Nano LD_PRELOAD wrapper

[mirrors/Programs.git] / c / cano / old / cano3.c

diff --git a/c/cano/old/cano3.c b/c/cano/old/cano3.c
new file mode 100644 (file)
index 0000000..68ebefb
--- /dev/null
+++ b/c/cano/old/cano3.c
@@ -0,0 +1,99 @@
+#define _GNU_SOURCE
+/*
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <time.h>
+#include <string.h>
+
+       #include <sys/types.h>
+       #include <sys/stat.h>
+       #include <fcntl.h>
+*/
+#include <dlfcn.h>
+#include <stdio.h>
+#include <sys/syscall.h>
+#include <linux/limits.h>
+
+#define i { srand(23); fprintf(stderr,"%s();\n",__func__); }
+//Catch open() calls (while redirecting filename):
+
+static const char *fd_to_path(int fd) {
+       static char path[PATH_MAX];
+       sprintf(path,"/proc/self/fd/%d",fd);
+       int l = (int) readlink((char * __restrict__) path, path, PATH_MAX);
+       path[l]=0;
+       return path;
+}
+
+int close(int fd) {
+       //fputs(fd_to_path(fd),stderr);
+       fprintf(stderr,"%s(%d,%s);\n",__func__,fd,fd_to_path(fd));
+       if(fd>2) return syscall(SYS_close,fd);
+}
+int fclose(FILE *fd) {
+       //fputs(fd_to_path(fd),stderr);
+       fprintf(stderr,"%s(%d,%d,%s);\n",__func__,fileno(fd),fd,fd_to_path(fileno(fd)));
+       static ssize_t (*fclose_orig)(FILE *fd);
+       if (!fclose_orig) {
+               fclose_orig = dlsym(RTLD_NEXT, "fclose");
+       }
+       return fclose_orig(fd);
+       //return syscall(SYS_close,fileno(fd));
+}
+/*
+ssize_t write(int fd, const void *buf, size_t count) {
+       //fputs(fd_to_path(fd),stderr);
+       printf("%d",fd);
+       i;
+       return syscall(SYS_write,fd,buf,count);
+}
+*/
+/*
+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/lol.txt.asc") != 0) {
+               ret = open_orig(redirect_name(filename), flags, mode);
+               //ret = syscall(SYS_open,redirect_name(filename),flags,mode);
+       } else {
+               if(flags & O_RDONLY) {
+                       ret = fileno(popen("cat aaaa", "r"));
+               } else {
+                       ret = fileno(popen("tee aaaa", "w"));
+               }
+       }
+
+       printf("open(\"%s\", 0x%x, %o) -> %d\n", filename, flags, mode, ret);
+
+       return ret;
+}
+
+*/