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 *result = xstrdup (hdr);
245 p = strrchr (hdr, ';');
249 *result = (char *)xmalloc (len + 1);
250 memcpy (*result, hdr, len);
251 (*result)[len] = '\0';
254 *result = xstrdup (hdr);
261 long len; /* received length */
262 long contlen; /* expected length */
263 long restval; /* the restart value */
264 int res; /* the result of last read */
265 char *newloc; /* new location (redirection) */
266 char *remote_time; /* remote time-stamp string */
267 char *error; /* textual HTTP error */
268 int statcode; /* status code */
269 long dltime; /* time of the download */
272 /* Free the elements of hstat X. */
273 #define FREEHSTAT(x) do \
275 FREE_MAYBE ((x).newloc); \
276 FREE_MAYBE ((x).remote_time); \
277 FREE_MAYBE ((x).error); \
278 (x).newloc = (x).remote_time = (x).error = NULL; \
281 static char *create_authorization_line PARAMS ((const char *, const char *,
282 const char *, const char *,
284 static char *basic_authentication_encode PARAMS ((const char *, const char *,
286 static int known_authentication_scheme_p PARAMS ((const char *));
288 static time_t http_atotm PARAMS ((char *));
290 /* Retrieve a document through HTTP protocol. It recognizes status
291 code, and correctly handles redirections. It closes the network
292 socket. If it receives an error from the functions below it, it
293 will print it if there is enough information to do so (almost
294 always), returning the error to the caller (i.e. http_loop).
296 Various HTTP parameters are stored to hs. Although it parses the
297 response code correctly, it is not used in a sane way. The caller
300 If u->proxy is non-NULL, the URL u will be taken as a proxy URL,
301 and u->proxy->url will be given to the proxy server (bad naming,
304 gethttp (struct urlinfo *u, struct http_stat *hs, int *dt)
306 char *request, *type, *command, *path;
308 char *pragma_h, *referer, *useragent, *range, *wwwauth, *remhost;
309 char *authenticate_h;
314 int sock, hcount, num_written, all_length, remport, statcode;
315 long contlen, contrange;
319 int auth_tried_already;
322 /* Let the others worry about local filename... */
323 if (!(*dt & HEAD_ONLY))
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 hstat. */
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");
462 host_port = NULL; host_port_len = 0;
465 host_port = (char *)alloca (numdigit (remport) + 2);
466 host_port_len = sprintf (host_port, ":%d", remport);
469 /* Allocate the memory for the request. */
470 request = (char *)alloca (strlen (command) + strlen (path)
472 + strlen (remhost) + host_port_len
473 + strlen (HTTP_ACCEPT)
474 + (referer ? strlen (referer) : 0)
475 + (wwwauth ? strlen (wwwauth) : 0)
476 + (proxyauth ? strlen (proxyauth) : 0)
477 + (range ? strlen (range) : 0)
479 + (opt.user_header ? strlen (opt.user_header) : 0)
481 /* Construct the request. */
488 command, path, useragent, remhost,
489 host_port ? host_port : "",
490 HTTP_ACCEPT, referer ? referer : "",
491 wwwauth ? wwwauth : "",
492 proxyauth ? proxyauth : "",
495 opt.user_header ? opt.user_header : "");
496 DEBUGP (("---request begin---\n%s---request end---\n", request));
497 /* Free the temporary memory. */
498 FREE_MAYBE (wwwauth);
499 FREE_MAYBE (proxyauth);
501 /* Send the request to server. */
502 num_written = iwrite (sock, request, strlen (request));
505 logputs (LOG_VERBOSE, _("Failed writing HTTP request.\n"));
510 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
511 u->proxy ? "Proxy" : "HTTP");
512 contlen = contrange = -1;
517 /* Before reading anything, initialize the rbuf. */
518 rbuf_initialize (&rbuf, sock);
522 /* Header-fetching loop. */
530 /* Get the header. */
531 status = header_get (&rbuf, &hdr,
532 /* Disallow continuations for status line. */
533 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
535 /* Check for errors. */
536 if (status == HG_EOF && *hdr)
538 /* This used to be an unconditional error, but that was
539 somewhat controversial, because of a large number of
540 broken CGI's that happily "forget" to send the second EOL
541 before closing the connection of a HEAD request.
543 So, the deal is to check whether the header is empty
544 (*hdr is zero if it is); if yes, it means that the
545 previous header was fully retrieved, and that -- most
546 probably -- the request is complete. "...be liberal in
547 what you accept." Oh boy. */
548 logputs (LOG_VERBOSE, "\n");
549 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
552 FREE_MAYBE (hs->newloc);
553 FREE_MAYBE (all_headers);
557 else if (status == HG_ERROR)
559 logputs (LOG_VERBOSE, "\n");
560 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
564 FREE_MAYBE (hs->newloc);
565 FREE_MAYBE (all_headers);
570 /* If the headers are to be saved to a file later, save them to
572 if (opt.save_headers)
574 int lh = strlen (hdr);
575 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
576 memcpy (all_headers + all_length, hdr, lh);
578 all_headers[all_length++] = '\n';
579 all_headers[all_length] = '\0';
582 /* Print the header if requested. */
583 if (opt.server_response && hcount != 1)
584 logprintf (LOG_VERBOSE, "\n%d %s", hcount, hdr);
586 /* Check for status line. */
590 /* Parse the first line of server response. */
591 statcode = parse_http_status_line (hdr, &error);
592 hs->statcode = statcode;
593 /* Store the descriptive response. */
594 if (statcode == -1) /* malformed response */
596 /* A common reason for "malformed response" error is the
597 case when no data was actually received. Handle this
600 hs->error = xstrdup (_("No data received"));
602 hs->error = xstrdup (_("Malformed status line"));
607 hs->error = xstrdup (_("(no description)"));
609 hs->error = xstrdup (error);
616 logprintf (LOG_VERBOSE, "%d %s", statcode, error);
621 /* Exit on empty header. */
628 /* Try getting content-length. */
629 if (contlen == -1 && !opt.ignore_length)
630 if (header_process (hdr, "Content-Length", header_extract_number,
633 /* Try getting content-type. */
635 if (header_process (hdr, "Content-Type", http_process_type, &type))
637 /* Try getting location. */
639 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
641 /* Try getting last-modified. */
642 if (!hs->remote_time)
643 if (header_process (hdr, "Last-Modified", header_strdup,
646 /* Try getting www-authentication. */
648 if (header_process (hdr, "WWW-Authenticate", header_strdup,
651 /* Check for accept-ranges header. If it contains the word
652 `none', disable the ranges. */
653 if (*dt & ACCEPTRANGES)
656 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
659 *dt &= ~ACCEPTRANGES;
663 /* Try getting content-range. */
666 struct http_process_range_closure closure;
667 if (header_process (hdr, "Content-Range", http_process_range, &closure))
669 contrange = closure.first_byte_pos;
677 logputs (LOG_VERBOSE, "\n");
679 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
682 /* Authorization is required. */
687 if (auth_tried_already)
689 /* If we have tried it already, then there is not point
691 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
692 free (authenticate_h);
695 else if (!known_authentication_scheme_p (authenticate_h))
697 free (authenticate_h);
698 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
703 auth_tried_already = 1;
707 /* We do not need this anymore. */
710 free (authenticate_h);
711 authenticate_h = NULL;
714 /* 20x responses are counted among successful by default. */
715 if (H_20X (statcode))
718 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
721 /* We don't assume text/html by default. */
726 else if (contrange != hs->restval ||
727 (H_PARTIAL (statcode) && contrange == -1))
729 /* This means the whole request was somehow misunderstood by the
732 FREE_MAYBE (hs->newloc);
733 FREE_MAYBE (all_headers);
741 contlen += contrange;
743 contrange = -1; /* If conent-length was not sent,
744 content-range will be ignored. */
746 hs->contlen = contlen;
748 /* Return if redirected. */
749 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
751 /* RFC2068 says that in case of the 300 (multiple choices)
752 response, the server can output a preferred URL through
753 `Location' header; otherwise, the request should be treated
754 like GET. So, if the location is set, it will be a
755 redirection; otherwise, just proceed normally. */
756 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
760 logprintf (LOG_VERBOSE,
761 _("Location: %s%s\n"),
762 hs->newloc ? hs->newloc : _("unspecified"),
763 hs->newloc ? _(" [following]") : "");
766 FREE_MAYBE (all_headers);
772 if ((*dt & RETROKF) && !opt.server_response)
774 /* No need to print this output if the body won't be
775 downloaded at all, or if the original server response is
777 logputs (LOG_VERBOSE, _("Length: "));
780 logputs (LOG_VERBOSE, legible (contlen));
782 logprintf (LOG_VERBOSE, _(" (%s to go)"),
783 legible (contlen - contrange));
786 logputs (LOG_VERBOSE,
787 opt.ignore_length ? _("ignored") : _("unspecified"));
789 logprintf (LOG_VERBOSE, " [%s]\n", type);
791 logputs (LOG_VERBOSE, "\n");
795 type = NULL; /* We don't need it any more. */
797 /* Return if we have no intention of further downloading. */
798 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
800 /* In case someone cares to look... */
804 FREE_MAYBE (all_headers);
809 /* Open the local file. */
812 mkalldirs (u->local);
814 rotate_backups (u->local);
815 fp = fopen (u->local, hs->restval ? "ab" : "wb");
818 logprintf (LOG_NOTQUIET, "%s: %s\n", u->local, strerror (errno));
820 FREE_MAYBE (all_headers);
827 /* #### This confuses the code that checks for file size. There
828 should be some overhead information. */
829 if (opt.save_headers)
830 fwrite (all_headers, 1, all_length, fp);
832 /* Get the contents of the document. */
833 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
834 (contlen != -1 ? contlen : 0),
836 hs->dltime = elapsed_time ();
841 FREE_MAYBE (all_headers);
848 /* The genuine HTTP loop! This is the part where the retrieval is
849 retried, and retried, and retried, and... */
851 http_loop (struct urlinfo *u, char **newloc, int *dt)
853 static int first_retrieval = 1;
856 int local_dot_orig_file_exists = FALSE;
857 int use_ts, got_head = 0; /* time-stamping info */
858 char *tms, *suf, *locf, *tmrate;
860 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
861 long local_size = 0; /* the size of the local file */
862 struct http_stat hstat; /* HTTP status */
867 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
868 has_wildcards_p because it would also warn on `?', and we know that
869 shows up in CGI paths a *lot*. */
870 if (strchr (u->url, '*'))
871 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
873 /* Determine the local filename. */
875 u->local = url_filename (u->proxy ? u->proxy : u);
877 if (!opt.output_document)
880 locf = opt.output_document;
882 if (opt.noclobber && file_exists_p (u->local))
884 /* If opt.noclobber is turned on and file already exists, do not
886 logprintf (LOG_VERBOSE, _("\
887 File `%s' already there, will not retrieve.\n"), u->local);
888 /* If the file is there, we suppose it's retrieved OK. */
891 /* #### Bogusness alert. */
892 /* If its suffix is "html" or (yuck!) "htm", we suppose it's
893 text/html, a harmless lie. */
894 if (((suf = suffix (u->local)) != NULL)
895 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
898 /* Another harmless lie: */
903 if (opt.timestamping)
905 boolean local_file_exists = FALSE;
907 if (opt.backup_converted)
908 /* If -K is specified, we'll act on the assumption that it was specified
909 last time these files were downloaded as well, and instead of just
910 comparing local file X against server file X, we'll compare local
911 file X.orig (if extant, else X) against server file X. If -K
912 _wasn't_ specified last time, or the server contains files called
913 *.orig, -N will be back to not operating correctly with -k. */
915 size_t filename_len = strlen(u->local);
916 char* filename_plus_orig_suffix = malloc(filename_len +
919 /* Would a single s[n]printf() call be faster? */
920 strcpy(filename_plus_orig_suffix, u->local);
921 strcpy(filename_plus_orig_suffix + filename_len, ".orig");
923 /* Try to stat() the .orig file. */
924 if (stat(filename_plus_orig_suffix, &st) == 0)
926 local_file_exists = TRUE;
927 local_dot_orig_file_exists = TRUE;
930 free(filename_plus_orig_suffix);
933 if (!local_dot_orig_file_exists)
934 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
935 if (stat (u->local, &st) == 0)
936 local_file_exists = TRUE;
938 if (local_file_exists)
939 /* There was a local file, so we'll check later to see if the version
940 the server has is the same version we already have, allowing us to
945 local_size = st.st_size;
949 /* Reset the counter. */
951 *dt = 0 | ACCEPTRANGES;
955 /* Increment the pass counter. */
957 /* Wait before the retrieval (unless this is the very first
959 Check if we are retrying or not, wait accordingly - HEH */
960 if (!first_retrieval && (opt.wait || (count && opt.waitretry)))
964 if (count<opt.waitretry)
967 sleep(opt.waitretry);
974 /* Get the current time string. */
975 tms = time_str (NULL);
976 /* Print fetch message, if opt.verbose. */
979 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
983 sprintf (tmp, _("(try:%2d)"), count);
984 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
985 tms, hurl, tmp, locf);
987 ws_changetitle (hurl, 1);
992 /* Default document type is empty. However, if spider mode is
993 on or time-stamping is employed, HEAD_ONLY commands is
994 encoded within *dt. */
995 if (opt.spider || (use_ts && !got_head))
999 /* Assume no restarting. */
1001 /* Decide whether or not to restart. */
1002 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1003 && file_exists_p (u->local))
1004 if (stat (u->local, &st) == 0)
1005 hstat.restval = st.st_size;
1006 /* Decide whether to send the no-cache directive. */
1007 if (u->proxy && (count > 1 || (opt.proxy_cache == 0)))
1008 *dt |= SEND_NOCACHE;
1010 *dt &= ~SEND_NOCACHE;
1012 /* Try fetching the document, or at least its head. :-) */
1013 err = gethttp (u, &hstat, dt);
1015 tms = time_str (NULL);
1016 /* Get the new location (with or without the redirection). */
1018 *newloc = xstrdup (hstat.newloc);
1021 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1022 case CONERROR: case READERR: case WRITEFAILED:
1024 /* Non-fatal errors continue executing the loop, which will
1025 bring them to "while" statement at the end, to judge
1026 whether the number of tries was exceeded. */
1028 printwhat (count, opt.ntry);
1031 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1032 /* Fatal errors just return from the function. */
1036 case FWRITEERR: case FOPENERR:
1037 /* Another fatal error. */
1038 logputs (LOG_VERBOSE, "\n");
1039 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1040 u->local, strerror (errno));
1045 /* Return the new location to the caller. */
1048 logprintf (LOG_NOTQUIET,
1049 _("ERROR: Redirection (%d) without location.\n"),
1057 /* Deal with you later. */
1060 /* All possibilities should have been exhausted. */
1063 if (!(*dt & RETROKF))
1067 /* #### Ugly ugly ugly! */
1068 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1069 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1072 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1073 tms, hstat.statcode, hstat.error);
1074 logputs (LOG_VERBOSE, "\n");
1079 /* Did we get the time-stamp? */
1082 if (opt.timestamping && !hstat.remote_time)
1084 logputs (LOG_NOTQUIET, _("\
1085 Last-modified header missing -- time-stamps turned off.\n"));
1087 else if (hstat.remote_time)
1089 /* Convert the date-string into struct tm. */
1090 tmr = http_atotm (hstat.remote_time);
1091 if (tmr == (time_t) (-1))
1092 logputs (LOG_VERBOSE, _("\
1093 Last-modified header invalid -- time-stamp ignored.\n"));
1097 /* The time-stamping section. */
1102 use_ts = 0; /* no more time-stamping */
1103 count = 0; /* the retrieve count for HEAD is
1105 if (hstat.remote_time && tmr != (time_t) (-1))
1107 /* Now time-stamping can be used validly. Time-stamping
1108 means that if the sizes of the local and remote file
1109 match, and local file is newer than the remote file,
1110 it will not be retrieved. Otherwise, the normal
1111 download procedure is resumed. */
1113 (hstat.contlen == -1 || local_size == hstat.contlen))
1115 if (local_dot_orig_file_exists)
1116 /* We can't collapse this down into just one logprintf()
1117 call with a variable set to u->local or the .orig
1118 filename because we have to malloc() space for the
1119 latter, and because there are multiple returns above (a
1120 coding style no-no by many measures, for reasons such as
1121 this) we'd have to remember to free() the string at each
1122 one to avoid a memory leak. */
1123 logprintf (LOG_VERBOSE, _("\
1124 Server file no newer than local file `%s.orig' -- not retrieving.\n\n"),
1127 logprintf (LOG_VERBOSE, _("\
1128 Server file no newer than local file `%s' -- not retrieving.\n\n"), u->local);
1132 else if (tml >= tmr)
1133 logprintf (LOG_VERBOSE, _("\
1134 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1136 logputs (LOG_VERBOSE,
1137 _("Remote file is newer, retrieving.\n"));
1143 && (tmr != (time_t) (-1))
1145 && ((hstat.len == hstat.contlen) ||
1146 ((hstat.res == 0) &&
1147 ((hstat.contlen == -1) ||
1148 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1150 touch (u->local, tmr);
1152 /* End of time-stamping section. */
1156 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1160 /* It is now safe to free the remainder of hstat, since the
1161 strings within it will no longer be used. */
1164 tmrate = rate (hstat.len - hstat.restval, hstat.dltime);
1166 if (hstat.len == hstat.contlen)
1170 logprintf (LOG_VERBOSE,
1171 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1172 tms, tmrate, locf, hstat.len, hstat.contlen);
1173 logprintf (LOG_NONVERBOSE,
1174 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1175 tms, u->url, hstat.len, hstat.contlen, locf, count);
1178 opt.downloaded += hstat.len;
1179 downloaded_file(ADD_FILE, locf);
1182 else if (hstat.res == 0) /* No read error */
1184 if (hstat.contlen == -1) /* We don't know how much we were supposed
1185 to get, so assume we succeeded. */
1189 logprintf (LOG_VERBOSE,
1190 _("%s (%s) - `%s' saved [%ld]\n\n"),
1191 tms, tmrate, locf, hstat.len);
1192 logprintf (LOG_NONVERBOSE,
1193 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1194 tms, u->url, hstat.len, locf, count);
1197 opt.downloaded += hstat.len;
1198 downloaded_file(ADD_FILE, locf);
1201 else if (hstat.len < hstat.contlen) /* meaning we lost the
1202 connection too soon */
1204 logprintf (LOG_VERBOSE,
1205 _("%s (%s) - Connection closed at byte %ld. "),
1206 tms, tmrate, hstat.len);
1207 printwhat (count, opt.ntry);
1210 else if (!opt.kill_longer) /* meaning we got more than expected */
1212 logprintf (LOG_VERBOSE,
1213 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1214 tms, tmrate, locf, hstat.len, hstat.contlen);
1215 logprintf (LOG_NONVERBOSE,
1216 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1217 tms, u->url, hstat.len, hstat.contlen, locf, count);
1219 opt.downloaded += hstat.len;
1220 downloaded_file(ADD_FILE, locf);
1223 else /* the same, but not accepted */
1225 logprintf (LOG_VERBOSE,
1226 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1227 tms, tmrate, hstat.len, hstat.contlen);
1228 printwhat (count, opt.ntry);
1232 else /* now hstat.res can only be -1 */
1234 if (hstat.contlen == -1)
1236 logprintf (LOG_VERBOSE,
1237 _("%s (%s) - Read error at byte %ld (%s)."),
1238 tms, tmrate, hstat.len, strerror (errno));
1239 printwhat (count, opt.ntry);
1242 else /* hstat.res == -1 and contlen is given */
1244 logprintf (LOG_VERBOSE,
1245 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1246 tms, tmrate, hstat.len, hstat.contlen,
1248 printwhat (count, opt.ntry);
1255 while (!opt.ntry || (count < opt.ntry));
1259 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1260 than local timezone (mktime assumes the latter).
1262 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1263 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO. */
1265 mktime_from_utc (struct tm *t)
1272 tb = mktime (gmtime (&tl));
1273 return (tl <= tb ? (tl + (tl - tb)) : (tl - (tb - tl)));
1276 /* Check whether the result of strptime() indicates success.
1277 strptime() returns the pointer to how far it got to in the string.
1278 The processing has been successful if the string is at `GMT' or
1279 `+X', or at the end of the string.
1281 In extended regexp parlance, the function returns 1 if P matches
1282 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (a valid result of
1283 strptime()) is considered a failure and 0 is returned. */
1289 while (ISSPACE (*p))
1292 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1293 || ((p[0] == '+' || p[1] == '-') && ISDIGIT (p[1])))
1299 /* Convert TIME_STRING time to time_t. TIME_STRING can be in any of
1300 the three formats RFC2068 allows the HTTP servers to emit --
1301 RFC1123-date, RFC850-date or asctime-date. Timezones are ignored,
1304 We use strptime() to recognize various dates, which makes it a
1305 little bit slacker than the RFC1123/RFC850/asctime (e.g. it always
1306 allows shortened dates and months, one-digit days, etc.). It also
1307 allows more than one space anywhere where the specs require one SP.
1308 The routine should probably be even more forgiving (as recommended
1309 by RFC2068), but I do not have the time to write one.
1311 Return the computed time_t representation, or -1 if all the
1314 Needless to say, what we *really* need here is something like
1315 Marcus Hennecke's atotm(), which is forgiving, fast, to-the-point,
1316 and does not use strptime(). atotm() is to be found in the sources
1317 of `phttpd', a little-known HTTP server written by Peter Erikson. */
1319 http_atotm (char *time_string)
1323 /* Roger Beeman says: "This function dynamically allocates struct tm
1324 t, but does no initialization. The only field that actually
1325 needs initialization is tm_isdst, since the others will be set by
1326 strptime. Since strptime does not set tm_isdst, it will return
1327 the data structure with whatever data was in tm_isdst to begin
1328 with. For those of us in timezones where DST can occur, there
1329 can be a one hour shift depending on the previous contents of the
1330 data area where the data structure is allocated." */
1333 /* Note that under foreign locales Solaris strptime() fails to
1334 recognize English dates, which renders this function useless. I
1335 assume that other non-GNU strptime's are plagued by the same
1336 disease. We solve this by setting only LC_MESSAGES in
1337 i18n_initialize(), instead of LC_ALL.
1339 Another solution could be to temporarily set locale to C, invoke
1340 strptime(), and restore it back. This is slow and dirty,
1341 however, and locale support other than LC_MESSAGES can mess other
1342 things, so I rather chose to stick with just setting LC_MESSAGES.
1344 Also note that none of this is necessary under GNU strptime(),
1345 because it recognizes both international and local dates. */
1347 /* NOTE: We don't use `%n' for white space, as OSF's strptime uses
1348 it to eat all white space up to (and including) a newline, and
1349 the function fails if there is no newline (!).
1351 Let's hope all strptime() implementations use ` ' to skip *all*
1352 whitespace instead of just one (it works that way on all the
1353 systems I've tested it on). */
1355 /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1356 if (check_end (strptime (time_string, "%a, %d %b %Y %T", &t)))
1357 return mktime_from_utc (&t);
1358 /* RFC850: Thu, 29-Jan-98 22:12:57 */
1359 if (check_end (strptime (time_string, "%a, %d-%b-%y %T", &t)))
1360 return mktime_from_utc (&t);
1361 /* asctime: Thu Jan 29 22:12:57 1998 */
1362 if (check_end (strptime (time_string, "%a %b %d %T %Y", &t)))
1363 return mktime_from_utc (&t);
1368 /* Authorization support: We support two authorization schemes:
1370 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
1372 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
1373 consisting of answering to the server's challenge with the proper
1376 /* How many bytes it will take to store LEN bytes in base64. */
1377 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
1379 /* Encode the string S of length LENGTH to base64 format and place it
1380 to STORE. STORE will be 0-terminated, and must point to a writable
1381 buffer of at least 1+BASE64_LENGTH(length) bytes. */
1383 base64_encode (const char *s, char *store, int length)
1385 /* Conversion table. */
1386 static char tbl[64] = {
1387 'A','B','C','D','E','F','G','H',
1388 'I','J','K','L','M','N','O','P',
1389 'Q','R','S','T','U','V','W','X',
1390 'Y','Z','a','b','c','d','e','f',
1391 'g','h','i','j','k','l','m','n',
1392 'o','p','q','r','s','t','u','v',
1393 'w','x','y','z','0','1','2','3',
1394 '4','5','6','7','8','9','+','/'
1397 unsigned char *p = (unsigned char *)store;
1399 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
1400 for (i = 0; i < length; i += 3)
1402 *p++ = tbl[s[0] >> 2];
1403 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
1404 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
1405 *p++ = tbl[s[2] & 0x3f];
1408 /* Pad the result if necessary... */
1409 if (i == length + 1)
1411 else if (i == length + 2)
1412 *(p - 1) = *(p - 2) = '=';
1413 /* ...and zero-terminate it. */
1417 /* Create the authentication header contents for the `Basic' scheme.
1418 This is done by encoding the string `USER:PASS' in base64 and
1419 prepending `HEADER: Basic ' to it. */
1421 basic_authentication_encode (const char *user, const char *passwd,
1424 char *t1, *t2, *res;
1425 int len1 = strlen (user) + 1 + strlen (passwd);
1426 int len2 = BASE64_LENGTH (len1);
1428 t1 = (char *)alloca (len1 + 1);
1429 sprintf (t1, "%s:%s", user, passwd);
1430 t2 = (char *)alloca (1 + len2);
1431 base64_encode (t1, t2, len1);
1432 res = (char *)malloc (len2 + 11 + strlen (header));
1433 sprintf (res, "%s: Basic %s\r\n", header, t2);
1439 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
1440 of a field in such a header. If the field is the one specified by
1441 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
1442 digest authorization code), extract its value in the (char*)
1443 variable pointed by RET. Returns negative on a malformed header,
1444 or number of bytes that have been parsed by this call. */
1446 extract_header_attr (const char *au, const char *attr_name, char **ret)
1448 const char *cp, *ep;
1452 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
1454 cp += strlen (attr_name);
1457 cp += skip_lws (cp);
1462 cp += skip_lws (cp);
1467 for (ep = cp; *ep && *ep != '\"'; ep++)
1472 *ret = strdupdelim (cp, ep);
1479 /* Response value needs to be in lowercase, so we cannot use HEXD2ASC
1480 from url.h. See RFC 2069 2.1.2 for the syntax of response-digest. */
1481 #define HEXD2asc(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
1483 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
1484 an array of 16 bytes containing the hash keys, and BUF should be a
1485 buffer of 33 writable characters (32 for hex digits plus one for
1486 zero termination). */
1488 dump_hash (unsigned char *buf, const unsigned char *hash)
1492 for (i = 0; i < MD5_HASHLEN; i++, hash++)
1494 *buf++ = HEXD2asc (*hash >> 4);
1495 *buf++ = HEXD2asc (*hash & 0xf);
1500 /* Take the line apart to find the challenge, and compose a digest
1501 authorization header. See RFC2069 section 2.1.2. */
1503 digest_authentication_encode (const char *au, const char *user,
1504 const char *passwd, const char *method,
1507 static char *realm, *opaque, *nonce;
1512 { "realm", &realm },
1513 { "opaque", &opaque },
1518 realm = opaque = nonce = NULL;
1520 au += 6; /* skip over `Digest' */
1525 au += skip_lws (au);
1526 for (i = 0; i < ARRAY_SIZE (options); i++)
1528 int skip = extract_header_attr (au, options[i].name,
1529 options[i].variable);
1533 FREE_MAYBE (opaque);
1543 if (i == ARRAY_SIZE (options))
1545 while (*au && *au != '=')
1549 au += skip_lws (au);
1553 while (*au && *au != '\"')
1560 while (*au && *au != ',')
1565 if (!realm || !nonce || !user || !passwd || !path || !method)
1568 FREE_MAYBE (opaque);
1573 /* Calculate the digest value. */
1576 unsigned char hash[MD5_HASHLEN];
1577 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
1578 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
1580 /* A1BUF = H(user ":" realm ":" password) */
1581 md5_init_ctx (&ctx);
1582 md5_process_bytes (user, strlen (user), &ctx);
1583 md5_process_bytes (":", 1, &ctx);
1584 md5_process_bytes (realm, strlen (realm), &ctx);
1585 md5_process_bytes (":", 1, &ctx);
1586 md5_process_bytes (passwd, strlen (passwd), &ctx);
1587 md5_finish_ctx (&ctx, hash);
1588 dump_hash (a1buf, hash);
1590 /* A2BUF = H(method ":" path) */
1591 md5_init_ctx (&ctx);
1592 md5_process_bytes (method, strlen (method), &ctx);
1593 md5_process_bytes (":", 1, &ctx);
1594 md5_process_bytes (path, strlen (path), &ctx);
1595 md5_finish_ctx (&ctx, hash);
1596 dump_hash (a2buf, hash);
1598 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
1599 md5_init_ctx (&ctx);
1600 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
1601 md5_process_bytes (":", 1, &ctx);
1602 md5_process_bytes (nonce, strlen (nonce), &ctx);
1603 md5_process_bytes (":", 1, &ctx);
1604 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
1605 md5_finish_ctx (&ctx, hash);
1606 dump_hash (response_digest, hash);
1608 res = (char*) xmalloc (strlen (user)
1613 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
1614 + (opaque ? strlen (opaque) : 0)
1616 sprintf (res, "Authorization: Digest \
1617 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
1618 user, realm, nonce, path, response_digest);
1621 char *p = res + strlen (res);
1622 strcat (p, ", opaque=\"");
1626 strcat (res, "\r\n");
1630 #endif /* USE_DIGEST */
1633 #define HACK_O_MATIC(line, string_constant) \
1634 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1635 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1636 || !line[sizeof (string_constant) - 1]))
1639 known_authentication_scheme_p (const char *au)
1641 return HACK_O_MATIC (au, "Basic") || HACK_O_MATIC (au, "Digest");
1646 /* Create the HTTP authorization request header. When the
1647 `WWW-Authenticate' response header is seen, according to the
1648 authorization scheme specified in that header (`Basic' and `Digest'
1649 are supported by the current implementation), produce an
1650 appropriate HTTP authorization request header. */
1652 create_authorization_line (const char *au, const char *user,
1653 const char *passwd, const char *method,
1656 char *wwwauth = NULL;
1658 if (!strncasecmp (au, "Basic", 5))
1659 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
1661 else if (!strncasecmp (au, "Digest", 6))
1662 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
1663 #endif /* USE_DIGEST */