CNetAddr: Add IsBindAny method to check for INADDR_ANY

src/netaddress.cpp

@@ -83,6 +83,16 @@ unsigned int CNetAddr::GetByte(int n) const
     return ip[15-n];
 }
 
+bool CNetAddr::IsBindAny() const
+{
+    const int cmplen = IsIPv4() ? 4 : 16;
+    for (int i = 0; i < cmplen; ++i) {
+        if (GetByte(i)) return false;
+    }
+
+    return true;
+}
+
 bool CNetAddr::IsIPv4() const
 {
     return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);

src/netaddress.h

@@ -55,6 +55,7 @@ class CNetAddr
         bool SetInternal(const std::string& name);
 
         bool SetSpecial(const std::string &strName); // for Tor addresses
+        bool IsBindAny() const; // INADDR_ANY equivalent
         bool IsIPv4() const;    // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
         bool IsIPv6() const;    // IPv6 address (not mapped IPv4, not Tor)
         bool IsRFC1918() const; // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)