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pcap4j-core/src/main/java/org/pcap4j/packet/DnsRDataCaa.java
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| /*_########################################################################## | ||
| _## | ||
| _## Copyright (C) 2017 Pcap4J.org | ||
| _## | ||
| _########################################################################## | ||
| */ | ||
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| package org.pcap4j.packet; | ||
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| import org.pcap4j.packet.DnsResourceRecord.DnsRData; | ||
| import org.pcap4j.util.ByteArrays; | ||
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| /** | ||
| * DNS CAA RDATA | ||
| * | ||
| * <pre style="white-space: pre;"> | ||
| * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | ||
| * | FLAG | | ||
| * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | ||
| * / TAG / | ||
| * / / | ||
| * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | ||
| * / VALUE / | ||
| * / / | ||
| * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | ||
| * | ||
| * where: | ||
| * | ||
| * FLAG One octet containing bit flags for record. See rfc for details. | ||
| * | ||
| * TAG The property identifier, a sequence of US-ASCII characters. | ||
| * | ||
| * VALUE A sequence of octets representing the property value. | ||
| * | ||
| * </pre> | ||
| * | ||
| * @see <a href="https://tools.ietf.org/html/rfc6844">RFC 6844</a> | ||
| * @author Paulo Pacheco | ||
| * @since pcap4j 1.7.2 | ||
| */ | ||
| public final class DnsRDataCaa implements DnsRData { | ||
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| private final int flag; | ||
| private final String tag; | ||
| private final String value; | ||
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| private static final int CAA_RR_MIN_LEN = 6 /* Do not accept empty tag values */; | ||
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| /** A serial UID for serialization. */ | ||
| private static final long serialVersionUID = -1015182073420031158L; | ||
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| /** | ||
| * A static factory method. | ||
| * This method validates the arguments by {@link ByteArrays#validateBounds(byte[], int, int)}, | ||
| * which may throw exceptions undocumented here. | ||
| * | ||
| * @param rawData rawData | ||
| * @param offset offset | ||
| * @param length length | ||
| * @return a new DnsRDataCaa object. | ||
| * @throws IllegalRawDataException if parsing the raw data fails. | ||
| */ | ||
| public static DnsRDataCaa newInstance( | ||
| byte[] rawData, int offset, int length | ||
| ) throws IllegalRawDataException { | ||
| ByteArrays.validateBounds(rawData, offset, length); | ||
| return new DnsRDataCaa(rawData, offset, length); | ||
| } | ||
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| private DnsRDataCaa(byte[] rawData, int offset, int length) throws IllegalRawDataException { | ||
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| if (length < CAA_RR_MIN_LEN) { | ||
| throw new IllegalRawDataException("The data is too short to build a DnsRDataCaa"); | ||
| } | ||
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| this.flag = ByteArrays.getByte(rawData, offset) & 0xFF; | ||
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| /* Reading single property entry consisting of a tag-value pair. */ | ||
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| /* Read tag */ | ||
| int cursor = 1; | ||
| int tagLen = rawData[offset + cursor] & 0xFF; | ||
| cursor++; /* tag len */ | ||
| this.tag = new String(rawData, offset + cursor, tagLen); | ||
| cursor+=tagLen; | ||
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| /* Read value */ | ||
| this.value = new String(rawData, offset + cursor, length - cursor); | ||
| } | ||
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| private DnsRDataCaa(Builder builder) { | ||
| if (builder == null || builder.tag == null || builder.value == null) { | ||
| StringBuilder sb = new StringBuilder(); | ||
| sb.append("builder: ").append(builder) | ||
| .append(" builder.tag: ").append(builder.tag) | ||
| .append(" builder.value: ").append(builder.value); | ||
| throw new NullPointerException(sb.toString()); | ||
| } | ||
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| if (builder.flag > 255 || builder.flag < 0) { | ||
| StringBuilder sb = new StringBuilder(); | ||
| sb.append("Invalid value for flag: ").append(builder.flag); | ||
| throw new IllegalArgumentException(sb.toString()); | ||
| } | ||
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| this.flag = builder.flag; | ||
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| /* TODO: validate if tag follows rfc rules. | ||
| Tag values MAY contain US-ASCII characters 'a' through 'z', 'A' | ||
| through 'Z', and the numbers 0 through 9. Tag values SHOULD NOT | ||
| contain any other characters. Matching of tag values is case | ||
| insensitive. | ||
| Tag values submitted for registration by IANA MUST NOT contain any | ||
| characters other than the (lowercase) US-ASCII characters 'a' | ||
| through 'z' and the numbers 0 through 9. | ||
| */ | ||
| this.tag = builder.tag; | ||
| this.value = builder.value; | ||
| } | ||
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| @Override | ||
| public int length() { | ||
| return 1 /* flag */ + 1 /* tag len */ + tag.length() + | ||
| + value.length(); | ||
| } | ||
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| @Override | ||
| public byte[] getRawData() { | ||
| int len = this.length(); | ||
| byte rawData[] = new byte[len]; | ||
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| rawData[0] = (byte) this.flag; | ||
| rawData[1] = (byte) this.tag.length(); | ||
| int cursor = 2; | ||
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| System.arraycopy(this.tag.getBytes(), 0, rawData, cursor, this.tag.length()); | ||
| cursor += this.tag.length(); | ||
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| System.arraycopy(this.value.getBytes(), 0, rawData, cursor, this.value.length()); | ||
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| return rawData; | ||
| } | ||
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| /** | ||
| * @return a new Builder object populated with this object's fields. | ||
| */ | ||
| public Builder getBuilder() { return new Builder(this); } | ||
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| @Override | ||
| public String toString(String indent) { | ||
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| String ls = System.getProperty("line.separator"); | ||
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| StringBuilder sb = new StringBuilder(); | ||
| sb.append(indent).append("CAA RDATA:").append(ls); | ||
| sb.append(indent); | ||
| sb.append(" CAA: "); | ||
| sb.append(this.flag); | ||
| sb.append(" "); | ||
| sb.append(this.tag); | ||
| sb.append(" "); | ||
| sb.append(this.value); | ||
| sb.append(ls); | ||
|
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| return sb.toString(); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return toString(""); | ||
| } | ||
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| @Override | ||
| public String toString(String indent, byte[] headerRawData) { | ||
| // TODO Auto-generated method stub. | ||
| // I don't know where this is called with headerRawData | ||
| return toString(indent); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| final int prime = 31; | ||
| int result = 1; | ||
| result = prime * result + flag; | ||
| result = prime * result + ((tag == null) ? 0 : tag.hashCode()); | ||
| result = prime * result + ((value == null) ? 0 : value.hashCode()); | ||
| return result; | ||
| } | ||
|
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| @Override | ||
| public boolean equals(Object obj) { | ||
| if (this == obj) | ||
| return true; | ||
| if (obj == null) | ||
| return false; | ||
| if (getClass() != obj.getClass()) | ||
| return false; | ||
| DnsRDataCaa other = (DnsRDataCaa) obj; | ||
| if (flag != other.flag) | ||
| return false; | ||
| if (tag == null) { | ||
| if (other.tag != null) | ||
| return false; | ||
| } else if (!tag.equals(other.tag)) | ||
| return false; | ||
| if (value == null) { | ||
| if (other.value != null) | ||
| return false; | ||
| } else if (!value.equals(other.value)) | ||
| return false; | ||
| return true; | ||
| } | ||
|
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| /** | ||
| * @author Paulo Pacheco | ||
| * @since pcap4j 1.7.2 | ||
| */ | ||
| public static final class Builder { | ||
|
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| private int flag; | ||
| private String tag; | ||
| private String value; | ||
|
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| public Builder() { flag = 0; } | ||
|
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| private Builder(DnsRDataCaa obj) { | ||
| this.flag = obj.flag; | ||
| this.tag = obj.tag; | ||
| this.value = obj.value; | ||
| } | ||
|
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| /** | ||
| * @param flaf flag | ||
| * @return this Builder object for method chaining. | ||
| */ | ||
| public Builder flag(int flag) { | ||
| this.flag = flag; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * @param flaf flag | ||
| * @return this Builder object for method chaining. | ||
| */ | ||
| public Builder flag(byte flag) { | ||
| this.flag = flag & 0xFF; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * @param tag tag | ||
| * @return this Builder object for method chaining. | ||
| */ | ||
| public Builder tag(String tag) { | ||
| this.tag = tag; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * @param value value | ||
| * @return this Builder object for method chaining. | ||
| */ | ||
| public Builder value(String value) { | ||
| this.value = value; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * @return a new DnsRDataCaa object. | ||
| */ | ||
| public DnsRDataCaa build() { | ||
| return new DnsRDataCaa(this); | ||
| } | ||
| } | ||
| } |
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