bus: make optional whether unix socket passing is negotiated and whether hello is sent

This alos gets rid of explicit sd_open_fd() and sd_open_address()
constructors in favour of sd_new() + sd_new_start() where the
negotiation parameters may be set it in between.
This commit is contained in:
Lennart Poettering 2013-03-24 23:55:03 +01:00
parent 66f931b4c8
commit 021a1e78d7
4 changed files with 226 additions and 127 deletions

View File

@ -57,6 +57,7 @@ struct object_callback {
};
enum bus_state {
BUS_UNSET,
BUS_OPENING,
BUS_AUTHENTICATING,
BUS_HELLO,
@ -68,8 +69,10 @@ struct sd_bus {
enum bus_state state;
int fd;
int message_version;
bool negotiate_fds:1;
bool can_fds:1;
bool sent_hello:1;
bool send_hello:1;
bool ucred_valid:1;
void *rbuffer;

View File

@ -331,7 +331,7 @@ static sd_bus_message *message_new(sd_bus *bus, uint8_t type) {
m->header->endian = SD_BUS_NATIVE_ENDIAN;
m->header->type = type;
m->header->version = bus ? bus->message_version : 1;
m->allow_fds = !bus || bus->can_fds;
m->allow_fds = !bus || bus->can_fds || (bus->state != BUS_HELLO && bus->state != BUS_RUNNING);
return m;
}
@ -354,6 +354,8 @@ int sd_bus_message_new_signal(
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, SD_BUS_MESSAGE_TYPE_SIGNAL);
if (!t)
@ -396,6 +398,8 @@ int sd_bus_message_new_method_call(
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, SD_BUS_MESSAGE_TYPE_METHOD_CALL);
if (!t)
@ -445,6 +449,8 @@ static int message_new_reply(
return -EINVAL;
if (!m)
return -EINVAL;
if (bus && bus->state == BUS_UNSET)
return -ENOTCONN;
t = message_new(bus, type);
if (!t)

View File

@ -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 */
b->rbuffer_size -= (f + 2 - (char*) b->rbuffer);
memmove(b->rbuffer, f + 2, b->rbuffer_size);
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 -= (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;
}
b->send_hello = true;
*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;
}
*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;

View File

@ -53,8 +53,14 @@ typedef int (*sd_message_handler_t)(sd_bus *bus, int ret, sd_bus_message *m, voi
int sd_bus_open_system(sd_bus **ret);
int sd_bus_open_user(sd_bus **ret);
int sd_bus_open_address(const char *address, sd_bus **ret);
int sd_bus_open_fd(int fd, sd_bus **ret);
int sd_bus_new(sd_bus **ret);
int sd_bus_set_address(sd_bus *bus, const char *address);
int sd_bus_set_fd(sd_bus *bus, int fd);
int sd_bus_set_hello(sd_bus *bus, int b);
int sd_bus_set_negotiate_fds(sd_bus *bus, int b);
int sd_bus_start(sd_bus *ret);
void sd_bus_close(sd_bus *bus);
sd_bus *sd_bus_ref(sd_bus *bus);