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Ensure we discard unread/unsent data when abandoning a connection attempt.

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There are assorted situations wherein PQconnectPoll() will abandon a
connection attempt and try again with different parameters (eg, SSL versus
not SSL).  However, the code forgot to discard any pending data in libpq's
I/O buffers when doing this.  In at least one case (server returns E
message during SSL negotiation), there is unread input data which bollixes
the next connection attempt.  I have not checked to see whether this is
possible in the other cases where we close the socket and retry, but it
seems like a matter of good defensive programming to add explicit
buffer-flushing code to all of them.

This is one of several issues exposed by Daniel Farina's report of
misbehavior after a server-side fork failure.

This has been wrong since forever, so back-patch to all supported branches.
This commit is contained in:
Tom Lane 2011-08-27 14:16:14 -04:00
parent 4bd7333b14
commit 724e30c9f8
1 changed files with 18 additions and 0 deletions
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18
src/interfaces/libpq/fe-connect.c
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@ -2068,6 +2068,9 @@ keep_going: /* We will come back to here until there is
closesocket(conn->sock);
conn->sock = -1;
conn->status = CONNECTION_NEEDED;
/* Discard any unread/unsent data */
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
goto keep_going;
}
else
@ -2105,6 +2108,9 @@ keep_going: /* We will come back to here until there is
closesocket(conn->sock);
conn->sock = -1;
conn->status = CONNECTION_NEEDED;
/* Discard any unread/unsent data */
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
goto keep_going;
}
}
@ -2218,6 +2224,9 @@ keep_going: /* We will come back to here until there is
closesocket(conn->sock);
conn->sock = -1;
conn->status = CONNECTION_NEEDED;
/* Discard any unread/unsent data */
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
goto keep_going;
}
@ -2285,6 +2294,9 @@ keep_going: /* We will come back to here until there is
closesocket(conn->sock);
conn->sock = -1;
conn->status = CONNECTION_NEEDED;
/* Discard any unread/unsent data */
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
goto keep_going;
}
@ -2304,6 +2316,9 @@ keep_going: /* We will come back to here until there is
closesocket(conn->sock);
conn->sock = -1;
conn->status = CONNECTION_NEEDED;
/* Discard any unread/unsent data */
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
goto keep_going;
}
#endif
@ -2467,6 +2482,9 @@ keep_going: /* We will come back to here until there is
closesocket(conn->sock);
conn->sock = -1;
conn->status = CONNECTION_NEEDED;
/* Discard any unread/unsent data */
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
goto keep_going;
}
}