kopia lustrzana https://github.com/espressif/esp-idf
Added simple SMTP email client.
This is based on `ssl_mail_client` from mbedtls. The client also adds functionality to send attachments. Signed-off-by: Vikram Dattu <vikram.dattu@espressif.com>pull/2405/merge
Vikram Dattu
rodzic
0b8f17e618
commit
405186c866
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@ -37,10 +37,10 @@ static void openssl_example_task(void *p)
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struct sockaddr_in sock_addr;
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struct hostent *hp;
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struct ip4_addr *ip4_addr;
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int recv_bytes = 0;
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char recv_buf[OPENSSL_EXAMPLE_RECV_BUF_LEN];
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const char send_data[] = OPENSSL_EXAMPLE_REQUEST;
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const int send_bytes = sizeof(send_data);
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@ -134,7 +134,7 @@ static void openssl_example_task(void *p)
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recv_bytes += ret;
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ESP_LOGI(TAG, "%s", recv_buf);
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} while (1);
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ESP_LOGI(TAG, "totally read %d bytes data from %s ......", recv_bytes, OPENSSL_EXAMPLE_TARGET_NAME);
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failed5:
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@ -172,7 +172,6 @@ static void openssl_example_client_init(void)
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void app_main(void)
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{
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ESP_ERROR_CHECK( nvs_flash_init() );
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ESP_ERROR_CHECK(nvs_flash_init());
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ESP_ERROR_CHECK(esp_netif_init());
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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@ -0,0 +1,9 @@
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# The following lines of boilerplate have to be in your project's CMakeLists
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# in this exact order for cmake to work correctly
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cmake_minimum_required(VERSION 3.5)
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# This example uses an extra component for common functions such as Wi-Fi and Ethernet connection.
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set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common)
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include($ENV{IDF_PATH}/tools/cmake/project.cmake)
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project(smtp_client)
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@ -0,0 +1,10 @@
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#
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# This is a project Makefile. It is assumed the directory this Makefile resides in is a
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# project subdirectory.
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#
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PROJECT_NAME := smtp_client
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EXTRA_COMPONENT_DIRS = $(IDF_PATH)/examples/common_components/protocol_examples_common
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include $(IDF_PATH)/make/project.mk
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@ -0,0 +1,78 @@
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# SMTP Client Example
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The Example is SMTP client demo. It sends and email with attachment to recipient.
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## How to use the example
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### Configure the project
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```
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idf.py menuconfig
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```
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* Configure Wi-Fi or Ethernet under "Example Connection Configuration" menu. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../README.md) for more details.
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Please set the following parameters under example config for SMTP client demo to work:
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- Email server, port, sender's email ID, password, recipient's email ID.
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(Replace PORT with the name of the serial port to use.)
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example output
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```
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I (3212) smtp_example: Loading the CA root certificate...
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I (3212) smtp_example: Setting hostname for TLS session...
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I (3222) smtp_example: Setting up the SSL/TLS structure...
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I (3232) smtp_example: Connecting to smtp.googlemail.com:587...
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I (3542) smtp_example: Connected.
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220 smtp.googlemail.com ESMTP r62sm20390571pfc.89 - gsmtp
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I (3952) smtp_example: Writing EHLO to server...
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250-smtp.googlemail.com at your service, [182.75.158.118]
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250-SIZE 35882577
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250-8BITMIME
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250-STARTTLS
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250-ENHANCEDSTATUSCOD
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ES
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250-PIPELINING
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250-CHUNKING
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250 SMTPUTF8
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I (4262) smtp_example: Writing STARTTLS to server...
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220 2.0.0 Ready to start TLS
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I (4562) smtp_example: Performing the SSL/TLS handshake...
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I (5692) smtp_example: Verifying peer X.509 certificate...
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I (5692) smtp_example: Certificate verified.
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I (5692) smtp_example: Cipher suite is TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256
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I (5702) smtp_example: Authentication...
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I (5702) smtp_example: Write AUTH LOGIN
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I (6002) smtp_example: Write USER NAME
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I (6302) smtp_example: Write PASSWORD
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I (6822) smtp_example: Write MAIL FROM
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I (7132) smtp_example: Write RCPT
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I (7432) smtp_example: Write DATA
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I (8252) smtp_example: Write Content
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I (10202) smtp_example: Email sent!
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```
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## Note:
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- You might need to enable permission for less secure apps from email provider. This is because these email providers (e.g. gmail) insist on OAUTH authorization.
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@ -0,0 +1,2 @@
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idf_component_register(SRCS "smtp_client_example_main.c"
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EMBED_TXTFILES server_root_cert.pem esp_logo.png)
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@ -0,0 +1,33 @@
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menu "Example Configuration"
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config SMTP_SERVER
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string "Mail Server"
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default "smtp.googlemail.com"
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help
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Target domain for the example to connect to.
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config SMTP_PORT_NUMBER
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string "Mail port number"
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default "587"
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help
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Mail port number for the example to connect to.
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config SMTP_SENDER_MAIL
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string "Sender email"
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default "sender.email@gmail.com"
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help
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Sender's Email address
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config SMTP_SENDER_PASSWORD
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string "Sender password"
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default "password@123"
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help
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Sender's email password
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config SMTP_RECIPIENT_MAIL
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string "Recipient email"
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default "recipient.email@gmail.com"
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help
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Recipient's email
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endmenu
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@ -0,0 +1,5 @@
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#
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# Main Makefile. This is basically the same as a component makefile.
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#
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COMPONENT_EMBED_TXTFILES := server_root_cert.pem esp_logo.png
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Plik binarny nie jest wyświetlany.
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Po Szerokość: | Wysokość: | Rozmiar: 30 KiB |
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@ -0,0 +1,25 @@
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-----BEGIN CERTIFICATE-----
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MIIESjCCAzKgAwIBAgINAeO0mqGNiqmBJWlQuDANBgkqhkiG9w0BAQsFADBMMSAw
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HgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMjETMBEGA1UEChMKR2xvYmFs
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U2lnbjETMBEGA1UEAxMKR2xvYmFsU2lnbjAeFw0xNzA2MTUwMDAwNDJaFw0yMTEy
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MTUwMDAwNDJaMEIxCzAJBgNVBAYTAlVTMR4wHAYDVQQKExVHb29nbGUgVHJ1c3Qg
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U2VydmljZXMxEzARBgNVBAMTCkdUUyBDQSAxTzEwggEiMA0GCSqGSIb3DQEBAQUA
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A4IBDwAwggEKAoIBAQDQGM9F1IvN05zkQO9+tN1pIRvJzzyOTHW5DzEZhD2ePCnv
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UA0Qk28FgICfKqC9EksC4T2fWBYk/jCfC3R3VZMdS/dN4ZKCEPZRrAzDsiKUDzRr
|
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mBBJ5wudgzndIMYcLe/RGGFl5yODIKgjEv/SJH/UL+dEaltN11BmsK+eQmMF++Ac
|
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xGNhr59qM/9il71I2dN8FGfcddwuaej4bXhp0LcQBbjxMcI7JP0aM3T4I+DsaxmK
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FsbjzaTNC9uzpFlgOIg7rR25xoynUxv8vNmkq7zdPGHXkxWY7oG9j+JkRyBABk7X
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rJfoucBZEqFJJSPk7XA0LKW0Y3z5oz2D0c1tJKwHAgMBAAGjggEzMIIBLzAOBgNV
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HQ8BAf8EBAMCAYYwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMBIGA1Ud
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EwEB/wQIMAYBAf8CAQAwHQYDVR0OBBYEFJjR+G4Q68+b7GCfGJAboOt9Cf0rMB8G
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A1UdIwQYMBaAFJviB1dnHB7AagbeWbSaLd/cGYYuMDUGCCsGAQUFBwEBBCkwJzAl
|
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BggrBgEFBQcwAYYZaHR0cDovL29jc3AucGtpLmdvb2cvZ3NyMjAyBgNVHR8EKzAp
|
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MCegJaAjhiFodHRwOi8vY3JsLnBraS5nb29nL2dzcjIvZ3NyMi5jcmwwPwYDVR0g
|
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BDgwNjA0BgZngQwBAgIwKjAoBggrBgEFBQcCARYcaHR0cHM6Ly9wa2kuZ29vZy9y
|
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ZXBvc2l0b3J5LzANBgkqhkiG9w0BAQsFAAOCAQEAGoA+Nnn78y6pRjd9XlQWNa7H
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TgiZ/r3RNGkmUmYHPQq6Scti9PEajvwRT2iWTHQr02fesqOqBY2ETUwgZQ+lltoN
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FvhsO9tvBCOIazpswWC9aJ9xju4tWDQH8NVU6YZZ/XteDSGU9YzJqPjY8q3MDxrz
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mqepBCf5o8mw/wJ4a2G6xzUr6Fb6T8McDO22PLRL6u3M4Tzs3A2M1j6bykJYi8wW
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IRdAvKLWZu/axBVbzYmqmwkm5zLSDW5nIAJbELCQCZwMH56t2Dvqofxs6BBcCFIZ
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USpxu6x6td0V7SvJCCosirSmIatj/9dSSVDQibet8q/7UK4v4ZUN80atnZz1yg==
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-----END CERTIFICATE-----
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@ -0,0 +1,513 @@
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/**
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* SMTP email client
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*
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* Adapted from the `ssl_mail_client` example in mbedtls.
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*
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* Original Copyright (C) 2006-2016, ARM Limited, All Rights Reserved, Apache 2.0 License.
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* Additions Copyright (C) Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD, Apache 2.0 License.
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*
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_event.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "nvs_flash.h"
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#include "protocol_examples_common.h"
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#include "mbedtls/platform.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/esp_debug.h"
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#include "mbedtls/ssl.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/error.h"
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#include "mbedtls/certs.h"
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#include <mbedtls/base64.h>
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#include <sys/param.h>
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/* Constants that are configurable in menuconfig */
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#define MAIL_SERVER CONFIG_SMTP_SERVER
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#define MAIL_PORT CONFIG_SMTP_PORT_NUMBER
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#define SENDER_MAIL CONFIG_SMTP_SENDER_MAIL
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#define SENDER_PASSWORD CONFIG_SMTP_SENDER_PASSWORD
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#define RECIPIENT_MAIL CONFIG_SMTP_RECIPIENT_MAIL
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#define SERVER_USES_STARTSSL 1
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static const char *TAG = "smtp_example";
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#define TASK_STACK_SIZE (8 * 1024)
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#define BUF_SIZE 512
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#define VALIDATE_MBEDTLS_RETURN(ret, min_valid_ret, max_valid_ret, goto_label) \
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do { \
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if (ret < min_valid_ret || ret > max_valid_ret) { \
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goto goto_label; \
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} \
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} while (0) \
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/**
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* Root cert for smtp.googlemail.com, taken from server_root_cert.pem
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*
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* The PEM file was extracted from the output of this command:
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* openssl s_client -showcerts -connect smtp.googlemail.com:587 -starttls smtp
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*
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* The CA root cert is the last cert given in the chain of certs.
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*
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* To embed it in the app binary, the PEM file is named
|
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* in the component.mk COMPONENT_EMBED_TXTFILES variable.
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*/
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extern const uint8_t server_root_cert_pem_start[] asm("_binary_server_root_cert_pem_start");
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extern const uint8_t server_root_cert_pem_end[] asm("_binary_server_root_cert_pem_end");
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|
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extern const uint8_t esp_logo_png_start[] asm("_binary_esp_logo_png_start");
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extern const uint8_t esp_logo_png_end[] asm("_binary_esp_logo_png_end");
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static int write_and_get_response(mbedtls_net_context *sock_fd, unsigned char *buf, size_t len)
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{
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int ret;
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const size_t DATA_SIZE = 128;
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unsigned char data[DATA_SIZE];
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char code[4];
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size_t i, idx = 0;
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|
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if (len) {
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ESP_LOGD(TAG, "%s", buf);
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}
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|
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if (len && (ret = mbedtls_net_send(sock_fd, buf, len)) <= 0) {
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ESP_LOGE(TAG, "mbedtls_net_send failed with error -0x%x", -ret);
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return ret;
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}
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do {
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len = DATA_SIZE - 1;
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ret = mbedtls_net_recv(sock_fd, data, len);
|
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|
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if (ret <= 0) {
|
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ESP_LOGE(TAG, "mbedtls_net_recv failed with error -0x%x", -ret);
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goto exit;
|
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}
|
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|
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data[len] = '\0';
|
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printf("\n%s", data);
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len = ret;
|
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for (i = 0; i < len; i++) {
|
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if (data[i] != '\n') {
|
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if (idx < 4) {
|
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code[idx++] = data[i];
|
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}
|
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continue;
|
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}
|
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|
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if (idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ') {
|
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code[3] = '\0';
|
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ret = atoi(code);
|
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goto exit;
|
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}
|
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|
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idx = 0;
|
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}
|
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} while (1);
|
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|
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exit:
|
||||
return ret;
|
||||
}
|
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|
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static int write_ssl_and_get_response(mbedtls_ssl_context *ssl, unsigned char *buf, size_t len)
|
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{
|
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int ret;
|
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const size_t DATA_SIZE = 128;
|
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unsigned char data[DATA_SIZE];
|
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char code[4];
|
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size_t i, idx = 0;
|
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|
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if (len) {
|
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ESP_LOGD(TAG, "%s", buf);
|
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}
|
||||
|
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while (len && (ret = mbedtls_ssl_write(ssl, buf, len)) <= 0) {
|
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
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ESP_LOGE(TAG, "mbedtls_ssl_write failed with error -0x%x", -ret);
|
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goto exit;
|
||||
}
|
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}
|
||||
|
||||
do {
|
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len = DATA_SIZE - 1;
|
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ret = mbedtls_ssl_read(ssl, data, len);
|
||||
|
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if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
|
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continue;
|
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}
|
||||
|
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if (ret <= 0) {
|
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ESP_LOGE(TAG, "mbedtls_ssl_read failed with error -0x%x", -ret);
|
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goto exit;
|
||||
}
|
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|
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ESP_LOGD(TAG, "%s", data);
|
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|
||||
len = ret;
|
||||
for (i = 0; i < len; i++) {
|
||||
if (data[i] != '\n') {
|
||||
if (idx < 4) {
|
||||
code[idx++] = data[i];
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
if (idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ') {
|
||||
code[3] = '\0';
|
||||
ret = atoi(code);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
idx = 0;
|
||||
}
|
||||
} while (1);
|
||||
|
||||
exit:
|
||||
return ret;
|
||||
}
|
||||
|
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static int write_ssl_data(mbedtls_ssl_context *ssl, unsigned char *buf, size_t len)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (len) {
|
||||
ESP_LOGD(TAG, "%s", buf);
|
||||
}
|
||||
|
||||
while (len && (ret = mbedtls_ssl_write(ssl, buf, len)) <= 0) {
|
||||
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
||||
ESP_LOGE(TAG, "mbedtls_ssl_write failed with error -0x%x", -ret);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int perform_tls_handshake(mbedtls_ssl_context *ssl)
|
||||
{
|
||||
int ret = -1;
|
||||
uint32_t flags;
|
||||
char *buf = NULL;
|
||||
buf = (char *) calloc(1, BUF_SIZE);
|
||||
if (buf == NULL) {
|
||||
ESP_LOGE(TAG, "calloc failed for size %d", BUF_SIZE);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ESP_LOGI(TAG, "Performing the SSL/TLS handshake...");
|
||||
|
||||
fflush(stdout);
|
||||
while ((ret = mbedtls_ssl_handshake(ssl)) != 0) {
|
||||
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
||||
ESP_LOGE(TAG, "mbedtls_ssl_handshake returned -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
}
|
||||
|
||||
ESP_LOGI(TAG, "Verifying peer X.509 certificate...");
|
||||
|
||||
if ((flags = mbedtls_ssl_get_verify_result(ssl)) != 0) {
|
||||
/* In real life, we probably want to close connection if ret != 0 */
|
||||
ESP_LOGW(TAG, "Failed to verify peer certificate!");
|
||||
mbedtls_x509_crt_verify_info(buf, BUF_SIZE, " ! ", flags);
|
||||
ESP_LOGW(TAG, "verification info: %s", buf);
|
||||
} else {
|
||||
ESP_LOGI(TAG, "Certificate verified.");
|
||||
}
|
||||
|
||||
ESP_LOGI(TAG, "Cipher suite is %s", mbedtls_ssl_get_ciphersuite(ssl));
|
||||
ret = 0; /* No error */
|
||||
|
||||
exit:
|
||||
if (buf) {
|
||||
free(buf);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void smtp_client_task(void *pvParameters)
|
||||
{
|
||||
char *buf = NULL;
|
||||
unsigned char base64_buffer[128];
|
||||
int ret, len;
|
||||
size_t base64_len;
|
||||
|
||||
mbedtls_entropy_context entropy;
|
||||
mbedtls_ctr_drbg_context ctr_drbg;
|
||||
mbedtls_ssl_context ssl;
|
||||
mbedtls_x509_crt cacert;
|
||||
mbedtls_ssl_config conf;
|
||||
mbedtls_net_context server_fd;
|
||||
|
||||
mbedtls_ssl_init(&ssl);
|
||||
mbedtls_x509_crt_init(&cacert);
|
||||
mbedtls_ctr_drbg_init(&ctr_drbg);
|
||||
ESP_LOGI(TAG, "Seeding the random number generator");
|
||||
|
||||
mbedtls_ssl_config_init(&conf);
|
||||
|
||||
mbedtls_entropy_init(&entropy);
|
||||
if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
|
||||
NULL, 0)) != 0) {
|
||||
ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ESP_LOGI(TAG, "Loading the CA root certificate...");
|
||||
|
||||
ret = mbedtls_x509_crt_parse(&cacert, server_root_cert_pem_start,
|
||||
server_root_cert_pem_end - server_root_cert_pem_start);
|
||||
|
||||
if (ret < 0) {
|
||||
ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ESP_LOGI(TAG, "Setting hostname for TLS session...");
|
||||
|
||||
/* Hostname set here should match CN in server certificate */
|
||||
if ((ret = mbedtls_ssl_set_hostname(&ssl, MAIL_SERVER)) != 0) {
|
||||
ESP_LOGE(TAG, "mbedtls_ssl_set_hostname returned -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ESP_LOGI(TAG, "Setting up the SSL/TLS structure...");
|
||||
|
||||
if ((ret = mbedtls_ssl_config_defaults(&conf,
|
||||
MBEDTLS_SSL_IS_CLIENT,
|
||||
MBEDTLS_SSL_TRANSPORT_STREAM,
|
||||
MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
|
||||
ESP_LOGE(TAG, "mbedtls_ssl_config_defaults returned -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_REQUIRED);
|
||||
mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
|
||||
mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
|
||||
#ifdef CONFIG_MBEDTLS_DEBUG
|
||||
mbedtls_esp_enable_debug_log(&conf, 4);
|
||||
#endif
|
||||
|
||||
if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
|
||||
ESP_LOGE(TAG, "mbedtls_ssl_setup returned -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
mbedtls_net_init(&server_fd);
|
||||
|
||||
ESP_LOGI(TAG, "Connecting to %s:%s...", MAIL_SERVER, MAIL_PORT);
|
||||
|
||||
if ((ret = mbedtls_net_connect(&server_fd, MAIL_SERVER,
|
||||
MAIL_PORT, MBEDTLS_NET_PROTO_TCP)) != 0) {
|
||||
ESP_LOGE(TAG, "mbedtls_net_connect returned -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ESP_LOGI(TAG, "Connected.");
|
||||
|
||||
mbedtls_ssl_set_bio(&ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
|
||||
|
||||
buf = (char *) calloc(1, BUF_SIZE);
|
||||
if (buf == NULL) {
|
||||
ESP_LOGE(TAG, "calloc failed for size %d", BUF_SIZE);
|
||||
goto exit;
|
||||
}
|
||||
#if SERVER_USES_STARTSSL
|
||||
/* Get response */
|
||||
ret = write_and_get_response(&server_fd, (unsigned char *) buf, 0);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
|
||||
ESP_LOGI(TAG, "Writing EHLO to server...");
|
||||
len = snprintf((char *) buf, BUF_SIZE, "EHLO %s\r\n", "ESP32");
|
||||
ret = write_and_get_response(&server_fd, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
|
||||
ESP_LOGI(TAG, "Writing STARTTLS to server...");
|
||||
len = snprintf((char *) buf, BUF_SIZE, "STARTTLS\r\n");
|
||||
ret = write_and_get_response(&server_fd, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
|
||||
ret = perform_tls_handshake(&ssl);
|
||||
if (ret != 0) {
|
||||
goto exit;
|
||||
}
|
||||
|
||||
#else /* SERVER_USES_STARTSSL */
|
||||
ret = perform_tls_handshake(&ssl);
|
||||
if (ret != 0) {
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/* Get response */
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, 0);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
ESP_LOGI(TAG, "Writing EHLO to server...");
|
||||
|
||||
len = snprintf((char *) buf, BUF_SIZE, "EHLO %s\r\n", "ESP32");
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
|
||||
#endif /* SERVER_USES_STARTSSL */
|
||||
|
||||
/* Authentication */
|
||||
ESP_LOGI(TAG, "Authentication...");
|
||||
|
||||
ESP_LOGI(TAG, "Write AUTH LOGIN");
|
||||
len = snprintf( (char *) buf, BUF_SIZE, "AUTH LOGIN\r\n" );
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 399, exit);
|
||||
|
||||
ESP_LOGI(TAG, "Write USER NAME");
|
||||
ret = mbedtls_base64_encode((unsigned char *) base64_buffer, sizeof(base64_buffer),
|
||||
&base64_len, (unsigned char *) SENDER_MAIL, strlen(SENDER_MAIL));
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "Error in mbedtls encode! ret = -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
len = snprintf((char *) buf, BUF_SIZE, "%s\r\n", base64_buffer);
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 300, 399, exit);
|
||||
|
||||
ESP_LOGI(TAG, "Write PASSWORD");
|
||||
ret = mbedtls_base64_encode((unsigned char *) base64_buffer, sizeof(base64_buffer),
|
||||
&base64_len, (unsigned char *) SENDER_PASSWORD, strlen(SENDER_PASSWORD));
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "Error in mbedtls encode! ret = -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
len = snprintf((char *) buf, BUF_SIZE, "%s\r\n", base64_buffer);
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 399, exit);
|
||||
|
||||
/* Compose email */
|
||||
ESP_LOGI(TAG, "Write MAIL FROM");
|
||||
len = snprintf((char *) buf, BUF_SIZE, "MAIL FROM:<%s>\r\n", SENDER_MAIL);
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
|
||||
ESP_LOGI(TAG, "Write RCPT");
|
||||
len = snprintf((char *) buf, BUF_SIZE, "RCPT TO:<%s>\r\n", RECIPIENT_MAIL);
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
|
||||
ESP_LOGI(TAG, "Write DATA");
|
||||
len = snprintf((char *) buf, BUF_SIZE, "DATA\r\n");
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 300, 399, exit);
|
||||
|
||||
ESP_LOGI(TAG, "Write Content");
|
||||
/* We do not take action if message sending is partly failed. */
|
||||
len = snprintf((char *) buf, BUF_SIZE,
|
||||
"From: %s\r\nSubject: mbed TLS Test mail\r\n"
|
||||
"To: %s\r\n"
|
||||
"MIME-Version: 1.0 (mime-construct 1.9)\n",
|
||||
"ESP32 SMTP Client", RECIPIENT_MAIL);
|
||||
|
||||
/**
|
||||
* Note: We are not validating return for some ssl_writes.
|
||||
* If by chance, it's failed; at worst email will be incomplete!
|
||||
*/
|
||||
ret = write_ssl_data(&ssl, (unsigned char *) buf, len);
|
||||
|
||||
/* Multipart boundary */
|
||||
len = snprintf((char *) buf, BUF_SIZE,
|
||||
"Content-Type: multipart/mixed;boundary=XYZabcd1234\n"
|
||||
"--XYZabcd1234\n");
|
||||
ret = write_ssl_data(&ssl, (unsigned char *) buf, len);
|
||||
|
||||
/* Text */
|
||||
len = snprintf((char *) buf, BUF_SIZE,
|
||||
"Content-Type: text/plain\n"
|
||||
"This is a simple test mail from the SMTP client example.\r\n"
|
||||
"\r\n"
|
||||
"Enjoy!\n\n--XYZabcd1234\n");
|
||||
ret = write_ssl_data(&ssl, (unsigned char *) buf, len);
|
||||
|
||||
/* Attachment */
|
||||
len = snprintf((char *) buf, BUF_SIZE,
|
||||
"Content-Type: image/image/png;name=esp_logo.png\n"
|
||||
"Content-Transfer-Encoding: base64\n"
|
||||
"Content-Disposition:attachment;filename=\"esp_logo.png\"\n");
|
||||
ret = write_ssl_data(&ssl, (unsigned char *) buf, len);
|
||||
|
||||
/* Image contents... */
|
||||
const uint8_t *offset = esp_logo_png_start;
|
||||
while (offset < esp_logo_png_end - 1) {
|
||||
int read_bytes = MIN(((sizeof (base64_buffer) - 1) / 4) * 3, esp_logo_png_end - offset - 1);
|
||||
ret = mbedtls_base64_encode((unsigned char *) base64_buffer, sizeof(base64_buffer),
|
||||
&base64_len, (unsigned char *) offset, read_bytes);
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "Error in mbedtls encode! ret = -0x%x", -ret);
|
||||
goto exit;
|
||||
}
|
||||
offset += read_bytes;
|
||||
len = snprintf((char *) buf, BUF_SIZE, "%s\r\n", base64_buffer);
|
||||
ret = write_ssl_data(&ssl, (unsigned char *) buf, len);
|
||||
}
|
||||
|
||||
len = snprintf((char *) buf, BUF_SIZE, "\n--XYZabcd1234\n");
|
||||
ret = write_ssl_data(&ssl, (unsigned char *) buf, len);
|
||||
|
||||
len = snprintf((char *) buf, BUF_SIZE, "\r\n.\r\n");
|
||||
ret = write_ssl_and_get_response(&ssl, (unsigned char *) buf, len);
|
||||
VALIDATE_MBEDTLS_RETURN(ret, 200, 299, exit);
|
||||
ESP_LOGI(TAG, "Email sent!");
|
||||
|
||||
/* Close connection */
|
||||
mbedtls_ssl_close_notify(&ssl);
|
||||
ret = 0; /* No errors */
|
||||
|
||||
exit:
|
||||
mbedtls_ssl_session_reset(&ssl);
|
||||
mbedtls_net_free(&server_fd);
|
||||
|
||||
if (ret != 0) {
|
||||
mbedtls_strerror(ret, buf, 100);
|
||||
ESP_LOGE(TAG, "Last error was: -0x%x - %s", -ret, buf);
|
||||
}
|
||||
|
||||
putchar('\n'); /* Just a new line */
|
||||
if (buf) {
|
||||
free(buf);
|
||||
}
|
||||
vTaskDelete(NULL);
|
||||
}
|
||||
|
||||
void app_main()
|
||||
{
|
||||
ESP_ERROR_CHECK(nvs_flash_init());
|
||||
ESP_ERROR_CHECK(esp_netif_init());
|
||||
ESP_ERROR_CHECK(esp_event_loop_create_default());
|
||||
|
||||
/**
|
||||
* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
|
||||
* Read "Establishing Wi-Fi or Ethernet Connection" section in
|
||||
* examples/protocols/README.md for more information about this function.
|
||||
*/
|
||||
ESP_ERROR_CHECK(example_connect());
|
||||
xTaskCreate(&smtp_client_task, "smtp_client_task", TASK_STACK_SIZE, NULL, 5, NULL);
|
||||
}
|
||||
Ładowanie…
Reference in New Issue