GuilhermeRossato · August 2, 2019 19:53
diff --git a/http_multiclient_server.c b/http_multiclient_server.c
 /*
 	Simple http server (with multiple connections)
 */

 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <sys/wait.h>

 #define BUFLEN	1024	//Max length of buffer
 #define PORT	8000	//The port on which to listen for incoming data


 char http_ok[] = "HTTP/1.0 200 OK\r\nContent-type: text/html\r\nServer: Test\r\n\r\n";
 char http_error[] = "HTTP/1.0 400 Bad Request\r\nContent-type: text/html\r\nServer: Test\r\n\r\n";
 char page[] = "<html>\n<head>\n<title>\nTest page\n</title>\n</head>\n<body>\n<p>Hello World!</p>\n</body>\n</html>\n";


 void die(char *s) {
 	perror(s);
 	exit(1);
 }

 int main(void) {
 	struct sockaddr_in si_me, si_other;

 	int s, i, slen = sizeof(si_other) , recv_len, conn, child = 0;
 	char buf[BUFLEN];
 	pid_t pid;

 	/* create a TCP socket */
 	if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
 		die("socket");
 	}

 	/* zero out the structure */
 	memset((char *) &si_me, 0, sizeof(si_me));

 	si_me.sin_family = AF_INET;
 	si_me.sin_port = htons(PORT);
 	si_me.sin_addr.s_addr = htonl(INADDR_ANY);

 	/* bind socket to port */
 	if (bind(s, (struct sockaddr*)&si_me, sizeof(si_me)) == -1) {
 		die("bind");
 	}

 	/* allow 10 requests to queue up */
 	if (listen(s, 10) == -1) {
 		die("listen");
 	}

 	/* keep listening for data */
 	while (1) {
 		memset(buf, 0, sizeof(buf));
 		printf("Waiting a connection...");
 		fflush(stdout);

 		conn = accept(s, (struct sockaddr *) &si_other, &slen);
 		if (conn < 0)
 			die("accept");

 		if ((pid = fork()) < 0) {
 			die("fork");
 		} else if (pid == 0) {
 			close(s);

 			printf("Client connected: %s:%d\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));

 			/* try to receive some data, this is a blocking call at child */
 			recv_len = read(conn, buf, BUFLEN);
 			if (recv_len < 0) {
 				die("read");
 			}

 			/* print details of the client/peer and the data received */
 			printf("Data: %s\n" , buf);

 			if (strstr(buf, "GET")) {
 				/* now reply the client with the same data */
 				if (write(conn, http_ok, strlen(http_ok)) < 0) {
 					die("write");
 				}
 				if (write(conn, page, strlen(page)) < 0) {
 					die("write");
 				}
 			} else {
 				if (write(conn, http_error, strlen(http_error)) < 0) {
 					die("write");
 				}
 			}

 			exit(0);
 		}

 		/* close the connection */
 		close(conn);

 		child++;
 		while (child) {
 			pid = waitpid((pid_t) -1, NULL, WNOHANG);
 			if (pid < 0) {
 				die("?");
 			} else if (pid == 0) {
 				break;
 			} else {
 				child--;
 			}
 		}
 	}
 	close(s);

 	return 0;
 }
	/*
	Simple http server (with multiple connections)
	*/

	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	#include <arpa/inet.h>
	#include <sys/socket.h>
	#include <sys/wait.h>

	#define BUFLEN 1024 //Max length of buffer
	#define PORT 8000 //The port on which to listen for incoming data


	char http_ok[] = "HTTP/1.0 200 OK\r\nContent-type: text/html\r\nServer: Test\r\n\r\n";
	char http_error[] = "HTTP/1.0 400 Bad Request\r\nContent-type: text/html\r\nServer: Test\r\n\r\n";
	char page[] = "<html>\n<head>\n<title>\nTest page\n</title>\n</head>\n<body>\n<p>Hello World!</p>\n</body>\n</html>\n";


	void die(char *s) {
	perror(s);
	exit(1);
	}

	int main(void) {
	struct sockaddr_in si_me, si_other;

	int s, i, slen = sizeof(si_other) , recv_len, conn, child = 0;
	char buf[BUFLEN];
	pid_t pid;

	/* create a TCP socket */
	if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
	die("socket");
	}

	/* zero out the structure */
	memset((char *) &si_me, 0, sizeof(si_me));

	si_me.sin_family = AF_INET;
	si_me.sin_port = htons(PORT);
	si_me.sin_addr.s_addr = htonl(INADDR_ANY);

	/* bind socket to port */
	if (bind(s, (struct sockaddr*)&si_me, sizeof(si_me)) == -1) {
	die("bind");
	}

	/* allow 10 requests to queue up */
	if (listen(s, 10) == -1) {
	die("listen");
	}

	/* keep listening for data */
	while (1) {
	memset(buf, 0, sizeof(buf));
	printf("Waiting a connection...");
	fflush(stdout);

	conn = accept(s, (struct sockaddr *) &si_other, &slen);
	if (conn < 0)
	die("accept");

	if ((pid = fork()) < 0) {
	die("fork");
	} else if (pid == 0) {
	close(s);

	printf("Client connected: %s:%d\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));

	/* try to receive some data, this is a blocking call at child */
	recv_len = read(conn, buf, BUFLEN);
	if (recv_len < 0) {
	die("read");
	}

	/* print details of the client/peer and the data received */
	printf("Data: %s\n" , buf);

	if (strstr(buf, "GET")) {
	/* now reply the client with the same data */
	if (write(conn, http_ok, strlen(http_ok)) < 0) {
	die("write");
	}
	if (write(conn, page, strlen(page)) < 0) {
	die("write");
	}
	} else {
	if (write(conn, http_error, strlen(http_error)) < 0) {
	die("write");
	}
	}

	exit(0);
	}

	/* close the connection */
	close(conn);

	child++;
	while (child) {
	pid = waitpid((pid_t) -1, NULL, WNOHANG);
	if (pid < 0) {
	die("?");
	} else if (pid == 0) {
	break;
	} else {
	child--;
	}
	}
	}
	close(s);

	return 0;
	}