1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2018, 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 #include "tool_setup.h"
23
24 #define ENABLE_CURLX_PRINTF
25 /* use our own printf() functions */
26 #include "curlx.h"
27
28 #include "tool_cfgable.h"
29 #include "tool_msgs.h"
30 #include "tool_cb_wrt.h"
31
32 #include "memdebug.h" /* keep this as LAST include */
33
34 /* create a local file for writing, return TRUE on success */
tool_create_output_file(struct OutStruct * outs)35 bool tool_create_output_file(struct OutStruct *outs)
36 {
37 struct GlobalConfig *global = outs->config->global;
38 FILE *file;
39
40 if(!outs->filename || !*outs->filename) {
41 warnf(global, "Remote filename has no length!\n");
42 return FALSE;
43 }
44
45 if(outs->is_cd_filename) {
46 /* don't overwrite existing files */
47 file = fopen(outs->filename, "rb");
48 if(file) {
49 fclose(file);
50 warnf(global, "Refusing to overwrite %s: %s\n", outs->filename,
51 strerror(EEXIST));
52 return FALSE;
53 }
54 }
55
56 /* open file for writing */
57 file = fopen(outs->filename, "wb");
58 if(!file) {
59 warnf(global, "Failed to create the file %s: %s\n", outs->filename,
60 strerror(errno));
61 return FALSE;
62 }
63 outs->s_isreg = TRUE;
64 outs->fopened = TRUE;
65 outs->stream = file;
66 outs->bytes = 0;
67 outs->init = 0;
68 return TRUE;
69 }
70
71 /*
72 ** callback for CURLOPT_WRITEFUNCTION
73 */
74
tool_write_cb(char * buffer,size_t sz,size_t nmemb,void * userdata)75 size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
76 {
77 size_t rc;
78 struct OutStruct *outs = userdata;
79 struct OperationConfig *config = outs->config;
80 size_t bytes = sz * nmemb;
81 bool is_tty = config->global->isatty;
82 #ifdef WIN32
83 CONSOLE_SCREEN_BUFFER_INFO console_info;
84 #endif
85
86 /*
87 * Once that libcurl has called back tool_write_cb() the returned value
88 * is checked against the amount that was intended to be written, if
89 * it does not match then it fails with CURLE_WRITE_ERROR. So at this
90 * point returning a value different from sz*nmemb indicates failure.
91 */
92 const size_t failure = bytes ? 0 : 1;
93
94 #ifdef DEBUGBUILD
95 {
96 char *tty = curlx_getenv("CURL_ISATTY");
97 if(tty) {
98 is_tty = TRUE;
99 curl_free(tty);
100 }
101 }
102
103 if(config->show_headers) {
104 if(bytes > (size_t)CURL_MAX_HTTP_HEADER) {
105 warnf(config->global, "Header data size exceeds single call write "
106 "limit!\n");
107 return failure;
108 }
109 }
110 else {
111 if(bytes > (size_t)CURL_MAX_WRITE_SIZE) {
112 warnf(config->global, "Data size exceeds single call write limit!\n");
113 return failure;
114 }
115 }
116
117 {
118 /* Some internal congruency checks on received OutStruct */
119 bool check_fails = FALSE;
120 if(outs->filename) {
121 /* regular file */
122 if(!*outs->filename)
123 check_fails = TRUE;
124 if(!outs->s_isreg)
125 check_fails = TRUE;
126 if(outs->fopened && !outs->stream)
127 check_fails = TRUE;
128 if(!outs->fopened && outs->stream)
129 check_fails = TRUE;
130 if(!outs->fopened && outs->bytes)
131 check_fails = TRUE;
132 }
133 else {
134 /* standard stream */
135 if(!outs->stream || outs->s_isreg || outs->fopened)
136 check_fails = TRUE;
137 if(outs->alloc_filename || outs->is_cd_filename || outs->init)
138 check_fails = TRUE;
139 }
140 if(check_fails) {
141 warnf(config->global, "Invalid output struct data for write callback\n");
142 return failure;
143 }
144 }
145 #endif
146
147 if(!outs->stream && !tool_create_output_file(outs))
148 return failure;
149
150 if(is_tty && (outs->bytes < 2000) && !config->terminal_binary_ok) {
151 /* binary output to terminal? */
152 if(memchr(buffer, 0, bytes)) {
153 warnf(config->global, "Binary output can mess up your terminal. "
154 "Use \"--output -\" to tell curl to output it to your terminal "
155 "anyway, or consider \"--output <FILE>\" to save to a file.\n");
156 config->synthetic_error = ERR_BINARY_TERMINAL;
157 return failure;
158 }
159 }
160
161 #ifdef _WIN32
162 if(isatty(fileno(outs->stream)) &&
163 GetConsoleScreenBufferInfo(
164 (HANDLE)_get_osfhandle(fileno(outs->stream)), &console_info)) {
165 DWORD in_len = (DWORD)(sz * nmemb);
166 wchar_t* wc_buf;
167 DWORD wc_len;
168 intptr_t fhnd;
169
170 /* calculate buffer size for wide characters */
171 wc_len = MultiByteToWideChar(CP_UTF8, 0, buffer, in_len, NULL, 0);
172 wc_buf = (wchar_t*) malloc(wc_len * sizeof(wchar_t));
173 if(!wc_buf)
174 return failure;
175
176 /* calculate buffer size for multi-byte characters */
177 wc_len = MultiByteToWideChar(CP_UTF8, 0, buffer, in_len, wc_buf, wc_len);
178 if(!wc_len) {
179 free(wc_buf);
180 return failure;
181 }
182
183 fhnd = _get_osfhandle(fileno(outs->stream));
184
185 if(!WriteConsoleW(
186 (HANDLE) fhnd,
187 wc_buf,
188 wc_len,
189 &wc_len,
190 NULL)) {
191 free(wc_buf);
192 return failure;
193 }
194 free(wc_buf);
195 rc = bytes;
196 }
197 else
198 #endif
199 rc = fwrite(buffer, sz, nmemb, outs->stream);
200
201 if(bytes == rc)
202 /* we added this amount of data to the output */
203 outs->bytes += bytes;
204
205 if(config->readbusy) {
206 config->readbusy = FALSE;
207 curl_easy_pause(config->easy, CURLPAUSE_CONT);
208 }
209
210 if(config->nobuffer) {
211 /* output buffering disabled */
212 int res = fflush(outs->stream);
213 if(res)
214 return failure;
215 }
216
217 return rc;
218 }
219