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netifaces.c
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netifaces.c
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#include <Python.h>
/* Before Python 2.6, PyUnicode_FromString doesn't exist */
#if PY_MAJOR_VERSION < 2 || (PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 6)
PyObject *PyUnicode_FromString(const char *s)
{
Py_ssize_t len = strlen(s);
if (!len) {
Py_UNICODE uc = 0;
return PyUnicode_FromUnicode(&uc, 0);
}
return PyUnicode_DecodeUTF8(s, len, NULL);
}
#endif
/* Python 3 compatibility */
#if PY_MAJOR_VERSION >= 3
#define PyInt_FromLong PyLong_FromLong
#define MODULE_ERROR NULL
#define MODULE_RETURN(v) return (v)
#define MODULE_INIT(name) PyMODINIT_FUNC PyInit_##name(void)
#define MODULE_DEF(name,doc,methods) \
static struct PyModuleDef moduledef = { \
PyModuleDef_HEAD_INIT, (name), (doc), -1, (methods), };
#define MODULE_CREATE(obj,name,doc,methods) \
obj = PyModule_Create(&moduledef);
#else /* PY_MAJOR_VERSION < 3 */
#define MODULE_ERROR
#define MODULE_RETURN(v)
#define MODULE_INIT(name) void init##name(void)
#define MODULE_DEF(name,doc,methods)
#define MODULE_CREATE(obj,name,doc,methods) \
obj = Py_InitModule3((name), (methods), (doc));
#endif
#ifndef WIN32
# include <sys/types.h>
# include <sys/socket.h>
# include <net/if.h>
# include <netdb.h>
# if HAVE_PF_ROUTE
# include <net/route.h>
# endif
# if HAVE_SYSCTL_CTL_NET
# include <sys/sysctl.h>
# include <net/route.h>
# endif
/* RTNL_FAMILY_MAX not there yet in old kernels, see linux commit 25239ce */
# if HAVE_PF_NETLINK
# include <asm/types.h>
# include <linux/netlink.h>
# include <linux/rtnetlink.h>
# if !defined(RTNL_FAMILY_MAX)
# include <linux/net.h>
# define RTNL_FAMILY_MAX NPROTO
# endif
# include <arpa/inet.h>
# endif
# if HAVE_GETIFADDRS
# if HAVE_IPV6_SOCKET_IOCTLS
# include <sys/ioctl.h>
# include <netinet/in.h>
# include <netinet/in_var.h>
# endif
# endif
# if HAVE_SOCKET_IOCTLS
# include <sys/ioctl.h>
# include <netinet/in.h>
# include <arpa/inet.h>
# if defined(__sun)
# include <unistd.h>
# include <stropts.h>
# include <sys/sockio.h>
# endif
# endif /* HAVE_SOCKET_IOCTLS */
/* For logical interfaces support we convert all names to same name prefixed
with l */
#if HAVE_SIOCGLIFNUM
#define CNAME(x) l##x
#else
#define CNAME(x) x
#endif
#if HAVE_NET_IF_DL_H
# include <net/if_dl.h>
#endif
/* For the benefit of stupid platforms (Linux), include all the sockaddr
definitions we can lay our hands on. It can also be useful for the benefit
of another stupid platform (FreeBSD, see PR 152036). */
#include <netinet/in.h>
# if HAVE_NETASH_ASH_H
# include <netash/ash.h>
# endif
# if HAVE_NETATALK_AT_H
# include <netatalk/at.h>
# endif
# if HAVE_NETAX25_AX25_H
# include <netax25/ax25.h>
# endif
# if HAVE_NETECONET_EC_H
# include <neteconet/ec.h>
# endif
# if HAVE_NETIPX_IPX_H
# include <netipx/ipx.h>
# endif
# if HAVE_NETPACKET_PACKET_H
# include <netpacket/packet.h>
# endif
# if HAVE_NETROSE_ROSE_H
# include <netrose/rose.h>
# endif
# if HAVE_LINUX_IRDA_H
# include <linux/irda.h>
# endif
# if HAVE_LINUX_ATM_H
# include <linux/atm.h>
# endif
# if HAVE_LINUX_LLC_H
# include <linux/llc.h>
# endif
# if HAVE_LINUX_TIPC_H
# include <linux/tipc.h>
# endif
# if HAVE_LINUX_DN_H
# include <linux/dn.h>
# endif
/* Map address families to sizes of sockaddr structs */
static int af_to_len(int af)
{
switch (af) {
case AF_INET: return sizeof (struct sockaddr_in);
#if defined(AF_INET6) && HAVE_SOCKADDR_IN6
case AF_INET6: return sizeof (struct sockaddr_in6);
#endif
#if defined(AF_AX25) && HAVE_SOCKADDR_AX25
# if defined(AF_NETROM)
case AF_NETROM: /* I'm assuming this is carried over x25 */
# endif
case AF_AX25: return sizeof (struct sockaddr_ax25);
#endif
#if defined(AF_IPX) && HAVE_SOCKADDR_IPX
case AF_IPX: return sizeof (struct sockaddr_ipx);
#endif
#if defined(AF_APPLETALK) && HAVE_SOCKADDR_AT
case AF_APPLETALK: return sizeof (struct sockaddr_at);
#endif
#if defined(AF_ATMPVC) && HAVE_SOCKADDR_ATMPVC
case AF_ATMPVC: return sizeof (struct sockaddr_atmpvc);
#endif
#if defined(AF_ATMSVC) && HAVE_SOCKADDR_ATMSVC
case AF_ATMSVC: return sizeof (struct sockaddr_atmsvc);
#endif
#if defined(AF_X25) && HAVE_SOCKADDR_X25
case AF_X25: return sizeof (struct sockaddr_x25);
#endif
#if defined(AF_ROSE) && HAVE_SOCKADDR_ROSE
case AF_ROSE: return sizeof (struct sockaddr_rose);
#endif
#if defined(AF_DECnet) && HAVE_SOCKADDR_DN
case AF_DECnet: return sizeof (struct sockaddr_dn);
#endif
#if defined(AF_PACKET) && HAVE_SOCKADDR_LL
case AF_PACKET: return sizeof (struct sockaddr_ll);
#endif
#if defined(AF_ASH) && HAVE_SOCKADDR_ASH
case AF_ASH: return sizeof (struct sockaddr_ash);
#endif
#if defined(AF_ECONET) && HAVE_SOCKADDR_EC
case AF_ECONET: return sizeof (struct sockaddr_ec);
#endif
#if defined(AF_IRDA) && HAVE_SOCKADDR_IRDA
case AF_IRDA: return sizeof (struct sockaddr_irda);
#endif
#if defined(AF_LINK) && HAVE_SOCKADDR_DL
case AF_LINK: return sizeof (struct sockaddr_dl);
#endif
}
return sizeof (struct sockaddr);
}
#if !HAVE_SOCKADDR_SA_LEN
#define SA_LEN(sa) af_to_len(sa->sa_family)
#if HAVE_SIOCGLIFNUM
#define SS_LEN(sa) af_to_len(sa->ss_family)
#else
#define SS_LEN(sa) SA_LEN(sa)
#endif
#else
#define SA_LEN(sa) sa->sa_len
#endif /* !HAVE_SOCKADDR_SA_LEN */
# if HAVE_GETIFADDRS
# include <ifaddrs.h>
# endif /* HAVE_GETIFADDRS */
# if !HAVE_GETIFADDRS && (!HAVE_SOCKET_IOCTLS || !HAVE_SIOCGIFCONF)
/* If the platform doesn't define, what we need, barf. If you're seeing this,
it means you need to write suitable code to retrieve interface information
on your system. */
# error You need to add code for your platform.
# endif
#else /* defined(WIN32) */
#define _WIN32_WINNT 0x0501
# include <winsock2.h>
# include <ws2tcpip.h>
# include <iphlpapi.h>
# include <netioapi.h>
#endif /* defined(WIN32) */
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
/* On systems without AF_LINK (Windows, for instance), define it anyway, but
give it a crazy value. On Linux, which has AF_PACKET but not AF_LINK,
define AF_LINK as the latter instead. */
#ifndef AF_LINK
# ifdef AF_PACKET
# define AF_LINK AF_PACKET
# else
# define AF_LINK -1000
# endif
# define HAVE_AF_LINK 0
#else
# define HAVE_AF_LINK 1
#endif
/* -- Utility Functions ----------------------------------------------------- */
#if !defined(WIN32)
#if !HAVE_GETNAMEINFO
#undef getnameinfo
#undef NI_NUMERICHOST
#define getnameinfo our_getnameinfo
#define NI_NUMERICHOST 1
/* A very simple getnameinfo() for platforms without */
static int
getnameinfo (const struct sockaddr *addr, int addr_len,
char *buffer, int buflen,
char *buf2, int buf2len,
int flags)
{
switch (addr->sa_family) {
case AF_INET:
{
const struct sockaddr_in *sin = (struct sockaddr_in *)addr;
const unsigned char *bytes = (unsigned char *)&sin->sin_addr.s_addr;
char tmpbuf[20];
sprintf (tmpbuf, "%d.%d.%d.%d",
bytes[0], bytes[1], bytes[2], bytes[3]);
strncpy (buffer, tmpbuf, buflen);
}
break;
#ifdef AF_INET6
case AF_INET6:
{
const struct sockaddr_in6 *sin = (const struct sockaddr_in6 *)addr;
const unsigned char *bytes = sin->sin6_addr.s6_addr;
int n;
char tmpbuf[80], *ptr = tmpbuf;
int done_double_colon = FALSE;
int colon_mode = FALSE;
for (n = 0; n < 8; ++n) {
unsigned char b1 = bytes[2 * n];
unsigned char b2 = bytes[2 * n + 1];
if (b1) {
if (colon_mode) {
colon_mode = FALSE;
*ptr++ = ':';
}
sprintf (ptr, "%x%02x", b1, b2);
ptr += strlen (ptr);
*ptr++ = ':';
} else if (b2) {
if (colon_mode) {
colon_mode = FALSE;
*ptr++ = ':';
}
sprintf (ptr, "%x", b2);
ptr += strlen (ptr);
*ptr++ = ':';
} else {
if (!colon_mode) {
if (done_double_colon) {
*ptr++ = '0';
*ptr++ = ':';
} else {
if (n == 0)
*ptr++ = ':';
colon_mode = TRUE;
done_double_colon = TRUE;
}
}
}
}
if (colon_mode) {
colon_mode = FALSE;
*ptr++ = ':';
*ptr++ = '\0';
} else {
*--ptr = '\0';
}
strncpy (buffer, tmpbuf, buflen);
}
break;
#endif /* AF_INET6 */
default:
return -1;
}
return 0;
}
#endif
static int
string_from_sockaddr (struct sockaddr *addr,
char *buffer,
size_t buflen)
{
struct sockaddr* bigaddr = 0;
int failure;
struct sockaddr* gniaddr;
socklen_t gnilen;
if (!addr || addr->sa_family == AF_UNSPEC)
return -1;
if (SA_LEN(addr) < af_to_len(addr->sa_family)) {
/* Sometimes ifa_netmask can be truncated. So let's detruncate it. FreeBSD
PR: kern/152036: getifaddrs(3) returns truncated sockaddrs for netmasks
-- http://www.freebsd.org/cgi/query-pr.cgi?pr=152036 */
gnilen = af_to_len(addr->sa_family);
bigaddr = calloc(1, gnilen);
if (!bigaddr)
return -1;
memcpy(bigaddr, addr, SA_LEN(addr));
#if HAVE_SOCKADDR_SA_LEN
bigaddr->sa_len = gnilen;
#endif
gniaddr = bigaddr;
} else {
gnilen = SA_LEN(addr);
gniaddr = addr;
}
failure = getnameinfo (gniaddr, gnilen,
buffer, buflen,
NULL, 0,
NI_NUMERICHOST);
if (bigaddr) {
free(bigaddr);
bigaddr = 0;
}
if (failure) {
size_t n, len;
char *ptr;
const char *data;
len = SA_LEN(addr);
#if HAVE_AF_LINK
/* BSD-like systems have AF_LINK */
if (addr->sa_family == AF_LINK) {
struct sockaddr_dl *dladdr = (struct sockaddr_dl *)addr;
len = dladdr->sdl_alen;
data = LLADDR(dladdr);
} else {
#endif
#if defined(AF_PACKET)
/* Linux has AF_PACKET instead */
if (addr->sa_family == AF_PACKET) {
struct sockaddr_ll *lladdr = (struct sockaddr_ll *)addr;
len = lladdr->sll_halen;
data = (const char *)lladdr->sll_addr;
} else {
#endif
/* We don't know anything about this sockaddr, so just display
the entire data area in binary. */
len -= (sizeof (struct sockaddr) - sizeof (addr->sa_data));
data = addr->sa_data;
#if defined(AF_PACKET)
}
#endif
#if HAVE_AF_LINK
}
#endif
if (buflen < 3 * len)
return -1;
ptr = buffer;
buffer[0] = '\0';
for (n = 0; n < len; ++n) {
sprintf (ptr, "%02x:", data[n] & 0xff);
ptr += 3;
}
if (len)
*--ptr = '\0';
}
if (!buffer[0])
return -1;
return 0;
}
/* Tries to format in CIDR form where possible; falls back to using
string_from_sockaddr(). */
static int
string_from_netmask (struct sockaddr *addr,
char *buffer,
size_t buflen)
{
#ifdef AF_INET6
if (addr && addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
unsigned n = 16;
unsigned zeroes = 0;
unsigned prefix;
unsigned bytes;
char *bufptr = buffer;
char *bufend = buffer + buflen;
char pfxbuf[16];
while (n--) {
unsigned char byte = sin6->sin6_addr.s6_addr[n];
/* We need to count the rightmost zeroes */
unsigned char x = byte;
unsigned zx = 8;
x &= -x;
if (x)
--zx;
if (x & 0x0f)
zx -= 4;
if (x & 0x33)
zx -= 2;
if (x & 0x55)
zx -= 1;
zeroes += zx;
if (byte)
break;
}
prefix = 128 - zeroes;
bytes = 2 * ((prefix + 15) / 16);
for (n = 0; n < bytes; ++n) {
unsigned char byte = sin6->sin6_addr.s6_addr[n];
char ch1, ch2;
if (n && !(n & 1)) {
if (bufptr < bufend)
*bufptr++ = ':';
}
ch1 = '0' + (byte >> 4);
if (ch1 > '9')
ch1 += 'a' - '0' - 10;
ch2 = '0' + (byte & 0xf);
if (ch2 > '9')
ch2 += 'a' - '0' - 10;
if (bufptr < bufend)
*bufptr++ = ch1;
if (bufptr < bufend)
*bufptr++ = ch2;
}
if (bytes < 16) {
if (bufend - bufptr > 2) {
*bufptr++ = ':';
*bufptr++ = ':';
}
}
sprintf (pfxbuf, "/%u", prefix);
if (bufend - bufptr > (int)strlen(pfxbuf))
strcpy (bufptr, pfxbuf);
if (buflen)
buffer[buflen - 1] = '\0';
return 0;
}
#endif
return string_from_sockaddr(addr, buffer, buflen);
}
#endif /* !defined(WIN32) */
#if defined(WIN32)
static int
compare_bits (const void *pva,
const void *pvb,
unsigned bits)
{
const unsigned char *pa = (const unsigned char *)pva;
const unsigned char *pb = (const unsigned char *)pvb;
unsigned char a, b;
static unsigned char masks[] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
};
while (bits >= 8) {
a = *pa++;
b = *pb++;
if (a < b)
return -1;
else if (a > b)
return +1;
bits -= 8;
}
if (bits) {
a = *pa++ & masks[bits];
b = *pb++ & masks[bits];
if (a < b)
return -1;
else if (a > b)
return +1;
}
return 0;
}
static PyObject *
netmask_from_prefix (unsigned prefix)
{
char buffer[256];
char *bufptr = buffer;
char *bufend = buffer + sizeof(buffer);
unsigned bytes = 2 * ((prefix + 15) / 16);
static const unsigned char masks[] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
};
unsigned n;
unsigned left = prefix;
char pfxbuf[16];
for (n = 0; n < bytes; ++n) {
unsigned char byte;
char ch1, ch2;
if (left >= 8) {
byte = 0xff;
left -= 8;
} else {
byte = masks[left];
left = 0;
}
if (n && !(n & 1)) {
if (bufptr < bufend)
*bufptr++ = ':';
}
ch1 = '0' + (byte >> 4);
if (ch1 > '9')
ch1 += 'a' - '0' - 10;
ch2 = '0' + (byte & 0xf);
if (ch2 > '9')
ch2 += 'a' - '0' - 10;
if (bufptr < bufend)
*bufptr++ = ch1;
if (bufptr < bufend)
*bufptr++ = ch2;
}
if (bytes < 16) {
if (bufend - bufptr > 2) {
*bufptr++ = ':';
*bufptr++ = ':';
}
}
sprintf (pfxbuf, "/%u", prefix);
if ((size_t)(bufend - bufptr) > strlen(pfxbuf))
strcpy (bufptr, pfxbuf);
buffer[sizeof(buffer) - 1] = '\0';
return PyUnicode_FromString(buffer);
}
/* We dynamically bind to WSAAddressToStringW or WSAAddressToStringA
depending on which is available, as the latter is deprecated and
the former doesn't exist on all Windows versions on which this code
might run. */
typedef INT (WSAAPI *WSAAddressToStringWPtr)(LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFOW, LPWSTR, LPDWORD);
typedef INT (WSAAPI *WSAAddressToStringAPtr)(LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFOA, LPSTR, LPDWORD);
static WSAAddressToStringWPtr
get_address_to_string_w(void) {
static int ptr_is_set;
static WSAAddressToStringWPtr ptr;
if (!ptr_is_set) {
HMODULE hmod = LoadLibrary ("ws2_32.dll");
ptr = (WSAAddressToStringWPtr)GetProcAddress (hmod, "WSAAddressToStringW");
if (!ptr)
FreeLibrary (hmod);
ptr_is_set = 1;
}
return ptr;
}
static WSAAddressToStringAPtr
get_address_to_string_a(void) {
static int ptr_is_set;
static WSAAddressToStringAPtr ptr;
if (!ptr_is_set) {
HMODULE hmod = LoadLibrary ("ws2_32.dll");
ptr = (WSAAddressToStringAPtr)GetProcAddress (hmod, "WSAAddressToStringA");
if (!ptr)
FreeLibrary (hmod);
ptr_is_set = 1;
}
return ptr;
}
static PyObject *
string_from_address(SOCKADDR *addr, DWORD addrlen)
{
WSAAddressToStringWPtr AddressToStringW = get_address_to_string_w();
if (AddressToStringW) {
wchar_t buffer[256];
DWORD dwLen = sizeof(buffer) / sizeof(wchar_t);
INT iRet;
iRet = AddressToStringW (addr, addrlen, NULL, buffer, &dwLen);
if (iRet == 0)
return PyUnicode_FromWideChar (buffer, dwLen - 1);
} else {
char buffer[256];
DWORD dwLen = sizeof(buffer);
WSAAddressToStringAPtr AddressToStringA = get_address_to_string_a();
INT iRet;
iRet = AddressToStringA (addr, addrlen, NULL, buffer, &dwLen);
if (iRet == 0)
return PyUnicode_FromString (buffer);
}
return NULL;
}
#endif
static int
add_to_family (PyObject *result, int family, PyObject *obj)
{
PyObject *py_family;
PyObject *list;
if (!PyObject_Size (obj))
return TRUE;
py_family = PyInt_FromLong (family);
list = PyDict_GetItem (result, py_family);
if (!py_family) {
Py_DECREF (obj);
Py_XDECREF (list);
return FALSE;
}
if (!list) {
list = PyList_New (1);
if (!list) {
Py_DECREF (obj);
Py_DECREF (py_family);
return FALSE;
}
PyList_SET_ITEM (list, 0, obj);
PyDict_SetItem (result, py_family, list);
Py_DECREF (list);
} else {
PyList_Append (list, obj);
Py_DECREF (obj);
}
return TRUE;
}
/* -- ifaddresses() --------------------------------------------------------- */
static PyObject *
ifaddrs (PyObject *self, PyObject *args)
{
const char *ifname;
PyObject *result;
int found = FALSE;
#if defined(WIN32)
PIP_ADAPTER_ADDRESSES pAdapterAddresses = NULL, pInfo = NULL;
ULONG ulBufferLength = 0;
DWORD dwRet;
PIP_ADAPTER_UNICAST_ADDRESS pUniAddr;
#elif HAVE_GETIFADDRS
struct ifaddrs *addrs = NULL;
struct ifaddrs *addr = NULL;
#endif
if (!PyArg_ParseTuple (args, "s", &ifname))
return NULL;
result = PyDict_New ();
if (!result)
return NULL;
#if defined(WIN32)
/* .. Win32 ............................................................... */
/* First, retrieve the adapter information. We do this in a loop, in
case someone adds or removes adapters in the meantime. */
do {
dwRet = GetAdaptersAddresses (AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, NULL,
pAdapterAddresses, &ulBufferLength);
if (dwRet == ERROR_BUFFER_OVERFLOW) {
if (pAdapterAddresses)
free (pAdapterAddresses);
pAdapterAddresses = (PIP_ADAPTER_ADDRESSES)malloc (ulBufferLength);
if (!pAdapterAddresses) {
Py_DECREF (result);
PyErr_SetString (PyExc_MemoryError, "Not enough memory");
return NULL;
}
}
} while (dwRet == ERROR_BUFFER_OVERFLOW);
/* If we failed, then fail in Python too */
if (dwRet != ERROR_SUCCESS && dwRet != ERROR_NO_DATA) {
Py_DECREF (result);
if (pAdapterAddresses)
free (pAdapterAddresses);
PyErr_SetString (PyExc_OSError,
"Unable to obtain adapter information.");
return NULL;
}
for (pInfo = pAdapterAddresses; pInfo; pInfo = pInfo->Next) {
char buffer[256];
if (strcmp (pInfo->AdapterName, ifname) != 0)
continue;
found = TRUE;
/* Do the physical address */
if (256 >= 3 * pInfo->PhysicalAddressLength) {
PyObject *hwaddr, *dict;
char *ptr = buffer;
unsigned n;
*ptr = '\0';
for (n = 0; n < pInfo->PhysicalAddressLength; ++n) {
sprintf (ptr, "%02x:", pInfo->PhysicalAddress[n] & 0xff);
ptr += 3;
}
*--ptr = '\0';
hwaddr = PyUnicode_FromString (buffer);
dict = PyDict_New ();
if (!dict) {
Py_XDECREF (hwaddr);
Py_DECREF (result);
free (pAdapterAddresses);
return NULL;
}
PyDict_SetItemString (dict, "addr", hwaddr);
Py_DECREF (hwaddr);
if (!add_to_family (result, AF_LINK, dict)) {
Py_DECREF (result);
free (pAdapterAddresses);
return NULL;
}
}
for (pUniAddr = pInfo->FirstUnicastAddress;
pUniAddr;
pUniAddr = pUniAddr->Next) {
PyObject *addr;
PyObject *mask = NULL;
PyObject *bcast = NULL;
PIP_ADAPTER_PREFIX pPrefix;
short family = pUniAddr->Address.lpSockaddr->sa_family;
addr = string_from_address (pUniAddr->Address.lpSockaddr,
pUniAddr->Address.iSockaddrLength);
if (!addr)
continue;
/* Find the netmask, where possible */
if (family == AF_INET) {
struct sockaddr_in *pAddr
= (struct sockaddr_in *)pUniAddr->Address.lpSockaddr;
int prefix_len = -1;
struct sockaddr_in maskAddr, bcastAddr;
unsigned toDo;
unsigned wholeBytes, remainingBits;
unsigned char *pMaskBits, *pBcastBits;
PIP_ADAPTER_PREFIX pBest = NULL;
for (pPrefix = pInfo->FirstPrefix;
pPrefix;
pPrefix = pPrefix->Next) {
struct sockaddr_in *pPrefixAddr
= (struct sockaddr_in *)pPrefix->Address.lpSockaddr;
if (pPrefixAddr->sin_family != AF_INET
|| (prefix_len >= 0
&& pPrefix->PrefixLength < (unsigned)prefix_len)
|| (prefix_len >= 0 && pPrefix->PrefixLength == 32))
continue;
if (compare_bits (&pPrefixAddr->sin_addr,
&pAddr->sin_addr,
pPrefix->PrefixLength) == 0) {
prefix_len = pPrefix->PrefixLength;
pBest = pPrefix;
}
}
if (!pBest)
continue;
if (prefix_len < 0)
prefix_len = 32;
memcpy (&maskAddr,
pBest->Address.lpSockaddr,
sizeof (maskAddr));
memcpy (&bcastAddr,
pBest->Address.lpSockaddr,
sizeof (bcastAddr));
wholeBytes = prefix_len >> 3;
remainingBits = prefix_len & 7;
toDo = wholeBytes;
pMaskBits = (unsigned char *)&maskAddr.sin_addr;
while (toDo--)
*pMaskBits++ = 0xff;
toDo = 4 - wholeBytes;
pBcastBits = (unsigned char *)&bcastAddr.sin_addr + wholeBytes;
if (remainingBits) {
static const unsigned char masks[] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
};
*pMaskBits++ = masks[remainingBits];
*pBcastBits &= masks[remainingBits];
*pBcastBits++ |= ~masks[remainingBits];
--toDo;
}
while (toDo--) {
*pMaskBits++ = 0;
*pBcastBits++ = 0xff;
}
mask = string_from_address ((SOCKADDR *)&maskAddr,
sizeof (maskAddr));
bcast = string_from_address ((SOCKADDR *)&bcastAddr,
sizeof (bcastAddr));
} else if (family == AF_INET6) {
struct sockaddr_in6 *pAddr
= (struct sockaddr_in6 *)pUniAddr->Address.lpSockaddr;
int prefix_len = -1;
struct sockaddr_in6 bcastAddr;
unsigned toDo;
unsigned wholeBytes, remainingBits;
unsigned char *pBcastBits;
PIP_ADAPTER_PREFIX pBest = NULL;
for (pPrefix = pInfo->FirstPrefix;
pPrefix;
pPrefix = pPrefix->Next) {
struct sockaddr_in6 *pPrefixAddr
= (struct sockaddr_in6 *)pPrefix->Address.lpSockaddr;
if (pPrefixAddr->sin6_family != AF_INET6
|| (prefix_len >= 0
&& pPrefix->PrefixLength < (unsigned)prefix_len)
|| (prefix_len >= 0 && pPrefix->PrefixLength == 128))
continue;
if (compare_bits (&pPrefixAddr->sin6_addr,
&pAddr->sin6_addr,
pPrefix->PrefixLength) == 0) {
prefix_len = pPrefix->PrefixLength;
pBest = pPrefix;
}
}
if (!pBest)
continue;
if (prefix_len < 0)
prefix_len = 128;
memcpy (&bcastAddr,
pBest->Address.lpSockaddr,
sizeof (bcastAddr));
wholeBytes = prefix_len >> 3;
remainingBits = prefix_len & 7;
toDo = 16 - wholeBytes;
pBcastBits = (unsigned char *)&bcastAddr.sin6_addr + wholeBytes;
if (remainingBits) {
static const unsigned char masks[] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
};
*pBcastBits &= masks[remainingBits];
*pBcastBits++ |= ~masks[remainingBits];
--toDo;
}
while (toDo--)
*pBcastBits++ = 0xff;
mask = netmask_from_prefix (prefix_len);
bcast = string_from_address ((SOCKADDR *)&bcastAddr, sizeof(bcastAddr));
}
{
PyObject *dict;
dict = PyDict_New ();
if (!dict) {
Py_XDECREF (addr);
Py_XDECREF (mask);
Py_XDECREF (bcast);
Py_DECREF (result);
free (pAdapterAddresses);
return NULL;
}
if (addr)
PyDict_SetItemString (dict, "addr", addr);
if (mask)
PyDict_SetItemString (dict, "netmask", mask);
if (bcast)
PyDict_SetItemString (dict, "broadcast", bcast);
Py_XDECREF (addr);