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