* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
#ifdef __linux__
#include "pim_igmp_mtrace.h"
#include "checksum.h"
+#include "prefix.h"
#include "mtracebis_routeget.h"
#include <sys/select.h>
#include <net/if.h>
#include <unistd.h>
#include <getopt.h>
+#include <netdb.h>
#define MTRACEBIS_VERSION "0.1"
#define MTRACE_TIMEOUT (5)
static const char *progname;
static void usage(void)
{
- fprintf(stderr, "Usage : %s <multicast source>\n", progname);
+ fprintf(stderr, "Usage : %s <multicast source> [<multicast group>]\n",
+ progname);
}
static void version(void)
{
fprintf(stderr, "%s %s\n", progname, MTRACEBIS_VERSION);
}
+static void print_host(struct in_addr addr)
+{
+ struct hostent *h;
+
+ h = gethostbyaddr(&addr, sizeof(addr), AF_INET);
+ if (h == NULL)
+ printf("?");
+ else
+ printf("%s", h->h_name);
+ printf(" (%s) ", inet_ntoa(addr));
+}
+
+static void print_line_no(int i)
+{
+ printf("%3d ", -i);
+}
+
+static const char *rtg_proto_str(enum mtrace_rtg_proto proto)
+{
+ static char buf[80];
+
+ buf[0] = '\0';
+
+ switch (proto) {
+ case MTRACE_RTG_PROTO_DVMRP:
+ return "DVMRP";
+ case MTRACE_RTG_PROTO_MOSPF:
+ return "MOSPF";
+ case MTRACE_RTG_PROTO_PIM:
+ return "PIM";
+ case MTRACE_RTG_PROTO_CBT:
+ return "CBT";
+ case MTRACE_RTG_PROTO_PIM_SPECIAL:
+ return "PIM special";
+ case MTRACE_RTG_PROTO_PIM_STATIC:
+ return "PIM static";
+ case MTRACE_RTG_PROTO_DVMRP_STATIC:
+ return "DVMRP static";
+ case MTRACE_RTG_PROTO_PIM_MBGP:
+ return "PIM MBGP";
+ case MTRACE_RTG_PROTO_CBT_SPECIAL:
+ return "CBT special";
+ case MTRACE_RTG_PROTO_CBT_STATIC:
+ return "CBT static";
+ case MTRACE_RTG_PROTO_PIM_ASSERT:
+ return "PIM assert";
+ default:
+ sprintf(buf, "unknown protocol (%d)", proto);
+ return buf;
+ }
+}
+
+static void print_rtg_proto(uint32_t rtg_proto)
+{
+ printf("%s", rtg_proto_str(rtg_proto));
+}
+
+static void print_fwd_ttl(uint32_t fwd_ttl)
+{
+ printf("thresh^ %d", fwd_ttl);
+}
+
+static const char *fwd_code_str(enum mtrace_fwd_code code)
+{
+ static char buf[80];
+
+ buf[0] = '\0';
+
+ switch (code) {
+ case MTRACE_FWD_CODE_NO_ERROR:
+ return "no error";
+ case MTRACE_FWD_CODE_WRONG_IF:
+ return "wrong interface";
+ case MTRACE_FWD_CODE_PRUNE_SENT:
+ return "prune sent";
+ case MTRACE_FWD_CODE_PRUNE_RCVD:
+ return "prune received";
+ case MTRACE_FWD_CODE_SCOPED:
+ return "scoped";
+ case MTRACE_FWD_CODE_NO_ROUTE:
+ return "no route";
+ case MTRACE_FWD_CODE_WRONG_LAST_HOP:
+ return "wrong last hop";
+ case MTRACE_FWD_CODE_NOT_FORWARDING:
+ return "not forwarding";
+ case MTRACE_FWD_CODE_REACHED_RP:
+ return "reached RP";
+ case MTRACE_FWD_CODE_RPF_IF:
+ return "RPF interface";
+ case MTRACE_FWD_CODE_NO_MULTICAST:
+ return "no multicast";
+ case MTRACE_FWD_CODE_INFO_HIDDEN:
+ return "info hidden";
+ case MTRACE_FWD_CODE_NO_SPACE:
+ return "no space";
+ case MTRACE_FWD_CODE_OLD_ROUTER:
+ return "old router";
+ case MTRACE_FWD_CODE_ADMIN_PROHIB:
+ return "admin. prohib.";
+ default:
+ sprintf(buf, "unknown fwd. code (%d)", code);
+ return buf;
+ }
+}
+
+static void print_fwd_code(uint32_t fwd_code)
+{
+ printf("%s", fwd_code_str(fwd_code));
+}
+
+static void print_rsp(struct igmp_mtrace_rsp *rsp)
+{
+ print_host(rsp->outgoing);
+ if (rsp->fwd_code == 0 || rsp->fwd_code == MTRACE_FWD_CODE_REACHED_RP) {
+ print_rtg_proto(rsp->rtg_proto);
+ printf(" ");
+ if (rsp->fwd_code == MTRACE_FWD_CODE_REACHED_RP)
+ printf("(RP) ");
+ if (rsp->rtg_proto == MTRACE_RTG_PROTO_PIM) {
+ switch (rsp->src_mask) {
+ case MTRACE_SRC_MASK_GROUP:
+ printf("(*,G) ");
+ break;
+ case MTRACE_SRC_MASK_SOURCE:
+ printf("(S,G) ");
+ break;
+ }
+ }
+ print_fwd_ttl(rsp->fwd_ttl);
+ } else {
+ print_fwd_code(rsp->fwd_code);
+ }
+ printf("\n");
+}
+
+static void print_dest(struct igmp_mtrace *mtrace)
+{
+ print_line_no(0);
+ print_host(mtrace->dst_addr);
+ printf("\n");
+}
+
+static void print_summary(struct igmp_mtrace *mtrace, int hops, long msec)
+{
+ int i;
+ int t = 0;
+
+ for (i = 0; i < hops; i++)
+ t += mtrace->rsp[i].fwd_ttl;
+
+ printf("Round trip time %ld ms; total ttl of %d required.\n", msec, t);
+}
+
+static void print_responses(struct igmp_mtrace *mtrace, int hops, long msec)
+{
+ int i;
+
+ print_dest(mtrace);
+
+ for (i = 0; i < hops; i++) {
+ print_line_no(i + 1);
+ print_rsp(&mtrace->rsp[i]);
+ }
+ print_summary(mtrace, hops, msec);
+}
+
static int send_query(int fd, struct in_addr to_addr,
struct igmp_mtrace *mtrace)
{
inet_ntop(AF_INET, &mtrace->grp_addr, grp_str, sizeof(grp_str)));
}
-static int recv_response(int fd, long msec, int *hops)
+static int recv_response(int fd, int *hops, struct igmp_mtrace *mtracer)
{
int recvd;
char mtrace_buf[IP_AND_MTRACE_BUF_LEN];
struct igmp_mtrace *mtrace;
int mtrace_len;
int responses;
- int i;
- u_short sum;
+ unsigned short sum;
+ size_t mtrace_off;
+ size_t ip_len;
recvd = recvfrom(fd, mtrace_buf, IP_AND_MTRACE_BUF_LEN, 0, NULL, 0);
if (sum != in_cksum(ip, ip->ip_hl * 4))
return -1;
- mtrace = (struct igmp_mtrace *)(mtrace_buf + (4 * ip->ip_hl));
-
- mtrace_len = ntohs(ip->ip_len) - ip->ip_hl * 4;
+ /* Header overflow check */
+ mtrace_off = 4 * ip->ip_hl;
+ if (mtrace_off > MTRACE_BUF_LEN)
+ return -1;
- if (mtrace_len < (int)MTRACE_HDR_SIZE)
+ /* Underflow/overflow check */
+ ip_len = ntohs(ip->ip_len);
+ if (ip_len < mtrace_off || ip_len < MTRACE_HDR_SIZE
+ || ip_len > MTRACE_BUF_LEN)
return -1;
+ mtrace_len = ip_len - mtrace_off;
+ mtrace = (struct igmp_mtrace *)(mtrace_buf + mtrace_off);
+
sum = mtrace->checksum;
mtrace->checksum = 0;
if (sum != in_cksum(mtrace, mtrace_len)) {
responses = mtrace_len - sizeof(struct igmp_mtrace);
responses /= sizeof(struct igmp_mtrace_rsp);
- printf("%ld ms received responses from %d hops.\n", msec, responses);
+ if (responses > MTRACE_MAX_HOPS) {
+ fprintf(stderr, "mtrace too large\n");
+ return -1;
+ }
if (hops)
*hops = responses;
- for (i = 0; i < responses; i++) {
- struct igmp_mtrace_rsp *rsp = &mtrace->rsp[i];
-
- if (rsp->fwd_code != 0)
- printf("-%d fwd. code 0x%2x.\n", i, rsp->fwd_code);
- }
+ if (mtracer)
+ memcpy(mtracer, mtrace, mtrace_len);
return 0;
}
-static int wait_for_response(int fd, int *hops)
+static int wait_for_response(int fd, int *hops, struct igmp_mtrace *mtrace,
+ long *ret_msec)
{
fd_set readfds;
struct timeval timeout;
- int ret = -1;
+ int ret;
long msec, rmsec, tmsec;
FD_ZERO(&readfds);
return ret;
rmsec = timeout.tv_sec * 1000 + timeout.tv_usec / 1000;
msec = tmsec - rmsec;
- } while (recv_response(fd, msec, hops) != 0);
+ } while (recv_response(fd, hops, mtrace) != 0);
+
+ if (ret_msec)
+ *ret_msec = msec;
return ret;
}
+static bool check_end(struct igmp_mtrace *mtrace, int hops)
+{
+ return mtrace->src_addr.s_addr == mtrace->rsp[hops - 1].prev_hop.s_addr;
+}
+
int main(int argc, char *const argv[])
{
struct in_addr mc_source;
+ struct in_addr mc_group;
struct in_addr iface_addr;
struct in_addr gw_addr;
struct in_addr mtrace_addr;
struct igmp_mtrace mtrace;
+ struct igmp_mtrace *mtracep;
int hops = 255;
int rhops;
int maxhops = 255;
int fd = -1;
int ret = -1;
int c;
+ long msec;
int i, j;
char ifname[IF_NAMESIZE];
- char ip_str[INET_ADDRSTRLEN];
+ char mbuf[MTRACE_BUF_LEN];
+ bool not_group;
mtrace_addr.s_addr = inet_addr("224.0.1.32");
else
progname = argv[0];
- if (argc != 2) {
+ if (argc != 2 && argc != 3) {
usage();
exit(EXIT_FAILURE);
}
}
if (inet_pton(AF_INET, argv[1], &mc_source) != 1) {
usage();
- fprintf(stderr, "%s: %s not a valid IPv4 address\n", argv[0],
+ fprintf(stderr, "%s: %s is not a valid IPv4 address\n", argv[0],
argv[1]);
exit(EXIT_FAILURE);
}
+ mc_group.s_addr = 0;
+ not_group = false;
+
+ if (argc == 3) {
+ if (inet_pton(AF_INET, argv[2], &mc_group) != 1)
+ not_group = true;
+ if (!not_group && !IPV4_CLASS_DE(ntohl(mc_group.s_addr)))
+ not_group = true;
+ }
+
+ if (not_group) {
+ usage();
+ fprintf(stderr, "%s: %s is not a valid IPv4 group address\n",
+ argv[0], argv[2]);
+ exit(EXIT_FAILURE);
+ }
+
ifindex = routeget(mc_source, &iface_addr, &gw_addr);
if (ifindex < 0) {
fprintf(stderr, "%s: failed to get route to source %s\n",
mtrace.type = PIM_IGMP_MTRACE_QUERY_REQUEST;
mtrace.hops = hops;
mtrace.checksum = 0;
- mtrace.grp_addr.s_addr = 0;
+ mtrace.grp_addr = mc_group;
mtrace.src_addr = mc_source;
mtrace.dst_addr = iface_addr;
mtrace.rsp_addr = unicast ? iface_addr : mtrace_addr;
goto close_fd;
}
printf("Querying full reverse path...\n");
- ret = wait_for_response(fd, NULL);
+ mtracep = (struct igmp_mtrace *)mbuf;
+ ret = wait_for_response(fd, &rhops, mtracep, &msec);
if (ret > 0) {
+ print_responses(mtracep, rhops, msec);
ret = 0;
goto close_fd;
}
}
printf(" * ");
printf("switching to hop-by-hop:\n");
- printf("%3d ? (%s)\n", 0,
- inet_ntop(AF_INET, &mtrace.dst_addr, ip_str, sizeof(ip_str)));
+ print_dest(&mtrace);
for (i = 1; i < maxhops; i++) {
- printf("%3d ", -i);
+ print_line_no(i);
mtrace.hops = i;
for (j = 0; j < perhop; j++) {
mtrace.qry_id++;
ret = EXIT_FAILURE;
goto close_fd;
}
- ret = wait_for_response(fd, &rhops);
+ ret = wait_for_response(fd, &rhops, mtracep, &msec);
if (ret > 0) {
+ if (check_end(mtracep, rhops)) {
+ print_rsp(&mtracep->rsp[rhops - 1]);
+ print_summary(mtracep, rhops, msec);
+ ret = 0;
+ goto close_fd;
+ }
if (i > rhops) {
+ printf(" * ...giving up.\n");
ret = 0;
goto close_fd;
}
+ print_rsp(&mtracep->rsp[rhops - 1]);
break;
}
printf(" *");
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