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igmpv3gen: Initial import.

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Glenn Y. Rolland 2009-09-25 21:18:43 +02:00
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IGMPPROG=igmpgen
CFLAGS=-Werror -Wall `libnet-config --defines`
LDFLAGS=`libnet-config --libs`
all:
gcc $(CFLAGS) $(IGMPPROG).c -o $(IGMPPROG) $(LDFLAGS)
clean:
rm -f $(IGMPPROG)

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src/igmpgen.c Normal file
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#include <libnet.h>
#include <netinet/igmp.h>
#define IGMP_V3_MEMBERSHIP_REPORT 0x22
struct igmp_extra {
u_int8_t igmp_version;
char * igmp_tag;
u_int8_t igmp_type; /* IGMP type */
u_int8_t igmp_code; /* routing code */
char * igmp_dst;
int group_override_dst;
} g_igmp_pkts[] = {
// name, type (or version+type), code
{ 1, "query", 0x11, 0, "224.0.0.1", 0 },
{ 1, "report", 0x12, 0, "224.0.0.1", 1 },
{ 1, "dvmrp", 0x13, 0, "224.0.0.1", 0 },
{ 2, "query", 0x11, 1, "224.0.0.1", 0 },
{ 2, "report", 0x16, 1, "224.0.0.2", 1 },
{ 2, "leave", 0x17, 1, "224.0.0.2", 0 },
{ 3, "report", 0x22, 1, "224.0.0.22", 0 },
{ 0, 0, 0, 0 },
};
void usage(char *);
int main(int argc, char **argv)
{
/* ip addresses */
u_int32_t ip_src = 0;
u_int32_t ip_dst = 0;
u_int32_t igmp_group = 0;
char *igmp_group_str = NULL;
char *ip_src_str = NULL;
char *ip_dst_str = NULL;
/* ports */
u_short src_prt = 3141;
u_short dst_prt = 5926;
u_char igmp_type = 0;
u_char igmp_code = 0;
u_int8_t igmp_version = 0;
int igmp_override;
struct igmp_extra *pkt_ptr;
int ip_src_test = 1;
int ip_dst_test = 1;
int igmp_group_test =1;
/* libnet stuff */
char neterr[LIBNET_ERRBUF_SIZE];
libnet_ptag_t ptag;
libnet_t * netcontext = NULL;
char *device = "eth0";
/* misc */
int c;
char *cp = NULL;
int found=0;
printf("IGMP packet generator\n\n");
printf("Parsing command line...\n");
while((c = getopt(argc, argv, "i:t:g:d:s:")) != EOF)
{
switch (c)
{
case 'i':
printf(" Net interface = [%s]\n",optarg);
device = optarg;
break;
case 't':
if (!(cp = strrchr(optarg, '.'))) {
usage(argv[0]);
exit(1);
}
*cp++ = 0;
igmp_version = (u_short)atoi(cp);
pkt_ptr = g_igmp_pkts;
while(pkt_ptr->igmp_version || pkt_ptr->igmp_tag){
if ((strcasecmp(pkt_ptr->igmp_tag, optarg) == 0)
&& (igmp_version == pkt_ptr->igmp_version)){
found = 1;
igmp_type = pkt_ptr->igmp_type;
igmp_code = pkt_ptr->igmp_code;
ip_dst_str = pkt_ptr->igmp_dst;
igmp_override = pkt_ptr->group_override_dst;
break;
}
pkt_ptr++;
}
if (found){
printf(" Packet = [%s] version [%d]\n", pkt_ptr->igmp_tag, igmp_version);
} else {
usage(argv[0]);
exit(1);
}
break;
case 'g':
printf(" Group = [%s]\n", optarg);
igmp_group_str = optarg;
break;
case 'n':
// delay between packets in sec
break;
/*
* We expect the input to be of the form `ip.ip.ip.ip.port`. We
* point cp to the last dot of the IP address/port string and
* then seperate them with a NULL byte. The optarg now points to
* just the IP address, and cp points to the port.
*/
case 'd':
if ((cp = strrchr(optarg, ':')))
{
*cp++ = 0;
dst_prt = (u_short)atoi(cp);
} else {
dst_prt = 0;
}
ip_dst_str = strdup(optarg);
printf(" Destination = ip [%s] port [%d]\n", ip_dst_str, dst_prt);
break;
case 's':
if ((cp = strrchr(optarg, ':')))
{
*cp++ = 0;
src_prt = (u_short)atoi(cp);
} else {
src_prt = 0;
}
ip_src_str = strdup(optarg);
printf(" Source = ip [%s] port [%d]\n", ip_src_str, src_prt);
break;
}
}
if (!igmp_group_str || !device)
{
usage(argv[0]);
exit(EXIT_FAILURE);
}
printf("done\n");
/*
* Memory initialization
*/
printf("Initializing libnet context...");
netcontext = libnet_init(LIBNET_RAW4, device, neterr);
if (!netcontext){
fprintf(stderr,neterr);
exit(1);
}
libnet_clear_packet(netcontext);
if (!ip_src_str)
{
ip_src = libnet_get_ipaddr4(netcontext);
ip_src_str = libnet_addr2name4(ip_src, LIBNET_DONT_RESOLVE);
}
printf("done\n");
printf("Packet construction...\n");
/*
* Packet construction : IGMP
*/
printf(" Building IGMP content...\n");
// Override dest with group info when needed
if (igmp_override) {
ip_dst_str = igmp_group_str;
}
switch ( igmp_type ) {
case 0x11: // IGMP_MEMBERSHIP_QUERY
if (igmp_version == 2){
// group specific
} else if (igmp_version == 1) {
// general
igmp_group = 0;
igmp_group_str = "0.0.0.0";
igmp_group_test = 0;
}
// DST = 224.0.0.1
//igmp_group = 0;
//igmp_group_test = 0;
break;
case 0x12: //
default:
break;
}
if (ip_src_test
&& !(ip_src = libnet_name2addr4(netcontext, ip_src_str, LIBNET_RESOLVE)))
{
fprintf(stderr,"Bad source IP address: %s\n", ip_src_str);
fprintf(stderr,"%s\n", libnet_geterror(netcontext));
exit(1);
}
if (ip_dst_test
&& !(ip_dst = libnet_name2addr4(netcontext, ip_dst_str, LIBNET_RESOLVE)))
{
fprintf(stderr,"Bad destination IP address: %s\n", ip_dst_str);
fprintf(stderr,"%s\n", libnet_geterror(netcontext));
exit(1);
}
if (igmp_group_test && !(igmp_group = libnet_name2addr4(netcontext, igmp_group_str, LIBNET_RESOLVE)))
{
fprintf(stderr,"Bad group IP address: %s\n", optarg);
fprintf(stderr,"%s\n", libnet_geterror(netcontext));
exit(1);
}
printf(" IP SRC IP = %s\n", ip_src_str);
printf(" IP DEST IP = %s\n", ip_dst_str);
printf(" IGMP TYPE = 0x%02x\n", igmp_type);
printf(" IGMP CODE = 0x%02x\n", igmp_code);
printf(" IGMP GROUP = %s\n", igmp_group_str);
printf(" GROUP TEST = %d\n", igmp_group_test);
/*
int test = 1;
if ( *(char *) test == 1) {
// little endian
printf("little endian\n");
} else {
// big endian
printf("big endian\n");
}
*/
ptag = libnet_build_igmp(
igmp_type, // IGMP type
igmp_code, // IGMP code or TTL
0, // checksum
htonl(igmp_group), // ip addr
NULL, // Ptr to packet data (or null)
0, // Packet payload length
netcontext, // Ptr to libnet context
0); // Build a new packet header
if (ptag < 0)
{
fprintf(stderr, "Error while building IGMP header data (err %d)\n", ptag);
fprintf(stderr,"%s\n", libnet_geterror(netcontext));
exit(1);
}
u_int8_t ipopt[2];
ipopt[0] = IPOPT_RA;
ipopt[1] = 4;
ptag = libnet_build_ipv4_options(
ipopt, // options
2, // options_s (length of option string)
netcontext, // libnet context
0 // ptag
);
if (ptag < 0)
{
fprintf(stderr, "Error while building IPv4 options data (err %d)\n", ptag);
}
ptag = libnet_build_ipv4(LIBNET_IPV4_H + LIBNET_IGMP_H, // pkg size + data
0, // IP tos
getpid(), // IP ID
IP_DF, // frag flags and offset
1, // TTL
IPPROTO_IGMP, // transport protocol
0, // checksum
ip_src, // source IP
ip_dst, // destination IP
NULL, // payload (none)
0, // payload length
netcontext, // libnet context
0 // build a new header
);
if (ptag < 0)
{
fprintf(stderr, "Error while building IPv4 header data (err %d)\n", ptag);
fprintf(stderr,"%s\n", libnet_geterror(netcontext));
exit(1);
}
printf(" done\n"); //IGMP content
c = libnet_write(netcontext);
if (c < 0)
{
fprintf(stderr,"%s\n", libnet_geterror(netcontext));
}
else
{
printf("construction and injection completed, wrote all %d bytes\n", c);
}
/*
* Free packet memory.
*/
libnet_diag_dump_pblock(netcontext);
libnet_destroy(netcontext);
exit(0);
return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
}
void usage(char *name)
{
struct igmp_extra *pkt_ptr;
fprintf(stderr, "usage: %s -i ethdevice -g group -t packet.version [-s ip:port] [-d ip:port]\n", name);
pkt_ptr = g_igmp_pkts;
fprintf(stderr,"\nAvailable packet types:\n");
while(pkt_ptr->igmp_version || pkt_ptr->igmp_tag){
fprintf(stderr," - %s.%d\n", pkt_ptr->igmp_tag, pkt_ptr->igmp_version);
pkt_ptr++;
}
}
// vim: ts=4 sts=4 sw=4 et