Commit Graph
2 Commits
Author SHA1 Message Date
catarrh cb4c07f3c2 Fix GSMTAP linktype + type/sub-type values so Wireshark decodes PCAP
pcap.py: LINKTYPE_GSMTAP (155) was wrong — 155 is DLT_USER8, so
Wireshark showed 'USER 8 / DLT=155'. Now write Ethernet-encapsulated
PCAP (LINKTYPE 1): each GSMTAP message wrapped in Ethernet + IPv4 +
UDP (port 4729), with correct checksums — matching a real tcpdump
capture of GSMTAP-over-UDP and how Wireshark's gsmtap dissector is keyed.

gsmtap.py: GSMTAP_TYPE_SIM was 0x07 (WiMAX burst) — corrected to 0x04;
GSMTAP_SIM_APDU was 0x02 (PPS req) — corrected to 0x00; added PPS_REQ/
PPS_RSP. These match libosmocore/Wireshark packet-gsmtap.h.

Verified with tshark: PCAP now decodes as GSM SIM (SELECT/STATUS/ATR)
instead of 'USER 8'.

tests: pcap tests assert Ethernet linktype + framing + GSMTAP payload.
2026-08-12 21:32:21 +03:00
catarrh e09aac4cb7 Add session export to PCAP
pcap.py: build_pcap(packets) — build PCAP bytes in memory (same format
as PcapWriter)
database.py: get_messages_raw() — raw elapsed/type/data without decode
server.py: GET /api/sessions/<id>/pcap generates a GSMTAP-encapsulated
PCAP (ATR/TPDU) with real timestamps and downloads it as
<session-name>.pcap (ASCII filename fallback + RFC 5987 UTF-8 for
spaces/unicode via _content_disposition)

tests: build_pcap + _content_disposition (67 total)
2026-08-12 21:16:11 +03:00