Add missing backslash.
[dragonfly.git] / usr.sbin / ypserv / yp_main.c
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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.
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31 *
32 * $FreeBSD: src/usr.sbin/ypserv/yp_main.c,v 1.21.2.3 2002/02/15 00:47:00 des Exp $
7bb1f61f 33 * $DragonFly: src/usr.sbin/ypserv/yp_main.c,v 1.3 2004/03/31 23:20:22 cpressey Exp $
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34 */
35
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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
68int _rpcpmstart; /* Started by a port monitor ? */
69static 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
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77extern void ypprog_1(struct svc_req *, SVCXPRT *);
78extern void ypprog_2(struct svc_req *, SVCXPRT *);
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79extern int _rpc_dtablesize(void);
80extern int _rpcsvcstate; /* Set when a request is serviced */
81char *progname = "ypserv";
82char *yp_dir = _PATH_YP;
83/*int debug = 0;*/
84int do_dns = 0;
85int resfd;
86
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87static void
88_msgout(char *msg)
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89{
90 if (debug) {
91 if (_rpcpmstart)
92 syslog(LOG_ERR, "%s", msg);
93 else
94 warnx("%s", msg);
95 } else
96 syslog(LOG_ERR, "%s", msg);
97}
98
99pid_t yp_pid;
100
101static void
7bb1f61f 102yp_svc_run(void)
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103{
104#ifdef FD_SETSIZE
105 fd_set readfds;
106#else
107 int readfds;
108#endif /* def FD_SETSIZE */
109 extern int forked;
110 int fd_setsize = _rpc_dtablesize();
111 struct timeval timeout;
112
113 /* Establish the identity of the parent ypserv process. */
114 yp_pid = getpid();
115
116 for (;;) {
117#ifdef FD_SETSIZE
118 readfds = svc_fdset;
119#else
120 readfds = svc_fds;
121#endif /* def FD_SETSIZE */
122
123 FD_SET(resfd, &readfds);
124
125 timeout.tv_sec = RESOLVER_TIMEOUT;
126 timeout.tv_usec = 0;
127 switch (select(fd_setsize, &readfds, NULL, NULL,
128 &timeout)) {
129 case -1:
130 if (errno == EINTR) {
131 continue;
132 }
133 warn("svc_run: - select failed");
134 return;
135 case 0:
136 if (getpid() == yp_pid)
137 yp_prune_dnsq();
138 break;
139 default:
140 if (getpid() == yp_pid) {
141 if (FD_ISSET(resfd, &readfds)) {
142 yp_run_dnsq();
143 FD_CLR(resfd, &readfds);
144 }
145 svc_getreqset(&readfds);
146 }
147 }
148 if (yp_pid != getpid())
149 _exit(0);
150 }
151}
152
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153static void
154unregister(void)
984263bc 155{
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156 pmap_unset(YPPROG, YPVERS);
157 pmap_unset(YPPROG, YPOLDVERS);
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158}
159
7bb1f61f 160static void reaper(int sig)
984263bc 161{
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162 int status;
163 int saved_errno;
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164
165 saved_errno = errno;
166
167 if (sig == SIGHUP) {
168 load_securenets();
169#ifdef DB_CACHE
170 yp_flush_all();
171#endif
172 errno = saved_errno;
173 return;
174 }
175
176 if (sig == SIGCHLD) {
177 while (wait3(&status, WNOHANG, NULL) > 0)
178 children--;
179 } else {
180 unregister();
181 exit(0);
182 }
183 errno = saved_errno;
184 return;
185}
186
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187static void
188usage(void)
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189{
190 fprintf(stderr, "usage: ypserv [-h] [-d] [-n] [-p path]\n");
191 exit(1);
192}
193
194static void
195closedown(int sig)
196{
197 if (_rpcsvcstate == _IDLE) {
198 extern fd_set svc_fdset;
199 static int size;
200 int i, openfd;
201
202 if (_rpcfdtype == SOCK_DGRAM) {
203 unregister();
204 exit(0);
205 }
206 if (size == 0) {
207 size = getdtablesize();
208 }
209 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
210 if (FD_ISSET(i, &svc_fdset))
211 openfd++;
212 if (openfd <= 1) {
213 unregister();
214 exit(0);
215 }
216 }
217 if (_rpcsvcstate == _SERVED)
218 _rpcsvcstate = _IDLE;
219
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220 signal(SIGALRM, (SIG_PF)closedown);
221 alarm(_RPCSVC_CLOSEDOWN / 2);
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222}
223
224int
7bb1f61f 225main(int argc, char **argv)
984263bc 226{
7bb1f61f 227 SVCXPRT *transp = NULL;
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228 int sock;
229 int proto = 0;
230 struct sockaddr_in saddr;
7bb1f61f 231 int asize = sizeof(saddr);
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232 int ch;
233
234 while ((ch = getopt(argc, argv, "hdnp:")) != -1) {
235 switch (ch) {
236 case 'd':
237 debug = ypdb_debug = 1;
238 break;
239 case 'n':
240 do_dns = 1;
241 break;
242 case 'p':
243 yp_dir = optarg;
244 break;
245 case 'h':
246 default:
247 usage();
248 }
249 }
250
251 load_securenets();
252 yp_init_resolver();
253#ifdef DB_CACHE
254 yp_init_dbs();
255#endif
256 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
257 int ssize = sizeof (int);
258
259 if (saddr.sin_family != AF_INET)
260 exit(1);
261 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
262 (char *)&_rpcfdtype, &ssize) == -1)
263 exit(1);
264 sock = 0;
265 _rpcpmstart = 1;
266 proto = 0;
267 openlog("ypserv", LOG_PID, LOG_DAEMON);
268 } else {
269 if (!debug) {
270 if (daemon(0,0)) {
271 err(1,"cannot fork");
272 }
273 openlog("ypserv", LOG_PID, LOG_DAEMON);
274 }
275 sock = RPC_ANYSOCK;
276 (void) pmap_unset(YPPROG, YPVERS);
277 (void) pmap_unset(YPPROG, 1);
278 }
279
280 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
281 transp = svcudp_create(sock);
282 if (transp == NULL) {
283 _msgout("cannot create udp service");
284 exit(1);
285 }
286 if (!_rpcpmstart)
287 proto = IPPROTO_UDP;
288 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
289 _msgout("unable to register (YPPROG, YPOLDVERS, udp)");
290 exit(1);
291 }
292 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
293 _msgout("unable to register (YPPROG, YPVERS, udp)");
294 exit(1);
295 }
296 }
297
298 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
299 transp = svctcp_create(sock, 0, 0);
300 if (transp == NULL) {
301 _msgout("cannot create tcp service");
302 exit(1);
303 }
304 if (!_rpcpmstart)
305 proto = IPPROTO_TCP;
306 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
307 _msgout("unable to register (YPPROG, YPOLDVERS, tcp)");
308 exit(1);
309 }
310 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
311 _msgout("unable to register (YPPROG, YPVERS, tcp)");
312 exit(1);
313 }
314 }
315
316 if (transp == (SVCXPRT *)NULL) {
317 _msgout("could not create a handle");
318 exit(1);
319 }
320 if (_rpcpmstart) {
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321 signal(SIGALRM, (SIG_PF)closedown);
322 alarm(_RPCSVC_CLOSEDOWN / 2);
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323 }
324/*
325 * Make sure SIGPIPE doesn't blow us away while servicing TCP
326 * connections.
327 */
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328 signal(SIGPIPE, SIG_IGN);
329 signal(SIGCHLD, (SIG_PF) reaper);
330 signal(SIGTERM, (SIG_PF) reaper);
331 signal(SIGINT, (SIG_PF) reaper);
332 signal(SIGHUP, (SIG_PF) reaper);
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333 yp_svc_run();
334 _msgout("svc_run returned");
335 exit(1);
336 /* NOTREACHED */
337}