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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Luke Mewburn <lm@rmit.edu.au> added the following on 940622: 35 * - mail status ("No Mail", "Mail read:...", or "New Mail ..., 36 * Unread since ...".) 37 * - 4 digit phone extensions (3210 is printed as x3210.) 38 * - host/office toggling in short format with -h & -o. 39 * - short day names (`Tue' printed instead of `Jun 21' if the 40 * login time is < 6 days. 41 */ 42 43 #ifndef lint 44 static const char copyright[] = 45 "@(#) Copyright (c) 1989, 1993\n\ 46 The Regents of the University of California. All rights reserved.\n"; 47 #endif /* not lint */ 48 49 #if 0 50 #ifndef lint 51 static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95"; 52 #endif 53 #endif 54 55 #include <sys/cdefs.h> 56 __FBSDID("$FreeBSD$"); 57 58 /* 59 * Finger prints out information about users. It is not portable since 60 * certain fields (e.g. the full user name, office, and phone numbers) are 61 * extracted from the gecos field of the passwd file which other UNIXes 62 * may not have or may use for other things. 63 * 64 * There are currently two output formats; the short format is one line 65 * per user and displays login name, tty, login time, real name, idle time, 66 * and either remote host information (default) or office location/phone 67 * number, depending on if -h or -o is used respectively. 68 * The long format gives the same information (in a more legible format) as 69 * well as home directory, shell, mail info, and .plan/.project files. 70 */ 71 72 #include <sys/types.h> 73 #include <sys/socket.h> 74 #include <db.h> 75 #include <err.h> 76 #include <pwd.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <time.h> 81 #include <unistd.h> 82 #include <utmpx.h> 83 #include <locale.h> 84 85 #include "finger.h" 86 #include "pathnames.h" 87 88 DB *db; 89 time_t now; 90 int entries, gflag, kflag, lflag, mflag, pplan, sflag, oflag; 91 sa_family_t family = PF_UNSPEC; 92 int d_first = -1; 93 char tbuf[1024]; 94 int invoker_root = 0; 95 96 static void loginlist(void); 97 static int option(int, char **); 98 static void usage(void); 99 static void userlist(int, char **); 100 101 static int 102 option(int argc, char **argv) 103 { 104 int ch; 105 106 optind = 1; /* reset getopt */ 107 108 while ((ch = getopt(argc, argv, "46gklmpsho")) != -1) 109 switch(ch) { 110 case '4': 111 family = AF_INET; 112 break; 113 case '6': 114 family = AF_INET6; 115 break; 116 case 'g': 117 gflag = 1; 118 break; 119 case 'k': 120 kflag = 1; /* keep going without utmp */ 121 break; 122 case 'l': 123 lflag = 1; /* long format */ 124 break; 125 case 'm': 126 mflag = 1; /* force exact match of names */ 127 break; 128 case 'p': 129 pplan = 1; /* don't show .plan/.project */ 130 break; 131 case 's': 132 sflag = 1; /* short format */ 133 break; 134 case 'h': 135 oflag = 0; /* remote host info */ 136 break; 137 case 'o': 138 oflag = 1; /* office info */ 139 break; 140 case '?': 141 default: 142 usage(); 143 } 144 145 return optind; 146 } 147 148 static void 149 usage(void) 150 { 151 (void)fprintf(stderr, 152 "usage: finger [-46gklmpsho] [user ...] [user@host ...]\n"); 153 exit(1); 154 } 155 156 int 157 main(int argc, char **argv) 158 { 159 int envargc, argcnt; 160 char *envargv[3]; 161 struct passwd *pw; 162 static char myname[] = "finger"; 163 164 if (getuid() == 0 || geteuid() == 0) { 165 invoker_root = 1; 166 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) { 167 setgid(pw->pw_gid); 168 setuid(pw->pw_uid); 169 } else { 170 setgid(UNPRIV_UGID); 171 setuid(UNPRIV_UGID); 172 } 173 } 174 175 (void) setlocale(LC_ALL, ""); 176 177 /* remove this line to get remote host */ 178 oflag = 1; /* default to old "office" behavior */ 179 180 /* 181 * Process environment variables followed by command line arguments. 182 */ 183 if ((envargv[1] = getenv("FINGER"))) { 184 envargc = 2; 185 envargv[0] = myname; 186 envargv[2] = NULL; 187 (void) option(envargc, envargv); 188 } 189 190 argcnt = option(argc, argv); 191 argc -= argcnt; 192 argv += argcnt; 193 194 (void)time(&now); 195 setpassent(1); 196 if (!*argv) { 197 /* 198 * Assign explicit "small" format if no names given and -l 199 * not selected. Force the -s BEFORE we get names so proper 200 * screening will be done. 201 */ 202 if (!lflag) 203 sflag = 1; /* if -l not explicit, force -s */ 204 loginlist(); 205 if (entries == 0) 206 (void)printf("No one logged on.\n"); 207 } else { 208 userlist(argc, argv); 209 /* 210 * Assign explicit "large" format if names given and -s not 211 * explicitly stated. Force the -l AFTER we get names so any 212 * remote finger attempts specified won't be mishandled. 213 */ 214 if (!sflag) 215 lflag = 1; /* if -s not explicit, force -l */ 216 } 217 if (entries) { 218 if (lflag) 219 lflag_print(); 220 else 221 sflag_print(); 222 } 223 return (0); 224 } 225 226 static void 227 loginlist(void) 228 { 229 PERSON *pn; 230 DBT data, key; 231 struct passwd *pw; 232 struct utmpx *user; 233 int r, sflag1; 234 235 if (kflag) 236 errx(1, "can't list logins without reading utmp"); 237 238 setutxent(); 239 while ((user = getutxent()) != NULL) { 240 if (user->ut_type != USER_PROCESS) 241 continue; 242 if ((pn = find_person(user->ut_user)) == NULL) { 243 if ((pw = getpwnam(user->ut_user)) == NULL) 244 continue; 245 if (hide(pw)) 246 continue; 247 pn = enter_person(pw); 248 } 249 enter_where(user, pn); 250 } 251 endutxent(); 252 if (db && lflag) 253 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 254 PERSON *tmp; 255 256 r = (*db->seq)(db, &key, &data, sflag1); 257 if (r == -1) 258 err(1, "db seq"); 259 if (r == 1) 260 break; 261 memmove(&tmp, data.data, sizeof tmp); 262 enter_lastlog(tmp); 263 } 264 } 265 266 static void 267 userlist(int argc, char **argv) 268 { 269 PERSON *pn; 270 DBT data, key; 271 struct utmpx *user; 272 struct passwd *pw; 273 int r, sflag1, *used, *ip; 274 char **ap, **nargv, **np, **p; 275 FILE *conf_fp; 276 char conf_alias[LINE_MAX]; 277 char *conf_realname; 278 int conf_length; 279 280 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL || 281 (used = calloc(argc, sizeof(int))) == NULL) 282 err(1, NULL); 283 284 /* Pull out all network requests. */ 285 for (ap = p = argv, np = nargv; *p; ++p) 286 if (index(*p, '@')) 287 *np++ = *p; 288 else 289 *ap++ = *p; 290 291 *np++ = NULL; 292 *ap++ = NULL; 293 294 if (!*argv) 295 goto net; 296 297 /* 298 * Mark any arguments beginning with '/' as invalid so that we 299 * don't accidently confuse them with expansions from finger.conf 300 */ 301 for (p = argv, ip = used; *p; ++p, ++ip) 302 if (**p == '/') { 303 *ip = 1; 304 warnx("%s: no such user", *p); 305 } 306 307 /* 308 * Traverse the finger alias configuration file of the form 309 * alias:(user|alias), ignoring comment lines beginning '#'. 310 */ 311 if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) { 312 while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) { 313 conf_length = strlen(conf_alias); 314 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n') 315 continue; 316 conf_alias[conf_length] = '\0'; /* Remove trailing LF */ 317 if ((conf_realname = strchr(conf_alias, ':')) == NULL) 318 continue; 319 *conf_realname = '\0'; /* Replace : with NUL */ 320 for (p = argv; *p; ++p) { 321 if (strcmp(*p, conf_alias) == 0) { 322 if ((*p = strdup(conf_realname+1)) == NULL) { 323 err(1, NULL); 324 } 325 } 326 } 327 } 328 (void)fclose(conf_fp); 329 } 330 331 /* 332 * Traverse the list of possible login names and check the login name 333 * and real name against the name specified by the user. If the name 334 * begins with a '/', try to read the file of that name instead of 335 * gathering the traditional finger information. 336 */ 337 if (mflag) 338 for (p = argv, ip = used; *p; ++p, ++ip) { 339 if (**p != '/' || *ip == 1 || !show_text("", *p, "")) { 340 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 341 enter_person(pw); 342 else if (!*ip) 343 warnx("%s: no such user", *p); 344 } 345 } 346 else { 347 while ((pw = getpwent()) != NULL) { 348 for (p = argv, ip = used; *p; ++p, ++ip) 349 if (**p == '/' && *ip != 1 350 && show_text("", *p, "")) 351 *ip = 1; 352 else if (match(pw, *p) && !hide(pw)) { 353 enter_person(pw); 354 *ip = 1; 355 } 356 } 357 for (p = argv, ip = used; *p; ++p, ++ip) 358 if (!*ip) 359 warnx("%s: no such user", *p); 360 } 361 362 /* Handle network requests. */ 363 net: for (p = nargv; *p;) { 364 netfinger(*p++); 365 if (*p || entries) 366 printf("\n"); 367 } 368 369 free(used); 370 if (entries == 0) 371 return; 372 373 if (kflag) 374 return; 375 376 /* 377 * Scan thru the list of users currently logged in, saving 378 * appropriate data whenever a match occurs. 379 */ 380 setutxent(); 381 while ((user = getutxent()) != NULL) { 382 if (user->ut_type != USER_PROCESS) 383 continue; 384 if ((pn = find_person(user->ut_user)) == NULL) 385 continue; 386 enter_where(user, pn); 387 } 388 endutxent(); 389 if (db) 390 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 391 PERSON *tmp; 392 393 r = (*db->seq)(db, &key, &data, sflag1); 394 if (r == -1) 395 err(1, "db seq"); 396 if (r == 1) 397 break; 398 memmove(&tmp, data.data, sizeof tmp); 399 enter_lastlog(tmp); 400 } 401 } 402