83 lines
2.5 KiB
Python
83 lines
2.5 KiB
Python
#!/usr/local/bin/python
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#
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# Use sysctl() to retrieve the cwd of an arbitrary process on FreeBSD.
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# Tested on FreeBSD 7-STABLE/amd64 from April 11 2008.
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#
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# Be prepared for excitement if the structs are changed.
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#
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# Blame: Thomas Hurst <tom@hur.st>
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#
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from ctypes import *
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# This is padded awkwardly, see /usr/include/sys/socket.h
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class sockaddr_storage(Structure):
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_fields_ = [
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('ss_len', c_char),
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('ss_family', c_char), # /usr/include/sys/_types.h; _uint8_t
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('__ss_pad1', c_char * 6), # (sizeof(int64) - sizeof(char) - sizeof(ss_family_t))
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('__ss_align', c_longlong),
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('__ss_pad2', c_char * 112), # (128(maxsize) - sizeof(char) - sizeof(ss_family_t) -
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# sizeof(ss_pad1) - sizeof(int64))
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]
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# struct kinfo_file, defined in /usr/include/sys/user.h
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class kinfo_file(Structure):
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_fields_ = [
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('kf_structsize', c_int),
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('kf_type', c_int),
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('kf_fd', c_int),
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('kf_ref_count', c_int),
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('kf_flags', c_int),
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('kf_offset', c_long), # this is a off_t, a pointer
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('kf_vnode_type', c_int),
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('kf_sock_domain', c_int),
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('kf_sock_type', c_int),
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('kf_sock_protocol', c_int),
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('kf_path', c_char * 1024), # PATH_MAX
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('kf_sa_local', sockaddr_storage),
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('kf_sa_peer', sockaddr_storage),
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]
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libc = CDLL('libc.so')
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len = c_uint(sizeof(c_uint))
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ver = c_uint(0)
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if (libc.sysctlbyname('kern.osreldate', byref(ver), byref(len), None, 0) < 0):
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raise OSError, "sysctlbyname returned < 0"
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# kern.proc.filedesc added for procstat(1) after these __FreeBSD_versions
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if ver.value < 700104 and ver.value < 800019:
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raise NotImplementedError, "cwd detection requires a recent 7.0-STABLE or 8-CURRENT"
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def get_process_cwd(pid):
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# /usr/include/sys/sysctl.h
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# CTL_KERN, KERN_PROC, KERN_PROC_FILEDESC
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oid = (c_uint * 4)(1, 14, 14, pid)
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if libc.sysctl(oid, 4, None, byref(len), None, 0) < 0:
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return None
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buf = c_char_p(" " * len.value)
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if libc.sysctl(oid, 4, buf, byref(len), None, 0) < 0:
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return None
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kifs = cast(buf, POINTER(kinfo_file))
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for i in range(0, len.value / sizeof(kinfo_file)):
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kif = kifs[i]
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if kif.kf_fd == -1: # KF_FD_TYPE_CWD
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return kif.kf_path
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if __name__ == '__main__':
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import os, sys
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print " => %d cwd = %s" % (os.getpid(), get_process_cwd(os.getpid()))
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for pid in sys.argv:
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try:
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pid = int(pid)
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except:
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pass
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else:
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print " => %d cwd = %s" % (pid, get_process_cwd(pid))
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