Commit | Line | Data |
---|---|---|
d3b2d1a7 TM |
1 | #define _GNU_SOURCE |
2 | /* | |
3 | #include <stdlib.h> | |
4 | #include <sys/types.h> | |
5 | #include <unistd.h> | |
6 | #include <stdarg.h> | |
7 | #include <time.h> | |
8 | #include <string.h> | |
9 | ||
10 | #include <sys/types.h> | |
11 | #include <sys/stat.h> | |
12 | #include <fcntl.h> | |
13 | */ | |
14 | #include <dlfcn.h> | |
15 | #include <stdio.h> | |
16 | #include <sys/syscall.h> | |
17 | #include <linux/limits.h> | |
18 | ||
19 | #define i { srand(23); fprintf(stderr,"%s();\n",__func__); } | |
20 | //Catch open() calls (while redirecting filename): | |
21 | ||
22 | static const char *fd_to_path(int fd) { | |
23 | static char path[PATH_MAX]; | |
24 | sprintf(path,"/proc/self/fd/%d",fd); | |
25 | int l = (int) readlink((char * __restrict__) path, path, PATH_MAX); | |
26 | path[l]=0; | |
27 | return path; | |
28 | } | |
29 | ||
30 | int close(int fd) { | |
31 | //fputs(fd_to_path(fd),stderr); | |
32 | fprintf(stderr,"%s(%d,%s);\n",__func__,fd,fd_to_path(fd)); | |
33 | if(fd>2) return syscall(SYS_close,fd); | |
34 | } | |
35 | int fclose(FILE *fd) { | |
36 | //fputs(fd_to_path(fd),stderr); | |
37 | fprintf(stderr,"%s(%d,%d,%s);\n",__func__,fileno(fd),fd,fd_to_path(fileno(fd))); | |
38 | static ssize_t (*fclose_orig)(FILE *fd); | |
39 | if (!fclose_orig) { | |
40 | fclose_orig = dlsym(RTLD_NEXT, "fclose"); | |
41 | } | |
42 | return fclose_orig(fd); | |
43 | //return syscall(SYS_close,fileno(fd)); | |
44 | } | |
45 | /* | |
46 | ssize_t write(int fd, const void *buf, size_t count) { | |
47 | //fputs(fd_to_path(fd),stderr); | |
48 | printf("%d",fd); | |
49 | i; | |
50 | return syscall(SYS_write,fd,buf,count); | |
51 | } | |
52 | */ | |
53 | /* | |
54 | static const char *redirect_name(const char *name) | |
55 | { | |
56 | if( | |
57 | (strcmp(name,"/dev/random") == 0) || | |
58 | (strcmp(name,"/dev/urandom") == 0) | |
59 | ) { | |
60 | printf("REDIRECT HIT: %s\n", name); | |
61 | return "/dev/zero"; | |
62 | } | |
63 | return name; | |
64 | } | |
65 | ||
66 | ||
67 | int open(const char *filename, int flags, ...) | |
68 | { | |
69 | //srand(23); | |
70 | static int (*open_orig)(const char *, int, mode_t); | |
71 | int ret; | |
72 | va_list ap; | |
73 | mode_t mode; | |
74 | ||
75 | if (!open_orig) { | |
76 | open_orig = dlsym(RTLD_NEXT, "open"); | |
77 | } | |
78 | ||
79 | va_start(ap, flags); | |
80 | mode = va_arg(ap, mode_t); | |
81 | va_end(ap); | |
82 | ||
83 | if(strcmp(filename,"/tmp/lol.txt.asc") != 0) { | |
84 | ret = open_orig(redirect_name(filename), flags, mode); | |
85 | //ret = syscall(SYS_open,redirect_name(filename),flags,mode); | |
86 | } else { | |
87 | if(flags & O_RDONLY) { | |
88 | ret = fileno(popen("cat aaaa", "r")); | |
89 | } else { | |
90 | ret = fileno(popen("tee aaaa", "w")); | |
91 | } | |
92 | } | |
93 | ||
94 | printf("open(\"%s\", 0x%x, %o) -> %d\n", filename, flags, mode, ret); | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | */ |