X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=68ac1360c93bf5e17aa1a2d468609bd11ee27b49;hp=1460fbf14d5f9bee7cb0e1ec873d3f13607e9c22;hb=1c007c0627ad5e71b8218fcb086240970e955c87;hpb=1243156a5e03a666b36bc4400f1402243a85c9a7 diff --git a/src/protocol.c b/src/protocol.c index 1460fbf1..68ac1360 100644 --- a/src/protocol.c +++ b/src/protocol.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -36,24 +37,25 @@ int send_ack(conn_list_t *cl) { unsigned char tmp = ACK; - +cp if(debug_lvl > 2) syslog(LOG_DEBUG, "Send ACK to %s", cl->hostname); syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname); - if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %d:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_termreq(conn_list_t *cl) { termreq_t tmp; - +cp + memset(&tmp, 0, sizeof(tmp)); tmp.type = TERMREQ; tmp.vpn_ip = myself->vpn_ip; @@ -61,19 +63,20 @@ int send_termreq(conn_list_t *cl) syslog(LOG_DEBUG, "Send TERMREQ(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip), IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_timeout(conn_list_t *cl) { termreq_t tmp; - +cp + memset(&tmp, 0, sizeof(tmp)); tmp.type = PINGTIMEOUT; tmp.vpn_ip = myself->vpn_ip; @@ -81,19 +84,20 @@ int send_timeout(conn_list_t *cl) syslog(LOG_DEBUG, "Send TIMEOUT(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip), IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_del_host(conn_list_t *cl, conn_list_t *new_host) { del_host_t tmp; - +cp + memset(&tmp, 0, sizeof(tmp)); tmp.type = DEL_HOST; tmp.vpn_ip = new_host->vpn_ip; @@ -101,48 +105,49 @@ int send_del_host(conn_list_t *cl, conn_list_t *new_host) syslog(LOG_DEBUG, "Sending delete host %lx to " IP_ADDR_S, tmp.vpn_ip, IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, (unsigned char*)&tmp, sizeof(del_host_t), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_ping(conn_list_t *cl) { unsigned char tmp = PING; - +cp if(debug_lvl > 3) syslog(LOG_DEBUG, "pinging " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_pong(conn_list_t *cl) { unsigned char tmp = PONG; - - if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0) +cp + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_add_host(conn_list_t *cl, conn_list_t *new_host) { add_host_t tmp; - +cp + memset(&tmp, 0, sizeof(tmp)); tmp.type = ADD_HOST; tmp.real_ip = new_host->real_ip; tmp.vpn_ip = new_host->vpn_ip; @@ -154,19 +159,20 @@ int send_add_host(conn_list_t *cl, conn_list_t *new_host) tmp.vpn_ip, tmp.vpn_mask, tmp.real_ip, tmp.portnr, IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, (unsigned char*)&tmp, sizeof(add_host_t), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_key_changed(conn_list_t *cl, conn_list_t *src) { key_changed_t tmp; - +cp + memset(&tmp, 0, sizeof(tmp)); tmp.type = KEY_CHANGED; tmp.from = src->vpn_ip; @@ -174,28 +180,30 @@ int send_key_changed(conn_list_t *cl, conn_list_t *src) syslog(LOG_DEBUG, "Sending KEY_CHANGED (%lx) to " IP_ADDR_S, tmp.from, IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, (unsigned char*)&tmp, sizeof(key_changed_t), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } void send_key_changed2(void) { conn_list_t *p; - +cp for(p = conn_list; p != NULL; p = p->next) if(p->status.meta && p->protocol_version > PROT_3) send_key_changed(p, myself); +cp } int send_basic_info(conn_list_t *cl) { basic_info_t tmp; - +cp + memset(&tmp, 0, sizeof(tmp)); tmp.type = BASIC_INFO; tmp.protocol = PROT_CURRENT; @@ -208,19 +216,20 @@ int send_basic_info(conn_list_t *cl) tmp.protocol, tmp.portnr, IP_ADDR_V(tmp.vpn_ip), IP_ADDR_V(tmp.vpn_mask), IP_ADDR_V(cl->real_ip)); - if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0) + if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_passphrase(conn_list_t *cl) { passphrase_t tmp; - +cp + memset(&tmp, 0, sizeof(tmp)); tmp.type = PASSPHRASE; encrypt_passphrase(&tmp); @@ -228,20 +237,21 @@ int send_passphrase(conn_list_t *cl) syslog(LOG_DEBUG, "Send PASSPHRASE(%hd,...) to " IP_ADDR_S, tmp.len, IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, &tmp, tmp.len+3, 0)) < 0) + if((write(cl->meta_socket, &tmp, tmp.len+3)) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_public_key(conn_list_t *cl) { public_key_t *tmp; - - tmp = (public_key_t*)xmalloc(strlen(my_public_key_base36)+sizeof(public_key_t)); +cp + tmp = (public_key_t*)xmalloc(strlen(my_public_key_base36)+sizeof(*tmp)); + memset(tmp, 0, sizeof(*tmp)); tmp->type = PUBLIC_KEY; tmp->len = strlen(my_public_key_base36); strcpy(&tmp->key, my_public_key_base36); @@ -250,30 +260,31 @@ int send_public_key(conn_list_t *cl) syslog(LOG_DEBUG, "Send PUBLIC_KEY(%hd,%s) to " IP_ADDR_S, tmp->len, &tmp->key, IP_ADDR_V(cl->vpn_ip)); - if((send(cl->meta_socket, tmp, tmp->len+sizeof(public_key_t), 0)) < 0) + if((write(cl->meta_socket, tmp, tmp->len+sizeof(*tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } int send_calculate(conn_list_t *cl, char *k) { calculate_t *tmp; - - tmp = xmalloc(strlen(k)+sizeof(calculate_t)); +cp + tmp = xmalloc(strlen(k)+sizeof(*tmp)); + memset(tmp, 0, sizeof(*tmp)); tmp->type = CALCULATE; tmp->len = strlen(k); strcpy(&tmp->key, k); - if(send(cl->meta_socket, tmp, tmp->len+4, 0) < 0) + if((write(cl->meta_socket, tmp, tmp->len+sizeof(*tmp))) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } @@ -281,8 +292,9 @@ int send_key_request(ip_t to) { key_req_t *tmp; conn_list_t *fw; - - tmp = xmalloc(sizeof(key_req_t)); +cp + tmp = xmalloc(sizeof(*tmp)); + memset(tmp, 0, sizeof(*tmp)); tmp->type = REQ_KEY; tmp->to = to; tmp->from = myself->vpn_ip; @@ -299,13 +311,13 @@ int send_key_request(ip_t to) if(debug_lvl > 2) syslog(LOG_DEBUG, "Sending out request for public key to " IP_ADDR_S, IP_ADDR_V(fw->nexthop->vpn_ip)); - if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t), 0) < 0) + if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } fw->status.waitingforkey = 1; - +cp return 0; } @@ -313,8 +325,9 @@ int send_key_answer(conn_list_t *cl, ip_t to) { key_req_t *tmp; conn_list_t *fw; - - tmp = xmalloc(sizeof(key_req_t)+strlen(my_public_key_base36)); +cp + tmp = xmalloc(sizeof(*tmp)+strlen(my_public_key_base36)); + memset(tmp, 0, sizeof(*tmp)); tmp->type = ANS_KEY; tmp->to = to; tmp->from = myself->vpn_ip; @@ -323,15 +336,23 @@ int send_key_answer(conn_list_t *cl, ip_t to) strcpy(&tmp->key, my_public_key_base36); fw = lookup_conn(to); + + if(!fw) + { + syslog(LOG_ERR, "Attempting to send key answer to " IP_ADDR_S ", which does not exist?", + IP_ADDR_V(to)); + return -1; + } + if(debug_lvl > 2) syslog(LOG_DEBUG, "Sending public key to " IP_ADDR_S, IP_ADDR_V(fw->nexthop->vpn_ip)); - if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t)+tmp->len, 0) < 0) + if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)+tmp->len) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } @@ -344,11 +365,11 @@ int notify_others(conn_list_t *new, conn_list_t *source, int (*function)(conn_list_t*, conn_list_t*)) { conn_list_t *p; - +cp for(p = conn_list; p != NULL; p = p->next) if(p != new && p != source && p->status.meta && p->protocol_version > PROT_3) function(p, new); - +cp return 0; } @@ -359,11 +380,11 @@ int notify_others(conn_list_t *new, conn_list_t *source, int notify_one(conn_list_t *new) { conn_list_t *p; - +cp for(p = conn_list; p != NULL; p = p->next) if(p != new && p->protocol_version > PROT_3) send_add_host(new, p); - +cp return 0; } @@ -374,7 +395,7 @@ int notify_one(conn_list_t *new) int basic_info_h(conn_list_t *cl, unsigned char *d, int len) { basic_info_t *tmp = (basic_info_t*)d; - +cp cl->protocol_version = tmp->protocol; cl->port = tmp->portnr; cl->vpn_ip = tmp->vpn_ip; @@ -408,14 +429,14 @@ int basic_info_h(conn_list_t *cl, unsigned char *d, int len) } cl->status.active = 0; - +cp return 0; } int passphrase_h(conn_list_t *cl, unsigned char *d, int len) { passphrase_t *tmp = (passphrase_t*)d; - +cp cl->pp = xmalloc(tmp->len+3); memcpy(cl->pp, tmp, tmp->len+3); @@ -426,7 +447,7 @@ int passphrase_h(conn_list_t *cl, unsigned char *d, int len) send_passphrase(cl); else send_public_key(cl); - +cp return 0; } @@ -434,7 +455,7 @@ int public_key_h(conn_list_t *cl, unsigned char *d, int len) { char *g_n; public_key_t *tmp = (public_key_t*)d; - +cp if(debug_lvl > 2) syslog(LOG_DEBUG, "got PUBLIC_KEY(%hd,%s)", tmp->len, &tmp->key); @@ -459,54 +480,41 @@ int public_key_h(conn_list_t *cl, unsigned char *d, int len) cl->status.active = 1; notify_others(cl, NULL, send_add_host); notify_one(cl); - +cp return 0; } int ack_h(conn_list_t *cl, unsigned char *d, int len) { +cp if(debug_lvl > 2) syslog(LOG_DEBUG, "got ACK"); cl->status.active = 1; syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname); - - /* - Now I'm going to cheat. The meta protocol is actually - a stream of requests, that may come in in the same TCP - packet. This is the only place that it will happen, - though. - I may change it in the future, if it appears that this - is not retainable. - */ - if(len > 1) /* An ADD_HOST follows */ - { - if(request_handlers[d[1]] == NULL) - syslog(LOG_ERR, "Unknown request %d.", d[1]); - if(request_handlers[d[1]](cl, d, len - 1) < 0) - return -1; - } - +cp return 0; } int termreq_h(conn_list_t *cl, unsigned char *d, int len) { +cp syslog(LOG_NOTICE, IP_ADDR_S " wants to quit", IP_ADDR_V(cl->vpn_ip)); cl->status.termreq = 1; terminate_connection(cl); notify_others(cl, NULL, send_del_host); - +cp return 0; } int timeout_h(conn_list_t *cl, unsigned char *d, int len) { +cp syslog(LOG_NOTICE, IP_ADDR_S " says it's gotten a timeout from us", IP_ADDR_V(cl->vpn_ip)); cl->status.termreq = 1; terminate_connection(cl); - +cp return 0; } @@ -514,7 +522,7 @@ int del_host_h(conn_list_t *cl, unsigned char *d, int len) { del_host_t *tmp = (del_host_t*)d; conn_list_t *fw; - +cp if(debug_lvl > 2) syslog(LOG_DEBUG, "got DEL_HOST for " IP_ADDR_S, IP_ADDR_V(tmp->vpn_ip)); @@ -530,28 +538,30 @@ int del_host_h(conn_list_t *cl, unsigned char *d, int len) fw->status.termreq = 1; terminate_connection(fw); - +cp return 0; } int ping_h(conn_list_t *cl, unsigned char *d, int len) { +cp if(debug_lvl > 3) syslog(LOG_DEBUG, "responding to ping from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); cl->status.pinged = 0; cl->status.got_pong = 1; send_pong(cl); - +cp return 0; } int pong_h(conn_list_t *cl, unsigned char *d, int len) { +cp if(debug_lvl > 3) syslog(LOG_DEBUG, "ok, got pong from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); cl->status.got_pong = 1; - +cp return 0; } @@ -559,7 +569,7 @@ int add_host_h(conn_list_t *cl, unsigned char *d, int len) { add_host_t *tmp = (add_host_t*)d; conn_list_t *ncn, *fw; - +cp if(debug_lvl > 2) syslog(LOG_DEBUG, "Add host request from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); if(debug_lvl > 3) @@ -586,18 +596,7 @@ int add_host_h(conn_list_t *cl, unsigned char *d, int len) conn_list = ncn; ncn->status.active = 1; notify_others(ncn, cl, send_add_host); - - /* - again, i'm cheating here. see the comment in ack_h. - */ - if(len > sizeof(add_host_t)) /* Another ADD_HOST follows */ - { - if(request_handlers[d[sizeof(add_host_t)]] == NULL) - syslog(LOG_ERR, "Unknown request %d.", d[sizeof(add_host_t)]); - if(request_handlers[d[sizeof(add_host_t)]](cl, d, len - sizeof(add_host_t)) < 0) - return -1; - } - +cp return 0; } @@ -605,7 +604,7 @@ int req_key_h(conn_list_t *cl, unsigned char *d, int len) { key_req_t *tmp = (key_req_t*)d; conn_list_t *fw; - +cp if(debug_lvl > 2) syslog(LOG_DEBUG, "got REQ_KEY from " IP_ADDR_S " for " IP_ADDR_S, IP_ADDR_V(tmp->from), IP_ADDR_V(tmp->to)); @@ -617,25 +616,33 @@ int req_key_h(conn_list_t *cl, unsigned char *d, int len) } fw = lookup_conn(tmp->to); + + if(!fw) + { + syslog(LOG_ERR, "Attempting to forward key request to " IP_ADDR_S ", which does not exist?", + IP_ADDR_V(tmp->to)); + return -1; + } + if(debug_lvl > 3) syslog(LOG_DEBUG, "Forwarding request for public key to " IP_ADDR_S, IP_ADDR_V(fw->nexthop->vpn_ip)); - if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t), 0) < 0) + if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } void set_keys(conn_list_t *cl, key_req_t *k) { char *ek; - +cp if(!cl->public_key) { - cl->public_key = xmalloc(sizeof(enc_key_t)); + cl->public_key = xmalloc(sizeof(*cl->key)); cl->public_key->key = NULL; } if(cl->public_key->key) @@ -648,7 +655,7 @@ void set_keys(conn_list_t *cl, key_req_t *k) ek = make_shared_key(&(k->key)); if(!cl->key) { - cl->key = xmalloc(sizeof(enc_key_t)); + cl->key = xmalloc(sizeof(*cl->key)); cl->key->key = NULL; } if(cl->key->key) @@ -657,13 +664,14 @@ void set_keys(conn_list_t *cl, key_req_t *k) cl->key->expiry = k->expiry; cl->key->key = xmalloc(strlen(ek) + 1); strcpy(cl->key->key, ek); +cp } int ans_key_h(conn_list_t *cl, unsigned char *d, int len) { key_req_t *tmp = (key_req_t*)d; conn_list_t *fw, *gk; - +cp if(debug_lvl > 3) syslog(LOG_DEBUG, "got ANS_KEY from " IP_ADDR_S " for " IP_ADDR_S, IP_ADDR_V(tmp->from), IP_ADDR_V(tmp->to)); @@ -673,6 +681,14 @@ int ans_key_h(conn_list_t *cl, unsigned char *d, int len) if(debug_lvl > 2) syslog(LOG_DEBUG, "Yeah! key arrived. Now do something with it."); gk = lookup_conn(tmp->from); + + if(!gk) + { + syslog(LOG_ERR, "Receiving key from " IP_ADDR_S ", which does not exist?", + IP_ADDR_V(tmp->from)); + return -1; + } + set_keys(gk, tmp); gk->status.validkey = 1; gk->status.waitingforkey = 0; @@ -681,15 +697,23 @@ int ans_key_h(conn_list_t *cl, unsigned char *d, int len) } fw = lookup_conn(tmp->to); + + if(!fw) + { + syslog(LOG_ERR, "Attempting to forward key to " IP_ADDR_S ", which does not exist?", + IP_ADDR_V(tmp->to)); + return -1; + } + if(debug_lvl > 2) syslog(LOG_DEBUG, "Forwarding public key to " IP_ADDR_S, IP_ADDR_V(fw->nexthop->vpn_ip)); - if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t)+tmp->len, 0) < 0) + if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)+tmp->len) < 0) { syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); return -1; } - +cp return 0; } @@ -697,12 +721,20 @@ int key_changed_h(conn_list_t *cl, unsigned char *d, int len) { key_changed_t *tmp = (key_changed_t*)d; conn_list_t *ik; - +cp if(debug_lvl > 2) syslog(LOG_DEBUG, "got KEY_CHANGED from " IP_ADDR_S, IP_ADDR_V(tmp->from)); ik = lookup_conn(tmp->from); + + if(!ik) + { + syslog(LOG_ERR, "Got changed key from " IP_ADDR_S ", which does not exist?", + IP_ADDR_V(tmp->from)); + return -1; + } + ik->status.validkey = 0; ik->status.waitingforkey = 0; @@ -710,7 +742,7 @@ int key_changed_h(conn_list_t *cl, unsigned char *d, int len) syslog(LOG_DEBUG, "Forwarding key invalidation request"); notify_others(cl, ik, send_key_changed); - +cp return 0; } @@ -736,4 +768,3 @@ int (*request_handlers[256])(conn_list_t*, unsigned char*, int) = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; -