esp-idf/components/tcp_transport/transport_tcp.c

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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdlib.h>
#include <string.h>
#include "lwip/sockets.h"
#include "lwip/dns.h"
#include "lwip/netdb.h"
#include "esp_log.h"
#include "esp_system.h"
#include "esp_err.h"
#include "esp_transport_utils.h"
#include "esp_transport.h"
static const char *TAG = "TRANS_TCP";
typedef struct {
int sock;
} transport_tcp_t;
static int resolve_dns(const char *host, struct sockaddr_in *ip) {
struct hostent *he;
struct in_addr **addr_list;
he = gethostbyname(host);
if (he == NULL) {
return ESP_FAIL;
}
addr_list = (struct in_addr **)he->h_addr_list;
if (addr_list[0] == NULL) {
return ESP_FAIL;
}
ip->sin_family = AF_INET;
memcpy(&ip->sin_addr, addr_list[0], sizeof(ip->sin_addr));
return ESP_OK;
}
static int tcp_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
{
struct sockaddr_in remote_ip;
struct timeval tv;
transport_tcp_t *tcp = esp_transport_get_context_data(t);
bzero(&remote_ip, sizeof(struct sockaddr_in));
//if stream_host is not ip address, resolve it AF_INET,servername,&serveraddr.sin_addr
if (inet_pton(AF_INET, host, &remote_ip.sin_addr) != 1) {
if (resolve_dns(host, &remote_ip) < 0) {
return -1;
}
}
tcp->sock = socket(PF_INET, SOCK_STREAM, 0);
if (tcp->sock < 0) {
ESP_LOGE(TAG, "Error create socket");
return -1;
}
remote_ip.sin_family = AF_INET;
remote_ip.sin_port = htons(port);
esp_transport_utils_ms_to_timeval(timeout_ms, &tv);
setsockopt(tcp->sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
setsockopt(tcp->sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
ESP_LOGD(TAG, "[sock=%d],connecting to server IP:%s,Port:%d...",
tcp->sock, ipaddr_ntoa((const ip_addr_t*)&remote_ip.sin_addr.s_addr), port);
if (connect(tcp->sock, (struct sockaddr *)(&remote_ip), sizeof(struct sockaddr)) != 0) {
close(tcp->sock);
tcp->sock = -1;
return -1;
}
return tcp->sock;
}
static int tcp_write(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms)
{
int poll;
transport_tcp_t *tcp = esp_transport_get_context_data(t);
if ((poll = esp_transport_poll_write(t, timeout_ms)) <= 0) {
return poll;
}
return write(tcp->sock, buffer, len);
}
static int tcp_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
{
transport_tcp_t *tcp = esp_transport_get_context_data(t);
int poll = -1;
if ((poll = esp_transport_poll_read(t, timeout_ms)) <= 0) {
return poll;
}
int read_len = read(tcp->sock, buffer, len);
if (read_len == 0) {
return -1;
}
return read_len;
}
static int tcp_poll_read(esp_transport_handle_t t, int timeout_ms)
{
transport_tcp_t *tcp = esp_transport_get_context_data(t);
int ret = -1;
fd_set readset;
fd_set errset;
FD_ZERO(&readset);
FD_ZERO(&errset);
FD_SET(tcp->sock, &readset);
FD_SET(tcp->sock, &errset);
struct timeval timeout;
esp_transport_utils_ms_to_timeval(timeout_ms, &timeout);
ret = select(tcp->sock + 1, &readset, NULL, &errset, &timeout);
if (ret > 0 && FD_ISSET(tcp->sock, &errset)) {
int sock_errno = 0;
uint32_t optlen = sizeof(sock_errno);
getsockopt(tcp->sock, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
ESP_LOGE(TAG, "tcp_poll_read select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), tcp->sock);
ret = -1;
}
return ret;
}
static int tcp_poll_write(esp_transport_handle_t t, int timeout_ms)
{
transport_tcp_t *tcp = esp_transport_get_context_data(t);
int ret = -1;
fd_set writeset;
fd_set errset;
FD_ZERO(&writeset);
FD_ZERO(&errset);
FD_SET(tcp->sock, &writeset);
FD_SET(tcp->sock, &errset);
struct timeval timeout;
esp_transport_utils_ms_to_timeval(timeout_ms, &timeout);
ret = select(tcp->sock + 1, NULL, &writeset, &errset, &timeout);
if (ret > 0 && FD_ISSET(tcp->sock, &errset)) {
int sock_errno = 0;
uint32_t optlen = sizeof(sock_errno);
getsockopt(tcp->sock, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
ESP_LOGE(TAG, "tcp_poll_write select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), tcp->sock);
ret = -1;
}
return ret;
}
static int tcp_close(esp_transport_handle_t t)
{
transport_tcp_t *tcp = esp_transport_get_context_data(t);
int ret = -1;
if (tcp->sock >= 0) {
ret = close(tcp->sock);
tcp->sock = -1;
}
return ret;
}
static esp_err_t tcp_destroy(esp_transport_handle_t t)
{
transport_tcp_t *tcp = esp_transport_get_context_data(t);
esp_transport_close(t);
free(tcp);
return 0;
}
esp_transport_handle_t esp_transport_tcp_init(void)
{
esp_transport_handle_t t = esp_transport_init();
transport_tcp_t *tcp = calloc(1, sizeof(transport_tcp_t));
ESP_TRANSPORT_MEM_CHECK(TAG, tcp, return NULL);
tcp->sock = -1;
esp_transport_set_func(t, tcp_connect, tcp_read, tcp_write, tcp_close, tcp_poll_read, tcp_poll_write, tcp_destroy);
esp_transport_set_context_data(t, tcp);
return t;
}