terminator/terminatorlib/freebsd.py

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