1 /* $KAME: faithd.c,v 1.46 2002/01/24 16:40:42 sumikawa Exp $ */
4 * Copyright (C) 1997 and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $FreeBSD: src/usr.sbin/faithd/faithd.c,v 1.2.2.7 2002/04/28 08:01:39 ume Exp $
32 * $DragonFly: src/usr.sbin/faithd/faithd.c,v 1.5 2004/02/10 02:59:41 rob Exp $
36 * User level translator from IPv6 to IPv4.
38 * Usage: faithd [<port> <progpath> <arg1(progname)> <arg2> ...]
39 * e.g. faithd telnet /usr/libexec/telnetd telnetd
42 #include <sys/param.h>
43 #include <sys/types.h>
44 #include <sys/sysctl.h>
45 #include <sys/socket.h>
49 #include <sys/ioctl.h>
65 #include <net/if_types.h>
69 # include <net/route.h>
70 # include <net/if_dl.h>
73 #include <netinet/in.h>
74 #include <arpa/inet.h>
80 #include <arpa/nameser.h>
82 #define FAITH_NS "FAITH_NS"
89 char *serverpath = NULL;
90 char *serverarg[MAXARGV + 1];
91 static char *faithdname = NULL;
93 char procname[BUFSIZ];
96 struct sockaddr *addr;
98 struct myaddrs *myaddrs = NULL;
99 static const char *service;
101 static int sockfd = 0;
104 static int pflag = 0;
105 static int inetd = 0;
106 static char *configfile = NULL;
108 int main(int, char **);
109 static int inetd_main(int, char **);
110 static int daemon_main(int, char **);
111 static void play_service(int);
112 static void play_child(int, struct sockaddr *);
113 static int faith_prefix(struct sockaddr *);
114 static int map6to4(struct sockaddr_in6 *, struct sockaddr_in *);
116 static int map4to6(struct sockaddr_in *, struct sockaddr_in6 *);
118 static void sig_child(int);
119 static void sig_terminate(int);
120 static void start_daemon(void);
121 static void exit_stderr(const char *, ...)
122 __attribute__((__format__(__printf__, 1, 2)));
123 static void grab_myaddrs(void);
124 static void free_myaddrs(void);
125 static void update_myaddrs(void);
126 static void usage(void);
129 main(int argc, char **argv)
136 faithdname = strrchr(argv[0], '/');
140 faithdname = argv[0];
142 if (strcmp(faithdname, "faithd") != 0) {
144 return inetd_main(argc, argv);
146 return daemon_main(argc, argv);
150 inetd_main(int argc, char **argv)
152 char path[MAXPATHLEN];
153 struct sockaddr_storage me;
154 struct sockaddr_storage from;
159 char sbuf[NI_MAXSERV], snum[NI_MAXSERV];
161 if (config_load(configfile) < 0 && configfile) {
162 exit_failure("could not load config file");
166 if (strrchr(argv[0], '/') == NULL)
167 snprintf(path, sizeof(path), "%s/%s", DEFAULT_DIR, argv[0]);
169 snprintf(path, sizeof(path), "%s", argv[0]);
174 sockfd = socket(PF_ROUTE, SOCK_RAW, PF_UNSPEC);
176 exit_failure("socket(PF_ROUTE): %s", strerror(errno));
182 if (getsockname(STDIN_FILENO, (struct sockaddr *)&me, &melen) < 0) {
183 exit_failure("getsockname: %s", strerror(errno));
186 fromlen = sizeof(from);
187 if (getpeername(STDIN_FILENO, (struct sockaddr *)&from, &fromlen) < 0) {
188 exit_failure("getpeername: %s", strerror(errno));
191 if (getnameinfo((struct sockaddr *)&me, melen, NULL, 0,
192 sbuf, sizeof(sbuf), NI_NUMERICHOST) == 0)
195 service = DEFAULT_PORT_NAME;
196 if (getnameinfo((struct sockaddr *)&me, melen, NULL, 0,
197 snum, sizeof(snum), NI_NUMERICHOST) != 0)
198 snprintf(snum, sizeof(snum), "?");
200 snprintf(logname, sizeof(logname), "faithd %s", snum);
201 snprintf(procname, sizeof(procname), "accepting port %s", snum);
202 openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
204 if (argc >= MAXARGV) {
205 exit_failure("too many arguments");
208 serverarg[0] = serverpath = path;
209 for (i = 1; i < argc; i++)
210 serverarg[i] = argv[i];
213 error = setsockopt(STDIN_FILENO, SOL_SOCKET, SO_OOBINLINE, &on,
216 exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno));
220 play_child(STDIN_FILENO, (struct sockaddr *)&from);
221 exit_failure("should not reach here");
226 daemon_main(int argc, char **argv)
228 struct addrinfo hints, *res;
229 int s_wld, error, i, serverargc, on = 1;
230 int family = AF_INET6;
234 #endif /* FAITH_NS */
236 while ((c = getopt(argc, argv, "df:p46")) != -1) {
263 if (config_load(configfile) < 0 && configfile) {
264 exit_failure("could not load config file");
269 if ((ns = getenv(FAITH_NS)) != NULL) {
270 struct sockaddr_storage ss;
271 struct addrinfo hints, *res;
272 char serv[NI_MAXSERV];
274 memset(&ss, 0, sizeof(ss));
275 memset(&hints, 0, sizeof(hints));
276 snprintf(serv, sizeof(serv), "%u", NAMESERVER_PORT);
277 hints.ai_flags = AI_NUMERICHOST;
278 if (getaddrinfo(ns, serv, &hints, &res) == 0) {
280 memcpy(&_res_ext.nsaddr, res->ai_addr, res->ai_addrlen);
284 #endif /* FAITH_NS */
295 serverargc = argc - NUMARG;
296 if (serverargc >= MAXARGV)
297 exit_stderr("too many arguments");
299 serverpath = malloc(strlen(argv[NUMPRG]) + 1);
300 strcpy(serverpath, argv[NUMPRG]);
301 for (i = 0; i < serverargc; i++) {
302 serverarg[i] = malloc(strlen(argv[i + NUMARG]) + 1);
303 strcpy(serverarg[i], argv[i + NUMARG]);
307 case 1: /* no local service */
308 service = argv[NUMPRT];
313 * Opening wild card socket for this service.
316 memset(&hints, 0, sizeof(hints));
317 hints.ai_flags = AI_PASSIVE;
318 hints.ai_family = family;
319 hints.ai_socktype = SOCK_STREAM;
320 hints.ai_protocol = 0;
321 error = getaddrinfo(NULL, service, &hints, &res);
323 exit_failure("getaddrinfo: %s", gai_strerror(error));
325 s_wld = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
327 exit_failure("socket: %s", strerror(errno));
330 if (res->ai_family == AF_INET6) {
331 error = setsockopt(s_wld, IPPROTO_IPV6, IPV6_FAITH, &on, sizeof(on));
333 exit_failure("setsockopt(IPV6_FAITH): %s",
339 if (res->ai_family == AF_INET) {
340 error = setsockopt(s_wld, IPPROTO_IP, IP_FAITH, &on, sizeof(on));
342 exit_failure("setsockopt(IP_FAITH): %s",
348 error = setsockopt(s_wld, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
350 exit_failure("setsockopt(SO_REUSEADDR): %s", strerror(errno));
352 error = setsockopt(s_wld, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on));
354 exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno));
356 error = bind(s_wld, (struct sockaddr *)res->ai_addr, res->ai_addrlen);
358 exit_failure("bind: %s", strerror(errno));
360 error = listen(s_wld, 5);
362 exit_failure("listen: %s", strerror(errno));
365 sockfd = socket(PF_ROUTE, SOCK_RAW, PF_UNSPEC);
367 exit_failure("socket(PF_ROUTE): %s", strerror(errno));
378 snprintf(logname, sizeof(logname), "faithd %s", service);
379 snprintf(procname, sizeof(procname), "accepting port %s", service);
380 openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
381 syslog(LOG_INFO, "Staring faith daemon for %s port", service);
385 exit(1); /*pacify gcc*/
389 play_service(int s_wld)
391 struct sockaddr_storage srcaddr;
400 * Wait, accept, fork, faith....
403 setproctitle("%s", procname);
406 FD_SET(s_wld, &rfds);
410 FD_SET(sockfd, &rfds);
411 maxfd = (maxfd < sockfd) ? sockfd : maxfd;
415 error = select(maxfd + 1, &rfds, NULL, NULL, NULL);
419 exit_failure("select: %s", strerror(errno));
424 if (FD_ISSET(sockfd, &rfds)) {
428 if (FD_ISSET(s_wld, &rfds)) {
429 len = sizeof(srcaddr);
430 s_src = accept(s_wld, (struct sockaddr *)&srcaddr,
433 if (errno == ECONNABORTED)
435 exit_failure("socket: %s", strerror(errno));
441 if (child_pid == 0) {
445 openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
446 play_child(s_src, (struct sockaddr *)&srcaddr);
447 exit_failure("should never reach here");
453 syslog(LOG_ERR, "can't fork");
460 play_child(int s_src, struct sockaddr *srcaddr)
462 struct sockaddr_storage dstaddr6;
463 struct sockaddr_storage dstaddr4;
464 char src[NI_MAXHOST];
465 char dst6[NI_MAXHOST];
466 char dst4[NI_MAXHOST];
467 int len = sizeof(dstaddr6);
468 int s_dst, error, hport, nresvport, on = 1;
470 struct sockaddr *sa4;
471 const struct config *conf;
476 getnameinfo(srcaddr, srcaddr->sa_len,
477 src, sizeof(src), NULL, 0, NI_NUMERICHOST);
478 syslog(LOG_INFO, "accepted a client from %s", src);
480 error = getsockname(s_src, (struct sockaddr *)&dstaddr6, &len);
482 exit_failure("getsockname: %s", strerror(errno));
486 getnameinfo((struct sockaddr *)&dstaddr6, len,
487 dst6, sizeof(dst6), NULL, 0, NI_NUMERICHOST);
488 syslog(LOG_INFO, "the client is connecting to %s", dst6);
490 if (!faith_prefix((struct sockaddr *)&dstaddr6)) {
495 syslog(LOG_INFO, "executing local %s", serverpath);
502 execv(serverpath, serverarg);
503 syslog(LOG_ERR, "execv %s: %s", serverpath,
508 exit_success("no local service for %s", service);
513 * Act as a translator
516 switch (((struct sockaddr *)&dstaddr6)->sa_family) {
518 if (!map6to4((struct sockaddr_in6 *)&dstaddr6,
519 (struct sockaddr_in *)&dstaddr4)) {
521 exit_failure("map6to4 failed");
524 syslog(LOG_INFO, "translating from v6 to v4");
528 if (!map4to6((struct sockaddr_in *)&dstaddr6,
529 (struct sockaddr_in6 *)&dstaddr4)) {
531 exit_failure("map4to6 failed");
534 syslog(LOG_INFO, "translating from v4 to v6");
539 exit_failure("family not supported");
543 sa4 = (struct sockaddr *)&dstaddr4;
544 getnameinfo(sa4, sa4->sa_len,
545 dst4, sizeof(dst4), NULL, 0, NI_NUMERICHOST);
547 conf = config_match(srcaddr, sa4);
548 if (!conf || !conf->permit) {
551 exit_failure("translation to %s not permitted for %s",
552 dst4, prefix_string(&conf->match));
555 exit_failure("translation to %s not permitted", dst4);
560 syslog(LOG_INFO, "the translator is connecting to %s", dst4);
562 setproctitle("port %s, %s -> %s", service, src, dst4);
564 if (sa4->sa_family == AF_INET6)
565 hport = ntohs(((struct sockaddr_in6 *)&dstaddr4)->sin6_port);
567 hport = ntohs(((struct sockaddr_in *)&dstaddr4)->sin_port);
572 s_dst = rresvport_af(&nresvport, sa4->sa_family);
576 s_dst = rresvport_af(&nresvport, sa4->sa_family);
578 s_dst = socket(sa4->sa_family, SOCK_STREAM, 0);
582 exit_failure("socket: %s", strerror(errno));
586 if (conf->src.a.ss_family) {
587 if (bind(s_dst, (const struct sockaddr *)&conf->src.a,
588 conf->src.a.ss_len) < 0) {
589 exit_failure("bind: %s", strerror(errno));
594 error = setsockopt(s_dst, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on));
596 exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno));
600 error = setsockopt(s_src, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
602 exit_failure("setsockopt(SO_SNDTIMEO): %s", strerror(errno));
605 error = setsockopt(s_dst, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
607 exit_failure("setsockopt(SO_SNDTIMEO): %s", strerror(errno));
611 error = connect(s_dst, sa4, sa4->sa_len);
613 exit_failure("connect: %s", strerror(errno));
619 ftp_relay(s_src, s_dst);
623 "WARINNG: it is insecure to relay rsh port");
624 rsh_relay(s_src, s_dst);
628 "WARINNG: it is insecure to relay rlogin port");
631 tcp_relay(s_src, s_dst, service);
638 /* 0: non faith, 1: faith */
640 faith_prefix(struct sockaddr *dst)
644 struct in6_addr faith_prefix;
645 struct sockaddr_in6 *dst6 = (struct sockaddr_in *)dst;
647 if (dst->sa_family != AF_INET6)
652 mib[2] = IPPROTO_IPV6;
653 mib[3] = IPV6CTL_FAITH_PREFIX;
654 size = sizeof(struct in6_addr);
655 if (sysctl(mib, 4, &faith_prefix, &size, NULL, 0) < 0) {
656 exit_failure("sysctl: %s", strerror(errno));
660 if (memcmp(dst, &faith_prefix,
661 sizeof(struct in6_addr) - sizeof(struct in_addr) == 0) {
667 struct sockaddr_in6 *sin6;
668 struct sockaddr_in *sin4;
669 struct sockaddr_in6 *dst6;
670 struct sockaddr_in *dst4;
671 struct sockaddr_in dstmap;
673 dst6 = (struct sockaddr_in6 *)dst;
674 if (dst->sa_family == AF_INET6
675 && IN6_IS_ADDR_V4MAPPED(&dst6->sin6_addr)) {
677 memset(&dstmap, 0, sizeof(dstmap));
678 dstmap.sin_family = AF_INET;
679 dstmap.sin_len = sizeof(dstmap);
680 memcpy(&dstmap.sin_addr, &dst6->sin6_addr.s6_addr[12],
681 sizeof(dstmap.sin_addr));
682 dst = (struct sockaddr *)&dstmap;
685 dst6 = (struct sockaddr_in6 *)dst;
686 dst4 = (struct sockaddr_in *)dst;
688 for (p = myaddrs; p; p = p->next) {
689 sin6 = (struct sockaddr_in6 *)p->addr;
690 sin4 = (struct sockaddr_in *)p->addr;
692 if (p->addr->sa_len != dst->sa_len
693 || p->addr->sa_family != dst->sa_family)
696 switch (dst->sa_family) {
698 if (sin6->sin6_scope_id == dst6->sin6_scope_id
699 && IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &dst6->sin6_addr))
703 if (sin4->sin_addr.s_addr == dst4->sin_addr.s_addr)
712 /* 0: non faith, 1: faith */
714 map6to4(struct sockaddr_in6 *dst6, struct sockaddr_in *dst4)
716 memset(dst4, 0, sizeof(*dst4));
717 dst4->sin_len = sizeof(*dst4);
718 dst4->sin_family = AF_INET;
719 dst4->sin_port = dst6->sin6_port;
720 memcpy(&dst4->sin_addr, &dst6->sin6_addr.s6_addr[12],
721 sizeof(dst4->sin_addr));
723 if (dst4->sin_addr.s_addr == INADDR_ANY
724 || dst4->sin_addr.s_addr == INADDR_BROADCAST
725 || IN_MULTICAST(ntohl(dst4->sin_addr.s_addr)))
732 /* 0: non faith, 1: faith */
734 map4to6(struct sockaddr_in *dst4, struct sockaddr_in6 *dst6)
736 char host[NI_MAXHOST];
737 char serv[NI_MAXSERV];
738 struct addrinfo hints, *res;
741 if (getnameinfo((struct sockaddr *)dst4, dst4->sin_len, host, sizeof(host),
742 serv, sizeof(serv), NI_NAMEREQD|NI_NUMERICSERV) != 0)
745 memset(&hints, 0, sizeof(hints));
747 hints.ai_family = AF_INET6;
748 hints.ai_socktype = SOCK_STREAM;
749 hints.ai_protocol = 0;
751 if ((ai_errno = getaddrinfo(host, serv, &hints, &res)) != 0) {
752 syslog(LOG_INFO, "%s %s: %s", host, serv,
753 gai_strerror(ai_errno));
757 memcpy(dst6, res->ai_addr, res->ai_addrlen);
771 pid = wait3(&status, WNOHANG, (struct rusage *)0);
772 if (pid && WEXITSTATUS(status))
773 syslog(LOG_WARNING, "child %d exit status 0x%x", pid, status);
777 sig_terminate(int sig)
779 syslog(LOG_INFO, "Terminating faith daemon");
790 if (daemon(0, 0) == -1)
791 exit_stderr("daemon: %s", strerror(errno));
794 memset(&sa, 0, sizeof(sa));
795 sa.sa_handler = sig_child;
796 sa.sa_flags = SA_NOCLDWAIT;
797 sigemptyset(&sa.sa_mask);
798 sigaction(SIGCHLD, &sa, (struct sigaction *)0);
800 if (signal(SIGCHLD, sig_child) == SIG_ERR) {
801 exit_failure("signal CHLD: %s", strerror(errno));
806 if (signal(SIGTERM, sig_terminate) == SIG_ERR) {
807 exit_failure("signal TERM: %s", strerror(errno));
813 exit_stderr(const char *fmt, ...)
819 vsnprintf(buf, sizeof(buf), fmt, ap);
821 fprintf(stderr, "%s\n", buf);
826 exit_failure(const char *fmt, ...)
832 vsnprintf(buf, sizeof(buf), fmt, ap);
834 syslog(LOG_ERR, "%s", buf);
839 exit_success(const char *fmt, ...)
845 vsnprintf(buf, sizeof(buf), fmt, ap);
847 syslog(LOG_INFO, "%s", buf);
855 struct ifaddrs *ifap, *ifa;
857 struct sockaddr_in6 *sin6;
859 if (getifaddrs(&ifap) != 0) {
860 exit_failure("getifaddrs");
864 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
865 switch (ifa->ifa_addr->sa_family) {
873 p = (struct myaddrs *)malloc(sizeof(struct myaddrs) +
874 ifa->ifa_addr->sa_len);
876 exit_failure("not enough core");
879 memcpy(p + 1, ifa->ifa_addr, ifa->ifa_addr->sa_len);
881 p->addr = (struct sockaddr *)(p + 1);
883 if (ifa->ifa_addr->sa_family == AF_INET6) {
884 sin6 = (struct sockaddr_in6 *)p->addr;
885 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)
886 || IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
887 sin6->sin6_scope_id =
888 ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
889 sin6->sin6_addr.s6_addr[2] = 0;
890 sin6->sin6_addr.s6_addr[3] = 0;
896 char hbuf[NI_MAXHOST];
897 getnameinfo(p->addr, p->addr->sa_len,
898 hbuf, sizeof(hbuf), NULL, 0,
900 syslog(LOG_INFO, "my interface: %s %s", hbuf,
911 struct myaddrs *p, *q;
927 struct rt_msghdr *rtm;
929 len = read(sockfd, msg, sizeof(msg));
931 syslog(LOG_ERR, "read(PF_ROUTE) failed");
934 rtm = (struct rt_msghdr *)msg;
935 if (len < 4 || len < rtm->rtm_msglen) {
936 syslog(LOG_ERR, "read(PF_ROUTE) short read");
939 if (rtm->rtm_version != RTM_VERSION) {
940 syslog(LOG_ERR, "routing socket version mismatch");
945 switch (rtm->rtm_type) {
953 /* XXX more filters here? */
955 syslog(LOG_INFO, "update interface address list");
964 fprintf(stderr, "usage: %s [-dp] [-f conf] service [serverpath [serverargs]]\n",