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/*
* Copyright (c) 2015-2016 Red Hat, Inc.
*
* All rights reserved.
*
* Author: Jan Friesse (jfriesse@redhat.com)
*
* This software licensed under BSD license, the text of which follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the Red Hat, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "msgio.h"
#include "msg.h"
#define MSGIO_LOCAL_BUF_SIZE (1 << 10)
/*
* -1 = send returned 0,
* -2 = unhandled error.
* 0 = success but whole buffer is still not sent
* 1 = all data was sent
*/
int
msgio_write(PRFileDesc *sock, const struct dynar *msg, size_t *already_sent_bytes)
{
PRInt32 sent;
PRInt32 to_send_i32;
size_t to_send;
to_send = dynar_size(msg) - *already_sent_bytes;
if (to_send > MSGIO_LOCAL_BUF_SIZE) {
to_send_i32 = MSGIO_LOCAL_BUF_SIZE;
} else {
to_send_i32 = (PRInt32)to_send;
}
sent = PR_Send(sock, dynar_data(msg) + *already_sent_bytes, to_send_i32, 0,
PR_INTERVAL_NO_TIMEOUT);
if (sent > 0) {
*already_sent_bytes += (size_t)sent;
if (*already_sent_bytes == dynar_size(msg)) {
/*
* All data sent
*/
return (1);
}
}
if (sent == 0) {
return (-1);
}
if (sent < 0 && PR_GetError() != PR_WOULD_BLOCK_ERROR) {
return (-2);
}
return (0);
}
/*
* 1 Full message received
* 0 Partial read (no error)
* -1 End of connection
* -2 Unhandled error
* -3 Fatal error. Unable to store message header
* -4 Unable to store message
* -5 Invalid msg type
* -6 Msg too long
*/
int
msgio_read(PRFileDesc *sock, struct dynar *msg, size_t *already_received_bytes, int *skipping_msg)
{
char local_read_buffer[MSGIO_LOCAL_BUF_SIZE];
PRInt32 readed;
size_t to_read;
PRInt32 to_read_i32;
int ret;
ret = 0;
if (*already_received_bytes < msg_get_header_length()) {
/*
* Complete reading of header
*/
to_read = msg_get_header_length() - *already_received_bytes;
} else {
/*
* Read rest of message (or at least as much as possible)
*/
to_read = (msg_get_header_length() + msg_get_len(msg)) - *already_received_bytes;
}
if (to_read > MSGIO_LOCAL_BUF_SIZE) {
to_read_i32 = MSGIO_LOCAL_BUF_SIZE;
} else {
to_read_i32 = (PRInt32)to_read;
}
readed = PR_Recv(sock, local_read_buffer, to_read_i32, 0, PR_INTERVAL_NO_TIMEOUT);
if (readed > 0) {
*already_received_bytes += (size_t)readed;
if (!*skipping_msg) {
if (dynar_cat(msg, local_read_buffer, readed) == -1) {
*skipping_msg = 1;
ret = -4;
}
}
if (*skipping_msg && *already_received_bytes < msg_get_header_length()) {
/*
* Fatal error. We were unable to store even message header
*/
return (-3);
}
if (!*skipping_msg && *already_received_bytes == msg_get_header_length()) {
/*
* Full header received. Check type, maximum size, ...
*/
if (!msg_is_valid_msg_type(msg)) {
*skipping_msg = 1;
ret = -5;
} else if ((msg_get_header_length() + msg_get_len(msg)) >
dynar_max_size(msg)) {
*skipping_msg = 1;
ret = -6;
}
}
if (*already_received_bytes >= msg_get_header_length() &&
*already_received_bytes == (msg_get_header_length() + msg_get_len(msg))) {
/*
* Full message skipped or received
*/
ret = 1;
}
}
if (readed == 0) {
return (-1);
}
if (readed < 0 && PR_GetError() != PR_WOULD_BLOCK_ERROR) {
return (-2);
}
return (ret);
}
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