aws: add support for EKS Pod Identities

[PettitWesley]

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Testing
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• Example configuration file for the change
• Debug log output from testing the change

• Attached Valgrind output that shows no leaks or memory corruption was found

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• Run local packaging test showing all targets (including any new ones) build.
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• Backport to latest stable release.

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[PettitWesley]

@edsiper I tested these changes thoroughly on a new EKS cluster back in May. My change has unit tests which pass. It should be safe to merge after I just now performed a simple rebase with no conflicts. Unfortunately I am unable test this again right now.

Please see my comments on the alternate (mostly the same) implementation: #9013 (review)

[edsiper]

@PettitWesley there are some memory leaks detected in the unit test:

https://github.com/fluent/fluent-bit/actions/runs/10381178881/job/28776004954?pr=9206#step:5:3421

[edsiper]

@PettitWesley @iandrewt

In the branch eks-pod-identity3.0 I pushed some commits on top of this branch/PR to fix the leaks found. The patch in order are:

• d7a7668 aws: fix leaks on new EKS Pod identities
• f0e6f2b utils: validate sds port
• ec2209c tests: internal: aws_credentials_http: fix leaks

Remaining issues found with Valgrind:

valgrind --leak-check=full bin/flb-it-aws_credentials_http

Test test_http_validator_invalid_host...        [ FAILED ]
  aws_credentials_http.c:728: Check provider == NULL... failed
==964174== Warning: invalid file descriptor -1 in syscall close()
Test test_http_validator_invalid_port...        [ FAILED ]
  aws_credentials_http.c:757: Check provider == NULL... failed
==964174== Warning: invalid file descriptor -1 in syscall close()
FAILED: 2 of 11 unit tests have failed.
==964174==
==964174== HEAP SUMMARY:
==964174==     in use at exit: 19,024 bytes in 9 blocks
==964174==   total heap usage: 17,168 allocs, 17,159 frees, 1,808,409 bytes allocated
==964174==
==964174== 212 (96 direct, 116 indirect) bytes in 1 blocks are definitely lost in loss record 7 of 9
==964174==    at 0x484D953: calloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==964174==    by 0x16D064: flb_calloc (include/fluent-bit/flb_mem.h:95)
==964174==    by 0x16D47F: flb_endpoint_provider_create (src/aws/flb_aws_credentials_http.c:265)
==964174==    by 0x16DA26: flb_http_provider_create (src/aws/flb_aws_credentials_http.c:394)
==964174==    by 0x162EDD: test_http_validator_invalid_host (tests/internal/aws_credentials_http.c:727)
==964174==    by 0x1609B7: acutest_do_run_ (tests/internal/../lib/acutest/acutest.h:1034)
==964174==    by 0x15F68D: acutest_run_ (tests/internal/../lib/acutest/acutest.h:1205)
==964174==    by 0x15E329: main (tests/internal/../lib/acutest/acutest.h:1769)
==964174==
==964174== 212 (96 direct, 116 indirect) bytes in 1 blocks are definitely lost in loss record 8 of 9
==964174==    at 0x484D953: calloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==964174==    by 0x16D064: flb_calloc (include/fluent-bit/flb_mem.h:95)
==964174==    by 0x16D47F: flb_endpoint_provider_create (src/aws/flb_aws_credentials_http.c:265)
==964174==    by 0x16DA26: flb_http_provider_create (src/aws/flb_aws_credentials_http.c:394)
==964174==    by 0x163053: test_http_validator_invalid_port (tests/internal/aws_credentials_http.c:756)
==964174==    by 0x1609B7: acutest_do_run_ (tests/internal/../lib/acutest/acutest.h:1034)
==964174==    by 0x15F68D: acutest_run_ (tests/internal/../lib/acutest/acutest.h:1205)
==964174==    by 0x15E329: main (tests/internal/../lib/acutest/acutest.h:1769)
==964174==
==964174== 18,600 bytes in 1 blocks are definitely lost in loss record 9 of 9
==964174==    at 0x484D953: calloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==964174==    by 0x15F8C4: flb_calloc (include/fluent-bit/flb_mem.h:95)
==964174==    by 0x162E6F: test_http_validator_invalid_host (tests/internal/aws_credentials_http.c:722)
==964174==    by 0x1609B7: acutest_do_run_ (tests/internal/../lib/acutest/acutest.h:1034)
==964174==    by 0x15F68D: acutest_run_ (tests/internal/../lib/acutest/acutest.h:1205)
==964174==    by 0x15E329: main (tests/internal/../lib/acutest/acutest.h:1769)
==964174==
==964174== LEAK SUMMARY:
==964174==    definitely lost: 18,792 bytes in 3 blocks
==964174==    indirectly lost: 232 bytes in 6 blocks
==964174==      possibly lost: 0 bytes in 0 blocks
==964174==    still reachable: 0 bytes in 0 blocks
==964174==         suppressed: 0 bytes in 0 blocks
==964174==

just trying to speed up things, can you pls review the commits and cherry-pick them ?

[edsiper]

moving this for 3.2. we need someone to incorporate the changes