5359edc160de518d8e43fdd3448365c15b912c3c
galt
  Mon Jul 22 11:48:10 2019 -0700
Added ipv6 support. Listening processes us hybrid dual stack feature of OS to simplify implementation and use a single listening socket. Works with both TCP and UDP. Parasol working. geoIp also updated and ready for IPv6. Should be invisible to most users, while providing connections via ipv6 where available. Supports both ipv4 and ipv6.

diff --git src/hg/lib/geoMirror.c src/hg/lib/geoMirror.c
index bd3c360..e33c58b 100644
--- src/hg/lib/geoMirror.c
+++ src/hg/lib/geoMirror.c
@@ -32,36 +32,40 @@
 
 
 boolean geoMirrorEnabled()
 {
 // return TRUE if this site has geographic mirroring turned on
 return geoMirrorNode() != NULL;
 }
 
 char *geoMirrorNode()
 {
 // return which geo mirror node this is (or NULL if geo mirroring is turned off)
 return cfgOption("browser.node");
 }
 
 
-int defaultNode(struct sqlConnection *centralConn, char *ipStr)
+int geoMirrorDefaultNode4(struct sqlConnection *centralConn, char *ipStr)
 // return default node for given IP
 {
 char query[1024];
 bits32 ip = 0;
 int defaultNode = 1;
+
+if (isIpv6Address(ipStr))  // ipv6 which we do not handle yet. TODO
+    return defaultNode;  // at least tolerate IPV6 remote addr
+
 internetDottedQuadToIp(ipStr, &ip);
 
 char *geoSuffix = cfgOptionDefault("browser.geoSuffix","");
 
 // We (sort-of) assume no overlaps in geoIpNode table, so we can use limit 1 to make query very efficient;
 // we do accomodate a range that is completely contained in another (to accomodate the hgroaming entry for testing);
 // this is accomplished by "<= ipEnd" in the sql query. 
 // TODO The hgroaming thing is probably obsolete and testing is done with browser.geoSuffix= instead.
 // If so, we may wish to remove the loop below since that was added by Larry and reformulate
 // it as it was originally done by Galt.  However it does not seem to affect performance so we can leave it for now.
 
 sqlSafef(query, sizeof query, 
     "select ipStart, ipEnd, node from geoIpNode%s where %u >= ipStart and %u <= ipEnd order by ipStart desc limit 1"
     , geoSuffix, ip, ip);
 char **row;
@@ -69,30 +73,110 @@
 
 if ((row = sqlNextRow(sr)) != NULL)
     {
     uint ipStart = sqlUnsigned(row[0]);
     uint ipEnd = sqlUnsigned(row[1]);
     if (ipStart <= ip && ipEnd >= ip)
         {
         defaultNode = sqlSigned(row[2]);
         }
     }
 sqlFreeResult(&sr);
 
 return defaultNode;
 }
  
+int geoMirrorDefaultNode6(struct sqlConnection *centralConn, char *ipStr)
+// return default node for given IP
+{
+char query[1024];
+char newIpStr[NI_MAXHOST];
+struct in6_addr ip;
+ZeroVar(&ip);
+char ipHex[33];
+
+int defaultNode = 1;
+
+if (isIpv6Address(ipStr))
+    safef(newIpStr, sizeof newIpStr, "%s", ipStr);
+else if (isIpv4Address(ipStr))
+    safef(newIpStr, sizeof newIpStr, "%s%s", IPV4MAPPED_PREFIX, ipStr); // "::ffff:"
+else 
+    {
+    warn("Unexpected strange ip address string: %s", ipStr);
+    return defaultNode;
+    }
+
+if (!internetIpStringToIp6(newIpStr, &ip))
+    errAbort("internetIpStringToIp6 failed for %s", ipStr);
+
+ip6AddrToHexStr(&ip, ipHex, sizeof ipHex);
+
+char *geoSuffix = cfgOptionDefault("browser.geoSuffix","");
+
+// We (sort-of) assume no overlaps in geoIpNode table, so we can use limit 1 to make query very efficient;
+// we do accomodate a range that is completely contained in another (to accomodate the hgroaming entry for testing);
+// this is accomplished by "<= ipEnd" in the sql query. 
+// TODO The hgroaming thing is probably obsolete and testing is done with browser.geoSuffix= instead.
+// If so, we may wish to remove the loop below since that was added by Larry and reformulate
+// it as it was originally done by Galt.  However it does not seem to affect performance so we can leave it for now.
+
+sqlSafef(query, sizeof query, 
+    "select ipStart, ipEnd, node from geoIpNode6%s where unhex('%s') >= ipStart and unhex('%s') <= ipEnd order by ipStart desc limit 1"
+    , geoSuffix, ipHex, ipHex);
+char **row;
+struct sqlResult *sr = sqlGetResult(centralConn, query);
+
+if ((row = sqlNextRow(sr)) != NULL)
+    {
+    struct in6_addr ipStart;
+    ip6AddrCopy((struct in6_addr *)row[0], &ipStart);
+
+    struct in6_addr ipEnd;
+    ip6AddrCopy((struct in6_addr *)row[1], &ipEnd  );
+
+    if (
+	(ip6AddrCmpBits(&ipStart, &ip) <= 0)
+	&&
+	(ip6AddrCmpBits(&ipEnd  , &ip) >= 0)
+       )
+        {
+        defaultNode = sqlSigned(row[2]);
+        }
+    }
+sqlFreeResult(&sr);
+
+return defaultNode;
+}
+
+int geoMirrorDefaultNode(struct sqlConnection *centralConn, char *ipStr)
+// return default node for given IP
+{
+char *geoSuffix = cfgOptionDefault("browser.geoSuffix","");
+char fullTableName[1024];
+safef(fullTableName, sizeof fullTableName, "%s%s", "geoIpNode6", geoSuffix);
+int defaultNode = 1;
+if (sqlTableExists(centralConn, fullTableName))
+    {
+    defaultNode = geoMirrorDefaultNode6(centralConn, ipStr);
+    }
+else
+    {
+    defaultNode = geoMirrorDefaultNode4(centralConn, ipStr);
+    }
+return defaultNode;
+}
 
 char *geoMirrorMenu()
 /* Create customized geoMirror menu string for substitution of  into 
  * <!-- OPTIONAL_MIRROR_MENU --> in htdocs/inc/globalNavBar.inc 
  * Reads hgcentral geo tables and hg.conf settings. 
  * Free the returned string when done. */
 {
 struct dyString *dy = dyStringNew(0);  // by default replacment is just an empty string.
 if (geoMirrorEnabled())
     {
     dyStringAppend(dy, "<li id=\"geoMirrorMenu\" class=\"noHighlight\"><hr></li>\n");
     // Geo mirror functionality (e.g. in nav bar)
     char *myNode = geoMirrorNode();
     /* hgcentral.gbNode table so UI can share w/ browser GEO mirror redirect code */
     char **row = NULL;