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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 <stdio.h> | |
21 | #include <errno.h> | |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/types.h> | |
25 | #include <sys/socket.h> | |
26 | #include <sys/un.h> | |
27 | #include <sys/time.h> | |
28 | #include <arpa/inet.h> | |
29 | #include <netinet/in.h> | |
30 | #include <netdb.h> | |
31 | #include <fcntl.h> | |
32 | #include <time.h> | |
33 | #include <pwd.h> | |
34 | #include <grp.h> | |
35 | ||
36 | #include <sstream> | |
644c4d26 | 37 | #include <iostream> |
a11e19b7 GE |
38 | |
39 | #include "socket_handler.hxx" | |
40 | #include "t2n_exception.hxx" | |
41 | ||
42 | using namespace std; | |
43 | ||
44 | namespace libt2n | |
45 | { | |
46 | ||
94247295 | 47 | /// set options like fast reuse and keepalive every socket should have |
a11e19b7 GE |
48 | void socket_handler::set_socket_options(int sock) |
49 | { | |
50 | int i=1; | |
51 | ||
52 | /* fast reuse enable */ | |
53 | if (setsockopt(sock,SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i)) < 0) | |
54 | { | |
55 | string err="error setting socket option: "; | |
56 | err+=strerror(errno); | |
57 | log(error, err); | |
58 | throw t2n_communication_error(err); | |
59 | } | |
60 | ||
61 | /* keepalive enable */ | |
62 | if (setsockopt(sock,SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i)) < 0) | |
63 | { | |
64 | string err="error setting socket option: "; | |
65 | err+=strerror(errno); | |
66 | log(error, err); | |
67 | throw t2n_communication_error(err); | |
68 | } | |
69 | ||
70 | /* close on exec */ | |
71 | int fdflags; | |
72 | fdflags=fcntl(sock,F_GETFD, 0); | |
73 | if (fdflags < 0) | |
74 | { | |
75 | string err="fcntl error on socket: "; | |
76 | err+=strerror(errno); | |
77 | log(error, err); | |
78 | throw t2n_communication_error(err); | |
79 | } | |
80 | fdflags |= FD_CLOEXEC; | |
81 | if (fcntl(sock,F_SETFD,fdflags) < 0) | |
82 | { | |
83 | string err="fcntl error on socket: "; | |
84 | err+=strerror(errno); | |
85 | log(error, err); | |
86 | throw t2n_communication_error(err); | |
87 | } | |
88 | ||
89 | /* non-blocking mode */ | |
90 | int flflags; | |
91 | flflags=fcntl(sock,F_GETFL,0); | |
92 | if (flflags < 0) | |
93 | { | |
94 | string err="fcntl error on socket: "; | |
95 | err+=strerror(errno); | |
96 | log(error, err); | |
97 | throw t2n_communication_error(err); | |
98 | } | |
99 | flflags |= O_NONBLOCK; | |
100 | if (fcntl(sock,F_SETFL,flflags) < 0) | |
101 | { | |
102 | string err="fcntl error on socket: "; | |
103 | err+=strerror(errno); | |
104 | log(error, err); | |
105 | throw t2n_communication_error(err); | |
106 | } | |
107 | } | |
108 | ||
94247295 GE |
109 | /// close the underlying socket connection. Don't call directly, use the version provided |
110 | /// by the connection class you are using. | |
a11e19b7 GE |
111 | void socket_handler::close() |
112 | { | |
644c4d26 GE |
113 | // graceful shutdown |
114 | shutdown(sock,SHUT_RDWR); | |
a11e19b7 GE |
115 | ::close(sock); |
116 | } | |
117 | ||
94247295 | 118 | /// is the underlying socket connection still open? |
644c4d26 GE |
119 | bool socket_handler::is_closed() |
120 | { | |
121 | int r=fcntl(sock,F_GETFL); | |
122 | ||
123 | return !(r & O_ACCMODE); | |
124 | } | |
125 | ||
94247295 GE |
126 | /** @brief check if new data is waiting on the raw socket |
127 | @param usec_timeout wait until new data is found, max timeout usecs. | |
128 | -1: wait endless | |
129 | NULL: no timeout | |
130 | */ | |
a11e19b7 GE |
131 | bool socket_handler::data_waiting(long long usec_timeout) |
132 | { | |
133 | // just our socket | |
134 | fd_set active_fd_set; | |
135 | FD_ZERO (&active_fd_set); | |
136 | FD_SET (sock, &active_fd_set); | |
137 | ||
138 | /* set timeout */ | |
139 | struct timeval tval; | |
140 | struct timeval *timeout_ptr; | |
141 | ||
142 | if (usec_timeout == -1) | |
143 | timeout_ptr = NULL; | |
144 | else | |
145 | { | |
146 | timeout_ptr = &tval; | |
147 | ||
148 | // timeout von long long usec in int sec + int usec umrechnen | |
149 | tval.tv_sec = usec_timeout / 1000000; | |
150 | tval.tv_usec = usec_timeout % 1000000; | |
151 | } | |
152 | ||
153 | if(select (FD_SETSIZE, &active_fd_set, NULL, NULL, timeout_ptr) > 0) | |
154 | return true; | |
155 | else | |
156 | return false; | |
157 | } | |
158 | ||
94247295 GE |
159 | /** @brief read data from the raw socket and copy it into the provided buffer |
160 | @param buffer the buffer where to append the new data | |
161 | @param usec_timeout wait until new data is found, max timeout usecs. | |
162 | -1: wait endless | |
163 | NULL: no timeout | |
164 | */ | |
a11e19b7 GE |
165 | bool socket_handler::fill_buffer(std::string& buffer, long long usec_timeout) |
166 | { | |
07e98688 GE |
167 | // fast path for timeout==0 |
168 | if (usec_timeout==0 || data_waiting(usec_timeout)) | |
a11e19b7 GE |
169 | return fill_buffer(buffer); |
170 | else | |
171 | return false; | |
172 | } | |
173 | ||
94247295 GE |
174 | /** @brief read data from the raw socket and copy it into the provided buffer. Returns |
175 | instantly if no data is waiting. | |
176 | @param buffer the buffer where to append the new data | |
177 | */ | |
a11e19b7 GE |
178 | bool socket_handler::fill_buffer(std::string& buffer) |
179 | { | |
180 | bool try_again=false; | |
181 | ||
182 | char socket_buffer[recv_buffer_size]; | |
183 | ||
184 | int nbytes = read (sock, socket_buffer, recv_buffer_size); | |
185 | if (nbytes < 0) | |
186 | { | |
187 | if (errno == EAGAIN) | |
188 | return false; // no data was waiting | |
189 | else if (errno == EINTR) | |
190 | { | |
191 | // interrupted, try again | |
192 | try_again=true; | |
193 | } | |
194 | else | |
195 | { | |
196 | log(error,string("error reading from socket : ")+strerror(errno)); | |
197 | // TODO: exception? | |
198 | return false; | |
199 | } | |
200 | } | |
201 | ||
202 | // End-of-file | |
203 | if (nbytes == 0 && !try_again) | |
204 | { | |
205 | close(); | |
206 | return false; | |
207 | } | |
208 | ||
209 | // Data read -> store it | |
210 | if (nbytes > 0) | |
211 | buffer.assign(socket_buffer,nbytes); | |
212 | ||
213 | // more data waiting -> recurse | |
07e98688 | 214 | if (data_waiting(0)) |
a11e19b7 GE |
215 | fill_buffer(buffer); |
216 | ||
217 | if (nbytes > 0) | |
218 | return true; | |
219 | else | |
220 | return false; | |
221 | } | |
222 | ||
94247295 GE |
223 | /// writes raw data to the socket. Don't use directly, use the write() function provided by the |
224 | /// connection because it encapsulates the data. | |
644c4d26 | 225 | void socket_handler::socket_write(const std::string& data) |
a11e19b7 GE |
226 | { |
227 | int offset = 0; | |
228 | while (offset < data.size()) | |
229 | { | |
230 | unsigned int write_size=write_block_size; | |
231 | ||
232 | if (offset+write_size > data.size()) | |
233 | write_size = data.size()-offset; | |
234 | ||
235 | int rtn; | |
236 | while ((rtn=::write(sock, data.data()+offset, write_size)) && | |
237 | rtn == -1 && (errno == EAGAIN || errno == EINTR)) | |
238 | { | |
239 | usleep (80000); | |
240 | log(debug,"resuming write() call after EAGAIN or EINTR"); | |
241 | } | |
242 | ||
243 | if (rtn == -1) | |
244 | { | |
245 | log(error,string("write() returned ")+strerror(errno)); | |
246 | // TODO: exception? | |
247 | return; | |
248 | } | |
249 | else if (rtn != write_size) | |
250 | { | |
251 | ostringstream msg; | |
252 | msg << "write() wrote " << rtn << " bytes, should have been " | |
253 | << write_size << " (complete: " << data.size() << ")"; | |
254 | ||
255 | log(error,msg.str()); | |
256 | ||
257 | // TODO: exception? | |
258 | return; | |
259 | } | |
260 | ||
261 | offset += write_size; | |
262 | } | |
263 | ||
264 | return; | |
265 | } | |
266 | ||
267 | } |