diff options
Diffstat (limited to 'path.c')
| -rw-r--r-- | path.c | 86 |
1 files changed, 77 insertions, 9 deletions
@@ -394,17 +394,38 @@ int set_shared_perm(const char *path, int mode) const char *make_relative_path(const char *abs, const char *base) { static char buf[PATH_MAX + 1]; - int baselen; - if (!base) - return abs; - baselen = strlen(base); - if (prefixcmp(abs, base)) + int i = 0, j = 0; + + if (!base || !base[0]) return abs; - if (abs[baselen] == '/') - baselen++; - else if (base[baselen - 1] != '/') + while (base[i]) { + if (is_dir_sep(base[i])) { + if (!is_dir_sep(abs[j])) + return abs; + while (is_dir_sep(base[i])) + i++; + while (is_dir_sep(abs[j])) + j++; + continue; + } else if (abs[j] != base[i]) { + return abs; + } + i++; + j++; + } + if ( + /* "/foo" is a prefix of "/foo" */ + abs[j] && + /* "/foo" is not a prefix of "/foobar" */ + !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j]) + ) return abs; - strcpy(buf, abs + baselen); + while (is_dir_sep(abs[j])) + j++; + if (!abs[j]) + strcpy(buf, "."); + else + strcpy(buf, abs + j); return buf; } @@ -581,3 +602,50 @@ char *strip_path_suffix(const char *path, const char *suffix) return NULL; return xstrndup(path, chomp_trailing_dir_sep(path, path_len)); } + +int daemon_avoid_alias(const char *p) +{ + int sl, ndot; + + /* + * This resurrects the belts and suspenders paranoia check by HPA + * done in <435560F7.4080006@zytor.com> thread, now enter_repo() + * does not do getcwd() based path canonicalizations. + * + * sl becomes true immediately after seeing '/' and continues to + * be true as long as dots continue after that without intervening + * non-dot character. + */ + if (!p || (*p != '/' && *p != '~')) + return -1; + sl = 1; ndot = 0; + p++; + + while (1) { + char ch = *p++; + if (sl) { + if (ch == '.') + ndot++; + else if (ch == '/') { + if (ndot < 3) + /* reject //, /./ and /../ */ + return -1; + ndot = 0; + } + else if (ch == 0) { + if (0 < ndot && ndot < 3) + /* reject /.$ and /..$ */ + return -1; + return 0; + } + else + sl = ndot = 0; + } + else if (ch == 0) + return 0; + else if (ch == '/') { + sl = 1; + ndot = 0; + } + } +} |