chiark / gitweb /
unit: use the UNIT() macro consistently
[elogind.git] / src / socket.c
index 01af34c1052585736dcd89406bdb874f2663c077..e0ddcef1b3710edd2a5c692a38deac50da8a862a 100644 (file)
@@ -27,6 +27,7 @@
 #include <sys/epoll.h>
 #include <signal.h>
 #include <arpa/inet.h>
+#include <mqueue.h>
 
 #include "unit.h"
 #include "socket.h"
@@ -63,12 +64,12 @@ static void socket_init(Unit *u) {
         Socket *s = SOCKET(u);
 
         assert(u);
-        assert(u->meta.load_state == UNIT_STUB);
+        assert(u->load_state == UNIT_STUB);
 
         s->backlog = SOMAXCONN;
         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
         s->directory_mode = 0755;
-        s->socket_mode = 0777;
+        s->socket_mode = 0666;
 
         s->max_connections = 64;
 
@@ -78,8 +79,8 @@ static void socket_init(Unit *u) {
         s->mark = -1;
 
         exec_context_init(&s->exec_context);
-        s->exec_context.std_output = u->meta.manager->default_std_output;
-        s->exec_context.std_error = u->meta.manager->default_std_error;
+        s->exec_context.std_output = u->manager->default_std_output;
+        s->exec_context.std_error = u->manager->default_std_error;
 
         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 }
@@ -97,7 +98,6 @@ static void socket_unwatch_control_pid(Socket *s) {
 static void socket_done(Unit *u) {
         Socket *s = SOCKET(u);
         SocketPort *p;
-        Meta *i;
 
         assert(s);
 
@@ -119,7 +119,7 @@ static void socket_done(Unit *u) {
 
         socket_unwatch_control_pid(s);
 
-        s->service = NULL;
+        unit_ref_unset(&s->service);
 
         free(s->tcp_congestion);
         s->tcp_congestion = NULL;
@@ -128,16 +128,6 @@ static void socket_done(Unit *u) {
         s->bind_to_device = NULL;
 
         unit_unwatch_timer(u, &s->timer_watch);
-
-        /* Make sure no service instance refers to us anymore. */
-        LIST_FOREACH(units_per_type, i, u->meta.manager->units_per_type[UNIT_SERVICE]) {
-                Service *service = (Service *) i;
-
-                if (service->accept_socket == s)
-                        service->accept_socket = NULL;
-
-                set_remove(service->configured_sockets, s);
-        }
 }
 
 static int socket_instantiate_service(Socket *s) {
@@ -152,12 +142,12 @@ static int socket_instantiate_service(Socket *s) {
          * here. For Accept=no this is mostly a NOP since the service
          * is figured out at load time anyway. */
 
-        if (s->service)
+        if (UNIT_DEREF(s->service))
                 return 0;
 
         assert(s->accept);
 
-        if (!(prefix = unit_name_to_prefix(s->meta.id)))
+        if (!(prefix = unit_name_to_prefix(UNIT(s)->id)))
                 return -ENOMEM;
 
         r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
@@ -166,7 +156,7 @@ static int socket_instantiate_service(Socket *s) {
         if (r < 0)
                 return -ENOMEM;
 
-        r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u);
+        r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
         free(name);
 
         if (r < 0)
@@ -179,9 +169,10 @@ static int socket_instantiate_service(Socket *s) {
         }
 #endif
 
-        u->meta.no_gc = true;
-        s->service = SERVICE(u);
-        return 0;
+        u->no_gc = true;
+        unit_ref_set(&s->service, u);
+
+        return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false);
 }
 
 static bool have_non_accept_socket(Socket *s) {
@@ -207,31 +198,31 @@ static bool have_non_accept_socket(Socket *s) {
 static int socket_verify(Socket *s) {
         assert(s);
 
-        if (s->meta.load_state != UNIT_LOADED)
+        if (UNIT(s)->load_state != UNIT_LOADED)
                 return 0;
 
         if (!s->ports) {
-                log_error("%s lacks Listen setting. Refusing.", s->meta.id);
+                log_error("%s lacks Listen setting. Refusing.", UNIT(s)->id);
                 return -EINVAL;
         }
 
         if (s->accept && have_non_accept_socket(s)) {
-                log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id);
+                log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", UNIT(s)->id);
                 return -EINVAL;
         }
 
         if (s->accept && s->max_connections <= 0) {
-                log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id);
+                log_error("%s's MaxConnection setting too small. Refusing.", UNIT(s)->id);
                 return -EINVAL;
         }
 
-        if (s->accept && s->service) {
-                log_error("Explicit service configuration for accepting sockets not supported on %s. Refusing.", s->meta.id);
+        if (s->accept && UNIT_DEREF(s->service)) {
+                log_error("Explicit service configuration for accepting sockets not supported on %s. Refusing.", UNIT(s)->id);
                 return -EINVAL;
         }
 
         if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
-                log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
+                log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id);
                 return -EINVAL;
         }
 
@@ -248,8 +239,7 @@ static bool socket_needs_mount(Socket *s, const char *prefix) {
                 if (p->type == SOCKET_SOCKET) {
                         if (socket_address_needs_mount(&p->address, prefix))
                                 return true;
-                } else {
-                        assert(p->type == SOCKET_FIFO);
+                } else if (p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL) {
                         if (path_startswith(p->path, prefix))
                                 return true;
                 }
@@ -264,8 +254,8 @@ int socket_add_one_mount_link(Socket *s, Mount *m) {
         assert(s);
         assert(m);
 
-        if (s->meta.load_state != UNIT_LOADED ||
-            m->meta.load_state != UNIT_LOADED)
+        if (UNIT(s)->load_state != UNIT_LOADED ||
+            UNIT(m)->load_state != UNIT_LOADED)
                 return 0;
 
         if (!socket_needs_mount(s, m->where))
@@ -278,12 +268,12 @@ int socket_add_one_mount_link(Socket *s, Mount *m) {
 }
 
 static int socket_add_mount_links(Socket *s) {
-        Meta *other;
+        Unit *other;
         int r;
 
         assert(s);
 
-        LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
+        LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT])
                 if ((r = socket_add_one_mount_link(s, (Mount*) other)) < 0)
                         return r;
 
@@ -312,7 +302,7 @@ static int socket_add_default_dependencies(Socket *s) {
         int r;
         assert(s);
 
-        if (s->meta.manager->running_as == MANAGER_SYSTEM) {
+        if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
                 if ((r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true)) < 0)
                         return r;
 
@@ -323,26 +313,44 @@ static int socket_add_default_dependencies(Socket *s) {
         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 }
 
+static bool socket_has_exec(Socket *s) {
+        unsigned i;
+        assert(s);
+
+        for (i = 0; i < _SOCKET_EXEC_COMMAND_MAX; i++)
+                if (s->exec_command[i])
+                        return true;
+
+        return false;
+}
+
 static int socket_load(Unit *u) {
         Socket *s = SOCKET(u);
         int r;
 
         assert(u);
-        assert(u->meta.load_state == UNIT_STUB);
+        assert(u->load_state == UNIT_STUB);
 
         if ((r = unit_load_fragment_and_dropin(u)) < 0)
                 return r;
 
         /* This is a new unit? Then let's add in some extras */
-        if (u->meta.load_state == UNIT_LOADED) {
+        if (u->load_state == UNIT_LOADED) {
 
                 if (have_non_accept_socket(s)) {
 
-                        if (!s->service)
-                                if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0)
+                        if (!UNIT_DEREF(s->service)) {
+                                Unit *x;
+
+                                r = unit_load_related_unit(u, ".service", &x);
+                                if (r < 0)
                                         return r;
 
-                        if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0)
+                                unit_ref_set(&s->service, x);
+                        }
+
+                        r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true);
+                        if (r < 0)
                                 return r;
                 }
 
@@ -352,13 +360,14 @@ static int socket_load(Unit *u) {
                 if ((r = socket_add_device_link(s)) < 0)
                         return r;
 
-                if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
-                        return r;
+                if (socket_has_exec(s))
+                        if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
+                                return r;
 
                 if ((r = unit_add_default_cgroups(u)) < 0)
                         return r;
 
-                if (s->meta.default_dependencies)
+                if (UNIT(s)->default_dependencies)
                         if ((r = socket_add_default_dependencies(s)) < 0)
                                 return r;
         }
@@ -404,6 +413,9 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                 "%sDirectoryMode: %04o\n"
                 "%sKeepAlive: %s\n"
                 "%sFreeBind: %s\n"
+                "%sTransparent: %s\n"
+                "%sBroadcast: %s\n"
+                "%sPassCrededentials: %s\n"
                 "%sTCPCongestion: %s\n",
                 prefix, socket_state_to_string(s->state),
                 prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
@@ -412,6 +424,9 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                 prefix, s->directory_mode,
                 prefix, yes_no(s->keep_alive),
                 prefix, yes_no(s->free_bind),
+                prefix, yes_no(s->transparent),
+                prefix, yes_no(s->broadcast),
+                prefix, yes_no(s->pass_cred),
                 prefix, strna(s->tcp_congestion));
 
         if (s->control_pid > 0)
@@ -468,6 +483,16 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                         "%sMark: %i\n",
                         prefix, s->mark);
 
+        if (s->mq_maxmsg > 0)
+                fprintf(f,
+                        "%sMessageQueueMaxMessages: %li\n",
+                        prefix, s->mq_maxmsg);
+
+        if (s->mq_msgsize > 0)
+                fprintf(f,
+                        "%sMessageQueueMessageSize: %li\n",
+                        prefix, s->mq_msgsize);
+
         LIST_FOREACH(port, p, s->ports) {
 
                 if (p->type == SOCKET_SOCKET) {
@@ -482,7 +507,11 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 
                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
                         free(k);
-                } else
+                } else if (p->type == SOCKET_SPECIAL)
+                        fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
+                else if (p->type == SOCKET_MQUEUE)
+                        fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
+                else
                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
         }
 
@@ -633,20 +662,32 @@ static void socket_apply_socket_options(Socket *s, int fd) {
                         log_warning("SO_KEEPALIVE failed: %m");
         }
 
+        if (s->broadcast) {
+                int one = 1;
+                if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
+                        log_warning("SO_BROADCAST failed: %m");
+        }
+
+        if (s->pass_cred) {
+                int one = 1;
+                if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
+                        log_warning("SO_PASSCRED failed: %m");
+        }
+
         if (s->priority >= 0)
                 if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0)
                         log_warning("SO_PRIORITY failed: %m");
 
         if (s->receive_buffer > 0) {
                 int value = (int) s->receive_buffer;
-                if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
-                        log_warning("SO_RCVBUF failed: %m");
+                if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
+                        log_warning("SO_RCVBUFFORCE failed: %m");
         }
 
         if (s->send_buffer > 0) {
                 int value = (int) s->send_buffer;
-                if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
-                        log_warning("SO_SNDBUF failed: %m");
+                if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
+                        log_warning("SO_SNDBUFFORCE failed: %m");
         }
 
         if (s->mark >= 0)
@@ -687,7 +728,6 @@ static void socket_apply_fifo_options(Socket *s, int fd) {
                         log_warning("F_SETPIPE_SZ: %m");
 }
 
-
 static int fifo_address_create(
                 const char *path,
                 mode_t directory_mode,
@@ -715,7 +755,7 @@ static int fifo_address_create(
         r = mkfifo(path, socket_mode);
         umask(old_mask);
 
-        if (r < 0) {
+        if (r < 0 && errno != EEXIST) {
                 r = -errno;
                 goto fail;
         }
@@ -753,6 +793,102 @@ fail:
         return r;
 }
 
+static int special_address_create(
+                const char *path,
+                int *_fd) {
+
+        int fd = -1, r = 0;
+        struct stat st;
+
+        assert(path);
+        assert(_fd);
+
+        if ((fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        if (fstat(fd, &st) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        /* Check whether this is a /proc, /sys or /dev file or char device */
+        if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
+                r = -EEXIST;
+                goto fail;
+        }
+
+        *_fd = fd;
+        return 0;
+
+fail:
+        if (fd >= 0)
+                close_nointr_nofail(fd);
+
+        return r;
+}
+
+static int mq_address_create(
+                const char *path,
+                mode_t mq_mode,
+                long maxmsg,
+                long msgsize,
+                int *_fd) {
+
+        int fd = -1, r = 0;
+        struct stat st;
+        mode_t old_mask;
+        struct mq_attr _attr, *attr = NULL;
+
+        assert(path);
+        assert(_fd);
+
+        if (maxmsg > 0 && msgsize > 0) {
+                zero(_attr);
+                _attr.mq_flags = O_NONBLOCK;
+                _attr.mq_maxmsg = maxmsg;
+                _attr.mq_msgsize = msgsize;
+                attr = &_attr;
+        }
+
+        /* Enforce the right access mode for the mq */
+        old_mask = umask(~ mq_mode);
+
+        /* Include the original umask in our mask */
+        umask(~mq_mode | old_mask);
+
+        fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr);
+        umask(old_mask);
+
+        if (fd < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        if (fstat(fd, &st) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        if ((st.st_mode & 0777) != (mq_mode & ~old_mask) ||
+            st.st_uid != getuid() ||
+            st.st_gid != getgid()) {
+
+                r = -EEXIST;
+                goto fail;
+        }
+
+        *_fd = fd;
+        return 0;
+
+fail:
+        if (fd >= 0)
+                close_nointr_nofail(fd);
+
+        return r;
+}
+
 static int socket_open_fds(Socket *s) {
         SocketPort *p;
         int r;
@@ -773,11 +909,15 @@ static int socket_open_fds(Socket *s) {
                                 if ((r = socket_instantiate_service(s)) < 0)
                                         return r;
 
-                                if (s->service && s->service->exec_command[SERVICE_EXEC_START])
-                                        if ((r = label_get_socket_label_from_exe(s->service->exec_command[SERVICE_EXEC_START]->path, &label)) < 0) {
+                                if (UNIT_DEREF(s->service) &&
+                                    SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]) {
+                                        r = label_get_create_label_from_exe(SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]->path, &label);
+
+                                        if (r < 0) {
                                                 if (r != -EPERM)
                                                         return r;
                                         }
+                                }
 
                                 know_label = true;
                         }
@@ -788,6 +928,7 @@ static int socket_open_fds(Socket *s) {
                                              s->bind_ipv6_only,
                                              s->bind_to_device,
                                              s->free_bind,
+                                             s->transparent,
                                              s->directory_mode,
                                              s->socket_mode,
                                              label,
@@ -796,6 +937,13 @@ static int socket_open_fds(Socket *s) {
 
                         socket_apply_socket_options(s, p->fd);
 
+                } else  if (p->type == SOCKET_SPECIAL) {
+
+                        if ((r = special_address_create(
+                                             p->path,
+                                             &p->fd)) < 0)
+                                goto rollback;
+
                 } else  if (p->type == SOCKET_FIFO) {
 
                         if ((r = fifo_address_create(
@@ -806,7 +954,15 @@ static int socket_open_fds(Socket *s) {
                                 goto rollback;
 
                         socket_apply_fifo_options(s, p->fd);
+                } else if (p->type == SOCKET_MQUEUE) {
 
+                        if ((r = mq_address_create(
+                                             p->path,
+                                             s->socket_mode,
+                                             s->mq_maxmsg,
+                                             s->mq_msgsize,
+                                             &p->fd)) < 0)
+                                goto rollback;
                 } else
                         assert_not_reached("Unknown port type");
         }
@@ -893,7 +1049,7 @@ static void socket_set_state(Socket *s, SocketState state) {
 
         if (state != old_state)
                 log_debug("%s changed %s -> %s",
-                          s->meta.id,
+                          UNIT(s)->id,
                           socket_state_to_string(old_state),
                           socket_state_to_string(state));
 
@@ -968,12 +1124,13 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
                        argv,
                        &s->exec_context,
                        NULL, 0,
-                       s->meta.manager->environment,
+                       UNIT(s)->manager->environment,
                        true,
                        true,
                        true,
-                       s->meta.manager->confirm_spawn,
-                       s->meta.cgroup_bondings,
+                       UNIT(s)->manager->confirm_spawn,
+                       UNIT(s)->cgroup_bondings,
+                       UNIT(s)->cgroup_attributes,
                        &pid);
 
         strv_free(argv);
@@ -1027,7 +1184,7 @@ static void socket_enter_stop_post(Socket *s, bool success) {
         return;
 
 fail:
-        log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
+        log_warning("%s failed to run 'stop-post' task: %s", UNIT(s)->id, strerror(-r));
         socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
 }
 
@@ -1064,7 +1221,7 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) {
                                 if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
                                         goto fail;
 
-                        if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
+                        if ((r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, pid_set)) < 0) {
                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
                                         log_warning("Failed to kill control group: %s", strerror(-r));
                         } else if (r > 0)
@@ -1088,7 +1245,7 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) {
         return;
 
 fail:
-        log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
+        log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
 
         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
                 socket_enter_stop_post(s, false);
@@ -1121,7 +1278,7 @@ static void socket_enter_stop_pre(Socket *s, bool success) {
         return;
 
 fail:
-        log_warning("%s failed to run 'stop-pre' task: %s", s->meta.id, strerror(-r));
+        log_warning("%s failed to run 'stop-pre' task: %s", UNIT(s)->id, strerror(-r));
         socket_enter_stop_post(s, false);
 }
 
@@ -1130,7 +1287,7 @@ static void socket_enter_listening(Socket *s) {
         assert(s);
 
         if ((r = socket_watch_fds(s)) < 0) {
-                log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
+                log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
                 goto fail;
         }
 
@@ -1146,7 +1303,7 @@ static void socket_enter_start_post(Socket *s) {
         assert(s);
 
         if ((r = socket_open_fds(s)) < 0) {
-                log_warning("%s failed to listen on sockets: %s", s->meta.id, strerror(-r));
+                log_warning("%s failed to listen on sockets: %s", UNIT(s)->id, strerror(-r));
                 goto fail;
         }
 
@@ -1156,7 +1313,7 @@ static void socket_enter_start_post(Socket *s) {
 
         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
-                        log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
+                        log_warning("%s failed to run 'start-post' task: %s", UNIT(s)->id, strerror(-r));
                         goto fail;
                 }
 
@@ -1189,7 +1346,7 @@ static void socket_enter_start_pre(Socket *s) {
         return;
 
 fail:
-        log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
+        log_warning("%s failed to run 'start-pre' task: %s", UNIT(s)->id, strerror(-r));
         socket_enter_dead(s, false);
 }
 
@@ -1203,7 +1360,7 @@ static void socket_enter_running(Socket *s, int cfd) {
         /* We don't take connections anymore if we are supposed to
          * shut down anyway */
         if (unit_pending_inactive(UNIT(s))) {
-                log_debug("Suppressing connection request on %s since unit stop is scheduled.", s->meta.id);
+                log_debug("Suppressing connection request on %s since unit stop is scheduled.", UNIT(s)->id);
 
                 if (cfd >= 0)
                         close_nointr_nofail(cfd);
@@ -1212,7 +1369,7 @@ static void socket_enter_running(Socket *s, int cfd) {
                         socket_close_fds(s);
 
                         if ((r = socket_watch_fds(s)) < 0) {
-                                log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r));
+                                log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
                                 socket_enter_stop_pre(s, false);
                         }
                 }
@@ -1221,26 +1378,20 @@ static void socket_enter_running(Socket *s, int cfd) {
         }
 
         if (cfd < 0) {
+                Iterator i;
+                Unit *u;
                 bool pending = false;
-                Meta *i;
 
                 /* If there's already a start pending don't bother to
                  * do anything */
-                LIST_FOREACH(units_per_type, i, s->meta.manager->units_per_type[UNIT_SERVICE]) {
-                        Service *service = (Service *) i;
-
-                        if (!set_get(service->configured_sockets, s))
-                                continue;
-
-                        if (!unit_pending_active(UNIT(service)))
-                                continue;
-
-                        pending = true;
-                        break;
-                }
+                SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
+                        if (unit_pending_active(u)) {
+                                pending = true;
+                                break;
+                        }
 
                 if (!pending)
-                        if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
+                        if ((r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, true, &error, NULL)) < 0)
                                 goto fail;
 
                 socket_set_state(s, SOCKET_RUNNING);
@@ -1260,7 +1411,7 @@ static void socket_enter_running(Socket *s, int cfd) {
                 if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0)
                         goto fail;
 
-                if (!(prefix = unit_name_to_prefix(s->meta.id))) {
+                if (!(prefix = unit_name_to_prefix(UNIT(s)->id))) {
                         free(instance);
                         r = -ENOMEM;
                         goto fail;
@@ -1275,16 +1426,16 @@ static void socket_enter_running(Socket *s, int cfd) {
                         goto fail;
                 }
 
-                if ((r = unit_add_name(UNIT(s->service), name)) < 0) {
+                if ((r = unit_add_name(UNIT_DEREF(s->service), name)) < 0) {
                         free(name);
                         goto fail;
                 }
 
-                service = s->service;
-                s->service = NULL;
+                service = SERVICE(UNIT_DEREF(s->service));
+                unit_ref_unset(&s->service);
                 s->n_accepted ++;
 
-                service->meta.no_gc = false;
+                UNIT(service)->no_gc = false;
 
                 unit_choose_id(UNIT(service), name);
                 free(name);
@@ -1295,7 +1446,7 @@ static void socket_enter_running(Socket *s, int cfd) {
                 cfd = -1;
                 s->n_connections ++;
 
-                if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
+                if ((r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0)
                         goto fail;
 
                 /* Notify clients about changed counters */
@@ -1305,7 +1456,7 @@ static void socket_enter_running(Socket *s, int cfd) {
         return;
 
 fail:
-        log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r));
+        log_warning("%s failed to queue socket startup job: %s", UNIT(s)->id, bus_error(&error, r));
         socket_enter_stop_pre(s, false);
 
         if (cfd >= 0)
@@ -1334,7 +1485,7 @@ static void socket_run_next(Socket *s, bool success) {
         return;
 
 fail:
-        log_warning("%s failed to run next task: %s", s->meta.id, strerror(-r));
+        log_warning("%s failed to run next task: %s", UNIT(s)->id, strerror(-r));
 
         if (s->state == SOCKET_START_POST)
                 socket_enter_stop_pre(s, false);
@@ -1364,23 +1515,27 @@ static int socket_start(Unit *u) {
                 return 0;
 
         /* Cannot run this without the service being around */
-        if (s->service) {
-                if (s->service->meta.load_state != UNIT_LOADED) {
-                        log_error("Socket service %s not loaded, refusing.", s->service->meta.id);
+        if (UNIT_DEREF(s->service)) {
+                Service *service;
+
+                service = SERVICE(UNIT_DEREF(s->service));
+
+                if (UNIT(service)->load_state != UNIT_LOADED) {
+                        log_error("Socket service %s not loaded, refusing.", UNIT(service)->id);
                         return -ENOENT;
                 }
 
                 /* If the service is already active we cannot start the
                  * socket */
-                if (s->service->state != SERVICE_DEAD &&
-                    s->service->state != SERVICE_FAILED &&
-                    s->service->state != SERVICE_AUTO_RESTART) {
-                        log_error("Socket service %s already active, refusing.", s->service->meta.id);
+                if (service->state != SERVICE_DEAD &&
+                    service->state != SERVICE_FAILED &&
+                    service->state != SERVICE_AUTO_RESTART) {
+                        log_error("Socket service %s already active, refusing.", UNIT(service)->id);
                         return -EBUSY;
                 }
 
 #ifdef HAVE_SYSV_COMPAT
-                if (s->service->sysv_path) {
+                if (service->sysv_path) {
                         log_error("Using SysV services for socket activation is not supported. Refusing.");
                         return -ENOENT;
                 }
@@ -1461,7 +1616,9 @@ static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
                         else
                                 unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
                         free(t);
-                } else {
+                } else if (p->type == SOCKET_SPECIAL)
+                        unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
+                else {
                         assert(p->type == SOCKET_FIFO);
                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
                 }
@@ -1525,7 +1682,28 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                 else {
 
                         LIST_FOREACH(port, p, s->ports)
-                                if (streq(p->path, value+skip))
+                                if (p->type == SOCKET_FIFO &&
+                                    streq_ptr(p->path, value+skip))
+                                        break;
+
+                        if (p) {
+                                if (p->fd >= 0)
+                                        close_nointr_nofail(p->fd);
+                                p->fd = fdset_remove(fds, fd);
+                        }
+                }
+
+        } else if (streq(key, "special")) {
+                int fd, skip = 0;
+                SocketPort *p;
+
+                if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
+                        log_debug("Failed to parse special value %s", value);
+                else {
+
+                        LIST_FOREACH(port, p, s->ports)
+                                if (p->type == SOCKET_SPECIAL &&
+                                    streq_ptr(p->path, value+skip))
                                         break;
 
                         if (p) {
@@ -1609,10 +1787,15 @@ static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
         if (s->state != SOCKET_LISTENING)
                 return;
 
-        log_debug("Incoming traffic on %s", u->meta.id);
+        log_debug("Incoming traffic on %s", u->id);
 
         if (events != EPOLLIN) {
-                log_error("Got invalid poll event on socket.");
+
+                if (events & EPOLLHUP)
+                        log_error("%s: Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that.", u->id);
+                else
+                        log_error("%s: Got unexpected poll event (0x%x) on socket.", u->id, events);
+
                 goto fail;
         }
 
@@ -1656,18 +1839,18 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
         success = is_clean_exit(code, status);
 
         if (s->control_command) {
-                exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id);
+                exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
 
                 if (s->control_command->ignore)
                         success = true;
         }
 
         log_full(success ? LOG_DEBUG : LOG_NOTICE,
-                 "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
+                 "%s control process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
         s->failure = s->failure || !success;
 
         if (s->control_command && s->control_command->command_next && success) {
-                log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state));
+                log_debug("%s running next command for state %s", u->id, socket_state_to_string(s->state));
                 socket_run_next(s, success);
         } else {
                 s->control_command = NULL;
@@ -1676,7 +1859,7 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
                 /* No further commands for this step, so let's figure
                  * out what to do next */
 
-                log_debug("%s got final SIGCHLD for state %s", u->meta.id, socket_state_to_string(s->state));
+                log_debug("%s got final SIGCHLD for state %s", u->id, socket_state_to_string(s->state));
 
                 switch (s->state) {
 
@@ -1725,52 +1908,52 @@ static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
         switch (s->state) {
 
         case SOCKET_START_PRE:
-                log_warning("%s starting timed out. Terminating.", u->meta.id);
+                log_warning("%s starting timed out. Terminating.", u->id);
                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
                 break;
 
         case SOCKET_START_POST:
-                log_warning("%s starting timed out. Stopping.", u->meta.id);
+                log_warning("%s starting timed out. Stopping.", u->id);
                 socket_enter_stop_pre(s, false);
                 break;
 
         case SOCKET_STOP_PRE:
-                log_warning("%s stopping timed out. Terminating.", u->meta.id);
+                log_warning("%s stopping timed out. Terminating.", u->id);
                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
                 break;
 
         case SOCKET_STOP_PRE_SIGTERM:
                 if (s->exec_context.send_sigkill) {
-                        log_warning("%s stopping timed out. Killing.", u->meta.id);
+                        log_warning("%s stopping timed out. Killing.", u->id);
                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
                 } else {
-                        log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
+                        log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->id);
                         socket_enter_stop_post(s, false);
                 }
                 break;
 
         case SOCKET_STOP_PRE_SIGKILL:
-                log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
+                log_warning("%s still around after SIGKILL. Ignoring.", u->id);
                 socket_enter_stop_post(s, false);
                 break;
 
         case SOCKET_STOP_POST:
-                log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
+                log_warning("%s stopping timed out (2). Terminating.", u->id);
                 socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
                 break;
 
         case SOCKET_FINAL_SIGTERM:
                 if (s->exec_context.send_sigkill) {
-                        log_warning("%s stopping timed out (2). Killing.", u->meta.id);
+                        log_warning("%s stopping timed out (2). Killing.", u->id);
                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
                 } else {
-                        log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->meta.id);
+                        log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->id);
                         socket_enter_dead(s, false);
                 }
                 break;
 
         case SOCKET_FINAL_SIGKILL:
-                log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
+                log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->id);
                 socket_enter_dead(s, false);
                 break;
 
@@ -1795,6 +1978,12 @@ int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
                 if (p->fd >= 0)
                         rn_fds++;
 
+        if (rn_fds <= 0) {
+                *fds = NULL;
+                *n_fds = 0;
+                return 0;
+        }
+
         if (!(rfds = new(int, rn_fds)))
                 return -ENOMEM;
 
@@ -1820,7 +2009,7 @@ void socket_notify_service_dead(Socket *s) {
          * services. */
 
         if (s->state == SOCKET_RUNNING) {
-                log_debug("%s got notified about service death.", s->meta.id);
+                log_debug("%s got notified about service death.", UNIT(s)->id);
                 socket_enter_listening(s);
         }
 }
@@ -1836,7 +2025,7 @@ void socket_connection_unref(Socket *s) {
         assert(s->n_connections > 0);
         s->n_connections--;
 
-        log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections);
+        log_debug("%s: One connection closed, %u left.", UNIT(s)->id, s->n_connections);
 }
 
 static void socket_reset_failed(Unit *u) {
@@ -1859,19 +2048,20 @@ static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError
 
         if (who == KILL_MAIN) {
                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
-                return -EINVAL;
+                return -ESRCH;
         }
 
         if (s->control_pid <= 0 && who == KILL_CONTROL) {
                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
-                return -ENOENT;
+                return -ESRCH;
         }
 
-        if (s->control_pid > 0)
-                if (kill(s->control_pid, signo) < 0)
-                        r = -errno;
+        if (who == KILL_CONTROL || who == KILL_ALL)
+                if (s->control_pid > 0)
+                        if (kill(s->control_pid, signo) < 0)
+                                r = -errno;
 
-        if (mode == KILL_CONTROL_GROUP) {
+        if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
                 int q;
 
                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
@@ -1884,8 +2074,8 @@ static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError
                                 goto finish;
                         }
 
-                if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0)
-                        if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
+                if ((q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set)) < 0)
+                        if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
                                 r = q;
         }
 
@@ -1924,6 +2114,11 @@ DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
 
 const UnitVTable socket_vtable = {
         .suffix = ".socket",
+        .object_size = sizeof(Socket),
+        .sections =
+                "Unit\0"
+                "Socket\0"
+                "Install\0",
 
         .init = socket_init,
         .done = socket_done,