2019-10-30 Add esp32-idf 3.1 dns server return html

2019-10-30  Add esp32-idf 3.1 dns server return html

12_dns_server/.gitignore

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+build/*

12_dns_server/Makefile

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+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := dns_server
+
+COMPONENT_ADD_INCLUDEDIRS := components/include
+
+include $(IDF_PATH)/make/project.mk

12_dns_server/README.md

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+# ESP32 dns_server
+
+说明：将 ESP32 当做一个 dns_server and web_server，通過在客戶端登陸網頁域名：www.espressif.com 登陸網頁，獲得特定返回。
+## Quick start
+
+### 必須
+
+- 你已经安装好 ESP-IDF 和工具链。
+- 你已经有一个手機或者電腦客戶端。
+- 將 ESP32 設置為 softAP 模式。
+
+### 步骤
+
+- 使用数据线将开发板连接到你的系统中，让系统能够识别到你的板子（Windows 是`COM\*`, Linux 是`/dev/ttyUSB\*`）。
+- 进入`sta`所在目录。
+- 执行命名`make menuconfig`进行配置。
+  - 对热点的 SSID 和密码进行配置。依次进入配置选项`Demo Configuration  --->`，然后在`WiFi SSID`和`WiFi Password`中填写你的 SSID 和密码。然后退出配置菜单，保存配置。
+  - 对串口进行配置。
+- 执行命令`make`进行编译
+- 执行命令`make flash monitor`将编译生成的镜像烧写到 ESP32 开发板上面，并查看串口输出。
+- 在客戶端打開瀏覽器，輸入 www.espressif.com ，獲得網頁返回。
+
+### 现象
+
+![](http://i.imgur.com/ED5kuKJ.jpg)
+

12_dns_server/components/component.mk

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+#
+# Component Makefile
+#
+
+COMPONENT_ADD_INCLUDEDIRS := include
+
+COMPONENT_SRCDIRS := src

12_dns_server/components/include/dns_server.h

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+#ifndef __DNA_SERVER_H__
+#define __DNA_SERVER_H__
+
+#define SIZEOF_DNSANS_HDR    12
+#define SIZEOF_DNSANS_HDRQUE 20
+
+#define DNS_SERVER_ID        0x0000
+#define DNS_SERVER_FLAGS     0x8180
+#define DNS_SERVER_NUMQUE    0x0001
+#define DNS_SERVER_ANSRRS    0x0001
+#define DNS_SERVER_AUTRRS    0x0000
+#define DNS_SERVER_ADDRRS    0x0000
+#define TABLENAME "www.xuhong.com"
+#define DNS_SERVER_TYPE      0x0001
+#define DNS_SERVER_CLASS     0x0001
+#define DNS_POINAME          0xC00C
+#define DNS_SERVER_ANSTYPE   0x0001
+#define DNS_SERVER_ANSTYPEE  0x0001
+#define DNS_SERVER_DATALEN   0x0000
+#define DNS_SERVER_ANSTIME   0x003c0004
+#define DNS_SERVER_ADRESS    0xc0a80401
+void dns_server_send(void);
+void get_dns_request(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port);
+void my_udp_init(void);
+
+#endif

12_dns_server/components/include/web_server.h

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+#ifndef __WEB_SERVER_H__
+#define __WEB_SERVER_H__
+
+
+void web_server2(void *pvParameters);
+
+#endif

12_dns_server/components/src/dns_server.c

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+/*
+ * @Author: your name
+ * @Date: 2019-10-30 10:22:47
+ * @LastEditTime: 2019-10-30 10:56:13
+ * @LastEditors: Please set LastEditors
+ * @Description: In User Settings Edit
+ * @FilePath: \esp-idf\mine\ESP32_DNS_Server\components\src\dns_server.c
+ */
+#include <string.h>
+#include <sys/socket.h>
+#include "esp_system.h"
+#include "esp_log.h"
+#include "tcpip_adapter.h"
+#include "lwip/opt.h"
+#include "lwip/err.h"
+#include "lwip/pbuf.h"
+#include "lwip/netif.h"
+#include "lwip/ip_addr.h"
+#include "lwip/ip.h"
+#include "lwip/udp.h"
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/ip4_addr.h"
+#include "lwip/ip6_addr.h"
+#include "lwip/api.h"
+#include "dns_server.h"
+
+#define TAG "lwip_udp"
+
+uint16_t txid = 0;
+uint16_t nquestions = 0;
+uint16_t nanswers = 0;
+struct udp_pcb *upcb1;
+const ip_addr_t *addr1;
+u16_t port1;
+
+struct dns_ans_hdr
+{
+    PACK_STRUCT_FIELD(uint16_t id);
+    PACK_STRUCT_FIELD(uint16_t flag);
+    PACK_STRUCT_FIELD(uint16_t numquestions);
+    PACK_STRUCT_FIELD(uint16_t numanswers);
+    PACK_STRUCT_FIELD(uint16_t numauthrr);
+    PACK_STRUCT_FIELD(uint16_t numextrarr);
+} PACK_STRUCT_STRUCT;
+
+struct dns_ans_ans
+{
+    uint16_t typ;
+    uint16_t cls;
+    uint16_t point;
+    uint16_t antyp;
+    uint16_t antypp;
+    uint16_t len;
+    uint32_t time;
+    uint32_t addr;
+};
+
+struct dns_table_entry
+{
+    uint16_t txid;
+    uint16_t flags;
+    uint16_t numque;
+    uint16_t ansrrs;
+    uint16_t autrrs;
+    uint16_t addrrs;
+    char name[256];
+    uint16_t type;
+    uint16_t class;
+    uint16_t poiname;
+    uint16_t anstype;
+    uint16_t anstypee;
+    uint16_t datalen;
+    uint32_t anstime;
+    uint32_t adress;
+};
+
+void dns_server_send(void)
+{
+    struct pbuf *rp = NULL;
+    struct dns_ans_hdr hdr;
+    struct dns_ans_ans qry;
+    uint8_t n;
+    uint16_t query_idx, copy_len;
+    const char *hostname, *hostname_part;
+    struct dns_table_entry dns_server_table = {
+        .txid = DNS_SERVER_ID,
+        .flags = DNS_SERVER_FLAGS,
+        .numque = DNS_SERVER_NUMQUE,
+        .ansrrs = DNS_SERVER_ANSRRS,
+        .autrrs = DNS_SERVER_AUTRRS,
+        .addrrs = DNS_SERVER_ADDRRS,
+        .name = {0},
+        .type = DNS_SERVER_TYPE,
+        .class = DNS_SERVER_CLASS,
+        .poiname = DNS_POINAME,
+        .anstype = DNS_SERVER_ANSTYPE,
+        .anstypee = DNS_SERVER_ANSTYPEE,
+        .datalen = DNS_SERVER_DATALEN,
+        .anstime = DNS_SERVER_ANSTIME,
+        .adress = DNS_SERVER_ADRESS};
+    strcpy(dns_server_table.name, TABLENAME);
+    struct dns_table_entry *entry = &dns_server_table;
+
+    rp = pbuf_alloc(PBUF_TRANSPORT, 51, PBUF_RAM);
+    if (rp != NULL)
+    {
+        memset(&hdr, 0, SIZEOF_DNSANS_HDR);
+        /* fill dns_ans header */
+        hdr.id = htons(txid);
+        hdr.flag = htons(entry->flags);
+        hdr.numquestions = htons(entry->numque);
+        hdr.numanswers = htons(entry->ansrrs);
+        hdr.numauthrr = htons(entry->autrrs);
+        hdr.numextrarr = htons(entry->addrrs);
+        pbuf_take(rp, &hdr, SIZEOF_DNSANS_HDR);
+        /* convert hostname into suitable query format. */
+        hostname = entry->name;
+        --hostname;
+        query_idx = SIZEOF_DNSANS_HDR;
+        do
+        {
+            ++hostname;
+            hostname_part = hostname;
+            for (n = 0; *hostname != '.' && *hostname != 0; ++hostname)
+            {
+                ++n;
+            }
+            copy_len = (u16_t)(hostname - hostname_part);
+            pbuf_put_at(rp, query_idx, n);
+            pbuf_take_at(rp, hostname_part, copy_len, query_idx + 1);
+            query_idx += n + 1;
+        } while (*hostname != 0);
+        pbuf_put_at(rp, query_idx, 0);
+        query_idx++;
+        /* fill dns ans */
+        qry.typ = htons(entry->type);
+        qry.cls = htons(entry->class);
+        qry.point = htons(entry->poiname);
+        qry.antyp = htons(entry->anstype);
+        qry.antypp = htons(entry->anstypee);
+        qry.len = htons(entry->datalen);
+        qry.time = htonl(entry->anstime);
+        qry.addr = htonl(entry->adress);
+        printf("the query_idx is %d\n", query_idx);
+        printf("the qry.addr is %02X\n", qry.addr);
+        pbuf_take_at(rp, &qry, SIZEOF_DNSANS_HDRQUE, query_idx);
+
+        udp_sendto(upcb1, rp, addr1, port1);
+        //      pbuf_free(rp);
+    }
+}
+
+void get_dns_request(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
+{
+    printf("get the massage from sat\n");
+    struct dns_ans_hdr hdr;
+    upcb1 = upcb;
+    addr1 = addr;
+    port1 = port;
+    if (p->tot_len < (SIZEOF_DNSANS_HDR + SIZEOF_DNSANS_HDRQUE))
+    {
+        LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n"));
+        printf("dns_recv: pbuf too small\n");
+        /* free pbuf and return */
+    }
+    else
+    {
+        pbuf_copy_partial(p, &hdr, SIZEOF_DNSANS_HDR, 0);
+        txid = ntohs(hdr.id);
+        nquestions = ntohs(hdr.numquestions);
+    }
+    printf("the length of q: %d\n", p->tot_len);
+    printf("the txid is: %02X and the questions number is %02X\n", txid, nquestions);
+    pbuf_free(p); //check this
+    dns_server_send();
+}
+
+void my_udp_init(void)
+{
+    struct udp_pcb *upcb;
+    err_t err;
+
+    upcb = udp_new();
+    err = udp_bind(upcb, IP_ADDR_ANY, 53);
+    if (err == ERR_OK)
+    {
+        udp_recv(upcb, get_dns_request, NULL);
+    }
+    else
+    {
+        udp_remove(upcb);
+    }
+}

12_dns_server/components/src/web_server.c

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+
+/* Brief: This demo shows how to use esp32 as a webserver
+ * 
+ * - use a sta connect to this ap
+ * - open the browser and input the ip_address of this esp32(the default ip_adress is: 192.168.4.1 )
+ * - and you can see "hello,this is esp32" on this web page
+ *
+ */
+#include "freertos/FreeRTOS.h"
+#include "esp_wifi.h"
+#include "esp_system.h"
+#include "esp_event.h"
+#include "esp_event_loop.h"
+#include "nvs_flash.h"
+#include "driver/gpio.h"
+#include "freertos/portmacro.h"
+#include "freertos/event_groups.h"
+#include "esp_log.h"
+#include "tcpip_adapter.h"
+#include "lwip/err.h"
+#include "string.h"
+#include "lwip/sys.h"
+#include "lwip/netdb.h"
+#include "lwip/api.h"
+#include "web_server.h"
+
+#define TAG  "lwip_udp"
+
+const static char http_html_hdr[] =
+    "HTTP/1.1 200 OK\r\nContent-type: text/html\r\n\r\n";
+const static char http_index_hml[] = "<!DOCTYPE html>"
+      "<html>\n"
+      "<head>\n"
+      "  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n"
+      "  <style type=\"text/css\">\n"
+      "    html, body, iframe { margin: 0; padding: 0; height: 100%; }\n"
+      "    iframe { display: block; width: 100%; border: none; }\n"
+      "  </style>\n"
+      "<title>HELLO ESP32</title>\n"
+      "</head>\n"
+      "<body>\n"
+      "<h1>Hello World, from ESP32!</h1>\n"
+      "</body>\n"
+      "</html>\n";
+
+static void web_http_server(struct netconn *conn)
+{
+  struct netbuf *inputbuf;
+  char *buf;
+  u16_t buflen;
+  err_t err;
+
+  err = netconn_recv(conn, &inputbuf);
+  if (err == ERR_OK) {
+    netbuf_data(inputbuf, (void**)&buf, &buflen);
+    printf("the received data:\n%s\n",buf);
+    /* Judge if this is an HTTP GET command */
+    if (buflen >= 5 && buf[0] == 'G' && buf[1] == 'E' && buf[2] == 'T' && buf[3] == ' ' && buf[4] == '/' ) {
+      netconn_write(conn, http_html_hdr, sizeof(http_html_hdr)-1, NETCONN_NOCOPY);
+
+      if(buf[5]=='h') {
+        netconn_write(conn, http_index_hml, sizeof(http_index_hml)-1, NETCONN_NOCOPY);
+      }
+      else if(buf[5]=='l') {
+        netconn_write(conn, http_index_hml, sizeof(http_index_hml)-1, NETCONN_NOCOPY);
+      }
+//      else if(buf[5]=='j') {
+//    	  netconn_write(conn, json_unformatted, strlen(json_unformatted), NETCONN_NOCOPY);
+//      }
+      else {
+          netconn_write(conn, http_index_hml, sizeof(http_index_hml)-1, NETCONN_NOCOPY);
+      }
+    }
+  }
+  netconn_close(conn);
+  netbuf_delete(inputbuf);
+}
+
+
+void web_server2(void *pvParameters)
+{
+  struct netconn *conn, *newconn;
+  err_t err;
+  conn = netconn_new(NETCONN_TCP);
+  netconn_bind(conn, NULL, 80);
+  netconn_listen(conn);
+  while (1) {
+    err = netconn_accept(conn, &newconn);
+    if (err == ERR_OK) {
+      web_http_server(newconn);
+      netconn_delete(newconn);
+    }
+    else {
+      netconn_close(conn);
+      netconn_delete(conn);
+      break;
+    }
+  }
+}

12_dns_server/main/Kconfig.projbuild

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+menu "Demo Configuration"
+
+config WIFI_SSID
+    string "WiFi SSID"
+	default "tidyjiang-ssid"
+	help
+		SSID (network name) to connect to.
+
+config WIFI_PASSWORD
+    string "WiFi Password"
+	default "tidyjiang-passwd"
+	help
+		WiFi password (WPA or WPA2) to use.
+
+		Can be left blank if the network has no security set.
+
+endmenu