remote.h revision 307729 
1/*
2 * daemon/remote.h - remote control for the unbound daemon.
3 *
4 * Copyright (c) 2008, NLnet Labs. All rights reserved.
5 *
6 * This software is open source.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 *
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 *
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36/**
37 * \file
38 *
39 * This file contains the remote control functionality for the daemon.
40 * The remote control can be performed using either the commandline
41 * unbound-control tool, or a SSLv3/TLS capable web browser.
42 * The channel is secured using SSLv3 or TLSv1, and certificates.
43 * Both the server and the client(control tool) have their own keys.
44 */
45
46#ifndef DAEMON_REMOTE_H
47#define DAEMON_REMOTE_H
48#ifdef HAVE_OPENSSL_SSL_H
49#include "openssl/ssl.h"
50#endif
51struct config_file;
52struct listen_list;
53struct listen_port;
54struct worker;
55struct comm_reply;
56struct comm_point;
57struct daemon_remote;
58
59/** number of milliseconds timeout on incoming remote control handshake */
60#define REMOTE_CONTROL_TCP_TIMEOUT 120000
61
62/**
63 * a busy control command connection, SSL state
64 */
65struct rc_state {
66	/** the next item in list */
67	struct rc_state* next;
68	/** the commpoint */
69	struct comm_point* c;
70	/** in the handshake part */
71	enum { rc_none, rc_hs_read, rc_hs_write } shake_state;
72#ifdef HAVE_SSL
73	/** the ssl state */
74	SSL* ssl;
75#endif
76	/** the rc this is part of */
77	struct daemon_remote* rc;
78};
79
80/**
81 * The remote control tool state.
82 * The state is only created for the first thread, other threads
83 * are called from this thread.  Only the first threads listens to
84 * the control port.  The other threads do not, but are called on the
85 * command channel(pipe) from the first thread.
86 */
87struct daemon_remote {
88	/** the worker for this remote control */
89	struct worker* worker;
90	/** commpoints for accepting remote control connections */
91	struct listen_list* accept_list;
92	/* if certificates are used */
93	int use_cert;
94	/** number of active commpoints that are handling remote control */
95	int active;
96	/** max active commpoints */
97	int max_active;
98	/** current commpoints busy; should be a short list, malloced */
99	struct rc_state* busy_list;
100#ifdef HAVE_SSL
101	/** the SSL context for creating new SSL streams */
102	SSL_CTX* ctx;
103#endif
104};
105
106/**
107 * Create new remote control state for the daemon.
108 * @param cfg: config file with key file settings.
109 * @return new state, or NULL on failure.
110 */
111struct daemon_remote* daemon_remote_create(struct config_file* cfg);
112
113/**
114 * remote control state to delete.
115 * @param rc: state to delete.
116 */
117void daemon_remote_delete(struct daemon_remote* rc);
118
119/**
120 * remote control state to clear up. Busy and accept points are closed.
121 * Does not delete the rc itself, or the ssl context (with its keys).
122 * @param rc: state to clear.
123 */
124void daemon_remote_clear(struct daemon_remote* rc);
125
126/**
127 * Open and create listening ports for remote control.
128 * @param cfg: config options.
129 * @return list of ports or NULL on failure.
130 *	can be freed with listening_ports_free().
131 */
132struct listen_port* daemon_remote_open_ports(struct config_file* cfg);
133
134/**
135 * Setup comm points for accepting remote control connections.
136 * @param rc: state
137 * @param ports: already opened ports.
138 * @param worker: worker with communication base. and links to command channels.
139 * @return false on error.
140 */
141int daemon_remote_open_accept(struct daemon_remote* rc,
142	struct listen_port* ports, struct worker* worker);
143
144/**
145 * Stop accept handlers for TCP (until enabled again)
146 * @param rc: state
147 */
148void daemon_remote_stop_accept(struct daemon_remote* rc);
149
150/**
151 * Stop accept handlers for TCP (until enabled again)
152 * @param rc: state
153 */
154void daemon_remote_start_accept(struct daemon_remote* rc);
155
156/**
157 * Handle nonthreaded remote cmd execution.
158 * @param worker: this worker (the remote worker).
159 */
160void daemon_remote_exec(struct worker* worker);
161
162#ifdef HAVE_SSL
163/**
164 * Print fixed line of text over ssl connection in blocking mode
165 * @param ssl: print to
166 * @param text: the text.
167 * @return false on connection failure.
168 */
169int ssl_print_text(SSL* ssl, const char* text);
170
171/**
172 * printf style printing to the ssl connection
173 * @param ssl: the SSL connection to print to. Blocking.
174 * @param format: printf style format string.
175 * @return success or false on a network failure.
176 */
177int ssl_printf(SSL* ssl, const char* format, ...)
178        ATTR_FORMAT(printf, 2, 3);
179
180/**
181 * Read until \n is encountered
182 * If SSL signals EOF, the string up to then is returned (without \n).
183 * @param ssl: the SSL connection to read from. blocking.
184 * @param buf: buffer to read to.
185 * @param max: size of buffer.
186 * @return false on connection failure.
187 */
188int ssl_read_line(SSL* ssl, char* buf, size_t max);
189#endif /* HAVE_SSL */
190
191#endif /* DAEMON_REMOTE_H */
192