cs-3516-assignment-1/server/socket_server.c

#include "socket_server.h"
#include "../common/http_types.h"
#include "../common/socket_helper.h"
#include <math.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

/**
 * Gets the address info for the given port, such that the server will listen on 0.0.0.
 *
 * @param port The port to listen on.
 * @param info A pointer to a location where getaddrinfo can store data.
 *
 * @return The result of getaddrinfo. See `man getaddrinfo` for details.
 */
static int build_addr_info(int port, struct addrinfo **info) {
    struct addrinfo hints = {.ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM};
    // Get the number of chars in the port
    int port_length = floor(log10(port)) + 1;
    char *port_string = malloc((port_length + 1) * sizeof(char));
    sprintf(port_string, "%d", port);

    int addr_status = getaddrinfo(NULL, port_string, &hints, info);
    free(port_string);

    return addr_status;
}

/**
 * Setup the server's socket for listening.
 *
 * @param port The port to listen on.
 *
 * @return A server_info representing the result of setting up the socket.
 */
struct server_info setup(int port) {
    struct server_info info = {.sock_fd = -1};
    struct addrinfo *addr_info;
    int addr_status = build_addr_info(port, &addr_info);
    if (addr_status != 0) {
        info.status = STATUS_ERROR;
        return info;
    }

    info.sock_fd = socket(addr_info->ai_family, addr_info->ai_socktype, addr_info->ai_protocol);
    if (info.sock_fd == -1) {
        info.status = STATUS_ERROR;
        return info;
    }

    int bind_result = bind(info.sock_fd, addr_info->ai_addr, addr_info->ai_addrlen);
    if (bind_result == -1) {
        close(info.sock_fd);
        info.sock_fd = -1;
        info.status = STATUS_ERROR;
        return info;
    }

    int listen_result = listen(info.sock_fd, 8); if (listen_result == -1) {
        close(info.sock_fd);
        info.sock_fd = -1;
        info.status = STATUS_ERROR;
        return info;
    }
    info.status = STATUS_LISTENING;

    return info;
}

enum socket_read_result serve_one_request(int sock_fd) {
    int client_fd = accept(sock_fd, NULL, NULL);
    if (client_fd == -1) {
        return RESULT_WRITE_ERROR;
    }
    struct http_message message = {};
    get_all_remote_parts(client_fd, TYPE_SERVER, &message);
    printf("%s\n", message.contents);
    char *msg = "HTTP/1.1 501 Not Imlemented Yet :(\r\n\r\n";
    send(client_fd, msg, strlen(msg), 0);
    shutdown(client_fd, SHUT_RDWR);
    close(client_fd);
    return RESULT_OK;
}