1 /*
2 * Copyright (c) 1995, 1996
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.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
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 char *progname = "rpc.ypxfrd";
80 char *yp_dir = "/var/yp/";
81
82 static void
_msgout(char * msg)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
closedown(int sig)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
122 static void
ypxfrd_svc_run(void)123 ypxfrd_svc_run(void)
124 {
125 #ifdef FD_SETSIZE
126 fd_set readfds;
127 #else
128 int readfds;
129 #endif /* def FD_SETSIZE */
130 extern int forked;
131 int pid;
132 int fd_setsize = _rpc_dtablesize();
133
134 /* Establish the identity of the parent ypserv process. */
135 pid = getpid();
136
137 for (;;) {
138 #ifdef FD_SETSIZE
139 readfds = svc_fdset;
140 #else
141 readfds = svc_fds;
142 #endif /* def FD_SETSIZE */
143 switch (select(fd_setsize, &readfds, NULL, NULL,
144 (struct timeval *)0)) {
145 case -1:
146 if (errno == EINTR) {
147 continue;
148 }
149 warn("svc_run: - select failed");
150 return;
151 case 0:
152 continue;
153 default:
154 svc_getreqset(&readfds);
155 if (forked && pid != getpid())
156 exit(0);
157 }
158 }
159 }
160
reaper(int sig)161 static void reaper(int sig)
162 {
163 int status;
164 int saved_errno;
165
166 saved_errno = errno;
167
168 if (sig == SIGHUP) {
169 load_securenets();
170 errno = saved_errno;
171 return;
172 }
173
174 if (sig == SIGCHLD) {
175 while (wait3(&status, WNOHANG, NULL) > 0)
176 children--;
177 } else {
178 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
179 exit(0);
180 }
181
182 errno = saved_errno;
183 return;
184 }
185
186 void
usage(void)187 usage(void)
188 {
189 fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
190 exit(0);
191 }
192
193 int
main(int argc,char * argv[])194 main(int argc, char *argv[])
195 {
196 register SVCXPRT *transp = NULL;
197 int sock;
198 int proto = 0;
199 struct sockaddr_in saddr;
200 int asize = sizeof (saddr);
201 int ch;
202
203 while ((ch = getopt(argc, argv, "p:h")) != -1) {
204 switch (ch) {
205 case 'p':
206 yp_dir = optarg;
207 break;
208 default:
209 usage();
210 break;
211 }
212 }
213
214 load_securenets();
215
216 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
217 int ssize = sizeof (int);
218
219 if (saddr.sin_family != AF_INET)
220 exit(1);
221 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
222 (char *)&_rpcfdtype, &ssize) == -1)
223 exit(1);
224 sock = 0;
225 _rpcpmstart = 1;
226 proto = 0;
227 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
228 } else {
229 #ifndef RPC_SVC_FG
230 int size;
231 int pid, i;
232
233 pid = fork();
234 if (pid < 0)
235 err(1, "fork");
236 if (pid)
237 exit(0);
238 size = getdtablesize();
239 for (i = 0; i < size; i++)
240 (void) close(i);
241 i = open(_PATH_CONSOLE, 2);
242 (void) dup2(i, 1);
243 (void) dup2(i, 2);
244 i = open(_PATH_TTY, 2);
245 if (i >= 0) {
246 (void) ioctl(i, TIOCNOTTY, (char *)NULL);
247 (void) close(i);
248 }
249 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
250 #endif
251 sock = RPC_ANYSOCK;
252 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
253 }
254
255 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
256 transp = svcudp_create(sock);
257 if (transp == NULL) {
258 _msgout("cannot create udp service.");
259 exit(1);
260 }
261 if (!_rpcpmstart)
262 proto = IPPROTO_UDP;
263 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
264 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
265 exit(1);
266 }
267 }
268
269 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
270 transp = svctcp_create(sock, 0, 0);
271 if (transp == NULL) {
272 _msgout("cannot create tcp service.");
273 exit(1);
274 }
275 if (!_rpcpmstart)
276 proto = IPPROTO_TCP;
277 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
278 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
279 exit(1);
280 }
281 }
282
283 if (transp == (SVCXPRT *)NULL) {
284 _msgout("could not create a handle");
285 exit(1);
286 }
287 if (_rpcpmstart) {
288 (void) signal(SIGALRM, (SIG_PF) closedown);
289 (void) alarm(_RPCSVC_CLOSEDOWN/2);
290 }
291
292 (void) signal(SIGPIPE, SIG_IGN);
293 (void) signal(SIGCHLD, (SIG_PF) reaper);
294 (void) signal(SIGTERM, (SIG_PF) reaper);
295 (void) signal(SIGINT, (SIG_PF) reaper);
296 (void) signal(SIGHUP, (SIG_PF) reaper);
297
298 ypxfrd_svc_run();
299 _msgout("svc_run returned");
300 exit(1);
301 /* NOTREACHED */
302 }
303