From 1bfcbaf5dd86a343c15002d50e39fa074afe40e0 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Sat, 1 Nov 2014 14:24:00 +0100
Subject: [PATCH] Add argument validation to the channels API.

---
 src/meshlink.c | 41 ++++++++++++++++++++++++++++++++++++++---
 src/utcp       |  2 +-
 2 files changed, 39 insertions(+), 4 deletions(-)

diff --git a/src/meshlink.c b/src/meshlink.c
index 82666332..8f0ae7d2 100644
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -1964,6 +1964,11 @@ static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
 }
 
 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
+	if(!mesh || !channel) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return;
+	}
+
 	channel->receive_cb = cb;
 }
 
@@ -1993,6 +1998,11 @@ void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *c
 }
 
 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
+	if(!mesh) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return;
+	}
+
 	pthread_mutex_lock(&mesh->mesh_mutex);
 	mesh->channel_accept_cb = cb;
 	mesh->receive_cb = channel_receive;
@@ -2005,10 +2015,12 @@ void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_ac
 	pthread_mutex_unlock(&mesh->mesh_mutex);
 }
 
-void meshlink_channel_init(meshlink_handle_t *mesh) {
-}
-
 meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len) {
+	if(!mesh || !node) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return NULL;
+	}
+
 	logger(mesh, MESHLINK_WARNING, "meshlink_channel_open(%p, %s, %u, %p, %p, %zu)\n", mesh, node->name, port, cb, data, len);
 	node_t *n = (node_t *)node;
 	if(!n->utcp) {
@@ -2032,15 +2044,38 @@ meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node
 }
 
 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
+	if(!mesh || !channel) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return;
+	}
+
 	utcp_shutdown(channel->c, direction);
 }
 
 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
+	if(!mesh || !channel) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return;
+	}
+
 	utcp_close(channel->c);
 	free(channel);
 }
 
 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
+	if(!mesh || !channel) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return -1;
+	}
+
+	if(!len)
+		return 0;
+
+	if(!data) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return -1;
+	}
+
 	// TODO: locking.
 	// Ideally we want to put the data into the UTCP connection's send buffer.
 	// Then, preferrably only if there is room in the receiver window,
diff --git a/src/utcp b/src/utcp
index 52eeda5e..8d8944f2 160000
--- a/src/utcp
+++ b/src/utcp
@@ -1 +1 @@
-Subproject commit 52eeda5e47e8a081cd2f94b78536c6376592a526
+Subproject commit 8d8944f2e16b8d11e54cb79e1d45023e84aed37f
-- 
2.39.2