144 lines
4.1 KiB
Plaintext
144 lines
4.1 KiB
Plaintext
PURPOSE of /tools/glibc/Regression/bz676039-Resolver-fails-to-return-all-addresses-of
|
|
Description: Test for bz676039 (Resolver fails to return all addresses of)
|
|
Author: Miroslav Franc <mfranc@redhat.com>
|
|
Bug summary: Resolver fails to return all addresses of multi-homed hosts in /etc/hosts
|
|
Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=676039
|
|
|
|
Description:
|
|
|
|
getaddrinfo does not return all ip addresses on first call when name resolution is done from /etc/hosts.
|
|
|
|
This has been fixed by the following commits upstream:
|
|
|
|
1f0398248c1c581a1203c0d294acde295b949fea
|
|
1ce7d80ddc62d4bb3e8e4f89fbcb6fa21361733d
|
|
|
|
1ce7d80ddc62d4bb3e8e4f89fbcb6fa21361733d is needed because nscd links in getaddrinfo. The side-effect is that a similar bug in nscd will also be fixed (upstream bug #4814).
|
|
|
|
Private branch: private-spoyarek-ROS00401237
|
|
Build: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=3051905
|
|
|
|
|
|
Customer has verified that the patch works
|
|
|
|
This issue was first reported to Oracle as a problem with Java. The public link to the report can be found here:
|
|
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7007462
|
|
|
|
Consider the following setup on RedHat Enterprise Linux 5.5 x64.
|
|
1) Add the following lines to /etc/hosts:
|
|
multihost 1.1.1.1
|
|
multihost 2.2.2.2
|
|
multihost 3.3.3.3
|
|
|
|
2) Add the following line to /etc/host.conf:
|
|
multi on
|
|
|
|
3) Compile and execute the following program (provided by Oracle Java engineering team):
|
|
|
|
/* This test code is to be used for demonstrating the
|
|
* issue associated with SR 2-8229521.
|
|
*/
|
|
#include <stdio.h>
|
|
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
#include <string.h>
|
|
#include <strings.h>
|
|
#include <stdlib.h>
|
|
#include <ctype.h>
|
|
|
|
void dump_res(struct addrinfo * p_res){
|
|
struct addrinfo *iter = p_res;
|
|
while(iter != 0){
|
|
struct sockaddr_in *addr1b;
|
|
addr1b = (struct sockaddr_in *)iter->ai_addr;
|
|
printf("getaddrinfo returns: %s %d %d\n", inet_ntoa(addr1b->sin_addr) , iter->ai_family, iter->ai_protocol );
|
|
iter=iter->ai_next;
|
|
}
|
|
}
|
|
|
|
int main(int argc, char *argv[]){
|
|
if (argc != 2){
|
|
printf("Usage prog hostname\n");
|
|
exit(7);
|
|
}
|
|
|
|
struct addrinfo hints, *res;
|
|
int error;
|
|
|
|
bzero(&hints, sizeof(hints));
|
|
hints.ai_flags = AI_CANONNAME;
|
|
hints.ai_family = AF_UNSPEC;
|
|
|
|
printf("======== RH BUG ===============\n");
|
|
|
|
if ( (error = getaddrinfo(argv[1], NULL, &hints, &res) ) ){
|
|
perror("getaddrinfo");
|
|
exit(-1);
|
|
}
|
|
|
|
dump_res(res);
|
|
freeaddrinfo(res);
|
|
|
|
printf("======== WORKAROUND ===============\n");
|
|
|
|
hints.ai_family = AF_INET;
|
|
|
|
if ( (error = getaddrinfo(argv[1], NULL, &hints, &res) ) ){
|
|
perror("getaddrinfo");
|
|
exit(-1);
|
|
}
|
|
|
|
dump_res(res);
|
|
freeaddrinfo(res);
|
|
}
|
|
|
|
4) You can see the following output from the above program:
|
|
# ./a.out multihost
|
|
======== RH BUG ===============
|
|
getaddrinfo returns: 1.1.1.1 2 6
|
|
getaddrinfo returns: 1.1.1.1 2 17
|
|
getaddrinfo returns: 1.1.1.1 2 0
|
|
======== WORKAROUND ===============
|
|
getaddrinfo returns: 1.1.1.1 2 6
|
|
getaddrinfo returns: 1.1.1.1 2 17
|
|
getaddrinfo returns: 1.1.1.1 2 0
|
|
getaddrinfo returns: 2.2.2.2 2 6
|
|
getaddrinfo returns: 2.2.2.2 2 17
|
|
getaddrinfo returns: 2.2.2.2 2 0
|
|
getaddrinfo returns: 3.3.3.3 2 6
|
|
getaddrinfo returns: 3.3.3.3 2 17
|
|
getaddrinfo returns: 3.3.3.3 2 0
|
|
|
|
|
|
Note that a similarly configured Ubuntu 10.10 Server (x64), provides the following - correct - output:
|
|
$ ./a.out multihost
|
|
======== RH BUG ===============
|
|
getaddrinfo returns: 1.1.1.1 2 6
|
|
getaddrinfo returns: 1.1.1.1 2 17
|
|
getaddrinfo returns: 1.1.1.1 2 0
|
|
getaddrinfo returns: 2.2.2.2 2 6
|
|
getaddrinfo returns: 2.2.2.2 2 17
|
|
getaddrinfo returns: 2.2.2.2 2 0
|
|
getaddrinfo returns: 3.3.3.3 2 6
|
|
getaddrinfo returns: 3.3.3.3 2 17
|
|
getaddrinfo returns: 3.3.3.3 2 0
|
|
======== WORKAROUND ===============
|
|
getaddrinfo returns: 1.1.1.1 2 6
|
|
getaddrinfo returns: 1.1.1.1 2 17
|
|
getaddrinfo returns: 1.1.1.1 2 0
|
|
getaddrinfo returns: 2.2.2.2 2 6
|
|
getaddrinfo returns: 2.2.2.2 2 17
|
|
getaddrinfo returns: 2.2.2.2 2 0
|
|
getaddrinfo returns: 3.3.3.3 2 6
|
|
getaddrinfo returns: 3.3.3.3 2 17
|
|
getaddrinfo returns: 3.3.3.3 2 0
|
|
|
|
In other words, hints.ai_family / hints.ai_flags for getaddrinfo are not working properly.
|
|
|
|
According to the manual of getaddrinfo (excerpts): "AF_UNSPEC in ai_family specifies any protocol family (either IPv4 or IPv6, for example)."
|