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/*
* Copyright (C) 1996-2025 The Squid Software Foundation and contributors
*
* Squid software is distributed under GPLv2+ license and includes
* contributions from numerous individuals and organizations.
* Please see the COPYING and CONTRIBUTORS files for details.
*/
/**********************************************************************
*
* Copyright 1997 by Carnegie Mellon University
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of CMU not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
*
* CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
* CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*
**********************************************************************/
#include "squid.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_CTYPE_H
#include <ctype.h>
#endif
#if HAVE_GNUMALLOC_H
#include <gnumalloc.h>
#elif HAVE_MALLOC_H
#include <malloc.h>
#endif
#if HAVE_MEMORY_H
#include <memory.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_STRINGS_H
#include <strings.h>
#endif
#if HAVE_BSTRING_H
#include <bstring.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include "asn1.h"
#include "snmp.h"
#include "snmp-internal.h"
#include "snmp_error.h"
#include "snmp_impl.h"
#include "snmp_msg.h"
#include "snmp_pdu.h"
#include "snmp_session.h"
#include "snmp_vars.h"
#include "snmp_api.h"
#include "snmp_api_error.h"
#include "snmp_api_util.h"
#include "util.h"
/**********************************************************************/
/*
* Takes a session and a pdu and serializes the ASN PDU into the area
* pointed to by packet. out_length is the size of the data area available.
* Returns the length of the encoded packet in out_length. If an error
* occurs, -1 is returned. If all goes well, 0 is returned.
*/
int
snmp_build(struct snmp_session *session, struct snmp_pdu *pdu, u_char *packet, int *out_length)
{
u_char *bufp;
bufp = snmp_msg_Encode(packet, out_length,
session->community, session->community_len,
session->Version,
pdu);
snmplib_debug(8, "LIBSNMP: snmp_build(): Packet len %d (requid %d)\n",
*out_length, pdu->reqid);
if (bufp == NULL)
return (-1);
return (0);
}
/*
* Parses the packet received on the input session, and places the data into
* the input pdu. length is the length of the input packet. If any errors
* are encountered, NULL is returned. If not, the community is.
*/
u_char *
snmp_parse(struct snmp_session * session,
struct snmp_pdu * pdu,
u_char * data,
int length)
{
u_char Community[128];
u_char *bufp;
int CommunityLen = 128;
/* Decode the entire message. */
data = snmp_msg_Decode(data, &length,
Community, &CommunityLen,
&session->Version, pdu);
if (data == NULL)
return (NULL);
bufp = (u_char *) xmalloc(CommunityLen + 1);
if (bufp == NULL)
return (NULL);
strncpy((char *) bufp, (char *) Community, CommunityLen);
bufp[CommunityLen] = '\0';
session->community = bufp;
session->community_len = CommunityLen;
return (bufp);
}
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