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- /*
- * Copyright (c) 1988, 1990 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- char copyright[] =
- "@(#) Copyright (c) 1988 Regents of the University of California.\n\
- All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)wall.c 5.14 (Berkeley) 3/2/91";
- #endif /* not lint */
-
- /*
- * This program is not related to David Wall, whose Stanford Ph.D. thesis
- * is entitled "Mechanisms for Broadcast and Selective Broadcast".
- */
-
- #include <sys/param.h>
- #include <sys/stat.h>
- #include <sys/time.h>
- #include <sys/uio.h>
- #include <utmp.h>
- #include <pwd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <paths.h>
-
- #define IGNOREUSER "sleeper"
-
- int nobanner;
- int mbufsize;
- char *mbuf;
-
- /* ARGSUSED */
- main(argc, argv)
- int argc;
- char **argv;
- {
- extern int optind;
- int ch;
- struct iovec iov;
- struct utmp utmp;
- FILE *fp;
- char *p, *ttymsg();
-
- while ((ch = getopt(argc, argv, "n")) != EOF)
- switch (ch) {
- case 'n':
- /* undoc option for shutdown: suppress banner */
- if (geteuid() == 0)
- nobanner = 1;
- break;
- case '?':
- default:
- usage:
- (void)fprintf(stderr, "usage: wall [file]\n");
- exit(1);
- }
- argc -= optind;
- argv += optind;
- if (argc > 1)
- goto usage;
-
- makemsg(*argv);
-
- if (!(fp = fopen(_PATH_UTMP, "r"))) {
- (void)fprintf(stderr, "wall: cannot read %s.\n", _PATH_UTMP);
- exit(1);
- }
- iov.iov_base = mbuf;
- iov.iov_len = mbufsize;
- /* NOSTRICT */
- while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
- if (!utmp.ut_name[0] ||
- !strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name)))
- continue;
- if (p = ttymsg(&iov, 1, utmp.ut_line))
- (void)fprintf(stderr, "wall: %s\n", p);
- }
- exit(0);
- }
-
- makemsg(fname)
- char *fname;
- {
- register int ch, cnt;
- struct tm *lt;
- struct passwd *pw;
- struct stat sbuf;
- time_t now, time();
- FILE *fp;
- int fd;
- char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[15];
- char *getlogin(), *strcpy(), *ttyname();
-
- (void)strcpy(tmpname, _PATH_TMP);
- (void)strcat(tmpname, "/wall.XXXXXX");
- if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) {
- (void)fprintf(stderr, "wall: can't open temporary file.\n");
- exit(1);
- }
- (void)unlink(tmpname);
-
- if (!nobanner) {
- if (!(whom = getlogin()))
- whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
- (void)gethostname(hostname, sizeof(hostname));
- (void)time(&now);
- lt = localtime(&now);
-
- /*
- * all this stuff is to blank out a square for the message;
- * we wrap message lines at column 79, not 80, because some
- * terminals wrap after 79, some do not, and we can't tell.
- * Which means that we may leave a non-blank character
- * in column 80, but that can't be helped.
- */
- (void)fprintf(fp, "\r%79s\r\n", " ");
- (void)sprintf(lbuf, "Broadcast Message from %s@%s",
- whom, hostname);
- (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
- (void)sprintf(lbuf, " (%s) at %d:%02d ...", ttyname(2),
- lt->tm_hour, lt->tm_min);
- (void)fprintf(fp, "%-79.79s\r\n", lbuf);
- }
- (void)fprintf(fp, "%79s\r\n", " ");
-
- if (*fname && !(freopen(fname, "r", stdin))) {
- (void)fprintf(stderr, "wall: can't read %s.\n", fname);
- exit(1);
- }
- while (fgets(lbuf, sizeof(lbuf), stdin))
- for (cnt = 0, p = lbuf; ch = *p; ++p, ++cnt) {
- if (cnt == 79 || ch == '\n') {
- for (; cnt < 79; ++cnt)
- putc(' ', fp);
- putc('\r', fp);
- putc('\n', fp);
- cnt = 0;
- } else
- putc(ch, fp);
- }
- (void)fprintf(fp, "%79s\r\n", " ");
- rewind(fp);
-
- if (fstat(fd, &sbuf)) {
- (void)fprintf(stderr, "wall: can't stat temporary file.\n");
- exit(1);
- }
- mbufsize = sbuf.st_size;
- if (!(mbuf = malloc((u_int)mbufsize))) {
- (void)fprintf(stderr, "wall: out of memory.\n");
- exit(1);
- }
- if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) {
- (void)fprintf(stderr, "wall: can't read temporary file.\n");
- exit(1);
- }
- (void)close(fd);
- }
-