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
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[] = { 0x30, 0x82, 0x04, 0xD3, 0x30, 0x82, 0x03, 0xBB, 0xA0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x10, 0x18, 0xDA, 0xD1, 0x9E, 0x26, 0x7D, 0xE8, 0xBB, 0x4A, 0x21, 0x58, 0xCD, 0xCC, 0x6B, 0x3B, 0x4A, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x05, 0x05, 0x00, 0x30, 0x81, 0xCA, 0x31, 0x0B, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13, 0x02, 0x55, 0x53, 0x31, 0x17, 0x30, 0x15, 0x06, 0x03, 0x55, 0x04, 0x0A, 0x13, 0x0E, 0x56, 0x65, 0x72, 0x69, 0x53, 0x69, 0x67, 0x6E, 0x2C, 0x20, 0x49, 0x6E, 0x63, 0x2E, 0x31, 0x1F, 0x30, 0x1D, 0x06, 0x03, 0x55, 0x04, 0x0B, 0x13, 0x16, 0x56, 0x65, 0x72, 0x69, 0x53, 0x69, 0x67, 0x6E, 0x20, 0x54, 0x72, 0x75, 0x73, 0x74, 0x20, 0x4E, 0x65, 0x74, 0x77, 0x6F, 0x72, 0x6B, 0x31, 0x3A, 0x30, 0x38, 0x06, 0x03, 0x55, 0x04, 0x0B, 0x13, 0x31, 0x28, 0x63, 0x29, 0x20, 0x32, 0x30, 0x30, 0x36, 0x20, 0x56, 0x65, 0x72, 0x69, 0x53, 0x69, 0x67, 0x6E, 0x2C, 0x20, 0x49, 0x6E, 0x63, 0x2E, 0x20, 0x2D, 0x20, 0x46, 0x6F, 0x72, 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0x10, 0xB5, 0x95, 0xFC, 0xE7, 0x42, 0x05, 0x32, 0xDB, 0xCE, 0x9D, 0x51, 0x5E, 0x28, 0xB6, 0x9E, 0x85, 0xD3, 0x5B, 0xEF, 0xA5, 0x7D, 0x45, 0x40, 0x72, 0x8E, 0xB7, 0x0E, 0x6B, 0x0E, 0x06, 0xFB, 0x33, 0x35, 0x48, 0x71, 0xB8, 0x9D, 0x27, 0x8B, 0xC4, 0x65, 0x5F, 0x0D, 0x86, 0x76, 0x9C, 0x44, 0x7A, 0xF6, 0x95, 0x5C, 0xF6, 0x5D, 0x32, 0x08, 0x33, 0xA4, 0x54, 0xB6, 0x18, 0x3F, 0x68, 0x5C, 0xF2, 0x42, 0x4A, 0x85, 0x38, 0x54, 0x83, 0x5F, 0xD1, 0xE8, 0x2C, 0xF2, 0xAC, 0x11, 0xD6, 0xA8, 0xED, 0x63, 0x6A }; static const uint32_t root_cert_len = sizeof(root_cert);
Revision 0:0687eb79c581, committed 2013-09-16
- Comitter:
- feb11
- Date:
- Mon Sep 16 09:01:32 2013 +0000
- Child:
- 1:db560c045c62
- Commit message:
- initial import
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EthernetInterface.lib Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/feb11/code/EthernetInterface7/#ff6ee7b9fd0c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPHeader.cpp Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,31 @@ +#include "HTTPHeader.h" + +HTTPHeader::HTTPHeader(HTTPStatus status): + _status(status), + _bodyLength(0) +{ +} + +std::string HTTPHeader::getRequest(const std::string &path, const std::string &host, const int port) +{ + + std::string request = "GET "; + request += path; + request += " HTTP/1.0\r\nHost: "; + request += host; + request += ":"; + request += port; + request += "\r\n\r\n"; + return request; +} + +HTTPStatus HTTPHeader::getStatus() const +{ + return _status; +} + +int HTTPHeader::getBodyLength() const +{ + return _bodyLength; +} +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPHeader.h Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,28 @@ +#ifndef HTTP_HEADER_H +#define HTTP_HEADER_H + +#include <string> +#include "HTTPStatus.h" + +class HTTPSClient; + +class HTTPHeader +{ +public : + + friend class HTTPSClient; + + HTTPHeader(HTTPStatus status = HTTP_INVALID); + + static std::string getRequest(const std::string &path, const std::string &host, const int port); + + HTTPStatus getStatus() const; + int getBodyLength() const; +private : + + HTTPStatus _status; + int _bodyLength; +}; + +#endif +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPSClient.cpp Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,88 @@ +#include "HTTPSClient.h" +#include "HTTPHeader.h" +#include <stdio.h> +#include <string.h> + +HTTPSClient::HTTPSClient(): + _con() +{ +} + +bool HTTPSClient::connect(const std::string& host) +{ + if(_con.is_connected()) + return false; + + return _con.connect(host.c_str()); +} + +std::string HTTPSClient::readLine() +{ + std::string line; + char c; + _con.receive(&c, 1); + while(c != '\r') { + line += c; + _con.receive(&c, 1); + } + _con.receive(&c, 1); // skip \n + return line; +} + +HTTPHeader HTTPSClient::readHeader() +{ + HTTPHeader hdr; + std::string line = readLine(); + sscanf(line.c_str(), "HTTP/1.%*d %d OK", &hdr._status); + do { + if(!line.compare(0,strlen("Content-Length"), "Content-Length")) + sscanf(line.c_str(), "Content-Length: %d", &hdr._bodyLength); + else if(!line.compare(0,strlen("content-length"), "content-length")) + sscanf(line.c_str(), "content-length: %d", &hdr._bodyLength); + line = readLine(); + } while(line.size()); + return hdr; +} + +int HTTPSClient::get(const std::string& path, HTTPHeader *hdr) +{ + if(!_con.is_connected()) + return -1; + + const std::string &request = HTTPHeader::getRequest(path, _con.get_address(), 443); + + if(_con.send_all((char*)request.c_str(), request.size()+1) != request.size()+1) + return -1; + + *hdr = readHeader(); + return hdr->_status == HTTP_OK ? 0 : -1; +} + +int HTTPSClient::get(const std::string& path, HTTPHeader *hdr, char *data, int length) +{ + if(!_con.is_connected()) + return -1; + + if(hdr != NULL) { + const std::string &request = HTTPHeader::getRequest(path, _con.get_address(), 443); + if(_con.send_all((char*)request.c_str(), request.size()+1) != request.size()+1) + return -1; + *hdr = readHeader(); + if(hdr->_status != HTTP_OK) + return -1; + + if(hdr->_bodyLength > 0) + return _con.receive(data, hdr->_bodyLength > length ? length : hdr->_bodyLength); + + return 0; + } else + return _con.receive(data, length); +} + +bool HTTPSClient::disconnect() +{ + if(!_con.is_connected()) + return true; + + return _con.close() == 0; +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPSClient.h Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,87 @@ +#ifndef HTTPS_CLIENT_H +#define HTTPS_CLIENT_H + +#include <string> +#include "TLSConnection.h" +#include "HTTPHeader.h" + + +/** Simple wrapper of TLS library to send GET request to + a server and receive some web pages. +*/ +class HTTPSClient +{ +public : + + HTTPSClient(); + + /** Connnect to the given host. + + \param host A valid hostname (e.g. "mbed.org") + \return True if the connection was established with + success, false otherwise. + + \note If the client is already connected, it returns false. + */ + bool connect(const std::string& host); + + /** Send a GET request to the host. + + \param path + \param hdr A pointer to an HTTPHeader object. + \return Returns 0 if the request was sent with success, + or -1 if an error occured. + */ + int get(const std::string& path, HTTPHeader *hdr); + + /** Send a get request and reads (partially) the body + + \param path + \param hdr A pointer to an HTTPHeader object. + \param data A pointer to some buffer + \param length Maximum number of bytes to read + \return Number of bytes stored in data in range 0..length, or -1 + if an error occured. + + \note To check whether this request is sent with success, you must check + the status of the HTTPHeader and the value of the integer returned by this + function. + + Example: + @code + // Assuming that an HTTPSClient object c is connected to a host + HTTPHeader hdr; + char buffer[256]; + int n = c.get("/", &hdr, buffer, 256); + if(n > 0 && hdr.getStatus() == HTTP_OK) // GET request sent with success + { + // do some stuff here.. + } + else + printf("Failed to send get request\n"); + @endcode + + + \note If hdr is null, this function does not send anything and directly writes + bytes in data. This is particularly useful if you expect large answers (such as + webpages) from the host. + */ + int get(const std::string& path, HTTPHeader *hdr, char *data, int length); + + /** Disconnect from host + + \return True if the client disconnected with success, false otherwise. + */ + bool disconnect(); + +private : + + std::string readLine(); + HTTPHeader readHeader(); + + TLSConnection _con; + +}; + +#endif +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPStatus.h Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,17 @@ +#ifndef HTTP_STATUS_H +#define HTTP_STATUS_H + + +enum HTTPStatus { + HTTP_OK = 200, + HTTP_BAD_REQUEST = 400, + HTTP_UNAUTHORIZED, + HTTP_FORBIDDEN = 403, + HTTP_NOT_FOUND, + HTTP_INTERNAL_ERROR = 500, + HTTP_INVALID = 0 +}; + + +#endif +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TLS_cyassl.lib Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/feb11/code/TLS_cyassl/#9494492e9bf7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,86 @@ +/* + This examples shows how to use the HTTPS library + in order to download a webpage from twitter.com + + Don't forget to download certificates and copy on + your mbed before running this program. You can + download them from this link: + http://mbed.org/media/uploads/feb11/certificates-twitter.zip +*/ + +#include "mbed.h" +#include "EthernetInterface.h" +#include "HTTPSClient.h" + +const char host[] = "twitter.com"; +const char request[] = "https://twitter.com"; +LocalFileSystem local("local"); + +int main() +{ + set_time(1378370406); + + /* Starting Ethernet */ + EthernetInterface eth; + if(eth.init() || eth.connect()) + { + printf("Error with EthernetInterface\n\r"); + return -1; + } + + /* Now, let's connect to twitter.com */ + HTTPSClient client; + if(!client.connect(host)) + { + printf("Failed to connect to %s\n", host); + return -1; + } + printf("Connected to %s !\n", host); + + /* Let's send our GET request to get the webpage */ + char buffer[256]; + int bufferLength = sizeof(buffer); + HTTPHeader header; + int read = client.get(request, &header, buffer, bufferLength); + if(header.getStatus() != HTTP_OK || read < 0) + { + printf("Failed sending GET request : %s to %s", request, host); + return -1; + } + + /* index.htm is used to store the webpage */ + FILE *fp = fopen("/local/index.htm", "w"); + if(fp == NULL) + { + printf("Failed to open file index.htm\n"); + return -1; + } + fwrite(buffer, 1, read, fp); // writing the first part of the body + + int totalRead = read; + while(totalRead < header.getBodyLength()) + { + if(bufferLength > header.getBodyLength() - totalRead) + bufferLength = header.getBodyLength() - totalRead; + + /* This function does not send a get request but instead + just receive data from the host. + */ + read = client.get("", NULL, buffer, bufferLength); + if(read < 0) + { + printf("Error while getting data from %s\n", host); + return -1; + } + fwrite(buffer, 1, read, fp); + totalRead += read; + } + + /* We're done, let's close everything */ + fclose(fp); + printf("Disconnecting from %s\n", host); + client.disconnect(); + eth.disconnect(); + + return 0; +} \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-rtos/#ee87e782d34f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Sep 16 09:01:32 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/9c8f0e3462fb \ No newline at end of file