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/*
* Copyright (c) 2017 Intel Corporation.
* Copyright (c) 2018 Nordic Semiconductor ASA.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <logging/log.h>
LOG_MODULE_DECLARE(net_echo_client_sample, LOG_LEVEL_DBG);
#include <zephyr.h>
#include <errno.h>
#include <stdio.h>
#include <net/socket.h>
#include <net/tls_credentials.h>
#include "common.h"
#include "ca_certificate.h"
#define RECV_BUF_SIZE 128
/* These proxy server addresses are only used when CONFIG_SOCKS
* is enabled. To connect to a proxy server that is not running
* under the same IP as the peer or uses a different port number,
* modify the values.
*/
#define SOCKS5_PROXY_V6_ADDR CONFIG_NET_CONFIG_PEER_IPV6_ADDR
#define SOCKS5_PROXY_V4_ADDR CONFIG_NET_CONFIG_PEER_IPV4_ADDR
#define SOCKS5_PROXY_PORT 1080
static ssize_t sendall(int sock, const void *buf, size_t len)
{
while (len) {
ssize_t out_len = send(sock, buf, len, 0);
if (out_len < 0) {
return out_len;
}
buf = (const char *)buf + out_len;
len -= out_len;
}
return 0;
}
static int send_tcp_data(struct data *data)
{
int ret;
do {
data->tcp.expecting = sys_rand32_get() % ipsum_len;
} while (data->tcp.expecting == 0U);
data->tcp.received = 0U;
ret = sendall(data->tcp.sock, lorem_ipsum, data->tcp.expecting);
if (ret < 0) {
LOG_ERR("%s TCP: Failed to send data, errno %d", data->proto,
errno);
} else {
LOG_DBG("%s TCP: Sent %d bytes", data->proto,
data->tcp.expecting);
}
return ret;
}
static int compare_tcp_data(struct data *data, const char *buf, u32_t received)
{
if (data->tcp.received + received > data->tcp.expecting) {
LOG_ERR("Too much data received: TCP %s", data->proto);
return -EIO;
}
if (memcmp(buf, lorem_ipsum + data->tcp.received, received) != 0) {
LOG_ERR("Invalid data received: TCP %s", data->proto);
return -EIO;
}
return 0;
}
static int start_tcp_proto(struct data *data, struct sockaddr *addr,
socklen_t addrlen)
{
int ret;
#if defined(CONFIG_NET_SOCKETS_SOCKOPT_TLS)
data->tcp.sock = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TLS_1_2);
#else
data->tcp.sock = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
#endif
if (data->tcp.sock < 0) {
LOG_ERR("Failed to create TCP socket (%s): %d", data->proto,
errno);
return -errno;
}
if (IS_ENABLED(CONFIG_SOCKS)) {
struct sockaddr proxy_addr;
socklen_t proxy_addrlen;
if (addr->sa_family == AF_INET) {
struct sockaddr_in *proxy4 =
(struct sockaddr_in *)&proxy_addr;
proxy4->sin_family = AF_INET;
proxy4->sin_port = htons(SOCKS5_PROXY_PORT);
inet_pton(AF_INET, SOCKS5_PROXY_V4_ADDR,
&proxy4->sin_addr);
proxy_addrlen = sizeof(struct sockaddr_in);
} else if (addr->sa_family == AF_INET6) {
struct sockaddr_in6 *proxy6 =
(struct sockaddr_in6 *)&proxy_addr;
proxy6->sin6_family = AF_INET6;
proxy6->sin6_port = htons(SOCKS5_PROXY_PORT);
inet_pton(AF_INET6, SOCKS5_PROXY_V6_ADDR,
&proxy6->sin6_addr);
proxy_addrlen = sizeof(struct sockaddr_in6);
} else {
return -EINVAL;
}
ret = setsockopt(data->tcp.sock, SOL_SOCKET, SO_SOCKS5,
&proxy_addr, proxy_addrlen);
if (ret < 0) {
return ret;
}
}
#if defined(CONFIG_NET_SOCKETS_SOCKOPT_TLS)
sec_tag_t sec_tag_list[] = {
CA_CERTIFICATE_TAG,
#if defined(CONFIG_MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
PSK_TAG,
#endif
};
ret = setsockopt(data->tcp.sock, SOL_TLS, TLS_SEC_TAG_LIST,
sec_tag_list, sizeof(sec_tag_list));
if (ret < 0) {
LOG_ERR("Failed to set TLS_SEC_TAG_LIST option (%s): %d",
data->proto, errno);
ret = -errno;
}
ret = setsockopt(data->tcp.sock, SOL_TLS, TLS_HOSTNAME,
TLS_PEER_HOSTNAME, sizeof(TLS_PEER_HOSTNAME));
if (ret < 0) {
LOG_ERR("Failed to set TLS_HOSTNAME option (%s): %d",
data->proto, errno);
ret = -errno;
}
#endif
ret = connect(data->tcp.sock, addr, addrlen);
if (ret < 0) {
LOG_ERR("Cannot connect to TCP remote (%s): %d", data->proto,
errno);
ret = -errno;
}
return ret;
}
static int process_tcp_proto(struct data *data)
{
int ret, received;
char buf[RECV_BUF_SIZE];
do {
received = recv(data->tcp.sock, buf, sizeof(buf), MSG_DONTWAIT);
/* No data or error. */
if (received == 0) {
ret = -EIO;
continue;
} else if (received < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
ret = 0;
} else {
ret = -errno;
}
continue;
}
ret = compare_tcp_data(data, buf, received);
if (ret != 0) {
break;
}
/* Successful comparison. */
data->tcp.received += received;
if (data->tcp.received < data->tcp.expecting) {
continue;
}
/* Response complete */
LOG_DBG("%s TCP: Received and compared %d bytes, all ok",
data->proto, data->tcp.received);
if (++data->tcp.counter % 1000 == 0U) {
LOG_INF("%s TCP: Exchanged %u packets", data->proto,
data->tcp.counter);
}
ret = send_tcp_data(data);
break;
} while (received > 0);
return ret;
}
int start_tcp(void)
{
int ret = 0;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
if (IS_ENABLED(CONFIG_NET_IPV6)) {
addr6.sin6_family = AF_INET6;
addr6.sin6_port = htons(PEER_PORT);
inet_pton(AF_INET6, CONFIG_NET_CONFIG_PEER_IPV6_ADDR,
&addr6.sin6_addr);
ret = start_tcp_proto(&conf.ipv6, (struct sockaddr *)&addr6,
sizeof(addr6));
if (ret < 0) {
return ret;
}
}
if (IS_ENABLED(CONFIG_NET_IPV4)) {
addr4.sin_family = AF_INET;
addr4.sin_port = htons(PEER_PORT);
inet_pton(AF_INET, CONFIG_NET_CONFIG_PEER_IPV4_ADDR,
&addr4.sin_addr);
ret = start_tcp_proto(&conf.ipv4, (struct sockaddr *)&addr4,
sizeof(addr4));
if (ret < 0) {
return ret;
}
}
if (IS_ENABLED(CONFIG_NET_IPV6)) {
ret = send_tcp_data(&conf.ipv6);
if (ret < 0) {
return ret;
}
}
if (IS_ENABLED(CONFIG_NET_IPV4)) {
ret = send_tcp_data(&conf.ipv4);
}
return ret;
}
int process_tcp(void)
{
int ret = 0;
if (IS_ENABLED(CONFIG_NET_IPV6)) {
ret = process_tcp_proto(&conf.ipv6);
if (ret < 0) {
return ret;
}
}
if (IS_ENABLED(CONFIG_NET_IPV4)) {
ret = process_tcp_proto(&conf.ipv4);
if (ret < 0) {
return ret;
}
}
return ret;
}
void stop_tcp(void)
{
if (IS_ENABLED(CONFIG_NET_IPV6)) {
if (conf.ipv6.tcp.sock >= 0) {
(void)close(conf.ipv6.tcp.sock);
}
}
if (IS_ENABLED(CONFIG_NET_IPV4)) {
if (conf.ipv4.tcp.sock >= 0) {
(void)close(conf.ipv4.tcp.sock);
}
}
}
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