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// Copyright (c) 2004-2013 Sergey Lyubka <>
// Copyright (c) 2013-2014 Cesanta Software Limited
// All rights reserved
// This software is dual-licensed: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation. For the terms of this
// license, see <>.
// You are free to use this software under the terms of the GNU General
// Public License, but WITHOUT ANY WARRANTY; without even the implied
// See the GNU General Public License for more details.
// Alternatively, you can license this software under a commercial
// license, as set out in <>.
#define MONGOOSE_VERSION "5.6"
#include <stdio.h> // required for FILE
#include <stddef.h> // required for size_t
#include <sys/types.h> // required for time_t
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
// This structure contains information about HTTP request.
struct mg_connection {
const char *request_method; // "GET", "POST", etc
const char *uri; // URL-decoded URI
const char *http_version; // E.g. "1.0", "1.1"
const char *query_string; // URL part after '?', not including '?', or NULL
char remote_ip[48]; // Max IPv6 string length is 45 characters
char local_ip[48]; // Local IP address
unsigned short remote_port; // Client's port
unsigned short local_port; // Local port number
int num_headers; // Number of HTTP headers
struct mg_header {
const char *name; // HTTP header name
const char *value; // HTTP header value
} http_headers[30];
char *content; // POST (or websocket message) data, or NULL
size_t content_len; // Data length
int is_websocket; // Connection is a websocket connection
int status_code; // HTTP status code for HTTP error handler
int wsbits; // First byte of the websocket frame
void *server_param; // Parameter passed to mg_create_server()
void *connection_param; // Placeholder for connection-specific data
void *callback_param;
struct mg_server; // Opaque structure describing server instance
enum mg_result { MG_FALSE, MG_TRUE, MG_MORE };
enum mg_event {
MG_POLL = 100, // If callback returns MG_TRUE connection closes
// after all of data is sent
MG_CONNECT, // If callback returns MG_FALSE, connect fails
MG_AUTH, // If callback returns MG_FALSE, authentication fails
MG_REQUEST, // If callback returns MG_FALSE, Mongoose continues with req
MG_REPLY, // If callback returns MG_FALSE, Mongoose closes connection
MG_RECV, // Mongoose has received POST data chunk.
// Callback should return a number of bytes to discard from
// the receive buffer, or -1 to close the connection.
MG_CLOSE, // Connection is closed, callback return value is ignored
MG_WS_HANDSHAKE, // New websocket connection, handshake request
MG_WS_CONNECT, // New websocket connection established
MG_HTTP_ERROR // If callback returns MG_FALSE, Mongoose continues with err
typedef int (*mg_handler_t)(struct mg_connection *, enum mg_event);
// Websocket opcodes, from
enum {
// Server management functions
struct mg_server *mg_create_server(void *server_param, mg_handler_t handler);
void mg_destroy_server(struct mg_server **);
const char *mg_set_option(struct mg_server *, const char *opt, const char *val);
time_t mg_poll_server(struct mg_server *, int milliseconds);
const char **mg_get_valid_option_names(void);
const char *mg_get_option(const struct mg_server *server, const char *name);
void mg_copy_listeners(struct mg_server *from, struct mg_server *to);
struct mg_connection *mg_next(struct mg_server *, struct mg_connection *);
void mg_wakeup_server(struct mg_server *);
void mg_wakeup_server_ex(struct mg_server *, mg_handler_t, const char *, ...);
struct mg_connection *mg_connect(struct mg_server *, const char *);
// Connection management functions
void mg_send_status(struct mg_connection *, int status_code);
void mg_send_header(struct mg_connection *, const char *name, const char *val);
size_t mg_send_data(struct mg_connection *, const void *data, int data_len);
size_t mg_printf_data(struct mg_connection *, const char *format, ...);
size_t mg_vprintf_data(struct mg_connection *, const char *format, va_list ap);
size_t mg_write(struct mg_connection *, const void *buf, size_t len);
size_t mg_printf(struct mg_connection *conn, const char *fmt, ...);
size_t mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap);
size_t mg_websocket_write(struct mg_connection *, int opcode,
const char *data, size_t data_len);
size_t mg_websocket_printf(struct mg_connection* conn, int opcode,
const char *fmt, ...);
void mg_send_file(struct mg_connection *, const char *path, const char *);
void mg_send_file_data(struct mg_connection *, int fd);
const char *mg_get_header(const struct mg_connection *, const char *name);
const char *mg_get_mime_type(const char *name, const char *default_mime_type);
int mg_get_var(const struct mg_connection *conn, const char *var_name,
char *buf, size_t buf_len);
int mg_get_var_n(const struct mg_connection *conn, const char *var_name,
char *buf, size_t buf_len, int n);
int mg_parse_header(const char *hdr, const char *var_name, char *buf, size_t);
int mg_parse_multipart(const char *buf, int buf_len,
char *var_name, int var_name_len,
char *file_name, int file_name_len,
const char **data, int *data_len);
// Utility functions
void *mg_start_thread(void *(*func)(void *), void *param);
char *mg_md5(char buf[33], ...);
int mg_authorize_digest(struct mg_connection *c, FILE *fp);
size_t mg_url_encode(const char *src, size_t s_len, char *dst, size_t dst_len);
int mg_url_decode(const char *src, size_t src_len, char *dst, size_t dst_len, int);
int mg_terminate_ssl(struct mg_connection *c, const char *cert);
int mg_forward(struct mg_connection *c, const char *addr);
void *mg_mmap(FILE *fp, size_t size);
void mg_munmap(void *p, size_t size);
// Templates support
struct mg_expansion {
const char *keyword;
void (*handler)(struct mg_connection *);
void mg_template(struct mg_connection *, const char *text,
struct mg_expansion *expansions);
#ifdef __cplusplus
#endif // __cplusplus
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