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Fixes from (or inspired by) OpenBSD:
* Fix yacc parser error recovery so that setjmp(3)/longjmp(3) is unnecessary.
* Fix SIGURG handler to set an urgflag that's later tested, rather than
  abusing setjmp(3)/longjmp(3).
* Use "volatile sig_atomic_t" as the type of variables modified by sig handlers.
* Use sigaction(3) instead of signal(3) to set the signal handlers.
* Only set the main SIGALRM handler once.  If we need to change it,
  cache the old handler and restore appropriately...
* Remove a bunch of signal races by improving the signal handlers.
* Fix memory leak with 'ESPV ALL'.

My stuff:
* Clean up the debug message in reply(); use vsnprintf(3) instead of vsyslog(3).
* Rework parsing of OOB commands to _not_ use the yacc parser, since the
  latter isn't reentrant and the hacks to work around that are ugly.
  We now examine urgflag at appropriate locations and call handleoobcmd()
  if it's set.  Since the only OOB commands we currently implement are
  ABOR and STAT, this isn't an issue.  (I also can't find the reference in
  RFC2228 where MIC, CONF & ENC are OOB-only commands.  Go figure.)
  I could clean up the is_oob stuff some more, but the remaining stuff
  in ftpcmd.y is harmless and it's unnecessary churn right this moment.

/*	$NetBSD: extern.h,v 1.50 2004/08/09 12:56:47 lukem Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)extern.h	8.2 (Berkeley) 4/4/94
 */

/*-
 * Copyright (c) 1997-2004 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (C) 1997 and 1998 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifdef NO_LONG_LONG
# define LLF		"%ld"
# define LLFP(x)	"%" x "ld"
# define LLT		long
# define ULLF		"%lu"
# define ULLFP(x)	"%" x "lu"
# define ULLT		unsigned long
# define STRTOLL(x,y,z)	strtol(x,y,z)
# define LLTMIN		LONG_MIN
# define LLTMAX		LONG_MAX
#else
# define LLF		"%lld"
# define LLFP(x)	"%" x "lld"
# define LLT		long long
# define ULLF		"%llu"
# define ULLFP(x)	"%" x "llu"
# define ULLT		unsigned long long
# define STRTOLL(x,y,z)	strtoll(x,y,z)
# define LLTMIN		LLONG_MIN
# define LLTMAX		LLONG_MAX
#endif

#define FTP_BUFLEN	512

void	abor(void);
void	blkfree(char **);
void	closedataconn(FILE *);
char   *conffilename(const char *);
char  **copyblk(char **);
void	count_users(void);
void	cprintf(FILE *, const char *, ...)
	    __attribute__((__format__(__printf__, 2, 3)));
void	cwd(const char *);
FILE   *dataconn(const char *, off_t, const char *);
void	delete(const char *);
int	display_file(const char *, int);
char  **do_conversion(const char *);
void	dologout(int);
void	fatal(const char *);
void	feat(void);
void	format_path(char *, const char *);
int	ftpd_pclose(FILE *);
FILE   *ftpd_popen(char *[], const char *, int);
char   *getline(char *, int, FILE *);
void	init_curclass(void);
void	logxfer(const char *, off_t, const char *, const char *,
	    const struct timeval *, const char *);
struct tab *lookup(struct tab *, const char *);
void	makedir(const char *);
void	mlsd(const char *);
void	mlst(const char *);
void	opts(const char *);
void	parse_conf(const char *);
void	pass(const char *);
void	passive(void);
int	lpsvproto2af(int);
int	af2lpsvproto(int);
int	epsvproto2af(int);
int	af2epsvproto(int);
void	long_passive(char *, int);
int	extended_port(const char *);
void	epsv_protounsupp(const char *);
void	perror_reply(int, const char *);
void	pwd(void);
void	removedir(const char *);
void	renamecmd(const char *, const char *);
char   *renamefrom(const char *);
void	reply(int, const char *, ...)
	    __attribute__((__format__(__printf__, 2, 3)));
void	retrieve(char *[], const char *);
void	send_file_list(const char *);
void	show_chdir_messages(int);
void	sizecmd(const char *);
void	statcmd(void);
void	statfilecmd(const char *);
void	statxfer(void);
void	store(const char *, const char *, int);
void	user(const char *);
char   *xstrdup(const char *);
void	yyerror(char *);

#ifdef SUPPORT_UTMP
struct utmp;

void	ftpd_logwtmp(const char *, const char *, const char *);
void	ftpd_login(const struct utmp *ut);
int	ftpd_logout(const char *line);
#endif

#ifdef SUPPORT_UTMPX
struct utmpx;

void	ftpd_loginx(const struct utmpx *);
void	ftpd_logwtmpx(const char *, const char *, const char *, int, int);
#endif

#include <netinet/in.h>

#if defined(__NetBSD__)
# define HAVE_SETPROCTITLE	1
# define HAVE_SOCKADDR_SA_LEN	1
#endif

struct sockinet {
	union sockunion {
		struct sockaddr_in  su_sin;
#ifdef INET6
		struct sockaddr_in6 su_sin6;
#endif
	} si_su;
#if !HAVE_SOCKADDR_SA_LEN
	int	si_len;
#endif
};

#if !HAVE_SOCKADDR_SA_LEN
# define su_len		si_len
#else
# define su_len		si_su.su_sin.sin_len
#endif
#define su_addr		si_su.su_sin.sin_addr
#define su_family	si_su.su_sin.sin_family
#define su_port		si_su.su_sin.sin_port
#ifdef INET6
# define su_6addr	si_su.su_sin6.sin6_addr
# define su_scope_id	si_su.su_sin6.sin6_scope_id
#endif

struct tab {
	char	*name;
	short	 token;
	short	 state;
	short	 flags;	/* 1 if command implemented, 2 if has options,
	                   4 if can occur OOB */
	char	*help;
	char	*options;
};

struct ftpconv {
	struct ftpconv	*next;
	char		*suffix;	/* Suffix of requested name */
	char		*types;		/* Valid file types */
	char		*disable;	/* File to disable conversions */
	char		*command;	/* Command to do the conversion */
};

typedef enum {
	CLASS_GUEST,
	CLASS_CHROOT,
	CLASS_REAL
} class_ft;

typedef enum {
	FLAG_checkportcmd =	1<<0,	/* Check port commands */
	FLAG_denyquick =	1<<1,	/* Check ftpusers(5) before PASS */
	FLAG_modify =		1<<2,	/* Allow CHMOD, DELE, MKD, RMD, RNFR,
					   UMASK */
	FLAG_passive =		1<<3,	/* Allow PASV mode */
	FLAG_private =		1<<4,	/* Don't publish class info in STAT */
	FLAG_sanenames =	1<<5,	/* Restrict names of uploaded files */ 
	FLAG_upload =		1<<6,	/* As per modify, but also allow
					   APPE, STOR, STOU */
} classflag_t;

#define CURCLASS_FLAGS_SET(x)	(curclass.flags |=  (FLAG_ ## x))
#define CURCLASS_FLAGS_CLR(x)	(curclass.flags &= ~(FLAG_ ## x))
#define CURCLASS_FLAGS_ISSET(x)	(curclass.flags &   (FLAG_ ## x))

struct ftpclass {
	struct sockinet	 advertise;	/* PASV address to advertise as */
	char		*chroot;	/* Directory to chroot(2) to at login */
	char		*classname;	/* Current class */
	struct ftpconv	*conversions;	/* List of conversions */
	char		*display;	/* File to display upon chdir */
	char		*homedir;	/* Directory to chdir(2) to at login */
	classflag_t	 flags;		/* Flags; see classflag_t above */
	LLT		 limit;		/* Max connections (-1 = unlimited) */
	char		*limitfile;	/* File to display if limit reached */
	LLT		 maxfilesize;	/* Maximum file size of uploads */
	LLT		 maxrateget;	/* Maximum get transfer rate throttle */
	LLT		 maxrateput;	/* Maximum put transfer rate throttle */
	LLT		 maxtimeout;	/* Maximum permitted timeout */
	char		*motd;		/* MotD file to display after login */
	char		*notify;	/* Files to notify about upon chdir */
	LLT		 portmin;	/* Minumum port for passive mode */
	LLT		 portmax;	/* Maximum port for passive mode */
	LLT		 rateget;	/* Get (RETR) transfer rate throttle */
	LLT		 rateput;	/* Put (STOR) transfer rate throttle */
	LLT		 timeout;	/* Default timeout */
	class_ft	 type;		/* Class type */
	mode_t		 umask;		/* Umask to use */
	LLT		 mmapsize;	/* mmap window size */
	LLT		 readsize;	/* data read size */
	LLT		 writesize;	/* data write size */
	LLT		 sendbufsize;	/* SO_SNDBUF size */
	LLT		 sendlowat;	/* SO_SNDLOWAT size */
};

extern void		ftp_loop(void) __attribute__ ((noreturn));
extern void		ftp_handle_line(char *);

#ifndef	GLOBAL
#define	GLOBAL	extern
#endif


GLOBAL	struct sockinet ctrl_addr;
GLOBAL	struct sockinet	data_dest;
GLOBAL	struct sockinet	data_source;
GLOBAL	struct sockinet	his_addr;
GLOBAL	struct sockinet	pasv_addr;
GLOBAL	int		connections;
GLOBAL	struct ftpclass	curclass;
GLOBAL	int		debug;
GLOBAL	char		*emailaddr;
GLOBAL	int		form;
GLOBAL	int		gidcount;	/* number of entries in gidlist[] */
GLOBAL	gid_t		*gidlist;
GLOBAL	int		hasyyerrored;
GLOBAL	char		hostname[MAXHOSTNAMELEN+1];
GLOBAL	char		homedir[MAXPATHLEN];
#ifdef KERBEROS5
GLOBAL	krb5_context	kcontext;
#endif
GLOBAL	int		logged_in;
GLOBAL	int		logging;
GLOBAL	int		pdata;			/* for passive mode */
#if HAVE_SETPROCTITLE
GLOBAL	char		proctitle[BUFSIZ];	/* initial part of title */
#endif
GLOBAL	struct passwd  *pw;
GLOBAL	int		quietmessages;
GLOBAL	char		remotehost[MAXHOSTNAMELEN+1];
GLOBAL	off_t		restart_point;
GLOBAL	char		tmpline[FTP_BUFLEN];
GLOBAL	int		type;
GLOBAL	int		usedefault;		/* for data transfers */
GLOBAL	const char     *version;
GLOBAL	int		is_oob;

						/* total file data bytes */
GLOBAL	off_t		total_data_in,  total_data_out,  total_data;
						/* total number of data files */
GLOBAL	off_t		total_files_in, total_files_out, total_files;
						/* total bytes */
GLOBAL	off_t		total_bytes_in, total_bytes_out, total_bytes;
						/* total number of xfers */
GLOBAL	off_t		total_xfers_in, total_xfers_out, total_xfers;

extern	struct tab	cmdtab[];

#define	INTERNAL_LS	"/bin/ls"


#define CMD_IMPLEMENTED(x)	((x)->flags != 0)
#define CMD_HAS_OPTIONS(x)	((x)->flags & 0x2)
#define CMD_OOB(x)		((x)->flags & 0x4)

#define	CPUTC(c, f)	do { \
				putc(c, f); total_bytes++; total_bytes_out++; \
			} while (0);

#define CURCLASSTYPE	curclass.type == CLASS_GUEST  ? "GUEST"  : \
			curclass.type == CLASS_CHROOT ? "CHROOT" : \
			curclass.type == CLASS_REAL   ? "REAL"   : \
			"<unknown>"

#define ISDOTDIR(x)	(x[0] == '.' && x[1] == '\0')
#define ISDOTDOTDIR(x)	(x[0] == '.' && x[1] == '.' && x[2] == '\0')

#define EMPTYSTR(p)	((p) == NULL || *(p) == '\0')
#define NEXTWORD(P, W)	do { \
				(W) = strsep(&(P), " \t"); \
			} while ((W) != NULL && *(W) == '\0')
#define PLURAL(s)	((s) == 1 ? "" : "s")
#define REASSIGN(X,Y)	do { if (X) free(X); (X)=(Y); } while (/*CONSTCOND*/0)

#ifndef IPPORT_ANONMAX
# define IPPORT_ANONMAX	65535
#endif