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util.c
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util.c
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/* 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.
*/
#define _GNU_SOURCE 1
#include <unistd.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "util.h"
#ifndef TEMP_FAILURE_RETRY
#define TEMP_FAILURE_RETRY(expression) \
(__extension__ \
({ long int __result; \
do __result = (long int) (expression); \
while (__result == -1L && errno == EINTR); \
__result; }))
#endif
static int uid_set = 0;
static uid_t real_uid, file_uid;
/* 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)
if ((written = TEMP_FAILURE_RETRY(write(fd, ptr, todo))) < 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
/* wipe out a block of N bytes starting at address PTR */
void wipe(void *ptr, size_t n)
{
/* you may want to overwrite with several different bit patterns, depending
on your belief system. */
memset(ptr, n, 0);
}
/* initialize uid variables */
static void init_uids()
{
real_uid = getuid();
file_uid = geteuid();
uid_set = 1;
}
/* 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 */
}
}
/* 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 */
}
/* drop all additional privileges */
void drop_privs()
{
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;
}
}

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text/x-c
Expires
Mon, Feb 2, 8:12 AM (1 d, 16 h)
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Storage Handle
1b/9e/898e187aa9ec0c66995df2b1299a

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