From dbb181f466cc92961d016e8645903eeecb7f37b7 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Thu, 27 Jul 2017 15:06:17 +0200
Subject: [PATCH] Drop dependency on zlib.

It's not used, since nothing in the code enables compression. If the
application wants to use compression, it should perform this itself.
---
 configure.ac       |  4 ----
 src/net_packet.c   | 35 ++---------------------------------
 src/protocol_key.c |  3 ++-
 3 files changed, 4 insertions(+), 38 deletions(-)

diff --git a/configure.ac b/configure.ac
index 3a067381..ec530b24 100644
--- a/configure.ac
+++ b/configure.ac
@@ -132,10 +132,6 @@ AC_CHECK_DECLS([freeaddrinfo, gai_strerror, getaddrinfo, getnameinfo],
 
 AC_CACHE_SAVE
 
-dnl These are defined in files in m4/
-
-MeshLink_ZLIB
-
 AC_CONFIG_FILES([Makefile src/Makefile doc/Makefile m4/Makefile test/Makefile examples/Makefile])
 
 AC_OUTPUT
diff --git a/src/net_packet.c b/src/net_packet.c
index 9fabffd7..03ecc945 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -196,42 +196,11 @@ static void mtu_probe_h(meshlink_handle_t *mesh, node_t *n, vpn_packet_t *packet
 }
 
 static uint16_t compress_packet(uint8_t *dest, const uint8_t *source, uint16_t len, int level) {
-	if(level == 0) {
-		memcpy(dest, source, len);
-		return len;
-	} else if(level == 10)
-		return -1;
-	else if(level < 10) {
-#ifdef HAVE_ZLIB
-		unsigned long destlen = MAXSIZE;
-		if(compress2(dest, &destlen, source, len, level) == Z_OK)
-			return destlen;
-		else
-#endif
-			return -1;
-	} else
-		return -1;
-
-	return -1;
+	abort();
 }
 
 static uint16_t uncompress_packet(uint8_t *dest, const uint8_t *source, uint16_t len, int level) {
-	if(level == 0) {
-		memcpy(dest, source, len);
-		return len;
-	} else if(level > 9)
-		return -1;
-#ifdef HAVE_ZLIB
-	else {
-		unsigned long destlen = MAXSIZE;
-		if(uncompress(dest, &destlen, source, len) == Z_OK)
-			return destlen;
-		else
-			return -1;
-	}
-#endif
-
-	return -1;
+	abort();
 }
 
 /* VPN packet I/O */
diff --git a/src/protocol_key.c b/src/protocol_key.c
index ec2cde4a..ccaf9e28 100644
--- a/src/protocol_key.c
+++ b/src/protocol_key.c
@@ -304,7 +304,8 @@ bool ans_key_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
 	/* Don't use key material until every check has passed. */
 	from->status.validkey = false;
 
-	if(compression < 0 || compression > 11) {
+	/* Compression is not supported. */
+	if(compression != 0) {
 		logger(mesh, MESHLINK_ERROR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
 		return true;
 	}
-- 
2.39.2