So far I learned that the information Im looking for, is the interface index. If I receive a message on one of my interfaces I can receive it with UDP (oh yes I forgot to tell you that I have to use UDP) function recvfrom or better "recvmsg". With recvmesg I do not only receive a message from any client, but also get back a filled "struct cmsghdr" (which I have to initialize first, of course). I got this information from Steven's Unix Network Programming. Amongst the data I get back from a filled "struct cmsghdr" is also the interface index of my interface. Exactly what Im searching for. _BUT_ Unfortunally I get this information only if the symbol "HAVE_MSGHDR_MSG_CONTROL" is defined. And this is not the case on my system. Please correct me, if I did not unterstand this matter! So what can I do to get that symbol defined? For owner of this book, its on page 588-592. It would be great if anybody could help me at this point. Sincerely Chris grimson schrieb: > Hello out there, > I got an interesting but challenging problem. > I want to create a daemon-process, which runs on a host with several > NICs. If the daemon gets a request from one of the interfaces, it > should, amongst others, send back the IP-address and/or MAC-address, > interface-name... of the interface from which the request came. And only > of that interface. No infos about local-interfaces and so on. > > My approach so far was to invoke ioctl with the SIOCGIFCONF-request and > collect all informations about every active interface on the host. But I > need at least one unique identifier of the interface from which the > request came. With the interface-name for exeample I can call the/ > /SIOCGIFADDR-request to get the IP-address. How can I achive this. > > Has anybody an idea. > > Thanks in advance. > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-net" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
