/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018, 2019, 2020
* Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include "unistd_wrapper.h"
#import "OFDNSResolverSettings.h"
#import "OFArray.h"
#import "OFCharacterSet.h"
#import "OFDate.h"
#import "OFDictionary.h"
#import "OFFile.h"
#import "OFLocale.h"
#import "OFString.h"
#ifdef OF_WINDOWS
# import "OFWindowsRegistryKey.h"
#endif
#import "OFInvalidFormatException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfMemoryException.h"
#ifdef OF_WINDOWS
# define interface struct
# include <iphlpapi.h>
# undef interface
#endif
#ifdef OF_NINTENDO_3DS
/* Newer versions of libctru started using id as a parameter name. */
# define id id_3ds
# include <3ds.h>
# undef id
#endif
#import "socket_helpers.h"
#if defined(OF_HAIKU)
# define HOSTS_PATH @"/system/settings/network/hosts"
# define RESOLV_CONF_PATH @"/system/settings/network/resolv.conf"
#elif defined(OF_MORPHOS)
# define HOSTS_PATH @"ENV:sys/net/hosts"
# define RESOLV_CONF_PATH @"ENV:sys/net/resolv.conf"
#elif defined(OF_AMIGAOS4)
# define HOSTS_PATH @"DEVS:Internet/hosts"
#elif defined(OF_AMIGAOS)
# define HOSTS_PATH @"AmiTCP:db/hosts"
# define RESOLV_CONF_PATH @"AmiTCP:db/resolv.conf"
#else
# define HOSTS_PATH @"/etc/hosts"
# define RESOLV_CONF_PATH @"/etc/resolv.conf"
#endif
#ifndef OF_WII
static OFString *
domainFromHostname(void)
{
char hostname[256];
OFString *domain;
if (gethostname(hostname, 256) != 0)
return nil;
domain = [OFString stringWithCString: hostname
encoding: [OFLocale encoding]];
@try {
of_socket_address_parse_ip(domain, 0);
/*
* If we are still here, the host name is a valid IP address.
* We can't use that as local domain.
*/
return nil;
} @catch (OFInvalidFormatException *e) {
/* Not an IP address -> we can use it if it contains a dot. */
size_t pos = [domain rangeOfString: @"."].location;
if (pos == OF_NOT_FOUND)
return nil;
return [domain substringWithRange:
of_range(pos + 1, domain.length - pos - 1)];
}
}
#endif
@implementation OFDNSResolverSettings
- (void)dealloc
{
[_staticHosts release];
[_nameServers release];
[_localDomain release];
[_searchDomains release];
[_lastConfigReload release];
[super dealloc];
}
- (id)copy
{
OFDNSResolverSettings *copy = [[OFDNSResolverSettings alloc] init];
@try {
copy->_staticHosts = [_staticHosts copy];
copy->_nameServers = [_nameServers copy];
copy->_localDomain = [_localDomain copy];
copy->_searchDomains = [_searchDomains copy];
copy->_timeout = _timeout;
copy->_maxAttempts = _maxAttempts;
copy->_minNumberOfDotsInAbsoluteName =
_minNumberOfDotsInAbsoluteName;
copy->_usesTCP = _usesTCP;
copy->_configReloadInterval = _configReloadInterval;
copy->_lastConfigReload = [_lastConfigReload copy];
} @catch (id e) {
[copy release];
@throw e;
}
return copy;
}
- (void)setDefaults
{
[_staticHosts release];
_staticHosts = nil;
[_nameServers release];
_nameServers = nil;
[_localDomain release];
_localDomain = nil;
[_searchDomains release];
_searchDomains = nil;
_timeout = 2;
_maxAttempts = 3;
_minNumberOfDotsInAbsoluteName = 1;
_usesTCP = false;
#ifndef OF_NINTENDO_3DS
_configReloadInterval = 2;
#else
_configReloadInterval = 0;
#endif
}
#if defined(OF_HAVE_FILES) && !defined(OF_NINTENDO_3DS)
- (void)parseHosts: (OFString *)path
{
void *pool = objc_autoreleasePoolPush();
OFCharacterSet *whitespaceCharacterSet =
[OFCharacterSet whitespaceCharacterSet];
OFMutableDictionary *staticHosts;
OFFile *file;
OFString *line;
OFEnumerator *enumerator;
OFMutableArray *addresses;
@try {
file = [OFFile fileWithPath: path
mode: @"r"];
} @catch (OFOpenItemFailedException *e) {
objc_autoreleasePoolPop(pool);
return;
}
staticHosts = [OFMutableDictionary dictionary];
while ((line = [file readLine]) != nil) {
void *pool2 = objc_autoreleasePoolPush();
OFArray *components, *hosts;
size_t pos;
OFString *address;
pos = [line rangeOfString: @"#"].location;
if (pos != OF_NOT_FOUND)
line = [line substringWithRange: of_range(0, pos)];
components = [line
componentsSeparatedByCharactersInSet: whitespaceCharacterSet
options: OF_STRING_SKIP_EMPTY];
if (components.count < 2) {
objc_autoreleasePoolPop(pool2);
continue;
}
address = components.firstObject;
hosts = [components objectsInRange:
of_range(1, components.count - 1)];
for (OFString *host in hosts) {
addresses = [staticHosts objectForKey: host];
if (addresses == nil) {
addresses = [OFMutableArray array];
[staticHosts setObject: addresses
forKey: host];
}
[addresses addObject: address];
}
objc_autoreleasePoolPop(pool2);
}
enumerator = [staticHosts objectEnumerator];
while ((addresses = [enumerator nextObject]) != nil)
[addresses makeImmutable];
[staticHosts makeImmutable];
[_staticHosts release];
_staticHosts = [staticHosts copy];
objc_autoreleasePoolPop(pool);
}
# if !defined(OF_WINDOWS) && !defined(OF_AMIGAOS4)
- (void)parseResolvConfOption: (OFString *)option
{
@try {
if ([option hasPrefix: @"ndots:"]) {
option = [option substringWithRange:
of_range(6, option.length - 6)];
_minNumberOfDotsInAbsoluteName =
(unsigned int)option.decimalValue;
} else if ([option hasPrefix: @"timeout:"]) {
option = [option substringWithRange:
of_range(8, option.length - 8)];
_timeout = option.decimalValue;
} else if ([option hasPrefix: @"attempts:"]) {
option = [option substringWithRange:
of_range(9, option.length - 9)];
_maxAttempts = (unsigned int)option.decimalValue;
} else if ([option hasPrefix: @"reload-period:"]) {
option = [option substringWithRange:
of_range(14, option.length - 14)];
_configReloadInterval = option.decimalValue;
} else if ([option isEqual: @"tcp"])
_usesTCP = true;
} @catch (OFInvalidFormatException *e) {
}
}
- (void)parseResolvConf: (OFString *)path
{
void *pool = objc_autoreleasePoolPush();
OFCharacterSet *whitespaceCharacterSet =
[OFCharacterSet whitespaceCharacterSet];
OFCharacterSet *commentCharacters = [OFCharacterSet
characterSetWithCharactersInString: @"#;"];
OFMutableArray *nameServers = [[_nameServers mutableCopy] autorelease];
OFFile *file;
OFString *line;
@try {
file = [OFFile fileWithPath: path
mode: @"r"];
} @catch (OFOpenItemFailedException *e) {
objc_autoreleasePoolPop(pool);
return;
}
if (nameServers == nil)
nameServers = [OFMutableArray array];
while ((line = [file readLine]) != nil) {
void *pool2 = objc_autoreleasePoolPush();
size_t pos;
OFArray *components, *arguments;
OFString *option;
pos = [line indexOfCharacterFromSet: commentCharacters];
if (pos != OF_NOT_FOUND)
line = [line substringWithRange: of_range(0, pos)];
components = [line
componentsSeparatedByCharactersInSet: whitespaceCharacterSet
options: OF_STRING_SKIP_EMPTY];
if (components.count < 2) {
objc_autoreleasePoolPop(pool2);
continue;
}
option = components.firstObject;
arguments = [components objectsInRange:
of_range(1, components.count - 1)];
if ([option isEqual: @"nameserver"]) {
if (arguments.count != 1) {
objc_autoreleasePoolPop(pool2);
continue;
}
[nameServers addObject: [arguments firstObject]];
} else if ([option isEqual: @"domain"]) {
if (arguments.count != 1) {
objc_autoreleasePoolPop(pool2);
continue;
}
[_localDomain release];
_localDomain = [arguments.firstObject copy];
} else if ([option isEqual: @"search"]) {
[_searchDomains release];
_searchDomains = [arguments copy];
} else if ([option isEqual: @"options"])
for (OFString *argument in arguments)
[self parseResolvConfOption: argument];
objc_autoreleasePoolPop(pool2);
}
[nameServers makeImmutable];
[_nameServers release];
_nameServers = [nameServers copy];
objc_autoreleasePoolPop(pool);
}
# endif
#endif
#ifdef OF_WINDOWS
- (void)obtainWindowsSystemConfig
{
of_string_encoding_t encoding = [OFLocale encoding];
OFMutableArray *nameServers;
/*
* We need more space than FIXED_INFO in case we have more than one
* name server, but we also want it to be properly aligned, meaning we
* can't just get a buffer of bytes. Thus, we just get space for 8.
*/
FIXED_INFO fixedInfo[8];
ULONG length = sizeof(fixedInfo);
PIP_ADDR_STRING iter;
if (GetNetworkParams(fixedInfo, &length) != ERROR_SUCCESS)
return;
nameServers = [OFMutableArray array];
for (iter = &fixedInfo->DnsServerList; iter != NULL; iter = iter->Next)
[nameServers addObject:
[OFString stringWithCString: iter->IpAddress.String
encoding: encoding]];
if (nameServers.count > 0) {
[nameServers makeImmutable];
_nameServers = [nameServers copy];
}
if (fixedInfo->DomainName[0] != '\0')
_localDomain = [[OFString alloc]
initWithCString: fixedInfo->DomainName
encoding: encoding];
}
#endif
#ifdef OF_AMIGAOS4
- (void)obtainAmigaOS4SystemConfig
{
OFMutableArray *nameServers = [OFMutableArray array];
of_string_encoding_t encoding = [OFLocale encoding];
struct List *nameServerList = ObtainDomainNameServerList();
char buffer[MAXHOSTNAMELEN];
if (nameServerList == NULL)
@throw [OFOutOfMemoryException exception];
@try {
struct DomainNameServerNode *iter =
(struct DomainNameServerNode *)&nameServerList->lh_Head;
while (iter->dnsn_MinNode.mln_Succ != NULL) {
if (iter->dnsn_UseCount != 0 &&
iter->dnsn_Address != NULL) {
OFString *address = [OFString
stringWithCString: iter->dnsn_Address
encoding: encoding];
[nameServers addObject: address];
}
iter = (struct DomainNameServerNode *)
iter->dnsn_MinNode.mln_Succ;
}
} @finally {
ReleaseDomainNameServerList(nameServerList);
}
if (nameServers.count > 0) {
[nameServers makeImmutable];
_nameServers = [nameServers copy];
}
if (GetDefaultDomainName(buffer, sizeof(buffer)))
_localDomain = [[OFString alloc] initWithCString: buffer
encoding: encoding];
}
#endif
#ifdef OF_NINTENDO_3DS
- (void)obtainNintendo3DSSytemConfig
{
OFMutableArray *nameServers = [OFMutableArray array];
union {
/*
* For some unknown reason, this needs a 336 bytes buffer and
* always returns 336 bytes.
*/
char bytes[336];
SOCU_DNSTableEntry entries[2];
} buffer;
socklen_t optLen = sizeof(buffer);
if (SOCU_GetNetworkOpt(SOL_CONFIG, NETOPT_DNS_TABLE,
&buffer, &optLen) != 0)
return;
/*
* We're fine if this gets smaller in a future release (unlikely), as
* long as two entries still fit.
*/
if (optLen < sizeof(buffer.entries))
return;
for (uint_fast8_t i = 0; i < 2; i++) {
uint32_t ip = OF_BSWAP32_IF_LE(buffer.entries[i].ip.s_addr);
if (ip == 0)
continue;
[nameServers addObject: [OFString stringWithFormat:
@"%u.%u.%u.%u", (ip >> 24) & 0xFF, (ip >> 16) & 0xFF,
(ip >> 8) & 0xFF, ip & 0xFF]];
}
if (nameServers.count > 0) {
[nameServers makeImmutable];
_nameServers = [nameServers copy];
}
}
#endif
- (void)reload
{
void *pool;
#ifdef OF_WINDOWS
OFString *path;
#endif
/*
* TODO: Rather than reparsing every time, check what actually changed
* (mtime) and only reset those.
*/
if (_lastConfigReload != nil && _configReloadInterval > 0 &&
_lastConfigReload.timeIntervalSinceNow < _configReloadInterval)
return;
pool = objc_autoreleasePoolPush();
[self setDefaults];
#if defined(OF_WINDOWS)
# ifdef OF_HAVE_FILES
OFWindowsRegistryKey *key = [[OFWindowsRegistryKey localMachineKey]
openSubkeyAtPath: @"SYSTEM\\CurrentControlSet\\Services\\"
@"Tcpip\\Parameters"
securityAndAccessRights: KEY_QUERY_VALUE];
path = [[[key stringForValue: @"DataBasePath"]
stringByAppendingPathComponent: @"hosts"]
stringByExpandingWindowsEnvironmentStrings];
if (path != nil)
[self parseHosts: path];
# endif
[self obtainWindowsSystemConfig];
#elif defined(OF_AMIGAOS4)
[self parseHosts: HOSTS_PATH];
[self obtainAmigaOS4SystemConfig];
#elif defined(OF_NINTENDO_3DS)
[self obtainNintendo3DSSytemConfig];
#elif defined(OF_HAVE_FILES)
[self parseHosts: HOSTS_PATH];
[self parseResolvConf: RESOLV_CONF_PATH];
#endif
if (_staticHosts == nil) {
OFArray *localhost =
#ifdef OF_HAVE_IPV6
[OFArray arrayWithObjects: @"::1", @"127.0.0.1", nil];
#else
[OFArray arrayWithObject: @"127.0.0.1"];
#endif
_staticHosts = [[OFDictionary alloc]
initWithObject: localhost
forKey: @"localhost"];
}
if (_nameServers == nil)
#ifdef OF_HAVE_IPV6
_nameServers = [[OFArray alloc]
initWithObjects: @"127.0.0.1", @"::1", nil];
#else
_nameServers = [[OFArray alloc] initWithObject: @"127.0.0.1"];
#endif
#ifndef OF_WII
if (_localDomain == nil)
_localDomain = [domainFromHostname() copy];
#endif
if (_searchDomains == nil) {
if (_localDomain != nil)
_searchDomains = [[OFArray alloc]
initWithObject: _localDomain];
else
_searchDomains = [[OFArray alloc] init];
}
objc_autoreleasePoolPop(pool);
}
@end