1 /* $NetBSD: rwalld.c,v 1.23 2011/09/16 16:13:17 plunky Exp $ */
2
3 /*
4 * Copyright (c) 1993 Christopher G. Demetriou
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed for the
18 * NetBSD Project. See http://www.NetBSD.org/ for
19 * information about NetBSD.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
35 */
36
37 #include <sys/cdefs.h>
38 #ifndef lint
39 __RCSID("$NetBSD: rwalld.c,v 1.23 2011/09/16 16:13:17 plunky Exp $");
40 #endif /* not lint */
41
42 #include <unistd.h>
43 #include <stdlib.h>
44 #include <sys/types.h>
45 #include <pwd.h>
46 #include <stdio.h>
47 #include <string.h>
48 #include <syslog.h>
49 #include <errno.h>
50 #include <sys/socket.h>
51 #include <signal.h>
52 #include <sys/wait.h>
53 #include <rpc/rpc.h>
54 #include <rpcsvc/rwall.h>
55
56 #ifdef OSF
57 #define WALL_CMD "/usr/sbin/wall"
58 #else
59 #define WALL_CMD "/usr/bin/wall -n"
60 #endif
61
62 static int from_inetd = 1;
63
64 static void cleanup(int);
65 static void wallprog_1(struct svc_req *, SVCXPRT *);
66
67 __dead static void
cleanup(int n)68 cleanup(int n)
69 {
70
71 (void)rpcb_unset(WALLPROG, WALLVERS, NULL);
72 exit(0);
73 }
74
75 int
main(int argc,char * argv[])76 main(int argc, char *argv[])
77 {
78 SVCXPRT *transp;
79 struct sockaddr_storage from;
80 socklen_t fromlen;
81
82 if (geteuid() == 0) {
83 struct passwd *pep = getpwnam("nobody");
84 if (pep)
85 setuid(pep->pw_uid);
86 else
87 setuid(getuid());
88 }
89
90 /*
91 * See if inetd started us
92 */
93 fromlen = sizeof(from);
94 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
95 from_inetd = 0;
96
97 if (!from_inetd) {
98 daemon(0, 0);
99
100 (void) rpcb_unset(WALLPROG, WALLVERS, NULL);
101
102 (void) signal(SIGINT, cleanup);
103 (void) signal(SIGTERM, cleanup);
104 (void) signal(SIGHUP, cleanup);
105 }
106
107 openlog("rpc.rwalld", LOG_PID, LOG_DAEMON);
108
109 if (from_inetd) {
110 transp = svc_dg_create(0, 0, 0);
111 if (transp == NULL) {
112 syslog(LOG_ERR, "cannot create udp service.");
113 exit(1);
114 }
115 if (!svc_reg(transp, WALLPROG, WALLVERS, wallprog_1, NULL)) {
116 syslog(LOG_ERR, "unable to register "
117 "(WALLPROG, WALLVERS).");
118 exit(1);
119 }
120 } else {
121 if (!svc_create(wallprog_1, WALLPROG, WALLVERS, "udp")) {
122 syslog(LOG_ERR, "unable to create "
123 "(WALLPROG, WALLVERS.)");
124 exit(1);
125 }
126 }
127
128 svc_run();
129 syslog(LOG_ERR, "svc_run returned");
130 exit(1);
131
132 }
133
134 void *
wallproc_wall_1_svc(char ** s,struct svc_req * rqstp)135 wallproc_wall_1_svc(char **s, struct svc_req *rqstp)
136 {
137 FILE *pfp;
138
139 pfp = popen(WALL_CMD, "w");
140 if (pfp != NULL) {
141 fprintf(pfp, "\007\007%s", *s);
142 pclose(pfp);
143 }
144
145 return (*s);
146 }
147
148 static void
wallprog_1(struct svc_req * rqstp,SVCXPRT * transp)149 wallprog_1(struct svc_req *rqstp, SVCXPRT *transp)
150 {
151 union {
152 char *wallproc_wall_1_arg;
153 } argument;
154 char *result;
155 xdrproc_t xdr_argument, xdr_result;
156 char *(*local) __P((char **, struct svc_req *));
157
158 switch (rqstp->rq_proc) {
159 case NULLPROC:
160 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
161 goto leave;
162
163 case WALLPROC_WALL:
164 xdr_argument = (xdrproc_t)xdr_wrapstring;
165 xdr_result = (xdrproc_t)xdr_void;
166 local = (char *(*) __P((char **, struct svc_req *)))
167 wallproc_wall_1_svc;
168 break;
169
170 default:
171 svcerr_noproc(transp);
172 goto leave;
173 }
174 memset((char *)&argument, 0, sizeof(argument));
175 if (!svc_getargs(transp, xdr_argument, (caddr_t)&argument)) {
176 svcerr_decode(transp);
177 goto leave;
178 }
179 result = (*local)((char **)&argument, rqstp);
180 if (result != NULL && !svc_sendreply(transp, xdr_result, result)) {
181 svcerr_systemerr(transp);
182 }
183 if (!svc_freeargs(transp, xdr_argument, (caddr_t)&argument)) {
184 syslog(LOG_ERR, "unable to free arguments");
185 exit(1);
186 }
187 leave:
188 if (from_inetd)
189 exit(0);
190 }
191