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#ifdef __cplusplus
extern "C" {
#endif
#include <getopt.h>
#include <pcap/pcap.h>
#include "MESA_jump_layer.h"
static pcap_t *g_pcap_handle;
static char *g_input_pcap_name;
static char *g_input_bpf_string;
static struct bpf_program g_bpf_filter;
static int g_raw_input_layer_type = (int )ADDR_TYPE_MAC;
static int g_expect_layer_type = (int )ADDR_TYPE_IPV4;
static void usage(const char *prog)
{
printf("Usage:\n");
printf("\t-r set input pcap file.\n");
printf("\t-f set pcap BPF fileter.\n");
exit(0);
}
static int pcap_set_bpf(pcap_t *handle, const char *filter_str)
{
struct bpf_program bpf_filter;
if((NULL == handle) || (NULL == filter_str) || ('\0' == *filter_str)){
return 0;
}
if(pcap_compile(handle, &bpf_filter, (char *)filter_str, 1, 0) < 0)
{
printf("Compile pcap filter '%s' error:%s\n", filter_str, pcap_geterr(handle));
return -1;
}
if(pcap_setfilter(handle, &bpf_filter) < 0){
printf("Set pcap filter '%s' error:%s\n", filter_str, pcap_geterr(handle));
return -1;
}
return 0;
}
static int pcap_init(void)
{
char err_string[PCAP_ERRBUF_SIZE];
g_pcap_handle = pcap_open_offline(g_input_pcap_name, err_string);
if(NULL == g_pcap_handle){
printf("open file:%s error, %s\n", g_input_pcap_name, err_string);
return -1;
}
if(pcap_compile_nopcap(65535, DLT_RAW, &g_bpf_filter, g_input_bpf_string, 1, 0) < 0){
printf("Compile pcap filter '%s' error\n", g_input_bpf_string);
return -1;
}
return 0;
}
static void _jump_from_udp(const void *uhdr)
{
const void *next_hdr;
next_hdr = MESA_jump_layer(uhdr, ADDR_TYPE_UDP, ADDR_TYPE_GPRS_TUNNEL);
if(next_hdr){
printf("bingo! jump to gtp from udp succ!\n");
}
next_hdr = MESA_jump_layer(uhdr, ADDR_TYPE_UDP, ADDR_TYPE_L2TP);
if(next_hdr){
printf("bingo! jump to l2tp from udp succ!\n");
}
}
static void _jump_from_ipv4(const void *ip4_hdr)
{
const void *next_hdr;
next_hdr = MESA_jump_layer(ip4_hdr, ADDR_TYPE_IPV4, ADDR_TYPE_TCP);
if(next_hdr){
printf("bingo! jump to tcp from ipv4 succ!\n");
}
next_hdr = MESA_jump_layer(ip4_hdr, ADDR_TYPE_IPV4, ADDR_TYPE_UDP);
if(next_hdr){
printf("bingo! jump to udp from ipv4 succ!\n");
_jump_from_udp(next_hdr);
}
}
static void _jump_from_ipv6(const void *ip4_hdr)
{
}
static void _jump_from_ethernet(const void *ehdr)
{
const void *next_hdr;
next_hdr = MESA_jump_layer(ehdr, ADDR_TYPE_MAC, ADDR_TYPE_IPV4);
if(next_hdr){
printf("bingo! jump to ipv4 from ethernet succ!\n");
_jump_from_ipv4(next_hdr);
}
next_hdr = MESA_jump_layer(ehdr, ADDR_TYPE_MAC, ADDR_TYPE_IPV6);
if(next_hdr){
printf("bingo! jump to ipv6 from ethernet succ!\n");
_jump_from_ipv6(next_hdr);
}
}
static void _jump_greedy(const struct pcap_pkthdr *hdr, const u_char *data)
{
const void *ip4_hdr, *ip6_h;
char print_buf[128];
int offset_to_eth;
static int pkt_index = 0;
ip4_hdr = MESA_jump_layer_greedy(data, ADDR_TYPE_MAC, ADDR_TYPE_IPV4);
ip6_h = MESA_jump_layer_greedy(data, ADDR_TYPE_MAC, ADDR_TYPE_IPV6);
printf("-----------------------------packet index:%d------------------------------------------\n", pkt_index++);
if(ip4_hdr){
offset_to_eth = (u_char *)ip4_hdr-data;
if(g_input_bpf_string
&& (0 == bpf_filter(g_bpf_filter.bf_insns, (const unsigned char *)ip4_hdr, hdr->caplen-offset_to_eth, hdr->caplen-offset_to_eth))){
goto done;
}
printf("Innermost layer ipv4 offset:%d, addr: %s\n", offset_to_eth, MESA_jump_layer_ipv4_ntop((struct ip *)ip4_hdr, print_buf, sizeof(print_buf)));
}
if(ip6_h){
offset_to_eth = (u_char *)ip6_h-data;
if(g_input_bpf_string
&& (0 == bpf_filter(g_bpf_filter.bf_insns, (const unsigned char *)ip6_h, hdr->caplen-offset_to_eth, hdr->caplen-offset_to_eth))){
goto done;
}
printf("Innermost layer ipv6 offset:%d, addr: %s\n", offset_to_eth, MESA_jump_layer_ipv6_ntop((struct ip6_hdr *)ip6_h, print_buf, sizeof(print_buf)));
}
done:
printf("--------------------------------------------------------------------------------------\n\n");
}
static void _pcap_pkt_handle(u_char *user, const struct pcap_pkthdr *hdr, const u_char *data)
{
_jump_from_ethernet(data);
_jump_greedy(hdr, data);
}
static void pcap_run(void)
{
pcap_loop(g_pcap_handle, -1, _pcap_pkt_handle, NULL);
}
int main(int argc, char *argv[])
{
int ret, c, opt_index;
while(1){
c = getopt_long(argc, argv, "hr:f:", NULL, &opt_index);
if(c == -1){
ret = 0;
break;
}
switch(c){
case 'h':
usage(argv[0]);
break;
case 'r':
g_input_pcap_name = strdup(optarg);
break;
case 'f':
g_input_bpf_string = strdup(optarg);
break;
default:
return -1;
}
}
if(NULL == g_input_pcap_name){
printf("error! must set pcap file name use -r\n");
return -1;
}
if(NULL == g_input_bpf_string){
printf("you can set BPF filter use -f\n");
}
if(pcap_init() < 0){
return -1;
}
pcap_run();
return 0;
}
#ifdef __cplusplus
}
#endif
|
