security/coreconf/nsinstall/pathsub.c

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Mozilla Public License Version
   5  * 1.1 (the "License"); you may not use this file except in compliance with
   6  * the License. You may obtain a copy of the License at
   7  * http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS" basis,
  10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11  * for the specific language governing rights and limitations under the
  12  * License.
  13  *
  14  * The Original Code is the Netscape security libraries.
  15  *
  16  * The Initial Developer of the Original Code is
  17  * Netscape Communications Corporation.
  18  * Portions created by the Initial Developer are Copyright (C) 1994-2000
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *
  23  * Alternatively, the contents of this file may be used under the terms of
  24  * either the GNU General Public License Version 2 or later (the "GPL"), or
  25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  26  * in which case the provisions of the GPL or the LGPL are applicable instead
  27  * of those above. If you wish to allow use of your version of this file only
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  32  * the provisions above, a recipient may use your version of this file under
  33  * the terms of any one of the MPL, the GPL or the LGPL.
  34  *
  35  * ***** END LICENSE BLOCK ***** */
  36
  37 /*
  38 ** Pathname subroutines.
  39 */
  40 #include <assert.h>
  41 #if defined(FREEBSD) || defined(BSDI) || defined(DARWIN)
  42 #include <sys/types.h>
  43 #endif /* FREEBSD */
  44 #include <dirent.h>
  45 #include <errno.h>
  46 #include <stdarg.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <sys/types.h>
  52 #include <sys/stat.h>
  53 #include "pathsub.h"
  54 #ifdef USE_REENTRANT_LIBC
  55 #include "libc_r.h"
  56 #endif /* USE_REENTRANT_LIBC */
  57
  58 char *program;
  59
  60 void
  61 fail(char *format, ...)
  62 {
  63     int error;
  64     va_list ap;
  65
  66 #ifdef USE_REENTRANT_LIBC
  67     R_STRERROR_INIT_R();
  68 #endif
  69
  70     error = errno;
  71     fprintf(stderr, "%s: ", program);
  72     va_start(ap, format);
  73     vfprintf(stderr, format, ap);
  74     va_end(ap);
  75     if (error) {
  76
  77 #ifdef USE_REENTRANT_LIBC
  78     R_STRERROR_R(errno);
  79         fprintf(stderr, ": %s", r_strerror_r);
  80 #else
  81         fprintf(stderr, ": %s", strerror(errno));
  82 #endif
  83     }
  84
  85     putc('\n', stderr);
  86     abort();
  87     exit(1);
  88 }
  89
  90 char *
  91 getcomponent(char *path, char *name)
  92 {
  93     if (*path == '\0')
  94         return 0;
  95     if (*path == '/') {
  96         *name++ = '/';
  97     } else {
  98         do {
  99             *name++ = *path++;
 100         } while (*path != '/' && *path != '\0');
 101     }
 102     *name = '\0';
 103     while (*path == '/')
 104         path++;
 105     return path;
 106 }
 107
 108 #ifdef UNIXWARE
 109 /* The static buffer in Unixware's readdir is too small. */
 110 struct dirent * readdir(DIR *d)
 111 {
 112     static struct dirent *buf = NULL;
 113 #define MAX_PATH_LEN 1024
 114
 115     if (buf == NULL)
 116         buf = (struct dirent *)xmalloc(sizeof(struct dirent) + MAX_PATH_LEN) ;
 117     return readdir_r(d, buf);
 118 }
 119 #endif
 120
 121 /* APPARENT BUG - ignores argument "dir", uses ".." instead. */
 122 char *
 123 ino2name(ino_t ino, char *dir)
 124 {
 125     DIR *dp;
 126     struct dirent *ep;
 127     char *name;
 128
 129     dp = opendir("..");         /* XXX */
 130     if (!dp)
 131         fail("cannot read parent directory");
 132     for (;;) {
 133         if (!(ep = readdir(dp)))
 134             fail("cannot find current directory");
 135         if (ep->d_ino == ino)
 136             break;
 137     }
 138     name = xstrdup(ep->d_name);
 139     closedir(dp);
 140     return name;
 141 }
 142
 143 void *
 144 xmalloc(size_t size)
 145 {
 146     void *p;
 147
 148     if (size <= 0)
 149         fail("attempted to allocate %u bytes", size);
 150     p = malloc(size);
 151     if (!p)
 152         fail("cannot allocate %u bytes", size);
 153     return p;
 154 }
 155
 156 char *
 157 xstrdup(char *s)
 158 {
 159     if (!s || !s[0])
 160         fail("Null pointer or empty string passed to xstrdup()");
 161     return strcpy((char*)xmalloc(strlen(s) + 1), s);
 162 }
 163
 164 char *
 165 xbasename(char *path)
 166 {
 167     char *cp;
 168
 169     if (!path || !path[0])
 170         fail("Null pointer or empty string passed to xbasename()");
 171     while ((cp = strrchr(path, '/')) && cp[1] == '\0')
 172         *cp = '\0';
 173     if (!cp) return path;
 174     return cp + 1;
 175 }
 176
 177 void
 178 xchdir(char *dir)
 179 {
 180     if (!dir || !dir[0])
 181         fail("Null pointer or empty string passed to xchdir()");
 182     if (chdir(dir) < 0)
 183         fail("cannot change directory to %s", dir);
 184 }
 185
 186 int
 187 relatepaths(char *from, char *to, char *outpath)
 188 {
 189     char *cp, *cp2;
 190     int len;
 191     char buf[NAME_MAX];
 192
 193     assert(*from == '/' && *to == '/');
 194     if (!from || *from != '/')
 195         fail("relatepaths: from path does not start with /");
 196     if (!to || *to != '/')
 197         fail("relatepaths: to   path does not start with /");
 198
 199     for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
 200         if (*cp == '\0')
 201             break;
 202     while (cp[-1] != '/')
 203         cp--, cp2--;
 204     if (cp - 1 == to) {
 205         /* closest common ancestor is /, so use full pathname */
 206         len = strlen(strcpy(outpath, to));
 207         if (outpath[len] != '/') {
 208             outpath[len++] = '/';
 209             outpath[len] = '\0';
 210         }
 211     } else {
 212         len = 0;
 213         while ((cp2 = getcomponent(cp2, buf)) != 0) {
 214             strcpy(outpath + len, "../");
 215             len += 3;
 216         }
 217         while ((cp = getcomponent(cp, buf)) != 0) {
 218             sprintf(outpath + len, "%s/", buf);
 219             len += strlen(outpath + len);
 220         }
 221     }
 222     return len;
 223 }
 224
 225 void
 226 reversepath(char *inpath, char *name, int len, char *outpath)
 227 {
 228     char *cp, *cp2;
 229     char buf[NAME_MAX];
 230     struct stat sb;
 231
 232     cp = strcpy(outpath + PATH_MAX - (len + 1), name);
 233     cp2 = inpath;
 234     while ((cp2 = getcomponent(cp2, buf)) != 0) {
 235         if (strcmp(buf, ".") == 0)
 236             continue;
 237         if (strcmp(buf, "..") == 0) {
 238             if (stat(".", &sb) < 0)
 239                 fail("cannot stat current directory");
 240             name = ino2name(sb.st_ino, "..");
 241             len = strlen(name);
 242             cp -= len + 1;
 243             strcpy(cp, name);
 244             cp[len] = '/';
 245             free(name);
 246             xchdir("..");
 247         } else {
 248             cp -= 3;
 249             strncpy(cp, "../", 3);
 250             xchdir(buf);
 251         }
 252     }
 253     strcpy(outpath, cp);
 254 }
 255
 256 void
 257 diagnosePath(const char * path)
 258 {
 259     char *      myPath;
 260     char *      slash;
 261     int         rv;
 262     struct stat sb;
 263     char        buf[BUFSIZ];
 264
 265     if (!path || !path[0])
 266         fail("Null pointer or empty string passed to mkdirs()");
 267     myPath = strdup(path);
 268     if (!myPath)
 269         fail("strdup() failed!");
 270     do {
 271         rv = lstat(myPath, &sb);
 272         if (rv < 0) {
 273             perror(myPath);
 274         } else if (S_ISLNK(sb.st_mode)) {
 275             rv = readlink(myPath, buf, sizeof buf);
 276             if (rv < 0) {
 277                 perror("readlink");
 278                 buf[0] = 0;
 279             } else {
 280                 buf[rv] = 0;
 281             }
 282             fprintf(stderr, "%s is a link to %s\n", myPath, buf);
 283         } else if (S_ISDIR(sb.st_mode)) {
 284             fprintf(stderr, "%s is a directory\n", myPath);
 285             rv = access(myPath, X_OK);
 286             if (rv < 0) {
 287                 fprintf(stderr, "%s: no search permission\n", myPath);
 288             }
 289         } else {
 290             fprintf(stderr, "%s is a file !?!\n", myPath);
 291             rv = access(myPath, F_OK);
 292             if (rv < 0) {
 293                 fprintf(stderr, "%s does not exist\n", myPath);
 294             }
 295         }
 296
 297         /* chop path off one level. */
 298         slash = strrchr(myPath, '/');
 299         if (!slash)
 300             slash = strrchr(myPath, '\\');
 301         if (!slash)
 302             slash = myPath;
 303         *slash = 0;
 304     } while (myPath[0]);
 305     free(myPath);
 306 }