2 * Copyright (c) 1992/3 Theo de Raadt <deraadt@fsa.ca>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote
14 * products derived from this software without specific prior written
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
18 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $FreeBSD: src/usr.sbin/ypbind/ypbind.c,v 1.40 2004/10/17 19:33:33 stefanf Exp $
30 * $DragonFly: src/usr.sbin/ypbind/ypbind.c,v 1.6 2005/11/24 22:23:02 swildner Exp $
33 #include <sys/param.h>
34 #include <sys/types.h>
36 #include <sys/ioctl.h>
37 #include <sys/signal.h>
38 #include <sys/socket.h>
40 #include <sys/fcntl.h>
57 #include <netinet/in.h>
58 #include <arpa/inet.h>
59 #include <rpc/pmap_clnt.h>
60 #include <rpc/pmap_prot.h>
61 #include <rpc/pmap_rmt.h>
62 #include <rpc/rpc_com.h>
63 #include <rpcsvc/yp.h>
64 #include <rpcsvc/ypclnt.h>
68 #define BINDINGDIR "/var/yp/binding"
72 #define YPBINDLOCK "/var/run/ypbind.lock"
76 struct _dom_binding *dom_pnext;
77 char dom_domain[YPMAXDOMAIN + 1];
78 struct sockaddr_in dom_server_addr;
82 int dom_broadcast_pid;
87 #define READFD ypdb->dom_pipe_fds[0]
88 #define WRITEFD ypdb->dom_pipe_fds[1]
89 #define BROADFD broad_domain->dom_pipe_fds[1]
91 extern bool_t xdr_domainname(), xdr_ypbind_resp();
92 extern bool_t xdr_ypreq_key(), xdr_ypresp_val();
93 extern bool_t xdr_ypbind_setdom();
96 void *ypbindproc_null_2_yp(SVCXPRT *, void *, CLIENT *);
97 void *ypbindproc_setdom_2_yp(SVCXPRT *, struct ypbind_setdom *, CLIENT *);
98 void rpc_received(char *, struct sockaddr_in *, int);
99 void broadcast(struct _dom_binding *);
100 int ping(struct _dom_binding *);
101 int tell_parent(char *, struct sockaddr_in *);
102 void handle_children(struct _dom_binding *);
105 void yp_restricted_mode(char *);
106 int verify(struct in_addr);
109 struct _dom_binding *ypbindlist;
110 static struct _dom_binding *broad_domain;
113 #define YPSET_LOCAL 1
115 int ypsetmode = YPSET_NO;
116 int ypsecuremode = 0;
120 * Special restricted mode variables: when in restricted mode, only the
121 * specified restricted_domain will be bound, and only the servers listed
122 * in restricted_addrs will be used for binding.
124 #define RESTRICTED_SERVERS 10
125 int yp_restricted = 0;
127 struct in_addr restricted_addrs[RESTRICTED_SERVERS];
129 /* No more than MAX_CHILDREN child broadcasters at a time. */
131 #define MAX_CHILDREN 5
133 /* No more than MAX_DOMAINS simultaneous domains */
135 #define MAX_DOMAINS 200
137 /* RPC timeout value */
138 #ifndef FAIL_THRESHOLD
139 #define FAIL_THRESHOLD 20
142 /* Number of times to fish for a response froma particular set of hosts */
144 #define MAX_RETRIES 30
153 SVCXPRT *udptransp, *tcptransp;
156 ypbindproc_null_2_yp(SVCXPRT *transp, void *argp, CLIENT *clnt)
160 bzero(&res, sizeof(res));
165 ypbindproc_domain_2_yp(SVCXPRT *transp, domainname *argp, CLIENT *clnt)
167 static struct ypbind_resp res;
168 struct _dom_binding *ypdb;
169 char path[MAXPATHLEN];
171 bzero(&res, sizeof res);
172 res.ypbind_status = YPBIND_FAIL_VAL;
173 res.ypbind_resp_u.ypbind_error = YPBIND_ERR_NOSERV;
175 if (strchr(*argp, '/')) {
176 syslog(LOG_WARNING, "Domain name '%s' has embedded slash -- \
181 for (ypdb = ypbindlist; ypdb; ypdb = ypdb->dom_pnext) {
182 if (strcmp(ypdb->dom_domain, *argp) == 0)
188 syslog(LOG_NOTICE, "Running in restricted mode -- request to bind domain \"%s\" rejected.\n", *argp);
192 if (domains >= MAX_DOMAINS) {
193 syslog(LOG_WARNING, "domain limit (%d) exceeded",
195 res.ypbind_resp_u.ypbind_error = YPBIND_ERR_RESC;
198 ypdb = (struct _dom_binding *)malloc(sizeof *ypdb);
200 syslog(LOG_WARNING, "malloc: %m");
201 res.ypbind_resp_u.ypbind_error = YPBIND_ERR_RESC;
204 bzero(ypdb, sizeof *ypdb);
205 strncpy(ypdb->dom_domain, *argp, sizeof ypdb->dom_domain);
206 ypdb->dom_vers = YPVERS;
208 ypdb->dom_default = 0;
209 ypdb->dom_lockfd = -1;
210 sprintf(path, "%s/%s.%ld", BINDINGDIR,
211 ypdb->dom_domain, ypdb->dom_vers);
213 ypdb->dom_pnext = ypbindlist;
222 res.ypbind_status = YPBIND_SUCC_VAL;
223 res.ypbind_resp_u.ypbind_error = 0; /* Success */
224 *(u_int32_t *)&res.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr =
225 ypdb->dom_server_addr.sin_addr.s_addr;
226 *(u_short *)&res.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port =
227 ypdb->dom_server_addr.sin_port;
228 /*printf("domain %s at %s/%d\n", ypdb->dom_domain,
229 inet_ntoa(ypdb->dom_server_addr.sin_addr),
230 ntohs(ypdb->dom_server_addr.sin_port));*/
235 ypbindproc_setdom_2_yp(SVCXPRT *transp, ypbind_setdom *argp, CLIENT *clnt)
237 struct sockaddr_in *fromsin, bindsin;
238 static char *result = NULL;
240 if (strchr(argp->ypsetdom_domain, '/')) {
241 syslog(LOG_WARNING, "Domain name '%s' has embedded slash -- \
242 rejecting.", argp->ypsetdom_domain);
245 fromsin = svc_getcaller(transp);
249 if (fromsin->sin_addr.s_addr != htonl(INADDR_LOOPBACK)) {
250 svcerr_noprog(transp);
258 svcerr_noprog(transp);
262 if (ntohs(fromsin->sin_port) >= IPPORT_RESERVED) {
263 svcerr_noprog(transp);
267 if (argp->ypsetdom_vers != YPVERS) {
268 svcerr_noprog(transp);
272 bzero(&bindsin, sizeof bindsin);
273 bindsin.sin_family = AF_INET;
274 bindsin.sin_addr.s_addr = *(u_int32_t *)argp->ypsetdom_binding.ypbind_binding_addr;
275 bindsin.sin_port = *(u_short *)argp->ypsetdom_binding.ypbind_binding_port;
276 rpc_received(argp->ypsetdom_domain, &bindsin, 1);
278 return((void *) &result);
282 ypbindprog_2(struct svc_req *rqstp, SVCXPRT *transp)
285 domainname ypbindproc_domain_2_arg;
286 struct ypbind_setdom ypbindproc_setdom_2_arg;
288 struct authunix_parms *creds;
290 bool_t (*xdr_argument)(), (*xdr_result)();
293 switch (rqstp->rq_proc) {
294 case YPBINDPROC_NULL:
295 xdr_argument = xdr_void;
296 xdr_result = xdr_void;
297 local = (char *(*)()) ypbindproc_null_2_yp;
300 case YPBINDPROC_DOMAIN:
301 xdr_argument = xdr_domainname;
302 xdr_result = xdr_ypbind_resp;
303 local = (char *(*)()) ypbindproc_domain_2_yp;
306 case YPBINDPROC_SETDOM:
307 switch (rqstp->rq_cred.oa_flavor) {
309 creds = (struct authunix_parms *)rqstp->rq_clntcred;
310 if (creds->aup_uid != 0) {
311 svcerr_auth(transp, AUTH_BADCRED);
316 svcerr_auth(transp, AUTH_TOOWEAK);
320 xdr_argument = xdr_ypbind_setdom;
321 xdr_result = xdr_void;
322 local = (char *(*)()) ypbindproc_setdom_2_yp;
326 svcerr_noproc(transp);
329 bzero(&argument, sizeof(argument));
330 if (!svc_getargs(transp, (xdrproc_t)xdr_argument, &argument)) {
331 svcerr_decode(transp);
334 result = (*local)(transp, &argument, rqstp);
335 if (result != NULL &&
336 !svc_sendreply(transp, (xdrproc_t)xdr_result, result)) {
337 svcerr_systemerr(transp);
342 /* Jack the reaper */
348 while (wait3(&st, WNOHANG, NULL) > 0)
355 struct _dom_binding *ypdb;
356 char path[MAXPATHLEN];
358 if (ppid != getpid())
361 for (ypdb = ypbindlist; ypdb; ypdb = ypdb->dom_pnext) {
362 close(ypdb->dom_lockfd);
363 if (ypdb->dom_broadcast_pid)
364 kill(ypdb->dom_broadcast_pid, SIGINT);
365 sprintf(path, "%s/%s.%ld", BINDINGDIR,
366 ypdb->dom_domain, ypdb->dom_vers);
371 pmap_unset(YPBINDPROG, YPBINDVERS);
376 main(int argc, char **argv)
382 struct _dom_binding *ypdb, *next;
384 /* Check that another ypbind isn't already running. */
385 if ((yplockfd = (open(YPBINDLOCK, O_RDONLY|O_CREAT, 0444))) == -1)
386 err(1, "%s", YPBINDLOCK);
388 if (flock(yplockfd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK)
389 errx(1, "another ypbind is already running. Aborting");
391 /* XXX domainname will be overriden if we use restricted mode */
392 yp_get_default_domain(&domain_name);
393 if (domain_name[0] == '\0')
394 errx(1, "domainname not set. Aborting");
396 for (i = 1; i<argc; i++) {
397 if (strcmp("-ypset", argv[i]) == 0)
398 ypsetmode = YPSET_ALL;
399 else if (strcmp("-ypsetme", argv[i]) == 0)
400 ypsetmode = YPSET_LOCAL;
401 else if (strcmp("-s", argv[i]) == 0)
403 else if (strcmp("-S", argv[i]) == 0 && argc > i)
404 yp_restricted_mode(argv[++i]);
405 else if (strcmp("-m", argv[i]) == 0)
408 errx(1, "unknown option: %s", argv[i]);
411 /* blow away everything in BINDINGDIR (if it exists) */
413 if ((dird = opendir(BINDINGDIR)) != NULL) {
414 char path[MAXPATHLEN];
415 while ((dirp = readdir(dird)) != NULL)
416 if (strcmp(dirp->d_name, ".") &&
417 strcmp(dirp->d_name, "..")) {
418 sprintf(path,"%s/%s",BINDINGDIR,dirp->d_name);
429 pmap_unset(YPBINDPROG, YPBINDVERS);
431 udptransp = svcudp_create(RPC_ANYSOCK);
432 if (udptransp == NULL)
433 errx(1, "cannot create udp service");
434 if (!svc_register(udptransp, YPBINDPROG, YPBINDVERS, ypbindprog_2,
436 errx(1, "unable to register (YPBINDPROG, YPBINDVERS, udp)");
438 tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0);
439 if (tcptransp == NULL)
440 errx(1, "cannot create tcp service");
442 if (!svc_register(tcptransp, YPBINDPROG, YPBINDVERS, ypbindprog_2,
444 errx(1, "unable to register (YPBINDPROG, YPBINDVERS, tcp)");
446 /* build initial domain binding, make it "unsuccessful" */
447 ypbindlist = (struct _dom_binding *)malloc(sizeof *ypbindlist);
448 if (ypbindlist == NULL)
450 bzero(ypbindlist, sizeof *ypbindlist);
451 strncpy(ypbindlist->dom_domain, domain_name, sizeof ypbindlist->dom_domain);
452 ypbindlist->dom_vers = YPVERS;
453 ypbindlist->dom_alive = 0;
454 ypbindlist->dom_lockfd = -1;
455 ypbindlist->dom_default = 1;
458 signal(SIGCHLD, reaper);
459 signal(SIGTERM, terminate);
461 ppid = getpid(); /* Remember who we are. */
463 openlog(argv[0], LOG_PID, LOG_DAEMON);
465 /* Kick off the default domain */
466 broadcast(ypbindlist);
474 switch (select(_rpc_dtablesize(), &fdsr, NULL, NULL, &tv)) {
480 syslog(LOG_WARNING, "select: %m");
483 for (ypdb = ypbindlist; ypdb; ypdb = next) {
484 next = ypdb->dom_pnext;
485 if (READFD > 0 && FD_ISSET(READFD, &fdsr)) {
486 handle_children(ypdb);
487 if (children == (MAX_CHILDREN - 1))
491 svc_getreqset(&fdsr);
503 struct _dom_binding *ypdb;
505 for (ypdb = ypbindlist; ypdb; ypdb = ypdb->dom_pnext)
509 /* The clnt_broadcast() callback mechanism sucks. */
512 * Receive results from broadcaster. Don't worry about passing
513 * bogus info to rpc_received() -- it can handle it. Note that we
514 * must be sure to invalidate the dom_pipe_fds descriptors here:
515 * since descriptors can be re-used, we have to make sure we
516 * don't mistake one of the RPC descriptors for one of the pipes.
517 * What's weird is that forgetting to invalidate the pipe descriptors
518 * doesn't always result in an error (otherwise I would have caught
519 * the mistake much sooner), even though logically it should.
522 handle_children(struct _dom_binding *ypdb)
524 char buf[YPMAXDOMAIN + 1];
525 struct sockaddr_in addr;
527 struct _dom_binding *y, *prev = NULL;
528 char path[MAXPATHLEN];
530 if ((d = read(READFD, &buf, sizeof(buf))) <= 0)
531 syslog(LOG_WARNING, "could not read from child: %m");
533 if ((a = read(READFD, &addr, sizeof(struct sockaddr_in))) < 0)
534 syslog(LOG_WARNING, "could not read from child: %m");
537 FD_CLR(READFD, &fdsr);
538 FD_CLR(READFD, &svc_fdset);
539 READFD = WRITEFD = -1;
541 rpc_received(buf, &addr, 0);
543 for (y = ypbindlist; y; y = y->dom_pnext) {
548 switch (ypdb->dom_default) {
551 ypbindlist = y->dom_pnext;
553 prev->dom_pnext = y->dom_pnext;
554 sprintf(path, "%s/%s.%ld", BINDINGDIR,
555 ypdb->dom_domain, YPVERS);
556 close(ypdb->dom_lockfd);
562 ypdb->dom_broadcast_pid = 0;
575 * Send our dying words back to our parent before we perish.
578 tell_parent(char *dom, struct sockaddr_in *addr)
580 char buf[YPMAXDOMAIN + 1];
581 struct timeval timeout;
587 sprintf(buf, "%s", broad_domain->dom_domain);
588 if (write(BROADFD, &buf, sizeof(buf)) < 0)
592 * Stay in sync with parent: wait for it to read our first
593 * message before sending the second.
597 FD_SET(BROADFD, &fds);
598 if (select(FD_SETSIZE, NULL, &fds, NULL, &timeout) == -1)
600 if (FD_ISSET(BROADFD, &fds)) {
601 if (write(BROADFD, addr, sizeof(struct sockaddr_in)) < 0)
612 broadcast_result(bool_t *out, struct sockaddr_in *addr)
614 if (retries >= MAX_RETRIES) {
615 bzero(addr, sizeof(struct sockaddr_in));
616 if (tell_parent(broad_domain->dom_domain, addr))
617 syslog(LOG_WARNING, "lost connection to parent");
621 if (yp_restricted && verify(addr->sin_addr)) {
623 syslog(LOG_NOTICE, "NIS server at %s not in restricted mode access list -- rejecting.\n",inet_ntoa(addr->sin_addr));
626 if (tell_parent(broad_domain->dom_domain, addr))
627 syslog(LOG_WARNING, "lost connection to parent");
633 * The right way to send RPC broadcasts.
634 * Use the clnt_broadcast() RPC service. Unfortunately, clnt_broadcast()
635 * blocks while waiting for replies, so we have to fork off separate
636 * broadcaster processes that do the waiting and then transmit their
637 * results back to the parent for processing. We also have to remember
638 * to save the name of the domain we're trying to bind in a global
639 * variable since clnt_broadcast() provides no way to pass things to
640 * the 'eachresult' callback function.
643 broadcast(struct _dom_binding *ypdb)
648 if (children >= MAX_CHILDREN || ypdb->dom_broadcast_pid)
651 if (pipe(ypdb->dom_pipe_fds) < 0) {
652 syslog(LOG_WARNING, "pipe: %m");
656 if (ypdb->dom_vers == -1 && (long)ypdb->dom_server_addr.sin_addr.s_addr)
657 syslog(LOG_WARNING, "NIS server [%s] for domain \"%s\" not responding",
658 inet_ntoa(ypdb->dom_server_addr.sin_addr), ypdb->dom_domain);
661 flock(ypdb->dom_lockfd, LOCK_UN);
663 switch ((ypdb->dom_broadcast_pid = fork())) {
666 signal(SIGCHLD, SIG_DFL);
667 signal(SIGTERM, SIG_DFL);
670 syslog(LOG_WARNING, "fork: %m");
676 FD_SET(READFD, &svc_fdset);
681 /* Release all locks before doing anything else. */
683 close(ypbindlist->dom_lockfd);
684 ypbindlist = ypbindlist->dom_pnext;
689 * Special 'many-cast' behavior. If we're in restricted mode,
690 * we have a list of possible server addresses to try. What
691 * we can do is transmit to each ypserv's YPPROC_DOMAIN_NONACK
692 * procedure and time the replies. Whoever replies fastest
693 * gets to be our server. Note that this is not a broadcast
694 * operation: we transmit uni-cast datagrams only.
696 if (yp_restricted && yp_manycast) {
699 struct sockaddr_in sin;
701 i = __yp_ping(restricted_addrs, yp_restricted,
702 ypdb->dom_domain, &port);
704 bzero(&ypdb->dom_server_addr,
705 sizeof(struct sockaddr_in));
706 if (tell_parent(ypdb->dom_domain,
707 &ypdb->dom_server_addr)) {
709 "lost connection to parent");
712 bzero(&sin, sizeof(struct sockaddr_in));
713 bcopy(&restricted_addrs[i],
714 &sin.sin_addr, sizeof(struct in_addr));
715 sin.sin_family = AF_INET;
717 if (tell_parent(broad_domain->dom_domain, &sin))
719 "lost connection to parent");
729 ptr = ypdb->dom_domain;
730 stat = clnt_broadcast(YPPROG, YPVERS, YPPROC_DOMAIN_NONACK,
731 (xdrproc_t)xdr_domainname, &ptr,
732 (xdrproc_t)xdr_bool, &out,
733 (resultproc_t)broadcast_result);
736 if (stat != RPC_SUCCESS) {
737 bzero(&ypdb->dom_server_addr, sizeof(struct sockaddr_in));
738 if (tell_parent(ypdb->dom_domain, &ypdb->dom_server_addr))
739 syslog(LOG_WARNING, "lost connection to parent");
746 * The right way to check if a server is alive.
747 * Attempt to get a client handle pointing to the server and send a
748 * YPPROC_DOMAIN. If we can't get a handle or we get a reply of FALSE,
749 * we invalidate this binding entry and send out a broadcast to try to
750 * establish a new binding. Note that we treat non-default domains
751 * specially: once bound, we keep tabs on our server, but if it
752 * goes away and fails to respond after one round of broadcasting, we
753 * abandon it until a client specifically references it again. We make
754 * every effort to keep our default domain bound, however, since we
755 * need it to keep the system on its feet.
758 ping(struct _dom_binding *ypdb)
761 struct timeval interval, timeout;
763 int rpcsock = RPC_ANYSOCK;
764 CLIENT *client_handle;
766 interval.tv_sec = FAIL_THRESHOLD;
767 interval.tv_usec = 0;
768 timeout.tv_sec = FAIL_THRESHOLD;
771 if (ypdb->dom_broadcast_pid)
774 if ((client_handle = clntudp_bufcreate(&ypdb->dom_server_addr,
775 YPPROG, YPVERS, interval, &rpcsock, RPCSMALLMSGSIZE,
776 RPCSMALLMSGSIZE)) == NULL) {
777 /* Can't get a handle: we're dead. */
787 ptr = ypdb->dom_domain;
789 stat = clnt_call(client_handle, YPPROC_DOMAIN,
790 (xdrproc_t)xdr_domainname, &ptr,
791 (xdrproc_t)xdr_bool, &out, timeout);
792 if (stat != RPC_SUCCESS || out == FALSE) {
795 clnt_destroy(client_handle);
801 clnt_destroy(client_handle);
806 rpc_received(char *dom, struct sockaddr_in *raddrp, int force)
808 struct _dom_binding *ypdb, *prev = NULL;
810 struct ypbind_resp ybr;
811 char path[MAXPATHLEN];
814 /*printf("returned from %s/%d about %s\n", inet_ntoa(raddrp->sin_addr),
815 ntohs(raddrp->sin_port), dom);*/
820 for (ypdb = ypbindlist; ypdb; ypdb = ypdb->dom_pnext) {
821 if (strcmp(ypdb->dom_domain, dom) == 0)
827 if (ypdb->dom_broadcast_pid) {
828 kill(ypdb->dom_broadcast_pid, SIGINT);
830 FD_CLR(READFD, &fdsr);
831 FD_CLR(READFD, &svc_fdset);
832 READFD = WRITEFD = -1;
836 /* if in secure mode, check originating port number */
837 if ((ypsecuremode && (ntohs(raddrp->sin_port) >= IPPORT_RESERVED))) {
838 syslog(LOG_WARNING, "Rejected NIS server on [%s/%d] for domain %s.",
839 inet_ntoa(raddrp->sin_addr), ntohs(raddrp->sin_port),
842 ypdb->dom_broadcast_pid = 0;
848 if (raddrp->sin_addr.s_addr == (long)0) {
849 switch (ypdb->dom_default) {
852 ypbindlist = ypdb->dom_pnext;
854 prev->dom_pnext = ypdb->dom_pnext;
855 sprintf(path, "%s/%s.%ld", BINDINGDIR,
856 ypdb->dom_domain, YPVERS);
857 close(ypdb->dom_lockfd);
863 ypdb->dom_broadcast_pid = 0;
875 ypdb = (struct _dom_binding *)malloc(sizeof *ypdb);
877 syslog(LOG_WARNING, "malloc: %m");
880 bzero(ypdb, sizeof *ypdb);
881 strncpy(ypdb->dom_domain, dom, sizeof ypdb->dom_domain);
882 ypdb->dom_lockfd = -1;
883 ypdb->dom_default = 0;
884 ypdb->dom_pnext = ypbindlist;
888 /* We've recovered from a crash: inform the world. */
889 if (ypdb->dom_vers == -1 && ypdb->dom_server_addr.sin_addr.s_addr)
890 syslog(LOG_WARNING, "NIS server [%s] for domain \"%s\" OK",
891 inet_ntoa(raddrp->sin_addr), ypdb->dom_domain);
893 bcopy(raddrp, &ypdb->dom_server_addr, sizeof ypdb->dom_server_addr);
895 ypdb->dom_vers = YPVERS;
897 ypdb->dom_broadcast_pid = 0;
899 if (ypdb->dom_lockfd != -1)
900 close(ypdb->dom_lockfd);
902 sprintf(path, "%s/%s.%ld", BINDINGDIR,
903 ypdb->dom_domain, ypdb->dom_vers);
905 if ((fd = open(path, O_CREAT|O_SHLOCK|O_RDWR|O_TRUNC, 0644)) == -1) {
906 mkdir(BINDINGDIR, 0755);
907 if ((fd = open(path, O_CREAT|O_SHLOCK|O_RDWR|O_TRUNC, 0644)) == -1)
911 if ((fd = open(path, O_CREAT|O_RDWR|O_TRUNC, 0644)) == -1) {
912 mkdir(BINDINGDIR, 0755);
913 if ((fd = open(path, O_CREAT|O_RDWR|O_TRUNC, 0644)) == -1)
920 * ok, if BINDINGDIR exists, and we can create the binding file,
923 ypdb->dom_lockfd = fd;
925 iov[0].iov_base = (char *)&(udptransp->xp_port);
926 iov[0].iov_len = sizeof udptransp->xp_port;
927 iov[1].iov_base = (char *)&ybr;
928 iov[1].iov_len = sizeof ybr;
930 bzero(&ybr, sizeof ybr);
931 ybr.ypbind_status = YPBIND_SUCC_VAL;
932 *(u_int32_t *)&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr = raddrp->sin_addr.s_addr;
933 *(u_short *)&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port = raddrp->sin_port;
935 if (writev(ypdb->dom_lockfd, iov, 2) != iov[0].iov_len + iov[1].iov_len) {
936 syslog(LOG_WARNING, "write: %m");
937 close(ypdb->dom_lockfd);
938 ypdb->dom_lockfd = -1;
944 * Check address against list of allowed servers. Return 0 if okay,
948 verify(struct in_addr addr)
952 for (i = 0; i < RESTRICTED_SERVERS; i++)
953 if (!bcmp(&addr, &restricted_addrs[i], sizeof(struct in_addr)))
960 * Try to set restricted mode. We default to normal mode if we can't
961 * resolve the specified hostnames.
964 yp_restricted_mode(char *args)
970 /* Find the restricted domain. */
971 if ((s = strsep(&args, ",")) == NULL)
975 /* Get the addresses of the servers. */
976 while ((s = strsep(&args, ",")) != NULL && i < RESTRICTED_SERVERS) {
977 if ((h = gethostbyname(s)) == NULL)
979 bcopy (h->h_addr_list[0], &restricted_addrs[i],
980 sizeof(struct in_addr));
984 /* ypset and ypsetme not allowed with restricted mode */
985 ypsetmode = YPSET_NO;