typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned int uint32;
typedef signed char sint8;
typedef signed short sint16;
typedef signed int sint32;
#define MAXOID 20
#define MAXKEY 4
#define MAXKLEN 22
#define MAXVAR 60
#define scompare(a, b) strcmp((const char *)a, (const char *)b)
#define sncompare(a, b, c) strncmp((const char *)a, (const char *)b, c)
#define slength(a) strlen((const char *)a)
#define scopy(a, b) strcpy((char *)a, (const char *)b)
#define sncopy(a, b, c) strncpy((char *)a, (const char *)b, c)
#define Integer 0x02ul
#define String 0x04ul
#define Null 0x05ul
#define Identifier 0x06ul
#define OctetString 0x14ul
#define Sequence 0x30ul
#define IpAddress 0x40ul
#define Counter 0x41ul
#define Counter32 0x41ul
#define Gauge 0x42ul
#define Ticks 0x43ul
#define GetRequest 0xa0ul
#define GetNextRequest 0xa1ul
#define GetResponse 0xa2ul
#define TrapV1 0xa4ul
#define SetRequest 0xa3ul
#define GetBulkRequest 0xa5ul
#define Trap 0xa7ul
#define Report 0xa8ul
/* Version 2 error values */
#define tooBig 1
#define noSuchName 2
#define badValue 3
#define readOnly 4
#define genErr 5
#define noAccess 6
#define wrongType 7
#define wrongLength 8
#define wrongEncoding 9
#define wrongValue 10
#define noCreation 11
#define inconsistentValue 12
#define resourceUnavailable 13
#define commitFailed 14
#define undoFailed 15
#define authorizationError 16
#define notWritable 17
#define inconsistentName 18
#define IMMED 0x01 /* Immediate value in mvp->len */
#define IMMED2 0x02 /* Immediate value in mvp->type + len */
#define BASE1 0x03 /* Base 0 in data space, base 1 in MIB */
#define SCALAR 0x04 /* Table not indexed (no offset) */
#define W 0x08 /* Write allowed */
#define SX 0x10 /* Sequential table index inferred */
#define NWORDER 0x20 /* Network byte ordering for basic type */
#define CAR 0x40 /* Call application after read */
#define CAW 0x80 /* Call application before write */
/* VACM return values */
#define accessAllowed 0
#define noSuchContext 1
struct COUNTER64
{
uint32 hi, lo;
};
typedef struct
{
uint8 nlen, name[MAXOID];
} OID;
typedef struct
{
OID oid; /* Object ID name and length */
uint16 ix; /* Index values (offsets) */
uint16 len; /* Length of table */
void *empty; /* empty flag */
} MIBTAB;
typedef struct
{
OID oid; /* Object ID name and length */
uint16 opt; /* Options (with choice) */
uint8 type; /* Type of variable */
sint16 len; /* Length of pointer field */
void *ptr; /* Pointer to possible variable data */
} MIBVAR;
/* Define SNMP access to a particular MIB */
typedef struct
{
const MIBVAR *mvp; /* MIB variables */
sint16 (*numvars)(void); /* Number of variables */
const MIBTAB *mtp; /* MIB tables */
sint16 (*numtabs)(void); /* Number of tables */
void (*get)(sint16 varix, sint16 tabix, uint8 **vvptr);
sint16 (*set)(sint16 varix, sint16 tabix);
sint16 (*index)(sint16 varix, sint16 index);
void (*init)(uint16 type); /* Initialize the MIB */
sint16 (*check)(sint16 varix, sint16 tabix, const uint8 *inp);
} MIB;
typedef struct
{
const MIB **mibs; /* Array of pointers to host MIBs */
uint16 nummibs; /* Number of host MIBs */
uint16 trapv; /* Trap version and startup trap type */
} AGENT_CONTEXT;
/* Function prototypes */
void snmpInit(void);
void SnmpRefresh(void);
sint16 inReqOutRep(uint8 **obp, uint16 olen, const uint8 *ibp, uint16 ilen);
/* Mid-level API */
sint16 ussSNMPAgentInit(const AGENT_CONTEXT *ac);
sint16 ussSNMPAgentTrap(uint8 type, uint8 spec, unsigned char*contextName,
const uint8 *vbs, uint16 len);
/* Utility */
void snmpEncodeIndex(uint8 **pp, const MIB *mibp, const MIBTAB *mtp,
sint16 tabix);
sint32 snmpVCompare(const uint8 *op1, sint16 len1, const uint8 *op2, sint16 len2);
sint32 snmpFindOID(const uint8 **retp, const uint8 *base, sint16 osize,
sint16 onum, const uint8 *valp, sint16 vlen);
sint32 snmpFindIndex(sint16 *tabixp, const MIBTAB *mtp,
const MIB *mibp, const MIBVAR *mvp,
const uint8 *reqixname, uint8 reqixlen, uint8 nflag);
void snmpEncodeID(uint8 **pp, uint8 olen, uint32 val);
sint16 snmpReadLength(const uint8 **pp, uint16 type);
sint16 snmpReadInt(uint32 *outp, uint8 olen, const uint8 **inp, uint16 type);
sint16 snmpReadVal(uint8 *outp, uint8 olen, const uint8 **inp, uint16 type);
void snmpRWriteLength(uint8 **pp, uint16 type, sint16 len);
void snmpRWriteInt(uint8 **pp, uint32 val, uint16 type, sint16 len);
void snmpRWriteVal(uint8 **pp, const uint8 *vp, uint16 type, sint16 len);
/* VACM module */
sint16 isAccessAllowed(const uint8 *contextName);
// snmpFindIndex() Find a table entry index
sint32 snmpFindIndex(sint16 *tabixp, const MIBTAB *mtp,
const MIB *mibp, const MIBVAR *mvp,
const uint8 *reqixname, uint8 reqixlen, uint8 nflag)
{
uint8 *cp;
sint32 sl1, sl2;
sint16 i1, i3;
uint8 ixname[MAXKLEN];
/* Default return values */
*tabixp = -1;
sl2 = 0;
/* Search through each table entry's index for the element */
for (i1 = 0; ; i1++)
{
i3 = mibp->index(mvp - mibp->mvp, i1);
if (i3 < 0)
break; /* -1 -- End of table reached */
if (i3 == 0)
continue; /* 0 -- Skip table entry */
/* Encode the table entry at the current index */
cp = ixname + MAXKLEN;
snmpEncodeIndex(&cp, mibp, mtp, i1);
/*
** Compare agent encoding with requested encoding.
** Save the smallest positive difference.
*/
sl1 = snmpVCompare(cp, (const uint8 *)&ixname[MAXKLEN] - cp,
reqixname, reqixlen);
if (nflag)
{
if (sl1 >= 255)
{
sl2 = 1;
break;
}
}
else
{
if (sl1 == 0)
{
sl2 = 1;
break;
}
}
}
*tabixp = i1;
return sl2;
} |
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