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;
387 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
391 referer = (char *)alloca (9 + strlen (ou->referer) + 3);
392 sprintf (referer, "Referer: %s\r\n", ou->referer);
394 if (*dt & SEND_NOCACHE)
395 pragma_h = "Pragma: no-cache\r\n";
400 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
401 /* #### Gag me! Some servers (e.g. WebSitePro) have been known
402 to misinterpret the following `Range' format, and return the
403 document as multipart/x-byte-ranges MIME type!
405 #### TODO: Interpret MIME types, recognize bullshits similar
406 the one described above, and deal with them! */
407 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
412 STRDUP_ALLOCA (useragent, opt.useragent);
415 useragent = (char *)alloca (10 + strlen (version_string));
416 sprintf (useragent, "Wget/%s", version_string);
418 /* Construct the authentication, if userid is present. */
421 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
422 user = user ? user : opt.http_user;
423 passwd = passwd ? passwd : opt.http_passwd;
426 if (authenticate_h && user && passwd)
428 wwwauth = create_authorization_line (authenticate_h, user, passwd,
435 char *proxy_user, *proxy_passwd;
436 /* For normal username and password, URL components override
437 command-line/wgetrc parameters. With proxy authentication,
438 it's the reverse, because proxy URLs are normally the
439 "permanent" ones, so command-line args should take
441 if (opt.proxy_user && opt.proxy_passwd)
443 proxy_user = opt.proxy_user;
444 proxy_passwd = opt.proxy_passwd;
448 proxy_user = u->user;
449 proxy_passwd = u->passwd;
451 /* #### This is junky. Can't the proxy request, say, `Digest'
453 if (proxy_user && proxy_passwd)
454 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
455 "Proxy-Authorization");
461 host_port = NULL; host_port_len = 0;
464 host_port = (char *)alloca (numdigit (remport) + 2);
465 host_port_len = sprintf (host_port, ":%d", remport);
468 /* Allocate the memory for the request. */
469 request = (char *)alloca (strlen (command) + strlen (path)
471 + strlen (remhost) + host_port_len
472 + strlen (HTTP_ACCEPT)
473 + (referer ? strlen (referer) : 0)
474 + (wwwauth ? strlen (wwwauth) : 0)
475 + (proxyauth ? strlen (proxyauth) : 0)
476 + (range ? strlen (range) : 0)
478 + (opt.user_header ? strlen (opt.user_header) : 0)
480 /* Construct the request. */
487 command, path, useragent, remhost, host_port ? host_port : "",
488 HTTP_ACCEPT, referer ? referer : "",
489 wwwauth ? wwwauth : "",
490 proxyauth ? proxyauth : "",
493 opt.user_header ? opt.user_header : "");
494 DEBUGP (("---request begin---\n%s---request end---\n", request));
495 /* Free the temporary memory. */
496 FREE_MAYBE (wwwauth);
497 FREE_MAYBE (proxyauth);
499 /* Send the request to server. */
500 num_written = iwrite (sock, request, strlen (request));
503 logputs (LOG_VERBOSE, _("Failed writing HTTP request.\n"));
508 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
509 u->proxy ? "Proxy" : "HTTP");
510 contlen = contrange = -1;
515 /* Before reading anything, initialize the rbuf. */
516 rbuf_initialize (&rbuf, sock);
520 /* Header-fetching loop. */
528 /* Get the header. */
529 status = header_get (&rbuf, &hdr,
530 /* Disallow continuations for status line. */
531 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
533 /* Check for errors. */
534 if (status == HG_EOF && *hdr)
536 /* This used to be an unconditional error, but that was
537 somewhat controversial, because of a large number of
538 broken CGI's that happily "forget" to send the second EOL
539 before closing the connection of a HEAD request.
541 So, the deal is to check whether the header is empty
542 (*hdr is zero if it is); if yes, it means that the
543 previous header was fully retrieved, and that -- most
544 probably -- the request is complete. "...be liberal in
545 what you accept." Oh boy. */
546 logputs (LOG_VERBOSE, "\n");
547 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
550 FREE_MAYBE (hs->newloc);
551 FREE_MAYBE (all_headers);
555 else if (status == HG_ERROR)
557 logputs (LOG_VERBOSE, "\n");
558 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
562 FREE_MAYBE (hs->newloc);
563 FREE_MAYBE (all_headers);
568 /* If the headers are to be saved to a file later, save them to
570 if (opt.save_headers)
572 int lh = strlen (hdr);
573 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
574 memcpy (all_headers + all_length, hdr, lh);
576 all_headers[all_length++] = '\n';
577 all_headers[all_length] = '\0';
580 /* Print the header if requested. */
581 if (opt.server_response && hcount != 1)
582 logprintf (LOG_VERBOSE, "\n%d %s", hcount, hdr);
584 /* Check for status line. */
588 /* Parse the first line of server response. */
589 statcode = parse_http_status_line (hdr, &error);
590 hs->statcode = statcode;
591 /* Store the descriptive response. */
592 if (statcode == -1) /* malformed response */
594 /* A common reason for "malformed response" error is the
595 case when no data was actually received. Handle this
598 hs->error = xstrdup (_("No data received"));
600 hs->error = xstrdup (_("Malformed status line"));
605 hs->error = xstrdup (_("(no description)"));
607 hs->error = xstrdup (error);
614 logprintf (LOG_VERBOSE, "%d %s", statcode, error);
619 /* Exit on empty header. */
626 /* Try getting content-length. */
627 if (contlen == -1 && !opt.ignore_length)
628 if (header_process (hdr, "Content-Length", header_extract_number,
631 /* Try getting content-type. */
633 if (header_process (hdr, "Content-Type", http_process_type, &type))
635 /* Try getting location. */
637 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
639 /* Try getting last-modified. */
640 if (!hs->remote_time)
641 if (header_process (hdr, "Last-Modified", header_strdup,
644 /* Try getting www-authentication. */
646 if (header_process (hdr, "WWW-Authenticate", header_strdup,
649 /* Check for accept-ranges header. If it contains the word
650 `none', disable the ranges. */
651 if (*dt & ACCEPTRANGES)
654 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
657 *dt &= ~ACCEPTRANGES;
661 /* Try getting content-range. */
664 struct http_process_range_closure closure;
665 if (header_process (hdr, "Content-Range", http_process_range, &closure))
667 contrange = closure.first_byte_pos;
675 logputs (LOG_VERBOSE, "\n");
677 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
680 /* Authorization is required. */
685 if (auth_tried_already)
687 /* If we have tried it already, then there is not point
689 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
690 free (authenticate_h);
693 else if (!known_authentication_scheme_p (authenticate_h))
695 free (authenticate_h);
696 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
701 auth_tried_already = 1;
705 /* We do not need this anymore. */
708 free (authenticate_h);
709 authenticate_h = NULL;
712 /* 20x responses are counted among successful by default. */
713 if (H_20X (statcode))
716 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
719 /* We don't assume text/html by default. */
724 else if (contrange != hs->restval ||
725 (H_PARTIAL (statcode) && contrange == -1))
727 /* This means the whole request was somehow misunderstood by the
730 FREE_MAYBE (hs->newloc);
731 FREE_MAYBE (all_headers);
739 contlen += contrange;
741 contrange = -1; /* If conent-length was not sent,
742 content-range will be ignored. */
744 hs->contlen = contlen;
746 /* Return if redirected. */
747 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
749 /* RFC2068 says that in case of the 300 (multiple choices)
750 response, the server can output a preferred URL through
751 `Location' header; otherwise, the request should be treated
752 like GET. So, if the location is set, it will be a
753 redirection; otherwise, just proceed normally. */
754 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
758 logprintf (LOG_VERBOSE,
759 _("Location: %s%s\n"),
760 hs->newloc ? hs->newloc : _("unspecified"),
761 hs->newloc ? _(" [following]") : "");
764 FREE_MAYBE (all_headers);
770 if ((*dt & RETROKF) && !opt.server_response)
772 /* No need to print this output if the body won't be
773 downloaded at all, or if the original server response is
775 logputs (LOG_VERBOSE, _("Length: "));
778 logputs (LOG_VERBOSE, legible (contlen));
780 logprintf (LOG_VERBOSE, _(" (%s to go)"),
781 legible (contlen - contrange));
784 logputs (LOG_VERBOSE,
785 opt.ignore_length ? _("ignored") : _("unspecified"));
787 logprintf (LOG_VERBOSE, " [%s]\n", type);
789 logputs (LOG_VERBOSE, "\n");
793 type = NULL; /* We don't need it any more. */
795 /* Return if we have no intention of further downloading. */
796 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
798 /* In case someone cares to look... */
802 FREE_MAYBE (all_headers);
807 /* Open the local file. */
810 mkalldirs (u->local);
812 rotate_backups (u->local);
813 fp = fopen (u->local, hs->restval ? "ab" : "wb");
816 logprintf (LOG_NOTQUIET, "%s: %s\n", u->local, strerror (errno));
818 FREE_MAYBE (all_headers);
825 /* #### This confuses the code that checks for file size. There
826 should be some overhead information. */
827 if (opt.save_headers)
828 fwrite (all_headers, 1, all_length, fp);
830 /* Get the contents of the document. */
831 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
832 (contlen != -1 ? contlen : 0),
834 hs->dltime = elapsed_time ();
839 FREE_MAYBE (all_headers);
846 /* The genuine HTTP loop! This is the part where the retrieval is
847 retried, and retried, and retried, and... */
849 http_loop (struct urlinfo *u, char **newloc, int *dt)
851 static int first_retrieval = 1;
854 int local_dot_orig_file_exists = FALSE;
855 int use_ts, got_head = 0; /* time-stamping info */
856 char *tms, *suf, *locf, *tmrate;
858 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
859 long local_size = 0; /* the size of the local file */
860 struct http_stat hstat; /* HTTP status */
865 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
866 has_wildcards_p because it would also warn on `?', and we know that
867 shows up in CGI paths a *lot*. */
868 if (strchr (u->url, '*'))
869 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
871 /* Determine the local filename. */
873 u->local = url_filename (u->proxy ? u->proxy : u);
875 if (!opt.output_document)
878 locf = opt.output_document;
880 if (opt.noclobber && file_exists_p (u->local))
882 /* If opt.noclobber is turned on and file already exists, do not
884 logprintf (LOG_VERBOSE, _("\
885 File `%s' already there, will not retrieve.\n"), u->local);
886 /* If the file is there, we suppose it's retrieved OK. */
889 /* #### Bogusness alert. */
890 /* If its suffix is "html" or (yuck!) "htm", we suppose it's
891 text/html, a harmless lie. */
892 if (((suf = suffix (u->local)) != NULL)
893 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
896 /* Another harmless lie: */
901 if (opt.timestamping)
903 boolean local_file_exists = FALSE;
905 if (opt.backup_converted)
906 /* If -K is specified, we'll act on the assumption that it was specified
907 last time these files were downloaded as well, and instead of just
908 comparing local file X against server file X, we'll compare local
909 file X.orig (if extant, else X) against server file X. If -K
910 _wasn't_ specified last time, or the server contains files called
911 *.orig, -N will be back to not operating correctly with -k. */
913 size_t filename_len = strlen(u->local);
914 char* filename_plus_orig_suffix = malloc(filename_len +
917 /* Would a single s[n]printf() call be faster? */
918 strcpy(filename_plus_orig_suffix, u->local);
919 strcpy(filename_plus_orig_suffix + filename_len, ".orig");
921 /* Try to stat() the .orig file. */
922 if (stat(filename_plus_orig_suffix, &st) == 0)
924 local_file_exists = TRUE;
925 local_dot_orig_file_exists = TRUE;
928 free(filename_plus_orig_suffix);
931 if (!local_dot_orig_file_exists)
932 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
933 if (stat (u->local, &st) == 0)
934 local_file_exists = TRUE;
936 if (local_file_exists)
937 /* There was a local file, so we'll check later to see if the version
938 the server has is the same version we already have, allowing us to
943 local_size = st.st_size;
947 /* Reset the counter. */
949 *dt = 0 | ACCEPTRANGES;
953 /* Increment the pass counter. */
955 /* Wait before the retrieval (unless this is the very first
957 if (!first_retrieval && opt.wait)
961 /* Get the current time string. */
962 tms = time_str (NULL);
963 /* Print fetch message, if opt.verbose. */
966 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
970 sprintf (tmp, _("(try:%2d)"), count);
971 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
972 tms, hurl, tmp, locf);
974 ws_changetitle (hurl, 1);
979 /* Default document type is empty. However, if spider mode is
980 on or time-stamping is employed, HEAD_ONLY commands is
981 encoded within *dt. */
982 if (opt.spider || (use_ts && !got_head))
986 /* Assume no restarting. */
988 /* Decide whether or not to restart. */
989 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
990 && file_exists_p (u->local))
991 if (stat (u->local, &st) == 0)
992 hstat.restval = st.st_size;
993 /* Decide whether to send the no-cache directive. */
994 if (u->proxy && (count > 1 || (opt.proxy_cache == 0)))
997 *dt &= ~SEND_NOCACHE;
999 /* Try fetching the document, or at least its head. :-) */
1000 err = gethttp (u, &hstat, dt);
1002 tms = time_str (NULL);
1003 /* Get the new location (with or without the redirection). */
1005 *newloc = xstrdup (hstat.newloc);
1008 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1009 case CONERROR: case READERR: case WRITEFAILED:
1011 /* Non-fatal errors continue executing the loop, which will
1012 bring them to "while" statement at the end, to judge
1013 whether the number of tries was exceeded. */
1015 printwhat (count, opt.ntry);
1018 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1019 /* Fatal errors just return from the function. */
1023 case FWRITEERR: case FOPENERR:
1024 /* Another fatal error. */
1025 logputs (LOG_VERBOSE, "\n");
1026 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1027 u->local, strerror (errno));
1032 /* Return the new location to the caller. */
1035 logprintf (LOG_NOTQUIET,
1036 _("ERROR: Redirection (%d) without location.\n"),
1044 /* Deal with you later. */
1047 /* All possibilities should have been exhausted. */
1050 if (!(*dt & RETROKF))
1054 /* #### Ugly ugly ugly! */
1055 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1056 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1059 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1060 tms, hstat.statcode, hstat.error);
1061 logputs (LOG_VERBOSE, "\n");
1066 /* Did we get the time-stamp? */
1069 if (opt.timestamping && !hstat.remote_time)
1071 logputs (LOG_NOTQUIET, _("\
1072 Last-modified header missing -- time-stamps turned off.\n"));
1074 else if (hstat.remote_time)
1076 /* Convert the date-string into struct tm. */
1077 tmr = http_atotm (hstat.remote_time);
1078 if (tmr == (time_t) (-1))
1079 logputs (LOG_VERBOSE, _("\
1080 Last-modified header invalid -- time-stamp ignored.\n"));
1084 /* The time-stamping section. */
1089 use_ts = 0; /* no more time-stamping */
1090 count = 0; /* the retrieve count for HEAD is
1092 if (hstat.remote_time && tmr != (time_t) (-1))
1094 /* Now time-stamping can be used validly. Time-stamping
1095 means that if the sizes of the local and remote file
1096 match, and local file is newer than the remote file,
1097 it will not be retrieved. Otherwise, the normal
1098 download procedure is resumed. */
1100 (hstat.contlen == -1 || local_size == hstat.contlen))
1102 if (local_dot_orig_file_exists)
1103 /* We can't collapse this down into just one logprintf()
1104 call with a variable set to u->local or the .orig
1105 filename because we have to malloc() space for the
1106 latter, and because there are multiple returns above (a
1107 coding style no-no by many measures, for reasons such as
1108 this) we'd have to remember to free() the string at each
1109 one to avoid a memory leak. */
1110 logprintf (LOG_VERBOSE, _("\
1111 Server file no newer than local file `%s.orig' -- not retrieving.\n\n"),
1114 logprintf (LOG_VERBOSE, _("\
1115 Server file no newer than local file `%s' -- not retrieving.\n\n"), u->local);
1119 else if (tml >= tmr)
1120 logprintf (LOG_VERBOSE, _("\
1121 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1123 logputs (LOG_VERBOSE,
1124 _("Remote file is newer, retrieving.\n"));
1130 && (tmr != (time_t) (-1))
1132 && ((hstat.len == hstat.contlen) ||
1133 ((hstat.res == 0) &&
1134 ((hstat.contlen == -1) ||
1135 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1137 touch (u->local, tmr);
1139 /* End of time-stamping section. */
1143 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1147 /* It is now safe to free the remainder of hstat, since the
1148 strings within it will no longer be used. */
1151 tmrate = rate (hstat.len - hstat.restval, hstat.dltime);
1153 if (hstat.len == hstat.contlen)
1157 logprintf (LOG_VERBOSE,
1158 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1159 tms, tmrate, locf, hstat.len, hstat.contlen);
1160 logprintf (LOG_NONVERBOSE,
1161 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1162 tms, u->url, hstat.len, hstat.contlen, locf, count);
1165 opt.downloaded += hstat.len;
1166 downloaded_file(ADD_FILE, locf);
1169 else if (hstat.res == 0) /* No read error */
1171 if (hstat.contlen == -1) /* We don't know how much we were supposed
1172 to get, so assume we succeeded. */
1176 logprintf (LOG_VERBOSE,
1177 _("%s (%s) - `%s' saved [%ld]\n\n"),
1178 tms, tmrate, locf, hstat.len);
1179 logprintf (LOG_NONVERBOSE,
1180 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1181 tms, u->url, hstat.len, locf, count);
1184 opt.downloaded += hstat.len;
1185 downloaded_file(ADD_FILE, locf);
1188 else if (hstat.len < hstat.contlen) /* meaning we lost the
1189 connection too soon */
1191 logprintf (LOG_VERBOSE,
1192 _("%s (%s) - Connection closed at byte %ld. "),
1193 tms, tmrate, hstat.len);
1194 printwhat (count, opt.ntry);
1197 else if (!opt.kill_longer) /* meaning we got more than expected */
1199 logprintf (LOG_VERBOSE,
1200 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1201 tms, tmrate, locf, hstat.len, hstat.contlen);
1202 logprintf (LOG_NONVERBOSE,
1203 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1204 tms, u->url, hstat.len, hstat.contlen, locf, count);
1206 opt.downloaded += hstat.len;
1207 downloaded_file(ADD_FILE, locf);
1210 else /* the same, but not accepted */
1212 logprintf (LOG_VERBOSE,
1213 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1214 tms, tmrate, hstat.len, hstat.contlen);
1215 printwhat (count, opt.ntry);
1219 else /* now hstat.res can only be -1 */
1221 if (hstat.contlen == -1)
1223 logprintf (LOG_VERBOSE,
1224 _("%s (%s) - Read error at byte %ld (%s)."),
1225 tms, tmrate, hstat.len, strerror (errno));
1226 printwhat (count, opt.ntry);
1229 else /* hstat.res == -1 and contlen is given */
1231 logprintf (LOG_VERBOSE,
1232 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1233 tms, tmrate, hstat.len, hstat.contlen,
1235 printwhat (count, opt.ntry);
1242 while (!opt.ntry || (count < opt.ntry));
1246 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1247 than local timezone (mktime assumes the latter).
1249 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1250 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO. */
1252 mktime_from_utc (struct tm *t)
1259 tb = mktime (gmtime (&tl));
1260 return (tl <= tb ? (tl + (tl - tb)) : (tl - (tb - tl)));
1263 /* Check whether the result of strptime() indicates success.
1264 strptime() returns the pointer to how far it got to in the string.
1265 The processing has been successful if the string is at `GMT' or
1266 `+X', or at the end of the string.
1268 In extended regexp parlance, the function returns 1 if P matches
1269 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (a valid result of
1270 strptime()) is considered a failure and 0 is returned. */
1276 while (ISSPACE (*p))
1279 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1280 || ((p[0] == '+' || p[1] == '-') && ISDIGIT (p[1])))
1286 /* Convert TIME_STRING time to time_t. TIME_STRING can be in any of
1287 the three formats RFC2068 allows the HTTP servers to emit --
1288 RFC1123-date, RFC850-date or asctime-date. Timezones are ignored,
1291 We use strptime() to recognize various dates, which makes it a
1292 little bit slacker than the RFC1123/RFC850/asctime (e.g. it always
1293 allows shortened dates and months, one-digit days, etc.). It also
1294 allows more than one space anywhere where the specs require one SP.
1295 The routine should probably be even more forgiving (as recommended
1296 by RFC2068), but I do not have the time to write one.
1298 Return the computed time_t representation, or -1 if all the
1301 Needless to say, what we *really* need here is something like
1302 Marcus Hennecke's atotm(), which is forgiving, fast, to-the-point,
1303 and does not use strptime(). atotm() is to be found in the sources
1304 of `phttpd', a little-known HTTP server written by Peter Erikson. */
1306 http_atotm (char *time_string)
1310 /* Roger Beeman says: "This function dynamically allocates struct tm
1311 t, but does no initialization. The only field that actually
1312 needs initialization is tm_isdst, since the others will be set by
1313 strptime. Since strptime does not set tm_isdst, it will return
1314 the data structure with whatever data was in tm_isdst to begin
1315 with. For those of us in timezones where DST can occur, there
1316 can be a one hour shift depending on the previous contents of the
1317 data area where the data structure is allocated." */
1320 /* Note that under foreign locales Solaris strptime() fails to
1321 recognize English dates, which renders this function useless. I
1322 assume that other non-GNU strptime's are plagued by the same
1323 disease. We solve this by setting only LC_MESSAGES in
1324 i18n_initialize(), instead of LC_ALL.
1326 Another solution could be to temporarily set locale to C, invoke
1327 strptime(), and restore it back. This is slow and dirty,
1328 however, and locale support other than LC_MESSAGES can mess other
1329 things, so I rather chose to stick with just setting LC_MESSAGES.
1331 Also note that none of this is necessary under GNU strptime(),
1332 because it recognizes both international and local dates. */
1334 /* NOTE: We don't use `%n' for white space, as OSF's strptime uses
1335 it to eat all white space up to (and including) a newline, and
1336 the function fails if there is no newline (!).
1338 Let's hope all strptime() implementations use ` ' to skip *all*
1339 whitespace instead of just one (it works that way on all the
1340 systems I've tested it on). */
1342 /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1343 if (check_end (strptime (time_string, "%a, %d %b %Y %T", &t)))
1344 return mktime_from_utc (&t);
1345 /* RFC850: Thu, 29-Jan-98 22:12:57 */
1346 if (check_end (strptime (time_string, "%a, %d-%b-%y %T", &t)))
1347 return mktime_from_utc (&t);
1348 /* asctime: Thu Jan 29 22:12:57 1998 */
1349 if (check_end (strptime (time_string, "%a %b %d %T %Y", &t)))
1350 return mktime_from_utc (&t);
1355 /* Authorization support: We support two authorization schemes:
1357 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
1359 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
1360 consisting of answering to the server's challenge with the proper
1363 /* How many bytes it will take to store LEN bytes in base64. */
1364 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
1366 /* Encode the string S of length LENGTH to base64 format and place it
1367 to STORE. STORE will be 0-terminated, and must point to a writable
1368 buffer of at least 1+BASE64_LENGTH(length) bytes. */
1370 base64_encode (const char *s, char *store, int length)
1372 /* Conversion table. */
1373 static char tbl[64] = {
1374 'A','B','C','D','E','F','G','H',
1375 'I','J','K','L','M','N','O','P',
1376 'Q','R','S','T','U','V','W','X',
1377 'Y','Z','a','b','c','d','e','f',
1378 'g','h','i','j','k','l','m','n',
1379 'o','p','q','r','s','t','u','v',
1380 'w','x','y','z','0','1','2','3',
1381 '4','5','6','7','8','9','+','/'
1384 unsigned char *p = (unsigned char *)store;
1386 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
1387 for (i = 0; i < length; i += 3)
1389 *p++ = tbl[s[0] >> 2];
1390 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
1391 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
1392 *p++ = tbl[s[2] & 0x3f];
1395 /* Pad the result if necessary... */
1396 if (i == length + 1)
1398 else if (i == length + 2)
1399 *(p - 1) = *(p - 2) = '=';
1400 /* ...and zero-terminate it. */
1404 /* Create the authentication header contents for the `Basic' scheme.
1405 This is done by encoding the string `USER:PASS' in base64 and
1406 prepending `HEADER: Basic ' to it. */
1408 basic_authentication_encode (const char *user, const char *passwd,
1411 char *t1, *t2, *res;
1412 int len1 = strlen (user) + 1 + strlen (passwd);
1413 int len2 = BASE64_LENGTH (len1);
1415 t1 = (char *)alloca (len1 + 1);
1416 sprintf (t1, "%s:%s", user, passwd);
1417 t2 = (char *)alloca (1 + len2);
1418 base64_encode (t1, t2, len1);
1419 res = (char *)malloc (len2 + 11 + strlen (header));
1420 sprintf (res, "%s: Basic %s\r\n", header, t2);
1426 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
1427 of a field in such a header. If the field is the one specified by
1428 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
1429 digest authorization code), extract its value in the (char*)
1430 variable pointed by RET. Returns negative on a malformed header,
1431 or number of bytes that have been parsed by this call. */
1433 extract_header_attr (const char *au, const char *attr_name, char **ret)
1435 const char *cp, *ep;
1439 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
1441 cp += strlen (attr_name);
1444 cp += skip_lws (cp);
1449 cp += skip_lws (cp);
1454 for (ep = cp; *ep && *ep != '\"'; ep++)
1459 *ret = strdupdelim (cp, ep);
1466 /* Response value needs to be in lowercase, so we cannot use HEXD2ASC
1467 from url.h. See RFC 2069 2.1.2 for the syntax of response-digest. */
1468 #define HEXD2asc(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
1470 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
1471 an array of 16 bytes containing the hash keys, and BUF should be a
1472 buffer of 33 writable characters (32 for hex digits plus one for
1473 zero termination). */
1475 dump_hash (unsigned char *buf, const unsigned char *hash)
1479 for (i = 0; i < MD5_HASHLEN; i++, hash++)
1481 *buf++ = HEXD2asc (*hash >> 4);
1482 *buf++ = HEXD2asc (*hash & 0xf);
1487 /* Take the line apart to find the challenge, and compose a digest
1488 authorization header. See RFC2069 section 2.1.2. */
1490 digest_authentication_encode (const char *au, const char *user,
1491 const char *passwd, const char *method,
1494 static char *realm, *opaque, *nonce;
1499 { "realm", &realm },
1500 { "opaque", &opaque },
1505 realm = opaque = nonce = NULL;
1507 au += 6; /* skip over `Digest' */
1512 au += skip_lws (au);
1513 for (i = 0; i < ARRAY_SIZE (options); i++)
1515 int skip = extract_header_attr (au, options[i].name,
1516 options[i].variable);
1520 FREE_MAYBE (opaque);
1530 if (i == ARRAY_SIZE (options))
1532 while (*au && *au != '=')
1536 au += skip_lws (au);
1540 while (*au && *au != '\"')
1547 while (*au && *au != ',')
1552 if (!realm || !nonce || !user || !passwd || !path || !method)
1555 FREE_MAYBE (opaque);
1560 /* Calculate the digest value. */
1563 unsigned char hash[MD5_HASHLEN];
1564 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
1565 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
1567 /* A1BUF = H(user ":" realm ":" password) */
1568 md5_init_ctx (&ctx);
1569 md5_process_bytes (user, strlen (user), &ctx);
1570 md5_process_bytes (":", 1, &ctx);
1571 md5_process_bytes (realm, strlen (realm), &ctx);
1572 md5_process_bytes (":", 1, &ctx);
1573 md5_process_bytes (passwd, strlen (passwd), &ctx);
1574 md5_finish_ctx (&ctx, hash);
1575 dump_hash (a1buf, hash);
1577 /* A2BUF = H(method ":" path) */
1578 md5_init_ctx (&ctx);
1579 md5_process_bytes (method, strlen (method), &ctx);
1580 md5_process_bytes (":", 1, &ctx);
1581 md5_process_bytes (path, strlen (path), &ctx);
1582 md5_finish_ctx (&ctx, hash);
1583 dump_hash (a2buf, hash);
1585 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
1586 md5_init_ctx (&ctx);
1587 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
1588 md5_process_bytes (":", 1, &ctx);
1589 md5_process_bytes (nonce, strlen (nonce), &ctx);
1590 md5_process_bytes (":", 1, &ctx);
1591 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
1592 md5_finish_ctx (&ctx, hash);
1593 dump_hash (response_digest, hash);
1595 res = (char*) xmalloc (strlen (user)
1600 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
1601 + (opaque ? strlen (opaque) : 0)
1603 sprintf (res, "Authorization: Digest \
1604 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
1605 user, realm, nonce, path, response_digest);
1608 char *p = res + strlen (res);
1609 strcat (p, ", opaque=\"");
1613 strcat (res, "\r\n");
1617 #endif /* USE_DIGEST */
1620 #define HACK_O_MATIC(line, string_constant) \
1621 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1622 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1623 || !line[sizeof (string_constant) - 1]))
1626 known_authentication_scheme_p (const char *au)
1628 return HACK_O_MATIC (au, "Basic") || HACK_O_MATIC (au, "Digest");
1633 /* Create the HTTP authorization request header. When the
1634 `WWW-Authenticate' response header is seen, according to the
1635 authorization scheme specified in that header (`Basic' and `Digest'
1636 are supported by the current implementation), produce an
1637 appropriate HTTP authorization request header. */
1639 create_authorization_line (const char *au, const char *user,
1640 const char *passwd, const char *method,
1643 char *wwwauth = NULL;
1645 if (!strncasecmp (au, "Basic", 5))
1646 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
1648 else if (!strncasecmp (au, "Digest", 6))
1649 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
1650 #endif /* USE_DIGEST */