Hi,
And the code is:
// found on stackoverflow: Hex String to Byte Array in
C<http://stackoverflow.com/questions/3408706/hex-string-to-byte-array-in-c>
char s_buf[20]; // Hex string with colon
char *pos = s_buf;
unsigned char s_mac_addr[6];
size_t count = 0;
// convert Hex string to unsigned char buffer
for(count = 0; count < sizeof(s_mac_addr)/sizeof(s_mac_addr[0]);
count++) {
sscanf(pos, "%2hhx", &s_mac_addr[count]);
pos += 3 * sizeof(char); // skip 3
}
thanks,
FB
2012/10/1 Bill Fenner <[email protected]>
> On Wed, Sep 26, 2012 at 4:54 PM, Francois Bouchard
> <[email protected]> wrote:
> > Hi list,
> >
> > Question about one MacAddress SNMP oject type we have in the MIB.
> >
> > When sending a snmpget request to the MacAddress Object with the textual
> > names:
> >
> > $ snmpget -v 3 -u ...... MPBC-RMH-MIB::mpbcRMHMacAddress.0 we get
> garbage:
> > MPBC-RMH-MIB::mpbcRMHMacAddress.0 = STRING:
> > 36:43:3a:46:46:3a:42:45:3a:30:31:3a:30:30:3a:31:35
> >
> > Then, if sending the getsnmp to the same object, but using the OID we get
> > the correct value "6C:FF:BE:01:00:15":
> > $ snmpget -v 3 -u ... .1.3.6.1.4.1.4464.2.1.4.1.5.0
> > SNMPv2-SMI::enterprises.4464.2.1.4.1.5.0 = STRING: "6C:FF:BE:01:00:15"
> >
> >
> > So in the code I should limit the string to 6 Bytes. So must I omit the
> > colon separated string when writing (see C source)?
>
> Yes, you must turn the colon separated ASCII string that you get from
> the Exec_Popen_Cmd() call into 6 bytes, and return that.
>
> Make sure not to use strlen, since 0 is a valid value inside a MAC address.
>
> Bill
>
> >
> > Thanks,
> >
> > Francois
> >
> >
> > From the C source:
> >
> > // Get MAC, format : "11:22:33:44:55:66"
> > if(!Exec_Popen_Cmd(s_mac_addr, sizeof(s_mac_addr), "ifconfig -a eth0
> |
> > grep HWaddr | awk ' {print $5}'"))
> > {
> > strcpy(s_mac_addr, "??:??:??:??:??:??");
> > }
> >
> >
> > /* We are never called for a GETNEXT if it's registered as a
> > "instance", as it's "magically" handled for us. */
> >
> > /* a instance handler also only hands us one request at a time, so
> > we don't need to loop over a list of requests; we'll only get
> one. */
> >
> > switch(reqinfo->mode) {
> >
> > case MODE_GET:
> >
> > snmp_set_var_typed_value(requests->requestvb, ASN_OCTET_STR,
> > s_mac_addr, strlen(s_mac_addr)); // the length of the data in bytes
> > break;
> >
> >
> > default:
> > /* we should never get here, so this is a really bad error */
> > snmp_log(LOG_ERR, "unknown mode (%d) in
> > handle_mpbcRMHMacAddress\n", reqinfo->mode );
> > return SNMP_ERR_GENERR;
> > }
> >
> > (...)
> >
> >
> >
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