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84ac7bea LP |
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 | ||
11c3a366 TA |
22 | #include <errno.h> |
23 | #include <stdarg.h> | |
24 | #include <stdbool.h> | |
25 | #include <stddef.h> | |
26 | #include <stdint.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <syslog.h> | |
30 | ||
b5efdb8a | 31 | #include "alloc-util.h" |
4f5dd394 | 32 | #include "escape.h" |
b11d6a7b | 33 | #include "extract-word.h" |
11c3a366 TA |
34 | #include "log.h" |
35 | #include "macro.h" | |
b11d6a7b | 36 | #include "string-util.h" |
84ac7bea | 37 | #include "utf8.h" |
84ac7bea LP |
38 | |
39 | int extract_first_word(const char **p, char **ret, const char *separators, ExtractFlags flags) { | |
40 | _cleanup_free_ char *s = NULL; | |
41 | size_t allocated = 0, sz = 0; | |
b85e1c25 | 42 | char c; |
84ac7bea LP |
43 | int r; |
44 | ||
45 | char quote = 0; /* 0 or ' or " */ | |
46 | bool backslash = false; /* whether we've just seen a backslash */ | |
84ac7bea LP |
47 | |
48 | assert(p); | |
49 | assert(ret); | |
50 | ||
84ac7bea LP |
51 | /* Bail early if called after last value or with no input */ |
52 | if (!*p) | |
53 | goto finish_force_terminate; | |
93de9eb7 | 54 | c = **p; |
84ac7bea | 55 | |
8372da44 FB |
56 | if (!separators) |
57 | separators = WHITESPACE; | |
58 | ||
84ac7bea LP |
59 | /* Parses the first word of a string, and returns it in |
60 | * *ret. Removes all quotes in the process. When parsing fails | |
61 | * (because of an uneven number of quotes or similar), leaves | |
62 | * the pointer *p at the first invalid character. */ | |
63 | ||
b85e1c25 FB |
64 | if (flags & EXTRACT_DONT_COALESCE_SEPARATORS) |
65 | if (!GREEDY_REALLOC(s, allocated, sz+1)) | |
66 | return -ENOMEM; | |
84ac7bea | 67 | |
93de9eb7 | 68 | for (;; (*p) ++, c = **p) { |
b85e1c25 FB |
69 | if (c == 0) |
70 | goto finish_force_terminate; | |
71 | else if (strchr(separators, c)) { | |
93de9eb7 FB |
72 | if (flags & EXTRACT_DONT_COALESCE_SEPARATORS) { |
73 | (*p) ++; | |
b85e1c25 | 74 | goto finish_force_next; |
93de9eb7 | 75 | } |
b85e1c25 | 76 | } else { |
84ac7bea LP |
77 | /* We found a non-blank character, so we will always |
78 | * want to return a string (even if it is empty), | |
79 | * allocate it here. */ | |
80 | if (!GREEDY_REALLOC(s, allocated, sz+1)) | |
81 | return -ENOMEM; | |
b85e1c25 | 82 | break; |
84ac7bea | 83 | } |
b85e1c25 FB |
84 | } |
85 | ||
93de9eb7 | 86 | for (;; (*p) ++, c = **p) { |
84ac7bea LP |
87 | if (backslash) { |
88 | if (!GREEDY_REALLOC(s, allocated, sz+7)) | |
89 | return -ENOMEM; | |
90 | ||
91 | if (c == 0) { | |
92 | if ((flags & EXTRACT_CUNESCAPE_RELAX) && | |
93 | (!quote || flags & EXTRACT_RELAX)) { | |
94 | /* If we find an unquoted trailing backslash and we're in | |
95 | * EXTRACT_CUNESCAPE_RELAX mode, keep it verbatim in the | |
96 | * output. | |
97 | * | |
98 | * Unbalanced quotes will only be allowed in EXTRACT_RELAX | |
99 | * mode, EXTRACT_CUNESCAPE_RELAX mode does not allow them. | |
100 | */ | |
101 | s[sz++] = '\\'; | |
102 | goto finish_force_terminate; | |
103 | } | |
104 | if (flags & EXTRACT_RELAX) | |
105 | goto finish_force_terminate; | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
109 | if (flags & EXTRACT_CUNESCAPE) { | |
dcd12626 | 110 | uint32_t u; |
3565e095 | 111 | bool eight_bit = false; |
84ac7bea | 112 | |
3565e095 | 113 | r = cunescape_one(*p, (size_t) -1, &u, &eight_bit); |
84ac7bea LP |
114 | if (r < 0) { |
115 | if (flags & EXTRACT_CUNESCAPE_RELAX) { | |
116 | s[sz++] = '\\'; | |
117 | s[sz++] = c; | |
3ff13c29 FB |
118 | } else |
119 | return -EINVAL; | |
120 | } else { | |
121 | (*p) += r - 1; | |
122 | ||
3565e095 ZJS |
123 | if (eight_bit) |
124 | s[sz++] = u; | |
3ff13c29 | 125 | else |
3565e095 | 126 | sz += utf8_encode_unichar(s + sz, u); |
84ac7bea | 127 | } |
84ac7bea LP |
128 | } else |
129 | s[sz++] = c; | |
130 | ||
84ac7bea LP |
131 | backslash = false; |
132 | ||
133 | } else if (quote) { /* inside either single or double quotes */ | |
27fc921b FB |
134 | for (;; (*p) ++, c = **p) { |
135 | if (c == 0) { | |
136 | if (flags & EXTRACT_RELAX) | |
137 | goto finish_force_terminate; | |
138 | return -EINVAL; | |
139 | } else if (c == quote) { /* found the end quote */ | |
140 | quote = 0; | |
141 | break; | |
c89f52ac | 142 | } else if (c == '\\' && !(flags & EXTRACT_RETAIN_ESCAPE)) { |
27fc921b FB |
143 | backslash = true; |
144 | break; | |
145 | } else { | |
146 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
147 | return -ENOMEM; | |
84ac7bea | 148 | |
27fc921b FB |
149 | s[sz++] = c; |
150 | } | |
84ac7bea LP |
151 | } |
152 | ||
84ac7bea | 153 | } else { |
27fc921b FB |
154 | for (;; (*p) ++, c = **p) { |
155 | if (c == 0) | |
156 | goto finish_force_terminate; | |
157 | else if ((c == '\'' || c == '"') && (flags & EXTRACT_QUOTES)) { | |
158 | quote = c; | |
159 | break; | |
c89f52ac | 160 | } else if (c == '\\' && !(flags & EXTRACT_RETAIN_ESCAPE)) { |
27fc921b FB |
161 | backslash = true; |
162 | break; | |
163 | } else if (strchr(separators, c)) { | |
164 | if (flags & EXTRACT_DONT_COALESCE_SEPARATORS) { | |
165 | (*p) ++; | |
166 | goto finish_force_next; | |
167 | } | |
0247447e FB |
168 | /* Skip additional coalesced separators. */ |
169 | for (;; (*p) ++, c = **p) { | |
170 | if (c == 0) | |
171 | goto finish_force_terminate; | |
172 | if (!strchr(separators, c)) | |
173 | break; | |
174 | } | |
175 | goto finish; | |
176 | ||
27fc921b FB |
177 | } else { |
178 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
179 | return -ENOMEM; | |
84ac7bea | 180 | |
27fc921b FB |
181 | s[sz++] = c; |
182 | } | |
84ac7bea LP |
183 | } |
184 | } | |
84ac7bea LP |
185 | } |
186 | ||
187 | finish_force_terminate: | |
188 | *p = NULL; | |
189 | finish: | |
190 | if (!s) { | |
191 | *p = NULL; | |
192 | *ret = NULL; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | finish_force_next: | |
197 | s[sz] = 0; | |
198 | *ret = s; | |
199 | s = NULL; | |
200 | ||
201 | return 1; | |
202 | } | |
203 | ||
204 | int extract_first_word_and_warn( | |
205 | const char **p, | |
206 | char **ret, | |
207 | const char *separators, | |
208 | ExtractFlags flags, | |
209 | const char *unit, | |
210 | const char *filename, | |
211 | unsigned line, | |
212 | const char *rvalue) { | |
213 | ||
dea7b6b0 LP |
214 | /* Try to unquote it, if it fails, warn about it and try again |
215 | * but this time using EXTRACT_CUNESCAPE_RELAX to keep the | |
216 | * backslashes verbatim in invalid escape sequences. */ | |
217 | ||
84ac7bea LP |
218 | const char *save; |
219 | int r; | |
220 | ||
221 | save = *p; | |
222 | r = extract_first_word(p, ret, separators, flags); | |
dea7b6b0 LP |
223 | if (r >= 0) |
224 | return r; | |
225 | ||
226 | if (r == -EINVAL && !(flags & EXTRACT_CUNESCAPE_RELAX)) { | |
84ac7bea LP |
227 | |
228 | /* Retry it with EXTRACT_CUNESCAPE_RELAX. */ | |
229 | *p = save; | |
230 | r = extract_first_word(p, ret, separators, flags|EXTRACT_CUNESCAPE_RELAX); | |
dea7b6b0 LP |
231 | if (r >= 0) { |
232 | /* It worked this time, hence it must have been an invalid escape sequence we could correct. */ | |
233 | log_syntax(unit, LOG_WARNING, filename, line, EINVAL, "Invalid escape sequences in line, correcting: \"%s\"", rvalue); | |
234 | return r; | |
235 | } | |
236 | ||
237 | /* If it's still EINVAL; then it must be unbalanced quoting, report this. */ | |
238 | if (r == -EINVAL) | |
239 | return log_syntax(unit, LOG_ERR, filename, line, r, "Unbalanced quoting, ignoring: \"%s\"", rvalue); | |
84ac7bea LP |
240 | } |
241 | ||
dea7b6b0 LP |
242 | /* Can be any error, report it */ |
243 | return log_syntax(unit, LOG_ERR, filename, line, r, "Unable to decode word \"%s\", ignoring: %m", rvalue); | |
84ac7bea LP |
244 | } |
245 | ||
246 | int extract_many_words(const char **p, const char *separators, ExtractFlags flags, ...) { | |
247 | va_list ap; | |
248 | char **l; | |
249 | int n = 0, i, c, r; | |
250 | ||
251 | /* Parses a number of words from a string, stripping any | |
252 | * quotes if necessary. */ | |
253 | ||
254 | assert(p); | |
255 | ||
256 | /* Count how many words are expected */ | |
257 | va_start(ap, flags); | |
258 | for (;;) { | |
259 | if (!va_arg(ap, char **)) | |
260 | break; | |
261 | n++; | |
262 | } | |
263 | va_end(ap); | |
264 | ||
265 | if (n <= 0) | |
266 | return 0; | |
267 | ||
268 | /* Read all words into a temporary array */ | |
269 | l = newa0(char*, n); | |
270 | for (c = 0; c < n; c++) { | |
271 | ||
272 | r = extract_first_word(p, &l[c], separators, flags); | |
273 | if (r < 0) { | |
274 | int j; | |
275 | ||
276 | for (j = 0; j < c; j++) | |
277 | free(l[j]); | |
278 | ||
279 | return r; | |
280 | } | |
281 | ||
282 | if (r == 0) | |
283 | break; | |
284 | } | |
285 | ||
286 | /* If we managed to parse all words, return them in the passed | |
287 | * in parameters */ | |
288 | va_start(ap, flags); | |
289 | for (i = 0; i < n; i++) { | |
290 | char **v; | |
291 | ||
292 | v = va_arg(ap, char **); | |
293 | assert(v); | |
294 | ||
295 | *v = l[i]; | |
296 | } | |
297 | va_end(ap); | |
298 | ||
299 | return c; | |
300 | } |