Initial import from FreeBSD RELENG_4:
[dragonfly.git] / usr.bin / rwall / rwall.c
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1993 Christopher G. Demetriou
3 * Copyright (c) 1988, 1990 Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#ifndef lint
36static const char copyright[] =
37"@(#) Copyright (c) 1988 Regents of the University of California.\n\
38 All rights reserved.\n";
39#endif /* not lint */
40
41#ifndef lint
42#if 0
43static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";
44#endif
45static const char rcsid[] =
46 "$FreeBSD: src/usr.bin/rwall/rwall.c,v 1.8.2.1 2001/02/18 02:27:54 kris Exp $";
47#endif /* not lint */
48
49/*
50 * This program is not related to David Wall, whose Stanford Ph.D. thesis
51 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
52 */
53
54#include <sys/param.h>
55#include <sys/stat.h>
56#include <sys/time.h>
57#include <sys/uio.h>
58#include <err.h>
59#include <paths.h>
60#include <pwd.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <string.h>
64#include <time.h>
65#include <unistd.h>
66#include <utmp.h>
67
68#include <rpc/rpc.h>
69#include <rpcsvc/rwall.h>
70
71int mbufsize;
72char *mbuf;
73
74void makemsg __P((char *));
75static void usage __P((void));
76char *ttymsg __P((struct iovec *, int, char *, int));
77
78/* ARGSUSED */
79int
80main(argc, argv)
81 int argc;
82 char **argv;
83{
84 char *wallhost, res;
85 CLIENT *cl;
86 struct timeval tv;
87
88 if ((argc < 2) || (argc > 3))
89 usage();
90
91 wallhost = argv[1];
92
93 makemsg(argv[2]);
94
95 /*
96 * Create client "handle" used for calling MESSAGEPROG on the
97 * server designated on the command line. We tell the rpc package
98 * to use the "tcp" protocol when contacting the server.
99 */
100 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
101 if (cl == NULL) {
102 /*
103 * Couldn't establish connection with server.
104 * Print error message and die.
105 */
106 errx(1, "%s", clnt_spcreateerror(wallhost));
107 }
108
109 tv.tv_sec = 15; /* XXX ?? */
110 tv.tv_usec = 0;
111 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, tv) != RPC_SUCCESS) {
112 /*
113 * An error occurred while calling the server.
114 * Print error message and die.
115 */
116 errx(1, "%s", clnt_sperror(cl, wallhost));
117 }
118
119 exit(0);
120}
121
122static void
123usage()
124{
125 (void)fprintf(stderr, "usage: rwall hostname [file]\n");
126 exit(1);
127}
128
129void
130makemsg(fname)
131 char *fname;
132{
133 struct tm *lt;
134 struct passwd *pw;
135 struct stat sbuf;
136 time_t now;
137 FILE *fp;
138 int fd;
139 char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64];
140 const char *whom;
141
142 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
143 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
144 err(1, "can't open temporary file");
145 (void)unlink(tmpname);
146
147 if (!(whom = getlogin()))
148 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
149 (void)gethostname(hostname, sizeof(hostname));
150 (void)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 (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
161 whom, hostname);
162 tty = ttyname(STDERR_FILENO);
163 if (tty == NULL)
164 tty = "no tty";
165 (void)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 = sbuf.st_size;
179 if (!(mbuf = malloc((u_int)mbufsize)))
180 err(1, "out of memory");
181 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
182 err(1, "can't read temporary file");
183 (void)close(fd);
184}