/*-*- 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include #include #include #include #include #include #include #include #include #include "sd-event.h" #include "alloc-util.h" #include "bus-error.h" #include "bus-util.h" #include "copy.h" #include "dbus-socket.h" #include "def.h" #include "exit-status.h" #include "fd-util.h" #include "formats-util.h" #include "label.h" #include "log.h" #include "missing.h" #include "mkdir.h" #include "parse-util.h" #include "path-util.h" #include "process-util.h" #include "selinux-util.h" #include "signal-util.h" #include "smack-util.h" #include "socket.h" #include "special.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "unit-name.h" #include "unit-printf.h" #include "unit.h" #include "user-util.h" static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = { [SOCKET_DEAD] = UNIT_INACTIVE, [SOCKET_START_PRE] = UNIT_ACTIVATING, [SOCKET_START_CHOWN] = 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 int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); static int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); static void socket_init(Unit *u) { Socket *s = SOCKET(u); assert(u); assert(u->load_state == UNIT_STUB); s->backlog = SOMAXCONN; s->timeout_usec = u->manager->default_timeout_start_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; 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_cleanup_fd_list(SocketPort *p) { assert(p); close_many(p->auxiliary_fds, p->n_auxiliary_fds); p->auxiliary_fds = mfree(p->auxiliary_fds); p->n_auxiliary_fds = 0; } void socket_free_ports(Socket *s) { SocketPort *p; assert(s); while ((p = s->ports)) { LIST_REMOVE(port, s->ports, p); sd_event_source_unref(p->event_source); socket_cleanup_fd_list(p); safe_close(p->fd); free(p->path); free(p); } } static void socket_done(Unit *u) { Socket *s = SOCKET(u); assert(s); socket_free_ports(s); s->exec_runtime = exec_runtime_unref(s->exec_runtime); 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); s->tcp_congestion = mfree(s->tcp_congestion); s->bind_to_device = mfree(s->bind_to_device); free(s->smack); free(s->smack_ip_in); free(s->smack_ip_out); strv_free(s->symlinks); free(s->user); free(s->group); s->timer_event_source = sd_event_source_unref(s->timer_event_source); } static int socket_arm_timer(Socket *s) { int r; assert(s); if (s->timeout_usec <= 0) { s->timer_event_source = sd_event_source_unref(s->timer_event_source); return 0; } if (s->timer_event_source) { r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec); if (r < 0) return r; return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); } r = sd_event_add_time( UNIT(s)->manager->event, &s->timer_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + s->timeout_usec, 0, socket_dispatch_timer, s); if (r < 0) return r; (void) sd_event_source_set_description(s->timer_event_source, "socket-timer"); return 0; } int socket_instantiate_service(Socket *s) { _cleanup_free_ char *prefix = NULL, *name = NULL; 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; if (!s->accept) return 0; r = unit_name_to_prefix(UNIT(s)->id, &prefix); if (r < 0) return r; if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0) return -ENOMEM; r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u); if (r < 0) return r; 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_add_mount_links(Socket *s) { SocketPort *p; int r; assert(s); LIST_FOREACH(port, p, s->ports) { const char *path = NULL; if (p->type == SOCKET_SOCKET) path = socket_address_get_path(&p->address); else if (IN_SET(p->type, SOCKET_FIFO, SOCKET_SPECIAL, SOCKET_USB_FUNCTION)) path = p->path; if (!path) continue; r = unit_require_mounts_for(UNIT(s), path); if (r < 0) return r; } return 0; } static int socket_add_device_link(Socket *s) { char *t; assert(s); if (!s->bind_to_device || streq(s->bind_to_device, "lo")) return 0; t = strjoina("/sys/subsystem/net/devices/", s->bind_to_device); return unit_add_node_link(UNIT(s), t, false, UNIT_BINDS_TO); } static int socket_add_default_dependencies(Socket *s) { int r; assert(s); if (!UNIT(s)->default_dependencies) return 0; r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SOCKETS_TARGET, NULL, true); if (r < 0) return r; if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) { r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); if (r < 0) return r; } return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); } _pure_ 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_add_extras(Socket *s) { Unit *u = UNIT(s); int r; assert(s); 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; } r = socket_add_mount_links(s); if (r < 0) return r; r = socket_add_device_link(s); if (r < 0) return r; r = unit_patch_contexts(u); if (r < 0) return r; if (socket_has_exec(s)) { r = unit_add_exec_dependencies(u, &s->exec_context); if (r < 0) return r; r = unit_set_default_slice(u); if (r < 0) return r; } r = socket_add_default_dependencies(s); if (r < 0) return r; return 0; } static const char *socket_find_symlink_target(Socket *s) { const char *found = NULL; SocketPort *p; LIST_FOREACH(port, p, s->ports) { const char *f = NULL; switch (p->type) { case SOCKET_FIFO: f = p->path; break; case SOCKET_SOCKET: if (p->address.sockaddr.un.sun_path[0] != 0) f = p->address.sockaddr.un.sun_path; break; default: break; } if (f) { if (found) return NULL; found = f; } } return found; } static int socket_verify(Socket *s) { assert(s); if (UNIT(s)->load_state != UNIT_LOADED) return 0; if (!s->ports) { log_unit_error(UNIT(s), "Unit lacks Listen setting. Refusing."); return -EINVAL; } if (s->accept && have_non_accept_socket(s)) { log_unit_error(UNIT(s), "Unit configured for accepting sockets, but sockets are non-accepting. Refusing."); return -EINVAL; } if (s->accept && s->max_connections <= 0) { log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing."); return -EINVAL; } if (s->accept && UNIT_DEREF(s->service)) { log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing."); return -EINVAL; } if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing."); return -EINVAL; } if (!strv_isempty(s->symlinks) && !socket_find_symlink_target(s)) { log_unit_error(UNIT(s), "Unit has symlinks set but none or more than one node in the file system. Refusing."); return -EINVAL; } return 0; } static int socket_load(Unit *u) { Socket *s = SOCKET(u); int r; assert(u); assert(u->load_state == UNIT_STUB); r = unit_load_fragment_and_dropin(u); if (r < 0) return r; if (u->load_state == UNIT_LOADED) { /* This is a new unit? Then let's add in some extras */ r = socket_add_extras(s); if (r < 0) return r; } return socket_verify(s); } _const_ 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) { char time_string[FORMAT_TIMESPAN_MAX]; SocketExecCommand c; Socket *s = SOCKET(u); SocketPort *p; const char *prefix2; assert(s); assert(f); prefix = strempty(prefix); prefix2 = strjoina(prefix, "\t"); fprintf(f, "%sSocket State: %s\n" "%sResult: %s\n" "%sBindIPv6Only: %s\n" "%sBacklog: %u\n" "%sSocketMode: %04o\n" "%sDirectoryMode: %04o\n" "%sKeepAlive: %s\n" "%sNoDelay: %s\n" "%sFreeBind: %s\n" "%sTransparent: %s\n" "%sBroadcast: %s\n" "%sPassCredentials: %s\n" "%sPassSecurity: %s\n" "%sTCPCongestion: %s\n" "%sRemoveOnStop: %s\n" "%sWritable: %s\n" "%sFDName: %s\n" "%sSELinuxContextFromNet: %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->no_delay), 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), prefix, yes_no(s->remove_on_stop), prefix, yes_no(s->writable), prefix, socket_fdname(s), prefix, yes_no(s->selinux_context_from_net)); if (s->control_pid > 0) fprintf(f, "%sControl PID: "PID_FMT"\n", prefix, 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); if (s->reuse_port) fprintf(f, "%sReusePort: %s\n", prefix, yes_no(s->reuse_port)); 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); if (!isempty(s->user) || !isempty(s->group)) fprintf(f, "%sOwnerUser: %s\n" "%sOwnerGroup: %s\n", prefix, strna(s->user), prefix, strna(s->group)); if (s->keep_alive_time > 0) fprintf(f, "%sKeepAliveTimeSec: %s\n", prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_time, USEC_PER_SEC)); if (s->keep_alive_interval) fprintf(f, "%sKeepAliveIntervalSec: %s\n", prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->keep_alive_interval, USEC_PER_SEC)); if (s->keep_alive_cnt) fprintf(f, "%sKeepAliveProbes: %u\n", prefix, s->keep_alive_cnt); if (s->defer_accept) fprintf(f, "%sDeferAcceptSec: %s\n", prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->defer_accept, USEC_PER_SEC)); LIST_FOREACH(port, p, s->ports) { if (p->type == SOCKET_SOCKET) { const char *t; int r; char *k = NULL; r = socket_address_print(&p->address, &k); if (r < 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_USB_FUNCTION) fprintf(f, "%sListenUSBFunction: %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); kill_context_dump(&s->kill_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); } } static int instance_from_socket(int fd, unsigned nr, char **instance) { socklen_t l; char *r; union sockaddr_union 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 unsigned 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; int k; k = getpeercred(fd, &ucred); if (k >= 0) { if (asprintf(&r, "%u-"PID_FMT"-"UID_FMT, nr, ucred.pid, ucred.uid) < 0) return -ENOMEM; } else if (k == -ENODATA) { /* This handles the case where somebody is * connecting from another pid/uid namespace * (e.g. from outside of our container). */ if (asprintf(&r, "%u-unknown", nr) < 0) return -ENOMEM; } else return k; break; } default: assert_not_reached("Unhandled socket type."); } *instance = r; return 0; } static void socket_close_fds(Socket *s) { SocketPort *p; char **i; assert(s); LIST_FOREACH(port, p, s->ports) { p->event_source = sd_event_source_unref(p->event_source); if (p->fd < 0) continue; p->fd = safe_close(p->fd); socket_cleanup_fd_list(p); /* One little note: we should normally not 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! */ if (s->remove_on_stop) { switch (p->type) { case SOCKET_FIFO: unlink(p->path); break; case SOCKET_MQUEUE: mq_unlink(p->path); break; case SOCKET_SOCKET: socket_address_unlink(&p->address); break; default: break; } } } if (s->remove_on_stop) STRV_FOREACH(i, s->symlinks) unlink(*i); } static void socket_apply_socket_options(Socket *s, int fd) { int r; 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_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m"); } if (s->keep_alive_time) { int value = s->keep_alive_time / USEC_PER_SEC; if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0) log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPIDLE failed: %m"); } if (s->keep_alive_interval) { int value = s->keep_alive_interval / USEC_PER_SEC; if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0) log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPINTVL failed: %m"); } if (s->keep_alive_cnt) { int value = s->keep_alive_cnt; if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &value, sizeof(value)) < 0) log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPCNT failed: %m"); } if (s->defer_accept) { int value = s->defer_accept / USEC_PER_SEC; if (setsockopt(fd, SOL_TCP, TCP_DEFER_ACCEPT, &value, sizeof(value)) < 0) log_unit_warning_errno(UNIT(s), errno, "TCP_DEFER_ACCEPT failed: %m"); } if (s->no_delay) { int b = s->no_delay; if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0) log_unit_warning_errno(UNIT(s), errno, "TCP_NODELAY failed: %m"); } if (s->broadcast) { int one = 1; if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0) log_unit_warning_errno(UNIT(s), errno, "SO_BROADCAST failed: %m"); } if (s->pass_cred) { int one = 1; if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) log_unit_warning_errno(UNIT(s), errno, "SO_PASSCRED failed: %m"); } if (s->pass_sec) { int one = 1; if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0) log_unit_warning_errno(UNIT(s), errno, "SO_PASSSEC failed: %m"); } if (s->priority >= 0) if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &s->priority, sizeof(s->priority)) < 0) log_unit_warning_errno(UNIT(s), errno, "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_unit_warning_errno(UNIT(s), errno, "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_unit_warning_errno(UNIT(s), errno, "SO_SNDBUF failed: %m"); } if (s->mark >= 0) if (setsockopt(fd, SOL_SOCKET, SO_MARK, &s->mark, sizeof(s->mark)) < 0) log_unit_warning_errno(UNIT(s), errno, "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_unit_warning_errno(UNIT(s), errno, "IP_TOS failed: %m"); if (s->ip_ttl >= 0) { int 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_unit_warning_errno(UNIT(s), errno, "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_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m"); if (s->smack_ip_in) { r = mac_smack_apply_fd(fd, SMACK_ATTR_IPIN, s->smack_ip_in); if (r < 0) log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_in_fd: %m"); } if (s->smack_ip_out) { r = mac_smack_apply_fd(fd, SMACK_ATTR_IPOUT, s->smack_ip_out); if (r < 0) log_unit_error_errno(UNIT(s), r, "mac_smack_apply_ip_out_fd: %m"); } } static void socket_apply_fifo_options(Socket *s, int fd) { int r; assert(s); assert(fd >= 0); if (s->pipe_size > 0) if (fcntl(fd, F_SETPIPE_SZ, s->pipe_size) < 0) log_unit_warning_errno(UNIT(s), errno, "Setting pipe size failed, ignoring: %m"); if (s->smack) { r = mac_smack_apply_fd(fd, SMACK_ATTR_ACCESS, s->smack); if (r < 0) log_unit_error_errno(UNIT(s), r, "SMACK relabelling failed, ignoring: %m"); } } static int fifo_address_create( const char *path, mode_t directory_mode, mode_t socket_mode) { _cleanup_close_ int fd = -1; mode_t old_mask; struct stat st; int r; assert(path); mkdir_parents_label(path, directory_mode); r = mac_selinux_create_file_prepare(path, S_IFIFO); if (r < 0) return r; /* Enforce the right access mode for the fifo */ old_mask = umask(~ socket_mode); /* Include the original umask in our mask */ (void) umask(~socket_mode | old_mask); r = mkfifo(path, socket_mode); (void) umask(old_mask); if (r < 0 && errno != EEXIST) { r = -errno; goto fail; } fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK | O_NOFOLLOW); if (fd < 0) { r = -errno; goto fail; } mac_selinux_create_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; } r = fd; fd = -1; return r; fail: mac_selinux_create_file_clear(); return r; } static int special_address_create(const char *path, bool writable) { _cleanup_close_ int fd = -1; struct stat st; int r; assert(path); fd = open(path, (writable ? O_RDWR : O_RDONLY)|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW); if (fd < 0) return -errno; if (fstat(fd, &st) < 0) return -errno; /* Check whether this is a /proc, /sys or /dev file or char device */ if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) return -EEXIST; r = fd; fd = -1; return r; } static int usbffs_address_create(const char *path) { _cleanup_close_ int fd = -1; struct stat st; int r; assert(path); fd = open(path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW); if (fd < 0) return -errno; if (fstat(fd, &st) < 0) return -errno; /* Check whether this is a regular file (ffs endpoint)*/ if (!S_ISREG(st.st_mode)) return -EEXIST; r = fd; fd = -1; return r; } static int mq_address_create( const char *path, mode_t mq_mode, long maxmsg, long msgsize) { _cleanup_close_ int fd = -1; struct stat st; mode_t old_mask; struct mq_attr _attr, *attr = NULL; int r; assert(path); if (maxmsg > 0 && msgsize > 0) { _attr = (struct mq_attr) { .mq_flags = O_NONBLOCK, .mq_maxmsg = maxmsg, .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 */ (void) umask(~mq_mode | old_mask); fd = mq_open(path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_CREAT, mq_mode, attr); (void) umask(old_mask); if (fd < 0) return -errno; if (fstat(fd, &st) < 0) return -errno; if ((st.st_mode & 0777) != (mq_mode & ~old_mask) || st.st_uid != getuid() || st.st_gid != getgid()) return -EEXIST; r = fd; fd = -1; return r; } static int socket_symlink(Socket *s) { const char *p; char **i; assert(s); p = socket_find_symlink_target(s); if (!p) return 0; STRV_FOREACH(i, s->symlinks) symlink_label(p, *i); return 0; } static int usbffs_write_descs(int fd, Service *s) { int r; if (!s->usb_function_descriptors || !s->usb_function_strings) return -EINVAL; r = copy_file_fd(s->usb_function_descriptors, fd, false); if (r < 0) return r; return copy_file_fd(s->usb_function_strings, fd, false); } static int usbffs_select_ep(const struct dirent *d) { return d->d_name[0] != '.' && !streq(d->d_name, "ep0"); } static int usbffs_dispatch_eps(SocketPort *p) { _cleanup_free_ struct dirent **ent = NULL; _cleanup_free_ char *path = NULL; int r, i, n, k; path = dirname_malloc(p->path); if (!path) return -ENOMEM; r = scandir(path, &ent, usbffs_select_ep, alphasort); if (r < 0) return -errno; n = r; p->auxiliary_fds = new(int, n); if (!p->auxiliary_fds) return -ENOMEM; p->n_auxiliary_fds = n; k = 0; for (i = 0; i < n; ++i) { _cleanup_free_ char *ep = NULL; ep = path_make_absolute(ent[i]->d_name, path); if (!ep) return -ENOMEM; path_kill_slashes(ep); r = usbffs_address_create(ep); if (r < 0) goto fail; p->auxiliary_fds[k] = r; ++k; free(ent[i]); } return r; fail: close_many(p->auxiliary_fds, k); p->auxiliary_fds = mfree(p->auxiliary_fds); p->n_auxiliary_fds = 0; return r; } static int socket_open_fds(Socket *s) { _cleanup_(mac_selinux_freep) char *label = NULL; bool know_label = false; SocketPort *p; int r; assert(s); LIST_FOREACH(port, p, s->ports) { if (p->fd >= 0) continue; switch (p->type) { case SOCKET_SOCKET: if (!know_label) { /* Figure out label, if we don't it know * yet. We do it once, for the first * socket where we need this and * remember it for the rest. */ if (s->selinux_context_from_net) { /* Get it from the network label */ r = mac_selinux_get_our_label(&label); if (r < 0 && r != -EOPNOTSUPP) goto rollback; } else { /* Get it from the executable we are about to start */ r = socket_instantiate_service(s); if (r < 0) goto rollback; if (UNIT_ISSET(s->service) && SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]) { r = mac_selinux_get_create_label_from_exe(SERVICE(UNIT_DEREF(s->service))->exec_command[SERVICE_EXEC_START]->path, &label); if (r < 0 && r != -EPERM && r != -EOPNOTSUPP) goto rollback; } } know_label = true; } /* Apply the socket protocol */ switch(p->address.type) { case SOCK_STREAM: case SOCK_SEQPACKET: if (p->socket->socket_protocol == IPPROTO_SCTP) p->address.protocol = p->socket->socket_protocol; break; case SOCK_DGRAM: if (p->socket->socket_protocol == IPPROTO_UDPLITE) p->address.protocol = p->socket->socket_protocol; break; } r = socket_address_listen( &p->address, SOCK_CLOEXEC|SOCK_NONBLOCK, s->backlog, s->bind_ipv6_only, s->bind_to_device, s->reuse_port, s->free_bind, s->transparent, s->directory_mode, s->socket_mode, label); if (r < 0) goto rollback; p->fd = r; socket_apply_socket_options(s, p->fd); socket_symlink(s); break; case SOCKET_SPECIAL: p->fd = special_address_create(p->path, s->writable); if (p->fd < 0) { r = p->fd; goto rollback; } break; case SOCKET_FIFO: p->fd = fifo_address_create( p->path, s->directory_mode, s->socket_mode); if (p->fd < 0) { r = p->fd; goto rollback; } socket_apply_fifo_options(s, p->fd); socket_symlink(s); break; case SOCKET_MQUEUE: p->fd = mq_address_create( p->path, s->socket_mode, s->mq_maxmsg, s->mq_msgsize); if (p->fd < 0) { r = p->fd; goto rollback; } break; case SOCKET_USB_FUNCTION: p->fd = usbffs_address_create(p->path); if (p->fd < 0) { r = p->fd; goto rollback; } r = usbffs_write_descs(p->fd, SERVICE(UNIT_DEREF(s->service))); if (r < 0) goto rollback; r = usbffs_dispatch_eps(p); if (r < 0) goto rollback; break; default: assert_not_reached("Unknown port type"); } } return 0; rollback: socket_close_fds(s); return r; } static void socket_unwatch_fds(Socket *s) { SocketPort *p; int r; assert(s); LIST_FOREACH(port, p, s->ports) { if (p->fd < 0) continue; if (!p->event_source) continue; r = sd_event_source_set_enabled(p->event_source, SD_EVENT_OFF); if (r < 0) log_unit_debug_errno(UNIT(s), r, "Failed to disable event source: %m"); } } static int socket_watch_fds(Socket *s) { SocketPort *p; int r; assert(s); LIST_FOREACH(port, p, s->ports) { if (p->fd < 0) continue; if (p->event_source) { r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON); if (r < 0) goto fail; } else { r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p); if (r < 0) goto fail; (void) sd_event_source_set_description(p->event_source, "socket-port-io"); } } return 0; fail: log_unit_warning_errno(UNIT(s), r, "Failed to watch listening fds: %m"); 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 (!IN_SET(state, SOCKET_START_PRE, SOCKET_START_CHOWN, SOCKET_START_POST, SOCKET_STOP_PRE, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL, SOCKET_STOP_POST, SOCKET_FINAL_SIGTERM, SOCKET_FINAL_SIGKILL)) { s->timer_event_source = sd_event_source_unref(s->timer_event_source); 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 (!IN_SET(state, SOCKET_START_CHOWN, SOCKET_START_POST, SOCKET_LISTENING, SOCKET_RUNNING, SOCKET_STOP_PRE, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL)) socket_close_fds(s); if (state != old_state) log_unit_debug(UNIT(s), "Changed %s -> %s", 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) return 0; if (s->control_pid > 0 && pid_is_unwaited(s->control_pid) && IN_SET(s->deserialized_state, SOCKET_START_PRE, SOCKET_START_CHOWN, SOCKET_START_POST, SOCKET_STOP_PRE, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL, SOCKET_STOP_POST, SOCKET_FINAL_SIGTERM, SOCKET_FINAL_SIGKILL)) { r = unit_watch_pid(UNIT(s), s->control_pid); if (r < 0) return r; r = socket_arm_timer(s); if (r < 0) return r; } if (IN_SET(s->deserialized_state, SOCKET_START_CHOWN, SOCKET_START_POST, SOCKET_LISTENING, SOCKET_RUNNING, SOCKET_STOP_PRE, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL)) { r = socket_open_fds(s); if (r < 0) return r; } if (s->deserialized_state == SOCKET_LISTENING) { r = socket_watch_fds(s); if (r < 0) return r; } socket_set_state(s, s->deserialized_state); return 0; } static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) { _cleanup_free_ char **argv = NULL; pid_t pid; int r; ExecParameters exec_params = { .apply_permissions = true, .apply_chroot = true, .apply_tty_stdin = true, .bus_endpoint_fd = -1, .stdin_fd = -1, .stdout_fd = -1, .stderr_fd = -1, }; assert(s); assert(c); assert(_pid); (void) unit_realize_cgroup(UNIT(s)); if (s->reset_cpu_usage) { (void) unit_reset_cpu_usage(UNIT(s)); s->reset_cpu_usage = false; } r = unit_setup_exec_runtime(UNIT(s)); if (r < 0) goto fail; r = socket_arm_timer(s); if (r < 0) goto fail; r = unit_full_printf_strv(UNIT(s), c->argv, &argv); if (r < 0) goto fail; exec_params.argv = argv; exec_params.environment = UNIT(s)->manager->environment; exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; exec_params.cgroup_path = UNIT(s)->cgroup_path; exec_params.cgroup_delegate = s->cgroup_context.delegate; exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); r = exec_spawn(UNIT(s), c, &s->exec_context, &exec_params, s->exec_runtime, &pid); if (r < 0) goto fail; r = unit_watch_pid(UNIT(s), pid); if (r < 0) /* FIXME: we need to do something here */ goto fail; *_pid = pid; return 0; fail: s->timer_event_source = sd_event_source_unref(s->timer_event_source); return r; } static int socket_chown(Socket *s, pid_t *_pid) { pid_t pid; int r; r = socket_arm_timer(s); if (r < 0) goto fail; /* We have to resolve the user names out-of-process, hence * let's fork here. It's messy, but well, what can we do? */ pid = fork(); if (pid < 0) return -errno; if (pid == 0) { SocketPort *p; uid_t uid = UID_INVALID; gid_t gid = GID_INVALID; int ret; (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); (void) ignore_signals(SIGPIPE, -1); log_forget_fds(); if (!isempty(s->user)) { const char *user = s->user; r = get_user_creds(&user, &uid, &gid, NULL, NULL); if (r < 0) { ret = EXIT_USER; goto fail_child; } } if (!isempty(s->group)) { const char *group = s->group; r = get_group_creds(&group, &gid); if (r < 0) { ret = EXIT_GROUP; goto fail_child; } } LIST_FOREACH(port, p, s->ports) { const char *path = NULL; if (p->type == SOCKET_SOCKET) path = socket_address_get_path(&p->address); else if (p->type == SOCKET_FIFO) path = p->path; if (!path) continue; if (chown(path, uid, gid) < 0) { r = -errno; ret = EXIT_CHOWN; goto fail_child; } } _exit(0); fail_child: log_open(); log_error_errno(r, "Failed to chown socket at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); _exit(ret); } r = unit_watch_pid(UNIT(s), pid); if (r < 0) goto fail; *_pid = pid; return 0; fail: s->timer_event_source = sd_event_source_unref(s->timer_event_source); return r; } static void socket_enter_dead(Socket *s, SocketResult f) { assert(s); if (f != SOCKET_SUCCESS) s->result = f; exec_runtime_destroy(s->exec_runtime); s->exec_runtime = exec_runtime_unref(s->exec_runtime); exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); 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; s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]; if (s->control_command) { r = socket_spawn(s, s->control_command, &s->control_pid); if (r < 0) goto fail; socket_set_state(s, SOCKET_STOP_POST); } else socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m"); socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_RESOURCES); } static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) { int r; assert(s); if (f != SOCKET_SUCCESS) s->result = f; r = unit_kill_context( UNIT(s), &s->kill_context, (state != SOCKET_STOP_PRE_SIGTERM && state != SOCKET_FINAL_SIGTERM) ? KILL_KILL : KILL_TERMINATE, -1, s->control_pid, false); if (r < 0) goto fail; if (r > 0) { r = socket_arm_timer(s); if (r < 0) goto fail; socket_set_state(s, state); } else if (state == SOCKET_STOP_PRE_SIGTERM) socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS); else if (state == SOCKET_STOP_PRE_SIGKILL) socket_enter_stop_post(s, SOCKET_SUCCESS); else if (state == SOCKET_FINAL_SIGTERM) socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS); else socket_enter_dead(s, SOCKET_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); 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); } 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; s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]; if (s->control_command) { r = socket_spawn(s, s->control_command, &s->control_pid); if (r < 0) goto fail; socket_set_state(s, SOCKET_STOP_PRE); } else socket_enter_stop_post(s, SOCKET_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-pre' task: %m"); 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_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m"); 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); socket_unwatch_control_pid(s); s->control_command_id = SOCKET_EXEC_START_POST; s->control_command = s->exec_command[SOCKET_EXEC_START_POST]; if (s->control_command) { r = socket_spawn(s, s->control_command, &s->control_pid); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m"); 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_chown(Socket *s) { int r; assert(s); r = socket_open_fds(s); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m"); goto fail; } if (!isempty(s->user) || !isempty(s->group)) { socket_unwatch_control_pid(s); s->control_command_id = SOCKET_EXEC_START_CHOWN; s->control_command = NULL; r = socket_chown(s, &s->control_pid); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to fork 'start-chown' task: %m"); goto fail; } socket_set_state(s, SOCKET_START_CHOWN); } else socket_enter_start_post(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; s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]; if (s->control_command) { r = socket_spawn(s, s->control_command, &s->control_pid); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m"); goto fail; } socket_set_state(s, SOCKET_START_PRE); } else socket_enter_start_chown(s); return; fail: socket_enter_dead(s, SOCKET_FAILURE_RESOURCES); } static void socket_enter_running(Socket *s, int cfd) { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(s); /* We don't take connections anymore if we are supposed to * shut down anyway */ if (unit_stop_pending(UNIT(s))) { log_unit_debug(UNIT(s), "Suppressing connection request since unit stop is scheduled."); if (cfd >= 0) safe_close(cfd); else { /* Flush all sockets by closing and reopening them */ socket_close_fds(s); r = socket_open_fds(s); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to listen on sockets: %m"); socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES); return; } r = socket_watch_fds(s); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to watch sockets: %m"); socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES); } } return; } if (cfd < 0) { Iterator i; Unit *other; bool pending = false; /* If there's already a start pending don't bother to * do anything */ SET_FOREACH(other, UNIT(s)->dependencies[UNIT_TRIGGERS], i) if (unit_active_or_pending(other)) { pending = true; break; } if (!pending) { if (!UNIT_ISSET(s->service)) { log_unit_error(UNIT(s), "Service to activate vanished, refusing activation."); r = -ENOENT; goto fail; } r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT_DEREF(s->service), JOB_REPLACE, &error, NULL); if (r < 0) goto fail; } socket_set_state(s, SOCKET_RUNNING); } else { _cleanup_free_ char *prefix = NULL, *instance = NULL, *name = NULL; Service *service; if (s->n_connections >= s->max_connections) { log_unit_warning(UNIT(s), "Too many incoming connections (%u)", s->n_connections); safe_close(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. */ safe_close(cfd); return; } r = unit_name_to_prefix(UNIT(s)->id, &prefix); if (r < 0) goto fail; r = unit_name_build(prefix, instance, ".service", &name); if (r < 0) goto fail; r = unit_add_name(UNIT_DEREF(s->service), name); if (r < 0) 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); r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net); if (r < 0) goto fail; cfd = -1; s->n_connections ++; r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL); if (r < 0) goto fail; /* Notify clients about changed counters */ unit_add_to_dbus_queue(UNIT(s)); } return; fail: log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s", cfd >= 0 ? "template" : "non-template", bus_error_message(&error, r)); socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES); safe_close(cfd); } 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; r = socket_spawn(s, s->control_command, &s->control_pid); if (r < 0) goto fail; return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run next task: %m"); 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 (IN_SET(s->state, SOCKET_STOP_PRE, SOCKET_STOP_PRE_SIGKILL, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_POST, SOCKET_FINAL_SIGTERM, SOCKET_FINAL_SIGKILL)) return -EAGAIN; /* Already on it! */ if (IN_SET(s->state, SOCKET_START_PRE, SOCKET_START_CHOWN, SOCKET_START_POST)) return 0; /* Cannot run this without the service being around */ if (UNIT_ISSET(s->service)) { Service *service; service = SERVICE(UNIT_DEREF(s->service)); if (UNIT(service)->load_state != UNIT_LOADED) { log_unit_error(u, "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_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id); return -EBUSY; } } assert(s->state == SOCKET_DEAD || s->state == SOCKET_FAILED); s->result = SOCKET_SUCCESS; s->reset_cpu_usage = true; socket_enter_start_pre(s); return 1; } static int socket_stop(Unit *u) { Socket *s = SOCKET(u); assert(s); /* Already on it */ if (IN_SET(s->state, SOCKET_STOP_PRE, SOCKET_STOP_PRE_SIGTERM, SOCKET_STOP_PRE_SIGKILL, SOCKET_STOP_POST, SOCKET_FINAL_SIGTERM, SOCKET_FINAL_SIGKILL)) return 0; /* If there's already something running we go directly into * kill mode. */ if (IN_SET(s->state, SOCKET_START_PRE, SOCKET_START_CHOWN, 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 1; } 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", PID_FMT, 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; copy = fdset_put_dup(fds, p->fd); if (copy < 0) return copy; if (p->type == SOCKET_SOCKET) { _cleanup_free_ char *t = NULL; r = socket_address_print(&p->address, &t); if (r < 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); } 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 if (p->type == SOCKET_USB_FUNCTION) unit_serialize_item_format(u, f, "ffs", "%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); if (streq(key, "state")) { SocketState state; state = socket_state_from_string(value); if (state < 0) log_unit_debug(u, "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_unit_debug(u, "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_unit_debug(u, "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_unit_debug(u, "Failed to parse control-pid value: %s", value); else s->control_pid = pid; } else if (streq(key, "control-command")) { SocketExecCommand id; id = socket_exec_command_from_string(value); if (id < 0) log_unit_debug(u, "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_unit_debug(u, "Failed to parse fifo value: %s", value); else { LIST_FOREACH(port, p, s->ports) if (p->type == SOCKET_FIFO && path_equal_or_files_same(p->path, value+skip)) break; if (p) { safe_close(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_unit_debug(u, "Failed to parse special value: %s", value); else { LIST_FOREACH(port, p, s->ports) if (p->type == SOCKET_SPECIAL && path_equal_or_files_same(p->path, value+skip)) break; if (p) { safe_close(p->fd); p->fd = fdset_remove(fds, fd); } } } 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_unit_debug(u, "Failed to parse mqueue value: %s", value); else { LIST_FOREACH(port, p, s->ports) if (p->type == SOCKET_MQUEUE && streq(p->path, value+skip)) break; if (p) { safe_close(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_unit_debug(u, "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) { safe_close(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_unit_debug(u, "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) { safe_close(p->fd); p->fd = fdset_remove(fds, fd); } } } else if (streq(key, "ffs")) { int fd, skip = 0; SocketPort *p; if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse ffs value: %s", value); else { LIST_FOREACH(port, p, s->ports) if (p->type == SOCKET_USB_FUNCTION && path_equal_or_files_same(p->path, value+skip)) break; if (p) { safe_close(p->fd); p->fd = fdset_remove(fds, fd); } } } else log_unit_debug(UNIT(s), "Unknown serialization key: %s", key); return 0; } static void 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; } } } } _pure_ static UnitActiveState socket_active_state(Unit *u) { assert(u); return state_translation_table[SOCKET(u)->state]; } _pure_ static const char *socket_sub_state_to_string(Unit *u) { assert(u); return socket_state_to_string(SOCKET(u)->state); } const char* socket_port_type_to_string(SocketPort *p) { assert(p); switch (p->type) { case SOCKET_SOCKET: switch (p->address.type) { case SOCK_STREAM: return "Stream"; case SOCK_DGRAM: return "Datagram"; case SOCK_SEQPACKET: return "SequentialPacket"; case SOCK_RAW: if (socket_address_family(&p->address) == AF_NETLINK) return "Netlink"; default: return NULL; } case SOCKET_SPECIAL: return "Special"; case SOCKET_MQUEUE: return "MessageQueue"; case SOCKET_FIFO: return "FIFO"; case SOCKET_USB_FUNCTION: return "USBFunction"; default: return NULL; } } _pure_ static bool socket_check_gc(Unit *u) { Socket *s = SOCKET(u); assert(u); return s->n_connections > 0; } static int socket_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { SocketPort *p = userdata; int cfd = -1; assert(p); assert(fd >= 0); if (p->socket->state != SOCKET_LISTENING) return 0; log_unit_debug(UNIT(p->socket), "Incoming traffic"); if (revents != EPOLLIN) { if (revents & EPOLLHUP) log_unit_error(UNIT(p->socket), "Got POLLHUP on a listening socket. The service probably invoked shutdown() on it, and should better not do that."); else log_unit_error(UNIT(p->socket), "Got unexpected poll event (0x%x) on socket.", revents); goto fail; } if (p->socket->accept && p->type == SOCKET_SOCKET && socket_address_can_accept(&p->address)) { for (;;) { cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK); if (cfd < 0) { if (errno == EINTR) continue; log_unit_error_errno(UNIT(p->socket), errno, "Failed to accept socket: %m"); goto fail; } break; } socket_apply_socket_options(p->socket, cfd); } socket_enter_running(p->socket, cfd); return 0; fail: socket_enter_stop_pre(p->socket, SOCKET_FAILURE_RESOURCES); return 0; } 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, NULL)) 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 sigchld 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_unit_full(u, f == SOCKET_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, "Control process exited, code=%s status=%i", 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_unit_debug(u, "Running next command for state %s", 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_unit_debug(u, "Got final SIGCHLD for state %s", socket_state_to_string(s->state)); switch (s->state) { case SOCKET_START_PRE: if (f == SOCKET_SUCCESS) socket_enter_start_chown(s); else socket_enter_signal(s, SOCKET_FINAL_SIGTERM, f); break; case SOCKET_START_CHOWN: if (f == SOCKET_SUCCESS) socket_enter_start_post(s); else socket_enter_stop_pre(s, 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 int socket_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { Socket *s = SOCKET(userdata); assert(s); assert(s->timer_event_source == source); switch (s->state) { case SOCKET_START_PRE: log_unit_warning(UNIT(s), "Starting timed out. Terminating."); socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT); break; case SOCKET_START_CHOWN: case SOCKET_START_POST: log_unit_warning(UNIT(s), "Starting timed out. Stopping."); socket_enter_stop_pre(s, SOCKET_FAILURE_TIMEOUT); break; case SOCKET_STOP_PRE: log_unit_warning(UNIT(s), "Stopping timed out. Terminating."); socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, SOCKET_FAILURE_TIMEOUT); break; case SOCKET_STOP_PRE_SIGTERM: if (s->kill_context.send_sigkill) { log_unit_warning(UNIT(s), "Stopping timed out. Killing."); socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_FAILURE_TIMEOUT); } else { log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL. Ignoring."); socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT); } break; case SOCKET_STOP_PRE_SIGKILL: log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring."); socket_enter_stop_post(s, SOCKET_FAILURE_TIMEOUT); break; case SOCKET_STOP_POST: log_unit_warning(UNIT(s), "Stopping timed out (2). Terminating."); socket_enter_signal(s, SOCKET_FINAL_SIGTERM, SOCKET_FAILURE_TIMEOUT); break; case SOCKET_FINAL_SIGTERM: if (s->kill_context.send_sigkill) { log_unit_warning(UNIT(s), "Stopping timed out (2). Killing."); socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_FAILURE_TIMEOUT); } else { log_unit_warning(UNIT(s), "Stopping timed out (2). Skipping SIGKILL. Ignoring."); socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT); } break; case SOCKET_FINAL_SIGKILL: log_unit_warning(UNIT(s), "Still around after SIGKILL (2). Entering failed mode."); socket_enter_dead(s, SOCKET_FAILURE_TIMEOUT); break; default: assert_not_reached("Timeout at wrong time."); } return 0; } int socket_collect_fds(Socket *s, int **fds) { int *rfds, k = 0, n = 0; SocketPort *p; assert(s); assert(fds); /* Called from the service code for requesting our fds */ LIST_FOREACH(port, p, s->ports) { if (p->fd >= 0) n++; n += p->n_auxiliary_fds; } if (n <= 0) { *fds = NULL; return 0; } rfds = new(int, n); if (!rfds) return -ENOMEM; LIST_FOREACH(port, p, s->ports) { int i; if (p->fd >= 0) rfds[k++] = p->fd; for (i = 0; i < p->n_auxiliary_fds; ++i) rfds[k++] = p->auxiliary_fds[i]; } assert(k == n); *fds = rfds; return n; } 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 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_unit_debug(UNIT(s), "Got notified about service death (failed permanently: %s)", 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_unit_debug(UNIT(s), "One connection closed, %u left.", s->n_connections); } static void socket_trigger_notify(Unit *u, Unit *other) { Socket *s = SOCKET(u); Service *se; assert(u); assert(other); /* Don't propagate state changes from the service if we are already down or accepting connections */ if ((s->state != SOCKET_RUNNING && s->state != SOCKET_LISTENING) || s->accept) return; if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) return; se = SERVICE(other); if (se->state == SERVICE_FAILED) socket_notify_service_dead(s, se->result == SERVICE_FAILURE_START_LIMIT); if (se->state == SERVICE_DEAD || se->state == SERVICE_FINAL_SIGTERM || se->state == SERVICE_FINAL_SIGKILL || se->state == SERVICE_AUTO_RESTART) socket_notify_service_dead(s, false); if (se->state == SERVICE_RUNNING) socket_set_state(s, SOCKET_RUNNING); } static int socket_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { return unit_kill_common(u, who, signo, -1, SOCKET(u)->control_pid, error); } static int socket_get_timeout(Unit *u, uint64_t *timeout) { Socket *s = SOCKET(u); int r; if (!s->timer_event_source) return 0; r = sd_event_source_get_time(s->timer_event_source, timeout); if (r < 0) return r; return 1; } char *socket_fdname(Socket *s) { assert(s); /* Returns the name to use for $LISTEN_NAMES. If the user * didn't specify anything specifically, use the socket unit's * name as fallback. */ if (s->fdname) return s->fdname; return UNIT(s)->id; } static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = { [SOCKET_EXEC_START_PRE] = "StartPre", [SOCKET_EXEC_START_CHOWN] = "StartChown", [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 = { .object_size = sizeof(Socket), .exec_context_offset = offsetof(Socket, exec_context), .cgroup_context_offset = offsetof(Socket, cgroup_context), .kill_context_offset = offsetof(Socket, kill_context), .exec_runtime_offset = offsetof(Socket, exec_runtime), .sections = "Unit\0" "Socket\0" "Install\0", .private_section = "Socket", .init = socket_init, .done = socket_done, .load = socket_load, .coldplug = socket_coldplug, .dump = socket_dump, .start = socket_start, .stop = socket_stop, .kill = socket_kill, .get_timeout = socket_get_timeout, .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, .check_gc = socket_check_gc, .sigchld_event = socket_sigchld_event, .trigger_notify = socket_trigger_notify, .reset_failed = socket_reset_failed, .bus_vtable = bus_socket_vtable, .bus_set_property = bus_socket_set_property, .bus_commit_properties = bus_socket_commit_properties, .status_message_formats = { /*.starting_stopping = { [0] = "Starting socket %s...", [1] = "Stopping socket %s...", },*/ .finished_start_job = { [JOB_DONE] = "Listening on %s.", [JOB_FAILED] = "Failed to listen on %s.", [JOB_TIMEOUT] = "Timed out starting %s.", }, .finished_stop_job = { [JOB_DONE] = "Closed %s.", [JOB_FAILED] = "Failed stopping %s.", [JOB_TIMEOUT] = "Timed out stopping %s.", }, }, };