2 protocol_auth.c -- handle the meta-protocol, authentication
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2022 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include "connection.h"
26 #include "control_common.h"
45 #include "compression.h"
48 #include "ed25519/sha512.h"
51 /* If nonzero, use null ciphers and skip all key exchanges. */
52 bool bypass_security = false;
54 int invitation_lifetime;
55 ecdsa_t *invitation_key = NULL;
57 static bool send_proxyrequest(connection_t *c) {
63 sockaddr2str(&c->address, &host, &port);
64 send_request(c, "CONNECT %s:%s HTTP/1.1\r\n\r", host, port);
72 size_t reqlen = socks_req_len(proxytype, &c->address);
73 uint8_t *req = alloca(reqlen);
74 c->tcplen = create_socks_req(proxytype, req, &c->address);
75 return c->tcplen ? send_meta(c, req, reqlen) : false;
79 logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type not implemented yet");
86 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type");
91 bool send_id(connection_t *c) {
92 gettimeofday(&c->start, NULL);
97 if(c->outgoing && !read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name)) {
100 minor = myself->connection->protocol_minor;
104 if(proxytype && c->outgoing)
105 if(!send_proxyrequest(c)) {
109 return send_request(c, "%d %s %d.%d", ID, myself->connection->name, myself->connection->protocol_major, minor);
112 static bool finalize_invitation(connection_t *c, const char *data, uint16_t len) {
115 if(strchr(data, '\n')) {
116 logger(DEBUG_ALWAYS, LOG_ERR, "Received invalid key from invited node %s (%s)!\n", c->name, c->hostname);
120 // Create a new host config file
121 char filename[PATH_MAX];
122 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
124 if(!access(filename, F_OK)) {
125 logger(DEBUG_ALWAYS, LOG_ERR, "Host config file for %s (%s) already exists!\n", c->name, c->hostname);
129 FILE *f = fopen(filename, "w");
132 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to create %s: %s\n", filename, strerror(errno));
136 fprintf(f, "Ed25519PublicKey = %s\n", data);
139 logger(DEBUG_CONNECTIONS, LOG_INFO, "Key successfully received from %s (%s)", c->name, c->hostname);
141 // Call invitation-accepted script
143 char *address, *port;
145 environment_init(&env);
146 environment_add(&env, "NODE=%s", c->name);
147 sockaddr2str(&c->address, &address, &port);
148 environment_add(&env, "REMOTEADDRESS=%s", address);
149 environment_add(&env, "NAME=%s", myself->name);
154 execute_script("invitation-accepted", &env);
156 environment_exit(&env);
158 sptps_send_record(&c->sptps, 2, data, 0);
162 static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
163 connection_t *c = handle;
169 if(type == 1 && c->status.invitation_used) {
170 return finalize_invitation(c, data, len);
173 if(type != 0 || len != 18 || c->status.invitation_used) {
177 // Recover the filename from the cookie and the key
178 char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
179 const size_t hashbuflen = 18 + strlen(fingerprint);
180 char *hashbuf = alloca(hashbuflen);
182 memcpy(hashbuf, data, 18);
183 memcpy(hashbuf + 18, fingerprint, hashbuflen - 18);
184 sha512(hashbuf, hashbuflen, cookie);
185 b64encode_tinc_urlsafe(cookie, cookie, 18);
188 char filename[PATH_MAX], usedname[PATH_MAX];
189 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
190 snprintf(usedname, sizeof(usedname), "%s" SLASH "invitations" SLASH "%s.used", confbase, cookie);
192 // Atomically rename the invitation file
193 if(rename(filename, usedname)) {
194 if(errno == ENOENT) {
195 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
197 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to rename invitation %s\n", cookie);
203 // Check the timestamp of the invitation
206 if(stat(usedname, &st)) {
207 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat %s", usedname);
211 if(st.st_mtime + invitation_lifetime < now.tv_sec) {
212 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use expired invitation %s", c->hostname, cookie);
216 // Open the renamed file
217 FILE *f = fopen(usedname, "r");
220 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to open invitation %s\n", cookie);
224 // Read the new node's Name from the file
227 if(!fgets(buf, sizeof(buf), f)) {
228 logger(DEBUG_ALWAYS, LOG_ERR, "Could not read invitation file %s\n", cookie);
233 size_t buflen = strlen(buf);
235 // Strip whitespace at the end
236 while(buflen && strchr(" \t\r\n", buf[buflen - 1])) {
240 // Split the first line into variable and value
241 len = strcspn(buf, " \t=");
242 char *name = buf + len;
243 name += strspn(name, " \t");
247 name += strspn(name, " \t");
252 // Check that it is a valid Name
253 if(!*buf || !*name || strcasecmp(buf, "Name") || !check_id(name) || !strcmp(name, myself->name)) {
254 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid invitation file %s\n", cookie);
260 c->name = xstrdup(name);
262 // Send the node the contents of the invitation file
266 while((result = fread(buf, 1, sizeof(buf), f))) {
267 sptps_send_record(&c->sptps, 0, buf, result);
271 logger(DEBUG_ALWAYS, LOG_ERR, "Could not read invitation file %s\n", cookie);
276 sptps_send_record(&c->sptps, 1, buf, 0);
280 c->status.invitation_used = true;
282 logger(DEBUG_CONNECTIONS, LOG_INFO, "Invitation %s successfully sent to %s (%s)", cookie, c->name, c->hostname);
286 bool id_h(connection_t *c, const char *request) {
287 char name[MAX_STRING_SIZE];
289 if(sscanf(request, "%*d " MAX_STRING " %2d.%3d", name, &c->protocol_major, &c->protocol_minor) < 2) {
290 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
295 /* Check if this is a control connection */
297 if(name[0] == '^' && !strcmp(name + 1, controlcookie)) {
298 c->status.control = true;
299 c->allow_request = CONTROL;
300 c->last_ping_time = now.tv_sec + 3600;
303 c->name = xstrdup("<control>");
309 return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
313 if(!invitation_key) {
314 logger(DEBUG_ALWAYS, LOG_ERR, "Got invitation from %s but we don't have an invitation key", c->hostname);
318 c->ecdsa = ecdsa_set_base64_public_key(name + 1);
321 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad invitation from %s", c->hostname);
325 c->status.invitation = true;
326 char *mykey = ecdsa_get_base64_public_key(invitation_key);
336 if(!send_request(c, "%d %s", ACK, mykey)) {
342 c->protocol_minor = 2;
344 return sptps_start(&c->sptps, c, false, false, invitation_key, c->ecdsa, "tinc invitation", 15, send_meta_sptps, receive_invitation_sptps);
347 /* Check if identity is a valid name */
349 if(!check_id(name) || !strcmp(name, myself->name)) {
350 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
351 c->hostname, "invalid name");
355 /* If this is an outgoing connection, make sure we are connected to the right host */
358 if(strcmp(c->name, name)) {
359 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
365 c->name = xstrdup(name);
368 /* Check if version matches */
370 if(c->protocol_major != myself->connection->protocol_major) {
371 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
372 c->name, c->hostname, c->protocol_major, c->protocol_minor);
376 if(bypass_security) {
377 if(!c->config_tree) {
378 c->config_tree = create_configuration();
381 c->allow_request = ACK;
391 c->protocol_minor = 0;
394 if(!c->config_tree) {
395 c->config_tree = create_configuration();
397 if(!read_host_config(c->config_tree, c->name, false)) {
398 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
403 read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name);
406 /* Ignore failures if no key known yet */
409 if(c->protocol_minor && !ecdsa_active(c->ecdsa)) {
410 c->protocol_minor = 1;
413 /* Forbid version rollback for nodes whose Ed25519 key we know */
415 if(ecdsa_active(c->ecdsa) && c->protocol_minor < 1) {
416 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
417 c->name, c->hostname, c->protocol_major, c->protocol_minor);
421 c->allow_request = METAKEY;
427 if(c->protocol_minor >= 2) {
428 c->allow_request = ACK;
430 const size_t labellen = 25 + strlen(myself->name) + strlen(c->name);
431 char *label = alloca(labellen);
434 snprintf(label, labellen, "tinc TCP key expansion %s %s", myself->name, c->name);
436 snprintf(label, labellen, "tinc TCP key expansion %s %s", c->name, myself->name);
439 return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, labellen, send_meta_sptps, receive_meta_sptps);
441 return send_metakey(c);
445 #ifndef DISABLE_LEGACY
446 static const char *get_cipher_name(cipher_t *cipher) {
447 size_t keylen = cipher_keylength(cipher);
450 return "aes-128-cfb";
451 } else if(keylen <= 24) {
452 return "aes-192-cfb";
454 return "aes-256-cfb";
458 bool send_metakey(connection_t *c) {
459 if(!myself->connection->legacy) {
460 logger(DEBUG_CONNECTIONS, LOG_ERR, "Peer %s (%s) uses legacy protocol which we don't support", c->name, c->hostname);
464 rsa_t *rsa = read_rsa_public_key(c->config_tree, c->name);
470 legacy_ctx_t *ctx = new_legacy_ctx(rsa);
472 /* We need to use a stream mode for the meta protocol. Use AES for this,
473 but try to match the key size with the one from the cipher selected
477 const char *cipher_name = get_cipher_name(myself->incipher);
479 if(!init_crypto_by_name(&ctx->out, cipher_name, "sha256")) {
480 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher or digest to %s (%s)", c->name, c->hostname);
481 free_legacy_ctx(ctx);
485 const size_t len = rsa_size(ctx->rsa);
486 const size_t hexkeylen = HEX_SIZE(len);
487 char *key = alloca(len);
488 char *enckey = alloca(len);
489 char *hexkey = alloca(hexkeylen);
491 /* Create a random key */
495 /* The message we send must be smaller than the modulus of the RSA key.
496 By definition, for a key of k bits, the following formula holds:
498 2^(k-1) <= modulus < 2^(k)
500 Where ^ means "to the power of", not "xor".
501 This means that to be sure, we must choose our message < 2^(k-1).
502 This can be done by setting the most significant bit to zero.
507 if(!cipher_set_key_from_rsa(&ctx->out.cipher, key, len, true)) {
508 free_legacy_ctx(ctx);
513 if(debug_level >= DEBUG_SCARY_THINGS) {
514 bin2hex(key, hexkey, len);
515 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
516 memzero(hexkey, hexkeylen);
519 /* Encrypt the random data
521 We do not use one of the PKCS padding schemes here.
522 This is allowed, because we encrypt a totally random string
523 with a length equal to that of the modulus of the RSA key.
526 bool encrypted = rsa_public_encrypt(ctx->rsa, key, len, enckey);
530 free_legacy_ctx(ctx);
531 logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
535 free_legacy_ctx(c->legacy);
538 /* Convert the encrypted random data to a hexadecimal formatted string */
540 bin2hex(enckey, hexkey, len);
542 /* Send the meta key */
544 bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
545 cipher_get_nid(&c->legacy->out.cipher),
546 digest_get_nid(&c->legacy->out.digest), c->outmaclength,
547 COMPRESS_NONE, hexkey);
549 c->status.encryptout = true;
553 bool metakey_h(connection_t *c, const char *request) {
554 if(!myself->connection->legacy || !c->legacy) {
558 char hexkey[MAX_STRING_SIZE];
560 const size_t len = rsa_size(myself->connection->legacy->rsa);
561 char *enckey = alloca(len);
562 char *key = alloca(len);
564 if(sscanf(request, "%*d %d %d %*d %*d " MAX_STRING, &cipher, &digest, hexkey) != 3) {
565 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
569 if(!cipher || !digest) {
570 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): cipher %d, digest %d", c->name, c->hostname, cipher, digest);
574 /* Convert the challenge from hexadecimal back to binary */
576 size_t inlen = hex2bin(hexkey, enckey, len);
578 /* Check if the length of the meta key is all right */
581 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
585 /* Decrypt the meta key */
587 if(!rsa_private_decrypt(myself->connection->legacy->rsa, enckey, len, key)) {
588 logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
592 if(debug_level >= DEBUG_SCARY_THINGS) {
593 bin2hex(key, hexkey, len);
594 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
595 // Hopefully the user knew what he was doing leaking session keys into logs. We'll do the right thing here anyway.
596 memzero(hexkey, HEX_SIZE(len));
599 /* Check and lookup cipher and digest algorithms */
601 if(!init_crypto_by_nid(&c->legacy->in, cipher, digest)) {
603 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher or digest from %s (%s)", c->name, c->hostname);
607 bool key_set = cipher_set_key_from_rsa(&c->legacy->in.cipher, key, len, false);
611 logger(DEBUG_ALWAYS, LOG_ERR, "Error setting RSA key for %s (%s)", c->name, c->hostname);
615 c->status.decryptin = true;
617 c->allow_request = CHALLENGE;
619 return send_challenge(c);
622 bool send_challenge(connection_t *c) {
623 const size_t len = rsa_size(c->legacy->rsa);
624 char *buffer = alloca(len * 2 + 1);
626 c->hischallenge = xrealloc(c->hischallenge, len);
628 /* Copy random data to the buffer */
630 randomize(c->hischallenge, len);
634 bin2hex(c->hischallenge, buffer, len);
636 /* Send the challenge */
638 return send_request(c, "%d %s", CHALLENGE, buffer);
641 bool challenge_h(connection_t *c, const char *request) {
642 if(!myself->connection->legacy) {
646 char buffer[MAX_STRING_SIZE];
647 const size_t len = rsa_size(myself->connection->legacy->rsa);
649 if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
650 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
654 /* Check if the length of the challenge is all right */
656 if(strlen(buffer) != (size_t)len * 2) {
657 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
661 c->mychallenge = xrealloc(c->mychallenge, len);
663 /* Convert the challenge from hexadecimal back to binary */
665 hex2bin(buffer, c->mychallenge, len);
667 /* The rest is done by send_chal_reply() */
669 c->allow_request = CHAL_REPLY;
672 return send_chal_reply(c);
678 bool send_chal_reply(connection_t *c) {
679 const size_t len = rsa_size(myself->connection->legacy->rsa);
680 size_t digestlen = digest_length(&c->legacy->in.digest);
681 char *digest = alloca(digestlen * 2 + 1);
683 /* Calculate the hash from the challenge we received */
685 if(!digest_create(&c->legacy->in.digest, c->mychallenge, len, digest)) {
689 free(c->mychallenge);
690 c->mychallenge = NULL;
692 /* Convert the hash to a hexadecimal formatted string */
694 bin2hex(digest, digest, digestlen);
698 return send_request(c, "%d %s", CHAL_REPLY, digest);
701 bool chal_reply_h(connection_t *c, const char *request) {
702 char hishash[MAX_STRING_SIZE];
704 if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
705 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
710 /* Convert the hash to binary format */
712 size_t inlen = hex2bin(hishash, hishash, sizeof(hishash));
714 /* Check if the length of the hash is all right */
716 if(inlen != digest_length(&c->legacy->out.digest)) {
717 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
722 /* Verify the hash */
724 if(!digest_verify(&c->legacy->out.digest, c->hischallenge, rsa_size(c->legacy->rsa), hishash)) {
725 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
729 /* Identity has now been positively verified.
730 Send an acknowledgement with the rest of the information needed.
733 free(c->hischallenge);
734 c->hischallenge = NULL;
735 c->allow_request = ACK;
744 static bool send_upgrade(connection_t *c) {
745 /* Special case when protocol_minor is 1: the other end is Ed25519 capable,
746 * but doesn't know our key yet. So send it now. */
748 char *pubkey = ecdsa_get_base64_public_key(myself->connection->ecdsa);
754 bool result = send_request(c, "%d %s", ACK, pubkey);
759 bool send_metakey(connection_t *c) {
764 bool metakey_h(connection_t *c, const char *request) {
770 bool send_challenge(connection_t *c) {
775 bool challenge_h(connection_t *c, const char *request) {
781 bool send_chal_reply(connection_t *c) {
786 bool chal_reply_h(connection_t *c, const char *request) {
792 static bool send_upgrade(connection_t *c) {
798 bool send_ack(connection_t *c) {
799 if(c->protocol_minor == 1) {
800 return send_upgrade(c);
803 /* ACK message contains rest of the information the other end needs
804 to create node_t and edge_t structures. */
809 /* Estimate weight */
811 gettimeofday(&now, NULL);
812 c->estimated_weight = (int)((now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000);
814 /* Check some options */
816 if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &choice) && choice) || myself->options & OPTION_INDIRECT) {
817 c->options |= OPTION_INDIRECT;
820 if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY) {
821 c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
824 if(myself->options & OPTION_PMTU_DISCOVERY && !(c->options & OPTION_TCPONLY)) {
825 c->options |= OPTION_PMTU_DISCOVERY;
828 choice = myself->options & OPTION_CLAMP_MSS;
829 get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice);
832 c->options |= OPTION_CLAMP_MSS;
835 if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight)) {
836 get_config_int(lookup_config(&config_tree, "Weight"), &c->estimated_weight);
839 return send_request(c, "%d %s %d %x", ACK, myport.udp, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
842 static void send_everything(connection_t *c) {
843 /* Send all known subnets and edges */
845 if(disablebuggypeers) {
848 char pad[MAXBUFSIZE - MAXSIZE];
851 memset(&zeropkt, 0, sizeof(zeropkt));
852 zeropkt.pkt.len = MAXBUFSIZE;
853 send_tcppacket(c, &zeropkt.pkt);
857 for splay_each(subnet_t, s, &myself->subnet_tree) {
858 send_add_subnet(c, s);
864 for splay_each(node_t, n, &node_tree) {
865 for splay_each(subnet_t, s, &n->subnet_tree) {
866 send_add_subnet(c, s);
869 for splay_each(edge_t, e, &n->edge_tree) {
875 static bool upgrade_h(connection_t *c, const char *request) {
876 char pubkey[MAX_STRING_SIZE];
878 if(sscanf(request, "%*d " MAX_STRING, pubkey) != 1) {
879 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name, c->hostname);
883 if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name)) {
884 char *knownkey = ecdsa_get_base64_public_key(c->ecdsa);
885 bool different = strcmp(knownkey, pubkey);
889 logger(DEBUG_ALWAYS, LOG_ERR, "Already have an Ed25519 public key from %s (%s) which is different from the one presented now!", c->name, c->hostname);
893 logger(DEBUG_ALWAYS, LOG_INFO, "Already have Ed25519 public key from %s (%s), ignoring.", c->name, c->hostname);
894 c->allow_request = TERMREQ;
895 return send_termreq(c);
898 c->ecdsa = ecdsa_set_base64_public_key(pubkey);
901 logger(DEBUG_ALWAYS, LOG_INFO, "Got bad Ed25519 public key from %s (%s), not upgrading.", c->name, c->hostname);
905 logger(DEBUG_ALWAYS, LOG_INFO, "Got Ed25519 public key from %s (%s), upgrading!", c->name, c->hostname);
906 append_config_file(c->name, "Ed25519PublicKey", pubkey);
907 c->allow_request = TERMREQ;
910 c->outgoing->timeout = 0;
913 return send_termreq(c);
916 bool ack_h(connection_t *c, const char *request) {
917 if(c->protocol_minor == 1) {
918 return upgrade_h(c, request);
921 char hisport[MAX_STRING_SIZE];
927 if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
928 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
933 /* Check if we already have a node_t for him */
935 n = lookup_node(c->name);
939 n->name = xstrdup(c->name);
943 /* Oh dear, we already have a connection to this node. */
944 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
946 if(n->connection->outgoing) {
948 logger(DEBUG_ALWAYS, LOG_WARNING, "Two outgoing connections to the same node!");
950 c->outgoing = n->connection->outgoing;
953 n->connection->outgoing = NULL;
956 terminate_connection(n->connection, false);
957 /* Run graph algorithm to purge key and make sure up/down scripts are rerun with new IP addresses and stuff */
965 if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
966 c->options &= ~OPTION_PMTU_DISCOVERY;
967 options &= ~OPTION_PMTU_DISCOVERY;
970 c->options |= options;
972 if(get_config_int(lookup_config(c->config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
976 if(get_config_int(lookup_config(&config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
980 if(get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice)) {
982 c->options |= OPTION_CLAMP_MSS;
984 c->options &= ~OPTION_CLAMP_MSS;
988 /* Activate this connection */
990 c->allow_request = ALL;
992 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
995 /* Send him everything we know */
999 /* Create an edge_t for this connection */
1001 c->edge = new_edge();
1002 c->edge->from = myself;
1004 sockaddrcpy(&c->edge->address, &c->address);
1005 sockaddr_setport(&c->edge->address, hisport);
1006 sockaddr_t local_sa;
1007 socklen_t local_salen = sizeof(local_sa);
1009 if(getsockname(c->socket, &local_sa.sa, &local_salen) < 0) {
1010 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get local socket address for connection with %s", c->name);
1012 sockaddr_setport(&local_sa, myport.udp);
1013 c->edge->local_address = local_sa;
1016 c->edge->weight = (weight + c->estimated_weight) / 2;
1017 c->edge->connection = c;
1018 c->edge->options = c->options;
1022 /* Notify everyone of the new edge */
1025 send_add_edge(c, c->edge);
1027 send_add_edge(everyone, c->edge);
1030 /* Run MST and SSSP algorithms */