/*
* Portions Copyright 2000-2007 Sun Microsystems, Inc. All Rights
* Reserved. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package gov.nist.siplite.parser;
import gov.nist.siplite.SIPConstants;
import gov.nist.siplite.message.Request;
import gov.nist.siplite.header.*;
import gov.nist.core.*;
import java.util.Hashtable;
/**
* Lexer class for the parser.
*
*@version JAIN-SIP-1.1
*
*
*<a href="{@docRoot}/uncopyright.html">This code is in the public domain.</a>
*
*/
public class Lexer extends LexerCore {
/**
* Constructor with initial lecername and buffer to
* process.
* @param lexerName lexer for processing
* @param buffer data to be parsed
*/
public Lexer(String lexerName, String buffer) {
super(lexerName, buffer);
this.selectLexer(lexerName);
}
/**
* Gets the header name of the line.
* @param line the text to be parsed
* @return the header name
*/
public static String getHeaderName(String line) {
if (line == null) {
return null;
}
String headerName = null;
try {
int begin = line.indexOf(":");
headerName = null;
if (begin >= 1) {
headerName = line.substring(0, begin);
}
} catch (IndexOutOfBoundsException e) {
return null;
}
return headerName;
}
/**
* Gets the header value of the line.
* @param line the text to be parsed
* @return the header value
*/
public static String getHeaderValue(String line) {
if (line == null) {
return null;
}
String headerValue = null;
try {
int begin = line.indexOf(":");
headerValue = line.substring(begin + 1);
} catch (IndexOutOfBoundsException e) {
return null;
}
return headerValue;
}
/**
* Checks if the given string is a valid method/header/parameter name.
* @param name the text to be parsed
* @return true if the string is a valid name, false otherwise
*/
public static boolean isValidName(String name) {
// RFC 3261, p.p. 225, 221:
//
// Method = INVITEm / ACKm / OPTIONSm / BYEm
// / CANCELm / REGISTERm
// / extension-method
// extension-method = token
// token = 1*(alphanum / "-" / "." / "!" / "%" / "*"
// / "_" / "+" / "`" / "'" / "~" )
// alphanum = ALPHA / DIGIT
//
// p.227:
// generic-param = token [ EQUAL gen-value ]
//
// p. 232:
// extension-header = header-name HCOLON header-value
// header-name = token
//
if (name == null || name.length() == 0) {
return false;
}
for (int i = 0; i < name.length(); i++) {
char ch = name.charAt(i);
if (!isValidChar(ch)) {
return false;
}
}
return true;
}
/**
* Checks if the given string is a valid header/parameter value.
* @param value the text to be parsed
* @param isParameter true if the value to be checked is a parameter
* value, false otherwise
* @return true if the string is a valid value, false otherwise
*/
protected static boolean isValidValue(String value, boolean isParameter) {
// System.out.println(">>> value = " + value);
if (value == null) {
value = ""; // null is a valid parameter value
}
// Check that the value doesn't contain unescaped semicolons
boolean isEscaped = false;
boolean isQuoteOn = false;
boolean isBracketOn = false;
for (int i = 0; i < value.length(); i++) {
char ch = value.charAt(i);
// Ignore escaped (with preceding '\') characters
if (isEscaped) {
isEscaped = false;
continue;
}
// Ignore characters that are a part of the string (inside qoutes)
if (ch == '"') {
isQuoteOn = !isQuoteOn;
continue;
}
if (isQuoteOn) {
continue;
}
if (ch == '\\') {
isEscaped = true;
continue;
}
// Ignore characters inside "<" and ">"
if (isBracketOn) {
if (ch == '>') {
isBracketOn = false;
continue;
}
} else {
if (ch == '<') {
isBracketOn = true;
continue;
}
if (isParameter) {
// Restrictions on a parameter's value are more strict
// when header's value may be almost any text.
if (!isValidChar(ch)) {
return false;
}
} else {
if (ch == ';') {
return false;
}
}
}
}
// System.out.println(">>> VALID");
return true;
}
/**
* Checks if the given string is a valid header value.
* @param value the text to be parsed
* @return true if the string is a valid value, false otherwise
*/
public static boolean isValidHeaderValue(String value) {
return isValidValue(value, false);
}
/**
* Checks if the given string is a valid parameter value.
* @param value the text to be parsed
* @return true if the string is a valid value, false otherwise
*/
public static boolean isValidParameterValue(String value) {
return isValidValue(value, true);
}
/**
* Checks if the given string is valid as user part of a SIP(S)-URI.
*
* @param name the text to be parsed
* @return true if the string is a valid name, false otherwise
*/
public static boolean isValidUserName(String name) {
// RFC3261 p.222
// user = 1*( unreserved / escaped / user-unreserved )
// user-unreserved = "&" / "=" / "+" / "$" / "," / ";" / "?" / "/"
// p.219
// alphanum = ALPHA / DIGIT
// p.220
// unreserved = alphanum / mark
// mark = "-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")"
// escaped = "%" HEXDIG HEXDIG
//
if (name == null) {
return true;
}
if (name.length() == 0) {
// Zerolength case causes wrong AT symbol appending,
// the name has to be null or nonempty
return false;
}
for (int i = 0; i < name.length(); i++) {
char ch = name.charAt(i);
if (URLParser.isUnreserved(ch) ||
isEscaped(name, i) ||
URLParser.isUserUnreserved(ch)) {
continue;
} else {
return false;
}
}
return true;
}
/**
* Checks if the given string is valid display name.
*
* @param displayName the text to be parsed
* @return true if the string is a valid display name, false otherwise
*/
public static boolean isValidDisplayName(String displayName) {
// RFC 3261 p.228
// display-name = *(token LWS)/ quoted-string
// p.220
// LWS = [*WSP CRLF] 1*WSP ; linear whitespace
// UTF8-NONASCII = %xC0-DF 1UTF8-CONT
// / %xE0-EF 2UTF8-CONT
// / %xF0-F7 3UTF8-CONT
// / %xF8-Fb 4UTF8-CONT
// / %xFC-FD 5UTF8-CONT
// UTF8-CONT = %x80-BF
// p.221
// token = 1*(alphanum / "-" / "." / "!" / "%" / "*"
// / "_" / "+" / "`" / "'" / "~" )
// p.222
// quoted-string = SWS DQUOTE *(qdtext / quoted-pair ) DQUOTE
// qdtext = LWS / %x21 / %x23-5B / %x5D-7E
// / UTF8-NONASCII
// quoted-pair = "\" (%x00-09 / %x0B-0C
// / %x0E-7F)
if (null == displayName) {
return false;
}
boolean quoted = false;
displayName = StringTokenizer.convertNewLines(displayName);
displayName = displayName.trim();
int i = 0;
if ('"' == displayName.charAt(0)) {
quoted = true;
i++;
}
while (i < displayName.length()) {
char ch = displayName.charAt(i);
if (!quoted) {
if (!isValidChar(ch) && ch != ' ' && ch != 0x09) {
return false;
}
} else {
// left UTF8-NONASCII proper converting on i18n subsystem
if (ch < 0x20 ||
(ch == '"' && i != displayName.length() - 1) ||
(ch > 0x7E && ch < 0xC0)) {
return false;
}
if (ch == '\\') {
if (isQuotedPair(displayName, i)) {
i++;
} else {
return false;
}
}
}
i++;
}
return true;
}
/**
* Checks if the given string is valid scheme name.
*
* @param scheme the text to be parsed
* @return true if the string is a valid scheme name, false otherwise
*/
public static boolean isValidScheme(String scheme) {
// RFC3261 p.224
// scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
if (null == scheme ||
0 == scheme.length() ||
!isAlpha(scheme.charAt(0))) {
return false;
}
char ch;
for (int i = 1; i < scheme.length(); i++) {
ch = scheme.charAt(i);
if (!Character.isDigit(ch) &&
!isAlpha(ch) &&
ch != '+' &&
ch != '-' &&
ch != '.') {
return false;
}
}
return true;
}
/**
* Checks if the given string is valid IPv6Address.
*
* BNF (RFC3261, p. 223, 232):
* IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
* IPv6address = hexpart [ ":" IPv4address ]
* hexpart = hexseq / hexseq "::" [ hexseq ] / "::" [ hexseq ]
* hexseq = hex4 *( ":" hex4)
* hex4 = 1*4HEXDIG
*
* @param address the text to be parsed
* @return true if the string is a valid IPv6Address, false otherwise
*/
public static boolean isValidIpv6Address(String address) {
char ch;
if (address == null || 0 == address.length()) {
return false;
}
int len = address.length();
int colonCount = 0, hexdigCount = 0;
for (int i = 0; i < len; i++) {
ch = address.charAt(i);
if (ch == ':') {
colonCount++;
continue;
}
if (ch == '.') {
int colonPos = address.lastIndexOf(':', i);
if (colonPos > 0) {
return isValidIpv4Address(address.substring(colonPos + 1));
} else {
return false;
}
}
if (hexdigCount > 4 || colonCount > 2) {
return false;
}
colonCount = 0;
// Check for IP v6:
// hex digit?
if (isHexDigit(ch)) {
hexdigCount++;
continue;
}
if (hexdigCount > 0) {
// Hex part must be followed by ":", "::" or by the end
// of address. '.' means IP v6 address.
if ((i < len-1) && (ch != ':') && (ch != '.')) {
return false;
}
}
hexdigCount = 0;
// Check for IP v4.
if (!(Character.isDigit(ch) || (ch == '.'))) {
return false;
}
} // end for
// report about wrong address "::::::"
// and "::44444
if (hexdigCount > 4 || colonCount > 2) {
return false;
}
return true;
}
/**
* Checks if the given string is valid IPv4Address.
*
* BNF (RFC3261, p. 223, 232):
* IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
*
* @param address the text to be parsed
* @return true if the string is a valid IPv4Address, false otherwise
*/
public static boolean isValidIpv4Address(String address) {
char ch;
if (address == null || 0 == address.length()) {
return false;
}
int len = address.length();
int pointCount = 0, digitCount = 0;
int totalPoint = 0;
for (int i = 0; i < len; i++) {
ch = address.charAt(i);
if (ch == '.') {
if (i == len - 1) {
return false;
}
pointCount++;
totalPoint++;
digitCount = 0;
continue;
}
if (digitCount > 3 || pointCount > 1) {
return false;
}
pointCount = 0;
if (!isDigit(ch)) {
return false;
} else {
digitCount++;
}
} // end for
if (totalPoint != 3) {
return false;
}
return true;
}
/**
* Checks if the given string is valid hostname
*
* BNF(RFC3261 p.222)
* hostname = *( domainlabel "." ) toplabel [ "." ]
* domainlabel = alphanum
* / alphanum *( alphanum / "-" ) alphanum
* toplabel = ALPHA / ALPHA *( alphanum / "-" ) alphanum
*
* @param address the text to be parsed
* @return true if the string is a valid hostname,
* false otherwise
*/
public static boolean isValidHostname(String address) {
if (address == null || 0 == address.length()) {
return false;
}
int pCount = 0;
boolean isHostname = false;
for (int i = 0; i < address.length(); i++) {
char c = address.charAt(i);
if (c == '.' ||
isAlpha(c) ||
c == '-' ||
isDigit(c)) {
continue;
} else {
return false;
}
}
int lastPointPos = address.lastIndexOf('.');
String toplabel;
if (lastPointPos == address.length() - 1) {
if (0 == lastPointPos) {
// address is "."
return false;
}
// get the previous point position
// or -1
lastPointPos = address.lastIndexOf('.', lastPointPos - 1);
}
// if there is no previous point toplabel equals whole string
toplabel = address.substring(lastPointPos + 1);
if (!isAlpha(toplabel.charAt(0))) {
return false;
}
return true;
}
/**
* Selects the lexer to used based
* on the current parsing context.
* @param lexerName the lexer engine
*/
public void selectLexer(String lexerName) {
currentLexer = (Hashtable) lexerTables.get(lexerName);
this.currentLexerName = lexerName;
/*
* 'SIP'/'SIPS' keywords are added to the keyword list
* for all lexers except "command_keywordLexer" and
* "method_keywordLexer" according to the RFC 3261:
*
* For "status_lineLexer" (p. 225):
*
* Response = Status-Line
* *( message-header )
* CRLF
* [ message-body ]
* Status-Line = SIP-Version SP Status-Code SP Reason-Phrase CRLF
*
* For "request_lineLexer" (p. 223):
*
* Request = Request-Line
* *( message-header )
* CRLF
* [ message-body ]
* Request-Line = Method SP Request-URI SP SIP-Version CRLF
*
* For "sip_urlLexer" (p. 222):
*
* SIP-URI = "sip:" [ userinfo ] hostport
* uri-parameters [ headers ]
*/
if (currentLexer == null) {
addLexer(lexerName);
if (lexerName.equals("method_keywordLexer")) {
addKeyword(Request.REGISTER.toUpperCase(),
TokenTypes.REGISTER);
addKeyword(Request.ACK.toUpperCase(),
TokenTypes.ACK);
addKeyword(Request.OPTIONS.toUpperCase(),
TokenTypes.OPTIONS);
addKeyword(Request.BYE.toUpperCase(),
TokenTypes.BYE);
addKeyword(Request.INVITE.toUpperCase(),
TokenTypes.INVITE);
addKeyword(Request.SUBSCRIBE.toUpperCase(),
TokenTypes.SUBSCRIBE);
addKeyword(Request.NOTIFY.toUpperCase(),
TokenTypes.NOTIFY);
addKeyword(Request.MESSAGE.toUpperCase(),
TokenTypes.MESSAGE);
addKeyword(Request.PUBLISH.toUpperCase(),
TokenTypes.PUBLISH);
addKeyword(Request.REFER.toUpperCase(),
TokenTypes.REFER);
addKeyword(Request.INFO.toUpperCase(),
TokenTypes.INFO);
addKeyword(Request.UPDATE.toUpperCase(),
TokenTypes.UPDATE);
} else if (lexerName.equals("command_keywordLexer")) {
addKeyword(Header.FROM.toUpperCase(),
TokenTypes.FROM); // 1
addKeyword(Header.TO.toUpperCase(),
TokenTypes.TO); // 2
addKeyword(Header.VIA.toUpperCase(),
TokenTypes.VIA); // 3
addKeyword(Header.ROUTE.toUpperCase(),
TokenTypes.ROUTE); // 4
addKeyword(Header.MAX_FORWARDS.toUpperCase(),
TokenTypes.MAX_FORWARDS); // 5
addKeyword(Header.AUTHORIZATION.toUpperCase(),
TokenTypes.AUTHORIZATION); // 6
addKeyword(Header.PROXY_AUTHORIZATION.toUpperCase(),
TokenTypes.PROXY_AUTHORIZATION); // 7
addKeyword(Header.DATE.toUpperCase(),
TokenTypes.DATE); // 8
addKeyword(Header.CONTENT_ENCODING.toUpperCase(),
TokenTypes.CONTENT_ENCODING); // 9
addKeyword(Header.CONTENT_LENGTH.toUpperCase(),
TokenTypes.CONTENT_LENGTH); // 10
addKeyword(Header.CONTENT_TYPE.toUpperCase(),
TokenTypes.CONTENT_TYPE); // 11
addKeyword(Header.CONTACT.toUpperCase(),
TokenTypes.CONTACT); // 12
addKeyword(Header.CALL_ID.toUpperCase(),
TokenTypes.CALL_ID); // 13
addKeyword(Header.EXPIRES.toUpperCase(),
TokenTypes.EXPIRES); // 14
addKeyword(Header.RECORD_ROUTE.toUpperCase(),
TokenTypes.RECORD_ROUTE); // 15
addKeyword(Header.CSEQ.toUpperCase(),
TokenTypes.CSEQ); // 16
addKeyword(Header.WWW_AUTHENTICATE.toUpperCase(),
TokenTypes.WWW_AUTHENTICATE); // 17
addKeyword(Header.PROXY_AUTHENTICATE.toUpperCase(),
TokenTypes.PROXY_AUTHENTICATE); // 18
addKeyword(Header.EVENT.toUpperCase(),
TokenTypes.EVENT); // 19
addKeyword(Header.SUBJECT.toUpperCase(),
TokenTypes.SUBJECT); // 20
addKeyword(Header.SUPPORTED.toUpperCase(),
TokenTypes.SUPPORTED); // 21
addKeyword(Header.ALLOW_EVENTS.toUpperCase(),
TokenTypes.ALLOW_EVENTS); // 22
addKeyword(Header.ACCEPT_CONTACT.toUpperCase(),
TokenTypes.ACCEPT_CONTACT); // 23
// And now the dreaded short forms....
addKeyword(SIPConstants.TOKEN_LETTER_C.toUpperCase(),
TokenTypes.CONTENT_TYPE);
// CR fix
addKeyword(SIPConstants.TOKEN_LETTER_F.toUpperCase(),
TokenTypes.FROM);
addKeyword(SIPConstants.TOKEN_LETTER_I.toUpperCase(),
TokenTypes.CALL_ID);
addKeyword(SIPConstants.TOKEN_LETTER_M.toUpperCase(),
TokenTypes.CONTACT);
addKeyword(SIPConstants.TOKEN_LETTER_E.toUpperCase(),
TokenTypes.CONTENT_ENCODING);
addKeyword(SIPConstants.TOKEN_LETTER_L.toUpperCase(),
TokenTypes.CONTENT_LENGTH);
addKeyword(SIPConstants.TOKEN_LETTER_C.toUpperCase(),
TokenTypes.CONTENT_TYPE);
addKeyword(SIPConstants.TOKEN_LETTER_T.toUpperCase(),
TokenTypes.TO);
addKeyword(SIPConstants.TOKEN_LETTER_V.toUpperCase(),
TokenTypes.VIA);
addKeyword(SIPConstants.TOKEN_LETTER_O.toUpperCase(),
TokenTypes.EVENT);
addKeyword(SIPConstants.TOKEN_LETTER_S.toUpperCase(),
TokenTypes.SUBJECT);
addKeyword(SIPConstants.TOKEN_LETTER_K.toUpperCase(),
TokenTypes.SUPPORTED);
addKeyword(SIPConstants.TOKEN_LETTER_U.toUpperCase(),
TokenTypes.ALLOW_EVENTS);
addKeyword(SIPConstants.TOKEN_LETTER_A.toUpperCase(),
TokenTypes.ACCEPT_CONTACT);
} else if (lexerName.equals("status_lineLexer") ||
lexerName.equals("request_lineLexer")) {
addKeyword(SIPConstants.SCHEME_SIP.toUpperCase(),
TokenTypes.SIP);
addKeyword(SIPConstants.SCHEME_SIPS.toUpperCase(),
TokenTypes.SIPS);
} else if (lexerName.equals("sip_urlLexer")) {
addKeyword(SIPConstants.SCHEME_TEL.toUpperCase(),
TokenTypes.TEL);
addKeyword(SIPConstants.SCHEME_SIP.toUpperCase(),
TokenTypes.SIP);
addKeyword(SIPConstants.SCHEME_SIPS.toUpperCase(),
TokenTypes.SIPS);
}
}
}
}
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