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4e731273 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 TA |
20 | #include <stdbool.h> |
21 | #include <stddef.h> | |
22 | #include <string.h> | |
23 | ||
b5efdb8a | 24 | #include "alloc-util.h" |
4e731273 LP |
25 | #include "extract-word.h" |
26 | #include "fileio.h" | |
27 | #include "macro.h" | |
28 | #include "parse-util.h" | |
29 | #include "proc-cmdline.h" | |
30 | #include "process-util.h" | |
c573dcfe | 31 | #include "special.h" |
4e731273 LP |
32 | #include "string-util.h" |
33 | #include "util.h" | |
34 | #include "virt.h" | |
35 | ||
36 | int proc_cmdline(char **ret) { | |
37 | assert(ret); | |
38 | ||
39 | if (detect_container() > 0) | |
40 | return get_process_cmdline(1, 0, false, ret); | |
41 | else | |
42 | return read_one_line_file("/proc/cmdline", ret); | |
43 | } | |
44 | ||
d7f69e16 ZJS |
45 | int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value, void *data), |
46 | void *data, | |
47 | bool strip_prefix) { | |
4e731273 LP |
48 | _cleanup_free_ char *line = NULL; |
49 | const char *p; | |
50 | int r; | |
51 | ||
52 | assert(parse_item); | |
53 | ||
54 | r = proc_cmdline(&line); | |
55 | if (r < 0) | |
56 | return r; | |
57 | ||
58 | p = line; | |
59 | for (;;) { | |
60 | _cleanup_free_ char *word = NULL; | |
d7f69e16 | 61 | char *value = NULL, *unprefixed; |
4e731273 LP |
62 | |
63 | r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX); | |
64 | if (r < 0) | |
65 | return r; | |
66 | if (r == 0) | |
67 | break; | |
68 | ||
69 | /* Filter out arguments that are intended only for the | |
70 | * initrd */ | |
d7f69e16 ZJS |
71 | unprefixed = startswith(word, "rd."); |
72 | if (unprefixed && !in_initrd()) | |
4e731273 LP |
73 | continue; |
74 | ||
75 | value = strchr(word, '='); | |
76 | if (value) | |
77 | *(value++) = 0; | |
78 | ||
d7f69e16 | 79 | r = parse_item(strip_prefix && unprefixed ? unprefixed : word, value, data); |
4e731273 LP |
80 | if (r < 0) |
81 | return r; | |
82 | } | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | int get_proc_cmdline_key(const char *key, char **value) { | |
88 | _cleanup_free_ char *line = NULL, *ret = NULL; | |
89 | bool found = false; | |
90 | const char *p; | |
91 | int r; | |
92 | ||
93 | assert(key); | |
94 | ||
95 | r = proc_cmdline(&line); | |
96 | if (r < 0) | |
97 | return r; | |
98 | ||
99 | p = line; | |
100 | for (;;) { | |
101 | _cleanup_free_ char *word = NULL; | |
102 | const char *e; | |
103 | ||
104 | r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX); | |
105 | if (r < 0) | |
106 | return r; | |
107 | if (r == 0) | |
108 | break; | |
109 | ||
110 | /* Filter out arguments that are intended only for the | |
111 | * initrd */ | |
112 | if (!in_initrd() && startswith(word, "rd.")) | |
113 | continue; | |
114 | ||
115 | if (value) { | |
116 | e = startswith(word, key); | |
117 | if (!e) | |
118 | continue; | |
119 | ||
120 | r = free_and_strdup(&ret, e); | |
121 | if (r < 0) | |
122 | return r; | |
123 | ||
124 | found = true; | |
125 | } else { | |
126 | if (streq(word, key)) | |
127 | found = true; | |
128 | } | |
129 | } | |
130 | ||
131 | if (value) { | |
132 | *value = ret; | |
133 | ret = NULL; | |
134 | } | |
135 | ||
136 | return found; | |
137 | ||
138 | } | |
139 | ||
140 | int shall_restore_state(void) { | |
141 | _cleanup_free_ char *value = NULL; | |
142 | int r; | |
143 | ||
144 | r = get_proc_cmdline_key("systemd.restore_state=", &value); | |
145 | if (r < 0) | |
146 | return r; | |
147 | if (r == 0) | |
148 | return true; | |
149 | ||
934ae16b | 150 | return parse_boolean(value); |
4e731273 | 151 | } |
c573dcfe EV |
152 | |
153 | static const char * const rlmap[] = { | |
154 | "emergency", SPECIAL_EMERGENCY_TARGET, | |
155 | "-b", SPECIAL_EMERGENCY_TARGET, | |
156 | "rescue", SPECIAL_RESCUE_TARGET, | |
157 | "single", SPECIAL_RESCUE_TARGET, | |
158 | "-s", SPECIAL_RESCUE_TARGET, | |
159 | "s", SPECIAL_RESCUE_TARGET, | |
160 | "S", SPECIAL_RESCUE_TARGET, | |
161 | "1", SPECIAL_RESCUE_TARGET, | |
162 | "2", SPECIAL_MULTI_USER_TARGET, | |
163 | "3", SPECIAL_MULTI_USER_TARGET, | |
164 | "4", SPECIAL_MULTI_USER_TARGET, | |
165 | "5", SPECIAL_GRAPHICAL_TARGET, | |
dcd61450 IS |
166 | NULL |
167 | }; | |
168 | ||
169 | static const char * const rlmap_initrd[] = { | |
170 | "emergency", SPECIAL_EMERGENCY_TARGET, | |
171 | "rescue", SPECIAL_RESCUE_TARGET, | |
172 | NULL | |
c573dcfe EV |
173 | }; |
174 | ||
175 | const char* runlevel_to_target(const char *word) { | |
176 | size_t i; | |
dcd61450 IS |
177 | const char * const *rlmap_ptr = in_initrd() ? rlmap_initrd |
178 | : rlmap; | |
c573dcfe EV |
179 | |
180 | if (!word) | |
181 | return NULL; | |
182 | ||
dcd61450 IS |
183 | if (in_initrd() && (word = startswith(word, "rd.")) == NULL) |
184 | return NULL; | |
185 | ||
186 | for (i = 0; rlmap_ptr[i] != NULL; i += 2) | |
187 | if (streq(word, rlmap_ptr[i])) | |
188 | return rlmap_ptr[i+1]; | |
c573dcfe EV |
189 | |
190 | return NULL; | |
191 | } |