diff options
Diffstat (limited to 'usr.bin/wall/wall.c')
-rw-r--r-- | usr.bin/wall/wall.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/usr.bin/wall/wall.c b/usr.bin/wall/wall.c new file mode 100644 index 0000000..9b120ed --- /dev/null +++ b/usr.bin/wall/wall.c @@ -0,0 +1,201 @@ +/* + * Copyright (c) 1988, 1990, 1993 + * The 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 +static char copyright[] = +"@(#) Copyright (c) 1988, 1990, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93"; +#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 <paths.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <utmp.h> + +void makemsg __P((char *)); + +#define IGNOREUSER "sleeper" + +int nobanner; +int mbufsize; +char *mbuf; + +/* ARGSUSED */ +int +main(argc, argv) + int argc; + char **argv; +{ + extern int optind; + int ch; + struct iovec iov; + struct utmp utmp; + FILE *fp; + char *p, *ttymsg(); + char line[sizeof(utmp.ut_line) + 1]; + + 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; + strncpy(line, utmp.ut_line, sizeof(utmp.ut_line)); + line[sizeof(utmp.ut_line)] = '\0'; + if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL) + (void)fprintf(stderr, "wall: %s\n", p); + } + exit(0); +} + +void +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) != '\0'; ++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); +} |