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 #if 0 54 #ifndef lint 55 static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95"; 56 #endif 57 #endif 58 59 #include <sys/cdefs.h> 60 __FBSDID("$FreeBSD$"); 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 <db.h> 77 #include <err.h> 78 #include <pwd.h> 79 #include <stdio.h> 80 #include <stdlib.h> 81 #include <string.h> 82 #include <time.h> 83 #include <unistd.h> 84 #include <utmp.h> 85 #include <locale.h> 86 87 #include "finger.h" 88 #include "pathnames.h" 89 90 DB *db; 91 time_t now; 92 int entries, lflag, mflag, pplan, sflag, oflag, Tflag; 93 int d_first = -1; 94 char tbuf[1024]; 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(argc, argv) 103 int argc; 104 char **argv; 105 { 106 int ch; 107 108 optind = 1; /* reset getopt */ 109 110 while ((ch = getopt(argc, argv, "lmpshoT")) != -1) 111 switch(ch) { 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() 143 { 144 (void)fprintf(stderr, "usage: finger [-lmpshoT] [login ...]\n"); 145 exit(1); 146 } 147 148 int 149 main(argc, argv) 150 int argc; 151 char **argv; 152 { 153 int envargc, argcnt; 154 char *envargv[3]; 155 struct passwd *pw; 156 static char myname[] = "finger"; 157 158 if (getuid() == 0 || geteuid() == 0) { 159 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) { 160 setgid(pw->pw_gid); 161 setuid(pw->pw_uid); 162 } else { 163 setgid(UNPRIV_UGID); 164 setuid(UNPRIV_UGID); 165 } 166 } 167 168 (void) setlocale(LC_ALL, ""); 169 170 /* remove this line to get remote host */ 171 oflag = 1; /* default to old "office" behavior */ 172 173 /* 174 * Process environment variables followed by command line arguments. 175 */ 176 if ((envargv[1] = getenv("FINGER"))) { 177 envargc = 2; 178 envargv[0] = myname; 179 envargv[2] = NULL; 180 (void) option(envargc, envargv); 181 } 182 183 argcnt = option(argc, argv); 184 argc -= argcnt; 185 argv += argcnt; 186 187 (void)time(&now); 188 setpassent(1); 189 if (!*argv) { 190 /* 191 * Assign explicit "small" format if no names given and -l 192 * not selected. Force the -s BEFORE we get names so proper 193 * screening will be done. 194 */ 195 if (!lflag) 196 sflag = 1; /* if -l not explicit, force -s */ 197 loginlist(); 198 if (entries == 0) 199 (void)printf("No one logged on.\n"); 200 } else { 201 userlist(argc, argv); 202 /* 203 * Assign explicit "large" format if names given and -s not 204 * explicitly stated. Force the -l AFTER we get names so any 205 * remote finger attempts specified won't be mishandled. 206 */ 207 if (!sflag) 208 lflag = 1; /* if -s not explicit, force -l */ 209 } 210 if (entries) { 211 if (lflag) 212 lflag_print(); 213 else 214 sflag_print(); 215 } 216 return (0); 217 } 218 219 static void 220 loginlist() 221 { 222 PERSON *pn; 223 DBT data, key; 224 struct passwd *pw; 225 struct utmp user; 226 int r, sflag1; 227 char name[UT_NAMESIZE + 1]; 228 229 if (!freopen(_PATH_UTMP, "r", stdin)) 230 err(1, "%s", _PATH_UTMP); 231 name[UT_NAMESIZE] = '\0'; 232 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) { 233 if (!user.ut_name[0]) 234 continue; 235 if ((pn = find_person(user.ut_name)) == NULL) { 236 bcopy(user.ut_name, name, UT_NAMESIZE); 237 if ((pw = getpwnam(name)) == NULL) 238 continue; 239 if (hide(pw)) 240 continue; 241 pn = enter_person(pw); 242 } 243 enter_where(&user, pn); 244 } 245 if (db && lflag) 246 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 247 PERSON *tmp; 248 249 r = (*db->seq)(db, &key, &data, sflag1); 250 if (r == -1) 251 err(1, "db seq"); 252 if (r == 1) 253 break; 254 memmove(&tmp, data.data, sizeof tmp); 255 enter_lastlog(tmp); 256 } 257 } 258 259 static void 260 userlist(argc, argv) 261 int argc; 262 char **argv; 263 { 264 PERSON *pn; 265 DBT data, key; 266 struct utmp user; 267 struct passwd *pw; 268 int r, sflag1, *used, *ip; 269 char **ap, **nargv, **np, **p; 270 FILE *conf_fp; 271 char conf_alias[LINE_MAX]; 272 char *conf_realname; 273 int conf_length; 274 275 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL || 276 (used = calloc(argc, sizeof(int))) == NULL) 277 err(1, NULL); 278 279 /* Pull out all network requests. */ 280 for (ap = p = argv, np = nargv; *p; ++p) 281 if (index(*p, '@')) 282 *np++ = *p; 283 else 284 *ap++ = *p; 285 286 *np++ = NULL; 287 *ap++ = NULL; 288 289 if (!*argv) 290 goto net; 291 292 /* 293 * Mark any arguments beginning with '/' as invalid so that we 294 * don't accidently confuse them with expansions from finger.conf 295 */ 296 for (p = argv, ip = used; *p; ++p, ++ip) 297 if (**p == '/') { 298 *ip = 1; 299 warnx("%s: no such user", *p); 300 } 301 302 /* 303 * Traverse the finger alias configuration file of the form 304 * alias:(user|alias), ignoring comment lines beginning '#'. 305 */ 306 if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) { 307 while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) { 308 conf_length = strlen(conf_alias); 309 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n') 310 continue; 311 conf_alias[conf_length] = '\0'; /* Remove trailing LF */ 312 if ((conf_realname = strchr(conf_alias, ':')) == NULL) 313 continue; 314 *conf_realname = '\0'; /* Replace : with NUL */ 315 for (p = argv; *p; ++p) { 316 if (strcmp(*p, conf_alias) == NULL) { 317 if ((*p = strdup(conf_realname+1)) == NULL) { 318 err(1, NULL); 319 } 320 } 321 } 322 } 323 (void)fclose(conf_fp); 324 } 325 326 /* 327 * Traverse the list of possible login names and check the login name 328 * and real name against the name specified by the user. If the name 329 * begins with a '/', try to read the file of that name instead of 330 * gathering the traditional finger information. 331 */ 332 if (mflag) 333 for (p = argv, ip = used; *p; ++p, ++ip) { 334 if (**p != '/' || *ip == 1 || !show_text("", *p, "")) { 335 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 336 enter_person(pw); 337 else if (!*ip) 338 warnx("%s: no such user", *p); 339 } 340 } 341 else { 342 while ((pw = getpwent()) != NULL) { 343 for (p = argv, ip = used; *p; ++p, ++ip) 344 if (**p == '/' && *ip != 1 345 && show_text("", *p, "")) 346 *ip = 1; 347 else if (match(pw, *p) && !hide(pw)) { 348 enter_person(pw); 349 *ip = 1; 350 } 351 } 352 for (p = argv, ip = used; *p; ++p, ++ip) 353 if (!*ip) 354 warnx("%s: no such user", *p); 355 } 356 357 /* Handle network requests. */ 358 net: for (p = nargv; *p;) { 359 netfinger(*p++); 360 if (*p || entries) 361 printf("\n"); 362 } 363 364 if (entries == 0) 365 return; 366 367 /* 368 * Scan thru the list of users currently logged in, saving 369 * appropriate data whenever a match occurs. 370 */ 371 if (!freopen(_PATH_UTMP, "r", stdin)) 372 err(1, "%s", _PATH_UTMP); 373 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) { 374 if (!user.ut_name[0]) 375 continue; 376 if ((pn = find_person(user.ut_name)) == NULL) 377 continue; 378 enter_where(&user, pn); 379 } 380 if (db) 381 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 382 PERSON *tmp; 383 384 r = (*db->seq)(db, &key, &data, sflag1); 385 if (r == -1) 386 err(1, "db seq"); 387 if (r == 1) 388 break; 389 memmove(&tmp, data.data, sizeof tmp); 390 enter_lastlog(tmp); 391 } 392 } 393