void
nsHostResolver::ThreadFunc(void *arg)
{
    LOG(("DNS lookup thread starting execution.\n"));

    static nsThreadPoolNaming naming;
    naming.SetThreadPoolName(NS_LITERAL_CSTRING("DNS Resolver"));

#if defined(RES_RETRY_ON_FAILURE)
    nsResState rs;
#endif
    nsHostResolver *resolver = (nsHostResolver *)arg;
    nsHostRecord *rec;
    PRAddrInfo *prai = nullptr;
    while (resolver->GetHostToLookup(&rec)) {
        LOG(("Calling getaddrinfo for host [%s].\n", rec->host));

        int flags = PR_AI_ADDRCONFIG;
        if (!(rec->flags & RES_CANON_NAME))
            flags |= PR_AI_NOCANONNAME;

        TimeStamp startTime = TimeStamp::Now();

        prai = PR_GetAddrInfoByName(rec->host, rec->af, flags);
#if defined(RES_RETRY_ON_FAILURE)
        if (!prai && rs.Reset())
            prai = PR_GetAddrInfoByName(rec->host, rec->af, flags);
#endif

        TimeDuration elapsed = TimeStamp::Now() - startTime;
        uint32_t millis = static_cast<uint32_t>(elapsed.ToMilliseconds());

        // convert error code to nsresult
        nsresult status;
        AddrInfo *ai = nullptr;
        if (prai) {
            ai = new AddrInfo(rec->host, prai);
            PR_FreeAddrInfo(prai);

            status = NS_OK;

            Telemetry::Accumulate(!rec->addr_info_gencnt ?
                                  Telemetry::DNS_LOOKUP_TIME :
                                  Telemetry::DNS_RENEWAL_TIME,
                                  millis);
        }
        else {
            status = NS_ERROR_UNKNOWN_HOST;
            Telemetry::Accumulate(Telemetry::DNS_FAILED_LOOKUP_TIME, millis);
        }

        // OnLookupComplete may release "rec", log before we lose it.
        LOG(("Lookup completed for host [%s].\n", rec->host));
        resolver->OnLookupComplete(rec, status, ai);
    }
    NS_RELEASE(resolver);
    LOG(("DNS lookup thread ending execution.\n"));
}
예제 #2
0
void
nsHostResolver::ThreadFunc(void *arg)
{
    LOG(("DNS lookup thread starting execution.\n"));

    static nsThreadPoolNaming naming;
    naming.SetThreadPoolName(NS_LITERAL_CSTRING("DNS Resolver"));

#if defined(RES_RETRY_ON_FAILURE)
    nsResState rs;
#endif
    nsHostResolver *resolver = (nsHostResolver *)arg;
    nsHostRecord *rec;
    PRAddrInfo *prai = nullptr;
    while (resolver->GetHostToLookup(&rec)) {
        LOG(("Calling getaddrinfo for host [%s].\n", rec->host));

        int flags = PR_AI_ADDRCONFIG;
        if (!(rec->flags & RES_CANON_NAME))
            flags |= PR_AI_NOCANONNAME;

        TimeStamp startTime = TimeStamp::Now();
        MOZ_EVENT_TRACER_EXEC(rec, "net::dns::resolve");

        // We need to remove IPv4 records manually
        // because PR_GetAddrInfoByName doesn't support PR_AF_INET6.
        bool disableIPv4 = rec->af == PR_AF_INET6;
        uint16_t af = disableIPv4 ? PR_AF_UNSPEC : rec->af;
        prai = PR_GetAddrInfoByName(rec->host, af, flags);
#if defined(RES_RETRY_ON_FAILURE)
        if (!prai && rs.Reset())
            prai = PR_GetAddrInfoByName(rec->host, af, flags);
#endif

        TimeDuration elapsed = TimeStamp::Now() - startTime;
        uint32_t millis = static_cast<uint32_t>(elapsed.ToMilliseconds());

        // convert error code to nsresult
        nsresult status;
        AddrInfo *ai = nullptr;
        if (prai) {
            ai = new AddrInfo(rec->host, prai, disableIPv4);
            PR_FreeAddrInfo(prai);
            if (ai->mAddresses.isEmpty()) {
                delete ai;
                ai = nullptr;
            }
        }
        if (ai) {
            status = NS_OK;

            Telemetry::Accumulate(!rec->addr_info_gencnt ?
                                    Telemetry::DNS_LOOKUP_TIME :
                                    Telemetry::DNS_RENEWAL_TIME,
                                  millis);
        }
        else {
            status = NS_ERROR_UNKNOWN_HOST;
            Telemetry::Accumulate(Telemetry::DNS_FAILED_LOOKUP_TIME, millis);
        }

        // OnLookupComplete may release "rec", log before we lose it.
        LOG(("Lookup completed for host [%s].\n", rec->host));
        resolver->OnLookupComplete(rec, status, ai);
    }
    NS_RELEASE(resolver);
    LOG(("DNS lookup thread ending execution.\n"));
}