server.c

/*
 |**************************************************|
 |*| Computer Systems (COMP20023) 2018 Semester 1 |*|
 |*| Assignment 1 - Multithreaded HTTP/1.0 Server |*|
 |**************************************************|
 |**| Student ID: |******|       Name:      |*******|
 |**|   798839    |******| Saleh Ahmed Khan |*******|
 |**************************************************|
 |* Credit: Used Sample code from LMS for sockets  *|
 */


#include "server.h"

int main(int argc, char *argv[]) {
	/* Sample code starts here, not changed
	   or commented as per clarification
	   with the tutor via email */
	
	int sockfd, newsockfd, portno;
	char buffer[BUF];
	struct sockaddr_in serv_addr, cli_addr;
	socklen_t clilen;
	int n;

	if (argc < 2) {
		fprintf(stderr, "Usage \"./name <port> ./<root>\"\n");
		exit(1);
	}

	 /* Create TCP socket */
	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	if (sockfd < 0) {
		perror("ERROR opening socket");
		exit(1);
	}

	
	bzero((char *) &serv_addr, sizeof(serv_addr));
	portno = atoi(argv[1]);
	/* Create address we're going to listen on (given port number)
	 - converted to network byte order & any IP address for 
	 this machine */
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_addr.s_addr = INADDR_ANY;
	serv_addr.sin_port = htons(portno);  // store in machine-neutral format

	/* Bind address to the socket */
	if (bind(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
		perror("ERROR on binding");
		exit(1);
	}
	
	/* Listen on socket - means we're ready to accept connections - 
	 incoming connection requests will be queued */
	listen(sockfd,5);
	clilen = sizeof(cli_addr);

	/* End of sample code. Most of my own code starts here: */
	
	char* root = argv[2];
	while (INFINITE_LOOP) {
		/* Accept a connection - block until a connection is ready to
		be accepted. Get back a new file descriptor to communicate on. */
		newsockfd = accept(	sockfd, (struct sockaddr *) &cli_addr, 
							&clilen);
		if (newsockfd < 0) {
			continue;
		}
		/* Multithreading using fork(), based on clarification
		   by Professor this is a valid alternative to pthreads.
		   Based on comparative testing vs pthreads this works
		   efficiently and makes code shorter and more readable.
		*/
		if (!fork()) {
			close(sockfd);
			/* Read characters from the connection, then process */
			read(newsockfd, buffer, BUF-1);
			parse_request_and_send_response(root, buffer, newsockfd);
			close(newsockfd);
		}
		close(newsockfd);
	}
	
	/* close socket */
	close(sockfd);
	
	return 0; 
}