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1682 lines
54 KiB
1682 lines
54 KiB
/* -*- Mode: C; tab-width: 4 -*-
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*
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* Copyright (c) 2002-2004 Apple Computer, 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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* Formatting notes:
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* This code follows the "Whitesmiths style" C indentation rules. Plenty of discussion
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* on C indentation can be found on the web, such as <http://www.kafejo.com/komp/1tbs.htm>,
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* but for the sake of brevity here I will say just this: Curly braces are not syntactially
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* part of an "if" statement; they are the beginning and ending markers of a compound statement;
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* therefore common sense dictates that if they are part of a compound statement then they
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* should be indented to the same level as everything else in that compound statement.
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* Indenting curly braces at the same level as the "if" implies that curly braces are
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* part of the "if", which is false. (This is as misleading as people who write "char* x,y;"
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* thinking that variables x and y are both of type "char*" -- and anyone who doesn't
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* understand why variable y is not of type "char*" just proves the point that poor code
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* layout leads people to unfortunate misunderstandings about how the C language really works.)
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*/
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#include "mDNSEmbeddedAPI.h" // Defines the interface provided to the client layer above
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#include "DNSCommon.h"
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#include "mDNSPosix.h" // Defines the specific types needed to run mDNS on this platform
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#include "dns_sd.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef __ANDROID__
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#include <syslog.h>
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#endif
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#include <stdarg.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/select.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <time.h> // platform support for UTC time
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#if USES_NETLINK
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#include <asm/types.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#else // USES_NETLINK
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#include <net/route.h>
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#include <net/if.h>
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#endif // USES_NETLINK
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#include "mDNSUNP.h"
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#include "GenLinkedList.h"
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// Disallow SO_REUSEPORT on Android because we use >3.9 kernel headers to build binaries targeted to 3.4.x.
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#ifdef __ANDROID__
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#undef SO_REUSEPORT
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#endif
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// __ANDROID__ : replaced assert(close(..)) at several points in this file.
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// ***************************************************************************
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// Structures
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// We keep a list of client-supplied event sources in PosixEventSource records
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struct PosixEventSource
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{
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mDNSPosixEventCallback Callback;
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void *Context;
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int fd;
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struct PosixEventSource *Next;
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};
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typedef struct PosixEventSource PosixEventSource;
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// Context record for interface change callback
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struct IfChangeRec
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{
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int NotifySD;
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mDNS *mDNS;
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};
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typedef struct IfChangeRec IfChangeRec;
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// Note that static data is initialized to zero in (modern) C.
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static fd_set gEventFDs;
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static int gMaxFD; // largest fd in gEventFDs
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static GenLinkedList gEventSources; // linked list of PosixEventSource's
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static sigset_t gEventSignalSet; // Signals which event loop listens for
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static sigset_t gEventSignals; // Signals which were received while inside loop
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// ***************************************************************************
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// Globals (for debugging)
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static int num_registered_interfaces = 0;
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static int num_pkts_accepted = 0;
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static int num_pkts_rejected = 0;
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// ***************************************************************************
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// Functions
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int gMDNSPlatformPosixVerboseLevel = 0;
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#define PosixErrorToStatus(errNum) ((errNum) == 0 ? mStatus_NoError : mStatus_UnknownErr)
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mDNSlocal void SockAddrTomDNSAddr(const struct sockaddr *const sa, mDNSAddr *ipAddr, mDNSIPPort *ipPort)
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{
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switch (sa->sa_family)
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{
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case AF_INET:
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{
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struct sockaddr_in *sin = (struct sockaddr_in*)sa;
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ipAddr->type = mDNSAddrType_IPv4;
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ipAddr->ip.v4.NotAnInteger = sin->sin_addr.s_addr;
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if (ipPort) ipPort->NotAnInteger = sin->sin_port;
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break;
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}
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#if HAVE_IPV6
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case AF_INET6:
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
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#ifndef NOT_HAVE_SA_LEN
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assert(sin6->sin6_len == sizeof(*sin6));
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#endif
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ipAddr->type = mDNSAddrType_IPv6;
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ipAddr->ip.v6 = *(mDNSv6Addr*)&sin6->sin6_addr;
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if (ipPort) ipPort->NotAnInteger = sin6->sin6_port;
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break;
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}
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#endif
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default:
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verbosedebugf("SockAddrTomDNSAddr: Uknown address family %d\n", sa->sa_family);
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ipAddr->type = mDNSAddrType_None;
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if (ipPort) ipPort->NotAnInteger = 0;
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break;
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}
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}
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#if COMPILER_LIKES_PRAGMA_MARK
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#pragma mark ***** Send and Receive
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#endif
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// mDNS core calls this routine when it needs to send a packet.
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mDNSexport mStatus mDNSPlatformSendUDP(const mDNS *const m, const void *const msg, const mDNSu8 *const end,
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mDNSInterfaceID InterfaceID, UDPSocket *src, const mDNSAddr *dst, mDNSIPPort dstPort)
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{
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int err = 0;
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struct sockaddr_storage to;
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PosixNetworkInterface * thisIntf = (PosixNetworkInterface *)(InterfaceID);
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int sendingsocket = -1;
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(void)src; // Will need to use this parameter once we implement mDNSPlatformUDPSocket/mDNSPlatformUDPClose
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assert(m != NULL);
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assert(msg != NULL);
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assert(end != NULL);
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assert((((char *) end) - ((char *) msg)) > 0);
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if (dstPort.NotAnInteger == 0)
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{
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LogMsg("mDNSPlatformSendUDP: Invalid argument -dstPort is set to 0");
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return PosixErrorToStatus(EINVAL);
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}
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if (dst->type == mDNSAddrType_IPv4)
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{
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struct sockaddr_in *sin = (struct sockaddr_in*)&to;
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#ifndef NOT_HAVE_SA_LEN
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sin->sin_len = sizeof(*sin);
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#endif
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sin->sin_family = AF_INET;
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sin->sin_port = dstPort.NotAnInteger;
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sin->sin_addr.s_addr = dst->ip.v4.NotAnInteger;
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sendingsocket = thisIntf ? thisIntf->multicastSocket4 : m->p->unicastSocket4;
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}
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#if HAVE_IPV6
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else if (dst->type == mDNSAddrType_IPv6)
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&to;
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mDNSPlatformMemZero(sin6, sizeof(*sin6));
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#ifndef NOT_HAVE_SA_LEN
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sin6->sin6_len = sizeof(*sin6);
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#endif
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = dstPort.NotAnInteger;
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sin6->sin6_addr = *(struct in6_addr*)&dst->ip.v6;
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sendingsocket = thisIntf ? thisIntf->multicastSocket6 : m->p->unicastSocket6;
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}
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#endif
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if (sendingsocket >= 0)
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err = sendto(sendingsocket, msg, (char*)end - (char*)msg, 0, (struct sockaddr *)&to, GET_SA_LEN(to));
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if (err > 0) err = 0;
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else if (err < 0)
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{
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static int MessageCount = 0;
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// Don't report EHOSTDOWN (i.e. ARP failure), ENETDOWN, or no route to host for unicast destinations
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if (!mDNSAddressIsAllDNSLinkGroup(dst))
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if (errno == EHOSTDOWN || errno == ENETDOWN || errno == EHOSTUNREACH || errno == ENETUNREACH) return(mStatus_TransientErr);
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if (MessageCount < 1000)
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{
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MessageCount++;
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if (thisIntf)
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LogMsg("mDNSPlatformSendUDP got error %d (%s) sending packet to %#a on interface %#a/%s/%d",
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errno, strerror(errno), dst, &thisIntf->coreIntf.ip, thisIntf->intfName, thisIntf->index);
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else
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LogMsg("mDNSPlatformSendUDP got error %d (%s) sending packet to %#a", errno, strerror(errno), dst);
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}
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}
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return PosixErrorToStatus(err);
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}
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// This routine is called when the main loop detects that data is available on a socket.
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mDNSlocal void SocketDataReady(mDNS *const m, PosixNetworkInterface *intf, int skt)
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{
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mDNSAddr senderAddr, destAddr;
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mDNSIPPort senderPort;
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ssize_t packetLen;
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DNSMessage packet;
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struct my_in_pktinfo packetInfo;
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struct sockaddr_storage from;
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socklen_t fromLen;
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int flags;
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mDNSu8 ttl;
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mDNSBool reject;
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const mDNSInterfaceID InterfaceID = intf ? intf->coreIntf.InterfaceID : NULL;
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assert(m != NULL);
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assert(skt >= 0);
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fromLen = sizeof(from);
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flags = 0;
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packetLen = recvfrom_flags(skt, &packet, sizeof(packet), &flags, (struct sockaddr *) &from, &fromLen, &packetInfo, &ttl);
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if (packetLen >= 0)
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{
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SockAddrTomDNSAddr((struct sockaddr*)&from, &senderAddr, &senderPort);
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SockAddrTomDNSAddr((struct sockaddr*)&packetInfo.ipi_addr, &destAddr, NULL);
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// If we have broken IP_RECVDSTADDR functionality (so far
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// I've only seen this on OpenBSD) then apply a hack to
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// convince mDNS Core that this isn't a spoof packet.
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// Basically what we do is check to see whether the
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// packet arrived as a multicast and, if so, set its
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// destAddr to the mDNS address.
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//
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// I must admit that I could just be doing something
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// wrong on OpenBSD and hence triggering this problem
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// but I'm at a loss as to how.
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//
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// If this platform doesn't have IP_PKTINFO or IP_RECVDSTADDR, then we have
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// no way to tell the destination address or interface this packet arrived on,
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// so all we can do is just assume it's a multicast
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#if HAVE_BROKEN_RECVDSTADDR || (!defined(IP_PKTINFO) && !defined(IP_RECVDSTADDR))
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if ((destAddr.NotAnInteger == 0) && (flags & MSG_MCAST))
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{
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destAddr.type = senderAddr.type;
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if (senderAddr.type == mDNSAddrType_IPv4) destAddr.ip.v4 = AllDNSLinkGroup_v4.ip.v4;
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else if (senderAddr.type == mDNSAddrType_IPv6) destAddr.ip.v6 = AllDNSLinkGroup_v6.ip.v6;
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}
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#endif
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// We only accept the packet if the interface on which it came
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// in matches the interface associated with this socket.
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// We do this match by name or by index, depending on which
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// information is available. recvfrom_flags sets the name
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// to "" if the name isn't available, or the index to -1
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// if the index is available. This accomodates the various
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// different capabilities of our target platforms.
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reject = mDNSfalse;
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if (!intf)
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{
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// Ignore multicasts accidentally delivered to our unicast receiving socket
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if (mDNSAddrIsDNSMulticast(&destAddr)) packetLen = -1;
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}
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else
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{
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if (packetInfo.ipi_ifname[0] != 0) reject = (strcmp(packetInfo.ipi_ifname, intf->intfName) != 0);
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else if (packetInfo.ipi_ifindex != -1) reject = (packetInfo.ipi_ifindex != intf->index);
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if (reject)
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{
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verbosedebugf("SocketDataReady ignored a packet from %#a to %#a on interface %s/%d expecting %#a/%s/%d/%d",
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&senderAddr, &destAddr, packetInfo.ipi_ifname, packetInfo.ipi_ifindex,
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&intf->coreIntf.ip, intf->intfName, intf->index, skt);
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packetLen = -1;
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num_pkts_rejected++;
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if (num_pkts_rejected > (num_pkts_accepted + 1) * (num_registered_interfaces + 1) * 2)
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{
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fprintf(stderr,
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"*** WARNING: Received %d packets; Accepted %d packets; Rejected %d packets because of interface mismatch\n",
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num_pkts_accepted + num_pkts_rejected, num_pkts_accepted, num_pkts_rejected);
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num_pkts_accepted = 0;
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num_pkts_rejected = 0;
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}
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}
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else
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{
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verbosedebugf("SocketDataReady got a packet from %#a to %#a on interface %#a/%s/%d/%d",
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&senderAddr, &destAddr, &intf->coreIntf.ip, intf->intfName, intf->index, skt);
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num_pkts_accepted++;
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}
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}
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}
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if (packetLen >= 0)
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mDNSCoreReceive(m, &packet, (mDNSu8 *)&packet + packetLen,
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&senderAddr, senderPort, &destAddr, MulticastDNSPort, InterfaceID);
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}
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mDNSexport TCPSocket *mDNSPlatformTCPSocket(mDNS * const m, TCPSocketFlags flags, mDNSIPPort * port)
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{
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(void)m; // Unused
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(void)flags; // Unused
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(void)port; // Unused
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return NULL;
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}
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mDNSexport TCPSocket *mDNSPlatformTCPAccept(TCPSocketFlags flags, int sd)
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{
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(void)flags; // Unused
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(void)sd; // Unused
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return NULL;
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}
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mDNSexport int mDNSPlatformTCPGetFD(TCPSocket *sock)
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{
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(void)sock; // Unused
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return -1;
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}
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mDNSexport mStatus mDNSPlatformTCPConnect(TCPSocket *sock, const mDNSAddr *dst, mDNSOpaque16 dstport, domainname *hostname, mDNSInterfaceID InterfaceID,
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TCPConnectionCallback callback, void *context)
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{
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(void)sock; // Unused
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(void)dst; // Unused
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(void)dstport; // Unused
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(void)hostname; // Unused
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(void)InterfaceID; // Unused
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(void)callback; // Unused
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(void)context; // Unused
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return(mStatus_UnsupportedErr);
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}
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mDNSexport void mDNSPlatformTCPCloseConnection(TCPSocket *sock)
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{
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(void)sock; // Unused
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}
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mDNSexport long mDNSPlatformReadTCP(TCPSocket *sock, void *buf, unsigned long buflen, mDNSBool * closed)
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{
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(void)sock; // Unused
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(void)buf; // Unused
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(void)buflen; // Unused
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(void)closed; // Unused
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return 0;
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}
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mDNSexport long mDNSPlatformWriteTCP(TCPSocket *sock, const char *msg, unsigned long len)
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|
{
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(void)sock; // Unused
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(void)msg; // Unused
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(void)len; // Unused
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return 0;
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}
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mDNSexport UDPSocket *mDNSPlatformUDPSocket(mDNS * const m, mDNSIPPort port)
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|
{
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(void)m; // Unused
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(void)port; // Unused
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return NULL;
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|
}
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mDNSexport void mDNSPlatformUDPClose(UDPSocket *sock)
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{
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(void)sock; // Unused
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformUpdateProxyList(mDNS *const m, const mDNSInterfaceID InterfaceID)
|
|
{
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(void)m; // Unused
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(void)InterfaceID; // Unused
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformSendRawPacket(const void *const msg, const mDNSu8 *const end, mDNSInterfaceID InterfaceID)
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|
{
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|
(void)msg; // Unused
|
|
(void)end; // Unused
|
|
(void)InterfaceID; // Unused
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformSetLocalAddressCacheEntry(mDNS *const m, const mDNSAddr *const tpa, const mDNSEthAddr *const tha, mDNSInterfaceID InterfaceID)
|
|
{
|
|
(void)m; // Unused
|
|
(void)tpa; // Unused
|
|
(void)tha; // Unused
|
|
(void)InterfaceID; // Unused
|
|
}
|
|
|
|
mDNSexport mStatus mDNSPlatformTLSSetupCerts(void)
|
|
{
|
|
return(mStatus_UnsupportedErr);
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformTLSTearDownCerts(void)
|
|
{
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformSetAllowSleep(mDNS *const m, mDNSBool allowSleep, const char *reason)
|
|
{
|
|
(void) m;
|
|
(void) allowSleep;
|
|
(void) reason;
|
|
}
|
|
|
|
#if COMPILER_LIKES_PRAGMA_MARK
|
|
#pragma mark -
|
|
#pragma mark - /etc/hosts support
|
|
#endif
|
|
|
|
mDNSexport void FreeEtcHosts(mDNS *const m, AuthRecord *const rr, mStatus result)
|
|
{
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|
(void)m; // unused
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|
(void)rr;
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|
(void)result;
|
|
}
|
|
|
|
|
|
#if COMPILER_LIKES_PRAGMA_MARK
|
|
#pragma mark ***** DDNS Config Platform Functions
|
|
#endif
|
|
|
|
mDNSexport void mDNSPlatformSetDNSConfig(mDNS *const m, mDNSBool setservers, mDNSBool setsearch, domainname *const fqdn, DNameListElem **RegDomains, DNameListElem **BrowseDomains)
|
|
{
|
|
(void) m;
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|
(void) setservers;
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|
(void) fqdn;
|
|
(void) setsearch;
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|
(void) RegDomains;
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|
(void) BrowseDomains;
|
|
}
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|
|
|
mDNSexport mStatus mDNSPlatformGetPrimaryInterface(mDNS * const m, mDNSAddr * v4, mDNSAddr * v6, mDNSAddr * router)
|
|
{
|
|
(void) m;
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|
(void) v4;
|
|
(void) v6;
|
|
(void) router;
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|
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return mStatus_UnsupportedErr;
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformDynDNSHostNameStatusChanged(const domainname *const dname, const mStatus status)
|
|
{
|
|
(void) dname;
|
|
(void) status;
|
|
}
|
|
|
|
#if COMPILER_LIKES_PRAGMA_MARK
|
|
#pragma mark ***** Init and Term
|
|
#endif
|
|
|
|
// This gets the current hostname, truncating it at the first dot if necessary
|
|
mDNSlocal void GetUserSpecifiedRFC1034ComputerName(domainlabel *const namelabel)
|
|
{
|
|
int len = 0;
|
|
#ifndef __ANDROID__
|
|
gethostname((char *)(&namelabel->c[1]), MAX_DOMAIN_LABEL);
|
|
#else
|
|
// use an appropriate default label rather than the linux default of 'localhost'
|
|
strncpy(&namelabel->c[1], "Android", MAX_DOMAIN_LABEL);
|
|
#endif
|
|
while (len < MAX_DOMAIN_LABEL && namelabel->c[len+1] && namelabel->c[len+1] != '.') len++;
|
|
namelabel->c[0] = len;
|
|
}
|
|
|
|
// On OS X this gets the text of the field labelled "Computer Name" in the Sharing Prefs Control Panel
|
|
// Other platforms can either get the information from the appropriate place,
|
|
// or they can alternatively just require all registering services to provide an explicit name
|
|
mDNSlocal void GetUserSpecifiedFriendlyComputerName(domainlabel *const namelabel)
|
|
{
|
|
// On Unix we have no better name than the host name, so we just use that.
|
|
GetUserSpecifiedRFC1034ComputerName(namelabel);
|
|
}
|
|
|
|
mDNSexport int ParseDNSServers(mDNS *m, const char *filePath)
|
|
{
|
|
char line[256];
|
|
char nameserver[16];
|
|
char keyword[10];
|
|
int numOfServers = 0;
|
|
FILE *fp = fopen(filePath, "r");
|
|
if (fp == NULL) return -1;
|
|
while (fgets(line,sizeof(line),fp))
|
|
{
|
|
struct in_addr ina;
|
|
line[255]='\0'; // just to be safe
|
|
if (sscanf(line,"%10s %15s", keyword, nameserver) != 2) continue; // it will skip whitespaces
|
|
if (strncasecmp(keyword,"nameserver",10)) continue;
|
|
if (inet_aton(nameserver, (struct in_addr *)&ina) != 0)
|
|
{
|
|
mDNSAddr DNSAddr;
|
|
DNSAddr.type = mDNSAddrType_IPv4;
|
|
DNSAddr.ip.v4.NotAnInteger = ina.s_addr;
|
|
mDNS_AddDNSServer(m, NULL, mDNSInterface_Any, &DNSAddr, UnicastDNSPort, mDNSfalse, 0);
|
|
numOfServers++;
|
|
}
|
|
}
|
|
// __ANDROID__ : if fp was opened, it needs to be closed
|
|
int fp_closed = fclose(fp);
|
|
assert(fp_closed == 0);
|
|
return (numOfServers > 0) ? 0 : -1;
|
|
}
|
|
|
|
// Searches the interface list looking for the named interface.
|
|
// Returns a pointer to if it found, or NULL otherwise.
|
|
mDNSlocal PosixNetworkInterface *SearchForInterfaceByName(mDNS *const m, const char *intfName)
|
|
{
|
|
PosixNetworkInterface *intf;
|
|
|
|
assert(m != NULL);
|
|
assert(intfName != NULL);
|
|
|
|
intf = (PosixNetworkInterface*)(m->HostInterfaces);
|
|
while ((intf != NULL) && (strcmp(intf->intfName, intfName) != 0))
|
|
intf = (PosixNetworkInterface *)(intf->coreIntf.next);
|
|
|
|
return intf;
|
|
}
|
|
|
|
mDNSexport mDNSInterfaceID mDNSPlatformInterfaceIDfromInterfaceIndex(mDNS *const m, mDNSu32 index)
|
|
{
|
|
PosixNetworkInterface *intf;
|
|
|
|
assert(m != NULL);
|
|
|
|
if (index == kDNSServiceInterfaceIndexLocalOnly) return(mDNSInterface_LocalOnly);
|
|
if (index == kDNSServiceInterfaceIndexP2P ) return(mDNSInterface_P2P);
|
|
if (index == kDNSServiceInterfaceIndexAny ) return(mDNSInterface_Any);
|
|
|
|
intf = (PosixNetworkInterface*)(m->HostInterfaces);
|
|
while ((intf != NULL) && (mDNSu32) intf->index != index)
|
|
intf = (PosixNetworkInterface *)(intf->coreIntf.next);
|
|
|
|
return (mDNSInterfaceID) intf;
|
|
}
|
|
|
|
mDNSexport mDNSu32 mDNSPlatformInterfaceIndexfromInterfaceID(mDNS *const m, mDNSInterfaceID id, mDNSBool suppressNetworkChange)
|
|
{
|
|
PosixNetworkInterface *intf;
|
|
(void) suppressNetworkChange; // Unused
|
|
|
|
assert(m != NULL);
|
|
|
|
if (id == mDNSInterface_LocalOnly) return(kDNSServiceInterfaceIndexLocalOnly);
|
|
if (id == mDNSInterface_P2P ) return(kDNSServiceInterfaceIndexP2P);
|
|
if (id == mDNSInterface_Any ) return(kDNSServiceInterfaceIndexAny);
|
|
|
|
intf = (PosixNetworkInterface*)(m->HostInterfaces);
|
|
while ((intf != NULL) && (mDNSInterfaceID) intf != id)
|
|
intf = (PosixNetworkInterface *)(intf->coreIntf.next);
|
|
|
|
return intf ? intf->index : 0;
|
|
}
|
|
|
|
// Frees the specified PosixNetworkInterface structure. The underlying
|
|
// interface must have already been deregistered with the mDNS core.
|
|
mDNSlocal void FreePosixNetworkInterface(PosixNetworkInterface *intf)
|
|
{
|
|
assert(intf != NULL);
|
|
if (intf->intfName != NULL) free((void *)intf->intfName);
|
|
if (intf->multicastSocket4 != -1)
|
|
{
|
|
int ipv4_closed = close(intf->multicastSocket4);
|
|
assert(ipv4_closed == 0);
|
|
}
|
|
#if HAVE_IPV6
|
|
if (intf->multicastSocket6 != -1)
|
|
{
|
|
int ipv6_closed = close(intf->multicastSocket6);
|
|
assert(ipv6_closed == 0);
|
|
}
|
|
#endif
|
|
free(intf);
|
|
}
|
|
|
|
// Grab the first interface, deregister it, free it, and repeat until done.
|
|
mDNSlocal void ClearInterfaceList(mDNS *const m)
|
|
{
|
|
assert(m != NULL);
|
|
|
|
while (m->HostInterfaces)
|
|
{
|
|
PosixNetworkInterface *intf = (PosixNetworkInterface*)(m->HostInterfaces);
|
|
mDNS_DeregisterInterface(m, &intf->coreIntf, mDNSfalse);
|
|
if (gMDNSPlatformPosixVerboseLevel > 0) fprintf(stderr, "Deregistered interface %s\n", intf->intfName);
|
|
FreePosixNetworkInterface(intf);
|
|
}
|
|
num_registered_interfaces = 0;
|
|
num_pkts_accepted = 0;
|
|
num_pkts_rejected = 0;
|
|
}
|
|
|
|
// Sets up a send/receive socket.
|
|
// If mDNSIPPort port is non-zero, then it's a multicast socket on the specified interface
|
|
// If mDNSIPPort port is zero, then it's a randomly assigned port number, used for sending unicast queries
|
|
mDNSlocal int SetupSocket(struct sockaddr *intfAddr, mDNSIPPort port, int interfaceIndex, int *sktPtr)
|
|
{
|
|
int err = 0;
|
|
static const int kOn = 1;
|
|
static const int kIntTwoFiveFive = 255;
|
|
static const unsigned char kByteTwoFiveFive = 255;
|
|
const mDNSBool JoinMulticastGroup = (port.NotAnInteger != 0);
|
|
|
|
(void) interfaceIndex; // This parameter unused on plaforms that don't have IPv6
|
|
assert(intfAddr != NULL);
|
|
assert(sktPtr != NULL);
|
|
assert(*sktPtr == -1);
|
|
|
|
// Open the socket...
|
|
if (intfAddr->sa_family == AF_INET) *sktPtr = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
#if HAVE_IPV6
|
|
else if (intfAddr->sa_family == AF_INET6) *sktPtr = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
|
|
#endif
|
|
else return EINVAL;
|
|
|
|
if (*sktPtr < 0) { err = errno; perror((intfAddr->sa_family == AF_INET) ? "socket AF_INET" : "socket AF_INET6"); }
|
|
|
|
// ... with a shared UDP port, if it's for multicast receiving
|
|
if (err == 0 && port.NotAnInteger)
|
|
{
|
|
#if defined(SO_REUSEPORT)
|
|
err = setsockopt(*sktPtr, SOL_SOCKET, SO_REUSEPORT, &kOn, sizeof(kOn));
|
|
#elif defined(SO_REUSEADDR)
|
|
err = setsockopt(*sktPtr, SOL_SOCKET, SO_REUSEADDR, &kOn, sizeof(kOn));
|
|
#else
|
|
#error This platform has no way to avoid address busy errors on multicast.
|
|
#endif
|
|
if (err < 0) { err = errno; perror("setsockopt - SO_REUSExxxx"); }
|
|
}
|
|
|
|
// We want to receive destination addresses and interface identifiers.
|
|
if (intfAddr->sa_family == AF_INET)
|
|
{
|
|
struct ip_mreq imr;
|
|
struct sockaddr_in bindAddr;
|
|
if (err == 0)
|
|
{
|
|
#if defined(IP_PKTINFO) // Linux
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_PKTINFO, &kOn, sizeof(kOn));
|
|
if (err < 0) { err = errno; perror("setsockopt - IP_PKTINFO"); }
|
|
#elif defined(IP_RECVDSTADDR) || defined(IP_RECVIF) // BSD and Solaris
|
|
#if defined(IP_RECVDSTADDR)
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_RECVDSTADDR, &kOn, sizeof(kOn));
|
|
if (err < 0) { err = errno; perror("setsockopt - IP_RECVDSTADDR"); }
|
|
#endif
|
|
#if defined(IP_RECVIF)
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_RECVIF, &kOn, sizeof(kOn));
|
|
if (err < 0) { err = errno; perror("setsockopt - IP_RECVIF"); }
|
|
}
|
|
#endif
|
|
#else
|
|
#warning This platform has no way to get the destination interface information -- will only work for single-homed hosts
|
|
#endif
|
|
}
|
|
#if defined(IP_RECVTTL) // Linux
|
|
if (err == 0)
|
|
{
|
|
setsockopt(*sktPtr, IPPROTO_IP, IP_RECVTTL, &kOn, sizeof(kOn));
|
|
// We no longer depend on being able to get the received TTL, so don't worry if the option fails
|
|
}
|
|
#endif
|
|
|
|
// Add multicast group membership on this interface
|
|
if (err == 0 && JoinMulticastGroup)
|
|
{
|
|
imr.imr_multiaddr.s_addr = AllDNSLinkGroup_v4.ip.v4.NotAnInteger;
|
|
imr.imr_interface = ((struct sockaddr_in*)intfAddr)->sin_addr;
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(imr));
|
|
if (err < 0) { err = errno; perror("setsockopt - IP_ADD_MEMBERSHIP"); }
|
|
}
|
|
|
|
// Specify outgoing interface too
|
|
if (err == 0 && JoinMulticastGroup)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_IF, &((struct sockaddr_in*)intfAddr)->sin_addr, sizeof(struct in_addr));
|
|
if (err < 0) { err = errno; perror("setsockopt - IP_MULTICAST_IF"); }
|
|
}
|
|
|
|
// Per the mDNS spec, send unicast packets with TTL 255
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_TTL, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
|
|
if (err < 0) { err = errno; perror("setsockopt - IP_TTL"); }
|
|
}
|
|
|
|
// and multicast packets with TTL 255 too
|
|
// There's some debate as to whether IP_MULTICAST_TTL is an int or a byte so we just try both.
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_TTL, &kByteTwoFiveFive, sizeof(kByteTwoFiveFive));
|
|
if (err < 0 && errno == EINVAL)
|
|
err = setsockopt(*sktPtr, IPPROTO_IP, IP_MULTICAST_TTL, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
|
|
if (err < 0) { err = errno; perror("setsockopt - IP_MULTICAST_TTL"); }
|
|
}
|
|
|
|
// And start listening for packets
|
|
if (err == 0)
|
|
{
|
|
bindAddr.sin_family = AF_INET;
|
|
bindAddr.sin_port = port.NotAnInteger;
|
|
bindAddr.sin_addr.s_addr = INADDR_ANY; // Want to receive multicasts AND unicasts on this socket
|
|
err = bind(*sktPtr, (struct sockaddr *) &bindAddr, sizeof(bindAddr));
|
|
if (err < 0) { err = errno; perror("bind"); fflush(stderr); }
|
|
}
|
|
} // endif (intfAddr->sa_family == AF_INET)
|
|
|
|
#if HAVE_IPV6
|
|
else if (intfAddr->sa_family == AF_INET6)
|
|
{
|
|
struct ipv6_mreq imr6;
|
|
struct sockaddr_in6 bindAddr6;
|
|
#if defined(IPV6_PKTINFO)
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_2292_PKTINFO, &kOn, sizeof(kOn));
|
|
if (err < 0) { err = errno; perror("setsockopt - IPV6_PKTINFO"); }
|
|
}
|
|
#else
|
|
#warning This platform has no way to get the destination interface information for IPv6 -- will only work for single-homed hosts
|
|
#endif
|
|
#if defined(IPV6_HOPLIMIT)
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_2292_HOPLIMIT, &kOn, sizeof(kOn));
|
|
if (err < 0) { err = errno; perror("setsockopt - IPV6_HOPLIMIT"); }
|
|
}
|
|
#endif
|
|
|
|
// Add multicast group membership on this interface
|
|
if (err == 0 && JoinMulticastGroup)
|
|
{
|
|
imr6.ipv6mr_multiaddr = *(const struct in6_addr*)&AllDNSLinkGroup_v6.ip.v6;
|
|
imr6.ipv6mr_interface = interfaceIndex;
|
|
//LogMsg("Joining %.16a on %d", &imr6.ipv6mr_multiaddr, imr6.ipv6mr_interface);
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_JOIN_GROUP, &imr6, sizeof(imr6));
|
|
if (err < 0)
|
|
{
|
|
err = errno;
|
|
verbosedebugf("IPV6_JOIN_GROUP %.16a on %d failed.\n", &imr6.ipv6mr_multiaddr, imr6.ipv6mr_interface);
|
|
perror("setsockopt - IPV6_JOIN_GROUP");
|
|
}
|
|
}
|
|
|
|
// Specify outgoing interface too
|
|
if (err == 0 && JoinMulticastGroup)
|
|
{
|
|
u_int multicast_if = interfaceIndex;
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_IF, &multicast_if, sizeof(multicast_if));
|
|
if (err < 0) { err = errno; perror("setsockopt - IPV6_MULTICAST_IF"); }
|
|
}
|
|
|
|
// We want to receive only IPv6 packets on this socket.
|
|
// Without this option, we may get IPv4 addresses as mapped addresses.
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_V6ONLY, &kOn, sizeof(kOn));
|
|
if (err < 0) { err = errno; perror("setsockopt - IPV6_V6ONLY"); }
|
|
}
|
|
|
|
// Per the mDNS spec, send unicast packets with TTL 255
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
|
|
if (err < 0) { err = errno; perror("setsockopt - IPV6_UNICAST_HOPS"); }
|
|
}
|
|
|
|
// and multicast packets with TTL 255 too
|
|
// There's some debate as to whether IPV6_MULTICAST_HOPS is an int or a byte so we just try both.
|
|
if (err == 0)
|
|
{
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &kByteTwoFiveFive, sizeof(kByteTwoFiveFive));
|
|
if (err < 0 && errno == EINVAL)
|
|
err = setsockopt(*sktPtr, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &kIntTwoFiveFive, sizeof(kIntTwoFiveFive));
|
|
if (err < 0) { err = errno; perror("setsockopt - IPV6_MULTICAST_HOPS"); }
|
|
}
|
|
|
|
// And start listening for packets
|
|
if (err == 0)
|
|
{
|
|
mDNSPlatformMemZero(&bindAddr6, sizeof(bindAddr6));
|
|
#ifndef NOT_HAVE_SA_LEN
|
|
bindAddr6.sin6_len = sizeof(bindAddr6);
|
|
#endif
|
|
bindAddr6.sin6_family = AF_INET6;
|
|
bindAddr6.sin6_port = port.NotAnInteger;
|
|
bindAddr6.sin6_flowinfo = 0;
|
|
bindAddr6.sin6_addr = in6addr_any; // Want to receive multicasts AND unicasts on this socket
|
|
bindAddr6.sin6_scope_id = 0;
|
|
err = bind(*sktPtr, (struct sockaddr *) &bindAddr6, sizeof(bindAddr6));
|
|
if (err < 0) { err = errno; perror("bind"); fflush(stderr); }
|
|
}
|
|
} // endif (intfAddr->sa_family == AF_INET6)
|
|
#endif
|
|
|
|
// Set the socket to non-blocking.
|
|
if (err == 0)
|
|
{
|
|
err = fcntl(*sktPtr, F_GETFL, 0);
|
|
if (err < 0) err = errno;
|
|
else
|
|
{
|
|
err = fcntl(*sktPtr, F_SETFL, err | O_NONBLOCK);
|
|
if (err < 0) err = errno;
|
|
}
|
|
}
|
|
|
|
// Clean up
|
|
if (err != 0 && *sktPtr != -1)
|
|
{
|
|
int sktClosed = close(*sktPtr);
|
|
assert(sktClosed == 0);
|
|
*sktPtr = -1;
|
|
}
|
|
assert((err == 0) == (*sktPtr != -1));
|
|
return err;
|
|
}
|
|
|
|
// Creates a PosixNetworkInterface for the interface whose IP address is
|
|
// intfAddr and whose name is intfName and registers it with mDNS core.
|
|
mDNSlocal int SetupOneInterface(mDNS *const m, struct sockaddr *intfAddr, struct sockaddr *intfMask, const char *intfName, int intfIndex)
|
|
{
|
|
int err = 0;
|
|
PosixNetworkInterface *intf;
|
|
PosixNetworkInterface *alias = NULL;
|
|
|
|
assert(m != NULL);
|
|
assert(intfAddr != NULL);
|
|
assert(intfName != NULL);
|
|
assert(intfMask != NULL);
|
|
|
|
// Allocate the interface structure itself.
|
|
intf = (PosixNetworkInterface*)malloc(sizeof(*intf));
|
|
if (intf == NULL) { assert(0); err = ENOMEM; }
|
|
|
|
// And make a copy of the intfName.
|
|
if (err == 0)
|
|
{
|
|
intf->intfName = strdup(intfName);
|
|
if (intf->intfName == NULL) { assert(0); err = ENOMEM; }
|
|
}
|
|
|
|
if (err == 0)
|
|
{
|
|
// Set up the fields required by the mDNS core.
|
|
SockAddrTomDNSAddr(intfAddr, &intf->coreIntf.ip, NULL);
|
|
SockAddrTomDNSAddr(intfMask, &intf->coreIntf.mask, NULL);
|
|
|
|
//LogMsg("SetupOneInterface: %#a %#a", &intf->coreIntf.ip, &intf->coreIntf.mask);
|
|
strncpy(intf->coreIntf.ifname, intfName, sizeof(intf->coreIntf.ifname));
|
|
intf->coreIntf.ifname[sizeof(intf->coreIntf.ifname)-1] = 0;
|
|
intf->coreIntf.Advertise = m->AdvertiseLocalAddresses;
|
|
intf->coreIntf.McastTxRx = mDNStrue;
|
|
|
|
// Set up the extra fields in PosixNetworkInterface.
|
|
assert(intf->intfName != NULL); // intf->intfName already set up above
|
|
intf->index = intfIndex;
|
|
intf->multicastSocket4 = -1;
|
|
#if HAVE_IPV6
|
|
intf->multicastSocket6 = -1;
|
|
#endif
|
|
alias = SearchForInterfaceByName(m, intf->intfName);
|
|
if (alias == NULL) alias = intf;
|
|
intf->coreIntf.InterfaceID = (mDNSInterfaceID)alias;
|
|
|
|
if (alias != intf)
|
|
debugf("SetupOneInterface: %s %#a is an alias of %#a", intfName, &intf->coreIntf.ip, &alias->coreIntf.ip);
|
|
}
|
|
|
|
// Set up the multicast socket
|
|
if (err == 0)
|
|
{
|
|
if (alias->multicastSocket4 == -1 && intfAddr->sa_family == AF_INET)
|
|
err = SetupSocket(intfAddr, MulticastDNSPort, intf->index, &alias->multicastSocket4);
|
|
#if HAVE_IPV6
|
|
else if (alias->multicastSocket6 == -1 && intfAddr->sa_family == AF_INET6)
|
|
err = SetupSocket(intfAddr, MulticastDNSPort, intf->index, &alias->multicastSocket6);
|
|
#endif
|
|
}
|
|
|
|
// The interface is all ready to go, let's register it with the mDNS core.
|
|
if (err == 0)
|
|
err = mDNS_RegisterInterface(m, &intf->coreIntf, mDNSfalse);
|
|
|
|
// Clean up.
|
|
if (err == 0)
|
|
{
|
|
num_registered_interfaces++;
|
|
debugf("SetupOneInterface: %s %#a Registered", intf->intfName, &intf->coreIntf.ip);
|
|
if (gMDNSPlatformPosixVerboseLevel > 0)
|
|
fprintf(stderr, "Registered interface %s\n", intf->intfName);
|
|
}
|
|
else
|
|
{
|
|
// Use intfName instead of intf->intfName in the next line to avoid dereferencing NULL.
|
|
debugf("SetupOneInterface: %s %#a failed to register %d", intfName, &intf->coreIntf.ip, err);
|
|
if (intf) { FreePosixNetworkInterface(intf); intf = NULL; }
|
|
}
|
|
|
|
assert((err == 0) == (intf != NULL));
|
|
|
|
return err;
|
|
}
|
|
|
|
// Call get_ifi_info() to obtain a list of active interfaces and call SetupOneInterface() on each one.
|
|
mDNSlocal int SetupInterfaceList(mDNS *const m)
|
|
{
|
|
mDNSBool foundav4 = mDNSfalse;
|
|
int err = 0;
|
|
struct ifi_info *intfList = get_ifi_info(AF_INET, mDNStrue);
|
|
struct ifi_info *firstLoopback = NULL;
|
|
|
|
assert(m != NULL);
|
|
debugf("SetupInterfaceList");
|
|
|
|
if (intfList == NULL) err = ENOENT;
|
|
|
|
#if HAVE_IPV6
|
|
if (err == 0) /* Link the IPv6 list to the end of the IPv4 list */
|
|
{
|
|
struct ifi_info **p = &intfList;
|
|
while (*p) p = &(*p)->ifi_next;
|
|
*p = get_ifi_info(AF_INET6, mDNStrue);
|
|
}
|
|
#endif
|
|
|
|
if (err == 0)
|
|
{
|
|
struct ifi_info *i = intfList;
|
|
while (i)
|
|
{
|
|
if ( ((i->ifi_addr->sa_family == AF_INET)
|
|
#if HAVE_IPV6
|
|
|| (i->ifi_addr->sa_family == AF_INET6)
|
|
#endif
|
|
) && (i->ifi_flags & IFF_UP) && !(i->ifi_flags & IFF_POINTOPOINT))
|
|
{
|
|
if (i->ifi_flags & IFF_LOOPBACK)
|
|
{
|
|
if (firstLoopback == NULL)
|
|
firstLoopback = i;
|
|
}
|
|
else if (i->ifi_flags & (IFF_MULTICAST | IFF_BROADCAST)) // http://b/25669326
|
|
{
|
|
if (SetupOneInterface(m, i->ifi_addr, i->ifi_netmask, i->ifi_name, i->ifi_index) == 0)
|
|
if (i->ifi_addr->sa_family == AF_INET)
|
|
foundav4 = mDNStrue;
|
|
}
|
|
}
|
|
i = i->ifi_next;
|
|
}
|
|
|
|
// If we found no normal interfaces but we did find a loopback interface, register the
|
|
// loopback interface. This allows self-discovery if no interfaces are configured.
|
|
// Temporary workaround: Multicast loopback on IPv6 interfaces appears not to work.
|
|
// In the interim, we skip loopback interface only if we found at least one v4 interface to use
|
|
// if ((m->HostInterfaces == NULL) && (firstLoopback != NULL))
|
|
if (!foundav4 && firstLoopback)
|
|
(void) SetupOneInterface(m, firstLoopback->ifi_addr, firstLoopback->ifi_netmask, firstLoopback->ifi_name, firstLoopback->ifi_index);
|
|
}
|
|
|
|
// Clean up.
|
|
if (intfList != NULL) free_ifi_info(intfList);
|
|
return err;
|
|
}
|
|
|
|
#if USES_NETLINK
|
|
|
|
// See <http://www.faqs.org/rfcs/rfc3549.html> for a description of NetLink
|
|
|
|
// Open a socket that will receive interface change notifications
|
|
mDNSlocal mStatus OpenIfNotifySocket(int *pFD)
|
|
{
|
|
mStatus err = mStatus_NoError;
|
|
struct sockaddr_nl snl;
|
|
int sock;
|
|
int ret;
|
|
|
|
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
|
if (sock < 0)
|
|
return errno;
|
|
|
|
// Configure read to be non-blocking because inbound msg size is not known in advance
|
|
(void) fcntl(sock, F_SETFL, O_NONBLOCK);
|
|
|
|
/* Subscribe the socket to Link & IP addr notifications. */
|
|
mDNSPlatformMemZero(&snl, sizeof snl);
|
|
snl.nl_family = AF_NETLINK;
|
|
snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
|
|
ret = bind(sock, (struct sockaddr *) &snl, sizeof snl);
|
|
if (0 == ret)
|
|
*pFD = sock;
|
|
else
|
|
err = errno;
|
|
|
|
return err;
|
|
}
|
|
|
|
#if MDNS_DEBUGMSGS
|
|
mDNSlocal void PrintNetLinkMsg(const struct nlmsghdr *pNLMsg)
|
|
{
|
|
const char *kNLMsgTypes[] = { "", "NLMSG_NOOP", "NLMSG_ERROR", "NLMSG_DONE", "NLMSG_OVERRUN" };
|
|
const char *kNLRtMsgTypes[] = { "RTM_NEWLINK", "RTM_DELLINK", "RTM_GETLINK", "RTM_NEWADDR", "RTM_DELADDR", "RTM_GETADDR" };
|
|
|
|
printf("nlmsghdr len=%d, type=%s, flags=0x%x\n", pNLMsg->nlmsg_len,
|
|
pNLMsg->nlmsg_type < RTM_BASE ? kNLMsgTypes[pNLMsg->nlmsg_type] : kNLRtMsgTypes[pNLMsg->nlmsg_type - RTM_BASE],
|
|
pNLMsg->nlmsg_flags);
|
|
|
|
if (RTM_NEWLINK <= pNLMsg->nlmsg_type && pNLMsg->nlmsg_type <= RTM_GETLINK)
|
|
{
|
|
struct ifinfomsg *pIfInfo = (struct ifinfomsg*) NLMSG_DATA(pNLMsg);
|
|
printf("ifinfomsg family=%d, type=%d, index=%d, flags=0x%x, change=0x%x\n", pIfInfo->ifi_family,
|
|
pIfInfo->ifi_type, pIfInfo->ifi_index, pIfInfo->ifi_flags, pIfInfo->ifi_change);
|
|
|
|
}
|
|
else if (RTM_NEWADDR <= pNLMsg->nlmsg_type && pNLMsg->nlmsg_type <= RTM_GETADDR)
|
|
{
|
|
struct ifaddrmsg *pIfAddr = (struct ifaddrmsg*) NLMSG_DATA(pNLMsg);
|
|
printf("ifaddrmsg family=%d, index=%d, flags=0x%x\n", pIfAddr->ifa_family,
|
|
pIfAddr->ifa_index, pIfAddr->ifa_flags);
|
|
}
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
mDNSlocal mDNSu32 ProcessRoutingNotification(int sd)
|
|
// Read through the messages on sd and if any indicate that any interface records should
|
|
// be torn down and rebuilt, return affected indices as a bitmask. Otherwise return 0.
|
|
{
|
|
ssize_t readCount;
|
|
char buff[4096];
|
|
struct nlmsghdr *pNLMsg = (struct nlmsghdr*) buff;
|
|
mDNSu32 result = 0;
|
|
|
|
// The structure here is more complex than it really ought to be because,
|
|
// unfortunately, there's no good way to size a buffer in advance large
|
|
// enough to hold all pending data and so avoid message fragmentation.
|
|
// (Note that FIONREAD is not supported on AF_NETLINK.)
|
|
|
|
readCount = read(sd, buff, sizeof buff);
|
|
while (1)
|
|
{
|
|
// Make sure we've got an entire nlmsghdr in the buffer, and payload, too.
|
|
// If not, discard already-processed messages in buffer and read more data.
|
|
if (((char*) &pNLMsg[1] > (buff + readCount)) || // i.e. *pNLMsg extends off end of buffer
|
|
((char*) pNLMsg + pNLMsg->nlmsg_len > (buff + readCount)))
|
|
{
|
|
if (buff < (char*) pNLMsg) // we have space to shuffle
|
|
{
|
|
// discard processed data
|
|
readCount -= ((char*) pNLMsg - buff);
|
|
memmove(buff, pNLMsg, readCount);
|
|
pNLMsg = (struct nlmsghdr*) buff;
|
|
|
|
// read more data
|
|
readCount += read(sd, buff + readCount, sizeof buff - readCount);
|
|
continue; // spin around and revalidate with new readCount
|
|
}
|
|
else
|
|
break; // Otherwise message does not fit in buffer
|
|
}
|
|
|
|
#if MDNS_DEBUGMSGS
|
|
PrintNetLinkMsg(pNLMsg);
|
|
#endif
|
|
|
|
// Process the NetLink message
|
|
if (pNLMsg->nlmsg_type == RTM_GETLINK || pNLMsg->nlmsg_type == RTM_NEWLINK)
|
|
result |= 1 << ((struct ifinfomsg*) NLMSG_DATA(pNLMsg))->ifi_index;
|
|
else if (pNLMsg->nlmsg_type == RTM_DELADDR || pNLMsg->nlmsg_type == RTM_NEWADDR)
|
|
result |= 1 << ((struct ifaddrmsg*) NLMSG_DATA(pNLMsg))->ifa_index;
|
|
|
|
// Advance pNLMsg to the next message in the buffer
|
|
if ((pNLMsg->nlmsg_flags & NLM_F_MULTI) != 0 && pNLMsg->nlmsg_type != NLMSG_DONE)
|
|
{
|
|
ssize_t len = readCount - ((char*)pNLMsg - buff);
|
|
pNLMsg = NLMSG_NEXT(pNLMsg, len);
|
|
}
|
|
else
|
|
break; // all done!
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
#else // USES_NETLINK
|
|
|
|
// Open a socket that will receive interface change notifications
|
|
mDNSlocal mStatus OpenIfNotifySocket(int *pFD)
|
|
{
|
|
*pFD = socket(AF_ROUTE, SOCK_RAW, 0);
|
|
|
|
if (*pFD < 0)
|
|
return mStatus_UnknownErr;
|
|
|
|
// Configure read to be non-blocking because inbound msg size is not known in advance
|
|
(void) fcntl(*pFD, F_SETFL, O_NONBLOCK);
|
|
|
|
return mStatus_NoError;
|
|
}
|
|
|
|
#if MDNS_DEBUGMSGS
|
|
mDNSlocal void PrintRoutingSocketMsg(const struct ifa_msghdr *pRSMsg)
|
|
{
|
|
const char *kRSMsgTypes[] = { "", "RTM_ADD", "RTM_DELETE", "RTM_CHANGE", "RTM_GET", "RTM_LOSING",
|
|
"RTM_REDIRECT", "RTM_MISS", "RTM_LOCK", "RTM_OLDADD", "RTM_OLDDEL", "RTM_RESOLVE",
|
|
"RTM_NEWADDR", "RTM_DELADDR", "RTM_IFINFO", "RTM_NEWMADDR", "RTM_DELMADDR" };
|
|
|
|
int index = pRSMsg->ifam_type == RTM_IFINFO ? ((struct if_msghdr*) pRSMsg)->ifm_index : pRSMsg->ifam_index;
|
|
|
|
printf("ifa_msghdr len=%d, type=%s, index=%d\n", pRSMsg->ifam_msglen, kRSMsgTypes[pRSMsg->ifam_type], index);
|
|
}
|
|
#endif
|
|
|
|
mDNSlocal mDNSu32 ProcessRoutingNotification(int sd)
|
|
// Read through the messages on sd and if any indicate that any interface records should
|
|
// be torn down and rebuilt, return affected indices as a bitmask. Otherwise return 0.
|
|
{
|
|
ssize_t readCount;
|
|
char buff[4096];
|
|
struct ifa_msghdr *pRSMsg = (struct ifa_msghdr*) buff;
|
|
mDNSu32 result = 0;
|
|
|
|
readCount = read(sd, buff, sizeof buff);
|
|
if (readCount < (ssize_t) sizeof(struct ifa_msghdr))
|
|
return mStatus_UnsupportedErr; // cannot decipher message
|
|
|
|
#if MDNS_DEBUGMSGS
|
|
PrintRoutingSocketMsg(pRSMsg);
|
|
#endif
|
|
|
|
// Process the message
|
|
if (pRSMsg->ifam_type == RTM_NEWADDR || pRSMsg->ifam_type == RTM_DELADDR ||
|
|
pRSMsg->ifam_type == RTM_IFINFO)
|
|
{
|
|
if (pRSMsg->ifam_type == RTM_IFINFO)
|
|
result |= 1 << ((struct if_msghdr*) pRSMsg)->ifm_index;
|
|
else
|
|
result |= 1 << pRSMsg->ifam_index;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
#endif // USES_NETLINK
|
|
|
|
// Called when data appears on interface change notification socket
|
|
mDNSlocal void InterfaceChangeCallback(int fd, short filter, void *context)
|
|
{
|
|
IfChangeRec *pChgRec = (IfChangeRec*) context;
|
|
fd_set readFDs;
|
|
mDNSu32 changedInterfaces = 0;
|
|
struct timeval zeroTimeout = { 0, 0 };
|
|
|
|
(void)fd; // Unused
|
|
(void)filter; // Unused
|
|
|
|
FD_ZERO(&readFDs);
|
|
FD_SET(pChgRec->NotifySD, &readFDs);
|
|
|
|
do
|
|
{
|
|
changedInterfaces |= ProcessRoutingNotification(pChgRec->NotifySD);
|
|
}
|
|
while (0 < select(pChgRec->NotifySD + 1, &readFDs, (fd_set*) NULL, (fd_set*) NULL, &zeroTimeout));
|
|
|
|
// Currently we rebuild the entire interface list whenever any interface change is
|
|
// detected. If this ever proves to be a performance issue in a multi-homed
|
|
// configuration, more care should be paid to changedInterfaces.
|
|
if (changedInterfaces)
|
|
mDNSPlatformPosixRefreshInterfaceList(pChgRec->mDNS);
|
|
}
|
|
|
|
// Register with either a Routing Socket or RtNetLink to listen for interface changes.
|
|
mDNSlocal mStatus WatchForInterfaceChange(mDNS *const m)
|
|
{
|
|
mStatus err;
|
|
IfChangeRec *pChgRec;
|
|
|
|
pChgRec = (IfChangeRec*) mDNSPlatformMemAllocate(sizeof *pChgRec);
|
|
if (pChgRec == NULL)
|
|
return mStatus_NoMemoryErr;
|
|
|
|
pChgRec->mDNS = m;
|
|
err = OpenIfNotifySocket(&pChgRec->NotifySD);
|
|
if (err == 0)
|
|
err = mDNSPosixAddFDToEventLoop(pChgRec->NotifySD, InterfaceChangeCallback, pChgRec);
|
|
|
|
return err;
|
|
}
|
|
|
|
// Test to see if we're the first client running on UDP port 5353, by trying to bind to 5353 without using SO_REUSEPORT.
|
|
// If we fail, someone else got here first. That's not a big problem; we can share the port for multicast responses --
|
|
// we just need to be aware that we shouldn't expect to successfully receive unicast UDP responses.
|
|
mDNSlocal mDNSBool mDNSPlatformInit_CanReceiveUnicast(void)
|
|
{
|
|
int err;
|
|
int s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
struct sockaddr_in s5353;
|
|
s5353.sin_family = AF_INET;
|
|
s5353.sin_port = MulticastDNSPort.NotAnInteger;
|
|
s5353.sin_addr.s_addr = 0;
|
|
err = bind(s, (struct sockaddr *)&s5353, sizeof(s5353));
|
|
close(s);
|
|
if (err) debugf("No unicast UDP responses");
|
|
else debugf("Unicast UDP responses okay");
|
|
return(err == 0);
|
|
}
|
|
|
|
// mDNS core calls this routine to initialise the platform-specific data.
|
|
mDNSexport mStatus mDNSPlatformInit(mDNS *const m)
|
|
{
|
|
int err = 0;
|
|
struct sockaddr sa;
|
|
assert(m != NULL);
|
|
|
|
if (mDNSPlatformInit_CanReceiveUnicast()) m->CanReceiveUnicastOn5353 = mDNStrue;
|
|
|
|
// Tell mDNS core the names of this machine.
|
|
|
|
// Set up the nice label
|
|
m->nicelabel.c[0] = 0;
|
|
GetUserSpecifiedFriendlyComputerName(&m->nicelabel);
|
|
if (m->nicelabel.c[0] == 0) MakeDomainLabelFromLiteralString(&m->nicelabel, "Computer");
|
|
|
|
// Set up the RFC 1034-compliant label
|
|
m->hostlabel.c[0] = 0;
|
|
GetUserSpecifiedRFC1034ComputerName(&m->hostlabel);
|
|
if (m->hostlabel.c[0] == 0) MakeDomainLabelFromLiteralString(&m->hostlabel, "Computer");
|
|
|
|
mDNS_SetFQDN(m);
|
|
|
|
sa.sa_family = AF_INET;
|
|
m->p->unicastSocket4 = -1;
|
|
if (err == mStatus_NoError) err = SetupSocket(&sa, zeroIPPort, 0, &m->p->unicastSocket4);
|
|
#if HAVE_IPV6
|
|
sa.sa_family = AF_INET6;
|
|
m->p->unicastSocket6 = -1;
|
|
if (err == mStatus_NoError) err = SetupSocket(&sa, zeroIPPort, 0, &m->p->unicastSocket6);
|
|
#endif
|
|
|
|
// Tell mDNS core about the network interfaces on this machine.
|
|
if (err == mStatus_NoError) err = SetupInterfaceList(m);
|
|
|
|
// Tell mDNS core about DNS Servers
|
|
mDNS_Lock(m);
|
|
if (err == mStatus_NoError) ParseDNSServers(m, uDNS_SERVERS_FILE);
|
|
mDNS_Unlock(m);
|
|
|
|
if (err == mStatus_NoError)
|
|
{
|
|
err = WatchForInterfaceChange(m);
|
|
// Failure to observe interface changes is non-fatal.
|
|
if (err != mStatus_NoError)
|
|
{
|
|
fprintf(stderr, "mDNS(%d) WARNING: Unable to detect interface changes (%d).\n", getpid(), err);
|
|
err = mStatus_NoError;
|
|
}
|
|
}
|
|
|
|
// We don't do asynchronous initialization on the Posix platform, so by the time
|
|
// we get here the setup will already have succeeded or failed. If it succeeded,
|
|
// we should just call mDNSCoreInitComplete() immediately.
|
|
if (err == mStatus_NoError)
|
|
mDNSCoreInitComplete(m, mStatus_NoError);
|
|
|
|
return PosixErrorToStatus(err);
|
|
}
|
|
|
|
// mDNS core calls this routine to clean up the platform-specific data.
|
|
// In our case all we need to do is to tear down every network interface.
|
|
mDNSexport void mDNSPlatformClose(mDNS *const m)
|
|
{
|
|
assert(m != NULL);
|
|
ClearInterfaceList(m);
|
|
if (m->p->unicastSocket4 != -1)
|
|
{
|
|
int ipv4_closed = close(m->p->unicastSocket4);
|
|
assert(ipv4_closed == 0);
|
|
}
|
|
#if HAVE_IPV6
|
|
if (m->p->unicastSocket6 != -1)
|
|
{
|
|
int ipv6_closed = close(m->p->unicastSocket6);
|
|
assert(ipv6_closed == 0);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
mDNSexport mStatus mDNSPlatformPosixRefreshInterfaceList(mDNS *const m)
|
|
{
|
|
int err;
|
|
ClearInterfaceList(m);
|
|
err = SetupInterfaceList(m);
|
|
return PosixErrorToStatus(err);
|
|
}
|
|
|
|
#if COMPILER_LIKES_PRAGMA_MARK
|
|
#pragma mark ***** Locking
|
|
#endif
|
|
|
|
// On the Posix platform, locking is a no-op because we only ever enter
|
|
// mDNS core on the main thread.
|
|
|
|
// mDNS core calls this routine when it wants to prevent
|
|
// the platform from reentering mDNS core code.
|
|
mDNSexport void mDNSPlatformLock (const mDNS *const m)
|
|
{
|
|
(void) m; // Unused
|
|
}
|
|
|
|
// mDNS core calls this routine when it release the lock taken by
|
|
// mDNSPlatformLock and allow the platform to reenter mDNS core code.
|
|
mDNSexport void mDNSPlatformUnlock (const mDNS *const m)
|
|
{
|
|
(void) m; // Unused
|
|
}
|
|
|
|
#if COMPILER_LIKES_PRAGMA_MARK
|
|
#pragma mark ***** Strings
|
|
#endif
|
|
|
|
// mDNS core calls this routine to copy C strings.
|
|
// On the Posix platform this maps directly to the ANSI C strcpy.
|
|
mDNSexport void mDNSPlatformStrCopy(void *dst, const void *src)
|
|
{
|
|
strcpy((char *)dst, (char *)src);
|
|
}
|
|
|
|
mDNSexport mDNSu32 mDNSPlatformStrLCopy(void *dst, const void *src, mDNSu32 len)
|
|
{
|
|
#if HAVE_STRLCPY
|
|
return ((mDNSu32)strlcpy((char *)dst, (const char *)src, len));
|
|
#else
|
|
size_t srcLen;
|
|
|
|
srcLen = strlen((const char *)src);
|
|
if (srcLen < len)
|
|
{
|
|
memcpy(dst, src, srcLen + 1);
|
|
}
|
|
else if (len > 0)
|
|
{
|
|
memcpy(dst, src, len - 1);
|
|
((char *)dst)[len - 1] = '\0';
|
|
}
|
|
|
|
return ((mDNSu32)srcLen);
|
|
#endif
|
|
}
|
|
|
|
// mDNS core calls this routine to get the length of a C string.
|
|
// On the Posix platform this maps directly to the ANSI C strlen.
|
|
mDNSexport mDNSu32 mDNSPlatformStrLen (const void *src)
|
|
{
|
|
return strlen((char*)src);
|
|
}
|
|
|
|
// mDNS core calls this routine to copy memory.
|
|
// On the Posix platform this maps directly to the ANSI C memcpy.
|
|
mDNSexport void mDNSPlatformMemCopy(void *dst, const void *src, mDNSu32 len)
|
|
{
|
|
memcpy(dst, src, len);
|
|
}
|
|
|
|
// mDNS core calls this routine to test whether blocks of memory are byte-for-byte
|
|
// identical. On the Posix platform this is a simple wrapper around ANSI C memcmp.
|
|
mDNSexport mDNSBool mDNSPlatformMemSame(const void *dst, const void *src, mDNSu32 len)
|
|
{
|
|
return memcmp(dst, src, len) == 0;
|
|
}
|
|
|
|
// mDNS core calls this routine to clear blocks of memory.
|
|
// On the Posix platform this is a simple wrapper around ANSI C memset.
|
|
mDNSexport void mDNSPlatformMemZero(void *dst, mDNSu32 len)
|
|
{
|
|
memset(dst, 0, len);
|
|
}
|
|
|
|
mDNSexport void * mDNSPlatformMemAllocate(mDNSu32 len) { return(malloc(len)); }
|
|
mDNSexport void mDNSPlatformMemFree (void *mem) { free(mem); }
|
|
|
|
mDNSexport mDNSu32 mDNSPlatformRandomSeed(void)
|
|
{
|
|
struct timeval tv;
|
|
gettimeofday(&tv, NULL);
|
|
return(tv.tv_usec);
|
|
}
|
|
|
|
mDNSexport mDNSs32 mDNSPlatformOneSecond = 1024;
|
|
|
|
mDNSexport mStatus mDNSPlatformTimeInit(void)
|
|
{
|
|
// No special setup is required on Posix -- we just use gettimeofday();
|
|
// This is not really safe, because gettimeofday can go backwards if the user manually changes the date or time
|
|
// We should find a better way to do this
|
|
return(mStatus_NoError);
|
|
}
|
|
|
|
mDNSexport mDNSs32 mDNSPlatformRawTime()
|
|
{
|
|
struct timeval tv;
|
|
gettimeofday(&tv, NULL);
|
|
// tv.tv_sec is seconds since 1st January 1970 (GMT, with no adjustment for daylight savings time)
|
|
// tv.tv_usec is microseconds since the start of this second (i.e. values 0 to 999999)
|
|
// We use the lower 22 bits of tv.tv_sec for the top 22 bits of our result
|
|
// and we multiply tv.tv_usec by 16 / 15625 to get a value in the range 0-1023 to go in the bottom 10 bits.
|
|
// This gives us a proper modular (cyclic) counter that has a resolution of roughly 1ms (actually 1/1024 second)
|
|
// and correctly cycles every 2^22 seconds (4194304 seconds = approx 48 days).
|
|
return((tv.tv_sec << 10) | (tv.tv_usec * 16 / 15625));
|
|
}
|
|
|
|
mDNSexport mDNSs32 mDNSPlatformUTC(void)
|
|
{
|
|
return time(NULL);
|
|
}
|
|
|
|
mDNSexport void mDNSPlatformSendWakeupPacket(mDNS *const m, mDNSInterfaceID InterfaceID, char *EthAddr, char *IPAddr, int iteration)
|
|
{
|
|
(void) m;
|
|
(void) InterfaceID;
|
|
(void) EthAddr;
|
|
(void) IPAddr;
|
|
(void) iteration;
|
|
}
|
|
|
|
mDNSexport mDNSBool mDNSPlatformValidRecordForInterface(AuthRecord *rr, const NetworkInterfaceInfo *intf)
|
|
{
|
|
(void) rr;
|
|
(void) intf;
|
|
|
|
return 1;
|
|
}
|
|
|
|
mDNSlocal void mDNSPosixAddToFDSet(int *nfds, fd_set *readfds, int s)
|
|
{
|
|
if (*nfds < s + 1) *nfds = s + 1;
|
|
FD_SET(s, readfds);
|
|
}
|
|
|
|
mDNSexport void mDNSPosixGetFDSet(mDNS *m, int *nfds, fd_set *readfds, struct timeval *timeout)
|
|
{
|
|
mDNSs32 ticks;
|
|
struct timeval interval;
|
|
|
|
// 1. Call mDNS_Execute() to let mDNSCore do what it needs to do
|
|
mDNSs32 nextevent = mDNS_Execute(m);
|
|
|
|
// 2. Build our list of active file descriptors
|
|
PosixNetworkInterface *info = (PosixNetworkInterface *)(m->HostInterfaces);
|
|
if (m->p->unicastSocket4 != -1) mDNSPosixAddToFDSet(nfds, readfds, m->p->unicastSocket4);
|
|
#if HAVE_IPV6
|
|
if (m->p->unicastSocket6 != -1) mDNSPosixAddToFDSet(nfds, readfds, m->p->unicastSocket6);
|
|
#endif
|
|
while (info)
|
|
{
|
|
if (info->multicastSocket4 != -1) mDNSPosixAddToFDSet(nfds, readfds, info->multicastSocket4);
|
|
#if HAVE_IPV6
|
|
if (info->multicastSocket6 != -1) mDNSPosixAddToFDSet(nfds, readfds, info->multicastSocket6);
|
|
#endif
|
|
info = (PosixNetworkInterface *)(info->coreIntf.next);
|
|
}
|
|
|
|
// 3. Calculate the time remaining to the next scheduled event (in struct timeval format)
|
|
ticks = nextevent - mDNS_TimeNow(m);
|
|
if (ticks < 1) ticks = 1;
|
|
interval.tv_sec = ticks >> 10; // The high 22 bits are seconds
|
|
interval.tv_usec = ((ticks & 0x3FF) * 15625) / 16; // The low 10 bits are 1024ths
|
|
|
|
// 4. If client's proposed timeout is more than what we want, then reduce it
|
|
if (timeout->tv_sec > interval.tv_sec ||
|
|
(timeout->tv_sec == interval.tv_sec && timeout->tv_usec > interval.tv_usec))
|
|
*timeout = interval;
|
|
}
|
|
|
|
mDNSexport void mDNSPosixProcessFDSet(mDNS *const m, fd_set *readfds)
|
|
{
|
|
PosixNetworkInterface *info;
|
|
assert(m != NULL);
|
|
assert(readfds != NULL);
|
|
info = (PosixNetworkInterface *)(m->HostInterfaces);
|
|
|
|
if (m->p->unicastSocket4 != -1 && FD_ISSET(m->p->unicastSocket4, readfds))
|
|
{
|
|
FD_CLR(m->p->unicastSocket4, readfds);
|
|
SocketDataReady(m, NULL, m->p->unicastSocket4);
|
|
}
|
|
#if HAVE_IPV6
|
|
if (m->p->unicastSocket6 != -1 && FD_ISSET(m->p->unicastSocket6, readfds))
|
|
{
|
|
FD_CLR(m->p->unicastSocket6, readfds);
|
|
SocketDataReady(m, NULL, m->p->unicastSocket6);
|
|
}
|
|
#endif
|
|
|
|
while (info)
|
|
{
|
|
if (info->multicastSocket4 != -1 && FD_ISSET(info->multicastSocket4, readfds))
|
|
{
|
|
FD_CLR(info->multicastSocket4, readfds);
|
|
SocketDataReady(m, info, info->multicastSocket4);
|
|
}
|
|
#if HAVE_IPV6
|
|
if (info->multicastSocket6 != -1 && FD_ISSET(info->multicastSocket6, readfds))
|
|
{
|
|
FD_CLR(info->multicastSocket6, readfds);
|
|
SocketDataReady(m, info, info->multicastSocket6);
|
|
}
|
|
#endif
|
|
info = (PosixNetworkInterface *)(info->coreIntf.next);
|
|
}
|
|
}
|
|
|
|
// update gMaxFD
|
|
mDNSlocal void DetermineMaxEventFD(void)
|
|
{
|
|
PosixEventSource *iSource;
|
|
|
|
gMaxFD = 0;
|
|
for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next)
|
|
if (gMaxFD < iSource->fd)
|
|
gMaxFD = iSource->fd;
|
|
}
|
|
|
|
// Add a file descriptor to the set that mDNSPosixRunEventLoopOnce() listens to.
|
|
mStatus mDNSPosixAddFDToEventLoop(int fd, mDNSPosixEventCallback callback, void *context)
|
|
{
|
|
PosixEventSource *newSource;
|
|
|
|
if (gEventSources.LinkOffset == 0)
|
|
InitLinkedList(&gEventSources, offsetof(PosixEventSource, Next));
|
|
|
|
if (fd >= (int) FD_SETSIZE || fd < 0)
|
|
return mStatus_UnsupportedErr;
|
|
if (callback == NULL)
|
|
return mStatus_BadParamErr;
|
|
|
|
newSource = (PosixEventSource*) malloc(sizeof *newSource);
|
|
if (NULL == newSource)
|
|
return mStatus_NoMemoryErr;
|
|
|
|
newSource->Callback = callback;
|
|
newSource->Context = context;
|
|
newSource->fd = fd;
|
|
|
|
AddToTail(&gEventSources, newSource);
|
|
FD_SET(fd, &gEventFDs);
|
|
|
|
DetermineMaxEventFD();
|
|
|
|
return mStatus_NoError;
|
|
}
|
|
|
|
// Remove a file descriptor from the set that mDNSPosixRunEventLoopOnce() listens to.
|
|
mStatus mDNSPosixRemoveFDFromEventLoop(int fd)
|
|
{
|
|
PosixEventSource *iSource;
|
|
|
|
for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next)
|
|
{
|
|
if (fd == iSource->fd)
|
|
{
|
|
FD_CLR(fd, &gEventFDs);
|
|
RemoveFromList(&gEventSources, iSource);
|
|
free(iSource);
|
|
DetermineMaxEventFD();
|
|
return mStatus_NoError;
|
|
}
|
|
}
|
|
return mStatus_NoSuchNameErr;
|
|
}
|
|
|
|
// Simply note the received signal in gEventSignals.
|
|
mDNSlocal void NoteSignal(int signum)
|
|
{
|
|
sigaddset(&gEventSignals, signum);
|
|
}
|
|
|
|
// Tell the event package to listen for signal and report it in mDNSPosixRunEventLoopOnce().
|
|
mStatus mDNSPosixListenForSignalInEventLoop(int signum)
|
|
{
|
|
struct sigaction action;
|
|
mStatus err;
|
|
|
|
mDNSPlatformMemZero(&action, sizeof action); // more portable than member-wise assignment
|
|
action.sa_handler = NoteSignal;
|
|
err = sigaction(signum, &action, (struct sigaction*) NULL);
|
|
|
|
sigaddset(&gEventSignalSet, signum);
|
|
|
|
return err;
|
|
}
|
|
|
|
// Tell the event package to stop listening for signal in mDNSPosixRunEventLoopOnce().
|
|
mStatus mDNSPosixIgnoreSignalInEventLoop(int signum)
|
|
{
|
|
struct sigaction action;
|
|
mStatus err;
|
|
|
|
mDNSPlatformMemZero(&action, sizeof action); // more portable than member-wise assignment
|
|
action.sa_handler = SIG_DFL;
|
|
err = sigaction(signum, &action, (struct sigaction*) NULL);
|
|
|
|
sigdelset(&gEventSignalSet, signum);
|
|
|
|
return err;
|
|
}
|
|
|
|
// Do a single pass through the attendent event sources and dispatch any found to their callbacks.
|
|
// Return as soon as internal timeout expires, or a signal we're listening for is received.
|
|
mStatus mDNSPosixRunEventLoopOnce(mDNS *m, const struct timeval *pTimeout,
|
|
sigset_t *pSignalsReceived, mDNSBool *pDataDispatched)
|
|
{
|
|
fd_set listenFDs = gEventFDs;
|
|
int fdMax = 0, numReady;
|
|
struct timeval timeout = *pTimeout;
|
|
|
|
// Include the sockets that are listening to the wire in our select() set
|
|
mDNSPosixGetFDSet(m, &fdMax, &listenFDs, &timeout); // timeout may get modified
|
|
if (fdMax < gMaxFD)
|
|
fdMax = gMaxFD;
|
|
|
|
numReady = select(fdMax + 1, &listenFDs, (fd_set*) NULL, (fd_set*) NULL, &timeout);
|
|
|
|
// If any data appeared, invoke its callback
|
|
if (numReady > 0)
|
|
{
|
|
PosixEventSource *iSource;
|
|
|
|
(void) mDNSPosixProcessFDSet(m, &listenFDs); // call this first to process wire data for clients
|
|
|
|
for (iSource=(PosixEventSource*)gEventSources.Head; iSource; iSource = iSource->Next)
|
|
{
|
|
if (FD_ISSET(iSource->fd, &listenFDs))
|
|
{
|
|
iSource->Callback(iSource->fd, 0, iSource->Context);
|
|
break; // in case callback removed elements from gEventSources
|
|
}
|
|
}
|
|
*pDataDispatched = mDNStrue;
|
|
}
|
|
else
|
|
*pDataDispatched = mDNSfalse;
|
|
|
|
(void) sigprocmask(SIG_BLOCK, &gEventSignalSet, (sigset_t*) NULL);
|
|
*pSignalsReceived = gEventSignals;
|
|
sigemptyset(&gEventSignals);
|
|
(void) sigprocmask(SIG_UNBLOCK, &gEventSignalSet, (sigset_t*) NULL);
|
|
|
|
return mStatus_NoError;
|
|
}
|