1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1993 Christopher G. Demetriou
5 * Copyright (c) 1988, 1990 Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #ifndef lint
38 static const char copyright[] =
39 "@(#) Copyright (c) 1988 Regents of the University of California.\n\
40 All rights reserved.\n";
41 #endif /* not lint */
42
43 #ifndef lint
44 static const char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";
45 #endif
46
47 #include <sys/cdefs.h>
48 __FBSDID("$FreeBSD$");
49
50 /*
51 * This program is not related to David Wall, whose Stanford Ph.D. thesis
52 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
53 */
54
55 #include <sys/param.h>
56 #include <sys/stat.h>
57 #include <sys/uio.h>
58 #include <rpc/rpc.h>
59 #include <rpcsvc/rwall.h>
60 #include <err.h>
61 #include <paths.h>
62 #include <pwd.h>
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <time.h>
67 #include <unistd.h>
68
69 static char *mbuf;
70
71 static char notty[] = "no tty";
72
73 static void makemsg(const char *);
74 static void usage(void);
75
76 /* ARGSUSED */
77 int
main(int argc,char * argv[])78 main(int argc, char *argv[])
79 {
80 char *wallhost, res;
81 CLIENT *cl;
82 struct timeval tv;
83
84 if ((argc < 2) || (argc > 3))
85 usage();
86
87 wallhost = argv[1];
88
89 makemsg(argv[2]);
90
91 /*
92 * Create client "handle" used for calling MESSAGEPROG on the
93 * server designated on the command line. We tell the rpc package
94 * to use the "tcp" protocol when contacting the server.
95 */
96 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
97 if (cl == NULL) {
98 /*
99 * Couldn't establish connection with server.
100 * Print error message and die.
101 */
102 errx(1, "%s", clnt_spcreateerror(wallhost));
103 }
104
105 tv.tv_sec = 15; /* XXX ?? */
106 tv.tv_usec = 0;
107 if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf,
108 (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) {
109 /*
110 * An error occurred while calling the server.
111 * Print error message and die.
112 */
113 errx(1, "%s", clnt_sperror(cl, wallhost));
114 }
115
116 return (0);
117 }
118
119 static void
usage(void)120 usage(void)
121 {
122 fprintf(stderr, "usage: rwall host [file]\n");
123 exit(1);
124 }
125
126 static void
makemsg(const char * fname)127 makemsg(const char *fname)
128 {
129 struct tm *lt;
130 struct passwd *pw;
131 struct stat sbuf;
132 time_t now;
133 FILE *fp;
134 int fd;
135 size_t mbufsize;
136 char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64];
137 const char *whom;
138
139 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
140 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL)
141 err(1, "can't open temporary file");
142 unlink(tmpname);
143
144 whom = getlogin();
145 if (!whom) {
146 pw = getpwuid(getuid());
147 whom = pw ? pw->pw_name : "???";
148 }
149 gethostname(hostname, sizeof(hostname));
150 time(&now);
151 lt = localtime(&now);
152
153 /*
154 * all this stuff is to blank out a square for the message;
155 * we wrap message lines at column 79, not 80, because some
156 * terminals wrap after 79, some do not, and we can't tell.
157 * Which means that we may leave a non-blank character
158 * in column 80, but that can't be helped.
159 */
160 fprintf(fp, "Remote Broadcast Message from %s@%s\n",
161 whom, hostname);
162 tty = ttyname(STDERR_FILENO);
163 if (tty == NULL)
164 tty = notty;
165 fprintf(fp, " (%s) at %d:%02d ...\n", tty,
166 lt->tm_hour, lt->tm_min);
167
168 putc('\n', fp);
169
170 if (fname && !(freopen(fname, "r", stdin)))
171 err(1, "can't read %s", fname);
172 while (fgets(lbuf, sizeof(lbuf), stdin))
173 fputs(lbuf, fp);
174 rewind(fp);
175
176 if (fstat(fd, &sbuf))
177 err(1, "can't stat temporary file");
178 mbufsize = (size_t)sbuf.st_size;
179 mbuf = malloc(mbufsize);
180 if (mbuf == NULL)
181 err(1, "out of memory");
182 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize)
183 err(1, "can't read temporary file");
184 close(fd);
185 }
186