From: Lennart Poettering <lennart@amutable.com>
Date: Fri, 20 Mar 2026 14:16:19 +0000 (+0100)
Subject: json-util: add json_dispatch_in6_addr()
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9eb207356c9c75e80e976ee4cb1ad8a11ce8972f;p=thirdparty%2Fsystemd.git

json-util: add json_dispatch_in6_addr()
---

diff --git a/src/libsystemd/sd-json/json-util.c b/src/libsystemd/sd-json/json-util.c
index 32578168db0..c321579ef50 100644
--- a/src/libsystemd/sd-json/json-util.c
+++ b/src/libsystemd/sd-json/json-util.c
@@ -214,6 +214,40 @@ int json_dispatch_in_addr(const char *name, sd_json_variant *variant, sd_json_di
         return 0;
 }
 
+int json_dispatch_in6_addr(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata) {
+        struct in6_addr *address = ASSERT_PTR(userdata);
+        _cleanup_(iovec_done) struct iovec iov = {};
+        int r;
+
+        if (sd_json_variant_is_null(variant)) {
+                *address = (struct in6_addr) {};
+                return 0;
+        }
+
+        /* We support both a more human readable string based encoding and an array based encoding */
+        if (sd_json_variant_is_string(variant)) {
+                union in_addr_union a;
+                r = in_addr_from_string(AF_INET6, sd_json_variant_string(variant), &a);
+                if (r < 0)
+                        return json_log(variant, flags, r,
+                                        "JSON field '%s' is not a valid IPv6 address string: %s", strna(name), sd_json_variant_string(variant));
+
+                *address = a.in6;
+                return 0;
+        }
+
+        r = json_dispatch_byte_array_iovec(name, variant, flags, &iov);
+        if (r < 0)
+                return r;
+
+        if (iov.iov_len != sizeof(struct in6_addr))
+                return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL),
+                                "Expected JSON field '%s' to be an array of %zu bytes.", strna(name), sizeof(struct in6_addr));
+
+        memcpy(address, iov.iov_base, iov.iov_len);
+        return 0;
+}
+
 int json_dispatch_const_path(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata) {
         const char **p = ASSERT_PTR(userdata), *path;
 
diff --git a/src/libsystemd/sd-json/json-util.h b/src/libsystemd/sd-json/json-util.h
index 847725a41e2..478d2a2a212 100644
--- a/src/libsystemd/sd-json/json-util.h
+++ b/src/libsystemd/sd-json/json-util.h
@@ -115,6 +115,7 @@ int json_dispatch_user_group_name(const char *name, sd_json_variant *variant, sd
 int json_dispatch_const_user_group_name(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_const_unit_name(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_in_addr(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
+int json_dispatch_in6_addr(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_path(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_const_path(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
 int json_dispatch_strv_path(const char *name, sd_json_variant *variant, sd_json_dispatch_flags_t flags, void *userdata);
diff --git a/src/test/test-json.c b/src/test/test-json.c
index e9650339a1a..d6308b23e7d 100644
--- a/src/test/test-json.c
+++ b/src/test/test-json.c
@@ -1733,4 +1733,98 @@ TEST(json_dispatch_in_addr) {
                                 &dummy), EINVAL);
 }
 
+TEST(json_dispatch_in6_addr) {
+        _cleanup_(sd_json_variant_unrefp) sd_json_variant *j = NULL;
+
+        /* ::1 */
+        ASSERT_OK(sd_json_build(&j, SD_JSON_BUILD_OBJECT(
+                                             SD_JSON_BUILD_PAIR("addr", JSON_BUILD_IN6_ADDR(&(const struct in6_addr) { .s6_addr = { [15] = 1 } })),
+                                             SD_JSON_BUILD_PAIR("null_addr", SD_JSON_BUILD_NULL))));
+
+        struct {
+                struct in6_addr addr;
+                struct in6_addr null_addr;
+        } data = {};
+
+        ASSERT_OK(sd_json_dispatch(j,
+                                (const sd_json_dispatch_field[]) {
+                                        { "addr",      _SD_JSON_VARIANT_TYPE_INVALID, json_dispatch_in6_addr, offsetof(typeof(data), addr)      },
+                                        { "null_addr", _SD_JSON_VARIANT_TYPE_INVALID, json_dispatch_in6_addr, offsetof(typeof(data), null_addr) },
+                                        {},
+                                },
+                                /* flags= */ 0,
+                                &data));
+
+        ASSERT_EQ(data.addr.s6_addr[15], 1);
+        for (size_t i = 0; i < 15; i++)
+                ASSERT_EQ(data.addr.s6_addr[i], 0);
+        for (size_t i = 0; i < 16; i++)
+                ASSERT_EQ(data.null_addr.s6_addr[i], 0);
+
+        struct in6_addr dummy = {};
+
+        /* Too few bytes (15 instead of 16) */
+        j = sd_json_variant_unref(j);
+        ASSERT_OK(sd_json_build(&j, SD_JSON_BUILD_OBJECT(
+                                             SD_JSON_BUILD_PAIR("addr", SD_JSON_BUILD_ARRAY(
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0),
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0),
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0),
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(1))))));
+        ASSERT_ERROR(sd_json_dispatch(j,
+                                (const sd_json_dispatch_field[]) {
+                                        { "addr", _SD_JSON_VARIANT_TYPE_INVALID, json_dispatch_in6_addr, 0 },
+                                        {},
+                                },
+                                /* flags= */ 0,
+                                &dummy), EINVAL);
+
+        /* Too many bytes (17 instead of 16) */
+        j = sd_json_variant_unref(j);
+        ASSERT_OK(sd_json_build(&j, SD_JSON_BUILD_OBJECT(
+                                             SD_JSON_BUILD_PAIR("addr", SD_JSON_BUILD_ARRAY(
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0),
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0),
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0),
+                                                                                SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(0), SD_JSON_BUILD_UNSIGNED(1),
+                                                                                SD_JSON_BUILD_UNSIGNED(0))))));
+        ASSERT_ERROR(sd_json_dispatch(j,
+                                (const sd_json_dispatch_field[]) {
+                                        { "addr", _SD_JSON_VARIANT_TYPE_INVALID, json_dispatch_in6_addr, 0 },
+                                        {},
+                                },
+                                /* flags= */ 0,
+                                &dummy), EINVAL);
+
+        /* Not an array */
+        j = sd_json_variant_unref(j);
+        ASSERT_OK(sd_json_build(&j, SD_JSON_BUILD_OBJECT(
+                                             SD_JSON_BUILD_PAIR("addr", SD_JSON_BUILD_BOOLEAN(true)))));
+        ASSERT_ERROR(sd_json_dispatch(j,
+                                (const sd_json_dispatch_field[]) {
+                                        { "addr", _SD_JSON_VARIANT_TYPE_INVALID, json_dispatch_in6_addr, 0 },
+                                        {},
+                                },
+                                /* flags= */ 0,
+                                &dummy), EINVAL);
+
+        /* A string */
+        j = sd_json_variant_unref(j);
+        ASSERT_OK(sd_json_build(&j, SD_JSON_BUILD_OBJECT(
+                                             SD_JSON_BUILD_PAIR("addr", JSON_BUILD_CONST_STRING("::1")))));
+
+        zero(data);
+        ASSERT_OK(sd_json_dispatch(j,
+                                (const sd_json_dispatch_field[]) {
+                                        { "addr", _SD_JSON_VARIANT_TYPE_INVALID, json_dispatch_in6_addr, 0 },
+                                        {},
+                                },
+                                /* flags= */ 0,
+                                &data));
+
+        ASSERT_EQ(data.addr.s6_addr[15], 1);
+        for (size_t i = 0; i < 15; i++)
+                ASSERT_EQ(data.addr.s6_addr[i], 0);
+}
+
 DEFINE_TEST_MAIN(LOG_DEBUG);