libdhcp: Add a basic smoke-test

4 files changed, 150 insertions, 0 deletions

diff --git a/libdhcp/CMakeLists.txt b/libdhcp/CMakeLists.txt
index 69ad470..f14e46d 100644
--- a/libdhcp/CMakeLists.txt
+++ b/libdhcp/CMakeLists.txt
@@ -11,4 +11,10 @@ target_sources(libdhcp INTERFACE
 )
 target_link_libraries(libdhcp INTERFACE
 	libmisc
+	libhw_generic
 )
+
+if (ENABLE_TESTS)
+	add_lib_test(libdhcp test_client)
+	target_link_libraries(test_client libcr libhw_cr)
+endif()
diff --git a/libdhcp/tests/config.h b/libdhcp/tests/config.h
new file mode 100644
index 0000000..53079fe
--- /dev/null
+++ b/libdhcp/tests/config.h
@@ -0,0 +1,25 @@
+/* config.h - Compile-time configuration for the libdhcp tests
+ *
+ * Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+#define CONFIG_COROUTINE_STACK_SIZE_DEFAULT    (16*1024)
+#define CONFIG_COROUTINE_NAME_LEN              16
+#define CONFIG_COROUTINE_NUM                   16
+
+#define CONFIG_COROUTINE_MEASURE_STACK         1
+#define CONFIG_COROUTINE_PROTECT_STACK         1
+#define CONFIG_COROUTINE_DEBUG                 1
+#define CONFIG_COROUTINE_VALGRIND              1
+#define CONFIG_COROUTINE_GDB                   1
+
+#define CONFIG_DHCP_CAN_RECV_UNICAST_IP_WITHOUT_IP      0 /* bool */
+#define CONFIG_DHCP_DEBUG                               1 /* bool */
+#define CONFIG_DHCP_OPT_SIZE                            312 /* minimum of 312 */
+#define CONFIG_DHCP_SELECTING_NS                        (5*NS_PER_S)
+
+#endif /* _CONFIG_H_ */
diff --git a/libdhcp/tests/test.h b/libdhcp/tests/test.h
new file mode 120000
index 0000000..2fb1bd5
--- /dev/null
+++ b/libdhcp/tests/test.h
@@ -0,0 +1 @@
+../../libmisc/tests/test.h
\ No newline at end of file
diff --git a/libdhcp/tests/test_client.c b/libdhcp/tests/test_client.c
new file mode 100644
index 0000000..90efd01
--- /dev/null
+++ b/libdhcp/tests/test_client.c
@@ -0,0 +1,118 @@
+/* libdhcp/tests/test_client.c - Tests for libdhcp client
+ *
+ * Copyright (C) 2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#include <string.h> /* for memcpy() */
+
+#include <libcr/coroutine.h>
+#include <libhw/generic/net.h>
+#include <libhw/host_alarmclock.h>
+
+#include <libdhcp/client.h>
+
+#include "test.h"
+
+/******************************************************************************/
+
+struct test_udp {
+};
+LO_IMPLEMENTATION_H(io_closer, struct test_udp, test_udp);
+LO_IMPLEMENTATION_C(io_closer, struct test_udp, test_udp, static);
+LO_IMPLEMENTATION_H(net_packet_conn, struct test_udp, test_udp);
+LO_IMPLEMENTATION_C(net_packet_conn, struct test_udp, test_udp, static);
+
+static ssize_t test_udp_sendto(struct test_udp *LM_UNUSED(self), void *LM_UNUSED(buf), size_t len, struct net_ip4_addr LM_UNUSED(node), uint16_t LM_UNUSED(port)) {
+	return len;
+}
+
+static ssize_t test_udp_recvfrom(struct test_udp *LM_UNUSED(self), void *buf, size_t len, struct net_ip4_addr *ret_node, uint16_t *ret_port) {
+	static const uint8_t resp_offer[] = {0x02,0x01,0x06,0x00,0xE8,0x40,0xC6,0x79,0x00,0x01,0x80,0x00,0x00,0x00,0x00,0x00,0xC0,0xA8,0x0A,0x78,0xC0,0xA8,0x0A,0x01,0x00,0x00,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x63,0x82,0x53,0x63,0x35,0x01,0x02,0x36,0x04,0xC0,0xA8,0x0A,0x01,0x33,0x04,0x00,0x00,0xA8,0xC0,0x3A,0x04,0x00,0x00,0x54,0x60,0x3B,0x04,0x00,0x00,0x93,0xA8,0x01,0x04,0xFF,0xFF,0xFF,0x00,0x1C,0x04,0xC0,0xA8,0x0A,0xFF,0x03,0x04,0xC0,0xA8,0x0A,0x01,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	static const uint8_t resp_ack[]   = {0x02,0x01,0x06,0x00,0xE8,0x40,0xC6,0x79,0x00,0x01,0x80,0x00,0x00,0x00,0x00,0x00,0xC0,0xA8,0x0A,0x78,0xC0,0xA8,0x0A,0x01,0x00,0x00,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x63,0x82,0x53,0x63,0x35,0x01,0x05,0x36,0x04,0xC0,0xA8,0x0A,0x01,0x33,0x04,0x00,0x00,0xA8,0xC0,0x3A,0x04,0x00,0x00,0x54,0x60,0x3B,0x04,0x00,0x00,0x93,0xA8,0x01,0x04,0xFF,0xFF,0xFF,0x00,0x1C,0x04,0xC0,0xA8,0x0A,0xFF,0x03,0x04,0xC0,0xA8,0x0A,0x01,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+
+	static unsigned cnt = 0;
+	const void *resp;
+	size_t resp_len;
+	switch (cnt++) {
+	case 0: resp = resp_offer; resp_len = sizeof(resp_offer); break;
+	case 1: resp = resp_ack; resp_len = sizeof(resp_ack); break;
+	default: return -NET_ERECV_TIMEOUT;
+	}
+	test_assert(len >= resp_len);
+	memcpy(buf, resp, resp_len);
+	*ret_node = ((struct net_ip4_addr){{192,168,10,1}});
+	*ret_port = 67;
+	return resp_len;
+}
+
+static void test_udp_set_recv_deadline(struct test_udp *LM_UNUSED(self), uint64_t LM_UNUSED(ns_since_boot)) {
+	/* Do nothing?  */
+}
+
+static int test_udp_close(struct test_udp *LM_UNUSED(self)) {
+	assert_notreached("not implemented");
+}
+
+/******************************************************************************/
+
+struct test_iface {
+	struct net_iface_config cfg;
+
+	struct test_udp         conn;
+};
+LO_IMPLEMENTATION_H(net_iface, struct test_iface, test);
+LO_IMPLEMENTATION_C(net_iface, struct test_iface, test, static);
+
+static struct net_eth_addr test_hwaddr(struct test_iface *LM_UNUSED(self)) {
+	struct net_eth_addr ret = {{1, 2, 3, 4, 5, 6}};
+	return ret;
+}
+
+static void test_ifup(struct test_iface *LM_UNUSED(self), struct net_iface_config LM_UNUSED(cfg)) {
+	cr_exit();
+}
+
+static void test_ifdown(struct test_iface *LM_UNUSED(self)) {
+	assert_notreached("not implemented");
+}
+
+static bool test_arp_ping(struct test_iface *LM_UNUSED(self), struct net_ip4_addr LM_UNUSED(addr)) {
+	return false;
+}
+
+static lo_interface net_stream_listener test_tcp_listen(struct test_iface *LM_UNUSED(self), uint16_t LM_UNUSED(local_port)) {
+	assert_notreached("not implemented");
+}
+
+static lo_interface net_stream_conn test_tcp_dial(struct test_iface *LM_UNUSED(self), struct net_ip4_addr LM_UNUSED(remote_node), uint16_t LM_UNUSED(remote_port)) {
+	assert_notreached("not implemented");
+}
+
+static lo_interface net_packet_conn test_udp_conn(struct test_iface *self, uint16_t local_port) {
+	bool once = false;
+	test_assert(local_port == 68);
+	test_assert(!once);
+	once = true;
+	return lo_box_test_udp_as_net_packet_conn(&self->conn);
+}
+
+/******************************************************************************/
+
+COROUTINE dhcp_cr(void *) {
+	cr_begin();
+	struct test_iface iface = {};
+	dhcp_client_main(lo_box_test_as_net_iface(&iface), "test-client");
+	cr_end();
+}
+
+int main() {
+	struct hostclock clock_monotonic = {
+		.clock_id = CLOCK_MONOTONIC,
+	};
+	bootclock = lo_box_hostclock_as_alarmclock(&clock_monotonic);
+
+	coroutine_add("dhcp", dhcp_cr, NULL);
+	coroutine_main();
+	return 0;
+}