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library.c
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library.c
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/*
* This file is part of ltrace.
* Copyright (C) 2011,2012,2013,2014 Petr Machata, Red Hat Inc.
* Copyright (C) 2001,2009 Juan Cespedes
* Copyright (C) 2006 Ian Wienand
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include "library.h"
#include "callback.h"
#include "debug.h"
#include "dict.h"
#include "vect.h"
#include "backend.h" // for arch_library_symbol_init, arch_library_init
static void
library_exported_names_init(struct library_exported_names *names);
#ifndef OS_HAVE_LIBRARY_DATA
int
os_library_init(struct library *lib)
{
return 0;
}
void
os_library_destroy(struct library *lib)
{
}
int
os_library_clone(struct library *retp, struct library *lib)
{
return 0;
}
#endif
#ifndef ARCH_HAVE_LIBRARY_DATA
int
arch_library_init(struct library *lib)
{
return 0;
}
void
arch_library_destroy(struct library *lib)
{
}
int
arch_library_clone(struct library *retp, struct library *lib)
{
return 0;
}
#endif
#ifndef OS_HAVE_LIBRARY_SYMBOL_DATA
int
os_library_symbol_init(struct library_symbol *libsym)
{
return 0;
}
void
os_library_symbol_destroy(struct library_symbol *libsym)
{
}
int
os_library_symbol_clone(struct library_symbol *retp,
struct library_symbol *libsym)
{
return 0;
}
#endif
#ifndef ARCH_HAVE_LIBRARY_SYMBOL_DATA
int
arch_library_symbol_init(struct library_symbol *libsym)
{
return 0;
}
void
arch_library_symbol_destroy(struct library_symbol *libsym)
{
}
int
arch_library_symbol_clone(struct library_symbol *retp,
struct library_symbol *libsym)
{
return 0;
}
#endif
size_t
arch_addr_hash(const arch_addr_t *addr)
{
union {
arch_addr_t addr;
int ints[sizeof(arch_addr_t)
/ sizeof(unsigned int)];
} u = { .addr = *addr };
size_t i;
size_t h = 0;
for (i = 0; i < sizeof(u.ints) / sizeof(*u.ints); ++i)
h ^= dict_hash_int(&u.ints[i]);
return h;
}
int
arch_addr_eq(const arch_addr_t *addr1, const arch_addr_t *addr2)
{
return *addr1 == *addr2;
}
int
strdup_if(const char **retp, const char *str, int whether)
{
if (whether && str != NULL) {
str = strdup(str);
if (str == NULL)
return -1;
}
*retp = str;
return 0;
}
static void
private_library_symbol_init(struct library_symbol *libsym,
arch_addr_t addr,
const char *name, int own_name,
enum toplt type_of_plt,
int latent, int delayed)
{
libsym->next = NULL;
libsym->lib = NULL;
libsym->plt_type = type_of_plt;
libsym->name = name;
libsym->own_name = own_name;
libsym->latent = latent;
libsym->delayed = delayed;
libsym->enter_addr = (void *)(uintptr_t)addr;
libsym->proto = NULL;
}
static void
private_library_symbol_destroy(struct library_symbol *libsym)
{
library_symbol_set_name(libsym, NULL, 0);
}
int
library_symbol_init(struct library_symbol *libsym,
arch_addr_t addr, const char *name, int own_name,
enum toplt type_of_plt)
{
private_library_symbol_init(libsym, addr, name, own_name,
type_of_plt, 0, 0);
if (os_library_symbol_init(libsym) < 0)
/* We've already set libsym->name and own_name. But
* we return failure, and the client code isn't
* supposed to call library_symbol_destroy in such
* case. */
return -1;
if (arch_library_symbol_init(libsym) < 0) {
os_library_symbol_destroy(libsym);
return -1;
}
return 0;
}
void
library_symbol_destroy(struct library_symbol *libsym)
{
if (libsym != NULL) {
arch_library_symbol_destroy(libsym);
os_library_symbol_destroy(libsym);
private_library_symbol_destroy(libsym);
}
}
int
library_symbol_clone(struct library_symbol *retp, struct library_symbol *libsym)
{
/* Make lifetimes of name stored at original independent of
* the one at the clone. */
const char *name;
if (strdup_if(&name, libsym->name, libsym->own_name) < 0)
return -1;
private_library_symbol_init(retp, libsym->enter_addr,
name, libsym->own_name, libsym->plt_type,
libsym->latent, libsym->delayed);
if (os_library_symbol_clone(retp, libsym) < 0) {
fail:
private_library_symbol_destroy(retp);
return -1;
}
if (arch_library_symbol_clone(retp, libsym) < 0) {
os_library_symbol_destroy(retp);
goto fail;
}
return 0;
}
int
library_symbol_cmp(struct library_symbol *a, struct library_symbol *b)
{
if (a->enter_addr < b->enter_addr)
return -1;
if (a->enter_addr > b->enter_addr)
return 1;
if (a->name != NULL && b->name != NULL)
return strcmp(a->name, b->name);
if (a->name == NULL) {
if (b->name == NULL)
return 0;
return -1;
}
return 1;
}
void
library_symbol_set_name(struct library_symbol *libsym,
const char *name, int own_name)
{
if (libsym->own_name)
free((char *)libsym->name);
libsym->name = name;
libsym->own_name = own_name;
}
enum callback_status
library_symbol_equal_cb(struct library_symbol *libsym, void *u)
{
struct library_symbol *standard = u;
return library_symbol_cmp(libsym, standard) == 0 ? CBS_STOP : CBS_CONT;
}
enum callback_status
library_symbol_named_cb(struct library_symbol *libsym, void *name)
{
return strcmp(libsym->name, name) == 0 ? CBS_STOP : CBS_CONT;
}
enum callback_status
library_symbol_delayed_cb(struct library_symbol *libsym, void *unused)
{
return libsym->delayed ? CBS_STOP : CBS_CONT;
}
static void
private_library_init(struct library *lib, enum library_type type)
{
lib->next = NULL;
lib->key = 0;
lib->base = 0;
lib->entry = 0;
lib->dyn_addr = 0;
lib->protolib = NULL;
lib->soname = NULL;
lib->own_soname = 0;
lib->pathname = NULL;
lib->own_pathname = 0;
lib->symbols = NULL;
library_exported_names_init(&lib->exported_names);
lib->should_activate_latent = false;
lib->type = type;
#if defined(HAVE_LIBDW)
lib->dwfl_module = NULL;
#endif
}
int
library_init(struct library *lib, enum library_type type)
{
private_library_init(lib, type);
if (os_library_init(lib) < 0)
return -1;
if (arch_library_init(lib) < 0) {
os_library_destroy(lib);
return -1;
}
return 0;
}
static void dtor_string(const char **tgt, void *data)
{
free((char*)*tgt);
}
static int clone_vect(struct vect **to, const struct vect **from, void *data)
{
*to = malloc(sizeof(struct vect));
if (*to == NULL)
return -1;
return
VECT_CLONE(*to, *from, const char*,
dict_clone_string,
dtor_string,
NULL);
}
static void dtor_vect(struct vect **tgt, void *data)
{
VECT_DESTROY(*tgt, const char*, dtor_string, NULL);
free(*tgt);
}
static void
library_exported_names_init(struct library_exported_names *names)
{
DICT_INIT(&names->names,
const char*, uint64_t,
dict_hash_string, dict_eq_string, NULL);
DICT_INIT(&names->addrs,
uint64_t, struct vect*,
dict_hash_uint64, dict_eq_uint64, NULL);
}
static void
library_exported_names_destroy(struct library_exported_names *names)
{
DICT_DESTROY(&names->names,
const char*, uint64_t,
dtor_string, NULL, NULL);
DICT_DESTROY(&names->addrs,
uint64_t, struct vect*,
NULL, dtor_vect, NULL);
}
static int
library_exported_names_clone(struct library_exported_names *retp,
const struct library_exported_names *names)
{
return (DICT_CLONE(&retp->names, &names->names,
const char*, uint64_t,
dict_clone_string, dtor_string,
NULL, NULL,
NULL) < 0 ||
DICT_CLONE(&retp->addrs, &names->addrs,
uint64_t, struct vect*,
NULL, NULL,
clone_vect, dtor_vect,
NULL) < 0) ? -1 : 0;
}
int library_exported_names_push(struct library_exported_names *names,
uint64_t addr, char *name,
int own_name )
{
// first, take ownership of the name, if it's not yet ours
if (!own_name)
name = strdup(name);
if (name == NULL)
return -1;
// push to the name->addr map
int result = DICT_INSERT(&names->names, &name, &addr);
if (result > 0) {
// This symbol is already present in the table. This library has
// multiple copies of this symbol (probably corresponding to
// different symbol versions). I should handle this gracefully
// at some point, but for now I simply ignore later instances of
// any particular symbol
free(name);
return 0;
}
if (result != 0)
return result;
// push to the addr->names map
// I get the alias vector. If it doesn't yet exist, I make it
struct vect *aliases;
struct vect **paliases = DICT_FIND_REF(&names->addrs,
&addr, struct vect*);
if (paliases == NULL) {
aliases = malloc(sizeof(struct vect));
if (aliases == NULL)
return -1;
VECT_INIT(aliases, const char*);
result = DICT_INSERT(&names->addrs, &addr, &aliases);
assert(result <= 0);
if (result < 0)
return result;
}
else
aliases = *paliases;
char *namedup = strdup(name);
if (namedup == NULL)
return -1;
result = vect_pushback(aliases, &namedup);
if (result != 0) {
free(namedup);
return result;
}
return 0;
}
struct library_exported_names_each_alias_context
{
enum callback_status (*inner_cb)(const char *, void *);
const char *origname;
void *data;
};
static enum callback_status
library_exported_names_each_alias_cb(const char **name, void *data)
{
struct library_exported_names_each_alias_context *context =
(struct library_exported_names_each_alias_context*)data;
// I do not report the original name we were asked about. Otherwise, any
// time the caller asks for aliases of symbol "sym", I'll always report
// "sym" along with any actual aliases
if (strcmp(*name, context->origname) == 0)
return CBS_CONT;
return context->inner_cb(*name, context->data);
}
const char** library_exported_names_each_alias(
struct library_exported_names *names,
const char *aliasname,
const char **name_start_after,
enum callback_status (*cb)(const char *,
void *),
void *data)
{
// I have a symbol name. I look up its address, then get the list of
// aliased names
uint64_t *addr = DICT_FIND_REF(&names->names,
&aliasname, uint64_t);
if (addr == NULL)
return NULL;
// OK. I have an address. Get the list of symbols at this address
struct vect **aliases = DICT_FIND_REF(&names->addrs,
addr, struct vect*);
assert(aliases != NULL);
struct library_exported_names_each_alias_context context =
{.inner_cb = cb,
.origname = aliasname,
.data = data};
return VECT_EACH(*aliases, const char*, name_start_after,
library_exported_names_each_alias_cb, &context);
}
int library_exported_names_contains(struct library_exported_names *names,
const char *queryname)
{
uint64_t *addr = DICT_FIND_REF(&names->names,
&queryname, uint64_t);
return (addr == NULL) ? 0 : 1;
}
int
library_clone(struct library *retp, struct library *lib)
{
const char *soname = NULL;
const char *pathname;
/* Make lifetimes of strings stored at original independent of
* those at the clone. */
if (strdup_if(&soname, lib->soname, lib->own_soname) < 0
|| strdup_if(&pathname, lib->pathname, lib->own_pathname) < 0) {
if (lib->own_soname)
free((char *)soname);
return -1;
}
private_library_init(retp, lib->type);
library_set_soname(retp, soname, lib->own_soname);
library_set_pathname(retp, pathname, lib->own_pathname);
retp->key = lib->key;
retp->should_activate_latent = lib->should_activate_latent;
/* Clone symbols. */
{
struct library_symbol *it;
struct library_symbol **nsymp = &retp->symbols;
for (it = lib->symbols; it != NULL; it = it->next) {
*nsymp = malloc(sizeof(**nsymp));
if (*nsymp == NULL
|| library_symbol_clone(*nsymp, it) < 0) {
free(*nsymp);
*nsymp = NULL;
fail:
/* Release what we managed to allocate. */
library_destroy(retp);
return -1;
}
(*nsymp)->lib = retp;
nsymp = &(*nsymp)->next;
}
*nsymp = NULL;
}
/* Clone exported names. */
if (library_exported_names_clone(&retp->exported_names,
&lib->exported_names) != 0)
goto fail;
if (os_library_clone(retp, lib) < 0)
goto fail;
if (arch_library_clone(retp, lib) < 0) {
os_library_destroy(retp);
goto fail;
}
#if defined(HAVE_LIBDW)
/* Wipe DWFL_MODULE, leave it to proc_add_library to
* initialize. */
lib->dwfl_module = NULL;
#endif
return 0;
}
void
library_destroy(struct library *lib)
{
if (lib == NULL)
return;
arch_library_destroy(lib);
os_library_destroy(lib);
library_set_soname(lib, NULL, 0);
library_set_pathname(lib, NULL, 0);
struct library_symbol *sym;
for (sym = lib->symbols; sym != NULL; ) {
struct library_symbol *next = sym->next;
library_symbol_destroy(sym);
free(sym);
sym = next;
}
/* Release exported names. */
library_exported_names_destroy(&lib->exported_names);
}
void
library_set_soname(struct library *lib, const char *new_name, int own_name)
{
if (lib->own_soname)
free((char *)lib->soname);
lib->soname = new_name;
lib->own_soname = own_name;
}
void
library_set_pathname(struct library *lib, const char *new_name, int own_name)
{
if (lib->own_pathname)
free((char *)lib->pathname);
lib->pathname = new_name;
lib->own_pathname = own_name;
}
struct library_symbol *
library_each_symbol(struct library *lib, struct library_symbol *start_after,
enum callback_status (*cb)(struct library_symbol *, void *),
void *data)
{
struct library_symbol *it = start_after == NULL ? lib->symbols
: start_after->next;
while (it != NULL) {
struct library_symbol *next = it->next;
switch ((*cb)(it, data)) {
case CBS_FAIL:
/* XXX handle me */
case CBS_STOP:
return it;
case CBS_CONT:
break;
}
it = next;
}
return NULL;
}
void
library_add_symbol(struct library *lib, struct library_symbol *first)
{
struct library_symbol *last;
for (last = first; last != NULL; ) {
last->lib = lib;
if (last->next != NULL)
last = last->next;
else
break;
}
assert(last->next == NULL);
last->next = lib->symbols;
lib->symbols = first;
}
enum callback_status
library_named_cb(struct process *proc, struct library *lib, void *name)
{
if (name == lib->soname
|| strcmp(lib->soname, (char *)name) == 0)
return CBS_STOP;
else
return CBS_CONT;
}
enum callback_status
library_with_key_cb(struct process *proc, struct library *lib, void *keyp)
{
return lib->key == *(arch_addr_t *)keyp ? CBS_STOP : CBS_CONT;
}