Nano LD_PRELOAD wrapper

[mirrors/Programs.git] / c / cano / old / cano4.c

diff --git a/c/cano/old/cano4.c b/c/cano/old/cano4.c
new file mode 100644 (file)
index 0000000..69d0823
--- /dev/null
+++ b/c/cano/old/cano4.c
@@ -0,0 +1,128 @@
+#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>
+#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 pipe_read() {
+       /*
+       int pipefd[2];
+       pipe(pipefd);
+       if(!fork()) {
+               //write(pipefd[1],"ahoj\n",5);
+               syscall(SYS_write,pipefd[1],"ahoj\n",5);
+               close(pipefd[1]);
+               exit(0);
+       }
+       return pipefd[0];
+       */
+       return dup(fileno(popen("echo lolpajp", "r")));
+}
+int fdd;
+ssize_t read(int fd, void *buf, size_t count) {
+       fprintf(stderr,"%s(%d,%d,%s);\n",__func__,fd,count,fd_to_path(fd));
+       if(!fdd) fdd=pipe_read();
+       if(strcmp(fd_to_path(fd),"/usr/share/terminfo/x/xterm")!=0) {
+               return syscall(SYS_read,fdd,buf,count);
+       } else {
+               return syscall(SYS_read,fd,buf,count);
+       }
+}
+size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream) {
+       fprintf(stderr,"%s(%d,%d);\n",__func__,stream,fileno(stream));
+       return read(fileno(stream),ptr,size*nmemb);
+}
+/*
+ssize_t write(int fd, void *buf, size_t count) {
+       fprintf(stderr,"%s(%d,%d);\n",__func__,fd,count);
+       return syscall(SYS_write,fd,buf,count);
+}
+size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream) {
+       return write(fileno(stream),(void *)ptr,size*nmemb);
+}
+*/
+/*
+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 = fileno(popen("cat aaaa", "r"));
+               int pipefd[2];
+               pipe(pipefd);
+               ret = pipefd[0];
+               //ssize_t write(int fd, const void *buf, size_t count);
+               if(!fork()) { write(pipefd[1],"ahoj\n",5); close(pipefd[1]); exit(0); }
+       }
+
+       //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 = fileno(popen("cat aaaa", "r"));
+               int pipefd[2];
+               pipe(pipefd);
+               ret = pipefd[0];
+               //ssize_t write(int fd, const void *buf, size_t count);
+               if(!fork()) { write(pipefd[1],"ahoj\n",5); close(pipefd[1]); exit(0); }
+       }
+
+       //printf("open64(\"%s\", 0x%x, %o) -> %d\n", filename, flags, mode, ret);
+
+       return ret;
+}
+*/