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# include <iphlpapi.h>
# undef interface
#endif
/*
* RFC 1035 doesn't specify if pointers to pointers are allowed, and if so how
* many. Since it's unspecified, we have to assume that it might happen, but we
* also want to limit it to avoid DoS. Limiting it to 4 levels of pointers and
* rejecting pointers to itself seems like a fair balance.
* also want to limit it to avoid DoS. Limiting it to 16 levels of pointers and
* immediately rejecting pointers to itself seems like a fair balance.
*/
#define ALLOWED_POINTER_LEVELS 4
#define MAX_ALLOWED_POINTERS 16
/*
* TODO:
*
* - Timeouts
* - Resolve with each search domain
* - Iterate through name servers
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return [[[OFADNSResourceRecord alloc]
initWithName: name
address: address
TTL: TTL] autorelease];
} else if (recordType == OF_DNS_RESOURCE_RECORD_TYPE_NS) {
size_t j = i;
OFString *authoritativeHost = parseName(buffer, length, &j,
ALLOWED_POINTER_LEVELS);
MAX_ALLOWED_POINTERS);
if (j != i + dataLength)
@throw [OFInvalidServerReplyException exception];
return [[[OFNSDNSResourceRecord alloc]
initWithName: name
recordClass: recordClass
authoritativeHost: authoritativeHost
TTL: TTL] autorelease];
} else if (recordType == OF_DNS_RESOURCE_RECORD_TYPE_CNAME) {
size_t j = i;
OFString *alias = parseName(buffer, length, &j,
ALLOWED_POINTER_LEVELS);
MAX_ALLOWED_POINTERS);
if (j != i + dataLength)
@throw [OFInvalidServerReplyException exception];
return [[[OFCNAMEDNSResourceRecord alloc]
initWithName: name
recordClass: recordClass
alias: alias
TTL: TTL] autorelease];
} else if (recordType == OF_DNS_RESOURCE_RECORD_TYPE_SOA) {
size_t j = i;
OFString *primaryNameServer = parseName(buffer, length, &j,
ALLOWED_POINTER_LEVELS);
MAX_ALLOWED_POINTERS);
OFString *responsiblePerson;
uint32_t serialNumber, refreshInterval, retryInterval;
uint32_t expirationInterval, minTTL;
if (j > i + dataLength)
@throw [OFInvalidServerReplyException exception];
responsiblePerson = parseName(buffer, length, &j,
ALLOWED_POINTER_LEVELS);
MAX_ALLOWED_POINTERS);
if (dataLength - (j - i) != 20)
@throw [OFInvalidServerReplyException exception];
serialNumber = (buffer[j] << 24) | (buffer[j + 1] << 16) |
(buffer[j + 2] << 8) | buffer[j + 3];
refreshInterval = (buffer[j + 4] << 24) |
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retryInterval: retryInterval
expirationInterval: expirationInterval
minTTL: minTTL
TTL: TTL] autorelease];
} else if (recordType == OF_DNS_RESOURCE_RECORD_TYPE_PTR) {
size_t j = i;
OFString *domainName = parseName(buffer, length, &j,
ALLOWED_POINTER_LEVELS);
MAX_ALLOWED_POINTERS);
if (j != i + dataLength)
@throw [OFInvalidServerReplyException exception];
return [[[OFPTRDNSResourceRecord alloc]
initWithName: name
recordClass: recordClass
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if (dataLength < 2)
@throw [OFInvalidServerReplyException exception];
preference = (buffer[i] << 8) | buffer[i + 1];
j = i + 2;
mailExchange = parseName(buffer, length, &j,
ALLOWED_POINTER_LEVELS);
MAX_ALLOWED_POINTERS);
if (j != i + dataLength)
@throw [OFInvalidServerReplyException exception];
return [[[OFMXDNSResourceRecord alloc]
initWithName: name
recordClass: recordClass
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}
- (instancetype)init
{
self = [super init];
@try {
void *pool = objc_autoreleasePoolPush();
#ifdef OF_WINDOWS
void *pool;
OFString *path;
#endif
_minNumberOfDotsInAbsoluteName = 1;
#ifdef OF_HAVE_FILES
# if defined(OF_WINDOWS)
pool = objc_autoreleasePoolPush();
path = [[OFWindowsRegistryKey localMachineKey]
stringForValue: @"DataBasePath"
subKeyPath: @"SYSTEM\\CurrentControlSet\\Services\\"
@"Tcpip\\Parameters"];
path = [path stringByAppendingPathComponent: @"hosts"];
if (path != nil)
[self of_parseHosts: path];
objc_autoreleasePoolPop(pool);
# elif defined(OF_HAIKU)
[self of_parseHosts: @"/boot/common/settings/network/hosts"];
# elif defined(OF_MORPHOS)
[self of_parseHosts: @"ENVARC:sys/net/hosts"];
# elif defined(OF_AMIGAOS4)
[self of_parseHosts: @"DEVS:Internet/hosts"];
# elif defined(OF_AMIGAOS)
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[self of_parseResolvConf: @"/etc/resolv.conf.tail"];
# endif
#endif
#ifdef OF_WINDOWS
[self of_parseNetworkParams];
#endif
if (_staticHosts == nil)
_staticHosts = [[OFDictionary alloc] init];
if (_staticHosts == nil) {
OFArray *localhost =
#ifdef HAVE_IPV6
localhost = [OFArray arrayWithObjects:
@"::1", @"127.0.0.1", nil];
#else
localhost = [OFArray arrayWithObject: @"127.0.0.1"];
#endif
_staticHosts = [[OFDictionary alloc]
initWithObject: localhost
forKey: @"localhost"];
}
if (_nameServers == nil)
#ifdef HAVE_IPV6
_nameServers = [[OFArray alloc] initWithObjects:
@"127.0.0.1", @"::1", nil];
_nameServers = [[OFArray alloc]
initWithObjects: @"127.0.0.1", @"::1", nil];
#else
_nameServers = [[OFArray alloc]
initWithObject: @"127.0.0.1"];
#endif
if (_localDomain == nil)
_localDomain = [domainFromHostname() copy];
if (_searchDomains == nil) {
if (_localDomain != nil)
_searchDomains = [[OFArray alloc]
initWithObject: _localDomain];
else
_searchDomains = [[OFArray alloc] init];
}
_queries = [[OFMutableDictionary alloc] init];
objc_autoreleasePoolPop(pool);
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
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/*
* Skip over the questions - we use the ID to identify the
* query.
*
* TODO: Compare to our query, just in case?
*/
for (uint_fast16_t j = 0; j < numQuestions; j++) {
parseName(buffer, length, &i, ALLOWED_POINTER_LEVELS);
parseName(buffer, length, &i, MAX_ALLOWED_POINTERS);
i += 4;
}
for (uint_fast16_t j = 0; j < numAnswers; j++) {
OFString *name = parseName(buffer, length, &i,
ALLOWED_POINTER_LEVELS);
MAX_ALLOWED_POINTERS);
of_dns_resource_record_class_t recordClass;
of_dns_resource_record_type_t recordType;
uint32_t TTL;
uint16_t dataLength;
OFDNSResourceRecord *record;
if (i + 10 > length)
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