Refactor tls code to support ucspi-tls

 That includes:
 - new architecture: the tls binary is now a child of the app
instead of the other way around
 - the sbearssl_run engine now takes a post-handshake callback.
This allows s6-tlsc and s6-tlsd to only exec into the app when
the handshake succeeds (which was already the case with libressl).
 - new binaries s6-tlsc-io and s6-tlsd-io encapsulate the crypto
code; they init and run the engine, connecting to 4 already open
fds (stdin/stdout = network, argv[1] and argv[2] = local)
 - s6-tlsc is now a simple wrapper around s6-tlsc-io
 - s6-tlsd is now a simple wrapper around s6-tlsd-io
 - new binary: s6-ucspitlsd, which is also a wrapper around
s6-tlsd-io, but differently: the parent execs the app which should
be ucspi-tls-aware, the child waits for a command from the parent
and execs into s6-tlsd-io if it receives it.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/conn-tools/s6tls-internal.h b/src/conn-tools/s6tls-internal.h
new file mode 100644
index 0000000..48df60f
--- /dev/null
+++ b/src/conn-tools/s6tls-internal.h
@@ -0,0 +1,18 @@
+/* ISC license */
+
+#ifndef S6TLS_INTERNAL_H
+#define S6TLS_INTERNAL_H
+
+#include <stdint.h>
+#include <unistd.h>
+
+#include <skalibs/gccattributes.h>
+
+#define s6tls_envvars "CADIR\0CAFILE\0KEYFILE\0CERTFILE\0TLS_UID\0TLS_GID"
+
+extern void s6tls_drop (void) ;
+extern void s6tls_exec_tlscio (int const *, uint32_t, unsigned int, unsigned int, char const *) gccattr_noreturn ;
+extern void s6tls_exec_tlsdio (int const *, uint32_t, unsigned int, unsigned int) gccattr_noreturn ;
+extern void s6tls_wait_and_exec_app (char const *const *, int const [3][2], pid_t, int, int, uint32_t) gccattr_noreturn ;
+
+#endif