#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <dlfcn.h>
#include <string.h>
static int is_root = 0;
static int d_ino = -1;
static DIR *(*orig_opendir)(const char *name);
static int (*orig_closedir)(DIR *dirp);
static struct dirent *(*orig_readdir)(DIR *dirp);
DIR *opendir(const char *name) {
if (strcmp(name, "/") == 0) {
is_root = 1;
}
return orig_opendir(name);
}
int closedir(DIR *dirp) {
is_root = 0;
return orig_closedir(dirp);
}
struct dirent *readdir(DIR *dirp) {
struct dirent *r = orig_readdir(dirp);
if (is_root && r) {
if (strcmp(r->d_name, ".") == 0) {
r->d_ino = d_ino;
} else if (strcmp(r->d_name, "..") == 0) {
r->d_ino = d_ino;
}
}
return r;
}
static __attribute__((constructor)) void init_methods() {
orig_opendir = dlsym(RTLD_NEXT, "opendir");
orig_closedir = dlsym(RTLD_NEXT, "closedir");
orig_readdir = dlsym(RTLD_NEXT, "readdir");
DIR *d = orig_opendir("/");
struct dirent *e = orig_readdir(d);
while (e) {
if (strcmp(e->d_name, ".") == 0) {
d_ino = e->d_ino;
break;
}
e = orig_readdir(d);
}
orig_closedir(d);
if (d_ino == -1) {
puts("Failed to determine root directory inode number");
exit(EXIT_FAILURE);
}
}
gcc -shared -fPIC hack.c -o hack.so -ldl
cat snpslmd
#!/bin/sh
export LD_PRELOAD=/data/synopsys/scl/2021.12/linux64/bin/hack.so
exec /data/synopsys/scl/2021.12/linux64/bin/snpslmd.org "$@"
https://serverfault.com/questions/922532/running-flexlm-license-server-in-a-docker-container
