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* net.cc (get_ifconf): Code cleanup. Split. Call os dependent

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subfunctions instead.
        (get_9x_ifconf): New function for 9X systems, called by get_ifconf.
        (get_nt_ifconf): New function for NT systems, called by get_ifconf.
        (get_2k_ifconf): New function for W2K systems, called by get_ifconf.
This commit is contained in:
Corinna Vinschen 2000-09-28 06:34:38 +00:00
parent a3bb629e96
commit 7326d4e4b1
2 changed files with 435 additions and 303 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,11 @@
Thu Sep 28 01:46:00 2000 Corinna Vinschen <corinna@vinschen.de>
* net.cc (get_ifconf): Code cleanup. Split. Call os dependent
subfunctions instead.
(get_9x_ifconf): New function for 9X systems, called by get_ifconf.
(get_nt_ifconf): New function for NT systems, called by get_ifconf.
(get_2k_ifconf): New function for W2K systems, called by get_ifconf.
Wed Sep 27 01:10:07 2000 Christopher Faylor <cgf@cygnus.com>
* spawn.cc (spawn_guts): Attempt to accomodate archaic windows quoting

730
winsup/cygwin/net.cc
View File

@ -1018,6 +1018,11 @@ getdomainname (char *domain, int len)
/* Cygwin internal */
/* Fill out an ifconf struct.
*
* Windows 2000:
* Look at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\
Parameters\Interfaces
* Each subkey is an interface.
*
* Windows NT:
* Look at the Bind value in
@ -1039,316 +1044,435 @@ getdomainname (char *domain, int len)
* entries from the Registry and use all entries that have legal
* "IPAddress" and "IPMask" values.
*/
static void
get_2k_ifconf (struct ifconf *ifc, struct sockaddr_in *sa, int what)
{
HKEY key;
int cnt = 1;
/* Union maps buffer to correct struct */
struct ifreq *ifr = ifc->ifc_req;
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,
"SYSTEM\\"
"CurrentControlSet\\"
"Services\\"
"Tcpip\\"
"Parameters\\"
"Interfaces",
0, KEY_READ, &key) == ERROR_SUCCESS)
{
HKEY ikey;
unsigned long lip, lnp;
char name[256];
DWORD type, size;
char eth[2] = "/", ppp[2] = "/";
for (int idx = 0;
RegEnumKeyEx (key, idx, name, (size = 256, &size),
NULL, NULL, 0, NULL) == ERROR_SUCCESS;
++idx)
{
if (RegOpenKeyEx (key, name, 0, KEY_READ, &ikey) != ERROR_SUCCESS)
continue;
/* If the "NTEContextList" value not exists, the subkey
is irrelevant. */
if (RegQueryValueEx (ikey, "NTEContextList",
NULL, &type, NULL, &size) != ERROR_SUCCESS)
{
RegCloseKey (ikey);
continue;
}
if ((caddr_t) ++ifr > ifc->ifc_buf
+ ifc->ifc_len
- sizeof (struct ifreq))
{
RegCloseKey (ikey);
break;
}
char ipaddress[256], netmask[256];
char dhcpaddress[256], dhcpnetmask[256];
if (RegQueryValueEx (ikey, "IPAddress",
NULL, &type,
(unsigned char *) ipaddress,
(size = 256, &size)) == ERROR_SUCCESS
&& RegQueryValueEx (ikey, "SubnetMask",
NULL, &type,
(unsigned char *) netmask,
(size = 256, &size)) == ERROR_SUCCESS)
{
/* ppp interfaces don't have the "AddressType" value. */
if (RegQueryValueEx (ikey, "AddressType",
NULL, &type, NULL, &size) == ERROR_SUCCESS)
{
++*eth;
strcpy (ifr->ifr_name, "eth");
strcat (ifr->ifr_name, eth);
}
else
{
++*ppp;
strcpy (ifr->ifr_name, "ppp");
strcat (ifr->ifr_name, ppp);
}
memset (&ifr->ifr_addr, '\0', sizeof ifr->ifr_addr);
if (cygwin_inet_addr (ipaddress) == 0L
&& RegQueryValueEx (ikey, "DhcpIPAddress",
NULL, &type,
(unsigned char *) dhcpaddress,
(size = 256, &size))
== ERROR_SUCCESS
&& RegQueryValueEx (ikey, "DhcpSubnetMask",
NULL, &type,
(unsigned char *) dhcpnetmask,
(size = 256, &size))
== ERROR_SUCCESS)
{
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = cygwin_inet_addr (dhcpaddress);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (dhcpaddress);
lnp = cygwin_inet_addr (dhcpnetmask);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr =
cygwin_inet_addr (dhcpnetmask);
break;
}
}
else
{
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = cygwin_inet_addr (ipaddress);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (ipaddress);
lnp = cygwin_inet_addr (netmask);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr (netmask);
break;
}
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
++cnt;
}
RegCloseKey (ikey);
}
RegCloseKey (key);
}
/* Set the correct length */
ifc->ifc_len = cnt * sizeof (struct ifreq);
}
static void
get_nt_ifconf (struct ifconf *ifc, struct sockaddr_in *sa, int what)
{
HKEY key;
unsigned long lip, lnp;
DWORD type, size;
int cnt = 1;
char *binding = (char *) 0;
/* Union maps buffer to correct struct */
struct ifreq *ifr = ifc->ifc_req;
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,
"SYSTEM\\"
"CurrentControlSet\\"
"Services\\"
"Tcpip\\"
"Linkage",
0, KEY_READ, &key) == ERROR_SUCCESS)
{
if (RegQueryValueEx (key, "Bind",
NULL, &type,
NULL, &size) == ERROR_SUCCESS)
{
binding = (char *) alloca (size);
if (RegQueryValueEx (key, "Bind",
NULL, &type,
(unsigned char *) binding,
&size) != ERROR_SUCCESS)
{
binding = NULL;
}
}
RegCloseKey (key);
}
if (binding)
{
char *bp, eth[2] = "/";
char cardkey[256], ipaddress[256], netmask[256];
for (bp = binding; *bp; bp += strlen(bp) + 1)
{
bp += strlen ("\\Device\\");
strcpy (cardkey, "SYSTEM\\CurrentControlSet\\Services\\");
strcat (cardkey, bp);
strcat (cardkey, "\\Parameters\\Tcpip");
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, cardkey,
0, KEY_READ, &key) != ERROR_SUCCESS)
continue;
if (RegQueryValueEx (key, "IPAddress",
NULL, &type,
(unsigned char *) ipaddress,
(size = 256, &size)) == ERROR_SUCCESS
&& RegQueryValueEx (key, "SubnetMask",
NULL, &type,
(unsigned char *) netmask,
(size = 256, &size)) == ERROR_SUCCESS)
{
char *ip, *np;
char dhcpaddress[256], dhcpnetmask[256];
for (ip = ipaddress, np = netmask;
*ip && *np;
ip += strlen (ip) + 1, np += strlen (np) + 1)
{
if ((caddr_t) ++ifr > ifc->ifc_buf
+ ifc->ifc_len
- sizeof (struct ifreq))
break;
if (! strncmp (bp, "NdisWan", 7))
{
strcpy (ifr->ifr_name, "ppp");
strcat (ifr->ifr_name, bp + 7);
}
else
{
++*eth;
strcpy (ifr->ifr_name, "eth");
strcat (ifr->ifr_name, eth);
}
memset (&ifr->ifr_addr, '\0', sizeof ifr->ifr_addr);
if (cygwin_inet_addr (ip) == 0L
&& RegQueryValueEx (key, "DhcpIPAddress",
NULL, &type,
(unsigned char *) dhcpaddress,
(size = 256, &size))
== ERROR_SUCCESS
&& RegQueryValueEx (key, "DhcpSubnetMask",
NULL, &type,
(unsigned char *) dhcpnetmask,
(size = 256, &size))
== ERROR_SUCCESS)
{
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = cygwin_inet_addr (dhcpaddress);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (dhcpaddress);
lnp = cygwin_inet_addr (dhcpnetmask);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr =
cygwin_inet_addr (dhcpnetmask);
break;
}
}
else
{
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = cygwin_inet_addr (ip);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (ip);
lnp = cygwin_inet_addr (np);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr (np);
break;
}
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
++cnt;
}
}
RegCloseKey (key);
}
}
/* Set the correct length */
ifc->ifc_len = cnt * sizeof (struct ifreq);
}
static void
get_9x_ifconf (struct ifconf *ifc, struct sockaddr_in *sa, int what)
{
HKEY key, subkey;
unsigned long lip, lnp;
FILETIME update;
LONG res;
DWORD type, size;
char ifname[256], ip[256], np[256];
int cnt = 1;
char eth[2];
eth[0] = '/';
eth[1] = '\0';
/* Union maps buffer to correct struct */
struct ifreq *ifr = ifc->ifc_req;
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,
"SYSTEM\\"
"CurrentControlSet\\"
"Services\\"
"Class\\"
"NetTrans",
0, KEY_READ, &key) == ERROR_SUCCESS)
{
for (int i = 0;
(res = RegEnumKeyEx (key, i, ifname,
(size = sizeof ifname, &size),
0, 0, 0, &update)) != ERROR_NO_MORE_ITEMS;
++i)
{
if (res != ERROR_SUCCESS
|| RegOpenKeyEx (key, ifname, 0,
KEY_READ, &subkey) != ERROR_SUCCESS)
continue;
if (RegQueryValueEx (subkey, "IPAddress", 0,
&type, (unsigned char *) ip,
(size = sizeof ip, &size)) == ERROR_SUCCESS
|| RegQueryValueEx (subkey, "IPMask", 0,
&type, (unsigned char *) np,
(size = sizeof np, &size)) == ERROR_SUCCESS)
{
if ((caddr_t)++ifr > ifc->ifc_buf
+ ifc->ifc_len
- sizeof(struct ifreq))
break;
++*eth;
strcpy (ifr->ifr_name, "eth");
strcat (ifr->ifr_name, eth);
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = cygwin_inet_addr (ip);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (ip);
lnp = cygwin_inet_addr (np);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr (np);
break;
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
++cnt;
}
RegCloseKey (subkey);
}
}
/* Set the correct length */
ifc->ifc_len = cnt * sizeof (struct ifreq);
}
static int
get_ifconf (struct ifconf *ifc, int what)
{
if (os_being_run == winNT)
unsigned long lip, lnp;
struct sockaddr_in *sa;
/* Union maps buffer to correct struct */
struct ifreq *ifr = ifc->ifc_req;
/* Ensure we have space for two struct ifreqs, fail if not. */
if (ifc->ifc_len < (int) (2 * sizeof (struct ifreq)))
{
HKEY key;
DWORD type, size;
unsigned long lip, lnp;
int cnt = 1;
char *binding = (char *) 0;
struct sockaddr_in *sa;
/* Union maps buffer to correct struct */
struct ifreq *ifr = ifc->ifc_req;
/* Ensure we have space for two struct ifreqs, fail if not. */
if (ifc->ifc_len < (int) (2 * sizeof (struct ifreq)))
{
set_errno (EFAULT);
return -1;
}
/* Set up interface lo0 first */
strcpy (ifr->ifr_name, "lo0");
memset (&ifr->ifr_addr, '\0', sizeof (ifr->ifr_addr));
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = htonl (INADDR_LOOPBACK);
break;
case SIOCGIFBRDADDR:
lip = htonl (INADDR_LOOPBACK);
lnp = cygwin_inet_addr ("255.0.0.0");
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr ("255.0.0.0");
break;
default:
set_errno (EINVAL);
return -1;
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,
"SYSTEM\\"
"CurrentControlSet\\"
"Services\\"
"Tcpip\\"
"Linkage",
0, KEY_READ, &key) == ERROR_SUCCESS)
{
if (RegQueryValueEx (key, "Bind",
NULL, &type,
NULL, &size) == ERROR_SUCCESS)
{
binding = (char *) alloca (size);
if (RegQueryValueEx (key, "Bind",
NULL, &type,
(unsigned char *) binding,
&size) != ERROR_SUCCESS)
{
binding = NULL;
}
}
RegCloseKey (key);
}
if (binding)
{
char *bp, eth[2];
char cardkey[256], ipaddress[256], netmask[256];
eth[0] = '/';
eth[1] = '\0';
for (bp = binding; *bp; bp += strlen(bp) + 1)
{
bp += strlen ("\\Device\\");
strcpy (cardkey, "SYSTEM\\CurrentControlSet\\Services\\");
strcat (cardkey, bp);
strcat (cardkey, "\\Parameters\\Tcpip");
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, cardkey,
0, KEY_READ, &key) != ERROR_SUCCESS)
continue;
if (RegQueryValueEx (key, "IPAddress",
NULL, &type,
(unsigned char *) &ipaddress,
(size = 256, &size)) == ERROR_SUCCESS
&& RegQueryValueEx (key, "SubnetMask",
NULL, &type,
(unsigned char *) &netmask,
(size = 256, &size)) == ERROR_SUCCESS)
{
char *ip, *np;
char sub[2];
char dhcpaddress[256], dhcpnetmask[256];
sub[0] = '/';
sub[1] = '\0';
if (strncmp (bp, "NdisWan", 7))
++*eth;
for (ip = ipaddress, np = netmask;
*ip && *np;
ip += strlen (ip) + 1, np += strlen (np) + 1)
{
if ((caddr_t) ++ifr > ifc->ifc_buf
+ ifc->ifc_len
- sizeof (struct ifreq))
break;
if (! strncmp (bp, "NdisWan", 7))
{
strcpy (ifr->ifr_name, "ppp");
strcat (ifr->ifr_name, bp + 7);
}
else
{
strcpy (ifr->ifr_name, "eth");
strcat (ifr->ifr_name, eth);
}
++*sub;
if (*sub >= '1')
strcat (ifr->ifr_name, sub);
memset (&ifr->ifr_addr, '\0', sizeof ifr->ifr_addr);
if (cygwin_inet_addr (ip) == 0L
&& RegQueryValueEx (key, "DhcpIPAddress",
NULL, &type,
(unsigned char *) &dhcpaddress,
(size = 256, &size))
== ERROR_SUCCESS
&& RegQueryValueEx (key, "DhcpSubnetMask",
NULL, &type,
(unsigned char *) &dhcpnetmask,
(size = 256, &size))
== ERROR_SUCCESS)
{
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr =
cygwin_inet_addr (dhcpaddress);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (dhcpaddress);
lnp = cygwin_inet_addr (dhcpnetmask);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr =
cygwin_inet_addr (dhcpnetmask);
break;
}
}
else
{
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = cygwin_inet_addr (ip);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (ip);
lnp = cygwin_inet_addr (np);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr (np);
break;
}
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
++cnt;
}
}
RegCloseKey (key);
}
}
/* Set the correct length */
ifc->ifc_len = cnt * sizeof (struct ifreq);
set_errno (EFAULT);
return -1;
}
else /* Windows 9x */
/* Set up interface lo0 first */
strcpy (ifr->ifr_name, "lo0");
memset (&ifr->ifr_addr, '\0', sizeof (ifr->ifr_addr));
switch (what)
{
HKEY key, subkey;
FILETIME update;
LONG res;
DWORD type, size;
unsigned long lip, lnp;
char ifname[256], ip[256], np[256];
int cnt = 1;
struct sockaddr_in *sa;
/* Union maps buffer to correct struct */
struct ifreq *ifr = ifc->ifc_req;
char eth[2];
eth[0] = '/';
eth[1] = '\0';
/* Ensure we have space for two struct ifreqs, fail if not. */
if (ifc->ifc_len < (int) (2 * sizeof (struct ifreq)))
{
set_errno (EFAULT);
return -1;
}
/* Set up interface lo0 first */
strcpy (ifr->ifr_name, "lo0");
memset (&ifr->ifr_addr, '\0', sizeof ifr->ifr_addr);
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = htonl (INADDR_LOOPBACK);
break;
case SIOCGIFBRDADDR:
lip = htonl(INADDR_LOOPBACK);
lnp = cygwin_inet_addr ("255.0.0.0");
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr ("255.0.0.0");
break;
default:
set_errno (EINVAL);
return -1;
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,
"SYSTEM\\"
"CurrentControlSet\\"
"Services\\"
"Class\\"
"NetTrans",
0, KEY_READ, &key) == ERROR_SUCCESS)
{
for (int i = 0;
(res = RegEnumKeyEx (key, i, ifname,
(size = sizeof ifname, &size),
0, 0, 0, &update)) != ERROR_NO_MORE_ITEMS;
++i)
{
if (res != ERROR_SUCCESS
|| RegOpenKeyEx (key, ifname, 0,
KEY_READ, &subkey) != ERROR_SUCCESS)
continue;
if (RegQueryValueEx (subkey, "IPAddress", 0,
&type, (unsigned char *) ip,
(size = sizeof ip, &size)) == ERROR_SUCCESS
|| RegQueryValueEx (subkey, "IPMask", 0,
&type, (unsigned char *) np,
(size = sizeof np, &size)) == ERROR_SUCCESS)
{
if ((caddr_t)++ifr > ifc->ifc_buf
+ ifc->ifc_len
- sizeof(struct ifreq))
break;
++*eth;
strcpy (ifr->ifr_name, "eth");
strcat (ifr->ifr_name, eth);
switch (what)
{
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = cygwin_inet_addr (ip);
break;
case SIOCGIFBRDADDR:
lip = cygwin_inet_addr (ip);
lnp = cygwin_inet_addr (np);
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr (np);
break;
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
++cnt;
}
RegCloseKey (subkey);
}
}
/* Set the correct length */
ifc->ifc_len = cnt * sizeof (struct ifreq);
case SIOCGIFCONF:
case SIOCGIFADDR:
sa = (struct sockaddr_in *) &ifr->ifr_addr;
sa->sin_addr.s_addr = htonl (INADDR_LOOPBACK);
break;
case SIOCGIFBRDADDR:
lip = htonl (INADDR_LOOPBACK);
lnp = cygwin_inet_addr ("255.0.0.0");
sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
sa->sin_addr.s_addr = lip & lnp | ~lnp;
break;
case SIOCGIFNETMASK:
sa = (struct sockaddr_in *) &ifr->ifr_netmask;
sa->sin_addr.s_addr = cygwin_inet_addr ("255.0.0.0");
break;
default:
set_errno (EINVAL);
return -1;
}
sa->sin_family = AF_INET;
sa->sin_port = 0;
OSVERSIONINFO os_version_info;
memset (&os_version_info, 0, sizeof os_version_info);
os_version_info.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
GetVersionEx (&os_version_info);
if (os_version_info.dwPlatformId != VER_PLATFORM_WIN32_NT)
get_9x_ifconf (ifc, sa, what);
else if (os_version_info.dwMajorVersion <= 4)
get_nt_ifconf (ifc, sa, what);
else
get_2k_ifconf (ifc, sa, what);
return 0;
}