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      1 /*
      2  * minconn.c - pppd plugin to implement a `minconnect' option.
      3  *
      4  * Copyright (c) 1999-2024 Paul Mackerras. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  *
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  *
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in
     15  *    the documentation and/or other materials provided with the
     16  *    distribution.
     17  *
     18  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
     19  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
     20  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
     21  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     22  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
     23  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
     24  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     25  */
     26 
     27 #include <stddef.h>
     28 #include <time.h>
     29 #include <stdint.h>
     30 #include <stdbool.h>
     31 #include <stdarg.h>
     32 #include <sys/types.h>
     33 
     34 #include <pppd/pppd.h>
     35 #include <pppd/options.h>
     36 
     37 #if !defined(SOL2)
     38 #include <linux/ppp_defs.h>
     39 #else
     40 #include <net/ppp_defs.h>
     41 #endif
     42 
     43 char pppd_version[] = PPPD_VERSION;
     44 
     45 static int minconnect = 0;
     46 
     47 static struct option my_options[] = {
     48 	{ "minconnect", o_int, &minconnect,
     49 	  "Set minimum connect time before idle timeout applies" },
     50 	{ NULL }
     51 };
     52 
     53 static int my_get_idle(struct ppp_idle *idle)
     54 {
     55 	time_t t;
     56 
     57 	if (idle == NULL)
     58 		return minconnect ? minconnect: ppp_get_max_idle_time();
     59 	t = idle->xmit_idle;
     60 	if (idle->recv_idle < t)
     61 		t = idle->recv_idle;
     62 	return ppp_get_max_idle_time() - t;
     63 }
     64 
     65 void plugin_init(void)
     66 {
     67 	info("plugin_init");
     68 	ppp_add_options(my_options);
     69 	idle_time_hook = my_get_idle;
     70 }
     71