Start changing HTTP parser.
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*.o
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test
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test_g
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Contributors must agree to the Contributor License Agreement before patches
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can be accepted.
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http://spreadsheets2.google.com/viewform?hl=en&formkey=dDJXOGUwbzlYaWM4cHN1MERwQS1CSnc6MQ
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Copyright 2009,2010 Ryan Dahl <ry@tinyclouds.org>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to
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deal in the Software without restriction, including without limitation the
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rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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HTTP Parser
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===========
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This is a parser for HTTP messages written in C. It parses both requests and
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responses. The parser is designed to be used in performance HTTP
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applications. It does not make any syscalls nor allocations, it does not
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buffer data, it can be interrupted at anytime. Depending on your
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architecture, it only requires about 40 bytes of data per message
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stream (in a web server that is per connection).
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Features:
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* No dependencies
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* Handles persistent streams (keep-alive).
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* Decodes chunked encoding.
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* Upgrade support
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* Defends against buffer overflow attacks.
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The parser extracts the following information from HTTP messages:
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* Header fields and values
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* Content-Length
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* Request method
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* Response status code
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* Transfer-Encoding
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* HTTP version
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* Request path, query string, fragment
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* Message body
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Usage
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-----
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One `http_parser` object is used per TCP connection. Initialize the struct
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using `http_parser_init()` and set the callbacks. That might look something
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like this for a request parser:
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http_parser_settings settings;
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settings.on_path = my_path_callback;
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settings.on_header_field = my_header_field_callback;
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/* ... */
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http_parser *parser = malloc(sizeof(http_parser));
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http_parser_init(parser, HTTP_REQUEST);
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parser->data = my_socket;
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When data is received on the socket execute the parser and check for errors.
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size_t len = 80*1024, nparsed;
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char buf[len];
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ssize_t recved;
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recved = recv(fd, buf, len, 0);
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if (recved < 0) {
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/* Handle error. */
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}
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/* Start up / continue the parser.
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* Note we pass recved==0 to signal that EOF has been recieved.
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*/
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nparsed = http_parser_execute(parser, &settings, buf, recved);
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if (parser->upgrade) {
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/* handle new protocol */
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} else if (nparsed != recved) {
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/* Handle error. Usually just close the connection. */
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}
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HTTP needs to know where the end of the stream is. For example, sometimes
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servers send responses without Content-Length and expect the client to
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consume input (for the body) until EOF. To tell http_parser about EOF, give
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`0` as the forth parameter to `http_parser_execute()`. Callbacks and errors
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can still be encountered during an EOF, so one must still be prepared
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to receive them.
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Scalar valued message information such as `status_code`, `method`, and the
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HTTP version are stored in the parser structure. This data is only
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temporally stored in `http_parser` and gets reset on each new message. If
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this information is needed later, copy it out of the structure during the
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`headers_complete` callback.
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The parser decodes the transfer-encoding for both requests and responses
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transparently. That is, a chunked encoding is decoded before being sent to
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the on_body callback.
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The Special Problem of Upgrade
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------------------------------
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HTTP supports upgrading the connection to a different protocol. An
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increasingly common example of this is the Web Socket protocol which sends
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a request like
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GET /demo HTTP/1.1
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Upgrade: WebSocket
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Connection: Upgrade
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Host: example.com
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Origin: http://example.com
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WebSocket-Protocol: sample
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followed by non-HTTP data.
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(See http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-75 for more
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information the Web Socket protocol.)
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To support this, the parser will treat this as a normal HTTP message without a
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body. Issuing both on_headers_complete and on_message_complete callbacks. However
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http_parser_execute() will stop parsing at the end of the headers and return.
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The user is expected to check if `parser->upgrade` has been set to 1 after
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`http_parser_execute()` returns. Non-HTTP data begins at the buffer supplied
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offset by the return value of `http_parser_execute()`.
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Callbacks
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---------
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During the `http_parser_execute()` call, the callbacks set in
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`http_parser_settings` will be executed. The parser maintains state and
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never looks behind, so buffering the data is not necessary. If you need to
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save certain data for later usage, you can do that from the callbacks.
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There are two types of callbacks:
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* notification `typedef int (*http_cb) (http_parser*);`
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Callbacks: on_message_begin, on_headers_complete, on_message_complete.
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* data `typedef int (*http_data_cb) (http_parser*, const char *at, size_t length);`
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Callbacks: (requests only) on_path, on_query_string, on_uri, on_fragment,
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(common) on_header_field, on_header_value, on_body;
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Callbacks must return 0 on success. Returning a non-zero value indicates
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error to the parser, making it exit immediately.
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In case you parse HTTP message in chunks (i.e. `read()` request line
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from socket, parse, read half headers, parse, etc) your data callbacks
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may be called more than once. Http-parser guarantees that data pointer is only
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valid for the lifetime of callback. You can also `read()` into a heap allocated
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buffer to avoid copying memory around if this fits your application.
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Reading headers may be a tricky task if you read/parse headers partially.
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Basically, you need to remember whether last header callback was field or value
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and apply following logic:
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(on_header_field and on_header_value shortened to on_h_*)
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------------------------ ------------ --------------------------------------------
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| State (prev. callback) | Callback | Description/action |
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------------------------ ------------ --------------------------------------------
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| nothing (first call) | on_h_field | Allocate new buffer and copy callback data |
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| | | into it |
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------------------------ ------------ --------------------------------------------
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| value | on_h_field | New header started. |
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| | | Copy current name,value buffers to headers |
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| | | list and allocate new buffer for new name |
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------------------------ ------------ --------------------------------------------
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| field | on_h_field | Previous name continues. Reallocate name |
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| | | buffer and append callback data to it |
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------------------------ ------------ --------------------------------------------
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| field | on_h_value | Value for current header started. Allocate |
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| | | new buffer and copy callback data to it |
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------------------------ ------------ --------------------------------------------
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| value | on_h_value | Value continues. Reallocate value buffer |
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| | | and append callback data to it |
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------------------------ ------------ --------------------------------------------
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See examples of reading in headers:
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* [partial example](http://gist.github.com/155877) in C
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* [from http-parser tests](http://github.com/ry/http-parser/blob/37a0ff8928fb0d83cec0d0d8909c5a4abcd221af/test.c#L403) in C
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* [from Node library](http://github.com/ry/node/blob/842eaf446d2fdcb33b296c67c911c32a0dabc747/src/http.js#L284) in Javascript
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/* Copyright 2009,2010 Ryan Dahl <ry@tinyclouds.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef http_parser_h
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#define http_parser_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/types.h>
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#if defined(_WIN32) && !defined(__MINGW32__)
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typedef __int8 int8_t;
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typedef unsigned __int8 uint8_t;
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typedef __int16 int16_t;
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typedef unsigned __int16 uint16_t;
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typedef __int32 int32_t;
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typedef unsigned __int32 uint32_t;
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typedef __int64 int64_t;
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typedef unsigned __int64 uint64_t;
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typedef unsigned int size_t;
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typedef int ssize_t;
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#else
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#include <stdint.h>
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#endif
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/* Compile with -DHTTP_PARSER_STRICT=0 to make less checks, but run
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* faster
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*/
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#ifndef HTTP_PARSER_STRICT
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# define HTTP_PARSER_STRICT 1
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#else
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# define HTTP_PARSER_STRICT 0
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#endif
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/* Maximium header size allowed */
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#define HTTP_MAX_HEADER_SIZE (80*1024)
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typedef struct http_parser http_parser;
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typedef struct http_parser_settings http_parser_settings;
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/* Callbacks should return non-zero to indicate an error. The parser will
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* then halt execution.
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*
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* The one exception is on_headers_complete. In a HTTP_RESPONSE parser
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* returning '1' from on_headers_complete will tell the parser that it
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* should not expect a body. This is used when receiving a response to a
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* HEAD request which may contain 'Content-Length' or 'Transfer-Encoding:
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* chunked' headers that indicate the presence of a body.
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*
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* http_data_cb does not return data chunks. It will be call arbitrarally
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* many times for each string. E.G. you might get 10 callbacks for "on_path"
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* each providing just a few characters more data.
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*/
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typedef int (*http_data_cb) (http_parser*, const char *at, size_t length);
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typedef int (*http_cb) (http_parser*);
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/* Request Methods */
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enum http_method
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{ HTTP_DELETE = 0
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, HTTP_GET
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, HTTP_HEAD
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, HTTP_POST
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, HTTP_PUT
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/* pathological */
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, HTTP_CONNECT
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, HTTP_OPTIONS
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, HTTP_TRACE
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/* webdav */
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, HTTP_COPY
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, HTTP_LOCK
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, HTTP_MKCOL
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, HTTP_MOVE
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, HTTP_PROPFIND
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, HTTP_PROPPATCH
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, HTTP_UNLOCK
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/* subversion */
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, HTTP_REPORT
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, HTTP_MKACTIVITY
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, HTTP_CHECKOUT
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, HTTP_MERGE
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/* upnp */
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, HTTP_MSEARCH
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, HTTP_NOTIFY
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, HTTP_SUBSCRIBE
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, HTTP_UNSUBSCRIBE
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};
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enum http_parser_type { HTTP_REQUEST, HTTP_RESPONSE, HTTP_BOTH };
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struct http_parser {
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/** PRIVATE **/
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unsigned char type : 2;
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unsigned char flags : 6;
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unsigned char state;
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unsigned char header_state;
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unsigned char index;
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uint32_t nread;
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int64_t content_length;
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/** READ-ONLY **/
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unsigned short http_major;
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unsigned short http_minor;
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unsigned short status_code; /* responses only */
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unsigned char method; /* requests only */
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/* 1 = Upgrade header was present and the parser has exited because of that.
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* 0 = No upgrade header present.
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* Should be checked when http_parser_execute() returns in addition to
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* error checking.
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*/
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char upgrade;
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/** PUBLIC **/
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void *data; /* A pointer to get hook to the "connection" or "socket" object */
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};
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struct http_parser_settings {
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http_cb on_message_begin;
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http_data_cb on_path;
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http_data_cb on_query_string;
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http_data_cb on_url;
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http_data_cb on_fragment;
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http_data_cb on_header_field;
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http_data_cb on_header_value;
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http_cb on_headers_complete;
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http_data_cb on_body;
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http_cb on_message_complete;
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};
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void http_parser_init(http_parser *parser, enum http_parser_type type);
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size_t http_parser_execute(http_parser *parser,
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const http_parser_settings *settings,
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const char *data,
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size_t len);
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/* If http_should_keep_alive() in the on_headers_complete or
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* on_message_complete callback returns true, then this will be should be
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* the last message on the connection.
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* If you are the server, respond with the "Connection: close" header.
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* If you are the client, close the connection.
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*/
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int http_should_keep_alive(http_parser *parser);
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/* Returns a string version of the HTTP method. */
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const char *http_method_str(enum http_method);
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#ifdef __cplusplus
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}
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#endif
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#endif
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@ -0,0 +1,105 @@
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#include "http.h"
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#include "server.h"
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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struct http_client *
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||||||
|
http_client_new(int fd, struct server *s) {
|
||||||
|
|
||||||
|
struct http_client *c = calloc(1, sizeof(struct http_client));
|
||||||
|
c->fd = fd;
|
||||||
|
c->s = s;
|
||||||
|
|
||||||
|
c->settings.on_path = http_on_path;
|
||||||
|
c->settings.on_body = http_on_body;
|
||||||
|
http_parser_init(&c->parser, HTTP_REQUEST);
|
||||||
|
c->parser.data = c;
|
||||||
|
|
||||||
|
return c;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
void
|
||||||
|
http_client_read(int fd, short event, void *ctx) {
|
||||||
|
|
||||||
|
struct http_client *c = ctx;
|
||||||
|
char buffer[64*1024];
|
||||||
|
int ret, nparsed;
|
||||||
|
|
||||||
|
(void)fd;
|
||||||
|
(void)event;
|
||||||
|
|
||||||
|
ret = read(c->fd, buffer, sizeof(buffer));
|
||||||
|
if(ret <= 0) { /* broken connection, bye */
|
||||||
|
printf("close client %d\n", c->fd);
|
||||||
|
http_client_free(c);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
c->buffer = realloc(c->buffer, c->sz + ret);
|
||||||
|
memcpy(c->buffer + c->sz, buffer, ret);
|
||||||
|
c->sz += ret;
|
||||||
|
|
||||||
|
/* TODO: http parse. */
|
||||||
|
nparsed = http_parser_execute(&c->parser, &c->settings, buffer, ret);
|
||||||
|
if(c->parser.upgrade) {
|
||||||
|
/* TODO */
|
||||||
|
} else if(nparsed != ret) { /* invalid */
|
||||||
|
http_client_free(c);
|
||||||
|
}
|
||||||
|
/*
|
||||||
|
printf("parse %zd bytes: [", c->sz); fflush(stdout);
|
||||||
|
write(1, c->buffer, c->sz);
|
||||||
|
printf("]\n");
|
||||||
|
*/
|
||||||
|
|
||||||
|
|
||||||
|
/* carry on */
|
||||||
|
http_client_serve(c);
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
http_client_free(struct http_client *c) {
|
||||||
|
|
||||||
|
close(c->fd);
|
||||||
|
free(c->buffer);
|
||||||
|
free(c);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Add read event callback
|
||||||
|
*/
|
||||||
|
void
|
||||||
|
http_client_serve(struct http_client *c) {
|
||||||
|
|
||||||
|
event_set(&c->ev, c->fd, EV_READ, http_client_read, c);
|
||||||
|
event_base_set(c->s->base, &c->ev);
|
||||||
|
|
||||||
|
event_add(&c->ev, NULL);
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
http_on_path(http_parser *p, const char *at, size_t length) {
|
||||||
|
|
||||||
|
struct http_client *c = p->data;
|
||||||
|
|
||||||
|
c->path.s = at;
|
||||||
|
c->path.sz = length;
|
||||||
|
|
||||||
|
/* save HTTP verb as well */
|
||||||
|
c->verb = (enum http_method)p->method;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
http_on_body(http_parser *p, const char *at, size_t length) {
|
||||||
|
struct http_client *c = p->data;
|
||||||
|
|
||||||
|
c->body.s = at;
|
||||||
|
c->body.sz = length;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
@ -0,0 +1,52 @@
|
|||||||
|
#ifndef HTTP_H
|
||||||
|
#define HTTP_H
|
||||||
|
|
||||||
|
#include <event.h>
|
||||||
|
#include "http-parser/http_parser.h"
|
||||||
|
|
||||||
|
typedef struct {
|
||||||
|
const char *s;
|
||||||
|
size_t sz;
|
||||||
|
} str_t;
|
||||||
|
|
||||||
|
struct http_client {
|
||||||
|
|
||||||
|
/* socket and server reference */
|
||||||
|
int fd;
|
||||||
|
struct event ev;
|
||||||
|
struct server *s;
|
||||||
|
|
||||||
|
/* input buffer */
|
||||||
|
char *buffer;
|
||||||
|
size_t sz;
|
||||||
|
|
||||||
|
/* http parser */
|
||||||
|
http_parser_settings settings;
|
||||||
|
http_parser parser;
|
||||||
|
|
||||||
|
/* decoded http */
|
||||||
|
enum http_method verb;
|
||||||
|
|
||||||
|
str_t path;
|
||||||
|
str_t body;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct http_client *
|
||||||
|
http_client_new(int fd, struct server *s);
|
||||||
|
|
||||||
|
void
|
||||||
|
http_client_serve(struct http_client *c);
|
||||||
|
|
||||||
|
void
|
||||||
|
http_client_free(struct http_client *c);
|
||||||
|
|
||||||
|
int
|
||||||
|
http_on_path(http_parser*, const char *at, size_t length);
|
||||||
|
|
||||||
|
int
|
||||||
|
http_on_path(http_parser*, const char *at, size_t length);
|
||||||
|
|
||||||
|
int
|
||||||
|
http_on_body(http_parser*, const char *at, size_t length);
|
||||||
|
|
||||||
|
#endif
|
Loading…
Reference in New Issue