1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2015, 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 32 #include "progress.h" 33 #include "strequal.h" 34 #include "gopher.h" 35 #include "rawstr.h" 36 #include "select.h" 37 #include "url.h" 38 #include "warnless.h" 39 #include "curl_memory.h" 40 /* The last #include file should be: */ 41 #include "memdebug.h" 42 43 /* 44 * Forward declarations. 45 */ 46 47 static CURLcode gopher_do(struct connectdata *conn, bool *done); 48 49 /* 50 * Gopher protocol handler. 51 * This is also a nice simple template to build off for simple 52 * connect-command-download protocols. 53 */ 54 55 const struct Curl_handler Curl_handler_gopher = { 56 "GOPHER", /* scheme */ 57 ZERO_NULL, /* setup_connection */ 58 gopher_do, /* do_it */ 59 ZERO_NULL, /* done */ 60 ZERO_NULL, /* do_more */ 61 ZERO_NULL, /* connect_it */ 62 ZERO_NULL, /* connecting */ 63 ZERO_NULL, /* doing */ 64 ZERO_NULL, /* proto_getsock */ 65 ZERO_NULL, /* doing_getsock */ 66 ZERO_NULL, /* domore_getsock */ 67 ZERO_NULL, /* perform_getsock */ 68 ZERO_NULL, /* disconnect */ 69 ZERO_NULL, /* readwrite */ 70 PORT_GOPHER, /* defport */ 71 CURLPROTO_GOPHER, /* protocol */ 72 PROTOPT_NONE /* flags */ 73 }; 74 75 static CURLcode gopher_do(struct connectdata *conn, bool *done) 76 { 77 CURLcode result=CURLE_OK; 78 struct Curl_easy *data=conn->data; 79 curl_socket_t sockfd = conn->sock[FIRSTSOCKET]; 80 81 curl_off_t *bytecount = &data->req.bytecount; 82 char *path = data->state.path; 83 char *sel; 84 char *sel_org = NULL; 85 ssize_t amount, k; 86 int len; 87 88 *done = TRUE; /* unconditionally */ 89 90 /* Create selector. Degenerate cases: / and /1 => convert to "" */ 91 if(strlen(path) <= 2) { 92 sel = (char *)""; 93 len = (int)strlen(sel); 94 } 95 else { 96 char *newp; 97 size_t j, i; 98 99 /* Otherwise, drop / and the first character (i.e., item type) ... */ 100 newp = path; 101 newp+=2; 102 103 /* ... then turn ? into TAB for search servers, Veronica, etc. ... */ 104 j = strlen(newp); 105 for(i=0; i<j; i++) 106 if(newp[i] == '?') 107 newp[i] = '\x09'; 108 109 /* ... and finally unescape */ 110 sel = curl_easy_unescape(data, newp, 0, &len); 111 if(!sel) 112 return CURLE_OUT_OF_MEMORY; 113 sel_org = sel; 114 } 115 116 /* We use Curl_write instead of Curl_sendf to make sure the entire buffer is 117 sent, which could be sizeable with long selectors. */ 118 k = curlx_uztosz(len); 119 120 for(;;) { 121 result = Curl_write(conn, sockfd, sel, k, &amount); 122 if(!result) { /* Which may not have written it all! */ 123 result = Curl_client_write(conn, CLIENTWRITE_HEADER, sel, amount); 124 if(result) { 125 free(sel_org); 126 return result; 127 } 128 k -= amount; 129 sel += amount; 130 if(k < 1) 131 break; /* but it did write it all */ 132 } 133 else { 134 failf(data, "Failed sending Gopher request"); 135 free(sel_org); 136 return result; 137 } 138 /* Don't busyloop. The entire loop thing is a work-around as it causes a 139 BLOCKING behavior which is a NO-NO. This function should rather be 140 split up in a do and a doing piece where the pieces that aren't 141 possible to send now will be sent in the doing function repeatedly 142 until the entire request is sent. 143 144 Wait a while for the socket to be writable. Note that this doesn't 145 acknowledge the timeout. 146 */ 147 Curl_socket_ready(CURL_SOCKET_BAD, sockfd, 100); 148 } 149 150 free(sel_org); 151 152 /* 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
