Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 479 insertions, 0 deletions

diff --git a/netwerk/dns/GetAddrInfo.cpp b/netwerk/dns/GetAddrInfo.cpp
new file mode 100644
index 0000000000..2f0354bd96
--- /dev/null
+++ b/netwerk/dns/GetAddrInfo.cpp
@@ -0,0 +1,479 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GetAddrInfo.h"
+
+#ifdef DNSQUERY_AVAILABLE
+// There is a bug in windns.h where the type of parameter ppQueryResultsSet for
+// DnsQuery_A is dependent on UNICODE being set. It should *always* be
+// PDNS_RECORDA, but if UNICODE is set it is PDNS_RECORDW. To get around this
+// we make sure that UNICODE is unset.
+#  undef UNICODE
+#  include <ws2tcpip.h>
+#  undef GetAddrInfo
+#  include <windns.h>
+#endif  // DNSQUERY_AVAILABLE
+
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/net/DNS.h"
+#include "NativeDNSResolverOverrideParent.h"
+#include "prnetdb.h"
+#include "nsIOService.h"
+#include "nsHostResolver.h"
+#include "nsError.h"
+#include "mozilla/net/DNS.h"
+#include <algorithm>
+#include "prerror.h"
+
+#include "mozilla/Logging.h"
+#include "mozilla/StaticPrefs_network.h"
+
+namespace mozilla::net {
+
+static StaticRefPtr<NativeDNSResolverOverride> gOverrideService;
+
+static LazyLogModule gGetAddrInfoLog("GetAddrInfo");
+#define LOG(msg, ...) \
+  MOZ_LOG(gGetAddrInfoLog, LogLevel::Debug, ("[DNS]: " msg, ##__VA_ARGS__))
+#define LOG_WARNING(msg, ...) \
+  MOZ_LOG(gGetAddrInfoLog, LogLevel::Warning, ("[DNS]: " msg, ##__VA_ARGS__))
+
+#ifdef DNSQUERY_AVAILABLE
+
+#  define COMPUTER_NAME_BUFFER_SIZE 100
+static char sDNSComputerName[COMPUTER_NAME_BUFFER_SIZE];
+static char sNETBIOSComputerName[MAX_COMPUTERNAME_LENGTH + 1];
+
+////////////////////////////
+// WINDOWS IMPLEMENTATION //
+////////////////////////////
+
+// Ensure consistency of PR_* and AF_* constants to allow for legacy usage of
+// PR_* constants with this API.
+static_assert(PR_AF_INET == AF_INET && PR_AF_INET6 == AF_INET6 &&
+                  PR_AF_UNSPEC == AF_UNSPEC,
+              "PR_AF_* must match AF_*");
+
+// If successful, returns in aResult a TTL value that is smaller or
+// equal with the one already there. Gets the TTL value by calling
+// to DnsQuery_A and iterating through the returned
+// records to find the one with the smallest TTL value.
+static MOZ_ALWAYS_INLINE nsresult _CallDnsQuery_A_Windows(
+    const nsACString& aHost, uint16_t aAddressFamily, DWORD aFlags,
+    std::function<void(PDNS_RECORDA)> aCallback) {
+  NS_ConvertASCIItoUTF16 name(aHost);
+
+  auto callDnsQuery_A = [&](uint16_t reqFamily) {
+    PDNS_RECORDA dnsData = nullptr;
+    DNS_STATUS status = DnsQuery_A(aHost.BeginReading(), reqFamily, aFlags,
+                                   nullptr, &dnsData, nullptr);
+    if (status == DNS_INFO_NO_RECORDS || status == DNS_ERROR_RCODE_NAME_ERROR ||
+        !dnsData) {
+      LOG("No DNS records found for %s. status=%lX. reqFamily = %X\n",
+          aHost.BeginReading(), status, reqFamily);
+      return NS_ERROR_FAILURE;
+    } else if (status != NOERROR) {
+      LOG_WARNING("DnsQuery_A failed with status %lX.\n", status);
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    for (PDNS_RECORDA curRecord = dnsData; curRecord;
+         curRecord = curRecord->pNext) {
+      // Only records in the answer section are important
+      if (curRecord->Flags.S.Section != DnsSectionAnswer) {
+        continue;
+      }
+      if (curRecord->wType != reqFamily) {
+        continue;
+      }
+
+      aCallback(curRecord);
+    }
+
+    DnsFree(dnsData, DNS_FREE_TYPE::DnsFreeRecordList);
+    return NS_OK;
+  };
+
+  if (aAddressFamily == PR_AF_UNSPEC || aAddressFamily == PR_AF_INET) {
+    callDnsQuery_A(DNS_TYPE_A);
+  }
+
+  if (aAddressFamily == PR_AF_UNSPEC || aAddressFamily == PR_AF_INET6) {
+    callDnsQuery_A(DNS_TYPE_AAAA);
+  }
+  return NS_OK;
+}
+
+bool recordTypeMatchesRequest(uint16_t wType, uint16_t aAddressFamily) {
+  if (aAddressFamily == PR_AF_UNSPEC) {
+    return wType == DNS_TYPE_A || wType == DNS_TYPE_AAAA;
+  }
+  if (aAddressFamily == PR_AF_INET) {
+    return wType == DNS_TYPE_A;
+  }
+  if (aAddressFamily == PR_AF_INET6) {
+    return wType == DNS_TYPE_AAAA;
+  }
+  return false;
+}
+
+static MOZ_ALWAYS_INLINE nsresult _GetTTLData_Windows(const nsACString& aHost,
+                                                      uint32_t* aResult,
+                                                      uint16_t aAddressFamily) {
+  MOZ_ASSERT(!aHost.IsEmpty());
+  MOZ_ASSERT(aResult);
+  if (aAddressFamily != PR_AF_UNSPEC && aAddressFamily != PR_AF_INET &&
+      aAddressFamily != PR_AF_INET6) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  // In order to avoid using ANY records which are not always implemented as a
+  // "Gimme what you have" request in hostname resolvers, we should send A
+  // and/or AAAA requests, based on the address family requested.
+  const DWORD ttlFlags =
+      (DNS_QUERY_STANDARD | DNS_QUERY_NO_NETBT | DNS_QUERY_NO_HOSTS_FILE |
+       DNS_QUERY_NO_MULTICAST | DNS_QUERY_ACCEPT_TRUNCATED_RESPONSE |
+       DNS_QUERY_DONT_RESET_TTL_VALUES);
+  unsigned int ttl = (unsigned int)-1;
+  _CallDnsQuery_A_Windows(
+      aHost, aAddressFamily, ttlFlags,
+      [&ttl, &aHost, aAddressFamily](PDNS_RECORDA curRecord) {
+        if (recordTypeMatchesRequest(curRecord->wType, aAddressFamily)) {
+          ttl = std::min<unsigned int>(ttl, curRecord->dwTtl);
+        } else {
+          LOG("Received unexpected record type %u in response for %s.\n",
+              curRecord->wType, aHost.BeginReading());
+        }
+      });
+
+  if (ttl == (unsigned int)-1) {
+    LOG("No useable TTL found.");
+    return NS_ERROR_FAILURE;
+  }
+
+  *aResult = ttl;
+  return NS_OK;
+}
+
+static MOZ_ALWAYS_INLINE nsresult
+_DNSQuery_A_SingleLabel(const nsACString& aCanonHost, uint16_t aAddressFamily,
+                        uint16_t aFlags, AddrInfo** aAddrInfo) {
+  bool setCanonName = aFlags & nsHostResolver::RES_CANON_NAME;
+  nsAutoCString canonName;
+  const DWORD flags = (DNS_QUERY_STANDARD | DNS_QUERY_NO_MULTICAST |
+                       DNS_QUERY_ACCEPT_TRUNCATED_RESPONSE);
+  nsTArray<NetAddr> addresses;
+
+  _CallDnsQuery_A_Windows(
+      aCanonHost, aAddressFamily, flags, [&](PDNS_RECORDA curRecord) {
+        MOZ_DIAGNOSTIC_ASSERT(curRecord->wType == DNS_TYPE_A ||
+                              curRecord->wType == DNS_TYPE_AAAA);
+        if (setCanonName) {
+          canonName.Assign(curRecord->pName);
+        }
+        NetAddr addr{};
+        addr.inet.family = AF_INET;
+        addr.inet.ip = curRecord->Data.A.IpAddress;
+        addresses.AppendElement(addr);
+      });
+
+  LOG("Query for: %s has %zu results", aCanonHost.BeginReading(),
+      addresses.Length());
+  if (addresses.IsEmpty()) {
+    return NS_ERROR_UNKNOWN_HOST;
+  }
+  RefPtr<AddrInfo> ai(new AddrInfo(
+      aCanonHost, canonName, DNSResolverType::Native, 0, std::move(addresses)));
+  ai.forget(aAddrInfo);
+
+  return NS_OK;
+}
+
+#endif
+
+////////////////////////////////////
+// PORTABLE RUNTIME IMPLEMENTATION//
+////////////////////////////////////
+
+static MOZ_ALWAYS_INLINE nsresult
+_GetAddrInfo_Portable(const nsACString& aCanonHost, uint16_t aAddressFamily,
+                      uint16_t aFlags, AddrInfo** aAddrInfo) {
+  MOZ_ASSERT(!aCanonHost.IsEmpty());
+  MOZ_ASSERT(aAddrInfo);
+
+  // We accept the same aFlags that nsHostResolver::ResolveHost accepts, but we
+  // need to translate the aFlags into a form that PR_GetAddrInfoByName
+  // accepts.
+  int prFlags = PR_AI_ADDRCONFIG;
+  if (!(aFlags & nsHostResolver::RES_CANON_NAME)) {
+    prFlags |= PR_AI_NOCANONNAME;
+  }
+
+  // We need to remove IPv4 records manually because PR_GetAddrInfoByName
+  // doesn't support PR_AF_INET6.
+  bool disableIPv4 = aAddressFamily == PR_AF_INET6;
+  if (disableIPv4) {
+    aAddressFamily = PR_AF_UNSPEC;
+  }
+
+#if defined(DNSQUERY_AVAILABLE)
+  if (StaticPrefs::network_dns_dns_query_single_label() &&
+      !aCanonHost.Contains('.') && aCanonHost != "localhost"_ns) {
+    // For some reason we can't use DnsQuery_A to get the computer's IP.
+    if (!aCanonHost.Equals(nsDependentCString(sDNSComputerName),
+                           nsCaseInsensitiveCStringComparator) &&
+        !aCanonHost.Equals(nsDependentCString(sNETBIOSComputerName),
+                           nsCaseInsensitiveCStringComparator)) {
+      // This is a single label name resolve without a dot.
+      // We use DNSQuery_A for these.
+      LOG("Resolving %s using DnsQuery_A (computername: %s)\n",
+          aCanonHost.BeginReading(), sDNSComputerName);
+      return _DNSQuery_A_SingleLabel(aCanonHost, aAddressFamily, aFlags,
+                                     aAddrInfo);
+    }
+  }
+#endif
+
+  LOG("Resolving %s using PR_GetAddrInfoByName", aCanonHost.BeginReading());
+  PRAddrInfo* prai =
+      PR_GetAddrInfoByName(aCanonHost.BeginReading(), aAddressFamily, prFlags);
+
+  if (!prai) {
+    LOG("PR_GetAddrInfoByName returned null PR_GetError:%d PR_GetOSErrpr:%d",
+        PR_GetError(), PR_GetOSError());
+    return NS_ERROR_UNKNOWN_HOST;
+  }
+
+  nsAutoCString canonName;
+  if (aFlags & nsHostResolver::RES_CANON_NAME) {
+    canonName.Assign(PR_GetCanonNameFromAddrInfo(prai));
+  }
+
+  bool filterNameCollision =
+      !(aFlags & nsHostResolver::RES_ALLOW_NAME_COLLISION);
+  RefPtr<AddrInfo> ai(new AddrInfo(aCanonHost, prai, disableIPv4,
+                                   filterNameCollision, canonName));
+  PR_FreeAddrInfo(prai);
+  if (ai->Addresses().IsEmpty()) {
+    LOG("PR_GetAddrInfoByName returned empty address list");
+    return NS_ERROR_UNKNOWN_HOST;
+  }
+
+  ai.forget(aAddrInfo);
+
+  LOG("PR_GetAddrInfoByName resolved successfully");
+  return NS_OK;
+}
+
+//////////////////////////////////////
+// COMMON/PLATFORM INDEPENDENT CODE //
+//////////////////////////////////////
+nsresult GetAddrInfoInit() {
+  LOG("Initializing GetAddrInfo.\n");
+
+#ifdef DNSQUERY_AVAILABLE
+  DWORD namesize = COMPUTER_NAME_BUFFER_SIZE;
+  if (!GetComputerNameExA(ComputerNameDnsHostname, sDNSComputerName,
+                          &namesize)) {
+    sDNSComputerName[0] = 0;
+  }
+  namesize = MAX_COMPUTERNAME_LENGTH + 1;
+  if (!GetComputerNameExA(ComputerNameNetBIOS, sNETBIOSComputerName,
+                          &namesize)) {
+    sNETBIOSComputerName[0] = 0;
+  }
+#endif
+  return NS_OK;
+}
+
+nsresult GetAddrInfoShutdown() {
+  LOG("Shutting down GetAddrInfo.\n");
+  return NS_OK;
+}
+
+bool FindAddrOverride(const nsACString& aHost, uint16_t aAddressFamily,
+                      uint16_t aFlags, AddrInfo** aAddrInfo) {
+  RefPtr<NativeDNSResolverOverride> overrideService = gOverrideService;
+  if (!overrideService) {
+    return false;
+  }
+  AutoReadLock lock(overrideService->mLock);
+  auto overrides = overrideService->mOverrides.Lookup(aHost);
+  if (!overrides) {
+    return false;
+  }
+  nsCString* cname = nullptr;
+  if (aFlags & nsHostResolver::RES_CANON_NAME) {
+    cname = overrideService->mCnames.Lookup(aHost).DataPtrOrNull();
+  }
+
+  RefPtr<AddrInfo> ai;
+
+  nsTArray<NetAddr> addresses;
+  for (const auto& ip : *overrides) {
+    if (aAddressFamily != AF_UNSPEC && ip.raw.family != aAddressFamily) {
+      continue;
+    }
+    addresses.AppendElement(ip);
+  }
+
+  if (!cname) {
+    ai = new AddrInfo(aHost, DNSResolverType::Native, 0, std::move(addresses));
+  } else {
+    ai = new AddrInfo(aHost, *cname, DNSResolverType::Native, 0,
+                      std::move(addresses));
+  }
+
+  ai.forget(aAddrInfo);
+  return true;
+}
+
+nsresult GetAddrInfo(const nsACString& aHost, uint16_t aAddressFamily,
+                     uint16_t aFlags, AddrInfo** aAddrInfo, bool aGetTtl) {
+  if (NS_WARN_IF(aHost.IsEmpty()) || NS_WARN_IF(!aAddrInfo)) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  *aAddrInfo = nullptr;
+
+  if (StaticPrefs::network_dns_disabled()) {
+    return NS_ERROR_UNKNOWN_HOST;
+  }
+
+#ifdef DNSQUERY_AVAILABLE
+  // The GetTTLData needs the canonical name to function properly
+  if (aGetTtl) {
+    aFlags |= nsHostResolver::RES_CANON_NAME;
+  }
+#endif
+
+  // If there is an override for this host, then we synthetize a result.
+  if (gOverrideService &&
+      FindAddrOverride(aHost, aAddressFamily, aFlags, aAddrInfo)) {
+    LOG("Returning IP address from NativeDNSResolverOverride");
+    return (*aAddrInfo)->Addresses().Length() ? NS_OK : NS_ERROR_UNKNOWN_HOST;
+  }
+
+  nsAutoCString host;
+  if (StaticPrefs::network_dns_copy_string_before_call()) {
+    host = Substring(aHost.BeginReading(), aHost.Length());
+    MOZ_ASSERT(aHost.BeginReading() != host.BeginReading());
+  } else {
+    host = aHost;
+  }
+
+  if (gNativeIsLocalhost) {
+    // pretend we use the given host but use IPv4 localhost instead!
+    host = "localhost"_ns;
+    aAddressFamily = PR_AF_INET;
+  }
+
+  RefPtr<AddrInfo> info;
+  nsresult rv =
+      _GetAddrInfo_Portable(host, aAddressFamily, aFlags, getter_AddRefs(info));
+
+#ifdef DNSQUERY_AVAILABLE
+  if (aGetTtl && NS_SUCCEEDED(rv)) {
+    // Figure out the canonical name, or if that fails, just use the host name
+    // we have.
+    nsAutoCString name;
+    if (info && !info->CanonicalHostname().IsEmpty()) {
+      name = info->CanonicalHostname();
+    } else {
+      name = host;
+    }
+
+    LOG("Getting TTL for %s (cname = %s).", host.get(), name.get());
+    uint32_t ttl = 0;
+    nsresult ttlRv = _GetTTLData_Windows(name, &ttl, aAddressFamily);
+    if (NS_SUCCEEDED(ttlRv)) {
+      auto builder = info->Build();
+      builder.SetTTL(ttl);
+      info = builder.Finish();
+      LOG("Got TTL %u for %s (name = %s).", ttl, host.get(), name.get());
+    } else {
+      LOG_WARNING("Could not get TTL for %s (cname = %s).", host.get(),
+                  name.get());
+    }
+  }
+#endif
+
+  info.forget(aAddrInfo);
+  return rv;
+}
+
+// static
+already_AddRefed<nsINativeDNSResolverOverride>
+NativeDNSResolverOverride::GetSingleton() {
+  if (nsIOService::UseSocketProcess() && XRE_IsParentProcess()) {
+    return NativeDNSResolverOverrideParent::GetSingleton();
+  }
+
+  if (gOverrideService) {
+    return do_AddRef(gOverrideService);
+  }
+
+  gOverrideService = new NativeDNSResolverOverride();
+  ClearOnShutdown(&gOverrideService);
+  return do_AddRef(gOverrideService);
+}
+
+NS_IMPL_ISUPPORTS(NativeDNSResolverOverride, nsINativeDNSResolverOverride)
+
+NS_IMETHODIMP NativeDNSResolverOverride::AddIPOverride(
+    const nsACString& aHost, const nsACString& aIPLiteral) {
+  NetAddr tempAddr;
+
+  if (aIPLiteral.Equals("N/A"_ns)) {
+    AutoWriteLock lock(mLock);
+    auto& overrides = mOverrides.LookupOrInsert(aHost);
+    overrides.Clear();
+    return NS_OK;
+  }
+
+  if (NS_FAILED(tempAddr.InitFromString(aIPLiteral))) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  AutoWriteLock lock(mLock);
+  auto& overrides = mOverrides.LookupOrInsert(aHost);
+  overrides.AppendElement(tempAddr);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP NativeDNSResolverOverride::SetCnameOverride(
+    const nsACString& aHost, const nsACString& aCNAME) {
+  if (aCNAME.IsEmpty()) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  AutoWriteLock lock(mLock);
+  mCnames.InsertOrUpdate(aHost, nsCString(aCNAME));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP NativeDNSResolverOverride::ClearHostOverride(
+    const nsACString& aHost) {
+  AutoWriteLock lock(mLock);
+  mCnames.Remove(aHost);
+  auto overrides = mOverrides.Extract(aHost);
+  if (!overrides) {
+    return NS_OK;
+  }
+
+  overrides->Clear();
+  return NS_OK;
+}
+
+NS_IMETHODIMP NativeDNSResolverOverride::ClearOverrides() {
+  AutoWriteLock lock(mLock);
+  mOverrides.Clear();
+  mCnames.Clear();
+  return NS_OK;
+}
+
+}  // namespace mozilla::net