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/*
Copyright (C) 1996-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils 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 3 of the License, or (at
your option) any later version.
GNU Inetutils 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, see `http://www.gnu.org/licenses/'. */
#include <config.h>
#include <argp.h>
#include <intalkd.h>
#include <signal.h>
#include <libinetutils.h>
#include <progname.h>
#include "attribute.h"
#ifndef LOG_FACILITY
# define LOG_FACILITY LOG_DAEMON
#endif
void talkd_init (void);
void talkd_run (int fd);
/* Configurable parameters: */
int debug;
int logging;
int strict_policy;
unsigned int timeout = 30;
time_t max_idle_time = 120;
time_t max_request_ttl = MAX_LIFE;
char *acl_file;
char *hostname;
const char args_doc[] = "";
const char doc[] = "Talk daemon, using service `ntalk'.";
const char *program_authors[] = {
"Sergey Poznyakoff",
NULL
};
static struct argp_option argp_options[] = {
#define GRP 0
{"acl", 'a', "FILE", 0, "read site-wide ACLs from FILE", GRP + 1},
{"debug", 'd', NULL, 0, "enable debugging", GRP + 1},
{"idle-timeout", 'i', "SECONDS", 0, "set idle timeout value to SECONDS",
GRP + 1},
{"logging", 'l', NULL, 0, "enable more syslog reporting", GRP + 1},
{"request-ttl", 'r', "SECONDS", 0, "set request time-to-live value to "
"SECONDS", GRP + 1},
{"strict-policy", 'S', NULL, 0, "apply strict ACL policy", GRP + 1},
{"timeout", 't', "SECONDS", 0, "set timeout value to SECONDS", GRP + 1},
#undef GRP
{NULL, 0, NULL, 0, NULL, 0}
};
static error_t
parse_opt (int key, char *arg, struct argp_state *state MAYBE_UNUSED)
{
switch (key)
{
case 'a':
acl_file = arg;
break;
case 'd':
debug++;
break;
case 'i':
max_idle_time = strtoul (arg, NULL, 0);
break;
case 'l':
logging++;
break;
case 'r':
max_request_ttl = strtoul (arg, NULL, 0);
break;
case 'S':
strict_policy++;
break;
case 't':
timeout = strtoul (arg, NULL, 0);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static struct argp argp =
{ argp_options, parse_opt, args_doc, doc, NULL, NULL, NULL };
int
main (int argc, char *argv[])
{
set_program_name (argv[0]);
/* Parse command line */
iu_argp_init ("talkd", program_authors);
argp_parse (&argp, argc, argv, 0, NULL, NULL);
openlog ("talkd", LOG_PID, LOG_FACILITY);
read_acl (acl_file, 1); /* System wide ACL. Can abort. */
talkd_init ();
talkd_run (STDIN_FILENO);
return 0;
}
void
talkd_init (void)
{
hostname = localhost ();
if (!hostname)
{
syslog (LOG_ERR, "Cannot determine my hostname: %m");
exit (EXIT_FAILURE);
}
}
time_t last_msg_time;
static void
alarm_handler (int err MAYBE_UNUSED)
{
int oerrno = errno;
if ((time (NULL) - last_msg_time) >= max_idle_time)
exit (EXIT_SUCCESS);
alarm (timeout);
errno = oerrno;
}
void
talkd_run (int fd)
{
struct sockaddr ctl_addr;
signal (SIGALRM, alarm_handler);
alarm (timeout);
while (1)
{
int rc;
struct sockaddr_in sa_in;
CTL_MSG msg;
CTL_RESPONSE resp;
socklen_t len;
len = sizeof sa_in;
rc =
recvfrom (fd, &msg, sizeof msg, 0, (struct sockaddr *) &sa_in, &len);
if (rc != sizeof msg)
{
if (rc < 0 && errno != EINTR && (logging || debug))
syslog (LOG_NOTICE, "recvfrom: %m");
continue;
}
last_msg_time = time (NULL);
if (process_request (&msg, &sa_in, &resp) == 0)
{
ctl_addr.sa_family = msg.ctl_addr.sa_family;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
ctl_addr.sa_len = sizeof (struct sockaddr_in);
#endif
memcpy (&ctl_addr.sa_data, &msg.ctl_addr.sa_data,
sizeof (ctl_addr.sa_data));
rc = sendto (fd, &resp, sizeof resp, 0,
&ctl_addr, sizeof (ctl_addr));
if (rc != sizeof resp && (logging || debug))
syslog (LOG_NOTICE, "sendto: %m");
}
}
}
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