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new.c

Generates a new ELF binary with a few different types of sections.

#include <stdlib.h>
#include <stdio.h>

#include "melf.h"

int main(int argc, char **argv)
{
        ELF_SPEC_HEADER *curr, *sym;
        MELF *melf = melf_new();

        if (!melf)
                return 0;

        fprintf(stdout, "creating new elf img called 'blank'...\n");

        melf_elfSetType(melf, ET_EXEC);
        melf_elfSetMachine(melf, EM_386);

        if ((curr = melf_sectionAdd(melf)))
        {
                melf_sectionSetName(melf, curr, "test-section");
                melf_sectionSetType(melf, curr, SHT_NOBITS);
        }
        
        if ((curr = melf_sectionAdd(melf)))
        {
                melf_sectionSetName(melf, curr, "bobby");
                melf_sectionSetType(melf, curr, SHT_NOBITS);
        }

        // Add a dynamic section
        
        if ((curr = melf_dynamicCreate(melf)))
        {
                ELF_SPEC_HEADER *dynstr = melf_sectionGetStringTableHeader(melf, curr);
                unsigned long index = 0;

                // Add DT_NEEDED for libc.
                if (dynstr)
                        index = melf_stringTableSetString(melf, dynstr, "/lib/libc.so.6");

                melf_dynamicAddTag(melf, curr, DT_NEEDED, index);
        }

        // Add a note section

        if ((curr = melf_noteCreate(melf, ".note", 1)))
        {
                melf_noteAdd(melf, curr, 1, "hi", "testing", 8);
                melf_noteAdd(melf, curr, 0, "NAME", "DESC", 5);
                melf_noteAdd(melf, curr, 1, "JANE", "DESCZ", 5);
        }

        // Add a symbol table
        
        if ((curr = sym = melf_symbolTableCreate(melf, ".symtab")))
        {
                Elf32_Sym *sym = melf_symbolTableAddSymbol(melf, curr, "tester");
                sym = melf_symbolTableAddSymbol(melf, curr, "shutup");

                melf_symbolSetType(melf, curr, sym, STT_OBJECT);
                melf_symbolSetBinding(melf, curr, sym, STB_GLOBAL);
        }

        // Reloc table
        if ((curr = melf_relocTableCreate(melf, ".rel", 0)))
        {
                Elf32_Rel *rel = melf_relocTableAddRel(melf, curr);
                melf_relocRelInitialize(melf, curr, rel, 0x41, 1, 1);
                
                rel = melf_relocTableAddRel(melf, curr);
                melf_relocRelInitialize(melf, curr, rel, 0x4411, 2, 2);
                
                rel = melf_relocTableAddRel(melf, curr);
                melf_relocRelInitialize(melf, curr, rel, 0x4411, 8, 0);

                melf_relocTableRemoveRel(melf, curr, melf_relocTableEnumRel(melf, curr, 1));

                melf_relocTableSetSymbolTableHeader(melf, curr, sym);
        }

        // Reloc addend table
        if ((curr = melf_relocTableCreate(melf, ".rela", 1)))
        {
                Elf32_Rela *rela = melf_relocTableAddRela(melf, curr);

                melf_relocRelaInitialize(melf, curr, rela, 0x41, 1, 1, 0xffff);

                rela = melf_relocTableAddRela(melf, curr);
                melf_relocRelaInitialize(melf, curr, rela, 0x4441, 1, 2, 0xfffe);
                
                rela = melf_relocTableAddRela(melf, curr);
                melf_relocRelaInitialize(melf, curr, rela, 0x4444, 7, 3, 0xfffe);

                melf_relocTableRemoveRela(melf, curr, melf_relocTableEnumRela(melf, curr, 1));

                melf_relocTableSetSymbolTableHeader(melf, curr, sym);
        }

        melf_save(melf, "blank");

        melf_destroy(melf);

        return 1;
}

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