Support UDS path for prefetch and esi plugin (#12156)

* Prefetch plugin support UDS path

* support uds in esi

---------

Co-authored-by: Serris Lew <lserris@apple.com>

Author: serrislew

plugins/esi/fetcher/HttpDataFetcherImpl.cc

@@ -65,6 +65,8 @@ HttpDataFetcherImpl::HttpDataFetcherImpl(TSCont contp, sockaddr const *client_ad
       memcpy(&_client_addr, client_addr, sizeof(sockaddr_in));
     } else if (client_addr->sa_family == AF_INET6) {
       memcpy(&_client_addr, client_addr, sizeof(sockaddr_in6));
+    } else if (client_addr->sa_family == AF_UNIX) {
+      memcpy(&_client_addr, client_addr, sizeof(sockaddr_un));
     } else {
       memcpy(&_client_addr, &sin, sizeof(sin));
       TSError("[HttpDataFetcherImpl] Unknown address family %d", client_addr->sa_family);

plugins/esi/fetcher/HttpDataFetcherImpl.h

@@ -27,6 +27,7 @@
 #include <list>
 #include <vector>
 #include <netinet/in.h>
+#include <sys/un.h>
 
 #include "ts/ts.h"
 #include "StringHash.h"

plugins/prefetch/fetch.cc

@@ -27,11 +27,13 @@
 #include <netinet/ip.h>
 #include <cstring>
 #include <sys/socket.h>
+#include <sys/un.h>
 #include <cinttypes>
 
 #include "ts/ts.h" /* ATS API */
 #include "fetch.h"
 #include "headers.h"
+#include "tscore/ink_inet.h"
 
 namespace
 {
@@ -437,6 +439,8 @@ BgFetch::saveIp(TSHttpTxn txnp)
       memcpy(&client_ip, ip, sizeof(sockaddr_in));
     } else if (ip->sa_family == AF_INET6) {
       memcpy(&client_ip, ip, sizeof(sockaddr_in6));
+    } else if (ip->sa_family == AF_UNIX) {
+      memcpy(&client_ip, ip, sizeof(sockaddr_un));
     } else {
       PrefetchError("unknown address family %d", ip->sa_family);
     }
@@ -685,6 +689,11 @@ BgFetch::handler(TSCont contp, TSEvent event, void * /* edata ATS_UNUSED */)
         inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)sockaddress)->sin6_addr), buf, INET6_ADDRSTRLEN);
         PrefetchDebug("client IPv6 = %s", buf);
         break;
+      case AF_UNIX:
+        char path[TS_UNIX_SIZE];
+        strncpy(path, ats_unix_cast(sockaddress)->sun_path, TS_UNIX_SIZE);
+        PrefetchDebug("client UDS = %s", path);
+        break;
       default:
         TSError("[%s] Unknown address family %d", PLUGIN_NAME, sockaddress->sa_family);
         break;