diff options
author | Yawning Angel <yawning@torproject.org> | 2015-03-26 06:30:50 +0000 |
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committer | Yawning Angel <yawning@torproject.org> | 2015-03-26 06:30:50 +0000 |
commit | 4e4c9052f436b86729b853715086e9445c76e185 (patch) | |
tree | e78b7a024d9222a79f4d96ad9cd3b26e4d6d7bee /obfs4proxy/parentMonitor_linux.go | |
parent | aed4b723891db1be34eb866a03c62806b58ac148 (diff) |
Attempt to detect if the parent crashed without killing obfs4proxy.
The ideal solution here would be to implement #15435, but till then
use one of several kludges:
* Linux - prctl() so that the kernel SIGTERMs on parent exit.
* Other U*ix - Poll the parent process id once a second, and SIGTERM
ourself/exit if it changes. Former is better since all the normal
cleanup if any gets done.
* Windows - Log a warning.
Diffstat (limited to 'obfs4proxy/parentMonitor_linux.go')
-rw-r--r-- | obfs4proxy/parentMonitor_linux.go | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/obfs4proxy/parentMonitor_linux.go b/obfs4proxy/parentMonitor_linux.go new file mode 100644 index 0000000..0fc967f --- /dev/null +++ b/obfs4proxy/parentMonitor_linux.go @@ -0,0 +1,50 @@ +/* + * Copyright (c) 2015, Yawning Angel <yawning at torproject dot org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +package main + +import ( + "fmt" + "syscall" +) + +func parentMonitorInitLinux() error { + /* Use prctl() to have the kernel deliver a SIGTERM if the parent + * process dies. This beats anything else that can be done before + * #15435 is implemented. + */ + _, _, errno := syscall.Syscall(syscall.SYS_PRCTL, syscall.PR_SET_PDEATHSIG, uintptr(syscall.SIGTERM), 0) + if errno != 0 { + var err error = errno + return fmt.Errorf("prctl(PR_SET_PDEATHSIG, SIGTERM) returned: %s", err) + } + return nil +} + +func init() { + parentMonitorOSInit = parentMonitorInitLinux +} |