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http_parser.h
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12  *
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14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19  * IN THE SOFTWARE.
20  */
21 #ifndef http_parser_h
22 #define http_parser_h
23 #ifdef __cplusplus
24 extern "C" {
25 #endif
26 
27 /* Also update SONAME in the Makefile whenever you change these. */
28 #define HTTP_PARSER_VERSION_MAJOR 2
29 #define HTTP_PARSER_VERSION_MINOR 9
30 #define HTTP_PARSER_VERSION_PATCH 2
31 
32 #include <stddef.h>
33 #if defined(_WIN32) && !defined(__MINGW32__) && \
34  (!defined(_MSC_VER) || _MSC_VER<1600) && !defined(__WINE__)
35 #include <BaseTsd.h>
36 typedef __int8 int8_t;
37 typedef unsigned __int8 uint8_t;
38 typedef __int16 int16_t;
39 typedef unsigned __int16 uint16_t;
40 typedef __int32 int32_t;
41 typedef unsigned __int32 uint32_t;
42 typedef __int64 int64_t;
43 typedef unsigned __int64 uint64_t;
44 #else
45 #include <stdint.h>
46 #endif
47 
48 /* Compile with -DHTTP_PARSER_STRICT=0 to make less checks, but run
49  * faster
50  */
51 #ifndef HTTP_PARSER_STRICT
52 # define HTTP_PARSER_STRICT 1
53 #endif
54 
55 /* Maximium header size allowed. If the macro is not defined
56  * before including this header then the default is used. To
57  * change the maximum header size, define the macro in the build
58  * environment (e.g. -DHTTP_MAX_HEADER_SIZE=<value>). To remove
59  * the effective limit on the size of the header, define the macro
60  * to a very large number (e.g. -DHTTP_MAX_HEADER_SIZE=0x7fffffff)
61  */
62 #ifndef HTTP_MAX_HEADER_SIZE
63 # define HTTP_MAX_HEADER_SIZE (80*1024)
64 #endif
65 
66 typedef struct http_parser http_parser;
68 
69 
70 /* Callbacks should return non-zero to indicate an error. The parser will
71  * then halt execution.
72  *
73  * The one exception is on_headers_complete. In a HTTP_RESPONSE parser
74  * returning '1' from on_headers_complete will tell the parser that it
75  * should not expect a body. This is used when receiving a response to a
76  * HEAD request which may contain 'Content-Length' or 'Transfer-Encoding:
77  * chunked' headers that indicate the presence of a body.
78  *
79  * Returning `2` from on_headers_complete will tell parser that it should not
80  * expect neither a body nor any futher responses on this connection. This is
81  * useful for handling responses to a CONNECT request which may not contain
82  * `Upgrade` or `Connection: upgrade` headers.
83  *
84  * http_data_cb does not return data chunks. It will be called arbitrarily
85  * many times for each string. E.G. you might get 10 callbacks for "on_url"
86  * each providing just a few characters more data.
87  */
88 typedef int (*http_data_cb) (http_parser*, const char *at, size_t length);
89 typedef int (*http_cb) (http_parser*);
90 
91 
92 /* Status Codes */
93 #define HTTP_STATUS_MAP(XX) \
94  XX(100, CONTINUE, Continue) \
95  XX(101, SWITCHING_PROTOCOLS, Switching Protocols) \
96  XX(102, PROCESSING, Processing) \
97  XX(200, OK, OK) \
98  XX(201, CREATED, Created) \
99  XX(202, ACCEPTED, Accepted) \
100  XX(203, NON_AUTHORITATIVE_INFORMATION, Non-Authoritative Information) \
101  XX(204, NO_CONTENT, No Content) \
102  XX(205, RESET_CONTENT, Reset Content) \
103  XX(206, PARTIAL_CONTENT, Partial Content) \
104  XX(207, MULTI_STATUS, Multi-Status) \
105  XX(208, ALREADY_REPORTED, Already Reported) \
106  XX(226, IM_USED, IM Used) \
107  XX(300, MULTIPLE_CHOICES, Multiple Choices) \
108  XX(301, MOVED_PERMANENTLY, Moved Permanently) \
109  XX(302, FOUND, Found) \
110  XX(303, SEE_OTHER, See Other) \
111  XX(304, NOT_MODIFIED, Not Modified) \
112  XX(305, USE_PROXY, Use Proxy) \
113  XX(307, TEMPORARY_REDIRECT, Temporary Redirect) \
114  XX(308, PERMANENT_REDIRECT, Permanent Redirect) \
115  XX(400, BAD_REQUEST, Bad Request) \
116  XX(401, UNAUTHORIZED, Unauthorized) \
117  XX(402, PAYMENT_REQUIRED, Payment Required) \
118  XX(403, FORBIDDEN, Forbidden) \
119  XX(404, NOT_FOUND, Not Found) \
120  XX(405, METHOD_NOT_ALLOWED, Method Not Allowed) \
121  XX(406, NOT_ACCEPTABLE, Not Acceptable) \
122  XX(407, PROXY_AUTHENTICATION_REQUIRED, Proxy Authentication Required) \
123  XX(408, REQUEST_TIMEOUT, Request Timeout) \
124  XX(409, CONFLICT, Conflict) \
125  XX(410, GONE, Gone) \
126  XX(411, LENGTH_REQUIRED, Length Required) \
127  XX(412, PRECONDITION_FAILED, Precondition Failed) \
128  XX(413, PAYLOAD_TOO_LARGE, Payload Too Large) \
129  XX(414, URI_TOO_LONG, URI Too Long) \
130  XX(415, UNSUPPORTED_MEDIA_TYPE, Unsupported Media Type) \
131  XX(416, RANGE_NOT_SATISFIABLE, Range Not Satisfiable) \
132  XX(417, EXPECTATION_FAILED, Expectation Failed) \
133  XX(421, MISDIRECTED_REQUEST, Misdirected Request) \
134  XX(422, UNPROCESSABLE_ENTITY, Unprocessable Entity) \
135  XX(423, LOCKED, Locked) \
136  XX(424, FAILED_DEPENDENCY, Failed Dependency) \
137  XX(426, UPGRADE_REQUIRED, Upgrade Required) \
138  XX(428, PRECONDITION_REQUIRED, Precondition Required) \
139  XX(429, TOO_MANY_REQUESTS, Too Many Requests) \
140  XX(431, REQUEST_HEADER_FIELDS_TOO_LARGE, Request Header Fields Too Large) \
141  XX(451, UNAVAILABLE_FOR_LEGAL_REASONS, Unavailable For Legal Reasons) \
142  XX(500, INTERNAL_SERVER_ERROR, Internal Server Error) \
143  XX(501, NOT_IMPLEMENTED, Not Implemented) \
144  XX(502, BAD_GATEWAY, Bad Gateway) \
145  XX(503, SERVICE_UNAVAILABLE, Service Unavailable) \
146  XX(504, GATEWAY_TIMEOUT, Gateway Timeout) \
147  XX(505, HTTP_VERSION_NOT_SUPPORTED, HTTP Version Not Supported) \
148  XX(506, VARIANT_ALSO_NEGOTIATES, Variant Also Negotiates) \
149  XX(507, INSUFFICIENT_STORAGE, Insufficient Storage) \
150  XX(508, LOOP_DETECTED, Loop Detected) \
151  XX(510, NOT_EXTENDED, Not Extended) \
152  XX(511, NETWORK_AUTHENTICATION_REQUIRED, Network Authentication Required) \
153 
155  {
156 #define XX(num, name, string) HTTP_STATUS_##name = num,
158 #undef XX
159  };
160 
161 
162 /* Request Methods */
163 #define HTTP_METHOD_MAP(XX) \
164  XX(0, DELETE, DELETE) \
165  XX(1, GET, GET) \
166  XX(2, HEAD, HEAD) \
167  XX(3, POST, POST) \
168  XX(4, PUT, PUT) \
169  /* pathological */ \
170  XX(5, CONNECT, CONNECT) \
171  XX(6, OPTIONS, OPTIONS) \
172  XX(7, TRACE, TRACE) \
173  /* WebDAV */ \
174  XX(8, COPY, COPY) \
175  XX(9, LOCK, LOCK) \
176  XX(10, MKCOL, MKCOL) \
177  XX(11, MOVE, MOVE) \
178  XX(12, PROPFIND, PROPFIND) \
179  XX(13, PROPPATCH, PROPPATCH) \
180  XX(14, SEARCH, SEARCH) \
181  XX(15, UNLOCK, UNLOCK) \
182  XX(16, BIND, BIND) \
183  XX(17, REBIND, REBIND) \
184  XX(18, UNBIND, UNBIND) \
185  XX(19, ACL, ACL) \
186  /* subversion */ \
187  XX(20, REPORT, REPORT) \
188  XX(21, MKACTIVITY, MKACTIVITY) \
189  XX(22, CHECKOUT, CHECKOUT) \
190  XX(23, MERGE, MERGE) \
191  /* upnp */ \
192  XX(24, MSEARCH, M-SEARCH) \
193  XX(25, NOTIFY, NOTIFY) \
194  XX(26, SUBSCRIBE, SUBSCRIBE) \
195  XX(27, UNSUBSCRIBE, UNSUBSCRIBE) \
196  /* RFC-5789 */ \
197  XX(28, PATCH, PATCH) \
198  XX(29, PURGE, PURGE) \
199  /* CalDAV */ \
200  XX(30, MKCALENDAR, MKCALENDAR) \
201  /* RFC-2068, section 19.6.1.2 */ \
202  XX(31, LINK, LINK) \
203  XX(32, UNLINK, UNLINK) \
204  /* icecast */ \
205  XX(33, SOURCE, SOURCE) \
206 
208  {
209 #define XX(num, name, string) HTTP_##name = num,
211 #undef XX
212  };
213 
214 
216 
217 
218 /* Flag values for http_parser.flags field */
219 enum flags
220  { F_CHUNKED = 1 << 0
224  , F_TRAILING = 1 << 4
225  , F_UPGRADE = 1 << 5
226  , F_SKIPBODY = 1 << 6
227  , F_CONTENTLENGTH = 1 << 7
228  };
229 
230 
231 /* Map for errno-related constants
232  *
233  * The provided argument should be a macro that takes 2 arguments.
234  */
235 #define HTTP_ERRNO_MAP(XX) \
236  /* No error */ \
237  XX(OK, "success") \
238  \
239  /* Callback-related errors */ \
240  XX(CB_message_begin, "the on_message_begin callback failed") \
241  XX(CB_url, "the on_url callback failed") \
242  XX(CB_header_field, "the on_header_field callback failed") \
243  XX(CB_header_value, "the on_header_value callback failed") \
244  XX(CB_headers_complete, "the on_headers_complete callback failed") \
245  XX(CB_body, "the on_body callback failed") \
246  XX(CB_message_complete, "the on_message_complete callback failed") \
247  XX(CB_status, "the on_status callback failed") \
248  XX(CB_chunk_header, "the on_chunk_header callback failed") \
249  XX(CB_chunk_complete, "the on_chunk_complete callback failed") \
250  \
251  /* Parsing-related errors */ \
252  XX(INVALID_EOF_STATE, "stream ended at an unexpected time") \
253  XX(HEADER_OVERFLOW, \
254  "too many header bytes seen; overflow detected") \
255  XX(CLOSED_CONNECTION, \
256  "data received after completed connection: close message") \
257  XX(INVALID_VERSION, "invalid HTTP version") \
258  XX(INVALID_STATUS, "invalid HTTP status code") \
259  XX(INVALID_METHOD, "invalid HTTP method") \
260  XX(INVALID_URL, "invalid URL") \
261  XX(INVALID_HOST, "invalid host") \
262  XX(INVALID_PORT, "invalid port") \
263  XX(INVALID_PATH, "invalid path") \
264  XX(INVALID_QUERY_STRING, "invalid query string") \
265  XX(INVALID_FRAGMENT, "invalid fragment") \
266  XX(LF_EXPECTED, "LF character expected") \
267  XX(INVALID_HEADER_TOKEN, "invalid character in header") \
268  XX(INVALID_CONTENT_LENGTH, \
269  "invalid character in content-length header") \
270  XX(UNEXPECTED_CONTENT_LENGTH, \
271  "unexpected content-length header") \
272  XX(INVALID_CHUNK_SIZE, \
273  "invalid character in chunk size header") \
274  XX(INVALID_CONSTANT, "invalid constant string") \
275  XX(INVALID_INTERNAL_STATE, "encountered unexpected internal state")\
276  XX(STRICT, "strict mode assertion failed") \
277  XX(PAUSED, "parser is paused") \
278  XX(UNKNOWN, "an unknown error occurred")
279 
280 
281 /* Define HPE_* values for each errno value above */
282 #define HTTP_ERRNO_GEN(n, s) HPE_##n,
285 };
286 #undef HTTP_ERRNO_GEN
287 
288 
289 /* Get an http_errno value from an http_parser */
290 #define HTTP_PARSER_ERRNO(p) ((enum http_errno) (p)->http_errno)
291 
292 
293 struct http_parser {
295  unsigned int type : 2; /* enum http_parser_type */
296  unsigned int flags : 8; /* F_* values from 'flags' enum; semi-public */
297  unsigned int state : 7; /* enum state from http_parser.c */
298  unsigned int header_state : 7; /* enum header_state from http_parser.c */
299  unsigned int index : 7; /* index into current matcher */
300  unsigned int lenient_http_headers : 1;
301 
302  uint32_t nread; /* # bytes read in various scenarios */
303  uint64_t content_length; /* # bytes in body (0 if no Content-Length header) */
304 
306  unsigned short http_major;
307  unsigned short http_minor;
308  unsigned int status_code : 16; /* responses only */
309  unsigned int method : 8; /* requests only */
310  unsigned int http_errno : 7;
311 
312  /* 1 = Upgrade header was present and the parser has exited because of that.
313  * 0 = No upgrade header present.
314  * Should be checked when http_parser_execute() returns in addition to
315  * error checking.
316  */
317  unsigned int upgrade : 1;
318 
320  void *data; /* A pointer to get hook to the "connection" or "socket" object */
321 };
322 
323 
333  /* When on_chunk_header is called, the current chunk length is stored
334  * in parser->content_length.
335  */
338 };
339 
340 
342  { UF_SCHEMA = 0
343  , UF_HOST = 1
344  , UF_PORT = 2
345  , UF_PATH = 3
346  , UF_QUERY = 4
349  , UF_MAX = 7
350  };
351 
352 
353 /* Result structure for http_parser_parse_url().
354  *
355  * Callers should index into field_data[] with UF_* values iff field_set
356  * has the relevant (1 << UF_*) bit set. As a courtesy to clients (and
357  * because we probably have padding left over), we convert any port to
358  * a uint16_t.
359  */
361  uint16_t field_set; /* Bitmask of (1 << UF_*) values */
362  uint16_t port; /* Converted UF_PORT string */
363 
364  struct {
365  uint16_t off; /* Offset into buffer in which field starts */
366  uint16_t len; /* Length of run in buffer */
368 };
369 
370 
371 /* Returns the library version. Bits 16-23 contain the major version number,
372  * bits 8-15 the minor version number and bits 0-7 the patch level.
373  * Usage example:
374  *
375  * unsigned long version = http_parser_version();
376  * unsigned major = (version >> 16) & 255;
377  * unsigned minor = (version >> 8) & 255;
378  * unsigned patch = version & 255;
379  * printf("http_parser v%u.%u.%u\n", major, minor, patch);
380  */
381 unsigned long http_parser_version(void);
382 
383 void http_parser_init(http_parser *parser, enum http_parser_type type);
384 
385 
386 /* Initialize http_parser_settings members to 0
387  */
389 
390 
391 /* Executes the parser. Returns number of parsed bytes. Sets
392  * `parser->http_errno` on error. */
393 size_t http_parser_execute(http_parser *parser,
394  const http_parser_settings *settings,
395  const char *data,
396  size_t len);
397 
398 
399 /* If http_should_keep_alive() in the on_headers_complete or
400  * on_message_complete callback returns 0, then this should be
401  * the last message on the connection.
402  * If you are the server, respond with the "Connection: close" header.
403  * If you are the client, close the connection.
404  */
405 int http_should_keep_alive(const http_parser *parser);
406 
407 /* Returns a string version of the HTTP method. */
408 const char *http_method_str(enum http_method m);
409 
410 /* Returns a string version of the HTTP status code. */
411 const char *http_status_str(enum http_status s);
412 
413 /* Return a string name of the given error */
414 const char *http_errno_name(enum http_errno err);
415 
416 /* Return a string description of the given error */
417 const char *http_errno_description(enum http_errno err);
418 
419 /* Initialize all http_parser_url members to 0 */
420 void http_parser_url_init(struct http_parser_url *u);
421 
422 /* Parse a URL; return nonzero on failure */
423 int http_parser_parse_url(const char *buf, size_t buflen,
424  int is_connect,
425  struct http_parser_url *u);
426 
427 /* Pause or un-pause the parser; a nonzero value pauses */
428 void http_parser_pause(http_parser *parser, int paused);
429 
430 /* Checks if this is the final chunk of the body. */
431 int http_body_is_final(const http_parser *parser);
432 
433 /* Change the maximum header size provided at compile time. */
434 void http_parser_set_max_header_size(uint32_t size);
435 
436 #ifdef __cplusplus
437 }
438 #endif
439 #endif
#define XX(num, name, string)
Definition: http_parser.h:209
void http_parser_settings_init(http_parser_settings *settings)
Definition: http_parser.cpp:2159
#define HTTP_METHOD_MAP(XX)
Definition: http_parser.h:163
void http_parser_init(http_parser *parser, enum http_parser_type type)
Definition: http_parser.cpp:2148
http_errno
Definition: http_parser.h:283
unsigned long http_parser_version(void)
Definition: http_parser.cpp:2489
size_t http_parser_execute(http_parser *parser, const http_parser_settings *settings, const char *data, size_t len)
Definition: http_parser.cpp:638
#define HTTP_ERRNO_MAP(XX)
Definition: http_parser.h:235
void http_parser_url_init(struct http_parser_url *u)
Definition: http_parser.cpp:2341
const char * http_status_str(enum http_status s)
Definition: http_parser.cpp:2137
#define HTTP_ERRNO_GEN(n, s)
Definition: http_parser.h:282
const char * http_errno_description(enum http_errno err)
Definition: http_parser.cpp:2171
int(* http_data_cb)(http_parser *, const char *at, size_t length)
Definition: http_parser.h:88
const char * http_errno_name(enum http_errno err)
Definition: http_parser.cpp:2165
http_parser_url_fields
Definition: http_parser.h:342
@ UF_FRAGMENT
Definition: http_parser.h:347
@ UF_PORT
Definition: http_parser.h:344
@ UF_MAX
Definition: http_parser.h:349
@ UF_PATH
Definition: http_parser.h:345
@ UF_SCHEMA
Definition: http_parser.h:342
@ UF_QUERY
Definition: http_parser.h:346
@ UF_USERINFO
Definition: http_parser.h:348
@ UF_HOST
Definition: http_parser.h:343
int(* http_cb)(http_parser *)
Definition: http_parser.h:89
http_method
Definition: http_parser.h:208
void http_parser_pause(http_parser *parser, int paused)
Definition: http_parser.cpp:2469
flags
Definition: http_parser.h:220
@ F_CHUNKED
Definition: http_parser.h:220
@ F_CONNECTION_CLOSE
Definition: http_parser.h:222
@ F_CONNECTION_KEEP_ALIVE
Definition: http_parser.h:221
@ F_UPGRADE
Definition: http_parser.h:225
@ F_CONTENTLENGTH
Definition: http_parser.h:227
@ F_TRAILING
Definition: http_parser.h:224
@ F_SKIPBODY
Definition: http_parser.h:226
@ F_CONNECTION_UPGRADE
Definition: http_parser.h:223
http_status
Definition: http_parser.h:155
int http_should_keep_alive(const http_parser *parser)
Definition: http_parser.cpp:2112
void http_parser_set_max_header_size(uint32_t size)
Definition: http_parser.cpp:2496
#define HTTP_STATUS_MAP(XX)
Definition: http_parser.h:93
const char * http_method_str(enum http_method m)
Definition: http_parser.cpp:2131
int http_parser_parse_url(const char *buf, size_t buflen, int is_connect, struct http_parser_url *u)
Definition: http_parser.cpp:2346
int http_body_is_final(const http_parser *parser)
http_parser_type
Definition: http_parser.h:215
@ HTTP_RESPONSE
Definition: http_parser.h:215
@ HTTP_REQUEST
Definition: http_parser.h:215
@ HTTP_BOTH
Definition: http_parser.h:215
Definition: http_parser.h:324
http_data_cb on_header_value
Definition: http_parser.h:329
http_cb on_chunk_header
Definition: http_parser.h:336
http_data_cb on_status
Definition: http_parser.h:327
http_cb on_headers_complete
Definition: http_parser.h:330
http_data_cb on_url
Definition: http_parser.h:326
http_data_cb on_body
Definition: http_parser.h:331
http_cb on_chunk_complete
Definition: http_parser.h:337
http_cb on_message_begin
Definition: http_parser.h:325
http_data_cb on_header_field
Definition: http_parser.h:328
http_cb on_message_complete
Definition: http_parser.h:332
Definition: http_parser.h:360
struct http_parser_url::@1 field_data[UF_MAX]
uint16_t len
Definition: http_parser.h:366
uint16_t off
Definition: http_parser.h:365
uint16_t field_set
Definition: http_parser.h:361
uint16_t port
Definition: http_parser.h:362
Definition: http_parser.h:293
unsigned int flags
Definition: http_parser.h:296
unsigned int state
Definition: http_parser.h:297
unsigned int index
Definition: http_parser.h:299
unsigned int upgrade
Definition: http_parser.h:317
uint32_t nread
Definition: http_parser.h:302
unsigned int method
Definition: http_parser.h:309
void * data
Definition: http_parser.h:320
uint64_t content_length
Definition: http_parser.h:303
unsigned int status_code
Definition: http_parser.h:308
unsigned int http_errno
Definition: http_parser.h:310
unsigned int header_state
Definition: http_parser.h:298
unsigned int type
Definition: http_parser.h:295
unsigned short http_major
Definition: http_parser.h:306
unsigned int lenient_http_headers
Definition: http_parser.h:300
unsigned short http_minor
Definition: http_parser.h:307