pranavgade20/server.c

## server.c
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#define PORT 8080

int main(int argc, char const *argv[])
{
	struct sockaddr_in address;
	int addrlen = sizeof(address);

    // Creating socket file descriptor
    int server_socket_fd = socket(AF_INET, SOCK_STREAM, 0); // 0 is for the default protocol
    if (server_socket_fd == 0)
    {
    	perror("Error creating the server socket.\n");
    	exit(EXIT_FAILURE);
    }

    int opt = 1;
    if (setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt)))
    {
    	char err[100];
    	sprintf(err, "Error number: %d\n", errno);
    	perror(err);
    	exit(EXIT_FAILURE);
    }

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons( PORT );
    // attaching socket to the port 8080
    if (bind(server_socket_fd, (struct sockaddr *)&address, sizeof(address)) < 0)
    {
    	perror("bind failed");
    	exit(EXIT_FAILURE);
    }
    if (listen(server_socket_fd, 3) < 0)
    {
    	perror("cannot listen");
    	exit(EXIT_FAILURE);
    }

    printf("Listening for connections on port: %d\n", PORT);
    while(1)
    {
    	int client_socket = accept(server_socket_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);
    	if (client_socket < 0)
    	{
    		perror("could not accept client socket");
    		exit(EXIT_FAILURE);
    	}
		char buffer[1024] = {0};
    	read(client_socket, buffer, 1024);
    	char * line = strtok(buffer, "\r\n");
    	strtok(line, " ");
    	char * req_addr = strtok(NULL, " ");
    	printf("Requested: %s\n", req_addr);
    	if (req_addr[0] == '/' && req_addr[1] == '\0')
    	{
	    	char * response = "HTTP/1.1 200 OK\r\nConnection: close\r\n\r\n<html> <body> Hlo! What is your name? <form method=\"get\" action=\"/name\"><input type=\"text\" name=\"q\"><button type=\"submit\">Submit</button></form></body></html>\r\n\r\n"; // maybe replace with CLRF
    		send(client_socket , response , strlen(response) , 0);
    	} else if (!strncmp("/name", req_addr, strlen("/name")))
    	{
    		strtok(req_addr, "=");
    		char * name = strtok(NULL, " ");
	    	char * response = "HTTP/1.1 200 OK\r\nConnection: close\r\n\r\nHello, "; // maybe replace with CLRF
    		send(client_socket , response , strlen(response) , 0);
    		send(client_socket , name , strlen(name) , 0);
    		send(client_socket , "\r\n\r\n", strlen("\r\n\r\n"), 0);
    	} else
    	{
	    	char * response = "HTTP/1.1 404\r\nConnection: close\r\n\r\nErr: requested address not found\r\n\r\n"; // maybe replace with CLRF
    		send(client_socket , response , strlen(response) , 0);
    	}

    	if (close(client_socket))
    	{
    		char err[100];
    		sprintf(err, "Error number: %d\n", errno);
    		perror(err);
    	}

    	printf("Response message sent\n");
    }
    return 0;
}
	#include <stdio.h>
	#include <unistd.h>
	#include <sys/socket.h>
	#include <stdlib.h>
	#include <netinet/in.h>
	#include <string.h>
	#include <errno.h>
	#define PORT 8080

	int main(int argc, char const *argv[])
	{
	struct sockaddr_in address;
	int addrlen = sizeof(address);

	// Creating socket file descriptor
	int server_socket_fd = socket(AF_INET, SOCK_STREAM, 0); // 0 is for the default protocol
	if (server_socket_fd == 0)
	{
	perror("Error creating the server socket.\n");
	exit(EXIT_FAILURE);
	}

	int opt = 1;
	if (setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR \| SO_REUSEPORT, &opt, sizeof(opt)))
	{
	char err[100];
	sprintf(err, "Error number: %d\n", errno);
	perror(err);
	exit(EXIT_FAILURE);
	}

	address.sin_family = AF_INET;
	address.sin_addr.s_addr = INADDR_ANY;
	address.sin_port = htons( PORT );
	// attaching socket to the port 8080
	if (bind(server_socket_fd, (struct sockaddr *)&address, sizeof(address)) < 0)
	{
	perror("bind failed");
	exit(EXIT_FAILURE);
	}
	if (listen(server_socket_fd, 3) < 0)
	{
	perror("cannot listen");
	exit(EXIT_FAILURE);
	}

	printf("Listening for connections on port: %d\n", PORT);
	while(1)
	{
	int client_socket = accept(server_socket_fd, (struct sockaddr )&address, (socklen_t)&addrlen);
	if (client_socket < 0)
	{
	perror("could not accept client socket");
	exit(EXIT_FAILURE);
	}
	char buffer[1024] = {0};
	read(client_socket, buffer, 1024);
	char * line = strtok(buffer, "\r\n");
	strtok(line, " ");
	char * req_addr = strtok(NULL, " ");
	printf("Requested: %s\n", req_addr);
	if (req_addr[0] == '/' && req_addr[1] == '\0')
	{
	char * response = "HTTP/1.1 200 OK\r\nConnection: close\r\n\r\n<html> <body> Hlo! What is your name? <form method=\"get\" action=\"/name\"><input type=\"text\" name=\"q\"><button type=\"submit\">Submit</button></form></body></html>\r\n\r\n"; // maybe replace with CLRF
	send(client_socket , response , strlen(response) , 0);
	} else if (!strncmp("/name", req_addr, strlen("/name")))
	{
	strtok(req_addr, "=");
	char * name = strtok(NULL, " ");
	char * response = "HTTP/1.1 200 OK\r\nConnection: close\r\n\r\nHello, "; // maybe replace with CLRF
	send(client_socket , response , strlen(response) , 0);
	send(client_socket , name , strlen(name) , 0);
	send(client_socket , "\r\n\r\n", strlen("\r\n\r\n"), 0);
	} else
	{
	char * response = "HTTP/1.1 404\r\nConnection: close\r\n\r\nErr: requested address not found\r\n\r\n"; // maybe replace with CLRF
	send(client_socket , response , strlen(response) , 0);
	}

	if (close(client_socket))
	{
	char err[100];
	sprintf(err, "Error number: %d\n", errno);
	perror(err);
	}

	printf("Response message sent\n");
	}
	return 0;
	}