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/*-
* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $Id: loadalias.c,v 1.2 1997/12/21 14:27:07 brian Exp $
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <alias.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <unistd.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "systems.h"
#include "id.h"
#include "loadalias.h"
#include "defs.h"
#include "vars.h"
#define _PATH_ALIAS "/usr/lib/libalias.so." ## __libalias_version
#define off(item) ((int)&(((struct aliasHandlers *)0)->item))
#define entry(a) { off(a), "_" #a }
static struct {
int offset;
const char *name;
} map[] = {
entry(PacketAliasGetFragment),
entry(PacketAliasInit),
entry(PacketAliasIn),
entry(PacketAliasOut),
entry(PacketAliasRedirectAddr),
entry(PacketAliasRedirectPort),
entry(PacketAliasSaveFragment),
entry(PacketAliasSetAddress),
entry(PacketAliasSetMode),
entry(PacketAliasFragmentIn),
{ 0, 0 }
};
static void *dl;
int
loadAliasHandlers(struct aliasHandlers * h)
{
const char *path;
const char *env;
int i;
path = _PATH_ALIAS;
env = getenv("_PATH_ALIAS");
if (env)
if (ID0realuid() == 0)
path = env;
else
LogPrintf(LogALERT, "Ignoring environment _PATH_ALIAS value (%s)\n", env);
dl = dlopen(path, RTLD_LAZY);
if (dl == (void *) 0) {
LogPrintf(LogWARN, "_PATH_ALIAS (%s): Invalid lib: %s\n",
path, dlerror());
return -1;
}
for (i = 0; map[i].name; i++) {
*(void **) ((char *) h + map[i].offset) = dlsym(dl, map[i].name);
if (*(void **) ((char *) h + map[i].offset) == (void *) 0) {
LogPrintf(LogWARN, "_PATH_ALIAS (%s): %s: %s\n", path,
map[i].name, dlerror());
(void) dlclose(dl);
dl = (void *) 0;
return -1;
}
}
VarPacketAliasInit();
return 0;
}
void
unloadAliasHandlers()
{
if (dl) {
dlclose(dl);
dl = (void *) 0;
}
}
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