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/*
* The MIT License (MIT)
*
* Copyright © 2016 Franklin "Snaipe" Mathieu <http://snai.pe/>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <windows.h>
#include <tlhelp32.h>
#include "err.h"
#include "section.h"
int section_getaddr(HMODULE mod, const char *sectname,
struct cri_section *sect)
{
PIMAGE_DOS_HEADER dos_hdr = (PIMAGE_DOS_HEADER) mod;
PIMAGE_NT_HEADERS nt_hdr = (PIMAGE_NT_HEADERS) ((uintptr_t) dos_hdr
+ dos_hdr->e_lfanew);
PIMAGE_SECTION_HEADER sec_hdr = IMAGE_FIRST_SECTION(nt_hdr);
for (int i = 0; i < nt_hdr->FileHeader.NumberOfSections; i++, sec_hdr++) {
if (*(char *) sec_hdr == '/')
continue;
if (!strncmp((char *) sec_hdr->Name, sectname, IMAGE_SIZEOF_SHORT_NAME)) {
sect->length = sec_hdr->SizeOfRawData;
sect->addr = (char *) dos_hdr + sec_hdr->VirtualAddress;
return 1;
}
}
return 0;
}
int cri_sections_getaddr(const char *sectname, struct cri_section **out)
{
struct cri_section *sect = malloc(sizeof (struct cri_section) * 3);
if (!sect)
cr_panic("Could not allocate cri_section");
sect[0].addr = NULL;
size_t i = 0;
size_t size = 2;
HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE,
GetCurrentProcessId());
if (snap == INVALID_HANDLE_VALUE)
cr_panic("CreateToolhelp32Snapshot returned INVALID_HANDLE_VALUE");
MODULEENTRY32 mod = { .dwSize = sizeof (MODULEENTRY32) };
for (BOOL more = Module32First(snap, &mod); more;
more = Module32Next(snap, &mod)) {
struct cri_section s;
if (!section_getaddr(mod.hModule, sectname, &s))
continue;
if (i >= size) {
size *= 1.5f;
sect = realloc(sect, sizeof (struct cri_section) * (size + 1));
if (!sect)
cr_panic("Could not allocate cri_section");
}
sect[i] = s;
sect[i + 1].addr = NULL;
++i;
}
unsigned long err = (unsigned long) GetLastError();
if (err != ERROR_NO_MORE_FILES)
cr_panic("Error %lu while iterating modules", err);
*out = sect;
return 0;
}
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