2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation,
6 This file is part of GNU Wget.
8 GNU Wget is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at
11 your option) any later version.
13 GNU Wget is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Wget. If not, see <http://www.gnu.org/licenses/>.
21 Additional permission under GNU GPL version 3 section 7
23 If you modify this program, or any covered work, by linking or
24 combining it with the OpenSSL project's OpenSSL library (or a
25 modified version of that library), containing parts covered by the
26 terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
27 grants you additional permission to convey the resulting work.
28 Corresponding Source for a non-source form of such a combination
29 shall include the source code for the parts of OpenSSL used as well
30 as that of the covered work. */
57 /* Total size of downloaded files. Used to enforce quota. */
58 SUM_SIZE_INT total_downloaded_bytes;
60 /* Total download time in seconds. */
61 double total_download_time;
63 /* If non-NULL, the stream to which output should be written. This
64 stream is initialized when `-O' is used. */
67 /* Whether output_document is a regular file we can manipulate,
68 i.e. not `-' or a device file. */
69 bool output_stream_regular;
78 limit_bandwidth_reset (void)
83 /* Limit the bandwidth by pausing the download for an amount of time.
84 BYTES is the number of bytes received from the network, and TIMER
85 is the timer that started at the beginning of download. */
88 limit_bandwidth (wgint bytes, struct ptimer *timer)
90 double delta_t = ptimer_read (timer) - limit_data.chunk_start;
93 limit_data.chunk_bytes += bytes;
95 /* Calculate the amount of time we expect downloading the chunk
96 should take. If in reality it took less time, sleep to
97 compensate for the difference. */
98 expected = (double) limit_data.chunk_bytes / opt.limit_rate;
100 if (expected > delta_t)
102 double slp = expected - delta_t + limit_data.sleep_adjust;
106 DEBUGP (("deferring a %.2f ms sleep (%s/%.2f).\n",
107 slp * 1000, number_to_static_string (limit_data.chunk_bytes),
111 DEBUGP (("\nsleeping %.2f ms for %s bytes, adjust %.2f ms\n",
112 slp * 1000, number_to_static_string (limit_data.chunk_bytes),
113 limit_data.sleep_adjust));
115 t0 = ptimer_read (timer);
117 t1 = ptimer_measure (timer);
119 /* Due to scheduling, we probably slept slightly longer (or
120 shorter) than desired. Calculate the difference between the
121 desired and the actual sleep, and adjust the next sleep by
123 limit_data.sleep_adjust = slp - (t1 - t0);
124 /* If sleep_adjust is very large, it's likely due to suspension
125 and not clock inaccuracy. Don't enforce those. */
126 if (limit_data.sleep_adjust > 0.5)
127 limit_data.sleep_adjust = 0.5;
128 else if (limit_data.sleep_adjust < -0.5)
129 limit_data.sleep_adjust = -0.5;
132 limit_data.chunk_bytes = 0;
133 limit_data.chunk_start = ptimer_read (timer);
137 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
140 /* Write data in BUF to OUT. However, if *SKIP is non-zero, skip that
141 amount of data and decrease SKIP. Increment *TOTAL by the amount
145 write_data (FILE *out, const char *buf, int bufsize, wgint *skip,
164 fwrite (buf, 1, bufsize, out);
167 /* Immediately flush the downloaded data. This should not hinder
168 performance: fast downloads will arrive in large 16K chunks
169 (which stdio would write out immediately anyway), and slow
170 downloads wouldn't be limited by disk speed. */
173 Perhaps it shouldn't hinder performance, but it sure does, at least
174 on VMS (more than 2X). Rather than speculate on what it should or
175 shouldn't do, it might make more sense to test it. Even better, it
176 might be nice to explain what possible benefit it could offer, as
177 it appears to be a clear invitation to poor performance with no
178 actual justification. (Also, why 16K? Anyone test other values?)
182 #endif /* ndef __VMS */
183 return !ferror (out);
186 /* Read the contents of file descriptor FD until it the connection
187 terminates or a read error occurs. The data is read in portions of
188 up to 16K and written to OUT as it arrives. If opt.verbose is set,
189 the progress is shown.
191 TOREAD is the amount of data expected to arrive, normally only used
192 by the progress gauge.
194 STARTPOS is the position from which the download starts, used by
195 the progress gauge. If QTYREAD is non-NULL, the value it points to
196 is incremented by the amount of data read from the network. If
197 QTYWRITTEN is non-NULL, the value it points to is incremented by
198 the amount of data written to disk. The time it took to download
199 the data is stored to ELAPSED.
201 The function exits and returns the amount of data read. In case of
202 error while reading data, -1 is returned. In case of error while
203 writing data, -2 is returned. */
206 fd_read_body (int fd, FILE *out, wgint toread, wgint startpos,
207 wgint *qtyread, wgint *qtywritten, double *elapsed, int flags)
211 #define max(a,b) ((a) > (b) ? (a) : (b))
212 int dlbufsize = max (BUFSIZ, 8 * 1024);
213 char *dlbuf = xmalloc (dlbufsize);
215 struct ptimer *timer = NULL;
216 double last_successful_read_tm = 0;
218 /* The progress gauge, set according to the user preferences. */
219 void *progress = NULL;
221 /* Non-zero if the progress gauge is interactive, i.e. if it can
222 continually update the display. When true, smaller timeout
223 values are used so that the gauge can update the display when
224 data arrives slowly. */
225 bool progress_interactive = false;
227 bool exact = !!(flags & rb_read_exactly);
229 /* Used only by HTTP/HTTPS chunked transfer encoding. */
230 bool chunked = flags & rb_chunked_transfer_encoding;
233 /* How much data we've read/written. */
235 wgint sum_written = 0;
236 wgint remaining_chunk_size = 0;
238 if (flags & rb_skip_startpos)
243 /* If we're skipping STARTPOS bytes, pass 0 as the INITIAL
244 argument to progress_create because the indicator doesn't
245 (yet) know about "skipping" data. */
246 wgint start = skip ? 0 : startpos;
247 progress = progress_create (start, start + toread);
248 progress_interactive = progress_interactive_p (progress);
252 limit_bandwidth_reset ();
254 /* A timer is needed for tracking progress, for throttling, and for
255 tracking elapsed time. If either of these are requested, start
257 if (progress || opt.limit_rate || elapsed)
259 timer = ptimer_new ();
260 last_successful_read_tm = 0;
263 /* Use a smaller buffer for low requested bandwidths. For example,
264 with --limit-rate=2k, it doesn't make sense to slurp in 16K of
265 data and then sleep for 8s. With buffer size equal to the limit,
266 we never have to sleep for more than one second. */
267 if (opt.limit_rate && opt.limit_rate < dlbufsize)
268 dlbufsize = opt.limit_rate;
270 /* Read from FD while there is data to read. Normally toread==0
271 means that it is unknown how much data is to arrive. However, if
272 EXACT is set, then toread==0 means what it says: that no data
274 while (!exact || (sum_read < toread))
277 double tmout = opt.read_timeout;
281 if (remaining_chunk_size == 0)
283 char *line = fd_read_line (fd);
291 remaining_chunk_size = strtol (line, &endl, 16);
292 if (remaining_chunk_size == 0)
295 if (fd_read_line (fd) == NULL)
301 rdsize = MIN (remaining_chunk_size, dlbufsize);
304 rdsize = exact ? MIN (toread - sum_read, dlbufsize) : dlbufsize;
306 if (progress_interactive)
308 /* For interactive progress gauges, always specify a ~1s
309 timeout, so that the gauge can be updated regularly even
310 when the data arrives very slowly or stalls. */
312 if (opt.read_timeout)
315 waittm = ptimer_read (timer) - last_successful_read_tm;
316 if (waittm + tmout > opt.read_timeout)
318 /* Don't let total idle time exceed read timeout. */
319 tmout = opt.read_timeout - waittm;
322 /* We've already exceeded the timeout. */
323 ret = -1, errno = ETIMEDOUT;
329 ret = fd_read (fd, dlbuf, rdsize, tmout);
331 if (progress_interactive && ret < 0 && errno == ETIMEDOUT)
332 ret = 0; /* interactive timeout, handled above */
334 break; /* EOF or read error */
336 if (progress || opt.limit_rate || elapsed)
338 ptimer_measure (timer);
340 last_successful_read_tm = ptimer_read (timer);
346 if (!write_data (out, dlbuf, ret, &skip, &sum_written))
353 remaining_chunk_size -= ret;
354 if (remaining_chunk_size == 0)
355 if (fd_read_line (fd) == NULL)
364 limit_bandwidth (ret, timer);
367 progress_update (progress, ret, ptimer_read (timer));
369 if (toread > 0 && !opt.quiet)
370 ws_percenttitle (100.0 *
371 (startpos + sum_read) / (startpos + toread));
379 progress_finish (progress, ptimer_read (timer));
382 *elapsed = ptimer_read (timer);
384 ptimer_destroy (timer);
387 *qtyread += sum_read;
389 *qtywritten += sum_written;
396 /* Read a hunk of data from FD, up until a terminator. The hunk is
397 limited by whatever the TERMINATOR callback chooses as its
398 terminator. For example, if terminator stops at newline, the hunk
399 will consist of a line of data; if terminator stops at two
400 newlines, it can be used to read the head of an HTTP response.
401 Upon determining the boundary, the function returns the data (up to
402 the terminator) in malloc-allocated storage.
404 In case of read error, NULL is returned. In case of EOF and no
405 data read, NULL is returned and errno set to 0. In case of having
406 read some data, but encountering EOF before seeing the terminator,
407 the data that has been read is returned, but it will (obviously)
408 not contain the terminator.
410 The TERMINATOR function is called with three arguments: the
411 beginning of the data read so far, the beginning of the current
412 block of peeked-at data, and the length of the current block.
413 Depending on its needs, the function is free to choose whether to
414 analyze all data or just the newly arrived data. If TERMINATOR
415 returns NULL, it means that the terminator has not been seen.
416 Otherwise it should return a pointer to the charactre immediately
417 following the terminator.
419 The idea is to be able to read a line of input, or otherwise a hunk
420 of text, such as the head of an HTTP request, without crossing the
421 boundary, so that the next call to fd_read etc. reads the data
422 after the hunk. To achieve that, this function does the following:
424 1. Peek at incoming data.
426 2. Determine whether the peeked data, along with the previously
427 read data, includes the terminator.
429 2a. If yes, read the data until the end of the terminator, and
432 2b. If no, read the peeked data and goto 1.
434 The function is careful to assume as little as possible about the
435 implementation of peeking. For example, every peek is followed by
436 a read. If the read returns a different amount of data, the
437 process is retried until all data arrives safely.
439 SIZEHINT is the buffer size sufficient to hold all the data in the
440 typical case (it is used as the initial buffer size). MAXSIZE is
441 the maximum amount of memory this function is allowed to allocate,
442 or 0 if no upper limit is to be enforced.
444 This function should be used as a building block for other
445 functions -- see fd_read_line as a simple example. */
448 fd_read_hunk (int fd, hunk_terminator_t terminator, long sizehint, long maxsize)
450 long bufsize = sizehint;
451 char *hunk = xmalloc (bufsize);
452 int tail = 0; /* tail position in HUNK */
454 assert (!maxsize || maxsize >= bufsize);
459 int pklen, rdlen, remain;
461 /* First, peek at the available data. */
463 pklen = fd_peek (fd, hunk + tail, bufsize - 1 - tail, -1);
469 end = terminator (hunk, hunk + tail, pklen);
472 /* The data contains the terminator: we'll drain the data up
473 to the end of the terminator. */
474 remain = end - (hunk + tail);
475 assert (remain >= 0);
478 /* No more data needs to be read. */
482 if (bufsize - 1 < tail + remain)
484 bufsize = tail + remain + 1;
485 hunk = xrealloc (hunk, bufsize);
489 /* No terminator: simply read the data we know is (or should
493 /* Now, read the data. Note that we make no assumptions about
494 how much data we'll get. (Some TCP stacks are notorious for
495 read returning less data than the previous MSG_PEEK.) */
497 rdlen = fd_read (fd, hunk + tail, remain, 0);
510 /* EOF without anything having been read */
516 /* EOF seen: return the data we've read. */
519 if (end && rdlen == remain)
520 /* The terminator was seen and the remaining data drained --
521 we got what we came for. */
524 /* Keep looping until all the data arrives. */
526 if (tail == bufsize - 1)
528 /* Double the buffer size, but refuse to allocate more than
530 if (maxsize && bufsize >= maxsize)
537 if (maxsize && bufsize > maxsize)
539 hunk = xrealloc (hunk, bufsize);
545 line_terminator (const char *start, const char *peeked, int peeklen)
547 const char *p = memchr (peeked, '\n', peeklen);
549 /* p+1 because the line must include '\n' */
554 /* The maximum size of the single line we agree to accept. This is
555 not meant to impose an arbitrary limit, but to protect the user
556 from Wget slurping up available memory upon encountering malicious
557 or buggy server output. Define it to 0 to remove the limit. */
558 #define FD_READ_LINE_MAX 4096
560 /* Read one line from FD and return it. The line is allocated using
561 malloc, but is never larger than FD_READ_LINE_MAX.
563 If an error occurs, or if no data can be read, NULL is returned.
564 In the former case errno indicates the error condition, and in the
565 latter case, errno is NULL. */
568 fd_read_line (int fd)
570 return fd_read_hunk (fd, line_terminator, 128, FD_READ_LINE_MAX);
573 /* Return a printed representation of the download rate, along with
574 the units appropriate for the download speed. */
577 retr_rate (wgint bytes, double secs)
580 static const char *rate_names[] = {"B/s", "KB/s", "MB/s", "GB/s" };
583 double dlrate = calc_rate (bytes, secs, &units);
584 /* Use more digits for smaller numbers (regardless of unit used),
585 e.g. "1022", "247", "12.5", "2.38". */
586 sprintf (res, "%.*f %s",
587 dlrate >= 99.95 ? 0 : dlrate >= 9.995 ? 1 : 2,
588 dlrate, rate_names[units]);
593 /* Calculate the download rate and trim it as appropriate for the
594 speed. Appropriate means that if rate is greater than 1K/s,
595 kilobytes are used, and if rate is greater than 1MB/s, megabytes
598 UNITS is zero for B/s, one for KB/s, two for MB/s, and three for
602 calc_rate (wgint bytes, double secs, int *units)
610 /* If elapsed time is exactly zero, it means we're under the
611 resolution of the timer. This can easily happen on systems
612 that use time() for the timer. Since the interval lies between
613 0 and the timer's resolution, assume half the resolution. */
614 secs = ptimer_resolution () / 2.0;
616 dlrate = bytes / secs;
619 else if (dlrate < 1024.0 * 1024.0)
620 *units = 1, dlrate /= 1024.0;
621 else if (dlrate < 1024.0 * 1024.0 * 1024.0)
622 *units = 2, dlrate /= (1024.0 * 1024.0);
624 /* Maybe someone will need this, one day. */
625 *units = 3, dlrate /= (1024.0 * 1024.0 * 1024.0);
631 #define SUSPEND_POST_DATA do { \
632 post_data_suspended = true; \
633 saved_post_data = opt.post_data; \
634 saved_post_file_name = opt.post_file_name; \
635 opt.post_data = NULL; \
636 opt.post_file_name = NULL; \
639 #define RESTORE_POST_DATA do { \
640 if (post_data_suspended) \
642 opt.post_data = saved_post_data; \
643 opt.post_file_name = saved_post_file_name; \
644 post_data_suspended = false; \
648 static char *getproxy (struct url *);
650 /* Retrieve the given URL. Decides which loop to call -- HTTP, FTP,
653 /* #### This function should be rewritten so it doesn't return from
657 retrieve_url (struct url * orig_parsed, const char *origurl, char **file,
658 char **newloc, const char *refurl, int *dt, bool recursive,
659 struct iri *iri, bool register_status)
663 bool location_changed;
664 bool iri_fallbacked = 0;
666 char *mynewloc, *proxy;
667 struct url *u = orig_parsed, *proxy_url;
668 int up_error_code; /* url parse error code */
670 int redirection_count = 0;
672 bool post_data_suspended = false;
673 char *saved_post_data = NULL;
674 char *saved_post_file_name = NULL;
676 /* If dt is NULL, use local storage. */
682 url = xstrdup (origurl);
689 refurl = opt.referer;
692 /* (also for IRI fallbacking) */
699 proxy = getproxy (u);
702 struct iri *pi = iri_new ();
703 set_uri_encoding (pi, opt.locale, true);
704 pi->utf8_encode = false;
706 /* Parse the proxy URL. */
707 proxy_url = url_parse (proxy, &up_error_code, NULL, true);
710 char *error = url_error (proxy, up_error_code);
711 logprintf (LOG_NOTQUIET, _("Error parsing proxy URL %s: %s.\n"),
719 if (proxy_url->scheme != SCHEME_HTTP && proxy_url->scheme != u->scheme)
721 logprintf (LOG_NOTQUIET, _("Error in proxy URL %s: Must be HTTP.\n"), proxy);
722 url_free (proxy_url);
730 if (u->scheme == SCHEME_HTTP
732 || u->scheme == SCHEME_HTTPS
734 || (proxy_url && proxy_url->scheme == SCHEME_HTTP))
736 result = http_loop (u, orig_parsed, &mynewloc, &local_file, refurl, dt,
739 else if (u->scheme == SCHEME_FTP)
741 /* If this is a redirection, temporarily turn off opt.ftp_glob
742 and opt.recursive, both being undesirable when following
744 bool oldrec = recursive, glob = opt.ftp_glob;
745 if (redirection_count)
746 oldrec = glob = false;
748 result = ftp_loop (u, &local_file, dt, proxy_url, recursive, glob);
751 /* There is a possibility of having HTTP being redirected to
752 FTP. In these cases we must decide whether the text is HTML
753 according to the suffix. The HTML suffixes are `.html',
754 `.htm' and a few others, case-insensitive. */
755 if (redirection_count && local_file && u->scheme == SCHEME_FTP)
757 if (has_html_suffix_p (local_file))
764 url_free (proxy_url);
768 location_changed = (result == NEWLOCATION || result == NEWLOCATION_KEEP_POST);
769 if (location_changed)
771 char *construced_newloc;
772 struct url *newloc_parsed;
774 assert (mynewloc != NULL);
779 /* The HTTP specs only allow absolute URLs to appear in
780 redirects, but a ton of boneheaded webservers and CGIs out
781 there break the rules and use relative URLs, and popular
782 browsers are lenient about this, so wget should be too. */
783 construced_newloc = uri_merge (url, mynewloc);
785 mynewloc = construced_newloc;
787 /* Reset UTF-8 encoding state, keep the URI encoding and reset
788 the content encoding. */
789 iri->utf8_encode = opt.enable_iri;
790 set_content_encoding (iri, NULL);
791 xfree_null (iri->orig_url);
793 /* Now, see if this new location makes sense. */
794 newloc_parsed = url_parse (mynewloc, &up_error_code, iri, true);
797 char *error = url_error (mynewloc, up_error_code);
798 logprintf (LOG_NOTQUIET, "%s: %s.\n", escnonprint_uri (mynewloc),
800 if (orig_parsed != u)
811 /* Now mynewloc will become newloc_parsed->url, because if the
812 Location contained relative paths like .././something, we
813 don't want that propagating as url. */
815 mynewloc = xstrdup (newloc_parsed->url);
817 /* Check for max. number of redirections. */
818 if (++redirection_count > opt.max_redirect)
820 logprintf (LOG_NOTQUIET, _("%d redirections exceeded.\n"),
822 url_free (newloc_parsed);
823 if (orig_parsed != u)
836 if (orig_parsed != u)
842 /* If we're being redirected from POST, and we received a
843 redirect code different than 307, we don't want to POST
844 again. Many requests answer POST with a redirection to an
845 index page; that redirection is clearly a GET. We "suspend"
846 POST data for the duration of the redirections, and restore
849 RFC2616 HTTP/1.1 introduces code 307 Temporary Redirect
850 specifically to preserve the method of the request.
852 if (result != NEWLOCATION_KEEP_POST && !post_data_suspended)
858 /* Try to not encode in UTF-8 if fetching failed */
859 if (!(*dt & RETROKF) && iri->utf8_encode)
861 iri->utf8_encode = false;
862 if (orig_parsed != u)
866 u = url_parse (origurl, NULL, iri, true);
869 DEBUGP (("[IRI fallbacking to non-utf8 for %s\n", quote (url)));
870 url = xstrdup (u->url);
875 DEBUGP (("[Couldn't fallback to non-utf8 for %s\n", quote (url)));
878 if (local_file && u && *dt & RETROKF)
880 register_download (u->url, local_file);
882 if (!opt.spider && redirection_count && 0 != strcmp (origurl, u->url))
883 register_redirection (origurl, u->url);
886 register_html (u->url, local_file);
889 register_css (u->url, local_file);
893 *file = local_file ? local_file : NULL;
895 xfree_null (local_file);
897 if (orig_parsed != u)
902 if (redirection_count || iri_fallbacked)
920 inform_exit_status (result);
924 /* Find the URLs in the file and call retrieve_url() for each of them.
925 If HTML is true, treat the file as HTML, and construct the URLs
928 If opt.recursive is set, call retrieve_tree() for each file. */
931 retrieve_from_file (const char *file, bool html, int *count)
934 struct urlpos *url_list, *cur_url;
935 struct iri *iri = iri_new();
937 char *input_file, *url_file = NULL;
938 const char *url = file;
940 status = RETROK; /* Suppose everything is OK. */
941 *count = 0; /* Reset the URL count. */
943 /* sXXXav : Assume filename and links in the file are in the locale */
944 set_uri_encoding (iri, opt.locale, true);
945 set_content_encoding (iri, opt.locale);
947 if (url_valid_scheme (url))
951 struct url *url_parsed = url_parse (url, &url_err, iri, true);
954 char *error = url_error (url, url_err);
955 logprintf (LOG_NOTQUIET, "%s: %s.\n", url, error);
961 opt.base_href = xstrdup (url);
963 status = retrieve_url (url_parsed, url, &url_file, NULL, NULL, &dt,
965 url_free (url_parsed);
967 if (!url_file || (status != RETROK))
973 /* If we have a found a content encoding, use it.
974 * ( == is okay, because we're checking for identical object) */
975 if (iri->content_encoding != opt.locale)
976 set_uri_encoding (iri, iri->content_encoding, false);
978 /* Reset UTF-8 encode status */
979 iri->utf8_encode = opt.enable_iri;
980 xfree_null (iri->orig_url);
981 iri->orig_url = NULL;
983 input_file = url_file;
986 input_file = (char *) file;
988 url_list = (html ? get_urls_html (input_file, NULL, NULL, iri)
989 : get_urls_file (input_file));
991 xfree_null (url_file);
993 for (cur_url = url_list; cur_url; cur_url = cur_url->next, ++*count)
995 char *filename = NULL, *new_file = NULL;
997 struct iri *tmpiri = iri_dup (iri);
998 struct url *parsed_url = NULL;
1000 if (cur_url->ignore_when_downloading)
1003 if (opt.quota && total_downloaded_bytes > opt.quota)
1009 parsed_url = url_parse (cur_url->url->url, NULL, tmpiri, true);
1011 if ((opt.recursive || opt.page_requisites)
1012 && (cur_url->url->scheme != SCHEME_FTP || getproxy (cur_url->url)))
1014 int old_follow_ftp = opt.follow_ftp;
1016 /* Turn opt.follow_ftp on in case of recursive FTP retrieval */
1017 if (cur_url->url->scheme == SCHEME_FTP)
1020 status = retrieve_tree (parsed_url ? parsed_url : cur_url->url,
1023 opt.follow_ftp = old_follow_ftp;
1026 status = retrieve_url (parsed_url ? parsed_url : cur_url->url,
1027 cur_url->url->url, &filename,
1028 &new_file, NULL, &dt, opt.recursive, tmpiri,
1032 url_free (parsed_url);
1034 if (filename && opt.delete_after && file_exists_p (filename))
1037 Removing file due to --delete-after in retrieve_from_file():\n"));
1038 logprintf (LOG_VERBOSE, _("Removing %s.\n"), filename);
1039 if (unlink (filename))
1040 logprintf (LOG_NOTQUIET, "unlink: %s\n", strerror (errno));
1044 xfree_null (new_file);
1045 xfree_null (filename);
1049 /* Free the linked list of URL-s. */
1050 free_urlpos (url_list);
1057 /* Print `giving up', or `retrying', depending on the impending
1058 action. N1 and N2 are the attempt number and the attempt limit. */
1060 printwhat (int n1, int n2)
1062 logputs (LOG_VERBOSE, (n1 == n2) ? _("Giving up.\n\n") : _("Retrying.\n\n"));
1065 /* If opt.wait or opt.waitretry are specified, and if certain
1066 conditions are met, sleep the appropriate number of seconds. See
1067 the documentation of --wait and --waitretry for more information.
1069 COUNT is the count of current retrieval, beginning with 1. */
1072 sleep_between_retrievals (int count)
1074 static bool first_retrieval = true;
1076 if (first_retrieval)
1078 /* Don't sleep before the very first retrieval. */
1079 first_retrieval = false;
1083 if (opt.waitretry && count > 1)
1085 /* If opt.waitretry is specified and this is a retry, wait for
1086 COUNT-1 number of seconds, or for opt.waitretry seconds. */
1087 if (count <= opt.waitretry)
1090 xsleep (opt.waitretry);
1094 if (!opt.random_wait || count > 1)
1095 /* If random-wait is not specified, or if we are sleeping
1096 between retries of the same download, sleep the fixed
1101 /* Sleep a random amount of time averaging in opt.wait
1102 seconds. The sleeping amount ranges from 0.5*opt.wait to
1104 double waitsecs = (0.5 + random_float ()) * opt.wait;
1105 DEBUGP (("sleep_between_retrievals: avg=%f,sleep=%f\n",
1106 opt.wait, waitsecs));
1112 /* Free the linked list of urlpos. */
1114 free_urlpos (struct urlpos *l)
1118 struct urlpos *next = l->next;
1121 xfree_null (l->local_name);
1127 /* Rotate FNAME opt.backups times */
1129 rotate_backups(const char *fname)
1131 int maxlen = strlen (fname) + 1 + numdigit (opt.backups) + 1;
1132 char *from = (char *)alloca (maxlen);
1133 char *to = (char *)alloca (maxlen);
1137 if (stat (fname, &sb) == 0)
1138 if (S_ISREG (sb.st_mode) == 0)
1141 for (i = opt.backups; i > 1; i--)
1143 sprintf (from, "%s.%d", fname, i - 1);
1144 sprintf (to, "%s.%d", fname, i);
1148 sprintf (to, "%s.%d", fname, 1);
1152 static bool no_proxy_match (const char *, const char **);
1154 /* Return the URL of the proxy appropriate for url U. */
1157 getproxy (struct url *u)
1160 char *rewritten_url;
1161 static char rewritten_storage[1024];
1165 if (no_proxy_match (u->host, (const char **)opt.no_proxy))
1171 proxy = opt.http_proxy ? opt.http_proxy : getenv ("http_proxy");
1175 proxy = opt.https_proxy ? opt.https_proxy : getenv ("https_proxy");
1179 proxy = opt.ftp_proxy ? opt.ftp_proxy : getenv ("ftp_proxy");
1181 case SCHEME_INVALID:
1184 if (!proxy || !*proxy)
1187 /* Handle shorthands. `rewritten_storage' is a kludge to allow
1188 getproxy() to return static storage. */
1189 rewritten_url = rewrite_shorthand_url (proxy);
1192 strncpy (rewritten_storage, rewritten_url, sizeof (rewritten_storage));
1193 rewritten_storage[sizeof (rewritten_storage) - 1] = '\0';
1194 proxy = rewritten_storage;
1200 /* Returns true if URL would be downloaded through a proxy. */
1203 url_uses_proxy (struct url * u)
1208 ret = getproxy (u) != NULL;
1212 /* Should a host be accessed through proxy, concerning no_proxy? */
1214 no_proxy_match (const char *host, const char **no_proxy)
1219 return sufmatch (no_proxy, host);
1222 /* Set the file parameter to point to the local file string. */
1224 set_local_file (const char **file, const char *default_file)
1226 if (opt.output_document)
1228 if (output_stream_regular)
1229 *file = opt.output_document;
1232 *file = default_file;
1235 /* Return true for an input file's own URL, false otherwise. */
1237 input_file_url (const char *input_file)
1239 static bool first = true;
1242 && url_has_scheme (input_file)