Annotation of src/usr.bin/wall/wall.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: wall.c,v 1.6 1994/11/17 07:17:58 jtc Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1988, 1990, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by the University of
! 18: * California, Berkeley and its contributors.
! 19: * 4. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: */
! 35:
! 36: #ifndef lint
! 37: static char copyright[] =
! 38: "@(#) Copyright (c) 1988, 1990, 1993\n\
! 39: The Regents of the University of California. All rights reserved.\n";
! 40: #endif /* not lint */
! 41:
! 42: #ifndef lint
! 43: #if 0
! 44: static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
! 45: #endif
! 46: static char rcsid[] = "$NetBSD: wall.c,v 1.6 1994/11/17 07:17:58 jtc 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:
! 59: #include <paths.h>
! 60: #include <pwd.h>
! 61: #include <stdio.h>
! 62: #include <stdlib.h>
! 63: #include <string.h>
! 64: #include <unistd.h>
! 65: #include <utmp.h>
! 66:
! 67: void makemsg __P((char *));
! 68:
! 69: #define IGNOREUSER "sleeper"
! 70:
! 71: int nobanner;
! 72: int mbufsize;
! 73: char *mbuf;
! 74:
! 75: /* ARGSUSED */
! 76: int
! 77: main(argc, argv)
! 78: int argc;
! 79: char **argv;
! 80: {
! 81: extern int optind;
! 82: int ch;
! 83: struct iovec iov;
! 84: struct utmp utmp;
! 85: FILE *fp;
! 86: char *p, *ttymsg();
! 87: struct passwd *pep = getpwnam("nobody");
! 88: char line[sizeof(utmp.ut_line) + 1];
! 89:
! 90: while ((ch = getopt(argc, argv, "n")) != EOF)
! 91: switch (ch) {
! 92: case 'n':
! 93: /* undoc option for shutdown: suppress banner */
! 94: if (geteuid() == 0 || (pep && getuid() == pep->pw_uid))
! 95: nobanner = 1;
! 96: break;
! 97: case '?':
! 98: default:
! 99: usage:
! 100: (void)fprintf(stderr, "usage: wall [file]\n");
! 101: exit(1);
! 102: }
! 103: argc -= optind;
! 104: argv += optind;
! 105: if (argc > 1)
! 106: goto usage;
! 107:
! 108: makemsg(*argv);
! 109:
! 110: if (!(fp = fopen(_PATH_UTMP, "r"))) {
! 111: (void)fprintf(stderr, "wall: cannot read %s.\n", _PATH_UTMP);
! 112: exit(1);
! 113: }
! 114: iov.iov_base = mbuf;
! 115: iov.iov_len = mbufsize;
! 116: /* NOSTRICT */
! 117: while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
! 118: if (!utmp.ut_name[0] ||
! 119: !strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name)))
! 120: continue;
! 121: strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
! 122: line[sizeof(utmp.ut_line)] = '\0';
! 123: if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
! 124: (void)fprintf(stderr, "wall: %s\n", p);
! 125: }
! 126: exit(0);
! 127: }
! 128:
! 129: void
! 130: makemsg(fname)
! 131: char *fname;
! 132: {
! 133: register int ch, cnt;
! 134: struct tm *lt;
! 135: struct passwd *pw;
! 136: struct stat sbuf;
! 137: time_t now, time();
! 138: FILE *fp;
! 139: int fd;
! 140: char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[15];
! 141:
! 142: (void)strcpy(tmpname, _PATH_TMP);
! 143: (void)strcat(tmpname, "/wall.XXXXXX");
! 144: if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) {
! 145: (void)fprintf(stderr, "wall: can't open temporary file.\n");
! 146: exit(1);
! 147: }
! 148: (void)unlink(tmpname);
! 149:
! 150: if (!nobanner) {
! 151: if (!(whom = getlogin()))
! 152: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
! 153: (void)gethostname(hostname, sizeof(hostname));
! 154: (void)time(&now);
! 155: lt = localtime(&now);
! 156:
! 157: /*
! 158: * all this stuff is to blank out a square for the message;
! 159: * we wrap message lines at column 79, not 80, because some
! 160: * terminals wrap after 79, some do not, and we can't tell.
! 161: * Which means that we may leave a non-blank character
! 162: * in column 80, but that can't be helped.
! 163: */
! 164: (void)fprintf(fp, "\r%79s\r\n", " ");
! 165: (void)sprintf(lbuf, "Broadcast Message from %s@%s",
! 166: whom, hostname);
! 167: (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
! 168: (void)sprintf(lbuf, " (%s) at %d:%02d ...", ttyname(2),
! 169: lt->tm_hour, lt->tm_min);
! 170: (void)fprintf(fp, "%-79.79s\r\n", lbuf);
! 171: }
! 172: (void)fprintf(fp, "%79s\r\n", " ");
! 173:
! 174: if (fname && !(freopen(fname, "r", stdin))) {
! 175: (void)fprintf(stderr, "wall: can't read %s.\n", fname);
! 176: exit(1);
! 177: }
! 178: while (fgets(lbuf, sizeof(lbuf), stdin))
! 179: for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
! 180: if (cnt == 79 || ch == '\n') {
! 181: for (; cnt < 79; ++cnt)
! 182: putc(' ', fp);
! 183: putc('\r', fp);
! 184: putc('\n', fp);
! 185: cnt = -1;
! 186: }
! 187: if (ch != '\n')
! 188: putc(ch, fp);
! 189: }
! 190: (void)fprintf(fp, "%79s\r\n", " ");
! 191: rewind(fp);
! 192:
! 193: if (fstat(fd, &sbuf)) {
! 194: (void)fprintf(stderr, "wall: can't stat temporary file.\n");
! 195: exit(1);
! 196: }
! 197: mbufsize = sbuf.st_size;
! 198: if (!(mbuf = malloc((u_int)mbufsize))) {
! 199: (void)fprintf(stderr, "wall: out of memory.\n");
! 200: exit(1);
! 201: }
! 202: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) {
! 203: (void)fprintf(stderr, "wall: can't read temporary file.\n");
! 204: exit(1);
! 205: }
! 206: (void)close(fd);
! 207: }
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