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663996b3 MS |
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 | |
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 | |
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 | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
60f067b4 | 25 | #include <fcntl.h> |
663996b3 MS |
26 | |
27 | #include "log.h" | |
28 | #include "util.h" | |
29 | #include "mkdir.h" | |
30 | #include "unit-name.h" | |
31 | #include "virt.h" | |
32 | #include "fileio.h" | |
60f067b4 | 33 | #include "path-util.h" |
663996b3 MS |
34 | |
35 | static const char *arg_dest = "/tmp"; | |
36 | ||
37 | static int add_symlink(const char *fservice, const char *tservice) { | |
60f067b4 | 38 | _cleanup_free_ char *from = NULL, *to = NULL; |
663996b3 MS |
39 | int r; |
40 | ||
41 | assert(fservice); | |
42 | assert(tservice); | |
43 | ||
44 | from = strappend(SYSTEM_DATA_UNIT_PATH "/", fservice); | |
60f067b4 JS |
45 | if (!from) |
46 | return log_oom(); | |
663996b3 | 47 | |
60f067b4 JS |
48 | to = strjoin(arg_dest,"/getty.target.wants/", tservice, NULL); |
49 | if (!to) | |
50 | return log_oom(); | |
663996b3 MS |
51 | |
52 | mkdir_parents_label(to, 0755); | |
53 | ||
54 | r = symlink(from, to); | |
55 | if (r < 0) { | |
56 | if (errno == EEXIST) | |
57 | /* In case console=hvc0 is passed this will very likely result in EEXIST */ | |
60f067b4 | 58 | return 0; |
663996b3 MS |
59 | else { |
60 | log_error("Failed to create symlink %s: %m", to); | |
60f067b4 | 61 | return -errno; |
663996b3 MS |
62 | } |
63 | } | |
64 | ||
60f067b4 | 65 | return 0; |
663996b3 MS |
66 | } |
67 | ||
68 | static int add_serial_getty(const char *tty) { | |
60f067b4 | 69 | _cleanup_free_ char *n = NULL; |
663996b3 MS |
70 | |
71 | assert(tty); | |
72 | ||
73 | log_debug("Automatically adding serial getty for /dev/%s.", tty); | |
74 | ||
75 | n = unit_name_replace_instance("serial-getty@.service", tty); | |
76 | if (!n) | |
77 | return log_oom(); | |
78 | ||
60f067b4 JS |
79 | return add_symlink("serial-getty@.service", n); |
80 | } | |
663996b3 | 81 | |
60f067b4 JS |
82 | static int add_container_getty(const char *tty) { |
83 | _cleanup_free_ char *n = NULL; | |
84 | ||
85 | assert(tty); | |
86 | ||
87 | log_debug("Automatically adding container getty for /dev/pts/%s.", tty); | |
88 | ||
89 | n = unit_name_replace_instance("container-getty@.service", tty); | |
90 | if (!n) | |
91 | return log_oom(); | |
92 | ||
93 | return add_symlink("container-getty@.service", n); | |
94 | } | |
95 | ||
96 | static int verify_tty(const char *name) { | |
97 | _cleanup_close_ int fd = -1; | |
98 | const char *p; | |
99 | ||
100 | /* Some TTYs are weird and have been enumerated but don't work | |
101 | * when you try to use them, such as classic ttyS0 and | |
102 | * friends. Let's check that and open the device and run | |
103 | * isatty() on it. */ | |
104 | ||
105 | p = strappenda("/dev/", name); | |
106 | ||
107 | /* O_NONBLOCK is essential here, to make sure we don't wait | |
108 | * for DCD */ | |
109 | fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW); | |
110 | if (fd < 0) | |
111 | return -errno; | |
112 | ||
113 | errno = 0; | |
114 | if (isatty(fd) <= 0) | |
115 | return errno ? -errno : -EIO; | |
116 | ||
117 | return 0; | |
663996b3 MS |
118 | } |
119 | ||
120 | int main(int argc, char *argv[]) { | |
121 | ||
122 | static const char virtualization_consoles[] = | |
123 | "hvc0\0" | |
124 | "xvc0\0" | |
60f067b4 JS |
125 | "hvsi0\0" |
126 | "sclp_line0\0" | |
127 | "ttysclp0\0" | |
128 | "3270!tty1\0"; | |
663996b3 | 129 | |
60f067b4 | 130 | _cleanup_free_ char *active = NULL; |
663996b3 | 131 | const char *j; |
60f067b4 | 132 | int r; |
663996b3 MS |
133 | |
134 | if (argc > 1 && argc != 4) { | |
135 | log_error("This program takes three or no arguments."); | |
136 | return EXIT_FAILURE; | |
137 | } | |
138 | ||
139 | if (argc > 1) | |
140 | arg_dest = argv[1]; | |
141 | ||
142 | log_set_target(LOG_TARGET_SAFE); | |
143 | log_parse_environment(); | |
144 | log_open(); | |
145 | ||
146 | umask(0022); | |
147 | ||
148 | if (detect_container(NULL) > 0) { | |
60f067b4 JS |
149 | _cleanup_free_ char *container_ttys = NULL; |
150 | ||
663996b3 MS |
151 | log_debug("Automatically adding console shell."); |
152 | ||
153 | if (add_symlink("console-getty.service", "console-getty.service") < 0) | |
60f067b4 JS |
154 | return EXIT_FAILURE; |
155 | ||
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); | |
161 | if (r > 0) { | |
162 | char *w, *state; | |
163 | size_t l; | |
164 | ||
165 | FOREACH_WORD(w, l, container_ttys, state) { | |
166 | const char *t; | |
167 | char tty[l + 1]; | |
168 | ||
169 | memcpy(tty, w, l); | |
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 */ | |
178 | t = path_startswith(t, "pts/"); | |
179 | if (!t) | |
180 | continue; | |
181 | ||
182 | if (add_container_getty(t) < 0) | |
183 | return EXIT_FAILURE; | |
184 | } | |
185 | } | |
663996b3 MS |
186 | |
187 | /* Don't add any further magic if we are in a container */ | |
60f067b4 | 188 | return EXIT_SUCCESS; |
663996b3 MS |
189 | } |
190 | ||
191 | if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { | |
14228c0d MB |
192 | char *w, *state; |
193 | size_t l; | |
194 | ||
195 | /* Automatically add in a serial getty on all active | |
196 | * kernel consoles */ | |
197 | FOREACH_WORD(w, l, active, state) { | |
60f067b4 | 198 | _cleanup_free_ char *tty = NULL; |
663996b3 | 199 | |
14228c0d MB |
200 | tty = strndup(w, l); |
201 | if (!tty) { | |
60f067b4 JS |
202 | log_oom(); |
203 | return EXIT_FAILURE; | |
14228c0d MB |
204 | } |
205 | ||
60f067b4 JS |
206 | if (isempty(tty) || tty_is_vc(tty)) |
207 | continue; | |
208 | ||
209 | if (verify_tty(tty) < 0) | |
14228c0d | 210 | continue; |
14228c0d | 211 | |
663996b3 MS |
212 | /* We assume that gettys on virtual terminals are |
213 | * started via manual configuration and do this magic | |
214 | * only for non-VC terminals. */ | |
215 | ||
60f067b4 JS |
216 | if (add_serial_getty(tty) < 0) |
217 | return EXIT_FAILURE; | |
663996b3 MS |
218 | } |
219 | } | |
220 | ||
221 | /* Automatically add in a serial getty on the first | |
222 | * virtualizer console */ | |
223 | NULSTR_FOREACH(j, virtualization_consoles) { | |
60f067b4 | 224 | _cleanup_free_ char *p = NULL; |
663996b3 | 225 | |
60f067b4 JS |
226 | p = strappend("/sys/class/tty/", j); |
227 | if (!p) { | |
663996b3 | 228 | log_oom(); |
60f067b4 | 229 | return EXIT_FAILURE; |
663996b3 MS |
230 | } |
231 | ||
60f067b4 | 232 | if (access(p, F_OK) < 0) |
663996b3 MS |
233 | continue; |
234 | ||
60f067b4 JS |
235 | if (add_serial_getty(j) < 0) |
236 | return EXIT_FAILURE; | |
663996b3 MS |
237 | } |
238 | ||
60f067b4 | 239 | return EXIT_SUCCESS; |
663996b3 | 240 | } |