s_client/s_server: support unix domain sockets
The "-unix <path>" argument allows s_server and s_client to use a unix
domain socket in the filesystem instead of IPv4 ("-connect", "-port",
"-accept", etc). If s_server exits gracefully, such as when "-naccept"
is used and the requested number of SSL/TLS connections have occurred,
then the domain socket file is removed. On ctrl-C, it is likely that
the stale socket file will be left over, such that s_server would
normally fail to restart with the same arguments. For this reason,
s_server also supports an "-unlink" option, which will clean up any
stale socket file before starting.
If you have any reason to want encrypted IPC within an O/S instance,
this concept might come in handy. Otherwise it just demonstrates that
there is nothing about SSL/TLS that limits it to TCP/IP in any way.
(There might also be benchmarking and profiling use in this path, as
unix domain sockets are much lower overhead than connecting over local
IP addresses).
Signed-off-by: Geoff Thorpe <geoff@openssl.org>
diff --git a/apps/s_server.c b/apps/s_server.c
index 05ffc35..7c4f7bc 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -479,7 +479,9 @@
{
BIO_printf(bio_err,"usage: s_server [args ...]\n");
BIO_printf(bio_err,"\n");
- BIO_printf(bio_err," -accept arg - port to accept on (default is %d)\n",PORT);
+ BIO_printf(bio_err," -accept port - TCP/IP port to accept on (default is %d)\n",PORT);
+ BIO_printf(bio_err," -unix path - unix domain socket to accept on\n");
+ BIO_printf(bio_err," -unlink - for -unix, unlink existing socket first\n");
BIO_printf(bio_err," -context arg - set session ID context\n");
BIO_printf(bio_err," -verify arg - turn on peer certificate verification\n");
BIO_printf(bio_err," -Verify arg - turn on peer certificate verification, must have a cert.\n");
@@ -1008,6 +1010,9 @@
X509_VERIFY_PARAM *vpm = NULL;
int badarg = 0;
short port=PORT;
+ const char *unix_path=NULL;
+ int unlink_unix_path=0;
+ int (*server_cb)(char *hostname, int s, int stype, unsigned char *context);
char *CApath=NULL,*CAfile=NULL;
char *chCApath=NULL,*chCAfile=NULL;
char *vfyCApath=NULL,*vfyCAfile=NULL;
@@ -1100,6 +1105,25 @@
if (!extract_port(*(++argv),&port))
goto bad;
}
+ else if (strcmp(*argv,"-unix") == 0)
+ {
+#ifdef NO_SYS_UN_H
+ BIO_printf(bio_err, "unix domain sockets unsupported\n");
+ goto bad;
+#else
+ if (--argc < 1) goto bad;
+ unix_path = *(++argv);
+#endif
+ }
+ else if (strcmp(*argv,"-unlink") == 0)
+ {
+#ifdef NO_SYS_UN_H
+ BIO_printf(bio_err, "unix domain sockets unsupported\n");
+ goto bad;
+#else
+ unlink_unix_path = 1;
+#endif
+ }
else if (strcmp(*argv,"-naccept") == 0)
{
if (--argc < 1) goto bad;
@@ -1544,6 +1568,11 @@
goto end;
}
+ if (unix_path && (socket_type != SOCK_STREAM))
+ {
+ BIO_printf(bio_err, "Can't use unix sockets and datagrams together\n");
+ goto end;
+ }
#if !defined(OPENSSL_NO_JPAKE) && !defined(OPENSSL_NO_PSK)
if (jpake_secret)
{
@@ -2106,11 +2135,19 @@
BIO_printf(bio_s_out,"ACCEPT\n");
(void)BIO_flush(bio_s_out);
if (rev)
- do_server(port,socket_type,&accept_socket,rev_body, context, naccept);
+ server_cb = rev_body;
else if (www)
- do_server(port,socket_type,&accept_socket,www_body, context, naccept);
+ server_cb = www_body;
else
- do_server(port,socket_type,&accept_socket,sv_body, context, naccept);
+ server_cb = sv_body;
+ if (unix_path)
+ {
+ if (unlink_unix_path)
+ unlink(unix_path);
+ do_server_unix(unix_path,&accept_socket,server_cb, context, naccept);
+ }
+ else
+ do_server(port,socket_type,&accept_socket,server_cb, context, naccept);
print_stats(bio_s_out,ctx);
ret=0;
end:
