/usr/include/resip/stack/Helper.hxx is in libresiprocate-1.11-dev 1:1.11.0~beta5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define RESIP_HELPER_HXX
#include <time.h>
#include "resip/stack/NonceHelper.hxx"
#include "resip/stack/Symbols.hxx"
#include "resip/stack/Uri.hxx"
#include "resip/stack/MethodTypes.hxx"
#include "rutil/BaseException.hxx"
#include "rutil/Data.hxx"
#include "resip/stack/Contents.hxx"
#include "resip/stack/SecurityAttributes.hxx"
#include "resip/stack/SdpContents.hxx"
namespace resip
{
class SipMessage;
class NameAddr;
class SecurityAttributes;
class Security;
class UnsupportedAuthenticationScheme : public BaseException
{
public:
UnsupportedAuthenticationScheme(const Data& msg, const Data& file, const int line)
: BaseException(msg, file, line) {}
const char* name() const { return "UnsupportedAuthenticationScheme"; }
};
/**
@ingroup resip_crit
@brief An aggregation of useful static functions.
These are mostly involved with
- The manufacture of SIP messages (requests and responses). This is of
particular importance to app-writers.
- Digest auth related functions.
*/
class Helper
{
public:
/// bytes in to-tag& from-tag, should prob. live somewhere else
const static int tagSize;
/**
Used by Registration, Publication and Subscription refreshes, to
calculate the time at which a refresh should be performed (which
is some time, that is a bit smaller than the Expiration interval).
The recommended calculation from the RFC's is the minimnum of the
Exipiration interval less 5 seconds and nine tenths of the exipiration
interval.
*/
template<typename T>
static T aBitSmallerThan(T secs)
{
return resipMax(T(0), resipMin(T(secs-5), T(9*secs/10)));
}
/**
Converts an interger in a character string containing the
hexidecimal representation of the integer. Note: The
string buffer provided should be at least 8 characters long.
This function will NOT NULL terminate the string.
@param _d A pointer to the character buffer to write
the hex string
@param _s The integer value to convert.
@param _l Boolean flag to include leading 0 zeros or
not.
*/
static void integer2hex(char* _d, unsigned int _s, bool _l = true);
/**
Converts a character string containing a hexidecimal value
into an unsigned int. Note: Parsing stops after the first
non-hex character, or after 8 characters have been processed.
@param _s A pointer to the character buffer to convert.
@returns The integer value of the coverted hex string.
*/
static unsigned int hex2integer(const char* _s);
/**
Used to jitter the expires in a SUBSCRIBE or REGISTER expires header
@param input Value to jitter
@param lowerPercentage The lower range of the random percentage by which
to jitter the value by.
@param upperPercentage The upper range of the random percentage by which
to jitter the value by. Must be greater than or equal
to lowerPercentage
@param minimum Only jitter the input if greater than minimum
*/
static int jitterValue(int input, int lowerPercentage, int upperPercentage, int minimum=0);
/**
Make an invite request - Empty Contact and Via is added and will be populated
by the stack when sent.
@param target Ends up in the RequestURI and To header
@param from Ends up in the From header
*/
static SipMessage* makeInvite(const NameAddr& target, const NameAddr& from);
/**
Make an invite request using a overridden contact header - Empty Via is added
and will be populated by the stack when sent.
@param target Ends up in the RequestURI and To header
@param from Ends up in the From header
@param contact Ends up in the Contact header. Stack will not change this
when sent.
*/
static SipMessage* makeInvite(const NameAddr& target, const NameAddr& from, const NameAddr& contact);
/**
Make a response to a provided request. Adds a To tag, Contact and Record-Route
headers appropriately.
@param response SipMessage populated with the appropriate response
@param request SipMessage request from which to generate the response
@param responseCode Response code to use on status line.
@param reason Optional reason string to use on status line. If not provided
then a default reason string will be added for well defined
response codes.
@param hostname Optional hostname to use in Warning header. Only used if
warning is also provided.
@param warning Optional warning text. If present a Warning header is added
and hostname is used in warning header.
*/
static void makeResponse(SipMessage& response,
const SipMessage& request,
int responseCode,
const Data& reason = Data::Empty,
const Data& hostname = Data::Empty,
const Data& warning=Data::Empty);
/**
Make a response to a provided request with an overridden Contact.
Adds a To tag, Contact and Record-Route headers appropriately.
@param response SipMessage populated with the appropriate response
@param request SipMessage request from which to generate the response
@param responseCode Response code to use on status line.
@param myContact Contact header to add to response.
@param reason Optional reason string to use on status line. If not provided
then a default reason string will be added for well defined
response codes.
@param hostname Optional hostname to use in Warning header. Only used if
warning is also provided.
@param warning Optional warning text. If present a Warning header is added
and hostname is used in warning header.
*/
static void makeResponse(SipMessage& response,
const SipMessage& request,
int responseCode,
const NameAddr& myContact,
const Data& reason = Data::Empty,
const Data& hostname = Data::Empty,
const Data& warning=Data::Empty);
/**
Make a new response to a provided request. Adds a To tag, Contact and
Record-Route headers appropriately. Caller owns the returned pointer and
is responsible for deleting it.
@param request SipMessage request from which to generate the response
@param responseCode Response code to use on status line.
@param reason Optional reason string to use on status line. If not provided
then a default reason string will be added for well defined
response codes.
@param hostname Optional hostname to use in Warning header. Only used if
warning is also provided.
@param warning Optional warning text. If present a Warning header is added
and hostname is used in warning header
@returns SipMessage populated with the appropriate response.
Caller must deallocate.
*/
static SipMessage* makeResponse(const SipMessage& request,
int responseCode,
const Data& reason = Data::Empty,
const Data& hostname = Data::Empty,
const Data& warning=Data::Empty);
/**
Make a new response to a provided request with an overridden Contact.
Adds a To tag, Contact and Record-Route headers appropriately.
Caller owns the returned pointer and is responsible for deleting it.
@param request SipMessage request from which to generate the response
@param responseCode Response code to use on status line.
@param myContact Contact header to add to response.
@param reason Optional reason string to use on status line. If not provided
then a default reason string will be added for well defined
response codes.
@param hostname Optional hostname to use in Warning header. Only used if
warning is also provided.
@param warning Optional warning text. If present a Warning header is added
and hostname is used in warning header.
@returns SipMessage populated with the appropriate response.
Caller must deallocate.
*/
static SipMessage* makeResponse(const SipMessage& request,
int responseCode,
const NameAddr& myContact,
const Data& reason = Data::Empty,
const Data& hostname = Data::Empty,
const Data& warning=Data::Empty);
static void makeRawResponse(Data& rawBuffer,
const SipMessage& request,
int responseCode,
const Data& additionalHeaders=Data::Empty,
const Data& body=Data::Empty);
/**
Make a 405 response to a provided request. Allows header is added
with specified methods, or with all methods the stack knows about.
Caller owns the returned pointer and is responsible for deleting it.
@param request SipMessage request from which to generate the response
@param allowedMethods Array of integers representing a list of Method
Types to add to the generated Allows header.
See MethodTypes.hxx.
@param nMethods Number of methods specified in the allowedMethods
integer array. Specify -1 to have this method fill
in the Allows header automatically with each method
supported by the stack.
@returns SipMessage populated with the appropriate response.
Caller must deallocate.
*/
static SipMessage* make405(const SipMessage& request,
const int* allowedMethods = 0,
int nMethods = -1);
/**
Returns the default reason string for a particular response code.
@param responseCode Response code to get reason for
@param reason Data where the reason string associated with the
responseCode will be set.
*/
static void getResponseCodeReason(int responseCode, Data& reason);
/**
Make a new request with a overridden Contact. To, maxforward=70, requestline
created, cseq method set, cseq sequence is 1, from and from tag set, contact
set, CallId created. Caller owns the returned pointer and is responsible for
deleting it.
@note While contact is only necessary for requests that establish a dialog,
those are the requests most likely created by this method, others will
be generated by the dialog.
@param target Ends up in the RequestURI and To header
@param from Ends up in the From header
@param contact Ends up in the Contact header. Stack will not change this
when sent.
@param method Type of request to create. Methos is used in the Request Line
and the CSeq.
@returns SipMessage request created. Caller must deallocate.
*/
static SipMessage* makeRequest(const NameAddr& target, const NameAddr& from, const NameAddr& contact, MethodTypes method);
/**
Make a new request. To, maxforward=70, requestline created, cseq method set,
cseq sequence is 1, from and from tag set, CallId created. Caller owns the
returned pointer and is responsible for deleting it.
@note An empty contact header is added. This signals to the stack that it
should be populated by the transports when sent.
@param target Ends up in the RequestURI and To header
@param from Ends up in the From header
@param method Type of request to create. Methos is used in the Request Line
and the CSeq.
@returns SipMessage request created. Caller must deallocate.
*/
static SipMessage* makeRequest(const NameAddr& target, const NameAddr& from, MethodTypes method);
/**
Make a new Cancel request for the specified request. Caller owns the
returned pointer and is responsible for deleting it.
@param request Request for which the Cancel will apply. ie. Invite request.
@returns Created Cancel request. Caller must deallocate.
*/
static SipMessage* makeCancel(const SipMessage& request);
/// Create a Register request with an overriden Contact. See makeRequest.
static SipMessage* makeRegister(const NameAddr& to, const NameAddr& from, const NameAddr& contact);
/// Create a Register request with an empty Contact. See makeRequest.
static SipMessage* makeRegister(const NameAddr& to, const NameAddr& from);
/// Create a Register request with an overriden Contact, transport is added to Request URI. See makeRequest.
static SipMessage* makeRegister(const NameAddr& to, const Data& transport, const NameAddr& contact);
/// Create a Register request with an empty Contact, transport is added to Request URI. See makeRequest.
static SipMessage* makeRegister(const NameAddr& to, const Data& transport);
/// Create a Subscribe request with an overriden Contact. See makeRequest.
static SipMessage* makeSubscribe(const NameAddr& target, const NameAddr& from, const NameAddr& contact);
/// Create a Subscribe request with an empty Contact. See makeRequest.
static SipMessage* makeSubscribe(const NameAddr& target, const NameAddr& from);
/// Create a Message request with an overriden Contact. See makeRequest.
static SipMessage* makeMessage(const NameAddr& target, const NameAddr& from, const NameAddr& contact);
/// Create a Message request with an empty Contact. See makeRequest.
static SipMessage* makeMessage(const NameAddr& target, const NameAddr& from);
/// Create a Publish request with an overriden Contact. See makeRequest.
static SipMessage* makePublish(const NameAddr& target, const NameAddr& from, const NameAddr& contact);
/// Create a Publish request with an empty Contact. See makeRequest.
static SipMessage* makePublish(const NameAddr& target, const NameAddr& from);
/**
This interface should be used by the stack (TransactionState) to create an
AckMsg to a failure response. See RFC3261 section 17.1.1.3. Caller owns the
returned pointer and is responsible for deleting it.
@note The branch in this ACK needs to be the one from the request.
For TU generated ACK, see Dialog::makeAck(...)
@param request Request that this ACK applies to.
@param response Response that we are ACKing - required so that we can get the To tag
into the generated ACK.
@returns Created Ack request. Caller must deallocate.
*/
static SipMessage* makeFailureAck(const SipMessage& request, const SipMessage& response);
/**
Creates and returns a unique branch parameter. Generated branch will contain
the RFC3261 magic cookie + 4 randome hex characters + "C1" + 2 random hex characters.
@deprecated Not used by stack.
*/
static Data computeUniqueBranch();
static Data computeProxyBranch(const SipMessage& request);
static Data computeCallId();
static Data computeTag(int numBytes);
enum AuthResult {Failed = 1, Authenticated, Expired, BadlyFormed};
static AuthResult authenticateRequest(const SipMessage& request,
const Data& realm,
const Data& password,
int expiresDelta = 0);
static AuthResult authenticateRequestWithA1(const SipMessage& request,
const Data& realm,
const Data& hA1,
int expiresDelta = 0);
static std::pair<AuthResult,Data>
advancedAuthenticateRequest(const SipMessage& request,
const Data& realm,
const Data& a1,
int expiresDelta = 0,
bool proxyAuthorization = true);
// create a 407 response with Proxy-Authenticate header filled in
static SipMessage* makeProxyChallenge(const SipMessage& request,
const Data& realm,
bool useAuth = true,
bool stale = false);
//create a 401 response with WWW-Authenticate header filled in
static SipMessage* makeWWWChallenge(const SipMessage& request,
const Data& realm,
bool useAuth = true,
bool stale = false);
// create a 401 or 407 response with Proxy-Authenticate or Authenticate header
// filled in
static SipMessage* makeChallenge(const SipMessage& request,
const Data& realm,
bool useAuth = true,
bool stale = false,
bool proxy = false);
static Data qopOption(const Auth& challenge);
static void updateNonceCount(unsigned int& nonceCount, Data& nonceCountString);
static bool algorithmAndQopSupported(const Auth& challenge);
// adds authorization headers in reponse to the 401 or 407--currently
// only supports md5.
static SipMessage& addAuthorization(SipMessage& request,
const SipMessage& challenge,
const Data& username,
const Data& password,
const Data& cnonce,
unsigned int& nonceCount);
static Auth makeChallengeResponseAuth(const SipMessage& request,
const Data& username,
const Data& password,
const Auth& challenge,
const Data& cnonce,
unsigned int& nonceCount,
Data& nonceCountString);
static void makeChallengeResponseAuth(const SipMessage& request,
const Data& username,
const Data& password,
const Auth& challenge,
const Data& cnonce,
const Data& authQop,
const Data& nonceCountString,
Auth& auth);
static Auth makeChallengeResponseAuthWithA1(const SipMessage& request,
const Data& username,
const Data& passwordHashA1,
const Auth& challenge,
const Data& cnonce,
unsigned int& nonceCount,
Data& nonceCountString);
static void makeChallengeResponseAuthWithA1(const SipMessage& request,
const Data& username,
const Data& passwordHashA1,
const Auth& challenge,
const Data& cnonce,
const Data& authQop,
const Data& nonceCountString,
Auth& auth);
static Data makeResponseMD5WithA1(const Data& a1,
const Data& method, const Data& digestUri, const Data& nonce,
const Data& qop = Data::Empty, const Data& cnonce = Data::Empty,
const Data& cnonceCount = Data::Empty, const Contents *entityBody = 0);
static Data makeResponseMD5(const Data& username, const Data& password, const Data& realm,
const Data& method, const Data& digestUri, const Data& nonce,
const Data& qop = Data::Empty, const Data& cnonce = Data::Empty,
const Data& cnonceCount = Data::Empty, const Contents *entityBody = 0);
/// Note: Helper assumes control of NonceHelper object and will delete when global scope is cleaned up
static void setNonceHelper(NonceHelper *nonceHelper);
static NonceHelper* getNonceHelper();
static Data makeNonce(const SipMessage& request, const Data& timestamp);
static Uri makeUri(const Data& aor, const Data& scheme=Symbols::DefaultSipScheme);
static void processStrictRoute(SipMessage& request);
// return the port that the response should be sent to using rules from
// RFC 3261 - 18.2.2
static int getPortForReply(SipMessage& request);
static void massageRoute(const SipMessage& request, NameAddr& route);
static Uri fromAor(const Data& aor, const Data& scheme=Symbols::DefaultSipScheme);
// Do basic checks to validate a received message off the wire
// If the basic check fails, and reason is non-null, reason will be set
// to the reason the check failed. This function does not take ownership
// of reason.
static bool validateMessage(const SipMessage& message,resip::Data* reason=0);
// GRUU support -- reversibly and opaquely combine instance id and aor
static Data gruuUserPart(const Data& instanceId,
const Data& aor,
const Data& key);
// GRUU support -- extract instance id and aor from user portion
static std::pair<Data,Data> fromGruuUserPart(const Data& gruuUserPart,
const Data& key);
struct ContentsSecAttrs
{
ContentsSecAttrs();
ContentsSecAttrs(std::auto_ptr<Contents> contents,
std::auto_ptr<SecurityAttributes> attributes);
ContentsSecAttrs(const ContentsSecAttrs& rhs);
ContentsSecAttrs& operator=(const ContentsSecAttrs& rhs);
mutable std::auto_ptr<Contents> mContents;
mutable std::auto_ptr<SecurityAttributes> mAttributes;
};
static ContentsSecAttrs extractFromPkcs7(const SipMessage& message, Security& security);
enum FailureMessageEffect{ DialogTermination, TransactionTermination, UsageTermination,
RetryAfter, OptionalRetryAfter, ApplicationDependant };
static FailureMessageEffect determineFailureMessageEffect(const SipMessage& response,
const std::set<int>* additionalTransactionTerminatingResponses = NULL);
// Just simply walk the contents tree and return the first SdpContents in
// the tree.
static std::auto_ptr<SdpContents> getSdp(Contents* tree);
/** Looks at SIP headers and message source for a mismatch to make an
assumption that the sender is behind a NAT device.
@param request Request message that we use for checking.
@privateToPublicOnly If enabled then we ensure that the via is private
address and that the source was a public address.
This allows us to ignore cases of private-private NAT'ing
or false detections, when a server behind a load balancer
is sending us requests and using the load balancer address
in the Via, instead of the real of the adapter.
*/
static bool isClientBehindNAT(const SipMessage& request, bool privateToPublicOnly=true);
/** Look at Via headers, and find the first public IP address closest to the sending
client.
@param request Request message that we use for checking.
@note If no public IP's are found, then an empty Tuple is returned. This
can be tested by checking if Tuple::getType() returns UNKNOWN_TRANSPORT.
*/
static Tuple getClientPublicAddress(const SipMessage& request);
private:
class NonceHelperPtr
{
public:
NonceHelperPtr() : mNonceHelper(0) {}
~NonceHelperPtr() { delete mNonceHelper; }
NonceHelper *mNonceHelper;
};
static NonceHelperPtr mNonceHelperPtr;
};
}
#endif
/* ====================================================================
* The Vovida Software License, Version 1.0
*
* Copyright (c) 2000 Vovida Networks, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
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* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The names "VOCAL", "Vovida Open Communication Application Library",
* and "Vovida Open Communication Application Library (VOCAL)" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact vocal@vovida.org.
*
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* ====================================================================
*
* This software consists of voluntary contributions made by Vovida
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