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/* |
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connection.h -- header for connection.C |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#ifndef VPE_CONNECTION_H__ |
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#define VPE_CONNECTION_H__ |
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|
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#include <netinet/ip.h> // for tos etc. |
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|
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#include <openssl/rand.h> |
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#include <openssl/hmac.h> |
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#include <openssl/evp.h> |
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#include <openssl/rsa.h> |
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#include <openssl/err.h> |
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|
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#include "global.h" |
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#include "conf.h" |
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#include "sockinfo.h" |
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#include "util.h" |
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#include "device.h" |
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|
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struct vpn; |
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|
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// called after HUP etc. to (re-)initialize global data structures |
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void connection_init (); |
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|
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struct rsaid { |
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u8 id[RSA_IDLEN]; // the challenge id |
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}; |
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|
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typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
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typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
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typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash |
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|
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//////////////////////////////////////////////////////////////////////////////////////// |
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|
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struct crypto_ctx; |
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|
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struct hmac_packet:net_packet |
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{ |
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u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
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|
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void hmac_set (crypto_ctx * ctx); |
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bool hmac_chk (crypto_ctx * ctx); |
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|
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private: |
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static unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
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|
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void hmac_gen (crypto_ctx * ctx); |
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}; |
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|
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struct vpn_packet : hmac_packet |
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{ |
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enum ptype |
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{ |
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PT_RESET = 0, |
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PT_DATA_UNCOMPRESSED, |
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PT_DATA_COMPRESSED, |
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PT_PING, PT_PONG, // wasting namespace space? ;) |
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PT_AUTH_REQ, // authentification request |
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PT_AUTH_RES, // authentification response |
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PT_CONNECT_REQ, // want other host to contact me |
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PT_CONNECT_INFO, // request connection to some node |
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PT_MAX |
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}; |
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|
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u8 type; |
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u8 srcdst, src1, dst1; |
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|
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void set_hdr (ptype type, unsigned int dst); |
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|
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unsigned int src () const |
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{ |
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return src1 | ((srcdst >> 4) << 8); |
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} |
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|
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unsigned int dst () const |
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{ |
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return dst1 | ((srcdst & 0xf) << 8); |
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} |
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|
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ptype typ () const |
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{ |
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return (ptype) type; |
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} |
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}; |
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|
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//////////////////////////////////////////////////////////////////////////////////////// |
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|
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// a very simple fifo pkt-queue |
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class pkt_queue |
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{ |
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tap_packet *queue[QUEUEDEPTH]; |
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int i, j; |
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|
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public: |
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|
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void put (tap_packet *p); |
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tap_packet *get (); |
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|
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pkt_queue (); |
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~pkt_queue (); |
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}; |
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|
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struct connection |
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{ |
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conf_node *conf; |
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struct vpn *vpn; |
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|
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sockinfo si; // the current(!) destination ip to send packets to |
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int retry_cnt; |
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|
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tstamp last_activity; // time of last packet received |
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|
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u32 oseqno; |
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sliding_window iseqno; |
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|
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u8 protocol; |
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|
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pkt_queue queue; |
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|
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crypto_ctx *octx, *ictx; |
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|
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enum conf_node::connectmode connectmode; |
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u8 prot_minor; // minor number of other side |
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|
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void reset_dstaddr (); |
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|
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void shutdown (); |
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void reset_connection (); |
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void establish_connection_cb (tstamp &ts); time_watcher establish_connection; |
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void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing) |
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void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe |
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|
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void send_auth_request (const sockinfo &si, bool initiate); |
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void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg); |
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void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols); |
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void send_reset (const sockinfo &dsi); |
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void send_ping (const sockinfo &dsi, u8 pong = 0); |
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void send_data_packet (tap_packet *pkt, bool broadcast = false); |
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void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
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void connect_request (int id); |
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|
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void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY); |
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void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi); |
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|
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void script_node (); |
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const char *script_node_up (int); |
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const char *script_node_down (int); |
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|
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void dump_status (); |
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|
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connection(struct vpn *vpn_); |
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~connection (); |
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}; |
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|
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#endif |
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