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nss_dns: Do not use deprecated packet parsing functions

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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2021-07-15 08:28:50 +02:00
parent 389c1114d1
commit 2ff32dd492
2 changed files with 20 additions and 21 deletions
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13
resolv/nss_dns/dns-canon.c
View File

@ -150,15 +150,18 @@ _nss_dns_getcanonname_r (const char *name, char *buffer, size_t buflen,
if (type != ns_t_cname)
goto unavail;
if (__ns_get16 (ptr) != ns_c_in)
uint16_t rrclass;
NS_GET16 (rrclass, ptr);
if (rrclass != ns_c_in)
goto unavail;
/* Also skip over class and TTL. */
ptr += sizeof (uint16_t) + sizeof (uint32_t);
/* Skip over TTL. */
ptr += sizeof (uint32_t);
/* Skip over RDATA length and RDATA itself. */
uint16_t rdatalen = __ns_get16 (ptr);
ptr += sizeof (uint16_t);
uint16_t rdatalen;
NS_GET16 (rdatalen, ptr);
/* Not enough room for RDATA. */
if (endptr - ptr < rdatalen)
goto unavail;

28
resolv/nss_dns/dns-host.c
View File

@ -782,14 +782,11 @@ getanswer_r (struct resolv_context *ctx,
continue;
}
type = __ns_get16 (cp);
cp += INT16SZ; /* type */
class = __ns_get16 (cp);
cp += INT16SZ; /* class */
int32_t ttl = __ns_get32 (cp);
cp += INT32SZ; /* TTL */
n = __ns_get16 (cp);
cp += INT16SZ; /* len */
NS_GET16 (type, cp);
NS_GET16 (class, cp);
int32_t ttl;
NS_GET32 (ttl, cp);
NS_GET16 (n, cp); /* RDATA length. */
if (end_of_message - cp < n)
{
@ -1116,14 +1113,13 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
continue;
}
int type = __ns_get16 (cp);
cp += INT16SZ; /* type */
int class = __ns_get16 (cp);
cp += INT16SZ; /* class */
int32_t ttl = __ns_get32 (cp);
cp += INT32SZ; /* TTL */
n = __ns_get16 (cp);
cp += INT16SZ; /* len */
uint16_t type;
NS_GET16 (type, cp);
uint16_t class;
NS_GET16 (class, cp);
int32_t ttl;
NS_GET32 (ttl, cp);
NS_GET16 (n, cp); /* RDATA length. */
if (end_of_message - cp < n)
{