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/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2012 Roy Marples <roy@marples.name>
* All rights reserved
* 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 <sys/stat.h>
#include <sys/un.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "config.h"
#include "common.h"
#include "dhcpcd.h"
#include "control.h"
#include "eloop.h"
static int fd = -1;
static char buffer[1024];
static char *argvp[255];
static struct sockaddr_un sun;
struct fd_list *control_fds = NULL;
#ifdef DEBUG_MEMORY
static void
cleanup(void)
{
struct fd_list *f;
f = control_fds;
while (f) {
control_fds = f->next;
free(f);
f = control_fds;
}
}
#endif
static void
control_remove(void *arg)
{
struct fd_list *l, *n, *last = NULL;
l = control_fds;
while (l) {
n = l->next;
if (l == arg) {
close(l->fd);
eloop_event_delete(l->fd);
if (last == NULL)
control_fds = l->next;
else
last->next = l->next;
free(l);
break;
}
last = l;
l = n;
}
}
static void
control_handle_data(void *arg)
{
struct fd_list *l = arg;
ssize_t bytes;
int argc;
char *e, *p;
char **ap;
bytes = read(l->fd, buffer, sizeof(buffer) - 1);
if (bytes == -1 || bytes == 0) {
control_remove(l);
return;
}
buffer[bytes] = '\0';
p = buffer;
e = buffer + bytes;
argc = 0;
ap = argvp;
while (p < e && (size_t)argc < sizeof(argvp)) {
argc++;
*ap++ = p;
p += strlen(p) + 1;
}
handle_args(l, argc, argvp);
}
/* ARGSUSED */
static void
control_handle(__unused void *arg)
{
struct sockaddr_un run;
socklen_t len;
struct fd_list *l;
int f;
len = sizeof(run);
if ((f = accept(fd, (struct sockaddr *)&run, &len)) == -1)
return;
set_cloexec(f);
l = malloc(sizeof(*l));
if (l) {
l->fd = f;
l->listener = 0;
l->next = control_fds;
control_fds = l;
eloop_event_add(l->fd, control_handle_data, l);
}
}
static int
make_sock(void)
{
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
return -1;
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, CONTROLSOCKET, sizeof(sun.sun_path));
return sizeof(sun.sun_family) + strlen(sun.sun_path) + 1;
}
int
control_start(void)
{
int len;
if ((len = make_sock()) == -1)
return -1;
unlink(CONTROLSOCKET);
if (bind(fd, (struct sockaddr *)&sun, len) == -1 ||
chmod(CONTROLSOCKET,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP) == -1 ||
set_cloexec(fd) == -1 ||
set_nonblock(fd) == -1 ||
listen(fd, sizeof(control_fds)) == -1)
{
close(fd);
return -1;
}
eloop_event_add(fd, control_handle, NULL);
return fd;
}
int
control_stop(void)
{
int retval = 0;
struct fd_list *l;
eloop_event_delete(fd);
if (shutdown(fd, SHUT_RDWR) == -1)
retval = 1;
fd = -1;
if (unlink(CONTROLSOCKET) == -1)
retval = -1;
l = control_fds;
while (l != NULL) {
control_fds = l->next;
eloop_event_delete(l->fd);
shutdown(l->fd, SHUT_RDWR);
free(l);
l = control_fds;
}
return retval;
}
int
control_open(void)
{
int len;
if ((len = make_sock()) == -1)
return -1;
#ifdef DEBUG_MEMORY
atexit(cleanup);
#endif
return connect(fd, (struct sockaddr *)&sun, len);
}
int
control_send(int argc, char * const *argv)
{
char *p = buffer;
int i;
size_t len;
if (argc > 255) {
errno = ENOBUFS;
return -1;
}
for (i = 0; i < argc; i++) {
len = strlen(argv[i]) + 1;
if ((p - buffer) + len > sizeof(buffer)) {
errno = ENOBUFS;
return -1;
}
memcpy(p, argv[i], len);
p += len;
}
return write(fd, buffer, p - buffer);
}
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