/* $NetBSD: mtrace.c,v 1.43 2021/10/21 13:21:55 andvar Exp $ */
/*
* mtrace.c
*
* This tool traces the branch of a multicast tree from a source to a
* receiver for a particular multicast group and gives statistics
* about packet rate and loss for each hop along the path. It can
* usually be invoked just as
*
* mtrace source
*
* to trace the route from that source to the local host for a default
* group when only the route is desired and not group-specific packet
* counts. See the usage line for more complex forms.
*
*
* Released 4 Apr 1995. This program was adapted by Steve Casner
* (USC/ISI) from a prototype written by Ajit Thyagarajan (UDel and
* Xerox PARC). It attempts to parallel in command syntax and output
* format the unicast traceroute program written by Van Jacobson (LBL)
* for the parts where that makes sense.
*
* Copyright (c) 1998-2001.
* The University of Southern California/Information Sciences Institute.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: mtrace.c,v 1.43 2021/10/21 13:21:55 andvar Exp $");
#endif
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <memory.h>
#include <netdb.h>
#include <string.h>
#include <ifaddrs.h>
#include "defs.h"
#include <stdarg.h>
#ifdef SUNOS5
#include <sys/systeminfo.h>
#endif
#define DEFAULT_TIMEOUT 3 /* How long to wait before retrying requests */
#define DEFAULT_RETRIES 3 /* How many times to try */
#define MAXHOPS UNREACHABLE /* Don't need more hops than max metric */
#define UNICAST_TTL 255 /* TTL for unicast response */
#define MULTICAST_TTL1 64 /* Default TTL for multicast query/response */
#define MULTICAST_TTL_INC 32 /* TTL increment for increase after timeout */
#define MULTICAST_TTL_MAX 192 /* Maximum TTL allowed (protect low-BW links */
struct resp_buf {
u_long qtime; /* Time query was issued */
u_long rtime; /* Time response was received */
int len; /* Number of reports or length of data */
struct igmp igmp; /* IGMP header */
union {
struct {
struct tr_query q; /* Query/response header */
struct tr_resp r[MAXHOPS]; /* Per-hop reports */
} t;
char d[MAX_DVMRP_DATA_LEN]; /* Neighbor data */
} u;
} base, incr[2];
#define qhdr u.t.q
#define resps u.t.r
#define ndata u.d
char names[MAXHOPS][40];
int reset[MAXHOPS]; /* To get around 3.4 bug, ... */
int swaps[MAXHOPS]; /* To get around 3.6 bug, ... */
int timeout = DEFAULT_TIMEOUT;
int nqueries = DEFAULT_RETRIES;
int numeric = FALSE;
int debug = 0;
int passive = FALSE;
int multicast = FALSE;
int statint = 10;
int verbose = 0;
u_int32_t defgrp; /* Default group if not specified */
u_int32_t query_cast; /* All routers multicast addr */
u_int32_t resp_cast; /* Mtrace response multicast addr */
u_int32_t lcl_addr = 0; /* This host address, in NET order */
u_int32_t dst_netmask; /* netmask to go with qdst */
/*
* Query/response parameters, all initialized to zero and set later
* to default values or from options.
*/
u_int32_t qsrc = 0; /* Source address in the query */
u_int32_t qgrp = 0; /* Group address in the query */
u_int32_t qdst = 0; /* Destination (receiver) address in query */
u_char qno = 0; /* Max number of hops to query */
u_int32_t raddr = 0; /* Address where response should be sent */
int qttl = 0; /* TTL for the query packet */
u_char rttl = 0; /* TTL for the response packet */
u_int32_t gwy = 0; /* User-supplied last-hop router address */
u_int32_t tdst = 0; /* Address where trace is sent (last-hop) */
vifi_t numvifs; /* to keep loader happy */
/* (see kern.c) */
u_long byteswap(u_long);
const char * inet_name(u_int32_t addr);
u_int32_t host_addr(const char *name);
/* u_int is promoted u_char */
const char * proto_type(u_int type);
const char * flag_type(u_int type);
u_int32_t get_netmask(int s, u_int32_t dst);
int get_ttl(struct resp_buf *buf);
int t_diff(u_long a, u_long b);
u_long fixtime(u_long time);
int send_recv(u_int32_t dst, int type, int code,
int tries, struct resp_buf *save);
const char * print_host(u_int32_t addr);
const char * print_host2(u_int32_t addr1, u_int32_t addr2);
void print_trace(int index, struct resp_buf *buf);
int what_kind(struct resp_buf *buf, const char *why);
const char * scale(int *hop);
void stat_line(struct tr_resp *r, struct tr_resp *s,
int have_next, int *res);
void fixup_stats(struct resp_buf *base,
struct resp_buf *prev,
struct resp_buf *new);
int print_stats(struct resp_buf *base,
struct resp_buf *prev,
struct resp_buf *new);
void check_vif_state(void);
void passive_mode(void) __dead;
int main(int argc, char *argv[]);
/* logit() prototyped in defs.h */
const char *
inet_name(u_int32_t addr)
{
struct hostent *e;
e = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET);
return e ? e->h_name : "?";
}
u_int32_t
host_addr(const char *name)
{
struct hostent *e = (struct hostent *)0;
u_int32_t addr;
int i, dots = 3;
char buf[40];
const char *ip = name;
char *op = buf;
/*
* Undo BSD's favor -- take fewer than 4 octets as net/subnet address
* if the name is all numeric.
*/
for (i = sizeof(buf) - 7; i > 0; --i) {
if (*ip == '.') --dots;
else if (*ip == '\0') break;
else if (!isdigit((unsigned char)*ip)) dots = 0; /* Not numeric, don't add zeroes */
*op++ = *ip++;
}
for (i = 0; i < dots; ++i) {
*op++ = '.';
*op++ = '0';
}
*op = '\0';
if (dots <= 0) e = gethostbyname(name);
if (e) memcpy((char *)&addr, e->h_addr_list[0], sizeof(addr));
else {
addr = inet_addr(buf);
if (addr == (in_addr_t)-1) {
addr = 0;
printf("Could not parse %s as host name or address\n", name);
}
}
return addr;
}
const char *
proto_type(u_int type)
{
static char buf[80];
switch (type) {
case PROTO_DVMRP:
return ("DVMRP");
case PROTO_MOSPF:
return ("MOSPF");
case PROTO_PIM:
return ("PIM");
case PROTO_CBT:
return ("CBT");
case PROTO_PIM_SPEC:
return ("PIM-special");
case PROTO_PIM_STAT:
return ("PIM-static");
case PROTO_DVMRP_STAT:
return ("DVMRP-static");
case PROTO_PIM_MBGP:
return ("PIM/MBGP");
default:
(void)snprintf(buf, sizeof buf, "Unknown protocol code %d", type);
return (buf);
}
}
const char *
flag_type(u_int type)
{
static char buf[80];
switch (type) {
case TR_NO_ERR:
return ("");
case TR_WRONG_IF:
return ("Wrong interface");
case TR_PRUNED:
return ("Prune sent upstream");
case TR_OPRUNED:
return ("Output pruned");
case TR_SCOPED:
return ("Hit scope boundary");
case TR_NO_RTE:
return ("No route");
case TR_OLD_ROUTER:
return ("Next router no mtrace");
case TR_NO_FWD:
return ("Not forwarding");
case TR_NO_SPACE:
return ("No space in packet");
case TR_RP_OR_CORE:
return ("RP/Core");
case TR_RPF_INT:
return ("Trace packet on RPT interface");
case TR_NO_MULTICAST:
return ("Trace packet on non-MC interface");
case TR_ADMIN_DENY:
return ("Trace admin-denied");
default:
(void)snprintf(buf, sizeof buf, "Unknown error code %d", type);
return (buf);
}
}
/*
* If destination is on a local net, get the netmask, else set the
* netmask to all ones. There are two side effects: if the local
* address was not explicitly set, and if the destination is on a
* local net, use that one; in either case, verify that the local
* address is valid.
*/
u_int32_t
get_netmask(int s, u_int32_t dst)
{
u_int32_t if_addr, if_mask;
u_int32_t retval = 0xFFFFFFFF;
int found = FALSE;
struct ifaddrs *ifap, *ifa;
if (getifaddrs(&ifap) != 0) {
perror("getifaddrs");
return (retval);
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
if_addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
if_mask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr.s_addr;
if ((dst & if_mask) == (if_addr & if_mask)) {
retval = if_mask;
if (lcl_addr == 0)
lcl_addr = if_addr;
}
if (lcl_addr == if_addr)
found = TRUE;
}
if (!found && lcl_addr != 0) {
printf("Interface address is not valid\n");
exit(1);
}
freeifaddrs(ifap);
return (retval);
}
int
get_ttl(struct resp_buf *buf)
{
int rno;
struct tr_resp *b;
u_int ttl;
if (buf && (rno = buf->len) > 0) {
b = buf->resps + rno - 1;
ttl = b->tr_fttl;
while (--rno > 0) {
--b;
if (ttl < b->tr_fttl) ttl = b->tr_fttl;
else ++ttl;
}
ttl += MULTICAST_TTL_INC;
if (ttl < MULTICAST_TTL1) ttl = MULTICAST_TTL1;
if (ttl > MULTICAST_TTL_MAX) ttl = MULTICAST_TTL_MAX;
return (ttl);
} else return(MULTICAST_TTL1);
}
/*
* Calculate the difference between two 32-bit NTP timestamps and return
* the result in milliseconds.
*/
int
t_diff(u_long a, u_long b)
{
int d = a - b;
return ((d * 125) >> 13);
}
/*
* Fixup for incorrect time format in 3.3 mrouted.
* This is possible because (JAN_1970 mod 64K) is quite close to 32K,
* so correct and incorrect times will be far apart.
*/
u_long
fixtime(u_long tim)
{
if (abs((int)(tim-base.qtime)) > 0x3FFFFFFF)
tim = ((tim & 0xFFFF0000) + (JAN_1970 << 16)) +
((tim & 0xFFFF) << 14) / 15625;
return (tim);
}
/*
* Swap bytes for poor little-endian machines that don't byte-swap
*/
u_long
byteswap(u_long v)
{
return ((v << 24) | ((v & 0xff00) << 8) |
((v >> 8) & 0xff00) | (v >> 24));
}
int
send_recv(u_int32_t dst, int type, int code, int tries, struct resp_buf *save)
{
struct pollfd set[1];
struct timeval tq, tr, tv;
struct ip *ip;
struct igmp *igmp;
struct tr_query *query, *rquery;
int ipdatalen, iphdrlen, igmpdatalen;
u_int32_t local, group;
int datalen;
int count, recvlen;
socklen_t dummy;
int len;
int i;
if (type == IGMP_MTRACE_QUERY) {
group = qgrp;
datalen = sizeof(struct tr_query);
} else {
group = htonl(MROUTED_LEVEL);
datalen = 0;
}
if (IN_MULTICAST(ntohl(dst))) local = lcl_addr;
else local = INADDR_ANY;
/*
* If the reply address was not explicitly specified, start off
* with the unicast address of this host. Then, if there is no
* response after trying half the tries with unicast, switch to
* the standard multicast reply address. If the TTL was also not
* specified, set a multicast TTL and if needed increase it for the
* last quarter of the tries.
*/
query = (struct tr_query *)(send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN);
query->tr_raddr = raddr ? raddr : multicast ? resp_cast : lcl_addr;
query->tr_rttl = rttl ? rttl :
IN_MULTICAST(ntohl(query->tr_raddr)) ? get_ttl(save) : UNICAST_TTL;
query->tr_src = qsrc;
query->tr_dst = qdst;
for (i = tries ; i > 0; --i) {
if (tries == nqueries && raddr == 0) {
if (i == ((nqueries + 1) >> 1)) {
query->tr_raddr = resp_cast;
if (rttl == 0) query->tr_rttl = get_ttl(save);
}
if (i <= ((nqueries + 3) >> 2) && rttl == 0) {
query->tr_rttl += MULTICAST_TTL_INC;
if (query->tr_rttl > MULTICAST_TTL_MAX)
query->tr_rttl = MULTICAST_TTL_MAX;
}
}
/*
* Change the qid for each request sent to avoid being confused
* by duplicate responses
*/
query->tr_qid = arc4random() >> 8;
/*
* Set timer to calculate delays, then send query
*/
gettimeofday(&tq, 0);
send_igmp(local, dst, type, code, group, datalen);
/*
* Wait for response, discarding false alarms
*/
set[0].fd = igmp_socket;
set[0].events = POLLIN;
while (TRUE) {
gettimeofday(&tv, 0);
tv.tv_sec = tq.tv_sec + timeout - tv.tv_sec;
tv.tv_usec = tq.tv_usec - tv.tv_usec;
if (tv.tv_usec < 0) tv.tv_usec += 1000000L, --tv.tv_sec;
if (tv.tv_sec < 0) tv.tv_sec = tv.tv_usec = 0;
count = poll(set, 1, tv.tv_sec * 1000 + tv.tv_usec / 1000);
if (count < 0) {
if (errno != EINTR) perror("select");
continue;
} else if (count == 0) {
printf("* ");
fflush(stdout);
break;
}
gettimeofday(&tr, 0);
recvlen = recvfrom(igmp_socket, recv_buf, RECV_BUF_SIZE,
0, (struct sockaddr *)0, &dummy);
if (recvlen <= 0) {
if (recvlen && errno != EINTR) perror("recvfrom");
continue;
}
if (recvlen < (int)sizeof(struct ip)) {
fprintf(stderr,
"packet too short (%u bytes) for IP header", recvlen);
continue;
}
ip = (struct ip *) recv_buf;
if (ip->ip_p == 0) /* ignore cache creation requests */
continue;
iphdrlen = ip->ip_hl << 2;
ipdatalen = ip->ip_len;
if (iphdrlen + ipdatalen != recvlen) {
fprintf(stderr,
"packet shorter (%u bytes) than hdr+data len (%u+%u)\n",
recvlen, iphdrlen, ipdatalen);
continue;
}
igmp = (struct igmp *) (recv_buf + iphdrlen);
igmpdatalen = ipdatalen - IGMP_MINLEN;
if (igmpdatalen < 0) {
fprintf(stderr,
"IP data field too short (%u bytes) for IGMP from %s\n",
ipdatalen, inet_fmt(ip->ip_src.s_addr));
continue;
}
switch (igmp->igmp_type) {
case IGMP_DVMRP:
if (igmp->igmp_code != DVMRP_NEIGHBORS2) continue;
len = igmpdatalen;
/*
* Accept DVMRP_NEIGHBORS2 response if it comes from the
* address queried or if that address is one of the local
* addresses in the response.
*/
if (ip->ip_src.s_addr != dst) {
u_int32_t *p = (u_int32_t *)(igmp + 1);
u_int32_t *ep = p + (len >> 2);
while (p < ep) {
u_int32_t laddr = *p++;
int n = ntohl(*p++) & 0xFF;
if (laddr == dst) {
ep = p + 1; /* ensure p < ep after loop */
break;
}
p += n;
}
if (p >= ep) continue;
}
break;
case IGMP_MTRACE_QUERY: /* For backward compatibility with 3.3 */
case IGMP_MTRACE_REPLY:
if (igmpdatalen <= (int)QLEN) continue;
if ((igmpdatalen - QLEN)%RLEN) {
printf("packet with incorrect datalen\n");
continue;
}
/*
* Ignore responses that don't match query.
*/
rquery = (struct tr_query *)(igmp + 1);
if (rquery->tr_qid != query->tr_qid) continue;
if (rquery->tr_src != qsrc) continue;
if (rquery->tr_dst != qdst) continue;
len = (igmpdatalen - QLEN)/RLEN;
/*
* Ignore trace queries passing through this node when
* mtrace is run on an mrouter that is in the path
* (needed only because IGMP_MTRACE_QUERY is accepted above
* for backward compatibility with multicast release 3.3).
*/
if (igmp->igmp_type == IGMP_MTRACE_QUERY) {
struct tr_resp *r = (struct tr_resp *)(rquery+1) + len - 1;
u_int32_t smask;
VAL_TO_MASK(smask, r->tr_smask);
if (len < code && (r->tr_inaddr & smask) != (qsrc & smask)
&& r->tr_rmtaddr != 0 && !(r->tr_rflags & 0x80))
continue;
}
/*
* A match, we'll keep this one.
*/
if (len > code) {
fprintf(stderr,
"Num hops received (%d) exceeds request (%d)\n",
len, code);
}
rquery->tr_raddr = query->tr_raddr; /* Insure these are */
rquery->tr_rttl = query->tr_rttl; /* as we sent them */
break;
default:
continue;
}
/*
* Most of the sanity checking done at this point.
* Return this packet we have been waiting for.
*/
if (save) {
save->qtime = ((tq.tv_sec + JAN_1970) << 16) +
(tq.tv_usec << 10) / 15625;
save->rtime = ((tr.tv_sec + JAN_1970) << 16) +
(tr.tv_usec << 10) / 15625;
save->len = len;
bcopy((char *)igmp, (char *)&save->igmp, ipdatalen);
}
return (recvlen);
}
}
return (0);
}
/*
* Most of this code is duplicated elsewhere. I'm not sure if
* the duplication is absolutely required or not.
*
* Ideally, this would keep track of ongoing statistics
* collection and print out statistics. (& keep track
* of h-b-h traces and only print the longest) For now,
* it just snoops on what traces it can.
*/
void
passive_mode(void)
{
struct timeval tr;
struct ip *ip;
struct igmp *igmp;
struct tr_resp *r;
int ipdatalen, iphdrlen, igmpdatalen;
int len, recvlen;
socklen_t dummy;
u_int32_t smask;
if (raddr) {
if (IN_MULTICAST(ntohl(raddr))) k_join(raddr, INADDR_ANY);
} else k_join(htonl(0xE0000120), INADDR_ANY);
while (1) {
recvlen = recvfrom(igmp_socket, recv_buf, RECV_BUF_SIZE,
0, (struct sockaddr *)0, &dummy);
gettimeofday(&tr,0);
if (recvlen <= 0) {
if (recvlen && errno != EINTR) perror("recvfrom");
continue;
}
if (recvlen < (int)sizeof(struct ip)) {
fprintf(stderr,
"packet too short (%u bytes) for IP header", recvlen);
continue;
}
ip = (struct ip *) recv_buf;
if (ip->ip_p == 0) /* ignore cache creation requests */
continue;
iphdrlen = ip->ip_hl << 2;
ipdatalen = ip->ip_len;
if (iphdrlen + ipdatalen != recvlen) {
fprintf(stderr,
"packet shorter (%u bytes) than hdr+data len (%u+%u)\n",
recvlen, iphdrlen, ipdatalen);
continue;
}
igmp = (struct igmp *) (recv_buf + iphdrlen);
igmpdatalen = ipdatalen - IGMP_MINLEN;
if (igmpdatalen < 0) {
fprintf(stderr,
"IP data field too short (%u bytes) for IGMP from %s\n",
ipdatalen, inet_fmt(ip->ip_src.s_addr));
continue;
}
switch (igmp->igmp_type) {
case IGMP_MTRACE_QUERY: /* For backward compatibility with 3.3 */
case IGMP_MTRACE_REPLY:
if (igmpdatalen < (int)QLEN) continue;
if ((igmpdatalen - QLEN)%RLEN) {
printf("packet with incorrect datalen\n");
continue;
}
len = (igmpdatalen - QLEN)/RLEN;
break;
default:
continue;
}
base.qtime = ((tr.tv_sec + JAN_1970) << 16) +
(tr.tv_usec << 10) / 15625;
base.rtime = ((tr.tv_sec + JAN_1970) << 16) +
(tr.tv_usec << 10) / 15625;
base.len = len;
bcopy((char *)igmp, (char *)&base.igmp, ipdatalen);
/*
* If the user specified which traces to monitor,
* only accept traces that correspond to the
* request
*/
if ((qsrc != 0 && qsrc != base.qhdr.tr_src) ||
(qdst != 0 && qdst != base.qhdr.tr_dst) ||
(qgrp != 0 && qgrp != igmp->igmp_group.s_addr))
continue;
printf("Mtrace from %s to %s via group %s (mxhop=%d)\n",
inet_fmt(base.qhdr.tr_dst),
inet_fmt(base.qhdr.tr_src),
inet_fmt(igmp->igmp_group.s_addr),
igmp->igmp_code);
if (len == 0)
continue;
printf(" 0 ");
print_host(base.qhdr.tr_dst);
printf("\n");
print_trace(1, &base);
r = base.resps + base.len - 1;
VAL_TO_MASK(smask, r->tr_smask);
if ((r->tr_inaddr & smask) == (base.qhdr.tr_src & smask)) {
printf("%3d ", -(base.len+1));
print_host(base.qhdr.tr_src);
printf("\n");
} else if (r->tr_rmtaddr != 0) {
printf("%3d ", -(base.len+1));
what_kind(&base, r->tr_rflags == TR_OLD_ROUTER ?
"doesn't support mtrace"
: "is the next hop");
}
printf("\n");
}
}
const char *
print_host(u_int32_t addr)
{
return print_host2(addr, 0);
}
/*
* On some routers, one interface has a name and the other doesn't.
* We always print the address of the outgoing interface, but can
* sometimes get the name from the incoming interface. This might be
* confusing but should be slightly more helpful than just a "?".
*/
const char *
print_host2(u_int32_t addr1, u_int32_t addr2)
{
const char *name;
if (numeric) {
printf("%s", inet_fmt(addr1));
return ("");
}
name = inet_name(addr1);
if (*name == '?' && *(name + 1) == '\0' && addr2 != 0)
name = inet_name(addr2);
printf("%s (%s)", name, inet_fmt(addr1));
return (name);
}
/*
* Print responses as received (reverse path from dst to src)
*/
void
print_trace(int idx, struct resp_buf *buf)
{
struct tr_resp *r;
const char *name;
int i;
int hop;
const char *ms, *ft;
i = abs(idx);
r = buf->resps + i - 1;
for (; i <= buf->len; ++i, ++r) {
if (idx > 0) printf("%3d ", -i);
name = print_host2(r->tr_outaddr, r->tr_inaddr);
printf(" %s thresh^ %d", proto_type(r->tr_rproto), r->tr_fttl);
if (verbose) {
hop = t_diff(fixtime(ntohl(r->tr_qarr)), buf->qtime);
ms = scale(&hop);
printf(" %d%s", hop, ms);
}
ft = flag_type(r->tr_rflags);
if (strlen(ft) != 0)
printf(" %s", ft);
printf("\n");
memcpy(names[i-1], name, sizeof(names[0]) - 1);
names[i-1][sizeof(names[0])-1] = '\0';
}
}
/*
* See what kind of router is the next hop
*/
int
what_kind(struct resp_buf *buf, const char *why)
{
u_int32_t smask;
int retval;
int hops = buf->len;
struct tr_resp *r = buf->resps + hops - 1;
u_int32_t next = r->tr_rmtaddr;
retval = send_recv(next, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS2, 1, &incr[0]);
print_host(next);
if (retval) {
u_int32_t version = ntohl(incr[0].igmp.igmp_group.s_addr);
u_int32_t *p = (u_int32_t *)incr[0].ndata;
u_int32_t *ep = p + (incr[0].len >> 2);
const char *type = "";
retval = 0;
switch (version & 0xFF) {
case 1:
type = "proteon/mrouted ";
retval = 1;
break;
case 2:
case 3:
if (((version >> 8) & 0xFF) < 3) retval = 1;
/* Fall through */
case 4:
type = "mrouted ";
break;
case 10:
type = "cisco ";
}
printf(" [%s%d.%d] %s\n",
type, version & 0xFF, (version >> 8) & 0xFF,
why);
VAL_TO_MASK(smask, r->tr_smask);
while (p < ep) {
u_int32_t laddr = *p++;
int flags = (ntohl(*p) & 0xFF00) >> 8;
int n = ntohl(*p++) & 0xFF;
if (!(flags & (DVMRP_NF_DOWN | DVMRP_NF_DISABLED)) &&
(laddr & smask) == (qsrc & smask)) {
printf("%3d ", -(hops+2));
print_host(qsrc);
printf("\n");
return 1;
}
p += n;
}
return retval;
}
printf(" %s\n", why);
return 0;
}
const char *
scale(int *hop)
{
if (*hop > -1000 && *hop < 10000) return (" ms");
*hop /= 1000;
if (*hop > -1000 && *hop < 10000) return (" s ");
return ("s ");
}
/*
* Calculate and print one line of packet loss and packet rate statistics.
* Checks for count of all ones from mrouted 2.3 that doesn't have counters.
*/
#define NEITHER 0
#define INS 1
#define OUTS 2
#define BOTH 3
void
stat_line(struct tr_resp *r, struct tr_resp *s, int have_next, int *rst)
{
int timediff = (fixtime(ntohl(s->tr_qarr)) -
fixtime(ntohl(r->tr_qarr))) >> 16;
int v_lost, v_pct;
int g_lost, g_pct;
int v_out = ntohl(s->tr_vifout) - ntohl(r->tr_vifout);
int g_out = ntohl(s->tr_pktcnt) - ntohl(r->tr_pktcnt);
int v_pps, g_pps;
char v_str[8], g_str[8];
int have = NEITHER;
int res = *rst;
if (timediff == 0) timediff = 1;
v_pps = v_out / timediff;
g_pps = g_out / timediff;
if ((v_out && (s->tr_vifout != 0xFFFFFFFF && s->tr_vifout != 0)) ||
(r->tr_vifout != 0xFFFFFFFF && r->tr_vifout != 0))
have |= OUTS;
if (have_next) {
--r, --s, --rst;
if ((s->tr_vifin != 0xFFFFFFFF && s->tr_vifin != 0) ||
(r->tr_vifin != 0xFFFFFFFF && r->tr_vifin != 0))
have |= INS;
if (*rst)
res = 1;
}
switch (have) {
case BOTH:
v_lost = v_out - (ntohl(s->tr_vifin) - ntohl(r->tr_vifin));
if (v_out) v_pct = (v_lost * 100 + (v_out >> 1)) / v_out;
else v_pct = 0;
if (-100 < v_pct && v_pct < 101 && v_out > 10)
(void)snprintf(v_str, sizeof v_str, "%3d", v_pct);
else memcpy(v_str, " --", 4);
g_lost = g_out - (ntohl(s->tr_pktcnt) - ntohl(r->tr_pktcnt));
if (g_out) g_pct = (g_lost * 100 + (g_out >> 1))/ g_out;
else g_pct = 0;
if (-100 < g_pct && g_pct < 101 && g_out > 10)
(void)snprintf(g_str, sizeof g_str, "%3d", g_pct);
else memcpy(g_str, " --", 4);
printf("%6d/%-5d=%s%%%4d pps",
v_lost, v_out, v_str, v_pps);
if (res)
printf("\n");
else
printf("%6d/%-5d=%s%%%4d pps\n",
g_lost, g_out, g_str, g_pps);
break;
case INS:
v_out = ntohl(s->tr_vifin) - ntohl(r->tr_vifin);
v_pps = v_out / timediff;
/* Fall through */
case OUTS:
printf(" %-5d %4d pps",
v_out, v_pps);
if (res)
printf("\n");
else
printf(" %-5d %4d pps\n",
g_out, g_pps);
break;
case NEITHER:
printf("\n");
break;
}
if (debug > 2) {
printf("\t\t\t\tv_in: %ld ", (long)ntohl(s->tr_vifin));
printf("v_out: %ld ", (long)ntohl(s->tr_vifout));
printf("pkts: %ld\n", (long)ntohl(s->tr_pktcnt));
printf("\t\t\t\tv_in: %ld ", (long)ntohl(r->tr_vifin));
printf("v_out: %ld ", (long)ntohl(r->tr_vifout));
printf("pkts: %ld\n", (long)ntohl(r->tr_pktcnt));
printf("\t\t\t\tv_in: %ld ",
(long)ntohl(s->tr_vifin)-ntohl(r->tr_vifin));
printf("v_out: %ld ",
(long)(ntohl(s->tr_vifout) - ntohl(r->tr_vifout)));
printf("pkts: %ld ", (long)(ntohl(s->tr_pktcnt) - ntohl(r->tr_pktcnt)));
printf("time: %d\n", timediff);
printf("\t\t\t\tres: %d\n", res);
}
}
/*
* A fixup to check if any pktcnt has been reset, and to fix the
* byteorder bugs in mrouted 3.6 on little-endian machines.
*/
void
fixup_stats(struct resp_buf *basep, struct resp_buf *prev, struct resp_buf *new)
{
int rno = basep->len;
struct tr_resp *b = basep->resps + rno;
struct tr_resp *p = prev->resps + rno;
struct tr_resp *n = new->resps + rno;
int *r = reset + rno;
int *s = swaps + rno;
int res;
/* Check for byte-swappers */
while (--rno >= 0) {
--n; --p; --b; --s;
if (*s || (ntohl(n->tr_vifout) - ntohl(p->tr_vifout)) > 100000) {
/* This host sends byteswapped reports; swap 'em */
if (!*s) {
*s = 1;
b->tr_qarr = byteswap(b->tr_qarr);
b->tr_vifin = byteswap(b->tr_vifin);
b->tr_vifout = byteswap(b->tr_vifout);
b->tr_pktcnt = byteswap(b->tr_pktcnt);
}
n->tr_qarr = byteswap(n->tr_qarr);
n->tr_vifin = byteswap(n->tr_vifin);
n->tr_vifout = byteswap(n->tr_vifout);
n->tr_pktcnt = byteswap(n->tr_pktcnt);
}
}
rno = basep->len;
b = basep->resps + rno;
p = prev->resps + rno;
n = new->resps + rno;
while (--rno >= 0) {
--n; --p; --b; --r;
res = ((ntohl(n->tr_pktcnt) < ntohl(b->tr_pktcnt)) ||
(ntohl(n->tr_pktcnt) < ntohl(p->tr_pktcnt)));
if (debug > 2)
printf("\t\tr=%d, res=%d\n", *r, res);
if (*r) {
if (res || *r > 1) {
/*
* This router appears to be a 3.4 with that nasty ol'
* neighbor version bug, which causes it to constantly
* reset. Just nuke the statistics for this node, and
* don't even bother giving it the benefit of the
* doubt from now on.
*/
p->tr_pktcnt = b->tr_pktcnt = n->tr_pktcnt;
r++;
} else {
/*
* This is simply the situation that the original
* fixup_stats was meant to deal with -- that a
* 3.3 or 3.4 router deleted a cache entry while
* traffic was still active.
*/
*r = 0;
break;
}
} else
*r = res;
}
if (rno < 0) return;
rno = basep->len;
b = basep->resps + rno;
p = prev->resps + rno;
while (--rno >= 0) (--b)->tr_pktcnt = (--p)->tr_pktcnt;
}
/*
* Print responses with statistics for forward path (from src to dst)
*/
int
print_stats(struct resp_buf *basep, struct resp_buf *prev, struct resp_buf *new)
{
int rtt, hop;
const char *ms;
char *s1;
u_int32_t smask;
int rno = basep->len - 1;
struct tr_resp *b = basep->resps + rno;
struct tr_resp *p = prev->resps + rno;
struct tr_resp *n = new->resps + rno;
int *r = reset + rno;
u_long resptime = new->rtime;
u_long qarrtime = fixtime(ntohl(n->tr_qarr));
u_int ttl = n->tr_fttl;
int first = (basep == prev);
VAL_TO_MASK(smask, b->tr_smask);
printf(" Source Response Dest");
printf(" Packet Statistics For Only For Traffic\n");
s1 = inet_fmt(qsrc);
printf("%-15s %-15s All Multicast Traffic From %s\n",
((b->tr_inaddr & smask) == (qsrc & smask)) ? s1 : " * * * ",
inet_fmt(basep->qhdr.tr_raddr), s1);
rtt = t_diff(resptime, new->qtime);
ms = scale(&rtt);
printf(" %c __/ rtt%5d%s Lost/Sent = Pct Rate To %s\n",
first ? 'v' : '|', rtt, ms, inet_fmt(qgrp));
if (!first) {
hop = t_diff(resptime, qarrtime);
ms = scale(&hop);
printf(" v / hop%5d%s", hop, ms);
printf(" --------------------- --------------------\n");
}
if (debug > 2) {
printf("\t\t\t\tv_in: %ld ", (long)ntohl(n->tr_vifin));
printf("v_out: %ld ", (long)ntohl(n->tr_vifout));
printf("pkts: %ld\n", (long)ntohl(n->tr_pktcnt));
printf("\t\t\t\tv_in: %ld ", (long)ntohl(b->tr_vifin));
printf("v_out: %ld ", (long)ntohl(b->tr_vifout));
printf("pkts: %ld\n", (long)ntohl(b->tr_pktcnt));
printf("\t\t\t\tv_in: %ld ",
(long)(ntohl(n->tr_vifin) - ntohl(b->tr_vifin)));
printf("v_out: %ld ",
(long)(ntohl(n->tr_vifout) - ntohl(b->tr_vifout)));
printf("pkts: %ld\n",
(long)(ntohl(n->tr_pktcnt) - ntohl(b->tr_pktcnt)));
printf("\t\t\t\treset: %d\n", *r);
}
while (TRUE) {
if ((n->tr_inaddr != b->tr_inaddr) || (p->tr_inaddr != b->tr_inaddr))
return 1; /* Route changed */
if ((n->tr_inaddr != n->tr_outaddr))
printf("%-15s\n", inet_fmt(n->tr_inaddr));
printf("%-15s %-14s %s\n", inet_fmt(n->tr_outaddr), names[rno],
flag_type(n->tr_rflags));
if (rno-- < 1) break;
printf(" %c ^ ttl%5d ", first ? 'v' : '|', ttl);
stat_line(p, n, TRUE, r);
if (!first) {
resptime = qarrtime;
qarrtime = fixtime(ntohl((n-1)->tr_qarr));
hop = t_diff(resptime, qarrtime);
ms = scale(&hop);
printf(" v | hop%5d%s", hop, ms);
stat_line(b, n, TRUE, r);
}
--b, --p, --n, --r;
if (ttl < n->tr_fttl) ttl = n->tr_fttl;
else ++ttl;
}
printf(" %c \\__ ttl%5d ", first ? 'v' : '|', ttl);
stat_line(p, n, FALSE, r);
if (!first) {
hop = t_diff(qarrtime, new->qtime);
ms = scale(&hop);
printf(" v \\ hop%5d%s", hop, ms);
stat_line(b, n, FALSE, r);
}
printf("%-15s %s\n", inet_fmt(qdst), inet_fmt(lcl_addr));
printf(" Receiver Query Source\n\n");
return 0;
}
/***************************************************************************
* main
***************************************************************************/
int
main(int argc, char **argv)
{
int udp;
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
int recvlen;
struct timeval tv;
struct resp_buf *prev, *new;
struct tr_resp *r;
u_int32_t smask;
int rno;
int hops, nexthop, tries;
u_int32_t lastout = 0;
int numstats = 1;
int waittime;
if (geteuid() != 0) {
fprintf(stderr, "mtrace: must be root\n");
exit(1);
}
init_igmp();
if (setuid(getuid()) == -1)
logit(LOG_ERR, errno, "setuid");
argv++, argc--;
if (argc == 0) goto usage;
while (argc > 0 && *argv[0] == '-') {
const char *p = *argv++; argc--;
p++;
do {
char c = *p++;
const char *arg = (char *) 0;
if (isdigit((unsigned char)*p)) {
arg = p;
p = "";
} else if (argc > 0) arg = argv[0];
switch (c) {
case 'd': /* Unlisted debug print option */
if (arg && isdigit((unsigned char)*arg)) {
debug = atoi(arg);
if (debug < 0) debug = 0;
if (debug > 3) debug = 3;
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 'M': /* Use multicast for response */
multicast = TRUE;
break;
case 'l': /* Loop updating stats indefinitely */
numstats = 3153600;
break;
case 'n': /* Don't reverse map host addresses */
numeric = TRUE;
break;
case 'p': /* Passive listen for traces */
passive = TRUE;
break;
case 'v': /* Verbosity */
verbose = TRUE;
break;
case 's': /* Short form, don't wait for stats */
numstats = 0;
break;
case 'w': /* Time to wait for packet arrival */
if (arg && isdigit((unsigned char)*arg)) {
timeout = atoi(arg);
if (timeout < 1) timeout = 1;
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 'm': /* Max number of hops to trace */
if (arg && isdigit((unsigned char)*arg)) {
qno = atoi(arg);
if (qno > MAXHOPS) qno = MAXHOPS;
else if (qno < 1) qno = 0;
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 'q': /* Number of query retries */
if (arg && isdigit((unsigned char)*arg)) {
nqueries = atoi(arg);
if (nqueries < 1) nqueries = 1;
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 'g': /* Last-hop gateway (dest of query) */
if (arg && (gwy = host_addr(arg))) {
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 't': /* TTL for query packet */
if (arg && isdigit((unsigned char)*arg)) {
qttl = atoi(arg);
if (qttl < 1) qttl = 1;
rttl = qttl;
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 'r': /* Dest for response packet */
if (arg && (raddr = host_addr(arg))) {
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 'i': /* Local interface address */
if (arg && (lcl_addr = host_addr(arg))) {
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
case 'S': /* Stat accumulation interval */
if (arg && isdigit((unsigned char)*arg)) {
statint = atoi(arg);
if (statint < 1) statint = 1;
if (arg == argv[0]) argv++, argc--;
break;
} else
goto usage;
default:
goto usage;
}
} while (*p);
}
if (argc > 0 && (qsrc = host_addr(argv[0]))) { /* Source of path */
if (IN_MULTICAST(ntohl(qsrc))) goto usage;
argv++, argc--;
if (argc > 0 && (qdst = host_addr(argv[0]))) { /* Dest of path */
argv++, argc--;
if (argc > 0 && (qgrp = host_addr(argv[0]))) { /* Path via group */
argv++, argc--;
}
if (IN_MULTICAST(ntohl(qdst))) {
u_int32_t temp = qdst;
qdst = qgrp;
qgrp = temp;
if (IN_MULTICAST(ntohl(qdst))) goto usage;
} else if (qgrp && !IN_MULTICAST(ntohl(qgrp))) goto usage;
}
}
if (passive) {
passive_mode();
return(0);
}
if (argc > 0 || qsrc == 0) {
usage: printf("\
Usage: mtrace [-Mlnps] [-w wait] [-m max_hops] [-q nqueries] [-g gateway]\n\
[-S statint] [-t ttl] [-r resp_dest] [-i if_addr] source [receiver] [group]\n");
exit(1);
}
/*
* Set useful defaults for as many parameters as possible.
*/
defgrp = htonl(0xE0020001); /* MBone Audio (224.2.0.1) */
query_cast = htonl(0xE0000002); /* All routers multicast addr */
resp_cast = htonl(0xE0000120); /* Mtrace response multicast addr */
if (qgrp == 0) qgrp = defgrp;
/*
* Get default local address for multicasts to use in setting defaults.
*/
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
#if (defined(BSD) && (BSD >= 199103))
addr.sin_len = sizeof(addr);
#endif
addr.sin_addr.s_addr = qgrp;
addr.sin_port = htons(2000); /* Any port above 1024 will do */
if (((udp = socket(AF_INET, SOCK_DGRAM, 0)) < 0) ||
(connect(udp, (struct sockaddr *) &addr, sizeof(addr)) < 0) ||
getsockname(udp, (struct sockaddr *) &addr, &addrlen) < 0) {
perror("Determining local address");
exit(1);
}
#ifdef SUNOS5
/*
* SunOS 5.X prior to SunOS 2.6, getsockname returns 0 for udp socket.
* This call to sysinfo will return the hostname.
* If the default multicast interfface (set with the route
* for 224.0.0.0) is not the same as the hostname,
* mtrace -i [if_addr] will have to be used.
*/
if (addr.sin_addr.s_addr == 0) {
char myhostname[MAXHOSTNAMELEN];
struct hostent *hp;
int error;
error = sysinfo(SI_HOSTNAME, myhostname, sizeof(myhostname));
if (error == -1) {
perror("Getting my hostname");
exit(1);
}
hp = gethostbyname(myhostname);
if (hp == NULL || hp->h_addrtype != AF_INET ||
hp->h_length != sizeof(addr.sin_addr)) {
perror("Finding IP address for my hostname");
exit(1);
}
memcpy((char *)&addr.sin_addr.s_addr, hp->h_addr,
sizeof(addr.sin_addr.s_addr));
}
#endif
/*
* Default destination for path to be queried is the local host.
*/
if (qdst == 0) qdst = lcl_addr ? lcl_addr : addr.sin_addr.s_addr;
dst_netmask = get_netmask(udp, qdst);
close(udp);
if (lcl_addr == 0) lcl_addr = addr.sin_addr.s_addr;
/*
* Protect against unicast queries to mrouted versions that might crash.
*/
if (gwy && !IN_MULTICAST(ntohl(gwy)))
if (send_recv(gwy, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS2, 1, &incr[0])) {
int version = ntohl(incr[0].igmp.igmp_group.s_addr) & 0xFFFF;
if (version == 0x0303 || version == 0x0503) {
printf("Don't use -g to address an mrouted 3.%d, it might crash\n",
(version >> 8) & 0xFF);
exit(0);
}
}
printf("Mtrace from %s to %s via group %s\n",
inet_fmt(qsrc), inet_fmt(qdst),
inet_fmt(qgrp));
if ((qdst & dst_netmask) == (qsrc & dst_netmask)) {
printf("Source & receiver are directly connected, no path to trace\n");
exit(0);
}
/*
* If the response is to be a multicast address, make sure we
* are listening on that multicast address.
*/
if (raddr) {
if (IN_MULTICAST(ntohl(raddr))) k_join(raddr, lcl_addr);
} else k_join(resp_cast, lcl_addr);
/*
* If the destination is on the local net, the last-hop router can
* be found by multicast to the all-routers multicast group.
* Otherwise, use the group address that is the subject of the
* query since by definition the last-hop router will be a member.
* Set default TTLs for local remote multicasts.
*/
restart:
if (gwy == 0)
if ((qdst & dst_netmask) == (lcl_addr & dst_netmask)) tdst = query_cast;
else tdst = qgrp;
else tdst = gwy;
if (IN_MULTICAST(ntohl(tdst))) {
k_set_loop(1); /* If I am running on a router, I need to hear this */
if (tdst == query_cast) k_set_ttl(qttl ? qttl : 1);
else k_set_ttl(qttl ? qttl : MULTICAST_TTL1);
}
/*
* Try a query at the requested number of hops or MAXHOPS if unspecified.
*/
if (qno == 0) {
hops = MAXHOPS;
tries = 1;
printf("Querying full reverse path... ");
fflush(stdout);
} else {
hops = qno;
tries = nqueries;
printf("Querying reverse path, maximum %d hops... ", qno);
fflush(stdout);
}
base.rtime = 0;
base.len = 0;
recvlen = send_recv(tdst, IGMP_MTRACE_QUERY, hops, tries, &base);
/*
* If the initial query was successful, print it. Otherwise, if
* the query max hop count is the default of zero, loop starting
* from one until there is no response for four hops. The extra
* hops allow getting past an mtrace-capable mrouter that can't
* send multicast packets because all phyints are disabled.
*/
if (recvlen) {
printf("\n 0 ");
print_host(qdst);
printf("\n");
print_trace(1, &base);
r = base.resps + base.len - 1;
if (r->tr_rflags == TR_OLD_ROUTER || r->tr_rflags == TR_NO_SPACE ||
qno != 0) {
printf("%3d ", -(base.len+1));
what_kind(&base, r->tr_rflags == TR_OLD_ROUTER ?
"doesn't support mtrace"
: "is the next hop");
} else {
VAL_TO_MASK(smask, r->tr_smask);
if ((r->tr_inaddr & smask) == (qsrc & smask)) {
printf("%3d ", -(base.len+1));
print_host(qsrc);
printf("\n");
}
}
} else if (qno == 0) {
printf("switching to hop-by-hop:\n 0 ");
print_host(qdst);
printf("\n");
for (hops = 1, nexthop = 1; hops <= MAXHOPS; ++hops) {
printf("%3d ", -hops);
fflush(stdout);
/*
* After a successful first hop, try switching to the unicast
* address of the last-hop router instead of multicasting the
* trace query. This should be safe for mrouted versions 3.3
* and 3.5 because there is a long route timeout with metric
* infinity before a route disappears. Switching to unicast
* reduces the amount of multicast traffic and avoids a bug
* with duplicate suppression in mrouted 3.5.
*/
if (hops == 2 && gwy == 0 &&
(recvlen = send_recv(lastout, IGMP_MTRACE_QUERY, hops, 1, &base)))
tdst = lastout;
else recvlen = send_recv(tdst, IGMP_MTRACE_QUERY, hops, nqueries, &base);
if (recvlen == 0) {
if (hops == 1) break;
if (hops == nexthop) {
if (what_kind(&base, "didn't respond")) {
/* the ask_neighbors determined that the
* not-responding router is the first-hop. */
break;
}
} else if (hops < nexthop + 3) {
printf("\n");
} else {
printf("...giving up\n");
break;
}
continue;
}
r = base.resps + base.len - 1;
if (base.len == hops &&
(hops == 1 || (base.resps+nexthop-2)->tr_outaddr == lastout)) {
if (hops == nexthop) {
print_trace(-hops, &base);
} else {
printf("\nResuming...\n");
print_trace(nexthop, &base);
}
} else {
if (base.len < hops) {
/*
* A shorter trace than requested means a fatal error
* occurred along the path, or that the route changed
* to a shorter one.
*
* If the trace is longer than the last one we received,
* then we are resuming from a skipped router (but there
* is still probably a problem).
*
* If the trace is shorter than the last one we
* received, then the route must have changed (and
* there is still probably a problem).
*/
if (nexthop <= base.len) {
printf("\nResuming...\n");
print_trace(nexthop, &base);
} else if (nexthop > base.len + 1) {
hops = base.len;
printf("\nRoute must have changed...\n");
print_trace(1, &base);
}
} else {
/*
* The last hop address is not the same as it was;
* the route probably changed underneath us.
*/
hops = base.len;
printf("\nRoute must have changed...\n");
print_trace(1, &base);
}
}
lastout = r->tr_outaddr;
if (base.len < hops ||
r->tr_rmtaddr == 0 ||
(r->tr_rflags & 0x80)) {
VAL_TO_MASK(smask, r->tr_smask);
if (r->tr_rmtaddr) {
if (hops != nexthop) {
printf("\n%3d ", -(base.len+1));
}
what_kind(&base, r->tr_rflags == TR_OLD_ROUTER ?
"doesn't support mtrace" :
"would be the next hop");
/* XXX could do segmented trace if TR_NO_SPACE */
} else if (r->tr_rflags == TR_NO_ERR &&
(r->tr_inaddr & smask) == (qsrc & smask)) {
printf("%3d ", -(hops + 1));
print_host(qsrc);
printf("\n");
}
break;
}
nexthop = hops + 1;
}
}
if (base.rtime == 0) {
printf("Timed out receiving responses\n");
if (IN_MULTICAST(ntohl(tdst))) {
if (tdst == query_cast)
printf("Perhaps no local router has a route for source %s\n",
inet_fmt(qsrc));
else
printf("Perhaps receiver %s is not a member of group %s,\n"
"or no router local to it has a route for source %s,\n"
"or multicast at ttl %d doesn't reach its last-hop router"
" for that source\n",
inet_fmt(qdst), inet_fmt(qgrp), inet_fmt(qsrc),
qttl ? qttl : MULTICAST_TTL1);
}
exit(1);
}
printf("Round trip time %d ms\n\n", t_diff(base.rtime, base.qtime));
/*
* Use the saved response which was the longest one received,
* and make additional probes after delay to measure loss.
*/
raddr = base.qhdr.tr_raddr;
rttl = base.qhdr.tr_rttl;
gettimeofday(&tv, 0);
waittime = statint - (((tv.tv_sec + JAN_1970) & 0xFFFF) - (base.qtime >> 16));
prev = &base;
new = &incr[numstats&1];
while (numstats--) {
if (waittime < 1) printf("\n");
else {
printf("Waiting to accumulate statistics... ");
fflush(stdout);
sleep((unsigned)waittime);
}
rno = base.len;
recvlen = send_recv(tdst, IGMP_MTRACE_QUERY, rno, nqueries, new);
if (recvlen == 0) {
printf("Timed out.\n");
exit(1);
}
if (rno != new->len) {
printf("Trace length doesn't match:\n");
/*
* XXX Should this trace result be printed, or is that
* too verbose? Perhaps it should just say restarting.
* But if the path is changing quickly, this may be the
* only snapshot of the current path. But, if the path
* is changing that quickly, does the current path really
* matter?
*/
print_trace(1, new);
printf("Restarting.\n\n");
numstats++;
goto restart;
}
printf("Results after %d seconds:\n\n",
(int)((new->qtime - base.qtime) >> 16));
fixup_stats(&base, prev, new);
if (print_stats(&base, prev, new)) {
printf("Route changed:\n");
print_trace(1, new);
printf("Restarting.\n\n");
goto restart;
}
prev = new;
new = &incr[numstats&1];
waittime = statint;
}
/*
* If the response was multicast back, leave the group
*/
if (raddr) {
if (IN_MULTICAST(ntohl(raddr))) k_leave(raddr, lcl_addr);
} else k_leave(resp_cast, lcl_addr);
return (0);
}
void
check_vif_state(void)
{
logit(LOG_WARNING, errno, "sendto");
}
/*
* Log errors and other messages to stderr, according to the severity
* of the message and the current debug level. For errors of severity
* LOG_ERR or worse, terminate the program.
*/
void
logit(int severity, int syserr, const char *format, ...)
{
va_list ap;
switch (debug) {
case 0: if (severity > LOG_WARNING) return;
/* FALLTHROUGH */
case 1: if (severity > LOG_NOTICE) return;
/* FALLTHROUGH */
case 2: if (severity > LOG_INFO ) return;
/* FALLTHROUGH */
default:
if (severity == LOG_WARNING)
fprintf(stderr, "warning - ");
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
if (syserr == 0)
fprintf(stderr, "\n");
else
fprintf(stderr, ": %s\n", strerror(syserr));
}
if (severity <= LOG_ERR) exit(1);
}
/* dummies */
void accept_probe(u_int32_t src, u_int32_t dst, char *p, int datalen,
u_int32_t level)
{
}
void accept_group_report(u_int32_t src, u_int32_t dst, u_int32_t group,
int r_type)
{
}
void accept_neighbor_request2(u_int32_t src, u_int32_t dst)
{
}
void accept_report(u_int32_t src, u_int32_t dst, char *p, int datalen,
u_int32_t level)
{
}
void accept_neighbor_request(u_int32_t src, u_int32_t dst)
{
}
void accept_prune(u_int32_t src, u_int32_t dst, char *p, int datalen)
{
}
void accept_graft(u_int32_t src, u_int32_t dst, char *p, int datalen)
{
}
void accept_g_ack(u_int32_t src, u_int32_t dst, char *p, int datalen)
{
}
void add_table_entry(u_int32_t origin, u_int32_t mcastgrp)
{
}
void accept_leave_message(u_int32_t src, u_int32_t dst, u_int32_t group)
{
}
void accept_mtrace(u_int32_t src, u_int32_t dst, u_int32_t group, char *data,
u_int no, int datalen)
{
}
void accept_membership_query(u_int32_t src, u_int32_t dst, u_int32_t group,
int tmo)
{
}
void accept_neighbors(u_int32_t src, u_int32_t dst, u_char *p, int datalen,
u_int32_t level)
{
}
void accept_neighbors2(u_int32_t src, u_int32_t dst, u_char *p, int datalen,
u_int32_t level)
{
}
void accept_info_request(u_int32_t src, u_int32_t dst, u_char *p, int datalen)
{
}
void accept_info_reply(u_int32_t src, u_int32_t dst, u_char *p, int datalen)
{
}
