1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1988, 1990, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif 38 39 40 /* 41 * This program is not related to David Wall, whose Stanford Ph.D. thesis 42 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 43 */ 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 #include <sys/uio.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <grp.h> 52 #include <locale.h> 53 #include <paths.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 #include <utmpx.h> 61 #include <wchar.h> 62 #include <wctype.h> 63 64 #include "ttymsg.h" 65 66 static void makemsg(char *); 67 static void usage(void) __dead2; 68 69 static struct wallgroup { 70 struct wallgroup *next; 71 char *name; 72 gid_t gid; 73 } *grouplist; 74 static int nobanner; 75 static int mbufsize; 76 static char *mbuf; 77 78 static int 79 ttystat(char *line) 80 { 81 struct stat sb; 82 char ttybuf[MAXPATHLEN]; 83 84 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); 85 if (stat(ttybuf, &sb) == 0) { 86 return (0); 87 } else 88 return (-1); 89 } 90 91 int 92 main(int argc, char *argv[]) 93 { 94 struct iovec iov; 95 struct utmpx *utmp; 96 int ch; 97 int ingroup; 98 struct wallgroup *g; 99 struct group *grp; 100 char **np; 101 const char *p; 102 struct passwd *pw; 103 104 (void)setlocale(LC_CTYPE, ""); 105 106 while ((ch = getopt(argc, argv, "g:n")) != -1) 107 switch (ch) { 108 case 'n': 109 /* undoc option for shutdown: suppress banner */ 110 if (geteuid() == 0) 111 nobanner = 1; 112 break; 113 case 'g': 114 g = (struct wallgroup *)malloc(sizeof *g); 115 g->next = grouplist; 116 g->name = optarg; 117 g->gid = -1; 118 grouplist = g; 119 break; 120 case '?': 121 default: 122 usage(); 123 } 124 argc -= optind; 125 argv += optind; 126 if (argc > 1) 127 usage(); 128 129 for (g = grouplist; g; g = g->next) { 130 grp = getgrnam(g->name); 131 if (grp != NULL) 132 g->gid = grp->gr_gid; 133 else 134 warnx("%s: no such group", g->name); 135 } 136 137 makemsg(*argv); 138 139 iov.iov_base = mbuf; 140 iov.iov_len = mbufsize; 141 /* NOSTRICT */ 142 while ((utmp = getutxent()) != NULL) { 143 if (utmp->ut_type != USER_PROCESS) 144 continue; 145 if (ttystat(utmp->ut_line) != 0) 146 continue; 147 if (grouplist) { 148 ingroup = 0; 149 pw = getpwnam(utmp->ut_user); 150 if (!pw) 151 continue; 152 for (g = grouplist; g && ingroup == 0; g = g->next) { 153 if (g->gid == (gid_t)-1) 154 continue; 155 if (g->gid == pw->pw_gid) 156 ingroup = 1; 157 else if ((grp = getgrgid(g->gid)) != NULL) { 158 for (np = grp->gr_mem; *np; np++) { 159 if (strcmp(*np, utmp->ut_user) == 0) { 160 ingroup = 1; 161 break; 162 } 163 } 164 } 165 } 166 if (ingroup == 0) 167 continue; 168 } 169 if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL) 170 warnx("%s", p); 171 } 172 exit(0); 173 } 174 175 static void 176 usage(void) 177 { 178 (void)fprintf(stderr, "usage: wall [-g group] [file]\n"); 179 exit(1); 180 } 181 182 void 183 makemsg(char *fname) 184 { 185 int cnt; 186 wchar_t ch; 187 struct tm *lt; 188 struct passwd *pw; 189 struct stat sbuf; 190 time_t now; 191 FILE *fp; 192 int fd; 193 char hostname[MAXHOSTNAMELEN], tmpname[64]; 194 wchar_t *p, *tmp, lbuf[256], codebuf[13]; 195 const char *tty; 196 const char *whom; 197 gid_t egid; 198 199 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 200 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) 201 err(1, "can't open temporary file"); 202 (void)unlink(tmpname); 203 204 if (!nobanner) { 205 tty = ttyname(STDERR_FILENO); 206 if (tty == NULL) 207 tty = "no tty"; 208 209 if (!(whom = getlogin())) 210 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 211 (void)gethostname(hostname, sizeof(hostname)); 212 (void)time(&now); 213 lt = localtime(&now); 214 215 /* 216 * all this stuff is to blank out a square for the message; 217 * we wrap message lines at column 79, not 80, because some 218 * terminals wrap after 79, some do not, and we can't tell. 219 * Which means that we may leave a non-blank character 220 * in column 80, but that can't be helped. 221 */ 222 (void)fwprintf(fp, L"\r%79s\r\n", " "); 223 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 224 L"Broadcast Message from %s@%s", 225 whom, hostname); 226 (void)fwprintf(fp, L"%-79.79S\007\007\r\n", lbuf); 227 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 228 L" (%s) at %d:%02d %s...", tty, 229 lt->tm_hour, lt->tm_min, lt->tm_zone); 230 (void)fwprintf(fp, L"%-79.79S\r\n", lbuf); 231 } 232 (void)fwprintf(fp, L"%79s\r\n", " "); 233 234 if (fname) { 235 egid = getegid(); 236 setegid(getgid()); 237 if (freopen(fname, "r", stdin) == NULL) 238 err(1, "can't read %s", fname); 239 if (setegid(egid) != 0) 240 err(1, "setegid failed"); 241 } 242 cnt = 0; 243 while (fgetws(lbuf, sizeof(lbuf)/sizeof(wchar_t), stdin)) { 244 for (p = lbuf; (ch = *p) != L'\0'; ++p, ++cnt) { 245 if (ch == L'\r') { 246 putwc(L'\r', fp); 247 cnt = 0; 248 continue; 249 } else if (ch == L'\n') { 250 for (; cnt < 79; ++cnt) 251 putwc(L' ', fp); 252 putwc(L'\r', fp); 253 putwc(L'\n', fp); 254 break; 255 } 256 if (cnt == 79) { 257 putwc(L'\r', fp); 258 putwc(L'\n', fp); 259 cnt = 0; 260 } 261 if (iswprint(ch) || iswspace(ch) || ch == L'\a' || ch == L'\b') { 262 putwc(ch, fp); 263 } else { 264 (void)swprintf(codebuf, sizeof(codebuf)/sizeof(wchar_t), L"<0x%X>", ch); 265 for (tmp = codebuf; *tmp != L'\0'; ++tmp) { 266 putwc(*tmp, fp); 267 if (++cnt == 79) { 268 putwc(L'\r', fp); 269 putwc(L'\n', fp); 270 cnt = 0; 271 } 272 } 273 --cnt; 274 } 275 } 276 } 277 (void)fwprintf(fp, L"%79s\r\n", " "); 278 rewind(fp); 279 280 if (fstat(fd, &sbuf)) 281 err(1, "can't stat temporary file"); 282 mbufsize = sbuf.st_size; 283 if (!(mbuf = malloc((u_int)mbufsize))) 284 err(1, "out of memory"); 285 if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 286 err(1, "can't read temporary file"); 287 fclose(fp); 288 } 289