feat: add real igmp features
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850c278317
commit
43ef132e2b
1 changed files with 233 additions and 19 deletions
252
src/igmpgen.c
252
src/igmpgen.c
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@ -5,6 +5,8 @@
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#include <libnet.h>
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#include <netinet/igmp.h>
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#define IGMP_V3_MEMBERSHIP_REPORT 0x22
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/* Structure to represent IGMP extra information */
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struct igmp_extra {
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u_int8_t igmp_version;
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@ -21,80 +23,149 @@ struct igmp_extra {
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{ 2, "query", 0x11, 1, "224.0.0.1", 0 },
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{ 2, "report", 0x16, 1, "224.0.0.2", 1 },
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{ 2, "leave", 0x17, 1, "224.0.0.2", 0 },
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{ 3, "report", 0x22, 1, "224.0.0.22", 0 },
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/* Note: end of list (please keep) */
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{ 0, 0, 0, 0 },
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};
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void usage(char *name)
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{
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fprintf(stderr, "usage: %s -i ethdevice -g group -t packet.version\n", name);
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struct igmp_extra *pkt_ptr;
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fprintf(stderr, "usage: %s -i ethdevice -g group -t packet.version [-s ip:port] [-d ip:port]\n", name);
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pkt_ptr = g_igmp_pkts;
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fprintf(stderr,"\nAvailable packet types:\n");
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while(pkt_ptr->igmp_version || pkt_ptr->igmp_tag){
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fprintf(stderr," - %s.%d\n", pkt_ptr->igmp_tag, pkt_ptr->igmp_version);
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pkt_ptr++;
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}
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}
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int main(int argc, char **argv)
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{
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u_int32_t ip_src = 0;
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u_int32_t ip_dst = 0;
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u_int32_t igmp_group = 0;
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char *igmp_group_str = NULL;
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char *ip_src_str = NULL;
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char *ip_dst_str = NULL;
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/* ports */
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u_short src_prt = 3141;
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u_short dst_prt = 5926;
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/* igmp stuff */
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u_char igmp_type = 0;
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u_char igmp_code = 0;
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u_int8_t igmp_version = 0;
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int igmp_override;
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struct igmp_extra *pkt_ptr;
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int ip_src_test = 1;
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int ip_dst_test = 1;
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int igmp_group_test =1;
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/* libnet stuff */
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char neterr[LIBNET_ERRBUF_SIZE];
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libnet_ptag_t ptag;
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libnet_t *netcontext = NULL;
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/* misc */
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int c;
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char *device = NULL;
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u_int8_t igmp_version = 0;
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char *cp = NULL;
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int found = 0;
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struct igmp_extra *pkt_ptr;
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u_char igmp_type = 0;
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u_char igmp_code = 0;
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char *device = "eth0";
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int c;
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char *cp = NULL;
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int found=0;
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printf("IGMP packet generator\n\n");
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printf("Parsing command line...\n");
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while((c = getopt(argc, argv, "i:t:g:")) != EOF)
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while((c = getopt(argc, argv, "i:t:g:d:s:")) != EOF)
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{
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switch (c)
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{
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case 'i':
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printf(" Net interface = [%s]\n", optarg);
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printf(" Net interface = [%s]\n",optarg);
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device = optarg;
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break;
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case 't':
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if (!(cp = strrchr(optarg, '.'))) {
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usage(argv[0]);
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exit(1);
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}
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*cp++ = 0;
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igmp_version = (u_short)atoi(cp);
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pkt_ptr = g_igmp_pkts;
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while (pkt_ptr->igmp_version || pkt_ptr->igmp_tag) {
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while(pkt_ptr->igmp_version || pkt_ptr->igmp_tag){
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if ((strcasecmp(pkt_ptr->igmp_tag, optarg) == 0)
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&& (igmp_version == pkt_ptr->igmp_version)) {
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&& (igmp_version == pkt_ptr->igmp_version)){
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found = 1;
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igmp_type = pkt_ptr->igmp_type;
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igmp_code = pkt_ptr->igmp_code;
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ip_dst_str = pkt_ptr->igmp_dst;
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igmp_override = pkt_ptr->group_override_dst;
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break;
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}
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pkt_ptr++;
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pkt_ptr++;
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}
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if (!found) {
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if (found){
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printf(" Packet = [%s] version [%d]\n", pkt_ptr->igmp_tag, igmp_version);
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} else {
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usage(argv[0]);
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exit(1);
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}
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break;
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case 'g':
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// Group argument handling logic
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printf(" Group = [%s]\n", optarg);
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igmp_group_str = optarg;
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igmp_group_str = optarg;
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break;
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case 'n':
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// delay between packets in sec
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break;
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/*
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* We expect the input to be of the form `ip.ip.ip.ip.port`. We
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* point cp to the last dot of the IP address/port string and
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* then seperate them with a NULL byte. The optarg now points to
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* just the IP address, and cp points to the port.
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*/
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case 'd':
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if ((cp = strrchr(optarg, ':')))
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{
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*cp++ = 0;
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dst_prt = (u_short)atoi(cp);
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} else {
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dst_prt = 0;
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}
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ip_dst_str = strdup(optarg);
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printf(" Destination = ip [%s] port [%d]\n", ip_dst_str, dst_prt);
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break;
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case 's':
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if ((cp = strrchr(optarg, ':')))
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{
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*cp++ = 0;
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src_prt = (u_short)atoi(cp);
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} else {
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src_prt = 0;
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}
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ip_src_str = strdup(optarg);
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printf(" Source = ip [%s] port [%d]\n", ip_src_str, src_prt);
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break;
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default:
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usage(argv[0]);
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exit(1);
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}
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}
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if (!device)
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if (!igmp_group_str || !device)
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{
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usage(argv[0]);
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exit(EXIT_FAILURE);
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@ -120,7 +191,6 @@ int main(int argc, char **argv)
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/* Packet construction: IGMP */
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printf(" Building IGMP content...\n");
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libnet_ptag_t ptag;
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ptag = libnet_build_igmp(
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igmp_type, // IGMP type
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igmp_code, // IGMP code
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@ -146,6 +216,150 @@ int main(int argc, char **argv)
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printf("Packet sent successfully.\n");
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}
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printf("Packet construction...\n");
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/*
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* Packet construction : IGMP
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*/
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printf(" Building IGMP content...\n");
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// Override dest with group info when needed
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if (igmp_override) {
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ip_dst_str = igmp_group_str;
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}
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switch ( igmp_type ) {
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case 0x11: // IGMP_MEMBERSHIP_QUERY
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if (igmp_version == 2){
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// group specific
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} else if (igmp_version == 1) {
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// general
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igmp_group = 0;
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igmp_group_str = "0.0.0.0";
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igmp_group_test = 0;
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}
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// DST = 224.0.0.1
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//igmp_group = 0;
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//igmp_group_test = 0;
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break;
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case 0x12: //
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default:
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break;
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}
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if (ip_src_test
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&& !(ip_src = libnet_name2addr4(netcontext, ip_src_str, LIBNET_RESOLVE)))
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{
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fprintf(stderr,"Bad source IP address: %s\n", ip_src_str);
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fprintf(stderr,"%s\n", libnet_geterror(netcontext));
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exit(1);
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}
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if (ip_dst_test
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&& !(ip_dst = libnet_name2addr4(netcontext, ip_dst_str, LIBNET_RESOLVE)))
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{
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fprintf(stderr,"Bad destination IP address: %s\n", ip_dst_str);
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fprintf(stderr,"%s\n", libnet_geterror(netcontext));
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exit(1);
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}
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if (igmp_group_test && !(igmp_group = libnet_name2addr4(netcontext, igmp_group_str, LIBNET_RESOLVE)))
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{
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fprintf(stderr,"Bad group IP address: %s\n", optarg);
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fprintf(stderr,"%s\n", libnet_geterror(netcontext));
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exit(1);
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}
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printf(" IP SRC IP = %s\n", ip_src_str);
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printf(" IP DEST IP = %s\n", ip_dst_str);
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printf(" IGMP TYPE = 0x%02x\n", igmp_type);
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printf(" IGMP CODE = 0x%02x\n", igmp_code);
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printf(" IGMP GROUP = %s\n", igmp_group_str);
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printf(" GROUP TEST = %d\n", igmp_group_test);
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/*
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int test = 1;
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if ( *(char *) test == 1) {
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// little endian
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printf("little endian\n");
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} else {
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// big endian
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printf("big endian\n");
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}
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*/
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ptag = libnet_build_igmp(
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igmp_type, // IGMP type
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igmp_code, // IGMP code or TTL
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0, // checksum
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htonl(igmp_group), // ip addr
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NULL, // Ptr to packet data (or null)
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0, // Packet payload length
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netcontext, // Ptr to libnet context
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0); // Build a new packet header
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if (ptag < 0)
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{
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fprintf(stderr, "Error while building IGMP header data (err %d)\n", ptag);
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fprintf(stderr,"%s\n", libnet_geterror(netcontext));
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exit(1);
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}
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u_int8_t ipopt[2];
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ipopt[0] = IPOPT_RA;
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ipopt[1] = 4;
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ptag = libnet_build_ipv4_options(
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ipopt, // options
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2, // options_s (length of option string)
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netcontext, // libnet context
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0 // ptag
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);
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if (ptag < 0)
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{
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fprintf(stderr, "Error while building IPv4 options data (err %d)\n", ptag);
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}
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ptag = libnet_build_ipv4(LIBNET_IPV4_H + LIBNET_IGMP_H, // pkg size + data
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0, // IP tos
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getpid(), // IP ID
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IP_DF, // frag flags and offset
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1, // TTL
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IPPROTO_IGMP, // transport protocol
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0, // checksum
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ip_src, // source IP
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ip_dst, // destination IP
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NULL, // payload (none)
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0, // payload length
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netcontext, // libnet context
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0 // build a new header
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);
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if (ptag < 0)
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{
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fprintf(stderr, "Error while building IPv4 header data (err %d)\n", ptag);
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fprintf(stderr,"%s\n", libnet_geterror(netcontext));
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exit(1);
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}
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printf(" done\n"); //IGMP content
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c = libnet_write(netcontext);
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if (c < 0)
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{
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fprintf(stderr,"%s\n", libnet_geterror(netcontext));
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}
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else
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{
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printf("construction and injection completed, wrote all %d bytes\n", c);
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}
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/*
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* Free packet memory.
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*/
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libnet_diag_dump_pblock(netcontext);
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libnet_destroy(netcontext);
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return 0;
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exit(0);
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return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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// vim: ts=4 sts=4 sw=4 et
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