snmpnotifytable.c

snmp的源代码,已经在我的ubuntu下编译通过

     * this assumes you have registered all your data properly
     */
    if ((StorageTmp = (struct snmpNotifyTable_data *)
         header_complex((struct header_complex_index *)
                        snmpNotifyTableStorage, vp, name, length, exact,
                        var_len, write_method)) == NULL) {
        found = 0;
    }

    switch (vp->magic) {
    case SNMPNOTIFYTAG:
        *write_method = write_snmpNotifyTag;
        break;
    case SNMPNOTIFYTYPE:
        *write_method = write_snmpNotifyType;
        break;
    case SNMPNOTIFYSTORAGETYPE:
        *write_method = write_snmpNotifyStorageType;
        break;
    case SNMPNOTIFYROWSTATUS:
        *write_method = write_snmpNotifyRowStatus;
        break;
    default:
        *write_method = NULL;
    }

    if (!found) {
        return NULL;
    }

    switch (vp->magic) {
    case SNMPNOTIFYTAG:
        *var_len = StorageTmp->snmpNotifyTagLen;
        return (u_char *) StorageTmp->snmpNotifyTag;

    case SNMPNOTIFYTYPE:
        *var_len = sizeof(StorageTmp->snmpNotifyType);
        return (u_char *) & StorageTmp->snmpNotifyType;

    case SNMPNOTIFYSTORAGETYPE:
        *var_len = sizeof(StorageTmp->snmpNotifyStorageType);
        return (u_char *) & StorageTmp->snmpNotifyStorageType;

    case SNMPNOTIFYROWSTATUS:
        *var_len = sizeof(StorageTmp->snmpNotifyRowStatus);
        return (u_char *) & StorageTmp->snmpNotifyRowStatus;

    default:
        ERROR_MSG("");
    }
    return NULL;
}

static int
is_delim(const char c)
{
    return (c == 0x020 || c == 0x09 || c == 0x0d || c == 0x0b);
}

int
snmpTagValid(const char *tag, const size_t tagLen)
{
    size_t          i = 0;


    for (i = 0; i < tagLen; i++) {
        if (is_delim(tag[i])) {
            /*
             * Delimeters aren't allowed.  
             */
            return 0;
        }
    }
    return 1;
}

static struct snmpNotifyTable_data *StorageNew;

int
write_snmpNotifyTag(int action,
                    u_char * var_val,
                    u_char var_val_type,
                    size_t var_val_len,
                    u_char * statP, oid * name, size_t name_len)
{
    static char    *tmpvar;
    struct snmpNotifyTable_data *StorageTmp = NULL;
    static size_t   tmplen;
    size_t          newlen =
        name_len - (sizeof(snmpNotifyTable_variables_oid) / sizeof(oid) +
                    3 - 1);


    DEBUGMSGTL(("snmpNotifyTable",
                "write_snmpNotifyTag entering action=%d...  \n", action));
    if (action != RESERVE1 &&
        (StorageTmp = (struct snmpNotifyTable_data *)
         header_complex((struct header_complex_index *)
                        snmpNotifyTableStorage, NULL,
                        &name[sizeof(snmpNotifyTable_variables_oid) /
                              sizeof(oid) + 3 - 1], &newlen, 1, NULL,
                        NULL)) == NULL) {
        if ((StorageTmp = StorageNew) == NULL)
            return SNMP_ERR_NOSUCHNAME; /* remove if you support creation here */
    }


    switch (action) {
    case RESERVE1:
        if (var_val_type != ASN_OCTET_STR) {
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len < 0 || var_val_len > 255) {
            return SNMP_ERR_WRONGLENGTH;
        }
        if (!snmpTagValid(var_val, var_val_len)) {
            return SNMP_ERR_WRONGVALUE;
        }
        break;


    case RESERVE2:
        /*
         * memory reseveration, final preparation... 
         */
        tmpvar = StorageTmp->snmpNotifyTag;
        tmplen = StorageTmp->snmpNotifyTagLen;
        StorageTmp->snmpNotifyTag = calloc(1, var_val_len + 1);
        if (NULL == StorageTmp->snmpNotifyTag)
            return SNMP_ERR_RESOURCEUNAVAILABLE;
        break;


    case FREE:
        /*
         * Release any resources that have been allocated 
         */
        break;


    case ACTION:
        memcpy(StorageTmp->snmpNotifyTag, var_val, var_val_len);
        StorageTmp->snmpNotifyTagLen = var_val_len;
        break;


    case UNDO:
        /*
         * Back out any changes made in the ACTION case 
         */
        SNMP_FREE(StorageTmp->snmpNotifyTag);
        StorageTmp->snmpNotifyTag = tmpvar;
        StorageTmp->snmpNotifyTagLen = tmplen;
        tmpvar = NULL;
        break;


    case COMMIT:
        /*
         * Things are working well, so it's now safe to make the change
         * permanently.  Make sure that anything done here can't fail! 
         */
        SNMP_FREE(tmpvar);
        break;
    }

    return SNMP_ERR_NOERROR;
}



int
write_snmpNotifyType(int action,
                     u_char * var_val,
                     u_char var_val_type,
                     size_t var_val_len,
                     u_char * statP, oid * name, size_t name_len)
{
    static int      tmpvar;
    struct snmpNotifyTable_data *StorageTmp = NULL;
    long            value = *((long *) var_val);
    size_t          newlen =
        name_len - (sizeof(snmpNotifyTable_variables_oid) / sizeof(oid) +
                    3 - 1);


    DEBUGMSGTL(("snmpNotifyTable",
                "write_snmpNotifyType entering action=%d...  \n", action));
    if (action != RESERVE1 &&
        (StorageTmp = (struct snmpNotifyTable_data *)
         header_complex((struct header_complex_index *)
                        snmpNotifyTableStorage, NULL,
                        &name[sizeof(snmpNotifyTable_variables_oid) /
                              sizeof(oid) + 3 - 1], &newlen, 1, NULL,
                        NULL)) == NULL) {
        if ((StorageTmp = StorageNew) == NULL)
            return SNMP_ERR_NOSUCHNAME;
    }

    switch (action) {
    case RESERVE1:
        if (var_val_type != ASN_INTEGER) {
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len != sizeof(long)) {
            return SNMP_ERR_WRONGLENGTH;
        }
        if (value < 1 || value > 2) {
            return SNMP_ERR_WRONGVALUE;
        }
        break;

    case ACTION:
        tmpvar = StorageTmp->snmpNotifyType;
        StorageTmp->snmpNotifyType = value;
        break;

    case UNDO:
        /*
         * Back out any changes made in the ACTION case 
         */
        StorageTmp->snmpNotifyType = tmpvar;
        break;
    }

    return SNMP_ERR_NOERROR;
}



int
write_snmpNotifyStorageType(int action,
                            u_char * var_val,
                            u_char var_val_type,
                            size_t var_val_len,
                            u_char * statP, oid * name, size_t name_len)
{
    static int      tmpvar;
    long            value = *((long *) var_val);
    struct snmpNotifyTable_data *StorageTmp = NULL;
    size_t          newlen =
        name_len - (sizeof(snmpNotifyTable_variables_oid) / sizeof(oid) +
                    3 - 1);


    DEBUGMSGTL(("snmpNotifyTable",
                "write_snmpNotifyStorageType entering action=%d...  \n",
                action));
    if (action != RESERVE1 &&
        (StorageTmp = (struct snmpNotifyTable_data *)
         header_complex((struct header_complex_index *)
                        snmpNotifyTableStorage, NULL,
                        &name[sizeof(snmpNotifyTable_variables_oid) /
                              sizeof(oid) + 3 - 1], &newlen, 1, NULL,
                        NULL)) == NULL) {
        if ((StorageTmp = StorageNew) == NULL)
            return SNMP_ERR_NOSUCHNAME;
    }


    switch (action) {
    case RESERVE1:
        if (var_val_type != ASN_INTEGER) {
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len != sizeof(long)) {
            return SNMP_ERR_WRONGLENGTH;
        }
        if (value != SNMP_STORAGE_OTHER && value != SNMP_STORAGE_VOLATILE
            && value != SNMP_STORAGE_NONVOLATILE) {
            return SNMP_ERR_WRONGVALUE;
        }
        break;

    case ACTION:
        tmpvar = StorageTmp->snmpNotifyStorageType;
        StorageTmp->snmpNotifyStorageType = value;
        break;

    case UNDO:
        StorageTmp->snmpNotifyStorageType = tmpvar;
        break;
    }
    return SNMP_ERR_NOERROR;
}



int
write_snmpNotifyRowStatus(int action,
                          u_char * var_val,
                          u_char var_val_type,
                          size_t var_val_len,
                          u_char * statP, oid * name, size_t name_len)
{
    struct snmpNotifyTable_data *StorageTmp = NULL;
    static struct snmpNotifyTable_data *StorageDel;
    size_t          newlen =
        name_len - (sizeof(snmpNotifyTable_variables_oid) / sizeof(oid) +
                    3 - 1);
    static int      old_value;
    int             set_value = *((long *) var_val);
    static netsnmp_variable_list *vars, *vp;
    struct header_complex_index *hciptr;


    DEBUGMSGTL(("snmpNotifyTable",
                "write_snmpNotifyRowStatus entering action=%d...  \n",
                action));
    StorageTmp = (struct snmpNotifyTable_data *)
        header_complex((struct header_complex_index *)
                       snmpNotifyTableStorage, NULL,
                       &name[sizeof(snmpNotifyTable_variables_oid) /
                             sizeof(oid) + 3 - 1], &newlen, 1, NULL, NULL);

    switch (action) {
    case RESERVE1:
        if (var_val_type != ASN_INTEGER || var_val == NULL) {
            return SNMP_ERR_WRONGTYPE;
        }
        if (var_val_len != sizeof(long)) {
            return SNMP_ERR_WRONGLENGTH;
        }
        if (set_value < 1 || set_value > 6 || set_value == RS_NOTREADY) {
            return SNMP_ERR_WRONGVALUE;
        }
        if (StorageTmp == NULL) {
            /*
             * create the row now? 
             */
            /*
             * ditch illegal values now 
             */
            if (set_value == RS_ACTIVE || set_value == RS_NOTINSERVICE) {
                return SNMP_ERR_INCONSISTENTVALUE;
            }
        } else {
            /*
             * row exists.  Check for a valid state change 
             */
            if (set_value == RS_CREATEANDGO
                || set_value == RS_CREATEANDWAIT) {
                /*
                 * can't create a row that exists 
                 */
                return SNMP_ERR_INCONSISTENTVALUE;
            }
            /*
             * XXX: interaction with row storage type needed 
             */
        }

        /*
         * memory reseveration, final preparation... 
         */
        if (StorageTmp == NULL &&
            (set_value == RS_CREATEANDGO
             || set_value == RS_CREATEANDWAIT)) {
            /*
             * creation 
             */
            vars = NULL;

            snmp_varlist_add_variable(&vars, NULL, 0, ASN_PRIV_IMPLIED_OCTET_STR, NULL, 0);     /* snmpNotifyName */

            if (header_complex_parse_oid
                (&
                 (name
                  [sizeof(snmpNotifyTable_variables_oid) / sizeof(oid) +
                   2]), newlen, vars) != SNMPERR_SUCCESS) {
                /*
                 * XXX: free, zero vars 
                 */
                snmp_free_var(vars);
                return SNMP_ERR_INCONSISTENTNAME;
            }
            vp = vars;


            StorageNew = SNMP_MALLOC_STRUCT(snmpNotifyTable_data);
            if (StorageNew == NULL) {
                return SNMP_ERR_RESOURCEUNAVAILABLE;
            }
            StorageNew->snmpNotifyName = calloc( 1, vp->val_len + 1 );
            if (StorageNew->snmpNotifyName == NULL) {
                return SNMP_ERR_RESOURCEUNAVAILABLE;
            }
            memcpy(StorageNew->snmpNotifyName, vp->val.string, vp->val_len);
            StorageNew->snmpNotifyNameLen = vp->val_len;
            vp = vp->next_variable;

            /*
             * default values 
             */
            StorageNew->snmpNotifyStorageType = ST_NONVOLATILE;
            StorageNew->snmpNotifyType = SNMPNOTIFYTYPE_TRAP;
            StorageNew->snmpNotifyTagLen = 0;
            StorageNew->snmpNotifyTag = (char *) calloc(sizeof(char), 1);
            if (StorageNew->snmpNotifyTag == NULL) {
                return SNMP_ERR_RESOURCEUNAVAILABLE;
            }

            StorageNew->snmpNotifyRowStatus = set_value;
            snmp_free_var(vars);
        }
        break;

    case RESERVE2:
        break;

    case FREE:
        if (StorageNew != NULL) {
            SNMP_FREE(StorageNew->snmpNotifyTag);
            SNMP_FREE(StorageNew->snmpNotifyName);
            free(StorageNew);
            StorageNew = NULL;
        }
        break;

    case ACTION:
        if (StorageTmp == NULL && (set_value == RS_CREATEANDGO ||
                                   set_value == RS_CREATEANDWAIT)) {
            /*
             * row creation, so add it 
             */
            if (StorageNew != NULL) {
                snmpNotifyTable_add(StorageNew);
            }
        } else if (set_value != RS_DESTROY) {
            /*
             * set the flag? 
             */
            old_value = StorageTmp->snmpNotifyRowStatus;
            StorageTmp->snmpNotifyRowStatus = *((long *) var_val);
        } else {
            /*
             * destroy...  extract it for now 
             */
            if (StorageTmp) {
                hciptr = header_complex_find_entry(snmpNotifyTableStorage,
                                                   StorageTmp);
                StorageDel = (struct snmpNotifyTable_data *)
                    header_complex_extract_entry((struct
                                                  header_complex_index **)
                                                 &snmpNotifyTableStorage,
                                                 hciptr);
            }
        }
        break;

    case UNDO:
        /*
         * Back out any changes made in the ACTION case 
         */
        if (StorageTmp == NULL && (set_value == RS_CREATEANDGO ||
                                   set_value == RS_CREATEANDWAIT)) {
            /*
             * row creation, so remove it again 
             */
            hciptr = header_complex_find_entry(snmpNotifyTableStorage,
                                               StorageNew);
            StorageDel = (struct snmpNotifyTable_data *)
                header_complex_extract_entry((struct header_complex_index
                                              **) &snmpNotifyTableStorage,
                                             hciptr);
            /*
             * XXX: free it 
             */
        } else if (StorageDel != NULL) {
            /*
             * row deletion, so add it again 
             */
            snmpNotifyTable_add(StorageDel);
        } else if (set_value != RS_DESTROY) {
            StorageTmp->snmpNotifyRowStatus = old_value;
        }
        break;

    case COMMIT:
        if (StorageDel != NULL) {
            SNMP_FREE(StorageDel->snmpNotifyTag);
            SNMP_FREE(StorageDel->snmpNotifyName);
            free(StorageDel);
            StorageDel = NULL;
        }
        if (StorageTmp
            && StorageTmp->snmpNotifyRowStatus == RS_CREATEANDGO) {
            StorageTmp->snmpNotifyRowStatus = RS_ACTIVE;
            StorageNew = NULL;
        } else if (StorageTmp &&
                   StorageTmp->snmpNotifyRowStatus == RS_CREATEANDWAIT) {
            StorageTmp->snmpNotifyRowStatus = RS_NOTINSERVICE;
            StorageNew = NULL;
        }
        break;
    }
    return SNMP_ERR_NOERROR;
}