C 从ip和子网掩码计算广播地址
我要计算以下各项的广播地址:C 从ip和子网掩码计算广播地址,c,ip,broadcast,subnet,C,Ip,Broadcast,Subnet,我要计算以下各项的广播地址: IP: 192.168.3.1 Subnet: 255.255.255.0 = 192.168.3.255 在C 我知道这条路(在反向IP和子网之间做奇妙的按位OR),但我的问题是我来自MacOSX Cocoa编程的绿色领域 我查看了ipcal的源代码,但未能将其集成到我的代码库中。互联网上一定有十行简单的代码,我就是找不到。 有人能给我举一个简短的代码示例,说明如何在C语言中实现这一点吗?只需计算一下: broadcast = ip | (
IP: 192.168.3.1
Subnet: 255.255.255.0
= 192.168.3.255
在C
我知道这条路(在反向IP和子网之间做奇妙的按位OR),但我的问题是我来自MacOSX Cocoa编程的绿色领域
我查看了ipcal的源代码,但未能将其集成到我的代码库中。互联网上一定有十行简单的代码,我就是找不到。
有人能给我举一个简短的代码示例,说明如何在C语言中实现这一点吗?只需计算一下:
broadcast = ip | ( ~ subnet )
(广播=ip地址或反向子网掩码)
广播地址有一个1
位,而子网掩码有一个0
位。可能是吗
unsigned broadcast(unsigned ip,unsigned subnet){
unsigned int bits = subnet ^ 0xffffffff;
unsigned int bcast = ip | bits;
return bcast;
}
编辑:我认为ip和子网都没有“.”以下是如何在C#中做到这一点。例如,将ip 10.28.40.149与网络掩码255.255.252.0一起使用会返回10.28.43.255,这是正确的广播地址。多亏了来自
私有静态字符串GetBroadcastAddress(字符串ipAddress,字符串子网掩码){
//从ip和子网确定广播地址
var ip=IPAddress.Parse(IPAddress);
var mask=IPAddress.Parse(子网掩码);
字节[]ipAdressBytes=ip.GetAddressBytes();
byte[]subnetMaskBytes=mask.GetAddressBytes();
if(ipAdressBytes.Length!=subnetMaskBytes.Length)
抛出新ArgumentException(“IP地址和子网掩码的长度不匹配”);
byte[]broadcastAddress=新字节[ipAdressBytes.Length];
for(int i=0;i
据我所知,OP对位级算术至少有一点模糊的理解,但在将字符串转换为数字及其倒数时迷失了方向。下面是一个使用froh42计算的工作(无论如何,测试最少)示例
jcomeau@aspire:~/rentacoder/jcomeau/freifunk$ cat inet.c; make inet; ./inet 192.168.3.1 255.255.255.0
#include <arpa/inet.h>
#include <stdio.h>
int main(int argc, char **argv) {
char *host_ip = argc > 1 ? argv[1] : "127.0.0.1";
char *netmask = argc > 2 ? argv[2] : "255.255.255.255";
struct in_addr host, mask, broadcast;
char broadcast_address[INET_ADDRSTRLEN];
if (inet_pton(AF_INET, host_ip, &host) == 1 &&
inet_pton(AF_INET, netmask, &mask) == 1)
broadcast.s_addr = host.s_addr | ~mask.s_addr;
else {
fprintf(stderr, "Failed converting strings to numbers\n");
return 1;
}
if (inet_ntop(AF_INET, &broadcast, broadcast_address, INET_ADDRSTRLEN) != NULL)
printf("Broadcast address of %s with netmask %s is %s\n",
host_ip, netmask, broadcast_address);
else {
fprintf(stderr, "Failed converting number to string\n");
return 1;
}
return 0;
}
cc inet.c -o inet
Broadcast address of 192.168.3.1 with netmask 255.255.255.0 is 192.168.3.255
jcomeau@aspire:~/rentacoder/jcomeau/freifunk$cat inet.c;制作inet/inet 192.168.3.1 255.255.255.0
#包括
#包括
int main(int argc,字符**argv){
char*host_ip=argc>1?argv[1]:“127.0.0.1”;
char*netmask=argc>2?argv[2]:“255.255.255.255”;
结构地址主机、掩码、广播;
字符广播地址[INET_ADDRSTRLEN];
if(inet\u pton(AF\u inet、host\u ip和host)==1&&
inet\u pton(AF\u inet、网络掩码和掩码)==1)
broadcast.s_addr=host.s_addr | ~mask.s_addr;
否则{
fprintf(stderr,“将字符串转换为数字失败\n”);
返回1;
}
if(inet\u ntop(AF\u inet,&broadcast,broadcast\u地址,inet\u ADDRSTRLEN)!=NULL)
printf(“网络掩码为%s的%s的广播地址为%s\n”,
主机ip、网络掩码、广播地址);
否则{
fprintf(stderr,“将数字转换为字符串失败\n”);
返回1;
}
返回0;
}
cc inet.c-o inet
网络掩码为255.255.255.0的192.168.3.1的广播地址为192.168.3.255
好的,将来谁来查找此代码。我今天花了一些时间,因为我需要这个,这里是完整的代码,它可以工作:)只需复制和粘贴它,然后导入所需的DLL
private IPAddress CalculateBroadCastAddress(IPAddress currentIP, IPAddress ipNetMask)
{
string[] strCurrentIP = currentIP.ToString().Split('.');
string[] strIPNetMask = ipNetMask.ToString().Split('.');
ArrayList arBroadCast = new ArrayList();
for (int i = 0; i < 4; i++)
{
int nrBCOct = int.Parse(strCurrentIP[i]) | (int.Parse(strIPNetMask[i]) ^ 255);
arBroadCast.Add(nrBCOct.ToString());
}
return IPAddress.Parse(arBroadCast[0] + "." + arBroadCast[1] +
"." + arBroadCast[2] + "." + arBroadCast[3]);
}
private IPAddress getIP()
{
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
return ip;
}
}
return null;
}
private IPAddress getSubnetMask()
{
NetworkInterface[] Interfaces = NetworkInterface.GetAllNetworkInterfaces();
IPAddress ip = getIP();
foreach (NetworkInterface interf in Interfaces)
{
UnicastIPAddressInformationCollection UnicastIPInfoCol = interf.GetIPProperties().UnicastAddresses;
foreach (UnicastIPAddressInformation UnicatIPInfo in UnicastIPInfoCol)
{
if (UnicatIPInfo.Address.Equals(ip))
return UnicatIPInfo.IPv4Mask;
}
}
return null;
}
快乐编码:)这不是C语言
private IPAddress CalculateBroadCastAddress(IPAddress currentIP, IPAddress ipNetMask)
{
string[] strCurrentIP = currentIP.ToString().Split('.');
string[] strIPNetMask = ipNetMask.ToString().Split('.');
ArrayList arBroadCast = new ArrayList();
for (int i = 0; i < 4; i++)
{
int nrBCOct = int.Parse(strCurrentIP[i]) | (int.Parse(strIPNetMask[i]) ^ 255);
arBroadCast.Add(nrBCOct.ToString());
}
return IPAddress.Parse(arBroadCast[0] + "." + arBroadCast[1] +
"." + arBroadCast[2] + "." + arBroadCast[3]);
}
private IPAddress getIP()
{
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
return ip;
}
}
return null;
}
private IPAddress getSubnetMask()
{
NetworkInterface[] Interfaces = NetworkInterface.GetAllNetworkInterfaces();
IPAddress ip = getIP();
foreach (NetworkInterface interf in Interfaces)
{
UnicastIPAddressInformationCollection UnicastIPInfoCol = interf.GetIPProperties().UnicastAddresses;
foreach (UnicastIPAddressInformation UnicatIPInfo in UnicastIPInfoCol)
{
if (UnicatIPInfo.Address.Equals(ip))
return UnicatIPInfo.IPv4Mask;
}
}
return null;
}
IPAddress broadcastip = CalculateBroadCastAddress(getIP(), getSubnetMask());