Added libfetch linux port + misc changes

1 files changed, 1179 insertions, 0 deletions

diff --git a/lib/libfetch/ftp.c b/lib/libfetch/ftp.c
new file mode 100644
index 00000000..a28ec2db
--- /dev/null
+++ b/lib/libfetch/ftp.c
@@ -0,0 +1,1179 @@
+/*-
+ * Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav
+ * 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
+ *    in this position and unchanged.
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/cdefs.h>
+
+/*
+ * Portions of this code were taken from or based on ftpio.c:
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ *
+ * Major Changelog:
+ *
+ * Dag-Erling Coïdan Smørgrav
+ * 9 Jun 1998
+ *
+ * Incorporated into libfetch
+ *
+ * Jordan K. Hubbard
+ * 17 Jan 1996
+ *
+ * Turned inside out. Now returns xfers as new file ids, not as a special
+ * `state' of FTP_t
+ *
+ * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $
+ *
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <ctype.h>
+#include <libio.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "fetch.h"
+#include "common.h"
+#include "ftperr.h"
+
+#define FTP_ANONYMOUS_USER	"anonymous"
+
+#define FTP_CONNECTION_ALREADY_OPEN	125
+#define FTP_OPEN_DATA_CONNECTION	150
+#define FTP_OK				200
+#define FTP_FILE_STATUS			213
+#define FTP_SERVICE_READY		220
+#define FTP_TRANSFER_COMPLETE		226
+#define FTP_PASSIVE_MODE		227
+#define FTP_LPASSIVE_MODE		228
+#define FTP_EPASSIVE_MODE		229
+#define FTP_LOGGED_IN			230
+#define FTP_FILE_ACTION_OK		250
+#define FTP_DIRECTORY_CREATED		257 /* multiple meanings */
+#define FTP_FILE_CREATED		257 /* multiple meanings */
+#define FTP_WORKING_DIRECTORY		257 /* multiple meanings */
+#define FTP_NEED_PASSWORD		331
+#define FTP_NEED_ACCOUNT		332
+#define FTP_FILE_OK			350
+#define FTP_SYNTAX_ERROR		500
+#define FTP_PROTOCOL_ERROR		999
+
+static struct url cached_host;
+static conn_t	*cached_connection;
+
+#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
+			 && isdigit(foo[2]) \
+			 && (foo[3] == ' ' || foo[3] == '\0'))
+#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
+			&& isdigit(foo[2]) && foo[3] == '-')
+
+/*
+ * Translate IPv4 mapped IPv6 address to IPv4 address
+ */
+static void
+unmappedaddr(struct sockaddr_in6 *sin6)
+{
+	struct sockaddr_in *sin4;
+	u_int32_t addr;
+	int port;
+
+	if (sin6->sin6_family != AF_INET6 ||
+	    !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
+		return;
+	sin4 = (struct sockaddr_in *)sin6;
+	addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12];
+	port = sin6->sin6_port;
+	memset(sin4, 0, sizeof(struct sockaddr_in));
+	sin4->sin_addr.s_addr = addr;
+	sin4->sin_port = port;
+	sin4->sin_family = AF_INET;
+	//sin6->sin_len = sizeof(struct sockaddr_in);
+}
+
+/*
+ * Get server response
+ */
+static int
+_ftp_chkerr(conn_t *conn)
+{
+	if (_fetch_getln(conn) == -1) {
+		_fetch_syserr();
+		return (-1);
+	}
+	if (isftpinfo(conn->buf)) {
+		while (conn->buflen && !isftpreply(conn->buf)) {
+			if (_fetch_getln(conn) == -1) {
+				_fetch_syserr();
+				return (-1);
+			}
+		}
+	}
+
+	while (conn->buflen && isspace(conn->buf[conn->buflen - 1]))
+		conn->buflen--;
+	conn->buf[conn->buflen] = '\0';
+
+	if (!isftpreply(conn->buf)) {
+		_ftp_seterr(FTP_PROTOCOL_ERROR);
+		return (-1);
+	}
+
+	conn->err = (conn->buf[0] - '0') * 100
+	    + (conn->buf[1] - '0') * 10
+	    + (conn->buf[2] - '0');
+
+	return (conn->err);
+}
+
+/*
+ * Send a command and check reply
+ */
+static int
+_ftp_cmd(conn_t *conn, const char *fmt, ...)
+{
+	va_list ap;
+	size_t len;
+	char *msg;
+	int r;
+
+	va_start(ap, fmt);
+	len = vasprintf(&msg, fmt, ap);
+	va_end(ap);
+
+	if (msg == NULL) {
+		errno = ENOMEM;
+		_fetch_syserr();
+		return (-1);
+	}
+
+	r = _fetch_putln(conn, msg, len);
+	free(msg);
+
+	if (r == -1) {
+		_fetch_syserr();
+		return (-1);
+	}
+
+	return (_ftp_chkerr(conn));
+}
+
+/*
+ * Return a pointer to the filename part of a path
+ */
+static const char *
+_ftp_filename(const char *file, int *len, int *type)
+{
+	const char *s;
+
+	if ((s = strrchr(file, '/')) == NULL)
+		s = file;
+	else
+		s = s + 1;
+	*len = strlen(s);
+	if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) {
+		*type = s[*len - 1];
+		*len -= 7;
+	} else {
+		*type = '\0';
+	}
+	return (s);
+}
+
+/*
+ * Get current working directory from the reply to a CWD, PWD or CDUP
+ * command.
+ */
+static int
+_ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen)
+{
+	char *src, *dst, *end;
+	int q;
+
+	if (conn->err != FTP_WORKING_DIRECTORY &&
+	    conn->err != FTP_FILE_ACTION_OK)
+		return (FTP_PROTOCOL_ERROR);
+	end = conn->buf + conn->buflen;
+	src = conn->buf + 4;
+	if (src >= end || *src++ != '"')
+		return (FTP_PROTOCOL_ERROR);
+	for (q = 0, dst = pwd; src < end && pwdlen--; ++src) {
+		if (!q && *src == '"')
+			q = 1;
+		else if (q && *src != '"')
+			break;
+		else if (q)
+			*dst++ = '"', q = 0;
+		else
+			*dst++ = *src;
+	}
+	if (!pwdlen)
+		return (FTP_PROTOCOL_ERROR);
+	*dst = '\0';
+#if 0
+	DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd));
+#endif
+	return (FTP_OK);
+}
+
+/*
+ * Change working directory to the directory that contains the specified
+ * file.
+ */
+static int
+_ftp_cwd(conn_t *conn, const char *file)
+{
+	const char *beg, *end;
+	char pwd[PATH_MAX];
+	int e, i, len;
+
+	if ((end = strrchr(file, '/')) == NULL)
+		return (0);
+	if ((e = _ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY ||
+	    (e = _ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) {
+		_ftp_seterr(e);
+		return (-1);
+	}
+	for (;;) {
+		len = strlen(pwd);
+		/* look for a common prefix */
+		for (i = 0; i <= len && i <= end - file; ++i)
+			if (pwd[i] != file[i])
+				break;
+#if 0
+		DEBUG(fprintf(stderr, "have: [%.*s|%s]\n", i, pwd, pwd + i));
+		DEBUG(fprintf(stderr, "want: [%.*s|%s]\n", i, file, file + i));
+#endif
+		if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/'))
+			break;
+		if ((e = _ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK ||
+		    (e = _ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY ||
+		    (e = _ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) {
+			_ftp_seterr(e);
+			return (-1);
+		}
+	}
+	for (beg = file + i; beg < end; beg = file + i + 1) {
+		while (*beg == '/')
+			++beg, ++i;
+		for (++i; file + i < end && file[i] != '/'; ++i)
+			/* nothing */;
+		e = _ftp_cmd(conn, "CWD %.*s", file + i - beg, beg);
+		if (e != FTP_FILE_ACTION_OK) {
+			_ftp_seterr(e);
+			return (-1);
+		}
+	}
+	return (0);
+}
+
+/*
+ * Set transfer mode and data type
+ */
+static int
+_ftp_mode_type(conn_t *conn, int mode, int type)
+{
+	int e;
+
+	switch (mode) {
+	case 0:
+	case 's':
+		mode = 'S';
+	case 'S':
+		break;
+	default:
+		return (FTP_PROTOCOL_ERROR);
+	}
+	if ((e = _ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) {
+		if (mode == 'S') {
+			/*
+			 * Stream mode is supposed to be the default - so
+			 * much so that some servers not only do not
+			 * support any other mode, but do not support the
+			 * MODE command at all.
+			 *
+			 * If "MODE S" fails, it is unlikely that we
+			 * previously succeeded in setting a different
+			 * mode.  Therefore, we simply hope that the
+			 * server is already in the correct mode, and
+			 * silently ignore the failure.
+			 */
+		} else {
+			return (e);
+		}
+	}
+
+	switch (type) {
+	case 0:
+	case 'i':
+		type = 'I';
+	case 'I':
+		break;
+	case 'a':
+		type = 'A';
+	case 'A':
+		break;
+	case 'd':
+		type = 'D';
+	case 'D':
+		/* can't handle yet */
+	default:
+		return (FTP_PROTOCOL_ERROR);
+	}
+	if ((e = _ftp_cmd(conn, "TYPE %c", type)) != FTP_OK)
+		return (e);
+
+	return (FTP_OK);
+}
+
+/*
+ * Request and parse file stats
+ */
+static int
+_ftp_stat(conn_t *conn, const char *file, struct url_stat *us)
+{
+	char *ln;
+	const char *filename;
+	int filenamelen, type;
+	struct tm tm;
+	time_t t;
+	int e;
+
+	us->size = -1;
+	us->atime = us->mtime = 0;
+
+	filename = _ftp_filename(file, &filenamelen, &type);
+
+	if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK) {
+		_ftp_seterr(e);
+		return (-1);
+	}
+
+	e = _ftp_cmd(conn, "SIZE %.*s", filenamelen, filename);
+	if (e != FTP_FILE_STATUS) {
+		_ftp_seterr(e);
+		return (-1);
+	}
+	for (ln = conn->buf + 4; *ln && isspace(*ln); ln++)
+		/* nothing */ ;
+	for (us->size = 0; *ln && isdigit(*ln); ln++)
+		us->size = us->size * 10 + *ln - '0';
+	if (*ln && !isspace(*ln)) {
+		_ftp_seterr(FTP_PROTOCOL_ERROR);
+		us->size = -1;
+		return (-1);
+	}
+	if (us->size == 0)
+		us->size = -1;
+	DEBUG(fprintf(stderr, "size: [%lld]\n", (long long)us->size));
+
+	e = _ftp_cmd(conn, "MDTM %.*s", filenamelen, filename);
+	if (e != FTP_FILE_STATUS) {
+		_ftp_seterr(e);
+		return (-1);
+	}
+	for (ln = conn->buf + 4; *ln && isspace(*ln); ln++)
+		/* nothing */ ;
+	switch (strspn(ln, "0123456789")) {
+	case 14:
+		break;
+	case 15:
+		ln++;
+		ln[0] = '2';
+		ln[1] = '0';
+		break;
+	default:
+		_ftp_seterr(FTP_PROTOCOL_ERROR);
+		return (-1);
+	}
+	if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
+	    &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
+	    &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
+		_ftp_seterr(FTP_PROTOCOL_ERROR);
+		return (-1);
+	}
+	tm.tm_mon--;
+	tm.tm_year -= 1900;
+	tm.tm_isdst = -1;
+	t = timegm(&tm);
+	if (t == (time_t)-1)
+		t = time(NULL);
+	us->mtime = t;
+	us->atime = t;
+	DEBUG(fprintf(stderr,
+	    "last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n",
+	    tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+	    tm.tm_hour, tm.tm_min, tm.tm_sec));
+	return (0);
+}
+
+/*
+ * I/O functions for FTP
+ */
+struct ftpio {
+	conn_t	*cconn;		/* Control connection */
+	conn_t	*dconn;		/* Data connection */
+	int	 dir;		/* Direction */
+	int	 eof;		/* EOF reached */
+	int	 err;		/* Error code */
+};
+
+static int	 _ftp_readfn(void *, char *, int);
+static int	 _ftp_writefn(void *, const char *, int);
+static fpos_t	 _ftp_seekfn(void *, fpos_t, int);
+static int	 _ftp_closefn(void *);
+
+static int
+_ftp_readfn(void *v, char *buf, int len)
+{
+	struct ftpio *io;
+	int r;
+
+	io = (struct ftpio *)v;
+	if (io == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (io->err) {
+		errno = io->err;
+		return (-1);
+	}
+	if (io->eof)
+		return (0);
+	r = _fetch_read(io->dconn, buf, len);
+	if (r > 0)
+		return (r);
+	if (r == 0) {
+		io->eof = 1;
+		return (0);
+	}
+	if (errno != EINTR)
+		io->err = errno;
+	return (-1);
+}
+
+static int
+_ftp_writefn(void *v, const char *buf, int len)
+{
+	struct ftpio *io;
+	int w;
+
+	io = (struct ftpio *)v;
+	if (io == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (io->err) {
+		errno = io->err;
+		return (-1);
+	}
+	w = _fetch_write(io->dconn, buf, len);
+	if (w >= 0)
+		return (w);
+	if (errno != EINTR)
+		io->err = errno;
+	return (-1);
+}
+
+static fpos_t
+_ftp_seekfn(void *v, fpos_t pos, int whence)
+{
+    fpos_t invalid = {0};
+	struct ftpio *io;
+
+	io = (struct ftpio *)v;
+	if (io == NULL) {
+		errno = EBADF;
+		return invalid;
+	}
+	errno = ESPIPE;
+	return invalid;
+}
+
+static int
+_ftp_closefn(void *v)
+{
+	struct ftpio *io;
+	int r;
+
+	io = (struct ftpio *)v;
+	if (io == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	if (io->dir == -1)
+		return (0);
+	if (io->cconn == NULL || io->dconn == NULL) {
+		errno = EBADF;
+		return (-1);
+	}
+	_fetch_close(io->dconn);
+	io->dir = -1;
+	io->dconn = NULL;
+	DEBUG(fprintf(stderr, "Waiting for final status\n"));
+	r = _ftp_chkerr(io->cconn);
+	if (io->cconn == cached_connection && io->cconn->ref == 1)
+		cached_connection = NULL;
+	_fetch_close(io->cconn);
+	free(io);
+	return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1;
+}
+
+static FILE *
+_ftp_setup(conn_t *cconn, conn_t *dconn, int mode)
+{
+	struct ftpio *io;
+	FILE *f;
+
+	if (cconn == NULL || dconn == NULL)
+		return (NULL);
+	if ((io = malloc(sizeof(*io))) == NULL)
+		return (NULL);
+	io->cconn = cconn;
+	io->dconn = dconn;
+	io->dir = mode;
+	io->eof = io->err = 0;
+    cookie_io_functions_t cookies;
+    cookies.read = (cookie_read_function_t *)_ftp_readfn;
+    cookies.write = (cookie_write_function_t *)_ftp_writefn;
+    cookies.seek = (cookie_seek_function_t *)_ftp_seekfn;
+    cookies.close = (cookie_close_function_t *)_ftp_closefn;
+    f = fopencookie(io, "rw", cookies);
+	if (f == NULL)
+		free(io);
+	return (f);
+}
+
+/*
+ * Transfer file
+ */
+static FILE *
+_ftp_transfer(conn_t *conn, const char *oper, const char *file,
+    int mode, off_t offset, const char *flags)
+{
+	struct sockaddr_storage sa;
+	struct sockaddr_in6 *sin6;
+	struct sockaddr_in *sin4;
+	const char *bindaddr;
+	const char *filename;
+	int filenamelen, type;
+	int low, pasv, verbose;
+	int e, sd = -1;
+	socklen_t l;
+	char *s;
+	FILE *df;
+
+	/* check flags */
+	low = CHECK_FLAG('l');
+	pasv = CHECK_FLAG('p');
+	verbose = CHECK_FLAG('v');
+
+	/* passive mode */
+	if (!pasv)
+		pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL &&
+		    strncasecmp(s, "no", 2) != 0);
+
+	/* isolate filename */
+	filename = _ftp_filename(file, &filenamelen, &type);
+
+	/* set transfer mode and data type */
+	if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK)
+		goto ouch;
+
+	/* find our own address, bind, and listen */
+	l = sizeof(sa);
+	if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1)
+		goto sysouch;
+	if (sa.ss_family == AF_INET6)
+		unmappedaddr((struct sockaddr_in6 *)&sa);
+
+	/* open data socket */
+	if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
+		_fetch_syserr();
+		return (NULL);
+	}
+
+	if (pasv) {
+		u_char addr[64];
+		char *ln, *p;
+		unsigned int i;
+		int port;
+
+		/* send PASV command */
+		if (verbose)
+			_fetch_info("setting passive mode");
+		switch (sa.ss_family) {
+		case AF_INET:
+			if ((e = _ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE)
+				goto ouch;
+			break;
+		case AF_INET6:
+			if ((e = _ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) {
+				if (e == -1)
+					goto ouch;
+				if ((e = _ftp_cmd(conn, "LPSV")) !=
+				    FTP_LPASSIVE_MODE)
+					goto ouch;
+			}
+			break;
+		default:
+			e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
+			goto ouch;
+		}
+
+		/*
+		 * Find address and port number. The reply to the PASV command
+		 * is IMHO the one and only weak point in the FTP protocol.
+		 */
+		ln = conn->buf;
+		switch (e) {
+		case FTP_PASSIVE_MODE:
+		case FTP_LPASSIVE_MODE:
+			for (p = ln + 3; *p && !isdigit(*p); p++)
+				/* nothing */ ;
+			if (!*p) {
+				e = FTP_PROTOCOL_ERROR;
+				goto ouch;
+			}
+			l = (e == FTP_PASSIVE_MODE ? 6 : 21);
+			for (i = 0; *p && i < l; i++, p++)
+				addr[i] = strtol(p, &p, 10);
+			if (i < l) {
+				e = FTP_PROTOCOL_ERROR;
+				goto ouch;
+			}
+			break;
+		case FTP_EPASSIVE_MODE:
+			for (p = ln + 3; *p && *p != '('; p++)
+				/* nothing */ ;
+			if (!*p) {
+				e = FTP_PROTOCOL_ERROR;
+				goto ouch;
+			}
+			++p;
+			if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
+				&port, &addr[3]) != 5 ||
+			    addr[0] != addr[1] ||
+			    addr[0] != addr[2] || addr[0] != addr[3]) {
+				e = FTP_PROTOCOL_ERROR;
+				goto ouch;
+			}
+			break;
+		}
+
+		/* seek to required offset */
+		if (offset)
+			if (_ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK)
+				goto sysouch;
+
+		/* construct sockaddr for data socket */
+		l = sizeof(sa);
+		if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1)
+			goto sysouch;
+		if (sa.ss_family == AF_INET6)
+			unmappedaddr((struct sockaddr_in6 *)&sa);
+		switch (sa.ss_family) {
+		case AF_INET6:
+			sin6 = (struct sockaddr_in6 *)&sa;
+			if (e == FTP_EPASSIVE_MODE)
+				sin6->sin6_port = htons(port);
+			else {
+				bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
+				bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
+			}
+			break;
+		case AF_INET:
+			sin4 = (struct sockaddr_in *)&sa;
+			if (e == FTP_EPASSIVE_MODE)
+				sin4->sin_port = htons(port);
+			else {
+				bcopy(addr, (char *)&sin4->sin_addr, 4);
+				bcopy(addr + 4, (char *)&sin4->sin_port, 2);
+			}
+			break;
+		default:
+			e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
+			break;
+		}
+
+		/* connect to data port */
+		if (verbose)
+			_fetch_info("opening data connection");
+		bindaddr = getenv("FETCH_BIND_ADDRESS");
+		if (bindaddr != NULL && *bindaddr != '\0' &&
+		    _fetch_bind(sd, sa.ss_family, bindaddr) != 0)
+			goto sysouch;
+		if (connect(sd, (struct sockaddr *)&sa, sizeof(struct sockaddr_storage)) == -1)
+			goto sysouch;
+
+		/* make the server initiate the transfer */
+		if (verbose)
+			_fetch_info("initiating transfer");
+		e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename);
+		if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
+			goto ouch;
+
+	} else {
+		u_int32_t a;
+		u_short p;
+		int d;
+#ifdef IPV6_PORTRANGE
+        int arg;
+#endif
+		char *ap;
+		char hname[INET6_ADDRSTRLEN];
+
+		switch (sa.ss_family) {
+		case AF_INET6:
+			((struct sockaddr_in6 *)&sa)->sin6_port = 0;
+#ifdef IPV6_PORTRANGE
+			arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH;
+			if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
+				(char *)&arg, sizeof(arg)) == -1)
+				goto sysouch;
+#endif
+			break;
+		case AF_INET:
+			((struct sockaddr_in *)&sa)->sin_port = 0;
+#ifdef IP_PORTRANGE
+			arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH;
+			if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
+				(char *)&arg, sizeof(arg)) == -1)
+				goto sysouch;
+#endif
+			break;
+		}
+		if (verbose)
+			_fetch_info("binding data socket");
+		if (bind(sd, (struct sockaddr *)&sa, sizeof(struct sockaddr_storage)) == -1)
+			goto sysouch;
+		if (listen(sd, 1) == -1)
+			goto sysouch;
+
+		/* find what port we're on and tell the server */
+		if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1)
+			goto sysouch;
+		switch (sa.ss_family) {
+		case AF_INET:
+			sin4 = (struct sockaddr_in *)&sa;
+			a = ntohl(sin4->sin_addr.s_addr);
+			p = ntohs(sin4->sin_port);
+			e = _ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d",
+			    (a >> 24) & 0xff, (a >> 16) & 0xff,
+			    (a >> 8) & 0xff, a & 0xff,
+			    (p >> 8) & 0xff, p & 0xff);
+			break;
+		case AF_INET6:
+#define UC(b)	(((int)b)&0xff)
+			e = -1;
+			sin6 = (struct sockaddr_in6 *)&sa;
+			sin6->sin6_scope_id = 0;
+			if (getnameinfo((struct sockaddr *)&sa,sizeof(struct sockaddr_storage),
+				hname, sizeof(hname),
+				NULL, 0, NI_NUMERICHOST) == 0) {
+				e = _ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname,
+				    htons(sin6->sin6_port));
+				if (e == -1)
+					goto ouch;
+			}
+			if (e != FTP_OK) {
+				ap = (char *)&sin6->sin6_addr;
+				e = _ftp_cmd(conn,
+				    "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
+				    6, 16,
+				    UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
+				    UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
+				    UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
+				    UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
+				    2,
+				    (ntohs(sin6->sin6_port) >> 8) & 0xff,
+				    ntohs(sin6->sin6_port)        & 0xff);
+			}
+			break;
+		default:
+			e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
+			goto ouch;
+		}
+		if (e != FTP_OK)
+			goto ouch;
+
+		/* seek to required offset */
+		if (offset)
+			if (_ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK)
+				goto sysouch;
+
+		/* make the server initiate the transfer */
+		if (verbose)
+			_fetch_info("initiating transfer");
+		e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename);
+		if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
+			goto ouch;
+
+		/* accept the incoming connection and go to town */
+		if ((d = accept(sd, NULL, NULL)) == -1)
+			goto sysouch;
+		close(sd);
+		sd = d;
+	}
+
+	if ((df = _ftp_setup(conn, _fetch_reopen(sd), mode)) == NULL)
+		goto sysouch;
+	return (df);
+
+sysouch:
+	_fetch_syserr();
+	if (sd >= 0)
+		close(sd);
+	return (NULL);
+
+ouch:
+	if (e != -1)
+		_ftp_seterr(e);
+	if (sd >= 0)
+		close(sd);
+	return (NULL);
+}
+
+/*
+ * Authenticate
+ */
+static int
+_ftp_authenticate(conn_t *conn, struct url *url, struct url *purl)
+{
+	const char *user, *pwd, *logname;
+	char pbuf[MAXHOSTNAMELEN + MAXPATHLEN + 1];
+	int e, len;
+
+	/* XXX FTP_AUTH, and maybe .netrc */
+
+	/* send user name and password */
+	if (url->user[0] == '\0')
+		_fetch_netrc_auth(url);
+	user = url->user;
+	if (*user == '\0')
+		user = getenv("FTP_LOGIN");
+	if (user == NULL || *user == '\0')
+		user = FTP_ANONYMOUS_USER;
+	if (purl && url->port == _fetch_default_port(url->scheme))
+		e = _ftp_cmd(conn, "USER %s@%s", user, url->host);
+	else if (purl)
+		e = _ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port);
+	else
+		e = _ftp_cmd(conn, "USER %s", user);
+
+	/* did the server request a password? */
+	if (e == FTP_NEED_PASSWORD) {
+		pwd = url->pwd;
+		if (*pwd == '\0')
+			pwd = getenv("FTP_PASSWORD");
+		if (pwd == NULL || *pwd == '\0') {
+			if ((logname = getlogin()) == 0)
+				logname = FTP_ANONYMOUS_USER;
+			if ((len = snprintf(pbuf, MAXPATHLEN + 1, "%s@", logname)) < 0)
+				len = 0;
+			else if (len > MAXPATHLEN)
+				len = MAXPATHLEN;
+			gethostname(pbuf + len, sizeof(pbuf) - len);
+			pwd = pbuf;
+		}
+		e = _ftp_cmd(conn, "PASS %s", pwd);
+	}
+
+	return (e);
+}
+
+/*
+ * Log on to FTP server
+ */
+static conn_t *
+_ftp_connect(struct url *url, struct url *purl, const char *flags)
+{
+	conn_t *conn;
+	int e, direct, verbose;
+#ifdef INET6
+	int af = AF_UNSPEC;
+#else
+	int af = AF_INET;
+#endif
+
+	direct = CHECK_FLAG('d');
+	verbose = CHECK_FLAG('v');
+	if (CHECK_FLAG('4'))
+		af = AF_INET;
+	else if (CHECK_FLAG('6'))
+		af = AF_INET6;
+
+	if (direct)
+		purl = NULL;
+
+	/* check for proxy */
+	if (purl) {
+		/* XXX proxy authentication! */
+		conn = _fetch_connect(purl->host, purl->port, af, verbose);
+	} else {
+		/* no proxy, go straight to target */
+		conn = _fetch_connect(url->host, url->port, af, verbose);
+		purl = NULL;
+	}
+
+	/* check connection */
+	if (conn == NULL)
+		/* _fetch_connect() has already set an error code */
+		return (NULL);
+
+	/* expect welcome message */
+	if ((e = _ftp_chkerr(conn)) != FTP_SERVICE_READY)
+		goto fouch;
+
+	/* authenticate */
+	if ((e = _ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN)
+		goto fouch;
+
+	/* done */
+	return (conn);
+
+fouch:
+	if (e != -1)
+		_ftp_seterr(e);
+	_fetch_close(conn);
+	return (NULL);
+}
+
+/*
+ * Disconnect from server
+ */
+static void
+_ftp_disconnect(conn_t *conn)
+{
+	(void)_ftp_cmd(conn, "QUIT");
+	if (conn == cached_connection && conn->ref == 1)
+		cached_connection = NULL;
+	_fetch_close(conn);
+}
+
+/*
+ * Check if we're already connected
+ */
+static int
+_ftp_isconnected(struct url *url)
+{
+	return (cached_connection
+	    && (strcmp(url->host, cached_host.host) == 0)
+	    && (strcmp(url->user, cached_host.user) == 0)
+	    && (strcmp(url->pwd, cached_host.pwd) == 0)
+	    && (url->port == cached_host.port));
+}
+
+/*
+ * Check the cache, reconnect if no luck
+ */
+static conn_t *
+_ftp_cached_connect(struct url *url, struct url *purl, const char *flags)
+{
+	conn_t *conn;
+	int e;
+
+	/* set default port */
+	if (!url->port)
+		url->port = _fetch_default_port(url->scheme);
+
+	/* try to use previously cached connection */
+	if (_ftp_isconnected(url)) {
+		e = _ftp_cmd(cached_connection, "NOOP");
+		if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
+			return (_fetch_ref(cached_connection));
+	}
+
+	/* connect to server */
+	if ((conn = _ftp_connect(url, purl, flags)) == NULL)
+		return (NULL);
+	if (cached_connection)
+		_ftp_disconnect(cached_connection);
+	cached_connection = _fetch_ref(conn);
+	memcpy(&cached_host, url, sizeof(*url));
+	return (conn);
+}
+
+/*
+ * Check the proxy settings
+ */
+static struct url *
+_ftp_get_proxy(const char *flags)
+{
+	struct url *purl;
+	char *p;
+
+	if (flags != NULL && strchr(flags, 'd') != NULL)
+		return (NULL);
+	if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) ||
+		(p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
+	    *p && (purl = fetchParseURL(p)) != NULL) {
+		if (!*purl->scheme) {
+			if (getenv("FTP_PROXY") || getenv("ftp_proxy"))
+				strcpy(purl->scheme, SCHEME_FTP);
+			else
+				strcpy(purl->scheme, SCHEME_HTTP);
+		}
+		if (!purl->port)
+			purl->port = _fetch_default_proxy_port(purl->scheme);
+		if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 ||
+		    strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
+			return (purl);
+		fetchFreeURL(purl);
+	}
+	return (NULL);
+}
+
+/*
+ * Process an FTP request
+ */
+FILE *
+_ftp_request(struct url *url, const char *op, struct url_stat *us,
+    struct url *purl, const char *flags)
+{
+	conn_t *conn;
+	int oflag;
+
+	/* check if we should use HTTP instead */
+	if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) {
+		if (strcmp(op, "STAT") == 0)
+			return (_http_request(url, "HEAD", us, purl, flags));
+		else if (strcmp(op, "RETR") == 0)
+			return (_http_request(url, "GET", us, purl, flags));
+		/*
+		 * Our HTTP code doesn't support PUT requests yet, so try
+		 * a direct connection.
+		 */
+	}
+
+	/* connect to server */
+	conn = _ftp_cached_connect(url, purl, flags);
+	if (purl)
+		fetchFreeURL(purl);
+	if (conn == NULL)
+		return (NULL);
+
+	/* change directory */
+	if (_ftp_cwd(conn, url->doc) == -1)
+		return (NULL);
+
+	/* stat file */
+	if (us && _ftp_stat(conn, url->doc, us) == -1
+	    && fetchLastErrCode != FETCH_PROTO
+	    && fetchLastErrCode != FETCH_UNAVAIL)
+		return (NULL);
+
+	/* just a stat */
+	if (strcmp(op, "STAT") == 0)
+		return (FILE *)1; /* bogus return value */
+	if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0)
+		oflag = O_WRONLY;
+	else
+		oflag = O_RDONLY;
+
+	/* initiate the transfer */
+	return (_ftp_transfer(conn, op, url->doc, oflag, url->offset, flags));
+}
+
+/*
+ * Get and stat file
+ */
+FILE *
+fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags)
+{
+	return (_ftp_request(url, "RETR", us, _ftp_get_proxy(flags), flags));
+}
+
+/*
+ * Get file
+ */
+FILE *
+fetchGetFTP(struct url *url, const char *flags)
+{
+	return (fetchXGetFTP(url, NULL, flags));
+}
+
+/*
+ * Put file
+ */
+FILE *
+fetchPutFTP(struct url *url, const char *flags)
+{
+
+	return (_ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL,
+	    _ftp_get_proxy(flags), flags));
+}
+
+/*
+ * Get file stats
+ */
+int
+fetchStatFTP(struct url *url, struct url_stat *us, const char *flags)
+{
+	FILE *f;
+
+	f = _ftp_request(url, "STAT", us, _ftp_get_proxy(flags), flags);
+	if (f == NULL)
+		return (-1);
+	return (0);
+}
+
+/*
+ * List a directory
+ */
+struct url_ent *
+fetchListFTP(struct url *url, const char *flags)
+{
+	warnx("fetchListFTP(): not implemented");
+	return (NULL);
+}