/*- * SPDX-License-Identifier: BSD-3-Clause * * 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. 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. */ /* * This program is not related to David Wall, whose Stanford Ph.D. thesis * is entitled "Mechanisms for Broadcast and Selective Broadcast". */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ttymsg.h" static void makemsg(char *); static void usage(void) __dead2; static struct wallgroup { struct wallgroup *next; char *name; gid_t gid; } *grouplist; static int nobanner; static int mbufsize; static char *mbuf; static int ttystat(char *line) { struct stat sb; char ttybuf[MAXPATHLEN]; (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); if (stat(ttybuf, &sb) == 0) { return (0); } else return (-1); } int main(int argc, char *argv[]) { struct iovec iov; struct utmpx *utmp; int ch; int ingroup; struct wallgroup *g; struct group *grp; char **np; const char *p; struct passwd *pw; (void)setlocale(LC_CTYPE, ""); while ((ch = getopt(argc, argv, "g:n")) != -1) switch (ch) { case 'n': /* undoc option for shutdown: suppress banner */ if (geteuid() == 0) nobanner = 1; break; case 'g': g = (struct wallgroup *)malloc(sizeof *g); g->next = grouplist; g->name = optarg; g->gid = -1; grouplist = g; break; case '?': default: usage(); } argc -= optind; argv += optind; if (argc > 1) usage(); for (g = grouplist; g; g = g->next) { grp = getgrnam(g->name); if (grp != NULL) g->gid = grp->gr_gid; else warnx("%s: no such group", g->name); } makemsg(*argv); iov.iov_base = mbuf; iov.iov_len = mbufsize; /* NOSTRICT */ while ((utmp = getutxent()) != NULL) { if (utmp->ut_type != USER_PROCESS) continue; if (ttystat(utmp->ut_line) != 0) continue; if (grouplist) { ingroup = 0; pw = getpwnam(utmp->ut_user); if (!pw) continue; for (g = grouplist; g && ingroup == 0; g = g->next) { if (g->gid == (gid_t)-1) continue; if (g->gid == pw->pw_gid) ingroup = 1; else if ((grp = getgrgid(g->gid)) != NULL) { for (np = grp->gr_mem; *np; np++) { if (strcmp(*np, utmp->ut_user) == 0) { ingroup = 1; break; } } } } if (ingroup == 0) continue; } if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL) warnx("%s", p); } exit(0); } static void usage(void) { (void)fprintf(stderr, "usage: wall [-g group] [file]\n"); exit(1); } void makemsg(char *fname) { int cnt; wchar_t ch; struct tm *lt; struct passwd *pw; struct stat sbuf; time_t now; FILE *fp; int fd; char hostname[MAXHOSTNAMELEN], tmpname[64]; wchar_t *p, *tmp, lbuf[256], codebuf[13]; const char *tty; const char *whom; gid_t egid; (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) err(1, "can't open temporary file"); (void)unlink(tmpname); if (!nobanner) { tty = ttyname(STDERR_FILENO); if (tty == NULL) tty = "no tty"; 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)fwprintf(fp, L"\r%79s\r\n", " "); (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), L"Broadcast Message from %s@%s", whom, hostname); (void)fwprintf(fp, L"%-79.79S\007\007\r\n", lbuf); (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), L" (%s) at %d:%02d %s...", tty, lt->tm_hour, lt->tm_min, lt->tm_zone); (void)fwprintf(fp, L"%-79.79S\r\n", lbuf); } (void)fwprintf(fp, L"%79s\r\n", " "); if (fname) { egid = getegid(); setegid(getgid()); if (freopen(fname, "r", stdin) == NULL) err(1, "can't read %s", fname); if (setegid(egid) != 0) err(1, "setegid failed"); } cnt = 0; while (fgetws(lbuf, sizeof(lbuf)/sizeof(wchar_t), stdin)) { for (p = lbuf; (ch = *p) != L'\0'; ++p, ++cnt) { if (ch == L'\r') { putwc(L'\r', fp); cnt = 0; continue; } else if (ch == L'\n') { for (; cnt < 79; ++cnt) putwc(L' ', fp); putwc(L'\r', fp); putwc(L'\n', fp); break; } if (cnt == 79) { putwc(L'\r', fp); putwc(L'\n', fp); cnt = 0; } if (iswprint(ch) || iswspace(ch) || ch == L'\a' || ch == L'\b') { putwc(ch, fp); } else { (void)swprintf(codebuf, sizeof(codebuf)/sizeof(wchar_t), L"<0x%X>", ch); for (tmp = codebuf; *tmp != L'\0'; ++tmp) { putwc(*tmp, fp); if (++cnt == 79) { putwc(L'\r', fp); putwc(L'\n', fp); cnt = 0; } } --cnt; } } } (void)fwprintf(fp, L"%79s\r\n", " "); rewind(fp); if (fstat(fd, &sbuf)) err(1, "can't stat temporary file"); mbufsize = sbuf.st_size; if (!(mbuf = malloc((u_int)mbufsize))) err(1, "out of memory"); if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) err(1, "can't read temporary file"); fclose(fp); }