Hello, all!
Can you please help me to find workaround?
First of all description. As far as I know net-snmp uses mibs/.index file to
remember MIB modules.
I deleted that index file and net-snmp could not load any mibs with errors:
Cannot find module (IP-MIB): At line 0 in (none)
parse-mibs:
Cannot find module (IF-MIB): At line 0 in (none)
parse-mibs:
Cannot find module (TCP-MIB): At line 0 in (none)
parse-mibs:
Cannot find module (UDP-MIB): At line 0 in (none)
...
I tried to find out a root cause in code of 5.4.2.1. It is in next lines:
function: add_mibdir():
...
if ((dir = opendir(dirname))) {
snprintf(tmpstr, sizeof(tmpstr), "%s/.index", dirname);
tmpstr[ sizeof(tmpstr)-1 ] = 0;
ip = fopen(tmpstr, "w");
while ((file = readdir(dir))) {
/*
* Only parse file names that don't begin with a '.'
* Also skip files ending in '~', or starting/ending
* with '#' which are typically editor backup files.
*/
if (file->d_name != NULL) {
fname_len = strlen( file->d_name );
if (fname_len > 0 && file->d_name[0] != '.'
&& file->d_name[0] != '#'
&& file->d_name[fname_len-1] != '#'
&& file->d_name[fname_len-1] != '~') {
snprintf(tmpstr, sizeof(tmpstr), "%s/%s", dirname, file->d_name);
tmpstr[ sizeof(tmpstr)-1 ] = 0;
if ((dir2 = opendir(tmpstr))) {
/*
* file is a directory, don't read it
*/
closedir(dir2);
} else {
if ( !add_mibfile( tmpstr, file->d_name, ip ))
count++;
}
}
...
closer:
if ((dir2 = opendir(tmpstr))) { <--- OPENDIR CAN OPEN A FILE EVEN IT IS
NOT A DIRECTORY
/*
* file is a directory, don't read it
*/
closedir(dir2);
test.c:
#include<stdio.h>
#include <dirent.h>
int main(int argc,char**argv)
{
DIR*d;
if((d=opendir(argv[1])))
{
printf("OPEN: %s\n",argv[1]);
if(readdir(d))
{
puts("readdir: NOT NULL");
}
else
{
perror("readdir NULL");
}
}
else
{
perror("opendir");
}
return 0;
}
result under Debian:
bubnov /home/alek> uname -a
Linux bubnov 2.6.18-6-686 #1 SMP Mon Oct 13 16:13:09 UTC 2008 i686 GNU/Linux
bubnov /home/alek> :> 1
bubnov /home/alek> ./a.out 1
opendir: Not a directory
result under Suse (10.3 and 11 too):
linux-h110 /root# uname -a
Linux linux-h110 2.6.22.5-31-default #1 SMP 2007/09/21 22:29:00 UTC i686
i686 i386 GNU/Linux
linux-h110 /root# :> 1
linux-h110 /root# ./a.out 1
OPEN: 1
readdir NULL: Not a directory
Note: both of that OSes uses EXT3
Below the root cause of why I cannot add a new MIB module.
My question is: How to load a new module? What is workaround for that case?
One of possible solution is to edit .index file. Is it another?
And I have another question why net-snmp could create .index file at first
run?
--
/BR, Alexander
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