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IPSECKEY wireformat parsing

This commit is contained in:
Willem Toorop 2015-02-18 23:36:32 +01:00
parent 9b90ced595
commit e845ffa3bf
1 changed files with 87 additions and 1 deletions
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88
src/rr-dict.c
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@ -106,6 +106,92 @@ static priv_getdns_rdf_special apl_afdpart = {
apl_afdpart_dict_set_value, apl_afdpart_list_append_value
};
static uint8_t *
ipseckey_gateway_rdf_end(uint8_t *pkt, uint8_t *pkt_end, uint8_t *rdf)
{
uint8_t *end;
if (rdf - 5 < pkt)
return NULL;
switch (rdf[-2]) {
case 0: end = rdf;
break;
case 1: end = rdf + 4;
break;
case 2: end = rdf + 16;
break;
case 3: for (end = rdf; end < pkt_end; end += *end + 1)
if ((*end & 0xC0) == 0xC0)
end += 2;
else if (*end & 0xC0)
return NULL;
else if (!*end) {
end += 1;
break;
}
break;
default:
return NULL;
}
return end <= pkt_end ? end : NULL;
}
static getdns_return_t
ipseckey_gateway_equip_bindata(uint8_t *rdf, getdns_bindata *bindata)
{
bindata->data = rdf;
switch (rdf[-2]) {
case 0: bindata->size = 0;
break;
case 1: bindata->size = 4;
break;
case 2: bindata->size = 16;
break;
case 3: while (*rdf)
if ((*rdf & 0xC0) == 0xC0)
rdf += 2;
else if (*rdf & 0xC0)
return GETDNS_RETURN_GENERIC_ERROR;
else
rdf += *rdf + 1;
bindata->size = rdf + 1 - bindata->data;
break;
default:
return GETDNS_RETURN_GENERIC_ERROR;
}
return GETDNS_RETURN_GOOD;
}
static getdns_return_t
ipseckey_gateway_dict_set_value(getdns_dict *dict, uint8_t *rdf)
{
getdns_bindata bindata;
if (ipseckey_gateway_equip_bindata(rdf, &bindata))
return GETDNS_RETURN_GENERIC_ERROR;
else if (! bindata.size)
return GETDNS_RETURN_GOOD;
else
return getdns_dict_set_bindata(dict, "gateway", &bindata);
}
static getdns_return_t
ipseckey_gateway_list_append_value(getdns_list *list, uint8_t *rdf)
{
getdns_bindata bindata;
if (ipseckey_gateway_equip_bindata(rdf, &bindata))
return GETDNS_RETURN_GENERIC_ERROR;
else if (! bindata.size)
return GETDNS_RETURN_GOOD;
else
return getdns_list_append_bindata(list, &bindata);
}
static priv_getdns_rdf_special ipseckey_gateway = {
ipseckey_gateway_rdf_end,
ipseckey_gateway_dict_set_value, ipseckey_gateway_list_append_value
};
static priv_getdns_rdata_def a_rdata[] = {
{ "ipv4_address" , GETDNS_RDF_A }};
static priv_getdns_rdata_def ns_rdata[] = {
@ -228,7 +314,7 @@ static priv_getdns_rdata_def ipseckey_rdata[] = {
{ "algorithm" , GETDNS_RDF_I1 },
{ "gateway_type" , GETDNS_RDF_I1 },
{ "precedence" , GETDNS_RDF_I1 },
{ "gateway" , GETDNS_RDF_SPECIAL, NULL },
{ "gateway" , GETDNS_RDF_SPECIAL, &ipseckey_gateway },
{ "public_key" , GETDNS_RDF_B }};
static priv_getdns_rdata_def rrsig_rdata[] = {
{ "type_covered" , GETDNS_RDF_I2 },