PolarSSL v1.2.5
net.c
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1 /*
2  * TCP networking functions
3  *
4  * Copyright (C) 2006-2010, Brainspark B.V.
5  *
6  * This file is part of PolarSSL (http://www.polarssl.org)
7  * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
8  *
9  * All rights reserved.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License along
22  * with this program; if not, write to the Free Software Foundation, Inc.,
23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24  */
25 
26 #include "polarssl/config.h"
27 
28 #if defined(POLARSSL_NET_C)
29 
30 #include "polarssl/net.h"
31 
32 #if defined(_WIN32) || defined(_WIN32_WCE)
33 
34 #include <winsock2.h>
35 #include <windows.h>
36 
37 #if defined(_WIN32_WCE)
38 #pragma comment( lib, "ws2.lib" )
39 #else
40 #pragma comment( lib, "ws2_32.lib" )
41 #endif
42 
43 #define read(fd,buf,len) recv(fd,(char*)buf,(int) len,0)
44 #define write(fd,buf,len) send(fd,(char*)buf,(int) len,0)
45 #define close(fd) closesocket(fd)
46 
47 static int wsa_init_done = 0;
48 
49 #else
50 
51 #include <sys/types.h>
52 #include <sys/socket.h>
53 #include <netinet/in.h>
54 #include <arpa/inet.h>
55 #include <sys/time.h>
56 #include <unistd.h>
57 #include <signal.h>
58 #include <fcntl.h>
59 #include <netdb.h>
60 #include <errno.h>
61 
62 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || \
63  defined(__DragonflyBSD__)
64 #include <sys/endian.h>
65 #elif defined(__APPLE__)
66 #include <machine/endian.h>
67 #elif defined(sun)
68 #include <sys/isa_defs.h>
69 #else
70 #include <endian.h>
71 #endif
72 
73 #endif
74 
75 #include <stdlib.h>
76 #include <stdio.h>
77 #include <time.h>
78 
79 #ifdef _MSC_VER
80 #include <basetsd.h>
81 typedef UINT32 uint32_t;
82 #else
83 #include <inttypes.h>
84 #endif
85 
86 /*
87  * htons() is not always available.
88  * By default go for LITTLE_ENDIAN variant. Otherwise hope for _BYTE_ORDER and __BIG_ENDIAN
89  * to help determine endianess.
90  */
91 #if defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && __BYTE_ORDER == __BIG_ENDIAN
92 #define POLARSSL_HTONS(n) (n)
93 #else
94 #define POLARSSL_HTONS(n) (((((unsigned short)(n) & 0xFF)) << 8) | (((unsigned short)(n) & 0xFF00) >> 8))
95 #endif
96 
97 unsigned short net_htons(unsigned short n);
98 #define net_htons(n) POLARSSL_HTONS(n)
99 
100 /*
101  * Initiate a TCP connection with host:port
102  */
103 int net_connect( int *fd, const char *host, int port )
104 {
105  struct sockaddr_in server_addr;
106  struct hostent *server_host;
107 
108 #if defined(_WIN32) || defined(_WIN32_WCE)
109  WSADATA wsaData;
110 
111  if( wsa_init_done == 0 )
112  {
113  if( WSAStartup( MAKEWORD(2,0), &wsaData ) == SOCKET_ERROR )
115 
116  wsa_init_done = 1;
117  }
118 #else
119  signal( SIGPIPE, SIG_IGN );
120 #endif
121 
122  if( ( server_host = gethostbyname( host ) ) == NULL )
124 
125  if( ( *fd = socket( AF_INET, SOCK_STREAM, IPPROTO_IP ) ) < 0 )
127 
128  memcpy( (void *) &server_addr.sin_addr,
129  (void *) server_host->h_addr,
130  server_host->h_length );
131 
132  server_addr.sin_family = AF_INET;
133  server_addr.sin_port = net_htons( port );
134 
135  if( connect( *fd, (struct sockaddr *) &server_addr,
136  sizeof( server_addr ) ) < 0 )
137  {
138  close( *fd );
140  }
141 
142  return( 0 );
143 }
144 
145 /*
146  * Create a listening socket on bind_ip:port
147  */
148 int net_bind( int *fd, const char *bind_ip, int port )
149 {
150  int n, c[4];
151  struct sockaddr_in server_addr;
152 
153 #if defined(_WIN32) || defined(_WIN32_WCE)
154  WSADATA wsaData;
155 
156  if( wsa_init_done == 0 )
157  {
158  if( WSAStartup( MAKEWORD(2,0), &wsaData ) == SOCKET_ERROR )
160 
161  wsa_init_done = 1;
162  }
163 #else
164  signal( SIGPIPE, SIG_IGN );
165 #endif
166 
167  if( ( *fd = socket( AF_INET, SOCK_STREAM, IPPROTO_IP ) ) < 0 )
169 
170  n = 1;
171  setsockopt( *fd, SOL_SOCKET, SO_REUSEADDR,
172  (const char *) &n, sizeof( n ) );
173 
174  server_addr.sin_addr.s_addr = INADDR_ANY;
175  server_addr.sin_family = AF_INET;
176  server_addr.sin_port = net_htons( port );
177 
178  if( bind_ip != NULL )
179  {
180  memset( c, 0, sizeof( c ) );
181  sscanf( bind_ip, "%d.%d.%d.%d", &c[0], &c[1], &c[2], &c[3] );
182 
183  for( n = 0; n < 4; n++ )
184  if( c[n] < 0 || c[n] > 255 )
185  break;
186 
187  if( n == 4 )
188  server_addr.sin_addr.s_addr =
189  ( (uint32_t) c[0] << 24 ) |
190  ( (uint32_t) c[1] << 16 ) |
191  ( (uint32_t) c[2] << 8 ) |
192  ( (uint32_t) c[3] );
193  }
194 
195  if( bind( *fd, (struct sockaddr *) &server_addr,
196  sizeof( server_addr ) ) < 0 )
197  {
198  close( *fd );
200  }
201 
202  if( listen( *fd, POLARSSL_NET_LISTEN_BACKLOG ) != 0 )
203  {
204  close( *fd );
206  }
207 
208  return( 0 );
209 }
210 
211 /*
212  * Check if the current operation is blocking
213  */
214 static int net_is_blocking( void )
215 {
216 #if defined(_WIN32) || defined(_WIN32_WCE)
217  return( WSAGetLastError() == WSAEWOULDBLOCK );
218 #else
219  switch( errno )
220  {
221 #if defined EAGAIN
222  case EAGAIN:
223 #endif
224 #if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
225  case EWOULDBLOCK:
226 #endif
227  return( 1 );
228  }
229  return( 0 );
230 #endif
231 }
232 
233 /*
234  * Accept a connection from a remote client
235  */
236 int net_accept( int bind_fd, int *client_fd, void *client_ip )
237 {
238  struct sockaddr_in client_addr;
239 
240 #if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
241  defined(_SOCKLEN_T_DECLARED)
242  socklen_t n = (socklen_t) sizeof( client_addr );
243 #else
244  int n = (int) sizeof( client_addr );
245 #endif
246 
247  *client_fd = accept( bind_fd, (struct sockaddr *)
248  &client_addr, &n );
249 
250  if( *client_fd < 0 )
251  {
252  if( net_is_blocking() != 0 )
253  return( POLARSSL_ERR_NET_WANT_READ );
254 
256  }
257 
258  if( client_ip != NULL )
259  memcpy( client_ip, &client_addr.sin_addr.s_addr,
260  sizeof( client_addr.sin_addr.s_addr ) );
261 
262  return( 0 );
263 }
264 
265 /*
266  * Set the socket blocking or non-blocking
267  */
268 int net_set_block( int fd )
269 {
270 #if defined(_WIN32) || defined(_WIN32_WCE)
271  u_long n = 0;
272  return( ioctlsocket( fd, FIONBIO, &n ) );
273 #else
274  return( fcntl( fd, F_SETFL, fcntl( fd, F_GETFL ) & ~O_NONBLOCK ) );
275 #endif
276 }
277 
278 int net_set_nonblock( int fd )
279 {
280 #if defined(_WIN32) || defined(_WIN32_WCE)
281  u_long n = 1;
282  return( ioctlsocket( fd, FIONBIO, &n ) );
283 #else
284  return( fcntl( fd, F_SETFL, fcntl( fd, F_GETFL ) | O_NONBLOCK ) );
285 #endif
286 }
287 
288 /*
289  * Portable usleep helper
290  */
291 void net_usleep( unsigned long usec )
292 {
293  struct timeval tv;
294  tv.tv_sec = 0;
295  tv.tv_usec = usec;
296  select( 0, NULL, NULL, NULL, &tv );
297 }
298 
299 /*
300  * Read at most 'len' characters
301  */
302 int net_recv( void *ctx, unsigned char *buf, size_t len )
303 {
304  int ret = read( *((int *) ctx), buf, len );
305 
306  if( ret < 0 )
307  {
308  if( net_is_blocking() != 0 )
309  return( POLARSSL_ERR_NET_WANT_READ );
310 
311 #if defined(_WIN32) || defined(_WIN32_WCE)
312  if( WSAGetLastError() == WSAECONNRESET )
313  return( POLARSSL_ERR_NET_CONN_RESET );
314 #else
315  if( errno == EPIPE || errno == ECONNRESET )
316  return( POLARSSL_ERR_NET_CONN_RESET );
317 
318  if( errno == EINTR )
319  return( POLARSSL_ERR_NET_WANT_READ );
320 #endif
321 
323  }
324 
325  return( ret );
326 }
327 
328 /*
329  * Write at most 'len' characters
330  */
331 int net_send( void *ctx, const unsigned char *buf, size_t len )
332 {
333  int ret = write( *((int *) ctx), buf, len );
334 
335  if( ret < 0 )
336  {
337  if( net_is_blocking() != 0 )
338  return( POLARSSL_ERR_NET_WANT_WRITE );
339 
340 #if defined(_WIN32) || defined(_WIN32_WCE)
341  if( WSAGetLastError() == WSAECONNRESET )
342  return( POLARSSL_ERR_NET_CONN_RESET );
343 #else
344  if( errno == EPIPE || errno == ECONNRESET )
345  return( POLARSSL_ERR_NET_CONN_RESET );
346 
347  if( errno == EINTR )
348  return( POLARSSL_ERR_NET_WANT_WRITE );
349 #endif
350 
352  }
353 
354  return( ret );
355 }
356 
357 /*
358  * Gracefully close the connection
359  */
360 void net_close( int fd )
361 {
362  shutdown( fd, 2 );
363  close( fd );
364 }
365 
366 #endif