2 Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001
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. */
25 #include <sys/types.h>
36 #if TIME_WITH_SYS_TIME
37 # include <sys/time.h>
41 # include <sys/time.h>
58 # include "gen_sslfunc.h"
65 extern char *version_string;
71 static int cookies_loaded_p;
73 #define TEXTHTML_S "text/html"
74 #define HTTP_ACCEPT "*/*"
76 /* Some status code validation macros: */
77 #define H_20X(x) (((x) >= 200) && ((x) < 300))
78 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
79 #define H_REDIRECTED(x) (((x) == HTTP_STATUS_MOVED_PERMANENTLY) \
80 || ((x) == HTTP_STATUS_MOVED_TEMPORARILY))
82 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
84 #define HTTP_STATUS_OK 200
85 #define HTTP_STATUS_CREATED 201
86 #define HTTP_STATUS_ACCEPTED 202
87 #define HTTP_STATUS_NO_CONTENT 204
88 #define HTTP_STATUS_PARTIAL_CONTENTS 206
90 /* Redirection 3xx. */
91 #define HTTP_STATUS_MULTIPLE_CHOICES 300
92 #define HTTP_STATUS_MOVED_PERMANENTLY 301
93 #define HTTP_STATUS_MOVED_TEMPORARILY 302
94 #define HTTP_STATUS_NOT_MODIFIED 304
96 /* Client error 4xx. */
97 #define HTTP_STATUS_BAD_REQUEST 400
98 #define HTTP_STATUS_UNAUTHORIZED 401
99 #define HTTP_STATUS_FORBIDDEN 403
100 #define HTTP_STATUS_NOT_FOUND 404
102 /* Server errors 5xx. */
103 #define HTTP_STATUS_INTERNAL 500
104 #define HTTP_STATUS_NOT_IMPLEMENTED 501
105 #define HTTP_STATUS_BAD_GATEWAY 502
106 #define HTTP_STATUS_UNAVAILABLE 503
109 /* Parse the HTTP status line, which is of format:
111 HTTP-Version SP Status-Code SP Reason-Phrase
113 The function returns the status-code, or -1 if the status line is
114 malformed. The pointer to reason-phrase is returned in RP. */
116 parse_http_status_line (const char *line, const char **reason_phrase_ptr)
118 /* (the variables must not be named `major' and `minor', because
119 that breaks compilation with SunOS4 cc.) */
120 int mjr, mnr, statcode;
123 *reason_phrase_ptr = NULL;
125 /* The standard format of HTTP-Version is: `HTTP/X.Y', where X is
126 major version, and Y is minor version. */
127 if (strncmp (line, "HTTP/", 5) != 0)
131 /* Calculate major HTTP version. */
133 for (mjr = 0; ISDIGIT (*line); line++)
134 mjr = 10 * mjr + (*line - '0');
135 if (*line != '.' || p == line)
139 /* Calculate minor HTTP version. */
141 for (mnr = 0; ISDIGIT (*line); line++)
142 mnr = 10 * mnr + (*line - '0');
143 if (*line != ' ' || p == line)
145 /* Wget will accept only 1.0 and higher HTTP-versions. The value of
146 minor version can be safely ignored. */
151 /* Calculate status code. */
152 if (!(ISDIGIT (*line) && ISDIGIT (line[1]) && ISDIGIT (line[2])))
154 statcode = 100 * (*line - '0') + 10 * (line[1] - '0') + (line[2] - '0');
156 /* Set up the reason phrase pointer. */
158 /* RFC2068 requires SPC here, but we allow the string to finish
159 here, in case no reason-phrase is present. */
163 *reason_phrase_ptr = line;
168 *reason_phrase_ptr = line + 1;
173 /* Functions to be used as arguments to header_process(): */
175 struct http_process_range_closure {
181 /* Parse the `Content-Range' header and extract the information it
182 contains. Returns 1 if successful, -1 otherwise. */
184 http_process_range (const char *hdr, void *arg)
186 struct http_process_range_closure *closure
187 = (struct http_process_range_closure *)arg;
190 /* Certain versions of Nutscape proxy server send out
191 `Content-Length' without "bytes" specifier, which is a breach of
192 RFC2068 (as well as the HTTP/1.1 draft which was current at the
193 time). But hell, I must support it... */
194 if (!strncasecmp (hdr, "bytes", 5))
197 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
201 hdr += skip_lws (hdr);
207 for (num = 0; ISDIGIT (*hdr); hdr++)
208 num = 10 * num + (*hdr - '0');
209 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
211 closure->first_byte_pos = num;
213 for (num = 0; ISDIGIT (*hdr); hdr++)
214 num = 10 * num + (*hdr - '0');
215 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
217 closure->last_byte_pos = num;
219 for (num = 0; ISDIGIT (*hdr); hdr++)
220 num = 10 * num + (*hdr - '0');
221 closure->entity_length = num;
225 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
226 Used for `Accept-Ranges'. */
228 http_process_none (const char *hdr, void *arg)
230 int *where = (int *)arg;
232 if (strstr (hdr, "none"))
239 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
241 http_process_type (const char *hdr, void *arg)
243 char **result = (char **)arg;
244 /* Locate P on `;' or the terminating zero, whichever comes first. */
245 const char *p = strchr (hdr, ';');
247 p = hdr + strlen (hdr);
248 while (p > hdr && ISSPACE (*(p - 1)))
250 *result = strdupdelim (hdr, p);
254 /* Check whether the `Connection' header is set to "keep-alive". */
256 http_process_connection (const char *hdr, void *arg)
258 int *flag = (int *)arg;
259 if (!strcasecmp (hdr, "Keep-Alive"))
264 /* Persistent connections. Currently, we cache the most recently used
265 connection as persistent, provided that the HTTP server agrees to
266 make it such. The persistence data is stored in the variables
267 below. Ideally, it would be in a structure, and it should be
268 possible to cache an arbitrary fixed number of these connections.
270 I think the code is quite easy to extend in that direction. */
272 /* Whether a persistent connection is active. */
273 static int pc_active_p;
274 /* Host and port of currently active persistent connection. */
275 static struct address_list *pc_last_host_ip;
276 static unsigned short pc_last_port;
278 /* File descriptor of the currently active persistent connection. */
279 static int pc_last_fd;
282 /* Whether a ssl handshake has occoured on this connection */
283 static int pc_active_ssl;
284 /* SSL connection of the currently active persistent connection. */
285 static SSL *pc_last_ssl;
286 #endif /* HAVE_SSL */
288 /* Mark the persistent connection as invalid. This is used by the
289 CLOSE_* macros after they forcefully close a registered persistent
290 connection. This does not close the file descriptor -- it is left
291 to the caller to do that. (Maybe it should, though.) */
294 invalidate_persistent (void)
299 #endif /* HAVE_SSL */
300 if (pc_last_host_ip != NULL)
302 address_list_release (pc_last_host_ip);
303 pc_last_host_ip = NULL;
305 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
308 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
309 persistent. This will enable someone to use the same connection
310 later. In the context of HTTP, this must be called only AFTER the
311 response has been received and the server has promised that the
312 connection will remain alive.
314 If a previous connection was persistent, it is closed. */
317 register_persistent (const char *host, unsigned short port, int fd
325 if (pc_last_fd == fd)
327 /* The connection FD is already registered. Nothing to
333 /* The old persistent connection is still active; let's
334 close it first. This situation arises whenever a
335 persistent connection exists, but we then connect to a
336 different host, and try to register a persistent
337 connection to that one. */
339 /* The ssl disconnect has to take place before the closing
342 shutdown_ssl(pc_last_ssl);
345 invalidate_persistent ();
349 assert (pc_last_host_ip == NULL);
351 /* This lookup_host cannot fail, because it has the results in the
353 pc_last_host_ip = lookup_host (host, 1);
354 assert (pc_last_host_ip != NULL);
361 pc_active_ssl = ssl ? 1 : 0;
363 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
367 # define SHUTDOWN_SSL(ssl) do { \
369 shutdown_ssl (ssl); \
372 # define SHUTDOWN_SSL(ssl)
375 /* Return non-zero if a persistent connection is available for
376 connecting to HOST:PORT. */
379 persistent_available_p (const char *host, unsigned short port
386 struct address_list *this_host_ip;
388 /* First, check whether a persistent connection is active at all. */
391 /* Second, check if the active connection pertains to the correct
392 (HOST, PORT) ordered pair. */
393 if (port != pc_last_port)
397 /* Second, a): check if current connection is (not) ssl, too. This
398 test is unlikely to fail because HTTP and HTTPS typicaly use
399 different ports. Yet it is possible, or so I [Christian
400 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
402 if (ssl != pc_active_ssl)
404 #endif /* HAVE_SSL */
406 this_host_ip = lookup_host (host, 1);
410 /* To equate the two host names for the purposes of persistent
411 connections, they need to share all the IP addresses in the
413 success = address_list_match_all (pc_last_host_ip, this_host_ip);
414 address_list_release (this_host_ip);
418 /* Third: check whether the connection is still open. This is
419 important because most server implement a liberal (short) timeout
420 on persistent connections. Wget can of course always reconnect
421 if the connection doesn't work out, but it's nicer to know in
422 advance. This test is a logical followup of the first test, but
423 is "expensive" and therefore placed at the end of the list. */
424 if (!test_socket_open (pc_last_fd))
426 /* Oops, the socket is no longer open. Now that we know that,
427 let's invalidate the persistent connection before returning
431 SHUTDOWN_SSL (pc_last_ssl);
434 invalidate_persistent ();
440 /* The idea behind these two CLOSE macros is to distinguish between
441 two cases: one when the job we've been doing is finished, and we
442 want to close the connection and leave, and two when something is
443 seriously wrong and we're closing the connection as part of
446 In case of keep_alive, CLOSE_FINISH should leave the connection
447 open, while CLOSE_INVALIDATE should still close it.
449 Note that the semantics of the flag `keep_alive' is "this
450 connection *will* be reused (the server has promised not to close
451 the connection once we're done)", while the semantics of
452 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
453 active, registered connection". */
455 #define CLOSE_FINISH(fd) do { \
458 SHUTDOWN_SSL (ssl); \
460 if (pc_active_p && (fd) == pc_last_fd) \
461 invalidate_persistent (); \
465 #define CLOSE_INVALIDATE(fd) do { \
466 SHUTDOWN_SSL (ssl); \
468 if (pc_active_p && (fd) == pc_last_fd) \
469 invalidate_persistent (); \
474 long len; /* received length */
475 long contlen; /* expected length */
476 long restval; /* the restart value */
477 int res; /* the result of last read */
478 char *newloc; /* new location (redirection) */
479 char *remote_time; /* remote time-stamp string */
480 char *error; /* textual HTTP error */
481 int statcode; /* status code */
482 long dltime; /* time of the download */
483 int no_truncate; /* whether truncating the file is
485 const char *referer; /* value of the referer header. */
486 char **local_file; /* local file. */
490 free_hstat (struct http_stat *hs)
492 FREE_MAYBE (hs->newloc);
493 FREE_MAYBE (hs->remote_time);
494 FREE_MAYBE (hs->error);
496 /* Guard against being called twice. */
498 hs->remote_time = NULL;
502 static char *create_authorization_line PARAMS ((const char *, const char *,
503 const char *, const char *,
505 static char *basic_authentication_encode PARAMS ((const char *, const char *,
507 static int known_authentication_scheme_p PARAMS ((const char *));
509 time_t http_atotm PARAMS ((char *));
511 #define BEGINS_WITH(line, string_constant) \
512 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
513 && (ISSPACE (line[sizeof (string_constant) - 1]) \
514 || !line[sizeof (string_constant) - 1]))
516 /* Retrieve a document through HTTP protocol. It recognizes status
517 code, and correctly handles redirections. It closes the network
518 socket. If it receives an error from the functions below it, it
519 will print it if there is enough information to do so (almost
520 always), returning the error to the caller (i.e. http_loop).
522 Various HTTP parameters are stored to hs. Although it parses the
523 response code correctly, it is not used in a sane way. The caller
526 If PROXY is non-NULL, the connection will be made to the proxy
527 server, and u->url will be requested. */
529 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
531 char *request, *type, *command, *full_path;
533 char *pragma_h, *referer, *useragent, *range, *wwwauth;
534 char *authenticate_h;
538 char *request_keep_alive;
539 int sock, hcount, num_written, all_length, statcode;
540 long contlen, contrange;
543 int auth_tried_already;
546 static SSL_CTX *ssl_ctx = NULL;
548 #endif /* HAVE_SSL */
549 char *cookies = NULL;
551 /* Whether this connection will be kept alive after the HTTP request
555 /* Flags that detect the two ways of specifying HTTP keep-alive
557 int http_keep_alive_1, http_keep_alive_2;
559 /* Whether keep-alive should be inhibited. */
560 int inhibit_keep_alive;
563 /* initialize ssl_ctx on first run */
566 uerr_t err = init_ssl (&ssl_ctx);
571 case SSLERRCTXCREATE:
573 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
577 /* try without certfile */
578 logprintf (LOG_NOTQUIET,
579 _("Failed to load certificates from %s\n"),
582 logprintf (LOG_NOTQUIET,
583 _("Trying without the specified certificate\n"));
586 logprintf (LOG_NOTQUIET,
587 _("Failed to get certificate key from %s\n"),
590 logprintf (LOG_NOTQUIET,
591 _("Trying without the specified certificate\n"));
598 #endif /* HAVE_SSL */
600 if (!(*dt & HEAD_ONLY))
601 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
602 know the local filename so we can save to it. */
603 assert (*hs->local_file != NULL);
606 auth_tried_already = 0;
608 inhibit_keep_alive = !opt.http_keep_alive || proxy != NULL;
611 /* We need to come back here when the initial attempt to retrieve
612 without authorization header fails. (Expected to happen at least
613 for the Digest authorization scheme.) */
616 http_keep_alive_1 = http_keep_alive_2 = 0;
618 /* Initialize certain elements of struct http_stat. */
623 hs->remote_time = NULL;
626 /* If we're using a proxy, we will be connecting to the proxy
628 conn = proxy ? proxy : u;
630 /* First: establish the connection. */
631 if (inhibit_keep_alive
634 !persistent_available_p (conn->host, conn->port)
636 !persistent_available_p (conn->host, conn->port,
637 u->scheme == SCHEME_HTTPS)
638 #endif /* HAVE_SSL */
641 struct address_list *al = lookup_host (conn->host, 0);
644 set_connection_host_name (conn->host);
645 sock = connect_to_many (al, conn->port, 0);
646 set_connection_host_name (NULL);
647 address_list_release (al);
650 return errno == ECONNREFUSED ? CONREFUSED : CONERROR;
653 if (conn->scheme == SCHEME_HTTPS)
654 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
656 logputs (LOG_VERBOSE, "\n");
657 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
662 #endif /* HAVE_SSL */
666 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"),
667 conn->host, conn->port);
668 /* #### pc_last_fd should be accessed through an accessor
673 #endif /* HAVE_SSL */
674 DEBUGP (("Reusing fd %d.\n", sock));
677 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
682 referer = (char *)alloca (9 + strlen (hs->referer) + 3);
683 sprintf (referer, "Referer: %s\r\n", hs->referer);
686 if (*dt & SEND_NOCACHE)
687 pragma_h = "Pragma: no-cache\r\n";
693 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
694 /* Gag me! Some servers (e.g. WebSitePro) have been known to
695 respond to the following `Range' format by generating a
696 multipart/x-byte-ranges MIME document! This MIME type was
697 present in an old draft of the byteranges specification.
698 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
699 only if multiple non-overlapping ranges are requested --
700 which Wget never does. */
701 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
706 STRDUP_ALLOCA (useragent, opt.useragent);
709 useragent = (char *)alloca (10 + strlen (version_string));
710 sprintf (useragent, "Wget/%s", version_string);
712 /* Construct the authentication, if userid is present. */
715 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
716 user = user ? user : opt.http_user;
717 passwd = passwd ? passwd : opt.http_passwd;
724 /* We have the username and the password, but haven't tried
725 any authorization yet. Let's see if the "Basic" method
726 works. If not, we'll come back here and construct a
727 proper authorization method with the right challenges.
729 If we didn't employ this kind of logic, every URL that
730 requires authorization would have to be processed twice,
731 which is very suboptimal and generates a bunch of false
732 "unauthorized" errors in the server log.
734 #### But this logic also has a serious problem when used
735 with stronger authentications: we *first* transmit the
736 username and the password in clear text, and *then*
737 attempt a stronger authentication scheme. That cannot be
738 right! We are only fortunate that almost everyone still
739 uses the `Basic' scheme anyway.
741 There should be an option to prevent this from happening,
742 for those who use strong authentication schemes and value
744 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
748 /* Use the full path, i.e. one that includes the leading
749 slash and the query string, but is independent of proxy
751 char *pth = url_full_path (u);
752 wwwauth = create_authorization_line (authenticate_h, user, passwd,
761 char *proxy_user, *proxy_passwd;
762 /* For normal username and password, URL components override
763 command-line/wgetrc parameters. With proxy authentication,
764 it's the reverse, because proxy URLs are normally the
765 "permanent" ones, so command-line args should take
767 if (opt.proxy_user && opt.proxy_passwd)
769 proxy_user = opt.proxy_user;
770 proxy_passwd = opt.proxy_passwd;
774 proxy_user = proxy->user;
775 proxy_passwd = proxy->passwd;
777 /* #### This does not appear right. Can't the proxy request,
778 say, `Digest' authentication? */
779 if (proxy_user && proxy_passwd)
780 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
781 "Proxy-Authorization");
784 /* String of the form :PORT. Used only for non-standard ports. */
786 if (u->port != scheme_default_port (u->scheme))
788 port_maybe = (char *)alloca (numdigit (u->port) + 2);
789 sprintf (port_maybe, ":%d", u->port);
792 if (!inhibit_keep_alive)
793 request_keep_alive = "Connection: Keep-Alive\r\n";
795 request_keep_alive = NULL;
798 cookies = build_cookies_request (u->host, u->port, u->path,
800 u->scheme == SCHEME_HTTPS
807 full_path = xstrdup (u->url);
809 /* Use the full path, i.e. one that includes the leading slash and
810 the query string. E.g. if u->path is "foo/bar" and u->query is
811 "param=value", full_path will be "/foo/bar?param=value". */
812 full_path = url_full_path (u);
814 /* Allocate the memory for the request. */
815 request = (char *)alloca (strlen (command)
819 + (port_maybe ? strlen (port_maybe) : 0)
820 + strlen (HTTP_ACCEPT)
821 + (request_keep_alive
822 ? strlen (request_keep_alive) : 0)
823 + (referer ? strlen (referer) : 0)
824 + (cookies ? strlen (cookies) : 0)
825 + (wwwauth ? strlen (wwwauth) : 0)
826 + (proxyauth ? strlen (proxyauth) : 0)
827 + (range ? strlen (range) : 0)
829 + (opt.user_header ? strlen (opt.user_header) : 0)
831 /* Construct the request. */
837 %s%s%s%s%s%s%s%s\r\n",
840 port_maybe ? port_maybe : "",
842 request_keep_alive ? request_keep_alive : "",
843 referer ? referer : "",
844 cookies ? cookies : "",
845 wwwauth ? wwwauth : "",
846 proxyauth ? proxyauth : "",
849 opt.user_header ? opt.user_header : "");
850 DEBUGP (("---request begin---\n%s---request end---\n", request));
852 /* Free the temporary memory. */
853 FREE_MAYBE (wwwauth);
854 FREE_MAYBE (proxyauth);
855 FREE_MAYBE (cookies);
858 /* Send the request to server. */
860 if (conn->scheme == SCHEME_HTTPS)
861 num_written = ssl_iwrite (ssl, request, strlen (request));
863 #endif /* HAVE_SSL */
864 num_written = iwrite (sock, request, strlen (request));
868 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
870 CLOSE_INVALIDATE (sock);
873 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
874 proxy ? "Proxy" : "HTTP");
875 contlen = contrange = -1;
880 /* Before reading anything, initialize the rbuf. */
881 rbuf_initialize (&rbuf, sock);
883 if (conn->scheme == SCHEME_HTTPS)
887 #endif /* HAVE_SSL */
890 /* Header-fetching loop. */
898 /* Get the header. */
899 status = header_get (&rbuf, &hdr,
900 /* Disallow continuations for status line. */
901 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
903 /* Check for errors. */
904 if (status == HG_EOF && *hdr)
906 /* This used to be an unconditional error, but that was
907 somewhat controversial, because of a large number of
908 broken CGI's that happily "forget" to send the second EOL
909 before closing the connection of a HEAD request.
911 So, the deal is to check whether the header is empty
912 (*hdr is zero if it is); if yes, it means that the
913 previous header was fully retrieved, and that -- most
914 probably -- the request is complete. "...be liberal in
915 what you accept." Oh boy. */
916 logputs (LOG_VERBOSE, "\n");
917 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
920 FREE_MAYBE (all_headers);
921 CLOSE_INVALIDATE (sock);
924 else if (status == HG_ERROR)
926 logputs (LOG_VERBOSE, "\n");
927 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
931 FREE_MAYBE (all_headers);
932 CLOSE_INVALIDATE (sock);
936 /* If the headers are to be saved to a file later, save them to
938 if (opt.save_headers)
940 int lh = strlen (hdr);
941 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
942 memcpy (all_headers + all_length, hdr, lh);
944 all_headers[all_length++] = '\n';
945 all_headers[all_length] = '\0';
948 /* Check for status line. */
952 /* Parse the first line of server response. */
953 statcode = parse_http_status_line (hdr, &error);
954 hs->statcode = statcode;
955 /* Store the descriptive response. */
956 if (statcode == -1) /* malformed response */
958 /* A common reason for "malformed response" error is the
959 case when no data was actually received. Handle this
962 hs->error = xstrdup (_("No data received"));
964 hs->error = xstrdup (_("Malformed status line"));
969 hs->error = xstrdup (_("(no description)"));
971 hs->error = xstrdup (error);
979 if (opt.server_response)
980 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
982 logprintf (LOG_VERBOSE, "%2d %s", statcode, error);
988 /* Exit on empty header. */
995 /* Print the header if requested. */
996 if (opt.server_response && hcount != 1)
997 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
999 /* Try getting content-length. */
1000 if (contlen == -1 && !opt.ignore_length)
1001 if (header_process (hdr, "Content-Length", header_extract_number,
1004 /* Try getting content-type. */
1006 if (header_process (hdr, "Content-Type", http_process_type, &type))
1008 /* Try getting location. */
1010 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1012 /* Try getting last-modified. */
1013 if (!hs->remote_time)
1014 if (header_process (hdr, "Last-Modified", header_strdup,
1017 /* Try getting cookies. */
1019 if (header_process (hdr, "Set-Cookie", set_cookie_header_cb, u))
1021 /* Try getting www-authentication. */
1022 if (!authenticate_h)
1023 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1026 /* Check for accept-ranges header. If it contains the word
1027 `none', disable the ranges. */
1028 if (*dt & ACCEPTRANGES)
1031 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1034 *dt &= ~ACCEPTRANGES;
1038 /* Try getting content-range. */
1039 if (contrange == -1)
1041 struct http_process_range_closure closure;
1042 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1044 contrange = closure.first_byte_pos;
1048 /* Check for keep-alive related responses. */
1049 if (!inhibit_keep_alive)
1051 /* Check for the `Keep-Alive' header. */
1052 if (!http_keep_alive_1)
1054 if (header_process (hdr, "Keep-Alive", header_exists,
1055 &http_keep_alive_1))
1058 /* Check for `Connection: Keep-Alive'. */
1059 if (!http_keep_alive_2)
1061 if (header_process (hdr, "Connection", http_process_connection,
1062 &http_keep_alive_2))
1070 logputs (LOG_VERBOSE, "\n");
1073 && (http_keep_alive_1 || http_keep_alive_2))
1075 assert (inhibit_keep_alive == 0);
1079 /* The server has promised that it will not close the connection
1080 when we're done. This means that we can register it. */
1082 register_persistent (conn->host, conn->port, sock);
1084 register_persistent (conn->host, conn->port, sock, ssl);
1085 #endif /* HAVE_SSL */
1087 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1090 /* Authorization is required. */
1094 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1095 might be more bytes in the body. */
1096 if (auth_tried_already)
1098 /* If we have tried it already, then there is not point
1101 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1102 xfree (authenticate_h);
1105 else if (!known_authentication_scheme_p (authenticate_h))
1107 xfree (authenticate_h);
1108 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1111 else if (BEGINS_WITH (authenticate_h, "Basic"))
1113 /* The authentication scheme is basic, the one we try by
1114 default, and it failed. There's no sense in trying
1120 auth_tried_already = 1;
1124 /* We do not need this anymore. */
1127 xfree (authenticate_h);
1128 authenticate_h = NULL;
1131 /* 20x responses are counted among successful by default. */
1132 if (H_20X (statcode))
1135 /* Return if redirected. */
1136 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1138 /* RFC2068 says that in case of the 300 (multiple choices)
1139 response, the server can output a preferred URL through
1140 `Location' header; otherwise, the request should be treated
1141 like GET. So, if the location is set, it will be a
1142 redirection; otherwise, just proceed normally. */
1143 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1147 logprintf (LOG_VERBOSE,
1148 _("Location: %s%s\n"),
1149 hs->newloc ? hs->newloc : _("unspecified"),
1150 hs->newloc ? _(" [following]") : "");
1151 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1152 might be more bytes in the body. */
1154 FREE_MAYBE (all_headers);
1159 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
1162 /* We don't assume text/html by default. */
1165 if (opt.html_extension && (*dt & TEXTHTML))
1166 /* -E / --html-extension / html_extension = on was specified, and this is a
1167 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1168 already the file's suffix, tack on ".html". */
1170 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1172 if (last_period_in_local_filename == NULL ||
1173 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
1174 strcasecmp(last_period_in_local_filename, ".html") == EQ))
1176 size_t local_filename_len = strlen(*hs->local_file);
1178 *hs->local_file = xrealloc(*hs->local_file,
1179 local_filename_len + sizeof(".html"));
1180 strcpy(*hs->local_file + local_filename_len, ".html");
1182 *dt |= ADDED_HTML_EXTENSION;
1186 if (contrange == -1)
1188 /* We did not get a content-range header. This means that the
1189 server did not honor our `Range' request. Normally, this
1190 means we should reset hs->restval and continue normally. */
1192 /* However, if `-c' is used, we need to be a bit more careful:
1194 1. If `-c' is specified and the file already existed when
1195 Wget was started, it would be a bad idea for us to start
1196 downloading it from scratch, effectively truncating it. I
1197 believe this cannot happen unless `-c' was specified.
1199 2. If `-c' is used on a file that is already fully
1200 downloaded, we're requesting bytes after the end of file,
1201 which can result in server not honoring `Range'. If this is
1202 the case, `Content-Length' will be equal to the length of the
1204 if (opt.always_rest)
1206 /* Check for condition #2. */
1207 if (hs->restval > 0 /* restart was requested. */
1208 && contlen != -1 /* we got content-length. */
1209 && hs->restval >= contlen /* file fully downloaded
1213 logputs (LOG_VERBOSE, _("\
1214 \n The file is already fully retrieved; nothing to do.\n\n"));
1215 /* In case the caller inspects. */
1219 FREE_MAYBE (all_headers);
1220 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1221 might be more bytes in the body. */
1222 return RETRUNNEEDED;
1225 /* Check for condition #1. */
1226 if (hs->no_truncate)
1228 logprintf (LOG_NOTQUIET,
1231 Continued download failed on this file, which conflicts with `-c'.\n\
1232 Refusing to truncate existing file `%s'.\n\n"), *hs->local_file);
1234 FREE_MAYBE (all_headers);
1235 CLOSE_INVALIDATE (sock);
1236 return CONTNOTSUPPORTED;
1244 else if (contrange != hs->restval ||
1245 (H_PARTIAL (statcode) && contrange == -1))
1247 /* This means the whole request was somehow misunderstood by the
1248 server. Bail out. */
1250 FREE_MAYBE (all_headers);
1251 CLOSE_INVALIDATE (sock);
1258 contlen += contrange;
1260 contrange = -1; /* If conent-length was not sent,
1261 content-range will be ignored. */
1263 hs->contlen = contlen;
1267 if ((*dt & RETROKF) && !opt.server_response)
1269 /* No need to print this output if the body won't be
1270 downloaded at all, or if the original server response is
1272 logputs (LOG_VERBOSE, _("Length: "));
1275 logputs (LOG_VERBOSE, legible (contlen));
1276 if (contrange != -1)
1277 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1278 legible (contlen - contrange));
1281 logputs (LOG_VERBOSE,
1282 opt.ignore_length ? _("ignored") : _("unspecified"));
1284 logprintf (LOG_VERBOSE, " [%s]\n", type);
1286 logputs (LOG_VERBOSE, "\n");
1290 type = NULL; /* We don't need it any more. */
1292 /* Return if we have no intention of further downloading. */
1293 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1295 /* In case the caller cares to look... */
1299 FREE_MAYBE (all_headers);
1300 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1301 might be more bytes in the body. */
1302 return RETRFINISHED;
1305 /* Open the local file. */
1308 mkalldirs (*hs->local_file);
1310 rotate_backups (*hs->local_file);
1311 fp = fopen (*hs->local_file, hs->restval ? "ab" : "wb");
1314 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1315 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1316 might be more bytes in the body. */
1317 FREE_MAYBE (all_headers);
1323 extern int global_download_count;
1325 /* To ensure that repeated "from scratch" downloads work for -O
1326 files, we rewind the file pointer, unless restval is
1327 non-zero. (This works only when -O is used on regular files,
1328 but it's still a valuable feature.)
1330 However, this loses when more than one URL is specified on
1331 the command line the second rewinds eradicates the contents
1332 of the first download. Thus we disable the above trick for
1333 all the downloads except the very first one.
1335 #### A possible solution to this would be to remember the
1336 file position in the output document and to seek to that
1337 position, instead of rewinding. */
1338 if (!hs->restval && global_download_count == 0)
1340 /* This will silently fail for streams that don't correspond
1341 to regular files, but that's OK. */
1343 /* ftruncate is needed because opt.dfp is opened in append
1344 mode if opt.always_rest is set. */
1345 ftruncate (fileno (fp), 0);
1350 /* #### This confuses the code that checks for file size. There
1351 should be some overhead information. */
1352 if (opt.save_headers)
1353 fwrite (all_headers, 1, all_length, fp);
1355 /* Get the contents of the document. */
1356 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1357 (contlen != -1 ? contlen : 0),
1358 &rbuf, keep_alive, &hs->dltime);
1361 /* Close or flush the file. We have to be careful to check for
1362 error here. Checking the result of fwrite() is not enough --
1363 errors could go unnoticed! */
1366 flush_res = fclose (fp);
1368 flush_res = fflush (fp);
1369 if (flush_res == EOF)
1372 FREE_MAYBE (all_headers);
1373 CLOSE_FINISH (sock);
1376 return RETRFINISHED;
1379 /* The genuine HTTP loop! This is the part where the retrieval is
1380 retried, and retried, and retried, and... */
1382 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1383 int *dt, struct url *proxy)
1386 int use_ts, got_head = 0; /* time-stamping info */
1387 char *filename_plus_orig_suffix;
1388 char *local_filename = NULL;
1389 char *tms, *suf, *locf, *tmrate;
1391 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1392 long local_size = 0; /* the size of the local file */
1393 size_t filename_len;
1394 struct http_stat hstat; /* HTTP status */
1398 /* This used to be done in main(), but it's a better idea to do it
1399 here so that we don't go through the hoops if we're just using
1401 if (opt.cookies && opt.cookies_input && !cookies_loaded_p)
1403 load_cookies (opt.cookies_input);
1404 cookies_loaded_p = 1;
1409 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1410 has_wildcards_p because it would also warn on `?', and we know that
1411 shows up in CGI paths a *lot*. */
1412 if (strchr (u->url, '*'))
1413 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1415 /* Determine the local filename. */
1416 if (local_file && *local_file)
1417 hstat.local_file = local_file;
1418 else if (local_file)
1420 *local_file = url_filename (u);
1421 hstat.local_file = local_file;
1425 dummy = url_filename (u);
1426 hstat.local_file = &dummy;
1429 if (!opt.output_document)
1430 locf = *hstat.local_file;
1432 locf = opt.output_document;
1434 hstat.referer = referer;
1436 filename_len = strlen (*hstat.local_file);
1437 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1439 if (opt.noclobber && file_exists_p (*hstat.local_file))
1441 /* If opt.noclobber is turned on and file already exists, do not
1442 retrieve the file */
1443 logprintf (LOG_VERBOSE, _("\
1444 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
1445 /* If the file is there, we suppose it's retrieved OK. */
1448 /* #### Bogusness alert. */
1449 /* If its suffix is "html" or "htm", assume text/html. */
1450 if (((suf = suffix (*hstat.local_file)) != NULL)
1451 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
1459 if (opt.timestamping)
1461 boolean local_dot_orig_file_exists = FALSE;
1463 if (opt.backup_converted)
1464 /* If -K is specified, we'll act on the assumption that it was specified
1465 last time these files were downloaded as well, and instead of just
1466 comparing local file X against server file X, we'll compare local
1467 file X.orig (if extant, else X) against server file X. If -K
1468 _wasn't_ specified last time, or the server contains files called
1469 *.orig, -N will be back to not operating correctly with -k. */
1471 /* Would a single s[n]printf() call be faster? --dan
1473 Definitely not. sprintf() is horribly slow. It's a
1474 different question whether the difference between the two
1475 affects a program. Usually I'd say "no", but at one
1476 point I profiled Wget, and found that a measurable and
1477 non-negligible amount of time was lost calling sprintf()
1478 in url.c. Replacing sprintf with inline calls to
1479 strcpy() and long_to_string() made a difference.
1481 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
1482 memcpy (filename_plus_orig_suffix + filename_len,
1483 ".orig", sizeof (".orig"));
1485 /* Try to stat() the .orig file. */
1486 if (stat (filename_plus_orig_suffix, &st) == 0)
1488 local_dot_orig_file_exists = TRUE;
1489 local_filename = filename_plus_orig_suffix;
1493 if (!local_dot_orig_file_exists)
1494 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1495 if (stat (*hstat.local_file, &st) == 0)
1496 local_filename = *hstat.local_file;
1498 if (local_filename != NULL)
1499 /* There was a local file, so we'll check later to see if the version
1500 the server has is the same version we already have, allowing us to
1505 local_size = st.st_size;
1509 /* Reset the counter. */
1511 *dt = 0 | ACCEPTRANGES;
1515 /* Increment the pass counter. */
1517 sleep_between_retrievals (count);
1518 /* Get the current time string. */
1519 tms = time_str (NULL);
1520 /* Print fetch message, if opt.verbose. */
1523 char *hurl = url_string (u, 1);
1527 sprintf (tmp, _("(try:%2d)"), count);
1528 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1529 tms, hurl, tmp, locf);
1531 ws_changetitle (hurl, 1);
1536 /* Default document type is empty. However, if spider mode is
1537 on or time-stamping is employed, HEAD_ONLY commands is
1538 encoded within *dt. */
1539 if (opt.spider || (use_ts && !got_head))
1543 /* Assume no restarting. */
1545 /* Decide whether or not to restart. */
1546 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1547 /* #### this calls access() and then stat(); could be optimized. */
1548 && file_exists_p (locf))
1549 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1550 hstat.restval = st.st_size;
1552 /* In `-c' is used and the file is existing and non-empty,
1553 refuse to truncate it if the server doesn't support continued
1555 hstat.no_truncate = 0;
1556 if (opt.always_rest && hstat.restval)
1557 hstat.no_truncate = 1;
1559 /* Decide whether to send the no-cache directive. We send it in
1561 a) we're using a proxy, and we're past our first retrieval.
1562 Some proxies are notorious for caching incomplete data, so
1563 we require a fresh get.
1564 b) caching is explicitly inhibited. */
1565 if ((proxy && count > 1) /* a */
1566 || !opt.allow_cache /* b */
1568 *dt |= SEND_NOCACHE;
1570 *dt &= ~SEND_NOCACHE;
1572 /* Try fetching the document, or at least its head. */
1573 err = gethttp (u, &hstat, dt, proxy);
1575 /* It's unfortunate that wget determines the local filename before finding
1576 out the Content-Type of the file. Barring a major restructuring of the
1577 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1578 *hstat.local_file to tack on ".html". */
1579 if (!opt.output_document)
1580 locf = *hstat.local_file;
1582 locf = opt.output_document;
1585 tms = time_str (NULL);
1586 /* Get the new location (with or without the redirection). */
1588 *newloc = xstrdup (hstat.newloc);
1591 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1592 case CONERROR: case READERR: case WRITEFAILED:
1594 /* Non-fatal errors continue executing the loop, which will
1595 bring them to "while" statement at the end, to judge
1596 whether the number of tries was exceeded. */
1597 free_hstat (&hstat);
1598 printwhat (count, opt.ntry);
1601 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1602 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1603 /* Fatal errors just return from the function. */
1604 free_hstat (&hstat);
1608 case FWRITEERR: case FOPENERR:
1609 /* Another fatal error. */
1610 logputs (LOG_VERBOSE, "\n");
1611 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1612 *hstat.local_file, strerror (errno));
1613 free_hstat (&hstat);
1618 /* Another fatal error. */
1619 logputs (LOG_VERBOSE, "\n");
1620 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1621 free_hstat (&hstat);
1626 /* Return the new location to the caller. */
1629 logprintf (LOG_NOTQUIET,
1630 _("ERROR: Redirection (%d) without location.\n"),
1632 free_hstat (&hstat);
1636 free_hstat (&hstat);
1641 /* The file was already fully retrieved. */
1642 free_hstat (&hstat);
1647 /* Deal with you later. */
1650 /* All possibilities should have been exhausted. */
1653 if (!(*dt & RETROKF))
1657 /* #### Ugly ugly ugly! */
1658 char *hurl = url_string (u, 1);
1659 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1662 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1663 tms, hstat.statcode, hstat.error);
1664 logputs (LOG_VERBOSE, "\n");
1665 free_hstat (&hstat);
1670 /* Did we get the time-stamp? */
1673 if (opt.timestamping && !hstat.remote_time)
1675 logputs (LOG_NOTQUIET, _("\
1676 Last-modified header missing -- time-stamps turned off.\n"));
1678 else if (hstat.remote_time)
1680 /* Convert the date-string into struct tm. */
1681 tmr = http_atotm (hstat.remote_time);
1682 if (tmr == (time_t) (-1))
1683 logputs (LOG_VERBOSE, _("\
1684 Last-modified header invalid -- time-stamp ignored.\n"));
1688 /* The time-stamping section. */
1693 use_ts = 0; /* no more time-stamping */
1694 count = 0; /* the retrieve count for HEAD is
1696 if (hstat.remote_time && tmr != (time_t) (-1))
1698 /* Now time-stamping can be used validly. Time-stamping
1699 means that if the sizes of the local and remote file
1700 match, and local file is newer than the remote file,
1701 it will not be retrieved. Otherwise, the normal
1702 download procedure is resumed. */
1704 (hstat.contlen == -1 || local_size == hstat.contlen))
1706 logprintf (LOG_VERBOSE, _("\
1707 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1709 free_hstat (&hstat);
1713 else if (tml >= tmr)
1714 logprintf (LOG_VERBOSE, _("\
1715 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1717 logputs (LOG_VERBOSE,
1718 _("Remote file is newer, retrieving.\n"));
1720 free_hstat (&hstat);
1723 if ((tmr != (time_t) (-1))
1725 && ((hstat.len == hstat.contlen) ||
1726 ((hstat.res == 0) &&
1727 ((hstat.contlen == -1) ||
1728 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1730 /* #### This code repeats in http.c and ftp.c. Move it to a
1732 const char *fl = NULL;
1733 if (opt.output_document)
1735 if (opt.od_known_regular)
1736 fl = opt.output_document;
1739 fl = *hstat.local_file;
1743 /* End of time-stamping section. */
1747 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1752 tmrate = retr_rate (hstat.len - hstat.restval, hstat.dltime, 0);
1754 if (hstat.len == hstat.contlen)
1758 logprintf (LOG_VERBOSE,
1759 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1760 tms, tmrate, locf, hstat.len, hstat.contlen);
1761 logprintf (LOG_NONVERBOSE,
1762 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1763 tms, u->url, hstat.len, hstat.contlen, locf, count);
1766 downloaded_increase (hstat.len);
1768 /* Remember that we downloaded the file for later ".orig" code. */
1769 if (*dt & ADDED_HTML_EXTENSION)
1770 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1772 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1774 free_hstat (&hstat);
1778 else if (hstat.res == 0) /* No read error */
1780 if (hstat.contlen == -1) /* We don't know how much we were supposed
1781 to get, so assume we succeeded. */
1785 logprintf (LOG_VERBOSE,
1786 _("%s (%s) - `%s' saved [%ld]\n\n"),
1787 tms, tmrate, locf, hstat.len);
1788 logprintf (LOG_NONVERBOSE,
1789 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1790 tms, u->url, hstat.len, locf, count);
1793 downloaded_increase (hstat.len);
1795 /* Remember that we downloaded the file for later ".orig" code. */
1796 if (*dt & ADDED_HTML_EXTENSION)
1797 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1799 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1801 free_hstat (&hstat);
1805 else if (hstat.len < hstat.contlen) /* meaning we lost the
1806 connection too soon */
1808 logprintf (LOG_VERBOSE,
1809 _("%s (%s) - Connection closed at byte %ld. "),
1810 tms, tmrate, hstat.len);
1811 printwhat (count, opt.ntry);
1812 free_hstat (&hstat);
1815 else if (!opt.kill_longer) /* meaning we got more than expected */
1817 logprintf (LOG_VERBOSE,
1818 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1819 tms, tmrate, locf, hstat.len, hstat.contlen);
1820 logprintf (LOG_NONVERBOSE,
1821 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1822 tms, u->url, hstat.len, hstat.contlen, locf, count);
1824 downloaded_increase (hstat.len);
1826 /* Remember that we downloaded the file for later ".orig" code. */
1827 if (*dt & ADDED_HTML_EXTENSION)
1828 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1830 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1832 free_hstat (&hstat);
1836 else /* the same, but not accepted */
1838 logprintf (LOG_VERBOSE,
1839 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1840 tms, tmrate, hstat.len, hstat.contlen);
1841 printwhat (count, opt.ntry);
1842 free_hstat (&hstat);
1846 else /* now hstat.res can only be -1 */
1848 if (hstat.contlen == -1)
1850 logprintf (LOG_VERBOSE,
1851 _("%s (%s) - Read error at byte %ld (%s)."),
1852 tms, tmrate, hstat.len, strerror (errno));
1853 printwhat (count, opt.ntry);
1854 free_hstat (&hstat);
1857 else /* hstat.res == -1 and contlen is given */
1859 logprintf (LOG_VERBOSE,
1860 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1861 tms, tmrate, hstat.len, hstat.contlen,
1863 printwhat (count, opt.ntry);
1864 free_hstat (&hstat);
1871 while (!opt.ntry || (count < opt.ntry));
1875 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1876 than local timezone.
1878 mktime is similar but assumes struct tm, also known as the
1879 "broken-down" form of time, is in local time zone. mktime_from_utc
1880 uses mktime to make the conversion understanding that an offset
1881 will be introduced by the local time assumption.
1883 mktime_from_utc then measures the introduced offset by applying
1884 gmtime to the initial result and applying mktime to the resulting
1885 "broken-down" form. The difference between the two mktime results
1886 is the measured offset which is then subtracted from the initial
1887 mktime result to yield a calendar time which is the value returned.
1889 tm_isdst in struct tm is set to 0 to force mktime to introduce a
1890 consistent offset (the non DST offset) since tm and tm+o might be
1891 on opposite sides of a DST change.
1893 Some implementations of mktime return -1 for the nonexistent
1894 localtime hour at the beginning of DST. In this event, use
1895 mktime(tm - 1hr) + 3600.
1899 gmtime(t+o) --> tm+o
1900 mktime(tm+o) --> t+2o
1901 t+o - (t+2o - t+o) = t
1903 Note that glibc contains a function of the same purpose named
1904 `timegm' (reverse of gmtime). But obviously, it is not universally
1905 available, and unfortunately it is not straightforwardly
1906 extractable for use here. Perhaps configure should detect timegm
1907 and use it where available.
1909 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1910 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
1911 Further improved by Roger with assistance from Edward J. Sabol
1912 based on input by Jamie Zawinski. */
1915 mktime_from_utc (struct tm *t)
1926 return -1; /* can't deal with output from strptime */
1937 return -1; /* can't deal with output from gmtime */
1940 return (tl - (tb - tl));
1943 /* Check whether the result of strptime() indicates success.
1944 strptime() returns the pointer to how far it got to in the string.
1945 The processing has been successful if the string is at `GMT' or
1946 `+X', or at the end of the string.
1948 In extended regexp parlance, the function returns 1 if P matches
1949 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
1950 can return) is considered a failure and 0 is returned. */
1952 check_end (const char *p)
1956 while (ISSPACE (*p))
1959 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1960 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
1966 /* Convert the textual specification of time in TIME_STRING to the
1967 number of seconds since the Epoch.
1969 TIME_STRING can be in any of the three formats RFC2068 allows the
1970 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
1971 Timezones are ignored, and should be GMT.
1973 Return the computed time_t representation, or -1 if the conversion
1976 This function uses strptime with various string formats for parsing
1977 TIME_STRING. This results in a parser that is not as lenient in
1978 interpreting TIME_STRING as I would like it to be. Being based on
1979 strptime, it always allows shortened months, one-digit days, etc.,
1980 but due to the multitude of formats in which time can be
1981 represented, an ideal HTTP time parser would be even more
1982 forgiving. It should completely ignore things like week days and
1983 concentrate only on the various forms of representing years,
1984 months, days, hours, minutes, and seconds. For example, it would
1985 be nice if it accepted ISO 8601 out of the box.
1987 I've investigated free and PD code for this purpose, but none was
1988 usable. getdate was big and unwieldy, and had potential copyright
1989 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
1990 distributed with phttpd, is excellent, but we cannot use it because
1991 it is not assigned to the FSF. So I stuck it with strptime. */
1994 http_atotm (char *time_string)
1996 /* NOTE: Solaris strptime man page claims that %n and %t match white
1997 space, but that's not universally available. Instead, we simply
1998 use ` ' to mean "skip all WS", which works under all strptime
1999 implementations I've tested. */
2001 static const char *time_formats[] = {
2002 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
2003 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
2004 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
2005 (google.com uses this for their cookies.) */
2006 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2012 /* According to Roger Beeman, we need to initialize tm_isdst, since
2013 strptime won't do it. */
2016 /* Note that under foreign locales Solaris strptime() fails to
2017 recognize English dates, which renders this function useless. We
2018 solve this by being careful not to affect LC_TIME when
2019 initializing locale.
2021 Another solution would be to temporarily set locale to C, invoke
2022 strptime(), and restore it back. This is slow and dirty,
2023 however, and locale support other than LC_MESSAGES can mess other
2024 things, so I rather chose to stick with just setting LC_MESSAGES.
2026 GNU strptime does not have this problem because it recognizes
2027 both international and local dates. */
2029 for (i = 0; i < ARRAY_SIZE (time_formats); i++)
2030 if (check_end (strptime (time_string, time_formats[i], &t)))
2031 return mktime_from_utc (&t);
2033 /* All formats have failed. */
2037 /* Authorization support: We support two authorization schemes:
2039 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2041 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2042 consisting of answering to the server's challenge with the proper
2045 /* How many bytes it will take to store LEN bytes in base64. */
2046 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2048 /* Encode the string S of length LENGTH to base64 format and place it
2049 to STORE. STORE will be 0-terminated, and must point to a writable
2050 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2052 base64_encode (const char *s, char *store, int length)
2054 /* Conversion table. */
2055 static char tbl[64] = {
2056 'A','B','C','D','E','F','G','H',
2057 'I','J','K','L','M','N','O','P',
2058 'Q','R','S','T','U','V','W','X',
2059 'Y','Z','a','b','c','d','e','f',
2060 'g','h','i','j','k','l','m','n',
2061 'o','p','q','r','s','t','u','v',
2062 'w','x','y','z','0','1','2','3',
2063 '4','5','6','7','8','9','+','/'
2066 unsigned char *p = (unsigned char *)store;
2068 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2069 for (i = 0; i < length; i += 3)
2071 *p++ = tbl[s[0] >> 2];
2072 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2073 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2074 *p++ = tbl[s[2] & 0x3f];
2077 /* Pad the result if necessary... */
2078 if (i == length + 1)
2080 else if (i == length + 2)
2081 *(p - 1) = *(p - 2) = '=';
2082 /* ...and zero-terminate it. */
2086 /* Create the authentication header contents for the `Basic' scheme.
2087 This is done by encoding the string `USER:PASS' in base64 and
2088 prepending `HEADER: Basic ' to it. */
2090 basic_authentication_encode (const char *user, const char *passwd,
2093 char *t1, *t2, *res;
2094 int len1 = strlen (user) + 1 + strlen (passwd);
2095 int len2 = BASE64_LENGTH (len1);
2097 t1 = (char *)alloca (len1 + 1);
2098 sprintf (t1, "%s:%s", user, passwd);
2099 t2 = (char *)alloca (1 + len2);
2100 base64_encode (t1, t2, len1);
2101 res = (char *)xmalloc (len2 + 11 + strlen (header));
2102 sprintf (res, "%s: Basic %s\r\n", header, t2);
2108 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2109 of a field in such a header. If the field is the one specified by
2110 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2111 digest authorization code), extract its value in the (char*)
2112 variable pointed by RET. Returns negative on a malformed header,
2113 or number of bytes that have been parsed by this call. */
2115 extract_header_attr (const char *au, const char *attr_name, char **ret)
2117 const char *cp, *ep;
2121 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2123 cp += strlen (attr_name);
2126 cp += skip_lws (cp);
2131 cp += skip_lws (cp);
2136 for (ep = cp; *ep && *ep != '\"'; ep++)
2141 *ret = strdupdelim (cp, ep);
2148 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2149 an array of 16 bytes containing the hash keys, and BUF should be a
2150 buffer of 33 writable characters (32 for hex digits plus one for
2151 zero termination). */
2153 dump_hash (unsigned char *buf, const unsigned char *hash)
2157 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2159 *buf++ = XDIGIT_TO_xchar (*hash >> 4);
2160 *buf++ = XDIGIT_TO_xchar (*hash & 0xf);
2165 /* Take the line apart to find the challenge, and compose a digest
2166 authorization header. See RFC2069 section 2.1.2. */
2168 digest_authentication_encode (const char *au, const char *user,
2169 const char *passwd, const char *method,
2172 static char *realm, *opaque, *nonce;
2177 { "realm", &realm },
2178 { "opaque", &opaque },
2183 realm = opaque = nonce = NULL;
2185 au += 6; /* skip over `Digest' */
2190 au += skip_lws (au);
2191 for (i = 0; i < ARRAY_SIZE (options); i++)
2193 int skip = extract_header_attr (au, options[i].name,
2194 options[i].variable);
2198 FREE_MAYBE (opaque);
2208 if (i == ARRAY_SIZE (options))
2210 while (*au && *au != '=')
2214 au += skip_lws (au);
2218 while (*au && *au != '\"')
2225 while (*au && *au != ',')
2230 if (!realm || !nonce || !user || !passwd || !path || !method)
2233 FREE_MAYBE (opaque);
2238 /* Calculate the digest value. */
2240 ALLOCA_MD5_CONTEXT (ctx);
2241 unsigned char hash[MD5_HASHLEN];
2242 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2243 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2245 /* A1BUF = H(user ":" realm ":" password) */
2247 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2248 gen_md5_update ((unsigned char *)":", 1, ctx);
2249 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2250 gen_md5_update ((unsigned char *)":", 1, ctx);
2251 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2252 gen_md5_finish (ctx, hash);
2253 dump_hash (a1buf, hash);
2255 /* A2BUF = H(method ":" path) */
2257 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2258 gen_md5_update ((unsigned char *)":", 1, ctx);
2259 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2260 gen_md5_finish (ctx, hash);
2261 dump_hash (a2buf, hash);
2263 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2265 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2266 gen_md5_update ((unsigned char *)":", 1, ctx);
2267 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2268 gen_md5_update ((unsigned char *)":", 1, ctx);
2269 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2270 gen_md5_finish (ctx, hash);
2271 dump_hash (response_digest, hash);
2273 res = (char*) xmalloc (strlen (user)
2278 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2279 + (opaque ? strlen (opaque) : 0)
2281 sprintf (res, "Authorization: Digest \
2282 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2283 user, realm, nonce, path, response_digest);
2286 char *p = res + strlen (res);
2287 strcat (p, ", opaque=\"");
2291 strcat (res, "\r\n");
2295 #endif /* USE_DIGEST */
2298 #define BEGINS_WITH(line, string_constant) \
2299 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2300 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2301 || !line[sizeof (string_constant) - 1]))
2304 known_authentication_scheme_p (const char *au)
2306 return BEGINS_WITH (au, "Basic")
2307 || BEGINS_WITH (au, "Digest")
2308 || BEGINS_WITH (au, "NTLM");
2313 /* Create the HTTP authorization request header. When the
2314 `WWW-Authenticate' response header is seen, according to the
2315 authorization scheme specified in that header (`Basic' and `Digest'
2316 are supported by the current implementation), produce an
2317 appropriate HTTP authorization request header. */
2319 create_authorization_line (const char *au, const char *user,
2320 const char *passwd, const char *method,
2323 char *wwwauth = NULL;
2325 if (!strncasecmp (au, "Basic", 5))
2326 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2327 if (!strncasecmp (au, "NTLM", 4))
2328 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2330 else if (!strncasecmp (au, "Digest", 6))
2331 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2332 #endif /* USE_DIGEST */
2339 if (pc_last_host_ip)
2340 address_list_release (pc_last_host_ip);