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Linux下怎样获取本机IP地址？
来源: 互联网 发布时间：2015-10-28
本文导语: 我才用gethostbyname获取，结果得到的是127.0.0.1。但是我想要的不是这个地址，而是我们用ifconfig看到的局域网地址。有哪位仁兄知道？小弟在这里先谢了！！！！ | 刚好我前段时间写了一个，分...
我才用gethostbyname获取，结果得到的是127.0.0.1。但是我想要的不是这个地址，而是我们用ifconfig看到的局域网地址。有哪位仁兄知道？小弟在这里先谢了！！！！
|
刚好我前段时间写了一个，分享一下，高手也请多提意见
int get_ip_addr(const char *name, char *ipaddr)
{
int sockfd;
struct ifreq ifr;
struct sockaddr_in *sin;
struct hostent *addr;
if (name == NULL || ipaddr == NULL)
{
TRACE("there has illegal parameters!n");
return false;
}
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) = 0)
{
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = (caddr_t) buf;
if (!ioctl(fd, SIOCGIFCONF, (char *) &ifc))
{
intrface = ifc.ifc_len / sizeof(struct ifreq);
printf("interface num is intrface=%dnnn", intrface);
while (intrface-- > 0)
{
printf("net device %sn", buf[intrface].ifr_name);
/*Jugde whether the net card status is promisc */
if (!(ioctl(fd, SIOCGIFFLAGS, (char *) &buf[intrface])))
{
if (buf[intrface].ifr_flags & IFF_PROMISC)
{
puts("the interface is PROMISC");
retn++;
}
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s",
buf[intrface].ifr_name);
perror(str);
}
/*Jugde whether the net card status is up */
if (buf[intrface].ifr_flags & IFF_UP)
{
puts("the interface status is UP");
}
else
{
puts("the interface status is DOWN");
}
/*Get IP of the net card */
if (!(ioctl(fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
puts("IP address is:");
puts(inet_ntoa(((struct sockaddr_in *)
(&buf[intrface].ifr_addr))->sin_addr));
puts("");
//puts (buf[intrface].ifr_addr.sa_data);
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s",
buf[intrface].ifr_name);
perror(str);
}
/*Get HW ADDRESS of the net card */
if (!(ioctl(fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
{
puts("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02xn",
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[0],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[1],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[2],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[3],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[4],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[5]);
puts("");
puts("");
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror(str);
}
}
}
else
perror("cpm: ioctl");
}
else
perror("cpm: socket");
close(fd);
return retn;
}
int get_ip_addr(const char *name, char *ipaddr)
{
int sockfd;
struct ifreq ifr;
struct sockaddr_in *sin;
struct hostent *addr;
if (name == NULL || ipaddr == NULL)
{
TRACE("there has illegal parameters!n");
return false;
}
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) = 0)
{
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = (caddr_t) buf;
if (!ioctl(fd, SIOCGIFCONF, (char *) &ifc))
{
intrface = ifc.ifc_len / sizeof(struct ifreq);
printf("interface num is intrface=%dnnn", intrface);
while (intrface-- > 0)
{
printf("net device %sn", buf[intrface].ifr_name);
/*Jugde whether the net card status is promisc */
if (!(ioctl(fd, SIOCGIFFLAGS, (char *) &buf[intrface])))
{
if (buf[intrface].ifr_flags & IFF_PROMISC)
{
puts("the interface is PROMISC");
retn++;
}
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s",
buf[intrface].ifr_name);
perror(str);
}
/*Jugde whether the net card status is up */
if (buf[intrface].ifr_flags & IFF_UP)
{
puts("the interface status is UP");
}
else
{
puts("the interface status is DOWN");
}
/*Get IP of the net card */
if (!(ioctl(fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
puts("IP address is:");
puts(inet_ntoa(((struct sockaddr_in *)
(&buf[intrface].ifr_addr))->sin_addr));
puts("");
//puts (buf[intrface].ifr_addr.sa_data);
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s",
buf[intrface].ifr_name);
perror(str);
}
/*Get HW ADDRESS of the net card */
if (!(ioctl(fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
{
puts("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02xn",
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[0],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[1],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[2],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[3],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[4],
(unsigned char) buf[intrface].ifr_hwaddr.sa_data[5]);
puts("");
puts("");
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror(str);
}
}
}
else
perror("cpm: ioctl");
}
else
perror("cpm: socket");
close(fd);
return retn;
}
|
取IP地址新的API是getaddrinfo，取代gethostbyname
《UNIX网络编程》这本书有介绍，man也能得到用法
《UNIX网络编程》这本书有介绍，man也能得到用法
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