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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> | |
25 | ||
26 | #include "log.h" | |
27 | #include "util.h" | |
28 | #include "mkdir.h" | |
29 | #include "unit-name.h" | |
30 | #include "virt.h" | |
31 | #include "fileio.h" | |
32 | #include "path-util.h" | |
33 | ||
34 | static const char *arg_dest = "/tmp"; | |
35 | ||
36 | static int add_symlink(const char *fservice, const char *tservice) { | |
37 | _cleanup_free_ char *from = NULL, *to = NULL; | |
38 | int r; | |
39 | ||
40 | assert(fservice); | |
41 | assert(tservice); | |
42 | ||
43 | from = strappend(SYSTEM_DATA_UNIT_PATH "/", fservice); | |
44 | if (!from) | |
45 | return log_oom(); | |
46 | ||
47 | to = strjoin(arg_dest,"/getty.target.wants/", tservice, NULL); | |
48 | if (!to) | |
49 | return log_oom(); | |
50 | ||
51 | mkdir_parents_label(to, 0755); | |
52 | ||
53 | r = symlink(from, to); | |
54 | if (r < 0) { | |
55 | if (errno == EEXIST) | |
56 | /* In case console=hvc0 is passed this will very likely result in EEXIST */ | |
57 | return 0; | |
58 | else { | |
59 | log_error("Failed to create symlink %s: %m", to); | |
60 | return -errno; | |
61 | } | |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static int add_serial_getty(const char *tty) { | |
68 | _cleanup_free_ char *n = NULL; | |
69 | ||
70 | assert(tty); | |
71 | ||
72 | log_debug("Automatically adding serial getty for /dev/%s.", tty); | |
73 | ||
74 | n = unit_name_replace_instance("serial-getty@.service", tty); | |
75 | if (!n) | |
76 | return log_oom(); | |
77 | ||
78 | return add_symlink("serial-getty@.service", n); | |
79 | } | |
80 | ||
81 | static int add_container_getty(const char *tty) { | |
82 | _cleanup_free_ char *n = NULL; | |
83 | ||
84 | assert(tty); | |
85 | ||
86 | log_debug("Automatically adding container getty for /dev/pts/%s.", tty); | |
87 | ||
88 | n = unit_name_replace_instance("container-getty@.service", tty); | |
89 | if (!n) | |
90 | return log_oom(); | |
91 | ||
92 | return add_symlink("container-getty@.service", n); | |
93 | } | |
94 | ||
95 | int main(int argc, char *argv[]) { | |
96 | ||
97 | static const char virtualization_consoles[] = | |
98 | "hvc0\0" | |
99 | "xvc0\0" | |
100 | "hvsi0\0"; | |
101 | ||
102 | _cleanup_free_ char *active = NULL; | |
103 | const char *j; | |
104 | int r; | |
105 | ||
106 | if (argc > 1 && argc != 4) { | |
107 | log_error("This program takes three or no arguments."); | |
108 | return EXIT_FAILURE; | |
109 | } | |
110 | ||
111 | if (argc > 1) | |
112 | arg_dest = argv[1]; | |
113 | ||
114 | log_set_target(LOG_TARGET_SAFE); | |
115 | log_parse_environment(); | |
116 | log_open(); | |
117 | ||
118 | umask(0022); | |
119 | ||
120 | if (detect_container(NULL) > 0) { | |
121 | _cleanup_free_ char *container_ttys = NULL; | |
122 | ||
123 | log_debug("Automatically adding console shell."); | |
124 | ||
125 | if (add_symlink("console-getty.service", "console-getty.service") < 0) | |
126 | return EXIT_FAILURE; | |
127 | ||
128 | /* When $container_ttys is set for PID 1, spawn | |
129 | * gettys on all ptys named therein. Note that despite | |
130 | * the variable name we only support ptys here. */ | |
131 | ||
132 | r = getenv_for_pid(1, "container_ttys", &container_ttys); | |
133 | if (r > 0) { | |
134 | char *w, *state; | |
135 | size_t l; | |
136 | ||
137 | FOREACH_WORD(w, l, container_ttys, state) { | |
138 | const char *t; | |
139 | char tty[l + 1]; | |
140 | ||
141 | memcpy(tty, w, l); | |
142 | tty[l] = 0; | |
143 | ||
144 | /* First strip off /dev/ if it is specified */ | |
145 | t = path_startswith(tty, "/dev/"); | |
146 | if (!t) | |
147 | t = tty; | |
148 | ||
149 | /* Then, make sure it's actually a pty */ | |
150 | t = path_startswith(tty, "pts/"); | |
151 | if (!t) | |
152 | continue; | |
153 | ||
154 | if (add_container_getty(t) < 0) | |
155 | return EXIT_FAILURE; | |
156 | } | |
157 | } | |
158 | ||
159 | /* Don't add any further magic if we are in a container */ | |
160 | return EXIT_SUCCESS; | |
161 | } | |
162 | ||
163 | if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { | |
164 | char *w, *state; | |
165 | size_t l; | |
166 | ||
167 | /* Automatically add in a serial getty on all active | |
168 | * kernel consoles */ | |
169 | FOREACH_WORD(w, l, active, state) { | |
170 | _cleanup_free_ char *tty = NULL; | |
171 | ||
172 | tty = strndup(w, l); | |
173 | if (!tty) { | |
174 | log_oom(); | |
175 | return EXIT_FAILURE; | |
176 | } | |
177 | ||
178 | if (isempty(tty) || tty_is_vc(tty)) | |
179 | continue; | |
180 | ||
181 | /* We assume that gettys on virtual terminals are | |
182 | * started via manual configuration and do this magic | |
183 | * only for non-VC terminals. */ | |
184 | ||
185 | if (add_serial_getty(tty) < 0) | |
186 | return EXIT_FAILURE; | |
187 | } | |
188 | } | |
189 | ||
190 | /* Automatically add in a serial getty on the first | |
191 | * virtualizer console */ | |
192 | NULSTR_FOREACH(j, virtualization_consoles) { | |
193 | _cleanup_free_ char *p = NULL; | |
194 | ||
195 | p = strappend("/sys/class/tty/", j); | |
196 | if (!p) { | |
197 | log_oom(); | |
198 | return EXIT_FAILURE; | |
199 | } | |
200 | ||
201 | if (access(p, F_OK) < 0) | |
202 | continue; | |
203 | ||
204 | if (add_serial_getty(j) < 0) | |
205 | return EXIT_FAILURE; | |
206 | } | |
207 | ||
208 | return EXIT_SUCCESS; | |
209 | } |