| 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 -------------------------------------------------*/ |