lib/hx509/env.c

   1 /*
   2  * Copyright (c) 2007 - 2008 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "hx_locl.h"
  35
  36 /**
  37  * @page page_env Hx509 enviroment functions
  38  *
  39  * See the library functions here: @ref hx509_env
  40  */
  41
  42 /**
  43  * Add a new key/value pair to the hx509_env.
  44  *
  45  * @param context A hx509 context.
  46  * @param env enviroment to add the enviroment variable too.
  47  * @param key key to add
  48  * @param value value to add
  49  *
  50  * @return An hx509 error code, see hx509_get_error_string().
  51  *
  52  * @ingroup hx509_env
  53  */
  54
  55 int
  56 hx509_env_add(hx509_context context, hx509_env *env,
  57               const char *key, const char *value)
  58 {
  59     hx509_env n;
  60
  61     n = malloc(sizeof(*n));
  62     if (n == NULL) {
  63         hx509_set_error_string(context, 0, ENOMEM, "out of memory");
  64         return ENOMEM;
  65     }
  66
  67     n->type = env_string;
  68     n->next = NULL;
  69     n->name = strdup(key);
  70     if (n->name == NULL) {
  71         free(n);
  72         return ENOMEM;
  73     }
  74     n->u.string = strdup(value);
  75     if (n->u.string == NULL) {
  76         free(n->name);
  77         free(n);
  78         return ENOMEM;
  79     }
  80
  81     /* add to tail */
  82     if (*env) {
  83         hx509_env e = *env;
  84         while (e->next)
  85             e = e->next;
  86         e->next = n;
  87     } else
  88         *env = n;
  89
  90     return 0;
  91 }
  92
  93 /**
  94  * Add a new key/binding pair to the hx509_env.
  95  *
  96  * @param context A hx509 context.
  97  * @param env enviroment to add the enviroment variable too.
  98  * @param key key to add
  99  * @param list binding list to add
 100  *
 101  * @return An hx509 error code, see hx509_get_error_string().
 102  *
 103  * @ingroup hx509_env
 104  */
 105
 106 int
 107 hx509_env_add_binding(hx509_context context, hx509_env *env,
 108                       const char *key, hx509_env list)
 109 {
 110     hx509_env n;
 111
 112     n = malloc(sizeof(*n));
 113     if (n == NULL) {
 114         hx509_set_error_string(context, 0, ENOMEM, "out of memory");
 115         return ENOMEM;
 116     }
 117
 118     n->type = env_list;
 119     n->next = NULL;
 120     n->name = strdup(key);
 121     if (n->name == NULL) {
 122         free(n);
 123         return ENOMEM;
 124     }
 125     n->u.list = list;
 126
 127     /* add to tail */
 128     if (*env) {
 129         hx509_env e = *env;
 130         while (e->next)
 131             e = e->next;
 132         e->next = n;
 133     } else
 134         *env = n;
 135
 136     return 0;
 137 }
 138
 139
 140 /**
 141  * Search the hx509_env for a length based key.
 142  *
 143  * @param context A hx509 context.
 144  * @param env enviroment to add the enviroment variable too.
 145  * @param key key to search for.
 146  * @param len length of key.
 147  *
 148  * @return the value if the key is found, NULL otherwise.
 149  *
 150  * @ingroup hx509_env
 151  */
 152
 153 const char *
 154 hx509_env_lfind(hx509_context context, hx509_env env,
 155                 const char *key, size_t len)
 156 {
 157     while(env) {
 158         if (strncmp(key, env->name ,len) == 0
 159             && env->name[len] == '\0' && env->type == env_string)
 160             return env->u.string;
 161         env = env->next;
 162     }
 163     return NULL;
 164 }
 165
 166 /**
 167  * Search the hx509_env for a key.
 168  *
 169  * @param context A hx509 context.
 170  * @param env enviroment to add the enviroment variable too.
 171  * @param key key to search for.
 172  *
 173  * @return the value if the key is found, NULL otherwise.
 174  *
 175  * @ingroup hx509_env
 176  */
 177
 178 const char *
 179 hx509_env_find(hx509_context context, hx509_env env, const char *key)
 180 {
 181     while(env) {
 182         if (strcmp(key, env->name) == 0 && env->type == env_string)
 183             return env->u.string;
 184         env = env->next;
 185     }
 186     return NULL;
 187 }
 188
 189 /**
 190  * Search the hx509_env for a binding.
 191  *
 192  * @param context A hx509 context.
 193  * @param env enviroment to add the enviroment variable too.
 194  * @param key key to search for.
 195  *
 196  * @return the binding if the key is found, NULL if not found.
 197  *
 198  * @ingroup hx509_env
 199  */
 200
 201 hx509_env
 202 hx509_env_find_binding(hx509_context context,
 203                        hx509_env env,
 204                        const char *key)
 205 {
 206     while(env) {
 207         if (strcmp(key, env->name) == 0 && env->type == env_list)
 208             return env->u.list;
 209         env = env->next;
 210     }
 211     return NULL;
 212 }
 213
 214 static void
 215 env_free(hx509_env b)
 216 {
 217     while(b) {
 218         hx509_env next = b->next;
 219
 220         if (b->type == env_string)
 221             free(b->u.string);
 222         else if (b->type == env_list)
 223             env_free(b->u.list);
 224
 225         free(b->name);
 226         free(b);
 227         b = next;
 228     }
 229 }
 230
 231 /**
 232  * Free an hx509_env enviroment context.
 233  *
 234  * @param env the enviroment to free.
 235  *
 236  * @ingroup hx509_env
 237  */
 238
 239 void
 240 hx509_env_free(hx509_env *env)
 241 {
 242     if (*env)
 243         env_free(*env);
 244     *env = NULL;
 245 }