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);
220 execute_script("invitation-accepted", &env);
222 environment_exit(&env);
224 sptps_send_record(&c->sptps, 2, data, 0);
228 static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
229 connection_t *c = handle;
235 if(type == 1 && c->status.invitation_used) {
236 return finalize_invitation(c, data, len);
239 if(type != 0 || len != 18 || c->status.invitation_used) {
243 // Recover the filename from the cookie and the key
244 char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
245 char hashbuf[18 + strlen(fingerprint)];
247 memcpy(hashbuf, data, 18);
248 memcpy(hashbuf + 18, fingerprint, sizeof(hashbuf) - 18);
249 sha512(hashbuf, sizeof(hashbuf), cookie);
250 b64encode_urlsafe(cookie, cookie, 18);
253 char filename[PATH_MAX], usedname[PATH_MAX];
254 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
255 snprintf(usedname, sizeof(usedname), "%s" SLASH "invitations" SLASH "%s.used", confbase, cookie);
257 // Atomically rename the invitation file
258 if(rename(filename, usedname)) {
259 if(errno == ENOENT) {
260 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
262 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to rename invitation %s\n", cookie);
268 // Check the timestamp of the invitation
271 if(stat(usedname, &st)) {
272 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat %s", usedname);
276 if(st.st_mtime + invitation_lifetime < now.tv_sec) {
277 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use expired invitation %s", c->hostname, cookie);
281 // Open the renamed file
282 FILE *f = fopen(usedname, "r");
285 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to open invitation %s\n", cookie);
289 // Read the new node's Name from the file
291 fgets(buf, sizeof(buf), f);
292 size_t buflen = strlen(buf);
294 // Strip whitespace at the end
295 while(buflen && strchr(" \t\r\n", buf[buflen - 1])) {
299 // Split the first line into variable and value
300 len = strcspn(buf, " \t=");
301 char *name = buf + len;
302 name += strspn(name, " \t");
306 name += strspn(name, " \t");
311 // Check that it is a valid Name
312 if(!*buf || !*name || strcasecmp(buf, "Name") || !check_id(name) || !strcmp(name, myself->name)) {
313 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid invitation file %s\n", cookie);
319 c->name = xstrdup(name);
321 // Send the node the contents of the invitation file
325 while((result = fread(buf, 1, sizeof(buf), f))) {
326 sptps_send_record(&c->sptps, 0, buf, result);
329 sptps_send_record(&c->sptps, 1, buf, 0);
333 c->status.invitation_used = true;
335 logger(DEBUG_CONNECTIONS, LOG_INFO, "Invitation %s successfully sent to %s (%s)", cookie, c->name, c->hostname);
339 bool id_h(connection_t *c, const char *request) {
340 char name[MAX_STRING_SIZE];
342 if(sscanf(request, "%*d " MAX_STRING " %2d.%3d", name, &c->protocol_major, &c->protocol_minor) < 2) {
343 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
348 /* Check if this is a control connection */
350 if(name[0] == '^' && !strcmp(name + 1, controlcookie)) {
351 c->status.control = true;
352 c->allow_request = CONTROL;
353 c->last_ping_time = now.tv_sec + 3600;
356 c->name = xstrdup("<control>");
362 return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
366 if(!invitation_key) {
367 logger(DEBUG_ALWAYS, LOG_ERR, "Got invitation from %s but we don't have an invitation key", c->hostname);
371 c->ecdsa = ecdsa_set_base64_public_key(name + 1);
374 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad invitation from %s", c->hostname);
378 c->status.invitation = true;
379 char *mykey = ecdsa_get_base64_public_key(invitation_key);
389 if(!send_request(c, "%d %s", ACK, mykey)) {
395 c->protocol_minor = 2;
397 return sptps_start(&c->sptps, c, false, false, invitation_key, c->ecdsa, "tinc invitation", 15, send_meta_sptps, receive_invitation_sptps);
400 /* Check if identity is a valid name */
402 if(!check_id(name) || !strcmp(name, myself->name)) {
403 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
404 c->hostname, "invalid name");
408 /* If this is an outgoing connection, make sure we are connected to the right host */
411 if(strcmp(c->name, name)) {
412 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
418 c->name = xstrdup(name);
421 /* Check if version matches */
423 if(c->protocol_major != myself->connection->protocol_major) {
424 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
425 c->name, c->hostname, c->protocol_major, c->protocol_minor);
429 if(bypass_security) {
430 if(!c->config_tree) {
431 init_configuration(&c->config_tree);
434 c->allow_request = ACK;
444 c->protocol_minor = 0;
447 if(!c->config_tree) {
448 init_configuration(&c->config_tree);
450 if(!read_host_config(c->config_tree, c->name, false)) {
451 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
456 read_ecdsa_public_key(c);
459 /* Ignore failures if no key known yet */
462 if(c->protocol_minor && !ecdsa_active(c->ecdsa)) {
463 c->protocol_minor = 1;
466 /* Forbid version rollback for nodes whose Ed25519 key we know */
468 if(ecdsa_active(c->ecdsa) && c->protocol_minor < 1) {
469 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
470 c->name, c->hostname, c->protocol_major, c->protocol_minor);
474 c->allow_request = METAKEY;
480 if(c->protocol_minor >= 2) {
481 c->allow_request = ACK;
482 char label[25 + strlen(myself->name) + strlen(c->name)];
485 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", myself->name, c->name);
487 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", c->name, myself->name);
490 return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, sizeof(label), send_meta_sptps, receive_meta_sptps);
492 return send_metakey(c);
496 #ifndef DISABLE_LEGACY
497 bool send_metakey(connection_t *c) {
498 if(!myself->connection->rsa) {
499 logger(DEBUG_CONNECTIONS, LOG_ERR, "Peer %s (%s) uses legacy protocol which we don't support", c->name, c->hostname);
503 if(!read_rsa_public_key(c)) {
507 /* We need to use a stream mode for the meta protocol. Use AES for this,
508 but try to match the key size with the one from the cipher selected
512 int keylen = cipher_keylength(myself->incipher);
515 c->outcipher = cipher_open_by_name("aes-128-cfb");
516 } else if(keylen <= 24) {
517 c->outcipher = cipher_open_by_name("aes-192-cfb");
519 c->outcipher = cipher_open_by_name("aes-256-cfb");
526 c->outbudget = cipher_budget(c->outcipher);
528 if(!(c->outdigest = digest_open_by_name("sha256", -1))) {
532 const size_t len = rsa_size(c->rsa);
535 char hexkey[2 * len + 1];
537 /* Create a random key */
541 /* The message we send must be smaller than the modulus of the RSA key.
542 By definition, for a key of k bits, the following formula holds:
544 2^(k-1) <= modulus < 2^(k)
546 Where ^ means "to the power of", not "xor".
547 This means that to be sure, we must choose our message < 2^(k-1).
548 This can be done by setting the most significant bit to zero.
553 if(!cipher_set_key_from_rsa(c->outcipher, key, len, true)) {
557 if(debug_level >= DEBUG_SCARY_THINGS) {
558 bin2hex(key, hexkey, len);
559 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
562 /* Encrypt the random data
564 We do not use one of the PKCS padding schemes here.
565 This is allowed, because we encrypt a totally random string
566 with a length equal to that of the modulus of the RSA key.
569 if(!rsa_public_encrypt(c->rsa, key, len, enckey)) {
570 logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
574 /* Convert the encrypted random data to a hexadecimal formatted string */
576 bin2hex(enckey, hexkey, len);
578 /* Send the meta key */
580 bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
581 cipher_get_nid(c->outcipher),
582 digest_get_nid(c->outdigest), c->outmaclength,
583 c->outcompression, hexkey);
585 c->status.encryptout = true;
589 bool metakey_h(connection_t *c, const char *request) {
590 if(!myself->connection->rsa) {
594 char hexkey[MAX_STRING_SIZE];
595 int cipher, digest, maclength, compression;
596 const size_t len = rsa_size(myself->connection->rsa);
600 if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
601 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
605 /* Convert the challenge from hexadecimal back to binary */
607 size_t inlen = hex2bin(hexkey, enckey, sizeof(enckey));
609 /* Check if the length of the meta key is all right */
612 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
616 /* Decrypt the meta key */
618 if(!rsa_private_decrypt(myself->connection->rsa, enckey, len, key)) {
619 logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
623 if(debug_level >= DEBUG_SCARY_THINGS) {
624 bin2hex(key, hexkey, len);
625 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
628 /* Check and lookup cipher and digest algorithms */
631 if(!(c->incipher = cipher_open_by_nid(cipher)) || !cipher_set_key_from_rsa(c->incipher, key, len, false)) {
632 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
636 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null cipher");
640 c->inbudget = cipher_budget(c->incipher);
643 if(!(c->indigest = digest_open_by_nid(digest, -1))) {
644 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
648 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null digest");
652 c->status.decryptin = true;
654 c->allow_request = CHALLENGE;
656 return send_challenge(c);
659 bool send_challenge(connection_t *c) {
660 const size_t len = rsa_size(c->rsa);
661 char buffer[len * 2 + 1];
663 c->hischallenge = xrealloc(c->hischallenge, len);
665 /* Copy random data to the buffer */
667 randomize(c->hischallenge, len);
671 bin2hex(c->hischallenge, buffer, len);
673 /* Send the challenge */
675 return send_request(c, "%d %s", CHALLENGE, buffer);
678 bool challenge_h(connection_t *c, const char *request) {
679 if(!myself->connection->rsa) {
683 char buffer[MAX_STRING_SIZE];
684 const size_t len = rsa_size(myself->connection->rsa);
686 if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
687 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
691 /* Check if the length of the challenge is all right */
693 if(strlen(buffer) != (size_t)len * 2) {
694 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
698 c->mychallenge = xrealloc(c->mychallenge, len);
700 /* Convert the challenge from hexadecimal back to binary */
702 hex2bin(buffer, c->mychallenge, len);
704 /* The rest is done by send_chal_reply() */
706 c->allow_request = CHAL_REPLY;
709 return send_chal_reply(c);
715 bool send_chal_reply(connection_t *c) {
716 const size_t len = rsa_size(myself->connection->rsa);
717 size_t digestlen = digest_length(c->indigest);
718 char digest[digestlen * 2 + 1];
720 /* Calculate the hash from the challenge we received */
722 if(!digest_create(c->indigest, c->mychallenge, len, digest)) {
726 free(c->mychallenge);
727 c->mychallenge = NULL;
729 /* Convert the hash to a hexadecimal formatted string */
731 bin2hex(digest, digest, digestlen);
735 return send_request(c, "%d %s", CHAL_REPLY, digest);
738 bool chal_reply_h(connection_t *c, const char *request) {
739 char hishash[MAX_STRING_SIZE];
741 if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
742 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
747 /* Convert the hash to binary format */
749 size_t inlen = hex2bin(hishash, hishash, sizeof(hishash));
751 /* Check if the length of the hash is all right */
753 if(inlen != digest_length(c->outdigest)) {
754 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
759 /* Verify the hash */
761 if(!digest_verify(c->outdigest, c->hischallenge, rsa_size(c->rsa), hishash)) {
762 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
766 /* Identity has now been positively verified.
767 Send an acknowledgement with the rest of the information needed.
770 free(c->hischallenge);
771 c->hischallenge = NULL;
772 c->allow_request = ACK;
781 static bool send_upgrade(connection_t *c) {
782 /* Special case when protocol_minor is 1: the other end is Ed25519 capable,
783 * but doesn't know our key yet. So send it now. */
785 char *pubkey = ecdsa_get_base64_public_key(myself->connection->ecdsa);
791 bool result = send_request(c, "%d %s", ACK, pubkey);
796 bool send_metakey(connection_t *c) {
801 bool metakey_h(connection_t *c, const char *request) {
807 bool send_challenge(connection_t *c) {
812 bool challenge_h(connection_t *c, const char *request) {
818 bool send_chal_reply(connection_t *c) {
823 bool chal_reply_h(connection_t *c, const char *request) {
829 static bool send_upgrade(connection_t *c) {
835 bool send_ack(connection_t *c) {
836 if(c->protocol_minor == 1) {
837 return send_upgrade(c);
840 /* ACK message contains rest of the information the other end needs
841 to create node_t and edge_t structures. */
846 /* Estimate weight */
848 gettimeofday(&now, NULL);
849 c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
851 /* Check some options */
853 if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &choice) && choice) || myself->options & OPTION_INDIRECT) {
854 c->options |= OPTION_INDIRECT;
857 if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY) {
858 c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
861 if(myself->options & OPTION_PMTU_DISCOVERY && !(c->options & OPTION_TCPONLY)) {
862 c->options |= OPTION_PMTU_DISCOVERY;
865 choice = myself->options & OPTION_CLAMP_MSS;
866 get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice);
869 c->options |= OPTION_CLAMP_MSS;
872 if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight)) {
873 get_config_int(lookup_config(config_tree, "Weight"), &c->estimated_weight);
876 return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
879 static void send_everything(connection_t *c) {
880 /* Send all known subnets and edges */
882 if(disablebuggypeers) {
885 char pad[MAXBUFSIZE - MAXSIZE];
888 memset(&zeropkt, 0, sizeof(zeropkt));
889 zeropkt.pkt.len = MAXBUFSIZE;
890 send_tcppacket(c, &zeropkt.pkt);
894 for splay_each(subnet_t, s, myself->subnet_tree) {
895 send_add_subnet(c, s);
901 for splay_each(node_t, n, node_tree) {
902 for splay_each(subnet_t, s, n->subnet_tree) {
903 send_add_subnet(c, s);
906 for splay_each(edge_t, e, n->edge_tree) {
912 static bool upgrade_h(connection_t *c, const char *request) {
913 char pubkey[MAX_STRING_SIZE];
915 if(sscanf(request, "%*d " MAX_STRING, pubkey) != 1) {
916 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name, c->hostname);
920 if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(c)) {
921 char *knownkey = ecdsa_get_base64_public_key(c->ecdsa);
922 bool different = strcmp(knownkey, pubkey);
926 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);
930 logger(DEBUG_ALWAYS, LOG_INFO, "Already have Ed25519 public key from %s (%s), ignoring.", c->name, c->hostname);
931 c->allow_request = TERMREQ;
932 return send_termreq(c);
935 c->ecdsa = ecdsa_set_base64_public_key(pubkey);
938 logger(DEBUG_ALWAYS, LOG_INFO, "Got bad Ed25519 public key from %s (%s), not upgrading.", c->name, c->hostname);
942 logger(DEBUG_ALWAYS, LOG_INFO, "Got Ed25519 public key from %s (%s), upgrading!", c->name, c->hostname);
943 append_config_file(c->name, "Ed25519PublicKey", pubkey);
944 c->allow_request = TERMREQ;
947 c->outgoing->timeout = 0;
950 return send_termreq(c);
953 bool ack_h(connection_t *c, const char *request) {
954 if(c->protocol_minor == 1) {
955 return upgrade_h(c, request);
958 char hisport[MAX_STRING_SIZE];
964 if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
965 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
970 /* Check if we already have a node_t for him */
972 n = lookup_node(c->name);
976 n->name = xstrdup(c->name);
980 /* Oh dear, we already have a connection to this node. */
981 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
983 if(n->connection->outgoing) {
985 logger(DEBUG_ALWAYS, LOG_WARNING, "Two outgoing connections to the same node!");
987 c->outgoing = n->connection->outgoing;
990 n->connection->outgoing = NULL;
993 terminate_connection(n->connection, false);
994 /* Run graph algorithm to purge key and make sure up/down scripts are rerun with new IP addresses and stuff */
1002 if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
1003 c->options &= ~OPTION_PMTU_DISCOVERY;
1004 options &= ~OPTION_PMTU_DISCOVERY;
1007 c->options |= options;
1009 if(get_config_int(lookup_config(c->config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
1013 if(get_config_int(lookup_config(config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
1017 if(get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice)) {
1019 c->options |= OPTION_CLAMP_MSS;
1021 c->options &= ~OPTION_CLAMP_MSS;
1025 /* Activate this connection */
1027 c->allow_request = ALL;
1029 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
1032 /* Send him everything we know */
1036 /* Create an edge_t for this connection */
1038 c->edge = new_edge();
1039 c->edge->from = myself;
1041 sockaddrcpy(&c->edge->address, &c->address);
1042 sockaddr_setport(&c->edge->address, hisport);
1043 sockaddr_t local_sa;
1044 socklen_t local_salen = sizeof(local_sa);
1046 if(getsockname(c->socket, &local_sa.sa, &local_salen) < 0) {
1047 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get local socket address for connection with %s", c->name);
1049 sockaddr_setport(&local_sa, myport);
1050 c->edge->local_address = local_sa;
1053 c->edge->weight = (weight + c->estimated_weight) / 2;
1054 c->edge->connection = c;
1055 c->edge->options = c->options;
1059 /* Notify everyone of the new edge */
1062 send_add_edge(c, c->edge);
1064 send_add_edge(everyone, c->edge);
1067 /* Run MST and SSSP algorithms */