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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> | |
37 | ||
38 | #include "socket_handler.hxx" | |
39 | #include "t2n_exception.hxx" | |
40 | ||
41 | using namespace std; | |
42 | ||
43 | namespace libt2n | |
44 | { | |
45 | ||
46 | void socket_handler::set_socket_options(int sock) | |
47 | { | |
48 | int i=1; | |
49 | ||
50 | /* fast reuse enable */ | |
51 | if (setsockopt(sock,SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i)) < 0) | |
52 | { | |
53 | string err="error setting socket option: "; | |
54 | err+=strerror(errno); | |
55 | log(error, err); | |
56 | throw t2n_communication_error(err); | |
57 | } | |
58 | ||
59 | /* keepalive enable */ | |
60 | if (setsockopt(sock,SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i)) < 0) | |
61 | { | |
62 | string err="error setting socket option: "; | |
63 | err+=strerror(errno); | |
64 | log(error, err); | |
65 | throw t2n_communication_error(err); | |
66 | } | |
67 | ||
68 | /* close on exec */ | |
69 | int fdflags; | |
70 | fdflags=fcntl(sock,F_GETFD, 0); | |
71 | if (fdflags < 0) | |
72 | { | |
73 | string err="fcntl error on socket: "; | |
74 | err+=strerror(errno); | |
75 | log(error, err); | |
76 | throw t2n_communication_error(err); | |
77 | } | |
78 | fdflags |= FD_CLOEXEC; | |
79 | if (fcntl(sock,F_SETFD,fdflags) < 0) | |
80 | { | |
81 | string err="fcntl error on socket: "; | |
82 | err+=strerror(errno); | |
83 | log(error, err); | |
84 | throw t2n_communication_error(err); | |
85 | } | |
86 | ||
87 | /* non-blocking mode */ | |
88 | int flflags; | |
89 | flflags=fcntl(sock,F_GETFL,0); | |
90 | if (flflags < 0) | |
91 | { | |
92 | string err="fcntl error on socket: "; | |
93 | err+=strerror(errno); | |
94 | log(error, err); | |
95 | throw t2n_communication_error(err); | |
96 | } | |
97 | flflags |= O_NONBLOCK; | |
98 | if (fcntl(sock,F_SETFL,flflags) < 0) | |
99 | { | |
100 | string err="fcntl error on socket: "; | |
101 | err+=strerror(errno); | |
102 | log(error, err); | |
103 | throw t2n_communication_error(err); | |
104 | } | |
105 | } | |
106 | ||
107 | void socket_handler::close() | |
108 | { | |
109 | ::close(sock); | |
110 | } | |
111 | ||
112 | bool socket_handler::data_waiting(long long usec_timeout) | |
113 | { | |
114 | // just our socket | |
115 | fd_set active_fd_set; | |
116 | FD_ZERO (&active_fd_set); | |
117 | FD_SET (sock, &active_fd_set); | |
118 | ||
119 | /* set timeout */ | |
120 | struct timeval tval; | |
121 | struct timeval *timeout_ptr; | |
122 | ||
123 | if (usec_timeout == -1) | |
124 | timeout_ptr = NULL; | |
125 | else | |
126 | { | |
127 | timeout_ptr = &tval; | |
128 | ||
129 | // timeout von long long usec in int sec + int usec umrechnen | |
130 | tval.tv_sec = usec_timeout / 1000000; | |
131 | tval.tv_usec = usec_timeout % 1000000; | |
132 | } | |
133 | ||
134 | if(select (FD_SETSIZE, &active_fd_set, NULL, NULL, timeout_ptr) > 0) | |
135 | return true; | |
136 | else | |
137 | return false; | |
138 | } | |
139 | ||
140 | bool socket_handler::fill_buffer(std::string& buffer, long long usec_timeout) | |
141 | { | |
142 | // fast path for timeout==-1 | |
143 | if (usec_timeout==-1 || data_waiting(usec_timeout)) | |
144 | return fill_buffer(buffer); | |
145 | else | |
146 | return false; | |
147 | } | |
148 | ||
149 | bool socket_handler::fill_buffer(std::string& buffer) | |
150 | { | |
151 | bool try_again=false; | |
152 | ||
153 | char socket_buffer[recv_buffer_size]; | |
154 | ||
155 | int nbytes = read (sock, socket_buffer, recv_buffer_size); | |
156 | if (nbytes < 0) | |
157 | { | |
158 | if (errno == EAGAIN) | |
159 | return false; // no data was waiting | |
160 | else if (errno == EINTR) | |
161 | { | |
162 | // interrupted, try again | |
163 | try_again=true; | |
164 | } | |
165 | else | |
166 | { | |
167 | log(error,string("error reading from socket : ")+strerror(errno)); | |
168 | // TODO: exception? | |
169 | return false; | |
170 | } | |
171 | } | |
172 | ||
173 | // End-of-file | |
174 | if (nbytes == 0 && !try_again) | |
175 | { | |
176 | close(); | |
177 | return false; | |
178 | } | |
179 | ||
180 | // Data read -> store it | |
181 | if (nbytes > 0) | |
182 | buffer.assign(socket_buffer,nbytes); | |
183 | ||
184 | // more data waiting -> recurse | |
185 | if (data_waiting()) | |
186 | fill_buffer(buffer); | |
187 | ||
188 | if (nbytes > 0) | |
189 | return true; | |
190 | else | |
191 | return false; | |
192 | } | |
193 | ||
194 | void socket_handler::write(const std::string& data) | |
195 | { | |
196 | int offset = 0; | |
197 | while (offset < data.size()) | |
198 | { | |
199 | unsigned int write_size=write_block_size; | |
200 | ||
201 | if (offset+write_size > data.size()) | |
202 | write_size = data.size()-offset; | |
203 | ||
204 | int rtn; | |
205 | while ((rtn=::write(sock, data.data()+offset, write_size)) && | |
206 | rtn == -1 && (errno == EAGAIN || errno == EINTR)) | |
207 | { | |
208 | usleep (80000); | |
209 | log(debug,"resuming write() call after EAGAIN or EINTR"); | |
210 | } | |
211 | ||
212 | if (rtn == -1) | |
213 | { | |
214 | log(error,string("write() returned ")+strerror(errno)); | |
215 | // TODO: exception? | |
216 | return; | |
217 | } | |
218 | else if (rtn != write_size) | |
219 | { | |
220 | ostringstream msg; | |
221 | msg << "write() wrote " << rtn << " bytes, should have been " | |
222 | << write_size << " (complete: " << data.size() << ")"; | |
223 | ||
224 | log(error,msg.str()); | |
225 | ||
226 | // TODO: exception? | |
227 | return; | |
228 | } | |
229 | ||
230 | offset += write_size; | |
231 | } | |
232 | ||
233 | return; | |
234 | } | |
235 | ||
236 | } |