bus: add the ability for backends to queue to input messages at the same time

[elogind.git] / src / libsystemd-bus / bus-socket.c

diff --git a/src/libsystemd-bus/bus-socket.c b/src/libsystemd-bus/bus-socket.c
index 145f454d5d3cdcbe5d3c4e0eb7c556f8fa6a1a2a..355f31c56251ddbec613dbaeb4b4e37b5c72e620 100644 (file)
--- a/src/libsystemd-bus/bus-socket.c
+++ b/src/libsystemd-bus/bus-socket.c
@@ -58,6 +58,65 @@ static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) {
         }
 }
 
+static int append_iovec(sd_bus_message *m, const void *p, size_t sz) {
+        assert(m);
+        assert(p);
+        assert(sz > 0);
+
+        m->iovec[m->n_iovec].iov_base = (void*) p;
+        m->iovec[m->n_iovec].iov_len = sz;
+        m->n_iovec++;
+
+        return 0;
+}
+
+static int bus_message_setup_iovec(sd_bus_message *m) {
+        struct bus_body_part *part;
+        unsigned n, i;
+        int r;
+
+        assert(m);
+        assert(m->sealed);
+
+        if (m->n_iovec > 0)
+                return 0;
+
+        assert(!m->iovec);
+
+        n = 1 + m->n_body_parts;
+        if (n < ELEMENTSOF(m->iovec_fixed))
+                m->iovec = m->iovec_fixed;
+        else {
+                m->iovec = new(struct iovec, n);
+                if (!m->iovec) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+        }
+
+        r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m));
+        if (r < 0)
+                goto fail;
+
+        MESSAGE_FOREACH_PART(part, i, m)  {
+                r = bus_body_part_map(part);
+                if (r < 0)
+                        goto fail;
+
+                r = append_iovec(m, part->data, part->size);
+                if (r < 0)
+                        goto fail;
+        }
+
+        assert(n == m->n_iovec);
+
+        return 0;
+
+fail:
+        m->poisoned = true;
+        return r;
+}
+
 bool bus_socket_auth_needs_write(sd_bus *b) {
 
         unsigned i;
@@ -122,7 +181,7 @@ static int bus_socket_auth_verify_client(sd_bus *b) {
         if (!e)
                 return 0;
 
-        if (b->negotiate_fds) {
+        if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD) {
                 f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2);
                 if (!f)
                         return 0;
@@ -405,7 +464,7 @@ static int bus_socket_auth_verify_server(sd_bus *b) {
                                         r = bus_socket_auth_write_ok(b);
                         }
                 } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) {
-                        if (b->auth == _BUS_AUTH_INVALID || !b->negotiate_fds)
+                        if (b->auth == _BUS_AUTH_INVALID || !(b->hello_flags & KDBUS_HELLO_ACCEPT_FD))
                                 r = bus_socket_auth_write(b, "ERROR\r\n");
                         else {
                                 b->can_fds = true;
@@ -541,7 +600,7 @@ static int bus_socket_read_auth(sd_bus *b) {
         return 1;
 }
 
-static int bus_socket_setup(sd_bus *b) {
+int bus_socket_setup(sd_bus *b) {
         int enable;
         socklen_t l;
 
@@ -551,6 +610,8 @@ static int bus_socket_setup(sd_bus *b) {
          * socket, just in case. */
         enable = !b->bus_client;
         setsockopt(b->input_fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable));
+
+        enable = !b->bus_client && (b->attach_flags & KDBUS_ATTACH_SECLABEL);
         setsockopt(b->input_fd, SOL_SOCKET, SO_PASSSEC, &enable, sizeof(enable));
 
         /* Increase the buffers to a MB */
@@ -592,7 +653,7 @@ static int bus_socket_start_auth_client(sd_bus *b) {
         if (!b->auth_buffer)
                 return -ENOMEM;
 
-        if (b->negotiate_fds)
+        if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD)
                 auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n";
         else
                 auth_suffix = "\r\nBEGIN\r\n";
@@ -607,18 +668,18 @@ static int bus_socket_start_auth_client(sd_bus *b) {
         return bus_socket_write_auth(b);
 }
 
-static int bus_socket_start_auth(sd_bus *b) {
+int bus_socket_start_auth(sd_bus *b) {
         assert(b);
 
         b->state = BUS_AUTHENTICATING;
         b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT;
 
         if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0)
-                b->negotiate_fds = false;
+                b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD;
 
         if (b->output_fd != b->input_fd)
                 if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0)
-                        b->negotiate_fds = false;
+                        b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD;
 
         if (b->is_server)
                 return bus_socket_read_auth(b);
@@ -723,15 +784,20 @@ int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
         ssize_t k;
         size_t n;
         unsigned j;
+        int r;
 
         assert(bus);
         assert(m);
         assert(idx);
         assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
 
-        if (*idx >= m->size)
+        if (*idx >= BUS_MESSAGE_SIZE(m))
                 return 0;
 
+        r = bus_message_setup_iovec(m);
+        if (r < 0)
+                return r;
+
         n = m->n_iovec * sizeof(struct iovec);
         iov = alloca(n);
         memcpy(iov, m->iovec, n);
@@ -825,13 +891,12 @@ static int bus_socket_read_message_need(sd_bus *bus, size_t *need) {
         return 0;
 }
 
-static int bus_socket_make_message(sd_bus *bus, size_t size, sd_bus_message **m) {
+static int bus_socket_make_message(sd_bus *bus, size_t size) {
         sd_bus_message *t;
         void *b;
         int r;
 
         assert(bus);
-        assert(m);
         assert(bus->rbuffer_size >= size);
         assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
 
@@ -843,7 +908,8 @@ static int bus_socket_make_message(sd_bus *bus, size_t size, sd_bus_message **m)
         } else
                 b = NULL;
 
-        r = bus_message_from_malloc(bus->rbuffer, size,
+        r = bus_message_from_malloc(bus,
+                                    bus->rbuffer, size,
                                     bus->fds, bus->n_fds,
                                     bus->ucred_valid ? &bus->ucred : NULL,
                                     bus->label[0] ? bus->label : NULL,
@@ -859,11 +925,16 @@ static int bus_socket_make_message(sd_bus *bus, size_t size, sd_bus_message **m)
         bus->fds = NULL;
         bus->n_fds = 0;
 
-        *m = t;
+        r = bus_rqueue_push(bus, t);
+        if (r < 0) {
+                sd_bus_message_unref(t);
+                return r;
+        }
+
         return 1;
 }
 
-int bus_socket_read_message(sd_bus *bus, sd_bus_message **m) {
+int bus_socket_read_message(sd_bus *bus) {
         struct msghdr mh;
         struct iovec iov;
         ssize_t k;
@@ -877,18 +948,21 @@ int bus_socket_read_message(sd_bus *bus, sd_bus_message **m) {
                             CMSG_SPACE(NAME_MAX)]; /*selinux label */
         } control;
         struct cmsghdr *cmsg;
-        bool handle_cmsg;
+        bool handle_cmsg = false;
 
         assert(bus);
-        assert(m);
         assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
 
+        r = bus_rqueue_make_room(bus, 1);
+        if (r < 0)
+                return r;
+
         r = bus_socket_read_message_need(bus, &need);
         if (r < 0)
                 return r;
 
         if (bus->rbuffer_size >= need)
-                return bus_socket_make_message(bus, need, m);
+                return bus_socket_make_message(bus, need);
 
         b = realloc(bus->rbuffer, need);
         if (!b)
@@ -978,7 +1052,7 @@ int bus_socket_read_message(sd_bus *bus, sd_bus_message **m) {
                 return r;
 
         if (bus->rbuffer_size >= need)
-                return bus_socket_make_message(bus, need, m);
+                return bus_socket_make_message(bus, need);
 
         return 1;
 }