Support key word 'all' in host column of pg_hba.conf

doc/src/sgml/client-auth.sgml

@@ -257,7 +257,7 @@ hostnossl  <replaceable>database</replaceable>  <replaceable>user</replaceable>
       </para>
 
       <para>
-       You can also write
+       You can also write <literal>all</literal> to match any IP address,
        <literal>samehost</literal> to match any of the server's own IP
        addresses, or <literal>samenet</literal> to match any address in any
        subnet that the server is directly connected to.

src/backend/libpq/hba.c

@@ -885,8 +885,11 @@ parse_hba_line(List *line, int line_num, HbaLine *parsedline)
 		}
 		token = lfirst(line_item);
 
-		/* Is it equal to 'samehost' or 'samenet'? */
-		if (strcmp(token, "samehost\n") == 0)
+		if (strcmp(token, "all\n") == 0)
+		{
+			parsedline->ip_cmp_method = ipCmpAll;
+		}
+		else if (strcmp(token, "samehost\n") == 0)
 		{
 			/* Any IP on this host is allowed to connect */
 			parsedline->ip_cmp_method = ipCmpSameHost;
@@ -1503,6 +1506,8 @@ check_hba(hbaPort *port)
 							continue;
 					}
 					break;
+				case ipCmpAll:
+					break;
 				case ipCmpSameHost:
 				case ipCmpSameNet:
 					if (!check_same_host_or_net(&port->raddr,

src/include/libpq/hba.h

@@ -36,7 +36,8 @@ typedef enum IPCompareMethod
 {
 	ipCmpMask,
 	ipCmpSameHost,
-	ipCmpSameNet
+	ipCmpSameNet,
+	ipCmpAll
 } IPCompareMethod;
 
 typedef enum ConnType