// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. //#include "esp_common.h" #include #include #include "lwip/inet.h" #include "lwip/err.h" #include "lwip/pbuf.h" #include "lwip/udp.h" #include "lwip/mem.h" #include "lwip/ip_addr.h" #include "esp_netif.h" #include "dhcpserver/dhcpserver.h" #include "dhcpserver/dhcpserver_options.h" #if ESP_DHCP #define BOOTP_BROADCAST 0x8000 #define DHCP_REQUEST 1 #define DHCP_REPLY 2 #define DHCP_HTYPE_ETHERNET 1 #define DHCP_HLEN_ETHERNET 6 #define DHCP_MSG_LEN 236 #define DHCPS_SERVER_PORT 67 #define DHCPS_CLIENT_PORT 68 #define DHCPDISCOVER 1 #define DHCPOFFER 2 #define DHCPREQUEST 3 #define DHCPDECLINE 4 #define DHCPACK 5 #define DHCPNAK 6 #define DHCPRELEASE 7 #define DHCP_OPTION_SUBNET_MASK 1 #define DHCP_OPTION_ROUTER 3 #define DHCP_OPTION_DNS_SERVER 6 #define DHCP_OPTION_REQ_IPADDR 50 #define DHCP_OPTION_LEASE_TIME 51 #define DHCP_OPTION_MSG_TYPE 53 #define DHCP_OPTION_SERVER_ID 54 #define DHCP_OPTION_INTERFACE_MTU 26 #define DHCP_OPTION_PERFORM_ROUTER_DISCOVERY 31 #define DHCP_OPTION_BROADCAST_ADDRESS 28 #define DHCP_OPTION_REQ_LIST 55 #define DHCP_OPTION_END 255 //#define USE_CLASS_B_NET 1 #define DHCPS_DEBUG 0 #define DHCPS_LOG printf #define IS_INVALID_SUBNET_MASK(x) (((x-1) | x) != 0xFFFFFFFF) /* Notes: * 1. Class a address range 0.0.0.0~127.255.255.255. * 2. Class b address range 128.0.0.0~191.255.255.255. * 3. Class c address range 192.0.0.0~223.255.255.255. */ #define IS_VALID_CLASSA_SUBNET_MASK(mask) (mask >= 0xFF000000 && mask <= 0xFFFE0000) #define IS_VALID_CLASSB_SUBNET_MASK(mask) (mask >= 0xFFFF0000 && mask <= 0xFFFFFE00) #define IS_VALID_CLASSC_SUBNET_MASK(mask) (mask >= 0xFFFFFF00 && mask <= 0xFFFFFFFC) #define IP_CLASS_HOST_NUM(mask) (0xffffffff & ~mask) #define DHCP_CHECK_SUBNET_MASK_IP(mask, ip) \ do { \ if (IS_INVALID_SUBNET_MASK(mask)) { \ DHCPS_LOG("dhcps: Illegal subnet mask.\n"); \ return ERR_ARG; \ } else { \ if (IP_CLASSA(ip)) { \ if(!IS_VALID_CLASSA_SUBNET_MASK(mask)) { \ DHCPS_LOG("dhcps: The subnet mask does not match the A address.\n"); \ return ERR_ARG; \ } \ } else if (IP_CLASSB(ip)) { \ if(!IS_VALID_CLASSB_SUBNET_MASK(mask)) { \ DHCPS_LOG("dhcps: The subnet mask does not match the B address.\n"); \ return ERR_ARG; \ } \ } else if (IP_CLASSC(ip)) { \ if(!IS_VALID_CLASSC_SUBNET_MASK(mask)) { \ DHCPS_LOG("dhcps: The subnet mask does not match the C address.\n"); \ return ERR_ARG; \ } \ } \ } \ } while (0) #define MAX_STATION_NUM CONFIG_LWIP_DHCPS_MAX_STATION_NUM #define DHCPS_STATE_OFFER 1 #define DHCPS_STATE_DECLINE 2 #define DHCPS_STATE_ACK 3 #define DHCPS_STATE_NAK 4 #define DHCPS_STATE_IDLE 5 #define DHCPS_STATE_RELEASE 6 typedef struct _list_node { void *pnode; struct _list_node *pnext; } list_node; //////////////////////////////////////////////////////////////////////////////////// static const u32_t magic_cookie = 0x63538263; static struct netif *dhcps_netif = NULL; static ip4_addr_t broadcast_dhcps; static ip4_addr_t server_address; static ip4_addr_t dns_server = {0}; static ip4_addr_t client_address; //added static ip4_addr_t client_address_plus; static ip4_addr_t s_dhcps_mask = { #ifdef USE_CLASS_B_NET .addr = PP_HTONL(LWIP_MAKEU32(255, 240, 0, 0)) #else .addr = PP_HTONL(LWIP_MAKEU32(255, 255, 255, 0)) #endif }; static list_node *plist = NULL; static bool renew = false; static dhcps_lease_t dhcps_poll; static dhcps_time_t dhcps_lease_time = DHCPS_LEASE_TIME_DEF; //minute static dhcps_offer_t dhcps_offer = 0xFF; static dhcps_offer_t dhcps_dns = 0x00; static dhcps_cb_t dhcps_cb; /****************************************************************************** * FunctionName : dhcps_option_info * Description : get the DHCP message option info * Parameters : op_id -- DHCP message option id * opt_len -- DHCP message option length * Returns : DHCP message option addr *******************************************************************************/ void *dhcps_option_info(u8_t op_id, u32_t opt_len) { void *option_arg = NULL; switch (op_id) { case IP_ADDRESS_LEASE_TIME: if (opt_len == sizeof(dhcps_time_t)) { option_arg = &dhcps_lease_time; } break; case REQUESTED_IP_ADDRESS: if (opt_len == sizeof(dhcps_lease_t)) { option_arg = &dhcps_poll; } break; case ROUTER_SOLICITATION_ADDRESS: if (opt_len == sizeof(dhcps_offer_t)) { option_arg = &dhcps_offer; } break; case DOMAIN_NAME_SERVER: if (opt_len == sizeof(dhcps_offer_t)) { option_arg = &dhcps_dns; } break; case SUBNET_MASK: if (opt_len == sizeof(s_dhcps_mask)) { option_arg = &s_dhcps_mask; } break; default: break; } return option_arg; } /****************************************************************************** * FunctionName : dhcps_set_option_info * Description : set the DHCP message option info * Parameters : op_id -- DHCP message option id * opt_info -- DHCP message option info * opt_len -- DHCP message option length * Returns : none *******************************************************************************/ void dhcps_set_option_info(u8_t op_id, void *opt_info, u32_t opt_len) { if (opt_info == NULL) { return; } switch (op_id) { case IP_ADDRESS_LEASE_TIME: if (opt_len == sizeof(dhcps_time_t)) { dhcps_lease_time = *(dhcps_time_t *)opt_info; } break; case REQUESTED_IP_ADDRESS: if (opt_len == sizeof(dhcps_lease_t)) { dhcps_poll = *(dhcps_lease_t *)opt_info; } break; case ROUTER_SOLICITATION_ADDRESS: if (opt_len == sizeof(dhcps_offer_t)) { dhcps_offer = *(dhcps_offer_t *)opt_info; } break; case DOMAIN_NAME_SERVER: if (opt_len == sizeof(dhcps_offer_t)) { dhcps_dns = *(dhcps_offer_t *)opt_info; } break; case SUBNET_MASK: if (opt_len == sizeof(s_dhcps_mask)) { s_dhcps_mask = *(ip4_addr_t *)opt_info; } default: break; } return; } /****************************************************************************** * FunctionName : node_insert_to_list * Description : insert the node to the list * Parameters : phead -- the head node of the list * pinsert -- the insert node of the list * Returns : none *******************************************************************************/ static void node_insert_to_list(list_node **phead, list_node *pinsert) { list_node *plist = NULL; struct dhcps_pool *pdhcps_pool = NULL; struct dhcps_pool *pdhcps_node = NULL; if (*phead == NULL) { *phead = pinsert; } else { plist = *phead; pdhcps_node = pinsert->pnode; pdhcps_pool = plist->pnode; if (pdhcps_node->ip.addr < pdhcps_pool->ip.addr) { pinsert->pnext = plist; *phead = pinsert; } else { while (plist->pnext != NULL) { pdhcps_pool = plist->pnext->pnode; if (pdhcps_node->ip.addr < pdhcps_pool->ip.addr) { pinsert->pnext = plist->pnext; plist->pnext = pinsert; break; } plist = plist->pnext; } if (plist->pnext == NULL) { plist->pnext = pinsert; } } } // pinsert->pnext = NULL; } /****************************************************************************** * FunctionName : node_delete_from_list * Description : remove the node from list * Parameters : phead -- the head node of the list * pdelete -- the remove node of the list * Returns : none *******************************************************************************/ void node_remove_from_list(list_node **phead, list_node *pdelete) { list_node *plist = NULL; plist = *phead; if (plist == NULL) { *phead = NULL; } else { if (plist == pdelete) { // Note: Ignoring the "use after free" warnings, as it could only happen // if the linked list contains loops *phead = plist->pnext; // NOLINT(clang-analyzer-unix.Malloc) pdelete->pnext = NULL; } else { while (plist != NULL) { if (plist->pnext == pdelete) { // NOLINT(clang-analyzer-unix.Malloc) plist->pnext = pdelete->pnext; pdelete->pnext = NULL; } plist = plist->pnext; } } } } /****************************************************************************** * FunctionName : add_msg_type * Description : add TYPE option of DHCP message * Parameters : optptr -- the addr of DHCP message option * Returns : the addr of DHCP message option *******************************************************************************/ static u8_t *add_msg_type(u8_t *optptr, u8_t type) { *optptr++ = DHCP_OPTION_MSG_TYPE; *optptr++ = 1; *optptr++ = type; return optptr; } /****************************************************************************** * FunctionName : add_offer_options * Description : add OFFER option of DHCP message * Parameters : optptr -- the addr of DHCP message option * Returns : the addr of DHCP message option *******************************************************************************/ static u8_t *add_offer_options(u8_t *optptr) { ip4_addr_t ipadd; ipadd.addr = *((u32_t *) &server_address); *optptr++ = DHCP_OPTION_SUBNET_MASK; *optptr++ = 4; *optptr++ = ip4_addr1(&s_dhcps_mask); *optptr++ = ip4_addr2(&s_dhcps_mask); *optptr++ = ip4_addr3(&s_dhcps_mask); *optptr++ = ip4_addr4(&s_dhcps_mask); *optptr++ = DHCP_OPTION_LEASE_TIME; *optptr++ = 4; *optptr++ = ((dhcps_lease_time * DHCPS_LEASE_UNIT) >> 24) & 0xFF; *optptr++ = ((dhcps_lease_time * DHCPS_LEASE_UNIT) >> 16) & 0xFF; *optptr++ = ((dhcps_lease_time * DHCPS_LEASE_UNIT) >> 8) & 0xFF; *optptr++ = ((dhcps_lease_time * DHCPS_LEASE_UNIT) >> 0) & 0xFF; *optptr++ = DHCP_OPTION_SERVER_ID; *optptr++ = 4; *optptr++ = ip4_addr1(&ipadd); *optptr++ = ip4_addr2(&ipadd); *optptr++ = ip4_addr3(&ipadd); *optptr++ = ip4_addr4(&ipadd); if (dhcps_router_enabled(dhcps_offer)) { esp_netif_ip_info_t if_ip; memset(&if_ip , 0x00, sizeof(esp_netif_ip_info_t)); esp_netif_get_ip_info(dhcps_netif->state, &if_ip); ip4_addr_t* gw_ip = (ip4_addr_t*)&if_ip.gw; if (!ip4_addr_isany_val(*gw_ip)) { *optptr++ = DHCP_OPTION_ROUTER; *optptr++ = 4; *optptr++ = ip4_addr1(gw_ip); *optptr++ = ip4_addr2(gw_ip); *optptr++ = ip4_addr3(gw_ip); *optptr++ = ip4_addr4(gw_ip); } } *optptr++ = DHCP_OPTION_DNS_SERVER; *optptr++ = 4; if (dhcps_dns_enabled(dhcps_dns)) { *optptr++ = ip4_addr1(&dns_server); *optptr++ = ip4_addr2(&dns_server); *optptr++ = ip4_addr3(&dns_server); *optptr++ = ip4_addr4(&dns_server); }else { *optptr++ = ip4_addr1(&ipadd); *optptr++ = ip4_addr2(&ipadd); *optptr++ = ip4_addr3(&ipadd); *optptr++ = ip4_addr4(&ipadd); } ip4_addr_t broadcast_addr = { .addr = (ipadd.addr & s_dhcps_mask.addr) | ~s_dhcps_mask.addr }; *optptr++ = DHCP_OPTION_BROADCAST_ADDRESS; *optptr++ = 4; *optptr++ = ip4_addr1(&broadcast_addr); *optptr++ = ip4_addr2(&broadcast_addr); *optptr++ = ip4_addr3(&broadcast_addr); *optptr++ = ip4_addr4(&broadcast_addr); *optptr++ = DHCP_OPTION_INTERFACE_MTU; *optptr++ = 2; *optptr++ = 0x05; *optptr++ = 0xdc; *optptr++ = DHCP_OPTION_PERFORM_ROUTER_DISCOVERY; *optptr++ = 1; *optptr++ = 0x00; *optptr++ = 43; *optptr++ = 6; *optptr++ = 0x01; *optptr++ = 4; *optptr++ = 0x00; *optptr++ = 0x00; *optptr++ = 0x00; *optptr++ = 0x02; return optptr; } /****************************************************************************** * FunctionName : add_end * Description : add end option of DHCP message * Parameters : optptr -- the addr of DHCP message option * Returns : the addr of DHCP message option *******************************************************************************/ static u8_t *add_end(u8_t *optptr) { *optptr++ = DHCP_OPTION_END; return optptr; } /****************************************************************************** * FunctionName : create_msg * Description : create response message * Parameters : m -- DHCP message info * Returns : none *******************************************************************************/ static void create_msg(struct dhcps_msg *m) { ip4_addr_t client; client.addr = *((uint32_t *) &client_address); m->op = DHCP_REPLY; m->htype = DHCP_HTYPE_ETHERNET; m->hlen = 6; m->hops = 0; // os_memcpy((char *) xid, (char *) m->xid, sizeof(m->xid)); m->secs = 0; m->flags = htons(BOOTP_BROADCAST); memcpy((char *) m->yiaddr, (char *) &client.addr, sizeof(m->yiaddr)); memset((char *) m->ciaddr, 0, sizeof(m->ciaddr)); memset((char *) m->siaddr, 0, sizeof(m->siaddr)); memset((char *) m->giaddr, 0, sizeof(m->giaddr)); memset((char *) m->sname, 0, sizeof(m->sname)); memset((char *) m->file, 0, sizeof(m->file)); memset((char *) m->options, 0, sizeof(m->options)); u32_t magic_cookie_temp = magic_cookie; memcpy((char *) m->options, &magic_cookie_temp, sizeof(magic_cookie_temp)); } struct pbuf * dhcps_pbuf_alloc(u16_t len) { u16_t mlen = sizeof(struct dhcps_msg); if (len > mlen) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: len=%d mlen=%d", len, mlen); #endif mlen = len; } return pbuf_alloc(PBUF_TRANSPORT, mlen, PBUF_RAM); } /****************************************************************************** * FunctionName : send_offer * Description : DHCP message OFFER Response * Parameters : m -- DHCP message info * Returns : none *******************************************************************************/ static void send_offer(struct dhcps_msg *m, u16_t len) { u8_t *end; struct pbuf *p, *q; u8_t *data; u16_t cnt = 0; u16_t i; #if DHCPS_DEBUG err_t SendOffer_err_t; #endif create_msg(m); end = add_msg_type(&m->options[4], DHCPOFFER); end = add_offer_options(end); end = add_end(end); p = dhcps_pbuf_alloc(len); #if DHCPS_DEBUG DHCPS_LOG("udhcp: send_offer>>p->ref = %d\n", p->ref); #endif if (p != NULL) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: send_offer>>pbuf_alloc succeed\n"); DHCPS_LOG("dhcps: send_offer>>p->tot_len = %d\n", p->tot_len); DHCPS_LOG("dhcps: send_offer>>p->len = %d\n", p->len); #endif q = p; while (q != NULL) { data = (u8_t *)q->payload; for (i = 0; i < q->len; i++) { data[i] = ((u8_t *) m)[cnt++]; #if DHCPS_DEBUG DHCPS_LOG("%02x ", data[i]); if ((i + 1) % 16 == 0) { DHCPS_LOG("\n"); } #endif } q = q->next; } } else { #if DHCPS_DEBUG DHCPS_LOG("dhcps: send_offer>>pbuf_alloc failed\n"); #endif return; } ip_addr_t ip_temp = IPADDR4_INIT(0x0); ip4_addr_set(ip_2_ip4(&ip_temp), &broadcast_dhcps); struct udp_pcb *pcb_dhcps = dhcps_netif->dhcps_pcb; #if DHCPS_DEBUG SendOffer_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT); DHCPS_LOG("dhcps: send_offer>>udp_sendto result %x\n", SendOffer_err_t); #else udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT); #endif if (p->ref != 0) { #if DHCPS_DEBUG DHCPS_LOG("udhcp: send_offer>>free pbuf\n"); #endif pbuf_free(p); } } /****************************************************************************** * FunctionName : send_nak * Description : DHCP message NACK Response * Parameters : m -- DHCP message info * Returns : none *******************************************************************************/ static void send_nak(struct dhcps_msg *m, u16_t len) { u8_t *end; struct pbuf *p, *q; u8_t *data; u16_t cnt = 0; u16_t i; #if DHCPS_DEBUG err_t SendNak_err_t; #endif create_msg(m); end = add_msg_type(&m->options[4], DHCPNAK); end = add_end(end); p = dhcps_pbuf_alloc(len); #if DHCPS_DEBUG DHCPS_LOG("udhcp: send_nak>>p->ref = %d\n", p->ref); #endif if (p != NULL) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: send_nak>>pbuf_alloc succeed\n"); DHCPS_LOG("dhcps: send_nak>>p->tot_len = %d\n", p->tot_len); DHCPS_LOG("dhcps: send_nak>>p->len = %d\n", p->len); #endif q = p; while (q != NULL) { data = (u8_t *)q->payload; for (i = 0; i < q->len; i++) { data[i] = ((u8_t *) m)[cnt++]; #if DHCPS_DEBUG DHCPS_LOG("%02x ", data[i]); if ((i + 1) % 16 == 0) { DHCPS_LOG("\n"); } #endif } q = q->next; } } else { #if DHCPS_DEBUG DHCPS_LOG("dhcps: send_nak>>pbuf_alloc failed\n"); #endif return; } ip_addr_t ip_temp = IPADDR4_INIT(0x0); ip4_addr_set(ip_2_ip4(&ip_temp), &broadcast_dhcps); struct udp_pcb *pcb_dhcps = dhcps_netif->dhcps_pcb; #if DHCPS_DEBUG SendNak_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT); DHCPS_LOG("dhcps: send_nak>>udp_sendto result %x\n", SendNak_err_t); #else udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT); #endif if (p->ref != 0) { #if DHCPS_DEBUG DHCPS_LOG("udhcp: send_nak>>free pbuf\n"); #endif pbuf_free(p); } } /****************************************************************************** * FunctionName : send_ack * Description : DHCP message ACK Response * Parameters : m -- DHCP message info * Returns : none *******************************************************************************/ static void send_ack(struct dhcps_msg *m, u16_t len) { u8_t *end; struct pbuf *p, *q; u8_t *data; u16_t cnt = 0; u16_t i; err_t SendAck_err_t; create_msg(m); end = add_msg_type(&m->options[4], DHCPACK); end = add_offer_options(end); end = add_end(end); p = dhcps_pbuf_alloc(len); #if DHCPS_DEBUG DHCPS_LOG("udhcp: send_ack>>p->ref = %d\n", p->ref); #endif if (p != NULL) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: send_ack>>pbuf_alloc succeed\n"); DHCPS_LOG("dhcps: send_ack>>p->tot_len = %d\n", p->tot_len); DHCPS_LOG("dhcps: send_ack>>p->len = %d\n", p->len); #endif q = p; while (q != NULL) { data = (u8_t *)q->payload; for (i = 0; i < q->len; i++) { data[i] = ((u8_t *) m)[cnt++]; #if DHCPS_DEBUG DHCPS_LOG("%02x ", data[i]); if ((i + 1) % 16 == 0) { DHCPS_LOG("\n"); } #endif } q = q->next; } } else { #if DHCPS_DEBUG DHCPS_LOG("dhcps: send_ack>>pbuf_alloc failed\n"); #endif return; } ip_addr_t ip_temp = IPADDR4_INIT(0x0); ip4_addr_set(ip_2_ip4(&ip_temp), &broadcast_dhcps); struct udp_pcb *pcb_dhcps = dhcps_netif->dhcps_pcb; SendAck_err_t = udp_sendto(pcb_dhcps, p, &ip_temp, DHCPS_CLIENT_PORT); #if DHCPS_DEBUG DHCPS_LOG("dhcps: send_ack>>udp_sendto result %x\n", SendAck_err_t); #endif if (SendAck_err_t == ERR_OK) { dhcps_cb(m->yiaddr); } if (p->ref != 0) { #if DHCPS_DEBUG DHCPS_LOG("udhcp: send_ack>>free pbuf\n"); #endif pbuf_free(p); } } /****************************************************************************** * FunctionName : parse_options * Description : parse DHCP message options * Parameters : optptr -- DHCP message option info * len -- DHCP message option length * Returns : none *******************************************************************************/ static u8_t parse_options(u8_t *optptr, s16_t len) { ip4_addr_t client; bool is_dhcp_parse_end = false; struct dhcps_state s; client.addr = *((uint32_t *) &client_address); u8_t *end = optptr + len; u16_t type = 0; s.state = DHCPS_STATE_IDLE; while (optptr < end) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: (s16_t)*optptr = %d\n", (s16_t)*optptr); #endif switch ((s16_t) *optptr) { case DHCP_OPTION_MSG_TYPE: //53 type = *(optptr + 2); break; case DHCP_OPTION_REQ_IPADDR://50 if (memcmp((char *) &client.addr, (char *) optptr + 2, 4) == 0) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: DHCP_OPTION_REQ_IPADDR = 0 ok\n"); #endif s.state = DHCPS_STATE_ACK; } else { #if DHCPS_DEBUG DHCPS_LOG("dhcps: DHCP_OPTION_REQ_IPADDR != 0 err\n"); #endif s.state = DHCPS_STATE_NAK; } break; case DHCP_OPTION_END: { is_dhcp_parse_end = true; } break; } if (is_dhcp_parse_end) { break; } optptr += optptr[1] + 2; } switch (type) { case DHCPDISCOVER://1 s.state = DHCPS_STATE_OFFER; #if DHCPS_DEBUG DHCPS_LOG("dhcps: DHCPD_STATE_OFFER\n"); #endif break; case DHCPREQUEST://3 if (!(s.state == DHCPS_STATE_ACK || s.state == DHCPS_STATE_NAK)) { if (renew == true) { s.state = DHCPS_STATE_ACK; } else { s.state = DHCPS_STATE_NAK; } #if DHCPS_DEBUG DHCPS_LOG("dhcps: DHCPD_STATE_NAK\n"); #endif } break; case DHCPDECLINE://4 s.state = DHCPS_STATE_IDLE; #if DHCPS_DEBUG DHCPS_LOG("dhcps: DHCPD_STATE_IDLE\n"); #endif break; case DHCPRELEASE://7 s.state = DHCPS_STATE_RELEASE; #if DHCPS_DEBUG DHCPS_LOG("dhcps: DHCPD_STATE_IDLE\n"); #endif break; } #if DHCPS_DEBUG DHCPS_LOG("dhcps: return s.state = %d\n", s.state); #endif return s.state; } /****************************************************************************** * FunctionName : parse_msg * Description : parse DHCP message from netif * Parameters : m -- DHCP message info * len -- DHCP message length * Returns : DHCP message type *******************************************************************************/ static s16_t parse_msg(struct dhcps_msg *m, u16_t len) { u32_t lease_timer = (dhcps_lease_time * DHCPS_LEASE_UNIT)/DHCPS_COARSE_TIMER_SECS; if (memcmp((char *)m->options, &magic_cookie, sizeof(magic_cookie)) == 0) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: len = %d\n", len); #endif ip4_addr_t addr_tmp; struct dhcps_pool *pdhcps_pool = NULL; list_node *pnode = NULL; list_node *pback_node = NULL; ip4_addr_t first_address; bool flag = false; first_address.addr = dhcps_poll.start_ip.addr; client_address.addr = client_address_plus.addr; renew = false; if (plist != NULL) { for (pback_node = plist; pback_node != NULL; pback_node = pback_node->pnext) { pdhcps_pool = pback_node->pnode; if (memcmp(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac)) == 0) { if (memcmp(&pdhcps_pool->ip.addr, m->ciaddr, sizeof(pdhcps_pool->ip.addr)) == 0) { renew = true; } client_address.addr = pdhcps_pool->ip.addr; pdhcps_pool->lease_timer = lease_timer; pnode = pback_node; goto POOL_CHECK; } else if (pdhcps_pool->ip.addr == client_address_plus.addr) { addr_tmp.addr = htonl(client_address_plus.addr); addr_tmp.addr++; client_address_plus.addr = htonl(addr_tmp.addr); client_address.addr = client_address_plus.addr; } if (flag == false) { // search the fisrt unused ip if (first_address.addr < pdhcps_pool->ip.addr) { flag = true; } else { addr_tmp.addr = htonl(first_address.addr); addr_tmp.addr++; first_address.addr = htonl(addr_tmp.addr); } } } } else { client_address.addr = dhcps_poll.start_ip.addr; } if (client_address_plus.addr > dhcps_poll.end_ip.addr) { client_address.addr = first_address.addr; } if (client_address.addr > dhcps_poll.end_ip.addr) { client_address_plus.addr = dhcps_poll.start_ip.addr; pdhcps_pool = NULL; pnode = NULL; } else { pdhcps_pool = (struct dhcps_pool *)mem_malloc(sizeof(struct dhcps_pool)); memset(pdhcps_pool , 0x00 , sizeof(struct dhcps_pool)); pdhcps_pool->ip.addr = client_address.addr; memcpy(pdhcps_pool->mac, m->chaddr, sizeof(pdhcps_pool->mac)); pdhcps_pool->lease_timer = lease_timer; pnode = (list_node *)mem_malloc(sizeof(list_node)); memset(pnode , 0x00 , sizeof(list_node)); pnode->pnode = pdhcps_pool; pnode->pnext = NULL; node_insert_to_list(&plist, pnode); if (client_address.addr == dhcps_poll.end_ip.addr) { client_address_plus.addr = dhcps_poll.start_ip.addr; } else { addr_tmp.addr = htonl(client_address.addr); addr_tmp.addr++; client_address_plus.addr = htonl(addr_tmp.addr); } } POOL_CHECK: if ((client_address.addr > dhcps_poll.end_ip.addr) || (ip4_addr_isany(&client_address))) { if (pnode != NULL) { node_remove_from_list(&plist, pnode); free(pnode); pnode = NULL; } if (pdhcps_pool != NULL) { free(pdhcps_pool); pdhcps_pool = NULL; } return 4; } s16_t ret = parse_options(&m->options[4], len);; if (ret == DHCPS_STATE_RELEASE) { if (pnode != NULL) { node_remove_from_list(&plist, pnode); free(pnode); pnode = NULL; } if (pdhcps_pool != NULL) { free(pdhcps_pool); pdhcps_pool = NULL; } memset(&client_address, 0x0, sizeof(client_address)); } #if DHCPS_DEBUG DHCPS_LOG("dhcps: xid changed\n"); DHCPS_LOG("dhcps: client_address.addr = %x\n", client_address.addr); #endif return ret; } return 0; } /****************************************************************************** * FunctionName : handle_dhcp * Description : If an incoming DHCP message is in response to us, then trigger the state machine * Parameters : arg -- arg user supplied argument (udp_pcb.recv_arg) * pcb -- the udp_pcb which received data * p -- the packet buffer that was received * addr -- the remote IP address from which the packet was received * port -- the remote port from which the packet was received * Returns : none *******************************************************************************/ static void handle_dhcp(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port) { struct dhcps_msg *pmsg_dhcps = NULL; s16_t tlen, malloc_len; u16_t i; u16_t dhcps_msg_cnt = 0; u8_t *p_dhcps_msg = NULL; u8_t *data; #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> receive a packet\n"); #endif if (p == NULL) { return; } malloc_len = sizeof(struct dhcps_msg); #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp malloc_len=%d rx_len=%d", malloc_len, p->tot_len); #endif if (malloc_len < p->tot_len) { malloc_len = p->tot_len; } pmsg_dhcps = (struct dhcps_msg *)mem_malloc(malloc_len); if (NULL == pmsg_dhcps) { pbuf_free(p); return; } memset(pmsg_dhcps , 0x00 , malloc_len); p_dhcps_msg = (u8_t *)pmsg_dhcps; tlen = p->tot_len; data = p->payload; #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> p->tot_len = %d\n", tlen); DHCPS_LOG("dhcps: handle_dhcp-> p->len = %d\n", p->len); #endif for (i = 0; i < p->len; i++) { p_dhcps_msg[dhcps_msg_cnt++] = data[i]; #if DHCPS_DEBUG DHCPS_LOG("%02x ", data[i]); if ((i + 1) % 16 == 0) { DHCPS_LOG("\n"); } #endif } if (p->next != NULL) { #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> p->next != NULL\n"); DHCPS_LOG("dhcps: handle_dhcp-> p->next->tot_len = %d\n", p->next->tot_len); DHCPS_LOG("dhcps: handle_dhcp-> p->next->len = %d\n", p->next->len); #endif data = p->next->payload; for (i = 0; i < p->next->len; i++) { p_dhcps_msg[dhcps_msg_cnt++] = data[i]; #if DHCPS_DEBUG DHCPS_LOG("%02x ", data[i]); if ((i + 1) % 16 == 0) { DHCPS_LOG("\n"); } #endif } } #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> parse_msg(p)\n"); #endif switch (parse_msg(pmsg_dhcps, tlen - 240)) { case DHCPS_STATE_OFFER://1 #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_OFFER\n"); #endif send_offer(pmsg_dhcps, malloc_len); break; case DHCPS_STATE_ACK://3 #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_ACK\n"); #endif send_ack(pmsg_dhcps, malloc_len); break; case DHCPS_STATE_NAK://4 #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_NAK\n"); #endif send_nak(pmsg_dhcps, malloc_len); break; default : break; } #if DHCPS_DEBUG DHCPS_LOG("dhcps: handle_dhcp-> pbuf_free(p)\n"); #endif pbuf_free(p); free(pmsg_dhcps); pmsg_dhcps = NULL; } /****************************************************************************** * FunctionName : dhcps_poll_set * Description : set ip poll from start to end for station * Parameters : ip -- The current ip addr * Returns : none *******************************************************************************/ static void dhcps_poll_set(u32_t ip) { u32_t softap_ip = 0, local_ip = 0; u32_t start_ip = 0; u32_t end_ip = 0; u32_t temp_local_ip = 0; u32_t host_num = 0; if (dhcps_poll.enable == true) { softap_ip = htonl(ip); start_ip = htonl(dhcps_poll.start_ip.addr); end_ip = htonl(dhcps_poll.end_ip.addr); /*config ip information can't contain local ip*/ if ((start_ip <= softap_ip) && (softap_ip <= end_ip)) { dhcps_poll.enable = false; } else { /*config ip information must be in the same segment as the local ip*/ softap_ip >>= 8; if (((start_ip >> 8 != softap_ip) || (end_ip >> 8 != softap_ip)) || (end_ip - start_ip > DHCPS_MAX_LEASE)) { dhcps_poll.enable = false; } } } if (dhcps_poll.enable == false) { local_ip = softap_ip = htonl(ip); softap_ip &= 0xFFFFFF00; temp_local_ip = local_ip &= 0xFF; if (local_ip >= 0x80) { local_ip -= DHCPS_MAX_LEASE; temp_local_ip -= DHCPS_MAX_LEASE; } else { local_ip ++; } bzero(&dhcps_poll, sizeof(dhcps_poll)); host_num = IP_CLASS_HOST_NUM(htonl(s_dhcps_mask.addr)); if (host_num > DHCPS_MAX_LEASE) { host_num = DHCPS_MAX_LEASE; } dhcps_poll.start_ip.addr = softap_ip | local_ip; dhcps_poll.end_ip.addr = softap_ip | (temp_local_ip + host_num - 1); dhcps_poll.start_ip.addr = htonl(dhcps_poll.start_ip.addr); dhcps_poll.end_ip.addr = htonl(dhcps_poll.end_ip.addr); } } /****************************************************************************** * FunctionName : dhcps_set_new_lease_cb * Description : set callback for dhcp server when it assign an IP * to the connected dhcp client * Parameters : cb -- callback for dhcp server * Returns : none *******************************************************************************/ void dhcps_set_new_lease_cb(dhcps_cb_t cb) { dhcps_cb = cb; } /****************************************************************************** * FunctionName : dhcps_start * Description : start dhcp server function * Parameters : netif -- The current netif addr * : info -- The current ip info * Returns : none *******************************************************************************/ err_t dhcps_start(struct netif *netif, ip4_addr_t ip) { if (netif == NULL) { return ERR_ARG; } dhcps_netif = netif; if (dhcps_netif->dhcps_pcb != NULL) { udp_remove(dhcps_netif->dhcps_pcb); } dhcps_netif->dhcps_pcb = udp_new(); struct udp_pcb *pcb_dhcps = dhcps_netif->dhcps_pcb; if (pcb_dhcps == NULL || ip4_addr_isany_val(ip)) { printf("dhcps_start(): could not obtain pcb\n"); return ERR_ARG; } dhcps_netif->dhcps_pcb = pcb_dhcps; IP4_ADDR(&broadcast_dhcps, 255, 255, 255, 255); server_address.addr = ip.addr; DHCP_CHECK_SUBNET_MASK_IP(htonl(s_dhcps_mask.addr), htonl(server_address.addr)); dhcps_poll_set(server_address.addr); client_address_plus.addr = dhcps_poll.start_ip.addr; udp_bind(pcb_dhcps, &netif->ip_addr, DHCPS_SERVER_PORT); udp_recv(pcb_dhcps, handle_dhcp, NULL); #if DHCPS_DEBUG DHCPS_LOG("dhcps:dhcps_start->udp_recv function Set a receive callback handle_dhcp for UDP_PCB pcb_dhcps\n"); #endif return ERR_OK; } /****************************************************************************** * FunctionName : dhcps_stop * Description : stop dhcp server function * Parameters : netif -- The current netif addr * Returns : none *******************************************************************************/ void dhcps_stop(struct netif *netif) { struct netif *apnetif = netif; if (apnetif == NULL) { printf("dhcps_stop: apnetif == NULL\n"); return; } if (apnetif->dhcps_pcb != NULL) { udp_disconnect(apnetif->dhcps_pcb); udp_remove(apnetif->dhcps_pcb); apnetif->dhcps_pcb = NULL; } list_node *pnode = NULL; list_node *pback_node = NULL; pnode = plist; while (pnode != NULL) { pback_node = pnode; pnode = pback_node->pnext; node_remove_from_list(&plist, pback_node); free(pback_node->pnode); pback_node->pnode = NULL; free(pback_node); pback_node = NULL; } } /****************************************************************************** * FunctionName : kill_oldest_dhcps_pool * Description : remove the oldest node from list * Parameters : none * Returns : none *******************************************************************************/ static void kill_oldest_dhcps_pool(void) { list_node *pre = NULL, *p = NULL; list_node *minpre = NULL, *minp = NULL; struct dhcps_pool *pdhcps_pool = NULL, *pmin_pool = NULL; pre = plist; assert(pre != NULL && pre->pnext != NULL); // Expect the list to have at least 2 nodes p = pre->pnext; minpre = pre; minp = p; while (p != NULL) { pdhcps_pool = p->pnode; pmin_pool = minp->pnode; if (pdhcps_pool->lease_timer < pmin_pool->lease_timer) { minp = p; minpre = pre; } pre = p; p = p->pnext; } minpre->pnext = minp->pnext; free(minp->pnode); minp->pnode = NULL; free(minp); minp = NULL; } /****************************************************************************** * FunctionName : dhcps_coarse_tmr * Description : the lease time count * Parameters : none * Returns : none *******************************************************************************/ void dhcps_coarse_tmr(void) { u8_t num_dhcps_pool = 0; list_node *pback_node = NULL; list_node *pnode = NULL; struct dhcps_pool *pdhcps_pool = NULL; pnode = plist; while (pnode != NULL) { pdhcps_pool = pnode->pnode; pdhcps_pool->lease_timer --; if (pdhcps_pool->lease_timer == 0) { pback_node = pnode; pnode = pback_node->pnext; node_remove_from_list(&plist, pback_node); free(pback_node->pnode); pback_node->pnode = NULL; free(pback_node); pback_node = NULL; } else { pnode = pnode ->pnext; num_dhcps_pool ++; } } if (num_dhcps_pool > MAX_STATION_NUM) { kill_oldest_dhcps_pool(); } } /****************************************************************************** * FunctionName : dhcp_search_ip_on_mac * Description : Search ip address based on mac address * Parameters : mac -- The MAC addr * ip -- The IP info * Returns : true or false *******************************************************************************/ bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip) { struct dhcps_pool *pdhcps_pool = NULL; list_node *pback_node = NULL; bool ret = false; for (pback_node = plist; pback_node != NULL; pback_node = pback_node->pnext) { pdhcps_pool = pback_node->pnode; if (memcmp(pdhcps_pool->mac, mac, sizeof(pdhcps_pool->mac)) == 0) { memcpy(&ip->addr, &pdhcps_pool->ip.addr, sizeof(pdhcps_pool->ip.addr)); ret = true; break; } } return ret; } /****************************************************************************** * FunctionName : dhcps_dns_setserver * Description : set DNS server address for dhcpserver * Parameters : dnsserver -- The DNS server address * Returns : none *******************************************************************************/ void dhcps_dns_setserver(const ip_addr_t *dnsserver) { if (dnsserver != NULL) { dns_server = *(ip_2_ip4(dnsserver)); } else { dns_server = *(ip_2_ip4(IP_ADDR_ANY)); } } /****************************************************************************** * FunctionName : dhcps_dns_getserver * Description : get DNS server address for dhcpserver * Parameters : none * Returns : ip4_addr_t *******************************************************************************/ ip4_addr_t dhcps_dns_getserver(void) { return dns_server; } #endif // ESP_DHCP