Server Library in C

Understanding Sockets

The basic code to start a socket server in C is as follows.

#include <stdio.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #define SERVER_PORT 2000 int main(){ int listenfd; struct sockaddr_in servaddr; listenfd = socket(AF_INET, SOCK_STREAM, 0); bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(SERVER_PORT); bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr)); listen(listenfd, 12); printf("Listening on port %d\n\n", SERVER_PORT); int connection_socket; char buff[4096]; connection_socket = accept(listenfd, (struct sockaddr*)NULL, NULL); printf("\t----REQUEST BEGINNING----\n\n"); snprintf(buff, sizeof(buff), "HTTP/1.1 200 OK\r\n\r\n%s", "yeet"); write(connection_socket, buff, strlen(buff)); printf("\n\t----REQUEST END----\n\n"); close(connection_socket); close(listenfd); }

My Library

On top of this basic method of listening to a linux socket I build a library that allows you to register and handle routes.

#include <string.h> int request_count = 0; void route_root(Request req, Response* res){ send_file(res, "./public/index.html"); } void counter(Request req, Response* res){ char sendable[34]; sprintf(sendable, "<h1><h1>count: %d</h1></h1>", request_count); send_txt(res, sendable); request_count += 1; } void route_404 (Request req, Response* res){ char message[50] = "<h1>404 Route \""; char* endofmessage = "\" not found :(</h1>"; strcat(message, req.url); strcat(message, endofmessage); send_txt(res, message); } Route routes[] = { {"/", route_root}, {"/counter", counter}, {"/404", route_404} };