Linux 获取本机IP地址.doc

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。 program list: ? #include stdio.h#include stdlib.h#include string.h#include sys/socket.h#include netinet/in.h#include arpa/inet.h#include netdb.h#include sys/types.h#include net/if.h#include ifaddrs.h#include unistd.h????#include sys/stat.h??#include fcntl.h?????#include termios.h???#include errno.h????? ?int GetIP_v4_and_v6_linux(int family, char *address, int size){???struct ifaddrs *ifap0, *ifap;???char buf[NI_MAXHOST];???char *interface = eth0;???struct sockaddr_in *addr4;???struct sockaddr_in6 *addr6;???int ret;?????if( NULL == address )??????{?????????????return -1;?????????}??????if(getifaddrs(ifap0))??????{????????return -1;????????}????????for( ifap = ifap0; ifap != NULL; 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 = (struct sockaddr_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\n,address);//testing??????????????freeifaddrs(ifap0);??????????????return 0;?????????????}??????else break;???????????????????????????????}?????else if(AF_INET6 == ifap-ifa_addr-sa_family)????????{?????????addr6 = (struct sockaddr_in6 *)ifap-ifa_addr;?????????if(IN6_IS_ADDR_MULTICAST(addr6-sin6_addr))?????????????{ continue;?????????????}?????????if(IN6_IS_ADDR_LINKLOCAL(addr6-sin6_addr))?????????????{continue;?????????????}???????????if(IN6_IS_ADDR_LOOPBACK(addr6-