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984263bc MD |
1 | /* |
2 | * Copyright (c) 1995 | |
3 | * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by Bill Paul. | |
16 | * 4. Neither the name of the author nor the names of any co-contributors | |
17 | * may be used to endorse or promote products derived from this software | |
18 | * without specific prior written permission. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND | |
21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE | |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | * SUCH DAMAGE. | |
1de703da | 31 | * |
ce0e08e2 | 32 | * $FreeBSD: src/usr.sbin/ypserv/yp_main.c,v 1.29 2008/02/03 17:39:37 matteo Exp $ |
cac6c605 | 33 | * $DragonFly: src/usr.sbin/ypserv/yp_main.c,v 1.5 2005/11/24 22:23:02 swildner Exp $ |
984263bc MD |
34 | */ |
35 | ||
984263bc MD |
36 | /* |
37 | * ypserv startup function. | |
38 | * We need out own main() since we have to do some additional work | |
39 | * that rpcgen won't do for us. Most of this file was generated using | |
40 | * rpcgen.new, and later modified. | |
41 | */ | |
42 | ||
43 | #include "yp.h" | |
44 | #include <err.h> | |
45 | #include <errno.h> | |
46 | #include <memory.h> | |
47 | #include <stdio.h> | |
48 | #include <signal.h> | |
49 | #include <stdlib.h> /* getenv, exit */ | |
50 | #include <string.h> /* strcmp */ | |
51 | #include <syslog.h> | |
52 | #include <unistd.h> | |
53 | #include <rpc/pmap_clnt.h> /* for pmap_unset */ | |
54 | #ifdef __cplusplus | |
55 | #include <sysent.h> /* getdtablesize, open */ | |
56 | #endif /* __cplusplus */ | |
57 | #include <sys/socket.h> | |
58 | #include <netinet/in.h> | |
59 | #include <sys/wait.h> | |
60 | #include "yp_extern.h" | |
61 | #include <rpc/rpc.h> | |
62 | ||
63 | #ifndef SIG_PF | |
64 | #define SIG_PF void(*)(int) | |
65 | #endif | |
66 | ||
67 | #define _RPCSVC_CLOSEDOWN 120 | |
68 | int _rpcpmstart; /* Started by a port monitor ? */ | |
69 | static int _rpcfdtype; | |
70 | /* Whether Stream or Datagram ? */ | |
71 | /* States a server can be in wrt request */ | |
72 | ||
73 | #define _IDLE 0 | |
74 | #define _SERVED 1 | |
75 | #define _SERVING 2 | |
76 | ||
7bb1f61f CP |
77 | extern void ypprog_1(struct svc_req *, SVCXPRT *); |
78 | extern void ypprog_2(struct svc_req *, SVCXPRT *); | |
984263bc MD |
79 | extern int _rpc_dtablesize(void); |
80 | extern int _rpcsvcstate; /* Set when a request is serviced */ | |
81 | char *progname = "ypserv"; | |
299d9671 | 82 | const char *yp_dir = _PATH_YP; |
984263bc MD |
83 | /*int debug = 0;*/ |
84 | int do_dns = 0; | |
85 | int resfd; | |
86 | ||
ce0e08e2 PA |
87 | struct socktype { |
88 | const char *st_name; | |
89 | int st_type; | |
90 | }; | |
91 | static struct socktype stlist[] = { | |
92 | { "tcp", SOCK_STREAM }, | |
93 | { "udp", SOCK_DGRAM }, | |
94 | { NULL, 0 } | |
95 | }; | |
96 | ||
7bb1f61f CP |
97 | static void |
98 | _msgout(char *msg) | |
984263bc MD |
99 | { |
100 | if (debug) { | |
101 | if (_rpcpmstart) | |
102 | syslog(LOG_ERR, "%s", msg); | |
103 | else | |
104 | warnx("%s", msg); | |
105 | } else | |
106 | syslog(LOG_ERR, "%s", msg); | |
107 | } | |
108 | ||
109 | pid_t yp_pid; | |
110 | ||
111 | static void | |
7bb1f61f | 112 | yp_svc_run(void) |
984263bc MD |
113 | { |
114 | #ifdef FD_SETSIZE | |
115 | fd_set readfds; | |
116 | #else | |
117 | int readfds; | |
118 | #endif /* def FD_SETSIZE */ | |
984263bc MD |
119 | int fd_setsize = _rpc_dtablesize(); |
120 | struct timeval timeout; | |
121 | ||
122 | /* Establish the identity of the parent ypserv process. */ | |
123 | yp_pid = getpid(); | |
124 | ||
125 | for (;;) { | |
126 | #ifdef FD_SETSIZE | |
127 | readfds = svc_fdset; | |
128 | #else | |
129 | readfds = svc_fds; | |
130 | #endif /* def FD_SETSIZE */ | |
131 | ||
132 | FD_SET(resfd, &readfds); | |
133 | ||
134 | timeout.tv_sec = RESOLVER_TIMEOUT; | |
135 | timeout.tv_usec = 0; | |
136 | switch (select(fd_setsize, &readfds, NULL, NULL, | |
137 | &timeout)) { | |
138 | case -1: | |
139 | if (errno == EINTR) { | |
140 | continue; | |
141 | } | |
142 | warn("svc_run: - select failed"); | |
143 | return; | |
144 | case 0: | |
145 | if (getpid() == yp_pid) | |
146 | yp_prune_dnsq(); | |
147 | break; | |
148 | default: | |
149 | if (getpid() == yp_pid) { | |
150 | if (FD_ISSET(resfd, &readfds)) { | |
151 | yp_run_dnsq(); | |
152 | FD_CLR(resfd, &readfds); | |
153 | } | |
154 | svc_getreqset(&readfds); | |
155 | } | |
156 | } | |
157 | if (yp_pid != getpid()) | |
158 | _exit(0); | |
159 | } | |
160 | } | |
161 | ||
7bb1f61f CP |
162 | static void |
163 | unregister(void) | |
984263bc | 164 | { |
7bb1f61f CP |
165 | pmap_unset(YPPROG, YPVERS); |
166 | pmap_unset(YPPROG, YPOLDVERS); | |
984263bc MD |
167 | } |
168 | ||
cac6c605 SW |
169 | static void |
170 | reaper(int sig) | |
984263bc | 171 | { |
7bb1f61f CP |
172 | int status; |
173 | int saved_errno; | |
984263bc MD |
174 | |
175 | saved_errno = errno; | |
176 | ||
177 | if (sig == SIGHUP) { | |
178 | load_securenets(); | |
179 | #ifdef DB_CACHE | |
180 | yp_flush_all(); | |
181 | #endif | |
182 | errno = saved_errno; | |
183 | return; | |
184 | } | |
185 | ||
186 | if (sig == SIGCHLD) { | |
187 | while (wait3(&status, WNOHANG, NULL) > 0) | |
188 | children--; | |
189 | } else { | |
190 | unregister(); | |
191 | exit(0); | |
192 | } | |
193 | errno = saved_errno; | |
194 | return; | |
195 | } | |
196 | ||
7bb1f61f CP |
197 | static void |
198 | usage(void) | |
984263bc | 199 | { |
ce0e08e2 | 200 | fprintf(stderr, "usage: ypserv [-h] [-d] [-n] [-p path] [-P port]\n"); |
984263bc MD |
201 | exit(1); |
202 | } | |
203 | ||
204 | static void | |
205 | closedown(int sig) | |
206 | { | |
207 | if (_rpcsvcstate == _IDLE) { | |
208 | extern fd_set svc_fdset; | |
209 | static int size; | |
210 | int i, openfd; | |
211 | ||
212 | if (_rpcfdtype == SOCK_DGRAM) { | |
213 | unregister(); | |
214 | exit(0); | |
215 | } | |
216 | if (size == 0) { | |
217 | size = getdtablesize(); | |
218 | } | |
219 | for (i = 0, openfd = 0; i < size && openfd < 2; i++) | |
220 | if (FD_ISSET(i, &svc_fdset)) | |
221 | openfd++; | |
222 | if (openfd <= 1) { | |
223 | unregister(); | |
224 | exit(0); | |
225 | } | |
226 | } | |
227 | if (_rpcsvcstate == _SERVED) | |
228 | _rpcsvcstate = _IDLE; | |
229 | ||
7bb1f61f CP |
230 | signal(SIGALRM, (SIG_PF)closedown); |
231 | alarm(_RPCSVC_CLOSEDOWN / 2); | |
984263bc MD |
232 | } |
233 | ||
234 | int | |
7bb1f61f | 235 | main(int argc, char **argv) |
984263bc | 236 | { |
7bb1f61f | 237 | SVCXPRT *transp = NULL; |
984263bc MD |
238 | int sock; |
239 | int proto = 0; | |
240 | struct sockaddr_in saddr; | |
ce0e08e2 | 241 | socklen_t asize = sizeof (saddr); |
984263bc | 242 | int ch; |
ce0e08e2 PA |
243 | in_port_t yp_port = 0; |
244 | char *errstr; | |
245 | struct socktype *st; | |
984263bc | 246 | |
ce0e08e2 | 247 | while ((ch = getopt(argc, argv, "hdnp:P:")) != -1) { |
984263bc MD |
248 | switch (ch) { |
249 | case 'd': | |
250 | debug = ypdb_debug = 1; | |
251 | break; | |
252 | case 'n': | |
253 | do_dns = 1; | |
254 | break; | |
255 | case 'p': | |
256 | yp_dir = optarg; | |
257 | break; | |
ce0e08e2 PA |
258 | case 'P': |
259 | yp_port = (in_port_t)strtonum(optarg, 1, 65535, | |
260 | (const char **)&errstr); | |
261 | if (yp_port == 0 && errstr != NULL) { | |
262 | _msgout("invalid port number provided"); | |
263 | exit(1); | |
264 | } | |
265 | break; | |
984263bc MD |
266 | case 'h': |
267 | default: | |
268 | usage(); | |
269 | } | |
270 | } | |
271 | ||
272 | load_securenets(); | |
273 | yp_init_resolver(); | |
274 | #ifdef DB_CACHE | |
275 | yp_init_dbs(); | |
276 | #endif | |
277 | if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { | |
278 | int ssize = sizeof (int); | |
279 | ||
280 | if (saddr.sin_family != AF_INET) | |
281 | exit(1); | |
282 | if (getsockopt(0, SOL_SOCKET, SO_TYPE, | |
283 | (char *)&_rpcfdtype, &ssize) == -1) | |
284 | exit(1); | |
285 | sock = 0; | |
286 | _rpcpmstart = 1; | |
287 | proto = 0; | |
288 | openlog("ypserv", LOG_PID, LOG_DAEMON); | |
289 | } else { | |
290 | if (!debug) { | |
291 | if (daemon(0,0)) { | |
292 | err(1,"cannot fork"); | |
293 | } | |
294 | openlog("ypserv", LOG_PID, LOG_DAEMON); | |
295 | } | |
296 | sock = RPC_ANYSOCK; | |
71126e33 SW |
297 | pmap_unset(YPPROG, YPVERS); |
298 | pmap_unset(YPPROG, 1); | |
984263bc MD |
299 | } |
300 | ||
ce0e08e2 PA |
301 | /* |
302 | * Initialize TCP/UDP sockets. | |
303 | */ | |
304 | memset((char *)&saddr, 0, sizeof(saddr)); | |
305 | saddr.sin_family = AF_INET; | |
306 | saddr.sin_addr.s_addr = htonl(INADDR_ANY); | |
307 | saddr.sin_port = htons(yp_port); | |
308 | for (st = stlist; st->st_name != NULL; st++) { | |
309 | /* Do not bind the socket if the user didn't specify a port */ | |
310 | if (yp_port == 0) | |
311 | break; | |
312 | ||
313 | sock = socket(AF_INET, st->st_type, 0); | |
314 | if (sock == -1) { | |
315 | if ((asprintf(&errstr, "cannot create a %s socket", | |
316 | st->st_name)) == -1) | |
317 | err(1, "unexpected failure in asprintf()"); | |
318 | _msgout(errstr); | |
319 | free((void *)errstr); | |
320 | exit(1); | |
321 | } | |
322 | if (bind(sock, (struct sockaddr *) &saddr, sizeof(saddr)) | |
323 | == -1) { | |
324 | if ((asprintf(&errstr, "cannot bind %s socket", | |
325 | st->st_name)) == -1) | |
326 | err(1, "unexpected failure in asprintf()"); | |
327 | _msgout(errstr); | |
328 | free((void *)errstr); | |
329 | exit(1); | |
330 | } | |
331 | errstr = NULL; | |
332 | } | |
333 | ||
984263bc MD |
334 | if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { |
335 | transp = svcudp_create(sock); | |
336 | if (transp == NULL) { | |
337 | _msgout("cannot create udp service"); | |
338 | exit(1); | |
339 | } | |
340 | if (!_rpcpmstart) | |
341 | proto = IPPROTO_UDP; | |
342 | if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { | |
343 | _msgout("unable to register (YPPROG, YPOLDVERS, udp)"); | |
344 | exit(1); | |
345 | } | |
346 | if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { | |
347 | _msgout("unable to register (YPPROG, YPVERS, udp)"); | |
348 | exit(1); | |
349 | } | |
350 | } | |
351 | ||
352 | if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { | |
353 | transp = svctcp_create(sock, 0, 0); | |
354 | if (transp == NULL) { | |
355 | _msgout("cannot create tcp service"); | |
356 | exit(1); | |
357 | } | |
358 | if (!_rpcpmstart) | |
359 | proto = IPPROTO_TCP; | |
360 | if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { | |
361 | _msgout("unable to register (YPPROG, YPOLDVERS, tcp)"); | |
362 | exit(1); | |
363 | } | |
364 | if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { | |
365 | _msgout("unable to register (YPPROG, YPVERS, tcp)"); | |
366 | exit(1); | |
367 | } | |
368 | } | |
369 | ||
2038fb68 | 370 | if (transp == NULL) { |
984263bc MD |
371 | _msgout("could not create a handle"); |
372 | exit(1); | |
373 | } | |
374 | if (_rpcpmstart) { | |
7bb1f61f CP |
375 | signal(SIGALRM, (SIG_PF)closedown); |
376 | alarm(_RPCSVC_CLOSEDOWN / 2); | |
984263bc MD |
377 | } |
378 | /* | |
379 | * Make sure SIGPIPE doesn't blow us away while servicing TCP | |
380 | * connections. | |
381 | */ | |
7bb1f61f CP |
382 | signal(SIGPIPE, SIG_IGN); |
383 | signal(SIGCHLD, (SIG_PF) reaper); | |
384 | signal(SIGTERM, (SIG_PF) reaper); | |
385 | signal(SIGINT, (SIG_PF) reaper); | |
386 | signal(SIGHUP, (SIG_PF) reaper); | |
984263bc MD |
387 | yp_svc_run(); |
388 | _msgout("svc_run returned"); | |
389 | exit(1); | |
390 | /* NOTREACHED */ | |
391 | } |