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Systemd/src/core/socket.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <mqueue.h>
#include <netinet/tcp.h>
#include <signal.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/sctp.h>
#include "alloc-util.h"
#include "bpf-firewall.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 "format-util.h"
#include "fs-util.h"
#include "in-addr-util.h"
#include "io-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 "socket-protocol-list.h"
#include "special.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
#include "unit.h"
#include "user-util.h"
struct SocketPeer {
unsigned n_ref;
Socket *socket;
union sockaddr_union peer;
socklen_t peer_salen;
};
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;
s->trigger_limit.interval = USEC_INFINITY;
s->trigger_limit.burst = (unsigned) -1;
}
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);
SocketPeer *p;
assert(s);
socket_free_ports(s);
while ((p = set_steal_first(s->peers_by_address)))
p->socket = NULL;
s->peers_by_address = set_free(s->peers_by_address);
s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
s->control_command = NULL;
dynamic_creds_unref(&s->dynamic_creds);
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);
s->smack = mfree(s->smack);
s->smack_ip_in = mfree(s->smack_ip_in);
s->smack_ip_out = mfree(s->smack_ip_out);
strv_free(s->symlinks);
s->user = mfree(s->user);
s->group = mfree(s->group);
s->fdname = mfree(s->fdname);
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
}
static int socket_arm_timer(Socket *s, usec_t usec) {
int r;
assert(s);
if (s->timer_event_source) {
r = sd_event_source_set_time(s->timer_event_source, usec);
if (r < 0)
return r;
return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
}
if (usec == USEC_INFINITY)
return 0;
r = sd_event_add_time(
UNIT(s)->manager->event,
&s->timer_event_source,
CLOCK_MONOTONIC,
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;
unit_ref_set(&s->service, UNIT(s), u);
return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, u, false, UNIT_DEPENDENCY_IMPLICIT);
}
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_dependencies(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, UNIT_DEPENDENCY_FILE);
if (r < 0)
return r;
}
return 0;
}
static int socket_add_device_dependencies(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_dependency(UNIT(s), t, false, UNIT_BINDS_TO, UNIT_DEPENDENCY_FILE);
}
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, UNIT_DEPENDENCY_DEFAULT);
if (r < 0)
return r;
if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
if (r < 0)
return r;
}
return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
}
_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);
/* Pick defaults for the trigger limit, if nothing was explicitly configured. We pick a relatively high limit
* in Accept=yes mode, and a lower limit for Accept=no. Reason: in Accept=yes mode we are invoking accept()
* ourselves before the trigger limit can hit, thus incoming connections are taken off the socket queue quickly
* and reliably. This is different for Accept=no, where the spawned service has to take the incoming traffic
* off the queues, which it might not necessarily do. Moreover, while Accept=no services are supposed to
* process whatever is queued in one go, and thus should normally never have to be started frequently. This is
* different for Accept=yes where each connection is processed by a new service instance, and thus frequent
* service starts are typical. */
if (s->trigger_limit.interval == USEC_INFINITY)
s->trigger_limit.interval = 2 * USEC_PER_SEC;
if (s->trigger_limit.burst == (unsigned) -1) {
if (s->accept)
s->trigger_limit.burst = 200;
else
s->trigger_limit.burst = 20;
}
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, u, x);
}
r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(s->service), true, UNIT_DEPENDENCY_IMPLICIT);
if (r < 0)
return r;
}
r = socket_add_mount_dependencies(s);
if (r < 0)
return r;
r = socket_add_device_dependencies(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:
f = socket_address_get_path(&p->address);
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 has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.");
return -ENOEXEC;
}
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 -ENOEXEC;
}
if (s->accept && s->max_connections <= 0) {
log_unit_error(UNIT(s), "MaxConnection= setting too small. Refusing.");
return -ENOEXEC;
}
if (s->accept && UNIT_DEREF(s->service)) {
log_unit_error(UNIT(s), "Explicit service configuration for accepting socket units not supported. Refusing.");
return -ENOEXEC;
}
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 -ENOEXEC;
}
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 -ENOEXEC;
}
return 0;
}
static void peer_address_hash_func(const void *p, struct siphash *state) {
const SocketPeer *s = p;
assert(s);
if (s->peer.sa.sa_family == AF_INET)
siphash24_compress(&s->peer.in.sin_addr, sizeof(s->peer.in.sin_addr), state);
else if (s->peer.sa.sa_family == AF_INET6)
siphash24_compress(&s->peer.in6.sin6_addr, sizeof(s->peer.in6.sin6_addr), state);
else if (s->peer.sa.sa_family == AF_VSOCK)
siphash24_compress(&s->peer.vm.svm_cid, sizeof(s->peer.vm.svm_cid), state);
else
assert_not_reached("Unknown address family.");
}
static int peer_address_compare_func(const void *a, const void *b) {
const SocketPeer *x = a, *y = b;
int r;
r = CMP(x->peer.sa.sa_family, y->peer.sa.sa_family);
if (r != 0)
return r;
switch(x->peer.sa.sa_family) {
case AF_INET:
return memcmp(&x->peer.in.sin_addr, &y->peer.in.sin_addr, sizeof(x->peer.in.sin_addr));
case AF_INET6:
return memcmp(&x->peer.in6.sin6_addr, &y->peer.in6.sin6_addr, sizeof(x->peer.in6.sin6_addr));
case AF_VSOCK:
if (x->peer.vm.svm_cid < y->peer.vm.svm_cid)
return -1;
if (x->peer.vm.svm_cid > y->peer.vm.svm_cid)
return 1;
return 0;
}
assert_not_reached("Black sheep in the family!");
}
const struct hash_ops peer_address_hash_ops = {
.hash = peer_address_hash_func,
.compare = peer_address_compare_func
};
static int socket_load(Unit *u) {
Socket *s = SOCKET(u);
int r;
assert(u);
assert(u->load_state == UNIT_STUB);
r = set_ensure_allocated(&s->peers_by_address, &peer_address_hash_ops);
if (r < 0)
return r;
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);
}
static SocketPeer *socket_peer_new(void) {
SocketPeer *p;
p = new0(SocketPeer, 1);
if (!p)
return NULL;
p->n_ref = 1;
return p;
}
static SocketPeer *socket_peer_free(SocketPeer *p) {
assert(p);
if (p->socket)
set_remove(p->socket->peers_by_address, p);
return mfree(p);
}
DEFINE_TRIVIAL_REF_UNREF_FUNC(SocketPeer, socket_peer, socket_peer_free);
int socket_acquire_peer(Socket *s, int fd, SocketPeer **p) {
_cleanup_(socket_peer_unrefp) SocketPeer *remote = NULL;
SocketPeer sa = {}, *i;
socklen_t salen = sizeof(sa.peer);
int r;
assert(fd >= 0);
assert(s);
r = getpeername(fd, &sa.peer.sa, &salen);
if (r < 0)
return log_error_errno(errno, "getpeername failed: %m");
if (!IN_SET(sa.peer.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
*p = NULL;
return 0;
}
i = set_get(s->peers_by_address, &sa);
if (i) {
*p = socket_peer_ref(i);
return 1;
}
remote = socket_peer_new();
if (!remote)
return log_oom();
remote->peer = sa.peer;
remote->peer_salen = salen;
r = set_put(s->peers_by_address, remote);
if (r < 0)
return r;
remote->socket = s;
*p = TAKE_PTR(remote);
return 1;
}
_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, *str;
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"
"%sFileDescriptorName: %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"
"%sMaxConnectionsPerSource: %u\n",
prefix, s->n_accepted,
prefix, s->n_connections,
prefix, s->max_connections,
prefix, s->max_connections_per_source);
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,
"%sSocketUser: %s\n"
"%sSocketGroup: %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 > 0)
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 > 0)
fprintf(f,
"%sKeepAliveProbes: %u\n",
prefix, s->keep_alive_cnt);
if (s->defer_accept > 0)
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) {
switch (p->type) {
case SOCKET_SOCKET: {
_cleanup_free_ char *k = NULL;
const char *t;
int r;
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);
break;
}
case SOCKET_SPECIAL:
fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
break;
case SOCKET_USB_FUNCTION:
fprintf(f, "%sListenUSBFunction: %s\n", prefix, p->path);
break;
case SOCKET_MQUEUE:
fprintf(f, "%sListenMessageQueue: %s\n", prefix, p->path);
break;
default:
fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
}
}
fprintf(f,
"%sTriggerLimitIntervalSec: %s\n"
"%sTriggerLimitBurst: %u\n",
prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->trigger_limit.interval, USEC_PER_SEC),
prefix, s->trigger_limit.burst);
str = socket_protocol_to_name(s->socket_protocol);
if (str)
fprintf(f, "%sSocketProtocol: %s\n", prefix, str);
if (!strv_isempty(s->symlinks)) {
char **q;
fprintf(f, "%sSymlinks:", prefix);
STRV_FOREACH(q, s->symlinks)
fprintf(f, " %s", *q);
fprintf(f, "\n");
}
fprintf(f,
"%sTimeoutSec: %s\n",
prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, s->timeout_usec, USEC_PER_SEC));
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);
}
cgroup_context_dump(&s->cgroup_context, f, prefix);
}
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 = be32toh(local.in.sin_addr.s_addr),
b = be32toh(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,
be16toh(local.in.sin_port),
b >> 24, (b >> 16) & 0xFF, (b >> 8) & 0xFF, b & 0xFF,
be16toh(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],
be16toh(local.in6.sin6_port),
b[0], b[1], b[2], b[3],
be16toh(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)),
be16toh(local.in6.sin6_port),
inet_ntop(AF_INET6, &remote.in6.sin6_addr, b, sizeof(b)),
be16toh(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;
}
case AF_VSOCK:
if (asprintf(&r,
"%u-%u:%u-%u:%u",
nr,
local.vm.svm_cid, local.vm.svm_port,
remote.vm.svm_cid, remote.vm.svm_port) < 0)
return -ENOMEM;
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) {
bool was_open;
was_open = p->fd >= 0;
p->event_source = sd_event_source_unref(p->event_source);
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 normally delete sockets in the file system before we create a new one, not after we
* stopped using one! That all said, if the user explicitly requested this, we'll delete them here
* anyway, but only then. */
if (!was_open || !s->remove_on_stop)
continue;
switch (p->type) {
case SOCKET_FIFO:
(void) unlink(p->path);
break;
case SOCKET_MQUEUE:
(void) mq_unlink(p->path);
break;
case SOCKET_SOCKET:
(void) socket_address_unlink(&p->address);
break;
default:
break;
}
}
if (s->remove_on_stop)
STRV_FOREACH(i, s->symlinks)
(void) unlink(*i);
}
static void socket_apply_socket_options(Socket *s, int fd) {
int r;
assert(s);
assert(fd >= 0);
if (s->keep_alive) {
int one = 1;
if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)) < 0)
log_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m");
}
if (s->keep_alive_time > 0) {
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 > 0) {
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 > 0) {
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 > 0) {
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 one = 1;
if (s->socket_protocol == IPPROTO_SCTP) {
if (setsockopt(fd, SOL_SCTP, SCTP_NODELAY, &one, sizeof(one)) < 0)
log_unit_warning_errno(UNIT(s), errno, "SCTP_NODELAY failed: %m");
} else {
if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one)) < 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);
(void) 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;
}
return TAKE_FD(fd);
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;
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;
return TAKE_FD(fd);
}
static int usbffs_address_create(const char *path) {
_cleanup_close_ int fd = -1;
struct stat st;
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;
return TAKE_FD(fd);
}
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;
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;
return TAKE_FD(fd);
}
static int socket_symlink(Socket *s) {
const char *p;
char **i;
int r;
assert(s);
p = socket_find_symlink_target(s);
if (!p)
return 0;
STRV_FOREACH(i, s->symlinks) {
(void) mkdir_parents_label(*i, s->directory_mode);
r = symlink_idempotent(p, *i);
if (r == -EEXIST && s->remove_on_stop) {
/* If there's already something where we want to create the symlink, and the destructive
* RemoveOnStop= mode is set, then we might as well try to remove what already exists and try
* again. */
if (unlink(*i) >= 0)
r = symlink_idempotent(p, *i);
}
if (r < 0)
log_unit_warning_errno(UNIT(s), r, "Failed to create symlink %s → %s, ignoring: %m", 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, 0);
if (r < 0)
return r;
return copy_file_fd(s->usb_function_strings, fd, 0);
}
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;
size_t n, k, i;
int r;
r = scandir(p->path, &ent, usbffs_select_ep, alphasort);
if (r < 0)
return -errno;
n = (size_t) r;
p->auxiliary_fds = new(int, n);
if (!p->auxiliary_fds) {
r = -ENOMEM;
goto clear;
}
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, p->path);
if (!ep) {
r = -ENOMEM;
goto fail;
}
path_simplify(ep, false);
r = usbffs_address_create(ep);
if (r < 0)
goto fail;
p->auxiliary_fds[k++] = r;
}
r = 0;
goto clear;
fail:
close_many(p->auxiliary_fds, k);
p->auxiliary_fds = mfree(p->auxiliary_fds);
p->n_auxiliary_fds = 0;
clear:
for (i = 0; i < n; ++i)
free(ent[i]);
return r;
}
static int socket_determine_selinux_label(Socket *s, char **ret) {
Service *service;
ExecCommand *c;
_cleanup_free_ char *path = NULL;
int r;
assert(s);
assert(ret);
if (s->selinux_context_from_net) {
/* If this is requested, get label from the network label */
r = mac_selinux_get_our_label(ret);
if (r == -EOPNOTSUPP)
goto no_label;
} else {
/* Otherwise, get it from the executable we are about to start */
r = socket_instantiate_service(s);
if (r < 0)
return r;
if (!UNIT_ISSET(s->service))
goto no_label;
service = SERVICE(UNIT_DEREF(s->service));
c = service->exec_command[SERVICE_EXEC_START];
if (!c)
goto no_label;
r = chase_symlinks(c->path, service->exec_context.root_directory, CHASE_PREFIX_ROOT, &path);
if (r < 0)
goto no_label;
r = mac_selinux_get_create_label_from_exe(path, ret);
if (IN_SET(r, -EPERM, -EOPNOTSUPP))
goto no_label;
}
return r;
no_label:
*ret = NULL;
return 0;
}
static int socket_address_listen_do(
Socket *s,
const SocketAddress *address,
const char *label) {
assert(s);
assert(address);
return socket_address_listen(
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);
}
static int socket_address_listen_in_cgroup(
Socket *s,
const SocketAddress *address,
const char *label) {
_cleanup_close_pair_ int pair[2] = { -1, -1 };
int fd, r;
pid_t pid;
assert(s);
assert(address);
/* This is a wrapper around socket_address_listen(), that forks off a helper process inside the socket's cgroup
* in which the socket is actually created. This way we ensure the socket is actually properly attached to the
* unit's cgroup for the purpose of BPF filtering and such. */
if (!IN_SET(address->sockaddr.sa.sa_family, AF_INET, AF_INET6))
goto shortcut; /* BPF filtering only applies to IPv4 + IPv6, shortcut things for other protocols */
r = bpf_firewall_supported();
if (r < 0)
return r;
if (r == BPF_FIREWALL_UNSUPPORTED) /* If BPF firewalling isn't supported anyway — there's no point in this forking complexity */
goto shortcut;
if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
r = unit_fork_helper_process(UNIT(s), "(sd-listen)", &pid);
if (r < 0)
return log_unit_error_errno(UNIT(s), r, "Failed to fork off listener stub process: %m");
if (r == 0) {
/* Child */
pair[0] = safe_close(pair[0]);
fd = socket_address_listen_do(s, address, label);
if (fd < 0) {
log_unit_error_errno(UNIT(s), fd, "Failed to create listening socket: %m");
_exit(EXIT_FAILURE);
}
r = send_one_fd(pair[1], fd, 0);
if (r < 0) {
log_unit_error_errno(UNIT(s), r, "Failed to send listening socket to parent: %m");
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
pair[1] = safe_close(pair[1]);
fd = receive_one_fd(pair[0], 0);
/* We synchronously wait for the helper, as it shouldn't be slow */
r = wait_for_terminate_and_check("(sd-listen)", pid, WAIT_LOG_ABNORMAL);
if (r < 0) {
safe_close(fd);
return r;
}
if (fd < 0)
return log_unit_error_errno(UNIT(s), fd, "Failed to receive listening socket: %m");
return fd;
shortcut:
fd = socket_address_listen_do(s, address, label);
if (fd < 0)
return log_error_errno(fd, "Failed to create listening socket: %m");
return fd;
}
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. */
r = socket_determine_selinux_label(s, &label);
if (r < 0)
goto rollback;
know_label = true;
}
/* Apply the socket protocol */
switch (p->address.type) {
case SOCK_STREAM:
case SOCK_SEQPACKET:
if (s->socket_protocol == IPPROTO_SCTP)
p->address.protocol = s->socket_protocol;
break;
case SOCK_DGRAM:
if (s->socket_protocol == IPPROTO_UDPLITE)
p->address.protocol = s->socket_protocol;
break;
}
r = socket_address_listen_in_cgroup(s, &p->address, 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: {
_cleanup_free_ char *ep = NULL;
ep = path_make_absolute("ep0", p->path);
p->fd = usbffs_address_create(ep);
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;
}
enum {
SOCKET_OPEN_NONE,
SOCKET_OPEN_SOME,
SOCKET_OPEN_ALL,
};
static int socket_check_open(Socket *s) {
bool have_open = false, have_closed = false;
SocketPort *p;
assert(s);
LIST_FOREACH(port, p, s->ports) {
if (p->fd < 0)
have_closed = true;
else
have_open = true;
if (have_open && have_closed)
return SOCKET_OPEN_SOME;
}
if (have_open)
return SOCKET_OPEN_ALL;
return SOCKET_OPEN_NONE;
}
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], 0);
}
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, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
if (r < 0)
return r;
}
if (IN_SET(s->deserialized_state,
SOCKET_START_CHOWN,
SOCKET_START_POST,
SOCKET_LISTENING,
SOCKET_RUNNING)) {
/* Originally, we used to simply reopen all sockets here that we didn't have file descriptors
* for. However, this is problematic, as we won't traverse throught the SOCKET_START_CHOWN state for
* them, and thus the UID/GID wouldn't be right. Hence, instead simply check if we have all fds open,
* and if there's a mismatch, warn loudly. */
r = socket_check_open(s);
if (r == SOCKET_OPEN_NONE)
log_unit_warning(UNIT(s),
"Socket unit configuration has changed while unit has been running, "
"no open socket file descriptor left. "
"The socket unit is not functional until restarted.");
else if (r == SOCKET_OPEN_SOME)
log_unit_warning(UNIT(s),
"Socket unit configuration has changed while unit has been running, "
"and some socket file descriptors have not been opened yet. "
"The socket unit is not fully functional until restarted.");
}
if (s->deserialized_state == SOCKET_LISTENING) {
r = socket_watch_fds(s);
if (r < 0)
return r;
}
if (!IN_SET(s->deserialized_state, SOCKET_DEAD, SOCKET_FAILED)) {
(void) unit_setup_dynamic_creds(u);
(void) unit_setup_exec_runtime(u);
}
socket_set_state(s, s->deserialized_state);
return 0;
}
static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
ExecParameters exec_params = {
.flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
.stdin_fd = -1,
.stdout_fd = -1,
.stderr_fd = -1,
.exec_fd = -1,
};
pid_t pid;
int r;
assert(s);
assert(c);
assert(_pid);
r = unit_prepare_exec(UNIT(s));
if (r < 0)
return r;
r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
if (r < 0)
return r;
unit_set_exec_params(UNIT(s), &exec_params);
r = exec_spawn(UNIT(s),
c,
&s->exec_context,
&exec_params,
s->exec_runtime,
&s->dynamic_creds,
&pid);
if (r < 0)
return r;
r = unit_watch_pid(UNIT(s), pid);
if (r < 0)
/* FIXME: we need to do something here */
return r;
*_pid = pid;
return 0;
}
static int socket_chown(Socket *s, pid_t *_pid) {
pid_t pid;
int r;
r = socket_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
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? */
r = unit_fork_helper_process(UNIT(s), "(sd-chown)", &pid);
if (r < 0)
return r;
if (r == 0) {
uid_t uid = UID_INVALID;
gid_t gid = GID_INVALID;
SocketPort *p;
/* Child */
if (!isempty(s->user)) {
const char *user = s->user;
r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
if (r < 0) {
log_unit_error_errno(UNIT(s), r, "Failed to resolve user %s: %m", user);
_exit(EXIT_USER);
}
}
if (!isempty(s->group)) {
const char *group = s->group;
r = get_group_creds(&group, &gid, 0);
if (r < 0) {
log_unit_error_errno(UNIT(s), r, "Failed to resolve group %s: %m", group);
_exit(EXIT_GROUP);
}
}
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) {
log_unit_error_errno(UNIT(s), errno, "Failed to chown(): %m");
_exit(EXIT_CHOWN);
}
}
_exit(EXIT_SUCCESS);
}
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 (s->result == SOCKET_SUCCESS)
s->result = f;
if (s->result != SOCKET_SUCCESS)
log_unit_warning(UNIT(s), "Failed with result '%s'.", socket_result_to_string(s->result));
socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
unit_unref_uid_gid(UNIT(s), true);
dynamic_creds_destroy(&s->dynamic_creds);
}
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 (s->result == 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 (s->result == SOCKET_SUCCESS)
s->result = f;
r = unit_kill_context(
UNIT(s),
&s->kill_context,
!IN_SET(state, SOCKET_STOP_PRE_SIGTERM, 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, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
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 (IN_SET(state, SOCKET_STOP_PRE_SIGTERM, 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 (s->result == 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);
unit_warn_leftover_processes(UNIT(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 flush_ports(Socket *s) {
SocketPort *p;
/* Flush all incoming traffic, regardless if actual bytes or new connections, so that this socket isn't busy
* anymore */
LIST_FOREACH(port, p, s->ports) {
if (p->fd < 0)
continue;
(void) flush_accept(p->fd);
(void) flush_fd(p->fd);
}
}
static void socket_enter_running(Socket *s, int cfd) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
/* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
* close it. */
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)
goto refuse;
else
flush_ports(s);
return;
}
if (!ratelimit_below(&s->trigger_limit)) {
log_unit_warning(UNIT(s), "Trigger limit hit, refusing further activation.");
socket_enter_stop_pre(s, SOCKET_FAILURE_TRIGGER_LIMIT_HIT);
goto refuse;
}
if (cfd < 0) {
bool pending = false;
Unit *other;
Iterator i;
void *v;
/* If there's already a start pending don't bother to
* do anything */
HASHMAP_FOREACH_KEY(v, 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;
_cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
Service *service;
if (s->n_connections >= s->max_connections) {
log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
s->n_connections);
goto refuse;
}
if (s->max_connections_per_source > 0) {
r = socket_acquire_peer(s, cfd, &p);
if (r < 0) {
goto refuse;
} else if (r > 0 && p->n_ref > s->max_connections_per_source) {
_cleanup_free_ char *t = NULL;
(void) sockaddr_pretty(&p->peer.sa, p->peer_salen, true, false, &t);
log_unit_warning(UNIT(s),
"Too many incoming connections (%u) from source %s, dropping connection.",
p->n_ref, strnull(t));
goto refuse;
}
}
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. */
log_unit_debug(UNIT(s), "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
goto refuse;
}
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_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; /* We passed ownership of the fd to the service now. Forget it here. */
s->n_connections++;
service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, &error, NULL);
if (r < 0) {
/* We failed to activate the new service, but it still exists. Let's make sure the service
* closes and forgets the connection fd again, immediately. */
service_close_socket_fd(service);
goto fail;
}
/* Notify clients about changed counters */
unit_add_to_dbus_queue(UNIT(s));
}
return;
refuse:
s->n_refused++;
safe_close(cfd);
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);
int r;
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 (!IN_SET(service->state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
log_unit_error(u, "Socket service %s already active, refusing.", UNIT(service)->id);
return -EBUSY;
}
}
assert(IN_SET(s->state, SOCKET_DEAD, SOCKET_FAILED));
r = unit_start_limit_test(u);
if (r < 0) {
socket_enter_dead(s, SOCKET_FAILURE_START_LIMIT_HIT);
return r;
}
r = unit_acquire_invocation_id(u);
if (r < 0)
return r;
s->result = SOCKET_SUCCESS;
exec_command_reset_status_list_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
u->reset_accounting = 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(IN_SET(s->state, SOCKET_LISTENING, 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);
unit_serialize_item_format(u, f, "n-refused", "%u", s->n_refused);
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 void socket_port_take_fd(SocketPort *p, FDSet *fds, int fd) {
safe_close(p->fd);
p->fd = fdset_remove(fds, fd);
}
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, "n-refused")) {
unsigned k;
if (safe_atou(value, &k) < 0)
log_unit_debug(u, "Failed to parse n-refused value: %s", value);
else
s->n_refused += 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, 0)) {
socket_port_take_fd(p, fds, fd);
break;
}
} 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, 0)) {
socket_port_take_fd(p, fds, fd);
break;
}
} 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)) {
socket_port_take_fd(p, fds, fd);
break;
}
} 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)) {
socket_port_take_fd(p, fds, fd);
break;
}
} 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)) {
socket_port_take_fd(p, fds, fd);
break;
}
} 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, 0)) {
socket_port_take_fd(p, fds, fd);
break;
}
} 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";
_fallthrough_;
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;
}
}
SocketType socket_port_type_from_string(const char *s) {
assert(s);
if (STR_IN_SET(s, "Stream", "Datagram", "SequentialPacket", "Netlink"))
return SOCKET_SOCKET;
else if (streq(s, "Special"))
return SOCKET_SPECIAL;
else if (streq(s, "MessageQueue"))
return SOCKET_MQUEUE;
else if (streq(s, "FIFO"))
return SOCKET_FIFO;
else if (streq(s, "USBFunction"))
return SOCKET_USB_FUNCTION;
else
return _SOCKET_TYPE_INVALID;
}
_pure_ static bool socket_may_gc(Unit *u) {
Socket *s = SOCKET(u);
assert(u);
return s->n_connections == 0;
}
static int socket_accept_do(Socket *s, int fd) {
int cfd;
assert(s);
assert(fd >= 0);
for (;;) {
cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
if (cfd < 0) {
if (errno == EINTR)
continue;
return -errno;
}
break;
}
return cfd;
}
static int socket_accept_in_cgroup(Socket *s, SocketPort *p, int fd) {
_cleanup_close_pair_ int pair[2] = { -1, -1 };
int cfd, r;
pid_t pid;
assert(s);
assert(p);
assert(fd >= 0);
/* Similar to socket_address_listen_in_cgroup(), but for accept() rathern than socket(): make sure that any
* connection socket is also properly associated with the cgroup. */
if (!IN_SET(p->address.sockaddr.sa.sa_family, AF_INET, AF_INET6))
goto shortcut;
r = bpf_firewall_supported();
if (r < 0)
return r;
if (r == BPF_FIREWALL_UNSUPPORTED)
goto shortcut;
if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pair) < 0)
return log_unit_error_errno(UNIT(s), errno, "Failed to create communication channel: %m");
r = unit_fork_helper_process(UNIT(s), "(sd-accept)", &pid);
if (r < 0)
return log_unit_error_errno(UNIT(s), r, "Failed to fork off accept stub process: %m");
if (r == 0) {
/* Child */
pair[0] = safe_close(pair[0]);
cfd = socket_accept_do(s, fd);
if (cfd < 0) {
log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
_exit(EXIT_FAILURE);
}
r = send_one_fd(pair[1], cfd, 0);
if (r < 0) {
log_unit_error_errno(UNIT(s), r, "Failed to send connection socket to parent: %m");
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
pair[1] = safe_close(pair[1]);
cfd = receive_one_fd(pair[0], 0);
/* We synchronously wait for the helper, as it shouldn't be slow */
r = wait_for_terminate_and_check("(sd-accept)", pid, WAIT_LOG_ABNORMAL);
if (r < 0) {
safe_close(cfd);
return r;
}
if (cfd < 0)
return log_unit_error_errno(UNIT(s), cfd, "Failed to receive connection socket: %m");
return cfd;
shortcut:
cfd = socket_accept_do(s, fd);
if (cfd < 0)
return log_unit_error_errno(UNIT(s), cfd, "Failed to accept connection socket: %m");
return cfd;
}
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)) {
cfd = socket_accept_in_cgroup(p->socket, p, fd);
if (cfd < 0)
goto fail;
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, EXIT_CLEAN_COMMAND, 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->flags & EXEC_COMMAND_IGNORE_FAILURE)
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 (s->result == 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) {
size_t k = 0, n = 0;
SocketPort *p;
int *rfds;
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) {
size_t 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 (int) 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;
}
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);
assert(u);
assert(other);
/* Filter out invocations with bogus state */
if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
return;
/* Don't propagate state changes from the service if we are already down */
if (!IN_SET(s->state, SOCKET_RUNNING, SOCKET_LISTENING))
return;
/* We don't care for the service state if we are in Accept=yes mode */
if (s->accept)
return;
/* Propagate start limit hit state */
if (other->start_limit_hit) {
socket_enter_stop_pre(s, SOCKET_FAILURE_SERVICE_START_LIMIT_HIT);
return;
}
/* Don't propagate anything if there's still a job queued */
if (other->job)
return;
if (IN_SET(SERVICE(other)->state,
SERVICE_DEAD, SERVICE_FAILED,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
SERVICE_AUTO_RESTART))
socket_enter_listening(s);
if (SERVICE(other)->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, usec_t *timeout) {
Socket *s = SOCKET(u);
usec_t t;
int r;
if (!s->timer_event_source)
return 0;
r = sd_event_source_get_time(s->timer_event_source, &t);
if (r < 0)
return r;
if (t == USEC_INFINITY)
return 0;
*timeout = t;
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. */
return s->fdname ?: UNIT(s)->id;
}
static int socket_control_pid(Unit *u) {
Socket *s = SOCKET(u);
assert(s);
return s->control_pid;
}
static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
[SOCKET_EXEC_START_PRE] = "ExecStartPre",
[SOCKET_EXEC_START_CHOWN] = "ExecStartChown",
[SOCKET_EXEC_START_POST] = "ExecStartPost",
[SOCKET_EXEC_STOP_PRE] = "ExecStopPre",
[SOCKET_EXEC_STOP_POST] = "ExecStopPost"
};
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_START_LIMIT_HIT] = "start-limit-hit",
[SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
[SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
};
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),
.dynamic_creds_offset = offsetof(Socket, dynamic_creds),
.sections =
"Unit\0"
"Socket\0"
"Install\0",
.private_section = "Socket",
.can_transient = true,
.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,
.may_gc = socket_may_gc,
.sigchld_event = socket_sigchld_event,
.trigger_notify = socket_trigger_notify,
.reset_failed = socket_reset_failed,
.control_pid = socket_control_pid,
.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.",
},
},
};
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