libredirect: use __interpose on darwin
DYLD_FORCE_FLAT_NAMESPACE was removed in recent versions of macOS.
This commit is contained in:
Stéphan Kochen
parent
4789953e5c
commit
d1a3b5c4cc
2 changed files with 88 additions and 42 deletions
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@ -38,11 +38,11 @@ stdenv.mkDerivation rec {
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install -vD "$libName" "$out/lib/$libName"
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# Provide a setup hook that injects our library into every process.
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mkdir -p "$hook/nix-support"
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cat <<SETUP_HOOK > "$hook/nix-support/setup-hook"
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${if stdenv.isDarwin then ''
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export DYLD_INSERT_LIBRARIES="$out/lib/$libName"
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export DYLD_FORCE_FLAT_NAMESPACE=1
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'' else ''
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export LD_PRELOAD="$out/lib/$libName"
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''}
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@ -2,6 +2,7 @@
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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@ -13,6 +14,22 @@
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#define MAX_REDIRECTS 128
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#ifdef __APPLE__
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struct dyld_interpose {
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const void * replacement;
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const void * replacee;
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};
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#define WRAPPER(ret, name) static ret _libredirect_wrapper_##name
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#define LOOKUP_REAL(name) &name
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#define WRAPPER_DEF(name) \
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__attribute__((used)) static struct dyld_interpose _libredirect_interpose_##name \
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__attribute__((section("__DATA,__interpose"))) = { &_libredirect_wrapper_##name, &name };
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#else
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#define WRAPPER(ret, name) ret name
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#define LOOKUP_REAL(name) dlsym(RTLD_NEXT, #name)
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#define WRAPPER_DEF(name)
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#endif
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static int nrRedirects = 0;
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static char * from[MAX_REDIRECTS];
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static char * to[MAX_REDIRECTS];
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@ -80,9 +97,9 @@ static int open_needs_mode(int flags)
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it contains only what we needed for programs in Nixpkgs. Just add
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more functions as needed. */
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int open(const char * path, int flags, ...)
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WRAPPER(int, open)(const char * path, int flags, ...)
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{
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int (*open_real) (const char *, int, mode_t) = dlsym(RTLD_NEXT, "open");
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int (*open_real) (const char *, int, mode_t) = LOOKUP_REAL(open);
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mode_t mode = 0;
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if (open_needs_mode(flags)) {
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va_list ap;
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@ -93,10 +110,12 @@ int open(const char * path, int flags, ...)
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char buf[PATH_MAX];
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return open_real(rewrite(path, buf), flags, mode);
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}
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WRAPPER_DEF(open)
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int open64(const char * path, int flags, ...)
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#ifndef __APPLE__
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WRAPPER(int, open64)(const char * path, int flags, ...)
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{
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int (*open64_real) (const char *, int, mode_t) = dlsym(RTLD_NEXT, "open64");
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int (*open64_real) (const char *, int, mode_t) = LOOKUP_REAL(open64);
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mode_t mode = 0;
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if (open_needs_mode(flags)) {
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va_list ap;
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@ -107,10 +126,12 @@ int open64(const char * path, int flags, ...)
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char buf[PATH_MAX];
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return open64_real(rewrite(path, buf), flags, mode);
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}
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WRAPPER_DEF(open64)
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#endif
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int openat(int dirfd, const char * path, int flags, ...)
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WRAPPER(int, openat)(int dirfd, const char * path, int flags, ...)
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{
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int (*openat_real) (int, const char *, int, mode_t) = dlsym(RTLD_NEXT, "openat");
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int (*openat_real) (int, const char *, int, mode_t) = LOOKUP_REAL(openat);
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mode_t mode = 0;
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if (open_needs_mode(flags)) {
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va_list ap;
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@ -121,57 +142,73 @@ int openat(int dirfd, const char * path, int flags, ...)
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char buf[PATH_MAX];
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return openat_real(dirfd, rewrite(path, buf), flags, mode);
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}
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WRAPPER_DEF(openat)
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FILE * fopen(const char * path, const char * mode)
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WRAPPER(FILE *, fopen)(const char * path, const char * mode)
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{
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FILE * (*fopen_real) (const char *, const char *) = dlsym(RTLD_NEXT, "fopen");
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FILE * (*fopen_real) (const char *, const char *) = LOOKUP_REAL(fopen);
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char buf[PATH_MAX];
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return fopen_real(rewrite(path, buf), mode);
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}
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WRAPPER_DEF(fopen)
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FILE * __nss_files_fopen(const char * path)
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#ifndef __APPLE__
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WRAPPER(FILE *, __nss_files_fopen)(const char * path)
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{
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FILE * (*__nss_files_fopen_real) (const char *) = dlsym(RTLD_NEXT, "__nss_files_fopen");
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FILE * (*__nss_files_fopen_real) (const char *) = LOOKUP_REAL(__nss_files_fopen);
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char buf[PATH_MAX];
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return __nss_files_fopen_real(rewrite(path, buf));
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}
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WRAPPER_DEF(__nss_files_fopen)
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#endif
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FILE * fopen64(const char * path, const char * mode)
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#ifndef __APPLE__
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WRAPPER(FILE *, fopen64)(const char * path, const char * mode)
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{
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FILE * (*fopen64_real) (const char *, const char *) = dlsym(RTLD_NEXT, "fopen64");
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FILE * (*fopen64_real) (const char *, const char *) = LOOKUP_REAL(fopen64);
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char buf[PATH_MAX];
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return fopen64_real(rewrite(path, buf), mode);
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}
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WRAPPER_DEF(fopen64)
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#endif
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int __xstat(int ver, const char * path, struct stat * st)
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#ifndef __APPLE__
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WRAPPER(int, __xstat)(int ver, const char * path, struct stat * st)
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{
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int (*__xstat_real) (int ver, const char *, struct stat *) = dlsym(RTLD_NEXT, "__xstat");
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int (*__xstat_real) (int ver, const char *, struct stat *) = LOOKUP_REAL(__xstat);
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char buf[PATH_MAX];
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return __xstat_real(ver, rewrite(path, buf), st);
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}
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WRAPPER_DEF(__xstat)
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#endif
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int __xstat64(int ver, const char * path, struct stat64 * st)
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#ifndef __APPLE__
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WRAPPER(int, __xstat64)(int ver, const char * path, struct stat64 * st)
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{
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int (*__xstat64_real) (int ver, const char *, struct stat64 *) = dlsym(RTLD_NEXT, "__xstat64");
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int (*__xstat64_real) (int ver, const char *, struct stat64 *) = LOOKUP_REAL(__xstat64);
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char buf[PATH_MAX];
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return __xstat64_real(ver, rewrite(path, buf), st);
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}
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WRAPPER_DEF(__xstat64)
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#endif
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int stat(const char * path, struct stat * st)
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WRAPPER(int, stat)(const char * path, struct stat * st)
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{
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int (*__stat_real) (const char *, struct stat *) = dlsym(RTLD_NEXT, "stat");
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int (*__stat_real) (const char *, struct stat *) = LOOKUP_REAL(stat);
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char buf[PATH_MAX];
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return __stat_real(rewrite(path, buf), st);
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}
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WRAPPER_DEF(stat)
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int access(const char * path, int mode)
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WRAPPER(int, access)(const char * path, int mode)
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{
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int (*access_real) (const char *, int mode) = dlsym(RTLD_NEXT, "access");
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int (*access_real) (const char *, int mode) = LOOKUP_REAL(access);
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char buf[PATH_MAX];
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return access_real(rewrite(path, buf), mode);
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}
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WRAPPER_DEF(access)
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int posix_spawn(pid_t * pid, const char * path,
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WRAPPER(int, posix_spawn)(pid_t * pid, const char * path,
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const posix_spawn_file_actions_t * file_actions,
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const posix_spawnattr_t * attrp,
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char * const argv[], char * const envp[])
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@ -179,12 +216,13 @@ int posix_spawn(pid_t * pid, const char * path,
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int (*posix_spawn_real) (pid_t *, const char *,
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const posix_spawn_file_actions_t *,
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const posix_spawnattr_t *,
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char * const argv[], char * const envp[]) = dlsym(RTLD_NEXT, "posix_spawn");
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char * const argv[], char * const envp[]) = LOOKUP_REAL(posix_spawn);
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char buf[PATH_MAX];
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return posix_spawn_real(pid, rewrite(path, buf), file_actions, attrp, argv, envp);
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}
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WRAPPER_DEF(posix_spawn)
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int posix_spawnp(pid_t * pid, const char * file,
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WRAPPER(int, posix_spawnp)(pid_t * pid, const char * file,
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const posix_spawn_file_actions_t * file_actions,
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const posix_spawnattr_t * attrp,
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char * const argv[], char * const envp[])
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@ -192,43 +230,48 @@ int posix_spawnp(pid_t * pid, const char * file,
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int (*posix_spawnp_real) (pid_t *, const char *,
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const posix_spawn_file_actions_t *,
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const posix_spawnattr_t *,
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char * const argv[], char * const envp[]) = dlsym(RTLD_NEXT, "posix_spawnp");
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char * const argv[], char * const envp[]) = LOOKUP_REAL(posix_spawnp);
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char buf[PATH_MAX];
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return posix_spawnp_real(pid, rewrite(file, buf), file_actions, attrp, argv, envp);
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}
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WRAPPER_DEF(posix_spawnp)
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int execv(const char * path, char * const argv[])
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WRAPPER(int, execv)(const char * path, char * const argv[])
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{
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int (*execv_real) (const char * path, char * const argv[]) = dlsym(RTLD_NEXT, "execv");
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int (*execv_real) (const char * path, char * const argv[]) = LOOKUP_REAL(execv);
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char buf[PATH_MAX];
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return execv_real(rewrite(path, buf), argv);
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}
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WRAPPER_DEF(execv)
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int execvp(const char * path, char * const argv[])
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WRAPPER(int, execvp)(const char * path, char * const argv[])
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{
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int (*_execvp) (const char *, char * const argv[]) = dlsym(RTLD_NEXT, "execvp");
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int (*_execvp) (const char *, char * const argv[]) = LOOKUP_REAL(execvp);
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char buf[PATH_MAX];
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return _execvp(rewrite(path, buf), argv);
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}
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WRAPPER_DEF(execvp)
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int execve(const char * path, char * const argv[], char * const envp[])
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WRAPPER(int, execve)(const char * path, char * const argv[], char * const envp[])
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{
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int (*_execve) (const char *, char * const argv[], char * const envp[]) = dlsym(RTLD_NEXT, "execve");
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int (*_execve) (const char *, char * const argv[], char * const envp[]) = LOOKUP_REAL(execve);
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char buf[PATH_MAX];
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return _execve(rewrite(path, buf), argv, envp);
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}
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WRAPPER_DEF(execve)
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DIR * opendir(const char * path)
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WRAPPER(DIR *, opendir)(const char * path)
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{
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char buf[PATH_MAX];
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DIR * (*_opendir) (const char*) = dlsym(RTLD_NEXT, "opendir");
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DIR * (*_opendir) (const char*) = LOOKUP_REAL(opendir);
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return _opendir(rewrite(path, buf));
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}
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WRAPPER_DEF(opendir)
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#define SYSTEM_CMD_MAX 512
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char *replace_substring(char * source, char * buf, char * replace_string, char * start_ptr, char * suffix_ptr) {
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static char * replace_substring(char * source, char * buf, char * replace_string, char * start_ptr, char * suffix_ptr) {
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char head[SYSTEM_CMD_MAX] = {0};
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strncpy(head, source, start_ptr - source);
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@ -241,7 +284,7 @@ char *replace_substring(char * source, char * buf, char * replace_string, char *
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return buf;
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}
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char *replace_string(char * buf, char * from, char * to) {
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static char * replace_string(char * buf, char * from, char * to) {
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int num_matches = 0;
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char * matches[SYSTEM_CMD_MAX];
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int from_len = strlen(from);
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@ -264,32 +307,35 @@ char *replace_string(char * buf, char * from, char * to) {
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return buf;
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}
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void rewriteSystemCall(const char * command, char * buf) {
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static void rewriteSystemCall(const char * command, char * buf) {
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strcpy(buf, command);
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for (int n = 0; n < nrRedirects; ++n) {
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replace_string(buf, from[n], to[n]);
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}
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}
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int system(const char *command)
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WRAPPER(int, system)(const char *command)
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{
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int (*_system) (const char*) = dlsym(RTLD_NEXT, "system");
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int (*_system) (const char*) = LOOKUP_REAL(system);
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char newCommand[SYSTEM_CMD_MAX];
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rewriteSystemCall(command, newCommand);
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return _system(newCommand);
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}
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WRAPPER_DEF(system)
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int mkdir(const char *path, mode_t mode)
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WRAPPER(int, mkdir)(const char *path, mode_t mode)
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{
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int (*mkdir_real) (const char *path, mode_t mode) = dlsym(RTLD_NEXT, "mkdir");
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int (*mkdir_real) (const char *path, mode_t mode) = LOOKUP_REAL(mkdir);
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char buf[PATH_MAX];
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return mkdir_real(rewrite(path, buf), mode);
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}
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WRAPPER_DEF(mkdir)
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int mkdirat(int dirfd, const char *path, mode_t mode)
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WRAPPER(int, mkdirat)(int dirfd, const char *path, mode_t mode)
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{
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int (*mkdirat_real) (int dirfd, const char *path, mode_t mode) = dlsym(RTLD_NEXT, "mkdirat");
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int (*mkdirat_real) (int dirfd, const char *path, mode_t mode) = LOOKUP_REAL(mkdirat);
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char buf[PATH_MAX];
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return mkdirat_real(dirfd, rewrite(path, buf), mode);
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}
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WRAPPER_DEF(mkdirat)
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