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#include <stdio.h>
#include "symbol_enumerator.h"
#if defined( WIN32 ) || defined( WINDOWS ) || defined( USE_WINDOWS ) || defined( _WIN32 )
#include <windows.h>
#include <dbghelp.h>
BOOL CALLBACK mycb(PSYMBOL_INFO pSymInfo, ULONG SymbolSize, PVOID UserContext) {
SymEnumeratorCallback cb = (SymEnumeratorCallback)UserContext;
return !cb("", &pSymInfo->Name[0], (void *)pSymInfo->Address, (long)pSymInfo->Size);
}
int EnumerateSymbols( SymEnumeratorCallback cb )
{
HANDLE proc = GetCurrentProcess();
if( !SymInitialize( proc, 0, 1 ) ) return -1;
if( !SymEnumSymbols( proc, 0, "*!*", &mycb, (void*)cb ) )
{
fprintf(stderr, "SymEnumSymbols returned %d\n", GetLastError());
SymCleanup(proc);
return -2;
}
SymCleanup(proc);
return 0;
}
#else
#include <stdio.h>
#include <dlfcn.h>
#include <stdint.h>
#include <limits.h>
#include <string.h>
#ifndef __GNUC__
#define __int128_t long long long
#endif
#include <link.h>
#include <elf.h>
#define UINTS_PER_WORD (__WORDSIZE / (CHAR_BIT * sizeof (unsigned int)))
struct dl_phdr_info {
ElfW(Addr) dlpi_addr; /* Base address of object */
const char *dlpi_name; /* (Null-terminated) name of
object */
const ElfW(Phdr) *dlpi_phdr; /* Pointer to array of
ELF program headers
for this object */
ElfW(Half) dlpi_phnum; /* # of items in dlpi_phdr */
};
void dl_iterate_phdr( void*, void*);
static ElfW(Word) gnu_hashtab_symbol_count(const unsigned int *const table)
{
const unsigned int *const bucket = table + 4 + table[2] * (unsigned int)(UINTS_PER_WORD);
unsigned int b = table[0];
unsigned int max = 0U;
while (b-->0U)
if (bucket[b] > max)
max = bucket[b];
return (ElfW(Word))max;
}
static static void *dynamic_pointer(const ElfW(Addr) addr,
const ElfW(Addr) base, const ElfW(Phdr) *const header, const ElfW(Half) headers)
{
if (addr) {
ElfW(Half) h;
for (h = 0; h < headers; h++)
if (header[h].p_type == PT_LOAD)
if (addr >= base + header[h].p_vaddr &&
addr < base + header[h].p_vaddr + header[h].p_memsz)
return (void *)addr;
}
return NULL;
}
//Mostly based off of http://stackoverflow.com/questions/29903049/get-names-and-addresses-of-exported-functions-from-in-linux
static int callback(struct dl_phdr_info *info,
size_t size, void *data)
{
SymEnumeratorCallback cb = (SymEnumeratorCallback)data;
const ElfW(Addr) base = info->dlpi_addr;
const ElfW(Phdr) *const header = info->dlpi_phdr;
const ElfW(Half) headers = info->dlpi_phnum;
const char *libpath, *libname;
ElfW(Half) h;
if (info->dlpi_name && info->dlpi_name[0])
libpath = info->dlpi_name;
else
libpath = "";
libname = strrchr(libpath, '/');
if (libname && libname[0] == '/' && libname[1])
libname++;
else
libname = libpath;
for (h = 0; h < headers; h++)
{
if (header[h].p_type == PT_DYNAMIC)
{
const ElfW(Dyn) *entry = (const ElfW(Dyn) *)(base + header[h].p_vaddr);
const ElfW(Word) *hashtab;
const ElfW(Sym) *symtab = NULL;
const char *strtab = NULL;
ElfW(Word) symbol_count = 0;
for (; entry->d_tag != DT_NULL; entry++)
{
switch (entry->d_tag)
{
case DT_HASH:
hashtab = dynamic_pointer(entry->d_un.d_ptr, base, header, headers);
if (hashtab)
symbol_count = hashtab[1];
break;
case DT_GNU_HASH:
hashtab = dynamic_pointer(entry->d_un.d_ptr, base, header, headers);
if (hashtab)
{
ElfW(Word) count = gnu_hashtab_symbol_count(hashtab);
if (count > symbol_count)
symbol_count = count;
}
break;
case DT_STRTAB:
strtab = dynamic_pointer(entry->d_un.d_ptr, base, header, headers);
break;
case DT_SYMTAB:
symtab = dynamic_pointer(entry->d_un.d_ptr, base, header, headers);
break;
}
}
if (symtab && strtab && symbol_count > 0) {
ElfW(Word) s;
for (s = 0; s < symbol_count; s++) {
const char *name;
void *const ptr = dynamic_pointer(base + symtab[s].st_value, base, header, headers);
int result;
if (!ptr)
continue;
if (symtab[s].st_name)
name = strtab + symtab[s].st_name;
else
name = "";
result = cb( libpath, name, ptr, symtab[s].st_size );
if( result ) return result; //Bail early.
}
}
}
}
return 0;
}
int EnumerateSymbols( SymEnumeratorCallback cb )
{
dl_iterate_phdr( callback, cb );
}
#endif
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