src/server/daemon/event.c

Fri, 20 Sep 2024 20:04:35 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 20 Sep 2024 20:04:35 +0200
changeset 560
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parent 556
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permissions
-rw-r--r--

fix trace log use after free

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <cx/hash_map.h>
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30 #include <cx/linked_list.h>
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31 #include "../util/atomic.h"
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33 #include "event.h"
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35 static CxMap *event_handler_map = NULL;
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36 int numevhandlers = 0;
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37
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38 EVHandler *default_event_handler = NULL;
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39
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40 EVHandler *last_handler_c = NULL;
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41
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42 int create_event_handler(EventHandlerConfig *cfg) {
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43 if(event_handler_map == NULL) {
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44 event_handler_map = cxHashMapCreate(cxDefaultAllocator, CX_STORE_POINTERS, 16);
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45 }
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46
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47 CxHashKey key = cx_hash_key_bytes((const unsigned char*)cfg->name.ptr, cfg->name.length);
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48
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49 // if the event handler already exists, we don't modify it
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50 if(cxMapGet(event_handler_map, key)) {
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51 /* TODO: log message */
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52 /* TODO: set reload status */
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53 log_ereport(LOG_DEBUG, "event handler %s already exists", cfg->name.ptr);
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54 return 0;
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55 }
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56
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57 // create new handler
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58 EVHandler *e = evhandler_create(cfg);
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59 if(e == NULL) {
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60 log_ereport(LOG_FAILURE, "evhandler_create failed");
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61 return 1;
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62 }
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63
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64 if(cfg->isdefault) {
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65 if(default_event_handler) {
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66 /* there can be only one default event handler */
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67 /* TODO: log warning */
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68 }
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69 default_event_handler = e;
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70 }
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71
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72 int ret = cxMapPut(event_handler_map, key, e);
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73 if(ret == 0) {
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74 last_handler_c = e;
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75 numevhandlers++;
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76 }
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77
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78 return ret;
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79 }
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80
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81 void shutdown_eventhandlers_wait(void) {
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82 log_ereport(LOG_INFORM, "shutdown eventhandlers");
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83
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84 CxIterator i = cxMapIteratorValues(event_handler_map);
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85 cx_foreach(EVHandler *, e, i) {
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86 evhandler_shutdown(e);
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87 }
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88
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89 i = cxMapIteratorValues(event_handler_map);
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90 cx_foreach(EVHandler *, e, i) {
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91 evhandler_wait_and_destroy(e);
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92 }
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93
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94 cxMapDestroy(event_handler_map);
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95
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96 log_ereport(LOG_INFORM, "all eventhandlers closed");
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97 }
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98
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99 void evhandler_shutdown(EVHandler *h) {
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100 for(int i=0;i<h->numins;i++) {
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101 ev_instance_shutdown(h->instances[i]);
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102 }
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103 }
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104
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105 void evhandler_close(EVHandler *h) {
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106 for(int i=0;i<h->numins;i++) {
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107 ev_instance_close(h->instances[i]);
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108 }
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109 }
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110
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111 void evhandler_wait_and_destroy(EVHandler *h) {
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112 for(int i=0;i<h->numins;i++) {
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113 ev_instance_wait(h->instances[i]);
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114 }
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115
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116 free(h->instances);
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117 free(h);
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118 }
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119
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120 /*
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121 * checks if there is at least one event handler and a default handler
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122 * if necessary, check_event_handler_cfg() creates a default event handler
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123 */
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124 int check_event_handler_cfg() {
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125 if(numevhandlers > 0 ) {
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126 if(default_event_handler) {
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127 return 0;
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128 } else {
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129 default_event_handler = last_handler_c;
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130 return 0;
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131 }
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132 }
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133
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134 EventHandlerConfig cfg;
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135 cfg.name = cx_str("default");
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136 cfg.nthreads = 1;
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137 cfg.isdefault = 1;
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138
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139 return create_event_handler(&cfg);
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140 }
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141
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142
159
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143 EVHandler* get_default_event_handler() {
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144 return default_event_handler;
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145 }
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146
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147 EVHandler* get_event_handler(const char *name) {
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148 return cxMapGet(event_handler_map, cx_hash_key_str(name));
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149 }
159
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150
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151 EventHandler* ev_instance(EVHandler *ev) {
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152 int nev = ev->numins;
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153 if(nev == 1) {
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154 return ev->instances[0];
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155 }
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156
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157 int ins = ev->current & nev;
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158 ws_atomic_inc32(&ev->current);
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159 return ev->instances[ins];
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160 }
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161
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162 int ev_free_event(EventHandler *h, Event *event) {
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163 free(event);
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164 return 0;
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165 }
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166
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167
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168 void ev_watchlist_add(EventHandler *h, EVWatchList *elm) {
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169 watchlist_add(&h->watchlist_begin, &h->watchlist_end, elm);
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170 }
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171
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172 void ev_watchlist_remove(EventHandler *h, EVWatchList *elm) {
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173 watchlist_remove(&h->watchlist_begin, &h->watchlist_end, elm);
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174 }
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175
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176 void ev_saf_return(EventHandler *h, Session *sn, Request *rq, int ret) {
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177 h->fnreturn[h->numret++] = (EVReturn){ sn, rq, ret };
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178 }
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179
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180 void watchlist_add(EVWatchList **begin, EVWatchList **end, EVWatchList *elm) {
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181 cx_linked_list_add(
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182 (void**)begin,
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183 (void**)end,
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184 offsetof(EVWatchList, prev),
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185 offsetof(EVWatchList, next),
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186 elm);
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187 }
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188
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189 void watchlist_remove(EVWatchList **begin, EVWatchList **end, EVWatchList *elm) {
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190 cx_linked_list_remove(
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191 (void**)begin,
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192 (void**)end,
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193 offsetof(EVWatchList, prev),
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194 offsetof(EVWatchList, next),
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195 elm);
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196 }
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197
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198 void watchlist_check(EventHandler *h, time_t t) {
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199 if(t == 0) {
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200 t = time(NULL);
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201 }
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202
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203 log_ereport(LOG_DEBUG, "eventhandler: check watchlist");
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204
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205 EVWatchList *elm = h->watchlist_begin;
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206 while(elm) {
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207 EVWatchList *next = elm->next;
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208
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209 if(elm->expire < t) {
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210 ev_watchlist_remove(h, elm);
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211
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212 if(elm->destroy) {
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213 elm->destroy(h, elm);
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214 }
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215 }
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216
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217 elm = next;
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218 }
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219
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220
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221 }

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