mdw@git.distorted.org.uk Git - tripe/blob - server/tripe.c

   1 /* -*-c-*-
   2  *
   3  * Main program
   4  *
   5  * (c) 2001 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Trivial IP Encryption (TrIPE).
  11  *
  12  * TrIPE is free software: you can redistribute it and/or modify it under
  13  * the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * TrIPE is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with TrIPE.  If not, see <https://www.gnu.org/licenses/>.
  24  */
  25
  26 /*----- Header files ------------------------------------------------------*/
  27
  28 #include "tripe.h"
  29
  30 /*----- Global variables --------------------------------------------------*/
  31
  32 sel_state sel;
  33
  34 /*----- Static variables --------------------------------------------------*/
  35
  36 static sel_timer it;
  37 #define T_INTERVAL MIN(1)
  38
  39 static unsigned iv_nreasons = 0;
  40 static struct timeval iv_next = { 0, 0 };
  41 static int lpdone = 0;
  42
  43 /*----- The interval timer ------------------------------------------------*/
  44
  45 /* --- @interval@ --- *
  46  *
  47  * Arguments:   @struct timeval *tv@ = time when called
  48  *              @void *v@ = boring pointer
  49  *
  50  * Returns:     ---
  51  *
  52  * Use:         Called periodically to do housekeeping tasks.
  53  */
  54
  55 static void interval(struct timeval *tv, void *v)
  56 {
  57   T( trace(T_PEER, "peer: interval timer"); )
  58   iv_next = *tv;
  59   rand_seed(RAND_GLOBAL, MAXHASHSZ);
  60   p_interval();
  61   iv_next.tv_sec += T_INTERVAL;
  62   sel_addtimer(&sel, &it, &iv_next, interval, v);
  63 }
  64
  65 /* --- @iv_addreason@ --- *
  66  *
  67  * Arguments:   ---
  68  *
  69  * Returns:     ---
  70  *
  71  * Use:         Adds an `interval timer reason'; if there are no others, the
  72  *              interval timer is engaged.
  73  */
  74
  75 void iv_addreason(void)
  76 {
  77   struct timeval tv;
  78
  79   if (!iv_nreasons) {
  80     gettimeofday(&tv, 0);
  81     if (TV_CMP(&tv, >=, &iv_next)) interval(&tv, 0);
  82     else sel_addtimer(&sel, &it, &iv_next, interval, 0);
  83   }
  84   iv_nreasons++;
  85 }
  86
  87 /* --- @iv_rmreason@ --- *
  88  *
  89  * Arguments:   ---
  90  *
  91  * Returns:     ---
  92  *
  93  * Use:         Removes an interval timer reason; if there are none left, the
  94  *              interval timer is disengaged.
  95  */
  96
  97 void iv_rmreason(void)
  98 {
  99   assert(iv_nreasons); iv_nreasons--;
 100   if (!iv_nreasons) sel_rmtimer(&it);
 101 }
 102
 103 /*----- The main loop -----------------------------------------------------*/
 104
 105 /* --- @lp_init@ --- *
 106  *
 107  * Arguments:   ---
 108  *
 109  * Returns:     ---
 110  *
 111  * Use:         Initializes the main loop.  Most importantly, this sets up
 112  *              the select multiplexor that everything else hooks onto.
 113  */
 114
 115 void lp_init(void)
 116 {
 117   gettimeofday(&iv_next, 0); iv_next.tv_sec += T_INTERVAL;
 118   signal(SIGPIPE, SIG_IGN);
 119   sel_init(&sel);
 120   sig_init(&sel);
 121 }
 122
 123 /* --- @lp_end@ --- *
 124  *
 125  * Arguments:   ---
 126  *
 127  * Returns:     ---
 128  *
 129  * Use:         Requests an exit from the main loop.
 130  */
 131
 132 void lp_end(void) { lpdone = 1; }
 133
 134 /* --- @lp_run@ --- *
 135  *
 136  * Arguments:   ---
 137  *
 138  * Returns:     Zero on successful termination; @-1@ if things went wrong.
 139  *
 140  * Use:         Cranks the main loop until it should be cranked no more.
 141  */
 142
 143 int lp_run(void)
 144 {
 145   int nerr = 0;
 146
 147   for (;;) {
 148     a_preselect();
 149     if (lpdone) break;
 150     if (!sel_select(&sel)) nerr = 0;
 151     else if (errno != EINTR && errno != EAGAIN) {
 152       a_warn("SERVER", "select-error", "?ERRNO", A_END);
 153       nerr++;
 154       if (nerr > 8) {
 155         a_warn("ABORT", "repeated-select-errors", A_END);
 156         abort();
 157       }
 158     }
 159   }
 160   lpdone = 0;
 161   return (0);
 162 }
 163
 164 /*----- That's all, folks -------------------------------------------------*/