chiark / gitweb /
socket: support socket activation of containers
[elogind.git] / src / core / socket.c
index f3f09cac4326133e8af4c9ecb3a8a4132fd3a0e7..324ec1e34bd03f0333f33f9aa7260e1fd09f54e8 100644 (file)
@@ -28,7 +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"
@@ -136,12 +138,6 @@ static void socket_done(Unit *u) {
         free(s->smack_ip_in);
         free(s->smack_ip_out);
 
-        free(s->socket_user);
-        s->socket_user = NULL;
-
-        free(s->socket_group);
-        s->socket_group = NULL;
-
         unit_unwatch_timer(u, &s->timer_watch);
 }
 
@@ -455,16 +451,6 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
                 prefix, yes_no(s->pass_sec),
                 prefix, strna(s->tcp_congestion));
 
-        if (s->socket_user)
-                fprintf(f,
-                        "SocketUser: %s\n",
-                        s->socket_user);
-
-        if (s->socket_group)
-                fprintf(f,
-                        "SocketGroup: %s\n",
-                        s->socket_group);
-
         if (s->control_pid > 0)
                 fprintf(f,
                         "%sControl PID: %lu\n",
@@ -708,9 +694,6 @@ static void socket_close_fds(Socket *s) {
 }
 
 static void socket_apply_socket_options(Socket *s, int fd) {
-        uid_t uid = 0;
-        gid_t gid = 0;
-
         assert(s);
         assert(fd >= 0);
 
@@ -787,6 +770,7 @@ static void socket_apply_socket_options(Socket *s, int fd) {
                 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");
@@ -794,21 +778,7 @@ static void socket_apply_socket_options(Socket *s, int fd) {
         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");
-
-        if (s->socket_user &&
-            get_user_creds((const char **)&s->socket_user, &uid,
-                                NULL, NULL, NULL) < 0) {
-                log_warning("failed to lookup user: %s", s->socket_user);
-        }
-
-        if (s->socket_group &&
-            get_group_creds((const char **)&s->socket_group, &gid) < 0) {
-                log_warning("failed to lookup group: %s", s->socket_group);
-        }
-
-        if ((uid != 0 || gid != 0) && fchown(fd, uid, gid) < 0) {
-                log_warning("failed to change ownership of socket");
-        }
+#endif
 }
 
 static void socket_apply_fifo_options(Socket *s, int fd) {
@@ -819,24 +789,22 @@ static void socket_apply_fifo_options(Socket *s, int fd) {
                 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(
                 const char *path,
                 mode_t directory_mode,
                 mode_t socket_mode,
-                const char *socket_user,
-                const char *socket_group,
                 int *_fd) {
 
         int fd = -1, r = 0;
         struct stat st;
         mode_t old_mask;
-        uid_t uid = 0;
-        gid_t gid = 0;
 
         assert(path);
         assert(_fd);
@@ -861,8 +829,7 @@ static int fifo_address_create(
                 goto fail;
         }
 
-        fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW);
-        if (fd < 0) {
+        if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
                 r = -errno;
                 goto fail;
         }
@@ -874,35 +841,15 @@ static int fifo_address_create(
                 goto fail;
         }
 
-        if (socket_user &&
-            get_user_creds(&socket_user, &uid, NULL, NULL, NULL) < 0) {
-                r = -errno;
-                log_error("failed to lookup user: %s", socket_user);
-                goto fail;
-        }
-
-        if (socket_group &&
-            get_group_creds(&socket_group, &gid) < 0) {
-                r = -errno;
-                log_error("failed to lookup group: %s", socket_group);
-                goto fail;
-        }
-
         if (!S_ISFIFO(st.st_mode) ||
             (st.st_mode & 0777) != (socket_mode & ~old_mask) ||
-            st.st_uid != uid ||
-            st.st_gid != gid) {
+            st.st_uid != getuid() ||
+            st.st_gid != getgid()) {
 
                 r = -EEXIST;
                 goto fail;
         }
 
-        if ((uid != 0 || gid != 0) && fchown(fd, uid, gid) < 0) {
-                r = -errno;
-                log_error("failed to changed ownership of FIFO: %s", path);
-                goto fail;
-        }
-
         *_fd = fd;
         return 0;
 
@@ -1072,8 +1019,6 @@ static int socket_open_fds(Socket *s) {
                                              p->path,
                                              s->directory_mode,
                                              s->socket_mode,
-                                             s->socket_user,
-                                             s->socket_group,
                                              &p->fd)) < 0)
                                 goto rollback;
 
@@ -1201,10 +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;
                 }
 
@@ -1236,10 +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;
         }
@@ -1361,7 +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);
@@ -1534,7 +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;
                 }
@@ -1603,7 +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)
@@ -1752,7 +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)
@@ -1762,6 +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);
@@ -1782,7 +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;
@@ -1858,6 +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;
@@ -1902,6 +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);
 
@@ -2314,6 +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,