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/*
* Copyright (C) 2016, 2017 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <dlfcn.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include "afb-api-so.h"
#include "afb-api-so-v1.h"
#include "afb-api-so-v2.h"
#include "verbose.h"
#include "sig-monitor.h"
struct safe_dlopen
{
const char *path;
void *handle;
int flags;
};
static void safe_dlopen_cb(int sig, void *closure)
{
struct safe_dlopen *sd = closure;
if (!sig)
sd->handle = dlopen(sd->path, sd->flags);
else {
ERROR("dlopen of %s raised signal %s", sd->path, strsignal(sig));
sd->handle = NULL;
}
}
static void *safe_dlopen(const char *filename, int flags)
{
struct safe_dlopen sd;
sd.path = filename;
sd.flags = flags;
sd.handle = NULL;
sig_monitor(0, safe_dlopen_cb, &sd);
return sd.handle;
}
static int load_binding(const char *path, int force, struct afb_apiset *apiset)
{
int rc;
void *handle;
// This is a loadable library let's check if it's a binding
rc = -!!force;
handle = safe_dlopen(path, RTLD_NOW | RTLD_LOCAL);
if (handle == NULL) {
if (force)
ERROR("binding [%s] not loadable: %s", path, dlerror());
else
INFO("binding [%s] not loadable: %s", path, dlerror());
goto error;
}
/* try the version 2 */
rc = afb_api_so_v2_add(path, handle, apiset);
if (rc < 0) {
/* error when loading a valid v2 binding */
goto error2;
}
if (rc)
return 0; /* yes version 2 */
/* try the version 1 */
rc = afb_api_so_v1_add(path, handle, apiset);
if (rc < 0) {
/* error when loading a valid v1 binding */
goto error2;
}
if (rc)
return 0; /* yes version 1 */
/* not a valid binding */
if (force)
ERROR("binding [%s] is not an AFB binding", path);
else
INFO("binding [%s] is not an AFB binding", path);
error2:
dlclose(handle);
error:
return rc;
}
int afb_api_so_add_binding(const char *path, struct afb_apiset *apiset)
{
return load_binding(path, 1, apiset);
}
static int adddirs(char path[PATH_MAX], size_t end, struct afb_apiset *apiset)
{
DIR *dir;
struct dirent *dent;
size_t len;
/* open the DIR now */
dir = opendir(path);
if (dir == NULL) {
ERROR("can't scan binding directory %s, %m", path);
return -1;
}
INFO("Scanning dir=[%s] for bindings", path);
/* scan each entry */
if (end)
path[end++] = '/';
for (;;) {
errno = 0;
dent = readdir(dir);
if (dent == NULL) {
if (errno != 0)
ERROR("read error while scanning directory %.*s: %m", (int)(end - 1), path);
break;
}
len = strlen(dent->d_name);
if (len + end >= PATH_MAX) {
ERROR("path too long while scanning bindings for %s", dent->d_name);
continue;
}
if (dent->d_type == DT_DIR) {
/* case of directories */
if (dent->d_name[0] == '.') {
if (len == 1)
continue; /* . */
if (dent->d_name[1] == '.' && len == 2)
continue; /* .. */
}
memcpy(&path[end], dent->d_name, len+1);
adddirs(path, end+len, apiset);
} else if (dent->d_type == DT_REG) {
/* case of files */
if (memcmp(&dent->d_name[len - 3], ".so", 4))
continue;
memcpy(&path[end], dent->d_name, len+1);
if (load_binding(path, 0, apiset) < 0)
return -1;
}
}
closedir(dir);
return 0;
}
int afb_api_so_add_directory(const char *path, struct afb_apiset *apiset)
{
size_t length;
char buffer[PATH_MAX];
length = strlen(path);
if (length >= sizeof(buffer)) {
ERROR("path too long %lu [%.99s...]", (unsigned long)length, path);
return -1;
}
memcpy(buffer, path, length + 1);
return adddirs(buffer, length, apiset);
}
int afb_api_so_add_path(const char *path, struct afb_apiset *apiset)
{
struct stat st;
int rc;
rc = stat(path, &st);
if (rc < 0)
ERROR("Invalid binding path [%s]: %m", path);
else if (S_ISDIR(st.st_mode))
rc = afb_api_so_add_directory(path, apiset);
else if (strstr(path, ".so"))
rc = load_binding(path, 0, apiset);
else
INFO("not a binding [%s], skipped", path);
return rc;
}
int afb_api_so_add_pathset(const char *pathset, struct afb_apiset *apiset)
{
static char sep[] = ":";
char *ps, *p;
ps = strdupa(pathset);
for (;;) {
p = strsep(&ps, sep);
if (!p)
return 0;
if (afb_api_so_add_path(p, apiset) < 0)
return -1;
}
}
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