Merge branch 'feature/dhcp-server'
This commit is contained in:
Angus Gratton
commit
7c1d7fb43e
5 changed files with 514 additions and 0 deletions
5
examples/access_point/Makefile
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5
examples/access_point/Makefile
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@ -0,0 +1,5 @@
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# Makefile for access_point example
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PROGRAM=access_point
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EXTRA_COMPONENTS=extras/dhcpserver
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include ../../common.mk
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97
examples/access_point/access_point.c
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97
examples/access_point/access_point.c
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@ -0,0 +1,97 @@
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/* Very basic example showing usage of access point mode and the DHCP server.
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The ESP in the example runs a telnet server on 172.16.0.1 (port 23) that
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outputs some status information if you connect to it, then closes
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the connection.
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This example code is in the public domain.
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*/
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#include <string.h>
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#include <espressif/esp_common.h>
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#include <esp/uart.h>
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#include <FreeRTOS.h>
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#include <task.h>
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#include <queue.h>
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#include <dhcpserver.h>
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#include <lwip/api.h>
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#define AP_SSID "esp-open-rtos AP"
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#define AP_PSK "esp-open-rtos"
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#define TELNET_PORT 23
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static void telnetTask(void *pvParameters);
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void user_init(void)
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{
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uart_set_baud(0, 115200);
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printf("SDK version:%s\n", sdk_system_get_sdk_version());
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sdk_wifi_set_opmode(SOFTAP_MODE);
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struct ip_info ap_ip;
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IP4_ADDR(&ap_ip.ip, 172, 16, 0, 1);
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IP4_ADDR(&ap_ip.gw, 0, 0, 0, 0);
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IP4_ADDR(&ap_ip.netmask, 255, 255, 0, 0);
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sdk_wifi_set_ip_info(1, &ap_ip);
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struct sdk_softap_config ap_config = {
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.ssid = AP_SSID,
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.ssid_hidden = 0,
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.channel = 3,
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.ssid_len = strlen(AP_SSID),
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.authmode = AUTH_WPA_WPA2_PSK,
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.password = AP_PSK,
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.max_connection = 3,
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.beacon_interval = 100,
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};
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sdk_wifi_softap_set_config(&ap_config);
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ip_addr_t first_client_ip;
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IP4_ADDR(&first_client_ip, 172, 16, 0, 2);
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dhcpserver_start(&first_client_ip, 4);
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xTaskCreate(telnetTask, (signed char *)"telnetTask", 512, NULL, 2, NULL);
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}
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/* Telnet task listens on port 23, returns some status information and then closes
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the connection if you connect to it.
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*/
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static void telnetTask(void *pvParameters)
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{
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struct netconn *nc = netconn_new (NETCONN_TCP);
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if(!nc) {
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printf("Status monitor: Failed to allocate socket.\r\n");
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return;
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}
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netconn_bind(nc, IP_ADDR_ANY, TELNET_PORT);
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netconn_listen(nc);
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while(1) {
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struct netconn *client = NULL;
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err_t err = netconn_accept(nc, &client);
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if ( err != ERR_OK ) {
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if(client)
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netconn_delete(client);
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continue;
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}
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ip_addr_t client_addr;
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uint16_t port_ignore;
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netconn_peer(client, &client_addr, &port_ignore);
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char buf[80];
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snprintf(buf, sizeof(buf), "Uptime %d seconds\r\n",
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xTaskGetTickCount()*portTICK_RATE_MS/1000);
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netconn_write(client, buf, strlen(buf), NETCONN_COPY);
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snprintf(buf, sizeof(buf), "Free heap %d bytes\r\n", (int)xPortGetFreeHeapSize());
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netconn_write(client, buf, strlen(buf), NETCONN_COPY);
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snprintf(buf, sizeof(buf), "Your address is %d.%d.%d.%d\r\n\r\n",
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ip4_addr1(&client_addr), ip4_addr2(&client_addr),
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ip4_addr3(&client_addr), ip4_addr4(&client_addr));
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netconn_write(client, buf, strlen(buf), NETCONN_COPY);
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netconn_delete(client);
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}
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}
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9
extras/dhcpserver/component.mk
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9
extras/dhcpserver/component.mk
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@ -0,0 +1,9 @@
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# Component makefile for extras/dhcpserver
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INC_DIRS += $(dhcpserver_ROOT)include
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# args for passing into compile rule generation
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dhcpserver_INC_DIR = $(dhcpserver_ROOT)
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dhcpserver_SRC_DIR = $(dhcpserver_ROOT)
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$(eval $(call component_compile_rules,dhcpserver))
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370
extras/dhcpserver/dhcpserver.c
Normal file
370
extras/dhcpserver/dhcpserver.c
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@ -0,0 +1,370 @@
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/* Very basic LWIP & FreeRTOS-based DHCP server
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*
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* Based on RFC2131 http://www.ietf.org/rfc/rfc2131.txt
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* ... although not fully RFC compliant yet.
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*
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* TODO
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* * Allow binding on a single interface only (for mixed AP/client mode), lwip seems to make it hard to
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* listen for or send broadcasts on a specific interface only.
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*
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* * Probably allocates more memory than it should, it should be possible to reuse netbufs in most cases.
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*
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* Part of esp-open-rtos
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* Copyright (C) 2015 Superhouse Automation Pty Ltd
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* BSD Licensed as described in the file LICENSE
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*/
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#include <string.h>
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#include <FreeRTOS.h>
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#include <task.h>
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#include <lwip/netif.h>
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#include <lwip/api.h>
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/* Grow the size of the lwip dhcp_msg struct's options field, as LWIP
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defaults to a 68 octet options field for its DHCP client, and most
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full-sized clients send us more than this. */
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#define DHCP_OPTIONS_LEN 312
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#include <lwip/dhcp.h>
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_Static_assert(sizeof(struct dhcp_msg) == offsetof(struct dhcp_msg, options) + 312, "dhcp_msg_t should have extended options size");
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#include <lwip/netbuf.h>
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#include "dhcpserver.h"
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typedef struct {
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uint8_t hwaddr[NETIF_MAX_HWADDR_LEN];
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uint32_t expires;
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} dhcp_lease_t;
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typedef struct {
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struct netconn *nc;
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uint8_t max_leases;
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ip_addr_t first_client_addr;
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struct netif *server_if;
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dhcp_lease_t *leases; /* length max_leases */
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} server_state_t;
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/* Only one DHCP server task can run at once, so we have global state
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for it.
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*/
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static xTaskHandle dhcpserver_task_handle;
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static server_state_t *state;
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/* Handlers for various kinds of incoming DHCP messages */
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static void handle_dhcp_discover(struct dhcp_msg *received);
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static void handle_dhcp_request(struct dhcp_msg *dhcpmsg);
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static void handle_dhcp_release(struct dhcp_msg *dhcpmsg);
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static void send_dhcp_nak(struct dhcp_msg *dhcpmsg);
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static void dhcpserver_task(void *pxParameter);
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/* Utility functions */
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static uint8_t *find_dhcp_option(struct dhcp_msg *msg, uint8_t option_num, uint8_t min_length, uint8_t *length);
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static uint8_t *add_dhcp_option_byte(uint8_t *opt, uint8_t type, uint8_t value);
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static uint8_t *add_dhcp_option_bytes(uint8_t *opt, uint8_t type, void *value, uint8_t len);
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static dhcp_lease_t *find_lease_slot(uint8_t *hwaddr);
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/* Copy IP address as dotted decimal to 'dest', must be at least 16 bytes long */
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inline static void sprintf_ipaddr(const ip_addr_t *addr, char *dest)
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{
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if(addr == NULL)
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sprintf(dest, "NULL");
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else
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sprintf(dest, "%d.%d.%d.%d", ip4_addr1(addr),
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ip4_addr2(addr), ip4_addr3(addr), ip4_addr4(addr));
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}
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void dhcpserver_start(const ip_addr_t *first_client_addr, uint8_t max_leases)
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{
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/* Stop any existing running dhcpserver */
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if(dhcpserver_task_handle)
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dhcpserver_stop();
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state = malloc(sizeof(server_state_t));
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state->max_leases = max_leases;
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state->leases = calloc(max_leases, sizeof(dhcp_lease_t));
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// state->server_if is assigned once the task is running - see comment in dhcpserver_task()
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ip_addr_copy(state->first_client_addr, *first_client_addr);
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xTaskCreate(dhcpserver_task, (signed char *)"DHCPServer", 768, NULL, 8, &dhcpserver_task_handle);
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}
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void dhcpserver_stop(void)
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{
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if(dhcpserver_task_handle) {
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vTaskDelete(dhcpserver_task_handle);
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free(state);
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dhcpserver_task_handle = NULL;
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}
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}
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static void dhcpserver_task(void *pxParameter)
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{
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/* netif_list isn't assigned until after user_init completes, which is why we do it inside the task */
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state->server_if = netif_list; /* TODO: Make this configurable */
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state->nc = netconn_new (NETCONN_UDP);
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if(!state->nc) {
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printf("OTA TFTP: Failed to allocate socket.\r\n");
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return;
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}
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netconn_bind(state->nc, IP_ADDR_ANY, DHCP_SERVER_PORT);
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while(1)
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{
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struct netbuf *netbuf;
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struct dhcp_msg received = { 0 };
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/* Receive a DHCP packet */
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err_t err = netconn_recv(state->nc, &netbuf);
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if(err != ERR_OK) {
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printf("DHCP Server Error: Failed to receive DHCP packet. err=%d\r\n", err);
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continue;
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}
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/* expire any leases that have passed */
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uint32_t now = xTaskGetTickCount();
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for(int i = 0; i < state->max_leases; i++) {
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uint32_t expires = state->leases[i].expires;
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if(expires && expires < now)
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state->leases[i].expires = 0;
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}
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ip_addr_t received_ip;
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u16_t port;
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netconn_addr(state->nc, &received_ip, &port);
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if(netbuf_len(netbuf) < offsetof(struct dhcp_msg, options)) {
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/* too short to be a valid DHCP client message */
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netbuf_delete(netbuf);
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continue;
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}
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if(netbuf_len(netbuf) >= sizeof(struct dhcp_msg)) {
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printf("DHCP Server Warning: Client sent more options than we know how to parse. len=%d\r\n", netbuf_len(netbuf));
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}
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netbuf_copy(netbuf, &received, sizeof(struct dhcp_msg));
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netbuf_delete(netbuf);
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uint8_t *message_type = find_dhcp_option(&received, DHCP_OPTION_MESSAGE_TYPE,
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DHCP_OPTION_MESSAGE_TYPE_LEN, NULL);
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if(!message_type) {
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printf("DHCP Server Error: No message type field found");
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continue;
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}
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|
||||||
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|
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printf("State dump. Message type %d\n", *message_type);
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for(int i = 0; i < state->max_leases; i++) {
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dhcp_lease_t *lease = &state->leases[i];
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printf("lease slot %d expiry %d hwaddr %02x:%02x:%02x:%02x:%02x:%02x\r\n", i, lease->expires, lease->hwaddr[0],
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lease->hwaddr[1], lease->hwaddr[2], lease->hwaddr[3], lease->hwaddr[4],
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lease->hwaddr[5]);
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|
}
|
||||||
|
|
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switch(*message_type) {
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case DHCP_DISCOVER:
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handle_dhcp_discover(&received);
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break;
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case DHCP_REQUEST:
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|
handle_dhcp_request(&received);
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break;
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case DHCP_RELEASE:
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|
handle_dhcp_release(&received);
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|
default:
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printf("DHCP Server Error: Unsupported message type %d\r\n", *message_type);
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|
break;
|
||||||
|
}
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||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static void handle_dhcp_discover(struct dhcp_msg *dhcpmsg)
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|
{
|
||||||
|
if(dhcpmsg->htype != DHCP_HTYPE_ETH)
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|
return;
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||||||
|
if(dhcpmsg->hlen > NETIF_MAX_HWADDR_LEN)
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||||||
|
return;
|
||||||
|
|
||||||
|
dhcp_lease_t *freelease = find_lease_slot(dhcpmsg->chaddr);
|
||||||
|
if(!freelease) {
|
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|
printf("DHCP Server: All leases taken.\r\n");
|
||||||
|
return; /* Nothing available, so do nothing */
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||||||
|
}
|
||||||
|
|
||||||
|
/* Reuse the DISCOVER buffer for the OFFER response */
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|
dhcpmsg->op = DHCP_BOOTREPLY;
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|
bzero(dhcpmsg->options, DHCP_OPTIONS_LEN);
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|
|
||||||
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ip_addr_copy(dhcpmsg->yiaddr, state->first_client_addr);
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|
ip4_addr4(&(dhcpmsg->yiaddr)) += (freelease - state->leases);
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|
|
||||||
|
uint8_t *opt = (uint8_t *)&dhcpmsg->options;
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|
opt = add_dhcp_option_byte(opt, DHCP_OPTION_MESSAGE_TYPE, DHCP_OFFER);
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|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_SERVER_ID, &state->server_if->ip_addr, 4);
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|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_SUBNET_MASK, &state->server_if->netmask, 4);
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||||||
|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_END, NULL, 0);
|
||||||
|
|
||||||
|
struct netbuf *netbuf = netbuf_new();
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|
netbuf_alloc(netbuf, sizeof(struct dhcp_msg));
|
||||||
|
netbuf_take(netbuf, dhcpmsg, sizeof(struct dhcp_msg));
|
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|
netconn_sendto(state->nc, netbuf, IP_ADDR_BROADCAST, 68);
|
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|
netbuf_delete(netbuf);
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|
}
|
||||||
|
|
||||||
|
static void handle_dhcp_request(struct dhcp_msg *dhcpmsg)
|
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|
{
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||||||
|
static char ipbuf[16];
|
||||||
|
if(dhcpmsg->htype != DHCP_HTYPE_ETH)
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||||||
|
return;
|
||||||
|
if(dhcpmsg->hlen > NETIF_MAX_HWADDR_LEN)
|
||||||
|
return;
|
||||||
|
|
||||||
|
ip_addr_t requested_ip;
|
||||||
|
uint8_t *requested_ip_opt = find_dhcp_option(dhcpmsg, DHCP_OPTION_REQUESTED_IP, 4, NULL);
|
||||||
|
if(requested_ip_opt) {
|
||||||
|
memcpy(&requested_ip.addr, requested_ip_opt, 4);
|
||||||
|
} else if(ip_addr_cmp(&requested_ip, IP_ADDR_ANY)) {
|
||||||
|
ip_addr_copy(requested_ip, dhcpmsg->ciaddr);
|
||||||
|
} else {
|
||||||
|
printf("DHCP Server Error: No requested IP\r\n");
|
||||||
|
send_dhcp_nak(dhcpmsg);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Test the first 4 octets match */
|
||||||
|
if(ip4_addr1(&requested_ip) != ip4_addr1(&state->first_client_addr)
|
||||||
|
|| ip4_addr2(&requested_ip) != ip4_addr2(&state->first_client_addr)
|
||||||
|
|| ip4_addr3(&requested_ip) != ip4_addr3(&state->first_client_addr)) {
|
||||||
|
sprintf_ipaddr(&requested_ip, ipbuf);
|
||||||
|
printf("DHCP Server Error: %s not an allowed IP\r\n", ipbuf);
|
||||||
|
send_dhcp_nak(dhcpmsg);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
/* Test the last octet is in the MAXCLIENTS range */
|
||||||
|
int16_t octet_offs = ip4_addr4(&requested_ip) - ip4_addr4(&state->first_client_addr);
|
||||||
|
if(octet_offs < 0 || octet_offs >= state->max_leases) {
|
||||||
|
printf("DHCP Server Error: Address out of range\r\n");
|
||||||
|
send_dhcp_nak(dhcpmsg);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
dhcp_lease_t *requested_lease = state->leases + octet_offs;
|
||||||
|
if(requested_lease->expires != 0 && memcmp(requested_lease->hwaddr, dhcpmsg->chaddr,dhcpmsg->hlen))
|
||||||
|
{
|
||||||
|
printf("DHCP Server Error: Lease for address already taken\r\n");
|
||||||
|
send_dhcp_nak(dhcpmsg);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
memcpy(requested_lease->hwaddr, dhcpmsg->chaddr, dhcpmsg->hlen);
|
||||||
|
sprintf_ipaddr(&requested_ip, ipbuf);
|
||||||
|
printf("DHCP lease addr %s assigned to MAC %02x:%02x:%02x:%02x:%02x:%02x\r\n", ipbuf, requested_lease->hwaddr[0],
|
||||||
|
requested_lease->hwaddr[1], requested_lease->hwaddr[2], requested_lease->hwaddr[3], requested_lease->hwaddr[4],
|
||||||
|
requested_lease->hwaddr[5]);
|
||||||
|
requested_lease->expires = DHCPSERVER_LEASE_TIME * configTICK_RATE_HZ;
|
||||||
|
|
||||||
|
/* Reuse the REQUEST message as the ACK message */
|
||||||
|
dhcpmsg->op = DHCP_BOOTREPLY;
|
||||||
|
bzero(dhcpmsg->options, DHCP_OPTIONS_LEN);
|
||||||
|
|
||||||
|
ip_addr_copy(dhcpmsg->yiaddr, requested_ip);
|
||||||
|
|
||||||
|
uint8_t *opt = (uint8_t *)&dhcpmsg->options;
|
||||||
|
opt = add_dhcp_option_byte(opt, DHCP_OPTION_MESSAGE_TYPE, DHCP_ACK);
|
||||||
|
uint32_t expiry = htonl(DHCPSERVER_LEASE_TIME);
|
||||||
|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_LEASE_TIME, &expiry, 4);
|
||||||
|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_SERVER_ID, &state->server_if->ip_addr, 4);
|
||||||
|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_SUBNET_MASK, &state->server_if->netmask, 4);
|
||||||
|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_END, NULL, 0);
|
||||||
|
|
||||||
|
struct netbuf *netbuf = netbuf_new();
|
||||||
|
netbuf_alloc(netbuf, sizeof(struct dhcp_msg));
|
||||||
|
netbuf_take(netbuf, dhcpmsg, sizeof(struct dhcp_msg));
|
||||||
|
netconn_sendto(state->nc, netbuf, IP_ADDR_BROADCAST, 68);
|
||||||
|
netbuf_delete(netbuf);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void handle_dhcp_release(struct dhcp_msg *dhcpmsg)
|
||||||
|
{
|
||||||
|
dhcp_lease_t *lease = find_lease_slot(dhcpmsg->chaddr);
|
||||||
|
if(lease) {
|
||||||
|
lease->expires = 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static void send_dhcp_nak(struct dhcp_msg *dhcpmsg)
|
||||||
|
{
|
||||||
|
/* Reuse 'dhcpmsg' for the NAK */
|
||||||
|
dhcpmsg->op = DHCP_BOOTREPLY;
|
||||||
|
bzero(dhcpmsg->options, DHCP_OPTIONS_LEN);
|
||||||
|
|
||||||
|
uint8_t *opt = (uint8_t *)&dhcpmsg->options;
|
||||||
|
opt = add_dhcp_option_byte(opt, DHCP_OPTION_MESSAGE_TYPE, DHCP_NAK);
|
||||||
|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_SERVER_ID, &state->server_if->ip_addr, 4);
|
||||||
|
opt = add_dhcp_option_bytes(opt, DHCP_OPTION_END, NULL, 0);
|
||||||
|
|
||||||
|
struct netbuf *netbuf = netbuf_new();
|
||||||
|
netbuf_alloc(netbuf, sizeof(struct dhcp_msg));
|
||||||
|
netbuf_take(netbuf, dhcpmsg, sizeof(struct dhcp_msg));
|
||||||
|
netconn_sendto(state->nc, netbuf, IP_ADDR_BROADCAST, 68);
|
||||||
|
netbuf_delete(netbuf);
|
||||||
|
}
|
||||||
|
|
||||||
|
static uint8_t *find_dhcp_option(struct dhcp_msg *msg, uint8_t option_num, uint8_t min_length, uint8_t *length)
|
||||||
|
{
|
||||||
|
uint8_t *start = (uint8_t *)&msg->options;
|
||||||
|
uint8_t *msg_end = (uint8_t *)msg + sizeof(struct dhcp_msg);
|
||||||
|
|
||||||
|
for(uint8_t *p = start; p < msg_end-2;) {
|
||||||
|
uint8_t type = *p++;
|
||||||
|
uint8_t len = *p++;
|
||||||
|
if(type == DHCP_OPTION_END)
|
||||||
|
return NULL;
|
||||||
|
if(p+len >= msg_end)
|
||||||
|
break; /* We've overrun our valid DHCP message size, or this isn't a valid option */
|
||||||
|
if(type == option_num) {
|
||||||
|
if(len < min_length)
|
||||||
|
break;
|
||||||
|
if(length)
|
||||||
|
*length = len;
|
||||||
|
return p; /* start of actual option data */
|
||||||
|
}
|
||||||
|
p += len;
|
||||||
|
}
|
||||||
|
return NULL; /* Not found */
|
||||||
|
}
|
||||||
|
|
||||||
|
static uint8_t *add_dhcp_option_byte(uint8_t *opt, uint8_t type, uint8_t value)
|
||||||
|
{
|
||||||
|
*opt++ = type;
|
||||||
|
*opt++ = 1;
|
||||||
|
*opt++ = value;
|
||||||
|
return opt;
|
||||||
|
}
|
||||||
|
|
||||||
|
static uint8_t *add_dhcp_option_bytes(uint8_t *opt, uint8_t type, void *value, uint8_t len)
|
||||||
|
{
|
||||||
|
*opt++ = type;
|
||||||
|
if(len) {
|
||||||
|
*opt++ = len;
|
||||||
|
memcpy(opt, value, len);
|
||||||
|
}
|
||||||
|
return opt+len;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Find a free DHCP lease, or a lease already assigned to 'hwaddr' */
|
||||||
|
static dhcp_lease_t *find_lease_slot(uint8_t *hwaddr)
|
||||||
|
{
|
||||||
|
dhcp_lease_t *empty_lease = NULL;
|
||||||
|
for(int i = 0; i < state->max_leases; i++) {
|
||||||
|
if(state->leases[i].expires == 0 && !empty_lease)
|
||||||
|
empty_lease = &state->leases[i];
|
||||||
|
else if (memcmp(hwaddr, state->leases[i].hwaddr, 6) == 0)
|
||||||
|
return &state->leases[i];
|
||||||
|
}
|
||||||
|
return empty_lease;
|
||||||
|
}
|
||||||
33
extras/dhcpserver/include/dhcpserver.h
Normal file
33
extras/dhcpserver/include/dhcpserver.h
Normal file
|
|
@ -0,0 +1,33 @@
|
||||||
|
/* Very basic LWIP & FreeRTOS-based DHCP server
|
||||||
|
*
|
||||||
|
* Header file contains default configuration for the DHCP server.
|
||||||
|
*
|
||||||
|
*
|
||||||
|
* Part of esp-open-rtos
|
||||||
|
* Copyright (C) 2015 Superhouse Automation Pty Ltd
|
||||||
|
* BSD Licensed as described in the file LICENSE
|
||||||
|
*/
|
||||||
|
#ifndef _DHCPSERVER_H
|
||||||
|
#define _DHCPSERVER_H
|
||||||
|
|
||||||
|
#ifndef DHCPSERVER_LEASE_TIME
|
||||||
|
#define DHCPSERVER_LEASE_TIME 3600
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Start DHCP server.
|
||||||
|
|
||||||
|
Static IP of server should already be set and network interface enabled.
|
||||||
|
|
||||||
|
first_client_addr is the IP address of the first lease to be handed
|
||||||
|
to a client. Subsequent lease addresses are calculated by
|
||||||
|
incrementing the final octet of the IPv4 address, up to max_leases.
|
||||||
|
*/
|
||||||
|
void dhcpserver_start(const ip_addr_t *first_client_addr, uint8_t max_leases);
|
||||||
|
|
||||||
|
void dhcpserver_get_lease(const ip_addr_t *first_client_addr, uint8_t max_leases);
|
||||||
|
|
||||||
|
/* Stop DHCP server.
|
||||||
|
*/
|
||||||
|
void dhcpserver_stop(void);
|
||||||
|
|
||||||
|
#endif
|
||||||
Loading…
Reference in a new issue