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libmicrohttpd/src/include/microhttpd.h
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Christian Grothoff 761267757c ready for 0.9.0
2010-07-26 16:57:47 +00:00

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/*
This file is part of libmicrohttpd
(C) 2006, 2007, 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file microhttpd.h
* @brief public interface to libmicrohttpd
* @author Christian Grothoff
* @author Chris GauthierDickey
*
* All symbols defined in this header start with MHD. MHD is a small
* HTTP daemon library. As such, it does not have any API for logging
* errors (you can only enable or disable logging to stderr). Also,
* it may not support all of the HTTP features directly, where
* applicable, portions of HTTP may have to be handled by clients of
* the library.<p>
*
* The library is supposed to handle everything that it must handle
* (because the API would not allow clients to do this), such as basic
* connection management; however, detailed interpretations of headers
* -- such as range requests -- and HTTP methods are left to clients.
* The library does understand HEAD and will only send the headers of
* the response and not the body, even if the client supplied a body.
* The library also understands headers that control connection
* management (specifically, "Connection: close" and "Expect: 100
* continue" are understood and handled automatically).<p>
*
* MHD understands POST data and is able to decode certain formats
* (at the moment only "application/x-www-form-urlencoded" and
* "mulitpart/formdata"). Unsupported encodings and large POST
* submissions may require the application to manually process
* the stream, which is provided to the main application (and thus can be
* processed, just not conveniently by MHD).<p>
*
* The header file defines various constants used by the HTTP protocol.
* This does not mean that MHD actually interprets all of these
* values. The provided constants are exported as a convenience
* for users of the library. MHD does not verify that transmitted
* HTTP headers are part of the standard specification; users of the
* library are free to define their own extensions of the HTTP
* standard and use those with MHD.<p>
*
* All functions are guaranteed to be completely reentrant and
* thread-safe (with the exception of 'MHD_set_connection_value',
* which must only be used in a particular context).<p>
*
* NEW: Before including "microhttpd.h" you should add the necessary
* includes to define the "uint64_t", "size_t", "fd_set", "socklen_t"
* and "struct sockaddr" data types (which headers are needed may
* depend on your platform; for possible suggestions consult
* "platform.h" in the MHD distribution).
*
*/
#ifndef MHD_MICROHTTPD_H
#define MHD_MICROHTTPD_H
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Current version of the library.
*/
#define MHD_VERSION 0x00090000
/**
* MHD-internal return code for "YES".
*/
#define MHD_YES 1
/**
* MHD-internal return code for "NO".
*/
#define MHD_NO 0
/**
* Constant used to indicate unknown size (use when
* creating a response).
*/
#ifdef UINT64_MAX
#define MHD_SIZE_UNKNOWN UINT64_MAX
#else
#define MHD_SIZE_UNKNOWN ((uint64_t) -1LL)
#endif
/**
* HTTP response codes.
*/
#define MHD_HTTP_CONTINUE 100
#define MHD_HTTP_SWITCHING_PROTOCOLS 101
#define MHD_HTTP_PROCESSING 102
#define MHD_HTTP_OK 200
#define MHD_HTTP_CREATED 201
#define MHD_HTTP_ACCEPTED 202
#define MHD_HTTP_NON_AUTHORITATIVE_INFORMATION 203
#define MHD_HTTP_NO_CONTENT 204
#define MHD_HTTP_RESET_CONTENT 205
#define MHD_HTTP_PARTIAL_CONTENT 206
#define MHD_HTTP_MULTI_STATUS 207
#define MHD_HTTP_MULTIPLE_CHOICES 300
#define MHD_HTTP_MOVED_PERMANENTLY 301
#define MHD_HTTP_FOUND 302
#define MHD_HTTP_SEE_OTHER 303
#define MHD_HTTP_NOT_MODIFIED 304
#define MHD_HTTP_USE_PROXY 305
#define MHD_HTTP_SWITCH_PROXY 306
#define MHD_HTTP_TEMPORARY_REDIRECT 307
#define MHD_HTTP_BAD_REQUEST 400
#define MHD_HTTP_UNAUTHORIZED 401
#define MHD_HTTP_PAYMENT_REQUIRED 402
#define MHD_HTTP_FORBIDDEN 403
#define MHD_HTTP_NOT_FOUND 404
#define MHD_HTTP_METHOD_NOT_ALLOWED 405
#define MHD_HTTP_METHOD_NOT_ACCEPTABLE 406
#define MHD_HTTP_PROXY_AUTHENTICATION_REQUIRED 407
#define MHD_HTTP_REQUEST_TIMEOUT 408
#define MHD_HTTP_CONFLICT 409
#define MHD_HTTP_GONE 410
#define MHD_HTTP_LENGTH_REQUIRED 411
#define MHD_HTTP_PRECONDITION_FAILED 412
#define MHD_HTTP_REQUEST_ENTITY_TOO_LARGE 413
#define MHD_HTTP_REQUEST_URI_TOO_LONG 414
#define MHD_HTTP_UNSUPPORTED_MEDIA_TYPE 415
#define MHD_HTTP_REQUESTED_RANGE_NOT_SATISFIABLE 416
#define MHD_HTTP_EXPECTATION_FAILED 417
#define MHD_HTTP_UNPROCESSABLE_ENTITY 422
#define MHD_HTTP_LOCKED 423
#define MHD_HTTP_FAILED_DEPENDENCY 424
#define MHD_HTTP_UNORDERED_COLLECTION 425
#define MHD_HTTP_UPGRADE_REQUIRED 426
#define MHD_HTTP_RETRY_WITH 449
#define MHD_HTTP_INTERNAL_SERVER_ERROR 500
#define MHD_HTTP_NOT_IMPLEMENTED 501
#define MHD_HTTP_BAD_GATEWAY 502
#define MHD_HTTP_SERVICE_UNAVAILABLE 503
#define MHD_HTTP_GATEWAY_TIMEOUT 504
#define MHD_HTTP_HTTP_VERSION_NOT_SUPPORTED 505
#define MHD_HTTP_VARIANT_ALSO_NEGOTIATES 506
#define MHD_HTTP_INSUFFICIENT_STORAGE 507
#define MHD_HTTP_BANDWIDTH_LIMIT_EXCEEDED 509
#define MHD_HTTP_NOT_EXTENDED 510
/* See also: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html */
#define MHD_HTTP_HEADER_ACCEPT "Accept"
#define MHD_HTTP_HEADER_ACCEPT_CHARSET "Accept-Charset"
#define MHD_HTTP_HEADER_ACCEPT_ENCODING "Accept-Encoding"
#define MHD_HTTP_HEADER_ACCEPT_LANGUAGE "Accept-Language"
#define MHD_HTTP_HEADER_ACCEPT_RANGES "Accept-Ranges"
#define MHD_HTTP_HEADER_AGE "Age"
#define MHD_HTTP_HEADER_ALLOW "Allow"
#define MHD_HTTP_HEADER_AUTHORIZATION "Authorization"
#define MHD_HTTP_HEADER_CACHE_CONTROL "Cache-Control"
#define MHD_HTTP_HEADER_CONNECTION "Connection"
#define MHD_HTTP_HEADER_CONTENT_ENCODING "Content-Encoding"
#define MHD_HTTP_HEADER_CONTENT_LANGUAGE "Content-Language"
#define MHD_HTTP_HEADER_CONTENT_LENGTH "Content-Length"
#define MHD_HTTP_HEADER_CONTENT_LOCATION "Content-Location"
#define MHD_HTTP_HEADER_CONTENT_MD5 "Content-MD5"
#define MHD_HTTP_HEADER_CONTENT_RANGE "Content-Range"
#define MHD_HTTP_HEADER_CONTENT_TYPE "Content-Type"
#define MHD_HTTP_HEADER_COOKIE "Cookie"
#define MHD_HTTP_HEADER_DATE "Date"
#define MHD_HTTP_HEADER_ETAG "ETag"
#define MHD_HTTP_HEADER_EXPECT "Expect"
#define MHD_HTTP_HEADER_EXPIRES "Expires"
#define MHD_HTTP_HEADER_FROM "From"
#define MHD_HTTP_HEADER_HOST "Host"
#define MHD_HTTP_HEADER_IF_MATCH "If-Match"
#define MHD_HTTP_HEADER_IF_MODIFIED_SINCE "If-Modified-Since"
#define MHD_HTTP_HEADER_IF_NONE_MATCH "If-None-Match"
#define MHD_HTTP_HEADER_IF_RANGE "If-Range"
#define MHD_HTTP_HEADER_IF_UNMODIFIED_SINCE "If-Unmodified-Since"
#define MHD_HTTP_HEADER_LAST_MODIFIED "Last-Modified"
#define MHD_HTTP_HEADER_LOCATION "Location"
#define MHD_HTTP_HEADER_MAX_FORWARDS "Max-Forwards"
#define MHD_HTTP_HEADER_PRAGMA "Pragma"
#define MHD_HTTP_HEADER_PROXY_AUTHENTICATE "Proxy-Authenticate"
#define MHD_HTTP_HEADER_PROXY_AUTHORIZATION "Proxy-Authorization"
#define MHD_HTTP_HEADER_RANGE "Range"
#define MHD_HTTP_HEADER_REFERER "Referer"
#define MHD_HTTP_HEADER_RETRY_AFTER "Retry-After"
#define MHD_HTTP_HEADER_SERVER "Server"
#define MHD_HTTP_HEADER_SET_COOKIE "Set-Cookie"
#define MHD_HTTP_HEADER_SET_COOKIE2 "Set-Cookie2"
#define MHD_HTTP_HEADER_TE "TE"
#define MHD_HTTP_HEADER_TRAILER "Trailer"
#define MHD_HTTP_HEADER_TRANSFER_ENCODING "Transfer-Encoding"
#define MHD_HTTP_HEADER_UPGRADE "Upgrade"
#define MHD_HTTP_HEADER_USER_AGENT "User-Agent"
#define MHD_HTTP_HEADER_VARY "Vary"
#define MHD_HTTP_HEADER_VIA "Via"
#define MHD_HTTP_HEADER_WARNING "Warning"
#define MHD_HTTP_HEADER_WWW_AUTHENTICATE "WWW-Authenticate"
/**
* HTTP versions (used to match against the first line of the
* HTTP header as well as in the response code).
*/
#define MHD_HTTP_VERSION_1_0 "HTTP/1.0"
#define MHD_HTTP_VERSION_1_1 "HTTP/1.1"
/**
* HTTP methods
*/
#define MHD_HTTP_METHOD_CONNECT "CONNECT"
#define MHD_HTTP_METHOD_DELETE "DELETE"
#define MHD_HTTP_METHOD_GET "GET"
#define MHD_HTTP_METHOD_HEAD "HEAD"
#define MHD_HTTP_METHOD_OPTIONS "OPTIONS"
#define MHD_HTTP_METHOD_POST "POST"
#define MHD_HTTP_METHOD_PUT "PUT"
#define MHD_HTTP_METHOD_TRACE "TRACE"
/**
* HTTP POST encodings, see also
* http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4
*/
#define MHD_HTTP_POST_ENCODING_FORM_URLENCODED "application/x-www-form-urlencoded"
#define MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA "multipart/form-data"
/**
* Options for the MHD daemon. Note that if neither
* MHD_USER_THREAD_PER_CONNECTION nor MHD_USE_SELECT_INTERNALLY are
* used, the client wants control over the process and will call the
* appropriate microhttpd callbacks.<p>
*
* Starting the daemon may also fail if a particular option is not
* implemented or not supported on the target platform (i.e. no
* support for SSL, threads or IPv6).
*/
enum MHD_FLAG
{
/**
* No options selected.
*/
MHD_NO_FLAG = 0,
/**
* Run in debug mode. If this flag is used, the
* library should print error messages and warnings
* to stderr.
*/
MHD_USE_DEBUG = 1,
/**
* Run in https mode.
*/
MHD_USE_SSL = 2,
/**
* Run using one thread per connection.
*/
MHD_USE_THREAD_PER_CONNECTION = 4,
/**
* Run using an internal thread doing SELECT.
*/
MHD_USE_SELECT_INTERNALLY = 8,
/**
* Run using the IPv6 protocol (otherwise, MHD will
* just support IPv4).
*/
MHD_USE_IPv6 = 16,
/**
* Be pedantic about the protocol (as opposed to as tolerant as
* possible). Specifically, at the moment, this flag causes MHD to
* reject http 1.1 connections without a "Host" header. This is
* required by the standard, but of course in violation of the "be
* as liberal as possible in what you accept" norm. It is
* recommended to turn this ON if you are testing clients against
* MHD, and OFF in production.
*/
MHD_USE_PEDANTIC_CHECKS = 32,
/**
* Use poll instead of select. This allows sockets with fd >= FD_SETSIZE.
* This option only works in conjunction with MHD_USE_THREAD_PER_CONNECTION
* (at this point).
*/
MHD_USE_POLL = 64
};
/**
* MHD options. Passed in the varargs portion
* of MHD_start_daemon.
*/
enum MHD_OPTION
{
/**
* No more options / last option. This is used
* to terminate the VARARGs list.
*/
MHD_OPTION_END = 0,
/**
* Maximum memory size per connection (followed by a
* size_t).
*/
MHD_OPTION_CONNECTION_MEMORY_LIMIT = 1,
/**
* Maximum number of concurrent connections to
* accept (followed by an unsigned int).
*/
MHD_OPTION_CONNECTION_LIMIT = 2,
/**
* After how many seconds of inactivity should a
* connection automatically be timed out? (followed
* by an unsigned int; use zero for no timeout).
*/
MHD_OPTION_CONNECTION_TIMEOUT = 3,
/**
* Register a function that should be called whenever a request has
* been completed (this can be used for application-specific clean
* up). Requests that have never been presented to the application
* (via MHD_AccessHandlerCallback) will not result in
* notifications.<p>
*
* This option should be followed by TWO pointers. First a pointer
* to a function of type "MHD_RequestCompletedCallback" and second a
* pointer to a closure to pass to the request completed callback.
* The second pointer maybe NULL.
*/
MHD_OPTION_NOTIFY_COMPLETED = 4,
/**
* Limit on the number of (concurrent) connections made to the
* server from the same IP address. Can be used to prevent one
* IP from taking over all of the allowed connections. If the
* same IP tries to establish more than the specified number of
* connections, they will be immediately rejected. The option
* should be followed by an "unsigned int". The default is
* zero, which means no limit on the number of connections
* from the same IP address.
*/
MHD_OPTION_PER_IP_CONNECTION_LIMIT = 5,
/**
* Bind daemon to the supplied sockaddr. this option should be followed by a
* 'struct sockaddr *'. If 'MHD_USE_IPv6' is specified, the 'struct sockaddr*'
* should point to a 'struct sockaddr_in6', otherwise to a 'struct sockaddr_in'.
*/
MHD_OPTION_SOCK_ADDR = 6,
/**
* Specify a function that should be called before parsing the URI from
* the client. The specified callback function can be used for processing
* the URI (including the options) before it is parsed. The URI after
* parsing will no longer contain the options, which maybe inconvenient for
* logging. This option should be followed by two arguments, the first
* one must be of the form
* <pre>
* void * my_logger(void * cls, const char * uri)
* </pre>
* where the return value will be passed as
* (*con_cls) in calls to the MHD_AccessHandlerCallback
* when this request is processed later; returning a
* value of NULL has no special significance (however,
* note that if you return non-NULL, you can no longer
* rely on the first call to the access handler having
* NULL == *con_cls on entry;)
* "cls" will be set to the second argument following
* MHD_OPTION_URI_LOG_CALLBACK. Finally, uri will
* be the 0-terminated URI of the request.
*/
MHD_OPTION_URI_LOG_CALLBACK = 7,
/**
* Memory pointer for the private key (key.pem) to be used by the
* HTTPS daemon. This option should be followed by an
* "const char*" argument.
* This should be used in conjunction with 'MHD_OPTION_HTTPS_MEM_CERT'.
*/
MHD_OPTION_HTTPS_MEM_KEY = 8,
/**
* Memory pointer for the certificate (cert.pem) to be used by the
* HTTPS daemon. This option should be followed by an
* "const char*" argument.
* This should be used in conjunction with 'MHD_OPTION_HTTPS_MEM_KEY'.
*/
MHD_OPTION_HTTPS_MEM_CERT = 9,
/**
* Daemon credentials type.
* Followed by an argument of type
* "gnutls_credentials_type_t".
*/
MHD_OPTION_HTTPS_CRED_TYPE = 10,
/**
* Memory pointer to a "const char*" specifying the
* cipher algorithm (default: "NORMAL").
*/
MHD_OPTION_HTTPS_PRIORITIES = 11,
/**
* Pass a listen socket for MHD to use (systemd-style). If this
* option is used, MHD will not open its own listen socket(s). The
* argument passed must be of type "int" and refer to an
* existing socket that has been bound to a port and is listening.
*/
MHD_OPTION_LISTEN_SOCKET = 12,
/**
* Use the given function for logging error messages.
* This option must be followed by two arguments; the
* first must be a pointer to a function
* of type "void fun(void * arg, const char * fmt, va_list ap)"
* and the second a pointer "void*" which will
* be passed as the "arg" argument to "fun".
* <p>
* Note that MHD will not generate any log messages
* if it was compiled without the "--enable-messages"
* flag being set.
*/
MHD_OPTION_EXTERNAL_LOGGER = 13,
/**
* Number (unsigned int) of threads in thread pool. Enable
* thread pooling by setting this value to to something
* greater than 1. Currently, thread model must be
* MHD_USE_SELECT_INTERNALLY if thread pooling is enabled
* (MHD_start_daemon returns NULL for an unsupported thread
* model).
*/
MHD_OPTION_THREAD_POOL_SIZE = 14,
/**
* Additional options given in an array of "struct MHD_OptionItem".
* The array must be terminated with an entry '{MHD_OPTION_END, 0, NULL}'.
* An example for code using MHD_OPTION_ARRAY is:
* <code>
* struct MHD_OptionItem ops[] = {
* { MHD_OPTION_CONNECTION_LIMIT, 100, NULL },
* { MHD_OPTION_CONNECTION_TIMEOUT, 10, NULL },
* { MHD_OPTION_END, 0, NULL }
* };
* d = MHD_start_daemon(0, 8080, NULL, NULL, dh, NULL,
* MHD_OPTION_ARRAY, ops,
* MHD_OPTION_END);
* </code>
* For options that expect a single pointer argument, the
* second member of the struct MHD_OptionItem is ignored.
* For options that expect two pointer arguments, the first
* argument must be cast to 'intptr_t'.
*/
MHD_OPTION_ARRAY = 15
};
/**
* Entry in an MHD_OPTION_ARRAY.
*/
struct MHD_OptionItem
{
/**
* Which option is being given. Use MHD_OPTION_END
* to terminate the array.
*/
enum MHD_OPTION option;
/**
* Option value (for integer arguments, and for options requiring
* two pointer arguments); should be 0 for options that take no
* arguments or only a single pointer argument.
*/
intptr_t value;
/**
* Pointer option value (use NULL for options taking no arguments
* or only an integer option).
*/
void *ptr_value;
};
/**
* The MHD_ValueKind specifies the source of
* the key-value pairs in the HTTP protocol.
*/
enum MHD_ValueKind
{
/**
* Response header
*/
MHD_RESPONSE_HEADER_KIND = 0,
/**
* HTTP header.
*/
MHD_HEADER_KIND = 1,
/**
* Cookies. Note that the original HTTP header containing
* the cookie(s) will still be available and intact.
*/
MHD_COOKIE_KIND = 2,
/**
* POST data. This is available only if a content encoding
* supported by MHD is used (currently only URL encoding),
* and only if the posted content fits within the available
* memory pool. Note that in that case, the upload data
* given to the MHD_AccessHandlerCallback will be
* empty (since it has already been processed).
*/
MHD_POSTDATA_KIND = 4,
/**
* GET (URI) arguments.
*/
MHD_GET_ARGUMENT_KIND = 8,
/**
* HTTP footer (only for http 1.1 chunked encodings).
*/
MHD_FOOTER_KIND = 16
};
/**
* The MHD_RequestTerminationCode specifies reasons
* why a request has been terminated (or completed).
*/
enum MHD_RequestTerminationCode
{
/**
* We finished sending the response.
*/
MHD_REQUEST_TERMINATED_COMPLETED_OK = 0,
/**
* Error handling the connection (resources
* exhausted, other side closed connection,
* application error accepting request, etc.)
*/
MHD_REQUEST_TERMINATED_WITH_ERROR = 1,
/**
* No activity on the connection for the number
* of seconds specified using
* MHD_OPTION_CONNECTION_TIMEOUT.
*/
MHD_REQUEST_TERMINATED_TIMEOUT_REACHED = 2,
/**
* We had to close the session since MHD was being
* shut down.
*/
MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN = 3
};
/**
* Values of this enum are used to specify what
* information about a connection is desired.
*/
enum MHD_ConnectionInfoType
{
/**
* What cipher algorithm is being used.
* Takes no extra arguments.
*/
MHD_CONNECTION_INFO_CIPHER_ALGO,
/**
*
* Takes no extra arguments.
*/
MHD_CONNECTION_INFO_PROTOCOL,
/**
* Obtain IP address of the client.
* Takes no extra arguments.
*/
MHD_CONNECTION_INFO_CLIENT_ADDRESS,
/**
* Get the GNUTLS session handle.
*/
MHD_CONNECTION_INFO_GNUTLS_SESSION
};
/**
* Values of this enum are used to specify what
* information about a deamon is desired.
*/
enum MHD_DaemonInfoType
{
/**
* Request information about the key size for
* a particular cipher algorithm. The cipher
* algorithm should be passed as an extra
* argument (of type 'enum MHD_GNUTLS_CipherAlgorithm').
*/
MHD_DAEMON_INFO_KEY_SIZE,
/**
* Request information about the key size for
* a particular cipher algorithm. The cipher
* algorithm should be passed as an extra
* argument (of type 'enum MHD_GNUTLS_HashAlgorithm').
*/
MHD_DAEMON_INFO_MAC_KEY_SIZE,
/**
* Request the file descriptor for the listening socket.
* No extra arguments should be passed.
*/
MHD_DAEMON_INFO_LISTEN_FD
};
/**
* Handle for the daemon (listening on a socket for HTTP traffic).
*/
struct MHD_Daemon;
/**
* Handle for a connection / HTTP request. With HTTP/1.1, multiple
* requests can be run over the same connection. However, MHD will
* only show one request per TCP connection to the client at any given
* time.
*/
struct MHD_Connection;
/**
* Handle for a response.
*/
struct MHD_Response;
/**
* Handle for POST processing.
*/
struct MHD_PostProcessor;
/**
* Callback for serious error condition. The default action is to abort().
* @param cls user specified value
* @param file where the error occured
* @param line where the error occured
* @param reason error detail, may be NULL
*/
typedef void (*MHD_PanicCallback) (void *cls,
const char *file,
unsigned int line,
const char *reason);
/**
* Allow or deny a client to connect.
*
* @param addr address information from the client
* @param addrlen length of the address information
* @return MHD_YES if connection is allowed, MHD_NO if not
*/
typedef int
(*MHD_AcceptPolicyCallback) (void *cls,
const struct sockaddr * addr,
socklen_t addrlen);
/**
* A client has requested the given url using the given method ("GET",
* "PUT", "DELETE", "POST", etc). The callback must call MHS
* callbacks to provide content to give back to the client and return
* an HTTP status code (i.e. 200 for OK, 404, etc.).
*
* @param cls argument given together with the function
* pointer when the handler was registered with MHD
* @param url the requested url
* @param method the HTTP method used ("GET", "PUT", etc.)
* @param version the HTTP version string (i.e. "HTTP/1.1")
* @param upload_data the data being uploaded (excluding HEADERS,
* for a POST that fits into memory and that is encoded
* with a supported encoding, the POST data will NOT be
* given in upload_data and is instead available as
* part of MHD_get_connection_values; very large POST
* data *will* be made available incrementally in
* upload_data)
* @param upload_data_size set initially to the size of the
* upload_data provided; the method must update this
* value to the number of bytes NOT processed;
* @param con_cls pointer that the callback can set to some
* address and that will be preserved by MHD for future
* calls for this request; since the access handler may
* be called many times (i.e., for a PUT/POST operation
* with plenty of upload data) this allows the application
* to easily associate some request-specific state.
* If necessary, this state can be cleaned up in the
* global "MHD_RequestCompleted" callback (which
* can be set with the MHD_OPTION_NOTIFY_COMPLETED).
* Initially, <tt>*con_cls</tt> will be NULL.
* @return MHS_YES if the connection was handled successfully,
* MHS_NO if the socket must be closed due to a serios
* error while handling the request
*/
typedef int
(*MHD_AccessHandlerCallback) (void *cls,
struct MHD_Connection * connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **con_cls);
/**
* Signature of the callback used by MHD to notify the
* application about completed requests.
*
* @param cls client-defined closure
* @param connection connection handle
* @param con_cls value as set by the last call to
* the MHD_AccessHandlerCallback
* @param toe reason for request termination
* @see MHD_OPTION_NOTIFY_COMPLETED
*/
typedef void
(*MHD_RequestCompletedCallback) (void *cls,
struct MHD_Connection * connection,
void **con_cls,
enum MHD_RequestTerminationCode toe);
/**
* Iterator over key-value pairs. This iterator
* can be used to iterate over all of the cookies,
* headers, or POST-data fields of a request, and
* also to iterate over the headers that have been
* added to a response.
*
* @return MHD_YES to continue iterating,
* MHD_NO to abort the iteration
*/
typedef int
(*MHD_KeyValueIterator) (void *cls,
enum MHD_ValueKind kind,
const char *key, const char *value);
/**
* Callback used by libmicrohttpd in order to obtain content. The
* callback is to copy at most "max" bytes of content into "buf". The
* total number of bytes that has been placed into "buf" should be
* returned.<p>
*
* Note that returning zero will cause libmicrohttpd to try again,
* either "immediately" if in multi-threaded mode (in which case the
* callback may want to do blocking operations) or in the next round
* if MHD_run is used. Returning 0 for a daemon that runs in internal
* select mode is an error (since it would result in busy waiting) and
* will cause the program to be aborted (abort()).
*
* @param cls extra argument to the callback
* @param pos position in the datastream to access;
* note that if an MHD_Response object is re-used,
* it is possible for the same content reader to
* be queried multiple times for the same data;
* however, if an MHD_Response is not re-used,
* libmicrohttpd guarantees that "pos" will be
* the sum of all non-negative return values
* obtained from the content reader so far.
* @return -1 for the end of transmission (or on error);
* if a content transfer size was pre-set and the callback
* has provided fewer than that amount of data,
* MHD will close the connection with the client;
* if no content size was specified and this is an
* http 1.1 connection using chunked encoding, MHD will
* interpret "-1" as the normal end of the transfer
* (possibly allowing the client to perform additional
* requests using the same TCP connection).
*/
typedef int
(*MHD_ContentReaderCallback) (void *cls,
uint64_t pos,
char *buf,
int max);
/**
* This method is called by libmicrohttpd if we
* are done with a content reader. It should
* be used to free resources associated with the
* content reader.
*/
typedef void (*MHD_ContentReaderFreeCallback) (void *cls);
/**
* Iterator over key-value pairs where the value
* maybe made available in increments and/or may
* not be zero-terminated. Used for processing
* POST data.
*
* @param cls user-specified closure
* @param kind type of the value
* @param key 0-terminated key for the value
* @param filename name of the uploaded file, NULL if not known
* @param content_type mime-type of the data, NULL if not known
* @param transfer_encoding encoding of the data, NULL if not known
* @param data pointer to size bytes of data at the
* specified offset
* @param off offset of data in the overall value
* @param size number of bytes in data available
* @return MHD_YES to continue iterating,
* MHD_NO to abort the iteration
*/
typedef int
(*MHD_PostDataIterator) (void *cls,
enum MHD_ValueKind kind,
const char *key,
const char *filename,
const char *content_type,
const char *transfer_encoding,
const char *data, uint64_t off, size_t size);
/* **************** Daemon handling functions ***************** */
/**
* Start a webserver on the given port.
*
* @param flags combination of MHD_FLAG values
* @param port port to bind to
* @param apc callback to call to check which clients
* will be allowed to connect; you can pass NULL
* in which case connections from any IP will be
* accepted
* @param apc_cls extra argument to apc
* @param dh handler called for all requests (repeatedly)
* @param dh_cls extra argument to dh
* @param ... list of options (type-value pairs,
* terminated with MHD_OPTION_END).
* @return NULL on error, handle to daemon on success
*/
struct MHD_Daemon *MHD_start_daemon_va (unsigned int options,
unsigned short port,
MHD_AcceptPolicyCallback apc,
void *apc_cls,
MHD_AccessHandlerCallback dh,
void *dh_cls, va_list ap);
/**
* Start a webserver on the given port. Variadic version of
* MHD_start_daemon_va.
*
* @param flags combination of MHD_FLAG values
* @param port port to bind to
* @param apc callback to call to check which clients
* will be allowed to connect; you can pass NULL
* in which case connections from any IP will be
* accepted
* @param apc_cls extra argument to apc
* @param dh handler called for all requests (repeatedly)
* @param dh_cls extra argument to dh
* @return NULL on error, handle to daemon on success
*/
struct MHD_Daemon *MHD_start_daemon (unsigned int flags,
unsigned short port,
MHD_AcceptPolicyCallback apc,
void *apc_cls,
MHD_AccessHandlerCallback dh,
void *dh_cls, ...);
/**
* Shutdown an http daemon.
*
* @param daemon daemon to stop
*/
void MHD_stop_daemon (struct MHD_Daemon *daemon);
/**
* Obtain the select sets for this daemon.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @return MHD_YES on success, MHD_NO if this
* daemon was not started with the right
* options for this call.
*/
int
MHD_get_fdset (struct MHD_Daemon *daemon,
fd_set * read_fd_set,
fd_set * write_fd_set, fd_set * except_fd_set, int *max_fd);
/**
* Obtain timeout value for select for this daemon
* (only needed if connection timeout is used). The
* returned value is how long select should at most
* block, not the timeout value set for connections.
*
* @param daemon daemon to query for timeout
* @param timeout set to the timeout (in milliseconds)
* @return MHD_YES on success, MHD_NO if timeouts are
* not used (or no connections exist that would
* necessiate the use of a timeout right now).
*/
int MHD_get_timeout (struct MHD_Daemon *daemon, unsigned long long *timeout);
/**
* Run webserver operations (without blocking unless
* in client callbacks). This method should be called
* by clients in combination with MHD_get_fdset
* if the client-controlled select method is used.
*
* @param daemon daemon to run
* @return MHD_YES on success, MHD_NO if this
* daemon was not started with the right
* options for this call.
*/
int MHD_run (struct MHD_Daemon *daemon);
/* **************** Connection handling functions ***************** */
/**
* Get all of the headers from the request.
*
* @param connection connection to get values from
* @param kind types of values to iterate over
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to iterator
* @return number of entries iterated over
*/
int
MHD_get_connection_values (struct MHD_Connection *connection,
enum MHD_ValueKind kind,
MHD_KeyValueIterator iterator, void *iterator_cls);
/**
* This function can be used to add an entry to
* the HTTP headers of a connection (so that the
* MHD_get_connection_values function will return
* them -- and the MHD PostProcessor will also
* see them). This maybe required in certain
* situations (see Mantis #1399) where (broken)
* HTTP implementations fail to supply values needed
* by the post processor (or other parts of the
* application).
* <p>
* This function MUST only be called from within
* the MHD_AccessHandlerCallback (otherwise, access
* maybe improperly synchronized). Furthermore,
* the client must guarantee that the key and
* value arguments are 0-terminated strings that
* are NOT freed until the connection is closed.
* (The easiest way to do this is by passing only
* arguments to permanently allocated strings.).
*
* @param connection the connection for which a
* value should be set
* @param kind kind of the value
* @param key key for the value
* @param value the value itself
* @return MHD_NO if the operation could not be
* performed due to insufficient memory;
* MHD_YES on success
*/
int
MHD_set_connection_value (struct MHD_Connection *connection,
enum MHD_ValueKind kind,
const char *key, const char *value);
/**
* Sets the global error handler to a different implementation. "cb"
* will only be called in the case of typically fatal, serious
* internal consistency issues. These issues should only arise in the
* case of serious memory corruption or similar problems with the
* architecture. While "cb" is allowed to return and MHD will then
* try to continue, this is never safe.
*
* The default implementation that is used if no panic function is set
* simply calls "abort". Alternative implementations might call
* "exit" or other similar functions.
*
* @param cb new error handler
* @param cls passed to error handler
*/
void MHD_set_panic_func (MHD_PanicCallback cb, void *cls);
/**
* Get a particular header value. If multiple
* values match the kind, return any one of them.
*
* @param connection connection to get values from
* @param kind what kind of value are we looking for
* @param key the header to look for
* @return NULL if no such item was found
*/
const char *MHD_lookup_connection_value (struct MHD_Connection *connection,
enum MHD_ValueKind kind,
const char *key);
/**
* Queue a response to be transmitted to the client (as soon as
* possible but after MHD_AccessHandlerCallback returns).
*
* @param connection the connection identifying the client
* @param status_code HTTP status code (i.e. 200 for OK)
* @param response response to transmit
* @return MHD_NO on error (i.e. reply already sent),
* MHD_YES on success or if message has been queued
*/
int
MHD_queue_response (struct MHD_Connection *connection,
unsigned int status_code, struct MHD_Response *response);
/* **************** Response manipulation functions ***************** */
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response, MHD_SIZE_UNKNOWN for unknown
* @param block_size preferred block size for querying crc (advisory only,
* MHD may still call crc using smaller chunks); this
* is essentially the buffer size used for IO, clients
* should pick a value that is appropriate for IO and
* memory performance requirements
* @param crc callback to use to obtain response data
* @param crc_cls extra argument to crc
* @param crfc callback to call to free crc_cls resources
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *MHD_create_response_from_callback (uint64_t size,
size_t block_size,
MHD_ContentReaderCallback
crc, void *crc_cls,
MHD_ContentReaderFreeCallback
crfc);
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response
* @param data the data itself
* @param must_free libmicrohttpd should free data when done
* @param must_copy libmicrohttpd must make a copy of data
* right away, the data maybe released anytime after
* this call returns
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *MHD_create_response_from_data (size_t size,
void *data,
int must_free,
int must_copy);
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response
* @param fd file descriptor referring to a file on disk with the data; will be closed when response is destroyed
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *MHD_create_response_from_fd (size_t size,
int fd);
/**
* Destroy a response object and associated resources. Note that
* libmicrohttpd may keep some of the resources around if the response
* is still in the queue for some clients, so the memory may not
* necessarily be freed immediatley.
*
* @param response response to destroy
*/
void MHD_destroy_response (struct MHD_Response *response);
/**
* Add a header line to the response.
*
* @param response response to add a header to
* @param header the header to add
* @param content value to add
* @return MHD_NO on error (i.e. invalid header or content format),
* or out of memory
*/
int
MHD_add_response_header (struct MHD_Response *response,
const char *header, const char *content);
/**
* Delete a header line from the response.
*
* @param response response to remove a header from
* @param header the header to delete
* @param content value to delete
* @return MHD_NO on error (no such header known)
*/
int
MHD_del_response_header (struct MHD_Response *response,
const char *header, const char *content);
/**
* Get all of the headers added to a response.
*
* @param response response to query
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to iterator
* @return number of entries iterated over
*/
int
MHD_get_response_headers (struct MHD_Response *response,
MHD_KeyValueIterator iterator, void *iterator_cls);
/**
* Get a particular header from the response.
*
* @param response response to query
* @param key which header to get
* @return NULL if header does not exist
*/
const char *MHD_get_response_header (struct MHD_Response *response,
const char *key);
/* ********************** PostProcessor functions ********************** */
/**
* Create a PostProcessor.
*
* A PostProcessor can be used to (incrementally) parse the data
* portion of a POST request. Note that some buggy browsers fail to
* set the encoding type. If you want to support those, you may have
* to call 'MHD_set_connection_value' with the proper encoding type
* before creating a post processor (if no supported encoding type is
* set, this function will fail).
*
* @param connection the connection on which the POST is
* happening (used to determine the POST format)
* @param buffer_size maximum number of bytes to use for
* internal buffering (used only for the parsing,
* specifically the parsing of the keys). A
* tiny value (256-1024) should be sufficient.
* Do NOT use a value smaller than 256.
* @param iter iterator to be called with the parsed data,
* Must NOT be NULL.
* @param cls first argument to ikvi
* @return NULL on error (out of memory, unsupported encoding),
otherwise a PP handle
*/
struct MHD_PostProcessor *MHD_create_post_processor (struct MHD_Connection
*connection,
size_t buffer_size,
MHD_PostDataIterator
iter, void *cls);
/**
* Parse and process POST data.
* Call this function when POST data is available
* (usually during an MHD_AccessHandlerCallback)
* with the upload_data and upload_data_size.
* Whenever possible, this will then cause calls
* to the MHD_IncrementalKeyValueIterator.
*
* @param pp the post processor
* @param post_data post_data_len bytes of POST data
* @param post_data_len length of post_data
* @return MHD_YES on success, MHD_NO on error
* (out-of-memory, iterator aborted, parse error)
*/
int
MHD_post_process (struct MHD_PostProcessor *pp,
const char *post_data, size_t post_data_len);
/**
* Release PostProcessor resources.
*
* @param pp the PostProcessor to destroy
* @return MHD_YES if processing completed nicely,
* MHD_NO if there were spurious characters / formatting
* problems; it is common to ignore the return
* value of this function
*/
int MHD_destroy_post_processor (struct MHD_PostProcessor *pp);
/* ********************** generic query functions ********************** */
/**
* Information about a connection.
*/
union MHD_ConnectionInfo
{
/**
* Cipher algorithm used, of type "enum gnutls_cipher_algorithm".
*/
int /* enum gnutls_cipher_algorithm */ cipher_algorithm;
/**
* Protocol used, of type "enum gnutls_protocol".
*/
int /* enum gnutls_protocol */ protocol;
/**
* GNUtls session handle, of type "gnutls_session_t".
*/
void * /* gnutls_session_t */ tls_session;
/**
* Address information for the client.
*/
struct sockaddr_in * client_addr;
};
/**
* Obtain information about the given connection.
*
* @param connection what connection to get information about
* @param infoType what information is desired?
* @param ... depends on infoType
* @return NULL if this information is not available
* (or if the infoType is unknown)
*/
const union MHD_ConnectionInfo *MHD_get_connection_info (struct MHD_Connection
*connection,
enum
MHD_ConnectionInfoType
infoType, ...);
/**
* Information about an MHD daemon.
*/
union MHD_DaemonInfo
{
/**
* Size of the key (unit??)
*/
size_t key_size;
/**
* Size of the mac key (unit??)
*/
size_t mac_key_size;
/**
* Listen socket file descriptor
*/
int listen_fd;
};
/**
* Obtain information about the given daemon
* (not fully implemented!).
*
* @param daemon what daemon to get information about
* @param infoType what information is desired?
* @param ... depends on infoType
* @return NULL if this information is not available
* (or if the infoType is unknown)
*/
const union MHD_DaemonInfo *MHD_get_daemon_info (struct MHD_Daemon *daemon,
enum MHD_DaemonInfoType
infoType, ...);
/**
* Obtain the version of this library
*
* @return static version string, e.g. "0.4.1"
*/
const char* MHD_get_version(void);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
#endif
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