lib/snmp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* SNMP support
   3  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
   4  */
   5
   6 #include <zebra.h>
   7
   8 #include <net-snmp/net-snmp-config.h>
   9 #include <net-snmp/net-snmp-includes.h>
  10
  11 #include "smux.h"
  12
  13 int oid_compare(const oid *o1, int o1_len, const oid *o2, int o2_len)
  14 {
  15         int i;
  16
  17         for (i = 0; i < MIN(o1_len, o2_len); i++) {
  18                 if (o1[i] < o2[i])
  19                         return -1;
  20                 else if (o1[i] > o2[i])
  21                         return 1;
  22         }
  23         if (o1_len < o2_len)
  24                 return -1;
  25         if (o1_len > o2_len)
  26                 return 1;
  27
  28         return 0;
  29 }
  30
  31 void *oid_copy(void *dest, const void *src, size_t size)
  32 {
  33         return memcpy(dest, src, size * sizeof(oid));
  34 }
  35
  36 void oid2in_addr(oid oid[], int len, struct in_addr *addr)
  37 {
  38         int i;
  39         uint8_t *pnt;
  40
  41         if (len == 0)
  42                 return;
  43
  44         pnt = (uint8_t *)addr;
  45
  46         for (i = 0; i < len; i++)
  47                 *pnt++ = oid[i];
  48 }
  49
  50 void oid2in6_addr(oid oid[], struct in6_addr *addr)
  51 {
  52         unsigned int i;
  53         uint8_t *pnt;
  54
  55         pnt = (uint8_t *)addr;
  56
  57         for (i = 0; i < sizeof(struct in6_addr); i++)
  58                 *pnt++ = oid[i];
  59 }
  60
  61 void oid2int(oid oid[], int *dest)
  62 {
  63         uint8_t i;
  64         uint8_t *pnt;
  65         int network_dest;
  66
  67         pnt = (uint8_t *)&network_dest;
  68
  69         for (i = 0; i < sizeof(int); i++)
  70                 *pnt++ = oid[i];
  71         *dest = ntohl(network_dest);
  72 }
  73
  74 void oid_copy_in_addr(oid oid[], const struct in_addr *addr)
  75 {
  76         int i;
  77         const uint8_t *pnt;
  78         int len = sizeof(struct in_addr);
  79
  80         pnt = (uint8_t *)addr;
  81
  82         for (i = 0; i < len; i++)
  83                 oid[i] = *pnt++;
  84 }
  85
  86
  87 void oid_copy_in6_addr(oid oid[], const struct in6_addr *addr)
  88 {
  89         int i;
  90         const uint8_t *pnt;
  91         int len = sizeof(struct in6_addr);
  92
  93         pnt = (uint8_t *)addr;
  94
  95         for (i = 0; i < len; i++)
  96                 oid[i] = *pnt++;
  97 }
  98
  99 void oid_copy_int(oid oid[], int *val)
 100 {
 101         uint8_t i;
 102         const uint8_t *pnt;
 103         int network_val;
 104
 105         network_val = htonl(*val);
 106         pnt = (uint8_t *)&network_val;
 107
 108         for (i = 0; i < sizeof(int); i++)
 109                 oid[i] = *pnt++;
 110 }
 111
 112 void oid2string(oid oid[], int len, char *string)
 113 {
 114         int i;
 115         uint8_t *pnt;
 116
 117         if (len == 0)
 118                 return;
 119
 120         pnt = (uint8_t *)string;
 121
 122         for (i = 0; i < len; i++)
 123                 *pnt++ = (uint8_t)oid[i];
 124 }
 125
 126 void oid_copy_str(oid oid[], const char *string, int len)
 127 {
 128         int i;
 129         const uint8_t *pnt;
 130
 131         if (len == 0)
 132                 return;
 133
 134         pnt = (uint8_t *)string;
 135
 136         for (i = 0; i < len; i++)
 137                 oid[i] = *pnt++;
 138 }
 139
 140 int smux_header_generic(struct variable *v, oid *name, size_t *length,
 141                         int exact, size_t *var_len, WriteMethod **write_method)
 142 {
 143         oid fulloid[MAX_OID_LEN];
 144         int ret;
 145
 146         oid_copy(fulloid, v->name, v->namelen);
 147         fulloid[v->namelen] = 0;
 148         /* Check against full instance. */
 149         ret = oid_compare(name, *length, fulloid, v->namelen + 1);
 150
 151         /* Check single instance. */
 152         if ((exact && (ret != 0)) || (!exact && (ret >= 0)))
 153                 return MATCH_FAILED;
 154
 155         /* In case of getnext, fill in full instance. */
 156         memcpy(name, fulloid, (v->namelen + 1) * sizeof(oid));
 157         *length = v->namelen + 1;
 158
 159         *write_method = 0;
 160         *var_len = sizeof(long); /* default to 'long' results */
 161
 162         return MATCH_SUCCEEDED;
 163 }
 164
 165 int smux_header_table(struct variable *v, oid *name, size_t *length, int exact,
 166                       size_t *var_len, WriteMethod **write_method)
 167 {
 168         /* If the requested OID name is less than OID prefix we
 169            handle, adjust it to our prefix. */
 170         if ((oid_compare(name, *length, v->name, v->namelen)) < 0) {
 171                 if (exact)
 172                         return MATCH_FAILED;
 173                 oid_copy(name, v->name, v->namelen);
 174                 *length = v->namelen;
 175         }
 176
 177         *write_method = 0;
 178         *var_len = sizeof(long);
 179
 180         return MATCH_SUCCEEDED;
 181 }