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(RHEL-30645) resolved: never return ::1 when localhost or local hostname is resolved while IPv6 is off in the kernel #438

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(RHEL-30645) resolved: never return ::1 when localhost or local hostname is resolved while IPv6 is off in the kernel #438

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Commits on Apr 23, 2024

  1. sysctl-util: use read_full_virtual_file() for reading sysctls 

    Given these files are part of procfs, let's use the correct API calls
for reading them.

This changes one occasion of read_one_line_file() to
read_full_virtual_file(), which superficially is a different thing, but
shouldn't actually be a difference, since sysctls can't be longer than
4K anyway, and the piecemeal logic behind read_one_line_file() cannot
work with the special semantics of procfs anyway.

(cherry picked from commit 4b30f2e)

Related: RHEL-30645
    @poettering @jacekmigacz
    poettering authored and jacekmigacz committed Apr 23, 2024
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  2. basic: move shared/sysctl-util.[ch] → basic/ 

    This is self-contained ans allows us later to use the provided APIs from
other code in src/basic/

(cherry picked from commit b0ffd27)

Related: RHEL-30645
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    poettering authored and jacekmigacz committed Apr 23, 2024
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  3. socket-util: cache result of socket_ipv6_is_supported() 

    And while we are at it, log about unexpected errors.

(cherry picked from commit 571ec99)

Related: RHEL-30645
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    poettering authored and jacekmigacz committed Apr 23, 2024
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  4. socket-util: add helper for checking if IPv6 is enabled 

    (cherry picked from commit 83e03c4)

Related: RHEL-30645
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    poettering authored and jacekmigacz committed Apr 23, 2024
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  5. resolved: never return ::1 when localhost or local hostname is resolv… 

    …ed while IPv6 is off in the kernel

(cherry picked from commit 747b596)

Resolves: RHEL-30645
    @poettering @jacekmigacz
    poettering authored and jacekmigacz committed Apr 23, 2024
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  6. sysctl-util: add sysctl_read_ip_property() 

    (cherry picked from commit a6b3b0a)

Related: RHEL-30645
    @yuwata @jacekmigacz
    yuwata authored and jacekmigacz committed Apr 23, 2024
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  7. nss-myhostname: do not return IPv6 local address if IPv6 is disabled 

    (cherry picked from commit db50d32)

Related: RHEL-30645
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    yuwata authored and jacekmigacz committed Apr 23, 2024
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  8. nss-myhostname: unify code that handles NOT_FOUND case 

    Just some minor rework to make this more like nss-resolve.

(cherry picked from commit e09e7ac)

Related: RHEL-30645
    @poettering @jacekmigacz
    poettering authored and jacekmigacz committed Apr 23, 2024
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  9. resolved: if ipv6 is off patch hostname→address query with unspec fam… 

    …ily to ipv4

If the client never specified the address family, and IPv6 is off in the
kernel, then look only for A, never for AAAA RRs.

(cherry picked from commit 0438aa57751559295fee86d1c1f176486e518455)

Related: RHEL-30645
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    poettering authored and jacekmigacz committed Apr 23, 2024
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  10. test: do not accept IPv6 local address if IPv6 is disabled 

    (cherry picked from commit bb78da1)

Related: RHEL-30645
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    yuwata authored and jacekmigacz committed Apr 23, 2024
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  11. socket-util: initialize variable with cleanup attribute 

    (cherry picked from commit f96f5d5)

Related: RHEL-30645
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    yuwata authored and jacekmigacz committed Apr 23, 2024
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