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