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/*
* Copyright (c) 2014 DeNA Co., Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>
#include "h2o/websocket.h"
#define WS_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
static void create_accept_key(char *dst, const char *client_key)
{
uint8_t sha1buf[20], key_src[60];
memcpy(key_src, client_key, 24);
memcpy(key_src + 24, WS_GUID, 36);
SHA1(key_src, sizeof(key_src), sha1buf);
h2o_base64_encode(dst, sha1buf, sizeof(sha1buf), 0);
dst[28] = '\0';
}
static void on_close(h2o_websocket_conn_t *conn)
{
(*conn->cb)(conn, NULL);
}
static void on_recv(h2o_socket_t *sock, const char *err)
{
h2o_websocket_conn_t *conn = sock->data;
if (err != NULL) {
on_close(conn);
return;
}
h2o_websocket_proceed(conn);
}
static void on_write_complete(h2o_socket_t *sock, const char *err)
{
h2o_websocket_conn_t *conn = sock->data;
if (err != NULL) {
on_close(conn);
return;
}
h2o_websocket_proceed(conn);
}
static ssize_t recv_callback(wslay_event_context_ptr ctx, uint8_t *buf, size_t len, int flags, void *_conn)
{
h2o_websocket_conn_t *conn = _conn;
/* return WOULDBLOCK if no data */
if (conn->sock->input->size == 0) {
wslay_event_set_error(conn->ws_ctx, WSLAY_ERR_WOULDBLOCK);
return -1;
}
if (conn->sock->input->size < len)
len = conn->sock->input->size;
memcpy(buf, conn->sock->input->bytes, len);
h2o_buffer_consume(&conn->sock->input, len);
return len;
}
static ssize_t send_callback(wslay_event_context_ptr ctx, const uint8_t *data, size_t len, int flags, void *_conn)
{
h2o_websocket_conn_t *conn = _conn;
h2o_iovec_t buf;
/* return WOULDBLOCK if pending (TODO: queue fixed number of chunks, instead of only one) */
if (h2o_socket_is_writing(conn->sock)) {
wslay_event_set_error(conn->ws_ctx, WSLAY_ERR_WOULDBLOCK);
return -1;
}
/* copy data */
conn->_write_buf = h2o_mem_realloc(conn->_write_buf, len);
memcpy(conn->_write_buf, data, len);
/* write */
buf.base = conn->_write_buf;
buf.len = len;
h2o_socket_write(conn->sock, &buf, 1, on_write_complete);
return len;
}
static void on_msg_callback(wslay_event_context_ptr ctx, const struct wslay_event_on_msg_recv_arg *arg, void *_conn)
{
h2o_websocket_conn_t *conn = _conn;
(*conn->cb)(conn, arg);
}
static void on_complete(void *user_data, h2o_socket_t *sock, size_t reqsize)
{
h2o_websocket_conn_t *conn = user_data;
/* close the connection on error */
if (sock == NULL) {
(*conn->cb)(conn, NULL);
return;
}
conn->sock = sock;
sock->data = conn;
h2o_buffer_consume(&sock->input, reqsize);
h2o_websocket_proceed(conn);
}
h2o_websocket_conn_t *h2o_upgrade_to_websocket(h2o_req_t *req, const char *client_key, void *data, h2o_websocket_msg_callback cb)
{
h2o_websocket_conn_t *conn = h2o_mem_alloc(sizeof(*conn));
char accept_key[29];
/* only for http1 connection */
assert(req->version < 0x200);
/* setup the context */
memset(conn, 0, sizeof(*conn));
// conn->sock = sock; set by on_complete
conn->ws_callbacks.recv_callback = recv_callback;
conn->ws_callbacks.send_callback = send_callback;
conn->ws_callbacks.on_msg_recv_callback = on_msg_callback;
conn->data = data;
conn->cb = cb;
wslay_event_context_server_init(&conn->ws_ctx, &conn->ws_callbacks, conn);
/* build response */
create_accept_key(accept_key, client_key);
req->res.status = 101;
req->res.reason = "Switching Protocols";
h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_UPGRADE, NULL, H2O_STRLIT("websocket"));
h2o_add_header_by_str(&req->pool, &req->res.headers, H2O_STRLIT("sec-websocket-accept"), 0, NULL, accept_key,
strlen(accept_key));
/* send */
h2o_http1_upgrade(req, NULL, 0, on_complete, conn);
return conn;
}
int h2o_is_websocket_handshake(h2o_req_t *req, const char **ws_client_key)
{
ssize_t key_header_index;
*ws_client_key = NULL;
/* method */
if (h2o_memis(req->input.method.base, req->input.method.len, H2O_STRLIT("GET"))) {
/* ok */
} else {
return 0;
}
/* upgrade header */
if (req->upgrade.base != NULL && h2o_lcstris(req->upgrade.base, req->upgrade.len, H2O_STRLIT("websocket"))) {
/* ok */
} else {
return 0;
}
/* sec-websocket-key header */
if ((key_header_index = h2o_find_header_by_str(&req->headers, H2O_STRLIT("sec-websocket-key"), -1)) != -1) {
if (req->headers.entries[key_header_index].value.len != 24) {
return -1;
}
} else {
return 0;
}
*ws_client_key = req->headers.entries[key_header_index].value.base;
return 0;
}
void h2o_websocket_close(h2o_websocket_conn_t *conn)
{
if (conn->sock != NULL)
h2o_socket_close(conn->sock);
free(conn->_write_buf);
wslay_event_context_free(conn->ws_ctx);
free(conn);
}
void h2o_websocket_proceed(h2o_websocket_conn_t *conn)
{
int handled;
/* run the loop until getting to a point where no more progress can be achieved */
do {
handled = 0;
if (!h2o_socket_is_writing(conn->sock) && wslay_event_want_write(conn->ws_ctx)) {
if (wslay_event_send(conn->ws_ctx) != 0) {
goto Close;
}
handled = 1;
}
if (conn->sock->input->size != 0 && wslay_event_want_read(conn->ws_ctx)) {
if (wslay_event_recv(conn->ws_ctx) != 0) {
goto Close;
}
handled = 1;
}
} while (handled);
if (wslay_event_want_read(conn->ws_ctx)) {
h2o_socket_read_start(conn->sock, on_recv);
} else if (h2o_socket_is_writing(conn->sock) || wslay_event_want_write(conn->ws_ctx)) {
h2o_socket_read_stop(conn->sock);
} else {
/* nothing is going on... close the socket */
goto Close;
}
return;
Close:
on_close(conn);
}
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