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);
66 if(c->address.sa.sa_family != AF_INET) {
67 logger(DEBUG_ALWAYS, LOG_ERR, "Cannot connect to an IPv6 host through a SOCKS 4 proxy!");
70 char s4req[9 + (proxyuser ? strlen(proxyuser) : 0)];
73 memcpy(s4req + 2, &c->address.in.sin_port, 2);
74 memcpy(s4req + 4, &c->address.in.sin_addr, 4);
76 memcpy(s4req + 8, proxyuser, strlen(proxyuser));
77 s4req[sizeof(s4req) - 1] = 0;
79 return send_meta(c, s4req, sizeof(s4req));
82 int len = 3 + 6 + (c->address.sa.sa_family == AF_INET ? 4 : 16);
85 len += 3 + strlen(proxyuser) + strlen(proxypass);
93 s5req[i++] = strlen(proxyuser);
94 memcpy(s5req + i, proxyuser, strlen(proxyuser));
95 i += strlen(proxyuser);
96 s5req[i++] = strlen(proxypass);
97 memcpy(s5req + i, proxypass, strlen(proxypass));
98 i += strlen(proxypass);
106 if(c->address.sa.sa_family == AF_INET) {
108 memcpy(s5req + i, &c->address.in.sin_addr, 4);
110 memcpy(s5req + i, &c->address.in.sin_port, 2);
113 } else if(c->address.sa.sa_family == AF_INET6) {
115 memcpy(s5req + i, &c->address.in6.sin6_addr, 16);
117 memcpy(s5req + i, &c->address.in6.sin6_port, 2);
121 logger(DEBUG_ALWAYS, LOG_ERR, "Address family %x not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
126 return send_meta(c, s5req, sizeof(s5req));
129 logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type not implemented yet");
134 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type");
139 bool send_id(connection_t *c) {
140 gettimeofday(&c->start, NULL);
145 if(c->outgoing && !read_ecdsa_public_key(c))
148 minor = myself->connection->protocol_minor;
151 if(proxytype && c->outgoing)
152 if(!send_proxyrequest(c))
155 return send_request(c, "%d %s %d.%d", ID, myself->connection->name, myself->connection->protocol_major, minor);
158 static bool finalize_invitation(connection_t *c, const char *data, uint16_t len) {
159 if(strchr(data, '\n')) {
160 logger(DEBUG_ALWAYS, LOG_ERR, "Received invalid key from invited node %s (%s)!\n", c->name, c->hostname);
164 // Create a new host config file
165 char filename[PATH_MAX];
166 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
167 if(!access(filename, F_OK)) {
168 logger(DEBUG_ALWAYS, LOG_ERR, "Host config file for %s (%s) already exists!\n", c->name, c->hostname);
172 FILE *f = fopen(filename, "w");
174 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to create %s: %s\n", filename, strerror(errno));
178 fprintf(f, "Ed25519PublicKey = %s\n", data);
181 logger(DEBUG_CONNECTIONS, LOG_INFO, "Key succesfully received from %s (%s)", c->name, c->hostname);
183 // Call invitation-accepted script
185 char *address, *port;
187 environment_init(&env);
188 environment_add(&env, "NODE=%s", c->name);
189 sockaddr2str(&c->address, &address, &port);
190 environment_add(&env, "REMOTEADDRESS=%s", address);
191 environment_add(&env, "NAME=%s", myself->name);
193 execute_script("invitation-accepted", &env);
195 environment_exit(&env);
197 sptps_send_record(&c->sptps, 2, data, 0);
201 static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
202 connection_t *c = handle;
207 if(type == 1 && c->status.invitation_used)
208 return finalize_invitation(c, data, len);
210 if(type != 0 || len != 18 || c->status.invitation_used)
213 // Recover the filename from the cookie and the key
214 char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
215 char hashbuf[18 + strlen(fingerprint)];
217 memcpy(hashbuf, data, 18);
218 memcpy(hashbuf + 18, fingerprint, sizeof(hashbuf) - 18);
219 sha512(hashbuf, sizeof(hashbuf), cookie);
220 b64encode_urlsafe(cookie, cookie, 18);
223 char filename[PATH_MAX], usedname[PATH_MAX];
224 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
225 snprintf(usedname, sizeof(usedname), "%s" SLASH "invitations" SLASH "%s.used", confbase, cookie);
227 // Atomically rename the invitation file
228 if(rename(filename, usedname)) {
230 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
232 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to rename invitation %s\n", cookie);
236 // Check the timestamp of the invitation
238 if(stat(usedname, &st)) {
239 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat %s", usedname);
243 if(st.st_mtime + invitation_lifetime < now.tv_sec) {
244 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use expired invitation %s", c->hostname, cookie);
248 // Open the renamed file
249 FILE *f = fopen(usedname, "r");
251 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to open invitation %s\n", cookie);
255 // Read the new node's Name from the file
257 fgets(buf, sizeof(buf), f);
259 buf[strlen(buf) - 1] = 0;
261 len = strcspn(buf, " \t=");
262 char *name = buf + len;
263 name += strspn(name, " \t");
266 name += strspn(name, " \t");
270 if(!*buf || !*name || strcasecmp(buf, "Name") || !check_id(name)) {
271 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid invitation file %s\n", cookie);
277 c->name = xstrdup(name);
279 // Send the node the contents of the invitation file
282 while((result = fread(buf, 1, sizeof(buf), f)))
283 sptps_send_record(&c->sptps, 0, buf, result);
284 sptps_send_record(&c->sptps, 1, buf, 0);
288 c->status.invitation_used = true;
290 logger(DEBUG_CONNECTIONS, LOG_INFO, "Invitation %s succesfully sent to %s (%s)", cookie, c->name, c->hostname);
294 bool id_h(connection_t *c, const char *request) {
295 char name[MAX_STRING_SIZE];
297 if(sscanf(request, "%*d " MAX_STRING " %2d.%3d", name, &c->protocol_major, &c->protocol_minor) < 2) {
298 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
303 /* Check if this is a control connection */
305 if(name[0] == '^' && !strcmp(name + 1, controlcookie)) {
306 c->status.control = true;
307 c->allow_request = CONTROL;
308 c->last_ping_time = now.tv_sec + 3600;
311 c->name = xstrdup("<control>");
313 return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
317 if(!invitation_key) {
318 logger(DEBUG_ALWAYS, LOG_ERR, "Got invitation from %s but we don't have an invitation key", c->hostname);
322 c->ecdsa = ecdsa_set_base64_public_key(name + 1);
324 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad invitation from %s", c->hostname);
328 c->status.invitation = true;
329 char *mykey = ecdsa_get_base64_public_key(invitation_key);
332 if(!send_request(c, "%d %s", ACK, mykey))
336 c->protocol_minor = 2;
338 return sptps_start(&c->sptps, c, false, false, invitation_key, c->ecdsa, "tinc invitation", 15, send_meta_sptps, receive_invitation_sptps);
341 /* Check if identity is a valid name */
343 if(!check_id(name)) {
344 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
345 c->hostname, "invalid name");
349 /* If this is an outgoing connection, make sure we are connected to the right host */
352 if(strcmp(c->name, name)) {
353 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
360 c->name = xstrdup(name);
363 /* Check if version matches */
365 if(c->protocol_major != myself->connection->protocol_major) {
366 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
367 c->name, c->hostname, c->protocol_major, c->protocol_minor);
371 if(bypass_security) {
373 init_configuration(&c->config_tree);
374 c->allow_request = ACK;
379 c->protocol_minor = 0;
381 if(!c->config_tree) {
382 init_configuration(&c->config_tree);
384 if(!read_host_config(c->config_tree, c->name)) {
385 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
390 read_ecdsa_public_key(c);
391 /* Ignore failures if no key known yet */
394 if(c->protocol_minor && !ecdsa_active(c->ecdsa))
395 c->protocol_minor = 1;
397 /* Forbid version rollback for nodes whose Ed25519 key we know */
399 if(ecdsa_active(c->ecdsa) && c->protocol_minor < 1) {
400 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
401 c->name, c->hostname, c->protocol_major, c->protocol_minor);
405 c->allow_request = METAKEY;
407 if(c->protocol_minor >= 2) {
408 c->allow_request = ACK;
409 char label[25 + strlen(myself->name) + strlen(c->name)];
412 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", myself->name, c->name);
414 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", c->name, myself->name);
416 return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, sizeof(label), send_meta_sptps, receive_meta_sptps);
418 return send_metakey(c);
422 bool send_metakey(connection_t *c) {
423 #ifdef DISABLE_LEGACY
426 if(!myself->connection->rsa) {
427 logger(DEBUG_CONNECTIONS, LOG_ERR, "Peer %s (%s) uses legacy protocol which we don't support", c->name, c->hostname);
431 if(!read_rsa_public_key(c))
434 /* We need to use a stream mode for the meta protocol. Use AES for this,
435 but try to match the key size with the one from the cipher selected
439 int keylen = cipher_keylength(myself->incipher);
441 c->outcipher = cipher_open_by_name("aes-128-cfb");
442 else if(keylen <= 24)
443 c->outcipher = cipher_open_by_name("aes-192-cfb");
445 c->outcipher = cipher_open_by_name("aes-256-cfb");
449 c->outbudget = cipher_budget(c->outcipher);
451 if(!(c->outdigest = digest_open_by_name("sha256", -1)))
454 const size_t len = rsa_size(c->rsa);
457 char hexkey[2 * len + 1];
459 /* Create a random key */
463 /* The message we send must be smaller than the modulus of the RSA key.
464 By definition, for a key of k bits, the following formula holds:
466 2^(k-1) <= modulus < 2^(k)
468 Where ^ means "to the power of", not "xor".
469 This means that to be sure, we must choose our message < 2^(k-1).
470 This can be done by setting the most significant bit to zero.
475 if(!cipher_set_key_from_rsa(c->outcipher, key, len, true))
478 if(debug_level >= DEBUG_SCARY_THINGS) {
479 bin2hex(key, hexkey, len);
480 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
483 /* Encrypt the random data
485 We do not use one of the PKCS padding schemes here.
486 This is allowed, because we encrypt a totally random string
487 with a length equal to that of the modulus of the RSA key.
490 if(!rsa_public_encrypt(c->rsa, key, len, enckey)) {
491 logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
495 /* Convert the encrypted random data to a hexadecimal formatted string */
497 bin2hex(enckey, hexkey, len);
499 /* Send the meta key */
501 bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
502 cipher_get_nid(c->outcipher),
503 digest_get_nid(c->outdigest), c->outmaclength,
504 c->outcompression, hexkey);
506 c->status.encryptout = true;
511 bool metakey_h(connection_t *c, const char *request) {
512 #ifdef DISABLE_LEGACY
515 if(!myself->connection->rsa)
518 char hexkey[MAX_STRING_SIZE];
519 int cipher, digest, maclength, compression;
520 const size_t len = rsa_size(myself->connection->rsa);
524 if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
525 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
529 /* Convert the challenge from hexadecimal back to binary */
531 int inlen = hex2bin(hexkey, enckey, sizeof(enckey));
533 /* Check if the length of the meta key is all right */
536 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
540 /* Decrypt the meta key */
542 if(!rsa_private_decrypt(myself->connection->rsa, enckey, len, key)) {
543 logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
547 if(debug_level >= DEBUG_SCARY_THINGS) {
548 bin2hex(key, hexkey, len);
549 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
552 /* Check and lookup cipher and digest algorithms */
555 if(!(c->incipher = cipher_open_by_nid(cipher)) || !cipher_set_key_from_rsa(c->incipher, key, len, false)) {
556 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
563 c->inbudget = cipher_budget(c->incipher);
566 if(!(c->indigest = digest_open_by_nid(digest, -1))) {
567 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
574 c->status.decryptin = true;
576 c->allow_request = CHALLENGE;
578 return send_challenge(c);
582 bool send_challenge(connection_t *c) {
583 #ifdef DISABLE_LEGACY
586 const size_t len = rsa_size(c->rsa);
587 char buffer[len * 2 + 1];
590 c->hischallenge = xrealloc(c->hischallenge, len);
592 /* Copy random data to the buffer */
594 randomize(c->hischallenge, len);
598 bin2hex(c->hischallenge, buffer, len);
600 /* Send the challenge */
602 return send_request(c, "%d %s", CHALLENGE, buffer);
606 bool challenge_h(connection_t *c, const char *request) {
607 #ifdef DISABLE_LEGACY
610 if(!myself->connection->rsa)
613 char buffer[MAX_STRING_SIZE];
614 const size_t len = rsa_size(myself->connection->rsa);
615 size_t digestlen = digest_length(c->indigest);
616 char digest[digestlen];
618 if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
619 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
623 /* Convert the challenge from hexadecimal back to binary */
625 int inlen = hex2bin(buffer, buffer, sizeof(buffer));
627 /* Check if the length of the challenge is all right */
630 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
634 /* Calculate the hash from the challenge we received */
636 if(!digest_create(c->indigest, buffer, len, digest))
639 /* Convert the hash to a hexadecimal formatted string */
641 bin2hex(digest, buffer, digestlen);
645 c->allow_request = CHAL_REPLY;
647 return send_request(c, "%d %s", CHAL_REPLY, buffer);
651 bool chal_reply_h(connection_t *c, const char *request) {
652 #ifdef DISABLE_LEGACY
655 char hishash[MAX_STRING_SIZE];
657 if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
658 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
663 /* Convert the hash to binary format */
665 int inlen = hex2bin(hishash, hishash, sizeof(hishash));
667 /* Check if the length of the hash is all right */
669 if(inlen != digest_length(c->outdigest)) {
670 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
675 /* Verify the hash */
677 if(!digest_verify(c->outdigest, c->hischallenge, rsa_size(c->rsa), hishash)) {
678 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
682 /* Identity has now been positively verified.
683 Send an acknowledgement with the rest of the information needed.
686 free(c->hischallenge);
687 c->hischallenge = NULL;
688 c->allow_request = ACK;
694 static bool send_upgrade(connection_t *c) {
695 #ifdef DISABLE_LEGACY
698 /* Special case when protocol_minor is 1: the other end is Ed25519 capable,
699 * but doesn't know our key yet. So send it now. */
701 char *pubkey = ecdsa_get_base64_public_key(myself->connection->ecdsa);
706 bool result = send_request(c, "%d %s", ACK, pubkey);
712 bool send_ack(connection_t *c) {
713 if(c->protocol_minor == 1)
714 return send_upgrade(c);
716 /* ACK message contains rest of the information the other end needs
717 to create node_t and edge_t structures. */
722 /* Estimate weight */
724 gettimeofday(&now, NULL);
725 c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
727 /* Check some options */
729 if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &choice) && choice) || myself->options & OPTION_INDIRECT)
730 c->options |= OPTION_INDIRECT;
732 if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY)
733 c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
735 if(myself->options & OPTION_PMTU_DISCOVERY)
736 c->options |= OPTION_PMTU_DISCOVERY;
738 choice = myself->options & OPTION_CLAMP_MSS;
739 get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice);
741 c->options |= OPTION_CLAMP_MSS;
743 if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight))
744 get_config_int(lookup_config(config_tree, "Weight"), &c->estimated_weight);
746 return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
749 static void send_everything(connection_t *c) {
750 /* Send all known subnets and edges */
752 if(disablebuggypeers) {
755 char pad[MAXBUFSIZE - MAXSIZE];
758 memset(&zeropkt, 0, sizeof(zeropkt));
759 zeropkt.pkt.len = MAXBUFSIZE;
760 send_tcppacket(c, &zeropkt.pkt);
764 for splay_each(subnet_t, s, myself->subnet_tree)
765 send_add_subnet(c, s);
770 for splay_each(node_t, n, node_tree) {
771 for splay_each(subnet_t, s, n->subnet_tree)
772 send_add_subnet(c, s);
774 for splay_each(edge_t, e, n->edge_tree)
779 static bool upgrade_h(connection_t *c, const char *request) {
780 char pubkey[MAX_STRING_SIZE];
782 if(sscanf(request, "%*d " MAX_STRING, pubkey) != 1) {
783 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name, c->hostname);
787 if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(c)) {
788 char *knownkey = ecdsa_get_base64_public_key(c->ecdsa);
789 bool different = strcmp(knownkey, pubkey);
792 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);
795 logger(DEBUG_ALWAYS, LOG_INFO, "Already have Ed25519 public key from %s (%s), ignoring.", c->name, c->hostname);
796 c->allow_request = TERMREQ;
797 return send_termreq(c);
800 c->ecdsa = ecdsa_set_base64_public_key(pubkey);
802 logger(DEBUG_ALWAYS, LOG_INFO, "Got bad Ed25519 public key from %s (%s), not upgrading.", c->name, c->hostname);
806 logger(DEBUG_ALWAYS, LOG_INFO, "Got Ed25519 public key from %s (%s), upgrading!", c->name, c->hostname);
807 append_config_file(c->name, "Ed25519PublicKey", pubkey);
808 c->allow_request = TERMREQ;
810 c->outgoing->timeout = 0;
811 return send_termreq(c);
814 bool ack_h(connection_t *c, const char *request) {
815 if(c->protocol_minor == 1)
816 return upgrade_h(c, request);
818 char hisport[MAX_STRING_SIZE];
824 if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
825 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
830 /* Check if we already have a node_t for him */
832 n = lookup_node(c->name);
836 n->name = xstrdup(c->name);
840 /* Oh dear, we already have a connection to this node. */
841 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
843 if(n->connection->outgoing) {
845 logger(DEBUG_ALWAYS, LOG_WARNING, "Two outgoing connections to the same node!");
847 c->outgoing = n->connection->outgoing;
849 n->connection->outgoing = NULL;
852 terminate_connection(n->connection, false);
853 /* Run graph algorithm to purge key and make sure up/down scripts are rerun with new IP addresses and stuff */
860 if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
861 c->options &= ~OPTION_PMTU_DISCOVERY;
862 options &= ~OPTION_PMTU_DISCOVERY;
864 c->options |= options;
866 if(get_config_int(lookup_config(c->config_tree, "PMTU"), &mtu) && mtu < n->mtu)
869 if(get_config_int(lookup_config(config_tree, "PMTU"), &mtu) && mtu < n->mtu)
872 if(get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice)) {
874 c->options |= OPTION_CLAMP_MSS;
876 c->options &= ~OPTION_CLAMP_MSS;
879 /* Activate this connection */
881 c->allow_request = ALL;
883 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
886 /* Send him everything we know */
890 /* Create an edge_t for this connection */
892 c->edge = new_edge();
893 c->edge->from = myself;
895 sockaddrcpy(&c->edge->address, &c->address);
896 sockaddr_setport(&c->edge->address, hisport);
898 socklen_t local_salen = sizeof(local_sa);
899 if (getsockname(c->socket, &local_sa.sa, &local_salen) < 0)
900 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get local socket address for connection with %s", c->name);
902 sockaddr_setport(&local_sa, myport);
903 c->edge->local_address = local_sa;
905 c->edge->weight = (weight + c->estimated_weight) / 2;
906 c->edge->connection = c;
907 c->edge->options = c->options;
911 /* Notify everyone of the new edge */
914 send_add_edge(c, c->edge);
916 send_add_edge(everyone, c->edge);
918 /* Run MST and SSSP algorithms */