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Annotation of embedaddon/bird2/proto/rpki/transport.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  *     BIRD -- The Resource Public Key Infrastructure (RPKI) to Router Protocol
        !             3:  *
        !             4:  *     (c) 2015 CZ.NIC
        !             5:  *     (c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
        !             6:  *
        !             7:  *     This file was a part of RTRlib: http://rpki.realmv6.org/
        !             8:  *
        !             9:  *     Can be freely distributed and used under the terms of the GNU GPL.
        !            10:  */
        !            11: 
        !            12: #include <sys/socket.h>
        !            13: #include <netdb.h>
        !            14: 
        !            15: #include "rpki.h"
        !            16: #include "transport.h"
        !            17: #include "sysdep/unix/unix.h"
        !            18: 
        !            19: /**
        !            20:  * rpki_hostname_autoresolv - auto-resolve an IP address from a hostname
        !            21:  * @host: domain name of host, e.g. "rpki-validator.realmv6.org"
        !            22:  *
        !            23:  * This function resolves an IP address from a hostname.
        !            24:  * Returns &ip_addr structure with IP address or |IPA_NONE|.
        !            25:  */
        !            26: static ip_addr
        !            27: rpki_hostname_autoresolv(const char *host)
        !            28: {
        !            29:   ip_addr addr = {};
        !            30:   struct addrinfo *res;
        !            31:   struct addrinfo hints = {
        !            32:       .ai_family = AF_UNSPEC,
        !            33:       .ai_socktype = SOCK_STREAM,
        !            34:       .ai_flags = AI_ADDRCONFIG,
        !            35:   };
        !            36: 
        !            37:   if (!host)
        !            38:     return IPA_NONE;
        !            39: 
        !            40:   int err_code = getaddrinfo(host, NULL, &hints, &res);
        !            41:   if (err_code != 0)
        !            42:   {
        !            43:     log(L_DEBUG "getaddrinfo failed: %s", gai_strerror(err_code));
        !            44:     return IPA_NONE;
        !            45:   }
        !            46: 
        !            47:   sockaddr sa = {
        !            48:       .sa = *res->ai_addr,
        !            49:   };
        !            50: 
        !            51:   uint unused;
        !            52:   sockaddr_read(&sa, res->ai_family, &addr, NULL, &unused);
        !            53: 
        !            54:   freeaddrinfo(res);
        !            55:   return addr;
        !            56: }
        !            57: 
        !            58: /**
        !            59:  * rpki_tr_open - prepare and open a socket connection
        !            60:  * @tr: initialized transport socket
        !            61:  *
        !            62:  * Prepare and open a socket connection specified by @tr that must be initialized before.
        !            63:  * This function ends with a calling the sk_open() function.
        !            64:  * Returns RPKI_TR_SUCCESS or RPKI_TR_ERROR.
        !            65:  */
        !            66: int
        !            67: rpki_tr_open(struct rpki_tr_sock *tr)
        !            68: {
        !            69:   struct rpki_cache *cache = tr->cache;
        !            70:   struct rpki_config *cf = (void *) cache->p->p.cf;
        !            71: 
        !            72:   ASSERT(tr->sk == NULL);
        !            73:   tr->sk = sk_new(cache->pool);
        !            74:   sock *sk = tr->sk;
        !            75: 
        !            76:   /* sk->type -1 is invalid value, a correct value MUST be set in the specific transport layer in open_fp() hook */
        !            77:   sk->type = -1;
        !            78: 
        !            79:   sk->tx_hook = rpki_connected_hook;
        !            80:   sk->err_hook = rpki_err_hook;
        !            81:   sk->data = cache;
        !            82:   sk->daddr = cf->ip;
        !            83:   sk->dport = cf->port;
        !            84:   sk->host = cf->hostname;
        !            85:   sk->rbsize = RPKI_RX_BUFFER_SIZE;
        !            86:   sk->tbsize = RPKI_TX_BUFFER_SIZE;
        !            87:   sk->tos = IP_PREC_INTERNET_CONTROL;
        !            88: 
        !            89:   if (ipa_zero2(sk->daddr) && sk->host)
        !            90:   {
        !            91:     sk->daddr = rpki_hostname_autoresolv(sk->host);
        !            92:     if (ipa_zero(sk->daddr))
        !            93:     {
        !            94:       CACHE_TRACE(D_EVENTS, cache, "Cannot resolve the hostname '%s'", sk->host);
        !            95:       return RPKI_TR_ERROR;
        !            96:     }
        !            97:   }
        !            98: 
        !            99:   return tr->open_fp(tr);
        !           100: }
        !           101: 
        !           102: /**
        !           103:  * rpki_tr_close - close socket and prepare it for possible next open
        !           104:  * @tr: successfully opened transport socket
        !           105:  *
        !           106:  * Close socket and free resources.
        !           107:  */
        !           108: void
        !           109: rpki_tr_close(struct rpki_tr_sock *tr)
        !           110: {
        !           111:   if (tr->ident)
        !           112:   {
        !           113:     mb_free((char *) tr->ident);
        !           114:     tr->ident = NULL;
        !           115:   }
        !           116: 
        !           117:   if (tr->sk)
        !           118:   {
        !           119:     rfree(tr->sk);
        !           120:     tr->sk = NULL;
        !           121:   }
        !           122: }
        !           123: 
        !           124: /**
        !           125:  * rpki_tr_ident - Returns a string identifier for the rpki transport socket
        !           126:  * @tr: successfully opened transport socket
        !           127:  *
        !           128:  * Returns a \0 terminated string identifier for the socket endpoint, e.g. "<host>:<port>".
        !           129:  * Memory is allocated inside @tr structure.
        !           130:  */
        !           131: inline const char *
        !           132: rpki_tr_ident(struct rpki_tr_sock *tr)
        !           133: {
        !           134:   return tr->ident_fp(tr);
        !           135: }