Re: Is glibc getaddrinfo() working on your etch-amd64 system?
From: "YOSHIFUJI Hideaki / 吉藤英明" <[EMAIL PROTECTED]> It is nothing to do with amd64, but the usage; getaddrinfo() is not for reserve DNS lookups. For that purpose, use getnameinfo() instead. Thank you! If you don't mind, I am wondering why getaddrinfo() previously worked for reverse lookups? Was it just an accident? Note, I'm not trying to argue... I'm just surpised and curious. The man page for getaddrinfo() says, "The getaddrinfo(3) function combines the functionality provided by the getipnodebyname(3), getipnodebyaddr(3), getservbyname(3), and getservbyport(3) functions into a single interface." And the man page for getipnodebyaddr() says, "The getipnodebyaddr(3) function looks up the name of the host whose network address is specified by the addr parameter." So it sounds like the man page is saying that getaddrinfo() includes the functionality of getipnodebyaddr() ? Anyway - thank you for your help! I'm off to inquire on the ruby-core mailing list, because Ruby also uses getaddrinfo() to perform reverse lookups. (That is how my journey began: my Ruby code stopped working when I upgraded to etch.) Regards, Bill -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Is glibc getaddrinfo() working on your etch-amd64 system?
In article <[EMAIL PROTECTED]> (at Wed, 28 Nov 2007 01:28:04 -0800), "Bill
Kelly" <[EMAIL PROTECTED]> says:
> I'm in the process of trying to debug why getaddrinfo() is
> failing to perform reverse DNS lookups on my etch-amd64
> system. (glibc version 2.3.6.ds1-13etch2)
It is nothing to do with amd64, but the usage;
getaddrinfo() is not for reserve DNS lookups.
For that purpose, use getnameinfo() instead.
--yoshfuji
--- getaddrinfo-test.c.orig 2007-11-26 15:51:17.0 +0900
+++ getaddrinfo-test.c 2007-11-28 19:49:33.164757204 +0900
@@ -19,7 +19,6 @@
const char *host = "208.77.188.166"; // www.example.com
const char *port = NULL;
int socktype = SOCK_STREAM;
- int flags = AI_CANONNAME;
struct addrinfo hints;
struct addrinfo* res = NULL;
@@ -28,14 +27,28 @@
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = socktype;
- hints.ai_flags = flags;
+ hints.ai_flags = 0;
error = getaddrinfo(host, port, &hints, &res);
- fprintf(stderr, "sock_addrinfo: error=%d res->ai_canonname='%s'\n",
error, (res && res->ai_canonname)? res->ai_canonname : "NULL");
+ if (error) {
+ fprintf(stderr, "sock_addrinfo: error=%d: %s\n",
+ error, gai_strerror(error));
+ return 4;
+ }
+
+ if (res) {
+ char hostbuf[NI_MAXHOST] = "???";
+
+ error = getnameinfo(res->ai_addr, res->ai_addrlen,
+ hostbuf, sizeof(hostbuf), NULL, 0,
+ 0);
+
+ fprintf(stderr, "sock_nameinfo: error=%d, host=%s\n",
+ error, hostbuf);
- if (res)
freeaddrinfo(res);
+ }
return 0;
}
--yoshfuji
--
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Re: Is glibc getaddrinfo() working on your etch-amd64 system?
Bill Kelly wrote: Hi, I'm in the process of trying to debug why getaddrinfo() is failing to perform reverse DNS lookups on my etch-amd64 system. (glibc version 2.3.6.ds1-13etch2) I've posted a tiny C program here that reproduces the problem: http://cila-search.net/~billk/debug/getaddrinfo/ ( getaddrinfo-test.c ) I'm hoping some folks on this list might be willing to compile and run the program on your systems, and see if yours is broken the same way. If it works properly you should see "www.example.com". If it's broken you should see "208.77.188.166". For example: $ gcc getaddrinfo-test.c $ ./a.out sock_addrinfo: error=0 res->ai_canonname='208.77.188.166' You can cross-check with the host command on the command line: $ host 208.77.188.166 166.188.77.208.in-addr.arpa domain name pointer www.example.com. If the host command says "www.example.com" but the C program says "208.77.188.166" then your system would appear to be broken like mine. Well, here indeed the program did not work: $ ./getaddrinfo-test sock_addrinfo: error=0 res->ai_canonname='208.77.188.166' $ host 208.77.188.166 Name: www.example.com Address: 208.77.188.166 libc6 version 2.6.1-1 -- Distrust all those who love you extremely upon a very slight acquaintance and without any visible reason. -- Lord Chesterfield Eduardo M KALINOWSKI [EMAIL PROTECTED] http://move.to/hpkb -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Is glibc getaddrinfo() working on your etch-amd64 system?
Hi, I'm in the process of trying to debug why getaddrinfo() is failing to perform reverse DNS lookups on my etch-amd64 system. (glibc version 2.3.6.ds1-13etch2) I've posted a tiny C program here that reproduces the problem: http://cila-search.net/~billk/debug/getaddrinfo/ ( getaddrinfo-test.c ) I'm hoping some folks on this list might be willing to compile and run the program on your systems, and see if yours is broken the same way. If it works properly you should see "www.example.com". If it's broken you should see "208.77.188.166". For example: $ gcc getaddrinfo-test.c $ ./a.out sock_addrinfo: error=0 res->ai_canonname='208.77.188.166' You can cross-check with the host command on the command line: $ host 208.77.188.166 166.188.77.208.in-addr.arpa domain name pointer www.example.com. If the host command says "www.example.com" but the C program says "208.77.188.166" then your system would appear to be broken like mine. Thanks for your consideration, Regards, Bill -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
