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59 lines
2.1 KiB
59 lines
2.1 KiB
2 years ago
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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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