The error log is rather odd and is coming with a debugging output I add myself only:
[Sat Jul 31 10:13:29.824371 2021] [:debug] [pid 30273:tid 3027227680] src/mod_mini_booking.c(73): [client 81.169.144.135:34004] handleBooking(): smtp failed with Failed to authenticate with the given credentials, referer: <WEBSITE>
The smtp-client code generating this is:
struct smtp *smtp;
smtp_status_code rc;
rc = smtp_open(<SMTPSERVER>", "465",
SMTP_SECURITY_TLS, SMTP_NO_CERT_VERIFY, NULL, &smtp);
rc = smtp_auth(smtp, SMTP_AUTH_LOGIN, <EMAIL>, <PASSWORD>);
rc = smtp_address_add(smtp, SMTP_ADDRESS_FROM, <EMAIL>, <WEBSITENAME>);
rc = smtp_address_add(smtp, SMTP_ADDRESS_TO, form("email"), form("name"));
rc = smtp_header_add(smtp, "Subject", "Buchungsbestätigung");
rc = smtp_mail(smtp, "BODY");
rc = smtp_close(smtp);
if (rc==SMTP_STATUS_OK)
debug("handleBooking(): sent mail successfully");
else
debug("handleBooking(): smtp failed with %s", smtp_status_code_errstr(rc));
With <WEBSITE>, <SMTPSERVER>, <EMAIL>, <PASSWORD>, <WEBSITENAME> added for privacy reasons.
The sequence fails when calling smtp_auth(), rc is carried on by this library.
The smtp library sends debugging output to stderr. This would be interesting to see. Any idea where stderr is forwarded to by apache?
> On 31. Jul 2021, at 11:55, Antony Stone <Antony.Stone@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Saturday 31 July 2021 at 11:46:50, Harald Schlangmann wrote:
>
>> First post to this group, so please forgive anything I'm doing wrong.
>
> Welcome.
>
>> Problem: everything is going fine except for sending a confirmation mail to
>> users once a booking has been successful. I use
>> https://github.com/somnisoft/smtp-client as a simple C based SMTP client
>> embedded into the module. While the function to send a mail is working
>> fine when compiling it as a separate C program and running it from the
>> command line, it fails when embedding the function into my Apache module.
>
> Show us details of what "fails" means.
>
> Minimum: what shows up in Apache's log files when the email is supposed to be
> sent.
>
> Maybe helpful: a packet capture (using something like tcpdump or tshark) of
> any communication with the remote mail server.
>
> Also "For SMTP, port 465 and TLS security (openssl) is used."
>
> Try starting simple and eliminate the TLS - just send SMTP to some mail server
> on port 25. If that works, we know it's not the module per se, and we can
> focus on the SSL library.
>
>
> Antony.
>
> --
> People say that nothing is impossible, so I try to do the impossible every
> day.
>
> Please reply to the list;
> please *don't* CC me.
>
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