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/*
* Copyright (C) 2022 Amazon.com Inc. or its affiliates. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include "socket_utils.h"
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#ifdef __wasi__
#include <wasi_socket_ext.h>
#endif
#define MAX_CONNECTIONS_COUNT 5
static void
init_sockaddr_inet(struct sockaddr_in *addr)
{
/* 0.0.0.0:1234 */
addr->sin_family = AF_INET;
addr->sin_port = htons(1234);
addr->sin_addr.s_addr = htonl(INADDR_ANY);
}
static void
init_sockaddr_inet6(struct sockaddr_in6 *addr)
{
/* [::]:1234 */
addr->sin6_family = AF_INET6;
addr->sin6_port = htons(1234);
addr->sin6_addr = in6addr_any;
}
int
main(int argc, char *argv[])
{
int socket_fd = -1, af;
socklen_t addrlen = 0;
struct sockaddr_storage addr = { 0 };
char *reply_message = "Hello from server";
unsigned connections = 0;
char ip_string[64] = { 0 };
char buffer[1024] = { 0 };
if (argc > 1 && strcmp(argv[1], "inet6") == 0) {
af = AF_INET6;
addrlen = sizeof(struct sockaddr_in6);
init_sockaddr_inet6((struct sockaddr_in6 *)&addr);
}
else {
af = AF_INET;
addrlen = sizeof(struct sockaddr_in);
init_sockaddr_inet((struct sockaddr_in *)&addr);
}
printf("[Server] Create socket\n");
socket_fd = socket(af, SOCK_DGRAM, 0);
if (socket_fd < 0) {
perror("Create socket failed");
goto fail;
}
printf("[Server] Bind socket\n");
if (bind(socket_fd, (struct sockaddr *)&addr, addrlen) < 0) {
perror("Bind failed");
goto fail;
}
printf("[Server] Wait for clients to connect ..\n");
while (connections < MAX_CONNECTIONS_COUNT) {
addrlen = sizeof(addr);
/* make sure there is space for the string terminator */
int ret = recvfrom(socket_fd, buffer, sizeof(buffer) - 1, 0,
(struct sockaddr *)&addr, &addrlen);
if (ret < 0) {
perror("Read failed");
goto fail;
}
buffer[ret] = '\0';
if (sockaddr_to_string((struct sockaddr *)&addr, ip_string,
sizeof(ip_string) / sizeof(ip_string[0]))
!= 0) {
printf("[Server] failed to parse client address\n");
goto fail;
}
printf("[Server] received %d bytes from %s: %s\n", ret, ip_string,
buffer);
if (sendto(socket_fd, reply_message, strlen(reply_message), 0,
(struct sockaddr *)&addr, addrlen)
< 0) {
perror("Send failed");
break;
}
connections++;
}
if (connections == MAX_CONNECTIONS_COUNT) {
printf("[Server] Achieve maximum amount of connections\n");
}
printf("[Server] Shuting down ..\n");
shutdown(socket_fd, SHUT_RDWR);
close(socket_fd);
sleep(3);
printf("[Server] BYE \n");
return EXIT_SUCCESS;
fail:
printf("[Server] Shuting down ..\n");
if (socket_fd >= 0)
close(socket_fd);
sleep(3);
return EXIT_FAILURE;
}
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