conf.c revision 1.41
1 /* $NetBSD: conf.c,v 1.41 2001/04/25 01:46:25 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 1.41 2001/04/25 01:46:25 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 gl.gl_offs = 0; 600 if (glob(curclass.notify, GLOB_LIMIT, NULL, &gl) != 0 601 || gl.gl_matchc == 0) { 602 globfree(&gl); 603 return; 604 } 605 time(&now); 606 for (rlist = gl.gl_pathv; *rlist != NULL; rlist++) { 607 if (stat(*rlist, &st) != 0) 608 continue; 609 if (!S_ISREG(st.st_mode)) 610 continue; 611 then = st.st_mtime; 612 if (code != 0) { 613 reply(-code, "%s", ""); 614 code = 0; 615 } 616 reply(-code, "Please read the file %s", *rlist); 617 t = localtime(&now); 618 age = 365 * t->tm_year + t->tm_yday; 619 t = localtime(&then); 620 age -= 365 * t->tm_year + t->tm_yday; 621 reply(-code, " it was last modified on %.24s - %d day%s ago", 622 ctime(&then), age, PLURAL(age)); 623 } 624 globfree(&gl); 625 } 626 627 int 628 display_file(const char *file, int code) 629 { 630 FILE *f; 631 char *buf, *p, *cwd; 632 size_t len; 633 off_t lastnum; 634 time_t now; 635 636 lastnum = 0; 637 if (quietmessages) 638 return (0); 639 640 if (EMPTYSTR(file)) 641 return(0); 642 if ((f = fopen(file, "r")) == NULL) 643 return (0); 644 reply(-code, "%s", ""); 645 646 for (; 647 (buf = fparseln(f, &len, NULL, "\0\0\0", 0)) != NULL; free(buf)) { 648 if (len > 0) 649 if (buf[len - 1] == '\n') 650 buf[--len] = '\0'; 651 cprintf(stdout, " "); 652 653 for (p = buf; *p; p++) { 654 if (*p == '%') { 655 p++; 656 switch (*p) { 657 658 case 'c': 659 cprintf(stdout, "%s", 660 curclass.classname ? 661 curclass.classname : "<unknown>"); 662 break; 663 664 case 'C': 665 if (getcwd(cwd, sizeof(cwd)-1) == NULL){ 666 syslog(LOG_WARNING, 667 "can't getcwd: %s", 668 strerror(errno)); 669 continue; 670 } 671 cprintf(stdout, "%s", cwd); 672 break; 673 674 case 'E': 675 if (! EMPTYSTR(emailaddr)) 676 cprintf(stdout, "%s", 677 emailaddr); 678 break; 679 680 case 'L': 681 cprintf(stdout, "%s", hostname); 682 break; 683 684 case 'M': 685 if (curclass.limit == -1) { 686 cprintf(stdout, "unlimited"); 687 lastnum = 0; 688 } else { 689 cprintf(stdout, "%d", 690 curclass.limit); 691 lastnum = curclass.limit; 692 } 693 break; 694 695 case 'N': 696 cprintf(stdout, "%d", connections); 697 lastnum = connections; 698 break; 699 700 case 'R': 701 cprintf(stdout, "%s", remotehost); 702 break; 703 704 case 's': 705 if (lastnum != 1) 706 cprintf(stdout, "s"); 707 break; 708 709 case 'S': 710 if (lastnum != 1) 711 cprintf(stdout, "S"); 712 break; 713 714 case 'T': 715 now = time(NULL); 716 cprintf(stdout, "%.24s", ctime(&now)); 717 break; 718 719 case 'U': 720 cprintf(stdout, "%s", 721 pw ? pw->pw_name : "<unknown>"); 722 break; 723 724 case '%': 725 CPUTC('%', stdout); 726 break; 727 728 } 729 } else 730 CPUTC(*p, stdout); 731 } 732 cprintf(stdout, "\r\n"); 733 } 734 735 (void)fflush(stdout); 736 (void)fclose(f); 737 return (1); 738 } 739 740 /* 741 * Parse src, expanding '%' escapes, into dst (which must be at least 742 * MAXPATHLEN long). 743 */ 744 void 745 format_path(char *dst, const char *src) 746 { 747 size_t len; 748 const char *p; 749 750 dst[0] = '\0'; 751 len = 0; 752 if (src == NULL) 753 return; 754 for (p = src; *p && len < MAXPATHLEN; p++) { 755 if (*p == '%') { 756 p++; 757 switch (*p) { 758 759 case 'c': 760 len += strlcpy(dst + len, curclass.classname, 761 MAXPATHLEN - len); 762 break; 763 764 case 'd': 765 len += strlcpy(dst + len, pw->pw_dir, 766 MAXPATHLEN - len); 767 break; 768 769 case 'u': 770 len += strlcpy(dst + len, pw->pw_name, 771 MAXPATHLEN - len); 772 break; 773 774 case '%': 775 dst[len++] = '%'; 776 break; 777 778 } 779 } else 780 dst[len++] = *p; 781 } 782 if (len < MAXPATHLEN) 783 dst[len] = '\0'; 784 dst[MAXPATHLEN - 1] = '\0'; 785 } 786 787 /* 788 * Find s2 at the end of s1. If found, return a string up to (but 789 * not including) s2, otherwise returns NULL. 790 */ 791 static char * 792 strend(const char *s1, char *s2) 793 { 794 static char buf[MAXPATHLEN]; 795 796 char *start; 797 size_t l1, l2; 798 799 l1 = strlen(s1); 800 l2 = strlen(s2); 801 802 if (l2 >= l1) 803 return(NULL); 804 805 strlcpy(buf, s1, sizeof(buf)); 806 start = buf + (l1 - l2); 807 808 if (strcmp(start, s2) == 0) { 809 *start = '\0'; 810 return(buf); 811 } else 812 return(NULL); 813 } 814 815 static int 816 filetypematch(char *types, int mode) 817 { 818 for ( ; types[0] != '\0'; types++) 819 switch (*types) { 820 case 'd': 821 if (S_ISDIR(mode)) 822 return(1); 823 break; 824 case 'f': 825 if (S_ISREG(mode)) 826 return(1); 827 break; 828 } 829 return(0); 830 } 831 832 /* 833 * Look for a conversion. If we succeed, return a pointer to the 834 * command to execute for the conversion. 835 * 836 * The command is stored in a static array so there's no memory 837 * leak problems, and not too much to change in ftpd.c. This 838 * routine doesn't need to be re-entrant unless we start using a 839 * multi-threaded ftpd, and that's not likely for a while... 840 */ 841 char ** 842 do_conversion(const char *fname) 843 { 844 struct ftpconv *cp; 845 struct stat st; 846 int o_errno; 847 char *base = NULL; 848 char *cmd, *p, *lp, **argv; 849 StringList *sl; 850 851 o_errno = errno; 852 sl = NULL; 853 cmd = NULL; 854 for (cp = curclass.conversions; cp != NULL; cp = cp->next) { 855 if (cp->suffix == NULL) { 856 syslog(LOG_WARNING, 857 "cp->suffix==NULL in conv list; SHOULDN'T HAPPEN!"); 858 continue; 859 } 860 if ((base = strend(fname, cp->suffix)) == NULL) 861 continue; 862 if (cp->types == NULL || cp->disable == NULL || 863 cp->command == NULL) 864 continue; 865 /* Is it enabled? */ 866 if (strcmp(cp->disable, ".") != 0 && 867 stat(cp->disable, &st) == 0) 868 continue; 869 /* Does the base exist? */ 870 if (stat(base, &st) < 0) 871 continue; 872 /* Is the file type ok */ 873 if (!filetypematch(cp->types, st.st_mode)) 874 continue; 875 break; /* "We have a winner!" */ 876 } 877 878 /* If we got through the list, no conversion */ 879 if (cp == NULL) 880 goto cleanup_do_conv; 881 882 /* Split up command into an argv */ 883 if ((sl = sl_init()) == NULL) 884 goto cleanup_do_conv; 885 cmd = xstrdup(cp->command); 886 p = cmd; 887 while (p) { 888 NEXTWORD(p, lp); 889 if (strcmp(lp, "%s") == 0) 890 lp = base; 891 if (sl_add(sl, xstrdup(lp)) == -1) 892 goto cleanup_do_conv; 893 } 894 895 if (sl_add(sl, NULL) == -1) 896 goto cleanup_do_conv; 897 argv = sl->sl_str; 898 free(cmd); 899 free(sl); 900 return(argv); 901 902 cleanup_do_conv: 903 if (sl) 904 sl_free(sl, 1); 905 free(cmd); 906 errno = o_errno; 907 return(NULL); 908 } 909 910 /* 911 * Convert the string `arg' to a long long, which may have an optional SI suffix 912 * (`b', `k', `m', `g', `t'). Returns the number for success, -1 otherwise. 913 */ 914 LLT 915 strsuftoll(const char *arg) 916 { 917 char *cp; 918 LLT val; 919 920 if (!isdigit((unsigned char)arg[0])) 921 return (-1); 922 923 val = STRTOLL(arg, &cp, 10); 924 if (cp != NULL) { 925 if (cp[0] != '\0' && cp[1] != '\0') 926 return (-1); 927 switch (tolower((unsigned char)cp[0])) { 928 case '\0': 929 case 'b': 930 break; 931 case 'k': 932 val <<= 10; 933 break; 934 case 'm': 935 val <<= 20; 936 break; 937 case 'g': 938 val <<= 30; 939 break; 940 #ifndef NO_LONG_LONG 941 case 't': 942 val <<= 40; 943 break; 944 #endif 945 default: 946 return (-1); 947 } 948 } 949 if (val < 0) 950 return (-1); 951 952 return (val); 953 } 954 955 /* 956 * Count the number of current connections, reading from 957 * /var/run/ftpd.pids-<class> 958 * Does a kill -0 on each pid in that file, and only counts 959 * processes that exist (or frees the slot if it doesn't). 960 * Adds getpid() to the first free slot. Truncates the file 961 * if possible. 962 */ 963 void 964 count_users(void) 965 { 966 char fn[MAXPATHLEN]; 967 int fd, i, last; 968 size_t count; 969 pid_t *pids, mypid; 970 struct stat sb; 971 972 (void)strlcpy(fn, _PATH_CLASSPIDS, sizeof(fn)); 973 (void)strlcat(fn, curclass.classname, sizeof(fn)); 974 pids = NULL; 975 connections = 1; 976 977 if ((fd = open(fn, O_RDWR | O_CREAT, 0600)) == -1) 978 return; 979 if (lockf(fd, F_TLOCK, 0) == -1) 980 goto cleanup_count; 981 if (fstat(fd, &sb) == -1) 982 goto cleanup_count; 983 if ((pids = malloc(sb.st_size + sizeof(pid_t))) == NULL) 984 goto cleanup_count; 985 count = read(fd, pids, sb.st_size); 986 if (count < 0 || count != sb.st_size) 987 goto cleanup_count; 988 count /= sizeof(pid_t); 989 mypid = getpid(); 990 last = 0; 991 for (i = 0; i < count; i++) { 992 if (pids[i] == 0) 993 continue; 994 if (kill(pids[i], 0) == -1 && errno != EPERM) { 995 if (mypid != 0) { 996 pids[i] = mypid; 997 mypid = 0; 998 last = i; 999 } 1000 } else { 1001 connections++; 1002 last = i; 1003 } 1004 } 1005 if (mypid != 0) { 1006 if (pids[last] != 0) 1007 last++; 1008 pids[last] = mypid; 1009 } 1010 count = (last + 1) * sizeof(pid_t); 1011 if (lseek(fd, 0, SEEK_SET) == -1) 1012 goto cleanup_count; 1013 if (write(fd, pids, count) == -1) 1014 goto cleanup_count; 1015 (void)ftruncate(fd, count); 1016 1017 cleanup_count: 1018 if (lseek(fd, 0, SEEK_SET) != -1) 1019 (void)lockf(fd, F_ULOCK, 0); 1020 close(fd); 1021 REASSIGN(pids, NULL); 1022 } 1023
Indexes created Tue Sep 23 22:09:46 GMT 2025