1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2020, 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.haxx.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 ***************************************************************************/
22 #include "tool_setup.h"
23
24 #define ENABLE_CURLX_PRINTF
25 /* use our own printf() functions */
26 #include "curlx.h"
27
28 #include "tool_cfgable.h"
29 #include "tool_getparam.h"
30 #include "tool_helpers.h"
31 #include "tool_homedir.h"
32 #include "tool_msgs.h"
33 #include "tool_parsecfg.h"
34 #include "dynbuf.h"
35
36 #include "memdebug.h" /* keep this as LAST include */
37
38 /* only acknowledge colon or equals as separators if the option was not
39 specified with an initial dash! */
40 #define ISSEP(x,dash) (!dash && (((x) == '=') || ((x) == ':')))
41
42 static const char *unslashquote(const char *line, char *param);
43
44 #define MAX_CONFIG_LINE_LENGTH (100*1024)
45 static bool my_get_line(FILE *fp, struct curlx_dynbuf *, bool *error);
46
47 #ifdef WIN32
execpath(const char * filename)48 static FILE *execpath(const char *filename)
49 {
50 char filebuffer[512];
51 /* Get the filename of our executable. GetModuleFileName is already declared
52 * via inclusions done in setup header file. We assume that we are using
53 * the ASCII version here.
54 */
55 unsigned long len = GetModuleFileNameA(0, filebuffer, sizeof(filebuffer));
56 if(len > 0 && len < sizeof(filebuffer)) {
57 /* We got a valid filename - get the directory part */
58 char *lastdirchar = strrchr(filebuffer, '\\');
59 if(lastdirchar) {
60 size_t remaining;
61 *lastdirchar = 0;
62 /* If we have enough space, build the RC filename */
63 remaining = sizeof(filebuffer) - strlen(filebuffer);
64 if(strlen(filename) < remaining - 1) {
65 msnprintf(lastdirchar, remaining, "%s%s", DIR_CHAR, filename);
66 return fopen(filebuffer, FOPEN_READTEXT);
67 }
68 }
69 }
70
71 return NULL;
72 }
73 #endif
74
75
76 /* return 0 on everything-is-fine, and non-zero otherwise */
parseconfig(const char * filename,struct GlobalConfig * global)77 int parseconfig(const char *filename, struct GlobalConfig *global)
78 {
79 FILE *file = NULL;
80 bool usedarg = FALSE;
81 int rc = 0;
82 struct OperationConfig *operation = global->last;
83 char *pathalloc = NULL;
84
85 if(!filename || !*filename) {
86 /* NULL or no file name attempts to load .curlrc from the homedir! */
87
88 char *home = homedir(".curlrc");
89 #ifndef WIN32
90 if(home) {
91 pathalloc = curl_maprintf("%s%s.curlrc", home, DIR_CHAR);
92 if(!pathalloc) {
93 free(home);
94 return 1; /* out of memory */
95 }
96 filename = pathalloc;
97 }
98 #else /* Windows */
99 if(home) {
100 int i = 0;
101 char prefix = '.';
102 do {
103 /* if it was allocated in a previous attempt */
104 curl_free(pathalloc);
105 /* check for .curlrc then _curlrc in the home dir */
106 pathalloc = curl_maprintf("%s%s%ccurlrc", home, DIR_CHAR, prefix);
107 if(!pathalloc) {
108 free(home);
109 return 1; /* out of memory */
110 }
111
112 /* Check if the file exists - if not, try _curlrc */
113 file = fopen(pathalloc, FOPEN_READTEXT);
114 if(file) {
115 filename = pathalloc;
116 break;
117 }
118 prefix = '_';
119 } while(++i < 2);
120 }
121 if(!filename) {
122 /* check for .curlrc then _curlrc in the dir of the executable */
123 file = execpath(".curlrc");
124 if(!file)
125 file = execpath("_curlrc");
126 }
127 #endif
128
129 Curl_safefree(home); /* we've used it, now free it */
130 }
131
132 if(!file && filename) { /* no need to fopen() again */
133 if(strcmp(filename, "-"))
134 file = fopen(filename, FOPEN_READTEXT);
135 else
136 file = stdin;
137 }
138
139 if(file) {
140 char *line;
141 char *option;
142 char *param;
143 int lineno = 0;
144 bool dashed_option;
145 struct curlx_dynbuf buf;
146 bool fileerror;
147 curlx_dyn_init(&buf, MAX_CONFIG_LINE_LENGTH);
148
149 while(my_get_line(file, &buf, &fileerror)) {
150 int res;
151 bool alloced_param = FALSE;
152 lineno++;
153 line = curlx_dyn_ptr(&buf);
154 if(!line) {
155 rc = 1; /* out of memory */
156 break;
157 }
158
159 /* line with # in the first non-blank column is a comment! */
160 while(*line && ISSPACE(*line))
161 line++;
162
163 switch(*line) {
164 case '#':
165 case '/':
166 case '\r':
167 case '\n':
168 case '*':
169 case '\0':
170 curlx_dyn_reset(&buf);
171 continue;
172 }
173
174 /* the option keywords starts here */
175 option = line;
176
177 /* the option starts with a dash? */
178 dashed_option = option[0]=='-'?TRUE:FALSE;
179
180 while(*line && !ISSPACE(*line) && !ISSEP(*line, dashed_option))
181 line++;
182 /* ... and has ended here */
183
184 if(*line)
185 *line++ = '\0'; /* null-terminate, we have a local copy of the data */
186
187 #ifdef DEBUG_CONFIG
188 fprintf(stderr, "GOT: %s\n", option);
189 #endif
190
191 /* pass spaces and separator(s) */
192 while(*line && (ISSPACE(*line) || ISSEP(*line, dashed_option)))
193 line++;
194
195 /* the parameter starts here (unless quoted) */
196 if(*line == '\"') {
197 /* quoted parameter, do the quote dance */
198 line++;
199 param = malloc(strlen(line) + 1); /* parameter */
200 if(!param) {
201 /* out of memory */
202 rc = 1;
203 break;
204 }
205 alloced_param = TRUE;
206 (void)unslashquote(line, param);
207 }
208 else {
209 param = line; /* parameter starts here */
210 while(*line && !ISSPACE(*line))
211 line++;
212
213 if(*line) {
214 *line = '\0'; /* null-terminate */
215
216 /* to detect mistakes better, see if there's data following */
217 line++;
218 /* pass all spaces */
219 while(*line && ISSPACE(*line))
220 line++;
221
222 switch(*line) {
223 case '\0':
224 case '\r':
225 case '\n':
226 case '#': /* comment */
227 break;
228 default:
229 warnf(operation->global, "%s:%d: warning: '%s' uses unquoted "
230 "whitespace in the line that may cause side-effects!\n",
231 filename, lineno, option);
232 }
233 }
234 if(!*param)
235 /* do this so getparameter can check for required parameters.
236 Otherwise it always thinks there's a parameter. */
237 param = NULL;
238 }
239
240 #ifdef DEBUG_CONFIG
241 fprintf(stderr, "PARAM: \"%s\"\n",(param ? param : "(null)"));
242 #endif
243 res = getparameter(option, param, &usedarg, global, operation);
244 operation = global->last;
245
246 if(!res && param && *param && !usedarg)
247 /* we passed in a parameter that wasn't used! */
248 res = PARAM_GOT_EXTRA_PARAMETER;
249
250 if(res == PARAM_NEXT_OPERATION) {
251 if(operation->url_list && operation->url_list->url) {
252 /* Allocate the next config */
253 operation->next = malloc(sizeof(struct OperationConfig));
254 if(operation->next) {
255 /* Initialise the newly created config */
256 config_init(operation->next);
257
258 /* Set the global config pointer */
259 operation->next->global = global;
260
261 /* Update the last operation pointer */
262 global->last = operation->next;
263
264 /* Move onto the new config */
265 operation->next->prev = operation;
266 operation = operation->next;
267 }
268 else
269 res = PARAM_NO_MEM;
270 }
271 }
272
273 if(res != PARAM_OK && res != PARAM_NEXT_OPERATION) {
274 /* the help request isn't really an error */
275 if(!strcmp(filename, "-")) {
276 filename = "<stdin>";
277 }
278 if(res != PARAM_HELP_REQUESTED &&
279 res != PARAM_MANUAL_REQUESTED &&
280 res != PARAM_VERSION_INFO_REQUESTED &&
281 res != PARAM_ENGINES_REQUESTED) {
282 const char *reason = param2text(res);
283 warnf(operation->global, "%s:%d: warning: '%s' %s\n",
284 filename, lineno, option, reason);
285 }
286 }
287
288 if(alloced_param)
289 Curl_safefree(param);
290
291 curlx_dyn_reset(&buf);
292 }
293 curlx_dyn_free(&buf);
294 if(file != stdin)
295 fclose(file);
296 if(fileerror)
297 rc = 1;
298 }
299 else
300 rc = 1; /* couldn't open the file */
301
302 curl_free(pathalloc);
303 return rc;
304 }
305
306 /*
307 * Copies the string from line to the buffer at param, unquoting
308 * backslash-quoted characters and NUL-terminating the output string.
309 * Stops at the first non-backslash-quoted double quote character or the
310 * end of the input string. param must be at least as long as the input
311 * string. Returns the pointer after the last handled input character.
312 */
unslashquote(const char * line,char * param)313 static const char *unslashquote(const char *line, char *param)
314 {
315 while(*line && (*line != '\"')) {
316 if(*line == '\\') {
317 char out;
318 line++;
319
320 /* default is to output the letter after the backslash */
321 switch(out = *line) {
322 case '\0':
323 continue; /* this'll break out of the loop */
324 case 't':
325 out = '\t';
326 break;
327 case 'n':
328 out = '\n';
329 break;
330 case 'r':
331 out = '\r';
332 break;
333 case 'v':
334 out = '\v';
335 break;
336 }
337 *param++ = out;
338 line++;
339 }
340 else
341 *param++ = *line++;
342 }
343 *param = '\0'; /* always null-terminate */
344 return line;
345 }
346
347 /*
348 * Reads a line from the given file, ensuring is NUL terminated.
349 */
my_get_line(FILE * fp,struct curlx_dynbuf * db,bool * error)350 static bool my_get_line(FILE *fp, struct curlx_dynbuf *db,
351 bool *error)
352 {
353 char buf[4096];
354 *error = FALSE;
355 do {
356 /* fgets() returns s on success, and NULL on error or when end of file
357 occurs while no characters have been read. */
358 if(!fgets(buf, sizeof(buf), fp))
359 /* only if there's data in the line, return TRUE */
360 return curlx_dyn_len(db) ? TRUE : FALSE;
361 if(curlx_dyn_add(db, buf)) {
362 *error = TRUE; /* error */
363 return FALSE; /* stop reading */
364 }
365 } while(!strchr(buf, '\n'));
366
367 return TRUE; /* continue */
368 }
369