2 files changed, 25 insertions, 11 deletions

diff --git a/app/src/main/java/org/pacien/tincapp/data/CidrAddress.kt b/app/src/main/java/org/pacien/tincapp/data/CidrAddress.kt
index 510ebc9..5d966c4 100644
--- a/app/src/main/java/org/pacien/tincapp/data/CidrAddress.kt
+++ b/app/src/main/java/org/pacien/tincapp/data/CidrAddress.kt
@@ -17,4 +17,5 @@ data class CidrAddress(val address: String, val prefix: Int) {
   }
 
   fun toSlashSeparated() = address + SEPARATOR + prefix
+  override fun toString(): String = "$address/$prefix"
 }
diff --git a/app/src/main/java/org/pacien/tincapp/extensions/VpnServiceBuilder.kt b/app/src/main/java/org/pacien/tincapp/extensions/VpnServiceBuilder.kt
index 53a0f7a..f11115e 100644
--- a/app/src/main/java/org/pacien/tincapp/extensions/VpnServiceBuilder.kt
+++ b/app/src/main/java/org/pacien/tincapp/extensions/VpnServiceBuilder.kt
@@ -9,30 +9,43 @@ import org.pacien.tincapp.extensions.Java.applyIgnoringException
  * @author pacien
  */
 object VpnServiceBuilder {
-  fun VpnService.Builder.addAddress(cidr: CidrAddress): VpnService.Builder = addAddress(cidr.address, cidr.prefix)
-  fun VpnService.Builder.addRoute(cidr: CidrAddress): VpnService.Builder = addRoute(cidr.address, cidr.prefix)
-  fun VpnService.Builder.allowBypass(allow: Boolean): VpnService.Builder = if (allow) allowBypass() else this
-  fun VpnService.Builder.overrideMtu(mtu: Int?): VpnService.Builder = if (mtu != null) setMtu(mtu) else this
+  private fun <T> exceptWithCidr(cidr: CidrAddress, func: () -> T) = try {
+    func()
+  } catch (e: IllegalArgumentException) {
+    throw IllegalArgumentException("${e.message}: $cidr")
+  }
 
-  fun VpnService.Builder.addAddresses(cidrList: List<CidrAddress>): VpnService.Builder =
+  private fun VpnService.Builder.addAddress(cidr: CidrAddress): VpnService.Builder =
+    exceptWithCidr(cidr, { addAddress(cidr.address, cidr.prefix) })
+
+  private fun VpnService.Builder.addRoute(cidr: CidrAddress): VpnService.Builder =
+    exceptWithCidr(cidr, { addRoute(cidr.address, cidr.prefix) })
+
+  private fun VpnService.Builder.allowBypass(allow: Boolean): VpnService.Builder =
+    if (allow) allowBypass() else this
+
+  private fun VpnService.Builder.overrideMtu(mtu: Int?): VpnService.Builder =
+    if (mtu != null) setMtu(mtu) else this
+
+  private fun VpnService.Builder.addAddresses(cidrList: List<CidrAddress>): VpnService.Builder =
     cidrList.fold(this, { net, cidr -> net.addAddress(cidr) })
 
-  fun VpnService.Builder.addRoutes(cidrList: List<CidrAddress>): VpnService.Builder =
+  private fun VpnService.Builder.addRoutes(cidrList: List<CidrAddress>): VpnService.Builder =
     cidrList.fold(this, { net, cidr -> net.addRoute(cidr) })
 
-  fun VpnService.Builder.addDnsServers(dnsList: List<String>): VpnService.Builder =
+  private fun VpnService.Builder.addDnsServers(dnsList: List<String>): VpnService.Builder =
     dnsList.fold(this, { net, dns -> net.addDnsServer(dns) })
 
-  fun VpnService.Builder.addSearchDomains(domainList: List<String>): VpnService.Builder =
+  private fun VpnService.Builder.addSearchDomains(domainList: List<String>): VpnService.Builder =
     domainList.fold(this, { net, domain -> net.addSearchDomain(domain) })
 
-  fun VpnService.Builder.allowFamilies(familyList: List<Int>): VpnService.Builder =
+  private fun VpnService.Builder.allowFamilies(familyList: List<Int>): VpnService.Builder =
     familyList.fold(this, { net, family -> net.allowFamily(family) })
 
-  fun VpnService.Builder.addAllowedApplications(apps: List<String>): VpnService.Builder =
+  private fun VpnService.Builder.addAllowedApplications(apps: List<String>): VpnService.Builder =
     apps.fold(this, { net, app -> applyIgnoringException(net::addAllowedApplication, app, net)!! })
 
-  fun VpnService.Builder.addDisallowedApplications(apps: List<String>): VpnService.Builder =
+  private fun VpnService.Builder.addDisallowedApplications(apps: List<String>): VpnService.Builder =
     apps.fold(this, { net, app -> applyIgnoringException(net::addDisallowedApplication, app, net)!! })
 
   fun VpnService.Builder.applyCfg(cfg: VpnInterfaceConfiguration): VpnService.Builder = this