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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/ext/filters/client_channel/http_proxy.h"
#include <stdbool.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/client_channel/http_connect_handshaker.h"
#include "src/core/ext/filters/client_channel/proxy_mapper_registry.h"
#include "src/core/ext/filters/client_channel/uri_parser.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/support/env.h"
static char* grpc_get_http_proxy_server(grpc_exec_ctx* exec_ctx) {
char* uri_str = gpr_getenv("http_proxy");
if (uri_str == NULL) return NULL;
grpc_uri* uri =
grpc_uri_parse(exec_ctx, uri_str, false /* suppress_errors */);
char* proxy_name = NULL;
if (uri == NULL || uri->authority == NULL) {
gpr_log(GPR_ERROR, "cannot parse value of 'http_proxy' env var");
goto done;
}
if (strcmp(uri->scheme, "http") != 0) {
gpr_log(GPR_ERROR, "'%s' scheme not supported in proxy URI", uri->scheme);
goto done;
}
if (strchr(uri->authority, '@') != NULL) {
gpr_log(GPR_ERROR, "userinfo not supported in proxy URI");
goto done;
}
proxy_name = gpr_strdup(uri->authority);
done:
gpr_free(uri_str);
grpc_uri_destroy(uri);
return proxy_name;
}
static bool proxy_mapper_map_name(grpc_exec_ctx* exec_ctx,
grpc_proxy_mapper* mapper,
const char* server_uri,
const grpc_channel_args* args,
char** name_to_resolve,
grpc_channel_args** new_args) {
*name_to_resolve = grpc_get_http_proxy_server(exec_ctx);
if (*name_to_resolve == NULL) return false;
grpc_uri* uri =
grpc_uri_parse(exec_ctx, server_uri, false /* suppress_errors */);
if (uri == NULL || uri->path[0] == '\0') {
gpr_log(GPR_ERROR,
"'http_proxy' environment variable set, but cannot "
"parse server URI '%s' -- not using proxy",
server_uri);
if (uri != NULL) grpc_uri_destroy(uri);
return false;
}
if (strcmp(uri->scheme, "unix") == 0) {
gpr_log(GPR_INFO, "not using proxy for Unix domain socket '%s'",
server_uri);
grpc_uri_destroy(uri);
return false;
}
grpc_arg new_arg;
new_arg.key = GRPC_ARG_HTTP_CONNECT_SERVER;
new_arg.type = GRPC_ARG_STRING;
new_arg.value.string = uri->path[0] == '/' ? uri->path + 1 : uri->path;
*new_args = grpc_channel_args_copy_and_add(args, &new_arg, 1);
grpc_uri_destroy(uri);
return true;
}
static bool proxy_mapper_map_address(grpc_exec_ctx* exec_ctx,
grpc_proxy_mapper* mapper,
const grpc_resolved_address* address,
const grpc_channel_args* args,
grpc_resolved_address** new_address,
grpc_channel_args** new_args) {
return false;
}
static void proxy_mapper_destroy(grpc_proxy_mapper* mapper) {}
static const grpc_proxy_mapper_vtable proxy_mapper_vtable = {
proxy_mapper_map_name, proxy_mapper_map_address, proxy_mapper_destroy};
static grpc_proxy_mapper proxy_mapper = {&proxy_mapper_vtable};
void grpc_register_http_proxy_mapper() {
grpc_proxy_mapper_register(true /* at_start */, &proxy_mapper);
}
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