static void down_to_transport(CnetEvent ev, CnetTimer timer, CnetData data) {
/* our packet */
TR_PACKET p;
/* destination address to pass to network layer */
CnetAddr temp;
p.length = sizeof(p.msg);
CHECK(CNET_read_application(&temp, p.msg, &p.length));
CNET_disable_application(temp);
/* establish sequence number */
unsigned long seq = getSequence(temp);
if( seq == -1) {
addAddress(temp,0);
p.sequence_number = 0;
}
else {
unsigned long newseq = seq + p.length;
setSequence(temp,newseq);
p.sequence_number = newseq;
}
p.checksum = checksum_crc32( ((char*)&p)+sizeof(unsigned int)
, TR_PACKET_SIZE(p) - sizeof(unsigned int));
down_to_network( (char*)&p , TR_PACKET_SIZE(p) , temp);
/* enqueuePacket((char*)&p, TR_PACKET_SIZE(p), temp); */
CNET_start_timer(EV_TIMER1, 1000, (CnetData)1);
}
static void up_to_transport(char *msg, int *len, CnetAddr source) {
printf("Transport Layer is getting a packet\n");
TR_PACKET *p;
p = (TR_PACKET*) msg;
if( p->checksum == checksum_crc32( msg + sizeof(unsigned int),
TR_PACKET_SIZE_PTR(p) - sizeof(unsigned int)) ) {
/* good packet */
printf("Mmmm...Good packet\n");
CHECK(CNET_write_application(p->msg,&(p->length)));
}
else {
/* bad packet */
printf("Bad, bad packet!\n");
}
}
/**
Tests the checksum algorithm used for the binary log, and asserts in case
if the checksum algorithm is invalid.
@param event_buf point to the buffer containing serialized event
@param event_len length of the event accounting possible
checksum alg
@param alg checksum algorithm used for the binary log
@retval true if test fails
@retval false as success
*/
bool Log_event_footer::event_checksum_test(unsigned char *event_buf,
unsigned long event_len,
enum_binlog_checksum_alg alg)
{
bool res= false;
unsigned short flags= 0; // to store in FD's buffer flags orig value
if (alg != BINLOG_CHECKSUM_ALG_OFF && alg != BINLOG_CHECKSUM_ALG_UNDEF)
{
uint32_t incoming;
uint32_t computed;
if (event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT)
{
#ifndef DBUG_OFF
unsigned char fd_alg= event_buf[event_len - BINLOG_CHECKSUM_LEN -
BINLOG_CHECKSUM_ALG_DESC_LEN];
#endif
/*
FD event is checksummed and therefore verified w/o
the binlog-in-use flag.
*/
memcpy(&flags, event_buf + FLAGS_OFFSET, sizeof(flags));
flags= le16toh(flags);
if (flags & LOG_EVENT_BINLOG_IN_USE_F)
event_buf[FLAGS_OFFSET] &= ~LOG_EVENT_BINLOG_IN_USE_F;
/*
The only algorithm currently is CRC32. Zero indicates
the binlog file is checksum-free *except* the FD-event.
*/
#ifndef DBUG_OFF
BAPI_ASSERT(fd_alg == BINLOG_CHECKSUM_ALG_CRC32 || fd_alg == 0);
#endif
BAPI_ASSERT(alg == BINLOG_CHECKSUM_ALG_CRC32);
/*
Complile time guard to watch over the max number of alg
*/
do_compile_time_assert(BINLOG_CHECKSUM_ALG_ENUM_END <= 0x80);
}
memcpy(&incoming,
event_buf + event_len - BINLOG_CHECKSUM_LEN, sizeof(incoming));
incoming= le32toh(incoming);
computed= checksum_crc32(0L, NULL, 0);
/* checksum the event content but not the checksum part itself */
computed= binary_log::checksum_crc32(computed,
(const unsigned char*) event_buf,
event_len - BINLOG_CHECKSUM_LEN);
if (flags != 0)
{
/* restoring the orig value of flags of FD */
BAPI_ASSERT(event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT);
event_buf[FLAGS_OFFSET]= static_cast<unsigned char>(flags);
}
res= !(computed == incoming);
}
#ifndef DBUG_OFF
if (binary_log_debug::debug_checksum_test)
return true;
#endif
return res;
}
