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
47 /* return 0 on everything-is-fine, and non-zero otherwise */
parseconfig(const char * filename,struct GlobalConfig * global)48 int parseconfig(const char *filename, struct GlobalConfig *global)
49 {
50 FILE *file = NULL;
51 bool usedarg = FALSE;
52 int rc = 0;
53 struct OperationConfig *operation = global->last;
54 char *pathalloc = NULL;
55
56 if(!filename) {
57 /* NULL means load .curlrc from homedir! */
58 char *curlrc = findfile(".curlrc", CURLRC_DOTSCORE);
59 if(curlrc) {
60 file = fopen(curlrc, FOPEN_READTEXT);
61 if(!file) {
62 free(curlrc);
63 return 1;
64 }
65 filename = pathalloc = curlrc;
66 }
67 #ifdef _WIN32 /* Windows */
68 else {
69 char *fullp;
70 /* check for .curlrc then _curlrc in the dir of the executable */
71 file = Curl_execpath(".curlrc", &fullp);
72 if(!file)
73 file = Curl_execpath("_curlrc", &fullp);
74 if(file)
75 /* this is the filename we read from */
76 filename = fullp;
77 }
78 #endif
79 }
80 else {
81 if(strcmp(filename, "-"))
82 file = fopen(filename, FOPEN_READTEXT);
83 else
84 file = stdin;
85 }
86
87 if(file) {
88 char *line;
89 char *option;
90 char *param;
91 int lineno = 0;
92 bool dashed_option;
93 struct curlx_dynbuf buf;
94 bool fileerror = FALSE;
95 curlx_dyn_init(&buf, MAX_CONFIG_LINE_LENGTH);
96 DEBUGASSERT(filename);
97
98 while(!rc && my_get_line(file, &buf, &fileerror)) {
99 ParameterError res;
100 bool alloced_param = FALSE;
101 lineno++;
102 line = curlx_dyn_ptr(&buf);
103 if(!line) {
104 rc = 1; /* out of memory */
105 break;
106 }
107
108 /* line with # in the first non-blank column is a comment! */
109 while(*line && ISSPACE(*line))
110 line++;
111
112 switch(*line) {
113 case '#':
114 case '/':
115 case '\r':
116 case '\n':
117 case '*':
118 case '\0':
119 curlx_dyn_reset(&buf);
120 continue;
121 }
122
123 /* the option keywords starts here */
124 option = line;
125
126 /* the option starts with a dash? */
127 dashed_option = (option[0] == '-');
128
129 while(*line && !ISSPACE(*line) && !ISSEP(*line, dashed_option))
130 line++;
131 /* ... and has ended here */
132
133 if(*line)
134 *line++ = '\0'; /* null-terminate, we have a local copy of the data */
135
136 #ifdef DEBUG_CONFIG
137 fprintf(tool_stderr, "GOT: %s\n", option);
138 #endif
139
140 /* pass spaces and separator(s) */
141 while(*line && (ISSPACE(*line) || ISSEP(*line, dashed_option)))
142 line++;
143
144 /* the parameter starts here (unless quoted) */
145 if(*line == '\"') {
146 /* quoted parameter, do the quote dance */
147 line++;
148 param = malloc(strlen(line) + 1); /* parameter */
149 if(!param) {
150 /* out of memory */
151 rc = 1;
152 break;
153 }
154 alloced_param = TRUE;
155 (void)unslashquote(line, param);
156 }
157 else {
158 param = line; /* parameter starts here */
159 while(*line && !ISSPACE(*line))
160 line++;
161
162 if(*line) {
163 *line = '\0'; /* null-terminate */
164
165 /* to detect mistakes better, see if there is data following */
166 line++;
167 /* pass all spaces */
168 while(*line && ISSPACE(*line))
169 line++;
170
171 switch(*line) {
172 case '\0':
173 case '\r':
174 case '\n':
175 case '#': /* comment */
176 break;
177 default:
178 warnf(operation->global, "%s:%d: warning: '%s' uses unquoted "
179 "whitespace", filename, lineno, option);
180 warnf(operation->global, "This may cause side-effects. "
181 "Consider using double quotes?");
182 }
183 }
184 if(!*param)
185 /* do this so getparameter can check for required parameters.
186 Otherwise it always thinks there is a parameter. */
187 param = NULL;
188 }
189
190 #ifdef DEBUG_CONFIG
191 fprintf(tool_stderr, "PARAM: \"%s\"\n",(param ? param : "(null)"));
192 #endif
193 res = getparameter(option, param, NULL, &usedarg, global, operation);
194 operation = global->last;
195
196 if(!res && param && *param && !usedarg)
197 /* we passed in a parameter that was not used! */
198 res = PARAM_GOT_EXTRA_PARAMETER;
199
200 if(res == PARAM_NEXT_OPERATION) {
201 if(operation->url_list && operation->url_list->url) {
202 /* Allocate the next config */
203 operation->next = malloc(sizeof(struct OperationConfig));
204 if(operation->next) {
205 /* Initialise the newly created config */
206 config_init(operation->next);
207
208 /* Set the global config pointer */
209 operation->next->global = global;
210
211 /* Update the last operation pointer */
212 global->last = operation->next;
213
214 /* Move onto the new config */
215 operation->next->prev = operation;
216 operation = operation->next;
217 }
218 else
219 res = PARAM_NO_MEM;
220 }
221 }
222
223 if(res != PARAM_OK && res != PARAM_NEXT_OPERATION) {
224 /* the help request is not really an error */
225 if(!strcmp(filename, "-")) {
226 filename = "<stdin>";
227 }
228 if(res != PARAM_HELP_REQUESTED &&
229 res != PARAM_MANUAL_REQUESTED &&
230 res != PARAM_VERSION_INFO_REQUESTED &&
231 res != PARAM_ENGINES_REQUESTED &&
232 res != PARAM_CA_EMBED_REQUESTED) {
233 const char *reason = param2text(res);
234 errorf(operation->global, "%s:%d: '%s' %s",
235 filename, lineno, option, reason);
236 rc = (int)res;
237 }
238 }
239
240 if(alloced_param)
241 Curl_safefree(param);
242 }
243 curlx_dyn_free(&buf);
244 if(file != stdin)
245 fclose(file);
246 if(fileerror)
247 rc = 1;
248 }
249 else
250 rc = 1; /* could not open the file */
251
252 free(pathalloc);
253 return rc;
254 }
255
256 /*
257 * Copies the string from line to the buffer at param, unquoting
258 * backslash-quoted characters and NUL-terminating the output string.
259 * Stops at the first non-backslash-quoted double quote character or the
260 * end of the input string. param must be at least as long as the input
261 * string. Returns the pointer after the last handled input character.
262 */
unslashquote(const char * line,char * param)263 static const char *unslashquote(const char *line, char *param)
264 {
265 while(*line && (*line != '\"')) {
266 if(*line == '\\') {
267 char out;
268 line++;
269
270 /* default is to output the letter after the backslash */
271 switch(out = *line) {
272 case '\0':
273 continue; /* this'll break out of the loop */
274 case 't':
275 out = '\t';
276 break;
277 case 'n':
278 out = '\n';
279 break;
280 case 'r':
281 out = '\r';
282 break;
283 case 'v':
284 out = '\v';
285 break;
286 }
287 *param++ = out;
288 line++;
289 }
290 else
291 *param++ = *line++;
292 }
293 *param = '\0'; /* always null-terminate */
294 return line;
295 }
296
297 /*
298 * Reads a line from the given file, ensuring is NUL terminated.
299 */
300
my_get_line(FILE * input,struct dynbuf * buf,bool * error)301 bool my_get_line(FILE *input, struct dynbuf *buf, bool *error)
302 {
303 CURLcode result;
304 char buffer[128];
305 curlx_dyn_reset(buf);
306 while(1) {
307 char *b = fgets(buffer, sizeof(buffer), input);
308
309 if(b) {
310 size_t rlen = strlen(b);
311
312 if(!rlen)
313 break;
314
315 result = curlx_dyn_addn(buf, b, rlen);
316 if(result) {
317 /* too long line or out of memory */
318 *error = TRUE;
319 return FALSE; /* error */
320 }
321
322 else if(b[rlen-1] == '\n')
323 /* end of the line */
324 return TRUE; /* all good */
325
326 else if(feof(input)) {
327 /* append a newline */
328 result = curlx_dyn_addn(buf, "\n", 1);
329 if(result) {
330 /* too long line or out of memory */
331 *error = TRUE;
332 return FALSE; /* error */
333 }
334 return TRUE; /* all good */
335 }
336 }
337 else
338 break;
339 }
340 return FALSE;
341 }
342
