X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fsocket.c;h=2c9d693918facc7794aec846434af1223255744d;hp=751d8aa8fa5bf4479176d19fcf83c698a1026353;hb=5632e3743db350a67478acc107d76cdf648a1f99;hpb=bb00e604097fba830af1dc078d78aff278dfcd37 diff --git a/src/socket.c b/src/socket.c index 751d8aa8f..2c9d69391 100644 --- a/src/socket.c +++ b/src/socket.c @@ -36,6 +36,9 @@ #include "strv.h" #include "unit-name.h" #include "dbus-socket.h" +#include "missing.h" +#include "special.h" +#include "bus-errors.h" static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = { [SOCKET_DEAD] = UNIT_INACTIVE, @@ -49,7 +52,7 @@ static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = { [SOCKET_STOP_POST] = UNIT_DEACTIVATING, [SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING, [SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING, - [SOCKET_MAINTENANCE] = UNIT_INACTIVE, + [SOCKET_MAINTENANCE] = UNIT_MAINTENANCE }; static void socket_init(Unit *u) { @@ -65,6 +68,11 @@ static void socket_init(Unit *u) { 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->control_command_id = _SOCKET_EXEC_COMMAND_INVALID; @@ -121,6 +129,42 @@ static void socket_done(Unit *u) { } } +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 (s->service) + return 0; + + assert(s->accept); + + if (!(prefix = unit_name_to_prefix(s->meta.id))) + return -ENOMEM; + + r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted); + free(prefix); + + if (r < 0) + return -ENOMEM; + + r = manager_load_unit(s->meta.manager, name, NULL, NULL, &u); + free(name); + + if (r < 0) + return r; + + s->service = SERVICE(u); + return 0; +} + static bool have_non_accept_socket(Socket *s) { SocketPort *p; @@ -144,16 +188,26 @@ static bool have_non_accept_socket(Socket *s) { static int socket_verify(Socket *s) { assert(s); - if (UNIT(s)->meta.load_state != UNIT_LOADED) + if (s->meta.load_state != UNIT_LOADED) return 0; if (!s->ports) { - log_error("%s lacks Listen setting. Refusing.", UNIT(s)->meta.id); + log_error("%s lacks Listen setting. Refusing.", s->meta.id); + return -EINVAL; + } + + if (s->accept && have_non_accept_socket(s)) { + log_error("%s configured for accepting sockets, but sockets are non-accepting. Refusing.", s->meta.id); return -EINVAL; } if (s->accept && s->max_connections <= 0) { - log_error("%s's MaxConnection setting too small. Refusing.", UNIT(s)->meta.id); + log_error("%s's MaxConnection setting too small. Refusing.", s->meta.id); + return -EINVAL; + } + + if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { + log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id); return -EINVAL; } @@ -193,10 +247,7 @@ int socket_add_one_mount_link(Socket *s, Mount *m) { 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) + if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) return r; return 0; @@ -233,6 +284,17 @@ static int socket_add_device_link(Socket *s) { return r; } +static int socket_add_default_dependencies(Socket *s) { + int r; + assert(s); + + if (s->meta.manager->running_as == MANAGER_SYSTEM) + 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 int socket_load(Unit *u) { Socket *s = SOCKET(u); int r; @@ -247,7 +309,7 @@ static int socket_load(Unit *u) { if (u->meta.load_state == UNIT_LOADED) { if (have_non_accept_socket(s)) { - if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service))) + if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)) < 0) return r; if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service), true)) < 0) @@ -265,6 +327,10 @@ static int socket_load(Unit *u) { if ((r = unit_add_default_cgroup(u)) < 0) return r; + + if (s->meta.default_dependencies) + if ((r = socket_add_default_dependencies(s)) < 0) + return r; } return socket_verify(s); @@ -301,15 +367,17 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) { "%sSocket State: %s\n" "%sBindIPv6Only: %s\n" "%sBacklog: %u\n" - "%sKillMode: %s\n" "%sSocketMode: %04o\n" - "%sDirectoryMode: %04o\n", + "%sDirectoryMode: %04o\n" + "%sKeepAlive: %s\n" + "%sFreeBind: %s\n", prefix, socket_state_to_string(s->state), prefix, socket_address_bind_ipv6_only_to_string(s->bind_ipv6_only), prefix, s->backlog, - prefix, kill_mode_to_string(s->kill_mode), prefix, s->socket_mode, - prefix, s->directory_mode); + prefix, s->directory_mode, + prefix, yes_no(s->keep_alive), + prefix, yes_no(s->free_bind)); if (s->control_pid > 0) fprintf(f, @@ -330,6 +398,41 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) { 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); + LIST_FOREACH(port, p, s->ports) { if (p->type == SOCKET_SOCKET) { @@ -393,8 +496,7 @@ static int instance_from_socket(int fd, unsigned nr, char **instance) { b = ntohl(remote.in.sin_addr.s_addr); if (asprintf(&r, - "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u", - nr, + "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u", 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, @@ -416,8 +518,7 @@ static int instance_from_socket(int fd, unsigned nr, char **instance) { *b = remote.in6.sin6_addr.s6_addr+12; if (asprintf(&r, - "%u-%u.%u.%u.%u:%u-%u.%u.%u.%u:%u", - nr, + "%u.%u.%u.%u:%u-%u.%u.%u.%u:%u", a[0], a[1], a[2], a[3], ntohs(local.in6.sin6_port), b[0], b[1], b[2], b[3], @@ -427,8 +528,7 @@ static int instance_from_socket(int fd, unsigned nr, char **instance) { char a[INET6_ADDRSTRLEN], b[INET6_ADDRSTRLEN]; if (asprintf(&r, - "%u-%s:%u-%s:%u", - nr, + "%s:%u-%s:%u", 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)), @@ -488,12 +588,144 @@ static void socket_close_fds(Socket *s) { } } +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->priority >= 0) + if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0) + log_warning("SO_PRIORITY failed: %m"); + + if (s->receive_buffer > 0) { + int value = (int) s->receive_buffer; + if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0) + log_warning("SO_RCVBUF failed: %m"); + } + + if (s->send_buffer > 0) { + int value = (int) s->send_buffer; + if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0) + log_warning("SO_SNDBUF failed: %m"); + } + + if (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)); + x = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &s->ip_ttl, sizeof(s->ip_ttl)); + + if (r < 0 && x < 0) + log_warning("IP_TTL/IPV6_UNICAST_HOPS 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, + /* FIXME SELINUX: pass SELinux context object here */ + int *_fd) { + + int fd = -1, r; + struct stat st; + mode_t old_mask; + + assert(path); + assert(_fd); + + mkdir_parents(path, directory_mode); + + /* FIXME SELINUX: The mkfifo here should be done with + * the right SELinux context set */ + + /* 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) { + r = -errno; + goto fail; + } + + if ((fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) { + r = -errno; + goto fail; + } + + if (fstat(fd, &st) < 0) { + r = -errno; + goto fail; + } + + if (!S_ISFIFO(st.st_mode) || + st.st_mode != (socket_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; assert(s); + /* FIXME SELINUX: Somewhere here we must set the the SELinux + context for the created sockets and FIFOs. To figure out + the executable name for this, use + socket_instantiate_service() and then access the executable + path name via + s->service->exec_command[SERVICE_EXEC_START]->path. Example: + + if ((r = socket_instantiate_service(s)) < 0) + return r; + + log_debug("Socket unit %s will spawn service unit %s with executable path %s.", + s->meta.id, + s->service->meta.id, + s->service->exec_command[SERVICE_EXEC_START]->path); + */ + LIST_FOREACH(port, p, s->ports) { if (p->fd >= 0) @@ -506,39 +738,29 @@ static int socket_open_fds(Socket *s) { s->backlog, s->bind_ipv6_only, s->bind_to_device, + s->free_bind, s->directory_mode, s->socket_mode, + /* FIXME SELINUX: Pass the SELinux context object here */ &p->fd)) < 0) goto rollback; - } else { - struct stat st; - assert(p->type == SOCKET_FIFO); - - mkdir_parents(p->path, s->directory_mode); + socket_apply_socket_options(s, p->fd); - if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) { - r = -errno; - goto rollback; - } + } else if (p->type == SOCKET_FIFO) { - 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; + if ((r = fifo_address_create( + p->path, + s->directory_mode, + s->socket_mode, + /* FIXME SELINUX: Pass the SELinux context object here */ + &p->fd)) < 0) goto rollback; - } - /* FIXME verify user, access mode */ + socket_apply_fifo_options(s, p->fd); - if (!S_ISFIFO(st.st_mode)) { - r = -EEXIST; - goto rollback; - } - } + } else + assert_not_reached("Unknown port type"); } return 0; @@ -699,8 +921,9 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) { s->meta.manager->environment, true, true, - UNIT(s)->meta.manager->confirm_spawn, - UNIT(s)->meta.cgroup_bondings, + true, + s->meta.manager->confirm_spawn, + s->meta.cgroup_bondings, &pid); strv_free(argv); @@ -767,12 +990,12 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) { 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->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_mode == KILL_CONTROL_GROUP) { + if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) { - if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) { + if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig)) < 0) { if (r != -EAGAIN && r != -ESRCH) goto fail; } else @@ -780,7 +1003,7 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) { } if (!sent && s->control_pid > 0) - if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) { + if (kill(s->exec_context.kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) { r = -errno; goto fail; } @@ -903,17 +1126,37 @@ fail: 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 (s->meta.job && s->meta.job->type == JOB_STOP) { + if (cfd >= 0) + close_nointr_nofail(cfd); + else { + /* Flush all sockets by closing and reopening them */ + socket_close_fds(s); + + if ((r = socket_watch_fds(s)) < 0) { + log_warning("%s failed to watch sockets: %s", s->meta.id, strerror(-r)); + socket_enter_stop_pre(s, false); + } + } + + return; + } if (cfd < 0) { - if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0) + if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, &error, NULL)) < 0) goto fail; socket_set_state(s, SOCKET_RUNNING); } else { - Unit *u; - char *prefix, *instance, *name; + char *prefix, *instance = NULL, *name; + Service *service; if (s->n_connections >= s->max_connections) { log_warning("Too many incoming connections (%u)", s->n_connections); @@ -921,10 +1164,13 @@ static void socket_enter_running(Socket *s, int cfd) { return; } - if ((r = instance_from_socket(cfd, s->n_accepted++, &instance)) < 0) + if ((r = socket_instantiate_service(s)) < 0) goto fail; - if (!(prefix = unit_name_to_prefix(UNIT(s)->meta.id))) { + if ((r = instance_from_socket(cfd, s->n_accepted, &instance)) < 0) + goto fail; + + if (!(prefix = unit_name_to_prefix(s->meta.id))) { free(instance); r = -ENOMEM; goto fail; @@ -939,31 +1185,38 @@ static void socket_enter_running(Socket *s, int cfd) { goto fail; } - r = manager_load_unit(UNIT(s)->meta.manager, name, NULL, &u); - free(name); - - if (r < 0) + if ((r = unit_add_name(UNIT(s->service), name)) < 0) { + free(name); goto fail; + } + + service = s->service; + s->service = NULL; + s->n_accepted ++; - if ((r = service_set_socket_fd(SERVICE(u), cfd, s)) < 0) + unit_choose_id(UNIT(service), name); + free(name); + + if ((r = service_set_socket_fd(service, cfd, s)) < 0) goto fail; cfd = -1; - s->n_connections ++; - if ((r = manager_add_job(u->meta.manager, JOB_START, u, JOB_REPLACE, true, NULL)) < 0) + if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(service), JOB_REPLACE, true, &error, NULL)) < 0) goto fail; } return; fail: - log_warning("%s failed to queue socket startup job: %s", s->meta.id, strerror(-r)); + log_warning("%s failed to queue socket startup job: %s", s->meta.id, bus_error(&error, r)); socket_enter_stop_pre(s, false); if (cfd >= 0) close_nointr_nofail(cfd); + + dbus_error_free(&error); } static void socket_run_next(Socket *s, bool success) { @@ -1040,21 +1293,23 @@ static int socket_stop(Unit *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) + 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, true); + return -EAGAIN; + } + assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING); socket_enter_stop_pre(s, true); @@ -1248,6 +1503,8 @@ static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { break; } + + socket_apply_socket_options(s, cfd); } socket_enter_running(s, cfd); @@ -1270,12 +1527,17 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) { s->control_pid = 0; success = is_clean_exit(code, status); - s->failure = s->failure || !success; - if (s->control_command) - exec_status_fill(&s->control_command->exec_status, pid, code, status); + if (s->control_command) { + exec_status_exit(&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->ignore) + success = true; + } + + log_full(success ? LOG_DEBUG : LOG_NOTICE, + "%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); + s->failure = s->failure || !success; if (s->control_command && s->control_command->command_next && success) { log_debug("%s running next command for state %s", u->meta.id, socket_state_to_string(s->state)); @@ -1436,6 +1698,17 @@ void socket_connection_unref(Socket *s) { log_debug("%s: One connection closed, %u left.", s->meta.id, s->n_connections); } +static void socket_reset_maintenance(Unit *u) { + Socket *s = SOCKET(u); + + assert(s); + + if (s->state == SOCKET_MAINTENANCE) + socket_set_state(s, SOCKET_DEAD); + + s->failure = false; +} + static const char* const socket_state_table[_SOCKET_STATE_MAX] = { [SOCKET_DEAD] = "dead", [SOCKET_START_PRE] = "start-pre", @@ -1488,5 +1761,7 @@ const UnitVTable socket_vtable = { .sigchld_event = socket_sigchld_event, .timer_event = socket_timer_event, + .reset_maintenance = socket_reset_maintenance, + .bus_message_handler = bus_socket_message_handler };