/* Package Name    : twhttpd
 * File Name       : twhttpd.h
 * Author          : Sam NG <samng@computer.org>
 *
 * This package is an secure HTTP application proxy writen by Sam Ng.
 * Copyright (C) 2001 SAM NG
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 * 
 * This program 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 General Public License for more details.
 *  
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, 
 * MA  02111-1307, USA.
 */


#include "config.h"
#include "structs.h"

/* time format */
#define RFC1123 "%a, %d %b %Y %H:%M:%S GMT"

/* here are some common HTTP response code */
#define OK                            200
#define MOVED                         301
#define MOVED_TEMPORARILY             302
#define NOT_MODIFIED                  304
#define BAD_REQUEST                   400
#define UNAUTHORIZED                  401
#define FORBIDDEN                     403
#define NOT_FOUND                     404
#define METHOD_NOT_ALLOWED            405
#define PROXY_AUTHENTICATION_REQUIRED 407
#define REQUEST_TIMEOUT               408
#define REQUEST_ENTITY_TOO_LARGE      413
#define REQUEST_URI_TOO_LONG          414
#define INTERNAL_SERVER_ERROR         500
#define NOT_IMPLEMENTED               501
#define BAD_GATEWAY                   502
#define SERVICE_UNAVAILABLE           503
#define GATEWAY_TIMEOUT               504
#define HTTP_VERSION_NOT_SUPPORTED    505

/* here are internal use error code */
#define E_SOCK                       1001
#define E_SOCK_READ                  1002
#define E_SOCK_WRITE                 1003

#define WITH_CACHE                   1
#define NO_CACHE                     0

#define DOMAIN_REGEX        "^([0-9a-z]+((\\_|\\-)[0-9a-z]+)*\\.)+(com|net|org|edu|gov|mil|int|[a-z][a-z])$"
#define HOST_REGEX          "^([0-9a-z]+((\\_|\\-)[0-9a-z]+)*\\.)+(com|net|org|edu|gov|mil|int|[a-z][a-z])(\\:[0-9]{1,3})*$"

void daemonize(void);
void handle_sigchld(int x);

// http library
void init_rab(rabuf *rab);
void init_lzb(lzbuf *lzb);
void init_http_header(http_header *hd);
void clean_http_header(http_header *hd);
void http_srv(http_header *hd);
int http_proxy(http_header *hd);
int gen_abs_url(http_header *hd);
int parse_location(http_header *hd, char *line);
int parse_request(http_header *hd, char *line);
int parse_path(http_header *hd);
int send_file (http_header *hd, int cache);
int send_dir (http_header *hd);
int send_request(http_header *hd);
int send_header (http_header *hd, int cache, int length, char *mime, time_t at_time);
int send_error (http_header *hd, int error_no);

// socket related
char *read_line(int fd, rabuf *rab);
int read_line2(int fd, char *newline, int max, rabuf *rab);
int lz_write(int fd, char *line, int length, lzbuf *lzb);
int lz_flush(int write_fd, lzbuf *lzb);
int wait_writable(int fd);
int relay_data(int read_fd, rabuf *rab, int write_fd, int cache_fd, int n);
int relay_2way(int fd1, int fd2);
int set_nonblock(int fd);
int set_block(int fd);
int nonb_connect(int fd, struct sockaddr_in *addr, int addr_len);
int slow_close(int fd);
int Listen_srv(struct sockaddr_in *srv_addr);

// string parser and condition checker
int hex2int (char c);
void de_hexcode (char *str);
int hex_encode (char *str, int max_buf);
void de_dotdot (char *str);
int expand_link (char *path, int link);
int search_index (http_header *hd);
char *check_mime_type (char *path);
char *mode2str (mode_t mode, char *string, int i);
int is_dir (char *path);
int is_cgi_path (char *path);
int resolv_remote(http_header *hd);
char *find_ext(char *fname);
int invalid_ext(char *ext);
int non_ascii(char *fname);
int is_hidden(char *fname);
int is_dotdotdot(char *fname);
int has_meta(char *string, char *meta);
int is_valid (char *text, char *pattern);
int hash(http_header *);
time_t decode_time(char *);
int is_cached(http_header *);
void show_usage(char *name);
void show_version(char *name);

/* global variables */
int     debug;