mirror of
https://github.com/esphome/esphome.git
synced 2026-02-20 00:15:36 -07:00
646 lines
19 KiB
C++
646 lines
19 KiB
C++
#include "socket.h"
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#include "esphome/core/defines.h"
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#ifdef USE_SOCKET_IMPL_LWIP_TCP
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#include "lwip/ip.h"
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#include "lwip/netif.h"
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#include "lwip/opt.h"
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#include "lwip/tcp.h"
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#include <cerrno>
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#include <cstring>
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#include <array>
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#include "esphome/core/helpers.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace socket {
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static const char *const TAG = "socket.lwip";
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// set to 1 to enable verbose lwip logging
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#if 0
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#define LWIP_LOG(msg, ...) ESP_LOGVV(TAG, "socket %p: " msg, this, ##__VA_ARGS__)
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#else
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#define LWIP_LOG(msg, ...)
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#endif
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class LWIPRawImpl : public Socket {
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public:
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LWIPRawImpl(sa_family_t family, struct tcp_pcb *pcb) : pcb_(pcb), family_(family) {}
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~LWIPRawImpl() override {
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if (pcb_ != nullptr) {
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LWIP_LOG("tcp_abort(%p)", pcb_);
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tcp_abort(pcb_);
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pcb_ = nullptr;
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}
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}
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void init() {
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LWIP_LOG("init(%p)", pcb_);
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tcp_arg(pcb_, this);
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tcp_accept(pcb_, LWIPRawImpl::s_accept_fn);
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tcp_recv(pcb_, LWIPRawImpl::s_recv_fn);
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tcp_err(pcb_, LWIPRawImpl::s_err_fn);
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}
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std::unique_ptr<Socket> accept(struct sockaddr *addr, socklen_t *addrlen) override {
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if (pcb_ == nullptr) {
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errno = EBADF;
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return nullptr;
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}
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if (this->accepted_socket_count_ == 0) {
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errno = EWOULDBLOCK;
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return nullptr;
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}
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// Take from front for FIFO ordering
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std::unique_ptr<LWIPRawImpl> sock = std::move(this->accepted_sockets_[0]);
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// Shift remaining sockets forward
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for (uint8_t i = 1; i < this->accepted_socket_count_; i++) {
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this->accepted_sockets_[i - 1] = std::move(this->accepted_sockets_[i]);
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}
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this->accepted_socket_count_--;
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LWIP_LOG("Connection accepted by application, queue size: %d", this->accepted_socket_count_);
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if (addr != nullptr) {
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sock->getpeername(addr, addrlen);
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}
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LWIP_LOG("accept(%p)", sock.get());
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return std::unique_ptr<Socket>(std::move(sock));
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}
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int bind(const struct sockaddr *name, socklen_t addrlen) override {
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if (pcb_ == nullptr) {
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errno = EBADF;
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return -1;
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}
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if (name == nullptr) {
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errno = EINVAL;
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return 0;
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}
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ip_addr_t ip;
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in_port_t port;
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#if LWIP_IPV6
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if (family_ == AF_INET) {
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if (addrlen < sizeof(sockaddr_in)) {
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errno = EINVAL;
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return -1;
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}
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auto *addr4 = reinterpret_cast<const sockaddr_in *>(name);
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port = ntohs(addr4->sin_port);
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ip.type = IPADDR_TYPE_V4;
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ip.u_addr.ip4.addr = addr4->sin_addr.s_addr;
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LWIP_LOG("tcp_bind(%p ip=%s port=%u)", pcb_, ip4addr_ntoa(&ip.u_addr.ip4), port);
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} else if (family_ == AF_INET6) {
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if (addrlen < sizeof(sockaddr_in6)) {
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errno = EINVAL;
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return -1;
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}
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auto *addr6 = reinterpret_cast<const sockaddr_in6 *>(name);
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port = ntohs(addr6->sin6_port);
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ip.type = IPADDR_TYPE_ANY;
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memcpy(&ip.u_addr.ip6.addr, &addr6->sin6_addr.un.u8_addr, 16);
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LWIP_LOG("tcp_bind(%p ip=%s port=%u)", pcb_, ip6addr_ntoa(&ip.u_addr.ip6), port);
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} else {
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errno = EINVAL;
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return -1;
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}
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#else
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if (family_ != AF_INET) {
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errno = EINVAL;
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return -1;
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}
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auto *addr4 = reinterpret_cast<const sockaddr_in *>(name);
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port = ntohs(addr4->sin_port);
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ip.addr = addr4->sin_addr.s_addr;
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LWIP_LOG("tcp_bind(%p ip=%u port=%u)", pcb_, ip.addr, port);
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#endif
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err_t err = tcp_bind(pcb_, &ip, port);
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if (err == ERR_USE) {
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LWIP_LOG(" -> err ERR_USE");
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errno = EADDRINUSE;
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return -1;
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}
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if (err == ERR_VAL) {
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LWIP_LOG(" -> err ERR_VAL");
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errno = EINVAL;
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return -1;
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}
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if (err != ERR_OK) {
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LWIP_LOG(" -> err %d", err);
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errno = EIO;
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return -1;
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}
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return 0;
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}
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int close() override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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LWIP_LOG("tcp_close(%p)", pcb_);
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err_t err = tcp_close(pcb_);
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if (err != ERR_OK) {
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LWIP_LOG(" -> err %d", err);
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tcp_abort(pcb_);
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pcb_ = nullptr;
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errno = err == ERR_MEM ? ENOMEM : EIO;
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return -1;
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}
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pcb_ = nullptr;
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return 0;
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}
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int shutdown(int how) override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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bool shut_rx = false, shut_tx = false;
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if (how == SHUT_RD) {
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shut_rx = true;
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} else if (how == SHUT_WR) {
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shut_tx = true;
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} else if (how == SHUT_RDWR) {
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shut_rx = shut_tx = true;
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} else {
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errno = EINVAL;
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return -1;
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}
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LWIP_LOG("tcp_shutdown(%p shut_rx=%d shut_tx=%d)", pcb_, shut_rx ? 1 : 0, shut_tx ? 1 : 0);
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err_t err = tcp_shutdown(pcb_, shut_rx, shut_tx);
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if (err != ERR_OK) {
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LWIP_LOG(" -> err %d", err);
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errno = err == ERR_MEM ? ENOMEM : EIO;
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return -1;
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}
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return 0;
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}
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int getpeername(struct sockaddr *name, socklen_t *addrlen) override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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if (name == nullptr || addrlen == nullptr) {
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errno = EINVAL;
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return -1;
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}
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return this->ip2sockaddr_(&pcb_->local_ip, pcb_->local_port, name, addrlen);
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}
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std::string getpeername() override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return "";
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}
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char buffer[50] = {};
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if (IP_IS_V4_VAL(pcb_->remote_ip)) {
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inet_ntoa_r(pcb_->remote_ip, buffer, sizeof(buffer));
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}
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#if LWIP_IPV6
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else if (IP_IS_V6_VAL(pcb_->remote_ip)) {
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inet6_ntoa_r(pcb_->remote_ip, buffer, sizeof(buffer));
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}
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#endif
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return std::string(buffer);
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}
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int getsockname(struct sockaddr *name, socklen_t *addrlen) override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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if (name == nullptr || addrlen == nullptr) {
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errno = EINVAL;
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return -1;
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}
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return this->ip2sockaddr_(&pcb_->local_ip, pcb_->local_port, name, addrlen);
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}
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std::string getsockname() override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return "";
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}
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char buffer[50] = {};
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if (IP_IS_V4_VAL(pcb_->local_ip)) {
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inet_ntoa_r(pcb_->local_ip, buffer, sizeof(buffer));
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}
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#if LWIP_IPV6
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else if (IP_IS_V6_VAL(pcb_->local_ip)) {
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inet6_ntoa_r(pcb_->local_ip, buffer, sizeof(buffer));
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}
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#endif
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return std::string(buffer);
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}
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int getsockopt(int level, int optname, void *optval, socklen_t *optlen) override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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if (optlen == nullptr || optval == nullptr) {
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errno = EINVAL;
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return -1;
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}
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if (level == SOL_SOCKET && optname == SO_REUSEADDR) {
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if (*optlen < 4) {
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errno = EINVAL;
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return -1;
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}
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// lwip doesn't seem to have this feature. Don't send an error
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// to prevent warnings
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*reinterpret_cast<int *>(optval) = 1;
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*optlen = 4;
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return 0;
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}
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if (level == IPPROTO_TCP && optname == TCP_NODELAY) {
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if (*optlen < 4) {
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errno = EINVAL;
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return -1;
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}
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*reinterpret_cast<int *>(optval) = nodelay_;
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*optlen = 4;
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return 0;
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}
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errno = EINVAL;
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return -1;
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}
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int setsockopt(int level, int optname, const void *optval, socklen_t optlen) override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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if (level == SOL_SOCKET && optname == SO_REUSEADDR) {
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if (optlen != 4) {
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errno = EINVAL;
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return -1;
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}
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// lwip doesn't seem to have this feature. Don't send an error
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// to prevent warnings
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return 0;
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}
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if (level == IPPROTO_TCP && optname == TCP_NODELAY) {
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if (optlen != 4) {
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errno = EINVAL;
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return -1;
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}
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int val = *reinterpret_cast<const int *>(optval);
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nodelay_ = val;
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return 0;
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}
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errno = EINVAL;
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return -1;
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}
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int listen(int backlog) override {
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if (pcb_ == nullptr) {
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errno = EBADF;
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return -1;
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}
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LWIP_LOG("tcp_listen_with_backlog(%p backlog=%d)", pcb_, backlog);
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struct tcp_pcb *listen_pcb = tcp_listen_with_backlog(pcb_, backlog);
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if (listen_pcb == nullptr) {
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tcp_abort(pcb_);
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pcb_ = nullptr;
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errno = EOPNOTSUPP;
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return -1;
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}
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// tcp_listen reallocates the pcb, replace ours
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pcb_ = listen_pcb;
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// set callbacks on new pcb
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LWIP_LOG("tcp_arg(%p)", pcb_);
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tcp_arg(pcb_, this);
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tcp_accept(pcb_, LWIPRawImpl::s_accept_fn);
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return 0;
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}
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ssize_t read(void *buf, size_t len) override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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if (rx_closed_ && rx_buf_ == nullptr) {
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return 0;
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}
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if (len == 0) {
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return 0;
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}
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if (rx_buf_ == nullptr) {
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errno = EWOULDBLOCK;
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return -1;
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}
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size_t read = 0;
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uint8_t *buf8 = reinterpret_cast<uint8_t *>(buf);
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while (len && rx_buf_ != nullptr) {
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size_t pb_len = rx_buf_->len;
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size_t pb_left = pb_len - rx_buf_offset_;
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if (pb_left == 0)
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break;
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size_t copysize = std::min(len, pb_left);
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memcpy(buf8, reinterpret_cast<uint8_t *>(rx_buf_->payload) + rx_buf_offset_, copysize);
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if (pb_left == copysize) {
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// full pb copied, free it
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if (rx_buf_->next == nullptr) {
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// last buffer in chain
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pbuf_free(rx_buf_);
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rx_buf_ = nullptr;
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rx_buf_offset_ = 0;
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} else {
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auto *old_buf = rx_buf_;
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rx_buf_ = rx_buf_->next;
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pbuf_ref(rx_buf_);
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pbuf_free(old_buf);
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rx_buf_offset_ = 0;
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}
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} else {
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rx_buf_offset_ += copysize;
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}
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LWIP_LOG("tcp_recved(%p %u)", pcb_, copysize);
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tcp_recved(pcb_, copysize);
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buf8 += copysize;
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len -= copysize;
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read += copysize;
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}
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if (read == 0) {
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errno = EWOULDBLOCK;
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return -1;
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}
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return read;
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}
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ssize_t readv(const struct iovec *iov, int iovcnt) override {
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ssize_t ret = 0;
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for (int i = 0; i < iovcnt; i++) {
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ssize_t err = read(reinterpret_cast<uint8_t *>(iov[i].iov_base), iov[i].iov_len);
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if (err == -1) {
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if (ret != 0)
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// if we already read some don't return an error
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break;
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return err;
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}
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ret += err;
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if ((size_t) err != iov[i].iov_len)
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break;
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}
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return ret;
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}
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ssize_t internal_write(const void *buf, size_t len) {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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if (len == 0)
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return 0;
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if (buf == nullptr) {
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errno = EINVAL;
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return 0;
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}
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auto space = tcp_sndbuf(pcb_);
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if (space == 0) {
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errno = EWOULDBLOCK;
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return -1;
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}
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size_t to_send = std::min((size_t) space, len);
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LWIP_LOG("tcp_write(%p buf=%p %u)", pcb_, buf, to_send);
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err_t err = tcp_write(pcb_, buf, to_send, TCP_WRITE_FLAG_COPY);
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if (err == ERR_MEM) {
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LWIP_LOG(" -> err ERR_MEM");
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errno = EWOULDBLOCK;
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return -1;
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}
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if (err != ERR_OK) {
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LWIP_LOG(" -> err %d", err);
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errno = ECONNRESET;
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return -1;
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}
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return to_send;
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}
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int internal_output() {
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LWIP_LOG("tcp_output(%p)", pcb_);
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err_t err = tcp_output(pcb_);
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if (err == ERR_ABRT) {
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LWIP_LOG(" -> err ERR_ABRT");
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// sometimes lwip returns ERR_ABRT for no apparent reason
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// the connection works fine afterwards, and back with ESPAsyncTCP we
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// indirectly also ignored this error
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// FIXME: figure out where this is returned and what it means in this context
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return 0;
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}
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if (err != ERR_OK) {
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LWIP_LOG(" -> err %d", err);
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errno = ECONNRESET;
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return -1;
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}
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return 0;
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}
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ssize_t write(const void *buf, size_t len) override {
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ssize_t written = internal_write(buf, len);
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if (written == -1)
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return -1;
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if (written == 0)
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// no need to output if nothing written
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return 0;
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if (nodelay_) {
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int err = internal_output();
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if (err == -1)
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return -1;
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}
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return written;
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}
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ssize_t writev(const struct iovec *iov, int iovcnt) override {
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ssize_t written = 0;
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for (int i = 0; i < iovcnt; i++) {
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ssize_t err = internal_write(reinterpret_cast<uint8_t *>(iov[i].iov_base), iov[i].iov_len);
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if (err == -1) {
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if (written != 0)
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// if we already read some don't return an error
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break;
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return err;
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}
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written += err;
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if ((size_t) err != iov[i].iov_len)
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break;
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}
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if (written == 0)
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// no need to output if nothing written
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return 0;
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if (nodelay_) {
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int err = internal_output();
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if (err == -1)
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return -1;
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}
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return written;
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}
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ssize_t sendto(const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen) override {
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// return ::sendto(fd_, buf, len, flags, to, tolen);
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errno = ENOSYS;
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return -1;
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}
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int setblocking(bool blocking) override {
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if (pcb_ == nullptr) {
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errno = ECONNRESET;
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return -1;
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}
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if (blocking) {
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// blocking operation not supported
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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err_t accept_fn(struct tcp_pcb *newpcb, err_t err) {
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LWIP_LOG("accept(newpcb=%p err=%d)", newpcb, err);
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if (err != ERR_OK || newpcb == nullptr) {
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// "An error code if there has been an error accepting. Only return ERR_ABRT if you have
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// called tcp_abort from within the callback function!"
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// https://www.nongnu.org/lwip/2_1_x/tcp_8h.html#a00517abce6856d6c82f0efebdafb734d
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// nothing to do here, we just don't push it to the queue
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return ERR_OK;
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}
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// Check if we've reached the maximum accept queue size
|
||
if (this->accepted_socket_count_ >= MAX_ACCEPTED_SOCKETS) {
|
||
LWIP_LOG("Rejecting connection, queue full (%d)", this->accepted_socket_count_);
|
||
// Abort the connection when queue is full
|
||
tcp_abort(newpcb);
|
||
// Must return ERR_ABRT since we called tcp_abort()
|
||
return ERR_ABRT;
|
||
}
|
||
auto sock = make_unique<LWIPRawImpl>(family_, newpcb);
|
||
sock->init();
|
||
this->accepted_sockets_[this->accepted_socket_count_++] = std::move(sock);
|
||
LWIP_LOG("Accepted connection, queue size: %d", this->accepted_socket_count_);
|
||
return ERR_OK;
|
||
}
|
||
void err_fn(err_t err) {
|
||
LWIP_LOG("err(err=%d)", err);
|
||
// "If a connection is aborted because of an error, the application is alerted of this event by
|
||
// the err callback."
|
||
// pcb is already freed when this callback is called
|
||
// ERR_RST: connection was reset by remote host
|
||
// ERR_ABRT: aborted through tcp_abort or TCP timer
|
||
pcb_ = nullptr;
|
||
}
|
||
err_t recv_fn(struct pbuf *pb, err_t err) {
|
||
LWIP_LOG("recv(pb=%p err=%d)", pb, err);
|
||
if (err != 0) {
|
||
// "An error code if there has been an error receiving Only return ERR_ABRT if you have
|
||
// called tcp_abort from within the callback function!"
|
||
rx_closed_ = true;
|
||
return ERR_OK;
|
||
}
|
||
if (pb == nullptr) {
|
||
rx_closed_ = true;
|
||
return ERR_OK;
|
||
}
|
||
if (rx_buf_ == nullptr) {
|
||
// no need to copy because lwIP gave control of it to us
|
||
rx_buf_ = pb;
|
||
rx_buf_offset_ = 0;
|
||
} else {
|
||
pbuf_cat(rx_buf_, pb);
|
||
}
|
||
return ERR_OK;
|
||
}
|
||
|
||
static err_t s_accept_fn(void *arg, struct tcp_pcb *newpcb, err_t err) {
|
||
LWIPRawImpl *arg_this = reinterpret_cast<LWIPRawImpl *>(arg);
|
||
return arg_this->accept_fn(newpcb, err);
|
||
}
|
||
|
||
static void s_err_fn(void *arg, err_t err) {
|
||
LWIPRawImpl *arg_this = reinterpret_cast<LWIPRawImpl *>(arg);
|
||
arg_this->err_fn(err);
|
||
}
|
||
|
||
static err_t s_recv_fn(void *arg, struct tcp_pcb *pcb, struct pbuf *pb, err_t err) {
|
||
LWIPRawImpl *arg_this = reinterpret_cast<LWIPRawImpl *>(arg);
|
||
return arg_this->recv_fn(pb, err);
|
||
}
|
||
|
||
protected:
|
||
int ip2sockaddr_(ip_addr_t *ip, uint16_t port, struct sockaddr *name, socklen_t *addrlen) {
|
||
if (family_ == AF_INET) {
|
||
if (*addrlen < sizeof(struct sockaddr_in)) {
|
||
errno = EINVAL;
|
||
return -1;
|
||
}
|
||
|
||
struct sockaddr_in *addr = reinterpret_cast<struct sockaddr_in *>(name);
|
||
addr->sin_family = AF_INET;
|
||
*addrlen = addr->sin_len = sizeof(struct sockaddr_in);
|
||
addr->sin_port = port;
|
||
inet_addr_from_ip4addr(&addr->sin_addr, ip_2_ip4(ip));
|
||
return 0;
|
||
}
|
||
#if LWIP_IPV6
|
||
else if (family_ == AF_INET6) {
|
||
if (*addrlen < sizeof(struct sockaddr_in6)) {
|
||
errno = EINVAL;
|
||
return -1;
|
||
}
|
||
|
||
struct sockaddr_in6 *addr = reinterpret_cast<struct sockaddr_in6 *>(name);
|
||
addr->sin6_family = AF_INET6;
|
||
*addrlen = addr->sin6_len = sizeof(struct sockaddr_in6);
|
||
addr->sin6_port = port;
|
||
|
||
// AF_INET6 sockets are bound to IPv4 as well, so we may encounter IPv4 addresses that must be converted to IPv6.
|
||
if (IP_IS_V4(ip)) {
|
||
ip_addr_t mapped;
|
||
ip4_2_ipv4_mapped_ipv6(ip_2_ip6(&mapped), ip_2_ip4(ip));
|
||
inet6_addr_from_ip6addr(&addr->sin6_addr, ip_2_ip6(&mapped));
|
||
} else {
|
||
inet6_addr_from_ip6addr(&addr->sin6_addr, ip_2_ip6(ip));
|
||
}
|
||
return 0;
|
||
}
|
||
#endif
|
||
return -1;
|
||
}
|
||
|
||
struct tcp_pcb *pcb_;
|
||
// Accept queue - holds incoming connections briefly until the event loop calls accept()
|
||
// This is NOT a connection pool - just a temporary queue between LWIP callbacks and the main loop
|
||
// 3 slots is plenty since connections are pulled out quickly by the event loop
|
||
//
|
||
// Memory analysis: std::array<3> vs original std::queue implementation:
|
||
// - std::queue uses std::deque internally which on 32-bit systems needs:
|
||
// 24 bytes (deque object) + 32+ bytes (map array) + heap allocations
|
||
// Total: ~56+ bytes minimum, plus heap fragmentation
|
||
// - std::array<3>: 12 bytes fixed (3 pointers × 4 bytes)
|
||
// Saves ~44+ bytes RAM per listening socket + avoids ALL heap allocations
|
||
// Used on ESP8266 and RP2040 (platforms using LWIP_TCP implementation)
|
||
static constexpr size_t MAX_ACCEPTED_SOCKETS = 3;
|
||
std::array<std::unique_ptr<LWIPRawImpl>, MAX_ACCEPTED_SOCKETS> accepted_sockets_;
|
||
uint8_t accepted_socket_count_ = 0; // Number of sockets currently in queue
|
||
bool rx_closed_ = false;
|
||
pbuf *rx_buf_ = nullptr;
|
||
size_t rx_buf_offset_ = 0;
|
||
// don't use lwip nodelay flag, it sometimes causes reconnect
|
||
// instead use it for determining whether to call lwip_output
|
||
bool nodelay_ = false;
|
||
sa_family_t family_ = 0;
|
||
};
|
||
|
||
std::unique_ptr<Socket> socket(int domain, int type, int protocol) {
|
||
auto *pcb = tcp_new();
|
||
if (pcb == nullptr)
|
||
return nullptr;
|
||
auto *sock = new LWIPRawImpl((sa_family_t) domain, pcb); // NOLINT(cppcoreguidelines-owning-memory)
|
||
sock->init();
|
||
return std::unique_ptr<Socket>{sock};
|
||
}
|
||
|
||
std::unique_ptr<Socket> socket_loop_monitored(int domain, int type, int protocol) {
|
||
// LWIPRawImpl doesn't use file descriptors, so monitoring is not applicable
|
||
return socket(domain, type, protocol);
|
||
}
|
||
|
||
} // namespace socket
|
||
} // namespace esphome
|
||
|
||
#endif // USE_SOCKET_IMPL_LWIP_TCP
|