Annotation of src/usr.bin/rwall/rwall.c, Revision 1.10
1.10 ! mickey 1: /* $OpenBSD: rwall.c,v 1.9 2003/07/02 00:21:16 avsm 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.
1.7 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #ifndef lint
34: char copyright[] =
35: "@(#) Copyright (c) 1988 Regents of the University of California.\n\
36: All rights reserved.\n";
37: #endif /* not lint */
38:
39: #ifndef lint
40: /*static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";*/
1.10 ! mickey 41: static char rcsid[] = "$OpenBSD: rwall.c,v 1.9 2003/07/02 00:21:16 avsm Exp $";
1.1 deraadt 42: #endif /* not lint */
43:
44: /*
45: * This program is not related to David Wall, whose Stanford Ph.D. thesis
46: * is entitled "Mechanisms for Broadcast and Selective Broadcast".
47: */
48:
49: #include <stdio.h>
50: #include <stdlib.h>
51: #include <string.h>
52: #include <time.h>
53: #include <sys/param.h>
54: #include <sys/types.h>
55: #include <sys/stat.h>
56: #include <pwd.h>
57: #include <unistd.h>
58: #include <paths.h>
1.10 ! mickey 59: #include <err.h>
1.1 deraadt 60:
61: #include <rpc/rpc.h>
62: #include <rpcsvc/rwall.h>
63:
64: struct timeval timeout = { 25, 0 };
65: int mbufsize;
66: char *mbuf;
67:
1.10 ! mickey 68: void makemsg(char *);
1.1 deraadt 69:
70: int
1.8 deraadt 71: main(int argc, char *argv[])
1.1 deraadt 72: {
1.10 ! mickey 73: extern char *__progname;
1.1 deraadt 74: char *wallhost, res;
75: CLIENT *cl;
76:
77: if ((argc < 2) || (argc > 3)) {
1.10 ! mickey 78: fprintf(stderr, "usage: %s hostname [file]\n", __progname);
1.1 deraadt 79: exit(1);
80: }
81:
82: wallhost = argv[1];
83:
84: makemsg(argv[2]);
85:
86: /*
87: * Create client "handle" used for calling MESSAGEPROG on the
88: * server designated on the command line. We tell the rpc package
89: * to use the "tcp" protocol when contacting the server.
90: */
91: cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
92: if (cl == NULL) {
93: /*
94: * Couldn't establish connection with server.
95: * Print error message and die.
96: */
97: clnt_pcreateerror(wallhost);
98: exit(1);
99: }
100:
1.10 ! mickey 101: if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void,
! 102: &res, timeout) != RPC_SUCCESS) {
1.1 deraadt 103: /*
1.10 ! mickey 104: * An error occurred while calling the server.
1.1 deraadt 105: * Print error message and die.
106: */
107: clnt_perror(cl, wallhost);
108: exit(1);
109: }
110:
111: exit(0);
112: }
113:
114: void
1.8 deraadt 115: makemsg(char *fname)
1.1 deraadt 116: {
117: struct tm *lt;
118: struct passwd *pw;
119: struct stat sbuf;
120: time_t now;
121: FILE *fp;
122: int fd;
1.6 deraadt 123: char *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN];
1.1 deraadt 124:
1.10 ! mickey 125: snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP);
! 126: if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
! 127: err(1, "can't open temporary file");
1.1 deraadt 128: (void)unlink(tmpname);
129:
130: if (!(whom = getlogin()))
131: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
132: (void)gethostname(hostname, sizeof(hostname));
133: (void)time(&now);
134: lt = localtime(&now);
135:
136: /*
137: * all this stuff is to blank out a square for the message;
138: * we wrap message lines at column 79, not 80, because some
139: * terminals wrap after 79, some do not, and we can't tell.
140: * Which means that we may leave a non-blank character
141: * in column 80, but that can't be helped.
142: */
143: (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
144: whom, hostname);
145: (void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2),
146: lt->tm_hour, lt->tm_min);
147:
148: putc('\n', fp);
149:
1.10 ! mickey 150: if (fname && !(freopen(fname, "r", stdin)))
! 151: err(1, "%s", fname);
1.1 deraadt 152: while (fgets(lbuf, sizeof(lbuf), stdin))
153: fputs(lbuf, fp);
154: rewind(fp);
155:
1.10 ! mickey 156: if (fstat(fd, &sbuf))
! 157: err(1, "can't stat temporary file");
1.1 deraadt 158: mbufsize = sbuf.st_size;
1.10 ! mickey 159: if (!(mbuf = malloc((u_int)mbufsize)))
! 160: err(1, "malloc");
! 161: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
! 162: err(1, "can't read temporary file");
1.1 deraadt 163: (void)close(fd);
164: }
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