在iPhone / iPad上获取ARP表 [英] Getting ARP table on iPhone/iPad

问题描述

我正试图在我的iPad上获取ARP条目，如这里。

I am trying to get the ARP entries on my iPad like here.

当编译代码在我的iPad上运行时（所以不是模拟器）我会丢失标题错误消息。您可以通过将头文件复制到本地项目来解决这些问题，如发布。

When compiling the code to run on my iPad (so not the simulator) I am getting missing header error messages. You can resolve them by copying the header files into you project locally as mentioned in this post.

问题在于

sdl =（struct sockaddr_dl *） （sin + 1）;

sdl = (struct sockaddr_dl *)(sin + 1);

在这段代码中：

-(NSString*) ip2mac: (char*) ip 
{ 

    int expire_time, flags, export_only, doing_proxy, found_entry; 

    NSString *mAddr = nil; 
    u_long addr = inet_addr(ip); 
    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; 

    mib[0] = CTL_NET; 
    mib[1] = PF_ROUTE; 
    mib[2] = 0; 
    mib[3] = AF_INET; 
    mib[4] = NET_RT_FLAGS; 
    mib[5] = RTF_LLINFO; 
    if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 
        err(1, "route-sysctl-estimate"); 
    if ((buf = malloc(needed)) == NULL) 
        err(1, "malloc"); 
    if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 
        err(1, "actual retrieval of routing table"); 


    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); 
        if (addr) { 
            if (addr != sin->sin_addr.s_addr) 
                continue; 
            found_entry = 1; 
        } 
        if (nflag == 0) 
            hp = gethostbyaddr((caddr_t)&(sin->sin_addr), 
                               sizeof sin->sin_addr, AF_INET); 
        else 
            hp = 0; 
        if (hp) 
            host = hp->h_name; 
        else { 
            host = "?"; 
            if (h_errno == TRY_AGAIN) 
                nflag = 1; 
        } 



        if (sdl->sdl_alen) { 

            u_char *cp = LLADDR(sdl); 

            mAddr = [NSString stringWithFormat:@"%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]]; 


        //  ether_print((u_char *)LLADDR(sdl)); 
        } 
        else 

            mAddr = nil; 



    } 


    if (found_entry == 0) { 
        return nil; 
    } else { 
        return mAddr; 
    } 




} 

它给出以下错误消息：

指向不完整类型'struct sockaddr_inarp *'的指针的算术

编译iPad模拟器的代码时，一切运行正常。

When you compile the code for the iPad simulator everything runs fine.

有没有人知道如何解决这个问题？
类似的问题（但未解决）被问到这里。

Does anyone have an idea how to solve this? A similar question (but not solved) is asked here.

推荐答案

导入< netinet / if_ether.h>后，您应该编辑它并更改行

After importing <netinet/if_ether.h>, you should edit it and change the line

#include <net/if_arp.h>

到

#include "if_arp.h"

然后导入< net / if_arp.h> ;在你的项目中也是如此。这应该可以解决这个错误。

and then import <net/if_arp.h> in your project as well. This should fix that error.

无论如何，你需要导入来编译你发布的代码的标题是：

Anyway the headers you need to import to compile the code you posted are:

#include "if_ether.h"
#include "route.h"
#include "if_arp.h"
#include "if_dl.h"

希望这会有所帮助=）

编辑：

您需要将文件添加到项目中，而不是简单地使用#import或#include导入它。
您可以从以下链接中找到以上文件：
netinet下的文件
net下的文件

You need to "Add files to project", not simply importing it with #import or #include. You can find above files from following links: Files under "netinet" Files under "net"

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