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Systemd/src/machine/machine.c
Lennart Poettering 40e1f4ea74 machined: when opening a shell via machined, pass tty fds in 
With this change we'll open the shell's tty right from machined and then
pass it to the transient unit we create. This way we make sure the pty
is opened exactly as long as the transient service is around, and no
longer, and vice versa. This way pty forwarders do not have to deal with
EIO problems due to vhangup, as the pty is open all the time from the
point we set things up to the point where the service goes away.
2015-10-08 15:03:31 +02:00

648 lines
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/*-*- 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 <errno.h>
#include <string.h>
#include <unistd.h>
#include "sd-messages.h"
#include "bus-error.h"
#include "bus-util.h"
#include "fileio.h"
#include "formats-util.h"
#include "hashmap.h"
#include "mkdir.h"
#include "special.h"
#include "terminal-util.h"
#include "unit-name.h"
#include "util.h"
#include "machine-dbus.h"
#include "machine.h"
Machine* machine_new(Manager *manager, MachineClass class, const char *name) {
Machine *m;
assert(manager);
assert(class < _MACHINE_CLASS_MAX);
assert(name);
/* Passing class == _MACHINE_CLASS_INVALID here is fine. It
* means as much as "we don't know yet", and that we'll figure
* it out later when loading the state file. */
m = new0(Machine, 1);
if (!m)
return NULL;
m->name = strdup(name);
if (!m->name)
goto fail;
if (class != MACHINE_HOST) {
m->state_file = strappend("/run/systemd/machines/", m->name);
if (!m->state_file)
goto fail;
}
m->class = class;
if (hashmap_put(manager->machines, m->name, m) < 0)
goto fail;
m->manager = manager;
return m;
fail:
free(m->state_file);
free(m->name);
free(m);
return NULL;
}
void machine_free(Machine *m) {
assert(m);
while (m->operations)
machine_operation_unref(m->operations);
if (m->in_gc_queue)
LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
machine_release_unit(m);
free(m->scope_job);
(void) hashmap_remove(m->manager->machines, m->name);
if (m->manager->host_machine == m)
m->manager->host_machine = NULL;
if (m->leader > 0)
(void) 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);
if (!m->state_file)
return 0;
if (!m->started)
return 0;
r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0);
if (r < 0)
goto fail;
r = fopen_temporary(m->state_file, &f, &temp_path);
if (r < 0)
goto fail;
(void) 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 fail;
}
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 fail;
}
fprintf(f, "SERVICE=%s\n", escaped);
}
if (m->root_directory) {
_cleanup_free_ char *escaped;
escaped = cescape(m->root_directory);
if (!escaped) {
r = -ENOMEM;
goto fail;
}
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 fail;
if (rename(temp_path, m->state_file) < 0) {
r = -errno;
goto fail;
}
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. Ignore error. */
sl = strjoina("/run/systemd/machines/unit:", m->unit);
(void) symlink(m->name, sl);
}
return 0;
fail:
(void) unlink(m->state_file);
if (temp_path)
(void) unlink(temp_path);
return log_error_errno(r, "Failed to save machine data %s: %m", m->state_file);
}
static void machine_unlink(Machine *m) {
assert(m);
if (m->unit) {
char *sl;
sl = strjoina("/run/systemd/machines/unit:", m->unit);
(void) unlink(sl);
}
if (m->state_file)
(void) 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);
if (!m->state_file)
return 0;
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;
return log_error_errno(r, "Failed to read %s: %m", m->state_file);
}
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);
assert(m->class != MACHINE_HOST);
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 = strjoina(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 (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
return -EOPNOTSUPP;
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,
LOG_MESSAGE_ID(SD_MESSAGE_MACHINE_START),
"NAME=%s", m->name,
"LEADER="PID_FMT, m->leader,
LOG_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);
assert(m->class != MACHINE_HOST);
if (!m->unit)
return 0;
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;
assert(m);
if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
return -EOPNOTSUPP;
r = machine_stop_scope(m);
m->stopping = true;
machine_save(m);
return r;
}
int machine_finalize(Machine *m) {
assert(m);
if (m->started)
log_struct(LOG_INFO,
LOG_MESSAGE_ID(SD_MESSAGE_MACHINE_STOP),
"NAME=%s", m->name,
"LEADER="PID_FMT, m->leader,
LOG_MESSAGE("Machine %s terminated.", m->name),
NULL);
machine_unlink(m);
machine_add_to_gc_queue(m);
if (m->started) {
machine_send_signal(m, false);
m->started = false;
}
return 0;
}
bool machine_check_gc(Machine *m, bool drop_not_started) {
assert(m);
if (m->class == MACHINE_HOST)
return true;
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->class == MACHINE_HOST)
return MACHINE_RUNNING;
if (s->stopping)
return MACHINE_CLOSING;
if (s->scope_job)
return MACHINE_OPENING;
return MACHINE_RUNNING;
}
int machine_kill(Machine *m, KillWho who, int signo) {
assert(m);
if (!IN_SET(m->class, MACHINE_VM, MACHINE_CONTAINER))
return -EOPNOTSUPP;
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);
}
int machine_openpt(Machine *m, int flags) {
assert(m);
switch (m->class) {
case MACHINE_HOST: {
int fd;
fd = posix_openpt(flags);
if (fd < 0)
return -errno;
if (unlockpt(fd) < 0)
return -errno;
return fd;
}
case MACHINE_CONTAINER:
if (m->leader <= 0)
return -EINVAL;
return openpt_in_namespace(m->leader, flags);
default:
return -EOPNOTSUPP;
}
}
int machine_open_terminal(Machine *m, const char *path, int mode) {
assert(m);
switch (m->class) {
case MACHINE_HOST:
return open_terminal(path, mode);
case MACHINE_CONTAINER:
if (m->leader <= 0)
return -EINVAL;
return open_terminal_in_namespace(m->leader, path, mode);
default:
return -EOPNOTSUPP;
}
}
MachineOperation *machine_operation_unref(MachineOperation *o) {
if (!o)
return NULL;
sd_event_source_unref(o->event_source);
safe_close(o->errno_fd);
if (o->pid > 1)
(void) kill(o->pid, SIGKILL);
sd_bus_message_unref(o->message);
if (o->machine) {
LIST_REMOVE(operations, o->machine->operations, o);
o->machine->n_operations--;
}
free(o);
return NULL;
}
void machine_release_unit(Machine *m) {
assert(m);
if (!m->unit)
return;
(void) hashmap_remove(m->manager->machine_units, m->unit);
m->unit = mfree(m->unit);
}
static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
[MACHINE_CONTAINER] = "container",
[MACHINE_VM] = "vm",
[MACHINE_HOST] = "host",
};
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);
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