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/* Copyright 2011 Justin Erenkrantz and Greg Stein
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*** Setup a SSL tunnel over a HTTP proxy, according to RFC 2817. ***/
#include <apr_pools.h>
#include <apr_strings.h>
#include "serf.h"
#include "serf_private.h"
/* Structure passed around as baton for the CONNECT request and respone. */
typedef struct {
apr_pool_t *pool;
const char *uri;
} req_ctx_t;
/* forward declaration. */
static apr_status_t setup_request(serf_request_t *request,
void *setup_baton,
serf_bucket_t **req_bkt,
serf_response_acceptor_t *acceptor,
void **acceptor_baton,
serf_response_handler_t *handler,
void **handler_baton,
apr_pool_t *pool);
static serf_bucket_t* accept_response(serf_request_t *request,
serf_bucket_t *stream,
void *acceptor_baton,
apr_pool_t *pool)
{
serf_bucket_t *c;
serf_bucket_alloc_t *bkt_alloc;
#if 0
req_ctx_t *ctx = acceptor_baton;
#endif
/* get the per-request bucket allocator */
bkt_alloc = serf_request_get_alloc(request);
/* Create a barrier so the response doesn't eat us! */
c = serf_bucket_barrier_create(stream, bkt_alloc);
return serf_bucket_response_create(c, bkt_alloc);
}
/* If a 200 OK was received for the CONNECT request, consider the connection
as ready for use. */
static apr_status_t handle_response(serf_request_t *request,
serf_bucket_t *response,
void *handler_baton,
apr_pool_t *pool)
{
apr_status_t status;
serf_status_line sl;
req_ctx_t *ctx = handler_baton;
if (! response) {
serf_connection_request_create(request->conn,
setup_request,
ctx);
return APR_SUCCESS;
}
status = serf_bucket_response_status(response, &sl);
if (SERF_BUCKET_READ_ERROR(status)) {
return status;
}
if (!sl.version && (APR_STATUS_IS_EOF(status) ||
APR_STATUS_IS_EAGAIN(status)))
{
return status;
}
status = serf_bucket_response_wait_for_headers(response);
if (status && !APR_STATUS_IS_EOF(status)) {
return status;
}
/* RFC 2817: Any successful (2xx) response to a CONNECT request indicates
that the proxy has established a connection to the requested host and
port, and has switched to tunneling the current connection to that server
connection.
*/
if (sl.code >= 200 && sl.code < 300) {
request->conn->state = SERF_CONN_CONNECTED;
/* Body is supposed to be empty. */
apr_pool_destroy(ctx->pool);
serf_bucket_destroy(request->conn->ssltunnel_ostream);
request->conn->stream = NULL;
ctx = NULL;
serf__log(CONN_VERBOSE, __FILE__,
"successfully set up ssl tunnel on connection 0x%x\n",
request->conn);
return APR_EOF;
}
/* Authentication failure and 2xx Ok are handled at this point,
the rest are errors. */
return SERF_ERROR_SSLTUNNEL_SETUP_FAILED;
}
/* Prepare the CONNECT request. */
static apr_status_t setup_request(serf_request_t *request,
void *setup_baton,
serf_bucket_t **req_bkt,
serf_response_acceptor_t *acceptor,
void **acceptor_baton,
serf_response_handler_t *handler,
void **handler_baton,
apr_pool_t *pool)
{
req_ctx_t *ctx = setup_baton;
*req_bkt =
serf_request_bucket_request_create(request,
"CONNECT", ctx->uri,
NULL,
serf_request_get_alloc(request));
*acceptor = accept_response;
*acceptor_baton = ctx;
*handler = handle_response;
*handler_baton = ctx;
return APR_SUCCESS;
}
static apr_status_t detect_eof(void *baton, serf_bucket_t *aggregate_bucket)
{
serf_connection_t *conn = baton;
conn->hit_eof = 1;
return APR_EAGAIN;
}
/* SSL tunnel is needed, push a CONNECT request on the connection. */
apr_status_t serf__ssltunnel_connect(serf_connection_t *conn)
{
req_ctx_t *ctx;
apr_pool_t *ssltunnel_pool;
apr_pool_create(&ssltunnel_pool, conn->pool);
ctx = apr_palloc(ssltunnel_pool, sizeof(*ctx));
ctx->pool = ssltunnel_pool;
ctx->uri = apr_psprintf(ctx->pool, "%s:%d", conn->host_info.hostinfo,
conn->host_info.port);
conn->ssltunnel_ostream = serf__bucket_stream_create(conn->allocator,
detect_eof,
conn);
/* TODO: should be the first request on the connection. */
serf_connection_priority_request_create(conn,
setup_request,
ctx);
conn->state = SERF_CONN_SETUP_SSLTUNNEL;
serf__log(CONN_VERBOSE, __FILE__,
"setting up ssl tunnel on connection 0x%x\n", conn);
return APR_SUCCESS;
}
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