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 48static 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#if 0 54#ifndef lint 55static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95"; 56#endif 57#endif 58 59#include <sys/cdefs.h> 60__FBSDID("$FreeBSD: src/usr.bin/finger/finger.c,v 1.36 2005/09/19 10:11:46 dds Exp $"); 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/types.h> 77#include <sys/socket.h> 78#include <db.h> 79#include <err.h> 80#include <pwd.h> 81#include <stdio.h> 82#include <stdlib.h> 83#include <string.h> 84#include <time.h> 85#include <unistd.h> 86#include <utmpx.h> 87#include <locale.h> 88 89#include "finger.h" 90#include "pathnames.h" 91 92DB *db; 93time_t now; 94int entries, gflag, kflag, lflag, mflag, pplan, sflag, oflag, Tflag; 95sa_family_t family = PF_UNSPEC; 96int d_first = -1; 97char tbuf[1024]; 98int invoker_root = 0; 99 100static void loginlist(void); 101static int option(int, char **); 102static void usage(void); 103static void userlist(int, char **); 104 105static int 106option(int argc, char **argv) 107{ 108 int ch; 109 110 optind = 1; /* reset getopt */ 111 112#ifdef __APPLE__ 113 while ((ch = getopt(argc, argv, "46gklmpsho")) != -1) 114#else 115 while ((ch = getopt(argc, argv, "46gklmpshoT")) != -1) 116#endif 117 switch(ch) { 118 case '4': 119 family = AF_INET; 120 break; 121 case '6': 122 family = AF_INET6; 123 break; 124 case 'g': 125 gflag = 1; 126 break; 127 case 'k': 128 kflag = 1; /* keep going without utmpx */ 129 break; 130 case 'l': 131 lflag = 1; /* long format */ 132 break; 133 case 'm': 134 mflag = 1; /* force exact match of names */ 135 break; 136 case 'p': 137 pplan = 1; /* don't show .plan/.project */ 138 break; 139 case 's': 140 sflag = 1; /* short format */ 141 break; 142 case 'h': 143 oflag = 0; /* remote host info */ 144 break; 145 case 'o': 146 oflag = 1; /* office info */ 147 break; 148#ifndef __APPLE__ 149 case 'T': 150 Tflag = 1; /* disable T/TCP */ 151 break; 152#endif 153 case '?': 154 default: 155 usage(); 156 } 157 158 return optind; 159} 160 161static void 162usage(void) 163{ 164 (void)fprintf(stderr, 165 "usage: finger [-46gklmpshoT] [user ...] [user@host ...]\n"); 166 exit(1); 167} 168 169int 170main(int argc, char **argv) 171{ 172 int envargc, argcnt; 173 char *envargv[3]; 174 struct passwd *pw; 175 static char myname[] = "finger"; 176 177 if (getuid() == 0 || geteuid() == 0) { 178 invoker_root = 1; 179 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) { 180 setgid(pw->pw_gid); 181 setuid(pw->pw_uid); 182 } else { 183 setgid(UNPRIV_UGID); 184 setuid(UNPRIV_UGID); 185 } 186 } 187 188 (void) setlocale(LC_ALL, ""); 189 190 /* remove this line to get remote host */ 191 oflag = 1; /* default to old "office" behavior */ 192 193 /* 194 * Process environment variables followed by command line arguments. 195 */ 196 if ((envargv[1] = getenv("FINGER"))) { 197 envargc = 2; 198 envargv[0] = myname; 199 envargv[2] = NULL; 200 (void) option(envargc, envargv); 201 } 202 203 argcnt = option(argc, argv); 204 argc -= argcnt; 205 argv += argcnt; 206 207 (void)time(&now); 208 setpassent(1); 209 if (!*argv) { 210 /* 211 * Assign explicit "small" format if no names given and -l 212 * not selected. Force the -s BEFORE we get names so proper 213 * screening will be done. 214 */ 215 if (!lflag) 216 sflag = 1; /* if -l not explicit, force -s */ 217 loginlist(); 218 if (entries == 0) 219 (void)printf("No one logged on.\n"); 220 } else { 221 userlist(argc, argv); 222 /* 223 * Assign explicit "large" format if names given and -s not 224 * explicitly stated. Force the -l AFTER we get names so any 225 * remote finger attempts specified won't be mishandled. 226 */ 227 if (!sflag) 228 lflag = 1; /* if -s not explicit, force -l */ 229 } 230 if (entries) { 231 if (lflag) 232 lflag_print(); 233 else 234 sflag_print(); 235 } 236 return (0); 237} 238 239static void 240loginlist(void) 241{ 242 PERSON *pn; 243 DBT data, key; 244 struct passwd *pw; 245 struct utmpx *user; 246 int r, sflag1; 247 char name[_UTX_USERSIZE + 1]; 248 249 if (kflag) 250 errx(1, "can't list logins without reading utmpx"); 251 252 setutxent(); 253 name[_UTX_USERSIZE] = '\0'; 254 while ((user = getutxent()) != NULL) { 255 if (!user->ut_user[0] || user->ut_type != USER_PROCESS) 256 continue; 257 if ((pn = find_person(user->ut_user)) == NULL) { 258 bcopy(user->ut_user, name, _UTX_USERSIZE); 259 if ((pw = getpwnam(name)) == NULL) 260 continue; 261 if (hide(pw)) 262 continue; 263 pn = enter_person(pw); 264 } 265 enter_where(user, pn); 266 } 267 endutxent(); 268 if (db && lflag) 269 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 270 PERSON *tmp; 271 272 r = (*db->seq)(db, &key, &data, sflag1); 273 if (r == -1) 274 err(1, "db seq"); 275 if (r == 1) 276 break; 277 memmove(&tmp, data.data, sizeof tmp); 278 enter_lastlog(tmp); 279 } 280} 281 282static void 283userlist(int argc, char **argv) 284{ 285 PERSON *pn; 286 DBT data, key; 287 struct utmpx *user; 288 struct passwd *pw; 289 int r, sflag1, *used, *ip; 290 char **ap, **nargv, **np, **p; 291 FILE *conf_fp; 292 char conf_alias[LINE_MAX]; 293 char *conf_realname; 294 int conf_length; 295 296 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL || 297 (used = calloc(argc, sizeof(int))) == NULL) 298 err(1, NULL); 299 300 /* Pull out all network requests. */ 301 for (ap = p = argv, np = nargv; *p; ++p) 302 if (index(*p, '@')) 303 *np++ = *p; 304 else 305 *ap++ = *p; 306 307 *np++ = NULL; 308 *ap++ = NULL; 309 310 if (!*argv) 311 goto net; 312 313 /* 314 * Mark any arguments beginning with '/' as invalid so that we 315 * don't accidently confuse them with expansions from finger.conf 316 */ 317 for (p = argv, ip = used; *p; ++p, ++ip) 318 if (**p == '/') { 319 *ip = 1; 320 warnx("%s: no such user", *p); 321 } 322 323 /* 324 * Traverse the finger alias configuration file of the form 325 * alias:(user|alias), ignoring comment lines beginning '#'. 326 */ 327 if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) { 328 while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) { 329 conf_length = strlen(conf_alias); 330 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n') 331 continue; 332 conf_alias[conf_length] = '\0'; /* Remove trailing LF */ 333 if ((conf_realname = strchr(conf_alias, ':')) == NULL) 334 continue; 335 *conf_realname = '\0'; /* Replace : with NUL */ 336 for (p = argv; *p; ++p) { 337 if (strcmp(*p, conf_alias) == 0) { 338 if ((*p = strdup(conf_realname+1)) == NULL) { 339 err(1, NULL); 340 } 341 } 342 } 343 } 344 (void)fclose(conf_fp); 345 } 346 347 /* 348 * Traverse the list of possible login names and check the login name 349 * and real name against the name specified by the user. If the name 350 * begins with a '/', try to read the file of that name instead of 351 * gathering the traditional finger information. 352 */ 353 if (mflag) 354 for (p = argv, ip = used; *p; ++p, ++ip) { 355 if (**p != '/' || *ip == 1 || !show_text("", *p, "")) { 356 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 357 enter_person(pw); 358 else if (!*ip) 359 warnx("%s: no such user", *p); 360 } 361 } 362 else { 363 while ((pw = getpwent()) != NULL) { 364 for (p = argv, ip = used; *p; ++p, ++ip) 365 if (**p == '/' && *ip != 1 366 && show_text("", *p, "")) 367 *ip = 1; 368 else if (match(pw, *p) && !hide(pw)) { 369 enter_person(pw); 370 *ip = 1; 371 } 372 } 373 for (p = argv, ip = used; *p; ++p, ++ip) 374 if (!*ip) 375 warnx("%s: no such user", *p); 376 } 377 378 /* Handle network requests. */ 379net: for (p = nargv; *p;) { 380 netfinger(*p++); 381 if (*p || entries) 382 printf("\n"); 383 } 384 385 if (entries == 0) 386 return; 387 388 if (kflag) 389 return; 390 391 /* 392 * Scan thru the list of users currently logged in, saving 393 * appropriate data whenever a match occurs. 394 */ 395 setutxent(); 396 while ((user = getutxent()) != NULL) { 397 if (!user->ut_user && user->ut_type != USER_PROCESS) 398 continue; 399 if ((pn = find_person(user->ut_user)) == NULL) 400 continue; 401 enter_where(user, pn); 402 } 403 endutxent(); 404 if (db) 405 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 406 PERSON *tmp; 407 408 r = (*db->seq)(db, &key, &data, sflag1); 409 if (r == -1) 410 err(1, "db seq"); 411 if (r == 1) 412 break; 413 memmove(&tmp, data.data, sizeof tmp); 414 enter_lastlog(tmp); 415 } 416} 417