C 链接层地址的inet_pton()对应项
我有两个与我的实现相关的问题-C 链接层地址的inet_pton()对应项,c,linux,sockets,networking,mac-address,C,Linux,Sockets,Networking,Mac Address,我有两个与我的实现相关的问题- 我需要一个函数,它可以将给定的链路层地址从文本转换为标准格式,就像我们在n/w层有一个类似的函数,用于IP地址inet\u pton(),它可以将给定的IP地址从文本转换为标准的IPv4/IPv6格式 链路层地址和48位mac地址有什么区别吗 (特别是在IPv6的情况下) 如果没有,那么链接层地址的长度也应该始终为48位,如果我没有错的话 提前谢谢。如果我遗漏了一些小事,请原谅 编辑: 好的。。我很清楚b/w链路层地址和以太网mac地址的区别。有几种类型的数据链路
inet\u pton()
,它可以将给定的IP地址从文本转换为标准的IPv4/IPv6格式RFC4861
中所述
Option Formats
Neighbor Discovery messages include zero or more options, some of
which may appear multiple times in the same message. Options should
be padded when necessary to ensure that they end on their natural
64-bit boundaries. All options are of the form:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fields:
Type 8-bit identifier of the type of option. The
options defined in this document are:
Option Name Type
Source Link-Layer Address 1
Target Link-Layer Address 2
Prefix Information 3
Redirected Header 4
MTU 5
Length 8-bit unsigned integer. The length of the option
(including the type and length fields) in units of
8 octets. The value 0 is invalid. Nodes MUST
silently discard an ND packet that contains an
option with length zero.
4.6.1. Source/Target Link-layer Address
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Link-Layer Address ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fields:
Type
1 for Source Link-layer Address
2 for Target Link-layer Address
Length The length of the option (including the type and
length fields) in units of 8 octets. For example,
the length for IEEE 802 addresses is 1
[IPv6-ETHER].
Link-Layer Address
The variable length link-layer address.
The content and format of this field (including
byte and bit ordering) is expected to be specified
in specific documents that describe how IPv6
operates over different link layers. For instance,
[IPv6-ETHER].
还有一点我不太喜欢C++,你能提供C语言吗?
谢谢。您的第一个问题,写起来并不难,而且由于MAC地址由一个6字节的数组表示,所以您不需要考虑机器依赖性(如endian ness等)
void str2MAC(字符串str,char*mac){
对于(inti=0;i你的第一个问题,写起来并不难,而且由于MAC地址由一个6字节的数组表示,你不需要考虑机器依赖性(比如endian ness之类的)
void str2MAC(字符串str,char*mac){
对于(int i=0;i第一个问题的可能重复是完全重复,您的第二个问题不是建设性的。您是在谈论IEEE 802的数据链路层?还是其他?第一个问题的可能重复是完全重复,您的第二个问题不是建设性的。您是在谈论IEEE 802的数据链路层?或者还有别的事吗?这取决于你的观点…但通常是相反的。这取决于你的观点…但通常是相反的。
void str2MAC(string str,char* mac) {
for(int i=0;i<5;i++) {
string b = str.substr(0,str.find(':'));
str = str.substr(str.find(':')+1);
mac[i] = 0;
for(int j=0;j<b.size();b++) {
mac[i] *= 0x10;
mac[i] += (b[j]>'9'?b[j]-'a'+10:b[j]-'0');
}
}
mac[5] = 0;
for(int i=0;i<str.size();i++) {
mac[5] *= 0x10;
mac[5] += (str[i]>'9'?str[i]-'a'+10:str[i]-'0');
}
}