1 files changed, 150 insertions, 0 deletions
diff --git a/pinentry/util.c b/pinentry/util.c
new file mode 100644
index 0000000..a47164a
--- /dev/null
+++ b/pinentry/util.c
@@ -0,0 +1,150 @@
+/* Quintuple Agent
+ * Copyright (C) 1999 Robert Bihlmeyer <robbe@orcus.priv.at>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _GNU_SOURCE 1
+
+#include <unistd.h>
+#ifndef HAVE_W32CE_SYSTEM
+# include <errno.h>
+#endif
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "util.h"
+
+#ifndef HAVE_DOSISH_SYSTEM
+static int uid_set = 0;
+static uid_t real_uid, file_uid;
+#endif /*!HAVE_DOSISH_SYSTEM*/
+
+/* Write DATA of size BYTES to FD, until all is written or an error
+   occurs.  */
+ssize_t 
+xwrite(int fd, const void *data, size_t bytes)
+{
+  char *ptr;
+  size_t todo;
+  ssize_t written = 0;
+
+  for (ptr = (char *)data, todo = bytes; todo; ptr += written, todo -= written)
+    {
+      do
+        written = write (fd, ptr, todo);
+      while (
+#ifdef HAVE_W32CE_SYSTEM
+             0
+#else
+             written == -1 && errno == EINTR
+#endif
+             );
+      if (written < 0)
+        break;
+    }
+  return written;
+}
+
+#if 0
+extern int debug;
+
+int 
+debugmsg(const char *fmt, ...)
+{
+  va_list va;
+  int ret;
+
+  if (debug) {
+    va_start(va, fmt);
+    fprintf(stderr, "\e[4m");
+    ret = vfprintf(stderr, fmt, va);
+    fprintf(stderr, "\e[24m");
+    va_end(va);
+    return ret;
+  } else
+    return 0;
+}
+#endif
+
+/* initialize uid variables */
+#ifndef HAVE_DOSISH_SYSTEM
+static void 
+init_uids(void)
+{
+  real_uid = getuid();
+  file_uid = geteuid();
+  uid_set = 1;
+}
+#endif
+
+
+#if 0 /* Not used. */
+/* lower privileges to the real user's */
+void 
+lower_privs()
+{
+  if (!uid_set)
+    init_uids();
+  if (real_uid != file_uid) {
+#ifdef HAVE_SETEUID
+    if (seteuid(real_uid) < 0) {
+      perror("lowering privileges failed");
+      exit(EXIT_FAILURE);
+    }
+#else
+    fprintf(stderr, _("Warning: running q-agent setuid on this system is dangerous\n"));
+#endif /* HAVE_SETEUID */
+  }
+}
+#endif /* if 0 */
+
+#if 0 /* Not used. */
+/* raise privileges to the effective user's */
+void 
+raise_privs()
+{
+  assert(real_uid >= 0);	/* lower_privs() must be called before this */
+#ifdef HAVE_SETEUID
+  if (real_uid != file_uid && seteuid(file_uid) < 0) {
+   perror("Warning: raising privileges failed");
+  }
+#endif /* HAVE_SETEUID */
+}
+#endif /* if 0 */
+
+/* drop all additional privileges */
+void 
+drop_privs()
+{
+#ifndef HAVE_DOSISH_SYSTEM
+  if (!uid_set)
+    init_uids();
+  if (real_uid != file_uid) {
+    if (setuid(real_uid) < 0) {
+      perror("dropping privileges failed");
+      exit(EXIT_FAILURE);
+    }
+    file_uid = real_uid;
+  }
+#endif
+}