mirror of
https://github.com/openvswitch/ovs
synced 2025-08-29 05:18:13 +00:00
09daa5dfe6
According to Python documentation here for execvp: http://docs.python.org/2/library/os.html "The current process is replaced immediately. Open file objects and descriptors are not flushed, so if there may be data buffered on these open files, you should flush them using sys.stdout.flush() or os.fsync() before calling an exec* function. Without the flush, we will miss the print statements before that if we redirect the o/p to a file. Signed-off-by: Gurucharan Shetty <gshetty@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
103 lines
2.9 KiB
Plaintext
Executable File
103 lines
2.9 KiB
Plaintext
Executable File
#! @PYTHON@
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import os
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import re
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import stat
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import sys
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if "--help" in sys.argv:
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sys.stdout.write("""\
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ovs-check-dead-ifs: Check for packet sockets for nonexistent network devices.
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One side effect of the "force-reload-kmod" command that reloads the
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Open vSwitch kernel module is that all the network devices that the
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Open vSwitch kernel module implemented get destroyed and then replaced
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by new instances with the same names. Unfortunately, programs that
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are listening for packets on the original network devices will not
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receive packets that arrive on the new instances. This causes some
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services, such as DHCP, to silently fail. This program looks for such
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problems and, if it finds any, prints information about programs that
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are in such a state. The system administrator should then take some
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action to fix the problem, such as restarting these programs.
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""")
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sys.exit(0)
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elif len(sys.argv) > 1:
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sys.stderr.write("ovs-check-dead-ifs: no arguments or options accepted "
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"(use --help for help)\n")
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sys.exit(1)
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# Get the set of all valid ifindexes.
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#
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# 0 is always valid for our purposes because it means "any interface".
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valid_ifindexes = set([])
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for ifname in os.listdir("/sys/class/net"):
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fn = "/sys/class/net/%s/ifindex" % ifname
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try:
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valid_ifindexes.add(int(open(fn).readline()))
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except IOError:
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pass
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except ValueError:
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print "%s: unexpected format\n" % fn
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# Get inodes for all packet sockets whose ifindexes don't exist.
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invalid_inodes = set()
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f = open("/proc/net/packet")
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f.readline() # Skip header line.
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for line in f:
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fields = line.split()
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ifindex = int(fields[4])
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if ifindex not in valid_ifindexes:
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invalid_inodes.add(int(fields[8]))
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f.close()
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if not invalid_inodes:
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sys.exit(0)
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# Now find the processes that are using those packet sockets.
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inode_re = re.compile(r'socket:\[([0-9]+)\]$')
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bad_pids = set()
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for pid in os.listdir("/proc"):
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try:
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pid = int(pid)
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except ValueError:
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continue
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try:
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fds = os.listdir("/proc/%d/fd" % pid)
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except OSError:
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continue
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for fd in fds:
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try:
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fd = int(fd)
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except ValueError:
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continue
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try:
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s = os.stat("/proc/%d/fd/%d" % (pid, fd))
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except OSError:
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continue
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if not stat.S_ISSOCK(s.st_mode):
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continue
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try:
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linkname = os.readlink("/proc/%d/fd/%d" % (pid, fd))
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except OSError:
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continue
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m = inode_re.match(linkname)
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if not m:
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continue
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inode = int(m.group(1))
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if inode in invalid_inodes:
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bad_pids.add(pid)
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if bad_pids:
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print """
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The following processes are listening for packets to arrive on network devices
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that no longer exist. You may want to restart them."""
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sys.stdout.flush()
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os.execvp("ps", ["ps"] + ["%s" % pid for pid in bad_pids])
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