EthernetInterface.cpp

00001 /* EthernetInterface.cpp */
00002 /* Copyright (C) 2012 mbed.org, MIT License
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00005  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00006  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00007  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00008  * furnished to do so, subject to the following conditions:
00009  *
00010  * The above copyright notice and this permission notice shall be included in all copies or
00011  * substantial portions of the Software.
00012  *
00013  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00014  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00015  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00016  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00017  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00018  */
00019 #include "EthernetInterface.h"
00020 
00021 #include "lwip/inet.h"
00022 #include "lwip/netif.h"
00023 #include "netif/etharp.h"
00024 #include "lwip/dhcp.h"
00025 #include "eth_arch.h"
00026 #include "lwip/tcpip.h"
00027 
00028 #include "mbed.h"
00029 
00030 /* TCP/IP and Network Interface Initialisation */
00031 static struct netif netif;
00032 
00033 static char mac_addr[19];
00034 static char ip_addr[17] = "\0";
00035 static char gateway[17] = "\0";
00036 static char networkmask[17] = "\0";
00037 static bool use_dhcp = false;
00038 
00039 static Semaphore tcpip_inited(0);
00040 static Semaphore netif_linked(0);
00041 static Semaphore netif_up(0);
00042 
00043 static char myName[33];  // holds the name, when setName() is called.
00044 
00045 static void tcpip_init_done(void *arg) {
00046     tcpip_inited.release();
00047 }
00048 
00049 static void netif_link_callback(struct netif *netif) {
00050     if (netif_is_link_up(netif)) {
00051         netif_linked.release();
00052     }
00053 }
00054 
00055 static void netif_status_callback(struct netif *netif) {
00056     if (netif_is_up(netif)) {
00057         strcpy(ip_addr, inet_ntoa(netif->ip_addr));
00058         strcpy(gateway, inet_ntoa(netif->gw));
00059         strcpy(networkmask, inet_ntoa(netif->netmask));
00060         netif_up.release();
00061     }
00062 }
00063 
00064 static void init_netif(ip_addr_t *ipaddr, ip_addr_t *netmask, ip_addr_t *gw) {
00065     tcpip_init(tcpip_init_done, NULL);
00066     tcpip_inited.wait();
00067     
00068     memset((void*) &netif, 0, sizeof(netif));
00069     netif_add(&netif, ipaddr, netmask, gw, NULL, eth_arch_enetif_init, tcpip_input);
00070     netif_set_default(&netif);
00071     
00072     netif_set_link_callback  (&netif, netif_link_callback);
00073     netif_set_status_callback(&netif, netif_status_callback);
00074 }
00075 
00076 static void set_mac_address(void) {
00077 #if (MBED_MAC_ADDRESS_SUM != MBED_MAC_ADDR_INTERFACE)
00078     snprintf(mac_addr, 19, "%02x:%02x:%02x:%02x:%02x:%02x", MBED_MAC_ADDR_0, MBED_MAC_ADDR_1, MBED_MAC_ADDR_2,
00079              MBED_MAC_ADDR_3, MBED_MAC_ADDR_4, MBED_MAC_ADDR_5);
00080 #else
00081     char mac[6];
00082     mbed_mac_address(mac);
00083     snprintf(mac_addr, 19, "%02x:%02x:%02x:%02x:%02x:%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
00084 #endif
00085 }
00086 
00087 int EthernetInterface::init() {
00088     use_dhcp = true;
00089     set_mac_address();
00090     init_netif(NULL, NULL, NULL);
00091     return 0;
00092 }
00093 
00094 int EthernetInterface::init(const char* ip, const char* mask, const char* gateway) {
00095     use_dhcp = false;
00096     
00097     set_mac_address();
00098     strcpy(ip_addr, ip);
00099     
00100     ip_addr_t ip_n, mask_n, gateway_n;
00101     inet_aton(ip, &ip_n);
00102     inet_aton(mask, &mask_n);
00103     inet_aton(gateway, &gateway_n);
00104     init_netif(&ip_n, &mask_n, &gateway_n);
00105     
00106     return 0;
00107 }
00108 
00109 int EthernetInterface::connect(unsigned int timeout_ms) {
00110     eth_arch_enable_interrupts();
00111 
00112     int inited;
00113     if (use_dhcp) {
00114         dhcp_start(&netif);
00115         
00116         // Wait for an IP Address
00117         // -1: error, 0: timeout
00118         inited = netif_up.wait(timeout_ms);
00119     } else {
00120         netif_set_up(&netif);
00121         
00122         // Wait for the link up
00123         inited = netif_linked.wait(timeout_ms);
00124     }
00125     
00126     return (inited > 0) ? (0) : (-1);
00127 }
00128 
00129 int EthernetInterface::disconnect() {
00130     if (use_dhcp) {
00131         dhcp_release(&netif);
00132         dhcp_stop(&netif);
00133     } else {
00134         netif_set_down(&netif);
00135     }
00136     
00137     eth_arch_disable_interrupts();
00138     
00139     return 0;
00140 }
00141 
00142 char* EthernetInterface::getMACAddress() {
00143     return mac_addr;
00144 }
00145 
00146 char* EthernetInterface::getIPAddress() {
00147     return ip_addr;
00148 }
00149 
00150 char* EthernetInterface::getGateway() {
00151     return gateway;
00152 }
00153 
00154 char* EthernetInterface::getNetworkMask() {
00155     return networkmask;
00156 }
00157 
00158 int EthernetInterface::setName(const char * myname) {
00159     strncpy(myName, myname, 32);
00160     myName[32] = '\0';  // be sure it is NULL terminated.
00161     // make the name 'safe'
00162     for (int i=0; i<32 && myName[i]; i++) {
00163         if (!(myName[i] >= '0' && myName[i] <= '9')
00164         &&  !(myName[i] >= 'A' && myName[i] <= 'Z')
00165         &&  !(myName[i] >= 'a' && myName[i] <= 'z'))
00166             myName[i] = '-';
00167     }
00168     netif_set_hostname(&netif, myName);
00169     return 0;
00170 }
00171 
00172 char* EthernetInterface::getName() {
00173     return netif_get_hostname(&netif);
00174 
00175 }