usr.sbin/installer/libinstaller/confed.c

   1 /*
   2  * Copyright (c)2004 The DragonFly Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  *   Redistributions of source code must retain the above copyright
   9  *   notice, this list of conditions and the following disclaimer.
  10  *
  11  *   Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in
  13  *   the documentation and/or other materials provided with the
  14  *   distribution.
  15  *
  16  *   Neither the name of the DragonFly Project nor the names of its
  17  *   contributors may be used to endorse or promote products derived
  18  *   from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  26  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  27  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  29  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  31  * OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * confed.c
  36  * Functions for working with configuration files.
  37  * Inspired by (but not derived from) sysinstall's variable.c
  38  * $Id: confed.c,v 1.16 2005/02/06 21:05:18 cpressey Exp $
  39  */
  40
  41 #include <sys/stat.h>
  42
  43 #include <ctype.h>
  44 #include <stdarg.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <time.h>
  49 #include <unistd.h>
  50
  51 #include "libaura/mem.h"
  52 #include "libaura/dict.h"
  53 #include "libdfui/system.h"
  54
  55 #include "confed.h"
  56 #include "commands.h"
  57 #include "functions.h"
  58
  59 /*
  60  * Create a new, empty set of in-memory config variable settings.
  61  */
  62 struct config_vars *
  63 config_vars_new(void)
  64 {
  65         struct config_vars *cvs;
  66
  67         AURA_MALLOC(cvs, config_vars);
  68
  69         cvs->d = aura_dict_new(1, AURA_DICT_SORTED_LIST);
  70
  71         return(cvs);
  72 }
  73
  74 /*
  75  * Deallocate the memory used by a set of config variable settings.
  76  */
  77 void
  78 config_vars_free(struct config_vars *cvs)
  79 {
  80         if (cvs == NULL)
  81                 return;
  82
  83         aura_dict_free(cvs->d);
  84
  85         AURA_FREE(cvs, config_vars);
  86 }
  87
  88 /*
  89  * Get the value of a configuration variable in a set of settings
  90  * and return it, or a (constant) 0-length string if not found.
  91  */
  92 const char *
  93 config_var_get(const struct config_vars *cvs, const char *name)
  94 {
  95         void *rv;
  96         size_t rv_len;
  97
  98         aura_dict_fetch(cvs->d, name, strlen(name) + 1, &rv, &rv_len);
  99         if (rv == NULL)
 100                 return("");
 101         else
 102                 return(rv);
 103 }
 104
 105 /*
 106  * Set the value of a configuration variable.  If the named variable
 107  * does not exist within the given set, a new one is created.
 108  */
 109 int
 110 config_var_set(struct config_vars *cvs, const char *name, const char *value)
 111 {
 112         aura_dict_store(cvs->d,
 113             name, strlen(name) + 1,
 114             value, strlen(value) + 1);
 115         return(1);
 116 }
 117
 118 /*
 119  * Write a set of configuration variable settings to a file.
 120  */
 121 int
 122 config_vars_write(const struct config_vars *cvs, int config_type, const char *fmt, ...)
 123 {
 124         FILE *f;
 125         va_list args;
 126         char *filename;
 127         char tstr[256];
 128         int conf_written = 0;
 129         time_t t;
 130         void *rk, *rv;
 131         size_t rk_len, rv_len;
 132
 133         va_start(args, fmt);
 134         vasprintf(&filename, fmt, args);
 135         va_end(args);
 136
 137         if ((f = fopen(filename, "a")) == NULL)
 138                 return(0);
 139
 140         time(&t);
 141         strlcpy(tstr, ctime(&t), 256);
 142         if (strlen(tstr) > 0)
 143                 tstr[strlen(tstr) - 1] = '\0';
 144
 145         switch (config_type) {
 146         case CONFIG_TYPE_SH:
 147
 148                 aura_dict_rewind(cvs->d);
 149                 while (!aura_dict_eof(cvs->d)) {
 150                         if (! conf_written) {
 151                                 conf_written = 1;
 152                                 fprintf(f, "\n");
 153                                 fprintf(f, "# -- BEGIN %s "
 154                                     "Installer automatically generated "
 155                                     "configuration  -- #\n",
 156                                     OPERATING_SYSTEM_NAME);
 157                                 fprintf(f, "# -- Written on %s -- #\n", tstr);
 158                         }
 159                         aura_dict_get_current_key(cvs->d, &rk, &rk_len),
 160                         aura_dict_fetch(cvs->d, rk, rk_len, &rv, &rv_len);
 161                         fprintf(f, "%s=\"%s\"\n", (char *)rk, (char *)rv);
 162                         aura_dict_next(cvs->d);
 163                 }
 164                 if (conf_written) {
 165                         fprintf(f, "# -- END of %s Installer "
 166                             "automatically generated configuration -- #\n",
 167                             OPERATING_SYSTEM_NAME);
 168                 }
 169                 break;
 170         case CONFIG_TYPE_RESOLV:
 171                 aura_dict_rewind(cvs->d);
 172                 while (!aura_dict_eof(cvs->d)) {
 173                         aura_dict_get_current_key(cvs->d, &rk, &rk_len),
 174                         aura_dict_fetch(cvs->d, rk, rk_len, &rv, &rv_len);
 175                         fprintf(f, "%s\t\t%s\n", (char *)rk, (char *)rv);
 176                         aura_dict_next(cvs->d);
 177                 }
 178                 break;
 179         default:
 180                 fclose(f);
 181                 return(0);
 182         }
 183
 184         fclose(f);
 185         return(1);
 186 }
 187
 188 /*
 189  * Read variables from a file.
 190  * Returns 1 if the variables could be read successfully, 0 if not.
 191  */
 192 int
 193 config_vars_read(struct i_fn_args *a, struct config_vars *cvs,
 194                  int config_type __unused, const char *fmt, ...)
 195 {
 196         struct commands *cmds;
 197         char *filename, *tmp_filename, line[1024], *value;
 198         FILE *f, *script;
 199         va_list args;
 200
 201         va_start(args, fmt);
 202         vasprintf(&filename, fmt, args);
 203         va_end(args);
 204
 205         asprintf(&tmp_filename, "%sextract_vars", a->tmp);
 206         script = fopen(tmp_filename, "w");
 207         free(tmp_filename);
 208         if (script == NULL)
 209                 return(0);
 210
 211         fprintf(script, "set | %susr/bin/sort >%senv.before\n", a->os_root, a->tmp);
 212         fprintf(script, ". %s%s\n", a->os_root, filename);
 213         fprintf(script, "set | %susr/bin/sort >%senv.after\n", a->os_root, a->tmp);
 214         fprintf(script, "%susr/bin/comm -1 -3 %senv.before %senv.after | \\\n",
 215             a->os_root, a->tmp, a->tmp);
 216         fprintf(script, "    %susr/bin/awk -F= '{ print $1 }' | \\\n", a->os_root);
 217         fprintf(script, "    while read __VARNAME; do\n");
 218         fprintf(script, "        echo -n ${__VARNAME}=\n");
 219         fprintf(script, "        eval echo ' $'${__VARNAME}\n");
 220         fprintf(script, "    done\n");
 221         fprintf(script, "%sbin/rm -f %senv.before %senv.after\n",
 222             a->os_root, a->tmp, a->tmp);
 223         fclose(script);
 224
 225         cmds = commands_new();
 226         command_add(cmds, "%sbin/sh %sextract_vars >%sextracted_vars.txt",
 227             a->os_root, a->tmp, a->tmp);
 228         temp_file_add(a, "extracted_vars.txt");
 229         if (!commands_execute(a, cmds)) {
 230                 commands_free(cmds);
 231                 return(0);
 232         }
 233         commands_free(cmds);
 234
 235         /*
 236          * Delete the script immediately.
 237          */
 238         asprintf(&tmp_filename, "%sextract_vars", a->tmp);
 239         (void)unlink(tmp_filename);     /* not much we can do if it fails */
 240         free(tmp_filename);
 241
 242         asprintf(&tmp_filename, "%sextracted_vars.txt", a->tmp);
 243         f = fopen(tmp_filename, "r");
 244         free(tmp_filename);
 245         if (f == NULL)
 246                 return(0);
 247         while (fgets(line, 1024, f) != NULL) {
 248                 if (strlen(line) > 0)
 249                         line[strlen(line) - 1] = '\0';
 250                 /* split line at first = */
 251                 for (value = line; *value != '=' && *value != '\0'; value++)
 252                         ;
 253                 if (*value == '\0')
 254                         break;
 255                 *value = '\0';
 256                 value++;
 257                 config_var_set(cvs, line, value);
 258         }
 259         fclose(f);
 260
 261         return(1);
 262 }