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-rw-r--r--src/shared/bus-message-util.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/src/shared/bus-message-util.c b/src/shared/bus-message-util.c
new file mode 100644
index 0000000..53f6350
--- /dev/null
+++ b/src/shared/bus-message-util.c
@@ -0,0 +1,185 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "bus-message-util.h"
+
+#include "resolve-util.h"
+
+int bus_message_read_ifindex(sd_bus_message *message, sd_bus_error *error, int *ret) {
+ int ifindex, r;
+
+ assert(message);
+ assert(ret);
+
+ assert_cc(sizeof(int) == sizeof(int32_t));
+
+ r = sd_bus_message_read(message, "i", &ifindex);
+ if (r < 0)
+ return r;
+
+ if (ifindex <= 0)
+ return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
+
+ *ret = ifindex;
+
+ return 0;
+}
+
+int bus_message_read_family(sd_bus_message *message, sd_bus_error *error, int *ret) {
+ int family, r;
+
+ assert(message);
+ assert(ret);
+
+ assert_cc(sizeof(int) == sizeof(int32_t));
+
+ r = sd_bus_message_read(message, "i", &family);
+ if (r < 0)
+ return r;
+
+ if (!IN_SET(family, AF_INET, AF_INET6))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
+
+ *ret = family;
+ return 0;
+}
+
+int bus_message_read_in_addr_auto(sd_bus_message *message, sd_bus_error *error, int *ret_family, union in_addr_union *ret_addr) {
+ int family, r;
+ const void *d;
+ size_t sz;
+
+ assert(message);
+
+ r = sd_bus_message_read(message, "i", &family);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_read_array(message, 'y', &d, &sz);
+ if (r < 0)
+ return r;
+
+ if (!IN_SET(family, AF_INET, AF_INET6))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
+
+ if (sz != FAMILY_ADDRESS_SIZE(family))
+ return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
+
+ if (ret_family)
+ *ret_family = family;
+ if (ret_addr)
+ memcpy(ret_addr, d, sz);
+ return 0;
+}
+
+static int bus_message_read_dns_one(
+ sd_bus_message *message,
+ sd_bus_error *error,
+ bool extended,
+ int *ret_family,
+ union in_addr_union *ret_address,
+ uint16_t *ret_port,
+ const char **ret_server_name) {
+ const char *server_name = NULL;
+ union in_addr_union a;
+ uint16_t port = 0;
+ int family, r;
+
+ assert(message);
+ assert(ret_family);
+ assert(ret_address);
+ assert(ret_port);
+ assert(ret_server_name);
+
+ r = sd_bus_message_enter_container(message, 'r', extended ? "iayqs" : "iay");
+ if (r <= 0)
+ return r;
+
+ r = bus_message_read_in_addr_auto(message, error, &family, &a);
+ if (r < 0)
+ return r;
+
+ if (!dns_server_address_valid(family, &a)) {
+ r = sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid DNS server address");
+ assert(r < 0);
+ return r;
+ }
+
+ if (extended) {
+ r = sd_bus_message_read(message, "q", &port);
+ if (r < 0)
+ return r;
+
+ if (IN_SET(port, 53, 853))
+ port = 0;
+
+ r = sd_bus_message_read(message, "s", &server_name);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_message_exit_container(message);
+ if (r < 0)
+ return r;
+
+ *ret_family = family;
+ *ret_address = a;
+ *ret_port = port;
+ *ret_server_name = server_name;
+
+ return 1;
+}
+
+int bus_message_read_dns_servers(
+ sd_bus_message *message,
+ sd_bus_error *error,
+ bool extended,
+ struct in_addr_full ***ret_dns,
+ size_t *ret_n_dns) {
+
+ struct in_addr_full **dns = NULL;
+ size_t n = 0;
+ int r;
+
+ assert(message);
+ assert(ret_dns);
+ assert(ret_n_dns);
+
+ r = sd_bus_message_enter_container(message, 'a', extended ? "(iayqs)" : "(iay)");
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ const char *server_name;
+ union in_addr_union a;
+ uint16_t port;
+ int family;
+
+ r = bus_message_read_dns_one(message, error, extended, &family, &a, &port, &server_name);
+ if (r < 0)
+ goto clear;
+ if (r == 0)
+ break;
+
+ if (!GREEDY_REALLOC(dns, n+1)) {
+ r = -ENOMEM;
+ goto clear;
+ }
+
+ r = in_addr_full_new(family, &a, port, 0, server_name, dns + n);
+ if (r < 0)
+ goto clear;
+
+ n++;
+ }
+
+ *ret_dns = TAKE_PTR(dns);
+ *ret_n_dns = n;
+ return 0;
+
+clear:
+ for (size_t i = 0; i < n; i++)
+ in_addr_full_free(dns[i]);
+ free(dns);
+
+ return r;
+}