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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
2a796654 | 2 | |
2a796654 | 3 | #include <errno.h> |
54340751 | 4 | #include <fcntl.h> |
07630cea | 5 | #include <unistd.h> |
2a796654 | 6 | |
b5efdb8a | 7 | #include "alloc-util.h" |
66855de7 | 8 | #include "errno-util.h" |
3ffd4af2 | 9 | #include "fd-util.h" |
07630cea | 10 | #include "fileio.h" |
afe44c8f | 11 | #include "generator.h" |
2a796654 | 12 | #include "log.h" |
35cd0ba5 | 13 | #include "mkdir-label.h" |
ee3fddcc | 14 | #include "parse-util.h" |
1d97ff7d | 15 | #include "path-util.h" |
0b452006 | 16 | #include "process-util.h" |
ee3fddcc | 17 | #include "proc-cmdline.h" |
9d22f97b | 18 | #include "strv.h" |
288a74cc | 19 | #include "terminal-util.h" |
07630cea LP |
20 | #include "unit-name.h" |
21 | #include "util.h" | |
22 | #include "virt.h" | |
2a796654 | 23 | |
9d22f97b | 24 | static const char *arg_dest = NULL; |
ee3fddcc | 25 | static bool arg_enabled = true; |
2a796654 LP |
26 | |
27 | static int add_symlink(const char *fservice, const char *tservice) { | |
f5650614 | 28 | char *from, *to; |
2a796654 LP |
29 | int r; |
30 | ||
4dc380d1 LP |
31 | assert(fservice); |
32 | assert(tservice); | |
33 | ||
835cf75a | 34 | from = strjoina(SYSTEM_DATA_UNIT_DIR "/", fservice); |
63c372cb | 35 | to = strjoina(arg_dest, "/getty.target.wants/", tservice); |
2a796654 | 36 | |
35cd0ba5 | 37 | (void) mkdir_parents_label(to, 0755); |
2a796654 | 38 | |
a17b785b LP |
39 | r = symlink(from, to); |
40 | if (r < 0) { | |
7410616c | 41 | /* In case console=hvc0 is passed this will very likely result in EEXIST */ |
a17b785b | 42 | if (errno == EEXIST) |
f85fc845 | 43 | return 0; |
7410616c LP |
44 | |
45 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
2a796654 LP |
46 | } |
47 | ||
f85fc845 | 48 | return 0; |
2a796654 LP |
49 | } |
50 | ||
4dc380d1 | 51 | static int add_serial_getty(const char *tty) { |
f85fc845 | 52 | _cleanup_free_ char *n = NULL; |
7410616c | 53 | int r; |
4dc380d1 LP |
54 | |
55 | assert(tty); | |
56 | ||
57 | log_debug("Automatically adding serial getty for /dev/%s.", tty); | |
58 | ||
7410616c LP |
59 | r = unit_name_from_path_instance("serial-getty", tty, ".service", &n); |
60 | if (r < 0) | |
61 | return log_error_errno(r, "Failed to generate service name: %m"); | |
4dc380d1 | 62 | |
f85fc845 | 63 | return add_symlink("serial-getty@.service", n); |
4dc380d1 LP |
64 | } |
65 | ||
1d97ff7d LP |
66 | static int add_container_getty(const char *tty) { |
67 | _cleanup_free_ char *n = NULL; | |
7410616c | 68 | int r; |
1d97ff7d LP |
69 | |
70 | assert(tty); | |
71 | ||
72 | log_debug("Automatically adding container getty for /dev/pts/%s.", tty); | |
73 | ||
7410616c LP |
74 | r = unit_name_from_path_instance("container-getty", tty, ".service", &n); |
75 | if (r < 0) | |
76 | return log_error_errno(r, "Failed to generate service name: %m"); | |
1d97ff7d LP |
77 | |
78 | return add_symlink("container-getty@.service", n); | |
79 | } | |
80 | ||
54340751 LP |
81 | static int verify_tty(const char *name) { |
82 | _cleanup_close_ int fd = -1; | |
83 | const char *p; | |
84 | ||
85 | /* Some TTYs are weird and have been enumerated but don't work | |
86 | * when you try to use them, such as classic ttyS0 and | |
87 | * friends. Let's check that and open the device and run | |
88 | * isatty() on it. */ | |
89 | ||
63c372cb | 90 | p = strjoina("/dev/", name); |
54340751 LP |
91 | |
92 | /* O_NONBLOCK is essential here, to make sure we don't wait | |
93 | * for DCD */ | |
94 | fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW); | |
95 | if (fd < 0) | |
96 | return -errno; | |
97 | ||
98 | errno = 0; | |
99 | if (isatty(fd) <= 0) | |
66855de7 | 100 | return errno_or_else(EIO); |
54340751 LP |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
2417658d ZJS |
105 | static int run_container(void) { |
106 | _cleanup_free_ char *container_ttys = NULL; | |
1d97ff7d | 107 | int r; |
2a796654 | 108 | |
2417658d | 109 | log_debug("Automatically adding console shell."); |
07719a21 | 110 | |
2417658d ZJS |
111 | r = add_symlink("console-getty.service", "console-getty.service"); |
112 | if (r < 0) | |
113 | return r; | |
1d97ff7d | 114 | |
2417658d ZJS |
115 | /* When $container_ttys is set for PID 1, spawn gettys on all ptys named therein. |
116 | * Note that despite the variable name we only support ptys here. */ | |
2a796654 | 117 | |
2417658d | 118 | (void) getenv_for_pid(1, "container_ttys", &container_ttys); |
2a796654 | 119 | |
2417658d ZJS |
120 | for (const char *p = container_ttys;;) { |
121 | _cleanup_free_ char *word = NULL; | |
1d97ff7d | 122 | |
2417658d ZJS |
123 | r = extract_first_word(&p, &word, NULL, 0); |
124 | if (r < 0) | |
125 | return log_error_errno(r, "Failed to parse $container_ttys: %m"); | |
126 | if (r == 0) | |
127 | return 0; | |
1d97ff7d | 128 | |
2417658d | 129 | const char *tty = word; |
1d97ff7d | 130 | |
2417658d ZJS |
131 | /* First strip off /dev/ if it is specified */ |
132 | tty = path_startswith(tty, "/dev/") ?: tty; | |
1d97ff7d | 133 | |
2417658d ZJS |
134 | /* Then, make sure it's actually a pty */ |
135 | tty = path_startswith(tty, "pts/"); | |
136 | if (!tty) | |
137 | continue; | |
1d97ff7d | 138 | |
2417658d ZJS |
139 | r = add_container_getty(tty); |
140 | if (r < 0) | |
141 | return r; | |
142 | } | |
143 | } | |
1d97ff7d | 144 | |
ee3fddcc LB |
145 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
146 | int r; | |
147 | ||
148 | assert(key); | |
149 | ||
150 | if (proc_cmdline_key_streq(key, "systemd.getty_auto")) { | |
151 | r = value ? parse_boolean(value) : 1; | |
152 | if (r < 0) | |
153 | log_warning_errno(r, "Failed to parse getty_auto switch \"%s\", ignoring: %m", value); | |
154 | else | |
155 | arg_enabled = r; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
2417658d | 161 | static int run(const char *dest, const char *dest_early, const char *dest_late) { |
ee3fddcc | 162 | _cleanup_free_ char *getty_auto = NULL; |
2417658d | 163 | int r; |
1d97ff7d | 164 | |
2417658d | 165 | assert_se(arg_dest = dest); |
2a796654 | 166 | |
ee3fddcc LB |
167 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0); |
168 | if (r < 0) | |
169 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); | |
170 | ||
171 | r = getenv_for_pid(1, "SYSTEMD_GETTY_AUTO", &getty_auto); | |
172 | if (r < 0) | |
173 | log_warning_errno(r, "Failed to parse $SYSTEMD_GETTY_AUTO environment variable, ignoring: %m"); | |
174 | else if (r > 0) { | |
175 | r = parse_boolean(getty_auto); | |
176 | if (r < 0) | |
177 | log_warning_errno(r, "Failed to parse $SYSTEMD_GETTY_AUTO value \"%s\", ignoring: %m", getty_auto); | |
178 | else | |
179 | arg_enabled = r; | |
180 | } | |
181 | ||
182 | if (!arg_enabled) { | |
183 | log_debug("Disabled, exiting."); | |
184 | return 0; | |
185 | } | |
186 | ||
2417658d ZJS |
187 | if (detect_container() > 0) |
188 | /* Add console shell and look at $container_ttys, but don't do add any | |
189 | * further magic if we are in a container. */ | |
190 | return run_container(); | |
39f0570d | 191 | |
2417658d ZJS |
192 | /* Automatically add in a serial getty on all active kernel consoles */ |
193 | _cleanup_free_ char *active = NULL; | |
194 | (void) read_one_line_file("/sys/class/tty/console/active", &active); | |
195 | for (const char *p = active;;) { | |
196 | _cleanup_free_ char *tty = NULL; | |
2a796654 | 197 | |
2417658d ZJS |
198 | r = extract_first_word(&p, &tty, NULL, 0); |
199 | if (r < 0) | |
200 | return log_error_errno(r, "Failed to parse /sys/class/tty/console/active: %m"); | |
201 | if (r == 0) | |
202 | break; | |
39f0570d | 203 | |
2417658d ZJS |
204 | /* We assume that gettys on virtual terminals are started via manual configuration and do |
205 | * this magic only for non-VC terminals. */ | |
54194afb | 206 | |
2417658d ZJS |
207 | if (isempty(tty) || tty_is_vc(tty)) |
208 | continue; | |
39f0570d | 209 | |
2417658d ZJS |
210 | if (verify_tty(tty) < 0) |
211 | continue; | |
54340751 | 212 | |
2417658d ZJS |
213 | r = add_serial_getty(tty); |
214 | if (r < 0) | |
215 | return r; | |
2a796654 LP |
216 | } |
217 | ||
218 | /* Automatically add in a serial getty on the first | |
219 | * virtualizer console */ | |
2417658d | 220 | const char *j; |
9d22f97b ZJS |
221 | FOREACH_STRING(j, |
222 | "hvc0", | |
223 | "xvc0", | |
224 | "hvsi0", | |
225 | "sclp_line0", | |
226 | "ttysclp0", | |
227 | "3270!tty1") { | |
6d946490 | 228 | _cleanup_free_ char *p = NULL; |
980fc73d | 229 | |
6d946490 YW |
230 | p = path_join("/sys/class/tty", j); |
231 | if (!p) | |
232 | return -ENOMEM; | |
f85fc845 | 233 | if (access(p, F_OK) < 0) |
3c20189a | 234 | continue; |
980fc73d | 235 | |
9d22f97b ZJS |
236 | r = add_serial_getty(j); |
237 | if (r < 0) | |
238 | return r; | |
2a796654 LP |
239 | } |
240 | ||
9d22f97b | 241 | return 0; |
2a796654 | 242 | } |
9d22f97b ZJS |
243 | |
244 | DEFINE_MAIN_GENERATOR_FUNCTION(run); |