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# include <3ds.h>
#endif
#ifndef SOCK_DNS
# define SOCK_DNS 0
#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 16 levels of pointers and
* immediately rejecting pointers to itself seems like a fair balance.
*/
#define MAX_ALLOWED_POINTERS 16
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# include <3ds.h>
#endif
#ifndef SOCK_DNS
# define SOCK_DNS 0
#endif
#define BUFFER_LENGTH OF_DNS_RESOLVER_BUFFER_LENGTH
/*
* 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 16 levels of pointers and
* immediately rejecting pointers to itself seems like a fair balance.
*/
#define MAX_ALLOWED_POINTERS 16
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- (void)resolver: (OFDNSResolver *)resolver
didResolveDomainName: (OFString *)domainName
socketAddresses: (OFData *)socketAddresses
context: (id)context
exception: (id)exception;
@end
@interface OFDNSResolver ()
- (void)of_setDefaults;
- (void)of_obtainSystemConfig;
#if defined(OF_HAVE_FILES) && !defined(OF_NINTENDO_3DS)
- (void)of_parseHosts: (OFString *)path;
# if !defined(OF_WINDOWS) && !defined(OF_AMIGAOS4)
- (void)of_parseResolvConf: (OFString *)path;
- (void)of_parseResolvConfOption: (OFString *)option;
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- (void)resolver: (OFDNSResolver *)resolver
didResolveDomainName: (OFString *)domainName
socketAddresses: (OFData *)socketAddresses
context: (id)context
exception: (id)exception;
@end
@interface OFDNSResolver () <OFUDPSocketDelegate>
- (void)of_setDefaults;
- (void)of_obtainSystemConfig;
#if defined(OF_HAVE_FILES) && !defined(OF_NINTENDO_3DS)
- (void)of_parseHosts: (OFString *)path;
# if !defined(OF_WINDOWS) && !defined(OF_AMIGAOS4)
- (void)of_parseResolvConf: (OFString *)path;
- (void)of_parseResolvConfOption: (OFString *)option;
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runLoopMode: (of_run_loop_mode_t)runLoopMode
target: (id)target
selector: (SEL)selector
context: (id)context;
- (void)of_sendQuery: (OFDNSResolverQuery *)query
runLoopMode: (of_run_loop_mode_t)runLoopMode;
- (void)of_queryWithIDTimedOut: (OFDNSResolverQuery *)query;
- (size_t)of_socket: (OFUDPSocket *)sock
didSendBuffer: (void **)buffer
bytesSent: (size_t)bytesSent
receiver: (of_socket_address_t *)receiver
context: (OFDNSResolverQuery *)query
exception: (id)exception;
- (bool)of_socket: (OFUDPSocket *)sock
didReceiveIntoBuffer: (unsigned char *)buffer
length: (size_t)length
sender: (of_socket_address_t)sender
context: (id)context
exception: (id)exception;
@end
#ifndef OF_WII
static OFString *
domainFromHostname(void)
{
char hostname[256];
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runLoopMode: (of_run_loop_mode_t)runLoopMode
target: (id)target
selector: (SEL)selector
context: (id)context;
- (void)of_sendQuery: (OFDNSResolverQuery *)query
runLoopMode: (of_run_loop_mode_t)runLoopMode;
- (void)of_queryWithIDTimedOut: (OFDNSResolverQuery *)query;
@end
#ifndef OF_WII
static OFString *
domainFromHostname(void)
{
char hostname[256];
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[self close];
[_staticHosts release];
[_nameServers release];
[_localDomain release];
[_searchDomains release];
[_lastConfigReload release];
[_IPv4Socket release];
#ifdef OF_HAVE_IPV6
[_IPv6Socket release];
#endif
[_queries release];
[super dealloc];
}
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[self close];
[_staticHosts release];
[_nameServers release];
[_localDomain release];
[_searchDomains release];
[_lastConfigReload release];
[_IPv4Socket cancelAsyncRequests];
[_IPv4Socket release];
#ifdef OF_HAVE_IPV6
[_IPv6Socket cancelAsyncRequests];
[_IPv6Socket release];
#endif
[_queries release];
[super dealloc];
}
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of_socket_address_t address =
of_socket_address_parse_ip(@"::", 0);
_IPv6Socket = [[OFUDPSocket alloc] init];
[_IPv6Socket of_bindToAddress: &address
extraType: SOCK_DNS];
[_IPv6Socket setBlocking: false];
}
sock = _IPv6Socket;
break;
#endif
case OF_SOCKET_ADDRESS_FAMILY_IPV4:
if (_IPv4Socket == nil) {
of_socket_address_t address =
of_socket_address_parse_ip(@"0.0.0.0", 0);
_IPv4Socket = [[OFUDPSocket alloc] init];
[_IPv4Socket of_bindToAddress: &address
extraType: SOCK_DNS];
[_IPv4Socket setBlocking: false];
}
sock = _IPv4Socket;
break;
default:
@throw [OFInvalidArgumentException exception];
}
[sock asyncSendBuffer: [query->_queryData items]
length: [query->_queryData count]
receiver: query->_usedNameServer
runLoopMode: runLoopMode
target: self
selector: @selector(of_socket:didSendBuffer:bytesSent:
receiver:context:exception:)
context: query];
}
- (void)of_queryWithIDTimedOut: (OFDNSResolverQuery *)query
{
OFResolveHostFailedException *exception;
if (query == nil)
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of_socket_address_t address =
of_socket_address_parse_ip(@"::", 0);
_IPv6Socket = [[OFUDPSocket alloc] init];
[_IPv6Socket of_bindToAddress: &address
extraType: SOCK_DNS];
[_IPv6Socket setBlocking: false];
[_IPv6Socket setDelegate: self];
[_IPv6Socket asyncReceiveIntoBuffer: _buffer
length: BUFFER_LENGTH];
}
sock = _IPv6Socket;
break;
#endif
case OF_SOCKET_ADDRESS_FAMILY_IPV4:
if (_IPv4Socket == nil) {
of_socket_address_t address =
of_socket_address_parse_ip(@"0.0.0.0", 0);
_IPv4Socket = [[OFUDPSocket alloc] init];
[_IPv4Socket of_bindToAddress: &address
extraType: SOCK_DNS];
[_IPv4Socket setBlocking: false];
[_IPv4Socket setDelegate: self];
[_IPv4Socket asyncReceiveIntoBuffer: _buffer
length: BUFFER_LENGTH];
}
sock = _IPv4Socket;
break;
default:
@throw [OFInvalidArgumentException exception];
}
[sock asyncSendBuffer: [query->_queryData items]
length: [query->_queryData count]
receiver: query->_usedNameServer
runLoopMode: runLoopMode];
}
- (void)of_queryWithIDTimedOut: (OFDNSResolverQuery *)query
{
OFResolveHostFailedException *exception;
if (query == nil)
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runLoopMode: [[OFRunLoop currentRunLoop] currentMode]];
return;
}
query = [[query retain] autorelease];
[_queries removeObjectForKey: query->_ID];
exception = [OFResolveHostFailedException
exceptionWithHost: query->_host
recordClass: query->_recordClass
recordType: query->_recordType
error: OF_DNS_RESOLVER_ERROR_TIMEOUT];
callback(query->_target, query->_selector, self, query->_domainName,
nil, nil, nil, query->_context, exception);
}
- (size_t)of_socket: (OFUDPSocket *)sock
didSendBuffer: (void **)buffer
bytesSent: (size_t)bytesSent
receiver: (of_socket_address_t *)receiver
context: (OFDNSResolverQuery *)query
exception: (id)exception
{
if (exception != nil) {
query = [[query retain] autorelease];
[_queries removeObjectForKey: query->_ID];
callback(query->_target, query->_selector, self,
query->_domainName, nil, nil, nil, query->_context,
exception);
return 0;
}
/*
* Pass the query as context to make sure that its buffer stays around
* for as long as our receive is pending.
*/
[sock asyncReceiveIntoBuffer: [query allocMemoryWithSize: 512]
length: 512
runLoopMode: [[OFRunLoop currentRunLoop] currentMode]
target: self
selector: @selector(of_socket:didReceiveIntoBuffer:
length:sender:context:exception:)
context: query];
return 0;
}
- (bool)of_socket: (OFUDPSocket *)sock
didReceiveIntoBuffer: (unsigned char *)buffer
length: (size_t)length
sender: (of_socket_address_t)sender
context: (id)context
exception: (id)exception
{
OFDictionary *answerRecords = nil, *authorityRecords = nil;
OFDictionary *additionalRecords = nil;
OFNumber *ID;
OFDNSResolverQuery *query;
if (exception != nil) {
if ([exception respondsToSelector: @selector(errNo)])
return ([exception errNo] == EINTR);
return false;
}
if (length < 2)
/* We can't get the ID to get the query. Ignore packet. */
return true;
ID = [OFNumber numberWithUInt16: (buffer[0] << 8) | buffer[1]];
query = [[[_queries objectForKey: ID] retain] autorelease];
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runLoopMode: [[OFRunLoop currentRunLoop] currentMode]];
return;
}
query = [[query retain] autorelease];
[_queries removeObjectForKey: query->_ID];
/*
* Cancel any pending requests, to avoid a send being still pending and
* trying to access the query once it no longer exists.
*/
[_IPv4Socket cancelAsyncRequests];
[_IPv4Socket asyncReceiveIntoBuffer: _buffer
length: BUFFER_LENGTH];
#ifdef OF_HAVE_IPV6
[_IPv6Socket cancelAsyncRequests];
[_IPv6Socket asyncReceiveIntoBuffer: _buffer
length: BUFFER_LENGTH];
#endif
exception = [OFResolveHostFailedException
exceptionWithHost: query->_host
recordClass: query->_recordClass
recordType: query->_recordType
error: OF_DNS_RESOLVER_ERROR_TIMEOUT];
callback(query->_target, query->_selector, self, query->_domainName,
nil, nil, nil, query->_context, exception);
}
- (bool)socket: (OF_KINDOF(OFUDPSocket *))sock
didReceiveIntoBuffer: (void *)buffer_
length: (size_t)length
sender: (of_socket_address_t)sender
{
unsigned char *buffer = buffer_;
OFDictionary *answerRecords = nil, *authorityRecords = nil;
OFDictionary *additionalRecords = nil;
OFNumber *ID;
OFDNSResolverQuery *query;
if (length < 2)
/* We can't get the ID to get the query. Ignore packet. */
return true;
ID = [OFNumber numberWithUInt16: (buffer[0] << 8) | buffer[1]];
query = [[[_queries objectForKey: ID] retain] autorelease];
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nameServersIndex: query->_nameServersIndex
searchDomainsIndex: query->_searchDomainsIndex
runLoopMode: runLoopMode
target: query->_target
selector: query->_selector
context: query->_context];
return false;
}
error = OF_DNS_RESOLVER_ERROR_SERVER_NAME_ERROR;
break;
case 4:
error = OF_DNS_RESOLVER_ERROR_SERVER_NOT_IMPLEMENTED;
break;
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nameServersIndex: query->_nameServersIndex
searchDomainsIndex: query->_searchDomainsIndex
runLoopMode: runLoopMode
target: query->_target
selector: query->_selector
context: query->_context];
return true;
}
error = OF_DNS_RESOLVER_ERROR_SERVER_NAME_ERROR;
break;
case 4:
error = OF_DNS_RESOLVER_ERROR_SERVER_NOT_IMPLEMENTED;
break;
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authorityRecords = parseSection(buffer, length, &i,
numAuthorityRecords);
additionalRecords = parseSection(buffer, length, &i,
numAdditionalRecords);
} @catch (id e) {
callback(query->_target, query->_selector, self,
query->_domainName, nil, nil, nil, query->_context, e);
return false;
}
callback(query->_target, query->_selector, self, query->_domainName,
answerRecords, authorityRecords, additionalRecords,
query->_context, nil);
return false;
}
- (void)asyncResolveSocketAddressesForHost: (OFString *)host
target: (id)target
selector: (SEL)selector
context: (id)context
{
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authorityRecords = parseSection(buffer, length, &i,
numAuthorityRecords);
additionalRecords = parseSection(buffer, length, &i,
numAdditionalRecords);
} @catch (id e) {
callback(query->_target, query->_selector, self,
query->_domainName, nil, nil, nil, query->_context, e);
return true;
}
callback(query->_target, query->_selector, self, query->_domainName,
answerRecords, authorityRecords, additionalRecords,
query->_context, nil);
return true;
}
- (void)asyncResolveSocketAddressesForHost: (OFString *)host
target: (id)target
selector: (SEL)selector
context: (id)context
{
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