sd-bus: add new call sd_bus_get_scope() for querying whether one is connected to...

[elogind.git] / src / libsystemd / sd-bus / bus-kernel.c

diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c
index 3bf7b074efb3ad7a3adcea27b8230233cd848a10..58f011ff86b65a83827b420f382f2afc7e5ab76c 100644 (file)
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -32,6 +32,8 @@
 #include "util.h"
 #include "strv.h"
 #include "memfd-util.h"
+#include "cgroup-util.h"
+#include "fileio.h"
 
 #include "bus-internal.h"
 #include "bus-message.h"
@@ -39,7 +41,6 @@
 #include "bus-bloom.h"
 #include "bus-util.h"
 #include "bus-label.h"
-#include "cgroup-util.h"
 
 #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
 
@@ -953,24 +954,37 @@ int bus_kernel_connect(sd_bus *b) {
         return bus_kernel_take_fd(b);
 }
 
+int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
+        struct kdbus_cmd_free cmd = {
+                .flags = 0,
+                .offset = offset,
+        };
+        int r;
+
+        assert(bus);
+        assert(bus->is_kernel);
+
+        r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
+        if (r < 0)
+                return -errno;
+
+        return 0;
+}
+
 static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
-        struct kdbus_cmd_free cmd = {};
         struct kdbus_item *d;
 
         assert(bus);
         assert(k);
 
-        cmd.offset = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
-
         KDBUS_ITEM_FOREACH(d, k, items) {
-
                 if (d->type == KDBUS_ITEM_FDS)
                         close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
                 else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
                         safe_close(d->memfd.fd);
         }
 
-        (void) ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
+        bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
 }
 
 int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
@@ -1058,7 +1072,7 @@ int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call
 
                                 /* Anybody can send us invalid messages, let's just drop them. */
                                 if (r == -EBADMSG || r == -EPROTOTYPE)
-                                        log_debug("Ignoring invalid message: %s", strerror(-r));
+                                        log_debug_errno(r, "Ignoring invalid message: %m");
                                 else
                                         return r;
                         }
@@ -1242,7 +1256,7 @@ int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
 
                 /* Anybody can send us invalid messages, let's just drop them. */
                 if (r == -EBADMSG || r == -EPROTOTYPE) {
-                        log_debug("Ignoring invalid message: %s", strerror(-r));
+                        log_debug_errno(r, "Ignoring invalid message: %m");
                         r = 0;
                 }
 
@@ -1796,3 +1810,74 @@ int bus_kernel_realize_attach_flags(sd_bus *bus) {
 
         return 0;
 }
+
+int bus_kernel_fix_attach_mask(void) {
+        _cleanup_free_ char *mask = NULL;
+        uint64_t m = (uint64_t) -1;
+        char buf[2+16+2];
+        int r;
+
+        /* By default we don't want any kdbus metadata fields to be
+         * suppressed, hence we reset the kernel mask for it to
+         * (uint64_t) -1. This is overridable via a kernel command
+         * line option, however. */
+
+        r = get_proc_cmdline_key("systemd.kdbus_attach_flags_mask=", &mask);
+        if (r < 0)
+                return log_warning_errno(r, "Failed to read kernel command line: %m");
+
+        if (mask) {
+                const char *p = mask;
+
+                if (startswith(p, "0x"))
+                        p += 2;
+
+                if (sscanf(p, "%" PRIx64, &m) != 1)
+                        log_warning("Couldn't parse systemd.kdbus_attach_flags_mask= kernel command line parameter.");
+        }
+
+        sprintf(buf, "0x%" PRIx64 "\n", m);
+        r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
+        if (r < 0)
+                return log_full_errno(
+                                r == -EROFS ? LOG_DEBUG : LOG_WARNING, r,
+                                "Failed to write kdbus attach mask: %m");
+
+        return 0;
+}
+
+int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
+        struct kdbus_cmd_info cmd = {
+                .size = sizeof(struct kdbus_cmd_info),
+        };
+        struct kdbus_info *info;
+        struct kdbus_item *item;
+        char *n = NULL;
+        int r;
+
+        assert(bus);
+        assert(name);
+        assert(bus->is_kernel);
+
+        r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
+        if (r < 0)
+                return -errno;
+
+        info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
+
+        KDBUS_ITEM_FOREACH(item, info, items)
+                if (item->type == KDBUS_ITEM_MAKE_NAME) {
+                        r = free_and_strdup(&n, item->str);
+                        break;
+                }
+
+        bus_kernel_cmd_free(bus, cmd.offset);
+
+        if (r < 0)
+                return r;
+        if (!n)
+                return -EIO;
+
+        *name = n;
+        return 0;
+}