diff options
Diffstat (limited to 'src/rfc1035.c')
| -rw-r--r-- | src/rfc1035.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/rfc1035.c b/src/rfc1035.c index bdeb3fb..75c4266 100644 --- a/src/rfc1035.c +++ b/src/rfc1035.c @@ -1328,6 +1328,43 @@ int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name, return 0; } +int check_for_ignored_address(struct dns_header *header, size_t qlen, struct bogus_addr *baddr) +{ + unsigned char *p; + int i, qtype, qclass, rdlen; + struct bogus_addr *baddrp; + + /* skip over questions */ + if (!(p = skip_questions(header, qlen))) + return 0; /* bad packet */ + + for (i = ntohs(header->ancount); i != 0; i--) + { + if (!(p = skip_name(p, header, qlen, 10))) + return 0; /* bad packet */ + + GETSHORT(qtype, p); + GETSHORT(qclass, p); + p += 4; /* TTL */ + GETSHORT(rdlen, p); + + if (qclass == C_IN && qtype == T_A) + { + if (!CHECK_LEN(header, p, qlen, INADDRSZ)) + return 0; + + for (baddrp = baddr; baddrp; baddrp = baddrp->next) + if (memcmp(&baddrp->addr, p, INADDRSZ) == 0) + return 1; + } + + if (!ADD_RDLEN(header, p, qlen, rdlen)) + return 0; + } + + return 0; +} + int add_resource_record(struct dns_header *header, char *limit, int *truncp, int nameoffset, unsigned char **pp, unsigned long ttl, int *offset, unsigned short type, unsigned short class, char *format, ...) { |