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
25 #include "curl_setup.h"
26
27 #ifndef CURL_DISABLE_DICT
28
29 #ifdef HAVE_NETINET_IN_H
30 #include <netinet/in.h>
31 #endif
32 #ifdef HAVE_NETDB_H
33 #include <netdb.h>
34 #endif
35 #ifdef HAVE_ARPA_INET_H
36 #include <arpa/inet.h>
37 #endif
38 #ifdef HAVE_NET_IF_H
39 #include <net/if.h>
40 #endif
41 #ifdef HAVE_SYS_IOCTL_H
42 #include <sys/ioctl.h>
43 #endif
44
45 #ifdef HAVE_SYS_PARAM_H
46 #include <sys/param.h>
47 #endif
48
49 #ifdef HAVE_SYS_SELECT_H
50 #include <sys/select.h>
51 #elif defined(HAVE_UNISTD_H)
52 #include <unistd.h>
53 #endif
54
55 #include "urldata.h"
56 #include <curl/curl.h>
57 #include "transfer.h"
58 #include "sendf.h"
59 #include "escape.h"
60 #include "progress.h"
61 #include "dict.h"
62 #include "curl_printf.h"
63 #include "strcase.h"
64 #include "curl_memory.h"
65 /* The last #include file should be: */
66 #include "memdebug.h"
67
68 /*
69 * Forward declarations.
70 */
71
72 static CURLcode dict_do(struct Curl_easy *data, bool *done);
73
74 /*
75 * DICT protocol handler.
76 */
77
78 const struct Curl_handler Curl_handler_dict = {
79 "dict", /* scheme */
80 ZERO_NULL, /* setup_connection */
81 dict_do, /* do_it */
82 ZERO_NULL, /* done */
83 ZERO_NULL, /* do_more */
84 ZERO_NULL, /* connect_it */
85 ZERO_NULL, /* connecting */
86 ZERO_NULL, /* doing */
87 ZERO_NULL, /* proto_getsock */
88 ZERO_NULL, /* doing_getsock */
89 ZERO_NULL, /* domore_getsock */
90 ZERO_NULL, /* perform_getsock */
91 ZERO_NULL, /* disconnect */
92 ZERO_NULL, /* write_resp */
93 ZERO_NULL, /* write_resp_hd */
94 ZERO_NULL, /* connection_check */
95 ZERO_NULL, /* attach connection */
96 ZERO_NULL, /* follow */
97 PORT_DICT, /* defport */
98 CURLPROTO_DICT, /* protocol */
99 CURLPROTO_DICT, /* family */
100 PROTOPT_NONE | PROTOPT_NOURLQUERY /* flags */
101 };
102
103 #define DYN_DICT_WORD 10000
unescape_word(const char * input)104 static char *unescape_word(const char *input)
105 {
106 struct dynbuf out;
107 const char *ptr;
108 CURLcode result = CURLE_OK;
109 Curl_dyn_init(&out, DYN_DICT_WORD);
110
111 /* According to RFC2229 section 2.2, these letters need to be escaped with
112 \[letter] */
113 for(ptr = input; *ptr; ptr++) {
114 char ch = *ptr;
115 if((ch <= 32) || (ch == 127) ||
116 (ch == '\'') || (ch == '\"') || (ch == '\\'))
117 result = Curl_dyn_addn(&out, "\\", 1);
118 if(!result)
119 result = Curl_dyn_addn(&out, ptr, 1);
120 if(result)
121 return NULL;
122 }
123 return Curl_dyn_ptr(&out);
124 }
125
126 /* sendf() sends formatted data to the server */
127 static CURLcode sendf(struct Curl_easy *data,
128 const char *fmt, ...) CURL_PRINTF(2, 3);
129
sendf(struct Curl_easy * data,const char * fmt,...)130 static CURLcode sendf(struct Curl_easy *data, const char *fmt, ...)
131 {
132 size_t bytes_written;
133 size_t write_len;
134 CURLcode result = CURLE_OK;
135 char *s;
136 char *sptr;
137 va_list ap;
138 va_start(ap, fmt);
139 s = vaprintf(fmt, ap); /* returns an allocated string */
140 va_end(ap);
141 if(!s)
142 return CURLE_OUT_OF_MEMORY; /* failure */
143
144 bytes_written = 0;
145 write_len = strlen(s);
146 sptr = s;
147
148 for(;;) {
149 /* Write the buffer to the socket */
150 result = Curl_xfer_send(data, sptr, write_len, FALSE, &bytes_written);
151
152 if(result)
153 break;
154
155 Curl_debug(data, CURLINFO_DATA_OUT, sptr, (size_t)bytes_written);
156
157 if((size_t)bytes_written != write_len) {
158 /* if not all was written at once, we must advance the pointer, decrease
159 the size left and try again! */
160 write_len -= bytes_written;
161 sptr += bytes_written;
162 }
163 else
164 break;
165 }
166
167 free(s); /* free the output string */
168
169 return result;
170 }
171
dict_do(struct Curl_easy * data,bool * done)172 static CURLcode dict_do(struct Curl_easy *data, bool *done)
173 {
174 char *word;
175 char *eword = NULL;
176 char *ppath;
177 char *database = NULL;
178 char *strategy = NULL;
179 char *nthdef = NULL; /* This is not part of the protocol, but required
180 by RFC 2229 */
181 CURLcode result;
182
183 char *path;
184
185 *done = TRUE; /* unconditionally */
186
187 /* url-decode path before further evaluation */
188 result = Curl_urldecode(data->state.up.path, 0, &path, NULL, REJECT_CTRL);
189 if(result)
190 return result;
191
192 if(strncasecompare(path, DICT_MATCH, sizeof(DICT_MATCH)-1) ||
193 strncasecompare(path, DICT_MATCH2, sizeof(DICT_MATCH2)-1) ||
194 strncasecompare(path, DICT_MATCH3, sizeof(DICT_MATCH3)-1)) {
195
196 word = strchr(path, ':');
197 if(word) {
198 word++;
199 database = strchr(word, ':');
200 if(database) {
201 *database++ = (char)0;
202 strategy = strchr(database, ':');
203 if(strategy) {
204 *strategy++ = (char)0;
205 nthdef = strchr(strategy, ':');
206 if(nthdef) {
207 *nthdef = (char)0;
208 }
209 }
210 }
211 }
212
213 if(!word || (*word == (char)0)) {
214 infof(data, "lookup word is missing");
215 word = (char *)"default";
216 }
217 if(!database || (*database == (char)0)) {
218 database = (char *)"!";
219 }
220 if(!strategy || (*strategy == (char)0)) {
221 strategy = (char *)".";
222 }
223
224 eword = unescape_word(word);
225 if(!eword) {
226 result = CURLE_OUT_OF_MEMORY;
227 goto error;
228 }
229
230 result = sendf(data,
231 "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
232 "MATCH "
233 "%s " /* database */
234 "%s " /* strategy */
235 "%s\r\n" /* word */
236 "QUIT\r\n",
237 database,
238 strategy,
239 eword);
240
241 if(result) {
242 failf(data, "Failed sending DICT request");
243 goto error;
244 }
245 Curl_xfer_setup1(data, CURL_XFER_RECV, -1, FALSE); /* no upload */
246 }
247 else if(strncasecompare(path, DICT_DEFINE, sizeof(DICT_DEFINE)-1) ||
248 strncasecompare(path, DICT_DEFINE2, sizeof(DICT_DEFINE2)-1) ||
249 strncasecompare(path, DICT_DEFINE3, sizeof(DICT_DEFINE3)-1)) {
250
251 word = strchr(path, ':');
252 if(word) {
253 word++;
254 database = strchr(word, ':');
255 if(database) {
256 *database++ = (char)0;
257 nthdef = strchr(database, ':');
258 if(nthdef) {
259 *nthdef = (char)0;
260 }
261 }
262 }
263
264 if(!word || (*word == (char)0)) {
265 infof(data, "lookup word is missing");
266 word = (char *)"default";
267 }
268 if(!database || (*database == (char)0)) {
269 database = (char *)"!";
270 }
271
272 eword = unescape_word(word);
273 if(!eword) {
274 result = CURLE_OUT_OF_MEMORY;
275 goto error;
276 }
277
278 result = sendf(data,
279 "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
280 "DEFINE "
281 "%s " /* database */
282 "%s\r\n" /* word */
283 "QUIT\r\n",
284 database,
285 eword);
286
287 if(result) {
288 failf(data, "Failed sending DICT request");
289 goto error;
290 }
291 Curl_xfer_setup1(data, CURL_XFER_RECV, -1, FALSE);
292 }
293 else {
294
295 ppath = strchr(path, '/');
296 if(ppath) {
297 int i;
298
299 ppath++;
300 for(i = 0; ppath[i]; i++) {
301 if(ppath[i] == ':')
302 ppath[i] = ' ';
303 }
304 result = sendf(data,
305 "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
306 "%s\r\n"
307 "QUIT\r\n", ppath);
308 if(result) {
309 failf(data, "Failed sending DICT request");
310 goto error;
311 }
312
313 Curl_xfer_setup1(data, CURL_XFER_RECV, -1, FALSE);
314 }
315 }
316
317 error:
318 free(eword);
319 free(path);
320 return result;
321 }
322 #endif /* CURL_DISABLE_DICT */
323