diff options
Diffstat (limited to 'mount/realpath.c')
-rw-r--r-- | mount/realpath.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/mount/realpath.c b/mount/realpath.c deleted file mode 100644 index 9b46951b5..000000000 --- a/mount/realpath.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * realpath.c -- canonicalize pathname by removing symlinks - * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Library Public License as published by - * the Free Software Foundation; either version 2, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Library Public License for more details. - */ - -#define resolve_symlinks - -/* - * This routine is part of libc. We include it nevertheless, - * since the libc version has some security flaws. - */ -#include <unistd.h> -#include <string.h> -#include <errno.h> -#include "realpath.h" -#include "sundries.h" /* for xstrdup */ - -#ifndef MAXSYMLINKS -# define MAXSYMLINKS 256 -#endif - -int -is_pseudo_fs(const char *type) -{ - if (type == NULL || *type == '/') - return 0; - if (streq(type, "none") || - streq(type, "proc") || - streq(type, "tmpfs") || - streq(type, "sysfs") || - streq(type, "devpts")) - return 1; - return 0; -} - -/* Make a canonical pathname from PATH. Returns a freshly malloced string. - It is up the *caller* to ensure that the PATH is sensible. i.e. - canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.'' - is not a legal pathname for ``/dev/fd0''. Anything we cannot parse - we return unmodified. */ -char * -canonicalize_spec (const char *path) -{ - if (path == NULL) - return NULL; - if (is_pseudo_fs(path)) - return xstrdup(path); - return canonicalize(path); -} - -char * -canonicalize (const char *path) { - char canonical[PATH_MAX+2]; - - if (path == NULL) - return NULL; - - if (myrealpath (path, canonical, PATH_MAX+1)) - return xstrdup(canonical); - - return xstrdup(path); -} - -char * -myrealpath(const char *path, char *resolved_path, int maxreslth) { - int readlinks = 0; - char *npath; - char link_path[PATH_MAX+1]; - int n; - char *buf = NULL; - - npath = resolved_path; - - /* If it's a relative pathname use getcwd for starters. */ - if (*path != '/') { - if (!getcwd(npath, maxreslth-2)) - return NULL; - npath += strlen(npath); - if (npath[-1] != '/') - *npath++ = '/'; - } else { - *npath++ = '/'; - path++; - } - - /* Expand each slash-separated pathname component. */ - while (*path != '\0') { - /* Ignore stray "/" */ - if (*path == '/') { - path++; - continue; - } - if (*path == '.' && (path[1] == '\0' || path[1] == '/')) { - /* Ignore "." */ - path++; - continue; - } - if (*path == '.' && path[1] == '.' && - (path[2] == '\0' || path[2] == '/')) { - /* Backup for ".." */ - path += 2; - while (npath > resolved_path+1 && - (--npath)[-1] != '/') - ; - continue; - } - /* Safely copy the next pathname component. */ - while (*path != '\0' && *path != '/') { - if (npath-resolved_path > maxreslth-2) { - errno = ENAMETOOLONG; - goto err; - } - *npath++ = *path++; - } - - /* Protect against infinite loops. */ - if (readlinks++ > MAXSYMLINKS) { - errno = ELOOP; - goto err; - } - - /* See if last pathname component is a symlink. */ - *npath = '\0'; - n = readlink(resolved_path, link_path, PATH_MAX); - if (n < 0) { - /* EINVAL means the file exists but isn't a symlink. */ - if (errno != EINVAL) - goto err; - } else { -#ifdef resolve_symlinks /* Richard Gooch dislikes sl resolution */ - int m; - char *newbuf; - - /* Note: readlink doesn't add the null byte. */ - link_path[n] = '\0'; - if (*link_path == '/') - /* Start over for an absolute symlink. */ - npath = resolved_path; - else - /* Otherwise back up over this component. */ - while (*(--npath) != '/') - ; - - /* Insert symlink contents into path. */ - m = strlen(path); - newbuf = xmalloc(m + n + 1); - memcpy(newbuf, link_path, n); - memcpy(newbuf + n, path, m + 1); - free(buf); - path = buf = newbuf; -#endif - } - *npath++ = '/'; - } - /* Delete trailing slash but don't whomp a lone slash. */ - if (npath != resolved_path+1 && npath[-1] == '/') - npath--; - /* Make sure it's null terminated. */ - *npath = '\0'; - - free(buf); - return resolved_path; - - err: - free(buf); - return NULL; -} |