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. 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 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 33 * @(#)finger.c 8.5 (Berkeley) 5/4/95 34 * $FreeBSD: src/usr.bin/finger/finger.c,v 1.15.2.9 2002/07/29 18:52:52 ume Exp $ 35 * $DragonFly: src/usr.bin/finger/finger.c,v 1.6 2008/06/05 18:06:33 swildner Exp $ 36 */ 37 38 /* 39 * Luke Mewburn <lm@rmit.edu.au> added the following on 940622: 40 * - mail status ("No Mail", "Mail read:...", or "New Mail ..., 41 * Unread since ...".) 42 * - 4 digit phone extensions (3210 is printed as x3210.) 43 * - host/office toggling in short format with -h & -o. 44 * - short day names (`Tue' printed instead of `Jun 21' if the 45 * login time is < 6 days. 46 */ 47 48 /* 49 * Finger prints out information about users. It is not portable since 50 * certain fields (e.g. the full user name, office, and phone numbers) are 51 * extracted from the gecos field of the passwd file which other UNIXes 52 * may not have or may use for other things. 53 * 54 * There are currently two output formats; the short format is one line 55 * per user and displays login name, tty, login time, real name, idle time, 56 * and either remote host information (default) or office location/phone 57 * number, depending on if -h or -o is used respectively. 58 * The long format gives the same information (in a more legible format) as 59 * well as home directory, shell, mail info, and .plan/.project files. 60 */ 61 62 #include <sys/types.h> 63 #include <sys/socket.h> 64 #include <db.h> 65 #include <err.h> 66 #include <pwd.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <time.h> 71 #include <unistd.h> 72 #include "utmpentry.h" 73 #include <locale.h> 74 75 #include "finger.h" 76 #include "pathnames.h" 77 78 DB *db; 79 time_t now; 80 int entries, gflag, lflag, mflag, pplan, sflag, oflag, Tflag, eightflag; 81 sa_family_t family = PF_UNSPEC; 82 int d_first = -1; 83 char tbuf[1024]; 84 85 static void loginlist(void); 86 static int option(int, char **); 87 static void usage(void); 88 static void userlist(int, char **); 89 90 static int 91 option(int argc, char **argv) 92 { 93 int ch; 94 95 optind = 1; /* reset getopt */ 96 97 while ((ch = getopt(argc, argv, "468glmpshoT")) != -1) 98 switch(ch) { 99 case '4': 100 family = AF_INET; 101 break; 102 case '6': 103 family = AF_INET6; 104 break; 105 case '8': 106 eightflag = 1; /* allow 8-bit passthrough */ 107 break; 108 case 'g': 109 gflag = 1; 110 break; 111 case 'l': 112 lflag = 1; /* long format */ 113 break; 114 case 'm': 115 mflag = 1; /* force exact match of names */ 116 break; 117 case 'p': 118 pplan = 1; /* don't show .plan/.project */ 119 break; 120 case 's': 121 sflag = 1; /* short format */ 122 break; 123 case 'h': 124 oflag = 0; /* remote host info */ 125 break; 126 case 'o': 127 oflag = 1; /* office info */ 128 break; 129 case 'T': 130 Tflag = 1; /* disable T/TCP */ 131 break; 132 case '?': 133 default: 134 usage(); 135 } 136 137 return optind; 138 } 139 140 static void 141 usage(void) 142 { 143 fprintf(stderr, "usage: finger [-468lmpshoT] [login ...]\n"); 144 exit(1); 145 } 146 147 int 148 main(int argc, char **argv) 149 { 150 int envargc, argcnt; 151 char *envargv[3]; 152 struct passwd *pw; 153 static char myname[] = "finger"; 154 155 if (getuid() == 0 || geteuid() == 0) { 156 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) { 157 setgid(pw->pw_gid); 158 setuid(pw->pw_uid); 159 } else { 160 setgid(UNPRIV_UGID); 161 setuid(UNPRIV_UGID); 162 } 163 } 164 165 (void) setlocale(LC_ALL, ""); 166 167 /* remove this line to get remote host */ 168 oflag = 1; /* default to old "office" behavior */ 169 170 /* 171 * Process environment variables followed by command line arguments. 172 */ 173 if ((envargv[1] = getenv("FINGER"))) { 174 envargc = 2; 175 envargv[0] = myname; 176 envargv[2] = NULL; 177 option(envargc, envargv); 178 } 179 180 argcnt = option(argc, argv); 181 argc -= argcnt; 182 argv += argcnt; 183 184 time(&now); 185 setpassent(1); 186 if (!*argv) { 187 /* 188 * Assign explicit "small" format if no names given and -l 189 * not selected. Force the -s BEFORE we get names so proper 190 * screening will be done. 191 */ 192 if (!lflag) 193 sflag = 1; /* if -l not explicit, force -s */ 194 loginlist(); 195 if (entries == 0) 196 printf("No one logged on.\n"); 197 } else { 198 userlist(argc, argv); 199 /* 200 * Assign explicit "large" format if names given and -s not 201 * explicitly stated. Force the -l AFTER we get names so any 202 * remote finger attempts specified won't be mishandled. 203 */ 204 if (!sflag) 205 lflag = 1; /* if -s not explicit, force -l */ 206 } 207 if (entries) { 208 if (lflag) 209 lflag_print(); 210 else 211 sflag_print(); 212 } 213 return (0); 214 } 215 216 static void 217 loginlist(void) 218 { 219 PERSON *pn; 220 DBT data, key; 221 struct passwd *pw; 222 struct utmpentry *ep; 223 int r, sflag1; 224 225 getutentries(NULL, &ep); 226 for (; ep; ep = ep->next) { 227 if ((pn = find_person(ep->name)) == NULL) { 228 if ((pw = getpwnam(ep->name)) == NULL) 229 continue; 230 if (hide(pw)) 231 continue; 232 pn = enter_person(pw); 233 } 234 enter_where(ep, pn); 235 } 236 if (db && lflag) 237 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 238 PERSON *tmp; 239 240 r = (*db->seq)(db, &key, &data, sflag1); 241 if (r == -1) 242 err(1, "db seq"); 243 if (r == 1) 244 break; 245 memmove(&tmp, data.data, sizeof tmp); 246 enter_lastlog(tmp); 247 } 248 } 249 250 static void 251 userlist(int argc, char **argv) 252 { 253 PERSON *pn; 254 DBT data, key; 255 struct utmpentry *ep; 256 struct passwd *pw; 257 int r, sflag1, *used, *ip; 258 char **ap, **nargv, **np, **p; 259 FILE *conf_fp; 260 char conf_alias[LINE_MAX]; 261 char *conf_realname; 262 int conf_length; 263 264 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL || 265 (used = calloc(argc, sizeof(int))) == NULL) 266 err(1, NULL); 267 268 /* Pull out all network requests. */ 269 for (ap = p = argv, np = nargv; *p; ++p) 270 if (strchr(*p, '@')) 271 *np++ = *p; 272 else 273 *ap++ = *p; 274 275 *np++ = NULL; 276 *ap++ = NULL; 277 278 if (!*argv) 279 goto net; 280 281 /* 282 * Mark any arguments beginning with '/' as invalid so that we 283 * don't accidently confuse them with expansions from finger.conf 284 */ 285 for (p = argv, ip = used; *p; ++p, ++ip) 286 if (**p == '/') { 287 *ip = 1; 288 warnx("%s: no such user", *p); 289 } 290 291 /* 292 * Traverse the finger alias configuration file of the form 293 * alias:(user|alias), ignoring comment lines beginning '#'. 294 */ 295 if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) { 296 while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) { 297 conf_length = strlen(conf_alias); 298 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n') 299 continue; 300 conf_alias[conf_length] = '\0'; /* Remove trailing LF */ 301 if ((conf_realname = strchr(conf_alias, ':')) == NULL) 302 continue; 303 *conf_realname = '\0'; /* Replace : with NUL */ 304 for (p = argv; *p; ++p) { 305 if (strcmp(*p, conf_alias) == 0) { 306 if ((*p = strdup(conf_realname+1)) == NULL) { 307 err(1, NULL); 308 } 309 } 310 } 311 } 312 fclose(conf_fp); 313 } 314 315 /* 316 * Traverse the list of possible login names and check the login name 317 * and real name against the name specified by the user. If the name 318 * begins with a '/', try to read the file of that name instead of 319 * gathering the traditional finger information. 320 */ 321 if (mflag) 322 for (p = argv, ip = used; *p; ++p, ++ip) { 323 if (**p != '/' || *ip == 1 || !show_text("", *p, "")) { 324 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 325 enter_person(pw); 326 else if (!*ip) 327 warnx("%s: no such user", *p); 328 } 329 } 330 else { 331 while ((pw = getpwent()) != NULL) { 332 for (p = argv, ip = used; *p; ++p, ++ip) 333 if (**p == '/' && *ip != 1 334 && show_text("", *p, "")) 335 *ip = 1; 336 else if (match(pw, *p) && !hide(pw)) { 337 enter_person(pw); 338 *ip = 1; 339 } 340 } 341 for (p = argv, ip = used; *p; ++p, ++ip) 342 if (!*ip) 343 warnx("%s: no such user", *p); 344 } 345 346 /* Handle network requests. */ 347 net: for (p = nargv; *p;) { 348 netfinger(*p++); 349 if (*p || entries) 350 printf("\n"); 351 } 352 353 if (entries == 0) 354 return; 355 356 /* 357 * Scan thru the list of users currently logged in, saving 358 * appropriate data whenever a match occurs. 359 */ 360 getutentries(NULL, &ep); 361 for (; ep; ep = ep->next) { 362 if ((pn = find_person(ep->name)) == NULL) 363 continue; 364 enter_where(ep, pn); 365 } 366 if (db) 367 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) { 368 PERSON *tmp; 369 370 r = (*db->seq)(db, &key, &data, sflag1); 371 if (r == -1) 372 err(1, "db seq"); 373 if (r == 1) 374 break; 375 memmove(&tmp, data.data, sizeof tmp); 376 enter_lastlog(tmp); 377 } 378 } 379