freebsd-dev/lib/libfetch/ftp.c
1998-12-21 19:41:50 +00:00

521 lines
12 KiB
C

/*-
* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
* 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 1.11 1998/12/18 14:32:48 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 Coïdan Smørgrav
* 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/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <ctype.h>
#include <stdarg.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 "ftp"
#define FTP_ANONYMOUS_PASSWORD "ftp"
#define FTP_DEFAULT_PORT 21
#define FTP_OPEN_DATA_CONNECTION 150
#define FTP_OK 200
#define FTP_FILE_STATUS 213
#define FTP_SERVICE_READY 220
#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 struct url cached_host;
static FILE *cached_socket;
static char _ftp_last_reply[1024];
/*
* Get server response, check that first digit is a '2'
*/
static int
_ftp_chkerr(FILE *s)
{
char *line;
size_t len;
do {
if (((line = fgetln(s, &len)) == NULL) || (len < 4)) {
_fetch_syserr();
return -1;
}
} while (len >= 4 && line[3] == '-');
while (len && isspace(line[len-1]))
len--;
snprintf(_ftp_last_reply, sizeof(_ftp_last_reply),
"%*.*s", (int)len, (int)len, line);
#ifndef NDEBUG
fprintf(stderr, "\033[1m<<< ");
fprintf(stderr, "%*.*s\n", (int)len, (int)len, line);
fprintf(stderr, "\033[m");
#endif
if (len < 4 || !isdigit(line[1]) || !isdigit(line[1])
|| !isdigit(line[2]) || (line[3] != ' ')) {
return -1;
}
return (line[0] - '0') * 100 + (line[1] - '0') * 10 + (line[2] - '0');
}
/*
* Send a command and check reply
*/
static int
_ftp_cmd(FILE *f, char *fmt, ...)
{
va_list ap;
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);
return _ftp_chkerr(f);
}
/*
* Transfer file
*/
static FILE *
_ftp_transfer(FILE *cf, char *oper, char *file, char *mode, int pasv)
{
struct sockaddr_in sin;
int e, sd = -1, l;
char *s;
FILE *df;
/* change directory */
if (((s = strrchr(file, '/')) != NULL) && (s != file)) {
*s = 0;
if ((e = _ftp_cmd(cf, "CWD %s" ENDL, file)) != FTP_FILE_ACTION_OK) {
*s = '/';
_ftp_seterr(e);
return NULL;
}
*s++ = '/';
} else {
if ((e = _ftp_cmd(cf, "CWD /" ENDL)) != FTP_FILE_ACTION_OK) {
_ftp_seterr(e);
return NULL;
}
}
/* s now points to file name */
/* open data socket */
if ((sd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
_fetch_syserr();
return NULL;
}
if (pasv) {
u_char addr[6];
char *ln, *p;
int i;
/* send PASV command */
if ((e = _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) == -1)
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)) == -1)
goto sysouch;
/* make the server initiate the transfer */
e = _ftp_cmd(cf, "%s %s" ENDL, oper, s);
if (e != 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) == -1)
goto sysouch;
sin.sin_port = 0;
if (bind(sd, (struct sockaddr *)&sin, l) == -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 *)&sin, &l) == -1)
goto sysouch;
a = ntohl(sin.sin_addr.s_addr);
p = ntohs(sin.sin_port);
e = _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);
if (e != FTP_OK)
goto ouch;
/* make the server initiate the transfer */
e = _ftp_cmd(cf, "%s %s" ENDL, oper, s);
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 = fdopen(sd, mode)) == NULL)
goto sysouch;
return df;
sysouch:
_fetch_syserr();
close(sd);
return NULL;
ouch:
_ftp_seterr(e);
close(sd);
return NULL;
}
/*
* Log on to FTP server
*/
static FILE *
_ftp_connect(char *host, int port, char *user, char *pwd, int verbose)
{
int sd, e, pp = FTP_DEFAULT_PORT;
char *p, *q;
FILE *f;
/* check for proxy */
if ((p = getenv("FTP_PROXY")) != NULL) {
if ((q = strchr(p, ':')) != NULL) {
/* XXX check that it's a valid number */
pp = atoi(q+1);
}
if (q)
*q = 0;
sd = _fetch_connect(p, pp, verbose);
if (q)
*q = ':';
} else {
/* no proxy, go straight to target */
sd = _fetch_connect(host, port, verbose);
}
/* check connection */
if (sd == -1) {
_fetch_syserr();
return NULL;
}
/* streams make life easier */
if ((f = fdopen(sd, "r+")) == NULL) {
_fetch_syserr();
close(sd);
return NULL;
}
/* expect welcome message */
if ((e = _ftp_chkerr(f)) != FTP_SERVICE_READY)
goto fouch;
/* send user name and password */
if (!user || !*user)
user = FTP_ANONYMOUS_USER;
e = p ? _ftp_cmd(f, "USER %s@%s@%d" ENDL, user, host, port)
: _ftp_cmd(f, "USER %s" ENDL, user);
/* did the server request a password? */
if (e == FTP_NEED_PASSWORD) {
if (!pwd || !*pwd)
pwd = FTP_ANONYMOUS_PASSWORD;
e = _ftp_cmd(f, "PASS %s" ENDL, pwd);
}
/* did the server request an account? */
if (e == FTP_NEED_ACCOUNT)
goto fouch;
/* we should be done by now */
if (e != FTP_LOGGED_IN)
goto fouch;
/* might as well select mode and type at once */
#ifdef FTP_FORCE_STREAM_MODE
if ((e = _ftp_cmd(f, "MODE S" ENDL)) != FTP_OK) /* default is S */
goto fouch;
#endif
if ((e = _ftp_cmd(f, "TYPE I" ENDL)) != FTP_OK) /* default is A */
goto fouch;
/* done */
return f;
fouch:
_ftp_seterr(e);
fclose(f);
return NULL;
}
/*
* Disconnect from server
*/
static void
_ftp_disconnect(FILE *f)
{
(void)_ftp_cmd(f, "QUIT" ENDL);
fclose(f);
}
/*
* Check if we're already connected
*/
static int
_ftp_isconnected(struct url *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));
}
/*
* Check the cache, reconnect if no luck
*/
static FILE *
_ftp_cached_connect(struct url *url, char *flags)
{
FILE *cf;
cf = NULL;
/* set default port */
if (!url->port)
url->port = FTP_DEFAULT_PORT;
/* try to use previously cached connection */
if (_ftp_isconnected(url))
if (_ftp_cmd(cached_socket, "NOOP" ENDL) != -1)
cf = cached_socket;
/* connect to server */
if (!cf) {
cf = _ftp_connect(url->host, url->port, url->user, url->pwd,
(strchr(flags, 'v') != NULL));
if (!cf)
return NULL;
if (cached_socket)
_ftp_disconnect(cached_socket);
cached_socket = cf;
memcpy(&cached_host, url, sizeof(struct url));
}
return cf;
}
/*
* Get file
*/
FILE *
fetchGetFTP(struct url *url, char *flags)
{
FILE *cf;
/* connect to server */
if ((cf = _ftp_cached_connect(url, flags)) == NULL)
return NULL;
/* initiate the transfer */
return _ftp_transfer(cf, "RETR", url->doc, "r",
(flags && strchr(flags, 'p')));
}
/*
* Put file
*/
FILE *
fetchPutFTP(struct url *url, char *flags)
{
FILE *cf;
/* connect to server */
if ((cf = _ftp_cached_connect(url, flags)) == NULL)
return NULL;
/* initiate the transfer */
return _ftp_transfer(cf, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
url->doc, "w", (flags && strchr(flags, 'p')));
}
/*
* Get file stats
*/
int
fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
{
FILE *cf;
char *ln, *s;
struct tm tm;
time_t t;
int e;
/* connect to server */
if ((cf = _ftp_cached_connect(url, flags)) == NULL)
return -1;
/* change directory */
if (((s = strrchr(url->doc, '/')) != NULL) && (s != url->doc)) {
*s = 0;
if ((e = _ftp_cmd(cf, "CWD %s" ENDL, url->doc)) != FTP_FILE_ACTION_OK) {
*s = '/';
goto ouch;
}
*s++ = '/';
} else {
if ((e = _ftp_cmd(cf, "CWD /" ENDL)) != FTP_FILE_ACTION_OK)
goto ouch;
}
/* s now points to file name */
if (_ftp_cmd(cf, "SIZE %s" ENDL, s) != FTP_FILE_STATUS)
goto ouch;
for (ln = _ftp_last_reply + 4; *ln && isspace(*ln); ln++)
/* nothing */ ;
for (us->size = 0; *ln && isdigit(*ln); ln++)
us->size = us->size * 10 + *ln - '0';
if (*ln && !isspace(*ln)) {
_ftp_seterr(999); /* XXX should signal a FETCH_PROTO error */
return -1;
}
if ((e = _ftp_cmd(cf, "MDTM %s" ENDL, s)) != FTP_FILE_STATUS)
goto ouch;
for (ln = _ftp_last_reply + 4; *ln && isspace(*ln); ln++)
/* nothing */ ;
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:
_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;
}