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simplify load_sym code and remove potential aliasing violation.

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This commit is contained in:
rofl0r 2012-07-08 00:27:46 +02:00
parent d95ef42d48
commit 2c9c4d9da7
1 changed files with 15 additions and 23 deletions
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38
src/libproxychains.c
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@ -70,49 +70,41 @@ static int init_l = 0;
static inline void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_type * ct);
static void load_sym(void** funcptr, char* symname, void* proxyfunc) {
static void* load_sym(char* symname, void* proxyfunc) {
*funcptr = dlsym(RTLD_NEXT, symname);
void *funcptr = dlsym(RTLD_NEXT, symname);
if(!(*funcptr)) {
if(!funcptr) {
fprintf(stderr, "Cannot load symbol '%s' %s\n", symname, dlerror());
exit(1);
} else {
PDEBUG("loaded symbol '%s'" " real addr %p wrapped addr %p\n", symname, (*funcptr), proxyfunc);
}
if((*funcptr) == proxyfunc) {
if(funcptr == proxyfunc) {
PDEBUG("circular reference detected, aborting!\n");
abort();
}
return funcptr;
}
#define INIT() init_lib_wrapper(__FUNCTION__)
#define SETUP_SYM(X) do { true_ ## X = load_sym( # X, X ); } while(0)
static void do_init(void) {
static const struct override_info {
void* funcptr;
char* symname;
void* proxyfunc;
} override_symbols[] = {
#define SYM_ENTRY(X) { .funcptr = &true_ ## X, .symname = # X, .proxyfunc = X,}
SYM_ENTRY(connect),
SYM_ENTRY(gethostbyname),
SYM_ENTRY(getaddrinfo),
SYM_ENTRY(freeaddrinfo),
SYM_ENTRY(gethostbyaddr),
SYM_ENTRY(getnameinfo),
#undef SYM_ENTRY
};
unsigned i;
MUTEX_INIT(&internal_ips_lock, NULL);
/* read the config file */
get_chain_data(proxychains_pd, &proxychains_proxy_count, &proxychains_ct);
proxychains_write_log(LOG_PREFIX "DLL init\n");
for (i = 0; i < (sizeof(override_symbols) / sizeof(override_symbols[0])); i++) {
load_sym(override_symbols[i].funcptr, override_symbols[i].symname, override_symbols[i].proxyfunc);
}
SETUP_SYM(connect);
SETUP_SYM(gethostbyname);
SETUP_SYM(getaddrinfo);
SETUP_SYM(freeaddrinfo);
SETUP_SYM(gethostbyaddr);
SETUP_SYM(getnameinfo);
init_l = 1;
}