Merge #10812: [utils] Allow bitcoin-cli's -rpcconnect option to be used with square brackets

5c643241e [utils] allow square brackets for ipv6 addresses in bitcoin-cli (John Newbery)
fe4fabaf1 [refactor] move SplitHostPort() into utilstrencodings (John Newbery)

Pull request description:

  bitcoin-cli's `-rpcconnect` can accept ipv6 addresses (as long as the libevent version is new enough), but fails to parse ipv6 with square brackets. This PR makes `bitcoin-cli` parse ipv6 in square brackets correctly.

  `bitcoin-cli -rpcconnect=[::1] <command>`

  should now be equivalent to

  `bitcoin-cli -rpcconnect=::1 <command>`

  This is useful so the `bitcoin-cli` option can now be in the same format as the `bitcoind` option.

  Doesn't include tests. I have a branch that fully tests `bitcoin-cli`, but that's queued behind several intermediate PRs.

  - first commit moves `SplitHostPort()` from libbitcoin_common into libbitcoin_util
  - second commit adds proper ipv6 parsing to bitcoin-cli

Tree-SHA512: 249d409f10360c989474283341f458cc97364a56a7d004ae6d5f13d8bffe3a51b5dc2484d42218848e2d42cd9c0b13a1b92e94ea19b209f7e91c875c208d8409

7 files changed, 31 insertions, 22 deletions

diff --git a/src/bitcoin-cli.cpp b/src/bitcoin-cli.cpp
index 885b787b4d..92f6a21ebb 100644
--- a/src/bitcoin-cli.cpp
+++ b/src/bitcoin-cli.cpp
@@ -10,6 +10,7 @@
 #include "chainparamsbase.h"
 #include "clientversion.h"
 #include "fs.h"
+#include "utilstrencodings.h"
 #include "rpc/client.h"
 #include "rpc/protocol.h"
 #include "util.h"
@@ -191,8 +192,14 @@ static void http_error_cb(enum evhttp_request_error err, void *ctx)
 
 UniValue CallRPC(const std::string& strMethod, const UniValue& params)
 {
-    std::string host = GetArg("-rpcconnect", DEFAULT_RPCCONNECT);
-    int port = GetArg("-rpcport", BaseParams().RPCPort());
+    std::string host;
+    // In preference order, we choose the following for the port:
+    //     1. -rpcport
+    //     2. port in -rpcconnect (ie following : in ipv4 or ]: in ipv6)
+    //     3. default port for chain
+    int port = BaseParams().RPCPort();
+    SplitHostPort(GetArg("-rpcconnect", DEFAULT_RPCCONNECT), port, host);
+    port = GetArg("-rpcport", port);
 
     // Obtain event base
     raii_event_base base = obtain_event_base();
diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index 1c53d8d49d..290a2efca2 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -7,6 +7,7 @@
 #include "chainparamsbase.h"
 #include "compat.h"
 #include "util.h"
+#include "utilstrencodings.h"
 #include "netbase.h"
 #include "rpc/protocol.h" // For HTTP status codes
 #include "sync.h"
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 3fb1c18f03..1f668a5d4c 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -58,25 +58,6 @@ std::string GetNetworkName(enum Network net) {
     }
 }
 
-void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
-    size_t colon = in.find_last_of(':');
-    // if a : is found, and it either follows a [...], or no other : is in the string, treat it as port separator
-    bool fHaveColon = colon != in.npos;
-    bool fBracketed = fHaveColon && (in[0]=='[' && in[colon-1]==']'); // if there is a colon, and in[0]=='[', colon is not 0, so in[colon-1] is safe
-    bool fMultiColon = fHaveColon && (in.find_last_of(':',colon-1) != in.npos);
-    if (fHaveColon && (colon==0 || fBracketed || !fMultiColon)) {
-        int32_t n;
-        if (ParseInt32(in.substr(colon + 1), &n) && n > 0 && n < 0x10000) {
-            in = in.substr(0, colon);
-            portOut = n;
-        }
-    }
-    if (in.size()>0 && in[0] == '[' && in[in.size()-1] == ']')
-        hostOut = in.substr(1, in.size()-2);
-    else
-        hostOut = in;
-}
-
 bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
 {
     vIP.clear();
diff --git a/src/netbase.h b/src/netbase.h
index c9d108aadd..fd4b34c8f1 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -39,7 +39,6 @@ public:
 
 enum Network ParseNetwork(std::string net);
 std::string GetNetworkName(enum Network net);
-void SplitHostPort(std::string in, int &portOut, std::string &hostOut);
 bool SetProxy(enum Network net, const proxyType &addrProxy);
 bool GetProxy(enum Network net, proxyType &proxyInfoOut);
 bool IsProxy(const CNetAddr &addr);
diff --git a/src/test/netbase_tests.cpp b/src/test/netbase_tests.cpp
index b45a7fcc57..1baf7643e5 100644
--- a/src/test/netbase_tests.cpp
+++ b/src/test/netbase_tests.cpp
@@ -4,6 +4,7 @@
 
 #include "netbase.h"
 #include "test/test_bitcoin.h"
+#include "utilstrencodings.h"
 
 #include <string>
 
diff --git a/src/utilstrencodings.cpp b/src/utilstrencodings.cpp
index 2fabb8cf7a..9ee14070a2 100644
--- a/src/utilstrencodings.cpp
+++ b/src/utilstrencodings.cpp
@@ -91,6 +91,25 @@ std::vector<unsigned char> ParseHex(const std::string& str)
     return ParseHex(str.c_str());
 }
 
+void SplitHostPort(std::string in, int &portOut, std::string &hostOut) {
+    size_t colon = in.find_last_of(':');
+    // if a : is found, and it either follows a [...], or no other : is in the string, treat it as port separator
+    bool fHaveColon = colon != in.npos;
+    bool fBracketed = fHaveColon && (in[0]=='[' && in[colon-1]==']'); // if there is a colon, and in[0]=='[', colon is not 0, so in[colon-1] is safe
+    bool fMultiColon = fHaveColon && (in.find_last_of(':',colon-1) != in.npos);
+    if (fHaveColon && (colon==0 || fBracketed || !fMultiColon)) {
+        int32_t n;
+        if (ParseInt32(in.substr(colon + 1), &n) && n > 0 && n < 0x10000) {
+            in = in.substr(0, colon);
+            portOut = n;
+        }
+    }
+    if (in.size()>0 && in[0] == '[' && in[in.size()-1] == ']')
+        hostOut = in.substr(1, in.size()-2);
+    else
+        hostOut = in;
+}
+
 std::string EncodeBase64(const unsigned char* pch, size_t len)
 {
     static const char *pbase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
diff --git a/src/utilstrencodings.h b/src/utilstrencodings.h
index 8b37fe12e0..707fdaad16 100644
--- a/src/utilstrencodings.h
+++ b/src/utilstrencodings.h
@@ -48,6 +48,7 @@ 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 SplitHostPort(std::string in, int &portOut, std::string &hostOut);
 std::string i64tostr(int64_t n);
 std::string itostr(int n);
 int64_t atoi64(const char* psz);