/***************************************************************************

 *                                  _   _ ____  _

 *  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"

#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 "urldata.h"

#include <curl/curl.h>

#include "transfer.h"

#include "sendf.h"

#include "escape.h"

#include "progress.h"

#include "dict.h"

#include "curl_printf.h"

#include "strcase.h"

#include "curl_memory.h"

/* The last #include file should be: */

#include "memdebug.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:"

/*

 * Forward declarations.

 */

static CURLcode dict_do(struct Curl_easy *data, bool *done);

/*

 * DICT protocol handler.

 */

const struct Curl_handler Curl_handler_dict = {

  "dict",                               /* scheme */

  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_getsock */

  ZERO_NULL,                            /* doing_getsock */

  ZERO_NULL,                            /* domore_getsock */

  ZERO_NULL,                            /* perform_getsock */

  ZERO_NULL,                            /* disconnect */

  ZERO_NULL,                            /* write_resp */

  ZERO_NULL,                            /* write_resp_hd */

  ZERO_NULL,                            /* connection_check */

  ZERO_NULL,                            /* attach connection */

  ZERO_NULL,                            /* follow */

  PORT_DICT,                            /* defport */

  CURLPROTO_DICT,                       /* protocol */

  CURLPROTO_DICT,                       /* family */

  PROTOPT_NONE | PROTOPT_NOURLQUERY     /* flags */

};

#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 = vaprintf(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, (size_t)bytes_written);

    if((size_t)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;

  }

  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(strncasecompare(path, DICT_MATCH, sizeof(DICT_MATCH)-1) ||

     strncasecompare(path, DICT_MATCH2, sizeof(DICT_MATCH2)-1) ||

     strncasecompare(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_setup1(data, CURL_XFER_RECV, -1, FALSE); /* no upload */

  }

  else if(strncasecompare(path, DICT_DEFINE, sizeof(DICT_DEFINE)-1) ||

          strncasecompare(path, DICT_DEFINE2, sizeof(DICT_DEFINE2)-1) ||

          strncasecompare(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_setup1(data, CURL_XFER_RECV, -1, FALSE);

  }

  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_setup1(data, CURL_XFER_RECV, -1, FALSE);

    }

  }

error:

  free(eword);

  free(path);

  return result;

}

#endif /* CURL_DISABLE_DICT */