2 protocol_auth.c -- handle the meta-protocol, authentication
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2017 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"
48 #include "ed25519/sha512.h"
50 int invitation_lifetime;
51 ecdsa_t *invitation_key = NULL;
53 static bool send_proxyrequest(connection_t *c) {
59 sockaddr2str(&c->address, &host, &port);
60 send_request(c, "CONNECT %s:%s HTTP/1.1\r\n\r", host, port);
67 if(c->address.sa.sa_family != AF_INET) {
68 logger(DEBUG_ALWAYS, LOG_ERR, "Cannot connect to an IPv6 host through a SOCKS 4 proxy!");
72 char s4req[9 + (proxyuser ? strlen(proxyuser) : 0)];
75 memcpy(s4req + 2, &c->address.in.sin_port, 2);
76 memcpy(s4req + 4, &c->address.in.sin_addr, 4);
79 memcpy(s4req + 8, proxyuser, strlen(proxyuser));
82 s4req[sizeof(s4req) - 1] = 0;
84 return send_meta(c, s4req, sizeof(s4req));
88 int len = 3 + 6 + (c->address.sa.sa_family == AF_INET ? 4 : 16);
92 len += 3 + strlen(proxyuser) + strlen(proxypass);
103 s5req[i++] = strlen(proxyuser);
104 memcpy(s5req + i, proxyuser, strlen(proxyuser));
105 i += strlen(proxyuser);
106 s5req[i++] = strlen(proxypass);
107 memcpy(s5req + i, proxypass, strlen(proxypass));
108 i += strlen(proxypass);
118 if(c->address.sa.sa_family == AF_INET) {
120 memcpy(s5req + i, &c->address.in.sin_addr, 4);
122 memcpy(s5req + i, &c->address.in.sin_port, 2);
125 } else if(c->address.sa.sa_family == AF_INET6) {
127 memcpy(s5req + i, &c->address.in6.sin6_addr, 16);
129 memcpy(s5req + i, &c->address.in6.sin6_port, 2);
133 logger(DEBUG_ALWAYS, LOG_ERR, "Address family %x not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
141 return send_meta(c, s5req, sizeof(s5req));
145 logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type not implemented yet");
152 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type");
157 bool send_id(connection_t *c) {
158 gettimeofday(&c->start, NULL);
163 if(c->outgoing && !read_ecdsa_public_key(c)) {
166 minor = myself->connection->protocol_minor;
170 if(proxytype && c->outgoing)
171 if(!send_proxyrequest(c)) {
175 return send_request(c, "%d %s %d.%d", ID, myself->connection->name, myself->connection->protocol_major, minor);
178 static bool finalize_invitation(connection_t *c, const char *data, uint16_t len) {
181 if(strchr(data, '\n')) {
182 logger(DEBUG_ALWAYS, LOG_ERR, "Received invalid key from invited node %s (%s)!\n", c->name, c->hostname);
186 // Create a new host config file
187 char filename[PATH_MAX];
188 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
190 if(!access(filename, F_OK)) {
191 logger(DEBUG_ALWAYS, LOG_ERR, "Host config file for %s (%s) already exists!\n", c->name, c->hostname);
195 FILE *f = fopen(filename, "w");
198 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to create %s: %s\n", filename, strerror(errno));
202 fprintf(f, "Ed25519PublicKey = %s\n", data);
205 logger(DEBUG_CONNECTIONS, LOG_INFO, "Key successfully received from %s (%s)", c->name, c->hostname);
207 // Call invitation-accepted script
209 char *address, *port;
211 environment_init(&env);
212 environment_add(&env, "NODE=%s", c->name);
213 sockaddr2str(&c->address, &address, &port);
214 environment_add(&env, "REMOTEADDRESS=%s", address);
215 environment_add(&env, "NAME=%s", myself->name);
217 execute_script("invitation-accepted", &env);
219 environment_exit(&env);
221 sptps_send_record(&c->sptps, 2, data, 0);
225 static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
226 connection_t *c = handle;
232 if(type == 1 && c->status.invitation_used) {
233 return finalize_invitation(c, data, len);
236 if(type != 0 || len != 18 || c->status.invitation_used) {
240 // Recover the filename from the cookie and the key
241 char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
242 char hashbuf[18 + strlen(fingerprint)];
244 memcpy(hashbuf, data, 18);
245 memcpy(hashbuf + 18, fingerprint, sizeof(hashbuf) - 18);
246 sha512(hashbuf, sizeof(hashbuf), cookie);
247 b64encode_urlsafe(cookie, cookie, 18);
250 char filename[PATH_MAX], usedname[PATH_MAX];
251 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
252 snprintf(usedname, sizeof(usedname), "%s" SLASH "invitations" SLASH "%s.used", confbase, cookie);
254 // Atomically rename the invitation file
255 if(rename(filename, usedname)) {
256 if(errno == ENOENT) {
257 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
259 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to rename invitation %s\n", cookie);
265 // Check the timestamp of the invitation
268 if(stat(usedname, &st)) {
269 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat %s", usedname);
273 if(st.st_mtime + invitation_lifetime < now.tv_sec) {
274 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use expired invitation %s", c->hostname, cookie);
278 // Open the renamed file
279 FILE *f = fopen(usedname, "r");
282 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to open invitation %s\n", cookie);
286 // Read the new node's Name from the file
288 fgets(buf, sizeof(buf), f);
291 buf[strlen(buf) - 1] = 0;
294 len = strcspn(buf, " \t=");
295 char *name = buf + len;
296 name += strspn(name, " \t");
300 name += strspn(name, " \t");
305 if(!*buf || !*name || strcasecmp(buf, "Name") || !check_id(name) || !strcmp(name, myself->name)) {
306 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid invitation file %s\n", cookie);
312 c->name = xstrdup(name);
314 // Send the node the contents of the invitation file
318 while((result = fread(buf, 1, sizeof(buf), f))) {
319 sptps_send_record(&c->sptps, 0, buf, result);
322 sptps_send_record(&c->sptps, 1, buf, 0);
326 c->status.invitation_used = true;
328 logger(DEBUG_CONNECTIONS, LOG_INFO, "Invitation %s successfully sent to %s (%s)", cookie, c->name, c->hostname);
332 bool id_h(connection_t *c, const char *request) {
333 char name[MAX_STRING_SIZE];
335 if(sscanf(request, "%*d " MAX_STRING " %2d.%3d", name, &c->protocol_major, &c->protocol_minor) < 2) {
336 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
341 /* Check if this is a control connection */
343 if(name[0] == '^' && !strcmp(name + 1, controlcookie)) {
344 c->status.control = true;
345 c->allow_request = CONTROL;
346 c->last_ping_time = now.tv_sec + 3600;
349 c->name = xstrdup("<control>");
355 return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
359 if(!invitation_key) {
360 logger(DEBUG_ALWAYS, LOG_ERR, "Got invitation from %s but we don't have an invitation key", c->hostname);
364 c->ecdsa = ecdsa_set_base64_public_key(name + 1);
367 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad invitation from %s", c->hostname);
371 c->status.invitation = true;
372 char *mykey = ecdsa_get_base64_public_key(invitation_key);
382 if(!send_request(c, "%d %s", ACK, mykey)) {
388 c->protocol_minor = 2;
390 return sptps_start(&c->sptps, c, false, false, invitation_key, c->ecdsa, "tinc invitation", 15, send_meta_sptps, receive_invitation_sptps);
393 /* Check if identity is a valid name */
395 if(!check_id(name) || !strcmp(name, myself->name)) {
396 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
397 c->hostname, "invalid name");
401 /* If this is an outgoing connection, make sure we are connected to the right host */
404 if(strcmp(c->name, name)) {
405 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
411 c->name = xstrdup(name);
414 /* Check if version matches */
416 if(c->protocol_major != myself->connection->protocol_major) {
417 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
418 c->name, c->hostname, c->protocol_major, c->protocol_minor);
422 if(bypass_security) {
423 if(!c->config_tree) {
424 init_configuration(&c->config_tree);
427 c->allow_request = ACK;
437 c->protocol_minor = 0;
440 if(!c->config_tree) {
441 init_configuration(&c->config_tree);
443 if(!read_host_config(c->config_tree, c->name, false)) {
444 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
449 read_ecdsa_public_key(c);
452 /* Ignore failures if no key known yet */
455 if(c->protocol_minor && !ecdsa_active(c->ecdsa)) {
456 c->protocol_minor = 1;
459 /* Forbid version rollback for nodes whose Ed25519 key we know */
461 if(ecdsa_active(c->ecdsa) && c->protocol_minor < 1) {
462 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
463 c->name, c->hostname, c->protocol_major, c->protocol_minor);
467 c->allow_request = METAKEY;
473 if(c->protocol_minor >= 2) {
474 c->allow_request = ACK;
475 char label[25 + strlen(myself->name) + strlen(c->name)];
478 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", myself->name, c->name);
480 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", c->name, myself->name);
483 return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, sizeof(label), send_meta_sptps, receive_meta_sptps);
485 return send_metakey(c);
489 #ifndef DISABLE_LEGACY
490 bool send_metakey(connection_t *c) {
491 if(!myself->connection->rsa) {
492 logger(DEBUG_CONNECTIONS, LOG_ERR, "Peer %s (%s) uses legacy protocol which we don't support", c->name, c->hostname);
496 if(!read_rsa_public_key(c)) {
500 /* We need to use a stream mode for the meta protocol. Use AES for this,
501 but try to match the key size with the one from the cipher selected
505 int keylen = cipher_keylength(myself->incipher);
508 c->outcipher = cipher_open_by_name("aes-128-cfb");
509 } else if(keylen <= 24) {
510 c->outcipher = cipher_open_by_name("aes-192-cfb");
512 c->outcipher = cipher_open_by_name("aes-256-cfb");
519 c->outbudget = cipher_budget(c->outcipher);
521 if(!(c->outdigest = digest_open_by_name("sha256", -1))) {
525 const size_t len = rsa_size(c->rsa);
528 char hexkey[2 * len + 1];
530 /* Create a random key */
534 /* The message we send must be smaller than the modulus of the RSA key.
535 By definition, for a key of k bits, the following formula holds:
537 2^(k-1) <= modulus < 2^(k)
539 Where ^ means "to the power of", not "xor".
540 This means that to be sure, we must choose our message < 2^(k-1).
541 This can be done by setting the most significant bit to zero.
546 if(!cipher_set_key_from_rsa(c->outcipher, key, len, true)) {
550 if(debug_level >= DEBUG_SCARY_THINGS) {
551 bin2hex(key, hexkey, len);
552 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
555 /* Encrypt the random data
557 We do not use one of the PKCS padding schemes here.
558 This is allowed, because we encrypt a totally random string
559 with a length equal to that of the modulus of the RSA key.
562 if(!rsa_public_encrypt(c->rsa, key, len, enckey)) {
563 logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
567 /* Convert the encrypted random data to a hexadecimal formatted string */
569 bin2hex(enckey, hexkey, len);
571 /* Send the meta key */
573 bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
574 cipher_get_nid(c->outcipher),
575 digest_get_nid(c->outdigest), c->outmaclength,
576 c->outcompression, hexkey);
578 c->status.encryptout = true;
582 bool metakey_h(connection_t *c, const char *request) {
583 if(!myself->connection->rsa) {
587 char hexkey[MAX_STRING_SIZE];
588 int cipher, digest, maclength, compression;
589 const size_t len = rsa_size(myself->connection->rsa);
593 if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
594 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
598 /* Convert the challenge from hexadecimal back to binary */
600 size_t inlen = hex2bin(hexkey, enckey, sizeof(enckey));
602 /* Check if the length of the meta key is all right */
605 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
609 /* Decrypt the meta key */
611 if(!rsa_private_decrypt(myself->connection->rsa, enckey, len, key)) {
612 logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
616 if(debug_level >= DEBUG_SCARY_THINGS) {
617 bin2hex(key, hexkey, len);
618 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
621 /* Check and lookup cipher and digest algorithms */
624 if(!(c->incipher = cipher_open_by_nid(cipher)) || !cipher_set_key_from_rsa(c->incipher, key, len, false)) {
625 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
629 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null cipher");
633 c->inbudget = cipher_budget(c->incipher);
636 if(!(c->indigest = digest_open_by_nid(digest, -1))) {
637 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
641 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null digest");
645 c->status.decryptin = true;
647 c->allow_request = CHALLENGE;
649 return send_challenge(c);
652 bool send_challenge(connection_t *c) {
653 const size_t len = rsa_size(c->rsa);
654 char buffer[len * 2 + 1];
656 c->hischallenge = xrealloc(c->hischallenge, len);
658 /* Copy random data to the buffer */
660 randomize(c->hischallenge, len);
664 bin2hex(c->hischallenge, buffer, len);
666 /* Send the challenge */
668 return send_request(c, "%d %s", CHALLENGE, buffer);
671 bool challenge_h(connection_t *c, const char *request) {
672 if(!myself->connection->rsa) {
676 char buffer[MAX_STRING_SIZE];
677 const size_t len = rsa_size(myself->connection->rsa);
679 if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
680 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
684 /* Check if the length of the challenge is all right */
686 if(strlen(buffer) != (size_t)len * 2) {
687 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
691 c->mychallenge = xrealloc(c->mychallenge, len);
693 /* Convert the challenge from hexadecimal back to binary */
695 hex2bin(buffer, c->mychallenge, len);
697 /* The rest is done by send_chal_reply() */
699 c->allow_request = CHAL_REPLY;
702 return send_chal_reply(c);
708 bool send_chal_reply(connection_t *c) {
709 const size_t len = rsa_size(myself->connection->rsa);
710 size_t digestlen = digest_length(c->indigest);
711 char digest[digestlen * 2 + 1];
713 /* Calculate the hash from the challenge we received */
715 if(!digest_create(c->indigest, c->mychallenge, len, digest)) {
719 free(c->mychallenge);
720 c->mychallenge = NULL;
722 /* Convert the hash to a hexadecimal formatted string */
724 bin2hex(digest, digest, digestlen);
728 return send_request(c, "%d %s", CHAL_REPLY, digest);
731 bool chal_reply_h(connection_t *c, const char *request) {
732 char hishash[MAX_STRING_SIZE];
734 if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
735 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
740 /* Convert the hash to binary format */
742 size_t inlen = hex2bin(hishash, hishash, sizeof(hishash));
744 /* Check if the length of the hash is all right */
746 if(inlen != digest_length(c->outdigest)) {
747 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
752 /* Verify the hash */
754 if(!digest_verify(c->outdigest, c->hischallenge, rsa_size(c->rsa), hishash)) {
755 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
759 /* Identity has now been positively verified.
760 Send an acknowledgement with the rest of the information needed.
763 free(c->hischallenge);
764 c->hischallenge = NULL;
765 c->allow_request = ACK;
774 static bool send_upgrade(connection_t *c) {
775 /* Special case when protocol_minor is 1: the other end is Ed25519 capable,
776 * but doesn't know our key yet. So send it now. */
778 char *pubkey = ecdsa_get_base64_public_key(myself->connection->ecdsa);
784 bool result = send_request(c, "%d %s", ACK, pubkey);
789 bool send_metakey(connection_t *c) {
794 bool metakey_h(connection_t *c, const char *request) {
800 bool send_challenge(connection_t *c) {
805 bool challenge_h(connection_t *c, const char *request) {
811 bool send_chal_reply(connection_t *c) {
816 bool chal_reply_h(connection_t *c, const char *request) {
822 static bool send_upgrade(connection_t *c) {
828 bool send_ack(connection_t *c) {
829 if(c->protocol_minor == 1) {
830 return send_upgrade(c);
833 /* ACK message contains rest of the information the other end needs
834 to create node_t and edge_t structures. */
839 /* Estimate weight */
841 gettimeofday(&now, NULL);
842 c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
844 /* Check some options */
846 if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &choice) && choice) || myself->options & OPTION_INDIRECT) {
847 c->options |= OPTION_INDIRECT;
850 if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY) {
851 c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
854 if(myself->options & OPTION_PMTU_DISCOVERY && !(c->options & OPTION_TCPONLY)) {
855 c->options |= OPTION_PMTU_DISCOVERY;
858 choice = myself->options & OPTION_CLAMP_MSS;
859 get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice);
862 c->options |= OPTION_CLAMP_MSS;
865 if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight)) {
866 get_config_int(lookup_config(config_tree, "Weight"), &c->estimated_weight);
869 return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
872 static void send_everything(connection_t *c) {
873 /* Send all known subnets and edges */
875 if(disablebuggypeers) {
878 char pad[MAXBUFSIZE - MAXSIZE];
881 memset(&zeropkt, 0, sizeof(zeropkt));
882 zeropkt.pkt.len = MAXBUFSIZE;
883 send_tcppacket(c, &zeropkt.pkt);
887 for splay_each(subnet_t, s, myself->subnet_tree) {
888 send_add_subnet(c, s);
894 for splay_each(node_t, n, node_tree) {
895 for splay_each(subnet_t, s, n->subnet_tree) {
896 send_add_subnet(c, s);
899 for splay_each(edge_t, e, n->edge_tree) {
905 static bool upgrade_h(connection_t *c, const char *request) {
906 char pubkey[MAX_STRING_SIZE];
908 if(sscanf(request, "%*d " MAX_STRING, pubkey) != 1) {
909 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name, c->hostname);
913 if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(c)) {
914 char *knownkey = ecdsa_get_base64_public_key(c->ecdsa);
915 bool different = strcmp(knownkey, pubkey);
919 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);
923 logger(DEBUG_ALWAYS, LOG_INFO, "Already have Ed25519 public key from %s (%s), ignoring.", c->name, c->hostname);
924 c->allow_request = TERMREQ;
925 return send_termreq(c);
928 c->ecdsa = ecdsa_set_base64_public_key(pubkey);
931 logger(DEBUG_ALWAYS, LOG_INFO, "Got bad Ed25519 public key from %s (%s), not upgrading.", c->name, c->hostname);
935 logger(DEBUG_ALWAYS, LOG_INFO, "Got Ed25519 public key from %s (%s), upgrading!", c->name, c->hostname);
936 append_config_file(c->name, "Ed25519PublicKey", pubkey);
937 c->allow_request = TERMREQ;
940 c->outgoing->timeout = 0;
943 return send_termreq(c);
946 bool ack_h(connection_t *c, const char *request) {
947 if(c->protocol_minor == 1) {
948 return upgrade_h(c, request);
951 char hisport[MAX_STRING_SIZE];
957 if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
958 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
963 /* Check if we already have a node_t for him */
965 n = lookup_node(c->name);
969 n->name = xstrdup(c->name);
973 /* Oh dear, we already have a connection to this node. */
974 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
976 if(n->connection->outgoing) {
978 logger(DEBUG_ALWAYS, LOG_WARNING, "Two outgoing connections to the same node!");
980 c->outgoing = n->connection->outgoing;
983 n->connection->outgoing = NULL;
986 terminate_connection(n->connection, false);
987 /* Run graph algorithm to purge key and make sure up/down scripts are rerun with new IP addresses and stuff */
995 if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
996 c->options &= ~OPTION_PMTU_DISCOVERY;
997 options &= ~OPTION_PMTU_DISCOVERY;
1000 c->options |= options;
1002 if(get_config_int(lookup_config(c->config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
1006 if(get_config_int(lookup_config(config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
1010 if(get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice)) {
1012 c->options |= OPTION_CLAMP_MSS;
1014 c->options &= ~OPTION_CLAMP_MSS;
1018 /* Activate this connection */
1020 c->allow_request = ALL;
1022 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
1025 /* Send him everything we know */
1029 /* Create an edge_t for this connection */
1031 c->edge = new_edge();
1032 c->edge->from = myself;
1034 sockaddrcpy(&c->edge->address, &c->address);
1035 sockaddr_setport(&c->edge->address, hisport);
1036 sockaddr_t local_sa;
1037 socklen_t local_salen = sizeof(local_sa);
1039 if(getsockname(c->socket, &local_sa.sa, &local_salen) < 0) {
1040 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get local socket address for connection with %s", c->name);
1042 sockaddr_setport(&local_sa, myport);
1043 c->edge->local_address = local_sa;
1046 c->edge->weight = (weight + c->estimated_weight) / 2;
1047 c->edge->connection = c;
1048 c->edge->options = c->options;
1052 /* Notify everyone of the new edge */
1055 send_add_edge(c, c->edge);
1057 send_add_edge(everyone, c->edge);
1060 /* Run MST and SSSP algorithms */