1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29
30 /*
31 * This is a proxy daemon for the real Java slpd. This deamon starts
32 * at boot time, and listens for any incoming SLP messages only on
33 * loopback -- this way, only local processes can start the real
34 * daemon. When a message comes in, the proxy daemon dups the message
35 * fds onto fds 0, 1, and 2, and execs the real Java slpd. The purpose
36 * of this approach is for performance: boot time performance is
37 * not degraded by cranking off the (huge) JVM, and systems take
38 * the JVM resource hit only if they actually use SLP.
39 */
40
41 #include <stdio.h>
42 #include <sys/types.h>
43 #include <sys/socket.h>
44 #include <string.h>
45 #include <errno.h>
46 #include <sys/byteorder.h>
47 #include <sys/resource.h>
48 #include <netinet/in.h>
49 #include <unistd.h>
50 #include <slp.h>
51 #include <fcntl.h>
52 #include <stdlib.h>
53 #include <syslog.h>
54
55 /* This is an index which points into the args array at the conf file arg */
56 #define CONF_INDEX 6
57
58 /* Location of the Java Virtual Machine */
59 #define JAVA_VM "/usr/java/jre/bin/java"
60
61 static char *slpd_args[] = {
62 JAVA_VM,
63 "-Xmx128m",
64 "-classpath",
65 "/usr/share/lib/slp/slpd.jar",
66 "com.sun.slp.slpd",
67 "-f",
68 "/etc/inet/slp.conf",
69 0
70 };
71
72 /*
73 * These are global so they can be easily accessed from a signal
74 * handler for cleanup.
75 */
76
77 static void
run_slpd(void)78 run_slpd(void)
79 {
80 closelog();
81
82 if (execv(*slpd_args, slpd_args) == -1) {
83 openlog("slpd", LOG_PID, LOG_DAEMON);
84 syslog(LOG_ERR, "execv failed: %s", strerror(errno));
85 closelog();
86 }
87 }
88
89 /*
90 * If an alternate config file was specified with -f, make sure slpd
91 * uses that config file. Also, force libslp.so to use that new config
92 * file when checking to see if slpd is a DA. If any other arguments
93 * are given, they are ignored.
94 */
95 static void
do_args(int argc,char * const * argv)96 do_args(int argc, char *const *argv)
97 {
98 int c;
99 char *conf = NULL;
100
101 while ((c = getopt(argc, argv, "f:")) != EOF)
102 switch (c) {
103 case 'f':
104 conf = optarg;
105 break;
106 default:
107 break;
108 }
109
110 if (conf != NULL) {
111 char *prefix = "SLP_CONF_FILE=";
112 int env_size;
113 char *conf_env;
114
115 env_size = strlen(prefix) + strlen(conf) + 1;
116 if ((conf_env = malloc(env_size)) == NULL) {
117 syslog(LOG_ERR, "no memory");
118 exit(1);
119 }
120 (void) strlcpy(conf_env, prefix, env_size);
121 (void) strlcat(conf_env, conf, env_size);
122
123 (void) putenv(conf_env);
124
125 slpd_args[CONF_INDEX] = conf;
126 }
127 }
128
129 static void
detachfromtty(void)130 detachfromtty(void) {
131 switch (fork()) {
132 case -1:
133 perror("slpd: can not fork");
134 exit(1);
135 /*NOTREACHED*/
136 case 0:
137 break;
138 default:
139 exit(0);
140 }
141
142 /*
143 * Close existing file descriptors, open "/dev/null" as
144 * standard input, output, and error, and detach from
145 * controlling terminal.
146 */
147 closefrom(0);
148 (void) open("/dev/null", O_RDONLY);
149 (void) open("/dev/null", O_WRONLY);
150 (void) dup(1);
151 (void) setsid();
152 }
153
154 static void
cleanup_and_exit(int retval)155 cleanup_and_exit(int retval)
156 {
157 closelog();
158 exit(retval);
159 }
160
161 int
main(int argc,char * const * argv)162 main(int argc, char *const *argv)
163 {
164 struct sockaddr_in bindaddr;
165 socklen_t addrlen;
166 const char *isDA;
167 const char *proxyReg;
168 int connfd;
169 int lfd;
170 const int on = 1;
171
172 detachfromtty();
173
174 openlog("slpd", LOG_PID, LOG_DAEMON);
175
176 do_args(argc, argv);
177
178 /* If slpd has been configured to run as a DA, start it and exit */
179 isDA = SLPGetProperty("net.slp.isDA");
180 proxyReg = SLPGetProperty("net.slp.serializedRegURL");
181 if ((isDA && (strcasecmp(isDA, "true") == 0)) || proxyReg) {
182 run_slpd();
183 return (1);
184 }
185
186 if ((lfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
187 syslog(LOG_ERR, "socket failed: %s", strerror(errno));
188 cleanup_and_exit(1);
189 }
190
191 (void) setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on));
192
193 (void) memset((void *)&bindaddr, 0, sizeof (bindaddr));
194 bindaddr.sin_family = AF_INET;
195 bindaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
196 bindaddr.sin_port = htons(427);
197
198 if (bind(lfd, (const struct sockaddr *)&bindaddr, sizeof (bindaddr))
199 < 0) {
200 syslog(LOG_ERR, "bind failed: %s", strerror(errno));
201 cleanup_and_exit(1);
202 }
203
204 if (listen(lfd, 1) < 0) {
205 syslog(LOG_ERR, "listen failed: %s", strerror(errno));
206 cleanup_and_exit(1);
207 }
208
209 addrlen = sizeof (bindaddr);
210 if ((connfd = accept(lfd, (struct sockaddr *)&bindaddr, &addrlen))
211 < 0) {
212 syslog(LOG_ERR, "accept failed: %s", strerror(errno));
213 cleanup_and_exit(1);
214 }
215
216 (void) close(lfd);
217
218 (void) dup2(connfd, 0);
219 (void) close(connfd);
220 (void) dup2(0, 1);
221 (void) dup2(0, 2);
222
223 run_slpd();
224
225 return (1);
226 }
227