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311 lines
10 KiB
C
311 lines
10 KiB
C
// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdlib.h>
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#include <string.h>
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#include "lwip/sockets.h"
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#include "lwip/dns.h"
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#include "lwip/netdb.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "esp_err.h"
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#include "esp_transport_utils.h"
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#include "esp_transport.h"
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#include "esp_transport_internal.h"
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static const char *TAG = "TRANS_TCP";
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typedef struct {
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int sock;
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} transport_tcp_t;
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static int resolve_dns(const char *host, struct sockaddr_in *ip)
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{
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const struct addrinfo hints = {
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.ai_family = AF_INET,
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.ai_socktype = SOCK_STREAM,
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};
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struct addrinfo *res;
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int err = getaddrinfo(host, NULL, &hints, &res);
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if(err != 0 || res == NULL) {
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ESP_LOGE(TAG, "DNS lookup failed err=%d res=%p", err, res);
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return ESP_FAIL;
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}
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ip->sin_family = AF_INET;
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memcpy(&ip->sin_addr, &((struct sockaddr_in *)(res->ai_addr))->sin_addr, sizeof(ip->sin_addr));
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freeaddrinfo(res);
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return ESP_OK;
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}
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static int tcp_enable_keep_alive(int fd, esp_transport_keep_alive_t *keep_alive_cfg)
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{
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int keep_alive_enable = 1;
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int keep_alive_idle = keep_alive_cfg->keep_alive_idle;
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int keep_alive_interval = keep_alive_cfg->keep_alive_interval;
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int keep_alive_count = keep_alive_cfg->keep_alive_count;
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ESP_LOGD(TAG, "Enable TCP keep alive. idle: %d, interval: %d, count: %d", keep_alive_idle, keep_alive_interval, keep_alive_count);
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if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &keep_alive_enable, sizeof(keep_alive_enable)) != 0) {
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ESP_LOGE(TAG, "Fail to setsockopt SO_KEEPALIVE");
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return -1;
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}
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if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &keep_alive_idle, sizeof(keep_alive_idle)) != 0) {
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ESP_LOGE(TAG, "Fail to setsockopt TCP_KEEPIDLE");
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return -1;
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}
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if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &keep_alive_interval, sizeof(keep_alive_interval)) != 0) {
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ESP_LOGE(TAG, "Fail to setsockopt TCP_KEEPINTVL");
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return -1;
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}
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if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &keep_alive_count, sizeof(keep_alive_count)) != 0) {
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ESP_LOGE(TAG, "Fail to setsockopt TCP_KEEPCNT");
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return -1;
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}
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return 0;
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}
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static int tcp_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
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{
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struct sockaddr_in remote_ip;
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struct timeval tv = { 0 };
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transport_tcp_t *tcp = esp_transport_get_context_data(t);
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bzero(&remote_ip, sizeof(struct sockaddr_in));
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//if stream_host is not ip address, resolve it AF_INET,servername,&serveraddr.sin_addr
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if (inet_pton(AF_INET, host, &remote_ip.sin_addr) != 1) {
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if (resolve_dns(host, &remote_ip) < 0) {
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return -1;
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}
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}
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tcp->sock = socket(PF_INET, SOCK_STREAM, 0);
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if (tcp->sock < 0) {
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ESP_LOGE(TAG, "Error create socket");
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return -1;
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}
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remote_ip.sin_family = AF_INET;
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remote_ip.sin_port = htons(port);
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esp_transport_utils_ms_to_timeval(timeout_ms, &tv); // if timeout=-1, tv is unchanged, 0, i.e. waits forever
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setsockopt(tcp->sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
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setsockopt(tcp->sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
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// Set socket keep-alive option
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if (t->keep_alive_cfg && t->keep_alive_cfg->keep_alive_enable) {
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if (tcp_enable_keep_alive(tcp->sock, t->keep_alive_cfg) < 0) {
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ESP_LOGE(TAG, "Error to set tcp [socket=%d] keep-alive", tcp->sock);
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goto error;
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}
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}
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// Set socket to non-blocking
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int flags;
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if ((flags = fcntl(tcp->sock, F_GETFL, NULL)) < 0) {
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ESP_LOGE(TAG, "[sock=%d] get file flags error: %s", tcp->sock, strerror(errno));
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goto error;
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}
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if (fcntl(tcp->sock, F_SETFL, flags |= O_NONBLOCK) < 0) {
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ESP_LOGE(TAG, "[sock=%d] set nonblocking error: %s", tcp->sock, strerror(errno));
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goto error;
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}
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ESP_LOGD(TAG, "[sock=%d] Connecting to server. IP: %s, Port: %d",
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tcp->sock, ipaddr_ntoa((const ip_addr_t*)&remote_ip.sin_addr.s_addr), port);
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if (connect(tcp->sock, (struct sockaddr *)(&remote_ip), sizeof(struct sockaddr)) < 0) {
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if (errno == EINPROGRESS) {
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fd_set fdset;
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esp_transport_utils_ms_to_timeval(timeout_ms, &tv);
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FD_ZERO(&fdset);
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FD_SET(tcp->sock, &fdset);
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int res = select(tcp->sock+1, NULL, &fdset, NULL, &tv);
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if (res < 0) {
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ESP_LOGE(TAG, "[sock=%d] select() error: %s", tcp->sock, strerror(errno));
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esp_transport_capture_errno(t, errno);
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goto error;
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}
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else if (res == 0) {
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ESP_LOGE(TAG, "[sock=%d] select() timeout", tcp->sock);
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esp_transport_capture_errno(t, EINPROGRESS); // errno=EINPROGRESS indicates connection timeout
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goto error;
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} else {
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int sockerr;
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socklen_t len = (socklen_t)sizeof(int);
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if (getsockopt(tcp->sock, SOL_SOCKET, SO_ERROR, (void*)(&sockerr), &len) < 0) {
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ESP_LOGE(TAG, "[sock=%d] getsockopt() error: %s", tcp->sock, strerror(errno));
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goto error;
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}
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else if (sockerr) {
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esp_transport_capture_errno(t, sockerr);
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ESP_LOGE(TAG, "[sock=%d] delayed connect error: %s", tcp->sock, strerror(sockerr));
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goto error;
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}
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}
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} else {
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ESP_LOGE(TAG, "[sock=%d] connect() error: %s", tcp->sock, strerror(errno));
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goto error;
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}
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}
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// Reset socket to blocking
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if ((flags = fcntl(tcp->sock, F_GETFL, NULL)) < 0) {
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ESP_LOGE(TAG, "[sock=%d] get file flags error: %s", tcp->sock, strerror(errno));
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goto error;
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}
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if (fcntl(tcp->sock, F_SETFL, flags & ~O_NONBLOCK) < 0) {
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ESP_LOGE(TAG, "[sock=%d] reset blocking error: %s", tcp->sock, strerror(errno));
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goto error;
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}
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return tcp->sock;
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error:
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close(tcp->sock);
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tcp->sock = -1;
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return -1;
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}
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static int tcp_write(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms)
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{
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int poll;
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transport_tcp_t *tcp = esp_transport_get_context_data(t);
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if ((poll = esp_transport_poll_write(t, timeout_ms)) <= 0) {
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return poll;
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}
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return write(tcp->sock, buffer, len);
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}
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static int tcp_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
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{
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transport_tcp_t *tcp = esp_transport_get_context_data(t);
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int poll = -1;
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if ((poll = esp_transport_poll_read(t, timeout_ms)) <= 0) {
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return poll;
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}
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int read_len = read(tcp->sock, buffer, len);
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if (read_len == 0) {
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return -1;
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}
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return read_len;
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}
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static int tcp_poll_read(esp_transport_handle_t t, int timeout_ms)
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{
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transport_tcp_t *tcp = esp_transport_get_context_data(t);
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int ret = -1;
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struct timeval timeout;
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fd_set readset;
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fd_set errset;
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FD_ZERO(&readset);
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FD_ZERO(&errset);
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FD_SET(tcp->sock, &readset);
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FD_SET(tcp->sock, &errset);
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ret = select(tcp->sock + 1, &readset, NULL, &errset, esp_transport_utils_ms_to_timeval(timeout_ms, &timeout));
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if (ret > 0 && FD_ISSET(tcp->sock, &errset)) {
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int sock_errno = 0;
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uint32_t optlen = sizeof(sock_errno);
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getsockopt(tcp->sock, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
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esp_transport_capture_errno(t, sock_errno);
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ESP_LOGE(TAG, "tcp_poll_read select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), tcp->sock);
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ret = -1;
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}
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return ret;
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}
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static int tcp_poll_write(esp_transport_handle_t t, int timeout_ms)
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{
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transport_tcp_t *tcp = esp_transport_get_context_data(t);
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int ret = -1;
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struct timeval timeout;
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fd_set writeset;
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fd_set errset;
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FD_ZERO(&writeset);
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FD_ZERO(&errset);
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FD_SET(tcp->sock, &writeset);
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FD_SET(tcp->sock, &errset);
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ret = select(tcp->sock + 1, NULL, &writeset, &errset, esp_transport_utils_ms_to_timeval(timeout_ms, &timeout));
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if (ret > 0 && FD_ISSET(tcp->sock, &errset)) {
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int sock_errno = 0;
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uint32_t optlen = sizeof(sock_errno);
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getsockopt(tcp->sock, SOL_SOCKET, SO_ERROR, &sock_errno, &optlen);
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esp_transport_capture_errno(t, sock_errno);
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ESP_LOGE(TAG, "tcp_poll_write select error %d, errno = %s, fd = %d", sock_errno, strerror(sock_errno), tcp->sock);
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ret = -1;
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}
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return ret;
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}
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static int tcp_close(esp_transport_handle_t t)
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{
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transport_tcp_t *tcp = esp_transport_get_context_data(t);
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int ret = -1;
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if (tcp->sock >= 0) {
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ret = close(tcp->sock);
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tcp->sock = -1;
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}
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return ret;
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}
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static esp_err_t tcp_destroy(esp_transport_handle_t t)
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{
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transport_tcp_t *tcp = esp_transport_get_context_data(t);
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esp_transport_close(t);
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free(tcp);
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return 0;
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}
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static int tcp_get_socket(esp_transport_handle_t t)
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{
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if (t) {
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transport_tcp_t *tcp = t->data;
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if (tcp) {
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return tcp->sock;
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}
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}
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return -1;
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}
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void esp_transport_tcp_set_keep_alive(esp_transport_handle_t t, esp_transport_keep_alive_t *keep_alive_cfg)
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{
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if (t && keep_alive_cfg) {
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t->keep_alive_cfg = keep_alive_cfg;
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}
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}
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esp_transport_handle_t esp_transport_tcp_init(void)
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{
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esp_transport_handle_t t = esp_transport_init();
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transport_tcp_t *tcp = calloc(1, sizeof(transport_tcp_t));
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ESP_TRANSPORT_MEM_CHECK(TAG, tcp, {
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esp_transport_destroy(t);
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return NULL;
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});
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tcp->sock = -1;
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esp_transport_set_func(t, tcp_connect, tcp_read, tcp_write, tcp_close, tcp_poll_read, tcp_poll_write, tcp_destroy);
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esp_transport_set_context_data(t, tcp);
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t->_get_socket = tcp_get_socket;
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return t;
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}
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