1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 /* 38 * Luke Mewburn <lm@rmit.edu.au> added the following on 940622: 39 * - mail status ("No Mail", "Mail read:...", or "New Mail ..., 40 * Unread since ...".) 41 * - 4 digit phone extensions (3210 is printed as x3210.) 42 * - host/office toggling in short format with -h & -o. 43 * - short day names (`Tue' printed instead of `Jun 21' if the 44 * login time is < 6 days. 45 */ 46 47 #ifndef lint 48 static const char copyright[] = 49 "@(#) Copyright (c) 1989, 1993\n\ 50 The Regents of the University of California. All rights reserved.\n"; 51 #endif /* not lint */ 52 53 #ifndef lint 54 #if 0 55 static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95"; 56 #else 57 static const char rcsid[] = 58 "$FreeBSD$"; 59 #endif 60 #endif /* not lint */ 61 62 /* 63 * Finger prints out information about users. It is not portable since 64 * certain fields (e.g. the full user name, office, and phone numbers) are 65 * extracted from the gecos field of the passwd file which other UNIXes 66 * may not have or may use for other things. 67 * 68 * There are currently two output formats; the short format is one line 69 * per user and displays login name, tty, login time, real name, idle time, 70 * and either remote host information (default) or office location/phone 71 * number, depending on if -h or -o is used respectively. 72 * The long format gives the same information (in a more legible format) as 73 * well as home directory, shell, mail info, and .plan/.project files. 74 */ 75 76 #include <sys/param.h> 77 78 #include <db.h> 79 #include <err.h> 80 #include <errno.h> 81 #include <fcntl.h> 82 #include <pwd.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <time.h> 87 #include <unistd.h> 88 #include <utmp.h> 89 #include <db.h> 90 #include <locale.h> 91 #include <sys/syslimits.h> 92 93 #include "finger.h" 94 #include "pathnames.h" 95 96 DB *db; 97 time_t now; 98 int entries, lflag, mflag, pplan, sflag, oflag, Tflag; 99 char tbuf[1024]; 100 101 static void loginlist __P((void)); 102 static void usage __P((void)); 103 static void userlist __P((int, char **)); 104 105 int 106 option(argc, argv) 107 int argc; 108 char **argv; 109 { 110 int ch; 111 112 optind = 1; /* reset getopt */ 113 114 while ((ch = getopt(argc, argv, "lmpshoT")) != -1) 115 switch(ch) { 116 case 'l': 117 lflag = 1; /* long format */ 118 break; 119 case 'm': 120 mflag = 1; /* force exact match of names */ 121 break; 122 case 'p': 123 pplan = 1; /* don't show .plan/.project */ 124 break; 125 case 's': 126 sflag = 1; /* short format */ 127 break; 128 case 'h': 129 oflag = 0; /* remote host info */ 130 break; 131 case 'o': 132 oflag = 1; /* office info */ 133 break; 134 case 'T': 135 Tflag = 1; /* disable T/TCP */ 136 break; 137 case '?': 138 default: 139 usage(); 140 } 141 142 return optind; 143 } 144 145 static void 146 usage() 147 { 148 (void)fprintf(stderr, "usage: finger [-lmpshoT] [login ...]\n"); 149 exit(1); 150 } 151 152 int 153 main(argc, argv) 154 int argc; 155 char **argv; 156 { 157 int envargc, argcnt; 158 char *envargv[3]; 159 struct passwd *pw; 160 161 if (getuid() == 0 || geteuid() == 0) { 162 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) { 163 setgid(pw->pw_gid); 164 setuid(pw->pw_uid); 165 } else { 166 setgid(UNPRIV_UGID); 167 setuid(UNPRIV_UGID); 168 } 169 } 170 171 (void) setlocale(LC_ALL, ""); 172 173 /* remove this line to get remote host */ 174 oflag = 1; /* default to old "office" behavior */ 175 176 /* 177 * Process environment variables followed by command line arguments. 178 */ 179 if ((envargv[1] = getenv("FINGER"))) { 180 envargc = 2; 181 envargv[0] = "finger"; 182 envargv[2] = NULL; 183 (void) option(envargc, envargv); 184 } 185 186 argcnt = option(argc, argv); 187 argc -= argcnt; 188 argv += argcnt; 189 190 (void)time(&now); 191 setpassent(1); 192 if (!*argv) { 193 /* 194 * Assign explicit "small" format if no names given and -l 195 * not selected. Force the -s BEFORE we get names so proper 196 * screening will be done. 197 */ 198 if (!lflag) 199 sflag = 1; /* if -l not explicit, force -s */ 200 loginlist(); 201 if (entries == 0) 202 (void)printf("No one logged on.\n"); 203 } else { 204 userlist(argc, argv); 205 /* 206 * Assign explicit "large" format if names given and -s not 207 * explicitly stated. Force the -l AFTER we get names so any 208 * remote finger attempts specified won't be mishandled. 209 */ 210 if (!sflag) 211 lflag = 1; /* if -s not explicit, force -l */ 212 } 213 if (entries) { 214 if (lflag) 215 lflag_print(); 216 else 217 sflag_print(); 218 } 219 return (0); 220 } 221 222 static void 223 loginlist() 224 { 225 register PERSON *pn; 226 DBT data, key; 227 struct passwd *pw; 228 struct utmp user; 229 int r, sflag; 230 char name[UT_NAMESIZE + 1]; 231 232 if (!freopen(_PATH_UTMP, "r", stdin)) 233 err(1, "%s", _PATH_UTMP); 234 name[UT_NAMESIZE] = '\0'; 235 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) { 236 if (!user.ut_name[0]) 237 continue; 238 if ((pn = find_person(user.ut_name)) == NULL) { 239 bcopy(user.ut_name, name, UT_NAMESIZE); 240 if ((pw = getpwnam(name)) == NULL) 241 continue; 242 if (hide(pw)) 243 continue; 244 pn = enter_person(pw); 245 } 246 enter_where(&user, pn); 247 } 248 if (db && lflag) 249 for (sflag = R_FIRST;; sflag = R_NEXT) { 250 PERSON *tmp; 251 252 r = (*db->seq)(db, &key, &data, sflag); 253 if (r == -1) 254 err(1, "db seq"); 255 if (r == 1) 256 break; 257 memmove(&tmp, data.data, sizeof tmp); 258 enter_lastlog(tmp); 259 } 260 } 261 262 static void 263 userlist(argc, argv) 264 register int argc; 265 register char **argv; 266 { 267 register PERSON *pn; 268 DBT data, key; 269 struct utmp user; 270 struct passwd *pw; 271 int r, sflag, *used, *ip; 272 char **ap, **nargv, **np, **p; 273 FILE *conf_fp; 274 char conf_alias[LINE_MAX]; 275 char *conf_realname; 276 int conf_length; 277 278 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL || 279 (used = calloc(argc, sizeof(int))) == NULL) 280 err(1, NULL); 281 282 /* Pull out all network requests. */ 283 for (ap = p = argv, np = nargv; *p; ++p) 284 if (index(*p, '@')) 285 *np++ = *p; 286 else 287 *ap++ = *p; 288 289 *np++ = NULL; 290 *ap++ = NULL; 291 292 if (!*argv) 293 goto net; 294 295 /* 296 * Mark any arguments beginning with '/' as invalid so that we 297 * don't accidently confuse them with expansions from finger.conf 298 */ 299 for (p = argv, ip = used; *p; ++p, ++ip) 300 if (**p == '/') { 301 *ip = 1; 302 warnx("%s: no such user", *p); 303 } 304 305 /* 306 * Traverse the finger alias configuration file of the form 307 * alias:(user|alias), ignoring comment lines beginning '#'. 308 */ 309 if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) { 310 while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) { 311 conf_length = strlen(conf_alias); 312 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n') 313 continue; 314 conf_alias[conf_length] = '\0'; /* Remove trailing LF */ 315 if ((conf_realname = strchr(conf_alias, ':')) == NULL) 316 continue; 317 *conf_realname = '\0'; /* Replace : with NUL */ 318 for (p = argv; *p; ++p) { 319 if (strcmp(*p, conf_alias) == NULL) { 320 if ((*p = strdup(conf_realname+1)) == NULL) { 321 err(1, NULL); 322 } 323 } 324 } 325 } 326 (void)fclose(conf_fp); 327 } 328 329 /* 330 * Traverse the list of possible login names and check the login name 331 * and real name against the name specified by the user. If the name 332 * begins with a '/', try to read the file of that name instead of 333 * gathering the traditional finger information. 334 */ 335 if (mflag) 336 for (p = argv, ip = used; *p; ++p, ++ip) { 337 if (**p != '/' || *ip == 1 || !show_text("", *p, "")) { 338 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 339 enter_person(pw); 340 else if (!*ip) 341 warnx("%s: no such user", *p); 342 } 343 } 344 else { 345 while ((pw = getpwent()) != NULL) { 346 for (p = argv, ip = used; *p; ++p, ++ip) 347 if (**p == '/' && *ip != 1 348 && show_text("", *p, "")) 349 *ip = 1; 350 else if (match(pw, *p) && !hide(pw)) { 351 enter_person(pw); 352 *ip = 1; 353 } 354 } 355 for (p = argv, ip = used; *p; ++p, ++ip) 356 if (!*ip) 357 warnx("%s: no such user", *p); 358 } 359 360 /* Handle network requests. */ 361 net: for (p = nargv; *p;) { 362 netfinger(*p++); 363 if (*p || entries) 364 printf("\n"); 365 } 366 367 if (entries == 0) 368 return; 369 370 /* 371 * Scan thru the list of users currently logged in, saving 372 * appropriate data whenever a match occurs. 373 */ 374 if (!freopen(_PATH_UTMP, "r", stdin)) 375 err(1, "%s", _PATH_UTMP); 376 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) { 377 if (!user.ut_name[0]) 378 continue; 379 if ((pn = find_person(user.ut_name)) == NULL) 380 continue; 381 enter_where(&user, pn); 382 } 383 if (db) 384 for (sflag = R_FIRST;; sflag = R_NEXT) { 385 PERSON *tmp; 386 387 r = (*db->seq)(db, &key, &data, sflag); 388 if (r == -1) 389 err(1, "db seq"); 390 if (r == 1) 391 break; 392 memmove(&tmp, data.data, sizeof tmp); 393 enter_lastlog(tmp); 394 } 395 } 396