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 1.6 2008/06/05 18:06:33 swildner 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 "utmpentry.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, eightflag; 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, "468glmpshoT")) != -1) 102 switch(ch) { 103 case '4': 104 family = AF_INET; 105 break; 106 case '6': 107 family = AF_INET6; 108 break; 109 case '8': 110 eightflag = 1; /* allow 8-bit passthrough */ 111 break; 112 case 'g': 113 gflag = 1; 114 break; 115 case 'l': 116 lflag = 1; /* long format */ 117 break; 118 case 'm': 119 mflag = 1; /* force exact match of names */ 120 break; 121 case 'p': 122 pplan = 1; /* don't show .plan/.project */ 123 break; 124 case 's': 125 sflag = 1; /* short format */ 126 break; 127 case 'h': 128 oflag = 0; /* remote host info */ 129 break; 130 case 'o': 131 oflag = 1; /* office info */ 132 break; 133 case 'T': 134 Tflag = 1; /* disable T/TCP */ 135 break; 136 case '?': 137 default: 138 usage(); 139 } 140 141 return optind; 142 } 143 144 static void 145 usage(void) 146 { 147 fprintf(stderr, "usage: finger [-468lmpshoT] [login ...]\n"); 148 exit(1); 149 } 150 151 int 152 main(int argc, char **argv) 153 { 154 int envargc, argcnt; 155 char *envargv[3]; 156 struct passwd *pw; 157 static char myname[] = "finger"; 158 159 if (getuid() == 0 || geteuid() == 0) { 160 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) { 161 setgid(pw->pw_gid); 162 setuid(pw->pw_uid); 163 } else { 164 setgid(UNPRIV_UGID); 165 setuid(UNPRIV_UGID); 166 } 167 } 168 169 (void) setlocale(LC_ALL, ""); 170 171 /* remove this line to get remote host */ 172 oflag = 1; /* default to old "office" behavior */ 173 174 /* 175 * Process environment variables followed by command line arguments. 176 */ 177 if ((envargv[1] = getenv("FINGER"))) { 178 envargc = 2; 179 envargv[0] = myname; 180 envargv[2] = NULL; 181 option(envargc, envargv); 182 } 183 184 argcnt = option(argc, argv); 185 argc -= argcnt; 186 argv += argcnt; 187 188 time(&now); 189 setpassent(1); 190 if (!*argv) { 191 /* 192 * Assign explicit "small" format if no names given and -l 193 * not selected. Force the -s BEFORE we get names so proper 194 * screening will be done. 195 */ 196 if (!lflag) 197 sflag = 1; /* if -l not explicit, force -s */ 198 loginlist(); 199 if (entries == 0) 200 printf("No one logged on.\n"); 201 } else { 202 userlist(argc, argv); 203 /* 204 * Assign explicit "large" format if names given and -s not 205 * explicitly stated. Force the -l AFTER we get names so any 206 * remote finger attempts specified won't be mishandled. 207 */ 208 if (!sflag) 209 lflag = 1; /* if -s not explicit, force -l */ 210 } 211 if (entries) { 212 if (lflag) 213 lflag_print(); 214 else 215 sflag_print(); 216 } 217 return (0); 218 } 219 220 static void 221 loginlist(void) 222 { 223 PERSON *pn; 224 DBT data, key; 225 struct passwd *pw; 226 struct utmpentry *ep; 227 int r, sflag1; 228 229 getutentries(NULL, &ep); 230 for (; ep; ep = ep->next) { 231 if ((pn = find_person(ep->name)) == NULL) { 232 if ((pw = getpwnam(ep->name)) == NULL) 233 continue; 234 if (hide(pw)) 235 continue; 236 pn = enter_person(pw); 237 } 238 enter_where(ep, pn); 239 } 240 if (db && lflag) 241 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 242 PERSON *tmp; 243 244 r = (*db->seq)(db, &key, &data, sflag1); 245 if (r == -1) 246 err(1, "db seq"); 247 if (r == 1) 248 break; 249 memmove(&tmp, data.data, sizeof tmp); 250 enter_lastlog(tmp); 251 } 252 } 253 254 static void 255 userlist(int argc, char **argv) 256 { 257 PERSON *pn; 258 DBT data, key; 259 struct utmpentry *ep; 260 struct passwd *pw; 261 int r, sflag1, *used, *ip; 262 char **ap, **nargv, **np, **p; 263 FILE *conf_fp; 264 char conf_alias[LINE_MAX]; 265 char *conf_realname; 266 int conf_length; 267 268 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL || 269 (used = calloc(argc, sizeof(int))) == NULL) 270 err(1, NULL); 271 272 /* Pull out all network requests. */ 273 for (ap = p = argv, np = nargv; *p; ++p) 274 if (strchr(*p, '@')) 275 *np++ = *p; 276 else 277 *ap++ = *p; 278 279 *np++ = NULL; 280 *ap++ = NULL; 281 282 if (!*argv) 283 goto net; 284 285 /* 286 * Mark any arguments beginning with '/' as invalid so that we 287 * don't accidently confuse them with expansions from finger.conf 288 */ 289 for (p = argv, ip = used; *p; ++p, ++ip) 290 if (**p == '/') { 291 *ip = 1; 292 warnx("%s: no such user", *p); 293 } 294 295 /* 296 * Traverse the finger alias configuration file of the form 297 * alias:(user|alias), ignoring comment lines beginning '#'. 298 */ 299 if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) { 300 while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) { 301 conf_length = strlen(conf_alias); 302 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n') 303 continue; 304 conf_alias[conf_length] = '\0'; /* Remove trailing LF */ 305 if ((conf_realname = strchr(conf_alias, ':')) == NULL) 306 continue; 307 *conf_realname = '\0'; /* Replace : with NUL */ 308 for (p = argv; *p; ++p) { 309 if (strcmp(*p, conf_alias) == 0) { 310 if ((*p = strdup(conf_realname+1)) == NULL) { 311 err(1, NULL); 312 } 313 } 314 } 315 } 316 fclose(conf_fp); 317 } 318 319 /* 320 * Traverse the list of possible login names and check the login name 321 * and real name against the name specified by the user. If the name 322 * begins with a '/', try to read the file of that name instead of 323 * gathering the traditional finger information. 324 */ 325 if (mflag) 326 for (p = argv, ip = used; *p; ++p, ++ip) { 327 if (**p != '/' || *ip == 1 || !show_text("", *p, "")) { 328 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 329 enter_person(pw); 330 else if (!*ip) 331 warnx("%s: no such user", *p); 332 } 333 } 334 else { 335 while ((pw = getpwent()) != NULL) { 336 for (p = argv, ip = used; *p; ++p, ++ip) 337 if (**p == '/' && *ip != 1 338 && show_text("", *p, "")) 339 *ip = 1; 340 else if (match(pw, *p) && !hide(pw)) { 341 enter_person(pw); 342 *ip = 1; 343 } 344 } 345 for (p = argv, ip = used; *p; ++p, ++ip) 346 if (!*ip) 347 warnx("%s: no such user", *p); 348 } 349 350 /* Handle network requests. */ 351 net: for (p = nargv; *p;) { 352 netfinger(*p++); 353 if (*p || entries) 354 printf("\n"); 355 } 356 357 if (entries == 0) 358 return; 359 360 /* 361 * Scan thru the list of users currently logged in, saving 362 * appropriate data whenever a match occurs. 363 */ 364 getutentries(NULL, &ep); 365 for (; ep; ep = ep->next) { 366 if ((pn = find_person(ep->name)) == NULL) 367 continue; 368 enter_where(ep, pn); 369 } 370 if (db) 371 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 372 PERSON *tmp; 373 374 r = (*db->seq)(db, &key, &data, sflag1); 375 if (r == -1) 376 err(1, "db seq"); 377 if (r == 1) 378 break; 379 memmove(&tmp, data.data, sizeof tmp); 380 enter_lastlog(tmp); 381 } 382 } 383