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nest-open-source / nest-learning-thermostat / 5.0.2 / curl / refs/heads/master / . / curl-7.25.0 / lib / ftp.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "setup.h"
#ifndef CURL_DISABLE_FTP
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_UTSNAME_H
#include <sys/utsname.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"
#include "if2ip.h"
#include "hostip.h"
#include "progress.h"
#include "transfer.h"
#include "escape.h"
#include "http.h" /* for HTTP proxy tunnel stuff */
#include "socks.h"
#include "ftp.h"
#include "fileinfo.h"
#include "ftplistparser.h"
#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
#include "krb4.h"
#endif
#include "strtoofft.h"
#include "strequal.h"
#include "sslgen.h"
#include "connect.h"
#include "strerror.h"
#include "inet_ntop.h"
#include "inet_pton.h"
#include "select.h"
#include "parsedate.h" /* for the week day and month names */
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "multiif.h"
#include "url.h"
#include "rawstr.h"
#include "speedcheck.h"
#include "warnless.h"
#include "http_proxy.h"
#include "non-ascii.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
#ifndef NI_MAXHOST
#define NI_MAXHOST 1025
#endif
#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif
#ifdef CURL_DISABLE_VERBOSE_STRINGS
#define ftp_pasv_verbose(a,b,c,d) Curl_nop_stmt
#endif
/* Local API functions */
static void state(struct connectdata *conn,
ftpstate newstate);
static CURLcode ftp_sendquote(struct connectdata *conn,
struct curl_slist *quote);
static CURLcode ftp_quit(struct connectdata *conn);
static CURLcode ftp_parse_url_path(struct connectdata *conn);
static CURLcode ftp_regular_transfer(struct connectdata *conn, bool *done);
#ifndef CURL_DISABLE_VERBOSE_STRINGS
static void ftp_pasv_verbose(struct connectdata *conn,
Curl_addrinfo *ai,
char *newhost, /* ascii version */
int port);
#endif
static CURLcode ftp_state_post_rest(struct connectdata *conn);
static CURLcode ftp_state_post_cwd(struct connectdata *conn);
static CURLcode ftp_state_quote(struct connectdata *conn,
bool init, ftpstate instate);
static CURLcode ftp_nb_type(struct connectdata *conn,
bool ascii, ftpstate newstate);
static int ftp_need_type(struct connectdata *conn,
bool ascii);
static CURLcode ftp_do(struct connectdata *conn, bool *done);
static CURLcode ftp_done(struct connectdata *conn,
CURLcode, bool premature);
static CURLcode ftp_connect(struct connectdata *conn, bool *done);
static CURLcode ftp_disconnect(struct connectdata *conn, bool dead_connection);
static CURLcode ftp_do_more(struct connectdata *conn, bool *completed);
static CURLcode ftp_multi_statemach(struct connectdata *conn, bool *done);
static int ftp_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks);
static int ftp_domore_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks);
static CURLcode ftp_doing(struct connectdata *conn,
bool *dophase_done);
static CURLcode ftp_setup_connection(struct connectdata * conn);
static CURLcode init_wc_data(struct connectdata *conn);
static CURLcode wc_statemach(struct connectdata *conn);
static void wc_data_dtor(void *ptr);
static CURLcode ftp_state_post_retr_size(struct connectdata *conn,
curl_off_t filesize);
static CURLcode ftp_readresp(curl_socket_t sockfd,
struct pingpong *pp,
int *ftpcode,
size_t *size);
/* easy-to-use macro: */
#define FTPSENDF(x,y,z) if((result = Curl_ftpsendf(x,y,z)) != CURLE_OK) \
return result
#define PPSENDF(x,y,z) if((result = Curl_pp_sendf(x,y,z)) != CURLE_OK) \
return result
/*
* FTP protocol handler.
*/
const struct Curl_handler Curl_handler_ftp = {
"FTP", /* scheme */
ftp_setup_connection, /* setup_connection */
ftp_do, /* do_it */
ftp_done, /* done */
ftp_do_more, /* do_more */
ftp_connect, /* connect_it */
ftp_multi_statemach, /* connecting */
ftp_doing, /* doing */
ftp_getsock, /* proto_getsock */
ftp_getsock, /* doing_getsock */
ftp_domore_getsock, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_FTP, /* defport */
CURLPROTO_FTP, /* protocol */
PROTOPT_DUAL | PROTOPT_CLOSEACTION | PROTOPT_NEEDSPWD
| PROTOPT_NOURLQUERY /* flags */
};
#ifdef USE_SSL
/*
* FTPS protocol handler.
*/
const struct Curl_handler Curl_handler_ftps = {
"FTPS", /* scheme */
ftp_setup_connection, /* setup_connection */
ftp_do, /* do_it */
ftp_done, /* done */
ftp_do_more, /* do_more */
ftp_connect, /* connect_it */
ftp_multi_statemach, /* connecting */
ftp_doing, /* doing */
ftp_getsock, /* proto_getsock */
ftp_getsock, /* doing_getsock */
ftp_domore_getsock, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_FTPS, /* defport */
CURLPROTO_FTP | CURLPROTO_FTPS, /* protocol */
PROTOPT_SSL | PROTOPT_DUAL | PROTOPT_CLOSEACTION |
PROTOPT_NEEDSPWD | PROTOPT_NOURLQUERY /* flags */
};
#endif
#ifndef CURL_DISABLE_HTTP
/*
* HTTP-proxyed FTP protocol handler.
*/
static const struct Curl_handler Curl_handler_ftp_proxy = {
"FTP", /* scheme */
ZERO_NULL, /* setup_connection */
Curl_http, /* do_it */
Curl_http_done, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_FTP, /* defport */
CURLPROTO_HTTP, /* protocol */
PROTOPT_NONE /* flags */
};
#ifdef USE_SSL
/*
* HTTP-proxyed FTPS protocol handler.
*/
static const struct Curl_handler Curl_handler_ftps_proxy = {
"FTPS", /* scheme */
ZERO_NULL, /* setup_connection */
Curl_http, /* do_it */
Curl_http_done, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_FTPS, /* defport */
CURLPROTO_HTTP, /* protocol */
PROTOPT_NONE /* flags */
};
#endif
#endif
/*
* NOTE: back in the old days, we added code in the FTP code that made NOBODY
* requests on files respond with headers passed to the client/stdout that
* looked like HTTP ones.
*
* This approach is not very elegant, it causes confusion and is error-prone.
* It is subject for removal at the next (or at least a future) soname bump.
* Until then you can test the effects of the removal by undefining the
* following define named CURL_FTP_HTTPSTYLE_HEAD.
*/
#define CURL_FTP_HTTPSTYLE_HEAD 1
static void freedirs(struct ftp_conn *ftpc)
{
int i;
if(ftpc->dirs) {
for(i=0; i < ftpc->dirdepth; i++) {
if(ftpc->dirs[i]) {
free(ftpc->dirs[i]);
ftpc->dirs[i]=NULL;
}
}
free(ftpc->dirs);
ftpc->dirs = NULL;
ftpc->dirdepth = 0;
}
if(ftpc->file) {
free(ftpc->file);
ftpc->file = NULL;
}
}
/* Returns non-zero if the given string contains CR (\r) or LF (\n),
which are not allowed within RFC 959 <string>.
Note: The input string is in the client's encoding which might
not be ASCII, so escape sequences \r & \n must be used instead
of hex values 0x0d & 0x0a.
*/
static bool isBadFtpString(const char *string)
{
return ((NULL != strchr(string, '\r')) ||
(NULL != strchr(string, '\n'))) ? TRUE : FALSE;
}
/***********************************************************************
*
* AcceptServerConnect()
*
* After connection request is received from the server this function is
* called to accept the connection and close the listening socket
*
*/
static CURLcode AcceptServerConnect(struct connectdata *conn)
{
struct SessionHandle *data = conn->data;
curl_socket_t sock = conn->sock[SECONDARYSOCKET];
curl_socket_t s = CURL_SOCKET_BAD;
#ifdef ENABLE_IPV6
struct Curl_sockaddr_storage add;
#else
struct sockaddr_in add;
#endif
curl_socklen_t size = (curl_socklen_t) sizeof(add);
if(0 == getsockname(sock, (struct sockaddr *) &add, &size)) {
size = sizeof(add);
s=accept(sock, (struct sockaddr *) &add, &size);
}
Curl_closesocket(conn, sock); /* close the first socket */
if(CURL_SOCKET_BAD == s) {
failf(data, "Error accept()ing server connect");
return CURLE_FTP_PORT_FAILED;
}
infof(data, "Connection accepted from server\n");
conn->sock[SECONDARYSOCKET] = s;
curlx_nonblock(s, TRUE); /* enable non-blocking */
conn->sock_accepted[SECONDARYSOCKET] = TRUE;
return CURLE_OK;
}
/*
* ftp_timeleft_accept() returns the amount of milliseconds left allowed for
* waiting server to connect. If the value is negative, the timeout time has
* already elapsed.
*
* The start time is stored in progress.t_acceptdata - as set with
* Curl_pgrsTime(..., TIMER_STARTACCEPT);
*
*/
static long ftp_timeleft_accept(struct SessionHandle *data)
{
long timeout_ms = DEFAULT_ACCEPT_TIMEOUT;
long other;
struct timeval now;
if(data->set.accepttimeout > 0)
timeout_ms = data->set.accepttimeout;
now = Curl_tvnow();
/* check if the generic timeout possibly is set shorter */
other = Curl_timeleft(data, &now, FALSE);
if(other && (other < timeout_ms))
/* note that this also works fine for when other happens to be negative
due to it already having elapsed */
timeout_ms = other;
else {
/* subtract elapsed time */
timeout_ms -= Curl_tvdiff(now, data->progress.t_acceptdata);
if(!timeout_ms)
/* avoid returning 0 as that means no timeout! */
return -1;
}
return timeout_ms;
}
/***********************************************************************
*
* ReceivedServerConnect()
*
* After allowing server to connect to us from data port, this function
* checks both data connection for connection establishment and ctrl
* connection for a negative response regarding a failure in connecting
*
*/
static CURLcode ReceivedServerConnect(struct connectdata* conn, bool* received)
{
struct SessionHandle *data = conn->data;
curl_socket_t ctrl_sock = conn->sock[FIRSTSOCKET];
curl_socket_t data_sock = conn->sock[SECONDARYSOCKET];
struct ftp_conn *ftpc = &conn->proto.ftpc;
struct pingpong *pp = &ftpc->pp;
int result;
long timeout_ms;
ssize_t nread;
int ftpcode;
*received = FALSE;
timeout_ms = ftp_timeleft_accept(data);
infof(data, "Checking for server connect\n");
if(timeout_ms < 0) {
/* if a timeout was already reached, bail out */
failf(data, "Accept timeout occurred while waiting server connect");
return CURLE_FTP_ACCEPT_TIMEOUT;
}
/* First check whether there is a cached response from server */
if(pp->cache_size && pp->cache && pp->cache[0] > '3') {
/* Data connection could not be established, let's return */
infof(data, "There is negative response in cache while serv connect\n");
Curl_GetFTPResponse(&nread, conn, &ftpcode);
return CURLE_FTP_ACCEPT_FAILED;
}
result = Curl_socket_check(ctrl_sock, data_sock, CURL_SOCKET_BAD, 0);
/* see if the connection request is already here */
switch (result) {
case -1: /* error */
/* let's die here */
failf(data, "Error while waiting for server connect");
return CURLE_FTP_ACCEPT_FAILED;
case 0: /* Server connect is not received yet */
break; /* loop */
default:
if(result & CURL_CSELECT_IN2) {
infof(data, "Ready to accept data connection from server\n");
*received = TRUE;
}
else if(result & CURL_CSELECT_IN) {
infof(data, "Ctrl conn has data while waiting for data conn\n");
Curl_GetFTPResponse(&nread, conn, &ftpcode);
if(ftpcode/100 > 3)
return CURLE_FTP_ACCEPT_FAILED;
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
break;
} /* switch() */
return CURLE_OK;
}
/***********************************************************************
*
* InitiateTransfer()
*
* After connection from server is accepted this function is called to
* setup transfer parameters and initiate the data transfer.
*
*/
static CURLcode InitiateTransfer(struct connectdata *conn)
{
struct SessionHandle *data = conn->data;
struct FTP *ftp = data->state.proto.ftp;
CURLcode result = CURLE_OK;
if(conn->ssl[SECONDARYSOCKET].use) {
/* since we only have a plaintext TCP connection here, we must now
* do the TLS stuff */
infof(data, "Doing the SSL/TLS handshake on the data stream\n");
result = Curl_ssl_connect(conn, SECONDARYSOCKET);
if(result)
return result;
}
if(conn->proto.ftpc.state_saved == FTP_STOR) {
*(ftp->bytecountp)=0;
/* When we know we're uploading a specified file, we can get the file
size prior to the actual upload. */
Curl_pgrsSetUploadSize(data, data->set.infilesize);
/* set the SO_SNDBUF for the secondary socket for those who need it */
Curl_sndbufset(conn->sock[SECONDARYSOCKET]);
Curl_setup_transfer(conn, -1, -1, FALSE, NULL, /* no download */
SECONDARYSOCKET, ftp->bytecountp);
}
else {
/* FTP download: */
Curl_setup_transfer(conn, SECONDARYSOCKET,
conn->proto.ftpc.retr_size_saved, FALSE,
ftp->bytecountp, -1, NULL); /* no upload here */
}
conn->proto.ftpc.pp.pending_resp = TRUE; /* expect server response */
state(conn, FTP_STOP);
return CURLE_OK;
}
/***********************************************************************
*
* AllowServerConnect()
*
* When we've issue the PORT command, we have told the server to connect
* to us. This function
* - will sit and wait here until the server has connected for easy interface
* - will check whether data connection is established if so it is accepted
* for multi interface
*
*/
static CURLcode AllowServerConnect(struct connectdata *conn, bool *connected)
{
struct SessionHandle *data = conn->data;
long timeout_ms;
long interval_ms;
CURLcode ret = CURLE_OK;
*connected = FALSE;
infof(data, "Preparing for accepting server on data port\n");
/* Save the time we start accepting server connect */
Curl_pgrsTime(data, TIMER_STARTACCEPT);
for(;;) {
timeout_ms = ftp_timeleft_accept(data);
if(timeout_ms < 0) {
/* if a timeout was already reached, bail out */
failf(data, "Accept timeout occurred while waiting server connect");
return CURLE_FTP_ACCEPT_TIMEOUT;
}
/* see if the connection request is already here */
ret = ReceivedServerConnect(conn, connected);
if(ret)
return ret;
if(*connected) {
ret = AcceptServerConnect(conn);
if(ret)
return ret;
ret = InitiateTransfer(conn);
if(ret)
return ret;
break; /* connection is accepted, break the loop */
}
else {
if(data->state.used_interface == Curl_if_easy) {
interval_ms = 1000;
if(timeout_ms < interval_ms)
interval_ms = timeout_ms;
/* sleep for 1 second and then continue */
Curl_socket_ready(CURL_SOCKET_BAD, CURL_SOCKET_BAD, interval_ms);
}
else {
/* Add timeout to multi handle and break out of the loop */
if(ret == CURLE_OK && *connected == FALSE) {
if(data->set.accepttimeout > 0)
Curl_expire(data, data->set.accepttimeout);
else
Curl_expire(data, DEFAULT_ACCEPT_TIMEOUT);
}
break; /* connection was not accepted immediately */
}
}
}
return ret;
}
/* macro to check for a three-digit ftp status code at the start of the
given string */
#define STATUSCODE(line) (ISDIGIT(line[0]) && ISDIGIT(line[1]) && \
ISDIGIT(line[2]))
/* macro to check for the last line in an FTP server response */
#define LASTLINE(line) (STATUSCODE(line) && (' ' == line[3]))
static int ftp_endofresp(struct pingpong *pp,
int *code)
{
char *line = pp->linestart_resp;
size_t len = pp->nread_resp;
if((len > 3) && LASTLINE(line)) {
*code = curlx_sltosi(strtol(line, NULL, 10));
return 1;
}
return 0;
}
static CURLcode ftp_readresp(curl_socket_t sockfd,
struct pingpong *pp,
int *ftpcode, /* return the ftp-code if done */
size_t *size) /* size of the response */
{
struct connectdata *conn = pp->conn;
#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
struct SessionHandle *data = conn->data;
char * const buf = data->state.buffer;
#endif
CURLcode result = CURLE_OK;
int code;
result = Curl_pp_readresp(sockfd, pp, &code, size);
#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
/* handle the security-oriented responses 6xx ***/
/* FIXME: some errorchecking perhaps... ***/
switch(code) {
case 631:
code = Curl_sec_read_msg(conn, buf, PROT_SAFE);
break;
case 632:
code = Curl_sec_read_msg(conn, buf, PROT_PRIVATE);
break;
case 633:
code = Curl_sec_read_msg(conn, buf, PROT_CONFIDENTIAL);
break;
default:
/* normal ftp stuff we pass through! */
break;
}
#endif
/* store the latest code for later retrieval */
conn->data->info.httpcode=code;
if(ftpcode)
*ftpcode = code;
if(421 == code)
/* 421 means "Service not available, closing control connection." and FTP
* servers use it to signal that idle session timeout has been exceeded.
* If we ignored the response, it could end up hanging in some cases. */
return CURLE_OPERATION_TIMEDOUT;
return result;
}
/* --- parse FTP server responses --- */
/*
* Curl_GetFTPResponse() is a BLOCKING function to read the full response
* from a server after a command.
*
*/
CURLcode Curl_GetFTPResponse(ssize_t *nreadp, /* return number of bytes read */
struct connectdata *conn,
int *ftpcode) /* return the ftp-code */
{
/*
* We cannot read just one byte per read() and then go back to select() as
* the OpenSSL read() doesn't grok that properly.
*
* Alas, read as much as possible, split up into lines, use the ending
* line in a response or continue reading. */
curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
long timeout; /* timeout in milliseconds */
long interval_ms;
struct SessionHandle *data = conn->data;
CURLcode result = CURLE_OK;
struct ftp_conn *ftpc = &conn->proto.ftpc;
struct pingpong *pp = &ftpc->pp;
size_t nread;
int cache_skip=0;
int value_to_be_ignored=0;
if(ftpcode)
*ftpcode = 0; /* 0 for errors */
else
/* make the pointer point to something for the rest of this function */
ftpcode = &value_to_be_ignored;
*nreadp=0;
while(!*ftpcode && !result) {
/* check and reset timeout value every lap */
timeout = Curl_pp_state_timeout(pp);
if(timeout <=0 ) {
failf(data, "FTP response timeout");
return CURLE_OPERATION_TIMEDOUT; /* already too little time */
}
interval_ms = 1000; /* use 1 second timeout intervals */
if(timeout < interval_ms)
interval_ms = timeout;
/*
* Since this function is blocking, we need to wait here for input on the
* connection and only then we call the response reading function. We do
* timeout at least every second to make the timeout check run.
*
* A caution here is that the ftp_readresp() function has a cache that may
* contain pieces of a response from the previous invoke and we need to
* make sure we don't just wait for input while there is unhandled data in
* that cache. But also, if the cache is there, we call ftp_readresp() and
* the cache wasn't good enough to continue we must not just busy-loop
* around this function.
*
*/
if(pp->cache && (cache_skip < 2)) {
/*
* There's a cache left since before. We then skipping the wait for
* socket action, unless this is the same cache like the previous round
* as then the cache was deemed not enough to act on and we then need to
* wait for more data anyway.
*/
}
else {
switch (Curl_socket_ready(sockfd, CURL_SOCKET_BAD, interval_ms)) {
case -1: /* select() error, stop reading */
failf(data, "FTP response aborted due to select/poll error: %d",
SOCKERRNO);
return CURLE_RECV_ERROR;
case 0: /* timeout */
if(Curl_pgrsUpdate(conn))
return CURLE_ABORTED_BY_CALLBACK;
continue; /* just continue in our loop for the timeout duration */
default: /* for clarity */
break;
}
}
result = ftp_readresp(sockfd, pp, ftpcode, &nread);
if(result)
break;
if(!nread && pp->cache)
/* bump cache skip counter as on repeated skips we must wait for more
data */
cache_skip++;
else
/* when we got data or there is no cache left, we reset the cache skip
counter */
cache_skip=0;
*nreadp += nread;
} /* while there's buffer left and loop is requested */
pp->pending_resp = FALSE;
return result;
}
/* This is the ONLY way to change FTP state! */
static void state(struct connectdata *conn,
ftpstate newstate)
{
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* for debug purposes */
static const char * const names[]={
"STOP",
"WAIT220",
"AUTH",
"USER",
"PASS",
"ACCT",
"PBSZ",
"PROT",
"CCC",
"PWD",
"SYST",
"NAMEFMT",
"QUOTE",
"RETR_PREQUOTE",
"STOR_PREQUOTE",
"POSTQUOTE",
"CWD",
"MKD",
"MDTM",
"TYPE",
"LIST_TYPE",
"RETR_TYPE",
"STOR_TYPE",
"SIZE",
"RETR_SIZE",
"STOR_SIZE",
"REST",
"RETR_REST",
"PORT",
"PRET",
"PASV",
"LIST",
"RETR",
"STOR",
"QUIT"
};
#endif
struct ftp_conn *ftpc = &conn->proto.ftpc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
if(ftpc->state != newstate)
infof(conn->data, "FTP %p state change from %s to %s\n",
ftpc, names[ftpc->state], names[newstate]);
#endif
ftpc->state = newstate;
}
static CURLcode ftp_state_user(struct connectdata *conn)
{
CURLcode result;
struct FTP *ftp = conn->data->state.proto.ftp;
/* send USER */
PPSENDF(&conn->proto.ftpc.pp, "USER %s", ftp->user?ftp->user:"");
state(conn, FTP_USER);
conn->data->state.ftp_trying_alternative = FALSE;
return CURLE_OK;
}
static CURLcode ftp_state_pwd(struct connectdata *conn)
{
CURLcode result;
/* send PWD to discover our entry point */
PPSENDF(&conn->proto.ftpc.pp, "PWD", NULL);
state(conn, FTP_PWD);
return CURLE_OK;
}
/* For the FTP "protocol connect" and "doing" phases only */
static int ftp_getsock(struct connectdata *conn,
curl_socket_t *socks,
int numsocks)
{
return Curl_pp_getsock(&conn->proto.ftpc.pp, socks, numsocks);
}
/* For the FTP "DO_MORE" phase only */
static int ftp_domore_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks)
{
struct ftp_conn *ftpc = &conn->proto.ftpc;
if(!numsocks)
return GETSOCK_BLANK;
/* When in DO_MORE state, we could be either waiting for us to connect to a
remote site, or we could wait for that site to connect to us. Or just
handle ordinary commands.
When waiting for a connect, we will be in FTP_STOP state and then we wait
for the secondary socket to become writeable. If we're in another state,
we're still handling commands on the control (primary) connection.
*/
switch(ftpc->state) {
case FTP_STOP:
break;
default:
return Curl_pp_getsock(&conn->proto.ftpc.pp, socks, numsocks);
}
socks[0] = conn->sock[SECONDARYSOCKET];
if(ftpc->wait_data_conn) {
socks[1] = conn->sock[FIRSTSOCKET];
return GETSOCK_READSOCK(0) | GETSOCK_READSOCK(1);
}
return GETSOCK_READSOCK(0);
}
/* This is called after the FTP_QUOTE state is passed.
ftp_state_cwd() sends the range of CWD commands to the server to change to
the correct directory. It may also need to send MKD commands to create
missing ones, if that option is enabled.
*/
static CURLcode ftp_state_cwd(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct ftp_conn *ftpc = &conn->proto.ftpc;
if(ftpc->cwddone)
/* already done and fine */
result = ftp_state_post_cwd(conn);
else {
ftpc->count2 = 0; /* count2 counts failed CWDs */
/* count3 is set to allow a MKD to fail once. In the case when first CWD
fails and then MKD fails (due to another session raced it to create the
dir) this then allows for a second try to CWD to it */
ftpc->count3 = (conn->data->set.ftp_create_missing_dirs==2)?1:0;
if(conn->bits.reuse && ftpc->entrypath) {
/* This is a re-used connection. Since we change directory to where the
transfer is taking place, we must first get back to the original dir
where we ended up after login: */
ftpc->count1 = 0; /* we count this as the first path, then we add one
for all upcoming ones in the ftp->dirs[] array */
PPSENDF(&conn->proto.ftpc.pp, "CWD %s", ftpc->entrypath);
state(conn, FTP_CWD);
}
else {
if(ftpc->dirdepth) {
ftpc->count1 = 1;
/* issue the first CWD, the rest is sent when the CWD responses are
received... */
PPSENDF(&conn->proto.ftpc.pp, "CWD %s", ftpc->dirs[ftpc->count1 -1]);
state(conn, FTP_CWD);
}
else {
/* No CWD necessary */
result = ftp_state_post_cwd(conn);
}
}
}
return result;
}
typedef enum {
EPRT,
PORT,
DONE
} ftpport;
static CURLcode ftp_state_use_port(struct connectdata *conn,
ftpport fcmd) /* start with this */
{
CURLcode result = CURLE_OK;
struct ftp_conn *ftpc = &conn->proto.ftpc;
struct SessionHandle *data=conn->data;
curl_socket_t portsock= CURL_SOCKET_BAD;
char myhost[256] = "";
struct Curl_sockaddr_storage ss;
Curl_addrinfo *res, *ai;
curl_socklen_t sslen;
char hbuf[NI_MAXHOST];
struct sockaddr *sa=(struct sockaddr *)&ss;
struct sockaddr_in * const sa4 = (void *)sa;
#ifdef ENABLE_IPV6
struct sockaddr_in6 * const sa6 = (void *)sa;
#endif
char tmp[1024];
static const char mode[][5] = { "EPRT", "PORT" };
int rc;
int error;
char *host = NULL;
char *string_ftpport = data->set.str[STRING_FTPPORT];
struct Curl_dns_entry *h=NULL;
unsigned short port_min = 0;
unsigned short port_max = 0;
unsigned short port;
bool possibly_non_local = TRUE;
char *addr = NULL;
/* Step 1, figure out what is requested,
* accepted format :
* (ipv4|ipv6|domain|interface)?(:port(-range)?)?
*/
if(data->set.str[STRING_FTPPORT] &&
(strlen(data->set.str[STRING_FTPPORT]) > 1)) {
#ifdef ENABLE_IPV6
size_t addrlen = INET6_ADDRSTRLEN > strlen(string_ftpport) ?
INET6_ADDRSTRLEN : strlen(string_ftpport);
#else
size_t addrlen = INET_ADDRSTRLEN > strlen(string_ftpport) ?
INET_ADDRSTRLEN : strlen(string_ftpport);
#endif
char *ip_start = string_ftpport;
char *ip_end = NULL;
char *port_start = NULL;
char *port_sep = NULL;
addr = calloc(addrlen+1, 1);
if(!addr)
return CURLE_OUT_OF_MEMORY;
#ifdef ENABLE_IPV6
if(*string_ftpport == '[') {
/* [ipv6]:port(-range) */
ip_start = string_ftpport + 1;
if((ip_end = strchr(string_ftpport, ']')) != NULL )
strncpy(addr, ip_start, ip_end - ip_start);
}
else
#endif
if(*string_ftpport == ':') {
/* :port */
ip_end = string_ftpport;
}
else if((ip_end = strchr(string_ftpport, ':')) != NULL) {
/* either ipv6 or (ipv4|domain|interface):port(-range) */
#ifdef ENABLE_IPV6
if(Curl_inet_pton(AF_INET6, string_ftpport, sa6) == 1) {
/* ipv6 */
port_min = port_max = 0;
strcpy(addr, string_ftpport);
ip_end = NULL; /* this got no port ! */
}
else
#endif
/* (ipv4|domain|interface):port(-range) */
strncpy(addr, string_ftpport, ip_end - ip_start );
}
else
/* ipv4|interface */
strcpy(addr, string_ftpport);
/* parse the port */
if(ip_end != NULL) {
if((port_start = strchr(ip_end, ':')) != NULL) {
port_min = curlx_ultous(strtoul(port_start+1, NULL, 10));
if((port_sep = strchr(port_start, '-')) != NULL) {
port_max = curlx_ultous(strtoul(port_sep + 1, NULL, 10));
}
else
port_max = port_min;
}
}
/* correct errors like:
* :1234-1230
* :-4711 , in this case port_min is (unsigned)-1,
* therefore port_min > port_max for all cases
* but port_max = (unsigned)-1
*/
if(port_min > port_max )
port_min = port_max = 0;
if(*addr != '\0') {
/* attempt to get the address of the given interface name */
if(!Curl_if2ip(conn->ip_addr->ai_family, addr,
hbuf, sizeof(hbuf)))
/* not an interface, use the given string as host name instead */
host = addr;
else
host = hbuf; /* use the hbuf for host name */
}
else
/* there was only a port(-range) given, default the host */
host = NULL;
} /* data->set.ftpport */
if(!host) {
/* not an interface and not a host name, get default by extracting
the IP from the control connection */
sslen = sizeof(ss);
if(getsockname(conn->sock[FIRSTSOCKET], sa, &sslen)) {
failf(data, "getsockname() failed: %s",
Curl_strerror(conn, SOCKERRNO) );
Curl_safefree(addr);
return CURLE_FTP_PORT_FAILED;
}
switch(sa->sa_family) {
#ifdef ENABLE_IPV6
case AF_INET6:
Curl_inet_ntop(sa->sa_family, &sa6->sin6_addr, hbuf, sizeof(hbuf));
break;
#endif
default:
Curl_inet_ntop(sa->sa_family, &sa4->sin_addr, hbuf, sizeof(hbuf));
break;
}
host = hbuf; /* use this host name */
possibly_non_local = FALSE; /* we know it is local now */
}
/* resolv ip/host to ip */
rc = Curl_resolv(conn, host, 0, &h);
if(rc == CURLRESOLV_PENDING)
(void)Curl_resolver_wait_resolv(conn, &h);
if(h) {
res = h->addr;
/* when we return from this function, we can forget about this entry
to we can unlock it now already */
Curl_resolv_unlock(data, h);
} /* (h) */
else
res = NULL; /* failure! */
if(res == NULL) {
failf(data, "failed to resolve the address provided to PORT: %s", host);
Curl_safefree(addr);
return CURLE_FTP_PORT_FAILED;
}
Curl_safefree(addr);
host = NULL;
/* step 2, create a socket for the requested address */
portsock = CURL_SOCKET_BAD;
error = 0;
for(ai = res; ai; ai = ai->ai_next) {
result = Curl_socket(conn, ai, NULL, &portsock);
if(result) {
error = SOCKERRNO;
continue;
}
break;
}
if(!ai) {
failf(data, "socket failure: %s", Curl_strerror(conn, error));
return CURLE_FTP_PORT_FAILED;
}
/* step 3, bind to a suitable local address */
memcpy(sa, ai->ai_addr, ai->ai_addrlen);
sslen = ai->ai_addrlen;
for(port = port_min; port <= port_max;) {
if(sa->sa_family == AF_INET)
sa4->sin_port = htons(port);
#ifdef ENABLE_IPV6
else
sa6->sin6_port = htons(port);
#endif
/* Try binding the given address. */
if(bind(portsock, sa, sslen) ) {
/* It failed. */
error = SOCKERRNO;
if(possibly_non_local && (error == EADDRNOTAVAIL)) {
/* The requested bind address is not local. Use the address used for
* the control connection instead and restart the port loop
*/
infof(data, "bind(port=%hu) on non-local address failed: %s\n", port,
Curl_strerror(conn, error) );
sslen = sizeof(ss);
if(getsockname(conn->sock[FIRSTSOCKET], sa, &sslen)) {
failf(data, "getsockname() failed: %s",
Curl_strerror(conn, SOCKERRNO) );
Curl_closesocket(conn, portsock);
return CURLE_FTP_PORT_FAILED;
}
port = port_min;
possibly_non_local = FALSE; /* don't try this again */
continue;
}
else if(error != EADDRINUSE && error != EACCES) {
failf(data, "bind(port=%hu) failed: %s", port,
Curl_strerror(conn, error) );
Curl_closesocket(conn, portsock);
return CURLE_FTP_PORT_FAILED;
}
}
else
break;
port++;
}
/* maybe all ports were in use already*/
if(port > port_max) {
failf(data, "bind() failed, we ran out of ports!");
Curl_closesocket(conn, portsock);
return CURLE_FTP_PORT_FAILED;
}
/* get the name again after the bind() so that we can extract the
port number it uses now */
sslen = sizeof(ss);
if(getsockname(portsock, (struct sockaddr *)sa, &sslen)) {
failf(data, "getsockname() failed: %s",
Curl_strerror(conn, SOCKERRNO) );
Curl_closesocket(conn, portsock);
return CURLE_FTP_PORT_FAILED;
}
/* step 4, listen on the socket */
if(listen(portsock, 1)) {
failf(data, "socket failure: %s", Curl_strerror(conn, SOCKERRNO));
Curl_closesocket(conn, portsock);
return CURLE_FTP_PORT_FAILED;
}
/* step 5, send the proper FTP command */
/* get a plain printable version of the numerical address to work with
below */
Curl_printable_address(ai, myhost, sizeof(myhost));
#ifdef ENABLE_IPV6
if(!conn->bits.ftp_use_eprt && conn->bits.ipv6)
/* EPRT is disabled but we are connected to a IPv6 host, so we ignore the
request and enable EPRT again! */
conn->bits.ftp_use_eprt = TRUE;
#endif
for(; fcmd != DONE; fcmd++) {
if(!conn->bits.ftp_use_eprt && (EPRT == fcmd))
/* if disabled, goto next */
continue;
if((PORT == fcmd) && sa->sa_family != AF_INET)
/* PORT is ipv4 only */
continue;
switch (sa->sa_family) {
case AF_INET:
port = ntohs(sa4->sin_port);
break;
#ifdef ENABLE_IPV6
case AF_INET6:
port = ntohs(sa6->sin6_port);
break;
#endif
default:
continue; /* might as well skip this */
}
if(EPRT == fcmd) {
/*
* Two fine examples from RFC2428;
*
* EPRT |1|132.235.1.2|6275|
*
* EPRT |2|1080::8:800:200C:417A|5282|
*/
result = Curl_pp_sendf(&ftpc->pp, "%s |%d|%s|%hu|", mode[fcmd],
sa->sa_family == AF_INET?1:2,
myhost, port);
if(result) {
failf(data, "Failure sending EPRT command: %s",
curl_easy_strerror(result));
Curl_closesocket(conn, portsock);
/* don't retry using PORT */
ftpc->count1 = PORT;
/* bail out */
state(conn, FTP_STOP);
return result;
}
break;
}
else if(PORT == fcmd) {
char *source = myhost;
char *dest = tmp;
/* translate x.x.x.x to x,x,x,x */
while(source && *source) {
if(*source == '.')
*dest=',';
else
*dest = *source;
dest++;
source++;
}
*dest = 0;
snprintf(dest, 20, ",%d,%d", (int)(port>>8), (int)(port&0xff));
result = Curl_pp_sendf(&ftpc->pp, "%s %s", mode[fcmd], tmp);
if(result) {
failf(data, "Failure sending PORT command: %s",
curl_easy_strerror(result));
Curl_closesocket(conn, portsock);
/* bail out */
state(conn, FTP_STOP);
return result;
}
break;
}
}
/* store which command was sent */
ftpc->count1 = fcmd;
/* we set the secondary socket variable to this for now, it is only so that
the cleanup function will close it in case we fail before the true
secondary stuff is made */
if(CURL_SOCKET_BAD != conn->sock[SECONDARYSOCKET])
Curl_closesocket(conn, conn->sock[SECONDARYSOCKET]);
conn->sock[SECONDARYSOCKET] = portsock;
/* this tcpconnect assignment below is a hackish work-around to make the
multi interface with active FTP work - as it will not wait for a
(passive) connect in Curl_is_connected().
The *proper* fix is to make sure that the active connection from the
server is done in a non-blocking way. Currently, it is still BLOCKING.
*/
conn->bits.tcpconnect[SECONDARYSOCKET] = TRUE;
state(conn, FTP_PORT);
return result;
}
static CURLcode ftp_state_use_pasv(struct connectdata *conn)
{
struct ftp_conn *ftpc = &conn->proto.ftpc;
CURLcode result = CURLE_OK;
/*
Here's the excecutive summary on what to do:
PASV is RFC959, expect:
227 Entering Passive Mode (a1,a2,a3,a4,p1,p2)
LPSV is RFC1639, expect:
228 Entering Long Passive Mode (4,4,a1,a2,a3,a4,2,p1,p2)
EPSV is RFC2428, expect:
229 Entering Extended Passive Mode (|||port|)
*/
static const char mode[][5] = { "EPSV", "PASV" };
int modeoff;
#ifdef PF_INET6
if(!conn->bits.ftp_use_epsv && conn->bits.ipv6)
/* EPSV is disabled but we are connected to a IPv6 host, so we ignore the
request and enable EPSV again! */
conn->bits.ftp_use_epsv = TRUE;
#endif
modeoff = conn->bits.ftp_use_epsv?0:1;
PPSENDF(&ftpc->pp, "%s", mode[modeoff]);
ftpc->count1 = modeoff;
state(conn, FTP_PASV);
infof(conn->data, "Connect data stream passively\n");
return result;
}
/* REST is the last command in the chain of commands when a "head"-like
request is made. Thus, if an actual transfer is to be made this is where
we take off for real. */
static CURLcode ftp_state_post_rest(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct FTP *ftp = conn->data->state.proto.ftp;
struct SessionHandle *data = conn->data;
if(ftp->transfer != FTPTRANSFER_BODY) {
/* doesn't transfer any data */
/* still possibly do PRE QUOTE jobs */
state(conn, FTP_RETR_PREQUOTE);
result = ftp_state_quote(conn, TRUE, FTP_RETR_PREQUOTE);
}
else if(data->set.ftp_use_port) {
/* We have chosen to use the PORT (or similar) command */
result = ftp_state_use_port(conn, EPRT);
}
else {
/* We have chosen (this is default) to use the PASV (or similar) command */
if(data->set.ftp_use_pret) {
/* The user has requested that we send a PRET command
to prepare the server for the upcoming PASV */
if(!conn->proto.ftpc.file) {
PPSENDF(&conn->proto.ftpc.pp, "PRET %s",
data->set.str[STRING_CUSTOMREQUEST]?
data->set.str[STRING_CUSTOMREQUEST]:
(data->set.ftp_list_only?"NLST":"LIST"));
}
else if(data->set.upload) {
PPSENDF(&conn->proto.ftpc.pp, "PRET STOR %s", conn->proto.ftpc.file);
}
else {
PPSENDF(&conn->proto.ftpc.pp, "PRET RETR %s", conn->proto.ftpc.file);
}
state(conn, FTP_PRET);
}
else {
result = ftp_state_use_pasv(conn);
}
}
return result;
}
static CURLcode ftp_state_post_size(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct FTP *ftp = conn->data->state.proto.ftp;
struct ftp_conn *ftpc = &conn->proto.ftpc;
if((ftp->transfer != FTPTRANSFER_BODY) && ftpc->file) {
/* if a "head"-like request is being made (on a file) */
/* Determine if server can respond to REST command and therefore
whether it supports range */
PPSENDF(&conn->proto.ftpc.pp, "REST %d", 0);
state(conn, FTP_REST);
}
else
result = ftp_state_post_rest(conn);
return result;
}
static CURLcode ftp_state_post_type(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct FTP *ftp = conn->data->state.proto.ftp;
struct ftp_conn *ftpc = &conn->proto.ftpc;
if((ftp->transfer == FTPTRANSFER_INFO) && ftpc->file) {
/* if a "head"-like request is being made (on a file) */
/* we know ftpc->file is a valid pointer to a file name */
PPSENDF(&ftpc->pp, "SIZE %s", ftpc->file);
state(conn, FTP_SIZE);
}
else
result = ftp_state_post_size(conn);
return result;
}
static CURLcode ftp_state_post_listtype(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
/* If this output is to be machine-parsed, the NLST command might be better
to use, since the LIST command output is not specified or standard in any
way. It has turned out that the NLST list output is not the same on all
servers either... */
/*
if FTPFILE_NOCWD was specified, we are currently in
the user's home directory, so we should add the path
as argument for the LIST / NLST / or custom command.
Whether the server will support this, is uncertain.
The other ftp_filemethods will CWD into dir/dir/ first and
then just do LIST (in that case: nothing to do here)
*/
char *cmd,*lstArg,*slashPos;
lstArg = NULL;
if((data->set.ftp_filemethod == FTPFILE_NOCWD) &&
data->state.path &&
data->state.path[0] &&
strchr(data->state.path,'/')) {
lstArg = strdup(data->state.path);
if(!lstArg)
return CURLE_OUT_OF_MEMORY;
/* Check if path does not end with /, as then we cut off the file part */
if(lstArg[strlen(lstArg) - 1] != '/') {
/* chop off the file part if format is dir/dir/file */
slashPos = strrchr(lstArg,'/');
if(slashPos)
*(slashPos+1) = '\0';
}
}
cmd = aprintf( "%s%s%s",
data->set.str[STRING_CUSTOMREQUEST]?
data->set.str[STRING_CUSTOMREQUEST]:
(data->set.ftp_list_only?"NLST":"LIST"),
lstArg? " ": "",
lstArg? lstArg: "" );
if(!cmd) {
if(lstArg)
free(lstArg);
return CURLE_OUT_OF_MEMORY;
}
result = Curl_pp_sendf(&conn->proto.ftpc.pp, "%s", cmd);
if(lstArg)
free(lstArg);
free(cmd);
if(result != CURLE_OK)
return result;
state(conn, FTP_LIST);
return result;
}
static CURLcode ftp_state_post_retrtype(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
/* We've sent the TYPE, now we must send the list of prequote strings */
result = ftp_state_quote(conn, TRUE, FTP_RETR_PREQUOTE);
return result;
}
static CURLcode ftp_state_post_stortype(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
/* We've sent the TYPE, now we must send the list of prequote strings */
result = ftp_state_quote(conn, TRUE, FTP_STOR_PREQUOTE);
return result;
}
static CURLcode ftp_state_post_mdtm(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct FTP *ftp = conn->data->state.proto.ftp;
struct SessionHandle *data = conn->data;
struct ftp_conn *ftpc = &conn->proto.ftpc;
/* If we have selected NOBODY and HEADER, it means that we only want file
information. Which in FTP can't be much more than the file size and
date. */
if(data->set.opt_no_body && ftpc->file &&
ftp_need_type(conn, data->set.prefer_ascii)) {
/* The SIZE command is _not_ RFC 959 specified, and therefor many servers
may not support it! It is however the only way we have to get a file's
size! */
ftp->transfer = FTPTRANSFER_INFO;
/* this means no actual transfer will be made */
/* Some servers return different sizes for different modes, and thus we
must set the proper type before we check the size */
result = ftp_nb_type(conn, data->set.prefer_ascii, FTP_TYPE);
if(result)
return result;
}
else
result = ftp_state_post_type(conn);
return result;
}
/* This is called after the CWD commands have been done in the beginning of
the DO phase */
static CURLcode ftp_state_post_cwd(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct ftp_conn *ftpc = &conn->proto.ftpc;
/* Requested time of file or time-depended transfer? */
if((data->set.get_filetime || data->set.timecondition) && ftpc->file) {
/* we have requested to get the modified-time of the file, this is a white
spot as the MDTM is not mentioned in RFC959 */
PPSENDF(&ftpc->pp, "MDTM %s", ftpc->file);
state(conn, FTP_MDTM);
}
else
result = ftp_state_post_mdtm(conn);
return result;
}
/* This is called after the TYPE and possible quote commands have been sent */
static CURLcode ftp_state_ul_setup(struct connectdata *conn,
bool sizechecked)
{
CURLcode result = CURLE_OK;
struct FTP *ftp = conn->data->state.proto.ftp;
struct SessionHandle *data = conn->data;
struct ftp_conn *ftpc = &conn->proto.ftpc;
int seekerr = CURL_SEEKFUNC_OK;
if((data->state.resume_from && !sizechecked) ||
((data->state.resume_from > 0) && sizechecked)) {
/* we're about to continue the uploading of a file */
/* 1. get already existing file's size. We use the SIZE command for this
which may not exist in the server! The SIZE command is not in
RFC959. */
/* 2. This used to set REST. But since we can do append, we
don't another ftp command. We just skip the source file
offset and then we APPEND the rest on the file instead */
/* 3. pass file-size number of bytes in the source file */
/* 4. lower the infilesize counter */
/* => transfer as usual */
if(data->state.resume_from < 0 ) {
/* Got no given size to start from, figure it out */
PPSENDF(&ftpc->pp, "SIZE %s", ftpc->file);
state(conn, FTP_STOR_SIZE);
return result;
}
/* enable append */
data->set.ftp_append = TRUE;
/* Let's read off the proper amount of bytes from the input. */
if(conn->seek_func) {
seekerr = conn->seek_func(conn->seek_client, data->state.resume_from,
SEEK_SET);
}
if(seekerr != CURL_SEEKFUNC_OK) {
if(seekerr != CURL_SEEKFUNC_CANTSEEK) {
failf(data, "Could not seek stream");
return CURLE_FTP_COULDNT_USE_REST;
}
/* seekerr == CURL_SEEKFUNC_CANTSEEK (can't seek to offset) */
else {
curl_off_t passed=0;
do {
size_t readthisamountnow =
(data->state.resume_from - passed > CURL_OFF_T_C(BUFSIZE)) ?
BUFSIZE : curlx_sotouz(data->state.resume_from - passed);
size_t actuallyread =
conn->fread_func(data->state.buffer, 1, readthisamountnow,
conn->fread_in);
passed += actuallyread;
if((actuallyread == 0) || (actuallyread > readthisamountnow)) {
/* this checks for greater-than only to make sure that the
CURL_READFUNC_ABORT return code still aborts */
failf(data, "Failed to read data");
return CURLE_FTP_COULDNT_USE_REST;
}
} while(passed < data->state.resume_from);
}
}
/* now, decrease the size of the read */
if(data->set.infilesize>0) {
data->set.infilesize -= data->state.resume_from;
if(data->set.infilesize <= 0) {
infof(data, "File already completely uploaded\n");
/* no data to transfer */
Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
/* Set ->transfer so that we won't get any error in
* ftp_done() because we didn't transfer anything! */
ftp->transfer = FTPTRANSFER_NONE;
state(conn, FTP_STOP);
return CURLE_OK;
}
}
/* we've passed, proceed as normal */
} /* resume_from */
PPSENDF(&ftpc->pp, data->set.ftp_append?"APPE %s":"STOR %s",
ftpc->file);
state(conn, FTP_STOR);
return result;
}
static CURLcode ftp_state_quote(struct connectdata *conn,
bool init,
ftpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct FTP *ftp = data->state.proto.ftp;
struct ftp_conn *ftpc = &conn->proto.ftpc;
bool quote=FALSE;
struct curl_slist *item;
switch(instate) {
case FTP_QUOTE:
default:
item = data->set.quote;
break;
case FTP_RETR_PREQUOTE:
case FTP_STOR_PREQUOTE:
item = data->set.prequote;
break;
case FTP_POSTQUOTE:
item = data->set.postquote;
break;
}
/*
* This state uses:
* 'count1' to iterate over the commands to send
* 'count2' to store wether to allow commands to fail
*/
if(init)
ftpc->count1 = 0;
else
ftpc->count1++;
if(item) {
int i = 0;
/* Skip count1 items in the linked list */
while((i< ftpc->count1) && item) {
item = item->next;
i++;
}
if(item) {
char *cmd = item->data;
if(cmd[0] == '*') {
cmd++;
ftpc->count2 = 1; /* the sent command is allowed to fail */
}
else
ftpc->count2 = 0; /* failure means cancel operation */
PPSENDF(&ftpc->pp, "%s", cmd);
state(conn, instate);
quote = TRUE;
}
}
if(!quote) {
/* No more quote to send, continue to ... */
switch(instate) {
case FTP_QUOTE:
default:
result = ftp_state_cwd(conn);
break;
case FTP_RETR_PREQUOTE:
if(ftp->transfer != FTPTRANSFER_BODY)
state(conn, FTP_STOP);
else {
if(ftpc->known_filesize != -1) {
Curl_pgrsSetDownloadSize(data, ftpc->known_filesize);
result = ftp_state_post_retr_size(conn, ftpc->known_filesize);
}
else {
PPSENDF(&ftpc->pp, "SIZE %s", ftpc->file);
state(conn, FTP_RETR_SIZE);
}
}
break;
case FTP_STOR_PREQUOTE:
result = ftp_state_ul_setup(conn, FALSE);
break;
case FTP_POSTQUOTE:
break;
}
}
return result;
}
static CURLcode ftp_state_pasv_resp(struct connectdata *conn,
int ftpcode)
{
struct ftp_conn *ftpc = &conn->proto.ftpc;
CURLcode result;
struct SessionHandle *data=conn->data;
Curl_addrinfo *conninfo;
struct Curl_dns_entry *addr=NULL;
int rc;
unsigned short connectport; /* the local port connect() should use! */
unsigned short newport=0; /* remote port */
bool connected;
/* newhost must be able to hold a full IP-style address in ASCII, which
in the IPv6 case means 5*8-1 = 39 letters */
#define NEWHOST_BUFSIZE 48
char newhost[NEWHOST_BUFSIZE];
char *str=&data->state.buffer[4]; /* start on the first letter */
if((ftpc->count1 == 0) &&
(ftpcode == 229)) {
/* positive EPSV response */
char *ptr = strchr(str, '(');
if(ptr) {
unsigned int num;
char separator[4];
ptr++;
if(5 == sscanf(ptr, "%c%c%c%u%c",
&separator[0],
&separator[1],
&separator[2],
&num,
&separator[3])) {
const char sep1 = separator[0];
int i;
/* The four separators should be identical, or else this is an oddly
formatted reply and we bail out immediately. */
for(i=1; i<4; i++) {
if(separator[i] != sep1) {
ptr=NULL; /* set to NULL to signal error */
break;
}
}
if(ptr) {
newport = (unsigned short)(num & 0xffff);
if(conn->bits.tunnel_proxy ||
conn->proxytype == CURLPROXY_SOCKS5 ||
conn->proxytype == CURLPROXY_SOCKS5_HOSTNAME ||
conn->proxytype == CURLPROXY_SOCKS4 ||
conn->proxytype == CURLPROXY_SOCKS4A)
/* proxy tunnel -> use other host info because ip_addr_str is the
proxy address not the ftp host */
snprintf(newhost, sizeof(newhost), "%s", conn->host.name);
else
/* use the same IP we are already connected to */
snprintf(newhost, NEWHOST_BUFSIZE, "%s", conn->ip_addr_str);
}
}
else
ptr=NULL;
}
if(!ptr) {
failf(data, "Weirdly formatted EPSV reply");
return CURLE_FTP_WEIRD_PASV_REPLY;
}
}
else if((ftpc->count1 == 1) &&
(ftpcode == 227)) {
/* positive PASV response */
int ip[4];
int port[2];
/*
* Scan for a sequence of six comma-separated numbers and use them as
* IP+port indicators.
*
* Found reply-strings include:
* "227 Entering Passive Mode (127,0,0,1,4,51)"
* "227 Data transfer will passively listen to 127,0,0,1,4,51"
* "227 Entering passive mode. 127,0,0,1,4,51"
*/
while(*str) {
if(6 == sscanf(str, "%d,%d,%d,%d,%d,%d",
&ip[0], &ip[1], &ip[2], &ip[3],
&port[0], &port[1]))
break;
str++;
}
if(!*str) {
failf(data, "Couldn't interpret the 227-response");
return CURLE_FTP_WEIRD_227_FORMAT;
}
/* we got OK from server */
if(data->set.ftp_skip_ip) {
/* told to ignore the remotely given IP but instead use the one we used
for the control connection */
infof(data, "Skips %d.%d.%d.%d for data connection, uses %s instead\n",
ip[0], ip[1], ip[2], ip[3],
conn->ip_addr_str);
if(conn->bits.tunnel_proxy ||
conn->proxytype == CURLPROXY_SOCKS5 ||
conn->proxytype == CURLPROXY_SOCKS5_HOSTNAME ||
conn->proxytype == CURLPROXY_SOCKS4 ||
conn->proxytype == CURLPROXY_SOCKS4A)
/* proxy tunnel -> use other host info because ip_addr_str is the
proxy address not the ftp host */
snprintf(newhost, sizeof(newhost), "%s", conn->host.name);
else
snprintf(newhost, sizeof(newhost), "%s", conn->ip_addr_str);
}
else
snprintf(newhost, sizeof(newhost),
"%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
newport = (unsigned short)(((port[0]<<8) + port[1]) & 0xffff);
}
else if(ftpc->count1 == 0) {
/* EPSV failed, move on to PASV */
/* disable it for next transfer */
conn->bits.ftp_use_epsv = FALSE;
infof(data, "disabling EPSV usage\n");
PPSENDF(&ftpc->pp, "PASV", NULL);
ftpc->count1++;
/* remain in the FTP_PASV state */
return result;
}
else {
failf(data, "Bad PASV/EPSV response: %03d", ftpcode);
return CURLE_FTP_WEIRD_PASV_REPLY;
}
if(data->set.str[STRING_PROXY] && *data->set.str[STRING_PROXY]) {
/*
* This is a tunnel through a http proxy and we need to connect to the
* proxy again here.
*
* We don't want to rely on a former host lookup that might've expired
* now, instead we remake the lookup here and now!
*/
rc = Curl_resolv(conn, conn->proxy.name, (int)conn->port, &addr);
if(rc == CURLRESOLV_PENDING)
/* BLOCKING, ignores the return code but 'addr' will be NULL in
case of failure */
(void)Curl_resolver_wait_resolv(conn, &addr);
connectport =
(unsigned short)conn->port; /* we connect to the proxy's port */
if(!addr) {
failf(data, "Can't resolve proxy host %s:%hu",
conn->proxy.name, connectport);
return CURLE_FTP_CANT_GET_HOST;
}
}
else {
/* normal, direct, ftp connection */
rc = Curl_resolv(conn, newhost, newport, &addr);
if(rc == CURLRESOLV_PENDING)
/* BLOCKING */
(void)Curl_resolver_wait_resolv(conn, &addr);
connectport = newport; /* we connect to the remote port */
if(!addr) {
failf(data, "Can't resolve new host %s:%hu", newhost, connectport);
return CURLE_FTP_CANT_GET_HOST;
}
}
result = Curl_connecthost(conn,
addr,
&conn->sock[SECONDARYSOCKET],
&conninfo,
&connected);
Curl_resolv_unlock(data, addr); /* we're done using this address */
if(result && ftpc->count1 == 0 && ftpcode == 229) {
infof(data, "got positive EPSV response, but can't connect. "
"Disabling EPSV\n");
/* disable it for next transfer */
conn->bits.ftp_use_epsv = FALSE;
data->state.errorbuf = FALSE; /* allow error message to get rewritten */
PPSENDF(&ftpc->pp, "PASV", NULL);
ftpc->count1++;
/* remain in the FTP_PASV state */
return result;
}
if(result)
return result;
conn->bits.tcpconnect[SECONDARYSOCKET] = connected;
/*
* When this is used from the multi interface, this might've returned with
* the 'connected' set to FALSE and thus we are now awaiting a non-blocking
* connect to connect and we should not be "hanging" here waiting.
*/
if(data->set.verbose)
/* this just dumps information about this second connection */
ftp_pasv_verbose(conn, conninfo, newhost, connectport);
switch(conn->proxytype) {
/* FIX: this MUST wait for a proper connect first if 'connected' is
* FALSE */
case CURLPROXY_SOCKS5:
case CURLPROXY_SOCKS5_HOSTNAME:
result = Curl_SOCKS5(conn->proxyuser, conn->proxypasswd, newhost, newport,
SECONDARYSOCKET, conn);
break;
case CURLPROXY_SOCKS4:
result = Curl_SOCKS4(conn->proxyuser, newhost, newport,
SECONDARYSOCKET, conn, FALSE);
break;
case CURLPROXY_SOCKS4A:
result = Curl_SOCKS4(conn->proxyuser, newhost, newport,
SECONDARYSOCKET, conn, TRUE);
break;
case CURLPROXY_HTTP:
case CURLPROXY_HTTP_1_0:
/* do nothing here. handled later. */
break;
default:
failf(data, "unknown proxytype option given");
result = CURLE_COULDNT_CONNECT;
break;
}
if(result)
return result;
if(conn->bits.tunnel_proxy && conn->bits.httpproxy) {
/* FIX: this MUST wait for a proper connect first if 'connected' is
* FALSE */
/* BLOCKING */
/* We want "seamless" FTP operations through HTTP proxy tunnel */
/* Curl_proxyCONNECT is based on a pointer to a struct HTTP at the member
* conn->proto.http; we want FTP through HTTP and we have to change the
* member temporarily for connecting to the HTTP proxy. After
* Curl_proxyCONNECT we have to set back the member to the original struct
* FTP pointer
*/
struct HTTP http_proxy;
struct FTP *ftp_save = data->state.proto.ftp;
memset(&http_proxy, 0, sizeof(http_proxy));
data->state.proto.http = &http_proxy;
result = Curl_proxyCONNECT(conn, SECONDARYSOCKET, newhost, newport);
data->state.proto.ftp = ftp_save;
if(result)
return result;
}
conn->bits.tcpconnect[SECONDARYSOCKET] = TRUE;
state(conn, FTP_STOP); /* this phase is completed */
return result;
}
static CURLcode ftp_state_port_resp(struct connectdata *conn,
int ftpcode)
{
struct SessionHandle *data = conn->data;
struct ftp_conn *ftpc = &conn->proto.ftpc;
ftpport fcmd = (ftpport)ftpc->count1;
CURLcode result = CURLE_OK;
if(ftpcode != 200) {
/* the command failed */
if(EPRT == fcmd) {
infof(data, "disabling EPRT usage\n");
conn->bits.ftp_use_eprt = FALSE;
}
fcmd++;
if(fcmd == DONE) {
failf(data, "Failed to do PORT");
result = CURLE_FTP_PORT_FAILED;
}
else
/* try next */
result = ftp_state_use_port(conn, fcmd);
}
else {
infof(data, "Connect data stream actively\n");
state(conn, FTP_STOP); /* end of DO phase */
}
return result;
}
static CURLcode ftp_state_mdtm_resp(struct connectdata *conn,
int ftpcode)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data=conn->data;
struct FTP *ftp = data->state.proto.ftp;
struct ftp_conn *ftpc = &conn->proto.ftpc;
switch(ftpcode) {
case 213:
{
/* we got a time. Format should be: "YYYYMMDDHHMMSS[.sss]" where the
last .sss part is optional and means fractions of a second */
int year, month, day, hour, minute, second;
char *buf = data->state.buffer;
if(6 == sscanf(buf+4, "%04d%02d%02d%02d%02d%02d",
&year, &month, &day, &hour, &minute, &second)) {
/* we have a time, reformat it */
time_t secs=time(NULL);
/* using the good old yacc/bison yuck */
snprintf(buf, sizeof(conn->data->state.buffer),
"%04d%02d%02d %02d:%02d:%02d GMT",
year, month, day, hour, minute, second);
/* now, convert this into a time() value: */
data->info.filetime = (long)curl_getdate(buf, &secs);
}
#ifdef CURL_FTP_HTTPSTYLE_HEAD
/* If we asked for a time of the file and we actually got one as well,
we "emulate" a HTTP-style header in our output. */
if(data->set.opt_no_body &&
ftpc->file &&
data->set.get_filetime &&
(data->info.filetime>=0) ) {
time_t filetime = (time_t)data->info.filetime;
struct tm buffer;
const struct tm *tm = &buffer;
result = Curl_gmtime(filetime, &buffer);
if(result)
return result;
/* format: "Tue, 15 Nov 1994 12:45:26" */
snprintf(buf, BUFSIZE-1,
"Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n",
Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
tm->tm_mday,
Curl_month[tm->tm_mon],
tm->tm_year + 1900,
tm->tm_hour,
tm->tm_min,
tm->tm_sec);
result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);
if(result)
return result;
} /* end of a ridiculous amount of conditionals */
#endif
}
break;
default:
infof(data, "unsupported MDTM reply format\n");
break;
case 550: /* "No such file or directory" */
failf(data, "Given file does not exist");
result = CURLE_FTP_COULDNT_RETR_FILE;
break;
}
if(data->set.timecondition) {
if((data->info.filetime > 0) && (data->set.timevalue > 0)) {
switch(data->set.timecondition) {
case CURL_TIMECOND_IFMODSINCE:
default:
if(data->info.filetime <= data->set.timevalue) {
infof(data, "The requested document is not new enough\n");
ftp->transfer = FTPTRANSFER_NONE; /* mark to not transfer data */
data->info.timecond = TRUE;
state(conn, FTP_STOP);
return CURLE_OK;
}
break;
case CURL_TIMECOND_IFUNMODSINCE:
if(data->info.filetime > data->set.timevalue) {
infof(data, "The requested document is not old enough\n");
ftp->transfer = FTPTRANSFER_NONE; /* mark to not transfer data */
data->info.timecond = TRUE;
state(conn, FTP_STOP);
return CURLE_OK;
}
break;
} /* switch */
}
else {
infof(data, "Skipping time comparison\n");
}
}
if(!result)
result = ftp_state_post_mdtm(conn);
return result;
}
static CURLcode ftp_state_type_resp(struct connectdata *conn,
int ftpcode,
ftpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data=conn->data;
if(ftpcode/100 != 2) {
/* "sasserftpd" and "(u)r(x)bot ftpd" both responds with 226 after a
successful 'TYPE I'. While that is not as RFC959 says, it is still a
positive response code and we allow that. */
failf(data, "Couldn't set desired mode");
return CURLE_FTP_COULDNT_SET_TYPE;
}
if(ftpcode != 200)
infof(data, "Got a %03d response code instead of the assumed 200\n",
ftpcode);
if(instate == FTP_TYPE)
result = ftp_state_post_type(conn);
else if(instate == FTP_LIST_TYPE)
result = ftp_state_post_listtype(conn);
else if(instate == FTP_RETR_TYPE)
result = ftp_state_post_retrtype(conn);
else if(instate == FTP_STOR_TYPE)
result = ftp_state_post_stortype(conn);
return result;
}
static CURLcode ftp_state_post_retr_size(struct connectdata *conn,
curl_off_t filesize)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data=conn->data;
struct FTP *ftp = data->state.proto.ftp;
struct ftp_conn *ftpc = &conn->proto.ftpc;
if(data->set.max_filesize && (filesize > data->set.max_filesize)) {
failf(data, "Maximum file size exceeded");
return CURLE_FILESIZE_EXCEEDED;
}
ftp->downloadsize = filesize;
if(data->state.resume_from) {
/* We always (attempt to) get the size of downloads, so it is done before
this even when not doing resumes. */
if(filesize == -1) {
infof(data, "ftp server doesn't support SIZE\n");
/* We couldn't get the size and therefore we can't know if there really
is a part of the file left to get, although the server will just
close the connection when we start the connection so it won't cause
us any harm, just not make us exit as nicely. */
}
else {
/* We got a file size report, so we check that there actually is a
part of the file left to get, or else we go home. */
if(data->state.resume_from< 0) {
/* We're supposed to download the last abs(from) bytes */
if(filesize < -data->state.resume_from) {
failf(data, "Offset (%" FORMAT_OFF_T
") was beyond file size (%" FORMAT_OFF_T ")",
data->state.resume_from, filesize);
return CURLE_BAD_DOWNLOAD_RESUME;
}
/* convert to size to download */
ftp->downloadsize = -data->state.resume_from;
/* download from where? */
data->state.resume_from = filesize - ftp->downloadsize;
}
else {
if(filesize < data->state.resume_from) {
failf(data, "Offset (%" FORMAT_OFF_T
") was beyond file size (%" FORMAT_OFF_T ")",
data->state.resume_from, filesize);
return CURLE_BAD_DOWNLOAD_RESUME;
}
/* Now store the number of bytes we are expected to download */
ftp->downloadsize = filesize-data->state.resume_from;
}
}
if(ftp->downloadsize == 0) {
/* no data to transfer */
Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
infof(data, "File already completely downloaded\n");
/* Set ->transfer so that we won't get any error in ftp_done()
* because we didn't transfer the any file */
ftp->transfer = FTPTRANSFER_NONE;
state(conn, FTP_STOP);
return CURLE_OK;
}
/* Set resume file transfer offset */
infof(data, "Instructs server to resume from offset %" FORMAT_OFF_T
"\n", data->state.resume_from);
PPSENDF(&ftpc->pp, "REST %" FORMAT_OFF_T, data->state.resume_from);
state(conn, FTP_RETR_REST);
}
else {
/* no resume */
PPSENDF(&ftpc->pp, "RETR %s", ftpc->file);
state(conn, FTP_RETR);
}
return result;
}
static CURLcode ftp_state_size_resp(struct connectdata *conn,
int ftpcode,
ftpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data=conn->data;
curl_off_t filesize;
char *buf = data->state.buffer;
/* get the size from the ascii string: */
filesize = (ftpcode == 213)?curlx_strtoofft(buf+4, NULL, 0):-1;
if(instate == FTP_SIZE) {
#ifdef CURL_FTP_HTTPSTYLE_HEAD
if(-1 != filesize) {
snprintf(buf, sizeof(data->state.buffer),
"Content-Length: %" FORMAT_OFF_T "\r\n", filesize);
result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);
if(result)
return result;
}
#endif
Curl_pgrsSetDownloadSize(data, filesize);
result = ftp_state_post_size(conn);
}
else if(instate == FTP_RETR_SIZE) {
Curl_pgrsSetDownloadSize(data, filesize);
result = ftp_state_post_retr_size(conn, filesize);
}
else if(instate == FTP_STOR_SIZE) {
data->state.resume_from = filesize;
result = ftp_state_ul_setup(conn, TRUE);
}
return result;
}
static CURLcode ftp_state_rest_resp(struct connectdata *conn,
int ftpcode,
ftpstate instate)
{
CURLcode result = CURLE_OK;
struct ftp_conn *ftpc = &conn->proto.ftpc;
switch(instate) {
case FTP_REST:
default:
#ifdef CURL_FTP_HTTPSTYLE_HEAD
if(ftpcode == 350) {
char buffer[24]= { "Accept-ranges: bytes\r\n" };
result = Curl_client_write(conn, CLIENTWRITE_BOTH, buffer, 0);
if(result)
return result;
}
#endif
result = ftp_state_post_rest(conn);
break;
case FTP_RETR_REST:
if(ftpcode != 350) {
failf(conn->data, "Couldn't use REST");
result = CURLE_FTP_COULDNT_USE_REST;
}
else {
PPSENDF(&ftpc->pp, "RETR %s", ftpc->file);
state(conn, FTP_RETR);
}
break;
}
return result;
}
static CURLcode ftp_state_stor_resp(struct connectdata *conn,
int ftpcode, ftpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
if(ftpcode>=400) {
failf(data, "Failed FTP upload: %0d", ftpcode);
/* oops, we never close the sockets! */
return CURLE_UPLOAD_FAILED;
}
conn->proto.ftpc.state_saved = instate;
/* PORT means we are now awaiting the server to connect to us. */
if(data->set.ftp_use_port) {
bool connected;
result = AllowServerConnect(conn, &connected);
if(result)
return result;
if(!connected) {
struct ftp_conn *ftpc = &conn->proto.ftpc;
infof(data, "Data conn was not available immediately\n");
/* as there's not necessarily an immediate action on the control
connection now, we halt the state machine */
state(conn, FTP_STOP);
ftpc->wait_data_conn = TRUE;
}
return CURLE_OK;
}
else
return InitiateTransfer(conn);
}
/* for LIST and RETR responses */
static CURLcode ftp_state_get_resp(struct connectdata *conn,
int ftpcode,
ftpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct FTP *ftp = data->state.proto.ftp;
char *buf = data->state.buffer;
if((ftpcode == 150) || (ftpcode == 125)) {
/*
A;
150 Opening BINARY mode data connection for /etc/passwd (2241
bytes). (ok, the file is being transferred)
B:
150 Opening ASCII mode data connection for /bin/ls
C:
150 ASCII data connection for /bin/ls (137.167.104.91,37445) (0 bytes).
D:
150 Opening ASCII mode data connection for [file] (0.0.0.0,0) (545 bytes)
E:
125 Data connection already open; Transfer starting. */
curl_off_t size=-1; /* default unknown size */
/*
* It appears that there are FTP-servers that return size 0 for files when
* SIZE is used on the file while being in BINARY mode. To work around
* that (stupid) behavior, we attempt to parse the RETR response even if
* the SIZE returned size zero.
*
* Debugging help from Salvatore Sorrentino on February 26, 2003.
*/
if((instate != FTP_LIST) &&
!data->set.prefer_ascii &&
(ftp->downloadsize < 1)) {
/*
* It seems directory listings either don't show the size or very
* often uses size 0 anyway. ASCII transfers may very well turn out
* that the transferred amount of data is not the same as this line
* tells, why using this number in those cases only confuses us.
*
* Example D above makes this parsing a little tricky */
char *bytes;
bytes=strstr(buf, " bytes");
if(bytes--) {
long in=(long)(bytes-buf);
/* this is a hint there is size information in there! ;-) */
while(--in) {
/* scan for the left parenthesis and break there */
if('(' == *bytes)
break;
/* skip only digits */
if(!ISDIGIT(*bytes)) {
bytes=NULL;
break;
}
/* one more estep backwards */
bytes--;
}
/* if we have nothing but digits: */
if(bytes++) {
/* get the number! */
size = curlx_strtoofft(bytes, NULL, 0);
}
}
}
else if(ftp->downloadsize > -1)
size = ftp->downloadsize;
if(size > data->req.maxdownload && data->req.maxdownload > 0)
size = data->req.size = data->req.maxdownload;
else if((instate != FTP_LIST) && (data->set.prefer_ascii))
size = -1; /* kludge for servers that understate ASCII mode file size */
infof(data, "Maxdownload = %" FORMAT_OFF_T "\n", data->req.maxdownload);
if(instate != FTP_LIST)
infof(data, "Getting file with size: %" FORMAT_OFF_T "\n", size);
/* FTP download: */
conn->proto.ftpc.state_saved = instate;
conn->proto.ftpc.retr_size_saved = size;
if(data->set.ftp_use_port) {
bool connected;
result = AllowServerConnect(conn, &connected);
if(result)
return result;
if(!connected) {
struct ftp_conn *ftpc = &conn->proto.ftpc;
infof(data, "Data conn was not available immediately\n");
state(conn, FTP_STOP);
ftpc->wait_data_conn = TRUE;
}
}
else
return InitiateTransfer(conn);
}
else {
if((instate == FTP_LIST) && (ftpcode == 450)) {
/* simply no matching files in the dir listing */
ftp->transfer = FTPTRANSFER_NONE; /* don't download anything */
state(conn, FTP_STOP); /* this phase is over */
}
else {
failf(data, "RETR response: %03d", ftpcode);
return instate == FTP_RETR && ftpcode == 550?
CURLE_REMOTE_FILE_NOT_FOUND:
CURLE_FTP_COULDNT_RETR_FILE;
}
}
return result;
}
/* after USER, PASS and ACCT */
static CURLcode ftp_state_loggedin(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
#ifdef HAVE_KRB4
if(conn->data->set.krb) {
/* We may need to issue a KAUTH here to have access to the files
* do it if user supplied a password
*/
if(conn->passwd && *conn->passwd) {
/* BLOCKING */
result = Curl_krb_kauth(conn);
if(result)
return result;
}
}
#endif
if(conn->ssl[FIRSTSOCKET].use) {
/* PBSZ = PROTECTION BUFFER SIZE.
The 'draft-murray-auth-ftp-ssl' (draft 12, page 7) says:
Specifically, the PROT command MUST be preceded by a PBSZ
command and a PBSZ command MUST be preceded by a successful
security data exchange (the TLS negotiation in this case)
... (and on page 8):
Thus the PBSZ command must still be issued, but must have a
parameter of '0' to indicate that no buffering is taking place
and the data connection should not be encapsulated.
*/
PPSENDF(&conn->proto.ftpc.pp, "PBSZ %d", 0);
state(conn, FTP_PBSZ);
}
else {
result = ftp_state_pwd(conn);
}
return result;
}
/* for USER and PASS responses */
static CURLcode ftp_state_user_resp(struct connectdata *conn,
int ftpcode,
ftpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct FTP *ftp = data->state.proto.ftp;
struct ftp_conn *ftpc = &conn->proto.ftpc;
(void)instate; /* no use for this yet */
/* some need password anyway, and others just return 2xx ignored */
if((ftpcode == 331) && (ftpc->state == FTP_USER)) {
/* 331 Password required for ...
(the server requires to send the user's password too) */
PPSENDF(&ftpc->pp, "PASS %s", ftp->passwd?ftp->passwd:"");
state(conn, FTP_PASS);
}
else if(ftpcode/100 == 2) {
/* 230 User ... logged in.
(the user logged in with or without password) */
result = ftp_state_loggedin(conn);
}
else if(ftpcode == 332) {
if(data->set.str[STRING_FTP_ACCOUNT]) {
PPSENDF(&ftpc->pp, "ACCT %s", data->set.str[STRING_FTP_ACCOUNT]);
state(conn, FTP_ACCT);
}
else {
failf(data, "ACCT requested but none available");
result = CURLE_LOGIN_DENIED;
}
}
else {
/* All other response codes, like:
530 User ... access denied
(the server denies to log the specified user) */
if(conn->data->set.str[STRING_FTP_ALTERNATIVE_TO_USER] &&
!conn->data->state.ftp_trying_alternative) {
/* Ok, USER failed. Let's try the supplied command. */
PPSENDF(&conn->proto.ftpc.pp, "%s",
conn->data->set.str[STRING_FTP_ALTERNATIVE_TO_USER]);
conn->data->state.ftp_trying_alternative = TRUE;
state(conn, FTP_USER);
result = CURLE_OK;
}
else {
failf(data, "Access denied: %03d", ftpcode);
result = CURLE_LOGIN_DENIED;
}
}
return result;
}
/* for ACCT response */
static CURLcode ftp_state_acct_resp(struct connectdata *conn,
int ftpcode)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
if(ftpcode != 230) {
failf(data, "ACCT rejected by server: %03d", ftpcode);
result = CURLE_FTP_WEIRD_PASS_REPLY; /* FIX */
}
else
result = ftp_state_loggedin(conn);
return result;
}
static CURLcode ftp_statemach_act(struct connectdata *conn)
{
CURLcode result;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
struct SessionHandle *data=conn->data;
int ftpcode;
struct ftp_conn *ftpc = &conn->proto.ftpc;
struct pingpong *pp = &ftpc->pp;
static const char ftpauth[][4] = { "SSL", "TLS" };
size_t nread = 0;
if(pp->sendleft)
return Curl_pp_flushsend(pp);
result = ftp_readresp(sock, pp, &ftpcode, &nread);
if(result)
return result;
if(ftpcode) {
/* we have now received a full FTP server response */
switch(ftpc->state) {
case FTP_WAIT220:
if(ftpcode != 220) {
failf(data, "Got a %03d ftp-server response when 220 was expected",
ftpcode);
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
/* We have received a 220 response fine, now we proceed. */
#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
if(data->set.krb) {
/* If not anonymous login, try a secure login. Note that this
procedure is still BLOCKING. */
Curl_sec_request_prot(conn, "private");
/* We set private first as default, in case the line below fails to
set a valid level */
Curl_sec_request_prot(conn, data->set.str[STRING_KRB_LEVEL]);
if(Curl_sec_login(conn) != CURLE_OK)
infof(data, "Logging in with password in cleartext!\n");
else
infof(data, "Authentication successful\n");
}
#endif
if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) {
/* We don't have a SSL/TLS connection yet, but FTPS is
requested. Try a FTPS connection now */
ftpc->count3=0;
switch(data->set.ftpsslauth) {
case CURLFTPAUTH_DEFAULT:
case CURLFTPAUTH_SSL:
ftpc->count2 = 1; /* add one to get next */
ftpc->count1 = 0;
break;
case CURLFTPAUTH_TLS:
ftpc->count2 = -1; /* subtract one to get next */
ftpc->count1 = 1;
break;
default:
failf(data, "unsupported parameter to CURLOPT_FTPSSLAUTH: %d",
(int)data->set.ftpsslauth);
return CURLE_UNKNOWN_OPTION; /* we don't know what to do */
}
PPSENDF(&ftpc->pp, "AUTH %s", ftpauth[ftpc->count1]);
state(conn, FTP_AUTH);
}
else {
result = ftp_state_user(conn);
if(result)
return result;
}
break;
case FTP_AUTH:
/* we have gotten the response to a previous AUTH command */
/* RFC2228 (page 5) says:
*
* If the server is willing to accept the named security mechanism,
* and does not require any security data, it must respond with
* reply code 234/334.
*/
if((ftpcode == 234) || (ftpcode == 334)) {
/* Curl_ssl_connect is BLOCKING */
result = Curl_ssl_connect(conn, FIRSTSOCKET);
if(CURLE_OK == result) {
conn->ssl[SECONDARYSOCKET].use = FALSE; /* clear-text data */
result = ftp_state_user(conn);
}
}
else if(ftpc->count3 < 1) {
ftpc->count3++;
ftpc->count1 += ftpc->count2; /* get next attempt */
result = Curl_pp_sendf(&ftpc->pp, "AUTH %s", ftpauth[ftpc->count1]);
/* remain in this same state */
}
else {
if(data->set.use_ssl > CURLUSESSL_TRY)
/* we failed and CURLUSESSL_CONTROL or CURLUSESSL_ALL is set */
result = CURLE_USE_SSL_FAILED;
else
/* ignore the failure and continue */
result = ftp_state_user(conn);
}
if(result)
return result;
break;
case FTP_USER:
case FTP_PASS:
result = ftp_state_user_resp(conn, ftpcode, ftpc->state);
break;
case FTP_ACCT:
result = ftp_state_acct_resp(conn, ftpcode);
break;
case FTP_PBSZ:
PPSENDF(&ftpc->pp, "PROT %c",
data->set.use_ssl == CURLUSESSL_CONTROL ? 'C' : 'P');
state(conn, FTP_PROT);
break;
case FTP_PROT:
if(ftpcode/100 == 2)
/* We have enabled SSL for the data connection! */
conn->ssl[SECONDARYSOCKET].use =
(data->set.use_ssl != CURLUSESSL_CONTROL) ? TRUE : FALSE;
/* FTP servers typically responds with 500 if they decide to reject
our 'P' request */
else if(data->set.use_ssl > CURLUSESSL_CONTROL)
/* we failed and bails out */
return CURLE_USE_SSL_FAILED;
if(data->set.ftp_ccc) {
/* CCC - Clear Command Channel
*/
PPSENDF(&ftpc->pp, "CCC", NULL);
state(conn, FTP_CCC);
}
else {
result = ftp_state_pwd(conn);
if(result)
return result;
}
break;
case FTP_CCC:
if(ftpcode < 500) {
/* First shut down the SSL layer (note: this call will block) */
result = Curl_ssl_shutdown(conn, FIRSTSOCKET);
if(result) {
failf(conn->data, "Failed to clear the command channel (CCC)");
return result;
}
}
/* Then continue as normal */
result = ftp_state_pwd(conn);
if(result)
return result;
break;
case FTP_PWD:
if(ftpcode == 257) {
char *ptr=&data->state.buffer[4]; /* start on the first letter */
char *dir;
char *store;
dir = malloc(nread + 1);
if(!dir)
return CURLE_OUT_OF_MEMORY;
/* Reply format is like
257<space>"<directory-name>"<space><commentary> and the RFC959
says
The directory name can contain any character; embedded
double-quotes should be escaped by double-quotes (the
"quote-doubling" convention).
*/
if('\"' == *ptr) {
/* it started good */
ptr++;
for(store = dir; *ptr;) {
if('\"' == *ptr) {
if('\"' == ptr[1]) {
/* "quote-doubling" */
*store = ptr[1];
ptr++;
}
else {
/* end of path */
*store = '\0'; /* zero terminate */
break; /* get out of this loop */
}
}
else
*store = *ptr;
store++;
ptr++;
}
/* If the path name does not look like an absolute path (i.e.: it
does not start with a '/'), we probably need some server-dependent
adjustments. For example, this is the case when connecting to
an OS400 FTP server: this server supports two name syntaxes,
the default one being incompatible with standard pathes. In
addition, this server switches automatically to the regular path
syntax when one is encountered in a command: this results in
having an entrypath in the wrong syntax when later used in CWD.
The method used here is to check the server OS: we do it only
if the path name looks strange to minimize overhead on other
systems. */
if(!ftpc->server_os && dir[0] != '/') {
result = Curl_pp_sendf(&ftpc->pp, "SYST", NULL);
if(result != CURLE_OK) {
free(dir);
return result;
}
Curl_safefree(ftpc->entrypath);
ftpc->entrypath = dir; /* remember this */
infof(data, "Entry path is '%s'\n", ftpc->entrypath);
/* also save it where getinfo can access it: */
data->state.most_recent_ftp_entrypath = ftpc->entrypath;
state(conn, FTP_SYST);
break;
}
Curl_safefree(ftpc->entrypath);
ftpc->entrypath = dir; /* remember this */
infof(data, "Entry path is '%s'\n", ftpc->entrypath);
/* also save it where getinfo can access it: */
data->state.most_recent_ftp_entrypath = ftpc->entrypath;
}
else {
/* couldn't get the path */
free(dir);
infof(data, "Failed to figure out path\n");
}
}
state(conn, FTP_STOP); /* we are done with the CONNECT phase! */
DEBUGF(infof(data, "protocol connect phase DONE\n"));
break;
case FTP_SYST:
if(ftpcode == 215) {
char *ptr=&data->state.buffer[4]; /* start on the first letter */
char *os;
char *store;
os = malloc(nread + 1);
if(!os)
return CURLE_OUT_OF_MEMORY;
/* Reply format is like
215<space><OS-name><space><commentary>
*/
while(*ptr == ' ')
ptr++;
for(store = os; *ptr && *ptr != ' ';)
*store++ = *ptr++;
*store = '\0'; /* zero terminate */
/* Check for special servers here. */
if(strequal(os, "OS/400")) {
/* Force OS400 name format 1. */
result = Curl_pp_sendf(&ftpc->pp, "SITE NAMEFMT 1", NULL);
if(result != CURLE_OK) {
free(os);
return result;
}
/* remember target server OS */
Curl_safefree(ftpc->server_os);
ftpc->server_os = os;
state(conn, FTP_NAMEFMT);
break;
}
else {
/* Nothing special for the target server. */
/* remember target server OS */
Curl_safefree(ftpc->server_os);
ftpc->server_os = os;
}
}
else {
/* Cannot identify server OS. Continue anyway and cross fingers. */
}
state(conn, FTP_STOP); /* we are done with the CONNECT phase! */
DEBUGF(infof(data, "protocol connect phase DONE\n"));
break;
case FTP_NAMEFMT:
if(ftpcode == 250) {
/* Name format change successful: reload initial path. */
ftp_state_pwd(conn);
break;
}
state(conn, FTP_STOP); /* we are done with the CONNECT phase! */
DEBUGF(infof(data, "protocol connect phase DONE\n"));
break;
case FTP_QUOTE:
case FTP_POSTQUOTE:
case FTP_RETR_PREQUOTE:
case FTP_STOR_PREQUOTE:
if((ftpcode >= 400) && !ftpc->count2) {
/* failure response code, and not allowed to fail */
failf(conn->data, "QUOT command failed with %03d", ftpcode);
return CURLE_QUOTE_ERROR;
}
result = ftp_state_quote(conn, FALSE, ftpc->state);
if(result)
return result;
break;
case FTP_CWD:
if(ftpcode/100 != 2) {
/* failure to CWD there */
if(conn->data->set.ftp_create_missing_dirs &&
ftpc->count1 && !ftpc->count2) {
/* try making it */
ftpc->count2++; /* counter to prevent CWD-MKD loops */
PPSENDF(&ftpc->pp, "MKD %s", ftpc->dirs[ftpc->count1 - 1]);
state(conn, FTP_MKD);
}
else {
/* return failure */
failf(data, "Server denied you to change to the given directory");
ftpc->cwdfail = TRUE; /* don't remember this path as we failed
to enter it */
return CURLE_REMOTE_ACCESS_DENIED;
}
}
else {
/* success */
ftpc->count2=0;
if(++ftpc->count1 <= ftpc->dirdepth) {
/* send next CWD */
PPSENDF(&ftpc->pp, "CWD %s", ftpc->dirs[ftpc->count1 - 1]);
}
else {
result = ftp_state_post_cwd(conn);
if(result)
return result;
}
}
break;
case FTP_MKD:
if((ftpcode/100 != 2) && !ftpc->count3--) {
/* failure to MKD the dir */
failf(data, "Failed to MKD dir: %03d", ftpcode);
return CURLE_REMOTE_ACCESS_DENIED;
}
state(conn, FTP_CWD);
/* send CWD */
PPSENDF(&ftpc->pp, "CWD %s", ftpc->dirs[ftpc->count1 - 1]);
break;
case FTP_MDTM:
result = ftp_state_mdtm_resp(conn, ftpcode);
break;
case FTP_TYPE:
case FTP_LIST_TYPE:
case FTP_RETR_TYPE:
case FTP_STOR_TYPE:
result = ftp_state_type_resp(conn, ftpcode, ftpc->state);
break;
case FTP_SIZE:
case FTP_RETR_SIZE:
case FTP_STOR_SIZE:
result = ftp_state_size_resp(conn, ftpcode, ftpc->state);
break;
case FTP_REST:
case FTP_RETR_REST:
result = ftp_state_rest_resp(conn, ftpcode, ftpc->state);
break;
case FTP_PRET:
if(ftpcode != 200) {
/* there only is this one standard OK return code. */
failf(data, "PRET command not accepted: %03d", ftpcode);
return CURLE_FTP_PRET_FAILED;
}
result = ftp_state_use_pasv(conn);
break;
case FTP_PASV:
result = ftp_state_pasv_resp(conn, ftpcode);
break;
case FTP_PORT:
result = ftp_state_port_resp(conn, ftpcode);
break;
case FTP_LIST:
case FTP_RETR:
result = ftp_state_get_resp(conn, ftpcode, ftpc->state);
break;
case FTP_STOR:
result = ftp_state_stor_resp(conn, ftpcode, ftpc->state);
break;
case FTP_QUIT:
/* fallthrough, just stop! */
default:
/* internal error */
state(conn, FTP_STOP);
break;
}
} /* if(ftpcode) */
return result;
}
/* called repeatedly until done from multi.c */
static CURLcode ftp_multi_statemach(struct connectdata *conn,
bool *done)
{
struct ftp_conn *ftpc = &conn->proto.ftpc;
CURLcode result = Curl_pp_multi_statemach(&ftpc->pp);
/* Check for the state outside of the Curl_socket_ready() return code checks
since at times we are in fact already in this state when this function
gets called. */
*done = (ftpc->state == FTP_STOP) ? TRUE : FALSE;
return result;
}
static CURLcode ftp_easy_statemach(struct connectdata *conn)
{
struct ftp_conn *ftpc = &conn->proto.ftpc;
struct pingpong *pp = &ftpc->pp