diff --git a/doc/Tor.txt b/doc/Tor.txt new file mode 100644 index 000000000..f44b016f2 --- /dev/null +++ b/doc/Tor.txt @@ -0,0 +1,96 @@ +TOR SUPPORT IN BITCOIN +====================== + +It is possible to run Bitcoin as a Tor hidden service, and connect to such services. + +The following assumes you have a Tor proxy running on port 9050. Many distributions +default to having a SOCKS proxy listening on port 9050, but others may not. +In particular, the Tor Browser Bundle defaults to listening on a random port. See +https://www.torproject.org/docs/faq.html.en#TBBSocksPort for how to properly +configure Tor. + + +1. Run bitcoin behind a Tor proxy +--------------------------------- + +The first step is running Bitcoin behind a Tor proxy. This will already make all +outgoing connections be anonimized, but more is possible. + +-socks=5 SOCKS5 supports connecting-to-hostname, which can be used instead + of doing a (leaking) local DNS lookup. SOCKS5 is the default, + but SOCKS4 does not support this. (SOCKS4a does, but isn't + implemented). + +-proxy=ip:port Set the proxy server. If SOCKS5 is selected (default), this proxy + server will be used to try to reach .onion addresses as well. + +-tor=ip:port Set the proxy server to use for tor hidden services. You do not + need to set this if it's the same as -proxy. You can use -notor + to explicitly disable access to hidden service. + +-dnsseed DNS seeds are not resolved directly when a SOCKS5 proxy server is + set. Rather, a short-lived proxy connection to the dns seed + hostname is attempted, and peer addresses are requested. + +-listen When using -proxy, listening is disabled by default. If you want + to run a hidden service (see next section), you'll need to enable + it explicitly. + +-connect=X When behing a Tor proxy, you can specify .onion addresses instead +-addnode=X of IP addresses or hostnames in these parameters. It requires +-seednode=X SOCKS5. In Tor mode, such addresses can also be exchanged with + other P2P nodes. + +In a typical situation, this suffices to run behind a Tor proxy: + + ./bitcoin -proxy=127.0.0.1:9050 + + +2. Run a bitcoin hidden server +------------------------------ + +If you configure your Tor system accordingly, it is possible to make your node also +reachable from the Tor network. Add these lines to your /etc/tor/torrc (or equivalent +config file): + + HiddenServiceDir /var/lib/tor/bitcoin-service/ + HiddenServicePort 8333 127.0.0.1:8333 + +The directory can be different of course, but (both) 8333's should be equal to your +bitcoind's P2P listen port (8333 by default). + +-externalip=X You can tell bitcoin about its publically reachable address using + this option, and this can be a .onion address. Given the above + configuration, you can find your onion address in + /var/lib/tor/bitcoin-service/hostname. Onion addresses are given + preference for your node to advertize itself with, for connections + coming from unroutable addresses (such as 127.0.0.1, where the + Tor proxy typically runs). + +-listen You'll need to enable listening for incoming connections, as this + is off by default behind a proxy. + +-discover When -externalip is specified, no attempt is made to discover local + IPv4 or IPv6 addresses. If you want to run a dual stack, reachable + from both Tor and IPv4 (or IPv6), you'll need to either pass your + other addresses using -externalip, or explicitly enable -discover. + Note that both addresses of a dual-stack system may be easily + linkable using traffic analysis. + +In a typical situation, where you're only reachable via Tor, this should suffice: + + ./bitcoind -proxy=127.0.0.1:9050 -externalip=57qr3yd1nyntf5k.onion -listen + +(obviously replace the Onion address with your own). If you don't care too much +about hiding your node, and want to be reachable on IPv4 as well, additionally +specify: + + ./bitcoind ... -discover + +and open port 8333 on your firewall (or use -upnp). + +If you only want to use Tor to reach onion addresses, but not use it as a proxy +for normal IPv4/IPv6 communication, use: + + ./bitcoin -tor=127.0.0.1:9050 -externalip=57qr3yd1nyntf5k.onion -discover + diff --git a/src/init.cpp b/src/init.cpp index 21c32a6d6..b148c5008 100644 --- a/src/init.cpp +++ b/src/init.cpp @@ -222,6 +222,7 @@ std::string HelpMessage() " -timeout= " + _("Specify connection timeout (in milliseconds)") + "\n" + " -proxy= " + _("Connect through socks proxy") + "\n" + " -socks= " + _("Select the version of socks proxy to use (4-5, default: 5)") + "\n" + + " -tor= " + _("Use proxy to reach tor hidden services (default: same as -proxy)") + "\n" " -dns " + _("Allow DNS lookups for -addnode, -seednode and -connect") + "\n" + " -port= " + _("Listen for connections on (default: 8333 or testnet: 18333)") + "\n" + " -maxconnections= " + _("Maintain at most connections to peers (default: 125)") + "\n" + @@ -229,12 +230,12 @@ std::string HelpMessage() " -connect= " + _("Connect only to the specified node(s)") + "\n" + " -seednode= " + _("Connect to a node to retrieve peer addresses, and disconnect") + "\n" + " -externalip= " + _("Specify your own public address") + "\n" + - " -onlynet= " + _("Only connect to nodes in network (IPv4 or IPv6)") + "\n" + + " -onlynet= " + _("Only connect to nodes in network (IPv4, IPv6 or Tor)") + "\n" + " -discover " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n" + " -irc " + _("Find peers using internet relay chat (default: 0)") + "\n" + " -listen " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n" + " -bind= " + _("Bind to given address. Use [host]:port notation for IPv6") + "\n" + - " -dnsseed " + _("Find peers using DNS lookup (default: 1)") + "\n" + + " -dnsseed " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n" + " -banscore= " + _("Threshold for disconnecting misbehaving peers (default: 100)") + "\n" + " -bantime= " + _("Number of seconds to keep misbehaving peers from reconnecting (default: 86400)") + "\n" + " -maxreceivebuffer= " + _("Maximum per-connection receive buffer, *1000 bytes (default: 10000)") + "\n" + @@ -476,8 +477,10 @@ bool AppInit2() } } + CService addrProxy; + bool fProxy = false; if (mapArgs.count("-proxy")) { - CService addrProxy = CService(mapArgs["-proxy"], 9050); + addrProxy = CService(mapArgs["-proxy"], 9050); if (!addrProxy.IsValid()) return InitError(strprintf(_("Invalid -proxy address: '%s'"), mapArgs["-proxy"].c_str())); @@ -490,6 +493,20 @@ bool AppInit2() #endif SetNameProxy(addrProxy, nSocksVersion); } + fProxy = true; + } + + // -tor can override normal proxy, -notor disables tor entirely + if (!(mapArgs.count("-tor") && mapArgs["-tor"] == "0") && (fProxy || mapArgs.count("-tor"))) { + CService addrOnion; + if (!mapArgs.count("-tor")) + addrOnion = addrProxy; + else + addrOnion = CService(mapArgs["-tor"], 9050); + if (!addrOnion.IsValid()) + return InitError(strprintf(_("Invalid -tor address: '%s'"), mapArgs["-tor"].c_str())); + SetProxy(NET_TOR, addrOnion, 5); + SetReachable(NET_TOR); } // see Step 2: parameter interactions for more information about these diff --git a/src/main.cpp b/src/main.cpp index 27802a498..b46866221 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -2426,7 +2426,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv) pfrom->fSuccessfullyConnected = true; - printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight); + printf("receive version message: version %d, blocks=%d, us=%s, them=%s, peer=%s\n", pfrom->nVersion, pfrom->nStartingHeight, addrMe.ToString().c_str(), addrFrom.ToString().c_str(), pfrom->addr.ToString().c_str()); cPeerBlockCounts.input(pfrom->nStartingHeight); } diff --git a/src/net.cpp b/src/net.cpp index 804cb0f54..77fd334ee 100644 --- a/src/net.cpp +++ b/src/net.cpp @@ -206,6 +206,14 @@ void static AdvertizeLocal() } } +void SetReachable(enum Network net, bool fFlag) +{ + LOCK(cs_mapLocalHost); + vfReachable[net] = fFlag; + if (net == NET_IPV6 && fFlag) + vfReachable[NET_IPV4] = true; +} + // learn a new local address bool AddLocal(const CService& addr, int nScore) { @@ -228,9 +236,7 @@ bool AddLocal(const CService& addr, int nScore) info.nScore = nScore; info.nPort = addr.GetPort() + (fAlready ? 1 : 0); } - enum Network net = addr.GetNetwork(); - vfReachable[net] = true; - if (net == NET_IPV6) vfReachable[NET_IPV4] = true; + SetReachable(addr.GetNetwork()); } AdvertizeLocal(); @@ -543,6 +549,7 @@ void CNode::PushVersion() CAddress addrYou = (addr.IsRoutable() && !IsProxy(addr) ? addr : CAddress(CService("0.0.0.0",0))); CAddress addrMe = GetLocalAddress(&addr); RAND_bytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce)); + printf("send version message: version %d, blocks=%d, us=%s, them=%s, peer=%s\n", PROTOCOL_VERSION, nBestHeight, addrMe.ToString().c_str(), addrYou.ToString().c_str(), addr.ToString().c_str()); PushMessage("version", PROTOCOL_VERSION, nLocalServices, nTime, addrYou, addrMe, nLocalHostNonce, FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, std::vector()), nBestHeight); } diff --git a/src/net.h b/src/net.h index f059c7a44..29b116eb3 100644 --- a/src/net.h +++ b/src/net.h @@ -64,6 +64,7 @@ bool SeenLocal(const CService& addr); bool IsLocal(const CService& addr); bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL); bool IsReachable(const CNetAddr &addr); +void SetReachable(enum Network net, bool fFlag = true); CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL); diff --git a/src/netbase.cpp b/src/netbase.cpp index ffd3ea68a..aa767cd3e 100644 --- a/src/netbase.cpp +++ b/src/netbase.cpp @@ -57,6 +57,15 @@ void SplitHostPort(std::string in, int &portOut, std::string &hostOut) { bool static LookupIntern(const char *pszName, std::vector& vIP, unsigned int nMaxSolutions, bool fAllowLookup) { vIP.clear(); + + { + CNetAddr addr; + if (addr.SetSpecial(std::string(pszName))) { + vIP.push_back(addr); + return true; + } + } + struct addrinfo aiHint; memset(&aiHint, 0, sizeof(struct addrinfo)); @@ -530,6 +539,32 @@ void CNetAddr::SetIP(const CNetAddr& ipIn) memcpy(ip, ipIn.ip, sizeof(ip)); } +static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43}; +static const unsigned char pchGarliCat[] = {0xFD,0x60,0xDB,0x4D,0xDD,0xB5}; + +bool CNetAddr::SetSpecial(const std::string &strName) +{ + if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") { + std::vector vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str()); + if (vchAddr.size() != 16-sizeof(pchOnionCat)) + return false; + memcpy(ip, pchOnionCat, sizeof(pchOnionCat)); + for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++) + ip[i + sizeof(pchOnionCat)] = vchAddr[i]; + return true; + } + if (strName.size()>11 && strName.substr(strName.size() - 11, 11) == ".oc.b32.i2p") { + std::vector vchAddr = DecodeBase32(strName.substr(0, strName.size() - 11).c_str()); + if (vchAddr.size() != 16-sizeof(pchGarliCat)) + return false; + memcpy(ip, pchOnionCat, sizeof(pchGarliCat)); + for (unsigned int i=0; i<16-sizeof(pchGarliCat); i++) + ip[i + sizeof(pchGarliCat)] = vchAddr[i]; + return true; + } + return false; +} + CNetAddr::CNetAddr() { Init(); @@ -576,7 +611,7 @@ bool CNetAddr::IsIPv4() const bool CNetAddr::IsIPv6() const { - return (!IsIPv4()); + return (!IsIPv4() && !IsTor() && !IsI2P()); } bool CNetAddr::IsRFC1918() const @@ -635,15 +670,13 @@ bool CNetAddr::IsRFC4843() const return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10); } -bool CNetAddr::IsOnionCat() const +bool CNetAddr::IsTor() const { - static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43}; return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0); } -bool CNetAddr::IsGarliCat() const +bool CNetAddr::IsI2P() const { - static const unsigned char pchGarliCat[] = {0xFD,0x60,0xDB,0x4D,0xDD,0xB5}; return (memcmp(ip, pchGarliCat, sizeof(pchGarliCat)) == 0); } @@ -705,7 +738,7 @@ bool CNetAddr::IsValid() const bool CNetAddr::IsRoutable() const { - return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsOnionCat() && !IsGarliCat()) || IsRFC4843() || IsLocal()); + return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsTor() && !IsI2P()) || IsRFC4843() || IsLocal()); } enum Network CNetAddr::GetNetwork() const @@ -716,10 +749,10 @@ enum Network CNetAddr::GetNetwork() const if (IsIPv4()) return NET_IPV4; - if (IsOnionCat()) + if (IsTor()) return NET_TOR; - if (IsGarliCat()) + if (IsI2P()) return NET_I2P; return NET_IPV6; @@ -727,6 +760,10 @@ enum Network CNetAddr::GetNetwork() const std::string CNetAddr::ToStringIP() const { + if (IsTor()) + return EncodeBase32(&ip[6], 10) + ".onion"; + if (IsI2P()) + return EncodeBase32(&ip[6], 10) + ".oc.b32.i2p"; CService serv(*this, 0); #ifdef USE_IPV6 struct sockaddr_storage sockaddr; @@ -739,7 +776,7 @@ std::string CNetAddr::ToStringIP() const if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), NULL, 0, NI_NUMERICHOST)) return std::string(name); } - if (IsIPv4()) + if (IsIPv4()) return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0)); else return strprintf("%x:%x:%x:%x:%x:%x:%x:%x", @@ -828,6 +865,18 @@ std::vector CNetAddr::GetGroup() const vchRet.push_back(GetByte(2) ^ 0xFF); return vchRet; } + else if (IsTor()) + { + nClass = NET_TOR; + nStartByte = 6; + nBits = 4; + } + else if (IsI2P()) + { + nClass = NET_I2P; + nStartByte = 6; + nBits = 4; + } // for he.net, use /36 groups else if (GetByte(15) == 0x20 && GetByte(14) == 0x11 && GetByte(13) == 0x04 && GetByte(12) == 0x70) nBits = 36; @@ -861,27 +910,82 @@ void CNetAddr::print() const printf("CNetAddr(%s)\n", ToString().c_str()); } -// for IPv6 partners: for unknown/Teredo partners: for IPv4 partners: -// 0 - unroutable // 0 - unroutable // 0 - unroutable -// 1 - teredo // 1 - teredo // 1 - ipv4 -// 2 - tunneled ipv6 // 2 - tunneled ipv6 -// 3 - ipv4 // 3 - ipv6 -// 4 - ipv6 // 4 - ipv4 +// private extensions to enum Network, only returned by GetExtNetwork, +// and only used in GetReachabilityFrom +static const int NET_UNKNOWN = NET_MAX + 0; +static const int NET_TEREDO = NET_MAX + 1; +int static GetExtNetwork(const CNetAddr *addr) +{ + if (addr == NULL) + return NET_UNKNOWN; + if (addr->IsRFC4380()) + return NET_TEREDO; + return addr->GetNetwork(); +} + +/** Calculates a metric for how reachable (*this) is from a given partner */ int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const { - if (!IsValid() || !IsRoutable()) - return 0; - if (paddrPartner && paddrPartner->IsIPv4()) - return IsIPv4() ? 1 : 0; - if (IsRFC4380()) - return 1; - if (IsRFC3964() || IsRFC6052()) - return 2; - bool fRealIPv6 = paddrPartner && !paddrPartner->IsRFC4380() && paddrPartner->IsValid() && paddrPartner->IsRoutable(); - if (fRealIPv6) - return IsIPv4() ? 3 : 4; - else - return IsIPv4() ? 4 : 3; + enum Reachability { + REACH_UNREACHABLE, + REACH_DEFAULT, + REACH_TEREDO, + REACH_IPV6_WEAK, + REACH_IPV4, + REACH_IPV6_STRONG, + REACH_PRIVATE + }; + + if (!IsRoutable()) + return REACH_UNREACHABLE; + + int ourNet = GetExtNetwork(this); + int theirNet = GetExtNetwork(paddrPartner); + bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145(); + + switch(theirNet) { + case NET_IPV4: + switch(ourNet) { + default: return REACH_DEFAULT; + case NET_IPV4: return REACH_IPV4; + } + case NET_IPV6: + switch(ourNet) { + default: return REACH_DEFAULT; + case NET_TEREDO: return REACH_TEREDO; + case NET_IPV4: return REACH_IPV4; + case NET_IPV6: return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunneled + } + case NET_TOR: + switch(ourNet) { + default: return REACH_DEFAULT; + case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well + case NET_TOR: return REACH_PRIVATE; + } + case NET_I2P: + switch(ourNet) { + default: return REACH_DEFAULT; + case NET_I2P: return REACH_PRIVATE; + } + case NET_TEREDO: + switch(ourNet) { + default: return REACH_DEFAULT; + case NET_TEREDO: return REACH_TEREDO; + case NET_IPV6: return REACH_IPV6_WEAK; + case NET_IPV4: return REACH_IPV4; + } + case NET_UNKNOWN: + case NET_UNROUTABLE: + default: + switch(ourNet) { + default: return REACH_DEFAULT; + case NET_TEREDO: return REACH_TEREDO; + case NET_IPV6: return REACH_IPV6_WEAK; + case NET_IPV4: return REACH_IPV4; + case NET_I2P: return REACH_PRIVATE; // assume connections from unroutable addresses are + case NET_TOR: return REACH_PRIVATE; // either from Tor/I2P, or don't care about our address + } + } } void CService::Init() @@ -1036,7 +1140,7 @@ std::string CService::ToStringPort() const std::string CService::ToStringIPPort() const { - if (IsIPv4()) { + if (IsIPv4() || IsTor() || IsI2P()) { return ToStringIP() + ":" + ToStringPort(); } else { return "[" + ToStringIP() + "]:" + ToStringPort(); diff --git a/src/netbase.h b/src/netbase.h index 7a797e2fd..f097d7f5a 100644 --- a/src/netbase.h +++ b/src/netbase.h @@ -25,7 +25,7 @@ enum Network NET_TOR, NET_I2P, - NET_MAX + NET_MAX, }; extern int nConnectTimeout; @@ -44,8 +44,9 @@ class CNetAddr explicit CNetAddr(const std::string &strIp, bool fAllowLookup = false); void Init(); void SetIP(const CNetAddr& ip); + bool SetSpecial(const std::string &strName); // for Tor and I2P addresses bool IsIPv4() const; // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0) - bool IsIPv6() const; // IPv6 address (not IPv4) + bool IsIPv6() const; // IPv6 address (not mapped IPv4, not Tor/I2P) bool IsRFC1918() const; // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12) bool IsRFC3849() const; // IPv6 documentation address (2001:0DB8::/32) bool IsRFC3927() const; // IPv4 autoconfig (169.254.0.0/16) @@ -56,8 +57,8 @@ class CNetAddr bool IsRFC4862() const; // IPv6 autoconfig (FE80::/64) bool IsRFC6052() const; // IPv6 well-known prefix (64:FF9B::/96) bool IsRFC6145() const; // IPv6 IPv4-translated address (::FFFF:0:0:0/96) - bool IsOnionCat() const; - bool IsGarliCat() const; + bool IsTor() const; + bool IsI2P() const; bool IsLocal() const; bool IsRoutable() const; bool IsValid() const; diff --git a/src/test/base32_tests.cpp b/src/test/base32_tests.cpp new file mode 100644 index 000000000..fdf328591 --- /dev/null +++ b/src/test/base32_tests.cpp @@ -0,0 +1,20 @@ +#include + +#include "util.h" + +BOOST_AUTO_TEST_SUITE(base32_tests) + +BOOST_AUTO_TEST_CASE(base32_testvectors) +{ + static const std::string vstrIn[] = {"","f","fo","foo","foob","fooba","foobar"}; + static const std::string vstrOut[] = {"","my======","mzxq====","mzxw6===","mzxw6yq=","mzxw6ytb","mzxw6ytboi======"}; + for (unsigned int i=0; i> 3]; + left = (enc & 7) << 2; + mode = 1; + break; + + case 1: // we have three bits + strRet += pbase32[left | (enc >> 6)]; + strRet += pbase32[(enc >> 1) & 31]; + left = (enc & 1) << 4; + mode = 2; + break; + + case 2: // we have one bit + strRet += pbase32[left | (enc >> 4)]; + left = (enc & 15) << 1; + mode = 3; + break; + + case 3: // we have four bits + strRet += pbase32[left | (enc >> 7)]; + strRet += pbase32[(enc >> 2) & 31]; + left = (enc & 3) << 3; + mode = 4; + break; + + case 4: // we have two bits + strRet += pbase32[left | (enc >> 5)]; + strRet += pbase32[enc & 31]; + mode = 0; + } + } + + static const int nPadding[5] = {0, 6, 4, 3, 1}; + if (mode) + { + strRet += pbase32[left]; + for (int n=0; n DecodeBase32(const char* p, bool* pfInvalid) +{ + static const int decode32_table[256] = + { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, + -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 0, 1, 2, + 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, + 23, 24, 25, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 + }; + + if (pfInvalid) + *pfInvalid = false; + + vector vchRet; + vchRet.reserve((strlen(p))*5/8); + + int mode = 0; + int left = 0; + + while (1) + { + int dec = decode32_table[(unsigned char)*p]; + if (dec == -1) break; + p++; + switch (mode) + { + case 0: // we have no bits and get 5 + left = dec; + mode = 1; + break; + + case 1: // we have 5 bits and keep 2 + vchRet.push_back((left<<3) | (dec>>2)); + left = dec & 3; + mode = 2; + break; + + case 2: // we have 2 bits and keep 7 + left = left << 5 | dec; + mode = 3; + break; + + case 3: // we have 7 bits and keep 4 + vchRet.push_back((left<<1) | (dec>>4)); + left = dec & 15; + mode = 4; + break; + + case 4: // we have 4 bits, and keep 1 + vchRet.push_back((left<<4) | (dec>>1)); + left = dec & 1; + mode = 5; + break; + + case 5: // we have 1 bit, and keep 6 + left = left << 5 | dec; + mode = 6; + break; + + case 6: // we have 6 bits, and keep 3 + vchRet.push_back((left<<2) | (dec>>3)); + left = dec & 7; + mode = 7; + break; + + case 7: // we have 3 bits, and keep 0 + vchRet.push_back((left<<5) | dec); + mode = 0; + break; + } + } + + if (pfInvalid) + switch (mode) + { + case 0: // 8n base32 characters processed: ok + break; + + case 1: // 8n+1 base32 characters processed: impossible + case 3: // +3 + case 6: // +6 + *pfInvalid = true; + break; + + case 2: // 8n+2 base32 characters processed: require '======' + if (left || p[0] != '=' || p[1] != '=' || p[2] != '=' || p[3] != '=' || p[4] != '=' || p[5] != '=' || decode32_table[(unsigned char)p[6]] != -1) + *pfInvalid = true; + break; + + case 4: // 8n+4 base32 characters processed: require '====' + if (left || p[0] != '=' || p[1] != '=' || p[2] != '=' || p[3] != '=' || decode32_table[(unsigned char)p[4]] != -1) + *pfInvalid = true; + break; + + case 5: // 8n+5 base32 characters processed: require '===' + if (left || p[0] != '=' || p[1] != '=' || p[2] != '=' || decode32_table[(unsigned char)p[3]] != -1) + *pfInvalid = true; + break; + + case 7: // 8n+7 base32 characters processed: require '=' + if (left || p[0] != '=' || decode32_table[(unsigned char)p[1]] != -1) + *pfInvalid = true; + break; + } + + return vchRet; +} + +string DecodeBase32(const string& str) +{ + vector vchRet = DecodeBase32(str.c_str()); + return string((const char*)&vchRet[0], vchRet.size()); +} + bool WildcardMatch(const char* psz, const char* mask) { diff --git a/src/util.h b/src/util.h index 21bec68ae..7b2c67891 100644 --- a/src/util.h +++ b/src/util.h @@ -147,6 +147,10 @@ std::vector DecodeBase64(const char* p, bool* pfInvalid = NULL); std::string DecodeBase64(const std::string& str); std::string EncodeBase64(const unsigned char* pch, size_t len); std::string EncodeBase64(const std::string& str); +std::vector DecodeBase32(const char* p, bool* pfInvalid = NULL); +std::string DecodeBase32(const std::string& str); +std::string EncodeBase32(const unsigned char* pch, size_t len); +std::string EncodeBase32(const std::string& str); void ParseParameters(int argc, const char*const argv[]); bool WildcardMatch(const char* psz, const char* mask); bool WildcardMatch(const std::string& str, const std::string& mask);