Linux 获取本机IP地址

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1、IP地址分为IPv4和IPv6，本文只验证了IPv4的获取，至于IPv6还没有验证。 说明：family=AT_INET:IPv4family=AT_INET6:IPv6address:提取得到的IP地址所要保存的地址size=strlen(sampleIP)192.168.123.128       MAX_IPv4=15某些头文件应在其他方面，在本程序中没用得上。不过不影响程序的编译。programlist: #include#include#include#include#incl

2、ude#include#include#include#include#include#include    #include  #include     #include   #include      intGetIP_v4_and_v6_linux(intfamily,char*address,intsize){   struc

3、tifaddrs*ifap0,*ifap;   charbuf[NI_MAXHOST];   char*interface="eth0";   structsockaddr_in*addr4;   structsockaddr_in6*addr6;   intret;     if(NULL==address)      {             return-1;         }      if(getifaddrs(&ifap0))      {        return-1;        }        for(ifap=ifap0;ifap!=NULL

4、;ifap=ifap->ifa_next)     {      if(strcmp(interface,ifap->ifa_name)!=0)continue;      if(ifap->ifa_addr==NULL)continue;      if((ifap->ifa_flags&IFF_UP)==0)continue;      if(family!=ifap->ifa_addr->sa_family)continue;      if(AF_INET==ifap->ifa_addr->sa_family)       {        addr4=(stru

5、ctsockaddr_in*)ifap->ifa_addr;        if(NULL!=inet_ntop(ifap->ifa_addr->sa_family,              (void*)&(addr4->sin_addr),buf,NI_MAXHOST))             {              if(size  <  strlen(buf))break;              strcpy(address,buf);              printf("IPv4=%s",address);//testing       

6、       freeifaddrs(ifap0);              return0;             }      elsebreak;                               }     elseif(AF_INET6==ifap->ifa_addr->sa_family)        {         addr6=(structsockaddr_in6*)ifap->ifa_addr;         if(IN6_IS_ADDR_MULTICAST(&addr6->sin6_addr))             {cont

7、inue;             }         if(IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr))             {continue;             }           if(IN6_IS_ADDR_LOOPBACK(&addr6->sin6_addr))             {continue;             }         if(IN6_IS_ADDR_UNSPECIFIED(&addr6->sin6_addr))