462 lines
10 KiB
C
462 lines
10 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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* $Id: ftp.c,v 1.3 1998/07/11 21:29:08 des Exp $
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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/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/errno.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.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 <unistd.h>
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#include "fetch.h"
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#include "ftperr.c"
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#define FTP_DEFAULT_TO_ANONYMOUS
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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_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 ENDL "\r\n"
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static url_t cached_host;
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static FILE *cached_socket;
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static char *_ftp_last_reply;
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/*
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* Map error code to string
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*/
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static const char *
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_ftp_errstring(int e)
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{
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struct ftperr *p = _ftp_errlist;
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while ((p->num != -1) && (p->num != e))
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p++;
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return p->string;
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}
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/*
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* Set error code
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*/
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static void
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_ftp_seterr(int e)
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{
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fetchLastErrCode = e;
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fetchLastErrText = _ftp_errstring(e);
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}
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/*
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* Set error code according to errno
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*/
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static void
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_ftp_syserr(void)
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{
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fetchLastErrCode = errno;
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fetchLastErrText = strerror(errno);
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}
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/*
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* Get server response, check that first digit is a '2'
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*/
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static int
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_ftp_chkerr(FILE *s, int *e)
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{
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char *line;
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size_t len;
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if (e)
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*e = 0;
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do {
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if (((line = fgetln(s, &len)) == NULL) || (len < 4)) {
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_ftp_syserr();
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return -1;
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}
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} while (line[3] == '-');
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_ftp_last_reply = line;
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#ifndef NDEBUG
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fprintf(stderr, "\033[1m<<< ");
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fprintf(stderr, "%*.*s", (int)len, (int)len, line);
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fprintf(stderr, "\033[m");
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#endif
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if (!isdigit(line[1]) || !isdigit(line[1])
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|| !isdigit(line[2]) || (line[3] != ' ')) {
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_ftp_seterr(-1);
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return -1;
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}
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_ftp_seterr((line[0] - '0') * 100 + (line[1] - '0') * 10 + (line[2] - '0'));
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if (e)
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*e = fetchLastErrCode;
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return (line[0] == '2') - 1;
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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(FILE *f, char *fmt, ...)
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{
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va_list ap;
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int e;
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va_start(ap, fmt);
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vfprintf(f, fmt, ap);
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#ifndef NDEBUG
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fprintf(stderr, "\033[1m>>> ");
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\033[m");
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#endif
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va_end(ap);
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_ftp_chkerr(f, &e);
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return e;
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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(FILE *cf, char *oper, char *file, char *mode, int pasv)
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{
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struct sockaddr_in sin;
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int sd = -1, l;
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char *s;
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FILE *df;
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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 (_ftp_cmd(cf, "CWD %s" ENDL, file) != FTP_FILE_ACTION_OK) {
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*s = '/';
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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 (_ftp_cmd(cf, "CWD /" ENDL) != FTP_FILE_ACTION_OK)
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return NULL;
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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)) < 0) {
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_ftp_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 (_ftp_cmd(cf, "PASV" ENDL) != FTP_PASSIVE_MODE)
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goto ouch;
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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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ln = _ftp_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(fileno(cf), (struct sockaddr *)&sin, &l) < 0)
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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 (connect(sd, (struct sockaddr *)&sin, sizeof(sin)) < 0)
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goto sysouch;
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/* make the server initiate the transfer */
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if (_ftp_cmd(cf, "%s %s" ENDL, oper, s) != 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 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(fileno(cf), (struct sockaddr *)&sin, &l) < 0)
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goto sysouch;
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sin.sin_port = 0;
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if (bind(sd, (struct sockaddr *)&sin, l) < 0)
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goto sysouch;
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if (listen(sd, 1) < 0)
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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) < 0)
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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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if (_ftp_cmd(cf, "PORT %d,%d,%d,%d,%d,%d" ENDL,
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(a >> 24) & 0xff, (a >> 16) & 0xff, (a >> 8) & 0xff, a & 0xff,
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(p >> 8) & 0xff, p & 0xff) != FTP_OK)
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goto ouch;
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/* make the server initiate the transfer */
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if (_ftp_cmd(cf, "%s %s" ENDL, oper, s) != 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)) < 0)
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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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_ftp_syserr();
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ouch:
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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 FILE *
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_ftp_connect(char *host, int port, char *user, char *pwd)
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{
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int sd, e, pp = FTP_DEFAULT_PORT;
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char *p, *q;
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FILE *f;
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/* check for proxy */
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if ((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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sd = fetchConnect(p, pp);
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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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sd = fetchConnect(host, port);
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}
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/* check connection */
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if (sd < 0) {
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_ftp_syserr();
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return NULL;
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}
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/* streams make life easier */
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if ((f = fdopen(sd, "r+")) == NULL) {
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_ftp_syserr();
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goto ouch;
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}
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/* expect welcome message */
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if (_ftp_chkerr(f, NULL) < 0)
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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(f, "USER %s@%s@%d" ENDL, user, host, port)
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: _ftp_cmd(f, "USER %s" ENDL, 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(f, "PASS %s" ENDL, 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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/* help! */ ;
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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 (_ftp_cmd(f, "MODE S" ENDL) != FTP_OK) /* default is S */
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goto ouch;
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#endif
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if (_ftp_cmd(f, "TYPE I" ENDL) != FTP_OK) /* default is A */
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goto ouch;
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/* done */
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return f;
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ouch:
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close(sd);
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return NULL;
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fouch:
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fclose(f);
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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(FILE *f)
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{
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_ftp_cmd(f, "QUIT" ENDL);
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fclose(f);
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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(url_t *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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* FTP session
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*/
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static FILE *
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fetchXxxFTP(url_t *url, char *oper, char *mode, char *flags)
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{
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FILE *cf = NULL;
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int e;
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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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fprintf(cached_socket, "PWD" ENDL);
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_ftp_chkerr(cached_socket, &e);
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if (e > 0)
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cf = cached_socket;
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}
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/* connect to server */
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if (!cf) {
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cf = _ftp_connect(url->host, url->port, url->user, url->pwd);
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if (!cf)
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return NULL;
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if (cached_socket)
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_ftp_disconnect(cached_socket);
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cached_socket = cf;
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memcpy(&cached_host, url, sizeof(url_t));
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}
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/* initiate the transfer */
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return _ftp_transfer(cf, oper, url->doc, mode, (flags && strchr(flags, 'p')));
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}
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/*
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* Itsy bitsy teeny weenie
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*/
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FILE *
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fetchGetFTP(url_t *url, char *flags)
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{
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return fetchXxxFTP(url, "RETR", "r", flags);
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}
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FILE *
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fetchPutFTP(url_t *url, char *flags)
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{
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if (flags && strchr(flags, 'a'))
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return fetchXxxFTP(url, "APPE", "w", flags);
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else return fetchXxxFTP(url, "STOR", "w", flags);
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}
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