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/* $NetBSD: ftp.c,v 1.46 2014/06/11 13:12:12 joerg Exp $ */
/*-
* Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav
* Copyright (c) 2008, 2009, 2010 Joerg Sonnenberger <joerg@NetBSD.org>
* 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.
*
* $FreeBSD: ftp.c,v 1.101 2008/01/23 20:57:59 des Exp $
*/
/*
* Portions of this code were taken from or based on ftpio.c:
*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.org> 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/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdarg.h>
#include <netdb.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"
static int ftp_cmd(conn_t *, const char *, ...) LIBFETCH_PRINTFLIKE(2, 3);
#define FTP_ANONYMOUS_USER "anonymous"
#define FTP_ANONYMOUS_PASSWORD "anonymous"
#define FTP_CONNECTION_ALREADY_OPEN 125
#define FTP_OPEN_DATA_CONNECTION 150
#define FTP_OK 200
#define FTP_FILE_STATUS 213
#define FTP_SERVICE_READY 220
#define FTP_TRANSFER_COMPLETE 226
#define FTP_PASSIVE_MODE 227
#define FTP_LPASSIVE_MODE 228
#define FTP_EPASSIVE_MODE 229
#define FTP_LOGGED_IN 230
#define FTP_FILE_ACTION_OK 250
#define FTP_DIRECTORY_CREATED 257 /* multiple meanings */
#define FTP_FILE_CREATED 257 /* multiple meanings */
#define FTP_WORKING_DIRECTORY 257 /* multiple meanings */
#define FTP_NEED_PASSWORD 331
#define FTP_NEED_ACCOUNT 332
#define FTP_FILE_OK 350
#define FTP_SYNTAX_ERROR 500
#define FTP_PROTOCOL_ERROR 999
#define isftpreply(foo) \
(isdigit((unsigned char)foo[0]) && \
isdigit((unsigned char)foo[1]) && \
isdigit((unsigned char)foo[2]) && \
(foo[3] == ' ' || foo[3] == '\0'))
#define isftpinfo(foo) \
(isdigit((unsigned char)foo[0]) && \
isdigit((unsigned char)foo[1]) && \
isdigit((unsigned char)foo[2]) && \
foo[3] == '-')
/*
* Translate IPv4 mapped IPv6 address to IPv4 address
*/
static void
unmappedaddr(struct sockaddr_in6 *sin6, socklen_t *len)
{
struct sockaddr_in *sin4;
uint32_t addr;
int port;
if (sin6->sin6_family != AF_INET6 ||
!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return;
sin4 = (struct sockaddr_in *)sin6;
#ifdef s6_addr32
addr = sin6->sin6_addr.s6_addr32[3];
#else
memcpy(&addr, &sin6->sin6_addr.s6_addr[12], sizeof(addr));
#endif
port = sin6->sin6_port;
memset(sin4, 0, sizeof(struct sockaddr_in));
sin4->sin_addr.s_addr = addr;
sin4->sin_port = port;
sin4->sin_family = AF_INET;
*len = sizeof(struct sockaddr_in);
#ifdef HAVE_SA_LEN
sin4->sin_len = sizeof(struct sockaddr_in);
#endif
}
/*
* Get server response
*/
static int
ftp_chkerr(conn_t *conn)
{
if (fetch_getln(conn) == -1) {
fetch_syserr();
return (-1);
}
if (isftpinfo(conn->buf)) {
while (conn->buflen && !isftpreply(conn->buf)) {
if (fetch_getln(conn) == -1) {
fetch_syserr();
return (-1);
}
}
}
while (conn->buflen &&
isspace((unsigned char)conn->buf[conn->buflen - 1]))
conn->buflen--;
conn->buf[conn->buflen] = '\0';
if (!isftpreply(conn->buf)) {
ftp_seterr(FTP_PROTOCOL_ERROR);
return (-1);
}
conn->err = (conn->buf[0] - '0') * 100
+ (conn->buf[1] - '0') * 10
+ (conn->buf[2] - '0');
return (conn->err);
}
/*
* Send a command and check reply
*/
LIBFETCH_PRINTFLIKE(2, 3)
static int
ftp_cmd(conn_t *conn, const char *fmt, ...)
{
va_list ap;
size_t len;
char *msg;
int r;
va_start(ap, fmt);
len = vasprintf(&msg, fmt, ap);
va_end(ap);
if (msg == NULL) {
errno = ENOMEM;
fetch_syserr();
return (-1);
}
r = fetch_write(conn, msg, len);
free(msg);
if (r == -1) {
fetch_syserr();
return (-1);
}
return (ftp_chkerr(conn));
}
/*
* Return a pointer to the filename part of a path
*/
static const char *
ftp_filename(const char *file, int *len, int *type, int subdir)
{
const char *s;
if ((s = strrchr(file, '/')) == NULL || subdir)
s = file;
else
s = s + 1;
*len = strlen(s);
if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) {
*type = s[*len - 1];
*len -= 7;
} else {
*type = '\0';
}
return (s);
}
/*
* Get current working directory from the reply to a CWD, PWD or CDUP
* command.
*/
static int
ftp_pwd(conn_t *conn, char **pwd)
{
char *src, *dst, *end;
int q;
if (conn->err != FTP_WORKING_DIRECTORY &&
conn->err != FTP_FILE_ACTION_OK)
return (FTP_PROTOCOL_ERROR);
end = conn->buf + conn->buflen;
src = conn->buf + 4;
if (src >= end || *src++ != '"')
return (FTP_PROTOCOL_ERROR);
*pwd = malloc(end - src + 1);
if (*pwd == NULL)
return (FTP_PROTOCOL_ERROR);
for (q = 0, dst = *pwd; src < end; ++src) {
if (!q && *src == '"')
q = 1;
else if (q && *src != '"')
break;
else if (q)
*dst++ = '"', q = 0;
else
*dst++ = *src;
}
*dst = '\0';
if (**pwd != '/') {
free(*pwd);
*pwd = NULL;
return (FTP_PROTOCOL_ERROR);
}
return (FTP_OK);
}
/*
* Change working directory to the directory that contains the specified
* file.
*/
static int
ftp_cwd(conn_t *conn, const char *path, int subdir)
{
const char *beg, *end;
char *pwd, *dst;
int e, i, len;
if (*path != '/') {
ftp_seterr(501);
return (-1);
}
++path;
/* Simple case: still in the home directory and no directory change. */
if (conn->ftp_home == NULL && strchr(path, '/') == NULL &&
(!subdir || *path == '\0'))
return 0;
if ((e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY ||
(e = ftp_pwd(conn, &pwd)) != FTP_OK) {
ftp_seterr(e);
return (-1);
}
if (conn->ftp_home == NULL && (conn->ftp_home = strdup(pwd)) == NULL) {
fetch_syserr();
free(pwd);
return (-1);
}
if (*path == '/') {
while (path[1] == '/')
++path;
dst = strdup(path);
} else if (strcmp(conn->ftp_home, "/") == 0) {
dst = strdup(path - 1);
} else {
if (asprintf(&dst, "%s/%s", conn->ftp_home, path) == -1)
dst = NULL;
}
if (dst == NULL) {
fetch_syserr();
free(pwd);
return (-1);
}
if (subdir)
end = dst + strlen(dst);
else
end = strrchr(dst, '/');
for (;;) {
len = strlen(pwd);
/* Look for a common prefix between PWD and dir to fetch. */
for (i = 0; i <= len && i <= end - dst; ++i)
if (pwd[i] != dst[i])
break;
/* Keep going up a dir until we have a matching prefix. */
if (strcmp(pwd, "/") == 0)
break;
if (pwd[i] == '\0' && (dst[i - 1] == '/' || dst[i] == '/'))
break;
free(pwd);
if ((e = ftp_cmd(conn, "CDUP\r\n")) != FTP_FILE_ACTION_OK ||
(e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY ||
(e = ftp_pwd(conn, &pwd)) != FTP_OK) {
ftp_seterr(e);
free(dst);
return (-1);
}
}
free(pwd);
/* Skip leading slashes, even "////". */
for (beg = dst + i; beg < end && *beg == '/'; ++beg, ++i)
/* nothing */ ;
/* If there is no trailing dir, we're already there. */
if (beg >= end) {
free(dst);
return (0);
}
/* Change to the directory all in one chunk (e.g., foo/bar/baz). */
e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(end - beg), beg);
if (e == FTP_FILE_ACTION_OK) {
free(dst);
return (0);
}
/* That didn't work so go back to legacy behavior (multiple CWDs). */
for (beg = dst + i; beg < end; beg = dst + i + 1) {
while (*beg == '/')
++beg, ++i;
for (++i; dst + i < end && dst[i] != '/'; ++i)
/* nothing */ ;
e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(dst + i - beg), beg);
if (e != FTP_FILE_ACTION_OK) {
free(dst);
ftp_seterr(e);
return (-1);
}
}
free(dst);
return (0);
}
/*
* Set transfer mode and data type
*/
static int
ftp_mode_type(conn_t *conn, int mode, int type)
{
int e;
switch (mode) {
case 0:
case 's':
mode = 'S';
case 'S':
break;
default:
return (FTP_PROTOCOL_ERROR);
}
if ((e = ftp_cmd(conn, "MODE %c\r\n", mode)) != FTP_OK) {
if (mode == 'S') {
/*
* Stream mode is supposed to be the default - so
* much so that some servers not only do not
* support any other mode, but do not support the
* MODE command at all.
*
* If "MODE S" fails, it is unlikely that we
* previously succeeded in setting a different
* mode. Therefore, we simply hope that the
* server is already in the correct mode, and
* silently ignore the failure.
*/
} else {
return (e);
}
}
switch (type) {
case 0:
case 'i':
type = 'I';
case 'I':
break;
case 'a':
type = 'A';
case 'A':
break;
case 'd':
type = 'D';
case 'D':
/* can't handle yet */
default:
return (FTP_PROTOCOL_ERROR);
}
if ((e = ftp_cmd(conn, "TYPE %c\r\n", type)) != FTP_OK)
return (e);
return (FTP_OK);
}
/*
* Request and parse file stats
*/
static int
ftp_stat(conn_t *conn, const char *file, struct url_stat *us)
{
char *ln;
const char *filename;
int filenamelen, type, year;
struct tm tm;
time_t t;
int e;
us->size = -1;
us->atime = us->mtime = 0;
filename = ftp_filename(file, &filenamelen, &type, 0);
if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) {
ftp_seterr(e);
return (-1);
}
e = ftp_cmd(conn, "SIZE %.*s\r\n", (int)filenamelen, filename);
if (e != FTP_FILE_STATUS) {
ftp_seterr(e);
return (-1);
}
for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++)
/* nothing */ ;
for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++)
us->size = us->size * 10 + *ln - '0';
if (*ln && !isspace((unsigned char)*ln)) {
ftp_seterr(FTP_PROTOCOL_ERROR);
us->size = -1;
return (-1);
}
if (us->size == 0)
us->size = -1;
e = ftp_cmd(conn, "MDTM %.*s\r\n", (int)filenamelen, filename);
if (e != FTP_FILE_STATUS) {
ftp_seterr(e);
return (-1);
}
for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++)
/* nothing */ ;
switch (strspn(ln, "0123456789")) {
case 14:
break;
case 15:
ln++;
ln[0] = '2';
ln[1] = '0';
break;
default:
ftp_seterr(FTP_PROTOCOL_ERROR);
return (-1);
}
if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
&year, &tm.tm_mon, &tm.tm_mday,
&tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
ftp_seterr(FTP_PROTOCOL_ERROR);
return (-1);
}
tm.tm_mon--;
tm.tm_year = year - 1900;
tm.tm_isdst = -1;
t = timegm(&tm);
if (t == (time_t)-1)
t = time(NULL);
us->mtime = t;
us->atime = t;
return (0);
}
/*
* I/O functions for FTP
*/
struct ftpio {
conn_t *cconn; /* Control connection */
conn_t *dconn; /* Data connection */
int dir; /* Direction */
int eof; /* EOF reached */
int err; /* Error code */
};
static ssize_t ftp_readfn(void *, void *, size_t);
static ssize_t ftp_writefn(void *, const void *, size_t);
static void ftp_closefn(void *);
static ssize_t
ftp_readfn(void *v, void *buf, size_t len)
{
struct ftpio *io;
int r;
io = (struct ftpio *)v;
if (io == NULL) {
errno = EBADF;
return (-1);
}
if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) {
errno = EBADF;
return (-1);
}
if (io->err) {
errno = io->err;
return (-1);
}
if (io->eof)
return (0);
r = fetch_read(io->dconn, buf, len);
if (r > 0)
return (r);
if (r == 0) {
io->eof = 1;
return (0);
}
if (errno != EINTR)
io->err = errno;
return (-1);
}
static ssize_t
ftp_writefn(void *v, const void *buf, size_t len)
{
struct ftpio *io;
int w;
io = (struct ftpio *)v;
if (io == NULL) {
errno = EBADF;
return (-1);
}
if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) {
errno = EBADF;
return (-1);
}
if (io->err) {
errno = io->err;
return (-1);
}
w = fetch_write(io->dconn, buf, len);
if (w >= 0)
return (w);
if (errno != EINTR)
io->err = errno;
return (-1);
}
static int
ftp_disconnect(conn_t *conn)
{
ftp_cmd(conn, "QUIT\r\n");
return fetch_close(conn);
}
static void
ftp_closefn(void *v)
{
struct ftpio *io;
io = (struct ftpio *)v;
if (io == NULL) {
errno = EBADF;
return;
}
if (io->dir == -1)
return;
if (io->cconn == NULL || io->dconn == NULL) {
errno = EBADF;
return;
}
fetch_close(io->dconn);
io->dconn = NULL;
io->dir = -1;
ftp_chkerr(io->cconn);
fetch_cache_put(io->cconn, ftp_disconnect);
free(io);
return;
}
static fetchIO *
ftp_setup(conn_t *cconn, conn_t *dconn, int mode)
{
struct ftpio *io;
fetchIO *f;
if (cconn == NULL || dconn == NULL)
return (NULL);
if ((io = malloc(sizeof(*io))) == NULL)
return (NULL);
io->cconn = cconn;
io->dconn = dconn;
io->dir = mode;
io->eof = io->err = 0;
f = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn);
if (f == NULL)
free(io);
return (f);
}
/*
* Transfer file
*/
static fetchIO *
ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg,
int mode, off_t offset, const char *flags)
{
union anonymous {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_in6 sin6;
struct sockaddr_in sin4;
} u;
const char *bindaddr;
const char *filename;
int filenamelen, type;
int pasv, verbose;
int e, sd = -1;
socklen_t l;
char *s;
fetchIO *df;
/* check flags */
pasv = !CHECK_FLAG('a');
verbose = CHECK_FLAG('v');
/* passive mode */
if (!pasv)
pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL &&
strncasecmp(s, "no", 2) != 0);
/* isolate filename */
filename = ftp_filename(file, &filenamelen, &type, op_arg != NULL);
/* set transfer mode and data type */
if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK)
goto ouch;
/* find our own address, bind, and listen */
l = sizeof(u.ss);
if (getsockname(conn->sd, &u.sa, &l) == -1)
goto sysouch;
if (u.ss.ss_family == AF_INET6)
unmappedaddr(&u.sin6, &l);
retry_mode:
/* open data socket */
if ((sd = socket(u.ss.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
fetch_syserr();
return (NULL);
}
if (pasv) {
unsigned char addr[64];
char *ln, *p;
unsigned int i;
int port;
/* send PASV command */
if (verbose)
fetch_info("setting passive mode");
switch (u.ss.ss_family) {
case AF_INET:
if ((e = ftp_cmd(conn, "PASV\r\n")) != FTP_PASSIVE_MODE)
goto ouch;
break;
case AF_INET6:
if ((e = ftp_cmd(conn, "EPSV\r\n")) != FTP_EPASSIVE_MODE) {
if (e == -1)
goto ouch;
if ((e = ftp_cmd(conn, "LPSV\r\n")) !=
FTP_LPASSIVE_MODE)
goto ouch;
}
break;
default:
e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
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 = conn->buf;
switch (e) {
case FTP_PASSIVE_MODE:
case FTP_LPASSIVE_MODE:
for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++)
/* nothing */ ;
if (!*p) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
l = (e == FTP_PASSIVE_MODE ? 6 : 21);
for (i = 0; *p && i < l; i++, p++)
addr[i] = strtol(p, &p, 10);
if (i < l) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
break;
case FTP_EPASSIVE_MODE:
for (p = ln + 3; *p && *p != '('; p++)
/* nothing */ ;
if (!*p) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
++p;
if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
&port, &addr[3]) != 5 ||
addr[0] != addr[1] ||
addr[0] != addr[2] || addr[0] != addr[3]) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
break;
case FTP_SYNTAX_ERROR:
if (verbose)
fetch_info("passive mode failed");
/* Close socket and retry with passive mode. */
pasv = 0;
close(sd);
sd = -1;
goto retry_mode;
}
/* seek to required offset */
if (offset)
if (ftp_cmd(conn, "REST %lu\r\n", (unsigned long)offset) != FTP_FILE_OK)
goto sysouch;
/* construct sockaddr for data socket */
l = sizeof(u.ss);
if (getpeername(conn->sd, &u.sa, &l) == -1)
goto sysouch;
if (u.ss.ss_family == AF_INET6)
unmappedaddr(&u.sin6, &l);
switch (u.ss.ss_family) {
case AF_INET6:
if (e == FTP_EPASSIVE_MODE)
u.sin6.sin6_port = htons(port);
else {
memcpy(&u.sin6.sin6_addr, addr + 2, 16);
memcpy(&u.sin6.sin6_port, addr + 19, 2);
}
break;
case AF_INET:
if (e == FTP_EPASSIVE_MODE)
u.sin4.sin_port = htons(port);
else {
memcpy(&u.sin4.sin_addr, addr, 4);
memcpy(&u.sin4.sin_port, addr + 4, 2);
}
break;
default:
e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
break;
}
/* connect to data port */
if (verbose)
fetch_info("opening data connection");
bindaddr = getenv("FETCH_BIND_ADDRESS");
if (bindaddr != NULL && *bindaddr != '\0' &&
fetch_bind(sd, u.ss.ss_family, bindaddr) != 0)
goto sysouch;
if (connect(sd, &u.sa, l) == -1)
goto sysouch;
/* make the server initiate the transfer */
if (verbose)
fetch_info("initiating transfer");
if (op_arg)
e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg);
else
e = ftp_cmd(conn, "%s %.*s\r\n", oper,
(int)filenamelen, filename);
if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
goto ouch;
} else {
uint32_t a;
uint16_t p;
#if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE)
int arg;
int low = CHECK_FLAG('l');
#endif
int d;
char hname[INET6_ADDRSTRLEN];
switch (u.ss.ss_family) {
case AF_INET6:
u.sin6.sin6_port = 0;
#ifdef IPV6_PORTRANGE
arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH;
if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
(char *)&arg, sizeof(arg)) == -1)
goto sysouch;
#endif
break;
case AF_INET:
u.sin4.sin_port = 0;
#ifdef IP_PORTRANGE
arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH;
if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
(char *)&arg, sizeof(arg)) == -1)
goto sysouch;
#endif
break;
}
if (verbose)
fetch_info("binding data socket");
if (bind(sd, &u.sa, l) == -1)
goto sysouch;
if (listen(sd, 1) == -1)
goto sysouch;
/* find what port we're on and tell the server */
if (getsockname(sd, &u.sa, &l) == -1)
goto sysouch;
switch (u.ss.ss_family) {
case AF_INET:
a = ntohl(u.sin4.sin_addr.s_addr);
p = ntohs(u.sin4.sin_port);
e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d\r\n",
(a >> 24) & 0xff, (a >> 16) & 0xff,
(a >> 8) & 0xff, a & 0xff,
(p >> 8) & 0xff, p & 0xff);
break;
case AF_INET6:
e = -1;
u.sin6.sin6_scope_id = 0;
if (getnameinfo(&u.sa, l,
hname, sizeof(hname),
NULL, 0, NI_NUMERICHOST) == 0) {
e = ftp_cmd(conn, "EPRT |%d|%s|%d|\r\n", 2, hname,
htons(u.sin6.sin6_port));
if (e == -1)
goto ouch;
}
if (e != FTP_OK) {
unsigned char *ap = (void *)&u.sin6.sin6_addr.s6_addr;
uint16_t port = ntohs(u.sin6.sin6_port);
e = ftp_cmd(conn,
"LPRT %d,%d,%u,%u,%u,%u,%u,%u,%u,%u,"
"%u,%u,%u,%u,%u,%u,%u,%u,%d,%d,%d\r\n",
6, 16,
(unsigned)ap[0], (unsigned)ap[1],
(unsigned)ap[2], (unsigned)ap[3],
(unsigned)ap[4], (unsigned)ap[5],
(unsigned)ap[6], (unsigned)ap[7],
(unsigned)ap[8], (unsigned)ap[9],
(unsigned)ap[10], (unsigned)ap[11],
(unsigned)ap[12], (unsigned)ap[13],
(unsigned)ap[14], (unsigned)ap[15],
2, port >> 8, port & 0xff);
}
break;
default:
e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
goto ouch;
}
if (e != FTP_OK)
goto ouch;
/* seek to required offset */
if (offset)
if (ftp_cmd(conn, "REST %llu\r\n", (unsigned long long)offset) != FTP_FILE_OK)
goto sysouch;
/* make the server initiate the transfer */
if (verbose)
fetch_info("initiating transfer");
if (op_arg)
e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg);
else
e = ftp_cmd(conn, "%s %.*s\r\n", oper,
(int)filenamelen, filename);
if (e != FTP_CONNECTION_ALREADY_OPEN && 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 = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL)
goto sysouch;
return (df);
sysouch:
fetch_syserr();
if (sd >= 0)
close(sd);
return (NULL);
ouch:
if (e != -1)
ftp_seterr(e);
if (sd >= 0)
close(sd);
return (NULL);
}
/*
* Authenticate
*/
static int
ftp_authenticate(conn_t *conn, struct url *url, struct url *purl)
{
const char *user, *pwd;
int e;
/* XXX FTP_AUTH, and maybe .netrc */
/* send user name and password */
if (url->user[0] == '\0')
fetch_netrc_auth(url);
user = url->user;
if (*user == '\0')
user = getenv("FTP_LOGIN");
if (user == NULL || *user == '\0')
user = FTP_ANONYMOUS_USER;
if (purl && url->port == fetch_default_port(url->scheme))
e = ftp_cmd(conn, "USER %s@%s\r\n", user, url->host);
else if (purl)
e = ftp_cmd(conn, "USER %s@%s@%d\r\n", user, url->host, url->port);
else
e = ftp_cmd(conn, "USER %s\r\n", user);
/* did the server request a password? */
if (e == FTP_NEED_PASSWORD) {
pwd = url->pwd;
if (*pwd == '\0')
pwd = getenv("FTP_PASSWORD");
if (pwd == NULL || *pwd == '\0')
pwd = FTP_ANONYMOUS_PASSWORD;
e = ftp_cmd(conn, "PASS %s\r\n", pwd);
}
return (e);
}
/*
* Log on to FTP server
*/
static conn_t *
ftp_connect(struct url *url, struct url *purl, const char *flags)
{
conn_t *conn;
int e, direct, verbose;
int af = AF_UNSPEC;
direct = CHECK_FLAG('d');
verbose = CHECK_FLAG('v');
if (CHECK_FLAG('4'))
af = AF_INET;
else if (CHECK_FLAG('6'))
af = AF_INET6;
if (direct)
purl = NULL;
/* check for proxy */
if (purl) {
/* XXX proxy authentication! */
/* XXX connetion caching */
if (!purl->port)
purl->port = fetch_default_port(purl->scheme);
conn = fetch_connect(purl, af, verbose);
} else {
/* no proxy, go straight to target */
if (!url->port)
url->port = fetch_default_port(url->scheme);
while ((conn = fetch_cache_get(url, af)) != NULL) {
e = ftp_cmd(conn, "NOOP\r\n");
if (e == FTP_OK)
return conn;
fetch_close(conn);
}
conn = fetch_connect(url, af, verbose);
purl = NULL;
}
/* check connection */
if (conn == NULL)
/* fetch_connect() has already set an error code */
return (NULL);
/* expect welcome message */
if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY)
goto fouch;
/* authenticate */
if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN)
goto fouch;
/* TODO: Request extended features supported, if any (RFC 3659). */
/* done */
return (conn);
fouch:
if (e != -1)
ftp_seterr(e);
fetch_close(conn);
return (NULL);
}
/*
* Check the proxy settings
*/
static struct url *
ftp_get_proxy(struct url * url, const char *flags)
{
struct url *purl;
char *p;
if (flags != NULL && strchr(flags, 'd') != NULL)
return (NULL);
if (fetch_no_proxy_match(url->host))
return (NULL);
if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) ||
(p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
*p && (purl = fetchParseURL(p)) != NULL) {
if (!*purl->scheme) {
if (getenv("FTP_PROXY") || getenv("ftp_proxy"))
strcpy(purl->scheme, SCHEME_FTP);
else
strcpy(purl->scheme, SCHEME_HTTP);
}
if (!purl->port)
purl->port = fetch_default_proxy_port(purl->scheme);
if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 ||
strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
return (purl);
fetchFreeURL(purl);
}
return (NULL);
}
/*
* Process an FTP request
*/
fetchIO *
ftp_request(struct url *url, const char *op, const char *op_arg,
struct url_stat *us, struct url *purl, const char *flags)
{
fetchIO *f;
char *path;
conn_t *conn;
int if_modified_since, oflag;
struct url_stat local_us;
/* check if we should use HTTP instead */
if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) {
if (strcmp(op, "STAT") == 0)
return (http_request(url, "HEAD", us, purl, flags));
else if (strcmp(op, "RETR") == 0)
return (http_request(url, "GET", us, purl, flags));
/*
* Our HTTP code doesn't support PUT requests yet, so try
* a direct connection.
*/
}
/* connect to server */
conn = ftp_connect(url, purl, flags);
if (purl)
fetchFreeURL(purl);
if (conn == NULL)
return (NULL);
if ((path = fetchUnquotePath(url)) == NULL) {
fetch_close(conn);
fetch_syserr();
return NULL;
}
/* change directory */
if (ftp_cwd(conn, path, op_arg != NULL) == -1) {
fetch_close(conn);
free(path);
return (NULL);
}
if_modified_since = CHECK_FLAG('i');
if (if_modified_since && us == NULL)
us = &local_us;
/* stat file */
if (us && ftp_stat(conn, path, us) == -1
&& fetchLastErrCode != FETCH_PROTO
&& fetchLastErrCode != FETCH_UNAVAIL) {
fetch_close(conn);
free(path);
return (NULL);
}
if (if_modified_since && url->last_modified > 0 &&
url->last_modified >= us->mtime) {
fetch_cache_put(conn, ftp_disconnect);
free(path);
fetchLastErrCode = FETCH_UNCHANGED;
snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged");
return NULL;
}
/* just a stat */
if (strcmp(op, "STAT") == 0) {
fetch_cache_put(conn, ftp_disconnect);
free(path);
return fetchIO_unopen(NULL, NULL, NULL, NULL);
}
if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0)
oflag = O_WRONLY;
else
oflag = O_RDONLY;
/* initiate the transfer */
f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags));
free(path);
return f;
}
/*
* Get and stat file
*/
fetchIO *
fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags)
{
return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags));
}
/*
* Get file
*/
fetchIO *
fetchGetFTP(struct url *url, const char *flags)
{
return (fetchXGetFTP(url, NULL, flags));
}
/*
* Put file
*/
fetchIO *
fetchPutFTP(struct url *url, const char *flags)
{
return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL,
ftp_get_proxy(url, flags), flags));
}
/*
* Get file stats
*/
int
fetchStatFTP(struct url *url, struct url_stat *us, const char *flags)
{
fetchIO *f;
f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags);
if (f == NULL)
return (-1);
fetchIO_close(f);
return (0);
}
/*
* List a directory
*/
int
fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags)
{
fetchIO *f;
char buf[2 * PATH_MAX], *eol, *eos;
ssize_t len;
size_t cur_off;
int ret;
/* XXX What about proxies? */
if (pattern == NULL || strcmp(pattern, "*") == 0)
pattern = "";
f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags);
if (f == NULL)
return -1;
cur_off = 0;
ret = 0;
while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) {
cur_off += len;
while ((eol = memchr(buf, '\n', cur_off)) != NULL) {
if (len == eol - buf)
break;
if (eol != buf) {
if (eol[-1] == '\r')
eos = eol - 1;
else
eos = eol;
*eos = '\0';
ret = fetch_add_entry(ue, url, buf, 0);
if (ret)
break;
cur_off -= eol - buf + 1;
memmove(buf, eol + 1, cur_off);
}
}
if (ret)
break;
}
if (cur_off != 0 || len < 0) {
/* Not RFC conform, bail out. */
fetchIO_close(f);
return -1;
}
fetchIO_close(f);
return ret;
}
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