8a4ef3e67a
The sample enables CONFIG_NET_IPV4_MAPPING_TO_IPV6 and then turns off IPV6_V6ONLY option which allows it to support both IPv6 and IPv4 using the same socket. Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
119 lines
2.3 KiB
C
119 lines
2.3 KiB
C
/*
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* Copyright (c) 2017 Linaro Limited
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifndef __ZEPHYR__
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#else
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#include <zephyr/net/socket.h>
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#include <zephyr/kernel.h>
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#endif
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#define BIND_PORT 4242
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int main(void)
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{
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int opt, optlen = sizeof(int);
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int serv, ret;
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struct sockaddr_in6 bind_addr = {
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.sin6_family = AF_INET6,
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.sin6_addr = IN6ADDR_ANY_INIT,
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.sin6_port = htons(BIND_PORT),
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};
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static int counter;
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serv = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
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if (serv < 0) {
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printf("error: socket: %d\n", errno);
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exit(1);
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}
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ret = getsockopt(serv, IPPROTO_IPV6, IPV6_V6ONLY, &opt, &optlen);
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if (ret == 0) {
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if (opt) {
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printf("IPV6_V6ONLY option is on, turning it off.\n");
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opt = 0;
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ret = setsockopt(serv, IPPROTO_IPV6, IPV6_V6ONLY,
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&opt, optlen);
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if (ret < 0) {
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printf("Cannot turn off IPV6_V6ONLY option\n");
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} else {
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printf("Sharing same socket between IPv6 and IPv4\n");
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}
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}
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}
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if (bind(serv, (struct sockaddr *)&bind_addr, sizeof(bind_addr)) < 0) {
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printf("error: bind: %d\n", errno);
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exit(1);
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}
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if (listen(serv, 5) < 0) {
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printf("error: listen: %d\n", errno);
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exit(1);
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}
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printf("Single-threaded TCP echo server waits for a connection on "
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"port %d...\n", BIND_PORT);
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while (1) {
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struct sockaddr_in6 client_addr;
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socklen_t client_addr_len = sizeof(client_addr);
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char addr_str[32];
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int client = accept(serv, (struct sockaddr *)&client_addr,
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&client_addr_len);
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if (client < 0) {
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printf("error: accept: %d\n", errno);
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continue;
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}
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inet_ntop(client_addr.sin6_family, &client_addr.sin6_addr,
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addr_str, sizeof(addr_str));
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printf("Connection #%d from %s\n", counter++, addr_str);
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while (1) {
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char buf[128], *p;
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int len = recv(client, buf, sizeof(buf), 0);
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int out_len;
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if (len <= 0) {
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if (len < 0) {
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printf("error: recv: %d\n", errno);
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}
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break;
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}
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p = buf;
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do {
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out_len = send(client, p, len, 0);
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if (out_len < 0) {
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printf("error: send: %d\n", errno);
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goto error;
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}
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p += out_len;
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len -= out_len;
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} while (len);
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}
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error:
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close(client);
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printf("Connection from %s closed\n", addr_str);
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}
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return 0;
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}
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