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#include "network.h"
#include <util/generic/maybe.h>
#include <util/generic/ptr.h>
#include <util/network/init.h>
#include <util/network/socket.h>
#include <util/system/platform.h>
using namespace NBus;
using namespace NBus::NPrivate;
namespace {
TBindResult BindOnPortProto(int port, int af, bool reusePort) {
Y_VERIFY(af == AF_INET || af == AF_INET6, "wrong af");
SOCKET fd = ::socket(af, SOCK_STREAM, 0);
if (fd == INVALID_SOCKET) {
ythrow TSystemError() << "failed to create a socket";
}
int one = 1;
int r1 = SetSockOpt(fd, SOL_SOCKET, SO_REUSEADDR, one);
if (r1 < 0) {
ythrow TSystemError() << "failed to setsockopt SO_REUSEADDR";
}
#ifdef SO_REUSEPORT
if (reusePort) {
int r = SetSockOpt(fd, SOL_SOCKET, SO_REUSEPORT, one);
if (r < 0) {
ythrow TSystemError() << "failed to setsockopt SO_REUSEPORT";
}
}
#else
Y_UNUSED(reusePort);
#endif
THolder<TOpaqueAddr> addr(new TOpaqueAddr);
sockaddr* sa = addr->MutableAddr();
sa->sa_family = af;
socklen_t len;
if (af == AF_INET) {
len = sizeof(sockaddr_in);
((sockaddr_in*)sa)->sin_port = HostToInet((ui16)port);
((sockaddr_in*)sa)->sin_addr.s_addr = INADDR_ANY;
} else {
len = sizeof(sockaddr_in6);
((sockaddr_in6*)sa)->sin6_port = HostToInet((ui16)port);
}
if (af == AF_INET6) {
FixIPv6ListenSocket(fd);
}
int r2 = ::bind(fd, sa, len);
if (r2 < 0) {
ythrow TSystemError() << "failed to bind on port " << port;
}
int rsn = ::getsockname(fd, addr->MutableAddr(), addr->LenPtr());
if (rsn < 0) {
ythrow TSystemError() << "failed to getsockname";
}
int r3 = ::listen(fd, 50);
if (r3 < 0) {
ythrow TSystemError() << "listen failed";
}
TBindResult r;
r.Socket.Reset(new TSocketHolder(fd));
r.Addr = TNetAddr(addr.Release());
return r;
}
TMaybe<TBindResult> TryBindOnPortProto(int port, int af, bool reusePort) {
try {
return {BindOnPortProto(port, af, reusePort)};
} catch (const TSystemError&) {
return {};
}
}
std::pair<unsigned, TVector<TBindResult>> AggregateBindResults(TBindResult&& r1, TBindResult&& r2) {
Y_VERIFY(r1.Addr.GetPort() == r2.Addr.GetPort(), "internal");
std::pair<unsigned, TVector<TBindResult>> r;
r.second.reserve(2);
r.first = r1.Addr.GetPort();
r.second.emplace_back(std::move(r1));
r.second.emplace_back(std::move(r2));
return r;
}
}
std::pair<unsigned, TVector<TBindResult>> NBus::BindOnPort(int port, bool reusePort) {
std::pair<unsigned, TVector<TBindResult>> r;
r.second.reserve(2);
if (port != 0) {
return AggregateBindResults(BindOnPortProto(port, AF_INET, reusePort),
BindOnPortProto(port, AF_INET6, reusePort));
}
// use nothrow versions in cycle
for (int i = 0; i < 1000; ++i) {
TMaybe<TBindResult> in4 = TryBindOnPortProto(0, AF_INET, reusePort);
if (!in4) {
continue;
}
TMaybe<TBindResult> in6 = TryBindOnPortProto(in4->Addr.GetPort(), AF_INET6, reusePort);
if (!in6) {
continue;
}
return AggregateBindResults(std::move(*in4), std::move(*in6));
}
TBindResult in4 = BindOnPortProto(0, AF_INET, reusePort);
TBindResult in6 = BindOnPortProto(in4.Addr.GetPort(), AF_INET6, reusePort);
return AggregateBindResults(std::move(in4), std::move(in6));
}
void NBus::NPrivate::SetSockOptTcpCork(SOCKET s, bool value) {
#ifdef _linux_
CheckedSetSockOpt(s, IPPROTO_TCP, TCP_CORK, (int)value, "TCP_CORK");
#else
Y_UNUSED(s);
Y_UNUSED(value);
#endif
}
ssize_t NBus::NPrivate::SocketSend(SOCKET s, TArrayRef<const char> data) {
int flags = 0;
#if defined(_linux_) || defined(_freebsd_)
flags |= MSG_NOSIGNAL;
#endif
ssize_t r = ::send(s, data.data(), data.size(), flags);
if (r < 0) {
Y_VERIFY(LastSystemError() != EBADF, "bad fd");
}
return r;
}
ssize_t NBus::NPrivate::SocketRecv(SOCKET s, TArrayRef<char> buffer) {
int flags = 0;
#if defined(_linux_) || defined(_freebsd_)
flags |= MSG_NOSIGNAL;
#endif
ssize_t r = ::recv(s, buffer.data(), buffer.size(), flags);
if (r < 0) {
Y_VERIFY(LastSystemError() != EBADF, "bad fd");
}
return r;
}
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