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POProblem with using Win32 IPHelper API in python
 

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  1. POProblem with using Win32 IPHelper API in python
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    <p>I'm attempting to create python module for getting network parameters. I'm using ctypes and has some problems.</p> <p>Function __getInterfaces_win2k() works with python 2.5 and 2.6, but doesn't work with python 2.7 (Unhandled exception at 0x1e001759 in python.exe: 0xC0000005: Access violation reading location 0x00000010.)</p> <p>Function __getInterfaces_win_after_win2k() doesn't work in any version of python (same error).</p> <p>Sometimes, before the crash program print the necessary information. I've tried compare practically all values with program in C. Everything is normal. Any help much appreciated.</p> <pre><code>''' Get different network parameters (interfaces, routing table, etc) ''' from platform import system from sys import getwindowsversion def getInterfaces(): if system() == 'Windows': winversion = getwindowsversion() #from table on page OSVERSIONINFO Structure for GetVersionEx Function if winversion[0] &gt; 5 or (winversion[0] == 5 and winversion[1] &gt; 0): return __getInterfaces_win_after_win2k() else: return __getInterfaces_win2k() else: pass MAX_ADAPTER_ADDRESS_LENGTH = 8 def __getInterfaces_win_after_win2k(): import ctypes.wintypes class HEADER_STRUCT(ctypes.Structure): _fields_ = [ ("Length", ctypes.c_ulong), ("IfIndex", ctypes.c_ulong)] class HEADER_UNION(ctypes.Union): _fields_ = [ ("Alignment", ctypes.c_ulonglong), ("HEADER_STRUCT", HEADER_STRUCT)] class SOCKADDR(ctypes.Structure): _fields_ = [ ("sa_family", ctypes.c_ushort), ("sa_data", ctypes.c_byte * 14)] PSOCKADDR = ctypes.POINTER(SOCKADDR) class SOCKET_ADDRESS(ctypes.Structure): _fields_ = [ ("pSockaddr", PSOCKADDR), ("iSockaddrLength", ctypes.c_int)] class IP_ADAPTER_UNICAST_ADDRESS(ctypes.Structure): pass PIP_ADAPTER_UNICAST_ADDRESS = ctypes.POINTER(IP_ADAPTER_UNICAST_ADDRESS) IP_ADAPTER_UNICAST_ADDRESS._fields_ = [ ("length", ctypes.c_ulong), ("flags", ctypes.c_ulong), ("next", PIP_ADAPTER_UNICAST_ADDRESS), ("address", SOCKET_ADDRESS), ("prefixOrigin", ctypes.c_int), ("suffixOrigin", ctypes.c_int), ("dadState", ctypes.c_int), ("validLifetime", ctypes.c_ulong), ("preferredLifetime", ctypes.c_ulong), ("leaseLifetime", ctypes.c_ulong), ("onLinkPrefixLength", ctypes.c_byte)] class IP_ADAPTER_ANYCAST_ADDRESS(ctypes.Structure): pass PIP_ADAPTER_ANYCAST_ADDRESS = ctypes.POINTER(IP_ADAPTER_ANYCAST_ADDRESS) IP_ADAPTER_ANYCAST_ADDRESS._fields_ = [ ("alignment", ctypes.c_ulonglong), ("next", PIP_ADAPTER_ANYCAST_ADDRESS), ("address", SOCKET_ADDRESS)] class IP_ADAPTER_MULTICAST_ADDRESS(ctypes.Structure): pass PIP_ADAPTER_MULTICAST_ADDRESS = ctypes.POINTER(IP_ADAPTER_MULTICAST_ADDRESS) IP_ADAPTER_MULTICAST_ADDRESS._fields_ = [ ("alignment", ctypes.c_ulonglong), ("next", PIP_ADAPTER_MULTICAST_ADDRESS), ("address", SOCKET_ADDRESS)] class IP_ADAPTER_DNS_SERVER_ADDRESS(ctypes.Structure): pass PIP_ADAPTER_DNS_SERVER_ADDRESS = ctypes.POINTER(IP_ADAPTER_DNS_SERVER_ADDRESS) IP_ADAPTER_DNS_SERVER_ADDRESS._fields_ = [ ("alignment", ctypes.c_ulonglong), ("next", PIP_ADAPTER_DNS_SERVER_ADDRESS), ("address", SOCKET_ADDRESS)] class IP_ADAPTER_PREFIX(ctypes.Structure): pass PIP_ADAPTER_PREFIX = ctypes.POINTER(IP_ADAPTER_PREFIX) IP_ADAPTER_PREFIX._fields_ = [ ("alignment", ctypes.c_ulonglong), ("next", PIP_ADAPTER_PREFIX), ("address", SOCKET_ADDRESS), ("prefixLength", ctypes.c_ulong)] class IP_ADAPTER_WINS_SERVER_ADDRESS(ctypes.Structure): pass PIP_ADAPTER_WINS_SERVER_ADDRESS = ctypes.POINTER(IP_ADAPTER_WINS_SERVER_ADDRESS) IP_ADAPTER_WINS_SERVER_ADDRESS._fields_ = [ ("alignment", ctypes.c_ulonglong), ("next", PIP_ADAPTER_WINS_SERVER_ADDRESS), ("address", SOCKET_ADDRESS)] class IP_ADAPTER_GATEWAY_ADDRESS(ctypes.Structure): pass PIP_ADAPTER_GATEWAY_ADDRESS = ctypes.POINTER(IP_ADAPTER_GATEWAY_ADDRESS) IP_ADAPTER_GATEWAY_ADDRESS._fields_ = [ ("alignment", ctypes.c_ulonglong), ("next", PIP_ADAPTER_GATEWAY_ADDRESS), ("address", SOCKET_ADDRESS)] #ifdef.h class NET_LUID(ctypes.Structure): _fields_ = [ ("value", ctypes.c_ulonglong)] class GUID(ctypes.Structure): _fields_ = [ ("data1", ctypes.wintypes.DWORD), ("data2", ctypes.wintypes.WORD), ("data3", ctypes.wintypes.WORD), ("data4", ctypes.c_byte * 8)] MAX_DNS_SUFFIX_STRING_LENGTH = 256 class IP_ADAPTER_DNS_SUFFIX(ctypes.Structure): pass PIP_ADAPTER_DNS_SUFFIX = ctypes.POINTER(IP_ADAPTER_DNS_SUFFIX) IP_ADAPTER_DNS_SUFFIX._fields_ = [ ("next", PIP_ADAPTER_DNS_SUFFIX), ("string", ctypes.c_wchar * MAX_DNS_SUFFIX_STRING_LENGTH)] class IP_ADAPTER_ADDRESSES(ctypes.Structure): pass PIP_ADAPTER_ADDRESSES = ctypes.POINTER(IP_ADAPTER_ADDRESSES) MAX_DHCPV6_DUID_LENGTH = 130 #IPTypes.h IP_ADAPTER_ADDRESSES._fields_ = [ ("header", HEADER_UNION), ("next", PIP_ADAPTER_ADDRESSES), ("adapterName", ctypes.c_char_p), ("firstUnicastAddress", PIP_ADAPTER_UNICAST_ADDRESS), ("firstAnycastAddress", PIP_ADAPTER_ANYCAST_ADDRESS), ("firstMulticastAddress", PIP_ADAPTER_MULTICAST_ADDRESS), ("firstDnsServerAddress", PIP_ADAPTER_DNS_SERVER_ADDRESS), ("dnsSuffix", ctypes.c_wchar_p), ("description", ctypes.c_wchar_p), ("friendlyName", ctypes.c_wchar_p), ("physicalAddress", ctypes.c_ubyte * MAX_ADAPTER_ADDRESS_LENGTH), ("physicalAddressLength", ctypes.wintypes.DWORD), ("flags", ctypes.wintypes.DWORD), ("mtu", ctypes.wintypes.DWORD), ("ifType", ctypes.wintypes.DWORD), ("operStatus", ctypes.c_int), ("ipv6IfIndex", ctypes.wintypes.DWORD), ("zoneIndices", ctypes.wintypes.DWORD * 16), ("firstPrefix", PIP_ADAPTER_PREFIX), ("transmitLinkSpeed", ctypes.c_ulonglong), ("receiveLinkSpeed", ctypes.c_ulonglong), ("firstWinsServerAddress", PIP_ADAPTER_WINS_SERVER_ADDRESS), ("firstGatewayAddress", PIP_ADAPTER_GATEWAY_ADDRESS), ("ipv4Metric", ctypes.c_ulong), ("ipv6Metric", ctypes.c_ulong), ("luid", NET_LUID),#ifdef.h ("dhcpv4Server", SOCKET_ADDRESS), ("compartmentId", ctypes.c_uint32),#ifdef.h ("networkGuid", GUID), ("connectionType", ctypes.c_int), ("tunnelType", ctypes.c_int), ("dhcpv6Server", SOCKET_ADDRESS), ("dhcpv6ClientDuid", ctypes.c_byte * MAX_DHCPV6_DUID_LENGTH), ("dhcpv6ClientDuidLength", ctypes.c_ulong), ("dhcpv6Iaid", ctypes.c_ulong)] GetAdaptersAddresses = ctypes.windll.iphlpapi.GetAdaptersAddresses GetAdaptersAddresses.restype = ctypes.c_ulong GetAdaptersAddresses.argtypes = [ ctypes.c_ulong, ctypes.c_ulong, ctypes.c_void_p, PIP_ADAPTER_ADDRESSES, ctypes.POINTER(ctypes.c_ulong)] outBufLen = ctypes.c_ulong(15000) adapters = ctypes.pointer(IP_ADAPTER_ADDRESSES()) ctypes.resize(adapters, outBufLen.value) from socket import AF_INET GAA_FLAG_INCLUDE_PREFIX = ctypes.c_ulong(0x0010) GetAdaptersAddresses(ctypes.c_ulong(AF_INET), GAA_FLAG_INCLUDE_PREFIX, None, adapters, ctypes.byref(outBufLen)) a = adapters[0] ifaces = {} while a: iface = {} iface['desc'] = a.description # iface['mac'] = ':'.join(["%02X" % part for part in a.address]) # # adNode = a.ipAddressList # iface['ip'] = [] # while True: # ipAddr = adNode.ipAddress # if ipAddr: # iface['ip'].append( (ipAddr, adNode.ipMask) ) # if adNode.next: # adNode = adNode.next.contents # else: # break ifaces[a.adapterName] = iface if a.next: a = a.next.contents else: break return ifaces def __getInterfaces_win2k(): import ctypes.wintypes MAX_ADAPTER_NAME_LENGTH = 256 MAX_ADAPTER_DESCRIPTION_LENGTH = 128 class IP_ADDR_STRING(ctypes.Structure): pass LP_IP_ADDR_STRING = ctypes.POINTER(IP_ADDR_STRING) IP_ADDR_STRING._fields_ = [ ("next", LP_IP_ADDR_STRING), ("ipAddress", ctypes.c_char * 16), ("ipMask", ctypes.c_char * 16), ("context", ctypes.wintypes.DWORD)] class IP_ADAPTER_INFO (ctypes.Structure): pass LP_IP_ADAPTER_INFO = ctypes.POINTER(IP_ADAPTER_INFO) IP_ADAPTER_INFO._fields_ = [ ("next", LP_IP_ADAPTER_INFO), ("comboIndex", ctypes.wintypes.DWORD), ("adapterName", ctypes.c_char * (MAX_ADAPTER_NAME_LENGTH + 4)), ("description", ctypes.c_char * (MAX_ADAPTER_DESCRIPTION_LENGTH + 4)), ("addressLength", ctypes.c_uint), ("address", ctypes.c_ubyte * MAX_ADAPTER_ADDRESS_LENGTH), ("index", ctypes.wintypes.DWORD), ("type", ctypes.c_uint), ("dhcpEnabled", ctypes.c_uint), ("currentIpAddress", LP_IP_ADDR_STRING), ("ipAddressList", IP_ADDR_STRING), ("gatewayList", IP_ADDR_STRING), ("dhcpServer", IP_ADDR_STRING), ("haveWins", ctypes.c_uint), ("primaryWinsServer", IP_ADDR_STRING), ("secondaryWinsServer", IP_ADDR_STRING), ("leaseObtained", ctypes.c_ulong), ("leaseExpires", ctypes.c_ulong)] GetAdaptersInfo = ctypes.windll.iphlpapi.GetAdaptersInfo GetAdaptersInfo.restype = ctypes.wintypes.DWORD GetAdaptersInfo.argtypes = [LP_IP_ADAPTER_INFO, ctypes.POINTER(ctypes.c_ulong)] adapters = ctypes.pointer(IP_ADAPTER_INFO()) buflen = ctypes.c_ulong(ctypes.sizeof(IP_ADAPTER_INFO)) GetAdaptersInfo(adapters, ctypes.byref(buflen)) ctypes.resize(adapters, buflen.value) GetAdaptersInfo(adapters, ctypes.byref(buflen)) a = adapters.contents ifaces = {} while a: iface = {} iface['desc'] = a.description iface['mac'] = ':'.join(["%02X" % part for part in a.address]) adNode = a.ipAddressList iface['ip'] = [] while True: ipAddr = adNode.ipAddress if ipAddr: iface['ip'].append( (ipAddr, adNode.ipMask) ) if adNode.next: adNode = adNode.next.contents else: break ifaces[a.adapterName] = iface if a.next: a = a.next.contents else: break return ifaces if __name__ == "__main__": ifaces = getInterfaces() for k, v in ifaces.iteritems(): print k for k2, v2 in v.iteritems(): print '\t', k2, v2 </code></pre>
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