From: Lev Stipakov <l...@openvpn.net> At the moment if --name is not specified, adapter names are generated by Windows and they look a bit confusing like "Local Area Connection 2".
This is also behavior of "Add a new <driver-name> virtual network adapter" shortcuts. This makes tapctl generate driver-specific names for adapters if --name is missing, inclusing resolving duplicates. For instance following commands: tapctl.exe create --hwid ovpn-dco will create an adapter named OpenVPN Data Channel Offload If the name is taken, the next one will be OpenVPN Data Channel Offload #1 and so on up to 100. Fixes https://github.com/OpenVPN/openvpn/issues/337 Change-Id: Ic5afb470d14ac7b231d91f0f5de0a0046043a7e0 Signed-off-by: Lev Stipakov <l...@openvpn.net> --- src/tapctl/main.c | 133 +++++++++++++++++++++++++++++++++++++--------- 1 file changed, 107 insertions(+), 26 deletions(-) diff --git a/src/tapctl/main.c b/src/tapctl/main.c index 1194036f..e4d44794 100644 --- a/src/tapctl/main.c +++ b/src/tapctl/main.c @@ -126,6 +126,90 @@ usage(void) title_string); } +/** + * Checks if adapter with given name doesn't already exist + */ +BOOL +is_adapter_name_available(LPCTSTR name, struct tap_adapter_node *adapter_list, BOOL log) +{ + for (struct tap_adapter_node *a = adapter_list; a; a = a->pNext) + { + if (_tcsicmp(name, a->szName) == 0) + { + if (log) + { + LPOLESTR adapter_id = NULL; + StringFromIID((REFIID)&a->guid, &adapter_id); + _ftprintf(stderr, TEXT("Adapter \"%") TEXT(PRIsLPTSTR) TEXT("\" already exists (GUID %") + TEXT(PRIsLPOLESTR) TEXT(").\n"), a->szName, adapter_id); + CoTaskMemFree(adapter_id); + } + + return FALSE; + } + } + + return TRUE; +} + +/** + * Returns unique adapter name based on hwid or NULL if name cannot be generated. + * Caller is responsible for freeing it. + */ +LPTSTR +get_unique_adapter_name(LPCTSTR hwid, struct tap_adapter_node *adapter_list) +{ + if (hwid == NULL) + { + return NULL; + } + + LPCTSTR base_name; + if (_tcsicmp(hwid, TEXT("ovpn-dco")) == 0) + { + base_name = TEXT("OpenVPN Data Channel Offload"); + } + else if (_tcsicmp(hwid, TEXT("wintun")) == 0) + { + base_name = TEXT("OpenVPN Wintun"); + } + else if (_tcsicmp(hwid, TEXT("root\\") TEXT(TAP_WIN_COMPONENT_ID)) == 0) + { + base_name = TEXT("OpenVPN TAP-Windows6"); + } + else + { + return NULL; + } + + if (is_adapter_name_available(base_name, adapter_list, FALSE)) + { + return _tcsdup(base_name); + } + + TCHAR itot_buf[10]; + size_t name_len = (_tcslen(base_name) + sizeof(itot_buf) / sizeof(TCHAR) + 2); + LPTSTR name = malloc(name_len * sizeof(TCHAR)); + if (name == NULL) + { + return NULL; + } + for (int i = 1; i < 100; ++i) + { + *name = TEXT('\0'); + _tcscat_s(name, name_len, base_name); + _tcscat_s(name, name_len, TEXT(" #")); + _itot_s(i, itot_buf, sizeof(itot_buf) / sizeof(TCHAR), 10); + _tcscat_s(name, name_len, itot_buf); + + if (is_adapter_name_available(name, adapter_list, FALSE)) + { + return name; + } + } + + return NULL; +} /** * Program entry point @@ -210,50 +294,47 @@ _tmain(int argc, LPCTSTR argv[]) iResult = 1; goto quit; } - if (szName) + /* Get existing network adapters. */ + struct tap_adapter_node *pAdapterList = NULL; + dwResult = tap_list_adapters(NULL, NULL, &pAdapterList); + if (dwResult != ERROR_SUCCESS) { - /* Get existing network adapters. */ - struct tap_adapter_node *pAdapterList = NULL; - dwResult = tap_list_adapters(NULL, NULL, &pAdapterList); - if (dwResult != ERROR_SUCCESS) - { - _ftprintf(stderr, TEXT("Enumerating adapters failed (error 0x%x).\n"), dwResult); - iResult = 1; goto create_delete_adapter; - } + _ftprintf(stderr, TEXT("Enumerating adapters failed (error 0x%x).\n"), dwResult); + iResult = 1; goto create_delete_adapter; + } - /* Check for duplicates. */ - for (struct tap_adapter_node *pAdapter = pAdapterList; pAdapter; pAdapter = pAdapter->pNext) + LPTSTR adapter_name = szName ? _tcsdup(szName) : get_unique_adapter_name(szHwId, pAdapterList); + if (adapter_name) + { + /* Check for duplicates when name was specified, + * otherwise get_adapter_default_name() takes care of it */ + if (szName && !is_adapter_name_available(adapter_name, pAdapterList, TRUE)) { - if (_tcsicmp(szName, pAdapter->szName) == 0) - { - StringFromIID((REFIID)&pAdapter->guid, &szAdapterId); - _ftprintf(stderr, TEXT("Adapter \"%") TEXT(PRIsLPTSTR) TEXT("\" already exists (GUID %") - TEXT(PRIsLPOLESTR) TEXT(").\n"), pAdapter->szName, szAdapterId); - CoTaskMemFree(szAdapterId); - iResult = 1; goto create_cleanup_pAdapterList; - } + iResult = 1; goto create_cleanup_pAdapterList; } /* Rename the adapter. */ - dwResult = tap_set_adapter_name(&guidAdapter, szName, FALSE); + dwResult = tap_set_adapter_name(&guidAdapter, adapter_name, FALSE); if (dwResult != ERROR_SUCCESS) { StringFromIID((REFIID)&guidAdapter, &szAdapterId); _ftprintf(stderr, TEXT("Renaming TUN/TAP adapter %") TEXT(PRIsLPOLESTR) TEXT(" to \"%") TEXT(PRIsLPTSTR) TEXT("\" failed (error 0x%x).\n"), - szAdapterId, szName, dwResult); + szAdapterId, adapter_name, dwResult); CoTaskMemFree(szAdapterId); iResult = 1; goto quit; } iResult = 0; + } create_cleanup_pAdapterList: - tap_free_adapter_list(pAdapterList); - if (iResult) - { - goto create_delete_adapter; - } + free(adapter_name); + + tap_free_adapter_list(pAdapterList); + if (iResult) + { + goto create_delete_adapter; } /* Output adapter GUID. */ -- 2.23.0.windows.1 _______________________________________________ Openvpn-devel mailing list Openvpn-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openvpn-devel
