linux ip 设置与获取

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#include<stdio.h>
#include<string.h>
#include<errno.h>
#include<sys/socket.h>
#include<sys/ioctl.h>
#include <net/if.h>
#include <arpa/inet.h>
int network_get_ipaddr(int sock_id,char *interface_name, char *ipaddr)
{
struct ifreq ifr;
struct sockaddr_in * ptr;

bzero((char *)&ifr, sizeof(ifr));
strcpy(ifr.ifr_name,interface_name);

if (ioctl(sock_id,SIOCGIFADDR,&ifr) < 0)
{
printf("SIOCGIFADDR failed: %s\n", strerror(errno));
return -1;
}

ptr = (struct sockaddr_in *)&(ifr.ifr_ifru.ifru_addr);
memcpy((char*)ipaddr, (char*)&ptr->sin_addr, sizeof(unsigned long));

printf("IP:%s\n",inet_ntoa(ptr->sin_addr));
return 0;
}

int network_set_ipaddr(int sock_id,char *interface_name, char *ipaddr)
{
struct ifreq ifr;
struct sockaddr_in addr;

bzero((char *)&ifr, sizeof(ifr));
strcpy(ifr.ifr_name,interface_name);

memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, interface_name, sizeof(ifr.ifr_name)-1);

bzero(&addr,sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
inet_aton(ipaddr,&addr.sin_addr);

memcpy((char*)&ifr.ifr_ifru.ifru_addr,(char*)&addr,sizeof(addr));

if (ioctl(sock_id,SIOCSIFADDR,&ifr) < 0)
{
  printf("SIOCSIFADDR failed: %s\n", strerror(errno));
  return -1;
}

return 0;
}

int main()
{
int sock_id;
char ifname[]="eth0";
char ip[16]="192.168.22.176";
char ip1[16];

sock_id=socket(AF_INET,SOCK_DGRAM,0);
if (sock_id < 0)
{
printf("socket failed: %s\n", strerror(errno));
return -1;
}

network_set_ipaddr(sock_id,ifname, ip);
network_get_ipaddr(sock_id,ifname, ip1);

return 0;
}

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