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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2a796654 | 2 | |
2a796654 | 3 | #include <errno.h> |
54340751 | 4 | #include <fcntl.h> |
07630cea LP |
5 | #include <string.h> |
6 | #include <unistd.h> | |
2a796654 | 7 | |
b5efdb8a | 8 | #include "alloc-util.h" |
3ffd4af2 | 9 | #include "fd-util.h" |
07630cea | 10 | #include "fileio.h" |
afe44c8f | 11 | #include "generator.h" |
2a796654 | 12 | #include "log.h" |
49e942b2 | 13 | #include "mkdir.h" |
1d97ff7d | 14 | #include "path-util.h" |
0b452006 | 15 | #include "process-util.h" |
9d22f97b | 16 | #include "strv.h" |
288a74cc | 17 | #include "terminal-util.h" |
07630cea LP |
18 | #include "unit-name.h" |
19 | #include "util.h" | |
20 | #include "virt.h" | |
2a796654 | 21 | |
9d22f97b | 22 | static const char *arg_dest = NULL; |
2a796654 LP |
23 | |
24 | static int add_symlink(const char *fservice, const char *tservice) { | |
f5650614 | 25 | char *from, *to; |
2a796654 LP |
26 | int r; |
27 | ||
4dc380d1 LP |
28 | assert(fservice); |
29 | assert(tservice); | |
30 | ||
63c372cb LP |
31 | from = strjoina(SYSTEM_DATA_UNIT_PATH "/", fservice); |
32 | to = strjoina(arg_dest, "/getty.target.wants/", tservice); | |
2a796654 | 33 | |
d2e54fae | 34 | mkdir_parents_label(to, 0755); |
2a796654 | 35 | |
a17b785b LP |
36 | r = symlink(from, to); |
37 | if (r < 0) { | |
7410616c | 38 | /* In case console=hvc0 is passed this will very likely result in EEXIST */ |
a17b785b | 39 | if (errno == EEXIST) |
f85fc845 | 40 | return 0; |
7410616c LP |
41 | |
42 | return log_error_errno(errno, "Failed to create symlink %s: %m", to); | |
2a796654 LP |
43 | } |
44 | ||
f85fc845 | 45 | return 0; |
2a796654 LP |
46 | } |
47 | ||
4dc380d1 | 48 | static int add_serial_getty(const char *tty) { |
f85fc845 | 49 | _cleanup_free_ char *n = NULL; |
7410616c | 50 | int r; |
4dc380d1 LP |
51 | |
52 | assert(tty); | |
53 | ||
54 | log_debug("Automatically adding serial getty for /dev/%s.", tty); | |
55 | ||
7410616c LP |
56 | r = unit_name_from_path_instance("serial-getty", tty, ".service", &n); |
57 | if (r < 0) | |
58 | return log_error_errno(r, "Failed to generate service name: %m"); | |
4dc380d1 | 59 | |
f85fc845 | 60 | return add_symlink("serial-getty@.service", n); |
4dc380d1 LP |
61 | } |
62 | ||
1d97ff7d LP |
63 | static int add_container_getty(const char *tty) { |
64 | _cleanup_free_ char *n = NULL; | |
7410616c | 65 | int r; |
1d97ff7d LP |
66 | |
67 | assert(tty); | |
68 | ||
69 | log_debug("Automatically adding container getty for /dev/pts/%s.", tty); | |
70 | ||
7410616c LP |
71 | r = unit_name_from_path_instance("container-getty", tty, ".service", &n); |
72 | if (r < 0) | |
73 | return log_error_errno(r, "Failed to generate service name: %m"); | |
1d97ff7d LP |
74 | |
75 | return add_symlink("container-getty@.service", n); | |
76 | } | |
77 | ||
54340751 LP |
78 | static int verify_tty(const char *name) { |
79 | _cleanup_close_ int fd = -1; | |
80 | const char *p; | |
81 | ||
82 | /* Some TTYs are weird and have been enumerated but don't work | |
83 | * when you try to use them, such as classic ttyS0 and | |
84 | * friends. Let's check that and open the device and run | |
85 | * isatty() on it. */ | |
86 | ||
63c372cb | 87 | p = strjoina("/dev/", name); |
54340751 LP |
88 | |
89 | /* O_NONBLOCK is essential here, to make sure we don't wait | |
90 | * for DCD */ | |
91 | fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW); | |
92 | if (fd < 0) | |
93 | return -errno; | |
94 | ||
95 | errno = 0; | |
96 | if (isatty(fd) <= 0) | |
f5e5c28f | 97 | return errno > 0 ? -errno : -EIO; |
54340751 LP |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
9d22f97b | 102 | static int run(const char *dest, const char *dest_early, const char *dest_late) { |
f85fc845 | 103 | _cleanup_free_ char *active = NULL; |
3c20189a | 104 | const char *j; |
1d97ff7d | 105 | int r; |
2a796654 | 106 | |
9d22f97b | 107 | assert_se(arg_dest = dest); |
07719a21 | 108 | |
75f86906 | 109 | if (detect_container() > 0) { |
1d97ff7d LP |
110 | _cleanup_free_ char *container_ttys = NULL; |
111 | ||
6705c2df | 112 | log_debug("Automatically adding console shell."); |
2a796654 | 113 | |
9d22f97b ZJS |
114 | r = add_symlink("console-getty.service", "console-getty.service"); |
115 | if (r < 0) | |
116 | return r; | |
2a796654 | 117 | |
1d97ff7d LP |
118 | /* When $container_ttys is set for PID 1, spawn |
119 | * gettys on all ptys named therein. Note that despite | |
120 | * the variable name we only support ptys here. */ | |
121 | ||
122 | r = getenv_for_pid(1, "container_ttys", &container_ttys); | |
207d1d09 | 123 | if (r > 0) { |
a2a5291b | 124 | const char *word, *state; |
1d97ff7d LP |
125 | size_t l; |
126 | ||
a2a5291b | 127 | FOREACH_WORD(word, l, container_ttys, state) { |
1d97ff7d LP |
128 | const char *t; |
129 | char tty[l + 1]; | |
130 | ||
a2a5291b | 131 | memcpy(tty, word, l); |
1d97ff7d LP |
132 | tty[l] = 0; |
133 | ||
134 | /* First strip off /dev/ if it is specified */ | |
135 | t = path_startswith(tty, "/dev/"); | |
136 | if (!t) | |
137 | t = tty; | |
138 | ||
139 | /* Then, make sure it's actually a pty */ | |
3fa5dd6d | 140 | t = path_startswith(t, "pts/"); |
1d97ff7d LP |
141 | if (!t) |
142 | continue; | |
143 | ||
9d22f97b ZJS |
144 | r = add_container_getty(t); |
145 | if (r < 0) | |
146 | return r; | |
1d97ff7d LP |
147 | } |
148 | } | |
149 | ||
2a796654 | 150 | /* Don't add any further magic if we are in a container */ |
9d22f97b | 151 | return 0; |
2a796654 LP |
152 | } |
153 | ||
154 | if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { | |
a2a5291b | 155 | const char *word, *state; |
39f0570d MM |
156 | size_t l; |
157 | ||
158 | /* Automatically add in a serial getty on all active | |
159 | * kernel consoles */ | |
a2a5291b | 160 | FOREACH_WORD(word, l, active, state) { |
f85fc845 | 161 | _cleanup_free_ char *tty = NULL; |
2a796654 | 162 | |
a2a5291b | 163 | tty = strndup(word, l); |
9d22f97b ZJS |
164 | if (!tty) |
165 | return log_oom(); | |
39f0570d | 166 | |
54194afb AJ |
167 | /* We assume that gettys on virtual terminals are |
168 | * started via manual configuration and do this magic | |
169 | * only for non-VC terminals. */ | |
170 | ||
f85fc845 | 171 | if (isempty(tty) || tty_is_vc(tty)) |
39f0570d | 172 | continue; |
39f0570d | 173 | |
54340751 LP |
174 | if (verify_tty(tty) < 0) |
175 | continue; | |
176 | ||
9d22f97b ZJS |
177 | r = add_serial_getty(tty); |
178 | if (r < 0) | |
179 | return r; | |
3c20189a | 180 | } |
2a796654 LP |
181 | } |
182 | ||
183 | /* Automatically add in a serial getty on the first | |
184 | * virtualizer console */ | |
9d22f97b ZJS |
185 | FOREACH_STRING(j, |
186 | "hvc0", | |
187 | "xvc0", | |
188 | "hvsi0", | |
189 | "sclp_line0", | |
190 | "ttysclp0", | |
191 | "3270!tty1") { | |
6d946490 | 192 | _cleanup_free_ char *p = NULL; |
980fc73d | 193 | |
6d946490 YW |
194 | p = path_join("/sys/class/tty", j); |
195 | if (!p) | |
196 | return -ENOMEM; | |
f85fc845 | 197 | if (access(p, F_OK) < 0) |
3c20189a | 198 | continue; |
980fc73d | 199 | |
9d22f97b ZJS |
200 | r = add_serial_getty(j); |
201 | if (r < 0) | |
202 | return r; | |
2a796654 LP |
203 | } |
204 | ||
9d22f97b | 205 | return 0; |
2a796654 | 206 | } |
9d22f97b ZJS |
207 | |
208 | DEFINE_MAIN_GENERATOR_FUNCTION(run); |