/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2013 Roy Marples <roy@marples.name>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <dirent.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "common.h"
#include "dev.h"
#include "eloop.h"
#include "dhcpcd.h"
static struct dev *dev;
static void *handle;
static int fd = -1;
static struct dev_dhcpcd dev_dhcpcd = {
.handle_interface = &handle_interface
};
int
dev_initialized(const char *ifname)
{
if (dev == NULL)
return 1;
return dev->initialized(ifname);
}
int
dev_listening(void)
{
if (dev == NULL)
return 0;
return dev->listening();
}
void
dev_stop(void)
{
if (dev) {
syslog(LOG_DEBUG, "dev: unloaded %s", dev->name);
dev->stop();
free(dev);
dev = NULL;
}
if (handle) {
dlclose(handle);
handle = NULL;
}
}
static int
dev_start2(const char *name)
{
char file[PATH_MAX];
void *h;
void (*fptr)(struct dev *, const struct dev_dhcpcd *);
int r;
snprintf(file, sizeof(file), DEVDIR "/%s", name);
h = dlopen(file, RTLD_LAZY);
if (h == NULL) {
syslog(LOG_ERR, "dlopen: %s", dlerror());
return -1;
}
fptr = (void (*)(struct dev *, const struct dev_dhcpcd *))
dlsym(h, "dev_init");
if (fptr == NULL) {
syslog(LOG_ERR, "dlsym: %s", dlerror());
dlclose(h);
return -1;
}
dev = calloc(1, sizeof(*dev));
fptr(dev, &dev_dhcpcd);
if (dev->start == NULL || (r = dev->start()) == -1) {
free(dev);
dev = NULL;
dlclose(h);
return -1;
}
syslog(LOG_INFO, "dev: loaded %s", dev->name);
handle = h;
return r;
}
static int
dev_start1(const char *plugin)
{
DIR *dp;
struct dirent *d;
int r;
if (dev) {
syslog(LOG_ERR, "dev: already started %s", dev->name);
return -1;
}
if (plugin)
return dev_start2(plugin);
dp = opendir(DEVDIR);
if (dp == NULL) {
syslog(LOG_DEBUG, "dev: %s: %m", DEVDIR);
return 0;
}
r = 0;
while ((d = readdir(dp))) {
if (d->d_name[0] == '.')
continue;
r = dev_start2(d->d_name);
if (r != -1)
break;
}
closedir(dp);
return r;
}
static void
dev_handle_data(__unused void *arg)
{
if (dev->handle_device() == -1) {
/* XXX: an error occured. should we restart dev? */
}
}
int
dev_start(const char *plugin)
{
if (fd != -1) {
syslog(LOG_ERR, "%s: already started on fd %d", __func__, fd);
return fd;
}
fd = dev_start1(plugin);
if (fd != -1) {
if (eloop_event_add(fd, dev_handle_data, NULL) == -1) {
syslog(LOG_ERR, "%s: eloop_event_add: %m", __func__);
dev_stop();
return -1;
}
}
return fd;
}
