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 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)finger.c 8.5 (Berkeley) 5/4/95 38 * $FreeBSD: src/usr.bin/finger/finger.c,v 1.15.2.9 2002/07/29 18:52:52 ume Exp $ 39 * $DragonFly: src/usr.bin/finger/finger.c,v 1.3 2003/10/04 20:36:44 hmp Exp $ 40 */ 41 42 /* 43 * Luke Mewburn <lm@rmit.edu.au> added the following on 940622: 44 * - mail status ("No Mail", "Mail read:...", or "New Mail ..., 45 * Unread since ...".) 46 * - 4 digit phone extensions (3210 is printed as x3210.) 47 * - host/office toggling in short format with -h & -o. 48 * - short day names (`Tue' printed instead of `Jun 21' if the 49 * login time is < 6 days. 50 */ 51 52 /* 53 * Finger prints out information about users. It is not portable since 54 * certain fields (e.g. the full user name, office, and phone numbers) are 55 * extracted from the gecos field of the passwd file which other UNIXes 56 * may not have or may use for other things. 57 * 58 * There are currently two output formats; the short format is one line 59 * per user and displays login name, tty, login time, real name, idle time, 60 * and either remote host information (default) or office location/phone 61 * number, depending on if -h or -o is used respectively. 62 * The long format gives the same information (in a more legible format) as 63 * well as home directory, shell, mail info, and .plan/.project files. 64 */ 65 66 #include <sys/types.h> 67 #include <sys/socket.h> 68 #include <db.h> 69 #include <err.h> 70 #include <pwd.h> 71 #include <stdio.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <time.h> 75 #include <unistd.h> 76 #include <utmp.h> 77 #include <locale.h> 78 79 #include "finger.h" 80 #include "pathnames.h" 81 82 DB *db; 83 time_t now; 84 int entries, gflag, lflag, mflag, pplan, sflag, oflag, Tflag; 85 sa_family_t family = PF_UNSPEC; 86 int d_first = -1; 87 char tbuf[1024]; 88 89 static void loginlist(void); 90 static int option(int, char **); 91 static void usage(void); 92 static void userlist(int, char **); 93 94 static int 95 option(int argc, char **argv) 96 { 97 int ch; 98 99 optind = 1; /* reset getopt */ 100 101 while ((ch = getopt(argc, argv, "46glmpshoT")) != -1) 102 switch(ch) { 103 case '4': 104 family = AF_INET; 105 break; 106 case '6': 107 family = AF_INET6; 108 break; 109 case 'g': 110 gflag = 1; 111 break; 112 case 'l': 113 lflag = 1; /* long format */ 114 break; 115 case 'm': 116 mflag = 1; /* force exact match of names */ 117 break; 118 case 'p': 119 pplan = 1; /* don't show .plan/.project */ 120 break; 121 case 's': 122 sflag = 1; /* short format */ 123 break; 124 case 'h': 125 oflag = 0; /* remote host info */ 126 break; 127 case 'o': 128 oflag = 1; /* office info */ 129 break; 130 case 'T': 131 Tflag = 1; /* disable T/TCP */ 132 break; 133 case '?': 134 default: 135 usage(); 136 } 137 138 return optind; 139 } 140 141 static void 142 usage(void) 143 { 144 (void)fprintf(stderr, "usage: finger [-46lmpshoT] [login ...]\n"); 145 exit(1); 146 } 147 148 int 149 main(int argc, char **argv) 150 { 151 int envargc, argcnt; 152 char *envargv[3]; 153 struct passwd *pw; 154 static char myname[] = "finger"; 155 156 if (getuid() == 0 || geteuid() == 0) { 157 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) { 158 setgid(pw->pw_gid); 159 setuid(pw->pw_uid); 160 } else { 161 setgid(UNPRIV_UGID); 162 setuid(UNPRIV_UGID); 163 } 164 } 165 166 (void) setlocale(LC_ALL, ""); 167 168 /* remove this line to get remote host */ 169 oflag = 1; /* default to old "office" behavior */ 170 171 /* 172 * Process environment variables followed by command line arguments. 173 */ 174 if ((envargv[1] = getenv("FINGER"))) { 175 envargc = 2; 176 envargv[0] = myname; 177 envargv[2] = NULL; 178 (void) option(envargc, envargv); 179 } 180 181 argcnt = option(argc, argv); 182 argc -= argcnt; 183 argv += argcnt; 184 185 (void)time(&now); 186 setpassent(1); 187 if (!*argv) { 188 /* 189 * Assign explicit "small" format if no names given and -l 190 * not selected. Force the -s BEFORE we get names so proper 191 * screening will be done. 192 */ 193 if (!lflag) 194 sflag = 1; /* if -l not explicit, force -s */ 195 loginlist(); 196 if (entries == 0) 197 (void)printf("No one logged on.\n"); 198 } else { 199 userlist(argc, argv); 200 /* 201 * Assign explicit "large" format if names given and -s not 202 * explicitly stated. Force the -l AFTER we get names so any 203 * remote finger attempts specified won't be mishandled. 204 */ 205 if (!sflag) 206 lflag = 1; /* if -s not explicit, force -l */ 207 } 208 if (entries) { 209 if (lflag) 210 lflag_print(); 211 else 212 sflag_print(); 213 } 214 return (0); 215 } 216 217 static void 218 loginlist(void) 219 { 220 PERSON *pn; 221 DBT data, key; 222 struct passwd *pw; 223 struct utmp user; 224 int r, sflag1; 225 char name[UT_NAMESIZE + 1]; 226 227 if (!freopen(_PATH_UTMP, "r", stdin)) 228 err(1, "%s", _PATH_UTMP); 229 name[UT_NAMESIZE] = '\0'; 230 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) { 231 if (!user.ut_name[0]) 232 continue; 233 if ((pn = find_person(user.ut_name)) == NULL) { 234 bcopy(user.ut_name, name, UT_NAMESIZE); 235 if ((pw = getpwnam(name)) == NULL) 236 continue; 237 if (hide(pw)) 238 continue; 239 pn = enter_person(pw); 240 } 241 enter_where(&user, pn); 242 } 243 if (db && lflag) 244 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 245 PERSON *tmp; 246 247 r = (*db->seq)(db, &key, &data, sflag1); 248 if (r == -1) 249 err(1, "db seq"); 250 if (r == 1) 251 break; 252 memmove(&tmp, data.data, sizeof tmp); 253 enter_lastlog(tmp); 254 } 255 } 256 257 static void 258 userlist(int argc, char **argv) 259 { 260 PERSON *pn; 261 DBT data, key; 262 struct utmp user; 263 struct passwd *pw; 264 int r, sflag1, *used, *ip; 265 char **ap, **nargv, **np, **p; 266 FILE *conf_fp; 267 char conf_alias[LINE_MAX]; 268 char *conf_realname; 269 int conf_length; 270 271 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL || 272 (used = calloc(argc, sizeof(int))) == NULL) 273 err(1, NULL); 274 275 /* Pull out all network requests. */ 276 for (ap = p = argv, np = nargv; *p; ++p) 277 if (index(*p, '@')) 278 *np++ = *p; 279 else 280 *ap++ = *p; 281 282 *np++ = NULL; 283 *ap++ = NULL; 284 285 if (!*argv) 286 goto net; 287 288 /* 289 * Mark any arguments beginning with '/' as invalid so that we 290 * don't accidently confuse them with expansions from finger.conf 291 */ 292 for (p = argv, ip = used; *p; ++p, ++ip) 293 if (**p == '/') { 294 *ip = 1; 295 warnx("%s: no such user", *p); 296 } 297 298 /* 299 * Traverse the finger alias configuration file of the form 300 * alias:(user|alias), ignoring comment lines beginning '#'. 301 */ 302 if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) { 303 while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) { 304 conf_length = strlen(conf_alias); 305 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n') 306 continue; 307 conf_alias[conf_length] = '\0'; /* Remove trailing LF */ 308 if ((conf_realname = strchr(conf_alias, ':')) == NULL) 309 continue; 310 *conf_realname = '\0'; /* Replace : with NUL */ 311 for (p = argv; *p; ++p) { 312 if (strcmp(*p, conf_alias) == NULL) { 313 if ((*p = strdup(conf_realname+1)) == NULL) { 314 err(1, NULL); 315 } 316 } 317 } 318 } 319 (void)fclose(conf_fp); 320 } 321 322 /* 323 * Traverse the list of possible login names and check the login name 324 * and real name against the name specified by the user. If the name 325 * begins with a '/', try to read the file of that name instead of 326 * gathering the traditional finger information. 327 */ 328 if (mflag) 329 for (p = argv, ip = used; *p; ++p, ++ip) { 330 if (**p != '/' || *ip == 1 || !show_text("", *p, "")) { 331 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 332 enter_person(pw); 333 else if (!*ip) 334 warnx("%s: no such user", *p); 335 } 336 } 337 else { 338 while ((pw = getpwent()) != NULL) { 339 for (p = argv, ip = used; *p; ++p, ++ip) 340 if (**p == '/' && *ip != 1 341 && show_text("", *p, "")) 342 *ip = 1; 343 else if (match(pw, *p) && !hide(pw)) { 344 enter_person(pw); 345 *ip = 1; 346 } 347 } 348 for (p = argv, ip = used; *p; ++p, ++ip) 349 if (!*ip) 350 warnx("%s: no such user", *p); 351 } 352 353 /* Handle network requests. */ 354 net: for (p = nargv; *p;) { 355 netfinger(*p++); 356 if (*p || entries) 357 printf("\n"); 358 } 359 360 if (entries == 0) 361 return; 362 363 /* 364 * Scan thru the list of users currently logged in, saving 365 * appropriate data whenever a match occurs. 366 */ 367 if (!freopen(_PATH_UTMP, "r", stdin)) 368 err(1, "%s", _PATH_UTMP); 369 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) { 370 if (!user.ut_name[0]) 371 continue; 372 if ((pn = find_person(user.ut_name)) == NULL) 373 continue; 374 enter_where(&user, pn); 375 } 376 if (db) 377 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 378 PERSON *tmp; 379 380 r = (*db->seq)(db, &key, &data, sflag1); 381 if (r == -1) 382 err(1, "db seq"); 383 if (r == 1) 384 break; 385 memmove(&tmp, data.data, sizeof tmp); 386 enter_lastlog(tmp); 387 } 388 } 389