chiark / gitweb /
socket: support socket activation of containers
[elogind.git] / src / core / socket.c
index 8153a8e76206b8093f2f28a66dde398ed780c597..324ec1e34bd03f0333f33f9aa7260e1fd09f54e8 100644 (file)
@@ -28,6 +28,9 @@
 #include <signal.h>
 #include <arpa/inet.h>
 #include <mqueue.h>
+#ifdef HAVE_ATTR_XATTR_H
+#include <attr/xattr.h>
+#endif
 
 #include "unit.h"
 #include "socket.h"
@@ -39,6 +42,7 @@
 #include "mkdir.h"
 #include "path-util.h"
 #include "unit-name.h"
+#include "unit-printf.h"
 #include "dbus-socket.h"
 #include "missing.h"
 #include "special.h"
@@ -83,6 +87,7 @@ static void socket_init(Unit *u) {
         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;
+        kill_context_init(&s->kill_context);
 
         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 }
@@ -129,6 +134,10 @@ static void socket_done(Unit *u) {
         free(s->bind_to_device);
         s->bind_to_device = NULL;
 
+        free(s->smack);
+        free(s->smack_ip_in);
+        free(s->smack_ip_out);
+
         unit_unwatch_timer(u, &s->timer_watch);
 }
 
@@ -223,7 +232,7 @@ static int socket_verify(Socket *s) {
                 return -EINVAL;
         }
 
-        if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
+        if (s->exec_context.pam_name && s->kill_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;
         }
@@ -263,7 +272,8 @@ int socket_add_one_mount_link(Socket *s, Mount *m) {
         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)
+        r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
+        if (r < 0)
                 return r;
 
         return 0;
@@ -275,9 +285,11 @@ static int socket_add_mount_links(Socket *s) {
 
         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)
+        LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT]) {
+                r = socket_add_one_mount_link(s, MOUNT(other));
+                if (r < 0)
                         return r;
+        }
 
         return 0;
 }
@@ -304,7 +316,7 @@ static int socket_add_default_dependencies(Socket *s) {
         int r;
         assert(s);
 
-        if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) {
+        if (UNIT(s)->manager->running_as == SYSTEMD_SYSTEM) {
                 if ((r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true)) < 0)
                         return r;
 
@@ -373,7 +385,7 @@ static int socket_load(Unit *u) {
                         if ((r = socket_add_default_dependencies(s)) < 0)
                                 return r;
 
-                r = unit_patch_working_directory(UNIT(s), &s->exec_context);
+                r = unit_exec_context_defaults(u, &s->exec_context);
                 if (r < 0)
                         return r;
         }
@@ -503,6 +515,21 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                         "%sMessageQueueMessageSize: %li\n",
                         prefix, s->mq_msgsize);
 
+        if (s->smack)
+                fprintf(f,
+                        "%sSmackLabel: %s\n",
+                        prefix, s->smack);
+
+        if (s->smack_ip_in)
+                fprintf(f,
+                        "%sSmackLabelIPIn: %s\n",
+                        prefix, s->smack_ip_in);
+
+        if (s->smack_ip_out)
+                fprintf(f,
+                        "%sSmackLabelIPOut: %s\n",
+                        prefix, s->smack_ip_out);
+
         LIST_FOREACH(port, p, s->ports) {
 
                 if (p->type == SOCKET_SOCKET) {
@@ -526,6 +553,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
         }
 
         exec_context_dump(&s->exec_context, f, prefix);
+        kill_context_dump(&s->kill_context, f, prefix);
 
         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
                 if (!s->exec_command[c])
@@ -582,7 +610,7 @@ static int instance_from_socket(int fd, unsigned nr, char **instance) {
         }
 
         case AF_INET6: {
-                static const char ipv4_prefix[] = {
+                static const unsigned char ipv4_prefix[] = {
                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
                 };
 
@@ -741,6 +769,16 @@ static void socket_apply_socket_options(Socket *s, int fd) {
         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");
+
+#ifdef HAVE_ATTR_XATTR_H
+        if (s->smack_ip_in)
+                if (fsetxattr(fd, "security.SMACK64IPIN", s->smack_ip_in, strlen(s->smack_ip_in), 0) < 0)
+                        log_error("fsetxattr(\"security.SMACK64IPIN\"): %m");
+
+        if (s->smack_ip_out)
+                if (fsetxattr(fd, "security.SMACK64IPOUT", s->smack_ip_out, strlen(s->smack_ip_out), 0) < 0)
+                        log_error("fsetxattr(\"security.SMACK64IPOUT\"): %m");
+#endif
 }
 
 static void socket_apply_fifo_options(Socket *s, int fd) {
@@ -750,6 +788,12 @@ static void socket_apply_fifo_options(Socket *s, int fd) {
         if (s->pipe_size > 0)
                 if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0)
                         log_warning("F_SETPIPE_SZ: %m");
+
+#ifdef HAVE_ATTR_XATTR_H
+        if (s->smack)
+                if (fsetxattr(fd, "security.SMACK64", s->smack, strlen(s->smack), 0) < 0)
+                        log_error("fsetxattr(\"security.SMACK64\"): %m");
+#endif
 }
 
 static int fifo_address_create(
@@ -1102,10 +1146,12 @@ static int socket_coldplug(Unit *u) {
                         if (s->control_pid <= 0)
                                 return -EBADMSG;
 
-                        if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
+                        r = unit_watch_pid(UNIT(s), s->control_pid);
+                        if (r < 0)
                                 return r;
 
-                        if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+                        r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
+                        if (r < 0)
                                 return r;
                 }
 
@@ -1137,10 +1183,12 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
         assert(c);
         assert(_pid);
 
-        if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+        r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
+        if (r < 0)
                 goto fail;
 
-        if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
+        argv = unit_full_printf_strv(UNIT(s), c->argv);
+        if (!argv) {
                 r = -ENOMEM;
                 goto fail;
         }
@@ -1226,8 +1274,8 @@ static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
         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->kill_context.kill_mode != KILL_NONE) {
+                int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? s->kill_context.kill_signal : SIGKILL;
 
                 if (s->control_pid > 0) {
                         if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
@@ -1237,7 +1285,7 @@ static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
                                 wait_for_exit = true;
                 }
 
-                if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
+                if (s->kill_context.kill_mode == KILL_CONTROL_GROUP) {
 
                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
                                 r = -ENOMEM;
@@ -1262,7 +1310,8 @@ static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
         }
 
         if (wait_for_exit) {
-                if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+                r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch);
+                if (r < 0)
                         goto fail;
 
                 socket_set_state(s, state);
@@ -1435,7 +1484,7 @@ static void socket_enter_running(Socket *s, int cfd) {
                 Service *service;
 
                 if (s->n_connections >= s->max_connections) {
-                        log_warning("Too many incoming connections (%u)", s->n_connections);
+                        log_warning("%s: Too many incoming connections (%u)", UNIT(s)->id, s->n_connections);
                         close_nointr_nofail(cfd);
                         return;
                 }
@@ -1504,7 +1553,7 @@ static void socket_enter_running(Socket *s, int cfd) {
         return;
 
 fail:
-        log_warning("%s failed to queue socket startup job: %s", UNIT(s)->id, bus_error(&error, r));
+        log_warning("%s failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s", UNIT(s)->id, cfd >= 0 ? "template" : "non-template", bus_error(&error, r));
         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
 
         if (cfd >= 0)
@@ -1653,7 +1702,8 @@ static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
                 if (p->type == SOCKET_SOCKET) {
                         char *t;
 
-                        if ((r = socket_address_print(&p->address, &t)) < 0)
+                        r = socket_address_print(&p->address, &t);
+                        if (r < 0)
                                 return r;
 
                         if (socket_address_family(&p->address) == AF_NETLINK)
@@ -1663,6 +1713,8 @@ static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
                         free(t);
                 } else if (p->type == SOCKET_SPECIAL)
                         unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
+                else if (p->type == SOCKET_MQUEUE)
+                        unit_serialize_item_format(u, f, "mqueue", "%i %s", copy, p->path);
                 else {
                         assert(p->type == SOCKET_FIFO);
                         unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
@@ -1683,7 +1735,8 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
         if (streq(key, "state")) {
                 SocketState state;
 
-                if ((state = socket_state_from_string(value)) < 0)
+                state = socket_state_from_string(value);
+                if (state < 0)
                         log_debug("Failed to parse state value %s", value);
                 else
                         s->deserialized_state = state;
@@ -1759,6 +1812,26 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                         }
                 }
 
+        } else if (streq(key, "mqueue")) {
+                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 mqueue value %s", value);
+                else {
+
+                        LIST_FOREACH(port, p, s->ports)
+                                if (p->type == SOCKET_MQUEUE &&
+                                    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;
@@ -1803,6 +1876,34 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
         return 0;
 }
 
+static int socket_distribute_fds(Unit *u, FDSet *fds) {
+        Socket *s = SOCKET(u);
+        SocketPort *p;
+
+        assert(u);
+
+        LIST_FOREACH(port, p, s->ports) {
+                Iterator i;
+                int fd;
+
+                if (p->type != SOCKET_SOCKET)
+                        continue;
+
+                if (p->fd >= 0)
+                        continue;
+
+                FDSET_FOREACH(fd, fds, i) {
+                        if (socket_address_matches_fd(&p->address, fd)) {
+                                p->fd = fdset_remove(fds, fd);
+                                s->deserialized_state = SOCKET_LISTENING;
+                                break;
+                        }
+                }
+        }
+
+        return 0;
+}
+
 static UnitActiveState socket_active_state(Unit *u) {
         assert(u);
 
@@ -1848,7 +1949,8 @@ static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
         if (w->socket_accept) {
                 for (;;) {
 
-                        if ((cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK)) < 0) {
+                        cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
+                        if (cfd < 0) {
 
                                 if (errno == EINTR)
                                         continue;
@@ -1882,7 +1984,7 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 
         s->control_pid = 0;
 
-        if (is_clean_exit(code, status))
+        if (is_clean_exit(code, status, NULL))
                 f = SOCKET_SUCCESS;
         else if (code == CLD_EXITED)
                 f = SOCKET_FAILURE_EXIT_CODE;
@@ -1983,7 +2085,7 @@ static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
                 break;
 
         case SOCKET_STOP_PRE_SIGTERM:
-                if (s->exec_context.send_sigkill) {
+                if (s->kill_context.send_sigkill) {
                         log_warning("%s stopping timed out. Killing.", u->id);
                         socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT);
                 } else {
@@ -2003,7 +2105,7 @@ static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
                 break;
 
         case SOCKET_FINAL_SIGTERM:
-                if (s->exec_context.send_sigkill) {
+                if (s->kill_context.send_sigkill) {
                         log_warning("%s stopping timed out (2). Killing.", u->id);
                         socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT);
                 } else {
@@ -2102,7 +2204,7 @@ static void socket_reset_failed(Unit *u) {
         s->result = SOCKET_SUCCESS;
 }
 
-static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
+static int socket_kill(Unit *u, KillWho who, int signo, DBusError *error) {
         Socket *s = SOCKET(u);
         int r = 0;
         Set *pid_set = NULL;
@@ -2124,23 +2226,25 @@ static int socket_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError
                         if (kill(s->control_pid, signo) < 0)
                                 r = -errno;
 
-        if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
+        if (who == KILL_ALL) {
                 int q;
 
-                if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
+                pid_set = set_new(trivial_hash_func, trivial_compare_func);
+                if (!pid_set)
                         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) {
+                if (s->control_pid > 0) {
+                        q = set_put(pid_set, LONG_TO_PTR(s->control_pid));
+                        if (q < 0) {
                                 r = q;
                                 goto finish;
                         }
+                }
 
                 q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, false, pid_set, NULL);
-                if (q < 0)
-                        if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
-                                r = q;
+                if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT)
+                        r = q;
         }
 
 finish:
@@ -2190,6 +2294,8 @@ DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);
 
 const UnitVTable socket_vtable = {
         .object_size = sizeof(Socket),
+        .exec_context_offset = offsetof(Socket, exec_context),
+
         .sections =
                 "Unit\0"
                 "Socket\0"
@@ -2210,6 +2316,7 @@ const UnitVTable socket_vtable = {
 
         .serialize = socket_serialize,
         .deserialize_item = socket_deserialize_item,
+        .distribute_fds = socket_distribute_fds,
 
         .active_state = socket_active_state,
         .sub_state_to_string = socket_sub_state_to_string,