libstrophe is a minimal XMPP library written in C. It has almost no external dependencies, only an XML parsing library (expat or libxml are both supported). It is designed for both POSIX and Windows systems.

Quick Links

License

libstrophe is dual licensed under the MIT or GPLv3 licenses.

Author

libstrophe was originally created by Jack Moffitt and has been maintained by him until 2014. After that Dmitry Podgorny was the major maintainer until 2022, when he passed the maintainer hat over to Steffen Jaeckel.

Features

Authentication with RFC4422 SASL.

Supported methods are: PLAIN, DIGEST-MD5, ANONYMOUS, SCRAM-SHA{1,256,512}, SCRAM-SHA{1,256}-PLUS, EXTERNAL.

Legacy authentication via _xmpp_auth1 can be enabled if required (disabled by default).
Secure connection with TLS via GnuTLS, LibreSSL, OpenSSL or SCHANNEL (only on Windows).

Supported mechanisms are: STARTTLS on port 5222 and legacy mode on port 5223.
TLS client authentication with XEP-0178 SASL EXTERNAL (only with GnuTLS, LibreSSL or OpenSSL).
Stream Management with XEP-0198.
Stream Compression with XEP-0138.
DNS resolution via an internal implementation or c-ares.

Documentation

Older versions of the documentation can be found here