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 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 #ifndef lint 54 #if 0 55 static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95"; 56 #else 57 static const char rcsid[] = 58 "$Id: finger.c,v 1.12 1997/07/02 06:34:48 charnier Exp $"; 59 #endif 60 #endif /* not lint */ 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 <sys/param.h> 77 78 #include <db.h> 79 #include <err.h> 80 #include <errno.h> 81 #include <fcntl.h> 82 #include <pwd.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <time.h> 87 #include <unistd.h> 88 #include <utmp.h> 89 #include <db.h> 90 #include <locale.h> 91 92 #include "finger.h" 93 94 DB *db; 95 time_t now; 96 int entries, lflag, mflag, pplan, sflag, oflag, Tflag; 97 char tbuf[1024]; 98 99 static void loginlist __P((void)); 100 static void usage __P((void)); 101 static void userlist __P((int, char **)); 102 103 int 104 option(argc, argv) 105 int argc; 106 char **argv; 107 { 108 int ch; 109 110 optind = 1; /* reset getopt */ 111 112 while ((ch = getopt(argc, argv, "lmpshoT")) != -1) 113 switch(ch) { 114 case 'l': 115 lflag = 1; /* long format */ 116 break; 117 case 'm': 118 mflag = 1; /* force exact match of names */ 119 break; 120 case 'p': 121 pplan = 1; /* don't show .plan/.project */ 122 break; 123 case 's': 124 sflag = 1; /* short format */ 125 break; 126 case 'h': 127 oflag = 0; /* remote host info */ 128 break; 129 case 'o': 130 oflag = 1; /* office info */ 131 break; 132 case 'T': 133 Tflag = 1; /* disable T/TCP */ 134 break; 135 case '?': 136 default: 137 usage(); 138 } 139 140 return optind; 141 } 142 143 static void 144 usage() 145 { 146 (void)fprintf(stderr, "usage: finger [-lmpshoT] [login ...]\n"); 147 exit(1); 148 } 149 150 int 151 main(argc, argv) 152 int argc; 153 char **argv; 154 { 155 int envargc, argcnt; 156 char *envargv[3]; 157 struct passwd *pw; 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] = "finger"; 180 envargv[2] = NULL; 181 (void) option(envargc, envargv); 182 } 183 184 argcnt = option(argc, argv); 185 argc -= argcnt; 186 argv += argcnt; 187 188 (void)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 (void)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 return (0); 217 } 218 219 static void 220 loginlist() 221 { 222 register PERSON *pn; 223 DBT data, key; 224 struct passwd *pw; 225 struct utmp user; 226 int r, sflag; 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 (sflag = R_FIRST;; sflag = R_NEXT) { 247 PERSON *tmp; 248 249 r = (*db->seq)(db, &key, &data, sflag); 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 register int argc; 262 register char **argv; 263 { 264 register PERSON *pn; 265 DBT data, key; 266 struct utmp user; 267 struct passwd *pw; 268 int r, sflag, *used, *ip; 269 char **ap, **nargv, **np, **p; 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 * Traverse the list of possible login names and check the login name 290 * and real name against the name specified by the user. 291 */ 292 if (mflag) 293 for (p = argv; *p; ++p) 294 if (((pw = getpwnam(*p)) != NULL) && !hide(pw)) 295 enter_person(pw); 296 else 297 warnx("%s: no such user", *p); 298 else { 299 while ((pw = getpwent()) != NULL) { 300 for (p = argv, ip = used; *p; ++p, ++ip) 301 if (match(pw, *p) && !hide(pw)) { 302 enter_person(pw); 303 *ip = 1; 304 } 305 } 306 for (p = argv, ip = used; *p; ++p, ++ip) 307 if (!*ip) 308 warnx("%s: no such user", *p); 309 } 310 311 /* Handle network requests. */ 312 net: for (p = nargv; *p;) { 313 netfinger(*p++); 314 if (*p || entries) 315 printf("\n"); 316 } 317 318 if (entries == 0) 319 return; 320 321 /* 322 * Scan thru the list of users currently logged in, saving 323 * appropriate data whenever a match occurs. 324 */ 325 if (!freopen(_PATH_UTMP, "r", stdin)) 326 err(1, "%s", _PATH_UTMP); 327 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) { 328 if (!user.ut_name[0]) 329 continue; 330 if ((pn = find_person(user.ut_name)) == NULL) 331 continue; 332 enter_where(&user, pn); 333 } 334 if (db) 335 for (sflag = R_FIRST;; sflag = R_NEXT) { 336 PERSON *tmp; 337 338 r = (*db->seq)(db, &key, &data, sflag); 339 if (r == -1) 340 err(1, "db seq"); 341 if (r == 1) 342 break; 343 memmove(&tmp, data.data, sizeof tmp); 344 enter_lastlog(tmp); 345 } 346 } 347