/*!
* \brief Register MIB variables.
*/
int SnmpMibRegister(OID basename[], size_t baselen, SNMPVAR * vars, int num)
{
SUBTREE **tpp;
SUBTREE *branch;
/* Create a new branch. */
if ((branch = malloc(sizeof(SUBTREE))) == NULL) {
return -1;
}
branch->sub_numvars = num;
branch->sub_vars = vars;
branch->sub_namelen = baselen;
memcpy(branch->sub_name, basename, baselen * sizeof(OID));
/* Locate the new branch's insertion point. */
for (tpp = &mibtree; *tpp; tpp = &(*tpp)->sub_next) {
if (SnmpOidCmp((*tpp)->sub_name, (*tpp)->sub_namelen, branch->sub_name, branch->sub_namelen) > 0) {
break;
}
}
/* Insert the branch. */
branch->sub_next = *tpp;
*tpp = branch;
return 0;
}
static u_char *MibVarsIfGet(CONST SNMPVAR * vp, OID * name, size_t * namelen, int exact, size_t * varlen, WMETHOD ** wmethod)
{
int rc;
int ifc = 0;
OID index = 0;
static long zero = 0;
OID *fullname;
size_t fullnamelen = base_oidlen + vp->var_namelen + 1;
fullname = malloc(fullnamelen * sizeof(OID));
memcpy(fullname, base_oid, base_oidlen * sizeof(OID));
memcpy(fullname + base_oidlen, vp->var_name, vp->var_namelen * sizeof(OID));
if (vp->var_magic == MAG_IF_NUMBER) {
/* Determine the number of interfaces. */
*(fullname + fullnamelen - 1) = index;
rc = SnmpOidCmp(name, *namelen, fullname, fullnamelen);
if ((exact && rc) || (!exact && rc >= 0)) {
return NULL;
}
} else {
/* Determine the interface number. */
for (; ifc < if_number; ifc++) {
*(fullname + fullnamelen - 1) = ifc + 1;
rc = SnmpOidCmp(name, *namelen, fullname, fullnamelen);
if ((exact && rc == 0) || (!exact && rc < 0)) {
index = ifc + 1;
break;
}
}
if (index == 0) {
return NULL;
}
}
memcpy(name, fullname, fullnamelen * sizeof(OID));
*namelen = fullnamelen;
*wmethod = NULL;
*varlen = sizeof(long);
switch (vp->var_magic) {
case MAG_IF_NUMBER:
return (u_char *) & if_number;
case MAG_IF_INDEX:
return (u_char *) & if_index;
case MAG_IF_DESCR:
*varlen = strlen(if_descr);
return (u_char *) if_descr;
case MAG_IF_TYPE:
return (u_char *) & if_type;
case MAG_IF_MTU:
return (u_char *) & if_mtu;
case MAG_IF_SPEED:
return (u_char *) & if_speed;
case MAG_IF_PHYSADDRESS:
*varlen = 6;
return confnet.cdn_mac;
case MAG_IF_ADMINSTATUS:
case MAG_IF_OPERSTATUS:
*wmethod = MibVarsIfSet;
return (u_char *) & if_admin_status[ifc];
case MAG_IF_LASTCHANGE:
case MAG_IF_INOCTETS:
case MAG_IF_INUCASTPKTS:
case MAG_IF_INNUCASTPKTS:
case MAG_IF_INDISCARDS:
case MAG_IF_INERRORS:
case MAG_IF_INUNKNOWNPROTOS:
case MAG_IF_OUTOCTETS:
case MAG_IF_OUTUCASTPKTS:
case MAG_IF_OUTNUCASTPKTS:
case MAG_IF_OUTDISCARDS:
case MAG_IF_OUTERRORS:
case MAG_IF_OUTQLEN:
return (u_char *) & zero;
case MAG_IF_SPECIFIC:
*varlen = sizeof(if_specific);
return (u_char *) if_specific;
}
return NULL;
}
/*!
* \brief Access the specified MIB variable.
*
* \param vp
* \param name Contains the name to look for, either exact or one that
* is in front. On return the exact name is stored here.
* \param namelen Number of sub identifiers in the name upon entry. On
* return the length of the exact name is stored here.
* \param exact If not zero, the name must match exactly. Otherwise we
* want the first name that is following the given one.
* \param varlen Size of the variable.
*/
static uint8_t *MibVarsSysGet(CONST SNMPVAR * vp, OID * name, size_t * namelen, int exact, size_t * varlen, WMETHOD ** wmethod)
{
static uint8_t empty[1];
int rc;
OID *fullname;
size_t fullnamelen = base_oidlen + vp->var_namelen + 1;
fullname = malloc(fullnamelen * sizeof(OID));
memcpy(fullname, base_oid, base_oidlen * sizeof(OID));
memcpy(fullname + base_oidlen, vp->var_name, vp->var_namelen * sizeof(OID));
*(fullname + fullnamelen - 1) = 0;
rc = SnmpOidCmp(name, *namelen, fullname, fullnamelen);
if ((exact && rc) || (!exact && rc >= 0)) {
free(fullname);
return NULL;
}
memcpy(name, fullname, fullnamelen * sizeof(OID));
free(fullname);
*namelen = fullnamelen;
*wmethod = NULL;
*varlen = sizeof(long);
switch (vp->var_magic) {
case MAG_SYS_DESCR:
*varlen = strlen(sys_descr);
return (uint8_t *) sys_descr;
case MAG_SYS_OID:
*varlen = sizeof(sys_oid);
return (uint8_t *) sys_oid;
case MAG_SYS_UPTIME:
sys_uptime = time(NULL) - sys_starttime;
sys_uptime *= 100;
return (uint8_t *) & sys_uptime;
case MAG_SYS_CONTACT:
*wmethod = MibVarsSysSet;
if (sys_contact) {
*varlen = strlen(sys_contact);
return (uint8_t *) sys_contact;
}
*varlen = 0;
return empty;
case MAG_SYS_NAME:
*wmethod = MibVarsSysSet;
if (sys_name) {
*varlen = strlen(sys_name);
return (uint8_t *) sys_name;
}
*varlen = 0;
return empty;
case MAG_SYS_LOCATION:
*wmethod = MibVarsSysSet;
if (sys_location) {
*varlen = strlen(sys_location);
return (uint8_t *) sys_location;
}
*varlen = 0;
return empty;
case MAG_SYS_SERVICES:
return (uint8_t *) & sys_services;
}
return NULL;
}
