Merge from vendor branch GROFF:
[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.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
1de703da
MD
32 *
33 * @(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94
984263bc
MD
35 */
36
37#if 0
984263bc
MD
38static const char rcsid[] =
39 "$FreeBSD: src/libexec/ftpd/ftpd.c,v 1.62.2.48 2003/02/14 12:42:42 yar Exp $";
3c36c955 40 "$DragonFly: src/libexec/ftpd/ftpd.c,v 1.6 2005/08/08 16:17:04 joerg Exp $";
984263bc
MD
41#endif /* not lint */
42
43/*
44 * FTP server.
45 */
46#include <sys/param.h>
47#include <sys/ioctl.h>
48#include <sys/mman.h>
49#include <sys/socket.h>
50#include <sys/stat.h>
51#include <sys/time.h>
52#include <sys/wait.h>
53
54#include <netinet/in.h>
55#include <netinet/in_systm.h>
56#include <netinet/ip.h>
57#include <netinet/tcp.h>
58
59#define FTP_NAMES
60#include <arpa/ftp.h>
61#include <arpa/inet.h>
62#include <arpa/telnet.h>
63
64#include <ctype.h>
65#include <dirent.h>
66#include <err.h>
67#include <errno.h>
68#include <fcntl.h>
69#include <glob.h>
70#include <limits.h>
71#include <netdb.h>
72#include <pwd.h>
73#include <grp.h>
74#include <signal.h>
75#include <stdio.h>
76#include <stdlib.h>
77#include <string.h>
78#include <syslog.h>
79#include <time.h>
80#include <unistd.h>
81#include <libutil.h>
82#ifdef LOGIN_CAP
83#include <login_cap.h>
84#endif
85
86#ifdef SKEY
87#include <skey.h>
88#endif
89
90#if !defined(NOPAM)
91#include <security/pam_appl.h>
92#endif
93
94#include "pathnames.h"
95#include "extern.h"
96
97#if __STDC__
98#include <stdarg.h>
99#else
100#include <varargs.h>
101#endif
102
103static char version[] = "Version 6.00LS";
104#undef main
105
106extern off_t restart_point;
107extern char cbuf[];
108
109union sockunion server_addr;
110union sockunion ctrl_addr;
111union sockunion data_source;
112union sockunion data_dest;
113union sockunion his_addr;
114union sockunion pasv_addr;
115
116int daemon_mode;
117int data;
118int dataport;
119int hostinfo = 1; /* print host-specific info in messages */
120int logged_in;
121struct passwd *pw;
122char *homedir;
123int ftpdebug;
124int timeout = 900; /* timeout after 15 minutes of inactivity */
125int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
126int logging;
127int restricted_data_ports = 1;
128int paranoid = 1; /* be extra careful about security */
129int anon_only = 0; /* Only anonymous ftp allowed */
130int guest;
131int dochroot;
132int dowtmp = 1;
133int stats;
134int statfd = -1;
135int type;
136int form;
137int stru; /* avoid C keyword */
138int mode;
139int usedefault = 1; /* for data transfers */
140int pdata = -1; /* for passive mode */
141int readonly=0; /* Server is in readonly mode. */
142int noepsv=0; /* EPSV command is disabled. */
143int noretr=0; /* RETR command is disabled. */
144int noguestretr=0; /* RETR command is disabled for anon users. */
145int noguestmkd=0; /* MKD command is disabled for anon users. */
146int noguestmod=1; /* anon users may not modify existing files. */
147
148static volatile sig_atomic_t recvurg;
149sig_atomic_t transflag;
150off_t file_size;
151off_t byte_count;
152#if !defined(CMASK) || CMASK == 0
153#undef CMASK
154#define CMASK 027
155#endif
156int defumask = CMASK; /* default umask value */
157char tmpline[7];
158char *hostname;
159int epsvall = 0;
160
161#ifdef VIRTUAL_HOSTING
162char *ftpuser;
163
164static struct ftphost {
165 struct ftphost *next;
166 struct addrinfo *hostinfo;
167 char *hostname;
168 char *anonuser;
169 char *statfile;
170 char *welcome;
171 char *loginmsg;
172} *thishost, *firsthost;
173
174#endif
175char remotehost[MAXHOSTNAMELEN];
176char *ident = NULL;
177
178static char ttyline[20];
179char *tty = ttyline; /* for klogin */
180
181#if !defined(NOPAM)
3eefb696 182static int auth_pam (struct passwd**, const char*);
984263bc
MD
183#endif
184
185char *pid_file = NULL;
186
187/*
188 * Limit number of pathnames that glob can return.
189 * A limit of 0 indicates the number of pathnames is unlimited.
190 */
191#define MAXGLOBARGS 16384
192#
193
194/*
195 * Timeout intervals for retrying connections
196 * to hosts that don't accept PORT cmds. This
197 * is a kludge, but given the problems with TCP...
198 */
199#define SWAITMAX 90 /* wait at most 90 seconds */
200#define SWAITINT 5 /* interval between retries */
201
202int swaitmax = SWAITMAX;
203int swaitint = SWAITINT;
204
205#ifdef SETPROCTITLE
206#ifdef OLD_SETPROCTITLE
207char **Argv = NULL; /* pointer to argument vector */
208char *LastArgv = NULL; /* end of argv */
209#endif /* OLD_SETPROCTITLE */
210char proctitle[LINE_MAX]; /* initial part of title */
211#endif /* SETPROCTITLE */
212
213#ifdef SKEY
214int pwok = 0;
215#endif
216
217#define LOGCMD(cmd, file) \
218 if (logging > 1) \
219 syslog(LOG_INFO,"%s %s%s", cmd, \
220 *(file) == '/' ? "" : curdir(), file);
221#define LOGCMD2(cmd, file1, file2) \
222 if (logging > 1) \
223 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
224 *(file1) == '/' ? "" : curdir(), file1, \
225 *(file2) == '/' ? "" : curdir(), file2);
226#define LOGBYTES(cmd, file, cnt) \
227 if (logging > 1) { \
228 if (cnt == (off_t)-1) \
229 syslog(LOG_INFO,"%s %s%s", cmd, \
230 *(file) == '/' ? "" : curdir(), file); \
231 else \
232 syslog(LOG_INFO, "%s %s%s = %qd bytes", \
233 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \
234 }
235
236#ifdef VIRTUAL_HOSTING
3eefb696
MD
237static void inithosts (void);
238static void selecthost (union sockunion *);
984263bc 239#endif
3eefb696
MD
240static void ack (char *);
241static void sigurg (int);
242static void myoob (void);
243static int checkuser (char *, char *, int, char **);
244static FILE *dataconn (char *, off_t, char *);
245static void dolog (struct sockaddr *);
246static char *curdir (void);
247static void end_login (void);
248static FILE *getdatasock (char *);
249static int guniquefd (char *, char **);
250static void lostconn (int);
251static void sigquit (int);
252static int receive_data (FILE *, FILE *);
253static int send_data (FILE *, FILE *, off_t, off_t, int);
984263bc 254static struct passwd *
3eefb696
MD
255 sgetpwnam (char *);
256static char *sgetsave (char *);
257static void reapchild (int);
258static void logxfer (char *, off_t, time_t);
259static char *doublequote (char *);
984263bc
MD
260
261static char *
262curdir()
263{
264 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */
265
266 if (getcwd(path, sizeof(path)-2) == NULL)
267 return ("");
268 if (path[1] != '\0') /* special case for root dir. */
269 strcat(path, "/");
270 /* For guest account, skip / since it's chrooted */
271 return (guest ? path+1 : path);
272}
273
274int
275main(argc, argv, envp)
276 int argc;
277 char *argv[];
278 char **envp;
279{
280 int addrlen, ch, on = 1, tos;
281 char *cp, line[LINE_MAX];
282 FILE *fd;
283 int error;
284 char *bindname = NULL;
285 const char *bindport = "ftp";
286 int family = AF_UNSPEC;
287 int enable_v4 = 0;
288 struct sigaction sa;
289
290 tzset(); /* in case no timezone database in ~ftp */
291 sigemptyset(&sa.sa_mask);
292 sa.sa_flags = SA_RESTART;
293
294#ifdef OLD_SETPROCTITLE
295 /*
296 * Save start and extent of argv for setproctitle.
297 */
298 Argv = argv;
299 while (*envp)
300 envp++;
301 LastArgv = envp[-1] + strlen(envp[-1]);
302#endif /* OLD_SETPROCTITLE */
303
304
305 while ((ch = getopt(argc, argv,
306 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) {
307 switch (ch) {
308 case '4':
309 enable_v4 = 1;
310 if (family == AF_UNSPEC)
311 family = AF_INET;
312 break;
313
314 case '6':
315 family = AF_INET6;
316 break;
317
318 case 'a':
319 bindname = optarg;
320 break;
321
322 case 'A':
323 anon_only = 1;
324 break;
325
326 case 'd':
327 ftpdebug++;
328 break;
329
330 case 'D':
331 daemon_mode++;
332 break;
333
334 case 'E':
335 noepsv = 1;
336 break;
337
338 case 'h':
339 hostinfo = 0;
340 break;
341
342 case 'l':
343 logging++; /* > 1 == extra logging */
344 break;
345
346 case 'm':
347 noguestmod = 0;
348 break;
349
350 case 'M':
351 noguestmkd = 1;
352 break;
353
354 case 'o':
355 noretr = 1;
356 break;
357
358 case 'O':
359 noguestretr = 1;
360 break;
361
362 case 'p':
363 pid_file = optarg;
364 break;
365
366 case 'P':
367 bindport = optarg;
368 break;
369
370 case 'r':
371 readonly = 1;
372 break;
373
374 case 'R':
375 paranoid = 0;
376 break;
377
378 case 'S':
379 stats++;
380 break;
381
382 case 't':
383 timeout = atoi(optarg);
384 if (maxtimeout < timeout)
385 maxtimeout = timeout;
386 break;
387
388 case 'T':
389 maxtimeout = atoi(optarg);
390 if (timeout > maxtimeout)
391 timeout = maxtimeout;
392 break;
393
394 case 'u':
395 {
396 long val = 0;
397
398 val = strtol(optarg, &optarg, 8);
399 if (*optarg != '\0' || val < 0)
400 warnx("bad value for -u");
401 else
402 defumask = val;
403 break;
404 }
405 case 'U':
406 restricted_data_ports = 0;
407 break;
408
409 case 'v':
410 ftpdebug++;
411 break;
412
413 case 'W':
414 dowtmp = 0;
415 break;
416
417 default:
418 warnx("unknown flag -%c ignored", optopt);
419 break;
420 }
421 }
422
423#ifdef VIRTUAL_HOSTING
424 inithosts();
425#endif
426 (void) freopen(_PATH_DEVNULL, "w", stderr);
427
428 /*
429 * LOG_NDELAY sets up the logging connection immediately,
430 * necessary for anonymous ftp's that chroot and can't do it later.
431 */
432 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
433
434 if (daemon_mode) {
435 int ctl_sock, fd;
436 struct addrinfo hints, *res;
437
438 /*
439 * Detach from parent.
440 */
441 if (daemon(1, 1) < 0) {
442 syslog(LOG_ERR, "failed to become a daemon");
443 exit(1);
444 }
445 sa.sa_handler = reapchild;
446 (void)sigaction(SIGCHLD, &sa, NULL);
447 /* init bind_sa */
448 memset(&hints, 0, sizeof(hints));
449
450 hints.ai_family = family == AF_UNSPEC ? AF_INET : family;
451 hints.ai_socktype = SOCK_STREAM;
452 hints.ai_protocol = 0;
453 hints.ai_flags = AI_PASSIVE;
454 error = getaddrinfo(bindname, bindport, &hints, &res);
455 if (error) {
456 if (family == AF_UNSPEC) {
457 hints.ai_family = AF_UNSPEC;
458 error = getaddrinfo(bindname, bindport, &hints,
459 &res);
460 }
461 }
462 if (error) {
463 syslog(LOG_ERR, "%s", gai_strerror(error));
464 if (error == EAI_SYSTEM)
465 syslog(LOG_ERR, "%s", strerror(errno));
466 exit(1);
467 }
468 if (res->ai_addr == NULL) {
469 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
470 exit(1);
471 } else
472 family = res->ai_addr->sa_family;
473 /*
474 * Open a socket, bind it to the FTP port, and start
475 * listening.
476 */
477 ctl_sock = socket(family, SOCK_STREAM, 0);
478 if (ctl_sock < 0) {
479 syslog(LOG_ERR, "control socket: %m");
480 exit(1);
481 }
482 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR,
483 &on, sizeof(on)) < 0)
484 syslog(LOG_WARNING,
485 "control setsockopt (SO_REUSEADDR): %m");
486 if (family == AF_INET6 && enable_v4 == 0) {
487 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY,
488 &on, sizeof (on)) < 0)
489 syslog(LOG_WARNING,
490 "control setsockopt (IPV6_V6ONLY): %m");
491 }
492 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len);
493 if (bind(ctl_sock, (struct sockaddr *)&server_addr,
494 server_addr.su_len) < 0) {
495 syslog(LOG_ERR, "control bind: %m");
496 exit(1);
497 }
498 if (listen(ctl_sock, 32) < 0) {
499 syslog(LOG_ERR, "control listen: %m");
500 exit(1);
501 }
502 /*
503 * Atomically write process ID
504 */
505 if (pid_file)
506 {
507 int fd;
508 char buf[20];
509
510 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC
511 | O_NONBLOCK | O_EXLOCK, 0644);
512 if (fd < 0) {
513 if (errno == EAGAIN)
514 errx(1, "%s: file locked", pid_file);
515 else
516 err(1, "%s", pid_file);
517 }
518 snprintf(buf, sizeof(buf),
519 "%lu\n", (unsigned long) getpid());
520 if (write(fd, buf, strlen(buf)) < 0)
521 err(1, "%s: write", pid_file);
522 /* Leave the pid file open and locked */
523 }
524 /*
525 * Loop forever accepting connection requests and forking off
526 * children to handle them.
527 */
528 while (1) {
529 addrlen = server_addr.su_len;
530 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen);
d8b3dd1c
MD
531
532 if (fd >= 0) {
533 if (fork() == 0) {
534 /* child */
535 (void) dup2(fd, 0);
536 (void) dup2(fd, 1);
537 close(ctl_sock);
538 break;
539 }
540 close(fd);
984263bc 541 }
984263bc
MD
542 }
543 } else {
544 addrlen = sizeof(his_addr);
545 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
546 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
547 exit(1);
548 }
549 }
550
551 sa.sa_handler = SIG_DFL;
552 (void)sigaction(SIGCHLD, &sa, NULL);
553
554 sa.sa_handler = sigurg;
555 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
556 (void)sigaction(SIGURG, &sa, NULL);
557
558 sigfillset(&sa.sa_mask); /* block all signals in handler */
559 sa.sa_flags = SA_RESTART;
560 sa.sa_handler = sigquit;
561 (void)sigaction(SIGHUP, &sa, NULL);
562 (void)sigaction(SIGINT, &sa, NULL);
563 (void)sigaction(SIGQUIT, &sa, NULL);
564 (void)sigaction(SIGTERM, &sa, NULL);
565
566 sa.sa_handler = lostconn;
567 (void)sigaction(SIGPIPE, &sa, NULL);
568
569 addrlen = sizeof(ctrl_addr);
570 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
571 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
572 exit(1);
573 }
574 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
575#ifdef VIRTUAL_HOSTING
576 /* select our identity from virtual host table */
577 selecthost(&ctrl_addr);
578#endif
579#ifdef IP_TOS
580 if (ctrl_addr.su_family == AF_INET)
581 {
582 tos = IPTOS_LOWDELAY;
583 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
584 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
585 }
586#endif
587 /*
588 * Disable Nagle on the control channel so that we don't have to wait
589 * for peer's ACK before issuing our next reply.
590 */
591 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
592 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
593
594 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
595
596 /* set this here so klogin can use it... */
597 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
598
599 /* Try to handle urgent data inline */
600#ifdef SO_OOBINLINE
601 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
602 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
603#endif
604
605#ifdef F_SETOWN
606 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
607 syslog(LOG_ERR, "fcntl F_SETOWN: %m");
608#endif
609 dolog((struct sockaddr *)&his_addr);
610 /*
611 * Set up default state
612 */
613 data = -1;
614 type = TYPE_A;
615 form = FORM_N;
616 stru = STRU_F;
617 mode = MODE_S;
618 tmpline[0] = '\0';
619
620 /* If logins are disabled, print out the message. */
621 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
622 while (fgets(line, sizeof(line), fd) != NULL) {
623 if ((cp = strchr(line, '\n')) != NULL)
624 *cp = '\0';
625 lreply(530, "%s", line);
626 }
627 (void) fflush(stdout);
628 (void) fclose(fd);
629 reply(530, "System not available.");
630 exit(0);
631 }
632#ifdef VIRTUAL_HOSTING
633 if ((fd = fopen(thishost->welcome, "r")) != NULL) {
634#else
635 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
636#endif
637 while (fgets(line, sizeof(line), fd) != NULL) {
638 if ((cp = strchr(line, '\n')) != NULL)
639 *cp = '\0';
640 lreply(220, "%s", line);
641 }
642 (void) fflush(stdout);
643 (void) fclose(fd);
644 /* reply(220,) must follow */
645 }
646#ifndef VIRTUAL_HOSTING
647 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
648 fatalerror("Ran out of memory.");
649 (void) gethostname(hostname, MAXHOSTNAMELEN - 1);
650 hostname[MAXHOSTNAMELEN - 1] = '\0';
651#endif
652 if (hostinfo)
653 reply(220, "%s FTP server (%s) ready.", hostname, version);
654 else
655 reply(220, "FTP server ready.");
656 for (;;)
657 (void) yyparse();
658 /* NOTREACHED */
659}
660
661static void
662lostconn(signo)
663 int signo;
664{
665
666 if (ftpdebug)
667 syslog(LOG_DEBUG, "lost connection");
668 dologout(1);
669}
670
671static void
672sigquit(signo)
673 int signo;
674{
675
676 syslog(LOG_ERR, "got signal %d", signo);
677 dologout(1);
678}
679
680#ifdef VIRTUAL_HOSTING
681/*
682 * read in virtual host tables (if they exist)
683 */
684
685static void
686inithosts()
687{
688 int insert;
689 size_t len;
690 FILE *fp;
691 char *cp, *mp, *line;
692 char *hostname;
693 char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
694 struct ftphost *hrp, *lhrp;
695 struct addrinfo hints, *res, *ai;
696
697 /*
698 * Fill in the default host information
699 */
700 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
701 fatalerror("Ran out of memory.");
702 if (gethostname(hostname, MAXHOSTNAMELEN) < 0)
703 hostname[0] = '\0';
704 hostname[MAXHOSTNAMELEN - 1] = '\0';
705 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
706 fatalerror("Ran out of memory.");
707 hrp->hostname = hostname;
708 hrp->hostinfo = NULL;
709
710 memset(&hints, 0, sizeof(hints));
711 hints.ai_flags = AI_CANONNAME;
712 hints.ai_family = AF_UNSPEC;
713 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
714 hrp->hostinfo = res;
715 hrp->statfile = _PATH_FTPDSTATFILE;
716 hrp->welcome = _PATH_FTPWELCOME;
717 hrp->loginmsg = _PATH_FTPLOGINMESG;
718 hrp->anonuser = "ftp";
719 hrp->next = NULL;
720 thishost = firsthost = lhrp = hrp;
721 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
722 int addrsize, gothost;
723 void *addr;
724 struct hostent *hp;
725
726 while ((line = fgetln(fp, &len)) != NULL) {
727 int i, hp_error;
728
729 /* skip comments */
730 if (line[0] == '#')
731 continue;
732 if (line[len - 1] == '\n') {
733 line[len - 1] = '\0';
734 mp = NULL;
735 } else {
736 if ((mp = malloc(len + 1)) == NULL)
737 fatalerror("Ran out of memory.");
738 memcpy(mp, line, len);
739 mp[len] = '\0';
740 line = mp;
741 }
742 cp = strtok(line, " \t");
743 /* skip empty lines */
744 if (cp == NULL)
745 goto nextline;
746 vhost = cp;
747
748 /* set defaults */
749 anonuser = "ftp";
750 statfile = _PATH_FTPDSTATFILE;
751 welcome = _PATH_FTPWELCOME;
752 loginmsg = _PATH_FTPLOGINMESG;
753
754 /*
755 * Preparse the line so we can use its info
756 * for all the addresses associated with
757 * the virtual host name.
758 * Field 0, the virtual host name, is special:
759 * it's already parsed off and will be strdup'ed
760 * later, after we know its canonical form.
761 */
762 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
763 if (*cp != '-' && (cp = strdup(cp)))
764 switch (i) {
765 case 1: /* anon user permissions */
766 anonuser = cp;
767 break;
768 case 2: /* statistics file */
769 statfile = cp;
770 break;
771 case 3: /* welcome message */
772 welcome = cp;
773 break;
774 case 4: /* login message */
775 loginmsg = cp;
776 break;
777 default: /* programming error */
778 abort();
779 /* NOTREACHED */
780 }
781
782 hints.ai_flags = 0;
783 hints.ai_family = AF_UNSPEC;
784 hints.ai_flags = AI_PASSIVE;
785 if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
786 goto nextline;
787 for (ai = res; ai != NULL && ai->ai_addr != NULL;
788 ai = ai->ai_next) {
789
790 gothost = 0;
791 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
792 struct addrinfo *hi;
793
794 for (hi = hrp->hostinfo; hi != NULL;
795 hi = hi->ai_next)
796 if (hi->ai_addrlen == ai->ai_addrlen &&
797 memcmp(hi->ai_addr,
798 ai->ai_addr,
799 ai->ai_addr->sa_len) == 0) {
800 gothost++;
801 break;
802 }
803 if (gothost)
804 break;
805 }
806 if (hrp == NULL) {
807 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
808 goto nextline;
809 hrp->hostname = NULL;
810 insert = 1;
811 } else {
812 if (hrp->hostinfo && hrp->hostinfo != res)
813 freeaddrinfo(hrp->hostinfo);
814 insert = 0; /* host already in the chain */
815 }
816 hrp->hostinfo = res;
817
818 /*
819 * determine hostname to use.
820 * force defined name if there is a valid alias
821 * otherwise fallback to primary hostname
822 */
823 /* XXX: getaddrinfo() can't do alias check */
824 switch(hrp->hostinfo->ai_family) {
825 case AF_INET:
826 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
827 addrsize = sizeof(struct in_addr);
828 break;
829 case AF_INET6:
830 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
831 addrsize = sizeof(struct in6_addr);
832 break;
833 default:
834 /* should not reach here */
835 freeaddrinfo(hrp->hostinfo);
836 if (insert)
837 free(hrp); /*not in chain, can free*/
838 else
839 hrp->hostinfo = NULL; /*mark as blank*/
840 goto nextline;
841 /* NOTREACHED */
842 }
843 if ((hp = getipnodebyaddr(addr, addrsize,
844 hrp->hostinfo->ai_family,
845 &hp_error)) != NULL) {
846 if (strcmp(vhost, hp->h_name) != 0) {
847 if (hp->h_aliases == NULL)
848 vhost = hp->h_name;
849 else {
850 i = 0;
851 while (hp->h_aliases[i] &&
852 strcmp(vhost, hp->h_aliases[i]) != 0)
853 ++i;
854 if (hp->h_aliases[i] == NULL)
855 vhost = hp->h_name;
856 }
857 }
858 }
859 if (hrp->hostname &&
860 strcmp(hrp->hostname, vhost) != 0) {
861 free(hrp->hostname);
862 hrp->hostname = NULL;
863 }
864 if (hrp->hostname == NULL &&
865 (hrp->hostname = strdup(vhost)) == NULL) {
866 freeaddrinfo(hrp->hostinfo);
867 hrp->hostinfo = NULL; /* mark as blank */
868 if (hp)
869 freehostent(hp);
870 goto nextline;
871 }
872 hrp->anonuser = anonuser;
873 hrp->statfile = statfile;
874 hrp->welcome = welcome;
875 hrp->loginmsg = loginmsg;
876 if (insert) {
877 hrp->next = NULL;
878 lhrp->next = hrp;
879 lhrp = hrp;
880 }
881 if (hp)
882 freehostent(hp);
883 }
884nextline:
885 if (mp)
886 free(mp);
887 }
888 (void) fclose(fp);
889 }
890}
891
892static void
893selecthost(su)
894 union sockunion *su;
895{
896 struct ftphost *hrp;
897 u_int16_t port;
898#ifdef INET6
899 struct in6_addr *mapped_in6 = NULL;
900#endif
901 struct addrinfo *hi;
902
903#ifdef INET6
904 /*
905 * XXX IPv4 mapped IPv6 addr consideraton,
906 * specified in rfc2373.
907 */
908 if (su->su_family == AF_INET6 &&
909 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
910 mapped_in6 = &su->su_sin6.sin6_addr;
911#endif
912
913 hrp = thishost = firsthost; /* default */
914 port = su->su_port;
915 su->su_port = 0;
916 while (hrp != NULL) {
917 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
918 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
919 thishost = hrp;
920 break;
921 }
922#ifdef INET6
923 /* XXX IPv4 mapped IPv6 addr consideraton */
924 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
925 (memcmp(&mapped_in6->s6_addr[12],
926 &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
927 sizeof(struct in_addr)) == 0)) {
928 thishost = hrp;
929 break;
930 }
931#endif
932 }
933 hrp = hrp->next;
934 }
935 su->su_port = port;
936 /* setup static variables as appropriate */
937 hostname = thishost->hostname;
938 ftpuser = thishost->anonuser;
939}
940#endif
941
942/*
943 * Helper function for sgetpwnam().
944 */
945static char *
946sgetsave(s)
947 char *s;
948{
949 char *new = malloc((unsigned) strlen(s) + 1);
950
951 if (new == NULL) {
952 perror_reply(421, "Local resource failure: malloc");
953 dologout(1);
954 /* NOTREACHED */
955 }
956 (void) strcpy(new, s);
957 return (new);
958}
959
960/*
961 * Save the result of a getpwnam. Used for USER command, since
962 * the data returned must not be clobbered by any other command
963 * (e.g., globbing).
964 */
965static struct passwd *
966sgetpwnam(name)
967 char *name;
968{
969 static struct passwd save;
970 struct passwd *p;
971
972 if ((p = getpwnam(name)) == NULL)
973 return (p);
974 if (save.pw_name) {
975 free(save.pw_name);
976 free(save.pw_passwd);
977 free(save.pw_gecos);
978 free(save.pw_dir);
979 free(save.pw_shell);
980 }
981 save = *p;
982 save.pw_name = sgetsave(p->pw_name);
983 save.pw_passwd = sgetsave(p->pw_passwd);
984 save.pw_gecos = sgetsave(p->pw_gecos);
985 save.pw_dir = sgetsave(p->pw_dir);
986 save.pw_shell = sgetsave(p->pw_shell);
987 return (&save);
988}
989
990static int login_attempts; /* number of failed login attempts */
991static int askpasswd; /* had user command, ask for passwd */
992static char curname[MAXLOGNAME]; /* current USER name */
993
994/*
995 * USER command.
996 * Sets global passwd pointer pw if named account exists and is acceptable;
997 * sets askpasswd if a PASS command is expected. If logged in previously,
998 * need to reset state. If name is "ftp" or "anonymous", the name is not in
999 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
1000 * If account doesn't exist, ask for passwd anyway. Otherwise, check user
1001 * requesting login privileges. Disallow anyone who does not have a standard
1002 * shell as returned by getusershell(). Disallow anyone mentioned in the file
1003 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
1004 */
1005void
1006user(name)
1007 char *name;
1008{
1009 char *cp, *shell;
1010
1011 if (logged_in) {
1012 if (guest) {
1013 reply(530, "Can't change user from guest login.");
1014 return;
1015 } else if (dochroot) {
1016 reply(530, "Can't change user from chroot user.");
1017 return;
1018 }
1019 end_login();
1020 }
1021
1022 guest = 0;
1023 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
1024 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
1025 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
1026 reply(530, "User %s access denied.", name);
1027#ifdef VIRTUAL_HOSTING
1028 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) {
1029#else
1030 else if ((pw = sgetpwnam("ftp")) != NULL) {
1031#endif
1032 guest = 1;
1033 askpasswd = 1;
1034 reply(331,
1035 "Guest login ok, send your email address as password.");
1036 } else
1037 reply(530, "User %s unknown.", name);
1038 if (!askpasswd && logging)
1039 syslog(LOG_NOTICE,
1040 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1041 return;
1042 }
1043 if (anon_only != 0) {
1044 reply(530, "Sorry, only anonymous ftp allowed.");
1045 return;
1046 }
1047
1048 if ((pw = sgetpwnam(name))) {
1049 if ((shell = pw->pw_shell) == NULL || *shell == 0)
1050 shell = _PATH_BSHELL;
1051 while ((cp = getusershell()) != NULL)
1052 if (strcmp(cp, shell) == 0)
1053 break;
1054 endusershell();
1055
1056 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
1057 reply(530, "User %s access denied.", name);
1058 if (logging)
1059 syslog(LOG_NOTICE,
1060 "FTP LOGIN REFUSED FROM %s, %s",
1061 remotehost, name);
1062 pw = (struct passwd *) NULL;
1063 return;
1064 }
1065 }
1066 if (logging)
1067 strncpy(curname, name, sizeof(curname)-1);
1068#ifdef SKEY
1069 pwok = skeyaccess(name, NULL, remotehost, remotehost);
1070 reply(331, "%s", skey_challenge(name, pw, pwok));
1071#else
1072 reply(331, "Password required for %s.", name);
1073#endif
1074 askpasswd = 1;
1075 /*
1076 * Delay before reading passwd after first failed
1077 * attempt to slow down passwd-guessing programs.
1078 */
1079 if (login_attempts)
1080 sleep((unsigned) login_attempts);
1081}
1082
1083/*
1084 * Check if a user is in the file "fname",
1085 * return a pointer to a malloc'd string with the rest
1086 * of the matching line in "residue" if not NULL.
1087 */
1088static int
1089checkuser(fname, name, pwset, residue)
1090 char *fname;
1091 char *name;
1092 int pwset;
1093 char **residue;
1094{
1095 FILE *fd;
1096 int found = 0;
1097 size_t len;
1098 char *line, *mp, *p;
1099
1100 if ((fd = fopen(fname, "r")) != NULL) {
1101 while (!found && (line = fgetln(fd, &len)) != NULL) {
1102 /* skip comments */
1103 if (line[0] == '#')
1104 continue;
1105 if (line[len - 1] == '\n') {
1106 line[len - 1] = '\0';
1107 mp = NULL;
1108 } else {
1109 if ((mp = malloc(len + 1)) == NULL)
1110 fatalerror("Ran out of memory.");
1111 memcpy(mp, line, len);
1112 mp[len] = '\0';
1113 line = mp;
1114 }
1115 /* avoid possible leading and trailing whitespace */
1116 p = strtok(line, " \t");
1117 /* skip empty lines */
1118 if (p == NULL)
1119 goto nextline;
1120 /*
1121 * if first chr is '@', check group membership
1122 */
1123 if (p[0] == '@') {
1124 int i = 0;
1125 struct group *grp;
1126
1127 if (p[1] == '\0') /* single @ matches anyone */
1128 found = 1;
1129 else {
1130 if ((grp = getgrnam(p+1)) == NULL)
1131 goto nextline;
1132 /*
1133 * Check user's default group
1134 */
1135 if (pwset && grp->gr_gid == pw->pw_gid)
1136 found = 1;
1137 /*
1138 * Check supplementary groups
1139 */
1140 while (!found && grp->gr_mem[i])
1141 found = strcmp(name,
1142 grp->gr_mem[i++])
1143 == 0;
1144 }
1145 }
1146 /*
1147 * Otherwise, just check for username match
1148 */
1149 else
1150 found = strcmp(p, name) == 0;
1151 /*
1152 * Save the rest of line to "residue" if matched
1153 */
1154 if (found && residue) {
1155 if ((p = strtok(NULL, "")) != NULL)
1156 p += strspn(p, " \t");
1157 if (p && *p) {
1158 if ((*residue = strdup(p)) == NULL)
1159 fatalerror("Ran out of memory.");
1160 } else
1161 *residue = NULL;
1162 }
1163nextline:
1164 if (mp)
1165 free(mp);
1166 }
1167 (void) fclose(fd);
1168 }
1169 return (found);
1170}
1171
1172/*
1173 * Terminate login as previous user, if any, resetting state;
1174 * used when USER command is given or login fails.
1175 */
1176static void
1177end_login()
1178{
1179
1180 (void) seteuid((uid_t)0);
1181 if (logged_in && dowtmp)
1182 ftpd_logwtmp(ttyline, "", NULL);
1183 pw = NULL;
1184#ifdef LOGIN_CAP
1185 setusercontext(NULL, getpwuid(0), (uid_t)0,
1186 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1187#endif
1188 logged_in = 0;
1189 guest = 0;
1190 dochroot = 0;
1191}
1192
1193#if !defined(NOPAM)
1194
1195/*
1196 * the following code is stolen from imap-uw PAM authentication module and
1197 * login.c
1198 */
1199#define COPY_STRING(s) (s ? strdup(s) : NULL)
1200
1201struct cred_t {
1202 const char *uname; /* user name */
1203 const char *pass; /* password */
1204};
1205typedef struct cred_t cred_t;
1206
1207static int
1208auth_conv(int num_msg, const struct pam_message **msg,
1209 struct pam_response **resp, void *appdata)
1210{
1211 int i;
1212 cred_t *cred = (cred_t *) appdata;
1213 struct pam_response *reply =
1214 malloc(sizeof(struct pam_response) * num_msg);
1215
1216 for (i = 0; i < num_msg; i++) {
1217 switch (msg[i]->msg_style) {
1218 case PAM_PROMPT_ECHO_ON: /* assume want user name */
1219 reply[i].resp_retcode = PAM_SUCCESS;
1220 reply[i].resp = COPY_STRING(cred->uname);
1221 /* PAM frees resp. */
1222 break;
1223 case PAM_PROMPT_ECHO_OFF: /* assume want password */
1224 reply[i].resp_retcode = PAM_SUCCESS;
1225 reply[i].resp = COPY_STRING(cred->pass);
1226 /* PAM frees resp. */
1227 break;
1228 case PAM_TEXT_INFO:
1229 case PAM_ERROR_MSG:
1230 reply[i].resp_retcode = PAM_SUCCESS;
1231 reply[i].resp = NULL;
1232 break;
1233 default: /* unknown message style */
1234 free(reply);
1235 return PAM_CONV_ERR;
1236 }
1237 }
1238
1239 *resp = reply;
1240 return PAM_SUCCESS;
1241}
1242
1243/*
1244 * Attempt to authenticate the user using PAM. Returns 0 if the user is
1245 * authenticated, or 1 if not authenticated. If some sort of PAM system
1246 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1247 * function returns -1. This can be used as an indication that we should
1248 * fall back to a different authentication mechanism.
1249 */
1250static int
1251auth_pam(struct passwd **ppw, const char *pass)
1252{
1253 pam_handle_t *pamh = NULL;
1254 const char *tmpl_user;
1255 const void *item;
1256 int rval;
1257 int e;
1258 cred_t auth_cred = { (*ppw)->pw_name, pass };
1259 struct pam_conv conv = { &auth_conv, &auth_cred };
1260
1261 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1262 if (e != PAM_SUCCESS) {
1263 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e));
1264 return -1;
1265 }
1266
1267 e = pam_set_item(pamh, PAM_RHOST, remotehost);
1268 if (e != PAM_SUCCESS) {
1269 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1270 pam_strerror(pamh, e));
1271 return -1;
1272 }
1273
1274 e = pam_authenticate(pamh, 0);
1275 switch (e) {
1276 case PAM_SUCCESS:
1277 /*
1278 * With PAM we support the concept of a "template"
1279 * user. The user enters a login name which is
1280 * authenticated by PAM, usually via a remote service
1281 * such as RADIUS or TACACS+. If authentication
1282 * succeeds, a different but related "template" name
1283 * is used for setting the credentials, shell, and
1284 * home directory. The name the user enters need only
1285 * exist on the remote authentication server, but the
1286 * template name must be present in the local password
1287 * database.
1288 *
1289 * This is supported by two various mechanisms in the
1290 * individual modules. However, from the application's
1291 * point of view, the template user is always passed
1292 * back as a changed value of the PAM_USER item.
1293 */
1294 if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1295 PAM_SUCCESS) {
1296 tmpl_user = (const char *) item;
1297 if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1298 *ppw = getpwnam(tmpl_user);
1299 } else
1300 syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1301 pam_strerror(pamh, e));
1302 rval = 0;
1303 break;
1304
1305 case PAM_AUTH_ERR:
1306 case PAM_USER_UNKNOWN:
1307 case PAM_MAXTRIES:
1308 rval = 1;
1309 break;
1310
1311 default:
1312 syslog(LOG_ERR, "auth_pam: %s", pam_strerror(pamh, e));
1313 rval = -1;
1314 break;
1315 }
1316
1317 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1318 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1319 rval = -1;
1320 }
1321 return rval;
1322}
1323
1324#endif /* !defined(NOPAM) */
1325
1326void
1327pass(passwd)
1328 char *passwd;
1329{
1330 int rval;
1331 FILE *fd;
1332#ifdef LOGIN_CAP
1333 login_cap_t *lc = NULL;
1334#endif
1335 char *chrootdir;
1336 char *residue = NULL;
1337
1338 if (logged_in || askpasswd == 0) {
1339 reply(503, "Login with USER first.");
1340 return;
1341 }
1342 askpasswd = 0;
1343 if (!guest) { /* "ftp" is only account allowed no password */
1344 if (pw == NULL) {
1345 rval = 1; /* failure below */
1346 goto skip;
1347 }
1348#if !defined(NOPAM)
1349 rval = auth_pam(&pw, passwd);
1350 if (rval >= 0)
1351 goto skip;
1352#endif
1353#ifdef SKEY
1354 if (pwok)
1355 rval = strcmp(pw->pw_passwd,
1356 crypt(passwd, pw->pw_passwd));
1357 if (rval)
1358 rval = strcmp(pw->pw_passwd,
1359 skey_crypt(passwd, pw->pw_passwd, pw, pwok));
1360#else
1361 rval = strcmp(pw->pw_passwd, crypt(passwd, pw->pw_passwd));
1362#endif
1363 /* The strcmp does not catch null passwords! */
1364 if (*pw->pw_passwd == '\0' ||
1365 (pw->pw_expire && time(NULL) >= pw->pw_expire))
1366 rval = 1; /* failure */
1367skip:
1368 /*
1369 * If rval == 1, the user failed the authentication check
1370 * above. If rval == 0, either PAM or local authentication
1371 * succeeded.
1372 */
1373 if (rval) {
1374 reply(530, "Login incorrect.");
1375 if (logging) {
1376 syslog(LOG_NOTICE,
1377 "FTP LOGIN FAILED FROM %s",
1378 remotehost);
1379 syslog(LOG_AUTHPRIV | LOG_NOTICE,
1380 "FTP LOGIN FAILED FROM %s, %s",
1381 remotehost, curname);
1382 }
1383 pw = NULL;
1384 if (login_attempts++ >= 5) {
1385 syslog(LOG_NOTICE,
1386 "repeated login failures from %s",
1387 remotehost);
1388 exit(0);
1389 }
1390 return;
1391 }
1392 }
1393#ifdef SKEY
1394 pwok = 0;
1395#endif
1396 login_attempts = 0; /* this time successful */
1397 if (setegid((gid_t)pw->pw_gid) < 0) {
1398 reply(550, "Can't set gid.");
1399 return;
1400 }
1401 /* May be overridden by login.conf */
1402 (void) umask(defumask);
1403#ifdef LOGIN_CAP
1404 if ((lc = login_getpwclass(pw)) != NULL) {
1405 char remote_ip[MAXHOSTNAMELEN];
1406
1407 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
1408 remote_ip, sizeof(remote_ip) - 1, NULL, 0,
1409 NI_NUMERICHOST);
1410 remote_ip[sizeof(remote_ip) - 1] = 0;
1411 if (!auth_hostok(lc, remotehost, remote_ip)) {
1412 syslog(LOG_INFO|LOG_AUTH,
1413 "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1414 pw->pw_name);
1415 reply(530, "Permission denied.\n");
1416 pw = NULL;
1417 return;
1418 }
1419 if (!auth_timeok(lc, time(NULL))) {
1420 reply(530, "Login not available right now.\n");
1421 pw = NULL;
1422 return;
1423 }
1424 }
1425 setusercontext(lc, pw, (uid_t)0,
1426 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1427 LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1428#else
1429 setlogin(pw->pw_name);
1430 (void) initgroups(pw->pw_name, pw->pw_gid);
1431#endif
1432
1433 /* open wtmp before chroot */
1434 if (dowtmp)
1435 ftpd_logwtmp(ttyline, pw->pw_name,
1436 (struct sockaddr *)&his_addr);
1437 logged_in = 1;
1438
1439 if (guest && stats && statfd < 0)
1440#ifdef VIRTUAL_HOSTING
1441 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0)
1442#else
1443 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0)
1444#endif
1445 stats = 0;
1446
1447 dochroot =
1448 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
1449#ifdef LOGIN_CAP /* Allow login.conf configuration as well */
1450 || login_getcapbool(lc, "ftp-chroot", 0)
1451#endif
1452 ;
1453 chrootdir = NULL;
1454 /*
1455 * For a chrooted local user,
1456 * a) see whether ftpchroot(5) specifies a chroot directory,
1457 * b) extract the directory pathname from the line,
1458 * c) expand it to the absolute pathname if necessary.
1459 */
1460 if (dochroot && residue &&
1461 (chrootdir = strtok(residue, " \t")) != NULL &&
1462 chrootdir[0] != '/') {
1463 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1464 if (chrootdir == NULL)
1465 fatalerror("Ran out of memory.");
1466 }
1467 if (guest || dochroot) {
1468 /*
1469 * If no chroot directory set yet, use the login directory.
1470 * Copy it so it can be modified while pw->pw_dir stays intact.
1471 */
1472 if (chrootdir == NULL &&
1473 (chrootdir = strdup(pw->pw_dir)) == NULL)
1474 fatalerror("Ran out of memory.");
1475 /*
1476 * Check for the "/chroot/./home" syntax,
1477 * separate the chroot and home directory pathnames.
1478 */
1479 if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1480 *(homedir++) = '\0'; /* wipe '/' */
1481 homedir++; /* skip '.' */
1482 /* so chrootdir can be freed later */
1483 if ((homedir = strdup(homedir)) == NULL)
1484 fatalerror("Ran out of memory.");
1485 } else {
1486 /*
1487 * We MUST do a chdir() after the chroot. Otherwise
1488 * the old current directory will be accessible as "."
1489 * outside the new root!
1490 */
1491 homedir = "/";
1492 }
1493 /*
1494 * Finally, do chroot()
1495 */
1496 if (chroot(chrootdir) < 0) {
1497 reply(550, "Can't change root.");
1498 goto bad;
1499 }
1500 } else /* real user w/o chroot */
1501 homedir = pw->pw_dir;
1502 /*
1503 * Set euid *before* doing chdir() so
1504 * a) the user won't be carried to a directory that he couldn't reach
1505 * on his own due to no permission to upper path components,
1506 * b) NFS mounted homedirs w/restrictive permissions will be accessible
1507 * (uid 0 has no root power over NFS if not mapped explicitly.)
1508 */
1509 if (seteuid((uid_t)pw->pw_uid) < 0) {
1510 reply(550, "Can't set uid.");
1511 goto bad;
1512 }
1513 if (chdir(homedir) < 0) {
1514 if (guest || dochroot) {
1515 reply(550, "Can't change to base directory.");
1516 goto bad;
1517 } else {
1518 if (chdir("/") < 0) {
1519 reply(550, "Root is inaccessible.");
1520 goto bad;
1521 }
1522 lreply(230, "No directory! Logging in with home=/");
1523 }
1524 }
1525
1526 /*
1527 * Display a login message, if it exists.
1528 * N.B. reply(230,) must follow the message.
1529 */
1530#ifdef VIRTUAL_HOSTING
1531 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) {
1532#else
1533 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
1534#endif
1535 char *cp, line[LINE_MAX];
1536
1537 while (fgets(line, sizeof(line), fd) != NULL) {
1538 if ((cp = strchr(line, '\n')) != NULL)
1539 *cp = '\0';
1540 lreply(230, "%s", line);
1541 }
1542 (void) fflush(stdout);
1543 (void) fclose(fd);
1544 }
1545 if (guest) {
1546 if (ident != NULL)
1547 free(ident);
1548 ident = strdup(passwd);
1549 if (ident == NULL)
1550 fatalerror("Ran out of memory.");
1551
1552 reply(230, "Guest login ok, access restrictions apply.");
1553#ifdef SETPROCTITLE
1554#ifdef VIRTUAL_HOSTING
1555 if (thishost != firsthost)
1556 snprintf(proctitle, sizeof(proctitle),
1557 "%s: anonymous(%s)/%s", remotehost, hostname,
1558 passwd);
1559 else
1560#endif
1561 snprintf(proctitle, sizeof(proctitle),
1562 "%s: anonymous/%s", remotehost, passwd);
1563 setproctitle("%s", proctitle);
1564#endif /* SETPROCTITLE */
1565 if (logging)
1566 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1567 remotehost, passwd);
1568 } else {
1569 if (dochroot)
1570 reply(230, "User %s logged in, "
1571 "access restrictions apply.", pw->pw_name);
1572 else
1573 reply(230, "User %s logged in.", pw->pw_name);
1574
1575#ifdef SETPROCTITLE
1576 snprintf(proctitle, sizeof(proctitle),
1577 "%s: user/%s", remotehost, pw->pw_name);
1578 setproctitle("%s", proctitle);
1579#endif /* SETPROCTITLE */
1580 if (logging)
1581 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1582 remotehost, pw->pw_name);
1583 }
1584#ifdef LOGIN_CAP
1585 login_close(lc);
1586#endif
1587 if (chrootdir)
1588 free(chrootdir);
1589 if (residue)
1590 free(residue);
1591 return;
1592bad:
1593 /* Forget all about it... */
1594#ifdef LOGIN_CAP
1595 login_close(lc);
1596#endif
1597 if (chrootdir)
1598 free(chrootdir);
1599 if (residue)
1600 free(residue);
1601 end_login();
1602}
1603
1604void
1605retrieve(cmd, name)
1606 char *cmd, *name;
1607{
1608 FILE *fin, *dout;
1609 struct stat st;
3eefb696 1610 int (*closefunc) (FILE *);
984263bc
MD
1611 time_t start;
1612
1613 if (cmd == 0) {
1614 fin = fopen(name, "r"), closefunc = fclose;
1615 st.st_size = 0;
1616 } else {
1617 char line[BUFSIZ];
1618
1619 (void) snprintf(line, sizeof(line), cmd, name), name = line;
1620 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1621 st.st_size = -1;
1622 st.st_blksize = BUFSIZ;
1623 }
1624 if (fin == NULL) {
1625 if (errno != 0) {
1626 perror_reply(550, name);
1627 if (cmd == 0) {
1628 LOGCMD("get", name);
1629 }
1630 }
1631 return;
1632 }
1633 byte_count = -1;
1634 if (cmd == 0) {
1635 if (fstat(fileno(fin), &st) < 0) {
1636 perror_reply(550, name);
1637 goto done;
1638 }
1639 if (!S_ISREG(st.st_mode)) {
1640 if (guest) {
1641 reply(550, "%s: not a plain file.", name);
1642 goto done;
1643 }
1644 st.st_size = -1;
1645 /* st.st_blksize is set for all descriptor types */
1646 }
1647 }
1648 if (restart_point) {
1649 if (type == TYPE_A) {
1650 off_t i, n;
1651 int c;
1652
1653 n = restart_point;
1654 i = 0;
1655 while (i++ < n) {
1656 if ((c=getc(fin)) == EOF) {
1657 perror_reply(550, name);
1658 goto done;
1659 }
1660 if (c == '\n')
1661 i++;
1662 }
1663 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1664 perror_reply(550, name);
1665 goto done;
1666 }
1667 }
1668 dout = dataconn(name, st.st_size, "w");
1669 if (dout == NULL)
1670 goto done;
1671 time(&start);
1672 send_data(fin, dout, st.st_blksize, st.st_size,
1673 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
1674 if (cmd == 0 && guest && stats)
1675 logxfer(name, st.st_size, start);
1676 (void) fclose(dout);
1677 data = -1;
1678 pdata = -1;
1679done:
1680 if (cmd == 0)
1681 LOGBYTES("get", name, byte_count);
1682 (*closefunc)(fin);
1683}
1684
1685void
1686store(name, mode, unique)
1687 char *name, *mode;
1688 int unique;
1689{
1690 int fd;
1691 FILE *fout, *din;
3eefb696 1692 int (*closefunc) (FILE *);
984263bc
MD
1693
1694 if (*mode == 'a') { /* APPE */
1695 if (unique) {
1696 /* Programming error */
1697 syslog(LOG_ERR, "Internal: unique flag to APPE");
1698 unique = 0;
1699 }
1700 if (guest && noguestmod) {
1701 reply(550, "Appending to existing file denied");
1702 goto err;
1703 }
1704 restart_point = 0; /* not affected by preceding REST */
1705 }
1706 if (unique) /* STOU overrides REST */
1707 restart_point = 0;
1708 if (guest && noguestmod) {
1709 if (restart_point) { /* guest STOR w/REST */
1710 reply(550, "Modifying existing file denied");
1711 goto err;
1712 } else /* treat guest STOR as STOU */
1713 unique = 1;
1714 }
1715
1716 if (restart_point)
1717 mode = "r+"; /* so ASCII manual seek can work */
1718 if (unique) {
1719 if ((fd = guniquefd(name, &name)) < 0)
1720 goto err;
1721 fout = fdopen(fd, mode);
1722 } else
1723 fout = fopen(name, mode);
1724 closefunc = fclose;
1725 if (fout == NULL) {
1726 perror_reply(553, name);
1727 goto err;
1728 }
1729 byte_count = -1;
1730 if (restart_point) {
1731 if (type == TYPE_A) {
1732 off_t i, n;
1733 int c;
1734
1735 n = restart_point;
1736 i = 0;
1737 while (i++ < n) {
1738 if ((c=getc(fout)) == EOF) {
1739 perror_reply(550, name);
1740 goto done;
1741 }
1742 if (c == '\n')
1743 i++;
1744 }
1745 /*
1746 * We must do this seek to "current" position
1747 * because we are changing from reading to
1748 * writing.
1749 */
1750 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) {
1751 perror_reply(550, name);
1752 goto done;
1753 }
1754 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1755 perror_reply(550, name);
1756 goto done;
1757 }
1758 }
1759 din = dataconn(name, (off_t)-1, "r");
1760 if (din == NULL)
1761 goto done;
1762 if (receive_data(din, fout) == 0) {
1763 if (unique)
1764 reply(226, "Transfer complete (unique file name:%s).",
1765 name);
1766 else
1767 reply(226, "Transfer complete.");
1768 }
1769 (void) fclose(din);
1770 data = -1;
1771 pdata = -1;
1772done:
1773 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1774 (*closefunc)(fout);
1775 return;
1776err:
1777 LOGCMD(*mode == 'a' ? "append" : "put" , name);
1778 return;
1779}
1780
1781static FILE *
1782getdatasock(mode)
1783 char *mode;
1784{
1785 int on = 1, s, t, tries;
1786
1787 if (data >= 0)
1788 return (fdopen(data, mode));
984263bc
MD
1789
1790 s = socket(data_dest.su_family, SOCK_STREAM, 0);
1791 if (s < 0)
1792 goto bad;
1793 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1794 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1795 /* anchor socket to avoid multi-homing problems */
1796 data_source = ctrl_addr;
1797 data_source.su_port = htons(dataport);
6b2de43d 1798 (void) seteuid((uid_t)0);
984263bc
MD
1799 for (tries = 1; ; tries++) {
1800 if (bind(s, (struct sockaddr *)&data_source,
1801 data_source.su_len) >= 0)
1802 break;
1803 if (errno != EADDRINUSE || tries > 10)
1804 goto bad;
1805 sleep(tries);
1806 }
1807 (void) seteuid((uid_t)pw->pw_uid);
1808#ifdef IP_TOS
1809 if (data_source.su_family == AF_INET)
1810 {
1811 on = IPTOS_THROUGHPUT;
1812 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1813 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1814 }
1815#endif
1816#ifdef TCP_NOPUSH
1817 /*
1818 * Turn off push flag to keep sender TCP from sending short packets
1819 * at the boundaries of each write(). Should probably do a SO_SNDBUF
1820 * to set the send buffer size as well, but that may not be desirable
1821 * in heavy-load situations.
1822 */
1823 on = 1;
1824 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1825 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1826#endif
1827#ifdef SO_SNDBUF
1828 on = 65536;
1829 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0)
1830 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m");
1831#endif
1832
1833 return (fdopen(s, mode));
1834bad:
1835 /* Return the real value of errno (close may change it) */
1836 t = errno;
1837 (void) seteuid((uid_t)pw->pw_uid);
1838 (void) close(s);
1839 errno = t;
1840 return (NULL);
1841}
1842
1843static FILE *
1844dataconn(name, size, mode)
1845 char *name;
1846 off_t size;
1847 char *mode;
1848{
1849 char sizebuf[32];
1850 FILE *file;
1851 int retry = 0, tos, conerrno;
1852
1853 file_size = size;
1854 byte_count = 0;
1855 if (size != (off_t) -1)
1856 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size);
1857 else
1858 *sizebuf = '\0';
1859 if (pdata >= 0) {
1860 union sockunion from;
1861 int flags;
1862 int s, fromlen = ctrl_addr.su_len;
1863 struct timeval timeout;
1864 fd_set set;
1865
1866 FD_ZERO(&set);
1867 FD_SET(pdata, &set);
1868
1869 timeout.tv_usec = 0;
1870 timeout.tv_sec = 120;
1871
1872 /*
1873 * Granted a socket is in the blocking I/O mode,
1874 * accept() will block after a successful select()
1875 * if the selected connection dies in between.
1876 * Therefore set the non-blocking I/O flag here.
1877 */
1878 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1879 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1880 goto pdata_err;
1881 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 ||
1882 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1883 goto pdata_err;
1884 (void) close(pdata);
1885 pdata = s;
1886 /*
1887 * Unset the inherited non-blocking I/O flag
1888 * on the child socket so stdio can work on it.
1889 */
1890 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1891 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
1892 goto pdata_err;
1893#ifdef IP_TOS
1894 if (from.su_family == AF_INET)
1895 {
1896 tos = IPTOS_THROUGHPUT;
1897 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
1898 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
1899 }
1900#endif
1901 reply(150, "Opening %s mode data connection for '%s'%s.",
1902 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1903 return (fdopen(pdata, mode));
1904pdata_err:
1905 reply(425, "Can't open data connection.");
1906 (void) close(pdata);
1907 pdata = -1;
1908 return (NULL);
1909 }
1910 if (data >= 0) {
1911 reply(125, "Using existing data connection for '%s'%s.",
1912 name, sizebuf);
1913 usedefault = 1;
1914 return (fdopen(data, mode));
1915 }
1916 if (usedefault)
1917 data_dest = his_addr;
1918 usedefault = 1;
1919 do {
1920 file = getdatasock(mode);
1921 if (file == NULL) {
1922 char hostbuf[BUFSIZ], portbuf[BUFSIZ];
1923 getnameinfo((struct sockaddr *)&data_source,
1924 data_source.su_len, hostbuf, sizeof(hostbuf) - 1,
1925 portbuf, sizeof(portbuf),
1926 NI_NUMERICHOST|NI_NUMERICSERV);
1927 reply(425, "Can't create data socket (%s,%s): %s.",
1928 hostbuf, portbuf, strerror(errno));
1929 return (NULL);
1930 }
1931 data = fileno(file);
1932 conerrno = 0;
1933 if (connect(data, (struct sockaddr *)&data_dest,
1934 data_dest.su_len) == 0)
1935 break;
1936 conerrno = errno;
1937 (void) fclose(file);
1938 data = -1;
1939 if (conerrno == EADDRINUSE) {
1940 sleep((unsigned) swaitint);
1941 retry += swaitint;
1942 } else {
1943 break;
1944 }
1945 } while (retry <= swaitmax);
1946 if (conerrno != 0) {
1947 perror_reply(425, "Can't build data connection");
1948 return (NULL);
1949 }
1950 reply(150, "Opening %s mode data connection for '%s'%s.",
1951 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1952 return (file);
1953}
1954
1955/*
1956 * Tranfer the contents of "instr" to "outstr" peer using the appropriate
1957 * encapsulation of the data subject to Mode, Structure, and Type.
1958 *
1959 * NB: Form isn't handled.
1960 */
1961static int
1962send_data(instr, outstr, blksize, filesize, isreg)
1963 FILE *instr, *outstr;
1964 off_t blksize;
1965 off_t filesize;
1966 int isreg;
1967{
1968 int c, filefd, netfd;
1969 char *buf;
1970 off_t cnt;
1971
1972 transflag++;
1973 switch (type) {
1974
1975 case TYPE_A:
1976 while ((c = getc(instr)) != EOF) {
1977 if (recvurg)
1978 goto got_oob;
1979 byte_count++;
1980 if (c == '\n') {
1981 if (ferror(outstr))
1982 goto data_err;
1983 (void) putc('\r', outstr);
1984 }
1985 (void) putc(c, outstr);
1986 }
1987 if (recvurg)
1988 goto got_oob;
1989 fflush(outstr);
1990 transflag = 0;
1991 if (ferror(instr))
1992 goto file_err;
1993 if (ferror(outstr))
1994 goto data_err;
1995 reply(226, "Transfer complete.");
1996 return (0);
1997
1998 case TYPE_I:
1999 case TYPE_L:
2000 /*
2001 * isreg is only set if we are not doing restart and we
2002 * are sending a regular file
2003 */
2004 netfd = fileno(outstr);
2005 filefd = fileno(instr);
2006
2007 if (isreg) {
2008
2009 off_t offset;
2010 int err;
2011
2012 err = cnt = offset = 0;
2013
2014 while (err != -1 && filesize > 0) {
2015 err = sendfile(filefd, netfd, offset, 0,
2016 (struct sf_hdtr *) NULL, &cnt, 0);
2017 /*
2018 * Calculate byte_count before OOB processing.
2019 * It can be used in myoob() later.
2020 */
2021 byte_count += cnt;
2022 if (recvurg)
2023 goto got_oob;
2024 offset += cnt;
2025 filesize -= cnt;
2026
2027 if (err == -1) {
2028 if (!cnt)
2029 goto oldway;
2030
2031 goto data_err;
2032 }
2033 }
2034
2035 transflag = 0;
2036 reply(226, "Transfer complete.");
2037 return (0);
2038 }
2039
2040oldway:
2041 if ((buf = malloc((u_int)blksize)) == NULL) {
2042 transflag = 0;
2043 perror_reply(451, "Local resource failure: malloc");
2044 return (-1);
2045 }
2046
2047 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
2048 write(netfd, buf, cnt) == cnt)
2049 byte_count += cnt;
2050 transflag = 0;
2051 (void)free(buf);
2052 if (cnt != 0) {
2053 if (cnt < 0)
2054 goto file_err;
2055 goto data_err;
2056 }
2057 reply(226, "Transfer complete.");
2058 return (0);
2059 default:
2060 transflag = 0;
2061 reply(550, "Unimplemented TYPE %d in send_data", type);
2062 return (-1);
2063 }
2064
2065data_err:
2066 transflag = 0;
2067 perror_reply(426, "Data connection");
2068 return (-1);
2069
2070file_err:
2071 transflag = 0;
2072 perror_reply(551, "Error on input file");
2073 return (-1);
2074
2075got_oob:
2076 myoob();
2077 recvurg = 0;
2078 transflag = 0;
2079 return (-1);
2080}
2081
2082/*
2083 * Transfer data from peer to "outstr" using the appropriate encapulation of
2084 * the data subject to Mode, Structure, and Type.
2085 *
2086 * N.B.: Form isn't handled.
2087 */
2088static int
2089receive_data(instr, outstr)
2090 FILE *instr, *outstr;
2091{
2092 int c;
2093 int cnt, bare_lfs;
2094 char buf[BUFSIZ];
2095
2096 transflag++;
2097 bare_lfs = 0;
2098
2099 switch (type) {
2100
2101 case TYPE_I:
2102 case TYPE_L:
2103 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) {
2104 if (recvurg)
2105 goto got_oob;
2106 if (write(fileno(outstr), buf, cnt) != cnt)
2107 goto file_err;
2108 byte_count += cnt;
2109 }
2110 if (recvurg)
2111 goto got_oob;
2112 if (cnt < 0)
2113 goto data_err;
2114 transflag = 0;
2115 return (0);
2116
2117 case TYPE_E:
2118 reply(553, "TYPE E not implemented.");
2119 transflag = 0;
2120 return (-1);
2121
2122 case TYPE_A:
2123 while ((c = getc(instr)) != EOF) {
2124 if (recvurg)
2125 goto got_oob;
2126 byte_count++;
2127 if (c == '\n')
2128 bare_lfs++;
2129 while (c == '\r') {
2130 if (ferror(outstr))
2131 goto data_err;
2132 if ((c = getc(instr)) != '\n') {
2133 (void) putc ('\r', outstr);
2134 if (c == '\0' || c == EOF)
2135 goto contin2;
2136 }
2137 }
2138 (void) putc(c, outstr);
2139 contin2: ;
2140 }
2141 if (recvurg)
2142 goto got_oob;
2143 fflush(outstr);
2144 if (ferror(instr))
2145 goto data_err;
2146 if (ferror(outstr))
2147 goto file_err;
2148 transflag = 0;
2149 if (bare_lfs) {
2150 lreply(226,
2151 "WARNING! %d bare linefeeds received in ASCII mode",
2152 bare_lfs);
2153 (void)printf(" File may not have transferred correctly.\r\n");
2154 }
2155 return (0);
2156 default:
2157 reply(550, "Unimplemented TYPE %d in receive_data", type);
2158 transflag = 0;
2159 return (-1);
2160 }
2161
2162data_err:
2163 transflag = 0;
2164 perror_reply(426, "Data Connection");
2165 return (-1);
2166
2167file_err:
2168 transflag = 0;
2169 perror_reply(452, "Error writing file");
2170 return (-1);
2171
2172got_oob:
2173 myoob();
2174 recvurg = 0;
2175 transflag = 0;
2176 return (-1);
2177}
2178
2179void
2180statfilecmd(filename)
2181 char *filename;
2182{
2183 FILE *fin;
2184 int atstart;
2185 int c;
2186 char line[LINE_MAX];
2187
2188 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
2189 fin = ftpd_popen(line, "r");
2190 lreply(211, "status of %s:", filename);
2191 atstart = 1;
2192 while ((c = getc(fin)) != EOF) {
2193 if (c == '\n') {
2194 if (ferror(stdout)){
2195 perror_reply(421, "control connection");
2196 (void) ftpd_pclose(fin);
2197 dologout(1);
2198 /* NOTREACHED */
2199 }
2200 if (ferror(fin)) {
2201 perror_reply(551, filename);
2202 (void) ftpd_pclose(fin);
2203 return;
2204 }
2205 (void) putc('\r', stdout);
2206 }
2207 /*
2208 * RFC 959 says neutral text should be prepended before
2209 * a leading 3-digit number followed by whitespace, but
2210 * many ftp clients can be confused by any leading digits,
2211 * as a matter of fact.
2212 */
2213 if (atstart && isdigit(c))
2214 (void) putc(' ', stdout);
2215 (void) putc(c, stdout);
2216 atstart = (c == '\n');
2217 }
2218 (void) ftpd_pclose(fin);
2219 reply(211, "End of Status");
2220}
2221
2222void
2223statcmd()
2224{
2225 union sockunion *su;
2226 u_char *a, *p;
2227 char hname[NI_MAXHOST];
2228 int ispassive;
2229
2230 if (hostinfo) {
2231 lreply(211, "%s FTP server status:", hostname);
2232 printf(" %s\r\n", version);
2233 } else
2234 lreply(211, "FTP server status:");
2235 printf(" Connected to %s", remotehost);
2236 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2237 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
2238 if (strcmp(hname, remotehost) != 0)
2239 printf(" (%s)", hname);
2240 }
2241 printf("\r\n");
2242 if (logged_in) {
2243 if (guest)
2244 printf(" Logged in anonymously\r\n");
2245 else
2246 printf(" Logged in as %s\r\n", pw->pw_name);
2247 } else if (askpasswd)
2248 printf(" Waiting for password\r\n");
2249 else
2250 printf(" Waiting for user name\r\n");
2251 printf(" TYPE: %s", typenames[type]);
2252 if (type == TYPE_A || type == TYPE_E)
2253 printf(", FORM: %s", formnames[form]);
2254 if (type == TYPE_L)
2255#if NBBY == 8
2256 printf(" %d", NBBY);
2257#else
2258 printf(" %d", bytesize); /* need definition! */
2259#endif
2260 printf("; STRUcture: %s; transfer MODE: %s\r\n",
2261 strunames[stru], modenames[mode]);
2262 if (data != -1)
2263 printf(" Data connection open\r\n");
2264 else if (pdata != -1) {
2265 ispassive = 1;
2266 su = &pasv_addr;
2267 goto printaddr;
2268 } else if (usedefault == 0) {
2269 ispassive = 0;
2270 su = &data_dest;
2271printaddr:
2272#define UC(b) (((int) b) & 0xff)
2273 if (epsvall) {
2274 printf(" EPSV only mode (EPSV ALL)\r\n");
2275 goto epsvonly;
2276 }
2277
2278 /* PORT/PASV */
2279 if (su->su_family == AF_INET) {
2280 a = (u_char *) &su->su_sin.sin_addr;
2281 p = (u_char *) &su->su_sin.sin_port;
2282 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n",
2283 ispassive ? "PASV" : "PORT",
2284 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2285 UC(p[0]), UC(p[1]));
2286 }
2287
2288 /* LPRT/LPSV */
2289 {
2290 int alen, af, i;
2291
2292 switch (su->su_family) {
2293 case AF_INET:
2294 a = (u_char *) &su->su_sin.sin_addr;
2295 p = (u_char *) &su->su_sin.sin_port;
2296 alen = sizeof(su->su_sin.sin_addr);
2297 af = 4;
2298 break;
2299 case AF_INET6:
2300 a = (u_char *) &su->su_sin6.sin6_addr;
2301 p = (u_char *) &su->su_sin6.sin6_port;
2302 alen = sizeof(su->su_sin6.sin6_addr);
2303 af = 6;
2304 break;
2305 default:
2306 af = 0;
2307 break;
2308 }
2309 if (af) {
2310 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2311 af, alen);
2312 for (i = 0; i < alen; i++)
2313 printf("%d,", UC(a[i]));
2314 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2315 }
2316 }
2317
2318epsvonly:;
2319 /* EPRT/EPSV */
2320 {
2321 int af;
2322
2323 switch (su->su_family) {
2324 case AF_INET:
2325 af = 1;
2326 break;
2327 case AF_INET6:
2328 af = 2;
2329 break;
2330 default:
2331 af = 0;
2332 break;
2333 }
2334 if (af) {
2335 union sockunion tmp;
2336
2337 tmp = *su;
2338 if (tmp.su_family == AF_INET6)
2339 tmp.su_sin6.sin6_scope_id = 0;
2340 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2341 hname, sizeof(hname) - 1, NULL, 0,
2342 NI_NUMERICHOST)) {
2343 printf(" %s |%d|%s|%d|\r\n",
2344 ispassive ? "EPSV" : "EPRT",
2345 af, hname, htons(tmp.su_port));
2346 }
2347 }
2348 }
2349#undef UC
2350 } else
2351 printf(" No data connection\r\n");
2352 reply(211, "End of status");
2353}
2354
2355void
2356fatalerror(s)
2357 char *s;
2358{
2359
2360 reply(451, "Error in server: %s\n", s);
2361 reply(221, "Closing connection due to server error.");
2362 dologout(0);
2363 /* NOTREACHED */
2364}
2365
2366void
2367#if __STDC__
2368reply(int n, const char *fmt, ...)
2369#else
2370reply(n, fmt, va_alist)
2371 int n;
2372 char *fmt;
2373 va_dcl
2374#endif
2375{
2376 va_list ap;
2377#if __STDC__
2378 va_start(ap, fmt);
2379#else
2380 va_start(ap);
2381#endif
2382 (void)printf("%d ", n);
2383 (void)vprintf(fmt, ap);
2384 (void)printf("\r\n");
2385 (void)fflush(stdout);
2386 if (ftpdebug) {
2387 syslog(LOG_DEBUG, "<--- %d ", n);
2388 vsyslog(LOG_DEBUG, fmt, ap);
2389 }
2390}
2391
2392void
2393#if __STDC__
2394lreply(int n, const char *fmt, ...)
2395#else
2396lreply(n, fmt, va_alist)
2397 int n;
2398 char *fmt;
2399 va_dcl
2400#endif
2401{
2402 va_list ap;
2403#if __STDC__
2404 va_start(ap, fmt);
2405#else
2406 va_start(ap);
2407#endif
2408 (void)printf("%d- ", n);
2409 (void)vprintf(fmt, ap);
2410 (void)printf("\r\n");
2411 (void)fflush(stdout);
2412 if (ftpdebug) {
2413 syslog(LOG_DEBUG, "<--- %d- ", n);
2414 vsyslog(LOG_DEBUG, fmt, ap);
2415 }
2416}
2417
2418static void
2419ack(s)
2420 char *s;
2421{
2422
2423 reply(250, "%s command successful.", s);
2424}
2425
2426void
2427nack(s)
2428 char *s;
2429{
2430
2431 reply(502, "%s command not implemented.", s);
2432}
2433
2434/* ARGSUSED */
2435void
2436yyerror(s)
2437 char *s;
2438{
2439 char *cp;
2440
2441 if ((cp = strchr(cbuf,'\n')))
2442 *cp = '\0';
2443 reply(500, "'%s': command not understood.", cbuf);
2444}
2445
2446void
2447delete(name)
2448 char *name;
2449{
2450 struct stat st;
2451
2452 LOGCMD("delete", name);
2453 if (lstat(name, &st) < 0) {
2454 perror_reply(550, name);
2455 return;
2456 }
2457 if ((st.st_mode&S_IFMT) == S_IFDIR) {
2458 if (rmdir(name) < 0) {
2459 perror_reply(550, name);
2460 return;
2461 }
2462 goto done;
2463 }
2464 if (unlink(name) < 0) {
2465 perror_reply(550, name);
2466 return;
2467 }
2468done:
2469 ack("DELE");
2470}
2471
2472void
2473cwd(path)
2474 char *path;
2475{
2476
2477 if (chdir(path) < 0)
2478 perror_reply(550, path);
2479 else
2480 ack("CWD");
2481}
2482
2483void
2484makedir(name)
2485 char *name;
2486{
2487 char *s;
2488
2489 LOGCMD("mkdir", name);
2490 if (guest && noguestmkd)
2491 reply(550, "%s: permission denied", name);
2492 else if (mkdir(name, 0777) < 0)
2493 perror_reply(550, name);
2494 else {
2495 if ((s = doublequote(name)) == NULL)
2496 fatalerror("Ran out of memory.");
2497 reply(257, "\"%s\" directory created.", s);
2498 free(s);
2499 }
2500}
2501
2502void
2503removedir(name)
2504 char *name;
2505{
2506
2507 LOGCMD("rmdir", name);
2508 if (rmdir(name) < 0)
2509 perror_reply(550, name);
2510 else
2511 ack("RMD");
2512}
2513
2514void
2515pwd()
2516{
2517 char *s, path[MAXPATHLEN + 1];
2518
2519 if (getwd(path) == (char *)NULL)
2520 reply(550, "%s.", path);
2521 else {
2522 if ((s = doublequote(path)) == NULL)
2523 fatalerror("Ran out of memory.");
2524 reply(257, "\"%s\" is current directory.", s);
2525 free(s);
2526 }
2527}
2528
2529char *
2530renamefrom(name)
2531 char *name;
2532{
2533 struct stat st;
2534
2535 if (lstat(name, &st) < 0) {
2536 perror_reply(550, name);
2537 return ((char *)0);
2538 }
2539 reply(350, "File exists, ready for destination name");
2540 return (name);
2541}
2542
2543void
2544renamecmd(from, to)
2545 char *from, *to;
2546{
2547 struct stat st;
2548
2549 LOGCMD2("rename", from, to);
2550
2551 if (guest && (stat(to, &st) == 0)) {
2552 reply(550, "%s: permission denied", to);
2553 return;
2554 }
2555
2556 if (rename(from, to) < 0)
2557 perror_reply(550, "rename");
2558 else
2559 ack("RNTO");
2560}
2561
2562static void
2563dolog(who)
2564 struct sockaddr *who;
2565{
2566 int error;
2567
2568 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
2569
2570#ifdef SETPROCTITLE
2571#ifdef VIRTUAL_HOSTING
2572 if (thishost != firsthost)
2573 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2574 remotehost, hostname);
2575 else
2576#endif
2577 snprintf(proctitle, sizeof(proctitle), "%s: connected",
2578 remotehost);
2579 setproctitle("%s", proctitle);
2580#endif /* SETPROCTITLE */
2581
2582 if (logging) {
2583#ifdef VIRTUAL_HOSTING
2584 if (thishost != firsthost)
2585 syslog(LOG_INFO, "connection from %s (to %s)",
2586 remotehost, hostname);
2587 else
2588#endif
2589 {
2590 char who_name[MAXHOSTNAMELEN];
2591
2592 error = getnameinfo(who, who->sa_len,
2593 who_name, sizeof(who_name) - 1,
2594 NULL, 0, NI_NUMERICHOST);
2595 syslog(LOG_INFO, "connection from %s (%s)", remotehost,
2596 error == 0 ? who_name : "");
2597 }
2598 }
2599}
2600
2601/*
2602 * Record logout in wtmp file
2603 * and exit with supplied status.
2604 */
2605void
2606dologout(status)
2607 int status;
2608{
2609 /*
2610 * Prevent reception of SIGURG from resulting in a resumption
2611 * back to the main program loop.
2612 */
2613 transflag = 0;
2614
2615 if (logged_in && dowtmp) {
2616 (void) seteuid((uid_t)0);
2617 ftpd_logwtmp(ttyline, "", NULL);
2618 }
2619 /* beware of flushing buffers after a SIGPIPE */
2620 _exit(status);
2621}
2622
2623static void
2624sigurg(signo)
2625 int signo;
2626{
2627
2628 recvurg = 1;
2629}
2630
2631static void
2632myoob()
2633{
2634 char *cp;
2635
2636 /* only process if transfer occurring */
2637 if (!transflag)
2638 return;
2639 cp = tmpline;
2640 if (getline(cp, 7, stdin) == NULL) {
2641 reply(221, "You could at least say goodbye.");
2642 dologout(0);
2643 }
2644 upper(cp);
2645 if (strcmp(cp, "ABOR\r\n") == 0) {
2646 tmpline[0] = '\0';
2647 reply(426, "Transfer aborted. Data connection closed.");
2648 reply(226, "Abort successful");
2649 }
2650 if (strcmp(cp, "STAT\r\n") == 0) {
2651 tmpline[0] = '\0';
2652 if (file_size != (off_t) -1)
2653 reply(213, "Status: %qd of %qd bytes transferred",
2654 byte_count, file_size);
2655 else
2656 reply(213, "Status: %qd bytes transferred", byte_count);
2657 }
2658}
2659
2660/*
2661 * Note: a response of 425 is not mentioned as a possible response to
2662 * the PASV command in RFC959. However, it has been blessed as
2663 * a legitimate response by Jon Postel in a telephone conversation
2664 * with Rick Adams on 25 Jan 89.
2665 */
2666void
2667passive()
2668{
2669 int len, on;
2670 char *p, *a;
2671
2672 if (pdata >= 0) /* close old port if one set */
2673 close(pdata);
2674
2675 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2676 if (pdata < 0) {
2677 perror_reply(425, "Can't open passive connection");
2678 return;
2679 }
2680 on = 1;
2681 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2682 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2683
2684 (void) seteuid((uid_t)0);
2685
2686#ifdef IP_PORTRANGE
2687 if (ctrl_addr.su_family == AF_INET) {
2688 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2689 : IP_PORTRANGE_DEFAULT;
2690
2691 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2692 &on, sizeof(on)) < 0)
2693 goto pasv_error;
2694 }
2695#endif
2696#ifdef IPV6_PORTRANGE
2697 if (ctrl_addr.su_family == AF_INET6) {
2698 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2699 : IPV6_PORTRANGE_DEFAULT;
2700
2701 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2702 &on, sizeof(on)) < 0)
2703 goto pasv_error;
2704 }
2705#endif
2706
2707 pasv_addr = ctrl_addr;
2708 pasv_addr.su_port = 0;
2709 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2710 goto pasv_error;
2711
2712 (void) seteuid((uid_t)pw->pw_uid);
2713
2714 len = sizeof(pasv_addr);
2715 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2716 goto pasv_error;
2717 if (listen(pdata, 1) < 0)
2718 goto pasv_error;
2719 if (pasv_addr.su_family == AF_INET)
2720 a = (char *) &pasv_addr.su_sin.sin_addr;
2721 else if (pasv_addr.su_family == AF_INET6 &&
2722 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2723 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2724 else
2725 goto pasv_error;
2726
2727 p = (char *) &pasv_addr.su_port;
2728
2729#define UC(b) (((int) b) & 0xff)
2730
2731 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2732 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2733 return;
2734
2735pasv_error:
2736 (void) seteuid((uid_t)pw->pw_uid);
2737 (void) close(pdata);
2738 pdata = -1;
2739 perror_reply(425, "Can't open passive connection");
2740 return;
2741}
2742
2743/*
2744 * Long Passive defined in RFC 1639.
2745 * 228 Entering Long Passive Mode
2746 * (af, hal, h1, h2, h3,..., pal, p1, p2...)
2747 */
2748
2749void
2750long_passive(cmd, pf)
2751 char *cmd;
2752 int pf;
2753{
2754 int len, on;
2755 char *p, *a;
2756
2757 if (pdata >= 0) /* close old port if one set */
2758 close(pdata);
2759
2760 if (pf != PF_UNSPEC) {
2761 if (ctrl_addr.su_family != pf) {
2762 switch (ctrl_addr.su_family) {
2763 case AF_INET:
2764 pf = 1;
2765 break;
2766 case AF_INET6:
2767 pf = 2;
2768 break;
2769 default:
2770 pf = 0;
2771 break;
2772 }
2773 /*
2774 * XXX
2775 * only EPRT/EPSV ready clients will understand this
2776 */
2777 if (strcmp(cmd, "EPSV") == 0 && pf) {
2778 reply(522, "Network protocol mismatch, "
2779 "use (%d)", pf);
2780 } else
2781 reply(501, "Network protocol mismatch"); /*XXX*/
2782
2783 return;
2784 }
2785 }
2786
2787 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2788 if (pdata < 0) {
2789 perror_reply(425, "Can't open passive connection");
2790 return;
2791 }
2792 on = 1;
2793 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2794 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2795
2796 (void) seteuid((uid_t)0);
2797
2798 pasv_addr = ctrl_addr;
2799 pasv_addr.su_port = 0;
2800 len = pasv_addr.su_len;
2801
2802#ifdef IP_PORTRANGE
2803 if (ctrl_addr.su_family == AF_INET) {
2804 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2805 : IP_PORTRANGE_DEFAULT;
2806
2807 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2808 &on, sizeof(on)) < 0)
2809 goto pasv_error;
2810 }
2811#endif
2812#ifdef IPV6_PORTRANGE
2813 if (ctrl_addr.su_family == AF_INET6) {
2814 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2815 : IPV6_PORTRANGE_DEFAULT;
2816
2817 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2818 &on, sizeof(on)) < 0)
2819 goto pasv_error;
2820 }
2821#endif
2822
2823 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
2824 goto pasv_error;
2825
2826 (void) seteuid((uid_t)pw->pw_uid);
2827
2828 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2829 goto pasv_error;
2830 if (listen(pdata, 1) < 0)
2831 goto pasv_error;
2832
2833#define UC(b) (((int) b) & 0xff)
2834
2835 if (strcmp(cmd, "LPSV") == 0) {
2836 p = (char *)&pasv_addr.su_port;
2837 switch (pasv_addr.su_family) {
2838 case AF_INET:
2839 a = (char *) &pasv_addr.su_sin.sin_addr;
2840 v4_reply:
2841 reply(228,
2842"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2843 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2844 2, UC(p[0]), UC(p[1]));
2845 return;
2846 case AF_INET6:
2847 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
2848 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2849 goto v4_reply;
2850 }
2851 a = (char *) &pasv_addr.su_sin6.sin6_addr;
2852 reply(228,
2853"Entering Long Passive Mode "
2854"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2855 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2856 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
2857 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
2858 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
2859 2, UC(p[0]), UC(p[1]));
2860 return;
2861 }
2862 } else if (strcmp(cmd, "EPSV") == 0) {
2863 switch (pasv_addr.su_family) {
2864 case AF_INET:
2865 case AF_INET6:
2866 reply(229, "Entering Extended Passive Mode (|||%d|)",
2867 ntohs(pasv_addr.su_port));
2868 return;
2869 }
2870 } else {
2871 /* more proper error code? */
2872 }
2873
2874pasv_error:
2875 (void) seteuid((uid_t)pw->pw_uid);
2876 (void) close(pdata);
2877 pdata = -1;
2878 perror_reply(425, "Can't open passive connection");
2879 return;
2880}
2881
2882/*
2883 * Generate unique name for file with basename "local"
2884 * and open the file in order to avoid possible races.
2885 * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
2886 * Return descriptor to the file, set "name" to its name.
2887 *
2888 * Generates failure reply on error.
2889 */
2890static int
2891guniquefd(local, name)
2892 char *local;
2893 char **name;
2894{
2895 static char new[MAXPATHLEN];
2896 struct stat st;
2897 char *cp;
2898 int count;
2899 int fd;
2900
2901 cp = strrchr(local, '/');
2902 if (cp)
2903 *cp = '\0';
2904 if (stat(cp ? local : ".", &st) < 0) {
2905 perror_reply(553, cp ? local : ".");
2906 return (-1);
2907 }
2908 if (cp) {
2909 /*
2910 * Let not overwrite dirname with counter suffix.
2911 * -4 is for /nn\0
2912 * In this extreme case dot won't be put in front of suffix.
2913 */
2914 if (strlen(local) > sizeof(new) - 4) {
2915 reply(553, "Pathname too long");
2916 return (-1);
2917 }
2918 *cp = '/';
2919 }
2920 /* -4 is for the .nn<null> we put on the end below */
2921 (void) snprintf(new, sizeof(new) - 4, "%s", local);
2922 cp = new + strlen(new);
2923 /*
2924 * Don't generate dotfile unless requested explicitly.
2925 * This covers the case when basename gets truncated off
2926 * by buffer size.
2927 */
2928 if (cp > new && cp[-1] != '/')
2929 *cp++ = '.';
2930 for (count = 0; count < 100; count++) {
2931 /* At count 0 try unmodified name */
2932 if (count)
2933 (void)sprintf(cp, "%d", count);
2934 if ((fd = open(count ? new : local,
2935 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
2936 *name = count ? new : local;
2937 return (fd);
2938 }
2939 if (errno != EEXIST) {
2940 perror_reply(553, count ? new : local);
2941 return (-1);
2942 }
2943 }
2944 reply(452, "Unique file name cannot be created.");
2945 return (-1);
2946}
2947
2948/*
2949 * Format and send reply containing system error number.
2950 */
2951void
2952perror_reply(code, string)
2953 int code;
2954 char *string;
2955{
2956
2957 reply(code, "%s: %s.", string, strerror(errno));
2958}
2959
2960static char *onefile[] = {
2961 "",
2962 0
2963};
2964
2965void
2966send_file_list(whichf)
2967 char *whichf;
2968{
2969 struct stat st;
2970 DIR *dirp = NULL;
2971 struct dirent *dir;
2972 FILE *dout = NULL;
2973 char **dirlist, *dirname;
2974 int simple = 0;
2975 int freeglob = 0;
2976 glob_t gl;
2977
2978 if (strpbrk(whichf, "~{[*?") != NULL) {
2979 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
2980
2981 memset(&gl, 0, sizeof(gl));
2982 gl.gl_matchc = MAXGLOBARGS;
2983 flags |= GLOB_LIMIT;
2984 freeglob = 1;
2985 if (glob(whichf, flags, 0, &gl)) {
2986 reply(550, "not found");
2987 goto out;
2988 } else if (gl.gl_pathc == 0) {
2989 errno = ENOENT;
2990 perror_reply(550, whichf);
2991 goto out;
2992 }
2993 dirlist = gl.gl_pathv;
2994 } else {
2995 onefile[0] = whichf;
2996 dirlist = onefile;
2997 simple = 1;
2998 }
2999
3000 while ((dirname = *dirlist++)) {
3001 if (stat(dirname, &st) < 0) {
3002 /*
3003 * If user typed "ls -l", etc, and the client
3004 * used NLST, do what the user meant.
3005 */
3006 if (dirname[0] == '-' && *dirlist == NULL &&
3007 transflag == 0) {
3008 retrieve(_PATH_LS " %s", dirname);
3009 goto out;
3010 }
3011 perror_reply(550, whichf);
3012 if (dout != NULL) {
3013 (void) fclose(dout);
3014 transflag = 0;
3015 data = -1;
3016 pdata = -1;
3017 }
3018 goto out;
3019 }
3020
3021 if (S_ISREG(st.st_mode)) {
3022 if (dout == NULL) {
3023 dout = dataconn("file list", (off_t)-1, "w");
3024 if (dout == NULL)
3025 goto out;
3026 transflag++;
3027 }
3028 fprintf(dout, "%s%s\n", dirname,
3029 type == TYPE_A ? "\r" : "");
3030 byte_count += strlen(dirname) + 1;
3031 continue;
3032 } else if (!S_ISDIR(st.st_mode))
3033 continue;
3034
3035 if ((dirp = opendir(dirname)) == NULL)
3036 continue;
3037
3038 while ((dir = readdir(dirp)) != NULL) {
3039 char nbuf[MAXPATHLEN];
3040
3041 if (recvurg) {
3042 myoob();
3043 recvurg = 0;
3044 transflag = 0;
3045 goto out;
3046 }
3047
3c36c955 3048 if (strcmp(dir->d_name, ".") == 0)
984263bc 3049 continue;
3c36c955 3050 if (strcmp(dir->d_name, "..") == 0)
984263bc
MD
3051 continue;
3052
3053 snprintf(nbuf, sizeof(nbuf),
3054 "%s/%s", dirname, dir->d_name);
3055
3056 /*
3057 * We have to do a stat to insure it's
3058 * not a directory or special file.
3059 */
3060 if (simple || (stat(nbuf, &st) == 0 &&
3061 S_ISREG(st.st_mode))) {
3062 if (dout == NULL) {
3063 dout = dataconn("file list", (off_t)-1,
3064 "w");
3065 if (dout == NULL)
3066 goto out;
3067 transflag++;
3068 }
3069 if (nbuf[0] == '.' && nbuf[1] == '/')
3070 fprintf(dout, "%s%s\n", &nbuf[2],
3071 type == TYPE_A ? "\r" : "");
3072 else
3073 fprintf(dout, "%s%s\n", nbuf,
3074 type == TYPE_A ? "\r" : "");
3075 byte_count += strlen(nbuf) + 1;
3076 }
3077 }
3078 (void) closedir(dirp);
3079 }
3080
3081 if (dout == NULL)
3082 reply(550, "No files found.");
3083 else if (ferror(dout) != 0)
3084 perror_reply(550, "Data connection");
3085 else
3086 reply(226, "Transfer complete.");
3087
3088 transflag = 0;
3089 if (dout != NULL)
3090 (void) fclose(dout);
3091 data = -1;
3092 pdata = -1;
3093out:
3094 if (freeglob) {
3095 freeglob = 0;
3096 globfree(&gl);
3097 }
3098}
3099
3100void
3101reapchild(signo)
3102 int signo;
3103{
3104 while (wait3(NULL, WNOHANG, NULL) > 0);
3105}
3106
3107#ifdef OLD_SETPROCTITLE
3108/*
3109 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.)
3110 * Warning, since this is usually started from inetd.conf, it often doesn't
3111 * have much of an environment or arglist to overwrite.
3112 */
3113void
3114#if __STDC__
3115setproctitle(const char *fmt, ...)
3116#else
3117setproctitle(fmt, va_alist)
3118 char *fmt;
3119 va_dcl
3120#endif
3121{
3122 int i;
3123 va_list ap;
3124 char *p, *bp, ch;
3125 char buf[LINE_MAX];
3126
3127#if __STDC__
3128 va_start(ap, fmt);
3129#else
3130 va_start(ap);
3131#endif
3132 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
3133
3134 /* make ps print our process name */
3135 p = Argv[0];
3136 *p++ = '-';
3137
3138 i = strlen(buf);
3139 if (i > LastArgv - p - 2) {
3140 i = LastArgv - p - 2;
3141 buf[i] = '\0';
3142 }
3143 bp = buf;
3144 while (ch = *bp++)
3145 if (ch != '\n' && ch != '\r')
3146 *p++ = ch;
3147 while (p < LastArgv)
3148 *p++ = ' ';
3149}
3150#endif /* OLD_SETPROCTITLE */
3151
3152static void
3153logxfer(name, size, start)
3154 char *name;
3155 off_t size;
3156 time_t start;
3157{
3158 char buf[1024];
3159 char path[MAXPATHLEN + 1];
3160 time_t now;
3161
3162 if (statfd >= 0 && getwd(path) != NULL) {
3163 time(&now);
3164 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n",
3165 ctime(&now)+4, ident, remotehost,
3166 path, name, (long long)size,
3167 (long)(now - start + (now == start)));
3168 write(statfd, buf, strlen(buf));
3169 }
3170}
3171
3172static char *
3173doublequote(s)
3174 char *s;
3175{
3176 int n;
3177 char *p, *s2;
3178
3179 for (p = s, n = 0; *p; p++)
3180 if (*p == '"')
3181 n++;
3182
3183 if ((s2 = malloc(p - s + n + 1)) == NULL)
3184 return (NULL);
3185
3186 for (p = s2; *s; s++, p++) {
3187 if ((*p = *s) == '"')
3188 *(++p) = '"';
3189 }
3190 *p = '\0';
3191
3192 return (s2);
3193}