137 lines
3.2 KiB
C++
137 lines
3.2 KiB
C++
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// HostnameLookup.cpp
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// Implements the cHostnameLookup class representing an in-progress hostname-to-IP lookup
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#include "Globals.h"
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#include "HostnameLookup.h"
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#include "NetworkSingleton.h"
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#include "GetAddressInfoError.h"
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////////////////////////////////////////////////////////////////////////////////
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// cHostnameLookup:
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cHostnameLookup::cHostnameLookup(const AString & a_Hostname, cNetwork::cResolveNameCallbacksPtr a_Callbacks):
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m_Callbacks(std::move(a_Callbacks)),
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m_Hostname(a_Hostname)
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{
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}
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void cHostnameLookup::Lookup(const AString & a_Hostname, cNetwork::cResolveNameCallbacksPtr a_Callbacks)
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{
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// Cannot use std::make_shared here, constructor is not accessible
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cHostnameLookupPtr Lookup{ new cHostnameLookup(a_Hostname, std::move(a_Callbacks)) };
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// Note the Lookup object is owned solely by this lambda which is destroyed after it runs
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cNetworkSingleton::Get().GetLookupThread().ScheduleLookup([=]()
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{
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// Start the lookup:
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addrinfo hints;
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memset(&hints, 0, sizeof(hints));
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hints.ai_protocol = IPPROTO_TCP;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_family = AF_UNSPEC;
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hints.ai_flags = AI_CANONNAME;
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addrinfo * Result;
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int ErrCode = getaddrinfo(Lookup->m_Hostname.c_str(), nullptr, &hints, &Result);
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Lookup->Callback(ErrCode, Result);
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});
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}
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void cHostnameLookup::Callback(int a_ErrCode, addrinfo * a_Addr)
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{
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// If an error has occurred, notify the error callback:
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if (a_ErrCode != 0)
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{
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m_Callbacks->OnError(a_ErrCode, ErrorString(a_ErrCode));
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return;
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}
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// Call the success handler for each entry received:
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bool HasResolved = false;
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addrinfo * OrigAddr = a_Addr;
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for (;a_Addr != nullptr; a_Addr = a_Addr->ai_next)
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{
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char IP[128];
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switch (a_Addr->ai_family)
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{
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case AF_INET: // IPv4
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{
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sockaddr_in * sin = reinterpret_cast<sockaddr_in *>(a_Addr->ai_addr);
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if (!m_Callbacks->OnNameResolvedV4(m_Hostname, sin))
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{
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// Callback indicated that the IP shouldn't be serialized to a string, just continue with the next address:
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HasResolved = true;
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continue;
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}
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evutil_inet_ntop(AF_INET, &(sin->sin_addr), IP, sizeof(IP));
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break;
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}
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case AF_INET6: // IPv6
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{
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sockaddr_in6 * sin = reinterpret_cast<sockaddr_in6 *>(a_Addr->ai_addr);
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if (!m_Callbacks->OnNameResolvedV6(m_Hostname, sin))
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{
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// Callback indicated that the IP shouldn't be serialized to a string, just continue with the next address:
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HasResolved = true;
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continue;
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}
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evutil_inet_ntop(AF_INET6, &(sin->sin6_addr), IP, sizeof(IP));
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break;
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}
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default:
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{
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// Unknown address family, handle as if this entry wasn't received
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continue; // for (a_Addr)
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}
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}
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m_Callbacks->OnNameResolved(m_Hostname, IP);
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HasResolved = true;
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} // for (a_Addr)
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// If only unsupported families were reported, call the Error handler:
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if (!HasResolved)
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{
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m_Callbacks->OnError(EAI_NONAME, ErrorString(EAI_NONAME));
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}
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else
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{
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m_Callbacks->OnFinished();
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}
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freeaddrinfo(OrigAddr);
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}
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////////////////////////////////////////////////////////////////////////////////
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// cNetwork API:
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bool cNetwork::HostnameToIP(
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const AString & a_Hostname,
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cNetwork::cResolveNameCallbacksPtr a_Callbacks
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)
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{
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cHostnameLookup::Lookup(a_Hostname, std::move(a_Callbacks));
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return true;
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}
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