libopkg/file_util.c

   1 /* file_util.c - convenience routines for common stat operations
   2
   3    Carl D. Worth
   4
   5    Copyright (C) 2001 University of Southern California
   6
   7    This program is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License as
   9    published by the Free Software Foundation; either version 2, or (at
  10    your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16 */
  17
  18 #include "includes.h"
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <dirent.h>
  22
  23 #include "sprintf_alloc.h"
  24 #include "file_util.h"
  25 #include "md5.h"
  26 #include "libbb/libbb.h"
  27 #undef strlen
  28
  29 #if defined HAVE_SHA256
  30 #include "sha256.h"
  31 #endif
  32
  33 int file_exists(const char *file_name)
  34 {
  35     int err;
  36     struct stat stat_buf;
  37
  38     err = stat(file_name, &stat_buf);
  39     if (err == 0) {
  40         return 1;
  41     } else {
  42         return 0;
  43     }
  44 }
  45
  46 int file_is_dir(const char *file_name)
  47 {
  48     int err;
  49     struct stat stat_buf;
  50
  51     err = stat(file_name, &stat_buf);
  52     if (err) {
  53         return 0;
  54     }
  55
  56     return S_ISDIR(stat_buf.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 #define FILE_READ_LINE_BUF_SIZE 1024
  67 char *file_read_line_alloc(FILE *file)
  68 {
  69     char buf[FILE_READ_LINE_BUF_SIZE];
  70     int buf_len;
  71     char *line = NULL;
  72     int line_size = 0;
  73
  74     memset(buf, 0, FILE_READ_LINE_BUF_SIZE);
  75     while (fgets(buf, FILE_READ_LINE_BUF_SIZE, file)) {
  76         buf_len = strlen(buf);
  77         if (line) {
  78             line_size += buf_len;
  79             line = xrealloc(line, line_size);
  80             strcat(line, buf);
  81         } else {
  82             line_size = buf_len + 1;
  83             line = xstrdup(buf);
  84         }
  85         if (buf[buf_len - 1] == '\n') {
  86             break;
  87         }
  88     }
  89
  90     return line;
  91 }
  92
  93 int file_move(const char *src, const char *dest)
  94 {
  95     int err;
  96
  97     err = rename(src, dest);
  98
  99     if (err && errno == EXDEV) {
 100         err = file_copy(src, dest);
 101         unlink(src);
 102     } else if (err) {
 103         fprintf(stderr, "%s: ERROR: failed to rename %s to %s: %s\n",
 104                 __FUNCTION__, src, dest, strerror(errno));
 105     }
 106
 107     return err;
 108 }
 109
 110 /* I put these here to keep libbb dependencies from creeping all over
 111    the opkg code */
 112 int file_copy(const char *src, const char *dest)
 113 {
 114     int err;
 115
 116     err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
 117     if (err) {
 118         fprintf(stderr, "%s: ERROR: failed to copy %s to %s\n",
 119                 __FUNCTION__, src, dest);
 120     }
 121
 122     return err;
 123 }
 124
 125 int file_mkdir_hier(const char *path, long mode)
 126 {
 127     return make_directory(path, mode, FILEUTILS_RECUR);
 128 }
 129
 130 char *file_md5sum_alloc(const char *file_name)
 131 {
 132     static const int md5sum_bin_len = 16;
 133     static const int md5sum_hex_len = 32;
 134
 135     static const unsigned char bin2hex[16] = {
 136         '0', '1', '2', '3',
 137         '4', '5', '6', '7',
 138         '8', '9', 'a', 'b',
 139         'c', 'd', 'e', 'f'
 140     };
 141
 142     int i, err;
 143     FILE *file;
 144     char *md5sum_hex;
 145     unsigned char md5sum_bin[md5sum_bin_len];
 146
 147     md5sum_hex = xcalloc(1, md5sum_hex_len + 1);
 148
 149     file = fopen(file_name, "r");
 150     if (file == NULL) {
 151         fprintf(stderr, "%s: Failed to open file %s: %s\n",
 152                 __FUNCTION__, file_name, strerror(errno));
 153         free(md5sum_hex);
 154         return NULL;
 155     }
 156
 157     err = md5_stream(file, md5sum_bin);
 158     if (err) {
 159         fprintf(stderr, "%s: ERROR computing md5sum for %s: %s\n",
 160                 __FUNCTION__, file_name, strerror(err));
 161         fclose(file);
 162         free(md5sum_hex);
 163         return NULL;
 164     }
 165
 166     fclose(file);
 167
 168     for (i=0; i < md5sum_bin_len; i++) {
 169         md5sum_hex[i*2] = bin2hex[md5sum_bin[i] >> 4];
 170         md5sum_hex[i*2+1] = bin2hex[md5sum_bin[i] & 0xf];
 171     }
 172
 173     md5sum_hex[md5sum_hex_len] = '\0';
 174
 175     return md5sum_hex;
 176 }
 177
 178 #ifdef HAVE_SHA256
 179 char *file_sha256sum_alloc(const char *file_name)
 180 {
 181     static const int sha256sum_bin_len = 32;
 182     static const int sha256sum_hex_len = 64;
 183
 184     static const unsigned char bin2hex[16] = {
 185         '0', '1', '2', '3',
 186         '4', '5', '6', '7',
 187         '8', '9', 'a', 'b',
 188         'c', 'd', 'e', 'f'
 189     };
 190
 191     int i, err;
 192     FILE *file;
 193     char *sha256sum_hex;
 194     unsigned char sha256sum_bin[sha256sum_bin_len];
 195
 196     sha256sum_hex = xcalloc(1, sha256sum_hex_len + 1);
 197
 198     file = fopen(file_name, "r");
 199     if (file == NULL) {
 200         fprintf(stderr, "%s: Failed to open file %s: %s\n",
 201                 __FUNCTION__, file_name, strerror(errno));
 202         free(sha256sum_hex);
 203         return NULL;
 204     }
 205
 206     err = sha256_stream(file, sha256sum_bin);
 207     if (err) {
 208         fprintf(stderr, "%s: ERROR computing sha256sum for %s: %s\n",
 209                 __FUNCTION__, file_name, strerror(err));
 210         fclose(file);
 211         free(sha256sum_hex);
 212         return NULL;
 213     }
 214
 215     fclose(file);
 216
 217     for (i=0; i < sha256sum_bin_len; i++) {
 218         sha256sum_hex[i*2] = bin2hex[sha256sum_bin[i] >> 4];
 219         sha256sum_hex[i*2+1] = bin2hex[sha256sum_bin[i] & 0xf];
 220     }
 221
 222     sha256sum_hex[sha256sum_hex_len] = '\0';
 223
 224     return sha256sum_hex;
 225 }
 226
 227 #endif
 228
 229
 230 int
 231 rm_r(const char *path)
 232 {
 233         int ret = 0;
 234         DIR *dir;
 235         struct dirent *dent;
 236
 237         dir = opendir(path);
 238         if (dir == NULL) {
 239                 perror_msg("%s: opendir(%s)", __FUNCTION__, path);
 240                 return -1;
 241         }
 242
 243         if (fchdir(dirfd(dir)) == -1) {
 244                 perror_msg("%s: fchdir(%s)", __FUNCTION__, path);
 245                 closedir(dir);
 246                 return -1;
 247         }
 248
 249         while (1) {
 250                 errno = 0;
 251                 if ((dent = readdir(dir)) == NULL) {
 252                         if (errno) {
 253                                 perror_msg("%s: readdir(%s)",
 254                                                 __FUNCTION__, path);
 255                                 ret = -1;
 256                         }
 257                         break;
 258                 }
 259
 260                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 261                         continue;
 262
 263 #ifdef _BSD_SOURCE
 264                 if (dent->d_type == DT_DIR) {
 265                         if ((ret = rm_r(dent->d_name)) == -1)
 266                                 break;
 267                         continue;
 268                 } else if (dent->d_type == DT_UNKNOWN)
 269 #endif
 270                 {
 271                         struct stat st;
 272                         if ((ret = lstat(dent->d_name, &st)) == -1) {
 273                                 perror_msg("%s: lstat(%s)",
 274                                                 __FUNCTION__, dent->d_name);
 275                                 break;
 276                         }
 277                         if (S_ISDIR(st.st_mode)) {
 278                                 if ((ret = rm_r(dent->d_name)) == -1)
 279                                         break;
 280                                 continue;
 281                         }
 282                 }
 283
 284                 if ((ret = unlink(dent->d_name)) == -1) {
 285                         perror_msg("%s: unlink(%s)",
 286                                         __FUNCTION__, dent->d_name);
 287                         break;
 288                 }
 289         }
 290
 291         if (chdir("..") == -1) {
 292                 ret = -1;
 293                 perror_msg("%s: chdir(%s/..)", __FUNCTION__, path);
 294         }
 295
 296         if (rmdir(path) == -1 ) {
 297                 ret = -1;
 298                 perror_msg("%s: rmdir(%s)", __FUNCTION__, path);
 299         }
 300
 301         if (closedir(dir) == -1) {
 302                 ret = -1;
 303                 perror_msg("%s: closedir(%s)", __FUNCTION__, path);
 304         }
 305
 306         return ret;
 307 }