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annotate libfdcore/extensions.c @ 882:ae96ae28f3dd 1.1.5

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Limit python version to avoid using python3 (not compatible)
author Sebastien Decugis <sdecugis@freediameter.net>
date Sat, 03 Nov 2012 18:45:41 +0100
parents 1d2721778c7a
children 2091bf698fb1
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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) 2012, 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 void fd_ext_dump(void)
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81 {
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82 struct fd_list * li;
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83
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84 fd_log_debug("Dumping extensions list :\n");
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85
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86 for (li = ext_list.next; li != &ext_list; li = li->next)
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87 {
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88 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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89 fd_log_debug(" - '%s'[%s] is %sloaded\n", ext->filename, ext->conffile?:"no conf", ext->handler ? "" : "not ");
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90 }
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91 }
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92
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93 /* Check the dependencies. The object must have been dlopened already. */
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94 static int check_dependencies(struct fd_ext_info * ext)
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95 {
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96 int i = 1;
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97 TRACE_ENTRY( "%p", ext );
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98
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99 /* Attempt to resolve the dependency array */
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100 ext->depends = dlsym( ext->handler, "fd_ext_depends" );
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101 if (!ext->depends) {
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102 /* Duplicate the filename */
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103 char * tmp = strdup(ext->filename);
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104 ext->ext_name = strdup(basename(tmp));
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105 free(tmp);
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106 ext->free_ext_name = 1;
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107 TRACE_DEBUG(FULL, "Old extension's [%s] API: missing dependencies (ignored)", ext->ext_name);
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108 return 0;
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109 }
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110
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111 ext->ext_name = (char *)ext->depends[0];
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112
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113 TRACE_DEBUG(FULL, "Checking dependencies for '%s'...", ext->ext_name);
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114
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115 while (ext->depends[i]) {
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116 struct fd_list * li;
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117 for (li = ext_list.next; li != &ext->chain; li = li->next)
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118 {
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119 struct fd_ext_info * e = (struct fd_ext_info *)li;
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120 if (!strcasecmp(e->ext_name, ext->depends[i])) {
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121 /* the dependency was already loaded */
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122 break;
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123 }
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124 }
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125
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126 if (li == &ext->chain) {
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127 /* the dependency was not found */
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128 TRACE_DEBUG(NONE, "Error: extension [%s] depends on [%s] which was not loaded first.\nPlease fix your configuration file.",
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129 ext->ext_name, ext->depends[i]);
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130 return ESRCH;
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131 }
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132
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133 i++;
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134 }
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135
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136 /* All dependencies resolved successfully */
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137 return 0;
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138 }
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139
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140 /* Load all extensions in the list */
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141 int fd_ext_load()
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142 {
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143 int ret;
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144 int (*fd_ext_init)(int, int, char *) = NULL;
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145 struct fd_list * li;
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146
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147 TRACE_ENTRY();
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148
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149 /* Loop on all extensions */
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150 for (li = ext_list.next; li != &ext_list; li = li->next)
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151 {
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152 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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153 TRACE_DEBUG (INFO, "Loading : %s", ext->filename);
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154
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155 /* Load the extension */
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156 #ifndef DEBUG
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157 ext->handler = dlopen(ext->filename, RTLD_LAZY | RTLD_GLOBAL);
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158 #else /* DEBUG */
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159 /* We resolve symbols immediatly so it's easier to find problems in ABI */
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160 ext->handler = dlopen(ext->filename, RTLD_NOW | RTLD_GLOBAL);
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161 #endif /* DEBUG */
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162 if (ext->handler == NULL) {
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163 /* An error occured */
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164 TRACE_DEBUG( NONE, "Loading of extension %s failed:\n %s", ext->filename, dlerror());
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165 #ifdef DEBUG
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166 ext->handler = dlopen(ext->filename, RTLD_LAZY | RTLD_GLOBAL);
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167 if (ext->handler) {
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168 if (!check_dependencies(ext)) {
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169 TRACE_DEBUG( NONE, "In addition, all declared dependencies are satisfied (Internal Error!)\n");
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170 }
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171 }
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172 #endif /* DEBUG */
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173 return EINVAL;
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174 }
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175
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176 /* Check if declared dependencies are satisfied. */
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177 CHECK_FCT( check_dependencies(ext) );
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178
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179 /* Resolve the entry point of the extension */
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180 fd_ext_init = ( int (*) (int, int, char *) )dlsym( ext->handler, "fd_ext_init" );
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181
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182 if (fd_ext_init == NULL) {
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183 /* An error occured */
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184 TRACE_DEBUG( NONE, "Unable to resolve symbol 'fd_ext_init' for extension %s:\n %s\n", ext->filename, dlerror());
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185 return EINVAL;
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186 }
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187
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188 /* Resolve the exit point of the extension, which is optional for extensions */
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189 ext->fini = ( void (*) (void) )dlsym( ext->handler, "fd_ext_fini" );
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190
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191 if (ext->fini == NULL) {
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192 /* Not provided */
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193 TRACE_DEBUG (FULL, "Extension [%s] has no fd_ext_fini function.", ext->filename);
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194 } else {
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195 /* Provided */
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196 TRACE_DEBUG (FULL, "Extension [%s] fd_ext_fini has been resolved successfully.", ext->filename);
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197 }
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198
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199 /* Now call the entry point to initialize the extension */
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200 ret = (*fd_ext_init)( FD_PROJECT_VERSION_MAJOR, FD_PROJECT_VERSION_MINOR, ext->conffile );
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201 if (ret != 0) {
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202 /* The extension was unable to load cleanly */
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203 TRACE_DEBUG( NONE, "Extension %s returned an error during initialization: %s\n", ext->filename, strerror(ret));
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204 return ret;
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205 }
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206
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207 /* Proceed to the next extension */
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208 }
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209
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210 TRACE_DEBUG (INFO, "All extensions loaded.");
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211
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212 /* We have finished. */
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213 return 0;
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214 }
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215
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216 /* Now unload the extensions and free the memory */
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217 int fd_ext_term( void )
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218 {
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219 TRACE_ENTRY();
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220
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221 /* Loop on all extensions, in FIFO order */
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222 while (!FD_IS_LIST_EMPTY(&ext_list))
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223 {
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224 struct fd_list * li = ext_list.next;
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225 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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226
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227 /* Unlink this element from the list */
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228 fd_list_unlink(li);
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229
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230 /* Call the exit point of the extension, if it was resolved */
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231 if (ext->fini != NULL) {
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232 TRACE_DEBUG (FULL, "Calling [%s]->fd_ext_fini function.", ext->ext_name ?: ext->filename);
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233 (*ext->fini)();
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234 }
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235
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236 #ifndef SKIP_DLCLOSE
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237 /* Now unload the extension */
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238 if (ext->handler) {
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239 TRACE_DEBUG (FULL, "Unloading %s", ext->ext_name ?: ext->filename);
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240 if ( dlclose(ext->handler) != 0 ) {
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241 TRACE_DEBUG (INFO, "Unloading [%s] failed : %s\n", ext->ext_name ?: ext->filename, dlerror());
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242 }
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243 }
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244 #endif /* SKIP_DLCLOSE */
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245
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246 /* Free the object and continue */
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247 if (ext->free_ext_name)
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248 free(ext->ext_name);
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249 free(ext->filename);
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250 free(ext->conffile);
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251 free(ext);
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252 }
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253
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254 /* We always return 0 since we would not handle an error anyway... */
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255 return 0;
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256 }
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257
"Welcome to our mercurial repository"