1 files changed, 234 insertions, 0 deletions

diff --git a/src/regress/lib/libc/sys/t_link.c b/src/regress/lib/libc/sys/t_link.c
new file mode 100644
index 0000000000..291fd9cda4
--- /dev/null
+++ b/src/regress/lib/libc/sys/t_link.c
@@ -0,0 +1,234 @@
+/*      $OpenBSD: t_link.c,v 1.1.1.1 2019/11/19 19:57:03 bluhm Exp $    */
+/* $NetBSD: t_link.c,v 1.3 2017/01/13 20:42:36 christos Exp $ */
+
+/*-
+ * Copyright (c) 2011 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jukka Ruohonen.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "macros.h"
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: t_link.c,v 1.3 2017/01/13 20:42:36 christos Exp $");
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include "atf-c.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+static const char       *getpath(void);
+static char              path[] = "link";
+static const char       *pathl;
+
+static const char *
+getpath(void)
+{
+        static char buf[LINE_MAX];
+
+        (void)memset(buf, '\0', sizeof(buf));
+
+        if (getcwd(buf, sizeof(buf)) == NULL)
+                return NULL;
+
+        (void)strlcat(buf, path, sizeof(buf));
+        (void)strlcat(buf, ".link", sizeof(buf));
+
+        return buf;
+}
+
+ATF_TC_WITH_CLEANUP(link_count);
+ATF_TC_HEAD(link_count, tc)
+{
+        atf_tc_set_md_var(tc, "descr", "link(2) counts are incremented?");
+}
+
+ATF_TC_BODY(link_count, tc)
+{
+        struct stat sa, sb;
+        int fd;
+
+        (void)memset(&sa, 0, sizeof(struct stat));
+        (void)memset(&sb, 0, sizeof(struct stat));
+
+        pathl = getpath();
+        fd = open(path, O_RDWR | O_CREAT, 0600);
+
+        ATF_REQUIRE(fd >= 0);
+        ATF_REQUIRE(pathl != NULL);
+
+        ATF_REQUIRE(stat(path, &sa) == 0);
+        ATF_REQUIRE(link(path, pathl) == 0);
+        ATF_REQUIRE(stat(path, &sb) == 0);
+
+        if (sa.st_nlink != sb.st_nlink - 1)
+                atf_tc_fail("incorrect link(2) count");
+
+        ATF_REQUIRE(close(fd) == 0);
+        ATF_REQUIRE(unlink(path) == 0);
+        ATF_REQUIRE(unlink(pathl) == 0);
+}
+
+ATF_TC_CLEANUP(link_count, tc)
+{
+        (void)unlink(path);
+        (void)unlink(pathl);
+}
+
+ATF_TC_WITH_CLEANUP(link_err);
+ATF_TC_HEAD(link_err, tc)
+{
+        atf_tc_set_md_var(tc, "descr", "Test error conditions of link(2)");
+}
+
+ATF_TC_BODY(link_err, tc)
+{
+        char buf[MAXPATHLEN + 1];
+        int fd;
+
+        (void)memset(buf, 'x', sizeof(buf));
+
+        pathl = getpath();
+        fd = open(path, O_RDWR | O_CREAT, 0600);
+
+        ATF_REQUIRE(fd >= 0);
+        ATF_REQUIRE(pathl != NULL);
+
+        errno = 0;
+        ATF_REQUIRE(link(path, pathl) == 0);
+        ATF_REQUIRE_ERRNO(EEXIST, link(path, pathl) == -1);
+
+        errno = 0;
+        ATF_REQUIRE_ERRNO(ENAMETOOLONG, link(buf, "xxx") == -1);
+
+        errno = 0;
+        ATF_REQUIRE_ERRNO(ENOENT, link(path, "/d/c/b/a") == -1);
+
+        errno = 0;
+        ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", path) == -1);
+
+        errno = 0;
+        ATF_REQUIRE_ERRNO(ENOENT, link("/a/b/c/d", "/d/c/b/a") == -1);
+
+        errno = 0;
+        ATF_REQUIRE_ERRNO(EFAULT, link(path, (const char *)-1) == -1);
+
+        errno = 0;
+        ATF_REQUIRE_ERRNO(EFAULT, link((const char *)-1, "xxx") == -1);
+
+        ATF_REQUIRE(close(fd) == 0);
+        ATF_REQUIRE(unlink(path) == 0);
+        ATF_REQUIRE(unlink(pathl) == 0);
+}
+
+ATF_TC_CLEANUP(link_err, tc)
+{
+        (void)unlink(path);
+        (void)unlink(pathl);
+}
+
+ATF_TC(link_perm);
+ATF_TC_HEAD(link_perm, tc)
+{
+        atf_tc_set_md_var(tc, "descr", "Test permissions with link(2)");
+        atf_tc_set_md_var(tc, "require.user", "unprivileged");
+}
+
+ATF_TC_BODY(link_perm, tc)
+{
+        int rv;
+
+        errno = 0;
+        rv = link("/root", "/root.link");
+        ATF_REQUIRE_MSG(rv == -1 && (errno == EACCES || errno == EPERM),
+            "link to a directory did not fail with EPERM or EACCESS; link() "
+            "returned %d, errno %d", rv, errno);
+
+        errno = 0;
+        ATF_REQUIRE_ERRNO(EACCES,
+            link("/root/.profile", "/root/.profile.link") == -1);
+}
+
+ATF_TC_WITH_CLEANUP(link_stat);
+ATF_TC_HEAD(link_stat, tc)
+{
+        atf_tc_set_md_var(tc, "descr", "Check stat(2) of a linked file");
+}
+
+ATF_TC_BODY(link_stat, tc)
+{
+        struct stat sa, sb;
+        int fd;
+
+        (void)memset(&sa, 0, sizeof(struct stat));
+        (void)memset(&sb, 0, sizeof(struct stat));
+
+        pathl = getpath();
+        fd = open(path, O_RDWR | O_CREAT, 0600);
+
+        ATF_REQUIRE(fd >= 0);
+        ATF_REQUIRE(pathl != NULL);
+
+        ATF_REQUIRE(link(path, pathl) == 0);
+        ATF_REQUIRE(stat(path, &sa) == 0);
+        ATF_REQUIRE(lstat(pathl, &sb) == 0);
+
+        if (sa.st_uid != sb.st_uid)
+                atf_tc_fail("unequal UIDs");
+
+        if (sa.st_mode != sb.st_mode)
+                atf_tc_fail("unequal modes");
+
+        if (sa.st_ino != sb.st_ino)
+                atf_tc_fail("unequal inodes");
+
+        ATF_REQUIRE(close(fd) == 0);
+        ATF_REQUIRE(unlink(path) == 0);
+        ATF_REQUIRE(unlink(pathl) == 0);
+}
+
+ATF_TC_CLEANUP(link_stat, tc)
+{
+        (void)unlink(path);
+        (void)unlink(pathl);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+        ATF_TP_ADD_TC(tp, link_count);
+        ATF_TP_ADD_TC(tp, link_err);
+        ATF_TP_ADD_TC(tp, link_perm);
+        ATF_TP_ADD_TC(tp, link_stat);
+
+        return atf_no_error();
+}