Annotation of embedaddon/curl/lib/gopher.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2020, 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.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 "connect.h"
! 32: #include "progress.h"
! 33: #include "gopher.h"
! 34: #include "select.h"
! 35: #include "strdup.h"
! 36: #include "url.h"
! 37: #include "escape.h"
! 38: #include "warnless.h"
! 39: #include "curl_printf.h"
! 40: #include "curl_memory.h"
! 41: /* The last #include file should be: */
! 42: #include "memdebug.h"
! 43:
! 44: /*
! 45: * Forward declarations.
! 46: */
! 47:
! 48: static CURLcode gopher_do(struct connectdata *conn, bool *done);
! 49:
! 50: /*
! 51: * Gopher protocol handler.
! 52: * This is also a nice simple template to build off for simple
! 53: * connect-command-download protocols.
! 54: */
! 55:
! 56: const struct Curl_handler Curl_handler_gopher = {
! 57: "GOPHER", /* scheme */
! 58: ZERO_NULL, /* setup_connection */
! 59: gopher_do, /* do_it */
! 60: ZERO_NULL, /* done */
! 61: ZERO_NULL, /* do_more */
! 62: ZERO_NULL, /* connect_it */
! 63: ZERO_NULL, /* connecting */
! 64: ZERO_NULL, /* doing */
! 65: ZERO_NULL, /* proto_getsock */
! 66: ZERO_NULL, /* doing_getsock */
! 67: ZERO_NULL, /* domore_getsock */
! 68: ZERO_NULL, /* perform_getsock */
! 69: ZERO_NULL, /* disconnect */
! 70: ZERO_NULL, /* readwrite */
! 71: ZERO_NULL, /* connection_check */
! 72: PORT_GOPHER, /* defport */
! 73: CURLPROTO_GOPHER, /* protocol */
! 74: PROTOPT_NONE /* flags */
! 75: };
! 76:
! 77: static CURLcode gopher_do(struct connectdata *conn, bool *done)
! 78: {
! 79: CURLcode result = CURLE_OK;
! 80: struct Curl_easy *data = conn->data;
! 81: curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
! 82: char *gopherpath;
! 83: char *path = data->state.up.path;
! 84: char *query = data->state.up.query;
! 85: char *sel = NULL;
! 86: char *sel_org = NULL;
! 87: timediff_t timeout_ms;
! 88: ssize_t amount, k;
! 89: size_t len;
! 90: int what;
! 91:
! 92: *done = TRUE; /* unconditionally */
! 93:
! 94: /* path is guaranteed non-NULL */
! 95: DEBUGASSERT(path);
! 96:
! 97: if(query)
! 98: gopherpath = aprintf("%s?%s", path, query);
! 99: else
! 100: gopherpath = strdup(path);
! 101:
! 102: if(!gopherpath)
! 103: return CURLE_OUT_OF_MEMORY;
! 104:
! 105: /* Create selector. Degenerate cases: / and /1 => convert to "" */
! 106: if(strlen(gopherpath) <= 2) {
! 107: sel = (char *)"";
! 108: len = strlen(sel);
! 109: free(gopherpath);
! 110: }
! 111: else {
! 112: char *newp;
! 113:
! 114: /* Otherwise, drop / and the first character (i.e., item type) ... */
! 115: newp = gopherpath;
! 116: newp += 2;
! 117:
! 118: /* ... and finally unescape */
! 119: result = Curl_urldecode(data, newp, 0, &sel, &len, FALSE);
! 120: free(gopherpath);
! 121: if(result)
! 122: return result;
! 123: sel_org = sel;
! 124: }
! 125:
! 126: /* We use Curl_write instead of Curl_sendf to make sure the entire buffer is
! 127: sent, which could be sizeable with long selectors. */
! 128: k = curlx_uztosz(len);
! 129:
! 130: for(;;) {
! 131: result = Curl_write(conn, sockfd, sel, k, &amount);
! 132: if(!result) { /* Which may not have written it all! */
! 133: result = Curl_client_write(conn, CLIENTWRITE_HEADER, sel, amount);
! 134: if(result)
! 135: break;
! 136:
! 137: k -= amount;
! 138: sel += amount;
! 139: if(k < 1)
! 140: break; /* but it did write it all */
! 141: }
! 142: else
! 143: break;
! 144:
! 145: timeout_ms = Curl_timeleft(conn->data, NULL, FALSE);
! 146: if(timeout_ms < 0) {
! 147: result = CURLE_OPERATION_TIMEDOUT;
! 148: break;
! 149: }
! 150: if(!timeout_ms)
! 151: timeout_ms = TIMEDIFF_T_MAX;
! 152:
! 153: /* Don't busyloop. The entire loop thing is a work-around as it causes a
! 154: BLOCKING behavior which is a NO-NO. This function should rather be
! 155: split up in a do and a doing piece where the pieces that aren't
! 156: possible to send now will be sent in the doing function repeatedly
! 157: until the entire request is sent.
! 158: */
! 159: what = SOCKET_WRITABLE(sockfd, timeout_ms);
! 160: if(what < 0) {
! 161: result = CURLE_SEND_ERROR;
! 162: break;
! 163: }
! 164: else if(!what) {
! 165: result = CURLE_OPERATION_TIMEDOUT;
! 166: break;
! 167: }
! 168: }
! 169:
! 170: free(sel_org);
! 171:
! 172: if(!result)
! 173: /* We can use Curl_sendf to send the terminal \r\n relatively safely and
! 174: save allocing another string/doing another _write loop. */
! 175: result = Curl_sendf(sockfd, conn, "\r\n");
! 176: if(result) {
! 177: failf(data, "Failed sending Gopher request");
! 178: return result;
! 179: }
! 180: result = Curl_client_write(conn, CLIENTWRITE_HEADER, (char *)"\r\n", 2);
! 181: if(result)
! 182: return result;
! 183:
! 184: Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
! 185: return CURLE_OK;
! 186: }
! 187: #endif /*CURL_DISABLE_GOPHER*/
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