1 /* $NetBSD: rwall.c,v 1.17 2008/07/21 14:19:25 lukem Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1990 Regents of the University of California.
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1993 Christopher G. Demetriou
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. All advertising materials mentioning features or use of this software
44 * must display the following acknowledgement:
45 * This product includes software developed by the University of
46 * California, Berkeley and its contributors.
47 * 4. Neither the name of the University nor the names of its contributors
48 * may be used to endorse or promote products derived from this software
49 * without specific prior written permission.
50 *
51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * SUCH DAMAGE.
62 */
63
64 #include <sys/cdefs.h>
65 #ifndef lint
66 __COPYRIGHT("@(#) Copyright (c) 1988\
67 Regents of the University of California. All rights reserved.");
68 #endif /* not lint */
69
70 #ifndef lint
71 #if 0
72 static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";
73 #else
74 __RCSID("$NetBSD: rwall.c,v 1.17 2008/07/21 14:19:25 lukem Exp $");
75 #endif
76 #endif /* not lint */
77
78 /*
79 * This program is not related to David Wall, whose Stanford Ph.D. thesis
80 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
81 */
82 #include <sys/types.h>
83 #include <sys/param.h>
84 #include <sys/stat.h>
85 #include <err.h>
86 #include <paths.h>
87 #include <pwd.h>
88 #include <stdio.h>
89 #include <stdlib.h>
90 #include <string.h>
91 #include <time.h>
92 #include <unistd.h>
93
94 #include <rpc/rpc.h>
95 #include <rpcsvc/rwall.h>
96
97 static struct timeval timeout = { 25, 0 };
98
99 static char *makemsg(const char *);
100
101 int
main(int argc,char ** argv)102 main(int argc, char **argv)
103 {
104 char *wallhost, res;
105 CLIENT *cl;
106 char *mbuf;
107
108 setprogname(*argv);
109
110 if ((argc < 2) || (argc > 3)) {
111 (void)fprintf(stderr,
112 "Usage: %s hostname <file>\n", getprogname());
113 return 1;
114 }
115
116 wallhost = argv[1];
117
118 /*
119 * Create client "handle" used for calling MESSAGEPROG on the
120 * server designated on the command line. We tell the rpc package
121 * to use the "tcp" protocol when contacting the server.
122 */
123 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
124 if (cl == NULL) {
125 /*
126 * Couldn't establish connection with server.
127 * Print error message and die.
128 */
129 clnt_pcreateerror(wallhost);
130 return 1;
131 }
132
133 mbuf = makemsg(argv[2]);
134
135 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, (void *)&mbuf,
136 xdr_void, &res, timeout) != RPC_SUCCESS) {
137 free(mbuf);
138 /*
139 * An error occurred while calling the server.
140 * Print error message and die.
141 */
142 clnt_perror(cl, wallhost);
143 return 1;
144 }
145 free(mbuf);
146 return 0;
147 }
148
149 static char *
makemsg(const char * fname)150 makemsg(const char *fname)
151 {
152 struct tm *lt;
153 struct passwd *pw;
154 struct stat sbuf;
155 time_t now;
156 size_t mbufsize;
157 char *mbuf;
158 FILE *fp;
159 int fd;
160 const char *whom;
161 const char *tty;
162 char tmpname[MAXPATHLEN], lbuf[BUFSIZ], hostname[MAXHOSTNAMELEN + 1];
163
164 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
165 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL)
166 err(1, "Can't open temporary file");
167 (void)unlink(tmpname);
168
169 if (!(whom = getlogin()))
170 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
171 (void)gethostname(hostname, sizeof(hostname));
172 hostname[sizeof(hostname) - 1] = '\0';
173 (void)time(&now);
174 lt = localtime(&now);
175
176 /*
177 * all this stuff is to blank out a square for the message;
178 * we wrap message lines at column 79, not 80, because some
179 * terminals wrap after 79, some do not, and we can't tell.
180 * Which means that we may leave a non-blank character
181 * in column 80, but that can't be helped.
182 */
183 (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
184 whom, hostname);
185 tty = ttyname(STDERR_FILENO);
186 if (tty == NULL)
187 tty = "??";
188 (void)fprintf(fp, " (%s) at %d:%02d ...\n", tty, lt->tm_hour,
189 lt->tm_min);
190
191 (void)putc('\n', fp);
192
193 if (fname && !(freopen(fname, "r", stdin)))
194 err(1, "Can't open `%s'", fname);
195 while (fgets(lbuf, sizeof(lbuf), stdin))
196 (void)fputs(lbuf, fp);
197 rewind(fp);
198
199 if (fstat(fd, &sbuf) == -1)
200 err(1, "Can't stat temporary file.");
201 mbufsize = (size_t)sbuf.st_size;
202 if (!(mbuf = malloc((u_int)mbufsize)))
203 err(1, "malloc");
204 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
205 err(1, "Can't read temporary file.");
206 (void)close(fd);
207 return mbuf;
208 }
209