1 /* $NetBSD: conf.c,v 1.51 2002/11/29 14:39:59 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1997-2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Simon Burge and Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __RCSID("$NetBSD: conf.c,v 1.51 2002/11/29 14:39:59 lukem Exp $"); 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/socket.h> 47 #include <sys/stat.h> 48 49 #include <ctype.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <glob.h> 53 #include <netdb.h> 54 #include <setjmp.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <stringlist.h> 60 #include <syslog.h> 61 #include <time.h> 62 #include <unistd.h> 63 #include <util.h> 64 65 #ifdef KERBEROS5 66 #include <krb5/krb5.h> 67 #endif 68 69 #include "extern.h" 70 #include "pathnames.h" 71 72 static char *strend(const char *, char *); 73 static int filetypematch(char *, int); 74 75 76 /* class defaults */ 77 #define DEFAULT_LIMIT -1 /* unlimited connections */ 78 #define DEFAULT_MAXFILESIZE -1 /* unlimited file size */ 79 #define DEFAULT_MAXTIMEOUT 7200 /* 2 hours */ 80 #define DEFAULT_TIMEOUT 900 /* 15 minutes */ 81 #define DEFAULT_UMASK 027 /* 15 minutes */ 82 83 /* 84 * Initialise curclass to an `empty' state 85 */ 86 void 87 init_curclass(void) 88 { 89 struct ftpconv *conv, *cnext; 90 91 for (conv = curclass.conversions; conv != NULL; conv = cnext) { 92 REASSIGN(conv->suffix, NULL); 93 REASSIGN(conv->types, NULL); 94 REASSIGN(conv->disable, NULL); 95 REASSIGN(conv->command, NULL); 96 cnext = conv->next; 97 free(conv); 98 } 99 100 memset((char *)&curclass.advertise, 0, sizeof(curclass.advertise)); 101 curclass.advertise.su_len = 0; /* `not used' */ 102 REASSIGN(curclass.chroot, NULL); 103 REASSIGN(curclass.classname, NULL); 104 curclass.conversions = NULL; 105 REASSIGN(curclass.display, NULL); 106 REASSIGN(curclass.homedir, NULL); 107 curclass.limit = DEFAULT_LIMIT; 108 REASSIGN(curclass.limitfile, NULL); 109 curclass.maxfilesize = DEFAULT_MAXFILESIZE; 110 curclass.maxrateget = 0; 111 curclass.maxrateput = 0; 112 curclass.maxtimeout = DEFAULT_MAXTIMEOUT; 113 REASSIGN(curclass.motd, xstrdup(_PATH_FTPLOGINMESG)); 114 REASSIGN(curclass.notify, NULL); 115 curclass.portmin = 0; 116 curclass.portmax = 0; 117 curclass.rateget = 0; 118 curclass.rateput = 0; 119 curclass.timeout = DEFAULT_TIMEOUT; 120 /* curclass.type is set elsewhere */ 121 curclass.umask = DEFAULT_UMASK; 122 curclass.mmapsize = 0; 123 curclass.readsize = 0; 124 curclass.writesize = 0; 125 curclass.sendbufsize = 0; 126 curclass.sendlowat = 0; 127 128 CURCLASS_FLAGS_SET(checkportcmd); 129 CURCLASS_FLAGS_CLR(denyquick); 130 CURCLASS_FLAGS_SET(modify); 131 CURCLASS_FLAGS_SET(passive); 132 CURCLASS_FLAGS_CLR(private); 133 CURCLASS_FLAGS_CLR(sanenames); 134 CURCLASS_FLAGS_SET(upload); 135 } 136 137 /* 138 * Parse the configuration file, looking for the named class, and 139 * define curclass to contain the appropriate settings. 140 */ 141 void 142 parse_conf(const char *findclass) 143 { 144 FILE *f; 145 char *buf, *p; 146 size_t len; 147 LLT llval; 148 int none, match; 149 char *endp, errbuf[100]; 150 char *class, *word, *arg, *template; 151 const char *infile; 152 size_t line; 153 struct ftpconv *conv, *cnext; 154 155 init_curclass(); 156 REASSIGN(curclass.classname, xstrdup(findclass)); 157 /* set more guest defaults */ 158 if (strcasecmp(findclass, "guest") == 0) { 159 CURCLASS_FLAGS_CLR(modify); 160 curclass.umask = 0707; 161 } 162 163 infile = conffilename(_PATH_FTPDCONF); 164 if ((f = fopen(infile, "r")) == NULL) 165 return; 166 167 line = 0; 168 template = NULL; 169 for (; 170 (buf = fparseln(f, &len, &line, NULL, FPARSELN_UNESCCOMM | 171 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 172 free(buf)) { 173 none = match = 0; 174 p = buf; 175 if (len < 1) 176 continue; 177 if (p[len - 1] == '\n') 178 p[--len] = '\0'; 179 if (EMPTYSTR(p)) 180 continue; 181 182 NEXTWORD(p, word); 183 NEXTWORD(p, class); 184 NEXTWORD(p, arg); 185 if (EMPTYSTR(word) || EMPTYSTR(class)) 186 continue; 187 if (strcasecmp(class, "none") == 0) 188 none = 1; 189 if (! (strcasecmp(class, findclass) == 0 || 190 (template != NULL && strcasecmp(class, template) == 0) || 191 none || 192 strcasecmp(class, "all") == 0) ) 193 continue; 194 195 #define CONF_FLAG(Field) \ 196 do { \ 197 if (none || \ 198 (!EMPTYSTR(arg) && strcasecmp(arg, "off") == 0)) \ 199 CURCLASS_FLAGS_CLR(Field); \ 200 else \ 201 CURCLASS_FLAGS_SET(Field); \ 202 } while (0) 203 204 #define CONF_STRING(Field) \ 205 do { \ 206 if (none || EMPTYSTR(arg)) \ 207 arg = NULL; \ 208 else \ 209 arg = xstrdup(arg); \ 210 REASSIGN(curclass.Field, arg); \ 211 } while (0) 212 213 #define CONF_LL(Field,Arg,Min,Max) \ 214 do { \ 215 if (none || EMPTYSTR(Arg)) \ 216 goto nextline; \ 217 llval = strsuftollx(#Field, Arg, Min, Max, \ 218 errbuf, sizeof(errbuf)); \ 219 if (errbuf[0]) { \ 220 syslog(LOG_WARNING, "%s line %d: %s", \ 221 infile, (int)line, errbuf); \ 222 goto nextline; \ 223 } \ 224 curclass.Field = llval; \ 225 } while(0) 226 227 if (0) { 228 /* no-op */ 229 230 } else if ((strcasecmp(word, "advertise") == 0) 231 || (strcasecmp(word, "advertize") == 0)) { 232 struct addrinfo hints, *res; 233 int error; 234 235 memset((char *)&curclass.advertise, 0, 236 sizeof(curclass.advertise)); 237 curclass.advertise.su_len = 0; 238 if (none || EMPTYSTR(arg)) 239 continue; 240 res = NULL; 241 memset(&hints, 0, sizeof(hints)); 242 /* 243 * only get addresses of the family 244 * that we're listening on 245 */ 246 hints.ai_family = ctrl_addr.su_family; 247 hints.ai_socktype = SOCK_STREAM; 248 error = getaddrinfo(arg, "0", &hints, &res); 249 if (error) { 250 syslog(LOG_WARNING, "%s line %d: %s", 251 infile, (int)line, gai_strerror(error)); 252 advertiseparsefail: 253 if (res) 254 freeaddrinfo(res); 255 continue; 256 } 257 if (res->ai_next) { 258 syslog(LOG_WARNING, 259 "%s line %d: multiple addresses returned for `%s'; please be more specific", 260 infile, (int)line, arg); 261 goto advertiseparsefail; 262 } 263 if (sizeof(curclass.advertise) < res->ai_addrlen || ( 264 #ifdef INET6 265 res->ai_family != AF_INET6 && 266 #endif 267 res->ai_family != AF_INET)) { 268 syslog(LOG_WARNING, 269 "%s line %d: unsupported protocol %d for `%s'", 270 infile, (int)line, res->ai_family, arg); 271 goto advertiseparsefail; 272 } 273 memcpy(&curclass.advertise, res->ai_addr, 274 res->ai_addrlen); 275 curclass.advertise.su_len = res->ai_addrlen; 276 freeaddrinfo(res); 277 278 } else if (strcasecmp(word, "checkportcmd") == 0) { 279 CONF_FLAG(checkportcmd); 280 281 } else if (strcasecmp(word, "chroot") == 0) { 282 CONF_STRING(chroot); 283 284 } else if (strcasecmp(word, "classtype") == 0) { 285 if (!none && !EMPTYSTR(arg)) { 286 if (strcasecmp(arg, "GUEST") == 0) 287 curclass.type = CLASS_GUEST; 288 else if (strcasecmp(arg, "CHROOT") == 0) 289 curclass.type = CLASS_CHROOT; 290 else if (strcasecmp(arg, "REAL") == 0) 291 curclass.type = CLASS_REAL; 292 else { 293 syslog(LOG_WARNING, 294 "%s line %d: unknown class type `%s'", 295 infile, (int)line, arg); 296 continue; 297 } 298 } 299 300 } else if (strcasecmp(word, "conversion") == 0) { 301 char *suffix, *types, *disable, *convcmd; 302 303 if (EMPTYSTR(arg)) { 304 syslog(LOG_WARNING, 305 "%s line %d: %s requires a suffix", 306 infile, (int)line, word); 307 continue; /* need a suffix */ 308 } 309 NEXTWORD(p, types); 310 NEXTWORD(p, disable); 311 convcmd = p; 312 if (convcmd) 313 convcmd += strspn(convcmd, " \t"); 314 suffix = xstrdup(arg); 315 if (none || EMPTYSTR(types) || 316 EMPTYSTR(disable) || EMPTYSTR(convcmd)) { 317 types = NULL; 318 disable = NULL; 319 convcmd = NULL; 320 } else { 321 types = xstrdup(types); 322 disable = xstrdup(disable); 323 convcmd = xstrdup(convcmd); 324 } 325 for (conv = curclass.conversions; conv != NULL; 326 conv = conv->next) { 327 if (strcmp(conv->suffix, suffix) == 0) 328 break; 329 } 330 if (conv == NULL) { 331 conv = (struct ftpconv *) 332 calloc(1, sizeof(struct ftpconv)); 333 if (conv == NULL) { 334 syslog(LOG_WARNING, "can't malloc"); 335 continue; 336 } 337 conv->next = NULL; 338 for (cnext = curclass.conversions; 339 cnext != NULL; cnext = cnext->next) 340 if (cnext->next == NULL) 341 break; 342 if (cnext != NULL) 343 cnext->next = conv; 344 else 345 curclass.conversions = conv; 346 } 347 REASSIGN(conv->suffix, suffix); 348 REASSIGN(conv->types, types); 349 REASSIGN(conv->disable, disable); 350 REASSIGN(conv->command, convcmd); 351 352 } else if (strcasecmp(word, "denyquick") == 0) { 353 CONF_FLAG(denyquick); 354 355 } else if (strcasecmp(word, "display") == 0) { 356 CONF_STRING(display); 357 358 } else if (strcasecmp(word, "homedir") == 0) { 359 CONF_STRING(homedir); 360 361 } else if (strcasecmp(word, "limit") == 0) { 362 curclass.limit = DEFAULT_LIMIT; 363 REASSIGN(curclass.limitfile, NULL); 364 CONF_LL(limit, arg, -1, LLTMAX); 365 REASSIGN(curclass.limitfile, 366 EMPTYSTR(p) ? NULL : xstrdup(p)); 367 368 } else if (strcasecmp(word, "maxfilesize") == 0) { 369 curclass.maxfilesize = DEFAULT_MAXFILESIZE; 370 CONF_LL(maxfilesize, arg, -1, LLTMAX); 371 372 } else if (strcasecmp(word, "maxtimeout") == 0) { 373 curclass.maxtimeout = DEFAULT_MAXTIMEOUT; 374 CONF_LL(maxtimeout, arg, 375 MIN(30, curclass.timeout), LLTMAX); 376 377 } else if (strcasecmp(word, "mmapsize") == 0) { 378 curclass.mmapsize = 0; 379 CONF_LL(mmapsize, arg, 0, LLTMAX); 380 381 } else if (strcasecmp(word, "readsize") == 0) { 382 curclass.readsize = 0; 383 CONF_LL(readsize, arg, 0, LLTMAX); 384 385 } else if (strcasecmp(word, "writesize") == 0) { 386 curclass.writesize = 0; 387 CONF_LL(writesize, arg, 0, LLTMAX); 388 389 } else if (strcasecmp(word, "sendbufsize") == 0) { 390 curclass.sendbufsize = 0; 391 CONF_LL(sendbufsize, arg, 0, LLTMAX); 392 393 } else if (strcasecmp(word, "sendlowat") == 0) { 394 curclass.sendlowat = 0; 395 CONF_LL(sendlowat, arg, 0, LLTMAX); 396 397 } else if (strcasecmp(word, "modify") == 0) { 398 CONF_FLAG(modify); 399 400 } else if (strcasecmp(word, "motd") == 0) { 401 CONF_STRING(motd); 402 403 } else if (strcasecmp(word, "notify") == 0) { 404 CONF_STRING(notify); 405 406 } else if (strcasecmp(word, "passive") == 0) { 407 CONF_FLAG(passive); 408 409 } else if (strcasecmp(word, "portrange") == 0) { 410 long minport, maxport; 411 412 curclass.portmin = 0; 413 curclass.portmax = 0; 414 if (none || EMPTYSTR(arg)) 415 continue; 416 if (EMPTYSTR(p)) { 417 syslog(LOG_WARNING, 418 "%s line %d: missing maxport argument", 419 infile, (int)line); 420 continue; 421 } 422 minport = strsuftollx("minport", arg, IPPORT_RESERVED, 423 IPPORT_ANONMAX, errbuf, sizeof(errbuf)); 424 if (errbuf[0]) { 425 syslog(LOG_WARNING, "%s line %d: %s", 426 infile, (int)line, errbuf); 427 continue; 428 } 429 maxport = strsuftollx("maxport", p, IPPORT_RESERVED, 430 IPPORT_ANONMAX, errbuf, sizeof(errbuf)); 431 if (errbuf[0]) { 432 syslog(LOG_WARNING, "%s line %d: %s", 433 infile, (int)line, errbuf); 434 continue; 435 } 436 if (minport >= maxport) { 437 syslog(LOG_WARNING, 438 "%s line %d: minport %ld >= maxport %ld", 439 infile, (int)line, minport, maxport); 440 continue; 441 } 442 curclass.portmin = (int)minport; 443 curclass.portmax = (int)maxport; 444 445 } else if (strcasecmp(word, "private") == 0) { 446 CONF_FLAG(private); 447 448 } else if (strcasecmp(word, "rateget") == 0) { 449 curclass.maxrateget = curclass.rateget = 0; 450 CONF_LL(rateget, arg, 0, LLTMAX); 451 curclass.maxrateget = curclass.rateget; 452 453 } else if (strcasecmp(word, "rateput") == 0) { 454 curclass.maxrateput = curclass.rateput = 0; 455 CONF_LL(rateput, arg, 0, LLTMAX); 456 curclass.maxrateput = curclass.rateput; 457 458 } else if (strcasecmp(word, "sanenames") == 0) { 459 CONF_FLAG(sanenames); 460 461 } else if (strcasecmp(word, "timeout") == 0) { 462 curclass.timeout = DEFAULT_TIMEOUT; 463 CONF_LL(timeout, arg, 30, curclass.maxtimeout); 464 465 } else if (strcasecmp(word, "template") == 0) { 466 if (none) 467 continue; 468 REASSIGN(template, EMPTYSTR(arg) ? NULL : xstrdup(arg)); 469 470 } else if (strcasecmp(word, "umask") == 0) { 471 u_long fumask; 472 473 curclass.umask = DEFAULT_UMASK; 474 if (none || EMPTYSTR(arg)) 475 continue; 476 errno = 0; 477 endp = NULL; 478 fumask = strtoul(arg, &endp, 8); 479 if (errno || *arg == '\0' || *endp != '\0' || 480 fumask > 0777) { 481 syslog(LOG_WARNING, 482 "%s line %d: invalid umask %s", 483 infile, (int)line, arg); 484 continue; 485 } 486 curclass.umask = (mode_t)fumask; 487 488 } else if (strcasecmp(word, "upload") == 0) { 489 CONF_FLAG(upload); 490 if (! CURCLASS_FLAGS_ISSET(upload)) 491 CURCLASS_FLAGS_CLR(modify); 492 493 } else { 494 syslog(LOG_WARNING, 495 "%s line %d: unknown directive '%s'", 496 infile, (int)line, word); 497 continue; 498 } 499 nextline: 500 ; 501 } 502 REASSIGN(template, NULL); 503 fclose(f); 504 } 505 506 /* 507 * Show file listed in curclass.display first time in, and list all the 508 * files named in curclass.notify in the current directory. 509 * Send back responses with the prefix `code' + "-". 510 * If code == -1, flush the internal cache of directory names and return. 511 */ 512 void 513 show_chdir_messages(int code) 514 { 515 static StringList *slist = NULL; 516 517 struct stat st; 518 struct tm *t; 519 glob_t gl; 520 time_t now, then; 521 int age; 522 char curwd[MAXPATHLEN]; 523 char *cp, **rlist; 524 525 if (code == -1) { 526 if (slist != NULL) 527 sl_free(slist, 1); 528 slist = NULL; 529 return; 530 } 531 532 if (quietmessages) 533 return; 534 535 /* Setup list for directory cache */ 536 if (slist == NULL) 537 slist = sl_init(); 538 if (slist == NULL) { 539 syslog(LOG_WARNING, "can't allocate memory for stringlist"); 540 return; 541 } 542 543 /* Check if this directory has already been visited */ 544 if (getcwd(curwd, sizeof(curwd) - 1) == NULL) { 545 syslog(LOG_WARNING, "can't getcwd: %s", strerror(errno)); 546 return; 547 } 548 if (sl_find(slist, curwd) != NULL) 549 return; 550 551 cp = xstrdup(curwd); 552 if (sl_add(slist, cp) == -1) 553 syslog(LOG_WARNING, "can't add `%s' to stringlist", cp); 554 555 /* First check for a display file */ 556 (void)display_file(curclass.display, code); 557 558 /* Now see if there are any notify files */ 559 if (EMPTYSTR(curclass.notify)) 560 return; 561 562 memset(&gl, 0, sizeof(gl)); 563 if (glob(curclass.notify, GLOB_BRACE|GLOB_LIMIT, NULL, &gl) != 0 564 || gl.gl_matchc == 0) { 565 globfree(&gl); 566 return; 567 } 568 time(&now); 569 for (rlist = gl.gl_pathv; *rlist != NULL; rlist++) { 570 if (stat(*rlist, &st) != 0) 571 continue; 572 if (!S_ISREG(st.st_mode)) 573 continue; 574 then = st.st_mtime; 575 if (code != 0) { 576 reply(-code, "%s", ""); 577 code = 0; 578 } 579 reply(-code, "Please read the file %s", *rlist); 580 t = localtime(&now); 581 age = 365 * t->tm_year + t->tm_yday; 582 t = localtime(&then); 583 age -= 365 * t->tm_year + t->tm_yday; 584 reply(-code, " it was last modified on %.24s - %d day%s ago", 585 ctime(&then), age, PLURAL(age)); 586 } 587 globfree(&gl); 588 } 589 590 int 591 display_file(const char *file, int code) 592 { 593 FILE *f; 594 char *buf, *p; 595 char curwd[MAXPATHLEN]; 596 size_t len; 597 off_t lastnum; 598 time_t now; 599 600 lastnum = 0; 601 if (quietmessages) 602 return (0); 603 604 if (EMPTYSTR(file)) 605 return(0); 606 if ((f = fopen(file, "r")) == NULL) 607 return (0); 608 reply(-code, "%s", ""); 609 610 for (; 611 (buf = fparseln(f, &len, NULL, "\0\0\0", 0)) != NULL; free(buf)) { 612 if (len > 0) 613 if (buf[len - 1] == '\n') 614 buf[--len] = '\0'; 615 cprintf(stdout, " "); 616 617 for (p = buf; *p; p++) { 618 if (*p == '%') { 619 p++; 620 switch (*p) { 621 622 case 'c': 623 cprintf(stdout, "%s", 624 curclass.classname ? 625 curclass.classname : "<unknown>"); 626 break; 627 628 case 'C': 629 if (getcwd(curwd, sizeof(curwd)-1) 630 == NULL){ 631 syslog(LOG_WARNING, 632 "can't getcwd: %s", 633 strerror(errno)); 634 continue; 635 } 636 cprintf(stdout, "%s", curwd); 637 break; 638 639 case 'E': 640 if (! EMPTYSTR(emailaddr)) 641 cprintf(stdout, "%s", 642 emailaddr); 643 break; 644 645 case 'L': 646 cprintf(stdout, "%s", hostname); 647 break; 648 649 case 'M': 650 if (curclass.limit == -1) { 651 cprintf(stdout, "unlimited"); 652 lastnum = 0; 653 } else { 654 cprintf(stdout, LLF, 655 (LLT)curclass.limit); 656 lastnum = curclass.limit; 657 } 658 break; 659 660 case 'N': 661 cprintf(stdout, "%d", connections); 662 lastnum = connections; 663 break; 664 665 case 'R': 666 cprintf(stdout, "%s", remotehost); 667 break; 668 669 case 's': 670 if (lastnum != 1) 671 cprintf(stdout, "s"); 672 break; 673 674 case 'S': 675 if (lastnum != 1) 676 cprintf(stdout, "S"); 677 break; 678 679 case 'T': 680 now = time(NULL); 681 cprintf(stdout, "%.24s", ctime(&now)); 682 break; 683 684 case 'U': 685 cprintf(stdout, "%s", 686 pw ? pw->pw_name : "<unknown>"); 687 break; 688 689 case '%': 690 CPUTC('%', stdout); 691 break; 692 693 } 694 } else 695 CPUTC(*p, stdout); 696 } 697 cprintf(stdout, "\r\n"); 698 } 699 700 (void)fflush(stdout); 701 (void)fclose(f); 702 return (1); 703 } 704 705 /* 706 * Parse src, expanding '%' escapes, into dst (which must be at least 707 * MAXPATHLEN long). 708 */ 709 void 710 format_path(char *dst, const char *src) 711 { 712 size_t len; 713 const char *p; 714 715 dst[0] = '\0'; 716 len = 0; 717 if (src == NULL) 718 return; 719 for (p = src; *p && len < MAXPATHLEN; p++) { 720 if (*p == '%') { 721 p++; 722 switch (*p) { 723 724 case 'c': 725 len += strlcpy(dst + len, curclass.classname, 726 MAXPATHLEN - len); 727 break; 728 729 case 'd': 730 len += strlcpy(dst + len, pw->pw_dir, 731 MAXPATHLEN - len); 732 break; 733 734 case 'u': 735 len += strlcpy(dst + len, pw->pw_name, 736 MAXPATHLEN - len); 737 break; 738 739 case '%': 740 dst[len++] = '%'; 741 break; 742 743 } 744 } else 745 dst[len++] = *p; 746 } 747 if (len < MAXPATHLEN) 748 dst[len] = '\0'; 749 dst[MAXPATHLEN - 1] = '\0'; 750 } 751 752 /* 753 * Find s2 at the end of s1. If found, return a string up to (but 754 * not including) s2, otherwise returns NULL. 755 */ 756 static char * 757 strend(const char *s1, char *s2) 758 { 759 static char buf[MAXPATHLEN]; 760 761 char *start; 762 size_t l1, l2; 763 764 l1 = strlen(s1); 765 l2 = strlen(s2); 766 767 if (l2 >= l1 || l1 >= sizeof(buf)) 768 return(NULL); 769 770 strlcpy(buf, s1, sizeof(buf)); 771 start = buf + (l1 - l2); 772 773 if (strcmp(start, s2) == 0) { 774 *start = '\0'; 775 return(buf); 776 } else 777 return(NULL); 778 } 779 780 static int 781 filetypematch(char *types, int mode) 782 { 783 for ( ; types[0] != '\0'; types++) 784 switch (*types) { 785 case 'd': 786 if (S_ISDIR(mode)) 787 return(1); 788 break; 789 case 'f': 790 if (S_ISREG(mode)) 791 return(1); 792 break; 793 } 794 return(0); 795 } 796 797 /* 798 * Look for a conversion. If we succeed, return a pointer to the 799 * command to execute for the conversion. 800 * 801 * The command is stored in a static array so there's no memory 802 * leak problems, and not too much to change in ftpd.c. This 803 * routine doesn't need to be re-entrant unless we start using a 804 * multi-threaded ftpd, and that's not likely for a while... 805 */ 806 char ** 807 do_conversion(const char *fname) 808 { 809 struct ftpconv *cp; 810 struct stat st; 811 int o_errno; 812 char *base = NULL; 813 char *cmd, *p, *lp, **argv; 814 StringList *sl; 815 816 o_errno = errno; 817 sl = NULL; 818 cmd = NULL; 819 for (cp = curclass.conversions; cp != NULL; cp = cp->next) { 820 if (cp->suffix == NULL) { 821 syslog(LOG_WARNING, 822 "cp->suffix==NULL in conv list; SHOULDN'T HAPPEN!"); 823 continue; 824 } 825 if ((base = strend(fname, cp->suffix)) == NULL) 826 continue; 827 if (cp->types == NULL || cp->disable == NULL || 828 cp->command == NULL) 829 continue; 830 /* Is it enabled? */ 831 if (strcmp(cp->disable, ".") != 0 && 832 stat(cp->disable, &st) == 0) 833 continue; 834 /* Does the base exist? */ 835 if (stat(base, &st) < 0) 836 continue; 837 /* Is the file type ok */ 838 if (!filetypematch(cp->types, st.st_mode)) 839 continue; 840 break; /* "We have a winner!" */ 841 } 842 843 /* If we got through the list, no conversion */ 844 if (cp == NULL) 845 goto cleanup_do_conv; 846 847 /* Split up command into an argv */ 848 if ((sl = sl_init()) == NULL) 849 goto cleanup_do_conv; 850 cmd = xstrdup(cp->command); 851 p = cmd; 852 while (p) { 853 NEXTWORD(p, lp); 854 if (strcmp(lp, "%s") == 0) 855 lp = base; 856 if (sl_add(sl, xstrdup(lp)) == -1) 857 goto cleanup_do_conv; 858 } 859 860 if (sl_add(sl, NULL) == -1) 861 goto cleanup_do_conv; 862 argv = sl->sl_str; 863 free(cmd); 864 free(sl); 865 return(argv); 866 867 cleanup_do_conv: 868 if (sl) 869 sl_free(sl, 1); 870 free(cmd); 871 errno = o_errno; 872 return(NULL); 873 } 874 875 /* 876 * Count the number of current connections, reading from 877 * /var/run/ftpd.pids-<class> 878 * Does a kill -0 on each pid in that file, and only counts 879 * processes that exist (or frees the slot if it doesn't). 880 * Adds getpid() to the first free slot. Truncates the file 881 * if possible. 882 */ 883 void 884 count_users(void) 885 { 886 char fn[MAXPATHLEN]; 887 int fd, i, last; 888 size_t count; 889 pid_t *pids, mypid; 890 struct stat sb; 891 892 (void)strlcpy(fn, _PATH_CLASSPIDS, sizeof(fn)); 893 (void)strlcat(fn, curclass.classname, sizeof(fn)); 894 pids = NULL; 895 connections = 1; 896 897 if ((fd = open(fn, O_RDWR | O_CREAT, 0600)) == -1) 898 return; 899 if (lockf(fd, F_TLOCK, 0) == -1) 900 goto cleanup_count; 901 if (fstat(fd, &sb) == -1) 902 goto cleanup_count; 903 if ((pids = malloc(sb.st_size + sizeof(pid_t))) == NULL) 904 goto cleanup_count; 905 count = read(fd, pids, sb.st_size); 906 if (count < 0 || count != sb.st_size) 907 goto cleanup_count; 908 count /= sizeof(pid_t); 909 mypid = getpid(); 910 last = 0; 911 for (i = 0; i < count; i++) { 912 if (pids[i] == 0) 913 continue; 914 if (kill(pids[i], 0) == -1 && errno != EPERM) { 915 if (mypid != 0) { 916 pids[i] = mypid; 917 mypid = 0; 918 last = i; 919 } 920 } else { 921 connections++; 922 last = i; 923 } 924 } 925 if (mypid != 0) { 926 if (pids[last] != 0) 927 last++; 928 pids[last] = mypid; 929 } 930 count = (last + 1) * sizeof(pid_t); 931 if (lseek(fd, 0, SEEK_SET) == -1) 932 goto cleanup_count; 933 if (write(fd, pids, count) == -1) 934 goto cleanup_count; 935 (void)ftruncate(fd, count); 936 937 cleanup_count: 938 if (lseek(fd, 0, SEEK_SET) != -1) 939 (void)lockf(fd, F_ULOCK, 0); 940 close(fd); 941 REASSIGN(pids, NULL); 942 } 943