/* libhttpd.h - defines for libhttpd
**
** Copyright (c) 1995,1998,1999,2000,2001 by Jef Poskanzer <jef@mail.acme.com>.
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
*/

#ifndef _LIBHTTPD_H_
#define _LIBHTTPD_H_

#include <sys/types.h>
#include <sys/time.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

#if defined(AF_INET6) && defined(IN6_IS_ADDR_V4MAPPED)
#define USE_IPV6
#endif


/* A few convenient defines. */

#ifndef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
#define NEW(t,n) ((t*) malloc( sizeof(t) * (n) ))
#define RENEW(o,t,n) ((t*) realloc( (void*) o, sizeof(t) * (n) ))


/* The httpd structs. */

/* A multi-family sockaddr. */
typedef union
{
	struct sockaddr sa;
	struct sockaddr_in sa_in;
#ifdef USE_IPV6
	struct sockaddr_in6 sa_in6;
	struct sockaddr_storage sa_stor;
#endif													/* USE_IPV6 */
} httpd_sockaddr;

/* A server. */
typedef struct
{
	char *binding_hostname;
	char *server_hostname;
	unsigned short port;
	char *cgi_pattern;
	int cgi_limit, cgi_timelimit, cgi_count;
	char *charset;
	char *p3p;
	int max_age;
	char *cwd;
	int listen4_fd, listen6_fd;
	int no_log;
	FILE *logfp;
	int no_symlink_check;
	int vhost;
	int global_passwd;
	char *url_pattern;
	char *local_pattern;
	int no_empty_referers;
	unsigned debug : 1;
} httpd_server;

/* A connection. */
typedef struct
{
	int initialized;
	httpd_server *hs;
	httpd_sockaddr client_addr;
	char *read_buf;
	size_t read_size, read_idx, checked_idx;
	int checked_state;
	int method;
	int status;
	off_t bytes_to_send;
	off_t bytes_sent;
	char *encodedurl;
	char *decodedurl;
	char *protocol;
	char *origfilename;
	char *expnfilename;
	char *encodings;
	char *pathinfo;
	char *query;
	char *referer;
	char *useragent;
	char *accept;
	char *accepte;
	char *acceptl;
	char *cookie;
	char *contenttype;
#ifdef X_CGI_HEADER
	char *xcgi;
#endif
	char *reqhost;
	char *hdrhost;
	char *hostdir;
	char *authorization;
	char *remoteuser;
	char *response;
	size_t maxdecodedurl, maxorigfilename, maxexpnfilename, maxencodings,
		maxpathinfo, maxquery, maxaccept, maxaccepte, maxreqhost, maxhostdir,
		maxremoteuser, maxresponse;
#ifdef TILDE_MAP_2
	char *altdir;
	size_t maxaltdir;
#endif													/* TILDE_MAP_2 */
	size_t responselen;
	time_t if_modified_since, range_if;
	size_t contentlength;
	char *type;										/* not malloc()ed */
	char *hostname;								/* not malloc()ed */
	int mime_flag;
	int one_one;									/* HTTP/1.1 or better */
	int got_range;
	int tildemapped;							/* this connection got tilde-mapped */
	off_t first_byte_index, last_byte_index;
	int keep_alive;
	int should_linger;
	GB_FILE_STAT sb;
	int conn_fd;
	char *file_address;
	int file_len;
} httpd_conn;

/* Methods. */
#define METHOD_UNKNOWN 0
#define METHOD_GET 1
#define METHOD_HEAD 2
#define METHOD_POST 3

/* States for checked_state. */
#define CHST_FIRSTWORD 0
#define CHST_FIRSTWS 1
#define CHST_SECONDWORD 2
#define CHST_SECONDWS 3
#define CHST_THIRDWORD 4
#define CHST_THIRDWS 5
#define CHST_LINE 6
#define CHST_LF 7
#define CHST_CR 8
#define CHST_CRLF 9
#define CHST_CRLFCR 10
#define CHST_BOGUS 11


/* Initializes.  Does the socket(), bind(), and listen().   Returns an
** httpd_server* which includes a socket fd that you can select() on.
** Return (httpd_server*) 0 on error.
*/
extern httpd_server *httpd_initialize(char *hostname, httpd_sockaddr * sa4P,
																			httpd_sockaddr * sa6P,
																			unsigned short port, char *cgi_pattern,
																			int cgi_limit, int cgi_timelimit,
																			char *charset, char *p3p, int max_age,
																			char *cwd, int no_log, FILE * logfp,
																			int no_symlink_check, int vhost,
																			int global_passwd, char *url_pattern,
																			char *local_pattern,
																			int no_empty_referers);

/* Change the log file. */
extern void httpd_set_logfp(httpd_server * hs, FILE * logfp);

/* Call to unlisten/close socket(s) listening for new connections. */
extern void httpd_unlisten(httpd_server * hs);

/* Call to shut down. */
extern void httpd_terminate(httpd_server * hs);


/* When a listen fd is ready to read, call this.  It does the accept() and
** returns an httpd_conn* which includes the fd to read the request from and
** write the response to.  Returns an indication of whether the accept()
** failed, succeeded, or if there were no more connections to accept.
**
** In order to minimize malloc()s, the caller passes in the httpd_conn.
** The caller is also responsible for setting initialized to zero before the
** first call using each different httpd_conn.
*/
extern int httpd_get_conn(httpd_server * hs, int listen_fd, httpd_conn * hc);
#define GC_FAIL 0
#define GC_OK 1
#define GC_NO_MORE 2

/* Checks whether the data in hc->read_buf constitutes a complete request
** yet.  The caller reads data into hc->read_buf[hc->read_idx] and advances
** hc->read_idx.  This routine checks what has been read so far, using
** hc->checked_idx and hc->checked_state to keep track, and returns an
** indication of whether there is no complete request yet, there is a
** complete request, or there won't be a valid request due to a syntax error.
*/
extern int httpd_got_request(httpd_conn * hc);
#define GR_NO_REQUEST 0
#define GR_GOT_REQUEST 1
#define GR_BAD_REQUEST 2

/* Parses the request in hc->read_buf.  Fills in lots of fields in hc,
** like the URL and the various headers.
**
** Returns -1 on error.
*/
extern int httpd_parse_request(httpd_conn * hc);

/* Starts sending data back to the client.  In some cases (directories,
** CGI programs), finishes sending by itself - in those cases, hc->file_fd
** is <0.  If there is more data to be sent, then hc->file_fd is a file
** descriptor for the file to send.  If you don't have a current timeval
** handy just pass in 0.
**
** Returns -1 on error.
*/
extern int httpd_start_request(httpd_conn * hc, struct timeval *nowP);

/* Actually sends any buffered response text. */
extern void httpd_write_response(httpd_conn * hc);

/* Call this to close down a connection and free the data.  A fine point,
** if you fork() with a connection open you should still call this in the
** parent process - the connection will stay open in the child.
** If you don't have a current timeval handy just pass in 0.
*/
extern void httpd_close_conn(httpd_conn * hc, struct timeval *nowP);

/* Call this to de-initialize a connection struct and *really* free the
** mallocced strings.
*/
extern void httpd_destroy_conn(httpd_conn * hc);


/* Send an error message back to the client. */
extern void httpd_send_err(httpd_conn * hc, int status, char *title,
													 char *extraheads, char *form, char *arg);

/* Some error messages. */
extern char *httpd_err400title;
extern char *httpd_err400form;
extern char *httpd_err408title;
extern char *httpd_err408form;
extern char *httpd_err503title;
extern char *httpd_err503form;

/* Generate a string representation of a method number. */
extern char *httpd_method_str(int method);

/* Reallocate a string. */
extern void httpd_realloc_str(char **strP, size_t * maxsizeP, size_t size);

/* Format a network socket to a string representation. */
extern char *httpd_ntoa(httpd_sockaddr * saP);

/* Set NDELAY mode on a socket. */
extern void httpd_set_ndelay(int fd);

/* Clear NDELAY mode on a socket. */
extern void httpd_clear_ndelay(int fd);

/* Read the requested buffer completely, accounting for interruptions. */
extern int httpd_read_fully(int fd, void *buf, size_t nbytes);

/* Write the requested buffer completely, accounting for interruptions. */
extern int httpd_write_fully(int fd, const void *buf, size_t nbytes);

/* Generate debugging statistics syslog message. */
extern void httpd_logstats(long secs);

extern int httpd_check_paused(httpd_conn *hc);

#endif /* _LIBHTTPD_H_ */