iOS设备打印连接到同一Wifi的其余设备清单

打印Arp

1.首先引入头文件

#include <sys/param.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>


#include <arpa/inet.h>

#include <err.h>
#include <errno.h>
#include <netdb.h>

#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

2.添加函数

- (void)printArp
{
    int mib[6];
    size_t needed;
    char *host, *lim, *buf, *next;
    struct rt_msghdr *rtm;
    struct sockaddr_inarp *sin;
    struct sockaddr_dl *sdl;
    extern int h_errno;
    struct hostent *hp = NULL;
    
    mib[0] = CTL_NET;
    mib[1] = PF_ROUTE;
    mib[2] = 0;
    mib[3] = AF_INET;
    mib[4] = NET_RT_FLAGS;
    mib[5] = RTF_LLINFO;
    
    sysctl(mib, 6, NULL, &needed, NULL, 0);
    buf = malloc(needed);
    
    sysctl(mib, 6, buf, &needed, NULL, 0);
    lim = buf + needed;
    
    for (next = buf; next < lim; next += rtm->rtm_msglen) {
        rtm = (struct rt_msghdr *)next;
        sin = (struct sockaddr_inarp *)(rtm + 1);
        sdl = (struct sockaddr_dl *)(sin + 1);
        
        hp = gethostbyaddr((caddr_t)&(sin->sin_addr),
                               sizeof sin->sin_addr, AF_INET);
        host = hp->h_name;
       
        printf("%s--%s--at ", host, inet_ntoa(sin->sin_addr));
        if (sdl->sdl_alen)
        {
            u_char *cp = (u_char *)LLADDR(sdl);
            printf("%x:%x:%x:%x:%x:%x\n", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
        }
    }
}

3.调用上述函数即可

移动设备

Arp打印出来的只有PC，至于移动设备，我是用UDP广播识别的。