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mod_websocket.c
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/*
* Copyright 2010-2012 self.disconnect
*
* 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.
*/
/* _ _ _ _
* _ __ ___ ___ __| | __ __ _ | |__ ___ ___ ___ | | __ _ _| |_ mod_websocket
* | '_ ` _ \ / _ \ / _` | \ \ /\ / / _ \ '_ \/ __// _ \ / __\| |/ / _ \_ _| Apache Interface to WebSocket
* | | | | | | (_) | (_| | \ V V / __/ |_) )__ \ (_) | (___| ( __/| |__
* |_| |_| |_|\___/ \__,_|___\_/\_/ \___|_,__/|___/\___/ \___/|_|\_\___| \__/
* |_____|
* mod_websocket.c
* Apache API inteface structures
*/
#include "apr_base64.h"
#include "apr_sha1.h"
#include "apr_strings.h"
#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "websocket_plugin.h"
#include "validate_utf8.h"
#define CORE_PRIVATE
#include "http_core.h"
#include "http_connection.h"
#if !defined(APR_ARRAY_IDX)
#define APR_ARRAY_IDX(ary,i,type) (((type *)(ary)->elts)[i])
#endif
#if !defined(APR_ARRAY_PUSH)
#define APR_ARRAY_PUSH(ary,type) (*((type *)apr_array_push(ary)))
#endif
module AP_MODULE_DECLARE_DATA websocket_module;
typedef struct
{
char *location;
apr_dso_handle_t *res_handle;
WebSocketPlugin *plugin;
apr_int64_t payload_limit;
} websocket_config_rec;
#define BLOCK_DATA_SIZE 4096
#define DATA_FRAMING_MASK 0
#define DATA_FRAMING_START 1
#define DATA_FRAMING_PAYLOAD_LENGTH 2
#define DATA_FRAMING_PAYLOAD_LENGTH_EXT 3
#define DATA_FRAMING_EXTENSION_DATA 4
#define DATA_FRAMING_APPLICATION_DATA 5
#define DATA_FRAMING_CLOSE 6
#define FRAME_GET_FIN(BYTE) (((BYTE) >> 7) & 0x01)
#define FRAME_GET_RSV1(BYTE) (((BYTE) >> 6) & 0x01)
#define FRAME_GET_RSV2(BYTE) (((BYTE) >> 5) & 0x01)
#define FRAME_GET_RSV3(BYTE) (((BYTE) >> 4) & 0x01)
#define FRAME_GET_OPCODE(BYTE) ( (BYTE) & 0x0F)
#define FRAME_GET_MASK(BYTE) (((BYTE) >> 7) & 0x01)
#define FRAME_GET_PAYLOAD_LEN(BYTE) ( (BYTE) & 0x7F)
#define FRAME_SET_FIN(BYTE) (((BYTE) & 0x01) << 7)
#define FRAME_SET_OPCODE(BYTE) ((BYTE) & 0x0F)
#define FRAME_SET_MASK(BYTE) (((BYTE) & 0x01) << 7)
#define FRAME_SET_LENGTH(X64, IDX) (unsigned char)(((X64) >> ((IDX)*8)) & 0xFF)
#define OPCODE_CONTINUATION 0x0
#define OPCODE_TEXT 0x1
#define OPCODE_BINARY 0x2
#define OPCODE_CLOSE 0x8
#define OPCODE_PING 0x9
#define OPCODE_PONG 0xA
#define WEBSOCKET_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
#define WEBSOCKET_GUID_LEN 36
#define STATUS_CODE_OK 1000
#define STATUS_CODE_GOING_AWAY 1001
#define STATUS_CODE_PROTOCOL_ERROR 1002
#define STATUS_CODE_RESERVED 1004 /* Protocol 8: frame too large */
#define STATUS_CODE_INVALID_UTF8 1007
#define STATUS_CODE_POLICY_VIOLATION 1008
#define STATUS_CODE_MESSAGE_TOO_LARGE 1009
#define STATUS_CODE_INTERNAL_ERROR 1011
/*
* Configuration
*/
static void *mod_websocket_create_dir_config(apr_pool_t *p, char *path)
{
websocket_config_rec *conf = NULL;
if (path != NULL) {
conf = apr_pcalloc(p, sizeof(websocket_config_rec));
if (conf != NULL) {
conf->location = apr_pstrdup(p, path);
conf->payload_limit = 32 * 1024 * 1024;
}
}
return (void *)conf;
}
static apr_status_t mod_websocket_cleanup_config(void *data)
{
if (data != NULL) {
websocket_config_rec *conf = (websocket_config_rec *)data;
if (conf != NULL) {
if ((conf->plugin != NULL) && (conf->plugin->destroy != NULL)) {
conf->plugin->destroy(conf->plugin);
}
conf->plugin = NULL;
if (conf->res_handle != NULL) {
apr_dso_unload(conf->res_handle);
conf->res_handle = NULL;
}
}
}
return APR_SUCCESS;
}
static const char *mod_websocket_conf_handler(cmd_parms *cmd, void *confv,
const char *path,
const char *name)
{
websocket_config_rec *conf = (websocket_config_rec *)confv;
char *response;
if ((conf != NULL) && (path != NULL) && (name != NULL)) {
apr_dso_handle_t *res_handle = NULL;
apr_dso_handle_sym_t sym;
if (apr_dso_load
(&res_handle, ap_server_root_relative(cmd->pool, path),
cmd->pool) == APR_SUCCESS) {
if ((apr_dso_sym(&sym, res_handle, name) == APR_SUCCESS) &&
(sym != NULL)) {
WebSocketPlugin *plugin = ((WS_Init) sym) ();
if ((plugin != NULL) &&
(plugin->version == WEBSOCKET_PLUGIN_VERSION_0) &&
(plugin->size >= sizeof(WebSocketPlugin)) &&
(plugin->on_message != NULL)) { /* Require an on_message handler */
conf->res_handle = res_handle;
conf->plugin = plugin;
apr_pool_cleanup_register(cmd->pool, conf,
mod_websocket_cleanup_config,
apr_pool_cleanup_null);
response = NULL;
}
else {
apr_dso_unload(res_handle);
response = "Invalid response from initialization function";
}
}
else {
apr_dso_unload(res_handle);
response = "Could not find initialization function in module";
}
}
else {
response = "Could not open WebSocket handler module";
}
}
else {
response = "Invalid parameters";
}
return response;
}
static const char *mod_websocket_conf_max_message_size(cmd_parms *cmd,
void *confv,
const char *size)
{
websocket_config_rec *conf = (websocket_config_rec *)confv;
char *response;
if ((conf != NULL) && (size != NULL)) {
apr_int64_t payload_limit = apr_atoi64(size);
if (payload_limit > 0) {
conf->payload_limit = payload_limit;
response = NULL;
}
else {
response = "Invalid maximum message size";
}
}
else {
response = "Invalid parameter";
}
return response;
}
/*
* Functions available to plugins.
*/
typedef struct _WebSocketState
{
request_rec *r;
apr_bucket_brigade *obb;
apr_thread_mutex_t *mutex;
apr_array_header_t *protocols;
int closing;
apr_int64_t protocol_version;
} WebSocketState;
static request_rec *CALLBACK mod_websocket_request(const WebSocketServer *server)
{
if ((server != NULL) && (server->state != NULL)) {
return server->state->r;
}
return NULL;
}
static const char *CALLBACK mod_websocket_header_get(const WebSocketServer *server,
const char *key)
{
if ((server != NULL) && (key != NULL)) {
WebSocketState *state = server->state;
if ((state != NULL) && (state->r != NULL)) {
return apr_table_get(state->r->headers_in, key);
}
}
return NULL;
}
static void CALLBACK mod_websocket_header_set(const WebSocketServer *server,
const char *key,
const char *value)
{
if ((server != NULL) && (key != NULL) && (value != NULL)) {
WebSocketState *state = server->state;
if ((state != NULL) && (state->r != NULL)) {
apr_table_setn(state->r->headers_out,
apr_pstrdup(state->r->pool, key),
apr_pstrdup(state->r->pool, value));
}
}
}
static size_t CALLBACK mod_websocket_protocol_count(const WebSocketServer *server)
{
size_t count = 0;
if ((server != NULL) && (server->state != NULL) &&
(server->state->protocols != NULL) &&
!apr_is_empty_array(server->state->protocols)) {
count = (size_t) server->state->protocols->nelts;
}
return count;
}
static const char *CALLBACK mod_websocket_protocol_index(const WebSocketServer *server,
const size_t index)
{
if ((index >= 0) && (index < mod_websocket_protocol_count(server))) {
return APR_ARRAY_IDX(server->state->protocols, index, char *);
}
return NULL;
}
static void CALLBACK mod_websocket_protocol_set(const WebSocketServer *server,
const char *protocol)
{
if ((server != NULL) && (protocol != NULL)) {
WebSocketState *state = server->state;
if ((state != NULL) && (state->r != NULL)) {
apr_table_setn(state->r->headers_out, "Sec-WebSocket-Protocol",
apr_pstrdup(state->r->pool, protocol));
}
}
}
static size_t CALLBACK mod_websocket_plugin_send(const WebSocketServer *server,
const int type,
const unsigned char *buffer,
const size_t buffer_size)
{
apr_uint64_t payload_length =
(apr_uint64_t) ((buffer != NULL) ? buffer_size : 0);
size_t written = 0;
/* Deal with size more that 63 bits - FIXME */
if ((server != NULL) && (server->state != NULL)) {
WebSocketState *state = server->state;
apr_thread_mutex_lock(state->mutex);
if ((state->r != NULL) && (state->obb != NULL) && !state->closing) {
unsigned char header[32];
ap_filter_t *of = state->r->connection->output_filters;
apr_size_t pos = 0;
unsigned char opcode;
switch (type) {
case MESSAGE_TYPE_TEXT:
opcode = OPCODE_TEXT;
break;
case MESSAGE_TYPE_BINARY:
opcode = OPCODE_BINARY;
break;
case MESSAGE_TYPE_PING:
opcode = OPCODE_PING;
break;
case MESSAGE_TYPE_PONG:
opcode = OPCODE_PONG;
break;
case MESSAGE_TYPE_CLOSE:
default:
state->closing = 1;
opcode = OPCODE_CLOSE;
break;
}
header[pos++] = FRAME_SET_FIN(1) | FRAME_SET_OPCODE(opcode);
if (payload_length < 126) {
header[pos++] =
FRAME_SET_MASK(0) | FRAME_SET_LENGTH(payload_length, 0);
}
else {
if (payload_length < 65536) {
header[pos++] = FRAME_SET_MASK(0) | 126;
}
else {
header[pos++] = FRAME_SET_MASK(0) | 127;
header[pos++] = FRAME_SET_LENGTH(payload_length, 7);
header[pos++] = FRAME_SET_LENGTH(payload_length, 6);
header[pos++] = FRAME_SET_LENGTH(payload_length, 5);
header[pos++] = FRAME_SET_LENGTH(payload_length, 4);
header[pos++] = FRAME_SET_LENGTH(payload_length, 3);
header[pos++] = FRAME_SET_LENGTH(payload_length, 2);
}
header[pos++] = FRAME_SET_LENGTH(payload_length, 1);
header[pos++] = FRAME_SET_LENGTH(payload_length, 0);
}
ap_fwrite(of, state->obb, (const char *)header, pos); /* Header */
if (payload_length > 0) {
if (ap_fwrite(of, state->obb,
(const char *)buffer,
buffer_size) == APR_SUCCESS) { /* Payload Data */
written = buffer_size;
}
}
if (ap_fflush(of, state->obb) != APR_SUCCESS) {
written = 0;
}
}
apr_thread_mutex_unlock(state->mutex);
}
return written;
}
static void CALLBACK mod_websocket_plugin_close(const WebSocketServer *
server)
{
if (server != NULL) {
/* Send closing handshake */
mod_websocket_plugin_send(server, MESSAGE_TYPE_CLOSE, NULL, 0);
}
}
/*
* Read a buffer of data from the input stream.
*/
static apr_size_t mod_websocket_read_block(request_rec *r, char *buffer,
apr_size_t bufsiz)
{
apr_status_t rv;
apr_bucket_brigade *bb;
apr_size_t readbufsiz = 0;
bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
if (bb != NULL) {
if ((rv =
ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
APR_BLOCK_READ, bufsiz)) == APR_SUCCESS) {
if ((rv =
apr_brigade_flatten(bb, buffer, &bufsiz)) == APR_SUCCESS) {
readbufsiz = bufsiz;
}
}
apr_brigade_destroy(bb);
}
return readbufsiz;
}
/*
* Base64-encode the SHA-1 hash of the client-supplied key with the WebSocket
* GUID appended to it.
*/
static void mod_websocket_handshake(const WebSocketServer *server,
const char *key)
{
WebSocketState *state = server->state;
apr_byte_t response[32];
apr_byte_t digest[APR_SHA1_DIGESTSIZE];
apr_sha1_ctx_t context;
int len;
apr_sha1_init(&context);
apr_sha1_update(&context, key, strlen(key));
apr_sha1_update(&context, WEBSOCKET_GUID, WEBSOCKET_GUID_LEN);
apr_sha1_final(digest, &context);
len = apr_base64_encode_binary((char *)response, digest, sizeof(digest));
response[len] = '\0';
apr_table_setn(state->r->headers_out, "Sec-WebSocket-Accept",
apr_pstrdup(state->r->pool, (const char *)response));
}
/*
* The client-supplied WebSocket protocol entry consists of a list of
* client-side supported protocols. Parse the list, and create an array
* containing those protocol names.
*/
static void mod_websocket_parse_protocol(const WebSocketServer *server,
const char *sec_websocket_protocol)
{
WebSocketState *state = server->state;
apr_array_header_t *protocols =
apr_array_make(state->r->pool, 1, sizeof(char *));
char *protocol_state = NULL;
char *protocol =
apr_strtok(apr_pstrdup(state->r->pool, sec_websocket_protocol),
", \t", &protocol_state);
while (protocol != NULL) {
APR_ARRAY_PUSH(protocols, char *) = protocol;
protocol = apr_strtok(NULL, ", \t", &protocol_state);
}
if (!apr_is_empty_array(protocols)) {
state->protocols = protocols;
}
}
typedef struct _WebSocketFrameData
{
apr_uint64_t application_data_offset;
unsigned char *application_data;
unsigned char fin;
unsigned char opcode;
unsigned int utf8_state;
} WebSocketFrameData;
/*
* The data framing handler requires that the server state mutex is locked by
* the caller upon entering this function. It will be locked when leaving too.
*/
static void mod_websocket_data_framing(const WebSocketServer *server,
websocket_config_rec *conf,
void *plugin_private)
{
WebSocketState *state = server->state;
request_rec *r = state->r;
apr_bucket_brigade *obb =
apr_brigade_create(r->pool, r->connection->bucket_alloc);
if (obb != NULL) {
unsigned char block[BLOCK_DATA_SIZE];
apr_int64_t block_size;
apr_int64_t extension_bytes_remaining = 0;
apr_int64_t payload_length = 0;
apr_int64_t mask_offset = 0;
int framing_state = DATA_FRAMING_START;
int payload_length_bytes_remaining = 0;
int mask_index = 0, masking = 0;
unsigned char mask[4] = { 0, 0, 0, 0 };
unsigned char fin = 0, opcode = 0xFF;
WebSocketFrameData control_frame = { 0, NULL, 1, 8, UTF8_VALID };
WebSocketFrameData message_frame = { 0, NULL, 1, 0, UTF8_VALID };
WebSocketFrameData *frame = &control_frame;
unsigned short status_code = STATUS_CODE_OK;
unsigned char status_code_buffer[2];
/* Allow the plugin to now write to the client */
state->obb = obb;
apr_thread_mutex_unlock(state->mutex);
while ((framing_state != DATA_FRAMING_CLOSE) &&
((block_size =
mod_websocket_read_block(r, (char *)block,
sizeof(block))) > 0)) {
apr_int64_t block_offset = 0;
while (block_offset < block_size) {
switch (framing_state) {
case DATA_FRAMING_START:
/*
* Since we don't currently support any extensions,
* the reserve bits must be 0
*/
if ((FRAME_GET_RSV1(block[block_offset]) != 0) ||
(FRAME_GET_RSV2(block[block_offset]) != 0) ||
(FRAME_GET_RSV3(block[block_offset]) != 0)) {
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_PROTOCOL_ERROR;
break;
}
fin = FRAME_GET_FIN(block[block_offset]);
opcode = FRAME_GET_OPCODE(block[block_offset++]);
framing_state = DATA_FRAMING_PAYLOAD_LENGTH;
if (opcode >= 0x8) { /* Control frame */
if (fin) {
frame = &control_frame;
frame->opcode = opcode;
frame->utf8_state = UTF8_VALID;
}
else {
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_PROTOCOL_ERROR;
break;
}
}
else { /* Message frame */
frame = &message_frame;
if (opcode) {
if (frame->fin) {
frame->opcode = opcode;
frame->utf8_state = UTF8_VALID;
}
else {
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_PROTOCOL_ERROR;
break;
}
}
else if (frame->fin ||
((opcode = frame->opcode) == 0)) {
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_PROTOCOL_ERROR;
break;
}
frame->fin = fin;
}
payload_length = 0;
payload_length_bytes_remaining = 0;
if (block_offset >= block_size) {
break; /* Only break if we need more data */
}
case DATA_FRAMING_PAYLOAD_LENGTH:
payload_length = (apr_int64_t)
FRAME_GET_PAYLOAD_LEN(block[block_offset]);
masking = FRAME_GET_MASK(block[block_offset++]);
if (payload_length == 126) {
payload_length = 0;
payload_length_bytes_remaining = 2;
}
else if (payload_length == 127) {
payload_length = 0;
payload_length_bytes_remaining = 8;
}
else {
payload_length_bytes_remaining = 0;
}
if ((masking == 0) || /* Client-side mask is required */
((opcode >= 0x8) && /* Control opcodes cannot have a payload larger than 125 bytes */
(payload_length_bytes_remaining != 0))) {
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_PROTOCOL_ERROR;
break;
}
else {
framing_state = DATA_FRAMING_PAYLOAD_LENGTH_EXT;
}
if (block_offset >= block_size) {
break; /* Only break if we need more data */
}
case DATA_FRAMING_PAYLOAD_LENGTH_EXT:
while ((payload_length_bytes_remaining > 0) &&
(block_offset < block_size)) {
payload_length *= 256;
payload_length += block[block_offset++];
payload_length_bytes_remaining--;
}
if (payload_length_bytes_remaining == 0) {
if ((payload_length < 0) ||
(payload_length > conf->payload_limit)) {
/* Invalid payload length */
framing_state = DATA_FRAMING_CLOSE;
status_code = (state->protocol_version >= 13) ?
STATUS_CODE_MESSAGE_TOO_LARGE :
STATUS_CODE_RESERVED;
break;
}
else if (masking != 0) {
framing_state = DATA_FRAMING_MASK;
}
else {
framing_state = DATA_FRAMING_EXTENSION_DATA;
break;
}
}
if (block_offset >= block_size) {
break; /* Only break if we need more data */
}
case DATA_FRAMING_MASK:
while ((mask_index < 4) && (block_offset < block_size)) {
mask[mask_index++] = block[block_offset++];
}
if (mask_index == 4) {
framing_state = DATA_FRAMING_EXTENSION_DATA;
mask_offset = 0;
mask_index = 0;
if ((mask[0] == 0) && (mask[1] == 0) &&
(mask[2] == 0) && (mask[3] == 0)) {
masking = 0;
}
}
else {
break;
}
/* Fall through */
case DATA_FRAMING_EXTENSION_DATA:
/* Deal with extension data when we support them -- FIXME */
if (extension_bytes_remaining == 0) {
if (payload_length > 0) {
frame->application_data = (unsigned char *)
realloc(frame->application_data,
frame->application_data_offset +
payload_length);
if (frame->application_data == NULL) {
framing_state = DATA_FRAMING_CLOSE;
status_code = (state->protocol_version >= 13) ?
STATUS_CODE_INTERNAL_ERROR :
STATUS_CODE_GOING_AWAY;
break;
}
}
framing_state = DATA_FRAMING_APPLICATION_DATA;
}
/* Fall through */
case DATA_FRAMING_APPLICATION_DATA:
{
apr_int64_t block_data_length;
apr_int64_t block_length = 0;
apr_uint64_t application_data_offset =
frame->application_data_offset;
unsigned char *application_data =
frame->application_data;
block_length = block_size - block_offset;
block_data_length =
(payload_length >
block_length) ? block_length : payload_length;
if (masking) {
apr_int64_t i;
if (opcode == OPCODE_TEXT) {
unsigned int utf8_state = frame->utf8_state;
unsigned char c;
for (i = 0; i < block_data_length; i++) {
c = block[block_offset++] ^
mask[mask_offset++ & 3];
utf8_state =
validate_utf8[utf8_state + c];
if (utf8_state == UTF8_INVALID) {
payload_length = block_data_length;
break;
}
application_data
[application_data_offset++] = c;
}
frame->utf8_state = utf8_state;
}
else {
/* Need to optimize the unmasking -- FIXME */
for (i = 0; i < block_data_length; i++) {
application_data
[application_data_offset++] =
block[block_offset++] ^
mask[mask_offset++ & 3];
}
}
}
else if (block_data_length > 0) {
memcpy(&application_data[application_data_offset],
&block[block_offset], block_data_length);
if (opcode == OPCODE_TEXT) {
apr_int64_t i, application_data_end =
application_data_offset +
block_data_length;
unsigned int utf8_state = frame->utf8_state;
for (i = application_data_offset;
i < application_data_end; i++) {
utf8_state =
validate_utf8[utf8_state +
application_data[i]];
if (utf8_state == UTF8_INVALID) {
payload_length = block_data_length;
break;
}
}
frame->utf8_state = utf8_state;
}
application_data_offset += block_data_length;
block_offset += block_data_length;
}
payload_length -= block_data_length;
if (payload_length == 0) {
int message_type = MESSAGE_TYPE_INVALID;
switch (opcode) {
case OPCODE_TEXT:
if ((fin &&
(frame->utf8_state != UTF8_VALID)) ||
(frame->utf8_state == UTF8_INVALID)) {
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_INVALID_UTF8;
}
else {
message_type = MESSAGE_TYPE_TEXT;
}
break;
case OPCODE_BINARY:
message_type = MESSAGE_TYPE_BINARY;
break;
case OPCODE_CLOSE:
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_OK;
break;
case OPCODE_PING:
mod_websocket_plugin_send(server,
MESSAGE_TYPE_PONG,
application_data,
application_data_offset);
break;
case OPCODE_PONG:
break;
default:
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_PROTOCOL_ERROR;
break;
}
if (fin && (message_type != MESSAGE_TYPE_INVALID)) {
conf->plugin->on_message(plugin_private,
server, message_type,
application_data,
application_data_offset);
}
if (framing_state != DATA_FRAMING_CLOSE) {
framing_state = DATA_FRAMING_START;
if (fin) {
if (frame->application_data != NULL) {
free(frame->application_data);
frame->application_data = NULL;
}
application_data_offset = 0;
}
}
}
frame->application_data_offset =
application_data_offset;
}
break;
case DATA_FRAMING_CLOSE:
block_offset = block_size;
break;
default:
framing_state = DATA_FRAMING_CLOSE;
status_code = STATUS_CODE_PROTOCOL_ERROR;
break;
}
}
}
if (message_frame.application_data != NULL) {
free(message_frame.application_data);
}
if (control_frame.application_data != NULL) {
free(control_frame.application_data);
}
/* Send server-side closing handshake */
status_code_buffer[0] = (status_code >> 8) & 0xFF;
status_code_buffer[1] = status_code & 0xFF;
mod_websocket_plugin_send(server, MESSAGE_TYPE_CLOSE,
status_code_buffer,
sizeof(status_code_buffer));
/* We are done with the bucket brigade */
apr_thread_mutex_lock(state->mutex);
state->obb = NULL;
apr_brigade_destroy(obb);
}
}
/*
* This is the WebSocket request handler. Since WebSocket headers are quite
* similar to HTTP headers, we will use most of the HTTP protocol handling
* code. The difference is that we will disable the HTTP content body handling,
* and then process the body according to the WebSocket specification.
*/
static int mod_websocket_method_handler(request_rec *r)
{
if ((strcmp(r->handler, "websocket-handler") == 0) &&
(r->method_number == M_GET) && (r->parsed_uri.path != NULL) &&
(r->headers_in != NULL)) {
const char *upgrade = apr_table_get(r->headers_in, "Upgrade");
const char *connection = apr_table_get(r->headers_in, "Connection");
int upgrade_connection = 0;
if ((upgrade != NULL) &&
(connection != NULL) && !strcasecmp(upgrade, "WebSocket")) {
upgrade_connection = !strcasecmp(connection, "Upgrade");
if (!upgrade_connection) {
char *token = ap_get_token(r->pool, &connection, 0);
while (token && *token) { /* Parse the Connection value */
upgrade_connection = !strcasecmp(token, "Upgrade");
if (upgrade_connection) {
break;
}
while (*connection == ';') {
++connection;
ap_get_token(r->pool, &connection, 0); /* Skip parameters */
}
if (*connection++ != ',') {
break; /* Invalid without comma */
}
token =
(*connection) ? ap_get_token(r->pool, &connection,
0) : NULL;
}
}
}
if (upgrade_connection) {
/* Need to serialize the connections to minimize a denial of service attack -- FIXME */
const char *host = apr_table_get(r->headers_in, "Host");
const char *sec_websocket_key =
apr_table_get(r->headers_in, "Sec-WebSocket-Key");
const char *sec_websocket_version =
apr_table_get(r->headers_in, "Sec-WebSocket-Version");
apr_int64_t protocol_version =
(sec_websocket_version !=
NULL) ? apr_atoi64(sec_websocket_version) : 0;
if ((host != NULL) &&
(sec_websocket_key != NULL) &&
((protocol_version == 7) ||
(protocol_version == 8) || (protocol_version == 13))) {
/* const char *sec_websocket_origin = apr_table_get(r->headers_in, "Sec-WebSocket-Origin"); */
/* const char *origin = apr_table_get(r->headers_in, "Origin"); */
/* We need to validate the Host and Origin -- FIXME */
websocket_config_rec *conf = (websocket_config_rec *)
ap_get_module_config(r->per_dir_config,
&websocket_module);
if ((conf != NULL) && (conf->plugin != NULL)) {
WebSocketState state =
{ r, NULL, NULL, NULL, 0, protocol_version };
WebSocketServer server = {
sizeof(WebSocketServer), 1, &state,
mod_websocket_request, mod_websocket_header_get,
mod_websocket_header_set,
mod_websocket_protocol_count,
mod_websocket_protocol_index,
mod_websocket_protocol_set,
mod_websocket_plugin_send, mod_websocket_plugin_close
};
const char *sec_websocket_protocol =
apr_table_get(r->headers_in, "Sec-WebSocket-Protocol");
void *plugin_private = NULL;
ap_filter_t *input_filter;
/*
* Since we are handling a WebSocket connection, not a standard HTTP
* connection, remove the HTTP input filter.
*/
for (input_filter = r->input_filters;
input_filter != NULL;
input_filter = input_filter->next) {
if ((input_filter->frec != NULL) &&
(input_filter->frec->name != NULL) &&
!strcasecmp(input_filter->frec->name, "http_in")) {
ap_remove_input_filter(input_filter);
break;
}
}
apr_table_clear(r->headers_out);
apr_table_setn(r->headers_out, "Upgrade", "websocket");
apr_table_setn(r->headers_out, "Connection", "Upgrade");
/* Set the expected acceptance response */
mod_websocket_handshake(&server, sec_websocket_key);
/* Handle the WebSocket protocol */
if (sec_websocket_protocol != NULL) {
/* Parse the WebSocket protocol entry */
mod_websocket_parse_protocol(&server,
sec_websocket_protocol);
if (mod_websocket_protocol_count(&server) > 0) {
/*
* Default to using the first protocol in the list
* (plugin should overide this in on_connect)
*/
mod_websocket_protocol_set(&server,
mod_websocket_protocol_index
(&server, 0));
}
}
apr_thread_mutex_create(&state.mutex,
APR_THREAD_MUTEX_DEFAULT,
r->pool);
apr_thread_mutex_lock(state.mutex);
/*
* If the plugin supplies an on_connect function, it must
* return non-null on success
*/
if ((conf->plugin->on_connect == NULL) ||
((plugin_private =
conf->plugin->on_connect(&server)) != NULL)) {
/*
* Now that the connection has been established,
* disable the socket timeout
*/
apr_socket_timeout_set(ap_get_module_config
(r->connection->conn_config,
&core_module), -1);
/* Set response status code and status line */
r->status = HTTP_SWITCHING_PROTOCOLS;
r->status_line = ap_get_status_line(r->status);
/* Send the headers */
ap_send_interim_response(r, 1);
/* The main data framing loop */
mod_websocket_data_framing(&server, conf,
plugin_private);
apr_thread_mutex_unlock(state.mutex);
/* Tell the plugin that we are disconnecting */
if (conf->plugin->on_disconnect != NULL) {
conf->plugin->on_disconnect(plugin_private,
&server);
}
r->connection->keepalive = AP_CONN_CLOSE;
}
else {
apr_table_clear(r->headers_out);
/* The connection has been refused */
r->status = HTTP_FORBIDDEN;
r->status_line = ap_get_status_line(r->status);
r->header_only = 1;
r->connection->keepalive = AP_CONN_CLOSE;
ap_send_error_response(r, 0);
apr_thread_mutex_unlock(state.mutex);
}
/* Close the connection */
ap_lingering_close(r->connection);
apr_thread_mutex_destroy(state.mutex);
return OK;
}
}
}
}
return DECLINED;
}
static const command_rec websocket_cmds[] = {