libnetworkd: add link local tests

- Also only allow positive ifindex on both dhcp and ipv4ll

[tomegun: the kernel always sets a positive ifindex, but some APIs accept
          ifindex=0 with various meanings, so we should protect against
          accidentally passing ifindex=0 along.]

4 files changed, 234 insertions, 4 deletions

diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 854c6711a8..14f226793c 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -143,7 +143,7 @@ int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) {
         assert_return(client, -EINVAL);
         assert_return (IN_SET(client->state, DHCP_STATE_INIT,
                               DHCP_STATE_STOPPED), -EBUSY);
-        assert_return(interface_index >= -1, -EINVAL);
+        assert_return(interface_index > 0, -EINVAL);
 
         client->index = interface_index;
 
diff --git a/src/libsystemd-network/sd-ipv4ll.c b/src/libsystemd-network/sd-ipv4ll.c
index 72289b2baf..fd39c12eb2 100644
--- a/src/libsystemd-network/sd-ipv4ll.c
+++ b/src/libsystemd-network/sd-ipv4ll.c
@@ -382,7 +382,7 @@ static int ipv4ll_receive_message(sd_event_source *s, int fd,
 
 int sd_ipv4ll_set_index(sd_ipv4ll *ll, int interface_index) {
         assert_return(ll, -EINVAL);
-        assert_return(interface_index >= -1, -EINVAL);
+        assert_return(interface_index > 0, -EINVAL);
         assert_return(IN_SET(ll->state, IPV4LL_STATE_INIT,
                              IPV4LL_STATE_STOPPED), -EBUSY);
 
@@ -469,10 +469,13 @@ int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address){
 }
 
 int sd_ipv4ll_set_address_seed (sd_ipv4ll *ll, uint8_t seed[8]) {
-        unsigned int entropy = *seed;
+        unsigned int entropy;
         int r;
 
         assert_return(ll, -EINVAL);
+        assert_return(seed, -EINVAL);
+
+        entropy = *seed;
 
         free(ll->random_data);
         free(ll->random_data_state);
diff --git a/src/libsystemd-network/test-dhcp-client.c b/src/libsystemd-network/test-dhcp-client.c
index e7787fa0f1..83dd619407 100644
--- a/src/libsystemd-network/test-dhcp-client.c
+++ b/src/libsystemd-network/test-dhcp-client.c
@@ -79,7 +79,9 @@ static void test_request_basic(sd_event *e)
 
         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_index(client, -1) == -EINVAL);
+        assert_se(sd_dhcp_client_set_index(client, 0) == -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);
diff --git a/src/libsystemd-network/test-ipv4ll.c b/src/libsystemd-network/test-ipv4ll.c
new file mode 100644
index 0000000000..459d5c324d
--- /dev/null
+++ b/src/libsystemd-network/test-ipv4ll.c
@@ -0,0 +1,225 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+/***
+  This file is part of systemd.
+
+  Copyright (C) 2014 Axis Communications AB. 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 "sd-ipv4ll.h"
+#include "ipv4ll-internal.h"
+
+static bool verbose = false;
+static bool extended = false;
+static int test_fd[2];
+
+static int basic_request_handler_bind = 0;
+static int basic_request_handler_stop = 0;
+static void* basic_request_handler_user_data = (void*)0xCABCAB;
+static void basic_request_handler(sd_ipv4ll *ll, int event, void *userdata) {
+        assert_se(userdata == basic_request_handler_user_data);
+
+        switch(event) {
+                case IPV4LL_EVENT_STOP:
+                        basic_request_handler_stop = 1;
+                        break;
+                case IPV4LL_EVENT_BIND:
+                        basic_request_handler_bind = 1;
+                        break;
+                default:
+                        assert_se(0);
+                        break;
+        }
+}
+
+int arp_network_send_raw_socket(int fd, const union sockaddr_union *link,
+                                        const struct ether_arp *arp) {
+        assert_se(arp);
+        assert_se(link);
+        assert_se(fd >= 0);
+
+        if (send(fd, arp, sizeof(struct ether_arp), 0) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int arp_network_bind_raw_socket(int index, union sockaddr_union *link) {
+        if (socketpair(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0, test_fd) < 0)
+                return -errno;
+
+        return test_fd[0];
+}
+
+static void test_arp_header(struct ether_arp *arp) {
+        assert_se(arp);
+        assert_se(arp->ea_hdr.ar_hrd == htons(ARPHRD_ETHER)); /* HTYPE */
+        assert_se(arp->ea_hdr.ar_pro == htons(ETHERTYPE_IP)); /* PTYPE */
+        assert_se(arp->ea_hdr.ar_hln == ETH_ALEN); /* HLEN */
+        assert_se(arp->ea_hdr.ar_pln == sizeof arp->arp_spa); /* PLEN */
+        assert_se(arp->ea_hdr.ar_op == htons(ARPOP_REQUEST)); /* REQUEST */
+}
+
+static void test_arp_probe(void) {
+        struct ether_arp arp;
+        struct ether_addr mac_addr = {
+                .ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}};
+        be32_t pa = 0x3030;
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        arp_packet_probe(&arp, pa, &mac_addr);
+        test_arp_header(&arp);
+        assert_se(memcmp(arp.arp_sha, &mac_addr, ETH_ALEN) == 0);
+        assert_se(memcmp(arp.arp_tpa, &pa, sizeof(pa)) == 0);
+}
+
+static void test_arp_announce(void) {
+        struct ether_arp arp;
+        struct ether_addr mac_addr = {
+                .ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}};
+        be32_t pa = 0x3131;
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        arp_packet_announcement(&arp, pa, &mac_addr);
+        test_arp_header(&arp);
+        assert_se(memcmp(arp.arp_sha, &mac_addr, ETH_ALEN) == 0);
+        assert_se(memcmp(arp.arp_tpa, &pa, sizeof(pa)) == 0);
+        assert_se(memcmp(arp.arp_spa, &pa, sizeof(pa)) == 0);
+}
+
+static void test_public_api_setters(sd_event *e) {
+        uint8_t seed[8];
+        sd_ipv4ll *ll;
+        struct ether_addr mac_addr = {
+                .ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}};
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        assert_se(sd_ipv4ll_new(&ll) == 0);
+        assert_se(ll);
+
+        assert_se(sd_ipv4ll_attach_event(NULL, NULL, 0) == -EINVAL);
+        assert_se(sd_ipv4ll_attach_event(ll, e, 0) == 0);
+        assert_se(sd_ipv4ll_attach_event(ll, e, 0) == -EBUSY);
+
+        assert_se(sd_ipv4ll_set_callback(NULL, NULL, NULL) == -EINVAL);
+        assert_se(sd_ipv4ll_set_callback(ll, NULL, NULL) == 0);
+
+        assert_se(sd_ipv4ll_set_address_seed(NULL, NULL) == -EINVAL);
+        assert_se(sd_ipv4ll_set_address_seed(ll, NULL) == -EINVAL);
+        assert_se(sd_ipv4ll_set_address_seed(ll, seed) == 0);
+
+        assert_se(sd_ipv4ll_set_mac(NULL, NULL) == -EINVAL);
+        assert_se(sd_ipv4ll_set_mac(ll, NULL) == -EINVAL);
+        assert_se(sd_ipv4ll_set_mac(ll, &mac_addr) == 0);
+
+        assert_se(sd_ipv4ll_set_index(NULL, -1) == -EINVAL);
+        assert_se(sd_ipv4ll_set_index(ll, -1) == -EINVAL);
+        assert_se(sd_ipv4ll_set_index(ll, -99) == -EINVAL);
+        assert_se(sd_ipv4ll_set_index(ll, 1) == 0);
+        assert_se(sd_ipv4ll_set_index(ll, 99) == 0);
+
+        assert_se(sd_ipv4ll_ref(ll) == ll);
+        assert_se(sd_ipv4ll_unref(ll) == ll);
+
+        /* Cleanup */
+        assert_se(sd_ipv4ll_unref(ll) == NULL);
+}
+
+static void test_basic_request(sd_event *e) {
+
+        sd_ipv4ll *ll;
+        struct ether_arp arp;
+        struct ether_addr mac_addr = {
+                .ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}};
+
+        if (verbose)
+                printf("* %s\n", __FUNCTION__);
+
+        assert_se(sd_ipv4ll_new(&ll) == 0);
+        assert_se(sd_ipv4ll_start(ll) == -EINVAL);
+
+        assert_se(sd_ipv4ll_attach_event(ll, e, 0) == 0);
+        assert_se(sd_ipv4ll_start(ll) == -EINVAL);
+
+        assert_se(sd_ipv4ll_set_mac(ll, &mac_addr) == 0);
+        assert_se(sd_ipv4ll_start(ll) == -EINVAL);
+
+        assert_se(sd_ipv4ll_set_callback(ll, basic_request_handler,
+                                         basic_request_handler_user_data) == 0);
+        assert_se(sd_ipv4ll_start(ll) == -EINVAL);
+
+        assert_se(sd_ipv4ll_set_index(ll, 1) == 0);
+        assert_se(sd_ipv4ll_start(ll) == 0);
+
+        sd_event_run(e, (uint64_t) -1);
+        assert_se(sd_ipv4ll_start(ll) == -EBUSY);
+
+        /* PROBE */
+        sd_event_run(e, (uint64_t) -1);
+        assert_se(read(test_fd[1], &arp, sizeof(struct ether_arp)) == sizeof(struct ether_arp));
+        test_arp_header(&arp);
+
+        if (extended) {
+                /* PROBE */
+                sd_event_run(e, (uint64_t) -1);
+                assert_se(read(test_fd[1], &arp, sizeof(struct ether_arp)) == sizeof(struct ether_arp));
+                test_arp_header(&arp);
+
+                /* PROBE */
+                sd_event_run(e, (uint64_t) -1);
+                assert_se(read(test_fd[1], &arp, sizeof(struct ether_arp)) == sizeof(struct ether_arp));
+                test_arp_header(&arp);
+
+                sd_event_run(e, (uint64_t) -1);
+                assert_se(basic_request_handler_bind == 1);
+        }
+
+        sd_ipv4ll_stop(ll);
+        assert_se(basic_request_handler_stop == 1);
+
+        /* Cleanup */
+        assert_se(sd_ipv4ll_unref(ll) == NULL);
+        safe_close(test_fd[1]);
+}
+
+int main(int argc, char *argv[]) {
+        sd_event *e;
+
+        assert_se(sd_event_new(&e) >= 0);
+
+        test_public_api_setters(e);
+        test_arp_probe();
+        test_arp_announce();
+        test_basic_request(e);
+
+        return 0;
+}