1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel (at) 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 23 #include "curl_setup.h" 24 25 #ifndef CURL_DISABLE_GOPHER 26 27 #include "urldata.h" 28 #include <curl/curl.h> 29 #include "transfer.h" 30 #include "sendf.h" 31 #include "progress.h" 32 #include "gopher.h" 33 #include "select.h" 34 #include "url.h" 35 #include "escape.h" 36 #include "warnless.h" 37 #include "curl_memory.h" 38 /* The last #include file should be: */ 39 #include "memdebug.h" 40 41 /* 42 * Forward declarations. 43 */ 44 45 static CURLcode gopher_do(struct connectdata *conn, bool *done); 46 47 /* 48 * Gopher protocol handler. 49 * This is also a nice simple template to build off for simple 50 * connect-command-download protocols. 51 */ 52 53 const struct Curl_handler Curl_handler_gopher = { 54 "GOPHER", /* scheme */ 55 ZERO_NULL, /* setup_connection */ 56 gopher_do, /* do_it */ 57 ZERO_NULL, /* done */ 58 ZERO_NULL, /* do_more */ 59 ZERO_NULL, /* connect_it */ 60 ZERO_NULL, /* connecting */ 61 ZERO_NULL, /* doing */ 62 ZERO_NULL, /* proto_getsock */ 63 ZERO_NULL, /* doing_getsock */ 64 ZERO_NULL, /* domore_getsock */ 65 ZERO_NULL, /* perform_getsock */ 66 ZERO_NULL, /* disconnect */ 67 ZERO_NULL, /* readwrite */ 68 ZERO_NULL, /* connection_check */ 69 PORT_GOPHER, /* defport */ 70 CURLPROTO_GOPHER, /* protocol */ 71 PROTOPT_NONE /* flags */ 72 }; 73 74 static CURLcode gopher_do(struct connectdata *conn, bool *done) 75 { 76 CURLcode result = CURLE_OK; 77 struct Curl_easy *data = conn->data; 78 curl_socket_t sockfd = conn->sock[FIRSTSOCKET]; 79 80 curl_off_t *bytecount = &data->req.bytecount; 81 char *path = data->state.path; 82 char *sel = NULL; 83 char *sel_org = NULL; 84 ssize_t amount, k; 85 size_t len; 86 87 *done = TRUE; /* unconditionally */ 88 89 /* Create selector. Degenerate cases: / and /1 => convert to "" */ 90 if(strlen(path) <= 2) { 91 sel = (char *)""; 92 len = (int)strlen(sel); 93 } 94 else { 95 char *newp; 96 size_t j, i; 97 98 /* Otherwise, drop / and the first character (i.e., item type) ... */ 99 newp = path; 100 newp += 2; 101 102 /* ... then turn ? into TAB for search servers, Veronica, etc. ... */ 103 j = strlen(newp); 104 for(i = 0; i<j; i++) 105 if(newp[i] == '?') 106 newp[i] = '\x09'; 107 108 /* ... and finally unescape */ 109 result = Curl_urldecode(data, newp, 0, &sel, &len, FALSE); 110 if(result) 111 return result; 112 sel_org = sel; 113 } 114 115 /* We use Curl_write instead of Curl_sendf to make sure the entire buffer is 116 sent, which could be sizeable with long selectors. */ 117 k = curlx_uztosz(len); 118 119 for(;;) { 120 result = Curl_write(conn, sockfd, sel, k, &amount); 121 if(!result) { /* Which may not have written it all! */ 122 result = Curl_client_write(conn, CLIENTWRITE_HEADER, sel, amount); 123 if(result) 124 break; 125 126 k -= amount; 127 sel += amount; 128 if(k < 1) 129 break; /* but it did write it all */ 130 } 131 else 132 break; 133 134 /* Don't busyloop. The entire loop thing is a work-around as it causes a 135 BLOCKING behavior which is a NO-NO. This function should rather be 136 split up in a do and a doing piece where the pieces that aren't 137 possible to send now will be sent in the doing function repeatedly 138 until the entire request is sent. 139 140 Wait a while for the socket to be writable. Note that this doesn't 141 acknowledge the timeout. 142 */ 143 if(SOCKET_WRITABLE(sockfd, 100) < 0) { 144 result = CURLE_SEND_ERROR; 145 break; 146 } 147 } 148 149 free(sel_org); 150 151 if(!result) 152 /* We can use Curl_sendf to send the terminal \r\n relatively safely and 153 save allocing another string/doing another _write loop. */ 154 result = Curl_sendf(sockfd, conn, "\r\n"); 155 if(result) { 156 failf(data, "Failed sending Gopher request"); 157 return result; 158 } 159 result = Curl_client_write(conn, CLIENTWRITE_HEADER, (char *)"\r\n", 2); 160 if(result) 161 return result; 162 163 Curl_setup_transfer(conn, FIRSTSOCKET, -1, FALSE, bytecount, 164 -1, NULL); /* no upload */ 165 return CURLE_OK; 166 } 167 #endif /*CURL_DISABLE_GOPHER*/ 168
