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-rw-r--r--usr.sbin/rtsold/rtsold.c620
1 files changed, 620 insertions, 0 deletions
diff --git a/usr.sbin/rtsold/rtsold.c b/usr.sbin/rtsold/rtsold.c
new file mode 100644
index 00000000000..214e629bff3
--- /dev/null
+++ b/usr.sbin/rtsold/rtsold.c
@@ -0,0 +1,620 @@
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * 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/types.h>
+#include <sys/time.h>
+
+#include <net/if_dl.h>
+
+#include <netinet/in.h>
+#include <netinet/icmp6.h>
+
+#include <signal.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <err.h>
+#include <stdarg.h>
+#include "rtsold.h"
+
+struct ifinfo *iflist;
+struct timeval tm_max = {0x7fffffff, 0x7fffffff};
+int dflag;
+static int log_upto = 999;
+static int fflag = 0;
+
+/* protocol constatns */
+#define MAX_RTR_SOLICITATION_DELAY 1 /* second */
+#define RTR_SOLICITATION_INTERVAL 4 /* seconds */
+#define MAX_RTR_SOLICITATIONS 3 /* times */
+
+/* implementation dependent constants */
+#define PROBE_INTERVAL 60 /* secondes XXX: should be configurable */
+
+/* utility macros */
+/* a < b */
+#define TIMEVAL_LT(a, b) (((a).tv_sec < (b).tv_sec) ||\
+ (((a).tv_sec == (b).tv_sec) && \
+ ((a).tv_usec < (b).tv_usec)))
+
+/* a <= b */
+#define TIMEVAL_LEQ(a, b) (((a).tv_sec < (b).tv_sec) ||\
+ (((a).tv_sec == (b).tv_sec) &&\
+ ((a).tv_usec <= (b).tv_usec)))
+
+/* a == b */
+#define TIMEVAL_EQ(a, b) (((a).tv_sec==(b).tv_sec) && ((a).tv_usec==(b).tv_usec))
+
+int main __P((int argc, char *argv[]));
+
+/* static variables and functions */
+static int mobile_node = 0;
+static int do_dump;
+static char *dumpfilename = "/var/tmp/rtsold.dump"; /* XXX: should be configurable */
+static char *pidfilename = "/var/run/rtsold.pid"; /* should be configurable */
+
+static int ifconfig __P((char *ifname));
+static int make_packet __P((struct ifinfo *ifinfo));
+static struct timeval *rtsol_check_timer __P((void));
+static void TIMEVAL_ADD __P((struct timeval *a, struct timeval *b,
+ struct timeval *result));
+static void TIMEVAL_SUB __P((struct timeval *a, struct timeval *b,
+ struct timeval *result));
+
+static void rtsold_set_dump_file __P(());
+static void usage __P((char *progname));
+
+int
+main(argc, argv)
+ int argc;
+ char *argv[];
+{
+ int s, ch;
+ int once = 0;
+ struct timeval *timeout;
+ struct fd_set fdset;
+ char *argv0;
+ char *opts;
+
+ /*
+ * Initialization
+ */
+ argv0 = argv[0];
+
+ /* get option */
+ if (argv0 && argv0[strlen(argv0) - 1] != 'd') {
+ fflag = 1;
+ once = 1;
+ opts = "dD";
+ } else
+ opts = "dDfm1";
+
+ while ((ch = getopt(argc, argv, opts)) != -1) {
+ switch(ch) {
+ case 'd':
+ dflag = 1;
+ break;
+ case 'D':
+ dflag = 2;
+ break;
+ case 'f':
+ fflag = 1;
+ break;
+ case 'm':
+ mobile_node = 1;
+ break;
+ case '1':
+ once = 1;
+ break;
+ default:
+ usage(argv0);
+ }
+ }
+ argc -= optind;
+ argv += optind;
+ if (argc == 0)
+ usage(argv0);
+
+ /* set log level */
+ if (dflag == 0)
+ log_upto = LOG_NOTICE;
+ if (!fflag) {
+ char *ident;
+ ident = strrchr(argv0, '/');
+ if (!ident)
+ ident = argv0;
+ else
+ ident++;
+ openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
+ if (log_upto >= 0)
+ setlogmask(LOG_UPTO(log_upto));
+ }
+
+ /* random value initilization */
+ srandom((u_long)time(NULL));
+
+ /* warn if accept_rtadv is down */
+ if (!getinet6sysctl(IPV6CTL_ACCEPT_RTADV))
+ warnx("kernel is configured not to accept RAs");
+
+ /* initialization to dump internal status to a file */
+ if (signal(SIGUSR1, (void *)rtsold_set_dump_file) < 0)
+ errx(1, "failed to set signal for dump status");
+
+ /* configuration per interface */
+ if (ifinit())
+ errx(1, "failed to initilizatoin interfaces");
+ while (argc--) {
+ if (ifconfig(*argv))
+ errx(1, "failed to initilize %s", *argv);
+ argv++;
+ }
+
+ /* open a socket for sending RS and receiving RA */
+ if ((s = sockopen()) < 0)
+ errx(1, "failed to open a socket");
+
+ /* setup for probing default routers */
+ if (probe_init())
+ errx(1, "failed to setup for probing routers");
+
+ if (!fflag)
+ daemon(0, 0); /* act as a daemon */
+
+ /* dump the current pid */
+ if (!once) {
+ pid_t pid = getpid();
+ FILE *fp;
+
+ if ((fp = fopen(pidfilename, "w")) == NULL)
+ warnmsg(LOG_ERR, __FUNCTION__,
+ "failed to open a log file(%s)",
+ pidfilename, strerror(errno));
+ else {
+ fprintf(fp, "%d\n", pid);
+ fclose(fp);
+ }
+ }
+
+ FD_ZERO(&fdset);
+ FD_SET(s, &fdset);
+ while (1) { /* main loop */
+ extern int errno;
+ int e;
+ struct fd_set select_fd = fdset;
+
+ if (do_dump) { /* SIGUSR1 */
+ do_dump = 0;
+ rtsold_dump_file(dumpfilename);
+ }
+
+ timeout = rtsol_check_timer();
+
+ if (once) {
+ struct ifinfo *ifi;
+
+ /* if we have no timeout, we are done (or failed) */
+ if (timeout == NULL)
+ break;
+
+ /* if all interfaces have got RA packet, we are done */
+ for (ifi = iflist; ifi; ifi = ifi->next) {
+ if (ifi->state != IFS_DOWN && ifi->racnt == 0)
+ break;
+ }
+ if (ifi == NULL)
+ break;
+ }
+
+ if ((e = select(s + 1, &select_fd, NULL, NULL, timeout)) < 1) {
+ if (e < 0 && errno != EINTR) {
+ warnmsg(LOG_ERR, __FUNCTION__, "select: %s",
+ strerror(errno));
+ }
+ continue;
+ }
+
+ /* packet reception */
+ if (FD_ISSET(s, &fdset))
+ rtsol_input(s);
+ }
+ /* NOTREACHED */
+
+ return 0;
+}
+
+static int
+ifconfig(char *ifname)
+{
+ struct ifinfo *ifinfo;
+ struct sockaddr_dl *sdl;
+ int flags;
+
+ if ((sdl = if_nametosdl(ifname)) == NULL) {
+ warnmsg(LOG_ERR, __FUNCTION__,
+ "failed to get link layer information for %s", ifname);
+ return(-1);
+ }
+ if (find_ifinfo(sdl->sdl_index)) {
+ warnmsg(LOG_ERR, __FUNCTION__,
+ "interface %s was already cofigured", ifname);
+ return(-1);
+ }
+
+ if ((ifinfo = malloc(sizeof(*ifinfo))) == NULL) {
+ warnmsg(LOG_ERR, __FUNCTION__, "memory allocation failed");
+ return(-1);
+ }
+ memset(ifinfo, 0, sizeof(*ifinfo));
+ ifinfo->sdl = sdl;
+
+ strncpy(ifinfo->ifname, ifname, sizeof(ifinfo->ifname));
+
+ /* construct a router solicitation message */
+ if (make_packet(ifinfo))
+ goto bad;
+
+ /*
+ * check if the interface is available.
+ * also check if SIOCGIFMEDIA ioctl is OK on the interface.
+ */
+ ifinfo->mediareqok = 1;
+ ifinfo->active = interface_status(ifinfo);
+ if (!ifinfo->mediareqok) {
+ /*
+ * probe routers periodically even if the link status
+ * does not change.
+ */
+ ifinfo->probeinterval = PROBE_INTERVAL;
+ }
+
+ /* activate interface: interface_up returns 0 on success */
+ flags = interface_up(ifinfo->ifname);
+ if (flags == 0)
+ ifinfo->state = IFS_DELAY;
+ else if (flags == IFS_TENTATIVE)
+ ifinfo->state = IFS_TENTATIVE;
+ else
+ ifinfo->state = IFS_DOWN;
+
+ rtsol_timer_update(ifinfo);
+
+ /* link into chain */
+ if (iflist)
+ ifinfo->next = iflist;
+ iflist = ifinfo;
+
+ return(0);
+
+ bad:
+ free(ifinfo);
+ free(ifinfo->sdl);
+ return(-1);
+}
+
+struct ifinfo *
+find_ifinfo(int ifindex)
+{
+ struct ifinfo *ifi;
+
+ for (ifi = iflist; ifi; ifi = ifi->next)
+ if (ifi->sdl->sdl_index == ifindex)
+ return(ifi);
+
+ return(NULL);
+}
+
+static int
+make_packet(struct ifinfo *ifinfo)
+{
+ char *buf;
+ struct nd_router_solicit *rs;
+ size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
+
+ if ((lladdroptlen = lladdropt_length(ifinfo->sdl)) == 0) {
+ warnmsg(LOG_INFO, __FUNCTION__,
+ "link-layer address option has null length"
+ " on %s. Treat as not included.", ifinfo->ifname);
+ }
+ packlen += lladdroptlen;
+ ifinfo->rs_datalen = packlen;
+
+ /* allocate buffer */
+ if ((buf = malloc(packlen)) == NULL) {
+ warnmsg(LOG_ERR, __FUNCTION__,
+ "memory allocation failed for %s", ifinfo->ifname);
+ return(-1);
+ }
+ ifinfo->rs_data = buf;
+
+ /* fill in the message */
+ rs = (struct nd_router_solicit *)buf;
+ rs->nd_rs_type = ND_ROUTER_SOLICIT;
+ rs->nd_rs_code = 0;
+ rs->nd_rs_cksum = 0;
+ rs->nd_rs_reserved = 0;
+ buf += sizeof(*rs);
+
+ /* fill in source link-layer address option */
+ if (lladdroptlen)
+ lladdropt_fill(ifinfo->sdl, (struct nd_opt_hdr *)buf);
+
+ return(0);
+}
+
+static struct timeval *
+rtsol_check_timer()
+{
+ static struct timeval returnval;
+ struct timeval now, rtsol_timer;
+ struct ifinfo *ifinfo;
+ int flags;
+
+ gettimeofday(&now, NULL);
+
+ rtsol_timer = tm_max;
+
+ for (ifinfo = iflist; ifinfo; ifinfo = ifinfo->next) {
+ if (TIMEVAL_LEQ(ifinfo->expire, now)) {
+ if (dflag > 1)
+ warnmsg(LOG_DEBUG, __FUNCTION__,
+ "timer expiration on %s, "
+ "state = %d", ifinfo->ifname,
+ ifinfo->state);
+
+ switch(ifinfo->state) {
+ case IFS_DOWN:
+ case IFS_TENTATIVE:
+ /* interface_up returns 0 on success */
+ flags = interface_up(ifinfo->ifname);
+ if (flags == 0)
+ ifinfo->state = IFS_DELAY;
+ else if (flags == IFS_TENTATIVE)
+ ifinfo->state = IFS_TENTATIVE;
+ else
+ ifinfo->state = IFS_DOWN;
+ break;
+ case IFS_IDLE:
+ {
+ int oldstatus = ifinfo->active;
+ int probe = 0;
+
+ ifinfo->active =
+ interface_status(ifinfo);
+
+ if (oldstatus != ifinfo->active) {
+ warnmsg(LOG_DEBUG, __FUNCTION__,
+ "%s status is changed"
+ " from %d to %d",
+ ifinfo->ifname,
+ oldstatus, ifinfo->active);
+ probe = 1;
+ ifinfo->state = IFS_DELAY;
+ }
+ else if (ifinfo->probeinterval &&
+ (ifinfo->probetimer -=
+ ifinfo->timer.tv_sec) <= 0) {
+ /* probe timer expired */
+ ifinfo->probetimer =
+ ifinfo->probeinterval;
+ probe = 1;
+ ifinfo->state = IFS_PROBE;
+ }
+
+ if (probe && mobile_node)
+ defrouter_probe(ifinfo->sdl->sdl_index);
+ break;
+ }
+ case IFS_DELAY:
+ ifinfo->state = IFS_PROBE;
+ sendpacket(ifinfo);
+ break;
+ case IFS_PROBE:
+ if (ifinfo->probes < MAX_RTR_SOLICITATIONS)
+ sendpacket(ifinfo);
+ else {
+ warnmsg(LOG_INFO, __FUNCTION__,
+ "No answer "
+ "after sending %d RSs",
+ ifinfo->probes);
+ ifinfo->probes = 0;
+ ifinfo->state = IFS_IDLE;
+ }
+ break;
+ }
+ rtsol_timer_update(ifinfo);
+ }
+
+ if (TIMEVAL_LT(ifinfo->expire, rtsol_timer))
+ rtsol_timer = ifinfo->expire;
+ }
+
+ if (TIMEVAL_EQ(rtsol_timer, tm_max)) {
+ warnmsg(LOG_DEBUG, __FUNCTION__, "there is no timer");
+ return(NULL);
+ }
+ else if (TIMEVAL_LT(rtsol_timer, now))
+ /* this may occur when the interval is too small */
+ returnval.tv_sec = returnval.tv_usec = 0;
+ else
+ TIMEVAL_SUB(&rtsol_timer, &now, &returnval);
+
+ if (dflag > 1)
+ warnmsg(LOG_DEBUG, __FUNCTION__, "New timer is %d:%08d",
+ returnval.tv_sec, returnval.tv_usec);
+
+ return(&returnval);
+}
+
+void
+rtsol_timer_update(struct ifinfo *ifinfo)
+{
+#define MILLION 1000000
+#define DADRETRY 10 /* XXX: adhoc */
+ long interval;
+ struct timeval now;
+
+ bzero(&ifinfo->timer, sizeof(ifinfo->timer));
+
+ switch (ifinfo->state) {
+ case IFS_DOWN:
+ case IFS_TENTATIVE:
+ if (++ifinfo->dadcount > DADRETRY) {
+ ifinfo->dadcount = 0;
+ ifinfo->timer.tv_sec = PROBE_INTERVAL;
+ }
+ else
+ ifinfo->timer.tv_sec = 1;
+ break;
+ case IFS_IDLE:
+ if (mobile_node) {
+ /* XXX should be configurable */
+ ifinfo->timer.tv_sec = 3;
+ }
+ else
+ ifinfo->timer = tm_max; /* stop timer(valid?) */
+ break;
+ case IFS_DELAY:
+ interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
+ ifinfo->timer.tv_sec = interval / MILLION;
+ ifinfo->timer.tv_usec = interval % MILLION;
+ break;
+ case IFS_PROBE:
+ ifinfo->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
+ break;
+ default:
+ warnmsg(LOG_ERR, __FUNCTION__,
+ "illegal interface state(%d) on %s",
+ ifinfo->state, ifinfo->ifname);
+ return;
+ }
+
+ /* reset the timer */
+ if (TIMEVAL_EQ(ifinfo->timer, tm_max)) {
+ ifinfo->expire = tm_max;
+ warnmsg(LOG_DEBUG, __FUNCTION__,
+ "stop timer for %s", ifinfo->ifname);
+ }
+ else {
+ gettimeofday(&now, NULL);
+ TIMEVAL_ADD(&now, &ifinfo->timer, &ifinfo->expire);
+
+ if (dflag > 1)
+ warnmsg(LOG_DEBUG, __FUNCTION__,
+ "set timer for %s to %d:%d", ifinfo->ifname,
+ (int)ifinfo->timer.tv_sec,
+ (int)ifinfo->timer.tv_usec);
+ }
+
+#undef MILLION
+}
+
+/* timer related utility functions */
+#define MILLION 1000000
+
+/* result = a + b */
+static void
+TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
+{
+ long l;
+
+ if ((l = a->tv_usec + b->tv_usec) < MILLION) {
+ result->tv_usec = l;
+ result->tv_sec = a->tv_sec + b->tv_sec;
+ }
+ else {
+ result->tv_usec = l - MILLION;
+ result->tv_sec = a->tv_sec + b->tv_sec + 1;
+ }
+}
+
+/*
+ * result = a - b
+ * XXX: this function assumes that a >= b.
+ */
+void
+TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
+{
+ long l;
+
+ if ((l = a->tv_usec - b->tv_usec) >= 0) {
+ result->tv_usec = l;
+ result->tv_sec = a->tv_sec - b->tv_sec;
+ }
+ else {
+ result->tv_usec = MILLION + l;
+ result->tv_sec = a->tv_sec - b->tv_sec - 1;
+ }
+}
+
+static void
+rtsold_set_dump_file()
+{
+ do_dump = 1;
+}
+
+static void
+usage(char *progname)
+{
+ if (progname && progname[strlen(progname) - 1] != 'd')
+ fprintf(stderr, "usage: rtsol [-dD] interfaces\n");
+ else
+ fprintf(stderr, "usage: rtsold [-dDfm1] interfaces\n");
+ exit(1);
+}
+
+void
+#if __STDC__
+warnmsg(int priority, const char *func, const char *msg, ...)
+#else
+warnmsg(priority, func, msg, va_alist)
+ int priority;
+ const char *func;
+ const char *msg;
+ va_dcl
+#endif
+{
+ va_list ap;
+ char buf[BUFSIZ];
+
+ va_start(ap, msg);
+ if (fflag) {
+ if (priority <= log_upto) {
+ (void)vfprintf(stderr, msg, ap);
+ (void)fprintf(stderr, "\n");
+ }
+ } else {
+ snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
+ vsyslog(priority, buf, ap);
+ }
+ va_end(ap);
+}
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