/*
 * snmpwalk.c - send snmp GETNEXT requests to a network entity, walking a
 * subtree.
 *
 */
/**********************************************************************
	Copyright 1988, 1989, 1991, 1992 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 <config.h>

#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <sys/types.h>
#if HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#if TIME_WITH_SYS_TIME
# ifdef WIN32
#  include <sys/timeb.h>
# else
#  include <sys/time.h>
# endif
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <stdio.h>
#if HAVE_WINSOCK_H
#include <winsock.h>
#else
#include <netdb.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#include "asn1.h"
#include "snmp_api.h"
#include "snmp_client.h"
#include "mib.h"
#include "snmp.h"
#include "snmp_impl.h"
#include "system.h"
#include "snmp_parse_args.h"

oid objid_mib[] = {1, 3, 6, 1, 2, 1};

void usage(void)
{
  fprintf(stderr,"Usage:\n  snmpwalk ");
  snmp_parse_args_usage(stderr);
  fprintf(stderr," [<objectID>]\n\n");
  snmp_parse_args_descriptions(stderr);
}

int main(int argc, char *argv[])
{
    struct snmp_session  session, *ss;
    struct snmp_pdu *pdu, *response;
    struct variable_list *vars;
    int   arg;
    oid   name[MAX_OID_LEN];
    int   name_length;
    oid   root[MAX_OID_LEN];
    int   rootlen;
    int   count;
    int   running;
    int   status;
#ifdef _DEBUG_MALLOC_INC
    unsigned long histid1, histid2, orig_size, current_size;
#endif

    /* get the common command line arguments */
    arg = snmp_parse_args(argc, argv, &session);

    /* get the initial object and subtree */
    if (arg < argc) {
      /* specified on the command line */
      rootlen = MAX_OID_LEN;
      if (snmp_parse_oid(argv[arg], root, &rootlen) == NULL) {
        fprintf(stderr, "Invalid object identifier: %s\n", argv[arg]);
        exit(1);
      }
    } else {
      /* use default value */
      memmove(root, objid_mib, sizeof(objid_mib));
      rootlen = sizeof(objid_mib) / sizeof(oid);
    }
#ifdef _DEBUG_MALLOC_INC
    orig_size = malloc_inuse(&histid1);
#endif

    SOCK_STARTUP;

    /* open an SNMP session */
    snmp_synch_setup(&session);
    ss = snmp_open(&session);
    if (ss == NULL){
      snmp_perror("snmpwalk");
      SOCK_CLEANUP;
      exit(1);
    }

    /* get first object to start walk */
    memmove(name, root, rootlen * sizeof(oid));
    name_length = rootlen;

    running = 1;
    while(running){
      /* create PDU for GETNEXT request and add object name to request */
      pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
      snmp_add_null_var(pdu, name, name_length);

      /* do the request */
      status = snmp_synch_response(ss, pdu, &response);
      if (status == STAT_SUCCESS){
        if (response->errstat == SNMP_ERR_NOERROR){
          /* check resulting variables */
          for(vars = response->variables; vars; vars = vars->next_variable){
            if ((vars->name_length < rootlen) ||
                (memcmp(root, vars->name, rootlen * sizeof(oid))!=0)) {
              /* not part of this subtree */
              running = 0;
              continue;
            }
            print_variable(vars->name, vars->name_length, vars);
            if ((vars->type != SNMP_ENDOFMIBVIEW) &&
                (vars->type != SNMP_NOSUCHOBJECT) &&
                (vars->type != SNMP_NOSUCHINSTANCE)){
              /* not an exception value */
              memmove((char *)name, (char *)vars->name,
              vars->name_length * sizeof(oid));
              name_length = vars->name_length;
            } else
              /* an exception value, so stop */
              running = 0;
          }
        } else {
          /* error in response, print it */
          running = 0;
          if (response->errstat == SNMP_ERR_NOSUCHNAME){
            printf("End of MIB\n");
          } else {
            fprintf(stderr, "Error in packet.\nReason: %s\n",
		    snmp_errstring(response->errstat));
            if (response->errstat == SNMP_ERR_NOSUCHNAME){
              fprintf(stderr, "The request for this object identifier failed: ");
              for(count = 1, vars = response->variables;
                    vars && count != response->errindex;
                    vars = vars->next_variable, count++)
                /*EMPTY*/;
              if (vars)
                fprint_objid(stderr, vars->name, vars->name_length);
              fprintf(stderr, "\n");
            }
          }
        }
      } else if (status == STAT_TIMEOUT){
        fprintf(stderr, "Timeout: No Response from %s\n", session.peername);
        running = 0;
      } else {    /* status == STAT_ERROR */
        snmp_perror("snmpwalk");
        running = 0;
      }
      if (response)
        snmp_free_pdu(response);
    }
    snmp_close(ss);

#ifdef _DEBUG_MALLOC_INC
    current_size = malloc_inuse(&histid2);
    if (current_size != orig_size) malloc_list(2, histid1, histid2);
#endif

    SOCK_CLEANUP;
    exit (0);
}
