1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 #include "tool_setup.h"
25
26 #include "curlx.h"
27
28 #include "tool_cfgable.h"
29 #include "tool_getparam.h"
30 #include "tool_helpers.h"
31 #include "tool_findfile.h"
32 #include "tool_msgs.h"
33 #include "tool_parsecfg.h"
34 #include "tool_util.h"
35 #include "dynbuf.h"
36
37 #include "memdebug.h" /* keep this as LAST include */
38
39 /* only acknowledge colon or equals as separators if the option was not
40 specified with an initial dash! */
41 #define ISSEP(x,dash) (!dash && (((x) == '=') || ((x) == ':')))
42
43 static const char *unslashquote(const char *line, char *param);
44
45 #define MAX_CONFIG_LINE_LENGTH (10*1024*1024)
46 static bool my_get_line(FILE *fp, struct curlx_dynbuf *, bool *error);
47
48
49 /* return 0 on everything-is-fine, and non-zero otherwise */
parseconfig(const char * filename,struct GlobalConfig * global)50 int parseconfig(const char *filename, struct GlobalConfig *global)
51 {
52 FILE *file = NULL;
53 bool usedarg = FALSE;
54 int rc = 0;
55 struct OperationConfig *operation = global->last;
56 char *pathalloc = NULL;
57
58 if(!filename) {
59 /* NULL means load .curlrc from homedir! */
60 char *curlrc = findfile(".curlrc", CURLRC_DOTSCORE);
61 if(curlrc) {
62 file = fopen(curlrc, FOPEN_READTEXT);
63 if(!file) {
64 free(curlrc);
65 return 1;
66 }
67 filename = pathalloc = curlrc;
68 }
69 #ifdef _WIN32 /* Windows */
70 else {
71 char *fullp;
72 /* check for .curlrc then _curlrc in the dir of the executable */
73 file = Curl_execpath(".curlrc", &fullp);
74 if(!file)
75 file = Curl_execpath("_curlrc", &fullp);
76 if(file)
77 /* this is the filename we read from */
78 filename = fullp;
79 }
80 #endif
81 }
82 else {
83 if(strcmp(filename, "-"))
84 file = fopen(filename, FOPEN_READTEXT);
85 else
86 file = stdin;
87 }
88
89 if(file) {
90 char *line;
91 char *option;
92 char *param;
93 int lineno = 0;
94 bool dashed_option;
95 struct curlx_dynbuf buf;
96 bool fileerror = FALSE;
97 curlx_dyn_init(&buf, MAX_CONFIG_LINE_LENGTH);
98 DEBUGASSERT(filename);
99
100 while(!rc && my_get_line(file, &buf, &fileerror)) {
101 ParameterError res;
102 bool alloced_param = FALSE;
103 lineno++;
104 line = curlx_dyn_ptr(&buf);
105 if(!line) {
106 rc = 1; /* out of memory */
107 break;
108 }
109
110 /* line with # in the first non-blank column is a comment! */
111 while(*line && ISSPACE(*line))
112 line++;
113
114 switch(*line) {
115 case '#':
116 case '/':
117 case '\r':
118 case '\n':
119 case '*':
120 case '\0':
121 curlx_dyn_reset(&buf);
122 continue;
123 }
124
125 /* the option keywords starts here */
126 option = line;
127
128 /* the option starts with a dash? */
129 dashed_option = (option[0] == '-') ? TRUE : FALSE;
130
131 while(*line && !ISSPACE(*line) && !ISSEP(*line, dashed_option))
132 line++;
133 /* ... and has ended here */
134
135 if(*line)
136 *line++ = '\0'; /* null-terminate, we have a local copy of the data */
137
138 #ifdef DEBUG_CONFIG
139 fprintf(tool_stderr, "GOT: %s\n", option);
140 #endif
141
142 /* pass spaces and separator(s) */
143 while(*line && (ISSPACE(*line) || ISSEP(*line, dashed_option)))
144 line++;
145
146 /* the parameter starts here (unless quoted) */
147 if(*line == '\"') {
148 /* quoted parameter, do the quote dance */
149 line++;
150 param = malloc(strlen(line) + 1); /* parameter */
151 if(!param) {
152 /* out of memory */
153 rc = 1;
154 break;
155 }
156 alloced_param = TRUE;
157 (void)unslashquote(line, param);
158 }
159 else {
160 param = line; /* parameter starts here */
161 while(*line && !ISSPACE(*line))
162 line++;
163
164 if(*line) {
165 *line = '\0'; /* null-terminate */
166
167 /* to detect mistakes better, see if there is data following */
168 line++;
169 /* pass all spaces */
170 while(*line && ISSPACE(*line))
171 line++;
172
173 switch(*line) {
174 case '\0':
175 case '\r':
176 case '\n':
177 case '#': /* comment */
178 break;
179 default:
180 warnf(operation->global, "%s:%d: warning: '%s' uses unquoted "
181 "whitespace", filename, lineno, option);
182 warnf(operation->global, "This may cause side-effects. "
183 "Consider using double quotes?");
184 }
185 }
186 if(!*param)
187 /* do this so getparameter can check for required parameters.
188 Otherwise it always thinks there is a parameter. */
189 param = NULL;
190 }
191
192 #ifdef DEBUG_CONFIG
193 fprintf(tool_stderr, "PARAM: \"%s\"\n",(param ? param : "(null)"));
194 #endif
195 res = getparameter(option, param, NULL, &usedarg, global, operation);
196 operation = global->last;
197
198 if(!res && param && *param && !usedarg)
199 /* we passed in a parameter that was not used! */
200 res = PARAM_GOT_EXTRA_PARAMETER;
201
202 if(res == PARAM_NEXT_OPERATION) {
203 if(operation->url_list && operation->url_list->url) {
204 /* Allocate the next config */
205 operation->next = malloc(sizeof(struct OperationConfig));
206 if(operation->next) {
207 /* Initialise the newly created config */
208 config_init(operation->next);
209
210 /* Set the global config pointer */
211 operation->next->global = global;
212
213 /* Update the last operation pointer */
214 global->last = operation->next;
215
216 /* Move onto the new config */
217 operation->next->prev = operation;
218 operation = operation->next;
219 }
220 else
221 res = PARAM_NO_MEM;
222 }
223 }
224
225 if(res != PARAM_OK && res != PARAM_NEXT_OPERATION) {
226 /* the help request is not really an error */
227 if(!strcmp(filename, "-")) {
228 filename = "<stdin>";
229 }
230 if(res != PARAM_HELP_REQUESTED &&
231 res != PARAM_MANUAL_REQUESTED &&
232 res != PARAM_VERSION_INFO_REQUESTED &&
233 res != PARAM_ENGINES_REQUESTED &&
234 res != PARAM_CA_EMBED_REQUESTED) {
235 const char *reason = param2text(res);
236 errorf(operation->global, "%s:%d: '%s' %s",
237 filename, lineno, option, reason);
238 rc = (int)res;
239 }
240 }
241
242 if(alloced_param)
243 Curl_safefree(param);
244
245 curlx_dyn_reset(&buf);
246 }
247 curlx_dyn_free(&buf);
248 if(file != stdin)
249 fclose(file);
250 if(fileerror)
251 rc = 1;
252 }
253 else
254 rc = 1; /* could not open the file */
255
256 free(pathalloc);
257 return rc;
258 }
259
260 /*
261 * Copies the string from line to the buffer at param, unquoting
262 * backslash-quoted characters and NUL-terminating the output string.
263 * Stops at the first non-backslash-quoted double quote character or the
264 * end of the input string. param must be at least as long as the input
265 * string. Returns the pointer after the last handled input character.
266 */
unslashquote(const char * line,char * param)267 static const char *unslashquote(const char *line, char *param)
268 {
269 while(*line && (*line != '\"')) {
270 if(*line == '\\') {
271 char out;
272 line++;
273
274 /* default is to output the letter after the backslash */
275 switch(out = *line) {
276 case '\0':
277 continue; /* this'll break out of the loop */
278 case 't':
279 out = '\t';
280 break;
281 case 'n':
282 out = '\n';
283 break;
284 case 'r':
285 out = '\r';
286 break;
287 case 'v':
288 out = '\v';
289 break;
290 }
291 *param++ = out;
292 line++;
293 }
294 else
295 *param++ = *line++;
296 }
297 *param = '\0'; /* always null-terminate */
298 return line;
299 }
300
301 /*
302 * Reads a line from the given file, ensuring is NUL terminated.
303 */
my_get_line(FILE * fp,struct curlx_dynbuf * db,bool * error)304 static bool my_get_line(FILE *fp, struct curlx_dynbuf *db,
305 bool *error)
306 {
307 char buf[4096];
308 *error = FALSE;
309 do {
310 /* fgets() returns s on success, and NULL on error or when end of file
311 occurs while no characters have been read. */
312 if(!fgets(buf, sizeof(buf), fp))
313 /* only if there is data in the line, return TRUE */
314 return curlx_dyn_len(db) ? TRUE : FALSE;
315 if(curlx_dyn_add(db, buf)) {
316 *error = TRUE; /* error */
317 return FALSE; /* stop reading */
318 }
319 } while(!strchr(buf, '\n'));
320
321 return TRUE; /* continue */
322 }
323
