Greg Steiert
This is a working HTTP server with I2C, GPIO and PWM commands accessible through URLs. It also includes the ability to serve files from an SD card.
Dependencies: EthernetInterfaceMuri SDFileSystem mbed-rtos mbed
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main.cpp
00001 #include "mbed.h" 00002 #include "EthernetInterface.h" 00003 #include "SDFileSystem.h" 00004 #include "muri.h" 00005 #include <stdio.h> 00006 #include <string.h> 00007 00008 #define HTTPD_SERVER_PORT 80 00009 #define HTTPD_MAX_REQ_LENGTH 1023 00010 #define HTTPD_MAX_HDR_LENGTH 255 00011 #define HTTPD_MAX_FNAME_LENGTH 127 00012 #define MURI_MAX_RESP_LENGTH 127 00013 #define I2C_BUFFER_SIZE 31 00014 00015 SDFileSystem sd(p5, p6, p7, p8, "sd"); // 00016 // I2C i2c(p28, p27); 00017 EthernetInterface eth; 00018 TCPSocketServer server; 00019 TCPSocketConnection client; 00020 00021 char buffer[HTTPD_MAX_REQ_LENGTH+1]; 00022 char httpHeader[HTTPD_MAX_HDR_LENGTH+1]; 00023 char filename[HTTPD_MAX_FNAME_LENGTH+1]; 00024 char obuf[MURI_MAX_RESP_LENGTH+1]; 00025 char data[I2C_BUFFER_SIZE]; 00026 char *uristr; 00027 char *eou; 00028 char *qrystr; 00029 00030 FILE *fp; 00031 int rdCnt; 00032 00033 void get_file(char* uri) 00034 { 00035 printf("get_file %s\n", uri); 00036 char *lstchr = strrchr(uri, NULL) -1; 00037 if ('/' == *lstchr) { 00038 printf("Open directory /sd%s\n", uri); 00039 *lstchr = 0; 00040 sprintf(filename, "/sd%s", uri); 00041 DIR *d = opendir(filename); 00042 if (d != NULL) { 00043 sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n"); 00044 client.send(httpHeader,strlen(httpHeader)); 00045 sprintf(httpHeader,"<html><head><title>Directory Listing</title></head><body><h1>%s</h1><ul>", uri); 00046 client.send(httpHeader,strlen(httpHeader)); 00047 struct dirent *p; 00048 while((p = readdir(d)) != NULL) { 00049 printf("%s\n", p->d_name); 00050 sprintf(httpHeader,"<li>%s</li>", p->d_name); 00051 client.send(httpHeader,strlen(httpHeader)); 00052 } 00053 } 00054 closedir(d); 00055 printf("Directory closed\n"); 00056 sprintf(httpHeader,"</ul></body></html>"); 00057 client.send(httpHeader,strlen(httpHeader)); 00058 } else { 00059 sprintf(filename, "/sd%s", uri); 00060 fp = fopen(filename, "r"); 00061 if (fp == NULL) { 00062 sprintf(httpHeader,"HTTP/1.1 404 Not Found \r\nContent-Type: text\r\nConnection: Close\r\n\r\n"); 00063 client.send(httpHeader,strlen(httpHeader)); 00064 client.send(uri,strlen(uri)); 00065 } else { 00066 sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n"); 00067 client.send(httpHeader,strlen(httpHeader)); 00068 while ((rdCnt = fread(buffer, sizeof( char ), 1024, fp)) == 1024) { 00069 client.send(buffer, rdCnt); 00070 } 00071 client.send(buffer, rdCnt); 00072 fclose(fp); 00073 } 00074 } 00075 } 00076 00077 void get_cgi(char* uri) 00078 { 00079 char *result; 00080 muri(uri, data, obuf); 00081 if (!strncmp(obuf, "200 ", 4)) { 00082 result = obuf +4; 00083 sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n"); 00084 client.send(httpHeader,strlen(httpHeader)); 00085 client.send(result,strlen(result)); 00086 printf("result: %s", result); 00087 } else { 00088 sprintf(httpHeader,"HTTP/1.1 "); 00089 client.send(httpHeader,strlen(httpHeader)); 00090 client.send(obuf,strlen(obuf)); 00091 sprintf(httpHeader,"\r\n"); 00092 client.send(httpHeader,strlen(httpHeader)); 00093 } 00094 00095 } 00096 00097 00098 int main (void) 00099 { 00100 // EthernetInterface eth; 00101 eth.init(); //Use DHCP 00102 eth.connect(); 00103 printf("IP Address is %s\n", eth.getIPAddress()); 00104 00105 // TCPSocketServer server; 00106 server.bind(HTTPD_SERVER_PORT); 00107 server.listen(); 00108 00109 init_dio(); //initialize pmd digital IO 00110 00111 while (true) { 00112 printf("\nWait for new connection...\r\n"); 00113 server.accept(client); 00114 client.set_blocking(false, 1500); // Timeout after (1.5)s 00115 00116 printf("Connection from: %s\r\n", client.get_address()); 00117 while (true) { 00118 int n = client.receive(buffer, sizeof(buffer)); 00119 if (n <= 0) break; 00120 printf("Recieved Data: %d\r\n\r\n%.*s\r\n",n,n,buffer); 00121 if (n >= 1024) { 00122 sprintf(httpHeader,"HTTP/1.1 413 Request Entity Too Large \r\nContent-Type: text\r\nConnection: Close\r\n\r\n"); 00123 client.send(httpHeader,strlen(httpHeader)); 00124 client.send(buffer,n); 00125 break; 00126 } else { 00127 buffer[n]=0; 00128 } 00129 if (!strncmp(buffer, "GET ", 4)) { 00130 uristr = buffer + 4; 00131 eou = strstr(uristr, " "); 00132 if (eou == NULL) { 00133 sprintf(httpHeader,"HTTP/1.1 400 Bad Request \r\nContent-Type: text\r\nConnection: Close\r\n\r\n"); 00134 client.send(httpHeader,strlen(httpHeader)); 00135 client.send(buffer,n); 00136 } else { 00137 *eou = 0; 00138 if (!strncmp(uristr, "/muri/", 6)) { 00139 get_cgi(uristr+6); 00140 } else { 00141 get_file(uristr); 00142 } 00143 } 00144 } 00145 } 00146 00147 client.close(); 00148 } 00149 }
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