add note to services.txt stating the file is auto-generated

Author: GyulyVGC

build.rs

@@ -41,6 +41,10 @@ fn build_services_phf() {
     for line_res in input.lines() {
         // we want to panic if one of the lines is err...
         let line = line_res.unwrap();
+        // skip comment or blank lines
+        if line.trim().is_empty() || line.trim().starts_with('#') {
+            continue;
+        }
         let mut parts = line.split('\t');
         // we want to panic if one of the service names is invalid
         let val = Cow::Owned(get_valid_service_fmt_const(parts.next().unwrap()));

resources/scripts/services.sh

@@ -6,7 +6,9 @@
 
 OUT=./services.txt
 
+echo -e "# This file is automatically generated from the port-to-service mappings provided by nmap\n# Available at: https://raw.githubusercontent.com/nmap/nmap/master/nmap-services\n# Don't edit this file manually\n" > $OUT
+
 curl https://raw.githubusercontent.com/nmap/nmap/master/nmap-services \
   | grep -E '/tcp|/udp' \
   | grep -E -v '^#|^unknown\t' \
-  | cut -d$'\t' -f 1,2 > $OUT
+  | cut -d$'\t' -f 1,2 >> $OUT

services.txt

@@ -1,3 +1,7 @@
+# This file is automatically generated from the port-to-service mappings provided by nmap
+# Available at: https://raw.githubusercontent.com/nmap/nmap/master/nmap-services
+# Don't edit this file manually
+
 tcpmux	1/tcp
 tcpmux	1/udp
 compressnet	2/tcp