1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/* $OpenBSD$ */
/*
* Copyright (c) 2022 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/un.h>
#include <systemd/sd-bus.h>
#include <systemd/sd-daemon.h>
#include <systemd/sd-login.h>
#include <systemd/sd-id128.h>
#include <string.h>
#include "tmux.h"
int
systemd_activated(void)
{
return (sd_listen_fds(0) >= 1);
}
int
systemd_create_socket(int flags, char **cause)
{
int fds;
int fd;
struct sockaddr_un sa;
socklen_t addrlen = sizeof sa;
fds = sd_listen_fds(0);
if (fds > 1) { /* too many file descriptors */
errno = E2BIG;
goto fail;
}
if (fds == 1) { /* socket-activated */
fd = SD_LISTEN_FDS_START;
if (!sd_is_socket_unix(fd, SOCK_STREAM, 1, NULL, 0)) {
errno = EPFNOSUPPORT;
goto fail;
}
if (getsockname(fd, (struct sockaddr *)&sa, &addrlen) == -1)
goto fail;
socket_path = xstrdup(sa.sun_path);
return (fd);
}
return (server_create_socket(flags, cause));
fail:
if (cause != NULL)
xasprintf(cause, "systemd socket error (%s)", strerror(errno));
return (-1);
}
int
systemd_move_pid_to_new_cgroup(pid_t pid, char **cause)
{
sd_bus_error error = SD_BUS_ERROR_NULL;
sd_bus_message *m = NULL, *reply = NULL;
sd_bus *bus = NULL;
char *name, *desc, *slice;
sd_id128_t uuid;
int r;
pid_t parent_pid;
/* Connect to the session bus. */
r = sd_bus_default_user(&bus);
if (r < 0) {
xasprintf(cause, "failed to connect to session bus: %s",
strerror(-r));
goto finish;
}
/* Start building the method call. */
r = sd_bus_message_new_method_call(bus, &m,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StartTransientUnit");
if (r < 0) {
xasprintf(cause, "failed to create bus message: %s",
strerror(-r));
goto finish;
}
/* Generate a unique name for the new scope, to avoid collisions. */
r = sd_id128_randomize(&uuid);
if (r < 0) {
xasprintf(cause, "failed to generate uuid: %s", strerror(-r));
goto finish;
}
xasprintf(&name, "tmux-spawn-" SD_ID128_UUID_FORMAT_STR ".scope",
SD_ID128_FORMAT_VAL(uuid));
r = sd_bus_message_append(m, "s", name);
free(name);
if (r < 0) {
xasprintf(cause, "failed to append to bus message: %s",
strerror(-r));
goto finish;
}
/* Mode: fail if there's a queued unit with the same name. */
r = sd_bus_message_append(m, "s", "fail");
if (r < 0) {
xasprintf(cause, "failed to append to bus message: %s",
strerror(-r));
goto finish;
}
/* Start properties array. */
r = sd_bus_message_open_container(m, 'a', "(sv)");
if (r < 0) {
xasprintf(cause, "failed to start properties array: %s",
strerror(-r));
goto finish;
}
parent_pid = getpid();
xasprintf(&desc, "tmux child pane %ld launched by process %ld",
(long)pid, (long)parent_pid);
r = sd_bus_message_append(m, "(sv)", "Description", "s", desc);
free(desc);
if (r < 0) {
xasprintf(cause, "failed to append to properties: %s",
strerror(-r));
goto finish;
}
/*
* Inherit the slice from the parent process, or default to
* "app-tmux.slice" if that fails.
*/
r = sd_pid_get_user_slice(parent_pid, &slice);
if (r < 0) {
slice = xstrdup("app-tmux.slice");
}
r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice);
free(slice);
if (r < 0) {
xasprintf(cause, "failed to append to properties: %s",
strerror(-r));
goto finish;
}
/* PIDs to add to the scope: length - 1 array of uint32_t. */
r = sd_bus_message_append(m, "(sv)", "PIDs", "au", 1, pid);
if (r < 0) {
xasprintf(cause, "failed to append to properties: %s",
strerror(-r));
goto finish;
}
/* Clean up the scope even if it fails. */
r = sd_bus_message_append(m, "(sv)", "CollectMode", "s",
"inactive-or-failed");
if (r < 0) {
xasprintf(cause, "failed to append to properties: %s",
strerror(-r));
goto finish;
}
/* End properties array. */
r = sd_bus_message_close_container(m);
if (r < 0) {
xasprintf(cause, "failed to end properties array: %s",
strerror(-r));
goto finish;
}
/* aux is currently unused and should be passed an empty array. */
r = sd_bus_message_append(m, "a(sa(sv))", 0);
if (r < 0) {
xasprintf(cause, "failed to append to bus message: %s",
strerror(-r));
goto finish;
}
/* Call the method with a timeout of 1 second = 1e6 us. */
r = sd_bus_call(bus, m, 1000000, &error, &reply);
if (r < 0) {
if (error.message != NULL) {
/* We have a specific error message from sd-bus. */
xasprintf(cause, "StartTransientUnit call failed: %s",
error.message);
} else {
xasprintf(cause, "StartTransientUnit call failed: %s",
strerror(-r));
}
goto finish;
}
finish:
sd_bus_error_free(&error);
sd_bus_message_unref(m);
sd_bus_message_unref(reply);
sd_bus_unref(bus);
return (r);
}
|
