Vendor import of OpenSSH.

1 files changed, 66 insertions, 0 deletions

diff --git a/crypto/openssh/tildexpand.c b/crypto/openssh/tildexpand.c
new file mode 100644
index 0000000..4ecb785
--- /dev/null
+++ b/crypto/openssh/tildexpand.c
@@ -0,0 +1,66 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * Created: Wed Jul 12 01:07:36 1995 ylo
+ */
+
+#include "includes.h"
+RCSID("$Id: tildexpand.c,v 1.6 1999/12/06 19:10:38 deraadt Exp $");
+
+#include "xmalloc.h"
+#include "ssh.h"
+
+/*
+ * Expands tildes in the file name.  Returns data allocated by xmalloc.
+ * Warning: this calls getpw*.
+ */
+char *
+tilde_expand_filename(const char *filename, uid_t my_uid)
+{
+	const char *cp;
+	unsigned int userlen;
+	char *expanded;
+	struct passwd *pw;
+	char user[100];
+	int len;
+
+	/* Return immediately if no tilde. */
+	if (filename[0] != '~')
+		return xstrdup(filename);
+
+	/* Skip the tilde. */
+	filename++;
+
+	/* Find where the username ends. */
+	cp = strchr(filename, '/');
+	if (cp)
+		userlen = cp - filename;	/* Something after username. */
+	else
+		userlen = strlen(filename);	/* Nothing after username. */
+	if (userlen == 0)
+		pw = getpwuid(my_uid);		/* Own home directory. */
+	else {
+		/* Tilde refers to someone elses home directory. */
+		if (userlen > sizeof(user) - 1)
+			fatal("User name after tilde too long.");
+		memcpy(user, filename, userlen);
+		user[userlen] = 0;
+		pw = getpwnam(user);
+	}
+	if (!pw)
+		fatal("Unknown user %100s.", user);
+
+	/* If referring to someones home directory, return it now. */
+	if (!cp) {
+		/* Only home directory specified */
+		return xstrdup(pw->pw_dir);
+	}
+	/* Build a path combining the specified directory and path. */
+	len = strlen(pw->pw_dir) + strlen(cp + 1) + 2;
+	if (len > MAXPATHLEN)
+		fatal("Home directory too long (%d > %d", len-1, MAXPATHLEN-1);
+	expanded = xmalloc(len);
+	snprintf(expanded, len, "%s/%s", pw->pw_dir, cp + 1);
+	return expanded;
+}