小编sha*_*ggy的帖子

有没有办法通过接口获取MAC地址getifaddrs()？

我已经有了这个,获取IP地址,但我有点想念MAC.我试图寻找信息getifaddrs(),但没有任何关于MAC地址

struct ifaddrs *iflist, *iface;

  if (getifaddrs(&iflist) < 0) 
  {
      perror("getifaddrs");
  }

  char addrp[INET6_ADDRSTRLEN];
  char macp[INET6_ADDRSTRLEN];
  int i=0;

  for (iface = iflist; iface; iface = iface->ifa_next) 
  {
    int af = iface->ifa_addr->sa_family;
    const void *addr;
    const void *mac;

      switch (af) 
      {
        case AF_INET:
          addr = &((struct sockaddr_in *)iface->ifa_addr)->sin_addr;
          break;
      //get mac address somehow?
        default:
          addr = NULL;
      }

      if (addr) 
      {
        if (inet_ntop(af, addr, addrp, sizeof addrp) == NULL)
        {
           perror("inet_ntop");
           continue; …

可能重复:
Linux/C++:获取本地计算机的IP地址

我试图获取本地计算机的所有接口的IP和MAC地址,但我不能真正成功.我需要把它放在一起,所以我知道哪个IP属于哪个MAC.

我在google上进行了很多搜索,甚至在这里,但是我找不到真正的C代码.

请你帮助我好吗？

提前致谢!我真的很感激!

我需要将两个args传递给shell脚本,这里是代码:

#include <stdio.h>

#include <stdlib.h>

void main()
{
char *script;
int lines = 1;
sprintf(script, "/...path.../line.sh %d %d", lines, lines);
system(script);
}

该脚本运行良好,我尝试过.但我总是得到分段错误.问题是:为什么？

谢谢

怎么弄这个:

printf(" %02x:%02x:%02x:%02x:%02x:%02x",
(unsigned char)item->ifr_hwaddr.sa_data[0],
(unsigned char)item->ifr_hwaddr.sa_data[1],
(unsigned char)item->ifr_hwaddr.sa_data[2],
(unsigned char)item->ifr_hwaddr.sa_data[3],
(unsigned char)item->ifr_hwaddr.sa_data[4],
(unsigned char)item->ifr_hwaddr.sa_data[5]);

进入此(存储在变量中,不打印它):

char mac[18];

谢谢

我总是得到malloc()错误.这是代码:

char *data = malloc(200);
add_data(data, tableO, line);

void add_data(char *data, struct ARP_entryO *tableO, int line)
{
  int i=0;

  while (i < line)
  {
    strcat(data, tableO[i].IPaddr);
    strcat(data, " ");
    strcat(data, tableO[i].MACaddr);
    strcat(data, " ");
    i++;
  }
}

我通常发送大约50-60bytes.有什么帮助解决这个问题？

谢谢

我通过这样的套接字在网络上发送数据:(广播)

    void sendBroad(char *dstIP, char *localIP, char *localMAC)
{
    int sock;                         /* Socket */
    struct sockaddr_in broadcastAddr; /* Broadcast address */
    int broadcastPermission;          /* Socket opt to set permission to broadcast */
    unsigned int dataLen;
    char data[100]={0};

    strcat(data, localIP);
    strcat(data, " ");
    strcat(data, localMAC);
    strcat(data, " ");


    /* Create socket for sending/receiving datagrams */
    if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
        perror("socket() failed");

    /* Set socket to allow broadcast */
    broadcastPermission = 1;
    if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (void *) …

我需要同时运行两个独立的进程.一个只是侦听端口X,并在收到数据时发送数据,第二个是执行其他操作.

我试过这个: pthread_t thread1, thread2; int iret1, iret2;

iret1 = pthread_create( &thread1, NULL, getAddress(), NULL);

iret2 = pthread_create( &thread2, NULL, operate(), (struct IPlist) *IPlist);

在第一个我想运行get(Address)- 监听和发送部分,在第二个我需要运行operate()一个arg:*IP list //(struct IPlist *IPlist)

但是,它显示错误:

warning: passing argument 3 of ‘pthread_create’ makes pointer from integer without a cast /usr/include/pthread.h:225: note: expected ‘void * (*)(void *)’ but argument is of type int

error: incompatible type for argument 4 of ‘pthread_create’ /usr/include/pthread.h:225: note: expected ‘void * __restrict__’ but argument is of …

我试图在Linux中的ARP表中添加ARP绑定,我的arp表看起来像这样:

IP address       HW type     Flags       HW address            Mask     Device
192.168.3.12     0x1         0x6         00:0c:29:89:c5:cc     *        eth1
192.168.3.100    0x1         0x6         00:0c:29:89:c5:c8     *        eth1
192.168.43.2     0x1         0x2         00:50:56:e1:65:76     *        eth0
192.168.3.111    0x1         0x6         00:11:22:33:44:55     *        eth1
192.168.43.139   0x1         0x6         00:0c:29:89:c5:cc     *        eth0

这是我想要做的,但我得到以下错误:

arp -s 192.168.43.138 00:00:22:33:33:33
SIOCSARP: Invalid argument

任何其他IP地址工作正常,只是这一个导致错误任何想法这里有什么问题？(这可能不是mac地址的问题,我尝试了很多其他地址)