2 Copyright (C) 1995, 1996, 1997, 1998, 2000 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);
257 /* Check whether the `Connection' header is set to "keep-alive". */
259 http_process_connection (const char *hdr, void *arg)
261 int *flag = (int *)arg;
262 if (!strcasecmp (hdr, "Keep-Alive"))
267 /* Persistent connections. Currently, we cache the most recently used
268 connection as persistent, provided that the HTTP server agrees to
269 make it such. The persistence data is stored in the variables
270 below. Ideally, it would be in a structure, and it should be
271 possible to cache an arbitrary fixed number of these connections.
273 I think the code is quite easy to extend in that direction. */
275 /* Whether a persistent connection is active. */
276 static int pc_active_p;
278 /* Host and port of currently active persistent connection. */
279 static unsigned char pc_last_host[4];
280 static unsigned short pc_last_port;
282 /* File descriptor of the currently active persistent connection. */
283 static int pc_last_fd;
285 /* Mark the persistent connection as invalid. This is used by the
286 CLOSE_* macros after they forcefully close a registered persistent
287 connection. This does not close the file descriptor -- it is left
288 to the caller to do that. (Maybe it should, though.) */
291 invalidate_persistent (void)
294 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
297 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
298 persistent. This will enable someone to use the same connection
299 later. In the context of HTTP, this must be called only AFTER the
300 response has been received and the server has promised that the
301 connection will remain alive.
303 If a previous connection was persistent, it is closed. */
306 register_persistent (const char *host, unsigned short port, int fd)
312 if (pc_last_fd == fd)
314 /* The connection FD is already registered. Nothing to
320 /* The old persistent connection is still active; let's
321 close it first. This situation arises whenever a
322 persistent connection exists, but we then connect to a
323 different host, and try to register a persistent
324 connection to that one. */
326 invalidate_persistent ();
330 /* This store_hostaddress may not fail, because it has the results
332 success = store_hostaddress (pc_last_host, host);
337 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
340 /* Return non-zero if a persistent connection is available for
341 connecting to HOST:PORT. */
344 persistent_available_p (const char *host, unsigned short port)
346 unsigned char this_host[4];
347 /* First, check whether a persistent connection is active at all. */
350 /* Second, check if the active connection pertains to the correct
351 (HOST, PORT) ordered pair. */
352 if (port != pc_last_port)
354 if (!store_hostaddress (this_host, host))
356 if (memcmp (pc_last_host, this_host, 4))
358 /* Third: check whether the connection is still open. This is
359 important because most server implement a liberal (short) timeout
360 on persistent connections. Wget can of course always reconnect
361 if the connection doesn't work out, but it's nicer to know in
362 advance. This test is a logical followup of the first test, but
363 is "expensive" and therefore placed at the end of the list. */
364 if (!test_socket_open (pc_last_fd))
366 /* Oops, the socket is no longer open. Now that we know that,
367 let's invalidate the persistent connection before returning
370 invalidate_persistent ();
376 /* The idea behind these two CLOSE macros is to distinguish between
377 two cases: one when the job we've been doing is finished, and we
378 want to close the connection and leave, and two when something is
379 seriously wrong and we're closing the connection as part of
382 In case of keep_alive, CLOSE_FINISH should leave the connection
383 open, while CLOSE_INVALIDATE should still close it.
385 Note that the semantics of the flag `keep_alive' is "this
386 connection *will* be reused (the server has promised not to close
387 the connection once we're done)", while the semantics of
388 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
389 active, registered connection". */
391 #define CLOSE_FINISH(fd) do { \
395 if (pc_active_p && (fd) == pc_last_fd) \
396 invalidate_persistent (); \
400 #define CLOSE_INVALIDATE(fd) do { \
402 if (pc_active_p && (fd) == pc_last_fd) \
403 invalidate_persistent (); \
409 long len; /* received length */
410 long contlen; /* expected length */
411 long restval; /* the restart value */
412 int res; /* the result of last read */
413 char *newloc; /* new location (redirection) */
414 char *remote_time; /* remote time-stamp string */
415 char *error; /* textual HTTP error */
416 int statcode; /* status code */
417 long dltime; /* time of the download */
420 /* Free the elements of hstat X. */
421 #define FREEHSTAT(x) do \
423 FREE_MAYBE ((x).newloc); \
424 FREE_MAYBE ((x).remote_time); \
425 FREE_MAYBE ((x).error); \
426 (x).newloc = (x).remote_time = (x).error = NULL; \
429 static char *create_authorization_line PARAMS ((const char *, const char *,
430 const char *, const char *,
432 static char *basic_authentication_encode PARAMS ((const char *, const char *,
434 static int known_authentication_scheme_p PARAMS ((const char *));
436 static time_t http_atotm PARAMS ((char *));
438 #define BEGINS_WITH(line, string_constant) \
439 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
440 && (ISSPACE (line[sizeof (string_constant) - 1]) \
441 || !line[sizeof (string_constant) - 1]))
443 /* Retrieve a document through HTTP protocol. It recognizes status
444 code, and correctly handles redirections. It closes the network
445 socket. If it receives an error from the functions below it, it
446 will print it if there is enough information to do so (almost
447 always), returning the error to the caller (i.e. http_loop).
449 Various HTTP parameters are stored to hs. Although it parses the
450 response code correctly, it is not used in a sane way. The caller
453 If u->proxy is non-NULL, the URL u will be taken as a proxy URL,
454 and u->proxy->url will be given to the proxy server (bad naming,
457 gethttp (struct urlinfo *u, struct http_stat *hs, int *dt)
459 char *request, *type, *command, *path;
461 char *pragma_h, *referer, *useragent, *range, *wwwauth, *remhost;
462 char *authenticate_h;
466 char *request_keep_alive;
467 int sock, hcount, num_written, all_length, remport, statcode;
468 long contlen, contrange;
472 int auth_tried_already;
475 /* Whether this connection will be kept alive after the HTTP request
479 /* Flags that detect the two ways of specifying HTTP keep-alive
481 int http_keep_alive_1, http_keep_alive_2;
483 /* Whether keep-alive should be inhibited. */
484 int inhibit_keep_alive;
486 if (!(*dt & HEAD_ONLY))
487 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
488 know the local filename so we can save to it. */
489 assert (u->local != NULL);
492 auth_tried_already = 0;
494 inhibit_keep_alive = (!opt.http_keep_alive || u->proxy != NULL);
497 /* We need to come back here when the initial attempt to retrieve
498 without authorization header fails. (Expected to happen at least
499 for the Digest authorization scheme.) */
502 http_keep_alive_1 = http_keep_alive_2 = 0;
504 /* Initialize certain elements of struct http_stat. */
509 hs->remote_time = NULL;
512 /* Which structure to use to retrieve the original URL data. */
518 /* First: establish the connection. */
519 if (inhibit_keep_alive
520 || !persistent_available_p (u->host, u->port))
522 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "), u->host, u->port);
523 err = make_connection (&sock, u->host, u->port);
527 logputs (LOG_VERBOSE, "\n");
528 logprintf (LOG_NOTQUIET, "%s: %s.\n", u->host, herrmsg (h_errno));
532 logputs (LOG_VERBOSE, "\n");
533 logprintf (LOG_NOTQUIET, "socket: %s\n", strerror (errno));
537 logputs (LOG_VERBOSE, "\n");
538 logprintf (LOG_NOTQUIET,
539 _("Connection to %s:%hu refused.\n"), u->host, u->port);
543 logputs (LOG_VERBOSE, "\n");
544 logprintf (LOG_NOTQUIET, "connect: %s\n", strerror (errno));
549 /* Everything is fine! */
550 logputs (LOG_VERBOSE, _("connected!\n"));
559 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"), u->host, u->port);
560 /* #### pc_last_fd should be accessed through an accessor
563 DEBUGP (("Reusing fd %d.\n", sock));
567 path = u->proxy->url;
571 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
575 referer = (char *)alloca (9 + strlen (ou->referer) + 3);
576 sprintf (referer, "Referer: %s\r\n", ou->referer);
578 if (*dt & SEND_NOCACHE)
579 pragma_h = "Pragma: no-cache\r\n";
584 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
585 /* Gag me! Some servers (e.g. WebSitePro) have been known to
586 respond to the following `Range' format by generating a
587 multipart/x-byte-ranges MIME document! This MIME type was
588 present in an old draft of the byteranges specification.
589 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
590 only if multiple non-overlapping ranges are requested --
591 which Wget never does. */
592 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
597 STRDUP_ALLOCA (useragent, opt.useragent);
600 useragent = (char *)alloca (10 + strlen (version_string));
601 sprintf (useragent, "Wget/%s", version_string);
603 /* Construct the authentication, if userid is present. */
606 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
607 user = user ? user : opt.http_user;
608 passwd = passwd ? passwd : opt.http_passwd;
615 /* We have the username and the password, but haven't tried
616 any authorization yet. Let's see if the "Basic" method
617 works. If not, we'll come back here and construct a
618 proper authorization method with the right challenges.
620 If we didn't employ this kind of logic, every URL that
621 requires authorization would have to be processed twice,
622 which is very suboptimal and generates a bunch of false
623 "unauthorized" errors in the server log.
625 #### But this logic also has a serious problem when used
626 with stronger authentications: we *first* transmit the
627 username and the password in clear text, and *then*
628 attempt a stronger authentication scheme. That cannot be
629 right! We are only fortunate that almost everyone still
630 uses the `Basic' scheme anyway.
632 There should be an option to prevent this from happening,
633 for those who use strong authentication schemes and value
635 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
639 wwwauth = create_authorization_line (authenticate_h, user, passwd,
647 char *proxy_user, *proxy_passwd;
648 /* For normal username and password, URL components override
649 command-line/wgetrc parameters. With proxy authentication,
650 it's the reverse, because proxy URLs are normally the
651 "permanent" ones, so command-line args should take
653 if (opt.proxy_user && opt.proxy_passwd)
655 proxy_user = opt.proxy_user;
656 proxy_passwd = opt.proxy_passwd;
660 proxy_user = u->user;
661 proxy_passwd = u->passwd;
663 /* #### This is junky. Can't the proxy request, say, `Digest'
665 if (proxy_user && proxy_passwd)
666 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
667 "Proxy-Authorization");
672 /* String of the form :PORT. Used only for non-standard ports. */
676 port_maybe = (char *)alloca (numdigit (remport) + 2);
677 sprintf (port_maybe, ":%d", remport);
680 if (!inhibit_keep_alive)
681 request_keep_alive = "Connection: Keep-Alive\r\n";
683 request_keep_alive = NULL;
685 /* Allocate the memory for the request. */
686 request = (char *)alloca (strlen (command) + strlen (path)
689 + (port_maybe ? strlen (port_maybe) : 0)
690 + strlen (HTTP_ACCEPT)
691 + (request_keep_alive
692 ? strlen (request_keep_alive) : 0)
693 + (referer ? strlen (referer) : 0)
694 + (wwwauth ? strlen (wwwauth) : 0)
695 + (proxyauth ? strlen (proxyauth) : 0)
696 + (range ? strlen (range) : 0)
698 + (opt.user_header ? strlen (opt.user_header) : 0)
700 /* Construct the request. */
707 command, path, useragent, remhost,
708 port_maybe ? port_maybe : "",
710 request_keep_alive ? request_keep_alive : "",
711 referer ? referer : "",
712 wwwauth ? wwwauth : "",
713 proxyauth ? proxyauth : "",
716 opt.user_header ? opt.user_header : "");
717 DEBUGP (("---request begin---\n%s---request end---\n", request));
718 /* Free the temporary memory. */
719 FREE_MAYBE (wwwauth);
720 FREE_MAYBE (proxyauth);
722 /* Send the request to server. */
723 num_written = iwrite (sock, request, strlen (request));
726 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
728 CLOSE_INVALIDATE (sock);
731 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
732 u->proxy ? "Proxy" : "HTTP");
733 contlen = contrange = -1;
738 /* Before reading anything, initialize the rbuf. */
739 rbuf_initialize (&rbuf, sock);
743 /* Header-fetching loop. */
751 /* Get the header. */
752 status = header_get (&rbuf, &hdr,
753 /* Disallow continuations for status line. */
754 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
756 /* Check for errors. */
757 if (status == HG_EOF && *hdr)
759 /* This used to be an unconditional error, but that was
760 somewhat controversial, because of a large number of
761 broken CGI's that happily "forget" to send the second EOL
762 before closing the connection of a HEAD request.
764 So, the deal is to check whether the header is empty
765 (*hdr is zero if it is); if yes, it means that the
766 previous header was fully retrieved, and that -- most
767 probably -- the request is complete. "...be liberal in
768 what you accept." Oh boy. */
769 logputs (LOG_VERBOSE, "\n");
770 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
773 FREE_MAYBE (hs->newloc);
774 FREE_MAYBE (all_headers);
775 CLOSE_INVALIDATE (sock);
778 else if (status == HG_ERROR)
780 logputs (LOG_VERBOSE, "\n");
781 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
785 FREE_MAYBE (hs->newloc);
786 FREE_MAYBE (all_headers);
787 CLOSE_INVALIDATE (sock);
791 /* If the headers are to be saved to a file later, save them to
793 if (opt.save_headers)
795 int lh = strlen (hdr);
796 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
797 memcpy (all_headers + all_length, hdr, lh);
799 all_headers[all_length++] = '\n';
800 all_headers[all_length] = '\0';
803 /* Print the header if requested. */
804 if (opt.server_response && hcount != 1)
805 logprintf (LOG_VERBOSE, "\n%d %s", hcount, hdr);
807 /* Check for status line. */
811 /* Parse the first line of server response. */
812 statcode = parse_http_status_line (hdr, &error);
813 hs->statcode = statcode;
814 /* Store the descriptive response. */
815 if (statcode == -1) /* malformed response */
817 /* A common reason for "malformed response" error is the
818 case when no data was actually received. Handle this
821 hs->error = xstrdup (_("No data received"));
823 hs->error = xstrdup (_("Malformed status line"));
828 hs->error = xstrdup (_("(no description)"));
830 hs->error = xstrdup (error);
837 logprintf (LOG_VERBOSE, "%d %s", statcode, error);
842 /* Exit on empty header. */
849 /* Try getting content-length. */
850 if (contlen == -1 && !opt.ignore_length)
851 if (header_process (hdr, "Content-Length", header_extract_number,
854 /* Try getting content-type. */
856 if (header_process (hdr, "Content-Type", http_process_type, &type))
858 /* Try getting location. */
860 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
862 /* Try getting last-modified. */
863 if (!hs->remote_time)
864 if (header_process (hdr, "Last-Modified", header_strdup,
867 /* Try getting www-authentication. */
869 if (header_process (hdr, "WWW-Authenticate", header_strdup,
872 /* Check for accept-ranges header. If it contains the word
873 `none', disable the ranges. */
874 if (*dt & ACCEPTRANGES)
877 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
880 *dt &= ~ACCEPTRANGES;
884 /* Try getting content-range. */
887 struct http_process_range_closure closure;
888 if (header_process (hdr, "Content-Range", http_process_range, &closure))
890 contrange = closure.first_byte_pos;
894 /* Check for keep-alive related responses. */
895 if (!inhibit_keep_alive)
897 /* Check for the `Keep-Alive' header. */
898 if (!http_keep_alive_1)
900 if (header_process (hdr, "Keep-Alive", header_exists,
904 /* Check for `Connection: Keep-Alive'. */
905 if (!http_keep_alive_2)
907 if (header_process (hdr, "Connection", http_process_connection,
916 logputs (LOG_VERBOSE, "\n");
919 && (http_keep_alive_1 || http_keep_alive_2))
921 assert (inhibit_keep_alive == 0);
925 /* The server has promised that it will not close the connection
926 when we're done. This means that we can register it. */
927 register_persistent (u->host, u->port, sock);
929 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
932 /* Authorization is required. */
937 if (auth_tried_already)
939 /* If we have tried it already, then there is not point
942 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
943 free (authenticate_h);
946 else if (!known_authentication_scheme_p (authenticate_h))
948 free (authenticate_h);
949 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
952 else if (BEGINS_WITH (authenticate_h, "Basic"))
954 /* The authentication scheme is basic, the one we try by
955 default, and it failed. There's no sense in trying
961 auth_tried_already = 1;
965 /* We do not need this anymore. */
968 free (authenticate_h);
969 authenticate_h = NULL;
972 /* 20x responses are counted among successful by default. */
973 if (H_20X (statcode))
976 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
979 /* We don't assume text/html by default. */
982 if (opt.html_extension && (*dt & TEXTHTML))
983 /* -E / --html-extension / html_extension = on was specified, and this is a
984 text/html file. If some case-insensitive variation on ".htm[l]" isn't
985 already the file's suffix, tack on ".html". */
987 char* last_period_in_local_filename = strrchr(u->local, '.');
989 if (last_period_in_local_filename == NULL ||
990 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
991 strcasecmp(last_period_in_local_filename, ".html") == EQ))
993 size_t local_filename_len = strlen(u->local);
995 u->local = xrealloc(u->local, local_filename_len + sizeof(".html"));
996 strcpy(u->local + local_filename_len, ".html");
998 *dt |= ADDED_HTML_EXTENSION;
1002 if (contrange == -1)
1004 else if (contrange != hs->restval ||
1005 (H_PARTIAL (statcode) && contrange == -1))
1007 /* This means the whole request was somehow misunderstood by the
1008 server. Bail out. */
1010 FREE_MAYBE (hs->newloc);
1011 FREE_MAYBE (all_headers);
1012 CLOSE_INVALIDATE (sock);
1019 contlen += contrange;
1021 contrange = -1; /* If conent-length was not sent,
1022 content-range will be ignored. */
1024 hs->contlen = contlen;
1026 /* Return if redirected. */
1027 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1029 /* RFC2068 says that in case of the 300 (multiple choices)
1030 response, the server can output a preferred URL through
1031 `Location' header; otherwise, the request should be treated
1032 like GET. So, if the location is set, it will be a
1033 redirection; otherwise, just proceed normally. */
1034 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1038 logprintf (LOG_VERBOSE,
1039 _("Location: %s%s\n"),
1040 hs->newloc ? hs->newloc : _("unspecified"),
1041 hs->newloc ? _(" [following]") : "");
1042 CLOSE_FINISH (sock);
1044 FREE_MAYBE (all_headers);
1050 if ((*dt & RETROKF) && !opt.server_response)
1052 /* No need to print this output if the body won't be
1053 downloaded at all, or if the original server response is
1055 logputs (LOG_VERBOSE, _("Length: "));
1058 logputs (LOG_VERBOSE, legible (contlen));
1059 if (contrange != -1)
1060 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1061 legible (contlen - contrange));
1064 logputs (LOG_VERBOSE,
1065 opt.ignore_length ? _("ignored") : _("unspecified"));
1067 logprintf (LOG_VERBOSE, " [%s]\n", type);
1069 logputs (LOG_VERBOSE, "\n");
1073 type = NULL; /* We don't need it any more. */
1075 /* Return if we have no intention of further downloading. */
1076 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1078 /* In case someone cares to look... */
1082 FREE_MAYBE (all_headers);
1083 CLOSE_FINISH (sock);
1084 return RETRFINISHED;
1087 /* Open the local file. */
1090 mkalldirs (u->local);
1092 rotate_backups (u->local);
1093 fp = fopen (u->local, hs->restval ? "ab" : "wb");
1096 logprintf (LOG_NOTQUIET, "%s: %s\n", u->local, strerror (errno));
1097 CLOSE_FINISH (sock);
1098 FREE_MAYBE (all_headers);
1107 /* This will silently fail for streams that don't correspond
1108 to regular files, but that's OK. */
1114 /* #### This confuses the code that checks for file size. There
1115 should be some overhead information. */
1116 if (opt.save_headers)
1117 fwrite (all_headers, 1, all_length, fp);
1119 /* Get the contents of the document. */
1120 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1121 (contlen != -1 ? contlen : 0),
1123 hs->dltime = elapsed_time ();
1125 /* Close or flush the file. We have to be careful to check for
1126 error here. Checking the result of fwrite() is not enough --
1127 errors could go unnoticed! */
1130 flush_res = fclose (fp);
1132 flush_res = fflush (fp);
1133 if (flush_res == EOF)
1136 FREE_MAYBE (all_headers);
1137 CLOSE_FINISH (sock);
1140 return RETRFINISHED;
1143 /* The genuine HTTP loop! This is the part where the retrieval is
1144 retried, and retried, and retried, and... */
1146 http_loop (struct urlinfo *u, char **newloc, int *dt)
1148 static int first_retrieval = 1;
1151 int use_ts, got_head = 0; /* time-stamping info */
1152 char *filename_plus_orig_suffix;
1153 char *local_filename = NULL;
1154 char *tms, *suf, *locf, *tmrate;
1156 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1157 long local_size = 0; /* the size of the local file */
1158 size_t filename_len;
1159 struct http_stat hstat; /* HTTP status */
1164 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1165 has_wildcards_p because it would also warn on `?', and we know that
1166 shows up in CGI paths a *lot*. */
1167 if (strchr (u->url, '*'))
1168 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1170 /* Determine the local filename. */
1172 u->local = url_filename (u->proxy ? u->proxy : u);
1174 if (!opt.output_document)
1177 locf = opt.output_document;
1179 /* Yuck. Multiple returns suck. We need to remember to free() the space we
1180 xmalloc() here before EACH return. This is one reason it's better to set
1181 flags that influence flow control and then return once at the end. */
1182 filename_len = strlen(u->local);
1183 filename_plus_orig_suffix = xmalloc(filename_len + sizeof(".orig"));
1185 if (opt.noclobber && file_exists_p (u->local))
1187 /* If opt.noclobber is turned on and file already exists, do not
1188 retrieve the file */
1189 logprintf (LOG_VERBOSE, _("\
1190 File `%s' already there, will not retrieve.\n"), u->local);
1191 /* If the file is there, we suppose it's retrieved OK. */
1194 /* #### Bogusness alert. */
1195 /* If its suffix is "html" or (yuck!) "htm", we suppose it's
1196 text/html, a harmless lie. */
1197 if (((suf = suffix (u->local)) != NULL)
1198 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
1201 free(filename_plus_orig_suffix); /* must precede every return! */
1202 /* Another harmless lie: */
1207 if (opt.timestamping)
1209 boolean local_dot_orig_file_exists = FALSE;
1211 if (opt.backup_converted)
1212 /* If -K is specified, we'll act on the assumption that it was specified
1213 last time these files were downloaded as well, and instead of just
1214 comparing local file X against server file X, we'll compare local
1215 file X.orig (if extant, else X) against server file X. If -K
1216 _wasn't_ specified last time, or the server contains files called
1217 *.orig, -N will be back to not operating correctly with -k. */
1219 /* Would a single s[n]printf() call be faster? --dan
1221 It wouldn't. sprintf() is horribly slow. At one point I
1222 profiled Wget, and found that a measurable and
1223 non-negligible amount of time was lost calling sprintf()
1224 in url.c. Replacing sprintf with inline calls to
1225 strcpy() and long_to_string() made a difference.
1227 strcpy(filename_plus_orig_suffix, u->local);
1228 strcpy(filename_plus_orig_suffix + filename_len, ".orig");
1230 /* Try to stat() the .orig file. */
1231 if (stat(filename_plus_orig_suffix, &st) == 0)
1233 local_dot_orig_file_exists = TRUE;
1234 local_filename = filename_plus_orig_suffix;
1238 if (!local_dot_orig_file_exists)
1239 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1240 if (stat (u->local, &st) == 0)
1241 local_filename = u->local;
1243 if (local_filename != NULL)
1244 /* There was a local file, so we'll check later to see if the version
1245 the server has is the same version we already have, allowing us to
1250 local_size = st.st_size;
1254 /* Reset the counter. */
1256 *dt = 0 | ACCEPTRANGES;
1260 /* Increment the pass counter. */
1262 /* Wait before the retrieval (unless this is the very first
1264 Check if we are retrying or not, wait accordingly - HEH */
1265 if (!first_retrieval && (opt.wait || (count && opt.waitretry)))
1269 if (count<opt.waitretry)
1272 sleep(opt.waitretry);
1277 if (first_retrieval)
1278 first_retrieval = 0;
1279 /* Get the current time string. */
1280 tms = time_str (NULL);
1281 /* Print fetch message, if opt.verbose. */
1284 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1288 sprintf (tmp, _("(try:%2d)"), count);
1289 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1290 tms, hurl, tmp, locf);
1292 ws_changetitle (hurl, 1);
1297 /* Default document type is empty. However, if spider mode is
1298 on or time-stamping is employed, HEAD_ONLY commands is
1299 encoded within *dt. */
1300 if (opt.spider || (use_ts && !got_head))
1304 /* Assume no restarting. */
1306 /* Decide whether or not to restart. */
1307 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1308 && file_exists_p (u->local))
1309 if (stat (u->local, &st) == 0)
1310 hstat.restval = st.st_size;
1311 /* Decide whether to send the no-cache directive. */
1312 if (u->proxy && (count > 1 || (opt.proxy_cache == 0)))
1313 *dt |= SEND_NOCACHE;
1315 *dt &= ~SEND_NOCACHE;
1317 /* Try fetching the document, or at least its head. :-) */
1318 err = gethttp (u, &hstat, dt);
1320 /* It's unfortunate that wget determines the local filename before finding
1321 out the Content-Type of the file. Barring a major restructuring of the
1322 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1323 u->local to tack on ".html". */
1324 if (!opt.output_document)
1327 locf = opt.output_document;
1330 tms = time_str (NULL);
1331 /* Get the new location (with or without the redirection). */
1333 *newloc = xstrdup (hstat.newloc);
1336 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1337 case CONERROR: case READERR: case WRITEFAILED:
1339 /* Non-fatal errors continue executing the loop, which will
1340 bring them to "while" statement at the end, to judge
1341 whether the number of tries was exceeded. */
1343 printwhat (count, opt.ntry);
1346 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1347 /* Fatal errors just return from the function. */
1349 free(filename_plus_orig_suffix); /* must precede every return! */
1352 case FWRITEERR: case FOPENERR:
1353 /* Another fatal error. */
1354 logputs (LOG_VERBOSE, "\n");
1355 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1356 u->local, strerror (errno));
1358 free(filename_plus_orig_suffix); /* must precede every return! */
1362 /* Return the new location to the caller. */
1365 logprintf (LOG_NOTQUIET,
1366 _("ERROR: Redirection (%d) without location.\n"),
1368 free(filename_plus_orig_suffix); /* must precede every return! */
1372 free(filename_plus_orig_suffix); /* must precede every return! */
1376 /* Deal with you later. */
1379 /* All possibilities should have been exhausted. */
1382 if (!(*dt & RETROKF))
1386 /* #### Ugly ugly ugly! */
1387 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1388 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1391 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1392 tms, hstat.statcode, hstat.error);
1393 logputs (LOG_VERBOSE, "\n");
1395 free(filename_plus_orig_suffix); /* must precede every return! */
1399 /* Did we get the time-stamp? */
1402 if (opt.timestamping && !hstat.remote_time)
1404 logputs (LOG_NOTQUIET, _("\
1405 Last-modified header missing -- time-stamps turned off.\n"));
1407 else if (hstat.remote_time)
1409 /* Convert the date-string into struct tm. */
1410 tmr = http_atotm (hstat.remote_time);
1411 if (tmr == (time_t) (-1))
1412 logputs (LOG_VERBOSE, _("\
1413 Last-modified header invalid -- time-stamp ignored.\n"));
1417 /* The time-stamping section. */
1422 use_ts = 0; /* no more time-stamping */
1423 count = 0; /* the retrieve count for HEAD is
1425 if (hstat.remote_time && tmr != (time_t) (-1))
1427 /* Now time-stamping can be used validly. Time-stamping
1428 means that if the sizes of the local and remote file
1429 match, and local file is newer than the remote file,
1430 it will not be retrieved. Otherwise, the normal
1431 download procedure is resumed. */
1433 (hstat.contlen == -1 || local_size == hstat.contlen))
1435 logprintf (LOG_VERBOSE, _("\
1436 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1439 free(filename_plus_orig_suffix);/*must precede every return!*/
1442 else if (tml >= tmr)
1443 logprintf (LOG_VERBOSE, _("\
1444 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1446 logputs (LOG_VERBOSE,
1447 _("Remote file is newer, retrieving.\n"));
1453 && (tmr != (time_t) (-1))
1455 && ((hstat.len == hstat.contlen) ||
1456 ((hstat.res == 0) &&
1457 ((hstat.contlen == -1) ||
1458 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1460 touch (u->local, tmr);
1462 /* End of time-stamping section. */
1466 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1467 free(filename_plus_orig_suffix); /* must precede every return! */
1471 /* It is now safe to free the remainder of hstat, since the
1472 strings within it will no longer be used. */
1475 tmrate = rate (hstat.len - hstat.restval, hstat.dltime);
1477 if (hstat.len == hstat.contlen)
1481 logprintf (LOG_VERBOSE,
1482 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1483 tms, tmrate, locf, hstat.len, hstat.contlen);
1484 logprintf (LOG_NONVERBOSE,
1485 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1486 tms, u->url, hstat.len, hstat.contlen, locf, count);
1489 downloaded_increase (hstat.len);
1491 /* Remember that we downloaded the file for later ".orig" code. */
1492 if (*dt & ADDED_HTML_EXTENSION)
1493 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1495 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1497 free(filename_plus_orig_suffix); /* must precede every return! */
1500 else if (hstat.res == 0) /* No read error */
1502 if (hstat.contlen == -1) /* We don't know how much we were supposed
1503 to get, so assume we succeeded. */
1507 logprintf (LOG_VERBOSE,
1508 _("%s (%s) - `%s' saved [%ld]\n\n"),
1509 tms, tmrate, locf, hstat.len);
1510 logprintf (LOG_NONVERBOSE,
1511 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1512 tms, u->url, hstat.len, locf, count);
1515 downloaded_increase (hstat.len);
1517 /* Remember that we downloaded the file for later ".orig" code. */
1518 if (*dt & ADDED_HTML_EXTENSION)
1519 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1521 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1523 free(filename_plus_orig_suffix); /* must precede every return! */
1526 else if (hstat.len < hstat.contlen) /* meaning we lost the
1527 connection too soon */
1529 logprintf (LOG_VERBOSE,
1530 _("%s (%s) - Connection closed at byte %ld. "),
1531 tms, tmrate, hstat.len);
1532 printwhat (count, opt.ntry);
1535 else if (!opt.kill_longer) /* meaning we got more than expected */
1537 logprintf (LOG_VERBOSE,
1538 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1539 tms, tmrate, locf, hstat.len, hstat.contlen);
1540 logprintf (LOG_NONVERBOSE,
1541 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1542 tms, u->url, hstat.len, hstat.contlen, locf, count);
1544 downloaded_increase (hstat.len);
1546 /* Remember that we downloaded the file for later ".orig" code. */
1547 if (*dt & ADDED_HTML_EXTENSION)
1548 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1550 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1552 free(filename_plus_orig_suffix); /* must precede every return! */
1555 else /* the same, but not accepted */
1557 logprintf (LOG_VERBOSE,
1558 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1559 tms, tmrate, hstat.len, hstat.contlen);
1560 printwhat (count, opt.ntry);
1564 else /* now hstat.res can only be -1 */
1566 if (hstat.contlen == -1)
1568 logprintf (LOG_VERBOSE,
1569 _("%s (%s) - Read error at byte %ld (%s)."),
1570 tms, tmrate, hstat.len, strerror (errno));
1571 printwhat (count, opt.ntry);
1574 else /* hstat.res == -1 and contlen is given */
1576 logprintf (LOG_VERBOSE,
1577 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1578 tms, tmrate, hstat.len, hstat.contlen,
1580 printwhat (count, opt.ntry);
1587 while (!opt.ntry || (count < opt.ntry));
1588 free(filename_plus_orig_suffix); /* must precede every return! */
1592 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1593 than local timezone (mktime assumes the latter).
1595 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1596 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO. */
1598 mktime_from_utc (struct tm *t)
1605 tb = mktime (gmtime (&tl));
1606 return (tl <= tb ? (tl + (tl - tb)) : (tl - (tb - tl)));
1609 /* Check whether the result of strptime() indicates success.
1610 strptime() returns the pointer to how far it got to in the string.
1611 The processing has been successful if the string is at `GMT' or
1612 `+X', or at the end of the string.
1614 In extended regexp parlance, the function returns 1 if P matches
1615 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (a valid result of
1616 strptime()) is considered a failure and 0 is returned. */
1618 check_end (const char *p)
1622 while (ISSPACE (*p))
1625 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1626 || ((p[0] == '+' || p[1] == '-') && ISDIGIT (p[1])))
1632 /* Convert TIME_STRING time to time_t. TIME_STRING can be in any of
1633 the three formats RFC2068 allows the HTTP servers to emit --
1634 RFC1123-date, RFC850-date or asctime-date. Timezones are ignored,
1637 We use strptime() to recognize various dates, which makes it a
1638 little bit slacker than the RFC1123/RFC850/asctime (e.g. it always
1639 allows shortened dates and months, one-digit days, etc.). It also
1640 allows more than one space anywhere where the specs require one SP.
1641 The routine should probably be even more forgiving (as recommended
1642 by RFC2068), but I do not have the time to write one.
1644 Return the computed time_t representation, or -1 if all the
1647 Needless to say, what we *really* need here is something like
1648 Marcus Hennecke's atotm(), which is forgiving, fast, to-the-point,
1649 and does not use strptime(). atotm() is to be found in the sources
1650 of `phttpd', a little-known HTTP server written by Peter Erikson. */
1652 http_atotm (char *time_string)
1656 /* Roger Beeman says: "This function dynamically allocates struct tm
1657 t, but does no initialization. The only field that actually
1658 needs initialization is tm_isdst, since the others will be set by
1659 strptime. Since strptime does not set tm_isdst, it will return
1660 the data structure with whatever data was in tm_isdst to begin
1661 with. For those of us in timezones where DST can occur, there
1662 can be a one hour shift depending on the previous contents of the
1663 data area where the data structure is allocated." */
1666 /* Note that under foreign locales Solaris strptime() fails to
1667 recognize English dates, which renders this function useless. I
1668 assume that other non-GNU strptime's are plagued by the same
1669 disease. We solve this by setting only LC_MESSAGES in
1670 i18n_initialize(), instead of LC_ALL.
1672 Another solution could be to temporarily set locale to C, invoke
1673 strptime(), and restore it back. This is slow and dirty,
1674 however, and locale support other than LC_MESSAGES can mess other
1675 things, so I rather chose to stick with just setting LC_MESSAGES.
1677 Also note that none of this is necessary under GNU strptime(),
1678 because it recognizes both international and local dates. */
1680 /* NOTE: We don't use `%n' for white space, as OSF's strptime uses
1681 it to eat all white space up to (and including) a newline, and
1682 the function fails if there is no newline (!).
1684 Let's hope all strptime() implementations use ` ' to skip *all*
1685 whitespace instead of just one (it works that way on all the
1686 systems I've tested it on). */
1688 /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1689 if (check_end (strptime (time_string, "%a, %d %b %Y %T", &t)))
1690 return mktime_from_utc (&t);
1691 /* RFC850: Thu, 29-Jan-98 22:12:57 */
1692 if (check_end (strptime (time_string, "%a, %d-%b-%y %T", &t)))
1693 return mktime_from_utc (&t);
1694 /* asctime: Thu Jan 29 22:12:57 1998 */
1695 if (check_end (strptime (time_string, "%a %b %d %T %Y", &t)))
1696 return mktime_from_utc (&t);
1701 /* Authorization support: We support two authorization schemes:
1703 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
1705 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
1706 consisting of answering to the server's challenge with the proper
1709 /* How many bytes it will take to store LEN bytes in base64. */
1710 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
1712 /* Encode the string S of length LENGTH to base64 format and place it
1713 to STORE. STORE will be 0-terminated, and must point to a writable
1714 buffer of at least 1+BASE64_LENGTH(length) bytes. */
1716 base64_encode (const char *s, char *store, int length)
1718 /* Conversion table. */
1719 static char tbl[64] = {
1720 'A','B','C','D','E','F','G','H',
1721 'I','J','K','L','M','N','O','P',
1722 'Q','R','S','T','U','V','W','X',
1723 'Y','Z','a','b','c','d','e','f',
1724 'g','h','i','j','k','l','m','n',
1725 'o','p','q','r','s','t','u','v',
1726 'w','x','y','z','0','1','2','3',
1727 '4','5','6','7','8','9','+','/'
1730 unsigned char *p = (unsigned char *)store;
1732 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
1733 for (i = 0; i < length; i += 3)
1735 *p++ = tbl[s[0] >> 2];
1736 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
1737 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
1738 *p++ = tbl[s[2] & 0x3f];
1741 /* Pad the result if necessary... */
1742 if (i == length + 1)
1744 else if (i == length + 2)
1745 *(p - 1) = *(p - 2) = '=';
1746 /* ...and zero-terminate it. */
1750 /* Create the authentication header contents for the `Basic' scheme.
1751 This is done by encoding the string `USER:PASS' in base64 and
1752 prepending `HEADER: Basic ' to it. */
1754 basic_authentication_encode (const char *user, const char *passwd,
1757 char *t1, *t2, *res;
1758 int len1 = strlen (user) + 1 + strlen (passwd);
1759 int len2 = BASE64_LENGTH (len1);
1761 t1 = (char *)alloca (len1 + 1);
1762 sprintf (t1, "%s:%s", user, passwd);
1763 t2 = (char *)alloca (1 + len2);
1764 base64_encode (t1, t2, len1);
1765 res = (char *)malloc (len2 + 11 + strlen (header));
1766 sprintf (res, "%s: Basic %s\r\n", header, t2);
1772 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
1773 of a field in such a header. If the field is the one specified by
1774 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
1775 digest authorization code), extract its value in the (char*)
1776 variable pointed by RET. Returns negative on a malformed header,
1777 or number of bytes that have been parsed by this call. */
1779 extract_header_attr (const char *au, const char *attr_name, char **ret)
1781 const char *cp, *ep;
1785 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
1787 cp += strlen (attr_name);
1790 cp += skip_lws (cp);
1795 cp += skip_lws (cp);
1800 for (ep = cp; *ep && *ep != '\"'; ep++)
1805 *ret = strdupdelim (cp, ep);
1812 /* Response value needs to be in lowercase, so we cannot use HEXD2ASC
1813 from url.h. See RFC 2069 2.1.2 for the syntax of response-digest. */
1814 #define HEXD2asc(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
1816 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
1817 an array of 16 bytes containing the hash keys, and BUF should be a
1818 buffer of 33 writable characters (32 for hex digits plus one for
1819 zero termination). */
1821 dump_hash (unsigned char *buf, const unsigned char *hash)
1825 for (i = 0; i < MD5_HASHLEN; i++, hash++)
1827 *buf++ = HEXD2asc (*hash >> 4);
1828 *buf++ = HEXD2asc (*hash & 0xf);
1833 /* Take the line apart to find the challenge, and compose a digest
1834 authorization header. See RFC2069 section 2.1.2. */
1836 digest_authentication_encode (const char *au, const char *user,
1837 const char *passwd, const char *method,
1840 static char *realm, *opaque, *nonce;
1845 { "realm", &realm },
1846 { "opaque", &opaque },
1851 realm = opaque = nonce = NULL;
1853 au += 6; /* skip over `Digest' */
1858 au += skip_lws (au);
1859 for (i = 0; i < ARRAY_SIZE (options); i++)
1861 int skip = extract_header_attr (au, options[i].name,
1862 options[i].variable);
1866 FREE_MAYBE (opaque);
1876 if (i == ARRAY_SIZE (options))
1878 while (*au && *au != '=')
1882 au += skip_lws (au);
1886 while (*au && *au != '\"')
1893 while (*au && *au != ',')
1898 if (!realm || !nonce || !user || !passwd || !path || !method)
1901 FREE_MAYBE (opaque);
1906 /* Calculate the digest value. */
1909 unsigned char hash[MD5_HASHLEN];
1910 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
1911 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
1913 /* A1BUF = H(user ":" realm ":" password) */
1914 md5_init_ctx (&ctx);
1915 md5_process_bytes (user, strlen (user), &ctx);
1916 md5_process_bytes (":", 1, &ctx);
1917 md5_process_bytes (realm, strlen (realm), &ctx);
1918 md5_process_bytes (":", 1, &ctx);
1919 md5_process_bytes (passwd, strlen (passwd), &ctx);
1920 md5_finish_ctx (&ctx, hash);
1921 dump_hash (a1buf, hash);
1923 /* A2BUF = H(method ":" path) */
1924 md5_init_ctx (&ctx);
1925 md5_process_bytes (method, strlen (method), &ctx);
1926 md5_process_bytes (":", 1, &ctx);
1927 md5_process_bytes (path, strlen (path), &ctx);
1928 md5_finish_ctx (&ctx, hash);
1929 dump_hash (a2buf, hash);
1931 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
1932 md5_init_ctx (&ctx);
1933 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
1934 md5_process_bytes (":", 1, &ctx);
1935 md5_process_bytes (nonce, strlen (nonce), &ctx);
1936 md5_process_bytes (":", 1, &ctx);
1937 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
1938 md5_finish_ctx (&ctx, hash);
1939 dump_hash (response_digest, hash);
1941 res = (char*) xmalloc (strlen (user)
1946 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
1947 + (opaque ? strlen (opaque) : 0)
1949 sprintf (res, "Authorization: Digest \
1950 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
1951 user, realm, nonce, path, response_digest);
1954 char *p = res + strlen (res);
1955 strcat (p, ", opaque=\"");
1959 strcat (res, "\r\n");
1963 #endif /* USE_DIGEST */
1966 #define BEGINS_WITH(line, string_constant) \
1967 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1968 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1969 || !line[sizeof (string_constant) - 1]))
1972 known_authentication_scheme_p (const char *au)
1974 return BEGINS_WITH (au, "Basic")
1975 || BEGINS_WITH (au, "Digest")
1976 || BEGINS_WITH (au, "NTLM");
1981 /* Create the HTTP authorization request header. When the
1982 `WWW-Authenticate' response header is seen, according to the
1983 authorization scheme specified in that header (`Basic' and `Digest'
1984 are supported by the current implementation), produce an
1985 appropriate HTTP authorization request header. */
1987 create_authorization_line (const char *au, const char *user,
1988 const char *passwd, const char *method,
1991 char *wwwauth = NULL;
1993 if (!strncasecmp (au, "Basic", 5))
1994 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
1995 if (!strncasecmp (au, "NTLM", 4))
1996 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
1998 else if (!strncasecmp (au, "Digest", 6))
1999 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2000 #endif /* USE_DIGEST */