public static string ExtractWorkingDirectory(string commandOutput, string packageName)
{
IEnumerable <string> allLines = commandOutput.GetLines();
// Linux will allow just about anything in a directory name as long as it is excaped. Android is much
// more picky about package names. Let's reject characters which are invalid in a package name, highly
// unlikely that any Android distribution would decide to use in the base directory, and likely to show
// up in any debug spew we should ignore.
char[] invalidPackageNameChars = { ' ', '\t', '*', '[', ']', '(', ')', '{', '}', ':' };
// run-as is giving debug spew on a Galaxy S6, so we need to look at all the lines, and find the one that could be the working directory
IEnumerable <string> workingDirectoryLines = allLines.Where(
line => line.Length > 0 &&
line[0] == '/' &&
line.IndexOfAny(invalidPackageNameChars) < 0
);
if (workingDirectoryLines.Count() == 1)
{
return(workingDirectoryLines.Single());
}
RunAsOutputParser.ThrowIfRunAsErrors(commandOutput, packageName);
throw new LauncherException(Telemetry.LaunchFailureCode.BadPwdOutput, string.Format(CultureInfo.CurrentCulture, LauncherResources.Error_ShellCommandBadResults, "pwd"));
}
private string GetGdbServerPath(string workingDirectory, Device device)
{
// On Android, the files of an application are extracted to the system owned directory /data/app/<appname>-<int>/lib
// For 32-bit shared libraries, Android will create a symlink from the app owned directory /data/data/<appname>/lib
// to maintain backwards compatibility with previous API versions.
// There is no such symlink for 64-bit libraries, since Android only supports 64-bit since API 21, at which point
// the app owned directory was no longer used for libs.
// check the legacy location for 32-bit libs
string gdbServerPath = workingDirectory + "/lib/gdbserver";
string lsCommand = string.Format(CultureInfo.InvariantCulture, "ls {0}", gdbServerPath);
string output = ExecCommand(lsCommand);
if (string.Compare(output, gdbServerPath, StringComparison.Ordinal) != 0)
{
// <app data>/lib is not symlinked to system's app data directory (/data/app/<app package>/lib).
// We copy gdbserver ourselves because of 2 reasons:
// 1. the app user doesn't have permissions on /data/app/<app package>-<suffix>/lib (it's owned by system)
// 2. we can't deterministically figure out the location where gdbserver is in /data/app because of the suffix,
// which is used by Android to have multiple copies of the APK extracted in the system.
string tmpGDBServer = string.Format(CultureInfo.InvariantCulture, "/data/local/tmp/gdbserver");
device.FileSystem.Upload(_installPaths.GDBServerPath, tmpGDBServer, true);
// Files can't be executed from /data/local/tmp
string dest = string.Format(CultureInfo.InvariantCulture, "{0}/gdbserver", workingDirectory);
// Can't use cp since shell doesn't have permissions to /data/data/<app>
// and the app uid doesn't have permissions to /data/local/tmp
string copyGDBServerCommand = string.Format(CultureInfo.InvariantCulture,
"cat {0} | run-as {1} /system/bin/sh -c \"cat > {2}\"", tmpGDBServer, _launchOptions.Package, dest);
int rc = ExecCommand(copyGDBServerCommand, out output);
RunAsOutputParser.ThrowIfRunAsErrors(output, _launchOptions.Package);
if (rc != 0)
{
throw new LauncherException(
Telemetry.LaunchFailureCode.NoGdbServer,
string.Format(CultureInfo.InvariantCulture, LauncherResources.Error_ShellCommandFailed, copyGDBServerCommand, output));
}
string chmodGDBServerCommand = string.Format(CultureInfo.InvariantCulture,
"run-as {0} chmod 700 {1}", _launchOptions.Package, dest);
rc = ExecCommand(chmodGDBServerCommand, out output);
RunAsOutputParser.ThrowIfRunAsErrors(output, _launchOptions.Package);
if (rc != 0)
{
throw new LauncherException(
Telemetry.LaunchFailureCode.NoGdbServer,
string.Format(CultureInfo.InvariantCulture, LauncherResources.Error_ShellCommandFailed, chmodGDBServerCommand, output));
}
gdbServerPath = dest;
}
return(gdbServerPath);
}
