572 lines
13 KiB
C
572 lines
13 KiB
C
/*-
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* 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
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* 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
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* 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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* $FreeBSD$
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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@login.dknet.dk> 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
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* 17 Jan 1996
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*
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* Turned inside out. Now returns xfers as new file ids, not as a special
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* `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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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "fetch.h"
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#include "common.h"
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#include "ftperr.h"
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#define FTP_ANONYMOUS_USER "ftp"
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#define FTP_ANONYMOUS_PASSWORD "ftp"
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#define FTP_DEFAULT_PORT 21
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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
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#define FTP_SERVICE_READY 220
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#define FTP_PASSIVE_MODE 227
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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
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#define FTP_NEED_ACCOUNT 332
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#define FTP_SYNTAX_ERROR 500
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static char ENDL[2] = "\r\n";
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static struct url cached_host;
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static int cached_socket;
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static char *last_reply;
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static size_t lr_size, lr_length;
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static int last_code;
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#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
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&& isdigit(foo[2]) && foo[3] == ' ')
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#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
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&& isdigit(foo[2]) && foo[3] == '-')
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/*
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* Get server response
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*/
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static int
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_ftp_chkerr(int cd)
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{
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do {
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if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
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_fetch_syserr();
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return -1;
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}
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#ifndef NDEBUG
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_fetch_info("got reply '%.*s'", lr_length - 2, last_reply);
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#endif
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} while (isftpinfo(last_reply));
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while (lr_length && isspace(last_reply[lr_length-1]))
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lr_length--;
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last_reply[lr_length] = 0;
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if (!isftpreply(last_reply)) {
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_ftp_seterr(999);
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return -1;
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}
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last_code = (last_reply[0] - '0') * 100
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+ (last_reply[1] - '0') * 10
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+ (last_reply[2] - '0');
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return last_code;
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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(int cd, char *fmt, ...)
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{
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va_list ap;
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struct iovec iov[2];
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char *msg;
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int r;
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va_start(ap, fmt);
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vasprintf(&msg, fmt, ap);
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va_end(ap);
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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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#ifndef NDEBUG
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_fetch_info("sending '%s'", msg);
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#endif
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iov[0].iov_base = msg;
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iov[0].iov_len = strlen(msg);
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iov[1].iov_base = ENDL;
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iov[1].iov_len = sizeof(ENDL);
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r = writev(cd, iov, 2);
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free(msg);
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if (r == -1) {
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_fetch_syserr();
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return -1;
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}
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return _ftp_chkerr(cd);
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}
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/*
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* Transfer file
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*/
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static FILE *
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_ftp_transfer(int cd, char *oper, char *file, char *mode, char *flags)
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{
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struct sockaddr_in sin;
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int pasv, high, verbose;
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int e, sd = -1;
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socklen_t l;
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char *s;
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FILE *df;
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/* check flags */
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pasv = (flags && strchr(flags, 'p'));
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high = (flags && strchr(flags, 'h'));
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verbose = (flags && strchr(flags, 'v'));
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/* change directory */
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if (((s = strrchr(file, '/')) != NULL) && (s != file)) {
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*s = 0;
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if (verbose)
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_fetch_info("changing directory to %s", file);
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if ((e = _ftp_cmd(cd, "CWD %s", file)) != FTP_FILE_ACTION_OK) {
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*s = '/';
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if (e != -1)
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_ftp_seterr(e);
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return NULL;
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}
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*s++ = '/';
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} else {
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if (verbose)
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_fetch_info("changing directory to /");
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if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK) {
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if (e != -1)
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_ftp_seterr(e);
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return NULL;
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}
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}
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/* s now points to file name */
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/* open data socket */
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if ((sd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
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_fetch_syserr();
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return NULL;
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}
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if (pasv) {
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u_char addr[6];
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char *ln, *p;
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int i;
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/* send PASV command */
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if (verbose)
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_fetch_info("setting passive mode");
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if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
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goto ouch;
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/*
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* Find address and port number. The reply to the PASV command
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* is IMHO the one and only weak point in the FTP protocol.
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*/
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ln = last_reply;
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for (p = ln + 3; !isdigit(*p); p++)
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/* nothing */ ;
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for (p--, i = 0; i < 6; i++) {
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p++; /* skip the comma */
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addr[i] = strtol(p, &p, 10);
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}
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/* construct sockaddr for data socket */
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l = sizeof(sin);
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if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
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goto sysouch;
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bcopy(addr, (char *)&sin.sin_addr, 4);
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bcopy(addr + 4, (char *)&sin.sin_port, 2);
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/* connect to data port */
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if (verbose)
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_fetch_info("opening data connection");
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if (connect(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1)
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goto sysouch;
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/* make the server initiate the transfer */
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if (verbose)
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_fetch_info("initiating transfer");
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e = _ftp_cmd(cd, "%s %s", oper, s);
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if (e != FTP_OPEN_DATA_CONNECTION)
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goto ouch;
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} else {
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u_int32_t a;
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u_short p;
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int arg, d;
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/* find our own address, bind, and listen */
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l = sizeof(sin);
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if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
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goto sysouch;
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sin.sin_port = 0;
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arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
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if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
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(char *)&arg, sizeof(arg)) == -1)
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goto sysouch;
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if (verbose)
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_fetch_info("binding data socket");
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if (bind(sd, (struct sockaddr *)&sin, l) == -1)
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goto sysouch;
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if (listen(sd, 1) == -1)
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goto sysouch;
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/* find what port we're on and tell the server */
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if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
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goto sysouch;
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a = ntohl(sin.sin_addr.s_addr);
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p = ntohs(sin.sin_port);
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e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
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(a >> 24) & 0xff, (a >> 16) & 0xff,
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(a >> 8) & 0xff, a & 0xff,
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(p >> 8) & 0xff, p & 0xff);
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if (e != FTP_OK)
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goto ouch;
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/* make the server initiate the transfer */
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if (verbose)
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_fetch_info("initiating transfer");
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e = _ftp_cmd(cd, "%s %s", oper, s);
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if (e != FTP_OPEN_DATA_CONNECTION)
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goto ouch;
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/* accept the incoming connection and go to town */
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if ((d = accept(sd, NULL, NULL)) == -1)
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goto sysouch;
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close(sd);
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sd = d;
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}
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if ((df = fdopen(sd, mode)) == NULL)
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goto sysouch;
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return df;
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sysouch:
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_fetch_syserr();
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close(sd);
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return NULL;
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ouch:
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if (e != -1)
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_ftp_seterr(e);
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close(sd);
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return NULL;
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}
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/*
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* Log on to FTP server
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*/
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static int
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_ftp_connect(char *host, int port, char *user, char *pwd, char *flags)
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{
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int cd, e, pp = FTP_DEFAULT_PORT, direct, verbose;
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char *p, *q;
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direct = (flags && strchr(flags, 'd'));
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verbose = (flags && strchr(flags, 'v'));
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/* check for proxy */
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if (!direct && (p = getenv("FTP_PROXY")) != NULL) {
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if ((q = strchr(p, ':')) != NULL) {
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/* XXX check that it's a valid number */
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pp = atoi(q+1);
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}
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if (q)
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*q = 0;
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cd = _fetch_connect(p, pp, verbose);
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if (q)
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*q = ':';
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} else {
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/* no proxy, go straight to target */
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cd = _fetch_connect(host, port, verbose);
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p = NULL;
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}
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/* check connection */
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if (cd == -1) {
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_fetch_syserr();
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return NULL;
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}
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/* expect welcome message */
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if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
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goto fouch;
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/* send user name and password */
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if (!user || !*user)
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user = FTP_ANONYMOUS_USER;
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e = p ? _ftp_cmd(cd, "USER %s@%s@%d", user, host, port)
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: _ftp_cmd(cd, "USER %s", user);
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/* did the server request a password? */
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if (e == FTP_NEED_PASSWORD) {
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if (!pwd || !*pwd)
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pwd = FTP_ANONYMOUS_PASSWORD;
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e = _ftp_cmd(cd, "PASS %s", pwd);
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}
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/* did the server request an account? */
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if (e == FTP_NEED_ACCOUNT)
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goto fouch;
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/* we should be done by now */
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if (e != FTP_LOGGED_IN)
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goto fouch;
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/* might as well select mode and type at once */
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#ifdef FTP_FORCE_STREAM_MODE
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if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
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goto fouch;
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#endif
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if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
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goto fouch;
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/* done */
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return cd;
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fouch:
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if (e != -1)
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_ftp_seterr(e);
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close(cd);
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return NULL;
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}
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/*
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* Disconnect from server
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*/
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static void
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_ftp_disconnect(int cd)
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{
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(void)_ftp_cmd(cd, "QUIT");
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close(cd);
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}
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/*
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* Check if we're already connected
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*/
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static int
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_ftp_isconnected(struct url *url)
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{
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return (cached_socket
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&& (strcmp(url->host, cached_host.host) == 0)
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&& (strcmp(url->user, cached_host.user) == 0)
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&& (strcmp(url->pwd, cached_host.pwd) == 0)
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&& (url->port == cached_host.port));
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}
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/*
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* Check the cache, reconnect if no luck
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*/
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static int
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_ftp_cached_connect(struct url *url, char *flags)
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{
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int e, cd;
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cd = -1;
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/* set default port */
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if (!url->port)
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url->port = FTP_DEFAULT_PORT;
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/* try to use previously cached connection */
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if (_ftp_isconnected(url)) {
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e = _ftp_cmd(cached_socket, "NOOP");
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if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
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cd = cached_socket;
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}
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/* connect to server */
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if (cd == -1) {
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cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags);
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if (cd == -1)
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return -1;
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if (cached_socket)
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_ftp_disconnect(cached_socket);
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cached_socket = cd;
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memcpy(&cached_host, url, sizeof(struct url));
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}
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return cd;
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}
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/*
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* Get file
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*/
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FILE *
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fetchGetFTP(struct url *url, char *flags)
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{
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int cd;
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/* connect to server */
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if ((cd = _ftp_cached_connect(url, flags)) == NULL)
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return NULL;
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/* initiate the transfer */
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return _ftp_transfer(cd, "RETR", url->doc, "r", flags);
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}
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/*
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* Put file
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*/
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FILE *
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fetchPutFTP(struct url *url, char *flags)
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{
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int cd;
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/* connect to server */
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if ((cd = _ftp_cached_connect(url, flags)) == NULL)
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return NULL;
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/* initiate the transfer */
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return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
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url->doc, "w", flags);
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}
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/*
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* Get file stats
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*/
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int
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fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
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{
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char *ln, *s;
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struct tm tm;
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time_t t;
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int e, cd;
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/* connect to server */
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if ((cd = _ftp_cached_connect(url, flags)) == NULL)
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return -1;
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/* change directory */
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if (((s = strrchr(url->doc, '/')) != NULL) && (s != url->doc)) {
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*s = 0;
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if ((e = _ftp_cmd(cd, "CWD %s", url->doc)) != FTP_FILE_ACTION_OK) {
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*s = '/';
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goto ouch;
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}
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*s++ = '/';
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} else {
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if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK)
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goto ouch;
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}
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/* s now points to file name */
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if (_ftp_cmd(cd, "SIZE %s", s) != FTP_FILE_STATUS)
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goto ouch;
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for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
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/* nothing */ ;
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for (us->size = 0; *ln && isdigit(*ln); ln++)
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us->size = us->size * 10 + *ln - '0';
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if (*ln && !isspace(*ln)) {
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_ftp_seterr(999);
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return -1;
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}
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if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS)
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goto ouch;
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for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
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/* nothing */ ;
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t = time(NULL);
|
|
us->mtime = localtime(&t)->tm_gmtoff;
|
|
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);
|
|
/* XXX should check the return value from sscanf */
|
|
tm.tm_mon--;
|
|
tm.tm_year -= 1900;
|
|
tm.tm_isdst = -1;
|
|
tm.tm_gmtoff = 0;
|
|
us->mtime += mktime(&tm);
|
|
us->atime = us->mtime;
|
|
return 0;
|
|
|
|
ouch:
|
|
if (e != -1)
|
|
_ftp_seterr(e);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* List a directory
|
|
*/
|
|
extern void warnx(char *, ...);
|
|
struct url_ent *
|
|
fetchListFTP(struct url *url, char *flags)
|
|
{
|
|
warnx("fetchListFTP(): not implemented");
|
|
return NULL;
|
|
}
|