bus: parse uid/gid/pid/tid meta data from kdbus messages

[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 5b5a731233150a1380d52fb01b3a0f532f4004a4..bce81aeffce1b8c9584bf178b20f651ac1ba1a27 100644 (file)
--- a/src/libsystemd-bus/bus-socket.c
+++ b/src/libsystemd-bus/bus-socket.c
@@ -58,6 +58,39 @@ static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) {
         }
 }
 
+static void 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++;
+}
+
+static void bus_message_setup_iovec(sd_bus_message *m) {
+        assert(m);
+        assert(m->sealed);
+
+        if (m->n_iovec > 0)
+                return;
+
+        append_iovec(m, m->header, sizeof(*m->header));
+
+        if (m->fields) {
+                append_iovec(m, m->fields, m->header->fields_size);
+
+                if (m->header->fields_size % 8 != 0) {
+                        static const uint8_t padding[7] = {};
+
+                        append_iovec(m, padding, 8 - (m->header->fields_size % 8));
+                }
+        }
+
+        if (m->body)
+                append_iovec(m, m->body, m->header->body_size);
+}
+
 bool bus_socket_auth_needs_write(sd_bus *b) {
 
         unsigned i;
@@ -455,7 +488,7 @@ static int bus_socket_read_auth(sd_bus *b) {
         if (r != 0)
                 return r;
 
-        n = MAX(256, b->rbuffer_size * 2);
+        n = MAX(256u, b->rbuffer_size * 2);
 
         if (n > BUS_AUTH_SIZE_MAX)
                 n = BUS_AUTH_SIZE_MAX;
@@ -729,9 +762,11 @@ int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
         assert(idx);
         assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
 
-        if (*idx >= m->size)
+        if (*idx >= BUS_MESSAGE_SIZE(m))
                 return 0;
 
+        bus_message_setup_iovec(m);
+
         n = m->n_iovec * sizeof(struct iovec);
         iov = alloca(n);
         memcpy(iov, m->iovec, n);
@@ -877,7 +912,7 @@ 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);
@@ -986,16 +1021,14 @@ int bus_socket_read_message(sd_bus *bus, sd_bus_message **m) {
 int bus_socket_process_opening(sd_bus *b) {
         int error = 0;
         socklen_t slen = sizeof(error);
-        struct pollfd p;
+        struct pollfd p = {
+                .fd = b->output_fd,
+                .events = POLLOUT,
+        };
         int r;
 
-        assert(b);
         assert(b->state == BUS_OPENING);
 
-        zero(p);
-        p.fd = b->output_fd;
-        p.events = POLLOUT;
-
         r = poll(&p, 1, 0);
         if (r < 0)
                 return -errno;