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a11e19b7 GE |
1 | /*************************************************************************** |
2 | * Copyright (C) 2006 by Gerd v. Egidy * | |
3 | * gve@intra2net.com * | |
4 | * * | |
5 | * This library is free software; you can redistribute it and/or modify * | |
6 | * it under the terms of the GNU Lesser General Public License version * | |
7 | * 2.1 as published by the Free Software Foundation. * | |
8 | * * | |
9 | * This library is distributed in the hope that it will be useful, * | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
12 | * GNU Lesser General Public License for more details. * | |
13 | * * | |
14 | * You should have received a copy of the GNU Lesser General Public * | |
15 | * License along with this program; if not, write to the * | |
16 | * Free Software Foundation, Inc., * | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * | |
18 | ***************************************************************************/ | |
19 | ||
20 | #include <string> | |
21 | #include <sstream> | |
a7170401 | 22 | #include <iostream> |
af84dfb5 | 23 | #include <stdexcept> |
a11e19b7 | 24 | |
8104c8f7 GE |
25 | #include <netinet/in.h> |
26 | ||
a11e19b7 GE |
27 | #include "connection.hxx" |
28 | ||
29 | namespace libt2n | |
30 | { | |
31 | ||
a64066eb GE |
32 | connection::~connection() |
33 | { | |
34 | // we want the connection_closed callbacks to be called before | |
35 | close(); | |
36 | ||
37 | do_callbacks(connection_deleted); | |
38 | } | |
39 | ||
40 | void connection::close() | |
41 | { | |
42 | if (!is_closed()) | |
43 | { | |
44 | closed=true; | |
45 | do_callbacks(connection_closed); | |
46 | } | |
47 | } | |
48 | ||
487afb79 | 49 | /// get the number of bytes being available as next complete packet |
a11e19b7 GE |
50 | connection::packet_size_indicator connection::bytes_available() |
51 | { | |
a11e19b7 | 52 | // no size information -> no packet |
8104c8f7 | 53 | if (buffer.size() < sizeof(packet_size_indicator)) |
644c4d26 | 54 | return 0; |
a11e19b7 | 55 | |
8104c8f7 | 56 | packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data()))); |
a11e19b7 GE |
57 | |
58 | // enough data for one packet in buffer? | |
8104c8f7 | 59 | if (buffer.size() < sizeof(packet_size_indicator)+psize) |
644c4d26 | 60 | return 0; |
a11e19b7 GE |
61 | |
62 | // ok, full packet there | |
644c4d26 | 63 | return psize; |
a11e19b7 GE |
64 | } |
65 | ||
94247295 GE |
66 | /** @brief read a complete data packet from the buffer. The packet is removed from the |
67 | connection buffer. | |
68 | @param[out] data the data package | |
69 | @retval true if packet found | |
70 | */ | |
a11e19b7 GE |
71 | bool connection::get_packet(std::string& data) |
72 | { | |
73 | packet_size_indicator psize; | |
74 | ||
75 | if ((psize=bytes_available())) | |
76 | { | |
8104c8f7 GE |
77 | data.assign(buffer,sizeof(packet_size_indicator),psize); |
78 | buffer.erase(0,sizeof(packet_size_indicator)+psize); | |
a11e19b7 GE |
79 | return true; |
80 | } | |
81 | else | |
82 | return false; | |
83 | } | |
84 | ||
b2ba0928 GE |
85 | /** @brief get (maybe incomplete) data of the next packet from the buffer. Does not remove the data |
86 | from the connection buffer. | |
87 | @param[out] data the data package | |
88 | @retval full size of the packet when it will be complete | |
89 | */ | |
90 | unsigned int connection::peek_packet(std::string& data) | |
91 | { | |
92 | // no size information -> no packet | |
93 | if (buffer.size() < sizeof(packet_size_indicator)) | |
94 | return 0; | |
95 | ||
96 | packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data()))); | |
97 | ||
98 | // not the full data available? | |
99 | packet_size_indicator currsize=psize; | |
100 | if (buffer.size() < currsize+sizeof(packet_size_indicator)) | |
101 | currsize=buffer.size()-sizeof(packet_size_indicator); | |
102 | ||
103 | data.assign(buffer,sizeof(packet_size_indicator),currsize); | |
104 | ||
105 | return psize; | |
106 | } | |
107 | ||
af84dfb5 GE |
108 | /// remove all data from buffer that is not a complete packet |
109 | void connection::remove_incomplete_packets() | |
110 | { | |
111 | std::string::size_type p=0; | |
112 | std::string::size_type end=buffer.size(); | |
113 | ||
114 | while (p < end) | |
115 | { | |
116 | // not enough space for size information -> no packet | |
117 | if (p+sizeof(packet_size_indicator) > end) | |
118 | break; | |
119 | ||
120 | packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data()+p))); | |
121 | ||
122 | if (p+sizeof(packet_size_indicator)+psize > end) | |
123 | { | |
124 | // incomplete packet | |
125 | break; | |
126 | } | |
127 | else | |
128 | { | |
129 | // move p to where the next packet will start | |
130 | p+=sizeof(packet_size_indicator)+psize; | |
131 | } | |
132 | } | |
133 | ||
134 | if (p < end) | |
135 | { | |
136 | // incomplete packets there, remove them | |
137 | buffer.erase(p); | |
138 | } | |
139 | } | |
140 | ||
94247295 | 141 | /// send a blob to the peer |
a11e19b7 GE |
142 | void connection::write(const std::string& data) |
143 | { | |
144 | // prepend packet size to data | |
8104c8f7 | 145 | packet_size_indicator psize=htonl(data.size()); |
a11e19b7 | 146 | std::string send_data(data); |
644c4d26 | 147 | send_data.insert(0,(char*)&psize,sizeof(packet_size_indicator)); |
a11e19b7 GE |
148 | |
149 | real_write(send_data); | |
150 | } | |
151 | ||
a64066eb GE |
152 | /** @brief add a callback |
153 | ||
154 | @param event event the function will be called at | |
155 | @param func functor (see boost function) that will be called | |
156 | ||
157 | @note use boost::bind to bind to member functions and parameters like this: | |
158 | 17 is a fixed parameter that is always added to the call | |
159 | c.add_callback(connection_closed,bind(&my_class::func_to_call_back, boost::ref(*this), 17)); | |
160 | */ | |
161 | void connection::add_callback(callback_event_type event, const boost::function<void ()>& func) | |
162 | { | |
a64066eb GE |
163 | callbacks[event].push_back(func); |
164 | } | |
165 | ||
166 | /** @brief an event has occured, execute the callbacks that are registered for this event | |
167 | ||
168 | @param event event type that has occured | |
169 | */ | |
170 | void connection::do_callbacks(callback_event_type event) | |
171 | { | |
172 | std::list<boost::function<void ()> >::iterator i,ie=callbacks[event].end(); | |
173 | for (i=callbacks[event].begin(); i != ie; i++) | |
174 | (*i)(); | |
175 | } | |
176 | ||
177 | /** @brief get the callbacks in place for one event | |
178 | ||
179 | @param event event the callbacks should be registered for | |
180 | @return std::list of functors (boost::function) with the callbacks | |
181 | ||
182 | @note if you want to get the callbacks for all events, loop from 0 to __events_end | |
183 | */ | |
184 | std::list<boost::function<void ()> > connection::get_callback_list(callback_event_type event) | |
185 | { | |
186 | return callbacks[event]; | |
187 | } | |
188 | ||
af84dfb5 GE |
189 | /** @brief reopen a already closed connection, removes incomplete packets from the buffer |
190 | ||
191 | @note Only call when the connection is closed. | |
192 | ||
193 | @note Justs cares about the data of connection, reconnecting has to be | |
194 | done in a derived class. | |
195 | */ | |
196 | void connection::reopen() | |
197 | { | |
198 | if (!is_closed()) | |
199 | throw std::logic_error("connection::reopen() called with connection still open"); | |
200 | ||
201 | closed=false; | |
202 | ||
203 | // incomplete buffer data is worthless with a new connection | |
204 | remove_incomplete_packets(); | |
205 | ||
206 | do_callbacks(new_connection); | |
207 | } | |
a64066eb | 208 | |
a11e19b7 | 209 | } |