appl/login/env.c

   1 /*
   2  * Copyright (c) 2000 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 "login_locl.h"
  35 RCSID("$Id$");
  36
  37 /*
  38  * the environment we will send to execle and the shell.
  39  */
  40
  41 char **env;
  42 int num_env;
  43
  44 void
  45 extend_env(char *str)
  46 {
  47     env = realloc(env, (num_env + 1) * sizeof(*env));
  48     if(env == NULL)
  49         errx(1, "Out of memory!");
  50     env[num_env++] = str;
  51 }
  52
  53 void
  54 add_env(const char *var, const char *value)
  55 {
  56     int i;
  57     char *str;
  58     asprintf(&str, "%s=%s", var, value);
  59     if(str == NULL)
  60         errx(1, "Out of memory!");
  61     for(i = 0; i < num_env; i++)
  62         if(strncmp(env[i], var, strlen(var)) == 0 &&
  63            env[i][strlen(var)] == '='){
  64             free(env[i]);
  65             env[i] = str;
  66             return;
  67         }
  68
  69     extend_env(str);
  70 }
  71
  72 #if !HAVE_DECL_ENVIRON
  73 extern char **environ;
  74 #endif
  75
  76
  77 void
  78 copy_env(void)
  79 {
  80     char **p;
  81     for(p = environ; *p; p++)
  82         extend_env(*p);
  83 }
  84
  85 void
  86 login_read_env(const char *file)
  87 {
  88     char **newenv;
  89     char *p;
  90     int i, j;
  91
  92     newenv = NULL;
  93     i = read_environment(file, &newenv);
  94     for (j = 0; j < i; j++) {
  95         p = strchr(newenv[j], '=');
  96         if (p == NULL)
  97             errx(1, "%s: missing = in string %s",
  98                  file, newenv[j]);
  99         *p++ = 0;
 100         add_env(newenv[j], p);
 101         *--p = '=';
 102         free(newenv[j]);
 103     }
 104     free(newenv);
 105 }