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