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A Language Server Protocol implementation for the OpenSIPS routing script language (opensips.cfg).

What it does

Feature	How
Diagnostics	Runs opensips -C -f <file> on open/save and maps its parse errors (file:line:col) to LSP diagnostics — full-fidelity, version-exact semantic validation by the real parser. A fast analyzer layer warns between saves (debounced on change): undefined route() targets and duplicate route definitions.
Completion	Context-sensitive: module names after loadmodule " / modparam(", the module's parameters inside the second modparam argument, exported functions of loaded modules plus core functions/parameters, route names inside route( and in route bodies, keywords, and pseudo-variables after $ (replacing the typed token). Duplicate labels collapse; include_file/import_file closures count.
Hover	Documentation for module functions, parameters, and modules, harvested from the OpenSIPS docs.
Signature help	The innermost unclosed call's signature with the active parameter, on ( and ,.
Go to definition	route(name) references resolve to their route[name] block — in this file or any included file.
References / rename / highlights	Every call site + definition of a route name; rename rewrites them all (charset-gated, quoted call sites handled).
Document symbols	All route blocks (route, failure_route, onreply_route, …) with full block extents, nested outline.
Folding	Route-family blocks fold; brace matching is string/comment-safe.
Workspace symbols	Ctrl+T route search across open files and includes.
Code lenses	Reference counts above route definitions (include-closure-wide).
Quick fixes	Load the module exporting an unknown function; create a missing route stub.
Catalog-pinned validation	Undocumented modparam parameters flagged against YOUR source tree's docs.
Semantic tokens	Route names and pseudo-variables colored by analysis.
CLI	opensips-lsp check [--strict] [--bin <opensips>] <file>... for CI/git hooks.

Positions are exchanged in UTF-16 units (the LSP default) and are correct on multibyte lines; doc harvests are cached per source tree (see the admin guide's Caching section).

The documentation catalog is harvested at startup from an OpenSIPS source tree. The 4.x markdown docs (modules/*/README.md) are the most current and win; docbook (modules/*/doc/*_admin.xml) is the fallback for older trees or placeholder READMEs. Core-language docs (functions, parameters, pseudo-variables) come from docs/manual/.

Supported and version-proven: OpenSIPS 4.x (master) and 3.6.x (3.6.8) — the proof suite runs against a real tree and binary of each (OPENSIPS_LSP_TEST_TREE/OPENSIPS_LSP_TEST_BIN).

Configuration

Via LSP initializationOptions (or environment fallback):

Option	Env	Default	Meaning
opensipsPath	OPENSIPS_LSP_BIN	opensips	Binary used for -C diagnostics.
opensipsSrc	OPENSIPS_LSP_SRC	(none)	Source tree to harvest module docs from.

Diagnostics fidelity note: -C loads the modules the cfg references, so it needs a tree/installation where those .so files exist (an unresolvable module is itself reported as a diagnostic, which is usually what you want).

Install

New to all of this? Follow the Getting Started guide — one-command install plus click-by-click usage instructions. Short version:

curl -fsSL https://raw.githubusercontent.com/NormB/opensips-lsp/main/install.sh | sh

Prebuilt server binaries (Linux, macOS, and Windows (x86_64 and arm64)) and the VS Code .vsix ship with every GitHub release:

tar xzf opensips-lsp-<version>-x86_64-linux-gnu.tar.gz
install -m755 opensips-lsp ~/.local/bin/

Build & test

cargo build --release        # server binary: target/release/opensips-lsp
cargo test                   # full suite, includes a stdio LSP e2e test

Tree-sitter grammar

tree-sitter-opensips/ carries an error-tolerant grammar for editors that highlight and fold via tree-sitter (Neovim, Helix, Zed): corpus tests run in CI; tree-sitter generate builds the parser locally.

Documentation

• Features-and-Settings — every feature, every setting (VS Code / init option / environment), and the snippet set.
• Admin-Guide — admin guide in the OpenSIPS module-doc structure (overview, dependencies, exported parameters, security, FAQ). Its structure is itself validated by the test suite through this project's own OpenSIPS-README harvester.
• Editor-Setup — setup for VS Code, Neovim, Helix, Emacs, Vim, Sublime Text, and Kate.
• API docs: cargo doc --open (missing_docs is deny).

Editors

• VS Code: the client/ directory contains the extension (npm install && npm run compile, then run/package with vsce). Settings: opensipsLsp.serverPath, opensipsLsp.opensipsPath, opensipsLsp.opensipsSrc.

• Neovim (0.10+):

  vim.api.nvim_create_autocmd("FileType", {
    pattern = "opensips-cfg",
    callback = function()
      vim.lsp.start({
        name = "opensips-lsp",
        cmd = { "opensips-lsp" },
        init_options = {
          opensipsPath = "/usr/local/sbin/opensips",
          opensipsSrc = "/path/to/opensips",
        },
      })
    end,
  })

Design

• src/catalog.rs — docbook + markdown documentation harvester
• src/analyze.rs — comment/string-aware lexical scan of cfg text (loadmodules, routes, cursor context); deliberately not a grammar
• src/diag.rs — opensips -C output parser
• src/logic.rs — pure completion/hover/definition assembly
• src/server.rs — tower-lsp wiring

Semantic truth stays in OpenSIPS itself (-C); the server never guesses about grammar validity, so it is automatically correct for whatever OpenSIPS version it is pointed at.

Security note

opensips -C dlopens the modules the cfg loads — their constructors run. Opening a config from an untrusted source therefore executes code paths you did not write. Rely on your editor's workspace-trust prompt, and/or disable diagnostics entirely by setting opensipsPath (or OPENSIPS_LSP_BIN) to an empty string — completion, hover, and navigation keep working without it. -C runs are serialized and bounded (10s default, OPENSIPS_LSP_CHECK_TIMEOUT_MS to tune).

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE)
• MIT license (LICENSE-MIT)

at your option. Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.