohl(esp_ops->h_spi));
  33         tprintf("SN (0x%x)", ntohl(esp_ops->h_sn));
  34         tprintf(" ]\n");
  35 }
  36
  37 static void esp_less(struct pkt_buff *pkt)
  38 {
  39         struct esp_hdr *esp_ops;
  40
  41         esp_ops = (struct esp_hdr *) pkt_pull(pkt, sizeof(*esp_ops));
  42         if (esp_ops == NULL)
  43                 return;
  44
  45         tprintf(" ESP");
  46 }
  47
  48 struct protocol ip_esp_ops = {
  49         .key = 0x32,
  50         .print_full = esp,
  51         .print_less = esp_less,
  52 };