/*-
* Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav
* 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.
*
* $Id: ftp.c,v 1.1.1.1 1998/07/09 16:52:42 des Exp $
*/
/*
* Portions of this code were taken from or based on ftpio.c:
*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dknet.dk> 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 Co�dan Sm�rgrav
* 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/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/errno.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "fetch.h"
#include "ftperr.c"
#define FTP_DEFAULT_TO_ANONYMOUS
#define FTP_ANONYMOUS_USER "ftp"
#define FTP_ANONYMOUS_PASSWORD "ftp"
#define ENDL "\r\n"
static url_t cached_host;
static FILE *cached_socket;
#ifndef NDEBUG
#define TRACE fprintf(stderr, "TRACE on line %d in " __FILE__ "\n", __LINE__);
#else
#define TRACE
#endif
/*
* Map error code to string
*/
static const char *
_ftp_errstring(int e)
{
struct ftperr *p = _ftp_errlist;
while ((p->num != -1) && (p->num != e))
p++;
return p->string;
}
/*
* Set error code
*/
static void
_ftp_seterr(int e)
{
fetchLastErrCode = e;
fetchLastErrText = _ftp_errstring(e);
}
/*
* Set error code according to errno
*/
static void
_ftp_syserr(void)
{
fetchLastErrCode = errno;
fetchLastErrText = strerror(errno);
}
/*
* Get server response, check that first digit is a '2'
*/
static int
_ftp_chkerr(FILE *s, int *e)
{
char *line;
size_t len;
TRACE;
if (e)
*e = 0;
do {
if (((line = fgetln(s, &len)) == NULL) || (len < 4))
{
_ftp_syserr();
return -1;
}
} while (line[3] == '-');
if (!isdigit(line[1]) || !isdigit(line[1])
|| !isdigit(line[2]) || (line[3] != ' ')) {
_ftp_seterr(-1);
return -1;
}
_ftp_seterr((line[0] - '0') * 100 + (line[1] - '0') * 10 + (line[2] - '0'));
if (e)
*e = fetchLastErrCode;
return (line[0] == '2') - 1;
}
/*
* Change remote working directory
*/
static int
_ftp_cwd(FILE *s, char *dir)
{
TRACE;
fprintf(s, "CWD %s\n", dir);
if (ferror(s)) {
_ftp_syserr();
return -1;
}
return _ftp_chkerr(s, NULL); /* expecting 250 */
}
/*
* Retrieve file
*/
static FILE *
_ftp_retrieve(FILE *cf, char *file, int pasv)
{
char *p;
TRACE;
/* change directory */
if (((p = strrchr(file, '/')) != NULL) && (p != file)) {
*p = 0;
if (_ftp_cwd(cf, file) < 0) {
*p = '/';
return NULL;
}
*p++ = '/';
} else {
if (_ftp_cwd(cf, "/") < 0)
return NULL;
}
/* retrieve file; p now points to file name */
fprintf(stderr, "Arrrgh! No! No! I can't do it! Leave me alone!\n");
return NULL;
}
/*
* Store file
*/
static FILE *
_ftp_store(FILE *cf, char *file, int pasv)
{
TRACE;
cf = cf;
file = file;
pasv = pasv;
return NULL;
}
/*
* Log on to FTP server
*/
static FILE *
_ftp_connect(char *host, int port, char *user, char *pwd)
{
int sd, e;
FILE *f;
TRACE;
/* establish control connection */
if ((sd = fetchConnect(host, port)) < 0) {
_ftp_syserr();
return NULL;
}
if ((f = fdopen(sd, "r+")) == NULL) {
_ftp_syserr();
goto ouch;
}
/* expect welcome message */
if (_ftp_chkerr(f, NULL) < 0)
goto fouch;
/* send user name and password */
fprintf(f, "USER %s" ENDL, user);
_ftp_chkerr(f, &e);
if (e == 331) {
/* server requested a password */
fprintf(f, "PASS %s" ENDL, pwd);
_ftp_chkerr(f, &e);
}
if (e == 332) {
/* server requested an account */
}
if (e != 230) /* won't let us near the WaReZ */
goto fouch;
/* might as well select mode and type at once */
#ifdef FTP_FORCE_STREAM_MODE
fprintf(f, "MODE S" ENDL);
if (_ftp_chkerr(f, NULL) < 0)
goto ouch;
#endif
fprintf(f, "TYPE I" ENDL);
if (_ftp_chkerr(f, NULL) < 0)
goto ouch;
/* done */
return f;
ouch:
close(sd);
return NULL;
fouch:
fclose(f);
return NULL;
}
/*
* Disconnect from server
*/
static void
_ftp_disconnect(FILE *f)
{
TRACE;
fprintf(f, "QUIT" ENDL);
_ftp_chkerr(f, NULL);
fclose(f);
}
/*
* Check if we're already connected
*/
static int
_ftp_isconnected(url_t *url)
{
TRACE;
return (cached_socket
&& (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));
}
FILE *
fetchGetFTP(url_t *url, char *flags)
{
FILE *cf = NULL;
int e;
TRACE;
#ifdef DEFAULT_TO_ANONYMOUS
if (!url->user[0]) {
strcpy(url->user, FTP_ANONYMOUS_USER);
strcpy(url->pwd, FTP_ANONYMOUS_PASSWORD);
}
#endif
/* set default port */
if (!url->port)
url->port = 21;
/* try to use previously cached connection */
if (_ftp_isconnected(url)) {
fprintf(cached_socket, "PWD" ENDL);
_ftp_chkerr(cached_socket, &e);
if (e > 0)
cf = cached_socket;
}
/* connect to server */
if (!cf) {
cf = _ftp_connect(url->host, url->port, url->user, url->pwd);
if (!cf)
return NULL;
if (cached_socket)
_ftp_disconnect(cached_socket);
cached_socket = cf;
memcpy(&cached_host, url, sizeof(url_t));
}
/* initiate the transfer */
return _ftp_retrieve(cf, url->doc, (flags && strchr(flags, 'p')));
}
/*
* Upload a file.
* Hmmm, that's almost an exact duplicate of the above...
*/
FILE *
fetchPutFTP(url_t *url, char *flags)
{
FILE *cf = NULL;
int e;
#ifdef DEFAULT_TO_ANONYMOUS
if (!url->user[0]) {
strcpy(url->user, FTP_ANONYMOUS_USER);
strcpy(url->pwd, FTP_ANONYMOUS_PASSWORD);
}
#endif
/* set default port */
if (!url->port)
url->port = 21;
/* try to use previously cached connection */
if (_ftp_isconnected(url)) {
fprintf(cached_socket, "PWD" ENDL);
_ftp_chkerr(cached_socket, &e);
if (e > 0)
cf = cached_socket;
}
/* connect to server */
if (!cf) {
cf = _ftp_connect(url->host, url->port, url->user, url->pwd);
if (!cf)
return NULL;
if (cached_socket)
_ftp_disconnect(cached_socket);
cached_socket = cf;
memcpy(&cached_host, url, sizeof(url_t));
}
/* initiate the transfer */
return _ftp_store(cf, url->doc, (flags && strchr(flags, 'p')));
}