1 /*-
2  * SPDX-License-Identifier: BSD-4-Clause
3  *
4  * Copyright (c) 1995, 1996
5  *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
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. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by Bill Paul.
18  * 4. Neither the name of the author nor the names of any co-contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #include <sys/cdefs.h>
36 #include "ypupdate_prot.h"
37 #include <stdio.h>
38 #include <stdlib.h> /* getenv, exit */
39 #include <rpc/pmap_clnt.h> /* for pmap_unset */
40 #include <rpc/rpc_com.h>
41 #include <string.h> /* strcmp */
42 #include <signal.h>
43 #ifdef __cplusplus
44 #include <sysent.h> /* getdtablesize, open */
45 #endif /* __cplusplus */
46 #include <memory.h>
47 #include <sys/socket.h>
48 #include <netinet/in.h>
49 #include <syslog.h>
50 #include <sys/wait.h>
51 #include <errno.h>
52 #include <err.h>
53 #include <unistd.h>
54 #include "ypupdated_extern.h"
55 #include "yp_extern.h"
56 
57 #ifndef SIG_PF
58 #define	SIG_PF void(*)(int)
59 #endif
60 
61 #ifdef DEBUG
62 #define	RPC_SVC_FG
63 #endif
64 
65 #define	_RPCSVC_CLOSEDOWN 120
66 int _rpcpmstart;		/* Started by a port monitor ? */
67 static int _rpcfdtype;
68 		 /* Whether Stream or Datagram ? */
69 	/* States a server can be in wrt request */
70 
71 #define	_IDLE 0
72 #define	_SERVED 1
73 #define	_SERVING 2
74 
75 extern int _rpcsvcstate;	 /* Set when a request is serviced */
76 
77 int debug;
78 
79 char *progname = "rpc.ypupdated";
80 char *yp_dir = "/var/yp/";
81 
82 static void
83 _msgout(char* msg)
84 {
85 #ifdef RPC_SVC_FG
86 	if (_rpcpmstart)
87 		syslog(LOG_ERR, "%s", msg);
88 	else
89 		warnx("%s", msg);
90 #else
91 	syslog(LOG_ERR, "%s", msg);
92 #endif
93 }
94 
95 static void
96 closedown(int sig)
97 {
98 	if (_rpcsvcstate == _IDLE) {
99 		extern fd_set svc_fdset;
100 		static int size;
101 		int i, openfd;
102 
103 		if (_rpcfdtype == SOCK_DGRAM)
104 			exit(0);
105 		if (size == 0) {
106 			size = getdtablesize();
107 		}
108 		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
109 			if (FD_ISSET(i, &svc_fdset))
110 				openfd++;
111 		if (openfd <= 1)
112 			exit(0);
113 	}
114 	if (_rpcsvcstate == _SERVED)
115 		_rpcsvcstate = _IDLE;
116 
117 	(void) signal(SIGALRM, (SIG_PF) closedown);
118 	(void) alarm(_RPCSVC_CLOSEDOWN/2);
119 }
120 
121 static void
122 ypupdated_svc_run(void)
123 {
124 #ifdef FD_SETSIZE
125 	fd_set readfds;
126 #else
127 	int readfds;
128 #endif /* def FD_SETSIZE */
129 	extern int forked;
130 	int pid;
131 	int fd_setsize = _rpc_dtablesize();
132 
133 	/* Establish the identity of the parent ypupdated process. */
134 	pid = getpid();
135 
136 	for (;;) {
137 #ifdef FD_SETSIZE
138 		readfds = svc_fdset;
139 #else
140 		readfds = svc_fds;
141 #endif /* def FD_SETSIZE */
142 		switch (select(fd_setsize, &readfds, NULL, NULL,
143 			       (struct timeval *)0)) {
144 		case -1:
145 			if (errno == EINTR) {
146 				continue;
147 			}
148 			warn("svc_run: - select failed");
149 			return;
150 		case 0:
151 			continue;
152 		default:
153 			svc_getreqset(&readfds);
154 			if (forked && pid != getpid())
155 				exit(0);
156 		}
157 	}
158 }
159 
160 static void
161 reaper(int sig)
162 {
163 	int status;
164 
165 	if (sig == SIGHUP) {
166 #ifdef foo
167 		load_securenets();
168 #endif
169 		return;
170 	}
171 
172 	if (sig == SIGCHLD) {
173 		while (wait3(&status, WNOHANG, NULL) > 0)
174 			children--;
175 	} else {
176 		(void) pmap_unset(YPU_PROG, YPU_VERS);
177 		exit(0);
178 	}
179 }
180 
181 void
182 usage(void)
183 {
184 	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
185 	exit(0);
186 }
187 
188 int
189 main(int argc, char *argv[])
190 {
191 	register SVCXPRT *transp = NULL;
192 	int sock;
193 	int proto = 0;
194 	struct sockaddr_in saddr;
195 	int asize = sizeof (saddr);
196 	int ch;
197 
198 	while ((ch = getopt(argc, argv, "p:h")) != -1) {
199 		switch (ch) {
200 		case 'p':
201 			yp_dir = optarg;
202 			break;
203 		default:
204 			usage();
205 			break;
206 		}
207 	}
208 #ifdef foo
209 	load_securenets();
210 #endif
211 
212 	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
213 		yp_error("failed to register AUTH_DES flavor");
214 		exit(1);
215 	}
216 
217 	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
218 		int ssize = sizeof (int);
219 
220 		if (saddr.sin_family != AF_INET)
221 			exit(1);
222 		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
223 				(char *)&_rpcfdtype, &ssize) == -1)
224 			exit(1);
225 		sock = 0;
226 		_rpcpmstart = 1;
227 		proto = 0;
228 		openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
229 	} else {
230 #ifndef RPC_SVC_FG
231 		if (daemon(0,0)) {
232 			err(1, "cannot fork");
233 		}
234 		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
235 #endif
236 		sock = RPC_ANYSOCK;
237 		(void) pmap_unset(YPU_PROG, YPU_VERS);
238 	}
239 
240 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
241 		transp = svcudp_create(sock);
242 		if (transp == NULL) {
243 			_msgout("cannot create udp service.");
244 			exit(1);
245 		}
246 		if (!_rpcpmstart)
247 			proto = IPPROTO_UDP;
248 		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
249 			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
250 			exit(1);
251 		}
252 	}
253 
254 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
255 		transp = svctcp_create(sock, 0, 0);
256 		if (transp == NULL) {
257 			_msgout("cannot create tcp service.");
258 			exit(1);
259 		}
260 		if (!_rpcpmstart)
261 			proto = IPPROTO_TCP;
262 		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
263 			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
264 			exit(1);
265 		}
266 	}
267 
268 	if (transp == (SVCXPRT *)NULL) {
269 		_msgout("could not create a handle");
270 		exit(1);
271 	}
272 	if (_rpcpmstart) {
273 		(void) signal(SIGALRM, (SIG_PF) closedown);
274 		(void) alarm(_RPCSVC_CLOSEDOWN/2);
275 	}
276 
277 	(void) signal(SIGPIPE, SIG_IGN);
278 	(void) signal(SIGCHLD, (SIG_PF) reaper);
279 	(void) signal(SIGTERM, (SIG_PF) reaper);
280 	(void) signal(SIGINT, (SIG_PF) reaper);
281 	(void) signal(SIGHUP, (SIG_PF) reaper);
282 
283 	ypupdated_svc_run();
284 	_msgout("svc_run returned");
285 	exit(1);
286 	/* NOTREACHED */
287 }
288