/* * 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. * * Modified Sun Mar 12 10:34:34 1995, faith@cs.unc.edu, for Linux */ /* * This program is not related to David Wall, whose Stanford Ph.D. thesis * is entitled "Mechanisms for Broadcast and Selective Broadcast". * * 1999-02-22 Arkadiusz Mi¶kiewicz * - added Native Language Support * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nls.h" #include "xalloc.h" #include "strutils.h" #include "ttymsg.h" #include "pathnames.h" #include "carefulputc.h" void makemsg __P((char *)); #define IGNOREUSER "sleeper" #ifndef MAXHOSTNAMELEN # ifdef HOST_NAME_MAX # define MAXHOSTNAMELEN HOST_NAME_MAX # else # define MAXHOSTNAMELEN 64 # endif #endif int nobanner; int mbufsize; char *mbuf; char *progname = "wall"; int main(int argc, char **argv) { extern int optind; int ch; struct iovec iov; struct utmp *utmpptr; char *p; char line[sizeof(utmpptr->ut_line) + 1]; setlocale(LC_ALL, ""); bindtextdomain(PACKAGE, LOCALEDIR); textdomain(PACKAGE); progname = argv[0]; p = strrchr(progname, '/'); if (p) progname = p+1; while ((ch = getopt(argc, argv, "n")) != -1) switch (ch) { case 'n': /* undoc option for shutdown: suppress banner */ if (geteuid() == 0) nobanner = 1; break; case '?': default: usage: (void)fprintf(stderr, _("usage: %s [file]\n"), progname); exit(1); } argc -= optind; argv += optind; if (argc > 1) goto usage; makemsg(*argv); setutent(); iov.iov_base = mbuf; iov.iov_len = mbufsize; while((utmpptr = getutent())) { if (!utmpptr->ut_name[0] || !strncmp(utmpptr->ut_name, IGNOREUSER, sizeof(utmpptr->ut_name))) continue; #ifdef USER_PROCESS if (utmpptr->ut_type != USER_PROCESS) continue; #endif /* Joey Hess reports that use-sessreg in /etc/X11/wdm/ produces ut_line entries like :0, and a write to /dev/:0 fails. */ if (utmpptr->ut_line[0] == ':') continue; xstrncpy(line, utmpptr->ut_line, sizeof(utmpptr->ut_line)); if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL) (void)fprintf(stderr, "%s: %s\n", progname, p); } endutent(); exit(0); } void makemsg(fname) char *fname; { register int ch, cnt; struct tm *lt; struct passwd *pw; struct stat sbuf; time_t now; FILE *fp; int fd; char *p, *whom, *where, hostname[MAXHOSTNAMELEN], lbuf[MAXHOSTNAMELEN + 320], tmpname[sizeof(_PATH_TMP) + 20]; (void)sprintf(tmpname, "%s/wall.XXXXXX", _PATH_TMP); if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) { (void)fprintf(stderr, _("%s: can't open temporary file.\n"), progname); exit(1); } (void)unlink(tmpname); if (!nobanner) { if (!(whom = getlogin()) || !*whom) whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; if (!whom || strlen(whom) > 100) whom = "someone"; where = ttyname(2); if (!where || strlen(where) > 100) where = "somewhere"; (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. */ /* snprintf is not always available, but the sprintf's here will not overflow as long as %d takes at most 100 chars */ (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 ...", where, lt->tm_hour, lt->tm_min); (void)fprintf(fp, "%-79.79s\r\n", lbuf); } (void)fprintf(fp, "%79s\r\n", " "); if (fname) { /* * When we are not root, but suid or sgid, refuse to read files * (e.g. device files) that the user may not have access to. * After all, our invoker can easily do "wall < file" * instead of "wall file". */ int uid = getuid(); if (uid && (uid != geteuid() || getgid() != getegid())) { fprintf(stderr, _("%s: will not read %s - use stdin.\n"), progname, fname); exit(1); } if (!freopen(fname, "r", stdin)) { fprintf(stderr, _("%s: can't read %s.\n"), progname, 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; } if (ch != '\n') carefulputc(ch, fp); } } fprintf(fp, "%79s\r\n", " "); rewind(fp); if (fstat(fd, &sbuf)) { fprintf(stderr, _("%s: can't stat temporary file.\n"), progname); exit(1); } mbufsize = sbuf.st_size; mbuf = xmalloc(mbufsize); if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) { (void)fprintf(stderr, _("%s: can't read temporary file.\n"), progname); exit(1); } (void)close(fd); }