シンプルなメールクライアントを作成し、ソケットを使用して(smtp libを使用せずに)Google smtpサーバーに接続するという割り当てがあります。ただし、MAIL FROMコマンドをGoogle smtpサーバーに発行するにはsslまたはtlsが必要であり、これは私が理解できない部分です。したがって、Pythonの ssl.wrap_socket() メソッドを使用しようとしています....
# Create socket called clientSocket and establish a TCP connection with mailserver
clientSocket = socket(AF_INET, SOCK_STREAM)
ssl_clientSocket = ssl.wrap_socket(clientSocket)
ssl_clientSocket.connect((mailserver, port))
...これは機能していません。ca_certs および ca_reqs パラメータを含める必要があることは確かですが、よくわかりません。その場合、これらの証明書を取得するにはどうすればよいですか? openssl をダウンロードして生成する必要がありますか? これを経験した人はいますか?安全のためにコード全体を次に示します。
from socket import *
import ssl
msg = "\r\n I love computer networks!"
endmsg = "\r\n.\r\n"
# Choose a mail server (e.g. Google mail server) and call it mailserver
mailserver = "smtp.gmail.com"
port = 587
# Create socket called clientSocket and establish a TCP connection with mailserver
clientSocket = socket(AF_INET, SOCK_STREAM)
ssl_clientSocket = ssl.wrap_socket(clientSocket)
ssl_clientSocket.connect((mailserver, port))
recv = ssl_clientSocket.recv(1024)
print
print recv
# If the first three numbers of what we receive from the SMTP server are not
# '220', we have a problem
if recv[:3] != '220':
print '220 reply not received from server.'
# Send HELO command and print server response.
heloCommand = 'HELO Alice\r\n'
ssl_clientSocket.send(heloCommand)
recv1 = ssl_clientSocket.recv(1024)
print recv1
# If the first three numbers of the response from the server are not
# '250', we have a problem
if recv1[:3] != '250':
print '250 reply not received from server.'
# Send MAIL FROM command and print server response.
mailFromCommand = 'MAIL From: wgimson@gmail.com\r\n'
ssl_clientSocket.send(mailFromCommand)
recv2 = ssl_clientSocket.recv(1024)
print recv2
# If the first three numbers of the response from the server are not
# '250', we have a problem
if recv2[:3] != '250':
print '250 reply not received from server.'
# Send RCPT TO command and print server response.
rcptToCommand = 'RCPT To: macyali@gmail.com\r\n'
ssl_clientSocket.send(rcptToCommand)
recv3 = ssl_clientSocket.recv(1024)
print recv3
# If the first three numbers of the response from the server are not
# '250', we have a problem
if recv3[:3] != '250':
print '250 reply not received from server.'
# Send DATA command and print server response.
dataCommand = 'DATA\r\n'
ssl_clientSocket.send(dataCommand)
recv4 = ssl_clientSocket.recv(1024)
print recv4
# If the first three numbers of the response from the server are not
# '250', we have a problem
if recv4[:3] != '250':
print '250 reply not received from server.'
# Send message data.
ssl_clientSocket.send(msg)
# Message ends with a single period.
ssl_clientSocket.send(endmsg)
# Send QUIT command and get server response.
quitCommand = 'QUIT\r\n'
ssl_clientSocket.send(quitCommand)
recv5 = ssl_clientSocket.recv(I1024)
print recv5
# If the first three numbers of the response from the server are not
# '250', we have a problem
if recv5[:3] != '221':
print '221 reply not received from server.'