/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <arpa/inet.h>
#include <dirent.h>
#include <errno.h>
#include <linux/if.h>
#include <netdb.h>
#include <netinet/in.h>
#include <pthread.h>
#include <stdlib.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <string.h>
#include <resolv.h>
#define LOG_TAG "MDnsDS"
#define DBG 1
#define VDBG 1
#include <cutils/log.h>
#include <cutils/properties.h>
#include <sysutils/SocketClient.h>
#include "MDnsSdListener.h"
#include "ResponseCode.h"
#include "thread_util.h"
#define MDNS_SERVICE_NAME "mdnsd"
#define MDNS_SERVICE_STATUS "init.svc.mdnsd"
#define CEIL(x, y) (((x) + (y) - 1) / (y))
MDnsSdListener::MDnsSdListener() : FrameworkListener(SOCKET_NAME, true) {
Monitor *m = new Monitor();
registerCmd(new Handler(m, this));
}
MDnsSdListener::Handler::Handler(Monitor *m, MDnsSdListener *listener) :
NetdCommand("mdnssd") {
if (DBG) ALOGD("MDnsSdListener::Hander starting up");
mMonitor = m;
mListener = listener;
}
MDnsSdListener::Handler::~Handler() {}
void MDnsSdListener::Handler::discover(SocketClient *cli,
const char *iface,
const char *regType,
const char *domain,
const int requestId,
const int requestFlags) {
if (VDBG) {
ALOGD("discover(%s, %s, %s, %d, %d)", iface, regType, domain, requestId,
requestFlags);
}
Context *context = new Context(requestId, mListener);
DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
if (ref == NULL) {
ALOGE("requestId %d already in use during discover call", requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"RequestId already in use during discover call", false);
return;
}
if (VDBG) ALOGD("using ref %p", ref);
DNSServiceFlags nativeFlags = iToFlags(requestFlags);
int interfaceInt = ifaceNameToI(iface);
DNSServiceErrorType result = DNSServiceBrowse(ref, nativeFlags, interfaceInt, regType,
domain, &MDnsSdListenerDiscoverCallback, context);
if (result != kDNSServiceErr_NoError) {
ALOGE("Discover request %d got an error from DNSServiceBrowse %d", requestId, result);
mMonitor->freeServiceRef(requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"Discover request got an error from DNSServiceBrowse", false);
return;
}
mMonitor->startMonitoring(requestId);
if (VDBG) ALOGD("discover successful");
cli->sendMsg(ResponseCode::CommandOkay, "Discover operation started", false);
return;
}
void MDnsSdListenerDiscoverCallback(DNSServiceRef /* sdRef */, DNSServiceFlags flags,
uint32_t /* interfaceIndex */, DNSServiceErrorType errorCode, const char *serviceName,
const char *regType, const char *replyDomain, void *inContext) {
MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
char *msg;
int refNumber = context->mRefNumber;
if (errorCode != kDNSServiceErr_NoError) {
asprintf(&msg, "%d %d", refNumber, errorCode);
context->mListener->sendBroadcast(ResponseCode::ServiceDiscoveryFailed, msg, false);
if (DBG) ALOGE("discover failure for %d, error= %d", refNumber, errorCode);
} else {
int respCode;
char *quotedServiceName = SocketClient::quoteArg(serviceName);
if (flags & kDNSServiceFlagsAdd) {
if (VDBG) {
ALOGD("Discover found new serviceName %s, regType %s and domain %s for %d",
serviceName, regType, replyDomain, refNumber);
}
respCode = ResponseCode::ServiceDiscoveryServiceAdded;
} else {
if (VDBG) {
ALOGD("Discover lost serviceName %s, regType %s and domain %s for %d",
serviceName, regType, replyDomain, refNumber);
}
respCode = ResponseCode::ServiceDiscoveryServiceRemoved;
}
asprintf(&msg, "%d %s %s %s", refNumber, quotedServiceName, regType, replyDomain);
free(quotedServiceName);
context->mListener->sendBroadcast(respCode, msg, false);
}
free(msg);
}
void MDnsSdListener::Handler::stop(SocketClient *cli, int argc, char **argv, const char *str) {
if (argc != 3) {
char *msg;
asprintf(&msg, "Invalid number of arguments to %s", str);
cli->sendMsg(ResponseCode::CommandParameterError, msg, false);
free(msg);
return;
}
int requestId = atoi(argv[2]);
DNSServiceRef *ref = mMonitor->lookupServiceRef(requestId);
if (ref == NULL) {
if (DBG) ALOGE("%s stop used unknown requestId %d", str, requestId);
cli->sendMsg(ResponseCode::CommandParameterError, "Unknown requestId", false);
return;
}
if (VDBG) ALOGD("Stopping %s with ref %p", str, ref);
DNSServiceRefDeallocate(*ref);
mMonitor->freeServiceRef(requestId);
char *msg;
asprintf(&msg, "%s stopped", str);
cli->sendMsg(ResponseCode::CommandOkay, msg, false);
free(msg);
}
void MDnsSdListener::Handler::serviceRegister(SocketClient *cli, int requestId,
const char *interfaceName, const char *serviceName, const char *serviceType,
const char *domain, const char *host, int port, int txtLen, void *txtRecord) {
if (VDBG) {
ALOGD("serviceRegister(%d, %s, %s, %s, %s, %s, %d, %d, <binary>)", requestId,
interfaceName, serviceName, serviceType, domain, host, port, txtLen);
}
Context *context = new Context(requestId, mListener);
DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
port = htons(port);
if (ref == NULL) {
ALOGE("requestId %d already in use during register call", requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"RequestId already in use during register call", false);
return;
}
DNSServiceFlags nativeFlags = 0;
int interfaceInt = ifaceNameToI(interfaceName);
DNSServiceErrorType result = DNSServiceRegister(ref, interfaceInt, nativeFlags, serviceName,
serviceType, domain, host, port, txtLen, txtRecord, &MDnsSdListenerRegisterCallback,
context);
if (result != kDNSServiceErr_NoError) {
ALOGE("service register request %d got an error from DNSServiceRegister %d", requestId,
result);
mMonitor->freeServiceRef(requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"serviceRegister request got an error from DNSServiceRegister", false);
return;
}
mMonitor->startMonitoring(requestId);
if (VDBG) ALOGD("serviceRegister successful");
cli->sendMsg(ResponseCode::CommandOkay, "serviceRegister started", false);
return;
}
void MDnsSdListenerRegisterCallback(DNSServiceRef /* sdRef */, DNSServiceFlags /* flags */,
DNSServiceErrorType errorCode, const char *serviceName, const char * /* regType */,
const char * /* domain */, void *inContext) {
MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
char *msg;
int refNumber = context->mRefNumber;
if (errorCode != kDNSServiceErr_NoError) {
asprintf(&msg, "%d %d", refNumber, errorCode);
context->mListener->sendBroadcast(ResponseCode::ServiceRegistrationFailed, msg, false);
if (DBG) ALOGE("register failure for %d, error= %d", refNumber, errorCode);
} else {
char *quotedServiceName = SocketClient::quoteArg(serviceName);
asprintf(&msg, "%d %s", refNumber, quotedServiceName);
free(quotedServiceName);
context->mListener->sendBroadcast(ResponseCode::ServiceRegistrationSucceeded, msg, false);
if (VDBG) ALOGD("register succeeded for %d as %s", refNumber, serviceName);
}
free(msg);
}
void MDnsSdListener::Handler::resolveService(SocketClient *cli, int requestId,
const char *interfaceName, const char *serviceName, const char *regType,
const char *domain) {
if (VDBG) {
ALOGD("resolveService(%d, %s, %s, %s, %s)", requestId, interfaceName,
serviceName, regType, domain);
}
Context *context = new Context(requestId, mListener);
DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
if (ref == NULL) {
ALOGE("request Id %d already in use during resolve call", requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"RequestId already in use during resolve call", false);
return;
}
DNSServiceFlags nativeFlags = 0;
int interfaceInt = ifaceNameToI(interfaceName);
DNSServiceErrorType result = DNSServiceResolve(ref, nativeFlags, interfaceInt, serviceName,
regType, domain, &MDnsSdListenerResolveCallback, context);
if (result != kDNSServiceErr_NoError) {
ALOGE("service resolve request %d got an error from DNSServiceResolve %d", requestId,
result);
mMonitor->freeServiceRef(requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"resolveService got an error from DNSServiceResolve", false);
return;
}
mMonitor->startMonitoring(requestId);
if (VDBG) ALOGD("resolveService successful");
cli->sendMsg(ResponseCode::CommandOkay, "resolveService started", false);
return;
}
void MDnsSdListenerResolveCallback(DNSServiceRef /* sdRef */, DNSServiceFlags /* flags */,
uint32_t /* interface */, DNSServiceErrorType errorCode, const char *fullname,
const char *hosttarget, uint16_t port, uint16_t txtLen,
const unsigned char *txtRecord , void *inContext) {
MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
char *msg;
int refNumber = context->mRefNumber;
port = ntohs(port);
if (errorCode != kDNSServiceErr_NoError) {
asprintf(&msg, "%d %d", refNumber, errorCode);
context->mListener->sendBroadcast(ResponseCode::ServiceResolveFailed, msg, false);
if (DBG) ALOGE("resolve failure for %d, error= %d", refNumber, errorCode);
} else {
char *quotedFullName = SocketClient::quoteArg(fullname);
char *quotedHostTarget = SocketClient::quoteArg(hosttarget);
// Base 64 encodes every 3 bytes into 4 characters, but then adds padding to the next
// multiple of 4 and a \0
size_t dstLength = CEIL(CEIL(txtLen * 4, 3), 4) * 4 + 1;
char *dst = (char *)malloc(dstLength);
b64_ntop(txtRecord, txtLen, dst, dstLength);
asprintf(&msg, "%d %s %s %d %d \"%s\"", refNumber, quotedFullName, quotedHostTarget, port,
txtLen, dst);
free(quotedFullName);
free(quotedHostTarget);
free(dst);
context->mListener->sendBroadcast(ResponseCode::ServiceResolveSuccess, msg, false);
if (VDBG) {
ALOGD("resolve succeeded for %d finding %s at %s:%d with txtLen %d",
refNumber, fullname, hosttarget, port, txtLen);
}
}
free(msg);
}
void MDnsSdListener::Handler::getAddrInfo(SocketClient *cli, int requestId,
const char *interfaceName, uint32_t protocol, const char *hostname) {
if (VDBG) ALOGD("getAddrInfo(%d, %s %d, %s)", requestId, interfaceName, protocol, hostname);
Context *context = new Context(requestId, mListener);
DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
if (ref == NULL) {
ALOGE("request ID %d already in use during getAddrInfo call", requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"RequestId already in use during getAddrInfo call", false);
return;
}
DNSServiceFlags nativeFlags = 0;
int interfaceInt = ifaceNameToI(interfaceName);
DNSServiceErrorType result = DNSServiceGetAddrInfo(ref, nativeFlags, interfaceInt, protocol,
hostname, &MDnsSdListenerGetAddrInfoCallback, context);
if (result != kDNSServiceErr_NoError) {
ALOGE("getAddrInfo request %d got an error from DNSServiceGetAddrInfo %d", requestId,
result);
mMonitor->freeServiceRef(requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"getAddrInfo request got an error from DNSServiceGetAddrInfo", false);
return;
}
mMonitor->startMonitoring(requestId);
if (VDBG) ALOGD("getAddrInfo successful");
cli->sendMsg(ResponseCode::CommandOkay, "getAddrInfo started", false);
return;
}
void MDnsSdListenerGetAddrInfoCallback(DNSServiceRef /* sdRef */, DNSServiceFlags /* flags */,
uint32_t /* interface */, DNSServiceErrorType errorCode, const char *hostname,
const struct sockaddr *const sa, uint32_t ttl, void *inContext) {
MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
int refNumber = context->mRefNumber;
if (errorCode != kDNSServiceErr_NoError) {
char *msg;
asprintf(&msg, "%d %d", refNumber, errorCode);
context->mListener->sendBroadcast(ResponseCode::ServiceGetAddrInfoFailed, msg, false);
if (DBG) ALOGE("getAddrInfo failure for %d, error= %d", refNumber, errorCode);
free(msg);
} else {
char addr[INET6_ADDRSTRLEN];
char *msg;
char *quotedHostname = SocketClient::quoteArg(hostname);
if (sa->sa_family == AF_INET) {
inet_ntop(sa->sa_family, &(((struct sockaddr_in *)sa)->sin_addr), addr, sizeof(addr));
} else {
inet_ntop(sa->sa_family, &(((struct sockaddr_in6 *)sa)->sin6_addr), addr, sizeof(addr));
}
asprintf(&msg, "%d %s %d %s", refNumber, quotedHostname, ttl, addr);
free(quotedHostname);
context->mListener->sendBroadcast(ResponseCode::ServiceGetAddrInfoSuccess, msg, false);
if (VDBG) {
ALOGD("getAddrInfo succeeded for %d: %s", refNumber, msg);
}
free(msg);
}
}
void MDnsSdListener::Handler::setHostname(SocketClient *cli, int requestId,
const char *hostname) {
if (VDBG) ALOGD("setHostname(%d, %s)", requestId, hostname);
Context *context = new Context(requestId, mListener);
DNSServiceRef *ref = mMonitor->allocateServiceRef(requestId, context);
if (ref == NULL) {
ALOGE("request Id %d already in use during setHostname call", requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"RequestId already in use during setHostname call", false);
return;
}
DNSServiceFlags nativeFlags = 0;
DNSServiceErrorType result = DNSSetHostname(ref, nativeFlags, hostname,
&MDnsSdListenerSetHostnameCallback, context);
if (result != kDNSServiceErr_NoError) {
ALOGE("setHostname request %d got an error from DNSSetHostname %d", requestId, result);
mMonitor->freeServiceRef(requestId);
cli->sendMsg(ResponseCode::CommandParameterError,
"setHostname got an error from DNSSetHostname", false);
return;
}
mMonitor->startMonitoring(requestId);
if (VDBG) ALOGD("setHostname successful");
cli->sendMsg(ResponseCode::CommandOkay, "setHostname started", false);
return;
}
void MDnsSdListenerSetHostnameCallback(DNSServiceRef /* sdRef */, DNSServiceFlags /* flags */,
DNSServiceErrorType errorCode, const char *hostname, void *inContext) {
MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext);
char *msg;
int refNumber = context->mRefNumber;
if (errorCode != kDNSServiceErr_NoError) {
asprintf(&msg, "%d %d", refNumber, errorCode);
context->mListener->sendBroadcast(ResponseCode::ServiceSetHostnameFailed, msg, false);
if (DBG) ALOGE("setHostname failure for %d, error= %d", refNumber, errorCode);
} else {
char *quotedHostname = SocketClient::quoteArg(hostname);
asprintf(&msg, "%d %s", refNumber, quotedHostname);
free(quotedHostname);
context->mListener->sendBroadcast(ResponseCode::ServiceSetHostnameSuccess, msg, false);
if (VDBG) ALOGD("setHostname succeeded for %d. Set to %s", refNumber, hostname);
}
free(msg);
}
int MDnsSdListener::Handler::ifaceNameToI(const char * /* iface */) {
return 0;
}
const char *MDnsSdListener::Handler::iToIfaceName(int /* i */) {
return NULL;
}
DNSServiceFlags MDnsSdListener::Handler::iToFlags(int /* i */) {
return 0;
}
int MDnsSdListener::Handler::flagsToI(DNSServiceFlags /* flags */) {
return 0;
}
int MDnsSdListener::Handler::runCommand(SocketClient *cli,
int argc, char **argv) {
if (argc < 2) {
char* msg = NULL;
asprintf( &msg, "Invalid number of arguments to mdnssd: %i", argc);
ALOGW("%s", msg);
cli->sendMsg(ResponseCode::CommandParameterError, msg, false);
free(msg);
return -1;
}
char* cmd = argv[1];
if (strcmp(cmd, "discover") == 0) {
if (argc != 4) {
cli->sendMsg(ResponseCode::CommandParameterError,
"Invalid number of arguments to mdnssd discover", false);
return 0;
}
int requestId = atoi(argv[2]);
char *serviceType = argv[3];
discover(cli, NULL, serviceType, NULL, requestId, 0);
} else if (strcmp(cmd, "stop-discover") == 0) {
stop(cli, argc, argv, "discover");
} else if (strcmp(cmd, "register") == 0) {
if (argc != 7) {
cli->sendMsg(ResponseCode::CommandParameterError,
"Invalid number of arguments to mdnssd register", false);
return 0;
}
int requestId = atoi(argv[2]);
char *serviceName = argv[3];
char *serviceType = argv[4];
int port = atoi(argv[5]);
char *interfaceName = NULL; // will use all
char *domain = NULL; // will use default
char *host = NULL; // will use default hostname
// TXT record length is <= 1300, see NsdServiceInfo.setAttribute
char dst[1300];
int length = b64_pton(argv[6], (u_char *)dst, 1300);
if (length < 0) {
cli->sendMsg(ResponseCode::CommandParameterError,
"Could not decode txtRecord", false);
return 0;
}
serviceRegister(cli, requestId, interfaceName, serviceName,
serviceType, domain, host, port, length, dst);
} else if (strcmp(cmd, "stop-register") == 0) {
stop(cli, argc, argv, "register");
} else if (strcmp(cmd, "resolve") == 0) {
if (argc != 6) {
cli->sendMsg(ResponseCode::CommandParameterError,
"Invalid number of arguments to mdnssd resolve", false);
return 0;
}
int requestId = atoi(argv[2]);
char *interfaceName = NULL; // will use all
char *serviceName = argv[3];
char *regType = argv[4];
char *domain = argv[5];
resolveService(cli, requestId, interfaceName, serviceName, regType, domain);
} else if (strcmp(cmd, "stop-resolve") == 0) {
stop(cli, argc, argv, "resolve");
} else if (strcmp(cmd, "start-service") == 0) {
if (mMonitor->startService()) {
cli->sendMsg(ResponseCode::CommandOkay, "Service Started", false);
} else {
cli->sendMsg(ResponseCode::ServiceStartFailed, "Service already running", false);
}
} else if (strcmp(cmd, "stop-service") == 0) {
if (mMonitor->stopService()) {
cli->sendMsg(ResponseCode::CommandOkay, "Service Stopped", false);
} else {
cli->sendMsg(ResponseCode::ServiceStopFailed, "Service still in use", false);
}
} else if (strcmp(cmd, "sethostname") == 0) {
if (argc != 4) {
cli->sendMsg(ResponseCode::CommandParameterError,
"Invalid number of arguments to mdnssd sethostname", false);
return 0;
}
int requestId = atoi(argv[2]);
char *hostname = argv[3];
setHostname(cli, requestId, hostname);
} else if (strcmp(cmd, "stop-sethostname") == 0) {
stop(cli, argc, argv, "sethostname");
} else if (strcmp(cmd, "getaddrinfo") == 0) {
if (argc != 4) {
cli->sendMsg(ResponseCode::CommandParameterError,
"Invalid number of arguments to mdnssd getaddrinfo", false);
return 0;
}
int requestId = atoi(argv[2]);
char *hostname = argv[3];
char *interfaceName = NULL; // default
int protocol = 0; // intelligient heuristic (both v4 + v6)
getAddrInfo(cli, requestId, interfaceName, protocol, hostname);
} else if (strcmp(cmd, "stop-getaddrinfo") == 0) {
stop(cli, argc, argv, "getaddrinfo");
} else {
if (VDBG) ALOGE("Unknown cmd %s", cmd);
cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown mdnssd cmd", false);
return 0;
}
return 0;
}
MDnsSdListener::Monitor::Monitor() {
mHead = NULL;
mLiveCount = 0;
mPollFds = NULL;
mPollRefs = NULL;
mPollSize = 10;
socketpair(AF_LOCAL, SOCK_STREAM, 0, mCtrlSocketPair);
pthread_mutex_init(&mHeadMutex, NULL);
const int rval = ::android::net::threadLaunch(this);
if (rval != 0) {
ALOGW("Error spawning monitor thread: %s (%d)", strerror(-rval), -rval);
}
}
#define NAP_TIME 200 // 200 ms between polls
static int wait_for_property(const char *name, const char *desired_value, int maxwait)
{
char value[PROPERTY_VALUE_MAX] = {'\0'};
int maxnaps = (maxwait * 1000) / NAP_TIME;
if (maxnaps < 1) {
maxnaps = 1;
}
while (maxnaps-- > 0) {
usleep(NAP_TIME * 1000);
if (property_get(name, value, NULL)) {
if (desired_value == NULL || strcmp(value, desired_value) == 0) {
return 0;
}
}
}
return -1; /* failure */
}
int MDnsSdListener::Monitor::startService() {
int result = 0;
char property_value[PROPERTY_VALUE_MAX];
pthread_mutex_lock(&mHeadMutex);
property_get(MDNS_SERVICE_STATUS, property_value, "");
if (strcmp("running", property_value) != 0) {
ALOGD("Starting MDNSD");
property_set("ctl.start", MDNS_SERVICE_NAME);
wait_for_property(MDNS_SERVICE_STATUS, "running", 5);
result = -1;
} else {
result = 0;
}
pthread_mutex_unlock(&mHeadMutex);
return result;
}
int MDnsSdListener::Monitor::stopService() {
int result = 0;
pthread_mutex_lock(&mHeadMutex);
if (mHead == NULL) {
ALOGD("Stopping MDNSD");
property_set("ctl.stop", MDNS_SERVICE_NAME);
wait_for_property(MDNS_SERVICE_STATUS, "stopped", 5);
result = -1;
} else {
result = 0;
}
pthread_mutex_unlock(&mHeadMutex);
return result;
}
void MDnsSdListener::Monitor::run() {
int pollCount = 1;
mPollFds = (struct pollfd *)calloc(sizeof(struct pollfd), mPollSize);
mPollRefs = (DNSServiceRef **)calloc(sizeof(DNSServiceRef *), mPollSize);
LOG_ALWAYS_FATAL_IF((mPollFds == NULL), "initial calloc failed on mPollFds with a size of %d",
((int)sizeof(struct pollfd)) * mPollSize);
LOG_ALWAYS_FATAL_IF((mPollRefs == NULL), "initial calloc failed on mPollRefs with a size of %d",
((int)sizeof(DNSServiceRef *)) * mPollSize);
mPollFds[0].fd = mCtrlSocketPair[0];
mPollFds[0].events = POLLIN;
if (VDBG) ALOGD("MDnsSdListener starting to monitor");
while (1) {
if (VDBG) ALOGD("Going to poll with pollCount %d", pollCount);
int pollResults = poll(mPollFds, pollCount, 10000000);
if (pollResults < 0) {
ALOGE("Error in poll - got %d", errno);
} else if (pollResults > 0) {
if (VDBG) ALOGD("Monitor poll got data pollCount = %d, %d", pollCount, pollResults);
for(int i = 1; i < pollCount; i++) {
if (mPollFds[i].revents != 0) {
if (VDBG) {
ALOGD("Monitor found [%d].revents = %d - calling ProcessResults",
i, mPollFds[i].revents);
}
DNSServiceProcessResult(*(mPollRefs[i]));
mPollFds[i].revents = 0;
}
}
if (VDBG) ALOGD("controlSocket shows revent= %d", mPollFds[0].revents);
switch (mPollFds[0].revents) {
case POLLIN: {
char readBuf[2];
read(mCtrlSocketPair[0], &readBuf, 1);
if (DBG) ALOGD("MDnsSdListener::Monitor got %c", readBuf[0]);
if (memcmp(RESCAN, readBuf, 1) == 0) {
pollCount = rescan();
}
}
}
mPollFds[0].revents = 0;
} else {
if (VDBG) ALOGD("MDnsSdListener::Monitor poll timed out");
}
}
free(mPollFds);
free(mPollRefs);
}
#define DBG_RESCAN 0
int MDnsSdListener::Monitor::rescan() {
// rescan the list from mHead and make new pollfds and serviceRefs
if (VDBG) {
ALOGD("MDnsSdListener::Monitor poll rescanning - size=%d, live=%d", mPollSize, mLiveCount);
}
pthread_mutex_lock(&mHeadMutex);
Element **prevPtr = &mHead;
int i = 1;
if (mPollSize <= mLiveCount) {
mPollSize = mLiveCount + 5;
free(mPollFds);
free(mPollRefs);
mPollFds = (struct pollfd *)calloc(sizeof(struct pollfd), mPollSize);
mPollRefs = (DNSServiceRef **)calloc(sizeof(DNSServiceRef *), mPollSize);
LOG_ALWAYS_FATAL_IF((mPollFds == NULL), "calloc failed on mPollFds with a size of %d",
((int)sizeof(struct pollfd)) * mPollSize);
LOG_ALWAYS_FATAL_IF((mPollRefs == NULL), "calloc failed on mPollRefs with a size of %d",
((int)sizeof(DNSServiceRef *)) * mPollSize);
} else {
memset(mPollFds, 0, sizeof(struct pollfd) * mPollSize);
memset(mPollRefs, 0, sizeof(DNSServiceRef *) * mPollSize);
}
mPollFds[0].fd = mCtrlSocketPair[0];
mPollFds[0].events = POLLIN;
if (DBG_RESCAN) ALOGD("mHead = %p", mHead);
while (*prevPtr != NULL) {
if (DBG_RESCAN) ALOGD("checking %p, mReady = %d", *prevPtr, (*prevPtr)->mReady);
if ((*prevPtr)->mReady == 1) {
int fd = DNSServiceRefSockFD((*prevPtr)->mRef);
if (fd != -1) {
if (DBG_RESCAN) ALOGD(" adding FD %d", fd);
mPollFds[i].fd = fd;
mPollFds[i].events = POLLIN;
mPollRefs[i] = &((*prevPtr)->mRef);
i++;
} else {
ALOGE("Error retreving socket FD for live ServiceRef");
}
prevPtr = &((*prevPtr)->mNext); // advance to the next element
} else if ((*prevPtr)->mReady == -1) {
if (DBG_RESCAN) ALOGD(" removing %p from play", *prevPtr);
Element *cur = *prevPtr;
*prevPtr = (cur)->mNext; // change our notion of this element and don't advance
delete cur;
} else if ((*prevPtr)->mReady == 0) {
// Not ready so just skip this node and continue on
if (DBG_RESCAN) ALOGD("%p not ready. Continuing.", *prevPtr);
prevPtr = &((*prevPtr)->mNext);
}
}
pthread_mutex_unlock(&mHeadMutex);
return i;
}
DNSServiceRef *MDnsSdListener::Monitor::allocateServiceRef(int id, Context *context) {
if (lookupServiceRef(id) != NULL) {
delete(context);
return NULL;
}
Element *e = new Element(id, context);
pthread_mutex_lock(&mHeadMutex);
e->mNext = mHead;
mHead = e;
pthread_mutex_unlock(&mHeadMutex);
return &(e->mRef);
}
DNSServiceRef *MDnsSdListener::Monitor::lookupServiceRef(int id) {
pthread_mutex_lock(&mHeadMutex);
Element *cur = mHead;
while (cur != NULL) {
if (cur->mId == id) {
DNSServiceRef *result = &(cur->mRef);
pthread_mutex_unlock(&mHeadMutex);
return result;
}
cur = cur->mNext;
}
pthread_mutex_unlock(&mHeadMutex);
return NULL;
}
void MDnsSdListener::Monitor::startMonitoring(int id) {
if (VDBG) ALOGD("startMonitoring %d", id);
pthread_mutex_lock(&mHeadMutex);
Element *cur = mHead;
while (cur != NULL) {
if (cur->mId == id) {
if (DBG_RESCAN) ALOGD("marking %p as ready to be added", cur);
mLiveCount++;
cur->mReady = 1;
pthread_mutex_unlock(&mHeadMutex);
write(mCtrlSocketPair[1], RESCAN, 1); // trigger a rescan for a fresh poll
if (VDBG) ALOGD("triggering rescan");
return;
}
cur = cur->mNext;
}
pthread_mutex_unlock(&mHeadMutex);
}
void MDnsSdListener::Monitor::freeServiceRef(int id) {
if (VDBG) ALOGD("freeServiceRef %d", id);
pthread_mutex_lock(&mHeadMutex);
Element **prevPtr = &mHead;
Element *cur;
while (*prevPtr != NULL) {
cur = *prevPtr;
if (cur->mId == id) {
if (DBG_RESCAN) ALOGD("marking %p as ready to be removed", cur);
mLiveCount--;
if (cur->mReady == 1) {
cur->mReady = -1; // tell poll thread to delete
cur->mRef = NULL; // do not process further results
write(mCtrlSocketPair[1], RESCAN, 1); // trigger a rescan for a fresh poll
if (VDBG) ALOGD("triggering rescan");
} else {
*prevPtr = cur->mNext;
delete cur;
}
pthread_mutex_unlock(&mHeadMutex);
return;
}
prevPtr = &(cur->mNext);
}
pthread_mutex_unlock(&mHeadMutex);
}