通过Uip WebClient 实现中应用DNS解析

#include "stm32f10x.h" #include "stdio.h" #include "string.h" #include "uip.h" #include "uip_arp.h" #include "tapdev.h" #include "timer.h" #include "ENC28J60.h" #include "SPI.h" #define PRINTF_ON 1 #define BUF ((struct uip_eth_hdr *)&uip_buf[0]) #ifndef NULL #define NULL (void *)0 #endif /* NULL */ static unsigned char mymac[6] = {0x04,0x02,0x35,0x00,0x00,0x01}; void RCC_Configuration(void); void GPIO_Configuration(void); void USART_Configuration(void); int main(void) { int i; uip_ipaddr_t ipaddr; struct timer periodic_timer, arp_timer; RCC_Configuration(); GPIO_Configuration(); USART_Configuration(); SPInet_Init(); timer_set(&periodic_timer, CLOCK_SECOND / 2); timer_set(&arp_timer, CLOCK_SECOND * 10); SysTick_Config(72000); //以太网控制器驱动初始化 tapdev_init(mymac); //Uip 协议栈初始化 uip_init(); 

 uip_ipaddr(ipaddr, 192, 168, 1, 15); //配置Ip uip_sethostaddr(ipaddr); uip_ipaddr(ipaddr, 192, 168, 1, 1); //配置网关 uip_setdraddr(ipaddr); uip_ipaddr(ipaddr, 255, 255, 255, 0); //配置子网掩码 uip_setnetmask(ipaddr); webclient_init(); resolv_init(); uip_ipaddr(ipaddr, 8,8,8,8); //DNS server ,Google DNS Server resolv_conf(ipaddr); resolv_query("www.ichanging.org"); while(1){ uip_len = tapdev_read(); //从网卡读取数据 if(uip_len > 0) { //如果数据存在则按协议处理 if(BUF->type == htons(UIP_ETHTYPE_IP)) { //如果收到的是IP数据，调用uip_input()处理 uip_arp_ipin(); uip_input(); /* If the above function invocation resulted in data that should be sent out on the network, the global variable uip_len is set to a value > 0. */ if(uip_len > 0) { uip_arp_out(); tapdev_send(); } }else if(BUF->type == htons(UIP_ETHTYPE_ARP)){ //如果收到的是ARP数据，调用uip_arp_arpin处理 uip_arp_arpin(); /* If the above function invocation resulted in data that should be sent out on the network, the global variable uip_len is set to a value > 0. */ if(uip_len > 0) { tapdev_send(); } } }else if(timer_expired(&periodic_timer)){ //查看0.5s是否到了，调用uip_periodic处理TCP超时程序 timer_reset(&periodic_timer); for(i = 0; i < UIP_CONNS; i++) { uip_periodic(i); /* If the above function invocation resulted in data that should be sent out on the network, the global variable uip_len is set to a value > 0. */ if(uip_len > 0) { uip_arp_out(); tapdev_send(); } } for(i = 0; i < UIP_UDP_CONNS; i++) { uip_udp_periodic(i); //处理udp超时程序 /* If the above function invocation resulted in data that should be sent out on the network, the global variable uip_len is set to a value > 0. */ if(uip_len > 0) { uip_arp_out(); tapdev_send(); } } /* Call the ARP timer function every 10 seconds. */ //10s到了就处理ARP if(timer_expired(&arp_timer)) { timer_reset(&arp_timer); uip_arp_timer(); } } } } /*WebClient Set*/ void resolv_found(char *name, u16_t *ipaddr) //DNS 找到对应服务器IP { //u16_t *ipaddr2; if(ipaddr == NULL) { printf("Host '%s' not found.\n", name); } else { printf("Found name '%s' = %d.%d.%d.%d\n", name, htons(ipaddr[0]) >> 8, htons(ipaddr[0]) & 0xff, htons(ipaddr[1]) >> 8, htons(ipaddr[1]) & 0xff); if(webclient_get("www.ichanging.org", 80, "/index.php")) { printf("the connection was initiated"); }else{ printf("the host name could not be found in the cache or TCP connection could not be created."); } } } void webclient_closed(void) { //printf("Webclient: connection closed\n"); } void webclient_aborted(void) { //printf("Webclient: connection aborted\n"); } void webclient_timedout(void) { //printf("Webclient: connection timed out\n"); } void webclient_connected(void) { //printf("Webclient: connected, waiting for data...\n"); } void webclient_datahandler(char *data, u16_t len) { //printf("Webclient: got %d bytes of data.\n", len); } /*Stm32 Set*/ void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOA , &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA , &GPIO_InitStructure); } void RCC_Configuration(void) { /* 定义枚举类型变量 HSEStartUpStatus */ ErrorStatus HSEStartUpStatus; /* 复位系统时钟设置*/ RCC_DeInit(); /* 开启HSE*/ RCC_HSEConfig(RCC_HSE_ON); /* 等待HSE起振并稳定*/ HSEStartUpStatus = RCC_WaitForHSEStartUp(); /* 判断HSE起是否振成功，是则进入if()内部 */ if(HSEStartUpStatus == SUCCESS) { /* 选择HCLK（AHB）时钟源为SYSCLK 1分频 */ RCC_HCLKConfig(RCC_SYSCLK_Div1); /* 选择PCLK2时钟源为 HCLK（AHB） 1分频 */ RCC_PCLK2Config(RCC_HCLK_Div1); /* 选择PCLK1时钟源为 HCLK（AHB） 2分频 */ RCC_PCLK1Config(RCC_HCLK_Div2); /* 设置FLASH延时周期数为2 */ FLASH_SetLatency(FLASH_Latency_2); /* 使能FLASH预取缓存 */ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); /* 选择锁相环（PLL）时钟源为HSE 1分频，倍频数为9，则PLL输出频率为 8MHz * 9 = 72MHz */ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); /* 使能PLL */ RCC_PLLCmd(ENABLE); /* 等待PLL输出稳定 */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); /* 选择SYSCLK时钟源为PLL */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* 等待PLL成为SYSCLK时钟源 */ while(RCC_GetSYSCLKSource() != 0x08); } /* 打开APB2总线上的GPIOA时钟*/ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1, ENABLE); } void USART_Configuration(void) { USART_InitTypeDef USART_InitStructure; USART_ClockInitTypeDef USART_ClockInitStructure; USART_ClockInitStructure.USART_Clock = USART_Clock_Disable; USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low; USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge; USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable; USART_ClockInit(USART1 , &USART_ClockInitStructure); USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx|USART_Mode_Tx; USART_Init(USART1,&USART_InitStructure); USART_Cmd(USART1,ENABLE); } #if PRINTF_ON int fputc(int ch,FILE *f) { USART_SendData(USART1,(u8) ch); while(USART_GetFlagStatus(USART1,USART_FLAG_TC) == RESET); return ch; } #endif