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Most table handlers do not expect to be given an OID whose prefix is outside what they can handle. This is not a problem with the SMUX implementation since it always correct the OID such that the prefix matches. However, this is not the case for the AgentX implementation. A new function, smux_header_table() is used to do this normalization.
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/* SNMP support
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* Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Zebra; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <zebra.h>
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#ifdef HAVE_SNMP
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#include <net-snmp/net-snmp-config.h>
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#include <net-snmp/net-snmp-includes.h>
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#include "smux.h"
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#define min(A,B) ((A) < (B) ? (A) : (B))
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int
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oid_compare (oid *o1, int o1_len, oid *o2, int o2_len)
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{
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int i;
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for (i = 0; i < min (o1_len, o2_len); i++)
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{
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if (o1[i] < o2[i])
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return -1;
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else if (o1[i] > o2[i])
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return 1;
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}
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if (o1_len < o2_len)
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return -1;
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if (o1_len > o2_len)
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return 1;
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return 0;
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}
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void *
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oid_copy (void *dest, const void *src, size_t size)
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{
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return memcpy (dest, src, size * sizeof (oid));
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}
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void
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oid2in_addr (oid oid[], int len, struct in_addr *addr)
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{
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int i;
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u_char *pnt;
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if (len == 0)
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return;
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pnt = (u_char *) addr;
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for (i = 0; i < len; i++)
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*pnt++ = oid[i];
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}
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void
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oid_copy_addr (oid oid[], struct in_addr *addr, int len)
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{
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int i;
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u_char *pnt;
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if (len == 0)
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return;
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pnt = (u_char *) addr;
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for (i = 0; i < len; i++)
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oid[i] = *pnt++;
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}
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int
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smux_header_generic (struct variable *v, oid *name, size_t *length, int exact,
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size_t *var_len, WriteMethod **write_method)
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{
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oid fulloid[MAX_OID_LEN];
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int ret;
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oid_copy (fulloid, v->name, v->namelen);
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fulloid[v->namelen] = 0;
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/* Check against full instance. */
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ret = oid_compare (name, *length, fulloid, v->namelen + 1);
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/* Check single instance. */
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if ((exact && (ret != 0)) || (!exact && (ret >= 0)))
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return MATCH_FAILED;
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/* In case of getnext, fill in full instance. */
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memcpy (name, fulloid, (v->namelen + 1) * sizeof (oid));
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*length = v->namelen + 1;
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*write_method = 0;
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*var_len = sizeof(long); /* default to 'long' results */
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return MATCH_SUCCEEDED;
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}
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int
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smux_header_table (struct variable *v, oid *name, size_t *length, int exact,
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size_t *var_len, WriteMethod **write_method)
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{
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/* If the requested OID name is less than OID prefix we
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handle, adjust it to our prefix. */
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if ((oid_compare (name, *length, v->name, v->namelen)) < 0)
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{
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if (exact)
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return MATCH_FAILED;
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oid_copy(name, v->name, v->namelen);
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*length = v->namelen;
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}
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*write_method = 0;
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*var_len = sizeof(long);
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return MATCH_SUCCEEDED;
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}
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#endif /* HAVE_SNMP */
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