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4c086a2446
The sources can be obtained via: https://opensource.apple.com/tarballs/mDNSResponder/mDNSResponder-878.1.1.tar.gz Update #3522.
558 lines
18 KiB
C
558 lines
18 KiB
C
/* -*- Mode: C; tab-width: 4 -*-
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*
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* Copyright (c) 2011-2013 Apple Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mDNSEmbeddedAPI.h"
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#include "mDNSMacOSX.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/event.h>
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#include <netinet/tcp.h>
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mDNSexport mDNS mDNSStorage;
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#define ValidSocket(s) ((s) >= 0)
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// Global to store the 4 DNS Proxy Listeners (UDPv4/6, TCPv4/6)
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static int dp_listener[4];
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#define NUM_PROXY_TCP_CONNS 100
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typedef struct
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{
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TCPSocket sock;
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DNSMessage *reply;
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mDNSu16 replyLen;
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mDNSu32 nread;
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} ProxyTCPInfo_t;
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// returns -1 for failures including the other end closing the socket
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// returns 0 if successful in reading data, but still not read the data fully
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// returns 1 if successful in reading all the data
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mDNSlocal int ProxyTCPRead(ProxyTCPInfo_t *tcpInfo)
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{
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long n;
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mDNSBool closed;
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if (tcpInfo->nread < 2) // First read the two-byte length preceeding the DNS message
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{
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mDNSu8 *lenptr = (mDNSu8 *)&tcpInfo->replyLen;
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n = mDNSPlatformReadTCP(&tcpInfo->sock, lenptr + tcpInfo->nread, 2 - tcpInfo->nread, &closed);
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if (n < 0 || closed)
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{
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LogMsg("ProxyTCPRead: attempt to read message length failed");
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return -1;
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}
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tcpInfo->nread += n;
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if (tcpInfo->nread < 2)
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{
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LogMsg("ProxyTCPRead: nread %d, n %d", tcpInfo->nread, n);
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return 0;
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}
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tcpInfo->replyLen = (mDNSu16)((mDNSu16)lenptr[0] << 8 | lenptr[1]);
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if (tcpInfo->replyLen < sizeof(DNSMessageHeader))
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{
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LogMsg("ProxyTCPRead: Message length too short (%d bytes)", tcpInfo->replyLen);
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return -1;
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}
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tcpInfo->reply = mallocL("ProxyTCPInfo", tcpInfo->replyLen);
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if (!tcpInfo->reply)
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{
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LogMsg("ProxyTCPRead: Memory failure");
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return -1;
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}
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}
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n = mDNSPlatformReadTCP(&tcpInfo->sock, ((char *)tcpInfo->reply) + (tcpInfo->nread - 2), tcpInfo->replyLen - (tcpInfo->nread - 2), &closed);
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if (n < 0 || closed)
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{
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LogMsg("ProxyTCPRead: read failure n %d, closed %d", n, closed);
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return -1;
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}
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tcpInfo->nread += n;
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if ((tcpInfo->nread - 2) != tcpInfo->replyLen)
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return 0;
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else
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return 1;
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}
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mDNSlocal void ProxyTCPSocketCallBack(int s1, short filter, void *context, __unused mDNSBool encounteredEOF)
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{
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int ret;
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struct sockaddr_storage from;
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struct sockaddr_storage to;
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mDNSAddr senderAddr, destAddr;
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mDNSIPPort senderPort;
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ProxyTCPInfo_t *ti = (ProxyTCPInfo_t *)context;
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TCPSocket *sock = &ti->sock;
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KQSocketSet *kq = &sock->ss;
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struct tcp_info tcp_if;
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socklen_t size = sizeof(tcp_if);
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int32_t intf_id = 0;
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(void) filter;
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ret = ProxyTCPRead(ti);
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if (ret == -1)
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{
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mDNSPlatformDisposeProxyContext(ti);
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return;
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}
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else if (!ret)
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{
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debugf("ProxyTCPReceive: Not yet read completely Actual length %d, Read length %d", ti->replyLen, ti->nread);
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return;
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}
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// We read all the data and hence not interested in read events anymore
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KQueueSet(s1, EV_DELETE, EVFILT_READ, sock->kqEntry);
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mDNSPlatformMemZero(&to, sizeof(to));
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mDNSPlatformMemZero(&from, sizeof(from));
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socklen_t len = sizeof(to);
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ret = getsockname(s1, (struct sockaddr*) &to, &len);
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if (ret < 0)
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{
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LogMsg("ProxyTCPReceive: getsockname(fd=%d) errno %d", s1, errno);
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mDNSPlatformDisposeProxyContext(ti);
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return;
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}
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ret = getpeername(s1, (struct sockaddr*) &from, &len);
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if (ret < 0)
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{
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LogMsg("ProxyTCPReceive: getpeername(fd=%d) errno %d", s1, errno);
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mDNSPlatformDisposeProxyContext(ti);
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return;
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}
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if (getsockopt(s1, IPPROTO_TCP, TCP_INFO, &tcp_if, &size) != 0)
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{
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LogMsg("ProxyTCPReceive: getsockopt for TCP_INFO failed (fd=%d) errno %d", s1, errno);
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return;
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}
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intf_id = tcp_if.tcpi_last_outif;
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if (from.ss_family == AF_INET)
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{
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struct sockaddr_in *s = (struct sockaddr_in*)&from;
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senderAddr.type = mDNSAddrType_IPv4;
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senderAddr.ip.v4.NotAnInteger = s->sin_addr.s_addr;
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senderPort.NotAnInteger = s->sin_port;
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s = (struct sockaddr_in *)&to;
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destAddr.type = mDNSAddrType_IPv4;
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destAddr.ip.v4.NotAnInteger = s->sin_addr.s_addr;
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LogInfo("ProxyTCPReceive received IPv4 packet(len %d) from %#-15a to %#-15a on skt %d %s ifindex %d",
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ti->replyLen, &senderAddr, &destAddr, s1, NULL, intf_id);
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}
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else if (from.ss_family == AF_INET6)
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&from;
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senderAddr.type = mDNSAddrType_IPv6;
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senderAddr.ip.v6 = *(mDNSv6Addr*)&sin6->sin6_addr;
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senderPort.NotAnInteger = sin6->sin6_port;
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sin6 = (struct sockaddr_in6 *)&to;
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destAddr.type = mDNSAddrType_IPv6;
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destAddr.ip.v6 = *(mDNSv6Addr*)&sin6->sin6_addr;
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LogInfo("ProxyTCPReceive received IPv6 packet(len %d) from %#-15a to %#-15a on skt %d %s ifindex %d",
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ti->replyLen, &senderAddr, &destAddr, s1, NULL, intf_id);
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}
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else
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{
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LogMsg("ProxyTCPReceive from is unknown address family %d", from.ss_family);
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mDNSPlatformDisposeProxyContext(ti);
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return;
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}
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// We pass sock for the TCPSocket and the "ti" for context as that's what we want to free at the end.
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// In the UDP case, there is just a single socket and nothing to free. Hence, the context (last argument)
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// would be NULL.
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kq->m->p->TCPProxyCallback(sock, ti->reply, (mDNSu8 *)ti->reply + ti->replyLen, &senderAddr, senderPort, &destAddr,
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UnicastDNSPort, (mDNSInterfaceID)(uintptr_t)intf_id, ti);
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}
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mDNSlocal void ProxyTCPAccept(int s1, short filter, void *context, __unused mDNSBool encounteredEOF)
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{
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int newfd;
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struct sockaddr_storage ss;
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socklen_t sslen = sizeof(ss);
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const int on = 1;
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KQSocketSet *listenSet = (KQSocketSet *)context;
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(void) filter;
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while ((newfd = accept(s1, (struct sockaddr *)&ss, &sslen)) != -1)
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{
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int err;
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int *s;
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KQueueEntry *k;
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KQSocketSet *kq;
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// Even though we just need a single KQueueEntry, for simplicity we re-use
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// the KQSocketSet
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ProxyTCPInfo_t *ti = mallocL("ProxyTCPContext", sizeof(ProxyTCPInfo_t));
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if (!ti)
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{
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LogMsg("ProxyTCPAccept: cannot allocate TCPSocket");
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close(newfd);
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return;
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}
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mDNSPlatformMemZero(ti, sizeof(ProxyTCPInfo_t));
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TCPSocket *sock = &ti->sock;
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kq = &sock->ss;
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kq->sktv4 = -1;
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kq->sktv6 = -1;
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kq->m = listenSet->m;
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fcntl(newfd, F_SETFL, fcntl(newfd, F_GETFL, 0) | O_NONBLOCK); // set non-blocking
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if (ss.ss_family == AF_INET)
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{
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s = &kq->sktv4;
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k = &kq->kqsv4;
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// Receive interface identifiers
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err = setsockopt(newfd, IPPROTO_IP, IP_RECVIF, &on, sizeof(on));
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if (err)
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{
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LogMsg("ProxyTCPAccept: IP_RECVIF %d errno %d (%s)", newfd, errno, strerror(errno));
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mDNSPlatformDisposeProxyContext(ti);
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close(newfd);
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return;
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}
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}
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else
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{
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s = &kq->sktv6;
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k = &kq->kqsv6;
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// We want to receive destination addresses and receive interface identifiers
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err = setsockopt(newfd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on));
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if (err)
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{
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LogMsg("ProxyTCPAccept: IP_RECVPKTINFO %d errno %d (%s)", newfd, errno, strerror(errno));
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mDNSPlatformDisposeProxyContext(ti);
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close(newfd);
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return;
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}
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}
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*s = newfd;
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// mDNSPlatformReadTCP/WriteTCP (unlike the UDP counterpart) does not provide the destination address
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// from which we can infer the destination address family. Hence we need to remember that here.
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// Instead of remembering the address family, we remember the right fd.
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sock->fd = newfd;
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sock->kqEntry = k;
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k->KQcallback = ProxyTCPSocketCallBack;
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k->KQcontext = ti;
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k->KQtask = "TCP Proxy packet reception";
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#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
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k->readSource = mDNSNULL;
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k->writeSource = mDNSNULL;
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k->fdClosed = mDNSfalse;
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#endif
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KQueueSet(*s, EV_ADD, EVFILT_READ, k);
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}
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}
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mDNSlocal mStatus SetupUDPProxySocket(int skt, KQSocketSet *cp, u_short sa_family, mDNSBool useBackgroundTrafficClass)
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{
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int *s = (sa_family == AF_INET) ? &cp->sktv4 : &cp->sktv6;
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KQueueEntry *k = (sa_family == AF_INET) ? &cp->kqsv4 : &cp->kqsv6;
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const int on = 1;
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mStatus err = mStatus_NoError;
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cp->m = &mDNSStorage;
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cp->closeFlag = mDNSNULL;
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// set default traffic class
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// setTrafficClass(skt, mDNSfalse);
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(void) useBackgroundTrafficClass;
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if (sa_family == AF_INET)
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{
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err = setsockopt(skt, IPPROTO_IP, IP_RECVDSTADDR, &on, sizeof(on));
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if (err < 0)
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{
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LogMsg("SetupUDPProxySocket: IP_RECVDSTADDR %d errno %d (%s)", skt, errno, strerror(errno));
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return err;
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}
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// We want to receive interface identifiers
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err = setsockopt(skt, IPPROTO_IP, IP_RECVIF, &on, sizeof(on));
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if (err < 0)
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{
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LogMsg("SetupUDPProxySocket: IP_RECVIF %d errno %d (%s)", skt, errno, strerror(errno));
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return err;
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}
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}
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else if (sa_family == AF_INET6)
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{
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// We want to receive destination addresses and receive interface identifiers
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err = setsockopt(skt, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on));
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if (err < 0)
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{
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LogMsg("SetupUDPProxySocket: IPV6_RECVPKTINFO %d errno %d (%s)", skt, errno, strerror(errno));
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return err;
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}
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// We want to receive packet hop count value so we can check it
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err = setsockopt(skt, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, sizeof(on));
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if (err < 0)
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{
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LogMsg("SetupUDPProxySocket: IPV6_RECVHOPLIMIT %d errno %d (%s)", skt, errno, strerror(errno));
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return err;
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}
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}
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else
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{
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LogMsg("SetupUDPProxySocket: wrong family %d", sa_family);
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return -1;
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}
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if (fcntl(skt, F_SETFL, fcntl(skt, F_GETFL, 0) | O_NONBLOCK) < 0)
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{
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LogMsg("SetupUDPProxySocket: fnctl failed %d", errno);
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return -1;
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}
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*s = skt;
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//k->KQcallback = ProxyUDPSocketCallBack;
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k->KQcallback = myKQSocketCallBack;
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k->KQcontext = cp;
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k->KQtask = "UDP Proxy packet reception";
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#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
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k->readSource = mDNSNULL;
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k->writeSource = mDNSNULL;
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k->fdClosed = mDNSfalse;
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#endif
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KQueueSet(*s, EV_ADD, EVFILT_READ, k);
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return(err);
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}
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mDNSlocal mStatus SetupTCPProxySocket(int skt, KQSocketSet *cp, u_short sa_family, mDNSBool useBackgroundTrafficClass)
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{
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int *s = (sa_family == AF_INET) ? &cp->sktv4 : &cp->sktv6;
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KQueueEntry *k = (sa_family == AF_INET) ? &cp->kqsv4 : &cp->kqsv6;
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mStatus err;
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cp->m = &mDNSStorage;
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// XXX may not be used by the TCP codepath
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cp->closeFlag = mDNSNULL;
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// for TCP sockets, the traffic class is set once and not changed
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// setTrafficClass(skt, useBackgroundTrafficClass);
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(void) useBackgroundTrafficClass;
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// All the socket setup has already been done
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err = listen(skt, NUM_PROXY_TCP_CONNS);
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if (err)
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{
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LogMsg("SetupTCPProxySocket: listen %d errno %d (%s)", skt, errno, strerror(errno));
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return err;
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}
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fcntl(skt, F_SETFL, fcntl(skt, F_GETFL, 0) | O_NONBLOCK); // set non-blocking
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*s = skt;
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k->KQcallback = ProxyTCPAccept;
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k->KQcontext = cp;
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k->KQtask = "TCP Accept";
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#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
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k->readSource = mDNSNULL;
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k->writeSource = mDNSNULL;
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k->fdClosed = mDNSfalse;
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#endif
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KQueueSet(*s, EV_ADD, EVFILT_READ, k);
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return mStatus_NoError;
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}
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mDNSlocal void BindDPSocket(int fd, int sa_family)
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{
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int err;
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const int on = 1;
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if (sa_family == AF_INET)
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{
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struct sockaddr_in addr;
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err = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on));
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if (err < 0)
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LogMsg("BindDPSocket: setsockopt SO_REUSEPORT failed for IPv4 %d errno %d (%s)", fd, errno, strerror(errno));
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(53);
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err = bind(fd, (struct sockaddr*) &addr, sizeof(addr));
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if (err)
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{
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LogMsg("BindDPSocket: bind %d errno %d (%s)", fd, errno, strerror(errno));
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return;
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}
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}
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else
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{
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struct sockaddr_in6 addr6;
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// We want to receive only IPv6 packets. Without this option we get IPv4 packets too,
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// with mapped addresses of the form 0:0:0:0:0:FFFF:xxxx:xxxx, where xxxx:xxxx is the IPv4 address
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err = setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
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if (err < 0)
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{
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LogMsg("DPFBindSocket: setsockopt IPV6_V6ONLY %d errno %d (%s)", fd, errno, strerror(errno));
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return;
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}
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err = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on));
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if (err < 0)
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LogMsg("BindDPSocket: setsockopt SO_REUSEPORT failed for V6 %d errno %d (%s)", fd, errno, strerror(errno));
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memset(&addr6, 0, sizeof(addr6));
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addr6.sin6_family = AF_INET6;
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addr6.sin6_port = htons(53);
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err = bind(fd, (struct sockaddr*) &addr6, sizeof(addr6));
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if (err)
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{
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LogMsg("BindDPSocket: bind6 %d errno %d (%s)", fd, errno, strerror(errno));
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return;
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}
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}
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}
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// Setup DNS Proxy Skts in main kevent loop and set the skt options
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mDNSlocal void SetupDNSProxySkts(int fd[4])
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{
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mDNS *const m = &mDNSStorage;
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int i;
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mStatus err;
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KQSocketSet *udpSS;
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KQSocketSet *tcpSS;
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udpSS = &m->p->UDPProxy.ss;
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tcpSS = &m->p->TCPProxy.ss;
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udpSS->port = UnicastDNSPort;
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tcpSS->port = UnicastDNSPort;
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LogMsg("SetupDNSProxySkts: %d, %d, %d, %d", fd[0], fd[1], fd[2], fd[3]);
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// myKQSocketCallBack checks for proxy and calls the m->p->ProxyCallback instead of mDNSCoreReceive
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udpSS->proxy = mDNStrue;
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err = SetupUDPProxySocket(fd[0], udpSS, AF_INET, mDNSfalse);
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if (err)
|
|
LogMsg("SetupDNSProxySkts: ERROR!! UDPv4 Socket");
|
|
|
|
err = SetupUDPProxySocket(fd[1], udpSS, AF_INET6, mDNSfalse);
|
|
if (err)
|
|
LogMsg("SetupDNSProxySkts: ERROR!! UDPv6 Socket");
|
|
|
|
err = SetupTCPProxySocket(fd[2], tcpSS, AF_INET, mDNSfalse);
|
|
if (err)
|
|
LogMsg("SetupDNSProxySkts: ERROR!! TCPv4 Socket");
|
|
|
|
err = SetupTCPProxySocket(fd[3], tcpSS, AF_INET6, mDNSfalse);
|
|
if (err)
|
|
LogMsg("SetupDNSProxySkts: ERROR!! TCPv6 Socket");
|
|
|
|
for (i = 0; i < 4; i++)
|
|
dp_listener[i] = fd[i];
|
|
}
|
|
|
|
// Create and bind the DNS Proxy Skts for use
|
|
mDNSexport void mDNSPlatformInitDNSProxySkts(ProxyCallback UDPCallback, ProxyCallback TCPCallback)
|
|
{
|
|
int dpskt[4];
|
|
|
|
dpskt[0] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
dpskt[1] = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
|
|
dpskt[2] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
dpskt[3] = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
|
|
|
|
// Close all DNS Proxy skts in case any of them are invalid
|
|
if (!ValidSocket(dpskt[0]) || !ValidSocket(dpskt[1]) ||
|
|
!ValidSocket(dpskt[2]) || !ValidSocket(dpskt[3]))
|
|
{
|
|
if (ValidSocket(dpskt[0]))
|
|
close(dpskt[0]);
|
|
if (ValidSocket(dpskt[1]))
|
|
close(dpskt[1]);
|
|
if (ValidSocket(dpskt[2]))
|
|
close(dpskt[2]);
|
|
if (ValidSocket(dpskt[3]))
|
|
close(dpskt[3]);
|
|
}
|
|
|
|
BindDPSocket(dpskt[0], AF_INET);
|
|
BindDPSocket(dpskt[1], AF_INET6);
|
|
BindDPSocket(dpskt[2], AF_INET);
|
|
BindDPSocket(dpskt[3], AF_INET6);
|
|
|
|
LogInfo("mDNSPlatformInitDNSProxySkts: Opened Listener Sockets for DNS Proxy : %d, %d, %d, %d",
|
|
dpskt[0], dpskt[1], dpskt[2], dpskt[3]);
|
|
|
|
mDNSStorage.p->UDPProxyCallback = UDPCallback;
|
|
mDNSStorage.p->TCPProxyCallback = TCPCallback;
|
|
|
|
SetupDNSProxySkts(dpskt);
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformCloseDNSProxySkts(mDNS *const m)
|
|
{
|
|
(void) m;
|
|
int i;
|
|
for (i = 0; i < 4; i++)
|
|
close(dp_listener[i]);
|
|
LogInfo("mDNSPlatformCloseDNSProxySkts: Closing DNS Proxy Listener Sockets");
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformDisposeProxyContext(void *context)
|
|
{
|
|
ProxyTCPInfo_t *ti;
|
|
TCPSocket *sock;
|
|
KQSocketSet *kq;
|
|
|
|
if (!context)
|
|
return;
|
|
|
|
ti = (ProxyTCPInfo_t *)context;
|
|
sock = &ti->sock;
|
|
|
|
kq = &sock->ss;
|
|
if (kq->sktv4 != -1)
|
|
{
|
|
shutdown(kq->sktv4, 2);
|
|
mDNSPlatformCloseFD(&kq->kqsv4, kq->sktv4);
|
|
}
|
|
if (kq->sktv6 != -1)
|
|
{
|
|
shutdown(kq->sktv6, 2);
|
|
mDNSPlatformCloseFD(&kq->kqsv6, kq->sktv6);
|
|
}
|
|
if (kq->closeFlag)
|
|
*kq->closeFlag = 1;
|
|
|
|
if (ti->reply)
|
|
freeL("ProxyTCPInfoLen", ti->reply);
|
|
freeL("ProxyTCPContext", ti);
|
|
}
|
|
|