commit cbeee4cad1530fa7693c512ac1498f8fc76535a1
from: Omar Polo <op@omarpolo.com>
date: Thu Jan 28 16:27:40 2021 UTC

warn about punycode in server definition

commit - 9a672b37122cd24931aee82617b30200637b287c
commit + cbeee4cad1530fa7693c512ac1498f8fc76535a1
blob - 7929e5317f47d66c1de000faec574415f84bcaf5
blob + d64263737b0bc4264a5c370eca18c7b99918fbc0
--- parse.y
+++ parse.y
@@ -86,6 +86,12 @@ vhost		: TSERVER TSTRING '{' servopts locations '}' {
 			host->locations[0].match = (char*)"*";
 			host->domain = $2;
 
+			if (strstr($2, "xn--") != NULL) {
+				warnx("%s:%d \"%s\" looks like punycode: "
+				    "you should use the decoded hostname."
+				    config_path, yylineno);
+			}
+
 			if (host->cert == NULL || host->key == NULL ||
 			    host->dir == NULL)
 				errx(1, "invalid vhost definition: %s", $2);