test: extract dummy icmp6 utils for tests

This extracts common implementation of dummy icmp6 utils used by tests.

src/libsystemd-network/fuzz-ndisc-rs.c

@@ -9,50 +9,10 @@
 #include "alloc-util.h"
 #include "fd-util.h"
 #include "fuzz.h"
-#include "icmp6-util.h"
+#include "icmp6-util-unix.h"
 #include "ndisc-internal.h"
 #include "socket-util.h"
 
-static int test_fd[2] = PIPE_EBADF;
-
-int icmp6_bind_router_solicitation(int index) {
-        assert_se(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0, test_fd) >= 0);
-        return test_fd[0];
-}
-
-int icmp6_bind_router_advertisement(int index) {
-        return -ENOSYS;
-}
-
-static struct in6_addr dummy_link_local = {
-        .s6_addr = {
-                0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-                0x12, 0x34, 0x56, 0xff, 0xfe, 0x78, 0x9a, 0xbc,
-        },
-};
-
-int icmp6_receive(
-                int fd,
-                void *iov_base,
-                size_t iov_len,
-                struct in6_addr *ret_sender,
-                triple_timestamp *ret_timestamp) {
-
-        assert_se(read(fd, iov_base, iov_len) == (ssize_t) iov_len);
-
-        if (ret_timestamp)
-                triple_timestamp_get(ret_timestamp);
-
-        if (ret_sender)
-                *ret_sender = dummy_link_local;
-
-        return 0;
-}
-
-int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
-        return 0;
-}
-
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         struct ether_addr mac_addr = {
                 .ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}

src/libsystemd-network/icmp6-util-unix.c

@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <netinet/ip6.h>
+#include <unistd.h>
+
+#include "fd-util.h"
+#include "icmp6-util-unix.h"
+
+send_ra_t send_ra_function = NULL;
+int test_fd[2] = PIPE_EBADF;
+
+static struct in6_addr dummy_link_local = {
+        .s6_addr = {
+                0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x12, 0x34, 0x56, 0xff, 0xfe, 0x78, 0x9a, 0xbc,
+        },
+};
+
+int icmp6_bind_router_solicitation(int ifindex) {
+        if (socketpair(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0, test_fd) < 0)
+                return -errno;
+
+        return test_fd[0];
+}
+
+int icmp6_bind_router_advertisement(int ifindex) {
+        return test_fd[1];
+}
+
+int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
+        if (!send_ra_function)
+                return 0;
+
+        return send_ra_function(0);
+}
+
+int icmp6_receive(
+                int fd,
+                void *iov_base,
+                size_t iov_len,
+                struct in6_addr *ret_sender,
+                triple_timestamp *ret_timestamp) {
+
+        assert_se(read (fd, iov_base, iov_len) == (ssize_t) iov_len);
+
+        if (ret_timestamp)
+                triple_timestamp_get(ret_timestamp);
+
+        if (ret_sender)
+                *ret_sender = dummy_link_local;
+
+        return 0;
+}

src/libsystemd-network/icmp6-util-unix.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "icmp6-util.h"
+
+typedef int (*send_ra_t)(uint8_t flags);
+
+extern send_ra_t send_ra_function;
+extern int test_fd[2];

src/libsystemd-network/meson.build

@@ -82,10 +82,16 @@ executables += [
                 'sources' : files('test-lldp-rx.c'),
         },
         network_test_template + {
-                'sources' : files('test-ndisc-ra.c'),
+                'sources' : files(
+                        'test-ndisc-ra.c',
+                        'icmp6-util-unix.c',
+                ),
         },
         network_test_template + {
-                'sources' : files('test-ndisc-rs.c'),
+                'sources' : files(
+                        'test-ndisc-rs.c',
+                        'icmp6-util-unix.c',
+                ),
         },
         network_test_template + {
                 'sources' : files('test-sd-dhcp-lease.c'),
@@ -106,6 +112,9 @@ executables += [
                 'sources' : files('fuzz-lldp-rx.c'),
         },
         network_fuzz_template + {
-                'sources' : files('fuzz-ndisc-rs.c'),
+                'sources' : files(
+                        'fuzz-ndisc-rs.c',
+                        'icmp6-util-unix.c',
+                ),
         },
 ]

src/libsystemd-network/test-ndisc-ra.c

@@ -11,7 +11,7 @@
 
 #include "alloc-util.h"
 #include "hexdecoct.h"
-#include "icmp6-util.h"
+#include "icmp6-util-unix.h"
 #include "socket-util.h"
 #include "strv.h"
 #include "tests.h"
@@ -52,7 +52,6 @@ static uint8_t advertisement[] = {
 };
 
 static bool test_stopped;
-static int test_fd[2];
 static struct {
         struct in6_addr address;
         unsigned char prefixlen;
@@ -208,36 +207,6 @@ TEST(radv) {
         assert_se(!ra);
 }
 
-int icmp6_bind_router_solicitation(int ifindex) {
-        return -ENOSYS;
-}
-
-int icmp6_bind_router_advertisement(int ifindex) {
-        assert_se(ifindex == 42);
-
-        return test_fd[1];
-}
-
-int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
-
-        return 0;
-}
-
-int icmp6_receive(
-                int fd,
-                void *iov_base,
-                size_t iov_len,
-                struct in6_addr *ret_sender,
-                triple_timestamp *ret_timestamp) {
-
-        assert_se(read (fd, iov_base, iov_len) == (ssize_t)iov_len);
-
-        if (ret_timestamp)
-                triple_timestamp_get(ret_timestamp);
-
-        return 0;
-}
-
 static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
         sd_radv *ra = userdata;
         unsigned char buf[168];

src/libsystemd-network/test-ndisc-rs.c

@@ -12,7 +12,7 @@
 #include "alloc-util.h"
 #include "fd-util.h"
 #include "hexdecoct.h"
-#include "icmp6-util.h"
+#include "icmp6-util-unix.h"
 #include "socket-util.h"
 #include "strv.h"
 #include "ndisc-internal.h"
@@ -23,12 +23,8 @@ static struct ether_addr mac_addr = {
 };
 
 static bool verbose = false;
-static int test_fd[2];
 static sd_ndisc *test_timeout_nd;
 
-typedef int (*send_ra_t)(uint8_t flags);
-static send_ra_t send_ra_function;
-
 static void router_dump(sd_ndisc_router *rt) {
         struct in6_addr addr;
         uint8_t hop_limit;
@@ -164,44 +160,6 @@ static void router_dump(sd_ndisc_router *rt) {
         }
 }
 
-int icmp6_bind_router_solicitation(int ifindex) {
-        assert_se(ifindex == 42);
-
-        if (socketpair(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0, test_fd) < 0)
-                return -errno;
-
-        return test_fd[0];
-}
-
-int icmp6_bind_router_advertisement(int ifindex) {
-        return -ENOSYS;
-}
-
-static struct in6_addr dummy_link_local = {
-        .s6_addr = {
-                0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-                0x12, 0x34, 0x56, 0xff, 0xfe, 0x78, 0x9a, 0xbc,
-        },
-};
-
-int icmp6_receive(
-                int fd,
-                void *iov_base,
-                size_t iov_len,
-                struct in6_addr *ret_sender,
-                triple_timestamp *ret_timestamp) {
-
-        assert_se(read (fd, iov_base, iov_len) == (ssize_t)iov_len);
-
-        if (ret_timestamp)
-                triple_timestamp_get(ret_timestamp);
-
-        if (ret_sender)
-                *ret_sender = dummy_link_local;
-
-        return 0;
-}
-
 static int send_ra(uint8_t flags) {
         uint8_t advertisement[] = {
                 0x86, 0x00, 0xde, 0x83, 0x40, 0xc0, 0x00, 0xb4,
@@ -230,13 +188,6 @@ static int send_ra(uint8_t flags) {
         return 0;
 }
 
-int icmp6_send_router_solicitation(int s, const struct ether_addr *ether_addr) {
-        if (!send_ra_function)
-                return 0;
-
-        return send_ra_function(0);
-}
-
 static void test_callback(sd_ndisc *nd, sd_ndisc_event_t event, sd_ndisc_router *rt, void *userdata) {
         sd_event *e = userdata;
         static unsigned idx = 0;