1 #ifndef TINC_CONNECTION_H
2 #define TINC_CONNECTION_H
5 connection.h -- header for connection.c
6 Copyright (C) 2000-2013 Guus Sliepen <guus@tinc-vpn.org>,
7 2000-2005 Ivo Timmermans
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License along
20 with this program; if not, write to the Free Software Foundation, Inc.,
21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 #define OPTION_INDIRECT 0x0001
33 #define OPTION_TCPONLY 0x0002
34 #define OPTION_PMTU_DISCOVERY 0x0004
35 #define OPTION_CLAMP_MSS 0x0008
36 #define OPTION_VERSION(x) ((x) >> 24) /* Top 8 bits are for protocol minor version */
38 typedef union connection_status_t {
40 bool pinged: 1; /* sent ping */
41 bool unused_active: 1;
42 bool connecting: 1; /* 1 if we are waiting for a non-blocking connect() to finish */
43 bool unused_termreq: 1; /* the termination of this connection was requested */
44 bool remove_unused: 1; /* Set to 1 if you want this connection removed */
45 bool timeout_unused: 1; /* 1 if gotten timeout */
46 bool encryptout: 1; /* 1 if we can encrypt outgoing traffic */
47 bool decryptin: 1; /* 1 if we have to decrypt incoming traffic */
48 bool mst: 1; /* 1 if this connection is part of a minimum spanning tree */
49 bool control: 1; /* 1 if this is a control connection */
50 bool pcap: 1; /* 1 if this is a control connection requesting packet capture */
51 bool log: 1; /* 1 if this is a control connection requesting log dump */
52 bool log_color: 1; /* 1 if this connection supports ANSI escape codes */
53 bool invitation: 1; /* 1 if this is an invitation */
54 bool invitation_used: 1; /* 1 if the invitation has been consumed */
55 bool tarpit: 1; /* 1 if the connection should be added to the tarpit */
58 } connection_status_t;
65 #ifndef DISABLE_LEGACY
66 typedef struct legacy_crypto_t {
72 bool init_crypto_by_nid(legacy_crypto_t *c, nid_t cipher, nid_t digest) ATTR_WARN_UNUSED;
73 bool init_crypto_by_name(legacy_crypto_t *c, const char *cipher, const char *digest) ATTR_WARN_UNUSED;
74 bool decrease_budget(legacy_crypto_t *c, size_t bytes) ATTR_WARN_UNUSED;
76 typedef struct legacy_ctx_t {
77 rsa_t *rsa; /* his public RSA key or my private RSA key */
78 legacy_crypto_t in; /* cipher/digest he will use to send data to us */
79 legacy_crypto_t out; /* cipher/digest we will use to send data to him */
82 legacy_ctx_t *new_legacy_ctx(rsa_t *rsa) ATTR_MALLOC;
83 void free_legacy_ctx(legacy_ctx_t *ctx);
86 typedef struct connection_t {
87 char *name; /* name he claims to have */
88 char *hostname; /* the hostname of its real ip */
90 union sockaddr_t address; /* his real (internet) ip */
91 int protocol_major; /* used protocol */
92 int protocol_minor; /* used protocol */
94 int socket; /* socket used for this connection */
95 uint32_t options; /* options for this connection */
96 connection_status_t status; /* status info */
97 int estimated_weight; /* estimation for the weight of the edge for this connection */
98 struct timeval start; /* time this connection was started, used for above estimation */
99 struct outgoing_t *outgoing; /* used to keep track of outgoing connections */
101 struct node_t *node; /* node associated with the other end */
102 struct edge_t *edge; /* edge associated with this connection */
104 #ifndef DISABLE_LEGACY
105 legacy_ctx_t *legacy;
108 ecdsa_t *ecdsa; /* his public ECDSA key */
112 debug_t log_level; /* used for REQ_LOG */
114 uint8_t *hischallenge; /* The challenge we sent to him */
115 uint8_t *mychallenge; /* The challenge we received */
117 struct buffer_t inbuf;
118 struct buffer_t outbuf;
119 io_t io; /* input/output event on this metadata connection */
120 uint32_t tcplen; /* length of incoming TCPpacket */
121 uint32_t sptpslen; /* length of incoming SPTPS packet */
122 int allow_request; /* defined if there's only one request possible */
124 time_t last_ping_time; /* last time we saw some activity from the other end or pinged them */
126 splay_tree_t *config_tree; /* Pointer to configuration tree belonging to him */
129 extern list_t connection_list;
130 extern connection_t *everyone;
132 extern void init_connections(void);
133 extern void exit_connections(void);
134 extern connection_t *new_connection(void) ATTR_MALLOC;
135 extern void free_connection(connection_t *c);
136 extern void connection_add(connection_t *c);
137 extern void connection_del(connection_t *c);
138 extern bool dump_connections(struct connection_t *c);