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TFTP: Fix upload problem with piped input

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When input stream for curl is stdin and input stream is not a file but
generated by a script then curl can truncate data transfer to arbitrary
size since a partial packet is treated as end of transfer by TFTP.

Fixes #857
This commit is contained in:
Serj Kalichev 2016-08-03 00:29:09 +02:00 committed by Daniel Stenberg
parent 600bb4e852
commit edeabf741f
1 changed files with 15 additions and 3 deletions
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18
lib/tftp.c
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@ -705,6 +705,7 @@ static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event)
int rblock;
CURLcode result = CURLE_OK;
struct SingleRequest *k = &data->req;
int cb; /* Bytes currently read */
switch(event) {
@ -762,9 +763,20 @@ static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event)
return CURLE_OK;
}
result = Curl_fillreadbuffer(state->conn, state->blksize, &state->sbytes);
if(result)
return result;
/* TFTP considers data block size < 512 bytes as an end of session. So
* in some cases we must wait for additional data to build full (512 bytes)
* data block.
* */
state->sbytes = 0;
state->conn->data->req.upload_fromhere = (char *)state->spacket.data+4;
do {
result = Curl_fillreadbuffer(state->conn, state->blksize - state->sbytes,
&cb);
if(result)
return result;
state->sbytes += cb;
state->conn->data->req.upload_fromhere += cb;
} while(state->sbytes < state->blksize && cb != 0);
sbytes = sendto(state->sockfd, (void *) state->spacket.data,
4 + state->sbytes, SEND_4TH_ARG,