70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef __APPLE__
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#include <sandbox.h>
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#include <unistd.h>
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#endif
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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 _fakeroot_wrapper_##name
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#define WRAPPER_DEF(name) \
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__attribute__(( \
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used)) static struct dyld_interpose _fakeroot_interpose_##name \
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__attribute__((section("__DATA,__interpose"))) = { \
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&_fakeroot_wrapper_##name, &name};
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#else
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#define WRAPPER(ret, name) ret name
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#define WRAPPER_DEF(name)
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#endif
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typedef struct passwd *(*getpwnam_type)(const char *name);
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WRAPPER(struct passwd *, getpwnam)(const char *name) {
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struct passwd *pw;
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#ifdef __APPLE__
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#define orig_getpwnam(name) getpwnam(name)
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#else
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static getpwnam_type orig_getpwnam = NULL;
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if (!orig_getpwnam) {
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orig_getpwnam = (getpwnam_type)dlsym(RTLD_NEXT, "getpwnam");
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if (!orig_getpwnam) {
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fprintf(stderr, "dlsym error: %s\n", dlerror());
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exit(1);
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}
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}
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#endif
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pw = orig_getpwnam(name);
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if (pw) {
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const char *shell = getenv("LOGIN_SHELL");
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if (!shell) {
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fprintf(stderr, "no LOGIN_SHELL set\n");
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exit(1);
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}
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pw->pw_shell = strdup(shell);
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fprintf(stderr, "getpwnam: %s -> %s\n", name, pw->pw_shell);
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}
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return pw;
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}
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WRAPPER_DEF(getpwnam)
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#ifdef __APPLE__
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// sandbox_init(3) doesn't work in nix build sandbox
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WRAPPER(int, sandbox_init)(const char *profile, uint64_t flags, void *handle) {
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return 0;
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}
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WRAPPER_DEF(sandbox_init)
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#else
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#endif
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