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port.c
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/*
* ser2net - A program for allowing telnet connection to serial ports
* Copyright (C) 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.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <syslog.h>
#include <assert.h>
#include "ser2net.h"
#include "port.h"
#include "gbuf.h"
#ifdef DO_MDNS
#include <gensio/gensio_mdns.h>
#endif
#include <gensio/argvutils.h>
#include <gensio/gensio_err.h>
#include <gensio/sergensio.h>
struct gensio_lock *ports_lock;
port_info_t *ports = NULL; /* Linked list of ports. */
port_info_t *new_ports = NULL; /* New ports during config/reconfig. */
port_info_t *new_ports_end = NULL;
net_info_t *
first_live_net_con(port_info_t *port)
{
net_info_t *netcon;
for_each_connection(port, netcon) {
if (netcon->net)
return netcon;
}
return NULL;
}
bool
port_in_use(port_info_t *port)
{
return (port->net_to_dev_state != PORT_UNCONNECTED &&
port->net_to_dev_state != PORT_CLOSED);
}
/* Checks to see if some other port has the same device in use. Must
be called with ports_lock held. */
int
is_device_already_inuse(port_info_t *check_port)
{
port_info_t *port = ports;
while (port != NULL) {
if (port != check_port) {
if ((strcmp(port->devname, check_port->devname) == 0)
&& port_in_use(port)) {
return 1;
}
}
port = port->next;
}
return 0;
}
int
num_connected_net(port_info_t *port)
{
net_info_t *netcon;
int count = 0;
for_each_connection(port, netcon) {
if (netcon->net)
count++;
}
return count;
}
gensiods
net_raddr(struct gensio *io, struct sockaddr_storage *addr, gensiods *socklen)
{
*socklen = sizeof(*addr);
#if (defined(gensio_version_major) && (gensio_version_major > 2 || \
(gensio_version_major == 2 && gensio_version_minor > 0)))
return gensio_control(io, GENSIO_CONTROL_DEPTH_FIRST, true,
GENSIO_CONTROL_RADDR_BIN,
(char *) addr, socklen);
#else
return gensio_get_raddr(io, (char *) addr, socklen);
#endif
}
void
reset_timer(net_info_t *netcon)
{
netcon->timeout_left = netcon->port->timeout;
}
void
port_start_timer(port_info_t *port)
{
gensio_time timeout;
unsigned int timeout_sec;
switch (port->dev_to_net_state) {
case PORT_UNCONNECTED:
timeout_sec = port->connector_retry_time;
break;
case PORT_CLOSED:
case PORT_NOT_STARTED:
timeout_sec = port->accepter_retry_time;
break;
default:
timeout_sec = 1;
break;
}
#ifdef gensio_version_major
timeout.secs = timeout_sec;
timeout.nsecs = 0;
#else
timeout.tv_sec = timeout_sec;
timeout.tv_usec = 0;
#endif
so->start_timer(port->timer, &timeout);
}
static void
kick_old_user(port_info_t *port, net_info_t *netcon, struct gensio *new_net)
{
char *err = "kicked off, new user is coming\r\n";
/* If another user is waiting for a kick, kick that user. */
if (netcon->new_net) {
gensio_write(netcon->new_net, NULL, err, strlen(err), NULL);
gensio_free(netcon->new_net);
}
/* Wait it to be unconnected and clean, restart the process. */
netcon->new_net = new_net;
shutdown_one_netcon(netcon, err);
}
static void
check_port_new_net(port_info_t *port, net_info_t *netcon)
{
struct gensio *net;
if (!netcon->new_net)
return;
if (netcon->net) {
/* Something snuck in before, kick this one out. */
char *err = "kicked off, new user is coming\r\n";
gensio_write(netcon->new_net, NULL, err, strlen(err), NULL);
gensio_free(netcon->new_net);
netcon->new_net = NULL;
return;
}
net = netcon->new_net;
netcon->new_net = NULL;
handle_new_net(port, net, netcon);
}
static int
port_new_con(port_info_t *port, struct gensio *net)
{
const char *err = NULL;
unsigned int i, j;
struct sockaddr_storage addr;
gensiods socklen;
so->lock(ports_lock); /* For is_device_already_inuse() */
so->lock(port->lock);
if (port->net_to_dev_state == PORT_CLOSING) {
/* Can happen on a race with the callback disable. */
if (!port->enabled) {
err = "Port closing\r\n";
goto out_err;
}
/* We hold off new connections during a close */
goto out;
}
if (!port->enabled) {
err = "Port disabled\r\n";
goto out_err;
}
if (!net_raddr(net, &addr, &socklen)) {
if (!remaddr_check(port->remaddrs,
(struct sockaddr *) &addr, socklen)) {
err = "Accessed denied due to your net address\r\n";
goto out_err;
}
}
for (j = port->max_connections, i = 0; i < port->max_connections; i++) {
if (!port->netcons[i].net && !port->netcons[i].remote_fixed)
break;
if (!port->netcons[i].remote_fixed)
j = i;
}
if (i == port->max_connections) {
if (port->kickolduser_mode && j < port->max_connections) {
/* Kick off the first non-fixed user. */
kick_old_user(port, &port->netcons[j], net);
goto out;
}
err = "Port already in use\r\n";
}
if (!err && is_device_already_inuse(port))
err = "Port's device already in use\r\n";
if (port->connbacks && !port->io_open)
err = "Port's device failed open\r\n";
if (err) {
out_err:
so->unlock(port->lock);
so->unlock(ports_lock);
gensio_write(net, NULL, err, strlen(err), NULL);
gensio_free(net);
return 0;
}
/* We have to hold the ports_lock until after this call so the
device won't get used (from is_device_already_inuse()). */
handle_new_net(port, net, &(port->netcons[i]));
out:
so->unlock(port->lock);
so->unlock(ports_lock);
return 0;
}
/* A connection request has come in on a port. */
static int
handle_port_child_event(struct gensio_accepter *accepter, void *user_data,
int event, void *data)
{
port_info_t *port = user_data;
if (event == GENSIO_ACC_EVENT_LOG) {
do_gensio_log(port->name, data);
return 0;
}
switch (event) {
case GENSIO_ACC_EVENT_NEW_CONNECTION:
return port_new_con(port, data);
#ifdef GENSIO_ACC_EVENT_PARMLOG
case GENSIO_ACC_EVENT_PARMLOG: {
struct gensio_parmlog_data *d = (struct gensio_parmlog_data *) data;
vsyslog(LOG_ERR, d->log, d->args);
return 0;
}
#endif
default:
return handle_acc_auth_event(port->authdir, port->pamauth,
port->allowed_users, event, data);
}
}
#ifdef DO_MDNS
static struct gensio_mdns *mdns;
static char *
derive_mdns_type(port_info_t *port)
{
/* Get a mdns type based on the gensio. */
unsigned int i;
const char *type, *ntype = "_iostream._tcp";
type = gensio_acc_get_type(port->accepter, 0);
for (i = 1; type; i++) {
if (strcmp(type, "tcp") == 0)
break;
if (strcmp(type, "udp") == 0) {
ntype = "_iostream._udp";
break;
}
type = gensio_acc_get_type(port->accepter, i);
}
return strdup(ntype);
}
static void
mdns_addprovider(struct absout *eout, port_info_t *port)
{
gensiods i;
static char *provstr = "provider=";
char *tmps = NULL;
for (i = 0; i < port->mdns_txt_argc; i++) {
if (strncmp(port->mdns_txt[i], provstr, strlen(provstr)) == 0)
/* User already specified it, don't override. */
return;
}
tmps = gensio_alloc_sprintf(so, "%s%s", provstr, "ser2net");
if (!tmps)
goto out_nomem;
if (gensio_argv_append(so, &port->mdns_txt, tmps,
&port->mdns_txt_args, &port->mdns_txt_argc,
false))
goto out_nomem;
return;
out_nomem:
eout->out(eout, "Error allocation mdns provider for %s: out of memory",
port->name);
if (tmps)
so->free(so, tmps);
}
static void
mdns_addstack(struct absout *eout, port_info_t *port)
{
gensiods i;
static char *stackstr = "gensiostack=";
const char *type;
char *stack = NULL, *tmps = NULL;
for (i = 0; i < port->mdns_txt_argc; i++) {
if (strncmp(port->mdns_txt[i], stackstr, strlen(stackstr)) == 0)
/* User already specified it, don't override. */
return;
}
for (i = 0; ; i++) {
type = gensio_acc_get_type(port->accepter, i);
if (!type)
break;
if (strcmp(type, "telnet") == 0) {
struct gensio_accepter *telnet_acc =
gensio_acc_get_child(port->accepter, i);
const char *rfc2217 = "";
if (gensio_acc_to_sergensio_acc(telnet_acc))
rfc2217 = "(rfc2217)";
tmps = gensio_alloc_sprintf(so, "%s%s%s%s",
stack ? stack : "", stack ? "," : "",
type, rfc2217);
} else {
tmps = gensio_alloc_sprintf(so, "%s%s%s",
stack ? stack : "", stack ? "," : "",
type);
}
if (!tmps)
goto out_nomem;
if (stack)
so->free(so, stack);
stack = tmps;
}
if (!stack)
return;
tmps = gensio_alloc_sprintf(so, "%s%s", stackstr, stack);
if (!tmps)
goto out_nomem;
stack = tmps;
if (gensio_argv_append(so, &port->mdns_txt, stack,
&port->mdns_txt_args, &port->mdns_txt_argc,
false))
goto out_nomem;
return;
out_nomem:
eout->out(eout, "Error allocation mdns stack for %s: out of memory",
port->name);
if (stack)
so->free(so, stack);
}
static void
mdns_setup(struct absout *eout, port_info_t *port)
{
int err;
char portnum_str[20];
gensiods portnum_len = sizeof(portnum_str);
if (!port->mdns)
return;
if (!mdns) {
eout->out(eout, "mdns requested for device %s, but mdns failed"
" to start or is disabled in gensio\n", port->name);
return;
}
if (!port->mdns_port) {
strcpy(portnum_str, "0");
err = gensio_acc_control(port->accepter, GENSIO_CONTROL_DEPTH_FIRST,
true, GENSIO_ACC_CONTROL_LPORT, portnum_str,
&portnum_len);
if (err) {
eout->out(eout, "Can't get mdns port for device %s: %s",
port->name, gensio_err_to_str(err));
return;
}
port->mdns_port = strtoul(portnum_str, NULL, 0);
}
if (!port->mdns_type) {
port->mdns_type = derive_mdns_type(port);
if (!port->mdns_type) {
eout->out(eout, "Can't alloc mdns type for %s: out of memory",
port->name);
return;
}
}
if (!port->mdns_name) {
port->mdns_name = strdup(port->name);
if (!port->mdns_name) {
eout->out(eout, "Can't alloc mdns name for %s: out of memory",
port->name);
return;
}
}
mdns_addprovider(eout, port);
mdns_addstack(eout, port);
/*
* Always stick on the NULL, that doesn't update argc so it's safe,
* a new txt will just write over the NULL we added.
*/
err = gensio_argv_append(so, &port->mdns_txt, NULL,
&port->mdns_txt_args, &port->mdns_txt_argc, true);
if (err) {
eout->out(eout, "Error terminating mdns-txt for %s: %s",
port->name, gensio_err_to_str(err));
return;
}
if (port->do_mdns_sysattrs)
add_sys_attrs(eout, port->name, port->devname, &port->mdns_txt,
&port->mdns_txt_args, &port->mdns_txt_argc);
err = gensio_mdns_add_service(mdns, port->mdns_interface,
port->mdns_nettype,
port->mdns_name, port->mdns_type,
port->mdns_domain, port->mdns_host,
port->mdns_port, port->mdns_txt,
&port->mdns_service);
if (err)
eout->out(eout, "Can't add mdns service for device %s: %s",
port->name, gensio_err_to_str(err));
}
static void
mdns_shutdown(port_info_t *port)
{
if (port->mdns_service)
gensio_mdns_remove_service(port->mdns_service);
port->mdns_service = NULL;
}
#else
static void
mdns_setup(struct absout *eout, port_info_t *port)
{
}
static void
mdns_shutdown(port_info_t *port)
{
}
#endif /* DO_MDNS */
int
startup_port(struct absout *eout, port_info_t *port)
{
int err;
if (port->dev_to_net_state == PORT_NOT_STARTED) {
port_start_timer(port);
return GE_NOTREADY;
}
if (port->dev_to_net_state != PORT_CLOSED)
return GE_INUSE;
err = gensio_acc_startup(port->accepter);
if (err) {
eout->out(eout, "Unable to startup network port %s: %s",
port->name, gensio_err_to_str(err));
/* Retry in a bit. */
port_start_timer(port);
return err;
}
port->dev_to_net_state = PORT_UNCONNECTED;
port->net_to_dev_state = PORT_UNCONNECTED;
mdns_setup(eout, port);
if (port->connbacks) {
err = port_dev_enable(port);
if (err) {
eout->out(eout, "Unable to enable port device %s: %s",
port->name, gensio_err_to_str(err));
shutdown_port(port, "Error enabling port connector");
err = 0; /* Don't report an error here, let the shutdown run. */
}
}
return err;
}
static void
call_port_op_done(port_info_t *port)
{
void (*port_op_done)(struct port_info *, void *) = port->port_op_done;
if (port_op_done) {
port->port_op_done = NULL;
port_op_done(port, port->port_op_data);
}
}
static void
finish_shutdown_port(struct gensio_runner *runner, void *cb_data)
{
port_info_t *port = cb_data;
so->lock(ports_lock);
so->lock(port->lock);
if (port->enabled) {
port->net_to_dev_state = PORT_UNCONNECTED;
port->dev_to_net_state = PORT_UNCONNECTED;
if (port->connbacks)
port_start_timer(port);
} else {
port->net_to_dev_state = PORT_CLOSED;
port->dev_to_net_state = PORT_CLOSED;
}
gbuf_reset(&port->net_to_dev);
if (port->devstr) {
gbuf_free(port->devstr);
port->devstr = NULL;
}
gbuf_reset(&port->dev_to_net);
port->dev_bytes_received = 0;
port->dev_bytes_sent = 0;
if (gensio_acc_exit_on_close(port->accepter))
/* This was a zero port (for stdin/stdout), this is only
allowed with one port at a time, and we shut down when it
closes. */
exit(0);
/* If the port has been deleted, then finish the job. */
if (port->deleted) {
port_info_t *curr, *prev, *new;
new = port->new_config;
port->new_config = NULL;
prev = NULL;
for (curr = ports; curr && curr != port; curr = curr->next)
prev = curr;
if (curr) {
if (prev == NULL)
ports = curr->next;
else
prev->next = curr->next;
}
so->unlock(port->lock);
free_port(port);
/* Start the replacement port if it was set. */
if (new) {
so->lock(new->lock);
if (prev) {
new->next = prev->next;
prev->next = new;
} else {
new->next = ports;
ports = new;
}
if (new->enabled)
startup_port(&syslog_absout, new);
so->unlock(new->lock);
}
so->unlock(ports_lock);
return; /* We have to return here because we no longer have a port. */
} else if (port->enabled) {
net_info_t *netcon;
gensio_acc_set_accept_callback_enable(port->accepter, true);
for_each_connection(port, netcon)
check_port_new_net(port, netcon);
} else {
/* Port was disabled, shut it down. */
mdns_shutdown(port);
gensio_acc_shutdown(port->accepter, NULL, NULL);
call_port_op_done(port);
}
so->unlock(port->lock);
so->unlock(ports_lock);
}
static void
io_shutdown_done(struct gensio *io, void *cb_data)
{
port_info_t *port = cb_data;
port->io_open = false;
so->run(port->runshutdown);
}
void
shutdown_port_io(port_info_t *port)
{
int err = 1;
shutdown_trace(port);
if (port->io)
err = gensio_close(port->io, io_shutdown_done, port);
if (err) {
port->io_open = false;
so->run(port->runshutdown);
}
}
static void
timer_shutdown_done(struct gensio_timer *timer, void *cb_data)
{
port_info_t *port = cb_data;
so->lock(port->lock);
gensio_set_write_callback_enable(port->io, false);
shutdown_port_io(port);
so->unlock(port->lock);
}
/* Output any pending data and the devstr buffer. */
static void
handle_dev_fd_close_write(port_info_t *port)
{
int err;
if (gbuf_cursize(&port->net_to_dev) != 0)
err = gbuf_write(port, &port->net_to_dev);
else if (port->devstr)
err = gbuf_write(port, port->devstr);
else
goto closeit;
if (err) {
syslog(LOG_ERR, "The dev write(3) for port %s had error: %s",
port->name, gensio_err_to_str(err));
goto closeit;
}
if (gbuf_cursize(&port->net_to_dev) ||
(port->devstr && gbuf_cursize(port->devstr)))
return;
closeit:
if (port->shutdown_timeout_count) {
gensio_set_write_callback_enable(port->io, false);
err = so->stop_timer_with_done(port->timer, timer_shutdown_done, port);
if (err == GE_TIMEDOUT) {
port->shutdown_timeout_count = 0;
shutdown_port_io(port);
}
}
}
static void
start_shutdown_port_io(port_info_t *port)
{
if (!port->io_open) {
so->run(port->runshutdown);
return;
}
if (port->devstr)
gbuf_free(port->devstr);
port->devstr = process_str_to_buf(port, NULL, port->closestr);
port->dev_write_handler = handle_dev_fd_close_write;
gensio_set_write_callback_enable(port->io, true);
}
static void
netcon_finish_shutdown(net_info_t *netcon)
{
port_info_t *port = netcon->port;
if (netcon->net) {
report_disconnect(port, netcon);
gensio_free(netcon->net);
netcon->net = NULL;
}
netcon->closing = false;
netcon->bytes_received = 0;
netcon->bytes_sent = 0;
netcon->write_pos = 0;
if (netcon->banner) {
gbuf_free(netcon->banner);
netcon->banner = NULL;
}
if (num_connected_net(port) == 0) {
if (port->net_to_dev_state == PORT_CLOSING) {
start_shutdown_port_io(port);
} else if (port->connbacks && port->enabled) {
/* Leave the device open for connect backs. */
gensio_set_write_callback_enable(port->io, true);
port->dev_to_net_state = PORT_WAITING_INPUT;
port->net_to_dev_state = PORT_UNCONNECTED;
check_port_new_net(port, netcon);
} else {
shutdown_port(port, NULL);
}
} else {
check_port_new_net(port, netcon);
}
}
static void
handle_net_fd_closed(struct gensio *net, void *cb_data)
{
net_info_t *netcon = cb_data;
port_info_t *port = netcon->port;
so->lock(port->lock);
netcon_finish_shutdown(netcon);
so->unlock(port->lock);
}
void
shutdown_one_netcon(net_info_t *netcon, const char *reason)
{
int err;
if (netcon->closing)
return;
netcon->write_pos = 0;
footer_trace(netcon->port, "netcon", reason);
netcon->close_on_output_done = false;
netcon->closing = true;
err = gensio_close(netcon->net, handle_net_fd_closed, netcon);
if (err)
netcon_finish_shutdown(netcon);
}
static bool
shutdown_all_netcons(port_info_t *port, bool close_on_output_only)
{
net_info_t *netcon;
bool some_to_close = false;
for_each_connection(port, netcon) {
if (netcon->net) {
if (close_on_output_only && !netcon->close_on_output_done)
continue;
some_to_close = true;
netcon->write_pos = port->dev_to_net.cursize;
shutdown_one_netcon(netcon, "port closing");
}
}
return some_to_close;
}
static void
accept_read_disabled(struct gensio_accepter *acc, void *cb_data)
{
port_info_t *port = cb_data;
net_info_t *netcon;
bool some_to_close = false;
so->lock(port->lock);
port->shutdown_started = false;
/*
* At this point we won't receive any more accepts until we re-enable it,
* go into closing state unless it wasn't an error and a new net came in.
*/
if (port->net_to_dev_state != PORT_CLOSING &&
num_connected_net(port) > 0) {
/*
* It wasn't an error close and a new connection came in. Just
* ignore the shutdown.
*/
gensio_acc_set_accept_callback_enable(port->accepter, true);
for_each_connection(port, netcon) {
if (netcon->net)
gensio_set_read_callback_enable(netcon->net, true);
}
gensio_set_read_callback_enable(port->io, true);
goto out_unlock;
}
/* After this point we will shut down the port completely. */
/* FIXME - this should be calculated somehow, not a raw number .*/
port->shutdown_timeout_count = 4;
footer_trace(port, "port", port->shutdown_reason);
for_each_connection(port, netcon) {
if (netcon->net) {
some_to_close = true;
if (netcon->new_net) {
/* Something is waiting for a kick. */
char *err = "port is shutting down\r\n";
gensio_write(netcon->new_net, NULL, err, strlen(err), NULL);
gensio_free(netcon->new_net);
netcon->new_net = NULL;
}
if (port->dev_to_net_state == PORT_WAITING_OUTPUT_CLEAR &&
netcon->write_pos < port->dev_to_net.cursize)
/* Net has data to send, wait until it's done. */
netcon->close_on_output_done = true;
else
shutdown_one_netcon(netcon, "port closing");
}
}
port->dev_to_net_state = PORT_CLOSING;
port->net_to_dev_state = PORT_CLOSING;
if (!some_to_close)
start_shutdown_port_io(port);
out_unlock:
so->unlock(port->lock);
}
int
shutdown_port(port_info_t *port, const char *errreason)
{
net_info_t *netcon;
int err;
if (port->shutdown_started && port->net_to_dev_state != PORT_CLOSING
&& errreason) {
/* An error occurred and we are in a non-err shutdown. Convert it. */
port->shutdown_reason = errreason;
port->net_to_dev_state = PORT_CLOSING;
gensio_set_read_callback_enable(port->io, false);
return 0;
}
if (port->net_to_dev_state == PORT_CLOSING ||
port->net_to_dev_state == PORT_CLOSED ||
(port->enabled && port->dev_to_net_state == PORT_UNCONNECTED) ||
port->shutdown_started)
return GE_INUSE;
if (errreason) {
/* It's an error, force a shutdown. Don't set dev_to_net_state yet. */
port->shutdown_reason = errreason;
port->net_to_dev_state = PORT_CLOSING;
/* Shut down write on an error. */
gensio_set_read_callback_enable(port->io, false);
} else {
port->shutdown_reason = "All users disconnected";
}
port->shutdown_started = true;
err = gensio_acc_set_accept_callback_enable_cb(port->accepter, false,
accept_read_disabled, port);
/* This is bad, it's an out of memory condition. Abort. */
assert(err == 0);
for_each_connection(port, netcon) {
if (netcon->net)
gensio_set_read_callback_enable(netcon->net, false);
}
gensio_set_read_callback_enable(port->io, false);
return 0;
}
static bool
handle_shutdown_timeout(port_info_t *port)
{
/* Something wasn't able to do any writes and locked up the shutdown. */
/* Check the network connections first. */
if (shutdown_all_netcons(port, true))
return true;
shutdown_port_io(port);
return false;
}
static int
port_startup(port_info_t *new_port, struct absout *eout, bool retry)
{
int err;
err = str_to_gensio(new_port->devname, so, handle_dev_event, new_port,
&new_port->io);
if (err) {
if (!retry || new_port->retry_startup_counter % 64 == 0)
eout->out(eout, "device configuration %s invalid: %s",
new_port->devname, gensio_err_to_str(err));
goto out_err;
}
err = str_to_gensio_accepter(new_port->accstr, so,
handle_port_child_event, new_port,
&new_port->accepter);
if (err) {
gensio_free(new_port->io);
new_port->io = NULL;
if (!retry || new_port->retry_startup_counter % 64 == 0)
eout->out(eout, "Invalid accepter port name/number '%s': %s",
new_port->accstr, gensio_err_to_str(err));
goto out_err;
}
if (new_port->enabled && new_port->do_telnet) {
const char *str = "telnet";
struct gensio_accepter *parent;
if (new_port->allow_2217)
str = "telnet(rfc2217=true)";
err = str_to_gensio_accepter_child(new_port->accepter, str,
so,
handle_port_child_event,
new_port, &parent);
if (err) {
gensio_free(new_port->io);
new_port->io = NULL;
gensio_acc_free(new_port->accepter);
new_port->accepter = NULL;
if (!retry || new_port->retry_startup_counter % 64 == 0)
eout->out(eout, "Could not allocate telnet gensio: %s",
gensio_err_to_str(err));
goto out_err;
}
new_port->accepter = parent;
}
new_port->dev_to_net_state = PORT_CLOSED;
if (retry)
eout->out(eout, "port accepter '%s' is now started",
new_port->accstr);
return 0;
out_err:
new_port->retry_startup_counter++;
return err;