Skip res_doh_send() if there is no validated DoH servers

Since res_doh_send() can take around 2 milliseconds, skip calling
it when there is no DoH servers validated.

Bug: 212364676
Test: ran "dnschk --attempts 1000 --randomname"
      w/o this change it takes 36 seconds
      w/ this change it takes 32 seconds
Test: checked the log to ensure that "performing query over Https"
      is not printed when the DNS doesn't support DoH
Change-Id: I1718534889b097eb89ba12a291da0fb19f13bbbd
5 files changed
tree: 7b56904e57cdd4ea59a2cdbc011c6559722fc83a
  1. aidl_api/
  2. apex/
  3. binder/
  4. doh/
  5. include/
  6. tests/
  7. .editorconfig
  8. Android.bp
  9. cbindgen.toml
  10. Dns64Configuration.cpp
  11. Dns64Configuration.h
  12. DnsProxyListener.cpp
  13. DnsProxyListener.h
  14. DnsQueryLog.cpp
  15. DnsQueryLog.h
  16. DnsQueryLogTest.cpp
  17. DnsResolver.cpp
  18. DnsResolver.h
  19. DnsResolverService.cpp
  20. DnsResolverService.h
  21. DnsStats.cpp
  22. DnsStats.h
  23. DnsStatsTest.cpp
  24. DnsTlsDispatcher.cpp
  25. DnsTlsDispatcher.h
  26. DnsTlsQueryMap.cpp
  27. DnsTlsQueryMap.h
  28. DnsTlsServer.cpp
  29. DnsTlsServer.h
  30. DnsTlsSessionCache.cpp
  31. DnsTlsSessionCache.h
  32. DnsTlsSocket.cpp
  33. DnsTlsSocket.h
  34. DnsTlsSocketFactory.h
  35. DnsTlsTransport.cpp
  36. DnsTlsTransport.h
  37. doh.h
  38. Experiments.cpp
  39. Experiments.h
  40. ExperimentsTest.cpp
  41. getaddrinfo.cpp
  42. getaddrinfo.h
  43. gethnamaddr.cpp
  44. gethnamaddr.h
  45. hostent.h
  46. IDnsTlsSocket.h
  47. IDnsTlsSocketFactory.h
  48. IDnsTlsSocketObserver.h
  49. IPrivateDnsServer.h
  50. libnetd_resolv.map.txt
  51. LockedQueue.h
  52. NOTICE
  53. OperationLimiter.h
  54. OperationLimiterTest.cpp
  55. OWNERS
  56. params.h
  57. PREUPLOAD.cfg
  58. PrivateDnsCommon.h
  59. PrivateDnsConfiguration.cpp
  60. PrivateDnsConfiguration.h
  61. PrivateDnsConfigurationTest.cpp
  62. PrivateDnsValidationObserver.h
  63. README-DoT.md
  64. README.md
  65. res_cache.cpp
  66. res_comp.cpp
  67. res_comp.h
  68. res_debug.cpp
  69. res_debug.h
  70. res_mkquery.cpp
  71. res_query.cpp
  72. res_send.cpp
  73. res_send.h
  74. res_stats.cpp
  75. resolv_cache.h
  76. resolv_private.h
  77. resolv_rust_test_config_template.xml
  78. resolv_test_config_template.xml
  79. ResolverController.cpp
  80. ResolverController.h
  81. ResolverEventReporter.cpp
  82. ResolverEventReporter.h
  83. ResolverStats.h
  84. sethostent.cpp
  85. stats.h
  86. stats.proto
  87. TEST_MAPPING
  88. util.cpp
  89. util.h
README.md

Logging

This code uses LOG(X) for logging. Log levels are VERBOSE,DEBUG,INFO,WARNING and ERROR. The default setting is WARNING and logs relate to WARNING and ERROR will be shown. If you want to enable the DEBUG level logs, using following command. adb shell service call dnsresolver 10 i32 1 VERBOSE 0 DEBUG 1 INFO 2 WARNING 3 ERROR 4 Verbose resolver logs could contain PII -- do NOT enable in production builds.