[352] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 | #include "tool_setup.h"
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| 23 |
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| 24 | #define ENABLE_CURLX_PRINTF
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| 25 | /* use our own printf() functions */
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| 26 | #include "curlx.h"
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| 27 |
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| 28 | #include "tool_cfgable.h"
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| 29 | #include "tool_msgs.h"
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| 30 | #include "tool_cb_wrt.h"
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| 31 |
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| 32 | #include "memdebug.h" /* keep this as LAST include */
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| 33 |
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| 34 | /* create a local file for writing, return TRUE on success */
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| 35 | bool tool_create_output_file(struct OutStruct *outs)
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| 36 | {
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| 37 | struct GlobalConfig *global = outs->config->global;
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| 38 | FILE *file;
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| 39 |
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| 40 | if(!outs->filename || !*outs->filename) {
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| 41 | warnf(global, "Remote filename has no length!\n");
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| 42 | return FALSE;
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| 43 | }
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| 44 |
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| 45 | if(outs->is_cd_filename) {
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| 46 | /* don't overwrite existing files */
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| 47 | file = fopen(outs->filename, "rb");
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| 48 | if(file) {
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| 49 | fclose(file);
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| 50 | warnf(global, "Refusing to overwrite %s: %s\n", outs->filename,
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| 51 | strerror(EEXIST));
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| 52 | return FALSE;
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | /* open file for writing */
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| 57 | file = fopen(outs->filename, "wb");
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| 58 | if(!file) {
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| 59 | warnf(global, "Failed to create the file %s: %s\n", outs->filename,
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| 60 | strerror(errno));
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| 61 | return FALSE;
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| 62 | }
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| 63 | outs->s_isreg = TRUE;
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| 64 | outs->fopened = TRUE;
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| 65 | outs->stream = file;
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| 66 | outs->bytes = 0;
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| 67 | outs->init = 0;
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| 68 | return TRUE;
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| 69 | }
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| 70 |
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| 71 | /*
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| 72 | ** callback for CURLOPT_WRITEFUNCTION
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| 73 | */
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| 74 |
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| 75 | size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
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| 76 | {
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| 77 | size_t rc;
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| 78 | struct OutStruct *outs = userdata;
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| 79 | struct OperationConfig *config = outs->config;
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| 80 | size_t bytes = sz * nmemb;
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| 81 | bool is_tty = config->global->isatty;
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| 82 |
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| 83 | /*
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| 84 | * Once that libcurl has called back tool_write_cb() the returned value
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| 85 | * is checked against the amount that was intended to be written, if
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| 86 | * it does not match then it fails with CURLE_WRITE_ERROR. So at this
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| 87 | * point returning a value different from sz*nmemb indicates failure.
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| 88 | */
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| 89 | const size_t failure = bytes ? 0 : 1;
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| 90 |
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| 91 | #ifdef DEBUGBUILD
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| 92 | {
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| 93 | char *tty = curlx_getenv("CURL_ISATTY");
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| 94 | if(tty) {
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| 95 | is_tty = TRUE;
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| 96 | curl_free(tty);
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| 97 | }
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| 98 | }
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| 99 |
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| 100 | if(config->include_headers) {
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| 101 | if(bytes > (size_t)CURL_MAX_HTTP_HEADER) {
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| 102 | warnf(config->global, "Header data size exceeds single call write "
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| 103 | "limit!\n");
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| 104 | return failure;
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| 105 | }
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| 106 | }
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| 107 | else {
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| 108 | if(bytes > (size_t)CURL_MAX_WRITE_SIZE) {
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| 109 | warnf(config->global, "Data size exceeds single call write limit!\n");
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| 110 | return failure;
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| 111 | }
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| 112 | }
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| 113 |
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| 114 | {
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| 115 | /* Some internal congruency checks on received OutStruct */
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| 116 | bool check_fails = FALSE;
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| 117 | if(outs->filename) {
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| 118 | /* regular file */
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| 119 | if(!*outs->filename)
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| 120 | check_fails = TRUE;
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| 121 | if(!outs->s_isreg)
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| 122 | check_fails = TRUE;
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| 123 | if(outs->fopened && !outs->stream)
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| 124 | check_fails = TRUE;
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| 125 | if(!outs->fopened && outs->stream)
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| 126 | check_fails = TRUE;
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| 127 | if(!outs->fopened && outs->bytes)
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| 128 | check_fails = TRUE;
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| 129 | }
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| 130 | else {
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| 131 | /* standard stream */
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| 132 | if(!outs->stream || outs->s_isreg || outs->fopened)
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| 133 | check_fails = TRUE;
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| 134 | if(outs->alloc_filename || outs->is_cd_filename || outs->init)
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| 135 | check_fails = TRUE;
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| 136 | }
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| 137 | if(check_fails) {
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| 138 | warnf(config->global, "Invalid output struct data for write callback\n");
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| 139 | return failure;
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| 140 | }
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| 141 | }
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| 142 | #endif
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| 143 |
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| 144 | if(!outs->stream && !tool_create_output_file(outs))
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| 145 | return failure;
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| 146 |
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| 147 | if(is_tty && (outs->bytes < 2000) && !config->terminal_binary_ok) {
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| 148 | /* binary output to terminal? */
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| 149 | if(memchr(buffer, 0, bytes)) {
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| 150 | warnf(config->global, "Binary output can mess up your terminal. "
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| 151 | "Use \"--output -\" to tell curl to output it to your terminal "
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| 152 | "anyway, or consider \"--output <FILE>\" to save to a file.\n");
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| 153 | config->synthetic_error = ERR_BINARY_TERMINAL;
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| 154 | return failure;
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| 155 | }
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| 156 | }
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| 157 |
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| 158 | rc = fwrite(buffer, sz, nmemb, outs->stream);
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| 159 |
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| 160 | if(bytes == rc)
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| 161 | /* we added this amount of data to the output */
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| 162 | outs->bytes += bytes;
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| 163 |
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| 164 | if(config->readbusy) {
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| 165 | config->readbusy = FALSE;
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| 166 | curl_easy_pause(config->easy, CURLPAUSE_CONT);
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| 167 | }
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| 168 |
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| 169 | if(config->nobuffer) {
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| 170 | /* output buffering disabled */
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| 171 | int res = fflush(outs->stream);
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| 172 | if(res)
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| 173 | return failure;
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| 174 | }
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| 175 |
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| 176 | return rc;
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| 177 | }
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