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queue.cpp File Reference

#include "private.h"
#include <ccrtp/queuebase.h>
#include <ccrtp/ioqueue.h>
#include <cstdio>
#include <cstring>

Go to the source code of this file.

Namespaces

namespace  ccMD5
namespace  std

Classes

class  Digest
 base class for hashing services. More...
class  MD5Digest
 md5 hash accumulation. More...

Defines

#define S11   7
#define S12   12
#define S13   17
#define S14   22
#define S21   5
#define S22   9
#define S23   14
#define S24   20
#define S31   4
#define S32   11
#define S33   16
#define S34   23
#define S41   6
#define S42   10
#define S43   15
#define S44   21

Functions

static unsigned long ccMD5::rotate_left (unsigned long x, unsigned long n)
static unsigned long ccMD5::F (unsigned long x, unsigned long y, unsigned long z)
static unsigned long ccMD5::G (unsigned long x, unsigned long y, unsigned long z)
static unsigned long ccMD5::H (unsigned long x, unsigned long y, unsigned long z)
static unsigned long ccMD5::md5I (unsigned long x, unsigned long y, unsigned long z)
static void ccMD5::FF (unsigned long &a, unsigned long b, unsigned long c, unsigned long d, unsigned long x, unsigned long s, unsigned long ac)
static void ccMD5::GG (unsigned long &a, unsigned long b, unsigned long c, unsigned long d, unsigned long x, unsigned long s, unsigned long ac)
static void ccMD5::HH (unsigned long &a, unsigned long b, unsigned long c, unsigned long d, unsigned long x, unsigned long s, unsigned long ac)
static void ccMD5::II (unsigned long &a, unsigned long b, unsigned long c, unsigned long d, unsigned long x, unsigned long s, unsigned long ac)
static uint32 MD5BasedRandom32 ()
uint32 random32 ()
uint16 random16 ()

Define Documentation

#define S11   7
 

Definition at line 163 of file queue.cpp.

Referenced by MD5Digest::update().

#define S12   12
 

Definition at line 164 of file queue.cpp.

Referenced by MD5Digest::update().

#define S13   17
 

Definition at line 165 of file queue.cpp.

Referenced by MD5Digest::update().

#define S14   22
 

Definition at line 166 of file queue.cpp.

Referenced by MD5Digest::update().

#define S21   5
 

Definition at line 167 of file queue.cpp.

Referenced by MD5Digest::update().

#define S22   9
 

Definition at line 168 of file queue.cpp.

Referenced by MD5Digest::update().

#define S23   14
 

Definition at line 169 of file queue.cpp.

Referenced by MD5Digest::update().

#define S24   20
 

Definition at line 170 of file queue.cpp.

Referenced by MD5Digest::update().

#define S31   4
 

Definition at line 171 of file queue.cpp.

Referenced by MD5Digest::update().

#define S32   11
 

Definition at line 172 of file queue.cpp.

Referenced by MD5Digest::update().

#define S33   16
 

Definition at line 173 of file queue.cpp.

Referenced by MD5Digest::update().

#define S34   23
 

Definition at line 174 of file queue.cpp.

Referenced by MD5Digest::update().

#define S41   6
 

Definition at line 175 of file queue.cpp.

Referenced by MD5Digest::update().

#define S42   10
 

Definition at line 176 of file queue.cpp.

Referenced by MD5Digest::update().

#define S43   15
 

Definition at line 177 of file queue.cpp.

Referenced by MD5Digest::update().

#define S44   21
 

Definition at line 178 of file queue.cpp.

Referenced by MD5Digest::update().

Function Documentation

static uint32 MD5BasedRandom32 (   )  [static]
 

Definition at line 454 of file queue.cpp.

References defaultApplication(), MD5Digest::getDigest(), MD5Digest::putDigest(), and SDESItemTypeCNAME.

Referenced by random32().

00455 {
00456         // This is the input to the MD5 algorithm.
00457         union {
00458                 uint8 array[1];
00459                 struct {
00460                         timeval time;
00461                         void *address;
00462                         uint8 cname[10];
00463                 } data;
00464         } message;
00465 
00466         // the output from the MD5 algorithm will be put here.
00467         union {
00468                 uint32 buf32[4];
00469                 uint8 buf8[16];
00470         } digest;
00471 
00472         gettimeofday(&(message.data.time),NULL);
00473         message.array[0] =
00474                 static_cast<uint8>(message.data.time.tv_sec *
00475                                    message.data.time.tv_usec);
00476 
00477         message.data.address = &message;
00478         memcpy(message.data.cname,
00479                defaultApplication().getSDESItem(SDESItemTypeCNAME).c_str(),10);
00480 
00481         // compute MD5.
00482         ccMD5::MD5Digest md5;
00483         md5.putDigest(reinterpret_cast<unsigned char*>(message.array),
00484                       sizeof(message));
00485         md5.getDigest(reinterpret_cast<unsigned char*>(digest.buf8));
00486 
00487         // Get result as xor of the four 32-bit words from the MD5 algorithm.
00488         uint32 result = 0;
00489         for ( int i = 0; i < 4; i ++ )
00490                 result ^= digest.buf32[i];
00491         return result;
00492 }

uint16 random16 (   ) 
 

Definition at line 516 of file queue.cpp.

References random32().

Referenced by OutgoingDataQueue::OutgoingDataQueue().

00517 {
00518         uint32 r32 = random32();
00519         uint16 r16 = r32 & (r32 >> 16);
00520         return r16;
00521 }

uint32 random32 (   ) 
 

Definition at line 494 of file queue.cpp.

References MD5BasedRandom32().

Referenced by OutgoingDataQueue::OutgoingDataQueue(), random16(), IncomingDataQueue::renewLocalSSRC(), and RTPQueueBase::RTPQueueBase().

00495 {
00496         // If /dev/urandom fails, default to the MD5 based algorithm
00497         // given in the RTP specification.
00498         uint32 number;
00499 #ifndef WIN32
00500         bool success = true;
00501         int fd = open("/dev/urandom",O_RDONLY);
00502         if (fd == -1) {
00503                 success = false;
00504         } else {
00505                 if ( read(fd,&number,sizeof(number)) != sizeof(number) ) {
00506                         success = false;
00507                 }
00508         }
00509         close(fd);
00510         if ( !success )
00511 #endif
00512                 number = MD5BasedRandom32();
00513         return number;
00514 }

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