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module;
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include <cerrno>
#endif
export module mcpplibs.tinyhttps:socket;
import std;
import :platform;
namespace mcpplibs::tinyhttps {
#ifdef _WIN32
using SocketHandle = SOCKET;
constexpr SocketHandle INVALID_SOCKET_FD = INVALID_SOCKET;
#else
using SocketHandle = int;
constexpr SocketHandle INVALID_SOCKET_FD = -1;
#endif
export class Socket {
public:
Socket() = default;
~Socket() {
close();
}
// Non-copyable
Socket(const Socket&) = delete;
Socket& operator=(const Socket&) = delete;
// Move constructor
Socket(Socket&& other) noexcept
: fd_(other.fd_) {
other.fd_ = INVALID_SOCKET_FD;
}
// Move assignment
Socket& operator=(Socket&& other) noexcept {
if (this != &other) {
close();
fd_ = other.fd_;
other.fd_ = INVALID_SOCKET_FD;
}
return *this;
}
[[nodiscard]] bool is_valid() const {
return fd_ != INVALID_SOCKET_FD;
}
bool connect(const char* host, int port, int timeoutMs) {
// Close existing connection if any
if (is_valid()) {
close();
}
auto portStr = std::to_string(port);
// Resolve via the system resolver (getaddrinfo). On Termux/Android a
// musl-static build can't — its nameservers live in $PREFIX/etc/resolv.conf
// which libc never reads — so fall back to a manual DNS query there.
auto try_resolved = [&](const char* node, bool numeric) -> bool {
struct addrinfo hints{};
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (numeric) hints.ai_flags = AI_NUMERICHOST;
struct addrinfo* result = nullptr;
if (::getaddrinfo(node, portStr.c_str(), &hints, &result) != 0 || result == nullptr) {
return false;
}
bool ok = connect_addrinfo(result, timeoutMs);
::freeaddrinfo(result);
return ok;
};
if constexpr (platform::is_windows) {
return try_resolved(host, /*numeric=*/false);
} else {
// Fall back to a manual DNS query when libc can't resolve (Termux:
// nameservers live in $PREFIX/etc/resolv.conf, which libc ignores).
auto try_manual = [&]() -> bool {
// DNS must be snappy: a UDP query to a working resolver answers
// in well under a second. Cap it hard (independent of the much
// larger connect timeout) so an intermittently-dropped packet to
// 8.8.8.8 can't stall a connect for tens of seconds per host.
// Plain ternary, not std::min: <winsock2.h> defines a `min`
// macro that would mangle std::min on the (compiled-but-discarded)
// Windows branch of this if constexpr.
constexpr int kDnsTimeoutMs = 2500;
int dnsTimeout = (timeoutMs > 0 && timeoutMs < kDnsTimeoutMs)
? timeoutMs : kDnsTimeoutMs;
for (const auto& ip : platform::resolve_fallback(host, dnsTimeout)) {
if (try_resolved(ip.c_str(), /*numeric=*/true)) return true;
}
return false;
};
// No libc resolver config but a relocatable one exists → resolve
// manually first to avoid a multi-second stall on a dead 127.0.0.1:53.
if (!platform::system_resolver_configured()) {
return try_manual() || try_resolved(host, /*numeric=*/false);
}
return try_resolved(host, /*numeric=*/false) || try_manual();
}
}
// Connect to the first reachable address in a resolved list.
bool connect_addrinfo(struct addrinfo* result, int timeoutMs) {
for (auto* rp = result; rp != nullptr; rp = rp->ai_next) {
SocketHandle fd = ::socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (fd == INVALID_SOCKET_FD) {
continue;
}
// Set non-blocking
if (!set_non_blocking(fd, true)) {
close_handle(fd);
continue;
}
int rc = ::connect(fd, rp->ai_addr, static_cast<int>(rp->ai_addrlen));
bool connected = false;
if (rc == 0) {
connected = true;
} else {
#ifdef _WIN32
if (WSAGetLastError() == WSAEWOULDBLOCK) {
#else
if (errno == EINPROGRESS) {
#endif
// Wait for connection with timeout
if (poll_fd(fd, timeoutMs, false)) {
int err = 0;
socklen_t len = sizeof(err);
if (::getsockopt(fd, SOL_SOCKET, SO_ERROR, reinterpret_cast<char*>(&err), &len) == 0 && err == 0) {
connected = true;
}
}
}
}
if (connected) {
// Restore blocking mode
set_non_blocking(fd, false);
fd_ = fd;
return true;
}
close_handle(fd);
}
return false;
}
int read(char* buf, int len) {
if (!is_valid()) return -1;
return static_cast<int>(::recv(fd_, buf, len, 0));
}
int write(const char* buf, int len) {
if (!is_valid()) return -1;
return static_cast<int>(::send(fd_, buf, len, 0));
}
bool wait_readable(int timeoutMs) {
if (!is_valid()) return false;
return poll_fd(fd_, timeoutMs, true);
}
bool wait_writable(int timeoutMs) {
if (!is_valid()) return false;
return poll_fd(fd_, timeoutMs, false);
}
[[nodiscard]] SocketHandle native_handle() const {
return fd_;
}
void close() {
if (is_valid()) {
close_handle(fd_);
fd_ = INVALID_SOCKET_FD;
}
}
static void platform_init() {
#ifdef _WIN32
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
#endif
}
static void platform_cleanup() {
#ifdef _WIN32
WSACleanup();
#endif
}
private:
SocketHandle fd_ = INVALID_SOCKET_FD;
static bool set_non_blocking(SocketHandle fd, bool nonBlocking) {
#ifdef _WIN32
u_long mode = nonBlocking ? 1 : 0;
return ioctlsocket(fd, FIONBIO, &mode) == 0;
#else
int flags = ::fcntl(fd, F_GETFL, 0);
if (flags == -1) return false;
if (nonBlocking) {
flags |= O_NONBLOCK;
} else {
flags &= ~O_NONBLOCK;
}
return ::fcntl(fd, F_SETFL, flags) == 0;
#endif
}
static bool poll_fd(SocketHandle fd, int timeoutMs, bool forRead) {
#ifdef _WIN32
WSAPOLLFD pfd{};
pfd.fd = fd;
pfd.events = forRead ? POLLIN : POLLOUT;
int ret = WSAPoll(&pfd, 1, timeoutMs);
return ret > 0 && (pfd.revents & (pfd.events | POLLERR | POLLHUP));
#else
struct pollfd pfd{};
pfd.fd = fd;
pfd.events = forRead ? POLLIN : POLLOUT;
int ret = ::poll(&pfd, 1, timeoutMs);
return ret > 0 && (pfd.revents & (pfd.events | POLLERR | POLLHUP));
#endif
}
static void close_handle(SocketHandle fd) {
#ifdef _WIN32
::closesocket(fd);
#else
::close(fd);
#endif
}
};
} // namespace mcpplibs::tinyhttps
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