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net: split ConnectToSocket() from ConnectDirectly() for unix sockets

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This commit is contained in:
Matthew Zipkin 2023-07-12 16:10:05 -04:00
parent ac2ecf3182
commit d9318a37ec
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GPG key ID: E7E2984B6289C93A
2 changed files with 99 additions and 51 deletions
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148
src/netbase.cpp
View file

@ -535,6 +535,61 @@ static void LogConnectFailure(bool manual_connection, const char* fmt, const Arg
}
}
static bool ConnectToSocket(const Sock& sock, struct sockaddr* sockaddr, socklen_t len, const std::string& dest_str, bool manual_connection)
{
// Connect to `sockaddr` using `sock`.
if (sock.Connect(sockaddr, len) == SOCKET_ERROR) {
int nErr = WSAGetLastError();
// WSAEINVAL is here because some legacy version of winsock uses it
if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
{
// Connection didn't actually fail, but is being established
// asynchronously. Thus, use async I/O api (select/poll)
// synchronously to check for successful connection with a timeout.
const Sock::Event requested = Sock::RECV | Sock::SEND;
Sock::Event occurred;
if (!sock.Wait(std::chrono::milliseconds{nConnectTimeout}, requested, &occurred)) {
LogPrintf("wait for connect to %s failed: %s\n",
dest_str,
NetworkErrorString(WSAGetLastError()));
return false;
} else if (occurred == 0) {
LogPrint(BCLog::NET, "connection attempt to %s timed out\n", dest_str);
return false;
}
// Even if the wait was successful, the connect might not
// have been successful. The reason for this failure is hidden away
// in the SO_ERROR for the socket in modern systems. We read it into
// sockerr here.
int sockerr;
socklen_t sockerr_len = sizeof(sockerr);
if (sock.GetSockOpt(SOL_SOCKET, SO_ERROR, (sockopt_arg_type)&sockerr, &sockerr_len) ==
SOCKET_ERROR) {
LogPrintf("getsockopt() for %s failed: %s\n", dest_str, NetworkErrorString(WSAGetLastError()));
return false;
}
if (sockerr != 0) {
LogConnectFailure(manual_connection,
"connect() to %s failed after wait: %s",
dest_str,
NetworkErrorString(sockerr));
return false;
}
}
#ifdef WIN32
else if (WSAGetLastError() != WSAEISCONN)
#else
else
#endif
{
LogConnectFailure(manual_connection, "connect() to %s failed: %s", dest_str, NetworkErrorString(WSAGetLastError()));
return false;
}
}
return true;
}
std::unique_ptr<Sock> ConnectDirectly(const CService& dest, bool manual_connection)
{
auto sock = CreateSock(dest.GetSAFamily());
@ -547,63 +602,54 @@ std::unique_ptr<Sock> ConnectDirectly(const CService& dest, bool manual_connecti
struct sockaddr_storage sockaddr;
socklen_t len = sizeof(sockaddr);
if (!dest.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
LogPrintf("Cannot connect to %s: unsupported network\n", dest.ToStringAddrPort());
LogPrintf("Cannot get sockaddr for %s: unsupported network\n", dest.ToStringAddrPort());
return {};
}
// Connect to the dest service on the hSocket socket.
if (sock->Connect(reinterpret_cast<struct sockaddr*>(&sockaddr), len) == SOCKET_ERROR) {
int nErr = WSAGetLastError();
// WSAEINVAL is here because some legacy version of winsock uses it
if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
{
// Connection didn't actually fail, but is being established
// asynchronously. Thus, use async I/O api (select/poll)
// synchronously to check for successful connection with a timeout.
const Sock::Event requested = Sock::RECV | Sock::SEND;
Sock::Event occurred;
if (!sock->Wait(std::chrono::milliseconds{nConnectTimeout}, requested, &occurred)) {
LogPrintf("wait for connect to %s failed: %s\n",
dest.ToStringAddrPort(),
NetworkErrorString(WSAGetLastError()));
return {};
} else if (occurred == 0) {
LogPrint(BCLog::NET, "connection attempt to %s timed out\n", dest.ToStringAddrPort());
return {};
}
// Even if the wait was successful, the connect might not
// have been successful. The reason for this failure is hidden away
// in the SO_ERROR for the socket in modern systems. We read it into
// sockerr here.
int sockerr;
socklen_t sockerr_len = sizeof(sockerr);
if (sock->GetSockOpt(SOL_SOCKET, SO_ERROR, (sockopt_arg_type)&sockerr, &sockerr_len) ==
SOCKET_ERROR) {
LogPrintf("getsockopt() for %s failed: %s\n", dest.ToStringAddrPort(), NetworkErrorString(WSAGetLastError()));
return {};
}
if (sockerr != 0) {
LogConnectFailure(manual_connection,
"connect() to %s failed after wait: %s",
dest.ToStringAddrPort(),
NetworkErrorString(sockerr));
return {};
}
}
#ifdef WIN32
else if (WSAGetLastError() != WSAEISCONN)
#else
else
#endif
{
LogConnectFailure(manual_connection, "connect() to %s failed: %s", dest.ToStringAddrPort(), NetworkErrorString(WSAGetLastError()));
return {};
}
if (!ConnectToSocket(*sock, (struct sockaddr*)&sockaddr, len, dest.ToStringAddrPort(), manual_connection)) {
LogPrintf("Cannot connect to socket for %s\n", dest.ToStringAddrPort());
return {};
}
return sock;
}
std::unique_ptr<Sock> Proxy::Connect() const
{
if (!IsValid()) {
LogPrintf("Cannot connect to invalid Proxy\n");
return {};
}
if (!m_is_unix_socket) return ConnectDirectly(proxy, /*manual_connection=*/true);
#if HAVE_SOCKADDR_UN
auto sock = CreateSock(AF_UNIX);
if (!sock) {
LogPrintLevel(BCLog::NET, BCLog::Level::Error, "Cannot create a socket for connecting to %s\n", m_unix_socket_path);
return {};
}
const std::string path{m_unix_socket_path.substr(ADDR_PREFIX_UNIX.length())};
struct sockaddr_un addrun;
memset(&addrun, 0, sizeof(addrun));
addrun.sun_family = AF_UNIX;
// leave the last char in addrun.sun_path[] to be always '\0'
memcpy(addrun.sun_path, path.c_str(), std::min(sizeof(addrun.sun_path) - 1, path.length()));
socklen_t len = sizeof(addrun);
if(!ConnectToSocket(*sock, (struct sockaddr*)&addrun, len, path, /*manual_connection=*/true)) {
LogPrintf("Cannot connect to socket for %s\n", path);
return {};
}
return sock;
#else
return {};
#endif
}
bool SetProxy(enum Network net, const Proxy &addrProxy) {
assert(net >= 0 && net < NET_MAX);
if (!addrProxy.IsValid())
@ -658,7 +704,7 @@ std::unique_ptr<Sock> ConnectThroughProxy(const Proxy& proxy,
bool& proxy_connection_failed)
{
// first connect to proxy server
auto sock = ConnectDirectly(proxy.proxy, /*manual_connection=*/true);
auto sock = proxy.Connect();
if (!sock) {
proxy_connection_failed = true;
return {};

2
src/netbase.h
View file

@ -84,6 +84,8 @@ public:
if (m_is_unix_socket) return m_unix_socket_path;
return proxy.ToStringAddrPort();
}
std::unique_ptr<Sock> Connect() const;
};
/** Credentials for proxy authentication */