summaryrefslogtreecommitdiffstats
path: root/c/src/libmisc/rootfs/mkrootfs.c
blob: eff49ff9a0b26bdadd3ae18e2ac9a7357ea9db3a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
/*
  ------------------------------------------------------------------------
  $Id$
  ------------------------------------------------------------------------
  
  Copyright Cybertec Pty Ltd, 2000
  All rights reserved Cybertec Pty Ltd, 2000

  COPYRIGHT (c) 1989-1998.
  On-Line Applications Research Corporation (OAR).

  The license and distribution terms for this file may be
  found in the file LICENSE in this distribution or at
  
  http://www.OARcorp.com/rtems/license.html.

  This software with is provided ``as is'' and with NO WARRANTY.

  ------------------------------------------------------------------------

  Set of helpers when creating a root file system. The root filesystem
  in RTEMS is the In Memory Filesystem (IMFS). We could copy an exiting
  filesystem to here, how-ever a number of files can have target
  specific initialisation info which we need to write.
  
 */

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <rtems/mkrootfs.h>

/*
 * A table a list of names and their modes.
 */

typedef struct rtems_rootfs_dir_table
{
  const char *name;
  int        mode;
} rtems_rootfs_dir_table;

/*
 * Table of directorys to make.
 */

static const rtems_rootfs_dir_table default_directories[] =
{
  { "/bin",     S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH },
  { "/etc",     S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH },
  { "/dev",     S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH },
  { "/usr/bin", S_IFDIR | S_IRWXU | S_IXGRP | S_IRGRP | S_IROTH | S_IXOTH }
};

#define MKFILE_MODE (S_IRUSR | S_IWUSR | S_IWGRP | S_IRGRP | S_IROTH)
#define MKDIR_MODE  (S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)

/*
 * Build a path. Taken from the BSD `mkdir' command.
 */

int
rtems_rootfs_mkdir (const char *path_orig, mode_t omode)
{
  struct stat sb;
  mode_t      numask, oumask;
  int         first, last, retval;
  char        path[128];
  char        *p = path;

  if (strlen (path_orig) >= sizeof path)
  {
    printf ("root fs: mkdir path too long `%s'\n", path);
    return -1;
  }
    
  strcpy (path, path_orig);
  oumask = 0;
  retval = 0;
  if (p[0] == '/')    /* Skip leading '/'. */
    ++p;
  for (first = 1, last = 0; !last ; ++p)
  {
    if (p[0] == '\0')
      last = 1;
    else if (p[0] != '/')
      continue;
    *p = '\0';
    if (p[1] == '\0')
      last = 1;
    if (first)
    {
      /*
       * POSIX 1003.2:
       * For each dir operand that does not name an existing
       * directory, effects equivalent to those cased by the
       * following command shall occcur:
       *
       * mkdir -p -m $(umask -S),u+wx $(dirname dir) &&
       *    mkdir [-m mode] dir
       *
       * We change the user's umask and then restore it,
       * instead of doing chmod's.
       */
      oumask = umask(0);
      numask = oumask & ~(S_IWUSR | S_IXUSR);
      umask(numask);
      first = 0;
    }
    if (last)
      umask(oumask);
    if (stat(path, &sb))
    {
      if (errno != ENOENT)
      {
        printf ("root fs: error stat'ing path `%s', %s\n",
                path, strerror (errno));
        retval = 1;
        break;
      }
      if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0)
      {
        printf ("root fs: error building path `%s', %s\n",
                path, strerror (errno));
        retval = 1;
        break;
      }
    }
    else if ((sb.st_mode & S_IFMT) != S_IFDIR)
    {
      if (last)
        errno = EEXIST;
      else
        errno = ENOTDIR;
      printf ("root fs: path `%s' contains a file, %s\n",
              path, strerror (errno));
      retval = 1;
      break;
    }
    if (!last)
      *p = '/';
  }
  if (!first && !last)
    umask(oumask);
  return retval;
}

/*
 * Create enough files to support the networking stack.
 * Points to a table of strings.
 */

int
rtems_rootfs_file_append (const char *file,
                          mode_t     omode,
                          const int  line_cnt,
                          const char **lines)
{
  struct stat sb;
  int         fd;
  int         i;

  /*
   * See is a file exists. If it does not, create the
   * file and the path to the file.
   */

  fd = -1;
  
  if (stat(file, &sb))
  {
    if (errno == ENOENT)
    {
      /*
       * Get the path to the file if one exists and create the
       * path. If it exists nothing happens.
       */

      int i = strlen (file);

      while (i)
      {
        if (file[i] == '/')
        {
          char path[128];

          if (i >= sizeof path)
          {
            printf ("root fs, path too long `%s'\n", file);
            return -1;
          }

          strncpy (path, file, i);
          path[i] = '\0';
          
          if (rtems_rootfs_mkdir (path, MKDIR_MODE))
            return -1;
          break;
        }
        i--;
      }
      
      if ((fd = open (file, O_CREAT | O_APPEND | O_WRONLY, omode)) < 0)
      {
        printf ("root fs, cannot create file `%s' : %s\n",
                file, strerror (errno));
        return -1;
      }
    }
  }

  if (fd < 0)
  {
    if ((fd = open (file, O_APPEND | O_WRONLY)) < 0)
    {
      printf ("root fs, cannot open file `%s' : %s\n",
              file, strerror (errno));
      return -1;
    }
  }
  
  for (i = 0; i < line_cnt; i++)
  {
    int len = strlen (lines[i]);

    if (len)
    {
      if (write (fd, lines[i], strlen (lines[i])) < 0)
      {
        close (fd);
        printf ("root fs, cannot write to `%s' : %s\n",
                file, strerror (errno));
        return -1;
      }
    }
  }
  
  return close (fd);
}

/*
 * Write hosts record.
 */

int
rtems_rootfs_append_host_rec (unsigned long cip,
                              const char    *cname,
                              const char    *dname)
{
  char           buf[128];
  char           *bufp = buf;
  const char     *bufl[1];
  struct in_addr ip;

  ip.s_addr = cip;
  
  if (cname && strlen (cname))
  {
    snprintf (bufp, sizeof (buf), "%s\t\t%s", inet_ntoa (ip), cname);
    bufp += strlen (buf);

    if (dname && strlen (dname))
    {
      snprintf (bufp, sizeof (buf), "\t\t%s.%s", cname, dname);
      bufp += strlen (buf);
    }
    
    strcat (buf, "\n");
 
    bufl[0] = buf;
    
    if (rtems_rootfs_file_append ("/etc/hosts", MKFILE_MODE, 1, bufl) < 0)
      return -1;
  }
  else
  {
    printf ("rootfs hosts rec append, no cname supplied\n");
    return -1;
  }

  return 0;
}

/*
 * Create a root file system.
 */

int
rtems_create_root_fs ()
{
  const char *lines[1];
  int        i;
  
  /*
   * Create the directories.
   */

  for (i = 0;
       i < (sizeof (default_directories) / sizeof (rtems_rootfs_dir_table));
       i++)
    if (rtems_rootfs_mkdir (default_directories[i].name,
                            default_directories[i].mode))
      return -1;

  /*
   * /etc/passwd, /etc/group
   * Maybe needed by some tools.
   */

  lines[0] = "root::0:0:root:/root:/bin/sh\n";
  
  if (rtems_rootfs_file_append ("/etc/passwd", MKFILE_MODE, 1, lines))
    return -1;
  
  lines[0] = "root::0:root\n";
  
  if (rtems_rootfs_file_append ("/etc/group", MKFILE_MODE, 1, lines))
    return -1;

  /*
   * The TCP/IP stack likes this one. If DNS does not work
   * use the host file.
   */
  
  lines[0] = "hosts,bind\n";
  
  if (rtems_rootfs_file_append ("/etc/host.conf", MKFILE_MODE, 1, lines))
    return -1;
  
  /*
   * Create a `/etc/hosts' file.
   */

  if (rtems_rootfs_append_host_rec (0x7f000001, "localhost", "localdomain"))
    return -1;
  
  return 0;
}