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/*
* Part of DNS zone file validator `validns`.
*
* Copyright 2011-2014 Anton Berezin <tobez@tobez.org>
* Modified BSD license.
* (See LICENSE file in the distribution.)
*
*/
#include <sys/types.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include "common.h"
#include "textparse.h"
#include "mempool.h"
#include "carp.h"
#include "rr.h"
static struct rr *ipseckey_parse(char *name, long ttl, int type, char *s)
{
struct rr_ipseckey *rr = getmem(sizeof(*rr));
int i;
rr->precedence = i = extract_integer(&s, "precedence", NULL);
if (i < 0) return NULL;
if (i >= 256) return bitch("precedence range is not valid");
rr->gateway_type = i = extract_integer(&s, "gateway type", NULL);
if (i < 0) return NULL;
if (i > 3) return bitch("gateway type is not valid");
rr->algorithm = i = extract_integer(&s, "algorithm", NULL);
if (i < 0) return NULL;
if (i > 2) return bitch("algorithm is not valid");
switch (rr->gateway_type) {
case 0:
rr->gateway.gateway_none = extract_name(&s, "gateway/.", KEEP_CAPITALIZATION);
if (!rr->gateway.gateway_none) return NULL;
if (strcmp(rr->gateway.gateway_none, ".") != 0)
return bitch("gateway must be \".\" for gateway type 0");
break;
case 1:
if (extract_ipv4(&s, "gateway/IPv4", &rr->gateway.gateway_ipv4) <= 0)
return NULL;
break;
case 2:
if (extract_ipv6(&s, "gateway/IPv6", &rr->gateway.gateway_ipv6) <= 0)
return NULL;
break;
case 3:
rr->gateway.gateway_name = extract_name(&s, "gateway/name", KEEP_CAPITALIZATION);
if (!rr->gateway.gateway_name) return NULL;
break;
default:
croakx(7, "assertion failed: gateway type %d not within range", rr->gateway_type);
}
/* My reading of http://tools.ietf.org/html/rfc4025 is fuzzy on:
*
* - whether it is possible to have algorithm 0 and non-empty key;
* - whether it is possible to have empty key and algorithm != 0.
*
* Here I assume "not possible" for both.
*/
switch (rr->algorithm) {
case 0:
break;
case 1:
/* DSA key */
rr->public_key = extract_base64_binary_data(&s, "public key");
if (rr->public_key.length < 0) return NULL;
break;
case 2:
/* RSA key */
rr->public_key = extract_base64_binary_data(&s, "public key");
if (rr->public_key.length < 0) return NULL;
break;
default:
croakx(7, "assertion failed: algorithm %d not within range", rr->algorithm);
}
if (*s) {
return bitch("garbage after valid IPSECKEY data");
}
return store_record(type, name, ttl, rr);
}
static char* ipseckey_human(struct rr *rrv)
{
RRCAST(ipseckey);
char s[1024], gw[1000];
switch (rr->gateway_type) {
case 0:
strcpy(gw, rr->gateway.gateway_none);
break;
case 1:
inet_ntop(AF_INET, &rr->gateway.gateway_ipv4, gw, sizeof(gw));
break;
case 2:
inet_ntop(AF_INET6, &rr->gateway.gateway_ipv6, gw, sizeof(gw));
break;
case 3:
strcpy(gw, rr->gateway.gateway_name);
break;
default:
strcpy(gw, "??");
}
snprintf(s, 1024, "( %d %d %d %s ... )",
rr->precedence, rr->gateway_type, rr->algorithm, gw);
return quickstrdup_temp(s);
}
static struct binary_data ipseckey_wirerdata(struct rr *rrv)
{
RRCAST(ipseckey);
struct binary_data helper;
switch (rr->gateway_type) {
case 0:
if (rr->algorithm != 0)
return compose_binary_data("111d", 1,
rr->precedence, rr->gateway_type, rr->algorithm,
rr->public_key);
else
return compose_binary_data("111", 1,
rr->precedence, rr->gateway_type, rr->algorithm);
break;
case 1:
helper.length = sizeof(rr->gateway.gateway_ipv4);
helper.data = (void *)&rr->gateway.gateway_ipv4;
if (rr->algorithm != 0)
return compose_binary_data("111dd", 1,
rr->precedence, rr->gateway_type, rr->algorithm,
helper,
rr->public_key);
else
return compose_binary_data("111d", 1,
rr->precedence, rr->gateway_type, rr->algorithm,
helper);
break;
case 2:
helper.length = sizeof(rr->gateway.gateway_ipv6);
helper.data = (void *)&rr->gateway.gateway_ipv6;
if (rr->algorithm != 0)
return compose_binary_data("111dd", 1,
rr->precedence, rr->gateway_type, rr->algorithm,
helper,
rr->public_key);
else
return compose_binary_data("111d", 1,
rr->precedence, rr->gateway_type, rr->algorithm,
helper);
break;
case 3:
if (rr->algorithm != 0)
return compose_binary_data("111dd", 1,
rr->precedence, rr->gateway_type, rr->algorithm,
name2wire_name(rr->gateway.gateway_name),
rr->public_key);
else
return compose_binary_data("111d", 1,
rr->precedence, rr->gateway_type, rr->algorithm,
name2wire_name(rr->gateway.gateway_name));
break;
}
return bad_binary_data();
}
struct rr_methods ipseckey_methods = { ipseckey_parse, ipseckey_human, ipseckey_wirerdata, NULL, NULL };
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