2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
5 This file is part of GNU Wget.
7 GNU Wget is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or (at
10 your option) any later version.
12 GNU Wget is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Wget. If not, see <http://www.gnu.org/licenses/>.
20 Additional permission under GNU GPL version 3 section 7
22 If you modify this program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a
24 modified version of that library), containing parts covered by the
25 terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
26 grants you additional permission to convey the resulting work.
27 Corresponding Source for a non-source form of such a combination
28 shall include the source code for the parts of OpenSSL used as well
29 as that of the covered work. */
37 #endif /* HAVE_UNISTD_H */
58 /* Total size of downloaded files. Used to enforce quota. */
59 SUM_SIZE_INT total_downloaded_bytes;
61 /* Total download time in seconds. */
62 double total_download_time;
64 /* If non-NULL, the stream to which output should be written. This
65 stream is initialized when `-O' is used. */
68 /* Whether output_document is a regular file we can manipulate,
69 i.e. not `-' or a device file. */
70 bool output_stream_regular;
79 limit_bandwidth_reset (void)
84 /* Limit the bandwidth by pausing the download for an amount of time.
85 BYTES is the number of bytes received from the network, and TIMER
86 is the timer that started at the beginning of download. */
89 limit_bandwidth (wgint bytes, struct ptimer *timer)
91 double delta_t = ptimer_read (timer) - limit_data.chunk_start;
94 limit_data.chunk_bytes += bytes;
96 /* Calculate the amount of time we expect downloading the chunk
97 should take. If in reality it took less time, sleep to
98 compensate for the difference. */
99 expected = (double) limit_data.chunk_bytes / opt.limit_rate;
101 if (expected > delta_t)
103 double slp = expected - delta_t + limit_data.sleep_adjust;
107 DEBUGP (("deferring a %.2f ms sleep (%s/%.2f).\n",
108 slp * 1000, number_to_static_string (limit_data.chunk_bytes),
112 DEBUGP (("\nsleeping %.2f ms for %s bytes, adjust %.2f ms\n",
113 slp * 1000, number_to_static_string (limit_data.chunk_bytes),
114 limit_data.sleep_adjust));
116 t0 = ptimer_read (timer);
118 t1 = ptimer_measure (timer);
120 /* Due to scheduling, we probably slept slightly longer (or
121 shorter) than desired. Calculate the difference between the
122 desired and the actual sleep, and adjust the next sleep by
124 limit_data.sleep_adjust = slp - (t1 - t0);
125 /* If sleep_adjust is very large, it's likely due to suspension
126 and not clock inaccuracy. Don't enforce those. */
127 if (limit_data.sleep_adjust > 0.5)
128 limit_data.sleep_adjust = 0.5;
129 else if (limit_data.sleep_adjust < -0.5)
130 limit_data.sleep_adjust = -0.5;
133 limit_data.chunk_bytes = 0;
134 limit_data.chunk_start = ptimer_read (timer);
138 # define MIN(i, j) ((i) <= (j) ? (i) : (j))
141 /* Write data in BUF to OUT. However, if *SKIP is non-zero, skip that
142 amount of data and decrease SKIP. Increment *TOTAL by the amount
146 write_data (FILE *out, const char *buf, int bufsize, wgint *skip,
165 fwrite (buf, 1, bufsize, out);
168 /* Immediately flush the downloaded data. This should not hinder
169 performance: fast downloads will arrive in large 16K chunks
170 (which stdio would write out immediately anyway), and slow
171 downloads wouldn't be limited by disk speed. */
174 Perhaps it shouldn't hinder performance, but it sure does, at least
175 on VMS (more than 2X). Rather than speculate on what it should or
176 shouldn't do, it might make more sense to test it. Even better, it
177 might be nice to explain what possible benefit it could offer, as
178 it appears to be a clear invitation to poor performance with no
179 actual justification. (Also, why 16K? Anyone test other values?)
183 #endif /* ndef __VMS */
184 return !ferror (out);
187 /* Read the contents of file descriptor FD until it the connection
188 terminates or a read error occurs. The data is read in portions of
189 up to 16K and written to OUT as it arrives. If opt.verbose is set,
190 the progress is shown.
192 TOREAD is the amount of data expected to arrive, normally only used
193 by the progress gauge.
195 STARTPOS is the position from which the download starts, used by
196 the progress gauge. If QTYREAD is non-NULL, the value it points to
197 is incremented by the amount of data read from the network. If
198 QTYWRITTEN is non-NULL, the value it points to is incremented by
199 the amount of data written to disk. The time it took to download
200 the data is stored to ELAPSED.
202 The function exits and returns the amount of data read. In case of
203 error while reading data, -1 is returned. In case of error while
204 writing data, -2 is returned. */
207 fd_read_body (int fd, FILE *out, wgint toread, wgint startpos,
208 wgint *qtyread, wgint *qtywritten, double *elapsed, int flags)
212 int dlbufsize = BUFSIZ;
213 char *dlbuf = xmalloc (BUFSIZ);
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);
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, we don't want to POST
843 again. Many requests answer POST with a redirection to an
844 index page; that redirection is clearly a GET. We "suspend"
845 POST data for the duration of the redirections, and restore
846 it when we're done. */
847 if (!post_data_suspended)
853 /* Try to not encode in UTF-8 if fetching failed */
854 if (!(*dt & RETROKF) && iri->utf8_encode)
856 iri->utf8_encode = false;
857 if (orig_parsed != u)
861 u = url_parse (origurl, NULL, iri, true);
864 DEBUGP (("[IRI fallbacking to non-utf8 for %s\n", quote (url)));
865 url = xstrdup (u->url);
870 DEBUGP (("[Couldn't fallback to non-utf8 for %s\n", quote (url)));
873 if (local_file && u && *dt & RETROKF)
875 register_download (u->url, local_file);
877 if (redirection_count && 0 != strcmp (origurl, u->url))
878 register_redirection (origurl, u->url);
881 register_html (u->url, local_file);
884 register_css (u->url, local_file);
888 *file = local_file ? local_file : NULL;
890 xfree_null (local_file);
892 if (orig_parsed != u)
897 if (redirection_count || iri_fallbacked)
915 inform_exit_status (result);
919 /* Find the URLs in the file and call retrieve_url() for each of them.
920 If HTML is true, treat the file as HTML, and construct the URLs
923 If opt.recursive is set, call retrieve_tree() for each file. */
926 retrieve_from_file (const char *file, bool html, int *count)
929 struct urlpos *url_list, *cur_url;
930 struct iri *iri = iri_new();
932 char *input_file, *url_file = NULL;
933 const char *url = file;
935 status = RETROK; /* Suppose everything is OK. */
936 *count = 0; /* Reset the URL count. */
938 /* sXXXav : Assume filename and links in the file are in the locale */
939 set_uri_encoding (iri, opt.locale, true);
940 set_content_encoding (iri, opt.locale);
942 if (url_valid_scheme (url))
946 struct url * url_parsed = url_parse(url, &url_err, iri, true);
950 char *error = url_error (url, url_err);
951 logprintf (LOG_NOTQUIET, "%s: %s.\n", url, error);
957 opt.base_href = xstrdup (url);
959 status = retrieve_url (url_parsed, url, &url_file, NULL, NULL, &dt,
961 url_free (url_parsed);
963 if (!url_file || (status != RETROK))
969 /* If we have a found a content encoding, use it.
970 * ( == is okay, because we're checking for identical object) */
971 if (iri->content_encoding != opt.locale)
972 set_uri_encoding (iri, iri->content_encoding, false);
974 /* Reset UTF-8 encode status */
975 iri->utf8_encode = opt.enable_iri;
976 xfree_null (iri->orig_url);
977 iri->orig_url = NULL;
979 input_file = url_file;
982 input_file = (char *) file;
984 url_list = (html ? get_urls_html (input_file, NULL, NULL, iri)
985 : get_urls_file (input_file));
987 xfree_null (url_file);
989 for (cur_url = url_list; cur_url; cur_url = cur_url->next, ++*count)
991 char *filename = NULL, *new_file = NULL;
993 struct iri *tmpiri = iri_dup (iri);
994 struct url *parsed_url = NULL;
996 if (cur_url->ignore_when_downloading)
999 if (opt.quota && total_downloaded_bytes > opt.quota)
1005 /* Need to reparse the url, since it didn't have iri information. */
1007 parsed_url = url_parse (cur_url->url->url, NULL, tmpiri, true);
1009 if ((opt.recursive || opt.page_requisites)
1010 && (cur_url->url->scheme != SCHEME_FTP || getproxy (cur_url->url)))
1012 int old_follow_ftp = opt.follow_ftp;
1014 /* Turn opt.follow_ftp on in case of recursive FTP retrieval */
1015 if (cur_url->url->scheme == SCHEME_FTP)
1018 status = retrieve_tree (parsed_url ? parsed_url : cur_url->url,
1021 opt.follow_ftp = old_follow_ftp;
1024 status = retrieve_url (parsed_url ? parsed_url : cur_url->url,
1025 cur_url->url->url, &filename,
1026 &new_file, NULL, &dt, opt.recursive, tmpiri,
1030 url_free (parsed_url);
1032 if (filename && opt.delete_after && file_exists_p (filename))
1035 Removing file due to --delete-after in retrieve_from_file():\n"));
1036 logprintf (LOG_VERBOSE, _("Removing %s.\n"), filename);
1037 if (unlink (filename))
1038 logprintf (LOG_NOTQUIET, "unlink: %s\n", strerror (errno));
1042 xfree_null (new_file);
1043 xfree_null (filename);
1047 /* Free the linked list of URL-s. */
1048 free_urlpos (url_list);
1055 /* Print `giving up', or `retrying', depending on the impending
1056 action. N1 and N2 are the attempt number and the attempt limit. */
1058 printwhat (int n1, int n2)
1060 logputs (LOG_VERBOSE, (n1 == n2) ? _("Giving up.\n\n") : _("Retrying.\n\n"));
1063 /* If opt.wait or opt.waitretry are specified, and if certain
1064 conditions are met, sleep the appropriate number of seconds. See
1065 the documentation of --wait and --waitretry for more information.
1067 COUNT is the count of current retrieval, beginning with 1. */
1070 sleep_between_retrievals (int count)
1072 static bool first_retrieval = true;
1074 if (first_retrieval)
1076 /* Don't sleep before the very first retrieval. */
1077 first_retrieval = false;
1081 if (opt.waitretry && count > 1)
1083 /* If opt.waitretry is specified and this is a retry, wait for
1084 COUNT-1 number of seconds, or for opt.waitretry seconds. */
1085 if (count <= opt.waitretry)
1088 xsleep (opt.waitretry);
1092 if (!opt.random_wait || count > 1)
1093 /* If random-wait is not specified, or if we are sleeping
1094 between retries of the same download, sleep the fixed
1099 /* Sleep a random amount of time averaging in opt.wait
1100 seconds. The sleeping amount ranges from 0.5*opt.wait to
1102 double waitsecs = (0.5 + random_float ()) * opt.wait;
1103 DEBUGP (("sleep_between_retrievals: avg=%f,sleep=%f\n",
1104 opt.wait, waitsecs));
1110 /* Free the linked list of urlpos. */
1112 free_urlpos (struct urlpos *l)
1116 struct urlpos *next = l->next;
1119 xfree_null (l->local_name);
1125 /* Rotate FNAME opt.backups times */
1127 rotate_backups(const char *fname)
1129 int maxlen = strlen (fname) + 1 + numdigit (opt.backups) + 1;
1130 char *from = (char *)alloca (maxlen);
1131 char *to = (char *)alloca (maxlen);
1135 if (stat (fname, &sb) == 0)
1136 if (S_ISREG (sb.st_mode) == 0)
1139 for (i = opt.backups; i > 1; i--)
1141 sprintf (from, "%s.%d", fname, i - 1);
1142 sprintf (to, "%s.%d", fname, i);
1146 sprintf (to, "%s.%d", fname, 1);
1150 static bool no_proxy_match (const char *, const char **);
1152 /* Return the URL of the proxy appropriate for url U. */
1155 getproxy (struct url *u)
1158 char *rewritten_url;
1159 static char rewritten_storage[1024];
1163 if (no_proxy_match (u->host, (const char **)opt.no_proxy))
1169 proxy = opt.http_proxy ? opt.http_proxy : getenv ("http_proxy");
1173 proxy = opt.https_proxy ? opt.https_proxy : getenv ("https_proxy");
1177 proxy = opt.ftp_proxy ? opt.ftp_proxy : getenv ("ftp_proxy");
1179 case SCHEME_INVALID:
1182 if (!proxy || !*proxy)
1185 /* Handle shorthands. `rewritten_storage' is a kludge to allow
1186 getproxy() to return static storage. */
1187 rewritten_url = rewrite_shorthand_url (proxy);
1190 strncpy (rewritten_storage, rewritten_url, sizeof (rewritten_storage));
1191 rewritten_storage[sizeof (rewritten_storage) - 1] = '\0';
1192 proxy = rewritten_storage;
1198 /* Returns true if URL would be downloaded through a proxy. */
1201 url_uses_proxy (struct url * u)
1206 ret = getproxy (u) != NULL;
1210 /* Should a host be accessed through proxy, concerning no_proxy? */
1212 no_proxy_match (const char *host, const char **no_proxy)
1217 return sufmatch (no_proxy, host);
1220 /* Set the file parameter to point to the local file string. */
1222 set_local_file (const char **file, const char *default_file)
1224 if (opt.output_document)
1226 if (output_stream_regular)
1227 *file = opt.output_document;
1230 *file = default_file;
1233 /* Return true for an input file's own URL, false otherwise. */
1235 input_file_url (const char *input_file)
1237 static bool first = true;
1240 && url_has_scheme (input_file)