diff options
Diffstat (limited to 'src/socket.c')
| -rw-r--r-- | src/socket.c | 1411 |
1 files changed, 1411 insertions, 0 deletions
diff --git a/src/socket.c b/src/socket.c new file mode 100644 index 0000000000..259f2733cc --- /dev/null +++ b/src/socket.c @@ -0,0 +1,1411 @@ +/*-*- Mode: C; c-basic-offset: 8 -*-*/ + +/*** + 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 "unit.h" +#include "socket.h" +#include "log.h" +#include "load-dropin.h" +#include "load-fragment.h" +#include "strv.h" +#include "unit-name.h" +#include "dbus-socket.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_MAINTAINANCE] = UNIT_INACTIVE, +}; + +static void socket_init(Unit *u) { + Socket *s = SOCKET(u); + + assert(u); + assert(u->meta.load_state == UNIT_STUB); + + s->timer_watch.type = WATCH_INVALID; + s->backlog = SOMAXCONN; + s->timeout_usec = DEFAULT_TIMEOUT_USEC; + s->directory_mode = 0755; + s->socket_mode = 0666; + + exec_context_init(&s->exec_context); + + 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); + + s->service = NULL; + + free(s->bind_to_device); + s->bind_to_device = NULL; + + unit_unwatch_timer(u, &s->timer_watch); +} + +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)->meta.load_state != UNIT_LOADED) + return 0; + + if (!s->ports) { + log_error("%s lacks Listen setting. Refusing.", UNIT(s)->meta.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 { + assert(p->type == SOCKET_FIFO); + 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 (s->meta.load_state != UNIT_LOADED || + m->meta.load_state != UNIT_LOADED) + return 0; + + if (!socket_needs_mount(s, m->where)) + return 0; + + if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(s), true)) < 0) + return r; + + if ((r = unit_add_dependency(UNIT(s), UNIT_REQUIRES, UNIT(m), true)) < 0) + return r; + + return 0; +} + +static int socket_add_mount_links(Socket *s) { + Meta *other; + int r; + + assert(s); + + LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_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_load(Unit *u) { + Socket *s = SOCKET(u); + int r; + + assert(u); + assert(u->meta.load_state == UNIT_STUB); + + if ((r = unit_load_fragment_and_dropin(u)) < 0) + return r; + + /* This is a new unit? Then let's add in some extras */ + if (u->meta.load_state == UNIT_LOADED) { + + if (have_non_accept_socket(s)) { + if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service))) + return r; + + if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0) + return r; + } + + if ((r = socket_add_mount_links(s)) < 0) + return r; + + if ((r = socket_add_device_link(s)) < 0) + return r; + + if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) + return r; + + if ((r = unit_add_default_cgroup(u)) < 0) + return r; + } + + return socket_verify(s); +} + +static const char* listen_lookup(int type) { + + 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" + "%sBindIPv6Only: %s\n" + "%sBacklog: %u\n" + "%sKillMode: %s\n" + "%sSocketMode: %04o\n" + "%sDirectoryMode: %04o\n", + prefix, socket_state_to_string(s->state), + prefix, yes_no(s->bind_ipv6_only), + prefix, s->backlog, + prefix, kill_mode_to_string(s->kill_mode), + prefix, s->socket_mode, + prefix, s->directory_mode); + + if (s->control_pid > 0) + fprintf(f, + "%sControl PID: %llu\n", + prefix, (unsigned long 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", + prefix, s->n_accepted); + + LIST_FOREACH(port, p, s->ports) { + + if (p->type == SOCKET_SOCKET) { + const char *t; + int r; + char *k; + + if ((r = socket_address_print(&p->address, &k)) < 0) + t = strerror(-r); + else + t = k; + + fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k); + free(k); + } 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: { + 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-%llu-%llu", + nr, + (unsigned long long) ucred.pid, + (unsigned long 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 int socket_open_fds(Socket *s) { + SocketPort *p; + int r; + + assert(s); + + LIST_FOREACH(port, p, s->ports) { + + if (p->fd >= 0) + continue; + + if (p->type == SOCKET_SOCKET) { + + if ((r = socket_address_listen( + &p->address, + s->backlog, + s->bind_ipv6_only, + s->bind_to_device, + s->directory_mode, + s->socket_mode, + &p->fd)) < 0) + goto rollback; + + } else { + struct stat st; + assert(p->type == SOCKET_FIFO); + + mkdir_parents(p->path, s->directory_mode); + + if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) { + r = -errno; + goto rollback; + } + + if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) { + r = -errno; + goto rollback; + } + + if (fstat(p->fd, &st) < 0) { + r = -errno; + goto rollback; + } + + /* FIXME verify user, access mode */ + + if (!S_ISFIFO(st.st_mode)) { + r = -EEXIST; + goto rollback; + } + } + } + + return 0; + +rollback: + socket_close_fds(s); + 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", + s->meta.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]); +} + +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, + s->meta.manager->environment, + true, + true, + UNIT(s)->meta.manager->confirm_spawn, + UNIT(s)->meta.cgroup_bondings, + &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, bool success) { + assert(s); + + if (!success) + s->failure = true; + + socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD); +} + +static void socket_enter_signal(Socket *s, SocketState state, bool success); + +static void socket_enter_stop_post(Socket *s, bool success) { + int r; + assert(s); + + if (!success) + s->failure = true; + + 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, true); + + return; + +fail: + log_warning("%s failed to run stop-post executable: %s", s->meta.id, strerror(-r)); + socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false); +} + +static void socket_enter_signal(Socket *s, SocketState state, bool success) { + int r; + bool sent = false; + + assert(s); + + if (!success) + s->failure = true; + + if (s->kill_mode != KILL_NONE) { + int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? SIGTERM : SIGKILL; + + if (s->kill_mode == KILL_CONTROL_GROUP) { + + if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) { + if (r != -EAGAIN && r != -ESRCH) + goto fail; + } else + sent = true; + } + + if (!sent && s->control_pid > 0) + if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) { + r = -errno; + goto fail; + } + } + + if (sent && s->control_pid > 0) { + 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, true); + else + socket_enter_dead(s, true); + + return; + +fail: + log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r)); + + if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL) + socket_enter_stop_post(s, false); + else + socket_enter_dead(s, false); +} + +static void socket_enter_stop_pre(Socket *s, bool success) { + int r; + assert(s); + + if (!success) + s->failure = true; + + 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, true); + + return; + +fail: + log_warning("%s failed to run stop-pre executable: %s", s->meta.id, strerror(-r)); + socket_enter_stop_post(s, false); +} + +static void socket_enter_listening(Socket *s) { + int r; + assert(s); + + if ((r = socket_watch_fds(s)) < 0) { + log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r)); + goto fail; + } + + socket_set_state(s, SOCKET_LISTENING); + return; + +fail: + socket_enter_stop_pre(s, false); +} + +static void socket_enter_start_post(Socket *s) { + int r; + assert(s); + + if ((r = socket_open_fds(s)) < 0) { + log_warning("%s failed to listen on sockets: %s", s->meta.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])) { + if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) { + log_warning("%s failed to run start-post executable: %s", s->meta.id, strerror(-r)); + goto fail; + } + + socket_set_state(s, SOCKET_START_POST); + } else + socket_enter_listening(s); + + return; + +fail: + socket_enter_stop_pre(s, false); +} + +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 exectuable: %s", s->meta.id, strerror(-r)); + socket_enter_dead(s, false); +} + +static void socket_enter_running(Socket *s, int cfd) { + int r; + + assert(s); + + if (cfd < 0) { + if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0) + goto fail; + + socket_set_state(s, SOCKET_RUNNING); + } else { + Unit *u; + char *prefix, *instance, *name; + + if ((r = instance_from_socket(cfd, s->n_accepted++, &instance))) + goto fail; + + if (!(prefix = unit_name_to_prefix(UNIT(s)->meta.id))) { + free(instance); + r = -ENOMEM; + goto fail; + } + + name = unit_name_build(prefix, instance, ".service"); + free(prefix); + free(instance); + + if (!name) + r = -ENOMEM; + + r = manager_load_unit(UNIT(s)->meta.manager, name, NULL, &u); + free(name); + + if (r < 0) + goto fail; + + if ((r = service_set_socket_fd(SERVICE(u), cfd) < 0)) + goto fail; + + cfd = -1; + + if ((r = manager_add_job(u->meta.manager, JOB_START, u, JOB_REPLACE, true, NULL)) < 0) + goto fail; + } + + return; + +fail: + log_warning("%s failed to queue socket startup job: %s", s->meta.id, strerror(-r)); + socket_enter_stop_pre(s, false); + + if (cfd >= 0) + close_nointr_nofail(cfd); +} + +static void socket_run_next(Socket *s, bool success) { + int r; + + assert(s); + assert(s->control_command); + assert(s->control_command->command_next); + + if (!success) + s->failure = true; + + 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 spawn next executable: %s", s->meta.id, strerror(-r)); + + if (s->state == SOCKET_START_POST) + socket_enter_stop_pre(s, false); + else if (s->state == SOCKET_STOP_POST) + socket_enter_dead(s, false); + else + socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false); +} + +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 (s->service) { + if (s->service->meta.load_state != UNIT_LOADED) + return -ENOENT; + + /* If the service is alredy actvie we cannot start the + * socket */ + if (s->service->state != SERVICE_DEAD && + s->service->state != SERVICE_MAINTAINANCE && + s->service->state != SERVICE_AUTO_RESTART) + return -EBUSY; + } + + assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE); + + s->failure = false; + socket_enter_start_pre(s); + return 0; +} + +static int socket_stop(Unit *u) { + Socket *s = SOCKET(u); + + assert(s); + + /* We cannot fulfill this request right now, try again later + * please! */ + if (s->state == SOCKET_START_PRE || + s->state == SOCKET_START_POST) + return -EAGAIN; + + /* 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_SIGTERM) + return 0; + + assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING); + + socket_enter_stop_pre(s, true); + 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, "failure", yes_no(s->failure)); + 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", "%u", (unsigned) 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; + + unit_serialize_item_format(u, f, "socket", "%i %s", copy, t); + free(t); + } 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); + int r; + + 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, "failure")) { + int b; + + if ((b = parse_boolean(value)) < 0) + log_debug("Failed to parse failure value %s", value); + else + s->failure = b || s->failure; + + } else if (streq(key, "n-accepted")) { + unsigned k; + + if ((r = 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")) { + unsigned pid; + + if ((r = safe_atou(value, &pid)) < 0 || pid <= 0) + log_debug("Failed to parse control-pid value %s", value); + else + s->control_pid = (pid_t) 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 (streq(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, 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(&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 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); + + log_debug("Incoming traffic on %s", u->meta.id); + + if (events != EPOLLIN) { + log_error("Got invalid poll event on socket."); + 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_enter_running(s, cfd); + return; + +fail: + socket_enter_stop_pre(s, false); +} + +static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) { + Socket *s = SOCKET(u); + bool success; + + assert(s); + assert(pid >= 0); + + success = is_clean_exit(code, status); + s->failure = s->failure || !success; + + assert(s->control_pid == pid); + s->control_pid = 0; + + if (s->control_command) + exec_status_fill(&s->control_command->exec_status, pid, code, status); + + log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); + + if (s->control_command && s->control_command->command_next && success) { + log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state)); + socket_run_next(s, success); + } 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->meta.id, socket_state_to_string(s->state)); + + switch (s->state) { + + case SOCKET_START_PRE: + if (success) + socket_enter_start_post(s); + else + socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false); + break; + + case SOCKET_START_POST: + if (success) + socket_enter_listening(s); + else + socket_enter_stop_pre(s, false); + break; + + case SOCKET_STOP_PRE: + case SOCKET_STOP_PRE_SIGTERM: + case SOCKET_STOP_PRE_SIGKILL: + socket_enter_stop_post(s, success); + break; + + case SOCKET_STOP_POST: + case SOCKET_FINAL_SIGTERM: + case SOCKET_FINAL_SIGKILL: + socket_enter_dead(s, success); + break; + + default: + assert_not_reached("Uh, control process died at wrong time."); + } + } +} + +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->meta.id); + socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false); + + case SOCKET_START_POST: + log_warning("%s starting timed out. Stopping.", u->meta.id); + socket_enter_stop_pre(s, false); + break; + + case SOCKET_STOP_PRE: + log_warning("%s stopping timed out. Terminating.", u->meta.id); + socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false); + break; + + case SOCKET_STOP_PRE_SIGTERM: + log_warning("%s stopping timed out. Killing.", u->meta.id); + socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false); + break; + + case SOCKET_STOP_PRE_SIGKILL: + log_warning("%s still around after SIGKILL. Ignoring.", u->meta.id); + socket_enter_stop_post(s, false); + break; + + case SOCKET_STOP_POST: + log_warning("%s stopping timed out (2). Terminating.", u->meta.id); + socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false); + break; + + case SOCKET_FINAL_SIGTERM: + log_warning("%s stopping timed out (2). Killing.", u->meta.id); + socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false); + break; + + case SOCKET_FINAL_SIGKILL: + log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", u->meta.id); + socket_enter_dead(s, false); + 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 (!(rfds = new(int, rn_fds)) < 0) + 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) { + assert(s); + + /* The service is dead. Dang. */ + + if (s->state == SOCKET_RUNNING) { + log_debug("%s got notified about service death.", s->meta.id); + socket_enter_listening(s); + } +} + +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_MAINTAINANCE] = "maintainance" +}; + +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); + +const UnitVTable socket_vtable = { + .suffix = ".socket", + + .init = socket_init, + .done = socket_done, + .load = socket_load, + + .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, + + .fd_event = socket_fd_event, + .sigchld_event = socket_sigchld_event, + .timer_event = socket_timer_event, + + .bus_message_handler = bus_socket_message_handler +}; |