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"
46 #include "ed25519/sha512.h"
49 int invitation_lifetime;
50 ecdsa_t *invitation_key = NULL;
52 static bool send_proxyrequest(connection_t *c) {
58 sockaddr2str(&c->address, &host, &port);
59 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!");
71 char s4req[9 + (proxyuser ? strlen(proxyuser) : 0)];
74 memcpy(s4req + 2, &c->address.in.sin_port, 2);
75 memcpy(s4req + 4, &c->address.in.sin_addr, 4);
78 memcpy(s4req + 8, proxyuser, strlen(proxyuser));
81 s4req[sizeof(s4req) - 1] = 0;
83 return send_meta(c, s4req, sizeof(s4req));
87 int len = 3 + 6 + (c->address.sa.sa_family == AF_INET ? 4 : 16);
91 len += 3 + strlen(proxyuser) + strlen(proxypass);
102 s5req[i++] = strlen(proxyuser);
103 memcpy(s5req + i, proxyuser, strlen(proxyuser));
104 i += strlen(proxyuser);
105 s5req[i++] = strlen(proxypass);
106 memcpy(s5req + i, proxypass, strlen(proxypass));
107 i += strlen(proxypass);
117 if(c->address.sa.sa_family == AF_INET) {
119 memcpy(s5req + i, &c->address.in.sin_addr, 4);
121 memcpy(s5req + i, &c->address.in.sin_port, 2);
124 } else if(c->address.sa.sa_family == AF_INET6) {
126 memcpy(s5req + i, &c->address.in6.sin6_addr, 16);
128 memcpy(s5req + i, &c->address.in6.sin6_port, 2);
132 logger(DEBUG_ALWAYS, LOG_ERR, "Address family %x not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
140 return send_meta(c, s5req, sizeof(s5req));
144 logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type not implemented yet");
151 logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type");
156 bool send_id(connection_t *c) {
157 gettimeofday(&c->start, NULL);
162 if(c->outgoing && !read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name)) {
165 minor = myself->connection->protocol_minor;
169 if(proxytype && c->outgoing)
170 if(!send_proxyrequest(c)) {
174 return send_request(c, "%d %s %d.%d", ID, myself->connection->name, myself->connection->protocol_major, minor);
177 static bool finalize_invitation(connection_t *c, const char *data, uint16_t len) {
180 if(strchr(data, '\n')) {
181 logger(DEBUG_ALWAYS, LOG_ERR, "Received invalid key from invited node %s (%s)!\n", c->name, c->hostname);
185 // Create a new host config file
186 char filename[PATH_MAX];
187 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
189 if(!access(filename, F_OK)) {
190 logger(DEBUG_ALWAYS, LOG_ERR, "Host config file for %s (%s) already exists!\n", c->name, c->hostname);
194 FILE *f = fopen(filename, "w");
197 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to create %s: %s\n", filename, strerror(errno));
201 fprintf(f, "Ed25519PublicKey = %s\n", data);
204 logger(DEBUG_CONNECTIONS, LOG_INFO, "Key successfully received from %s (%s)", c->name, c->hostname);
206 // Call invitation-accepted script
208 char *address, *port;
210 environment_init(&env);
211 environment_add(&env, "NODE=%s", c->name);
212 sockaddr2str(&c->address, &address, &port);
213 environment_add(&env, "REMOTEADDRESS=%s", address);
214 environment_add(&env, "NAME=%s", myself->name);
219 execute_script("invitation-accepted", &env);
221 environment_exit(&env);
223 sptps_send_record(&c->sptps, 2, data, 0);
227 static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
228 connection_t *c = handle;
234 if(type == 1 && c->status.invitation_used) {
235 return finalize_invitation(c, data, len);
238 if(type != 0 || len != 18 || c->status.invitation_used) {
242 // Recover the filename from the cookie and the key
243 char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
244 char hashbuf[18 + strlen(fingerprint)];
246 memcpy(hashbuf, data, 18);
247 memcpy(hashbuf + 18, fingerprint, sizeof(hashbuf) - 18);
248 sha512(hashbuf, sizeof(hashbuf), cookie);
249 b64encode_urlsafe(cookie, cookie, 18);
252 char filename[PATH_MAX], usedname[PATH_MAX];
253 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
254 snprintf(usedname, sizeof(usedname), "%s" SLASH "invitations" SLASH "%s.used", confbase, cookie);
256 // Atomically rename the invitation file
257 if(rename(filename, usedname)) {
258 if(errno == ENOENT) {
259 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
261 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to rename invitation %s\n", cookie);
267 // Check the timestamp of the invitation
270 if(stat(usedname, &st)) {
271 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat %s", usedname);
275 if(st.st_mtime + invitation_lifetime < now.tv_sec) {
276 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use expired invitation %s", c->hostname, cookie);
280 // Open the renamed file
281 FILE *f = fopen(usedname, "r");
284 logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to open invitation %s\n", cookie);
288 // Read the new node's Name from the file
290 fgets(buf, sizeof(buf), f);
291 size_t buflen = strlen(buf);
293 // Strip whitespace at the end
294 while(buflen && strchr(" \t\r\n", buf[buflen - 1])) {
298 // Split the first line into variable and value
299 len = strcspn(buf, " \t=");
300 char *name = buf + len;
301 name += strspn(name, " \t");
305 name += strspn(name, " \t");
310 // Check that it is a valid Name
311 if(!*buf || !*name || strcasecmp(buf, "Name") || !check_id(name) || !strcmp(name, myself->name)) {
312 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid invitation file %s\n", cookie);
318 c->name = xstrdup(name);
320 // Send the node the contents of the invitation file
324 while((result = fread(buf, 1, sizeof(buf), f))) {
325 sptps_send_record(&c->sptps, 0, buf, result);
328 sptps_send_record(&c->sptps, 1, buf, 0);
332 c->status.invitation_used = true;
334 logger(DEBUG_CONNECTIONS, LOG_INFO, "Invitation %s successfully sent to %s (%s)", cookie, c->name, c->hostname);
338 bool id_h(connection_t *c, const char *request) {
339 char name[MAX_STRING_SIZE];
341 if(sscanf(request, "%*d " MAX_STRING " %2d.%3d", name, &c->protocol_major, &c->protocol_minor) < 2) {
342 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
347 /* Check if this is a control connection */
349 if(name[0] == '^' && !strcmp(name + 1, controlcookie)) {
350 c->status.control = true;
351 c->allow_request = CONTROL;
352 c->last_ping_time = now.tv_sec + 3600;
355 c->name = xstrdup("<control>");
361 return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
365 if(!invitation_key) {
366 logger(DEBUG_ALWAYS, LOG_ERR, "Got invitation from %s but we don't have an invitation key", c->hostname);
370 c->ecdsa = ecdsa_set_base64_public_key(name + 1);
373 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad invitation from %s", c->hostname);
377 c->status.invitation = true;
378 char *mykey = ecdsa_get_base64_public_key(invitation_key);
388 if(!send_request(c, "%d %s", ACK, mykey)) {
394 c->protocol_minor = 2;
396 return sptps_start(&c->sptps, c, false, false, invitation_key, c->ecdsa, "tinc invitation", 15, send_meta_sptps, receive_invitation_sptps);
399 /* Check if identity is a valid name */
401 if(!check_id(name) || !strcmp(name, myself->name)) {
402 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
403 c->hostname, "invalid name");
407 /* If this is an outgoing connection, make sure we are connected to the right host */
410 if(strcmp(c->name, name)) {
411 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
417 c->name = xstrdup(name);
420 /* Check if version matches */
422 if(c->protocol_major != myself->connection->protocol_major) {
423 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
424 c->name, c->hostname, c->protocol_major, c->protocol_minor);
428 if(bypass_security) {
429 if(!c->config_tree) {
430 init_configuration(&c->config_tree);
433 c->allow_request = ACK;
443 c->protocol_minor = 0;
446 if(!c->config_tree) {
447 init_configuration(&c->config_tree);
449 if(!read_host_config(c->config_tree, c->name, false)) {
450 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
455 read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name);
458 /* Ignore failures if no key known yet */
461 if(c->protocol_minor && !ecdsa_active(c->ecdsa)) {
462 c->protocol_minor = 1;
465 /* Forbid version rollback for nodes whose Ed25519 key we know */
467 if(ecdsa_active(c->ecdsa) && c->protocol_minor < 1) {
468 logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
469 c->name, c->hostname, c->protocol_major, c->protocol_minor);
473 c->allow_request = METAKEY;
479 if(c->protocol_minor >= 2) {
480 c->allow_request = ACK;
481 char label[25 + strlen(myself->name) + strlen(c->name)];
484 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", myself->name, c->name);
486 snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", c->name, myself->name);
489 return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, sizeof(label), send_meta_sptps, receive_meta_sptps);
491 return send_metakey(c);
495 #ifndef DISABLE_LEGACY
496 bool send_metakey(connection_t *c) {
497 if(!myself->connection->rsa) {
498 logger(DEBUG_CONNECTIONS, LOG_ERR, "Peer %s (%s) uses legacy protocol which we don't support", c->name, c->hostname);
502 if(!read_rsa_public_key(&c->rsa, c->config_tree, c->name)) {
506 /* We need to use a stream mode for the meta protocol. Use AES for this,
507 but try to match the key size with the one from the cipher selected
511 int keylen = cipher_keylength(myself->incipher);
514 c->outcipher = cipher_open_by_name("aes-128-cfb");
515 } else if(keylen <= 24) {
516 c->outcipher = cipher_open_by_name("aes-192-cfb");
518 c->outcipher = cipher_open_by_name("aes-256-cfb");
525 c->outbudget = cipher_budget(c->outcipher);
527 if(!(c->outdigest = digest_open_by_name("sha256", -1))) {
531 const size_t len = rsa_size(c->rsa);
534 char hexkey[2 * len + 1];
536 /* Create a random key */
540 /* The message we send must be smaller than the modulus of the RSA key.
541 By definition, for a key of k bits, the following formula holds:
543 2^(k-1) <= modulus < 2^(k)
545 Where ^ means "to the power of", not "xor".
546 This means that to be sure, we must choose our message < 2^(k-1).
547 This can be done by setting the most significant bit to zero.
552 if(!cipher_set_key_from_rsa(c->outcipher, key, len, true)) {
556 if(debug_level >= DEBUG_SCARY_THINGS) {
557 bin2hex(key, hexkey, len);
558 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
561 /* Encrypt the random data
563 We do not use one of the PKCS padding schemes here.
564 This is allowed, because we encrypt a totally random string
565 with a length equal to that of the modulus of the RSA key.
568 if(!rsa_public_encrypt(c->rsa, key, len, enckey)) {
569 logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
573 /* Convert the encrypted random data to a hexadecimal formatted string */
575 bin2hex(enckey, hexkey, len);
577 /* Send the meta key */
579 bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
580 cipher_get_nid(c->outcipher),
581 digest_get_nid(c->outdigest), c->outmaclength,
582 c->outcompression, hexkey);
584 c->status.encryptout = true;
588 bool metakey_h(connection_t *c, const char *request) {
589 if(!myself->connection->rsa) {
593 char hexkey[MAX_STRING_SIZE];
594 int cipher, digest, maclength, compression;
595 const size_t len = rsa_size(myself->connection->rsa);
599 if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
600 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
604 /* Convert the challenge from hexadecimal back to binary */
606 size_t inlen = hex2bin(hexkey, enckey, sizeof(enckey));
608 /* Check if the length of the meta key is all right */
611 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
615 /* Decrypt the meta key */
617 if(!rsa_private_decrypt(myself->connection->rsa, enckey, len, key)) {
618 logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
622 if(debug_level >= DEBUG_SCARY_THINGS) {
623 bin2hex(key, hexkey, len);
624 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
627 /* Check and lookup cipher and digest algorithms */
630 if(!(c->incipher = cipher_open_by_nid(cipher)) || !cipher_set_key_from_rsa(c->incipher, key, len, false)) {
631 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
635 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null cipher");
639 c->inbudget = cipher_budget(c->incipher);
642 if(!(c->indigest = digest_open_by_nid(digest, -1))) {
643 logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
647 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null digest");
651 c->status.decryptin = true;
653 c->allow_request = CHALLENGE;
655 return send_challenge(c);
658 bool send_challenge(connection_t *c) {
659 const size_t len = rsa_size(c->rsa);
660 char buffer[len * 2 + 1];
662 c->hischallenge = xrealloc(c->hischallenge, len);
664 /* Copy random data to the buffer */
666 randomize(c->hischallenge, len);
670 bin2hex(c->hischallenge, buffer, len);
672 /* Send the challenge */
674 return send_request(c, "%d %s", CHALLENGE, buffer);
677 bool challenge_h(connection_t *c, const char *request) {
678 if(!myself->connection->rsa) {
682 char buffer[MAX_STRING_SIZE];
683 const size_t len = rsa_size(myself->connection->rsa);
685 if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
686 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
690 /* Check if the length of the challenge is all right */
692 if(strlen(buffer) != (size_t)len * 2) {
693 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
697 c->mychallenge = xrealloc(c->mychallenge, len);
699 /* Convert the challenge from hexadecimal back to binary */
701 hex2bin(buffer, c->mychallenge, len);
703 /* The rest is done by send_chal_reply() */
705 c->allow_request = CHAL_REPLY;
708 return send_chal_reply(c);
714 bool send_chal_reply(connection_t *c) {
715 const size_t len = rsa_size(myself->connection->rsa);
716 size_t digestlen = digest_length(c->indigest);
717 char digest[digestlen * 2 + 1];
719 /* Calculate the hash from the challenge we received */
721 if(!digest_create(c->indigest, c->mychallenge, len, digest)) {
725 free(c->mychallenge);
726 c->mychallenge = NULL;
728 /* Convert the hash to a hexadecimal formatted string */
730 bin2hex(digest, digest, digestlen);
734 return send_request(c, "%d %s", CHAL_REPLY, digest);
737 bool chal_reply_h(connection_t *c, const char *request) {
738 char hishash[MAX_STRING_SIZE];
740 if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
741 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
746 /* Convert the hash to binary format */
748 size_t inlen = hex2bin(hishash, hishash, sizeof(hishash));
750 /* Check if the length of the hash is all right */
752 if(inlen != digest_length(c->outdigest)) {
753 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
758 /* Verify the hash */
760 if(!digest_verify(c->outdigest, c->hischallenge, rsa_size(c->rsa), hishash)) {
761 logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
765 /* Identity has now been positively verified.
766 Send an acknowledgement with the rest of the information needed.
769 free(c->hischallenge);
770 c->hischallenge = NULL;
771 c->allow_request = ACK;
780 static bool send_upgrade(connection_t *c) {
781 /* Special case when protocol_minor is 1: the other end is Ed25519 capable,
782 * but doesn't know our key yet. So send it now. */
784 char *pubkey = ecdsa_get_base64_public_key(myself->connection->ecdsa);
790 bool result = send_request(c, "%d %s", ACK, pubkey);
795 bool send_metakey(connection_t *c) {
800 bool metakey_h(connection_t *c, const char *request) {
806 bool send_challenge(connection_t *c) {
811 bool challenge_h(connection_t *c, const char *request) {
817 bool send_chal_reply(connection_t *c) {
822 bool chal_reply_h(connection_t *c, const char *request) {
828 static bool send_upgrade(connection_t *c) {
834 bool send_ack(connection_t *c) {
835 if(c->protocol_minor == 1) {
836 return send_upgrade(c);
839 /* ACK message contains rest of the information the other end needs
840 to create node_t and edge_t structures. */
845 /* Estimate weight */
847 gettimeofday(&now, NULL);
848 c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
850 /* Check some options */
852 if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &choice) && choice) || myself->options & OPTION_INDIRECT) {
853 c->options |= OPTION_INDIRECT;
856 if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY) {
857 c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
860 if(myself->options & OPTION_PMTU_DISCOVERY && !(c->options & OPTION_TCPONLY)) {
861 c->options |= OPTION_PMTU_DISCOVERY;
864 choice = myself->options & OPTION_CLAMP_MSS;
865 get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice);
868 c->options |= OPTION_CLAMP_MSS;
871 if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight)) {
872 get_config_int(lookup_config(config_tree, "Weight"), &c->estimated_weight);
875 return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
878 static void send_everything(connection_t *c) {
879 /* Send all known subnets and edges */
881 if(disablebuggypeers) {
884 char pad[MAXBUFSIZE - MAXSIZE];
887 memset(&zeropkt, 0, sizeof(zeropkt));
888 zeropkt.pkt.len = MAXBUFSIZE;
889 send_tcppacket(c, &zeropkt.pkt);
893 for splay_each(subnet_t, s, myself->subnet_tree) {
894 send_add_subnet(c, s);
900 for splay_each(node_t, n, node_tree) {
901 for splay_each(subnet_t, s, n->subnet_tree) {
902 send_add_subnet(c, s);
905 for splay_each(edge_t, e, n->edge_tree) {
911 static bool upgrade_h(connection_t *c, const char *request) {
912 char pubkey[MAX_STRING_SIZE];
914 if(sscanf(request, "%*d " MAX_STRING, pubkey) != 1) {
915 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name, c->hostname);
919 if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name)) {
920 char *knownkey = ecdsa_get_base64_public_key(c->ecdsa);
921 bool different = strcmp(knownkey, pubkey);
925 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);
929 logger(DEBUG_ALWAYS, LOG_INFO, "Already have Ed25519 public key from %s (%s), ignoring.", c->name, c->hostname);
930 c->allow_request = TERMREQ;
931 return send_termreq(c);
934 c->ecdsa = ecdsa_set_base64_public_key(pubkey);
937 logger(DEBUG_ALWAYS, LOG_INFO, "Got bad Ed25519 public key from %s (%s), not upgrading.", c->name, c->hostname);
941 logger(DEBUG_ALWAYS, LOG_INFO, "Got Ed25519 public key from %s (%s), upgrading!", c->name, c->hostname);
942 append_config_file(c->name, "Ed25519PublicKey", pubkey);
943 c->allow_request = TERMREQ;
946 c->outgoing->timeout = 0;
949 return send_termreq(c);
952 bool ack_h(connection_t *c, const char *request) {
953 if(c->protocol_minor == 1) {
954 return upgrade_h(c, request);
957 char hisport[MAX_STRING_SIZE];
963 if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
964 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
969 /* Check if we already have a node_t for him */
971 n = lookup_node(c->name);
975 n->name = xstrdup(c->name);
979 /* Oh dear, we already have a connection to this node. */
980 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
982 if(n->connection->outgoing) {
984 logger(DEBUG_ALWAYS, LOG_WARNING, "Two outgoing connections to the same node!");
986 c->outgoing = n->connection->outgoing;
989 n->connection->outgoing = NULL;
992 terminate_connection(n->connection, false);
993 /* Run graph algorithm to purge key and make sure up/down scripts are rerun with new IP addresses and stuff */
1001 if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
1002 c->options &= ~OPTION_PMTU_DISCOVERY;
1003 options &= ~OPTION_PMTU_DISCOVERY;
1006 c->options |= options;
1008 if(get_config_int(lookup_config(c->config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
1012 if(get_config_int(lookup_config(config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
1016 if(get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice)) {
1018 c->options |= OPTION_CLAMP_MSS;
1020 c->options &= ~OPTION_CLAMP_MSS;
1024 /* Activate this connection */
1026 c->allow_request = ALL;
1028 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
1031 /* Send him everything we know */
1035 /* Create an edge_t for this connection */
1037 c->edge = new_edge();
1038 c->edge->from = myself;
1040 sockaddrcpy(&c->edge->address, &c->address);
1041 sockaddr_setport(&c->edge->address, hisport);
1042 sockaddr_t local_sa;
1043 socklen_t local_salen = sizeof(local_sa);
1045 if(getsockname(c->socket, &local_sa.sa, &local_salen) < 0) {
1046 logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get local socket address for connection with %s", c->name);
1048 sockaddr_setport(&local_sa, myport);
1049 c->edge->local_address = local_sa;
1052 c->edge->weight = (weight + c->estimated_weight) / 2;
1053 c->edge->connection = c;
1054 c->edge->options = c->options;
1058 /* Notify everyone of the new edge */
1061 send_add_edge(c, c->edge);
1063 send_add_edge(everyone, c->edge);
1066 /* Run MST and SSSP algorithms */