transmission/third-party/shttpd/shttpd.h

110 lines
4.4 KiB
C

/*
* Copyright (c) 2004-2008 Sergey Lyubka <valenok@gmail.com>
* All rights reserved
*
* "THE BEER-WARE LICENSE" (Revision 42):
* Sergey Lyubka wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return.
*
* $Id: shttpd.h,v 1.16 2008/05/31 09:02:02 drozd Exp $
*/
#ifndef SHTTPD_HEADER_INCLUDED
#define SHTTPD_HEADER_INCLUDED
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
struct ubuf {
char *buf; /* Buffer pointer */
int len; /* Size of a buffer */
int num_bytes; /* Bytes processed by callback */
};
/*
* This structure is passed to the user callback function
*/
struct shttpd_arg {
void *priv; /* Private! Do not touch! */
void *state; /* User state */
void *user_data; /* Data from register_uri() */
struct ubuf in; /* Input is here, POST data */
struct ubuf out; /* Output goes here */
unsigned int flags;
#define SHTTPD_END_OF_OUTPUT 1 /* No more data do send */
#define SHTTPD_CONNECTION_ERROR 2 /* Server closed the connection */
#define SHTTPD_MORE_POST_DATA 4 /* arg->in has incomplete data */
#define SHTTPD_POST_BUFFER_FULL 8 /* arg->in has max data */
#define SHTTPD_SSI_EVAL_TRUE 16 /* SSI eval callback must set it*/
#define SHTTPD_SUSPEND 32 /* User wants to suspend output */
};
/*
* User callback function. Called when certain registered URLs have been
* requested. These are the requirements to the callback function:
*
* 1. It must copy data into 'out.buf' buffer, not more than 'out.len' bytes,
* and record how many bytes are copied, into 'out.num_bytes'
* 2. It must not call any blocking functions
* 3. It must set SHTTPD_END_OF_OUTPUT flag when there is no more data to send
* 4. For POST requests, it must process the incoming data (in.buf) of length
* 'in.len', and set 'in.num_bytes', which is how many bytes of POST
* data was processed and can be discarded by SHTTPD.
* 5. If callback allocates arg->state, to keep state, it must deallocate it
* at the end of coonection SHTTPD_CONNECTION_ERROR or SHTTPD_END_OF_OUTPUT
* 6. If callback function wants to suspend until some event, it must store
* arg->priv pointer elsewhere, set SHTTPD_SUSPEND flag and return. When
* the event happens, user code should call shttpd_wakeup(priv).
* It is safe to call shttpd_wakeup() from any thread. User code must
* not call shttpd_wakeup once the connection is closed.
*/
typedef void (*shttpd_callback_t)(struct shttpd_arg *);
/*
* shttpd_init Initialize shttpd context
* shttpd_fini Dealocate the context, close all connections
* shttpd_set_option Set new value for option
* shttpd_register_uri Setup the callback function for specified URL
* shttpd_poll Do connections processing
* shttpd_version return string with SHTTPD version
* shttpd_get_var Fetch POST/GET variable value by name. Return value len
* shttpd_get_header return value of the specified HTTP header
* shttpd_get_env return values for the following pseudo-variables:
"REQUEST_METHOD", "REQUEST_URI",
* "REMOTE_USER" and "REMOTE_ADDR"
* shttpd_printf helper function to output data
* shttpd_handle_error register custom HTTP error handler
* shttpd_wakeup clear SHTTPD_SUSPEND state for the connection
*/
struct shttpd_ctx;
struct shttpd_ctx *shttpd_init(int argc, char *argv[]);
void shttpd_set_option(struct shttpd_ctx *, const char *opt, const char *val);
void shttpd_fini(struct shttpd_ctx *);
void shttpd_register_uri(struct shttpd_ctx *ctx, const char *uri,
shttpd_callback_t callback, void *const user_data);
void shttpd_poll(struct shttpd_ctx *, int milliseconds);
const char *shttpd_version(void);
int shttpd_get_var(const char *var, const char *buf, int buf_len,
char *value, int value_len);
const char *shttpd_get_header(struct shttpd_arg *, const char *header_name);
const char *shttpd_get_env(struct shttpd_arg *, const char *name);
void shttpd_get_http_version(struct shttpd_arg *,
unsigned long *major, unsigned long *minor);
size_t shttpd_printf(struct shttpd_arg *, const char *fmt, ...);
void shttpd_handle_error(struct shttpd_ctx *ctx, int status,
shttpd_callback_t func, void *const data);
void shttpd_register_ssi_func(struct shttpd_ctx *ctx, const char *name,
shttpd_callback_t func, void *const user_data);
void shttpd_wakeup(const void *priv);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* SHTTPD_HEADER_INCLUDED */