NetUtils.h

Go to the documentation of this file.
00001 /*
00002  * IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. By
00003  * downloading, copying, installing or using the software you agree to
00004  * this license. If you do not agree to this license, do not download,
00005  * install, copy or use the software.
00006  * 
00007  * Intel Open Source License 
00008  * 
00009  * Copyright (c) 2004 Intel Corporation. All rights reserved. 
00010  * 
00011  * Redistribution and use in source and binary forms, with or without
00012  * modification, are permitted provided that the following conditions are
00013  * met:
00014  * 
00015  *   Redistributions of source code must retain the above copyright
00016  *   notice, this list of conditions and the following disclaimer.
00017  * 
00018  *   Redistributions in binary form must reproduce the above copyright
00019  *   notice, this list of conditions and the following disclaimer in the
00020  *   documentation and/or other materials provided with the distribution.
00021  * 
00022  *   Neither the name of the Intel Corporation nor the names of its
00023  *   contributors may be used to endorse or promote products derived from
00024  *   this software without specific prior written permission.
00025  *  
00026  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00027  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00028  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00029  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INTEL OR
00030  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00031  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00032  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00033  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00034  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00035  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00036  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00037  */
00038 
00039 #ifndef _OASYS_NET_UTILS_H_
00040 #define _OASYS_NET_UTILS_H_
00041 
00042 #include <string.h>
00043 #include <sys/types.h>
00044 #include <sys/socket.h>
00045 #include <netinet/in.h>
00046 #include <arpa/inet.h>
00047 #include "../compat/inttypes.h"
00048 
00054 #define intoa(addr) oasys::Intoa(addr).buf()
00055 
00056 namespace oasys {
00057 
00061 extern const char* _intoa(u_int32_t addr, char* buf, size_t bufsize);
00062 
00067 class Intoa {
00068 public:
00069     Intoa(in_addr_t addr) {
00070         str_ = _intoa(addr, buf_, bufsize_);
00071     }
00072     
00073     ~Intoa() {
00074         buf_[0] = '\0';
00075     }
00076     
00077     const char* buf() { return str_; }
00078 
00079     static const int bufsize_ = sizeof(".xxx.xxx.xxx.xxx");
00080     
00081 protected:
00082     char buf_[bufsize_];
00083     const char* str_;
00084 };
00085 
00089 extern int gethostbyname(const char* name, in_addr_t* addrp);
00090 
00091 /*
00092  * Various overrides of {ntoh,hton}{l,s} that take a char buffer,
00093  * which can be used on systems that require alignment for integer
00094  * operations.
00095  */
00096 
00097 inline u_int32_t
00098 safe_ntohl(const char* bp)
00099 {
00100     u_int32_t netval;
00101     memcpy(&netval, bp, sizeof(netval));
00102     return ntohl(netval);
00103 }
00104 
00105 inline u_int16_t
00106 safe_ntohs(const char* bp)
00107 {
00108     u_int16_t netval;
00109     memcpy(&netval, bp, sizeof(netval));
00110     return ntohs(netval);
00111 }
00112 
00113 inline void
00114 safe_htonl(u_int32_t val, char* bp)
00115 {
00116     val = htonl(val);
00117     memcpy(bp, &val, sizeof(val));
00118 }
00119     
00120 inline void
00121 safe_htons(u_int16_t val, char* bp)
00122 {
00123     val = htons(val);
00124     memcpy(bp, &val, sizeof(val));
00125 }
00126 
00127 
00128 } // namespace oasys
00129 
00130 #endif /* _OASYS_NET_UTILS_H_ */

Generated on Fri Dec 22 14:47:59 2006 for DTN Reference Implementation by  doxygen 1.5.1