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preliminary support for new DYLD hooking method for OSX Monterey

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there's currently no build system support yet. after ./configure
was executed, add -DMONTEREY_HOOKING to CFLAGS/CPPFLAGS in config.mak
to activate this.

addressing #409

special thanks go to @yicong2007 and @YangshengLu for helping to
figure out this new technique.
This commit is contained in:
rofl0r 2021-12-12 18:20:59 +00:00
parent d415d8a5ed
commit 4a013fe6a5
1 changed files with 43 additions and 14 deletions
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57
src/libproxychains.c
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@ -104,25 +104,12 @@ static void* load_sym(char* symname, void* proxyfunc) {
#define INIT() init_lib_wrapper(__FUNCTION__)
#define SETUP_SYM(X) do { if (! true_ ## X ) true_ ## X = load_sym( # X, X ); } while(0)
#include "allocator_thread.h"
const char *proxychains_get_version(void);
static void setup_hooks(void) {
SETUP_SYM(connect);
SETUP_SYM(sendto);
SETUP_SYM(gethostbyname);
SETUP_SYM(getaddrinfo);
SETUP_SYM(freeaddrinfo);
SETUP_SYM(gethostbyaddr);
SETUP_SYM(getnameinfo);
#ifdef IS_SOLARIS
SETUP_SYM(__xnet_connect);
#endif
SETUP_SYM(close);
}
static void setup_hooks(void);
static int close_fds[16];
static int close_fds_cnt = 0;
@ -538,7 +525,11 @@ inv_host:
/******* HOOK FUNCTIONS *******/
#define EXPAND( args...) args
#ifdef MONTEREY_HOOKING
#define HOOKFUNC(R, N, args...) R pxcng_ ## N ( EXPAND(args) )
#else
#define HOOKFUNC(R, N, args...) R N ( EXPAND(args) )
#endif
HOOKFUNC(int, close, int fd) {
if(!init_l) {
@ -787,3 +778,41 @@ HOOKFUNC(ssize_t, sendto, int sockfd, const void *buf, size_t len, int flags,
}
return true_sendto(sockfd, buf, len, flags, dest_addr, addrlen);
}
#ifdef MONTEREY_HOOKING
#define SETUP_SYM(X) do { if (! true_ ## X ) true_ ## X = &X; } while(0)
#else
#define SETUP_SYM(X) do { if (! true_ ## X ) true_ ## X = load_sym( # X, X ); } while(0)
#endif
static void setup_hooks(void) {
SETUP_SYM(connect);
SETUP_SYM(sendto);
SETUP_SYM(gethostbyname);
SETUP_SYM(getaddrinfo);
SETUP_SYM(freeaddrinfo);
SETUP_SYM(gethostbyaddr);
SETUP_SYM(getnameinfo);
#ifdef IS_SOLARIS
SETUP_SYM(__xnet_connect);
#endif
SETUP_SYM(close);
}
#ifdef MONTEREY_HOOKING
#define DYLD_INTERPOSE(_replacement,_replacee) \
__attribute__((used)) static struct{ const void* replacement; const void* replacee; } _interpose_##_replacee \
__attribute__((section ("__DATA,__interpose"))) = { (const void*)(unsigned long)&_replacement, (const void*)(unsigned long)&_replacee };
#define DYLD_HOOK(F) DYLD_INTERPOSE(pxcng_ ## F, F)
DYLD_HOOK(connect);
DYLD_HOOK(sendto);
DYLD_HOOK(gethostbyname);
DYLD_HOOK(getaddrinfo);
DYLD_HOOK(freeaddrinfo);
DYLD_HOOK(gethostbyaddr);
DYLD_HOOK(getnameinfo);
DYLD_HOOK(close);
#endif