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PO
primarykey
Id
10475937
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AcceptedAnswerId
0
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0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2012-05-07T02:15:50.357
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2012-05-07T18:23:08.403
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2012-05-07T18:23:08.403
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1139725
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1139725
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4023222
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2
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LastEditorDisplayName
text
Body
To get the list of interfaces and IP addresses, use <code>getifaddrs()</code>. Search for interfaces with <code>ifa_addr->sa_family == AF_INET</code> The IP address is in <code>sin_addr.s_addr</code>. You can then use <code>gethostbyaddr()</code> to look up the DNS name for that IP address. Update: It was pointed out to me that the OP was probably asking about discovering other hosts, rather than the addresses of interfaces on the local machine. There is no reliable way to discover other machines on the local area network, but there are a couple of tricks. <ul> <li>Ping method: Use the ping utility (or a programatic equivalent) to ping the local broadcast address, then see who responds. The broadcast address can be found by listing the interfaces as shown above. I believe ICMP does not require root access under OSX. Note that many systems may have ICMP ping disabled or firewalled, so you will only get responses from the non-stealth ones.</li> <li>ARP method: Check the system ARP cache to see what IP addresses have been recently active. This will only show systems which have broadcast packets on the same network segment in recent minutes.</li> </ul> Both methods can be blocked by firewalls, routers, and even switches, so the exact borders of the "LAN" can be pretty narrow. Both methods can be implemented programmatically, but it might be simpler and more portable to just call out to the command line <code>ping</code> or <code>arp</code> commands.
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1. This table or related slice is empty.
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1. POList of all hosts on LAN network
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1. PTAnswer
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1. USSeth Noble
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1. USSeth Noble
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1. POList of all hosts on LAN network
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1. COThe question sounds more like the author wants to enumerate all the different hosts on the LAN, not just information about the current hosts' uplinks.
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 USjdizzle
2. COPerhaps. I see now that the original question was not platform specific, so you are probably correct.
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 USSeth Noble

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