1 /* $NetBSD: rpcbind.c,v 1.5 2015/08/21 14:19:10 christos Exp $ */
2
3 /*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California 94043
30 */
31 /*
32 * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
33 */
34
35 /* #ident "@(#)rpcbind.c 1.19 94/04/25 SMI" */
36
37 #if 0
38 #ifndef lint
39 static char sccsid[] = "@(#)rpcbind.c 1.35 89/04/21 Copyr 1984 Sun Micro";
40 #endif
41 #endif
42
43 /*
44 * rpcbind.c
45 * Implements the program, version to address mapping for rpc.
46 *
47 */
48
49 #include <sys/types.h>
50 #include <sys/stat.h>
51 #include <sys/errno.h>
52 #include <sys/time.h>
53 #include <sys/resource.h>
54 #include <sys/wait.h>
55 #include <sys/signal.h>
56 #include <sys/socket.h>
57 #include <sys/un.h>
58 #include <rpc/rpc.h>
59 #ifdef PORTMAP
60 #include <netinet/in.h>
61 #endif
62 #include <netdb.h>
63 #include <stdio.h>
64 #include <netconfig.h>
65 #include <stdlib.h>
66 #include <unistd.h>
67 #include <syslog.h>
68 #include <err.h>
69 #include <util.h>
70 #include <pwd.h>
71 #include <semaphore.h>
72 #include <string.h>
73 #include <errno.h>
74 #include "rpcbind.h"
75
76 #include <rump/rump.h>
77 #include <rump/rump_syscalls.h>
78
79 /* Global variables */
80 int debugging = 1; /* Tell me what's going on */
81 int doabort = 0; /* When debugging, do an abort on errors */
82 rpcblist_ptr list_rbl; /* A list of version 3/4 rpcbind services */
83
84 #include "svc_fdset.h"
85
86 /* who to suid to if -s is given */
87 #define RUN_AS "daemon"
88
89 int runasdaemon = 0;
90 int insecure = 0;
91 int oldstyle_local = 0;
92 int verboselog = 0;
93
94 #ifdef WARMSTART
95 /* Local Variable */
96 static int warmstart = 0; /* Grab a old copy of registrations */
97 #endif
98
99 #ifdef PORTMAP
100 struct pmaplist *list_pml; /* A list of version 2 rpcbind services */
101 const char *udptrans; /* Name of UDP transport */
102 const char *tcptrans; /* Name of TCP transport */
103 const char *udp_uaddr; /* Universal UDP address */
104 const char *tcp_uaddr; /* Universal TCP address */
105 #endif
106 static const char servname[] = "sunrpc";
107
108 const char rpcbind_superuser[] = "superuser";
109 const char rpcbind_unknown[] = "unknown";
110
111 static int init_transport(struct netconfig *);
112 static void rbllist_add(rpcprog_t, rpcvers_t, struct netconfig *,
113 struct netbuf *);
114 static void terminate(int);
115 #if 0
116 static void parseargs(int, char *[]);
117 #endif
118
119 int rpcbind_main(void *);
120 int
rpcbind_main(void * arg)121 rpcbind_main(void *arg)
122 {
123 struct netconfig *nconf;
124 void *nc_handle; /* Net config handle */
125 struct rlimit rl;
126 int maxrec = RPC_MAXDATASIZE;
127 extern sem_t gensem;
128
129 #if 0
130 parseargs(argc, argv);
131 #endif
132
133 alloc_fdset();
134
135 getrlimit(RLIMIT_NOFILE, &rl);
136 if (rl.rlim_cur < 128) {
137 if (rl.rlim_max <= 128)
138 rl.rlim_cur = rl.rlim_max;
139 else
140 rl.rlim_cur = 128;
141 setrlimit(RLIMIT_NOFILE, &rl);
142 }
143 #if 0
144 if (geteuid()) /* This command allowed only to root */
145 errx(1, "Sorry. You are not superuser");
146 #endif
147 nc_handle = setnetconfig(); /* open netconfig file */
148 if (nc_handle == NULL)
149 errx(1, "could not read /etc/netconfig");
150 #ifdef PORTMAP
151 udptrans = "";
152 tcptrans = "";
153 #endif
154
155 nconf = getnetconfigent("local");
156 if (nconf == NULL)
157 errx(1, "can't find local transport");
158
159 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
160
161 init_transport(nconf);
162
163 while ((nconf = getnetconfig(nc_handle))) {
164 if (nconf->nc_flag & NC_VISIBLE)
165 init_transport(nconf);
166 }
167 endnetconfig(nc_handle);
168
169 /* catch the usual termination signals for graceful exit */
170 (void) signal(SIGCHLD, reap);
171 (void) signal(SIGINT, terminate);
172 (void) signal(SIGTERM, terminate);
173 (void) signal(SIGQUIT, terminate);
174 /* ignore others that could get sent */
175 (void) signal(SIGPIPE, SIG_IGN);
176 //(void) signal(SIGHUP, SIG_IGN); used by mountd
177 (void) signal(SIGUSR1, SIG_IGN);
178 (void) signal(SIGUSR2, SIG_IGN);
179 #ifdef WARMSTART
180 if (warmstart) {
181 read_warmstart();
182 }
183 #endif
184 if (debugging) {
185 printf("rpcbind debugging enabled.");
186 if (doabort) {
187 printf(" Will abort on errors!\n");
188 } else {
189 printf("\n");
190 }
191 } else {
192 if (daemon(0, 0))
193 err(1, "fork failed");
194 }
195
196 openlog("rpcbind", 0, LOG_DAEMON);
197 pidfile(NULL);
198
199 if (runasdaemon) {
200 struct passwd *p;
201
202 if ((p = getpwnam(RUN_AS)) == NULL) {
203 syslog(LOG_ERR, "cannot get uid of daemon (%s)",
204 strerror(errno));
205 exit(1);
206 }
207 if (setuid(p->pw_uid) == -1) {
208 syslog(LOG_ERR, "setuid to daemon failed: (%s)",
209 strerror(errno));
210 exit(1);
211 }
212 }
213
214 network_init();
215
216 sem_post(&gensem);
217 my_svc_run();
218 syslog(LOG_ERR, "svc_run returned unexpectedly");
219 rpcbind_abort();
220 /* NOTREACHED */
221
222 return 0;
223 }
224
225 /*
226 * Adds the entry into the rpcbind database.
227 * If PORTMAP, then for UDP and TCP, it adds the entries for version 2 also
228 * Returns 0 if succeeds, else fails
229 */
230 static int
init_transport(struct netconfig * nconf)231 init_transport(struct netconfig *nconf)
232 {
233 int fd;
234 struct t_bind taddr;
235 struct addrinfo hints, *res = NULL;
236 struct __rpc_sockinfo si;
237 SVCXPRT *my_xprt;
238 int aicode, status, addrlen;
239 struct sockaddr *sa;
240 struct sockaddr_un sun;
241 const int one = 1;
242
243 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
244 (nconf->nc_semantics != NC_TPI_COTS) &&
245 (nconf->nc_semantics != NC_TPI_COTS_ORD))
246 return 1; /* not my type */
247 #ifdef RPCBIND_DEBUG
248 if (debugging) {
249 int i;
250 char **s;
251
252 (void)fprintf(stderr, "%s: %ld lookup routines :\n",
253 nconf->nc_netid, nconf->nc_nlookups);
254 for (i = 0, s = nconf->nc_lookups; i < nconf->nc_nlookups;
255 i++, s++)
256 (void)fprintf(stderr, "[%d] - %s\n", i, *s);
257 }
258 #endif
259
260 /*
261 * XXX - using RPC library internal functions.
262 */
263 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
264 if (errno == EAFNOSUPPORT)
265 return 1;
266 warn("Cannot create socket for `%s'", nconf->nc_netid);
267 return 1;
268 }
269
270 if (!__rpc_nconf2sockinfo(nconf, &si)) {
271 warnx("Cannot get information for `%s'", nconf->nc_netid);
272 return 1;
273 }
274
275 if (si.si_af == AF_INET6) {
276 /*
277 * We're doing host-based access checks here, so don't allow
278 * v4-in-v6 to confuse things.
279 */
280 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
281 sizeof one) < 0) {
282 warn("Can't make socket ipv6 only");
283 return 1;
284 }
285 }
286
287
288 if (!strcmp(nconf->nc_netid, "local")) {
289 (void)memset(&sun, 0, sizeof sun);
290 sun.sun_family = AF_LOCAL;
291 (void)rump_sys_unlink(_PATH_RPCBINDSOCK);
292 (void)strlcpy(sun.sun_path, _PATH_RPCBINDSOCK,
293 sizeof(sun.sun_path));
294 sun.sun_len = SUN_LEN(&sun);
295 addrlen = sizeof(struct sockaddr_un);
296 sa = (struct sockaddr *)&sun;
297 } else {
298 /* Get rpcbind's address on this transport */
299
300 (void)memset(&hints, 0, sizeof hints);
301 hints.ai_flags = AI_PASSIVE;
302 hints.ai_family = si.si_af;
303 hints.ai_socktype = si.si_socktype;
304 hints.ai_protocol = si.si_proto;
305 if ((aicode = getaddrinfo(NULL, servname, &hints, &res)) != 0) {
306 warnx("Cannot get local address for `%s' (%s)",
307 nconf->nc_netid, gai_strerror(aicode));
308 return 1;
309 }
310 addrlen = res->ai_addrlen;
311 sa = (struct sockaddr *)res->ai_addr;
312 }
313
314 if (bind(fd, sa, addrlen) < 0) {
315 warn("Cannot bind `%s'", nconf->nc_netid);
316 if (res != NULL)
317 freeaddrinfo(res);
318 return 1;
319 }
320 #if 0
321 if (sa->sa_family == AF_LOCAL)
322 if (rump_sys_chmod(sun.sun_path, S_IRWXU|S_IRWXG|S_IRWXO) == -1)
323 warn("Cannot chmod `%s'", sun.sun_path);
324 #endif
325
326 /* Copy the address */
327 taddr.addr.len = taddr.addr.maxlen = addrlen;
328 taddr.addr.buf = malloc(addrlen);
329 if (taddr.addr.buf == NULL) {
330 warn("Cannot allocate memory for `%s' address",
331 nconf->nc_netid);
332 if (res != NULL)
333 freeaddrinfo(res);
334 return 1;
335 }
336 (void)memcpy(taddr.addr.buf, sa, addrlen);
337 #ifdef RPCBIND_DEBUG
338 if (debugging) {
339 /* for debugging print out our universal address */
340 char *uaddr;
341 struct netbuf nb;
342
343 nb.buf = sa;
344 nb.len = nb.maxlen = sa->sa_len;
345 uaddr = taddr2uaddr(nconf, &nb);
346 (void)fprintf(stderr, "rpcbind: my address is %s\n", uaddr);
347 (void)free(uaddr);
348 }
349 #endif
350
351 if (res != NULL)
352 freeaddrinfo(res);
353
354 if (nconf->nc_semantics != NC_TPI_CLTS)
355 listen(fd, SOMAXCONN);
356
357 my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, &taddr, RPC_MAXDATASIZE,
358 RPC_MAXDATASIZE);
359 if (my_xprt == NULL) {
360 warnx("Could not create service for `%s'", nconf->nc_netid);
361 goto error;
362 }
363
364 #ifdef PORTMAP
365 /*
366 * Register both the versions for tcp/ip, udp/ip and local.
367 */
368 if ((strcmp(nconf->nc_protofmly, NC_INET) == 0 &&
369 (strcmp(nconf->nc_proto, NC_TCP) == 0 ||
370 strcmp(nconf->nc_proto, NC_UDP) == 0)) ||
371 strcmp(nconf->nc_netid, "local") == 0) {
372 struct pmaplist *pml;
373
374 if (!svc_register(my_xprt, PMAPPROG, PMAPVERS,
375 pmap_service, 0)) {
376 warn("Could not register on `%s'", nconf->nc_netid);
377 goto error;
378 }
379 pml = malloc(sizeof (struct pmaplist));
380 if (pml == NULL) {
381 warn("Cannot allocate memory");
382 goto error;
383 }
384 pml->pml_map.pm_prog = PMAPPROG;
385 pml->pml_map.pm_vers = PMAPVERS;
386 pml->pml_map.pm_port = PMAPPORT;
387 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
388 if (tcptrans[0]) {
389 warnx(
390 "Cannot have more than one TCP transport");
391 free(pml);
392 goto error;
393 }
394 tcptrans = strdup(nconf->nc_netid);
395 if (tcptrans == NULL) {
396 free(pml);
397 warn("Cannot allocate memory");
398 goto error;
399 }
400 pml->pml_map.pm_prot = IPPROTO_TCP;
401
402 /* Let's snarf the universal address */
403 /* "h1.h2.h3.h4.p1.p2" */
404 tcp_uaddr = taddr2uaddr(nconf, &taddr.addr);
405 } else if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
406 if (udptrans[0]) {
407 free(pml);
408 warnx(
409 "Cannot have more than one UDP transport");
410 goto error;
411 }
412 udptrans = strdup(nconf->nc_netid);
413 if (udptrans == NULL) {
414 free(pml);
415 warn("Cannot allocate memory");
416 goto error;
417 }
418 pml->pml_map.pm_prot = IPPROTO_UDP;
419
420 /* Let's snarf the universal address */
421 /* "h1.h2.h3.h4.p1.p2" */
422 udp_uaddr = taddr2uaddr(nconf, &taddr.addr);
423 }
424 pml->pml_next = list_pml;
425 list_pml = pml;
426
427 /* Add version 3 information */
428 pml = malloc(sizeof (struct pmaplist));
429 if (pml == NULL) {
430 warn("Cannot allocate memory");
431 goto error;
432 }
433 pml->pml_map = list_pml->pml_map;
434 pml->pml_map.pm_vers = RPCBVERS;
435 pml->pml_next = list_pml;
436 list_pml = pml;
437
438 /* Add version 4 information */
439 pml = malloc(sizeof (struct pmaplist));
440 if (pml == NULL) {
441 warn("Cannot allocate memory");
442 goto error;
443 }
444 pml->pml_map = list_pml->pml_map;
445 pml->pml_map.pm_vers = RPCBVERS4;
446 pml->pml_next = list_pml;
447 list_pml = pml;
448
449 /* Also add version 2 stuff to rpcbind list */
450 rbllist_add(PMAPPROG, PMAPVERS, nconf, &taddr.addr);
451 }
452 #endif
453
454 /* version 3 registration */
455 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) {
456 warn("Could not register %s version 3", nconf->nc_netid);
457 goto error;
458 }
459 rbllist_add(RPCBPROG, RPCBVERS, nconf, &taddr.addr);
460
461 /* version 4 registration */
462 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) {
463 warn("Could not register %s version 4", nconf->nc_netid);
464 goto error;
465 }
466 rbllist_add(RPCBPROG, RPCBVERS4, nconf, &taddr.addr);
467
468 /* decide if bound checking works for this transport */
469 status = add_bndlist(nconf, &taddr.addr);
470 #ifdef RPCBIND_DEBUG
471 if (debugging) {
472 if (status < 0) {
473 fprintf(stderr, "Error in finding bind status for %s\n",
474 nconf->nc_netid);
475 } else if (status == 0) {
476 fprintf(stderr, "check binding for %s\n",
477 nconf->nc_netid);
478 } else if (status > 0) {
479 fprintf(stderr, "No check binding for %s\n",
480 nconf->nc_netid);
481 }
482 }
483 #else
484 __USE(status);
485 #endif
486 /*
487 * rmtcall only supported on CLTS transports for now.
488 */
489 if (nconf->nc_semantics == NC_TPI_CLTS) {
490 status = create_rmtcall_fd(nconf);
491
492 #ifdef RPCBIND_DEBUG
493 if (debugging) {
494 if (status < 0) {
495 fprintf(stderr,
496 "Could not create rmtcall fd for %s\n",
497 nconf->nc_netid);
498 } else {
499 fprintf(stderr, "rmtcall fd for %s is %d\n",
500 nconf->nc_netid, status);
501 }
502 }
503 #endif
504 }
505 return (0);
506 error:
507 (void)rump_sys_close(fd);
508 return (1);
509 }
510
511 static void
rbllist_add(rpcprog_t prog,rpcvers_t vers,struct netconfig * nconf,struct netbuf * addr)512 rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf,
513 struct netbuf *addr)
514 {
515 rpcblist_ptr rbl;
516
517 rbl = malloc(sizeof(rpcblist));
518 if (rbl == NULL) {
519 warn("Out of memory");
520 return;
521 }
522
523 rbl->rpcb_map.r_prog = prog;
524 rbl->rpcb_map.r_vers = vers;
525 rbl->rpcb_map.r_netid = strdup(nconf->nc_netid);
526 rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr);
527 rbl->rpcb_map.r_owner = strdup(rpcbind_superuser);
528 rbl->rpcb_next = list_rbl; /* Attach to global list */
529 list_rbl = rbl;
530 }
531
532 /*
533 * Catch the signal and die
534 */
535 static void
terminate(int dummy)536 terminate(int dummy)
537 {
538 #ifdef WARMSTART
539 syslog(LOG_ERR,
540 "rpcbind terminating on signal. Restart with \"rpcbind -w\"");
541 write_warmstart(); /* Dump yourself */
542 #endif
543 exit(2);
544 }
545
546 void
rpcbind_abort()547 rpcbind_abort()
548 {
549 #ifdef WARMSTART
550 write_warmstart(); /* Dump yourself */
551 #endif
552 abort();
553 }
554
555 #if 0
556 /* get command line options */
557 static void
558 parseargs(int argc, char *argv[])
559 {
560 int c;
561
562 while ((c = getopt(argc, argv, "dwailLs")) != -1) {
563 switch (c) {
564 case 'a':
565 doabort = 1; /* when debugging, do an abort on */
566 break; /* errors; for rpcbind developers */
567 /* only! */
568 case 'd':
569 debugging = 1;
570 break;
571 case 'i':
572 insecure = 1;
573 break;
574 case 'L':
575 oldstyle_local = 1;
576 break;
577 case 'l':
578 verboselog = 1;
579 break;
580 case 's':
581 runasdaemon = 1;
582 break;
583 #ifdef WARMSTART
584 case 'w':
585 warmstart = 1;
586 break;
587 #endif
588 default: /* error */
589 fprintf(stderr, "usage: rpcbind [-Idwils]\n");
590 exit (1);
591 }
592 }
593 if (doabort && !debugging) {
594 fprintf(stderr,
595 "-a (abort) specified without -d (debugging) -- ignored.\n");
596 doabort = 0;
597 }
598 }
599 #endif
600
601 void
reap(int dummy)602 reap(int dummy)
603 {
604 int save_errno = errno;
605
606 while (wait3(NULL, WNOHANG, NULL) > 0)
607 ;
608 errno = save_errno;
609 }
610
611 void
toggle_verboselog(int dummy)612 toggle_verboselog(int dummy)
613 {
614 verboselog = !verboselog;
615 }
616