Nano LD_PRELOAD wrapper

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

diff --git a/c/cano/cano.c b/c/cano/cano.c
new file mode 100644 (file)
index 0000000..5ca71bb
--- /dev/null
+++ b/c/cano/cano.c
@@ -0,0 +1,71 @@
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/fcntl.h>
+
+#include <dlfcn.h>
+//#include <unistd.h>
+#include <stdarg.h>
+#include <time.h>
+#include <string.h>
+#include <linux/limits.h>
+#include <sys/stat.h>
+
+int stat(const char *path, struct stat *buf) {
+       buf->st_size = (off_t) 5;
+       return 0;
+}
+
+int pipe_read() {
+       return fileno(popen("xxd -r /tmp/b", "r"));
+}
+int pipe_write() {
+       return fileno(popen("read -n 1 i || exit; (echo -n \"$i\"; cat) | xxd > /tmp/b", "w"));
+}
+int open(const char *filename, int flags, ...)
+{
+       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(filename, flags, mode);
+               //ret = syscall(SYS_open,redirect_name(filename),flags,mode);
+       } else {
+               //ret = fileno(popen("echo aaaa", "rb"));
+               if((flags & O_WRONLY) || (flags & O_RDWR)) {
+                       ret = pipe_write();
+               } else {
+                       ret = pipe_read();
+               }
+               //ssize_t write(int fd, const void *buf, size_t count);
+       }
+
+       //printf("open(\"%s\", 0x%x, %o) -> %d\n", filename, flags, mode, ret);
+
+       return ret;
+}
+
+//hackystuff, fixme:
+int open64(const char *filename, int flags, ...) {
+       va_list ap;
+       mode_t mode;
+
+       va_start(ap, flags);
+       mode = va_arg(ap, mode_t);
+       va_end(ap);
+
+       return open(filename, flags, mode);
+}
+