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
45extern void rstat_service(struct svc_req *, SVCXPRT *);
46
47void my_svc_run(void);
48
49int from_inetd = 1;	/* started from inetd ? */
50int closedown = 20;	/* how long to wait before going dormant */
51
52volatile sig_atomic_t gotsig;
53
54static void
55getsig(int signo)
56{
57	gotsig = 1;
58}
59
60
61int
62main(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
138void
139my_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