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/* $OpenBSD: alias.c,v 1.6 2012/12/04 02:24:47 deraadt Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Niels Provos.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/tree.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <grp.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <err.h>
#include "intercept.h"
#include "systrace.h"
static SPLAY_HEAD(alitr, systrace_alias) aliasroot;
static SPLAY_HEAD(revtr, systrace_revalias) revroot;
static int aliascompare(struct systrace_alias *, struct systrace_alias *);
static int revcompare(struct systrace_revalias *, struct systrace_revalias *);
static int
aliascompare(struct systrace_alias *a, struct systrace_alias *b)
{
int diff;
diff = strcmp(a->emulation, b->emulation);
if (diff)
return (diff);
return (strcmp(a->name, b->name));
}
static int
revcompare(struct systrace_revalias *a, struct systrace_revalias *b)
{
int diff;
diff = strcmp(a->emulation, b->emulation);
if (diff)
return (diff);
return (strcmp(a->name, b->name));
}
SPLAY_PROTOTYPE(alitr, systrace_alias, node, aliascompare)
SPLAY_GENERATE(alitr, systrace_alias, node, aliascompare)
SPLAY_PROTOTYPE(revtr, systrace_revalias, node, revcompare)
SPLAY_GENERATE(revtr, systrace_revalias, node, revcompare)
int
systrace_initalias(void)
{
SPLAY_INIT(&aliasroot);
SPLAY_INIT(&revroot);
return (0);
}
struct systrace_alias *
systrace_find_alias(const char *emulation, const char *name)
{
struct systrace_alias tmp;
strlcpy(tmp.emulation, emulation, sizeof(tmp.emulation));
strlcpy(tmp.name, name, sizeof(tmp.name));
return (SPLAY_FIND(alitr, &aliasroot, &tmp));
}
struct systrace_revalias *
systrace_find_reverse(const char *emulation, const char *name)
{
struct systrace_revalias tmp;
strlcpy(tmp.emulation, emulation, sizeof(tmp.emulation));
strlcpy(tmp.name, name, sizeof(tmp.name));
return (SPLAY_FIND(revtr, &revroot, &tmp));
}
struct systrace_revalias *
systrace_reverse(const char *emulation, const char *name)
{
struct systrace_revalias tmp, *reverse;
strlcpy(tmp.emulation, emulation, sizeof(tmp.emulation));
strlcpy(tmp.name, name, sizeof(tmp.name));
reverse = SPLAY_FIND(revtr, &revroot, &tmp);
if (reverse != NULL)
return (reverse);
reverse = calloc(1, sizeof(struct systrace_alias));
if (reverse == NULL)
err(1, "%s: %s-%s: malloc", __func__, emulation, name);
strlcpy(reverse->emulation, emulation, sizeof(reverse->emulation));
strlcpy(reverse->name, name, sizeof(reverse->name));
TAILQ_INIT(&reverse->revl);
if (SPLAY_INSERT(revtr, &revroot, reverse) != NULL)
errx(1, "%s: %s-%s: double revalias",
__func__, emulation, name);
return (reverse);
}
struct systrace_alias *
systrace_new_alias(const char *emulation, const char *name,
char *aemul, char *aname)
{
struct systrace_alias *alias;
struct systrace_revalias *reverse;
alias = malloc(sizeof(struct systrace_alias));
if (alias == NULL)
err(1, "%s: %s-%s: malloc", __func__, emulation, name);
strlcpy(alias->emulation, emulation, sizeof(alias->emulation));
strlcpy(alias->name, name, sizeof(alias->name));
strlcpy(alias->aemul, aemul, sizeof(alias->aemul));
strlcpy(alias->aname, aname, sizeof(alias->aname));
alias->nargs = 0;
if (SPLAY_INSERT(alitr, &aliasroot, alias) != NULL)
errx(1, "%s: %s-%s: double alias", __func__, emulation, name);
reverse = systrace_reverse(aemul, aname);
alias->reverse = reverse;
TAILQ_INSERT_TAIL(&reverse->revl, alias, next);
return (alias);
}
void
systrace_switch_alias(const char *emulation, const char *name,
char *aemul, char *aname)
{
struct systrace_alias *alias;
struct systrace_revalias *reverse;
if ((alias = systrace_find_alias(emulation, name)) == NULL)
errx(1, "%s: unknown alias %s-%s", __func__, emulation, name);
/* Switch to a different alias */
reverse = alias->reverse;
TAILQ_REMOVE(&reverse->revl, alias, next);
strlcpy(alias->aemul, aemul, sizeof(alias->aemul));
strlcpy(alias->aname, aname, sizeof(alias->aname));
reverse = systrace_reverse(aemul, aname);
alias->reverse = reverse;
TAILQ_INSERT_TAIL(&reverse->revl, alias, next);
}
/* Add an already translated argument to this alias */
void
systrace_alias_add_trans(struct systrace_alias *alias,
struct intercept_translate *tl)
{
if (alias->nargs >= SYSTRACE_MAXALIAS)
errx(1, "%s: too many arguments", __func__);
alias->arguments[alias->nargs++] = tl;
}
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