Allow connections to port 0. Fixes #1560

nmap · Apr 18, 2019 · 3de7a01 · 3de7a01
1 parent 85ec647
commit 3de7a01
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diff --git a/CHANGELOG b/CHANGELOG
@@ -1,5 +1,8 @@
 #Nmap Changelog ($Id$); -*-text-*-
 
+o [Ncat][GH#1560] Allow Ncat to connect to servers on port 0, provided that the
+  socket implementation allows this. [Daniel Miller]
+
 o Update the included libpcap to 1.9.0. [Daniel Miller]
 
 o [NSE][GH#1544] Fix a logic error that resulted in scripts not honoring the

diff --git a/ncat/ncat_main.c b/ncat/ncat_main.c
@@ -891,7 +891,7 @@ int main(int argc, char *argv[])
 
         errno = 0;
         long_port = strtol(argv[optind], NULL, 10);
-        if (errno != 0 || long_port <= 0 || long_port > 65535)
+        if (errno != 0 || long_port < 0 || long_port > 65535)
             bye("Invalid port number \"%s\".", argv[optind]);
 
         o.portno = (unsigned short) long_port;