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Diffstat (limited to 'Utilities/cmcurl/lib/gopher.c')
| -rw-r--r-- | Utilities/cmcurl/lib/gopher.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/gopher.c b/Utilities/cmcurl/lib/gopher.c new file mode 100644 index 0000000000..6fbb7de327 --- /dev/null +++ b/Utilities/cmcurl/lib/gopher.c @@ -0,0 +1,242 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2022, 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_GOPHER + +#include "urldata.h" +#include <curl/curl.h> +#include "transfer.h" +#include "sendf.h" +#include "cfilters.h" +#include "connect.h" +#include "progress.h" +#include "gopher.h" +#include "select.h" +#include "strdup.h" +#include "vtls/vtls.h" +#include "url.h" +#include "escape.h" +#include "warnless.h" +#include "curl_printf.h" +#include "curl_memory.h" +/* The last #include file should be: */ +#include "memdebug.h" + +/* + * Forward declarations. + */ + +static CURLcode gopher_do(struct Curl_easy *data, bool *done); +#ifdef USE_SSL +static CURLcode gopher_connect(struct Curl_easy *data, bool *done); +static CURLcode gopher_connecting(struct Curl_easy *data, bool *done); +#endif + +/* + * Gopher protocol handler. + * This is also a nice simple template to build off for simple + * connect-command-download protocols. + */ + +const struct Curl_handler Curl_handler_gopher = { + "GOPHER", /* scheme */ + ZERO_NULL, /* setup_connection */ + gopher_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, /* readwrite */ + ZERO_NULL, /* connection_check */ + ZERO_NULL, /* attach connection */ + PORT_GOPHER, /* defport */ + CURLPROTO_GOPHER, /* protocol */ + CURLPROTO_GOPHER, /* family */ + PROTOPT_NONE /* flags */ +}; + +#ifdef USE_SSL +const struct Curl_handler Curl_handler_gophers = { + "GOPHERS", /* scheme */ + ZERO_NULL, /* setup_connection */ + gopher_do, /* do_it */ + ZERO_NULL, /* done */ + ZERO_NULL, /* do_more */ + gopher_connect, /* connect_it */ + gopher_connecting, /* 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, /* readwrite */ + ZERO_NULL, /* connection_check */ + ZERO_NULL, /* attach connection */ + PORT_GOPHER, /* defport */ + CURLPROTO_GOPHERS, /* protocol */ + CURLPROTO_GOPHER, /* family */ + PROTOPT_SSL /* flags */ +}; + +static CURLcode gopher_connect(struct Curl_easy *data, bool *done) +{ + (void)data; + (void)done; + return CURLE_OK; +} + +static CURLcode gopher_connecting(struct Curl_easy *data, bool *done) +{ + struct connectdata *conn = data->conn; + CURLcode result; + + result = Curl_conn_connect(data, FIRSTSOCKET, TRUE, done); + if(result) + connclose(conn, "Failed TLS connection"); + *done = TRUE; + return result; +} +#endif + +static CURLcode gopher_do(struct Curl_easy *data, bool *done) +{ + CURLcode result = CURLE_OK; + struct connectdata *conn = data->conn; + curl_socket_t sockfd = conn->sock[FIRSTSOCKET]; + char *gopherpath; + char *path = data->state.up.path; + char *query = data->state.up.query; + char *sel = NULL; + char *sel_org = NULL; + timediff_t timeout_ms; + ssize_t amount, k; + size_t len; + int what; + + *done = TRUE; /* unconditionally */ + + /* path is guaranteed non-NULL */ + DEBUGASSERT(path); + + if(query) + gopherpath = aprintf("%s?%s", path, query); + else + gopherpath = strdup(path); + + if(!gopherpath) + return CURLE_OUT_OF_MEMORY; + + /* Create selector. Degenerate cases: / and /1 => convert to "" */ + if(strlen(gopherpath) <= 2) { + sel = (char *)""; + len = strlen(sel); + free(gopherpath); + } + else { + char *newp; + + /* Otherwise, drop / and the first character (i.e., item type) ... */ + newp = gopherpath; + newp += 2; + + /* ... and finally unescape */ + result = Curl_urldecode(newp, 0, &sel, &len, REJECT_ZERO); + free(gopherpath); + if(result) + return result; + sel_org = sel; + } + + k = curlx_uztosz(len); + + for(;;) { + /* Break out of the loop if the selector is empty because OpenSSL and/or + LibreSSL fail with errno 0 if this is the case. */ + if(strlen(sel) < 1) + break; + + result = Curl_write(data, sockfd, sel, k, &amount); + if(!result) { /* Which may not have written it all! */ + result = Curl_client_write(data, CLIENTWRITE_HEADER, sel, amount); + if(result) + break; + + k -= amount; + sel += amount; + if(k < 1) + break; /* but it did write it all */ + } + else + break; + + timeout_ms = Curl_timeleft(data, NULL, FALSE); + if(timeout_ms < 0) { + result = CURLE_OPERATION_TIMEDOUT; + break; + } + if(!timeout_ms) + timeout_ms = TIMEDIFF_T_MAX; + + /* Don't busyloop. The entire loop thing is a work-around as it causes a + BLOCKING behavior which is a NO-NO. This function should rather be + split up in a do and a doing piece where the pieces that aren't + possible to send now will be sent in the doing function repeatedly + until the entire request is sent. + */ + what = SOCKET_WRITABLE(sockfd, timeout_ms); + if(what < 0) { + result = CURLE_SEND_ERROR; + break; + } + else if(!what) { + result = CURLE_OPERATION_TIMEDOUT; + break; + } + } + + free(sel_org); + + if(!result) + result = Curl_write(data, sockfd, "\r\n", 2, &amount); + if(result) { + failf(data, "Failed sending Gopher request"); + return result; + } + result = Curl_client_write(data, CLIENTWRITE_HEADER, (char *)"\r\n", 2); + if(result) + return result; + + Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1); + return CURLE_OK; +} +#endif /* CURL_DISABLE_GOPHER */ |