2 * daemon/remote.h - remote control for the unbound daemon.
4 * Copyright (c) 2008, NLnet Labs. All rights reserved.
6 * This software is open source.
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9 * modification, are permitted provided that the following conditions
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13 * this list of conditions and the following disclaimer.
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16 * this list of conditions and the following disclaimer in the documentation
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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.
46 #ifndef DAEMON_REMOTE_H
47 #define DAEMON_REMOTE_H
48 #ifdef HAVE_OPENSSL_SSL_H
49 #include "openssl/ssl.h"
59 /** number of seconds timeout on incoming remote control handshake */
60 #define REMOTE_CONTROL_TCP_TIMEOUT 120
63 * a busy control command connection, SSL state
66 /** the next item in list */
67 struct rc_state* next;
70 /** in the handshake part */
71 enum { rc_none, rc_hs_read, rc_hs_write } shake_state;
74 /** the rc this is part of */
75 struct daemon_remote* rc;
79 * The remote control tool state.
80 * The state is only created for the first thread, other threads
81 * are called from this thread. Only the first threads listens to
82 * the control port. The other threads do not, but are called on the
83 * command channel(pipe) from the first thread.
85 struct daemon_remote {
86 /** the worker for this remote control */
87 struct worker* worker;
88 /** commpoints for accepting remote control connections */
89 struct listen_list* accept_list;
90 /** number of active commpoints that are handling remote control */
92 /** max active commpoints */
94 /** current commpoints busy; should be a short list, malloced */
95 struct rc_state* busy_list;
96 /** the SSL context for creating new SSL streams */
101 * Create new remote control state for the daemon.
102 * @param cfg: config file with key file settings.
103 * @return new state, or NULL on failure.
105 struct daemon_remote* daemon_remote_create(struct config_file* cfg);
108 * remote control state to delete.
109 * @param rc: state to delete.
111 void daemon_remote_delete(struct daemon_remote* rc);
114 * remote control state to clear up. Busy and accept points are closed.
115 * Does not delete the rc itself, or the ssl context (with its keys).
116 * @param rc: state to clear.
118 void daemon_remote_clear(struct daemon_remote* rc);
121 * Open and create listening ports for remote control.
122 * @param cfg: config options.
123 * @return list of ports or NULL on failure.
124 * can be freed with listening_ports_free().
126 struct listen_port* daemon_remote_open_ports(struct config_file* cfg);
129 * Setup comm points for accepting remote control connections.
131 * @param ports: already opened ports.
132 * @param worker: worker with communication base. and links to command channels.
133 * @return false on error.
135 int daemon_remote_open_accept(struct daemon_remote* rc,
136 struct listen_port* ports, struct worker* worker);
139 * Stop accept handlers for TCP (until enabled again)
142 void daemon_remote_stop_accept(struct daemon_remote* rc);
145 * Stop accept handlers for TCP (until enabled again)
148 void daemon_remote_start_accept(struct daemon_remote* rc);
151 * Handle nonthreaded remote cmd execution.
152 * @param worker: this worker (the remote worker).
154 void daemon_remote_exec(struct worker* worker);
156 /** handle remote control accept callbacks */
157 int remote_accept_callback(struct comm_point*, void*, int, struct comm_reply*);
159 /** handle remote control data callbacks */
160 int remote_control_callback(struct comm_point*, void*, int, struct comm_reply*);
163 * Print fixed line of text over ssl connection in blocking mode
164 * @param ssl: print to
165 * @param text: the text.
166 * @return false on connection failure.
168 int ssl_print_text(SSL* ssl, const char* text);
171 * printf style printing to the ssl connection
172 * @param ssl: the SSL connection to print to. Blocking.
173 * @param format: printf style format string.
174 * @return success or false on a network failure.
176 int ssl_printf(SSL* ssl, const char* format, ...)
177 ATTR_FORMAT(printf, 2, 3);
180 * Read until \n is encountered
181 * If SSL signals EOF, the string up to then is returned (without \n).
182 * @param ssl: the SSL connection to read from. blocking.
183 * @param buf: buffer to read to.
184 * @param max: size of buffer.
185 * @return false on connection failure.
187 int ssl_read_line(SSL* ssl, char* buf, size_t max);
189 /** routine to printout option values over SSL */
190 void remote_get_opt_ssl(char* line, void* arg);
192 #endif /* DAEMON_REMOTE_H */