Francois Berder / Mbed 2 deprecated HTTPSClientExample2

This example shows how to use the TLS_cyassl library. It connects to twitter.com and downloads a webpage.

Dependencies:   EthernetInterface7 HTTPSClient_cyassl TLS_cyassl mbed-rtos mbed

Fork of HTTPSClientExample2 by Francois Berder

Once you imported this program, you need to load the right certificate. To do so, open the file cert.h in the TLS_cyassl library then, replace the content by this :

root certificate of twitter

static const uint8_t root_cert[] =
{
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};

static const uint32_t root_cert_len = sizeof(root_cert);

main.cpp@2:659d693a1a21, 2013-09-18 (annotated)

Committer:
feb11
Date:
Wed Sep 18 12:41:31 2013 +0000
Revision:
2:659d693a1a21
Parent:
0:0687eb79c581 
moved HTTPS files to new library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
feb11 0:0687eb79c581 1 /*
feb11 0:0687eb79c581 2 This examples shows how to use the HTTPS library
feb11 0:0687eb79c581 3 in order to download a webpage from twitter.com
feb11 0:0687eb79c581 4
feb11 0:0687eb79c581 5 Don't forget to download certificates and copy on
feb11 0:0687eb79c581 6 your mbed before running this program. You can
feb11 0:0687eb79c581 7 download them from this link:
feb11 0:0687eb79c581 8 http://mbed.org/media/uploads/feb11/certificates-twitter.zip
feb11 0:0687eb79c581 9 */
feb11 0:0687eb79c581 10
feb11 0:0687eb79c581 11 #include "mbed.h"
feb11 0:0687eb79c581 12 #include "EthernetInterface.h"
feb11 0:0687eb79c581 13 #include "HTTPSClient.h"
feb11 0:0687eb79c581 14
feb11 0:0687eb79c581 15 const char host[] = "twitter.com";
feb11 0:0687eb79c581 16 const char request[] = "https://twitter.com";
feb11 0:0687eb79c581 17 LocalFileSystem local("local");
feb11 0:0687eb79c581 18
feb11 0:0687eb79c581 19 int main()
feb11 0:0687eb79c581 20 {
feb11 0:0687eb79c581 21 set_time(1378370406);
feb11 0:0687eb79c581 22
feb11 0:0687eb79c581 23 /* Starting Ethernet */
feb11 0:0687eb79c581 24 EthernetInterface eth;
feb11 0:0687eb79c581 25 if(eth.init() || eth.connect())
feb11 0:0687eb79c581 26 {
feb11 0:0687eb79c581 27 printf("Error with EthernetInterface\n\r");
feb11 0:0687eb79c581 28 return -1;
feb11 0:0687eb79c581 29 }
feb11 0:0687eb79c581 30
feb11 0:0687eb79c581 31 /* Now, let's connect to twitter.com */
feb11 0:0687eb79c581 32 HTTPSClient client;
feb11 0:0687eb79c581 33 if(!client.connect(host))
feb11 0:0687eb79c581 34 {
feb11 0:0687eb79c581 35 printf("Failed to connect to %s\n", host);
feb11 0:0687eb79c581 36 return -1;
feb11 0:0687eb79c581 37 }
feb11 0:0687eb79c581 38 printf("Connected to %s !\n", host);
feb11 0:0687eb79c581 39
feb11 0:0687eb79c581 40 /* Let's send our GET request to get the webpage */
feb11 0:0687eb79c581 41 char buffer[256];
feb11 0:0687eb79c581 42 int bufferLength = sizeof(buffer);
feb11 0:0687eb79c581 43 HTTPHeader header;
feb11 0:0687eb79c581 44 int read = client.get(request, &header, buffer, bufferLength);
feb11 0:0687eb79c581 45 if(header.getStatus() != HTTP_OK || read < 0)
feb11 0:0687eb79c581 46 {
feb11 0:0687eb79c581 47 printf("Failed sending GET request : %s to %s", request, host);
feb11 0:0687eb79c581 48 return -1;
feb11 0:0687eb79c581 49 }
feb11 0:0687eb79c581 50
feb11 0:0687eb79c581 51 /* index.htm is used to store the webpage */
feb11 0:0687eb79c581 52 FILE *fp = fopen("/local/index.htm", "w");
feb11 0:0687eb79c581 53 if(fp == NULL)
feb11 0:0687eb79c581 54 {
feb11 0:0687eb79c581 55 printf("Failed to open file index.htm\n");
feb11 0:0687eb79c581 56 return -1;
feb11 0:0687eb79c581 57 }
feb11 0:0687eb79c581 58 fwrite(buffer, 1, read, fp); // writing the first part of the body
feb11 0:0687eb79c581 59
feb11 0:0687eb79c581 60 int totalRead = read;
feb11 0:0687eb79c581 61 while(totalRead < header.getBodyLength())
feb11 0:0687eb79c581 62 {
feb11 0:0687eb79c581 63 if(bufferLength > header.getBodyLength() - totalRead)
feb11 0:0687eb79c581 64 bufferLength = header.getBodyLength() - totalRead;
feb11 0:0687eb79c581 65
feb11 0:0687eb79c581 66 /* This function does not send a get request but instead
feb11 0:0687eb79c581 67 just receive data from the host.
feb11 0:0687eb79c581 68 */
feb11 0:0687eb79c581 69 read = client.get("", NULL, buffer, bufferLength);
feb11 0:0687eb79c581 70 if(read < 0)
feb11 0:0687eb79c581 71 {
feb11 0:0687eb79c581 72 printf("Error while getting data from %s\n", host);
feb11 0:0687eb79c581 73 return -1;
feb11 0:0687eb79c581 74 }
feb11 0:0687eb79c581 75 fwrite(buffer, 1, read, fp);
feb11 0:0687eb79c581 76 totalRead += read;
feb11 0:0687eb79c581 77 }
feb11 0:0687eb79c581 78
feb11 0:0687eb79c581 79 /* We're done, let's close everything */
feb11 0:0687eb79c581 80 fclose(fp);
feb11 0:0687eb79c581 81 printf("Disconnecting from %s\n", host);
feb11 0:0687eb79c581 82 client.disconnect();
feb11 0:0687eb79c581 83 eth.disconnect();
feb11 0:0687eb79c581 84
feb11 0:0687eb79c581 85 return 0;
feb11 0:0687eb79c581 86 }