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Diffstat (limited to 'src/libsystemd/sd-bus/sd-bus.c')
-rw-r--r--src/libsystemd/sd-bus/sd-bus.c352
1 files changed, 283 insertions, 69 deletions
diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
index 0ca225c617..a23f7257fa 100644
--- a/src/libsystemd/sd-bus/sd-bus.c
+++ b/src/libsystemd/sd-bus/sd-bus.c
@@ -33,6 +33,7 @@
#include "missing.h"
#include "def.h"
#include "cgroup-util.h"
+#include "hostname-util.h"
#include "bus-label.h"
#include "sd-bus.h"
@@ -68,18 +69,18 @@ static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
static int attach_io_events(sd_bus *b);
static void detach_io_events(sd_bus *b);
+static thread_local sd_bus *default_system_bus = NULL;
+static thread_local sd_bus *default_user_bus = NULL;
+static thread_local sd_bus *default_starter_bus = NULL;
+
static void bus_close_fds(sd_bus *b) {
assert(b);
detach_io_events(b);
- if (b->input_fd >= 0)
- safe_close(b->input_fd);
-
- if (b->output_fd >= 0 && b->output_fd != b->input_fd)
+ if (b->input_fd != b->output_fd)
safe_close(b->output_fd);
-
- b->input_fd = b->output_fd = -1;
+ b->output_fd = b->input_fd = safe_close(b->input_fd);
}
static void bus_reset_queues(sd_bus *b) {
@@ -88,15 +89,13 @@ static void bus_reset_queues(sd_bus *b) {
while (b->rqueue_size > 0)
sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
- free(b->rqueue);
- b->rqueue = NULL;
+ b->rqueue = mfree(b->rqueue);
b->rqueue_allocated = 0;
while (b->wqueue_size > 0)
sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
- free(b->wqueue);
- b->wqueue = NULL;
+ b->wqueue = mfree(b->wqueue);
b->wqueue_allocated = 0;
}
@@ -220,8 +219,8 @@ _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
_public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
assert_return(bus, -EINVAL);
assert_return(bus->state == BUS_UNSET, -EPERM);
- assert_return(input_fd >= 0, -EINVAL);
- assert_return(output_fd >= 0, -EINVAL);
+ assert_return(input_fd >= 0, -EBADF);
+ assert_return(output_fd >= 0, -EBADF);
assert_return(!bus_pid_changed(bus), -ECHILD);
bus->input_fd = input_fd;
@@ -825,8 +824,7 @@ static int parse_container_unix_address(sd_bus *b, const char **p, char **guid)
b->machine = machine;
machine = NULL;
} else {
- free(b->machine);
- b->machine = NULL;
+ b->machine = mfree(b->machine);
}
if (pid) {
@@ -885,8 +883,7 @@ static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid
b->machine = machine;
machine = NULL;
} else {
- free(b->machine);
- b->machine = NULL;
+ b->machine = mfree(b->machine);
}
if (pid) {
@@ -896,10 +893,9 @@ static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid
} else
b->nspid = 0;
- free(b->kernel);
- b->kernel = strdup("/sys/fs/kdbus/0-system/bus");
- if (!b->kernel)
- return -ENOMEM;
+ r = free_and_strdup(&b->kernel, "/sys/fs/kdbus/0-system/bus");
+ if (r < 0)
+ return r;
return 0;
}
@@ -909,15 +905,11 @@ static void bus_reset_parsed_address(sd_bus *b) {
zero(b->sockaddr);
b->sockaddr_size = 0;
- strv_free(b->exec_argv);
- free(b->exec_path);
- b->exec_path = NULL;
- b->exec_argv = NULL;
+ b->exec_argv = strv_free(b->exec_argv);
+ b->exec_path = mfree(b->exec_path);
b->server_id = SD_ID128_NULL;
- free(b->kernel);
- b->kernel = NULL;
- free(b->machine);
- b->machine = NULL;
+ b->kernel = mfree(b->kernel);
+ b->machine = mfree(b->machine);
b->nspid = 0;
}
@@ -1012,6 +1004,8 @@ static int bus_parse_next_address(sd_bus *b) {
}
static int bus_start_address(sd_bus *b) {
+ bool container_kdbus_available = false;
+ bool kdbus_available = false;
int r;
assert(b);
@@ -1021,17 +1015,40 @@ static int bus_start_address(sd_bus *b) {
bus_close_fds(b);
+ /*
+ * Usually, if you provide multiple different bus-addresses, we
+ * try all of them in order. We use the first one that
+ * succeeds. However, if you mix kernel and unix addresses, we
+ * never try unix-addresses if a previous kernel address was
+ * tried and kdbus was available. This is required to prevent
+ * clients to fallback to the bus-proxy if kdbus is available
+ * but failed (eg., too many connections).
+ */
+
if (b->exec_path)
r = bus_socket_exec(b);
- else if ((b->nspid > 0 || b->machine) && b->kernel)
+ else if ((b->nspid > 0 || b->machine) && b->kernel) {
r = bus_container_connect_kernel(b);
- else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
- r = bus_container_connect_socket(b);
- else if (b->kernel)
+ if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
+ container_kdbus_available = true;
+
+ } else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC) {
+ if (!container_kdbus_available)
+ r = bus_container_connect_socket(b);
+ else
+ skipped = true;
+
+ } else if (b->kernel) {
r = bus_kernel_connect(b);
- else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
- r = bus_socket_connect(b);
- else
+ if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
+ kdbus_available = true;
+
+ } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) {
+ if (!kdbus_available)
+ r = bus_socket_connect(b);
+ else
+ skipped = true;
+ } else
skipped = true;
if (!skipped) {
@@ -1224,6 +1241,8 @@ fail:
int bus_set_address_user(sd_bus *b) {
const char *e;
+ uid_t uid;
+ int r;
assert(b);
@@ -1231,6 +1250,10 @@ int bus_set_address_user(sd_bus *b) {
if (e)
return sd_bus_set_address(b, e);
+ r = cg_pid_get_owner_uid(0, &uid);
+ if (r < 0)
+ uid = getuid();
+
e = secure_getenv("XDG_RUNTIME_DIR");
if (e) {
_cleanup_free_ char *ee = NULL;
@@ -1239,9 +1262,9 @@ int bus_set_address_user(sd_bus *b) {
if (!ee)
return -ENOMEM;
- (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, getuid(), ee);
+ (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, ee);
} else
- (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid());
+ (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, uid);
if (!b->address)
return -ENOMEM;
@@ -1959,37 +1982,39 @@ _public_ int sd_bus_call(
unsigned i;
int r;
- assert_return(m, -EINVAL);
- assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
- assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
- assert_return(!bus_error_is_dirty(error), -EINVAL);
+ bus_assert_return(m, -EINVAL, error);
+ bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
+ bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
+ bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
if (!bus)
bus = m->bus;
- assert_return(!bus_pid_changed(bus), -ECHILD);
- assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
+ bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
+ bus_assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS, error);
- if (!BUS_IS_OPEN(bus->state))
- return -ENOTCONN;
+ if (!BUS_IS_OPEN(bus->state)) {
+ r = -ENOTCONN;
+ goto fail;
+ }
r = bus_ensure_running(bus);
if (r < 0)
- return r;
+ goto fail;
i = bus->rqueue_size;
r = bus_seal_message(bus, m, usec);
if (r < 0)
- return r;
+ goto fail;
r = bus_remarshal_message(bus, &m);
if (r < 0)
- return r;
+ goto fail;
r = bus_send_internal(bus, m, &cookie, true);
if (r < 0)
- return r;
+ goto fail;
timeout = calc_elapse(m->timeout);
@@ -2020,14 +2045,17 @@ _public_ int sd_bus_call(
}
r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
+ sd_bus_message_unref(incoming);
+ return r;
- } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
+ } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
r = sd_bus_error_copy(error, &incoming->error);
- else
+ sd_bus_message_unref(incoming);
+ return r;
+ } else {
r = -EIO;
-
- sd_bus_message_unref(incoming);
- return r;
+ goto fail;
+ }
} else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
bus->unique_name &&
@@ -2043,7 +2071,8 @@ _public_ int sd_bus_call(
* immediately. */
sd_bus_message_unref(incoming);
- return -ELOOP;
+ r = -ELOOP;
+ goto fail;
}
/* Try to read more, right-away */
@@ -2054,10 +2083,10 @@ _public_ int sd_bus_call(
if (r < 0) {
if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
bus_enter_closing(bus);
- return -ECONNRESET;
+ r = -ECONNRESET;
}
- return r;
+ goto fail;
}
if (r > 0)
continue;
@@ -2066,8 +2095,10 @@ _public_ int sd_bus_call(
usec_t n;
n = now(CLOCK_MONOTONIC);
- if (n >= timeout)
- return -ETIMEDOUT;
+ if (n >= timeout) {
+ r = -ETIMEDOUT;
+ goto fail;
+ }
left = timeout - n;
} else
@@ -2075,20 +2106,25 @@ _public_ int sd_bus_call(
r = bus_poll(bus, true, left);
if (r < 0)
- return r;
- if (r == 0)
- return -ETIMEDOUT;
+ goto fail;
+ if (r == 0) {
+ r = -ETIMEDOUT;
+ goto fail;
+ }
r = dispatch_wqueue(bus);
if (r < 0) {
if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
bus_enter_closing(bus);
- return -ECONNRESET;
+ r = -ECONNRESET;
}
- return r;
+ goto fail;
}
}
+
+fail:
+ return sd_bus_error_set_errno(error, r);
}
_public_ int sd_bus_get_fd(sd_bus *bus) {
@@ -3316,14 +3352,11 @@ static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus
}
_public_ int sd_bus_default_system(sd_bus **ret) {
- static thread_local sd_bus *default_system_bus = NULL;
-
return bus_default(sd_bus_open_system, &default_system_bus, ret);
}
-_public_ int sd_bus_default_user(sd_bus **ret) {
- static thread_local sd_bus *default_user_bus = NULL;
+_public_ int sd_bus_default_user(sd_bus **ret) {
return bus_default(sd_bus_open_user, &default_user_bus, ret);
}
@@ -3350,7 +3383,6 @@ _public_ int sd_bus_default(sd_bus **ret) {
e = secure_getenv("DBUS_STARTER_ADDRESS");
if (e) {
- static thread_local sd_bus *default_starter_bus = NULL;
return bus_default(sd_bus_open, &default_starter_bus, ret);
}
@@ -3422,6 +3454,171 @@ _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **ext
return 1;
}
+_public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
+ _cleanup_strv_free_ char **labels = NULL;
+ char *path, *path_pos, **label_pos;
+ const char *sep, *template_pos;
+ size_t path_length;
+ va_list list;
+ int r;
+
+ assert_return(out, -EINVAL);
+ assert_return(path_template, -EINVAL);
+
+ path_length = strlen(path_template);
+
+ va_start(list, path_template);
+ for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
+ const char *arg;
+ char *label;
+
+ arg = va_arg(list, const char *);
+ if (!arg) {
+ va_end(list);
+ return -EINVAL;
+ }
+
+ label = bus_label_escape(arg);
+ if (!label) {
+ va_end(list);
+ return -ENOMEM;
+ }
+
+ r = strv_consume(&labels, label);
+ if (r < 0) {
+ va_end(list);
+ return r;
+ }
+
+ /* add label length, but account for the format character */
+ path_length += strlen(label) - 1;
+ }
+ va_end(list);
+
+ path = malloc(path_length + 1);
+ if (!path)
+ return -ENOMEM;
+
+ path_pos = path;
+ label_pos = labels;
+
+ for (template_pos = path_template; *template_pos; ) {
+ sep = strchrnul(template_pos, '%');
+ path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
+ if (!*sep)
+ break;
+
+ path_pos = stpcpy(path_pos, *label_pos++);
+ template_pos = sep + 1;
+ }
+
+ *path_pos = 0;
+ *out = path;
+ return 0;
+}
+
+_public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
+ _cleanup_strv_free_ char **labels = NULL;
+ const char *template_pos, *path_pos;
+ char **label_pos;
+ va_list list;
+ int r;
+
+ /*
+ * This decodes an object-path based on a template argument. The
+ * template consists of a verbatim path, optionally including special
+ * directives:
+ *
+ * - Each occurrence of '%' in the template matches an arbitrary
+ * substring of a label in the given path. At most one such
+ * directive is allowed per label. For each such directive, the
+ * caller must provide an output parameter (char **) via va_arg. If
+ * NULL is passed, the given label is verified, but not returned.
+ * For each matched label, the *decoded* label is stored in the
+ * passed output argument, and the caller is responsible to free
+ * it. Note that the output arguments are only modified if the
+ * actualy path matched the template. Otherwise, they're left
+ * untouched.
+ *
+ * This function returns <0 on error, 0 if the path does not match the
+ * template, 1 if it matched.
+ */
+
+ assert_return(path, -EINVAL);
+ assert_return(path_template, -EINVAL);
+
+ path_pos = path;
+
+ for (template_pos = path_template; *template_pos; ) {
+ const char *sep;
+ size_t length;
+ char *label;
+
+ /* verify everything until the next '%' matches verbatim */
+ sep = strchrnul(template_pos, '%');
+ length = sep - template_pos;
+ if (strncmp(path_pos, template_pos, length))
+ return 0;
+
+ path_pos += length;
+ template_pos += length;
+
+ if (!*template_pos)
+ break;
+
+ /* We found the next '%' character. Everything up until here
+ * matched. We now skip ahead to the end of this label and make
+ * sure it matches the tail of the label in the path. Then we
+ * decode the string in-between and save it for later use. */
+
+ ++template_pos; /* skip over '%' */
+
+ sep = strchrnul(template_pos, '/');
+ length = sep - template_pos; /* length of suffix to match verbatim */
+
+ /* verify the suffixes match */
+ sep = strchrnul(path_pos, '/');
+ if (sep - path_pos < (ssize_t)length ||
+ strncmp(sep - length, template_pos, length))
+ return 0;
+
+ template_pos += length; /* skip over matched label */
+ length = sep - path_pos - length; /* length of sub-label to decode */
+
+ /* store unescaped label for later use */
+ label = bus_label_unescape_n(path_pos, length);
+ if (!label)
+ return -ENOMEM;
+
+ r = strv_consume(&labels, label);
+ if (r < 0)
+ return r;
+
+ path_pos = sep; /* skip decoded label and suffix */
+ }
+
+ /* end of template must match end of path */
+ if (*path_pos)
+ return 0;
+
+ /* copy the labels over to the caller */
+ va_start(list, path_template);
+ for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
+ char **arg;
+
+ arg = va_arg(list, char **);
+ if (arg)
+ *arg = *label_pos;
+ else
+ free(*label_pos);
+ }
+ va_end(list);
+
+ free(labels);
+ labels = NULL;
+ return 1;
+}
+
_public_ int sd_bus_try_close(sd_bus *bus) {
int r;
@@ -3573,3 +3770,20 @@ _public_ int sd_bus_is_monitor(sd_bus *bus) {
return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
}
+
+static void flush_close(sd_bus *bus) {
+ if (!bus)
+ return;
+
+ /* Flushes and closes the specified bus. We take a ref before,
+ * to ensure the flushing does not cause the bus to be
+ * unreferenced. */
+
+ sd_bus_flush_close_unref(sd_bus_ref(bus));
+}
+
+_public_ void sd_bus_default_flush_close(void) {
+ flush_close(default_starter_bus);
+ flush_close(default_user_bus);
+ flush_close(default_system_bus);
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-01-25 06:42:28 +0000