Fix ppa log field (#12863)

- Copy a whole pp_info for logging
- Calculate the length with alignment in consideration
- Put null terminator at the end of the log field value

(cherry picked from commit 24e0170)

Author: maskit

src/proxy/http/HttpTransact.cc

@@ -5744,11 +5744,7 @@ HttpTransact::initialize_state_variables_from_request(State *s, HTTPHdr *obsolet
   memset(&s->request_data.dest_ip, 0, sizeof(s->request_data.dest_ip));
   if (vc) {
     s->request_data.incoming_port = vc->get_local_port();
-    s->pp_info.version            = vc->get_proxy_protocol_version();
-    if (s->pp_info.version != ProxyProtocolVersion::UNDEFINED) {
-      ats_ip_copy(s->pp_info.src_addr, vc->get_proxy_protocol_src_addr());
-      ats_ip_copy(s->pp_info.dst_addr, vc->get_proxy_protocol_dst_addr());
-    }
+    s->pp_info                    = vc->get_proxy_protocol_info();
   }
   s->request_data.xact_start                      = s->client_request_time;
   s->request_data.api_info                        = &s->api_info;

src/proxy/logging/LogAccess.cc

@@ -1609,14 +1609,18 @@ LogAccess::marshal_proxy_protocol_dst_ip(char *buf)
 int
 LogAccess::marshal_proxy_protocol_authority(char *buf)
 {
-  if (buf && m_http_sm) {
+  int len = INK_MIN_ALIGN;
+
+  if (m_http_sm) {
     if (auto authority = m_http_sm->t_state.pp_info.get_tlv(PP2_TYPE_AUTHORITY)) {
-      int len = static_cast<int>(authority->size());
-      marshal_str(buf, authority->data(), len);
-      return len;
+      len = padded_length(authority->size() + 1);
+      if (buf) {
+        marshal_str(buf, authority->data(), len);
+        buf[authority->size()] = '\0';
+      }
     }
   }
-  return 0;
+  return len;
 }
 
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