From 2b5d3ce7c69e1149bb2af815ab8b8534026063ca Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@gnumonks.org>
Date: Sun, 6 Nov 2011 20:47:08 +0100
Subject: src: add generic channel infrastructure and A-bis IPA server support

This patch adds the generic channel infrastructure that allows to
create channel of different types. Each channel has their own
configuration functions.

  struct osmo_chan *chan;
  chan = osmo_chan_create(tall_example, CHAN_ABIS_IPA_SERVER);
  ...

  /* specific configuration functions per supported channel. */
  osmo_chan_abis_ipa_server_set_cb_signalmsg(chan, signal_msg_cb);
  osmo_chan_abis_ipa_unit_add(chan, 1801, 0);

  /* open channel. */
  osmo_chan_open(chan);

The input path requires a callback to be registered. The output path
is handled through:

  int osmo_chan_enqueue(struct osmo_chan *c, struct msgb *msg);

The msg->dst must be set (it can be taken from the original message
to route one reply).

This patch also adds A-bis IPA server support. It has been tested with
e1inp_ipa_bsc_test available in libosmo-abis.
---
 examples/Makefile.am               |  2 +
 examples/channel/Makefile.am       |  9 +++++
 examples/channel/abis_ipa_server.c | 76 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 examples/channel/Makefile.am
 create mode 100644 examples/channel/abis_ipa_server.c

(limited to 'examples')

diff --git a/examples/Makefile.am b/examples/Makefile.am
index be4ecde..173b620 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -2,6 +2,8 @@ INCLUDES = $(all_includes) -I$(top_srcdir)/include
 AM_CFLAGS=-Wall -g $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
 AM_LDFLAGS = $(COVERAGE_LDFLAGS)
 
+SUBDIRS = channel
+
 noinst_PROGRAMS = ipa-stream-client		\
 		  ipa-stream-server		\
 		  lapd-over-datagram-user	\
diff --git a/examples/channel/Makefile.am b/examples/channel/Makefile.am
new file mode 100644
index 0000000..1906465
--- /dev/null
+++ b/examples/channel/Makefile.am
@@ -0,0 +1,9 @@
+INCLUDES = $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS=-Wall -g $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
+AM_LDFLAGS = $(COVERAGE_LDFLAGS)
+
+noinst_PROGRAMS = abis_ipa_server
+
+abis_ipa_server_SOURCES = abis_ipa_server.c
+abis_ipa_server_LDADD = $(top_builddir)/src/libosmonetif.la 	\
+			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS)
diff --git a/examples/channel/abis_ipa_server.c b/examples/channel/abis_ipa_server.c
new file mode 100644
index 0000000..014975d
--- /dev/null
+++ b/examples/channel/abis_ipa_server.c
@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <osmocom/core/select.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/application.h>
+
+#include <osmocom/netif/channel.h>
+#include <osmocom/netif/channel/abis_ipa_server.h>
+
+static void *tall_example;
+
+#define DEXAMPLE 0
+
+struct log_info_cat example_cat[] = {
+	[DEXAMPLE] = {
+		.name = "DEXAMPLE",
+		.description = "example",
+		.color = "\033[1;35m",
+		.enabled = 1, .loglevel = LOGL_DEBUG,
+	},
+};
+
+const struct log_info example_log_info = {
+	.filter_fn = NULL,
+	.cat = example_cat,
+	.num_cat = ARRAY_SIZE(example_cat),
+};
+
+void sighandler(int foo)
+{
+	LOGP(DEXAMPLE, LOGL_NOTICE, "closing test.\n");
+	exit(EXIT_SUCCESS);
+}
+
+static void signal_msg_cb(struct msgb *msg, int type)
+{
+	LOGP(DEXAMPLE, LOGL_NOTICE, "received signal message\n");
+}
+
+static struct osmo_chan *chan;
+
+int main(void)
+{
+	tall_example = talloc_named_const(NULL, 1, "example");
+
+	osmo_init_logging(&example_log_info);
+	log_set_log_level(osmo_stderr_target, LOGL_DEBUG);
+
+	/* create channel. */
+	chan = osmo_chan_create(tall_example, CHAN_ABIS_IPA_SERVER);
+	if (chan == NULL) {
+		LOGP(DEXAMPLE, LOGL_ERROR, "Cannot create A-bis IPA server\n");
+		exit(EXIT_FAILURE);
+	}
+
+	/* set specific parameters (depends on channel type). */
+	osmo_chan_abis_ipa_server_set_cb_signalmsg(chan, signal_msg_cb);
+	osmo_chan_abis_ipa_unit_add(chan, 1801, 0);
+
+	/* open channel. */
+	if (osmo_chan_open(chan) < 0) {
+		LOGP(DEXAMPLE, LOGL_ERROR, "Cannot create A-bis IPA server\n");
+		exit(EXIT_FAILURE);
+	}
+
+	LOGP(DEXAMPLE, LOGL_NOTICE, "Entering main loop\n");
+
+	while(1) {
+		osmo_select_main(0);
+	}
+}
-- 
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