ftpd(8): Use libutil's pidfile(3) implementation.
[dragonfly.git] / libexec / ftpd / ftpd.c
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
dc71b7ab 13 * 3. Neither the name of the University nor the names of its contributors
984263bc
MD
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
1de703da 28 *
1de703da 29 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94
bf9ce431 30 * $FreeBSD: src/libexec/ftpd/ftpd.c,v 1.213 2008/12/23 01:23:09 cperciva Exp $
984263bc
MD
31 */
32
984263bc
MD
33/*
34 * FTP server.
35 */
36#include <sys/param.h>
37#include <sys/ioctl.h>
38#include <sys/mman.h>
39#include <sys/socket.h>
40#include <sys/stat.h>
41#include <sys/time.h>
42#include <sys/wait.h>
43
44#include <netinet/in.h>
45#include <netinet/in_systm.h>
46#include <netinet/ip.h>
47#include <netinet/tcp.h>
48
49#define FTP_NAMES
50#include <arpa/ftp.h>
51#include <arpa/inet.h>
52#include <arpa/telnet.h>
53
54#include <ctype.h>
55#include <dirent.h>
56#include <err.h>
57#include <errno.h>
58#include <fcntl.h>
59#include <glob.h>
60#include <limits.h>
61#include <netdb.h>
62#include <pwd.h>
63#include <grp.h>
bf9ce431 64#include <opie.h>
984263bc 65#include <signal.h>
bf9ce431 66#include <stdint.h>
984263bc
MD
67#include <stdio.h>
68#include <stdlib.h>
69#include <string.h>
70#include <syslog.h>
71#include <time.h>
72#include <unistd.h>
73#include <libutil.h>
74#ifdef LOGIN_CAP
75#include <login_cap.h>
76#endif
77
bf9ce431 78#ifdef USE_PAM
984263bc
MD
79#include <security/pam_appl.h>
80#endif
81
82#include "pathnames.h"
83#include "extern.h"
84
984263bc 85#include <stdarg.h>
984263bc
MD
86
87static char version[] = "Version 6.00LS";
88#undef main
89
90extern off_t restart_point;
91extern char cbuf[];
92
984263bc
MD
93union sockunion ctrl_addr;
94union sockunion data_source;
95union sockunion data_dest;
96union sockunion his_addr;
97union sockunion pasv_addr;
98
99int daemon_mode;
100int data;
101int dataport;
102int hostinfo = 1; /* print host-specific info in messages */
103int logged_in;
104struct passwd *pw;
105char *homedir;
106int ftpdebug;
107int timeout = 900; /* timeout after 15 minutes of inactivity */
108int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
109int logging;
110int restricted_data_ports = 1;
111int paranoid = 1; /* be extra careful about security */
112int anon_only = 0; /* Only anonymous ftp allowed */
bf9ce431 113int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */
984263bc
MD
114int guest;
115int dochroot;
bf9ce431 116char *chrootdir;
984263bc
MD
117int dowtmp = 1;
118int stats;
119int statfd = -1;
120int type;
121int form;
122int stru; /* avoid C keyword */
123int mode;
124int usedefault = 1; /* for data transfers */
125int pdata = -1; /* for passive mode */
bf9ce431
PA
126int readonly = 0; /* Server is in readonly mode. */
127int noepsv = 0; /* EPSV command is disabled. */
128int noretr = 0; /* RETR command is disabled. */
129int noguestretr = 0; /* RETR command is disabled for anon users. */
130int noguestmkd = 0; /* MKD command is disabled for anon users. */
131int noguestmod = 1; /* anon users may not modify existing files. */
132
984263bc
MD
133off_t file_size;
134off_t byte_count;
135#if !defined(CMASK) || CMASK == 0
136#undef CMASK
137#define CMASK 027
138#endif
139int defumask = CMASK; /* default umask value */
140char tmpline[7];
141char *hostname;
142int epsvall = 0;
143
144#ifdef VIRTUAL_HOSTING
145char *ftpuser;
146
147static struct ftphost {
148 struct ftphost *next;
149 struct addrinfo *hostinfo;
150 char *hostname;
151 char *anonuser;
152 char *statfile;
153 char *welcome;
154 char *loginmsg;
155} *thishost, *firsthost;
156
157#endif
bf9ce431 158char remotehost[NI_MAXHOST];
984263bc
MD
159char *ident = NULL;
160
bf9ce431
PA
161static char ttyline[20];
162char *tty = ttyline; /* for klogin */
984263bc 163
bf9ce431
PA
164#ifdef USE_PAM
165static int auth_pam(struct passwd**, const char*);
166pam_handle_t *pamh = NULL;
984263bc
MD
167#endif
168
bf9ce431
PA
169static struct opie opiedata;
170static char opieprompt[OPIE_CHALLENGE_MAX+1];
171static int pwok;
172
173char *pid_file = NULL; /* means default location to pidfile(3) */
984263bc
MD
174
175/*
176 * Limit number of pathnames that glob can return.
177 * A limit of 0 indicates the number of pathnames is unlimited.
178 */
179#define MAXGLOBARGS 16384
984263bc
MD
180
181/*
182 * Timeout intervals for retrying connections
183 * to hosts that don't accept PORT cmds. This
184 * is a kludge, but given the problems with TCP...
185 */
186#define SWAITMAX 90 /* wait at most 90 seconds */
187#define SWAITINT 5 /* interval between retries */
188
189int swaitmax = SWAITMAX;
190int swaitint = SWAITINT;
191
192#ifdef SETPROCTITLE
984263bc
MD
193char proctitle[LINE_MAX]; /* initial part of title */
194#endif /* SETPROCTITLE */
195
bf9ce431
PA
196#define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1)
197#define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1)
198#define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt))
199
200static volatile sig_atomic_t recvurg;
201static int transflag; /* NB: for debugging only */
202
203#define STARTXFER flagxfer(1)
204#define ENDXFER flagxfer(0)
984263bc 205
bf9ce431
PA
206#define START_UNSAFE maskurg(1)
207#define END_UNSAFE maskurg(0)
208
209/* It's OK to put an `else' clause after this macro. */
210#define CHECKOOB(action) \
211 if (recvurg) { \
212 recvurg = 0; \
213 if (myoob()) { \
214 ENDXFER; \
215 action; \
216 } \
984263bc
MD
217 }
218
219#ifdef VIRTUAL_HOSTING
bf9ce431
PA
220static void inithosts(int);
221static void selecthost(union sockunion *);
984263bc 222#endif
bf9ce431
PA
223static void ack(char *);
224static void sigurg(int);
225static void maskurg(int);
226static void flagxfer(int);
227static int myoob(void);
228static int checkuser(char *, char *, int, char **);
229static FILE *dataconn(char *, off_t, char *);
230static void dolog(struct sockaddr *);
231static void end_login(void);
232static FILE *getdatasock(char *);
233static int guniquefd(char *, char **);
234static void lostconn(int);
235static void sigquit(int);
236static int receive_data(FILE *, FILE *);
237static int send_data(FILE *, FILE *, size_t, off_t, int);
984263bc 238static struct passwd *
bf9ce431
PA
239 sgetpwnam(char *);
240static char *sgetsave(char *);
241static void reapchild(int);
242static void appendf(char **, char *, ...) __printflike(2, 3);
243static void logcmd(char *, char *, char *, off_t);
244static void logxfer(char *, off_t, time_t);
245static char *doublequote(char *);
246static int *socksetup(int, char *, const char *);
984263bc
MD
247
248int
928722c3 249main(int argc, char *argv[])
984263bc 250{
bf9ce431
PA
251 socklen_t addrlen;
252 int ch, on = 1, tos;
984263bc
MD
253 char *cp, line[LINE_MAX];
254 FILE *fd;
984263bc
MD
255 char *bindname = NULL;
256 const char *bindport = "ftp";
257 int family = AF_UNSPEC;
984263bc
MD
258 struct sigaction sa;
259
260 tzset(); /* in case no timezone database in ~ftp */
261 sigemptyset(&sa.sa_mask);
262 sa.sa_flags = SA_RESTART;
263
bf9ce431
PA
264 /*
265 * Prevent diagnostic messages from appearing on stderr.
266 * We run as a daemon or from inetd; in both cases, there's
267 * more reason in logging to syslog.
268 */
269 freopen(_PATH_DEVNULL, "w", stderr);
270 opterr = 0;
271
272 /*
273 * LOG_NDELAY sets up the logging connection immediately,
274 * necessary for anonymous ftp's that chroot and can't do it later.
275 */
276 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
984263bc
MD
277
278 while ((ch = getopt(argc, argv,
bf9ce431 279 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) {
984263bc
MD
280 switch (ch) {
281 case '4':
bf9ce431 282 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
984263bc
MD
283 break;
284
285 case '6':
bf9ce431
PA
286 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
287 break;
288
289 case '8':
290 assumeutf8 = 1;
984263bc
MD
291 break;
292
293 case 'a':
294 bindname = optarg;
295 break;
296
297 case 'A':
298 anon_only = 1;
299 break;
300
301 case 'd':
302 ftpdebug++;
303 break;
304
305 case 'D':
306 daemon_mode++;
307 break;
308
309 case 'E':
310 noepsv = 1;
311 break;
312
313 case 'h':
314 hostinfo = 0;
315 break;
316
23bf8892
JS
317 case 'H':
318 hostname = optarg;
319 break;
320
984263bc
MD
321 case 'l':
322 logging++; /* > 1 == extra logging */
323 break;
324
325 case 'm':
326 noguestmod = 0;
327 break;
328
329 case 'M':
330 noguestmkd = 1;
331 break;
332
333 case 'o':
334 noretr = 1;
335 break;
336
337 case 'O':
338 noguestretr = 1;
339 break;
340
341 case 'p':
342 pid_file = optarg;
343 break;
344
345 case 'P':
346 bindport = optarg;
347 break;
348
349 case 'r':
350 readonly = 1;
351 break;
352
353 case 'R':
354 paranoid = 0;
355 break;
356
357 case 'S':
358 stats++;
359 break;
360
361 case 't':
362 timeout = atoi(optarg);
363 if (maxtimeout < timeout)
364 maxtimeout = timeout;
365 break;
366
367 case 'T':
368 maxtimeout = atoi(optarg);
369 if (timeout > maxtimeout)
370 timeout = maxtimeout;
371 break;
372
373 case 'u':
374 {
375 long val = 0;
376
377 val = strtol(optarg, &optarg, 8);
378 if (*optarg != '\0' || val < 0)
bf9ce431 379 syslog(LOG_WARNING, "bad value for -u");
984263bc
MD
380 else
381 defumask = val;
382 break;
383 }
384 case 'U':
385 restricted_data_ports = 0;
386 break;
387
388 case 'v':
389 ftpdebug++;
390 break;
391
392 case 'W':
393 dowtmp = 0;
394 break;
395
396 default:
bf9ce431 397 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
984263bc
MD
398 break;
399 }
400 }
401
984263bc 402 if (daemon_mode) {
bf9ce431
PA
403 int *ctl_sock, fd, maxfd = -1, nfds, i;
404 fd_set defreadfds, readfds;
405 pid_t pid;
406 struct pidfh *pfh;
407
408 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) {
409 if (errno == EEXIST) {
410 syslog(LOG_ERR, "%s already running, pid %d",
411 getprogname(), (int)pid);
412 exit(1);
413 }
414 syslog(LOG_WARNING, "pidfile_open: %m");
415 }
984263bc
MD
416
417 /*
418 * Detach from parent.
419 */
420 if (daemon(1, 1) < 0) {
421 syslog(LOG_ERR, "failed to become a daemon");
422 exit(1);
423 }
bf9ce431
PA
424
425 if (pfh != NULL && pidfile_write(pfh) == -1)
426 syslog(LOG_WARNING, "pidfile_write: %m");
427
984263bc 428 sa.sa_handler = reapchild;
bf9ce431
PA
429 sigaction(SIGCHLD, &sa, NULL);
430
431#ifdef VIRTUAL_HOSTING
432 inithosts(family);
433#endif
434
984263bc
MD
435 /*
436 * Open a socket, bind it to the FTP port, and start
437 * listening.
438 */
bf9ce431
PA
439 ctl_sock = socksetup(family, bindname, bindport);
440 if (ctl_sock == NULL)
984263bc 441 exit(1);
bf9ce431
PA
442
443 FD_ZERO(&defreadfds);
444 for (i = 1; i <= *ctl_sock; i++) {
445 FD_SET(ctl_sock[i], &defreadfds);
446 if (listen(ctl_sock[i], 32) < 0) {
447 syslog(LOG_ERR, "control listen: %m");
448 exit(1);
984263bc 449 }
bf9ce431
PA
450 if (maxfd < ctl_sock[i])
451 maxfd = ctl_sock[i];
984263bc 452 }
bf9ce431 453
984263bc
MD
454 /*
455 * Loop forever accepting connection requests and forking off
456 * children to handle them.
457 */
458 while (1) {
bf9ce431
PA
459 FD_COPY(&defreadfds, &readfds);
460 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
461 if (nfds <= 0) {
462 if (nfds < 0 && errno != EINTR)
463 syslog(LOG_WARNING, "select: %m");
464 continue;
984263bc 465 }
bf9ce431
PA
466
467 pid = -1;
468 for (i = 1; i <= *ctl_sock; i++)
469 if (FD_ISSET(ctl_sock[i], &readfds)) {
470 addrlen = sizeof(his_addr);
471 fd = accept(ctl_sock[i],
472 (struct sockaddr *)&his_addr,
473 &addrlen);
474 if (fd == -1) {
475 syslog(LOG_WARNING,
476 "accept: %m");
477 continue;
478 }
479 switch (pid = fork()) {
480 case 0:
481 /* child */
482 dup2(fd, 0);
483 dup2(fd, 1);
484 close(fd);
485 for (i = 1; i <= *ctl_sock; i++)
486 close(ctl_sock[i]);
487 if (pfh != NULL)
488 pidfile_close(pfh);
489 goto gotchild;
490 case -1:
491 syslog(LOG_WARNING, "fork: %m");
492 /* FALLTHROUGH */
493 default:
494 close(fd);
495 }
496 }
984263bc
MD
497 }
498 } else {
499 addrlen = sizeof(his_addr);
500 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
501 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
502 exit(1);
503 }
bf9ce431
PA
504
505#ifdef VIRTUAL_HOSTING
506 if (his_addr.su_family == AF_INET6 &&
507 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
508 family = AF_INET;
509 else
510 family = his_addr.su_family;
511 inithosts(family);
512#endif
984263bc
MD
513 }
514
bf9ce431 515gotchild:
984263bc 516 sa.sa_handler = SIG_DFL;
bf9ce431 517 sigaction(SIGCHLD, &sa, NULL);
984263bc
MD
518
519 sa.sa_handler = sigurg;
520 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
bf9ce431 521 sigaction(SIGURG, &sa, NULL);
984263bc
MD
522
523 sigfillset(&sa.sa_mask); /* block all signals in handler */
524 sa.sa_flags = SA_RESTART;
525 sa.sa_handler = sigquit;
bf9ce431
PA
526 sigaction(SIGHUP, &sa, NULL);
527 sigaction(SIGINT, &sa, NULL);
528 sigaction(SIGQUIT, &sa, NULL);
529 sigaction(SIGTERM, &sa, NULL);
984263bc
MD
530
531 sa.sa_handler = lostconn;
bf9ce431 532 sigaction(SIGPIPE, &sa, NULL);
984263bc
MD
533
534 addrlen = sizeof(ctrl_addr);
535 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
536 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
537 exit(1);
538 }
539 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
540#ifdef VIRTUAL_HOSTING
541 /* select our identity from virtual host table */
542 selecthost(&ctrl_addr);
543#endif
544#ifdef IP_TOS
545 if (ctrl_addr.su_family == AF_INET)
546 {
547 tos = IPTOS_LOWDELAY;
548 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
549 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
550 }
551#endif
552 /*
553 * Disable Nagle on the control channel so that we don't have to wait
554 * for peer's ACK before issuing our next reply.
555 */
556 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
557 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
558
559 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
560
561 /* set this here so klogin can use it... */
bf9ce431 562 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
984263bc
MD
563
564 /* Try to handle urgent data inline */
565#ifdef SO_OOBINLINE
566 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
567 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
568#endif
569
570#ifdef F_SETOWN
571 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
572 syslog(LOG_ERR, "fcntl F_SETOWN: %m");
573#endif
574 dolog((struct sockaddr *)&his_addr);
575 /*
576 * Set up default state
577 */
578 data = -1;
579 type = TYPE_A;
580 form = FORM_N;
581 stru = STRU_F;
582 mode = MODE_S;
583 tmpline[0] = '\0';
584
585 /* If logins are disabled, print out the message. */
586 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
587 while (fgets(line, sizeof(line), fd) != NULL) {
588 if ((cp = strchr(line, '\n')) != NULL)
589 *cp = '\0';
590 lreply(530, "%s", line);
591 }
bf9ce431
PA
592 fflush(stdout);
593 fclose(fd);
984263bc
MD
594 reply(530, "System not available.");
595 exit(0);
596 }
597#ifdef VIRTUAL_HOSTING
bf9ce431 598 fd = fopen(thishost->welcome, "r");
984263bc 599#else
bf9ce431 600 fd = fopen(_PATH_FTPWELCOME, "r");
984263bc 601#endif
bf9ce431 602 if (fd != NULL) {
984263bc
MD
603 while (fgets(line, sizeof(line), fd) != NULL) {
604 if ((cp = strchr(line, '\n')) != NULL)
605 *cp = '\0';
606 lreply(220, "%s", line);
607 }
bf9ce431
PA
608 fflush(stdout);
609 fclose(fd);
984263bc
MD
610 /* reply(220,) must follow */
611 }
612#ifndef VIRTUAL_HOSTING
23bf8892
JS
613 if (hostname == NULL) {
614 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
615 fatalerror("Ran out of memory.");
bf9ce431
PA
616 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
617 hostname[0] = '\0';
23bf8892
JS
618 hostname[MAXHOSTNAMELEN - 1] = '\0';
619 }
984263bc
MD
620#endif
621 if (hostinfo)
622 reply(220, "%s FTP server (%s) ready.", hostname, version);
623 else
624 reply(220, "FTP server ready.");
625 for (;;)
bf9ce431 626 yyparse();
984263bc
MD
627 /* NOTREACHED */
628}
629
630static void
bf9ce431 631lostconn(int signo)
984263bc
MD
632{
633
634 if (ftpdebug)
635 syslog(LOG_DEBUG, "lost connection");
636 dologout(1);
637}
638
639static void
bf9ce431 640sigquit(int signo)
984263bc
MD
641{
642
643 syslog(LOG_ERR, "got signal %d", signo);
644 dologout(1);
645}
646
647#ifdef VIRTUAL_HOSTING
648/*
649 * read in virtual host tables (if they exist)
650 */
651
652static void
bf9ce431 653inithosts(int family)
984263bc
MD
654{
655 int insert;
656 size_t len;
657 FILE *fp;
658 char *cp, *mp, *line;
984263bc
MD
659 char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
660 struct ftphost *hrp, *lhrp;
661 struct addrinfo hints, *res, *ai;
662
663 /*
664 * Fill in the default host information
665 */
23bf8892
JS
666 if (hostname == NULL) {
667 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
668 fatalerror("Ran out of memory.");
bf9ce431 669 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
23bf8892
JS
670 hostname[0] = '\0';
671 hostname[MAXHOSTNAMELEN - 1] = '\0';
672 }
984263bc
MD
673 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
674 fatalerror("Ran out of memory.");
675 hrp->hostname = hostname;
676 hrp->hostinfo = NULL;
677
678 memset(&hints, 0, sizeof(hints));
bf9ce431
PA
679 hints.ai_flags = AI_PASSIVE;
680 hints.ai_family = family;
681 hints.ai_socktype = SOCK_STREAM;
984263bc
MD
682 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
683 hrp->hostinfo = res;
684 hrp->statfile = _PATH_FTPDSTATFILE;
685 hrp->welcome = _PATH_FTPWELCOME;
686 hrp->loginmsg = _PATH_FTPLOGINMESG;
687 hrp->anonuser = "ftp";
688 hrp->next = NULL;
689 thishost = firsthost = lhrp = hrp;
690 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
691 int addrsize, gothost;
692 void *addr;
693 struct hostent *hp;
694
695 while ((line = fgetln(fp, &len)) != NULL) {
696 int i, hp_error;
697
698 /* skip comments */
699 if (line[0] == '#')
700 continue;
701 if (line[len - 1] == '\n') {
702 line[len - 1] = '\0';
703 mp = NULL;
704 } else {
705 if ((mp = malloc(len + 1)) == NULL)
706 fatalerror("Ran out of memory.");
707 memcpy(mp, line, len);
708 mp[len] = '\0';
709 line = mp;
710 }
711 cp = strtok(line, " \t");
712 /* skip empty lines */
713 if (cp == NULL)
714 goto nextline;
715 vhost = cp;
716
717 /* set defaults */
718 anonuser = "ftp";
719 statfile = _PATH_FTPDSTATFILE;
720 welcome = _PATH_FTPWELCOME;
721 loginmsg = _PATH_FTPLOGINMESG;
722
723 /*
724 * Preparse the line so we can use its info
725 * for all the addresses associated with
726 * the virtual host name.
727 * Field 0, the virtual host name, is special:
728 * it's already parsed off and will be strdup'ed
729 * later, after we know its canonical form.
730 */
731 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
732 if (*cp != '-' && (cp = strdup(cp)))
733 switch (i) {
734 case 1: /* anon user permissions */
735 anonuser = cp;
736 break;
737 case 2: /* statistics file */
738 statfile = cp;
739 break;
740 case 3: /* welcome message */
741 welcome = cp;
742 break;
743 case 4: /* login message */
744 loginmsg = cp;
745 break;
746 default: /* programming error */
747 abort();
748 /* NOTREACHED */
749 }
750
984263bc 751 hints.ai_flags = AI_PASSIVE;
bf9ce431
PA
752 hints.ai_family = family;
753 hints.ai_socktype = SOCK_STREAM;
984263bc
MD
754 if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
755 goto nextline;
756 for (ai = res; ai != NULL && ai->ai_addr != NULL;
757 ai = ai->ai_next) {
758
759 gothost = 0;
760 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
761 struct addrinfo *hi;
762
763 for (hi = hrp->hostinfo; hi != NULL;
764 hi = hi->ai_next)
765 if (hi->ai_addrlen == ai->ai_addrlen &&
766 memcmp(hi->ai_addr,
767 ai->ai_addr,
768 ai->ai_addr->sa_len) == 0) {
769 gothost++;
770 break;
771 }
772 if (gothost)
773 break;
774 }
775 if (hrp == NULL) {
776 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
777 goto nextline;
778 hrp->hostname = NULL;
779 insert = 1;
780 } else {
781 if (hrp->hostinfo && hrp->hostinfo != res)
782 freeaddrinfo(hrp->hostinfo);
783 insert = 0; /* host already in the chain */
784 }
785 hrp->hostinfo = res;
786
787 /*
788 * determine hostname to use.
789 * force defined name if there is a valid alias
790 * otherwise fallback to primary hostname
791 */
792 /* XXX: getaddrinfo() can't do alias check */
793 switch(hrp->hostinfo->ai_family) {
794 case AF_INET:
795 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
796 addrsize = sizeof(struct in_addr);
797 break;
798 case AF_INET6:
799 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
800 addrsize = sizeof(struct in6_addr);
801 break;
802 default:
803 /* should not reach here */
804 freeaddrinfo(hrp->hostinfo);
805 if (insert)
806 free(hrp); /*not in chain, can free*/
807 else
808 hrp->hostinfo = NULL; /*mark as blank*/
809 goto nextline;
810 /* NOTREACHED */
811 }
812 if ((hp = getipnodebyaddr(addr, addrsize,
813 hrp->hostinfo->ai_family,
814 &hp_error)) != NULL) {
815 if (strcmp(vhost, hp->h_name) != 0) {
816 if (hp->h_aliases == NULL)
817 vhost = hp->h_name;
818 else {
819 i = 0;
820 while (hp->h_aliases[i] &&
821 strcmp(vhost, hp->h_aliases[i]) != 0)
822 ++i;
823 if (hp->h_aliases[i] == NULL)
824 vhost = hp->h_name;
825 }
826 }
827 }
828 if (hrp->hostname &&
829 strcmp(hrp->hostname, vhost) != 0) {
830 free(hrp->hostname);
831 hrp->hostname = NULL;
832 }
833 if (hrp->hostname == NULL &&
834 (hrp->hostname = strdup(vhost)) == NULL) {
835 freeaddrinfo(hrp->hostinfo);
836 hrp->hostinfo = NULL; /* mark as blank */
837 if (hp)
838 freehostent(hp);
839 goto nextline;
840 }
841 hrp->anonuser = anonuser;
842 hrp->statfile = statfile;
843 hrp->welcome = welcome;
844 hrp->loginmsg = loginmsg;
845 if (insert) {
846 hrp->next = NULL;
847 lhrp->next = hrp;
848 lhrp = hrp;
849 }
850 if (hp)
851 freehostent(hp);
852 }
853nextline:
854 if (mp)
855 free(mp);
856 }
bf9ce431 857 fclose(fp);
984263bc
MD
858 }
859}
860
861static void
bf9ce431 862selecthost(union sockunion *su)
984263bc
MD
863{
864 struct ftphost *hrp;
865 u_int16_t port;
866#ifdef INET6
867 struct in6_addr *mapped_in6 = NULL;
868#endif
869 struct addrinfo *hi;
870
871#ifdef INET6
872 /*
873 * XXX IPv4 mapped IPv6 addr consideraton,
874 * specified in rfc2373.
875 */
876 if (su->su_family == AF_INET6 &&
877 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
878 mapped_in6 = &su->su_sin6.sin6_addr;
879#endif
880
881 hrp = thishost = firsthost; /* default */
882 port = su->su_port;
883 su->su_port = 0;
884 while (hrp != NULL) {
885 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
886 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
887 thishost = hrp;
bf9ce431 888 goto found;
984263bc
MD
889 }
890#ifdef INET6
891 /* XXX IPv4 mapped IPv6 addr consideraton */
892 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
893 (memcmp(&mapped_in6->s6_addr[12],
894 &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
895 sizeof(struct in_addr)) == 0)) {
896 thishost = hrp;
bf9ce431 897 goto found;
984263bc
MD
898 }
899#endif
900 }
901 hrp = hrp->next;
902 }
bf9ce431 903found:
984263bc
MD
904 su->su_port = port;
905 /* setup static variables as appropriate */
906 hostname = thishost->hostname;
907 ftpuser = thishost->anonuser;
908}
909#endif
910
911/*
912 * Helper function for sgetpwnam().
913 */
914static char *
bf9ce431 915sgetsave(char *s)
984263bc 916{
bf9ce431 917 char *new = malloc(strlen(s) + 1);
984263bc
MD
918
919 if (new == NULL) {
bf9ce431 920 reply(421, "Ran out of memory.");
984263bc
MD
921 dologout(1);
922 /* NOTREACHED */
923 }
bf9ce431 924 strcpy(new, s);
984263bc
MD
925 return (new);
926}
927
928/*
929 * Save the result of a getpwnam. Used for USER command, since
930 * the data returned must not be clobbered by any other command
931 * (e.g., globbing).
bf9ce431
PA
932 * NB: The data returned by sgetpwnam() will remain valid until
933 * the next call to this function. Its difference from getpwnam()
934 * is that sgetpwnam() is known to be called from ftpd code only.
984263bc
MD
935 */
936static struct passwd *
bf9ce431 937sgetpwnam(char *name)
984263bc
MD
938{
939 static struct passwd save;
940 struct passwd *p;
941
942 if ((p = getpwnam(name)) == NULL)
943 return (p);
944 if (save.pw_name) {
945 free(save.pw_name);
946 free(save.pw_passwd);
947 free(save.pw_gecos);
948 free(save.pw_dir);
949 free(save.pw_shell);
950 }
951 save = *p;
952 save.pw_name = sgetsave(p->pw_name);
953 save.pw_passwd = sgetsave(p->pw_passwd);
954 save.pw_gecos = sgetsave(p->pw_gecos);
955 save.pw_dir = sgetsave(p->pw_dir);
956 save.pw_shell = sgetsave(p->pw_shell);
957 return (&save);
958}
959
960static int login_attempts; /* number of failed login attempts */
961static int askpasswd; /* had user command, ask for passwd */
962static char curname[MAXLOGNAME]; /* current USER name */
963
964/*
965 * USER command.
966 * Sets global passwd pointer pw if named account exists and is acceptable;
967 * sets askpasswd if a PASS command is expected. If logged in previously,
968 * need to reset state. If name is "ftp" or "anonymous", the name is not in
969 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
970 * If account doesn't exist, ask for passwd anyway. Otherwise, check user
971 * requesting login privileges. Disallow anyone who does not have a standard
972 * shell as returned by getusershell(). Disallow anyone mentioned in the file
973 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
974 */
975void
bf9ce431 976user(char *name)
984263bc
MD
977{
978 char *cp, *shell;
979
980 if (logged_in) {
981 if (guest) {
982 reply(530, "Can't change user from guest login.");
983 return;
984 } else if (dochroot) {
985 reply(530, "Can't change user from chroot user.");
986 return;
987 }
988 end_login();
989 }
990
991 guest = 0;
bf9ce431
PA
992#ifdef VIRTUAL_HOSTING
993 pw = sgetpwnam(thishost->anonuser);
994#else
995 pw = sgetpwnam("ftp");
996#endif
984263bc
MD
997 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
998 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
999 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
1000 reply(530, "User %s access denied.", name);
bf9ce431 1001 else if (pw != NULL) {
984263bc
MD
1002 guest = 1;
1003 askpasswd = 1;
1004 reply(331,
1005 "Guest login ok, send your email address as password.");
1006 } else
1007 reply(530, "User %s unknown.", name);
1008 if (!askpasswd && logging)
1009 syslog(LOG_NOTICE,
1010 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1011 return;
1012 }
1013 if (anon_only != 0) {
1014 reply(530, "Sorry, only anonymous ftp allowed.");
1015 return;
1016 }
1017
1018 if ((pw = sgetpwnam(name))) {
1019 if ((shell = pw->pw_shell) == NULL || *shell == 0)
1020 shell = _PATH_BSHELL;
bf9ce431 1021 setusershell();
984263bc
MD
1022 while ((cp = getusershell()) != NULL)
1023 if (strcmp(cp, shell) == 0)
1024 break;
1025 endusershell();
1026
1027 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
1028 reply(530, "User %s access denied.", name);
1029 if (logging)
1030 syslog(LOG_NOTICE,
1031 "FTP LOGIN REFUSED FROM %s, %s",
1032 remotehost, name);
bf9ce431 1033 pw = NULL;
984263bc
MD
1034 return;
1035 }
1036 }
1037 if (logging)
1038 strncpy(curname, name, sizeof(curname)-1);
bf9ce431
PA
1039
1040 pwok = 0;
1041#ifdef USE_PAM
1042 /* XXX Kluge! The conversation mechanism needs to be fixed. */
984263bc 1043#endif
bf9ce431
PA
1044 if (opiechallenge(&opiedata, name, opieprompt) == 0) {
1045 pwok = (pw != NULL) &&
1046 opieaccessfile(remotehost) &&
1047 opiealways(pw->pw_dir);
1048 reply(331, "Response to %s %s for %s.",
1049 opieprompt, pwok ? "requested" : "required", name);
1050 } else {
1051 pwok = 1;
1052 reply(331, "Password required for %s.", name);
1053 }
984263bc
MD
1054 askpasswd = 1;
1055 /*
1056 * Delay before reading passwd after first failed
1057 * attempt to slow down passwd-guessing programs.
1058 */
1059 if (login_attempts)
bf9ce431 1060 sleep(login_attempts);
984263bc
MD
1061}
1062
1063/*
1064 * Check if a user is in the file "fname",
1065 * return a pointer to a malloc'd string with the rest
1066 * of the matching line in "residue" if not NULL.
1067 */
1068static int
bf9ce431 1069checkuser(char *fname, char *name, int pwset, char **residue)
984263bc
MD
1070{
1071 FILE *fd;
1072 int found = 0;
1073 size_t len;
1074 char *line, *mp, *p;
1075
1076 if ((fd = fopen(fname, "r")) != NULL) {
1077 while (!found && (line = fgetln(fd, &len)) != NULL) {
1078 /* skip comments */
1079 if (line[0] == '#')
1080 continue;
1081 if (line[len - 1] == '\n') {
1082 line[len - 1] = '\0';
1083 mp = NULL;
1084 } else {
1085 if ((mp = malloc(len + 1)) == NULL)
1086 fatalerror("Ran out of memory.");
1087 memcpy(mp, line, len);
1088 mp[len] = '\0';
1089 line = mp;
1090 }
1091 /* avoid possible leading and trailing whitespace */
1092 p = strtok(line, " \t");
1093 /* skip empty lines */
1094 if (p == NULL)
1095 goto nextline;
1096 /*
1097 * if first chr is '@', check group membership
1098 */
1099 if (p[0] == '@') {
1100 int i = 0;
1101 struct group *grp;
1102
1103 if (p[1] == '\0') /* single @ matches anyone */
1104 found = 1;
1105 else {
1106 if ((grp = getgrnam(p+1)) == NULL)
1107 goto nextline;
1108 /*
1109 * Check user's default group
1110 */
1111 if (pwset && grp->gr_gid == pw->pw_gid)
1112 found = 1;
1113 /*
1114 * Check supplementary groups
1115 */
1116 while (!found && grp->gr_mem[i])
1117 found = strcmp(name,
1118 grp->gr_mem[i++])
1119 == 0;
1120 }
1121 }
1122 /*
1123 * Otherwise, just check for username match
1124 */
1125 else
1126 found = strcmp(p, name) == 0;
1127 /*
1128 * Save the rest of line to "residue" if matched
1129 */
1130 if (found && residue) {
1131 if ((p = strtok(NULL, "")) != NULL)
1132 p += strspn(p, " \t");
1133 if (p && *p) {
1134 if ((*residue = strdup(p)) == NULL)
1135 fatalerror("Ran out of memory.");
1136 } else
1137 *residue = NULL;
1138 }
1139nextline:
1140 if (mp)
1141 free(mp);
1142 }
bf9ce431 1143 fclose(fd);
984263bc
MD
1144 }
1145 return (found);
1146}
1147
1148/*
1149 * Terminate login as previous user, if any, resetting state;
1150 * used when USER command is given or login fails.
1151 */
1152static void
bf9ce431 1153end_login(void)
984263bc 1154{
bf9ce431
PA
1155#ifdef USE_PAM
1156 int e;
1157#endif
984263bc 1158
bf9ce431 1159 seteuid(0);
984263bc
MD
1160 if (logged_in && dowtmp)
1161 ftpd_logwtmp(ttyline, "", NULL);
1162 pw = NULL;
1163#ifdef LOGIN_CAP
bf9ce431
PA
1164 /* XXX Missing LOGIN_SETMAC */
1165 setusercontext(NULL, getpwuid(0), 0,
984263bc 1166 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK);
bf9ce431
PA
1167#endif
1168#ifdef USE_PAM
1169 if (pamh) {
1170 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
1171 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1172 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
1173 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
1174 if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
1175 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1176 pamh = NULL;
1177 }
984263bc
MD
1178#endif
1179 logged_in = 0;
1180 guest = 0;
1181 dochroot = 0;
1182}
1183
bf9ce431 1184#ifdef USE_PAM
984263bc
MD
1185
1186/*
1187 * the following code is stolen from imap-uw PAM authentication module and
1188 * login.c
1189 */
1190#define COPY_STRING(s) (s ? strdup(s) : NULL)
1191
1192struct cred_t {
1193 const char *uname; /* user name */
1194 const char *pass; /* password */
1195};
1196typedef struct cred_t cred_t;
1197
1198static int
1199auth_conv(int num_msg, const struct pam_message **msg,
1200 struct pam_response **resp, void *appdata)
1201{
1202 int i;
1203 cred_t *cred = (cred_t *) appdata;
bf9ce431
PA
1204 struct pam_response *reply;
1205
1206 reply = calloc(num_msg, sizeof *reply);
1207 if (reply == NULL)
1208 return PAM_BUF_ERR;
984263bc
MD
1209
1210 for (i = 0; i < num_msg; i++) {
1211 switch (msg[i]->msg_style) {
1212 case PAM_PROMPT_ECHO_ON: /* assume want user name */
1213 reply[i].resp_retcode = PAM_SUCCESS;
1214 reply[i].resp = COPY_STRING(cred->uname);
1215 /* PAM frees resp. */
1216 break;
1217 case PAM_PROMPT_ECHO_OFF: /* assume want password */
1218 reply[i].resp_retcode = PAM_SUCCESS;
1219 reply[i].resp = COPY_STRING(cred->pass);
1220 /* PAM frees resp. */
1221 break;
1222 case PAM_TEXT_INFO:
1223 case PAM_ERROR_MSG:
1224 reply[i].resp_retcode = PAM_SUCCESS;
1225 reply[i].resp = NULL;
1226 break;
1227 default: /* unknown message style */
1228 free(reply);
1229 return PAM_CONV_ERR;
1230 }
1231 }
1232
1233 *resp = reply;
1234 return PAM_SUCCESS;
1235}
1236
1237/*
1238 * Attempt to authenticate the user using PAM. Returns 0 if the user is
1239 * authenticated, or 1 if not authenticated. If some sort of PAM system
1240 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1241 * function returns -1. This can be used as an indication that we should
1242 * fall back to a different authentication mechanism.
1243 */
1244static int
1245auth_pam(struct passwd **ppw, const char *pass)
1246{
984263bc
MD
1247 const char *tmpl_user;
1248 const void *item;
1249 int rval;
1250 int e;
1251 cred_t auth_cred = { (*ppw)->pw_name, pass };
1252 struct pam_conv conv = { &auth_conv, &auth_cred };
1253
1254 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1255 if (e != PAM_SUCCESS) {
bf9ce431
PA
1256 /*
1257 * In OpenPAM, it's OK to pass NULL to pam_strerror()
1258 * if context creation has failed in the first place.
1259 */
1260 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
984263bc
MD
1261 return -1;
1262 }
1263
1264 e = pam_set_item(pamh, PAM_RHOST, remotehost);
1265 if (e != PAM_SUCCESS) {
1266 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1267 pam_strerror(pamh, e));
bf9ce431
PA
1268 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1269 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1270 }
1271 pamh = NULL;
984263bc
MD
1272 return -1;
1273 }
1274
1275 e = pam_authenticate(pamh, 0);
1276 switch (e) {
1277 case PAM_SUCCESS:
1278 /*
1279 * With PAM we support the concept of a "template"
1280 * user. The user enters a login name which is
1281 * authenticated by PAM, usually via a remote service
1282 * such as RADIUS or TACACS+. If authentication
1283 * succeeds, a different but related "template" name
1284 * is used for setting the credentials, shell, and
1285 * home directory. The name the user enters need only
1286 * exist on the remote authentication server, but the
1287 * template name must be present in the local password
1288 * database.
1289 *
1290 * This is supported by two various mechanisms in the
1291 * individual modules. However, from the application's
1292 * point of view, the template user is always passed
1293 * back as a changed value of the PAM_USER item.
1294 */
1295 if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1296 PAM_SUCCESS) {
1297 tmpl_user = (const char *) item;
1298 if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1299 *ppw = getpwnam(tmpl_user);
1300 } else
1301 syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1302 pam_strerror(pamh, e));
1303 rval = 0;
1304 break;
1305
1306 case PAM_AUTH_ERR:
1307 case PAM_USER_UNKNOWN:
1308 case PAM_MAXTRIES:
1309 rval = 1;
1310 break;
1311
1312 default:
bf9ce431 1313 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
984263bc
MD
1314 rval = -1;
1315 break;
1316 }
1317
bf9ce431
PA
1318 if (rval == 0) {
1319 e = pam_acct_mgmt(pamh, 0);
1320 if (e != PAM_SUCCESS) {
1321 syslog(LOG_ERR, "pam_acct_mgmt: %s",
1322 pam_strerror(pamh, e));
1323 rval = 1;
1324 }
1325 }
1326
1327 if (rval != 0) {
1328 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1329 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1330 }
1331 pamh = NULL;
984263bc
MD
1332 }
1333 return rval;
1334}
1335
bf9ce431 1336#endif /* USE_PAM */
984263bc
MD
1337
1338void
bf9ce431 1339pass(char *passwd)
984263bc
MD
1340{
1341 int rval;
1342 FILE *fd;
1343#ifdef LOGIN_CAP
1344 login_cap_t *lc = NULL;
1345#endif
bf9ce431
PA
1346#ifdef USE_PAM
1347 int e;
1348#endif
984263bc 1349 char *residue = NULL;
bf9ce431 1350 char *xpasswd;
984263bc
MD
1351
1352 if (logged_in || askpasswd == 0) {
1353 reply(503, "Login with USER first.");
1354 return;
1355 }
1356 askpasswd = 0;
1357 if (!guest) { /* "ftp" is only account allowed no password */
1358 if (pw == NULL) {
1359 rval = 1; /* failure below */
1360 goto skip;
1361 }
bf9ce431 1362#ifdef USE_PAM
984263bc 1363 rval = auth_pam(&pw, passwd);
bf9ce431
PA
1364 if (rval >= 0) {
1365 opieunlock();
984263bc 1366 goto skip;
bf9ce431 1367 }
984263bc 1368#endif
bf9ce431
PA
1369 if (opieverify(&opiedata, passwd) == 0)
1370 xpasswd = pw->pw_passwd;
1371 else if (pwok) {
1372 xpasswd = crypt(passwd, pw->pw_passwd);
1373 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
1374 xpasswd = ":";
1375 } else {
1376 rval = 1;
1377 goto skip;
1378 }
1379 rval = strcmp(pw->pw_passwd, xpasswd);
1380 if (pw->pw_expire && time(NULL) >= pw->pw_expire)
984263bc
MD
1381 rval = 1; /* failure */
1382skip:
1383 /*
1384 * If rval == 1, the user failed the authentication check
1385 * above. If rval == 0, either PAM or local authentication
1386 * succeeded.
1387 */
1388 if (rval) {
1389 reply(530, "Login incorrect.");
1390 if (logging) {
1391 syslog(LOG_NOTICE,
1392 "FTP LOGIN FAILED FROM %s",
1393 remotehost);
1394 syslog(LOG_AUTHPRIV | LOG_NOTICE,
1395 "FTP LOGIN FAILED FROM %s, %s",
1396 remotehost, curname);
1397 }
1398 pw = NULL;
1399 if (login_attempts++ >= 5) {
1400 syslog(LOG_NOTICE,
1401 "repeated login failures from %s",
1402 remotehost);
1403 exit(0);
1404 }
1405 return;
1406 }
1407 }
984263bc 1408 login_attempts = 0; /* this time successful */
bf9ce431 1409 if (setegid(pw->pw_gid) < 0) {
984263bc
MD
1410 reply(550, "Can't set gid.");
1411 return;
1412 }
1413 /* May be overridden by login.conf */
bf9ce431 1414 umask(defumask);
984263bc
MD
1415#ifdef LOGIN_CAP
1416 if ((lc = login_getpwclass(pw)) != NULL) {
bf9ce431 1417 char remote_ip[NI_MAXHOST];
984263bc 1418
bf9ce431 1419 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
984263bc 1420 remote_ip, sizeof(remote_ip) - 1, NULL, 0,
bf9ce431
PA
1421 NI_NUMERICHOST))
1422 *remote_ip = 0;
984263bc
MD
1423 remote_ip[sizeof(remote_ip) - 1] = 0;
1424 if (!auth_hostok(lc, remotehost, remote_ip)) {
1425 syslog(LOG_INFO|LOG_AUTH,
1426 "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1427 pw->pw_name);
bf9ce431 1428 reply(530, "Permission denied.");
984263bc
MD
1429 pw = NULL;
1430 return;
1431 }
1432 if (!auth_timeok(lc, time(NULL))) {
bf9ce431 1433 reply(530, "Login not available right now.");
984263bc
MD
1434 pw = NULL;
1435 return;
1436 }
1437 }
bf9ce431
PA
1438 /* XXX Missing LOGIN_SETMAC */
1439 setusercontext(lc, pw, 0,
984263bc
MD
1440 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1441 LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1442#else
1443 setlogin(pw->pw_name);
bf9ce431
PA
1444 initgroups(pw->pw_name, pw->pw_gid);
1445#endif
1446
1447#ifdef USE_PAM
1448 if (pamh) {
1449 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
1450 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
1451 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
1452 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1453 }
1454 }
984263bc
MD
1455#endif
1456
1457 /* open wtmp before chroot */
1458 if (dowtmp)
1459 ftpd_logwtmp(ttyline, pw->pw_name,
1460 (struct sockaddr *)&his_addr);
1461 logged_in = 1;
1462
1463 if (guest && stats && statfd < 0)
1464#ifdef VIRTUAL_HOSTING
bf9ce431 1465 statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
984263bc 1466#else
bf9ce431 1467 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
984263bc 1468#endif
bf9ce431 1469 if (statfd < 0)
984263bc
MD
1470 stats = 0;
1471
1472 dochroot =
1473 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
1474#ifdef LOGIN_CAP /* Allow login.conf configuration as well */
1475 || login_getcapbool(lc, "ftp-chroot", 0)
1476#endif
1477 ;
1478 chrootdir = NULL;
1479 /*
1480 * For a chrooted local user,
1481 * a) see whether ftpchroot(5) specifies a chroot directory,
1482 * b) extract the directory pathname from the line,
1483 * c) expand it to the absolute pathname if necessary.
1484 */
1485 if (dochroot && residue &&
bf9ce431
PA
1486 (chrootdir = strtok(residue, " \t")) != NULL) {
1487 if (chrootdir[0] != '/')
1488 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1489 else
1490 chrootdir = strdup(chrootdir); /* make it permanent */
984263bc
MD
1491 if (chrootdir == NULL)
1492 fatalerror("Ran out of memory.");
1493 }
1494 if (guest || dochroot) {
1495 /*
1496 * If no chroot directory set yet, use the login directory.
1497 * Copy it so it can be modified while pw->pw_dir stays intact.
1498 */
1499 if (chrootdir == NULL &&
1500 (chrootdir = strdup(pw->pw_dir)) == NULL)
1501 fatalerror("Ran out of memory.");
1502 /*
1503 * Check for the "/chroot/./home" syntax,
1504 * separate the chroot and home directory pathnames.
1505 */
1506 if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1507 *(homedir++) = '\0'; /* wipe '/' */
1508 homedir++; /* skip '.' */
984263bc
MD
1509 } else {
1510 /*
1511 * We MUST do a chdir() after the chroot. Otherwise
1512 * the old current directory will be accessible as "."
1513 * outside the new root!
1514 */
1515 homedir = "/";
1516 }
1517 /*
1518 * Finally, do chroot()
1519 */
1520 if (chroot(chrootdir) < 0) {
1521 reply(550, "Can't change root.");
1522 goto bad;
1523 }
1524 } else /* real user w/o chroot */
1525 homedir = pw->pw_dir;
1526 /*
1527 * Set euid *before* doing chdir() so
1528 * a) the user won't be carried to a directory that he couldn't reach
1529 * on his own due to no permission to upper path components,
1530 * b) NFS mounted homedirs w/restrictive permissions will be accessible
1531 * (uid 0 has no root power over NFS if not mapped explicitly.)
1532 */
bf9ce431 1533 if (seteuid(pw->pw_uid) < 0) {
984263bc
MD
1534 reply(550, "Can't set uid.");
1535 goto bad;
1536 }
1537 if (chdir(homedir) < 0) {
1538 if (guest || dochroot) {
1539 reply(550, "Can't change to base directory.");
1540 goto bad;
1541 } else {
1542 if (chdir("/") < 0) {
1543 reply(550, "Root is inaccessible.");
1544 goto bad;
1545 }
bf9ce431 1546 lreply(230, "No directory! Logging in with home=/.");
984263bc
MD
1547 }
1548 }
1549
1550 /*
1551 * Display a login message, if it exists.
1552 * N.B. reply(230,) must follow the message.
1553 */
1554#ifdef VIRTUAL_HOSTING
bf9ce431 1555 fd = fopen(thishost->loginmsg, "r");
984263bc 1556#else
bf9ce431 1557 fd = fopen(_PATH_FTPLOGINMESG, "r");
984263bc 1558#endif
bf9ce431 1559 if (fd != NULL) {
984263bc
MD
1560 char *cp, line[LINE_MAX];
1561
1562 while (fgets(line, sizeof(line), fd) != NULL) {
1563 if ((cp = strchr(line, '\n')) != NULL)
1564 *cp = '\0';
1565 lreply(230, "%s", line);
1566 }
bf9ce431
PA
1567 fflush(stdout);
1568 fclose(fd);
984263bc
MD
1569 }
1570 if (guest) {
1571 if (ident != NULL)
1572 free(ident);
1573 ident = strdup(passwd);
1574 if (ident == NULL)
1575 fatalerror("Ran out of memory.");
1576
1577 reply(230, "Guest login ok, access restrictions apply.");
1578#ifdef SETPROCTITLE
1579#ifdef VIRTUAL_HOSTING
1580 if (thishost != firsthost)
1581 snprintf(proctitle, sizeof(proctitle),
1582 "%s: anonymous(%s)/%s", remotehost, hostname,
1583 passwd);
1584 else
1585#endif
1586 snprintf(proctitle, sizeof(proctitle),
1587 "%s: anonymous/%s", remotehost, passwd);
1588 setproctitle("%s", proctitle);
1589#endif /* SETPROCTITLE */
1590 if (logging)
1591 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1592 remotehost, passwd);
1593 } else {
1594 if (dochroot)
1595 reply(230, "User %s logged in, "
1596 "access restrictions apply.", pw->pw_name);
1597 else
1598 reply(230, "User %s logged in.", pw->pw_name);
1599
1600#ifdef SETPROCTITLE
1601 snprintf(proctitle, sizeof(proctitle),
1602 "%s: user/%s", remotehost, pw->pw_name);
1603 setproctitle("%s", proctitle);
1604#endif /* SETPROCTITLE */
1605 if (logging)
1606 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1607 remotehost, pw->pw_name);
1608 }
bf9ce431
PA
1609 if (logging && (guest || dochroot))
1610 syslog(LOG_INFO, "session root changed to %s", chrootdir);
984263bc
MD
1611#ifdef LOGIN_CAP
1612 login_close(lc);
1613#endif
984263bc
MD
1614 if (residue)
1615 free(residue);
1616 return;
1617bad:
1618 /* Forget all about it... */
1619#ifdef LOGIN_CAP
1620 login_close(lc);
1621#endif
984263bc
MD
1622 if (residue)
1623 free(residue);
1624 end_login();
1625}
1626
1627void
bf9ce431 1628retrieve(char *cmd, char *name)
984263bc
MD
1629{
1630 FILE *fin, *dout;
1631 struct stat st;
bf9ce431 1632 int (*closefunc)(FILE *);
984263bc
MD
1633 time_t start;
1634
678e8cc6 1635 if (cmd == NULL) {
984263bc
MD
1636 fin = fopen(name, "r"), closefunc = fclose;
1637 st.st_size = 0;
1638 } else {
1639 char line[BUFSIZ];
1640
bf9ce431 1641 snprintf(line, sizeof(line), cmd, name), name = line;
984263bc
MD
1642 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1643 st.st_size = -1;
1644 st.st_blksize = BUFSIZ;
1645 }
1646 if (fin == NULL) {
1647 if (errno != 0) {
1648 perror_reply(550, name);
678e8cc6 1649 if (cmd == NULL) {
984263bc
MD
1650 LOGCMD("get", name);
1651 }
1652 }
1653 return;
1654 }
1655 byte_count = -1;
678e8cc6 1656 if (cmd == NULL) {
984263bc
MD
1657 if (fstat(fileno(fin), &st) < 0) {
1658 perror_reply(550, name);
1659 goto done;
1660 }
1661 if (!S_ISREG(st.st_mode)) {
bf9ce431
PA
1662 /*
1663 * Never sending a raw directory is a workaround
1664 * for buggy clients that will attempt to RETR
1665 * a directory before listing it, e.g., Mozilla.
1666 * Preventing a guest from getting irregular files
1667 * is a simple security measure.
1668 */
1669 if (S_ISDIR(st.st_mode) || guest) {
984263bc
MD
1670 reply(550, "%s: not a plain file.", name);
1671 goto done;
1672 }
1673 st.st_size = -1;
1674 /* st.st_blksize is set for all descriptor types */
1675 }
1676 }
1677 if (restart_point) {
1678 if (type == TYPE_A) {
1679 off_t i, n;
1680 int c;
1681
1682 n = restart_point;
1683 i = 0;
1684 while (i++ < n) {
1685 if ((c=getc(fin)) == EOF) {
1686 perror_reply(550, name);
1687 goto done;
1688 }
1689 if (c == '\n')
1690 i++;
1691 }
1692 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1693 perror_reply(550, name);
1694 goto done;
1695 }
1696 }
1697 dout = dataconn(name, st.st_size, "w");
1698 if (dout == NULL)
1699 goto done;
1700 time(&start);
1701 send_data(fin, dout, st.st_blksize, st.st_size,
678e8cc6
SW
1702 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode));
1703 if (cmd == NULL && guest && stats && byte_count > 0)
bf9ce431
PA
1704 logxfer(name, byte_count, start);
1705 fclose(dout);
984263bc
MD
1706 data = -1;
1707 pdata = -1;
1708done:
678e8cc6 1709 if (cmd == NULL)
984263bc
MD
1710 LOGBYTES("get", name, byte_count);
1711 (*closefunc)(fin);
1712}
1713
1714void
bf9ce431 1715store(char *name, char *mode, int unique)
984263bc
MD
1716{
1717 int fd;
1718 FILE *fout, *din;
bf9ce431 1719 int (*closefunc)(FILE *);
984263bc
MD
1720
1721 if (*mode == 'a') { /* APPE */
1722 if (unique) {
1723 /* Programming error */
1724 syslog(LOG_ERR, "Internal: unique flag to APPE");
1725 unique = 0;
1726 }
1727 if (guest && noguestmod) {
bf9ce431 1728 reply(550, "Appending to existing file denied.");
984263bc
MD
1729 goto err;
1730 }
1731 restart_point = 0; /* not affected by preceding REST */
1732 }
1733 if (unique) /* STOU overrides REST */
1734 restart_point = 0;
1735 if (guest && noguestmod) {
1736 if (restart_point) { /* guest STOR w/REST */
bf9ce431 1737 reply(550, "Modifying existing file denied.");
984263bc
MD
1738 goto err;
1739 } else /* treat guest STOR as STOU */
1740 unique = 1;
1741 }
1742
1743 if (restart_point)
1744 mode = "r+"; /* so ASCII manual seek can work */
1745 if (unique) {
1746 if ((fd = guniquefd(name, &name)) < 0)
1747 goto err;
1748 fout = fdopen(fd, mode);
1749 } else
1750 fout = fopen(name, mode);
1751 closefunc = fclose;
1752 if (fout == NULL) {
1753 perror_reply(553, name);
1754 goto err;
1755 }
1756 byte_count = -1;
1757 if (restart_point) {
1758 if (type == TYPE_A) {
1759 off_t i, n;
1760 int c;
1761
1762 n = restart_point;
1763 i = 0;
1764 while (i++ < n) {
1765 if ((c=getc(fout)) == EOF) {
1766 perror_reply(550, name);
1767 goto done;
1768 }
1769 if (c == '\n')
1770 i++;
1771 }
1772 /*
1773 * We must do this seek to "current" position
1774 * because we are changing from reading to
1775 * writing.
1776 */
bf9ce431 1777 if (fseeko(fout, 0, SEEK_CUR) < 0) {
984263bc
MD
1778 perror_reply(550, name);
1779 goto done;
1780 }
1781 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1782 perror_reply(550, name);
1783 goto done;
1784 }
1785 }
bf9ce431 1786 din = dataconn(name, -1, "r");
984263bc
MD
1787 if (din == NULL)
1788 goto done;
1789 if (receive_data(din, fout) == 0) {
1790 if (unique)
1791 reply(226, "Transfer complete (unique file name:%s).",
1792 name);
1793 else
1794 reply(226, "Transfer complete.");
1795 }
bf9ce431 1796 fclose(din);
984263bc
MD
1797 data = -1;
1798 pdata = -1;
1799done:
1800 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1801 (*closefunc)(fout);
1802 return;
1803err:
1804 LOGCMD(*mode == 'a' ? "append" : "put" , name);
1805 return;
1806}
1807
1808static FILE *
bf9ce431 1809getdatasock(char *mode)
984263bc
MD
1810{
1811 int on = 1, s, t, tries;
1812
1813 if (data >= 0)
1814 return (fdopen(data, mode));
984263bc
MD
1815
1816 s = socket(data_dest.su_family, SOCK_STREAM, 0);
1817 if (s < 0)
1818 goto bad;
1819 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1820 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1821 /* anchor socket to avoid multi-homing problems */
1822 data_source = ctrl_addr;
1823 data_source.su_port = htons(dataport);
bf9ce431 1824 seteuid(0);
984263bc 1825 for (tries = 1; ; tries++) {
bf9ce431
PA
1826 /*
1827 * We should loop here since it's possible that
1828 * another ftpd instance has passed this point and is
1829 * trying to open a data connection in active mode now.
1830 * Until the other connection is opened, we'll be getting
1831 * EADDRINUSE because no SOCK_STREAM sockets in the system
1832 * can share both local and remote addresses, localIP:20
1833 * and *:* in this case.
1834 */
984263bc
MD
1835 if (bind(s, (struct sockaddr *)&data_source,
1836 data_source.su_len) >= 0)
1837 break;
1838 if (errno != EADDRINUSE || tries > 10)
1839 goto bad;
1840 sleep(tries);
1841 }
bf9ce431 1842 seteuid(pw->pw_uid);
984263bc
MD
1843#ifdef IP_TOS
1844 if (data_source.su_family == AF_INET)
1845 {
1846 on = IPTOS_THROUGHPUT;
1847 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1848 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1849 }
1850#endif
1851#ifdef TCP_NOPUSH
1852 /*
1853 * Turn off push flag to keep sender TCP from sending short packets
bf9ce431 1854 * at the boundaries of each write().
984263bc
MD
1855 */
1856 on = 1;
1857 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1858 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1859#endif
984263bc
MD
1860 return (fdopen(s, mode));
1861bad:
1862 /* Return the real value of errno (close may change it) */
1863 t = errno;
bf9ce431
PA
1864 seteuid(pw->pw_uid);
1865 close(s);
984263bc
MD
1866 errno = t;
1867 return (NULL);
1868}
1869
1870static FILE *
bf9ce431 1871dataconn(char *name, off_t size, char *mode)
984263bc
MD
1872{
1873 char sizebuf[32];
1874 FILE *file;
1875 int retry = 0, tos, conerrno;
1876
1877 file_size = size;
1878 byte_count = 0;
bf9ce431
PA
1879 if (size != -1)
1880 snprintf(sizebuf, sizeof(sizebuf),
1881 " (%jd bytes)", (intmax_t)size);
984263bc
MD
1882 else
1883 *sizebuf = '\0';
1884 if (pdata >= 0) {
1885 union sockunion from;
bf9ce431
PA
1886 socklen_t fromlen = ctrl_addr.su_len;
1887 int flags, s;
984263bc
MD
1888 struct timeval timeout;
1889 fd_set set;
1890
1891 FD_ZERO(&set);
1892 FD_SET(pdata, &set);
1893
1894 timeout.tv_usec = 0;
1895 timeout.tv_sec = 120;
1896
1897 /*
1898 * Granted a socket is in the blocking I/O mode,
1899 * accept() will block after a successful select()
1900 * if the selected connection dies in between.
1901 * Therefore set the non-blocking I/O flag here.
1902 */
1903 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1904 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1905 goto pdata_err;
bf9ce431 1906 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
984263bc
MD
1907 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1908 goto pdata_err;
bf9ce431 1909 close(pdata);
984263bc
MD
1910 pdata = s;
1911 /*
1912 * Unset the inherited non-blocking I/O flag
1913 * on the child socket so stdio can work on it.
1914 */
1915 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1916 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
1917 goto pdata_err;
1918#ifdef IP_TOS
1919 if (from.su_family == AF_INET)
1920 {
1921 tos = IPTOS_THROUGHPUT;
1922 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
1923 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
1924 }
1925#endif
1926 reply(150, "Opening %s mode data connection for '%s'%s.",
1927 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1928 return (fdopen(pdata, mode));
1929pdata_err:
1930 reply(425, "Can't open data connection.");
bf9ce431 1931 close(pdata);
984263bc
MD
1932 pdata = -1;
1933 return (NULL);
1934 }
1935 if (data >= 0) {
1936 reply(125, "Using existing data connection for '%s'%s.",
1937 name, sizebuf);
1938 usedefault = 1;
1939 return (fdopen(data, mode));
1940 }
1941 if (usedefault)
1942 data_dest = his_addr;
1943 usedefault = 1;
1944 do {
1945 file = getdatasock(mode);
1946 if (file == NULL) {
bf9ce431
PA
1947 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];
1948
1949 if (getnameinfo((struct sockaddr *)&data_source,
1950 data_source.su_len,
1951 hostbuf, sizeof(hostbuf) - 1,
1952 portbuf, sizeof(portbuf) - 1,
1953 NI_NUMERICHOST|NI_NUMERICSERV))
1954 *hostbuf = *portbuf = 0;
1955 hostbuf[sizeof(hostbuf) - 1] = 0;
1956 portbuf[sizeof(portbuf) - 1] = 0;
984263bc
MD
1957 reply(425, "Can't create data socket (%s,%s): %s.",
1958 hostbuf, portbuf, strerror(errno));
1959 return (NULL);
1960 }
1961 data = fileno(file);
1962 conerrno = 0;
1963 if (connect(data, (struct sockaddr *)&data_dest,
1964 data_dest.su_len) == 0)
1965 break;
1966 conerrno = errno;
bf9ce431 1967 fclose(file);
984263bc
MD
1968 data = -1;
1969 if (conerrno == EADDRINUSE) {
bf9ce431 1970 sleep(swaitint);
984263bc
MD
1971 retry += swaitint;
1972 } else {
1973 break;
1974 }
1975 } while (retry <= swaitmax);
1976 if (conerrno != 0) {
bf9ce431
PA
1977 reply(425, "Can't build data connection: %s.",
1978 strerror(conerrno));
984263bc
MD
1979 return (NULL);
1980 }
1981 reply(150, "Opening %s mode data connection for '%s'%s.",
1982 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1983 return (file);
1984}
1985
bf9ce431
PA
1986/*
1987 * A helper macro to avoid code duplication
1988 * in send_data() and receive_data().
1989 *
1990 * XXX We have to block SIGURG during putc() because BSD stdio
1991 * is unable to restart interrupted write operations and hence
1992 * the entire buffer contents will be lost as soon as a write()
1993 * call indicates EINTR to stdio.
1994 */
1995#define FTPD_PUTC(ch, file, label) \
1996 do { \
1997 int ret; \
1998 \
1999 do { \
2000 START_UNSAFE; \
2001 ret = putc((ch), (file)); \
2002 END_UNSAFE; \
2003 CHECKOOB(return (-1)) \
2004 else if (ferror(file)) \
2005 goto label; \
2006 clearerr(file); \
2007 } while (ret == EOF); \
2008 } while (0)
2009
984263bc
MD
2010/*
2011 * Tranfer the contents of "instr" to "outstr" peer using the appropriate
2012 * encapsulation of the data subject to Mode, Structure, and Type.
2013 *
2014 * NB: Form isn't handled.
2015 */
2016static int
bf9ce431 2017send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
984263bc 2018{
bf9ce431 2019 int c, cp, filefd, netfd;
984263bc 2020 char *buf;
984263bc 2021
bf9ce431
PA
2022 STARTXFER;
2023
984263bc
MD
2024 switch (type) {
2025
2026 case TYPE_A:
bf9ce431
PA
2027 cp = EOF;
2028 for (;;) {
2029 c = getc(instr);
2030 CHECKOOB(return (-1))
2031 else if (c == EOF && ferror(instr))
2032 goto file_err;
2033 if (c == EOF) {
2034 if (ferror(instr)) { /* resume after OOB */
2035 clearerr(instr);
2036 continue;
2037 }
2038 if (feof(instr)) /* EOF */
2039 break;
2040 syslog(LOG_ERR, "Internal: impossible condition"
2041 " on file after getc()");
2042 goto file_err;
2043 }
2044 if (c == '\n' && cp != '\r') {
2045 FTPD_PUTC('\r', outstr, data_err);
2046 byte_count++;
984263bc 2047 }
bf9ce431
PA
2048 FTPD_PUTC(c, outstr, data_err);
2049 byte_count++;
2050 cp = c;
984263bc 2051 }
bf9ce431
PA
2052#ifdef notyet /* BSD stdio isn't ready for that */
2053 while (fflush(outstr) == EOF) {
2054 CHECKOOB(return (-1))
2055 else
2056 goto data_err;
2057 clearerr(outstr);
2058 }
2059 ENDXFER;
2060#else
2061 ENDXFER;
2062 if (fflush(outstr) == EOF)
984263bc 2063 goto data_err;
bf9ce431 2064#endif
984263bc
MD
2065 reply(226, "Transfer complete.");
2066 return (0);
2067
2068 case TYPE_I:
2069 case TYPE_L:
2070 /*
2071 * isreg is only set if we are not doing restart and we
2072 * are sending a regular file
2073 */
2074 netfd = fileno(outstr);
2075 filefd = fileno(instr);
2076
2077 if (isreg) {
bf9ce431
PA
2078 char *msg = "Transfer complete.";
2079 off_t cnt, offset;
984263bc
MD
2080 int err;
2081
bf9ce431 2082 cnt = offset = 0;
984263bc 2083
bf9ce431 2084 while (filesize > 0) {
984263bc 2085 err = sendfile(filefd, netfd, offset, 0,
bf9ce431 2086 NULL, &cnt, 0);
984263bc
MD
2087 /*
2088 * Calculate byte_count before OOB processing.
2089 * It can be used in myoob() later.
2090 */
2091 byte_count += cnt;
984263bc
MD
2092 offset += cnt;
2093 filesize -= cnt;
bf9ce431
PA
2094 CHECKOOB(return (-1))
2095 else if (err == -1) {
2096 if (errno != EINTR &&
2097 cnt == 0 && offset == 0)
984263bc 2098 goto oldway;
984263bc
MD
2099 goto data_err;
2100 }
bf9ce431
PA
2101 if (err == -1) /* resume after OOB */
2102 continue;
2103 /*
2104 * We hit the EOF prematurely.
2105 * Perhaps the file was externally truncated.
2106 */
2107 if (cnt == 0) {
2108 msg = "Transfer finished due to "
2109 "premature end of file.";
2110 break;
2111 }
984263bc 2112 }
bf9ce431 2113 ENDXFER;
9462167a 2114 reply(226, "%s", msg);
984263bc
MD
2115 return (0);
2116 }
2117
2118oldway:
bf9ce431
PA
2119 if ((buf = malloc(blksize)) == NULL) {
2120 ENDXFER;
2121 reply(451, "Ran out of memory.");
984263bc
MD
2122 return (-1);
2123 }
2124
bf9ce431
PA
2125 for (;;) {
2126 int cnt, len;
2127 char *bp;
2128
2129 cnt = read(filefd, buf, blksize);
2130 CHECKOOB(free(buf); return (-1))
2131 else if (cnt < 0) {
2132 free(buf);
984263bc 2133 goto file_err;
bf9ce431
PA
2134 }
2135 if (cnt < 0) /* resume after OOB */
2136 continue;
2137 if (cnt == 0) /* EOF */
2138 break;
2139 for (len = cnt, bp = buf; len > 0;) {
2140 cnt = write(netfd, bp, len);
2141 CHECKOOB(free(buf); return (-1))
2142 else if (cnt < 0) {
2143 free(buf);
2144 goto data_err;
2145 }
2146 if (cnt <= 0)
2147 continue;
2148 len -= cnt;
2149 bp += cnt;
2150 byte_count += cnt;
2151 }
984263bc 2152 }
bf9ce431
PA
2153 ENDXFER;
2154 free(buf);
984263bc
MD
2155 reply(226, "Transfer complete.");
2156 return (0);
2157 default:
bf9ce431
PA
2158 ENDXFER;
2159 reply(550, "Unimplemented TYPE %d in send_data.", type);
984263bc
MD
2160 return (-1);
2161 }
2162
2163data_err:
bf9ce431 2164 ENDXFER;
984263bc
MD
2165 perror_reply(426, "Data connection");
2166 return (-1);
2167
2168file_err:
bf9ce431 2169 ENDXFER;
984263bc
MD
2170 perror_reply(551, "Error on input file");
2171 return (-1);
984263bc
MD
2172}
2173
2174/*
2175 * Transfer data from peer to "outstr" using the appropriate encapulation of
2176 * the data subject to Mode, Structure, and Type.
2177 *
2178 * N.B.: Form isn't handled.
2179 */
2180static int
bf9ce431 2181receive_data(FILE *instr, FILE *outstr)
984263bc 2182{
bf9ce431
PA
2183 int c, cp;
2184 int bare_lfs = 0;
984263bc 2185
bf9ce431 2186 STARTXFER;
984263bc
MD
2187
2188 switch (type) {
2189
2190 case TYPE_I:
2191 case TYPE_L:
bf9ce431
PA
2192 for (;;) {
2193 int cnt, len;
2194 char *bp;
2195 char buf[BUFSIZ];
2196
2197 cnt = read(fileno(instr), buf, sizeof(buf));
2198 CHECKOOB(return (-1))
2199 else if (cnt < 0)
2200 goto data_err;
2201 if (cnt < 0) /* resume after OOB */
2202 continue;
2203 if (cnt == 0) /* EOF */
2204 break;
2205 for (len = cnt, bp = buf; len > 0;) {
2206 cnt = write(fileno(outstr), bp, len);
2207 CHECKOOB(return (-1))
2208 else if (cnt < 0)
2209 goto file_err;
2210 if (cnt <= 0)
2211 continue;
2212 len -= cnt;
2213 bp += cnt;
2214 byte_count += cnt;
2215 }
984263bc 2216 }
bf9ce431 2217 ENDXFER;
984263bc
MD
2218 return (0);
2219
2220 case TYPE_E:
bf9ce431 2221 ENDXFER;
984263bc 2222 reply(553, "TYPE E not implemented.");
984263bc
MD
2223 return (-1);
2224
2225 case TYPE_A:
bf9ce431
PA
2226 cp = EOF;
2227 for (;;) {
2228 c = getc(instr);
2229 CHECKOOB(return (-1))
2230 else if (c == EOF && ferror(instr))
2231 goto data_err;
2232 if (c == EOF && ferror(instr)) { /* resume after OOB */
2233 clearerr(instr);
2234 continue;
2235 }
2236
2237 if (cp == '\r') {
2238 if (c != '\n')
2239 FTPD_PUTC('\r', outstr, file_err);
2240 } else
2241 if (c == '\n')
2242 bare_lfs++;
2243 if (c == '\r') {
2244 byte_count++;
2245 cp = c;
2246 continue;
984263bc 2247 }
bf9ce431
PA
2248
2249 /* Check for EOF here in order not to lose last \r. */
2250 if (c == EOF) {
2251 if (feof(instr)) /* EOF */
2252 break;
2253 syslog(LOG_ERR, "Internal: impossible condition"
2254 " on data stream after getc()");
2255 goto data_err;
2256 }
2257
2258 byte_count++;
2259 FTPD_PUTC(c, outstr, file_err);
2260 cp = c;
984263bc 2261 }
bf9ce431
PA
2262#ifdef notyet /* BSD stdio isn't ready for that */
2263 while (fflush(outstr) == EOF) {
2264 CHECKOOB(return (-1))
2265 else
2266 goto file_err;
2267 clearerr(outstr);
2268 }
2269 ENDXFER;
2270#else
2271 ENDXFER;
2272 if (fflush(outstr) == EOF)
984263bc 2273 goto file_err;
bf9ce431 2274#endif
984263bc
MD
2275 if (bare_lfs) {
2276 lreply(226,
bf9ce431 2277 "WARNING! %d bare linefeeds received in ASCII mode.",
984263bc 2278 bare_lfs);
bf9ce431 2279 printf(" File may not have transferred correctly.\r\n");
984263bc
MD
2280 }
2281 return (0);
2282 default:
bf9ce431
PA
2283 ENDXFER;
2284 reply(550, "Unimplemented TYPE %d in receive_data.", type);
984263bc
MD
2285 return (-1);
2286 }
2287
2288data_err:
bf9ce431
PA
2289 ENDXFER;
2290 perror_reply(426, "Data connection");
984263bc
MD
2291 return (-1);
2292
2293file_err:
bf9ce431
PA
2294 ENDXFER;
2295 perror_reply(452, "Error writing to file");
984263bc
MD
2296 return (-1);
2297}
2298
2299void
bf9ce431 2300statfilecmd(char *filename)
984263bc
MD
2301{
2302 FILE *fin;
2303 int atstart;
bf9ce431 2304 int c, code;
984263bc 2305 char line[LINE_MAX];
bf9ce431 2306 struct stat st;
984263bc 2307
bf9ce431
PA
2308 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
2309 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
984263bc 2310 fin = ftpd_popen(line, "r");
bf9ce431 2311 lreply(code, "Status of %s:", filename);
984263bc
MD
2312 atstart = 1;
2313 while ((c = getc(fin)) != EOF) {
2314 if (c == '\n') {
2315 if (ferror(stdout)){
bf9ce431
PA
2316 perror_reply(421, "Control connection");
2317 ftpd_pclose(fin);
984263bc
MD
2318 dologout(1);
2319 /* NOTREACHED */
2320 }
2321 if (ferror(fin)) {
2322 perror_reply(551, filename);
bf9ce431 2323 ftpd_pclose(fin);
984263bc
MD
2324 return;
2325 }
bf9ce431 2326 putc('\r', stdout);
984263bc
MD
2327 }
2328 /*
2329 * RFC 959 says neutral text should be prepended before
2330 * a leading 3-digit number followed by whitespace, but
2331 * many ftp clients can be confused by any leading digits,
2332 * as a matter of fact.
2333 */
2334 if (atstart && isdigit(c))
bf9ce431
PA
2335 putc(' ', stdout);
2336 putc(c, stdout);
984263bc
MD
2337 atstart = (c == '\n');
2338 }
bf9ce431
PA
2339 ftpd_pclose(fin);
2340 reply(code, "End of status.");
984263bc
MD
2341}
2342
2343void
bf9ce431 2344statcmd(void)
984263bc
MD
2345{
2346 union sockunion *su;
2347 u_char *a, *p;
2348 char hname[NI_MAXHOST];
2349 int ispassive;
2350
2351 if (hostinfo) {
2352 lreply(211, "%s FTP server status:", hostname);
2353 printf(" %s\r\n", version);
2354 } else
2355 lreply(211, "FTP server status:");
2356 printf(" Connected to %s", remotehost);
2357 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2358 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
bf9ce431 2359 hname[sizeof(hname) - 1] = 0;
984263bc
MD
2360 if (strcmp(hname, remotehost) != 0)
2361 printf(" (%s)", hname);
2362 }
2363 printf("\r\n");
2364 if (logged_in) {
2365 if (guest)
2366 printf(" Logged in anonymously\r\n");
2367 else
2368 printf(" Logged in as %s\r\n", pw->pw_name);
2369 } else if (askpasswd)
2370 printf(" Waiting for password\r\n");
2371 else
2372 printf(" Waiting for user name\r\n");
2373 printf(" TYPE: %s", typenames[type]);
2374 if (type == TYPE_A || type == TYPE_E)
2375 printf(", FORM: %s", formnames[form]);
2376 if (type == TYPE_L)
bf9ce431
PA
2377#if CHAR_BIT == 8
2378 printf(" %d", CHAR_BIT);
984263bc
MD
2379#else
2380 printf(" %d", bytesize); /* need definition! */
2381#endif
2382 printf("; STRUcture: %s; transfer MODE: %s\r\n",
2383 strunames[stru], modenames[mode]);
2384 if (data != -1)
2385 printf(" Data connection open\r\n");
2386 else if (pdata != -1) {
2387 ispassive = 1;
2388 su = &pasv_addr;
2389 goto printaddr;
2390 } else if (usedefault == 0) {
2391 ispassive = 0;
2392 su = &data_dest;
2393printaddr:
2394#define UC(b) (((int) b) & 0xff)
2395 if (epsvall) {
2396 printf(" EPSV only mode (EPSV ALL)\r\n");
2397 goto epsvonly;
2398 }
2399
2400 /* PORT/PASV */
2401 if (su->su_family == AF_INET) {
2402 a = (u_char *) &su->su_sin.sin_addr;
2403 p = (u_char *) &su->su_sin.sin_port;
2404 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n",
2405 ispassive ? "PASV" : "PORT",
2406 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2407 UC(p[0]), UC(p[1]));
2408 }
2409
2410 /* LPRT/LPSV */
2411 {
2412 int alen, af, i;
2413
2414 switch (su->su_family) {
2415 case AF_INET:
2416 a = (u_char *) &su->su_sin.sin_addr;
2417 p = (u_char *) &su->su_sin.sin_port;
2418 alen = sizeof(su->su_sin.sin_addr);
2419 af = 4;
2420 break;
2421 case AF_INET6:
2422 a = (u_char *) &su->su_sin6.sin6_addr;
2423 p = (u_char *) &su->su_sin6.sin6_port;
2424 alen = sizeof(su->su_sin6.sin6_addr);
2425 af = 6;
2426 break;
2427 default:
2428 af = 0;
2429 break;
2430 }
2431 if (af) {
2432 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2433 af, alen);
2434 for (i = 0; i < alen; i++)
2435 printf("%d,", UC(a[i]));
2436 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2437 }
2438 }
2439
2440epsvonly:;
2441 /* EPRT/EPSV */
2442 {
2443 int af;
2444
2445 switch (su->su_family) {
2446 case AF_INET:
2447 af = 1;
2448 break;
2449 case AF_INET6:
2450 af = 2;
2451 break;
2452 default:
2453 af = 0;
2454 break;
2455 }
2456 if (af) {
2457 union sockunion tmp;
2458
2459 tmp = *su;
2460 if (tmp.su_family == AF_INET6)
2461 tmp.su_sin6.sin6_scope_id = 0;
2462 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2463 hname, sizeof(hname) - 1, NULL, 0,
2464 NI_NUMERICHOST)) {
bf9ce431 2465 hname[sizeof(hname) - 1] = 0;
984263bc
MD
2466 printf(" %s |%d|%s|%d|\r\n",
2467 ispassive ? "EPSV" : "EPRT",
2468 af, hname, htons(tmp.su_port));
2469 }
2470 }
2471 }
2472#undef UC
2473 } else
2474 printf(" No data connection\r\n");
bf9ce431 2475 reply(211, "End of status.");
984263bc
MD
2476}
2477
2478void
bf9ce431 2479fatalerror(char *s)
984263bc
MD
2480{
2481
bf9ce431 2482 reply(451, "Error in server: %s", s);
984263bc
MD
2483 reply(221, "Closing connection due to server error.");
2484 dologout(0);
2485 /* NOTREACHED */
2486}
2487
2488void
984263bc 2489reply(int n, const char *fmt, ...)
984263bc
MD
2490{
2491 va_list ap;
bf9ce431
PA
2492
2493 printf("%d ", n);
984263bc 2494 va_start(ap, fmt);
bf9ce431
PA
2495 vprintf(fmt, ap);
2496 va_end(ap);
2497 printf("\r\n");
2498 fflush(stdout);
984263bc
MD
2499 if (ftpdebug) {
2500 syslog(LOG_DEBUG, "<--- %d ", n);
bf9ce431 2501 va_start(ap, fmt);
984263bc 2502 vsyslog(LOG_DEBUG, fmt, ap);
bf9ce431 2503 va_end(ap);
984263bc
MD
2504 }
2505}
2506
2507void
984263bc 2508lreply(int n, const char *fmt, ...)
984263bc
MD
2509{
2510 va_list ap;
bf9ce431
PA
2511
2512 printf("%d- ", n);
984263bc 2513 va_start(ap, fmt);
bf9ce431
PA
2514 vprintf(fmt, ap);
2515 va_end(ap);
2516 printf("\r\n");
2517 fflush(stdout);
984263bc
MD
2518 if (ftpdebug) {
2519 syslog(LOG_DEBUG, "<--- %d- ", n);
bf9ce431 2520 va_start(ap, fmt);
984263bc 2521 vsyslog(LOG_DEBUG, fmt, ap);
bf9ce431 2522 va_end(ap);
984263bc
MD
2523 }
2524}
2525
2526static void
bf9ce431 2527ack(char *s)
984263bc
MD
2528{
2529
2530 reply(250, "%s command successful.", s);
2531}
2532
2533void
bf9ce431 2534nack(char *s)
984263bc
MD
2535{
2536
2537 reply(502, "%s command not implemented.", s);
2538}
2539
2540/* ARGSUSED */
2541void
bf9ce431 2542yyerror(char *s)
984263bc
MD
2543{
2544 char *cp;
2545
2546 if ((cp = strchr(cbuf,'\n')))
2547 *cp = '\0';
bf9ce431 2548 reply(500, "%s: command not understood.", cbuf);
984263bc
MD
2549}
2550
2551void
bf9ce431 2552delete(char *name)
984263bc
MD
2553{
2554 struct stat st;
2555
2556 LOGCMD("delete", name);
2557 if (lstat(name, &st) < 0) {
2558 perror_reply(550, name);
2559 return;
2560 }
bf9ce431 2561 if (S_ISDIR(st.st_mode)) {
984263bc
MD
2562 if (rmdir(name) < 0) {
2563 perror_reply(550, name);
2564 return;
2565 }
2566 goto done;
2567 }
bf9ce431
PA
2568 if (guest && noguestmod) {
2569 reply(550, "Operation not permitted.");
2570 return;
2571 }
984263bc
MD
2572 if (unlink(name) < 0) {
2573 perror_reply(550, name);
2574 return;
2575 }
2576done:
2577 ack("DELE");
2578}
2579
2580void
bf9ce431 2581cwd(char *path)
984263bc
MD
2582{
2583
2584 if (chdir(path) < 0)
2585 perror_reply(550, path);
2586 else
2587 ack("CWD");
2588}
2589
2590void
bf9ce431 2591makedir(char *name)
984263bc
MD
2592{
2593 char *s;
2594
2595 LOGCMD("mkdir", name);
2596 if (guest && noguestmkd)
bf9ce431 2597 reply(550, "Operation not permitted.");
984263bc
MD
2598 else if (mkdir(name, 0777) < 0)
2599 perror_reply(550, name);
2600 else {
2601 if ((s = doublequote(name)) == NULL)
2602 fatalerror("Ran out of memory.");
2603 reply(257, "\"%s\" directory created.", s);
2604 free(s);
2605 }
2606}
2607
2608void
bf9ce431 2609removedir(char *name)
984263bc
MD
2610{
2611
2612 LOGCMD("rmdir", name);
2613 if (rmdir(name) < 0)
2614 perror_reply(550, name);
2615 else
2616 ack("RMD");
2617}
2618
2619void
bf9ce431 2620pwd(void)
984263bc
MD
2621{
2622 char *s, path[MAXPATHLEN + 1];
2623
bf9ce431
PA
2624 if (getcwd(path, sizeof(path)) == NULL)
2625 perror_reply(550, "Get current directory");
984263bc
MD
2626 else {
2627 if ((s = doublequote(path)) == NULL)
2628 fatalerror("Ran out of memory.");
2629 reply(257, "\"%s\" is current directory.", s);
2630 free(s);
2631 }
2632}
2633
2634char *
bf9ce431 2635renamefrom(char *name)
984263bc
MD
2636{
2637 struct stat st;
2638
bf9ce431
PA
2639 if (guest && noguestmod) {
2640 reply(550, "Operation not permitted.");
2641 return (NULL);
2642 }
984263bc
MD
2643 if (lstat(name, &st) < 0) {
2644 perror_reply(550, name);
bf9ce431 2645 return (NULL);
984263bc 2646 }
bf9ce431 2647 reply(350, "File exists, ready for destination name.");
984263bc
MD
2648 return (name);
2649}
2650
2651void
bf9ce431 2652renamecmd(char *from, char *to)
984263bc
MD
2653{
2654 struct stat st;
2655
2656 LOGCMD2("rename", from, to);
2657
2658 if (guest && (stat(to, &st) == 0)) {
bf9ce431 2659 reply(550, "%s: permission denied.", to);
984263bc
MD
2660 return;
2661 }
2662
2663 if (rename(from, to) < 0)
2664 perror_reply(550, "rename");
2665 else
2666 ack("RNTO");
2667}
2668
2669static void
bf9ce431 2670dolog(struct sockaddr *who)
984263bc 2671{
bf9ce431 2672 char who_name[NI_MAXHOST];
984263bc
MD
2673
2674 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
bf9ce431
PA
2675 remotehost[sizeof(remotehost) - 1] = 0;
2676 if (getnameinfo(who, who->sa_len,
2677 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
2678 *who_name = 0;
2679 who_name[sizeof(who_name) - 1] = 0;
984263bc
MD
2680
2681#ifdef SETPROCTITLE
2682#ifdef VIRTUAL_HOSTING
2683 if (thishost != firsthost)
2684 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2685 remotehost, hostname);
2686 else
2687#endif
2688 snprintf(proctitle, sizeof(proctitle), "%s: connected",
2689 remotehost);
2690 setproctitle("%s", proctitle);
2691#endif /* SETPROCTITLE */
2692
2693 if (logging) {
2694#ifdef VIRTUAL_HOSTING
2695 if (thishost != firsthost)
bf9ce431
PA
2696 syslog(LOG_INFO, "connection from %s (%s) to %s",
2697 remotehost, who_name, hostname);
984263bc
MD
2698 else
2699#endif
bf9ce431
PA
2700 syslog(LOG_INFO, "connection from %s (%s)",
2701 remotehost, who_name);
984263bc
MD
2702 }
2703}
2704
2705/*
2706 * Record logout in wtmp file
2707 * and exit with supplied status.
2708 */
2709void
bf9ce431 2710dologout(int status)
984263bc 2711{
984263bc
MD
2712
2713 if (logged_in && dowtmp) {
bf9ce431 2714 seteuid(0);
984263bc
MD
2715 ftpd_logwtmp(ttyline, "", NULL);
2716 }
2717 /* beware of flushing buffers after a SIGPIPE */
2718 _exit(status);
2719}
2720
2721static void
bf9ce431 2722sigurg(int signo)
984263bc
MD
2723{
2724
2725 recvurg = 1;
2726}
2727
2728static void
bf9ce431 2729maskurg(int flag)
984263bc 2730{
bf9ce431
PA
2731 int oerrno;
2732 sigset_t sset;
984263bc 2733
bf9ce431
PA
2734 if (!transflag) {
2735 syslog(LOG_ERR, "Internal: maskurg() while no transfer");
984263bc 2736 return;
bf9ce431
PA
2737 }
2738 oerrno = errno;
2739 sigemptyset(&sset);
2740 sigaddset(&sset, SIGURG);
2741 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
2742 errno = oerrno;
2743}
2744
2745static void
2746flagxfer(int flag)
2747{
2748
2749 if (flag) {
2750 if (transflag)
2751 syslog(LOG_ERR, "Internal: flagxfer(1): "
2752 "transfer already under way");
2753 transflag = 1;
2754 maskurg(0);
2755 recvurg = 0;
2756 } else {
2757 if (!transflag)
2758 syslog(LOG_ERR, "Internal: flagxfer(0): "
2759 "no active transfer");
2760 maskurg(1);
2761 transflag = 0;
2762 }
2763}
2764
2765/*
2766 * Returns 0 if OK to resume or -1 if abort requested.
2767 */
2768static int
2769myoob(void)
2770{
2771 char *cp;
2772 int ret;
2773
2774 if (!transflag) {
2775 syslog(LOG_ERR, "Internal: myoob() while no transfer");
2776 return (0);
2777 }
984263bc 2778 cp = tmpline;
cae2835b 2779 ret = get_line(cp, 7, stdin);
bf9ce431 2780 if (ret == -1) {
984263bc
MD
2781 reply(221, "You could at least say goodbye.");
2782 dologout(0);
bf9ce431
PA
2783 } else if (ret == -2) {
2784 /* Ignore truncated command. */
2785 return (0);
984263bc
MD
2786 }
2787 upper(cp);
2788 if (strcmp(cp, "ABOR\r\n") == 0) {
2789 tmpline[0] = '\0';
2790 reply(426, "Transfer aborted. Data connection closed.");
bf9ce431
PA
2791 reply(226, "Abort successful.");
2792 return (-1);
984263bc
MD
2793 }
2794 if (strcmp(cp, "STAT\r\n") == 0) {
2795 tmpline[0] = '\0';
bf9ce431
PA
2796 if (file_size != -1)
2797 reply(213, "Status: %jd of %jd bytes transferred.",
2798 (intmax_t)byte_count, (intmax_t)file_size);
984263bc 2799 else
bf9ce431
PA
2800 reply(213, "Status: %jd bytes transferred.",
2801 (intmax_t)byte_count);
984263bc 2802 }
bf9ce431 2803 return (0);
984263bc
MD
2804}
2805
2806/*
2807 * Note: a response of 425 is not mentioned as a possible response to
2808 * the PASV command in RFC959. However, it has been blessed as
2809 * a legitimate response by Jon Postel in a telephone conversation
2810 * with Rick Adams on 25 Jan 89.
2811 */
2812void
bf9ce431 2813passive(void)
984263bc 2814{
bf9ce431
PA
2815 socklen_t len;
2816 int on;
984263bc
MD
2817 char *p, *a;
2818
2819 if (pdata >= 0) /* close old port if one set */
2820 close(pdata);
2821
2822 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2823 if (pdata < 0) {
2824 perror_reply(425, "Can't open passive connection");
2825 return;
2826 }
2827 on = 1;
2828 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2829 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2830
bf9ce431 2831 seteuid(0);
984263bc
MD
2832
2833#ifdef IP_PORTRANGE
2834 if (ctrl_addr.su_family == AF_INET) {
2835 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2836 : IP_PORTRANGE_DEFAULT;
2837
2838 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2839 &on, sizeof(on)) < 0)
2840 goto pasv_error;
2841 }
2842#endif
2843#ifdef IPV6_PORTRANGE
2844 if (ctrl_addr.su_family == AF_INET6) {
2845 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2846 : IPV6_PORTRANGE_DEFAULT;
2847
2848 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2849 &on, sizeof(on)) < 0)
2850 goto pasv_error;
2851 }
2852#endif
2853
2854 pasv_addr = ctrl_addr;
2855 pasv_addr.su_port = 0;
2856 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2857 goto pasv_error;
2858
bf9ce431 2859 seteuid(pw->pw_uid);
984263bc
MD
2860
2861 len = sizeof(pasv_addr);
2862 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2863 goto pasv_error;
2864 if (listen(pdata, 1) < 0)
2865 goto pasv_error;
2866 if (pasv_addr.su_family == AF_INET)
2867 a = (char *) &pasv_addr.su_sin.sin_addr;
2868 else if (pasv_addr.su_family == AF_INET6 &&
2869 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2870 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2871 else
2872 goto pasv_error;
2873
2874 p = (char *) &pasv_addr.su_port;
2875
2876#define UC(b) (((int) b) & 0xff)
2877
2878 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2879 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2880 return;
2881
2882pasv_error:
bf9ce431
PA
2883 seteuid(pw->pw_uid);
2884 close(pdata);
984263bc
MD
2885 pdata = -1;
2886 perror_reply(425, "Can't open passive connection");
2887 return;
2888}
2889
2890/*
2891 * Long Passive defined in RFC 1639.
2892 * 228 Entering Long Passive Mode
2893 * (af, hal, h1, h2, h3,..., pal, p1, p2...)
2894 */
2895
2896void
bf9ce431 2897long_passive(char *cmd, int pf)
984263bc 2898{
bf9ce431
PA
2899 socklen_t len;
2900 int on;
984263bc
MD
2901 char *p, *a;
2902
2903 if (pdata >= 0) /* close old port if one set */
2904 close(pdata);
2905
2906 if (pf != PF_UNSPEC) {
2907 if (ctrl_addr.su_family != pf) {
2908 switch (ctrl_addr.su_family) {
2909 case AF_INET:
2910 pf = 1;
2911 break;
2912 case AF_INET6:
2913 pf = 2;
2914 break;
2915 default:
2916 pf = 0;
2917 break;
2918 }
2919 /*
2920 * XXX
2921 * only EPRT/EPSV ready clients will understand this
2922 */
2923 if (strcmp(cmd, "EPSV") == 0 && pf) {
2924 reply(522, "Network protocol mismatch, "
2925 "use (%d)", pf);
2926 } else
bf9ce431 2927 reply(501, "Network protocol mismatch."); /*XXX*/
984263bc
MD
2928
2929 return;
2930 }
2931 }
2932
2933 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2934 if (pdata < 0) {
2935 perror_reply(425, "Can't open passive connection");
2936 return;
2937 }
2938 on = 1;
2939 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2940 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2941
bf9ce431 2942 seteuid(0);
984263bc
MD
2943
2944 pasv_addr = ctrl_addr;
2945 pasv_addr.su_port = 0;
2946 len = pasv_addr.su_len;
2947
2948#ifdef IP_PORTRANGE
2949 if (ctrl_addr.su_family == AF_INET) {
2950 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2951 : IP_PORTRANGE_DEFAULT;
2952
2953 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2954 &on, sizeof(on)) < 0)
2955 goto pasv_error;
2956 }
2957#endif
2958#ifdef IPV6_PORTRANGE
2959 if (ctrl_addr.su_family == AF_INET6) {
2960 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2961 : IPV6_PORTRANGE_DEFAULT;
2962
2963 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2964 &on, sizeof(on)) < 0)
2965 goto pasv_error;
2966 }
2967#endif
2968
2969 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
2970 goto pasv_error;
2971
bf9ce431 2972 seteuid(pw->pw_uid);
984263bc
MD
2973
2974 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2975 goto pasv_error;
2976 if (listen(pdata, 1) < 0)
2977 goto pasv_error;
2978
2979#define UC(b) (((int) b) & 0xff)
2980
2981 if (strcmp(cmd, "LPSV") == 0) {
2982 p = (char *)&pasv_addr.su_port;
2983 switch (pasv_addr.su_family) {
2984 case AF_INET:
2985 a = (char *) &pasv_addr.su_sin.sin_addr;
2986 v4_reply:
2987 reply(228,
2988"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2989 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2990 2, UC(p[0]), UC(p[1]));
2991 return;
2992 case AF_INET6:
2993 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
2994 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2995 goto v4_reply;
2996 }
2997 a = (char *) &pasv_addr.su_sin6.sin6_addr;
2998 reply(228,
2999"Entering Long Passive Mode "
3000"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
3001 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
3002 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
3003 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
3004 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
3005 2, UC(p[0]), UC(p[1]));
3006 return;
3007 }
3008 } else if (strcmp(cmd, "EPSV") == 0) {
3009 switch (pasv_addr.su_family) {
3010 case AF_INET:
3011 case AF_INET6:
3012 reply(229, "Entering Extended Passive Mode (|||%d|)",
3013 ntohs(pasv_addr.su_port));
3014 return;
3015 }
3016 } else {
3017 /* more proper error code? */
3018 }
3019
3020pasv_error:
bf9ce431
PA
3021 seteuid(pw->pw_uid);
3022 close(pdata);
984263bc
MD
3023 pdata = -1;
3024 perror_reply(425, "Can't open passive connection");
3025 return;
3026}
3027
3028/*
3029 * Generate unique name for file with basename "local"
3030 * and open the file in order to avoid possible races.
3031 * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
3032 * Return descriptor to the file, set "name" to its name.
3033 *
3034 * Generates failure reply on error.
3035 */
3036static int
bf9ce431 3037guniquefd(char *local, char **name)
984263bc
MD
3038{
3039 static char new[MAXPATHLEN];
3040 struct stat st;
3041 char *cp;
3042 int count;
3043 int fd;
3044
3045 cp = strrchr(local, '/');
3046 if (cp)
3047 *cp = '\0';
3048 if (stat(cp ? local : ".", &st) < 0) {
3049 perror_reply(553, cp ? local : ".");
3050 return (-1);
3051 }
3052 if (cp) {
3053 /*
3054 * Let not overwrite dirname with counter suffix.
3055 * -4 is for /nn\0
3056 * In this extreme case dot won't be put in front of suffix.
3057 */
3058 if (strlen(local) > sizeof(new) - 4) {
bf9ce431 3059 reply(553, "Pathname too long.");
984263bc
MD
3060 return (-1);
3061 }
3062 *cp = '/';
3063 }
3064 /* -4 is for the .nn<null> we put on the end below */
bf9ce431 3065 snprintf(new, sizeof(new) - 4, "%s", local);
984263bc
MD
3066 cp = new + strlen(new);
3067 /*
3068 * Don't generate dotfile unless requested explicitly.
3069 * This covers the case when basename gets truncated off
3070 * by buffer size.
3071 */
3072 if (cp > new && cp[-1] != '/')
3073 *cp++ = '.';
3074 for (count = 0; count < 100; count++) {
3075 /* At count 0 try unmodified name */
3076 if (count)
bf9ce431 3077 sprintf(cp, "%d", count);
984263bc
MD
3078 if ((fd = open(count ? new : local,
3079 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
3080 *name = count ? new : local;
3081 return (fd);
3082 }
3083 if (errno != EEXIST) {
3084 perror_reply(553, count ? new : local);
3085 return (-1);
3086 }
3087 }
3088 reply(452, "Unique file name cannot be created.");
3089 return (-1);
3090}
3091
3092/*
3093 * Format and send reply containing system error number.
3094 */
3095void
bf9ce431 3096perror_reply(int code, char *string)
984263bc
MD
3097{
3098
3099 reply(code, "%s: %s.", string, strerror(errno));
3100}
3101
3102static char *onefile[] = {
3103 "",
3104 0
3105};
3106
3107void
bf9ce431 3108send_file_list(char *whichf)
984263bc
MD
3109{
3110 struct stat st;
3111 DIR *dirp = NULL;
3112 struct dirent *dir;
3113 FILE *dout = NULL;
3114 char **dirlist, *dirname;
3115 int simple = 0;
3116 int freeglob = 0;
3117 glob_t gl;
3118
3119 if (strpbrk(whichf, "~{[*?") != NULL) {
bf9ce431 3120 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
984263bc
MD
3121
3122 memset(&gl, 0, sizeof(gl));
3123 gl.gl_matchc = MAXGLOBARGS;
e1809290 3124 /*flags |= GLOB_LIMIT;*/
984263bc
MD
3125 freeglob = 1;
3126 if (glob(whichf, flags, 0, &gl)) {
bf9ce431 3127 reply(550, "No matching files found.");
984263bc
MD
3128 goto out;
3129 } else if (gl.gl_pathc == 0) {
3130 errno = ENOENT;
3131 perror_reply(550, whichf);
3132 goto out;
3133 }
3134 dirlist = gl.gl_pathv;
3135 } else {
3136 onefile[0] = whichf;
3137 dirlist = onefile;
3138 simple = 1;
3139 }
3140
3141 while ((dirname = *dirlist++)) {
3142 if (stat(dirname, &st) < 0) {
3143 /*
3144 * If user typed "ls -l", etc, and the client
3145 * used NLST, do what the user meant.
3146 */
3147 if (dirname[0] == '-' && *dirlist == NULL &&
bf9ce431 3148 dout == NULL)
984263bc 3149 retrieve(_PATH_LS " %s", dirname);
bf9ce431
PA
3150 else
3151 perror_reply(550, whichf);
984263bc
MD
3152 goto out;
3153 }
3154
3155 if (S_ISREG(st.st_mode)) {
3156 if (dout == NULL) {
bf9ce431 3157 dout = dataconn("file list", -1, "w");
984263bc
MD
3158 if (dout == NULL)
3159 goto out;
bf9ce431 3160 STARTXFER;
984263bc 3161 }
bf9ce431 3162 START_UNSAFE;
984263bc
MD
3163 fprintf(dout, "%s%s\n", dirname,
3164 type == TYPE_A ? "\r" : "");
bf9ce431
PA
3165 END_UNSAFE;
3166 if (ferror(dout))
3167 goto data_err;
3168 byte_count += strlen(dirname) +
3169 (type == TYPE_A ? 2 : 1);
3170 CHECKOOB(goto abrt);
984263bc
MD
3171 continue;
3172 } else if (!S_ISDIR(st.st_mode))
3173 continue;
3174
3175 if ((dirp = opendir(dirname)) == NULL)
3176 continue;
3177
3178 while ((dir = readdir(dirp)) != NULL) {
3179 char nbuf[MAXPATHLEN];
3180
bf9ce431 3181 CHECKOOB(goto abrt);
984263bc 3182
3c36c955 3183 if (strcmp(dir->d_name, ".") == 0)
984263bc 3184 continue;
3c36c955 3185 if (strcmp(dir->d_name, "..") == 0)
984263bc
MD
3186 continue;
3187
bf9ce431 3188 snprintf(nbuf, sizeof(nbuf),
984263bc
MD
3189 "%s/%s", dirname, dir->d_name);
3190
3191 /*
3192 * We have to do a stat to insure it's
3193 * not a directory or special file.
3194 */
3195 if (simple || (stat(nbuf, &st) == 0 &&
3196 S_ISREG(st.st_mode))) {
3197 if (dout == NULL) {
bf9ce431 3198 dout = dataconn("file list", -1, "w");
984263bc
MD
3199 if (dout == NULL)
3200 goto out;
bf9ce431 3201 STARTXFER;
984263bc 3202 }
bf9ce431 3203 START_UNSAFE;
984263bc
MD
3204 if (nbuf[0] == '.' && nbuf[1] == '/')
3205 fprintf(dout, "%s%s\n", &nbuf[2],
3206 type == TYPE_A ? "\r" : "");
3207 else
3208 fprintf(dout, "%s%s\n", nbuf,
3209 type == TYPE_A ? "\r" : "");
bf9ce431
PA
3210 END_UNSAFE;
3211 if (ferror(dout))
3212 goto data_err;
3213 byte_count += strlen(nbuf) +
3214 (type == TYPE_A ? 2 : 1);
3215 CHECKOOB(goto abrt);
984263bc
MD
3216 }
3217 }
bf9ce431
PA
3218 closedir(dirp);
3219 dirp = NULL;
984263bc
MD
3220 }
3221
3222 if (dout == NULL)
3223 reply(550, "No files found.");
bf9ce431
PA
3224 else if (ferror(dout))
3225data_err: perror_reply(550, "Data connection");
984263bc
MD
3226 else
3227 reply(226, "Transfer complete.");
984263bc 3228out:
bf9ce431
PA
3229 if (dout) {
3230 ENDXFER;
3231abrt:
3232 fclose(dout);
3233 data = -1;
3234 pdata = -1;
3235 }
3236 if (dirp)
3237 closedir(dirp);
984263bc
MD
3238 if (freeglob) {
3239 freeglob = 0;
3240 globfree(&gl);
3241 }
3242}
3243
3244void
bf9ce431 3245reapchild(int signo)
984263bc 3246{
bf9ce431 3247 while (waitpid(-1, NULL, WNOHANG) > 0);
984263bc
MD
3248}
3249
984263bc 3250static void
bf9ce431 3251appendf(char **strp, char *fmt, ...)
984263bc 3252{
bf9ce431
PA
3253 va_list ap;
3254 char *ostr, *p;
3255
3256 va_start(ap, fmt);
3257 vasprintf(&p, fmt, ap);
3258 va_end(ap);
3259 if (p == NULL)
3260 fatalerror("Ran out of memory.");
3261 if (*strp == NULL)
3262 *strp = p;
3263 else {
3264 ostr = *strp;
3265 asprintf(strp, "%s%s", ostr, p);
3266 if (*strp == NULL)
3267 fatalerror("Ran out of memory.");
3268 free(ostr);
3269 }
3270}
3271
3272static void
3273logcmd(char *cmd, char *file1, char *file2, off_t cnt)
3274{
3275 char *msg = NULL;
3276 char wd[MAXPATHLEN + 1];
3277
3278 if (logging <= 1)
3279 return;
3280
3281 if (getcwd(wd, sizeof(wd) - 1) == NULL)
3282 strcpy(wd, strerror(errno));
3283
3284 appendf(&msg, "%s", cmd);
3285 if (file1)
3286 appendf(&msg, " %s", file1);
3287 if (file2)
3288 appendf(&msg, " %s", file2);
3289 if (cnt >= 0)
3290 appendf(&msg, " = %jd bytes", (intmax_t)cnt);
3291 appendf(&msg, " (wd: %s", wd);
3292 if (guest || dochroot)
3293 appendf(&msg, "; chrooted");
3294 appendf(&msg, ")");
3295 syslog(LOG_INFO, "%s", msg);
3296 free(msg);
3297}
3298
3299static void
3300logxfer(char *name, off_t size, time_t start)
3301{
3302 char buf[MAXPATHLEN + 1024];
984263bc
MD
3303 char path[MAXPATHLEN + 1];
3304 time_t now;
3305
bf9ce431 3306 if (statfd >= 0) {
984263bc 3307 time(&now);
bf9ce431
PA
3308 if (realpath(name, path) == NULL) {
3309 syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
3310 return;
3311 }
3312 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
984263bc 3313 ctime(&now)+4, ident, remotehost,
bf9ce431 3314 path, (intmax_t)size,
984263bc
MD
3315 (long)(now - start + (now == start)));
3316 write(statfd, buf, strlen(buf));
3317 }
3318}
3319
3320static char *
bf9ce431 3321doublequote(char *s)
984263bc
MD
3322{
3323 int n;
3324 char *p, *s2;
3325
3326 for (p = s, n = 0; *p; p++)
3327 if (*p == '"')
3328 n++;
3329
3330 if ((s2 = malloc(p - s + n + 1)) == NULL)
3331 return (NULL);
3332
3333 for (p = s2; *s; s++, p++) {
3334 if ((*p = *s) == '"')
3335 *(++p) = '"';
3336 }
3337 *p = '\0';
3338
3339 return (s2);
3340}
bf9ce431
PA
3341
3342/* setup server socket for specified address family */
3343/* if af is PF_UNSPEC more than one socket may be returned */
3344/* the returned list is dynamically allocated, so caller needs to free it */
3345static int *
3346socksetup(int af, char *bindname, const char *bindport)
3347{
3348 struct addrinfo hints, *res, *r;
3349 int error, maxs, *s, *socks;
3350 const int on = 1;
3351
3352 memset(&hints, 0, sizeof(hints));
3353 hints.ai_flags = AI_PASSIVE;
3354 hints.ai_family = af;
3355 hints.ai_socktype = SOCK_STREAM;
3356 error = getaddrinfo(bindname, bindport, &hints, &res);
3357 if (error) {
3358 syslog(LOG_ERR, "%s", gai_strerror(error));
3359 if (error == EAI_SYSTEM)
3360 syslog(LOG_ERR, "%s", strerror(errno));
3361 return NULL;
3362 }
3363
3364 /* Count max number of sockets we may open */
3365 for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
3366 ;
3367 socks = malloc((maxs + 1) * sizeof(int));
3368 if (!socks) {
3369 freeaddrinfo(res);
3370 syslog(LOG_ERR, "couldn't allocate memory for sockets");
3371 return NULL;
3372 }
3373
3374 *socks = 0; /* num of sockets counter at start of array */
3375 s = socks + 1;
3376 for (r = res; r; r = r->ai_next) {
3377 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
3378 if (*s < 0) {
3379 syslog(LOG_DEBUG, "control socket: %m");
3380 continue;
3381 }
3382 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
3383 &on, sizeof(on)) < 0)
3384 syslog(LOG_WARNING,
3385 "control setsockopt (SO_REUSEADDR): %m");
3386 if (r->ai_family == AF_INET6) {
3387 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
3388 &on, sizeof(on)) < 0)
3389 syslog(LOG_WARNING,
3390 "control setsockopt (IPV6_V6ONLY): %m");
3391 }
3392 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
3393 syslog(LOG_DEBUG, "control bind: %m");
3394 close(*s);
3395 continue;
3396 }
3397 (*socks)++;
3398 s++;
3399 }
3400
3401 if (res)
3402 freeaddrinfo(res);
3403
3404 if (*socks == 0) {
3405 syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
3406 free(socks);
3407 return NULL;
3408 }
3409 return(socks);
3410}