fs

fs class exposes functions from wrapped libc api, such as popen etc. and allows file manipulation.

Table of contents

• fclose
• fgets
• fileno
• fopen
• fputs
• getline
• popen
• pclose
• allocateRw
• readStringFromFile
• readStringFromFp
• writeStringToFile

fclose

fgets

fileno

fopen

fputs

getline

popen

pclose

// real example from base library
// both accept path and perm as string in params
var f = fs.fopen(kernel.ftrace.PATH_TRACE, 'r');
var buf = fs.allocateRw(Process.pointerSize);
var len = fs.allocateRw(Process.pointerSize);
var read;
var lines = "";
while ((read = fs.getline(buf, len, f)) !== -1) {
    lines += Memory.readUtf8String(Memory.readPointer(buf));
}
fs.fclose(f);

allocateRw

var buf = fs.allocateRw(1024);

allocate memory in the heap with read and write perm

readStringFromFile

var available_options = fs.readStringFromFile(this.PATH_OPTIONS).split('\n');

read the whole content of a file path and return it’s content as string

readStringFromFp

read the whole content of a file pointer (from fopen i.e) and return it’s content as string

writeStringToFile

fs.writeStringToFile("/path/to/file", "content");

write the content of arg1 in the path specified in arg0. Eventually, you can pass a third param boolean to append the content to an existing file