linux下获取本机ip地址,ipv4和ipv6.pdf
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2021-11-23
09:30:24
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linux 下获取本机 ip 地址， ipv4和 ipv6
#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;
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