radare2/libr/util/lib.c

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/* radare - LGPL - Copyright 2008-2014 - pancake */
#include "r_types.h"
#include "r_util.h"
#include "r_lib.h"
#include <stdio.h>
#include <dirent.h>
R_LIB_VERSION(r_lib);
/* TODO: support for nested plugins ?? here */
#if __UNIX__
#include <dlfcn.h>
#define DLOPEN(x) dlopen(x, RTLD_GLOBAL | RTLD_NOW)
#define DLSYM(x,y) dlsym(x,y)
#define DLCLOSE(x) dlclose(x)
#elif __WINDOWS__
#include <windows.h>
#define DLOPEN(x) LoadLibrary(x)
#define DLSYM(x,y) GetProcAddress(x,y)
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#define DLCLOSE(x) 0//(x)
//CloseLibrary(x)
#else
#define DLOPEN(x) NULL
#define DLSYM(x,y) NULL
#define DLCLOSE(x) NULL
#endif
/* XXX : this must be registered in runtime */
static const char *r_lib_types[] = {
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"io", "dbg", "lang", "asm", "anal", "parse", "bin", //"bininfo",
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"bp", "syscall", "fastcall", "crypto", "cmd", "egg", NULL
};
static int __has_debug = 0;
#define IFDBG if(__has_debug)
/* XXX: Rename this helper function */
R_API const char *r_lib_types_get(int idx) {
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if (idx < 0 || idx > R_LIB_TYPE_LAST-1)
return "unk";
return r_lib_types[idx];
}
R_API void *r_lib_dl_open(const char *libname) {
void *ret;
if (!libname || !*libname)
return NULL;
ret = DLOPEN (libname);
if (__has_debug && ret == NULL)
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#if __UNIX__
eprintf ("dlerror(%s): %s\n", libname, dlerror ());
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#else
eprintf ("r_lib_dl_open: Cannot open '%s'\n", libname);
#endif
return ret;
}
R_API void *r_lib_dl_sym(void *handler, const char *name) {
return DLSYM (handler, name);
}
R_API int r_lib_dl_close(void *handler) {
return DLCLOSE (handler);
}
/* ---- */
R_API char *r_lib_path(const char *libname) {
char *next, *path0, libpath[1024];
#if __APPLE__
char *env = r_sys_getenv ("DYLD_LIBRARY_PATH");
const char *ext = ".dylib";
env = r_str_concat (env, ":/lib:/usr/lib:/usr/local/lib");
#elif __UNIX__
char *env = r_sys_getenv ("LD_LIBRARY_PATH");
const char *ext = ".so";
env = r_str_concat (env, ":/lib:/usr/lib:/usr/local/lib");
#else
char *env = strdup (".:../../../../../../../windows/system32");
const char *ext = ".dll";
#endif
if (!env) env = strdup (".");
path0 = env;
do {
next = strchr (path0, ':');
if (next) *next = 0;
snprintf (libpath, sizeof (libpath), "%s/%s%s", path0, libname, ext);
//eprintf ("--> %s\n", libpath);
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if (r_file_exists (libpath)) {
free (env);
return strdup (libpath);
}
path0 = next+1;
} while (next);
free (env);
return NULL;
}
R_API RLib *r_lib_new(const char *symname) {
RLib *lib = R_NEW (RLib);
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char *env_debug;
if (lib) {
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env_debug = r_sys_getenv ("R_DEBUG");
__has_debug = env_debug ? R_TRUE : R_FALSE;
if (env_debug) {
free (env_debug);
}
lib->handlers = r_list_newf (free);
lib->plugins = r_list_newf (free);
strncpy (lib->symname, symname, sizeof (lib->symname)-1);
}
return lib;
}
R_API RLib *r_lib_free(RLib *lib) {
if (!lib) return NULL;
r_lib_close (lib, NULL);
r_list_free (lib->handlers);
r_list_free (lib->plugins);
free (lib);
return NULL;
}
/* THIS IS WRONG */
R_API int r_lib_dl_check_filename(const char *file) {
if (strstr (file, "."R_LIB_EXT))
return R_TRUE;
return R_FALSE;
}
/* high level api */
R_API int r_lib_run_handler(RLib *lib, RLibPlugin *plugin, RLibStruct *symbol) {
RLibHandler *h = plugin->handler;
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if (h && h->constructor) {
IFDBG eprintf ("PLUGIN HANDLER %p %p\n", h, h->constructor);
return h->constructor (plugin, h->user, symbol->data);
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} else IFDBG eprintf ("Cannot find plugin constructor\n");
return R_FAIL;
}
R_API RLibHandler *r_lib_get_handler(RLib *lib, int type) {
RLibHandler *h;
RListIter *iter;
r_list_foreach (lib->handlers, iter, h) {
if (h->type == type)
return h;
}
return NULL;
}
R_API R_API int r_lib_close(RLib *lib, const char *file) {
RLibPlugin *p;
RListIter *iter;
/* No _safe loop necessary because we return immediately after the delete. */
r_list_foreach (lib->plugins, iter, p) {
if ((file==NULL || (!strcmp (file, p->file)))) {
int ret = 0;
if (p->handler && p->handler->constructor) {
ret = p->handler->destructor (p,
p->handler->user, p->data);
}
free (p->file);
r_list_delete (lib->plugins, iter);
return ret;
}
}
// delete similar plugin name
r_list_foreach (lib->plugins, iter, p) {
if (strstr (p->file, file)) {
int ret = 0;
if (p->handler && p->handler->constructor) {
ret = p->handler->destructor (p,
p->handler->user, p->data);
}
eprintf ("Unloaded %s\n", p->file);
free (p->file);
r_list_delete (lib->plugins, iter);
return ret;
}
}
return -1;
}
// XXX ugly hack ?
static int samefile(const char *a, const char *b) {
char *sa = strdup (a);
char *sb = strdup (b);
char *ptr;
int len, ret = R_FALSE;
if (sa != NULL && sb != NULL) {
do {
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ptr = strstr (sa, "//");
if (ptr) {
len = strlen (ptr+1) + 1;
memmove (ptr, ptr+1, len);
}
} while (ptr);
do {
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ptr = strstr (sb, "//");
if (ptr) {
len = strlen (ptr+1) + 1;
memmove (ptr, ptr+1, len);
}
} while (ptr);
ret = strcmp (sa,sb)? R_FALSE: R_TRUE;
}
free (sa);
free (sb);
return ret;
}
R_API int r_lib_open(RLib *lib, const char *file) {
RLibPlugin *p;
RListIter *iter;
RLibStruct *stru;
void *handler;
int ret = R_FALSE;
/* ignored by filename */
if (!r_lib_dl_check_filename (file)) {
eprintf ("Invalid library extension: %s\n", file);
return R_FAIL;
}
handler = r_lib_dl_open (file);
if (handler == NULL) {
IFDBG eprintf ("Cannot open library: '%s'\n", file);
return R_FAIL;
}
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stru = (RLibStruct *) r_lib_dl_sym (handler, lib->symname);
if (stru == NULL) {
IFDBG eprintf ("Cannot find symbol '%s' in library '%s'\n",
lib->symname, file);
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r_lib_dl_close (handler);
return R_FAIL;
}
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// TODO: Use Sdb here. just a single line
r_list_foreach (lib->plugins, iter, p) {
if (samefile (file, p->file)) {
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IFDBG eprintf ("Dupped\n");
r_lib_dl_close (handler);
return R_FAIL;
}
}
p = R_NEW0 (RLibPlugin);
p->type = stru->type;
p->data = stru->data;
p->file = strdup (file);
p->dl_handler = handler;
p->handler = r_lib_get_handler (lib, p->type);
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ret = r_lib_run_handler (lib, p, stru);
if (ret == R_FAIL) {
IFDBG eprintf ("Library handler has failed for '%s'\n", file);
free (p->file);
free (p);
r_lib_dl_close (handler);
} else r_list_append (lib->plugins, p);
return ret;
}
R_API int r_lib_opendir(RLib *lib, const char *path) {
char file[1024];
struct dirent *de;
DIR *dh;
#ifdef LIBR_PLUGINS
if (path == NULL)
path = LIBR_PLUGINS;
#endif
if (path == NULL)
return R_FALSE;
dh = opendir (path);
if (dh == NULL) {
IFDBG eprintf ("Cannot open directory '%s'\n", path);
return R_FALSE;
}
while ((de = (struct dirent *)readdir (dh))) {
snprintf (file, sizeof (file), "%s/%s", path, de->d_name);
if (r_lib_dl_check_filename (file))
r_lib_open (lib, file);
}
closedir (dh);
return R_TRUE;
}
R_API int r_lib_add_handler(RLib *lib,
int type, const char *desc,
int (*cb)(RLibPlugin *, void *, void *), /* constructor */
int (*dt)(RLibPlugin *, void *, void *), /* destructor */
void *user)
{
RLibHandler *h;
RListIter *iter;
RLibHandler *handler = NULL;
r_list_foreach (lib->handlers, iter, h) {
if (type == h->type) {
IFDBG eprintf ("Redefining library handler constructor for %d\n", type);
handler = h;
break;
}
}
if (handler == NULL) {
handler = R_NEW (RLibHandler);
if (handler == NULL)
return R_FALSE;
handler->type = type;
r_list_append (lib->handlers, handler);
}
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strncpy (handler->desc, desc, sizeof (handler->desc)-1);
handler->user = user;
handler->constructor = cb;
handler->destructor = dt;
return R_TRUE;
}
R_API int r_lib_del_handler(RLib *lib, int type) {
RLibHandler *h;
RListIter *iter;
// TODO: remove all handlers for that type? or only one?
/* No _safe loop necessary because we return immediately after the delete. */
r_list_foreach (lib->handlers, iter, h) {
if (type == h->type) {
r_list_delete (lib->handlers, iter);
return R_TRUE;
}
}
return R_FALSE;
}
R_API void r_lib_list(RLib *lib) {
RListIter *iter;
RLibPlugin *p;
r_list_foreach (lib->plugins, iter, p) {
printf (" %5s %p %s \n", r_lib_types_get (p->type),
p->dl_handler, p->file);
}
}