usr/src/sbin/routed/trace.c

/*
 * Copyright (c) 1983, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#ifndef lint
static char sccsid[] = "@(#)trace.c     5.5 (Berkeley) %G%";
#endif /* not lint */

/*
 * Routing Table Management Daemon
 */
#define RIPCMDS
#include "defs.h"
#include <sys/stat.h>
#include <sys/signal.h>

#define NRECORDS        50              /* size of circular trace buffer */
#ifdef DEBUG
FILE    *ftrace = stdout;
int     traceactions = 1;
#endif

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
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);
}

traceon(file)
        char *file;
{
        struct stat stbuf;

        if (ftrace != NULL)
                return;
        if (stat(file, &stbuf) >= 0 && (stbuf.st_mode & S_IFMT) != S_IFREG)
                return;
        ftrace = fopen(file, "a");
        if (ftrace == NULL)
                return;
        dup2(fileno(ftrace), 1);
        dup2(fileno(ftrace), 2);
        traceactions = 1;
}

traceoff()
{
        if (!traceactions)
                return;
        if (ftrace != NULL)
                fclose(ftrace);
        ftrace = NULL;
        traceactions = 0;
        tracehistory = 0;
}

sigtrace(s)
        int s;
{
        if (s == SIGUSR2) {
                traceoff();
                tracepackets = 0;
        } else if (traceactions == 0)
                traceactions++;
        else if (tracehistory == 0)
                tracehistory++;
        else {
                tracepackets++;
                tracehistory = 0;
        }
}

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 = time(0);
        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)
                bcopy(p, t->ift_packet, len);
        t->ift_size = len;
        t->ift_metric = m;
}

traceaction(fd, action, rt)
        FILE *fd;
        char *action;
        struct rt_entry *rt;
{
        struct sockaddr_in *dst, *gate;
        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;
        struct interface *ifp;

        if (fd == NULL)
                return;
        if (curtime) {
                fprintf(fd, "\n%s", curtime);
                curtime = NULL;
        }
        fprintf(fd, "%s ", action);
        dst = (struct sockaddr_in *)&rt->rt_dst;
        gate = (struct sockaddr_in *)&rt->rt_router;
        fprintf(fd, "dst %s, ", inet_ntoa(dst->sin_addr));
        fprintf(fd, "router %s, metric %d, flags",
             inet_ntoa(gate->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 (!tracepackets && (rt->rt_state & RTS_PASSIVE) == 0 && rt->rt_ifp)
                dumpif(fd, rt->rt_ifp);
        fflush(fd);
}

tracenewmetric(fd, rt, newmetric)
        FILE *fd;
        struct rt_entry *rt;
        int newmetric;
{
        struct sockaddr_in *dst, *gate;

        if (fd == NULL)
                return;
        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);
}

dumpif(fd, ifp)
        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");
        }
        fflush(fd);
}

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, &t->ift_who, t->ift_packet, t->ift_size,
                    &t->ift_stamp);
        }
}

dumppacket(fd, dir, who, cp, size, tstamp)
        FILE *fd;
        struct sockaddr_in *who;                /* should be sockaddr */
        char *dir, *cp;
        register int size;
        time_t *tstamp;
{
        register struct rip *msg = (struct rip *)cp;
        register struct netinfo *n;

        if (msg->rip_cmd && msg->rip_cmd < RIPCMD_MAX)
                fprintf(fd, "%s %s %s.%d", ripcmds[msg->rip_cmd],
                    dir, inet_ntoa(who->sin_addr), ntohs(who->sin_port));
        else {
                fprintf(fd, "Bad cmd 0x%x %s %x.%d %.24s\n", msg->rip_cmd,
                    dir, inet_ntoa(who->sin_addr), ntohs(who->sin_port),
                    ctime(tstamp));
                fprintf(fd, "size=%d cp=%x packet=%x\n", size, cp, packet);
                fflush(fd);
                return;
        }
        fprintf(fd, " %.24s:\n", ctime(tstamp));
        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))
                                break;
                        fprintf(fd, "\tdst %s metric %d\n",
#define satosin(sa)     ((struct sockaddr_in *)&sa)
                             inet_ntoa(satosin(n->rip_dst)->sin_addr),
                             ntohl(n->rip_metric));
                }
                break;

        case RIPCMD_TRACEON:
                fprintf(fd, "\tfile=%*s\n", size, msg->rip_tracefile);
                break;

        case RIPCMD_TRACEOFF:
                break;
        }
        fflush(fd);
}