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