Hi Jeff
If you don't mind - please set the record straight on the Symantec Ideas page?
https://www-secure.symantec.com/connect/ideas/bug-report-netbackup-name-resolution-hp-ux
Regards
M.
-Original Message-
From: veritas-bu-boun...@mailman.eng.auburn.edu
[mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of Lightner, Jeff
Sent: 03 May 2011 07:29 PM
To: Girish Jorapurkar
Cc: veritas-bu@mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] bpclntcmd and others ignoring nsswitch.conf?-RESOLVED
(yes actually resolved this time)
The patch (PHCO_30030) has been superseded more than once and we have one of
the superseding patches PHCO_37369 so would already have the bug fix the
poster at the link mentioned.
However, I'd like to thank you as your pointer helped me resolve the issue:
1) By downloading and compiling his source code I was able to see that I did
have the same issue with his binary as that poster did. (That is to say this
binary like the NetBackup binaries did not resolve from /etc/hosts first but
rather from DNS.)
2) On reviewing the /var/adm/sw/products/PHCO_37369/pfiles/README file that
came with the later patch I saw the following (which is from another patch this
one supersedes so is incorporated):
PHCO_29287:
( QX:QXCR1000523428 SR:8606308071 CR:JAGae71107 )
If IPv6 is enabled on a system, the Internet Services
commands use the APIs getipnodeXX() or get*info() to
resolve the name instead of the APIs gethostbyXX().
The APIs getipnodeXX() and get*info() look into the
ipnodes directive of the /etc/nsswitch.conf to resolve
the name/address. As the NIS/NIS+ backends do not
respond to the ipnodes directive, the resolution of
IPv4 addresses fails for NIS and NIS+ sources.
While we aren't doing anything with NIS/NIS+ the other info about IPv6 was
informative. Turns out that in addition to the standard hosts: line in
/etc/nsswitch.conf HP-UX is expecting an ipnodes: line for binaries that use
the above APIs.
After modifying /etc/nsswtich.conf so it now has both the following lines:
hosts: files [notfound=CONTINUE] dns
ipnodes: files [notfound=CONTINUE] dns
The new binary resolved correctly from /etc/hosts and on testing so did
bpclntcmd. Based on that I restarted the backup that had been going across
the primary LAN previously and it is currently running on the expected backup
LAN.
Presumably this means the 7.1 NetBackup binaries are using the above referenced
APIs on HP-UX where the 6.5.4 binaries didn't.
We never saw this issue on HP-UX up through version 6.5.4 and in testing
yesterday I'd copied the 6.5.4 binary and its associated libraries to another
directory on my HP-UX host and it resolved from /etc/hosts.
I added the ipnodes entry to /etc/nsswitch.conf on the other HP-UX 11.11 media
server and the HP-UX 11.23 client I'd recreated the error on previously. On
adding the line both hosts correctly resolved the backup LAN IP from /etc/hosts
instead of going to DNS.
FYI: ITRC is going away so I'm not sure if the link will still be accessible
in the future. Accordingly I'm including the source code that poster had made
so it is available from this forum.
His source code file was called: 114249.c and I compiled it by running:
cc -o testresolver 114249.c. Usage is simply testresolver hostname.
The source code is as follows:
/* Test program to test IP resolution for domain names
*/
#include stdio.h
#include sys/types.h
#include sys/socket.h
#include arpa/inet.h
#include netdb.h
#include string.h
/* Function to get IP address for hostname
** hostname - (i/p) - Hostname to find IP address
** buffer - (o/p) - Buffer filled with IP address
** buffer_len - (i/p) - Length of buffer
** Return APR_SUCCESS on success
**/
int get_ip_from_hostname(char *hostname)
{
int status = 0;
struct addrinfo hints, *ai, *ai_list;
char host_ip[INET_ADDRSTRLEN];
const char *ret = NULL;
memset(hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
status = getaddrinfo(hostname, NULL, hints, ai_list);
if (status)
{
printf(Failed to resolve IP address for %s \n , hostname);
printf(Error: %s \n, gai_strerror(status));
return status;
}
ai = ai_list;
if(ai)
{
struct sockaddr_in *in = (struct sockaddr_in *)ai-ai_addr;
host_ip[0] = '\0';
ret = inet_ntop(AF_INET, in-sin_addr, host_ip, sizeof(host_ip));
}
freeaddrinfo(ai_list);
if(host_ip)
{
printf(Hostname \%s\ resolves to IP \%s\ \n, hostname, host_ip);
status = 0;
}
else
{
printf(Failed to resolve IP address for %s \n, hostname);
status = -1;
}
return status;
}
void usage()
{
printf(resolve_hostname hostname \n);
return;
}
int main(int argc, char *argv[])
{
char hostname[1024];
if(argc2)
{
