/*
 * snmpget.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 "asn1.h"
#include "snmp_api.h"
#include "snmp_impl.h"
#include "snmp_client.h"
#include "mib.h"
#include "snmp.h"
#include "system.h"
#include "snmp_parse_args.h"
#include "snmp_debug.h"
#include "tools.h"
#include "getopt.h"

int failures=0;

void
usage (void)
{
  fprintf(stderr,"Usage: snmpdf [-Cu] ");
  snmp_parse_args_usage(stderr);
  fprintf(stderr,"\n\n");
  snmp_parse_args_descriptions(stderr);
  fprintf(stderr, "\nsnmpdf options:\n");
  fprintf(stderr, "\t-Cu\tUse UCD-SNMP dskTable to do the calculations.\n");
  fprintf(stderr, "\t\t[Normally the HOST-RESOURCES-MIB is consulted first.]\n");
}

int ucd_mib = 0;

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

struct hrStorageTable {
   u_long  hrStorageIndex;
   oid    *hrStorageType;
   char   *hrStorageDescr;
   u_long  hrStorageAllocationUnits;
   u_long  hrStorageSize;
   u_long  hrStorageUsed;
};

int add(struct snmp_pdu *pdu, const char *mibnodename,
        oid *index, size_t indexlen) {
    oid base[MAX_OID_LEN];
    size_t base_length = MAX_OID_LEN;

    memset(base,0,MAX_OID_LEN*sizeof(oid));
    
    if (!snmp_parse_oid(mibnodename, base, &base_length)) {
        snmp_perror(mibnodename);
        fprintf(stderr,"couldn't find mib node %s, giving up\n",mibnodename);
        exit(1);
    }

    if (index && indexlen) {
        memcpy(&(base[base_length]), index, indexlen*sizeof(oid));
        base_length += indexlen;
    }
    DEBUGMSGTL(("add", "created: "));
    DEBUGMSGOID(("add", base, base_length));
    DEBUGMSG(("add", "\n"));
    snmp_add_null_var(pdu, base, base_length);

    return base_length;
}

struct variable_list *
collect(struct snmp_session *ss, struct snmp_pdu *pdu,
        oid *base, size_t base_length) {
    struct snmp_pdu *response;
    int running = 1;
    struct variable_list *saved = NULL, **vlpp = &saved;
    int status;

    while(running) {
        /* gotta catch em all, gotta catch em all! */
        status = snmp_synch_response(ss, pdu, &response);
        if (status != STAT_SUCCESS || !response) {
            snmp_sess_perror("snmpdf", ss);
            exit(1);
        }
        if (response && snmp_oid_compare(response->variables->name,
                                         SNMP_MIN(base_length, response->variables->name_length),
                                         base, base_length) != 0)
            running = 0;
        else {
            /* get response */
            *vlpp = response->variables;
            (*vlpp)->next_variable = NULL; /* shouldn't be any, but just in case */

            /* create the next request */
            pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
            snmp_add_null_var(pdu, (*vlpp)->name, (*vlpp)->name_length);

            /* finish loop setup */
            vlpp = &((*vlpp)->next_variable);
            response->variables = NULL; /* ahh, forget about it */
        }
        snmp_free_pdu(response);
    }
    return saved;
}

     

int main(int argc, char *argv[])
{
    struct snmp_session session, *ss;
    struct snmp_pdu *pdu;
    struct snmp_pdu *response;
    int arg;
    oid base[MAX_OID_LEN];
    size_t base_length;
    int status;
    struct variable_list *saved = NULL, *vlp = saved, *vlp2;
    int count = 0;
    
    /* get the common command line arguments */
    switch (arg = 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("snmpget", &session);
      SOCK_CLEANUP;
      exit(1);
    }

    printf("%-18s %15s %15s %15s %5s\n","Description", "size (kB)", "Used",
           "Available", "Used%");
    if (ucd_mib == 0) {
        /*
     * Begin by finding all the storage pieces that are of
     * type hrStorageFixedDisk, which is a standard disk.
     */
        pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
        base_length = add(pdu, "HOST-RESOURCES-MIB:hrStorageIndex", NULL, 0);
        memcpy(base, pdu->variables->name, base_length*sizeof(oid));

        vlp = collect(ss, pdu, base, base_length);

        while(vlp) {
            size_t units;
            unsigned long hssize, hsused;
            char descr[SPRINT_MAX_LEN];
        
            pdu = snmp_pdu_create(SNMP_MSG_GET);

            add(pdu, "HOST-RESOURCES-MIB:hrStorageDescr",
                &(vlp->name[base_length]), vlp->name_length - base_length);
            add(pdu, "HOST-RESOURCES-MIB:hrStorageAllocationUnits",
                &(vlp->name[base_length]), vlp->name_length - base_length);
            add(pdu, "HOST-RESOURCES-MIB:hrStorageSize",
                &(vlp->name[base_length]), vlp->name_length - base_length);
            add(pdu, "HOST-RESOURCES-MIB:hrStorageUsed",
                &(vlp->name[base_length]), vlp->name_length - base_length);
        
            status = snmp_synch_response(ss, pdu, &response);
            if (status != STAT_SUCCESS || !response) {
                snmp_sess_perror("snmpdf", ss);
                exit(1);
            }

            vlp2 = response->variables;
            memcpy(descr, vlp2->val.string, vlp2->val_len);
            descr[vlp2->val_len] = '\0';

            vlp2 = vlp2->next_variable;
            units = vlp2->val.integer ? *(vlp2->val.integer) : 0;

            vlp2 = vlp2->next_variable;
            hssize = vlp2->val.integer ? *(vlp2->val.integer) : 0;

            vlp2 = vlp2->next_variable;
            hsused = vlp2->val.integer ? *(vlp2->val.integer) : 0;

            printf("%-18s %15lu %15lu %15lu %4lu%%\n", descr,
                   units ? hssize*(units/1024) : hssize,
		   units ? hsused*(units/1024) : hsused,
                   units ? (hssize-hsused)*(units/1024) : hssize-hsused,
		   hssize ? 100*hsused/hssize : hsused);

            vlp = vlp->next_variable;
            snmp_free_pdu(response);
            count++;
        }
    }

    if (count == 0) {
        size_t units = 0;
        /* the host resources mib must not be supported.  Lets try the
           UCD-SNMP-MIB and its dskTable */

        pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
        base_length = add(pdu, "UCD-SNMP-MIB:dskIndex", NULL, 0);
        memcpy(base, pdu->variables->name, base_length*sizeof(oid));

        vlp = collect(ss, pdu, base, base_length);

        while(vlp) {
            unsigned long hssize, hsused;
            char descr[SPRINT_MAX_LEN];
        
            pdu = snmp_pdu_create(SNMP_MSG_GET);

            add(pdu, "UCD-SNMP-MIB:dskPath",
                &(vlp->name[base_length]), vlp->name_length - base_length);
            add(pdu, "UCD-SNMP-MIB:dskTotal",
                &(vlp->name[base_length]), vlp->name_length - base_length);
            add(pdu, "UCD-SNMP-MIB:dskUsed",
                &(vlp->name[base_length]), vlp->name_length - base_length);
        
            status = snmp_synch_response(ss, pdu, &response);
            if (status != STAT_SUCCESS || !response) {
                snmp_sess_perror("snmpdf", ss);
                exit(1);
            }

            vlp2 = response->variables;
            memcpy(descr, vlp2->val.string, vlp2->val_len);
            descr[vlp2->val_len] = '\0';

            vlp2 = vlp2->next_variable;
            hssize = *(vlp2->val.integer);

            vlp2 = vlp2->next_variable;
            hsused = *(vlp2->val.integer);

            printf("%-18s %15lu %15lu %15lu %4lu%%\n", descr,
                   units ? hssize*(units/1024) : hssize,
		   units ? hsused*(units/1024) : hsused,
                   units ? (hssize-hsused)*(units/1024) : hssize-hsused,
		   hssize ? 100*hsused/hssize : hsused);

            vlp = vlp->next_variable;
            snmp_free_pdu(response);
            count++;
        }
    }
    
    if (count == 0) {
        fprintf(stderr, "Failed to locate any partions.\n");
        exit(1);
    }
            
    snmp_close(ss);
    SOCK_CLEANUP;
    return 0;

}  /* end main() */