NetBSD/sbin/routed/trace.c

452 lines
11 KiB
C

/* $NetBSD: trace.c,v 1.13 1995/06/20 22:28:03 christos Exp $ */
/*
* Copyright (c) 1983, 1988, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)trace.c 8.1 (Berkeley) 6/5/93";
#else
static char rcsid[] = "$NetBSD: trace.c,v 1.13 1995/06/20 22:28:03 christos Exp $";
#endif
#endif /* not lint */
/*
* Routing Table Management Daemon
*/
#define RIPCMDS
#include "defs.h"
#include <sys/stat.h>
#include <signal.h>
#include <fcntl.h>
#include "pathnames.h"
#define NRECORDS 50 /* size of circular trace buffer */
#ifdef DEBUG
FILE *ftrace = stdout;
int traceactions = 0;
#endif
static struct timeval lastlog;
static char *savetracename;
static int iftraceinit __P((struct interface *, struct ifdebug *));
void dumpif __P((FILE *, struct interface *));
void dumptrace __P((FILE *, char *, struct ifdebug *));
void
traceinit(ifp)
register struct interface *ifp;
{
if (iftraceinit(ifp, &ifp->int_input) &&
iftraceinit(ifp, &ifp->int_output))
return;
tracehistory = 0;
fprintf(stderr, "traceinit: can't init %s\n", ifp->int_name);
}
static int
iftraceinit(ifp, ifd)
struct interface *ifp;
register struct ifdebug *ifd;
{
register struct iftrace *t;
ifd->ifd_records =
(struct iftrace *)malloc(NRECORDS * sizeof (struct iftrace));
if (ifd->ifd_records == 0)
return (0);
ifd->ifd_front = ifd->ifd_records;
ifd->ifd_count = 0;
for (t = ifd->ifd_records; t < ifd->ifd_records + NRECORDS; t++) {
t->ift_size = 0;
t->ift_packet = 0;
}
ifd->ifd_if = ifp;
return (1);
}
void
traceon(file)
char *file;
{
struct stat stbuf;
if (ftrace != NULL)
return;
if (stat(file, &stbuf) >= 0 && !S_ISREG(stbuf.st_mode))
return;
savetracename = file;
(void) gettimeofday(&now, NULL);
ftrace = fopen(file, "a");
if (ftrace == NULL)
return;
dup2(fileno(ftrace), 1);
dup2(fileno(ftrace), 2);
traceactions = 1;
fprintf(ftrace, "Tracing enabled %s\n", ctime((time_t *)&now.tv_sec));
}
void
traceoff()
{
if (!traceactions)
return;
if (ftrace != NULL) {
int fd = open(_PATH_DEVNULL, O_RDWR);
fprintf(ftrace, "Tracing disabled %s\n",
ctime((time_t *)&now.tv_sec));
fflush(ftrace);
(void) dup2(fd, 1);
(void) dup2(fd, 2);
(void) close(fd);
fclose(ftrace);
ftrace = NULL;
}
traceactions = 0;
tracehistory = 0;
tracepackets = 0;
tracecontents = 0;
}
void
sigtrace(s)
int s;
{
if (s == SIGUSR2)
traceoff();
else if (ftrace == NULL && savetracename)
traceon(savetracename);
else
bumploglevel();
}
/*
* Move to next higher level of tracing when -t option processed or
* SIGUSR1 is received. Successive levels are:
* traceactions
* traceactions + tracepackets
* traceactions + tracehistory (packets and contents after change)
* traceactions + tracepackets + tracecontents
*/
void
bumploglevel()
{
(void) gettimeofday(&now, NULL);
if (traceactions == 0) {
traceactions++;
if (ftrace)
fprintf(ftrace, "Tracing actions started %s\n",
ctime((time_t *)&now.tv_sec));
} else if (tracepackets == 0) {
tracepackets++;
tracehistory = 0;
tracecontents = 0;
if (ftrace)
fprintf(ftrace, "Tracing packets started %s\n",
ctime((time_t *)&now.tv_sec));
} else if (tracehistory == 0) {
tracehistory++;
if (ftrace)
fprintf(ftrace, "Tracing history started %s\n",
ctime((time_t *)&now.tv_sec));
} else {
tracepackets++;
tracecontents++;
tracehistory = 0;
if (ftrace)
fprintf(ftrace, "Tracing packet contents started %s\n",
ctime((time_t *)&now.tv_sec));
}
if (ftrace)
fflush(ftrace);
}
void
trace(ifd, who, p, len, m)
register struct ifdebug *ifd;
struct sockaddr *who;
char *p;
int len, m;
{
register struct iftrace *t;
if (ifd->ifd_records == 0)
return;
t = ifd->ifd_front++;
if (ifd->ifd_front >= ifd->ifd_records + NRECORDS)
ifd->ifd_front = ifd->ifd_records;
if (ifd->ifd_count < NRECORDS)
ifd->ifd_count++;
if (t->ift_size > 0 && t->ift_size < len && t->ift_packet) {
free(t->ift_packet);
t->ift_packet = 0;
}
t->ift_stamp = now;
t->ift_who = *who;
if (len > 0 && t->ift_packet == 0) {
t->ift_packet = malloc(len);
if (t->ift_packet == 0)
len = 0;
}
if (len > 0)
memcpy(t->ift_packet, p, len);
t->ift_size = len;
t->ift_metric = m;
}
void
traceaction(fd, action, rt)
FILE *fd;
char *action;
struct rt_entry *rt;
{
struct sockaddr_in *dst, *gate, *netmask;
static struct bits {
int t_bits;
char *t_name;
} flagbits[] = {
{ RTF_UP, "UP" },
{ RTF_GATEWAY, "GATEWAY" },
{ RTF_HOST, "HOST" },
{ 0 }
}, statebits[] = {
{ RTS_PASSIVE, "PASSIVE" },
{ RTS_REMOTE, "REMOTE" },
{ RTS_INTERFACE,"INTERFACE" },
{ RTS_CHANGED, "CHANGED" },
{ RTS_INTERNAL, "INTERNAL" },
{ RTS_EXTERNAL, "EXTERNAL" },
{ RTS_SUBNET, "SUBNET" },
{ 0 }
};
register struct bits *p;
register int first;
char *cp;
if (fd == NULL)
return;
if (lastlog.tv_sec != now.tv_sec || lastlog.tv_usec != now.tv_usec) {
fprintf(fd, "\n%.19s:\n", ctime((time_t *)&now.tv_sec));
lastlog = now;
}
fprintf(fd, "%s ", action);
dst = (struct sockaddr_in *)&rt->rt_dst;
gate = (struct sockaddr_in *)&rt->rt_router;
netmask = (struct sockaddr_in *)&rt->rt_netmask;
fprintf(fd, "dst %s, ", inet_ntoa(dst->sin_addr));
fprintf(fd, "router %s, ", inet_ntoa(gate->sin_addr));
fprintf(fd, " netmask %s, metric %d, flags",
inet_ntoa(netmask->sin_addr), rt->rt_metric);
cp = " %s";
for (first = 1, p = flagbits; p->t_bits > 0; p++) {
if ((rt->rt_flags & p->t_bits) == 0)
continue;
fprintf(fd, cp, p->t_name);
if (first) {
cp = "|%s";
first = 0;
}
}
fprintf(fd, " state");
cp = " %s";
for (first = 1, p = statebits; p->t_bits > 0; p++) {
if ((rt->rt_state & p->t_bits) == 0)
continue;
fprintf(fd, cp, p->t_name);
if (first) {
cp = "|%s";
first = 0;
}
}
fprintf(fd, " timer %d\n", rt->rt_timer);
if (tracehistory && !tracepackets &&
(rt->rt_state & RTS_PASSIVE) == 0 && rt->rt_ifp)
dumpif(fd, rt->rt_ifp);
fflush(fd);
if (ferror(fd))
traceoff();
}
void
tracenewmetric(fd, rt, newmetric)
FILE *fd;
struct rt_entry *rt;
int newmetric;
{
struct sockaddr_in *dst, *gate;
if (fd == NULL)
return;
if (lastlog.tv_sec != now.tv_sec || lastlog.tv_usec != now.tv_usec) {
fprintf(fd, "\n%.19s:\n", ctime((time_t *)&now.tv_sec));
lastlog = now;
}
dst = (struct sockaddr_in *)&rt->rt_dst;
gate = (struct sockaddr_in *)&rt->rt_router;
fprintf(fd, "CHANGE metric dst %s, ", inet_ntoa(dst->sin_addr));
fprintf(fd, "router %s, from %d to %d\n",
inet_ntoa(gate->sin_addr), rt->rt_metric, newmetric);
fflush(fd);
if (ferror(fd))
traceoff();
}
void
dumpif(fd, ifp)
FILE *fd;
register struct interface *ifp;
{
if (ifp->int_input.ifd_count || ifp->int_output.ifd_count) {
fprintf(fd, "*** Packet history for interface %s ***\n",
ifp->int_name);
#ifdef notneeded
dumptrace(fd, "to", &ifp->int_output);
#endif
dumptrace(fd, "from", &ifp->int_input);
fprintf(fd, "*** end packet history ***\n");
}
}
void
dumptrace(fd, dir, ifd)
FILE *fd;
char *dir;
register struct ifdebug *ifd;
{
register struct iftrace *t;
char *cp = !strcmp(dir, "to") ? "Output" : "Input";
if (ifd->ifd_front == ifd->ifd_records &&
ifd->ifd_front->ift_size == 0) {
fprintf(fd, "%s: no packets.\n", cp);
fflush(fd);
return;
}
fprintf(fd, "%s trace:\n", cp);
t = ifd->ifd_front - ifd->ifd_count;
if (t < ifd->ifd_records)
t += NRECORDS;
for ( ; ifd->ifd_count; ifd->ifd_count--, t++) {
if (t >= ifd->ifd_records + NRECORDS)
t = ifd->ifd_records;
if (t->ift_size == 0)
continue;
dumppacket(fd, dir, (struct sockaddr_in *)&t->ift_who,
t->ift_packet, t->ift_size, &t->ift_stamp);
}
}
void
dumppacket(fd, dir, who, cp, size, stamp)
FILE *fd;
struct sockaddr_in *who; /* should be sockaddr */
char *dir, *cp;
register int size;
struct timeval *stamp;
{
register struct rip *msg = (struct rip *)cp;
register struct netinfo *n;
if (fd == NULL)
return;
if (msg->rip_cmd && msg->rip_cmd < RIPCMD_MAX)
fprintf(fd, "%s %s %s.%d %.19s:\n", ripcmds[msg->rip_cmd],
dir, inet_ntoa(who->sin_addr), ntohs(who->sin_port),
ctime((time_t *)&stamp->tv_sec));
else {
fprintf(fd, "Bad cmd 0x%x %s %s.%d %.19s\n", msg->rip_cmd,
dir, inet_ntoa(who->sin_addr), ntohs(who->sin_port),
ctime((time_t *)&stamp->tv_sec));
fprintf(fd, "size=%d cp=%lx packet=%lx\n", size,
(u_long) cp, (u_long) packet);
fflush(fd);
return;
}
if (tracepackets && tracecontents == 0) {
fflush(fd);
return;
}
switch (msg->rip_cmd) {
case RIPCMD_REQUEST:
case RIPCMD_RESPONSE:
size -= 4 * sizeof (char);
n = msg->rip_nets;
for (; size > 0; n++, size -= sizeof (struct netinfo)) {
if (size < sizeof (struct netinfo)) {
fprintf(fd, "(truncated record, len %d)\n",
size);
break;
}
switch (n->rip_family) {
case AF_INET:
{
struct sockaddr_in sa;
sa.sin_addr.s_addr = n->rip_dst;
fprintf(fd, "\tdst %s",
inet_ntoa(sa.sin_addr));
if (msg->rip_vers > RIP_VERSION_1) {
fprintf(fd, ", mask 0x%.8x",
n->rip_netmask);
sa.sin_addr.s_addr =
n->rip_router;
fprintf(fd, ", router %s",
inet_ntoa(sa.sin_addr));
}
}
break;
default:
fprintf(fd, "\taf %d?", n->rip_family);
break;
}
fprintf(fd, ", metric %d\n", ntohl(n->rip_metric));
}
break;
case RIPCMD_TRACEON:
fprintf(fd, "\tfile=%*s\n", size, msg->rip_tracefile);
break;
case RIPCMD_TRACEOFF:
break;
}
fflush(fd);
if (ferror(fd))
traceoff();
}