/* 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_SYSTEMstatic 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 0extern 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_SYSTEMstatic 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}