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/* $OpenBSD: realpath.c,v 1.26 2019/06/17 03:13:17 deraadt Exp $ */
/*
* Copyright (c) 2019 Bob Beck <beck@openbsd.org>
* Copyright (c) 2019 Theo de Raadt <deraadt@openbsd.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <syslog.h>
#include <stdarg.h>
int __realpath(const char *pathname, char *resolved);
PROTO_NORMAL(__realpath);
/*
* wrapper for kernel __realpath
*/
char *
realpath(const char *path, char *resolved)
{
char rbuf[PATH_MAX];
if (__realpath(path, rbuf) == -1) {
/*
* XXX XXX XXX
*
* The old userland implementation strips trailing slashes.
* According to Dr. POSIX, realpathing "/bsd" should be fine,
* realpathing "/bsd/" should return ENOTDIR.
*
* Similar, but *different* to the above, The old userland
* implementation allows for realpathing "/nonexistent" but
* not "/nonexistent/", Both those should return ENOENT
* according to POSIX.
*
* This hack should go away once we decide to match POSIX.
* which we should as soon as is convenient.
*/
if (errno == ENOTDIR) {
char pbuf[PATH_MAX];
ssize_t i;
if (strlcpy(pbuf, path, sizeof(pbuf)) >= sizeof(pbuf)) {
errno = ENAMETOOLONG;
return NULL;
}
/* Try again without the trailing slashes. */
for (i = strlen(pbuf); i > 1 && pbuf[i - 1] == '/'; i--)
pbuf[i - 1] = '\0';
if (__realpath(pbuf, rbuf) == -1)
return NULL;
} else
return NULL;
}
if (resolved == NULL)
return (strdup(rbuf));
strlcpy(resolved, rbuf, PATH_MAX);
return (resolved);
}
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