/*-
* 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 <stdarg.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 FTP_DEFAULT_PORT 21
#define FTP_OPEN_DATA_CONNECTION 150
#define FTP_OK 200
#define FTP_PASSIVE_MODE 227
#define FTP_LOGGED_IN 230
#define FTP_FILE_ACTION_OK 250
#define FTP_NEED_PASSWORD 331
#define FTP_NEED_ACCOUNT 332
#define ENDL "\r\n"
static url_t cached_host;
static FILE *cached_socket;
static char *_ftp_last_reply;
/*
* 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;
if (e)
*e = 0;
do {
if (((line = fgetln(s, &len)) == NULL) || (len < 4)) {
_ftp_syserr();
return -1;
}
} while (line[3] == '-');
_ftp_last_reply = line;
#ifndef NDEBUG
fprintf(stderr, "\033[1m<<< ");
fprintf(stderr, "%*.*s", (int)len, (int)len, line);
fprintf(stderr, "\033[m");
#endif
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;
}
/*
* Send a command and check reply
*/
static int
_ftp_cmd(FILE *f, char *fmt, ...)
{
va_list ap;
int e;
va_start(ap, fmt);
vfprintf(f, fmt, ap);
#ifndef NDEBUG
fprintf(stderr, "\033[1m>>> ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\033[m");
#endif
va_end(ap);
_ftp_chkerr(f, &e);
return e;
}
/*
* Retrieve file
*/
static FILE *
_ftp_retrieve(FILE *cf, char *file, int pasv)
{
struct sockaddr_in sin;
int sd = -1, l;
char *s;
FILE *df;
/* change directory */
if (((s = strrchr(file, '/')) != NULL) && (s != file)) {
*s = 0;
if (_ftp_cmd(cf, "CWD %s" ENDL, file) != FTP_FILE_ACTION_OK) {
*s = '/';
return NULL;
}
*s++ = '/';
} else {
if (_ftp_cmd(cf, "CWD /" ENDL) != FTP_FILE_ACTION_OK)
return NULL;
}
/* s now points to file name */
/* open data socket */
if ((sd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
_ftp_syserr();
return NULL;
}
if (pasv) {
u_char addr[6];
char *ln, *p;
int i;
/* send PASV command */
if (_ftp_cmd(cf, "PASV" ENDL) != FTP_PASSIVE_MODE)
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 = _ftp_last_reply;
for (p = ln + 3; !isdigit(*p); p++)
/* nothing */ ;
for (p--, i = 0; i < 6; i++) {
p++; /* skip the comma */
addr[i] = strtol(p, &p, 10);
}
/* construct sockaddr for data socket */
l = sizeof(sin);
if (getpeername(fileno(cf), (struct sockaddr *)&sin, &l) < 0)
goto sysouch;
bcopy(addr, (char *)&sin.sin_addr, 4);
bcopy(addr + 4, (char *)&sin.sin_port, 2);
/* connect to data port */
if (connect(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0)
goto sysouch;
/* make the server initiate the transfer */
if (_ftp_cmd(cf, "RETR %s" ENDL, s) != FTP_OPEN_DATA_CONNECTION)
goto ouch;
} else {
u_int32_t a;
u_short p;
int d;
/* find our own address, bind, and listen */
l = sizeof(sin);
if (getsockname(fileno(cf), (struct sockaddr *)&sin, &l) < 0)
goto sysouch;
sin.sin_port = 0;
if (bind(sd, (struct sockaddr *)&sin, l) < 0)
goto sysouch;
if (listen(sd, 1) < 0)
goto sysouch;
/* find what port we're on and tell the server */
if (getsockname(sd, (struct sockaddr *)&sin, &l) < 0)
goto sysouch;
a = ntohl(sin.sin_addr.s_addr);
p = ntohs(sin.sin_port);
if (_ftp_cmd(cf, "PORT %d,%d,%d,%d,%d,%d" ENDL,
(a >> 24) & 0xff, (a >> 16) & 0xff, (a >> 8) & 0xff, a & 0xff,
(p >> 8) & 0xff, p & 0xff) != FTP_OK)
goto ouch;
/* make the server initiate the transfer */
if (_ftp_cmd(cf, "RETR %s" ENDL, s) != FTP_OPEN_DATA_CONNECTION)
goto ouch;
/* accept the incoming connection and go to town */
if ((d = accept(sd, NULL, NULL)) < 0)
goto sysouch;
close(sd);
sd = d;
}
if ((df = fdopen(sd, "r")) == NULL)
goto sysouch;
return df;
sysouch:
_ftp_syserr();
ouch:
close(sd);
return NULL;
}
/*
* Store file
*/
static FILE *
_ftp_store(FILE *cf, char *file, int pasv)
{
fprintf(stderr, "_ftp_store: not implemented yet.\n");
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;
/* 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 */
e = _ftp_cmd(f, "USER %s" ENDL, user);
if (e == FTP_NEED_PASSWORD) /* server requested a password */
e = _ftp_cmd(f, "PASS %s" ENDL, pwd);
if (e == FTP_NEED_ACCOUNT) /* server requested an account */
/* help! */ ;
if (e != FTP_LOGGED_IN) /* won't let us near the WaReZ */
goto fouch;
/* might as well select mode and type at once */
#ifdef FTP_FORCE_STREAM_MODE
if (_ftp_cmd(f, "MODE S" ENDL) != FTP_OK)
goto ouch;
#endif
if (_ftp_cmd(f, "TYPE I" ENDL) != FTP_OK)
goto ouch;
/* done */
return f;
ouch:
close(sd);
return NULL;
fouch:
fclose(f);
return NULL;
}
/*
* Disconnect from server
*/
static void
_ftp_disconnect(FILE *f)
{
_ftp_cmd(f, "QUIT" ENDL);
fclose(f);
}
/*
* Check if we're already connected
*/
static int
_ftp_isconnected(url_t *url)
{
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;
#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 = FTP_DEFAULT_PORT;
/* 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 = htons(FTP_DEFAULT_PORT);
/* 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')));
}