Set TCP_NODELAY on the socket

Nagle's algorithm probably serves no purpose with whois queries
often being tiny.

CHANGES

@@ -1,3 +1,6 @@
+1.14
+    - Set TCP_NODELAY on the whois socket
+
 1.13 (2024-05-01)
     - Fixed a bug for Mac users by removing sx_maxsockbuf()
 

Makefile.am

@@ -36,8 +36,8 @@ maintainer-clean-local:
 check:
 	./bgpq4 -v
 	@echo
-	-@if [ -s /etc/resolv.conf ]; then \
-		./bgpq4 -6 AS15562:AS-SNIJDERS | grep 2001:67c:208c::; \
+	-if [ -s /etc/resolv.conf ]; then \
+		./bgpq4 -ddd -6 AS15562:AS-SNIJDERS ; \
 	else \
 		echo "No or empty /etc/resolv.conf, skipping online test"; \
 	fi

expander.c

@@ -29,6 +29,7 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/select.h>
+#include <netinet/tcp.h>
 
 #include <assert.h>
 #include <ctype.h>
@@ -1034,7 +1035,7 @@ bgpq_expand(struct bgpq_expander *b)
 	struct addrinfo 	 hints, *res = NULL, *rp;
 	struct linger		 sl;
 	struct asn_entry	*asne;
-	int			 fd = -1, err, ret, aquery = 0;
+	int			 fd = -1, err, ret, aquery = 0, nodelay = 1;
 	int			 slen;
 
 	sl.l_onoff = 1;
@@ -1075,6 +1076,11 @@ bgpq_expand(struct bgpq_expander *b)
 			continue;
 		}
 
+		if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &nodelay,
+		    sizeof(nodelay)) == -1)
+			SX_DEBUG(debug_expander, "Unable to set TCP_NODELAY on"
+			    " socket: %s\n", strerror(errno));
+
 		break;
 	}