2010-11-08 20:20:42 +00:00
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/*
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* libwebsockets - small server side websockets and web server implementation
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2010-11-13 10:03:47 +00:00
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*
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2010-11-08 20:20:42 +00:00
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* Copyright (C) 2010 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include "private-libwebsockets.h"
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const struct lws_tokens lws_tokens[WSI_TOKEN_COUNT] = {
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{ "GET ", 4 },
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{ "Host:", 5 },
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{ "Connection:", 11 },
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{ "Sec-WebSocket-Key1:", 19 },
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{ "Sec-WebSocket-Key2:", 19 },
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{ "Sec-WebSocket-Protocol:", 23 },
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{ "Upgrade:", 8 },
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{ "Origin:", 7 },
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2010-11-11 12:48:13 +00:00
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{ "Sec-WebSocket-Draft:", 20 },
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2010-11-08 20:20:42 +00:00
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{ "\x0d\x0a", 2 },
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};
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int libwebsocket_parse(struct libwebsocket *wsi, unsigned char c)
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{
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int n;
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switch (wsi->parser_state) {
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case WSI_TOKEN_GET_URI:
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case WSI_TOKEN_HOST:
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case WSI_TOKEN_CONNECTION:
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case WSI_TOKEN_KEY1:
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case WSI_TOKEN_KEY2:
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case WSI_TOKEN_PROTOCOL:
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case WSI_TOKEN_UPGRADE:
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case WSI_TOKEN_ORIGIN:
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2010-11-11 12:48:13 +00:00
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case WSI_TOKEN_DRAFT:
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2010-11-08 20:20:42 +00:00
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case WSI_TOKEN_CHALLENGE:
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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debug("WSI_TOKEN_(%d) '%c'\n", wsi->parser_state, c);
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/* collect into malloc'd buffers */
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/* optional space swallow */
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if (!wsi->utf8_token[wsi->parser_state].token_len && c == ' ')
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break;
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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/* special case space terminator for get-uri */
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if (wsi->parser_state == WSI_TOKEN_GET_URI && c == ' ') {
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wsi->utf8_token[wsi->parser_state].token[
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wsi->utf8_token[wsi->parser_state].token_len] = '\0';
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wsi->parser_state = WSI_TOKEN_SKIPPING;
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break;
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}
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/* allocate appropriate memory */
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if (wsi->utf8_token[wsi->parser_state].token_len ==
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wsi->current_alloc_len - 1) {
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/* need to extend */
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wsi->current_alloc_len += LWS_ADDITIONAL_HDR_ALLOC;
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if (wsi->current_alloc_len >= LWS_MAX_HEADER_LEN) {
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/* it's waaay to much payload, fail it */
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strcpy(wsi->utf8_token[wsi->parser_state].token,
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"!!! Length exceeded maximum supported !!!");
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wsi->parser_state = WSI_TOKEN_SKIPPING;
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break;
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}
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wsi->utf8_token[wsi->parser_state].token =
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realloc(wsi->utf8_token[wsi->parser_state].token,
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wsi->current_alloc_len);
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}
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/* bail at EOL */
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if (wsi->parser_state != WSI_TOKEN_CHALLENGE && c == '\x0d') {
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wsi->utf8_token[wsi->parser_state].token[
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wsi->utf8_token[wsi->parser_state].token_len] = '\0';
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wsi->parser_state = WSI_TOKEN_SKIPPING_SAW_CR;
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break;
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}
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wsi->utf8_token[wsi->parser_state].token[
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wsi->utf8_token[wsi->parser_state].token_len++] = c;
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/* special payload limiting */
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if (wsi->parser_state == WSI_TOKEN_CHALLENGE &&
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wsi->utf8_token[wsi->parser_state].token_len == 8) {
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debug("Setting WSI_PARSING_COMPLETE\n");
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wsi->parser_state = WSI_PARSING_COMPLETE;
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break;
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}
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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break;
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/* collecting and checking a name part */
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case WSI_TOKEN_NAME_PART:
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debug("WSI_TOKEN_NAME_PART '%c'\n", c);
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if (wsi->name_buffer_pos == sizeof(wsi->name_buffer) - 1) {
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/* name bigger than we can handle, skip until next */
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wsi->parser_state = WSI_TOKEN_SKIPPING;
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break;
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}
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wsi->name_buffer[wsi->name_buffer_pos++] = c;
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wsi->name_buffer[wsi->name_buffer_pos] = '\0';
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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for (n = 0; n < WSI_TOKEN_COUNT; n++) {
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if (wsi->name_buffer_pos != lws_tokens[n].token_len)
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continue;
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if (strcmp(lws_tokens[n].token, wsi->name_buffer))
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continue;
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debug("known hdr '%s'\n", wsi->name_buffer);
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wsi->parser_state = WSI_TOKEN_GET_URI + n;
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wsi->current_alloc_len = LWS_INITIAL_HDR_ALLOC;
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wsi->utf8_token[wsi->parser_state].token =
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malloc(wsi->current_alloc_len);
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wsi->utf8_token[wsi->parser_state].token_len = 0;
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n = WSI_TOKEN_COUNT;
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}
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/* colon delimiter means we just don't know this name */
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if (wsi->parser_state == WSI_TOKEN_NAME_PART && c == ':') {
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debug("skipping unknown header '%s'\n",
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wsi->name_buffer);
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wsi->parser_state = WSI_TOKEN_SKIPPING;
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break;
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}
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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/* don't look for payload when it can just be http headers */
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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if (wsi->parser_state == WSI_TOKEN_CHALLENGE &&
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!wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len) {
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/* they're HTTP headers, not websocket upgrade! */
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debug("Setting WSI_PARSING_COMPLETE "
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"from http headers\n");
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wsi->parser_state = WSI_PARSING_COMPLETE;
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}
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break;
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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/* skipping arg part of a name we didn't recognize */
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case WSI_TOKEN_SKIPPING:
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debug("WSI_TOKEN_SKIPPING '%c'\n", c);
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if (c == '\x0d')
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wsi->parser_state = WSI_TOKEN_SKIPPING_SAW_CR;
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break;
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case WSI_TOKEN_SKIPPING_SAW_CR:
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debug("WSI_TOKEN_SKIPPING_SAW_CR '%c'\n", c);
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if (c == '\x0a')
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wsi->parser_state = WSI_TOKEN_NAME_PART;
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else
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wsi->parser_state = WSI_TOKEN_SKIPPING;
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wsi->name_buffer_pos = 0;
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break;
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/* we're done, ignore anything else */
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case WSI_PARSING_COMPLETE:
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debug("WSI_PARSING_COMPLETE '%c'\n", c);
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break;
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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default: /* keep gcc happy */
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break;
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}
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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return 0;
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}
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static int libwebsocket_rx_sm(struct libwebsocket *wsi, unsigned char c)
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{
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int n;
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unsigned char buf[2];
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switch (wsi->lws_rx_parse_state) {
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case LWS_RXPS_NEW:
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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switch (wsi->ietf_spec_revision) {
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/* Firefox 4.0b6 likes this as of 30 Oct */
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case 76:
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if (c == 0xff)
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wsi->lws_rx_parse_state = LWS_RXPS_SEEN_76_FF;
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break;
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case 0:
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break;
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}
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2010-11-11 09:22:22 +00:00
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if (c == 0) {
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wsi->lws_rx_parse_state = LWS_RXPS_EAT_UNTIL_76_FF;
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wsi->rx_user_buffer_head = 0;
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}
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break;
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case LWS_RXPS_EAT_UNTIL_76_FF:
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if (c == 0xff) {
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wsi->lws_rx_parse_state = LWS_RXPS_NEW;
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goto issue;
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}
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wsi->rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING +
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(wsi->rx_user_buffer_head++)] = c;
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if (wsi->rx_user_buffer_head != MAX_USER_RX_BUFFER)
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break;
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issue:
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2010-11-12 10:44:16 +00:00
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if (wsi->protocol->callback)
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wsi->protocol->callback(wsi, LWS_CALLBACK_RECEIVE,
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2010-11-12 11:15:49 +00:00
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wsi->user_space,
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2010-11-11 09:22:22 +00:00
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&wsi->rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING],
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wsi->rx_user_buffer_head);
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wsi->rx_user_buffer_head = 0;
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2010-11-08 20:20:42 +00:00
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break;
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case LWS_RXPS_SEEN_76_FF:
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if (c)
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break;
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debug("Seen that client is requesting "
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"a v76 close, sending ack\n");
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buf[0] = 0xff;
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buf[1] = 0;
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n = libwebsocket_write(wsi, buf, 2, LWS_WRITE_HTTP);
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if (n < 0) {
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fprintf(stderr, "ERROR writing to socket");
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return -1;
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}
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debug(" v76 close ack sent, server closing skt\n");
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/* returning < 0 will get it closed in parent */
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return -1;
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case LWS_RXPS_PULLING_76_LENGTH:
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break;
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case LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED:
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break;
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}
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return 0;
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}
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int libwebsocket_interpret_incoming_packet(struct libwebsocket *wsi,
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unsigned char *buf, size_t len)
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{
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int n;
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2010-11-11 13:19:19 +00:00
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#ifdef DEBUG
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2010-11-08 20:20:42 +00:00
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fprintf(stderr, "received %d byte packet\n", (int)len);
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for (n = 0; n < len; n++)
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fprintf(stderr, "%02X ", buf[n]);
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fprintf(stderr, "\n");
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2010-11-11 13:19:19 +00:00
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#endif
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2010-11-08 20:20:42 +00:00
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/* let the rx protocol state machine have as much as it needs */
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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n = 0;
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while (wsi->lws_rx_parse_state !=
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LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED && n < len)
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if (libwebsocket_rx_sm(wsi, buf[n++]) < 0)
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return -1;
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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return -0;
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}
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/**
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* libwebsocket_write() - Apply protocol then write data to client
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* @wsi: Websocket instance (available from user callback)
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* @buf: The data to send. For data being sent on a websocket
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* connection (ie, not default http), this buffer MUST have
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* LWS_SEND_BUFFER_PRE_PADDING bytes valid BEFORE the pointer
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* and an additional LWS_SEND_BUFFER_POST_PADDING bytes valid
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* in the buffer after (buf + len). This is so the protocol
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* header and trailer data can be added in-situ.
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* @len: Count of the data bytes in the payload starting from buf
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* @protocol: Use LWS_WRITE_HTTP to reply to an http connection, and one
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* of LWS_WRITE_BINARY or LWS_WRITE_TEXT to send appropriate
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* data on a websockets connection. Remember to allow the extra
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* bytes before and after buf if LWS_WRITE_BINARY or LWS_WRITE_TEXT
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* are used.
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*
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* This function provides the way to issue data back to the client
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* for both http and websocket protocols.
|
2010-11-13 10:03:47 +00:00
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*
|
2010-11-08 20:20:42 +00:00
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* In the case of sending using websocket protocol, be sure to allocate
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* valid storage before and after buf as explained above. This scheme
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* allows maximum efficiency of sending data and protocol in a single
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* packet while not burdening the user code with any protocol knowledge.
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*/
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|
2010-11-13 10:03:47 +00:00
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int libwebsocket_write(struct libwebsocket *wsi, unsigned char *buf,
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2010-11-08 20:20:42 +00:00
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size_t len, enum libwebsocket_write_protocol protocol)
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{
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int n;
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int pre = 0;
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int post = 0;
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unsigned int shift = 7;
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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if (protocol == LWS_WRITE_HTTP)
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goto send_raw;
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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/* websocket protocol, either binary or text */
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2010-11-13 10:03:47 +00:00
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2010-11-08 20:20:42 +00:00
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if (wsi->state != WSI_STATE_ESTABLISHED)
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return -1;
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switch (wsi->ietf_spec_revision) {
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/* chrome likes this as of 30 Oct */
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/* Firefox 4.0b6 likes this as of 30 Oct */
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case 76:
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if (protocol == LWS_WRITE_BINARY) {
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/* in binary mode we send 7-bit used length blocks */
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pre = 1;
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while (len & (127 << shift)) {
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pre++;
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shift += 7;
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}
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n = 0;
|
|
|
|
shift -= 7;
|
|
|
|
while (shift >= 0) {
|
|
|
|
if (shift)
|
|
|
|
buf[0 - pre + n] =
|
|
|
|
((len >> shift) & 127) | 0x80;
|
|
|
|
else
|
|
|
|
buf[0 - pre + n] =
|
|
|
|
((len >> shift) & 127);
|
|
|
|
n++;
|
|
|
|
shift -= 7;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* frame type = text, length-free spam mode */
|
|
|
|
|
|
|
|
buf[-1] = 0;
|
|
|
|
buf[len] = 0xff; /* EOT marker */
|
|
|
|
pre = 1;
|
|
|
|
post = 1;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 0:
|
|
|
|
buf[-9] = 0xff;
|
|
|
|
#if defined __LP64__
|
|
|
|
buf[-8] = len >> 56;
|
|
|
|
buf[-7] = len >> 48;
|
|
|
|
buf[-6] = len >> 40;
|
|
|
|
buf[-5] = len >> 32;
|
|
|
|
#else
|
|
|
|
buf[-8] = 0;
|
|
|
|
buf[-7] = 0;
|
|
|
|
buf[-6] = 0;
|
|
|
|
buf[-5] = 0;
|
|
|
|
#endif
|
|
|
|
buf[-4] = len >> 24;
|
|
|
|
buf[-3] = len >> 16;
|
|
|
|
buf[-2] = len >> 8;
|
|
|
|
buf[-1] = len;
|
|
|
|
pre = 9;
|
|
|
|
break;
|
2010-11-13 10:03:47 +00:00
|
|
|
|
2010-11-08 20:20:42 +00:00
|
|
|
/* just an unimplemented spec right now apparently */
|
|
|
|
case 2:
|
|
|
|
n = 4; /* text */
|
|
|
|
if (protocol == LWS_WRITE_BINARY)
|
|
|
|
n = 5; /* binary */
|
|
|
|
if (len < 126) {
|
|
|
|
buf[-2] = n;
|
|
|
|
buf[-1] = len;
|
|
|
|
pre = 2;
|
|
|
|
} else {
|
|
|
|
if (len < 65536) {
|
|
|
|
buf[-4] = n;
|
|
|
|
buf[-3] = 126;
|
|
|
|
buf[-2] = len >> 8;
|
|
|
|
buf[-1] = len;
|
|
|
|
pre = 4;
|
|
|
|
} else {
|
|
|
|
buf[-10] = n;
|
|
|
|
buf[-9] = 127;
|
|
|
|
#if defined __LP64__
|
|
|
|
buf[-8] = (len >> 56) & 0x7f;
|
|
|
|
buf[-7] = len >> 48;
|
|
|
|
buf[-6] = len >> 40;
|
|
|
|
buf[-5] = len >> 32;
|
|
|
|
#else
|
|
|
|
buf[-8] = 0;
|
|
|
|
buf[-7] = 0;
|
|
|
|
buf[-6] = 0;
|
|
|
|
buf[-5] = 0;
|
|
|
|
#endif
|
|
|
|
buf[-4] = len >> 24;
|
|
|
|
buf[-3] = len >> 16;
|
|
|
|
buf[-2] = len >> 8;
|
|
|
|
buf[-1] = len;
|
|
|
|
pre = 10;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
for (n = 0; n < (len + pre + post); n++)
|
|
|
|
fprintf(stderr, "%02X ", buf[n - pre]);
|
2010-11-13 10:03:47 +00:00
|
|
|
|
2010-11-08 20:20:42 +00:00
|
|
|
fprintf(stderr, "\n");
|
|
|
|
#endif
|
|
|
|
|
|
|
|
send_raw:
|
|
|
|
#ifdef LWS_OPENSSL_SUPPORT
|
|
|
|
if (use_ssl) {
|
|
|
|
n = SSL_write(wsi->ssl, buf - pre, len + pre + post);
|
|
|
|
if (n < 0) {
|
|
|
|
fprintf(stderr, "ERROR writing to socket");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
#endif
|
|
|
|
n = send(wsi->sock, buf - pre, len + pre + post, 0);
|
|
|
|
if (n < 0) {
|
|
|
|
fprintf(stderr, "ERROR writing to socket");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
#ifdef LWS_OPENSSL_SUPPORT
|
|
|
|
}
|
|
|
|
#endif
|
2010-11-13 10:03:47 +00:00
|
|
|
debug("written %d bytes to client\n", (int)len);
|
|
|
|
|
2010-11-08 20:20:42 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* libwebsockets_serve_http_file() - Send a file back to the client using http
|
|
|
|
* @wsi: Websocket instance (available from user callback)
|
|
|
|
* @file: The file to issue over http
|
|
|
|
* @content_type: The http content type, eg, text/html
|
2010-11-13 10:03:47 +00:00
|
|
|
*
|
2010-11-08 20:20:42 +00:00
|
|
|
* This function is intended to be called from the callback in response
|
|
|
|
* to http requests from the client. It allows the callback to issue
|
|
|
|
* local files down the http link in a single step.
|
|
|
|
*/
|
|
|
|
|
2010-11-13 10:03:47 +00:00
|
|
|
int libwebsockets_serve_http_file(struct libwebsocket *wsi, const char *file,
|
|
|
|
const char *content_type)
|
2010-11-08 20:20:42 +00:00
|
|
|
{
|
|
|
|
int fd;
|
|
|
|
struct stat stat;
|
|
|
|
char buf[512];
|
|
|
|
char *p = buf;
|
|
|
|
int n;
|
|
|
|
|
|
|
|
fd = open(file, O_RDONLY);
|
|
|
|
if (fd < 1) {
|
|
|
|
p += sprintf(p, "HTTP/1.0 400 Bad\x0d\x0a"
|
|
|
|
"Server: libwebsockets\x0d\x0a"
|
|
|
|
"\x0d\x0a"
|
|
|
|
);
|
|
|
|
libwebsocket_write(wsi, (unsigned char *)buf, p - buf,
|
|
|
|
LWS_WRITE_HTTP);
|
2010-11-13 10:03:47 +00:00
|
|
|
|
2010-11-08 20:20:42 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
fstat(fd, &stat);
|
|
|
|
p += sprintf(p, "HTTP/1.0 200 OK\x0d\x0a"
|
|
|
|
"Server: libwebsockets\x0d\x0a"
|
|
|
|
"Content-Type: %s\x0d\x0a"
|
|
|
|
"Content-Length: %u\x0d\x0a"
|
|
|
|
"\x0d\x0a", content_type, (unsigned int)stat.st_size);
|
2010-11-13 10:03:47 +00:00
|
|
|
|
2010-11-08 20:20:42 +00:00
|
|
|
libwebsocket_write(wsi, (unsigned char *)buf, p - buf, LWS_WRITE_HTTP);
|
|
|
|
|
|
|
|
n = 1;
|
|
|
|
while (n > 0) {
|
|
|
|
n = read(fd, buf, 512);
|
|
|
|
libwebsocket_write(wsi, (unsigned char *)buf, n,
|
|
|
|
LWS_WRITE_HTTP);
|
|
|
|
}
|
2010-11-13 10:03:47 +00:00
|
|
|
|
2010-11-08 20:20:42 +00:00
|
|
|
close(fd);
|
2010-11-13 10:03:47 +00:00
|
|
|
|
2010-11-08 20:20:42 +00:00
|
|
|
return 0;
|
|
|
|
}
|