1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, 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 "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 PORT_GOPHER, /* defport */
69 CURLPROTO_GOPHER, /* protocol */
70 PROTOPT_NONE /* flags */
71 };
72
gopher_do(struct connectdata * conn,bool * done)73 static CURLcode gopher_do(struct connectdata *conn, bool *done)
74 {
75 CURLcode result=CURLE_OK;
76 struct Curl_easy *data=conn->data;
77 curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
78
79 curl_off_t *bytecount = &data->req.bytecount;
80 char *path = data->state.path;
81 char *sel;
82 char *sel_org = NULL;
83 ssize_t amount, k;
84 size_t len;
85
86 *done = TRUE; /* unconditionally */
87
88 /* Create selector. Degenerate cases: / and /1 => convert to "" */
89 if(strlen(path) <= 2) {
90 sel = (char *)"";
91 len = (int)strlen(sel);
92 }
93 else {
94 char *newp;
95 size_t j, i;
96
97 /* Otherwise, drop / and the first character (i.e., item type) ... */
98 newp = path;
99 newp+=2;
100
101 /* ... then turn ? into TAB for search servers, Veronica, etc. ... */
102 j = strlen(newp);
103 for(i=0; i<j; i++)
104 if(newp[i] == '?')
105 newp[i] = '\x09';
106
107 /* ... and finally unescape */
108 result = Curl_urldecode(data, newp, 0, &sel, &len, FALSE);
109 if(!sel)
110 return CURLE_OUT_OF_MEMORY;
111 sel_org = sel;
112 }
113
114 /* We use Curl_write instead of Curl_sendf to make sure the entire buffer is
115 sent, which could be sizeable with long selectors. */
116 k = curlx_uztosz(len);
117
118 for(;;) {
119 result = Curl_write(conn, sockfd, sel, k, &amount);
120 if(!result) { /* Which may not have written it all! */
121 result = Curl_client_write(conn, CLIENTWRITE_HEADER, sel, amount);
122 if(result)
123 break;
124
125 k -= amount;
126 sel += amount;
127 if(k < 1)
128 break; /* but it did write it all */
129 }
130 else
131 break;
132
133 /* Don't busyloop. The entire loop thing is a work-around as it causes a
134 BLOCKING behavior which is a NO-NO. This function should rather be
135 split up in a do and a doing piece where the pieces that aren't
136 possible to send now will be sent in the doing function repeatedly
137 until the entire request is sent.
138
139 Wait a while for the socket to be writable. Note that this doesn't
140 acknowledge the timeout.
141 */
142 if(SOCKET_WRITABLE(sockfd, 100) < 0) {
143 result = CURLE_SEND_ERROR;
144 break;
145 }
146 }
147
148 free(sel_org);
149
150 if(!result)
151 /* We can use Curl_sendf to send the terminal \r\n relatively safely and
152 save allocing another string/doing another _write loop. */
153 result = Curl_sendf(sockfd, conn, "\r\n");
154 if(result) {
155 failf(data, "Failed sending Gopher request");
156 return result;
157 }
158 result = Curl_client_write(conn, CLIENTWRITE_HEADER, (char *)"\r\n", 2);
159 if(result)
160 return result;
161
162 Curl_setup_transfer(conn, FIRSTSOCKET, -1, FALSE, bytecount,
163 -1, NULL); /* no upload */
164 return CURLE_OK;
165 }
166 #endif /*CURL_DISABLE_GOPHER*/
167