/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2011 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 <http://www.gnu.org/licenses/>. ***/ #include <string.h> #include <unistd.h> #include <errno.h> #include "sd-messages.h" #include "util.h" #include "mkdir.h" #include "hashmap.h" #include "strv.h" #include "fileio.h" #include "special.h" #include "unit-name.h" #include "machine.h" #include "bus-util.h" #include "bus-error.h" Machine* machine_new(Manager *manager, const char *name) { Machine *m; assert(manager); assert(name); m = new0(Machine, 1); if (!m) return NULL; m->name = strdup(name); if (!m->name) goto fail; m->state_file = strappend("/run/systemd/machines/", m->name); if (!m->state_file) goto fail; if (hashmap_put(manager->machines, m->name, m) < 0) goto fail; m->class = _MACHINE_CLASS_INVALID; m->manager = manager; return m; fail: free(m->state_file); free(m->name); free(m); return NULL; } void machine_free(Machine *m) { assert(m); if (m->in_gc_queue) LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m); if (m->unit) { hashmap_remove(m->manager->machine_units, m->unit); free(m->unit); } free(m->scope_job); hashmap_remove(m->manager->machines, m->name); if (m->leader > 0) hashmap_remove_value(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m); sd_bus_message_unref(m->create_message); free(m->name); free(m->state_file); free(m->service); free(m->root_directory); free(m->netif); free(m); } int machine_save(Machine *m) { _cleanup_free_ char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; int r; assert(m); assert(m->state_file); if (!m->started) return 0; r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0); if (r < 0) goto finish; r = fopen_temporary(m->state_file, &f, &temp_path); if (r < 0) goto finish; fchmod(fileno(f), 0644); fprintf(f, "# This is private data. Do not parse.\n" "NAME=%s\n", m->name); if (m->unit) { _cleanup_free_ char *escaped; escaped = cescape(m->unit); if (!escaped) { r = -ENOMEM; goto finish; } fprintf(f, "SCOPE=%s\n", escaped); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */ } if (m->scope_job) fprintf(f, "SCOPE_JOB=%s\n", m->scope_job); if (m->service) { _cleanup_free_ char *escaped; escaped = cescape(m->service); if (!escaped) { r = -ENOMEM; goto finish; } fprintf(f, "SERVICE=%s\n", escaped); } if (m->root_directory) { _cleanup_free_ char *escaped; escaped = cescape(m->root_directory); if (!escaped) { r = -ENOMEM; goto finish; } fprintf(f, "ROOT=%s\n", escaped); } if (!sd_id128_equal(m->id, SD_ID128_NULL)) fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id)); if (m->leader != 0) fprintf(f, "LEADER="PID_FMT"\n", m->leader); if (m->class != _MACHINE_CLASS_INVALID) fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class)); if (dual_timestamp_is_set(&m->timestamp)) fprintf(f, "REALTIME="USEC_FMT"\n" "MONOTONIC="USEC_FMT"\n", m->timestamp.realtime, m->timestamp.monotonic); if (m->n_netif > 0) { unsigned i; fputs("NETIF=", f); for (i = 0; i < m->n_netif; i++) { if (i != 0) fputc(' ', f); fprintf(f, "%i", m->netif[i]); } fputc('\n', f); } r = fflush_and_check(f); if (r < 0) goto finish; if (rename(temp_path, m->state_file) < 0) { r = -errno; goto finish; } if (m->unit) { char *sl; /* Create a symlink from the unit name to the machine * name, so that we can quickly find the machine for * each given unit */ sl = strappenda("/run/systemd/machines/unit:", m->unit); symlink(m->name, sl); } finish: if (r < 0) { if (temp_path) unlink(temp_path); log_error("Failed to save machine data %s: %s", m->state_file, strerror(-r)); } return r; } static void machine_unlink(Machine *m) { assert(m); if (m->unit) { char *sl; sl = strappenda("/run/systemd/machines/unit:", m->unit); unlink(sl); } if (m->state_file) unlink(m->state_file); } int machine_load(Machine *m) { _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL, *netif = NULL; int r; assert(m); r = parse_env_file(m->state_file, NEWLINE, "SCOPE", &m->unit, "SCOPE_JOB", &m->scope_job, "SERVICE", &m->service, "ROOT", &m->root_directory, "ID", &id, "LEADER", &leader, "CLASS", &class, "REALTIME", &realtime, "MONOTONIC", &monotonic, "NETIF", &netif, NULL); if (r < 0) { if (r == -ENOENT) return 0; log_error("Failed to read %s: %s", m->state_file, strerror(-r)); return r; } if (id) sd_id128_from_string(id, &m->id); if (leader) parse_pid(leader, &m->leader); if (class) { MachineClass c; c = machine_class_from_string(class); if (c >= 0) m->class = c; } if (realtime) { unsigned long long l; if (sscanf(realtime, "%llu", &l) > 0) m->timestamp.realtime = l; } if (monotonic) { unsigned long long l; if (sscanf(monotonic, "%llu", &l) > 0) m->timestamp.monotonic = l; } if (netif) { size_t l, allocated = 0, nr = 0; const char *word, *state; int *ni = NULL; FOREACH_WORD(word, l, netif, state) { char buf[l+1]; int ifi; *(char*) (mempcpy(buf, word, l)) = 0; if (safe_atoi(buf, &ifi) < 0) continue; if (ifi <= 0) continue; if (!GREEDY_REALLOC(ni, allocated, nr+1)) { free(ni); return log_oom(); } ni[nr++] = ifi; } free(m->netif); m->netif = ni; m->n_netif = nr; } return r; } static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_error *error) { int r = 0; assert(m); if (!m->unit) { _cleanup_free_ char *escaped = NULL; char *scope, *description, *job = NULL; escaped = unit_name_escape(m->name); if (!escaped) return log_oom(); scope = strjoin("machine-", escaped, ".scope", NULL); if (!scope) return log_oom(); description = strappenda(m->class == MACHINE_VM ? "Virtual Machine " : "Container ", m->name); r = manager_start_scope(m->manager, scope, m->leader, SPECIAL_MACHINE_SLICE, description, properties, error, &job); if (r < 0) { log_error("Failed to start machine scope: %s", bus_error_message(error, r)); free(scope); return r; } else { m->unit = scope; free(m->scope_job); m->scope_job = job; } } if (m->unit) hashmap_put(m->manager->machine_units, m->unit, m); return r; } int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) { int r; assert(m); if (m->started) return 0; r = hashmap_put(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m); if (r < 0) return r; /* Create cgroup */ r = machine_start_scope(m, properties, error); if (r < 0) return r; log_struct(LOG_INFO, MESSAGE_ID(SD_MESSAGE_MACHINE_START), "NAME=%s", m->name, "LEADER="PID_FMT, m->leader, "MESSAGE=New machine %s.", m->name, NULL); if (!dual_timestamp_is_set(&m->timestamp)) dual_timestamp_get(&m->timestamp); m->started = true; /* Save new machine data */ machine_save(m); machine_send_signal(m, true); return 0; } static int machine_stop_scope(Machine *m) { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; char *job = NULL; int r; assert(m); if (!m->unit) return 0; if (!m->registered) { r = manager_stop_unit(m->manager, m->unit, &error, &job); if (r < 0) { log_error("Failed to stop machine scope: %s", bus_error_message(&error, r)); return r; } } free(m->scope_job); m->scope_job = job; return 0; } int machine_stop(Machine *m) { int r = 0, k; assert(m); if (m->started) log_struct(LOG_INFO, MESSAGE_ID(SD_MESSAGE_MACHINE_STOP), "NAME=%s", m->name, "LEADER="PID_FMT, m->leader, "MESSAGE=Machine %s terminated.", m->name, NULL); /* Kill cgroup */ k = machine_stop_scope(m); if (k < 0) r = k; machine_unlink(m); machine_add_to_gc_queue(m); if (m->started) machine_send_signal(m, false); m->started = false; return r; } bool machine_check_gc(Machine *m, bool drop_not_started) { assert(m); if (drop_not_started && !m->started) return false; if (m->scope_job && manager_job_is_active(m->manager, m->scope_job)) return true; if (m->unit && manager_unit_is_active(m->manager, m->unit)) return true; return false; } void machine_add_to_gc_queue(Machine *m) { assert(m); if (m->in_gc_queue) return; LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m); m->in_gc_queue = true; } MachineState machine_get_state(Machine *s) { assert(s); if (s->scope_job) return s->started ? MACHINE_OPENING : MACHINE_CLOSING; return MACHINE_RUNNING; } int machine_kill(Machine *m, KillWho who, int signo) { assert(m); if (!m->unit) return -ESRCH; if (who == KILL_LEADER) { /* If we shall simply kill the leader, do so directly */ if (kill(m->leader, signo) < 0) return -errno; return 0; } /* Otherwise make PID 1 do it for us, for the entire cgroup */ return manager_kill_unit(m->manager, m->unit, signo, NULL); } static const char* const machine_class_table[_MACHINE_CLASS_MAX] = { [MACHINE_CONTAINER] = "container", [MACHINE_VM] = "vm" }; DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass); static const char* const machine_state_table[_MACHINE_STATE_MAX] = { [MACHINE_OPENING] = "opening", [MACHINE_RUNNING] = "running", [MACHINE_CLOSING] = "closing" }; DEFINE_STRING_TABLE_LOOKUP(machine_state, MachineState); static const char* const kill_who_table[_KILL_WHO_MAX] = { [KILL_LEADER] = "leader", [KILL_ALL] = "all" }; DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);