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Fix muti-result handling in modutil_count_signal_packets

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The function assumed that the buffer would not contain a trailing OK
packet that completes a multi-result response.
This commit is contained in:
Markus Mäkelä 2017-10-10 07:14:05 +03:00 committed by Johan Wikman
parent a04843da9d
commit 426f80c8ef
1 changed files with 20 additions and 4 deletions
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24
server/core/modutil.cc
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@ -25,6 +25,7 @@
#include <maxscale/poll.h>
#include <maxscale/protocol/mysql.h>
#include <maxscale/utils.h>
#include <maxscale/mysql_utils.h>
/** These are used when converting MySQL wildcards to regular expressions */
static SPINLOCK re_lock = SPINLOCK_INIT;
@ -627,13 +628,14 @@ GWBUF* modutil_get_complete_packets(GWBUF **p_readbuf)
return complete;
}
int modutil_count_signal_packets(GWBUF *reply, int n_found, bool* more, modutil_state* state)
int modutil_count_signal_packets(GWBUF *reply, int n_found, bool* more_dest, modutil_state* state)
{
unsigned int len = gwbuf_length(reply);
int eof = 0;
int err = 0;
size_t offset = 0;
bool skip_next = state ? state->state : false;
bool more = false;
while (offset < len)
{
@ -664,15 +666,28 @@ int modutil_count_signal_packets(GWBUF *reply, int n_found, bool* more, modutil_
{
eof++;
}
else if (more && command == MYSQL_REPLY_OK)
{
// This should not be the first packet
ss_dassert(pktlen >= MYSQL_OK_PACKET_MIN_LEN && offset > 0);
uint8_t data[payloadlen - 1];
gwbuf_copy_data(reply, offset + MYSQL_HEADER_LEN + 1, sizeof(data), data);
uint8_t* ptr = data;
ptr += mxs_leint_bytes(ptr);
ptr += mxs_leint_bytes(ptr);
uint16_t* status = (uint16_t*)ptr;
more = (*status) & SERVER_MORE_RESULTS_EXIST;
}
}
if (offset + pktlen >= len || (eof + err + n_found) >= 2)
{
gwbuf_copy_data(reply, offset, sizeof(header), header);
uint16_t* status = (uint16_t*)(header + MYSQL_HEADER_LEN + 1 + 2); // Skip command and warning count
*more = ((*status) & SERVER_MORE_RESULTS_EXIST);
offset += pktlen;
break;
more = ((*status) & SERVER_MORE_RESULTS_EXIST);
}
offset += pktlen;
@ -690,6 +705,7 @@ int modutil_count_signal_packets(GWBUF *reply, int n_found, bool* more, modutil_
state->state = skip_next;
}
*more_dest = more;
return total;
}