fix: dependence on hard-coded url

Makefile

@@ -1,6 +1,7 @@
 default: debug
 
 debug:
-	bash -x wifi4eu.login
+# return true to not see Makefile errors
+	sh -x wifi4eu.login || true
 deploy:
 	scp *.login router:/etc/travelmate

wifi4eu.login

@@ -1,18 +1,22 @@
 #!/bin/sh
 # auto-login for https://wifi4eu.ec.europa.eu or general fortigate
 trm_fetch="$(command -v curl)"
-trm_domain="http://10.0.1.1:1000"
+trm_captiveurl="$(uci_get travelmate global trm_captiveurl "http://detectportal.firefox.com")"
 
-# initial request to get magic id
+# initial request to get login url
-magic="$($trm_fetch -Ls -o /dev/null -w '%{urle.query}' $trm_domain)"
+trm_url="$($trm_fetch -Ls -o /dev/null -w '%{url_effective}' $trm_captiveurl)"
+# extract magic id into $2
+IFS="?"
+set -- $trm_url
 
 # log in
-$trm_fetch $trm_domain \
+$trm_fetch "$1?$2" \
   -X POST \
   -L \
-  -H "Referer: $trm_domain/fgtauth?$magic" \
+  -w '%{http_code}' \
+  -H "Referer: $1?$2" \
   --data "4Tredir=https://krksistemi.hr/rijeka2/" \
-  --data "magic=$magic" \
+  --data "magic=$2" \
   --data "username=Disclaimer+user" \
   --data "password=123"
-[ "${?}" = "0" ] && exit 0 || exit 255
+[ "${?}" = "0" ] && exit 0 || exit 255