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_handle_set_cookie (wget_cookie_jar, u->host, u->port, u->path, hdr);
352 /* Persistent connections. Currently, we cache the most recently used
353 connection as persistent, provided that the HTTP server agrees to
354 make it such. The persistence data is stored in the variables
355 below. Ideally, it would be in a structure, and it should be
356 possible to cache an arbitrary fixed number of these connections.
358 I think the code is quite easy to extend in that direction. */
360 /* Whether a persistent connection is active. */
361 static int pc_active_p;
362 /* Host and port of currently active persistent connection. */
363 static struct address_list *pc_last_host_ip;
364 static unsigned short pc_last_port;
366 /* File descriptor of the currently active persistent connection. */
367 static int pc_last_fd;
370 /* Whether a ssl handshake has occoured on this connection */
371 static int pc_active_ssl;
372 /* SSL connection of the currently active persistent connection. */
373 static SSL *pc_last_ssl;
374 #endif /* HAVE_SSL */
376 /* Mark the persistent connection as invalid. This is used by the
377 CLOSE_* macros after they forcefully close a registered persistent
378 connection. This does not close the file descriptor -- it is left
379 to the caller to do that. (Maybe it should, though.) */
382 invalidate_persistent (void)
387 #endif /* HAVE_SSL */
388 if (pc_last_host_ip != NULL)
390 address_list_release (pc_last_host_ip);
391 pc_last_host_ip = NULL;
393 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
396 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
397 persistent. This will enable someone to use the same connection
398 later. In the context of HTTP, this must be called only AFTER the
399 response has been received and the server has promised that the
400 connection will remain alive.
402 If a previous connection was persistent, it is closed. */
406 register_persistent (const char *host, unsigned short port, int fd, SSL *ssl)
410 register_persistent (const char *host, unsigned short port, int fd)
415 if (pc_last_fd == fd)
417 /* The connection FD is already registered. Nothing to
423 /* The old persistent connection is still active; let's
424 close it first. This situation arises whenever a
425 persistent connection exists, but we then connect to a
426 different host, and try to register a persistent
427 connection to that one. */
429 /* The ssl disconnect has to take place before the closing
432 shutdown_ssl(pc_last_ssl);
435 invalidate_persistent ();
439 assert (pc_last_host_ip == NULL);
441 /* This lookup_host cannot fail, because it has the results in the
443 pc_last_host_ip = lookup_host (host, LH_SILENT);
444 assert (pc_last_host_ip != NULL);
451 pc_active_ssl = ssl ? 1 : 0;
453 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
457 # define SHUTDOWN_SSL(ssl) do { \
459 shutdown_ssl (ssl); \
462 # define SHUTDOWN_SSL(ssl)
465 /* Return non-zero if a persistent connection is available for
466 connecting to HOST:PORT. */
470 persistent_available_p (const char *host, unsigned short port, int ssl)
474 persistent_available_p (const char *host, unsigned short port)
478 struct address_list *this_host_ip;
480 /* First, check whether a persistent connection is active at all. */
483 /* Second, check if the active connection pertains to the correct
484 (HOST, PORT) ordered pair. */
485 if (port != pc_last_port)
489 /* Second, a): check if current connection is (not) ssl, too. This
490 test is unlikely to fail because HTTP and HTTPS typicaly use
491 different ports. Yet it is possible, or so I [Christian
492 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
494 if (ssl != pc_active_ssl)
496 #endif /* HAVE_SSL */
498 this_host_ip = lookup_host (host, LH_SILENT);
502 /* To equate the two host names for the purposes of persistent
503 connections, they need to share all the IP addresses in the
505 success = address_list_match_all (pc_last_host_ip, this_host_ip);
506 address_list_release (this_host_ip);
510 /* Third: check whether the connection is still open. This is
511 important because most server implement a liberal (short) timeout
512 on persistent connections. Wget can of course always reconnect
513 if the connection doesn't work out, but it's nicer to know in
514 advance. This test is a logical followup of the first test, but
515 is "expensive" and therefore placed at the end of the list. */
516 if (!test_socket_open (pc_last_fd))
518 /* Oops, the socket is no longer open. Now that we know that,
519 let's invalidate the persistent connection before returning
523 SHUTDOWN_SSL (pc_last_ssl);
526 invalidate_persistent ();
532 /* The idea behind these two CLOSE macros is to distinguish between
533 two cases: one when the job we've been doing is finished, and we
534 want to close the connection and leave, and two when something is
535 seriously wrong and we're closing the connection as part of
538 In case of keep_alive, CLOSE_FINISH should leave the connection
539 open, while CLOSE_INVALIDATE should still close it.
541 Note that the semantics of the flag `keep_alive' is "this
542 connection *will* be reused (the server has promised not to close
543 the connection once we're done)", while the semantics of
544 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
545 active, registered connection". */
547 #define CLOSE_FINISH(fd) do { \
550 SHUTDOWN_SSL (ssl); \
552 if (pc_active_p && (fd) == pc_last_fd) \
553 invalidate_persistent (); \
557 #define CLOSE_INVALIDATE(fd) do { \
558 SHUTDOWN_SSL (ssl); \
560 if (pc_active_p && (fd) == pc_last_fd) \
561 invalidate_persistent (); \
566 long len; /* received length */
567 long contlen; /* expected length */
568 long restval; /* the restart value */
569 int res; /* the result of last read */
570 char *newloc; /* new location (redirection) */
571 char *remote_time; /* remote time-stamp string */
572 char *error; /* textual HTTP error */
573 int statcode; /* status code */
574 double dltime; /* time of the download in msecs */
575 int no_truncate; /* whether truncating the file is
577 const char *referer; /* value of the referer header. */
578 char **local_file; /* local file. */
582 free_hstat (struct http_stat *hs)
584 xfree_null (hs->newloc);
585 xfree_null (hs->remote_time);
586 xfree_null (hs->error);
588 /* Guard against being called twice. */
590 hs->remote_time = NULL;
594 static char *create_authorization_line PARAMS ((const char *, const char *,
595 const char *, const char *,
597 static char *basic_authentication_encode PARAMS ((const char *, const char *,
599 static int known_authentication_scheme_p PARAMS ((const char *));
601 time_t http_atotm PARAMS ((const char *));
603 #define BEGINS_WITH(line, string_constant) \
604 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
605 && (ISSPACE (line[sizeof (string_constant) - 1]) \
606 || !line[sizeof (string_constant) - 1]))
608 /* Retrieve a document through HTTP protocol. It recognizes status
609 code, and correctly handles redirections. It closes the network
610 socket. If it receives an error from the functions below it, it
611 will print it if there is enough information to do so (almost
612 always), returning the error to the caller (i.e. http_loop).
614 Various HTTP parameters are stored to hs. Although it parses the
615 response code correctly, it is not used in a sane way. The caller
618 If PROXY is non-NULL, the connection will be made to the proxy
619 server, and u->url will be requested. */
621 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
623 char *request, *type, *command, *full_path;
625 char *pragma_h, *referer, *useragent, *range, *wwwauth;
626 char *authenticate_h;
630 char *request_keep_alive;
631 int sock, hcount, all_length, statcode;
633 long contlen, contrange;
636 int auth_tried_already;
639 static SSL_CTX *ssl_ctx = NULL;
642 char *cookies = NULL;
644 /* Whether this connection will be kept alive after the HTTP request
648 /* Flags that detect the two ways of specifying HTTP keep-alive
650 int http_keep_alive_1, http_keep_alive_2;
652 /* Whether keep-alive should be inhibited. */
653 int inhibit_keep_alive;
655 /* Whether we need to print the host header with braces around host,
656 e.g. "Host: [3ffe:8100:200:2::2]:1234" instead of the usual
657 "Host: symbolic-name:1234". */
658 int squares_around_host = 0;
660 /* Headers sent when using POST. */
661 char *post_content_type, *post_content_length;
662 long post_data_size = 0;
665 /* initialize ssl_ctx on first run */
668 uerr_t err = init_ssl (&ssl_ctx);
673 case SSLERRCTXCREATE:
675 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
679 /* try without certfile */
680 logprintf (LOG_NOTQUIET,
681 _("Failed to load certificates from %s\n"),
684 logprintf (LOG_NOTQUIET,
685 _("Trying without the specified certificate\n"));
688 logprintf (LOG_NOTQUIET,
689 _("Failed to get certificate key from %s\n"),
692 logprintf (LOG_NOTQUIET,
693 _("Trying without the specified certificate\n"));
700 #endif /* HAVE_SSL */
702 if (!(*dt & HEAD_ONLY))
703 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
704 know the local filename so we can save to it. */
705 assert (*hs->local_file != NULL);
708 auth_tried_already = 0;
710 inhibit_keep_alive = !opt.http_keep_alive || proxy != NULL;
713 /* We need to come back here when the initial attempt to retrieve
714 without authorization header fails. (Expected to happen at least
715 for the Digest authorization scheme.) */
718 http_keep_alive_1 = http_keep_alive_2 = 0;
720 post_content_type = NULL;
721 post_content_length = NULL;
723 /* Initialize certain elements of struct http_stat. */
728 hs->remote_time = NULL;
731 /* If we're using a proxy, we will be connecting to the proxy
733 conn = proxy ? proxy : u;
735 /* First: establish the connection. */
736 if (inhibit_keep_alive
739 !persistent_available_p (conn->host, conn->port)
741 !persistent_available_p (conn->host, conn->port,
742 u->scheme == SCHEME_HTTPS)
743 #endif /* HAVE_SSL */
746 sock = connect_to_host (conn->host, conn->port);
750 return CONNECT_ERROR (errno);
753 if (conn->scheme == SCHEME_HTTPS)
754 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
756 logputs (LOG_VERBOSE, "\n");
757 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
762 #endif /* HAVE_SSL */
766 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"),
767 conn->host, conn->port);
768 /* #### pc_last_fd should be accessed through an accessor
773 #endif /* HAVE_SSL */
774 DEBUGP (("Reusing fd %d.\n", sock));
779 else if (opt.post_file_name || opt.post_data)
787 referer = (char *)alloca (9 + strlen (hs->referer) + 3);
788 sprintf (referer, "Referer: %s\r\n", hs->referer);
791 if (*dt & SEND_NOCACHE)
792 pragma_h = "Pragma: no-cache\r\n";
798 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
799 /* Gag me! Some servers (e.g. WebSitePro) have been known to
800 respond to the following `Range' format by generating a
801 multipart/x-byte-ranges MIME document! This MIME type was
802 present in an old draft of the byteranges specification.
803 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
804 only if multiple non-overlapping ranges are requested --
805 which Wget never does. */
806 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
811 STRDUP_ALLOCA (useragent, opt.useragent);
814 useragent = (char *)alloca (10 + strlen (version_string));
815 sprintf (useragent, "Wget/%s", version_string);
817 /* Construct the authentication, if userid is present. */
820 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
821 user = user ? user : opt.http_user;
822 passwd = passwd ? passwd : opt.http_passwd;
829 /* We have the username and the password, but haven't tried
830 any authorization yet. Let's see if the "Basic" method
831 works. If not, we'll come back here and construct a
832 proper authorization method with the right challenges.
834 If we didn't employ this kind of logic, every URL that
835 requires authorization would have to be processed twice,
836 which is very suboptimal and generates a bunch of false
837 "unauthorized" errors in the server log.
839 #### But this logic also has a serious problem when used
840 with stronger authentications: we *first* transmit the
841 username and the password in clear text, and *then*
842 attempt a stronger authentication scheme. That cannot be
843 right! We are only fortunate that almost everyone still
844 uses the `Basic' scheme anyway.
846 There should be an option to prevent this from happening,
847 for those who use strong authentication schemes and value
849 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
853 /* Use the full path, i.e. one that includes the leading
854 slash and the query string, but is independent of proxy
856 char *pth = url_full_path (u);
857 wwwauth = create_authorization_line (authenticate_h, user, passwd,
866 char *proxy_user, *proxy_passwd;
867 /* For normal username and password, URL components override
868 command-line/wgetrc parameters. With proxy authentication,
869 it's the reverse, because proxy URLs are normally the
870 "permanent" ones, so command-line args should take
872 if (opt.proxy_user && opt.proxy_passwd)
874 proxy_user = opt.proxy_user;
875 proxy_passwd = opt.proxy_passwd;
879 proxy_user = proxy->user;
880 proxy_passwd = proxy->passwd;
882 /* #### This does not appear right. Can't the proxy request,
883 say, `Digest' authentication? */
884 if (proxy_user && proxy_passwd)
885 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
886 "Proxy-Authorization");
889 /* String of the form :PORT. Used only for non-standard ports. */
891 if (u->port != scheme_default_port (u->scheme))
893 port_maybe = (char *)alloca (numdigit (u->port) + 2);
894 sprintf (port_maybe, ":%d", u->port);
897 if (!inhibit_keep_alive)
898 request_keep_alive = "Connection: Keep-Alive\r\n";
900 request_keep_alive = NULL;
903 cookies = cookie_header (wget_cookie_jar, u->host, u->port, u->path,
905 u->scheme == SCHEME_HTTPS
911 if (opt.post_data || opt.post_file_name)
913 post_content_type = "Content-Type: application/x-www-form-urlencoded\r\n";
915 post_data_size = strlen (opt.post_data);
918 post_data_size = file_size (opt.post_file_name);
919 if (post_data_size == -1)
921 logprintf (LOG_NOTQUIET, "POST data file missing: %s\n",
926 post_content_length = xmalloc (16 + numdigit (post_data_size) + 2 + 1);
927 sprintf (post_content_length,
928 "Content-Length: %ld\r\n", post_data_size);
932 full_path = xstrdup (u->url);
934 /* Use the full path, i.e. one that includes the leading slash and
935 the query string. E.g. if u->path is "foo/bar" and u->query is
936 "param=value", full_path will be "/foo/bar?param=value". */
937 full_path = url_full_path (u);
939 if (strchr (u->host, ':'))
940 squares_around_host = 1;
942 /* Allocate the memory for the request. */
943 request = (char *)alloca (strlen (command)
947 + (port_maybe ? strlen (port_maybe) : 0)
948 + strlen (HTTP_ACCEPT)
949 + (request_keep_alive
950 ? strlen (request_keep_alive) : 0)
951 + (referer ? strlen (referer) : 0)
952 + (cookies ? strlen (cookies) : 0)
953 + (wwwauth ? strlen (wwwauth) : 0)
954 + (proxyauth ? strlen (proxyauth) : 0)
955 + (range ? strlen (range) : 0)
958 ? strlen (post_content_type) : 0)
959 + (post_content_length
960 ? strlen (post_content_length) : 0)
961 + (opt.user_header ? strlen (opt.user_header) : 0)
963 /* Construct the request. */
969 %s%s%s%s%s%s%s%s%s%s\r\n",
972 squares_around_host ? "[" : "", u->host, squares_around_host ? "]" : "",
973 port_maybe ? port_maybe : "",
975 request_keep_alive ? request_keep_alive : "",
976 referer ? referer : "",
977 cookies ? cookies : "",
978 wwwauth ? wwwauth : "",
979 proxyauth ? proxyauth : "",
982 post_content_type ? post_content_type : "",
983 post_content_length ? post_content_length : "",
984 opt.user_header ? opt.user_header : "");
985 DEBUGP (("---request begin---\n%s", request));
987 /* Free the temporary memory. */
988 xfree_null (wwwauth);
989 xfree_null (proxyauth);
990 xfree_null (cookies);
993 /* Send the request to server. */
995 if (conn->scheme == SCHEME_HTTPS)
996 write_error = ssl_iwrite (ssl, request, strlen (request));
999 write_error = iwrite (sock, request, strlen (request));
1001 if (write_error >= 0)
1005 DEBUGP (("[POST data: %s]\n", opt.post_data));
1007 if (conn->scheme == SCHEME_HTTPS)
1008 write_error = ssl_iwrite (ssl, opt.post_data, post_data_size);
1011 write_error = iwrite (sock, opt.post_data, post_data_size);
1013 else if (opt.post_file_name && post_data_size != 0)
1016 if (conn->scheme == SCHEME_HTTPS)
1017 write_error = post_file (-1, ssl, opt.post_file_name,
1021 write_error = post_file (sock, NULL, opt.post_file_name,
1025 DEBUGP (("---request end---\n"));
1027 if (write_error < 0)
1029 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
1031 CLOSE_INVALIDATE (sock);
1034 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1035 proxy ? "Proxy" : "HTTP");
1036 contlen = contrange = -1;
1041 /* Before reading anything, initialize the rbuf. */
1042 rbuf_initialize (&rbuf, sock);
1044 if (conn->scheme == SCHEME_HTTPS)
1048 #endif /* HAVE_SSL */
1051 /* Header-fetching loop. */
1059 /* Get the header. */
1060 status = header_get (&rbuf, &hdr,
1061 /* Disallow continuations for status line. */
1062 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
1064 /* Check for errors. */
1065 if (status == HG_EOF && *hdr)
1067 /* This used to be an unconditional error, but that was
1068 somewhat controversial, because of a large number of
1069 broken CGI's that happily "forget" to send the second EOL
1070 before closing the connection of a HEAD request.
1072 So, the deal is to check whether the header is empty
1073 (*hdr is zero if it is); if yes, it means that the
1074 previous header was fully retrieved, and that -- most
1075 probably -- the request is complete. "...be liberal in
1076 what you accept." Oh boy. */
1077 logputs (LOG_VERBOSE, "\n");
1078 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
1081 xfree_null (all_headers);
1082 CLOSE_INVALIDATE (sock);
1085 else if (status == HG_ERROR)
1087 logputs (LOG_VERBOSE, "\n");
1088 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1092 xfree_null (all_headers);
1093 CLOSE_INVALIDATE (sock);
1097 /* If the headers are to be saved to a file later, save them to
1099 if (opt.save_headers)
1101 int lh = strlen (hdr);
1102 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
1103 memcpy (all_headers + all_length, hdr, lh);
1105 all_headers[all_length++] = '\n';
1106 all_headers[all_length] = '\0';
1109 /* Check for status line. */
1113 /* Parse the first line of server response. */
1114 statcode = parse_http_status_line (hdr, &error);
1115 hs->statcode = statcode;
1116 /* Store the descriptive response. */
1117 if (statcode == -1) /* malformed response */
1119 /* A common reason for "malformed response" error is the
1120 case when no data was actually received. Handle this
1123 hs->error = xstrdup (_("No data received"));
1125 hs->error = xstrdup (_("Malformed status line"));
1130 hs->error = xstrdup (_("(no description)"));
1132 hs->error = xstrdup (error);
1134 if ((statcode != -1)
1140 if (opt.server_response)
1141 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
1143 logprintf (LOG_VERBOSE, "%2d %s", statcode, error);
1149 /* Exit on empty header. */
1156 /* Print the header if requested. */
1157 if (opt.server_response && hcount != 1)
1158 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
1160 /* Try getting content-length. */
1161 if (contlen == -1 && !opt.ignore_length)
1162 if (header_process (hdr, "Content-Length", header_extract_number,
1165 /* Try getting content-type. */
1167 if (header_process (hdr, "Content-Type", http_process_type, &type))
1169 /* Try getting location. */
1171 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1173 /* Try getting last-modified. */
1174 if (!hs->remote_time)
1175 if (header_process (hdr, "Last-Modified", header_strdup,
1178 /* Try getting cookies. */
1180 if (header_process (hdr, "Set-Cookie", http_process_set_cookie, u))
1182 /* Try getting www-authentication. */
1183 if (!authenticate_h)
1184 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1187 /* Check for accept-ranges header. If it contains the word
1188 `none', disable the ranges. */
1189 if (*dt & ACCEPTRANGES)
1192 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1195 *dt &= ~ACCEPTRANGES;
1199 /* Try getting content-range. */
1200 if (contrange == -1)
1202 struct http_process_range_closure closure;
1203 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1205 contrange = closure.first_byte_pos;
1209 /* Check for keep-alive related responses. */
1210 if (!inhibit_keep_alive)
1212 /* Check for the `Keep-Alive' header. */
1213 if (!http_keep_alive_1)
1215 if (header_process (hdr, "Keep-Alive", header_exists,
1216 &http_keep_alive_1))
1219 /* Check for `Connection: Keep-Alive'. */
1220 if (!http_keep_alive_2)
1222 if (header_process (hdr, "Connection", http_process_connection,
1223 &http_keep_alive_2))
1231 logputs (LOG_VERBOSE, "\n");
1234 && (http_keep_alive_1 || http_keep_alive_2))
1236 assert (inhibit_keep_alive == 0);
1240 /* The server has promised that it will not close the connection
1241 when we're done. This means that we can register it. */
1243 register_persistent (conn->host, conn->port, sock);
1245 register_persistent (conn->host, conn->port, sock, ssl);
1246 #endif /* HAVE_SSL */
1248 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1251 /* Authorization is required. */
1255 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1256 might be more bytes in the body. */
1257 if (auth_tried_already)
1259 /* If we have tried it already, then there is not point
1262 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1263 xfree (authenticate_h);
1266 else if (!known_authentication_scheme_p (authenticate_h))
1268 xfree (authenticate_h);
1269 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1272 else if (BEGINS_WITH (authenticate_h, "Basic"))
1274 /* The authentication scheme is basic, the one we try by
1275 default, and it failed. There's no sense in trying
1281 auth_tried_already = 1;
1285 /* We do not need this anymore. */
1288 xfree (authenticate_h);
1289 authenticate_h = NULL;
1292 /* 20x responses are counted among successful by default. */
1293 if (H_20X (statcode))
1296 /* Return if redirected. */
1297 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1299 /* RFC2068 says that in case of the 300 (multiple choices)
1300 response, the server can output a preferred URL through
1301 `Location' header; otherwise, the request should be treated
1302 like GET. So, if the location is set, it will be a
1303 redirection; otherwise, just proceed normally. */
1304 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1308 logprintf (LOG_VERBOSE,
1309 _("Location: %s%s\n"),
1310 hs->newloc ? hs->newloc : _("unspecified"),
1311 hs->newloc ? _(" [following]") : "");
1312 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1313 might be more bytes in the body. */
1315 xfree_null (all_headers);
1320 /* If content-type is not given, assume text/html. This is because
1321 of the multitude of broken CGI's that "forget" to generate the
1324 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) ||
1325 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S)))
1330 if (opt.html_extension && (*dt & TEXTHTML))
1331 /* -E / --html-extension / html_extension = on was specified, and this is a
1332 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1333 already the file's suffix, tack on ".html". */
1335 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1337 if (last_period_in_local_filename == NULL
1338 || !(0 == strcasecmp (last_period_in_local_filename, ".htm")
1339 || 0 == strcasecmp (last_period_in_local_filename, ".html")))
1341 size_t local_filename_len = strlen(*hs->local_file);
1343 *hs->local_file = xrealloc(*hs->local_file,
1344 local_filename_len + sizeof(".html"));
1345 strcpy(*hs->local_file + local_filename_len, ".html");
1347 *dt |= ADDED_HTML_EXTENSION;
1351 if (contrange == -1)
1353 /* We did not get a content-range header. This means that the
1354 server did not honor our `Range' request. Normally, this
1355 means we should reset hs->restval and continue normally. */
1357 /* However, if `-c' is used, we need to be a bit more careful:
1359 1. If `-c' is specified and the file already existed when
1360 Wget was started, it would be a bad idea for us to start
1361 downloading it from scratch, effectively truncating it. I
1362 believe this cannot happen unless `-c' was specified.
1364 2. If `-c' is used on a file that is already fully
1365 downloaded, we're requesting bytes after the end of file,
1366 which can result in server not honoring `Range'. If this is
1367 the case, `Content-Length' will be equal to the length of the
1369 if (opt.always_rest)
1371 /* Check for condition #2. */
1372 if (hs->restval > 0 /* restart was requested. */
1373 && contlen != -1 /* we got content-length. */
1374 && hs->restval >= contlen /* file fully downloaded
1378 logputs (LOG_VERBOSE, _("\
1379 \n The file is already fully retrieved; nothing to do.\n\n"));
1380 /* In case the caller inspects. */
1383 /* Mark as successfully retrieved. */
1386 xfree_null (all_headers);
1387 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1388 might be more bytes in the body. */
1389 return RETRUNNEEDED;
1392 /* Check for condition #1. */
1393 if (hs->no_truncate)
1395 logprintf (LOG_NOTQUIET,
1398 Continued download failed on this file, which conflicts with `-c'.\n\
1399 Refusing to truncate existing file `%s'.\n\n"), *hs->local_file);
1401 xfree_null (all_headers);
1402 CLOSE_INVALIDATE (sock);
1403 return CONTNOTSUPPORTED;
1411 else if (contrange != hs->restval ||
1412 (H_PARTIAL (statcode) && contrange == -1))
1414 /* This means the whole request was somehow misunderstood by the
1415 server. Bail out. */
1417 xfree_null (all_headers);
1418 CLOSE_INVALIDATE (sock);
1425 contlen += contrange;
1427 contrange = -1; /* If conent-length was not sent,
1428 content-range will be ignored. */
1430 hs->contlen = contlen;
1434 if ((*dt & RETROKF) && !opt.server_response)
1436 /* No need to print this output if the body won't be
1437 downloaded at all, or if the original server response is
1439 logputs (LOG_VERBOSE, _("Length: "));
1442 logputs (LOG_VERBOSE, legible (contlen));
1443 if (contrange != -1)
1444 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1445 legible (contlen - contrange));
1448 logputs (LOG_VERBOSE,
1449 opt.ignore_length ? _("ignored") : _("unspecified"));
1451 logprintf (LOG_VERBOSE, " [%s]\n", type);
1453 logputs (LOG_VERBOSE, "\n");
1457 type = NULL; /* We don't need it any more. */
1459 /* Return if we have no intention of further downloading. */
1460 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1462 /* In case the caller cares to look... */
1466 xfree_null (all_headers);
1467 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1468 might be more bytes in the body. */
1469 return RETRFINISHED;
1472 /* Open the local file. */
1475 mkalldirs (*hs->local_file);
1477 rotate_backups (*hs->local_file);
1478 fp = fopen (*hs->local_file, hs->restval ? "ab" : "wb");
1481 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1482 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1483 might be more bytes in the body. */
1484 xfree_null (all_headers);
1490 extern int global_download_count;
1492 /* To ensure that repeated "from scratch" downloads work for -O
1493 files, we rewind the file pointer, unless restval is
1494 non-zero. (This works only when -O is used on regular files,
1495 but it's still a valuable feature.)
1497 However, this loses when more than one URL is specified on
1498 the command line the second rewinds eradicates the contents
1499 of the first download. Thus we disable the above trick for
1500 all the downloads except the very first one.
1502 #### A possible solution to this would be to remember the
1503 file position in the output document and to seek to that
1504 position, instead of rewinding.
1506 We don't truncate stdout, since that breaks
1507 "wget -O - [...] >> foo".
1509 if (!hs->restval && global_download_count == 0 && opt.dfp != stdout)
1511 /* This will silently fail for streams that don't correspond
1512 to regular files, but that's OK. */
1514 /* ftruncate is needed because opt.dfp is opened in append
1515 mode if opt.always_rest is set. */
1516 ftruncate (fileno (fp), 0);
1521 /* #### This confuses the code that checks for file size. There
1522 should be some overhead information. */
1523 if (opt.save_headers)
1524 fwrite (all_headers, 1, all_length, fp);
1526 /* Get the contents of the document. */
1527 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1528 (contlen != -1 ? contlen : 0),
1529 &rbuf, keep_alive, &hs->dltime);
1532 CLOSE_FINISH (sock);
1534 CLOSE_INVALIDATE (sock);
1537 /* Close or flush the file. We have to be careful to check for
1538 error here. Checking the result of fwrite() is not enough --
1539 errors could go unnoticed! */
1542 flush_res = fclose (fp);
1544 flush_res = fflush (fp);
1545 if (flush_res == EOF)
1548 xfree_null (all_headers);
1551 return RETRFINISHED;
1554 /* The genuine HTTP loop! This is the part where the retrieval is
1555 retried, and retried, and retried, and... */
1557 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1558 int *dt, struct url *proxy)
1561 int use_ts, got_head = 0; /* time-stamping info */
1562 char *filename_plus_orig_suffix;
1563 char *local_filename = NULL;
1564 char *tms, *locf, *tmrate;
1566 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1567 long local_size = 0; /* the size of the local file */
1568 size_t filename_len;
1569 struct http_stat hstat; /* HTTP status */
1573 /* This used to be done in main(), but it's a better idea to do it
1574 here so that we don't go through the hoops if we're just using
1578 if (!wget_cookie_jar)
1579 wget_cookie_jar = cookie_jar_new ();
1580 if (opt.cookies_input && !cookies_loaded_p)
1582 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
1583 cookies_loaded_p = 1;
1589 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1590 has_wildcards_p because it would also warn on `?', and we know that
1591 shows up in CGI paths a *lot*. */
1592 if (strchr (u->url, '*'))
1593 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1595 /* Determine the local filename. */
1596 if (local_file && *local_file)
1597 hstat.local_file = local_file;
1598 else if (local_file)
1600 *local_file = url_file_name (u);
1601 hstat.local_file = local_file;
1605 dummy = url_file_name (u);
1606 hstat.local_file = &dummy;
1609 if (!opt.output_document)
1610 locf = *hstat.local_file;
1612 locf = opt.output_document;
1614 hstat.referer = referer;
1616 filename_len = strlen (*hstat.local_file);
1617 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1619 if (opt.noclobber && file_exists_p (*hstat.local_file))
1621 /* If opt.noclobber is turned on and file already exists, do not
1622 retrieve the file */
1623 logprintf (LOG_VERBOSE, _("\
1624 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
1625 /* If the file is there, we suppose it's retrieved OK. */
1628 /* #### Bogusness alert. */
1629 /* If its suffix is "html" or "htm" or similar, assume text/html. */
1630 if (has_html_suffix_p (*hstat.local_file))
1638 if (opt.timestamping)
1640 int local_dot_orig_file_exists = 0;
1642 if (opt.backup_converted)
1643 /* If -K is specified, we'll act on the assumption that it was specified
1644 last time these files were downloaded as well, and instead of just
1645 comparing local file X against server file X, we'll compare local
1646 file X.orig (if extant, else X) against server file X. If -K
1647 _wasn't_ specified last time, or the server contains files called
1648 *.orig, -N will be back to not operating correctly with -k. */
1650 /* Would a single s[n]printf() call be faster? --dan
1652 Definitely not. sprintf() is horribly slow. It's a
1653 different question whether the difference between the two
1654 affects a program. Usually I'd say "no", but at one
1655 point I profiled Wget, and found that a measurable and
1656 non-negligible amount of time was lost calling sprintf()
1657 in url.c. Replacing sprintf with inline calls to
1658 strcpy() and long_to_string() made a difference.
1660 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
1661 memcpy (filename_plus_orig_suffix + filename_len,
1662 ".orig", sizeof (".orig"));
1664 /* Try to stat() the .orig file. */
1665 if (stat (filename_plus_orig_suffix, &st) == 0)
1667 local_dot_orig_file_exists = 1;
1668 local_filename = filename_plus_orig_suffix;
1672 if (!local_dot_orig_file_exists)
1673 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1674 if (stat (*hstat.local_file, &st) == 0)
1675 local_filename = *hstat.local_file;
1677 if (local_filename != NULL)
1678 /* There was a local file, so we'll check later to see if the version
1679 the server has is the same version we already have, allowing us to
1685 /* Modification time granularity is 2 seconds for Windows, so
1686 increase local time by 1 second for later comparison. */
1689 local_size = st.st_size;
1693 /* Reset the counter. */
1695 *dt = 0 | ACCEPTRANGES;
1699 /* Increment the pass counter. */
1701 sleep_between_retrievals (count);
1702 /* Get the current time string. */
1703 tms = time_str (NULL);
1704 /* Print fetch message, if opt.verbose. */
1707 char *hurl = url_string (u, 1);
1711 sprintf (tmp, _("(try:%2d)"), count);
1712 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1713 tms, hurl, tmp, locf);
1715 ws_changetitle (hurl, 1);
1720 /* Default document type is empty. However, if spider mode is
1721 on or time-stamping is employed, HEAD_ONLY commands is
1722 encoded within *dt. */
1723 if (opt.spider || (use_ts && !got_head))
1727 /* Assume no restarting. */
1729 /* Decide whether or not to restart. */
1730 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1731 /* #### this calls access() and then stat(); could be optimized. */
1732 && file_exists_p (locf))
1733 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1734 hstat.restval = st.st_size;
1736 /* In `-c' is used and the file is existing and non-empty,
1737 refuse to truncate it if the server doesn't support continued
1739 hstat.no_truncate = 0;
1740 if (opt.always_rest && hstat.restval)
1741 hstat.no_truncate = 1;
1743 /* Decide whether to send the no-cache directive. We send it in
1745 a) we're using a proxy, and we're past our first retrieval.
1746 Some proxies are notorious for caching incomplete data, so
1747 we require a fresh get.
1748 b) caching is explicitly inhibited. */
1749 if ((proxy && count > 1) /* a */
1750 || !opt.allow_cache /* b */
1752 *dt |= SEND_NOCACHE;
1754 *dt &= ~SEND_NOCACHE;
1756 /* Try fetching the document, or at least its head. */
1757 err = gethttp (u, &hstat, dt, proxy);
1759 /* It's unfortunate that wget determines the local filename before finding
1760 out the Content-Type of the file. Barring a major restructuring of the
1761 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1762 *hstat.local_file to tack on ".html". */
1763 if (!opt.output_document)
1764 locf = *hstat.local_file;
1766 locf = opt.output_document;
1769 tms = time_str (NULL);
1770 /* Get the new location (with or without the redirection). */
1772 *newloc = xstrdup (hstat.newloc);
1775 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1776 case CONERROR: case READERR: case WRITEFAILED:
1778 /* Non-fatal errors continue executing the loop, which will
1779 bring them to "while" statement at the end, to judge
1780 whether the number of tries was exceeded. */
1781 free_hstat (&hstat);
1782 printwhat (count, opt.ntry);
1785 case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED:
1786 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1787 /* Fatal errors just return from the function. */
1788 free_hstat (&hstat);
1792 case FWRITEERR: case FOPENERR:
1793 /* Another fatal error. */
1794 logputs (LOG_VERBOSE, "\n");
1795 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1796 *hstat.local_file, strerror (errno));
1797 free_hstat (&hstat);
1802 /* Another fatal error. */
1803 logputs (LOG_VERBOSE, "\n");
1804 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1805 free_hstat (&hstat);
1810 /* Return the new location to the caller. */
1813 logprintf (LOG_NOTQUIET,
1814 _("ERROR: Redirection (%d) without location.\n"),
1816 free_hstat (&hstat);
1820 free_hstat (&hstat);
1825 /* The file was already fully retrieved. */
1826 free_hstat (&hstat);
1831 /* Deal with you later. */
1834 /* All possibilities should have been exhausted. */
1837 if (!(*dt & RETROKF))
1841 /* #### Ugly ugly ugly! */
1842 char *hurl = url_string (u, 1);
1843 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1846 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1847 tms, hstat.statcode, hstat.error);
1848 logputs (LOG_VERBOSE, "\n");
1849 free_hstat (&hstat);
1854 /* Did we get the time-stamp? */
1857 if (opt.timestamping && !hstat.remote_time)
1859 logputs (LOG_NOTQUIET, _("\
1860 Last-modified header missing -- time-stamps turned off.\n"));
1862 else if (hstat.remote_time)
1864 /* Convert the date-string into struct tm. */
1865 tmr = http_atotm (hstat.remote_time);
1866 if (tmr == (time_t) (-1))
1867 logputs (LOG_VERBOSE, _("\
1868 Last-modified header invalid -- time-stamp ignored.\n"));
1872 /* The time-stamping section. */
1877 use_ts = 0; /* no more time-stamping */
1878 count = 0; /* the retrieve count for HEAD is
1880 if (hstat.remote_time && tmr != (time_t) (-1))
1882 /* Now time-stamping can be used validly. Time-stamping
1883 means that if the sizes of the local and remote file
1884 match, and local file is newer than the remote file,
1885 it will not be retrieved. Otherwise, the normal
1886 download procedure is resumed. */
1888 (hstat.contlen == -1 || local_size == hstat.contlen))
1890 logprintf (LOG_VERBOSE, _("\
1891 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1893 free_hstat (&hstat);
1897 else if (tml >= tmr)
1898 logprintf (LOG_VERBOSE, _("\
1899 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1901 logputs (LOG_VERBOSE,
1902 _("Remote file is newer, retrieving.\n"));
1904 free_hstat (&hstat);
1907 if ((tmr != (time_t) (-1))
1909 && ((hstat.len == hstat.contlen) ||
1910 ((hstat.res == 0) &&
1911 ((hstat.contlen == -1) ||
1912 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1914 /* #### This code repeats in http.c and ftp.c. Move it to a
1916 const char *fl = NULL;
1917 if (opt.output_document)
1919 if (opt.od_known_regular)
1920 fl = opt.output_document;
1923 fl = *hstat.local_file;
1927 /* End of time-stamping section. */
1931 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1936 tmrate = retr_rate (hstat.len - hstat.restval, hstat.dltime, 0);
1938 if (hstat.len == hstat.contlen)
1942 logprintf (LOG_VERBOSE,
1943 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1944 tms, tmrate, locf, hstat.len, hstat.contlen);
1945 logprintf (LOG_NONVERBOSE,
1946 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1947 tms, u->url, hstat.len, hstat.contlen, locf, count);
1950 total_downloaded_bytes += hstat.len;
1952 /* Remember that we downloaded the file for later ".orig" code. */
1953 if (*dt & ADDED_HTML_EXTENSION)
1954 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1956 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1958 free_hstat (&hstat);
1962 else if (hstat.res == 0) /* No read error */
1964 if (hstat.contlen == -1) /* We don't know how much we were supposed
1965 to get, so assume we succeeded. */
1969 logprintf (LOG_VERBOSE,
1970 _("%s (%s) - `%s' saved [%ld]\n\n"),
1971 tms, tmrate, locf, hstat.len);
1972 logprintf (LOG_NONVERBOSE,
1973 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1974 tms, u->url, hstat.len, locf, count);
1977 total_downloaded_bytes += hstat.len;
1979 /* Remember that we downloaded the file for later ".orig" code. */
1980 if (*dt & ADDED_HTML_EXTENSION)
1981 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1983 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1985 free_hstat (&hstat);
1989 else if (hstat.len < hstat.contlen) /* meaning we lost the
1990 connection too soon */
1992 logprintf (LOG_VERBOSE,
1993 _("%s (%s) - Connection closed at byte %ld. "),
1994 tms, tmrate, hstat.len);
1995 printwhat (count, opt.ntry);
1996 free_hstat (&hstat);
1999 else if (!opt.kill_longer) /* meaning we got more than expected */
2001 logprintf (LOG_VERBOSE,
2002 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
2003 tms, tmrate, locf, hstat.len, hstat.contlen);
2004 logprintf (LOG_NONVERBOSE,
2005 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
2006 tms, u->url, hstat.len, hstat.contlen, locf, count);
2008 total_downloaded_bytes += hstat.len;
2010 /* Remember that we downloaded the file for later ".orig" code. */
2011 if (*dt & ADDED_HTML_EXTENSION)
2012 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2014 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2016 free_hstat (&hstat);
2020 else /* the same, but not accepted */
2022 logprintf (LOG_VERBOSE,
2023 _("%s (%s) - Connection closed at byte %ld/%ld. "),
2024 tms, tmrate, hstat.len, hstat.contlen);
2025 printwhat (count, opt.ntry);
2026 free_hstat (&hstat);
2030 else /* now hstat.res can only be -1 */
2032 if (hstat.contlen == -1)
2034 logprintf (LOG_VERBOSE,
2035 _("%s (%s) - Read error at byte %ld (%s)."),
2036 tms, tmrate, hstat.len, strerror (errno));
2037 printwhat (count, opt.ntry);
2038 free_hstat (&hstat);
2041 else /* hstat.res == -1 and contlen is given */
2043 logprintf (LOG_VERBOSE,
2044 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
2045 tms, tmrate, hstat.len, hstat.contlen,
2047 printwhat (count, opt.ntry);
2048 free_hstat (&hstat);
2055 while (!opt.ntry || (count < opt.ntry));
2059 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
2060 than local timezone.
2062 mktime is similar but assumes struct tm, also known as the
2063 "broken-down" form of time, is in local time zone. mktime_from_utc
2064 uses mktime to make the conversion understanding that an offset
2065 will be introduced by the local time assumption.
2067 mktime_from_utc then measures the introduced offset by applying
2068 gmtime to the initial result and applying mktime to the resulting
2069 "broken-down" form. The difference between the two mktime results
2070 is the measured offset which is then subtracted from the initial
2071 mktime result to yield a calendar time which is the value returned.
2073 tm_isdst in struct tm is set to 0 to force mktime to introduce a
2074 consistent offset (the non DST offset) since tm and tm+o might be
2075 on opposite sides of a DST change.
2077 Some implementations of mktime return -1 for the nonexistent
2078 localtime hour at the beginning of DST. In this event, use
2079 mktime(tm - 1hr) + 3600.
2083 gmtime(t+o) --> tm+o
2084 mktime(tm+o) --> t+2o
2085 t+o - (t+2o - t+o) = t
2087 Note that glibc contains a function of the same purpose named
2088 `timegm' (reverse of gmtime). But obviously, it is not universally
2089 available, and unfortunately it is not straightforwardly
2090 extractable for use here. Perhaps configure should detect timegm
2091 and use it where available.
2093 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
2094 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
2095 Further improved by Roger with assistance from Edward J. Sabol
2096 based on input by Jamie Zawinski. */
2099 mktime_from_utc (struct tm *t)
2110 return -1; /* can't deal with output from strptime */
2121 return -1; /* can't deal with output from gmtime */
2124 return (tl - (tb - tl));
2127 /* Check whether the result of strptime() indicates success.
2128 strptime() returns the pointer to how far it got to in the string.
2129 The processing has been successful if the string is at `GMT' or
2130 `+X', or at the end of the string.
2132 In extended regexp parlance, the function returns 1 if P matches
2133 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2134 can return) is considered a failure and 0 is returned. */
2136 check_end (const char *p)
2140 while (ISSPACE (*p))
2143 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2144 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
2150 /* Convert the textual specification of time in TIME_STRING to the
2151 number of seconds since the Epoch.
2153 TIME_STRING can be in any of the three formats RFC2068 allows the
2154 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
2155 Timezones are ignored, and should be GMT.
2157 Return the computed time_t representation, or -1 if the conversion
2160 This function uses strptime with various string formats for parsing
2161 TIME_STRING. This results in a parser that is not as lenient in
2162 interpreting TIME_STRING as I would like it to be. Being based on
2163 strptime, it always allows shortened months, one-digit days, etc.,
2164 but due to the multitude of formats in which time can be
2165 represented, an ideal HTTP time parser would be even more
2166 forgiving. It should completely ignore things like week days and
2167 concentrate only on the various forms of representing years,
2168 months, days, hours, minutes, and seconds. For example, it would
2169 be nice if it accepted ISO 8601 out of the box.
2171 I've investigated free and PD code for this purpose, but none was
2172 usable. getdate was big and unwieldy, and had potential copyright
2173 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2174 distributed with phttpd, is excellent, but we cannot use it because
2175 it is not assigned to the FSF. So I stuck it with strptime. */
2178 http_atotm (const char *time_string)
2180 /* NOTE: Solaris strptime man page claims that %n and %t match white
2181 space, but that's not universally available. Instead, we simply
2182 use ` ' to mean "skip all WS", which works under all strptime
2183 implementations I've tested. */
2185 static const char *time_formats[] = {
2186 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
2187 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
2188 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
2189 (google.com uses this for their cookies.) */
2190 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2196 /* According to Roger Beeman, we need to initialize tm_isdst, since
2197 strptime won't do it. */
2200 /* Note that under foreign locales Solaris strptime() fails to
2201 recognize English dates, which renders this function useless. We
2202 solve this by being careful not to affect LC_TIME when
2203 initializing locale.
2205 Another solution would be to temporarily set locale to C, invoke
2206 strptime(), and restore it back. This is slow and dirty,
2207 however, and locale support other than LC_MESSAGES can mess other
2208 things, so I rather chose to stick with just setting LC_MESSAGES.
2210 GNU strptime does not have this problem because it recognizes
2211 both international and local dates. */
2213 for (i = 0; i < countof (time_formats); i++)
2214 if (check_end (strptime (time_string, time_formats[i], &t)))
2215 return mktime_from_utc (&t);
2217 /* All formats have failed. */
2221 /* Authorization support: We support two authorization schemes:
2223 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2225 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2226 consisting of answering to the server's challenge with the proper
2229 /* How many bytes it will take to store LEN bytes in base64. */
2230 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2232 /* Encode the string S of length LENGTH to base64 format and place it
2233 to STORE. STORE will be 0-terminated, and must point to a writable
2234 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2236 base64_encode (const char *s, char *store, int length)
2238 /* Conversion table. */
2239 static char tbl[64] = {
2240 'A','B','C','D','E','F','G','H',
2241 'I','J','K','L','M','N','O','P',
2242 'Q','R','S','T','U','V','W','X',
2243 'Y','Z','a','b','c','d','e','f',
2244 'g','h','i','j','k','l','m','n',
2245 'o','p','q','r','s','t','u','v',
2246 'w','x','y','z','0','1','2','3',
2247 '4','5','6','7','8','9','+','/'
2250 unsigned char *p = (unsigned char *)store;
2252 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2253 for (i = 0; i < length; i += 3)
2255 *p++ = tbl[s[0] >> 2];
2256 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2257 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2258 *p++ = tbl[s[2] & 0x3f];
2261 /* Pad the result if necessary... */
2262 if (i == length + 1)
2264 else if (i == length + 2)
2265 *(p - 1) = *(p - 2) = '=';
2266 /* ...and zero-terminate it. */
2270 /* Create the authentication header contents for the `Basic' scheme.
2271 This is done by encoding the string `USER:PASS' in base64 and
2272 prepending `HEADER: Basic ' to it. */
2274 basic_authentication_encode (const char *user, const char *passwd,
2277 char *t1, *t2, *res;
2278 int len1 = strlen (user) + 1 + strlen (passwd);
2279 int len2 = BASE64_LENGTH (len1);
2281 t1 = (char *)alloca (len1 + 1);
2282 sprintf (t1, "%s:%s", user, passwd);
2283 t2 = (char *)alloca (1 + len2);
2284 base64_encode (t1, t2, len1);
2285 res = (char *)xmalloc (len2 + 11 + strlen (header));
2286 sprintf (res, "%s: Basic %s\r\n", header, t2);
2292 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2293 of a field in such a header. If the field is the one specified by
2294 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2295 digest authorization code), extract its value in the (char*)
2296 variable pointed by RET. Returns negative on a malformed header,
2297 or number of bytes that have been parsed by this call. */
2299 extract_header_attr (const char *au, const char *attr_name, char **ret)
2301 const char *cp, *ep;
2305 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2307 cp += strlen (attr_name);
2310 cp += skip_lws (cp);
2315 cp += skip_lws (cp);
2320 for (ep = cp; *ep && *ep != '\"'; ep++)
2325 *ret = strdupdelim (cp, ep);
2332 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2333 an array of 16 bytes containing the hash keys, and BUF should be a
2334 buffer of 33 writable characters (32 for hex digits plus one for
2335 zero termination). */
2337 dump_hash (unsigned char *buf, const unsigned char *hash)
2341 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2343 *buf++ = XNUM_TO_digit (*hash >> 4);
2344 *buf++ = XNUM_TO_digit (*hash & 0xf);
2349 /* Take the line apart to find the challenge, and compose a digest
2350 authorization header. See RFC2069 section 2.1.2. */
2352 digest_authentication_encode (const char *au, const char *user,
2353 const char *passwd, const char *method,
2356 static char *realm, *opaque, *nonce;
2361 { "realm", &realm },
2362 { "opaque", &opaque },
2367 realm = opaque = nonce = NULL;
2369 au += 6; /* skip over `Digest' */
2374 au += skip_lws (au);
2375 for (i = 0; i < countof (options); i++)
2377 int skip = extract_header_attr (au, options[i].name,
2378 options[i].variable);
2382 xfree_null (opaque);
2392 if (i == countof (options))
2394 while (*au && *au != '=')
2398 au += skip_lws (au);
2402 while (*au && *au != '\"')
2409 while (*au && *au != ',')
2414 if (!realm || !nonce || !user || !passwd || !path || !method)
2417 xfree_null (opaque);
2422 /* Calculate the digest value. */
2424 ALLOCA_MD5_CONTEXT (ctx);
2425 unsigned char hash[MD5_HASHLEN];
2426 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2427 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2429 /* A1BUF = H(user ":" realm ":" password) */
2431 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2432 gen_md5_update ((unsigned char *)":", 1, ctx);
2433 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2434 gen_md5_update ((unsigned char *)":", 1, ctx);
2435 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2436 gen_md5_finish (ctx, hash);
2437 dump_hash (a1buf, hash);
2439 /* A2BUF = H(method ":" path) */
2441 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2442 gen_md5_update ((unsigned char *)":", 1, ctx);
2443 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2444 gen_md5_finish (ctx, hash);
2445 dump_hash (a2buf, hash);
2447 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2449 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2450 gen_md5_update ((unsigned char *)":", 1, ctx);
2451 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2452 gen_md5_update ((unsigned char *)":", 1, ctx);
2453 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2454 gen_md5_finish (ctx, hash);
2455 dump_hash (response_digest, hash);
2457 res = (char*) xmalloc (strlen (user)
2462 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2463 + (opaque ? strlen (opaque) : 0)
2465 sprintf (res, "Authorization: Digest \
2466 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2467 user, realm, nonce, path, response_digest);
2470 char *p = res + strlen (res);
2471 strcat (p, ", opaque=\"");
2475 strcat (res, "\r\n");
2479 #endif /* USE_DIGEST */
2482 #define BEGINS_WITH(line, string_constant) \
2483 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2484 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2485 || !line[sizeof (string_constant) - 1]))
2488 known_authentication_scheme_p (const char *au)
2490 return BEGINS_WITH (au, "Basic")
2491 || BEGINS_WITH (au, "Digest")
2492 || BEGINS_WITH (au, "NTLM");
2497 /* Create the HTTP authorization request header. When the
2498 `WWW-Authenticate' response header is seen, according to the
2499 authorization scheme specified in that header (`Basic' and `Digest'
2500 are supported by the current implementation), produce an
2501 appropriate HTTP authorization request header. */
2503 create_authorization_line (const char *au, const char *user,
2504 const char *passwd, const char *method,
2507 char *wwwauth = NULL;
2509 if (!strncasecmp (au, "Basic", 5))
2510 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2511 if (!strncasecmp (au, "NTLM", 4))
2512 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2514 else if (!strncasecmp (au, "Digest", 6))
2515 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2516 #endif /* USE_DIGEST */
2523 if (pc_last_host_ip)
2524 address_list_release (pc_last_host_ip);