Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 173 insertions, 0 deletions

diff --git a/src/util/make_dirs.c b/src/util/make_dirs.c
new file mode 100644
index 0000000..2e37f8f
--- /dev/null
+++ b/src/util/make_dirs.c
@@ -0,0 +1,173 @@
+/*++
+/* NAME
+/*	make_dirs 3
+/* SUMMARY
+/*	create directory hierarchy
+/* SYNOPSIS
+/*	#include <make_dirs.h>
+/*
+/*	int	make_dirs(path, perms)
+/*	const char *path;
+/*	int	perms;
+/* DESCRIPTION
+/*	make_dirs() creates the directory specified in \fIpath\fR, and
+/*	creates any missing intermediate directories as well. Directories
+/*	are created with the permissions specified in \fIperms\fR, as
+/*	modified by the process umask.
+/* DIAGNOSTICS:
+/*	Fatal: out of memory. make_dirs() returns 0 in case of success.
+/*	In case of problems. make_dirs() returns -1 and \fIerrno\fR
+/*	reflects the nature of the problem.
+/* SEE ALSO
+/*	mkdir(2)
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "mymalloc.h"
+#include "stringops.h"
+#include "make_dirs.h"
+#include "warn_stat.h"
+
+/* make_dirs - create directory hierarchy */
+
+int     make_dirs(const char *path, int perms)
+{
+    const char *myname = "make_dirs";
+    char   *saved_path;
+    unsigned char *cp;
+    int     saved_ch;
+    struct stat st;
+    int     ret;
+    mode_t  saved_mode = 0;
+    gid_t   egid = -1;
+
+    /*
+     * Initialize. Make a copy of the path that we can safely clobber.
+     */
+    cp = (unsigned char *) (saved_path = mystrdup(path));
+
+    /*
+     * I didn't like the 4.4BSD "mkdir -p" implementation, but coming up with
+     * my own took a day, spread out over several days.
+     */
+#define SKIP_WHILE(cond, ptr) { while(*ptr && (cond)) ptr++; }
+
+    SKIP_WHILE(*cp == '/', cp);
+
+    for (;;) {
+	SKIP_WHILE(*cp != '/', cp);
+	if ((saved_ch = *cp) != 0)
+	    *cp = 0;
+	if ((ret = stat(saved_path, &st)) >= 0) {
+	    if (!S_ISDIR(st.st_mode)) {
+		errno = ENOTDIR;
+		ret = -1;
+		break;
+	    }
+	    saved_mode = st.st_mode;
+	} else {
+	    if (errno != ENOENT)
+		break;
+
+	    /*
+	     * mkdir(foo) fails with EEXIST if foo is a symlink.
+	     */
+#if 0
+
+	    /*
+	     * Create a new directory. Unfortunately, mkdir(2) has no
+	     * equivalent of open(2)'s O_CREAT|O_EXCL safety net, so we must
+	     * require that the parent directory is not world writable.
+	     * Detecting a lost race condition after the fact is not
+	     * sufficient, as an attacker could repeat the attack and add one
+	     * directory level at a time.
+	     */
+	    if (saved_mode & S_IWOTH) {
+		msg_warn("refusing to mkdir %s: parent directory is writable by everyone",
+			 saved_path);
+		errno = EPERM;
+		ret = -1;
+		break;
+	    }
+#endif
+	    if ((ret = mkdir(saved_path, perms)) < 0) {
+		if (errno != EEXIST)
+		    break;
+		/* Race condition? */
+		if ((ret = stat(saved_path, &st)) < 0)
+		    break;
+		if (!S_ISDIR(st.st_mode)) {
+		    errno = ENOTDIR;
+		    ret = -1;
+		    break;
+		}
+	    }
+
+	    /*
+	     * Fix directory ownership when mkdir() ignores the effective
+	     * GID. Don't change the effective UID for doing this.
+	     */
+	    if ((ret = stat(saved_path, &st)) < 0) {
+		msg_warn("%s: stat %s: %m", myname, saved_path);
+		break;
+	    }
+	    if (egid == -1)
+		egid = getegid();
+	    if (st.st_gid != egid && (ret = chown(saved_path, -1, egid)) < 0) {
+		msg_warn("%s: chgrp %s: %m", myname, saved_path);
+		break;
+	    }
+	}
+	if (saved_ch != 0)
+	    *cp = saved_ch;
+	SKIP_WHILE(*cp == '/', cp);
+	if (*cp == 0)
+	    break;
+    }
+
+    /*
+     * Cleanup.
+     */
+    myfree(saved_path);
+    return (ret);
+}
+
+#ifdef TEST
+
+ /*
+  * Test program. Usage: make_dirs path...
+  */
+#include <stdlib.h>
+#include <msg_vstream.h>
+
+int     main(int argc, char **argv)
+{
+    msg_vstream_init(argv[0], VSTREAM_ERR);
+    if (argc < 2)
+	msg_fatal("usage: %s path...", argv[0]);
+    while (--argc > 0 && *++argv != 0)
+	if (make_dirs(*argv, 0755))
+	    msg_fatal("%s: %m", *argv);
+    exit(0);
+}
+
+#endif