dhcp: Add DHCP client initialization
Provide functionality for initializing a DHCP client struct, setting interface index, last used address and additional options to request. On initialization the most useful options are added by default.
This commit is contained in:
parent
5f404b1e68
commit
011feef852
125
src/libsystemd-dhcp/dhcp-client.c
Normal file
125
src/libsystemd-dhcp/dhcp-client.c
Normal file
|
@ -0,0 +1,125 @@
|
|||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright (C) 2013 Intel Corporation. All rights reserved.
|
||||
|
||||
systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
systemd 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
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
***/
|
||||
|
||||
#include <stdlib.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
|
||||
#include "util.h"
|
||||
#include "list.h"
|
||||
|
||||
#include "dhcp-protocol.h"
|
||||
#include "sd-dhcp-client.h"
|
||||
|
||||
struct sd_dhcp_client {
|
||||
DHCPState state;
|
||||
int index;
|
||||
uint8_t *req_opts;
|
||||
size_t req_opts_size;
|
||||
uint32_t last_addr;
|
||||
};
|
||||
|
||||
static const uint8_t default_req_opts[] = {
|
||||
DHCP_OPTION_SUBNET_MASK,
|
||||
DHCP_OPTION_ROUTER,
|
||||
DHCP_OPTION_HOST_NAME,
|
||||
DHCP_OPTION_DOMAIN_NAME,
|
||||
DHCP_OPTION_DOMAIN_NAME_SERVER,
|
||||
DHCP_OPTION_NTP_SERVER,
|
||||
};
|
||||
|
||||
int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option)
|
||||
{
|
||||
size_t i;
|
||||
|
||||
assert_return(client, -EINVAL);
|
||||
assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
|
||||
|
||||
switch(option) {
|
||||
case DHCP_OPTION_PAD:
|
||||
case DHCP_OPTION_OVERLOAD:
|
||||
case DHCP_OPTION_MESSAGE_TYPE:
|
||||
case DHCP_OPTION_PARAMETER_REQUEST_LIST:
|
||||
case DHCP_OPTION_END:
|
||||
return -EINVAL;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
for (i = 0; i < client->req_opts_size; i++)
|
||||
if (client->req_opts[i] == option)
|
||||
return -EEXIST;
|
||||
|
||||
if (!GREEDY_REALLOC(client->req_opts, client->req_opts_size,
|
||||
client->req_opts_size + 1))
|
||||
return -ENOMEM;
|
||||
|
||||
client->req_opts[client->req_opts_size - 1] = option;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
|
||||
const struct in_addr *last_addr)
|
||||
{
|
||||
assert_return(client, -EINVAL);
|
||||
assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
|
||||
|
||||
if (last_addr)
|
||||
client->last_addr = last_addr->s_addr;
|
||||
else
|
||||
client->last_addr = INADDR_ANY;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index)
|
||||
{
|
||||
assert_return(client, -EINVAL);
|
||||
assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
|
||||
assert_return(interface_index >= -1, -EINVAL);
|
||||
|
||||
client->index = interface_index;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
sd_dhcp_client *sd_dhcp_client_new(void)
|
||||
{
|
||||
sd_dhcp_client *client;
|
||||
|
||||
client = new0(sd_dhcp_client, 1);
|
||||
if (!client)
|
||||
return NULL;
|
||||
|
||||
client->state = DHCP_STATE_INIT;
|
||||
client->index = -1;
|
||||
|
||||
client->req_opts_size = ELEMENTSOF(default_req_opts);
|
||||
|
||||
client->req_opts = memdup(default_req_opts, client->req_opts_size);
|
||||
if (!client->req_opts) {
|
||||
free(client);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return client;
|
||||
}
|
36
src/systemd/sd-dhcp-client.h
Normal file
36
src/systemd/sd-dhcp-client.h
Normal file
|
@ -0,0 +1,36 @@
|
|||
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||||
|
||||
#ifndef foosddhcpclienthfoo
|
||||
#define foosddhcpclienthfoo
|
||||
|
||||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright (C) 2013 Intel Corporation. All rights reserved.
|
||||
|
||||
systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
systemd 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
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
***/
|
||||
|
||||
#include <netinet/in.h>
|
||||
|
||||
typedef struct sd_dhcp_client sd_dhcp_client;
|
||||
|
||||
int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option);
|
||||
int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
|
||||
const struct in_addr *last_address);
|
||||
int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index);
|
||||
|
||||
sd_dhcp_client *sd_dhcp_client_new(void);
|
||||
|
||||
#endif
|
Loading…
Reference in a new issue