PostgreSQL Hooks for Fun and Profit
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Injecting DLLs isn't just for malicious crackers. Find out how to make PostgreSQL do neat new tricks by using its built-in hook system.
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PostgreSQL Hooks for Fun and Profit
- 1. HOOKS for Fun and Profit david@fetter.org SCaLE 15x March 2, 2017 http://github.com/davidfetter Tuesday, March 7, 17
- 2. $ whoami Tuesday, March 7, 17
- 3. David Fetter Tuesday, March 7, 17
- 4. David Fetter Husband and father of four Tuesday, March 7, 17
- 5. David Fetter Husband and father of four Long-time PostgreSQL contributor Tuesday, March 7, 17
- 6. David Fetter Husband and father of four Long-time PostgreSQL contributor Expander of SQL Tuesday, March 7, 17
- 7. David Fetter Husband and father of four Long-time PostgreSQL contributor Expander of SQL Happy contractor for OpenSCG at GE Digital Tuesday, March 7, 17
- 8. Rate me! Tuesday, March 7, 17
- 9. Have you ever? Tuesday, March 7, 17
- 10. Have you ever? Tuesday, March 7, 17
- 11. Have you ever? Tuesday, March 7, 17
- 12. Have you ever? Updated or deleted every row Tuesday, March 7, 17
- 13. Have you ever? Updated or deleted every row by accident? Tuesday, March 7, 17
- 14. Have you ever? Updated or deleted every row by accident? Tuesday, March 7, 17
- 15. Have you ever? Updated or deleted every row by accident? Tuesday, March 7, 17
- 16. Have you ever? Updated or deleted every row by accident? Tuesday, March 7, 17
- 17. Have you ever? Wanted to slow people down when they auth too fast Tuesday, March 7, 17
- 18. Have you ever? Tuesday, March 7, 17
- 19. Have you ever? Made a cool constraint Tuesday, March 7, 17
- 20. Have you ever? Made a cool constraint that required SERIALIZABLE Tuesday, March 7, 17
- 21. Have you ever? Wanted to replace our TSP-based planner with one based on simulated annealing Tuesday, March 7, 17
- 22. You could: Updated or deleted from a whole table without meaning to? Lock out everyone who could make a mistake... Tuesday, March 7, 17
- 23. You could Tuesday, March 7, 17
- 24. You could Wanted to slow people down when they auth too fast Tuesday, March 7, 17
- 25. You could Wanted to slow people down when they auth too fast Hope the network layer handles it Tuesday, March 7, 17
- 26. You could Wanted to slow people down when they auth too fast Hope the network layer handles it and isn’t Mallory Tuesday, March 7, 17
- 27. You could Tuesday, March 7, 17
- 28. You could Made a cool constraint Tuesday, March 7, 17
- 29. You could Made a cool constraint that required SERIALIZABLE Tuesday, March 7, 17
- 30. You could Made a cool constraint that required SERIALIZABLE Add a check for that Tuesday, March 7, 17
- 31. You could Made a cool constraint that required SERIALIZABLE Add a check for that in. every. single. trigger. Tuesday, March 7, 17
- 32. You could Wanted to replace our TSP-based planner with one based on simulated annealing Um....er.... Tuesday, March 7, 17
- 33. Hooks to the Rescue! Tuesday, March 7, 17
- 34. Hooks? Tuesday, March 7, 17
- 35. Snag Tuesday, March 7, 17
- 36. Bag Tuesday, March 7, 17
- 37. Act Tuesday, March 7, 17
- 38. Back Tuesday, March 7, 17
- 39. You need to write C Tuesday, March 7, 17
- 40. Tuesday, March 7, 17
- 41. Preamble #include "postgres.h" /* Headers you need start here: */ /* Headers you need end here: */ PG_MODULE_MAGIC; /* Hooking: All hooks start with this. */ void _PG_init(void); /* Unhooking: All hooks end with this. */ void _PG_fini(void); Tuesday, March 7, 17
- 42. Snag/Bag /* * There is a type for each hook. * This is not one of them. * You will need it for hooking and unhooking. */ static System_hook_type prev_system_hook = NULL; void _PG_init(void) { prev_system_hook = System_hook; System_hook = blackhole_hook; } Tuesday, March 7, 17
- 43. Act static void blackhole_hook { /* Your hook code goes here */ } Tuesday, March 7, 17
- 44. Back void _PG_fini(void) { System_hook = prev_system_hook; } Tuesday, March 7, 17
- 45. 82 hooks Tuesday, March 7, 17
- 46. Tuesday, March 7, 17
- 47. You could: Updated or deleted from a whole table without meaning to? Lock out everyone who could make a mistake... Make a simple hook for simple errors Tuesday, March 7, 17
- 48. Boring C Code: Tuesday, March 7, 17
- 49. Live Demo! Tuesday, March 7, 17
- 50. Have you ever? Tuesday, March 7, 17
- 51. Have you ever? Made a cool constraint Tuesday, March 7, 17
- 52. Have you ever? Made a cool constraint that required SERIALIZABLE Tuesday, March 7, 17
- 53. Have you ever? Made a cool constraint that required SERIALIZABLE Tuesday, March 7, 17
- 54. Have you ever? Made a cool constraint that required SERIALIZABLE Make a simple hook! Tuesday, March 7, 17
- 55. You could Tuesday, March 7, 17
- 56. You could Wanted to slow people down when they auth too fast Tuesday, March 7, 17
- 57. You could Wanted to slow people down when they auth too fast Hope the network layer handles it Tuesday, March 7, 17
- 58. You could Wanted to slow people down when they auth too fast Hope the network layer handles it and isn’t Mallory Tuesday, March 7, 17
- 59. You could Wanted to slow people down when they auth too fast Hope the network layer handles it and isn’t Mallory auth_delay (contrib) Tuesday, March 7, 17
- 60. You could Wanted to replace our TSP-based planner with one based on simulated annealing Um....er.... 2313 LoC later: Wow! Tuesday, March 7, 17
- 61. Questions? Tuesday, March 7, 17
- 62. tl;dr Tuesday, March 7, 17
- 63. tl;dr • Lots has already been done Tuesday, March 7, 17
- 64. tl;dr • Lots has already been done • Your imagination is the main limit Tuesday, March 7, 17
- 65. tl;dr • Lots has already been done • Your imagination is the main limit • Have fun! Tuesday, March 7, 17
- 66. Thank you! Tuesday, March 7, 17