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path: root/src/libsystemd-bus/sd-bus.c
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Diffstat (limited to 'src/libsystemd-bus/sd-bus.c')
-rw-r--r--src/libsystemd-bus/sd-bus.c330
1 files changed, 207 insertions, 123 deletions
diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c
index 941b33ab69..df4010265f 100644
--- a/src/libsystemd-bus/sd-bus.c
+++ b/src/libsystemd-bus/sd-bus.c
@@ -82,33 +82,91 @@ static void bus_free(sd_bus *b) {
free(b);
}
-static sd_bus* bus_new(void) {
+int sd_bus_new(sd_bus **ret) {
sd_bus *r;
+ if (!ret)
+ return -EINVAL;
+
r = new0(sd_bus, 1);
if (!r)
- return NULL;
+ return -ENOMEM;
r->n_ref = 1;
r->fd = -1;
r->message_version = 1;
+ r->negotiate_fds = true;
/* We guarantee that wqueue always has space for at least one
* entry */
r->wqueue = new(sd_bus_message*, 1);
if (!r->wqueue) {
free(r);
- return NULL;
+ return -ENOMEM;
}
- return r;
-};
+ *ret = r;
+ return 0;
+}
+
+int sd_bus_set_address(sd_bus *bus, const char *address) {
+ char *a;
+
+ if (!bus)
+ return -EINVAL;
+ if (bus->state != BUS_UNSET)
+ return -EPERM;
+ if (!address)
+ return -EINVAL;
+
+ a = strdup(address);
+ if (!a)
+ return -ENOMEM;
+
+ free(bus->address);
+ bus->address = a;
+
+ return 0;
+}
+
+int sd_bus_set_fd(sd_bus *bus, int fd) {
+ if (!bus)
+ return -EINVAL;
+ if (bus->state != BUS_UNSET)
+ return -EPERM;
+ if (fd < 0)
+ return -EINVAL;
+
+ bus->fd = fd;
+ return 0;
+}
+
+int sd_bus_set_hello(sd_bus *bus, int b) {
+ if (!bus)
+ return -EINVAL;
+ if (bus->state != BUS_UNSET)
+ return -EPERM;
+
+ bus->send_hello = !!b;
+ return 0;
+}
+
+int sd_bus_set_negotiate_fds(sd_bus *bus, int b) {
+ if (!bus)
+ return -EINVAL;
+ if (bus->state != BUS_UNSET)
+ return -EPERM;
+
+ bus->negotiate_fds = !!b;
+ return 0;
+}
static int hello_callback(sd_bus *bus, int error, sd_bus_message *reply, void *userdata) {
const char *s;
int r;
assert(bus);
+ assert(bus->state == BUS_HELLO);
if (error != 0)
return -error;
@@ -137,6 +195,9 @@ static int bus_send_hello(sd_bus *bus) {
assert(bus);
+ if (!bus->send_hello)
+ return 0;
+
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.DBus",
@@ -151,14 +212,13 @@ static int bus_send_hello(sd_bus *bus) {
if (r < 0)
return r;
- bus->sent_hello = true;
return r;
}
static int bus_start_running(sd_bus *bus) {
assert(bus);
- if (bus->sent_hello) {
+ if (bus->send_hello) {
bus->state = BUS_HELLO;
return 1;
}
@@ -439,21 +499,31 @@ static int bus_write_auth(sd_bus *b) {
}
static int bus_auth_verify(sd_bus *b) {
- char *e, *f;
+ char *e, *f, *start;
sd_id128_t peer;
unsigned i;
int r;
- /* We expect two response lines: "OK", "AGREE_UNIX_FD", and
- * that's it */
+ /* We expect two response lines: "OK" and possibly
+ * "AGREE_UNIX_FD" */
e = memmem(b->rbuffer, b->rbuffer_size, "\r\n", 2);
if (!e)
return 0;
- f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2);
- if (!f)
- return 0;
+ if (b->negotiate_fds) {
+ f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2);
+ if (!f)
+ return 0;
+
+ start = f + 2;
+ } else {
+ f = NULL;
+ start = e + 2;
+ }
+
+ /* Nice! We got all the lines we need. First check the OK
+ * line */
if (e - (char*) b->rbuffer != 3 + 32)
return -EPERM;
@@ -479,12 +549,15 @@ static int bus_auth_verify(sd_bus *b) {
b->peer = peer;
- b->can_fds =
- (f - e == sizeof("\r\nAGREE_UNIX_FD") - 1) &&
- memcmp(e + 2, "AGREE_UNIX_FD", sizeof("AGREE_UNIX_FD") - 1) == 0;
+ /* And possibly check the second line, too */
+
+ if (f)
+ b->can_fds =
+ (f - e == sizeof("\r\nAGREE_UNIX_FD") - 1) &&
+ memcmp(e + 2, "AGREE_UNIX_FD", sizeof("AGREE_UNIX_FD") - 1) == 0;
- b->rbuffer_size -= (f + 2 - (char*) b->rbuffer);
- memmove(b->rbuffer, f + 2, b->rbuffer_size);
+ b->rbuffer_size -= (start - (char*) b->rbuffer);
+ memmove(b->rbuffer, start, b->rbuffer_size);
r = bus_start_running(b);
if (r < 0)
@@ -564,10 +637,12 @@ static int bus_setup_fd(sd_bus *b) {
static int bus_start_auth(sd_bus *b) {
static const char auth_prefix[] = "\0AUTH EXTERNAL ";
- static const char auth_suffix[] = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n";
+ static const char auth_suffix_with_unix_fd[] = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n";
+ static const char auth_suffix_without_unix_fd[] = "\r\nBEGIN\r\n";
char text[20 + 1]; /* enough space for a 64bit integer plus NUL */
size_t l;
+ const char *auth_suffix;
assert(b);
@@ -581,12 +656,14 @@ static int bus_start_auth(sd_bus *b) {
if (!b->auth_uid)
return -ENOMEM;
+ auth_suffix = b->negotiate_fds ? auth_suffix_with_unix_fd : auth_suffix_without_unix_fd;
+
b->auth_iovec[0].iov_base = (void*) auth_prefix;
b->auth_iovec[0].iov_len = sizeof(auth_prefix) -1;
b->auth_iovec[1].iov_base = (void*) b->auth_uid;
b->auth_iovec[1].iov_len = l * 2;
b->auth_iovec[2].iov_base = (void*) auth_suffix;
- b->auth_iovec[2].iov_len = sizeof(auth_suffix) -1;
+ b->auth_iovec[2].iov_len = strlen(auth_suffix);
b->auth_size = sizeof(auth_prefix) - 1 + l * 2 + sizeof(auth_suffix) - 1;
return bus_write_auth(b);
@@ -640,6 +717,49 @@ static int bus_start_connect(sd_bus *b) {
}
}
+static int bus_start_fd(sd_bus *b) {
+ int r;
+
+ assert(b);
+
+ r = fd_nonblock(b->fd, true);
+ if (r < 0)
+ return r;
+
+ r = fd_cloexec(b->fd, true);
+ if (r < 0)
+ return r;
+
+ r = bus_setup_fd(b);
+ if (r < 0)
+ return r;
+
+ return bus_start_auth(b);
+}
+
+int sd_bus_start(sd_bus *bus) {
+ int r;
+
+ if (!bus)
+ return -EINVAL;
+ if (bus->state != BUS_UNSET)
+ return -EPERM;
+
+ bus->state = BUS_OPENING;
+
+ if (bus->fd >= 0)
+ r = bus_start_fd(bus);
+ else if (bus->address)
+ r = bus_start_connect(bus);
+ else
+ return -EINVAL;
+
+ if (r < 0)
+ return r;
+
+ return bus_send_hello(bus);
+}
+
int sd_bus_open_system(sd_bus **ret) {
const char *e;
sd_bus *b;
@@ -648,35 +768,33 @@ int sd_bus_open_system(sd_bus **ret) {
if (!ret)
return -EINVAL;
+ r = sd_bus_new(&b);
+ if (r < 0)
+ return r;
+
e = getenv("DBUS_SYSTEM_BUS_ADDRESS");
if (e) {
- r = sd_bus_open_address(e, &b);
+ r = sd_bus_set_address(b, e);
if (r < 0)
- return r;
+ goto fail;
} else {
- b = bus_new();
- if (!b)
- return -ENOMEM;
-
b->sockaddr.un.sun_family = AF_UNIX;
strncpy(b->sockaddr.un.sun_path, "/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/run/dbus/system_bus_socket") - 1;
-
- r = bus_start_connect(b);
- if (r < 0) {
- bus_free(b);
- return r;
- }
}
- r = bus_send_hello(b);
- if (r < 0) {
- sd_bus_unref(b);
- return r;
- }
+ b->send_hello = true;
+
+ r = sd_bus_start(b);
+ if (r < 0)
+ goto fail;
*ret = b;
return 0;
+
+fail:
+ bus_free(b);
+ return r;
}
int sd_bus_open_user(sd_bus **ret) {
@@ -688,102 +806,36 @@ int sd_bus_open_user(sd_bus **ret) {
if (!ret)
return -EINVAL;
+ r = sd_bus_new(&b);
+ if (r < 0)
+ return r;
+
e = getenv("DBUS_SESSION_BUS_ADDRESS");
if (e) {
- r = sd_bus_open_address(e, &b);
+ r = sd_bus_set_address(b, e);
if (r < 0)
- return r;
+ goto fail;
} else {
e = getenv("XDG_RUNTIME_DIR");
- if (!e)
- return -ENOENT;
+ if (!e) {
+ r = -ENOENT;
+ goto fail;
+ }
l = strlen(e);
- if (l + 4 > sizeof(b->sockaddr.un.sun_path))
- return -E2BIG;
-
- b = bus_new();
- if (!b)
- return -ENOMEM;
+ if (l + 4 > sizeof(b->sockaddr.un.sun_path)) {
+ r = -E2BIG;
+ goto fail;
+ }
b->sockaddr.un.sun_family = AF_UNIX;
memcpy(mempcpy(b->sockaddr.un.sun_path, e, l), "/bus", 4);
b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 4;
-
- r = bus_start_connect(b);
- if (r < 0) {
- bus_free(b);
- return r;
- }
}
- r = bus_send_hello(b);
- if (r < 0) {
- sd_bus_unref(b);
- return r;
- }
-
- *ret = b;
- return 0;
-}
-
-int sd_bus_open_address(const char *address, sd_bus **ret) {
- sd_bus *b;
- int r;
-
- if (!address)
- return -EINVAL;
- if (!ret)
- return -EINVAL;
-
- b = bus_new();
- if (!b)
- return -ENOMEM;
-
- b->address = strdup(address);
- if (!b->address) {
- bus_free(b);
- return -ENOMEM;
- }
-
- r = bus_start_connect(b);
- if (r < 0) {
- bus_free(b);
- return r;
- }
+ b->send_hello = true;
- *ret = b;
- return 0;
-}
-
-int sd_bus_open_fd(int fd, sd_bus **ret) {
- sd_bus *b;
- int r;
-
- if (fd < 0)
- return -EINVAL;
- if (!ret)
- return -EINVAL;
-
- b = bus_new();
- if (!b)
- return -ENOMEM;
-
- b->fd = fd;
-
- r = fd_nonblock(b->fd, true);
- if (r < 0)
- goto fail;
-
- fd_cloexec(b->fd, true);
- if (r < 0)
- goto fail;
-
- r = bus_setup_fd(b);
- if (r < 0)
- goto fail;
-
- r = bus_start_auth(b);
+ r = sd_bus_start(b);
if (r < 0)
goto fail;
@@ -791,7 +843,7 @@ int sd_bus_open_fd(int fd, sd_bus **ret) {
return 0;
fail:
- bus_free(b);
+ bus_free(b);
return r;
}
@@ -832,7 +884,7 @@ int sd_bus_is_open(sd_bus *bus) {
if (!bus)
return -EINVAL;
- return bus->fd >= 0;
+ return bus->state != BUS_UNSET && bus->fd >= 0;
}
int sd_bus_can_send(sd_bus *bus, char type) {
@@ -840,8 +892,13 @@ int sd_bus_can_send(sd_bus *bus, char type) {
if (!bus)
return -EINVAL;
+ if (bus->fd < 0)
+ return -ENOTCONN;
if (type == SD_BUS_TYPE_UNIX_FD) {
+ if (!bus->negotiate_fds)
+ return 0;
+
r = bus_ensure_running(bus);
if (r < 0)
return r;
@@ -1191,12 +1248,20 @@ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) {
if (!bus)
return -EINVAL;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (bus->fd < 0)
return -ENOTCONN;
if (!m)
return -EINVAL;
- if (m->n_fds > 0 && !bus->can_fds)
- return -ENOTSUP;
+
+ if (m->n_fds > 0) {
+ r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ENOTSUP;
+ }
/* If the serial number isn't kept, then we know that no reply
* is expected */
@@ -1292,6 +1357,8 @@ int sd_bus_send_with_reply(
if (!bus)
return -EINVAL;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (bus->fd < 0)
return -ENOTCONN;
if (!m)
@@ -1374,6 +1441,11 @@ int bus_ensure_running(sd_bus *bus) {
assert(bus);
+ if (bus->fd < 0)
+ return -ENOTCONN;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
+
if (bus->state == BUS_RUNNING)
return 1;
@@ -1408,6 +1480,8 @@ int sd_bus_send_with_reply_and_block(
return -EINVAL;
if (bus->fd < 0)
return -ENOTCONN;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (!m)
return -EINVAL;
if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
@@ -1526,6 +1600,8 @@ int sd_bus_get_events(sd_bus *bus) {
if (!bus)
return -EINVAL;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (bus->fd < 0)
return -ENOTCONN;
@@ -1555,6 +1631,8 @@ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
return -EINVAL;
if (!timeout_usec)
return -EINVAL;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (bus->fd < 0)
return -ENOTCONN;
@@ -1782,6 +1860,8 @@ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
if (!bus)
return -EINVAL;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (bus->fd < 0)
return -ENOTCONN;
@@ -1938,6 +2018,8 @@ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
if (!bus)
return -EINVAL;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (bus->fd < 0)
return -ENOTCONN;
if (bus->rqueue_size > 0)
@@ -1951,6 +2033,8 @@ int sd_bus_flush(sd_bus *bus) {
if (!bus)
return -EINVAL;
+ if (bus->state == BUS_UNSET)
+ return -ENOTCONN;
if (bus->fd < 0)
return -ENOTCONN;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-14 10:26:50 +0000