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52661efd LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
f23c09b0 | 6 | Copyright 2010 Lennart Poettering |
52661efd LP |
7 | |
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <errno.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | #include "util.h" | |
28 | #include "condition.h" | |
29 | ||
267632f0 | 30 | Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) { |
52661efd LP |
31 | Condition *c; |
32 | ||
33 | c = new0(Condition, 1); | |
34 | c->type = type; | |
267632f0 | 35 | c->trigger = trigger; |
52661efd LP |
36 | c->negate = negate; |
37 | ||
d257ddef LP |
38 | if (parameter) |
39 | if (!(c->parameter = strdup(parameter))) { | |
40 | free(c); | |
41 | return NULL; | |
42 | } | |
52661efd LP |
43 | |
44 | return c; | |
45 | } | |
46 | ||
47 | void condition_free(Condition *c) { | |
48 | assert(c); | |
49 | ||
50 | free(c->parameter); | |
51 | free(c); | |
52 | } | |
53 | ||
54 | void condition_free_list(Condition *first) { | |
55 | Condition *c, *n; | |
56 | ||
57 | LIST_FOREACH_SAFE(conditions, c, n, first) | |
58 | condition_free(c); | |
59 | } | |
60 | ||
61 | static bool test_kernel_command_line(const char *parameter) { | |
62 | char *line, *w, *state, *word = NULL; | |
63 | bool equal; | |
64 | int r; | |
65 | size_t l, pl; | |
66 | bool found = false; | |
67 | ||
039655a4 LP |
68 | assert(parameter); |
69 | ||
2fc97846 LP |
70 | if (detect_virtualization(NULL) > 0) |
71 | return false; | |
72 | ||
52661efd LP |
73 | if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) { |
74 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); | |
75 | return false; | |
76 | } | |
77 | ||
78 | equal = !!strchr(parameter, '='); | |
79 | pl = strlen(parameter); | |
80 | ||
81 | FOREACH_WORD_QUOTED(w, l, line, state) { | |
82 | ||
83 | free(word); | |
84 | if (!(word = strndup(w, l))) | |
85 | break; | |
86 | ||
87 | if (equal) { | |
88 | if (streq(word, parameter)) { | |
89 | found = true; | |
90 | break; | |
91 | } | |
92 | } else { | |
93 | if (startswith(word, parameter) && (word[pl] == '=' || word[pl] == 0)) { | |
94 | found = true; | |
95 | break; | |
96 | } | |
97 | } | |
98 | ||
99 | } | |
100 | ||
101 | free(word); | |
102 | free(line); | |
103 | ||
104 | return found; | |
105 | } | |
106 | ||
039655a4 LP |
107 | static bool test_virtualization(const char *parameter) { |
108 | int r, b; | |
109 | const char *id; | |
110 | ||
111 | assert(parameter); | |
112 | ||
113 | if ((r = detect_virtualization(&id)) < 0) { | |
114 | log_warning("Failed to detect virtualization, ignoring: %s", strerror(-r)); | |
115 | return false; | |
116 | } | |
117 | ||
118 | b = parse_boolean(parameter); | |
119 | ||
120 | if (r > 0 && b > 0) | |
121 | return true; | |
122 | ||
123 | if (r == 0 && b == 0) | |
124 | return true; | |
125 | ||
126 | return streq(parameter, id); | |
127 | } | |
128 | ||
52661efd LP |
129 | bool condition_test(Condition *c) { |
130 | assert(c); | |
131 | ||
132 | switch(c->type) { | |
133 | ||
134 | case CONDITION_PATH_EXISTS: | |
135 | return (access(c->parameter, F_OK) >= 0) == !c->negate; | |
136 | ||
36af55d9 LP |
137 | case CONDITION_DIRECTORY_NOT_EMPTY: { |
138 | int k; | |
139 | ||
140 | k = dir_is_empty(c->parameter); | |
141 | return !(k == -ENOENT || k > 0) == !c->negate; | |
142 | } | |
143 | ||
52661efd | 144 | case CONDITION_KERNEL_COMMAND_LINE: |
cb40c15e | 145 | return test_kernel_command_line(c->parameter) == !c->negate; |
52661efd | 146 | |
039655a4 | 147 | case CONDITION_VIRTUALIZATION: |
cb40c15e | 148 | return test_virtualization(c->parameter) == !c->negate; |
039655a4 | 149 | |
d257ddef LP |
150 | case CONDITION_NULL: |
151 | return !c->negate; | |
152 | ||
52661efd LP |
153 | default: |
154 | assert_not_reached("Invalid condition type."); | |
155 | } | |
156 | } | |
157 | ||
158 | bool condition_test_list(Condition *first) { | |
159 | Condition *c; | |
267632f0 | 160 | int triggered = -1; |
52661efd LP |
161 | |
162 | /* If the condition list is empty, then it is true */ | |
163 | if (!first) | |
164 | return true; | |
165 | ||
267632f0 LP |
166 | /* Otherwise, if all of the non-trigger conditions apply and |
167 | * if any of the trigger conditions apply (unless there are | |
168 | * none) we return true */ | |
169 | LIST_FOREACH(conditions, c, first) { | |
170 | bool b; | |
171 | ||
172 | b = condition_test(c); | |
173 | ||
174 | if (!c->trigger && !b) | |
175 | return false; | |
176 | ||
177 | if (c->trigger && triggered <= 0) | |
178 | triggered = b; | |
179 | } | |
52661efd | 180 | |
267632f0 | 181 | return triggered != 0; |
52661efd LP |
182 | } |
183 | ||
184 | void condition_dump(Condition *c, FILE *f, const char *prefix) { | |
185 | assert(c); | |
186 | assert(f); | |
187 | ||
188 | if (!prefix) | |
189 | prefix = ""; | |
190 | ||
191 | fprintf(f, | |
267632f0 | 192 | "%s%s: %s%s%s\n", |
52661efd LP |
193 | prefix, |
194 | condition_type_to_string(c->type), | |
267632f0 | 195 | c->trigger ? "|" : "", |
52661efd LP |
196 | c->negate ? "!" : "", |
197 | c->parameter); | |
198 | } | |
199 | ||
200 | void condition_dump_list(Condition *first, FILE *f, const char *prefix) { | |
201 | Condition *c; | |
202 | ||
203 | LIST_FOREACH(conditions, c, first) | |
204 | condition_dump(c, f, prefix); | |
205 | } | |
206 | ||
207 | static const char* const condition_type_table[_CONDITION_TYPE_MAX] = { | |
208 | [CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine", | |
d257ddef LP |
209 | [CONDITION_PATH_EXISTS] = "ConditionPathExists", |
210 | [CONDITION_NULL] = "ConditionNull" | |
52661efd LP |
211 | }; |
212 | ||
213 | DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType); |