reproducer.c

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

#define handle_error(msg)                                                      \
  do {                                                                         \
    perror(msg);                                                               \
    exit(EXIT_FAILURE);                                                        \
  } while (0)

int main(int argc, char **argv) {
  int server_fd, client_fd;
  struct sockaddr_in server_addr = {0}, client_addr;
  socklen_t client_addr_size;
  int yes = 1;

  char buffer[10240];
  ssize_t bytes;
  size_t i;

  const char response[] = "HTTP/1.1 200 Ok\r\n"
                          "Connection: keep-alive\r\n"
                          "Transfer-Encoding: chunked\r\n"
                          "\r\n"
                          "a\r\n"
                          "0123456789\r\n"
                          "0\r\n"
                          "\r\n";

  server_fd = socket(AF_INET, SOCK_STREAM, 0);
  if (server_fd == -1)
    handle_error("socket");
  setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));

  server_addr.sin_family = AF_INET;
  server_addr.sin_addr.s_addr = INADDR_ANY;
  server_addr.sin_port = htons(8080);

  if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) ==
      -1)
    handle_error("bind");

  if (listen(server_fd, 10) == -1)
    handle_error("listen");

again:

  client_addr_size = sizeof(client_addr);
  client_fd =
      accept(server_fd, (struct sockaddr *)&client_addr, &client_addr_size);
  if (client_fd == -1)
    handle_error("accept");

  bytes = read(client_fd, buffer, sizeof(buffer));
  if (bytes < 0)
    handle_error("read");
  if (bytes == 0) {
    close(client_fd);
    goto again;
  }

  if (write(client_fd, response, strlen(response)) < 0)
    handle_error("write");

  bytes = read(client_fd, buffer, sizeof(buffer));
  if (bytes < 0)
    handle_error("read");

  close(client_fd);
  goto again;
}