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by 2bluesc
261 days ago
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You can use the linker to preload `nss_wrapper`[0] and overwrite anything using `nss`. Here's an example: > cat hosts
198.51.100.33 test.tld
2001:db8::33 test.tld
198.51.100.12 test4.tld
2001:db8::12 test6.tld
> LD_PRELOAD=/nix/store/sw2r0gpi9c9rsvqgvi4906yxh948ydsv-nss_wrapper-1.1.16/lib/libnss_wrapper.so NSS_WRAPPER_HOSTS=hosts getent ahosts test.tld
198.51.100.33 DGRAM test.tld
198.51.100.33 STREAM test.tld
2001:db8::33 DGRAM
2001:db8::33 STREAM
> LD_PRELOAD=/nix/store/sw2r0gpi9c9rsvqgvi4906yxh948ydsv-nss_wrapper-1.1.16/lib/libnss_wrapper.so NSS_WRAPPER_HOSTS=hosts getent ahosts test4.tld
198.51.100.12 DGRAM test4.tld
198.51.100.12 STREAM test4.tld
> LD_PRELOAD=/nix/store/sw2r0gpi9c9rsvqgvi4906yxh948ydsv-nss_wrapper-1.1.16/lib/libnss_wrapper.so NSS_WRAPPER_HOSTS=hosts getent ahosts test6.tld
2001:db8::12 DGRAM test6.tld
2001:db8::12 STREAM test6.tld
> LD_PRELOAD=/nix/store/sw2r0gpi9c9rsvqgvi4906yxh948ydsv-nss_wrapper-1.1.16/lib/libnss_wrapper.so NSS_WRAPPER_HOSTS=hosts curl -v test.tld
* Host test.tld:80 was resolved.
* IPv6: 2001:db8::33
* IPv4: 198.51.100.33
* Trying [2001:db8::33]:80...
* Trying 198.51.100.33:80...
[0] https://cwrap.org/nss_wrapper.html |
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