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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2a796654 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
2a796654 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
2a796654 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
2a796654 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
2a796654 | 21 | #include <errno.h> |
54340751 | 22 | #include <fcntl.h> |
07630cea LP |
23 | #include <string.h> |
24 | #include <unistd.h> | |
2a796654 | 25 | |
b5efdb8a | 26 | #include "alloc-util.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
07630cea | 28 | #include "fileio.h" |
2a796654 | 29 | #include "log.h" |
49e942b2 | 30 | #include "mkdir.h" |
1d97ff7d | 31 | #include "path-util.h" |
0b452006 | 32 | #include "process-util.h" |
07630cea | 33 | #include "string-util.h" |
288a74cc | 34 | #include "terminal-util.h" |
07630cea LP |
35 | #include "unit-name.h" |
36 | #include "util.h" | |
37 | #include "virt.h" | |
2a796654 | 38 | |
6a39419f | 39 | static const char *arg_dest = "/tmp"; |
2a796654 LP |
40 | |
41 | static int add_symlink(const char *fservice, const char *tservice) { | |
f5650614 | 42 | char *from, *to; |
2a796654 LP |
43 | int r; |
44 | ||
4dc380d1 LP |
45 | assert(fservice); |
46 | assert(tservice); | |
47 | ||
63c372cb LP |
48 | from = strjoina(SYSTEM_DATA_UNIT_PATH "/", fservice); |
49 | to = strjoina(arg_dest, "/getty.target.wants/", tservice); | |
2a796654 | 50 | |
d2e54fae | 51 | mkdir_parents_label(to, 0755); |
2a796654 | 52 | |
a17b785b LP |
53 | r = symlink(from, to); |
54 | if (r < 0) { | |
7410616c | 55 | /* In case console=hvc0 is passed this will very likely result in EEXIST */ |
a17b785b | 56 | if (errno == EEXIST) |
f85fc845 | 57 | return 0; |
7410616c LP |
58 | |
59 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
2a796654 LP |
60 | } |
61 | ||
f85fc845 | 62 | return 0; |
2a796654 LP |
63 | } |
64 | ||
4dc380d1 | 65 | static int add_serial_getty(const char *tty) { |
f85fc845 | 66 | _cleanup_free_ char *n = NULL; |
7410616c | 67 | int r; |
4dc380d1 LP |
68 | |
69 | assert(tty); | |
70 | ||
71 | log_debug("Automatically adding serial getty for /dev/%s.", tty); | |
72 | ||
7410616c LP |
73 | r = unit_name_from_path_instance("serial-getty", tty, ".service", &n); |
74 | if (r < 0) | |
75 | return log_error_errno(r, "Failed to generate service name: %m"); | |
4dc380d1 | 76 | |
f85fc845 | 77 | return add_symlink("serial-getty@.service", n); |
4dc380d1 LP |
78 | } |
79 | ||
1d97ff7d LP |
80 | static int add_container_getty(const char *tty) { |
81 | _cleanup_free_ char *n = NULL; | |
7410616c | 82 | int r; |
1d97ff7d LP |
83 | |
84 | assert(tty); | |
85 | ||
86 | log_debug("Automatically adding container getty for /dev/pts/%s.", tty); | |
87 | ||
7410616c LP |
88 | r = unit_name_from_path_instance("container-getty", tty, ".service", &n); |
89 | if (r < 0) | |
90 | return log_error_errno(r, "Failed to generate service name: %m"); | |
1d97ff7d LP |
91 | |
92 | return add_symlink("container-getty@.service", n); | |
93 | } | |
94 | ||
54340751 LP |
95 | static int verify_tty(const char *name) { |
96 | _cleanup_close_ int fd = -1; | |
97 | const char *p; | |
98 | ||
99 | /* Some TTYs are weird and have been enumerated but don't work | |
100 | * when you try to use them, such as classic ttyS0 and | |
101 | * friends. Let's check that and open the device and run | |
102 | * isatty() on it. */ | |
103 | ||
63c372cb | 104 | p = strjoina("/dev/", name); |
54340751 LP |
105 | |
106 | /* O_NONBLOCK is essential here, to make sure we don't wait | |
107 | * for DCD */ | |
108 | fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW); | |
109 | if (fd < 0) | |
110 | return -errno; | |
111 | ||
112 | errno = 0; | |
113 | if (isatty(fd) <= 0) | |
f5e5c28f | 114 | return errno > 0 ? -errno : -EIO; |
54340751 LP |
115 | |
116 | return 0; | |
117 | } | |
118 | ||
2a796654 | 119 | int main(int argc, char *argv[]) { |
3c20189a LP |
120 | |
121 | static const char virtualization_consoles[] = | |
122 | "hvc0\0" | |
123 | "xvc0\0" | |
07901fc1 HB |
124 | "hvsi0\0" |
125 | "sclp_line0\0" | |
fc6c7fe9 HB |
126 | "ttysclp0\0" |
127 | "3270!tty1\0"; | |
3c20189a | 128 | |
f85fc845 | 129 | _cleanup_free_ char *active = NULL; |
3c20189a | 130 | const char *j; |
1d97ff7d | 131 | int r; |
2a796654 | 132 | |
07719a21 LP |
133 | if (argc > 1 && argc != 4) { |
134 | log_error("This program takes three or no arguments."); | |
2a796654 LP |
135 | return EXIT_FAILURE; |
136 | } | |
137 | ||
07719a21 LP |
138 | if (argc > 1) |
139 | arg_dest = argv[1]; | |
140 | ||
6c347d50 LP |
141 | log_set_prohibit_ipc(true); |
142 | log_set_target(LOG_TARGET_AUTO); | |
2a796654 LP |
143 | log_parse_environment(); |
144 | log_open(); | |
145 | ||
4c12626c LP |
146 | umask(0022); |
147 | ||
75f86906 | 148 | if (detect_container() > 0) { |
1d97ff7d LP |
149 | _cleanup_free_ char *container_ttys = NULL; |
150 | ||
6705c2df | 151 | log_debug("Automatically adding console shell."); |
2a796654 | 152 | |
337eebb9 | 153 | if (add_symlink("console-getty.service", "console-getty.service") < 0) |
f85fc845 | 154 | return EXIT_FAILURE; |
2a796654 | 155 | |
1d97ff7d LP |
156 | /* When $container_ttys is set for PID 1, spawn |
157 | * gettys on all ptys named therein. Note that despite | |
158 | * the variable name we only support ptys here. */ | |
159 | ||
160 | r = getenv_for_pid(1, "container_ttys", &container_ttys); | |
207d1d09 | 161 | if (r > 0) { |
a2a5291b | 162 | const char *word, *state; |
1d97ff7d LP |
163 | size_t l; |
164 | ||
a2a5291b | 165 | FOREACH_WORD(word, l, container_ttys, state) { |
1d97ff7d LP |
166 | const char *t; |
167 | char tty[l + 1]; | |
168 | ||
a2a5291b | 169 | memcpy(tty, word, l); |
1d97ff7d LP |
170 | tty[l] = 0; |
171 | ||
172 | /* First strip off /dev/ if it is specified */ | |
173 | t = path_startswith(tty, "/dev/"); | |
174 | if (!t) | |
175 | t = tty; | |
176 | ||
177 | /* Then, make sure it's actually a pty */ | |
3fa5dd6d | 178 | t = path_startswith(t, "pts/"); |
1d97ff7d LP |
179 | if (!t) |
180 | continue; | |
181 | ||
182 | if (add_container_getty(t) < 0) | |
183 | return EXIT_FAILURE; | |
184 | } | |
185 | } | |
186 | ||
2a796654 | 187 | /* Don't add any further magic if we are in a container */ |
f85fc845 | 188 | return EXIT_SUCCESS; |
2a796654 LP |
189 | } |
190 | ||
191 | if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { | |
a2a5291b | 192 | const char *word, *state; |
39f0570d MM |
193 | size_t l; |
194 | ||
195 | /* Automatically add in a serial getty on all active | |
196 | * kernel consoles */ | |
a2a5291b | 197 | FOREACH_WORD(word, l, active, state) { |
f85fc845 | 198 | _cleanup_free_ char *tty = NULL; |
2a796654 | 199 | |
a2a5291b | 200 | tty = strndup(word, l); |
39f0570d | 201 | if (!tty) { |
f85fc845 LP |
202 | log_oom(); |
203 | return EXIT_FAILURE; | |
39f0570d MM |
204 | } |
205 | ||
54194afb AJ |
206 | /* We assume that gettys on virtual terminals are |
207 | * started via manual configuration and do this magic | |
208 | * only for non-VC terminals. */ | |
209 | ||
f85fc845 | 210 | if (isempty(tty) || tty_is_vc(tty)) |
39f0570d | 211 | continue; |
39f0570d | 212 | |
54340751 LP |
213 | if (verify_tty(tty) < 0) |
214 | continue; | |
215 | ||
f85fc845 LP |
216 | if (add_serial_getty(tty) < 0) |
217 | return EXIT_FAILURE; | |
3c20189a | 218 | } |
2a796654 LP |
219 | } |
220 | ||
221 | /* Automatically add in a serial getty on the first | |
222 | * virtualizer console */ | |
3c20189a | 223 | NULSTR_FOREACH(j, virtualization_consoles) { |
f5650614 | 224 | char *p; |
980fc73d | 225 | |
63c372cb | 226 | p = strjoina("/sys/class/tty/", j); |
f85fc845 | 227 | if (access(p, F_OK) < 0) |
3c20189a | 228 | continue; |
980fc73d | 229 | |
f85fc845 LP |
230 | if (add_serial_getty(j) < 0) |
231 | return EXIT_FAILURE; | |
2a796654 LP |
232 | } |
233 | ||
f85fc845 | 234 | return EXIT_SUCCESS; |
2a796654 | 235 | } |