1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 #include "tool_setup.h"
25
26 #ifdef HAVE_SYS_SELECT_H
27 #include <sys/select.h>
28 #endif
29
30 #define ENABLE_CURLX_PRINTF
31 /* use our own printf() functions */
32 #include "curlx.h"
33
34 #include "tool_cfgable.h"
35 #include "tool_cb_rea.h"
36 #include "tool_operate.h"
37 #include "tool_util.h"
38 #include "tool_msgs.h"
39
40 #include "memdebug.h" /* keep this as LAST include */
41
42 /*
43 ** callback for CURLOPT_READFUNCTION
44 */
45
tool_read_cb(char * buffer,size_t sz,size_t nmemb,void * userdata)46 size_t tool_read_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
47 {
48 ssize_t rc = 0;
49 struct per_transfer *per = userdata;
50 struct OperationConfig *config = per->config;
51
52 if((per->uploadfilesize != -1) &&
53 (per->uploadedsofar == per->uploadfilesize)) {
54 /* done */
55 return 0;
56 }
57
58 if(config->timeout_ms) {
59 struct timeval now = tvnow();
60 long msdelta = tvdiff(now, per->start);
61
62 if(msdelta > config->timeout_ms)
63 /* timeout */
64 return 0;
65 #ifndef _WIN32
66 /* this logic waits on read activity on a file descriptor that is not a
67 socket which makes it not work with select() on Windows */
68 else {
69 fd_set bits;
70 struct timeval timeout;
71 long wait = config->timeout_ms - msdelta;
72
73 /* wait this long at the most */
74 timeout.tv_sec = wait/1000;
75 timeout.tv_usec = (int)((wait%1000)*1000);
76
77 FD_ZERO(&bits);
78 FD_SET(per->infd, &bits);
79 if(!select(per->infd + 1, &bits, NULL, NULL, &timeout))
80 return 0; /* timeout */
81 }
82 #endif
83 }
84
85 rc = read(per->infd, buffer, sz*nmemb);
86 if(rc < 0) {
87 if(errno == EAGAIN) {
88 errno = 0;
89 config->readbusy = TRUE;
90 return CURL_READFUNC_PAUSE;
91 }
92 /* since size_t is unsigned we can't return negative values fine */
93 rc = 0;
94 }
95 if((per->uploadfilesize != -1) &&
96 (per->uploadedsofar + rc > per->uploadfilesize)) {
97 /* do not allow uploading more than originally set out to do */
98 curl_off_t delta = per->uploadedsofar + rc - per->uploadfilesize;
99 warnf(per->config->global, "File size larger in the end than when "
100 "started. Dropping at least %" CURL_FORMAT_CURL_OFF_T " bytes",
101 delta);
102 rc = (ssize_t)(per->uploadfilesize - per->uploadedsofar);
103 }
104 config->readbusy = FALSE;
105
106 /* when select() returned zero here, it timed out */
107 return (size_t)rc;
108 }
109
110 /*
111 ** callback for CURLOPT_XFERINFOFUNCTION used to unpause busy reads
112 */
113
tool_readbusy_cb(void * clientp,curl_off_t dltotal,curl_off_t dlnow,curl_off_t ultotal,curl_off_t ulnow)114 int tool_readbusy_cb(void *clientp,
115 curl_off_t dltotal, curl_off_t dlnow,
116 curl_off_t ultotal, curl_off_t ulnow)
117 {
118 struct per_transfer *per = clientp;
119 struct OperationConfig *config = per->config;
120
121 (void)dltotal; /* unused */
122 (void)dlnow; /* unused */
123 (void)ultotal; /* unused */
124 (void)ulnow; /* unused */
125
126 if(config->readbusy) {
127 config->readbusy = FALSE;
128 curl_easy_pause(per->curl, CURLPAUSE_CONT);
129 }
130
131 return per->noprogress? 0 : CURL_PROGRESSFUNC_CONTINUE;
132 }
133