如何从C在linux设置IP地址 [英] How to set the IP address from C in linux
本文介绍了如何从C在linux设置IP地址的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
通过使用strace的和ifconfig,我发现我可以设置IP地址这种方式:
By using strace and ifconfig, I found that I can set the IP address this way:
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <string.h>
int main(int argc, const char *argv[]) {
struct ifreq ifr;
const char * name = "eth1";
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
strncpy(ifr.ifr_name, name, IFNAMSIZ);
ifr.ifr_addr.sa_family = AF_INET;
inet_pton(AF_INET, "10.12.0.1", ifr.ifr_addr.sa_data + 2);
ioctl(fd, SIOCSIFADDR, &ifr);
inet_pton(AF_INET, "255.255.0.0", ifr.ifr_addr.sa_data + 2);
ioctl(fd, SIOCSIFNETMASK, &ifr);
ioctl(fd, SIOCGIFFLAGS, &ifr);
strncpy(ifr.ifr_name, name, IFNAMSIZ);
ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
ioctl(fd, SIOCSIFFLAGS, &ifr);
return 0;
}
但我不是很高兴与此解决方案:
But I am not very happy with this solution:
inet_pton(AF_INET, "10.12.0.1", ifr.ifr_addr.sa_data + 2);
什么是这样做的正确的方式?
What is the "right" way of doing this?
推荐答案
正确的方式对IPv4不用魔法+2:
The "correct" way for IPv4 without magic +2:
struct sockaddr_in* addr = (struct sockaddr_in*)&ifr.ifr_addr;
inet_pton(AF_INET, "10.12.0.1", &addr->sin_addr);
要使用IPv6,将其转换为体sockaddr_in6
To use IPv6, cast it to sockaddr_in6
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