Annotation of src/usr.bin/rwall/rwall.c, Revision 1.6
1.6 ! deraadt 1: /* $OpenBSD: rwall.c,v 1.5 1999/05/30 08:21:15 deraadt Exp $ */
1.2 deraadt 2:
1.1 deraadt 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: 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 char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";*/
1.6 ! deraadt 45: static char rcsid[] = "$OpenBSD: rwall.c,v 1.5 1999/05/30 08:21:15 deraadt Exp $";
1.1 deraadt 46: #endif /* not lint */
47:
48: /*
49: * This program is not related to David Wall, whose Stanford Ph.D. thesis
50: * is entitled "Mechanisms for Broadcast and Selective Broadcast".
51: */
52:
53: #include <stdio.h>
54: #include <stdlib.h>
55: #include <string.h>
56: #include <time.h>
57: #include <sys/param.h>
58: #include <sys/types.h>
59: #include <sys/stat.h>
60: #include <pwd.h>
61: #include <unistd.h>
62: #include <paths.h>
63:
64: #include <rpc/rpc.h>
65: #include <rpcsvc/rwall.h>
66:
67: struct timeval timeout = { 25, 0 };
68: int mbufsize;
69: char *mbuf;
70:
71: void makemsg ();
72:
73: int
74: main(argc, argv)
75: int argc;
76: char **argv;
77: {
78: char *wallhost, res;
79: CLIENT *cl;
80:
81: if ((argc < 2) || (argc > 3)) {
82: fprintf(stderr, "usage: %s hostname [file]\n", argv[0]);
83: exit(1);
84: }
85:
86: wallhost = argv[1];
87:
88: makemsg(argv[2]);
89:
90: /*
91: * Create client "handle" used for calling MESSAGEPROG on the
92: * server designated on the command line. We tell the rpc package
93: * to use the "tcp" protocol when contacting the server.
94: */
95: cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
96: if (cl == NULL) {
97: /*
98: * Couldn't establish connection with server.
99: * Print error message and die.
100: */
101: clnt_pcreateerror(wallhost);
102: exit(1);
103: }
104:
105: if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, timeout) != RPC_SUCCESS) {
106: /*
107: * An error occurred while calling the server.
108: * Print error message and die.
109: */
110: clnt_perror(cl, wallhost);
111: exit(1);
112: }
113:
114: exit(0);
115: }
116:
117: void
118: makemsg(fname)
119: char *fname;
120: {
121: struct tm *lt;
122: struct passwd *pw;
123: struct stat sbuf;
124: time_t now;
125: FILE *fp;
126: int fd;
1.6 ! deraadt 127: char *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN];
1.1 deraadt 128:
1.4 deraadt 129: snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
1.5 deraadt 130: if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) {
1.1 deraadt 131: (void)fprintf(stderr, "wall: can't open temporary file.\n");
132: exit(1);
133: }
134: (void)unlink(tmpname);
135:
136: if (!(whom = getlogin()))
137: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
138: (void)gethostname(hostname, sizeof(hostname));
139: (void)time(&now);
140: lt = localtime(&now);
141:
142: /*
143: * all this stuff is to blank out a square for the message;
144: * we wrap message lines at column 79, not 80, because some
145: * terminals wrap after 79, some do not, and we can't tell.
146: * Which means that we may leave a non-blank character
147: * in column 80, but that can't be helped.
148: */
149: (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
150: whom, hostname);
151: (void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2),
152: lt->tm_hour, lt->tm_min);
153:
154: putc('\n', fp);
155:
156: if (fname && !(freopen(fname, "r", stdin))) {
157: (void)fprintf(stderr, "wall: can't read %s.\n", fname);
158: exit(1);
159: }
160: while (fgets(lbuf, sizeof(lbuf), stdin))
161: fputs(lbuf, fp);
162: rewind(fp);
163:
164: if (fstat(fd, &sbuf)) {
165: (void)fprintf(stderr, "wall: can't stat temporary file.\n");
166: exit(1);
167: }
168: mbufsize = sbuf.st_size;
169: if (!(mbuf = malloc((u_int)mbufsize))) {
170: (void)fprintf(stderr, "wall: out of memory.\n");
171: exit(1);
172: }
173: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) {
174: (void)fprintf(stderr, "wall: can't read temporary file.\n");
175: exit(1);
176: }
177: (void)close(fd);
178: }
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