libopkg/file_util.c

   1 /* file_util.c - convenience routines for common stat operations
   2
   3    Copyright (C) 2009 Ubiq Technologies <graham.gower@gmail.com>
   4
   5    Carl D. Worth
   6    Copyright (C) 2001 University of Southern California
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17 */
  18
  19 #include "config.h"
  20
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <dirent.h>
  25 #include <unistd.h>
  26 #include <ctype.h>
  27
  28 #include "sprintf_alloc.h"
  29 #include "file_util.h"
  30 #ifdef HAVE_MD5
  31 #include "md5.h"
  32 #endif
  33 #include "libbb/libbb.h"
  34
  35 #if defined HAVE_SHA256
  36 #include "sha256.h"
  37 #endif
  38
  39 int file_exists(const char *file_name)
  40 {
  41         struct stat st;
  42
  43         if (stat(file_name, &st) == -1)
  44                 return 0;
  45
  46         return 1;
  47 }
  48
  49 int file_is_dir(const char *file_name)
  50 {
  51         struct stat st;
  52
  53         if (stat(file_name, &st) == -1)
  54                 return 0;
  55
  56         return S_ISDIR(st.st_mode);
  57 }
  58
  59 /* read a single line from a file, stopping at a newline or EOF.
  60    If a newline is read, it will appear in the resulting string.
  61    Return value is a malloc'ed char * which should be freed at
  62    some point by the caller.
  63
  64    Return value is NULL if the file is at EOF when called.
  65 */
  66 char *file_read_line_alloc(FILE * fp)
  67 {
  68         char buf[BUFSIZ];
  69         unsigned int buf_len;
  70         char *line = NULL;
  71         unsigned int line_size = 0;
  72         int got_nl = 0;
  73
  74         buf[0] = '\0';
  75
  76         while (fgets(buf, BUFSIZ, fp)) {
  77                 buf_len = strlen(buf);
  78                 if (buf[buf_len - 1] == '\n') {
  79                         buf_len--;
  80                         buf[buf_len] = '\0';
  81                         got_nl = 1;
  82                 }
  83                 if (line) {
  84                         line_size += buf_len;
  85                         line = xrealloc(line, line_size + 1);
  86                         strncat(line, buf, line_size);
  87                 } else {
  88                         line_size = buf_len + 1;
  89                         line = xstrdup(buf);
  90                 }
  91                 if (got_nl)
  92                         break;
  93         }
  94
  95         return line;
  96 }
  97
  98 int file_move(const char *src, const char *dest)
  99 {
 100         int err;
 101
 102         err = rename(src, dest);
 103         if (err == -1) {
 104                 if (errno == EXDEV) {
 105                         /* src & dest live on different file systems */
 106                         err = file_copy(src, dest);
 107                         if (err == 0)
 108                                 unlink(src);
 109                 } else {
 110                         opkg_perror(ERROR, "Failed to rename %s to %s",
 111                                     src, dest);
 112                 }
 113         }
 114
 115         return err;
 116 }
 117
 118 int file_copy(const char *src, const char *dest)
 119 {
 120         int err;
 121
 122         err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
 123         if (err)
 124                 opkg_msg(ERROR, "Failed to copy file %s to %s.\n", src, dest);
 125
 126         return err;
 127 }
 128
 129 int file_mkdir_hier(const char *path, long mode)
 130 {
 131         return make_directory(path, mode, FILEUTILS_RECUR);
 132 }
 133
 134 #ifdef HAVE_MD5
 135 char *file_md5sum_alloc(const char *file_name)
 136 {
 137         static const int md5sum_bin_len = 16;
 138         static const int md5sum_hex_len = 32;
 139
 140         static const unsigned char bin2hex[16] = {
 141                 '0', '1', '2', '3',
 142                 '4', '5', '6', '7',
 143                 '8', '9', 'a', 'b',
 144                 'c', 'd', 'e', 'f'
 145         };
 146
 147         int i, err;
 148         FILE *file;
 149         char *md5sum_hex;
 150         unsigned char md5sum_bin[md5sum_bin_len];
 151
 152         md5sum_hex = xcalloc(1, md5sum_hex_len + 1);
 153
 154         file = fopen(file_name, "r");
 155         if (file == NULL) {
 156                 opkg_perror(ERROR, "Failed to open file %s", file_name);
 157                 free(md5sum_hex);
 158                 return NULL;
 159         }
 160
 161         err = md5_stream(file, md5sum_bin);
 162         if (err) {
 163                 opkg_msg(ERROR, "Could't compute md5sum for %s.\n", file_name);
 164                 fclose(file);
 165                 free(md5sum_hex);
 166                 return NULL;
 167         }
 168
 169         fclose(file);
 170
 171         for (i = 0; i < md5sum_bin_len; i++) {
 172                 md5sum_hex[i * 2] = bin2hex[md5sum_bin[i] >> 4];
 173                 md5sum_hex[i * 2 + 1] = bin2hex[md5sum_bin[i] & 0xf];
 174         }
 175
 176         md5sum_hex[md5sum_hex_len] = '\0';
 177
 178         return md5sum_hex;
 179 }
 180 #endif
 181
 182 #ifdef HAVE_SHA256
 183 char *file_sha256sum_alloc(const char *file_name)
 184 {
 185         static const int sha256sum_bin_len = 32;
 186         static const int sha256sum_hex_len = 64;
 187
 188         static const unsigned char bin2hex[16] = {
 189                 '0', '1', '2', '3',
 190                 '4', '5', '6', '7',
 191                 '8', '9', 'a', 'b',
 192                 'c', 'd', 'e', 'f'
 193         };
 194
 195         int i, err;
 196         FILE *file;
 197         char *sha256sum_hex;
 198         unsigned char sha256sum_bin[sha256sum_bin_len];
 199
 200         sha256sum_hex = xcalloc(1, sha256sum_hex_len + 1);
 201
 202         file = fopen(file_name, "r");
 203         if (file == NULL) {
 204                 opkg_perror(ERROR, "Failed to open file %s", file_name);
 205                 free(sha256sum_hex);
 206                 return NULL;
 207         }
 208
 209         err = sha256_stream(file, sha256sum_bin);
 210         if (err) {
 211                 opkg_msg(ERROR, "Could't compute sha256sum for %s.\n",
 212                          file_name);
 213                 fclose(file);
 214                 free(sha256sum_hex);
 215                 return NULL;
 216         }
 217
 218         fclose(file);
 219
 220         for (i = 0; i < sha256sum_bin_len; i++) {
 221                 sha256sum_hex[i * 2] = bin2hex[sha256sum_bin[i] >> 4];
 222                 sha256sum_hex[i * 2 + 1] = bin2hex[sha256sum_bin[i] & 0xf];
 223         }
 224
 225         sha256sum_hex[sha256sum_hex_len] = '\0';
 226
 227         return sha256sum_hex;
 228 }
 229
 230 #endif
 231
 232 char *checksum_bin2hex(const char *src, size_t len)
 233 {
 234         char *p;
 235         static char buf[65];
 236         static const unsigned char bin2hex[16] = {
 237                 '0', '1', '2', '3',
 238                 '4', '5', '6', '7',
 239                 '8', '9', 'a', 'b',
 240                 'c', 'd', 'e', 'f'
 241         };
 242
 243         if (len > 32)
 244                 return NULL;
 245
 246         for (p = buf; len > 0; src++, len--) {
 247                 *p++ = bin2hex[*src / 16];
 248                 *p++ = bin2hex[*src % 16];
 249         }
 250
 251         *p = 0;
 252
 253         return buf;
 254 }
 255
 256 char *checksum_hex2bin(const char *src, size_t *len)
 257 {
 258         char *p;
 259         size_t slen;
 260         static char buf[32];
 261
 262         while (isspace(*src))
 263                 src++;
 264
 265         slen = strlen(src);
 266
 267         if (slen > 64) {
 268                 *len = 0;
 269                 return NULL;
 270         }
 271
 272 #define hex(c) \
 273         (c >= 'a' ? (c - 'a') : (c >= 'A' ? (c - 'A') : (c - '0')))
 274
 275         for (p = buf, *len = 0;
 276              slen > 0 && isxdigit(src[0]) && isxdigit(src[1]);
 277              slen--, src += 2, (*len)++)
 278                 *p++ = hex(src[0]) * 16 + hex(src[1]);
 279
 280         return buf;
 281 }
 282
 283 int rm_r(const char *path)
 284 {
 285         int ret = 0;
 286         DIR *dir;
 287         struct dirent *dent;
 288
 289         if (path == NULL) {
 290                 opkg_perror(ERROR, "Missing directory parameter");
 291                 return -1;
 292         }
 293
 294         dir = opendir(path);
 295         if (dir == NULL) {
 296                 opkg_perror(ERROR, "Failed to open dir %s", path);
 297                 return -1;
 298         }
 299
 300         if (fchdir(dirfd(dir)) == -1) {
 301                 opkg_perror(ERROR, "Failed to change to dir %s", path);
 302                 closedir(dir);
 303                 return -1;
 304         }
 305
 306         while (1) {
 307                 errno = 0;
 308                 if ((dent = readdir(dir)) == NULL) {
 309                         if (errno) {
 310                                 opkg_perror(ERROR, "Failed to read dir %s",
 311                                             path);
 312                                 ret = -1;
 313                         }
 314                         break;
 315                 }
 316
 317                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 318                         continue;
 319
 320 #ifdef _BSD_SOURCE
 321                 if (dent->d_type == DT_DIR) {
 322                         if ((ret = rm_r(dent->d_name)) == -1)
 323                                 break;
 324                         continue;
 325                 } else if (dent->d_type == DT_UNKNOWN)
 326 #endif
 327                 {
 328                         struct stat st;
 329                         if ((ret = lstat(dent->d_name, &st)) == -1) {
 330                                 opkg_perror(ERROR, "Failed to lstat %s",
 331                                             dent->d_name);
 332                                 break;
 333                         }
 334                         if (S_ISDIR(st.st_mode)) {
 335                                 if ((ret = rm_r(dent->d_name)) == -1)
 336                                         break;
 337                                 continue;
 338                         }
 339                 }
 340
 341                 if ((ret = unlink(dent->d_name)) == -1) {
 342                         opkg_perror(ERROR, "Failed to unlink %s", dent->d_name);
 343                         break;
 344                 }
 345         }
 346
 347         if (chdir("..") == -1) {
 348                 ret = -1;
 349                 opkg_perror(ERROR, "Failed to change to dir %s/..", path);
 350         }
 351
 352         if (rmdir(path) == -1) {
 353                 ret = -1;
 354                 opkg_perror(ERROR, "Failed to remove dir %s", path);
 355         }
 356
 357         if (closedir(dir) == -1) {
 358                 ret = -1;
 359                 opkg_perror(ERROR, "Failed to close dir %s", path);
 360         }
 361
 362         return ret;
 363 }