6ed9fb2fc9
alias commands simply won't work. Only root may specify the location of the alias lib (otherwise, it's hard-coded). Make logprintf silently fail if LogOpen hasn't been called. Suggested by: eivind
89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <dlfcn.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 "loadalias.h"
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#include "vars.h"
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#define _PATH_ALIAS "/usr/lib/libalias.so.2.1"
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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(GetNextFragmentPtr),
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entry(GetNextFragmentPtr),
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entry(InitPacketAlias),
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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(SaveFragmentPtr),
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entry(SetPacketAliasAddress),
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entry(SetPacketAliasMode),
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entry(FragmentAliasIn),
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{ 0, 0 }
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};
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static void *dl;
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int loadAliasHandlers(struct aliasHandlers *h)
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{
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char *path;
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char *env;
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char *err;
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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 (OrigUid() == 0)
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path = env;
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else {
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logprintf("Ignoring environment _PATH_ALIAS value (%s)\n", env);
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printf("Ignoring environment _PATH_ALIAS value (%s)\n", env);
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}
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dl = dlopen(path, RTLD_LAZY);
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if (dl == (void *)0) {
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err = dlerror();
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logprintf("_PATH_ALIAS (%s): Invalid lib: %s\n", path, err);
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printf("_PATH_ALIAS (%s): Invalid lib: %s\n", path, err);
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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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err = dlerror();
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logprintf("_PATH_ALIAS (%s): %s: %s\n", path, map[i].name, err);
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printf("_PATH_ALIAS (%s): %s: %s\n", path, map[i].name, err);
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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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VarInitPacketAlias();
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return 0;
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}
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void 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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