/*
 * snmpstatus.c - send snmp GET requests to a network entity.
 *
 */
/***********************************************************************
	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
#include <stdio.h>
#include <ctype.h>
#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
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#include <getopt.h>

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

oid	objid_sysDescr[] = {1, 3, 6, 1, 2, 1, 1, 1, 0};
size_t	length_sysDescr = sizeof(objid_sysDescr)/sizeof(oid);
oid	objid_sysUpTime[] = {1, 3, 6, 1, 2, 1, 1, 3, 0};
size_t	length_sysUpTime = sizeof(objid_sysUpTime)/sizeof(oid);
oid	objid_ifOperStatus[] = {1, 3, 6, 1, 2, 1, 2, 2, 1, 8};
size_t	length_ifOperStatus = sizeof(objid_ifOperStatus)/sizeof(oid);
oid	objid_ifInUCastPkts[] = {1, 3, 6, 1, 2, 1, 2, 2, 1, 11};
size_t	length_ifInUCastPkts = sizeof(objid_ifInUCastPkts)/sizeof(oid);
oid	objid_ifInNUCastPkts[] = {1, 3, 6, 1, 2, 1, 2, 2, 1, 12};
size_t	length_ifInNUCastPkts = sizeof(objid_ifInNUCastPkts)/sizeof(oid);
oid	objid_ifOutUCastPkts[] = {1, 3, 6, 1, 2, 1, 2, 2, 1, 17};
size_t	length_ifOutUCastPkts = sizeof(objid_ifOutUCastPkts)/sizeof(oid);
oid	objid_ifOutNUCastPkts[] = {1, 3, 6, 1, 2, 1, 2, 2, 1, 18};
size_t	length_ifOutNUCastPkts = sizeof(objid_ifOutNUCastPkts)/sizeof(oid);
oid	objid_ipInReceives[] = {1, 3, 6, 1, 2, 1, 4, 3, 0};
size_t	length_ipInReceives = sizeof(objid_ipInReceives)/sizeof(oid);
oid	objid_ipOutRequests[] = {1, 3, 6, 1, 2, 1, 4, 10, 0};
size_t	length_ipOutRequests = sizeof(objid_ipOutRequests)/sizeof(oid);

#define DS_APP_DONT_FIX_PDUS 0

static void optProc(int argc, char *const *argv, int opt)
{
    switch (opt) {
        case 'C':
            while (*optarg) {
                switch (*optarg++) {
                    case 'f':
                        ds_toggle_boolean(DS_APPLICATION_ID, DS_APP_DONT_FIX_PDUS);
                        break;
		    default:
		        fprintf(stderr, "Unknown flag passed to -C: %c\n", optarg[-1]);
			exit(1);
                }
            }
            break;
    }
}

void usage(void)
{
  fprintf(stderr,"Usage: snmpstatus [-Cf]");
  snmp_parse_args_usage(stderr);
  fprintf(stderr,"\n\n");
  snmp_parse_args_descriptions(stderr);
  fprintf(stderr, "snmpstatus specific options\n");
  fprintf(stderr, "  -Cf\t\tDon't fix errors and retry the request.\n");
}


int main(int argc, char *argv[])
{
    struct snmp_session session, *ss;
    struct snmp_pdu *pdu, *response;
    struct sockaddr_in *respIp;
    struct variable_list *vars;
    char *sysdescr = NULL;
    u_long uptime = 0;
    int status;
    int ipin = 0, ipout = 0, ipackets = 0, opackets = 0;
    int good_var;
    int down_interfaces = 0;
    char buf[40];
    int interfaces;
    int count;
    int exitval = 0;

    /* get the common command line arguments */
    switch (snmp_parse_args(argc, argv, &session, "C:", &optProc)) {
    case -2:
    	exit(0);
    case -1:
        usage();
        exit(1);
    default:
        break;
    }

    SOCK_STARTUP;

    /* open an SNMP session */
    ss = snmp_open(&session);
    if (ss == NULL){
      /* diagnose snmp_open errors with the input struct snmp_session pointer */
      snmp_sess_perror("snmpstatus", &session);
      SOCK_CLEANUP;
      exit(1);
    }

    /* create PDU for GET request and add object names to request */
    pdu = snmp_pdu_create(SNMP_MSG_GET);
    snmp_add_null_var(pdu, objid_sysDescr, length_sysDescr);
    snmp_add_null_var(pdu, objid_sysUpTime, length_sysUpTime);
    snmp_add_null_var(pdu, objid_ipInReceives, length_ipInReceives);
    snmp_add_null_var(pdu, objid_ipOutRequests, length_ipOutRequests);

    /* do the request */
retry:
    status = snmp_synch_response(ss, pdu, &response);
    if (status == STAT_SUCCESS){
      if (response->errstat == SNMP_ERR_NOERROR){
        for(vars = response->variables; vars; vars = vars->next_variable){
          if (vars->name_length == length_sysDescr &&
              !memcmp(objid_sysDescr, vars->name, sizeof(objid_sysDescr))){
            sysdescr = (char*)malloc(vars->val_len+1);
            memcpy(sysdescr, vars->val.string, vars->val_len);
            sysdescr[vars->val_len] = '\0';
          }
          if (vars->name_length == length_sysUpTime &&
              !memcmp(objid_sysUpTime, vars->name, sizeof(objid_sysUpTime))){
            uptime = *vars->val.integer;
          }
          if (vars->name_length == length_ipInReceives &&
              !memcmp(objid_ipInReceives, vars->name, sizeof(objid_ipInReceives))){
            ipin = *vars->val.integer;
          }
          if (vars->name_length == length_ipOutRequests &&
              !memcmp(objid_ipOutRequests, vars->name, sizeof(objid_ipOutRequests))){
            ipout = *vars->val.integer;
          }
        }
      } else {
        fprintf(stderr, "Error in packet.\nReason: %s\n",
                snmp_errstring(response->errstat));
        if (response->errindex != 0){
          fprintf(stderr, "Failed object: ");
          for(count = 1, vars = response->variables;
                vars && count != response->errindex;
                vars = vars->next_variable, count++)
            ;
          if (vars)
            fprint_objid(stderr, vars->name, vars->name_length);
          fprintf(stderr, "\n");
        }

        /* retry if the errored variable was successfully removed */
        if (!ds_get_boolean(DS_APPLICATION_ID, DS_APP_DONT_FIX_PDUS)) {
            pdu = snmp_fix_pdu(response, SNMP_MSG_GET);
            snmp_free_pdu(response);
            response = NULL;
            if (pdu != NULL)
                goto retry;
        }
      }
    } else if (status == STAT_TIMEOUT){
      fprintf(stderr,"Timeout: No Response from %s\n", session.peername);
      SOCK_CLEANUP;
      exit(1);
    } else {    /* status == STAT_ERROR */
      snmp_sess_perror("snmpstatus", ss);
      SOCK_CLEANUP;
      exit(2);
    }

    respIp = (struct sockaddr_in *)&(response->address);
    printf("[%s]=>[%s] Up: %s\n", inet_ntoa(respIp->sin_addr),
            sysdescr, uptime_string(uptime, buf));

    if (response)
      snmp_free_pdu(response);

    /* create PDU for GET request and add object names to request */
    pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
    snmp_add_null_var(pdu, objid_ifOperStatus, length_ifOperStatus);
    snmp_add_null_var(pdu, objid_ifInUCastPkts, length_ifInUCastPkts);
    snmp_add_null_var(pdu, objid_ifInNUCastPkts, length_ifInNUCastPkts);
    snmp_add_null_var(pdu, objid_ifOutUCastPkts, length_ifOutUCastPkts);
    snmp_add_null_var(pdu, objid_ifOutNUCastPkts, length_ifOutNUCastPkts);

/*?? note: this code is not quite complete */
    good_var = 5;
    interfaces = 0;
    while(good_var == 5){
      good_var = 0;
      status = snmp_synch_response(ss, pdu, &response);
      if (status == STAT_SUCCESS){
        if (response->errstat == SNMP_ERR_NOERROR){
          pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
          for(vars = response->variables; vars; vars = vars->next_variable){
            if (vars->name_length >= length_ifOperStatus &&
                !memcmp(objid_ifOperStatus, vars->name,
                        sizeof(objid_ifOperStatus))){
              if (*vars->val.integer != MIB_IFSTATUS_UP)
                down_interfaces++;
              snmp_add_null_var(pdu, vars->name, vars->name_length);
              good_var++;
            } else if (vars->name_length >= length_ifInUCastPkts &&
                !memcmp(objid_ifInUCastPkts, vars->name,
                        sizeof(objid_ifInUCastPkts))){
              ipackets += *vars->val.integer;
              snmp_add_null_var(pdu, vars->name, vars->name_length);
              good_var++;
            } else if (vars->name_length >= length_ifInNUCastPkts &&
                !memcmp(objid_ifInNUCastPkts, vars->name,
                        sizeof(objid_ifInNUCastPkts))){
              ipackets += *vars->val.integer;
              snmp_add_null_var(pdu, vars->name, vars->name_length);
              good_var++;
            } else if (vars->name_length >= length_ifOutUCastPkts &&
                !memcmp(objid_ifOutUCastPkts, vars->name,
                        sizeof(objid_ifOutUCastPkts))){
              opackets += *vars->val.integer;
              snmp_add_null_var(pdu, vars->name, vars->name_length);
              good_var++;
            } else if (vars->name_length >= length_ifOutNUCastPkts &&
                !memcmp(objid_ifOutNUCastPkts, vars->name,
                        sizeof(objid_ifOutNUCastPkts))){
              opackets += *vars->val.integer;
              snmp_add_null_var(pdu, vars->name, vars->name_length);
              good_var++;
            }
          }
          if (good_var == 5)
            interfaces++;
        } else {
          fprintf(stderr, "Error in packet.\nReason: %s\n",
                  snmp_errstring(response->errstat));
          if (response->errindex != 0){
            fprintf(stderr, "Failed object: ");
            for(count = 1, vars = response->variables;
                  vars && count != response->errindex;
                  vars = vars->next_variable, count++)
              ;
            if (vars)
              fprint_objid(stderr, vars->name, vars->name_length);
            fprintf(stderr, "\n");
          }
	  exitval = 2;
        }
      } else if (status == STAT_TIMEOUT){
        fprintf(stderr,"Timeout: No Response from %s\n", session.peername);
	exitval = 1;
      } else {    /* status == STAT_ERROR */
        snmp_sess_perror("snmpstatus", ss);
	exitval = 1;
      }

      if (response)
        snmp_free_pdu(response);
    }
    printf("Interfaces: %d, Recv/Trans packets: %d/%d | IP: %d/%d\n",
            interfaces, ipackets, opackets, ipin, ipout);
    if (down_interfaces > 0){
      printf("%d interface%s down!\n",
            down_interfaces, down_interfaces > 1 ? "s are": " is" );
    }

    snmp_close(ss);
    SOCK_CLEANUP;
    return exitval;
}