src/util-misc.c

   1 /*
   2     Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
   3     Ben Kibbey <bjk@luxsci.net>
   4
   5     This file is part of pwmd.
   6
   7     Pwmd is free software: you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation, either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     Pwmd is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with Pwmd.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <string.h>
  32 #include <ctype.h>
  33 #include <pwd.h>
  34
  35 #include "pwmd-error.h"
  36 #include <gcrypt.h>
  37 #include "util-misc.h"
  38 #include "util-string.h"
  39 #include "mutex.h"
  40 #include "cache.h"
  41 #include "mem.h"
  42
  43 extern void log_write (const char *fmt, ...);
  44
  45 int
  46 valid_filename (const char *filename)
  47 {
  48   const char *p;
  49
  50   if (!filename || !*filename)
  51     return 0;
  52
  53   if (filename[0] == '-' && filename[1] == 0)
  54     return 0;
  55
  56   for (p = filename; *p; p++)
  57     {
  58       if (*p == '/' || isspace (*p))
  59         return 0;
  60     }
  61
  62   return 1;
  63 }
  64
  65 char *
  66 get_username ()
  67 {
  68   struct passwd *pw = getpwuid (getuid ());
  69
  70   return pw ? pw->pw_name : NULL;
  71 }
  72
  73 char *
  74 get_home_dir ()
  75 {
  76 #ifdef HAVE_GETPWNAM_R
  77   struct passwd pw, *result;
  78   size_t len;
  79   char *buf;
  80
  81   if (home_directory)
  82     return home_directory;
  83
  84   len = sysconf (_SC_GETPW_R_SIZE_MAX);
  85   if (len == -1)
  86     len = 16384;
  87
  88   buf = xmalloc (len);
  89   if (!buf)
  90     return NULL;
  91
  92   if (!getpwuid_r (getuid (), &pw, buf, len, &result))
  93     home_directory = str_dup (result->pw_dir);
  94
  95   xfree (buf);
  96 #else
  97   struct passwd *result = getpwuid (getuid ());
  98
  99   if (result)
 100     home_directory = str_dup (result->pw_dir);
 101 #endif
 102
 103   return home_directory;
 104 }
 105
 106 char *
 107 expand_homedir (char *str)
 108 {
 109   char *p = str;
 110
 111   if (*p++ == '~')
 112     return str_asprintf ("%s%s", get_home_dir (), p);
 113
 114   return str_dup (str);
 115 }
 116
 117 gpg_error_t
 118 parse_options (char **line, struct argv_s * args[], void *data)
 119 {
 120   char *p = *line;
 121   gpg_error_t rc = 0;
 122
 123   for (; p && *p; p++)
 124     {
 125       while (*p == ' ')
 126         p++;
 127
 128       if (!*p)
 129         break;
 130
 131       if (*p == '-' && *(p + 1) == '-')
 132         {
 133           p += 2;
 134           char opt[255] = { 0 }, value[255] =
 135           {
 136           0};
 137           char *tp;
 138           unsigned len;
 139
 140           if (!*p || *p == ' ')
 141             {
 142               if (*p)
 143                 p++;
 144
 145               break;
 146             }
 147
 148           for (tp = opt, len = 0; *p; p++, len++)
 149             {
 150               if (len + 1 == 255)
 151                 return GPG_ERR_LINE_TOO_LONG;
 152
 153               if (*p == ' ' || *p == '=')
 154                 {
 155                   int inquote = 0;
 156
 157                   *tp = 0;
 158
 159                   if (*p == '=')
 160                     {
 161                       p++;
 162
 163                       for (tp = value, len = 0; *p; p++, len++)
 164                         {
 165                           if (len + 1 == 255)
 166                             return GPG_ERR_LINE_TOO_LONG;
 167
 168                           if (*p == '\"')
 169                             {
 170                               inquote = !inquote;
 171                               continue;
 172                             }
 173                           else if (*p == ' ' && !inquote)
 174                             break;
 175
 176                           *tp++ = *p;
 177                         }
 178
 179                       *tp = 0;
 180                     }
 181
 182                   break;
 183                 }
 184
 185               *tp++ = *p;
 186             }
 187
 188           *tp = 0;
 189           int match = 0;
 190
 191           for (int i = 0; args[i]; i++)
 192             {
 193               if (!strcmp (args[i]->opt, opt))
 194                 {
 195                   log_write1 ("param: name='%s' value='%s'", opt, value);
 196                   if (args[i]->type == OPTION_TYPE_NOARG && *value)
 197                     return GPG_ERR_SYNTAX;
 198                   else if (args[i]->type == OPTION_TYPE_ARG && !*value)
 199                     return GPG_ERR_SYNTAX;
 200
 201                   rc = args[i]->func (data, value);
 202
 203                   if (rc)
 204                     return rc;
 205
 206                   match = 1;
 207                   break;
 208                 }
 209             }
 210
 211           if (!match)
 212             return GPG_ERR_UNKNOWN_OPTION;
 213
 214           if (!*p)
 215             break;
 216
 217           continue;
 218         }
 219
 220       break;
 221     }
 222
 223   *line = p;
 224   return rc;
 225 }
 226
 227 char *
 228 bin2hex (const unsigned char *data, size_t len)
 229 {
 230   size_t size = len * 2 + 1;
 231   char buf[size];
 232   size_t n;
 233
 234   buf[0] = 0;
 235
 236   for (n = 0; n < len; n++)
 237     {
 238       char c[3];
 239
 240       sprintf (c, "%02X", data[n]);
 241       strcat (buf, c);
 242     }
 243
 244   return str_dup (buf);
 245 }
 246
 247 char *
 248 plus_escape (const char *fmt, ...)
 249 {
 250   va_list ap;
 251   char *str;
 252
 253   va_start (ap, fmt);
 254
 255   if (str_vasprintf (&str, fmt, ap) > 0)
 256     {
 257       char *p;
 258
 259       for (p = str; *p; p++)
 260         {
 261           if (*p == ' ')
 262             *p = '+';
 263         }
 264
 265       va_end (ap);
 266       return str;
 267     }
 268
 269   va_end (ap);
 270   return NULL;
 271 }
 272
 273 static char *
 274 strip_texi (const char *str)
 275 {
 276   const char *p;
 277   char *s = str_dup (str);
 278   int c = 0;
 279
 280   if (!s)
 281     return NULL;
 282
 283   for (p = str; *p; p++)
 284     {
 285       if (*p == '@' && *(p + 1) != '@')
 286         {
 287           if (!strncasecmp (p + 1, "table", 5)
 288               || !strncasecmp (p + 1, "end ", 4))
 289             {
 290               while (*p++ != '\n');
 291               p--;
 292               continue;
 293             }
 294           else if (!strncasecmp (p + 1, "example", 7)
 295                    || !strncasecmp (p + 1, "end ", 4))
 296             {
 297               while (*p++ != '\n');
 298               p--;
 299               continue;
 300             }
 301           else if (!strncasecmp (p + 1, "sp ", 3))
 302             {
 303               p += 3;
 304
 305               while (*p && isdigit (*p++))
 306                 p++;
 307               continue;
 308             }
 309           else if (!strncasecmp (p + 1, "item", 4))
 310             {
 311               p += 5;
 312               while (*p && *p != '\n')
 313                 s[c++] = *p++;
 314
 315               continue;
 316             }
 317           else if (!strncasecmp (p + 1, "pxref", 5))
 318             {
 319               p += 6;
 320               strcat (s, "see ");
 321               c = strlen (s);
 322               goto close;
 323             }
 324           else if (!strncasecmp (p + 1, "xref", 4))
 325             {
 326               p += 5;
 327               strcat (s, "See ");
 328               c = strlen (s);
 329               goto close;
 330             }
 331
 332           while (*p && *p != '{')
 333             {
 334               if (*++p == '*')
 335                 {
 336                   p++;
 337                   goto append;
 338                 }
 339             }
 340
 341         close:
 342           if (*p)
 343             {
 344               p++;
 345               s[c++] = '`';
 346               while (*p && *p != '}')
 347                 s[c++] = *p++;
 348
 349               if (*p)
 350                 p++;
 351
 352               s[c++] = '\'';
 353             }
 354         }
 355       else if (*p == '@' && *(p + 1) == '@')
 356         p++;
 357
 358     append:
 359       if (*p)
 360         s[c++] = *p;
 361
 362       s[c] = 0;
 363     }
 364
 365   s[c] = 0;
 366   return s;
 367 }
 368
 369
 370 char *
 371 strip_texi_and_wrap (const char *str)
 372 {
 373   char *tmp = strip_texi (str);
 374   char *help = xmalloc (strlen (tmp + 1) * 2);
 375   char *p, *ph;
 376   int i;
 377
 378   for (p = tmp, ph = help, i = 0; *p; p++, i++)
 379     {
 380       if (i == 78 || *p == '\n')
 381         {
 382           if (!isspace (*p))
 383             {
 384               char *t = ph;
 385               int n = 0;
 386
 387               while (!(*--t == ' '))
 388                 n++;
 389
 390               *t++ = '\n';
 391               i = -1;
 392               p -= n;
 393               while (n--)
 394                 {
 395                   *t++ = *p++;
 396                   i++;
 397                 }
 398             }
 399           else
 400             {
 401               *ph++ = '\n';
 402               i = -1;
 403               while (*p != '\n' && *p == ' ')
 404                 p++;
 405             }
 406         }
 407
 408       *ph++ = *p;
 409     }
 410
 411   *ph = 0;
 412   xfree (tmp);
 413   return help;
 414 }
 415
 416 void
 417 free_key (void *data)
 418 {
 419   xfree (data);
 420 }
 421
 422 gpg_error_t
 423 create_thread (void *(*cb) (void *), void *data,
 424                pthread_t * tid, int detached)
 425 {
 426   pthread_attr_t attr;
 427   int n;
 428
 429   pthread_attr_init (&attr);
 430
 431   if (detached)
 432     pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
 433
 434   n = pthread_create (tid, &attr, cb, data);
 435   pthread_attr_destroy (&attr);
 436   return gpg_error_from_errno (n);
 437 }
 438
 439 void
 440 cleanup_mutex_cb (void *arg)
 441 {
 442   pthread_mutex_t *m = (pthread_mutex_t *) arg;
 443
 444   MUTEX_UNLOCK (m);
 445 }
 446
 447 void
 448 cleanup_fd_cb (void *arg)
 449 {
 450   int fd = *(int *) arg;
 451
 452   if (fd != -1)
 453     close (fd);
 454 }
 455
 456 void
 457 cleanup_unlink_cb (void *arg)
 458 {
 459   char *file = arg;
 460
 461   if (file && *file)
 462     unlink (file);
 463 }
 464
 465 void
 466 cleanup_cache_mutex (void *arg)
 467 {
 468   cache_unlock ();
 469 }
 470
 471 int
 472 valid_keygrip (const unsigned char *data, size_t len)
 473 {
 474   for (size_t i = 0; i < len; i++)
 475     {
 476       if (data[i])
 477         return 1;
 478     }
 479
 480   return 0;
 481 }
 482
 483 gpg_error_t
 484 get_checksum (const char *filename, unsigned char **r_crc, size_t * r_crclen)
 485 {
 486   int fd;
 487   unsigned char *buf;
 488   gpg_error_t rc = 0;
 489   size_t len;
 490   struct stat st;
 491
 492   if (stat (filename, &st) == -1)
 493     return gpg_error_from_errno (errno);
 494
 495   fd = open (filename, O_RDONLY);
 496   if (fd == -1)
 497     return gpg_error_from_errno (errno);
 498
 499   pthread_cleanup_push (cleanup_fd_cb, &fd);
 500   buf = xmalloc (st.st_size);
 501   if (buf)
 502     {
 503       pthread_cleanup_push (xfree, buf);
 504
 505       len = read (fd, buf, st.st_size);
 506       if (len == st.st_size)
 507         {
 508           if (buf)
 509             {
 510               unsigned char *crc;
 511
 512               len = gcry_md_get_algo_dlen (GCRY_MD_CRC32);
 513               crc = xmalloc (len);
 514               if (crc)
 515                 {
 516                   pthread_cleanup_push (xfree, crc);
 517                   gcry_md_hash_buffer (GCRY_MD_CRC32, crc, buf, st.st_size);
 518                   *r_crc = crc;
 519                   *r_crclen = len;
 520                   pthread_cleanup_pop (0);
 521                 }
 522               else
 523                 rc = GPG_ERR_ENOMEM;
 524             }
 525         }
 526       else
 527         rc = GPG_ERR_TOO_SHORT;
 528
 529       pthread_cleanup_pop (1);
 530     }
 531   else
 532     rc = GPG_ERR_ENOMEM;
 533
 534   pthread_cleanup_pop (1);
 535   return rc;
 536 }