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dataxfer.c
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/*
* ser2net - A program for allowing telnet connection to serial ports
* Copyright (C) 2001-2020 Corey Minyard <[email protected]>
*
* SPDX-License-Identifier: GPL-2.0-only
*
* In addition, as a special exception, the copyright holders of
* ser2net give you permission to combine ser2net with free software
* programs or libraries that are released under the GNU LGPL and
* with code included in the standard release of OpenSSL under the
* OpenSSL license (or modified versions of such code, with unchanged
* license). You may copy and distribute such a system following the
* terms of the GNU GPL for ser2net and the licenses of the other code
* concerned, provided that you include the source code of that
* other code when and as the GNU GPL requires distribution of source
* code.
*
* Note that people who make modified versions of ser2net are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version
* without this exception; this exception also makes it possible to
* release a modified version which carries forward this exception.
*/
/* This code handles the actual transfer of data between the serial
ports and the TCP ports. */
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <syslog.h>
#include <assert.h>
#include <gensio/gensio.h>
#include <gensio/sergensio.h>
#include "port.h"
#include "ser2net.h"
#include "dataxfer.h"
#include "readconfig.h"
#include "led.h"
/* For tracing. */
#define SERIAL "term"
#define NET "tcp "
static void setup_port(port_info_t *port, net_info_t *netcon);
static int handle_net_event(struct gensio *net, void *user_data,
int event, int err,
unsigned char *buf, gensiods *buflen,
const char *const *auxdata);
static int
all_net_connectbacks_done(port_info_t *port)
{
net_info_t *netcon;
for_each_connection(port, netcon) {
if (netcon->connect_back && !netcon->net)
return false;
}
return true;
}
static bool
any_net_data_to_write(port_info_t *port)
{
net_info_t *netcon;
for_each_connection(port, netcon) {
if (!netcon->net)
continue;
if (netcon->write_pos < port->dev_to_net.cursize)
return true;
}
return false;
}
static void
start_net_send(port_info_t *port)
{
net_info_t *netcon;
if (port->dev_to_net_state == PORT_WAITING_OUTPUT_CLEAR)
return;
gensio_set_read_callback_enable(port->io, false);
for_each_connection(port, netcon) {
if (!netcon->net)
continue;
netcon->write_pos = 0;
gensio_set_write_callback_enable(netcon->net, true);
}
port->dev_to_net_state = PORT_WAITING_OUTPUT_CLEAR;
}
static void
disable_all_net_read(port_info_t *port)
{
net_info_t *netcon;
for_each_connection(port, netcon) {
if (netcon->net)
gensio_set_read_callback_enable(netcon->net, false);
}
}
static void
enable_all_net_read(port_info_t *port)
{
net_info_t *netcon;
for_each_connection(port, netcon) {
if (netcon->net)
gensio_set_read_callback_enable(netcon->net, true);
}
}
static void
report_newcon(port_info_t *port, net_info_t *netcon)
{
if (!net_raddr_str(netcon->net, netcon->remaddr, sizeof(netcon->remaddr)))
strcpy(netcon->remaddr, "*unknown*");
cntlr_report_conchange("new connection", port->name, netcon->remaddr);
}
void
report_disconnect(port_info_t *port, net_info_t *netcon)
{
cntlr_report_conchange("disconnect", port->name, netcon->remaddr);
}
static void
connect_back_done(struct gensio *net, int err, void *cb_data)
{
net_info_t *netcon = cb_data;
port_info_t *port = netcon->port;
so->lock(port->lock);
if (err) {
netcon->net = NULL;
gensio_free(net);
} else {
report_newcon(port, netcon);
setup_port(port, netcon);
}
assert(port->num_waiting_connect_backs > 0);
port->num_waiting_connect_backs--;
if (port->num_waiting_connect_backs == 0) {
if (!all_net_connectbacks_done(port))
/* Not all connections back could be made. */
port->nocon_read_enable_time_left = port->accepter_retry_time;
else
gensio_set_read_callback_enable(port->io, true);
}
so->unlock(port->lock);
}
static int
port_check_connect_backs(port_info_t *port)
{
net_info_t *netcon;
bool tried = false;
if (!port->connbacks)
return 0;
if (port->net_to_dev_state == PORT_CLOSING) {
/*
* Some data came in while we were shutting down the port.
* Just ignore it for now, when the port is opened back up we
* wills tart the connections.
*/
return 1;
}
for_each_connection(port, netcon) {
if (netcon->connect_back && !netcon->net) {
int err;
tried = true;
err = gensio_acc_str_to_gensio(port->accepter, netcon->remote_str,
handle_net_event, netcon,
&netcon->net);
if (err) {
syslog(LOG_ERR, "Unable to allocate connect back port %s,"
" addr %s: %s\n", port->name, netcon->remote_str,
gensio_err_to_str(err));
continue;
}
err = gensio_open(netcon->net, connect_back_done, netcon);
if (err) {
gensio_free(netcon->net);
netcon->net = NULL;
syslog(LOG_ERR, "Unable to open connect back port %s,"
" addr %s: %s\n", port->name, netcon->remote_str,
gensio_err_to_str(err));
continue;
}
port->num_waiting_connect_backs++;
}
}
if (tried && !port->num_waiting_connect_backs && !num_connected_net(port)) {
/*
* This is kind of a bad situation. We got some data, attempted
* connects, but failed. Shut down the read enable for a while.
*/
port->nocon_read_enable_time_left = port->accepter_retry_time;
}
return port->num_waiting_connect_backs;
}
/* Data is ready to read on the serial port. */
static int
handle_dev_read(port_info_t *port, int err, unsigned char *buf,
gensiods buflen)
{
gensiods count = 0;
bool send_now = false;
int nr_handlers = 0;
so->lock(port->lock);
if (port->dev_to_net_state != PORT_WAITING_INPUT) {
gensio_set_read_callback_enable(port->io, false);
goto out_unlock;
}
if (err) {
if (port->dev_to_net.cursize) {
/* Let the output drain before shutdown. */
count = 0;
send_now = true;
goto do_send;
}
/* Got an error on the read, shut down the port. */
syslog(LOG_ERR, "dev read error for device on port %s: %s",
port->name, gensio_err_to_str(err));
shutdown_port(port, "dev read error");
}
nr_handlers = port_check_connect_backs(port);
if (nr_handlers > 0) {
gensio_set_read_callback_enable(port->io, false);
goto out_unlock;
}
if (port->no_dev_to_net) {
count = buflen;
goto out_unlock;
}
if (gbuf_room_left(&port->dev_to_net) < buflen)
buflen = gbuf_room_left(&port->dev_to_net);
count = buflen;
if (count == 0) {
gensio_set_read_callback_enable(port->io, false);
goto out_unlock;
}
if (port->closeon) {
int i;
for (i = 0; i < count; i++) {
if (buf[i] == port->closeon[port->closeon_pos]) {
port->closeon_pos++;
if (port->closeon_pos >= port->closeon_len) {
net_info_t *netcon;
for_each_connection(port, netcon)
netcon->close_on_output_done = true;
/* Ignore everything after the closeon string */
count = i + 1;
break;
}
} else {
port->closeon_pos = 0;
}
}
}
if (port->tr)
/* Do read tracing, ignore errors. */
do_trace(port, port->tr, buf, count, SERIAL);
if (port->tb)
/* Do both tracing, ignore errors. */
do_trace(port, port->tb, buf, count, SERIAL);
if (port->led_rx)
led_flash(port->led_rx);
if (port->dev_monitor != NULL)
controller_write(port->dev_monitor, (char *) buf, count);
do_send:
if (nr_handlers < 0) /* Nobody to handle the data. */
goto out_unlock;
if (port->sendon_len != 0) {
int i;
for (i = 0; i < count; i++) {
if (buf[i] == port->sendon[port->sendon_pos]) {
port->sendon_pos++;
if (port->sendon_pos >= port->sendon_len) {
count = i + 1;
send_now = true;
port->sendon_pos = 0;
break;
}
} else {
port->sendon_pos = 0;
}
}
}
gbuf_append(&port->dev_to_net, buf, count);
port->dev_bytes_received += count;
if (send_now || gbuf_room_left(&port->dev_to_net) == 0 ||
port->chardelay == 0) {
send_it:
start_net_send(port);
} else {
gensio_time then;
int delay;
so->get_monotonic_time(so, &then);
if (port->send_timer_running) {
so->stop_timer(port->send_timer);
} else {
port->send_time = then;
add_usec_to_time(&port->send_time, port->chardelay_max);
}
delay = sub_time(&port->send_time, &then);
if (delay > port->chardelay)
delay = port->chardelay;
else if (delay < 0) {
port->send_timer_running = false;
goto send_it;
}
add_usec_to_time(&then, delay);
so->start_timer_abs(port->send_timer, &then);
port->send_timer_running = true;
}
out_unlock:
so->unlock(port->lock);
return count;
}
static void
handle_dev_write_ready(port_info_t *port)
{
so->lock(port->lock);
port->dev_write_handler(port);
so->unlock(port->lock);
}
int
handle_dev_event(struct gensio *io, void *user_data, int event, int err,
unsigned char *buf, gensiods *buflen,
const char *const *auxdata)
{
port_info_t *port = user_data;
net_info_t *netcon;
gensiods len = 0;
if (buflen)
len = *buflen;
switch (event) {
case GENSIO_EVENT_READ:
if (gensio_str_in_auxdata(auxdata, "oob"))
/* Ignore out of bound data. */
return 0;
len = handle_dev_read(port, err, buf, len);
if (buflen)
*buflen = len;
return 0;
case GENSIO_EVENT_WRITE_READY:
handle_dev_write_ready(port);
return 0;
case GENSIO_EVENT_SER_MODEMSTATE:
so->lock(port->lock);
port->last_modemstate = *((unsigned int *) buf);
for_each_connection(port, netcon) {
struct sergensio *sio;
if (!netcon->net)
continue;
sio = gensio_to_sergensio(netcon->net);
if (!sio)
continue;
/*
* The 0xf below is non-standard, but the spec makes no
* sense in this case. From what I can tell, the
* modemstate top 4 bits is the settings, and the bottom 4
* bits is telling you what changed. So you don't want to
* report a value unless something changed, and only if it
* was in the modemstate mask.
*/
if (port->last_modemstate & netcon->modemstate_mask & 0xf)
sergensio_modemstate(sio, (port->last_modemstate &
netcon->modemstate_mask));
}
so->unlock(port->lock);
return 0;
case GENSIO_EVENT_SER_LINESTATE:
so->lock(port->lock);
port->last_linestate = *((unsigned int *) buf);
for_each_connection(port, netcon) {
struct sergensio *sio;
if (!netcon->net)
continue;
sio = gensio_to_sergensio(netcon->net);
if (!sio)
continue;
if (port->last_linestate & netcon->linestate_mask)
sergensio_linestate(sio, (port->last_linestate &
netcon->linestate_mask));
}
so->unlock(port->lock);
return 0;
#ifdef GENSIO_EVENT_PARMLOG
case GENSIO_EVENT_PARMLOG: {
struct gensio_parmlog_data *d = (struct gensio_parmlog_data *) buf;
vsyslog(LOG_ERR, d->log, d->args);
return 0;
}
#endif
default:
return GE_NOTSUP;
}
}
void
port_send_timeout(struct gensio_timer *timer, void *data)
{
port_info_t *port = (port_info_t *) data;
so->lock(port->lock);
port->send_timer_running = false;
if (port->dev_to_net_state == PORT_CLOSING ||
port->dev_to_net_state == PORT_CLOSED) {
so->unlock(port->lock);
return;
}
if (port->dev_to_net.cursize)
start_net_send(port);
so->unlock(port->lock);
}
int
gbuf_write(port_info_t *port, struct gbuf *buf)
{
int err;
gensiods written;
err = gensio_write(port->io, &written, buf->buf + buf->pos,
buf->cursize - buf->pos, NULL);
if (err)
return err;
buf->pos += written;
port->dev_bytes_sent += written;
if (buf->pos >= buf->cursize)
gbuf_reset(buf);
return 0;
}
/* The serial port has room to write some data. This is only activated
if a write fails to complete, it is deactivated as soon as writing
is available again. */
static void
dev_fd_write(port_info_t *port, struct gbuf *buf)
{
int err;
err = gbuf_write(port, buf);
if (err) {
syslog(LOG_ERR, "The dev write for port %s had error: %s",
port->name, gensio_err_to_str(err));
shutdown_port(port, "dev write error");
return;
}
if (gbuf_cursize(buf) == 0) {
/* We are done writing, turn the reader back on. */
enable_all_net_read(port);
gensio_set_write_callback_enable(port->io, false);
port->net_to_dev_state = PORT_WAITING_INPUT;
}
}
static void
handle_dev_fd_normal_write(port_info_t *port)
{
dev_fd_write(port, &port->net_to_dev);
}
/* Output the devstr buffer */
static void
handle_dev_fd_devstr_write(port_info_t *port)
{
dev_fd_write(port, port->devstr);
if (gbuf_cursize(port->devstr) == 0) {
port->dev_write_handler = handle_dev_fd_normal_write;
gbuf_free(port->devstr);
port->devstr = NULL;
/* Send out any data we got on the TCP port. */
handle_dev_fd_normal_write(port);
}
}
/* Data is ready to read on the network port. */
static gensiods
handle_net_fd_read(net_info_t *netcon, struct gensio *net, int readerr,
unsigned char *buf, gensiods buflen)
{
port_info_t *port = netcon->port;
gensiods rv = 0;
char *reason;
int err;
so->lock(port->lock);
if (port->net_to_dev_state == PORT_WAITING_OUTPUT_CLEAR)
/* Catch a race here. */
goto out_unlock;
if (readerr) {
if (readerr == GE_REMCLOSE) {
reason = "network read close";
} else {
/* Got an error on the read, shut down the port. */
syslog(LOG_ERR, "read error for port %s: %s", port->name,
gensio_err_to_str(readerr));
reason = "network read error";
}
goto out_shutdown;
}
if (port->no_net_to_dev) {
rv = buflen;
goto out_unlock;
}
if (buflen > port->net_to_dev.maxsize)
buflen = port->net_to_dev.maxsize;
netcon->bytes_received += buflen;
if (port->net_monitor != NULL)
controller_write(port->net_monitor, (char *) buf, buflen);
if (port->tw)
/* Do write tracing, ignore errors. */
do_trace(port, port->tw, buf, buflen, NET);
if (port->tb)
/* Do both tracing, ignore errors. */
do_trace(port, port->tb, buf, buflen, NET);
memcpy(port->net_to_dev.buf, buf, buflen);
port->net_to_dev.cursize = buflen;
port->net_to_dev.pos = 0;
/*
* Don't write anything to the device until devstr is written.
* This can happen on UDP ports, we get the first packet before
* the port is enabled, so there will be data in the output buffer
* but there will also possibly be devstr data. We want the
* devstr data to go out first.
*/
if (port->devstr)
goto stop_read_start_write;
err = gbuf_write(port, &port->net_to_dev);
if (err) {
syslog(LOG_ERR, "The dev write(2) for port %s had error: %s",
port->name, gensio_err_to_str(err));
shutdown_port(port, "dev write error");
rv = buflen;
goto out_unlock;
} else {
if (port->led_tx)
led_flash(port->led_tx);
}
if (gbuf_cursize(&port->net_to_dev)) {
/* We didn't write all the data, shut off the reader and
start the write monitor. */
stop_read_start_write:
disable_all_net_read(port);
gensio_set_write_callback_enable(port->io, true);
port->net_to_dev_state = PORT_WAITING_OUTPUT_CLEAR;
}
reset_timer(netcon);
rv = buflen;
out_unlock:
so->unlock(port->lock);
return rv;
out_shutdown:
shutdown_one_netcon(netcon, reason);
goto out_unlock;
}
/*
* Write some network data from a buffer. Returns -1 on something
* causing the netcon to shut down, 0 if the write was incomplete, and
* 1 if the write was completed.
*/
static int
net_fd_write(port_info_t *port, net_info_t *netcon,
struct gbuf *buf, gensiods *pos)
{
int reterr, to_send;
gensiods count = 0;
to_send = buf->cursize - *pos;
if (to_send <= 0)
/* Don't send empty packets, that can confuse UDP clients. */
return 1;
/* Can't use buffer send operation here, multiple writers can send
from the buffers. */
reterr = gensio_write(netcon->net, &count, buf->buf + *pos, to_send, NULL);
if (reterr == GE_REMCLOSE) {
shutdown_one_netcon(netcon, "Remote closed");
return -1;
} else if (reterr) {
/* Some other bad error. */
syslog(LOG_ERR, "The network write for port %s had error: %s",
port->name, gensio_err_to_str(reterr));
shutdown_one_netcon(netcon, "network write error");
return -1;
}
*pos += count;
netcon->bytes_sent += count;
if (*pos < buf->cursize)
return 0;
return 1;
}
static void
finish_dev_to_net_write(port_info_t *port)
{
if (any_net_data_to_write(port))
return;
port->dev_to_net.cursize = 0;
port->dev_to_net.pos = 0;
if (port->net_to_dev_state != PORT_CLOSING) {
/* We are done writing on this port, turn the reader back on. */
gensio_set_read_callback_enable(port->io, true);
port->dev_to_net_state = PORT_WAITING_INPUT;
}
}
/* The network fd has room to write some data. This is only activated
if a write fails to complete, it is deactivated as soon as writing
is available again. */
static void
handle_net_fd_write_ready(net_info_t *netcon, struct gensio *net)
{
port_info_t *port = netcon->port;
int rv = 1;
so->lock(port->lock);
if (netcon->banner) {
rv = net_fd_write(port, netcon, netcon->banner, &netcon->banner->pos);
if (rv <= 0)
goto out_unlock;
gbuf_free(netcon->banner);
netcon->banner = NULL;
}
if (port->dev_to_net_state == PORT_WAITING_OUTPUT_CLEAR) {
rv = net_fd_write(port, netcon,
&port->dev_to_net, &netcon->write_pos);
if (rv == 0)
goto out_unlock;
if (netcon->close_on_output_done) {
shutdown_one_netcon(netcon, "port closing");
rv = -1;
}
finish_dev_to_net_write(port);
}
out_unlock:
if (rv != 0)
gensio_set_write_callback_enable(netcon->net, false);
if (rv >= 0)
reset_timer(netcon);
so->unlock(port->lock);
}
enum s2n_ser_ops {
S2N_BAUD = 0,
S2N_DATASIZE,
S2N_PARITY,
S2N_STOPBITS,
S2N_FLOWCONTROL,
S2N_IFLOWCONTROL,
S2N_BREAK,
S2N_DTR,
S2N_RTS
};
static void
sergensio_val_set(struct sergensio *sio, int err,
unsigned int val, void *cb_data)
{
port_info_t *port = sergensio_get_user_data(sio);
enum s2n_ser_ops op = (long) cb_data;
net_info_t *netcon;
so->lock(port->lock);
for_each_connection(port, netcon) {
struct sergensio *rsio;
if (!netcon->net)
continue;
rsio = gensio_to_sergensio(netcon->net);
if (!rsio)
continue;
switch (op) {
case S2N_BAUD:
port->bps = val;
sergensio_baud(rsio, val, NULL, NULL);
break;
case S2N_DATASIZE:
port->bpc = val;
sergensio_datasize(rsio, val, NULL, NULL);
break;
case S2N_PARITY:
if (val == SERGENSIO_PARITY_NONE)
port->paritybits = 0;
else
port->paritybits = 1;
sergensio_parity(rsio, val, NULL, NULL);
break;
case S2N_STOPBITS:
port->stopbits = val;
sergensio_stopbits(rsio, val, NULL, NULL);
break;
case S2N_FLOWCONTROL:
sergensio_flowcontrol(rsio, val, NULL, NULL);
break;
case S2N_IFLOWCONTROL:
sergensio_iflowcontrol(rsio, val, NULL, NULL);
break;
case S2N_BREAK:
sergensio_sbreak(rsio, val, NULL, NULL);
break;
case S2N_DTR:
sergensio_dtr(rsio, val, NULL, NULL);
break;
case S2N_RTS:
sergensio_rts(rsio, val, NULL, NULL);
break;
}
}
so->unlock(port->lock);
}
static void
s2n_modemstate(net_info_t *netcon, struct sergensio *sio,
unsigned int modemstate)
{
port_info_t *port = netcon->port;
if (!sio)
return;
netcon->modemstate_mask = modemstate;
sergensio_modemstate(sio, port->last_modemstate & netcon->modemstate_mask);
}
static void
s2n_linestate(net_info_t *netcon, struct sergensio *sio, unsigned int linestate)
{
port_info_t *port = netcon->port;
if (!sio)
return;
netcon->linestate_mask = linestate;
sergensio_linestate(sio, port->last_linestate & netcon->linestate_mask);
}
static void
s2n_flowcontrol_state(net_info_t *netcon, struct sergensio *sio, bool val)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_flowcontrol_state(rsio, val);
}
static void
s2n_flush(net_info_t *netcon, struct sergensio *sio, int val)
{
struct sergensio *port_rsio = gensio_to_sergensio(netcon->port->io);
struct sergensio *net_rsio = gensio_to_sergensio(netcon->net);
if (port_rsio)
sergensio_flush(port_rsio, val);
if (net_rsio)
sergensio_flush(net_rsio, val);
}
static void
s2n_baud(net_info_t *netcon, struct sergensio *sio, int baud)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_baud(rsio, baud,
sergensio_val_set, (void *) (long) S2N_BAUD);
}
static void
s2n_datasize(net_info_t *netcon, struct sergensio *sio, int datasize)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_datasize(rsio, datasize,
sergensio_val_set, (void *) (long) S2N_DATASIZE);
}
static void
s2n_parity(net_info_t *netcon, struct sergensio *sio, int parity)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_parity(rsio, parity,
sergensio_val_set, (void *) (long) S2N_PARITY);
}
static void
s2n_stopbits(net_info_t *netcon, struct sergensio *sio, int stopbits)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_stopbits(rsio, stopbits,
sergensio_val_set, (void *) (long) S2N_STOPBITS);
}
static void
s2n_flowcontrol(net_info_t *netcon, struct sergensio *sio, int flowcontrol)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_flowcontrol(rsio, flowcontrol,
sergensio_val_set, (void *) (long) S2N_FLOWCONTROL);
}
static void
s2n_iflowcontrol(net_info_t *netcon, struct sergensio *sio, int iflowcontrol)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_iflowcontrol(rsio, iflowcontrol,
sergensio_val_set, (void *) (long) S2N_IFLOWCONTROL);
}
static void
s2n_sbreak(net_info_t *netcon, struct sergensio *sio, int breakv)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_sbreak(rsio, breakv,
sergensio_val_set, (void *) (long) S2N_BREAK);
}
static void
s2n_dtr(net_info_t *netcon, struct sergensio *sio, int dtr)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_dtr(rsio, dtr, sergensio_val_set, (void *) (long) S2N_DTR);
}
static void
s2n_rts(net_info_t *netcon, struct sergensio *sio, int rts)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_rts(rsio, rts, sergensio_val_set, (void *) (long) S2N_RTS);
}
static void
s2n_signature(net_info_t *netcon, struct sergensio *sio, char *sig,
unsigned int sig_len)
{
port_info_t *port = netcon->port;
if (!sio)
return;
sig = port->signaturestr;
if (!sig)
sig = rfc2217_signature;
sig_len = strlen(sig);
sergensio_signature(sio, sig, sig_len, NULL, NULL);
}
static void
s2n_sync(net_info_t *netcon, struct sergensio *sio)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
port_info_t *port = netcon->port;
if (!rsio)
return;
if (port->telnet_brk_on_sync)
sergensio_send_break(rsio);
}
static void
s2n_break(net_info_t *netcon, struct gensio *io)
{
struct sergensio *rsio = gensio_to_sergensio(netcon->port->io);
if (!rsio)
return;
sergensio_send_break(rsio);
}
static int
handle_net_event(struct gensio *net, void *user_data, int event, int err,
unsigned char *buf, gensiods *buflen,
const char *const *auxdata)
{
net_info_t *netcon = user_data;
gensiods len= 0;
if (buflen)
len = *buflen;
switch (event) {
case GENSIO_EVENT_READ:
len = handle_net_fd_read(netcon, net, err, buf, len);
if (buflen)