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/*
* BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
*
* (c) 2015 CZ.NIC
* (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
*
* This file was a part of RTRlib: http://rpki.realmv6.org/
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <sys/socket.h>
#include <netdb.h>
#include "rpki.h"
#include "transport.h"
#include "sysdep/unix/unix.h"
/**
* rpki_hostname_autoresolv - auto-resolve an IP address from a hostname
* @host: domain name of host, e.g. "rpki-validator.realmv6.org"
* @err_msg: error message returned in case of errors
*
* This function resolves an IP address from a hostname.
* Returns &ip_addr structure with IP address or |IPA_NONE|.
*/
static ip_addr
rpki_hostname_autoresolv(const char *host, const char **err_msg)
{
struct addrinfo *res;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_ADDRCONFIG,
};
*err_msg = NULL;
if (!host)
return IPA_NONE;
int err_code = getaddrinfo(host, NULL, &hints, &res);
if (err_code != 0)
{
*err_msg = gai_strerror(err_code);
return IPA_NONE;
}
ip_addr addr = IPA_NONE;
uint unused;
sockaddr_read((sockaddr *) res->ai_addr, res->ai_family, &addr, NULL, &unused);
freeaddrinfo(res);
return addr;
}
/**
* rpki_tr_open - prepare and open a socket connection
* @tr: initialized transport socket
*
* Prepare and open a socket connection specified by @tr that must be initialized before.
* This function ends with a calling the sk_open() function.
* Returns RPKI_TR_SUCCESS or RPKI_TR_ERROR.
*/
int
rpki_tr_open(struct rpki_tr_sock *tr)
{
struct rpki_cache *cache = tr->cache;
struct rpki_config *cf = (void *) cache->p->p.cf;
ASSERT(tr->sk == NULL);
tr->sk = sk_new(cache->pool);
sock *sk = tr->sk;
/* sk->type -1 is invalid value, a correct value MUST be set in the specific transport layer in open_fp() hook */
sk->type = -1;
sk->tx_hook = rpki_connected_hook;
sk->err_hook = rpki_err_hook;
sk->data = cache;
sk->daddr = cf->ip;
sk->dport = cf->port;
sk->host = cf->hostname;
sk->rbsize = RPKI_RX_BUFFER_SIZE;
sk->tbsize = RPKI_TX_BUFFER_SIZE;
sk->tos = IP_PREC_INTERNET_CONTROL;
if (ipa_zero(sk->daddr) && sk->host)
{
const char *err_msg;
sk->daddr = rpki_hostname_autoresolv(sk->host, &err_msg);
if (ipa_zero(sk->daddr))
{
log(L_ERR "%s: Cannot resolve hostname '%s': %s",
cache->p->p.name, sk->host, err_msg);
return RPKI_TR_ERROR;
}
}
return tr->open_fp(tr);
}
/**
* rpki_tr_close - close socket and prepare it for possible next open
* @tr: successfully opened transport socket
*
* Close socket and free resources.
*/
void
rpki_tr_close(struct rpki_tr_sock *tr)
{
if (tr->ident)
{
mb_free((char *) tr->ident);
tr->ident = NULL;
}
if (tr->sk)
{
rfree(tr->sk);
tr->sk = NULL;
}
}
/**
* rpki_tr_ident - Returns a string identifier for the rpki transport socket
* @tr: successfully opened transport socket
*
* Returns a \0 terminated string identifier for the socket endpoint, e.g. "<host>:<port>".
* Memory is allocated inside @tr structure.
*/
inline const char *
rpki_tr_ident(struct rpki_tr_sock *tr)
{
return tr->ident_fp(tr);
}
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