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