help: Is there a Bug in Net-SNMP when setting a string..

Hi,

Iam using Net-SNMP-5.4.2.1 version and generated the extension files using mib2c.scalar.conf. It has mib attributes for both Integer type and string type(ASN-OCTET-STRING - max length 40chars).

//sample code generated is like this//

      case MODE_SET_ACTION:
            /* XXX: perform the value change here */

                printf("string is %s\n", requests->requestvb->val.string);											
	       ret = strncpy(tmpbuf, requests->requestvb->val.string, 
	    		            strlen(requests->requestvb->val.string));

                printf("Out string is %s\n", requests->requestvb->val.string);
            				
            if (ret) {
                netsnmp_set_request_error(reqinfo, requests, ret);
            }
            break;

        case MODE_SET_COMMIT:
            /* XXX: delete temporary storage */
//            if (/* XXX: error? */) {
//                /* try _really_really_ hard to never get to this point */
//                netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_COMMITFAILED);
//            }
            break;
///////////////////////////////////////////


Setting is working fine for most of the times when I use the smaller strings(6-10 chars).

When I tried to set a string with around 25 chars with some invalid characters in between, Net-SNMP thrown the proper error message.

But next time when I tried set with some 10 chars, other 15 characters are getting appended to the set string, and it says most of the times set failed, after 4 or 5 retrials its working some how.

(From my observation, I feel that the '\0' character is not getting appended to the string after 10 chars, causing the old buffer to append on top of it).

I want to know if this is a known issue and has a patch fix for it Or is it a problem from the application side.

Thanks in advance,
Kishore





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