Fixing Scansnap's code

omg.c

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <mach/mach.h>
#include <mach/mach_vm.h>
#include <assert.h>
#include <unistd.h>

__attribute__((constructor)) static void patch_assert() {
    printf("test test \n");
    if (strcmp(getprogname(), "Scan to Evernote2") != 0) { return; }
    char *out_path = getenv("DS_TTY");
    if (!out_path) { printf("Expects you to set DS_TTY env var for Terminal\n"); return; }
    
    int fd = open(out_path, O_WRONLY);
    if (fd) { return; }
    
    dprintf(fd, "We're live calling from proc %d\n", getpid());
    
    vm_address_t addr = (vm_address_t)__assert_rtn;
    
    
    
    dprintf(fd, "__assert_rtn address found: %p\n", (void*)addr);
    
    kern_return_t k = mach_vm_protect(mach_task_self(), addr, 1, FALSE, VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
    assert(k == KERN_SUCCESS);

    
    char data = 0xc3;
    k = mach_vm_write(mach_task_self(), addr, (vm_offset_t)&data, sizeof(char));
    mach_error("err ", k);
    assert(k == KERN_SUCCESS);
    
    dprintf(fd, "patching address: %p\n", (void*)addr);
    
    k = mach_vm_msync(mach_task_self(), addr, 1, VM_SYNC_SYNCHRONOUS|VM_SYNC_INVALIDATE);
    assert(k == KERN_SUCCESS);
}