xref: /freebsd/libexec/ftpd/ftpd.c (revision e4e9813eb92cd7c4d4b819a8fbed5cbd3d92f5d8)
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.
32  */
33 
34 #if 0
35 #ifndef lint
36 static char copyright[] =
37 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
38 	The Regents of the University of California.  All rights reserved.\n";
39 #endif /* not lint */
40 #endif
41 
42 #ifndef lint
43 #if 0
44 static char sccsid[] = "@(#)ftpd.c	8.4 (Berkeley) 4/16/94";
45 #endif
46 #endif /* not lint */
47 
48 #include <sys/cdefs.h>
49 __FBSDID("$FreeBSD$");
50 
51 /*
52  * FTP server.
53  */
54 #include <sys/param.h>
55 #include <sys/ioctl.h>
56 #include <sys/mman.h>
57 #include <sys/socket.h>
58 #include <sys/stat.h>
59 #include <sys/time.h>
60 #include <sys/wait.h>
61 
62 #include <netinet/in.h>
63 #include <netinet/in_systm.h>
64 #include <netinet/ip.h>
65 #include <netinet/tcp.h>
66 
67 #define	FTP_NAMES
68 #include <arpa/ftp.h>
69 #include <arpa/inet.h>
70 #include <arpa/telnet.h>
71 
72 #include <ctype.h>
73 #include <dirent.h>
74 #include <err.h>
75 #include <errno.h>
76 #include <fcntl.h>
77 #include <glob.h>
78 #include <limits.h>
79 #include <netdb.h>
80 #include <pwd.h>
81 #include <grp.h>
82 #include <opie.h>
83 #include <signal.h>
84 #include <stdint.h>
85 #include <stdio.h>
86 #include <stdlib.h>
87 #include <string.h>
88 #include <syslog.h>
89 #include <time.h>
90 #include <unistd.h>
91 #include <libutil.h>
92 #ifdef	LOGIN_CAP
93 #include <login_cap.h>
94 #endif
95 
96 #ifdef USE_PAM
97 #include <security/pam_appl.h>
98 #endif
99 
100 #include "pathnames.h"
101 #include "extern.h"
102 
103 #include <stdarg.h>
104 
105 static char version[] = "Version 6.00LS";
106 #undef main
107 
108 extern	off_t restart_point;
109 extern	char cbuf[];
110 
111 union sockunion ctrl_addr;
112 union sockunion data_source;
113 union sockunion data_dest;
114 union sockunion his_addr;
115 union sockunion pasv_addr;
116 
117 int	daemon_mode;
118 int	data;
119 int	dataport;
120 int	hostinfo = 1;	/* print host-specific info in messages */
121 int	logged_in;
122 struct	passwd *pw;
123 char	*homedir;
124 int	ftpdebug;
125 int	timeout = 900;    /* timeout after 15 minutes of inactivity */
126 int	maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
127 int	logging;
128 int	restricted_data_ports = 1;
129 int	paranoid = 1;	  /* be extra careful about security */
130 int	anon_only = 0;    /* Only anonymous ftp allowed */
131 int	guest;
132 int	dochroot;
133 char	*chrootdir;
134 int	dowtmp = 1;
135 int	stats;
136 int	statfd = -1;
137 int	type;
138 int	form;
139 int	stru;			/* avoid C keyword */
140 int	mode;
141 int	usedefault = 1;		/* for data transfers */
142 int	pdata = -1;		/* for passive mode */
143 int	readonly = 0;		/* Server is in readonly mode.	*/
144 int	noepsv = 0;		/* EPSV command is disabled.	*/
145 int	noretr = 0;		/* RETR command is disabled.	*/
146 int	noguestretr = 0;	/* RETR command is disabled for anon users. */
147 int	noguestmkd = 0;		/* MKD command is disabled for anon users. */
148 int	noguestmod = 1;		/* anon users may not modify existing files. */
149 
150 off_t	file_size;
151 off_t	byte_count;
152 #if !defined(CMASK) || CMASK == 0
153 #undef CMASK
154 #define CMASK 027
155 #endif
156 int	defumask = CMASK;		/* default umask value */
157 char	tmpline[7];
158 char	*hostname;
159 int	epsvall = 0;
160 
161 #ifdef VIRTUAL_HOSTING
162 char	*ftpuser;
163 
164 static 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
175 char	remotehost[NI_MAXHOST];
176 char	*ident = NULL;
177 
178 static char	ttyline[20];
179 char		*tty = ttyline;		/* for klogin */
180 
181 #ifdef USE_PAM
182 static int	auth_pam(struct passwd**, const char*);
183 pam_handle_t	*pamh = NULL;
184 #endif
185 
186 static struct opie	opiedata;
187 static char		opieprompt[OPIE_CHALLENGE_MAX+1];
188 static int		pwok;
189 
190 char	*pid_file = NULL; /* means default location to pidfile(3) */
191 
192 /*
193  * Limit number of pathnames that glob can return.
194  * A limit of 0 indicates the number of pathnames is unlimited.
195  */
196 #define MAXGLOBARGS	16384
197 #
198 
199 /*
200  * Timeout intervals for retrying connections
201  * to hosts that don't accept PORT cmds.  This
202  * is a kludge, but given the problems with TCP...
203  */
204 #define	SWAITMAX	90	/* wait at most 90 seconds */
205 #define	SWAITINT	5	/* interval between retries */
206 
207 int	swaitmax = SWAITMAX;
208 int	swaitint = SWAITINT;
209 
210 #ifdef SETPROCTITLE
211 #ifdef OLD_SETPROCTITLE
212 char	**Argv = NULL;		/* pointer to argument vector */
213 char	*LastArgv = NULL;	/* end of argv */
214 #endif /* OLD_SETPROCTITLE */
215 char	proctitle[LINE_MAX];	/* initial part of title */
216 #endif /* SETPROCTITLE */
217 
218 #define LOGCMD(cmd, file)		logcmd((cmd), (file), NULL, -1)
219 #define LOGCMD2(cmd, file1, file2)	logcmd((cmd), (file1), (file2), -1)
220 #define LOGBYTES(cmd, file, cnt)	logcmd((cmd), (file), NULL, (cnt))
221 
222 static	volatile sig_atomic_t recvurg;
223 static	int transflag;		/* NB: for debugging only */
224 
225 #define STARTXFER	flagxfer(1)
226 #define ENDXFER		flagxfer(0)
227 
228 #define START_UNSAFE	maskurg(1)
229 #define END_UNSAFE	maskurg(0)
230 
231 /* It's OK to put an `else' clause after this macro. */
232 #define CHECKOOB(action)						\
233 	if (recvurg) {							\
234 		recvurg = 0;						\
235 		if (myoob()) {						\
236 			ENDXFER;					\
237 			action;						\
238 		}							\
239 	}
240 
241 #ifdef VIRTUAL_HOSTING
242 static void	 inithosts(int);
243 static void	 selecthost(union sockunion *);
244 #endif
245 static void	 ack(char *);
246 static void	 sigurg(int);
247 static void	 maskurg(int);
248 static void	 flagxfer(int);
249 static int	 myoob(void);
250 static int	 checkuser(char *, char *, int, char **);
251 static FILE	*dataconn(char *, off_t, char *);
252 static void	 dolog(struct sockaddr *);
253 static void	 end_login(void);
254 static FILE	*getdatasock(char *);
255 static int	 guniquefd(char *, char **);
256 static void	 lostconn(int);
257 static void	 sigquit(int);
258 static int	 receive_data(FILE *, FILE *);
259 static int	 send_data(FILE *, FILE *, size_t, off_t, int);
260 static struct passwd *
261 		 sgetpwnam(char *);
262 static char	*sgetsave(char *);
263 static void	 reapchild(int);
264 static void	 appendf(char **, char *, ...) __printflike(2, 3);
265 static void	 logcmd(char *, char *, char *, off_t);
266 static void      logxfer(char *, off_t, time_t);
267 static char	*doublequote(char *);
268 static int	*socksetup(int, char *, const char *);
269 
270 int
271 main(int argc, char *argv[], char **envp)
272 {
273 	socklen_t addrlen;
274 	int ch, on = 1, tos;
275 	char *cp, line[LINE_MAX];
276 	FILE *fd;
277 	char	*bindname = NULL;
278 	const char *bindport = "ftp";
279 	int	family = AF_UNSPEC;
280 	struct sigaction sa;
281 
282 	tzset();		/* in case no timezone database in ~ftp */
283 	sigemptyset(&sa.sa_mask);
284 	sa.sa_flags = SA_RESTART;
285 
286 #ifdef OLD_SETPROCTITLE
287 	/*
288 	 *  Save start and extent of argv for setproctitle.
289 	 */
290 	Argv = argv;
291 	while (*envp)
292 		envp++;
293 	LastArgv = envp[-1] + strlen(envp[-1]);
294 #endif /* OLD_SETPROCTITLE */
295 
296 	/*
297 	 * Prevent diagnostic messages from appearing on stderr.
298 	 * We run as a daemon or from inetd; in both cases, there's
299 	 * more reason in logging to syslog.
300 	 */
301 	(void) freopen(_PATH_DEVNULL, "w", stderr);
302 	opterr = 0;
303 
304 	/*
305 	 * LOG_NDELAY sets up the logging connection immediately,
306 	 * necessary for anonymous ftp's that chroot and can't do it later.
307 	 */
308 	openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
309 
310 	while ((ch = getopt(argc, argv,
311 	                    "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) {
312 		switch (ch) {
313 		case '4':
314 			family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
315 			break;
316 
317 		case '6':
318 			family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
319 			break;
320 
321 		case 'a':
322 			bindname = optarg;
323 			break;
324 
325 		case 'A':
326 			anon_only = 1;
327 			break;
328 
329 		case 'd':
330 			ftpdebug++;
331 			break;
332 
333 		case 'D':
334 			daemon_mode++;
335 			break;
336 
337 		case 'E':
338 			noepsv = 1;
339 			break;
340 
341 		case 'h':
342 			hostinfo = 0;
343 			break;
344 
345 		case 'l':
346 			logging++;	/* > 1 == extra logging */
347 			break;
348 
349 		case 'm':
350 			noguestmod = 0;
351 			break;
352 
353 		case 'M':
354 			noguestmkd = 1;
355 			break;
356 
357 		case 'o':
358 			noretr = 1;
359 			break;
360 
361 		case 'O':
362 			noguestretr = 1;
363 			break;
364 
365 		case 'p':
366 			pid_file = optarg;
367 			break;
368 
369 		case 'P':
370 			bindport = optarg;
371 			break;
372 
373 		case 'r':
374 			readonly = 1;
375 			break;
376 
377 		case 'R':
378 			paranoid = 0;
379 			break;
380 
381 		case 'S':
382 			stats++;
383 			break;
384 
385 		case 't':
386 			timeout = atoi(optarg);
387 			if (maxtimeout < timeout)
388 				maxtimeout = timeout;
389 			break;
390 
391 		case 'T':
392 			maxtimeout = atoi(optarg);
393 			if (timeout > maxtimeout)
394 				timeout = maxtimeout;
395 			break;
396 
397 		case 'u':
398 		    {
399 			long val = 0;
400 
401 			val = strtol(optarg, &optarg, 8);
402 			if (*optarg != '\0' || val < 0)
403 				syslog(LOG_WARNING, "bad value for -u");
404 			else
405 				defumask = val;
406 			break;
407 		    }
408 		case 'U':
409 			restricted_data_ports = 0;
410 			break;
411 
412 		case 'v':
413 			ftpdebug++;
414 			break;
415 
416 		case 'W':
417 			dowtmp = 0;
418 			break;
419 
420 		default:
421 			syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
422 			break;
423 		}
424 	}
425 
426 	if (daemon_mode) {
427 		int *ctl_sock, fd, maxfd = -1, nfds, i;
428 		fd_set defreadfds, readfds;
429 		pid_t pid;
430 		struct pidfh *pfh;
431 
432 		if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) {
433 			if (errno == EEXIST) {
434 				syslog(LOG_ERR, "%s already running, pid %d",
435 				       getprogname(), (int)pid);
436 				exit(1);
437 			}
438 			syslog(LOG_WARNING, "pidfile_open: %m");
439 		}
440 
441 		/*
442 		 * Detach from parent.
443 		 */
444 		if (daemon(1, 1) < 0) {
445 			syslog(LOG_ERR, "failed to become a daemon");
446 			exit(1);
447 		}
448 
449 		if (pfh != NULL && pidfile_write(pfh) == -1)
450 			syslog(LOG_WARNING, "pidfile_write: %m");
451 
452 		sa.sa_handler = reapchild;
453 		(void)sigaction(SIGCHLD, &sa, NULL);
454 
455 #ifdef VIRTUAL_HOSTING
456 		inithosts(family);
457 #endif
458 
459 		/*
460 		 * Open a socket, bind it to the FTP port, and start
461 		 * listening.
462 		 */
463 		ctl_sock = socksetup(family, bindname, bindport);
464 		if (ctl_sock == NULL)
465 			exit(1);
466 
467 		FD_ZERO(&defreadfds);
468 		for (i = 1; i <= *ctl_sock; i++) {
469 			FD_SET(ctl_sock[i], &defreadfds);
470 			if (listen(ctl_sock[i], 32) < 0) {
471 				syslog(LOG_ERR, "control listen: %m");
472 				exit(1);
473 			}
474 			if (maxfd < ctl_sock[i])
475 				maxfd = ctl_sock[i];
476 		}
477 
478 		/*
479 		 * Loop forever accepting connection requests and forking off
480 		 * children to handle them.
481 		 */
482 		while (1) {
483 			FD_COPY(&defreadfds, &readfds);
484 			nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
485 			if (nfds <= 0) {
486 				if (nfds < 0 && errno != EINTR)
487 					syslog(LOG_WARNING, "select: %m");
488 				continue;
489 			}
490 
491 			pid = -1;
492                         for (i = 1; i <= *ctl_sock; i++)
493 				if (FD_ISSET(ctl_sock[i], &readfds)) {
494 					addrlen = sizeof(his_addr);
495 					fd = accept(ctl_sock[i],
496 					    (struct sockaddr *)&his_addr,
497 					    &addrlen);
498 					if (fd == -1) {
499 						syslog(LOG_WARNING,
500 						       "accept: %m");
501 						continue;
502 					}
503 					switch (pid = fork()) {
504 					case 0:
505 						/* child */
506 						(void) dup2(fd, 0);
507 						(void) dup2(fd, 1);
508 						(void) close(fd);
509 						for (i = 1; i <= *ctl_sock; i++)
510 							close(ctl_sock[i]);
511 						if (pfh != NULL)
512 							pidfile_close(pfh);
513 						goto gotchild;
514 					case -1:
515 						syslog(LOG_WARNING, "fork: %m");
516 						/* FALLTHROUGH */
517 					default:
518 						close(fd);
519 					}
520 				}
521 		}
522 	} else {
523 		addrlen = sizeof(his_addr);
524 		if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
525 			syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
526 			exit(1);
527 		}
528 
529 #ifdef VIRTUAL_HOSTING
530 		if (his_addr.su_family == AF_INET6 &&
531 		    IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
532 			family = AF_INET;
533 		else
534 			family = his_addr.su_family;
535 		inithosts(family);
536 #endif
537 	}
538 
539 gotchild:
540 	sa.sa_handler = SIG_DFL;
541 	(void)sigaction(SIGCHLD, &sa, NULL);
542 
543 	sa.sa_handler = sigurg;
544 	sa.sa_flags = 0;		/* don't restart syscalls for SIGURG */
545 	(void)sigaction(SIGURG, &sa, NULL);
546 
547 	sigfillset(&sa.sa_mask);	/* block all signals in handler */
548 	sa.sa_flags = SA_RESTART;
549 	sa.sa_handler = sigquit;
550 	(void)sigaction(SIGHUP, &sa, NULL);
551 	(void)sigaction(SIGINT, &sa, NULL);
552 	(void)sigaction(SIGQUIT, &sa, NULL);
553 	(void)sigaction(SIGTERM, &sa, NULL);
554 
555 	sa.sa_handler = lostconn;
556 	(void)sigaction(SIGPIPE, &sa, NULL);
557 
558 	addrlen = sizeof(ctrl_addr);
559 	if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
560 		syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
561 		exit(1);
562 	}
563 	dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
564 #ifdef VIRTUAL_HOSTING
565 	/* select our identity from virtual host table */
566 	selecthost(&ctrl_addr);
567 #endif
568 #ifdef IP_TOS
569 	if (ctrl_addr.su_family == AF_INET)
570       {
571 	tos = IPTOS_LOWDELAY;
572 	if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
573 		syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
574       }
575 #endif
576 	/*
577 	 * Disable Nagle on the control channel so that we don't have to wait
578 	 * for peer's ACK before issuing our next reply.
579 	 */
580 	if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
581 		syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
582 
583 	data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
584 
585 	/* set this here so klogin can use it... */
586 	(void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
587 
588 	/* Try to handle urgent data inline */
589 #ifdef SO_OOBINLINE
590 	if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
591 		syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
592 #endif
593 
594 #ifdef	F_SETOWN
595 	if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
596 		syslog(LOG_ERR, "fcntl F_SETOWN: %m");
597 #endif
598 	dolog((struct sockaddr *)&his_addr);
599 	/*
600 	 * Set up default state
601 	 */
602 	data = -1;
603 	type = TYPE_A;
604 	form = FORM_N;
605 	stru = STRU_F;
606 	mode = MODE_S;
607 	tmpline[0] = '\0';
608 
609 	/* If logins are disabled, print out the message. */
610 	if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
611 		while (fgets(line, sizeof(line), fd) != NULL) {
612 			if ((cp = strchr(line, '\n')) != NULL)
613 				*cp = '\0';
614 			lreply(530, "%s", line);
615 		}
616 		(void) fflush(stdout);
617 		(void) fclose(fd);
618 		reply(530, "System not available.");
619 		exit(0);
620 	}
621 #ifdef VIRTUAL_HOSTING
622 	fd = fopen(thishost->welcome, "r");
623 #else
624 	fd = fopen(_PATH_FTPWELCOME, "r");
625 #endif
626 	if (fd != NULL) {
627 		while (fgets(line, sizeof(line), fd) != NULL) {
628 			if ((cp = strchr(line, '\n')) != NULL)
629 				*cp = '\0';
630 			lreply(220, "%s", line);
631 		}
632 		(void) fflush(stdout);
633 		(void) fclose(fd);
634 		/* reply(220,) must follow */
635 	}
636 #ifndef VIRTUAL_HOSTING
637 	if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
638 		fatalerror("Ran out of memory.");
639 	if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
640 		hostname[0] = '\0';
641 	hostname[MAXHOSTNAMELEN - 1] = '\0';
642 #endif
643 	if (hostinfo)
644 		reply(220, "%s FTP server (%s) ready.", hostname, version);
645 	else
646 		reply(220, "FTP server ready.");
647 	for (;;)
648 		(void) yyparse();
649 	/* NOTREACHED */
650 }
651 
652 static void
653 lostconn(int signo)
654 {
655 
656 	if (ftpdebug)
657 		syslog(LOG_DEBUG, "lost connection");
658 	dologout(1);
659 }
660 
661 static void
662 sigquit(int signo)
663 {
664 
665 	syslog(LOG_ERR, "got signal %d", signo);
666 	dologout(1);
667 }
668 
669 #ifdef VIRTUAL_HOSTING
670 /*
671  * read in virtual host tables (if they exist)
672  */
673 
674 static void
675 inithosts(int family)
676 {
677 	int insert;
678 	size_t len;
679 	FILE *fp;
680 	char *cp, *mp, *line;
681 	char *hostname;
682 	char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
683 	struct ftphost *hrp, *lhrp;
684 	struct addrinfo hints, *res, *ai;
685 
686 	/*
687 	 * Fill in the default host information
688 	 */
689 	if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
690 		fatalerror("Ran out of memory.");
691 	if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
692 		hostname[0] = '\0';
693 	hostname[MAXHOSTNAMELEN - 1] = '\0';
694 	if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
695 		fatalerror("Ran out of memory.");
696 	hrp->hostname = hostname;
697 	hrp->hostinfo = NULL;
698 
699 	memset(&hints, 0, sizeof(hints));
700 	hints.ai_flags = AI_PASSIVE;
701 	hints.ai_family = family;
702 	hints.ai_socktype = SOCK_STREAM;
703 	if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
704 		hrp->hostinfo = res;
705 	hrp->statfile = _PATH_FTPDSTATFILE;
706 	hrp->welcome  = _PATH_FTPWELCOME;
707 	hrp->loginmsg = _PATH_FTPLOGINMESG;
708 	hrp->anonuser = "ftp";
709 	hrp->next = NULL;
710 	thishost = firsthost = lhrp = hrp;
711 	if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
712 		int addrsize, gothost;
713 		void *addr;
714 		struct hostent *hp;
715 
716 		while ((line = fgetln(fp, &len)) != NULL) {
717 			int	i, hp_error;
718 
719 			/* skip comments */
720 			if (line[0] == '#')
721 				continue;
722 			if (line[len - 1] == '\n') {
723 				line[len - 1] = '\0';
724 				mp = NULL;
725 			} else {
726 				if ((mp = malloc(len + 1)) == NULL)
727 					fatalerror("Ran out of memory.");
728 				memcpy(mp, line, len);
729 				mp[len] = '\0';
730 				line = mp;
731 			}
732 			cp = strtok(line, " \t");
733 			/* skip empty lines */
734 			if (cp == NULL)
735 				goto nextline;
736 			vhost = cp;
737 
738 			/* set defaults */
739 			anonuser = "ftp";
740 			statfile = _PATH_FTPDSTATFILE;
741 			welcome  = _PATH_FTPWELCOME;
742 			loginmsg = _PATH_FTPLOGINMESG;
743 
744 			/*
745 			 * Preparse the line so we can use its info
746 			 * for all the addresses associated with
747 			 * the virtual host name.
748 			 * Field 0, the virtual host name, is special:
749 			 * it's already parsed off and will be strdup'ed
750 			 * later, after we know its canonical form.
751 			 */
752 			for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
753 				if (*cp != '-' && (cp = strdup(cp)))
754 					switch (i) {
755 					case 1:	/* anon user permissions */
756 						anonuser = cp;
757 						break;
758 					case 2: /* statistics file */
759 						statfile = cp;
760 						break;
761 					case 3: /* welcome message */
762 						welcome  = cp;
763 						break;
764 					case 4: /* login message */
765 						loginmsg = cp;
766 						break;
767 					default: /* programming error */
768 						abort();
769 						/* NOTREACHED */
770 					}
771 
772 			hints.ai_flags = AI_PASSIVE;
773 			hints.ai_family = family;
774 			hints.ai_socktype = SOCK_STREAM;
775 			if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
776 				goto nextline;
777 			for (ai = res; ai != NULL && ai->ai_addr != NULL;
778 			     ai = ai->ai_next) {
779 
780 			gothost = 0;
781 			for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
782 				struct addrinfo *hi;
783 
784 				for (hi = hrp->hostinfo; hi != NULL;
785 				     hi = hi->ai_next)
786 					if (hi->ai_addrlen == ai->ai_addrlen &&
787 					    memcmp(hi->ai_addr,
788 						   ai->ai_addr,
789 						   ai->ai_addr->sa_len) == 0) {
790 						gothost++;
791 						break;
792 					}
793 				if (gothost)
794 					break;
795 			}
796 			if (hrp == NULL) {
797 				if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
798 					goto nextline;
799 				hrp->hostname = NULL;
800 				insert = 1;
801 			} else {
802 				if (hrp->hostinfo && hrp->hostinfo != res)
803 					freeaddrinfo(hrp->hostinfo);
804 				insert = 0; /* host already in the chain */
805 			}
806 			hrp->hostinfo = res;
807 
808 			/*
809 			 * determine hostname to use.
810 			 * force defined name if there is a valid alias
811 			 * otherwise fallback to primary hostname
812 			 */
813 			/* XXX: getaddrinfo() can't do alias check */
814 			switch(hrp->hostinfo->ai_family) {
815 			case AF_INET:
816 				addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
817 				addrsize = sizeof(struct in_addr);
818 				break;
819 			case AF_INET6:
820 				addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
821 				addrsize = sizeof(struct in6_addr);
822 				break;
823 			default:
824 				/* should not reach here */
825 				freeaddrinfo(hrp->hostinfo);
826 				if (insert)
827 					free(hrp); /*not in chain, can free*/
828 				else
829 					hrp->hostinfo = NULL; /*mark as blank*/
830 				goto nextline;
831 				/* NOTREACHED */
832 			}
833 			if ((hp = getipnodebyaddr(addr, addrsize,
834 						  hrp->hostinfo->ai_family,
835 						  &hp_error)) != NULL) {
836 				if (strcmp(vhost, hp->h_name) != 0) {
837 					if (hp->h_aliases == NULL)
838 						vhost = hp->h_name;
839 					else {
840 						i = 0;
841 						while (hp->h_aliases[i] &&
842 						       strcmp(vhost, hp->h_aliases[i]) != 0)
843 							++i;
844 						if (hp->h_aliases[i] == NULL)
845 							vhost = hp->h_name;
846 					}
847 				}
848 			}
849 			if (hrp->hostname &&
850 			    strcmp(hrp->hostname, vhost) != 0) {
851 				free(hrp->hostname);
852 				hrp->hostname = NULL;
853 			}
854 			if (hrp->hostname == NULL &&
855 			    (hrp->hostname = strdup(vhost)) == NULL) {
856 				freeaddrinfo(hrp->hostinfo);
857 				hrp->hostinfo = NULL; /* mark as blank */
858 				if (hp)
859 					freehostent(hp);
860 				goto nextline;
861 			}
862 			hrp->anonuser = anonuser;
863 			hrp->statfile = statfile;
864 			hrp->welcome  = welcome;
865 			hrp->loginmsg = loginmsg;
866 			if (insert) {
867 				hrp->next  = NULL;
868 				lhrp->next = hrp;
869 				lhrp = hrp;
870 			}
871 			if (hp)
872 				freehostent(hp);
873 		      }
874 nextline:
875 			if (mp)
876 				free(mp);
877 		}
878 		(void) fclose(fp);
879 	}
880 }
881 
882 static void
883 selecthost(union sockunion *su)
884 {
885 	struct ftphost	*hrp;
886 	u_int16_t port;
887 #ifdef INET6
888 	struct in6_addr *mapped_in6 = NULL;
889 #endif
890 	struct addrinfo *hi;
891 
892 #ifdef INET6
893 	/*
894 	 * XXX IPv4 mapped IPv6 addr consideraton,
895 	 * specified in rfc2373.
896 	 */
897 	if (su->su_family == AF_INET6 &&
898 	    IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
899 		mapped_in6 = &su->su_sin6.sin6_addr;
900 #endif
901 
902 	hrp = thishost = firsthost;	/* default */
903 	port = su->su_port;
904 	su->su_port = 0;
905 	while (hrp != NULL) {
906 	    for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
907 		if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
908 			thishost = hrp;
909 			goto found;
910 		}
911 #ifdef INET6
912 		/* XXX IPv4 mapped IPv6 addr consideraton */
913 		if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
914 		    (memcmp(&mapped_in6->s6_addr[12],
915 			    &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
916 			    sizeof(struct in_addr)) == 0)) {
917 			thishost = hrp;
918 			goto found;
919 		}
920 #endif
921 	    }
922 	    hrp = hrp->next;
923 	}
924 found:
925 	su->su_port = port;
926 	/* setup static variables as appropriate */
927 	hostname = thishost->hostname;
928 	ftpuser = thishost->anonuser;
929 }
930 #endif
931 
932 /*
933  * Helper function for sgetpwnam().
934  */
935 static char *
936 sgetsave(char *s)
937 {
938 	char *new = malloc(strlen(s) + 1);
939 
940 	if (new == NULL) {
941 		reply(421, "Ran out of memory.");
942 		dologout(1);
943 		/* NOTREACHED */
944 	}
945 	(void) strcpy(new, s);
946 	return (new);
947 }
948 
949 /*
950  * Save the result of a getpwnam.  Used for USER command, since
951  * the data returned must not be clobbered by any other command
952  * (e.g., globbing).
953  * NB: The data returned by sgetpwnam() will remain valid until
954  * the next call to this function.  Its difference from getpwnam()
955  * is that sgetpwnam() is known to be called from ftpd code only.
956  */
957 static struct passwd *
958 sgetpwnam(char *name)
959 {
960 	static struct passwd save;
961 	struct passwd *p;
962 
963 	if ((p = getpwnam(name)) == NULL)
964 		return (p);
965 	if (save.pw_name) {
966 		free(save.pw_name);
967 		free(save.pw_passwd);
968 		free(save.pw_gecos);
969 		free(save.pw_dir);
970 		free(save.pw_shell);
971 	}
972 	save = *p;
973 	save.pw_name = sgetsave(p->pw_name);
974 	save.pw_passwd = sgetsave(p->pw_passwd);
975 	save.pw_gecos = sgetsave(p->pw_gecos);
976 	save.pw_dir = sgetsave(p->pw_dir);
977 	save.pw_shell = sgetsave(p->pw_shell);
978 	return (&save);
979 }
980 
981 static int login_attempts;	/* number of failed login attempts */
982 static int askpasswd;		/* had user command, ask for passwd */
983 static char curname[MAXLOGNAME];	/* current USER name */
984 
985 /*
986  * USER command.
987  * Sets global passwd pointer pw if named account exists and is acceptable;
988  * sets askpasswd if a PASS command is expected.  If logged in previously,
989  * need to reset state.  If name is "ftp" or "anonymous", the name is not in
990  * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
991  * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
992  * requesting login privileges.  Disallow anyone who does not have a standard
993  * shell as returned by getusershell().  Disallow anyone mentioned in the file
994  * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
995  */
996 void
997 user(char *name)
998 {
999 	char *cp, *shell;
1000 
1001 	if (logged_in) {
1002 		if (guest) {
1003 			reply(530, "Can't change user from guest login.");
1004 			return;
1005 		} else if (dochroot) {
1006 			reply(530, "Can't change user from chroot user.");
1007 			return;
1008 		}
1009 		end_login();
1010 	}
1011 
1012 	guest = 0;
1013 #ifdef VIRTUAL_HOSTING
1014 	pw = sgetpwnam(thishost->anonuser);
1015 #else
1016 	pw = sgetpwnam("ftp");
1017 #endif
1018 	if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
1019 		if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
1020 		    checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
1021 			reply(530, "User %s access denied.", name);
1022 		else if (pw != NULL) {
1023 			guest = 1;
1024 			askpasswd = 1;
1025 			reply(331,
1026 			"Guest login ok, send your email address as password.");
1027 		} else
1028 			reply(530, "User %s unknown.", name);
1029 		if (!askpasswd && logging)
1030 			syslog(LOG_NOTICE,
1031 			    "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1032 		return;
1033 	}
1034 	if (anon_only != 0) {
1035 		reply(530, "Sorry, only anonymous ftp allowed.");
1036 		return;
1037 	}
1038 
1039 	if ((pw = sgetpwnam(name))) {
1040 		if ((shell = pw->pw_shell) == NULL || *shell == 0)
1041 			shell = _PATH_BSHELL;
1042 		setusershell();
1043 		while ((cp = getusershell()) != NULL)
1044 			if (strcmp(cp, shell) == 0)
1045 				break;
1046 		endusershell();
1047 
1048 		if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
1049 			reply(530, "User %s access denied.", name);
1050 			if (logging)
1051 				syslog(LOG_NOTICE,
1052 				    "FTP LOGIN REFUSED FROM %s, %s",
1053 				    remotehost, name);
1054 			pw = NULL;
1055 			return;
1056 		}
1057 	}
1058 	if (logging)
1059 		strncpy(curname, name, sizeof(curname)-1);
1060 
1061 	pwok = 0;
1062 #ifdef USE_PAM
1063 	/* XXX Kluge! The conversation mechanism needs to be fixed. */
1064 #endif
1065 	if (opiechallenge(&opiedata, name, opieprompt) == 0) {
1066 		pwok = (pw != NULL) &&
1067 		       opieaccessfile(remotehost) &&
1068 		       opiealways(pw->pw_dir);
1069 		reply(331, "Response to %s %s for %s.",
1070 		      opieprompt, pwok ? "requested" : "required", name);
1071 	} else {
1072 		pwok = 1;
1073 		reply(331, "Password required for %s.", name);
1074 	}
1075 	askpasswd = 1;
1076 	/*
1077 	 * Delay before reading passwd after first failed
1078 	 * attempt to slow down passwd-guessing programs.
1079 	 */
1080 	if (login_attempts)
1081 		sleep(login_attempts);
1082 }
1083 
1084 /*
1085  * Check if a user is in the file "fname",
1086  * return a pointer to a malloc'd string with the rest
1087  * of the matching line in "residue" if not NULL.
1088  */
1089 static int
1090 checkuser(char *fname, char *name, int pwset, char **residue)
1091 {
1092 	FILE *fd;
1093 	int found = 0;
1094 	size_t len;
1095 	char *line, *mp, *p;
1096 
1097 	if ((fd = fopen(fname, "r")) != NULL) {
1098 		while (!found && (line = fgetln(fd, &len)) != NULL) {
1099 			/* skip comments */
1100 			if (line[0] == '#')
1101 				continue;
1102 			if (line[len - 1] == '\n') {
1103 				line[len - 1] = '\0';
1104 				mp = NULL;
1105 			} else {
1106 				if ((mp = malloc(len + 1)) == NULL)
1107 					fatalerror("Ran out of memory.");
1108 				memcpy(mp, line, len);
1109 				mp[len] = '\0';
1110 				line = mp;
1111 			}
1112 			/* avoid possible leading and trailing whitespace */
1113 			p = strtok(line, " \t");
1114 			/* skip empty lines */
1115 			if (p == NULL)
1116 				goto nextline;
1117 			/*
1118 			 * if first chr is '@', check group membership
1119 			 */
1120 			if (p[0] == '@') {
1121 				int i = 0;
1122 				struct group *grp;
1123 
1124 				if (p[1] == '\0') /* single @ matches anyone */
1125 					found = 1;
1126 				else {
1127 					if ((grp = getgrnam(p+1)) == NULL)
1128 						goto nextline;
1129 					/*
1130 					 * Check user's default group
1131 					 */
1132 					if (pwset && grp->gr_gid == pw->pw_gid)
1133 						found = 1;
1134 					/*
1135 					 * Check supplementary groups
1136 					 */
1137 					while (!found && grp->gr_mem[i])
1138 						found = strcmp(name,
1139 							grp->gr_mem[i++])
1140 							== 0;
1141 				}
1142 			}
1143 			/*
1144 			 * Otherwise, just check for username match
1145 			 */
1146 			else
1147 				found = strcmp(p, name) == 0;
1148 			/*
1149 			 * Save the rest of line to "residue" if matched
1150 			 */
1151 			if (found && residue) {
1152 				if ((p = strtok(NULL, "")) != NULL)
1153 					p += strspn(p, " \t");
1154 				if (p && *p) {
1155 				 	if ((*residue = strdup(p)) == NULL)
1156 						fatalerror("Ran out of memory.");
1157 				} else
1158 					*residue = NULL;
1159 			}
1160 nextline:
1161 			if (mp)
1162 				free(mp);
1163 		}
1164 		(void) fclose(fd);
1165 	}
1166 	return (found);
1167 }
1168 
1169 /*
1170  * Terminate login as previous user, if any, resetting state;
1171  * used when USER command is given or login fails.
1172  */
1173 static void
1174 end_login(void)
1175 {
1176 #ifdef USE_PAM
1177 	int e;
1178 #endif
1179 
1180 	(void) seteuid(0);
1181 	if (logged_in && dowtmp)
1182 		ftpd_logwtmp(ttyline, "", NULL);
1183 	pw = NULL;
1184 #ifdef	LOGIN_CAP
1185 	setusercontext(NULL, getpwuid(0), 0,
1186 		       LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK|
1187 		       LOGIN_SETMAC);
1188 #endif
1189 #ifdef USE_PAM
1190 	if (pamh) {
1191 		if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
1192 			syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1193 		if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
1194 			syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
1195 		if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
1196 			syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1197 		pamh = NULL;
1198 	}
1199 #endif
1200 	logged_in = 0;
1201 	guest = 0;
1202 	dochroot = 0;
1203 }
1204 
1205 #ifdef USE_PAM
1206 
1207 /*
1208  * the following code is stolen from imap-uw PAM authentication module and
1209  * login.c
1210  */
1211 #define COPY_STRING(s) (s ? strdup(s) : NULL)
1212 
1213 struct cred_t {
1214 	const char *uname;		/* user name */
1215 	const char *pass;		/* password */
1216 };
1217 typedef struct cred_t cred_t;
1218 
1219 static int
1220 auth_conv(int num_msg, const struct pam_message **msg,
1221 	  struct pam_response **resp, void *appdata)
1222 {
1223 	int i;
1224 	cred_t *cred = (cred_t *) appdata;
1225 	struct pam_response *reply;
1226 
1227 	reply = calloc(num_msg, sizeof *reply);
1228 	if (reply == NULL)
1229 		return PAM_BUF_ERR;
1230 
1231 	for (i = 0; i < num_msg; i++) {
1232 		switch (msg[i]->msg_style) {
1233 		case PAM_PROMPT_ECHO_ON:	/* assume want user name */
1234 			reply[i].resp_retcode = PAM_SUCCESS;
1235 			reply[i].resp = COPY_STRING(cred->uname);
1236 			/* PAM frees resp. */
1237 			break;
1238 		case PAM_PROMPT_ECHO_OFF:	/* assume want password */
1239 			reply[i].resp_retcode = PAM_SUCCESS;
1240 			reply[i].resp = COPY_STRING(cred->pass);
1241 			/* PAM frees resp. */
1242 			break;
1243 		case PAM_TEXT_INFO:
1244 		case PAM_ERROR_MSG:
1245 			reply[i].resp_retcode = PAM_SUCCESS;
1246 			reply[i].resp = NULL;
1247 			break;
1248 		default:			/* unknown message style */
1249 			free(reply);
1250 			return PAM_CONV_ERR;
1251 		}
1252 	}
1253 
1254 	*resp = reply;
1255 	return PAM_SUCCESS;
1256 }
1257 
1258 /*
1259  * Attempt to authenticate the user using PAM.  Returns 0 if the user is
1260  * authenticated, or 1 if not authenticated.  If some sort of PAM system
1261  * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1262  * function returns -1.  This can be used as an indication that we should
1263  * fall back to a different authentication mechanism.
1264  */
1265 static int
1266 auth_pam(struct passwd **ppw, const char *pass)
1267 {
1268 	const char *tmpl_user;
1269 	const void *item;
1270 	int rval;
1271 	int e;
1272 	cred_t auth_cred = { (*ppw)->pw_name, pass };
1273 	struct pam_conv conv = { &auth_conv, &auth_cred };
1274 
1275 	e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1276 	if (e != PAM_SUCCESS) {
1277 		/*
1278 		 * In OpenPAM, it's OK to pass NULL to pam_strerror()
1279 		 * if context creation has failed in the first place.
1280 		 */
1281 		syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
1282 		return -1;
1283 	}
1284 
1285 	e = pam_set_item(pamh, PAM_RHOST, remotehost);
1286 	if (e != PAM_SUCCESS) {
1287 		syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1288 			pam_strerror(pamh, e));
1289 		if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1290 			syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1291 		}
1292 		pamh = NULL;
1293 		return -1;
1294 	}
1295 
1296 	e = pam_authenticate(pamh, 0);
1297 	switch (e) {
1298 	case PAM_SUCCESS:
1299 		/*
1300 		 * With PAM we support the concept of a "template"
1301 		 * user.  The user enters a login name which is
1302 		 * authenticated by PAM, usually via a remote service
1303 		 * such as RADIUS or TACACS+.  If authentication
1304 		 * succeeds, a different but related "template" name
1305 		 * is used for setting the credentials, shell, and
1306 		 * home directory.  The name the user enters need only
1307 		 * exist on the remote authentication server, but the
1308 		 * template name must be present in the local password
1309 		 * database.
1310 		 *
1311 		 * This is supported by two various mechanisms in the
1312 		 * individual modules.  However, from the application's
1313 		 * point of view, the template user is always passed
1314 		 * back as a changed value of the PAM_USER item.
1315 		 */
1316 		if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1317 		    PAM_SUCCESS) {
1318 			tmpl_user = (const char *) item;
1319 			if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1320 				*ppw = getpwnam(tmpl_user);
1321 		} else
1322 			syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1323 			    pam_strerror(pamh, e));
1324 		rval = 0;
1325 		break;
1326 
1327 	case PAM_AUTH_ERR:
1328 	case PAM_USER_UNKNOWN:
1329 	case PAM_MAXTRIES:
1330 		rval = 1;
1331 		break;
1332 
1333 	default:
1334 		syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
1335 		rval = -1;
1336 		break;
1337 	}
1338 
1339 	if (rval == 0) {
1340 		e = pam_acct_mgmt(pamh, 0);
1341 		if (e != PAM_SUCCESS) {
1342 			syslog(LOG_ERR, "pam_acct_mgmt: %s",
1343 						pam_strerror(pamh, e));
1344 			rval = 1;
1345 		}
1346 	}
1347 
1348 	if (rval != 0) {
1349 		if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1350 			syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1351 		}
1352 		pamh = NULL;
1353 	}
1354 	return rval;
1355 }
1356 
1357 #endif /* USE_PAM */
1358 
1359 void
1360 pass(char *passwd)
1361 {
1362 	int rval;
1363 	FILE *fd;
1364 #ifdef	LOGIN_CAP
1365 	login_cap_t *lc = NULL;
1366 #endif
1367 #ifdef USE_PAM
1368 	int e;
1369 #endif
1370 	char *residue = NULL;
1371 	char *xpasswd;
1372 
1373 	if (logged_in || askpasswd == 0) {
1374 		reply(503, "Login with USER first.");
1375 		return;
1376 	}
1377 	askpasswd = 0;
1378 	if (!guest) {		/* "ftp" is only account allowed no password */
1379 		if (pw == NULL) {
1380 			rval = 1;	/* failure below */
1381 			goto skip;
1382 		}
1383 #ifdef USE_PAM
1384 		rval = auth_pam(&pw, passwd);
1385 		if (rval >= 0) {
1386 			opieunlock();
1387 			goto skip;
1388 		}
1389 #endif
1390 		if (opieverify(&opiedata, passwd) == 0)
1391 			xpasswd = pw->pw_passwd;
1392 		else if (pwok) {
1393 			xpasswd = crypt(passwd, pw->pw_passwd);
1394 			if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
1395 				xpasswd = ":";
1396 		} else {
1397 			rval = 1;
1398 			goto skip;
1399 		}
1400 		rval = strcmp(pw->pw_passwd, xpasswd);
1401 		if (pw->pw_expire && time(NULL) >= pw->pw_expire)
1402 			rval = 1;	/* failure */
1403 skip:
1404 		/*
1405 		 * If rval == 1, the user failed the authentication check
1406 		 * above.  If rval == 0, either PAM or local authentication
1407 		 * succeeded.
1408 		 */
1409 		if (rval) {
1410 			reply(530, "Login incorrect.");
1411 			if (logging) {
1412 				syslog(LOG_NOTICE,
1413 				    "FTP LOGIN FAILED FROM %s",
1414 				    remotehost);
1415 				syslog(LOG_AUTHPRIV | LOG_NOTICE,
1416 				    "FTP LOGIN FAILED FROM %s, %s",
1417 				    remotehost, curname);
1418 			}
1419 			pw = NULL;
1420 			if (login_attempts++ >= 5) {
1421 				syslog(LOG_NOTICE,
1422 				    "repeated login failures from %s",
1423 				    remotehost);
1424 				exit(0);
1425 			}
1426 			return;
1427 		}
1428 	}
1429 	login_attempts = 0;		/* this time successful */
1430 	if (setegid(pw->pw_gid) < 0) {
1431 		reply(550, "Can't set gid.");
1432 		return;
1433 	}
1434 	/* May be overridden by login.conf */
1435 	(void) umask(defumask);
1436 #ifdef	LOGIN_CAP
1437 	if ((lc = login_getpwclass(pw)) != NULL) {
1438 		char	remote_ip[NI_MAXHOST];
1439 
1440 		if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
1441 			remote_ip, sizeof(remote_ip) - 1, NULL, 0,
1442 			NI_NUMERICHOST))
1443 				*remote_ip = 0;
1444 		remote_ip[sizeof(remote_ip) - 1] = 0;
1445 		if (!auth_hostok(lc, remotehost, remote_ip)) {
1446 			syslog(LOG_INFO|LOG_AUTH,
1447 			    "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1448 			    pw->pw_name);
1449 			reply(530, "Permission denied.");
1450 			pw = NULL;
1451 			return;
1452 		}
1453 		if (!auth_timeok(lc, time(NULL))) {
1454 			reply(530, "Login not available right now.");
1455 			pw = NULL;
1456 			return;
1457 		}
1458 	}
1459 	setusercontext(lc, pw, 0,
1460 		LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1461 		LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC);
1462 #else
1463 	setlogin(pw->pw_name);
1464 	(void) initgroups(pw->pw_name, pw->pw_gid);
1465 #endif
1466 
1467 #ifdef USE_PAM
1468 	if (pamh) {
1469 		if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
1470 			syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
1471 		} else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
1472 			syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1473 		}
1474 	}
1475 #endif
1476 
1477 	/* open wtmp before chroot */
1478 	if (dowtmp)
1479 		ftpd_logwtmp(ttyline, pw->pw_name,
1480 		    (struct sockaddr *)&his_addr);
1481 	logged_in = 1;
1482 
1483 	if (guest && stats && statfd < 0)
1484 #ifdef VIRTUAL_HOSTING
1485 		statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
1486 #else
1487 		statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
1488 #endif
1489 		if (statfd < 0)
1490 			stats = 0;
1491 
1492 	dochroot =
1493 		checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
1494 #ifdef	LOGIN_CAP	/* Allow login.conf configuration as well */
1495 		|| login_getcapbool(lc, "ftp-chroot", 0)
1496 #endif
1497 	;
1498 	chrootdir = NULL;
1499 	/*
1500 	 * For a chrooted local user,
1501 	 * a) see whether ftpchroot(5) specifies a chroot directory,
1502 	 * b) extract the directory pathname from the line,
1503 	 * c) expand it to the absolute pathname if necessary.
1504 	 */
1505 	if (dochroot && residue &&
1506 	    (chrootdir = strtok(residue, " \t")) != NULL) {
1507 		if (chrootdir[0] != '/')
1508 			asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1509 		else
1510 			chrootdir = strdup(chrootdir); /* make it permanent */
1511 		if (chrootdir == NULL)
1512 			fatalerror("Ran out of memory.");
1513 	}
1514 	if (guest || dochroot) {
1515 		/*
1516 		 * If no chroot directory set yet, use the login directory.
1517 		 * Copy it so it can be modified while pw->pw_dir stays intact.
1518 		 */
1519 		if (chrootdir == NULL &&
1520 		    (chrootdir = strdup(pw->pw_dir)) == NULL)
1521 			fatalerror("Ran out of memory.");
1522 		/*
1523 		 * Check for the "/chroot/./home" syntax,
1524 		 * separate the chroot and home directory pathnames.
1525 		 */
1526 		if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1527 			*(homedir++) = '\0';	/* wipe '/' */
1528 			homedir++;		/* skip '.' */
1529 		} else {
1530 			/*
1531 			 * We MUST do a chdir() after the chroot. Otherwise
1532 			 * the old current directory will be accessible as "."
1533 			 * outside the new root!
1534 			 */
1535 			homedir = "/";
1536 		}
1537 		/*
1538 		 * Finally, do chroot()
1539 		 */
1540 		if (chroot(chrootdir) < 0) {
1541 			reply(550, "Can't change root.");
1542 			goto bad;
1543 		}
1544 	} else	/* real user w/o chroot */
1545 		homedir = pw->pw_dir;
1546 	/*
1547 	 * Set euid *before* doing chdir() so
1548 	 * a) the user won't be carried to a directory that he couldn't reach
1549 	 *    on his own due to no permission to upper path components,
1550 	 * b) NFS mounted homedirs w/restrictive permissions will be accessible
1551 	 *    (uid 0 has no root power over NFS if not mapped explicitly.)
1552 	 */
1553 	if (seteuid(pw->pw_uid) < 0) {
1554 		reply(550, "Can't set uid.");
1555 		goto bad;
1556 	}
1557 	if (chdir(homedir) < 0) {
1558 		if (guest || dochroot) {
1559 			reply(550, "Can't change to base directory.");
1560 			goto bad;
1561 		} else {
1562 			if (chdir("/") < 0) {
1563 				reply(550, "Root is inaccessible.");
1564 				goto bad;
1565 			}
1566 			lreply(230, "No directory! Logging in with home=/.");
1567 		}
1568 	}
1569 
1570 	/*
1571 	 * Display a login message, if it exists.
1572 	 * N.B. reply(230,) must follow the message.
1573 	 */
1574 #ifdef VIRTUAL_HOSTING
1575 	fd = fopen(thishost->loginmsg, "r");
1576 #else
1577 	fd = fopen(_PATH_FTPLOGINMESG, "r");
1578 #endif
1579 	if (fd != NULL) {
1580 		char *cp, line[LINE_MAX];
1581 
1582 		while (fgets(line, sizeof(line), fd) != NULL) {
1583 			if ((cp = strchr(line, '\n')) != NULL)
1584 				*cp = '\0';
1585 			lreply(230, "%s", line);
1586 		}
1587 		(void) fflush(stdout);
1588 		(void) fclose(fd);
1589 	}
1590 	if (guest) {
1591 		if (ident != NULL)
1592 			free(ident);
1593 		ident = strdup(passwd);
1594 		if (ident == NULL)
1595 			fatalerror("Ran out of memory.");
1596 
1597 		reply(230, "Guest login ok, access restrictions apply.");
1598 #ifdef SETPROCTITLE
1599 #ifdef VIRTUAL_HOSTING
1600 		if (thishost != firsthost)
1601 			snprintf(proctitle, sizeof(proctitle),
1602 				 "%s: anonymous(%s)/%s", remotehost, hostname,
1603 				 passwd);
1604 		else
1605 #endif
1606 			snprintf(proctitle, sizeof(proctitle),
1607 				 "%s: anonymous/%s", remotehost, passwd);
1608 		setproctitle("%s", proctitle);
1609 #endif /* SETPROCTITLE */
1610 		if (logging)
1611 			syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1612 			    remotehost, passwd);
1613 	} else {
1614 		if (dochroot)
1615 			reply(230, "User %s logged in, "
1616 				   "access restrictions apply.", pw->pw_name);
1617 		else
1618 			reply(230, "User %s logged in.", pw->pw_name);
1619 
1620 #ifdef SETPROCTITLE
1621 		snprintf(proctitle, sizeof(proctitle),
1622 			 "%s: user/%s", remotehost, pw->pw_name);
1623 		setproctitle("%s", proctitle);
1624 #endif /* SETPROCTITLE */
1625 		if (logging)
1626 			syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1627 			    remotehost, pw->pw_name);
1628 	}
1629 	if (logging && (guest || dochroot))
1630 		syslog(LOG_INFO, "session root changed to %s", chrootdir);
1631 #ifdef	LOGIN_CAP
1632 	login_close(lc);
1633 #endif
1634 	if (residue)
1635 		free(residue);
1636 	return;
1637 bad:
1638 	/* Forget all about it... */
1639 #ifdef	LOGIN_CAP
1640 	login_close(lc);
1641 #endif
1642 	if (residue)
1643 		free(residue);
1644 	end_login();
1645 }
1646 
1647 void
1648 retrieve(char *cmd, char *name)
1649 {
1650 	FILE *fin, *dout;
1651 	struct stat st;
1652 	int (*closefunc)(FILE *);
1653 	time_t start;
1654 
1655 	if (cmd == 0) {
1656 		fin = fopen(name, "r"), closefunc = fclose;
1657 		st.st_size = 0;
1658 	} else {
1659 		char line[BUFSIZ];
1660 
1661 		(void) snprintf(line, sizeof(line), cmd, name), name = line;
1662 		fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1663 		st.st_size = -1;
1664 		st.st_blksize = BUFSIZ;
1665 	}
1666 	if (fin == NULL) {
1667 		if (errno != 0) {
1668 			perror_reply(550, name);
1669 			if (cmd == 0) {
1670 				LOGCMD("get", name);
1671 			}
1672 		}
1673 		return;
1674 	}
1675 	byte_count = -1;
1676 	if (cmd == 0) {
1677 		if (fstat(fileno(fin), &st) < 0) {
1678 			perror_reply(550, name);
1679 			goto done;
1680 		}
1681 		if (!S_ISREG(st.st_mode)) {
1682 			/*
1683 			 * Never sending a raw directory is a workaround
1684 			 * for buggy clients that will attempt to RETR
1685 			 * a directory before listing it, e.g., Mozilla.
1686 			 * Preventing a guest from getting irregular files
1687 			 * is a simple security measure.
1688 			 */
1689 			if (S_ISDIR(st.st_mode) || guest) {
1690 				reply(550, "%s: not a plain file.", name);
1691 				goto done;
1692 			}
1693 			st.st_size = -1;
1694 			/* st.st_blksize is set for all descriptor types */
1695 		}
1696 	}
1697 	if (restart_point) {
1698 		if (type == TYPE_A) {
1699 			off_t i, n;
1700 			int c;
1701 
1702 			n = restart_point;
1703 			i = 0;
1704 			while (i++ < n) {
1705 				if ((c=getc(fin)) == EOF) {
1706 					perror_reply(550, name);
1707 					goto done;
1708 				}
1709 				if (c == '\n')
1710 					i++;
1711 			}
1712 		} else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1713 			perror_reply(550, name);
1714 			goto done;
1715 		}
1716 	}
1717 	dout = dataconn(name, st.st_size, "w");
1718 	if (dout == NULL)
1719 		goto done;
1720 	time(&start);
1721 	send_data(fin, dout, st.st_blksize, st.st_size,
1722 		  restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
1723 	if (cmd == 0 && guest && stats && byte_count > 0)
1724 		logxfer(name, byte_count, start);
1725 	(void) fclose(dout);
1726 	data = -1;
1727 	pdata = -1;
1728 done:
1729 	if (cmd == 0)
1730 		LOGBYTES("get", name, byte_count);
1731 	(*closefunc)(fin);
1732 }
1733 
1734 void
1735 store(char *name, char *mode, int unique)
1736 {
1737 	int fd;
1738 	FILE *fout, *din;
1739 	int (*closefunc)(FILE *);
1740 
1741 	if (*mode == 'a') {		/* APPE */
1742 		if (unique) {
1743 			/* Programming error */
1744 			syslog(LOG_ERR, "Internal: unique flag to APPE");
1745 			unique = 0;
1746 		}
1747 		if (guest && noguestmod) {
1748 			reply(550, "Appending to existing file denied.");
1749 			goto err;
1750 		}
1751 		restart_point = 0;	/* not affected by preceding REST */
1752 	}
1753 	if (unique)			/* STOU overrides REST */
1754 		restart_point = 0;
1755 	if (guest && noguestmod) {
1756 		if (restart_point) {	/* guest STOR w/REST */
1757 			reply(550, "Modifying existing file denied.");
1758 			goto err;
1759 		} else			/* treat guest STOR as STOU */
1760 			unique = 1;
1761 	}
1762 
1763 	if (restart_point)
1764 		mode = "r+";	/* so ASCII manual seek can work */
1765 	if (unique) {
1766 		if ((fd = guniquefd(name, &name)) < 0)
1767 			goto err;
1768 		fout = fdopen(fd, mode);
1769 	} else
1770 		fout = fopen(name, mode);
1771 	closefunc = fclose;
1772 	if (fout == NULL) {
1773 		perror_reply(553, name);
1774 		goto err;
1775 	}
1776 	byte_count = -1;
1777 	if (restart_point) {
1778 		if (type == TYPE_A) {
1779 			off_t i, n;
1780 			int c;
1781 
1782 			n = restart_point;
1783 			i = 0;
1784 			while (i++ < n) {
1785 				if ((c=getc(fout)) == EOF) {
1786 					perror_reply(550, name);
1787 					goto done;
1788 				}
1789 				if (c == '\n')
1790 					i++;
1791 			}
1792 			/*
1793 			 * We must do this seek to "current" position
1794 			 * because we are changing from reading to
1795 			 * writing.
1796 			 */
1797 			if (fseeko(fout, 0, SEEK_CUR) < 0) {
1798 				perror_reply(550, name);
1799 				goto done;
1800 			}
1801 		} else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1802 			perror_reply(550, name);
1803 			goto done;
1804 		}
1805 	}
1806 	din = dataconn(name, -1, "r");
1807 	if (din == NULL)
1808 		goto done;
1809 	if (receive_data(din, fout) == 0) {
1810 		if (unique)
1811 			reply(226, "Transfer complete (unique file name:%s).",
1812 			    name);
1813 		else
1814 			reply(226, "Transfer complete.");
1815 	}
1816 	(void) fclose(din);
1817 	data = -1;
1818 	pdata = -1;
1819 done:
1820 	LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1821 	(*closefunc)(fout);
1822 	return;
1823 err:
1824 	LOGCMD(*mode == 'a' ? "append" : "put" , name);
1825 	return;
1826 }
1827 
1828 static FILE *
1829 getdatasock(char *mode)
1830 {
1831 	int on = 1, s, t, tries;
1832 
1833 	if (data >= 0)
1834 		return (fdopen(data, mode));
1835 
1836 	s = socket(data_dest.su_family, SOCK_STREAM, 0);
1837 	if (s < 0)
1838 		goto bad;
1839 	if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1840 		syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1841 	/* anchor socket to avoid multi-homing problems */
1842 	data_source = ctrl_addr;
1843 	data_source.su_port = htons(dataport);
1844 	(void) seteuid(0);
1845 	for (tries = 1; ; tries++) {
1846 		/*
1847 		 * We should loop here since it's possible that
1848 		 * another ftpd instance has passed this point and is
1849 		 * trying to open a data connection in active mode now.
1850 		 * Until the other connection is opened, we'll be getting
1851 		 * EADDRINUSE because no SOCK_STREAM sockets in the system
1852 		 * can share both local and remote addresses, localIP:20
1853 		 * and *:* in this case.
1854 		 */
1855 		if (bind(s, (struct sockaddr *)&data_source,
1856 		    data_source.su_len) >= 0)
1857 			break;
1858 		if (errno != EADDRINUSE || tries > 10)
1859 			goto bad;
1860 		sleep(tries);
1861 	}
1862 	(void) seteuid(pw->pw_uid);
1863 #ifdef IP_TOS
1864 	if (data_source.su_family == AF_INET)
1865       {
1866 	on = IPTOS_THROUGHPUT;
1867 	if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1868 		syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1869       }
1870 #endif
1871 #ifdef TCP_NOPUSH
1872 	/*
1873 	 * Turn off push flag to keep sender TCP from sending short packets
1874 	 * at the boundaries of each write().  Should probably do a SO_SNDBUF
1875 	 * to set the send buffer size as well, but that may not be desirable
1876 	 * in heavy-load situations.
1877 	 */
1878 	on = 1;
1879 	if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1880 		syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1881 #endif
1882 #ifdef SO_SNDBUF
1883 	on = 65536;
1884 	if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0)
1885 		syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m");
1886 #endif
1887 
1888 	return (fdopen(s, mode));
1889 bad:
1890 	/* Return the real value of errno (close may change it) */
1891 	t = errno;
1892 	(void) seteuid(pw->pw_uid);
1893 	(void) close(s);
1894 	errno = t;
1895 	return (NULL);
1896 }
1897 
1898 static FILE *
1899 dataconn(char *name, off_t size, char *mode)
1900 {
1901 	char sizebuf[32];
1902 	FILE *file;
1903 	int retry = 0, tos, conerrno;
1904 
1905 	file_size = size;
1906 	byte_count = 0;
1907 	if (size != -1)
1908 		(void) snprintf(sizebuf, sizeof(sizebuf),
1909 				" (%jd bytes)", (intmax_t)size);
1910 	else
1911 		*sizebuf = '\0';
1912 	if (pdata >= 0) {
1913 		union sockunion from;
1914 		socklen_t fromlen = ctrl_addr.su_len;
1915 		int flags, s;
1916 		struct timeval timeout;
1917 		fd_set set;
1918 
1919 		FD_ZERO(&set);
1920 		FD_SET(pdata, &set);
1921 
1922 		timeout.tv_usec = 0;
1923 		timeout.tv_sec = 120;
1924 
1925 		/*
1926 		 * Granted a socket is in the blocking I/O mode,
1927 		 * accept() will block after a successful select()
1928 		 * if the selected connection dies in between.
1929 		 * Therefore set the non-blocking I/O flag here.
1930 		 */
1931 		if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1932 		    fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1933 			goto pdata_err;
1934 		if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
1935 		    (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1936 			goto pdata_err;
1937 		(void) close(pdata);
1938 		pdata = s;
1939 		/*
1940 		 * Unset the inherited non-blocking I/O flag
1941 		 * on the child socket so stdio can work on it.
1942 		 */
1943 		if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1944 		    fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
1945 			goto pdata_err;
1946 #ifdef IP_TOS
1947 		if (from.su_family == AF_INET)
1948 	      {
1949 		tos = IPTOS_THROUGHPUT;
1950 		if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
1951 			syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
1952 	      }
1953 #endif
1954 		reply(150, "Opening %s mode data connection for '%s'%s.",
1955 		     type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1956 		return (fdopen(pdata, mode));
1957 pdata_err:
1958 		reply(425, "Can't open data connection.");
1959 		(void) close(pdata);
1960 		pdata = -1;
1961 		return (NULL);
1962 	}
1963 	if (data >= 0) {
1964 		reply(125, "Using existing data connection for '%s'%s.",
1965 		    name, sizebuf);
1966 		usedefault = 1;
1967 		return (fdopen(data, mode));
1968 	}
1969 	if (usedefault)
1970 		data_dest = his_addr;
1971 	usedefault = 1;
1972 	do {
1973 		file = getdatasock(mode);
1974 		if (file == NULL) {
1975 			char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];
1976 
1977 			if (getnameinfo((struct sockaddr *)&data_source,
1978 				data_source.su_len,
1979 				hostbuf, sizeof(hostbuf) - 1,
1980 				portbuf, sizeof(portbuf) - 1,
1981 				NI_NUMERICHOST|NI_NUMERICSERV))
1982 					*hostbuf = *portbuf = 0;
1983 			hostbuf[sizeof(hostbuf) - 1] = 0;
1984 			portbuf[sizeof(portbuf) - 1] = 0;
1985 			reply(425, "Can't create data socket (%s,%s): %s.",
1986 				hostbuf, portbuf, strerror(errno));
1987 			return (NULL);
1988 		}
1989 		data = fileno(file);
1990 		conerrno = 0;
1991 		if (connect(data, (struct sockaddr *)&data_dest,
1992 		    data_dest.su_len) == 0)
1993 			break;
1994 		conerrno = errno;
1995 		(void) fclose(file);
1996 		data = -1;
1997 		if (conerrno == EADDRINUSE) {
1998 			sleep(swaitint);
1999 			retry += swaitint;
2000 		} else {
2001 			break;
2002 		}
2003 	} while (retry <= swaitmax);
2004 	if (conerrno != 0) {
2005 		reply(425, "Can't build data connection: %s.",
2006 			   strerror(conerrno));
2007 		return (NULL);
2008 	}
2009 	reply(150, "Opening %s mode data connection for '%s'%s.",
2010 	     type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
2011 	return (file);
2012 }
2013 
2014 /*
2015  * A helper macro to avoid code duplication
2016  * in send_data() and receive_data().
2017  *
2018  * XXX We have to block SIGURG during putc() because BSD stdio
2019  * is unable to restart interrupted write operations and hence
2020  * the entire buffer contents will be lost as soon as a write()
2021  * call indicates EINTR to stdio.
2022  */
2023 #define FTPD_PUTC(ch, file, label)					\
2024 	do {								\
2025 		int ret;						\
2026 									\
2027 		do {							\
2028 			START_UNSAFE;					\
2029 			ret = putc((ch), (file));			\
2030 			END_UNSAFE;					\
2031 			CHECKOOB(return (-1))				\
2032 			else if (ferror(file))				\
2033 				goto label;				\
2034 			clearerr(file);					\
2035 		} while (ret == EOF);					\
2036 	} while (0)
2037 
2038 /*
2039  * Tranfer the contents of "instr" to "outstr" peer using the appropriate
2040  * encapsulation of the data subject to Mode, Structure, and Type.
2041  *
2042  * NB: Form isn't handled.
2043  */
2044 static int
2045 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
2046 {
2047 	int c, cp, filefd, netfd;
2048 	char *buf;
2049 
2050 	STARTXFER;
2051 
2052 	switch (type) {
2053 
2054 	case TYPE_A:
2055 		cp = EOF;
2056 		for (;;) {
2057 			c = getc(instr);
2058 			CHECKOOB(return (-1))
2059 			else if (c == EOF && ferror(instr))
2060 				goto file_err;
2061 			if (c == EOF) {
2062 				if (ferror(instr)) {	/* resume after OOB */
2063 					clearerr(instr);
2064 					continue;
2065 				}
2066 				if (feof(instr))	/* EOF */
2067 					break;
2068 				syslog(LOG_ERR, "Internal: impossible condition"
2069 						" on file after getc()");
2070 				goto file_err;
2071 			}
2072 			if (c == '\n' && cp != '\r') {
2073 				FTPD_PUTC('\r', outstr, data_err);
2074 				byte_count++;
2075 			}
2076 			FTPD_PUTC(c, outstr, data_err);
2077 			byte_count++;
2078 			cp = c;
2079 		}
2080 #ifdef notyet	/* BSD stdio isn't ready for that */
2081 		while (fflush(outstr) == EOF) {
2082 			CHECKOOB(return (-1))
2083 			else
2084 				goto data_err;
2085 			clearerr(outstr);
2086 		}
2087 		ENDXFER;
2088 #else
2089 		ENDXFER;
2090 		if (fflush(outstr) == EOF)
2091 			goto data_err;
2092 #endif
2093 		reply(226, "Transfer complete.");
2094 		return (0);
2095 
2096 	case TYPE_I:
2097 	case TYPE_L:
2098 		/*
2099 		 * isreg is only set if we are not doing restart and we
2100 		 * are sending a regular file
2101 		 */
2102 		netfd = fileno(outstr);
2103 		filefd = fileno(instr);
2104 
2105 		if (isreg) {
2106 			char *msg = "Transfer complete.";
2107 			off_t cnt, offset;
2108 			int err;
2109 
2110 			cnt = offset = 0;
2111 
2112 			while (filesize > 0) {
2113 				err = sendfile(filefd, netfd, offset, 0,
2114 					       NULL, &cnt, 0);
2115 				/*
2116 				 * Calculate byte_count before OOB processing.
2117 				 * It can be used in myoob() later.
2118 				 */
2119 				byte_count += cnt;
2120 				offset += cnt;
2121 				filesize -= cnt;
2122 				CHECKOOB(return (-1))
2123 				else if (err == -1) {
2124 					if (errno != EINTR &&
2125 					    cnt == 0 && offset == 0)
2126 						goto oldway;
2127 					goto data_err;
2128 				}
2129 				if (err == -1)	/* resume after OOB */
2130 					continue;
2131 				/*
2132 				 * We hit the EOF prematurely.
2133 				 * Perhaps the file was externally truncated.
2134 				 */
2135 				if (cnt == 0) {
2136 					msg = "Transfer finished due to "
2137 					      "premature end of file.";
2138 					break;
2139 				}
2140 			}
2141 			ENDXFER;
2142 			reply(226, msg);
2143 			return (0);
2144 		}
2145 
2146 oldway:
2147 		if ((buf = malloc(blksize)) == NULL) {
2148 			ENDXFER;
2149 			reply(451, "Ran out of memory.");
2150 			return (-1);
2151 		}
2152 
2153 		for (;;) {
2154 			int cnt, len;
2155 			char *bp;
2156 
2157 			cnt = read(filefd, buf, blksize);
2158 			CHECKOOB(free(buf); return (-1))
2159 			else if (cnt < 0) {
2160 				free(buf);
2161 				goto file_err;
2162 			}
2163 			if (cnt < 0)	/* resume after OOB */
2164 				continue;
2165 			if (cnt == 0)	/* EOF */
2166 				break;
2167 			for (len = cnt, bp = buf; len > 0;) {
2168 				cnt = write(netfd, bp, len);
2169 				CHECKOOB(free(buf); return (-1))
2170 				else if (cnt < 0) {
2171 					free(buf);
2172 					goto data_err;
2173 				}
2174 				if (cnt <= 0)
2175 					continue;
2176 				len -= cnt;
2177 				bp += cnt;
2178 				byte_count += cnt;
2179 			}
2180 		}
2181 		ENDXFER;
2182 		free(buf);
2183 		reply(226, "Transfer complete.");
2184 		return (0);
2185 	default:
2186 		ENDXFER;
2187 		reply(550, "Unimplemented TYPE %d in send_data.", type);
2188 		return (-1);
2189 	}
2190 
2191 data_err:
2192 	ENDXFER;
2193 	perror_reply(426, "Data connection");
2194 	return (-1);
2195 
2196 file_err:
2197 	ENDXFER;
2198 	perror_reply(551, "Error on input file");
2199 	return (-1);
2200 }
2201 
2202 /*
2203  * Transfer data from peer to "outstr" using the appropriate encapulation of
2204  * the data subject to Mode, Structure, and Type.
2205  *
2206  * N.B.: Form isn't handled.
2207  */
2208 static int
2209 receive_data(FILE *instr, FILE *outstr)
2210 {
2211 	int c, cp;
2212 	int bare_lfs = 0;
2213 
2214 	STARTXFER;
2215 
2216 	switch (type) {
2217 
2218 	case TYPE_I:
2219 	case TYPE_L:
2220 		for (;;) {
2221 			int cnt, len;
2222 			char *bp;
2223 			char buf[BUFSIZ];
2224 
2225 			cnt = read(fileno(instr), buf, sizeof(buf));
2226 			CHECKOOB(return (-1))
2227 			else if (cnt < 0)
2228 				goto data_err;
2229 			if (cnt < 0)	/* resume after OOB */
2230 				continue;
2231 			if (cnt == 0)	/* EOF */
2232 				break;
2233 			for (len = cnt, bp = buf; len > 0;) {
2234 				cnt = write(fileno(outstr), bp, len);
2235 				CHECKOOB(return (-1))
2236 				else if (cnt < 0)
2237 					goto file_err;
2238 				if (cnt <= 0)
2239 					continue;
2240 				len -= cnt;
2241 				bp += cnt;
2242 				byte_count += cnt;
2243 			}
2244 		}
2245 		ENDXFER;
2246 		return (0);
2247 
2248 	case TYPE_E:
2249 		ENDXFER;
2250 		reply(553, "TYPE E not implemented.");
2251 		return (-1);
2252 
2253 	case TYPE_A:
2254 		cp = EOF;
2255 		for (;;) {
2256 			c = getc(instr);
2257 			CHECKOOB(return (-1))
2258 			else if (c == EOF && ferror(instr))
2259 				goto data_err;
2260 			if (c == EOF && ferror(instr)) { /* resume after OOB */
2261 				clearerr(instr);
2262 				continue;
2263 			}
2264 
2265 			if (cp == '\r') {
2266 				if (c != '\n')
2267 					FTPD_PUTC('\r', outstr, file_err);
2268 			} else
2269 				if (c == '\n')
2270 					bare_lfs++;
2271 			if (c == '\r') {
2272 				byte_count++;
2273 				cp = c;
2274 				continue;
2275 			}
2276 
2277 			/* Check for EOF here in order not to lose last \r. */
2278 			if (c == EOF) {
2279 				if (feof(instr))	/* EOF */
2280 					break;
2281 				syslog(LOG_ERR, "Internal: impossible condition"
2282 						" on data stream after getc()");
2283 				goto data_err;
2284 			}
2285 
2286 			byte_count++;
2287 			FTPD_PUTC(c, outstr, file_err);
2288 			cp = c;
2289 		}
2290 #ifdef notyet	/* BSD stdio isn't ready for that */
2291 		while (fflush(outstr) == EOF) {
2292 			CHECKOOB(return (-1))
2293 			else
2294 				goto file_err;
2295 			clearerr(outstr);
2296 		}
2297 		ENDXFER;
2298 #else
2299 		ENDXFER;
2300 		if (fflush(outstr) == EOF)
2301 			goto file_err;
2302 #endif
2303 		if (bare_lfs) {
2304 			lreply(226,
2305 		"WARNING! %d bare linefeeds received in ASCII mode.",
2306 			    bare_lfs);
2307 		(void)printf("   File may not have transferred correctly.\r\n");
2308 		}
2309 		return (0);
2310 	default:
2311 		ENDXFER;
2312 		reply(550, "Unimplemented TYPE %d in receive_data.", type);
2313 		return (-1);
2314 	}
2315 
2316 data_err:
2317 	ENDXFER;
2318 	perror_reply(426, "Data connection");
2319 	return (-1);
2320 
2321 file_err:
2322 	ENDXFER;
2323 	perror_reply(452, "Error writing to file");
2324 	return (-1);
2325 }
2326 
2327 void
2328 statfilecmd(char *filename)
2329 {
2330 	FILE *fin;
2331 	int atstart;
2332 	int c, code;
2333 	char line[LINE_MAX];
2334 	struct stat st;
2335 
2336 	code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
2337 	(void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
2338 	fin = ftpd_popen(line, "r");
2339 	lreply(code, "Status of %s:", filename);
2340 	atstart = 1;
2341 	while ((c = getc(fin)) != EOF) {
2342 		if (c == '\n') {
2343 			if (ferror(stdout)){
2344 				perror_reply(421, "Control connection");
2345 				(void) ftpd_pclose(fin);
2346 				dologout(1);
2347 				/* NOTREACHED */
2348 			}
2349 			if (ferror(fin)) {
2350 				perror_reply(551, filename);
2351 				(void) ftpd_pclose(fin);
2352 				return;
2353 			}
2354 			(void) putc('\r', stdout);
2355 		}
2356 		/*
2357 		 * RFC 959 says neutral text should be prepended before
2358 		 * a leading 3-digit number followed by whitespace, but
2359 		 * many ftp clients can be confused by any leading digits,
2360 		 * as a matter of fact.
2361 		 */
2362 		if (atstart && isdigit(c))
2363 			(void) putc(' ', stdout);
2364 		(void) putc(c, stdout);
2365 		atstart = (c == '\n');
2366 	}
2367 	(void) ftpd_pclose(fin);
2368 	reply(code, "End of status.");
2369 }
2370 
2371 void
2372 statcmd(void)
2373 {
2374 	union sockunion *su;
2375 	u_char *a, *p;
2376 	char hname[NI_MAXHOST];
2377 	int ispassive;
2378 
2379 	if (hostinfo) {
2380 		lreply(211, "%s FTP server status:", hostname);
2381 		printf("     %s\r\n", version);
2382 	} else
2383 		lreply(211, "FTP server status:");
2384 	printf("     Connected to %s", remotehost);
2385 	if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2386 			 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
2387 		hname[sizeof(hname) - 1] = 0;
2388 		if (strcmp(hname, remotehost) != 0)
2389 			printf(" (%s)", hname);
2390 	}
2391 	printf("\r\n");
2392 	if (logged_in) {
2393 		if (guest)
2394 			printf("     Logged in anonymously\r\n");
2395 		else
2396 			printf("     Logged in as %s\r\n", pw->pw_name);
2397 	} else if (askpasswd)
2398 		printf("     Waiting for password\r\n");
2399 	else
2400 		printf("     Waiting for user name\r\n");
2401 	printf("     TYPE: %s", typenames[type]);
2402 	if (type == TYPE_A || type == TYPE_E)
2403 		printf(", FORM: %s", formnames[form]);
2404 	if (type == TYPE_L)
2405 #if CHAR_BIT == 8
2406 		printf(" %d", CHAR_BIT);
2407 #else
2408 		printf(" %d", bytesize);	/* need definition! */
2409 #endif
2410 	printf("; STRUcture: %s; transfer MODE: %s\r\n",
2411 	    strunames[stru], modenames[mode]);
2412 	if (data != -1)
2413 		printf("     Data connection open\r\n");
2414 	else if (pdata != -1) {
2415 		ispassive = 1;
2416 		su = &pasv_addr;
2417 		goto printaddr;
2418 	} else if (usedefault == 0) {
2419 		ispassive = 0;
2420 		su = &data_dest;
2421 printaddr:
2422 #define UC(b) (((int) b) & 0xff)
2423 		if (epsvall) {
2424 			printf("     EPSV only mode (EPSV ALL)\r\n");
2425 			goto epsvonly;
2426 		}
2427 
2428 		/* PORT/PASV */
2429 		if (su->su_family == AF_INET) {
2430 			a = (u_char *) &su->su_sin.sin_addr;
2431 			p = (u_char *) &su->su_sin.sin_port;
2432 			printf("     %s (%d,%d,%d,%d,%d,%d)\r\n",
2433 				ispassive ? "PASV" : "PORT",
2434 				UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2435 				UC(p[0]), UC(p[1]));
2436 		}
2437 
2438 		/* LPRT/LPSV */
2439 	    {
2440 		int alen, af, i;
2441 
2442 		switch (su->su_family) {
2443 		case AF_INET:
2444 			a = (u_char *) &su->su_sin.sin_addr;
2445 			p = (u_char *) &su->su_sin.sin_port;
2446 			alen = sizeof(su->su_sin.sin_addr);
2447 			af = 4;
2448 			break;
2449 		case AF_INET6:
2450 			a = (u_char *) &su->su_sin6.sin6_addr;
2451 			p = (u_char *) &su->su_sin6.sin6_port;
2452 			alen = sizeof(su->su_sin6.sin6_addr);
2453 			af = 6;
2454 			break;
2455 		default:
2456 			af = 0;
2457 			break;
2458 		}
2459 		if (af) {
2460 			printf("     %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2461 				af, alen);
2462 			for (i = 0; i < alen; i++)
2463 				printf("%d,", UC(a[i]));
2464 			printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2465 		}
2466 	    }
2467 
2468 epsvonly:;
2469 		/* EPRT/EPSV */
2470 	    {
2471 		int af;
2472 
2473 		switch (su->su_family) {
2474 		case AF_INET:
2475 			af = 1;
2476 			break;
2477 		case AF_INET6:
2478 			af = 2;
2479 			break;
2480 		default:
2481 			af = 0;
2482 			break;
2483 		}
2484 		if (af) {
2485 			union sockunion tmp;
2486 
2487 			tmp = *su;
2488 			if (tmp.su_family == AF_INET6)
2489 				tmp.su_sin6.sin6_scope_id = 0;
2490 			if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2491 					hname, sizeof(hname) - 1, NULL, 0,
2492 					NI_NUMERICHOST)) {
2493 				hname[sizeof(hname) - 1] = 0;
2494 				printf("     %s |%d|%s|%d|\r\n",
2495 					ispassive ? "EPSV" : "EPRT",
2496 					af, hname, htons(tmp.su_port));
2497 			}
2498 		}
2499 	    }
2500 #undef UC
2501 	} else
2502 		printf("     No data connection\r\n");
2503 	reply(211, "End of status.");
2504 }
2505 
2506 void
2507 fatalerror(char *s)
2508 {
2509 
2510 	reply(451, "Error in server: %s", s);
2511 	reply(221, "Closing connection due to server error.");
2512 	dologout(0);
2513 	/* NOTREACHED */
2514 }
2515 
2516 void
2517 reply(int n, const char *fmt, ...)
2518 {
2519 	va_list ap;
2520 
2521 	(void)printf("%d ", n);
2522 	va_start(ap, fmt);
2523 	(void)vprintf(fmt, ap);
2524 	va_end(ap);
2525 	(void)printf("\r\n");
2526 	(void)fflush(stdout);
2527 	if (ftpdebug) {
2528 		syslog(LOG_DEBUG, "<--- %d ", n);
2529 		va_start(ap, fmt);
2530 		vsyslog(LOG_DEBUG, fmt, ap);
2531 		va_end(ap);
2532 	}
2533 }
2534 
2535 void
2536 lreply(int n, const char *fmt, ...)
2537 {
2538 	va_list ap;
2539 
2540 	(void)printf("%d- ", n);
2541 	va_start(ap, fmt);
2542 	(void)vprintf(fmt, ap);
2543 	va_end(ap);
2544 	(void)printf("\r\n");
2545 	(void)fflush(stdout);
2546 	if (ftpdebug) {
2547 		syslog(LOG_DEBUG, "<--- %d- ", n);
2548 		va_start(ap, fmt);
2549 		vsyslog(LOG_DEBUG, fmt, ap);
2550 		va_end(ap);
2551 	}
2552 }
2553 
2554 static void
2555 ack(char *s)
2556 {
2557 
2558 	reply(250, "%s command successful.", s);
2559 }
2560 
2561 void
2562 nack(char *s)
2563 {
2564 
2565 	reply(502, "%s command not implemented.", s);
2566 }
2567 
2568 /* ARGSUSED */
2569 void
2570 yyerror(char *s)
2571 {
2572 	char *cp;
2573 
2574 	if ((cp = strchr(cbuf,'\n')))
2575 		*cp = '\0';
2576 	reply(500, "%s: command not understood.", cbuf);
2577 }
2578 
2579 void
2580 delete(char *name)
2581 {
2582 	struct stat st;
2583 
2584 	LOGCMD("delete", name);
2585 	if (lstat(name, &st) < 0) {
2586 		perror_reply(550, name);
2587 		return;
2588 	}
2589 	if (S_ISDIR(st.st_mode)) {
2590 		if (rmdir(name) < 0) {
2591 			perror_reply(550, name);
2592 			return;
2593 		}
2594 		goto done;
2595 	}
2596 	if (guest && noguestmod) {
2597 		reply(550, "Operation not permitted.");
2598 		return;
2599 	}
2600 	if (unlink(name) < 0) {
2601 		perror_reply(550, name);
2602 		return;
2603 	}
2604 done:
2605 	ack("DELE");
2606 }
2607 
2608 void
2609 cwd(char *path)
2610 {
2611 
2612 	if (chdir(path) < 0)
2613 		perror_reply(550, path);
2614 	else
2615 		ack("CWD");
2616 }
2617 
2618 void
2619 makedir(char *name)
2620 {
2621 	char *s;
2622 
2623 	LOGCMD("mkdir", name);
2624 	if (guest && noguestmkd)
2625 		reply(550, "Operation not permitted.");
2626 	else if (mkdir(name, 0777) < 0)
2627 		perror_reply(550, name);
2628 	else {
2629 		if ((s = doublequote(name)) == NULL)
2630 			fatalerror("Ran out of memory.");
2631 		reply(257, "\"%s\" directory created.", s);
2632 		free(s);
2633 	}
2634 }
2635 
2636 void
2637 removedir(char *name)
2638 {
2639 
2640 	LOGCMD("rmdir", name);
2641 	if (rmdir(name) < 0)
2642 		perror_reply(550, name);
2643 	else
2644 		ack("RMD");
2645 }
2646 
2647 void
2648 pwd(void)
2649 {
2650 	char *s, path[MAXPATHLEN + 1];
2651 
2652 	if (getcwd(path, sizeof(path)) == NULL)
2653 		perror_reply(550, "Get current directory");
2654 	else {
2655 		if ((s = doublequote(path)) == NULL)
2656 			fatalerror("Ran out of memory.");
2657 		reply(257, "\"%s\" is current directory.", s);
2658 		free(s);
2659 	}
2660 }
2661 
2662 char *
2663 renamefrom(char *name)
2664 {
2665 	struct stat st;
2666 
2667 	if (guest && noguestmod) {
2668 		reply(550, "Operation not permitted.");
2669 		return (NULL);
2670 	}
2671 	if (lstat(name, &st) < 0) {
2672 		perror_reply(550, name);
2673 		return (NULL);
2674 	}
2675 	reply(350, "File exists, ready for destination name.");
2676 	return (name);
2677 }
2678 
2679 void
2680 renamecmd(char *from, char *to)
2681 {
2682 	struct stat st;
2683 
2684 	LOGCMD2("rename", from, to);
2685 
2686 	if (guest && (stat(to, &st) == 0)) {
2687 		reply(550, "%s: permission denied.", to);
2688 		return;
2689 	}
2690 
2691 	if (rename(from, to) < 0)
2692 		perror_reply(550, "rename");
2693 	else
2694 		ack("RNTO");
2695 }
2696 
2697 static void
2698 dolog(struct sockaddr *who)
2699 {
2700 	char who_name[NI_MAXHOST];
2701 
2702 	realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
2703 	remotehost[sizeof(remotehost) - 1] = 0;
2704 	if (getnameinfo(who, who->sa_len,
2705 		who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
2706 			*who_name = 0;
2707 	who_name[sizeof(who_name) - 1] = 0;
2708 
2709 #ifdef SETPROCTITLE
2710 #ifdef VIRTUAL_HOSTING
2711 	if (thishost != firsthost)
2712 		snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2713 			 remotehost, hostname);
2714 	else
2715 #endif
2716 		snprintf(proctitle, sizeof(proctitle), "%s: connected",
2717 			 remotehost);
2718 	setproctitle("%s", proctitle);
2719 #endif /* SETPROCTITLE */
2720 
2721 	if (logging) {
2722 #ifdef VIRTUAL_HOSTING
2723 		if (thishost != firsthost)
2724 			syslog(LOG_INFO, "connection from %s (%s) to %s",
2725 			       remotehost, who_name, hostname);
2726 		else
2727 #endif
2728 			syslog(LOG_INFO, "connection from %s (%s)",
2729 			       remotehost, who_name);
2730 	}
2731 }
2732 
2733 /*
2734  * Record logout in wtmp file
2735  * and exit with supplied status.
2736  */
2737 void
2738 dologout(int status)
2739 {
2740 
2741 	if (logged_in && dowtmp) {
2742 		(void) seteuid(0);
2743 		ftpd_logwtmp(ttyline, "", NULL);
2744 	}
2745 	/* beware of flushing buffers after a SIGPIPE */
2746 	_exit(status);
2747 }
2748 
2749 static void
2750 sigurg(int signo)
2751 {
2752 
2753 	recvurg = 1;
2754 }
2755 
2756 static void
2757 maskurg(int flag)
2758 {
2759 	int oerrno;
2760 	sigset_t sset;
2761 
2762 	if (!transflag) {
2763 		syslog(LOG_ERR, "Internal: maskurg() while no transfer");
2764 		return;
2765 	}
2766 	oerrno = errno;
2767 	sigemptyset(&sset);
2768 	sigaddset(&sset, SIGURG);
2769 	sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
2770 	errno = oerrno;
2771 }
2772 
2773 static void
2774 flagxfer(int flag)
2775 {
2776 
2777 	if (flag) {
2778 		if (transflag)
2779 			syslog(LOG_ERR, "Internal: flagxfer(1): "
2780 					"transfer already under way");
2781 		transflag = 1;
2782 		maskurg(0);
2783 		recvurg = 0;
2784 	} else {
2785 		if (!transflag)
2786 			syslog(LOG_ERR, "Internal: flagxfer(0): "
2787 					"no active transfer");
2788 		maskurg(1);
2789 		transflag = 0;
2790 	}
2791 }
2792 
2793 /*
2794  * Returns 0 if OK to resume or -1 if abort requested.
2795  */
2796 static int
2797 myoob(void)
2798 {
2799 	char *cp;
2800 
2801 	if (!transflag) {
2802 		syslog(LOG_ERR, "Internal: myoob() while no transfer");
2803 		return (0);
2804 	}
2805 	cp = tmpline;
2806 	if (getline(cp, 7, stdin) == NULL) {
2807 		reply(221, "You could at least say goodbye.");
2808 		dologout(0);
2809 	}
2810 	upper(cp);
2811 	if (strcmp(cp, "ABOR\r\n") == 0) {
2812 		tmpline[0] = '\0';
2813 		reply(426, "Transfer aborted. Data connection closed.");
2814 		reply(226, "Abort successful.");
2815 		return (-1);
2816 	}
2817 	if (strcmp(cp, "STAT\r\n") == 0) {
2818 		tmpline[0] = '\0';
2819 		if (file_size != -1)
2820 			reply(213, "Status: %jd of %jd bytes transferred.",
2821 				   (intmax_t)byte_count, (intmax_t)file_size);
2822 		else
2823 			reply(213, "Status: %jd bytes transferred.",
2824 				   (intmax_t)byte_count);
2825 	}
2826 	return (0);
2827 }
2828 
2829 /*
2830  * Note: a response of 425 is not mentioned as a possible response to
2831  *	the PASV command in RFC959. However, it has been blessed as
2832  *	a legitimate response by Jon Postel in a telephone conversation
2833  *	with Rick Adams on 25 Jan 89.
2834  */
2835 void
2836 passive(void)
2837 {
2838 	socklen_t len;
2839 	int on;
2840 	char *p, *a;
2841 
2842 	if (pdata >= 0)		/* close old port if one set */
2843 		close(pdata);
2844 
2845 	pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2846 	if (pdata < 0) {
2847 		perror_reply(425, "Can't open passive connection");
2848 		return;
2849 	}
2850 	on = 1;
2851 	if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2852 		syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2853 
2854 	(void) seteuid(0);
2855 
2856 #ifdef IP_PORTRANGE
2857 	if (ctrl_addr.su_family == AF_INET) {
2858 	    on = restricted_data_ports ? IP_PORTRANGE_HIGH
2859 				       : IP_PORTRANGE_DEFAULT;
2860 
2861 	    if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2862 			    &on, sizeof(on)) < 0)
2863 		    goto pasv_error;
2864 	}
2865 #endif
2866 #ifdef IPV6_PORTRANGE
2867 	if (ctrl_addr.su_family == AF_INET6) {
2868 	    on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2869 				       : IPV6_PORTRANGE_DEFAULT;
2870 
2871 	    if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2872 			    &on, sizeof(on)) < 0)
2873 		    goto pasv_error;
2874 	}
2875 #endif
2876 
2877 	pasv_addr = ctrl_addr;
2878 	pasv_addr.su_port = 0;
2879 	if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2880 		goto pasv_error;
2881 
2882 	(void) seteuid(pw->pw_uid);
2883 
2884 	len = sizeof(pasv_addr);
2885 	if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2886 		goto pasv_error;
2887 	if (listen(pdata, 1) < 0)
2888 		goto pasv_error;
2889 	if (pasv_addr.su_family == AF_INET)
2890 		a = (char *) &pasv_addr.su_sin.sin_addr;
2891 	else if (pasv_addr.su_family == AF_INET6 &&
2892 		 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2893 		a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2894 	else
2895 		goto pasv_error;
2896 
2897 	p = (char *) &pasv_addr.su_port;
2898 
2899 #define UC(b) (((int) b) & 0xff)
2900 
2901 	reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2902 		UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2903 	return;
2904 
2905 pasv_error:
2906 	(void) seteuid(pw->pw_uid);
2907 	(void) close(pdata);
2908 	pdata = -1;
2909 	perror_reply(425, "Can't open passive connection");
2910 	return;
2911 }
2912 
2913 /*
2914  * Long Passive defined in RFC 1639.
2915  *     228 Entering Long Passive Mode
2916  *         (af, hal, h1, h2, h3,..., pal, p1, p2...)
2917  */
2918 
2919 void
2920 long_passive(char *cmd, int pf)
2921 {
2922 	socklen_t len;
2923 	int on;
2924 	char *p, *a;
2925 
2926 	if (pdata >= 0)		/* close old port if one set */
2927 		close(pdata);
2928 
2929 	if (pf != PF_UNSPEC) {
2930 		if (ctrl_addr.su_family != pf) {
2931 			switch (ctrl_addr.su_family) {
2932 			case AF_INET:
2933 				pf = 1;
2934 				break;
2935 			case AF_INET6:
2936 				pf = 2;
2937 				break;
2938 			default:
2939 				pf = 0;
2940 				break;
2941 			}
2942 			/*
2943 			 * XXX
2944 			 * only EPRT/EPSV ready clients will understand this
2945 			 */
2946 			if (strcmp(cmd, "EPSV") == 0 && pf) {
2947 				reply(522, "Network protocol mismatch, "
2948 					"use (%d)", pf);
2949 			} else
2950 				reply(501, "Network protocol mismatch."); /*XXX*/
2951 
2952 			return;
2953 		}
2954 	}
2955 
2956 	pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2957 	if (pdata < 0) {
2958 		perror_reply(425, "Can't open passive connection");
2959 		return;
2960 	}
2961 	on = 1;
2962 	if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2963 		syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2964 
2965 	(void) seteuid(0);
2966 
2967 	pasv_addr = ctrl_addr;
2968 	pasv_addr.su_port = 0;
2969 	len = pasv_addr.su_len;
2970 
2971 #ifdef IP_PORTRANGE
2972 	if (ctrl_addr.su_family == AF_INET) {
2973 	    on = restricted_data_ports ? IP_PORTRANGE_HIGH
2974 				       : IP_PORTRANGE_DEFAULT;
2975 
2976 	    if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2977 			    &on, sizeof(on)) < 0)
2978 		    goto pasv_error;
2979 	}
2980 #endif
2981 #ifdef IPV6_PORTRANGE
2982 	if (ctrl_addr.su_family == AF_INET6) {
2983 	    on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2984 				       : IPV6_PORTRANGE_DEFAULT;
2985 
2986 	    if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2987 			    &on, sizeof(on)) < 0)
2988 		    goto pasv_error;
2989 	}
2990 #endif
2991 
2992 	if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
2993 		goto pasv_error;
2994 
2995 	(void) seteuid(pw->pw_uid);
2996 
2997 	if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2998 		goto pasv_error;
2999 	if (listen(pdata, 1) < 0)
3000 		goto pasv_error;
3001 
3002 #define UC(b) (((int) b) & 0xff)
3003 
3004 	if (strcmp(cmd, "LPSV") == 0) {
3005 		p = (char *)&pasv_addr.su_port;
3006 		switch (pasv_addr.su_family) {
3007 		case AF_INET:
3008 			a = (char *) &pasv_addr.su_sin.sin_addr;
3009 		v4_reply:
3010 			reply(228,
3011 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
3012 			      4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
3013 			      2, UC(p[0]), UC(p[1]));
3014 			return;
3015 		case AF_INET6:
3016 			if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
3017 				a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
3018 				goto v4_reply;
3019 			}
3020 			a = (char *) &pasv_addr.su_sin6.sin6_addr;
3021 			reply(228,
3022 "Entering Long Passive Mode "
3023 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
3024 			      6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
3025 			      UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
3026 			      UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
3027 			      UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
3028 			      2, UC(p[0]), UC(p[1]));
3029 			return;
3030 		}
3031 	} else if (strcmp(cmd, "EPSV") == 0) {
3032 		switch (pasv_addr.su_family) {
3033 		case AF_INET:
3034 		case AF_INET6:
3035 			reply(229, "Entering Extended Passive Mode (|||%d|)",
3036 				ntohs(pasv_addr.su_port));
3037 			return;
3038 		}
3039 	} else {
3040 		/* more proper error code? */
3041 	}
3042 
3043 pasv_error:
3044 	(void) seteuid(pw->pw_uid);
3045 	(void) close(pdata);
3046 	pdata = -1;
3047 	perror_reply(425, "Can't open passive connection");
3048 	return;
3049 }
3050 
3051 /*
3052  * Generate unique name for file with basename "local"
3053  * and open the file in order to avoid possible races.
3054  * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
3055  * Return descriptor to the file, set "name" to its name.
3056  *
3057  * Generates failure reply on error.
3058  */
3059 static int
3060 guniquefd(char *local, char **name)
3061 {
3062 	static char new[MAXPATHLEN];
3063 	struct stat st;
3064 	char *cp;
3065 	int count;
3066 	int fd;
3067 
3068 	cp = strrchr(local, '/');
3069 	if (cp)
3070 		*cp = '\0';
3071 	if (stat(cp ? local : ".", &st) < 0) {
3072 		perror_reply(553, cp ? local : ".");
3073 		return (-1);
3074 	}
3075 	if (cp) {
3076 		/*
3077 		 * Let not overwrite dirname with counter suffix.
3078 		 * -4 is for /nn\0
3079 		 * In this extreme case dot won't be put in front of suffix.
3080 		 */
3081 		if (strlen(local) > sizeof(new) - 4) {
3082 			reply(553, "Pathname too long.");
3083 			return (-1);
3084 		}
3085 		*cp = '/';
3086 	}
3087 	/* -4 is for the .nn<null> we put on the end below */
3088 	(void) snprintf(new, sizeof(new) - 4, "%s", local);
3089 	cp = new + strlen(new);
3090 	/*
3091 	 * Don't generate dotfile unless requested explicitly.
3092 	 * This covers the case when basename gets truncated off
3093 	 * by buffer size.
3094 	 */
3095 	if (cp > new && cp[-1] != '/')
3096 		*cp++ = '.';
3097 	for (count = 0; count < 100; count++) {
3098 		/* At count 0 try unmodified name */
3099 		if (count)
3100 			(void)sprintf(cp, "%d", count);
3101 		if ((fd = open(count ? new : local,
3102 		    O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
3103 			*name = count ? new : local;
3104 			return (fd);
3105 		}
3106 		if (errno != EEXIST) {
3107 			perror_reply(553, count ? new : local);
3108 			return (-1);
3109 		}
3110 	}
3111 	reply(452, "Unique file name cannot be created.");
3112 	return (-1);
3113 }
3114 
3115 /*
3116  * Format and send reply containing system error number.
3117  */
3118 void
3119 perror_reply(int code, char *string)
3120 {
3121 
3122 	reply(code, "%s: %s.", string, strerror(errno));
3123 }
3124 
3125 static char *onefile[] = {
3126 	"",
3127 	0
3128 };
3129 
3130 void
3131 send_file_list(char *whichf)
3132 {
3133 	struct stat st;
3134 	DIR *dirp = NULL;
3135 	struct dirent *dir;
3136 	FILE *dout = NULL;
3137 	char **dirlist, *dirname;
3138 	int simple = 0;
3139 	int freeglob = 0;
3140 	glob_t gl;
3141 
3142 	if (strpbrk(whichf, "~{[*?") != NULL) {
3143 		int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
3144 
3145 		memset(&gl, 0, sizeof(gl));
3146 		gl.gl_matchc = MAXGLOBARGS;
3147 		flags |= GLOB_LIMIT;
3148 		freeglob = 1;
3149 		if (glob(whichf, flags, 0, &gl)) {
3150 			reply(550, "No matching files found.");
3151 			goto out;
3152 		} else if (gl.gl_pathc == 0) {
3153 			errno = ENOENT;
3154 			perror_reply(550, whichf);
3155 			goto out;
3156 		}
3157 		dirlist = gl.gl_pathv;
3158 	} else {
3159 		onefile[0] = whichf;
3160 		dirlist = onefile;
3161 		simple = 1;
3162 	}
3163 
3164 	while ((dirname = *dirlist++)) {
3165 		if (stat(dirname, &st) < 0) {
3166 			/*
3167 			 * If user typed "ls -l", etc, and the client
3168 			 * used NLST, do what the user meant.
3169 			 */
3170 			if (dirname[0] == '-' && *dirlist == NULL &&
3171 			    dout == NULL)
3172 				retrieve(_PATH_LS " %s", dirname);
3173 			else
3174 				perror_reply(550, whichf);
3175 			goto out;
3176 		}
3177 
3178 		if (S_ISREG(st.st_mode)) {
3179 			if (dout == NULL) {
3180 				dout = dataconn("file list", -1, "w");
3181 				if (dout == NULL)
3182 					goto out;
3183 				STARTXFER;
3184 			}
3185 			START_UNSAFE;
3186 			fprintf(dout, "%s%s\n", dirname,
3187 				type == TYPE_A ? "\r" : "");
3188 			END_UNSAFE;
3189 			if (ferror(dout))
3190 				goto data_err;
3191 			byte_count += strlen(dirname) +
3192 				      (type == TYPE_A ? 2 : 1);
3193 			CHECKOOB(goto abrt);
3194 			continue;
3195 		} else if (!S_ISDIR(st.st_mode))
3196 			continue;
3197 
3198 		if ((dirp = opendir(dirname)) == NULL)
3199 			continue;
3200 
3201 		while ((dir = readdir(dirp)) != NULL) {
3202 			char nbuf[MAXPATHLEN];
3203 
3204 			CHECKOOB(goto abrt);
3205 
3206 			if (dir->d_name[0] == '.' && dir->d_namlen == 1)
3207 				continue;
3208 			if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
3209 			    dir->d_namlen == 2)
3210 				continue;
3211 
3212 			snprintf(nbuf, sizeof(nbuf),
3213 				"%s/%s", dirname, dir->d_name);
3214 
3215 			/*
3216 			 * We have to do a stat to insure it's
3217 			 * not a directory or special file.
3218 			 */
3219 			if (simple || (stat(nbuf, &st) == 0 &&
3220 			    S_ISREG(st.st_mode))) {
3221 				if (dout == NULL) {
3222 					dout = dataconn("file list", -1, "w");
3223 					if (dout == NULL)
3224 						goto out;
3225 					STARTXFER;
3226 				}
3227 				START_UNSAFE;
3228 				if (nbuf[0] == '.' && nbuf[1] == '/')
3229 					fprintf(dout, "%s%s\n", &nbuf[2],
3230 						type == TYPE_A ? "\r" : "");
3231 				else
3232 					fprintf(dout, "%s%s\n", nbuf,
3233 						type == TYPE_A ? "\r" : "");
3234 				END_UNSAFE;
3235 				if (ferror(dout))
3236 					goto data_err;
3237 				byte_count += strlen(nbuf) +
3238 					      (type == TYPE_A ? 2 : 1);
3239 				CHECKOOB(goto abrt);
3240 			}
3241 		}
3242 		(void) closedir(dirp);
3243 		dirp = NULL;
3244 	}
3245 
3246 	if (dout == NULL)
3247 		reply(550, "No files found.");
3248 	else if (ferror(dout))
3249 data_err:	perror_reply(550, "Data connection");
3250 	else
3251 		reply(226, "Transfer complete.");
3252 out:
3253 	if (dout) {
3254 		ENDXFER;
3255 abrt:
3256 		(void) fclose(dout);
3257 		data = -1;
3258 		pdata = -1;
3259 	}
3260 	if (dirp)
3261 		(void) closedir(dirp);
3262 	if (freeglob) {
3263 		freeglob = 0;
3264 		globfree(&gl);
3265 	}
3266 }
3267 
3268 void
3269 reapchild(int signo)
3270 {
3271 	while (waitpid(-1, NULL, WNOHANG) > 0);
3272 }
3273 
3274 #ifdef OLD_SETPROCTITLE
3275 /*
3276  * Clobber argv so ps will show what we're doing.  (Stolen from sendmail.)
3277  * Warning, since this is usually started from inetd.conf, it often doesn't
3278  * have much of an environment or arglist to overwrite.
3279  */
3280 void
3281 setproctitle(const char *fmt, ...)
3282 {
3283 	int i;
3284 	va_list ap;
3285 	char *p, *bp, ch;
3286 	char buf[LINE_MAX];
3287 
3288 	va_start(ap, fmt);
3289 	(void)vsnprintf(buf, sizeof(buf), fmt, ap);
3290 
3291 	/* make ps print our process name */
3292 	p = Argv[0];
3293 	*p++ = '-';
3294 
3295 	i = strlen(buf);
3296 	if (i > LastArgv - p - 2) {
3297 		i = LastArgv - p - 2;
3298 		buf[i] = '\0';
3299 	}
3300 	bp = buf;
3301 	while (ch = *bp++)
3302 		if (ch != '\n' && ch != '\r')
3303 			*p++ = ch;
3304 	while (p < LastArgv)
3305 		*p++ = ' ';
3306 }
3307 #endif /* OLD_SETPROCTITLE */
3308 
3309 static void
3310 appendf(char **strp, char *fmt, ...)
3311 {
3312 	va_list ap;
3313 	char *ostr, *p;
3314 
3315 	va_start(ap, fmt);
3316 	vasprintf(&p, fmt, ap);
3317 	va_end(ap);
3318 	if (p == NULL)
3319 		fatalerror("Ran out of memory.");
3320 	if (*strp == NULL)
3321 		*strp = p;
3322 	else {
3323 		ostr = *strp;
3324 		asprintf(strp, "%s%s", ostr, p);
3325 		if (*strp == NULL)
3326 			fatalerror("Ran out of memory.");
3327 		free(ostr);
3328 	}
3329 }
3330 
3331 static void
3332 logcmd(char *cmd, char *file1, char *file2, off_t cnt)
3333 {
3334 	char *msg = NULL;
3335 	char wd[MAXPATHLEN + 1];
3336 
3337 	if (logging <= 1)
3338 		return;
3339 
3340 	if (getcwd(wd, sizeof(wd) - 1) == NULL)
3341 		strcpy(wd, strerror(errno));
3342 
3343 	appendf(&msg, "%s", cmd);
3344 	if (file1)
3345 		appendf(&msg, " %s", file1);
3346 	if (file2)
3347 		appendf(&msg, " %s", file2);
3348 	if (cnt >= 0)
3349 		appendf(&msg, " = %jd bytes", (intmax_t)cnt);
3350 	appendf(&msg, " (wd: %s", wd);
3351 	if (guest || dochroot)
3352 		appendf(&msg, "; chrooted");
3353 	appendf(&msg, ")");
3354 	syslog(LOG_INFO, "%s", msg);
3355 	free(msg);
3356 }
3357 
3358 static void
3359 logxfer(char *name, off_t size, time_t start)
3360 {
3361 	char buf[MAXPATHLEN + 1024];
3362 	char path[MAXPATHLEN + 1];
3363 	time_t now;
3364 
3365 	if (statfd >= 0) {
3366 		time(&now);
3367 		if (realpath(name, path) == NULL) {
3368 			syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
3369 			return;
3370 		}
3371 		snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
3372 			ctime(&now)+4, ident, remotehost,
3373 			path, (intmax_t)size,
3374 			(long)(now - start + (now == start)));
3375 		write(statfd, buf, strlen(buf));
3376 	}
3377 }
3378 
3379 static char *
3380 doublequote(char *s)
3381 {
3382 	int n;
3383 	char *p, *s2;
3384 
3385 	for (p = s, n = 0; *p; p++)
3386 		if (*p == '"')
3387 			n++;
3388 
3389 	if ((s2 = malloc(p - s + n + 1)) == NULL)
3390 		return (NULL);
3391 
3392 	for (p = s2; *s; s++, p++) {
3393 		if ((*p = *s) == '"')
3394 			*(++p) = '"';
3395 	}
3396 	*p = '\0';
3397 
3398 	return (s2);
3399 }
3400 
3401 /* setup server socket for specified address family */
3402 /* if af is PF_UNSPEC more than one socket may be returned */
3403 /* the returned list is dynamically allocated, so caller needs to free it */
3404 static int *
3405 socksetup(int af, char *bindname, const char *bindport)
3406 {
3407 	struct addrinfo hints, *res, *r;
3408 	int error, maxs, *s, *socks;
3409 	const int on = 1;
3410 
3411 	memset(&hints, 0, sizeof(hints));
3412 	hints.ai_flags = AI_PASSIVE;
3413 	hints.ai_family = af;
3414 	hints.ai_socktype = SOCK_STREAM;
3415 	error = getaddrinfo(bindname, bindport, &hints, &res);
3416 	if (error) {
3417 		syslog(LOG_ERR, "%s", gai_strerror(error));
3418 		if (error == EAI_SYSTEM)
3419 			syslog(LOG_ERR, "%s", strerror(errno));
3420 		return NULL;
3421 	}
3422 
3423 	/* Count max number of sockets we may open */
3424 	for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
3425 		;
3426 	socks = malloc((maxs + 1) * sizeof(int));
3427 	if (!socks) {
3428 		freeaddrinfo(res);
3429 		syslog(LOG_ERR, "couldn't allocate memory for sockets");
3430 		return NULL;
3431 	}
3432 
3433 	*socks = 0;   /* num of sockets counter at start of array */
3434 	s = socks + 1;
3435 	for (r = res; r; r = r->ai_next) {
3436 		*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
3437 		if (*s < 0) {
3438 			syslog(LOG_DEBUG, "control socket: %m");
3439 			continue;
3440 		}
3441 		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
3442 		    &on, sizeof(on)) < 0)
3443 			syslog(LOG_WARNING,
3444 			    "control setsockopt (SO_REUSEADDR): %m");
3445 		if (r->ai_family == AF_INET6) {
3446 			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
3447 			    &on, sizeof(on)) < 0)
3448 				syslog(LOG_WARNING,
3449 				    "control setsockopt (IPV6_V6ONLY): %m");
3450 		}
3451 		if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
3452 			syslog(LOG_DEBUG, "control bind: %m");
3453 			close(*s);
3454 			continue;
3455 		}
3456 		(*socks)++;
3457 		s++;
3458 	}
3459 
3460 	if (res)
3461 		freeaddrinfo(res);
3462 
3463 	if (*socks == 0) {
3464 		syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
3465 		free(socks);
3466 		return NULL;
3467 	}
3468 	return(socks);
3469 }
3470