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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