1 /* $OpenBSD: rstatd.c,v 1.31 2023/03/08 04:43:05 guenther 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 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <signal.h>
39 #include <pwd.h>
40 #include <syslog.h>
41 #include <errno.h>
42 #include <rpc/rpc.h>
43 #include <rpcsvc/rstat.h>
44
45 extern void rstat_service(struct svc_req *, SVCXPRT *);
46
47 void my_svc_run(void);
48
49 int from_inetd = 1; /* started from inetd ? */
50 int closedown = 20; /* how long to wait before going dormant */
51
52 volatile sig_atomic_t gotsig;
53
54 static void
getsig(int signo)55 getsig(int signo)
56 {
57 gotsig = 1;
58 }
59
60
61 int
main(int argc,char * argv[])62 main(int argc, char *argv[])
63 {
64 int sock = 0, proto = 0;
65 socklen_t fromlen;
66 struct passwd *pw;
67 struct sockaddr_storage from;
68 SVCXPRT *transp;
69
70 openlog("rpc.rstatd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON);
71
72 if ((pw = getpwnam("_rstatd")) == NULL) {
73 syslog(LOG_ERR, "no such user _rstatd");
74 exit(1);
75 }
76 if (chroot("/var/empty") == -1) {
77 syslog(LOG_ERR, "cannot chdir to /var/empty.");
78 exit(1);
79 }
80 chdir("/");
81
82 setgroups(1, &pw->pw_gid);
83 setegid(pw->pw_gid);
84 setgid(pw->pw_gid);
85 seteuid(pw->pw_uid);
86 setuid(pw->pw_uid);
87
88 if (argc == 2)
89 closedown = strtonum(argv[1], 1, INT_MAX, NULL);
90 if (closedown == 0)
91 closedown = 20;
92
93 /*
94 * See if inetd started us
95 */
96 fromlen = sizeof(from);
97 if (getsockname(0, (struct sockaddr *)&from, &fromlen) == -1) {
98 from_inetd = 0;
99 sock = RPC_ANYSOCK;
100 proto = IPPROTO_UDP;
101 }
102
103 if (!from_inetd) {
104 daemon(0, 0);
105
106 (void)pmap_unset(RSTATPROG, RSTATVERS_TIME);
107 (void)pmap_unset(RSTATPROG, RSTATVERS_SWTCH);
108 (void)pmap_unset(RSTATPROG, RSTATVERS_ORIG);
109
110 (void) signal(SIGINT, getsig);
111 (void) signal(SIGTERM, getsig);
112 (void) signal(SIGHUP, getsig);
113 }
114
115 transp = svcudp_create(sock);
116 if (transp == NULL) {
117 syslog(LOG_ERR, "cannot create udp service.");
118 exit(1);
119 }
120 if (!svc_register(transp, RSTATPROG, RSTATVERS_TIME, rstat_service, proto)) {
121 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_TIME, udp).");
122 exit(1);
123 }
124 if (!svc_register(transp, RSTATPROG, RSTATVERS_SWTCH, rstat_service, proto)) {
125 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_SWTCH, udp).");
126 exit(1);
127 }
128 if (!svc_register(transp, RSTATPROG, RSTATVERS_ORIG, rstat_service, proto)) {
129 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_ORIG, udp).");
130 exit(1);
131 }
132
133 my_svc_run();
134 syslog(LOG_ERR, "svc_run returned");
135 exit(1);
136 }
137
138 void
my_svc_run(void)139 my_svc_run(void)
140 {
141 extern volatile sig_atomic_t wantupdatestat;
142 extern void updatestat(void);
143 struct pollfd *pfd = NULL, *newp;
144 int nready, saved_max_pollfd = 0;
145
146 for (;;) {
147 if (wantupdatestat) {
148 wantupdatestat = 0;
149 updatestat();
150 }
151 if (gotsig) {
152 (void) pmap_unset(RSTATPROG, RSTATVERS_TIME);
153 (void) pmap_unset(RSTATPROG, RSTATVERS_SWTCH);
154 (void) pmap_unset(RSTATPROG, RSTATVERS_ORIG);
155 exit(0);
156 }
157 if (svc_max_pollfd > saved_max_pollfd) {
158 newp = reallocarray(pfd, svc_max_pollfd, sizeof(*pfd));
159 if (newp == NULL) {
160 free(pfd);
161 perror("svc_run: - realloc failed");
162 return;
163 }
164 pfd = newp;
165 saved_max_pollfd = svc_max_pollfd;
166 }
167 memcpy(pfd, svc_pollfd, svc_max_pollfd * sizeof(*pfd));
168
169 nready = poll(pfd, svc_max_pollfd, INFTIM);
170 switch (nready) {
171 case -1:
172 if (errno == EINTR)
173 continue;
174 perror("svc_run: - poll failed");
175 free(pfd);
176 return;
177 case 0:
178 continue;
179 default:
180 svc_getreq_poll(pfd, nready);
181 }
182 }
183 }
184