1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2019, 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 #include "tool_operate.h"
32
33 #include "memdebug.h" /* keep this as LAST include */
34
35 /* create a local file for writing, return TRUE on success */
tool_create_output_file(struct OutStruct * outs)36 bool tool_create_output_file(struct OutStruct *outs)
37 {
38 struct GlobalConfig *global = outs->config->global;
39 FILE *file;
40
41 if(!outs->filename || !*outs->filename) {
42 warnf(global, "Remote filename has no length!\n");
43 return FALSE;
44 }
45
46 if(outs->is_cd_filename) {
47 /* don't overwrite existing files */
48 file = fopen(outs->filename, "rb");
49 if(file) {
50 fclose(file);
51 warnf(global, "Refusing to overwrite %s: %s\n", outs->filename,
52 strerror(EEXIST));
53 return FALSE;
54 }
55 }
56
57 /* open file for writing */
58 file = fopen(outs->filename, "wb");
59 if(!file) {
60 warnf(global, "Failed to create the file %s: %s\n", outs->filename,
61 strerror(errno));
62 return FALSE;
63 }
64 outs->s_isreg = TRUE;
65 outs->fopened = TRUE;
66 outs->stream = file;
67 outs->bytes = 0;
68 outs->init = 0;
69 return TRUE;
70 }
71
72 /*
73 ** callback for CURLOPT_WRITEFUNCTION
74 */
75
tool_write_cb(char * buffer,size_t sz,size_t nmemb,void * userdata)76 size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
77 {
78 size_t rc;
79 struct per_transfer *per = userdata;
80 struct OutStruct *outs = &per->outs;
81 struct OperationConfig *config = outs->config;
82 size_t bytes = sz * nmemb;
83 bool is_tty = config->global->isatty;
84 #ifdef WIN32
85 CONSOLE_SCREEN_BUFFER_INFO console_info;
86 intptr_t fhnd;
87 #endif
88
89 /*
90 * Once that libcurl has called back tool_write_cb() the returned value
91 * is checked against the amount that was intended to be written, if
92 * it does not match then it fails with CURLE_WRITE_ERROR. So at this
93 * point returning a value different from sz*nmemb indicates failure.
94 */
95 const size_t failure = bytes ? 0 : 1;
96
97 #ifdef DEBUGBUILD
98 {
99 char *tty = curlx_getenv("CURL_ISATTY");
100 if(tty) {
101 is_tty = TRUE;
102 curl_free(tty);
103 }
104 }
105
106 if(config->show_headers) {
107 if(bytes > (size_t)CURL_MAX_HTTP_HEADER) {
108 warnf(config->global, "Header data size exceeds single call write "
109 "limit!\n");
110 return failure;
111 }
112 }
113 else {
114 if(bytes > (size_t)CURL_MAX_WRITE_SIZE) {
115 warnf(config->global, "Data size exceeds single call write limit!\n");
116 return failure;
117 }
118 }
119
120 {
121 /* Some internal congruency checks on received OutStruct */
122 bool check_fails = FALSE;
123 if(outs->filename) {
124 /* regular file */
125 if(!*outs->filename)
126 check_fails = TRUE;
127 if(!outs->s_isreg)
128 check_fails = TRUE;
129 if(outs->fopened && !outs->stream)
130 check_fails = TRUE;
131 if(!outs->fopened && outs->stream)
132 check_fails = TRUE;
133 if(!outs->fopened && outs->bytes)
134 check_fails = TRUE;
135 }
136 else {
137 /* standard stream */
138 if(!outs->stream || outs->s_isreg || outs->fopened)
139 check_fails = TRUE;
140 if(outs->alloc_filename || outs->is_cd_filename || outs->init)
141 check_fails = TRUE;
142 }
143 if(check_fails) {
144 warnf(config->global, "Invalid output struct data for write callback\n");
145 return failure;
146 }
147 }
148 #endif
149
150 if(!outs->stream && !tool_create_output_file(outs))
151 return failure;
152
153 if(is_tty && (outs->bytes < 2000) && !config->terminal_binary_ok) {
154 /* binary output to terminal? */
155 if(memchr(buffer, 0, bytes)) {
156 warnf(config->global, "Binary output can mess up your terminal. "
157 "Use \"--output -\" to tell curl to output it to your terminal "
158 "anyway, or consider \"--output <FILE>\" to save to a file.\n");
159 config->synthetic_error = ERR_BINARY_TERMINAL;
160 return failure;
161 }
162 }
163
164 #ifdef WIN32
165 fhnd = _get_osfhandle(fileno(outs->stream));
166 if(isatty(fileno(outs->stream)) &&
167 GetConsoleScreenBufferInfo((HANDLE)fhnd, &console_info)) {
168 DWORD in_len = (DWORD)(sz * nmemb);
169 wchar_t* wc_buf;
170 DWORD wc_len;
171
172 /* calculate buffer size for wide characters */
173 wc_len = MultiByteToWideChar(CP_UTF8, 0, buffer, in_len, NULL, 0);
174 wc_buf = (wchar_t*) malloc(wc_len * sizeof(wchar_t));
175 if(!wc_buf)
176 return failure;
177
178 /* calculate buffer size for multi-byte characters */
179 wc_len = MultiByteToWideChar(CP_UTF8, 0, buffer, in_len, wc_buf, wc_len);
180 if(!wc_len) {
181 free(wc_buf);
182 return failure;
183 }
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(per->curl, 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