linux下获取本机ip地址，ipv4和ipv6

来源：互联网发布：锦纶氨纶涤纶知乎编辑：程序博客网时间：2024/05/03 10:18
#include <stdio.h>#include <string.h>#include <sys/socket.h>#include <sys/types.h>#include <netdb.h>#include <net/if.h>#include <ifaddrs.h>#include <netinet/in.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);                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->sin6_addr)){                continue;            }            if(IN6_IS_ADDR_UNSPECIFIED(&addr6->sin6_addr)){                continue;            }            if(IN6_IS_ADDR_SITELOCAL(&addr6->sin6_addr)){                continue;            }            if ( NULL != inet_ntop(ifap->ifa_addr->sa_family,                     (void *)&(addr6->sin6_addr), buf, NI_MAXHOST) ){                if(size <= strlen(buf) ) break;                 strcpy(address, buf);                freeifaddrs(ifap0);                return 0;            }            else break;        }    }    freeifaddrs(ifap0);    return -1;}