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2cda5bf59b
* Surface ASN info and fall back to it when a PTR is absent Adds three new fields to every IP source record — ``asn`` (integer, e.g. 15169), ``asn_name`` (``"Google LLC"``), ``asn_domain`` (``"google.com"``) — sourced from the bundled IPinfo Lite MMDB. These flow through to CSV, JSON, Elasticsearch, OpenSearch, and Splunk outputs as ``source_asn``, ``source_asn_name``, ``source_asn_domain``. More importantly: when an IP has no reverse DNS (common for many large senders), source attribution now falls back to the ASN domain as a lookup key into the same ``reverse_dns_map``. Thanks to #712 and #714, ~85% of routed IPv4 space now has an ``as_domain`` that hits the map, so rows that were previously unattributable now get a ``source_name``/``source_type`` derived from the ASN. When the ASN domain misses the map, the raw AS name is used as ``source_name`` with ``source_type`` left null — still better than nothing. Crucially, ``source_reverse_dns`` and ``source_base_domain`` remain null on ASN-derived rows, so downstream consumers can still tell a PTR-resolved attribution apart from an ASN-derived one. ASN is stored as an integer at the schema level (Elasticsearch / OpenSearch mappings use ``Integer``) so consumers can do range queries and numeric sorts; dashboards can prepend ``AS`` at display time. The MMDB reader normalizes both IPinfo's ``"AS15169"`` string and MaxMind's ``autonomous_system_number`` int to the same int form. Also fixes a pre-existing caching bug in ``get_ip_address_info``: entries without reverse DNS were never written to the IP-info cache, so every no-PTR IP re-did the MMDB read and DNS attempt on every call. The cache write is now unconditional. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * Bump to 9.9.0 and document the ASN fallback work Updates the changelog with a 9.9.0 entry covering the ASN-domain aliases (#712, #714), map-maintenance tooling fixes (#713), and the ASN-fallback source attribution added in this branch. Extends AGENTS.md to explain that ``base_reverse_dns_map.csv`` is now a mixed-namespace map (rDNS bases alongside ASN domains) and adds a short recipe for finding high-value ASN-domain misses against the bundled MMDB, so future contributors know where the map's second lookup path comes from. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * Document project conventions previously held only in agent memory Promotes four conventions out of per-agent memory and into AGENTS.md so every contributor — human or agent — works from the same baseline: - Run ruff check + format before committing (Code Style). - Store natively numeric values as numbers, not pre-formatted strings (e.g. ASN as int 15169, not "AS15169"; ES/OS mappings as Integer) (Code Style). - Before rewriting a tracked list/data file from freshly-generated content, verify the existing content via git — these files accumulate manually-curated entries across sessions (Editing tracked data files). - A release isn't done until hatch-built sdist + wheel are attached to the GitHub release page; full 8-step sequence documented (Releases). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Sean Whalen <seanthegeek@users.noreply.github.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Sample outputs
Sample aggregate report output
Here are the results from parsing the example report from the dmarc.org wiki. It's actually an older draft of the 1.0 report schema standardized in RFC 7480 Appendix C. This draft schema is still in wide use.
parsedmarc produces consistent, normalized output, regardless
of the report schema.
JSON aggregate report
{
"xml_schema": "draft",
"report_metadata": {
"org_name": "acme.com",
"org_email": "noreply-dmarc-support@acme.com",
"org_extra_contact_info": "http://acme.com/dmarc/support",
"report_id": "9391651994964116463",
"begin_date": "2012-04-27 20:00:00",
"end_date": "2012-04-28 19:59:59",
"timespan_requires_normalization": false,
"original_timespan_seconds": 86399,
"errors": []
},
"policy_published": {
"domain": "example.com",
"adkim": "r",
"aspf": "r",
"p": "none",
"sp": "none",
"pct": "100",
"fo": "0"
},
"records": [
{
"source": {
"ip_address": "72.150.241.94",
"country": "US",
"reverse_dns": null,
"base_domain": null,
"name": null,
"type": null,
"asn": 7018,
"asn_name": "AT&T Services, Inc.",
"asn_domain": "att.com"
},
"count": 2,
"alignment": {
"spf": true,
"dkim": false,
"dmarc": true
},
"policy_evaluated": {
"disposition": "none",
"dkim": "fail",
"spf": "pass",
"policy_override_reasons": []
},
"identifiers": {
"header_from": "example.com",
"envelope_from": "example.com",
"envelope_to": null
},
"auth_results": {
"dkim": [
{
"domain": "example.com",
"selector": "none",
"result": "fail"
}
],
"spf": [
{
"domain": "example.com",
"scope": "mfrom",
"result": "pass"
}
]
},
"normalized_timespan": false,
"interval_begin": "2012-04-28 00:00:00",
"interval_end": "2012-04-28 23:59:59"
}
]
}
CSV aggregate report
xml_schema,org_name,org_email,org_extra_contact_info,report_id,begin_date,end_date,normalized_timespan,errors,domain,adkim,aspf,p,sp,pct,fo,source_ip_address,source_country,source_reverse_dns,source_base_domain,source_name,source_type,source_asn,source_asn_name,source_asn_domain,count,spf_aligned,dkim_aligned,dmarc_aligned,disposition,policy_override_reasons,policy_override_comments,envelope_from,header_from,envelope_to,dkim_domains,dkim_selectors,dkim_results,spf_domains,spf_scopes,spf_results
draft,acme.com,noreply-dmarc-support@acme.com,http://acme.com/dmarc/support,9391651994964116463,2012-04-28 00:00:00,2012-04-28 23:59:59,False,,example.com,r,r,none,none,100,0,72.150.241.94,US,,,,,2,True,False,True,none,,,example.com,example.com,,example.com,none,fail,example.com,mfrom,pass
draft,acme.com,noreply-dmarc-support@acme.com,http://acme.com/dmarc/support,9391651994964116463,2012-04-28 00:00:00,2012-04-28 23:59:59,False,,example.com,r,r,none,none,100,0,72.150.241.94,US,,,,,2,True,False,True,none,,,example.com,example.com,,example.com,none,fail,example.com,mfrom,pass
Sample forensic report output
Thanks to GitHub user xennn for the anonymized forensic report email sample.
JSON forensic report
{
"feedback_type": "auth-failure",
"user_agent": "Lua/1.0",
"version": "1.0",
"original_mail_from": "sharepoint@domain.de",
"original_rcpt_to": "peter.pan@domain.de",
"arrival_date": "Mon, 01 Oct 2018 11:20:27 +0200",
"message_id": "<38.E7.30937.BD6E1BB5@ mailrelay.de>",
"authentication_results": "dmarc=fail (p=none, dis=none) header.from=domain.de",
"delivery_result": "policy",
"auth_failure": [
"dmarc"
],
"reported_domain": "domain.de",
"arrival_date_utc": "2018-10-01 09:20:27",
"source": {
"ip_address": "10.10.10.10",
"country": null,
"reverse_dns": null,
"base_domain": null,
"name": null,
"type": null,
"asn": null,
"asn_name": null,
"asn_domain": null
},
"authentication_mechanisms": [],
"original_envelope_id": null,
"dkim_domain": null,
"sample_headers_only": false,
"sample": "Received: from Servernameone.domain.local (Servernameone.domain.local [10.10.10.10])\n\tby mailrelay.de (mail.DOMAIN.de) with SMTP id 38.E7.30937.BD6E1BB5; Mon, 1 Oct 2018 11:20:27 +0200 (CEST)\nDate: 01 Oct 2018 11:20:27 +0200\nMessage-ID: <38.E7.30937.BD6E1BB5@ mailrelay.de>\nTo: <peter.pan@domain.de>\nfrom: \"=?utf-8?B?SW50ZXJha3RpdmUgV2V0dGJld2VyYmVyLcOcYmVyc2ljaHQ=?=\" <sharepoint@domain.de>\nSubject: Subject\nMIME-Version: 1.0\nX-Mailer: Microsoft SharePoint Foundation 2010\nContent-Type: text/html; charset=utf-8\nContent-Transfer-Encoding: quoted-printable\n\n<html><head><base href=3D'\nwettbewerb' /></head><body><!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2//EN\"=\n><HTML><HEAD><META NAME=3D\"Generator\" CONTENT=3D\"MS Exchange Server version=\n 08.01.0240.003\"></html>\n",
"parsed_sample": {
"from": {
"display_name": "Interaktive Wettbewerber-Übersicht",
"address": "sharepoint@domain.de",
"local": "sharepoint",
"domain": "domain.de"
},
"to_domains": [
"domain.de"
],
"to": [
{
"display_name": null,
"address": "peter.pan@domain.de",
"local": "peter.pan",
"domain": "domain.de"
}
],
"subject": "Subject",
"timezone": "+2",
"mime-version": "1.0",
"date": "2018-10-01 09:20:27",
"content-type": "text/html; charset=utf-8",
"x-mailer": "Microsoft SharePoint Foundation 2010",
"body": "<html><head><base href='\nwettbewerb' /></head><body><!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2//EN\"><HTML><HEAD><META NAME=\"Generator\" CONTENT=\"MS Exchange Server version 08.01.0240.003\"></html>",
"received": [
{
"from": "Servernameone.domain.local Servernameone.domain.local 10.10.10.10",
"by": "mailrelay.de mail.DOMAIN.de",
"with": "SMTP id 38.E7.30937.BD6E1BB5",
"date": "Mon, 1 Oct 2018 11:20:27 +0200 CEST",
"hop": 1,
"date_utc": "2018-10-01 09:20:27",
"delay": 0
}
],
"content-transfer-encoding": "quoted-printable",
"message-id": "<38.E7.30937.BD6E1BB5@ mailrelay.de>",
"has_defects": false,
"headers": {
"Received": "from Servernameone.domain.local (Servernameone.domain.local [10.10.10.10])\n\tby mailrelay.de (mail.DOMAIN.de) with SMTP id 38.E7.30937.BD6E1BB5; Mon, 1 Oct 2018 11:20:27 +0200 (CEST)",
"Date": "01 Oct 2018 11:20:27 +0200",
"Message-ID": "<38.E7.30937.BD6E1BB5@ mailrelay.de>",
"To": "<peter.pan@domain.de>",
"from": "\"Interaktive Wettbewerber-Übersicht\" <sharepoint@domain.de>",
"Subject": "Subject",
"MIME-Version": "1.0",
"X-Mailer": "Microsoft SharePoint Foundation 2010",
"Content-Type": "text/html; charset=utf-8",
"Content-Transfer-Encoding": "quoted-printable"
},
"reply_to": [],
"cc": [],
"bcc": [],
"attachments": [],
"filename_safe_subject": "Subject"
}
}
CSV forensic report
feedback_type,user_agent,version,original_envelope_id,original_mail_from,original_rcpt_to,arrival_date,arrival_date_utc,subject,message_id,authentication_results,dkim_domain,source_ip_address,source_country,source_reverse_dns,source_base_domain,source_name,source_type,source_asn,source_asn_name,source_asn_domain,delivery_result,auth_failure,reported_domain,authentication_mechanisms,sample_headers_only
auth-failure,Lua/1.0,1.0,,sharepoint@domain.de,peter.pan@domain.de,"Mon, 01 Oct 2018 11:20:27 +0200",2018-10-01 09:20:27,Subject,<38.E7.30937.BD6E1BB5@ mailrelay.de>,"dmarc=fail (p=none, dis=none) header.from=domain.de",,10.10.10.10,,,,policy,dmarc,domain.de,,False
JSON SMTP TLS report
[
{
"organization_name": "Example Inc.",
"begin_date": "2024-01-09T00:00:00Z",
"end_date": "2024-01-09T23:59:59Z",
"report_id": "2024-01-09T00:00:00Z_example.com",
"policies": [
{
"policy_domain": "example.com",
"policy_type": "sts",
"policy_strings": [
"version: STSv1",
"mode: testing",
"mx: example.com",
"max_age: 86400"
],
"successful_session_count": 0,
"failed_session_count": 3,
"failure_details": [
{
"result_type": "validation-failure",
"failed_session_count": 2,
"sending_mta_ip": "209.85.222.201",
"receiving_ip": "173.212.201.41",
"receiving_mx_hostname": "example.com"
},
{
"result_type": "validation-failure",
"failed_session_count": 1,
"sending_mta_ip": "209.85.208.176",
"receiving_ip": "173.212.201.41",
"receiving_mx_hostname": "example.com"
}
]
}
]
}
]