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>
50 # include <netdb.h> /* for h_errno */
67 # include "gen_sslfunc.h"
71 extern char *version_string;
82 static int cookies_loaded_p;
84 #define TEXTHTML_S "text/html"
85 #define HTTP_ACCEPT "*/*"
87 /* Some status code validation macros: */
88 #define H_20X(x) (((x) >= 200) && ((x) < 300))
89 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
90 #define H_REDIRECTED(x) (((x) == HTTP_STATUS_MOVED_PERMANENTLY) \
91 || ((x) == HTTP_STATUS_MOVED_TEMPORARILY))
93 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
95 #define HTTP_STATUS_OK 200
96 #define HTTP_STATUS_CREATED 201
97 #define HTTP_STATUS_ACCEPTED 202
98 #define HTTP_STATUS_NO_CONTENT 204
99 #define HTTP_STATUS_PARTIAL_CONTENTS 206
101 /* Redirection 3xx. */
102 #define HTTP_STATUS_MULTIPLE_CHOICES 300
103 #define HTTP_STATUS_MOVED_PERMANENTLY 301
104 #define HTTP_STATUS_MOVED_TEMPORARILY 302
105 #define HTTP_STATUS_NOT_MODIFIED 304
107 /* Client error 4xx. */
108 #define HTTP_STATUS_BAD_REQUEST 400
109 #define HTTP_STATUS_UNAUTHORIZED 401
110 #define HTTP_STATUS_FORBIDDEN 403
111 #define HTTP_STATUS_NOT_FOUND 404
113 /* Server errors 5xx. */
114 #define HTTP_STATUS_INTERNAL 500
115 #define HTTP_STATUS_NOT_IMPLEMENTED 501
116 #define HTTP_STATUS_BAD_GATEWAY 502
117 #define HTTP_STATUS_UNAVAILABLE 503
120 /* Parse the HTTP status line, which is of format:
122 HTTP-Version SP Status-Code SP Reason-Phrase
124 The function returns the status-code, or -1 if the status line is
125 malformed. The pointer to reason-phrase is returned in RP. */
127 parse_http_status_line (const char *line, const char **reason_phrase_ptr)
129 /* (the variables must not be named `major' and `minor', because
130 that breaks compilation with SunOS4 cc.) */
131 int mjr, mnr, statcode;
134 *reason_phrase_ptr = NULL;
136 /* The standard format of HTTP-Version is: `HTTP/X.Y', where X is
137 major version, and Y is minor version. */
138 if (strncmp (line, "HTTP/", 5) != 0)
142 /* Calculate major HTTP version. */
144 for (mjr = 0; ISDIGIT (*line); line++)
145 mjr = 10 * mjr + (*line - '0');
146 if (*line != '.' || p == line)
150 /* Calculate minor HTTP version. */
152 for (mnr = 0; ISDIGIT (*line); line++)
153 mnr = 10 * mnr + (*line - '0');
154 if (*line != ' ' || p == line)
156 /* Wget will accept only 1.0 and higher HTTP-versions. The value of
157 minor version can be safely ignored. */
162 /* Calculate status code. */
163 if (!(ISDIGIT (*line) && ISDIGIT (line[1]) && ISDIGIT (line[2])))
165 statcode = 100 * (*line - '0') + 10 * (line[1] - '0') + (line[2] - '0');
167 /* Set up the reason phrase pointer. */
169 /* RFC2068 requires SPC here, but we allow the string to finish
170 here, in case no reason-phrase is present. */
174 *reason_phrase_ptr = line;
179 *reason_phrase_ptr = line + 1;
184 /* Functions to be used as arguments to header_process(): */
186 struct http_process_range_closure {
192 /* Parse the `Content-Range' header and extract the information it
193 contains. Returns 1 if successful, -1 otherwise. */
195 http_process_range (const char *hdr, void *arg)
197 struct http_process_range_closure *closure
198 = (struct http_process_range_closure *)arg;
201 /* Certain versions of Nutscape proxy server send out
202 `Content-Length' without "bytes" specifier, which is a breach of
203 RFC2068 (as well as the HTTP/1.1 draft which was current at the
204 time). But hell, I must support it... */
205 if (!strncasecmp (hdr, "bytes", 5))
208 hdr += skip_lws (hdr);
214 for (num = 0; ISDIGIT (*hdr); hdr++)
215 num = 10 * num + (*hdr - '0');
216 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
218 closure->first_byte_pos = num;
220 for (num = 0; ISDIGIT (*hdr); hdr++)
221 num = 10 * num + (*hdr - '0');
222 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
224 closure->last_byte_pos = num;
226 for (num = 0; ISDIGIT (*hdr); hdr++)
227 num = 10 * num + (*hdr - '0');
228 closure->entity_length = num;
232 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
233 Used for `Accept-Ranges'. */
235 http_process_none (const char *hdr, void *arg)
237 int *where = (int *)arg;
239 if (strstr (hdr, "none"))
246 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
248 http_process_type (const char *hdr, void *arg)
250 char **result = (char **)arg;
251 /* Locate P on `;' or the terminating zero, whichever comes first. */
252 const char *p = strchr (hdr, ';');
254 p = hdr + strlen (hdr);
255 while (p > hdr && ISSPACE (*(p - 1)))
257 *result = strdupdelim (hdr, p);
261 /* Check whether the `Connection' header is set to "keep-alive". */
263 http_process_connection (const char *hdr, void *arg)
265 int *flag = (int *)arg;
266 if (!strcasecmp (hdr, "Keep-Alive"))
271 /* Persistent connections. Currently, we cache the most recently used
272 connection as persistent, provided that the HTTP server agrees to
273 make it such. The persistence data is stored in the variables
274 below. Ideally, it would be in a structure, and it should be
275 possible to cache an arbitrary fixed number of these connections.
277 I think the code is quite easy to extend in that direction. */
279 /* Whether a persistent connection is active. */
280 static int pc_active_p;
281 /* Host and port of currently active persistent connection. */
282 static unsigned char pc_last_host[4];
283 static unsigned short pc_last_port;
285 /* File descriptor of the currently active persistent connection. */
286 static int pc_last_fd;
289 /* Whether a ssl handshake has occoured on this connection */
290 static int pc_active_ssl;
291 /* SSL connection of the currently active persistent connection. */
292 static SSL *pc_last_ssl;
293 #endif /* HAVE_SSL */
295 /* Mark the persistent connection as invalid. This is used by the
296 CLOSE_* macros after they forcefully close a registered persistent
297 connection. This does not close the file descriptor -- it is left
298 to the caller to do that. (Maybe it should, though.) */
301 invalidate_persistent (void)
306 #endif /* HAVE_SSL */
307 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
310 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
311 persistent. This will enable someone to use the same connection
312 later. In the context of HTTP, this must be called only AFTER the
313 response has been received and the server has promised that the
314 connection will remain alive.
316 If a previous connection was persistent, it is closed. */
319 register_persistent (const char *host, unsigned short port, int fd
329 if (pc_last_fd == fd)
331 /* The connection FD is already registered. Nothing to
337 /* The old persistent connection is still active; let's
338 close it first. This situation arises whenever a
339 persistent connection exists, but we then connect to a
340 different host, and try to register a persistent
341 connection to that one. */
343 /* The ssl disconnect has to take place before the closing
346 shutdown_ssl(pc_last_ssl);
349 invalidate_persistent ();
353 /* This store_hostaddress may not fail, because it has the results
355 success = store_hostaddress (pc_last_host, host);
362 pc_active_ssl = ssl ? 1 : 0;
364 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
367 /* Return non-zero if a persistent connection is available for
368 connecting to HOST:PORT. */
371 persistent_available_p (const char *host, unsigned short port
377 unsigned char this_host[4];
378 /* First, check whether a persistent connection is active at all. */
381 /* Second, check if the active connection pertains to the correct
382 (HOST, PORT) ordered pair. */
383 if (port != pc_last_port)
386 /* Second, a): check if current connection is (not) ssl, too. This
387 test is unlikely to fail because HTTP and HTTPS typicaly use
388 different ports. Yet it is possible, or so I [Christian
389 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
391 if (ssl != pc_active_ssl)
393 #endif /* HAVE_SSL */
394 if (!store_hostaddress (this_host, host))
396 if (memcmp (pc_last_host, this_host, 4))
398 /* Third: check whether the connection is still open. This is
399 important because most server implement a liberal (short) timeout
400 on persistent connections. Wget can of course always reconnect
401 if the connection doesn't work out, but it's nicer to know in
402 advance. This test is a logical followup of the first test, but
403 is "expensive" and therefore placed at the end of the list. */
404 if (!test_socket_open (pc_last_fd))
406 /* Oops, the socket is no longer open. Now that we know that,
407 let's invalidate the persistent connection before returning
410 invalidate_persistent ();
417 # define SHUTDOWN_SSL(ssl) do { \
419 shutdown_ssl (ssl); \
422 # define SHUTDOWN_SSL(ssl)
425 /* The idea behind these two CLOSE macros is to distinguish between
426 two cases: one when the job we've been doing is finished, and we
427 want to close the connection and leave, and two when something is
428 seriously wrong and we're closing the connection as part of
431 In case of keep_alive, CLOSE_FINISH should leave the connection
432 open, while CLOSE_INVALIDATE should still close it.
434 Note that the semantics of the flag `keep_alive' is "this
435 connection *will* be reused (the server has promised not to close
436 the connection once we're done)", while the semantics of
437 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
438 active, registered connection". */
440 #define CLOSE_FINISH(fd) do { \
443 SHUTDOWN_SSL (ssl); \
445 if (pc_active_p && (fd) == pc_last_fd) \
446 invalidate_persistent (); \
450 #define CLOSE_INVALIDATE(fd) do { \
451 SHUTDOWN_SSL (ssl); \
453 if (pc_active_p && (fd) == pc_last_fd) \
454 invalidate_persistent (); \
459 long len; /* received length */
460 long contlen; /* expected length */
461 long restval; /* the restart value */
462 int res; /* the result of last read */
463 char *newloc; /* new location (redirection) */
464 char *remote_time; /* remote time-stamp string */
465 char *error; /* textual HTTP error */
466 int statcode; /* status code */
467 long dltime; /* time of the download */
468 int no_truncate; /* whether truncating the file is
472 /* Free the elements of hstat X. */
473 #define FREEHSTAT(x) do \
475 FREE_MAYBE ((x).newloc); \
476 FREE_MAYBE ((x).remote_time); \
477 FREE_MAYBE ((x).error); \
478 (x).newloc = (x).remote_time = (x).error = NULL; \
481 static char *create_authorization_line PARAMS ((const char *, const char *,
482 const char *, const char *,
484 static char *basic_authentication_encode PARAMS ((const char *, const char *,
486 static int known_authentication_scheme_p PARAMS ((const char *));
488 time_t http_atotm PARAMS ((char *));
490 #define BEGINS_WITH(line, string_constant) \
491 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
492 && (ISSPACE (line[sizeof (string_constant) - 1]) \
493 || !line[sizeof (string_constant) - 1]))
495 /* Retrieve a document through HTTP protocol. It recognizes status
496 code, and correctly handles redirections. It closes the network
497 socket. If it receives an error from the functions below it, it
498 will print it if there is enough information to do so (almost
499 always), returning the error to the caller (i.e. http_loop).
501 Various HTTP parameters are stored to hs. Although it parses the
502 response code correctly, it is not used in a sane way. The caller
505 If u->proxy is non-NULL, the URL u will be taken as a proxy URL,
506 and u->proxy->url will be given to the proxy server (bad naming,
509 gethttp (struct urlinfo *u, struct http_stat *hs, int *dt)
511 char *request, *type, *command, *path;
513 char *pragma_h, *referer, *useragent, *range, *wwwauth, *remhost;
514 char *authenticate_h;
518 char *request_keep_alive;
519 int sock, hcount, num_written, all_length, remport, statcode;
520 long contlen, contrange;
524 int auth_tried_already;
527 static SSL_CTX *ssl_ctx = NULL;
529 #endif /* HAVE_SSL */
530 struct wget_timer *timer;
531 char *cookies = NULL;
533 /* Whether this connection will be kept alive after the HTTP request
537 /* Flags that detect the two ways of specifying HTTP keep-alive
539 int http_keep_alive_1, http_keep_alive_2;
541 /* Whether keep-alive should be inhibited. */
542 int inhibit_keep_alive;
545 /* initialize ssl_ctx on first run */
548 err=init_ssl (&ssl_ctx);
553 case SSLERRCTXCREATE:
555 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
559 /* try without certfile */
560 logprintf (LOG_NOTQUIET,
561 _("Failed to load certificates from %s\n"),
564 logprintf (LOG_NOTQUIET,
565 _("Trying without the specified certificate\n"));
568 logprintf (LOG_NOTQUIET,
569 _("Failed to get certificate key from %s\n"),
572 logprintf (LOG_NOTQUIET,
573 _("Trying without the specified certificate\n"));
580 #endif /* HAVE_SSL */
582 if (!(*dt & HEAD_ONLY))
583 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
584 know the local filename so we can save to it. */
585 assert (u->local != NULL);
588 auth_tried_already = 0;
590 inhibit_keep_alive = (!opt.http_keep_alive || u->proxy != NULL);
593 /* We need to come back here when the initial attempt to retrieve
594 without authorization header fails. (Expected to happen at least
595 for the Digest authorization scheme.) */
598 http_keep_alive_1 = http_keep_alive_2 = 0;
600 /* Initialize certain elements of struct http_stat. */
605 hs->remote_time = NULL;
608 /* Which structure to use to retrieve the original URL data. */
614 /* First: establish the connection. */
615 if (inhibit_keep_alive
618 !persistent_available_p (u->host, u->port)
620 !persistent_available_p (u->host, u->port, (u->proto==URLHTTPS ? 1 : 0))
621 #endif /* HAVE_SSL */
624 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "), u->host, u->port);
625 err = make_connection (&sock, u->host, u->port);
629 logputs (LOG_VERBOSE, "\n");
630 logprintf (LOG_NOTQUIET, "%s: %s.\n", u->host, herrmsg (h_errno));
634 logputs (LOG_VERBOSE, "\n");
635 logprintf (LOG_NOTQUIET, "socket: %s\n", strerror (errno));
639 logputs (LOG_VERBOSE, "\n");
640 logprintf (LOG_NOTQUIET,
641 _("Connection to %s:%hu refused.\n"), u->host, u->port);
645 logputs (LOG_VERBOSE, "\n");
646 logprintf (LOG_NOTQUIET, "connect: %s\n", strerror (errno));
651 /* Everything is fine! */
652 logputs (LOG_VERBOSE, _("connected!\n"));
659 if (u->proto == URLHTTPS)
660 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
662 logputs (LOG_VERBOSE, "\n");
663 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
668 #endif /* HAVE_SSL */
672 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"), u->host, u->port);
673 /* #### pc_last_fd should be accessed through an accessor
678 #endif /* HAVE_SSL */
679 DEBUGP (("Reusing fd %d.\n", sock));
683 path = u->proxy->url;
687 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
691 referer = (char *)alloca (9 + strlen (ou->referer) + 3);
692 sprintf (referer, "Referer: %s\r\n", ou->referer);
694 if (*dt & SEND_NOCACHE)
695 pragma_h = "Pragma: no-cache\r\n";
700 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
701 /* Gag me! Some servers (e.g. WebSitePro) have been known to
702 respond to the following `Range' format by generating a
703 multipart/x-byte-ranges MIME document! This MIME type was
704 present in an old draft of the byteranges specification.
705 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
706 only if multiple non-overlapping ranges are requested --
707 which Wget never does. */
708 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
713 STRDUP_ALLOCA (useragent, opt.useragent);
716 useragent = (char *)alloca (10 + strlen (version_string));
717 sprintf (useragent, "Wget/%s", version_string);
719 /* Construct the authentication, if userid is present. */
722 search_netrc (ou->host, (const char **)&user, (const char **)&passwd, 0);
723 user = user ? user : opt.http_user;
724 passwd = passwd ? passwd : opt.http_passwd;
731 /* We have the username and the password, but haven't tried
732 any authorization yet. Let's see if the "Basic" method
733 works. If not, we'll come back here and construct a
734 proper authorization method with the right challenges.
736 If we didn't employ this kind of logic, every URL that
737 requires authorization would have to be processed twice,
738 which is very suboptimal and generates a bunch of false
739 "unauthorized" errors in the server log.
741 #### But this logic also has a serious problem when used
742 with stronger authentications: we *first* transmit the
743 username and the password in clear text, and *then*
744 attempt a stronger authentication scheme. That cannot be
745 right! We are only fortunate that almost everyone still
746 uses the `Basic' scheme anyway.
748 There should be an option to prevent this from happening,
749 for those who use strong authentication schemes and value
751 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
755 wwwauth = create_authorization_line (authenticate_h, user, passwd,
763 char *proxy_user, *proxy_passwd;
764 /* For normal username and password, URL components override
765 command-line/wgetrc parameters. With proxy authentication,
766 it's the reverse, because proxy URLs are normally the
767 "permanent" ones, so command-line args should take
769 if (opt.proxy_user && opt.proxy_passwd)
771 proxy_user = opt.proxy_user;
772 proxy_passwd = opt.proxy_passwd;
776 proxy_user = u->user;
777 proxy_passwd = u->passwd;
779 /* #### This is junky. Can't the proxy request, say, `Digest'
781 if (proxy_user && proxy_passwd)
782 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
783 "Proxy-Authorization");
788 /* String of the form :PORT. Used only for non-standard ports. */
792 && remport != (u->proto == URLHTTPS
793 ? DEFAULT_HTTPS_PORT : DEFAULT_HTTP_PORT)
795 && remport != DEFAULT_HTTP_PORT
799 port_maybe = (char *)alloca (numdigit (remport) + 2);
800 sprintf (port_maybe, ":%d", remport);
803 if (!inhibit_keep_alive)
804 request_keep_alive = "Connection: Keep-Alive\r\n";
806 request_keep_alive = NULL;
809 cookies = build_cookies_request (ou->host, ou->port, ou->path,
810 ou->proto == URLHTTPS);
812 /* Allocate the memory for the request. */
813 request = (char *)alloca (strlen (command) + strlen (path)
816 + (port_maybe ? strlen (port_maybe) : 0)
817 + strlen (HTTP_ACCEPT)
818 + (request_keep_alive
819 ? strlen (request_keep_alive) : 0)
820 + (referer ? strlen (referer) : 0)
821 + (cookies ? strlen (cookies) : 0)
822 + (wwwauth ? strlen (wwwauth) : 0)
823 + (proxyauth ? strlen (proxyauth) : 0)
824 + (range ? strlen (range) : 0)
826 + (opt.user_header ? strlen (opt.user_header) : 0)
828 /* Construct the request. */
834 %s%s%s%s%s%s%s%s\r\n",
835 command, path, useragent, remhost,
836 port_maybe ? port_maybe : "",
838 request_keep_alive ? request_keep_alive : "",
839 referer ? referer : "",
840 cookies ? cookies : "",
841 wwwauth ? wwwauth : "",
842 proxyauth ? proxyauth : "",
845 opt.user_header ? opt.user_header : "");
846 DEBUGP (("---request begin---\n%s---request end---\n", request));
847 /* Free the temporary memory. */
848 FREE_MAYBE (wwwauth);
849 FREE_MAYBE (proxyauth);
850 FREE_MAYBE (cookies);
852 /* Send the request to server. */
854 if (u->proto == URLHTTPS)
855 num_written = ssl_iwrite (ssl, request, strlen (request));
857 #endif /* HAVE_SSL */
858 num_written = iwrite (sock, request, strlen (request));
862 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
864 CLOSE_INVALIDATE (sock);
867 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
868 u->proxy ? "Proxy" : "HTTP");
869 contlen = contrange = -1;
874 /* Before reading anything, initialize the rbuf. */
875 rbuf_initialize (&rbuf, sock);
877 if (u->proto == URLHTTPS)
881 #endif /* HAVE_SSL */
884 /* Header-fetching loop. */
892 /* Get the header. */
893 status = header_get (&rbuf, &hdr,
894 /* Disallow continuations for status line. */
895 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
897 /* Check for errors. */
898 if (status == HG_EOF && *hdr)
900 /* This used to be an unconditional error, but that was
901 somewhat controversial, because of a large number of
902 broken CGI's that happily "forget" to send the second EOL
903 before closing the connection of a HEAD request.
905 So, the deal is to check whether the header is empty
906 (*hdr is zero if it is); if yes, it means that the
907 previous header was fully retrieved, and that -- most
908 probably -- the request is complete. "...be liberal in
909 what you accept." Oh boy. */
910 logputs (LOG_VERBOSE, "\n");
911 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
914 FREE_MAYBE (all_headers);
915 CLOSE_INVALIDATE (sock);
918 else if (status == HG_ERROR)
920 logputs (LOG_VERBOSE, "\n");
921 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
925 FREE_MAYBE (all_headers);
926 CLOSE_INVALIDATE (sock);
930 /* If the headers are to be saved to a file later, save them to
932 if (opt.save_headers)
934 int lh = strlen (hdr);
935 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
936 memcpy (all_headers + all_length, hdr, lh);
938 all_headers[all_length++] = '\n';
939 all_headers[all_length] = '\0';
942 /* Check for status line. */
946 /* Parse the first line of server response. */
947 statcode = parse_http_status_line (hdr, &error);
948 hs->statcode = statcode;
949 /* Store the descriptive response. */
950 if (statcode == -1) /* malformed response */
952 /* A common reason for "malformed response" error is the
953 case when no data was actually received. Handle this
956 hs->error = xstrdup (_("No data received"));
958 hs->error = xstrdup (_("Malformed status line"));
963 hs->error = xstrdup (_("(no description)"));
965 hs->error = xstrdup (error);
973 if (opt.server_response)
974 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
976 logprintf (LOG_VERBOSE, "%2d %s", statcode, error);
982 /* Exit on empty header. */
989 /* Print the header if requested. */
990 if (opt.server_response && hcount != 1)
991 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
993 /* Try getting content-length. */
994 if (contlen == -1 && !opt.ignore_length)
995 if (header_process (hdr, "Content-Length", header_extract_number,
998 /* Try getting content-type. */
1000 if (header_process (hdr, "Content-Type", http_process_type, &type))
1002 /* Try getting location. */
1004 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1006 /* Try getting last-modified. */
1007 if (!hs->remote_time)
1008 if (header_process (hdr, "Last-Modified", header_strdup,
1011 /* Try getting cookies. */
1013 if (header_process (hdr, "Set-Cookie", set_cookie_header_cb, u))
1015 /* Try getting www-authentication. */
1016 if (!authenticate_h)
1017 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1020 /* Check for accept-ranges header. If it contains the word
1021 `none', disable the ranges. */
1022 if (*dt & ACCEPTRANGES)
1025 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1028 *dt &= ~ACCEPTRANGES;
1032 /* Try getting content-range. */
1033 if (contrange == -1)
1035 struct http_process_range_closure closure;
1036 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1038 contrange = closure.first_byte_pos;
1042 /* Check for keep-alive related responses. */
1043 if (!inhibit_keep_alive)
1045 /* Check for the `Keep-Alive' header. */
1046 if (!http_keep_alive_1)
1048 if (header_process (hdr, "Keep-Alive", header_exists,
1049 &http_keep_alive_1))
1052 /* Check for `Connection: Keep-Alive'. */
1053 if (!http_keep_alive_2)
1055 if (header_process (hdr, "Connection", http_process_connection,
1056 &http_keep_alive_2))
1064 logputs (LOG_VERBOSE, "\n");
1067 && (http_keep_alive_1 || http_keep_alive_2))
1069 assert (inhibit_keep_alive == 0);
1073 /* The server has promised that it will not close the connection
1074 when we're done. This means that we can register it. */
1076 register_persistent (u->host, u->port, sock);
1078 register_persistent (u->host, u->port, sock, ssl);
1079 #endif /* HAVE_SSL */
1081 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1084 /* Authorization is required. */
1088 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1089 might be more bytes in the body. */
1090 if (auth_tried_already)
1092 /* If we have tried it already, then there is not point
1095 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1096 xfree (authenticate_h);
1099 else if (!known_authentication_scheme_p (authenticate_h))
1101 xfree (authenticate_h);
1102 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1105 else if (BEGINS_WITH (authenticate_h, "Basic"))
1107 /* The authentication scheme is basic, the one we try by
1108 default, and it failed. There's no sense in trying
1114 auth_tried_already = 1;
1118 /* We do not need this anymore. */
1121 xfree (authenticate_h);
1122 authenticate_h = NULL;
1125 /* 20x responses are counted among successful by default. */
1126 if (H_20X (statcode))
1129 /* Return if redirected. */
1130 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1132 /* RFC2068 says that in case of the 300 (multiple choices)
1133 response, the server can output a preferred URL through
1134 `Location' header; otherwise, the request should be treated
1135 like GET. So, if the location is set, it will be a
1136 redirection; otherwise, just proceed normally. */
1137 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1141 logprintf (LOG_VERBOSE,
1142 _("Location: %s%s\n"),
1143 hs->newloc ? hs->newloc : _("unspecified"),
1144 hs->newloc ? _(" [following]") : "");
1145 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1146 might be more bytes in the body. */
1148 FREE_MAYBE (all_headers);
1153 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
1156 /* We don't assume text/html by default. */
1159 if (opt.html_extension && (*dt & TEXTHTML))
1160 /* -E / --html-extension / html_extension = on was specified, and this is a
1161 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1162 already the file's suffix, tack on ".html". */
1164 char* last_period_in_local_filename = strrchr(u->local, '.');
1166 if (last_period_in_local_filename == NULL ||
1167 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
1168 strcasecmp(last_period_in_local_filename, ".html") == EQ))
1170 size_t local_filename_len = strlen(u->local);
1172 u->local = xrealloc(u->local, local_filename_len + sizeof(".html"));
1173 strcpy(u->local + local_filename_len, ".html");
1175 *dt |= ADDED_HTML_EXTENSION;
1179 if (contrange == -1)
1181 /* We did not get a content-range header. This means that the
1182 server did not honor our `Range' request. Normally, this
1183 means we should reset hs->restval and continue normally. */
1185 /* However, if `-c' is used, we need to be a bit more careful:
1187 1. If `-c' is specified and the file already existed when
1188 Wget was started, it would be a bad idea for us to start
1189 downloading it from scratch, effectively truncating it. I
1190 believe this cannot happen unless `-c' was specified.
1192 2. If `-c' is used on a file that is already fully
1193 downloaded, we're requesting bytes after the end of file,
1194 which can result in server not honoring `Range'. If this is
1195 the case, `Content-Length' will be equal to the length of the
1197 if (opt.always_rest)
1199 /* Check for condition #2. */
1200 if (hs->restval > 0 /* restart was requested. */
1201 && contlen != -1 /* we got content-length. */
1202 && hs->restval >= contlen /* file fully downloaded
1206 logputs (LOG_VERBOSE, _("\
1207 \n The file is already fully retrieved; nothing to do.\n\n"));
1208 /* In case the caller inspects. */
1212 FREE_MAYBE (all_headers);
1213 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1214 might be more bytes in the body. */
1215 return RETRUNNEEDED;
1218 /* Check for condition #1. */
1219 if (hs->no_truncate)
1221 logprintf (LOG_NOTQUIET,
1224 Continued download failed on this file, which conflicts with `-c'.\n\
1225 Refusing to truncate existing file `%s'.\n\n"), u->local);
1227 FREE_MAYBE (all_headers);
1228 CLOSE_INVALIDATE (sock);
1229 return CONTNOTSUPPORTED;
1237 else if (contrange != hs->restval ||
1238 (H_PARTIAL (statcode) && contrange == -1))
1240 /* This means the whole request was somehow misunderstood by the
1241 server. Bail out. */
1243 FREE_MAYBE (all_headers);
1244 CLOSE_INVALIDATE (sock);
1251 contlen += contrange;
1253 contrange = -1; /* If conent-length was not sent,
1254 content-range will be ignored. */
1256 hs->contlen = contlen;
1260 if ((*dt & RETROKF) && !opt.server_response)
1262 /* No need to print this output if the body won't be
1263 downloaded at all, or if the original server response is
1265 logputs (LOG_VERBOSE, _("Length: "));
1268 logputs (LOG_VERBOSE, legible (contlen));
1269 if (contrange != -1)
1270 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1271 legible (contlen - contrange));
1274 logputs (LOG_VERBOSE,
1275 opt.ignore_length ? _("ignored") : _("unspecified"));
1277 logprintf (LOG_VERBOSE, " [%s]\n", type);
1279 logputs (LOG_VERBOSE, "\n");
1283 type = NULL; /* We don't need it any more. */
1285 /* Return if we have no intention of further downloading. */
1286 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1288 /* In case the caller cares to look... */
1292 FREE_MAYBE (all_headers);
1293 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1294 might be more bytes in the body. */
1295 return RETRFINISHED;
1298 /* Open the local file. */
1301 mkalldirs (u->local);
1303 rotate_backups (u->local);
1304 fp = fopen (u->local, hs->restval ? "ab" : "wb");
1307 logprintf (LOG_NOTQUIET, "%s: %s\n", u->local, strerror (errno));
1308 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1309 might be more bytes in the body. */
1310 FREE_MAYBE (all_headers);
1316 extern int global_download_count;
1318 /* To ensure that repeated "from scratch" downloads work for -O
1319 files, we rewind the file pointer, unless restval is
1320 non-zero. (This works only when -O is used on regular files,
1321 but it's still a valuable feature.)
1323 However, this loses when more than one URL is specified on
1324 the command line the second rewinds eradicates the contents
1325 of the first download. Thus we disable the above trick for
1326 all the downloads except the very first one.
1328 #### A possible solution to this would be to remember the
1329 file position in the output document and to seek to that
1330 position, instead of rewinding. */
1331 if (!hs->restval && global_download_count == 0)
1333 /* This will silently fail for streams that don't correspond
1334 to regular files, but that's OK. */
1336 /* ftruncate is needed because opt.dfp is opened in append
1337 mode if opt.always_rest is set. */
1338 ftruncate (fileno (fp), 0);
1343 /* #### This confuses the code that checks for file size. There
1344 should be some overhead information. */
1345 if (opt.save_headers)
1346 fwrite (all_headers, 1, all_length, fp);
1347 timer = wtimer_new ();
1348 /* Get the contents of the document. */
1349 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1350 (contlen != -1 ? contlen : 0),
1352 hs->dltime = wtimer_elapsed (timer);
1353 wtimer_delete (timer);
1355 /* Close or flush the file. We have to be careful to check for
1356 error here. Checking the result of fwrite() is not enough --
1357 errors could go unnoticed! */
1360 flush_res = fclose (fp);
1362 flush_res = fflush (fp);
1363 if (flush_res == EOF)
1366 FREE_MAYBE (all_headers);
1367 CLOSE_FINISH (sock);
1370 return RETRFINISHED;
1373 /* The genuine HTTP loop! This is the part where the retrieval is
1374 retried, and retried, and retried, and... */
1376 http_loop (struct urlinfo *u, char **newloc, int *dt)
1379 int use_ts, got_head = 0; /* time-stamping info */
1380 char *filename_plus_orig_suffix;
1381 char *local_filename = NULL;
1382 char *tms, *suf, *locf, *tmrate;
1384 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1385 long local_size = 0; /* the size of the local file */
1386 size_t filename_len;
1387 struct http_stat hstat; /* HTTP status */
1390 /* This used to be done in main(), but it's a better idea to do it
1391 here so that we don't go through the hoops if we're just using
1393 if (opt.cookies && opt.cookies_input && !cookies_loaded_p)
1395 load_cookies (opt.cookies_input);
1396 cookies_loaded_p = 1;
1401 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1402 has_wildcards_p because it would also warn on `?', and we know that
1403 shows up in CGI paths a *lot*. */
1404 if (strchr (u->url, '*'))
1405 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1407 /* Determine the local filename. */
1409 u->local = url_filename (u->proxy ? u->proxy : u);
1411 if (!opt.output_document)
1414 locf = opt.output_document;
1416 filename_len = strlen (u->local);
1417 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1419 if (opt.noclobber && file_exists_p (u->local))
1421 /* If opt.noclobber is turned on and file already exists, do not
1422 retrieve the file */
1423 logprintf (LOG_VERBOSE, _("\
1424 File `%s' already there, will not retrieve.\n"), u->local);
1425 /* If the file is there, we suppose it's retrieved OK. */
1428 /* #### Bogusness alert. */
1429 /* If its suffix is "html" or (yuck!) "htm", we suppose it's
1430 text/html, a harmless lie. */
1431 if (((suf = suffix (u->local)) != NULL)
1432 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
1435 /* Another harmless lie: */
1440 if (opt.timestamping)
1442 boolean local_dot_orig_file_exists = FALSE;
1444 if (opt.backup_converted)
1445 /* If -K is specified, we'll act on the assumption that it was specified
1446 last time these files were downloaded as well, and instead of just
1447 comparing local file X against server file X, we'll compare local
1448 file X.orig (if extant, else X) against server file X. If -K
1449 _wasn't_ specified last time, or the server contains files called
1450 *.orig, -N will be back to not operating correctly with -k. */
1452 /* Would a single s[n]printf() call be faster? --dan
1454 Definitely not. sprintf() is horribly slow. It's a
1455 different question whether the difference between the two
1456 affects a program. Usually I'd say "no", but at one
1457 point I profiled Wget, and found that a measurable and
1458 non-negligible amount of time was lost calling sprintf()
1459 in url.c. Replacing sprintf with inline calls to
1460 strcpy() and long_to_string() made a difference.
1462 memcpy (filename_plus_orig_suffix, u->local, filename_len);
1463 memcpy (filename_plus_orig_suffix + filename_len,
1464 ".orig", sizeof (".orig"));
1466 /* Try to stat() the .orig file. */
1467 if (stat (filename_plus_orig_suffix, &st) == 0)
1469 local_dot_orig_file_exists = TRUE;
1470 local_filename = filename_plus_orig_suffix;
1474 if (!local_dot_orig_file_exists)
1475 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1476 if (stat (u->local, &st) == 0)
1477 local_filename = u->local;
1479 if (local_filename != NULL)
1480 /* There was a local file, so we'll check later to see if the version
1481 the server has is the same version we already have, allowing us to
1486 local_size = st.st_size;
1490 /* Reset the counter. */
1492 *dt = 0 | ACCEPTRANGES;
1496 /* Increment the pass counter. */
1498 sleep_between_retrievals (count);
1499 /* Get the current time string. */
1500 tms = time_str (NULL);
1501 /* Print fetch message, if opt.verbose. */
1504 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1508 sprintf (tmp, _("(try:%2d)"), count);
1509 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1510 tms, hurl, tmp, locf);
1512 ws_changetitle (hurl, 1);
1517 /* Default document type is empty. However, if spider mode is
1518 on or time-stamping is employed, HEAD_ONLY commands is
1519 encoded within *dt. */
1520 if (opt.spider || (use_ts && !got_head))
1524 /* Assume no restarting. */
1526 /* Decide whether or not to restart. */
1527 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1528 /* #### this calls access() and then stat(); could be optimized. */
1529 && file_exists_p (locf))
1530 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1531 hstat.restval = st.st_size;
1533 /* In `-c' is used and the file is existing and non-empty,
1534 refuse to truncate it if the server doesn't support continued
1536 hstat.no_truncate = 0;
1537 if (opt.always_rest && hstat.restval)
1538 hstat.no_truncate = 1;
1540 /* Decide whether to send the no-cache directive. We send it in
1542 a) we're using a proxy, and we're past our first retrieval.
1543 Some proxies are notorious for caching incomplete data, so
1544 we require a fresh get.
1545 b) caching is explicitly inhibited. */
1546 if ((u->proxy && count > 1) /* a */
1547 || !opt.allow_cache /* b */
1549 *dt |= SEND_NOCACHE;
1551 *dt &= ~SEND_NOCACHE;
1553 /* Try fetching the document, or at least its head. :-) */
1554 err = gethttp (u, &hstat, dt);
1556 /* It's unfortunate that wget determines the local filename before finding
1557 out the Content-Type of the file. Barring a major restructuring of the
1558 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1559 u->local to tack on ".html". */
1560 if (!opt.output_document)
1563 locf = opt.output_document;
1566 tms = time_str (NULL);
1567 /* Get the new location (with or without the redirection). */
1569 *newloc = xstrdup (hstat.newloc);
1572 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1573 case CONERROR: case READERR: case WRITEFAILED:
1575 /* Non-fatal errors continue executing the loop, which will
1576 bring them to "while" statement at the end, to judge
1577 whether the number of tries was exceeded. */
1579 printwhat (count, opt.ntry);
1582 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1583 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1584 /* Fatal errors just return from the function. */
1588 case FWRITEERR: case FOPENERR:
1589 /* Another fatal error. */
1590 logputs (LOG_VERBOSE, "\n");
1591 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1592 u->local, strerror (errno));
1597 /* Another fatal error. */
1598 logputs (LOG_VERBOSE, "\n");
1599 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1604 /* Return the new location to the caller. */
1607 logprintf (LOG_NOTQUIET,
1608 _("ERROR: Redirection (%d) without location.\n"),
1616 /* The file was already fully retrieved. */
1621 /* Deal with you later. */
1624 /* All possibilities should have been exhausted. */
1627 if (!(*dt & RETROKF))
1631 /* #### Ugly ugly ugly! */
1632 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1633 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1636 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1637 tms, hstat.statcode, hstat.error);
1638 logputs (LOG_VERBOSE, "\n");
1643 /* Did we get the time-stamp? */
1646 if (opt.timestamping && !hstat.remote_time)
1648 logputs (LOG_NOTQUIET, _("\
1649 Last-modified header missing -- time-stamps turned off.\n"));
1651 else if (hstat.remote_time)
1653 /* Convert the date-string into struct tm. */
1654 tmr = http_atotm (hstat.remote_time);
1655 if (tmr == (time_t) (-1))
1656 logputs (LOG_VERBOSE, _("\
1657 Last-modified header invalid -- time-stamp ignored.\n"));
1661 /* The time-stamping section. */
1666 use_ts = 0; /* no more time-stamping */
1667 count = 0; /* the retrieve count for HEAD is
1669 if (hstat.remote_time && tmr != (time_t) (-1))
1671 /* Now time-stamping can be used validly. Time-stamping
1672 means that if the sizes of the local and remote file
1673 match, and local file is newer than the remote file,
1674 it will not be retrieved. Otherwise, the normal
1675 download procedure is resumed. */
1677 (hstat.contlen == -1 || local_size == hstat.contlen))
1679 logprintf (LOG_VERBOSE, _("\
1680 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1685 else if (tml >= tmr)
1686 logprintf (LOG_VERBOSE, _("\
1687 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1689 logputs (LOG_VERBOSE,
1690 _("Remote file is newer, retrieving.\n"));
1695 if ((tmr != (time_t) (-1))
1697 && ((hstat.len == hstat.contlen) ||
1698 ((hstat.res == 0) &&
1699 ((hstat.contlen == -1) ||
1700 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1702 /* #### This code repeats in http.c and ftp.c. Move it to a
1704 const char *fl = NULL;
1705 if (opt.output_document)
1707 if (opt.od_known_regular)
1708 fl = opt.output_document;
1715 /* End of time-stamping section. */
1719 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1723 /* It is now safe to free the remainder of hstat, since the
1724 strings within it will no longer be used. */
1727 tmrate = rate (hstat.len - hstat.restval, hstat.dltime, 0);
1729 if (hstat.len == hstat.contlen)
1733 logprintf (LOG_VERBOSE,
1734 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1735 tms, tmrate, locf, hstat.len, hstat.contlen);
1736 logprintf (LOG_NONVERBOSE,
1737 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1738 tms, u->url, hstat.len, hstat.contlen, locf, count);
1741 downloaded_increase (hstat.len);
1743 /* Remember that we downloaded the file for later ".orig" code. */
1744 if (*dt & ADDED_HTML_EXTENSION)
1745 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1747 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1751 else if (hstat.res == 0) /* No read error */
1753 if (hstat.contlen == -1) /* We don't know how much we were supposed
1754 to get, so assume we succeeded. */
1758 logprintf (LOG_VERBOSE,
1759 _("%s (%s) - `%s' saved [%ld]\n\n"),
1760 tms, tmrate, locf, hstat.len);
1761 logprintf (LOG_NONVERBOSE,
1762 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1763 tms, u->url, hstat.len, 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);
1776 else if (hstat.len < hstat.contlen) /* meaning we lost the
1777 connection too soon */
1779 logprintf (LOG_VERBOSE,
1780 _("%s (%s) - Connection closed at byte %ld. "),
1781 tms, tmrate, hstat.len);
1782 printwhat (count, opt.ntry);
1785 else if (!opt.kill_longer) /* meaning we got more than expected */
1787 logprintf (LOG_VERBOSE,
1788 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1789 tms, tmrate, locf, hstat.len, hstat.contlen);
1790 logprintf (LOG_NONVERBOSE,
1791 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1792 tms, u->url, hstat.len, hstat.contlen, locf, count);
1794 downloaded_increase (hstat.len);
1796 /* Remember that we downloaded the file for later ".orig" code. */
1797 if (*dt & ADDED_HTML_EXTENSION)
1798 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1800 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1804 else /* the same, but not accepted */
1806 logprintf (LOG_VERBOSE,
1807 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1808 tms, tmrate, hstat.len, hstat.contlen);
1809 printwhat (count, opt.ntry);
1813 else /* now hstat.res can only be -1 */
1815 if (hstat.contlen == -1)
1817 logprintf (LOG_VERBOSE,
1818 _("%s (%s) - Read error at byte %ld (%s)."),
1819 tms, tmrate, hstat.len, strerror (errno));
1820 printwhat (count, opt.ntry);
1823 else /* hstat.res == -1 and contlen is given */
1825 logprintf (LOG_VERBOSE,
1826 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1827 tms, tmrate, hstat.len, hstat.contlen,
1829 printwhat (count, opt.ntry);
1836 while (!opt.ntry || (count < opt.ntry));
1840 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1841 than local timezone.
1843 mktime is similar but assumes struct tm, also known as the
1844 "broken-down" form of time, is in local time zone. mktime_from_utc
1845 uses mktime to make the conversion understanding that an offset
1846 will be introduced by the local time assumption.
1848 mktime_from_utc then measures the introduced offset by applying
1849 gmtime to the initial result and applying mktime to the resulting
1850 "broken-down" form. The difference between the two mktime results
1851 is the measured offset which is then subtracted from the initial
1852 mktime result to yield a calendar time which is the value returned.
1854 tm_isdst in struct tm is set to 0 to force mktime to introduce a
1855 consistent offset (the non DST offset) since tm and tm+o might be
1856 on opposite sides of a DST change.
1858 Some implementations of mktime return -1 for the nonexistent
1859 localtime hour at the beginning of DST. In this event, use
1860 mktime(tm - 1hr) + 3600.
1864 gmtime(t+o) --> tm+o
1865 mktime(tm+o) --> t+2o
1866 t+o - (t+2o - t+o) = t
1868 Note that glibc contains a function of the same purpose named
1869 `timegm' (reverse of gmtime). But obviously, it is not universally
1870 available, and unfortunately it is not straightforwardly
1871 extractable for use here. Perhaps configure should detect timegm
1872 and use it where available.
1874 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1875 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
1876 Further improved by Roger with assistance from Edward J. Sabol
1877 based on input by Jamie Zawinski. */
1880 mktime_from_utc (struct tm *t)
1891 return -1; /* can't deal with output from strptime */
1902 return -1; /* can't deal with output from gmtime */
1905 return (tl - (tb - tl));
1908 /* Check whether the result of strptime() indicates success.
1909 strptime() returns the pointer to how far it got to in the string.
1910 The processing has been successful if the string is at `GMT' or
1911 `+X', or at the end of the string.
1913 In extended regexp parlance, the function returns 1 if P matches
1914 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
1915 can return) is considered a failure and 0 is returned. */
1917 check_end (const char *p)
1921 while (ISSPACE (*p))
1924 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1925 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
1931 /* Convert the textual specification of time in TIME_STRING to the
1932 number of seconds since the Epoch.
1934 TIME_STRING can be in any of the three formats RFC2068 allows the
1935 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
1936 Timezones are ignored, and should be GMT.
1938 Return the computed time_t representation, or -1 if the conversion
1941 This function uses strptime with various string formats for parsing
1942 TIME_STRING. This results in a parser that is not as lenient in
1943 interpreting TIME_STRING as I would like it to be. Being based on
1944 strptime, it always allows shortened months, one-digit days, etc.,
1945 but due to the multitude of formats in which time can be
1946 represented, an ideal HTTP time parser would be even more
1947 forgiving. It should completely ignore things like week days and
1948 concentrate only on the various forms of representing years,
1949 months, days, hours, minutes, and seconds. For example, it would
1950 be nice if it accepted ISO 8601 out of the box.
1952 I've investigated free and PD code for this purpose, but none was
1953 usable. getdate was big and unwieldy, and had potential copyright
1954 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
1955 distributed with phttpd, is excellent, but we cannot use it because
1956 it is not assigned to the FSF. So I stuck it with strptime. */
1959 http_atotm (char *time_string)
1961 /* NOTE: Solaris strptime man page claims that %n and %t match white
1962 space, but that's not universally available. Instead, we simply
1963 use ` ' to mean "skip all WS", which works under all strptime
1964 implementations I've tested. */
1966 static const char *time_formats[] = {
1967 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1968 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
1969 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
1970 (google.com uses this for their cookies.) */
1971 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
1977 /* According to Roger Beeman, we need to initialize tm_isdst, since
1978 strptime won't do it. */
1981 /* Note that under foreign locales Solaris strptime() fails to
1982 recognize English dates, which renders this function useless. We
1983 solve this by being careful not to affect LC_TIME when
1984 initializing locale.
1986 Another solution would be to temporarily set locale to C, invoke
1987 strptime(), and restore it back. This is slow and dirty,
1988 however, and locale support other than LC_MESSAGES can mess other
1989 things, so I rather chose to stick with just setting LC_MESSAGES.
1991 GNU strptime does not have this problem because it recognizes
1992 both international and local dates. */
1994 for (i = 0; i < ARRAY_SIZE (time_formats); i++)
1995 if (check_end (strptime (time_string, time_formats[i], &t)))
1996 return mktime_from_utc (&t);
1998 /* All formats have failed. */
2002 /* Authorization support: We support two authorization schemes:
2004 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2006 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2007 consisting of answering to the server's challenge with the proper
2010 /* How many bytes it will take to store LEN bytes in base64. */
2011 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2013 /* Encode the string S of length LENGTH to base64 format and place it
2014 to STORE. STORE will be 0-terminated, and must point to a writable
2015 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2017 base64_encode (const char *s, char *store, int length)
2019 /* Conversion table. */
2020 static char tbl[64] = {
2021 'A','B','C','D','E','F','G','H',
2022 'I','J','K','L','M','N','O','P',
2023 'Q','R','S','T','U','V','W','X',
2024 'Y','Z','a','b','c','d','e','f',
2025 'g','h','i','j','k','l','m','n',
2026 'o','p','q','r','s','t','u','v',
2027 'w','x','y','z','0','1','2','3',
2028 '4','5','6','7','8','9','+','/'
2031 unsigned char *p = (unsigned char *)store;
2033 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2034 for (i = 0; i < length; i += 3)
2036 *p++ = tbl[s[0] >> 2];
2037 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2038 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2039 *p++ = tbl[s[2] & 0x3f];
2042 /* Pad the result if necessary... */
2043 if (i == length + 1)
2045 else if (i == length + 2)
2046 *(p - 1) = *(p - 2) = '=';
2047 /* ...and zero-terminate it. */
2051 /* Create the authentication header contents for the `Basic' scheme.
2052 This is done by encoding the string `USER:PASS' in base64 and
2053 prepending `HEADER: Basic ' to it. */
2055 basic_authentication_encode (const char *user, const char *passwd,
2058 char *t1, *t2, *res;
2059 int len1 = strlen (user) + 1 + strlen (passwd);
2060 int len2 = BASE64_LENGTH (len1);
2062 t1 = (char *)alloca (len1 + 1);
2063 sprintf (t1, "%s:%s", user, passwd);
2064 t2 = (char *)alloca (1 + len2);
2065 base64_encode (t1, t2, len1);
2066 res = (char *)xmalloc (len2 + 11 + strlen (header));
2067 sprintf (res, "%s: Basic %s\r\n", header, t2);
2073 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2074 of a field in such a header. If the field is the one specified by
2075 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2076 digest authorization code), extract its value in the (char*)
2077 variable pointed by RET. Returns negative on a malformed header,
2078 or number of bytes that have been parsed by this call. */
2080 extract_header_attr (const char *au, const char *attr_name, char **ret)
2082 const char *cp, *ep;
2086 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2088 cp += strlen (attr_name);
2091 cp += skip_lws (cp);
2096 cp += skip_lws (cp);
2101 for (ep = cp; *ep && *ep != '\"'; ep++)
2106 *ret = strdupdelim (cp, ep);
2113 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2114 an array of 16 bytes containing the hash keys, and BUF should be a
2115 buffer of 33 writable characters (32 for hex digits plus one for
2116 zero termination). */
2118 dump_hash (unsigned char *buf, const unsigned char *hash)
2122 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2124 *buf++ = XDIGIT_TO_xchar (*hash >> 4);
2125 *buf++ = XDIGIT_TO_xchar (*hash & 0xf);
2130 /* Take the line apart to find the challenge, and compose a digest
2131 authorization header. See RFC2069 section 2.1.2. */
2133 digest_authentication_encode (const char *au, const char *user,
2134 const char *passwd, const char *method,
2137 static char *realm, *opaque, *nonce;
2142 { "realm", &realm },
2143 { "opaque", &opaque },
2148 realm = opaque = nonce = NULL;
2150 au += 6; /* skip over `Digest' */
2155 au += skip_lws (au);
2156 for (i = 0; i < ARRAY_SIZE (options); i++)
2158 int skip = extract_header_attr (au, options[i].name,
2159 options[i].variable);
2163 FREE_MAYBE (opaque);
2173 if (i == ARRAY_SIZE (options))
2175 while (*au && *au != '=')
2179 au += skip_lws (au);
2183 while (*au && *au != '\"')
2190 while (*au && *au != ',')
2195 if (!realm || !nonce || !user || !passwd || !path || !method)
2198 FREE_MAYBE (opaque);
2203 /* Calculate the digest value. */
2206 unsigned char hash[MD5_HASHLEN];
2207 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2208 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2210 /* A1BUF = H(user ":" realm ":" password) */
2211 md5_init_ctx (&ctx);
2212 md5_process_bytes (user, strlen (user), &ctx);
2213 md5_process_bytes (":", 1, &ctx);
2214 md5_process_bytes (realm, strlen (realm), &ctx);
2215 md5_process_bytes (":", 1, &ctx);
2216 md5_process_bytes (passwd, strlen (passwd), &ctx);
2217 md5_finish_ctx (&ctx, hash);
2218 dump_hash (a1buf, hash);
2220 /* A2BUF = H(method ":" path) */
2221 md5_init_ctx (&ctx);
2222 md5_process_bytes (method, strlen (method), &ctx);
2223 md5_process_bytes (":", 1, &ctx);
2224 md5_process_bytes (path, strlen (path), &ctx);
2225 md5_finish_ctx (&ctx, hash);
2226 dump_hash (a2buf, hash);
2228 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2229 md5_init_ctx (&ctx);
2230 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
2231 md5_process_bytes (":", 1, &ctx);
2232 md5_process_bytes (nonce, strlen (nonce), &ctx);
2233 md5_process_bytes (":", 1, &ctx);
2234 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
2235 md5_finish_ctx (&ctx, hash);
2236 dump_hash (response_digest, hash);
2238 res = (char*) xmalloc (strlen (user)
2243 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2244 + (opaque ? strlen (opaque) : 0)
2246 sprintf (res, "Authorization: Digest \
2247 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2248 user, realm, nonce, path, response_digest);
2251 char *p = res + strlen (res);
2252 strcat (p, ", opaque=\"");
2256 strcat (res, "\r\n");
2260 #endif /* USE_DIGEST */
2263 #define BEGINS_WITH(line, string_constant) \
2264 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2265 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2266 || !line[sizeof (string_constant) - 1]))
2269 known_authentication_scheme_p (const char *au)
2271 return BEGINS_WITH (au, "Basic")
2272 || BEGINS_WITH (au, "Digest")
2273 || BEGINS_WITH (au, "NTLM");
2278 /* Create the HTTP authorization request header. When the
2279 `WWW-Authenticate' response header is seen, according to the
2280 authorization scheme specified in that header (`Basic' and `Digest'
2281 are supported by the current implementation), produce an
2282 appropriate HTTP authorization request header. */
2284 create_authorization_line (const char *au, const char *user,
2285 const char *passwd, const char *method,
2288 char *wwwauth = NULL;
2290 if (!strncasecmp (au, "Basic", 5))
2291 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2292 if (!strncasecmp (au, "NTLM", 4))
2293 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2295 else if (!strncasecmp (au, "Digest", 6))
2296 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2297 #endif /* USE_DIGEST */