1 /* 2 * Copyright (c) 1988, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1988, 1990, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif 39 40 #ifndef lint 41 static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93"; 42 #endif 43 44 /* 45 * This program is not related to David Wall, whose Stanford Ph.D. thesis 46 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 47 */ 48 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #include <sys/uio.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <grp.h> 56 #include <locale.h> 57 #include <paths.h> 58 #include <pwd.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <time.h> 63 #include <unistd.h> 64 #include <utmpx.h> 65 #include <wchar.h> 66 #include <wctype.h> 67 68 #include "ttymsg.h" 69 70 static void makemsg(char *); 71 static void usage(void); 72 73 static struct wallgroup { 74 struct wallgroup *next; 75 char *name; 76 gid_t gid; 77 } *grouplist; 78 static int nobanner; 79 static int mbufsize; 80 static char *mbuf; 81 82 static int 83 ttystat(char *line) 84 { 85 struct stat sb; 86 char ttybuf[MAXPATHLEN]; 87 88 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); 89 if (stat(ttybuf, &sb) == 0) { 90 return (0); 91 } else 92 return (-1); 93 } 94 95 int 96 main(int argc, char *argv[]) 97 { 98 struct iovec iov; 99 struct utmpx *utmp; 100 int ch; 101 int ingroup; 102 struct wallgroup *g; 103 struct group *grp; 104 char **np; 105 const char *p; 106 struct passwd *pw; 107 108 (void)setlocale(LC_CTYPE, ""); 109 110 while ((ch = getopt(argc, argv, "g:n")) != -1) 111 switch (ch) { 112 case 'n': 113 /* undoc option for shutdown: suppress banner */ 114 if (geteuid() == 0) 115 nobanner = 1; 116 break; 117 case 'g': 118 g = (struct wallgroup *)malloc(sizeof *g); 119 g->next = grouplist; 120 g->name = optarg; 121 g->gid = -1; 122 grouplist = g; 123 break; 124 case '?': 125 default: 126 usage(); 127 } 128 argc -= optind; 129 argv += optind; 130 if (argc > 1) 131 usage(); 132 133 for (g = grouplist; g; g = g->next) { 134 grp = getgrnam(g->name); 135 if (grp != NULL) 136 g->gid = grp->gr_gid; 137 else 138 warnx("%s: no such group", g->name); 139 } 140 141 makemsg(*argv); 142 143 iov.iov_base = mbuf; 144 iov.iov_len = mbufsize; 145 /* NOSTRICT */ 146 while ((utmp = getutxent()) != NULL) { 147 if (utmp->ut_type != USER_PROCESS) 148 continue; 149 if (ttystat(utmp->ut_line) != 0) 150 continue; 151 if (grouplist) { 152 ingroup = 0; 153 pw = getpwnam(utmp->ut_user); 154 if (!pw) 155 continue; 156 for (g = grouplist; g && ingroup == 0; g = g->next) { 157 if (g->gid == (gid_t)-1) 158 continue; 159 if (g->gid == pw->pw_gid) 160 ingroup = 1; 161 else if ((grp = getgrgid(g->gid)) != NULL) { 162 for (np = grp->gr_mem; *np; np++) { 163 if (strcmp(*np, utmp->ut_user) == 0) { 164 ingroup = 1; 165 break; 166 } 167 } 168 } 169 } 170 if (ingroup == 0) 171 continue; 172 } 173 if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL) 174 warnx("%s", p); 175 } 176 exit(0); 177 } 178 179 static void 180 usage(void) 181 { 182 (void)fprintf(stderr, "usage: wall [-g group] [file]\n"); 183 exit(1); 184 } 185 186 void 187 makemsg(char *fname) 188 { 189 int cnt; 190 wchar_t ch; 191 struct tm *lt; 192 struct passwd *pw; 193 struct stat sbuf; 194 time_t now; 195 FILE *fp; 196 int fd; 197 char hostname[MAXHOSTNAMELEN], tmpname[64]; 198 wchar_t *p, *tmp, lbuf[256], codebuf[13]; 199 const char *tty; 200 const char *whom; 201 gid_t egid; 202 203 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 204 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) 205 err(1, "can't open temporary file"); 206 (void)unlink(tmpname); 207 208 if (!nobanner) { 209 tty = ttyname(STDERR_FILENO); 210 if (tty == NULL) 211 tty = "no tty"; 212 213 if (!(whom = getlogin())) 214 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 215 (void)gethostname(hostname, sizeof(hostname)); 216 (void)time(&now); 217 lt = localtime(&now); 218 219 /* 220 * all this stuff is to blank out a square for the message; 221 * we wrap message lines at column 79, not 80, because some 222 * terminals wrap after 79, some do not, and we can't tell. 223 * Which means that we may leave a non-blank character 224 * in column 80, but that can't be helped. 225 */ 226 (void)fwprintf(fp, L"\r%79s\r\n", " "); 227 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 228 L"Broadcast Message from %s@%s", 229 whom, hostname); 230 (void)fwprintf(fp, L"%-79.79S\007\007\r\n", lbuf); 231 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 232 L" (%s) at %d:%02d %s...", tty, 233 lt->tm_hour, lt->tm_min, lt->tm_zone); 234 (void)fwprintf(fp, L"%-79.79S\r\n", lbuf); 235 } 236 (void)fwprintf(fp, L"%79s\r\n", " "); 237 238 if (fname) { 239 egid = getegid(); 240 setegid(getgid()); 241 if (freopen(fname, "r", stdin) == NULL) 242 err(1, "can't read %s", fname); 243 if (setegid(egid) != 0) 244 err(1, "setegid failed"); 245 } 246 cnt = 0; 247 while (fgetws(lbuf, sizeof(lbuf)/sizeof(wchar_t), stdin)) { 248 for (p = lbuf; (ch = *p) != L'\0'; ++p, ++cnt) { 249 if (ch == L'\r') { 250 putwc(L'\r', fp); 251 cnt = 0; 252 continue; 253 } else if (ch == L'\n') { 254 for (; cnt < 79; ++cnt) 255 putwc(L' ', fp); 256 putwc(L'\r', fp); 257 putwc(L'\n', fp); 258 break; 259 } 260 if (cnt == 79) { 261 putwc(L'\r', fp); 262 putwc(L'\n', fp); 263 cnt = 0; 264 } 265 if (iswprint(ch) || iswspace(ch) || ch == L'\a' || ch == L'\b') { 266 putwc(ch, fp); 267 } else { 268 (void)swprintf(codebuf, sizeof(codebuf)/sizeof(wchar_t), L"<0x%X>", ch); 269 for (tmp = codebuf; *tmp != L'\0'; ++tmp) { 270 putwc(*tmp, fp); 271 if (++cnt == 79) { 272 putwc(L'\r', fp); 273 putwc(L'\n', fp); 274 cnt = 0; 275 } 276 } 277 --cnt; 278 } 279 } 280 } 281 (void)fwprintf(fp, L"%79s\r\n", " "); 282 rewind(fp); 283 284 if (fstat(fd, &sbuf)) 285 err(1, "can't stat temporary file"); 286 mbufsize = sbuf.st_size; 287 if (!(mbuf = malloc((u_int)mbufsize))) 288 err(1, "out of memory"); 289 if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 290 err(1, "can't read temporary file"); 291 (void)close(fd); 292 } 293