1 /* $OpenBSD: util.c,v 1.32 2015/12/26 20:51:35 guenther Exp $ */ 2 3 /* 4 * Copyright (c) 1989 The Regents of the University of California. 5 * All rights reserved. 6 * Portions Copyright (c) 1983, 1995, 1996 Eric P. Allman (woof!) 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 #include <sys/uio.h> 38 #include <sys/stat.h> 39 #include <err.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <ctype.h> 43 #include <string.h> 44 #include <paths.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <unistd.h> 48 #include <vis.h> 49 #include "finger.h" 50 #include "extern.h" 51 52 char *estrdup(char *); 53 WHERE *walloc(PERSON *pn); 54 void find_idle_and_ttywrite(WHERE *); 55 void userinfo(PERSON *, struct passwd *); 56 57 void 58 find_idle_and_ttywrite(WHERE *w) 59 { 60 struct stat sb; 61 62 (void)snprintf(tbuf, sizeof(tbuf), "%s%s", _PATH_DEV, w->tty); 63 if (stat(tbuf, &sb) < 0) { 64 /* Don't bitch about it, just handle it... */ 65 w->idletime = 0; 66 w->writable = 0; 67 68 return; 69 } 70 w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime; 71 72 #define TALKABLE 0220 /* tty is writable if 220 mode */ 73 w->writable = ((sb.st_mode & TALKABLE) == TALKABLE); 74 } 75 76 char * 77 estrdup(char *s) 78 { 79 char *p = strdup(s); 80 if (!p) 81 err(1, "strdup"); 82 return (p); 83 } 84 85 void 86 userinfo(PERSON *pn, struct passwd *pw) 87 { 88 char *p; 89 char *bp, name[1024]; 90 struct stat sb; 91 int len; 92 93 pn->realname = pn->office = pn->officephone = pn->homephone = NULL; 94 pn->mailrecv = -1; /* -1 == not_valid */ 95 96 pn->uid = pw->pw_uid; 97 pn->name = estrdup(pw->pw_name); 98 pn->dir = estrdup(pw->pw_dir); 99 pn->shell = estrdup(pw->pw_shell); 100 101 (void)strlcpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf)); 102 103 /* ampersands get replaced by the login name */ 104 if (!(p = strsep(&bp, ","))) 105 return; 106 expandusername(p, pw->pw_name, name, sizeof(name)); 107 if (stravis(&pn->realname, p, VIS_SAFE|VIS_NOSLASH) == -1) 108 err(1, "stravis"); 109 if ((p = strsep(&bp, ",")) && *p) { 110 if (stravis(&pn->office, p, VIS_SAFE|VIS_NOSLASH) == -1) 111 err(1, "stravis"); 112 } 113 if ((p = strsep(&bp, ",")) && *p) { 114 if (stravis(&pn->officephone, p, VIS_SAFE|VIS_NOSLASH) == -1) 115 err(1, "stravis"); 116 } 117 if ((p = strsep(&bp, ",")) && *p) { 118 if (stravis(&pn->homephone, p, VIS_SAFE|VIS_NOSLASH) == -1) 119 err(1, "stravis"); 120 } 121 len = snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILSPOOL, 122 pw->pw_name); 123 if (len != -1 && len < sizeof(tbuf)) { 124 if (stat(tbuf, &sb) < 0) { 125 if (errno != ENOENT) { 126 warn("%s", tbuf); 127 return; 128 } 129 } else if (sb.st_size != 0) { 130 pn->mailrecv = sb.st_mtime; 131 pn->mailread = sb.st_atime; 132 } 133 } 134 } 135 136 int 137 match(struct passwd *pw, char *user) 138 { 139 char *p, *t; 140 char name[1024]; 141 142 (void)strlcpy(p = tbuf, pw->pw_gecos, sizeof(tbuf)); 143 144 /* ampersands get replaced by the login name */ 145 if (!(p = strtok(p, ","))) 146 return (0); 147 expandusername(p, pw->pw_name, name, sizeof(name)); 148 for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL) 149 if (!strcasecmp(p, user)) 150 return (1); 151 return (0); 152 } 153 154 /* inspired by usr.sbin/sendmail/util.c::buildfname */ 155 void 156 expandusername(char *gecos, char *login, char *buf, int buflen) 157 { 158 char *p, *bp; 159 160 /* why do we skip asterisks!?!? */ 161 if (*gecos == '*') 162 gecos++; 163 bp = buf; 164 165 /* copy gecos, interpolating & to be full name */ 166 for (p = gecos; *p != '\0'; p++) { 167 if (bp >= &buf[buflen - 1]) { 168 /* buffer overflow - just use login name */ 169 strlcpy(buf, login, buflen); 170 buf[buflen - 1] = '\0'; 171 return; 172 } 173 if (*p == '&') { 174 /* interpolate full name */ 175 strlcpy(bp, login, buflen - (bp - buf)); 176 *bp = toupper((unsigned char)*bp); 177 bp += strlen(bp); 178 } 179 else 180 *bp++ = *p; 181 } 182 *bp = '\0'; 183 } 184 185 void 186 enter_lastlog(PERSON *pn) 187 { 188 WHERE *w; 189 static int opened, fd; 190 struct lastlog ll; 191 char doit = 0; 192 193 /* some systems may not maintain lastlog, don't report errors. */ 194 if (!opened) { 195 fd = open(_PATH_LASTLOG, O_RDONLY); 196 opened = 1; 197 } 198 if (fd == -1 || 199 pread(fd, &ll, sizeof(ll), (off_t)pn->uid * sizeof(ll)) != 200 sizeof(ll)) { 201 /* as if never logged in */ 202 ll.ll_line[0] = ll.ll_host[0] = '\0'; 203 ll.ll_time = 0; 204 } 205 if ((w = pn->whead) == NULL) 206 doit = 1; 207 else if (ll.ll_time != 0) { 208 /* if last login is earlier than some current login */ 209 for (; !doit && w != NULL; w = w->next) 210 if (w->info == LOGGEDIN && w->loginat < ll.ll_time) 211 doit = 1; 212 /* 213 * and if it's not any of the current logins 214 * can't use time comparison because there may be a small 215 * discrepency since login calls time() twice 216 */ 217 for (w = pn->whead; doit && w != NULL; w = w->next) 218 if (w->info == LOGGEDIN && 219 strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0) 220 doit = 0; 221 } 222 if (doit) { 223 w = walloc(pn); 224 w->info = LASTLOG; 225 bcopy(ll.ll_line, w->tty, UT_LINESIZE); 226 w->tty[UT_LINESIZE] = 0; 227 bcopy(ll.ll_host, w->host, UT_HOSTSIZE); 228 w->host[UT_HOSTSIZE] = 0; 229 w->loginat = ll.ll_time; 230 } 231 } 232 233 void 234 enter_where(struct utmp *ut, PERSON *pn) 235 { 236 WHERE *w = walloc(pn); 237 238 w->info = LOGGEDIN; 239 bcopy(ut->ut_line, w->tty, UT_LINESIZE); 240 w->tty[UT_LINESIZE] = 0; 241 bcopy(ut->ut_host, w->host, UT_HOSTSIZE); 242 w->host[UT_HOSTSIZE] = 0; 243 w->loginat = (time_t)ut->ut_time; 244 find_idle_and_ttywrite(w); 245 } 246 247 PERSON * 248 enter_person(struct passwd *pw) 249 { 250 PERSON *pn, **pp; 251 252 for (pp = htab + hash(pw->pw_name); 253 *pp != NULL && strcmp((*pp)->name, pw->pw_name) != 0; 254 pp = &(*pp)->hlink) 255 ; 256 if ((pn = *pp) == NULL) { 257 pn = palloc(); 258 entries++; 259 if (phead == NULL) 260 phead = ptail = pn; 261 else { 262 ptail->next = pn; 263 ptail = pn; 264 } 265 pn->next = NULL; 266 pn->hlink = NULL; 267 *pp = pn; 268 userinfo(pn, pw); 269 pn->whead = NULL; 270 } 271 return (pn); 272 } 273 274 PERSON * 275 find_person(char *name) 276 { 277 PERSON *pn; 278 279 /* name may be only UT_NAMESIZE long and not terminated */ 280 for (pn = htab[hash(name)]; 281 pn != NULL && strncmp(pn->name, name, UT_NAMESIZE) != 0; 282 pn = pn->hlink) 283 ; 284 return (pn); 285 } 286 287 int 288 hash(char *name) 289 { 290 int h, i; 291 292 h = 0; 293 /* name may be only UT_NAMESIZE long and not terminated */ 294 for (i = UT_NAMESIZE; --i >= 0 && *name;) 295 h = ((h << 2 | h >> (HBITS - 2)) ^ *name++) & HMASK; 296 return (h); 297 } 298 299 PERSON * 300 palloc(void) 301 { 302 PERSON *p; 303 304 if ((p = malloc((u_int) sizeof(PERSON))) == NULL) 305 err(1, "malloc"); 306 return (p); 307 } 308 309 WHERE * 310 walloc(PERSON *pn) 311 { 312 WHERE *w; 313 314 if ((w = malloc((u_int) sizeof(WHERE))) == NULL) 315 err(1, "malloc"); 316 if (pn->whead == NULL) 317 pn->whead = pn->wtail = w; 318 else { 319 pn->wtail->next = w; 320 pn->wtail = w; 321 } 322 w->next = NULL; 323 return (w); 324 } 325 326 char * 327 prphone(char *num) 328 { 329 char *p; 330 int len; 331 static char pbuf[15]; 332 333 /* don't touch anything if the user has their own formatting */ 334 for (p = num; *p; ++p) 335 if (!isdigit((unsigned char)*p)) 336 return (num); 337 len = p - num; 338 p = pbuf; 339 switch (len) { 340 case 11: /* +0-123-456-7890 */ 341 *p++ = '+'; 342 *p++ = *num++; 343 *p++ = '-'; 344 /* FALLTHROUGH */ 345 case 10: /* 012-345-6789 */ 346 *p++ = *num++; 347 *p++ = *num++; 348 *p++ = *num++; 349 *p++ = '-'; 350 /* FALLTHROUGH */ 351 case 7: /* 012-3456 */ 352 *p++ = *num++; 353 *p++ = *num++; 354 *p++ = *num++; 355 break; 356 case 5: /* x0-1234 */ 357 case 4: /* x1234 */ 358 *p++ = 'x'; 359 *p++ = *num++; 360 break; 361 default: 362 return (num); 363 } 364 if (len != 4) { 365 *p++ = '-'; 366 *p++ = *num++; 367 } 368 *p++ = *num++; 369 *p++ = *num++; 370 *p++ = *num++; 371 *p = '\0'; 372 return (pbuf); 373 } 374