/* Build a variable binding. * * RFC 1905: Protocol Operations for SNMPv2 * * VarBind ::= * SEQUENCE { * name ObjectName * CHOICE { * value ObjectSyntax * unSpecified NULL * noSuchObject[0] NULL * noSuchInstance[1] NULL * endOfMibView[2] NULL * } * } */ u_char *snmp_var_EncodeVarBind(u_char *Buffer, int *BufLenP, struct variable_list *VarList, int Version) { struct variable_list *Vars; u_char *bufp; u_char *HeaderStart; u_char *HeaderEnd; int FakeArg = *BufLenP; #ifdef DEBUG_VARS_ENCODE int StartLen = *BufLenP; int Counter = 1; #endif bufp = Buffer; #ifdef DEBUG_VARS_ENCODE printf("VARS: Encoding Variable list into buffer at 0x%x.\n", Buffer); #endif for (Vars=VarList; Vars; Vars=Vars->next_variable) { #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding Variable 0x%x.\n", Counter, Vars); printf("VARS %d: Starting at 0x%x (%d bytes left)\n", Counter, bufp, *BufLenP); #endif /* Build the header for this variable * * Use Maximum size. */ HeaderStart = bufp; HeaderEnd = asn_build_header(HeaderStart, BufLenP, (u_char)(ASN_SEQUENCE | ASN_CONSTRUCTOR), FakeArg); if (HeaderEnd == NULL) return(NULL); #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding Object Identifier 0x%x (%d bytes) at 0x%x (%d bytes left)\n", Counter, Vars, Vars->name_length, HeaderEnd, *BufLenP); print_oid(Vars->name, Vars->name_length), #endif /* Now, let's put the Object Identifier into the buffer */ bufp = asn_build_objid(HeaderEnd, BufLenP, (u_char)(ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_OBJECT_ID), Vars->name, Vars->name_length); if (bufp == NULL) return(NULL); /* Now put the data in */ switch(Vars->type) { case ASN_INTEGER: #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding Integer %d at 0x%x\n", Counter, *(Vars->val.integer), bufp); #endif bufp = asn_build_int(bufp, BufLenP, Vars->type, (int *)Vars->val.integer, Vars->val_len); break; case SMI_COUNTER32: case SMI_GAUGE32: /* case SMI_UNSIGNED32: */ case SMI_TIMETICKS: #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding Timeticks %d at 0x%x\n", Counter, *(Vars->val.integer), bufp); #endif bufp = asn_build_unsigned_int(bufp, BufLenP, Vars->type, (u_int *)Vars->val.integer, Vars->val_len); break; case ASN_OCTET_STR: case SMI_IPADDRESS: case SMI_OPAQUE: #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding String %s (%d bytes) at 0x%x\n", Counter, (Vars->val.string), Vars->val_len, bufp); #endif bufp = asn_build_string(bufp, BufLenP, Vars->type, Vars->val.string, Vars->val_len); break; case ASN_OBJECT_ID: #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding Object Identifier (%d bytes) at 0x%x\n", Counter, Vars->val_len, bufp); #endif bufp = asn_build_objid(bufp, BufLenP, Vars->type, (oid *)Vars->val.objid, Vars->val_len / sizeof(oid)); break; case SMI_NOSUCHINSTANCE: case SMI_NOSUCHOBJECT: case SMI_ENDOFMIBVIEW: #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding NULL at 0x%x\n", Counter, bufp); #endif if (Version == SNMP_VERSION_1) { /* SNMP Version 1 does not support these error codes. */ bufp = asn_build_null(bufp, BufLenP, SMI_NOSUCHOBJECT); } else { bufp = asn_build_exception(bufp, BufLenP, Vars->type); } break; case ASN_NULL: #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Encoding NULL at 0x%x\n", Counter, bufp); #endif bufp = asn_build_null(bufp, BufLenP, Vars->type); break; case SMI_COUNTER64: #ifdef STDERR_OUTPUT fprintf(stderr, WIDE("Unable to encode type SMI_COUNTER64!\n")); #endif /* Fall through */ default: snmp_set_api_error(SNMPERR_UNSUPPORTED_TYPE); return(NULL); } /* ASSERT: bufp should now point to the next valid byte. */ if (bufp == NULL) return(NULL); /* Rebuild the header with the appropriate length */ #ifdef DEBUG_VARS_ENCODE printf("VARS %d: Resetting length to %d at 0x%x (%d bytes left)\n", Counter, (bufp - HeaderEnd), HeaderStart, *BufLenP); #endif HeaderEnd = asn_build_header(HeaderStart, &FakeArg, (u_char)(ASN_SEQUENCE | ASN_CONSTRUCTOR), (bufp - HeaderEnd)); /* Returns NULL */ if (HeaderEnd == NULL) return(NULL); #ifdef DEBUG_VARS_ENCODE Counter++; #endif } #ifdef DEBUG_VARS_ENCODE printf("VARS: Variable list of %d vars takes up %d bytes.\n", --Counter, StartLen - *BufLenP); #endif /* or the end of the entire thing */ return(bufp); }
/* Build a variable binding. * * RFC 1905: Protocol Operations for SNMPv2 * * VarBind ::= * SEQUENCE { * name ObjectName * CHOICE { * value ObjectSyntax * unSpecified NULL * noSuchObject[0] NULL * noSuchInstance[1] NULL * endOfMibView[2] NULL * } * } */ u_char * snmp_var_EncodeVarBind(u_char * Buffer, int *BufLenP, variable_list * VarList, int Version) { struct variable_list *Vars; u_char *bufp; u_char *HeaderStart; u_char *HeaderEnd; int FakeArg = *BufLenP; bufp = Buffer; for (Vars = VarList; Vars; Vars = Vars->next_variable) { /* Build the header for this variable * * Use Maximum size. */ HeaderStart = bufp; HeaderEnd = asn_build_header(HeaderStart, BufLenP, (u_char) (ASN_SEQUENCE | ASN_CONSTRUCTOR), FakeArg); if (HeaderEnd == NULL) return (NULL); /* Now, let's put the Object Identifier into the buffer */ bufp = asn_build_objid(HeaderEnd, BufLenP, (u_char) (ASN_UNIVERSAL | ASN_PRIMITIVE | ASN_OBJECT_ID), Vars->name, Vars->name_length); if (bufp == NULL) return (NULL); /* Now put the data in */ switch (Vars->type) { case ASN_INTEGER: bufp = asn_build_int(bufp, BufLenP, Vars->type, (int *) Vars->val.integer, Vars->val_len); break; case SMI_COUNTER32: case SMI_GAUGE32: /* case SMI_UNSIGNED32: */ case SMI_TIMETICKS: bufp = asn_build_unsigned_int(bufp, BufLenP, Vars->type, (u_int *) Vars->val.integer, Vars->val_len); break; case ASN_OCTET_STR: case SMI_IPADDRESS: case SMI_OPAQUE: bufp = asn_build_string(bufp, BufLenP, Vars->type, Vars->val.string, Vars->val_len); break; case ASN_OBJECT_ID: bufp = asn_build_objid(bufp, BufLenP, Vars->type, (oid *) Vars->val.objid, Vars->val_len / sizeof(oid)); break; case SMI_NOSUCHINSTANCE: case SMI_NOSUCHOBJECT: case SMI_ENDOFMIBVIEW: if (Version == SNMP_VERSION_1) { /* SNMP Version 1 does not support these error codes. */ bufp = asn_build_null(bufp, BufLenP, SMI_NOSUCHOBJECT); } else { bufp = asn_build_exception(bufp, BufLenP, Vars->type); } break; case ASN_NULL: bufp = asn_build_null(bufp, BufLenP, Vars->type); break; case SMI_COUNTER64: snmplib_debug(2, "Unable to encode type SMI_COUNTER64!\n"); /* Fall through */ default: snmp_set_api_error(SNMPERR_UNSUPPORTED_TYPE); return (NULL); } /* ASSERT: bufp should now point to the next valid byte. */ if (bufp == NULL) return (NULL); /* Rebuild the header with the appropriate length */ HeaderEnd = asn_build_header(HeaderStart, &FakeArg, (u_char) (ASN_SEQUENCE | ASN_CONSTRUCTOR), (bufp - HeaderEnd)); /* Returns NULL */ if (HeaderEnd == NULL) return (NULL); } /* or the end of the entire thing */ return (bufp); }