Commit 79dae65b authored by Nirbheek Chauhan's avatar Nirbheek Chauhan

interfaces: Fix fetching of interfaces on Win32

nice_interfaces_get_local_interfaces() was returning the hardware
device names of interfaces that have been seen in the past or could be
connected. It had no relation to the actual interfaces present on the
device. Perhaps this worked back in the XP days, but it is returning
garbage today.

Use GetAdapterAddresses(), and return the adapter friendly names as
the interface names. At the same time, update
nice_interfaces_get_ip_for_interface() to match.

Coincidentally, this also fixes UWP compatibility since GetIfTable and
GetIpAddrTable are not available when targeting UWP. They are only
available for desktop apps:

https://docs.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getiftable
https://docs.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getipaddrtable
parent 5b29ca21
...@@ -497,39 +497,13 @@ nice_interfaces_get_ip_for_interface (gchar *interface_name) ...@@ -497,39 +497,13 @@ nice_interfaces_get_ip_for_interface (gchar *interface_name)
#define MIB_IPADDR_DELETED 0x0040 #define MIB_IPADDR_DELETED 0x0040
#endif #endif
GList * nice_interfaces_get_local_interfaces (void) static IP_ADAPTER_ADDRESSES *
_nice_get_adapters_addresses (void)
{ {
ULONG size = 0; IP_ADAPTER_ADDRESSES *addresses = NULL;
PMIB_IFTABLE if_table;
GList * ret = NULL;
GetIfTable(NULL, &size, TRUE);
if (!size)
return NULL;
if_table = (PMIB_IFTABLE)g_malloc0(size);
if (GetIfTable(if_table, &size, TRUE) == ERROR_SUCCESS) {
DWORD i;
for (i = 0; i < if_table->dwNumEntries; i++) {
ret = g_list_prepend (ret, g_strdup ((gchar*)if_table->table[i].bDescr));
}
}
g_free(if_table);
return ret;
}
GList * nice_interfaces_get_local_ips (gboolean include_loopback)
{
IP_ADAPTER_ADDRESSES *addresses = NULL, *a;
ULONG status; ULONG status;
guint iterations; guint iterations;
ULONG addresses_size; ULONG addresses_size;
DWORD pref = 0;
GList *ret = NULL;
/* As suggested on /* As suggested on
* http://msdn.microsoft.com/en-gb/library/windows/desktop/aa365915%28v=vs.85%29.aspx */ * http://msdn.microsoft.com/en-gb/library/windows/desktop/aa365915%28v=vs.85%29.aspx */
...@@ -555,11 +529,45 @@ GList * nice_interfaces_get_local_ips (gboolean include_loopback) ...@@ -555,11 +529,45 @@ GList * nice_interfaces_get_local_ips (gboolean include_loopback)
/* Error? */ /* Error? */
if (status != NO_ERROR) { if (status != NO_ERROR) {
nice_debug ("Error retrieving local addresses (error code %lu).", status); gchar *msg = g_win32_error_message (status);
nice_debug ("Error retrieving local addresses: %s", msg);
g_free (msg);
g_free (addresses); g_free (addresses);
return NULL; return NULL;
} }
return addresses;
}
GList * nice_interfaces_get_local_interfaces (void)
{
IP_ADAPTER_ADDRESSES *addresses, *a;
GList *ret = NULL;
addresses = _nice_get_adapters_addresses ();
if (!addresses)
return NULL;
for (a = addresses; a != NULL; a = a->Next) {
gchar *name = g_utf16_to_utf8 (a->FriendlyName, -1, NULL, NULL, NULL);
ret = g_list_append (ret, name);
}
g_free(addresses);
return ret;
}
GList * nice_interfaces_get_local_ips (gboolean include_loopback)
{
IP_ADAPTER_ADDRESSES *addresses, *a;
DWORD pref = 0;
GList *ret = NULL;
addresses = _nice_get_adapters_addresses ();
if (!addresses)
return NULL;
/* /*
* Get the best interface for transport to 0.0.0.0. * Get the best interface for transport to 0.0.0.0.
* This interface should be first in list! * This interface should be first in list!
...@@ -613,7 +621,7 @@ GList * nice_interfaces_get_local_ips (gboolean include_loopback) ...@@ -613,7 +621,7 @@ GList * nice_interfaces_get_local_ips (gboolean include_loopback)
continue; continue;
} }
nice_debug ("IP address: %s", addr_string); nice_debug ("Adapter %S IP address: %s", a->FriendlyName, addr_string);
if (a->IfIndex == pref || a->Ipv6IfIndex == pref) if (a->IfIndex == pref || a->Ipv6IfIndex == pref)
ret = g_list_prepend (ret, addr_string); ret = g_list_prepend (ret, addr_string);
...@@ -627,79 +635,67 @@ GList * nice_interfaces_get_local_ips (gboolean include_loopback) ...@@ -627,79 +635,67 @@ GList * nice_interfaces_get_local_ips (gboolean include_loopback)
return ret; return ret;
} }
/* gchar * nice_interfaces_get_ip_for_interface (gchar *interface_name)
* returns ip address as an utf8 string
*/
// Source for idx's type (Was IF_INDEX):
// http://msdn.microsoft.com/en-us/library/aa366836(v=VS.85).aspx
// (Title: MIB_IFROW structure)
static gchar *
win32_get_ip_for_interface (DWORD idx)
{ {
ULONG size = 0; IP_ADAPTER_ADDRESSES *addresses, *a;
PMIB_IPADDRTABLE ip_table; IP_ADAPTER_UNICAST_ADDRESS *unicast;
DWORD status;
gchar * ret = NULL; gchar * ret = NULL;
GetIpAddrTable (NULL, &size, TRUE); addresses = _nice_get_adapters_addresses ();
if (!addresses)
if (!size)
return NULL; return NULL;
ip_table = (PMIB_IPADDRTABLE)g_malloc0 (size); for (a = addresses; a != NULL; a = a->Next) {
IP_ADAPTER_UNICAST_ADDRESS *unicast;
if (GetIpAddrTable (ip_table, &size, TRUE) == ERROR_SUCCESS) { gchar *name;
DWORD i;
for (i = 0; i < ip_table->dwNumEntries; i++) {
PMIB_IPADDRROW ipaddr = &ip_table->table[i];
if (ipaddr->dwIndex == idx &&
!(ipaddr->wType & (MIB_IPADDR_DISCONNECTED | MIB_IPADDR_DELETED))) {
ret = g_strdup_printf ("%lu.%lu.%lu.%lu",
(ipaddr->dwAddr ) & 0xFF,
(ipaddr->dwAddr >> 8) & 0xFF,
(ipaddr->dwAddr >> 16) & 0xFF,
(ipaddr->dwAddr >> 24) & 0xFF);
break;
}
}
}
g_free (ip_table);
return ret;
}
gchar * nice_interfaces_get_ip_for_interface (gchar *interface_name) /* Various conditions for ignoring the interface. */
{ if (a->OperStatus == IfOperStatusDown ||
ULONG size = 0; a->OperStatus == IfOperStatusNotPresent ||
PMIB_IFTABLE if_table; a->OperStatus == IfOperStatusLowerLayerDown) {
gchar * ret = NULL; nice_debug ("Rejecting interface '%S' because it is down or not present",
a->FriendlyName);
continue;
}
GetIfTable (NULL, &size, TRUE); name = g_utf16_to_utf8 (a->FriendlyName, -1, NULL, NULL, NULL);
status = g_strcmp0 (interface_name, name);
g_free (name);
if (!size) /* Found the adapter */
return NULL; if (status == 0)
break;
if_table = (PMIB_IFTABLE)g_malloc0 (size); nice_debug ("Rejecting interface '%s' != '%s'", name, interface_name);
}
if (GetIfTable (if_table, &size, TRUE) == ERROR_SUCCESS) { if (!a) {
DWORD i; nice_debug ("No matches found for interface %s", interface_name);
gchar * tmp_str; goto out;
for (i = 0; i < if_table->dwNumEntries; i++) { }
tmp_str = g_utf16_to_utf8 (
if_table->table[i].wszName, MAX_INTERFACE_NAME_LEN,
NULL, NULL, NULL);
if (strlen (interface_name) == strlen (tmp_str) && /* Grab the interface’s ipv4 unicast addresses. */
g_ascii_strncasecmp (interface_name, tmp_str, strlen (interface_name)) == 0) { for (unicast = a->FirstUnicastAddress;
ret = win32_get_ip_for_interface (if_table->table[i].dwIndex); unicast != NULL; unicast = unicast->Next) {
g_free (tmp_str); if (unicast->Address.lpSockaddr->sa_family != AF_INET) {
break; nice_debug ("Rejecting ipv6 address on interface %S", a->FriendlyName);
} continue;
}
g_free (tmp_str); ret = sockaddr_to_string (unicast->Address.lpSockaddr);
if (ret == NULL) {
nice_debug ("Failed to convert address to string for interface: %S",
a->FriendlyName);
continue;
} }
nice_debug ("Adapter %S IP address: %s", a->FriendlyName, ret);
break;
} }
g_free (if_table); out:
g_free (addresses);
return ret; return ret;
} }
......
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