1 /* 2 * services/modstack.c - stack of modules 3 * 4 * Copyright (c) 2007, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file contains functions to help maintain a stack of modules. 40 */ 41 #include "config.h" 42 #include <ctype.h> 43 #include "services/modstack.h" 44 #include "util/module.h" 45 #include "util/fptr_wlist.h" 46 #include "iterator/iterator.h" 47 #include "validator/validator.h" 48 49 #ifdef WITH_PYTHONMODULE 50 #include "pythonmod/pythonmod.h" 51 #endif 52 53 /** count number of modules (words) in the string */ 54 static int 55 count_modules(const char* s) 56 { 57 int num = 0; 58 if(!s) 59 return 0; 60 while(*s) { 61 /* skip whitespace */ 62 while(*s && isspace((int)*s)) 63 s++; 64 if(*s && !isspace((int)*s)) { 65 /* skip identifier */ 66 num++; 67 while(*s && !isspace((int)*s)) 68 s++; 69 } 70 } 71 return num; 72 } 73 74 void 75 modstack_init(struct module_stack* stack) 76 { 77 stack->num = 0; 78 stack->mod = NULL; 79 } 80 81 int 82 modstack_config(struct module_stack* stack, const char* module_conf) 83 { 84 int i; 85 verbose(VERB_QUERY, "module config: \"%s\"", module_conf); 86 stack->num = count_modules(module_conf); 87 if(stack->num == 0) { 88 log_err("error: no modules specified"); 89 return 0; 90 } 91 if(stack->num > MAX_MODULE) { 92 log_err("error: too many modules (%d max %d)", 93 stack->num, MAX_MODULE); 94 return 0; 95 } 96 stack->mod = (struct module_func_block**)calloc((size_t) 97 stack->num, sizeof(struct module_func_block*)); 98 if(!stack->mod) { 99 log_err("out of memory"); 100 return 0; 101 } 102 for(i=0; i<stack->num; i++) { 103 stack->mod[i] = module_factory(&module_conf); 104 if(!stack->mod[i]) { 105 log_err("Unknown value for next module: '%s'", 106 module_conf); 107 return 0; 108 } 109 } 110 return 1; 111 } 112 113 /** The list of module names */ 114 const char** 115 module_list_avail(void) 116 { 117 /* these are the modules available */ 118 static const char* names[] = { 119 #ifdef WITH_PYTHONMODULE 120 "python", 121 #endif 122 "validator", 123 "iterator", 124 NULL}; 125 return names; 126 } 127 128 /** func block get function type */ 129 typedef struct module_func_block* (*fbgetfunctype)(void); 130 131 /** The list of module func blocks */ 132 static fbgetfunctype* 133 module_funcs_avail(void) 134 { 135 static struct module_func_block* (*fb[])(void) = { 136 #ifdef WITH_PYTHONMODULE 137 &pythonmod_get_funcblock, 138 #endif 139 &val_get_funcblock, 140 &iter_get_funcblock, 141 NULL}; 142 return fb; 143 } 144 145 struct 146 module_func_block* module_factory(const char** str) 147 { 148 int i = 0; 149 const char* s = *str; 150 const char** names = module_list_avail(); 151 fbgetfunctype* fb = module_funcs_avail(); 152 while(*s && isspace((int)*s)) 153 s++; 154 while(names[i]) { 155 if(strncmp(names[i], s, strlen(names[i])) == 0) { 156 s += strlen(names[i]); 157 *str = s; 158 return (*fb[i])(); 159 } 160 i++; 161 } 162 return NULL; 163 } 164 165 int 166 modstack_setup(struct module_stack* stack, const char* module_conf, 167 struct module_env* env) 168 { 169 int i; 170 if(stack->num != 0) 171 modstack_desetup(stack, env); 172 /* fixed setup of the modules */ 173 if(!modstack_config(stack, module_conf)) { 174 return 0; 175 } 176 env->need_to_validate = 0; /* set by module init below */ 177 for(i=0; i<stack->num; i++) { 178 verbose(VERB_OPS, "init module %d: %s", 179 i, stack->mod[i]->name); 180 fptr_ok(fptr_whitelist_mod_init(stack->mod[i]->init)); 181 if(!(*stack->mod[i]->init)(env, i)) { 182 log_err("module init for module %s failed", 183 stack->mod[i]->name); 184 return 0; 185 } 186 } 187 return 1; 188 } 189 190 void 191 modstack_desetup(struct module_stack* stack, struct module_env* env) 192 { 193 int i; 194 for(i=0; i<stack->num; i++) { 195 fptr_ok(fptr_whitelist_mod_deinit(stack->mod[i]->deinit)); 196 (*stack->mod[i]->deinit)(env, i); 197 } 198 stack->num = 0; 199 free(stack->mod); 200 stack->mod = NULL; 201 } 202 203 int 204 modstack_find(struct module_stack* stack, const char* name) 205 { 206 int i; 207 for(i=0; i<stack->num; i++) { 208 if(strcmp(stack->mod[i]->name, name) == 0) 209 return i; 210 } 211 return -1; 212 } 213