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Fix host name resolution with Asio 1.34+ - #7816
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Review comments at @libs/core/asio/src/asio_util.cpp:
- Around line 145-148: Update the IPv4-filtering flow around the endpoint
iterator and force_ipv4 handling to check whether filtering reaches end before
the existing assertion or dereference. Report the appropriate resolution error
and return safely when no IPv4 endpoint exists, while preserving the current
behavior for successful resolution.
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libs/core/asio/src/asio_util.cpplibs/core/asio/tests/unit/CMakeLists.txtlibs/core/asio/tests/unit/resolve_hostname.cpp
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resolve_hostname initialized 'end' with begin(), so the IPv4 results were always skipped and only the IPv6 lookup was used; hosts without an IPv6 address failed to resolve. The IPv4-then-IPv6 fallback used in all resolver call sites could not work either, since resolve() with a protocol throws when there are no results instead of returning an empty range. Resolve all address families again (with address_configured, the default of the old resolver::query) and skip non-IPv4 entries only when force_ipv4 is set. Add a unit test for resolve_hostname, connect_begin and accept_begin. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Akagra Mishra <224018956+akagramishra@users.noreply.github.com>
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hkaiser
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Thanks, the fix looks right. With end initialized from begin() the IPv4 results were never used, and since resolve() with a protocol throws instead of returning an empty range, the IPv4-then-IPv6 fallback couldn't work at any of the call sites. Resolving all families with address_configured and skipping non-IPv4 entries only for force_ipv4 makes the 1.34+ branch behave exactly like the pre-1.34 one, where address_configured was the default flag of resolver::query. I built it on Windows against Asio 1.36.0: the new test and the 2-locality TCP barrier test pass.
The failing jobs are unrelated: macOS (Debug) with Boost fetch fails only on the counting_semaphore_cpp20 timeout, macOS (Debug) was cancelled after 6 hours, and the HWLoc fetch and CodeQL jobs fail at the CMake generate step on the fetched hwloc, which #7821 fixed on master since.
Restore the release notes update that was lost when release-2.0.X was rebuilt on master eaff5b9, and describe the PRs merged since the previous rebuild (#6514, #7767, #7816, #7817, #7819, #7821, #7824, #7831). Regenerate the closed issue and pull request lists for release-2.0.X at 4cb902e against the v1.11.0 tag (775 PRs, 167 issues). Signed-off-by: Hartmut Kaiser <hartmut.kaiser@gmail.com>
Restore the release notes update that was lost when release-2.0.X was rebuilt on master eaff5b9, and describe the PRs merged since the previous rebuild (#6514, #7767, #7816, #7817, #7819, #7821, #7824, #7831). Regenerate the closed issue and pull request lists for release-2.0.X at 4cb902e against the v1.11.0 tag (775 PRs, 167 issues). Signed-off-by: Hartmut Kaiser <hartmut.kaiser@gmail.com>
Follow-up to f073c54 (the Asio 1.34 changes for #6747).
Proposed Changes
resolve_hostname:endwas initialized withbegin(), so the IPv4 results were always skipped and only the IPv6 lookup was used. Hosts without an IPv6 address failed to resolve.address_configured, which was the default of the oldresolver::query) and only skip non-IPv4 entries whenforce_ipv4is set. The IPv4-then-IPv6 fallback couldn't work anyway, sinceresolve()with a protocol throws when there are no results instead of returning an empty range.resolve_hostname,connect_beginandaccept_begin.Any background context you want to provide?
Found while updating Asio in vcpkg (microsoft/vcpkg#54423), which carries this fix as a patch for now.
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