conf.c revision 1.37
1 /* $NetBSD: conf.c,v 1.37 2000/12/18 02:32:50 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1997-2000 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 1.37 2000/12/18 02:32:50 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; 122 123 CURCLASS_FLAGS_SET(checkportcmd); 124 CURCLASS_FLAGS_SET(modify); 125 CURCLASS_FLAGS_SET(passive); 126 CURCLASS_FLAGS_CLR(sanenames); 127 CURCLASS_FLAGS_SET(upload); 128 } 129 130 /* 131 * Parse the configuration file, looking for the named class, and 132 * define curclass to contain the appropriate settings. 133 */ 134 void 135 parse_conf(const char *findclass) 136 { 137 FILE *f; 138 char *buf, *p; 139 size_t len; 140 LLT llval; 141 int none, match; 142 char *endp; 143 char *class, *word, *arg, *template; 144 const char *infile; 145 size_t line; 146 unsigned int timeout; 147 struct ftpconv *conv, *cnext; 148 149 init_curclass(); 150 REASSIGN(curclass.classname, xstrdup(findclass)); 151 /* set more guest defaults */ 152 if (strcasecmp(findclass, "guest") == 0) { 153 CURCLASS_FLAGS_CLR(modify); 154 curclass.umask = 0707; 155 } 156 157 infile = conffilename(_PATH_FTPDCONF); 158 if ((f = fopen(infile, "r")) == NULL) 159 return; 160 161 line = 0; 162 template = NULL; 163 for (; 164 (buf = fparseln(f, &len, &line, NULL, FPARSELN_UNESCCOMM | 165 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 166 free(buf)) { 167 none = match = 0; 168 p = buf; 169 if (len < 1) 170 continue; 171 if (p[len - 1] == '\n') 172 p[--len] = '\0'; 173 if (EMPTYSTR(p)) 174 continue; 175 176 NEXTWORD(p, word); 177 NEXTWORD(p, class); 178 NEXTWORD(p, arg); 179 if (EMPTYSTR(word) || EMPTYSTR(class)) 180 continue; 181 if (strcasecmp(class, "none") == 0) 182 none = 1; 183 if (! (strcasecmp(class, findclass) == 0 || 184 (template != NULL && strcasecmp(class, template) == 0) || 185 none || 186 strcasecmp(class, "all") == 0) ) 187 continue; 188 189 #define CONF_FLAG(x) \ 190 do { \ 191 if (none || \ 192 (!EMPTYSTR(arg) && strcasecmp(arg, "off") == 0)) \ 193 CURCLASS_FLAGS_CLR(x); \ 194 else \ 195 CURCLASS_FLAGS_SET(x); \ 196 } while (0) 197 198 #define CONF_STRING(x) \ 199 do { \ 200 if (none || EMPTYSTR(arg)) \ 201 arg = NULL; \ 202 else \ 203 arg = xstrdup(arg); \ 204 REASSIGN(curclass.x, arg); \ 205 } while (0) 206 207 208 if (0) { 209 /* no-op */ 210 211 } else if (strcasecmp(word, "advertise") == 0) { 212 struct addrinfo hints, *res; 213 int error; 214 215 memset((char *)&curclass.advertise, 0, 216 sizeof(curclass.advertise)); 217 curclass.advertise.su_len = 0; 218 if (none || EMPTYSTR(arg)) 219 continue; 220 res = NULL; 221 memset(&hints, 0, sizeof(hints)); 222 /* 223 * only get addresses of the family 224 * that we're listening on 225 */ 226 hints.ai_family = ctrl_addr.su_family; 227 hints.ai_socktype = SOCK_STREAM; 228 error = getaddrinfo(arg, "0", &hints, &res); 229 if (error) { 230 syslog(LOG_WARNING, "%s line %d: %s", 231 infile, (int)line, gai_strerror(error)); 232 advertiseparsefail: 233 if (res) 234 freeaddrinfo(res); 235 continue; 236 } 237 if (res->ai_next) { 238 syslog(LOG_WARNING, 239 "%s line %d: multiple addresses returned for `%s'; please be more specific", 240 infile, (int)line, arg); 241 goto advertiseparsefail; 242 } 243 if (sizeof(curclass.advertise) < res->ai_addrlen || ( 244 #ifdef INET6 245 res->ai_family != AF_INET6 && 246 #endif 247 res->ai_family != AF_INET)) { 248 syslog(LOG_WARNING, 249 "%s line %d: unsupported protocol %d for `%s'", 250 infile, (int)line, res->ai_family, arg); 251 goto advertiseparsefail; 252 } 253 memcpy(&curclass.advertise, res->ai_addr, 254 res->ai_addrlen); 255 curclass.advertise.su_len = res->ai_addrlen; 256 freeaddrinfo(res); 257 258 } else if (strcasecmp(word, "checkportcmd") == 0) { 259 CONF_FLAG(checkportcmd); 260 261 } else if (strcasecmp(word, "chroot") == 0) { 262 CONF_STRING(chroot); 263 264 } else if (strcasecmp(word, "classtype") == 0) { 265 if (!none && !EMPTYSTR(arg)) { 266 if (strcasecmp(arg, "GUEST") == 0) 267 curclass.type = CLASS_GUEST; 268 else if (strcasecmp(arg, "CHROOT") == 0) 269 curclass.type = CLASS_CHROOT; 270 else if (strcasecmp(arg, "REAL") == 0) 271 curclass.type = CLASS_REAL; 272 else { 273 syslog(LOG_WARNING, 274 "%s line %d: unknown class type `%s'", 275 infile, (int)line, arg); 276 continue; 277 } 278 } 279 280 } else if (strcasecmp(word, "conversion") == 0) { 281 char *suffix, *types, *disable, *convcmd; 282 283 if (EMPTYSTR(arg)) { 284 syslog(LOG_WARNING, 285 "%s line %d: %s requires a suffix", 286 infile, (int)line, word); 287 continue; /* need a suffix */ 288 } 289 NEXTWORD(p, types); 290 NEXTWORD(p, disable); 291 convcmd = p; 292 if (convcmd) 293 convcmd += strspn(convcmd, " \t"); 294 suffix = xstrdup(arg); 295 if (none || EMPTYSTR(types) || 296 EMPTYSTR(disable) || EMPTYSTR(convcmd)) { 297 types = NULL; 298 disable = NULL; 299 convcmd = NULL; 300 } else { 301 types = xstrdup(types); 302 disable = xstrdup(disable); 303 convcmd = xstrdup(convcmd); 304 } 305 for (conv = curclass.conversions; conv != NULL; 306 conv = conv->next) { 307 if (strcmp(conv->suffix, suffix) == 0) 308 break; 309 } 310 if (conv == NULL) { 311 conv = (struct ftpconv *) 312 calloc(1, sizeof(struct ftpconv)); 313 if (conv == NULL) { 314 syslog(LOG_WARNING, "can't malloc"); 315 continue; 316 } 317 conv->next = NULL; 318 for (cnext = curclass.conversions; 319 cnext != NULL; cnext = cnext->next) 320 if (cnext->next == NULL) 321 break; 322 if (cnext != NULL) 323 cnext->next = conv; 324 else 325 curclass.conversions = conv; 326 } 327 REASSIGN(conv->suffix, suffix); 328 REASSIGN(conv->types, types); 329 REASSIGN(conv->disable, disable); 330 REASSIGN(conv->command, convcmd); 331 332 } else if (strcasecmp(word, "display") == 0) { 333 CONF_STRING(display); 334 335 } else if (strcasecmp(word, "homedir") == 0) { 336 CONF_STRING(homedir); 337 338 } else if (strcasecmp(word, "limit") == 0) { 339 int limit; 340 341 curclass.limit = DEFAULT_LIMIT; 342 REASSIGN(curclass.limitfile, NULL); 343 if (none || EMPTYSTR(arg)) 344 continue; 345 limit = (int)strtol(arg, &endp, 10); 346 if (*endp != 0) { 347 syslog(LOG_WARNING, 348 "%s line %d: invalid limit %s", 349 infile, (int)line, arg); 350 continue; 351 } 352 curclass.limit = limit; 353 REASSIGN(curclass.limitfile, 354 EMPTYSTR(p) ? NULL : xstrdup(p)); 355 356 } else if (strcasecmp(word, "maxfilesize") == 0) { 357 curclass.maxfilesize = DEFAULT_MAXFILESIZE; 358 if (none || EMPTYSTR(arg)) 359 continue; 360 llval = strsuftoll(arg); 361 if (llval == -1) { 362 syslog(LOG_WARNING, 363 "%s line %d: invalid maxfilesize %s", 364 infile, (int)line, arg); 365 continue; 366 } 367 curclass.maxfilesize = llval; 368 369 } else if (strcasecmp(word, "maxtimeout") == 0) { 370 curclass.maxtimeout = DEFAULT_MAXTIMEOUT; 371 if (none || EMPTYSTR(arg)) 372 continue; 373 timeout = (unsigned int)strtoul(arg, &endp, 10); 374 if (*endp != 0) { 375 syslog(LOG_WARNING, 376 "%s line %d: invalid maxtimeout %s", 377 infile, (int)line, arg); 378 continue; 379 } 380 if (timeout < 30) { 381 syslog(LOG_WARNING, 382 "%s line %d: maxtimeout %d < 30 seconds", 383 infile, (int)line, timeout); 384 continue; 385 } 386 if (timeout < curclass.timeout) { 387 syslog(LOG_WARNING, 388 "%s line %d: maxtimeout %d < timeout (%d)", 389 infile, (int)line, timeout, 390 curclass.timeout); 391 continue; 392 } 393 curclass.maxtimeout = timeout; 394 395 } else if (strcasecmp(word, "modify") == 0) { 396 CONF_FLAG(modify); 397 398 } else if (strcasecmp(word, "motd") == 0) { 399 CONF_STRING(motd); 400 401 } else if (strcasecmp(word, "notify") == 0) { 402 CONF_STRING(notify); 403 404 } else if (strcasecmp(word, "passive") == 0) { 405 CONF_FLAG(passive); 406 407 } else if (strcasecmp(word, "portrange") == 0) { 408 int minport, maxport; 409 char *min, *max; 410 411 curclass.portmin = 0; 412 curclass.portmax = 0; 413 if (none || EMPTYSTR(arg)) 414 continue; 415 min = arg; 416 NEXTWORD(p, max); 417 if (EMPTYSTR(max)) { 418 syslog(LOG_WARNING, 419 "%s line %d: missing maxport argument", 420 infile, (int)line); 421 continue; 422 } 423 minport = (int)strtol(min, &endp, 10); 424 if (*endp != 0 || minport < IPPORT_RESERVED || 425 minport > IPPORT_ANONMAX) { 426 syslog(LOG_WARNING, 427 "%s line %d: invalid minport %s", 428 infile, (int)line, min); 429 continue; 430 } 431 maxport = (int)strtol(max, &endp, 10); 432 if (*endp != 0 || maxport < IPPORT_RESERVED || 433 maxport > IPPORT_ANONMAX) { 434 syslog(LOG_WARNING, 435 "%s line %d: invalid maxport %s", 436 infile, (int)line, max); 437 continue; 438 } 439 if (minport >= maxport) { 440 syslog(LOG_WARNING, 441 "%s line %d: minport %d >= maxport %d", 442 infile, (int)line, minport, maxport); 443 continue; 444 } 445 curclass.portmin = minport; 446 curclass.portmax = maxport; 447 448 } else if (strcasecmp(word, "rateget") == 0) { 449 curclass.maxrateget = 0; 450 curclass.rateget = 0; 451 if (none || EMPTYSTR(arg)) 452 continue; 453 llval = strsuftoll(arg); 454 if (llval == -1) { 455 syslog(LOG_WARNING, 456 "%s line %d: invalid rateget %s", 457 infile, (int)line, arg); 458 continue; 459 } 460 curclass.maxrateget = llval; 461 curclass.rateget = llval; 462 463 } else if (strcasecmp(word, "rateput") == 0) { 464 curclass.maxrateput = 0; 465 curclass.rateput = 0; 466 if (none || EMPTYSTR(arg)) 467 continue; 468 llval = strsuftoll(arg); 469 if (llval == -1) { 470 syslog(LOG_WARNING, 471 "%s line %d: invalid rateput %s", 472 infile, (int)line, arg); 473 continue; 474 } 475 curclass.maxrateput = llval; 476 curclass.rateput = llval; 477 478 } else if (strcasecmp(word, "sanenames") == 0) { 479 CONF_FLAG(sanenames); 480 481 } else if (strcasecmp(word, "timeout") == 0) { 482 curclass.timeout = DEFAULT_TIMEOUT; 483 if (none || EMPTYSTR(arg)) 484 continue; 485 timeout = (unsigned int)strtoul(arg, &endp, 10); 486 if (*endp != 0) { 487 syslog(LOG_WARNING, 488 "%s line %d: invalid timeout %s", 489 infile, (int)line, arg); 490 continue; 491 } 492 if (timeout < 30) { 493 syslog(LOG_WARNING, 494 "%s line %d: timeout %d < 30 seconds", 495 infile, (int)line, timeout); 496 continue; 497 } 498 if (timeout > curclass.maxtimeout) { 499 syslog(LOG_WARNING, 500 "%s line %d: timeout %d > maxtimeout (%d)", 501 infile, (int)line, timeout, 502 curclass.maxtimeout); 503 continue; 504 } 505 curclass.timeout = timeout; 506 507 } else if (strcasecmp(word, "template") == 0) { 508 if (none) 509 continue; 510 REASSIGN(template, EMPTYSTR(arg) ? NULL : xstrdup(arg)); 511 512 } else if (strcasecmp(word, "umask") == 0) { 513 mode_t umask; 514 515 curclass.umask = DEFAULT_UMASK; 516 if (none || EMPTYSTR(arg)) 517 continue; 518 umask = (mode_t)strtoul(arg, &endp, 8); 519 if (*endp != 0 || umask > 0777) { 520 syslog(LOG_WARNING, 521 "%s line %d: invalid umask %s", 522 infile, (int)line, arg); 523 continue; 524 } 525 curclass.umask = umask; 526 527 } else if (strcasecmp(word, "upload") == 0) { 528 CONF_FLAG(upload); 529 if (! CURCLASS_FLAGS_ISSET(upload)) 530 CURCLASS_FLAGS_CLR(modify); 531 532 } else { 533 syslog(LOG_WARNING, 534 "%s line %d: unknown directive '%s'", 535 infile, (int)line, word); 536 continue; 537 } 538 } 539 REASSIGN(template, NULL); 540 fclose(f); 541 } 542 543 /* 544 * Show file listed in curclass.display first time in, and list all the 545 * files named in curclass.notify in the current directory. 546 * Send back responses with the prefix `code' + "-". 547 * If code == -1, flush the internal cache of directory names and return. 548 */ 549 void 550 show_chdir_messages(int code) 551 { 552 static StringList *slist = NULL; 553 554 struct stat st; 555 struct tm *t; 556 glob_t gl; 557 time_t now, then; 558 int age; 559 char cwd[MAXPATHLEN]; 560 char *cp, **rlist; 561 562 if (code == -1) { 563 if (slist != NULL) 564 sl_free(slist, 1); 565 slist = NULL; 566 return; 567 } 568 569 if (quietmessages) 570 return; 571 572 /* Setup list for directory cache */ 573 if (slist == NULL) 574 slist = sl_init(); 575 if (slist == NULL) { 576 syslog(LOG_WARNING, "can't allocate memory for stringlist"); 577 return; 578 } 579 580 /* Check if this directory has already been visited */ 581 if (getcwd(cwd, sizeof(cwd) - 1) == NULL) { 582 syslog(LOG_WARNING, "can't getcwd: %s", strerror(errno)); 583 return; 584 } 585 if (sl_find(slist, cwd) != NULL) 586 return; 587 588 cp = xstrdup(cwd); 589 if (sl_add(slist, cp) == -1) 590 syslog(LOG_WARNING, "can't add `%s' to stringlist", cp); 591 592 /* First check for a display file */ 593 (void)display_file(curclass.display, code); 594 595 /* Now see if there are any notify files */ 596 if (EMPTYSTR(curclass.notify)) 597 return; 598 599 if (glob(curclass.notify, 0, NULL, &gl) != 0 || gl.gl_matchc == 0) 600 return; 601 time(&now); 602 for (rlist = gl.gl_pathv; *rlist != NULL; rlist++) { 603 if (stat(*rlist, &st) != 0) 604 continue; 605 if (!S_ISREG(st.st_mode)) 606 continue; 607 then = st.st_mtime; 608 if (code != 0) { 609 reply(-code, "%s", ""); 610 code = 0; 611 } 612 reply(-code, "Please read the file %s", *rlist); 613 t = localtime(&now); 614 age = 365 * t->tm_year + t->tm_yday; 615 t = localtime(&then); 616 age -= 365 * t->tm_year + t->tm_yday; 617 reply(-code, " it was last modified on %.24s - %d day%s ago", 618 ctime(&then), age, PLURAL(age)); 619 } 620 globfree(&gl); 621 } 622 623 int 624 display_file(const char *file, int code) 625 { 626 FILE *f; 627 char *buf, *p, *cwd; 628 size_t len; 629 off_t lastnum; 630 time_t now; 631 632 lastnum = 0; 633 if (quietmessages) 634 return (0); 635 636 if (EMPTYSTR(file)) 637 return(0); 638 if ((f = fopen(file, "r")) == NULL) 639 return (0); 640 reply(-code, "%s", ""); 641 642 for (; 643 (buf = fparseln(f, &len, NULL, "\0\0\0", 0)) != NULL; free(buf)) { 644 if (len > 0) 645 if (buf[len - 1] == '\n') 646 buf[--len] = '\0'; 647 cprintf(stdout, " "); 648 649 for (p = buf; *p; p++) { 650 if (*p == '%') { 651 p++; 652 switch (*p) { 653 654 case 'c': 655 cprintf(stdout, "%s", 656 curclass.classname ? 657 curclass.classname : "<unknown>"); 658 break; 659 660 case 'C': 661 if (getcwd(cwd, sizeof(cwd)-1) == NULL){ 662 syslog(LOG_WARNING, 663 "can't getcwd: %s", 664 strerror(errno)); 665 continue; 666 } 667 cprintf(stdout, "%s", cwd); 668 break; 669 670 case 'E': 671 if (! EMPTYSTR(emailaddr)) 672 cprintf(stdout, "%s", 673 emailaddr); 674 break; 675 676 case 'L': 677 cprintf(stdout, "%s", hostname); 678 break; 679 680 case 'M': 681 if (curclass.limit == -1) { 682 cprintf(stdout, "unlimited"); 683 lastnum = 0; 684 } else { 685 cprintf(stdout, "%d", 686 curclass.limit); 687 lastnum = curclass.limit; 688 } 689 break; 690 691 case 'N': 692 cprintf(stdout, "%d", connections); 693 lastnum = connections; 694 break; 695 696 case 'R': 697 cprintf(stdout, "%s", remotehost); 698 break; 699 700 case 's': 701 if (lastnum != 1) 702 cprintf(stdout, "s"); 703 break; 704 705 case 'S': 706 if (lastnum != 1) 707 cprintf(stdout, "S"); 708 break; 709 710 case 'T': 711 now = time(NULL); 712 cprintf(stdout, "%.24s", ctime(&now)); 713 break; 714 715 case 'U': 716 cprintf(stdout, "%s", 717 pw ? pw->pw_name : "<unknown>"); 718 break; 719 720 case '%': 721 CPUTC('%', stdout); 722 break; 723 724 } 725 } else 726 CPUTC(*p, stdout); 727 } 728 cprintf(stdout, "\r\n"); 729 } 730 731 (void)fflush(stdout); 732 (void)fclose(f); 733 return (1); 734 } 735 736 /* 737 * Parse src, expanding '%' escapes, into dst (which must be at least 738 * MAXPATHLEN long). 739 */ 740 void 741 format_path(char *dst, const char *src) 742 { 743 size_t len; 744 const char *p; 745 746 dst[0] = '\0'; 747 len = 0; 748 if (src == NULL) 749 return; 750 for (p = src; *p && len < MAXPATHLEN; p++) { 751 if (*p == '%') { 752 p++; 753 switch (*p) { 754 755 case 'c': 756 len += strlcpy(dst + len, curclass.classname, 757 MAXPATHLEN - len); 758 break; 759 760 case 'd': 761 len += strlcpy(dst + len, pw->pw_dir, 762 MAXPATHLEN - len); 763 break; 764 765 case 'u': 766 len += strlcpy(dst + len, pw->pw_name, 767 MAXPATHLEN - len); 768 break; 769 770 case '%': 771 dst[len++] = '%'; 772 break; 773 774 } 775 } else 776 dst[len++] = *p; 777 } 778 if (len < MAXPATHLEN) 779 dst[len] = '\0'; 780 dst[MAXPATHLEN - 1] = '\0'; 781 } 782 783 /* 784 * Find s2 at the end of s1. If found, return a string up to (but 785 * not including) s2, otherwise returns NULL. 786 */ 787 static char * 788 strend(const char *s1, char *s2) 789 { 790 static char buf[MAXPATHLEN]; 791 792 char *start; 793 size_t l1, l2; 794 795 l1 = strlen(s1); 796 l2 = strlen(s2); 797 798 if (l2 >= l1) 799 return(NULL); 800 801 strlcpy(buf, s1, sizeof(buf)); 802 start = buf + (l1 - l2); 803 804 if (strcmp(start, s2) == 0) { 805 *start = '\0'; 806 return(buf); 807 } else 808 return(NULL); 809 } 810 811 static int 812 filetypematch(char *types, int mode) 813 { 814 for ( ; types[0] != '\0'; types++) 815 switch (*types) { 816 case 'd': 817 if (S_ISDIR(mode)) 818 return(1); 819 break; 820 case 'f': 821 if (S_ISREG(mode)) 822 return(1); 823 break; 824 } 825 return(0); 826 } 827 828 /* 829 * Look for a conversion. If we succeed, return a pointer to the 830 * command to execute for the conversion. 831 * 832 * The command is stored in a static array so there's no memory 833 * leak problems, and not too much to change in ftpd.c. This 834 * routine doesn't need to be re-entrant unless we start using a 835 * multi-threaded ftpd, and that's not likely for a while... 836 */ 837 char ** 838 do_conversion(const char *fname) 839 { 840 struct ftpconv *cp; 841 struct stat st; 842 int o_errno; 843 char *base = NULL; 844 char *cmd, *p, *lp, **argv; 845 StringList *sl; 846 847 o_errno = errno; 848 sl = NULL; 849 cmd = NULL; 850 for (cp = curclass.conversions; cp != NULL; cp = cp->next) { 851 if (cp->suffix == NULL) { 852 syslog(LOG_WARNING, 853 "cp->suffix==NULL in conv list; SHOULDN'T HAPPEN!"); 854 continue; 855 } 856 if ((base = strend(fname, cp->suffix)) == NULL) 857 continue; 858 if (cp->types == NULL || cp->disable == NULL || 859 cp->command == NULL) 860 continue; 861 /* Is it enabled? */ 862 if (strcmp(cp->disable, ".") != 0 && 863 stat(cp->disable, &st) == 0) 864 continue; 865 /* Does the base exist? */ 866 if (stat(base, &st) < 0) 867 continue; 868 /* Is the file type ok */ 869 if (!filetypematch(cp->types, st.st_mode)) 870 continue; 871 break; /* "We have a winner!" */ 872 } 873 874 /* If we got through the list, no conversion */ 875 if (cp == NULL) 876 goto cleanup_do_conv; 877 878 /* Split up command into an argv */ 879 if ((sl = sl_init()) == NULL) 880 goto cleanup_do_conv; 881 cmd = xstrdup(cp->command); 882 p = cmd; 883 while (p) { 884 NEXTWORD(p, lp); 885 if (strcmp(lp, "%s") == 0) 886 lp = base; 887 if (sl_add(sl, xstrdup(lp)) == -1) 888 goto cleanup_do_conv; 889 } 890 891 if (sl_add(sl, NULL) == -1) 892 goto cleanup_do_conv; 893 argv = sl->sl_str; 894 free(cmd); 895 free(sl); 896 return(argv); 897 898 cleanup_do_conv: 899 if (sl) 900 sl_free(sl, 1); 901 free(cmd); 902 errno = o_errno; 903 return(NULL); 904 } 905 906 /* 907 * Convert the string `arg' to a long long, which may have an optional SI suffix 908 * (`b', `k', `m', `g', `t'). Returns the number for success, -1 otherwise. 909 */ 910 LLT 911 strsuftoll(const char *arg) 912 { 913 char *cp; 914 LLT val; 915 916 if (!isdigit((unsigned char)arg[0])) 917 return (-1); 918 919 val = STRTOLL(arg, &cp, 10); 920 if (cp != NULL) { 921 if (cp[0] != '\0' && cp[1] != '\0') 922 return (-1); 923 switch (tolower((unsigned char)cp[0])) { 924 case '\0': 925 case 'b': 926 break; 927 case 'k': 928 val <<= 10; 929 break; 930 case 'm': 931 val <<= 20; 932 break; 933 case 'g': 934 val <<= 30; 935 break; 936 case 't': 937 val <<= 40; 938 break; 939 default: 940 return (-1); 941 } 942 } 943 if (val < 0) 944 return (-1); 945 946 return (val); 947 } 948 949 /* 950 * Count the number of current connections, reading from 951 * /var/run/ftpd.pids-<class> 952 * Does a kill -0 on each pid in that file, and only counts 953 * processes that exist (or frees the slot if it doesn't). 954 * Adds getpid() to the first free slot. Truncates the file 955 * if possible. 956 */ 957 void 958 count_users(void) 959 { 960 char fn[MAXPATHLEN]; 961 int fd, i, last; 962 size_t count; 963 pid_t *pids, mypid; 964 struct stat sb; 965 966 (void)strlcpy(fn, _PATH_CLASSPIDS, sizeof(fn)); 967 (void)strlcat(fn, curclass.classname, sizeof(fn)); 968 pids = NULL; 969 connections = 1; 970 971 if ((fd = open(fn, O_RDWR | O_CREAT, 0600)) == -1) 972 return; 973 if (lockf(fd, F_TLOCK, 0) == -1) 974 goto cleanup_count; 975 if (fstat(fd, &sb) == -1) 976 goto cleanup_count; 977 if ((pids = malloc(sb.st_size + sizeof(pid_t))) == NULL) 978 goto cleanup_count; 979 count = read(fd, pids, sb.st_size); 980 if (count < 0 || count != sb.st_size) 981 goto cleanup_count; 982 count /= sizeof(pid_t); 983 mypid = getpid(); 984 last = 0; 985 for (i = 0; i < count; i++) { 986 if (pids[i] == 0) 987 continue; 988 if (kill(pids[i], 0) == -1 && errno != EPERM) { 989 if (mypid != 0) { 990 pids[i] = mypid; 991 mypid = 0; 992 last = i; 993 } 994 } else { 995 connections++; 996 last = i; 997 } 998 } 999 if (mypid != 0) { 1000 if (pids[last] != 0) 1001 last++; 1002 pids[last] = mypid; 1003 } 1004 count = (last + 1) * sizeof(pid_t); 1005 if (lseek(fd, 0, SEEK_SET) == -1) 1006 goto cleanup_count; 1007 if (write(fd, pids, count) == -1) 1008 goto cleanup_count; 1009 (void)ftruncate(fd, count); 1010 1011 cleanup_count: 1012 if (lseek(fd, 0, SEEK_SET) != -1) 1013 (void)lockf(fd, F_ULOCK, 0); 1014 close(fd); 1015 REASSIGN(pids, NULL); 1016 } 1017
Indexes created Tue Sep 23 02:09:52 GMT 2025