168 lines
4.4 KiB
C
168 lines
4.4 KiB
C
/*-
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* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: loadalias.c,v 1.14.2.3 1998/04/18 01:01:23 brian Exp $
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*/
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <dirent.h>
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#include <dlfcn.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 <unistd.h>
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#include "log.h"
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#include "id.h"
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#include "loadalias.h"
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#define _PATH_ALIAS_PREFIX "/usr/lib/libalias.so.2."
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#define off(item) ((int)&(((struct aliasHandlers *)0)->item))
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#define entry(a) { off(a), "_PacketAlias" #a }
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#ifndef RTLD_NOW
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#define RTLD_NOW 1 /* really RTLD_LAZY */
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#endif
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static struct {
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int offset;
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const char *name;
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} map[] = {
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entry(GetFragment),
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entry(Init),
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entry(In),
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entry(Out),
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entry(RedirectAddr),
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entry(RedirectPort),
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entry(SaveFragment),
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entry(SetAddress),
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entry(SetMode),
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entry(FragmentIn),
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{ 0, 0 }
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};
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struct aliasHandlers PacketAlias;
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int
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loadAliasHandlers()
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{
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const char *path;
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const char *env;
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int i;
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if (PacketAlias.dl)
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return 0;
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path = _PATH_ALIAS_PREFIX;
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env = getenv("_PATH_ALIAS_PREFIX");
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if (env) {
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if (ID0realuid() == 0)
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path = env;
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else
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LogPrintf(LogALERT, "Ignoring environment _PATH_ALIAS_PREFIX"
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" value (%s)\n", env);
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}
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PacketAlias.dl = dlopen(path, RTLD_NOW);
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if (PacketAlias.dl == (void *) 0) {
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/* Look for _PATH_ALIAS_PREFIX with any number appended */
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int plen;
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plen = strlen(path);
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if (plen && plen < MAXPATHLEN - 1 && path[plen-1] == '.') {
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DIR *d;
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char p[MAXPATHLEN], *fix, *file;
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const char *dir;
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strcpy(p, path);
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if ((file = strrchr(p, '/')) != NULL) {
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fix = file;
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*file++ = '\0';
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dir = p;
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} else {
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fix = NULL;
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file = p;
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dir = ".";
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}
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if ((d = opendir(dir))) {
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struct dirent *entry;
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int flen;
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char *end;
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long maxver, ver;
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if (fix)
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*fix = '/';
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maxver = -1;
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flen = strlen(file);
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while ((entry = readdir(d)))
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if (entry->d_namlen > flen && !strncmp(entry->d_name, file, flen)) {
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ver = strtol(entry->d_name + flen, &end, 10);
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strcpy(p + plen, entry->d_name + flen);
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if (ver >= 0 && *end == '\0' && ver > maxver &&
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access(p, R_OK) == 0)
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maxver = ver;
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}
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closedir(d);
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if (maxver > -1) {
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sprintf(p + plen, "%ld", maxver);
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PacketAlias.dl = dlopen(p, RTLD_NOW);
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}
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}
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}
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if (PacketAlias.dl == (void *) 0) {
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LogPrintf(LogWARN, "_PATH_ALIAS_PREFIX (%s*): Invalid lib: %s\n",
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path, dlerror());
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return -1;
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}
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}
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for (i = 0; map[i].name; i++) {
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*(void **)((char *)&PacketAlias + map[i].offset) =
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dlsym(PacketAlias.dl, map[i].name);
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if (*(void **)((char *)&PacketAlias + map[i].offset) == (void *)0) {
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LogPrintf(LogWARN, "_PATH_ALIAS (%s*): %s: %s\n", path,
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map[i].name, dlerror());
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unloadAliasHandlers();
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return -1;
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}
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}
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(*PacketAlias.Init)();
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return 0;
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}
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void
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unloadAliasHandlers()
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{
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if (PacketAlias.dl) {
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dlclose(PacketAlias.dl);
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memset(&PacketAlias, '\0', sizeof PacketAlias);
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}
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}
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