net: create GetNetworkNames()

src/netaddress.h

@@ -36,7 +36,7 @@ static constexpr int ADDRV2_FORMAT = 0x20000000;
  * @note An address may belong to more than one network, for example `10.0.0.1`
  * belongs to both `NET_UNROUTABLE` and `NET_IPV4`.
  * Keep these sequential starting from 0 and `NET_MAX` as the last entry.
- * We have loops like `for (int i = 0; i < NET_MAX; i++)` that expect to iterate
+ * We have loops like `for (int i = 0; i < NET_MAX; ++i)` that expect to iterate
  * over all enum values and also `GetExtNetwork()` "extends" this enum by
  * introducing standalone constants starting from `NET_MAX`.
  */

src/netbase.cpp

@@ -68,6 +68,20 @@ std::string GetNetworkName(enum Network net)
     assert(false);
 }
 
+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_I2P || network == NET_CJDNS || network == NET_INTERNAL) continue;
+        names.emplace_back(GetNetworkName(network));
+    }
+    if (append_unroutable) {
+        names.emplace_back(GetNetworkName(NET_UNROUTABLE));
+    }
+    return names;
+}
+
 bool static LookupIntern(const std::string& name, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
 {
     vIP.clear();

src/netbase.h

@@ -39,6 +39,8 @@ public:
 
 enum Network ParseNetwork(const std::string& net);
 std::string GetNetworkName(enum Network net);
+/** Return a vector of publicly routable Network names; optionally append NET_UNROUTABLE. */
+std::vector<std::string> GetNetworkNames(bool append_unroutable = false);
 bool SetProxy(enum Network net, const proxyType &addrProxy);
 bool GetProxy(enum Network net, proxyType &proxyInfoOut);
 bool IsProxy(const CNetAddr &addr);