1 /* $OpenBSD: rstatd.c,v 1.21 2005/09/16 23:50:33 deraadt Exp $ */
2
3 /*-
4 * Copyright (c) 1993, John Brezak
5 * 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. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifndef lint
32 static char rcsid[] = "$OpenBSD: rstatd.c,v 1.21 2005/09/16 23:50:33 deraadt Exp $";
33 #endif /* not lint */
34
35 #include <sys/types.h>
36 #include <sys/socket.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41 #include <signal.h>
42 #include <pwd.h>
43 #include <syslog.h>
44 #include <errno.h>
45 #include <stdlib.h>
46 #include <rpc/rpc.h>
47 #include <rpcsvc/rstat.h>
48
49 extern int __svc_fdsetsize;
50 extern fd_set *__svc_fdset;
51 extern void svc_getreqset2(fd_set *, int);
52 extern void rstat_service(struct svc_req *, SVCXPRT *);
53
54 void my_svc_run(void);
55
56 int from_inetd = 1; /* started from inetd ? */
57 int closedown = 20; /* how long to wait before going dormant */
58
59 volatile sig_atomic_t gotsig;
60
61 /* ARGSUSED */
62 static void
getsig(int signo)63 getsig(int signo)
64 {
65 gotsig = 1;
66 }
67
68
69 int
main(int argc,char * argv[])70 main(int argc, char *argv[])
71 {
72 int sock = 0, proto = 0;
73 socklen_t fromlen;
74 struct passwd *pw;
75 struct sockaddr_storage from;
76 SVCXPRT *transp;
77
78 openlog("rpc.rstatd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON);
79
80 pw = getpwnam("_rstatd");
81 if (!pw)
82 pw = getpwnam("nobody");
83 if (chroot("/var/empty") == -1) {
84 syslog(LOG_ERR, "cannot chdir to /var/empty.");
85 exit(1);
86 }
87 chdir("/");
88
89 if (pw) {
90 setgroups(1, &pw->pw_gid);
91 setegid(pw->pw_gid);
92 setgid(pw->pw_gid);
93 seteuid(pw->pw_uid);
94 setuid(pw->pw_uid);
95 }
96
97 if (argc == 2)
98 closedown = atoi(argv[1]);
99 if (closedown <= 0)
100 closedown = 20;
101
102 /*
103 * See if inetd started us
104 */
105 fromlen = sizeof(from);
106 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
107 from_inetd = 0;
108 sock = RPC_ANYSOCK;
109 proto = IPPROTO_UDP;
110 }
111
112 if (!from_inetd) {
113 daemon(0, 0);
114
115 (void)pmap_unset(RSTATPROG, RSTATVERS_TIME);
116 (void)pmap_unset(RSTATPROG, RSTATVERS_SWTCH);
117 (void)pmap_unset(RSTATPROG, RSTATVERS_ORIG);
118
119 (void) signal(SIGINT, getsig);
120 (void) signal(SIGTERM, getsig);
121 (void) signal(SIGHUP, getsig);
122 }
123
124 transp = svcudp_create(sock);
125 if (transp == NULL) {
126 syslog(LOG_ERR, "cannot create udp service.");
127 exit(1);
128 }
129 if (!svc_register(transp, RSTATPROG, RSTATVERS_TIME, rstat_service, proto)) {
130 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_TIME, udp).");
131 exit(1);
132 }
133 if (!svc_register(transp, RSTATPROG, RSTATVERS_SWTCH, rstat_service, proto)) {
134 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_SWTCH, udp).");
135 exit(1);
136 }
137 if (!svc_register(transp, RSTATPROG, RSTATVERS_ORIG, rstat_service, proto)) {
138 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_ORIG, udp).");
139 exit(1);
140 }
141
142 my_svc_run();
143 syslog(LOG_ERR, "svc_run returned");
144 exit(1);
145 }
146
147 void
my_svc_run(void)148 my_svc_run(void)
149 {
150 extern volatile sig_atomic_t wantupdatestat;
151 extern void updatestat(void);
152 struct pollfd *pfd = NULL, *newp;
153 int nready, saved_max_pollfd = 0;
154
155 for (;;) {
156 if (wantupdatestat) {
157 wantupdatestat = 0;
158 updatestat();
159 }
160 if (gotsig) {
161 (void) pmap_unset(RSTATPROG, RSTATVERS_TIME);
162 (void) pmap_unset(RSTATPROG, RSTATVERS_SWTCH);
163 (void) pmap_unset(RSTATPROG, RSTATVERS_ORIG);
164 exit(0);
165 }
166 if (svc_max_pollfd > saved_max_pollfd) {
167 newp = realloc(pfd, sizeof(*pfd) * svc_max_pollfd);
168 if (newp == NULL) {
169 free(pfd);
170 perror("svc_run: - realloc failed");
171 return;
172 }
173 pfd = newp;
174 saved_max_pollfd = svc_max_pollfd;
175 }
176 memcpy(pfd, svc_pollfd, sizeof(*pfd) * svc_max_pollfd);
177
178 nready = poll(pfd, svc_max_pollfd, INFTIM);
179 switch (nready) {
180 case -1:
181 if (errno == EINTR)
182 continue;
183 perror("svc_run: - poll failed");
184 free(pfd);
185 return;
186 case 0:
187 continue;
188 default:
189 svc_getreq_poll(pfd, nready);
190 }
191 }
192 }
193