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 "ypxfrd.h"
37 #include <err.h>
38 #include <fcntl.h>
39 #include <paths.h>
40 #include <stdio.h>
41 #include <stdlib.h> /* getenv, exit */
42 #include <unistd.h>
43 #include <rpc/pmap_clnt.h> /* for pmap_unset */
44 #include <rpc/rpc_com.h>
45 #include <string.h> /* strcmp */
46 #include <signal.h>
47 #include <sys/ttycom.h> /* TIOCNOTTY */
48 #ifdef __cplusplus
49 #include <sysent.h> /* getdtablesize, open */
50 #endif /* __cplusplus */
51 #include <memory.h>
52 #include <sys/socket.h>
53 #include <netinet/in.h>
54 #include <syslog.h>
55 #include "ypxfrd_extern.h"
56 #include <sys/wait.h>
57 #include <errno.h>
58
59 #ifndef SIG_PF
60 #define SIG_PF void(*)(int)
61 #endif
62
63 #ifdef DEBUG
64 #define RPC_SVC_FG
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
77 extern int _rpcsvcstate; /* Set when a request is serviced */
78
79 int debug;
80
81 char *progname = "rpc.ypxfrd";
82 char *yp_dir = "/var/yp/";
83
84 static void
_msgout(char * msg)85 _msgout(char *msg)
86 {
87 #ifdef RPC_SVC_FG
88 if (_rpcpmstart)
89 syslog(LOG_ERR, "%s", msg);
90 else
91 warnx("%s", msg);
92 #else
93 syslog(LOG_ERR, "%s", msg);
94 #endif
95 }
96
97 static void
closedown(int sig)98 closedown(int sig)
99 {
100 if (_rpcsvcstate == _IDLE) {
101 extern fd_set svc_fdset;
102 static int size;
103 int i, openfd;
104
105 if (_rpcfdtype == SOCK_DGRAM)
106 exit(0);
107 if (size == 0) {
108 size = getdtablesize();
109 }
110 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
111 if (FD_ISSET(i, &svc_fdset))
112 openfd++;
113 if (openfd <= 1)
114 exit(0);
115 }
116 if (_rpcsvcstate == _SERVED)
117 _rpcsvcstate = _IDLE;
118
119 (void) signal(SIGALRM, (SIG_PF) closedown);
120 (void) alarm(_RPCSVC_CLOSEDOWN/2);
121 }
122
123
124 static void
ypxfrd_svc_run(void)125 ypxfrd_svc_run(void)
126 {
127 #ifdef FD_SETSIZE
128 fd_set readfds;
129 #else
130 int readfds;
131 #endif /* def FD_SETSIZE */
132 extern int forked;
133 int pid;
134 int fd_setsize = _rpc_dtablesize();
135
136 /* Establish the identity of the parent ypserv process. */
137 pid = getpid();
138
139 for (;;) {
140 #ifdef FD_SETSIZE
141 readfds = svc_fdset;
142 #else
143 readfds = svc_fds;
144 #endif /* def FD_SETSIZE */
145 switch (select(fd_setsize, &readfds, NULL, NULL,
146 (struct timeval *)0)) {
147 case -1:
148 if (errno == EINTR) {
149 continue;
150 }
151 warn("svc_run: - select failed");
152 return;
153 case 0:
154 continue;
155 default:
156 svc_getreqset(&readfds);
157 if (forked && pid != getpid())
158 exit(0);
159 }
160 }
161 }
162
reaper(int sig)163 static void reaper(int sig)
164 {
165 int status;
166 int saved_errno;
167
168 saved_errno = errno;
169
170 if (sig == SIGHUP) {
171 load_securenets();
172 errno = saved_errno;
173 return;
174 }
175
176 if (sig == SIGCHLD) {
177 while (wait3(&status, WNOHANG, NULL) > 0)
178 children--;
179 } else {
180 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
181 exit(0);
182 }
183
184 errno = saved_errno;
185 }
186
187 void
usage(void)188 usage(void)
189 {
190 fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
191 exit(0);
192 }
193
194 int
main(int argc,char * argv[])195 main(int argc, char *argv[])
196 {
197 register SVCXPRT *transp = NULL;
198 int sock;
199 int proto = 0;
200 struct sockaddr_in saddr;
201 int asize = sizeof (saddr);
202 int ch;
203
204 while ((ch = getopt(argc, argv, "p:h")) != -1) {
205 switch (ch) {
206 case 'p':
207 yp_dir = optarg;
208 break;
209 default:
210 usage();
211 break;
212 }
213 }
214
215 load_securenets();
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.ypxfrd", LOG_PID, LOG_DAEMON);
229 } else {
230 #ifndef RPC_SVC_FG
231 int size;
232 int pid, i;
233
234 pid = fork();
235 if (pid < 0)
236 err(1, "fork");
237 if (pid)
238 exit(0);
239 size = getdtablesize();
240 for (i = 0; i < size; i++)
241 (void) close(i);
242 i = open(_PATH_CONSOLE, 2);
243 (void) dup2(i, 1);
244 (void) dup2(i, 2);
245 i = open(_PATH_TTY, 2);
246 if (i >= 0) {
247 (void) ioctl(i, TIOCNOTTY, (char *)NULL);
248 (void) close(i);
249 }
250 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
251 #endif
252 sock = RPC_ANYSOCK;
253 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
254 }
255
256 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
257 transp = svcudp_create(sock);
258 if (transp == NULL) {
259 _msgout("cannot create udp service.");
260 exit(1);
261 }
262 if (!_rpcpmstart)
263 proto = IPPROTO_UDP;
264 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
265 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
266 exit(1);
267 }
268 }
269
270 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
271 transp = svctcp_create(sock, 0, 0);
272 if (transp == NULL) {
273 _msgout("cannot create tcp service.");
274 exit(1);
275 }
276 if (!_rpcpmstart)
277 proto = IPPROTO_TCP;
278 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
279 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
280 exit(1);
281 }
282 }
283
284 if (transp == (SVCXPRT *)NULL) {
285 _msgout("could not create a handle");
286 exit(1);
287 }
288 if (_rpcpmstart) {
289 (void) signal(SIGALRM, (SIG_PF) closedown);
290 (void) alarm(_RPCSVC_CLOSEDOWN/2);
291 }
292
293 (void) signal(SIGPIPE, SIG_IGN);
294 (void) signal(SIGCHLD, (SIG_PF) reaper);
295 (void) signal(SIGTERM, (SIG_PF) reaper);
296 (void) signal(SIGINT, (SIG_PF) reaper);
297 (void) signal(SIGHUP, (SIG_PF) reaper);
298
299 ypxfrd_svc_run();
300 _msgout("svc_run returned");
301 exit(1);
302 /* NOTREACHED */
303 }
304