sd-network: add new library

This is similar to sd-login, but exposes the state of networkd rather than logind.

Include it in libsystemd-dhcp and rename it to libsystemd-network.

1 files changed, 496 insertions, 0 deletions

diff --git a/src/libsystemd-network/test-dhcp-client.c b/src/libsystemd-network/test-dhcp-client.c
new file mode 100644
index 0000000000..8061e5fa83
--- /dev/null
+++ b/src/libsystemd-network/test-dhcp-client.c
@@ -0,0 +1,496 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright (C) 2013 Intel Corporation. All rights reserved.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "util.h"
+#include "socket-util.h"
+
+#include "dhcp-protocol.h"
+#include "dhcp-internal.h"
+#include "sd-dhcp-client.h"
+
+static struct ether_addr mac_addr = {
+        .ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}
+};
+
+typedef int (*test_callback_recv_t)(size_t size, DHCPMessage *dhcp);
+
+static bool verbose = false;
+static int test_fd[2];
+static test_callback_recv_t callback_recv;
+static be32_t xid;
+
+static void test_request_basic(sd_event *e)
+{
+        int r;
+
+        sd_dhcp_client *client;
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        r = sd_dhcp_client_new(&client);
+
+        assert_se(r >= 0);
+        assert_se(client);
+
+        r = sd_dhcp_client_attach_event(client, e, 0);
+        assert_se(r >= 0);
+
+        assert_se(sd_dhcp_client_set_request_option(NULL, 0) == -EINVAL);
+        assert_se(sd_dhcp_client_set_request_address(NULL, NULL) == -EINVAL);
+        assert_se(sd_dhcp_client_set_index(NULL, 0) == -EINVAL);
+
+        assert_se(sd_dhcp_client_set_index(client, 15) == 0);
+        assert_se(sd_dhcp_client_set_index(client, -42) == -EINVAL);
+        assert_se(sd_dhcp_client_set_index(client, -1) == 0);
+
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_SUBNET_MASK) == -EEXIST);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_ROUTER) == -EEXIST);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_HOST_NAME) == -EEXIST);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_DOMAIN_NAME) == -EEXIST);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_DOMAIN_NAME_SERVER)
+                        == -EEXIST);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_NTP_SERVER) == -EEXIST);
+
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_PAD) == -EINVAL);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_END) == -EINVAL);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_MESSAGE_TYPE) == -EINVAL);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_OVERLOAD) == -EINVAL);
+        assert_se(sd_dhcp_client_set_request_option(client,
+                                        DHCP_OPTION_PARAMETER_REQUEST_LIST)
+                        == -EINVAL);
+
+        assert_se(sd_dhcp_client_set_request_option(client, 33) == 0);
+        assert_se(sd_dhcp_client_set_request_option(client, 33) == -EEXIST);
+        assert_se(sd_dhcp_client_set_request_option(client, 44) == 0);
+        assert_se(sd_dhcp_client_set_request_option(client, 33) == -EEXIST);
+}
+
+static uint16_t client_checksum(void *buf, int len)
+{
+        uint32_t sum;
+        uint16_t *check;
+        int i;
+        uint8_t *odd;
+
+        sum = 0;
+        check = buf;
+
+        for (i = 0; i < len / 2 ; i++)
+                sum += check[i];
+
+        if (len & 0x01) {
+                odd = buf;
+                sum += odd[len - 1];
+        }
+
+        while (sum >> 16)
+                sum = (sum & 0xffff) + (sum >> 16);
+
+        return ~sum;
+}
+
+static void test_checksum(void)
+{
+        uint8_t buf[20] = {
+                0x45, 0x00, 0x02, 0x40, 0x00, 0x00, 0x00, 0x00,
+                0x40, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0xff, 0xff, 0xff, 0xff
+        };
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        assert_se(client_checksum(&buf, 20) == be16toh(0x78ae));
+}
+
+static int check_options(uint8_t code, uint8_t len, const uint8_t *option,
+                void *user_data)
+{
+        return 0;
+}
+
+int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
+                                 const void *packet, size_t len)
+{
+        size_t size;
+        _cleanup_free_ DHCPPacket *discover;
+        uint16_t ip_check, udp_check;
+
+        assert_se(s >= 0);
+        assert_se(packet);
+
+        size = sizeof(DHCPPacket) + 4;
+        assert_se(len > size);
+
+        discover = memdup(packet, len);
+
+        assert_se(discover->ip.ttl == IPDEFTTL);
+        assert_se(discover->ip.protocol == IPPROTO_UDP);
+        assert_se(discover->ip.saddr == INADDR_ANY);
+        assert_se(discover->ip.daddr == INADDR_BROADCAST);
+        assert_se(discover->udp.source == be16toh(DHCP_PORT_CLIENT));
+        assert_se(discover->udp.dest == be16toh(DHCP_PORT_SERVER));
+
+        ip_check = discover->ip.check;
+
+        discover->ip.ttl = 0;
+        discover->ip.check = discover->udp.len;
+
+        udp_check = ~client_checksum(&discover->ip.ttl, len - 8);
+        assert_se(udp_check == 0xffff);
+
+        discover->ip.ttl = IPDEFTTL;
+        discover->ip.check = ip_check;
+
+        ip_check = ~client_checksum(&discover->ip, sizeof(discover->ip));
+        assert_se(ip_check == 0xffff);
+
+        assert_se(discover->dhcp.xid);
+        assert_se(memcmp(discover->dhcp.chaddr,
+                      &mac_addr.ether_addr_octet, 6) == 0);
+
+        size = len - sizeof(struct iphdr) - sizeof(struct udphdr);
+
+        assert_se(callback_recv);
+        callback_recv(size, &discover->dhcp);
+
+        return 575;
+}
+
+int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link)
+{
+        if (socketpair(AF_UNIX, SOCK_STREAM, 0, test_fd) < 0)
+                return -errno;
+
+        return test_fd[0];
+}
+
+int dhcp_network_bind_udp_socket(int index, be32_t address, uint16_t port)
+{
+        return 0;
+}
+
+int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
+                                 const void *packet, size_t len)
+{
+        return 0;
+}
+
+static int test_discover_message_verify(size_t size, struct DHCPMessage *dhcp)
+{
+        int res;
+
+        res = dhcp_option_parse(dhcp, size, check_options, NULL);
+        assert_se(res == DHCP_DISCOVER);
+
+        if (verbose)
+                printf("  recv DHCP Discover 0x%08x\n", be32toh(dhcp->xid));
+
+        return 0;
+}
+
+static void test_discover_message(sd_event *e)
+{
+        sd_dhcp_client *client;
+        int res, r;
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        r = sd_dhcp_client_new(&client);
+        assert_se(r >= 0);
+        assert_se(client);
+
+        r = sd_dhcp_client_attach_event(client, e, 0);
+        assert_se(r >= 0);
+
+        assert_se(sd_dhcp_client_set_index(client, 42) >= 0);
+        assert_se(sd_dhcp_client_set_mac(client, &mac_addr) >= 0);
+
+        assert_se(sd_dhcp_client_set_request_option(client, 248) >= 0);
+
+        callback_recv = test_discover_message_verify;
+
+        res = sd_dhcp_client_start(client);
+
+        assert_se(res == 0 || res == -EINPROGRESS);
+
+        sd_event_run(e, (uint64_t) -1);
+
+        sd_dhcp_client_stop(client);
+        sd_dhcp_client_free(client);
+
+        close(test_fd[0]);
+        close(test_fd[1]);
+
+        callback_recv = NULL;
+}
+
+static uint8_t test_addr_acq_offer[] = {
+        0x45, 0x10, 0x01, 0x48, 0x00, 0x00, 0x00, 0x00,
+        0x80, 0x11, 0xb3, 0x84, 0xc0, 0xa8, 0x02, 0x01,
+        0xc0, 0xa8, 0x02, 0xbf, 0x00, 0x43, 0x00, 0x44,
+        0x01, 0x34, 0x00, 0x00, 0x02, 0x01, 0x06, 0x00,
+        0x6f, 0x95, 0x2f, 0x30, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0xc0, 0xa8, 0x02, 0xbf,
+        0xc0, 0xa8, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        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, 0x02, 0x01, 0x33, 0x04, 0x00,
+        0x00, 0x02, 0x58, 0x01, 0x04, 0xff, 0xff, 0xff,
+        0x00, 0x2a, 0x04, 0xc0, 0xa8, 0x02, 0x01, 0x0f,
+        0x09, 0x6c, 0x61, 0x62, 0x2e, 0x69, 0x6e, 0x74,
+        0x72, 0x61, 0x03, 0x04, 0xc0, 0xa8, 0x02, 0x01,
+        0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static uint8_t test_addr_acq_ack[] = {
+        0x45, 0x10, 0x01, 0x48, 0x00, 0x00, 0x00, 0x00,
+        0x80, 0x11, 0xb3, 0x84, 0xc0, 0xa8, 0x02, 0x01,
+        0xc0, 0xa8, 0x02, 0xbf, 0x00, 0x43, 0x00, 0x44,
+        0x01, 0x34, 0x00, 0x00, 0x02, 0x01, 0x06, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0xc0, 0xa8, 0x02, 0xbf,
+        0xc0, 0xa8, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        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, 0x02, 0x01, 0x33, 0x04, 0x00,
+        0x00, 0x02, 0x58, 0x01, 0x04,   0xff, 0xff, 0xff,
+        0x00, 0x2a, 0x04, 0xc0, 0xa8, 0x02, 0x01, 0x0f,
+        0x09, 0x6c, 0x61, 0x62, 0x2e, 0x69, 0x6e, 0x74,
+        0x72, 0x61, 0x03, 0x04, 0xc0, 0xa8, 0x02, 0x01,
+        0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static void test_addr_acq_acquired(sd_dhcp_client *client, int event,
+                                   void *userdata)
+{
+        sd_event *e = userdata;
+        sd_dhcp_lease *lease;
+        struct in_addr addr;
+
+        assert_se(client);
+        assert_se(event == DHCP_EVENT_IP_ACQUIRE);
+
+        assert_se(sd_dhcp_client_get_lease(client, &lease) >= 0);
+        assert_se(lease);
+
+        assert_se(sd_dhcp_lease_get_address(lease, &addr) >= 0);
+        assert_se(memcmp(&addr.s_addr, &test_addr_acq_ack[44],
+                      sizeof(addr.s_addr)) == 0);
+
+        assert_se(sd_dhcp_lease_get_netmask(lease, &addr) >= 0);
+        assert_se(memcmp(&addr.s_addr, &test_addr_acq_ack[285],
+                      sizeof(addr.s_addr)) == 0);
+
+        assert_se(sd_dhcp_lease_get_router(lease, &addr) >= 0);
+        assert_se(memcmp(&addr.s_addr, &test_addr_acq_ack[308],
+                      sizeof(addr.s_addr)) == 0);
+
+        if (verbose)
+                printf("  DHCP address acquired\n");
+
+        sd_event_exit(e, 0);
+}
+
+static int test_addr_acq_recv_request(size_t size, DHCPMessage *request)
+{
+        uint16_t udp_check = 0;
+        int res;
+
+        res = dhcp_option_parse(request, size, check_options, NULL);
+        assert_se(res == DHCP_REQUEST);
+        assert_se(xid == request->xid);
+
+        if (verbose)
+                printf("  recv DHCP Request  0x%08x\n", be32toh(xid));
+
+        memcpy(&test_addr_acq_ack[26], &udp_check, sizeof(udp_check));
+        memcpy(&test_addr_acq_ack[32], &xid, sizeof(xid));
+        memcpy(&test_addr_acq_ack[56], &mac_addr.ether_addr_octet,
+               ETHER_ADDR_LEN);
+
+        callback_recv = NULL;
+
+        res = write(test_fd[1], test_addr_acq_ack,
+                    sizeof(test_addr_acq_ack));
+        assert_se(res == sizeof(test_addr_acq_ack));
+
+        if (verbose)
+                printf("  send DHCP Ack\n");
+
+        return 0;
+};
+
+static int test_addr_acq_recv_discover(size_t size, DHCPMessage *discover)
+{
+        uint16_t udp_check = 0;
+        int res;
+
+        res = dhcp_option_parse(discover, size, check_options, NULL);
+        assert_se(res == DHCP_DISCOVER);
+
+        xid = discover->xid;
+
+        if (verbose)
+                printf("  recv DHCP Discover 0x%08x\n", be32toh(xid));
+
+        memcpy(&test_addr_acq_offer[26], &udp_check, sizeof(udp_check));
+        memcpy(&test_addr_acq_offer[32], &xid, sizeof(xid));
+        memcpy(&test_addr_acq_offer[56], &mac_addr.ether_addr_octet,
+               ETHER_ADDR_LEN);
+
+        callback_recv = test_addr_acq_recv_request;
+
+        res = write(test_fd[1], test_addr_acq_offer,
+                    sizeof(test_addr_acq_offer));
+        assert_se(res == sizeof(test_addr_acq_offer));
+
+        if (verbose)
+                printf("  send DHCP Offer\n");
+
+        return 0;
+}
+
+static void test_addr_acq(sd_event *e)
+{
+        sd_dhcp_client *client;
+        int res, r;
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        r = sd_dhcp_client_new(&client);
+        assert_se(r >= 0);
+        assert_se(client);
+
+        r = sd_dhcp_client_attach_event(client, e, 0);
+        assert_se(r >= 0);
+
+        assert_se(sd_dhcp_client_set_index(client, 42) >= 0);
+        assert_se(sd_dhcp_client_set_mac(client, &mac_addr) >= 0);
+
+        assert_se(sd_dhcp_client_set_callback(client, test_addr_acq_acquired, e)
+                >= 0);
+
+        callback_recv = test_addr_acq_recv_discover;
+
+        res = sd_dhcp_client_start(client);
+        assert_se(res == 0 || res == -EINPROGRESS);
+
+        sd_event_loop(e);
+
+        sd_dhcp_client_set_callback(client, NULL, NULL);
+        sd_dhcp_client_stop(client);
+        sd_dhcp_client_free(client);
+
+        close(test_fd[0]);
+        close(test_fd[1]);
+
+        callback_recv = NULL;
+        xid = 0;
+}
+
+int main(int argc, char *argv[])
+{
+        sd_event *e;
+
+        assert_se(sd_event_new(&e) >= 0);
+
+        test_request_basic(e);
+        test_checksum();
+
+        test_discover_message(e);
+        test_addr_acq(e);
+
+        return 0;
+}