606 lines
22 KiB
C
606 lines
22 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_PROXY) && !defined(CURL_DISABLE_HTTP)
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#include "urldata.h"
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#include <curl/curl.h>
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#include "http_proxy.h"
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#include "sendf.h"
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#include "http.h"
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#include "url.h"
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#include "select.h"
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#include "rawstr.h"
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#include "progress.h"
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#include "non-ascii.h"
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#include "connect.h"
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#include "curlx.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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CURLcode Curl_proxy_connect(struct connectdata *conn)
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{
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if(conn->bits.tunnel_proxy && conn->bits.httpproxy) {
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#ifndef CURL_DISABLE_PROXY
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/* for [protocol] tunneled through HTTP proxy */
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struct HTTP http_proxy;
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void *prot_save;
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const char *hostname;
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int remote_port;
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CURLcode result;
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/* BLOCKING */
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/* We want "seamless" operations through HTTP proxy tunnel */
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/* Curl_proxyCONNECT is based on a pointer to a struct HTTP at the
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* member conn->proto.http; we want [protocol] through HTTP and we have
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* to change the member temporarily for connecting to the HTTP
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* proxy. After Curl_proxyCONNECT we have to set back the member to the
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* original pointer
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*
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* This function might be called several times in the multi interface case
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* if the proxy's CONNTECT response is not instant.
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*/
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prot_save = conn->data->req.protop;
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memset(&http_proxy, 0, sizeof(http_proxy));
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conn->data->req.protop = &http_proxy;
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connkeep(conn, "HTTP proxy CONNECT");
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if(conn->bits.conn_to_host)
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hostname = conn->conn_to_host.name;
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else
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hostname = conn->host.name;
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if(conn->bits.conn_to_port)
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remote_port = conn->conn_to_port;
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else
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remote_port = conn->remote_port;
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result = Curl_proxyCONNECT(conn, FIRSTSOCKET, hostname,
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remote_port, FALSE);
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conn->data->req.protop = prot_save;
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if(CURLE_OK != result)
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return result;
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Curl_safefree(conn->allocptr.proxyuserpwd);
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#else
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return CURLE_NOT_BUILT_IN;
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#endif
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}
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/* no HTTP tunnel proxy, just return */
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return CURLE_OK;
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}
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/*
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* Curl_proxyCONNECT() requires that we're connected to a HTTP proxy. This
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* function will issue the necessary commands to get a seamless tunnel through
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* this proxy. After that, the socket can be used just as a normal socket.
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*
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* 'blocking' set to TRUE means that this function will do the entire CONNECT
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* + response in a blocking fashion. Should be avoided!
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*/
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CURLcode Curl_proxyCONNECT(struct connectdata *conn,
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int sockindex,
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const char *hostname,
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int remote_port,
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bool blocking)
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{
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int subversion=0;
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struct Curl_easy *data=conn->data;
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struct SingleRequest *k = &data->req;
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CURLcode result;
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curl_socket_t tunnelsocket = conn->sock[sockindex];
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curl_off_t cl=0;
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bool closeConnection = FALSE;
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bool chunked_encoding = FALSE;
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long check;
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#define SELECT_OK 0
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#define SELECT_ERROR 1
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#define SELECT_TIMEOUT 2
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int error = SELECT_OK;
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if(conn->tunnel_state[sockindex] == TUNNEL_COMPLETE)
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return CURLE_OK; /* CONNECT is already completed */
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conn->bits.proxy_connect_closed = FALSE;
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do {
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if(TUNNEL_INIT == conn->tunnel_state[sockindex]) {
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/* BEGIN CONNECT PHASE */
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char *host_port;
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Curl_send_buffer *req_buffer;
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infof(data, "Establish HTTP proxy tunnel to %s:%hu\n",
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hostname, remote_port);
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/* This only happens if we've looped here due to authentication
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reasons, and we don't really use the newly cloned URL here
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then. Just free() it. */
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free(data->req.newurl);
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data->req.newurl = NULL;
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/* initialize a dynamic send-buffer */
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req_buffer = Curl_add_buffer_init();
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if(!req_buffer)
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return CURLE_OUT_OF_MEMORY;
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host_port = aprintf("%s:%hu", hostname, remote_port);
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if(!host_port) {
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Curl_add_buffer_free(req_buffer);
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return CURLE_OUT_OF_MEMORY;
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}
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/* Setup the proxy-authorization header, if any */
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result = Curl_http_output_auth(conn, "CONNECT", host_port, TRUE);
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free(host_port);
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if(!result) {
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char *host=(char *)"";
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const char *useragent="";
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const char *http = (conn->proxytype == CURLPROXY_HTTP_1_0) ?
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"1.0" : "1.1";
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bool ipv6_ip = conn->bits.ipv6_ip;
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char *hostheader;
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/* the hostname may be different */
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if(hostname != conn->host.name)
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ipv6_ip = (strchr(hostname, ':') != NULL);
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hostheader= /* host:port with IPv6 support */
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aprintf("%s%s%s:%hu", ipv6_ip?"[":"", hostname, ipv6_ip?"]":"",
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remote_port);
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if(!hostheader) {
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Curl_add_buffer_free(req_buffer);
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return CURLE_OUT_OF_MEMORY;
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}
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if(!Curl_checkProxyheaders(conn, "Host:")) {
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host = aprintf("Host: %s\r\n", hostheader);
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if(!host) {
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free(hostheader);
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Curl_add_buffer_free(req_buffer);
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return CURLE_OUT_OF_MEMORY;
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}
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}
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if(!Curl_checkProxyheaders(conn, "User-Agent:") &&
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data->set.str[STRING_USERAGENT])
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useragent = conn->allocptr.uagent;
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result =
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Curl_add_bufferf(req_buffer,
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"CONNECT %s HTTP/%s\r\n"
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"%s" /* Host: */
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"%s" /* Proxy-Authorization */
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"%s", /* User-Agent */
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hostheader,
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http,
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host,
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conn->allocptr.proxyuserpwd?
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conn->allocptr.proxyuserpwd:"",
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useragent);
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if(host && *host)
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free(host);
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free(hostheader);
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if(!result)
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result = Curl_add_custom_headers(conn, TRUE, req_buffer);
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if(!result)
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/* CRLF terminate the request */
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result = Curl_add_bufferf(req_buffer, "\r\n");
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if(!result) {
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/* Send the connect request to the proxy */
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/* BLOCKING */
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result =
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Curl_add_buffer_send(req_buffer, conn,
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&data->info.request_size, 0, sockindex);
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}
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req_buffer = NULL;
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if(result)
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failf(data, "Failed sending CONNECT to proxy");
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}
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Curl_add_buffer_free(req_buffer);
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if(result)
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return result;
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conn->tunnel_state[sockindex] = TUNNEL_CONNECT;
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} /* END CONNECT PHASE */
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check = Curl_timeleft(data, NULL, TRUE);
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if(check <= 0) {
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failf(data, "Proxy CONNECT aborted due to timeout");
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return CURLE_RECV_ERROR;
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}
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if(!blocking) {
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if(0 == Curl_socket_ready(tunnelsocket, CURL_SOCKET_BAD, 0))
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/* return so we'll be called again polling-style */
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return CURLE_OK;
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else {
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DEBUGF(infof(data,
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"Read response immediately from proxy CONNECT\n"));
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}
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}
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/* at this point, the tunnel_connecting phase is over. */
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{ /* READING RESPONSE PHASE */
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size_t nread; /* total size read */
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int perline; /* count bytes per line */
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int keepon=TRUE;
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ssize_t gotbytes;
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char *ptr;
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char *line_start;
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ptr=data->state.buffer;
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line_start = ptr;
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nread=0;
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perline=0;
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while((nread<BUFSIZE) && (keepon && !error)) {
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check = Curl_timeleft(data, NULL, TRUE);
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if(check <= 0) {
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failf(data, "Proxy CONNECT aborted due to timeout");
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error = SELECT_TIMEOUT; /* already too little time */
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break;
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}
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/* loop every second at least, less if the timeout is near */
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switch (Curl_socket_ready(tunnelsocket, CURL_SOCKET_BAD,
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check<1000L?check:1000)) {
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case -1: /* select() error, stop reading */
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error = SELECT_ERROR;
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failf(data, "Proxy CONNECT aborted due to select/poll error");
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break;
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case 0: /* timeout */
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break;
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default:
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DEBUGASSERT(ptr+BUFSIZE-nread <= data->state.buffer+BUFSIZE+1);
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result = Curl_read(conn, tunnelsocket, ptr, BUFSIZE-nread,
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&gotbytes);
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if(result==CURLE_AGAIN)
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continue; /* go loop yourself */
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else if(result)
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keepon = FALSE;
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else if(gotbytes <= 0) {
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keepon = FALSE;
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if(data->set.proxyauth && data->state.authproxy.avail) {
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/* proxy auth was requested and there was proxy auth available,
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then deem this as "mere" proxy disconnect */
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conn->bits.proxy_connect_closed = TRUE;
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infof(data, "Proxy CONNECT connection closed\n");
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}
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else {
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error = SELECT_ERROR;
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failf(data, "Proxy CONNECT aborted");
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}
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}
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else {
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/*
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* We got a whole chunk of data, which can be anything from one
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* byte to a set of lines and possibly just a piece of the last
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* line.
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*/
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int i;
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nread += gotbytes;
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if(keepon > TRUE) {
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/* This means we are currently ignoring a response-body */
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nread = 0; /* make next read start over in the read buffer */
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ptr=data->state.buffer;
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if(cl) {
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/* A Content-Length based body: simply count down the counter
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and make sure to break out of the loop when we're done! */
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cl -= gotbytes;
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if(cl<=0) {
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keepon = FALSE;
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break;
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}
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}
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else {
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/* chunked-encoded body, so we need to do the chunked dance
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properly to know when the end of the body is reached */
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CHUNKcode r;
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ssize_t tookcareof=0;
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/* now parse the chunked piece of data so that we can
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properly tell when the stream ends */
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r = Curl_httpchunk_read(conn, ptr, gotbytes, &tookcareof);
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if(r == CHUNKE_STOP) {
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/* we're done reading chunks! */
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infof(data, "chunk reading DONE\n");
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keepon = FALSE;
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/* we did the full CONNECT treatment, go COMPLETE */
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conn->tunnel_state[sockindex] = TUNNEL_COMPLETE;
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}
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else
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infof(data, "Read %zd bytes of chunk, continue\n",
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tookcareof);
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}
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}
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else
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for(i = 0; i < gotbytes; ptr++, i++) {
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perline++; /* amount of bytes in this line so far */
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if(*ptr == 0x0a) {
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char letter;
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int writetype;
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/* convert from the network encoding */
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result = Curl_convert_from_network(data, line_start,
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perline);
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/* Curl_convert_from_network calls failf if unsuccessful */
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if(result)
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return result;
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/* output debug if that is requested */
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if(data->set.verbose)
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Curl_debug(data, CURLINFO_HEADER_IN,
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line_start, (size_t)perline, conn);
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/* send the header to the callback */
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writetype = CLIENTWRITE_HEADER;
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if(data->set.include_header)
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writetype |= CLIENTWRITE_BODY;
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result = Curl_client_write(conn, writetype, line_start,
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perline);
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data->info.header_size += (long)perline;
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data->req.headerbytecount += (long)perline;
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if(result)
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return result;
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/* Newlines are CRLF, so the CR is ignored as the line isn't
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really terminated until the LF comes. Treat a following CR
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as end-of-headers as well.*/
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if(('\r' == line_start[0]) ||
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('\n' == line_start[0])) {
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/* end of response-headers from the proxy */
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nread = 0; /* make next read start over in the read
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buffer */
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ptr=data->state.buffer;
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if((407 == k->httpcode) && !data->state.authproblem) {
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/* If we get a 407 response code with content length
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when we have no auth problem, we must ignore the
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whole response-body */
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keepon = 2;
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if(cl) {
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infof(data, "Ignore %" CURL_FORMAT_CURL_OFF_T
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" bytes of response-body\n", cl);
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/* remove the remaining chunk of what we already
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read */
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cl -= (gotbytes - i);
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if(cl<=0)
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/* if the whole thing was already read, we are done!
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*/
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keepon=FALSE;
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}
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else if(chunked_encoding) {
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CHUNKcode r;
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/* We set ignorebody true here since the chunked
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decoder function will acknowledge that. Pay
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attention so that this is cleared again when this
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function returns! */
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k->ignorebody = TRUE;
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infof(data, "%zd bytes of chunk left\n", gotbytes-i);
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if(line_start[1] == '\n') {
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/* this can only be a LF if the letter at index 0
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was a CR */
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line_start++;
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i++;
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}
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/* now parse the chunked piece of data so that we can
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properly tell when the stream ends */
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r = Curl_httpchunk_read(conn, line_start+1,
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gotbytes -i, &gotbytes);
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if(r == CHUNKE_STOP) {
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/* we're done reading chunks! */
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infof(data, "chunk reading DONE\n");
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keepon = FALSE;
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/* we did the full CONNECT treatment, go to
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COMPLETE */
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conn->tunnel_state[sockindex] = TUNNEL_COMPLETE;
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}
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else
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infof(data, "Read %zd bytes of chunk, continue\n",
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gotbytes);
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}
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else {
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/* without content-length or chunked encoding, we
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can't keep the connection alive since the close is
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the end signal so we bail out at once instead */
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keepon=FALSE;
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}
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}
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else {
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keepon = FALSE;
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if(200 == data->info.httpproxycode) {
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if(gotbytes - (i+1))
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failf(data, "Proxy CONNECT followed by %zd bytes "
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"of opaque data. Data ignored (known bug #39)",
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gotbytes - (i+1));
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}
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}
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/* we did the full CONNECT treatment, go to COMPLETE */
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conn->tunnel_state[sockindex] = TUNNEL_COMPLETE;
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break; /* breaks out of for-loop, not switch() */
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}
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/* keep a backup of the position we are about to blank */
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letter = line_start[perline];
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line_start[perline]=0; /* zero terminate the buffer */
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if((checkprefix("WWW-Authenticate:", line_start) &&
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(401 == k->httpcode)) ||
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(checkprefix("Proxy-authenticate:", line_start) &&
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(407 == k->httpcode))) {
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bool proxy = (k->httpcode == 407) ? TRUE : FALSE;
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char *auth = Curl_copy_header_value(line_start);
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if(!auth)
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return CURLE_OUT_OF_MEMORY;
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result = Curl_http_input_auth(conn, proxy, auth);
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free(auth);
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if(result)
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return result;
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}
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else if(checkprefix("Content-Length:", line_start)) {
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cl = curlx_strtoofft(line_start +
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strlen("Content-Length:"), NULL, 10);
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}
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else if(Curl_compareheader(line_start,
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"Connection:", "close"))
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closeConnection = TRUE;
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else if(Curl_compareheader(line_start,
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"Transfer-Encoding:",
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"chunked")) {
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infof(data, "CONNECT responded chunked\n");
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chunked_encoding = TRUE;
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/* init our chunky engine */
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Curl_httpchunk_init(conn);
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}
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else if(Curl_compareheader(line_start,
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"Proxy-Connection:", "close"))
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closeConnection = TRUE;
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else if(2 == sscanf(line_start, "HTTP/1.%d %d",
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&subversion,
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&k->httpcode)) {
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/* store the HTTP code from the proxy */
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data->info.httpproxycode = k->httpcode;
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}
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/* put back the letter we blanked out before */
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line_start[perline]= letter;
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perline=0; /* line starts over here */
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line_start = ptr+1; /* this skips the zero byte we wrote */
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}
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}
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}
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break;
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} /* switch */
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if(Curl_pgrsUpdate(conn))
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return CURLE_ABORTED_BY_CALLBACK;
|
|
} /* while there's buffer left and loop is requested */
|
|
|
|
if(error)
|
|
return CURLE_RECV_ERROR;
|
|
|
|
if(data->info.httpproxycode != 200) {
|
|
/* Deal with the possibly already received authenticate
|
|
headers. 'newurl' is set to a new URL if we must loop. */
|
|
result = Curl_http_auth_act(conn);
|
|
if(result)
|
|
return result;
|
|
|
|
if(conn->bits.close)
|
|
/* the connection has been marked for closure, most likely in the
|
|
Curl_http_auth_act() function and thus we can kill it at once
|
|
below
|
|
*/
|
|
closeConnection = TRUE;
|
|
}
|
|
|
|
if(closeConnection && data->req.newurl) {
|
|
/* Connection closed by server. Don't use it anymore */
|
|
Curl_closesocket(conn, conn->sock[sockindex]);
|
|
conn->sock[sockindex] = CURL_SOCKET_BAD;
|
|
break;
|
|
}
|
|
} /* END READING RESPONSE PHASE */
|
|
|
|
/* If we are supposed to continue and request a new URL, which basically
|
|
* means the HTTP authentication is still going on so if the tunnel
|
|
* is complete we start over in INIT state */
|
|
if(data->req.newurl &&
|
|
(TUNNEL_COMPLETE == conn->tunnel_state[sockindex])) {
|
|
conn->tunnel_state[sockindex] = TUNNEL_INIT;
|
|
infof(data, "TUNNEL_STATE switched to: %d\n",
|
|
conn->tunnel_state[sockindex]);
|
|
}
|
|
|
|
} while(data->req.newurl);
|
|
|
|
if(200 != data->req.httpcode) {
|
|
if(closeConnection && data->req.newurl) {
|
|
conn->bits.proxy_connect_closed = TRUE;
|
|
infof(data, "Connect me again please\n");
|
|
}
|
|
else {
|
|
free(data->req.newurl);
|
|
data->req.newurl = NULL;
|
|
/* failure, close this connection to avoid re-use */
|
|
connclose(conn, "proxy CONNECT failure");
|
|
Curl_closesocket(conn, conn->sock[sockindex]);
|
|
conn->sock[sockindex] = CURL_SOCKET_BAD;
|
|
}
|
|
|
|
/* to back to init state */
|
|
conn->tunnel_state[sockindex] = TUNNEL_INIT;
|
|
|
|
if(conn->bits.proxy_connect_closed)
|
|
/* this is not an error, just part of the connection negotiation */
|
|
return CURLE_OK;
|
|
else {
|
|
failf(data, "Received HTTP code %d from proxy after CONNECT",
|
|
data->req.httpcode);
|
|
return CURLE_RECV_ERROR;
|
|
}
|
|
}
|
|
|
|
conn->tunnel_state[sockindex] = TUNNEL_COMPLETE;
|
|
|
|
/* If a proxy-authorization header was used for the proxy, then we should
|
|
make sure that it isn't accidentally used for the document request
|
|
after we've connected. So let's free and clear it here. */
|
|
Curl_safefree(conn->allocptr.proxyuserpwd);
|
|
conn->allocptr.proxyuserpwd = NULL;
|
|
|
|
data->state.authproxy.done = TRUE;
|
|
|
|
infof (data, "Proxy replied OK to CONNECT request\n");
|
|
data->req.ignorebody = FALSE; /* put it (back) to non-ignore state */
|
|
conn->bits.rewindaftersend = FALSE; /* make sure this isn't set for the
|
|
document request */
|
|
return CURLE_OK;
|
|
}
|
|
#endif /* CURL_DISABLE_PROXY */
|