diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/netbase.cpp | 103 | ||||
| -rw-r--r-- | src/netbase.h | 2 |
2 files changed, 74 insertions, 31 deletions
diff --git a/src/netbase.cpp b/src/netbase.cpp index 21fca4737a..aa767cd3eb 100644 --- a/src/netbase.cpp +++ b/src/netbase.cpp @@ -910,39 +910,82 @@ void CNetAddr::print() const printf("CNetAddr(%s)\n", ToString().c_str()); } -// for IPv6 partners: for unknown/Teredo partners: for IPv4 partners: for Tor partners: for I2P partners: -// 0 - unroutable // 0 - unroutable // 0 - unroutable // 0 - unroutable // 0 - unroutable -// 1 - teredo // 1 - teredo // 1 - ipv4 // 1 - the rest // 1 - the rest -// 2 - tunneled ipv6 // 2 - tunneled ipv6 // 2 - ip4 // 2 - I2P -// 3 - ipv4 // 3 - ipv6 // 3 - tor -// 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 (paddrPartner && paddrPartner->IsTor()) { - if (IsIPv4()) - return 2; - if (IsTor()) - return 3; - return 1; - } - if (paddrPartner && paddrPartner->IsI2P()) { - if (IsI2P()) - return 2; - return 1; + 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 + } } - 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; } void CService::Init() diff --git a/src/netbase.h b/src/netbase.h index 36f29b0b32..f097d7f5ae 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; |