1/* $NetBSD: conf.c,v 1.52 2004-08-09 12:56:47 lukem Exp $ */
2
3/*-
4 * Copyright (c) 1997-2004 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 1.52 2004-08-09 12:56:47 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 <signal.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <stringlist.h>
59#include <syslog.h>
60#include <time.h>
61#include <unistd.h>
62#include <util.h>
63
64#ifdef KERBEROS5
65#include <krb5/krb5.h>
66#endif
67
68#include "extern.h"
69#include "pathnames.h"
70
71static char *strend(const char *, char *);
72static int filetypematch(char *, int);
73
74
75 /* class defaults */
76#define DEFAULT_LIMIT -1 /* unlimited connections */
77#define DEFAULT_MAXFILESIZE -1 /* unlimited file size */
78#define DEFAULT_MAXTIMEOUT 7200 /* 2 hours */
79#define DEFAULT_TIMEOUT 900 /* 15 minutes */
80#define DEFAULT_UMASK 027 /* 15 minutes */
81
82/*
83 * Initialise curclass to an `empty' state
84 */
85void
86init_curclass(void)
87{
88 struct ftpconv *conv, *cnext;
89
90 for (conv = curclass.conversions; conv != NULL; conv = cnext) {
91 REASSIGN(conv->suffix, NULL);
92 REASSIGN(conv->types, NULL);
93 REASSIGN(conv->disable, NULL);
94 REASSIGN(conv->command, NULL);
95 cnext = conv->next;
96 free(conv);
97 }
98
99 memset((char *)&curclass.advertise, 0, sizeof(curclass.advertise));
100 curclass.advertise.su_len = 0; /* `not used' */
101 REASSIGN(curclass.chroot, NULL);
102 REASSIGN(curclass.classname, NULL);
103 curclass.conversions = NULL;
104 REASSIGN(curclass.display, NULL);
105 REASSIGN(curclass.homedir, NULL);
106 curclass.limit = DEFAULT_LIMIT;
107 REASSIGN(curclass.limitfile, NULL);
108 curclass.maxfilesize = DEFAULT_MAXFILESIZE;
109 curclass.maxrateget = 0;
110 curclass.maxrateput = 0;
111 curclass.maxtimeout = DEFAULT_MAXTIMEOUT;
112 REASSIGN(curclass.motd, xstrdup(_PATH_FTPLOGINMESG));
113 REASSIGN(curclass.notify, NULL);
114 curclass.portmin = 0;
115 curclass.portmax = 0;
116 curclass.rateget = 0;
117 curclass.rateput = 0;
118 curclass.timeout = DEFAULT_TIMEOUT;
119 /* curclass.type is set elsewhere */
120 curclass.umask = DEFAULT_UMASK;
121 curclass.mmapsize = 0;
122 curclass.readsize = 0;
123 curclass.writesize = 0;
124 curclass.sendbufsize = 0;
125 curclass.sendlowat = 0;
126
127 CURCLASS_FLAGS_SET(checkportcmd);
128 CURCLASS_FLAGS_CLR(denyquick);
129 CURCLASS_FLAGS_SET(modify);
130 CURCLASS_FLAGS_SET(passive);
131 CURCLASS_FLAGS_CLR(private);
132 CURCLASS_FLAGS_CLR(sanenames);
133 CURCLASS_FLAGS_SET(upload);
134}
135
136/*
137 * Parse the configuration file, looking for the named class, and
138 * define curclass to contain the appropriate settings.
139 */
140void
141parse_conf(const char *findclass)
142{
143 FILE *f;
144 char *buf, *p;
145 size_t len;
146 LLT llval;
147 int none, match;
148 char *endp, errbuf[100];
149 char *class, *word, *arg, *template;
150 const char *infile;
151 size_t line;
152 struct ftpconv *conv, *cnext;
153
154 init_curclass();
155 REASSIGN(curclass.classname, xstrdup(findclass));
156 /* set more guest defaults */
157 if (strcasecmp(findclass, "guest") == 0) {
158 CURCLASS_FLAGS_CLR(modify);
159 curclass.umask = 0707;
160 }
161
162 infile = conffilename(_PATH_FTPDCONF);
163 if ((f = fopen(infile, "r")) == NULL)
164 return;
165
166 line = 0;
167 template = NULL;
168 for (;
169 (buf = fparseln(f, &len, &line, NULL, FPARSELN_UNESCCOMM |
170 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL;
171 free(buf)) {
172 none = match = 0;
173 p = buf;
174 if (len < 1)
175 continue;
176 if (p[len - 1] == '\n')
177 p[--len] = '\0';
178 if (EMPTYSTR(p))
179 continue;
180
181 NEXTWORD(p, word);
182 NEXTWORD(p, class);
183 NEXTWORD(p, arg);
184 if (EMPTYSTR(word) || EMPTYSTR(class))
185 continue;
186 if (strcasecmp(class, "none") == 0)
187 none = 1;
188 if (! (strcasecmp(class, findclass) == 0 ||
189 (template != NULL && strcasecmp(class, template) == 0) ||
190 none ||
191 strcasecmp(class, "all") == 0) )
192 continue;
193
194#define CONF_FLAG(Field) \
195 do { \
196 if (none || \
197 (!EMPTYSTR(arg) && strcasecmp(arg, "off") == 0)) \
198 CURCLASS_FLAGS_CLR(Field); \
199 else \
200 CURCLASS_FLAGS_SET(Field); \
201 } while (0)
202
203#define CONF_STRING(Field) \
204 do { \
205 if (none || EMPTYSTR(arg)) \
206 arg = NULL; \
207 else \
208 arg = xstrdup(arg); \
209 REASSIGN(curclass.Field, arg); \
210 } while (0)
211
212#define CONF_LL(Field,Arg,Min,Max) \
213 do { \
214 if (none || EMPTYSTR(Arg)) \
215 goto nextline; \
216 llval = strsuftollx(#Field, Arg, Min, Max, \
217 errbuf, sizeof(errbuf)); \
218 if (errbuf[0]) { \
219 syslog(LOG_WARNING, "%s line %d: %s", \
220 infile, (int)line, errbuf); \
221 goto nextline; \
222 } \
223 curclass.Field = llval; \
224 } while(0)
225
226 if (0) {
227 /* no-op */
228
229 } else if ((strcasecmp(word, "advertise") == 0)
230 || (strcasecmp(word, "advertize") == 0)) {
231 struct addrinfo hints, *res;
232 int error;
233
234 memset((char *)&curclass.advertise, 0,
235 sizeof(curclass.advertise));
236 curclass.advertise.su_len = 0;
237 if (none || EMPTYSTR(arg))
238 continue;
239 res = NULL;
240 memset(&hints, 0, sizeof(hints));
241 /*
242 * only get addresses of the family
243 * that we're listening on
244 */
245 hints.ai_family = ctrl_addr.su_family;
246 hints.ai_socktype = SOCK_STREAM;
247 error = getaddrinfo(arg, "0", &hints, &res);
248 if (error) {
249 syslog(LOG_WARNING, "%s line %d: %s",
250 infile, (int)line, gai_strerror(error));
251 advertiseparsefail:
252 if (res)
253 freeaddrinfo(res);
254 continue;
255 }
256 if (res->ai_next) {
257 syslog(LOG_WARNING,
258 "%s line %d: multiple addresses returned for `%s'; please be more specific",
259 infile, (int)line, arg);
260 goto advertiseparsefail;
261 }
262 if (sizeof(curclass.advertise) < res->ai_addrlen || (
263#ifdef INET6
264 res->ai_family != AF_INET6 &&
265#endif
266 res->ai_family != AF_INET)) {
267 syslog(LOG_WARNING,
268 "%s line %d: unsupported protocol %d for `%s'",
269 infile, (int)line, res->ai_family, arg);
270 goto advertiseparsefail;
271 }
272 memcpy(&curclass.advertise, res->ai_addr,
273 res->ai_addrlen);
274 curclass.advertise.su_len = res->ai_addrlen;
275 freeaddrinfo(res);
276
277 } else if (strcasecmp(word, "checkportcmd") == 0) {
278 CONF_FLAG(checkportcmd);
279
280 } else if (strcasecmp(word, "chroot") == 0) {
281 CONF_STRING(chroot);
282
283 } else if (strcasecmp(word, "classtype") == 0) {
284 if (!none && !EMPTYSTR(arg)) {
285 if (strcasecmp(arg, "GUEST") == 0)
286 curclass.type = CLASS_GUEST;
287 else if (strcasecmp(arg, "CHROOT") == 0)
288 curclass.type = CLASS_CHROOT;
289 else if (strcasecmp(arg, "REAL") == 0)
290 curclass.type = CLASS_REAL;
291 else {
292 syslog(LOG_WARNING,
293 "%s line %d: unknown class type `%s'",
294 infile, (int)line, arg);
295 continue;
296 }
297 }
298
299 } else if (strcasecmp(word, "conversion") == 0) {
300 char *suffix, *types, *disable, *convcmd;
301
302 if (EMPTYSTR(arg)) {
303 syslog(LOG_WARNING,
304 "%s line %d: %s requires a suffix",
305 infile, (int)line, word);
306 continue; /* need a suffix */
307 }
308 NEXTWORD(p, types);
309 NEXTWORD(p, disable);
310 convcmd = p;
311 if (convcmd)
312 convcmd += strspn(convcmd, " \t");
313 suffix = xstrdup(arg);
314 if (none || EMPTYSTR(types) ||
315 EMPTYSTR(disable) || EMPTYSTR(convcmd)) {
316 types = NULL;
317 disable = NULL;
318 convcmd = NULL;
319 } else {
320 types = xstrdup(types);
321 disable = xstrdup(disable);
322 convcmd = xstrdup(convcmd);
323 }
324 for (conv = curclass.conversions; conv != NULL;
325 conv = conv->next) {
326 if (strcmp(conv->suffix, suffix) == 0)
327 break;
328 }
329 if (conv == NULL) {
330 conv = (struct ftpconv *)
331 calloc(1, sizeof(struct ftpconv));
332 if (conv == NULL) {
333 syslog(LOG_WARNING, "can't malloc");
334 continue;
335 }
336 conv->next = NULL;
337 for (cnext = curclass.conversions;
338 cnext != NULL; cnext = cnext->next)
339 if (cnext->next == NULL)
340 break;
341 if (cnext != NULL)
342 cnext->next = conv;
343 else
344 curclass.conversions = conv;
345 }
346 REASSIGN(conv->suffix, suffix);
347 REASSIGN(conv->types, types);
348 REASSIGN(conv->disable, disable);
349 REASSIGN(conv->command, convcmd);
350
351 } else if (strcasecmp(word, "denyquick") == 0) {
352 CONF_FLAG(denyquick);
353
354 } else if (strcasecmp(word, "display") == 0) {
355 CONF_STRING(display);
356
357 } else if (strcasecmp(word, "homedir") == 0) {
358 CONF_STRING(homedir);
359
360 } else if (strcasecmp(word, "limit") == 0) {
361 curclass.limit = DEFAULT_LIMIT;
362 REASSIGN(curclass.limitfile, NULL);
363 CONF_LL(limit, arg, -1, LLTMAX);
364 REASSIGN(curclass.limitfile,
365 EMPTYSTR(p) ? NULL : xstrdup(p));
366
367 } else if (strcasecmp(word, "maxfilesize") == 0) {
368 curclass.maxfilesize = DEFAULT_MAXFILESIZE;
369 CONF_LL(maxfilesize, arg, -1, LLTMAX);
370
371 } else if (strcasecmp(word, "maxtimeout") == 0) {
372 curclass.maxtimeout = DEFAULT_MAXTIMEOUT;
373 CONF_LL(maxtimeout, arg,
374 MIN(30, curclass.timeout), LLTMAX);
375
376 } else if (strcasecmp(word, "mmapsize") == 0) {
377 curclass.mmapsize = 0;
378 CONF_LL(mmapsize, arg, 0, LLTMAX);
379
380 } else if (strcasecmp(word, "readsize") == 0) {
381 curclass.readsize = 0;
382 CONF_LL(readsize, arg, 0, LLTMAX);
383
384 } else if (strcasecmp(word, "writesize") == 0) {
385 curclass.writesize = 0;
386 CONF_LL(writesize, arg, 0, LLTMAX);
387
388 } else if (strcasecmp(word, "sendbufsize") == 0) {
389 curclass.sendbufsize = 0;
390 CONF_LL(sendbufsize, arg, 0, LLTMAX);
391
392 } else if (strcasecmp(word, "sendlowat") == 0) {
393 curclass.sendlowat = 0;
394 CONF_LL(sendlowat, arg, 0, LLTMAX);
395
396 } else if (strcasecmp(word, "modify") == 0) {
397 CONF_FLAG(modify);
398
399 } else if (strcasecmp(word, "motd") == 0) {
400 CONF_STRING(motd);
401
402 } else if (strcasecmp(word, "notify") == 0) {
403 CONF_STRING(notify);
404
405 } else if (strcasecmp(word, "passive") == 0) {
406 CONF_FLAG(passive);
407
408 } else if (strcasecmp(word, "portrange") == 0) {
409 long minport, maxport;
410
411 curclass.portmin = 0;
412 curclass.portmax = 0;
413 if (none || EMPTYSTR(arg))
414 continue;
415 if (EMPTYSTR(p)) {
416 syslog(LOG_WARNING,
417 "%s line %d: missing maxport argument",
418 infile, (int)line);
419 continue;
420 }
421 minport = strsuftollx("minport", arg, IPPORT_RESERVED,
422 IPPORT_ANONMAX, errbuf, sizeof(errbuf));
423 if (errbuf[0]) {
424 syslog(LOG_WARNING, "%s line %d: %s",
425 infile, (int)line, errbuf);
426 continue;
427 }
428 maxport = strsuftollx("maxport", p, IPPORT_RESERVED,
429 IPPORT_ANONMAX, errbuf, sizeof(errbuf));
430 if (errbuf[0]) {
431 syslog(LOG_WARNING, "%s line %d: %s",
432 infile, (int)line, errbuf);
433 continue;
434 }
435 if (minport >= maxport) {
436 syslog(LOG_WARNING,
437 "%s line %d: minport %ld >= maxport %ld",
438 infile, (int)line, minport, maxport);
439 continue;
440 }
441 curclass.portmin = (int)minport;
442 curclass.portmax = (int)maxport;
443
444 } else if (strcasecmp(word, "private") == 0) {
445 CONF_FLAG(private);
446
447 } else if (strcasecmp(word, "rateget") == 0) {
448 curclass.maxrateget = curclass.rateget = 0;
449 CONF_LL(rateget, arg, 0, LLTMAX);
450 curclass.maxrateget = curclass.rateget;
451
452 } else if (strcasecmp(word, "rateput") == 0) {
453 curclass.maxrateput = curclass.rateput = 0;
454 CONF_LL(rateput, arg, 0, LLTMAX);
455 curclass.maxrateput = curclass.rateput;
456
457 } else if (strcasecmp(word, "sanenames") == 0) {
458 CONF_FLAG(sanenames);
459
460 } else if (strcasecmp(word, "timeout") == 0) {
461 curclass.timeout = DEFAULT_TIMEOUT;
462 CONF_LL(timeout, arg, 30, curclass.maxtimeout);
463
464 } else if (strcasecmp(word, "template") == 0) {
465 if (none)
466 continue;
467 REASSIGN(template, EMPTYSTR(arg) ? NULL : xstrdup(arg));
468
469 } else if (strcasecmp(word, "umask") == 0) {
470 u_long fumask;
471
472 curclass.umask = DEFAULT_UMASK;
473 if (none || EMPTYSTR(arg))
474 continue;
475 errno = 0;
476 endp = NULL;
477 fumask = strtoul(arg, &endp, 8);
478 if (errno || *arg == '\0' || *endp != '\0' ||
479 fumask > 0777) {
480 syslog(LOG_WARNING,
481 "%s line %d: invalid umask %s",
482 infile, (int)line, arg);
483 continue;
484 }
485 curclass.umask = (mode_t)fumask;
486
487 } else if (strcasecmp(word, "upload") == 0) {
488 CONF_FLAG(upload);
489 if (! CURCLASS_FLAGS_ISSET(upload))
490 CURCLASS_FLAGS_CLR(modify);
491
492 } else {
493 syslog(LOG_WARNING,
494 "%s line %d: unknown directive '%s'",
495 infile, (int)line, word);
496 continue;
497 }
498 nextline:
499 ;
500 }
501 REASSIGN(template, NULL);
502 fclose(f);
503}
504
505/*
506 * Show file listed in curclass.display first time in, and list all the
507 * files named in curclass.notify in the current directory.
508 * Send back responses with the prefix `code' + "-".
509 * If code == -1, flush the internal cache of directory names and return.
510 */
511void
512show_chdir_messages(int code)
513{
514 static StringList *slist = NULL;
515
516 struct stat st;
517 struct tm *t;
518 glob_t gl;
519 time_t now, then;
520 int age;
521 char curwd[MAXPATHLEN];
522 char *cp, **rlist;
523
524 if (code == -1) {
525 if (slist != NULL)
526 sl_free(slist, 1);
527 slist = NULL;
528 return;
529 }
530
531 if (quietmessages)
532 return;
533
534 /* Setup list for directory cache */
535 if (slist == NULL)
536 slist = sl_init();
537 if (slist == NULL) {
538 syslog(LOG_WARNING, "can't allocate memory for stringlist");
539 return;
540 }
541
542 /* Check if this directory has already been visited */
543 if (getcwd(curwd, sizeof(curwd) - 1) == NULL) {
544 syslog(LOG_WARNING, "can't getcwd: %s", strerror(errno));
545 return;
546 }
547 if (sl_find(slist, curwd) != NULL)
548 return;
549
550 cp = xstrdup(curwd);
551 if (sl_add(slist, cp) == -1)
552 syslog(LOG_WARNING, "can't add `%s' to stringlist", cp);
553
554 /* First check for a display file */
555 (void)display_file(curclass.display, code);
556
557 /* Now see if there are any notify files */
558 if (EMPTYSTR(curclass.notify))
559 return;
560
561 memset(&gl, 0, sizeof(gl));
562 if (glob(curclass.notify, GLOB_BRACE|GLOB_LIMIT, NULL, &gl) != 0
563 || gl.gl_matchc == 0) {
564 globfree(&gl);
565 return;
566 }
567 time(&now);
568 for (rlist = gl.gl_pathv; *rlist != NULL; rlist++) {
569 if (stat(*rlist, &st) != 0)
570 continue;
571 if (!S_ISREG(st.st_mode))
572 continue;
573 then = st.st_mtime;
574 if (code != 0) {
575 reply(-code, "%s", "");
576 code = 0;
577 }
578 reply(-code, "Please read the file %s", *rlist);
579 t = localtime(&now);
580 age = 365 * t->tm_year + t->tm_yday;
581 t = localtime(&then);
582 age -= 365 * t->tm_year + t->tm_yday;
583 reply(-code, " it was last modified on %.24s - %d day%s ago",
584 ctime(&then), age, PLURAL(age));
585 }
586 globfree(&gl);
587}
588
589int
590display_file(const char *file, int code)
591{
592 FILE *f;
593 char *buf, *p;
594 char curwd[MAXPATHLEN];
595 size_t len;
596 off_t lastnum;
597 time_t now;
598
599 lastnum = 0;
600 if (quietmessages)
601 return (0);
602
603 if (EMPTYSTR(file))
604 return(0);
605 if ((f = fopen(file, "r")) == NULL)
606 return (0);
607 reply(-code, "%s", "");
608
609 for (;
610 (buf = fparseln(f, &len, NULL, "\0\0\0", 0)) != NULL; free(buf)) {
611 if (len > 0)
612 if (buf[len - 1] == '\n')
613 buf[--len] = '\0';
614 cprintf(stdout, " ");
615
616 for (p = buf; *p; p++) {
617 if (*p == '%') {
618 p++;
619 switch (*p) {
620
621 case 'c':
622 cprintf(stdout, "%s",
623 curclass.classname ?
624 curclass.classname : "<unknown>");
625 break;
626
627 case 'C':
628 if (getcwd(curwd, sizeof(curwd)-1)
629 == NULL){
630 syslog(LOG_WARNING,
631 "can't getcwd: %s",
632 strerror(errno));
633 continue;
634 }
635 cprintf(stdout, "%s", curwd);
636 break;
637
638 case 'E':
639 if (! EMPTYSTR(emailaddr))
640 cprintf(stdout, "%s",
641 emailaddr);
642 break;
643
644 case 'L':
645 cprintf(stdout, "%s", hostname);
646 break;
647
648 case 'M':
649 if (curclass.limit == -1) {
650 cprintf(stdout, "unlimited");
651 lastnum = 0;
652 } else {
653 cprintf(stdout, LLF,
654 (LLT)curclass.limit);
655 lastnum = curclass.limit;
656 }
657 break;
658
659 case 'N':
660 cprintf(stdout, "%d", connections);
661 lastnum = connections;
662 break;
663
664 case 'R':
665 cprintf(stdout, "%s", remotehost);
666 break;
667
668 case 's':
669 if (lastnum != 1)
670 cprintf(stdout, "s");
671 break;
672
673 case 'S':
674 if (lastnum != 1)
675 cprintf(stdout, "S");
676 break;
677
678 case 'T':
679 now = time(NULL);
680 cprintf(stdout, "%.24s", ctime(&now));
681 break;
682
683 case 'U':
684 cprintf(stdout, "%s",
685 pw ? pw->pw_name : "<unknown>");
686 break;
687
688 case '%':
689 CPUTC('%', stdout);
690 break;
691
692 }
693 } else
694 CPUTC(*p, stdout);
695 }
696 cprintf(stdout, "\r\n");
697 }
698
699 (void)fflush(stdout);
700 (void)fclose(f);
701 return (1);
702}
703
704/*
705 * Parse src, expanding '%' escapes, into dst (which must be at least
706 * MAXPATHLEN long).
707 */
708void
709format_path(char *dst, const char *src)
710{
711 size_t len;
712 const char *p;
713
714 dst[0] = '\0';
715 len = 0;
716 if (src == NULL)
717 return;
718 for (p = src; *p && len < MAXPATHLEN; p++) {
719 if (*p == '%') {
720 p++;
721 switch (*p) {
722
723 case 'c':
724 len += strlcpy(dst + len, curclass.classname,
725 MAXPATHLEN - len);
726 break;
727
728 case 'd':
729 len += strlcpy(dst + len, pw->pw_dir,
730 MAXPATHLEN - len);
731 break;
732
733 case 'u':
734 len += strlcpy(dst + len, pw->pw_name,
735 MAXPATHLEN - len);
736 break;
737
738 case '%':
739 dst[len++] = '%';
740 break;
741
742 }
743 } else
744 dst[len++] = *p;
745 }
746 if (len < MAXPATHLEN)
747 dst[len] = '\0';
748 dst[MAXPATHLEN - 1] = '\0';
749}
750
751/*
752 * Find s2 at the end of s1. If found, return a string up to (but
753 * not including) s2, otherwise returns NULL.
754 */
755static char *
756strend(const char *s1, char *s2)
757{
758 static char buf[MAXPATHLEN];
759
760 char *start;
761 size_t l1, l2;
762
763 l1 = strlen(s1);
764 l2 = strlen(s2);
765
766 if (l2 >= l1 || l1 >= sizeof(buf))
767 return(NULL);
768
769 strlcpy(buf, s1, sizeof(buf));
770 start = buf + (l1 - l2);
771
772 if (strcmp(start, s2) == 0) {
773 *start = '\0';
774 return(buf);
775 } else
776 return(NULL);
777}
778
779static int
780filetypematch(char *types, int mode)
781{
782 for ( ; types[0] != '\0'; types++)
783 switch (*types) {
784 case 'd':
785 if (S_ISDIR(mode))
786 return(1);
787 break;
788 case 'f':
789 if (S_ISREG(mode))
790 return(1);
791 break;
792 }
793 return(0);
794}
795
796/*
797 * Look for a conversion. If we succeed, return a pointer to the
798 * command to execute for the conversion.
799 *
800 * The command is stored in a static array so there's no memory
801 * leak problems, and not too much to change in ftpd.c. This
802 * routine doesn't need to be re-entrant unless we start using a
803 * multi-threaded ftpd, and that's not likely for a while...
804 */
805char **
806do_conversion(const char *fname)
807{
808 struct ftpconv *cp;
809 struct stat st;
810 int o_errno;
811 char *base = NULL;
812 char *cmd, *p, *lp, **argv;
813 StringList *sl;
814
815 o_errno = errno;
816 sl = NULL;
817 cmd = NULL;
818 for (cp = curclass.conversions; cp != NULL; cp = cp->next) {
819 if (cp->suffix == NULL) {
820 syslog(LOG_WARNING,
821 "cp->suffix==NULL in conv list; SHOULDN'T HAPPEN!");
822 continue;
823 }
824 if ((base = strend(fname, cp->suffix)) == NULL)
825 continue;
826 if (cp->types == NULL || cp->disable == NULL ||
827 cp->command == NULL)
828 continue;
829 /* Is it enabled? */
830 if (strcmp(cp->disable, ".") != 0 &&
831 stat(cp->disable, &st) == 0)
832 continue;
833 /* Does the base exist? */
834 if (stat(base, &st) < 0)
835 continue;
836 /* Is the file type ok */
837 if (!filetypematch(cp->types, st.st_mode))
838 continue;
839 break; /* "We have a winner!" */
840 }
841
842 /* If we got through the list, no conversion */
843 if (cp == NULL)
844 goto cleanup_do_conv;
845
846 /* Split up command into an argv */
847 if ((sl = sl_init()) == NULL)
848 goto cleanup_do_conv;
849 cmd = xstrdup(cp->command);
850 p = cmd;
851 while (p) {
852 NEXTWORD(p, lp);
853 if (strcmp(lp, "%s") == 0)
854 lp = base;
855 if (sl_add(sl, xstrdup(lp)) == -1)
856 goto cleanup_do_conv;
857 }
858
859 if (sl_add(sl, NULL) == -1)
860 goto cleanup_do_conv;
861 argv = sl->sl_str;
862 free(cmd);
863 free(sl);
864 return(argv);
865
866 cleanup_do_conv:
867 if (sl)
868 sl_free(sl, 1);
869 free(cmd);
870 errno = o_errno;
871 return(NULL);
872}
873
874/*
875 * Count the number of current connections, reading from
876 * /var/run/ftpd.pids-<class>
877 * Does a kill -0 on each pid in that file, and only counts
878 * processes that exist (or frees the slot if it doesn't).
879 * Adds getpid() to the first free slot. Truncates the file
880 * if possible.
881 */
882void
883count_users(void)
884{
885 char fn[MAXPATHLEN];
886 int fd, i, last;
887 size_t count;
888 pid_t *pids, mypid;
889 struct stat sb;
890
891 (void)strlcpy(fn, _PATH_CLASSPIDS, sizeof(fn));
892 (void)strlcat(fn, curclass.classname, sizeof(fn));
893 pids = NULL;
894 connections = 1;
895
896 if ((fd = open(fn, O_RDWR | O_CREAT, 0600)) == -1)
897 return;
898 if (lockf(fd, F_TLOCK, 0) == -1)
899 goto cleanup_count;
900 if (fstat(fd, &sb) == -1)
901 goto cleanup_count;
902 if ((pids = malloc(sb.st_size + sizeof(pid_t))) == NULL)
903 goto cleanup_count;
904 count = read(fd, pids, sb.st_size);
905 if (count < 0 || count != sb.st_size)
906 goto cleanup_count;
907 count /= sizeof(pid_t);
908 mypid = getpid();
909 last = 0;
910 for (i = 0; i < count; i++) {
911 if (pids[i] == 0)
912 continue;
913 if (kill(pids[i], 0) == -1 && errno != EPERM) {
914 if (mypid != 0) {
915 pids[i] = mypid;
916 mypid = 0;
917 last = i;
918 }
919 } else {
920 connections++;
921 last = i;
922 }
923 }
924 if (mypid != 0) {
925 if (pids[last] != 0)
926 last++;
927 pids[last] = mypid;
928 }
929 count = (last + 1) * sizeof(pid_t);
930 if (lseek(fd, 0, SEEK_SET) == -1)
931 goto cleanup_count;
932 if (write(fd, pids, count) == -1)
933 goto cleanup_count;
934 (void)ftruncate(fd, count);
935
936 cleanup_count:
937 if (lseek(fd, 0, SEEK_SET) != -1)
938 (void)lockf(fd, F_ULOCK, 0);
939 close(fd);
940 REASSIGN(pids, NULL);
941}