2 Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
4 This file is part of Wget.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include <sys/types.h>
35 #if TIME_WITH_SYS_TIME
36 # include <sys/time.h>
40 # include <sys/time.h>
49 # include <netdb.h> /* for h_errno */
66 # include "gen_sslfunc.h"
70 extern char *version_string;
81 static int cookies_loaded_p;
83 #define TEXTHTML_S "text/html"
84 #define HTTP_ACCEPT "*/*"
86 /* Some status code validation macros: */
87 #define H_20X(x) (((x) >= 200) && ((x) < 300))
88 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
89 #define H_REDIRECTED(x) (((x) == HTTP_STATUS_MOVED_PERMANENTLY) \
90 || ((x) == HTTP_STATUS_MOVED_TEMPORARILY))
92 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
94 #define HTTP_STATUS_OK 200
95 #define HTTP_STATUS_CREATED 201
96 #define HTTP_STATUS_ACCEPTED 202
97 #define HTTP_STATUS_NO_CONTENT 204
98 #define HTTP_STATUS_PARTIAL_CONTENTS 206
100 /* Redirection 3xx. */
101 #define HTTP_STATUS_MULTIPLE_CHOICES 300
102 #define HTTP_STATUS_MOVED_PERMANENTLY 301
103 #define HTTP_STATUS_MOVED_TEMPORARILY 302
104 #define HTTP_STATUS_NOT_MODIFIED 304
106 /* Client error 4xx. */
107 #define HTTP_STATUS_BAD_REQUEST 400
108 #define HTTP_STATUS_UNAUTHORIZED 401
109 #define HTTP_STATUS_FORBIDDEN 403
110 #define HTTP_STATUS_NOT_FOUND 404
112 /* Server errors 5xx. */
113 #define HTTP_STATUS_INTERNAL 500
114 #define HTTP_STATUS_NOT_IMPLEMENTED 501
115 #define HTTP_STATUS_BAD_GATEWAY 502
116 #define HTTP_STATUS_UNAVAILABLE 503
119 /* Parse the HTTP status line, which is of format:
121 HTTP-Version SP Status-Code SP Reason-Phrase
123 The function returns the status-code, or -1 if the status line is
124 malformed. The pointer to reason-phrase is returned in RP. */
126 parse_http_status_line (const char *line, const char **reason_phrase_ptr)
128 /* (the variables must not be named `major' and `minor', because
129 that breaks compilation with SunOS4 cc.) */
130 int mjr, mnr, statcode;
133 *reason_phrase_ptr = NULL;
135 /* The standard format of HTTP-Version is: `HTTP/X.Y', where X is
136 major version, and Y is minor version. */
137 if (strncmp (line, "HTTP/", 5) != 0)
141 /* Calculate major HTTP version. */
143 for (mjr = 0; ISDIGIT (*line); line++)
144 mjr = 10 * mjr + (*line - '0');
145 if (*line != '.' || p == line)
149 /* Calculate minor HTTP version. */
151 for (mnr = 0; ISDIGIT (*line); line++)
152 mnr = 10 * mnr + (*line - '0');
153 if (*line != ' ' || p == line)
155 /* Wget will accept only 1.0 and higher HTTP-versions. The value of
156 minor version can be safely ignored. */
161 /* Calculate status code. */
162 if (!(ISDIGIT (*line) && ISDIGIT (line[1]) && ISDIGIT (line[2])))
164 statcode = 100 * (*line - '0') + 10 * (line[1] - '0') + (line[2] - '0');
166 /* Set up the reason phrase pointer. */
168 /* RFC2068 requires SPC here, but we allow the string to finish
169 here, in case no reason-phrase is present. */
173 *reason_phrase_ptr = line;
178 *reason_phrase_ptr = line + 1;
183 /* Functions to be used as arguments to header_process(): */
185 struct http_process_range_closure {
191 /* Parse the `Content-Range' header and extract the information it
192 contains. Returns 1 if successful, -1 otherwise. */
194 http_process_range (const char *hdr, void *arg)
196 struct http_process_range_closure *closure
197 = (struct http_process_range_closure *)arg;
200 /* Certain versions of Nutscape proxy server send out
201 `Content-Length' without "bytes" specifier, which is a breach of
202 RFC2068 (as well as the HTTP/1.1 draft which was current at the
203 time). But hell, I must support it... */
204 if (!strncasecmp (hdr, "bytes", 5))
207 hdr += skip_lws (hdr);
213 for (num = 0; ISDIGIT (*hdr); hdr++)
214 num = 10 * num + (*hdr - '0');
215 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
217 closure->first_byte_pos = num;
219 for (num = 0; ISDIGIT (*hdr); hdr++)
220 num = 10 * num + (*hdr - '0');
221 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
223 closure->last_byte_pos = num;
225 for (num = 0; ISDIGIT (*hdr); hdr++)
226 num = 10 * num + (*hdr - '0');
227 closure->entity_length = num;
231 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
232 Used for `Accept-Ranges'. */
234 http_process_none (const char *hdr, void *arg)
236 int *where = (int *)arg;
238 if (strstr (hdr, "none"))
245 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
247 http_process_type (const char *hdr, void *arg)
249 char **result = (char **)arg;
250 /* Locate P on `;' or the terminating zero, whichever comes first. */
251 const char *p = strchr (hdr, ';');
253 p = hdr + strlen (hdr);
254 while (p > hdr && ISSPACE (*(p - 1)))
256 *result = strdupdelim (hdr, p);
260 /* Check whether the `Connection' header is set to "keep-alive". */
262 http_process_connection (const char *hdr, void *arg)
264 int *flag = (int *)arg;
265 if (!strcasecmp (hdr, "Keep-Alive"))
270 /* Persistent connections. Currently, we cache the most recently used
271 connection as persistent, provided that the HTTP server agrees to
272 make it such. The persistence data is stored in the variables
273 below. Ideally, it would be in a structure, and it should be
274 possible to cache an arbitrary fixed number of these connections.
276 I think the code is quite easy to extend in that direction. */
278 /* Whether a persistent connection is active. */
279 static int pc_active_p;
280 /* Host and port of currently active persistent connection. */
281 static unsigned char pc_last_host[4];
282 static unsigned short pc_last_port;
284 /* File descriptor of the currently active persistent connection. */
285 static int pc_last_fd;
288 /* Whether a ssl handshake has occoured on this connection */
289 static int pc_active_ssl;
290 /* SSL connection of the currently active persistent connection. */
291 static SSL *pc_last_ssl;
292 #endif /* HAVE_SSL */
294 /* Mark the persistent connection as invalid. This is used by the
295 CLOSE_* macros after they forcefully close a registered persistent
296 connection. This does not close the file descriptor -- it is left
297 to the caller to do that. (Maybe it should, though.) */
300 invalidate_persistent (void)
305 #endif /* HAVE_SSL */
306 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
309 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
310 persistent. This will enable someone to use the same connection
311 later. In the context of HTTP, this must be called only AFTER the
312 response has been received and the server has promised that the
313 connection will remain alive.
315 If a previous connection was persistent, it is closed. */
318 register_persistent (const char *host, unsigned short port, int fd
328 if (pc_last_fd == fd)
330 /* The connection FD is already registered. Nothing to
336 /* The old persistent connection is still active; let's
337 close it first. This situation arises whenever a
338 persistent connection exists, but we then connect to a
339 different host, and try to register a persistent
340 connection to that one. */
342 /* The ssl disconnect has to take place before the closing
345 shutdown_ssl(pc_last_ssl);
348 invalidate_persistent ();
352 /* This store_hostaddress may not fail, because it has the results
354 success = store_hostaddress (pc_last_host, host);
361 pc_active_ssl = ssl ? 1 : 0;
363 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
366 /* Return non-zero if a persistent connection is available for
367 connecting to HOST:PORT. */
370 persistent_available_p (const char *host, unsigned short port
376 unsigned char this_host[4];
377 /* First, check whether a persistent connection is active at all. */
380 /* Second, check if the active connection pertains to the correct
381 (HOST, PORT) ordered pair. */
382 if (port != pc_last_port)
385 /* Second, a): check if current connection is (not) ssl, too. This
386 test is unlikely to fail because HTTP and HTTPS typicaly use
387 different ports. Yet it is possible, or so I [Christian
388 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
390 if (ssl != pc_active_ssl)
392 #endif /* HAVE_SSL */
393 if (!store_hostaddress (this_host, host))
395 if (memcmp (pc_last_host, this_host, 4))
397 /* Third: check whether the connection is still open. This is
398 important because most server implement a liberal (short) timeout
399 on persistent connections. Wget can of course always reconnect
400 if the connection doesn't work out, but it's nicer to know in
401 advance. This test is a logical followup of the first test, but
402 is "expensive" and therefore placed at the end of the list. */
403 if (!test_socket_open (pc_last_fd))
405 /* Oops, the socket is no longer open. Now that we know that,
406 let's invalidate the persistent connection before returning
409 invalidate_persistent ();
416 # define SHUTDOWN_SSL(ssl) do { \
418 shutdown_ssl (ssl); \
421 # define SHUTDOWN_SSL(ssl)
424 /* The idea behind these two CLOSE macros is to distinguish between
425 two cases: one when the job we've been doing is finished, and we
426 want to close the connection and leave, and two when something is
427 seriously wrong and we're closing the connection as part of
430 In case of keep_alive, CLOSE_FINISH should leave the connection
431 open, while CLOSE_INVALIDATE should still close it.
433 Note that the semantics of the flag `keep_alive' is "this
434 connection *will* be reused (the server has promised not to close
435 the connection once we're done)", while the semantics of
436 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
437 active, registered connection". */
439 #define CLOSE_FINISH(fd) do { \
442 SHUTDOWN_SSL (ssl); \
444 if (pc_active_p && (fd) == pc_last_fd) \
445 invalidate_persistent (); \
449 #define CLOSE_INVALIDATE(fd) do { \
450 SHUTDOWN_SSL (ssl); \
452 if (pc_active_p && (fd) == pc_last_fd) \
453 invalidate_persistent (); \
458 long len; /* received length */
459 long contlen; /* expected length */
460 long restval; /* the restart value */
461 int res; /* the result of last read */
462 char *newloc; /* new location (redirection) */
463 char *remote_time; /* remote time-stamp string */
464 char *error; /* textual HTTP error */
465 int statcode; /* status code */
466 long dltime; /* time of the download */
467 int no_truncate; /* whether truncating the file is
471 /* Free the elements of hstat X. */
472 #define FREEHSTAT(x) do \
474 FREE_MAYBE ((x).newloc); \
475 FREE_MAYBE ((x).remote_time); \
476 FREE_MAYBE ((x).error); \
477 (x).newloc = (x).remote_time = (x).error = NULL; \
480 static char *create_authorization_line PARAMS ((const char *, const char *,
481 const char *, const char *,
483 static char *basic_authentication_encode PARAMS ((const char *, const char *,
485 static int known_authentication_scheme_p PARAMS ((const char *));
487 time_t http_atotm PARAMS ((char *));
489 #define BEGINS_WITH(line, string_constant) \
490 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
491 && (ISSPACE (line[sizeof (string_constant) - 1]) \
492 || !line[sizeof (string_constant) - 1]))
494 /* Retrieve a document through HTTP protocol. It recognizes status
495 code, and correctly handles redirections. It closes the network
496 socket. If it receives an error from the functions below it, it
497 will print it if there is enough information to do so (almost
498 always), returning the error to the caller (i.e. http_loop).
500 Various HTTP parameters are stored to hs. Although it parses the
501 response code correctly, it is not used in a sane way. The caller
504 If u->proxy is non-NULL, the URL u will be taken as a proxy URL,
505 and u->proxy->url will be given to the proxy server (bad naming,
508 gethttp (struct urlinfo *u, struct http_stat *hs, int *dt)
510 char *request, *type, *command, *path;
512 char *pragma_h, *referer, *useragent, *range, *wwwauth, *remhost;
513 char *authenticate_h;
517 char *request_keep_alive;
518 int sock, hcount, num_written, all_length, remport, statcode;
519 long contlen, contrange;
523 int auth_tried_already;
526 static SSL_CTX *ssl_ctx = NULL;
528 #endif /* HAVE_SSL */
529 struct wget_timer *timer;
530 char *cookies = NULL;
532 /* Whether this connection will be kept alive after the HTTP request
536 /* Flags that detect the two ways of specifying HTTP keep-alive
538 int http_keep_alive_1, http_keep_alive_2;
540 /* Whether keep-alive should be inhibited. */
541 int inhibit_keep_alive;
544 /* initialize ssl_ctx on first run */
547 err=init_ssl (&ssl_ctx);
552 case SSLERRCTXCREATE:
554 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
558 /* try without certfile */
559 logprintf (LOG_NOTQUIET,
560 _("Failed to load certificates from %s\n"),
563 logprintf (LOG_NOTQUIET,
564 _("Trying without the specified certificate\n"));
567 logprintf (LOG_NOTQUIET,
568 _("Failed to get certificate key from %s\n"),
571 logprintf (LOG_NOTQUIET,
572 _("Trying without the specified certificate\n"));
579 #endif /* HAVE_SSL */
581 if (!(*dt & HEAD_ONLY))
582 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
583 know the local filename so we can save to it. */
584 assert (u->local != NULL);
587 auth_tried_already = 0;
589 inhibit_keep_alive = (!opt.http_keep_alive || u->proxy != NULL);
592 /* We need to come back here when the initial attempt to retrieve
593 without authorization header fails. (Expected to happen at least
594 for the Digest authorization scheme.) */
597 http_keep_alive_1 = http_keep_alive_2 = 0;
600 cookies = build_cookies_request (u->host, u->port, u->path,
601 u->proto == URLHTTPS);
603 /* Initialize certain elements of struct http_stat. */
608 hs->remote_time = NULL;
611 /* Which structure to use to retrieve the original URL data. */
617 /* First: establish the connection. */
618 if (inhibit_keep_alive
621 !persistent_available_p (u->host, u->port)
623 !persistent_available_p (u->host, u->port, (u->proto==URLHTTPS ? 1 : 0))
624 #endif /* HAVE_SSL */
627 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "), u->host, u->port);
628 err = make_connection (&sock, u->host, u->port);
632 logputs (LOG_VERBOSE, "\n");
633 logprintf (LOG_NOTQUIET, "%s: %s.\n", u->host, herrmsg (h_errno));
637 logputs (LOG_VERBOSE, "\n");
638 logprintf (LOG_NOTQUIET, "socket: %s\n", strerror (errno));
642 logputs (LOG_VERBOSE, "\n");
643 logprintf (LOG_NOTQUIET,
644 _("Connection to %s:%hu refused.\n"), u->host, u->port);
648 logputs (LOG_VERBOSE, "\n");
649 logprintf (LOG_NOTQUIET, "connect: %s\n", strerror (errno));
654 /* Everything is fine! */
655 logputs (LOG_VERBOSE, _("connected!\n"));
662 if (u->proto == URLHTTPS)
663 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
665 logputs (LOG_VERBOSE, "\n");
666 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
670 #endif /* HAVE_SSL */
674 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"), u->host, u->port);
675 /* #### pc_last_fd should be accessed through an accessor
680 #endif /* HAVE_SSL */
681 DEBUGP (("Reusing fd %d.\n", sock));
685 path = u->proxy->url;
689 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
693 referer = (char *)alloca (9 + strlen (ou->referer) + 3);
694 sprintf (referer, "Referer: %s\r\n", ou->referer);
696 if (*dt & SEND_NOCACHE)
697 pragma_h = "Pragma: no-cache\r\n";
702 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
703 /* Gag me! Some servers (e.g. WebSitePro) have been known to
704 respond to the following `Range' format by generating a
705 multipart/x-byte-ranges MIME document! This MIME type was
706 present in an old draft of the byteranges specification.
707 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
708 only if multiple non-overlapping ranges are requested --
709 which Wget never does. */
710 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
715 STRDUP_ALLOCA (useragent, opt.useragent);
718 useragent = (char *)alloca (10 + strlen (version_string));
719 sprintf (useragent, "Wget/%s", version_string);
721 /* Construct the authentication, if userid is present. */
724 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
725 user = user ? user : opt.http_user;
726 passwd = passwd ? passwd : opt.http_passwd;
733 /* We have the username and the password, but haven't tried
734 any authorization yet. Let's see if the "Basic" method
735 works. If not, we'll come back here and construct a
736 proper authorization method with the right challenges.
738 If we didn't employ this kind of logic, every URL that
739 requires authorization would have to be processed twice,
740 which is very suboptimal and generates a bunch of false
741 "unauthorized" errors in the server log.
743 #### But this logic also has a serious problem when used
744 with stronger authentications: we *first* transmit the
745 username and the password in clear text, and *then*
746 attempt a stronger authentication scheme. That cannot be
747 right! We are only fortunate that almost everyone still
748 uses the `Basic' scheme anyway.
750 There should be an option to prevent this from happening,
751 for those who use strong authentication schemes and value
753 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
757 wwwauth = create_authorization_line (authenticate_h, user, passwd,
765 char *proxy_user, *proxy_passwd;
766 /* For normal username and password, URL components override
767 command-line/wgetrc parameters. With proxy authentication,
768 it's the reverse, because proxy URLs are normally the
769 "permanent" ones, so command-line args should take
771 if (opt.proxy_user && opt.proxy_passwd)
773 proxy_user = opt.proxy_user;
774 proxy_passwd = opt.proxy_passwd;
778 proxy_user = u->user;
779 proxy_passwd = u->passwd;
781 /* #### This is junky. Can't the proxy request, say, `Digest'
783 if (proxy_user && proxy_passwd)
784 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
785 "Proxy-Authorization");
790 /* String of the form :PORT. Used only for non-standard ports. */
794 && remport != (u->proto == URLHTTPS
795 ? DEFAULT_HTTPS_PORT : DEFAULT_HTTP_PORT)
797 && remport != DEFAULT_HTTP_PORT
801 port_maybe = (char *)alloca (numdigit (remport) + 2);
802 sprintf (port_maybe, ":%d", remport);
805 if (!inhibit_keep_alive)
806 request_keep_alive = "Connection: Keep-Alive\r\n";
808 request_keep_alive = NULL;
810 /* Allocate the memory for the request. */
811 request = (char *)alloca (strlen (command) + strlen (path)
814 + (port_maybe ? strlen (port_maybe) : 0)
815 + strlen (HTTP_ACCEPT)
816 + (request_keep_alive
817 ? strlen (request_keep_alive) : 0)
818 + (referer ? strlen (referer) : 0)
819 + (cookies ? strlen (cookies) : 0)
820 + (wwwauth ? strlen (wwwauth) : 0)
821 + (proxyauth ? strlen (proxyauth) : 0)
822 + (range ? strlen (range) : 0)
824 + (opt.user_header ? strlen (opt.user_header) : 0)
826 /* Construct the request. */
832 %s%s%s%s%s%s%s%s\r\n",
833 command, path, useragent, remhost,
834 port_maybe ? port_maybe : "",
836 request_keep_alive ? request_keep_alive : "",
837 referer ? referer : "",
838 cookies ? cookies : "",
839 wwwauth ? wwwauth : "",
840 proxyauth ? proxyauth : "",
843 opt.user_header ? opt.user_header : "");
844 DEBUGP (("---request begin---\n%s---request end---\n", request));
845 /* Free the temporary memory. */
846 FREE_MAYBE (wwwauth);
847 FREE_MAYBE (proxyauth);
848 FREE_MAYBE (cookies);
850 /* Send the request to server. */
852 if (u->proto == URLHTTPS)
853 num_written = ssl_iwrite (ssl, request, strlen (request));
855 #endif /* HAVE_SSL */
856 num_written = iwrite (sock, request, strlen (request));
860 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
862 CLOSE_INVALIDATE (sock);
865 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
866 u->proxy ? "Proxy" : "HTTP");
867 contlen = contrange = -1;
872 /* Before reading anything, initialize the rbuf. */
873 rbuf_initialize (&rbuf, sock);
875 if (u->proto == URLHTTPS)
879 #endif /* HAVE_SSL */
882 /* Header-fetching loop. */
890 /* Get the header. */
891 status = header_get (&rbuf, &hdr,
892 /* Disallow continuations for status line. */
893 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
895 /* Check for errors. */
896 if (status == HG_EOF && *hdr)
898 /* This used to be an unconditional error, but that was
899 somewhat controversial, because of a large number of
900 broken CGI's that happily "forget" to send the second EOL
901 before closing the connection of a HEAD request.
903 So, the deal is to check whether the header is empty
904 (*hdr is zero if it is); if yes, it means that the
905 previous header was fully retrieved, and that -- most
906 probably -- the request is complete. "...be liberal in
907 what you accept." Oh boy. */
908 logputs (LOG_VERBOSE, "\n");
909 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
912 FREE_MAYBE (hs->newloc);
913 FREE_MAYBE (all_headers);
914 CLOSE_INVALIDATE (sock);
917 else if (status == HG_ERROR)
919 logputs (LOG_VERBOSE, "\n");
920 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
924 FREE_MAYBE (hs->newloc);
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 /* Print the header if requested. */
943 if (opt.server_response && hcount != 1)
944 logprintf (LOG_VERBOSE, "\n%d %s", hcount, hdr);
946 /* Check for status line. */
950 /* Parse the first line of server response. */
951 statcode = parse_http_status_line (hdr, &error);
952 hs->statcode = statcode;
953 /* Store the descriptive response. */
954 if (statcode == -1) /* malformed response */
956 /* A common reason for "malformed response" error is the
957 case when no data was actually received. Handle this
960 hs->error = xstrdup (_("No data received"));
962 hs->error = xstrdup (_("Malformed status line"));
967 hs->error = xstrdup (_("(no description)"));
969 hs->error = xstrdup (error);
976 logprintf (LOG_VERBOSE, "%d %s", statcode, error);
981 /* Exit on empty header. */
988 /* Try getting content-length. */
989 if (contlen == -1 && !opt.ignore_length)
990 if (header_process (hdr, "Content-Length", header_extract_number,
993 /* Try getting content-type. */
995 if (header_process (hdr, "Content-Type", http_process_type, &type))
997 /* Try getting location. */
999 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1001 /* Try getting last-modified. */
1002 if (!hs->remote_time)
1003 if (header_process (hdr, "Last-Modified", header_strdup,
1006 /* Try getting cookies. */
1008 if (header_process (hdr, "Set-Cookie", set_cookie_header_cb, u))
1010 /* Try getting www-authentication. */
1011 if (!authenticate_h)
1012 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1015 /* Check for accept-ranges header. If it contains the word
1016 `none', disable the ranges. */
1017 if (*dt & ACCEPTRANGES)
1020 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1023 *dt &= ~ACCEPTRANGES;
1027 /* Try getting content-range. */
1028 if (contrange == -1)
1030 struct http_process_range_closure closure;
1031 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1033 contrange = closure.first_byte_pos;
1037 /* Check for keep-alive related responses. */
1038 if (!inhibit_keep_alive)
1040 /* Check for the `Keep-Alive' header. */
1041 if (!http_keep_alive_1)
1043 if (header_process (hdr, "Keep-Alive", header_exists,
1044 &http_keep_alive_1))
1047 /* Check for `Connection: Keep-Alive'. */
1048 if (!http_keep_alive_2)
1050 if (header_process (hdr, "Connection", http_process_connection,
1051 &http_keep_alive_2))
1059 logputs (LOG_VERBOSE, "\n");
1062 && (http_keep_alive_1 || http_keep_alive_2))
1064 assert (inhibit_keep_alive == 0);
1068 /* The server has promised that it will not close the connection
1069 when we're done. This means that we can register it. */
1071 register_persistent (u->host, u->port, sock);
1073 register_persistent (u->host, u->port, sock, ssl);
1074 #endif /* HAVE_SSL */
1076 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1079 /* Authorization is required. */
1083 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1084 might be more bytes in the body. */
1085 if (auth_tried_already)
1087 /* If we have tried it already, then there is not point
1090 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1091 xfree (authenticate_h);
1094 else if (!known_authentication_scheme_p (authenticate_h))
1096 xfree (authenticate_h);
1097 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1100 else if (BEGINS_WITH (authenticate_h, "Basic"))
1102 /* The authentication scheme is basic, the one we try by
1103 default, and it failed. There's no sense in trying
1109 auth_tried_already = 1;
1113 /* We do not need this anymore. */
1116 xfree (authenticate_h);
1117 authenticate_h = NULL;
1120 /* 20x responses are counted among successful by default. */
1121 if (H_20X (statcode))
1124 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
1127 /* We don't assume text/html by default. */
1130 if (opt.html_extension && (*dt & TEXTHTML))
1131 /* -E / --html-extension / html_extension = on was specified, and this is a
1132 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1133 already the file's suffix, tack on ".html". */
1135 char* last_period_in_local_filename = strrchr(u->local, '.');
1137 if (last_period_in_local_filename == NULL ||
1138 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
1139 strcasecmp(last_period_in_local_filename, ".html") == EQ))
1141 size_t local_filename_len = strlen(u->local);
1143 u->local = xrealloc(u->local, local_filename_len + sizeof(".html"));
1144 strcpy(u->local + local_filename_len, ".html");
1146 *dt |= ADDED_HTML_EXTENSION;
1150 if (contrange == -1)
1152 /* We did not get a content-range header. This means that the
1153 server did not honor our `Range' request. Normally, this
1154 means we should reset hs->restval and continue normally. */
1156 /* However, if `-c' is used, we need to be a bit more careful:
1158 1. If `-c' is specified and the file already existed when
1159 Wget was started, it would be a bad idea for us to start
1160 downloading it from scratch, effectively truncating it. I
1161 believe this cannot happen unless `-c' was specified.
1163 2. If `-c' is used on a file that is already fully
1164 downloaded, we're requesting bytes after the end of file,
1165 which can result in server not honoring `Range'. If this is
1166 the case, `Content-Length' will be equal to the length of the
1168 if (opt.always_rest)
1170 /* Check for condition #2. */
1171 if (hs->restval == contlen)
1173 logputs (LOG_VERBOSE, _("\
1174 \n The file is already fully retrieved; nothing to do.\n\n"));
1175 /* In case the caller inspects. */
1179 FREE_MAYBE (hs->newloc);
1180 FREE_MAYBE (all_headers);
1181 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1182 might be more bytes in the body. */
1183 return RETRFINISHED;
1186 /* Check for condition #1. */
1187 if (hs->no_truncate)
1189 logprintf (LOG_NOTQUIET,
1192 The server does not support continued download;\n\
1193 refusing to truncate `%s'.\n\n"), u->local);
1194 return CONTNOTSUPPORTED;
1203 else if (contrange != hs->restval ||
1204 (H_PARTIAL (statcode) && contrange == -1))
1206 /* This means the whole request was somehow misunderstood by the
1207 server. Bail out. */
1209 FREE_MAYBE (hs->newloc);
1210 FREE_MAYBE (all_headers);
1211 CLOSE_INVALIDATE (sock);
1218 contlen += contrange;
1220 contrange = -1; /* If conent-length was not sent,
1221 content-range will be ignored. */
1223 hs->contlen = contlen;
1225 /* Return if redirected. */
1226 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1228 /* RFC2068 says that in case of the 300 (multiple choices)
1229 response, the server can output a preferred URL through
1230 `Location' header; otherwise, the request should be treated
1231 like GET. So, if the location is set, it will be a
1232 redirection; otherwise, just proceed normally. */
1233 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1237 logprintf (LOG_VERBOSE,
1238 _("Location: %s%s\n"),
1239 hs->newloc ? hs->newloc : _("unspecified"),
1240 hs->newloc ? _(" [following]") : "");
1241 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1242 might be more bytes in the body. */
1244 FREE_MAYBE (all_headers);
1250 if ((*dt & RETROKF) && !opt.server_response)
1252 /* No need to print this output if the body won't be
1253 downloaded at all, or if the original server response is
1255 logputs (LOG_VERBOSE, _("Length: "));
1258 logputs (LOG_VERBOSE, legible (contlen));
1259 if (contrange != -1)
1260 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1261 legible (contlen - contrange));
1264 logputs (LOG_VERBOSE,
1265 opt.ignore_length ? _("ignored") : _("unspecified"));
1267 logprintf (LOG_VERBOSE, " [%s]\n", type);
1269 logputs (LOG_VERBOSE, "\n");
1273 type = NULL; /* We don't need it any more. */
1275 /* Return if we have no intention of further downloading. */
1276 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1278 /* In case the caller cares to look... */
1282 FREE_MAYBE (all_headers);
1283 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1284 might be more bytes in the body. */
1285 return RETRFINISHED;
1288 /* Open the local file. */
1291 mkalldirs (u->local);
1293 rotate_backups (u->local);
1294 fp = fopen (u->local, hs->restval ? "ab" : "wb");
1297 logprintf (LOG_NOTQUIET, "%s: %s\n", u->local, strerror (errno));
1298 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1299 might be more bytes in the body. */
1300 FREE_MAYBE (all_headers);
1306 extern int global_download_count;
1308 /* To ensure that repeated "from scratch" downloads work for -O
1309 files, we rewind the file pointer, unless restval is
1310 non-zero. (This works only when -O is used on regular files,
1311 but it's still a valuable feature.)
1313 However, this loses when more than one URL is specified on
1314 the command line the second rewinds eradicates the contents
1315 of the first download. Thus we disable the above trick for
1316 all the downloads except the very first one.
1318 #### A possible solution to this would be to remember the
1319 file position in the output document and to seek to that
1320 position, instead of rewinding. */
1321 if (!hs->restval && global_download_count == 0)
1323 /* This will silently fail for streams that don't correspond
1324 to regular files, but that's OK. */
1326 /* ftruncate is needed because opt.dfp is opened in append
1327 mode if opt.always_rest is set. */
1328 ftruncate (fileno (fp), 0);
1333 /* #### This confuses the code that checks for file size. There
1334 should be some overhead information. */
1335 if (opt.save_headers)
1336 fwrite (all_headers, 1, all_length, fp);
1337 timer = wtimer_new ();
1338 /* Get the contents of the document. */
1339 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1340 (contlen != -1 ? contlen : 0),
1342 hs->dltime = wtimer_elapsed (timer);
1343 wtimer_delete (timer);
1345 /* Close or flush the file. We have to be careful to check for
1346 error here. Checking the result of fwrite() is not enough --
1347 errors could go unnoticed! */
1350 flush_res = fclose (fp);
1352 flush_res = fflush (fp);
1353 if (flush_res == EOF)
1356 FREE_MAYBE (all_headers);
1357 CLOSE_FINISH (sock);
1360 return RETRFINISHED;
1363 /* The genuine HTTP loop! This is the part where the retrieval is
1364 retried, and retried, and retried, and... */
1366 http_loop (struct urlinfo *u, char **newloc, int *dt)
1369 int use_ts, got_head = 0; /* time-stamping info */
1370 char *filename_plus_orig_suffix;
1371 char *local_filename = NULL;
1372 char *tms, *suf, *locf, *tmrate;
1374 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1375 long local_size = 0; /* the size of the local file */
1376 size_t filename_len;
1377 struct http_stat hstat; /* HTTP status */
1380 /* This used to be done in main(), but it's a better idea to do it
1381 here so that we don't go through the hoops if we're just using
1383 if (opt.cookies && opt.cookies_input && !cookies_loaded_p)
1385 load_cookies (opt.cookies_input);
1386 cookies_loaded_p = 1;
1391 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1392 has_wildcards_p because it would also warn on `?', and we know that
1393 shows up in CGI paths a *lot*. */
1394 if (strchr (u->url, '*'))
1395 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1397 /* Determine the local filename. */
1399 u->local = url_filename (u->proxy ? u->proxy : u);
1401 if (!opt.output_document)
1404 locf = opt.output_document;
1406 /* Yuck. Multiple returns suck. We need to remember to free() the space we
1407 xmalloc() here before EACH return. This is one reason it's better to set
1408 flags that influence flow control and then return once at the end. */
1409 filename_len = strlen(u->local);
1410 filename_plus_orig_suffix = xmalloc(filename_len + sizeof(".orig"));
1412 if (opt.noclobber && file_exists_p (u->local))
1414 /* If opt.noclobber is turned on and file already exists, do not
1415 retrieve the file */
1416 logprintf (LOG_VERBOSE, _("\
1417 File `%s' already there, will not retrieve.\n"), u->local);
1418 /* If the file is there, we suppose it's retrieved OK. */
1421 /* #### Bogusness alert. */
1422 /* If its suffix is "html" or (yuck!) "htm", we suppose it's
1423 text/html, a harmless lie. */
1424 if (((suf = suffix (u->local)) != NULL)
1425 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
1428 xfree (filename_plus_orig_suffix); /* must precede every return! */
1429 /* Another harmless lie: */
1434 if (opt.timestamping)
1436 boolean local_dot_orig_file_exists = FALSE;
1438 if (opt.backup_converted)
1439 /* If -K is specified, we'll act on the assumption that it was specified
1440 last time these files were downloaded as well, and instead of just
1441 comparing local file X against server file X, we'll compare local
1442 file X.orig (if extant, else X) against server file X. If -K
1443 _wasn't_ specified last time, or the server contains files called
1444 *.orig, -N will be back to not operating correctly with -k. */
1446 /* Would a single s[n]printf() call be faster? --dan
1448 Definitely not. sprintf() is horribly slow. It's a
1449 different question whether the difference between the two
1450 affects a program. Usually I'd say "no", but at one
1451 point I profiled Wget, and found that a measurable and
1452 non-negligible amount of time was lost calling sprintf()
1453 in url.c. Replacing sprintf with inline calls to
1454 strcpy() and long_to_string() made a difference.
1456 strcpy(filename_plus_orig_suffix, u->local);
1457 strcpy(filename_plus_orig_suffix + filename_len, ".orig");
1459 /* Try to stat() the .orig file. */
1460 if (stat(filename_plus_orig_suffix, &st) == 0)
1462 local_dot_orig_file_exists = TRUE;
1463 local_filename = filename_plus_orig_suffix;
1467 if (!local_dot_orig_file_exists)
1468 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1469 if (stat (u->local, &st) == 0)
1470 local_filename = u->local;
1472 if (local_filename != NULL)
1473 /* There was a local file, so we'll check later to see if the version
1474 the server has is the same version we already have, allowing us to
1479 local_size = st.st_size;
1483 /* Reset the counter. */
1485 *dt = 0 | ACCEPTRANGES;
1489 /* Increment the pass counter. */
1491 sleep_between_retrievals (count);
1492 /* Get the current time string. */
1493 tms = time_str (NULL);
1494 /* Print fetch message, if opt.verbose. */
1497 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1501 sprintf (tmp, _("(try:%2d)"), count);
1502 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1503 tms, hurl, tmp, locf);
1505 ws_changetitle (hurl, 1);
1510 /* Default document type is empty. However, if spider mode is
1511 on or time-stamping is employed, HEAD_ONLY commands is
1512 encoded within *dt. */
1513 if (opt.spider || (use_ts && !got_head))
1517 /* Assume no restarting. */
1519 /* Decide whether or not to restart. */
1520 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1521 && file_exists_p (locf))
1522 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1523 hstat.restval = st.st_size;
1525 /* Decide whether to send the no-cache directive. We send it in
1527 a) we're using a proxy, and we're past our first retrieval.
1528 Some proxies are notorious for caching incomplete data, so
1529 we require a fresh get.
1530 b) caching is explicitly inhibited. */
1531 if ((u->proxy && count > 1) /* a */
1532 || !opt.allow_cache /* b */
1534 *dt |= SEND_NOCACHE;
1536 *dt &= ~SEND_NOCACHE;
1538 /* Try fetching the document, or at least its head. :-) */
1539 err = gethttp (u, &hstat, dt);
1541 /* It's unfortunate that wget determines the local filename before finding
1542 out the Content-Type of the file. Barring a major restructuring of the
1543 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1544 u->local to tack on ".html". */
1545 if (!opt.output_document)
1548 locf = opt.output_document;
1550 /* In `-c' is used, check whether the file we're writing to
1551 exists before we've done anything. If so, we'll refuse to
1552 truncate it if the server doesn't support continued
1554 if (opt.always_rest)
1555 hstat.no_truncate = file_exists_p (locf);
1558 tms = time_str (NULL);
1559 /* Get the new location (with or without the redirection). */
1561 *newloc = xstrdup (hstat.newloc);
1564 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1565 case CONERROR: case READERR: case WRITEFAILED:
1567 /* Non-fatal errors continue executing the loop, which will
1568 bring them to "while" statement at the end, to judge
1569 whether the number of tries was exceeded. */
1571 printwhat (count, opt.ntry);
1574 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1575 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1576 /* Fatal errors just return from the function. */
1578 xfree (filename_plus_orig_suffix); /* must precede every return! */
1581 case FWRITEERR: case FOPENERR:
1582 /* Another fatal error. */
1583 logputs (LOG_VERBOSE, "\n");
1584 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1585 u->local, strerror (errno));
1590 /* Another fatal error. */
1591 logputs (LOG_VERBOSE, "\n");
1592 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1594 xfree (filename_plus_orig_suffix); /* must precede every return! */
1598 /* Return the new location to the caller. */
1601 logprintf (LOG_NOTQUIET,
1602 _("ERROR: Redirection (%d) without location.\n"),
1604 xfree (filename_plus_orig_suffix); /* must precede every return! */
1608 xfree (filename_plus_orig_suffix); /* must precede every return! */
1612 /* Deal with you later. */
1615 /* All possibilities should have been exhausted. */
1618 if (!(*dt & RETROKF))
1622 /* #### Ugly ugly ugly! */
1623 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1624 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1627 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1628 tms, hstat.statcode, hstat.error);
1629 logputs (LOG_VERBOSE, "\n");
1631 xfree (filename_plus_orig_suffix); /* must precede every return! */
1635 /* Did we get the time-stamp? */
1638 if (opt.timestamping && !hstat.remote_time)
1640 logputs (LOG_NOTQUIET, _("\
1641 Last-modified header missing -- time-stamps turned off.\n"));
1643 else if (hstat.remote_time)
1645 /* Convert the date-string into struct tm. */
1646 tmr = http_atotm (hstat.remote_time);
1647 if (tmr == (time_t) (-1))
1648 logputs (LOG_VERBOSE, _("\
1649 Last-modified header invalid -- time-stamp ignored.\n"));
1653 /* The time-stamping section. */
1658 use_ts = 0; /* no more time-stamping */
1659 count = 0; /* the retrieve count for HEAD is
1661 if (hstat.remote_time && tmr != (time_t) (-1))
1663 /* Now time-stamping can be used validly. Time-stamping
1664 means that if the sizes of the local and remote file
1665 match, and local file is newer than the remote file,
1666 it will not be retrieved. Otherwise, the normal
1667 download procedure is resumed. */
1669 (hstat.contlen == -1 || local_size == hstat.contlen))
1671 logprintf (LOG_VERBOSE, _("\
1672 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1675 xfree (filename_plus_orig_suffix); /*must precede every return!*/
1678 else if (tml >= tmr)
1679 logprintf (LOG_VERBOSE, _("\
1680 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1682 logputs (LOG_VERBOSE,
1683 _("Remote file is newer, retrieving.\n"));
1688 if ((tmr != (time_t) (-1))
1690 && ((hstat.len == hstat.contlen) ||
1691 ((hstat.res == 0) &&
1692 ((hstat.contlen == -1) ||
1693 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1695 /* #### This code repeats in http.c and ftp.c. Move it to a
1697 const char *fl = NULL;
1698 if (opt.output_document)
1700 if (opt.od_known_regular)
1701 fl = opt.output_document;
1708 /* End of time-stamping section. */
1712 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1713 xfree (filename_plus_orig_suffix); /* must precede every return! */
1717 /* It is now safe to free the remainder of hstat, since the
1718 strings within it will no longer be used. */
1721 tmrate = rate (hstat.len - hstat.restval, hstat.dltime, 0);
1723 if (hstat.len == hstat.contlen)
1727 logprintf (LOG_VERBOSE,
1728 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1729 tms, tmrate, locf, hstat.len, hstat.contlen);
1730 logprintf (LOG_NONVERBOSE,
1731 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1732 tms, u->url, hstat.len, hstat.contlen, locf, count);
1735 downloaded_increase (hstat.len);
1737 /* Remember that we downloaded the file for later ".orig" code. */
1738 if (*dt & ADDED_HTML_EXTENSION)
1739 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1741 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1743 xfree(filename_plus_orig_suffix); /* must precede every return! */
1746 else if (hstat.res == 0) /* No read error */
1748 if (hstat.contlen == -1) /* We don't know how much we were supposed
1749 to get, so assume we succeeded. */
1753 logprintf (LOG_VERBOSE,
1754 _("%s (%s) - `%s' saved [%ld]\n\n"),
1755 tms, tmrate, locf, hstat.len);
1756 logprintf (LOG_NONVERBOSE,
1757 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1758 tms, u->url, hstat.len, locf, count);
1761 downloaded_increase (hstat.len);
1763 /* Remember that we downloaded the file for later ".orig" code. */
1764 if (*dt & ADDED_HTML_EXTENSION)
1765 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1767 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1769 xfree (filename_plus_orig_suffix); /* must precede every return! */
1772 else if (hstat.len < hstat.contlen) /* meaning we lost the
1773 connection too soon */
1775 logprintf (LOG_VERBOSE,
1776 _("%s (%s) - Connection closed at byte %ld. "),
1777 tms, tmrate, hstat.len);
1778 printwhat (count, opt.ntry);
1781 else if (!opt.kill_longer) /* meaning we got more than expected */
1783 logprintf (LOG_VERBOSE,
1784 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1785 tms, tmrate, locf, hstat.len, hstat.contlen);
1786 logprintf (LOG_NONVERBOSE,
1787 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1788 tms, u->url, hstat.len, hstat.contlen, locf, count);
1790 downloaded_increase (hstat.len);
1792 /* Remember that we downloaded the file for later ".orig" code. */
1793 if (*dt & ADDED_HTML_EXTENSION)
1794 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1796 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1798 xfree (filename_plus_orig_suffix); /* must precede every return! */
1801 else /* the same, but not accepted */
1803 logprintf (LOG_VERBOSE,
1804 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1805 tms, tmrate, hstat.len, hstat.contlen);
1806 printwhat (count, opt.ntry);
1810 else /* now hstat.res can only be -1 */
1812 if (hstat.contlen == -1)
1814 logprintf (LOG_VERBOSE,
1815 _("%s (%s) - Read error at byte %ld (%s)."),
1816 tms, tmrate, hstat.len, strerror (errno));
1817 printwhat (count, opt.ntry);
1820 else /* hstat.res == -1 and contlen is given */
1822 logprintf (LOG_VERBOSE,
1823 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1824 tms, tmrate, hstat.len, hstat.contlen,
1826 printwhat (count, opt.ntry);
1833 while (!opt.ntry || (count < opt.ntry));
1834 xfree (filename_plus_orig_suffix); /* must precede every return! */
1838 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1839 than local timezone.
1841 mktime is similar but assumes struct tm, also known as the
1842 "broken-down" form of time, is in local time zone. mktime_from_utc
1843 uses mktime to make the conversion understanding that an offset
1844 will be introduced by the local time assumption.
1846 mktime_from_utc then measures the introduced offset by applying
1847 gmtime to the initial result and applying mktime to the resulting
1848 "broken-down" form. The difference between the two mktime results
1849 is the measured offset which is then subtracted from the initial
1850 mktime result to yield a calendar time which is the value returned.
1852 tm_isdst in struct tm is set to 0 to force mktime to introduce a
1853 consistent offset (the non DST offset) since tm and tm+o might be
1854 on opposite sides of a DST change.
1856 Some implementations of mktime return -1 for the nonexistent
1857 localtime hour at the beginning of DST. In this event, use
1858 mktime(tm - 1hr) + 3600.
1862 gmtime(t+o) --> tm+o
1863 mktime(tm+o) --> t+2o
1864 t+o - (t+2o - t+o) = t
1866 Note that glibc contains a function of the same purpose named
1867 `timegm' (reverse of gmtime). But obviously, it is not universally
1868 available, and unfortunately it is not straightforwardly
1869 extractable for use here. Perhaps configure should detect timegm
1870 and use it where available.
1872 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1873 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
1874 Further improved by Roger with assistance from Edward J. Sabol
1875 based on input by Jamie Zawinski. */
1878 mktime_from_utc (struct tm *t)
1889 return -1; /* can't deal with output from strptime */
1900 return -1; /* can't deal with output from gmtime */
1903 return (tl - (tb - tl));
1906 /* Check whether the result of strptime() indicates success.
1907 strptime() returns the pointer to how far it got to in the string.
1908 The processing has been successful if the string is at `GMT' or
1909 `+X', or at the end of the string.
1911 In extended regexp parlance, the function returns 1 if P matches
1912 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
1913 can return) is considered a failure and 0 is returned. */
1915 check_end (const char *p)
1919 while (ISSPACE (*p))
1922 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1923 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
1929 /* Convert the textual specification of time in TIME_STRING to the
1930 number of seconds since the Epoch.
1932 TIME_STRING can be in any of the three formats RFC2068 allows the
1933 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
1934 Timezones are ignored, and should be GMT.
1936 Return the computed time_t representation, or -1 if the conversion
1939 This function uses strptime with various string formats for parsing
1940 TIME_STRING. This results in a parser that is not as lenient in
1941 interpreting TIME_STRING as I would like it to be. Being based on
1942 strptime, it always allows shortened months, one-digit days, etc.,
1943 but due to the multitude of formats in which time can be
1944 represented, an ideal HTTP time parser would be even more
1945 forgiving. It should completely ignore things like week days and
1946 concentrate only on the various forms of representing years,
1947 months, days, hours, minutes, and seconds. For example, it would
1948 be nice if it accepted ISO 8601 out of the box.
1950 I've investigated free and PD code for this purpose, but none was
1951 usable. getdate was big and unwieldy, and had potential copyright
1952 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
1953 distributed with phttpd, is excellent, but we cannot use it because
1954 it is not assigned to the FSF. So I stuck it with strptime. */
1957 http_atotm (char *time_string)
1959 /* NOTE: Solaris strptime man page claims that %n and %t match white
1960 space, but that's not universally available. Instead, we simply
1961 use ` ' to mean "skip all WS", which works under all strptime
1962 implementations I've tested. */
1964 static const char *time_formats[] = {
1965 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1966 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
1967 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
1968 (google.com uses this for their cookies.) */
1969 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
1975 /* According to Roger Beeman, we need to initialize tm_isdst, since
1976 strptime won't do it. */
1979 /* Note that under foreign locales Solaris strptime() fails to
1980 recognize English dates, which renders this function useless. We
1981 solve this by being careful not to affect LC_TIME when
1982 initializing locale.
1984 Another solution would be to temporarily set locale to C, invoke
1985 strptime(), and restore it back. This is slow and dirty,
1986 however, and locale support other than LC_MESSAGES can mess other
1987 things, so I rather chose to stick with just setting LC_MESSAGES.
1989 GNU strptime does not have this problem because it recognizes
1990 both international and local dates. */
1992 for (i = 0; i < ARRAY_SIZE (time_formats); i++)
1993 if (check_end (strptime (time_string, time_formats[i], &t)))
1994 return mktime_from_utc (&t);
1996 /* All formats have failed. */
2000 /* Authorization support: We support two authorization schemes:
2002 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2004 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2005 consisting of answering to the server's challenge with the proper
2008 /* How many bytes it will take to store LEN bytes in base64. */
2009 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2011 /* Encode the string S of length LENGTH to base64 format and place it
2012 to STORE. STORE will be 0-terminated, and must point to a writable
2013 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2015 base64_encode (const char *s, char *store, int length)
2017 /* Conversion table. */
2018 static char tbl[64] = {
2019 'A','B','C','D','E','F','G','H',
2020 'I','J','K','L','M','N','O','P',
2021 'Q','R','S','T','U','V','W','X',
2022 'Y','Z','a','b','c','d','e','f',
2023 'g','h','i','j','k','l','m','n',
2024 'o','p','q','r','s','t','u','v',
2025 'w','x','y','z','0','1','2','3',
2026 '4','5','6','7','8','9','+','/'
2029 unsigned char *p = (unsigned char *)store;
2031 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2032 for (i = 0; i < length; i += 3)
2034 *p++ = tbl[s[0] >> 2];
2035 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2036 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2037 *p++ = tbl[s[2] & 0x3f];
2040 /* Pad the result if necessary... */
2041 if (i == length + 1)
2043 else if (i == length + 2)
2044 *(p - 1) = *(p - 2) = '=';
2045 /* ...and zero-terminate it. */
2049 /* Create the authentication header contents for the `Basic' scheme.
2050 This is done by encoding the string `USER:PASS' in base64 and
2051 prepending `HEADER: Basic ' to it. */
2053 basic_authentication_encode (const char *user, const char *passwd,
2056 char *t1, *t2, *res;
2057 int len1 = strlen (user) + 1 + strlen (passwd);
2058 int len2 = BASE64_LENGTH (len1);
2060 t1 = (char *)alloca (len1 + 1);
2061 sprintf (t1, "%s:%s", user, passwd);
2062 t2 = (char *)alloca (1 + len2);
2063 base64_encode (t1, t2, len1);
2064 res = (char *)xmalloc (len2 + 11 + strlen (header));
2065 sprintf (res, "%s: Basic %s\r\n", header, t2);
2071 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2072 of a field in such a header. If the field is the one specified by
2073 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2074 digest authorization code), extract its value in the (char*)
2075 variable pointed by RET. Returns negative on a malformed header,
2076 or number of bytes that have been parsed by this call. */
2078 extract_header_attr (const char *au, const char *attr_name, char **ret)
2080 const char *cp, *ep;
2084 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2086 cp += strlen (attr_name);
2089 cp += skip_lws (cp);
2094 cp += skip_lws (cp);
2099 for (ep = cp; *ep && *ep != '\"'; ep++)
2104 *ret = strdupdelim (cp, ep);
2111 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2112 an array of 16 bytes containing the hash keys, and BUF should be a
2113 buffer of 33 writable characters (32 for hex digits plus one for
2114 zero termination). */
2116 dump_hash (unsigned char *buf, const unsigned char *hash)
2120 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2122 *buf++ = XDIGIT_TO_xchar (*hash >> 4);
2123 *buf++ = XDIGIT_TO_xchar (*hash & 0xf);
2128 /* Take the line apart to find the challenge, and compose a digest
2129 authorization header. See RFC2069 section 2.1.2. */
2131 digest_authentication_encode (const char *au, const char *user,
2132 const char *passwd, const char *method,
2135 static char *realm, *opaque, *nonce;
2140 { "realm", &realm },
2141 { "opaque", &opaque },
2146 realm = opaque = nonce = NULL;
2148 au += 6; /* skip over `Digest' */
2153 au += skip_lws (au);
2154 for (i = 0; i < ARRAY_SIZE (options); i++)
2156 int skip = extract_header_attr (au, options[i].name,
2157 options[i].variable);
2161 FREE_MAYBE (opaque);
2171 if (i == ARRAY_SIZE (options))
2173 while (*au && *au != '=')
2177 au += skip_lws (au);
2181 while (*au && *au != '\"')
2188 while (*au && *au != ',')
2193 if (!realm || !nonce || !user || !passwd || !path || !method)
2196 FREE_MAYBE (opaque);
2201 /* Calculate the digest value. */
2204 unsigned char hash[MD5_HASHLEN];
2205 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2206 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2208 /* A1BUF = H(user ":" realm ":" password) */
2209 md5_init_ctx (&ctx);
2210 md5_process_bytes (user, strlen (user), &ctx);
2211 md5_process_bytes (":", 1, &ctx);
2212 md5_process_bytes (realm, strlen (realm), &ctx);
2213 md5_process_bytes (":", 1, &ctx);
2214 md5_process_bytes (passwd, strlen (passwd), &ctx);
2215 md5_finish_ctx (&ctx, hash);
2216 dump_hash (a1buf, hash);
2218 /* A2BUF = H(method ":" path) */
2219 md5_init_ctx (&ctx);
2220 md5_process_bytes (method, strlen (method), &ctx);
2221 md5_process_bytes (":", 1, &ctx);
2222 md5_process_bytes (path, strlen (path), &ctx);
2223 md5_finish_ctx (&ctx, hash);
2224 dump_hash (a2buf, hash);
2226 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2227 md5_init_ctx (&ctx);
2228 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
2229 md5_process_bytes (":", 1, &ctx);
2230 md5_process_bytes (nonce, strlen (nonce), &ctx);
2231 md5_process_bytes (":", 1, &ctx);
2232 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
2233 md5_finish_ctx (&ctx, hash);
2234 dump_hash (response_digest, hash);
2236 res = (char*) xmalloc (strlen (user)
2241 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2242 + (opaque ? strlen (opaque) : 0)
2244 sprintf (res, "Authorization: Digest \
2245 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2246 user, realm, nonce, path, response_digest);
2249 char *p = res + strlen (res);
2250 strcat (p, ", opaque=\"");
2254 strcat (res, "\r\n");
2258 #endif /* USE_DIGEST */
2261 #define BEGINS_WITH(line, string_constant) \
2262 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2263 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2264 || !line[sizeof (string_constant) - 1]))
2267 known_authentication_scheme_p (const char *au)
2269 return BEGINS_WITH (au, "Basic")
2270 || BEGINS_WITH (au, "Digest")
2271 || BEGINS_WITH (au, "NTLM");
2276 /* Create the HTTP authorization request header. When the
2277 `WWW-Authenticate' response header is seen, according to the
2278 authorization scheme specified in that header (`Basic' and `Digest'
2279 are supported by the current implementation), produce an
2280 appropriate HTTP authorization request header. */
2282 create_authorization_line (const char *au, const char *user,
2283 const char *passwd, const char *method,
2286 char *wwwauth = NULL;
2288 if (!strncasecmp (au, "Basic", 5))
2289 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2290 if (!strncasecmp (au, "NTLM", 4))
2291 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2293 else if (!strncasecmp (au, "Digest", 6))
2294 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2295 #endif /* USE_DIGEST */