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parse dns header, add support for SSHFP

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13220 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2003-12-14 15:43:10 +00:00
parent 778250998f
commit aacc963b39
1 changed files with 60 additions and 1 deletions
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61
lib/roken/resolve.c
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@@ -71,6 +71,7 @@ static struct stot{
DECL(KEY),
DECL(SRV),
DECL(NAPTR),
DECL(SSHFP),
{NULL, 0}
};
@@ -323,6 +324,36 @@ parse_record(const unsigned char *data, const unsigned char *end_data,
memcpy ((*rr)->u.cert->cert_data, p + 5, cert_len);
break;
}
case T_SSHFP : {
size_t sshfp_len;
unsigned type;
if (size < 2) {
free(*rr);
return -1;
}
sshfp_len = size - 2;
type = p[1];
if (type != 1 && sshfp_len != 20) /* SHA-1 */ {
free(*rr);
return -1;
}
(*rr)->u.sshfp = malloc (sizeof(*(*rr)->u.sshfp) + sshfp_len - 1);
if ((*rr)->u.sshfp == NULL) {
free(*rr);
return -1;
}
(*rr)->u.sshfp->algorithm = p[0];
(*rr)->u.sshfp->type = p[1];
(*rr)->u.sshfp->sshfp_len = sshfp_len;
memcpy ((*rr)->u.sshfp->sshfp_data, p + 2, sshfp_len);
break;
}
default:
(*rr)->u.data = (unsigned char*)malloc(size);
if(size != 0 && (*rr)->u.data == NULL) {
@@ -356,7 +387,23 @@ parse_reply(const unsigned char *data, size_t len)
p = data;
r->h.id = (p[0] << 8) | p[1];
r->h.misc = (p[2] << 8) | p[3];
r->h.flags = 0;
if (p[2] & 0x01)
r->h.flags |= rk_DNS_HEADER_RESPONSE_FLAG;
r->h.opcode = (p[2] >> 1) & 0xf;
if (p[2] & 0x20)
r->h.flags |= rk_DNS_HEADER_AUTHORITIVE_ANSWER;
if (p[2] & 0x40)
r->h.flags |= rk_DNS_HEADER_TRUNCATED_MESSAGE;
if (p[2] & 0x80)
r->h.flags |= rk_DNS_HEADER_RECURSION_DESIRED;
if (p[3] & 0x01)
r->h.flags |= rk_DNS_HEADER_RECURSION_AVAILABLE;
if (p[3] & 0x04)
r->h.flags |= rk_DNS_HEADER_AUTHORITIVE_ANSWER;
if (p[3] & 0x08)
r->h.flags |= rk_DNS_HEADER_CHECKING_DISABLED;
r->h.response_code = (p[3] >> 4) & 0xf;
r->h.qdcount = (p[4] << 8) | p[5];
r->h.ancount = (p[6] << 8) | p[7];
r->h.nscount = (p[8] << 8) | p[9];
@@ -658,6 +705,18 @@ main(int argc, char **argv)
key->flags, key->protocol, key->algorithm);
break;
}
case T_SSHFP : {
struct sshfp_record *sshfp = rr->u.sshfp;
int i;
printf ("alg %u type %u length %u data ",
sshfp->algorithm, sshfp->type, sshfp->sshfp_len);
for (i = 0; i < sshfp->sshfp_len; i++)
printf("%02X", sshfp->sshfp_data[i]);
printf("\n");
break;
}
default:
printf("\n");
break;