Nano LD_PRELOAD wrapper

[mirrors/Programs.git] / c / cano / old / cano2.c

diff --git a/c/cano/old/cano2.c b/c/cano/old/cano2.c
new file mode 100644 (file)
index 0000000..3483431
--- /dev/null
+++ b/c/cano/old/cano2.c
@@ -0,0 +1,81 @@
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <dlfcn.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <time.h>
+#include <string.h>
+
+#define i { srand(23); printf("%s();\n",__func__); }
+//Catch open() calls (while redirecting filename):
+static const char *redirect_name(const char *name)
+{
+       if(
+               (strcmp(name,"/dev/random") == 0) ||
+               (strcmp(name,"/dev/urandom") == 0)
+       ) {
+               printf("REDIRECT HIT: %s\n", name);
+               return "/dev/zero";
+       }
+       return name;
+}
+
+
+int open(const char *filename, int flags, ...)
+{
+       //srand(23);
+       static int (*open_orig)(const char *, int, mode_t);
+       int ret;
+       va_list ap;
+       mode_t mode;
+
+       if (!open_orig) {
+               open_orig = dlsym(RTLD_NEXT, "open");
+       }
+
+       va_start(ap, flags);
+       mode = va_arg(ap, mode_t);
+       va_end(ap);
+
+       if(strcmp(filename,"/tmp/a") != 0) {
+               ret = open_orig(redirect_name(filename), flags, mode);
+               //ret = syscall(SYS_open,redirect_name(filename),flags,mode);
+       } else {
+               ret = popen("tee aaaa", "w");
+       }
+
+       printf("open(\"%s\", 0x%x, %o) -> %d\n", filename, flags, mode, ret);
+
+       return ret;
+}
+
+int open64(const char *filename, int flags, ...)
+{
+       //srand(23);
+       static int (*open64_orig)(const char *, int, mode_t);
+       int ret;
+       va_list ap;
+       mode_t mode;
+
+       if (!open64_orig) {
+               open64_orig = dlsym(RTLD_NEXT, "open64");
+       }
+
+       va_start(ap, flags);
+       mode = va_arg(ap, mode_t);
+       va_end(ap);
+
+       if(strcmp(filename,"/tmp/a") != 0) {
+               ret = open64_orig(redirect_name(filename), flags, mode);
+               //ret = syscall(SYS_open64,redirect_name(filename),flags,mode);
+       } else {
+               ret = popen("tee aaaa", "w");
+       }
+
+       printf("open64(\"%s\", 0x%x, %o) -> %d\n", filename, flags, mode, ret);
+
+       return ret;
+}