2 Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
4 This file is part of Wget.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include <sys/types.h>
36 #if TIME_WITH_SYS_TIME
37 # include <sys/time.h>
41 # include <sys/time.h>
65 extern char *version_string;
75 #define TEXTHTML_S "text/html"
76 #define HTTP_ACCEPT "*/*"
78 /* Some status code validation macros: */
79 #define H_20X(x) (((x) >= 200) && ((x) < 300))
80 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
81 #define H_REDIRECTED(x) (((x) == HTTP_STATUS_MOVED_PERMANENTLY) \
82 || ((x) == HTTP_STATUS_MOVED_TEMPORARILY))
84 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
86 #define HTTP_STATUS_OK 200
87 #define HTTP_STATUS_CREATED 201
88 #define HTTP_STATUS_ACCEPTED 202
89 #define HTTP_STATUS_NO_CONTENT 204
90 #define HTTP_STATUS_PARTIAL_CONTENTS 206
92 /* Redirection 3xx. */
93 #define HTTP_STATUS_MULTIPLE_CHOICES 300
94 #define HTTP_STATUS_MOVED_PERMANENTLY 301
95 #define HTTP_STATUS_MOVED_TEMPORARILY 302
96 #define HTTP_STATUS_NOT_MODIFIED 304
98 /* Client error 4xx. */
99 #define HTTP_STATUS_BAD_REQUEST 400
100 #define HTTP_STATUS_UNAUTHORIZED 401
101 #define HTTP_STATUS_FORBIDDEN 403
102 #define HTTP_STATUS_NOT_FOUND 404
104 /* Server errors 5xx. */
105 #define HTTP_STATUS_INTERNAL 500
106 #define HTTP_STATUS_NOT_IMPLEMENTED 501
107 #define HTTP_STATUS_BAD_GATEWAY 502
108 #define HTTP_STATUS_UNAVAILABLE 503
111 /* Parse the HTTP status line, which is of format:
113 HTTP-Version SP Status-Code SP Reason-Phrase
115 The function returns the status-code, or -1 if the status line is
116 malformed. The pointer to reason-phrase is returned in RP. */
118 parse_http_status_line (const char *line, const char **reason_phrase_ptr)
120 /* (the variables must not be named `major' and `minor', because
121 that breaks compilation with SunOS4 cc.) */
122 int mjr, mnr, statcode;
125 *reason_phrase_ptr = NULL;
127 /* The standard format of HTTP-Version is: `HTTP/X.Y', where X is
128 major version, and Y is minor version. */
129 if (strncmp (line, "HTTP/", 5) != 0)
133 /* Calculate major HTTP version. */
135 for (mjr = 0; ISDIGIT (*line); line++)
136 mjr = 10 * mjr + (*line - '0');
137 if (*line != '.' || p == line)
141 /* Calculate minor HTTP version. */
143 for (mnr = 0; ISDIGIT (*line); line++)
144 mnr = 10 * mnr + (*line - '0');
145 if (*line != ' ' || p == line)
147 /* Wget will accept only 1.0 and higher HTTP-versions. The value of
148 minor version can be safely ignored. */
153 /* Calculate status code. */
154 if (!(ISDIGIT (*line) && ISDIGIT (line[1]) && ISDIGIT (line[2])))
156 statcode = 100 * (*line - '0') + 10 * (line[1] - '0') + (line[2] - '0');
158 /* Set up the reason phrase pointer. */
160 /* RFC2068 requires SPC here, but we allow the string to finish
161 here, in case no reason-phrase is present. */
165 *reason_phrase_ptr = line;
170 *reason_phrase_ptr = line + 1;
175 /* Functions to be used as arguments to header_process(): */
177 struct http_process_range_closure {
183 /* Parse the `Content-Range' header and extract the information it
184 contains. Returns 1 if successful, -1 otherwise. */
186 http_process_range (const char *hdr, void *arg)
188 struct http_process_range_closure *closure
189 = (struct http_process_range_closure *)arg;
192 /* Certain versions of Nutscape proxy server send out
193 `Content-Length' without "bytes" specifier, which is a breach of
194 RFC2068 (as well as the HTTP/1.1 draft which was current at the
195 time). But hell, I must support it... */
196 if (!strncasecmp (hdr, "bytes", 5))
199 hdr += skip_lws (hdr);
205 for (num = 0; ISDIGIT (*hdr); hdr++)
206 num = 10 * num + (*hdr - '0');
207 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
209 closure->first_byte_pos = num;
211 for (num = 0; ISDIGIT (*hdr); hdr++)
212 num = 10 * num + (*hdr - '0');
213 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
215 closure->last_byte_pos = num;
217 for (num = 0; ISDIGIT (*hdr); hdr++)
218 num = 10 * num + (*hdr - '0');
219 closure->entity_length = num;
223 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
224 Used for `Accept-Ranges'. */
226 http_process_none (const char *hdr, void *arg)
228 int *where = (int *)arg;
230 if (strstr (hdr, "none"))
237 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
239 http_process_type (const char *hdr, void *arg)
241 char **result = (char **)arg;
244 p = strrchr (hdr, ';');
248 *result = (char *)xmalloc (len + 1);
249 memcpy (*result, hdr, len);
250 (*result)[len] = '\0';
253 *result = xstrdup (hdr);
260 long len; /* received length */
261 long contlen; /* expected length */
262 long restval; /* the restart value */
263 int res; /* the result of last read */
264 char *newloc; /* new location (redirection) */
265 char *remote_time; /* remote time-stamp string */
266 char *error; /* textual HTTP error */
267 int statcode; /* status code */
268 long dltime; /* time of the download */
271 /* Free the elements of hstat X. */
272 #define FREEHSTAT(x) do \
274 FREE_MAYBE ((x).newloc); \
275 FREE_MAYBE ((x).remote_time); \
276 FREE_MAYBE ((x).error); \
277 (x).newloc = (x).remote_time = (x).error = NULL; \
280 static char *create_authorization_line PARAMS ((const char *, const char *,
281 const char *, const char *,
283 static char *basic_authentication_encode PARAMS ((const char *, const char *,
285 static int known_authentication_scheme_p PARAMS ((const char *));
287 static time_t http_atotm PARAMS ((char *));
289 /* Retrieve a document through HTTP protocol. It recognizes status
290 code, and correctly handles redirections. It closes the network
291 socket. If it receives an error from the functions below it, it
292 will print it if there is enough information to do so (almost
293 always), returning the error to the caller (i.e. http_loop).
295 Various HTTP parameters are stored to hs. Although it parses the
296 response code correctly, it is not used in a sane way. The caller
299 If u->proxy is non-NULL, the URL u will be taken as a proxy URL,
300 and u->proxy->url will be given to the proxy server (bad naming,
303 gethttp (struct urlinfo *u, struct http_stat *hs, int *dt)
305 char *request, *type, *command, *path;
307 char *pragma_h, *referer, *useragent, *range, *wwwauth, *remhost;
308 char *authenticate_h;
313 int sock, hcount, num_written, all_length, remport, statcode;
314 long contlen, contrange;
318 int auth_tried_already;
321 if (!(*dt & HEAD_ONLY))
322 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
323 know the local filename so we can save to it. */
324 assert (u->local != NULL);
327 auth_tried_already = 0;
330 /* We need to come back here when the initial attempt to retrieve
331 without authorization header fails. */
333 /* Initialize certain elements of struct http_stat. */
338 hs->remote_time = NULL;
341 /* Which structure to use to retrieve the original URL data. */
347 /* First: establish the connection. */
348 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "), u->host, u->port);
349 err = make_connection (&sock, u->host, u->port);
353 logputs (LOG_VERBOSE, "\n");
354 logprintf (LOG_NOTQUIET, "%s: %s.\n", u->host, herrmsg (h_errno));
358 logputs (LOG_VERBOSE, "\n");
359 logprintf (LOG_NOTQUIET, "socket: %s\n", strerror (errno));
363 logputs (LOG_VERBOSE, "\n");
364 logprintf (LOG_NOTQUIET,
365 _("Connection to %s:%hu refused.\n"), u->host, u->port);
369 logputs (LOG_VERBOSE, "\n");
370 logprintf (LOG_NOTQUIET, "connect: %s\n", strerror (errno));
375 /* Everything is fine! */
376 logputs (LOG_VERBOSE, _("connected!\n"));
384 path = u->proxy->url;
388 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
392 referer = (char *)alloca (9 + strlen (ou->referer) + 3);
393 sprintf (referer, "Referer: %s\r\n", ou->referer);
395 if (*dt & SEND_NOCACHE)
396 pragma_h = "Pragma: no-cache\r\n";
401 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
402 /* #### Gag me! Some servers (e.g. WebSitePro) have been known
403 to misinterpret the following `Range' format, and return the
404 document as multipart/x-byte-ranges MIME type!
406 #### TODO: Interpret MIME types, recognize bullshits similar
407 the one described above, and deal with them! */
408 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
413 STRDUP_ALLOCA (useragent, opt.useragent);
416 useragent = (char *)alloca (10 + strlen (version_string));
417 sprintf (useragent, "Wget/%s", version_string);
419 /* Construct the authentication, if userid is present. */
422 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
423 user = user ? user : opt.http_user;
424 passwd = passwd ? passwd : opt.http_passwd;
427 if (authenticate_h && user && passwd)
429 wwwauth = create_authorization_line (authenticate_h, user, passwd,
436 char *proxy_user, *proxy_passwd;
437 /* For normal username and password, URL components override
438 command-line/wgetrc parameters. With proxy authentication,
439 it's the reverse, because proxy URLs are normally the
440 "permanent" ones, so command-line args should take
442 if (opt.proxy_user && opt.proxy_passwd)
444 proxy_user = opt.proxy_user;
445 proxy_passwd = opt.proxy_passwd;
449 proxy_user = u->user;
450 proxy_passwd = u->passwd;
452 /* #### This is junky. Can't the proxy request, say, `Digest'
454 if (proxy_user && proxy_passwd)
455 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
456 "Proxy-Authorization");
468 host_port = (char *)alloca (numdigit (remport) + 2);
469 host_port_len = sprintf (host_port, ":%d", remport);
472 /* Allocate the memory for the request. */
473 request = (char *)alloca (strlen (command) + strlen (path)
475 + strlen (remhost) + host_port_len
476 + strlen (HTTP_ACCEPT)
477 + (referer ? strlen (referer) : 0)
478 + (wwwauth ? strlen (wwwauth) : 0)
479 + (proxyauth ? strlen (proxyauth) : 0)
480 + (range ? strlen (range) : 0)
482 + (opt.user_header ? strlen (opt.user_header) : 0)
484 /* Construct the request. */
491 command, path, useragent, remhost,
492 host_port ? host_port : "",
493 HTTP_ACCEPT, referer ? referer : "",
494 wwwauth ? wwwauth : "",
495 proxyauth ? proxyauth : "",
498 opt.user_header ? opt.user_header : "");
499 DEBUGP (("---request begin---\n%s---request end---\n", request));
500 /* Free the temporary memory. */
501 FREE_MAYBE (wwwauth);
502 FREE_MAYBE (proxyauth);
504 /* Send the request to server. */
505 num_written = iwrite (sock, request, strlen (request));
508 logputs (LOG_VERBOSE, _("Failed writing HTTP request.\n"));
512 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
513 u->proxy ? "Proxy" : "HTTP");
514 contlen = contrange = -1;
519 /* Before reading anything, initialize the rbuf. */
520 rbuf_initialize (&rbuf, sock);
524 /* Header-fetching loop. */
532 /* Get the header. */
533 status = header_get (&rbuf, &hdr,
534 /* Disallow continuations for status line. */
535 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
537 /* Check for errors. */
538 if (status == HG_EOF && *hdr)
540 /* This used to be an unconditional error, but that was
541 somewhat controversial, because of a large number of
542 broken CGI's that happily "forget" to send the second EOL
543 before closing the connection of a HEAD request.
545 So, the deal is to check whether the header is empty
546 (*hdr is zero if it is); if yes, it means that the
547 previous header was fully retrieved, and that -- most
548 probably -- the request is complete. "...be liberal in
549 what you accept." Oh boy. */
550 logputs (LOG_VERBOSE, "\n");
551 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
554 FREE_MAYBE (hs->newloc);
555 FREE_MAYBE (all_headers);
559 else if (status == HG_ERROR)
561 logputs (LOG_VERBOSE, "\n");
562 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
566 FREE_MAYBE (hs->newloc);
567 FREE_MAYBE (all_headers);
572 /* If the headers are to be saved to a file later, save them to
574 if (opt.save_headers)
576 int lh = strlen (hdr);
577 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
578 memcpy (all_headers + all_length, hdr, lh);
580 all_headers[all_length++] = '\n';
581 all_headers[all_length] = '\0';
584 /* Print the header if requested. */
585 if (opt.server_response && hcount != 1)
586 logprintf (LOG_VERBOSE, "\n%d %s", hcount, hdr);
588 /* Check for status line. */
592 /* Parse the first line of server response. */
593 statcode = parse_http_status_line (hdr, &error);
594 hs->statcode = statcode;
595 /* Store the descriptive response. */
596 if (statcode == -1) /* malformed response */
598 /* A common reason for "malformed response" error is the
599 case when no data was actually received. Handle this
602 hs->error = xstrdup (_("No data received"));
604 hs->error = xstrdup (_("Malformed status line"));
609 hs->error = xstrdup (_("(no description)"));
611 hs->error = xstrdup (error);
618 logprintf (LOG_VERBOSE, "%d %s", statcode, error);
623 /* Exit on empty header. */
630 /* Try getting content-length. */
631 if (contlen == -1 && !opt.ignore_length)
632 if (header_process (hdr, "Content-Length", header_extract_number,
635 /* Try getting content-type. */
637 if (header_process (hdr, "Content-Type", http_process_type, &type))
639 /* Try getting location. */
641 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
643 /* Try getting last-modified. */
644 if (!hs->remote_time)
645 if (header_process (hdr, "Last-Modified", header_strdup,
648 /* Try getting www-authentication. */
650 if (header_process (hdr, "WWW-Authenticate", header_strdup,
653 /* Check for accept-ranges header. If it contains the word
654 `none', disable the ranges. */
655 if (*dt & ACCEPTRANGES)
658 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
661 *dt &= ~ACCEPTRANGES;
665 /* Try getting content-range. */
668 struct http_process_range_closure closure;
669 if (header_process (hdr, "Content-Range", http_process_range, &closure))
671 contrange = closure.first_byte_pos;
679 logputs (LOG_VERBOSE, "\n");
681 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
684 /* Authorization is required. */
689 if (auth_tried_already)
691 /* If we have tried it already, then there is not point
693 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
694 free (authenticate_h);
697 else if (!known_authentication_scheme_p (authenticate_h))
699 free (authenticate_h);
700 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
705 auth_tried_already = 1;
709 /* We do not need this anymore. */
712 free (authenticate_h);
713 authenticate_h = NULL;
716 /* 20x responses are counted among successful by default. */
717 if (H_20X (statcode))
720 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
723 /* We don't assume text/html by default. */
726 if (opt.html_extension && (*dt & TEXTHTML))
727 /* -E / --html-extension / html_extension = on was specified, and this is a
728 text/html file. If some case-insensitive variation on ".htm[l]" isn't
729 already the file's suffix, tack on ".html". */
731 char* last_period_in_local_filename = strrchr(u->local, '.');
733 if (last_period_in_local_filename == NULL ||
734 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
735 strcasecmp(last_period_in_local_filename, ".html") == EQ))
737 size_t local_filename_len = strlen(u->local);
739 u->local = xrealloc(u->local, local_filename_len + sizeof(".html"));
740 strcpy(u->local + local_filename_len, ".html");
742 *dt |= ADDED_HTML_EXTENSION;
748 else if (contrange != hs->restval ||
749 (H_PARTIAL (statcode) && contrange == -1))
751 /* This means the whole request was somehow misunderstood by the
754 FREE_MAYBE (hs->newloc);
755 FREE_MAYBE (all_headers);
763 contlen += contrange;
765 contrange = -1; /* If conent-length was not sent,
766 content-range will be ignored. */
768 hs->contlen = contlen;
770 /* Return if redirected. */
771 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
773 /* RFC2068 says that in case of the 300 (multiple choices)
774 response, the server can output a preferred URL through
775 `Location' header; otherwise, the request should be treated
776 like GET. So, if the location is set, it will be a
777 redirection; otherwise, just proceed normally. */
778 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
782 logprintf (LOG_VERBOSE,
783 _("Location: %s%s\n"),
784 hs->newloc ? hs->newloc : _("unspecified"),
785 hs->newloc ? _(" [following]") : "");
788 FREE_MAYBE (all_headers);
794 if ((*dt & RETROKF) && !opt.server_response)
796 /* No need to print this output if the body won't be
797 downloaded at all, or if the original server response is
799 logputs (LOG_VERBOSE, _("Length: "));
802 logputs (LOG_VERBOSE, legible (contlen));
804 logprintf (LOG_VERBOSE, _(" (%s to go)"),
805 legible (contlen - contrange));
808 logputs (LOG_VERBOSE,
809 opt.ignore_length ? _("ignored") : _("unspecified"));
811 logprintf (LOG_VERBOSE, " [%s]\n", type);
813 logputs (LOG_VERBOSE, "\n");
817 type = NULL; /* We don't need it any more. */
819 /* Return if we have no intention of further downloading. */
820 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
822 /* In case someone cares to look... */
826 FREE_MAYBE (all_headers);
831 /* Open the local file. */
834 mkalldirs (u->local);
836 rotate_backups (u->local);
837 fp = fopen (u->local, hs->restval ? "ab" : "wb");
840 logprintf (LOG_NOTQUIET, "%s: %s\n", u->local, strerror (errno));
842 FREE_MAYBE (all_headers);
851 /* This will silently fail for streams that don't correspond
852 to regular files, but that's OK. */
858 /* #### This confuses the code that checks for file size. There
859 should be some overhead information. */
860 if (opt.save_headers)
861 fwrite (all_headers, 1, all_length, fp);
863 /* Get the contents of the document. */
864 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
865 (contlen != -1 ? contlen : 0),
867 hs->dltime = elapsed_time ();
869 /* Close or flush the file. We have to be careful to check for
870 error here. Checking the result of fwrite() is not enough --
871 errors could go unnoticed! */
874 flush_res = fclose (fp);
876 flush_res = fflush (fp);
877 if (flush_res == EOF)
880 FREE_MAYBE (all_headers);
887 /* The genuine HTTP loop! This is the part where the retrieval is
888 retried, and retried, and retried, and... */
890 http_loop (struct urlinfo *u, char **newloc, int *dt)
892 static int first_retrieval = 1;
895 int use_ts, got_head = 0; /* time-stamping info */
896 char *filename_plus_orig_suffix;
897 char *local_filename = NULL;
898 char *tms, *suf, *locf, *tmrate;
900 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
901 long local_size = 0; /* the size of the local file */
903 struct http_stat hstat; /* HTTP status */
908 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
909 has_wildcards_p because it would also warn on `?', and we know that
910 shows up in CGI paths a *lot*. */
911 if (strchr (u->url, '*'))
912 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
914 /* Determine the local filename. */
916 u->local = url_filename (u->proxy ? u->proxy : u);
918 if (!opt.output_document)
921 locf = opt.output_document;
923 /* Yuck. Multiple returns suck. We need to remember to free() the space we
924 xmalloc() here before EACH return. This is one reason it's better to set
925 flags that influence flow control and then return once at the end. */
926 filename_len = strlen(u->local);
927 filename_plus_orig_suffix = xmalloc(filename_len + sizeof(".orig"));
929 if (opt.noclobber && file_exists_p (u->local))
931 /* If opt.noclobber is turned on and file already exists, do not
933 logprintf (LOG_VERBOSE, _("\
934 File `%s' already there, will not retrieve.\n"), u->local);
935 /* If the file is there, we suppose it's retrieved OK. */
938 /* #### Bogusness alert. */
939 /* If its suffix is "html" or (yuck!) "htm", we suppose it's
940 text/html, a harmless lie. */
941 if (((suf = suffix (u->local)) != NULL)
942 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
945 free(filename_plus_orig_suffix); /* must precede every return! */
946 /* Another harmless lie: */
951 if (opt.timestamping)
953 boolean local_dot_orig_file_exists = FALSE;
955 if (opt.backup_converted)
956 /* If -K is specified, we'll act on the assumption that it was specified
957 last time these files were downloaded as well, and instead of just
958 comparing local file X against server file X, we'll compare local
959 file X.orig (if extant, else X) against server file X. If -K
960 _wasn't_ specified last time, or the server contains files called
961 *.orig, -N will be back to not operating correctly with -k. */
963 /* Would a single s[n]printf() call be faster? */
964 strcpy(filename_plus_orig_suffix, u->local);
965 strcpy(filename_plus_orig_suffix + filename_len, ".orig");
967 /* Try to stat() the .orig file. */
968 if (stat(filename_plus_orig_suffix, &st) == 0)
970 local_dot_orig_file_exists = TRUE;
971 local_filename = filename_plus_orig_suffix;
975 if (!local_dot_orig_file_exists)
976 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
977 if (stat (u->local, &st) == 0)
978 local_filename = u->local;
980 if (local_filename != NULL)
981 /* There was a local file, so we'll check later to see if the version
982 the server has is the same version we already have, allowing us to
987 local_size = st.st_size;
991 /* Reset the counter. */
993 *dt = 0 | ACCEPTRANGES;
997 /* Increment the pass counter. */
999 /* Wait before the retrieval (unless this is the very first
1001 Check if we are retrying or not, wait accordingly - HEH */
1002 if (!first_retrieval && (opt.wait || (count && opt.waitretry)))
1006 if (count<opt.waitretry)
1009 sleep(opt.waitretry);
1014 if (first_retrieval)
1015 first_retrieval = 0;
1016 /* Get the current time string. */
1017 tms = time_str (NULL);
1018 /* Print fetch message, if opt.verbose. */
1021 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1025 sprintf (tmp, _("(try:%2d)"), count);
1026 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1027 tms, hurl, tmp, locf);
1029 ws_changetitle (hurl, 1);
1034 /* Default document type is empty. However, if spider mode is
1035 on or time-stamping is employed, HEAD_ONLY commands is
1036 encoded within *dt. */
1037 if (opt.spider || (use_ts && !got_head))
1041 /* Assume no restarting. */
1043 /* Decide whether or not to restart. */
1044 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1045 && file_exists_p (u->local))
1046 if (stat (u->local, &st) == 0)
1047 hstat.restval = st.st_size;
1048 /* Decide whether to send the no-cache directive. */
1049 if (u->proxy && (count > 1 || (opt.proxy_cache == 0)))
1050 *dt |= SEND_NOCACHE;
1052 *dt &= ~SEND_NOCACHE;
1054 /* Try fetching the document, or at least its head. :-) */
1055 err = gethttp (u, &hstat, dt);
1057 /* It's unfortunate that wget determines the local filename before finding
1058 out the Content-Type of the file. Barring a major restructuring of the
1059 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1060 u->local to tack on ".html". */
1061 if (!opt.output_document)
1064 locf = opt.output_document;
1067 tms = time_str (NULL);
1068 /* Get the new location (with or without the redirection). */
1070 *newloc = xstrdup (hstat.newloc);
1073 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1074 case CONERROR: case READERR: case WRITEFAILED:
1076 /* Non-fatal errors continue executing the loop, which will
1077 bring them to "while" statement at the end, to judge
1078 whether the number of tries was exceeded. */
1080 printwhat (count, opt.ntry);
1083 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1084 /* Fatal errors just return from the function. */
1086 free(filename_plus_orig_suffix); /* must precede every return! */
1089 case FWRITEERR: case FOPENERR:
1090 /* Another fatal error. */
1091 logputs (LOG_VERBOSE, "\n");
1092 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1093 u->local, strerror (errno));
1095 free(filename_plus_orig_suffix); /* must precede every return! */
1099 /* Return the new location to the caller. */
1102 logprintf (LOG_NOTQUIET,
1103 _("ERROR: Redirection (%d) without location.\n"),
1105 free(filename_plus_orig_suffix); /* must precede every return! */
1109 free(filename_plus_orig_suffix); /* must precede every return! */
1113 /* Deal with you later. */
1116 /* All possibilities should have been exhausted. */
1119 if (!(*dt & RETROKF))
1123 /* #### Ugly ugly ugly! */
1124 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1125 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1128 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1129 tms, hstat.statcode, hstat.error);
1130 logputs (LOG_VERBOSE, "\n");
1132 free(filename_plus_orig_suffix); /* must precede every return! */
1136 /* Did we get the time-stamp? */
1139 if (opt.timestamping && !hstat.remote_time)
1141 logputs (LOG_NOTQUIET, _("\
1142 Last-modified header missing -- time-stamps turned off.\n"));
1144 else if (hstat.remote_time)
1146 /* Convert the date-string into struct tm. */
1147 tmr = http_atotm (hstat.remote_time);
1148 if (tmr == (time_t) (-1))
1149 logputs (LOG_VERBOSE, _("\
1150 Last-modified header invalid -- time-stamp ignored.\n"));
1154 /* The time-stamping section. */
1159 use_ts = 0; /* no more time-stamping */
1160 count = 0; /* the retrieve count for HEAD is
1162 if (hstat.remote_time && tmr != (time_t) (-1))
1164 /* Now time-stamping can be used validly. Time-stamping
1165 means that if the sizes of the local and remote file
1166 match, and local file is newer than the remote file,
1167 it will not be retrieved. Otherwise, the normal
1168 download procedure is resumed. */
1170 (hstat.contlen == -1 || local_size == hstat.contlen))
1172 logprintf (LOG_VERBOSE, _("\
1173 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1176 free(filename_plus_orig_suffix);/*must precede every return!*/
1179 else if (tml >= tmr)
1180 logprintf (LOG_VERBOSE, _("\
1181 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1183 logputs (LOG_VERBOSE,
1184 _("Remote file is newer, retrieving.\n"));
1190 && (tmr != (time_t) (-1))
1192 && ((hstat.len == hstat.contlen) ||
1193 ((hstat.res == 0) &&
1194 ((hstat.contlen == -1) ||
1195 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1197 touch (u->local, tmr);
1199 /* End of time-stamping section. */
1203 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1204 free(filename_plus_orig_suffix); /* must precede every return! */
1208 /* It is now safe to free the remainder of hstat, since the
1209 strings within it will no longer be used. */
1212 tmrate = rate (hstat.len - hstat.restval, hstat.dltime);
1214 if (hstat.len == hstat.contlen)
1218 logprintf (LOG_VERBOSE,
1219 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1220 tms, tmrate, locf, hstat.len, hstat.contlen);
1221 logprintf (LOG_NONVERBOSE,
1222 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1223 tms, u->url, hstat.len, hstat.contlen, locf, count);
1226 opt.downloaded += hstat.len;
1228 /* Remember that we downloaded the file for later ".orig" code. */
1229 if (*dt & ADDED_HTML_EXTENSION)
1230 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1232 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1234 free(filename_plus_orig_suffix); /* must precede every return! */
1237 else if (hstat.res == 0) /* No read error */
1239 if (hstat.contlen == -1) /* We don't know how much we were supposed
1240 to get, so assume we succeeded. */
1244 logprintf (LOG_VERBOSE,
1245 _("%s (%s) - `%s' saved [%ld]\n\n"),
1246 tms, tmrate, locf, hstat.len);
1247 logprintf (LOG_NONVERBOSE,
1248 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1249 tms, u->url, hstat.len, locf, count);
1252 opt.downloaded += hstat.len;
1254 /* Remember that we downloaded the file for later ".orig" code. */
1255 if (*dt & ADDED_HTML_EXTENSION)
1256 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1258 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1260 free(filename_plus_orig_suffix); /* must precede every return! */
1263 else if (hstat.len < hstat.contlen) /* meaning we lost the
1264 connection too soon */
1266 logprintf (LOG_VERBOSE,
1267 _("%s (%s) - Connection closed at byte %ld. "),
1268 tms, tmrate, hstat.len);
1269 printwhat (count, opt.ntry);
1272 else if (!opt.kill_longer) /* meaning we got more than expected */
1274 logprintf (LOG_VERBOSE,
1275 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1276 tms, tmrate, locf, hstat.len, hstat.contlen);
1277 logprintf (LOG_NONVERBOSE,
1278 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1279 tms, u->url, hstat.len, hstat.contlen, locf, count);
1281 opt.downloaded += hstat.len;
1283 /* Remember that we downloaded the file for later ".orig" code. */
1284 if (*dt & ADDED_HTML_EXTENSION)
1285 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1287 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1289 free(filename_plus_orig_suffix); /* must precede every return! */
1292 else /* the same, but not accepted */
1294 logprintf (LOG_VERBOSE,
1295 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1296 tms, tmrate, hstat.len, hstat.contlen);
1297 printwhat (count, opt.ntry);
1301 else /* now hstat.res can only be -1 */
1303 if (hstat.contlen == -1)
1305 logprintf (LOG_VERBOSE,
1306 _("%s (%s) - Read error at byte %ld (%s)."),
1307 tms, tmrate, hstat.len, strerror (errno));
1308 printwhat (count, opt.ntry);
1311 else /* hstat.res == -1 and contlen is given */
1313 logprintf (LOG_VERBOSE,
1314 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1315 tms, tmrate, hstat.len, hstat.contlen,
1317 printwhat (count, opt.ntry);
1324 while (!opt.ntry || (count < opt.ntry));
1325 free(filename_plus_orig_suffix); /* must precede every return! */
1329 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1330 than local timezone (mktime assumes the latter).
1332 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1333 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO. */
1335 mktime_from_utc (struct tm *t)
1342 tb = mktime (gmtime (&tl));
1343 return (tl <= tb ? (tl + (tl - tb)) : (tl - (tb - tl)));
1346 /* Check whether the result of strptime() indicates success.
1347 strptime() returns the pointer to how far it got to in the string.
1348 The processing has been successful if the string is at `GMT' or
1349 `+X', or at the end of the string.
1351 In extended regexp parlance, the function returns 1 if P matches
1352 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (a valid result of
1353 strptime()) is considered a failure and 0 is returned. */
1359 while (ISSPACE (*p))
1362 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1363 || ((p[0] == '+' || p[1] == '-') && ISDIGIT (p[1])))
1369 /* Convert TIME_STRING time to time_t. TIME_STRING can be in any of
1370 the three formats RFC2068 allows the HTTP servers to emit --
1371 RFC1123-date, RFC850-date or asctime-date. Timezones are ignored,
1374 We use strptime() to recognize various dates, which makes it a
1375 little bit slacker than the RFC1123/RFC850/asctime (e.g. it always
1376 allows shortened dates and months, one-digit days, etc.). It also
1377 allows more than one space anywhere where the specs require one SP.
1378 The routine should probably be even more forgiving (as recommended
1379 by RFC2068), but I do not have the time to write one.
1381 Return the computed time_t representation, or -1 if all the
1384 Needless to say, what we *really* need here is something like
1385 Marcus Hennecke's atotm(), which is forgiving, fast, to-the-point,
1386 and does not use strptime(). atotm() is to be found in the sources
1387 of `phttpd', a little-known HTTP server written by Peter Erikson. */
1389 http_atotm (char *time_string)
1393 /* Roger Beeman says: "This function dynamically allocates struct tm
1394 t, but does no initialization. The only field that actually
1395 needs initialization is tm_isdst, since the others will be set by
1396 strptime. Since strptime does not set tm_isdst, it will return
1397 the data structure with whatever data was in tm_isdst to begin
1398 with. For those of us in timezones where DST can occur, there
1399 can be a one hour shift depending on the previous contents of the
1400 data area where the data structure is allocated." */
1403 /* Note that under foreign locales Solaris strptime() fails to
1404 recognize English dates, which renders this function useless. I
1405 assume that other non-GNU strptime's are plagued by the same
1406 disease. We solve this by setting only LC_MESSAGES in
1407 i18n_initialize(), instead of LC_ALL.
1409 Another solution could be to temporarily set locale to C, invoke
1410 strptime(), and restore it back. This is slow and dirty,
1411 however, and locale support other than LC_MESSAGES can mess other
1412 things, so I rather chose to stick with just setting LC_MESSAGES.
1414 Also note that none of this is necessary under GNU strptime(),
1415 because it recognizes both international and local dates. */
1417 /* NOTE: We don't use `%n' for white space, as OSF's strptime uses
1418 it to eat all white space up to (and including) a newline, and
1419 the function fails if there is no newline (!).
1421 Let's hope all strptime() implementations use ` ' to skip *all*
1422 whitespace instead of just one (it works that way on all the
1423 systems I've tested it on). */
1425 /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1426 if (check_end (strptime (time_string, "%a, %d %b %Y %T", &t)))
1427 return mktime_from_utc (&t);
1428 /* RFC850: Thu, 29-Jan-98 22:12:57 */
1429 if (check_end (strptime (time_string, "%a, %d-%b-%y %T", &t)))
1430 return mktime_from_utc (&t);
1431 /* asctime: Thu Jan 29 22:12:57 1998 */
1432 if (check_end (strptime (time_string, "%a %b %d %T %Y", &t)))
1433 return mktime_from_utc (&t);
1438 /* Authorization support: We support two authorization schemes:
1440 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
1442 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
1443 consisting of answering to the server's challenge with the proper
1446 /* How many bytes it will take to store LEN bytes in base64. */
1447 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
1449 /* Encode the string S of length LENGTH to base64 format and place it
1450 to STORE. STORE will be 0-terminated, and must point to a writable
1451 buffer of at least 1+BASE64_LENGTH(length) bytes. */
1453 base64_encode (const char *s, char *store, int length)
1455 /* Conversion table. */
1456 static char tbl[64] = {
1457 'A','B','C','D','E','F','G','H',
1458 'I','J','K','L','M','N','O','P',
1459 'Q','R','S','T','U','V','W','X',
1460 'Y','Z','a','b','c','d','e','f',
1461 'g','h','i','j','k','l','m','n',
1462 'o','p','q','r','s','t','u','v',
1463 'w','x','y','z','0','1','2','3',
1464 '4','5','6','7','8','9','+','/'
1467 unsigned char *p = (unsigned char *)store;
1469 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
1470 for (i = 0; i < length; i += 3)
1472 *p++ = tbl[s[0] >> 2];
1473 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
1474 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
1475 *p++ = tbl[s[2] & 0x3f];
1478 /* Pad the result if necessary... */
1479 if (i == length + 1)
1481 else if (i == length + 2)
1482 *(p - 1) = *(p - 2) = '=';
1483 /* ...and zero-terminate it. */
1487 /* Create the authentication header contents for the `Basic' scheme.
1488 This is done by encoding the string `USER:PASS' in base64 and
1489 prepending `HEADER: Basic ' to it. */
1491 basic_authentication_encode (const char *user, const char *passwd,
1494 char *t1, *t2, *res;
1495 int len1 = strlen (user) + 1 + strlen (passwd);
1496 int len2 = BASE64_LENGTH (len1);
1498 t1 = (char *)alloca (len1 + 1);
1499 sprintf (t1, "%s:%s", user, passwd);
1500 t2 = (char *)alloca (1 + len2);
1501 base64_encode (t1, t2, len1);
1502 res = (char *)malloc (len2 + 11 + strlen (header));
1503 sprintf (res, "%s: Basic %s\r\n", header, t2);
1509 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
1510 of a field in such a header. If the field is the one specified by
1511 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
1512 digest authorization code), extract its value in the (char*)
1513 variable pointed by RET. Returns negative on a malformed header,
1514 or number of bytes that have been parsed by this call. */
1516 extract_header_attr (const char *au, const char *attr_name, char **ret)
1518 const char *cp, *ep;
1522 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
1524 cp += strlen (attr_name);
1527 cp += skip_lws (cp);
1532 cp += skip_lws (cp);
1537 for (ep = cp; *ep && *ep != '\"'; ep++)
1542 *ret = strdupdelim (cp, ep);
1549 /* Response value needs to be in lowercase, so we cannot use HEXD2ASC
1550 from url.h. See RFC 2069 2.1.2 for the syntax of response-digest. */
1551 #define HEXD2asc(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
1553 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
1554 an array of 16 bytes containing the hash keys, and BUF should be a
1555 buffer of 33 writable characters (32 for hex digits plus one for
1556 zero termination). */
1558 dump_hash (unsigned char *buf, const unsigned char *hash)
1562 for (i = 0; i < MD5_HASHLEN; i++, hash++)
1564 *buf++ = HEXD2asc (*hash >> 4);
1565 *buf++ = HEXD2asc (*hash & 0xf);
1570 /* Take the line apart to find the challenge, and compose a digest
1571 authorization header. See RFC2069 section 2.1.2. */
1573 digest_authentication_encode (const char *au, const char *user,
1574 const char *passwd, const char *method,
1577 static char *realm, *opaque, *nonce;
1582 { "realm", &realm },
1583 { "opaque", &opaque },
1588 realm = opaque = nonce = NULL;
1590 au += 6; /* skip over `Digest' */
1595 au += skip_lws (au);
1596 for (i = 0; i < ARRAY_SIZE (options); i++)
1598 int skip = extract_header_attr (au, options[i].name,
1599 options[i].variable);
1603 FREE_MAYBE (opaque);
1613 if (i == ARRAY_SIZE (options))
1615 while (*au && *au != '=')
1619 au += skip_lws (au);
1623 while (*au && *au != '\"')
1630 while (*au && *au != ',')
1635 if (!realm || !nonce || !user || !passwd || !path || !method)
1638 FREE_MAYBE (opaque);
1643 /* Calculate the digest value. */
1646 unsigned char hash[MD5_HASHLEN];
1647 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
1648 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
1650 /* A1BUF = H(user ":" realm ":" password) */
1651 md5_init_ctx (&ctx);
1652 md5_process_bytes (user, strlen (user), &ctx);
1653 md5_process_bytes (":", 1, &ctx);
1654 md5_process_bytes (realm, strlen (realm), &ctx);
1655 md5_process_bytes (":", 1, &ctx);
1656 md5_process_bytes (passwd, strlen (passwd), &ctx);
1657 md5_finish_ctx (&ctx, hash);
1658 dump_hash (a1buf, hash);
1660 /* A2BUF = H(method ":" path) */
1661 md5_init_ctx (&ctx);
1662 md5_process_bytes (method, strlen (method), &ctx);
1663 md5_process_bytes (":", 1, &ctx);
1664 md5_process_bytes (path, strlen (path), &ctx);
1665 md5_finish_ctx (&ctx, hash);
1666 dump_hash (a2buf, hash);
1668 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
1669 md5_init_ctx (&ctx);
1670 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
1671 md5_process_bytes (":", 1, &ctx);
1672 md5_process_bytes (nonce, strlen (nonce), &ctx);
1673 md5_process_bytes (":", 1, &ctx);
1674 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
1675 md5_finish_ctx (&ctx, hash);
1676 dump_hash (response_digest, hash);
1678 res = (char*) xmalloc (strlen (user)
1683 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
1684 + (opaque ? strlen (opaque) : 0)
1686 sprintf (res, "Authorization: Digest \
1687 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
1688 user, realm, nonce, path, response_digest);
1691 char *p = res + strlen (res);
1692 strcat (p, ", opaque=\"");
1696 strcat (res, "\r\n");
1700 #endif /* USE_DIGEST */
1703 #define HACK_O_MATIC(line, string_constant) \
1704 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1705 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1706 || !line[sizeof (string_constant) - 1]))
1709 known_authentication_scheme_p (const char *au)
1711 return HACK_O_MATIC (au, "Basic") || HACK_O_MATIC (au, "Digest");
1716 /* Create the HTTP authorization request header. When the
1717 `WWW-Authenticate' response header is seen, according to the
1718 authorization scheme specified in that header (`Basic' and `Digest'
1719 are supported by the current implementation), produce an
1720 appropriate HTTP authorization request header. */
1722 create_authorization_line (const char *au, const char *user,
1723 const char *passwd, const char *method,
1726 char *wwwauth = NULL;
1728 if (!strncasecmp (au, "Basic", 5))
1729 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
1731 else if (!strncasecmp (au, "Digest", 6))
1732 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
1733 #endif /* USE_DIGEST */