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[#4936] NetUtil can prevent using Netty due to SecurityManager denial

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Motivation:

A custom SecurityManager may prevent calling File.exists() and so throw a SecurityException in the static init block of NetUtil.

Modifications:

Correctly catch the exception and so allow to static init NetUtil.

Result:

Allow static init method of NetUtil to work even with custom SecurityManager.
This commit is contained in:
Norman Maurer 2016-03-10 14:08:45 +01:00
parent 47b598e6ce
commit 559e77c12a
1 changed files with 18 additions and 15 deletions
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15
common/src/main/java/io/netty/util/NetUtil.java
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@ -244,14 +244,22 @@ public final class NetUtil {
// - Linux and Mac OS X: 128
int somaxconn = PlatformDependent.isWindows() ? 200 : 128;
File file = new File("/proc/sys/net/core/somaxconn");
if (file.exists()) {
BufferedReader in = null;
try {
// file.exists() may throw a SecurityException if a SecurityManager is used, so execute it in the
// try / catch block.
// See https://github.com/netty/netty/issues/4936
if (file.exists()) {
in = new BufferedReader(new FileReader(file));
somaxconn = Integer.parseInt(in.readLine());
if (logger.isDebugEnabled()) {
logger.debug("{}: {}", file, somaxconn);
}
} else {
if (logger.isDebugEnabled()) {
logger.debug("{}: {} (non-existent)", file, somaxconn);
}
}
} catch (Exception e) {
logger.debug("Failed to get SOMAXCONN from: {}", file, e);
} finally {
@ -263,11 +271,6 @@ public final class NetUtil {
}
}
}
} else {
if (logger.isDebugEnabled()) {
logger.debug("{}: {} (non-existent)", file, somaxconn);
}
}
return somaxconn;
}
});