dea29ca1d5
which contains the socket descriptor, the input buffer and (yet unused) SSL state variables. This has the neat side effect of greatly improving reentrance (though we're not *quite* there yet) and opening the door to HTTP connection caching. This commit is inspired by email conversations with and patches from Henry Whincup <henry@techiebod.com> last fall.
1009 lines
22 KiB
C
1009 lines
22 KiB
C
/*-
|
|
* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
|
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* modification, are permitted provided that the following conditions
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* are met:
|
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* 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.
|
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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|
* 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
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|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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|
*/
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|
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|
#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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|
|
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/*
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* Portions of this code were taken from or based on ftpio.c:
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*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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|
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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|
* ----------------------------------------------------------------------------
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*
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|
* Major Changelog:
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*
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|
* Dag-Erling Coïdan Smørgrav
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* 9 Jun 1998
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*
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|
* Incorporated into libfetch
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|
*
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|
* Jordan K. Hubbard
|
|
* 17 Jan 1996
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|
*
|
|
* Turned inside out. Now returns xfers as new file ids, not as a special
|
|
* `state' of FTP_t
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|
*
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|
* $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $
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|
*
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|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
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|
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <errno.h>
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|
#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
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|
#define FTP_OPEN_DATA_CONNECTION 150
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|
#define FTP_OK 200
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|
#define FTP_FILE_STATUS 213
|
|
#define FTP_SERVICE_READY 220
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|
#define FTP_TRANSFER_COMPLETE 226
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|
#define FTP_PASSIVE_MODE 227
|
|
#define FTP_LPASSIVE_MODE 228
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|
#define FTP_EPASSIVE_MODE 229
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|
#define FTP_LOGGED_IN 230
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|
#define FTP_FILE_ACTION_OK 250
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|
#define FTP_NEED_PASSWORD 331
|
|
#define FTP_NEED_ACCOUNT 332
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|
#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]) \
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|
&& isdigit(foo[2]) \
|
|
&& (foo[3] == ' ' || foo[3] == '\0'))
|
|
#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
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|
&& isdigit(foo[2]) && foo[3] == '-')
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|
|
|
/*
|
|
* Translate IPv4 mapped IPv6 address to IPv4 address
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|
*/
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|
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))
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|
return;
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|
sin4 = (struct sockaddr_in *)sin6;
|
|
addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12];
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|
port = sin6->sin6_port;
|
|
memset(sin4, 0, sizeof(struct sockaddr_in));
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|
sin4->sin_addr.s_addr = addr;
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|
sin4->sin_port = port;
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|
sin4->sin_family = AF_INET;
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|
sin4->sin_len = sizeof(struct sockaddr_in);
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|
}
|
|
|
|
/*
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|
* Get server response
|
|
*/
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|
static int
|
|
_ftp_chkerr(conn_t *conn)
|
|
{
|
|
if (_fetch_getln(conn) == -1) {
|
|
_fetch_syserr();
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|
return (-1);
|
|
}
|
|
if (isftpinfo(conn->buf)) {
|
|
while (conn->buflen && !isftpreply(conn->buf)) {
|
|
if (_fetch_getln(conn) == -1) {
|
|
_fetch_syserr();
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|
return (-1);
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|
}
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|
}
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|
}
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|
|
|
while (conn->buflen && isspace(conn->buf[conn->buflen - 1]))
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|
conn->buflen--;
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|
conn->buf[conn->buflen] = '\0';
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|
|
|
if (!isftpreply(conn->buf)) {
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|
_ftp_seterr(FTP_PROTOCOL_ERROR);
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|
return (-1);
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}
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|
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|
conn->err = (conn->buf[0] - '0') * 100
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+ (conn->buf[1] - '0') * 10
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+ (conn->buf[2] - '0');
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|
return (conn->err);
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}
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|
|
/*
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|
* Send a command and check reply
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|
*/
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|
static int
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|
_ftp_cmd(conn_t *conn, const char *fmt, ...)
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|
{
|
|
va_list ap;
|
|
size_t len;
|
|
char *msg;
|
|
int r;
|
|
|
|
va_start(ap, fmt);
|
|
len = vasprintf(&msg, fmt, ap);
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|
va_end(ap);
|
|
|
|
if (msg == NULL) {
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|
errno = ENOMEM;
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|
_fetch_syserr();
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|
return (-1);
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|
}
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|
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|
r = _fetch_putln(conn, msg, len);
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|
free(msg);
|
|
|
|
if (r == -1) {
|
|
_fetch_syserr();
|
|
return (-1);
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|
}
|
|
|
|
return (_ftp_chkerr(conn));
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to the filename part of a path
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|
*/
|
|
static const char *
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|
_ftp_filename(const char *file)
|
|
{
|
|
char *s;
|
|
|
|
if ((s = strrchr(file, '/')) == NULL)
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|
return (file);
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|
else
|
|
return (s + 1);
|
|
}
|
|
|
|
/*
|
|
* Change working directory to the directory that contains the specified
|
|
* file.
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|
*/
|
|
static int
|
|
_ftp_cwd(conn_t *conn, const char *file)
|
|
{
|
|
char *s;
|
|
int e;
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|
|
|
if ((s = strrchr(file, '/')) == NULL || s == file) {
|
|
e = _ftp_cmd(conn, "CWD /");
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|
} else {
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|
e = _ftp_cmd(conn, "CWD %.*s", s - file, file);
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|
}
|
|
if (e != FTP_FILE_ACTION_OK) {
|
|
_ftp_seterr(e);
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Request and parse file stats
|
|
*/
|
|
static int
|
|
_ftp_stat(conn_t *conn, const char *file, struct url_stat *us)
|
|
{
|
|
char *ln;
|
|
const char *s;
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|
struct tm tm;
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|
time_t t;
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|
int e;
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|
us->size = -1;
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us->atime = us->mtime = 0;
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|
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|
if ((s = strrchr(file, '/')) == NULL)
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|
s = file;
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|
else
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|
++s;
|
|
|
|
if ((e = _ftp_cmd(conn, "SIZE %s", s)) != FTP_FILE_STATUS) {
|
|
_ftp_seterr(e);
|
|
return (-1);
|
|
}
|
|
for (ln = conn->buf + 4; *ln && isspace(*ln); ln++)
|
|
/* nothing */ ;
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|
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));
|
|
|
|
if ((e = _ftp_cmd(conn, "MDTM %s", s)) != 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 *conn; /* Control connection */
|
|
int dsd; /* Data socket descriptor */
|
|
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->conn == NULL || io->dsd == -1 || io->dir == O_WRONLY) {
|
|
errno = EBADF;
|
|
return (-1);
|
|
}
|
|
if (io->err) {
|
|
errno = io->err;
|
|
return (-1);
|
|
}
|
|
if (io->eof)
|
|
return (0);
|
|
r = read(io->dsd, 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->conn == NULL || io->dsd == -1 || io->dir == O_RDONLY) {
|
|
errno = EBADF;
|
|
return (-1);
|
|
}
|
|
if (io->err) {
|
|
errno = io->err;
|
|
return (-1);
|
|
}
|
|
w = write(io->dsd, 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 __unused, int whence __unused)
|
|
{
|
|
struct ftpio *io;
|
|
|
|
io = (struct ftpio *)v;
|
|
if (io == NULL) {
|
|
errno = EBADF;
|
|
return (-1);
|
|
}
|
|
errno = ESPIPE;
|
|
return (-1);
|
|
}
|
|
|
|
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->conn == NULL || io->dsd == -1) {
|
|
errno = EBADF;
|
|
return (-1);
|
|
}
|
|
close(io->dsd);
|
|
io->dir = -1;
|
|
io->dsd = -1;
|
|
DEBUG(fprintf(stderr, "Waiting for final status\n"));
|
|
r = _ftp_chkerr(io->conn);
|
|
_fetch_close(io->conn);
|
|
free(io);
|
|
return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1;
|
|
}
|
|
|
|
static FILE *
|
|
_ftp_setup(conn_t *conn, int dsd, int mode)
|
|
{
|
|
struct ftpio *io;
|
|
FILE *f;
|
|
|
|
if ((io = malloc(sizeof *io)) == NULL)
|
|
return (NULL);
|
|
io->conn = conn;
|
|
io->dsd = dsd;
|
|
io->dir = mode;
|
|
io->eof = io->err = 0;
|
|
f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn);
|
|
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;
|
|
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);
|
|
|
|
/* 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");
|
|
if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1)
|
|
goto sysouch;
|
|
|
|
/* make the server initiate the transfer */
|
|
if (verbose)
|
|
_fetch_info("initiating transfer");
|
|
e = _ftp_cmd(conn, "%s %s", oper, _ftp_filename(file));
|
|
if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
|
|
goto ouch;
|
|
|
|
} else {
|
|
u_int32_t a;
|
|
u_short p;
|
|
int arg, d;
|
|
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;
|
|
arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH;
|
|
if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
|
|
(char *)&arg, sizeof arg) == -1)
|
|
goto sysouch;
|
|
break;
|
|
}
|
|
if (verbose)
|
|
_fetch_info("binding data socket");
|
|
if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -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;
|
|
if (getnameinfo((struct sockaddr *)&sa, sa.ss_len,
|
|
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, _ftp_filename(file));
|
|
if (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, 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 + MAXLOGNAME + 1];
|
|
int e, len;
|
|
|
|
/* XXX FTP_AUTH, and maybe .netrc */
|
|
|
|
/* send user name and password */
|
|
user = url->user;
|
|
if (!user || !*user)
|
|
user = getenv("FTP_LOGIN");
|
|
if (!user || !*user)
|
|
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 || !*pwd)
|
|
pwd = getenv("FTP_PASSWORD");
|
|
if (!pwd || !*pwd) {
|
|
if ((logname = getlogin()) == 0)
|
|
logname = FTP_ANONYMOUS_USER;
|
|
if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0)
|
|
len = 0;
|
|
else if (len > MAXLOGNAME)
|
|
len = MAXLOGNAME;
|
|
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_syserr();
|
|
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;
|
|
|
|
/* might as well select mode and type at once */
|
|
#ifdef FTP_FORCE_STREAM_MODE
|
|
if ((e = _ftp_cmd(conn, "MODE S")) != FTP_OK) /* default is S */
|
|
goto fouch;
|
|
#endif
|
|
if ((e = _ftp_cmd(conn, "TYPE I")) != FTP_OK) /* default is A */
|
|
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");
|
|
_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 (cached_connection);
|
|
}
|
|
|
|
/* connect to server */
|
|
if ((conn = _ftp_connect(url, purl, flags)) == NULL)
|
|
return (NULL);
|
|
if (cached_connection)
|
|
_ftp_disconnect(cached_connection);
|
|
cached_connection = conn;
|
|
memcpy(&cached_host, url, sizeof *url);
|
|
return (conn);
|
|
}
|
|
|
|
/*
|
|
* Check the proxy settings
|
|
*/
|
|
static struct url *
|
|
_ftp_get_proxy(void)
|
|
{
|
|
struct url *purl;
|
|
char *p;
|
|
|
|
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));
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* Get file stats
|
|
*/
|
|
int
|
|
fetchStatFTP(struct url *url, struct url_stat *us, const char *flags)
|
|
{
|
|
|
|
if (_ftp_request(url, "STAT", us, _ftp_get_proxy(), flags) == NULL)
|
|
return (-1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* List a directory
|
|
*/
|
|
struct url_ent *
|
|
fetchListFTP(struct url *url __unused, const char *flags __unused)
|
|
{
|
|
warnx("fetchListFTP(): not implemented");
|
|
return (NULL);
|
|
}
|