2 Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GNU Wget.
7 GNU Wget is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GNU Wget is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Wget; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 In addition, as a special exception, the Free Software Foundation
22 gives permission to link the code of its release of Wget with the
23 OpenSSL project's "OpenSSL" library (or with modified versions of it
24 that use the same license as the "OpenSSL" library), and distribute
25 the linked executables. You must obey the GNU General Public License
26 in all respects for all of the code used other than "OpenSSL". If you
27 modify this file, you may extend this exception to your version of the
28 file, but you are not obligated to do so. If you do not wish to do
29 so, delete this exception statement from your version. */
35 #include <sys/types.h>
46 #if TIME_WITH_SYS_TIME
47 # include <sys/time.h>
51 # include <sys/time.h>
70 # include "gen_sslfunc.h"
78 extern char *version_string;
79 extern LARGE_INT total_downloaded_bytes;
82 static int cookies_loaded_p;
83 struct cookie_jar *wget_cookie_jar;
85 #define TEXTHTML_S "text/html"
86 #define TEXTXHTML_S "application/xhtml+xml"
87 #define HTTP_ACCEPT "*/*"
89 /* Some status code validation macros: */
90 #define H_20X(x) (((x) >= 200) && ((x) < 300))
91 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
92 #define H_REDIRECTED(x) ((x) == HTTP_STATUS_MOVED_PERMANENTLY \
93 || (x) == HTTP_STATUS_MOVED_TEMPORARILY \
94 || (x) == HTTP_STATUS_TEMPORARY_REDIRECT)
96 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
98 #define HTTP_STATUS_OK 200
99 #define HTTP_STATUS_CREATED 201
100 #define HTTP_STATUS_ACCEPTED 202
101 #define HTTP_STATUS_NO_CONTENT 204
102 #define HTTP_STATUS_PARTIAL_CONTENTS 206
104 /* Redirection 3xx. */
105 #define HTTP_STATUS_MULTIPLE_CHOICES 300
106 #define HTTP_STATUS_MOVED_PERMANENTLY 301
107 #define HTTP_STATUS_MOVED_TEMPORARILY 302
108 #define HTTP_STATUS_NOT_MODIFIED 304
109 #define HTTP_STATUS_TEMPORARY_REDIRECT 307
111 /* Client error 4xx. */
112 #define HTTP_STATUS_BAD_REQUEST 400
113 #define HTTP_STATUS_UNAUTHORIZED 401
114 #define HTTP_STATUS_FORBIDDEN 403
115 #define HTTP_STATUS_NOT_FOUND 404
117 /* Server errors 5xx. */
118 #define HTTP_STATUS_INTERNAL 500
119 #define HTTP_STATUS_NOT_IMPLEMENTED 501
120 #define HTTP_STATUS_BAD_GATEWAY 502
121 #define HTTP_STATUS_UNAVAILABLE 503
124 /* Parse the HTTP status line, which is of format:
126 HTTP-Version SP Status-Code SP Reason-Phrase
128 The function returns the status-code, or -1 if the status line is
129 malformed. The pointer to reason-phrase is returned in RP. */
131 parse_http_status_line (const char *line, const char **reason_phrase_ptr)
133 /* (the variables must not be named `major' and `minor', because
134 that breaks compilation with SunOS4 cc.) */
135 int mjr, mnr, statcode;
138 *reason_phrase_ptr = NULL;
140 /* The standard format of HTTP-Version is: `HTTP/X.Y', where X is
141 major version, and Y is minor version. */
142 if (strncmp (line, "HTTP/", 5) != 0)
146 /* Calculate major HTTP version. */
148 for (mjr = 0; ISDIGIT (*line); line++)
149 mjr = 10 * mjr + (*line - '0');
150 if (*line != '.' || p == line)
154 /* Calculate minor HTTP version. */
156 for (mnr = 0; ISDIGIT (*line); line++)
157 mnr = 10 * mnr + (*line - '0');
158 if (*line != ' ' || p == line)
160 /* Wget will accept only 1.0 and higher HTTP-versions. The value of
161 minor version can be safely ignored. */
166 /* Calculate status code. */
167 if (!(ISDIGIT (*line) && ISDIGIT (line[1]) && ISDIGIT (line[2])))
169 statcode = 100 * (*line - '0') + 10 * (line[1] - '0') + (line[2] - '0');
171 /* Set up the reason phrase pointer. */
173 /* RFC2068 requires SPC here, but we allow the string to finish
174 here, in case no reason-phrase is present. */
178 *reason_phrase_ptr = line;
183 *reason_phrase_ptr = line + 1;
188 #define WMIN(x, y) ((x) > (y) ? (y) : (x))
190 /* Send the contents of FILE_NAME to SOCK/SSL. Make sure that exactly
191 PROMISED_SIZE bytes are sent over the wire -- if the file is
192 longer, read only that much; if the file is shorter, report an error. */
195 post_file (int sock, void *ssl, const char *file_name, long promised_size)
197 static char chunk[8192];
202 /* Only one of SOCK and SSL may be active at the same time. */
203 assert (sock > -1 || ssl != NULL);
204 assert (sock == -1 || ssl == NULL);
206 DEBUGP (("[writing POST file %s ... ", file_name));
208 fp = fopen (file_name, "rb");
211 while (!feof (fp) && written < promised_size)
214 int length = fread (chunk, 1, sizeof (chunk), fp);
217 towrite = WMIN (promised_size - written, length);
220 write_error = ssl_iwrite (ssl, chunk, towrite);
223 write_error = iwrite (sock, chunk, towrite);
233 /* If we've written less than was promised, report a (probably
234 nonsensical) error rather than break the promise. */
235 if (written < promised_size)
241 assert (written == promised_size);
242 DEBUGP (("done]\n"));
246 /* Functions to be used as arguments to header_process(): */
248 struct http_process_range_closure {
254 /* Parse the `Content-Range' header and extract the information it
255 contains. Returns 1 if successful, -1 otherwise. */
257 http_process_range (const char *hdr, void *arg)
259 struct http_process_range_closure *closure
260 = (struct http_process_range_closure *)arg;
263 /* Certain versions of Nutscape proxy server send out
264 `Content-Length' without "bytes" specifier, which is a breach of
265 RFC2068 (as well as the HTTP/1.1 draft which was current at the
266 time). But hell, I must support it... */
267 if (!strncasecmp (hdr, "bytes", 5))
270 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
274 hdr += skip_lws (hdr);
280 for (num = 0; ISDIGIT (*hdr); hdr++)
281 num = 10 * num + (*hdr - '0');
282 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
284 closure->first_byte_pos = num;
286 for (num = 0; ISDIGIT (*hdr); hdr++)
287 num = 10 * num + (*hdr - '0');
288 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
290 closure->last_byte_pos = num;
292 for (num = 0; ISDIGIT (*hdr); hdr++)
293 num = 10 * num + (*hdr - '0');
294 closure->entity_length = num;
298 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
299 Used for `Accept-Ranges'. */
301 http_process_none (const char *hdr, void *arg)
303 int *where = (int *)arg;
305 if (strstr (hdr, "none"))
312 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
314 http_process_type (const char *hdr, void *arg)
316 char **result = (char **)arg;
317 /* Locate P on `;' or the terminating zero, whichever comes first. */
318 const char *p = strchr (hdr, ';');
320 p = hdr + strlen (hdr);
321 while (p > hdr && ISSPACE (*(p - 1)))
323 *result = strdupdelim (hdr, p);
327 /* Check whether the `Connection' header is set to "keep-alive". */
329 http_process_connection (const char *hdr, void *arg)
331 int *flag = (int *)arg;
332 if (!strcasecmp (hdr, "Keep-Alive"))
337 /* Commit the cookie to the cookie jar. */
340 http_process_set_cookie (const char *hdr, void *arg)
342 struct url *u = (struct url *)arg;
344 /* The jar should have been created by now. */
345 assert (wget_cookie_jar != NULL);
347 cookie_jar_process_set_cookie (wget_cookie_jar, u->host, u->port, u->path,
353 /* Persistent connections. Currently, we cache the most recently used
354 connection as persistent, provided that the HTTP server agrees to
355 make it such. The persistence data is stored in the variables
356 below. Ideally, it would be in a structure, and it should be
357 possible to cache an arbitrary fixed number of these connections.
359 I think the code is quite easy to extend in that direction. */
361 /* Whether a persistent connection is active. */
362 static int pc_active_p;
363 /* Host and port of currently active persistent connection. */
364 static struct address_list *pc_last_host_ip;
365 static unsigned short pc_last_port;
367 /* File descriptor of the currently active persistent connection. */
368 static int pc_last_fd;
371 /* Whether a ssl handshake has occoured on this connection */
372 static int pc_active_ssl;
373 /* SSL connection of the currently active persistent connection. */
374 static SSL *pc_last_ssl;
375 #endif /* HAVE_SSL */
377 /* Mark the persistent connection as invalid. This is used by the
378 CLOSE_* macros after they forcefully close a registered persistent
379 connection. This does not close the file descriptor -- it is left
380 to the caller to do that. (Maybe it should, though.) */
383 invalidate_persistent (void)
388 #endif /* HAVE_SSL */
389 if (pc_last_host_ip != NULL)
391 address_list_release (pc_last_host_ip);
392 pc_last_host_ip = NULL;
394 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
397 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
398 persistent. This will enable someone to use the same connection
399 later. In the context of HTTP, this must be called only AFTER the
400 response has been received and the server has promised that the
401 connection will remain alive.
403 If a previous connection was persistent, it is closed. */
407 register_persistent (const char *host, unsigned short port, int fd, SSL *ssl)
411 register_persistent (const char *host, unsigned short port, int fd)
416 if (pc_last_fd == fd)
418 /* The connection FD is already registered. Nothing to
424 /* The old persistent connection is still active; let's
425 close it first. This situation arises whenever a
426 persistent connection exists, but we then connect to a
427 different host, and try to register a persistent
428 connection to that one. */
430 /* The ssl disconnect has to take place before the closing
433 shutdown_ssl(pc_last_ssl);
436 invalidate_persistent ();
440 assert (pc_last_host_ip == NULL);
442 /* This lookup_host cannot fail, because it has the results in the
444 pc_last_host_ip = lookup_host (host, LH_SILENT);
445 assert (pc_last_host_ip != NULL);
452 pc_active_ssl = ssl ? 1 : 0;
454 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
458 # define SHUTDOWN_SSL(ssl) do { \
460 shutdown_ssl (ssl); \
463 # define SHUTDOWN_SSL(ssl)
466 /* Return non-zero if a persistent connection is available for
467 connecting to HOST:PORT. */
471 persistent_available_p (const char *host, unsigned short port, int ssl)
475 persistent_available_p (const char *host, unsigned short port)
479 struct address_list *this_host_ip;
481 /* First, check whether a persistent connection is active at all. */
484 /* Second, check if the active connection pertains to the correct
485 (HOST, PORT) ordered pair. */
486 if (port != pc_last_port)
490 /* Second, a): check if current connection is (not) ssl, too. This
491 test is unlikely to fail because HTTP and HTTPS typicaly use
492 different ports. Yet it is possible, or so I [Christian
493 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
495 if (ssl != pc_active_ssl)
497 #endif /* HAVE_SSL */
499 this_host_ip = lookup_host (host, LH_SILENT);
503 /* To equate the two host names for the purposes of persistent
504 connections, they need to share all the IP addresses in the
506 success = address_list_match_all (pc_last_host_ip, this_host_ip);
507 address_list_release (this_host_ip);
511 /* Third: check whether the connection is still open. This is
512 important because most server implement a liberal (short) timeout
513 on persistent connections. Wget can of course always reconnect
514 if the connection doesn't work out, but it's nicer to know in
515 advance. This test is a logical followup of the first test, but
516 is "expensive" and therefore placed at the end of the list. */
517 if (!test_socket_open (pc_last_fd))
519 /* Oops, the socket is no longer open. Now that we know that,
520 let's invalidate the persistent connection before returning
524 SHUTDOWN_SSL (pc_last_ssl);
527 invalidate_persistent ();
533 /* The idea behind these two CLOSE macros is to distinguish between
534 two cases: one when the job we've been doing is finished, and we
535 want to close the connection and leave, and two when something is
536 seriously wrong and we're closing the connection as part of
539 In case of keep_alive, CLOSE_FINISH should leave the connection
540 open, while CLOSE_INVALIDATE should still close it.
542 Note that the semantics of the flag `keep_alive' is "this
543 connection *will* be reused (the server has promised not to close
544 the connection once we're done)", while the semantics of
545 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
546 active, registered connection". */
548 #define CLOSE_FINISH(fd) do { \
551 SHUTDOWN_SSL (ssl); \
553 if (pc_active_p && (fd) == pc_last_fd) \
554 invalidate_persistent (); \
558 #define CLOSE_INVALIDATE(fd) do { \
559 SHUTDOWN_SSL (ssl); \
561 if (pc_active_p && (fd) == pc_last_fd) \
562 invalidate_persistent (); \
567 long len; /* received length */
568 long contlen; /* expected length */
569 long restval; /* the restart value */
570 int res; /* the result of last read */
571 char *newloc; /* new location (redirection) */
572 char *remote_time; /* remote time-stamp string */
573 char *error; /* textual HTTP error */
574 int statcode; /* status code */
575 double dltime; /* time of the download in msecs */
576 int no_truncate; /* whether truncating the file is
578 const char *referer; /* value of the referer header. */
579 char **local_file; /* local file. */
583 free_hstat (struct http_stat *hs)
585 FREE_MAYBE (hs->newloc);
586 FREE_MAYBE (hs->remote_time);
587 FREE_MAYBE (hs->error);
589 /* Guard against being called twice. */
591 hs->remote_time = NULL;
595 static char *create_authorization_line PARAMS ((const char *, const char *,
596 const char *, const char *,
598 static char *basic_authentication_encode PARAMS ((const char *, const char *,
600 static int known_authentication_scheme_p PARAMS ((const char *));
602 time_t http_atotm PARAMS ((const char *));
604 #define BEGINS_WITH(line, string_constant) \
605 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
606 && (ISSPACE (line[sizeof (string_constant) - 1]) \
607 || !line[sizeof (string_constant) - 1]))
609 /* Retrieve a document through HTTP protocol. It recognizes status
610 code, and correctly handles redirections. It closes the network
611 socket. If it receives an error from the functions below it, it
612 will print it if there is enough information to do so (almost
613 always), returning the error to the caller (i.e. http_loop).
615 Various HTTP parameters are stored to hs. Although it parses the
616 response code correctly, it is not used in a sane way. The caller
619 If PROXY is non-NULL, the connection will be made to the proxy
620 server, and u->url will be requested. */
622 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
624 char *request, *type, *command, *full_path;
626 char *pragma_h, *referer, *useragent, *range, *wwwauth;
627 char *authenticate_h;
631 char *request_keep_alive;
632 int sock, hcount, all_length, statcode;
634 long contlen, contrange;
637 int auth_tried_already;
640 static SSL_CTX *ssl_ctx = NULL;
643 char *cookies = NULL;
645 /* Whether this connection will be kept alive after the HTTP request
649 /* Flags that detect the two ways of specifying HTTP keep-alive
651 int http_keep_alive_1, http_keep_alive_2;
653 /* Whether keep-alive should be inhibited. */
654 int inhibit_keep_alive;
656 /* Whether we need to print the host header with braces around host,
657 e.g. "Host: [3ffe:8100:200:2::2]:1234" instead of the usual
658 "Host: symbolic-name:1234". */
659 int squares_around_host = 0;
661 /* Headers sent when using POST. */
662 char *post_content_type, *post_content_length;
663 long post_data_size = 0;
666 /* initialize ssl_ctx on first run */
669 uerr_t err = init_ssl (&ssl_ctx);
674 case SSLERRCTXCREATE:
676 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
680 /* try without certfile */
681 logprintf (LOG_NOTQUIET,
682 _("Failed to load certificates from %s\n"),
685 logprintf (LOG_NOTQUIET,
686 _("Trying without the specified certificate\n"));
689 logprintf (LOG_NOTQUIET,
690 _("Failed to get certificate key from %s\n"),
693 logprintf (LOG_NOTQUIET,
694 _("Trying without the specified certificate\n"));
701 #endif /* HAVE_SSL */
703 if (!(*dt & HEAD_ONLY))
704 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
705 know the local filename so we can save to it. */
706 assert (*hs->local_file != NULL);
709 auth_tried_already = 0;
711 inhibit_keep_alive = !opt.http_keep_alive || proxy != NULL;
714 /* We need to come back here when the initial attempt to retrieve
715 without authorization header fails. (Expected to happen at least
716 for the Digest authorization scheme.) */
719 http_keep_alive_1 = http_keep_alive_2 = 0;
721 post_content_type = NULL;
722 post_content_length = NULL;
724 /* Initialize certain elements of struct http_stat. */
729 hs->remote_time = NULL;
732 /* If we're using a proxy, we will be connecting to the proxy
734 conn = proxy ? proxy : u;
736 /* First: establish the connection. */
737 if (inhibit_keep_alive
740 !persistent_available_p (conn->host, conn->port)
742 !persistent_available_p (conn->host, conn->port,
743 u->scheme == SCHEME_HTTPS)
744 #endif /* HAVE_SSL */
747 struct address_list *al = lookup_host (conn->host, 0);
750 set_connection_host_name (conn->host);
751 sock = connect_to_many (al, conn->port, 0);
752 set_connection_host_name (NULL);
753 address_list_release (al);
756 return CONNECT_ERROR (errno);
759 if (conn->scheme == SCHEME_HTTPS)
760 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
762 logputs (LOG_VERBOSE, "\n");
763 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
768 #endif /* HAVE_SSL */
772 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"),
773 conn->host, conn->port);
774 /* #### pc_last_fd should be accessed through an accessor
779 #endif /* HAVE_SSL */
780 DEBUGP (("Reusing fd %d.\n", sock));
785 else if (opt.post_file_name || opt.post_data)
793 referer = (char *)alloca (9 + strlen (hs->referer) + 3);
794 sprintf (referer, "Referer: %s\r\n", hs->referer);
797 if (*dt & SEND_NOCACHE)
798 pragma_h = "Pragma: no-cache\r\n";
804 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
805 /* Gag me! Some servers (e.g. WebSitePro) have been known to
806 respond to the following `Range' format by generating a
807 multipart/x-byte-ranges MIME document! This MIME type was
808 present in an old draft of the byteranges specification.
809 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
810 only if multiple non-overlapping ranges are requested --
811 which Wget never does. */
812 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
817 STRDUP_ALLOCA (useragent, opt.useragent);
820 useragent = (char *)alloca (10 + strlen (version_string));
821 sprintf (useragent, "Wget/%s", version_string);
823 /* Construct the authentication, if userid is present. */
826 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
827 user = user ? user : opt.http_user;
828 passwd = passwd ? passwd : opt.http_passwd;
835 /* We have the username and the password, but haven't tried
836 any authorization yet. Let's see if the "Basic" method
837 works. If not, we'll come back here and construct a
838 proper authorization method with the right challenges.
840 If we didn't employ this kind of logic, every URL that
841 requires authorization would have to be processed twice,
842 which is very suboptimal and generates a bunch of false
843 "unauthorized" errors in the server log.
845 #### But this logic also has a serious problem when used
846 with stronger authentications: we *first* transmit the
847 username and the password in clear text, and *then*
848 attempt a stronger authentication scheme. That cannot be
849 right! We are only fortunate that almost everyone still
850 uses the `Basic' scheme anyway.
852 There should be an option to prevent this from happening,
853 for those who use strong authentication schemes and value
855 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
859 /* Use the full path, i.e. one that includes the leading
860 slash and the query string, but is independent of proxy
862 char *pth = url_full_path (u);
863 wwwauth = create_authorization_line (authenticate_h, user, passwd,
872 char *proxy_user, *proxy_passwd;
873 /* For normal username and password, URL components override
874 command-line/wgetrc parameters. With proxy authentication,
875 it's the reverse, because proxy URLs are normally the
876 "permanent" ones, so command-line args should take
878 if (opt.proxy_user && opt.proxy_passwd)
880 proxy_user = opt.proxy_user;
881 proxy_passwd = opt.proxy_passwd;
885 proxy_user = proxy->user;
886 proxy_passwd = proxy->passwd;
888 /* #### This does not appear right. Can't the proxy request,
889 say, `Digest' authentication? */
890 if (proxy_user && proxy_passwd)
891 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
892 "Proxy-Authorization");
895 /* String of the form :PORT. Used only for non-standard ports. */
897 if (u->port != scheme_default_port (u->scheme))
899 port_maybe = (char *)alloca (numdigit (u->port) + 2);
900 sprintf (port_maybe, ":%d", u->port);
903 if (!inhibit_keep_alive)
904 request_keep_alive = "Connection: Keep-Alive\r\n";
906 request_keep_alive = NULL;
909 cookies = cookie_jar_generate_cookie_header (wget_cookie_jar, u->host,
912 u->scheme == SCHEME_HTTPS
918 if (opt.post_data || opt.post_file_name)
920 post_content_type = "Content-Type: application/x-www-form-urlencoded\r\n";
922 post_data_size = strlen (opt.post_data);
925 post_data_size = file_size (opt.post_file_name);
926 if (post_data_size == -1)
928 logprintf (LOG_NOTQUIET, "POST data file missing: %s\n",
933 post_content_length = xmalloc (16 + numdigit (post_data_size) + 2 + 1);
934 sprintf (post_content_length,
935 "Content-Length: %ld\r\n", post_data_size);
939 full_path = xstrdup (u->url);
941 /* Use the full path, i.e. one that includes the leading slash and
942 the query string. E.g. if u->path is "foo/bar" and u->query is
943 "param=value", full_path will be "/foo/bar?param=value". */
944 full_path = url_full_path (u);
946 if (strchr (u->host, ':'))
947 squares_around_host = 1;
949 /* Allocate the memory for the request. */
950 request = (char *)alloca (strlen (command)
954 + (port_maybe ? strlen (port_maybe) : 0)
955 + strlen (HTTP_ACCEPT)
956 + (request_keep_alive
957 ? strlen (request_keep_alive) : 0)
958 + (referer ? strlen (referer) : 0)
959 + (cookies ? strlen (cookies) : 0)
960 + (wwwauth ? strlen (wwwauth) : 0)
961 + (proxyauth ? strlen (proxyauth) : 0)
962 + (range ? strlen (range) : 0)
965 ? strlen (post_content_type) : 0)
966 + (post_content_length
967 ? strlen (post_content_length) : 0)
968 + (opt.user_header ? strlen (opt.user_header) : 0)
970 /* Construct the request. */
976 %s%s%s%s%s%s%s%s%s%s\r\n",
979 squares_around_host ? "[" : "", u->host, squares_around_host ? "]" : "",
980 port_maybe ? port_maybe : "",
982 request_keep_alive ? request_keep_alive : "",
983 referer ? referer : "",
984 cookies ? cookies : "",
985 wwwauth ? wwwauth : "",
986 proxyauth ? proxyauth : "",
989 post_content_type ? post_content_type : "",
990 post_content_length ? post_content_length : "",
991 opt.user_header ? opt.user_header : "");
992 DEBUGP (("---request begin---\n%s", request));
994 /* Free the temporary memory. */
995 FREE_MAYBE (wwwauth);
996 FREE_MAYBE (proxyauth);
997 FREE_MAYBE (cookies);
1000 /* Send the request to server. */
1002 if (conn->scheme == SCHEME_HTTPS)
1003 write_error = ssl_iwrite (ssl, request, strlen (request));
1006 write_error = iwrite (sock, request, strlen (request));
1008 if (write_error >= 0)
1012 DEBUGP (("[POST data: %s]\n", opt.post_data));
1014 if (conn->scheme == SCHEME_HTTPS)
1015 write_error = ssl_iwrite (ssl, opt.post_data, post_data_size);
1018 write_error = iwrite (sock, opt.post_data, post_data_size);
1020 else if (opt.post_file_name && post_data_size != 0)
1023 if (conn->scheme == SCHEME_HTTPS)
1024 write_error = post_file (-1, ssl, opt.post_file_name,
1028 write_error = post_file (sock, NULL, opt.post_file_name,
1032 DEBUGP (("---request end---\n"));
1034 if (write_error < 0)
1036 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
1038 CLOSE_INVALIDATE (sock);
1041 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1042 proxy ? "Proxy" : "HTTP");
1043 contlen = contrange = -1;
1048 /* Before reading anything, initialize the rbuf. */
1049 rbuf_initialize (&rbuf, sock);
1051 if (conn->scheme == SCHEME_HTTPS)
1055 #endif /* HAVE_SSL */
1058 /* Header-fetching loop. */
1066 /* Get the header. */
1067 status = header_get (&rbuf, &hdr,
1068 /* Disallow continuations for status line. */
1069 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
1071 /* Check for errors. */
1072 if (status == HG_EOF && *hdr)
1074 /* This used to be an unconditional error, but that was
1075 somewhat controversial, because of a large number of
1076 broken CGI's that happily "forget" to send the second EOL
1077 before closing the connection of a HEAD request.
1079 So, the deal is to check whether the header is empty
1080 (*hdr is zero if it is); if yes, it means that the
1081 previous header was fully retrieved, and that -- most
1082 probably -- the request is complete. "...be liberal in
1083 what you accept." Oh boy. */
1084 logputs (LOG_VERBOSE, "\n");
1085 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
1088 FREE_MAYBE (all_headers);
1089 CLOSE_INVALIDATE (sock);
1092 else if (status == HG_ERROR)
1094 logputs (LOG_VERBOSE, "\n");
1095 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1099 FREE_MAYBE (all_headers);
1100 CLOSE_INVALIDATE (sock);
1104 /* If the headers are to be saved to a file later, save them to
1106 if (opt.save_headers)
1108 int lh = strlen (hdr);
1109 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
1110 memcpy (all_headers + all_length, hdr, lh);
1112 all_headers[all_length++] = '\n';
1113 all_headers[all_length] = '\0';
1116 /* Check for status line. */
1120 /* Parse the first line of server response. */
1121 statcode = parse_http_status_line (hdr, &error);
1122 hs->statcode = statcode;
1123 /* Store the descriptive response. */
1124 if (statcode == -1) /* malformed response */
1126 /* A common reason for "malformed response" error is the
1127 case when no data was actually received. Handle this
1130 hs->error = xstrdup (_("No data received"));
1132 hs->error = xstrdup (_("Malformed status line"));
1137 hs->error = xstrdup (_("(no description)"));
1139 hs->error = xstrdup (error);
1141 if ((statcode != -1)
1147 if (opt.server_response)
1148 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
1150 logprintf (LOG_VERBOSE, "%2d %s", statcode, error);
1156 /* Exit on empty header. */
1163 /* Print the header if requested. */
1164 if (opt.server_response && hcount != 1)
1165 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
1167 /* Try getting content-length. */
1168 if (contlen == -1 && !opt.ignore_length)
1169 if (header_process (hdr, "Content-Length", header_extract_number,
1172 /* Try getting content-type. */
1174 if (header_process (hdr, "Content-Type", http_process_type, &type))
1176 /* Try getting location. */
1178 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1180 /* Try getting last-modified. */
1181 if (!hs->remote_time)
1182 if (header_process (hdr, "Last-Modified", header_strdup,
1185 /* Try getting cookies. */
1187 if (header_process (hdr, "Set-Cookie", http_process_set_cookie, u))
1189 /* Try getting www-authentication. */
1190 if (!authenticate_h)
1191 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1194 /* Check for accept-ranges header. If it contains the word
1195 `none', disable the ranges. */
1196 if (*dt & ACCEPTRANGES)
1199 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1202 *dt &= ~ACCEPTRANGES;
1206 /* Try getting content-range. */
1207 if (contrange == -1)
1209 struct http_process_range_closure closure;
1210 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1212 contrange = closure.first_byte_pos;
1216 /* Check for keep-alive related responses. */
1217 if (!inhibit_keep_alive)
1219 /* Check for the `Keep-Alive' header. */
1220 if (!http_keep_alive_1)
1222 if (header_process (hdr, "Keep-Alive", header_exists,
1223 &http_keep_alive_1))
1226 /* Check for `Connection: Keep-Alive'. */
1227 if (!http_keep_alive_2)
1229 if (header_process (hdr, "Connection", http_process_connection,
1230 &http_keep_alive_2))
1238 logputs (LOG_VERBOSE, "\n");
1241 && (http_keep_alive_1 || http_keep_alive_2))
1243 assert (inhibit_keep_alive == 0);
1247 /* The server has promised that it will not close the connection
1248 when we're done. This means that we can register it. */
1250 register_persistent (conn->host, conn->port, sock);
1252 register_persistent (conn->host, conn->port, sock, ssl);
1253 #endif /* HAVE_SSL */
1255 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1258 /* Authorization is required. */
1262 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1263 might be more bytes in the body. */
1264 if (auth_tried_already)
1266 /* If we have tried it already, then there is not point
1269 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1270 xfree (authenticate_h);
1273 else if (!known_authentication_scheme_p (authenticate_h))
1275 xfree (authenticate_h);
1276 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1279 else if (BEGINS_WITH (authenticate_h, "Basic"))
1281 /* The authentication scheme is basic, the one we try by
1282 default, and it failed. There's no sense in trying
1288 auth_tried_already = 1;
1292 /* We do not need this anymore. */
1295 xfree (authenticate_h);
1296 authenticate_h = NULL;
1299 /* 20x responses are counted among successful by default. */
1300 if (H_20X (statcode))
1303 /* Return if redirected. */
1304 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1306 /* RFC2068 says that in case of the 300 (multiple choices)
1307 response, the server can output a preferred URL through
1308 `Location' header; otherwise, the request should be treated
1309 like GET. So, if the location is set, it will be a
1310 redirection; otherwise, just proceed normally. */
1311 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1315 logprintf (LOG_VERBOSE,
1316 _("Location: %s%s\n"),
1317 hs->newloc ? hs->newloc : _("unspecified"),
1318 hs->newloc ? _(" [following]") : "");
1319 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1320 might be more bytes in the body. */
1322 FREE_MAYBE (all_headers);
1327 /* If content-type is not given, assume text/html. This is because
1328 of the multitude of broken CGI's that "forget" to generate the
1331 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) ||
1332 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S)))
1337 if (opt.html_extension && (*dt & TEXTHTML))
1338 /* -E / --html-extension / html_extension = on was specified, and this is a
1339 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1340 already the file's suffix, tack on ".html". */
1342 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1344 if (last_period_in_local_filename == NULL ||
1345 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
1346 strcasecmp(last_period_in_local_filename, ".html") == EQ))
1348 size_t local_filename_len = strlen(*hs->local_file);
1350 *hs->local_file = xrealloc(*hs->local_file,
1351 local_filename_len + sizeof(".html"));
1352 strcpy(*hs->local_file + local_filename_len, ".html");
1354 *dt |= ADDED_HTML_EXTENSION;
1358 if (contrange == -1)
1360 /* We did not get a content-range header. This means that the
1361 server did not honor our `Range' request. Normally, this
1362 means we should reset hs->restval and continue normally. */
1364 /* However, if `-c' is used, we need to be a bit more careful:
1366 1. If `-c' is specified and the file already existed when
1367 Wget was started, it would be a bad idea for us to start
1368 downloading it from scratch, effectively truncating it. I
1369 believe this cannot happen unless `-c' was specified.
1371 2. If `-c' is used on a file that is already fully
1372 downloaded, we're requesting bytes after the end of file,
1373 which can result in server not honoring `Range'. If this is
1374 the case, `Content-Length' will be equal to the length of the
1376 if (opt.always_rest)
1378 /* Check for condition #2. */
1379 if (hs->restval > 0 /* restart was requested. */
1380 && contlen != -1 /* we got content-length. */
1381 && hs->restval >= contlen /* file fully downloaded
1385 logputs (LOG_VERBOSE, _("\
1386 \n The file is already fully retrieved; nothing to do.\n\n"));
1387 /* In case the caller inspects. */
1390 /* Mark as successfully retrieved. */
1393 FREE_MAYBE (all_headers);
1394 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1395 might be more bytes in the body. */
1396 return RETRUNNEEDED;
1399 /* Check for condition #1. */
1400 if (hs->no_truncate)
1402 logprintf (LOG_NOTQUIET,
1405 Continued download failed on this file, which conflicts with `-c'.\n\
1406 Refusing to truncate existing file `%s'.\n\n"), *hs->local_file);
1408 FREE_MAYBE (all_headers);
1409 CLOSE_INVALIDATE (sock);
1410 return CONTNOTSUPPORTED;
1418 else if (contrange != hs->restval ||
1419 (H_PARTIAL (statcode) && contrange == -1))
1421 /* This means the whole request was somehow misunderstood by the
1422 server. Bail out. */
1424 FREE_MAYBE (all_headers);
1425 CLOSE_INVALIDATE (sock);
1432 contlen += contrange;
1434 contrange = -1; /* If conent-length was not sent,
1435 content-range will be ignored. */
1437 hs->contlen = contlen;
1441 if ((*dt & RETROKF) && !opt.server_response)
1443 /* No need to print this output if the body won't be
1444 downloaded at all, or if the original server response is
1446 logputs (LOG_VERBOSE, _("Length: "));
1449 logputs (LOG_VERBOSE, legible (contlen));
1450 if (contrange != -1)
1451 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1452 legible (contlen - contrange));
1455 logputs (LOG_VERBOSE,
1456 opt.ignore_length ? _("ignored") : _("unspecified"));
1458 logprintf (LOG_VERBOSE, " [%s]\n", type);
1460 logputs (LOG_VERBOSE, "\n");
1464 type = NULL; /* We don't need it any more. */
1466 /* Return if we have no intention of further downloading. */
1467 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1469 /* In case the caller cares to look... */
1473 FREE_MAYBE (all_headers);
1474 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1475 might be more bytes in the body. */
1476 return RETRFINISHED;
1479 /* Open the local file. */
1482 mkalldirs (*hs->local_file);
1484 rotate_backups (*hs->local_file);
1485 fp = fopen (*hs->local_file, hs->restval ? "ab" : "wb");
1488 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1489 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1490 might be more bytes in the body. */
1491 FREE_MAYBE (all_headers);
1497 extern int global_download_count;
1499 /* To ensure that repeated "from scratch" downloads work for -O
1500 files, we rewind the file pointer, unless restval is
1501 non-zero. (This works only when -O is used on regular files,
1502 but it's still a valuable feature.)
1504 However, this loses when more than one URL is specified on
1505 the command line the second rewinds eradicates the contents
1506 of the first download. Thus we disable the above trick for
1507 all the downloads except the very first one.
1509 #### A possible solution to this would be to remember the
1510 file position in the output document and to seek to that
1511 position, instead of rewinding.
1513 We don't truncate stdout, since that breaks
1514 "wget -O - [...] >> foo".
1516 if (!hs->restval && global_download_count == 0 && opt.dfp != stdout)
1518 /* This will silently fail for streams that don't correspond
1519 to regular files, but that's OK. */
1521 /* ftruncate is needed because opt.dfp is opened in append
1522 mode if opt.always_rest is set. */
1523 ftruncate (fileno (fp), 0);
1528 /* #### This confuses the code that checks for file size. There
1529 should be some overhead information. */
1530 if (opt.save_headers)
1531 fwrite (all_headers, 1, all_length, fp);
1533 /* Get the contents of the document. */
1534 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1535 (contlen != -1 ? contlen : 0),
1536 &rbuf, keep_alive, &hs->dltime);
1539 CLOSE_FINISH (sock);
1541 CLOSE_INVALIDATE (sock);
1544 /* Close or flush the file. We have to be careful to check for
1545 error here. Checking the result of fwrite() is not enough --
1546 errors could go unnoticed! */
1549 flush_res = fclose (fp);
1551 flush_res = fflush (fp);
1552 if (flush_res == EOF)
1555 FREE_MAYBE (all_headers);
1558 return RETRFINISHED;
1561 /* The genuine HTTP loop! This is the part where the retrieval is
1562 retried, and retried, and retried, and... */
1564 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1565 int *dt, struct url *proxy)
1568 int use_ts, got_head = 0; /* time-stamping info */
1569 char *filename_plus_orig_suffix;
1570 char *local_filename = NULL;
1571 char *tms, *locf, *tmrate;
1573 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1574 long local_size = 0; /* the size of the local file */
1575 size_t filename_len;
1576 struct http_stat hstat; /* HTTP status */
1580 /* This used to be done in main(), but it's a better idea to do it
1581 here so that we don't go through the hoops if we're just using
1585 if (!wget_cookie_jar)
1586 wget_cookie_jar = cookie_jar_new ();
1587 if (opt.cookies_input && !cookies_loaded_p)
1589 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
1590 cookies_loaded_p = 1;
1596 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1597 has_wildcards_p because it would also warn on `?', and we know that
1598 shows up in CGI paths a *lot*. */
1599 if (strchr (u->url, '*'))
1600 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1602 /* Determine the local filename. */
1603 if (local_file && *local_file)
1604 hstat.local_file = local_file;
1605 else if (local_file)
1607 *local_file = url_file_name (u);
1608 hstat.local_file = local_file;
1612 dummy = url_file_name (u);
1613 hstat.local_file = &dummy;
1616 if (!opt.output_document)
1617 locf = *hstat.local_file;
1619 locf = opt.output_document;
1621 hstat.referer = referer;
1623 filename_len = strlen (*hstat.local_file);
1624 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1626 if (opt.noclobber && file_exists_p (*hstat.local_file))
1628 /* If opt.noclobber is turned on and file already exists, do not
1629 retrieve the file */
1630 logprintf (LOG_VERBOSE, _("\
1631 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
1632 /* If the file is there, we suppose it's retrieved OK. */
1635 /* #### Bogusness alert. */
1636 /* If its suffix is "html" or "htm" or similar, assume text/html. */
1637 if (has_html_suffix_p (*hstat.local_file))
1645 if (opt.timestamping)
1647 boolean local_dot_orig_file_exists = FALSE;
1649 if (opt.backup_converted)
1650 /* If -K is specified, we'll act on the assumption that it was specified
1651 last time these files were downloaded as well, and instead of just
1652 comparing local file X against server file X, we'll compare local
1653 file X.orig (if extant, else X) against server file X. If -K
1654 _wasn't_ specified last time, or the server contains files called
1655 *.orig, -N will be back to not operating correctly with -k. */
1657 /* Would a single s[n]printf() call be faster? --dan
1659 Definitely not. sprintf() is horribly slow. It's a
1660 different question whether the difference between the two
1661 affects a program. Usually I'd say "no", but at one
1662 point I profiled Wget, and found that a measurable and
1663 non-negligible amount of time was lost calling sprintf()
1664 in url.c. Replacing sprintf with inline calls to
1665 strcpy() and long_to_string() made a difference.
1667 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
1668 memcpy (filename_plus_orig_suffix + filename_len,
1669 ".orig", sizeof (".orig"));
1671 /* Try to stat() the .orig file. */
1672 if (stat (filename_plus_orig_suffix, &st) == 0)
1674 local_dot_orig_file_exists = TRUE;
1675 local_filename = filename_plus_orig_suffix;
1679 if (!local_dot_orig_file_exists)
1680 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1681 if (stat (*hstat.local_file, &st) == 0)
1682 local_filename = *hstat.local_file;
1684 if (local_filename != NULL)
1685 /* There was a local file, so we'll check later to see if the version
1686 the server has is the same version we already have, allowing us to
1692 /* Modification time granularity is 2 seconds for Windows, so
1693 increase local time by 1 second for later comparison. */
1696 local_size = st.st_size;
1700 /* Reset the counter. */
1702 *dt = 0 | ACCEPTRANGES;
1706 /* Increment the pass counter. */
1708 sleep_between_retrievals (count);
1709 /* Get the current time string. */
1710 tms = time_str (NULL);
1711 /* Print fetch message, if opt.verbose. */
1714 char *hurl = url_string (u, 1);
1718 sprintf (tmp, _("(try:%2d)"), count);
1719 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1720 tms, hurl, tmp, locf);
1722 ws_changetitle (hurl, 1);
1727 /* Default document type is empty. However, if spider mode is
1728 on or time-stamping is employed, HEAD_ONLY commands is
1729 encoded within *dt. */
1730 if (opt.spider || (use_ts && !got_head))
1734 /* Assume no restarting. */
1736 /* Decide whether or not to restart. */
1737 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1738 /* #### this calls access() and then stat(); could be optimized. */
1739 && file_exists_p (locf))
1740 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1741 hstat.restval = st.st_size;
1743 /* In `-c' is used and the file is existing and non-empty,
1744 refuse to truncate it if the server doesn't support continued
1746 hstat.no_truncate = 0;
1747 if (opt.always_rest && hstat.restval)
1748 hstat.no_truncate = 1;
1750 /* Decide whether to send the no-cache directive. We send it in
1752 a) we're using a proxy, and we're past our first retrieval.
1753 Some proxies are notorious for caching incomplete data, so
1754 we require a fresh get.
1755 b) caching is explicitly inhibited. */
1756 if ((proxy && count > 1) /* a */
1757 || !opt.allow_cache /* b */
1759 *dt |= SEND_NOCACHE;
1761 *dt &= ~SEND_NOCACHE;
1763 /* Try fetching the document, or at least its head. */
1764 err = gethttp (u, &hstat, dt, proxy);
1766 /* It's unfortunate that wget determines the local filename before finding
1767 out the Content-Type of the file. Barring a major restructuring of the
1768 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1769 *hstat.local_file to tack on ".html". */
1770 if (!opt.output_document)
1771 locf = *hstat.local_file;
1773 locf = opt.output_document;
1776 tms = time_str (NULL);
1777 /* Get the new location (with or without the redirection). */
1779 *newloc = xstrdup (hstat.newloc);
1782 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1783 case CONERROR: case READERR: case WRITEFAILED:
1785 /* Non-fatal errors continue executing the loop, which will
1786 bring them to "while" statement at the end, to judge
1787 whether the number of tries was exceeded. */
1788 free_hstat (&hstat);
1789 printwhat (count, opt.ntry);
1792 case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED:
1793 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1794 /* Fatal errors just return from the function. */
1795 free_hstat (&hstat);
1799 case FWRITEERR: case FOPENERR:
1800 /* Another fatal error. */
1801 logputs (LOG_VERBOSE, "\n");
1802 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1803 *hstat.local_file, strerror (errno));
1804 free_hstat (&hstat);
1809 /* Another fatal error. */
1810 logputs (LOG_VERBOSE, "\n");
1811 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1812 free_hstat (&hstat);
1817 /* Return the new location to the caller. */
1820 logprintf (LOG_NOTQUIET,
1821 _("ERROR: Redirection (%d) without location.\n"),
1823 free_hstat (&hstat);
1827 free_hstat (&hstat);
1832 /* The file was already fully retrieved. */
1833 free_hstat (&hstat);
1838 /* Deal with you later. */
1841 /* All possibilities should have been exhausted. */
1844 if (!(*dt & RETROKF))
1848 /* #### Ugly ugly ugly! */
1849 char *hurl = url_string (u, 1);
1850 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1853 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1854 tms, hstat.statcode, hstat.error);
1855 logputs (LOG_VERBOSE, "\n");
1856 free_hstat (&hstat);
1861 /* Did we get the time-stamp? */
1864 if (opt.timestamping && !hstat.remote_time)
1866 logputs (LOG_NOTQUIET, _("\
1867 Last-modified header missing -- time-stamps turned off.\n"));
1869 else if (hstat.remote_time)
1871 /* Convert the date-string into struct tm. */
1872 tmr = http_atotm (hstat.remote_time);
1873 if (tmr == (time_t) (-1))
1874 logputs (LOG_VERBOSE, _("\
1875 Last-modified header invalid -- time-stamp ignored.\n"));
1879 /* The time-stamping section. */
1884 use_ts = 0; /* no more time-stamping */
1885 count = 0; /* the retrieve count for HEAD is
1887 if (hstat.remote_time && tmr != (time_t) (-1))
1889 /* Now time-stamping can be used validly. Time-stamping
1890 means that if the sizes of the local and remote file
1891 match, and local file is newer than the remote file,
1892 it will not be retrieved. Otherwise, the normal
1893 download procedure is resumed. */
1895 (hstat.contlen == -1 || local_size == hstat.contlen))
1897 logprintf (LOG_VERBOSE, _("\
1898 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1900 free_hstat (&hstat);
1904 else if (tml >= tmr)
1905 logprintf (LOG_VERBOSE, _("\
1906 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1908 logputs (LOG_VERBOSE,
1909 _("Remote file is newer, retrieving.\n"));
1911 free_hstat (&hstat);
1914 if ((tmr != (time_t) (-1))
1916 && ((hstat.len == hstat.contlen) ||
1917 ((hstat.res == 0) &&
1918 ((hstat.contlen == -1) ||
1919 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1921 /* #### This code repeats in http.c and ftp.c. Move it to a
1923 const char *fl = NULL;
1924 if (opt.output_document)
1926 if (opt.od_known_regular)
1927 fl = opt.output_document;
1930 fl = *hstat.local_file;
1934 /* End of time-stamping section. */
1938 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1943 tmrate = retr_rate (hstat.len - hstat.restval, hstat.dltime, 0);
1945 if (hstat.len == hstat.contlen)
1949 logprintf (LOG_VERBOSE,
1950 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1951 tms, tmrate, locf, hstat.len, hstat.contlen);
1952 logprintf (LOG_NONVERBOSE,
1953 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1954 tms, u->url, hstat.len, hstat.contlen, locf, count);
1957 total_downloaded_bytes += hstat.len;
1959 /* Remember that we downloaded the file for later ".orig" code. */
1960 if (*dt & ADDED_HTML_EXTENSION)
1961 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1963 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1965 free_hstat (&hstat);
1969 else if (hstat.res == 0) /* No read error */
1971 if (hstat.contlen == -1) /* We don't know how much we were supposed
1972 to get, so assume we succeeded. */
1976 logprintf (LOG_VERBOSE,
1977 _("%s (%s) - `%s' saved [%ld]\n\n"),
1978 tms, tmrate, locf, hstat.len);
1979 logprintf (LOG_NONVERBOSE,
1980 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1981 tms, u->url, hstat.len, locf, count);
1984 total_downloaded_bytes += hstat.len;
1986 /* Remember that we downloaded the file for later ".orig" code. */
1987 if (*dt & ADDED_HTML_EXTENSION)
1988 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1990 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1992 free_hstat (&hstat);
1996 else if (hstat.len < hstat.contlen) /* meaning we lost the
1997 connection too soon */
1999 logprintf (LOG_VERBOSE,
2000 _("%s (%s) - Connection closed at byte %ld. "),
2001 tms, tmrate, hstat.len);
2002 printwhat (count, opt.ntry);
2003 free_hstat (&hstat);
2006 else if (!opt.kill_longer) /* meaning we got more than expected */
2008 logprintf (LOG_VERBOSE,
2009 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
2010 tms, tmrate, locf, hstat.len, hstat.contlen);
2011 logprintf (LOG_NONVERBOSE,
2012 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
2013 tms, u->url, hstat.len, hstat.contlen, locf, count);
2015 total_downloaded_bytes += hstat.len;
2017 /* Remember that we downloaded the file for later ".orig" code. */
2018 if (*dt & ADDED_HTML_EXTENSION)
2019 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2021 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2023 free_hstat (&hstat);
2027 else /* the same, but not accepted */
2029 logprintf (LOG_VERBOSE,
2030 _("%s (%s) - Connection closed at byte %ld/%ld. "),
2031 tms, tmrate, hstat.len, hstat.contlen);
2032 printwhat (count, opt.ntry);
2033 free_hstat (&hstat);
2037 else /* now hstat.res can only be -1 */
2039 if (hstat.contlen == -1)
2041 logprintf (LOG_VERBOSE,
2042 _("%s (%s) - Read error at byte %ld (%s)."),
2043 tms, tmrate, hstat.len, strerror (errno));
2044 printwhat (count, opt.ntry);
2045 free_hstat (&hstat);
2048 else /* hstat.res == -1 and contlen is given */
2050 logprintf (LOG_VERBOSE,
2051 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
2052 tms, tmrate, hstat.len, hstat.contlen,
2054 printwhat (count, opt.ntry);
2055 free_hstat (&hstat);
2062 while (!opt.ntry || (count < opt.ntry));
2066 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
2067 than local timezone.
2069 mktime is similar but assumes struct tm, also known as the
2070 "broken-down" form of time, is in local time zone. mktime_from_utc
2071 uses mktime to make the conversion understanding that an offset
2072 will be introduced by the local time assumption.
2074 mktime_from_utc then measures the introduced offset by applying
2075 gmtime to the initial result and applying mktime to the resulting
2076 "broken-down" form. The difference between the two mktime results
2077 is the measured offset which is then subtracted from the initial
2078 mktime result to yield a calendar time which is the value returned.
2080 tm_isdst in struct tm is set to 0 to force mktime to introduce a
2081 consistent offset (the non DST offset) since tm and tm+o might be
2082 on opposite sides of a DST change.
2084 Some implementations of mktime return -1 for the nonexistent
2085 localtime hour at the beginning of DST. In this event, use
2086 mktime(tm - 1hr) + 3600.
2090 gmtime(t+o) --> tm+o
2091 mktime(tm+o) --> t+2o
2092 t+o - (t+2o - t+o) = t
2094 Note that glibc contains a function of the same purpose named
2095 `timegm' (reverse of gmtime). But obviously, it is not universally
2096 available, and unfortunately it is not straightforwardly
2097 extractable for use here. Perhaps configure should detect timegm
2098 and use it where available.
2100 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
2101 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
2102 Further improved by Roger with assistance from Edward J. Sabol
2103 based on input by Jamie Zawinski. */
2106 mktime_from_utc (struct tm *t)
2117 return -1; /* can't deal with output from strptime */
2128 return -1; /* can't deal with output from gmtime */
2131 return (tl - (tb - tl));
2134 /* Check whether the result of strptime() indicates success.
2135 strptime() returns the pointer to how far it got to in the string.
2136 The processing has been successful if the string is at `GMT' or
2137 `+X', or at the end of the string.
2139 In extended regexp parlance, the function returns 1 if P matches
2140 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2141 can return) is considered a failure and 0 is returned. */
2143 check_end (const char *p)
2147 while (ISSPACE (*p))
2150 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2151 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
2157 /* Convert the textual specification of time in TIME_STRING to the
2158 number of seconds since the Epoch.
2160 TIME_STRING can be in any of the three formats RFC2068 allows the
2161 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
2162 Timezones are ignored, and should be GMT.
2164 Return the computed time_t representation, or -1 if the conversion
2167 This function uses strptime with various string formats for parsing
2168 TIME_STRING. This results in a parser that is not as lenient in
2169 interpreting TIME_STRING as I would like it to be. Being based on
2170 strptime, it always allows shortened months, one-digit days, etc.,
2171 but due to the multitude of formats in which time can be
2172 represented, an ideal HTTP time parser would be even more
2173 forgiving. It should completely ignore things like week days and
2174 concentrate only on the various forms of representing years,
2175 months, days, hours, minutes, and seconds. For example, it would
2176 be nice if it accepted ISO 8601 out of the box.
2178 I've investigated free and PD code for this purpose, but none was
2179 usable. getdate was big and unwieldy, and had potential copyright
2180 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2181 distributed with phttpd, is excellent, but we cannot use it because
2182 it is not assigned to the FSF. So I stuck it with strptime. */
2185 http_atotm (const char *time_string)
2187 /* NOTE: Solaris strptime man page claims that %n and %t match white
2188 space, but that's not universally available. Instead, we simply
2189 use ` ' to mean "skip all WS", which works under all strptime
2190 implementations I've tested. */
2192 static const char *time_formats[] = {
2193 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
2194 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
2195 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
2196 (google.com uses this for their cookies.) */
2197 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2203 /* According to Roger Beeman, we need to initialize tm_isdst, since
2204 strptime won't do it. */
2207 /* Note that under foreign locales Solaris strptime() fails to
2208 recognize English dates, which renders this function useless. We
2209 solve this by being careful not to affect LC_TIME when
2210 initializing locale.
2212 Another solution would be to temporarily set locale to C, invoke
2213 strptime(), and restore it back. This is slow and dirty,
2214 however, and locale support other than LC_MESSAGES can mess other
2215 things, so I rather chose to stick with just setting LC_MESSAGES.
2217 GNU strptime does not have this problem because it recognizes
2218 both international and local dates. */
2220 for (i = 0; i < countof (time_formats); i++)
2221 if (check_end (strptime (time_string, time_formats[i], &t)))
2222 return mktime_from_utc (&t);
2224 /* All formats have failed. */
2228 /* Authorization support: We support two authorization schemes:
2230 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2232 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2233 consisting of answering to the server's challenge with the proper
2236 /* How many bytes it will take to store LEN bytes in base64. */
2237 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2239 /* Encode the string S of length LENGTH to base64 format and place it
2240 to STORE. STORE will be 0-terminated, and must point to a writable
2241 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2243 base64_encode (const char *s, char *store, int length)
2245 /* Conversion table. */
2246 static char tbl[64] = {
2247 'A','B','C','D','E','F','G','H',
2248 'I','J','K','L','M','N','O','P',
2249 'Q','R','S','T','U','V','W','X',
2250 'Y','Z','a','b','c','d','e','f',
2251 'g','h','i','j','k','l','m','n',
2252 'o','p','q','r','s','t','u','v',
2253 'w','x','y','z','0','1','2','3',
2254 '4','5','6','7','8','9','+','/'
2257 unsigned char *p = (unsigned char *)store;
2259 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2260 for (i = 0; i < length; i += 3)
2262 *p++ = tbl[s[0] >> 2];
2263 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2264 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2265 *p++ = tbl[s[2] & 0x3f];
2268 /* Pad the result if necessary... */
2269 if (i == length + 1)
2271 else if (i == length + 2)
2272 *(p - 1) = *(p - 2) = '=';
2273 /* ...and zero-terminate it. */
2277 /* Create the authentication header contents for the `Basic' scheme.
2278 This is done by encoding the string `USER:PASS' in base64 and
2279 prepending `HEADER: Basic ' to it. */
2281 basic_authentication_encode (const char *user, const char *passwd,
2284 char *t1, *t2, *res;
2285 int len1 = strlen (user) + 1 + strlen (passwd);
2286 int len2 = BASE64_LENGTH (len1);
2288 t1 = (char *)alloca (len1 + 1);
2289 sprintf (t1, "%s:%s", user, passwd);
2290 t2 = (char *)alloca (1 + len2);
2291 base64_encode (t1, t2, len1);
2292 res = (char *)xmalloc (len2 + 11 + strlen (header));
2293 sprintf (res, "%s: Basic %s\r\n", header, t2);
2299 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2300 of a field in such a header. If the field is the one specified by
2301 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2302 digest authorization code), extract its value in the (char*)
2303 variable pointed by RET. Returns negative on a malformed header,
2304 or number of bytes that have been parsed by this call. */
2306 extract_header_attr (const char *au, const char *attr_name, char **ret)
2308 const char *cp, *ep;
2312 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2314 cp += strlen (attr_name);
2317 cp += skip_lws (cp);
2322 cp += skip_lws (cp);
2327 for (ep = cp; *ep && *ep != '\"'; ep++)
2332 *ret = strdupdelim (cp, ep);
2339 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2340 an array of 16 bytes containing the hash keys, and BUF should be a
2341 buffer of 33 writable characters (32 for hex digits plus one for
2342 zero termination). */
2344 dump_hash (unsigned char *buf, const unsigned char *hash)
2348 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2350 *buf++ = XNUM_TO_digit (*hash >> 4);
2351 *buf++ = XNUM_TO_digit (*hash & 0xf);
2356 /* Take the line apart to find the challenge, and compose a digest
2357 authorization header. See RFC2069 section 2.1.2. */
2359 digest_authentication_encode (const char *au, const char *user,
2360 const char *passwd, const char *method,
2363 static char *realm, *opaque, *nonce;
2368 { "realm", &realm },
2369 { "opaque", &opaque },
2374 realm = opaque = nonce = NULL;
2376 au += 6; /* skip over `Digest' */
2381 au += skip_lws (au);
2382 for (i = 0; i < countof (options); i++)
2384 int skip = extract_header_attr (au, options[i].name,
2385 options[i].variable);
2389 FREE_MAYBE (opaque);
2399 if (i == countof (options))
2401 while (*au && *au != '=')
2405 au += skip_lws (au);
2409 while (*au && *au != '\"')
2416 while (*au && *au != ',')
2421 if (!realm || !nonce || !user || !passwd || !path || !method)
2424 FREE_MAYBE (opaque);
2429 /* Calculate the digest value. */
2431 ALLOCA_MD5_CONTEXT (ctx);
2432 unsigned char hash[MD5_HASHLEN];
2433 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2434 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2436 /* A1BUF = H(user ":" realm ":" password) */
2438 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2439 gen_md5_update ((unsigned char *)":", 1, ctx);
2440 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2441 gen_md5_update ((unsigned char *)":", 1, ctx);
2442 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2443 gen_md5_finish (ctx, hash);
2444 dump_hash (a1buf, hash);
2446 /* A2BUF = H(method ":" path) */
2448 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2449 gen_md5_update ((unsigned char *)":", 1, ctx);
2450 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2451 gen_md5_finish (ctx, hash);
2452 dump_hash (a2buf, hash);
2454 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2456 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2457 gen_md5_update ((unsigned char *)":", 1, ctx);
2458 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2459 gen_md5_update ((unsigned char *)":", 1, ctx);
2460 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2461 gen_md5_finish (ctx, hash);
2462 dump_hash (response_digest, hash);
2464 res = (char*) xmalloc (strlen (user)
2469 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2470 + (opaque ? strlen (opaque) : 0)
2472 sprintf (res, "Authorization: Digest \
2473 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2474 user, realm, nonce, path, response_digest);
2477 char *p = res + strlen (res);
2478 strcat (p, ", opaque=\"");
2482 strcat (res, "\r\n");
2486 #endif /* USE_DIGEST */
2489 #define BEGINS_WITH(line, string_constant) \
2490 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2491 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2492 || !line[sizeof (string_constant) - 1]))
2495 known_authentication_scheme_p (const char *au)
2497 return BEGINS_WITH (au, "Basic")
2498 || BEGINS_WITH (au, "Digest")
2499 || BEGINS_WITH (au, "NTLM");
2504 /* Create the HTTP authorization request header. When the
2505 `WWW-Authenticate' response header is seen, according to the
2506 authorization scheme specified in that header (`Basic' and `Digest'
2507 are supported by the current implementation), produce an
2508 appropriate HTTP authorization request header. */
2510 create_authorization_line (const char *au, const char *user,
2511 const char *passwd, const char *method,
2514 char *wwwauth = NULL;
2516 if (!strncasecmp (au, "Basic", 5))
2517 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2518 if (!strncasecmp (au, "NTLM", 4))
2519 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2521 else if (!strncasecmp (au, "Digest", 6))
2522 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2523 #endif /* USE_DIGEST */
2530 if (pc_last_host_ip)
2531 address_list_release (pc_last_host_ip);