mc/vfs/ftpfs.c

/* Virtual File System: FTP file system.
   Copyright (C) 1995 The Free Software Foundation
   
   Written by: 1995 Ching Hui
               1995 Jakub Jelinek
               1995, 1996, 1997 Miguel de Icaza
	       1997 Norbert Warmuth
	       1998 Pavel Machek
   
   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License
   as published by the Free Software Foundation; either version 2 of
   the License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
   
/* FTPfs TODO:

- make it more robust - all the connects etc. should handle EADDRINUSE and
  ERETRY (have I spelled these names correctly?)
- make the user able to flush a connection - all the caches will get empty
  etc., (tarfs as well), we should give there a user selectable timeout
  and assign a key sequence.  
- use hash table instead of linklist to cache ftpfs directory.
 */

/* Namespace pollution: horrible */

#include <config.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <stdarg.h>
#include <fcntl.h>
#include <pwd.h>
#include <ctype.h>	/* For isdigit */
#ifdef SCO_FLAVOR
#	include <sys/timeb.h>	/* alex: for struct timeb definition */
#endif /* SCO_FLAVOR */
#include <time.h>
#include <sys/types.h>
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#if HAVE_SYS_SELECT_H
#   include <sys/select.h>
#endif

#include "../src/setup.h"

#include <netdb.h>		/* struct hostent */
#include <sys/socket.h>		/* AF_INET */
#include <netinet/in.h>		/* struct in_addr */
#ifdef HAVE_SETSOCKOPT
#    include <netinet/ip.h>	/* IP options */
#endif
#include <arpa/inet.h>
#include <arpa/ftp.h>
#include <arpa/telnet.h>
#ifndef SCO_FLAVOR
#	include <sys/time.h>	/* alex: this redefines struct timeval */
#endif /* SCO_FLAVOR */
#include <sys/param.h>

#ifdef USE_TERMNET
#include <termnet.h>
#endif

#include "utilvfs.h"

#include "vfs.h"
#include "tcputil.h"
#include "../src/dialog.h"
#include "container.h"
#include "ftpfs.h"
#ifndef MAXHOSTNAMELEN
#    define MAXHOSTNAMELEN 64
#endif

#define ERRNOR(x,y) do { my_errno = x; return y; } while(0)
#define UPLOAD_ZERO_LENGTH_FILE

static int my_errno;
static int code;

/* Delay to retry a connection */
int ftpfs_retry_seconds = 30;

/* Method to use to connect to ftp sites */
int ftpfs_use_passive_connections = 1;

/* Method used to get directory listings:
 * 1: try 'LIST -la <path>', if it fails
 *    fall back to CWD <path>; LIST 
 * 0: always use CWD <path>; LIST  
 */
int ftpfs_use_unix_list_options = 1;

/* First "CWD <path>", then "LIST -la ." */
int ftpfs_first_cd_then_ls;

/* Use the ~/.netrc */
int use_netrc = 1;

extern char *home_dir;

/* Anonymous setup */
char *ftpfs_anonymous_passwd = 0;
int ftpfs_directory_timeout;

/* Proxy host */
char *ftpfs_proxy_host = 0;

/* wether we have to use proxy by default? */
int ftpfs_always_use_proxy;

/* source routing host */
extern int source_route;

/* Where we store the transactions */
static FILE *logfile = NULL;

/* If true, the directory cache is forced to reload */
static int force_expiration = 0;

static struct linklist *connections_list;

/* command wait_flag: */
#define NONE        0x00
#define WAIT_REPLY  0x01
#define WANT_STRING 0x02
static char reply_str [80];

static struct direntry *_get_file_entry     (struct connection *bucket, 
					     char *file_name, int op, int flags);

static char    *ftpfs_get_current_directory (struct connection *bucket);
static int      ftpfs_chdir_internal        (struct connection *bucket,
					     char *remote_path);
static void     free_bucket                 (void *data);
static void     connection_destructor       (void *data);
static void     flush_all_directory         (struct connection *bucket);
static int      get_line                    (int sock, char *buf, int buf_len,
					     char term);
static char    *get_path                    (struct connection **bucket,
					     char *path);

/* char *translate_path (struct ftpfs_connection *bucket, char *remote_path)
   Translate a Unix path, i.e. MC's internal path representation (e.g. 
   /somedir/somefile) to a path valid for the remote server. Every path 
   transfered to the remote server has to be mangled by this function 
   right prior to sending it.
   Currently only Amiga ftp servers are handled in a special manner.
   
   When the remote server is an amiga:
   a) strip leading slash if necesarry
   b) replace first occurance of ":/" with ":"
   c) strip trailing "/."
 */

static char *
translate_path (struct connection *bucket, char *remote_path)
{
    char *p;
    
    if (!bucket->remote_is_amiga)
	return g_strdup (remote_path);
    else {
	char *ret;

	if (logfile) {
	    fprintf (logfile, "MC -- translate_path: %s\n", remote_path);
	    fflush (logfile);
	}

	/*
	 * Don't change "/" into "", e.g. "CWD " would be
	 * invalid.
	 */
        if (*remote_path == '/' && remote_path[1] == '\0')
	    return g_strdup ("."); 

	/* strip leading slash */
	if (*remote_path == '/')
	    ret = g_strdup (remote_path + 1);
	else
	    ret = g_strdup (remote_path);

	/* replace first occurance of ":/" with ":" */
	if ((p = strchr (ret, ':')) && *(p + 1) == '/')
	    strcpy (p + 1, p + 2);

	/* strip trailing "/." */
	if ((p = strrchr (ret, '/')) && *(p + 1) == '.' && *(p + 2) == '\0')
	    *p = '\0';
	return ret;
    }
}

/* Extract the hostname and username from the path */

/*
 * path is in the form: [user@]hostname:port/remote-dir, e.g.:
 * ftp://sunsite.unc.edu/pub/linux
 * ftp://miguel@sphinx.nuclecu.unam.mx/c/nc
 * ftp://tsx-11.mit.edu:8192/
 * ftp://joe@foo.edu:11321/private
 * If the user is empty, e.g. ftp://@roxanne/private, then your login name
 * is supplied.
 *
 */

static char *
my_get_host_and_username (char *path, char **host, char **user, int *port, char **pass)
{
    return vfs_split_url (path, host, user, port, pass, 21, URL_DEFAULTANON);
}

/* Returns a reply code, check /usr/include/arpa/ftp.h for possible values */
static int
get_reply (int sock, char *string_buf, int string_len)
{
    char answer[1024];
    int i;
    
    for (;;) {
        if (!get_line (sock, answer, sizeof (answer), '\n')){
	    if (string_buf)
		*string_buf = 0;
	    code = 421;
	    return 4;
	}
	switch (sscanf(answer, "%d", &code)){
	    case 0:
	        if (string_buf) {
		    strncpy (string_buf, answer, string_len - 1);
		    *(string_buf + string_len - 1) = 0;
		}
	        code = 500;
	        return 5;
	    case 1:
 		if (answer[3] == '-') {
		    while (1) {
			if (!get_line (sock, answer, sizeof(answer), '\n')){
			    if (string_buf)
				*string_buf = 0;
			    code = 421;
			    return 4;
			}
			if ((sscanf (answer, "%d", &i) > 0) && 
			    (code == i) && (answer[3] == ' '))
			    break;
		    }
		}
	        if (string_buf){
		    strncpy (string_buf, answer, string_len - 1);
		    *(string_buf + string_len - 1) = 0;
		}
		return code / 100;
	}
    }
}

static int
command (struct connection *bucket, int wait_reply, char *fmt, ...)
{
    va_list ap;
    char *str, *fmt_str;
    int status;
    int sock = qsock (bucket);
    
    va_start (ap, fmt);

    fmt_str = g_strdup_vprintf (fmt, ap);
    va_end (ap);

    str = g_strconcat (fmt_str, "\r\n", NULL);
    g_free (fmt_str);

    if (logfile){
        if (strncmp (str, "PASS ", 5) == 0){
            char *tmp = "PASS <Password not logged>\r\n";
	    
            fwrite (tmp, strlen (tmp), 1, logfile);
        } else
	    fwrite (str, strlen (str), 1, logfile);

	fflush (logfile);
    }

    got_sigpipe = 0;
    enable_interrupt_key ();
    status = write (sock, str, strlen (str));
    g_free (str);
    
    if (status < 0){
	code = 421;

	if (errno == EPIPE){
	    got_sigpipe = 1;
	}
	disable_interrupt_key ();
	return TRANSIENT;
    }
    disable_interrupt_key ();
    
    if (wait_reply)
	return get_reply (sock, (wait_reply & WANT_STRING) ? reply_str : NULL, sizeof (reply_str)-1);
    return COMPLETE;
}

static void
connection_close (void *data)
{
    struct connection *bucket = data;

    if (qsock (bucket) != -1){
	print_vfs_message (_("ftpfs: Disconnecting from %s"), qhost (bucket));
	command(bucket, NONE, "QUIT");
	close(qsock(bucket));
    }
}

/* some defines only used by changetype */
/* These two are valid values for the second parameter */
#define TYPE_ASCII    0
#define TYPE_BINARY   1

/* This one is only used to initialize bucket->isbinary, don't use it as
   second parameter to changetype. */
#define TYPE_UNKNOWN -1 

static int
changetype (struct connection *bucket, int binary)
{
    if (binary != bucket->isbinary) {
        if (command (bucket, WAIT_REPLY, "TYPE %c", binary ? 'I' : 'A') != COMPLETE)
		ERRNOR (EIO, -1);
        bucket->isbinary = binary;
    }
    return binary;
}

/* This routine logs the user in */
static int 
login_server (struct connection *bucket, char *netrcpass)
{
#if defined(HSC_PROXY)
    char *proxypass, *proxyname;
#endif
    char *pass;
    char *op;
    char *name;			/* login user name */
    int  anon = 0;
    char reply_string[255];

    bucket->isbinary = TYPE_UNKNOWN;    
    if (netrcpass)
        op = g_strdup (netrcpass);
    else {
        if (!strcmp (quser (bucket), "anonymous") || 
            !strcmp (quser (bucket), "ftp")) {
	    op = g_strdup (ftpfs_anonymous_passwd);
	    anon = 1;
         } else {
            char *p;

	    if (!bucket->password){
		p = g_strconcat (_(" FTP: Password required for "), quser (bucket), 
				  " ", NULL);
		op = vfs_get_password (p);
		g_free (p);
		if (op == NULL)
			ERRNOR (EPERM, 0);
		bucket->password = g_strdup (op);
	    } else
		op = g_strdup (bucket->password);
        }
    }

    if (!anon || logfile)
	pass = g_strdup (op);
    else
	pass = g_strconcat ("-", op, NULL);
    wipe_password (op);

    
    /* Proxy server accepts: username@host-we-want-to-connect*/
    if (qproxy (bucket)){
#if defined(HSC_PROXY)
	char *p, *host;
	int port;
	p = my_get_host_and_username (ftpfs_proxy_host, &host, &proxyname,
				      &port, &proxypass);
	if (p)
	    g_free (p);
	
	g_free (host);
	if (proxypass)
	    wipe_password (proxypass);
	p = g_strconcat (_(" Proxy: Password required for "), proxyname, " ",
			  NULL);
	proxypass = vfs_get_password (p);
	g_free (p);
	if (proxypass == NULL) {
	    wipe_password (pass);
	    g_free (proxyname);
	    ERRNOR (EPERM, 0);
	}
	name = g_strdup (quser (bucket));
#else
	name = g_strconcat (quser (bucket), "@", 
		qhost (bucket)[0] == '!' ? qhost (bucket)+1 : qhost (bucket), NULL);
#endif
    } else 
	name = g_strdup (quser (bucket));
    
    if (get_reply (qsock(bucket), reply_string, sizeof (reply_string) - 1) == COMPLETE) {
	g_strup (reply_string);
	bucket->remote_is_amiga = strstr (reply_string, "AMIGA") != 0;
	if (logfile) {
	    fprintf (logfile, "MC -- remote_is_amiga =  %d\n", bucket->remote_is_amiga);
	    fflush (logfile);
	}
#if defined(HSC_PROXY)
	if (qproxy (bucket)){
	    print_vfs_message (_("ftpfs: sending proxy login name"));
	    if (command (bucket, 1, "USER %s", proxyname) != CONTINUE)
		goto proxyfail;

	    print_vfs_message (_("ftpfs: sending proxy user password"));
	    if (command (bucket, 1, "PASS %s", proxypass) != COMPLETE)
		goto proxyfail;

	    print_vfs_message (_("ftpfs: proxy authentication succeeded"));
	    if (command (bucket, 1, "SITE %s", qhost (bucket)+1) != COMPLETE)
		goto proxyfail;

	    print_vfs_message (_("ftpfs: connected to %s"), qhost (bucket)+1);
	    if (0) {
	    proxyfail:
		bucket->failed_on_login = 1;
		/* my_errno = E; */
		if (proxypass)
		    wipe_password (proxypass);
		wipe_password (pass);
		g_free (proxyname);
		g_free (name);
		ERRNOR (EPERM, 0);
	    }
	    if (proxypass)
		wipe_password (proxypass);
	    g_free (proxyname);
	}
#endif
	print_vfs_message (_("ftpfs: sending login name"));
	code = command (bucket, WAIT_REPLY, "USER %s", name);

	switch (code){
	case CONTINUE:
	    print_vfs_message (_("ftpfs: sending user password"));
            if (command (bucket, WAIT_REPLY, "PASS %s", pass) != COMPLETE)
		break;

	case COMPLETE:
	    print_vfs_message (_("ftpfs: logged in"));
	    wipe_password (pass);
	    g_free (name);
	    return 1;

	default:
	    bucket->failed_on_login = 1;
	    /* my_errno = E; */
	    if (bucket->password)
		wipe_password (bucket->password);
	    bucket->password = 0;
	    
	    goto login_fail;
	}
    }
    print_vfs_message (_("ftpfs: Login incorrect for user %s "), quser (bucket));
login_fail:
    wipe_password (pass);
    g_free (name);
    ERRNOR (EPERM, 0);
}

#ifdef HAVE_SETSOCKOPT
static void
setup_source_route (int socket, int dest)
{
    char buffer [20];
    char *ptr = buffer;

    if (!source_route)
	return;
    bzero (buffer, sizeof (buffer));
    *ptr++ = IPOPT_LSRR;
    *ptr++ = 3 + 8;
    *ptr++ = 4;			/* pointer */

    /* First hop */
    bcopy ((char *) &source_route, ptr, sizeof (int));
    ptr += 4;

    /* Second hop (ie, final destination) */
    bcopy ((char *) &dest, ptr, sizeof (int));
    ptr += 4;
    while ((ptr - buffer) & 3)
	ptr++;
    if (setsockopt (socket, IPPROTO_IP, IP_OPTIONS,
		    buffer, ptr - buffer) < 0)
	message_2s (1, MSG_ERROR, _(" Could not set source routing (%s)"), unix_error_string (errno));
}
#else
#define setup_source_route(x,y)
#endif
    
static struct no_proxy_entry {
    char  *domain;
    void  *next;
} *no_proxy;

static void
load_no_proxy_list ()
{
    /* FixMe: shouldn't be hardcoded!!! */
    char	s[BUF_LARGE]; /* provide for BUF_LARGE characters */
    struct no_proxy_entry *np, *current = 0;
    FILE	*npf;
    int		c;
    char 	*p, *mc_file;
    static int	loaded;

    if (loaded)
	return;

    mc_file = concat_dir_and_file (mc_home, "mc.no_proxy");
    if (exist_file (mc_file) &&
	(npf = fopen (mc_file, "r"))) {
	while (fgets (s, sizeof(s), npf) || !(feof (npf) || ferror (npf))) {
	    if (!(p = strchr (s, '\n'))) {	/* skip bogus entries */ 
		while ((c = fgetc (npf)) != EOF && c != '\n')
		    ;
		continue;
	    }

	    if (p == s)
		continue;

	    *p = '\0';
	    
	    np = g_new (struct no_proxy_entry, 1);
	    np->domain = g_strdup (s);
	    np->next   = NULL;
	    if (no_proxy)
		current->next = np;
	    else
		no_proxy = np;
	    current = np;
	}

	fclose (npf);
	loaded = 1;
    }
    g_free (mc_file);
}

static int
ftpfs_check_proxy (char *host)
{
    struct no_proxy_entry	*npe;

    if (!ftpfs_proxy_host || !*ftpfs_proxy_host || !host || !*host)
	return 0;		/* sanity check */

    if (*host == '!')
	return 1;
    
    if (!ftpfs_always_use_proxy)
	return 0;

    if (!strchr (host, '.'))
	return 0;

    load_no_proxy_list ();
    for (npe = no_proxy; npe; npe=npe->next) {
	char	*domain = npe->domain;

	if (domain[0] == '.') {
	    int		ld = strlen (domain);
	    int		lh = strlen (host);

	    while (ld && lh && host[lh - 1] == domain[ld - 1]) {
		ld--;
		lh--;
	    }

	    if (!ld)
		return 0;
	} else
	    if (!g_strcasecmp (host, domain))
		return 0;
    }

    return 1;
}

static void
ftpfs_get_proxy_host_and_port (char *proxy, char **host, int *port)
{
    char *user, *pass, *dir;

#if defined(HSC_PROXY)
#define PORT 9875
#else
#define PORT 21
#endif
    dir = vfs_split_url (proxy, host, &user, port, &pass, PORT, URL_DEFAULTANON);

    g_free (user);
    if (pass)
	wipe_password (pass);
    if (dir)
	g_free (dir);
}

static int
ftpfs_open_socket (struct connection *bucket)
{
    struct   sockaddr_in server_address;
    struct   hostent *hp;
    int      my_socket;
    char     *host;
    int      port;
    int      free_host = 0;
    
    /* Use a proxy host? */
    host = qhost (bucket);

    if (!host || !*host){
	print_vfs_message (_("ftpfs: Invalid host name."));
        my_errno = EINVAL;
	return -1;
    }

    /* Hosts to connect to that start with a ! should use proxy */
    if (qproxy (bucket)){
	ftpfs_get_proxy_host_and_port (ftpfs_proxy_host, &host, &port);
	free_host = 1;
    }
    
    /* Get host address */
    bzero ((char *) &server_address, sizeof (server_address));
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = inet_addr (host);
    if (server_address.sin_addr.s_addr != -1)
	server_address.sin_family = AF_INET;
    else {
	hp = gethostbyname (host);
	if (hp == NULL){
	    print_vfs_message (_("ftpfs: Invalid host address."));
	    my_errno = EINVAL;
	    if (free_host)
		g_free (host);
	    return -1;
	}
	server_address.sin_family = hp->h_addrtype;

	/* We copy only 4 bytes, we can not trust hp->h_length, as it comes from the DNS */
	bcopy ((char *) hp->h_addr, (char *) &server_address.sin_addr, 4);
    }

#define THE_PORT qproxy(bucket) ? port : qport (bucket)

    server_address.sin_port = htons (THE_PORT);

    /* Connect */
    if ((my_socket = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
	my_errno = errno;
        if (free_host)
	    g_free (host);
	return -1;
    }
    setup_source_route (my_socket, server_address.sin_addr.s_addr);
    
    print_vfs_message (_("ftpfs: making connection to %s"), host);
    if (free_host)
	g_free (host);

    enable_interrupt_key (); /* clear the interrupt flag */

    if (connect (my_socket, (struct sockaddr *) &server_address,
	     sizeof (server_address)) < 0){
	my_errno = errno;
	if (errno == EINTR && got_interrupt ())
	    print_vfs_message (_("ftpfs: connection interrupted by user"));
	else
	    print_vfs_message (_("ftpfs: connection to server failed: %s"),
				   unix_error_string(errno));
	disable_interrupt_key();
	close (my_socket);
	return -1;
    }
    disable_interrupt_key();
    return my_socket;
}

static struct connection *
open_command_connection (char *host, char *user, int port, char *netrcpass)
{
    struct connection *bucket;
    int retry_seconds, count_down;

    bucket = g_new (struct connection, 1);
    
    if (bucket == NULL)
	    ERRNOR (ENOMEM, NULL);
#ifdef HAVE_MAD
    {
	extern void *watch_free_pointer;

	if (!watch_free_pointer)
	    watch_free_pointer = host;
    }
#endif
    qhost (bucket) = g_strdup (host);
    quser (bucket) = g_strdup (user);
    qcdir (bucket) = NULL;
    qport (bucket) = port;
    qlock (bucket) = 0;
    qhome (bucket) = NULL;
    qproxy (bucket)= 0;
    qupdir (bucket)= 0;
    qdcache (bucket)=0;
    bucket->__inode_counter = 0;
    bucket->lock = 0;
    bucket->use_proxy = ftpfs_check_proxy (host);
    bucket->password = 0;
    bucket->use_passive_connection = ftpfs_use_passive_connections | source_route;
    bucket->use_source_route = source_route;
    bucket->strict_rfc959_list_cmd = !ftpfs_use_unix_list_options;
    bucket->isbinary = TYPE_UNKNOWN;
    bucket->remote_is_amiga = 0;

    /* We do not want to use the passive if we are using proxies */
    if (bucket->use_proxy)
	bucket->use_passive_connection = 0;

    if ((qdcache (bucket) = linklist_init ()) == NULL) {
	my_errno = ENOMEM;
	g_free (qhost (bucket));
	g_free (quser (bucket));
	g_free (bucket);
	return NULL;
    }
    
    retry_seconds = 0;
    do { 
	bucket->failed_on_login = 0;

	qsock (bucket) = ftpfs_open_socket (bucket);
	if (qsock (bucket) == -1)  {
	    free_bucket (bucket);
	    return NULL;
	}

	if (login_server (bucket, netrcpass)) {
	    /* Logged in, no need to retry the connection */
	    break;
	} else {
	    if (bucket->failed_on_login){
		/* Close only the socket descriptor */
		close (qsock (bucket));
	    } else {
		connection_destructor (bucket);
		return NULL;
	    } 
	    if (ftpfs_retry_seconds){
		retry_seconds = ftpfs_retry_seconds;
		enable_interrupt_key ();
		for (count_down = retry_seconds; count_down; count_down--){
		    print_vfs_message (_("Waiting to retry... %d (Control-C to cancel)"), count_down);
		    sleep (1);
		    if (got_interrupt ()){
			/* my_errno = E; */
			disable_interrupt_key ();
			free_bucket (bucket);
			return NULL;
		    }
		}
		disable_interrupt_key ();
	    }
	}
    } while (retry_seconds);
    
    qhome (bucket) = ftpfs_get_current_directory (bucket);
    if (!qhome (bucket))
        qhome (bucket) = g_strdup (PATH_SEP_STR);
    qupdir (bucket) = g_strdup (PATH_SEP_STR); /* FIXME: I changed behavior to ignore last_current_dir */
    return bucket;
}

static int
is_connection_closed (struct connection *bucket)
{
    fd_set rset;
    struct timeval t;

    if (got_sigpipe){
	return 1;
    }
    t.tv_sec = 0;
    t.tv_usec = 0;
    FD_ZERO (&rset);
    FD_SET (qsock (bucket), &rset);
    while (1) {
	if (select (qsock (bucket) + 1, &rset, NULL, NULL, &t) < 0)
	    if (errno != EINTR)
		return 1;
	return 0;
#if 0
	if (FD_ISSET (qsock(bucket), &rset)) {
	    n = read (qsock(bucket), &read_ahead, sizeof (read_ahead));
	    if (n <= 0) 
		return 1;
	} 	else
#endif
    }
}

/* This routine keeps track of open connections */
/* Returns a connected socket to host */
static struct connection *
open_link (char *host, char *user, int port, char *netrcpass)
{
    int sock;
    struct connection *bucket;
    struct linklist *lptr;
    
    for (lptr = connections_list->next; 
	 lptr != connections_list; lptr = lptr->next) {
	bucket = lptr->data;
	if ((strcmp (host, qhost (bucket)) == 0) &&
	    (strcmp (user, quser (bucket)) == 0) &&
	    (port == qport (bucket))) {
	    
	    /* check the connection is closed or not, just hack */
	    if (is_connection_closed (bucket)) {
		flush_all_directory (bucket);
		sock = ftpfs_open_socket (bucket);
		if (sock != -1) {
		    close (qsock (bucket));
		    qsock (bucket) = sock;
		    if (login_server (bucket, netrcpass))
			return bucket;
		} 
		
		/* connection refused */
		lptr->prev->next = lptr->next;
		lptr->next->prev = lptr->prev;
		connection_destructor (bucket);
		return NULL;
	    }
	    return bucket;
	}
    }
    bucket = open_command_connection (host, user, port, netrcpass);
    if (bucket == NULL)
	return NULL;
    if (!linklist_insert (connections_list, bucket)) {
	my_errno = ENOMEM;
	connection_destructor (bucket);
	return NULL;
    }
    return bucket;
}

/* The returned directory should always contain a trailing slash */
static char *
ftpfs_get_current_directory (struct connection *bucket)
{
    char buf[4096], *bufp, *bufq;

    if (command (bucket, NONE, "PWD") == COMPLETE &&
        get_reply(qsock(bucket), buf, sizeof(buf)) == COMPLETE) {
    	bufp = NULL;
	for (bufq = buf; *bufq; bufq++)
	    if (*bufq == '"') {
	        if (!bufp) {
		    bufp = bufq + 1;
	        } else {
		    *bufq = 0;
		    if (*bufp) {
		        if (*(bufq - 1) != '/') {
		            *bufq++ = '/';
		            *bufq = 0;
		        }
			if (*bufp == '/')
			    return g_strdup (bufp);
			else {
			    /* If the remote server is an Amiga a leading slash
			       might be missing. MC needs it because it is used
			       as seperator between hostname and path internally. */
			    return g_strconcat( "/", bufp, 0);
			}
		    } else {
			my_errno = EIO;
			return NULL;
		    }
		}
	    }
    }
    my_errno = EIO;
    return NULL;
}

    
/* Setup Passive ftp connection, we use it for source routed connections */
static int
setup_passive (int my_socket, struct connection *bucket, struct sockaddr_in *sa)
{
    int xa, xb, xc, xd, xe, xf;
    char n [6];
    char *c = reply_str;
    
    if (command (bucket, WAIT_REPLY | WANT_STRING, "PASV") != COMPLETE)
	return 0;

    /* Parse remote parameters */
    for (c = reply_str + 4; (*c) && (!isdigit (*c)); c++)
	;
    if (!*c)
	return 0;
    if (!isdigit (*c))
	return 0;
    if (sscanf (c, "%d,%d,%d,%d,%d,%d", &xa, &xb, &xc, &xd, &xe, &xf) != 6)
	return 0;
    n [0] = (unsigned char) xa;
    n [1] = (unsigned char) xb;
    n [2] = (unsigned char) xc;
    n [3] = (unsigned char) xd;
    n [4] = (unsigned char) xe;
    n [5] = (unsigned char) xf;

    bcopy ((void *)n,     &(sa->sin_addr.s_addr), 4);
    bcopy ((void *)&n[4], &(sa->sin_port), 2);
    setup_source_route (my_socket, sa->sin_addr.s_addr);
    if (connect (my_socket, (struct sockaddr *) sa, sizeof (struct sockaddr_in)) < 0)
	return 0;
    return 1;
}

static int
initconn (struct connection *bucket)
{
    struct sockaddr_in data_addr;
    int data, len = sizeof(data_addr);
    struct protoent *pe;

    getsockname(qsock(bucket), (struct sockaddr *) &data_addr, &len);
    data_addr.sin_port = 0;
    
    pe = getprotobyname("tcp");
    if (pe == NULL)
	    ERRNOR (EIO, -1);
    data = socket (AF_INET, SOCK_STREAM, pe->p_proto);
    if (data < 0)
	    ERRNOR (EIO, -1);

#ifdef ORIGINAL_CONNECT_CODE
    if (bucket->use_source_route){
	int c;
	
	if ((c = setup_passive (data, bucket, &data_addr)))
	    return data;
	print_vfs_message(_("ftpfs: could not setup passive mode for source routing"));
	bucket->use_source_route = 0;
    }
#else
    if (bucket->use_passive_connection){
	if ((bucket->use_passive_connection = setup_passive (data, bucket, &data_addr)))
	    return data;

	bucket->use_source_route = 0;
	bucket->use_passive_connection = 0;
	print_vfs_message (_("ftpfs: could not setup passive mode"));
    }
#endif
    /* If passive setup fails, fallback to active connections */
    /* Active FTP connection */
    if (bind (data, (struct sockaddr *)&data_addr, len) < 0)
	goto error_return;
    getsockname(data, (struct sockaddr *) &data_addr, &len);
    if (listen (data, 1) < 0)
	goto error_return;
    {
	unsigned char *a = (unsigned char *)&data_addr.sin_addr;
	unsigned char *p = (unsigned char *)&data_addr.sin_port;
	
	if (command (bucket, WAIT_REPLY, "PORT %d,%d,%d,%d,%d,%d", a[0], a[1], 
		     a[2], a[3], p[0], p[1]) != COMPLETE)
	    goto error_return;
    }
    return data;
error_return:
    close(data);
    my_errno = EIO;
    return -1;
}

static int
open_data_connection (struct connection *bucket, char *cmd, char *remote, 
		int isbinary, int reget)
{
    struct sockaddr_in from;
    int s, j, data, fromlen = sizeof(from);
    
    if ((s = initconn (bucket)) == -1)
        return -1;
    if (changetype (bucket, isbinary) == -1)
        return -1;
    if (reget > 0){
	j = command (bucket, WAIT_REPLY, "REST %d", reget);
	if (j != CONTINUE)
	    return -1;
    }
    if (remote){
	char *path = translate_path (bucket, remote);
	
        j = command (bucket, WAIT_REPLY, "%s %s", cmd, path);
	g_free (path);
    } else
    	j = command (bucket, WAIT_REPLY, "%s", cmd);
    if (j != PRELIM)
	    ERRNOR (EPERM, -1);
    enable_interrupt_key();
    if (bucket->use_passive_connection)
	data = s;
    else {
	data = accept (s, (struct sockaddr *)&from, &fromlen);
	if (data < 0) {
	    my_errno = errno;
	    close(s);
	    return -1;
	}
	close(s);
    } 
    disable_interrupt_key();
    return data;
}

static void
my_abort (struct connection *bucket, int dsock)
{
    static unsigned char ipbuf[3] = { IAC, IP, IAC };
    fd_set mask;
    char buf[1024];

    print_vfs_message(_("ftpfs: aborting transfer."));
    if (send(qsock(bucket), ipbuf, sizeof(ipbuf), MSG_OOB) != sizeof(ipbuf)) {
	print_vfs_message(_("ftpfs: abort error: %s"), unix_error_string(errno));
	return;
    }
    
    if (command(bucket, NONE, "%cABOR", DM) != COMPLETE){
	print_vfs_message (_("ftpfs: abort failed"));
	return;
    }
    if (dsock != -1) {
	FD_ZERO(&mask);
	FD_SET(dsock, &mask);
	if (select(dsock + 1, &mask, NULL, NULL, NULL) > 0)
	    while (read(dsock, buf, sizeof(buf)) > 0);
    }
    if ((get_reply(qsock(bucket), NULL, 0) == TRANSIENT) && (code == 426))
	get_reply(qsock(bucket), NULL, 0);
}

static void
resolve_symlink_without_ls_options(struct connection *bucket, struct dir *dir)
{
    struct linklist *flist;
    struct direntry *fe, *fel;
    char tmp[MC_MAXPATHLEN];
    int depth;
    
    dir->symlink_status = FTPFS_RESOLVING_SYMLINKS;
    for (flist = dir->file_list->next; flist != dir->file_list; flist = flist->next) {
        /* flist->data->l_stat is alread initialized with 0 */
        fel = flist->data;
        if (S_ISLNK(fel->s.st_mode) && fel->linkname) {
  	    if (fel->linkname[0] == '/') {
		if (strlen (fel->linkname) >= MC_MAXPATHLEN)
		    continue;
 	        strcpy (tmp, fel->linkname);
	    } else {
		if ((strlen (dir->remote_path) + strlen (fel->linkname)) >= MC_MAXPATHLEN)
		    continue;
                strcpy (tmp, dir->remote_path);
                if (tmp[1] != '\0')
                   strcat (tmp, "/");
                strcat (tmp + 1, fel->linkname);
	    }
	    for ( depth = 0; depth < 100; depth++) { /* depth protects against recursive symbolic links */
		canonicalize_pathname (tmp);
                fe = _get_file_entry(bucket, tmp, 0, 0);
                if (fe) {
                    if (S_ISLNK (fe->s.st_mode) && fe->l_stat == 0) {
		        /* Symlink points to link which isn't resolved, yet. */
			if (fe->linkname[0] == '/') {
		            if (strlen (fe->linkname) >= MC_MAXPATHLEN)
		                break;
			    strcpy (tmp, fe->linkname);
			} else {
			    /* at this point tmp looks always like this
			       /directory/filename, i.e. no need to check
				strrchr's return value */
			    *(strrchr (tmp, '/') + 1) = '\0'; /* dirname */
		            if ((strlen (tmp) + strlen (fe->linkname)) >= MC_MAXPATHLEN)
		                break;
			    strcat (tmp, fe->linkname);
			}
			continue;
                    } else {
	                fel->l_stat = g_new (struct stat, 1);
			if ( S_ISLNK (fe->s.st_mode))
 		            *fel->l_stat = *fe->l_stat;
			else
 		            *fel->l_stat = fe->s;
                        (*fel->l_stat).st_ino = bucket->__inode_counter++;
                    }
	        }
                break;
	    }
        }
    }
    dir->symlink_status = FTPFS_RESOLVED_SYMLINKS;
}

static void
resolve_symlink_with_ls_options(struct connection *bucket, struct dir *dir)
{
    char  buffer[2048] = "", *filename;
    int sock;
    FILE *fp;
    struct stat s;
    struct linklist *flist;
    struct direntry *fe;
    int switch_method = 0;
    
    dir->symlink_status = FTPFS_RESOLVED_SYMLINKS;
    if (strchr (dir->remote_path, ' ')) {
        if (ftpfs_chdir_internal (bucket, dir->remote_path) != COMPLETE) {
            print_vfs_message(_("ftpfs: CWD failed."));
	    return;
        }
        sock = open_data_connection (bucket, "LIST -lLa", ".", TYPE_ASCII, 0);
    }
    else
        sock = open_data_connection (bucket, "LIST -lLa", 
                                     dir->remote_path, TYPE_ASCII, 0);

    if (sock == -1) {
	print_vfs_message(_("ftpfs: couldn't resolve symlink"));
	return;
    }
    
    fp = fdopen(sock, "r");
    if (fp == NULL) {
	close(sock);
	print_vfs_message(_("ftpfs: couldn't resolve symlink"));
	return;
    }
    enable_interrupt_key();
    flist = dir->file_list->next;
    while (1) {
	do {
	    if (flist == dir->file_list)
		goto done;
	    fe = flist->data;
	    flist = flist->next;
	} while (!S_ISLNK(fe->s.st_mode));
	while (1) {
	    if (fgets (buffer, sizeof (buffer), fp) == NULL)
		goto done;
	    if (logfile){
		fputs (buffer, logfile);
	        fflush (logfile);
	    }
	    if (vfs_parse_ls_lga (buffer, &s, &filename, NULL)) {
		int r = strcmp(fe->name, filename);
		g_free(filename);
		if (r == 0) {
                    if (S_ISLNK (s.st_mode)) {
                        /* This server doesn't understand LIST -lLa */
                        switch_method = 1;
                        goto done;
                    }
		    fe->l_stat = g_new (struct stat, 1);
		    if (fe->l_stat == NULL)
			goto done;
		    *fe->l_stat = s;
                    (*fe->l_stat).st_ino = bucket->__inode_counter++;
		    break;
		}
		if (r < 0)
		    break;
	    }
	}
    }
done:
    while (fgets(buffer, sizeof(buffer), fp) != NULL);
    disable_interrupt_key();
    fclose(fp);
    get_reply(qsock(bucket), NULL, 0);
    if (switch_method) {
        bucket->strict_rfc959_list_cmd = 1;
	resolve_symlink_without_ls_options(bucket, dir);
    }
}

static void
resolve_symlink(struct connection *bucket, struct dir *dir)
{
    print_vfs_message(_("Resolving symlink..."));

    if (bucket->strict_rfc959_list_cmd) 
	resolve_symlink_without_ls_options(bucket, dir);
    else
        resolve_symlink_with_ls_options(bucket, dir);
}


#define X "ftp"
#define X_myname "/#ftp:"
#define vfs_X_ops vfs_ftpfs_ops
#define X_fill_names ftpfs_fill_names
#define X_hint_reread ftpfs_hint_reread
#define X_flushdir ftpfs_flushdir
#define X_done ftpfs_done
#include "shared_ftp_fish.c"

static char*
get_path (struct connection **bucket, char *path)
{
    return s_get_path (bucket, path, "/#ftp:");
}

/* Inserts an entry for "." (and "..") into the linked list. Ignore any 
   errors because "." isn't important (as fas as you don't try to save a
   file in the root dir of the ftp server).
   Actually the dot is needed when stating the root directory, e.g.
   mc_stat ("/ftp#localhost", &buf). Down the call tree _get_file_entry
   gets called with filename = "/" which will be transformed into "."
   before searching for a fileentry. Whithout "." in the linked list
   this search fails.  -- Norbert. */
static void
insert_dots (struct linklist *file_list, struct connection *bucket)
{
    struct direntry *fe;
    int i;
    char buffer[][58] = { 
          "drwxrwxrwx   1 0        0            1024 Jan  1  1970 .",
          "drwxrwxrwx   1 0        0            1024 Jan  1  1970 .."
    };

    for (i = 0; i < 2; i++ ) {
        fe = malloc(sizeof(struct direntry));
        if (fe == NULL)
	    return;
        if (vfs_parse_ls_lga (buffer[i], &fe->s, &fe->name, &fe->linkname)) {
	    fe->freshly_created = 0;
	    fe->count = 1;
	    fe->local_filename = fe->remote_filename = NULL;
	    fe->l_stat = NULL;
	    fe->bucket = bucket;
	    (fe->s).st_ino = bucket->__inode_counter++;

	    if (!linklist_insert(file_list, fe))
	        free(fe);
        } else
	    free (fe);
    }
}

static struct dir *
retrieve_dir(struct connection *bucket, char *remote_path, int resolve_symlinks)
{
#ifdef OLD_READ
    FILE *fp;
#endif
    int sock, has_symlinks;
    struct linklist *file_list, *p;
    struct direntry *fe;
    char buffer[8192];
    struct dir *dcache;
    int got_intr = 0;
    int dot_found = 0;
    int has_spaces = (strchr (remote_path, ' ') != NULL);

    canonicalize_pathname (remote_path);
    for (p = qdcache(bucket)->next;p != qdcache(bucket);
	 p = p->next) {
	dcache = p->data;
	if (strcmp(dcache->remote_path, remote_path) == 0) {
	    struct timeval tim;

	    gettimeofday(&tim, NULL);
	    if (((tim.tv_sec < dcache->timestamp.tv_sec) && !force_expiration)
                || dcache->symlink_status == FTPFS_RESOLVING_SYMLINKS) {
                if (resolve_symlinks && dcache->symlink_status == FTPFS_UNRESOLVED_SYMLINKS)
	            resolve_symlink(bucket, dcache);
		return dcache;
	    } else {
		force_expiration = 0;
		p->next->prev = p->prev;
		p->prev->next = p->next;
		dir_destructor(dcache);
		g_free (p);
		break;
	    }
	}
    }

    has_symlinks = 0;
    if (bucket->strict_rfc959_list_cmd)
        print_vfs_message(_("ftpfs: Reading FTP directory %s... (don't use UNIX ls options)"), remote_path);
    else
        print_vfs_message(_("ftpfs: Reading FTP directory %s..."), remote_path);
    if (has_spaces || bucket->strict_rfc959_list_cmd || ftpfs_first_cd_then_ls) {
        if (ftpfs_chdir_internal (bucket, remote_path) != COMPLETE) {
            my_errno = ENOENT;
	    print_vfs_message(_("ftpfs: CWD failed."));
	    return NULL;
        }
    }

    file_list = linklist_init();
    if (file_list == NULL)
	    ERRNOR (ENOMEM, NULL);
    dcache = g_new (struct dir, 1);
    if (dcache == NULL) {
	my_errno = ENOMEM;
	linklist_destroy(file_list, NULL);
	print_vfs_message(_("ftpfs: FAIL"));
	return NULL;
    }
    gettimeofday(&dcache->timestamp, NULL);
    dcache->timestamp.tv_sec += ftpfs_directory_timeout;
    dcache->file_list = file_list;
    dcache->remote_path = g_strdup(remote_path);
    dcache->count = 1;
    dcache->symlink_status = FTPFS_NO_SYMLINKS;

    if (bucket->strict_rfc959_list_cmd == 1) 
        sock = open_data_connection (bucket, "LIST", 0, TYPE_ASCII, 0);
    else if (has_spaces || ftpfs_first_cd_then_ls)
        sock = open_data_connection (bucket, "LIST -la", ".", TYPE_ASCII, 0);
    else {
	/* Trailing "/." is necessary if remote_path is a symlink
           but don't generate "//." */
	char *path = g_strconcat (remote_path, 
			remote_path[1] == '\0' ? "" : PATH_SEP_STR, 
			".", (char *) 0);

        sock = open_data_connection (bucket, "LIST -la", path, TYPE_ASCII, 0);
	g_free (path);
    }

    if (sock == -1)
	goto fallback;

#ifdef OLD_READ
#define close_this_sock(x,y) fclose (x)
    fp = fdopen(sock, "r");
    if (fp == NULL) {
	my_errno = errno;
	close(sock);
        goto error_2;
    }
#else
#define close_this_sock(x,y) close (y)
#endif
    
    /* Clear the interrupt flag */
    enable_interrupt_key ();
    
    errno = 0;
#ifdef OLD_READ
    while (fgets (buffer, sizeof (buffer), fp) != NULL) {
	if (got_intr = got_interrupt ())
	    break;
#else
    while ((got_intr = get_line_interruptible (buffer, sizeof (buffer), sock)) != EINTR){
#endif
	int eof = got_intr == 0;

	if (logfile){
	    fputs (buffer, logfile);
            fputs ("\n", logfile);
	    fflush (logfile);
	}
	if (buffer [0] == 0 && eof)
	    break;
	fe = g_new (struct direntry, 1);
	fe->freshly_created = 0;
	fe->local_filename = NULL;
	if (fe == NULL) {
	    my_errno = ENOMEM;
	    goto error_1;
	}
        if (vfs_parse_ls_lga (buffer, &fe->s, &fe->name, &fe->linkname)) {
	    if (strcmp (fe->name, ".") == 0)
		dot_found = 1;
	    fe->count = 1;
	    fe->local_filename = fe->remote_filename = NULL;
	    fe->l_stat = NULL;
	    fe->bucket = bucket;
            (fe->s).st_ino = bucket->__inode_counter++;
	    if (S_ISLNK(fe->s.st_mode))
		has_symlinks = 1;
	    
	    if (!linklist_insert(file_list, fe)) {
		g_free(fe);
		my_errno = ENOMEM;
	        goto error_1;
	    }
	}
	else
	    g_free(fe);
	if (eof)
	    break;
    }
    if (got_intr){
	disable_interrupt_key();
	print_vfs_message(_("ftpfs: reading FTP directory interrupt by user"));
#ifdef OLD_READ
	my_abort(bucket, fileno(fp));
#else
	my_abort(bucket, sock);
#endif
	close_this_sock(fp, sock);
	my_errno = EINTR;
	goto error_3;
    }
    close_this_sock(fp, sock);
    disable_interrupt_key();
    if ((get_reply (qsock (bucket), NULL, 0) != COMPLETE) || 
        (file_list->next == file_list))
        goto fallback;

ok:
    if (!dot_found)
	insert_dots (file_list, bucket);

    if (!linklist_insert(qdcache(bucket), dcache)) {
	my_errno = ENOMEM;
        goto error_3;
    }
    if (has_symlinks) {
        if (resolve_symlinks)
	    resolve_symlink(bucket, dcache);
        else
           dcache->symlink_status = FTPFS_UNRESOLVED_SYMLINKS;
    }
    print_vfs_message(_("ftpfs: got listing"));
    return dcache;
error_1:
    disable_interrupt_key();
    close_this_sock(fp, sock);
#ifdef OLD_READ
error_2: 
#endif
    get_reply(qsock(bucket), NULL, 0);
error_3:
    g_free(dcache->remote_path);
    g_free(dcache);
    linklist_destroy(file_list, direntry_destructor);
    print_vfs_message(_("ftpfs: failed"));
    return NULL;

fallback:
    if (bucket->__inode_counter == 0 && (!bucket->strict_rfc959_list_cmd)) {
        /* It's our first attempt to get a directory listing from this
	server (UNIX style LIST command) */
        bucket->strict_rfc959_list_cmd = 1;
	g_free(dcache->remote_path);
	g_free(dcache);
	linklist_destroy(file_list, direntry_destructor);
	return retrieve_dir (bucket, remote_path, resolve_symlinks);
    }

    /* Ok, maybe the directory exists but the remote server doesn't
       list "." and "..". 
       Check whether the directory exists:
     */
    if (has_spaces || bucket->strict_rfc959_list_cmd || 
	ftpfs_first_cd_then_ls) /* CWD has been already performed, i.e. 
                                   we know that remote_path exists */
	goto ok;
    else {
	if (bucket->remote_is_amiga) {
	    /* The Amiga ftp server needs extra processing because it
               always gets relative pathes instead of absolute pathes
               like anyone else */
	    char *p = ftpfs_get_current_directory (bucket);
	
	    if (ftpfs_chdir_internal (bucket, remote_path) == COMPLETE) {
	        ftpfs_chdir_internal (bucket, p);
	        g_free (p);
	        goto ok;
	    }
        } else {
	    if (ftpfs_chdir_internal (bucket, remote_path) == COMPLETE)
	        goto ok;
	}
    }

    my_errno = EACCES;
    g_free(dcache->remote_path);
    g_free(dcache);
    linklist_destroy(file_list, direntry_destructor);
    print_vfs_message(_("ftpfs: failed; nowhere to fallback to"));
    return NULL;
}

static int
store_file(struct direntry *fe)
{
    int local_handle, sock, n, total;
#ifdef HAVE_STRUCT_LINGER
    struct linger li;
#else
    int flag_one = 1;
#endif
    char buffer[8192];
    struct stat s;

    local_handle = open(fe->local_filename, O_RDONLY);
    unlink (fe->local_filename);
    if (local_handle == -1)
	    ERRNOR (EIO, 0);
    fstat(local_handle, &s);
    sock = open_data_connection(fe->bucket, "STOR", fe->remote_filename, TYPE_BINARY, 0);
    if (sock < 0) {
	close(local_handle);
	return 0;
    }
#ifdef HAVE_STRUCT_LINGER
    li.l_onoff = 1;
    li.l_linger = 120;
    setsockopt(sock, SOL_SOCKET, SO_LINGER, (char *) &li, sizeof(li));
#else
    setsockopt(sock, SOL_SOCKET, SO_LINGER, &flag_one, sizeof (flag_one));
#endif
    total = 0;
    
    enable_interrupt_key();
    while (1) {
	while ((n = read(local_handle, buffer, sizeof(buffer))) < 0) {
	    if (errno == EINTR) {
		if (got_interrupt()) {
		    my_errno = EINTR;
		    goto error_return;
		}
		else
		    continue;
	    }
	    my_errno = errno;
	    goto error_return;
	}
	if (n == 0)
	    break;
    	while (write(sock, buffer, n) < 0) {
	    if (errno == EINTR) {
		if (got_interrupt()) {
		    my_errno = EINTR;
		    goto error_return;
		}
		else 
		    continue;
	    }
	    my_errno = errno;
	    goto error_return;
	}
	total += n;
	print_vfs_message(_("ftpfs: storing file %d (%d)"), 
			  total, s.st_size);
    }
    disable_interrupt_key();
    close(sock);
    close(local_handle);
    if (get_reply (qsock (fe->bucket), NULL, 0) != COMPLETE)
	    ERRNOR (EIO, 0);
    return 1;
error_return:
    disable_interrupt_key();
    close(sock);
    close(local_handle);
    get_reply(qsock(fe->bucket), NULL, 0);
    return 0;
}

static int 
linear_start(struct direntry *fe, int offset)
{
    fe->local_stat.st_mtime = 0;
    fe->data_sock = open_data_connection(fe->bucket, "RETR", fe->remote_filename, TYPE_BINARY, offset);
    if (fe->data_sock == -1)
	ERRNOR (EACCES, 0);
    fe->linear_state = LS_LINEAR_OPEN;
    return 1;
}

static void
linear_abort (struct direntry *fe)
{
    my_abort(fe->bucket, fe->data_sock);
    fe->data_sock = -1;
}

static int
linear_read (struct direntry *fe, void *buf, int len)
{
    int n;
    while ((n = read (fe->data_sock, buf, len))<0) {
        if ((errno == EINTR) && !got_interrupt())
	    continue;
	break;
    }

    if (n<0)
	    linear_abort(fe);

    if (!n) {
        if ((get_reply (qsock (fe->bucket), NULL, 0) != COMPLETE)) {
	    my_errno = EIO;
	    n=-1;
	}
	close (fe->data_sock);
	fe->data_sock = -1;
    }
    ERRNOR (errno, n);
}

static void
linear_close (struct direntry *fe)
{
    if (fe->data_sock != -1)
        linear_abort(fe);
}

int ftpfs_ctl (void *data, int ctlop, int arg)
{
    struct filp *fp = data;
    switch (ctlop) {
        case MCCTL_IS_NOTREADY:
	    {
	        int v;
		
		if (!fp->fe->linear_state)
		    vfs_die ("You may not do this");
		if (fp->fe->linear_state == LS_LINEAR_CLOSED)
		    return 0;

		v = select_on_two (fp->fe->data_sock, 0);
		if (((v < 0) && (errno == EINTR)) || v == 0)
		    return 1;
		return 0;
	    }
        default:
	    return 0;
    }
}

static int
send_ftp_command(char *filename, char *cmd, int flags)
{
    char *remote_path, *p;
    struct connection *bucket;
    int r;
    int flush_directory_cache = (flags & OPT_FLUSH) && (normal_flush > 0);

    if (!(remote_path = get_path(&bucket, filename)))
	return -1;
    p = translate_path (bucket, remote_path);
    r = command (bucket, WAIT_REPLY, cmd, p);
    g_free (p);
    g_free(remote_path);
    vfs_add_noncurrent_stamps (&vfs_ftpfs_ops, (vfsid) bucket, NULL);
    if (flags & OPT_IGNORE_ERROR)
	r = COMPLETE;
    if (r != COMPLETE)
	    ERRNOR (EPERM, -1);
    if (flush_directory_cache)
	flush_all_directory(bucket);
    return 0;
}

/* This routine is called as the last step in load_setup */
void
ftpfs_init_passwd(void)
{
    struct passwd *passwd_info;
    char *p, hostname[MAXHOSTNAMELEN];
    struct hostent *hp;

    ftpfs_anonymous_passwd = load_anon_passwd ();
    if (ftpfs_anonymous_passwd)
	return;

    if ((passwd_info = getpwuid (geteuid ())) == NULL)
	p = "unknown";
    else
	p = passwd_info->pw_name;
    gethostname(hostname, sizeof(hostname));
    hp = gethostbyname(hostname);
    if (hp != NULL)
	ftpfs_anonymous_passwd = g_strconcat (p, "@", hp->h_name, NULL);
    else
	ftpfs_anonymous_passwd = g_strconcat (p, "@", hostname, NULL);
    endpwent ();
}

int
ftpfs_init (vfs *me)
{
    connections_list = linklist_init();
    ftpfs_directory_timeout = FTPFS_DIRECTORY_TIMEOUT;
    return 1;
}

static int ftpfs_chmod (vfs *me, char *path, int mode)
{
    char buf[BUF_SMALL];
    
    g_snprintf(buf, sizeof(buf), "SITE CHMOD %4.4o %%s", mode & 07777);
    return send_ftp_command(path, buf, OPT_IGNORE_ERROR | OPT_FLUSH);
}

static int ftpfs_chown (vfs *me, char *path, int owner, int group)
{
#if 0
    my_errno = EPERM;
    return -1;
#else
/* Everyone knows it is not possible to chown remotely, so why bother them.
   If someone's root, then copy/move will always try to chown it... */
    return 0;
#endif    
}

static int ftpfs_unlink (vfs *me, char *path)
{
    return send_ftp_command(path, "DELE %s", OPT_FLUSH);
}

/* Return true if path is the same directoy as the one we are on now */
static int
is_same_dir (char *path, struct connection *bucket)
{
    if (!qcdir (bucket))
	return 0;
    if (strcmp (path, qcdir (bucket)) == 0)
	return 1;
    return 0;
}

static int
ftpfs_chdir_internal (struct connection *bucket ,char *remote_path)
{
    int r;
    char *p;
    
    if (!bucket->cwd_defered && is_same_dir (remote_path, bucket))
	return COMPLETE;

    p = translate_path (bucket, remote_path);
    r = command (bucket, WAIT_REPLY, "CWD %s", p);
    g_free (p);
    
    if (r != COMPLETE) {
	my_errno = EIO;
    } else {
	if (qcdir(bucket))
	    g_free(qcdir(bucket));
	qcdir(bucket) = g_strdup (remote_path);
	bucket->cwd_defered = 0;
    }
    return r;
}

static int ftpfs_rename (vfs *me, char *path1, char *path2)
{
    send_ftp_command(path1, "RNFR %s", OPT_FLUSH);
    return send_ftp_command(path2, "RNTO %s", OPT_FLUSH);
}

static int ftpfs_mkdir (vfs *me, char *path, mode_t mode)
{
    return send_ftp_command(path, "MKD %s", OPT_FLUSH);
}

static int ftpfs_rmdir (vfs *me, char *path)
{
    return send_ftp_command(path, "RMD %s", OPT_FLUSH);
}

void ftpfs_set_debug (char *file)
{
    logfile = fopen (file, "w+");
}

static void my_forget (char *file)
{
    struct linklist *l;
    char *host, *user, *pass, *rp;
    int port;

#ifndef BROKEN_PATHS
    if (strncmp (file, "/#ftp:", 6))
        return; 	/* Normal: consider cd /bla/#ftp */ 
#else
    if (!(file = strstr (file, "/#ftp:")))
        return;
#endif    

    file += 6;
    if (!(rp = my_get_host_and_username (file, &host, &user, &port, &pass))) {
        g_free (host);
	g_free (user);
	if (pass)
	    wipe_password (pass);
	return;
    }

    /* we do not care about the path actually */
    g_free (rp);
    
    for (l = connections_list->next; l != connections_list; l = l->next){
	struct connection *bucket = l->data;
	
	if ((strcmp (host, qhost (bucket)) == 0) &&
	    (strcmp (user, quser (bucket)) == 0) &&
	    (port == qport (bucket))){
	    
	    /* close socket: the child owns it now */
	    close (bucket->sock);
	    bucket->sock = -1;

	    /* reopen the connection */
	    bucket->sock = ftpfs_open_socket (bucket);
	    if (bucket->sock != -1)
		login_server (bucket, pass);
	    break;
	}
    }
    g_free (host);
    g_free (user);
    if (pass)
        wipe_password (pass);
}

vfs vfs_ftpfs_ops = {
    NULL,	/* This is place of next pointer */
    "File Tranfer Protocol (ftp)",
    F_NET,	/* flags */
    "ftp:",	/* prefix */
    NULL,	/* data */
    0,		/* errno */
    ftpfs_init,
    ftpfs_done,
    ftpfs_fill_names,
    NULL,

    s_open,
    s_close,
    s_read,
    s_write,
    
    s_opendir,
    s_readdir,
    s_closedir,
    s_telldir,
    s_seekdir,

    s_stat,
    s_lstat,
    s_fstat,

    ftpfs_chmod,
    ftpfs_chown,	/* not really implemented but returns success */
    NULL,

    s_readlink,
    NULL,
    NULL,
    ftpfs_unlink,

    ftpfs_rename,
    s_chdir,
    s_errno,
    s_lseek,
    NULL,
    
    s_getid,
    s_nothingisopen,
    s_free,
    
    s_getlocalcopy,
    s_ungetlocalcopy,

    ftpfs_mkdir,
    ftpfs_rmdir,
    ftpfs_ctl,
    s_setctl

MMAPNULL
};

#ifdef USE_NETRC
static char buffer[BUF_MEDIUM];
static char *netrc, *netrcp;

static int netrc_next (void)
{
    char *p;
    int i;
    static char *keywords [] = { "default", "machine", 
        "login", "password", "passwd",
        "account", "macdef" };

    while (1) {
        netrcp = skip_separators (netrcp);
        if (*netrcp != '\n')
            break;
        netrcp++;
    }
    if (!*netrcp)
	return 0;
    p = buffer;
    if (*netrcp == '"') {
	for (;*netrcp != '"' && *netrcp; netrcp++) {
	    if (*netrcp == '\\')
		netrcp++;
	    *p++ = *netrcp;
	}
    } else {
	for (;*netrcp != '\n' && *netrcp != '\t' && *netrcp != ' ' &&
	    *netrcp != ',' && *netrcp; netrcp++) {
	    if (*netrcp == '\\')
		netrcp++;
	    *p++ = *netrcp;
	}
    }
    *p = 0;
    if (!*buffer)
	return 0;
    for (i = 0; i < sizeof (keywords) / sizeof (keywords [0]); i++)
	if (!strcmp (keywords [i], buffer))
	    break;
    return i + 1;
}

int lookup_netrc (char *host, char **login, char **pass)
{
    char *netrcname, *tmp;
    char hostname[MAXHOSTNAMELEN], *domain;
    int keyword;
    struct stat mystat;
    static int be_angry = 1;
    static struct rupcache {
        struct rupcache *next;
        char *host;
        char *login;
        char *pass;
    } *rup_cache = NULL, *rupp;

    for (rupp = rup_cache; rupp != NULL; rupp = rupp->next)
        if (!strcmp (host, rupp->host)) {
            if (rupp->login != NULL)
                *login = g_strdup (rupp->login);
            if (rupp->pass != NULL)
                *pass = g_strdup (rupp->pass);
            return 0;
        }
    netrcname = concat_dir_and_file (home_dir, ".netrc");
    netrcp = netrc = load_file (netrcname);
    if (netrc == NULL) {
        g_free (netrcname);
	return 0;
    }
    if (gethostname (hostname, sizeof (hostname)) < 0)
	*hostname = 0;
    if (!(domain = strchr (hostname, '.')))
	domain = "";

    while ((keyword = netrc_next ())) {
        if (keyword == 2) {
	    if (netrc_next () != 8)
		continue;
	    if (g_strcasecmp (host, buffer) &&
	        ((tmp = strchr (host, '.')) == NULL ||
		g_strcasecmp (tmp, domain) ||
		g_strncasecmp (host, buffer, tmp - host) ||
		buffer [tmp - host]))
		continue;
	} else if (keyword != 1)
	    continue;
	while ((keyword = netrc_next ()) > 2) {
	    switch (keyword) {
		case 3:
		    if (netrc_next ())
			if (*login == NULL)
			    *login = g_strdup (buffer);
			else if (strcmp (*login, buffer))
			    keyword = 20;
		    break;
		case 4:
		case 5:
		    if (strcmp (*login, "anonymous") && strcmp (*login, "ftp") &&
			stat (netrcname, &mystat) >= 0 &&
			(mystat.st_mode & 077)) {
			if (be_angry) {
			    message_1s (1, MSG_ERROR, _("~/.netrc file has not correct mode.\n"
							"Remove password or correct mode."));
			    be_angry = 0;
			}
			g_free (netrc);
			g_free (netrcname);
			return -1;
		    }
		    if (netrc_next () && *pass == NULL)
			*pass = g_strdup (buffer);
		    break;
		case 6:
		    if (stat (netrcname, &mystat) >= 0 && 
		        (mystat.st_mode & 077)) {
			if (be_angry) {
			    message_1s (1, MSG_ERROR, _("~/.netrc file has not correct mode.\n"
							"Remove password or correct mode."));
			    be_angry = 0;
			}
			g_free (netrc);
			g_free (netrcname);
			return -1;
		    }
		    netrc_next ();
		    break;
		case 7:
		    for (;;) {
		        while (*netrcp != '\n' && *netrcp);
		        if (*netrcp != '\n')
		            break;
		        netrcp++;
		        if (*netrcp == '\n' || !*netrcp)
		            break;
		    }
		    break;
	    }
	    if (keyword == 20)
	        break;
	}
	if (keyword == 20)
	    continue;
	else
	    break;
    }
    rupp = g_new (struct rupcache, 1);
    rupp->host = g_strdup (host);
    rupp->login = rupp->pass = 0;
    
    if (*login != NULL)
        rupp->login = g_strdup (*login);
    if (*pass != NULL)
        rupp->pass = g_strdup (*pass);
    rupp->next = rup_cache;
    rup_cache = rupp;
    
    g_free (netrc);
    g_free (netrcname);
    return 0;
}

#endif /* USE_NETRC */