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/*
* Copyright 2011 Red Hat, Inc.
*
* 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.
*/
#ifdef WIN32
#include <windows.h>
#define dlltype HMODULE
static char *
dllerror(void) {
char *amsg;
LPTSTR msg;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &msg, 0, NULL);
amsg = strdup((const char*) msg);
LocalFree(msg);
return amsg;
}
#elif defined(aix)
#include "sys/ldr.h"
struct Dl_info {
const char* dli_fname;
};
static int
dladdr(void* s, Dl_info* i)
{
static const size_t bufSize = 4096;
G__FastAllocString buf(bufSize);
char* pldi = buf;
int r;
r = loadquery(L_GETINFO, pldi, bufSize);
if (r == -1) {
i->dli_fname = NULL;
return 0;
}
for (ld_info* ldi = (ld_info*) buf;
ldi->ldinfo_next;
ldi += ldi->ldinfo_next) {
char* textBegin = (char*) ldi->ldinfo_textorg;
if (textBegin < s) {
char* textEnd = textBegin + ldi->ldinfo_textsize;
if (textEnd > s) {
i->dli_fname = ldi->ldinfo_filename;
return 1;
}
}
}
// First is main(), skip.
ld_info* ldi = (ld_info*) pldi;
while (ldi->ldinfo_next) {
pldi += ldi->ldinfo_next;
ldi = (ld_info*) pldi;
}
i->dli_fname = NULL;
return 0;
}
#else
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#define dlltype void *
#define dllerror() strdup(dlerror())
#endif
int
module_symbol_is_present(const char *modname, const char *symbname)
{
#ifdef WIN32
return (GetProcAddress(GetModuleHandle(modname), symbname) != NULL ||
GetProcAddress(GetModuleHandle(NULL), symbname) != NULL);
#else /* WIN32 */
void* mod = dlopen(NULL, RTLD_LAZY | RTLD_LOCAL);
if (mod) {
void* sym = dlsym(mod, symbname);
dlclose(mod);
return sym != NULL;
}
#endif /* WIN32 */
return 0;
}
int
module_get_filename_for_symbol(void *addr, char **filename)
{
#ifdef WIN32
MEMORY_BASIC_INFORMATION info;
HMODULE mod;
char tmp[MAX_PATH];
if (!VirtualQuery(addr, &info, sizeof(info)))
return 0;
mod = (HMODULE) info.AllocationBase;
if (!GetModuleFileNameA(mod, tmp, MAX_PATH))
return 0;
#else
const char *tmp;
Dl_info dlinfo;
if (!dladdr(addr, &dlinfo))
return 0;
tmp = dlinfo.dli_fname;
#endif
if (filename) {
*filename = strdup(tmp);
if (!*filename)
return 0;
}
return 1;
}
void
module_close(void *dll)
{
if (!dll)
return;
#ifdef WIN32
FreeLibrary((dlltype) dll);
#else /* WIN32 */
dlclose((dlltype) dll);
#endif /* WIN32 */
}
char *
module_load(const char *filename, const char *symbname,
int (*shouldload)(void *symb, void *misc, char **err), void *misc,
void **dll, void **symb)
{
dlltype intdll = NULL;
void * intsym = NULL;
char * interr = NULL;
if (dll)
*dll = NULL;
if (symb)
*symb = NULL;
/* Open the module library */
#ifdef WIN32
/* NOTE: DONT_RESOLVE_DLL_REFERENCES is evil. Don't use this in your own
* code. However, our design pattern avoids all the issues surrounding a
* more general use of this evil flag. */
intdll = LoadLibraryEx(filename, NULL, DONT_RESOLVE_DLL_REFERENCES);
#else /* WIN32 */
intdll = dlopen(filename, RTLD_LAZY | RTLD_LOCAL);
#endif /* WIN32 */
if (!intdll)
return dllerror();
/* Get the module symbol */
#ifdef WIN32
intsym = (void *) GetProcAddress(intdll, symbname);
#else /* WIN32 */
intsym = dlsym(intdll, symbname);
#endif /* WIN32 */
if (!intsym) {
module_close(intdll);
return dllerror();
}
/* Figure out whether or not to load this module */
if (!shouldload(intsym, misc, &interr)) {
module_close(intdll);
return interr;
}
/* Re-open the module */
module_close(intdll);
#ifdef WIN32
intdll = LoadLibrary(filename);
#else /* WIN32 */
intdll = dlopen(filename, RTLD_NOW | RTLD_LOCAL);
#endif /* WIN32 */
if (!intdll) {
return dllerror();
}
/* Get the symbol again */
#ifdef WIN32
intsym = (void *) GetProcAddress(intdll, symbname);
#else /* WIN32 */
intsym = dlsym(intdll, symbname);
#endif /* WIN32 */
if (!intsym) {
module_close(intdll);
return dllerror();
}
if (dll)
*dll = intdll;
if (symb)
*symb = intsym;
return NULL;
}
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