64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
#pragma once
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#include <unistd.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <elf.h>
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#include <link.h>
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#include "log.h"
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#include "exec.h"
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// Find And Iterate Over All .text Sections In Current Binary
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typedef void (*text_section_callback_t)(ElfW(Addr) section, ElfW(Word) size, void *data);
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static inline void iterate_text_sections(text_section_callback_t callback, void *data) {
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// Load Main Binary
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FILE *file_obj = fopen("/proc/self/exe", "rb");
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// Verify Binary
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if (!file_obj) {
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ERR("%s", "Unable To Open Current Binary");
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}
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// Get File Size
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fseek(file_obj, 0L, SEEK_END);
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long int file_size = ftell(file_obj);
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fseek(file_obj, 0L, SEEK_SET);
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// Map File To Pointer
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unsigned char *file_map = (unsigned char *) mmap(0, file_size, PROT_READ, MAP_PRIVATE, fileno(file_obj), 0);
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// Parse ELF
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ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_map;
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ElfW(Shdr) *elf_section_headers = (ElfW(Shdr) *) (file_map + elf_header->e_shoff);
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int elf_section_header_count = elf_header->e_shnum;
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// Locate Section Names
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ElfW(Shdr) elf_shstrtab = elf_section_headers[elf_header->e_shstrndx];
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unsigned char *elf_shstrtab_p = file_map + elf_shstrtab.sh_offset;
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// Track .text Sections
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int text_sections = 0;
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// Iterate Sections
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for (int i = 0; i < elf_section_header_count; ++i) {
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ElfW(Shdr) header = elf_section_headers[i];
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char *name = (char *) (elf_shstrtab_p + header.sh_name);
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// Check Section Type
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if (strcmp(name, ".text") == 0) {
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// .text Section
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(*callback)(header.sh_addr, header.sh_size, data);
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text_sections++;
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}
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}
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// Ensure At Least .text Section Was Scanned
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if (text_sections < 1) {
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ERR("%s", "Unable To Find .text Sectons");
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}
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// Unmap And Close File
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munmap(file_map, file_size);
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fclose(file_obj);
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}
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