Daiki Kato
Dhcp server sample.
Dependents: GR-PEACH_WebCamera_AP
mbedボードをDHCPサーバとして使用するためのライブラリです。mbedボードとPCを直結する際などに使用してください。
このクラスは5つのIPアドレスを割り当てられることができます。
IPアドレスの上位3バイトはサーバーアドレスと同じで、下の1バイトは、10-14が割り当てられます。
例えば、サーバーアドレスが"192.168.0.1"の場合、IPアドレスは"192.168.0.10"～"192.168.0.14"が割り当てられます。
EthernetInterfaceでconnectを実行した後に、DhcpServerを使用してください。
EthernetInterface eth;
eth.init("192.168.0.1", "255.255.255.0", "192.168.0.1");
eth.connect();
DhcpServer dhcp_server("HostName", eth.getIPAddress());
Library in Beta!
This library is in Beta.
このライブラリはβ版です。
DhcpServer.cpp
- Committer:
- dkato
- Date:
- 2016-04-06
- Revision:
- 1:14ee6da645a9
- Parent:
- 0:1c2747611cab
File content as of revision 1:14ee6da645a9:
#include "mbed.h"
#include "rtos.h"
#include "lwip/netif.h"
#include "TCPSocketConnection.h"
#include "TCPSocketServer.h"
#include "Endpoint.h"
#include "UDPSocket.h"
#include "dhcp.h"
#include "DhcpServer.h"
#define CONNECT_NUM (5)
#define IP_ADDER_START (10)
#define OFS_XID (4)
#define OFS_YIADDR (16)
#define OFS_SIADDR (20)
#define OFS_CHADDR (28)
#define OFS_SNAME (44)
#define OFS_COOKIE (236)
#define OFS_OPTIONS (240)
static char receivebuff[500];
static char sendbuff[300] = {0};
static UDPSocket dhcp_server;
static Thread * dhcpThread = NULL;
static char chaddr_tbl[CONNECT_NUM][6] = {0};
static const char mac_no_use[6] = {0, 0, 0, 0, 0, 0};
static void dhcp_task_static(void const *argument) {
Endpoint client;
int cnt;
int tbl_index;
dhcp_server.bind(67);
dhcp_server.set_broadcasting(true);
while (true) {
int n = dhcp_server.receiveFrom(client, receivebuff, sizeof(receivebuff));
if (n > 0) {
client.set_address("255.255.255.255", 68);
sendbuff[OFS_XID + 0] = receivebuff[OFS_XID + 0];
sendbuff[OFS_XID + 1] = receivebuff[OFS_XID + 1];
sendbuff[OFS_XID + 2] = receivebuff[OFS_XID + 2];
sendbuff[OFS_XID + 3] = receivebuff[OFS_XID + 3];
tbl_index = -1;
for (cnt = 0; cnt < CONNECT_NUM; cnt++) {
if (memcmp(&receivebuff[OFS_CHADDR], chaddr_tbl[cnt], 6) == 0) {
tbl_index = cnt;
break;
}
}
if (tbl_index == -1) {
sendbuff[OFS_YIADDR + 0] = 0;
sendbuff[OFS_YIADDR + 1] = 0;
sendbuff[OFS_YIADDR + 2] = 0;
sendbuff[OFS_YIADDR + 3] = 0;
} else {
sendbuff[OFS_YIADDR + 0] = sendbuff[OFS_SIADDR + 0];
sendbuff[OFS_YIADDR + 1] = sendbuff[OFS_SIADDR + 1];
sendbuff[OFS_YIADDR + 2] = sendbuff[OFS_SIADDR + 2];
sendbuff[OFS_YIADDR + 3] = IP_ADDER_START + tbl_index;
}
sendbuff[OFS_CHADDR + 0] = receivebuff[OFS_CHADDR + 0];
sendbuff[OFS_CHADDR + 1] = receivebuff[OFS_CHADDR + 1];
sendbuff[OFS_CHADDR + 2] = receivebuff[OFS_CHADDR + 2];
sendbuff[OFS_CHADDR + 3] = receivebuff[OFS_CHADDR + 3];
sendbuff[OFS_CHADDR + 4] = receivebuff[OFS_CHADDR + 4];
sendbuff[OFS_CHADDR + 5] = receivebuff[OFS_CHADDR + 5];
if (receivebuff[OFS_OPTIONS + 2] == DHCP_DISCOVER) {
sendbuff[OFS_OPTIONS + 2] = DHCP_OFFER;
if (tbl_index == -1) {
for (cnt = 0; cnt < CONNECT_NUM; cnt++) {
if (memcmp( chaddr_tbl[cnt], mac_no_use, 6) == 0) {
tbl_index = cnt;
break;
}
}
}
if (tbl_index != -1) {
chaddr_tbl[tbl_index][0] = receivebuff[OFS_CHADDR + 0];
chaddr_tbl[tbl_index][1] = receivebuff[OFS_CHADDR + 1];
chaddr_tbl[tbl_index][2] = receivebuff[OFS_CHADDR + 2];
chaddr_tbl[tbl_index][3] = receivebuff[OFS_CHADDR + 3];
chaddr_tbl[tbl_index][4] = receivebuff[OFS_CHADDR + 4];
chaddr_tbl[tbl_index][5] = receivebuff[OFS_CHADDR + 5];
sendbuff[OFS_YIADDR + 0] = sendbuff[OFS_SIADDR + 0];
sendbuff[OFS_YIADDR + 1] = sendbuff[OFS_SIADDR + 1];
sendbuff[OFS_YIADDR + 2] = sendbuff[OFS_SIADDR + 2];
sendbuff[OFS_YIADDR + 3] = IP_ADDER_START + tbl_index;
}
dhcp_server.sendTo(client, sendbuff, 300);
} else if (receivebuff[OFS_OPTIONS + 2] == DHCP_REQUEST) {
if (tbl_index != -1) {
sendbuff[OFS_OPTIONS + 2] = DHCP_ACK;
} else {
sendbuff[OFS_OPTIONS + 2] = DHCP_NAK;
}
dhcp_server.sendTo(client, sendbuff, 300);
} else if (receivebuff[OFS_OPTIONS + 2] == DHCP_RELEASE) {
if (tbl_index != -1) {
memset(chaddr_tbl[tbl_index], 0, 6);
}
} else {
// do nothing
}
}
}
}
DhcpServer::DhcpServer(char * name, char * ipadder) {
int i;
int len;
int ofs;
sscanf(ipadder, "%d.%d.%d.%d", (int *)&sendbuff[OFS_SIADDR + 0], (int *)&sendbuff[OFS_SIADDR + 1],
(int *)&sendbuff[OFS_SIADDR + 2], (int *)&sendbuff[OFS_SIADDR + 3]);
len = strlen(name);
for (i = 0; (i < len) && (i < DHCP_SNAME_LEN); i++) {
sendbuff[OFS_SNAME + i] = name[i];
}
sendbuff[0] = 0x02;
sendbuff[1] = 0x01;
sendbuff[2] = 0x06;
sendbuff[3] = 0x00;
sendbuff[OFS_COOKIE + 0] = 0x63;
sendbuff[OFS_COOKIE + 1] = 0x82;
sendbuff[OFS_COOKIE + 2] = 0x53;
sendbuff[OFS_COOKIE + 3] = 0x63;
ofs = OFS_OPTIONS;
sendbuff[ofs++] = DHCP_OPTION_MESSAGE_TYPE;
sendbuff[ofs++] = DHCP_OPTION_MESSAGE_TYPE_LEN;
sendbuff[ofs++] = 0;
sendbuff[ofs++] = DHCP_OPTION_SERVER_ID;
sendbuff[ofs++] = 0x04;
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 0];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 1];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 2];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 3];
sendbuff[ofs++] = DHCP_OPTION_LEASE_TIME;
sendbuff[ofs++] = 0x04;
sendbuff[ofs++] = 0x00;
sendbuff[ofs++] = 0x01;
sendbuff[ofs++] = 0x4e;
sendbuff[ofs++] = 0x20;
sendbuff[ofs++] = DHCP_OPTION_SUBNET_MASK;
sendbuff[ofs++] = 0x04;
sendbuff[ofs++] = 0xff;
sendbuff[ofs++] = 0xff;
sendbuff[ofs++] = 0xff;
sendbuff[ofs++] = 0xf0;
sendbuff[ofs++] = DHCP_OPTION_ROUTER;
sendbuff[ofs++] = 0x04;
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 0];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 1];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 2];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 3];
sendbuff[ofs++] = DHCP_OPTION_DNS_SERVER;
sendbuff[ofs++] = 0x04;
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 0];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 1];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 2];
sendbuff[ofs++] = sendbuff[OFS_SIADDR + 3];
sendbuff[ofs++] = 0xff;
if (dhcpThread == NULL) {
dhcpThread = new Thread(&dhcp_task_static, NULL, osPriorityNormal, (1024 * 8));
}
}
DhcpServer::~DhcpServer() {
if (dhcpThread != NULL) {
delete dhcpThread;
}
}