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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 | ||
a11e19b7 GE |
49 | connection::packet_size_indicator connection::bytes_available() |
50 | { | |
a11e19b7 | 51 | // no size information -> no packet |
8104c8f7 | 52 | if (buffer.size() < sizeof(packet_size_indicator)) |
644c4d26 | 53 | return 0; |
a11e19b7 | 54 | |
8104c8f7 | 55 | packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data()))); |
a11e19b7 GE |
56 | |
57 | // enough data for one packet in buffer? | |
8104c8f7 | 58 | if (buffer.size() < sizeof(packet_size_indicator)+psize) |
644c4d26 | 59 | return 0; |
a11e19b7 GE |
60 | |
61 | // ok, full packet there | |
644c4d26 | 62 | return psize; |
a11e19b7 GE |
63 | } |
64 | ||
94247295 GE |
65 | /** @brief read a complete data packet from the buffer. The packet is removed from the |
66 | connection buffer. | |
67 | @param[out] data the data package | |
68 | @retval true if packet found | |
69 | */ | |
a11e19b7 GE |
70 | bool connection::get_packet(std::string& data) |
71 | { | |
72 | packet_size_indicator psize; | |
73 | ||
74 | if ((psize=bytes_available())) | |
75 | { | |
8104c8f7 GE |
76 | data.assign(buffer,sizeof(packet_size_indicator),psize); |
77 | buffer.erase(0,sizeof(packet_size_indicator)+psize); | |
a11e19b7 GE |
78 | return true; |
79 | } | |
80 | else | |
81 | return false; | |
82 | } | |
83 | ||
b2ba0928 GE |
84 | /** @brief get (maybe incomplete) data of the next packet from the buffer. Does not remove the data |
85 | from the connection buffer. | |
86 | @param[out] data the data package | |
87 | @retval full size of the packet when it will be complete | |
88 | */ | |
89 | unsigned int connection::peek_packet(std::string& data) | |
90 | { | |
91 | // no size information -> no packet | |
92 | if (buffer.size() < sizeof(packet_size_indicator)) | |
93 | return 0; | |
94 | ||
95 | packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data()))); | |
96 | ||
97 | // not the full data available? | |
98 | packet_size_indicator currsize=psize; | |
99 | if (buffer.size() < currsize+sizeof(packet_size_indicator)) | |
100 | currsize=buffer.size()-sizeof(packet_size_indicator); | |
101 | ||
102 | data.assign(buffer,sizeof(packet_size_indicator),currsize); | |
103 | ||
104 | return psize; | |
105 | } | |
106 | ||
af84dfb5 GE |
107 | /// remove all data from buffer that is not a complete packet |
108 | void connection::remove_incomplete_packets() | |
109 | { | |
110 | std::string::size_type p=0; | |
111 | std::string::size_type end=buffer.size(); | |
112 | ||
113 | while (p < end) | |
114 | { | |
115 | // not enough space for size information -> no packet | |
116 | if (p+sizeof(packet_size_indicator) > end) | |
117 | break; | |
118 | ||
119 | packet_size_indicator psize=ntohl(*((packet_size_indicator*)(buffer.data()+p))); | |
120 | ||
121 | if (p+sizeof(packet_size_indicator)+psize > end) | |
122 | { | |
123 | // incomplete packet | |
124 | break; | |
125 | } | |
126 | else | |
127 | { | |
128 | // move p to where the next packet will start | |
129 | p+=sizeof(packet_size_indicator)+psize; | |
130 | } | |
131 | } | |
132 | ||
133 | if (p < end) | |
134 | { | |
135 | // incomplete packets there, remove them | |
136 | buffer.erase(p); | |
137 | } | |
138 | } | |
139 | ||
94247295 | 140 | /// send a blob to the peer |
a11e19b7 GE |
141 | void connection::write(const std::string& data) |
142 | { | |
143 | // prepend packet size to data | |
8104c8f7 | 144 | packet_size_indicator psize=htonl(data.size()); |
a11e19b7 | 145 | std::string send_data(data); |
644c4d26 | 146 | send_data.insert(0,(char*)&psize,sizeof(packet_size_indicator)); |
a11e19b7 GE |
147 | |
148 | real_write(send_data); | |
149 | } | |
150 | ||
a64066eb GE |
151 | /** @brief add a callback |
152 | ||
153 | @param event event the function will be called at | |
154 | @param func functor (see boost function) that will be called | |
155 | ||
156 | @note use boost::bind to bind to member functions and parameters like this: | |
157 | 17 is a fixed parameter that is always added to the call | |
158 | c.add_callback(connection_closed,bind(&my_class::func_to_call_back, boost::ref(*this), 17)); | |
159 | */ | |
160 | void connection::add_callback(callback_event_type event, const boost::function<void ()>& func) | |
161 | { | |
a64066eb GE |
162 | callbacks[event].push_back(func); |
163 | } | |
164 | ||
165 | /** @brief an event has occured, execute the callbacks that are registered for this event | |
166 | ||
167 | @param event event type that has occured | |
168 | */ | |
169 | void connection::do_callbacks(callback_event_type event) | |
170 | { | |
171 | std::list<boost::function<void ()> >::iterator i,ie=callbacks[event].end(); | |
172 | for (i=callbacks[event].begin(); i != ie; i++) | |
173 | (*i)(); | |
174 | } | |
175 | ||
176 | /** @brief get the callbacks in place for one event | |
177 | ||
178 | @param event event the callbacks should be registered for | |
179 | @return std::list of functors (boost::function) with the callbacks | |
180 | ||
181 | @note if you want to get the callbacks for all events, loop from 0 to __events_end | |
182 | */ | |
183 | std::list<boost::function<void ()> > connection::get_callback_list(callback_event_type event) | |
184 | { | |
185 | return callbacks[event]; | |
186 | } | |
187 | ||
af84dfb5 GE |
188 | /** @brief reopen a already closed connection, removes incomplete packets from the buffer |
189 | ||
190 | @note Only call when the connection is closed. | |
191 | ||
192 | @note Justs cares about the data of connection, reconnecting has to be | |
193 | done in a derived class. | |
194 | */ | |
195 | void connection::reopen() | |
196 | { | |
197 | if (!is_closed()) | |
198 | throw std::logic_error("connection::reopen() called with connection still open"); | |
199 | ||
200 | closed=false; | |
201 | ||
202 | // incomplete buffer data is worthless with a new connection | |
203 | remove_incomplete_packets(); | |
204 | ||
205 | do_callbacks(new_connection); | |
206 | } | |
a64066eb | 207 | |
a11e19b7 | 208 | } |