X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=36e10c40ea9ac8bfe5130c9105e74dacb0872662;hp=20f66447c2a8ddc79f9a284b5522aa8513b1615f;hb=a4938b22e7502579ce44cac42410111db11256eb;hpb=20301888b7a0a206119d2cfc48ccf1a667bb4add diff --git a/src/protocol.c b/src/protocol.c index 20f66447..36e10c40 100644 --- a/src/protocol.c +++ b/src/protocol.c @@ -1,7 +1,7 @@ /* protocol.c -- handle the meta-protocol - Copyright (C) 1999,2000 Ivo Timmermans , - 2000 Guus Sliepen + Copyright (C) 1999-2001 Ivo Timmermans , + 2000,2001 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: protocol.c,v 1.28.4.42 2000/10/16 19:04:47 guus Exp $ + $Id: protocol.c,v 1.28.4.121 2001/11/16 17:39:59 zarq Exp $ */ #include "config.h" @@ -30,23 +30,37 @@ #include #include #include +#include +#include #include #include +#include +#include #include #include +#include +#include + +#ifndef HAVE_RAND_PSEUDO_BYTES +#define RAND_pseudo_bytes RAND_bytes +#endif #include "conf.h" -#include "encr.h" #include "net.h" -#include "netutl.h" #include "protocol.h" #include "meta.h" +#include "connection.h" +#include "node.h" +#include "edge.h" +#include "graph.h" #include "system.h" +int mykeyused = 0; + int check_id(char *id) { int i; @@ -54,21 +68,23 @@ int check_id(char *id) for (i = 0; i < strlen(id); i++) if(!isalnum(id[i]) && id[i] != '_') return -1; - + return 0; } -/* Generic request routines - takes care of logging and error detection as well */ +/* Generic request routines - takes care of logging and error + detection as well */ -int send_request(conn_list_t *cl, const char *format, ...) +int send_request(connection_t *c, const char *format, ...) { va_list args; char buffer[MAXBUFSIZE]; int len, request; cp - /* Use vsnprintf instead of vasprintf: faster, no memory fragmentation, cleanup is automatic, - and there is a limit on the input buffer anyway */ + /* Use vsnprintf instead of vasprintf: faster, no memory + fragmentation, cleanup is automatic, and there is a limit on the + input buffer anyway */ va_start(args, format); len = vsnprintf(buffer, MAXBUFSIZE, format, args); @@ -77,218 +93,364 @@ cp if(len < 0 || len > MAXBUFSIZE-1) { - syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname); + syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], c->name, c->hostname); return -1; } - len++; - if(debug_lvl >= DEBUG_PROTOCOL) - syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname); + { + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], c->name, c->hostname, buffer); + else + syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname); + } + buffer[len++] = '\n'; cp - return send_meta(cl, buffer, len); + return send_meta(c, buffer, len); } -int receive_request(conn_list_t *cl) +int receive_request(connection_t *c) { int request; -cp - if(sscanf(cl->buffer, "%d", &request) == 1) +cp + if(sscanf(c->buffer, "%d", &request) == 1) { - if((request < 0) || (request > 255) || (request_handlers[request] == NULL)) + if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL)) { - syslog(LOG_ERR, _("Unknown request from %s (%s)"), - cl->name, cl->hostname); + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"), + c->name, c->hostname, c->buffer); + else + syslog(LOG_ERR, _("Unknown request from %s (%s)"), + c->name, c->hostname); + return -1; } else { - if(debug_lvl > DEBUG_PROTOCOL) - syslog(LOG_DEBUG, _("Got %s from %s (%s)"), - request_name[request], cl->name, cl->hostname); + if(debug_lvl >= DEBUG_PROTOCOL) + { + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"), + request_name[request], c->name, c->hostname, c->buffer); + else + syslog(LOG_DEBUG, _("Got %s from %s (%s)"), + request_name[request], c->name, c->hostname); + } } - if(request_handlers[request](cl)) + + if((c->allow_request != ALL) && (c->allow_request != request)) + { + syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname); + return -1; + } + + if(request_handlers[request](c)) /* Something went wrong. Probably scriptkiddies. Terminate. */ { syslog(LOG_ERR, _("Error while processing %s from %s (%s)"), - request_name[request], cl->name, cl->hostname); + request_name[request], c->name, c->hostname); return -1; } } else { syslog(LOG_ERR, _("Bogus data received from %s (%s)"), - cl->name, cl->hostname); + c->name, c->hostname); return -1; } +cp + return 0; } -/* Connection protocol: - - Client Server - send_id(u) - send_challenge(R) - send_chal_reply(H) - send_id(u) - send_challenge(R) - send_chal_reply(H) - --------------------------------------- - Any negotations about the meta protocol - encryption go here(u). - --------------------------------------- - send_ack(u) - send_ack(u) - --------------------------------------- - Other requests(E)... - - (u) Unencrypted, - (R) RSA, - (H) SHA1, - (E) Encrypted with symmetric cipher. - - Part of the challenge is directly used to set the symmetric cipher key and the initial vector. - Since a man-in-the-middle cannot decrypt the RSA challenges, this means that he cannot get or - forge the key for the symmetric cipher. -*/ +/* The authentication protocol is described in detail in doc/SECURITY2, + the rest will be described in doc/PROTOCOL. */ -int send_id(conn_list_t *cl) +int send_id(connection_t *c) { cp - cl->allow_request = CHALLENGE; -cp - return send_request(cl, "%d %s %d %lx %hd", ID, myself->name, myself->protocol_version, myself->options, myself->port); + return send_request(c, "%d %s %d", ID, myself->connection->name, myself->connection->protocol_version); } -int id_h(conn_list_t *cl) +int id_h(connection_t *c) { - conn_list_t *old; + char name[MAX_STRING_SIZE]; +int bla; cp - if(sscanf(cl->buffer, "%*d %as %d %lx %hd", &cl->name, &cl->protocol_version, &cl->options, &cl->port) != 4) + if(sscanf(c->buffer, "%*d "MAX_STRING" %d", name, &c->protocol_version) != 2) { - syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ID", c->name, c->hostname); return -1; } + /* Check if identity is a valid name */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ID", c->name, c->hostname, "invalid name"); + return -1; + } + + /* If we set c->name in advance, make sure we are connected to the right host */ + + if(c->name) + { + if(strcmp(c->name, name)) + { + syslog(LOG_ERR, _("Peer %s is %s instead of %s"), c->hostname, name, c->name); + return -1; + } + } + else + c->name = xstrdup(name); + /* Check if version matches */ - if(cl->protocol_version != myself->protocol_version) + if(c->protocol_version != myself->connection->protocol_version) { syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"), - cl->name, cl->hostname, cl->protocol_version); + c->name, c->hostname, c->protocol_version); return -1; } + + if(bypass_security) + { + if(!c->config_tree) + init_configuration(&c->config_tree); + c->allow_request = ACK; + return send_ack(c); + } - /* Check if identity is a valid name */ + if(!c->config_tree) + { + init_configuration(&c->config_tree); + + if((bla = read_connection_config(c))) + { + syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname, c->name); + return -1; + } + } + + if(read_rsa_public_key(c)) + { + return -1; + } + + c->allow_request = METAKEY; +cp + return send_metakey(c); +} + +int send_metakey(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len, x; +cp + len = RSA_size(c->rsa_key); - if(check_id(cl->name)) + /* Allocate buffers for the meta key */ + + if(!c->outkey) + c->outkey = xmalloc(len); + + if(!c->outctx) + c->outctx = xmalloc(sizeof(*c->outctx)); +cp + /* Copy random data to the buffer */ + + RAND_bytes(c->outkey, len); + + /* The message we send must be smaller than the modulus of the RSA key. + By definition, for a key of k bits, the following formula holds: + + 2^(k-1) <= modulus < 2^(k) + + Where ^ means "to the power of", not "xor". + This means that to be sure, we must choose our message < 2^(k-1). + This can be done by setting the most significant bit to zero. + */ + + c->outkey[0] &= 0x7F; + + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(c->outkey, buffer, len); + buffer[len*2] = '\0'; + syslog(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), buffer); + } + + /* Encrypt the random data + + We do not use one of the PKCS padding schemes here. + This is allowed, because we encrypt a totally random string + with a length equal to that of the modulus of the RSA key. + */ + + if(RSA_public_encrypt(len, c->outkey, buffer, c->rsa_key, RSA_NO_PADDING) != len) { - syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname); + syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname); return -1; } +cp + /* Convert the encrypted random data to a hexadecimal formatted string */ + + bin2hex(buffer, buffer, len); + buffer[len*2] = '\0'; + + /* Send the meta key */ + + x = send_request(c, "%d %s", METAKEY, buffer); + + /* Further outgoing requests are encrypted with the key we just generated */ + + EVP_EncryptInit(c->outctx, EVP_bf_cfb(), + c->outkey + len - EVP_bf_cfb()->key_len, + c->outkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + + c->status.encryptout = 1; +cp + return x; +} + +int metakey_h(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING, buffer) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name, c->hostname); + return -1; + } +cp + len = RSA_size(myself->connection->rsa_key); - /* Load information about peer */ + /* Check if the length of the meta key is all right */ - if(read_host_config(cl)) + if(strlen(buffer) != len*2) { - syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name); + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength"); return -1; } + /* Allocate buffers for the meta key */ +cp + if(!c->inkey) + c->inkey = xmalloc(len); - /* First check if the host we connected to is already in our - connection list. If so, we are probably making a loop, which - is not desirable. - */ + if(!c->inctx) + c->inctx = xmalloc(sizeof(*c->inctx)); - if(cl->status.outgoing) + /* Convert the challenge from hexadecimal back to binary */ +cp + hex2bin(buffer,buffer,len); + + /* Decrypt the meta key */ +cp + if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */ { - if((old = lookup_id(cl->name))) - { - if(debug_lvl > DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), cl->name, cl->hostname); - cl->status.outgoing = 0; - old->status.outgoing = 1; - terminate_connection(cl); - return 0; - } + syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname); + return -1; + } + + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(c->inkey, buffer, len); + buffer[len*2] = '\0'; + syslog(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer); } + + /* All incoming requests will now be encrypted. */ +cp + EVP_DecryptInit(c->inctx, EVP_bf_cfb(), + c->inkey + len - EVP_bf_cfb()->key_len, + c->inkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + + c->status.decryptin = 1; + + c->allow_request = CHALLENGE; cp - return send_challenge(cl); + return send_challenge(c); } -int send_challenge(conn_list_t *cl) +int send_challenge(connection_t *c) { - char buffer[CHAL_LENGTH*2+1]; + char buffer[MAX_STRING_SIZE]; + int len, x; cp + /* CHECKME: what is most reasonable value for len? */ + + len = RSA_size(c->rsa_key); + /* Allocate buffers for the challenge */ - if(!cl->hischallenge) - cl->hischallenge = xmalloc(CHAL_LENGTH); + if(!c->hischallenge) + c->hischallenge = xmalloc(len); cp /* Copy random data to the buffer */ - RAND_bytes(cl->hischallenge, CHAL_LENGTH); + RAND_bytes(c->hischallenge, len); + cp - /* Convert the random data to a hexadecimal formatted string */ + /* Convert to hex */ - bin2hex(cl->hischallenge, buffer, CHAL_LENGTH); - buffer[CHAL_LENGTH*2] = '\0'; + bin2hex(c->hischallenge, buffer, len); + buffer[len*2] = '\0'; +cp /* Send the challenge */ - cl->allow_request = CHAL_REPLY; + x = send_request(c, "%d %s", CHALLENGE, buffer); cp - return send_request(cl, "%d %s", CHALLENGE, buffer); + return x; } -int challenge_h(conn_list_t *cl) +int challenge_h(connection_t *c) { - char *buffer; + char buffer[MAX_STRING_SIZE]; + int len; cp - if(sscanf(cl->buffer, "%*d %as", &buffer) != 1) + if(sscanf(c->buffer, "%*d "MAX_STRING, buffer) != 1) { - syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name, c->hostname); return -1; } + len = RSA_size(myself->connection->rsa_key); + /* Check if the length of the challenge is all right */ - if(strlen(buffer) != CHAL_LENGTH*2) + if(strlen(buffer) != len*2) { - syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname); - free(buffer); + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong challenge length"); return -1; } /* Allocate buffers for the challenge */ - if(!cl->mychallenge) - cl->mychallenge = xmalloc(CHAL_LENGTH); + if(!c->mychallenge) + c->mychallenge = xmalloc(len); /* Convert the challenge from hexadecimal back to binary */ - hex2bin(buffer,cl->mychallenge,CHAL_LENGTH); - free(buffer); - + hex2bin(buffer,c->mychallenge,len); + + c->allow_request = CHAL_REPLY; + /* Rest is done by send_chal_reply() */ cp - return send_chal_reply(cl); + return send_chal_reply(c); } -int send_chal_reply(conn_list_t *cl) +int send_chal_reply(connection_t *c) { char hash[SHA_DIGEST_LENGTH*2+1]; cp - if(!cl->mychallenge) - { - syslog(LOG_ERR, _("Trying to send CHAL_REPLY to %s (%s) without a valid CHALLENGE"), cl->name, cl->hostname); - return -1; - } - /* Calculate the hash from the challenge we received */ - SHA1(cl->mychallenge, CHAL_LENGTH, hash); + SHA1(c->mychallenge, RSA_size(myself->connection->rsa_key), hash); /* Convert the hash to a hexadecimal formatted string */ @@ -297,24 +459,18 @@ cp /* Send the reply */ - if(cl->status.outgoing) - cl->allow_request = ID; - else - cl->allow_request = ACK; - cp - return send_request(cl, "%d %s", CHAL_REPLY, hash); + return send_request(c, "%d %s", CHAL_REPLY, hash); } -int chal_reply_h(conn_list_t *cl) +int chal_reply_h(connection_t *c) { - char *hishash; + char hishash[MAX_STRING_SIZE]; char myhash[SHA_DIGEST_LENGTH]; cp - if(sscanf(cl->buffer, "%*d %as", &hishash) != 1) + if(sscanf(c->buffer, "%*d "MAX_STRING, hishash) != 1) { - syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname); - free(hishash); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name, c->hostname); return -1; } @@ -322,8 +478,7 @@ cp if(strlen(hishash) != SHA_DIGEST_LENGTH*2) { - syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname); - free(hishash); + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply length")); return -1; } @@ -333,104 +488,222 @@ cp /* Calculate the hash from the challenge we sent */ - SHA1(cl->hischallenge, CHAL_LENGTH, myhash); + SHA1(c->hischallenge, RSA_size(c->rsa_key), myhash); /* Verify the incoming hash with the calculated hash */ if(memcmp(hishash, myhash, SHA_DIGEST_LENGTH)) { - syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname); - free(hishash); + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply")); + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(myhash, hishash, SHA_DIGEST_LENGTH); + hishash[SHA_DIGEST_LENGTH*2] = '\0'; + syslog(LOG_DEBUG, _("Expected challenge reply: %s"), hishash); + } return -1; } - free(hishash); - /* Identity has now been positively verified. - If we are accepting this new connection, then send our identity, - if we are making this connecting, acknowledge. + Send an acknowledgement with the rest of the information needed. */ + + c->allow_request = ACK; cp - if(cl->status.outgoing) - return send_ack(cl); - else - return send_id(cl); + return send_ack(c); } -int send_ack(conn_list_t *cl) +int send_ack(connection_t *c) { + /* ACK message contains rest of the information the other end needs + to create node_t and edge_t structures. */ + + struct timeval now; + + /* Estimate weight */ + + gettimeofday(&now, NULL); + c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000; cp - cl->allow_request = ACK; -cp - return send_request(cl, "%d", ACK); + return send_request(c, "%d %hd %d", ACK, myself->port, c->estimated_weight); } -int ack_h(conn_list_t *cl) +int ack_h(connection_t *c) { - conn_list_t *old; + int weight; + node_t *n; + subnet_t *s; + edge_t *e; + connection_t *other; + avl_node_t *node, *node2; cp - /* Okay, before we active the connection, we check if there is another entry - in the connection list with the same name. If so, it presumably is an - old connection that has timed out but we don't know it yet. - */ + if(sscanf(c->buffer, "%*d %hd %d", &port, &weight) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name, c->hostname); + return -1; + } + + /* Check if we already have a node_t for him */ - while((old = lookup_id(cl->name))) + n = lookup_node(c->name); + + if(!n) { - if(debug_lvl > DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"), - cl->name, old->hostname, cl->hostname); - old->status.active = 0; - terminate_connection(old); + n = new_node(); + n->name = xstrdup(c->name); + n->address = c->address; + n->hostname = xstrdup(c->hostname); + n->port = port; + + /* FIXME: Also check if no other tinc daemon uses the same IP and port for UDP traffic */ + + node_add(n); } + else + { + if(n->connection) + { + /* Oh dear, we already have a connection to this node. */ + syslog(LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"), n->name, n->hostname); + terminate_connection(n->connection, 0); + } + + /* FIXME: check if information in existing node matches that of the other end of this connection */ + } + + n->connection = c; + c->node = n; + + /* Check some options + + if((cfg = get_config_val(c->config, config_indirectdata))) + { + if(cfg->data.val == stupid_true) + c->options |= OPTION_INDIRECT; + } + + if((cfg = get_config_val(c->config, config_tcponly))) + { + if(cfg->data.val == stupid_true) + c->options |= OPTION_TCPONLY; + } + + if((myself->options | c->options) & OPTION_INDIRECT) + c->via = myself; + else + c->via = c; + + */ + + /* Create an edge_t for this connection */ + + c->edge = new_edge(); + + c->edge->from = myself; + c->edge->to = n; + c->edge->weight = (weight + c->estimated_weight) / 2; + c->edge->connection = c; + + edge_add(c->edge); /* Activate this connection */ - cl->allow_request = ALL; - cl->status.active = 1; + c->allow_request = ALL; + c->status.active = 1; + c->node->cipher = EVP_bf_cbc(); + c->node->keylength = c->node->cipher->key_len + c->node->cipher->iv_len; - if(debug_lvl > DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname); + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), c->name, c->hostname); - /* Exchange information about other tinc daemons */ +cp + /* Send him our subnets */ + + for(node = myself->subnet_tree->head; node; node = node->next) + { + s = (subnet_t *)node->data; + send_add_subnet(c, s); + } -/* FIXME: reprogram this. - notify_others(cl, NULL, send_add_host); - notify_one(cl); -*/ - upstreamindex = 0; + /* And send him all known nodes and their subnets */ + + for(node = node_tree->head; node; node = node->next) + { + n = (node_t *)node->data; + + if(n == c->node || n == myself) + continue; + + send_add_node(c, n); + + for(node2 = c->node->subnet_tree->head; node2; node2 = node2->next) + { + s = (subnet_t *)node2->data; + send_add_subnet(c, s); + } + } + + /* Send all known edges */ + + for(node = edge_tree->head; node; node = node->next) + { + e = (edge_t *)node->data; + + if(e == c->edge) + continue; + + send_add_edge(c, e); + } + + /* Notify others of this connection */ + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + + if(other->status.active && other != c) + { + send_add_node(other, c->node); + send_add_edge(other, c->edge); + } + } + + /* Run MST and SSSP algorithms */ + + mst_kruskal(); + sssp_bfs(0); cp - if(cl->status.outgoing) - return 0; - else - return send_ack(cl); + return 0; } + + /* Address and subnet information exchange */ -int send_add_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet) +int send_add_subnet(connection_t *c, subnet_t *subnet) { int x; char *netstr; cp - x = send_request(cl, "%d %s %s", ADD_SUBNET, - other->name, netstr = net2str(subnet)); + x = send_request(c, "%d %s %s", ADD_SUBNET, + subnet->owner->name, netstr = net2str(subnet)); free(netstr); cp return x; } -int add_subnet_h(conn_list_t *cl) +int add_subnet_h(connection_t *c) { - char *subnetstr; - char *name; - conn_list_t *owner; - subnet_t *subnet, *old; + char subnetstr[MAX_STRING_SIZE]; + char name[MAX_STRING_SIZE]; + node_t *owner; + connection_t *other; + subnet_t *s; + avl_node_t *node; cp - if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3) + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2) { - syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s)"), cl->name, cl->hostname); - free(name); free(subnetstr); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name, c->hostname); return -1; } @@ -438,67 +711,76 @@ cp if(check_id(name)) { - syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname); - free(name); free(subnetstr); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid name")); return -1; } /* Check if subnet string is valid */ - if(!(subnet = str2net(subnetstr))) + if(!(s = str2net(subnetstr))) { - syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname); - free(name); free(subnetstr); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid subnet string")); return -1; } - free(subnetstr); - - /* Check if somebody tries to add a subnet of ourself */ + /* Check if the owner of the new subnet is in the connection list */ - if(!strcmp(name, myself->name)) + owner = lookup_node(name); + + if(!owner) { - syslog(LOG_ERR, _("Warning: got ADD_SUBNET from %s (%s) for ourself, restarting"), - cl->name, cl->hostname); - free(name); - sighup = 1; - return 0; + syslog(LOG_ERR, _("Got ADD_SUBNET from %s (%s) for %s which is not in our connection list"), + c->name, c->hostname, name); + return -1; } - /* Check if the owner of the new subnet is in the connection list */ - - if(!(owner = lookup_id(name))) + /* Check if we already know this subnet */ + + if(lookup_subnet(owner, s)) { - syslog(LOG_ERR, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"), - name, cl->name, cl->hostname); - free(name); - return -1; + free_subnet(s); + return 0; } /* If everything is correct, add the subnet to the list of the owner */ - subnet_add(owner, subnet); + subnet_add(owner, s); + + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_add_subnet(other, s); + } cp return 0; } -int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet) +int send_del_subnet(connection_t *c, subnet_t *s) { + int x; + char *netstr; cp - return send_request(cl, "%d %s %s", DEL_SUBNET, other->name, net2str(subnet)); + x = send_request(c, "%d %s %s", DEL_SUBNET, s->owner->name, netstr = net2str(s)); + free(netstr); +cp + return x; } -int del_subnet_h(conn_list_t *cl) +int del_subnet_h(connection_t *c) { - char *subnetstr; - char *name; - conn_list_t *owner; - subnet_t *subnet, *old; + char subnetstr[MAX_STRING_SIZE]; + char name[MAX_STRING_SIZE]; + node_t *owner; + connection_t *other; + subnet_t *s, *find; + avl_node_t *node; cp - if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3) + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 3) { - syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s)"), cl->name, cl->hostname); - free(name); free(subnetstr); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name, c->hostname); return -1; } @@ -506,540 +788,757 @@ cp if(check_id(name)) { - syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname); - free(name); free(subnetstr); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid name")); return -1; } - /* Check if subnet string is valid */ + /* Check if the owner of the new subnet is in the connection list */ - if(!(subnet = str2net(subnetstr))) + if(!(owner = lookup_node(name))) { - syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname); - free(name); free(subnetstr); + syslog(LOG_ERR, _("Got %s from %s (%s) for %s which is not in our connection list"), + "DEL_SUBNET", c->name, c->hostname, name); return -1; } - free(subnetstr); - - /* Check if somebody tries to add a subnet of ourself */ + /* Check if subnet string is valid */ - if(!strcmp(name, myself->name)) + if(!(s = str2net(subnetstr))) { - syslog(LOG_ERR, _("Warning: got DEL_SUBNET from %s (%s) for ourself, restarting"), - cl->name, cl->hostname); - free(name); - sighup = 1; - return 0; + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid subnet string")); + return -1; } - /* Check if the owner of the new subnet is in the connection list */ + /* If everything is correct, delete the subnet from the list of the owner */ - if(!(owner = lookup_id(name))) + find = lookup_subnet(owner, s); + + free_subnet(s); + + if(!find) { - syslog(LOG_ERR, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"), - name, cl->name, cl->hostname); - free(name); + syslog(LOG_ERR, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"), + "DEL_SUBNET", c->name, c->hostname, name); return -1; } + + subnet_del(owner, find); - /* If everything is correct, delete the subnet from the list of the owner */ - - subnet_del(subnet); + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_subnet(other, s); + } cp return 0; } /* New and closed connections notification */ -int send_add_host(conn_list_t *cl, conn_list_t *other) +int send_add_node(connection_t *c, node_t *n) { cp - return send_request(cl, "%d %s %s %lx:%d %lx", ADD_HOST, - myself->name, other->name, other->address, other->port, other->options); + return send_request(c, "%d %s %lx:%d", ADD_NODE, + n->name, n->address, n->port); } -int add_host_h(conn_list_t *cl) +int add_node_h(connection_t *c) { - char *sender; - conn_list_t *old, *new, *hisuplink; + connection_t *other; + node_t *n; + char name[MAX_STRING_SIZE]; + ipv4_t address; + port_t port; + avl_node_t *node; cp - new = new_conn_list(); - - if(sscanf(cl->buffer, "%*d %as %as %lx:%d %lx", &sender, &new->name, &new->address, &new->port, &new->options) != 5) + if(sscanf(c->buffer, "%*d "MAX_STRING" %lx:%hd", name, &address, &port) != 3) { - syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_NODE", c->name, c->hostname); return -1; } /* Check if identity is a valid name */ - if(check_id(new->name) || check_id(sender)) + if(check_id(name)) { - syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname); - free(sender); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_NODE", c->name, c->hostname, _("invalid name")); return -1; } - /* Check if somebody tries to add ourself */ - - if(!strcmp(new->name, myself->name)) + /* Check if node already exists */ + + n = lookup_node(name); + + if(n) { - syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), cl->name, cl->hostname); - sighup = 1; - free(sender); + /* Check if it matches */ + + if(n->address != address || n->port != port) + syslog(LOG_DEBUG, _("Got %s from %s (%s) for %s which does not match existing entry"), "ADD_NODE", c->name, c->hostname, n->name); + return 0; } + else + { + n = new_node(); + n->name = xstrdup(name); + n->address = address; + n->port = port; + node_add(n); + } - /* We got an ADD_HOST from ourself!? */ + /* Tell the rest about the new node */ - if(!strcmp(sender, myself->name)) + for(node = connection_tree->head; node; node = node->next) { - syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) from ourself, restarting"), cl->name, cl->hostname); - sighup = 1; - free(sender); - return 0; + other = (connection_t *)node->data; + if(other->status.active && other !=c) + send_add_node(other, n); } - /* Lookup his uplink */ +cp + return 0; +} + +int send_del_node(connection_t *c, node_t *n) +{ +cp + return send_request(c, "%d %s %lx:%d", DEL_NODE, + n->name, n->address, n->port); +} - if(!(new->hisuplink = lookup_id(sender))) +int del_node_h(connection_t *c) +{ + node_t *n; + char name[MAX_STRING_SIZE]; + ipv4_t address; + port_t port; + connection_t *other; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" %lx:%hd", name, &address, &port) != 3) { - syslog(LOG_ERR, _("Got ADD_HOST from %s (%s) with origin %s which is not in our connection list"), - sender, cl->name, cl->hostname); - free(sender); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_NODE", + c->name, c->hostname); return -1; } - - free(sender); - /* Fill in more of the new conn_list structure */ + /* Check if identity is a valid name */ - new->hostname = hostlookup(htonl(new->address)); + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_NODE", c->name, c->hostname, _("invalid name")); + return -1; + } - /* Check if the new host already exists in the connnection list */ + /* Check if somebody tries to delete ourself */ - if((old = lookup_id(new->name))) + if(!strcmp(name, myself->name)) { - if((new->address == old->address) && (new->port == old->port)) - { - if(debug_lvl > DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"), - old->name, old->hostname, new->name, new->hostname); - return 0; - } - else - { - if(debug_lvl > DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"), - old->name, old->hostname); - old->status.active = 0; - terminate_connection(old); - } + syslog(LOG_ERR, _("Got %s from %s (%s) for ourself!"), "DEL_NODE", + c->name, c->hostname); + return -1; } - /* Fill in rest of conn_list structure */ + /* Check if the deleted host exists */ - new->myuplink = cl; - new->status.active = 1; + n = lookup_node(name); - /* Hook it up into the conn_list */ + if(!n) + { + syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which does not exist"), "DEL_NODE", c->name, c->hostname, n->name); + return 0; + } + + /* Check if the rest matches */ + + if(address != n->address || port != n->port) + { + syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which does not match existing entry"), "DEL_NODE", c->name, c->hostname, n->name); + } - conn_list_add(conn_list, new); + /* Tell the rest about the deleted node */ - /* Tell the rest about the new host */ -/* FIXME: reprogram this. - notify_others(new, cl, send_add_host); -*/ + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_node(other, n); + } + + /* Delete the node */ + + node_del(n); + + mst_kruskal(); + sssp_bfs(0); cp return 0; } -int send_del_host(conn_list_t *cl, conn_list_t *other) +/* Edges */ + +int send_add_edge(connection_t *c, edge_t *e) { cp - return send_request(cl, "%d %s %s %lx:%d %lx", DEL_HOST, - myself->name, other->name, other->address, other->port, other->options); + return send_request(c, "%d %s %s %lx %d", ADD_EDGE, + e->from->name, e->to->name, e->options, e->weight); } -int del_host_h(conn_list_t *cl) +int add_edge_h(connection_t *c) { - char *name; - char *sender; - ip_t address; - port_t port; - int options; - conn_list_t *old, *hisuplink; - + connection_t *other; + edge_t *e; + node_t *from, *to; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + long int options; + int weight; + avl_node_t *node; cp - if(sscanf(cl->buffer, "%*d %as %as %lx:%d %lx", &sender, &name, &address, &port, &options) != 5) + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" %lx %d", from_name, to_name, &options, &weight) != 4) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_EDGE", c->name, c->hostname); + return -1; + } + + /* Check if names are valid */ + + if(check_id(from_name)) { - syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"), - cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); return -1; } - /* Check if identity is a valid name */ + if(check_id(to_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Lookup nodes */ - if(check_id(name) || check_id(sender)) + from = lookup_node(from_name); + + if(!from) { - syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname); - free(name); free(sender); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("unknown node")); return -1; } - /* Check if somebody tries to delete ourself */ + to = lookup_node(to_name); + + if(!to) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("unknown node")); + return -1; + } - if(!strcmp(name, myself->name)) + /* Check if edge already exists */ + + e = lookup_edge(from, to); + + if(e) { - syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"), - cl->name, cl->hostname); - free(name); free(sender); - sighup = 1; + if(e->weight != weight || e->options != options) + { + syslog(LOG_ERR, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + return -1; + } + return 0; } + else + { + e = new_edge(); + e->from = from; + e->to = to; + e->options = options; + e->weight = weight; + edge_add(e); + } - /* We got an ADD_HOST from ourself!? */ + /* Tell the rest about the new edge */ - if(!strcmp(sender, myself->name)) + for(node = connection_tree->head; node; node = node->next) { - syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) from ourself, restarting"), cl->name, cl->hostname); - sighup = 1; - free(name); free(sender); - return 0; + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_add_edge(other, e); } - /* Lookup his uplink */ + /* Run MST before or after we tell the rest? */ + + mst_kruskal(); + sssp_bfs(0); +cp + return 0; +} - if(!(hisuplink = lookup_id(sender))) +int send_del_edge(connection_t *c, edge_t *e) +{ +cp + return send_request(c, "%d %s %s %lx %d", DEL_EDGE, + e->from->name, e->to->name, e->options, e->weight); +} + +int del_edge_h(connection_t *c) +{ + edge_t *e; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + node_t *from, *to; + long int options; + int weight; + connection_t *other; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" %lx %d", from_name, to_name, &options, &weight) != 4) { - syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) with origin %s which is not in our connection list"), - cl->name, cl->hostname, sender); - free(name); free(sender); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_EDGE", + c->name, c->hostname); return -1; } - - free(sender); - /* Check if the new host already exists in the connnection list */ + /* Check if names are valid */ + + if(check_id(from_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } - if(!(old = lookup_id(name))) + if(check_id(to_name)) { - syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) for %s which is not in our connection list"), - name, cl->name, cl->hostname); - free(name); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); return -1; } + + /* Lookup nodes */ + + from = lookup_node(from_name); - /* Check if the rest matches */ + if(!from) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown node")); + return 0; + } + + to = lookup_node(to_name); - if(address!=old->address || port!=old->port || options!=old->options || hisuplink!=old->hisuplink || cl!=old->myuplink) + if(!to) { - syslog(LOG_WARNING, _("Got DEL_HOST from %s (%s) for %s which doesn't match"), cl->name, cl->hostname, old->name); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown node")); return 0; } - /* Ok, since EVERYTHING seems to check out all right, delete it */ + /* Check if edge exists */ + + e = lookup_edge(from, to); + + if(e) + { + if(e->weight != weight || e->options != options) + { + syslog(LOG_ERR, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + return -1; + } + } + else + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown edge")); + return 0; + } - old->status.termreq = 1; - old->status.active = 0; + /* Tell the rest about the deleted edge */ - terminate_connection(old); + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_edge(other, e); + } + + /* Delete the edge */ + + edge_del(e); + + /* Run MST before or after we tell the rest? */ + + mst_kruskal(); + sssp_bfs(1); cp return 0; } + /* Status and error notification routines */ -int send_status(conn_list_t *cl, int statusno, char *statusstring) +int send_status(connection_t *c, int statusno, char *statusstring) { cp if(!statusstring) statusstring = status_text[statusno]; cp - return send_request(cl, "%d %d %s", STATUS, statusno, statusstring); + return send_request(c, "%d %d %s", STATUS, statusno, statusstring); } -int status_h(conn_list_t *cl) +int status_h(connection_t *c) { int statusno; - char *statusstring; + char statusstring[MAX_STRING_SIZE]; cp - if(sscanf(cl->buffer, "%*d %d %as", &statusno, &statusstring) != 2) + if(sscanf(c->buffer, "%*d %d "MAX_STRING, &statusno, statusstring) != 2) { - syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"), - cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "STATUS", + c->name, c->hostname); return -1; } - if(debug_lvl > DEBUG_STATUS) + if(debug_lvl >= DEBUG_STATUS) { syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"), - cl->name, cl->hostname, status_text[statusno], statusstring); + c->name, c->hostname, status_text[statusno], statusstring); } cp - free(statusstring); return 0; } -int send_error(conn_list_t *cl, int errno, char *errstring) +int send_error(connection_t *c, int err, char *errstring) { cp if(!errstring) - errstring = strerror(errno); - return send_request(cl, "%d %d %s", ERROR, errno, errstring); + errstring = strerror(err); + return send_request(c, "%d %d %s", ERROR, err, errstring); } -int error_h(conn_list_t *cl) +int error_h(connection_t *c) { - int errno; - char *errorstring; + int err; + char errorstring[MAX_STRING_SIZE]; cp - if(sscanf(cl->buffer, "%*d %d %as", &errno, &errorstring) != 2) + if(sscanf(c->buffer, "%*d %d "MAX_STRING, &err, errorstring) != 2) { - syslog(LOG_ERR, _("Got bad ERROR from %s (%s)"), - cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ERROR", + c->name, c->hostname); return -1; } - if(debug_lvl > DEBUG_ERROR) + if(debug_lvl >= DEBUG_ERROR) { syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"), - cl->name, cl->hostname, strerror(errno), errorstring); + c->name, c->hostname, strerror(err), errorstring); } - free(errorstring); - cl->status.termreq = 1; - terminate_connection(cl); + terminate_connection(c, c->status.active); cp return 0; } -int send_termreq(conn_list_t *cl) +int send_termreq(connection_t *c) { cp - return send_request(cl, "%d", TERMREQ); + return send_request(c, "%d", TERMREQ); } -int termreq_h(conn_list_t *cl) +int termreq_h(connection_t *c) { cp - cl->status.termreq = 1; - terminate_connection(cl); + terminate_connection(c, c->status.active); cp return 0; } -/* Keepalive routines - FIXME: needs a closer look */ - -int send_ping(conn_list_t *cl) +int send_ping(connection_t *c) { - cl->status.pinged = 1; + char salt[SALTLEN*2+1]; cp - return send_request(cl, "%d", PING); + c->status.pinged = 1; + c->last_ping_time = time(NULL); + RAND_pseudo_bytes(salt, SALTLEN); + bin2hex(salt, salt, SALTLEN); + salt[SALTLEN*2] = '\0'; +cp + return send_request(c, "%d %s", PING, salt); } -int ping_h(conn_list_t *cl) +int ping_h(connection_t *c) { cp - return send_pong(cl); + return send_pong(c); } -int send_pong(conn_list_t *cl) +int send_pong(connection_t *c) { + char salt[SALTLEN*2+1]; +cp + RAND_pseudo_bytes(salt, SALTLEN); + bin2hex(salt, salt, SALTLEN); + salt[SALTLEN*2] = '\0'; cp - return send_request(cl, "%d", PONG); + return send_request(c, "%d %s", PONG, salt); } -int pong_h(conn_list_t *cl) +int pong_h(connection_t *c) { cp - cl->status.got_pong = 1; + c->status.pinged = 0; cp return 0; } /* Key exchange */ -int send_key_changed(conn_list_t *from, conn_list_t *cl) +int send_key_changed(connection_t *c, node_t *n) { - conn_list_t *p; + connection_t *other; + avl_node_t *node; cp - for(p = conn_list; p != NULL; p = p->next) + /* Only send this message if some other daemon requested our key previously. + This reduces unnecessary key_changed broadcasts. + */ + + if(n == myself && !mykeyused) + return 0; + + for(node = connection_tree->head; node; node = node->next) { - if(p!=cl && p->status.meta && p->status.active) - send_request(p, "%d %s", KEY_CHANGED, - from->name); + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_request(other, "%d %s", KEY_CHANGED, n->name); } cp return 0; } -int key_changed_h(conn_list_t *cl) +int key_changed_h(connection_t *c) { - char *from_id; - conn_list_t *from; + char name[MAX_STRING_SIZE]; + node_t *n; cp - if(sscanf(cl->buffer, "%*d %as", &from_id) != 1) + if(sscanf(c->buffer, "%*d "MAX_STRING, name) != 1) { - syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"), - cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED", + c->name, c->hostname); return -1; } - if(!(from = lookup_id(from_id))) + n = lookup_node(name); + + if(!n) { - syslog(LOG_ERR, _("Got KEY_CHANGED from %s (%s) origin %s which does not exist in our connection list"), - cl->name, cl->hostname, from_id); - free(from_id); + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED", + c->name, c->hostname, name); return -1; } - free(from_id); + n->status.validkey = 0; + n->status.waitingforkey = 0; - from->status.validkey = 0; - from->status.waitingforkey = 0; - - send_key_changed(from, cl); + send_key_changed(c, n); cp return 0; } -int send_req_key(conn_list_t *from, conn_list_t *to) +int send_req_key(connection_t *c, node_t *from, node_t *to) { cp - return send_request(to->nexthop, "%d %s %s", REQ_KEY, + return send_request(c, "%d %s %s", REQ_KEY, from->name, to->name); } -int req_key_h(conn_list_t *cl) +int req_key_h(connection_t *c) { - char *from_id, *to_id; - conn_list_t *from, *to; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + node_t *from, *to; + char key[MAX_STRING_SIZE]; cp - if(sscanf(cl->buffer, "%*d %as %as", &from_id, &to_id) != 2) + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) { - syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"), - cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY", + c->name, c->hostname); return -1; } - if(!(from = lookup_id(from_id))) + from = lookup_node(from_name); + + if(!from) { - syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) origin %s which does not exist in our connection list"), - cl->name, cl->hostname, from_id); - free(from_id); free(to_id); + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY", + c->name, c->hostname, from_name); + return -1; + } + + to = lookup_node(to_name); + + if(!to) + { + syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY", + c->name, c->hostname, to_name); return -1; } /* Check if this key request is for us */ - if(!strcmp(to_id, myself->name)) + if(to == myself) /* Yes, send our own key back */ { - send_ans_key(myself, from, myself->cipher_pktkey); + bin2hex(myself->key, key, myself->keylength); + key[myself->keylength * 2] = '\0'; + send_ans_key(c, myself, from, key); + mykeyused = 1; } else { - if(!(to = lookup_id(to_id))) + if(to->status.validkey) /* Proxy keys */ { - syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) destination %s which does not exist in our connection list"), - cl->name, cl->hostname, to_id); - free(from_id); free(to_id); - return -1; + bin2hex(to->key, key, to->keylength); + key[to->keylength * 2] = '\0'; + send_ans_key(c, to, from, key); } - send_req_key(from, to); + else + send_req_key(to->nexthop->connection, from, to); } - free(from_id); free(to_id); cp return 0; } -int send_ans_key(conn_list_t *from, conn_list_t *to, char *pktkey) +int send_ans_key(connection_t *c, node_t *from, node_t *to, char *key) { cp - return send_request(to->nexthop, "%d %s %s %s", ANS_KEY, - from->name, to->name, pktkey); + return send_request(c, "%d %s %s %s", ANS_KEY, + from->name, to->name, key); } -int ans_key_h(conn_list_t *cl) +int ans_key_h(connection_t *c) { - char *from_id, *to_id, *pktkey; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + char key[MAX_STRING_SIZE]; int keylength; - conn_list_t *from, *to; + node_t *from, *to; cp - if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &pktkey) != 3) + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING, from_name, to_name, key) != 3) { - syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"), - cl->name, cl->hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", + c->name, c->hostname); return -1; } - if(!(from = lookup_id(from_id))) + from = lookup_node(from_name); + + if(!from) { - syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) origin %s which does not exist in our connection list"), - cl->name, cl->hostname, from_id); - free(from_id); free(to_id); free(pktkey); + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY", + c->name, c->hostname, from_name); return -1; } - /* Check if this key request is for us */ + to = lookup_node(to_name); - if(!strcmp(to_id, myself->name)) + if(!to) { - /* It is for us, convert it to binary and set the key with it. */ + syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY", + c->name, c->hostname, to_name); + return -1; + } - keylength = strlen(pktkey); + /* Check correctness of packet key */ - if((keylength%2) || (keylength <= 0)) - { - syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"), - cl->name, cl->hostname, from->name); - free(from_id); free(to_id); free(pktkey); - return -1; - } - keylength /= 2; - hex2bin(pktkey, pktkey, keylength); - BF_set_key(cl->cipher_pktkey, keylength, pktkey); + keylength = strlen(key); + + if(keylength != from->keylength * 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s) origin %s: %s"), "ANS_KEY", + c->name, c->hostname, from->name, _("invalid key length")); + return -1; } - else + + /* Forward it if necessary */ + + if(to != myself) { - if(!(to = lookup_id(to_id))) - { - syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) destination %s which does not exist in our connection list"), - cl->name, cl->hostname, to_id); - free(from_id); free(to_id); free(pktkey); - return -1; - } - send_ans_key(from, to, pktkey); + send_ans_key(to->nexthop->connection, from, to, key); } - free(from_id); free(to_id); free(pktkey); + /* Update our copy of the origin's packet key */ + + if(from->key) + free(from->key); + + from->key = xstrdup(key); + keylength /= 2; + hex2bin(from->key, from->key, keylength); + from->key[keylength] = '\0'; + + from->status.validkey = 1; + from->status.waitingforkey = 0; + + flush_queue(from); +cp + return 0; +} + +int send_tcppacket(connection_t *c, vpn_packet_t *packet) +{ + int x; +cp + /* Evil hack. */ + + x = send_request(c, "%d %hd", PACKET, packet->len); + + if(x) + return x; +cp + return send_meta(c, packet->data, packet->len); +} + +int tcppacket_h(connection_t *c) +{ + short int len; +cp + if(sscanf(c->buffer, "%*d %hd", &len) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "PACKET", c->name, c->hostname); + return -1; + } + + /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */ + + c->tcplen = len; cp return 0; } /* Jumptable for the request handlers */ -int (*request_handlers[])(conn_list_t*) = { - id_h, challenge_h, chal_reply_h, ack_h, +int (*request_handlers[])(connection_t*) = { + id_h, metakey_h, challenge_h, chal_reply_h, ack_h, status_h, error_h, termreq_h, ping_h, pong_h, - add_host_h, del_host_h, + add_node_h, del_node_h, add_subnet_h, del_subnet_h, + add_edge_h, del_edge_h, key_changed_h, req_key_h, ans_key_h, + tcppacket_h, }; /* Request names */ char (*request_name[]) = { - "ID", "CHALLENGE", "CHAL_REPLY", "ACK", + "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK", "STATUS", "ERROR", "TERMREQ", "PING", "PONG", - "ADD_HOST", "DEL_HOST", + "ADD_NODE", "DEL_NODE", "ADD_SUBNET", "DEL_SUBNET", + "ADD_EDGE", "DEL_EDGE", "KEY_CHANGED", "REQ_KEY", "ANS_KEY", + "PACKET", }; /* Status strings */