An app-layer-state comparison that can never hold - mode '>' at or beyond
the completion state, or mode '<' at the starting state - can never match.
Both are fatal at rule load, so reject them at parsing.
The LTE (<hook) form at the first state (progress 0) is accepted and is
equivalent to the plain hook form: there are no prior states to auto-accept.
Derive the completion state from the direction the keyword resolved in
instead of the rule's flags, and document the new load time rejections.
Ticket: #8944.
State table and failure/completion semantics for the
per-direction scale (banner/kex/session, done never reported),
the removed banner_wait_eol state and legacy hook names, the new
eve ssh error/state fields, and the transactions/lua/upgrade
examples - all updated to match.
Ticket: #9046.
Extend the app-layer-protocol keyword to accept a pipe-separated list of
protocol values, so a single rule can match any of several protocols:
app-layer-protocol:[!]<proto1>|<proto2>[|...][,<qualifier>]...;
A non-negated list matches when the flow's protocol equals any listed value
(OR); a negated list matches when it equals none of them (NOR). The
single-value form and the trailing mode qualifier are unchanged.
Matching keeps the historical AppProtoEquals() equivalences by default
(dns/doh2, http/http1/http2, dcerpc/smb, ...). An `exact` qualifier selects
strict identity matching with no equivalences and no http umbrella; it
combines with a direction mode in any order. Because a flow is never the
generic ALPROTO_HTTP, `http,exact` is rejected at load.
Values are expanded once at rule load into an effective match-set bitmask, so
the per-packet match is a single bitmask test. Single-value rules remain
prefilterable; multi-value rules are excluded from prefiltering and an
explicit prefilter on them is rejected. Conflicting keyword combinations
(duplicate or overlapping negations, mixed positive/negated) are rejected at
load. Engine-analysis reports the effective match set.
Ticket: 7705
Victor Julien
Yash Datre
Philippe Antoine
Victor Julien