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/** allows overriding of a given oid with a new type and value */
/* Portions of this file are subject to the following copyright(s). See
* the Net-SNMP's COPYING file for more details and other copyrights
* that may apply:
*/
/*
* Portions of this file are copyrighted by:
* Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms specified in the COPYING file
* distributed with the Net-SNMP package.
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
typedef struct override_data_s {
int type;
void *value;
size_t value_len;
void *set_space;
size_t set_len;
} override_data;
/** @todo: (optionally) save values persistently when configured for
* read-write */
int
override_handler(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
override_data *data = (override_data*)handler->myvoid;
void *tmpptr;
if (!data) {
netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_GENERR);
return SNMP_ERR_NOERROR;
}
switch (reqinfo->mode) {
case MODE_GET:
DEBUGMSGTL(("override", "overriding oid "));
DEBUGMSGOID(("override", requests->requestvb->name,
requests->requestvb->name_length));
DEBUGMSG(("override", "\n"));
snmp_set_var_typed_value(requests->requestvb, (u_char)data->type,
(u_char *) data->value, data->value_len);
break;
#ifndef NETSNMP_NO_WRITE_SUPPORT
case MODE_SET_RESERVE1:
if (requests->requestvb->type != data->type)
netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_WRONGTYPE);
break;
case MODE_SET_RESERVE2:
if (memdup((u_char **) &data->set_space,
requests->requestvb->val.string,
requests->requestvb->val_len) == SNMPERR_GENERR)
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_RESOURCEUNAVAILABLE);
break;
case MODE_SET_FREE:
SNMP_FREE(data->set_space);
break;
case MODE_SET_ACTION:
/* swap the values in */
tmpptr = data->value;
data->value = data->set_space;
data->set_space = tmpptr;
/* set the lengths */
data->set_len = data->value_len;
data->value_len = requests->requestvb->val_len;
break;
case MODE_SET_UNDO:
SNMP_FREE(data->value);
data->value = data->set_space;
data->value_len = data->set_len;
break;
case MODE_SET_COMMIT:
SNMP_FREE(data->set_space);
break;
#endif /* !NETSNMP_NO_WRITE_SUPPORT */
default:
snmp_log(LOG_ERR, "unsupported mode in override handler\n");
netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_GENERR);
return SNMP_ERR_GENERR;
}
return SNMP_ERR_NOERROR;
}
#define MALLOC_OR_DIE(x) \
thedata->value = malloc(x); \
thedata->value_len = x; \
if (!thedata->value) { \
free(thedata); \
config_perror("memory allocation failure"); \
return; \
}
void
netsnmp_parse_override(const char *token, char *line)
{
char *cp;
char buf[SNMP_MAXBUF], namebuf[SNMP_MAXBUF];
int readwrite = 0;
oid oidbuf[MAX_OID_LEN];
size_t oidbuf_len = MAX_OID_LEN;
int type;
override_data *thedata;
netsnmp_handler_registration *the_reg;
cp = copy_nword(line, namebuf, sizeof(namebuf) - 1);
if (strcmp(namebuf, "-rw") == 0) {
readwrite = 1;
cp = copy_nword(cp, namebuf, sizeof(namebuf) - 1);
}
if (!cp) {
config_perror("no oid specified");
return;
}
if (!snmp_parse_oid(namebuf, oidbuf, &oidbuf_len)) {
config_perror("illegal oid");
return;
}
cp = copy_nword(cp, buf, sizeof(buf) - 1);
if (!cp && strcmp(buf, "null") != 0) {
config_perror("no variable value specified");
return;
}
{
struct { const char* key; int value; } const strings[] = {
{ "counter", ASN_COUNTER },
{ "counter64", ASN_COUNTER64 },
{ "integer", ASN_INTEGER },
{ "ipaddress", ASN_IPADDRESS },
{ "nsap", ASN_NSAP },
{ "null", ASN_NULL },
{ "object_id", ASN_OBJECT_ID },
{ "octet_str", ASN_OCTET_STR },
{ "opaque", ASN_OPAQUE },
#ifdef NETSNMP_WITH_OPAQUE_SPECIAL_TYPES
{ "opaque_counter64", ASN_OPAQUE_COUNTER64 },
{ "opaque_double", ASN_OPAQUE_DOUBLE },
{ "opaque_float", ASN_OPAQUE_FLOAT },
{ "opaque_i64", ASN_OPAQUE_I64 },
{ "opaque_u64", ASN_OPAQUE_U64 },
#endif
{ "timeticks", ASN_TIMETICKS },
{ "uinteger", ASN_GAUGE },
{ "unsigned", ASN_UNSIGNED },
{ NULL, 0 }
}, * run;
for(run = strings; run->key && strcasecmp(run->key, buf) < 0; ++run);
if(run->key && strcasecmp(run->key, buf) == 0)
type = run->value;
else {
config_perror("unknown type specified");
return;
}
}
if (cp)
copy_nword(cp, buf, sizeof(buf) - 1);
else
buf[0] = 0;
thedata = SNMP_MALLOC_TYPEDEF(override_data);
if (!thedata) {
config_perror("memory allocation failure");
return;
}
thedata->type = type;
switch (type) {
case ASN_INTEGER:
MALLOC_OR_DIE(sizeof(long));
*((long *) thedata->value) = strtol(buf, NULL, 0);
break;
case ASN_COUNTER:
case ASN_TIMETICKS:
case ASN_UNSIGNED:
MALLOC_OR_DIE(sizeof(u_long));
*((u_long *) thedata->value) = strtoul(buf, NULL, 0);
break;
case ASN_OCTET_STR:
case ASN_BIT_STR:
if (buf[0] == '0' && buf[1] == 'x') {
/*
* hex
*/
thedata->value_len =
hex_to_binary2((u_char *)(buf + 2), strlen(buf) - 2,
(char **) &thedata->value);
} else {
thedata->value = strdup(buf);
thedata->value_len = strlen(buf);
}
break;
case ASN_OBJECT_ID:
read_config_read_objid(buf, (oid **) & thedata->value,
&thedata->value_len);
/* We need the size of the value in bytes, not in oids */
thedata->value_len *= sizeof(oid);
break;
case ASN_NULL:
thedata->value_len = 0;
break;
default:
SNMP_FREE(thedata);
config_perror("illegal/unsupported type specified");
return;
}
if (!thedata->value && thedata->type != ASN_NULL) {
config_perror("memory allocation failure");
free(thedata);
return;
}
the_reg = SNMP_MALLOC_TYPEDEF(netsnmp_handler_registration);
if (!the_reg) {
config_perror("memory allocation failure");
free(thedata);
return;
}
the_reg->handlerName = strdup(namebuf);
the_reg->priority = 255;
the_reg->modes = (readwrite) ? HANDLER_CAN_RWRITE : HANDLER_CAN_RONLY;
the_reg->handler =
netsnmp_create_handler("override", override_handler);
the_reg->rootoid = snmp_duplicate_objid(oidbuf, oidbuf_len);
the_reg->rootoid_len = oidbuf_len;
if (!the_reg->rootoid || !the_reg->handler || !the_reg->handlerName) {
if (the_reg->handler)
SNMP_FREE(the_reg->handler->handler_name);
SNMP_FREE(the_reg->handler);
SNMP_FREE(the_reg->handlerName);
SNMP_FREE(the_reg);
config_perror("memory allocation failure");
free(thedata);
return;
}
the_reg->handler->myvoid = thedata;
if (netsnmp_register_instance(the_reg)) {
config_perror("oid registration failed within the agent");
SNMP_FREE(thedata->value);
free(thedata);
return;
}
}
void
init_override(void)
{
snmpd_register_config_handler("override", netsnmp_parse_override, NULL, /* XXX: free func */
"[-rw] mibnode type value");
}
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