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2a796654 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
2a796654 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
2a796654 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
2a796654 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
2a796654 | 22 | #include <errno.h> |
54340751 | 23 | #include <fcntl.h> |
07630cea LP |
24 | #include <string.h> |
25 | #include <unistd.h> | |
2a796654 | 26 | |
07630cea | 27 | #include "fileio.h" |
2a796654 | 28 | #include "log.h" |
49e942b2 | 29 | #include "mkdir.h" |
1d97ff7d | 30 | #include "path-util.h" |
0b452006 | 31 | #include "process-util.h" |
07630cea | 32 | #include "string-util.h" |
288a74cc | 33 | #include "terminal-util.h" |
07630cea LP |
34 | #include "unit-name.h" |
35 | #include "util.h" | |
36 | #include "virt.h" | |
2a796654 | 37 | |
6a39419f | 38 | static const char *arg_dest = "/tmp"; |
2a796654 LP |
39 | |
40 | static int add_symlink(const char *fservice, const char *tservice) { | |
f5650614 | 41 | char *from, *to; |
2a796654 LP |
42 | int r; |
43 | ||
4dc380d1 LP |
44 | assert(fservice); |
45 | assert(tservice); | |
46 | ||
63c372cb LP |
47 | from = strjoina(SYSTEM_DATA_UNIT_PATH "/", fservice); |
48 | to = strjoina(arg_dest, "/getty.target.wants/", tservice); | |
2a796654 | 49 | |
d2e54fae | 50 | mkdir_parents_label(to, 0755); |
2a796654 | 51 | |
a17b785b LP |
52 | r = symlink(from, to); |
53 | if (r < 0) { | |
7410616c | 54 | /* In case console=hvc0 is passed this will very likely result in EEXIST */ |
a17b785b | 55 | if (errno == EEXIST) |
f85fc845 | 56 | return 0; |
7410616c LP |
57 | |
58 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
2a796654 LP |
59 | } |
60 | ||
f85fc845 | 61 | return 0; |
2a796654 LP |
62 | } |
63 | ||
4dc380d1 | 64 | static int add_serial_getty(const char *tty) { |
f85fc845 | 65 | _cleanup_free_ char *n = NULL; |
7410616c | 66 | int r; |
4dc380d1 LP |
67 | |
68 | assert(tty); | |
69 | ||
70 | log_debug("Automatically adding serial getty for /dev/%s.", tty); | |
71 | ||
7410616c LP |
72 | r = unit_name_from_path_instance("serial-getty", tty, ".service", &n); |
73 | if (r < 0) | |
74 | return log_error_errno(r, "Failed to generate service name: %m"); | |
4dc380d1 | 75 | |
f85fc845 | 76 | return add_symlink("serial-getty@.service", n); |
4dc380d1 LP |
77 | } |
78 | ||
1d97ff7d LP |
79 | static int add_container_getty(const char *tty) { |
80 | _cleanup_free_ char *n = NULL; | |
7410616c | 81 | int r; |
1d97ff7d LP |
82 | |
83 | assert(tty); | |
84 | ||
85 | log_debug("Automatically adding container getty for /dev/pts/%s.", tty); | |
86 | ||
7410616c LP |
87 | r = unit_name_from_path_instance("container-getty", tty, ".service", &n); |
88 | if (r < 0) | |
89 | return log_error_errno(r, "Failed to generate service name: %m"); | |
1d97ff7d LP |
90 | |
91 | return add_symlink("container-getty@.service", n); | |
92 | } | |
93 | ||
54340751 LP |
94 | static int verify_tty(const char *name) { |
95 | _cleanup_close_ int fd = -1; | |
96 | const char *p; | |
97 | ||
98 | /* Some TTYs are weird and have been enumerated but don't work | |
99 | * when you try to use them, such as classic ttyS0 and | |
100 | * friends. Let's check that and open the device and run | |
101 | * isatty() on it. */ | |
102 | ||
63c372cb | 103 | p = strjoina("/dev/", name); |
54340751 LP |
104 | |
105 | /* O_NONBLOCK is essential here, to make sure we don't wait | |
106 | * for DCD */ | |
107 | fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW); | |
108 | if (fd < 0) | |
109 | return -errno; | |
110 | ||
111 | errno = 0; | |
112 | if (isatty(fd) <= 0) | |
113 | return errno ? -errno : -EIO; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
2a796654 | 118 | int main(int argc, char *argv[]) { |
3c20189a LP |
119 | |
120 | static const char virtualization_consoles[] = | |
121 | "hvc0\0" | |
122 | "xvc0\0" | |
07901fc1 HB |
123 | "hvsi0\0" |
124 | "sclp_line0\0" | |
fc6c7fe9 HB |
125 | "ttysclp0\0" |
126 | "3270!tty1\0"; | |
3c20189a | 127 | |
f85fc845 | 128 | _cleanup_free_ char *active = NULL; |
3c20189a | 129 | const char *j; |
1d97ff7d | 130 | int r; |
2a796654 | 131 | |
07719a21 LP |
132 | if (argc > 1 && argc != 4) { |
133 | log_error("This program takes three or no arguments."); | |
2a796654 LP |
134 | return EXIT_FAILURE; |
135 | } | |
136 | ||
07719a21 LP |
137 | if (argc > 1) |
138 | arg_dest = argv[1]; | |
139 | ||
a6903061 | 140 | log_set_target(LOG_TARGET_SAFE); |
2a796654 LP |
141 | log_parse_environment(); |
142 | log_open(); | |
143 | ||
4c12626c LP |
144 | umask(0022); |
145 | ||
75f86906 | 146 | if (detect_container() > 0) { |
1d97ff7d LP |
147 | _cleanup_free_ char *container_ttys = NULL; |
148 | ||
6705c2df | 149 | log_debug("Automatically adding console shell."); |
2a796654 | 150 | |
337eebb9 | 151 | if (add_symlink("console-getty.service", "console-getty.service") < 0) |
f85fc845 | 152 | return EXIT_FAILURE; |
2a796654 | 153 | |
1d97ff7d LP |
154 | /* When $container_ttys is set for PID 1, spawn |
155 | * gettys on all ptys named therein. Note that despite | |
156 | * the variable name we only support ptys here. */ | |
157 | ||
158 | r = getenv_for_pid(1, "container_ttys", &container_ttys); | |
207d1d09 | 159 | if (r > 0) { |
a2a5291b | 160 | const char *word, *state; |
1d97ff7d LP |
161 | size_t l; |
162 | ||
a2a5291b | 163 | FOREACH_WORD(word, l, container_ttys, state) { |
1d97ff7d LP |
164 | const char *t; |
165 | char tty[l + 1]; | |
166 | ||
a2a5291b | 167 | memcpy(tty, word, l); |
1d97ff7d LP |
168 | tty[l] = 0; |
169 | ||
170 | /* First strip off /dev/ if it is specified */ | |
171 | t = path_startswith(tty, "/dev/"); | |
172 | if (!t) | |
173 | t = tty; | |
174 | ||
175 | /* Then, make sure it's actually a pty */ | |
3fa5dd6d | 176 | t = path_startswith(t, "pts/"); |
1d97ff7d LP |
177 | if (!t) |
178 | continue; | |
179 | ||
180 | if (add_container_getty(t) < 0) | |
181 | return EXIT_FAILURE; | |
182 | } | |
183 | } | |
184 | ||
2a796654 | 185 | /* Don't add any further magic if we are in a container */ |
f85fc845 | 186 | return EXIT_SUCCESS; |
2a796654 LP |
187 | } |
188 | ||
189 | if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { | |
a2a5291b | 190 | const char *word, *state; |
39f0570d MM |
191 | size_t l; |
192 | ||
193 | /* Automatically add in a serial getty on all active | |
194 | * kernel consoles */ | |
a2a5291b | 195 | FOREACH_WORD(word, l, active, state) { |
f85fc845 | 196 | _cleanup_free_ char *tty = NULL; |
2a796654 | 197 | |
a2a5291b | 198 | tty = strndup(word, l); |
39f0570d | 199 | if (!tty) { |
f85fc845 LP |
200 | log_oom(); |
201 | return EXIT_FAILURE; | |
39f0570d MM |
202 | } |
203 | ||
f85fc845 | 204 | if (isempty(tty) || tty_is_vc(tty)) |
39f0570d | 205 | continue; |
39f0570d | 206 | |
54340751 LP |
207 | if (verify_tty(tty) < 0) |
208 | continue; | |
209 | ||
2a796654 LP |
210 | /* We assume that gettys on virtual terminals are |
211 | * started via manual configuration and do this magic | |
212 | * only for non-VC terminals. */ | |
213 | ||
f85fc845 LP |
214 | if (add_serial_getty(tty) < 0) |
215 | return EXIT_FAILURE; | |
3c20189a | 216 | } |
2a796654 LP |
217 | } |
218 | ||
219 | /* Automatically add in a serial getty on the first | |
220 | * virtualizer console */ | |
3c20189a | 221 | NULSTR_FOREACH(j, virtualization_consoles) { |
f5650614 | 222 | char *p; |
980fc73d | 223 | |
63c372cb | 224 | p = strjoina("/sys/class/tty/", j); |
f85fc845 | 225 | if (access(p, F_OK) < 0) |
3c20189a | 226 | continue; |
980fc73d | 227 | |
f85fc845 LP |
228 | if (add_serial_getty(j) < 0) |
229 | return EXIT_FAILURE; | |
2a796654 LP |
230 | } |
231 | ||
f85fc845 | 232 | return EXIT_SUCCESS; |
2a796654 | 233 | } |