diff options
Diffstat (limited to 'src/netbase.cpp')
| -rw-r--r-- | src/netbase.cpp | 494 |
1 files changed, 145 insertions, 349 deletions
diff --git a/src/netbase.cpp b/src/netbase.cpp index 264029d8a2..2980bdf459 100644 --- a/src/netbase.cpp +++ b/src/netbase.cpp @@ -5,15 +5,21 @@ #include <netbase.h> +#include <compat.h> #include <sync.h> #include <tinyformat.h> +#include <util/sock.h> #include <util/strencodings.h> #include <util/string.h> #include <util/system.h> +#include <util/time.h> #include <atomic> +#include <chrono> #include <cstdint> +#include <functional> #include <limits> +#include <memory> #ifndef WIN32 #include <fcntl.h> @@ -25,10 +31,6 @@ #include <poll.h> #endif -#if !defined(MSG_NOSIGNAL) -#define MSG_NOSIGNAL 0 -#endif - // Settings static Mutex g_proxyinfo_mutex; static proxyType proxyInfo[NET_MAX] GUARDED_BY(g_proxyinfo_mutex); @@ -37,9 +39,53 @@ int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT; bool fNameLookup = DEFAULT_NAME_LOOKUP; // Need ample time for negotiation for very slow proxies such as Tor (milliseconds) -static const int SOCKS5_RECV_TIMEOUT = 20 * 1000; +int g_socks5_recv_timeout = 20 * 1000; static std::atomic<bool> interruptSocks5Recv(false); +std::vector<CNetAddr> WrappedGetAddrInfo(const std::string& name, bool allow_lookup) +{ + addrinfo ai_hint{}; + // We want a TCP port, which is a streaming socket type + ai_hint.ai_socktype = SOCK_STREAM; + ai_hint.ai_protocol = IPPROTO_TCP; + // We don't care which address family (IPv4 or IPv6) is returned + ai_hint.ai_family = AF_UNSPEC; + // If we allow lookups of hostnames, use the AI_ADDRCONFIG flag to only + // return addresses whose family we have an address configured for. + // + // If we don't allow lookups, then use the AI_NUMERICHOST flag for + // getaddrinfo to only decode numerical network addresses and suppress + // hostname lookups. + ai_hint.ai_flags = allow_lookup ? AI_ADDRCONFIG : AI_NUMERICHOST; + + addrinfo* ai_res{nullptr}; + const int n_err{getaddrinfo(name.c_str(), nullptr, &ai_hint, &ai_res)}; + if (n_err != 0) { + return {}; + } + + // Traverse the linked list starting with ai_trav. + addrinfo* ai_trav{ai_res}; + std::vector<CNetAddr> resolved_addresses; + while (ai_trav != nullptr) { + if (ai_trav->ai_family == AF_INET) { + assert(ai_trav->ai_addrlen >= sizeof(sockaddr_in)); + resolved_addresses.emplace_back(reinterpret_cast<sockaddr_in*>(ai_trav->ai_addr)->sin_addr); + } + if (ai_trav->ai_family == AF_INET6) { + assert(ai_trav->ai_addrlen >= sizeof(sockaddr_in6)); + const sockaddr_in6* s6{reinterpret_cast<sockaddr_in6*>(ai_trav->ai_addr)}; + resolved_addresses.emplace_back(s6->sin6_addr, s6->sin6_scope_id); + } + ai_trav = ai_trav->ai_next; + } + freeaddrinfo(ai_res); + + return resolved_addresses; +} + +DNSLookupFn g_dns_lookup{WrappedGetAddrInfo}; + enum Network ParseNetwork(const std::string& net_in) { std::string net = ToLower(net_in); if (net == "ipv4") return NET_IPV4; @@ -49,13 +95,16 @@ enum Network ParseNetwork(const std::string& net_in) { LogPrintf("Warning: net name 'tor' is deprecated and will be removed in the future. You should use 'onion' instead.\n"); return NET_ONION; } + if (net == "i2p") { + return NET_I2P; + } return NET_UNROUTABLE; } std::string GetNetworkName(enum Network net) { switch (net) { - case NET_UNROUTABLE: return "unroutable"; + case NET_UNROUTABLE: return "not_publicly_routable"; case NET_IPV4: return "ipv4"; case NET_IPV6: return "ipv6"; case NET_ONION: return "onion"; @@ -68,7 +117,21 @@ std::string GetNetworkName(enum Network net) assert(false); } -bool static LookupIntern(const std::string& name, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup) +std::vector<std::string> GetNetworkNames(bool append_unroutable) +{ + std::vector<std::string> names; + for (int n = 0; n < NET_MAX; ++n) { + const enum Network network{static_cast<Network>(n)}; + if (network == NET_UNROUTABLE || network == NET_CJDNS || network == NET_INTERNAL) continue; + names.emplace_back(GetNetworkName(network)); + } + if (append_unroutable) { + names.emplace_back(GetNetworkName(NET_UNROUTABLE)); + } + return names; +} + +static bool LookupIntern(const std::string& name, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup, DNSLookupFn dns_lookup_function) { vIP.clear(); @@ -90,73 +153,20 @@ bool static LookupIntern(const std::string& name, std::vector<CNetAddr>& vIP, un } } - struct addrinfo aiHint; - memset(&aiHint, 0, sizeof(struct addrinfo)); - - // We want a TCP port, which is a streaming socket type - aiHint.ai_socktype = SOCK_STREAM; - aiHint.ai_protocol = IPPROTO_TCP; - // We don't care which address family (IPv4 or IPv6) is returned - aiHint.ai_family = AF_UNSPEC; - // If we allow lookups of hostnames, use the AI_ADDRCONFIG flag to only - // return addresses whose family we have an address configured for. - // - // If we don't allow lookups, then use the AI_NUMERICHOST flag for - // getaddrinfo to only decode numerical network addresses and suppress - // hostname lookups. - aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST; - struct addrinfo *aiRes = nullptr; - int nErr = getaddrinfo(name.c_str(), nullptr, &aiHint, &aiRes); - if (nErr) - return false; - - // Traverse the linked list starting with aiTrav, add all non-internal - // IPv4,v6 addresses to vIP while respecting nMaxSolutions. - struct addrinfo *aiTrav = aiRes; - while (aiTrav != nullptr && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions)) - { - CNetAddr resolved; - if (aiTrav->ai_family == AF_INET) - { - assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in)); - resolved = CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr); - } - - if (aiTrav->ai_family == AF_INET6) - { - assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6)); - struct sockaddr_in6* s6 = (struct sockaddr_in6*) aiTrav->ai_addr; - resolved = CNetAddr(s6->sin6_addr, s6->sin6_scope_id); + for (const CNetAddr& resolved : dns_lookup_function(name, fAllowLookup)) { + if (nMaxSolutions > 0 && vIP.size() >= nMaxSolutions) { + break; } /* Never allow resolving to an internal address. Consider any such result invalid */ if (!resolved.IsInternal()) { vIP.push_back(resolved); } - - aiTrav = aiTrav->ai_next; } - freeaddrinfo(aiRes); - return (vIP.size() > 0); } -/** - * Resolve a host string to its corresponding network addresses. - * - * @param name The string representing a host. Could be a name or a numerical - * IP address (IPv6 addresses in their bracketed form are - * allowed). - * @param[out] vIP The resulting network addresses to which the specified host - * string resolved. - * - * @returns Whether or not the specified host string successfully resolved to - * any resulting network addresses. - * - * @see Lookup(const char *, std::vector<CService>&, int, bool, unsigned int) - * for additional parameter descriptions. - */ -bool LookupHost(const std::string& name, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup) +bool LookupHost(const std::string& name, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup, DNSLookupFn dns_lookup_function) { if (!ValidAsCString(name)) { return false; @@ -168,59 +178,33 @@ bool LookupHost(const std::string& name, std::vector<CNetAddr>& vIP, unsigned in strHost = strHost.substr(1, strHost.size() - 2); } - return LookupIntern(strHost, vIP, nMaxSolutions, fAllowLookup); + return LookupIntern(strHost, vIP, nMaxSolutions, fAllowLookup, dns_lookup_function); } - /** - * Resolve a host string to its first corresponding network address. - * - * @see LookupHost(const std::string&, std::vector<CNetAddr>&, unsigned int, bool) for - * additional parameter descriptions. - */ -bool LookupHost(const std::string& name, CNetAddr& addr, bool fAllowLookup) +bool LookupHost(const std::string& name, CNetAddr& addr, bool fAllowLookup, DNSLookupFn dns_lookup_function) { if (!ValidAsCString(name)) { return false; } std::vector<CNetAddr> vIP; - LookupHost(name, vIP, 1, fAllowLookup); + LookupHost(name, vIP, 1, fAllowLookup, dns_lookup_function); if(vIP.empty()) return false; addr = vIP.front(); return true; } -/** - * Resolve a service string to its corresponding service. - * - * @param name The string representing a service. Could be a name or a - * numerical IP address (IPv6 addresses should be in their - * disambiguated bracketed form), optionally followed by a port - * number. (e.g. example.com:8333 or - * [2001:db8:85a3:8d3:1319:8a2e:370:7348]:420) - * @param[out] vAddr The resulting services to which the specified service string - * resolved. - * @param portDefault The default port for resulting services if not specified - * by the service string. - * @param fAllowLookup Whether or not hostname lookups are permitted. If yes, - * external queries may be performed. - * @param nMaxSolutions The maximum number of results we want, specifying 0 - * means "as many solutions as we get." - * - * @returns Whether or not the service string successfully resolved to any - * resulting services. - */ -bool Lookup(const std::string& name, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions) +bool Lookup(const std::string& name, std::vector<CService>& vAddr, uint16_t portDefault, bool fAllowLookup, unsigned int nMaxSolutions, DNSLookupFn dns_lookup_function) { if (name.empty() || !ValidAsCString(name)) { return false; } - int port = portDefault; + uint16_t port{portDefault}; std::string hostname; SplitHostPort(name, port, hostname); std::vector<CNetAddr> vIP; - bool fRet = LookupIntern(hostname, vIP, nMaxSolutions, fAllowLookup); + bool fRet = LookupIntern(hostname, vIP, nMaxSolutions, fAllowLookup, dns_lookup_function); if (!fRet) return false; vAddr.resize(vIP.size()); @@ -229,36 +213,20 @@ bool Lookup(const std::string& name, std::vector<CService>& vAddr, int portDefau return true; } -/** - * Resolve a service string to its first corresponding service. - * - * @see Lookup(const char *, std::vector<CService>&, int, bool, unsigned int) - * for additional parameter descriptions. - */ -bool Lookup(const std::string& name, CService& addr, int portDefault, bool fAllowLookup) +bool Lookup(const std::string& name, CService& addr, uint16_t portDefault, bool fAllowLookup, DNSLookupFn dns_lookup_function) { if (!ValidAsCString(name)) { return false; } std::vector<CService> vService; - bool fRet = Lookup(name, vService, portDefault, fAllowLookup, 1); + bool fRet = Lookup(name, vService, portDefault, fAllowLookup, 1, dns_lookup_function); if (!fRet) return false; addr = vService[0]; return true; } -/** - * Resolve a service string with a numeric IP to its first corresponding - * service. - * - * @returns The resulting CService if the resolution was successful, [::]:0 - * otherwise. - * - * @see Lookup(const char *, CService&, int, bool) for additional parameter - * descriptions. - */ -CService LookupNumeric(const std::string& name, int portDefault) +CService LookupNumeric(const std::string& name, uint16_t portDefault, DNSLookupFn dns_lookup_function) { if (!ValidAsCString(name)) { return {}; @@ -266,19 +234,11 @@ CService LookupNumeric(const std::string& name, int portDefault) CService addr; // "1.2:345" will fail to resolve the ip, but will still set the port. // If the ip fails to resolve, re-init the result. - if(!Lookup(name, addr, portDefault, false)) + if(!Lookup(name, addr, portDefault, false, dns_lookup_function)) addr = CService(); return addr; } -struct timeval MillisToTimeval(int64_t nTimeout) -{ - struct timeval timeout; - timeout.tv_sec = nTimeout / 1000; - timeout.tv_usec = (nTimeout % 1000) * 1000; - return timeout; -} - /** SOCKS version */ enum SOCKSVersion: uint8_t { SOCKS4 = 0x04, @@ -336,8 +296,7 @@ enum class IntrRecvError { * @param data The buffer where the read bytes should be stored. * @param len The number of bytes to read into the specified buffer. * @param timeout The total timeout in milliseconds for this read. - * @param hSocket The socket (has to be in non-blocking mode) from which to read - * bytes. + * @param sock The socket (has to be in non-blocking mode) from which to read bytes. * * @returns An IntrRecvError indicating the resulting status of this read. * IntrRecvError::OK only if all of the specified number of bytes were @@ -347,15 +306,12 @@ enum class IntrRecvError { * Sockets can be made non-blocking with SetSocketNonBlocking(const * SOCKET&, bool). */ -static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, const SOCKET& hSocket) +static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, const Sock& sock) { int64_t curTime = GetTimeMillis(); int64_t endTime = curTime + timeout; - // Maximum time to wait for I/O readiness. It will take up until this time - // (in millis) to break off in case of an interruption. - const int64_t maxWait = 1000; while (len > 0 && curTime < endTime) { - ssize_t ret = recv(hSocket, (char*)data, len, 0); // Optimistically try the recv first + ssize_t ret = sock.Recv(data, len, 0); // Optimistically try the recv first if (ret > 0) { len -= ret; data += ret; @@ -364,25 +320,11 @@ static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, c } else { // Other error or blocking int nErr = WSAGetLastError(); if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) { - if (!IsSelectableSocket(hSocket)) { - return IntrRecvError::NetworkError; - } - // Only wait at most maxWait milliseconds at a time, unless + // Only wait at most MAX_WAIT_FOR_IO at a time, unless // we're approaching the end of the specified total timeout - int timeout_ms = std::min(endTime - curTime, maxWait); -#ifdef USE_POLL - struct pollfd pollfd = {}; - pollfd.fd = hSocket; - pollfd.events = POLLIN; - int nRet = poll(&pollfd, 1, timeout_ms); -#else - struct timeval tval = MillisToTimeval(timeout_ms); - fd_set fdset; - FD_ZERO(&fdset); - FD_SET(hSocket, &fdset); - int nRet = select(hSocket + 1, &fdset, nullptr, nullptr, &tval); -#endif - if (nRet == SOCKET_ERROR) { + const auto remaining = std::chrono::milliseconds{endTime - curTime}; + const auto timeout = std::min(remaining, std::chrono::milliseconds{MAX_WAIT_FOR_IO}); + if (!sock.Wait(timeout, Sock::RECV)) { return IntrRecvError::NetworkError; } } else { @@ -396,13 +338,6 @@ static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, c return len == 0 ? IntrRecvError::OK : IntrRecvError::Timeout; } -/** Credentials for proxy authentication */ -struct ProxyCredentials -{ - std::string username; - std::string password; -}; - /** Convert SOCKS5 reply to an error message */ static std::string Socks5ErrorString(uint8_t err) { @@ -428,25 +363,7 @@ static std::string Socks5ErrorString(uint8_t err) } } -/** - * Connect to a specified destination service through an already connected - * SOCKS5 proxy. - * - * @param strDest The destination fully-qualified domain name. - * @param port The destination port. - * @param auth The credentials with which to authenticate with the specified - * SOCKS5 proxy. - * @param hSocket The SOCKS5 proxy socket. - * - * @returns Whether or not the operation succeeded. - * - * @note The specified SOCKS5 proxy socket must already be connected to the - * SOCKS5 proxy. - * - * @see <a href="https://www.ietf.org/rfc/rfc1928.txt">RFC1928: SOCKS Protocol - * Version 5</a> - */ -static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, const SOCKET& hSocket) +bool Socks5(const std::string& strDest, uint16_t port, const ProxyCredentials* auth, const Sock& sock) { IntrRecvError recvr; LogPrint(BCLog::NET, "SOCKS5 connecting %s\n", strDest); @@ -464,12 +381,12 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials vSocks5Init.push_back(0x01); // 1 method identifier follows... vSocks5Init.push_back(SOCKS5Method::NOAUTH); } - ssize_t ret = send(hSocket, (const char*)vSocks5Init.data(), vSocks5Init.size(), MSG_NOSIGNAL); + ssize_t ret = sock.Send(vSocks5Init.data(), vSocks5Init.size(), MSG_NOSIGNAL); if (ret != (ssize_t)vSocks5Init.size()) { return error("Error sending to proxy"); } uint8_t pchRet1[2]; - if ((recvr = InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { + if ((recvr = InterruptibleRecv(pchRet1, 2, g_socks5_recv_timeout, sock)) != IntrRecvError::OK) { LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port); return false; } @@ -486,13 +403,13 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end()); vAuth.push_back(auth->password.size()); vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end()); - ret = send(hSocket, (const char*)vAuth.data(), vAuth.size(), MSG_NOSIGNAL); + ret = sock.Send(vAuth.data(), vAuth.size(), MSG_NOSIGNAL); if (ret != (ssize_t)vAuth.size()) { return error("Error sending authentication to proxy"); } LogPrint(BCLog::PROXY, "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password); uint8_t pchRetA[2]; - if ((recvr = InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { + if ((recvr = InterruptibleRecv(pchRetA, 2, g_socks5_recv_timeout, sock)) != IntrRecvError::OK) { return error("Error reading proxy authentication response"); } if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) { @@ -512,12 +429,12 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end()); vSocks5.push_back((port >> 8) & 0xFF); vSocks5.push_back((port >> 0) & 0xFF); - ret = send(hSocket, (const char*)vSocks5.data(), vSocks5.size(), MSG_NOSIGNAL); + ret = sock.Send(vSocks5.data(), vSocks5.size(), MSG_NOSIGNAL); if (ret != (ssize_t)vSocks5.size()) { return error("Error sending to proxy"); } uint8_t pchRet2[4]; - if ((recvr = InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { + if ((recvr = InterruptibleRecv(pchRet2, 4, g_socks5_recv_timeout, sock)) != IntrRecvError::OK) { if (recvr == IntrRecvError::Timeout) { /* If a timeout happens here, this effectively means we timed out while connecting * to the remote node. This is very common for Tor, so do not print an @@ -541,16 +458,16 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials uint8_t pchRet3[256]; switch (pchRet2[3]) { - case SOCKS5Atyp::IPV4: recvr = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break; - case SOCKS5Atyp::IPV6: recvr = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break; + case SOCKS5Atyp::IPV4: recvr = InterruptibleRecv(pchRet3, 4, g_socks5_recv_timeout, sock); break; + case SOCKS5Atyp::IPV6: recvr = InterruptibleRecv(pchRet3, 16, g_socks5_recv_timeout, sock); break; case SOCKS5Atyp::DOMAINNAME: { - recvr = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket); + recvr = InterruptibleRecv(pchRet3, 1, g_socks5_recv_timeout, sock); if (recvr != IntrRecvError::OK) { return error("Error reading from proxy"); } int nRecv = pchRet3[0]; - recvr = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket); + recvr = InterruptibleRecv(pchRet3, nRecv, g_socks5_recv_timeout, sock); break; } default: return error("Error: malformed proxy response"); @@ -558,41 +475,35 @@ static bool Socks5(const std::string& strDest, int port, const ProxyCredentials if (recvr != IntrRecvError::OK) { return error("Error reading from proxy"); } - if ((recvr = InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) { + if ((recvr = InterruptibleRecv(pchRet3, 2, g_socks5_recv_timeout, sock)) != IntrRecvError::OK) { return error("Error reading from proxy"); } LogPrint(BCLog::NET, "SOCKS5 connected %s\n", strDest); return true; } -/** - * Try to create a socket file descriptor with specific properties in the - * communications domain (address family) of the specified service. - * - * For details on the desired properties, see the inline comments in the source - * code. - */ -SOCKET CreateSocket(const CService &addrConnect) +std::unique_ptr<Sock> CreateSockTCP(const CService& address_family) { // Create a sockaddr from the specified service. struct sockaddr_storage sockaddr; socklen_t len = sizeof(sockaddr); - if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) { - LogPrintf("Cannot create socket for %s: unsupported network\n", addrConnect.ToString()); - return INVALID_SOCKET; + if (!address_family.GetSockAddr((struct sockaddr*)&sockaddr, &len)) { + LogPrintf("Cannot create socket for %s: unsupported network\n", address_family.ToString()); + return nullptr; } // Create a TCP socket in the address family of the specified service. SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP); - if (hSocket == INVALID_SOCKET) - return INVALID_SOCKET; + if (hSocket == INVALID_SOCKET) { + return nullptr; + } // Ensure that waiting for I/O on this socket won't result in undefined // behavior. if (!IsSelectableSocket(hSocket)) { CloseSocket(hSocket); LogPrintf("Cannot create connection: non-selectable socket created (fd >= FD_SETSIZE ?)\n"); - return INVALID_SOCKET; + return nullptr; } #ifdef SO_NOSIGPIPE @@ -608,11 +519,14 @@ SOCKET CreateSocket(const CService &addrConnect) // Set the non-blocking option on the socket. if (!SetSocketNonBlocking(hSocket, true)) { CloseSocket(hSocket); - LogPrintf("CreateSocket: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError())); + LogPrintf("Error setting socket to non-blocking: %s\n", NetworkErrorString(WSAGetLastError())); + return nullptr; } - return hSocket; + return std::make_unique<Sock>(hSocket); } +std::function<std::unique_ptr<Sock>(const CService&)> CreateSock = CreateSockTCP; + template<typename... Args> static void LogConnectFailure(bool manual_connection, const char* fmt, const Args&... args) { std::string error_message = tfm::format(fmt, args...); @@ -623,24 +537,12 @@ static void LogConnectFailure(bool manual_connection, const char* fmt, const Arg } } -/** - * Try to connect to the specified service on the specified socket. - * - * @param addrConnect The service to which to connect. - * @param hSocket The socket on which to connect. - * @param nTimeout Wait this many milliseconds for the connection to be - * established. - * @param manual_connection Whether or not the connection was manually requested - * (e.g. through the addnode RPC) - * - * @returns Whether or not a connection was successfully made. - */ -bool ConnectSocketDirectly(const CService &addrConnect, const SOCKET& hSocket, int nTimeout, bool manual_connection) +bool ConnectSocketDirectly(const CService &addrConnect, const Sock& sock, int nTimeout, bool manual_connection) { // Create a sockaddr from the specified service. struct sockaddr_storage sockaddr; socklen_t len = sizeof(sockaddr); - if (hSocket == INVALID_SOCKET) { + if (sock.Get() == INVALID_SOCKET) { LogPrintf("Cannot connect to %s: invalid socket\n", addrConnect.ToString()); return false; } @@ -650,8 +552,7 @@ bool ConnectSocketDirectly(const CService &addrConnect, const SOCKET& hSocket, i } // Connect to the addrConnect service on the hSocket socket. - if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR) - { + 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) @@ -659,46 +560,34 @@ bool ConnectSocketDirectly(const CService &addrConnect, const SOCKET& hSocket, i // 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. -#ifdef USE_POLL - struct pollfd pollfd = {}; - pollfd.fd = hSocket; - pollfd.events = POLLIN | POLLOUT; - int nRet = poll(&pollfd, 1, nTimeout); -#else - struct timeval timeout = MillisToTimeval(nTimeout); - fd_set fdset; - FD_ZERO(&fdset); - FD_SET(hSocket, &fdset); - int nRet = select(hSocket + 1, nullptr, &fdset, nullptr, &timeout); -#endif - // Upon successful completion, both select and poll return the total - // number of file descriptors that have been selected. A value of 0 - // indicates that the call timed out and no file descriptors have - // been selected. - if (nRet == 0) - { - LogPrint(BCLog::NET, "connection to %s timeout\n", addrConnect.ToString()); + const Sock::Event requested = Sock::RECV | Sock::SEND; + Sock::Event occurred; + if (!sock.Wait(std::chrono::milliseconds{nTimeout}, requested, &occurred)) { + LogPrintf("wait for connect to %s failed: %s\n", + addrConnect.ToString(), + NetworkErrorString(WSAGetLastError())); return false; - } - if (nRet == SOCKET_ERROR) - { - LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError())); + } else if (occurred == 0) { + LogPrint(BCLog::NET, "connection attempt to %s timed out\n", addrConnect.ToString()); return false; } - // Even if the select/poll was successful, the connect might not + // 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 - // nRet here. - socklen_t nRetSize = sizeof(nRet); - if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (sockopt_arg_type)&nRet, &nRetSize) == SOCKET_ERROR) - { + // 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", addrConnect.ToString(), NetworkErrorString(WSAGetLastError())); return false; } - if (nRet != 0) - { - LogConnectFailure(manual_connection, "connect() to %s failed after select(): %s", addrConnect.ToString(), NetworkErrorString(nRet)); + if (sockerr != 0) { + LogConnectFailure(manual_connection, + "connect() to %s failed after wait: %s", + addrConnect.ToString(), + NetworkErrorString(sockerr)); return false; } } @@ -733,22 +622,6 @@ bool GetProxy(enum Network net, proxyType &proxyInfoOut) { return true; } -/** - * Set the name proxy to use for all connections to nodes specified by a - * hostname. After setting this proxy, connecting to a node specified by a - * hostname won't result in a local lookup of said hostname, rather, connect to - * the node by asking the name proxy for a proxy connection to the hostname, - * effectively delegating the hostname lookup to the specified proxy. - * - * This delegation increases privacy for those who set the name proxy as they no - * longer leak their external hostname queries to their DNS servers. - * - * @returns Whether or not the operation succeeded. - * - * @note SOCKS5's support for UDP-over-SOCKS5 has been considered, but no SOCK5 - * server in common use (most notably Tor) actually implements UDP - * support, and a DNS resolver is beyond the scope of this project. - */ bool SetNameProxy(const proxyType &addrProxy) { if (!addrProxy.IsValid()) return false; @@ -779,25 +652,10 @@ bool IsProxy(const CNetAddr &addr) { return false; } -/** - * Connect to a specified destination service through a SOCKS5 proxy by first - * connecting to the SOCKS5 proxy. - * - * @param proxy The SOCKS5 proxy. - * @param strDest The destination service to which to connect. - * @param port The destination port. - * @param hSocket The socket on which to connect to the SOCKS5 proxy. - * @param nTimeout Wait this many milliseconds for the connection to the SOCKS5 - * proxy to be established. - * @param[out] outProxyConnectionFailed Whether or not the connection to the - * SOCKS5 proxy failed. - * - * @returns Whether or not the operation succeeded. - */ -bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, const SOCKET& hSocket, int nTimeout, bool& outProxyConnectionFailed) +bool ConnectThroughProxy(const proxyType& proxy, const std::string& strDest, uint16_t port, const Sock& sock, int nTimeout, bool& outProxyConnectionFailed) { // first connect to proxy server - if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout, true)) { + if (!ConnectSocketDirectly(proxy.proxy, sock, nTimeout, true)) { outProxyConnectionFailed = true; return false; } @@ -806,29 +664,18 @@ bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int ProxyCredentials random_auth; static std::atomic_int counter(0); random_auth.username = random_auth.password = strprintf("%i", counter++); - if (!Socks5(strDest, (uint16_t)port, &random_auth, hSocket)) { + if (!Socks5(strDest, port, &random_auth, sock)) { return false; } } else { - if (!Socks5(strDest, (uint16_t)port, 0, hSocket)) { + if (!Socks5(strDest, port, 0, sock)) { return false; } } return true; } -/** - * Parse and resolve a specified subnet string into the appropriate internal - * representation. - * - * @param strSubnet A string representation of a subnet of the form `network - * address [ "/", ( CIDR-style suffix | netmask ) ]`(e.g. - * `2001:db8::/32`, `192.0.2.0/255.255.255.0`, or `8.8.8.8`). - * @param ret The resulting internal representation of a subnet. - * - * @returns Whether the operation succeeded or not. - */ -bool LookupSubNet(const std::string& strSubnet, CSubNet& ret) +bool LookupSubNet(const std::string& strSubnet, CSubNet& ret, DNSLookupFn dns_lookup_function) { if (!ValidAsCString(strSubnet)) { return false; @@ -839,7 +686,7 @@ bool LookupSubNet(const std::string& strSubnet, CSubNet& ret) std::string strAddress = strSubnet.substr(0, slash); // TODO: Use LookupHost(const std::string&, CNetAddr&, bool) instead to just get // one CNetAddr. - if (LookupHost(strAddress, vIP, 1, false)) + if (LookupHost(strAddress, vIP, 1, false, dns_lookup_function)) { CNetAddr network = vIP[0]; if (slash != strSubnet.npos) @@ -854,7 +701,7 @@ bool LookupSubNet(const std::string& strSubnet, CSubNet& ret) else // If not a valid number, try full netmask syntax { // Never allow lookup for netmask - if (LookupHost(strNetmask, vIP, 1, false)) { + if (LookupHost(strNetmask, vIP, 1, false, dns_lookup_function)) { ret = CSubNet(network, vIP[0]); return ret.IsValid(); } @@ -869,57 +716,6 @@ bool LookupSubNet(const std::string& strSubnet, CSubNet& ret) return false; } -#ifdef WIN32 -std::string NetworkErrorString(int err) -{ - wchar_t buf[256]; - buf[0] = 0; - if(FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK, - nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), - buf, ARRAYSIZE(buf), nullptr)) - { - return strprintf("%s (%d)", std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t>().to_bytes(buf), err); - } - else - { - return strprintf("Unknown error (%d)", err); - } -} -#else -std::string NetworkErrorString(int err) -{ - char buf[256]; - buf[0] = 0; - /* Too bad there are two incompatible implementations of the - * thread-safe strerror. */ - const char *s; -#ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */ - s = strerror_r(err, buf, sizeof(buf)); -#else /* POSIX variant always returns message in buffer */ - s = buf; - if (strerror_r(err, buf, sizeof(buf))) - buf[0] = 0; -#endif - return strprintf("%s (%d)", s, err); -} -#endif - -bool CloseSocket(SOCKET& hSocket) -{ - if (hSocket == INVALID_SOCKET) - return false; -#ifdef WIN32 - int ret = closesocket(hSocket); -#else - int ret = close(hSocket); -#endif - if (ret) { - LogPrintf("Socket close failed: %d. Error: %s\n", hSocket, NetworkErrorString(WSAGetLastError())); - } - hSocket = INVALID_SOCKET; - return ret != SOCKET_ERROR; -} - bool SetSocketNonBlocking(const SOCKET& hSocket, bool fNonBlocking) { if (fNonBlocking) { |