Re: How can I translate IP to hostname in C
Bjoern A. Zeeb wrote: John Timony wrote: I am writing a c program in FreeBSD,and I can not translate a ip to hostname ,i wonder if there is a function to take this job... You mean like gethostbyaddr()? gethostbyaddr() is considered obsolete, I think. You should use getaddrinfo() instead, which is more flexible and easier to use, and it enables you to easily write code that is independent and agnostic of the address family (IPv4 vs. IPv6 vs. others). The manual page contains detailed example code. Best regards Oliver -- Oliver Fromme, secnetix GmbH Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd The most important decision in [programming] language design concerns what is to be left out. -- Niklaus Wirth ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
How can I translate IP to hostname in C
Hi,guys I am writing a c program in FreeBSD,and I can not translate a ip to hostname ,i wonder if there is a function to take this job... s.o.s -Fabonacc ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How can I translate IP to hostname in C
On Thu, 22 May 2008, John Timony wrote: Hi, I am writing a c program in FreeBSD,and I can not translate a ip to hostname ,i wonder if there is a function to take this job... You mean like gethostbyaddr()? See also http://www.unixguide.net/network/socketfaq/2.24.shtml for further inspiration on this but slightly different topic. -- Bjoern A. Zeeb Stop bit received. Insert coin for new game. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How can I translate IP to hostname in C
John Timony wrote: Hi,guys I am writing a c program in FreeBSD,and I can not translate a ip to hostname ,i wonder if there is a function to take this job... You could use gethostbyaddr(3), but those traditional functions have been replaced with more flexible versions such as getnameinfo(3) on newer systems. There's a good introduction to modern sockets programming at http://people.redhat.com/drepper/userapi-ipv6.html -- Bruce Cran ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How can I translate IP to hostname in C
On Thu, May 22, 2008 at 04:14:46PM +, Bjoern A. Zeeb wrote: On Thu, 22 May 2008, John Timony wrote: Hi, I am writing a c program in FreeBSD,and I can not translate a ip to hostname ,i wonder if there is a function to take this job... You mean like gethostbyaddr()? See also http://www.unixguide.net/network/socketfaq/2.24.shtml for further inspiration on this but slightly different topic. You can also use the newer getaddrinfo(3)/freeaddrinfo(3). I think it is bit easier to use and can it transparently handle inet6 addresses as well. The only downside is that some rare old systems don't support it. On FreeBSD it is suppoorted since FreeBSD-4, but some commerical OS implemented it later. -- B.Walter [EMAIL PROTECTED] http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How can I translate IP to hostname in C
On Thu, May 22, 2008 at 07:30:45PM +0100, Bruce Cran wrote: John Timony wrote: Hi,guys I am writing a c program in FreeBSD,and I can not translate a ip to hostname ,i wonder if there is a function to take this job... You could use gethostbyaddr(3), but those traditional functions have been replaced with more flexible versions such as getnameinfo(3) on newer systems. There's a good introduction to modern sockets programming at http://people.redhat.com/drepper/userapi-ipv6.html Ups - yes that's what I ment in my mail. I wrote getaddrinfo, which is the other direction... -- B.Walter [EMAIL PROTECTED] http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
