wspp.c

来自「WSP is an HTTP to WSP proxy that can be 」· C语言 代码 · 共 246 行

/*
Copyright (c) 2002-2003 Nicolas Jombart - HSC

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.
3. The name of the author may not be used to endorse or promote products
   derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/

/* 
 * wspp.c - main function
 * $Id: wspp.c,v 1.21 2004/09/08 09:33:56 jombart Exp $
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <time.h>
#include <sys/errno.h>
#include <sys/signal.h>
#include <sys/wait.h>

#include "wspp.h"

/* 
 * signal stuff 
 */
void child_sig_handler(void) { while (waitpid(-1, NULL, WNOHANG) > 0); }

/* 
 * Main program
 * create socket and deals with data
 */
int main(int argc, char **argv) {
	int proxyport = DEFAULT_LISTEN_PORT;
	int srv_sd, read_sd;
	char *str;
	char c;
	int one = 1;
	int i = 0;
	int gwport = 0;
	int socklen;
	int tosend = 0;
	char *gwaddr;
	ssize_t len;
	char *wsp_packet;
	struct hostent *name;
	struct in_addr server;

	struct sockaddr_in srv_addr;
	char line[512];
	char *resp;
	char *buffer;
	int resplen;

	/* Data - globals */
	wsp_reply *data;
	http *response;
	request *req;
 
	/* "parse" options */
	if(argc < 2 || argc > 4) {
		usage(argv[0]); exit(0);
	}
	else {
		gwaddr = strdup(argv[1]);
		if(argc >= 3) { gwport = atoi(argv[2]); }
		else { gwport = DEFAULT_GW_PORT; }
		if(argc == 4) { proxyport = atoi(argv[3]); }
	}

	/* banner */
	printf("WSPP v" WSPP_VERSION "   (c) 2003-2004 HSC\n");

	memset(&srv_addr, 0, sizeof(struct sockaddr_in));

	name = gethostbyname(LOCALHOST);
	memcpy(&server.s_addr, name->h_addr_list[0], 4);

	srv_addr.sin_family	= AF_INET;
	srv_addr.sin_addr.s_addr = server.s_addr;
	srv_addr.sin_port = htons(proxyport);

	srv_sd = socket(PF_INET, SOCK_STREAM, 0);

	setsockopt(srv_sd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(int));

	if( bind(srv_sd, (struct sockaddr *) &srv_addr, sizeof(srv_addr)) < 0 ) 
	{
		perror("bind");
		exit(1);
	}

	if(listen(srv_sd, BACKLOG) < 0) {
		perror("listen");
		exit(1);
	}

	setsockopt(srv_sd, 6, TCP_NODELAY, &one, sizeof(int));

	signal(SIGCHLD, (void *) child_sig_handler);

	/* accept infinite loop */
	for(;;) {

#ifdef DEBUG
		printf("Waiting for data on port TCP %u\n",proxyport);
#endif
		socklen = sizeof(struct sockaddr_in);

		if((read_sd = accept(srv_sd, (struct sockaddr *) &srv_addr, &socklen))
			< 0) {
			perror("accept");
			exit(1);
		}
   
		switch(fork()) {

			case -1:
				perror("fork");
				exit (1);

			case 0: /* child */
				close(srv_sd); /* duplicate */
				srand(time(NULL));
				memset(line,0x0,512);

				req = (request *) malloc(sizeof(request));
				req->parse_state = PARSE_TODO;

				/* now */
				response = (http *) malloc(sizeof(http));

				while((str = dgetln(read_sd, &len)) != NULL) {

					/* New line => post or finished*/
					if(!len) {
						if((req->method == WSP_POST) 
							&& (req->content_length > 0)
						    && (req->parse_state != PARSE_OKTOCLOSE)) {
							req->parse_state = PARSE_POST_TODO;
						}
						else {
							req->parse_state = PARSE_OK;
							break;
						}
        			}
					/* Get POST data or parse lines */
					if(req->parse_state == PARSE_POST_TODO)  {
						req->data = (char *) malloc(req->data_length + 1);
						for (i=0; read(read_sd, &c, 1) == 1; i++) {
							*(req->data+i) = c;
							req->data_length++;
							if(req->data_length == req->content_length) break;
						}
						/* FIXME */
						req->parse_state = PARSE_OK; break;
					}
					else parse_req(req, str);

					if(req->parse_state == PARSE_ERROR) {
						printf("Error on request parsing -> send error 500\n");
						error500(response, 0); goto response;
					}
				}

				/* log */
				printf("Request %s from %s:%d ... ", 
					   req->uri, inet_ntoa(srv_addr.sin_addr),
					   ntohs(srv_addr.sin_port));
				fflush(stdout);

				wsp_packet = wsp(req, &tosend);

				if(wsp_packet == NULL) {
					printf("Error on WSP\n");
					error500(response, 0);
					goto response;
				}

				resp = (char *) malloc(MAX_RESPONSE);
				resplen = do_wap(resp, wsp_packet, tosend, gwaddr, gwport);

				if(resplen < 0) {
					error500(response, 0);
					goto response;
				}

				data = (wsp_reply *) malloc(sizeof(wsp_reply));
				parse_wsp(data, resp, resplen);

				wsp_to_http(response, data);
response:
				buffer = (char *) malloc((strlen(response->headers) + response->data_length) * sizeof(char));
				strcpy(buffer, response->headers);
				memcpy(buffer + strlen(response->headers), response->data, response->data_length);

				i = write(read_sd, buffer, 
				         strlen(response->headers) + response->data_length);
				/* one shot */
				if(i < strlen(response->headers) + response->data_length) {
					perror("write");
				} else {
					/* log FIXME: when a child respond before another */
#ifdef DEBUG
					printf("Content of URI %s sent back to client (%s)\n",
					       req->uri, inet_ntoa(srv_addr.sin_addr));
#else				
					printf("ok\n");
#endif
				}
				close(read_sd);
				exit (0);

			default: /* parent */
				close(read_sd);
				break;
		}
	}
}