Re: snmptrapd - avoiding ambiguity in log files

Don Cohen wrote:
> Andre wrote:
> Here's a demo of the problem.  I enter these commands:
>  snmptrapd
>  snmptrap -v 1 -c private 10.0.0.1 TRAP-TEST-MIB::asante 10.0.0.1 6
>   117 '' SNMPv2-MIB::sysLocation.0 s $'XXX' .1.2.3.4 i 1234
>  snmptrap -v 1 -c private 10.0.0.1 TRAP-TEST-MIB::asante 10.0.0.1 6
>   117 '' SNMPv2-MIB::sysLocation.0 s $'XXX, iso.2.3.4 = INTEGER: 1234'
> 
<snip>
> 
> The output is the same.  The input is different.  I should be able to
> determine the input from the output. 
> This problem would be solved if the string were printed with quoting,
> e.g., the first output should say 
>  ... STRING: "XXX"
> and the second
>  ... STRING: "XXX, iso.2.3.4 = INTEGER: 1234"
> and if the string contains any "'s or \'s they could be quoted with a
> preceding \.

The single quote is removed by the shell (assuming you using *nix).  You 
will need to put in the backslashes yourself so it is passed as one 
argument:

snmptrap -v 1 -c private 10.0.0.1 TRAP-TEST-MIB::asante 10.0.0.1 6117 '' 
SNMPv2-MIB::sysLocation.0 s $\'XXX, iso.2.3.4 = INTEGER: 1234\'

Save this as test.c and compile this with 'gcc test.c':

int main(int argc, char *argv[]) {
   int i;
   for (i=0; i<argc; i++) {
     printf("argv: %s\n",argv[i]);
   }
   return 0;
}

Here is my input and output:

$ ./a.out one '' three 'four' \'five\'
argv: ./a.out
argv: one
argv:
argv: three
argv: four
argv: 'five'

As you can see the '' makes it an empty argument, 'four' is seen as just 
four, and \'five\' is seen as 'five'.

Running the above from Windows under a MinGW MSYS shell gives the same 
result.  Running under a Windows command prompt requires double quotes 
instead of single quotes but is otherwise the same.

Alex






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