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POGetting ARP table on iPhone/iPad
 

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    <p>I am trying to get the ARP entries on my iPad like <a href="https://stackoverflow.com/questions/2189200/get-router-mac-without-system-call-for-arp-in-objective-c" title="https://stackoverflow.com/questions/2189200/get-router-mac-without-system-call-for-arp-in-objective-c">here</a>.</p> <p>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 <a href="https://stackoverflow.com/questions/2258172/how-do-i-query-the-arp-table-on-iphone" title="https://stackoverflow.com/questions/2258172/how-do-i-query-the-arp-table-on-iphone">post</a>. </p> <p>The problem lies in the line</p> <blockquote> <p>sdl = (struct sockaddr_dl *)(sin + 1);</p> </blockquote> <p>in this piece of code:</p> <pre><code>-(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, &amp;needed, NULL, 0) &lt; 0) err(1, "route-sysctl-estimate"); if ((buf = malloc(needed)) == NULL) err(1, "malloc"); if (sysctl(mib, 6, buf, &amp;needed, NULL, 0) &lt; 0) err(1, "actual retrieval of routing table"); lim = buf + needed; for (next = buf; next &lt; lim; next += rtm-&gt;rtm_msglen) { rtm = (struct rt_msghdr *)next; sin = (struct sockaddr_inarp *)(rtm + 1); sdl = (struct sockaddr_dl *)(sin + 1); if (addr) { if (addr != sin-&gt;sin_addr.s_addr) continue; found_entry = 1; } if (nflag == 0) hp = gethostbyaddr((caddr_t)&amp;(sin-&gt;sin_addr), sizeof sin-&gt;sin_addr, AF_INET); else hp = 0; if (hp) host = hp-&gt;h_name; else { host = "?"; if (h_errno == TRY_AGAIN) nflag = 1; } if (sdl-&gt;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; } } </code></pre> <p>It gives the following error message:</p> <p><strong>Arithmetic on pointer to incomplete type 'struct sockaddr_inarp*'</strong> </p> <p>When you compile the code for the iPad simulator everything runs fine.</p> <p>Does anyone have an idea how to solve this? A similar question (but not solved) is asked <a href="http://www.iphonedevsdk.com/forum/iphone-sdk-development/76712-help-implementing-arp-iphone.html#post428871" rel="nofollow noreferrer" title="http://www.iphonedevsdk.com/forum/iphone-sdk-development/76712-help-implementing-arp-iphone.html#post428871">here</a>.</p>
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