Create mux socket for regress in temp directory

In some setups, creating the socket under OBJ may result in a path that
is too long for a Unix domain socket.  Add a helper to let us portably
create a temporary directory instead.

Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=2660
Last-Update: 2017-01-03

Patch-Name: regress-mktemp.patch

4 files changed, 74 insertions, 2 deletions

diff --git a/regress/forwarding.sh b/regress/forwarding.sh
index a1a4b13f2..592de7bc3 100644
--- a/regress/forwarding.sh
+++ b/regress/forwarding.sh
@@ -10,7 +10,8 @@ start_sshd
 base=33
 last=$PORT
 fwd=""
-CTL=$OBJ/ctl-sock
+make_tmpdir
+CTL=$TMP/ctl-sock
 
 for j in 0 1 2; do
         for i in 0 1 2; do
diff --git a/regress/mkdtemp.c b/regress/mkdtemp.c
new file mode 100644
index 000000000..8c7d2e219
--- /dev/null
+++ b/regress/mkdtemp.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2017 Colin Watson <cjwatson@debian.org>
+ *
+ * Permission to use, copy, modify, and 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.
+ */
+
+/* Roughly equivalent to "mktemp -d -t TEMPLATE", but portable. */
+
+#include "includes.h"
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "log.h"
+
+static void
+usage(void)
+{
+        fprintf(stderr, "mkdtemp template\n");
+        exit(1);
+}
+
+int
+main(int argc, char **argv)
+{
+        const char *base;
+        const char *tmpdir;
+        char template[PATH_MAX];
+        int r;
+        char *dir;
+
+        if (argc != 2)
+                usage();
+        base = argv[1];
+
+        if ((tmpdir = getenv("TMPDIR")) == NULL)
+                tmpdir = "/tmp";
+        r = snprintf(template, sizeof(template), "%s/%s", tmpdir, base);
+        if (r < 0 || (size_t)r >= sizeof(template))
+                fatal("template string too long");
+        dir = mkdtemp(template);
+        if (dir == NULL) {
+                perror("mkdtemp");
+                exit(1);
+        }
+        puts(dir);
+        return 0;
+}
diff --git a/regress/multiplex.sh b/regress/multiplex.sh
index acb9234d9..0ac4065e7 100644
--- a/regress/multiplex.sh
+++ b/regress/multiplex.sh
@@ -1,7 +1,8 @@
 #       $OpenBSD: multiplex.sh,v 1.27 2014/12/22 06:14:29 djm Exp $
 #       Placed in the Public Domain.
 
-CTL=/tmp/openssh.regress.ctl-sock.$$
+make_tmpdir
+CTL=$TMP/ctl-sock
 
 tid="connection multiplexing"
 
diff --git a/regress/test-exec.sh b/regress/test-exec.sh
index bfa48803b..13a8e18f3 100644
--- a/regress/test-exec.sh
+++ b/regress/test-exec.sh
@@ -317,6 +317,14 @@ stop_sshd ()
         fi
 }
 
+TMP=
+
+make_tmpdir ()
+{
+        TMP="$($OBJ/mkdtemp openssh-regress-XXXXXXXXXXXX)" || \
+            fatal "failed to create temporary directory"
+}
+
 # helper
 cleanup ()
 {
@@ -327,6 +335,9 @@ cleanup ()
                         kill $SSH_PID
                 fi
         fi
+        if [ "x$TMP" != "x" ]; then
+                rm -rf "$TMP"
+        fi
         stop_sshd
 }