| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | * SPDX-License-Identifier: curl
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include "curl_setup.h"
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| 26 |
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| 27 | #ifndef CURL_DISABLE_DICT
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| 28 |
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| 29 | #ifdef HAVE_NETINET_IN_H
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| 30 | #include <netinet/in.h>
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| 31 | #endif
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| 32 | #ifdef HAVE_NETDB_H
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| 33 | #include <netdb.h>
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| 34 | #endif
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| 35 | #ifdef HAVE_ARPA_INET_H
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| 36 | #include <arpa/inet.h>
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| 37 | #endif
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| 38 | #ifdef HAVE_NET_IF_H
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| 39 | #include <net/if.h>
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| 40 | #endif
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| 41 | #ifdef HAVE_SYS_IOCTL_H
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| 42 | #include <sys/ioctl.h>
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| 43 | #endif
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| 44 |
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| 45 | #ifdef HAVE_SYS_PARAM_H
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| 46 | #include <sys/param.h>
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| 47 | #endif
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| 48 |
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| 49 | #ifdef HAVE_SYS_SELECT_H
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| 50 | #include <sys/select.h>
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| 51 | #elif defined(HAVE_UNISTD_H)
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| 52 | #include <unistd.h>
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| 53 | #endif
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| 54 |
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| 55 | #include "urldata.h"
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| 56 | #include <curl/curl.h>
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| 57 | #include "transfer.h"
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| 58 | #include "sendf.h"
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| 59 | #include "escape.h"
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| 60 | #include "progress.h"
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| 61 | #include "dict.h"
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| 62 | #include "curl_printf.h"
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| 63 | #include "strcase.h"
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| 64 | #include "curl_memory.h"
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| 65 | /* The last #include file should be: */
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| 66 | #include "memdebug.h"
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| 67 |
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| 68 | /*
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| 69 | * Forward declarations.
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| 70 | */
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| 71 |
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| 72 | static CURLcode dict_do(struct Curl_easy *data, bool *done);
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| 73 |
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| 74 | /*
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| 75 | * DICT protocol handler.
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| 76 | */
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| 77 |
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| 78 | const struct Curl_handler Curl_handler_dict = {
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| 79 | "DICT", /* scheme */
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| 80 | ZERO_NULL, /* setup_connection */
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| 81 | dict_do, /* do_it */
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| 82 | ZERO_NULL, /* done */
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| 83 | ZERO_NULL, /* do_more */
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| 84 | ZERO_NULL, /* connect_it */
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| 85 | ZERO_NULL, /* connecting */
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| 86 | ZERO_NULL, /* doing */
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| 87 | ZERO_NULL, /* proto_getsock */
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| 88 | ZERO_NULL, /* doing_getsock */
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| 89 | ZERO_NULL, /* domore_getsock */
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| 90 | ZERO_NULL, /* perform_getsock */
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| 91 | ZERO_NULL, /* disconnect */
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| 92 | ZERO_NULL, /* readwrite */
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| 93 | ZERO_NULL, /* connection_check */
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| 94 | ZERO_NULL, /* attach connection */
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| 95 | PORT_DICT, /* defport */
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| 96 | CURLPROTO_DICT, /* protocol */
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| 97 | CURLPROTO_DICT, /* family */
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| 98 | PROTOPT_NONE | PROTOPT_NOURLQUERY /* flags */
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| 99 | };
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| 100 |
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| 101 | static char *unescape_word(const char *inputbuff)
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| 102 | {
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| 103 | char *newp = NULL;
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| 104 | char *dictp;
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| 105 | size_t len;
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| 106 |
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| 107 | CURLcode result = Curl_urldecode(inputbuff, 0, &newp, &len,
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| 108 | REJECT_NADA);
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| 109 | if(!newp || result)
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| 110 | return NULL;
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| 111 |
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| 112 | dictp = malloc(len*2 + 1); /* add one for terminating zero */
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| 113 | if(dictp) {
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| 114 | char *ptr;
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| 115 | char ch;
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| 116 | int olen = 0;
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| 117 | /* According to RFC2229 section 2.2, these letters need to be escaped with
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| 118 | \[letter] */
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| 119 | for(ptr = newp;
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| 120 | (ch = *ptr) != 0;
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| 121 | ptr++) {
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| 122 | if((ch <= 32) || (ch == 127) ||
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| 123 | (ch == '\'') || (ch == '\"') || (ch == '\\')) {
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| 124 | dictp[olen++] = '\\';
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| 125 | }
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| 126 | dictp[olen++] = ch;
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| 127 | }
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| 128 | dictp[olen] = 0;
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| 129 | }
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| 130 | free(newp);
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| 131 | return dictp;
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| 132 | }
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| 133 |
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| 134 | /* sendf() sends formatted data to the server */
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| 135 | static CURLcode sendf(curl_socket_t sockfd, struct Curl_easy *data,
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| 136 | const char *fmt, ...)
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| 137 | {
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| 138 | ssize_t bytes_written;
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| 139 | size_t write_len;
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| 140 | CURLcode result = CURLE_OK;
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| 141 | char *s;
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| 142 | char *sptr;
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| 143 | va_list ap;
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| 144 | va_start(ap, fmt);
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| 145 | s = vaprintf(fmt, ap); /* returns an allocated string */
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| 146 | va_end(ap);
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| 147 | if(!s)
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| 148 | return CURLE_OUT_OF_MEMORY; /* failure */
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| 149 |
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| 150 | bytes_written = 0;
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| 151 | write_len = strlen(s);
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| 152 | sptr = s;
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| 153 |
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| 154 | for(;;) {
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| 155 | /* Write the buffer to the socket */
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| 156 | result = Curl_write(data, sockfd, sptr, write_len, &bytes_written);
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| 157 |
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| 158 | if(result)
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| 159 | break;
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| 160 |
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| 161 | Curl_debug(data, CURLINFO_DATA_OUT, sptr, (size_t)bytes_written);
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| 162 |
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| 163 | if((size_t)bytes_written != write_len) {
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| 164 | /* if not all was written at once, we must advance the pointer, decrease
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| 165 | the size left and try again! */
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| 166 | write_len -= bytes_written;
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| 167 | sptr += bytes_written;
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| 168 | }
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| 169 | else
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| 170 | break;
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| 171 | }
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| 172 |
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| 173 | free(s); /* free the output string */
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| 174 |
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| 175 | return result;
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| 176 | }
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| 177 |
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| 178 | static CURLcode dict_do(struct Curl_easy *data, bool *done)
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| 179 | {
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| 180 | char *word;
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| 181 | char *eword;
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| 182 | char *ppath;
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| 183 | char *database = NULL;
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| 184 | char *strategy = NULL;
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| 185 | char *nthdef = NULL; /* This is not part of the protocol, but required
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| 186 | by RFC 2229 */
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| 187 | CURLcode result = CURLE_OK;
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| 188 | struct connectdata *conn = data->conn;
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| 189 | curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
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| 190 |
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| 191 | char *path = data->state.up.path;
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| 192 |
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| 193 | *done = TRUE; /* unconditionally */
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| 194 |
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| 195 | if(strncasecompare(path, DICT_MATCH, sizeof(DICT_MATCH)-1) ||
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| 196 | strncasecompare(path, DICT_MATCH2, sizeof(DICT_MATCH2)-1) ||
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| 197 | strncasecompare(path, DICT_MATCH3, sizeof(DICT_MATCH3)-1)) {
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| 198 |
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| 199 | word = strchr(path, ':');
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| 200 | if(word) {
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| 201 | word++;
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| 202 | database = strchr(word, ':');
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| 203 | if(database) {
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| 204 | *database++ = (char)0;
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| 205 | strategy = strchr(database, ':');
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| 206 | if(strategy) {
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| 207 | *strategy++ = (char)0;
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| 208 | nthdef = strchr(strategy, ':');
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| 209 | if(nthdef) {
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| 210 | *nthdef = (char)0;
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| 211 | }
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| 212 | }
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| 213 | }
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| 214 | }
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| 215 |
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| 216 | if(!word || (*word == (char)0)) {
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| 217 | infof(data, "lookup word is missing");
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| 218 | word = (char *)"default";
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| 219 | }
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| 220 | if(!database || (*database == (char)0)) {
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| 221 | database = (char *)"!";
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| 222 | }
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| 223 | if(!strategy || (*strategy == (char)0)) {
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| 224 | strategy = (char *)".";
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| 225 | }
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| 226 |
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| 227 | eword = unescape_word(word);
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| 228 | if(!eword)
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| 229 | return CURLE_OUT_OF_MEMORY;
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| 230 |
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| 231 | result = sendf(sockfd, data,
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| 232 | "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
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| 233 | "MATCH "
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| 234 | "%s " /* database */
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| 235 | "%s " /* strategy */
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| 236 | "%s\r\n" /* word */
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| 237 | "QUIT\r\n",
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| 238 | database,
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| 239 | strategy,
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| 240 | eword);
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| 241 |
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| 242 | free(eword);
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| 243 |
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| 244 | if(result) {
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| 245 | failf(data, "Failed sending DICT request");
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| 246 | return result;
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| 247 | }
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| 248 | Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1); /* no upload */
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| 249 | }
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| 250 | else if(strncasecompare(path, DICT_DEFINE, sizeof(DICT_DEFINE)-1) ||
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| 251 | strncasecompare(path, DICT_DEFINE2, sizeof(DICT_DEFINE2)-1) ||
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| 252 | strncasecompare(path, DICT_DEFINE3, sizeof(DICT_DEFINE3)-1)) {
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| 253 |
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| 254 | word = strchr(path, ':');
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| 255 | if(word) {
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| 256 | word++;
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| 257 | database = strchr(word, ':');
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| 258 | if(database) {
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| 259 | *database++ = (char)0;
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| 260 | nthdef = strchr(database, ':');
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| 261 | if(nthdef) {
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| 262 | *nthdef = (char)0;
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| 263 | }
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| 264 | }
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| 265 | }
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| 266 |
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| 267 | if(!word || (*word == (char)0)) {
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| 268 | infof(data, "lookup word is missing");
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| 269 | word = (char *)"default";
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| 270 | }
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| 271 | if(!database || (*database == (char)0)) {
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| 272 | database = (char *)"!";
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| 273 | }
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| 274 |
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| 275 | eword = unescape_word(word);
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| 276 | if(!eword)
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| 277 | return CURLE_OUT_OF_MEMORY;
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| 278 |
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| 279 | result = sendf(sockfd, data,
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| 280 | "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
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| 281 | "DEFINE "
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| 282 | "%s " /* database */
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| 283 | "%s\r\n" /* word */
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| 284 | "QUIT\r\n",
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| 285 | database,
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| 286 | eword);
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| 287 |
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| 288 | free(eword);
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| 289 |
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| 290 | if(result) {
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| 291 | failf(data, "Failed sending DICT request");
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| 292 | return result;
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| 293 | }
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| 294 | Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
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| 295 | }
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| 296 | else {
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| 297 |
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| 298 | ppath = strchr(path, '/');
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| 299 | if(ppath) {
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| 300 | int i;
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| 301 |
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| 302 | ppath++;
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| 303 | for(i = 0; ppath[i]; i++) {
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| 304 | if(ppath[i] == ':')
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| 305 | ppath[i] = ' ';
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| 306 | }
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| 307 | result = sendf(sockfd, data,
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| 308 | "CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
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| 309 | "%s\r\n"
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| 310 | "QUIT\r\n", ppath);
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| 311 | if(result) {
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| 312 | failf(data, "Failed sending DICT request");
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| 313 | return result;
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| 314 | }
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| 315 |
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| 316 | Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
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| 317 | }
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| 318 | }
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| 319 |
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| 320 | return CURLE_OK;
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| 321 | }
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| 322 | #endif /* CURL_DISABLE_DICT */
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