release/src/router/snmp/apps/snmpget.c

   1 /*
   2  * snmpget.c - send snmp GET requests to a network entity.
   3  *
   4  */
   5 /***********************************************************************
   6         Copyright 1988, 1989, 1991, 1992 by Carnegie Mellon University
   7
   8                       All Rights Reserved
   9
  10 Permission to use, copy, modify, and distribute this software and its
  11 documentation for any purpose and without fee is hereby granted,
  12 provided that the above copyright notice appear in all copies and that
  13 both that copyright notice and this permission notice appear in
  14 supporting documentation, and that the name of CMU not be
  15 used in advertising or publicity pertaining to distribution of the
  16 software without specific, written prior permission.
  17
  18 CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  19 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  20 CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  21 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  22 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  23 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  24 SOFTWARE.
  25 ******************************************************************/
  26 #include <net-snmp/net-snmp-config.h>
  27
  28 #if HAVE_STDLIB_H
  29 #include <stdlib.h>
  30 #endif
  31 #if HAVE_UNISTD_H
  32 #include <unistd.h>
  33 #endif
  34 #if HAVE_STRING_H
  35 #include <string.h>
  36 #else
  37 #include <strings.h>
  38 #endif
  39 #include <sys/types.h>
  40 #if HAVE_NETINET_IN_H
  41 #include <netinet/in.h>
  42 #endif
  43 #include <stdio.h>
  44 #include <ctype.h>
  45 #if TIME_WITH_SYS_TIME
  46 # ifdef WIN32
  47 #  include <sys/timeb.h>
  48 # else
  49 #  include <sys/time.h>
  50 # endif
  51 # include <time.h>
  52 #else
  53 # if HAVE_SYS_TIME_H
  54 #  include <sys/time.h>
  55 # else
  56 #  include <time.h>
  57 # endif
  58 #endif
  59 #if HAVE_SYS_SELECT_H
  60 #include <sys/select.h>
  61 #endif
  62 #if HAVE_WINSOCK_H
  63 #include <winsock.h>
  64 #endif
  65 #if HAVE_NETDB_H
  66 #include <netdb.h>
  67 #endif
  68 #if HAVE_ARPA_INET_H
  69 #include <arpa/inet.h>
  70 #endif
  71
  72 #include <net-snmp/utilities.h>
  73
  74 #include <net-snmp/net-snmp-includes.h>
  75
  76 int             failures = 0;
  77
  78 #define NETSNMP_DS_APP_DONT_FIX_PDUS 0
  79
  80 static void
  81 optProc(int argc, char *const *argv, int opt)
  82 {
  83     switch (opt) {
  84     case 'C':
  85         while (*optarg) {
  86             switch (*optarg++) {
  87             case 'f':
  88                 netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID,
  89                                           NETSNMP_DS_APP_DONT_FIX_PDUS);
  90                 break;
  91             default:
  92                 fprintf(stderr, "Unknown flag passed to -C: %c\n",
  93                         optarg[-1]);
  94                 exit(1);
  95             }
  96         }
  97         break;
  98     }
  99 }
 100
 101 void
 102 usage(void)
 103 {
 104     fprintf(stderr, "USAGE: snmpget ");
 105     snmp_parse_args_usage(stderr);
 106     fprintf(stderr, " OID [OID]...\n\n");
 107     snmp_parse_args_descriptions(stderr);
 108     fprintf(stderr,
 109             "  -C APPOPTS\t\tSet various application specific behaviours:\n");
 110     fprintf(stderr,
 111             "\t\t\t  f:  do not fix errors and retry the request\n");
 112 }
 113
 114 int
 115 main(int argc, char *argv[])
 116 {
 117     netsnmp_session session, *ss;
 118     netsnmp_pdu    *pdu;
 119     netsnmp_pdu    *response;
 120     netsnmp_variable_list *vars;
 121     int             arg;
 122     int             count;
 123     int             current_name = 0;
 124     char           *names[128];
 125     oid             name[MAX_OID_LEN];
 126     size_t          name_length;
 127     int             status;
 128     int             exitval = 0;
 129
 130     /*
 131      * get the common command line arguments
 132      */
 133     switch (arg = snmp_parse_args(argc, argv, &session, "C:", optProc)) {
 134     case -2:
 135         exit(0);
 136     case -1:
 137         usage();
 138         exit(1);
 139     default:
 140         break;
 141     }
 142
 143     if (arg >= argc) {
 144         fprintf(stderr, "Missing object name\n");
 145         usage();
 146         exit(1);
 147     }
 148
 149     /*
 150      * get the object names
 151      */
 152     for (; arg < argc; arg++)
 153         names[current_name++] = argv[arg];
 154
 155     SOCK_STARTUP;
 156
 157
 158     /*
 159      * Open an SNMP session.
 160      */
 161     ss = snmp_open(&session);
 162     if (ss == NULL) {
 163         /*
 164          * diagnose snmp_open errors with the input netsnmp_session pointer
 165          */
 166         snmp_sess_perror("snmpget", &session);
 167         SOCK_CLEANUP;
 168         exit(1);
 169     }
 170
 171
 172     /*
 173      * Create PDU for GET request and add object names to request.
 174      */
 175     pdu = snmp_pdu_create(SNMP_MSG_GET);
 176     for (count = 0; count < current_name; count++) {
 177         name_length = MAX_OID_LEN;
 178         if (!snmp_parse_oid(names[count], name, &name_length)) {
 179             snmp_perror(names[count]);
 180             failures++;
 181         } else
 182             snmp_add_null_var(pdu, name, name_length);
 183     }
 184     if (failures) {
 185         SOCK_CLEANUP;
 186         exit(1);
 187     }
 188
 189
 190     /*
 191      * Perform the request.
 192      *
 193      * If the Get Request fails, note the OID that caused the error,
 194      * "fix" the PDU (removing the error-prone OID) and retry.
 195      */
 196   retry:
 197     status = snmp_synch_response(ss, pdu, &response);
 198     if (status == STAT_SUCCESS) {
 199         if (response->errstat == SNMP_ERR_NOERROR) {
 200             for (vars = response->variables; vars;
 201                  vars = vars->next_variable)
 202                 print_variable(vars->name, vars->name_length, vars);
 203
 204         } else {
 205             fprintf(stderr, "Error in packet\nReason: %s\n",
 206                     snmp_errstring(response->errstat));
 207
 208             if (response->errindex != 0) {
 209                 fprintf(stderr, "Failed object: ");
 210                 for (count = 1, vars = response->variables;
 211                      vars && count != response->errindex;
 212                      vars = vars->next_variable, count++)
 213                     /*EMPTY*/;
 214                 if (vars) {
 215                     fprint_objid(stderr, vars->name, vars->name_length);
 216                 }
 217                 fprintf(stderr, "\n");
 218             }
 219             exitval = 2;
 220
 221             /*
 222              * retry if the errored variable was successfully removed
 223              */
 224             if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
 225                                         NETSNMP_DS_APP_DONT_FIX_PDUS)) {
 226                 pdu = snmp_fix_pdu(response, SNMP_MSG_GET);
 227                 snmp_free_pdu(response);
 228                 response = NULL;
 229                 if (pdu != NULL) {
 230                     goto retry;
 231                 }
 232             }
 233         }                       /* endif -- SNMP_ERR_NOERROR */
 234
 235     } else if (status == STAT_TIMEOUT) {
 236         fprintf(stderr, "Timeout: No Response from %s.\n",
 237                 session.peername);
 238         exitval = 1;
 239
 240     } else {                    /* status == STAT_ERROR */
 241         snmp_sess_perror("snmpget", ss);
 242         exitval = 1;
 243
 244     }                           /* endif -- STAT_SUCCESS */
 245
 246
 247     if (response)
 248         snmp_free_pdu(response);
 249     snmp_close(ss);
 250     SOCK_CLEANUP;
 251     return exitval;
 252
 253 }                               /* end main() */