/src/curl/lib/dict.c

Source
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/
#include "curl_setup.h"
#include "urldata.h"
#include "dict.h"

#ifndef CURL_DISABLE_DICT

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#elif defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif

#include "transfer.h"
#include "curl_trc.h"
#include "escape.h"

#define DICT_MATCH   "/MATCH:"
#define DICT_MATCH2  "/M:"
#define DICT_MATCH3  "/FIND:"
#define DICT_DEFINE  "/DEFINE:"
#define DICT_DEFINE2 "/D:"
#define DICT_DEFINE3 "/LOOKUP:"


#define DYN_DICT_WORD 10000
static char *unescape_word(const char *input)
{
  struct dynbuf out;
  const char *ptr;
  CURLcode result = CURLE_OK;
  curlx_dyn_init(&out, DYN_DICT_WORD);

  /* According to RFC2229 section 2.2, these letters need to be escaped with
     \[letter] */
  for(ptr = input; *ptr; ptr++) {
    char ch = *ptr;
    if((ch <= 32) || (ch == 127) ||
       (ch == '\'') || (ch == '\"') || (ch == '\\'))
      result = curlx_dyn_addn(&out, "\\", 1);
    if(!result)
      result = curlx_dyn_addn(&out, ptr, 1);
    if(result)
      return NULL;
  }
  return curlx_dyn_ptr(&out);
}

/* sendf() sends formatted data to the server */
static CURLcode sendf(struct Curl_easy *data,
                      const char *fmt, ...) CURL_PRINTF(2, 3);

static CURLcode sendf(struct Curl_easy *data, const char *fmt, ...)
{
  size_t bytes_written;
  size_t write_len;
  CURLcode result = CURLE_OK;
  char *s;
  char *sptr;
  va_list ap;
  va_start(ap, fmt);
  s = curl_mvaprintf(fmt, ap); /* returns an allocated string */
  va_end(ap);
  if(!s)
    return CURLE_OUT_OF_MEMORY; /* failure */

  bytes_written = 0;
  write_len = strlen(s);
  sptr = s;

  for(;;) {
    /* Write the buffer to the socket */
    result = Curl_xfer_send(data, sptr, write_len, FALSE, &bytes_written);

    if(result)
      break;

    Curl_debug(data, CURLINFO_DATA_OUT, sptr, bytes_written);

    if(bytes_written != write_len) {
      /* if not all was written at once, we must advance the pointer, decrease
         the size left and try again! */
      write_len -= bytes_written;
      sptr += bytes_written;
    }
    else
      break;
  }

  curlx_free(s); /* free the output string */

  return result;
}

static CURLcode dict_do(struct Curl_easy *data, bool *done)
{
  char *word;
  char *eword = NULL;
  char *ppath;
  char *database = NULL;
  char *strategy = NULL;
  char *nthdef = NULL; /* This is not part of the protocol, but required
                          by RFC 2229 */
  CURLcode result;

  char *path;

  *done = TRUE; /* unconditionally */

  /* url-decode path before further evaluation */
  result = Curl_urldecode(data->state.up.path, 0, &path, NULL, REJECT_CTRL);
  if(result)
    return result;

  if(curl_strnequal(path, DICT_MATCH, sizeof(DICT_MATCH) - 1) ||
     curl_strnequal(path, DICT_MATCH2, sizeof(DICT_MATCH2) - 1) ||
     curl_strnequal(path, DICT_MATCH3, sizeof(DICT_MATCH3) - 1)) {

    word = strchr(path, ':');
    if(word) {
      word++;
      database = strchr(word, ':');
      if(database) {
        *database++ = (char)0;
        strategy = strchr(database, ':');
        if(strategy) {
          *strategy++ = (char)0;
          nthdef = strchr(strategy, ':');
          if(nthdef) {
            *nthdef = (char)0;
          }
        }
      }
    }

    if(!word || (*word == (char)0)) {
      infof(data, "lookup word is missing");
    }
    eword = unescape_word((!word || (*word == (char)0)) ? "default" : word);
    if(!eword) {
      result = CURLE_OUT_OF_MEMORY;
      goto error;
    }

    result = sendf(data,
                   "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
                   "MATCH "
                   "%s "    /* database */
                   "%s "    /* strategy */
                   "%s\r\n" /* word */
                   "QUIT\r\n",
                   (!database || (*database == (char)0)) ? "!" : database,
                   (!strategy || (*strategy == (char)0)) ? "." : strategy,
                   eword);

    if(result) {
      failf(data, "Failed sending DICT request");
      goto error;
    }
    Curl_xfer_setup_recv(data, FIRSTSOCKET, -1);
  }
  else if(curl_strnequal(path, DICT_DEFINE, sizeof(DICT_DEFINE) - 1) ||
          curl_strnequal(path, DICT_DEFINE2, sizeof(DICT_DEFINE2) - 1) ||
          curl_strnequal(path, DICT_DEFINE3, sizeof(DICT_DEFINE3) - 1)) {

    word = strchr(path, ':');
    if(word) {
      word++;
      database = strchr(word, ':');
      if(database) {
        *database++ = (char)0;
        nthdef = strchr(database, ':');
        if(nthdef) {
          *nthdef = (char)0;
        }
      }
    }

    if(!word || (*word == (char)0)) {
      infof(data, "lookup word is missing");
    }
    eword = unescape_word((!word || (*word == (char)0)) ? "default" : word);
    if(!eword) {
      result = CURLE_OUT_OF_MEMORY;
      goto error;
    }

    result = sendf(data,
                   "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
                   "DEFINE "
                   "%s "     /* database */
                   "%s\r\n"  /* word */
                   "QUIT\r\n",
                   (!database || (*database == (char)0)) ? "!" : database,
                   eword);

    if(result) {
      failf(data, "Failed sending DICT request");
      goto error;
    }
    Curl_xfer_setup_recv(data, FIRSTSOCKET, -1);
  }
  else {

    ppath = strchr(path, '/');
    if(ppath) {
      int i;

      ppath++;
      for(i = 0; ppath[i]; i++) {
        if(ppath[i] == ':')
          ppath[i] = ' ';
      }
      result = sendf(data,
                     "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
                     "%s\r\n"
                     "QUIT\r\n", ppath);
      if(result) {
        failf(data, "Failed sending DICT request");
        goto error;
      }

      Curl_xfer_setup_recv(data, FIRSTSOCKET, -1);
    }
  }

error:
  curlx_free(eword);
  curlx_free(path);
  return result;
}

/*
 * DICT protocol
 */
static const struct Curl_protocol Curl_protocol_dict = {
  ZERO_NULL,                            /* setup_connection */
  dict_do,                              /* do_it */
  ZERO_NULL,                            /* done */
  ZERO_NULL,                            /* do_more */
  ZERO_NULL,                            /* connect_it */
  ZERO_NULL,                            /* connecting */
  ZERO_NULL,                            /* doing */
  ZERO_NULL,                            /* proto_pollset */
  ZERO_NULL,                            /* doing_pollset */
  ZERO_NULL,                            /* domore_pollset */
  ZERO_NULL,                            /* perform_pollset */
  ZERO_NULL,                            /* disconnect */
  ZERO_NULL,                            /* write_resp */
  ZERO_NULL,                            /* write_resp_hd */
  ZERO_NULL,                            /* connection_check */
  ZERO_NULL,                            /* attach connection */
  ZERO_NULL,                            /* follow */
};

#endif /* CURL_DISABLE_DICT */

/*
 * DICT protocol handler.
 */
const struct Curl_scheme Curl_scheme_dict = {
  "dict",                               /* scheme */
#ifdef CURL_DISABLE_DICT
  ZERO_NULL,
#else
  &Curl_protocol_dict,
#endif
  CURLPROTO_DICT,                       /* protocol */
  CURLPROTO_DICT,                       /* family */
  PROTOPT_NONE | PROTOPT_NOURLQUERY,    /* flags */
  PORT_DICT,                            /* defport */
};

Coverage Report

Created: 2026-02-26 06:32

Line	Count	Source
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 "curl_setup.h"
25		#include "urldata.h"
26		#include "dict.h"
27
28		#ifndef CURL_DISABLE_DICT
29
30		#ifdef HAVE_NETINET_IN_H
31		#include <netinet/in.h>
32		#endif
33		#ifdef HAVE_NETDB_H
34		#include <netdb.h>
35		#endif
36		#ifdef HAVE_ARPA_INET_H
37		#include <arpa/inet.h>
38		#endif
39		#ifdef HAVE_NET_IF_H
40		#include <net/if.h>
41		#endif
42		#ifdef HAVE_SYS_IOCTL_H
43		#include <sys/ioctl.h>
44		#endif
45
46		#ifdef HAVE_SYS_PARAM_H
47		#include <sys/param.h>
48		#endif
49
50		#ifdef HAVE_SYS_SELECT_H
51		#include <sys/select.h>
52		#elif defined(HAVE_UNISTD_H)
53		#include <unistd.h>
54		#endif
55
56		#include "transfer.h"
57		#include "curl_trc.h"
58		#include "escape.h"
59
60	0	#define DICT_MATCH "/MATCH:"
61	0	#define DICT_MATCH2 "/M:"
62	0	#define DICT_MATCH3 "/FIND:"
63	0	#define DICT_DEFINE "/DEFINE:"
64	0	#define DICT_DEFINE2 "/D:"
65	0	#define DICT_DEFINE3 "/LOOKUP:"
66
67
68	0	#define DYN_DICT_WORD 10000
69		static char unescape_word(const char input)
70	0	{
71	0	struct dynbuf out;
72	0	const char *ptr;
73	0	CURLcode result = CURLE_OK;
74	0	curlx_dyn_init(&out, DYN_DICT_WORD);
75
76		/* According to RFC2229 section 2.2, these letters need to be escaped with
77		\[letter] */
78	0	for(ptr = input; *ptr; ptr++) {
79	0	char ch = *ptr;
80	0	if((ch <= 32) \|\| (ch == 127) \|\|
81	0	(ch == '\'') \|\| (ch == '\"') \|\| (ch == '\\'))
82	0	result = curlx_dyn_addn(&out, "\\", 1);
83	0	if(!result)
84	0	result = curlx_dyn_addn(&out, ptr, 1);
85	0	if(result)
86	0	return NULL;
87	0	}
88	0	return curlx_dyn_ptr(&out);
89	0	}
90
91		/* sendf() sends formatted data to the server */
92		static CURLcode sendf(struct Curl_easy *data,
93		const char *fmt, ...) CURL_PRINTF(2, 3);
94
95		static CURLcode sendf(struct Curl_easy data, const char fmt, ...)
96	0	{
97	0	size_t bytes_written;
98	0	size_t write_len;
99	0	CURLcode result = CURLE_OK;
100	0	char *s;
101	0	char *sptr;
102	0	va_list ap;
103	0	va_start(ap, fmt);
104	0	s = curl_mvaprintf(fmt, ap); /* returns an allocated string */
105	0	va_end(ap);
106	0	if(!s)
107	0	return CURLE_OUT_OF_MEMORY; /* failure */
108
109	0	bytes_written = 0;
110	0	write_len = strlen(s);
111	0	sptr = s;
112
113	0	for(;;) {
114		/* Write the buffer to the socket */
115	0	result = Curl_xfer_send(data, sptr, write_len, FALSE, &bytes_written);
116
117	0	if(result)
118	0	break;
119
120	0	Curl_debug(data, CURLINFO_DATA_OUT, sptr, bytes_written);
121
122	0	if(bytes_written != write_len) {
123		/* if not all was written at once, we must advance the pointer, decrease
124		the size left and try again! */
125	0	write_len -= bytes_written;
126	0	sptr += bytes_written;
127	0	}
128	0	else
129	0	break;
130	0	}
131
132	0	curlx_free(s); /* free the output string */
133
134	0	return result;
135	0	}
136
137		static CURLcode dict_do(struct Curl_easy data, bool done)
138	0	{
139	0	char *word;
140	0	char *eword = NULL;
141	0	char *ppath;
142	0	char *database = NULL;
143	0	char *strategy = NULL;
144	0	char nthdef = NULL; / This is not part of the protocol, but required
145		by RFC 2229 */
146	0	CURLcode result;
147
148	0	char *path;
149
150	0	done = TRUE; / unconditionally */
151
152		/* url-decode path before further evaluation */
153	0	result = Curl_urldecode(data->state.up.path, 0, &path, NULL, REJECT_CTRL);
154	0	if(result)
155	0	return result;
156
157	0	if(curl_strnequal(path, DICT_MATCH, sizeof(DICT_MATCH) - 1) \|\|
158	0	curl_strnequal(path, DICT_MATCH2, sizeof(DICT_MATCH2) - 1) \|\|
159	0	curl_strnequal(path, DICT_MATCH3, sizeof(DICT_MATCH3) - 1)) {
160
161	0	word = strchr(path, ':');
162	0	if(word) {
163	0	word++;
164	0	database = strchr(word, ':');
165	0	if(database) {
166	0	*database++ = (char)0;
167	0	strategy = strchr(database, ':');
168	0	if(strategy) {
169	0	*strategy++ = (char)0;
170	0	nthdef = strchr(strategy, ':');
171	0	if(nthdef) {
172	0	*nthdef = (char)0;
173	0	}
174	0	}
175	0	}
176	0	}
177
178	0	if(!word \|\| (*word == (char)0)) {
179	0	infof(data, "lookup word is missing");
180	0	}
181	0	eword = unescape_word((!word \|\| (*word == (char)0)) ? "default" : word);
182	0	if(!eword) {
183	0	result = CURLE_OUT_OF_MEMORY;
184	0	goto error;
185	0	}
186
187	0	result = sendf(data,
188	0	"CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
189	0	"MATCH "
190	0	"%s " /* database */
191	0	"%s " /* strategy */
192	0	"%s\r\n" /* word */
193	0	"QUIT\r\n",
194	0	(!database \|\| (*database == (char)0)) ? "!" : database,
195	0	(!strategy \|\| (*strategy == (char)0)) ? "." : strategy,
196	0	eword);
197
198	0	if(result) {
199	0	failf(data, "Failed sending DICT request");
200	0	goto error;
201	0	}
202	0	Curl_xfer_setup_recv(data, FIRSTSOCKET, -1);
203	0	}
204	0	else if(curl_strnequal(path, DICT_DEFINE, sizeof(DICT_DEFINE) - 1) \|\|
205	0	curl_strnequal(path, DICT_DEFINE2, sizeof(DICT_DEFINE2) - 1) \|\|
206	0	curl_strnequal(path, DICT_DEFINE3, sizeof(DICT_DEFINE3) - 1)) {
207
208	0	word = strchr(path, ':');
209	0	if(word) {
210	0	word++;
211	0	database = strchr(word, ':');
212	0	if(database) {
213	0	*database++ = (char)0;
214	0	nthdef = strchr(database, ':');
215	0	if(nthdef) {
216	0	*nthdef = (char)0;
217	0	}
218	0	}
219	0	}
220
221	0	if(!word \|\| (*word == (char)0)) {
222	0	infof(data, "lookup word is missing");
223	0	}
224	0	eword = unescape_word((!word \|\| (*word == (char)0)) ? "default" : word);
225	0	if(!eword) {
226	0	result = CURLE_OUT_OF_MEMORY;
227	0	goto error;
228	0	}
229
230	0	result = sendf(data,
231	0	"CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
232	0	"DEFINE "
233	0	"%s " /* database */
234	0	"%s\r\n" /* word */
235	0	"QUIT\r\n",
236	0	(!database \|\| (*database == (char)0)) ? "!" : database,
237	0	eword);
238
239	0	if(result) {
240	0	failf(data, "Failed sending DICT request");
241	0	goto error;
242	0	}
243	0	Curl_xfer_setup_recv(data, FIRSTSOCKET, -1);
244	0	}
245	0	else {
246
247	0	ppath = strchr(path, '/');
248	0	if(ppath) {
249	0	int i;
250
251	0	ppath++;
252	0	for(i = 0; ppath[i]; i++) {
253	0	if(ppath[i] == ':')
254	0	ppath[i] = ' ';
255	0	}
256	0	result = sendf(data,
257	0	"CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
258	0	"%s\r\n"
259	0	"QUIT\r\n", ppath);
260	0	if(result) {
261	0	failf(data, "Failed sending DICT request");
262	0	goto error;
263	0	}
264
265	0	Curl_xfer_setup_recv(data, FIRSTSOCKET, -1);
266	0	}
267	0	}
268
269	0	error:
270	0	curlx_free(eword);
271	0	curlx_free(path);
272	0	return result;
273	0	}
274
275		/*
276		* DICT protocol
277		*/
278		static const struct Curl_protocol Curl_protocol_dict = {
279		ZERO_NULL, /* setup_connection */
280		dict_do, /* do_it */
281		ZERO_NULL, /* done */
282		ZERO_NULL, /* do_more */
283		ZERO_NULL, /* connect_it */
284		ZERO_NULL, /* connecting */
285		ZERO_NULL, /* doing */
286		ZERO_NULL, /* proto_pollset */
287		ZERO_NULL, /* doing_pollset */
288		ZERO_NULL, /* domore_pollset */
289		ZERO_NULL, /* perform_pollset */
290		ZERO_NULL, /* disconnect */
291		ZERO_NULL, /* write_resp */
292		ZERO_NULL, /* write_resp_hd */
293		ZERO_NULL, /* connection_check */
294		ZERO_NULL, /* attach connection */
295		ZERO_NULL, /* follow */
296		};
297
298		#endif /* CURL_DISABLE_DICT */
299
300		/*
301		* DICT protocol handler.
302		*/
303		const struct Curl_scheme Curl_scheme_dict = {
304		"dict", /* scheme */
305		#ifdef CURL_DISABLE_DICT
306		ZERO_NULL,
307		#else
308		&Curl_protocol_dict,
309		#endif
310		CURLPROTO_DICT, /* protocol */
311		CURLPROTO_DICT, /* family */
312		PROTOPT_NONE \| PROTOPT_NOURLQUERY, /* flags */
313		PORT_DICT, /* defport */
314		};