93 lines
1.8 KiB
C
93 lines
1.8 KiB
C
/*
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* $Id: loadalias.c,v 1.9 1997/11/09 06:22:41 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 <alias.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 <sys/socket.h>
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#include <unistd.h>
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#include "command.h"
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#include "systems.h"
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#include "mbuf.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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#include "defs.h"
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#include "vars.h"
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#define _PATH_ALIAS "/usr/lib/libalias.so." ## __libalias_version
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#define off(item) ((int)&(((struct aliasHandlers *)0)->item))
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#define entry(a) { off(a), "_" #a }
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static struct {
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int offset;
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char *name;
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} map[] = {
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entry(PacketAliasGetFragment),
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entry(PacketAliasInit),
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entry(PacketAliasIn),
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entry(PacketAliasOut),
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entry(PacketAliasRedirectAddr),
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entry(PacketAliasRedirectPort),
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entry(PacketAliasSaveFragment),
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entry(PacketAliasSetAddress),
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entry(PacketAliasSetMode),
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entry(PacketAliasFragmentIn),
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{ 0, 0 }
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};
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static void *dl;
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int
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loadAliasHandlers(struct aliasHandlers * h)
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{
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char *path;
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char *env;
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int i;
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path = _PATH_ALIAS;
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env = getenv("_PATH_ALIAS");
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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 value (%s)\n", env);
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dl = dlopen(path, RTLD_LAZY);
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if (dl == (void *) 0) {
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LogPrintf(LogWARN, "_PATH_ALIAS (%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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for (i = 0; map[i].name; i++) {
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*(void **) ((char *) h + map[i].offset) = dlsym(dl, map[i].name);
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if (*(void **) ((char *) h + 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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(void) dlclose(dl);
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dl = (void *) 0;
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return -1;
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}
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}
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VarPacketAliasInit();
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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 (dl) {
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dlclose(dl);
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dl = (void *) 0;
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}
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}
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