Linux 编程获取本机所有网卡和IP

#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>

int main()
{
  struct ifaddrs* ifaddr = NULL;
  int ret = getifaddrs(&ifaddr);

  if (ret) {
    printf("getifaddrs failed, errno:%d\n", errno);
    return 1;
  }

  struct ifaddrs* ifp = ifaddr;
  char ip[16];
  char netmask[16];

  for ( ; ifp != NULL; ifp = ifp->ifa_next) {
    if (ifp->ifa_addr && ifp->ifa_addr->sa_family == AF_INET) {
      strncpy(ip, inet_ntoa(((struct sockaddr_in*)ifp->ifa_addr)->sin_addr), 16);
      strncpy(netmask, inet_ntoa(((struct sockaddr_in*)ifp->ifa_netmask)->sin_addr), 16);
      printf("dev:%s, ip:%s, netmask:%s\n", ifp->ifa_name, ip, netmask);
    }
  }

  freeifaddrs(ifaddr);
  return 0;
}