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Wed, 26 Mar 2025 00:53:09 -0700 (PDT) Received: from localhost.localdomain ([39.184.61.9]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-af8a2803d8csm10330068a12.26.2025.03.26.00.53.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Mar 2025 00:53:08 -0700 (PDT) From: Zheng Yuting <05zyt30@gmail.com> X-Google-Original-From: Zheng Yuting <05ZYT30@gmail.com> To: 05zyt30@gmail.com Cc: git@vger.kernel.org, gitster@pobox.com, meetsoni3017@gmail.com, Zheng Yuting <05ZYT30@gmail.com> Subject: [GSoC PATCH v9 2/2] send-email: finer-grained SMTP error handling Date: Wed, 26 Mar 2025 15:52:46 +0800 Message-ID: <20250326075246.2612627-3-05ZYT30@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250326075246.2612627-1-05ZYT30@gmail.com> References: <20250324145332.571813-1-05ZYT30@gmail.com> <20250326075246.2612627-1-05ZYT30@gmail.com> Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Code captured errors but did not process them further. This treated all failures the same without distinguishing SMTP status. Add handle-smtp_error to extract SMTP status codes using a regex (as defined in RFC 5321) and handle errors as follows: - No error present: - If a result is provided, return 1 to indicate success. - Otherwise, return 0 to indicate failure. - Error present with a captured three-digit status code: - For 4yz (transient errors), return 1 and allow retries. - For 5yz (permanent errors), return 0 to indicate failure. - For any other recognized status code, return 1, treating it as a transient error. - Error present but no status code found: - Return 1 as a transient error. Signed-off-by: Zheng Yuting <05ZYT30@gmail.com> --- git-send-email.perl | 32 +++++++++++++++++++++++++++++--- 1 file changed, 29 insertions(+), 3 deletions(-) diff --git a/git-send-email.perl b/git-send-email.perl index 0f05f55e50..1f613fa979 100755 --- a/git-send-email.perl +++ b/git-send-email.perl @@ -1454,14 +1454,40 @@ sub smtp_auth_maybe { $error = $@ || 'Unknown error'; }; - # NOTE: SMTP status code handling will be added in a subsequent commit, - # return 1 when failed due to non-credential reasons - return $error ? 1 : ($result ? 1 : 0); + return ($error + ? handle_smtp_error($error) + : ($result ? 1 : 0)); }); return $auth; } +sub handle_smtp_error { + my ($error) = @_; + + # Parse SMTP status code from error message in: + # https://www.rfc-editor.org/rfc/rfc5321.html + if ($error =~ /\b(\d{3})\b/) { + my $status_code = $1; + if ($status_code =~ /^4/) { + # 4yz: Transient Negative Completion reply + warn "SMTP transient error (status code $status_code): $error"; + return 1; + } elsif ($status_code =~ /^5/) { + # 5yz: Permanent Negative Completion reply + warn "SMTP permanent error (status code $status_code): $error"; + return 0; + } + # If no recognized status code is found, treat as transient error + warn "SMTP unknown error: $error. Treating as transient failure."; + return 1; + } + + # If no status code is found, treat as transient error + warn "SMTP generic error: $error"; + return 1; +} + sub ssl_verify_params { eval { require IO::Socket::SSL;