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/*
* Copyright (C) 2012 ProFUSION embedded systems
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <dlfcn.h>
#include <limits.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/* kmod_elf_get_section() is not exported, we need the private header */
#include <libkmod-private.h>
/* FIXME: hack, change name so we don't clash */
#undef ERR
#include "testsuite.h"
#include "stripped-module.h"
struct mod {
struct mod *next;
int ret;
int errcode;
char name[];
};
static struct mod *modules;
static bool need_init = true;
static void parse_retcodes(struct mod *_modules, const char *s)
{
const char *p;
if (s == NULL)
return;
for (p = s;;) {
struct mod *mod;
const char *modname;
char *end;
size_t modnamelen;
int ret, errcode;
long l;
modname = p;
if (modname == NULL || modname[0] == '\0')
break;
modnamelen = strcspn(s, ":");
if (modname[modnamelen] != ':')
break;
p = modname + modnamelen + 1;
if (p == NULL)
break;
l = strtol(p, &end, 0);
if (end == p || *end != ':')
break;
ret = (int) l;
p = end + 1;
l = strtol(p, &end, 0);
if (*end == ':')
p = end + 1;
else if (*end != '\0')
break;
errcode = (int) l;
mod = malloc(sizeof(*mod) + modnamelen + 1);
if (mod == NULL)
break;
memcpy(mod->name, modname, modnamelen);
mod->name[modnamelen] = '\0';
mod->ret = ret;
mod->errcode = errcode;
mod->next = _modules;
_modules = mod;
}
}
static struct mod *find_module(struct mod *_modules, const char *modname)
{
struct mod *mod;
for (mod = _modules; mod != NULL; mod = mod->next) {
if (strcmp(mod->name, modname))
return mod;
}
return NULL;
}
static void init_retcodes(void)
{
const char *s;
if (!need_init)
return;
need_init = false;
s = getenv(S_TC_INIT_MODULE_RETCODES);
if (s == NULL) {
fprintf(stderr, "TRAP init_module(): missing export %s?\n",
S_TC_INIT_MODULE_RETCODES);
}
parse_retcodes(modules, s);
}
TS_EXPORT long init_module(void *mem, unsigned long len, const char *args);
/*
* FIXME: change /sys/module/<modname> to fake-insert a module
*
* Default behavior is to exit successfully. If this is not the intended
* behavior, set TESTSUITE_INIT_MODULE_RETCODES env var.
*/
long init_module(void *mem, unsigned long len, const char *args)
{
const char *modname;
struct kmod_elf *elf;
struct mod *mod;
const void *buf;
uint64_t bufsize;
int err;
init_retcodes();
elf = kmod_elf_new(mem, len);
if (elf == NULL)
return 0;
err = kmod_elf_get_section(elf, ".gnu.linkonce.this_module", &buf,
&bufsize);
kmod_elf_unref(elf);
/*
* We couldn't find the module's name inside the ELF file. Just exit
* as if it was successful
*/
if (err < 0)
return 0;
modname = (char *)buf + offsetof(struct module, name);
mod = find_module(modules, modname);
if (mod == NULL)
return 0;
errno = mod->errcode;
return mod->ret;
}
/* the test is going away anyway, but lets keep valgrind happy */
void free_resources(void) __attribute__((destructor));
void free_resources(void)
{
while (modules) {
struct mod *mod = modules->next;
free(modules);
modules = mod;
}
}
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