Notes

// #include <stdio.h>
// #include <sys/socket.h>
// #include <arpa/inet.h> //inet_addr

#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>

#define eradsf "afd"
#define response_404 "HTTP/1.1 404 Not Foundn"
#define response_200 "HTTP/1.1 200 OKnn"
int bufsize = 1024;

void reuse_socket(int socket_fd)
{
int so_reuseaddr = 1;

setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR,
&so_reuseaddr,
sizeof so_reuseaddr);
}

int create_socket()
{
int socket_;
if ((socket_ = socket(AF_INET, SOCK_STREAM, 0)) > 0)
{
printf("The socket was createdn");
}
return socket_;
}

struct sockaddr_in create_address(int port)
{
struct sockaddr_in address;

address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(port);
return address;
}

void bind_and_show_errors(int listen_socket, struct sockaddr_in address)
{
int bind_result = bind(listen_socket, (struct sockaddr *)&address, sizeof(address));
if (bind_result == 0)
{
printf("Bound Socketn");
}
else
{
printf("Bad bind: %dn", bind_result);
}
printf("Bind finishedn");
}

void respond(char *buffer, char *response)
{
printf("responding to: %sn", buffer);

char *token[2];
token[0] = strtok(buffer, " tn");
printf("token: %sn", token[0]);
token[1] = strtok(NULL, " t");
printf("token: %sn", token[1]);

if (strncmp("/exec", token[1], 5) != 0)
{
strcpy(response, response_404);
}
else
{
strcpy(response, response_200);
strcat(response, "We got thisnn");
}
printf("response is:n %s", response);
}

int server(int port)
{
int listen_socket;
listen_socket = create_socket();
reuse_socket(listen_socket);

struct sockaddr_in address = create_address(port);
bind_and_show_errors(listen_socket, address);
if (listen(listen_socket, 10) < 0)
{
perror("server: listen");
exit(1);
};

socklen_t addrlen;
int new_socket;
char *buffer = malloc(bufsize);
char *response = malloc(bufsize * 10);
while (1)
{
if ((new_socket = accept(listen_socket, (struct sockaddr *)&address, &addrlen)) < 0)
{
perror("server: accept");
exit(1);
}

if (new_socket > 0)
{
printf("The Client is connected...n");
}

recv(new_socket, buffer, bufsize, 0);
respond(buffer, response);
write(new_socket, response, strlen(response));
shutdown(new_socket, SHUT_RDWR);
close(new_socket);
// close(listen_socket);
}
return 0;
}

int main(int argc, char *argv[])
{
int port = atoi(argv[1]);
printf("Listenning on port %dn", port);
return server(8888);
}