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annotate libfdcore/extensions.c @ 1327:82b386714795

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Set callback data also when only setting expire callback (and not answer callback as well). It is used when calling the expire callback, so not setting it makes no sense.
author Thomas Klausner <tk@giga.or.at>
date Mon, 27 Nov 2017 15:21:20 +0100
parents b25ca6134bdc
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@freediameter.net> *
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4 * *
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5 * Copyright (c) 2013, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 #include "fdcore-internal.h"
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37
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38 #include <dlfcn.h> /* We may use libtool's <ltdl.h> later for better portability.... */
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39 #include <libgen.h> /* for "basename" */
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40
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41 /* plugins management */
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42
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43 /* List of extensions to load, from the configuration parsing */
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44 struct fd_ext_info {
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45 struct fd_list chain; /* link in the list */
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46 char *filename; /* extension filename. must be a dynamic library with fd_ext_init symbol. */
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47 char *conffile; /* optional configuration file name for the extension */
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48 void *handler; /* object returned by dlopen() */
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49 const char **depends; /* names of the other extensions this one depends on (if provided) */
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50 char *ext_name; /* points to the extension name, either inside depends, or basename(filename) */
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51 int free_ext_name; /* must be freed if it was malloc'd */
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52 void (*fini)(void); /* optional address of the fd_ext_fini callback */
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53 };
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54
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55 /* list of extensions */
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56 static struct fd_list ext_list = FD_LIST_INITIALIZER(ext_list);
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57
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58 /* Add new extension */
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59 int fd_ext_add( char * filename, char * conffile )
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60 {
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61 struct fd_ext_info * new;
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62
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63 TRACE_ENTRY("%p %p", filename, conffile);
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64
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65 /* Check the filename is valid */
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66 CHECK_PARAMS( filename );
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67
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68 /* Create a new object in the list */
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69 CHECK_MALLOC( new = malloc( sizeof(struct fd_ext_info) ) );
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70 memset(new, 0, sizeof(struct fd_ext_info));
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71 fd_list_init(&new->chain, NULL);
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72 new->filename = filename;
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73 new->conffile = conffile;
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74 fd_list_insert_before( &ext_list, &new->chain );
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75 TRACE_DEBUG (FULL, "Extension %s added to the list.", filename);
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76 return 0;
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77 }
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78
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79 /* Dump the list */
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80 DECLARE_FD_DUMP_PROTOTYPE(fd_ext_dump)
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81 {
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82 struct fd_list * li;
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83 FD_DUMP_HANDLE_OFFSET();
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84
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85 if (FD_IS_LIST_EMPTY(&ext_list)) {
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86 CHECK_MALLOC_DO( fd_dump_extend( FD_DUMP_STD_PARAMS, "-none-"), return NULL);
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87 } else {
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88 for (li = ext_list.next; li != &ext_list; li = li->next)
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89 {
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90 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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91 CHECK_MALLOC_DO( fd_dump_extend( FD_DUMP_STD_PARAMS, "'%s'[%s], %sloaded%s",
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92 ext->filename,
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93 ext->conffile?:"(no config file)",
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94 ext->handler ? "" : "not ", (li->next == &ext_list) ? "":"\n"), return NULL);
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95 }
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96 }
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97 return *buf;
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98 }
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99
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100 /* Check the dependencies. The object must have been dlopened already. */
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101 static int check_dependencies(struct fd_ext_info * ext)
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102 {
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103 int i = 1;
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104 TRACE_ENTRY( "%p", ext );
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105
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106 /* Attempt to resolve the dependency array */
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107 ext->depends = dlsym( ext->handler, "fd_ext_depends" );
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108 if (!ext->depends) {
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109 /* Duplicate the filename */
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110 char * tmp = strdup(ext->filename);
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111 ext->ext_name = strdup(basename(tmp));
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112 free(tmp);
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113 ext->free_ext_name = 1;
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114 TRACE_DEBUG(FULL, "Old extension's [%s] API: missing dependencies (ignored)", ext->ext_name);
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115 return 0;
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116 }
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117
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118 ext->ext_name = (char *)ext->depends[0];
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119
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120 TRACE_DEBUG(FULL, "Checking dependencies for '%s'...", ext->ext_name);
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121
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122 while (ext->depends[i]) {
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123 struct fd_list * li;
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124 for (li = ext_list.next; li != &ext->chain; li = li->next)
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125 {
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126 struct fd_ext_info * e = (struct fd_ext_info *)li;
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127 if (!strcasecmp(e->ext_name, ext->depends[i])) {
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128 /* the dependency was already loaded */
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129 break;
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130 }
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131 }
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132
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133 if (li == &ext->chain) {
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134 /* the dependency was not found */
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135 LOG_F("Error: extension [%s] depends on [%s] which was not loaded first. Please fix your configuration file.",
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136 ext->ext_name, ext->depends[i]);
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137 return ESRCH;
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138 }
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139
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140 i++;
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141 }
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142
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143 /* All dependencies resolved successfully */
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144 return 0;
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145 }
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146
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147 /* Load all extensions in the list */
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148 int fd_ext_load()
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149 {
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150 int ret;
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151 int (*fd_ext_init)(int, int, char *) = NULL;
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152 struct fd_list * li;
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153
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154 TRACE_ENTRY();
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155
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156 /* Loop on all extensions */
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157 for (li = ext_list.next; li != &ext_list; li = li->next)
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158 {
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159 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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160 LOG_D( "Loading : %s", ext->filename);
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161
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162 /* Load the extension */
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163 #ifndef DEBUG
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164 ext->handler = dlopen(ext->filename, RTLD_LAZY | RTLD_GLOBAL);
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165 #else /* DEBUG */
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166 /* We resolve symbols immediatly so it's easier to find problems in ABI */
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167 ext->handler = dlopen(ext->filename, RTLD_NOW | RTLD_GLOBAL);
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168 #endif /* DEBUG */
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169 if (ext->handler == NULL) {
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170 /* An error occured */
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171 LOG_F("Loading of extension %s failed: %s", ext->filename, dlerror());
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172 ext->handler = dlopen(ext->filename, RTLD_LAZY | RTLD_GLOBAL);
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173 if (ext->handler) {
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174 if (!check_dependencies(ext)) {
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175 LOG_F("In addition, not all declared dependencies are satisfied (Internal Error!)");
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176 }
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177 }
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178 return EINVAL;
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179 }
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180
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181 /* Check if declared dependencies are satisfied. */
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182 CHECK_FCT( check_dependencies(ext) );
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183
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184 /* Resolve the entry point of the extension */
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185 fd_ext_init = ( int (*) (int, int, char *) )dlsym( ext->handler, "fd_ext_init" );
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186
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187 if (fd_ext_init == NULL) {
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188 /* An error occured */
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189 TRACE_ERROR("Unable to resolve symbol 'fd_ext_init' for extension %s: %s", ext->filename, dlerror());
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190 return EINVAL;
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191 }
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192
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193 /* Resolve the exit point of the extension, which is optional for extensions */
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194 ext->fini = ( void (*) (void) )dlsym( ext->handler, "fd_ext_fini" );
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195
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196 if (ext->fini == NULL) {
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197 /* Not provided */
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198 TRACE_DEBUG (FULL, "Extension [%s] has no fd_ext_fini function.", ext->filename);
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199 } else {
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200 /* Provided */
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201 TRACE_DEBUG (FULL, "Extension [%s] fd_ext_fini has been resolved successfully.", ext->filename);
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202 }
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203
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204 /* Now call the entry point to initialize the extension */
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205 ret = (*fd_ext_init)( FD_PROJECT_VERSION_MAJOR, FD_PROJECT_VERSION_MINOR, ext->conffile );
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206 if (ret != 0) {
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207 /* The extension was unable to load cleanly */
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208 TRACE_ERROR("Extension %s returned an error during initialization: %s", ext->filename, strerror(ret));
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209 return ret;
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210 }
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211
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212 /* Proceed to the next extension */
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213 }
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214
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215 LOG_N("All extensions loaded.");
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216
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217 /* We have finished. */
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218 return 0;
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219 }
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220
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221 /* Now unload the extensions and free the memory */
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222 int fd_ext_term( void )
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223 {
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224 TRACE_ENTRY();
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225
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226 /* Loop on all extensions, in FIFO order */
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227 while (!FD_IS_LIST_EMPTY(&ext_list))
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228 {
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229 struct fd_list * li = ext_list.next;
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230 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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231
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232 /* Unlink this element from the list */
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233 fd_list_unlink(li);
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234
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235 /* Call the exit point of the extension, if it was resolved */
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236 if (ext->fini != NULL) {
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237 TRACE_DEBUG (FULL, "Calling [%s]->fd_ext_fini function.", ext->ext_name ?: ext->filename);
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238 (*ext->fini)();
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239 }
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240
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241 #ifndef SKIP_DLCLOSE
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242 /* Now unload the extension */
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243 if (ext->handler) {
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244 TRACE_DEBUG (FULL, "Unloading %s", ext->ext_name ?: ext->filename);
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245 if ( dlclose(ext->handler) != 0 ) {
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246 TRACE_DEBUG (INFO, "Unloading [%s] failed : %s", ext->ext_name ?: ext->filename, dlerror());
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247 }
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248 }
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249 #endif /* SKIP_DLCLOSE */
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250
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251 /* Free the object and continue */
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252 if (ext->free_ext_name)
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253 free(ext->ext_name);
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254 free(ext->filename);
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255 free(ext->conffile);
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256 free(ext);
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257 }
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258
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259 /* We always return 0 since we would not handle an error anyway... */
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260 return 0;
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261 }
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262
"Welcome to our mercurial repository"