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Captive portal: better detect empty responses

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am: cb4aa4d412

Change-Id: I64a006f6bb83dc588b108395d54189bb401c83ff
This commit is contained in:
Hugo Benichi
2017-01-12 08:59:27 +00:00
committed by android-build-merger
parent 50b0979972 cb4aa4d412
commit 3d5357ba2d
1 changed files with 20 additions and 13 deletions
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33
services/core/java/com/android/server/connectivity/NetworkMonitor.java
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@@ -809,19 +809,26 @@ public class NetworkMonitor extends StateMachine {
// portal. If it is considered a captive portal, a different sign-in URL
// is needed (i.e. can't browse a 204). This could be the result of an HTTP
// proxy server.
// Consider 200 response with "Content-length=0" to not be a captive portal.
// There's no point in considering this a captive portal as the user cannot
// sign-in to an empty page. Probably the result of a broken transparent proxy.
// See http://b/9972012.
if (httpResponseCode == 200 && urlConnection.getContentLength() == 0) {
validationLog("Empty 200 response interpreted as 204 response.");
httpResponseCode = 204;
}
if (httpResponseCode == 200 && probeType == ValidationProbeEvent.PROBE_PAC) {
validationLog("PAC fetch 200 response interpreted as 204 response.");
httpResponseCode = 204;
if (httpResponseCode == 200) {
if (probeType == ValidationProbeEvent.PROBE_PAC) {
validationLog("PAC fetch 200 response interpreted as 204 response.");
httpResponseCode = 204;
} else if (urlConnection.getContentLengthLong() == 0) {
// Consider 200 response with "Content-length=0" to not be a captive portal.
// There's no point in considering this a captive portal as the user cannot
// sign-in to an empty page. Probably the result of a broken transparent proxy.
// See http://b/9972012.
validationLog(
"200 response with Content-length=0 interpreted as 204 response.");
httpResponseCode = 204;
} else if (urlConnection.getContentLengthLong() == -1) {
// When no Content-length (default value == -1), attempt to read a byte from the
// response. Do not use available() as it is unreliable. See http://b/33498325.
if (urlConnection.getInputStream().read() == -1) {
validationLog("Empty 200 response interpreted as 204 response.");
httpResponseCode = 204;
}
}
}
} catch (IOException e) {
validationLog("Probably not a portal: exception " + e);