commit 05fae9597a560dd64686c03b88bcdffb3efce242 Author: Vinod Yegneswaran vinod@csl.sri.com Date: Wed Jan 11 01:26:14 2012 +0000

updated dummy steg module

git-svn-id: svn+ssh://spartan.csl.sri.com/svn/private/DEFIANCE@213 a58ff0ac-194c-e011-a152-003048836090 --- src/steg/dummy.cc | 42 +++++++++++++++++++++++++++++++----------- 1 files changed, 31 insertions(+), 11 deletions(-)

diff --git a/src/steg/dummy.cc b/src/steg/dummy.cc index 230dbab..5823a69 100644 --- a/src/steg/dummy.cc +++ b/src/steg/dummy.cc @@ -44,6 +44,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. namespace { struct dummy : steg_t { + bool have_transmitted : 1; + bool have_received : 1; STEG_DECLARE_METHODS(dummy); }; } @@ -56,6 +58,7 @@ STEG_DEFINE_MODULE(dummy,

dummy::dummy(bool is_clientside) + : have_transmitted(false), have_received(false) { this->is_clientside = is_clientside; } @@ -69,21 +72,16 @@ dummy::~dummy() bool dummy::detect(conn_t *conn) { - struct config_t* cfg = conn->cfg; - struct evutil_addrinfo *addrs = cfg->get_listen_addrs(0); - - + struct evutil_addrinfo *addrs = conn->cfg->get_listen_addrs(0); if (!addrs) { - log_warn("no listen addrs\n"); + log_debug("no listen addrs\n"); return 0; }

struct sockaddr_in* sin = (struct sockaddr_in*) addrs->ai_addr;

- if (sin->sin_port == htons(DUMMY_PORT)) { - + if (sin->sin_port == htons(DUMMY_PORT)) return 1; - }

return 0;

@@ -92,7 +90,17 @@ dummy::detect(conn_t *conn) size_t dummy::transmit_room(conn_t *) { - return 1024; + + if (have_transmitted) + return 0; + + if (is_clientside) + return SIZE_MAX; + + if (!have_received) + return 0; + + return SIZE_MAX; }

@@ -106,12 +114,17 @@ dummy::transmit(struct evbuffer *source, conn_t *conn) { struct evbuffer *dest = conn_get_outbound(conn);

- // fprintf(stderr, "transmitting %d\n", (int) evbuffer_get_length(source)); + fprintf(stderr, "transmitting %d\n", (int) evbuffer_get_length(source));; +

if (evbuffer_add_buffer(dest, source)) { fprintf(stderr, "failed to transfer buffer\n"); } + +

+ conn_cease_transmission(conn); + this->have_transmitted = 1; return 0;

} @@ -126,11 +139,18 @@ dummy::receive(conn_t *conn, struct evbuffer *dest) { struct evbuffer *source = conn_get_inbound(conn);

- // fprintf(stderr, "receiving %d\n", (int) evbuffer_get_length(source)); + + fprintf(stderr, "receiving %d\n", (int) evbuffer_get_length(source));

if (evbuffer_add_buffer(dest, source)) { fprintf(stderr, "failed to transfer buffer\n"); }

+ + + + + this->have_received = 1; + conn_transmit_soon(conn, 100); return 0; }