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7087e187 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> | |
37 | ||
38 | #include "socket_client.hxx" | |
39 | #include "t2n_exception.hxx" | |
e1614a6d | 40 | #include "log.hxx" |
7087e187 GE |
41 | |
42 | using namespace std; | |
43 | ||
44 | namespace libt2n | |
45 | { | |
46 | ||
fb3345ad | 47 | /// returns a closed connection if connection could not be established, call get_last_error_msg() for details |
b604df5f | 48 | socket_client_connection::socket_client_connection(int _port, const std::string& _server, |
e1614a6d GE |
49 | long long _connect_timeout_usec, int _max_retries, |
50 | std::ostream *_logstream, log_level_values _log_level) | |
7087e187 GE |
51 | : client_connection(), socket_handler(0,tcp_s) |
52 | { | |
53 | max_retries=_max_retries; | |
b604df5f | 54 | connect_timeout_usec=_connect_timeout_usec; |
7087e187 GE |
55 | |
56 | server=_server; | |
57 | port=_port; | |
58 | ||
e1614a6d GE |
59 | set_logging(_logstream,_log_level); |
60 | ||
fb3345ad GE |
61 | try |
62 | { | |
63 | tcp_connect(max_retries); | |
64 | } | |
65 | catch (t2n_communication_error &e) | |
66 | { | |
67 | lastErrorMsg=e.what(); | |
68 | LOGSTREAM(debug,"tcp connect error: " << lastErrorMsg); | |
69 | close(); | |
70 | } | |
e1614a6d | 71 | |
fb3345ad GE |
72 | if (!connection::is_closed()) |
73 | do_callbacks(new_connection); | |
7087e187 GE |
74 | } |
75 | ||
fb3345ad | 76 | /// returns a closed connection if connection could not be established, call get_last_error_msg() for details |
b604df5f | 77 | socket_client_connection::socket_client_connection(const std::string& _path, |
e1614a6d GE |
78 | long long _connect_timeout_usec, int _max_retries, |
79 | std::ostream *_logstream, log_level_values _log_level) | |
7087e187 GE |
80 | : client_connection(), socket_handler(0,unix_s) |
81 | { | |
82 | max_retries=_max_retries; | |
b604df5f | 83 | connect_timeout_usec=_connect_timeout_usec; |
7087e187 GE |
84 | |
85 | path=_path; | |
86 | ||
e1614a6d GE |
87 | set_logging(_logstream,_log_level); |
88 | ||
fb3345ad GE |
89 | try |
90 | { | |
91 | unix_connect(max_retries); | |
92 | } | |
93 | catch (t2n_communication_error &e) | |
94 | { | |
95 | lastErrorMsg=e.what(); | |
96 | LOGSTREAM(debug,"unix connect error: " << lastErrorMsg); | |
97 | close(); | |
98 | } | |
e1614a6d | 99 | |
fb3345ad GE |
100 | if (!connection::is_closed()) |
101 | do_callbacks(new_connection); | |
7087e187 GE |
102 | } |
103 | ||
487afb79 | 104 | /// establish a connection via tcp |
b604df5f | 105 | void socket_client_connection::tcp_connect(int max_retries) |
7087e187 | 106 | { |
b604df5f GE |
107 | struct sockaddr_in sock_addr; |
108 | ||
109 | sock_addr.sin_family = AF_INET; | |
110 | sock_addr.sin_port = htons(port); | |
111 | ||
112 | // find the target ip | |
113 | if (inet_aton(server.c_str(),&sock_addr.sin_addr)==0) | |
7087e187 | 114 | { |
b604df5f GE |
115 | struct hostent *server_hent; |
116 | server_hent=gethostbyname(server.c_str()); | |
117 | if (server_hent == NULL) | |
118 | throw t2n_connect_error(string("can't find server ")+server); | |
7087e187 | 119 | |
b604df5f GE |
120 | memcpy(&sock_addr.sin_addr,server_hent->h_addr_list[0],sizeof(sock_addr.sin_addr)); |
121 | } | |
7087e187 | 122 | |
b604df5f GE |
123 | sock = socket(PF_INET, SOCK_STREAM, 0); |
124 | if (!sock) | |
125 | throw t2n_connect_error(string("socket() error: ")+strerror(errno)); | |
7087e187 | 126 | |
b604df5f GE |
127 | try |
128 | { | |
129 | connect_with_timeout((struct sockaddr *) &sock_addr,sizeof(sock_addr)); | |
7087e187 | 130 | } |
b604df5f | 131 | catch (t2n_connect_error &e) |
7087e187 | 132 | { |
b604df5f GE |
133 | // recurse if retries left |
134 | if (max_retries > 0) | |
e1614a6d GE |
135 | { |
136 | LOGSTREAM(debug,"retrying connect after connect error"); | |
b604df5f | 137 | tcp_connect(max_retries-1); |
e1614a6d GE |
138 | } |
139 | else | |
fb3345ad | 140 | throw t2n_connect_error("no more retries left after connect error"); |
b604df5f | 141 | } |
b604df5f | 142 | } |
7087e187 | 143 | |
487afb79 | 144 | /// establish a connection via unix-socket |
b604df5f GE |
145 | void socket_client_connection::unix_connect(int max_retries) |
146 | { | |
147 | struct sockaddr_un unix_addr; | |
7087e187 | 148 | |
b604df5f GE |
149 | unix_addr.sun_family = AF_UNIX; |
150 | strcpy (unix_addr.sun_path, path.c_str()); | |
7087e187 | 151 | |
b604df5f GE |
152 | sock = socket(PF_UNIX, SOCK_STREAM, 0); |
153 | if (!sock) | |
154 | throw t2n_connect_error(string("socket() error: ")+strerror(errno)); | |
7087e187 | 155 | |
b604df5f GE |
156 | try |
157 | { | |
158 | connect_with_timeout((struct sockaddr *) &unix_addr, sizeof(unix_addr)); | |
159 | } | |
160 | catch (t2n_connect_error &e) | |
161 | { | |
162 | // recurse if retries left | |
163 | if (max_retries > 0) | |
e1614a6d GE |
164 | { |
165 | LOGSTREAM(debug,"retrying connect after connect error"); | |
5b71156f | 166 | unix_connect(max_retries-1); |
e1614a6d GE |
167 | } |
168 | else | |
fb3345ad | 169 | throw t2n_connect_error("no more retries left after connect error"); |
7087e187 | 170 | } |
b604df5f GE |
171 | } |
172 | ||
487afb79 | 173 | /// execute a connect on a prepared socket (tcp or unix) respecting timeouts |
b604df5f GE |
174 | void socket_client_connection::connect_with_timeout(struct sockaddr *sock_addr,unsigned int sockaddr_size) |
175 | { | |
7087e187 | 176 | set_socket_options(sock); |
91730468 | 177 | |
039e52da GE |
178 | /* non-blocking mode */ |
179 | int flflags; | |
180 | flflags=fcntl(sock,F_GETFL,0); | |
181 | if (flflags < 0) | |
182 | EXCEPTIONSTREAM(error,t2n_communication_error,"fcntl error on socket: " << strerror(errno)); | |
183 | ||
184 | flflags &= (O_NONBLOCK ^ 0xFFFF); | |
185 | if (fcntl(sock,F_SETFL,flflags) < 0) | |
186 | EXCEPTIONSTREAM(error,t2n_communication_error,"fcntl error on socket: " << strerror(errno)); | |
187 | ||
188 | ||
e1614a6d | 189 | LOGSTREAM(debug,"connect_with_timeout()"); |
b604df5f GE |
190 | int ret=::connect(sock,sock_addr, sockaddr_size); |
191 | ||
192 | if (ret < 0) | |
193 | { | |
194 | if (errno==EINPROGRESS) | |
195 | { | |
e1614a6d GE |
196 | LOGSTREAM(debug,"connect_with_timeout(): EINPROGRESS"); |
197 | ||
b604df5f GE |
198 | /* set timeout */ |
199 | struct timeval tval; | |
200 | struct timeval *timeout_ptr; | |
201 | ||
202 | if (connect_timeout_usec == -1) | |
203 | timeout_ptr = NULL; | |
204 | else | |
205 | { | |
206 | timeout_ptr = &tval; | |
207 | ||
208 | // convert timeout from long long usec to int sec + int usec | |
209 | tval.tv_sec = connect_timeout_usec / 1000000; | |
210 | tval.tv_usec = connect_timeout_usec % 1000000; | |
211 | } | |
212 | ||
213 | fd_set connect_socket_set; | |
214 | FD_ZERO(&connect_socket_set); | |
215 | FD_SET(sock,&connect_socket_set); | |
216 | ||
217 | int ret; | |
218 | while ((ret=select(FD_SETSIZE, NULL, &connect_socket_set, NULL, timeout_ptr)) && | |
219 | ret < 0 && errno==EINTR); | |
220 | ||
221 | if (ret < 0) | |
222 | throw t2n_connect_error(string("connect() error (select): ")+strerror(errno)); | |
223 | ||
224 | socklen_t sopt=sizeof(int); | |
225 | int valopt; | |
226 | ret=getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)(&valopt), &sopt); | |
227 | if (ret < 0 || valopt) | |
228 | throw t2n_connect_error(string("connect() error (getsockopt): ")+strerror(errno)); | |
229 | } | |
230 | else | |
231 | throw t2n_connect_error(string("connect() error: ")+strerror(errno)); | |
232 | } | |
e1614a6d GE |
233 | |
234 | LOGSTREAM(debug,"connect_with_timeout(): success"); | |
7087e187 GE |
235 | } |
236 | ||
237 | void socket_client_connection::close() | |
238 | { | |
239 | if (!client_connection::is_closed()) | |
240 | { | |
241 | socket_handler::close(); | |
242 | client_connection::close(); | |
243 | } | |
244 | } | |
245 | ||
af84dfb5 | 246 | /** @brief try to reconnect the current connection with the same connection credentials (host and port or path) |
fb3345ad GE |
247 | |
248 | @note will throw an exeption if reconnecting not possible | |
af84dfb5 GE |
249 | */ |
250 | void socket_client_connection::reconnect() | |
251 | { | |
e1614a6d GE |
252 | LOGSTREAM(debug,"reconnect()"); |
253 | ||
af84dfb5 GE |
254 | // close the current connection if still open |
255 | close(); | |
256 | ||
257 | socket_type_value type=get_type(); | |
258 | ||
259 | if (type == tcp_s) | |
260 | tcp_connect(max_retries); | |
261 | else if (type == unix_s) | |
262 | unix_connect(max_retries); | |
263 | ||
fb3345ad | 264 | // connection is open now, otherwise an execption would have been thrown |
af84dfb5 | 265 | reopen(); |
e1614a6d GE |
266 | |
267 | LOGSTREAM(debug,"reconnect() done, client_connection::is_closed() now " << client_connection::is_closed()); | |
af84dfb5 GE |
268 | } |
269 | ||
7087e187 | 270 | } |