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server.c
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195 lines (165 loc) · 4.25 KB
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#include <assert.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <poll.h>
#include "http_handler.h"
#include "my_socket.h"
#include "request.h"
#include "response.h"
#define MAX_REQUEST_SIZE 2048
#define MAX_CLIENTS 10
#define POLL_TIMEOUT 5000 // 5 seconds
char *wait_for_client_request(int client_fd, size_t *nrecv);
int handle_new_connection(int server_fd, struct pollfd *fds, int *nfds);
void handle_client_request(struct pollfd *pfd);
static void print_http_request(http_request *request)
{
printf("Method: %s\n", http_methods[request->request_line.method].name);
printf("URI: %s\n", request->request_line.uri);
printf("Version: %s\n", request->request_line.version);
printf("Header count: %d\n", request->header_count);
for (int i = 0; i < request->header_count; i++)
{
printf("Header %d: %s: %s\n", i, request->headers[i].name, request->headers[i].value);
}
printf("Body: %s\n", request->body);
}
static void initialize_server(void);
static int setup_server(void);
static void run_server_loop(int server_fd, struct pollfd *fds, int *nfds);
static void cleanup_server(int server_fd);
int main(int argc, char *argv[])
{
initialize_server();
int server_fd = setup_server();
if (server_fd == -1)
return 1;
struct pollfd fds[MAX_CLIENTS + 1];
int nfds = 1;
fds[0].fd = server_fd;
fds[0].events = POLLIN;
run_server_loop(server_fd, fds, &nfds);
cleanup_server(server_fd);
return 0;
}
static void initialize_server(void)
{
setbuf(stdout, NULL);
setbuf(stderr, NULL);
}
static int setup_server(void)
{
return init_server();
}
static void run_server_loop(int server_fd, struct pollfd *fds, int *nfds)
{
while (1)
{
int poll_count = poll(fds, *nfds, POLL_TIMEOUT);
if (poll_count == -1)
{
perror("poll");
break;
}
if (poll_count == 0)
continue;
for (int i = 0; i < *nfds; i++)
{
if (fds[i].revents & POLLIN)
{
if (fds[i].fd == server_fd)
{
if (handle_new_connection(server_fd, fds, nfds) == -1)
return;
}
else
{
handle_client_request(&fds[i]);
}
}
}
}
}
static void cleanup_server(int server_fd)
{
close(server_fd);
}
int handle_new_connection(int server_fd, struct pollfd *fds, int *nfds)
{
int client_fd = accept_client(server_fd);
if (client_fd == -1)
return -1;
if (*nfds < MAX_CLIENTS + 1)
{
fds[*nfds].fd = client_fd;
fds[*nfds].events = POLLIN;
(*nfds)++;
}
else
{
fprintf(stderr, "Too many clients. Connection rejected.\n");
close(client_fd);
}
return 0;
}
void handle_client_request(struct pollfd *pfd)
{
http_request request;
size_t nrecv = 0;
char *client_request = wait_for_client_request(pfd->fd, &nrecv);
if (client_request == NULL)
{
close(pfd->fd);
pfd->fd = -1;
return;
}
if (parse_http_request(client_request, nrecv, &request) == -1)
{
free(client_request);
close(pfd->fd);
pfd->fd = -1;
return;
}
#ifdef DEBUG
print_http_request(&request);
#endif // DEBUG
handle_request(&request, pfd->fd);
free(client_request);
}
char *wait_for_client_request(int client_fd, size_t *nrecv)
{
char *buffer = (char *)malloc(MAX_REQUEST_SIZE);
if (!buffer)
{
fprintf(stderr, "Failed to allocate memory for client request buffer.\n");
return NULL;
}
ssize_t n = recv(client_fd, buffer, MAX_REQUEST_SIZE, 0);
if (n == -1)
{
if (errno == ECONNRESET)
{
fprintf(stderr, "Connection reset by peer.\n");
}
else
{
perror("Failed to receive data from client");
}
free(buffer);
return NULL;
}
if (n == 0)
{
fprintf(stderr, "Client closed the connection.\n");
free(buffer);
return NULL;
}
*nrecv = n;
return buffer;
}