move libsystemd_core.la sources into core/

1 files changed, 2218 insertions, 0 deletions

diff --git a/src/core/socket.c b/src/core/socket.c
new file mode 100644
index 0000000000..5b24b3422b
--- /dev/null
+++ b/src/core/socket.c
@@ -0,0 +1,2218 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+#include <signal.h>
+#include <arpa/inet.h>
+#include <mqueue.h>
+
+#include "unit.h"
+#include "socket.h"
+#include "netinet/tcp.h"
+#include "log.h"
+#include "load-dropin.h"
+#include "load-fragment.h"
+#include "strv.h"
+#include "mkdir.h"
+#include "unit-name.h"
+#include "dbus-socket.h"
+#include "missing.h"
+#include "special.h"
+#include "bus-errors.h"
+#include "label.h"
+#include "exit-status.h"
+#include "def.h"
+
+static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
+        [SOCKET_DEAD] = UNIT_INACTIVE,
+        [SOCKET_START_PRE] = UNIT_ACTIVATING,
+        [SOCKET_START_POST] = UNIT_ACTIVATING,
+        [SOCKET_LISTENING] = UNIT_ACTIVE,
+        [SOCKET_RUNNING] = UNIT_ACTIVE,
+        [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
+        [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
+        [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
+        [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
+        [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
+        [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
+        [SOCKET_FAILED] = UNIT_FAILED
+};
+
+static void socket_init(Unit *u) {
+        Socket *s = SOCKET(u);
+
+        assert(u);
+        assert(u->load_state == UNIT_STUB);
+
+        s->backlog = SOMAXCONN;
+        s->timeout_usec = DEFAULT_TIMEOUT_USEC;
+        s->directory_mode = 0755;
+        s->socket_mode = 0666;
+
+        s->max_connections = 64;
+
+        s->priority = -1;
+        s->ip_tos = -1;
+        s->ip_ttl = -1;
+        s->mark = -1;
+
+        exec_context_init(&s->exec_context);
+        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;
+}
+
+static void socket_unwatch_control_pid(Socket *s) {
+        assert(s);
+
+        if (s->control_pid <= 0)
+                return;
+
+        unit_unwatch_pid(UNIT(s), s->control_pid);
+        s->control_pid = 0;
+}
+
+static void socket_done(Unit *u) {
+        Socket *s = SOCKET(u);
+        SocketPort *p;
+
+        assert(s);
+
+        while ((p = s->ports)) {
+                LIST_REMOVE(SocketPort, port, s->ports, p);
+
+                if (p->fd >= 0) {
+                        unit_unwatch_fd(UNIT(s), &p->fd_watch);
+                        close_nointr_nofail(p->fd);
+                }
+
+                free(p->path);
+                free(p);
+        }
+
+        exec_context_done(&s->exec_context);
+        exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
+        s->control_command = NULL;
+
+        socket_unwatch_control_pid(s);
+
+        unit_ref_unset(&s->service);
+
+        free(s->tcp_congestion);
+        s->tcp_congestion = NULL;
+
+        free(s->bind_to_device);
+        s->bind_to_device = NULL;
+
+        unit_unwatch_timer(u, &s->timer_watch);
+}
+
+static int socket_instantiate_service(Socket *s) {
+        char *prefix, *name;
+        int r;
+        Unit *u;
+
+        assert(s);
+
+        /* This fills in s->service if it isn't filled in yet. For
+         * Accept=yes sockets we create the next connection service
+         * here. For Accept=no this is mostly a NOP since the service
+         * is figured out at load time anyway. */
+
+        if (UNIT_DEREF(s->service))
+                return 0;
+
+        assert(s->accept);
+
+        if (!(prefix = unit_name_to_prefix(UNIT(s)->id)))
+                return -ENOMEM;
+
+        r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
+        free(prefix);
+
+        if (r < 0)
+                return -ENOMEM;
+
+        r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
+        free(name);
+
+        if (r < 0)
+                return r;
+
+#ifdef HAVE_SYSV_COMPAT
+        if (SERVICE(u)->sysv_path) {
+                log_error("Using SysV services for socket activation is not supported. Refusing.");
+                return -ENOENT;
+        }
+#endif
+
+        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) {
+        SocketPort *p;
+
+        assert(s);
+
+        if (!s->accept)
+                return true;
+
+        LIST_FOREACH(port, p, s->ports) {
+
+                if (p->type != SOCKET_SOCKET)
+                        return true;
+
+                if (!socket_address_can_accept(&p->address))
+                        return true;
+        }
+
+        return false;
+}
+
+static int socket_verify(Socket *s) {
+        assert(s);
+
+        if (UNIT(s)->load_state != UNIT_LOADED)
+                return 0;
+
+        if (!s->ports) {
+                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.", UNIT(s)->id);
+                return -EINVAL;
+        }
+
+        if (s->accept && s->max_connections <= 0) {
+                log_error("%s's MaxConnection setting too small. Refusing.", UNIT(s)->id);
+                return -EINVAL;
+        }
+
+        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.", UNIT(s)->id);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static bool socket_needs_mount(Socket *s, const char *prefix) {
+        SocketPort *p;
+
+        assert(s);
+
+        LIST_FOREACH(port, p, s->ports) {
+
+                if (p->type == SOCKET_SOCKET) {
+                        if (socket_address_needs_mount(&p->address, prefix))
+                                return true;
+                } else if (p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL) {
+                        if (path_startswith(p->path, prefix))
+                                return true;
+                }
+        }
+
+        return false;
+}
+
+int socket_add_one_mount_link(Socket *s, Mount *m) {
+        int r;
+
+        assert(s);
+        assert(m);
+
+        if (UNIT(s)->load_state != UNIT_LOADED ||
+            UNIT(m)->load_state != UNIT_LOADED)
+                return 0;
+
+        if (!socket_needs_mount(s, m->where))
+                return 0;
+
+        if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
+                return r;
+
+        return 0;
+}
+
+static int socket_add_mount_links(Socket *s) {
+        Unit *other;
+        int r;
+
+        assert(s);
+
+        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;
+
+        return 0;
+}
+
+static int socket_add_device_link(Socket *s) {
+        char *t;
+        int r;
+
+        assert(s);
+
+        if (!s->bind_to_device)
+                return 0;
+
+        if (asprintf(&t, "/sys/subsystem/net/devices/%s", s->bind_to_device) < 0)
+                return -ENOMEM;
+
+        r = unit_add_node_link(UNIT(s), t, false);
+        free(t);
+
+        return r;
+}
+
+static int socket_add_default_dependencies(Socket *s) {
+        int r;
+        assert(s);
+
+        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;
+
+                if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
+                        return r;
+        }
+
+        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->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->load_state == UNIT_LOADED) {
+
+                if (have_non_accept_socket(s)) {
+
+                        if (!UNIT_DEREF(s->service)) {
+                                Unit *x;
+
+                                r = unit_load_related_unit(u, ".service", &x);
+                                if (r < 0)
+                                        return r;
+
+                                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;
+                }
+
+                if ((r = socket_add_mount_links(s)) < 0)
+                        return r;
+
+                if ((r = socket_add_device_link(s)) < 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 (UNIT(s)->default_dependencies)
+                        if ((r = socket_add_default_dependencies(s)) < 0)
+                                return r;
+        }
+
+        return socket_verify(s);
+}
+
+static const char* listen_lookup(int family, int type) {
+
+        if (family == AF_NETLINK)
+                return "ListenNetlink";
+
+        if (type == SOCK_STREAM)
+                return "ListenStream";
+        else if (type == SOCK_DGRAM)
+                return "ListenDatagram";
+        else if (type == SOCK_SEQPACKET)
+                return "ListenSequentialPacket";
+
+        assert_not_reached("Unknown socket type");
+        return NULL;
+}
+
+static void socket_dump(Unit *u, FILE *f, const char *prefix) {
+
+        SocketExecCommand c;
+        Socket *s = SOCKET(u);
+        SocketPort *p;
+        const char *prefix2;
+        char *p2;
+
+        assert(s);
+        assert(f);
+
+        p2 = strappend(prefix, "\t");
+        prefix2 = p2 ? p2 : prefix;
+
+        fprintf(f,
+                "%sSocket State: %s\n"
+                "%sResult: %s\n"
+                "%sBindIPv6Only: %s\n"
+                "%sBacklog: %u\n"
+                "%sSocketMode: %04o\n"
+                "%sDirectoryMode: %04o\n"
+                "%sKeepAlive: %s\n"
+                "%sFreeBind: %s\n"
+                "%sTransparent: %s\n"
+                "%sBroadcast: %s\n"
+                "%sPassCredentials: %s\n"
+                "%sPassSecurity: %s\n"
+                "%sTCPCongestion: %s\n",
+                prefix, socket_state_to_string(s->state),
+                prefix, socket_result_to_string(s->result),
+                prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only),
+                prefix, s->backlog,
+                prefix, s->socket_mode,
+                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, yes_no(s->pass_sec),
+                prefix, strna(s->tcp_congestion));
+
+        if (s->control_pid > 0)
+                fprintf(f,
+                        "%sControl PID: %lu\n",
+                        prefix, (unsigned long) s->control_pid);
+
+        if (s->bind_to_device)
+                fprintf(f,
+                        "%sBindToDevice: %s\n",
+                        prefix, s->bind_to_device);
+
+        if (s->accept)
+                fprintf(f,
+                        "%sAccepted: %u\n"
+                        "%sNConnections: %u\n"
+                        "%sMaxConnections: %u\n",
+                        prefix, s->n_accepted,
+                        prefix, s->n_connections,
+                        prefix, s->max_connections);
+
+        if (s->priority >= 0)
+                fprintf(f,
+                        "%sPriority: %i\n",
+                        prefix, s->priority);
+
+        if (s->receive_buffer > 0)
+                fprintf(f,
+                        "%sReceiveBuffer: %zu\n",
+                        prefix, s->receive_buffer);
+
+        if (s->send_buffer > 0)
+                fprintf(f,
+                        "%sSendBuffer: %zu\n",
+                        prefix, s->send_buffer);
+
+        if (s->ip_tos >= 0)
+                fprintf(f,
+                        "%sIPTOS: %i\n",
+                        prefix, s->ip_tos);
+
+        if (s->ip_ttl >= 0)
+                fprintf(f,
+                        "%sIPTTL: %i\n",
+                        prefix, s->ip_ttl);
+
+        if (s->pipe_size > 0)
+                fprintf(f,
+                        "%sPipeSize: %zu\n",
+                        prefix, s->pipe_size);
+
+        if (s->mark >= 0)
+                fprintf(f,
+                        "%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) {
+                        const char *t;
+                        int r;
+                        char *k = NULL;
+
+                        if ((r = socket_address_print(&p->address, &k)) < 0)
+                                t = strerror(-r);
+                        else
+                                t = k;
+
+                        fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
+                        free(k);
+                } 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);
+        }
+
+        exec_context_dump(&s->exec_context, f, prefix);
+
+        for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
+                if (!s->exec_command[c])
+                        continue;
+
+                fprintf(f, "%s-> %s:\n",
+                        prefix, socket_exec_command_to_string(c));
+
+                exec_command_dump_list(s->exec_command[c], f, prefix2);
+        }
+
+        free(p2);
+}
+
+static int instance_from_socket(int fd, unsigned nr, char **instance) {
+        socklen_t l;
+        char *r;
+        union {
+                struct sockaddr sa;
+                struct sockaddr_un un;
+                struct sockaddr_in in;
+                struct sockaddr_in6 in6;
+                struct sockaddr_storage storage;
+        } local, remote;
+
+        assert(fd >= 0);
+        assert(instance);
+
+        l = sizeof(local);
+        if (getsockname(fd, &local.sa, &l) < 0)
+                return -errno;
+
+        l = sizeof(remote);
+        if (getpeername(fd, &remote.sa, &l) < 0)
+                return -errno;
+
+        switch (local.sa.sa_family) {
+
+        case AF_INET: {
+                uint32_t
+                        a = ntohl(local.in.sin_addr.s_addr),
+                        b = ntohl(remote.in.sin_addr.s_addr);
+
+                if (asprintf(&r,
+                             "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
+                             nr,
+                             a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
+                             ntohs(local.in.sin_port),
+                             b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
+                             ntohs(remote.in.sin_port)) < 0)
+                        return -ENOMEM;
+
+                break;
+        }
+
+        case AF_INET6: {
+                static const char ipv4_prefix[] = {
+                        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
+                };
+
+                if (memcmp(&local.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0 &&
+                    memcmp(&remote.in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
+                        const uint8_t
+                                *a = local.in6.sin6_addr.s6_addr+12,
+                                *b = remote.in6.sin6_addr.s6_addr+12;
+
+                        if (asprintf(&r,
+                                     "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u",
+                                     nr,
+                                     a[0], a[1], a[2], a[3],
+                                     ntohs(local.in6.sin6_port),
+                                     b[0], b[1], b[2], b[3],
+                                     ntohs(remote.in6.sin6_port)) < 0)
+                                return -ENOMEM;
+                } else {
+                        char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN];
+
+                        if (asprintf(&r,
+                                     "%u-%s:%u-%s:%u",
+                                     nr,
+                                     inet_ntop(AF_INET6, &local.in6.sin6_addr, a, sizeof(a)),
+                                     ntohs(local.in6.sin6_port),
+                                     inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
+                                     ntohs(remote.in6.sin6_port)) < 0)
+                                return -ENOMEM;
+                }
+
+                break;
+        }
+
+        case AF_UNIX: {
+                struct ucred ucred;
+
+                l = sizeof(ucred);
+                if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
+                        return -errno;
+
+                if (asprintf(&r,
+                             "%u-%lu-%lu",
+                             nr,
+                             (unsigned long) ucred.pid,
+                             (unsigned long) ucred.uid) < 0)
+                        return -ENOMEM;
+
+                break;
+        }
+
+        default:
+                assert_not_reached("Unhandled socket type.");
+        }
+
+        *instance = r;
+        return 0;
+}
+
+static void socket_close_fds(Socket *s) {
+        SocketPort *p;
+
+        assert(s);
+
+        LIST_FOREACH(port, p, s->ports) {
+                if (p->fd < 0)
+                        continue;
+
+                unit_unwatch_fd(UNIT(s), &p->fd_watch);
+                close_nointr_nofail(p->fd);
+
+                /* One little note: we should never delete any sockets
+                 * in the file system here! After all some other
+                 * process we spawned might still have a reference of
+                 * this fd and wants to continue to use it. Therefore
+                 * we delete sockets in the file system before we
+                 * create a new one, not after we stopped using
+                 * one! */
+
+                p->fd = -1;
+        }
+}
+
+static void socket_apply_socket_options(Socket *s, int fd) {
+        assert(s);
+        assert(fd >= 0);
+
+        if (s->keep_alive) {
+                int b = s->keep_alive;
+                if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &b, sizeof(b)) < 0)
+                        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->pass_sec) {
+                int one = 1;
+                if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
+                        log_warning("SO_PASSSEC 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;
+
+                /* We first try with SO_RCVBUFFORCE, in case we have the perms for that */
+
+                if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
+                        if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
+                                log_warning("SO_RCVBUF failed: %m");
+        }
+
+        if (s->send_buffer > 0) {
+                int value = (int) s->send_buffer;
+                if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
+                        if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
+                                log_warning("SO_SNDBUF failed: %m");
+        }
+
+        if (s->mark >= 0)
+                if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0)
+                        log_warning("SO_MARK failed: %m");
+
+        if (s->ip_tos >= 0)
+                if (setsockopt(fd, IPPROTO_IP, IP_TOS, &s->ip_tos, sizeof(s->ip_tos)) < 0)
+                        log_warning("IP_TOS failed: %m");
+
+        if (s->ip_ttl >= 0) {
+                int r, x;
+
+                r = setsockopt(fd, IPPROTO_IP, IP_TTL, &s->ip_ttl, sizeof(s->ip_ttl));
+
+                if (socket_ipv6_is_supported())
+                        x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl));
+                else {
+                        x = -1;
+                        errno = EAFNOSUPPORT;
+                }
+
+                if (r < 0 && x < 0)
+                        log_warning("IP_TTL/IPV6_UNICAST_HOPS failed: %m");
+        }
+
+        if (s->tcp_congestion)
+                if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
+                        log_warning("TCP_CONGESTION failed: %m");
+}
+
+static void socket_apply_fifo_options(Socket *s, int fd) {
+        assert(s);
+        assert(fd >= 0);
+
+        if (s->pipe_size > 0)
+                if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
+                        log_warning("F_SETPIPE_SZ: %m");
+}
+
+static int fifo_address_create(
+                const char *path,
+                mode_t directory_mode,
+                mode_t socket_mode,
+                int *_fd) {
+
+        int fd = -1, r = 0;
+        struct stat st;
+        mode_t old_mask;
+
+        assert(path);
+        assert(_fd);
+
+        mkdir_parents(path, directory_mode);
+
+        if ((r = label_fifofile_set(path)) < 0)
+                goto fail;
+
+        /* Enforce the right access mode for the fifo */
+        old_mask = umask(~ socket_mode);
+
+        /* Include the original umask in our mask */
+        umask(~socket_mode | old_mask);
+
+        r = mkfifo(path, socket_mode);
+        umask(old_mask);
+
+        if (r < 0 && errno != EEXIST) {
+                r = -errno;
+                goto fail;
+        }
+
+        if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        label_file_clear();
+
+        if (fstat(fd, &st) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        if (!S_ISFIFO(st.st_mode) ||
+            (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
+            st.st_uid != getuid() ||
+            st.st_gid != getgid()) {
+
+                r = -EEXIST;
+                goto fail;
+        }
+
+        *_fd = fd;
+        return 0;
+
+fail:
+        label_file_clear();
+
+        if (fd >= 0)
+                close_nointr_nofail(fd);
+
+        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;
+        char *label = NULL;
+        bool know_label = false;
+
+        assert(s);
+
+        LIST_FOREACH(port, p, s->ports) {
+
+                if (p->fd >= 0)
+                        continue;
+
+                if (p->type == SOCKET_SOCKET) {
+
+                        if (!know_label) {
+
+                                if ((r = socket_instantiate_service(s)) < 0)
+                                        return r;
+
+                                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;
+                        }
+
+                        if ((r = socket_address_listen(
+                                             &p->address,
+                                             s->backlog,
+                                             s->bind_ipv6_only,
+                                             s->bind_to_device,
+                                             s->free_bind,
+                                             s->transparent,
+                                             s->directory_mode,
+                                             s->socket_mode,
+                                             label,
+                                             &p->fd)) < 0)
+                                goto rollback;
+
+                        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(
+                                             p->path,
+                                             s->directory_mode,
+                                             s->socket_mode,
+                                             &p->fd)) < 0)
+                                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");
+        }
+
+        label_free(label);
+        return 0;
+
+rollback:
+        socket_close_fds(s);
+        label_free(label);
+        return r;
+}
+
+static void socket_unwatch_fds(Socket *s) {
+        SocketPort *p;
+
+        assert(s);
+
+        LIST_FOREACH(port, p, s->ports) {
+                if (p->fd < 0)
+                        continue;
+
+                unit_unwatch_fd(UNIT(s), &p->fd_watch);
+        }
+}
+
+static int socket_watch_fds(Socket *s) {
+        SocketPort *p;
+        int r;
+
+        assert(s);
+
+        LIST_FOREACH(port, p, s->ports) {
+                if (p->fd < 0)
+                        continue;
+
+                p->fd_watch.socket_accept =
+                        s->accept &&
+                        p->type == SOCKET_SOCKET &&
+                        socket_address_can_accept(&p->address);
+
+                if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
+                        goto fail;
+        }
+
+        return 0;
+
+fail:
+        socket_unwatch_fds(s);
+        return r;
+}
+
+static void socket_set_state(Socket *s, SocketState state) {
+        SocketState old_state;
+        assert(s);
+
+        old_state = s->state;
+        s->state = state;
+
+        if (state != SOCKET_START_PRE &&
+            state != SOCKET_START_POST &&
+            state != SOCKET_STOP_PRE &&
+            state != SOCKET_STOP_PRE_SIGTERM &&
+            state != SOCKET_STOP_PRE_SIGKILL &&
+            state != SOCKET_STOP_POST &&
+            state != SOCKET_FINAL_SIGTERM &&
+            state != SOCKET_FINAL_SIGKILL) {
+                unit_unwatch_timer(UNIT(s), &s->timer_watch);
+                socket_unwatch_control_pid(s);
+                s->control_command = NULL;
+                s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
+        }
+
+        if (state != SOCKET_LISTENING)
+                socket_unwatch_fds(s);
+
+        if (state != SOCKET_START_POST &&
+            state != SOCKET_LISTENING &&
+            state != SOCKET_RUNNING &&
+            state != SOCKET_STOP_PRE &&
+            state != SOCKET_STOP_PRE_SIGTERM &&
+            state != SOCKET_STOP_PRE_SIGKILL)
+                socket_close_fds(s);
+
+        if (state != old_state)
+                log_debug("%s changed %s -> %s",
+                          UNIT(s)->id,
+                          socket_state_to_string(old_state),
+                          socket_state_to_string(state));
+
+        unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
+}
+
+static int socket_coldplug(Unit *u) {
+        Socket *s = SOCKET(u);
+        int r;
+
+        assert(s);
+        assert(s->state == SOCKET_DEAD);
+
+        if (s->deserialized_state != s->state) {
+
+                if (s->deserialized_state == SOCKET_START_PRE ||
+                    s->deserialized_state == SOCKET_START_POST ||
+                    s->deserialized_state == SOCKET_STOP_PRE ||
+                    s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
+                    s->deserialized_state == SOCKET_STOP_PRE_SIGKILL ||
+                    s->deserialized_state == SOCKET_STOP_POST ||
+                    s->deserialized_state == SOCKET_FINAL_SIGTERM ||
+                    s->deserialized_state == SOCKET_FINAL_SIGKILL) {
+
+                        if (s->control_pid <= 0)
+                                return -EBADMSG;
+
+                        if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
+                                return r;
+
+                        if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+                                return r;
+                }
+
+                if (s->deserialized_state == SOCKET_START_POST ||
+                    s->deserialized_state == SOCKET_LISTENING ||
+                    s->deserialized_state == SOCKET_RUNNING ||
+                    s->deserialized_state == SOCKET_STOP_PRE ||
+                    s->deserialized_state == SOCKET_STOP_PRE_SIGTERM ||
+                    s->deserialized_state == SOCKET_STOP_PRE_SIGKILL)
+                        if ((r = socket_open_fds(s)) < 0)
+                                return r;
+
+                if (s->deserialized_state == SOCKET_LISTENING)
+                        if ((r = socket_watch_fds(s)) < 0)
+                                return r;
+
+                socket_set_state(s, s->deserialized_state);
+        }
+
+        return 0;
+}
+
+static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
+        pid_t pid;
+        int r;
+        char **argv;
+
+        assert(s);
+        assert(c);
+        assert(_pid);
+
+        if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+                goto fail;
+
+        if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        r = exec_spawn(c,
+                       argv,
+                       &s->exec_context,
+                       NULL, 0,
+                       UNIT(s)->manager->environment,
+                       true,
+                       true,
+                       true,
+                       UNIT(s)->manager->confirm_spawn,
+                       UNIT(s)->cgroup_bondings,
+                       UNIT(s)->cgroup_attributes,
+                       &pid);
+
+        strv_free(argv);
+        if (r < 0)
+                goto fail;
+
+        if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
+                /* FIXME: we need to do something here */
+                goto fail;
+
+        *_pid = pid;
+
+        return 0;
+
+fail:
+        unit_unwatch_timer(UNIT(s), &s->timer_watch);
+
+        return r;
+}
+
+static void socket_enter_dead(Socket *s, SocketResult f) {
+        assert(s);
+
+        if (f != SOCKET_SUCCESS)
+                s->result = f;
+
+        socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
+}
+
+static void socket_enter_signal(Socket *s, SocketState state, SocketResult f);
+
+static void socket_enter_stop_post(Socket *s, SocketResult f) {
+        int r;
+        assert(s);
+
+        if (f != SOCKET_SUCCESS)
+                s->result = f;
+
+        socket_unwatch_control_pid(s);
+
+        s->control_command_id = SOCKET_EXEC_STOP_POST;
+
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
+                if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
+                        goto fail;
+
+                socket_set_state(s, SOCKET_STOP_POST);
+        } else
+                socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS);
+
+        return;
+
+fail:
+        log_warning("%s failed to run 'stop-post' task: %s", UNIT(s)->id, strerror(-r));
+        socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
+}
+
+static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
+        int r;
+        Set *pid_set = NULL;
+        bool wait_for_exit = false;
+
+        assert(s);
+
+        if (f != SOCKET_SUCCESS)
+                s->result = f;
+
+        if (s->exec_context.kill_mode != KILL_NONE) {
+                int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
+
+                if (s->control_pid > 0) {
+                        if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
+
+                                log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
+                        else
+                                wait_for_exit = true;
+                }
+
+                if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
+
+                        if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+
+                        /* Exclude the control pid from being killed via the cgroup */
+                        if (s->control_pid > 0)
+                                if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
+                                        goto fail;
+
+                        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)
+                                wait_for_exit = true;
+
+                        set_free(pid_set);
+                        pid_set = NULL;
+                }
+        }
+
+        if (wait_for_exit) {
+                if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+                        goto fail;
+
+                socket_set_state(s, state);
+        } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
+                socket_enter_stop_post(s, SOCKET_SUCCESS);
+        else
+                socket_enter_dead(s, SOCKET_SUCCESS);
+
+        return;
+
+fail:
+        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, SOCKET_FAILURE_RESOURCES);
+        else
+                socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
+
+        if (pid_set)
+                set_free(pid_set);
+}
+
+static void socket_enter_stop_pre(Socket *s, SocketResult f) {
+        int r;
+        assert(s);
+
+        if (f != SOCKET_SUCCESS)
+                s->result = f;
+
+        socket_unwatch_control_pid(s);
+
+        s->control_command_id = SOCKET_EXEC_STOP_PRE;
+
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
+                if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
+                        goto fail;
+
+                socket_set_state(s, SOCKET_STOP_PRE);
+        } else
+                socket_enter_stop_post(s, SOCKET_SUCCESS);
+
+        return;
+
+fail:
+        log_warning("%s failed to run 'stop-pre' task: %s", UNIT(s)->id, strerror(-r));
+        socket_enter_stop_post(s, SOCKET_FAILURE_RESOURCES);
+}
+
+static void socket_enter_listening(Socket *s) {
+        int r;
+        assert(s);
+
+        r = socket_watch_fds(s);
+        if (r < 0) {
+                log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
+                goto fail;
+        }
+
+        socket_set_state(s, SOCKET_LISTENING);
+        return;
+
+fail:
+        socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
+}
+
+static void socket_enter_start_post(Socket *s) {
+        int r;
+        assert(s);
+
+        r = socket_open_fds(s);
+        if (r < 0) {
+                log_warning("%s failed to listen on sockets: %s", UNIT(s)->id, strerror(-r));
+                goto fail;
+        }
+
+        socket_unwatch_control_pid(s);
+
+        s->control_command_id = SOCKET_EXEC_START_POST;
+
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
+                r = socket_spawn(s, s->control_command, &s->control_pid);
+                if (r < 0) {
+                        log_warning("%s failed to run 'start-post' task: %s", UNIT(s)->id, strerror(-r));
+                        goto fail;
+                }
+
+                socket_set_state(s, SOCKET_START_POST);
+        } else
+                socket_enter_listening(s);
+
+        return;
+
+fail:
+        socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
+}
+
+static void socket_enter_start_pre(Socket *s) {
+        int r;
+        assert(s);
+
+        socket_unwatch_control_pid(s);
+
+        s->control_command_id = SOCKET_EXEC_START_PRE;
+
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
+                if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
+                        goto fail;
+
+                socket_set_state(s, SOCKET_START_PRE);
+        } else
+                socket_enter_start_post(s);
+
+        return;
+
+fail:
+        log_warning("%s failed to run 'start-pre' task: %s", UNIT(s)->id, strerror(-r));
+        socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
+}
+
+static void socket_enter_running(Socket *s, int cfd) {
+        int r;
+        DBusError error;
+
+        assert(s);
+        dbus_error_init(&error);
+
+        /* 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.", UNIT(s)->id);
+
+                if (cfd >= 0)
+                        close_nointr_nofail(cfd);
+                else  {
+                        /* Flush all sockets by closing and reopening them */
+                        socket_close_fds(s);
+
+                        r = socket_watch_fds(s);
+                        if (r < 0) {
+                                log_warning("%s failed to watch sockets: %s", UNIT(s)->id, strerror(-r));
+                                socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
+                        }
+                }
+
+                return;
+        }
+
+        if (cfd < 0) {
+                Iterator i;
+                Unit *u;
+                bool pending = false;
+
+                /* If there's already a start pending don't bother to
+                 * do anything */
+                SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERS], i)
+                        if (unit_pending_active(u)) {
+                                pending = true;
+                                break;
+                        }
+
+                if (!pending) {
+                        r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, true, &error, NULL);
+                        if (r < 0)
+                                goto fail;
+                }
+
+                socket_set_state(s, SOCKET_RUNNING);
+        } else {
+                char *prefix, *instance = NULL, *name;
+                Service *service;
+
+                if (s->n_connections >= s->max_connections) {
+                        log_warning("Too many incoming connections (%u)", s->n_connections);
+                        close_nointr_nofail(cfd);
+                        return;
+                }
+
+                r = socket_instantiate_service(s);
+                if (r < 0)
+                        goto fail;
+
+                r = instance_from_socket(cfd, s->n_accepted, &instance);
+                if (r < 0) {
+                        if (r != -ENOTCONN)
+                                goto fail;
+
+                        /* ENOTCONN is legitimate if TCP RST was received.
+                         * This connection is over, but the socket unit lives on. */
+                        close_nointr_nofail(cfd);
+                        return;
+                }
+
+                prefix = unit_name_to_prefix(UNIT(s)->id);
+                if (!prefix) {
+                        free(instance);
+                        r = -ENOMEM;
+                        goto fail;
+                }
+
+                name = unit_name_build(prefix, instance, ".service");
+                free(prefix);
+                free(instance);
+
+                if (!name) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+
+                r = unit_add_name(UNIT_DEREF(s->service), name);
+                if (r < 0) {
+                        free(name);
+                        goto fail;
+                }
+
+                service = SERVICE(UNIT_DEREF(s->service));
+                unit_ref_unset(&s->service);
+                s->n_accepted ++;
+
+                UNIT(service)->no_gc = false;
+
+                unit_choose_id(UNIT(service), name);
+                free(name);
+
+                r = service_set_socket_fd(service, cfd, s);
+                if (r < 0)
+                        goto fail;
+
+                cfd = -1;
+                s->n_connections ++;
+
+                r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL);
+                if (r < 0)
+                        goto fail;
+
+                /* Notify clients about changed counters */
+                unit_add_to_dbus_queue(UNIT(s));
+        }
+
+        return;
+
+fail:
+        log_warning("%s failed to queue socket startup job: %s", UNIT(s)->id, bus_error(&error, r));
+        socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
+
+        if (cfd >= 0)
+                close_nointr_nofail(cfd);
+
+        dbus_error_free(&error);
+}
+
+static void socket_run_next(Socket *s) {
+        int r;
+
+        assert(s);
+        assert(s->control_command);
+        assert(s->control_command->command_next);
+
+        socket_unwatch_control_pid(s);
+
+        s->control_command = s->control_command->command_next;
+
+        if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
+                goto fail;
+
+        return;
+
+fail:
+        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, SOCKET_FAILURE_RESOURCES);
+        else if (s->state == SOCKET_STOP_POST)
+                socket_enter_dead(s, SOCKET_FAILURE_RESOURCES);
+        else
+                socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES);
+}
+
+static int socket_start(Unit *u) {
+        Socket *s = SOCKET(u);
+
+        assert(s);
+
+        /* We cannot fulfill this request right now, try again later
+         * please! */
+        if (s->state == SOCKET_STOP_PRE ||
+            s->state == SOCKET_STOP_PRE_SIGKILL ||
+            s->state == SOCKET_STOP_PRE_SIGTERM ||
+            s->state == SOCKET_STOP_POST ||
+            s->state == SOCKET_FINAL_SIGTERM ||
+            s->state == SOCKET_FINAL_SIGKILL)
+                return -EAGAIN;
+
+        if (s->state == SOCKET_START_PRE ||
+            s->state == SOCKET_START_POST)
+                return 0;
+
+        /* Cannot run this without the service being around */
+        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 (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 (service->sysv_path) {
+                        log_error("Using SysV services for socket activation is not supported. Refusing.");
+                        return -ENOENT;
+                }
+#endif
+        }
+
+        assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED);
+
+        s->result = SOCKET_SUCCESS;
+        socket_enter_start_pre(s);
+        return 0;
+}
+
+static int socket_stop(Unit *u) {
+        Socket *s = SOCKET(u);
+
+        assert(s);
+
+        /* Already on it */
+        if (s->state == SOCKET_STOP_PRE ||
+            s->state == SOCKET_STOP_PRE_SIGTERM ||
+            s->state == SOCKET_STOP_PRE_SIGKILL ||
+            s->state == SOCKET_STOP_POST ||
+            s->state == SOCKET_FINAL_SIGTERM ||
+            s->state == SOCKET_FINAL_SIGKILL)
+                return 0;
+
+        /* If there's already something running we go directly into
+         * kill mode. */
+        if (s->state == SOCKET_START_PRE ||
+            s->state == SOCKET_START_POST) {
+                socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_SUCCESS);
+                return -EAGAIN;
+        }
+
+        assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
+
+        socket_enter_stop_pre(s, SOCKET_SUCCESS);
+        return 0;
+}
+
+static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
+        Socket *s = SOCKET(u);
+        SocketPort *p;
+        int r;
+
+        assert(u);
+        assert(f);
+        assert(fds);
+
+        unit_serialize_item(u, f, "state", socket_state_to_string(s->state));
+        unit_serialize_item(u, f, "result", socket_result_to_string(s->result));
+        unit_serialize_item_format(u, f, "n-accepted", "%u", s->n_accepted);
+
+        if (s->control_pid > 0)
+                unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
+
+        if (s->control_command_id >= 0)
+                unit_serialize_item(u, f, "control-command", socket_exec_command_to_string(s->control_command_id));
+
+        LIST_FOREACH(port, p, s->ports) {
+                int copy;
+
+                if (p->fd < 0)
+                        continue;
+
+                if ((copy = fdset_put_dup(fds, p->fd)) < 0)
+                        return copy;
+
+                if (p->type == SOCKET_SOCKET) {
+                        char *t;
+
+                        if ((r = socket_address_print(&p->address, &t)) < 0)
+                                return r;
+
+                        if (socket_address_family(&p->address) == AF_NETLINK)
+                                unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t);
+                        else
+                                unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
+                        free(t);
+                } 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);
+                }
+        }
+
+        return 0;
+}
+
+static int socket_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
+        Socket *s = SOCKET(u);
+
+        assert(u);
+        assert(key);
+        assert(value);
+        assert(fds);
+
+        if (streq(key, "state")) {
+                SocketState state;
+
+                if ((state = socket_state_from_string(value)) < 0)
+                        log_debug("Failed to parse state value %s", value);
+                else
+                        s->deserialized_state = state;
+        } else if (streq(key, "result")) {
+                SocketResult f;
+
+                f = socket_result_from_string(value);
+                if (f < 0)
+                        log_debug("Failed to parse result value %s", value);
+                else if (f != SOCKET_SUCCESS)
+                        s->result = f;
+
+        } else if (streq(key, "n-accepted")) {
+                unsigned k;
+
+                if (safe_atou(value, &k) < 0)
+                        log_debug("Failed to parse n-accepted value %s", value);
+                else
+                        s->n_accepted += k;
+        } else if (streq(key, "control-pid")) {
+                pid_t pid;
+
+                if (parse_pid(value, &pid) < 0)
+                        log_debug("Failed to parse control-pid value %s", value);
+                else
+                        s->control_pid = pid;
+        } else if (streq(key, "control-command")) {
+                SocketExecCommand id;
+
+                if ((id = socket_exec_command_from_string(value)) < 0)
+                        log_debug("Failed to parse exec-command value %s", value);
+                else {
+                        s->control_command_id = id;
+                        s->control_command = s->exec_command[id];
+                }
+        } else if (streq(key, "fifo")) {
+                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 fifo value %s", value);
+                else {
+
+                        LIST_FOREACH(port, p, s->ports)
+                                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) {
+                                if (p->fd >= 0)
+                                        close_nointr_nofail(p->fd);
+                                p->fd = fdset_remove(fds, fd);
+                        }
+                }
+
+        } else if (streq(key, "socket")) {
+                int fd, type, skip = 0;
+                SocketPort *p;
+
+                if (sscanf(value, "%i %i %n", &fd, &type, &skip) < 2 || fd < 0 || type < 0 || !fdset_contains(fds, fd))
+                        log_debug("Failed to parse socket value %s", value);
+                else {
+
+                        LIST_FOREACH(port, p, s->ports)
+                                if (socket_address_is(&p->address, value+skip, type))
+                                        break;
+
+                        if (p) {
+                                if (p->fd >= 0)
+                                        close_nointr_nofail(p->fd);
+                                p->fd = fdset_remove(fds, fd);
+                        }
+                }
+
+        } else if (streq(key, "netlink")) {
+                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 socket value %s", value);
+                else {
+
+                        LIST_FOREACH(port, p, s->ports)
+                                if (socket_address_is_netlink(&p->address, value+skip))
+                                        break;
+
+                        if (p) {
+                                if (p->fd >= 0)
+                                        close_nointr_nofail(p->fd);
+                                p->fd = fdset_remove(fds, fd);
+                        }
+                }
+
+        } else
+                log_debug("Unknown serialization key '%s'", key);
+
+        return 0;
+}
+
+static UnitActiveState socket_active_state(Unit *u) {
+        assert(u);
+
+        return state_translation_table[SOCKET(u)->state];
+}
+
+static const char *socket_sub_state_to_string(Unit *u) {
+        assert(u);
+
+        return socket_state_to_string(SOCKET(u)->state);
+}
+
+static bool socket_check_gc(Unit *u) {
+        Socket *s = SOCKET(u);
+
+        assert(u);
+
+        return s->n_connections > 0;
+}
+
+static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
+        Socket *s = SOCKET(u);
+        int cfd = -1;
+
+        assert(s);
+        assert(fd >= 0);
+
+        if (s->state != SOCKET_LISTENING)
+                return;
+
+        log_debug("Incoming traffic on %s", u->id);
+
+        if (events != EPOLLIN) {
+
+                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;
+        }
+
+        if (w->socket_accept) {
+                for (;;) {
+
+                        if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
+
+                                if (errno == EINTR)
+                                        continue;
+
+                                log_error("Failed to accept socket: %m");
+                                goto fail;
+                        }
+
+                        break;
+                }
+
+                socket_apply_socket_options(s, cfd);
+        }
+
+        socket_enter_running(s, cfd);
+        return;
+
+fail:
+        socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
+}
+
+static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
+        Socket *s = SOCKET(u);
+        SocketResult f;
+
+        assert(s);
+        assert(pid >= 0);
+
+        if (pid != s->control_pid)
+                return;
+
+        s->control_pid = 0;
+
+        if (is_clean_exit(code, status))
+                f = SOCKET_SUCCESS;
+        else if (code == CLD_EXITED)
+                f = SOCKET_FAILURE_EXIT_CODE;
+        else if (code == CLD_KILLED)
+                f = SOCKET_FAILURE_SIGNAL;
+        else if (code == CLD_DUMPED)
+                f = SOCKET_FAILURE_CORE_DUMP;
+        else
+                assert_not_reached("Unknown code");
+
+        if (s->control_command) {
+                exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
+
+                if (s->control_command->ignore)
+                        f = SOCKET_SUCCESS;
+        }
+
+        log_full(f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
+                 "%s control process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
+
+        if (f != SOCKET_SUCCESS)
+                s->result = f;
+
+        if (s->control_command &&
+            s->control_command->command_next &&
+            f == SOCKET_SUCCESS) {
+
+                log_debug("%s running next command for state %s", u->id, socket_state_to_string(s->state));
+                socket_run_next(s);
+        } else {
+                s->control_command = NULL;
+                s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
+
+                /* 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->id, socket_state_to_string(s->state));
+
+                switch (s->state) {
+
+                case SOCKET_START_PRE:
+                        if (f == SOCKET_SUCCESS)
+                                socket_enter_start_post(s);
+                        else
+                                socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f);
+                        break;
+
+                case SOCKET_START_POST:
+                        if (f == SOCKET_SUCCESS)
+                                socket_enter_listening(s);
+                        else
+                                socket_enter_stop_pre(s, f);
+                        break;
+
+                case SOCKET_STOP_PRE:
+                case SOCKET_STOP_PRE_SIGTERM:
+                case SOCKET_STOP_PRE_SIGKILL:
+                        socket_enter_stop_post(s, f);
+                        break;
+
+                case SOCKET_STOP_POST:
+                case SOCKET_FINAL_SIGTERM:
+                case SOCKET_FINAL_SIGKILL:
+                        socket_enter_dead(s, f);
+                        break;
+
+                default:
+                        assert_not_reached("Uh, control process died at wrong time.");
+                }
+        }
+
+        /* Notify clients about changed exit status */
+        unit_add_to_dbus_queue(u);
+}
+
+static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
+        Socket *s = SOCKET(u);
+
+        assert(s);
+        assert(elapsed == 1);
+        assert(w == &s->timer_watch);
+
+        switch (s->state) {
+
+        case SOCKET_START_PRE:
+                log_warning("%s starting timed out. Terminating.", u->id);
+                socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
+                break;
+
+        case SOCKET_START_POST:
+                log_warning("%s starting timed out. Stopping.", u->id);
+                socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT);
+                break;
+
+        case SOCKET_STOP_PRE:
+                log_warning("%s stopping timed out. Terminating.", u->id);
+                socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT);
+                break;
+
+        case SOCKET_STOP_PRE_SIGTERM:
+                if (s->exec_context.send_sigkill) {
+                        log_warning("%s stopping timed out. Killing.", u->id);
+                        socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
+                } else {
+                        log_warning("%s stopping timed out. Skipping SIGKILL. Ignoring.", u->id);
+                        socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
+                }
+                break;
+
+        case SOCKET_STOP_PRE_SIGKILL:
+                log_warning("%s still around after SIGKILL. Ignoring.", u->id);
+                socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT);
+                break;
+
+        case SOCKET_STOP_POST:
+                log_warning("%s stopping timed out (2). Terminating.", u->id);
+                socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT);
+                break;
+
+        case SOCKET_FINAL_SIGTERM:
+                if (s->exec_context.send_sigkill) {
+                        log_warning("%s stopping timed out (2). Killing.", u->id);
+                        socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
+                } else {
+                        log_warning("%s stopping timed out (2). Skipping SIGKILL. Ignoring.", u->id);
+                        socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
+                }
+                break;
+
+        case SOCKET_FINAL_SIGKILL:
+                log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->id);
+                socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT);
+                break;
+
+        default:
+                assert_not_reached("Timeout at wrong time.");
+        }
+}
+
+int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
+        int *rfds;
+        unsigned rn_fds, k;
+        SocketPort *p;
+
+        assert(s);
+        assert(fds);
+        assert(n_fds);
+
+        /* Called from the service code for requesting our fds */
+
+        rn_fds = 0;
+        LIST_FOREACH(port, p, s->ports)
+                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;
+
+        k = 0;
+        LIST_FOREACH(port, p, s->ports)
+                if (p->fd >= 0)
+                        rfds[k++] = p->fd;
+
+        assert(k == rn_fds);
+
+        *fds = rfds;
+        *n_fds = rn_fds;
+
+        return 0;
+}
+
+void socket_notify_service_dead(Socket *s, bool failed_permanent) {
+        assert(s);
+
+        /* The service is dead. Dang!
+         *
+         * This is strictly for one-instance-for-all-connections
+         * services. */
+
+        if (s->state == SOCKET_RUNNING) {
+                log_debug("%s got notified about service death (failed permanently: %s)", UNIT(s)->id, yes_no(failed_permanent));
+                if (failed_permanent)
+                        socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_FAILED_PERMANENT);
+                else
+                        socket_enter_listening(s);
+        }
+}
+
+void socket_connection_unref(Socket *s) {
+        assert(s);
+
+        /* The service is dead. Yay!
+         *
+         * This is strictly for one-instance-per-connection
+         * services. */
+
+        assert(s->n_connections > 0);
+        s->n_connections--;
+
+        log_debug("%s: One connection closed, %u left.", UNIT(s)->id, s->n_connections);
+}
+
+static void socket_reset_failed(Unit *u) {
+        Socket *s = SOCKET(u);
+
+        assert(s);
+
+        if (s->state == SOCKET_FAILED)
+                socket_set_state(s, SOCKET_DEAD);
+
+        s->result = SOCKET_SUCCESS;
+}
+
+static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
+        Socket *s = SOCKET(u);
+        int r = 0;
+        Set *pid_set = NULL;
+
+        assert(s);
+
+        if (who == KILL_MAIN) {
+                dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Socket units have no main processes");
+                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 -ESRCH;
+        }
+
+        if (who == KILL_CONTROL || who == KILL_ALL)
+                if (s->control_pid > 0)
+                        if (kill(s->control_pid, signo) < 0)
+                                r = -errno;
+
+        if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
+                int q;
+
+                if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
+                        return -ENOMEM;
+
+                /* Exclude the control pid from being killed via the cgroup */
+                if (s->control_pid > 0)
+                        if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
+                                r = q;
+                                goto finish;
+                        }
+
+                if ((q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set)) < 0)
+                        if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
+                                r = q;
+        }
+
+finish:
+        if (pid_set)
+                set_free(pid_set);
+
+        return r;
+}
+
+static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
+        [SOCKET_DEAD] = "dead",
+        [SOCKET_START_PRE] = "start-pre",
+        [SOCKET_START_POST] = "start-post",
+        [SOCKET_LISTENING] = "listening",
+        [SOCKET_RUNNING] = "running",
+        [SOCKET_STOP_PRE] = "stop-pre",
+        [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
+        [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
+        [SOCKET_STOP_POST] = "stop-post",
+        [SOCKET_FINAL_SIGTERM] = "final-sigterm",
+        [SOCKET_FINAL_SIGKILL] = "final-sigkill",
+        [SOCKET_FAILED] = "failed"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(socket_state, SocketState);
+
+static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
+        [SOCKET_EXEC_START_PRE] = "StartPre",
+        [SOCKET_EXEC_START_POST] = "StartPost",
+        [SOCKET_EXEC_STOP_PRE] = "StopPre",
+        [SOCKET_EXEC_STOP_POST] = "StopPost"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
+
+static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
+        [SOCKET_SUCCESS] = "success",
+        [SOCKET_FAILURE_RESOURCES] = "resources",
+        [SOCKET_FAILURE_TIMEOUT] = "timeout",
+        [SOCKET_FAILURE_EXIT_CODE] = "exit-code",
+        [SOCKET_FAILURE_SIGNAL] = "signal",
+        [SOCKET_FAILURE_CORE_DUMP] = "core-dump",
+        [SOCKET_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
+
+const UnitVTable socket_vtable = {
+        .suffix = ".socket",
+        .object_size = sizeof(Socket),
+        .sections =
+                "Unit\0"
+                "Socket\0"
+                "Install\0",
+
+        .init = socket_init,
+        .done = socket_done,
+        .load = socket_load,
+
+        .kill = socket_kill,
+
+        .coldplug = socket_coldplug,
+
+        .dump = socket_dump,
+
+        .start = socket_start,
+        .stop = socket_stop,
+
+        .serialize = socket_serialize,
+        .deserialize_item = socket_deserialize_item,
+
+        .active_state = socket_active_state,
+        .sub_state_to_string = socket_sub_state_to_string,
+
+        .check_gc = socket_check_gc,
+
+        .fd_event = socket_fd_event,
+        .sigchld_event = socket_sigchld_event,
+        .timer_event = socket_timer_event,
+
+        .reset_failed = socket_reset_failed,
+
+        .bus_interface = "org.freedesktop.systemd1.Socket",
+        .bus_message_handler = bus_socket_message_handler,
+        .bus_invalidating_properties =  bus_socket_invalidating_properties
+};