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/*
* ProFTPD - mod_proxy FTP data conn routines
* Copyright (c) 2012-2020 TJ Saunders
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#include "mod_proxy.h"
#include "proxy/netio.h"
#include "proxy/ftp/data.h"
static const char *trace_channel = "proxy.ftp.data";
pr_buffer_t *proxy_ftp_data_recv(pool *p, conn_t *data_conn,
int frontend_data) {
int nread;
pr_buffer_t *pbuf = NULL;
if (p == NULL ||
data_conn == NULL ||
data_conn->instrm == NULL) {
errno = EINVAL;
return NULL;
}
if (data_conn->instrm->strm_buf != NULL) {
pbuf = data_conn->instrm->strm_buf;
} else {
pbuf = pr_netio_buffer_alloc(data_conn->instrm);
}
pbuf->current = pbuf->buf;
pbuf->remaining = pbuf->buflen;
while (TRUE) {
size_t avail_len;
if (frontend_data) {
nread = pr_netio_read(data_conn->instrm, pbuf->current,
pbuf->remaining, 1);
} else {
nread = proxy_netio_read(data_conn->instrm, pbuf->current,
pbuf->remaining, 1);
}
if (nread < 0) {
return NULL;
}
if (nread == 0) {
/* We might have had data left over in the buffer from a previous
* iteration of the loop, thus we return it as is.
*/
return pbuf;
}
pr_timer_reset(PR_TIMER_NOXFER, ANY_MODULE);
pr_timer_reset(PR_TIMER_STALLED, ANY_MODULE);
pr_timer_reset(PR_TIMER_IDLE, ANY_MODULE);
pr_trace_msg(trace_channel, 15, "received %d bytes of data", nread);
pbuf->current += nread;
pbuf->remaining -= nread;
pr_event_generate("mod_proxy.data-read", pbuf);
/* How much data is available in the buffer? It is possible that
* event listeners consumed that data entirely. If there is no available
* data left, we need to read more.
*/
avail_len = pbuf->current - pbuf->buf;
if (avail_len > 0) {
break;
}
}
return pbuf;
}
int proxy_ftp_data_send(pool *p, conn_t *data_conn, pr_buffer_t *pbuf,
int frontend_data) {
int nwrote;
char *buf;
size_t buflen;
if (p == NULL ||
data_conn == NULL ||
data_conn->outstrm == NULL ||
pbuf == NULL) {
errno = EINVAL;
return -1;
}
pr_event_generate("mod_proxy.data-write", pbuf);
/* Currently, we make the conn_t nonblocking (via pr_inet_set_nonblocking),
* BUT that does NOT set the nonblocking flag on the contained stream.
* Thus this write is actually a BLOCKING write -- which means that we will
* not need to worry about short writes here.
*
* In the future, we may want to make the streams nonblocking, but that
* makes mod_proxy a little more sensitive to the slow producer/consumer
* problem.
*/
buf = pbuf->buf;
buflen = pbuf->current - pbuf->buf;
pr_trace_msg(trace_channel, 25, "writing %lu bytes of data to %s",
(unsigned long) buflen,
frontend_data ? "frontend client" : "backend server");
if (frontend_data) {
nwrote = pr_netio_write(data_conn->outstrm, buf, buflen);
} else {
nwrote = proxy_netio_write(data_conn->outstrm, buf, buflen);
}
while (nwrote < 0) {
int xerrno = errno;
if (xerrno == EAGAIN) {
/* Since our socket is in non-blocking mode, write(2) can return
* EAGAIN if there is not enough from for our data yet. Handle
* this by delaying temporarily, then trying again.
*/
errno = EINTR;
pr_signals_handle();
if (frontend_data) {
nwrote = pr_netio_write(data_conn->outstrm, buf, buflen);
} else {
nwrote = proxy_netio_write(data_conn->outstrm, buf, buflen);
}
continue;
}
errno = xerrno;
return -1;
}
pr_timer_reset(PR_TIMER_NOXFER, ANY_MODULE);
pr_timer_reset(PR_TIMER_STALLED, ANY_MODULE);
pr_timer_reset(PR_TIMER_IDLE, ANY_MODULE);
return nwrote;
}
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