Generate GSMTAP messages from raw received DIAG frames
This forwards the raw DIAG messages via GSMTAP, so the receiver (e.g.
wireshark) will have to do a full DIAG protocol decode. I currently
prefer this idea to that of converting only the protocol payload to
"native" GSMTAP messages like GSMTAP_UM.
One of the problems is that the LAPDm headers are alrady stripped, and
we would have to re-add fake LAPDm headers to generate GSMTAP_UM. So
let's rather forward all information we have and let wireshark deal with
it.
I'm not entirely sure if this is the best strategy, but we can always
implement both modes and switch between them at runtime.
diff --git a/src/diag_io.c b/src/diag_io.c
index 9309774..46af445 100644
--- a/src/diag_io.c
+++ b/src/diag_io.c
@@ -23,6 +23,9 @@
#include <string.h>
#include <unistd.h>
+#include <osmocom/core/gsmtap.h>
+#include <osmocom/core/gsmtap_util.h>
+
#include "protocol/protocol.h"
#include "diag_io.h"
#include "diag_cmd.h"
@@ -45,6 +48,11 @@
struct diag_send_desc_type send;
struct diag_hdlc_dest_type enc = { NULL, NULL, 0 };
+ if (di->flags & DIAG_INST_F_GSMTAP_DIAG && di->gsmtap) {
+ gsmtap_send_ex(di->gsmtap, GSMTAP_TYPE_QC_DIAG, 0, 0, 0,
+ 0, 0, 0, 0, msgb_l2(msg), msgb_l2len(msg));
+ }
+
if (di->flags & DIAG_INST_F_HEXDUMP)
printf("Tx: %s\n", msgb_hexdump(msg));
@@ -146,6 +154,13 @@
if (di->flags & DIAG_INST_F_HEXDUMP)
printf("Rx: %s\n", msgb_hexdump(msg));
+ if (di->flags & DIAG_INST_F_GSMTAP_DIAG && di->gsmtap) {
+ gsmtap_send_ex(di->gsmtap, GSMTAP_TYPE_QC_DIAG,
+ GSMTAP_ARFCN_F_UPLINK, 0, 0, 0,
+ 0, 0, 0, msgb_l2(msg),
+ msgb_l2len(msg));
+ }
+
return msg;
}
diff --git a/src/diag_io.h b/src/diag_io.h
index 1e6d662..d3fd64e 100644
--- a/src/diag_io.h
+++ b/src/diag_io.h
@@ -5,6 +5,7 @@
#include <osmocom/core/gsmtap_util.h>
#define DIAG_INST_F_HEXDUMP 0x00000001
+#define DIAG_INST_F_GSMTAP_DIAG 0x00000002
struct diag_instance {
int fd;
diff --git a/src/osmo-qcdiag-log.c b/src/osmo-qcdiag-log.c
index 8905576..33b26ba 100644
--- a/src/osmo-qcdiag-log.c
+++ b/src/osmo-qcdiag-log.c
@@ -160,6 +160,7 @@
return EXIT_FAILURE;
di.gsmtap = gsmtap_source_init("localhost", GSMTAP_UDP_PORT, 0);
+ di.flags = DIAG_INST_F_GSMTAP_DIAG;
gsmtap_source_add_sink(di.gsmtap);
printf("\n===> CONFIGURING\n");