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58 lines
2.1 KiB
58 lines
2.1 KiB
commit 4d2e67d6e5c910114dbccd17d9b93f06552c0024 |
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Author: Florian Weimer <fweimer@redhat.com> |
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Date: Tue Aug 30 10:02:49 2022 +0200 |
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resolv: Add internal __res_binary_hnok function |
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During package parsing, only the binary representation is available, |
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and it is convenient to check that directly for conformance with host |
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name requirements. |
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> |
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(cherry picked from commit c79327bf00a4be6d60259227acc78ef80ead3622) |
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diff --git a/include/resolv.h b/include/resolv.h |
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index 3590b6f496d47710..4dbbac3800b7ef30 100644 |
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--- a/include/resolv.h |
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+++ b/include/resolv.h |
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@@ -70,5 +70,8 @@ libc_hidden_proto (__libc_res_nameinquery) |
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extern __typeof (__res_queriesmatch) __libc_res_queriesmatch; |
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libc_hidden_proto (__libc_res_queriesmatch) |
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+/* Variant of res_hnok which operates on binary (but uncompressed) names. */ |
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+bool __res_binary_hnok (const unsigned char *dn) attribute_hidden; |
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+ |
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# endif /* _RESOLV_H_ && !_ISOMAC */ |
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#endif |
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diff --git a/resolv/res-name-checking.c b/resolv/res-name-checking.c |
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index 2c603494fa3ca992..513ddb5f6b12ccb0 100644 |
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--- a/resolv/res-name-checking.c |
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+++ b/resolv/res-name-checking.c |
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@@ -138,6 +138,12 @@ binary_leading_dash (const unsigned char *dn) |
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return dn[0] > 0 && dn[1] == '-'; |
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} |
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+bool |
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+__res_binary_hnok (const unsigned char *dn) |
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+{ |
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+ return !binary_leading_dash (dn) && binary_hnok (dn); |
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+} |
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+ |
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/* Return 1 if res_hnok is a valid host name. Labels must only |
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contain [0-9a-zA-Z_-] characters, and the name must not start with |
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a '-'. The latter is to avoid confusion with program options. */ |
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@@ -145,11 +151,9 @@ int |
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___res_hnok (const char *dn) |
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{ |
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unsigned char buf[NS_MAXCDNAME]; |
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- if (!printable_string (dn) |
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- || __ns_name_pton (dn, buf, sizeof (buf)) < 0 |
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- || binary_leading_dash (buf)) |
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- return 0; |
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- return binary_hnok (buf); |
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+ return (printable_string (dn) |
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+ && __ns_name_pton (dn, buf, sizeof (buf)) >= 0 |
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+ && __res_binary_hnok (buf)); |
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} |
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versioned_symbol (libc, ___res_hnok, res_hnok, GLIBC_2_34); |
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versioned_symbol (libc, ___res_hnok, __libc_res_hnok, GLIBC_PRIVATE);
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