几种获取本机IPv6地址的方法

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如同获取IPv4的地址一般，获取IPv6也是可以通过使用网卡信息来得到IPv6的地址，也可以给一个多播地址发送数据包然后获取IPv6的地址。在IPv4通过iotcl函数是可以获取本主机的IPv4的地址的，但是本楼主使用iotcl函数来获取IPv6的地址就没成功过，经查证，没有看到使用iotcl获取IPv6地址成功的Demo,所以如果想使用iocl函数来获取IPv6地址，我劝你还是做好心理准备哈！不多说，直接上代码了，一下就是我实现的两种获取IPv6地址的方法。

mynet.h

#include  <netinet/in.h>#include  <sys/param.h>#include  <sys/stat.h>#include  <sys/ioctl.h>#include  <sys/socket.h>#include  <sys/socket.h>#include  <sys/time.h>#include  <sys/file.h>#include  <sys/types.h>#include   <netinet/ip.h>#include  <arpa/ftp.h>#include  <arpa/inet.h>#include  <arpa/telnet.h> #include  <stdio.h>#include  <signal.h>#include  <string.h>#include  <net/if.h>#include  <stdlib.h>#include  <unistd.h>#include  <error.h>#include  <netdb.h>#include  <ifaddrs.h> #include  <errno.h>

方法一:byeth0getipv6.c

#include "mynet.h"      int  main(int argc, char *argv[]){          struct ifaddrs *ifaddr, *ifa;          int family, s;          char host[NI_MAXHOST];  char* ifaname;     printf("NI_MAXHOST:%d\n",NI_MAXHOST);         if (getifaddrs(&ifaddr) == -1) {              printf("getifaddrs\n");              return -1;          }                for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {              if (ifa->ifa_addr == NULL)                  continue;                    family = ifa->ifa_addr->sa_family;              ifaname = ifa->ifa_name;             if (family == AF_INET6 && memcmp(ifaname, "eth0", 4) == 0 ) {                s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6),                          host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);                  if (s != 0) {                      printf("getnameinfo() failed: %s\n", gai_strerror(s));                      return -1;                  }if (strchr(host, '%') == NULL){printf("%s IPv6 addr:%s\n", ifa->ifa_name, host);}    }else{continue;      }              }                freeifaddrs(ifaddr);return 0;}

方法二：bymulgetipv6.c

#include "mynet.h"int main(){const char* muladdr = "ff0e::2";int sockfd;int len;int on = 1;struct sockaddr_in6 iface_out;struct sockaddr_in6 remote;char address[45];memset(&remote, 0, sizeof( struct sockaddr_in6  ));remote.sin6_family = AF_INET6;inet_pton(AF_INET6, muladdr, &remote.sin6_addr);remote.sin6_port = htons(10086);memset(&iface_out, 0, sizeof( struct sockaddr_in6));sockfd = socket(AF_INET6, SOCK_DGRAM, 0);if ( setsockopt(sockfd , SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) == -1 ) {perror("DEBUG: [get_output_if] setsockopt(SOL_SOCKET, SO_BROADCAST");close(sockfd);return -1;}if ( connect(sockfd, (struct sockaddr *) &remote, sizeof(struct sockaddr_in6)) == -1){perror("IPv6 DEBUG: [get_output_if] connect");close(sockfd);return -1;}len = sizeof(iface_out);if (getsockname(sockfd, (struct sockaddr *) &iface_out, &len) == -1) {perror("DEBUG: [get_output_if] getsockname");close(sockfd);return -1;}close(sockfd);if (iface_out.sin6_addr.s6_addr == 0) {/* what is this case?? */return -1;}inet_ntop(AF_INET6, (const void *) &iface_out.sin6_addr, address, 45);printf("IPV6 address:%s\n",address); }

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