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 */
64 # 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 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
212 hdr += skip_lws (hdr);
218 for (num = 0; ISDIGIT (*hdr); hdr++)
219 num = 10 * num + (*hdr - '0');
220 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
222 closure->first_byte_pos = num;
224 for (num = 0; ISDIGIT (*hdr); hdr++)
225 num = 10 * num + (*hdr - '0');
226 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
228 closure->last_byte_pos = num;
230 for (num = 0; ISDIGIT (*hdr); hdr++)
231 num = 10 * num + (*hdr - '0');
232 closure->entity_length = num;
236 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
237 Used for `Accept-Ranges'. */
239 http_process_none (const char *hdr, void *arg)
241 int *where = (int *)arg;
243 if (strstr (hdr, "none"))
250 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
252 http_process_type (const char *hdr, void *arg)
254 char **result = (char **)arg;
255 /* Locate P on `;' or the terminating zero, whichever comes first. */
256 const char *p = strchr (hdr, ';');
258 p = hdr + strlen (hdr);
259 while (p > hdr && ISSPACE (*(p - 1)))
261 *result = strdupdelim (hdr, p);
265 /* Check whether the `Connection' header is set to "keep-alive". */
267 http_process_connection (const char *hdr, void *arg)
269 int *flag = (int *)arg;
270 if (!strcasecmp (hdr, "Keep-Alive"))
275 /* Persistent connections. Currently, we cache the most recently used
276 connection as persistent, provided that the HTTP server agrees to
277 make it such. The persistence data is stored in the variables
278 below. Ideally, it would be in a structure, and it should be
279 possible to cache an arbitrary fixed number of these connections.
281 I think the code is quite easy to extend in that direction. */
283 /* Whether a persistent connection is active. */
284 static int pc_active_p;
285 /* Host and port of currently active persistent connection. */
286 static struct address_list *pc_last_host_ip;
287 static unsigned short pc_last_port;
289 /* File descriptor of the currently active persistent connection. */
290 static int pc_last_fd;
293 /* Whether a ssl handshake has occoured on this connection */
294 static int pc_active_ssl;
295 /* SSL connection of the currently active persistent connection. */
296 static SSL *pc_last_ssl;
297 #endif /* HAVE_SSL */
299 /* Mark the persistent connection as invalid. This is used by the
300 CLOSE_* macros after they forcefully close a registered persistent
301 connection. This does not close the file descriptor -- it is left
302 to the caller to do that. (Maybe it should, though.) */
305 invalidate_persistent (void)
310 #endif /* HAVE_SSL */
311 if (pc_last_host_ip != NULL)
313 address_list_release (pc_last_host_ip);
314 pc_last_host_ip = NULL;
316 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
319 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
320 persistent. This will enable someone to use the same connection
321 later. In the context of HTTP, this must be called only AFTER the
322 response has been received and the server has promised that the
323 connection will remain alive.
325 If a previous connection was persistent, it is closed. */
328 register_persistent (const char *host, unsigned short port, int fd
336 if (pc_last_fd == fd)
338 /* The connection FD is already registered. Nothing to
344 /* The old persistent connection is still active; let's
345 close it first. This situation arises whenever a
346 persistent connection exists, but we then connect to a
347 different host, and try to register a persistent
348 connection to that one. */
350 /* The ssl disconnect has to take place before the closing
353 shutdown_ssl(pc_last_ssl);
356 invalidate_persistent ();
360 assert (pc_last_host_ip == NULL);
362 /* This lookup_host cannot fail, because it has the results in the
364 pc_last_host_ip = lookup_host (host, 1);
365 assert (pc_last_host_ip != NULL);
372 pc_active_ssl = ssl ? 1 : 0;
374 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
378 # define SHUTDOWN_SSL(ssl) do { \
380 shutdown_ssl (ssl); \
383 # define SHUTDOWN_SSL(ssl)
386 /* Return non-zero if a persistent connection is available for
387 connecting to HOST:PORT. */
390 persistent_available_p (const char *host, unsigned short port
397 struct address_list *this_host_ip;
399 /* First, check whether a persistent connection is active at all. */
402 /* Second, check if the active connection pertains to the correct
403 (HOST, PORT) ordered pair. */
404 if (port != pc_last_port)
408 /* Second, a): check if current connection is (not) ssl, too. This
409 test is unlikely to fail because HTTP and HTTPS typicaly use
410 different ports. Yet it is possible, or so I [Christian
411 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
413 if (ssl != pc_active_ssl)
415 #endif /* HAVE_SSL */
417 this_host_ip = lookup_host (host, 1);
421 /* To equate the two host names for the purposes of persistent
422 connections, they need to share all the IP addresses in the
424 success = address_list_match_all (pc_last_host_ip, this_host_ip);
425 address_list_release (this_host_ip);
429 /* Third: check whether the connection is still open. This is
430 important because most server implement a liberal (short) timeout
431 on persistent connections. Wget can of course always reconnect
432 if the connection doesn't work out, but it's nicer to know in
433 advance. This test is a logical followup of the first test, but
434 is "expensive" and therefore placed at the end of the list. */
435 if (!test_socket_open (pc_last_fd))
437 /* Oops, the socket is no longer open. Now that we know that,
438 let's invalidate the persistent connection before returning
442 SHUTDOWN_SSL (pc_last_ssl);
445 invalidate_persistent ();
451 /* The idea behind these two CLOSE macros is to distinguish between
452 two cases: one when the job we've been doing is finished, and we
453 want to close the connection and leave, and two when something is
454 seriously wrong and we're closing the connection as part of
457 In case of keep_alive, CLOSE_FINISH should leave the connection
458 open, while CLOSE_INVALIDATE should still close it.
460 Note that the semantics of the flag `keep_alive' is "this
461 connection *will* be reused (the server has promised not to close
462 the connection once we're done)", while the semantics of
463 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
464 active, registered connection". */
466 #define CLOSE_FINISH(fd) do { \
469 SHUTDOWN_SSL (ssl); \
471 if (pc_active_p && (fd) == pc_last_fd) \
472 invalidate_persistent (); \
476 #define CLOSE_INVALIDATE(fd) do { \
477 SHUTDOWN_SSL (ssl); \
479 if (pc_active_p && (fd) == pc_last_fd) \
480 invalidate_persistent (); \
485 long len; /* received length */
486 long contlen; /* expected length */
487 long restval; /* the restart value */
488 int res; /* the result of last read */
489 char *newloc; /* new location (redirection) */
490 char *remote_time; /* remote time-stamp string */
491 char *error; /* textual HTTP error */
492 int statcode; /* status code */
493 long dltime; /* time of the download */
494 int no_truncate; /* whether truncating the file is
496 const char *referer; /* value of the referer header. */
497 char **local_file; /* local file. */
501 free_hstat (struct http_stat *hs)
503 FREE_MAYBE (hs->newloc);
504 FREE_MAYBE (hs->remote_time);
505 FREE_MAYBE (hs->error);
507 /* Guard against being called twice. */
509 hs->remote_time = NULL;
513 static char *create_authorization_line PARAMS ((const char *, const char *,
514 const char *, const char *,
516 static char *basic_authentication_encode PARAMS ((const char *, const char *,
518 static int known_authentication_scheme_p PARAMS ((const char *));
520 time_t http_atotm PARAMS ((char *));
522 #define BEGINS_WITH(line, string_constant) \
523 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
524 && (ISSPACE (line[sizeof (string_constant) - 1]) \
525 || !line[sizeof (string_constant) - 1]))
527 /* Retrieve a document through HTTP protocol. It recognizes status
528 code, and correctly handles redirections. It closes the network
529 socket. If it receives an error from the functions below it, it
530 will print it if there is enough information to do so (almost
531 always), returning the error to the caller (i.e. http_loop).
533 Various HTTP parameters are stored to hs. Although it parses the
534 response code correctly, it is not used in a sane way. The caller
537 If PROXY is non-NULL, the connection will be made to the proxy
538 server, and u->url will be requested. */
540 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
542 char *request, *type, *command, *full_path;
544 char *pragma_h, *referer, *useragent, *range, *wwwauth;
545 char *authenticate_h;
549 char *request_keep_alive;
550 int sock, hcount, num_written, all_length, statcode;
551 long contlen, contrange;
554 int auth_tried_already;
557 static SSL_CTX *ssl_ctx = NULL;
559 #endif /* HAVE_SSL */
560 char *cookies = NULL;
562 /* Whether this connection will be kept alive after the HTTP request
566 /* Flags that detect the two ways of specifying HTTP keep-alive
568 int http_keep_alive_1, http_keep_alive_2;
570 /* Whether keep-alive should be inhibited. */
571 int inhibit_keep_alive;
574 /* initialize ssl_ctx on first run */
577 uerr_t err = init_ssl (&ssl_ctx);
582 case SSLERRCTXCREATE:
584 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
588 /* try without certfile */
589 logprintf (LOG_NOTQUIET,
590 _("Failed to load certificates from %s\n"),
593 logprintf (LOG_NOTQUIET,
594 _("Trying without the specified certificate\n"));
597 logprintf (LOG_NOTQUIET,
598 _("Failed to get certificate key from %s\n"),
601 logprintf (LOG_NOTQUIET,
602 _("Trying without the specified certificate\n"));
609 #endif /* HAVE_SSL */
611 if (!(*dt & HEAD_ONLY))
612 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
613 know the local filename so we can save to it. */
614 assert (*hs->local_file != NULL);
617 auth_tried_already = 0;
619 inhibit_keep_alive = !opt.http_keep_alive || proxy != NULL;
622 /* We need to come back here when the initial attempt to retrieve
623 without authorization header fails. (Expected to happen at least
624 for the Digest authorization scheme.) */
627 http_keep_alive_1 = http_keep_alive_2 = 0;
629 /* Initialize certain elements of struct http_stat. */
634 hs->remote_time = NULL;
637 /* If we're using a proxy, we will be connecting to the proxy
639 conn = proxy ? proxy : u;
641 /* First: establish the connection. */
642 if (inhibit_keep_alive
645 !persistent_available_p (conn->host, conn->port)
647 !persistent_available_p (conn->host, conn->port,
648 u->scheme == SCHEME_HTTPS)
649 #endif /* HAVE_SSL */
652 struct address_list *al = lookup_host (conn->host, 0);
655 set_connection_host_name (conn->host);
656 sock = connect_to_many (al, conn->port, 0);
657 set_connection_host_name (NULL);
658 address_list_release (al);
661 return errno == ECONNREFUSED ? CONREFUSED : CONERROR;
664 if (conn->scheme == SCHEME_HTTPS)
665 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
667 logputs (LOG_VERBOSE, "\n");
668 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
673 #endif /* HAVE_SSL */
677 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"),
678 conn->host, conn->port);
679 /* #### pc_last_fd should be accessed through an accessor
684 #endif /* HAVE_SSL */
685 DEBUGP (("Reusing fd %d.\n", sock));
688 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
693 referer = (char *)alloca (9 + strlen (hs->referer) + 3);
694 sprintf (referer, "Referer: %s\r\n", hs->referer);
697 if (*dt & SEND_NOCACHE)
698 pragma_h = "Pragma: no-cache\r\n";
704 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
705 /* Gag me! Some servers (e.g. WebSitePro) have been known to
706 respond to the following `Range' format by generating a
707 multipart/x-byte-ranges MIME document! This MIME type was
708 present in an old draft of the byteranges specification.
709 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
710 only if multiple non-overlapping ranges are requested --
711 which Wget never does. */
712 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
717 STRDUP_ALLOCA (useragent, opt.useragent);
720 useragent = (char *)alloca (10 + strlen (version_string));
721 sprintf (useragent, "Wget/%s", version_string);
723 /* Construct the authentication, if userid is present. */
726 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
727 user = user ? user : opt.http_user;
728 passwd = passwd ? passwd : opt.http_passwd;
735 /* We have the username and the password, but haven't tried
736 any authorization yet. Let's see if the "Basic" method
737 works. If not, we'll come back here and construct a
738 proper authorization method with the right challenges.
740 If we didn't employ this kind of logic, every URL that
741 requires authorization would have to be processed twice,
742 which is very suboptimal and generates a bunch of false
743 "unauthorized" errors in the server log.
745 #### But this logic also has a serious problem when used
746 with stronger authentications: we *first* transmit the
747 username and the password in clear text, and *then*
748 attempt a stronger authentication scheme. That cannot be
749 right! We are only fortunate that almost everyone still
750 uses the `Basic' scheme anyway.
752 There should be an option to prevent this from happening,
753 for those who use strong authentication schemes and value
755 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
759 wwwauth = create_authorization_line (authenticate_h, user, passwd,
767 char *proxy_user, *proxy_passwd;
768 /* For normal username and password, URL components override
769 command-line/wgetrc parameters. With proxy authentication,
770 it's the reverse, because proxy URLs are normally the
771 "permanent" ones, so command-line args should take
773 if (opt.proxy_user && opt.proxy_passwd)
775 proxy_user = opt.proxy_user;
776 proxy_passwd = opt.proxy_passwd;
780 proxy_user = proxy->user;
781 proxy_passwd = proxy->passwd;
783 /* #### This does not appear right. Can't the proxy request,
784 say, `Digest' authentication? */
785 if (proxy_user && proxy_passwd)
786 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
787 "Proxy-Authorization");
790 /* String of the form :PORT. Used only for non-standard ports. */
792 if (u->port != scheme_default_port (u->scheme))
794 port_maybe = (char *)alloca (numdigit (u->port) + 2);
795 sprintf (port_maybe, ":%d", u->port);
798 if (!inhibit_keep_alive)
799 request_keep_alive = "Connection: Keep-Alive\r\n";
801 request_keep_alive = NULL;
804 cookies = build_cookies_request (u->host, u->port, u->path,
806 u->scheme == SCHEME_HTTPS
813 full_path = xstrdup (u->url);
815 full_path = url_full_path (u);
817 /* Allocate the memory for the request. */
818 request = (char *)alloca (strlen (command)
822 + (port_maybe ? strlen (port_maybe) : 0)
823 + strlen (HTTP_ACCEPT)
824 + (request_keep_alive
825 ? strlen (request_keep_alive) : 0)
826 + (referer ? strlen (referer) : 0)
827 + (cookies ? strlen (cookies) : 0)
828 + (wwwauth ? strlen (wwwauth) : 0)
829 + (proxyauth ? strlen (proxyauth) : 0)
830 + (range ? strlen (range) : 0)
832 + (opt.user_header ? strlen (opt.user_header) : 0)
834 /* Construct the request. */
840 %s%s%s%s%s%s%s%s\r\n",
843 port_maybe ? port_maybe : "",
845 request_keep_alive ? request_keep_alive : "",
846 referer ? referer : "",
847 cookies ? cookies : "",
848 wwwauth ? wwwauth : "",
849 proxyauth ? proxyauth : "",
852 opt.user_header ? opt.user_header : "");
853 DEBUGP (("---request begin---\n%s---request end---\n", request));
855 /* Free the temporary memory. */
856 FREE_MAYBE (wwwauth);
857 FREE_MAYBE (proxyauth);
858 FREE_MAYBE (cookies);
861 /* Send the request to server. */
863 if (u->scheme == SCHEME_HTTPS)
864 num_written = ssl_iwrite (ssl, request, strlen (request));
866 #endif /* HAVE_SSL */
867 num_written = iwrite (sock, request, strlen (request));
871 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
873 CLOSE_INVALIDATE (sock);
876 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
877 proxy ? "Proxy" : "HTTP");
878 contlen = contrange = -1;
883 /* Before reading anything, initialize the rbuf. */
884 rbuf_initialize (&rbuf, sock);
886 if (u->scheme == SCHEME_HTTPS)
890 #endif /* HAVE_SSL */
893 /* Header-fetching loop. */
901 /* Get the header. */
902 status = header_get (&rbuf, &hdr,
903 /* Disallow continuations for status line. */
904 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
906 /* Check for errors. */
907 if (status == HG_EOF && *hdr)
909 /* This used to be an unconditional error, but that was
910 somewhat controversial, because of a large number of
911 broken CGI's that happily "forget" to send the second EOL
912 before closing the connection of a HEAD request.
914 So, the deal is to check whether the header is empty
915 (*hdr is zero if it is); if yes, it means that the
916 previous header was fully retrieved, and that -- most
917 probably -- the request is complete. "...be liberal in
918 what you accept." Oh boy. */
919 logputs (LOG_VERBOSE, "\n");
920 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
923 FREE_MAYBE (all_headers);
924 CLOSE_INVALIDATE (sock);
927 else if (status == HG_ERROR)
929 logputs (LOG_VERBOSE, "\n");
930 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
934 FREE_MAYBE (all_headers);
935 CLOSE_INVALIDATE (sock);
939 /* If the headers are to be saved to a file later, save them to
941 if (opt.save_headers)
943 int lh = strlen (hdr);
944 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
945 memcpy (all_headers + all_length, hdr, lh);
947 all_headers[all_length++] = '\n';
948 all_headers[all_length] = '\0';
951 /* Check for status line. */
955 /* Parse the first line of server response. */
956 statcode = parse_http_status_line (hdr, &error);
957 hs->statcode = statcode;
958 /* Store the descriptive response. */
959 if (statcode == -1) /* malformed response */
961 /* A common reason for "malformed response" error is the
962 case when no data was actually received. Handle this
965 hs->error = xstrdup (_("No data received"));
967 hs->error = xstrdup (_("Malformed status line"));
972 hs->error = xstrdup (_("(no description)"));
974 hs->error = xstrdup (error);
982 if (opt.server_response)
983 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
985 logprintf (LOG_VERBOSE, "%2d %s", statcode, error);
991 /* Exit on empty header. */
998 /* Print the header if requested. */
999 if (opt.server_response && hcount != 1)
1000 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
1002 /* Try getting content-length. */
1003 if (contlen == -1 && !opt.ignore_length)
1004 if (header_process (hdr, "Content-Length", header_extract_number,
1007 /* Try getting content-type. */
1009 if (header_process (hdr, "Content-Type", http_process_type, &type))
1011 /* Try getting location. */
1013 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1015 /* Try getting last-modified. */
1016 if (!hs->remote_time)
1017 if (header_process (hdr, "Last-Modified", header_strdup,
1020 /* Try getting cookies. */
1022 if (header_process (hdr, "Set-Cookie", set_cookie_header_cb, u))
1024 /* Try getting www-authentication. */
1025 if (!authenticate_h)
1026 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1029 /* Check for accept-ranges header. If it contains the word
1030 `none', disable the ranges. */
1031 if (*dt & ACCEPTRANGES)
1034 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1037 *dt &= ~ACCEPTRANGES;
1041 /* Try getting content-range. */
1042 if (contrange == -1)
1044 struct http_process_range_closure closure;
1045 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1047 contrange = closure.first_byte_pos;
1051 /* Check for keep-alive related responses. */
1052 if (!inhibit_keep_alive)
1054 /* Check for the `Keep-Alive' header. */
1055 if (!http_keep_alive_1)
1057 if (header_process (hdr, "Keep-Alive", header_exists,
1058 &http_keep_alive_1))
1061 /* Check for `Connection: Keep-Alive'. */
1062 if (!http_keep_alive_2)
1064 if (header_process (hdr, "Connection", http_process_connection,
1065 &http_keep_alive_2))
1073 logputs (LOG_VERBOSE, "\n");
1076 && (http_keep_alive_1 || http_keep_alive_2))
1078 assert (inhibit_keep_alive == 0);
1082 /* The server has promised that it will not close the connection
1083 when we're done. This means that we can register it. */
1085 register_persistent (conn->host, conn->port, sock);
1087 register_persistent (conn->host, conn->port, sock, ssl);
1088 #endif /* HAVE_SSL */
1090 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1093 /* Authorization is required. */
1097 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1098 might be more bytes in the body. */
1099 if (auth_tried_already)
1101 /* If we have tried it already, then there is not point
1104 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1105 xfree (authenticate_h);
1108 else if (!known_authentication_scheme_p (authenticate_h))
1110 xfree (authenticate_h);
1111 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1114 else if (BEGINS_WITH (authenticate_h, "Basic"))
1116 /* The authentication scheme is basic, the one we try by
1117 default, and it failed. There's no sense in trying
1123 auth_tried_already = 1;
1127 /* We do not need this anymore. */
1130 xfree (authenticate_h);
1131 authenticate_h = NULL;
1134 /* 20x responses are counted among successful by default. */
1135 if (H_20X (statcode))
1138 /* Return if redirected. */
1139 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1141 /* RFC2068 says that in case of the 300 (multiple choices)
1142 response, the server can output a preferred URL through
1143 `Location' header; otherwise, the request should be treated
1144 like GET. So, if the location is set, it will be a
1145 redirection; otherwise, just proceed normally. */
1146 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1150 logprintf (LOG_VERBOSE,
1151 _("Location: %s%s\n"),
1152 hs->newloc ? hs->newloc : _("unspecified"),
1153 hs->newloc ? _(" [following]") : "");
1154 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1155 might be more bytes in the body. */
1157 FREE_MAYBE (all_headers);
1162 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
1165 /* We don't assume text/html by default. */
1168 if (opt.html_extension && (*dt & TEXTHTML))
1169 /* -E / --html-extension / html_extension = on was specified, and this is a
1170 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1171 already the file's suffix, tack on ".html". */
1173 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1175 if (last_period_in_local_filename == NULL ||
1176 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
1177 strcasecmp(last_period_in_local_filename, ".html") == EQ))
1179 size_t local_filename_len = strlen(*hs->local_file);
1181 *hs->local_file = xrealloc(*hs->local_file,
1182 local_filename_len + sizeof(".html"));
1183 strcpy(*hs->local_file + local_filename_len, ".html");
1185 *dt |= ADDED_HTML_EXTENSION;
1189 if (contrange == -1)
1191 /* We did not get a content-range header. This means that the
1192 server did not honor our `Range' request. Normally, this
1193 means we should reset hs->restval and continue normally. */
1195 /* However, if `-c' is used, we need to be a bit more careful:
1197 1. If `-c' is specified and the file already existed when
1198 Wget was started, it would be a bad idea for us to start
1199 downloading it from scratch, effectively truncating it. I
1200 believe this cannot happen unless `-c' was specified.
1202 2. If `-c' is used on a file that is already fully
1203 downloaded, we're requesting bytes after the end of file,
1204 which can result in server not honoring `Range'. If this is
1205 the case, `Content-Length' will be equal to the length of the
1207 if (opt.always_rest)
1209 /* Check for condition #2. */
1210 if (hs->restval > 0 /* restart was requested. */
1211 && contlen != -1 /* we got content-length. */
1212 && hs->restval >= contlen /* file fully downloaded
1216 logputs (LOG_VERBOSE, _("\
1217 \n The file is already fully retrieved; nothing to do.\n\n"));
1218 /* In case the caller inspects. */
1222 FREE_MAYBE (all_headers);
1223 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1224 might be more bytes in the body. */
1225 return RETRUNNEEDED;
1228 /* Check for condition #1. */
1229 if (hs->no_truncate)
1231 logprintf (LOG_NOTQUIET,
1234 Continued download failed on this file, which conflicts with `-c'.\n\
1235 Refusing to truncate existing file `%s'.\n\n"), *hs->local_file);
1237 FREE_MAYBE (all_headers);
1238 CLOSE_INVALIDATE (sock);
1239 return CONTNOTSUPPORTED;
1247 else if (contrange != hs->restval ||
1248 (H_PARTIAL (statcode) && contrange == -1))
1250 /* This means the whole request was somehow misunderstood by the
1251 server. Bail out. */
1253 FREE_MAYBE (all_headers);
1254 CLOSE_INVALIDATE (sock);
1261 contlen += contrange;
1263 contrange = -1; /* If conent-length was not sent,
1264 content-range will be ignored. */
1266 hs->contlen = contlen;
1270 if ((*dt & RETROKF) && !opt.server_response)
1272 /* No need to print this output if the body won't be
1273 downloaded at all, or if the original server response is
1275 logputs (LOG_VERBOSE, _("Length: "));
1278 logputs (LOG_VERBOSE, legible (contlen));
1279 if (contrange != -1)
1280 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1281 legible (contlen - contrange));
1284 logputs (LOG_VERBOSE,
1285 opt.ignore_length ? _("ignored") : _("unspecified"));
1287 logprintf (LOG_VERBOSE, " [%s]\n", type);
1289 logputs (LOG_VERBOSE, "\n");
1293 type = NULL; /* We don't need it any more. */
1295 /* Return if we have no intention of further downloading. */
1296 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1298 /* In case the caller cares to look... */
1302 FREE_MAYBE (all_headers);
1303 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1304 might be more bytes in the body. */
1305 return RETRFINISHED;
1308 /* Open the local file. */
1311 mkalldirs (*hs->local_file);
1313 rotate_backups (*hs->local_file);
1314 fp = fopen (*hs->local_file, hs->restval ? "ab" : "wb");
1317 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1318 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1319 might be more bytes in the body. */
1320 FREE_MAYBE (all_headers);
1326 extern int global_download_count;
1328 /* To ensure that repeated "from scratch" downloads work for -O
1329 files, we rewind the file pointer, unless restval is
1330 non-zero. (This works only when -O is used on regular files,
1331 but it's still a valuable feature.)
1333 However, this loses when more than one URL is specified on
1334 the command line the second rewinds eradicates the contents
1335 of the first download. Thus we disable the above trick for
1336 all the downloads except the very first one.
1338 #### A possible solution to this would be to remember the
1339 file position in the output document and to seek to that
1340 position, instead of rewinding. */
1341 if (!hs->restval && global_download_count == 0)
1343 /* This will silently fail for streams that don't correspond
1344 to regular files, but that's OK. */
1346 /* ftruncate is needed because opt.dfp is opened in append
1347 mode if opt.always_rest is set. */
1348 ftruncate (fileno (fp), 0);
1353 /* #### This confuses the code that checks for file size. There
1354 should be some overhead information. */
1355 if (opt.save_headers)
1356 fwrite (all_headers, 1, all_length, fp);
1358 /* Get the contents of the document. */
1359 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1360 (contlen != -1 ? contlen : 0),
1361 &rbuf, keep_alive, &hs->dltime);
1364 /* Close or flush the file. We have to be careful to check for
1365 error here. Checking the result of fwrite() is not enough --
1366 errors could go unnoticed! */
1369 flush_res = fclose (fp);
1371 flush_res = fflush (fp);
1372 if (flush_res == EOF)
1375 FREE_MAYBE (all_headers);
1376 CLOSE_FINISH (sock);
1379 return RETRFINISHED;
1382 /* The genuine HTTP loop! This is the part where the retrieval is
1383 retried, and retried, and retried, and... */
1385 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1386 int *dt, struct url *proxy)
1389 int use_ts, got_head = 0; /* time-stamping info */
1390 char *filename_plus_orig_suffix;
1391 char *local_filename = NULL;
1392 char *tms, *suf, *locf, *tmrate;
1394 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1395 long local_size = 0; /* the size of the local file */
1396 size_t filename_len;
1397 struct http_stat hstat; /* HTTP status */
1401 /* This used to be done in main(), but it's a better idea to do it
1402 here so that we don't go through the hoops if we're just using
1404 if (opt.cookies && opt.cookies_input && !cookies_loaded_p)
1406 load_cookies (opt.cookies_input);
1407 cookies_loaded_p = 1;
1412 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1413 has_wildcards_p because it would also warn on `?', and we know that
1414 shows up in CGI paths a *lot*. */
1415 if (strchr (u->url, '*'))
1416 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1418 /* Determine the local filename. */
1419 if (local_file && *local_file)
1420 hstat.local_file = local_file;
1421 else if (local_file)
1423 *local_file = url_filename (u);
1424 hstat.local_file = local_file;
1428 dummy = url_filename (u);
1429 hstat.local_file = &dummy;
1432 if (!opt.output_document)
1433 locf = *hstat.local_file;
1435 locf = opt.output_document;
1437 hstat.referer = referer;
1439 filename_len = strlen (*hstat.local_file);
1440 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1442 if (opt.noclobber && file_exists_p (*hstat.local_file))
1444 /* If opt.noclobber is turned on and file already exists, do not
1445 retrieve the file */
1446 logprintf (LOG_VERBOSE, _("\
1447 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
1448 /* If the file is there, we suppose it's retrieved OK. */
1451 /* #### Bogusness alert. */
1452 /* If its suffix is "html" or "htm", assume text/html. */
1453 if (((suf = suffix (*hstat.local_file)) != NULL)
1454 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
1462 if (opt.timestamping)
1464 boolean local_dot_orig_file_exists = FALSE;
1466 if (opt.backup_converted)
1467 /* If -K is specified, we'll act on the assumption that it was specified
1468 last time these files were downloaded as well, and instead of just
1469 comparing local file X against server file X, we'll compare local
1470 file X.orig (if extant, else X) against server file X. If -K
1471 _wasn't_ specified last time, or the server contains files called
1472 *.orig, -N will be back to not operating correctly with -k. */
1474 /* Would a single s[n]printf() call be faster? --dan
1476 Definitely not. sprintf() is horribly slow. It's a
1477 different question whether the difference between the two
1478 affects a program. Usually I'd say "no", but at one
1479 point I profiled Wget, and found that a measurable and
1480 non-negligible amount of time was lost calling sprintf()
1481 in url.c. Replacing sprintf with inline calls to
1482 strcpy() and long_to_string() made a difference.
1484 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
1485 memcpy (filename_plus_orig_suffix + filename_len,
1486 ".orig", sizeof (".orig"));
1488 /* Try to stat() the .orig file. */
1489 if (stat (filename_plus_orig_suffix, &st) == 0)
1491 local_dot_orig_file_exists = TRUE;
1492 local_filename = filename_plus_orig_suffix;
1496 if (!local_dot_orig_file_exists)
1497 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1498 if (stat (*hstat.local_file, &st) == 0)
1499 local_filename = *hstat.local_file;
1501 if (local_filename != NULL)
1502 /* There was a local file, so we'll check later to see if the version
1503 the server has is the same version we already have, allowing us to
1508 local_size = st.st_size;
1512 /* Reset the counter. */
1514 *dt = 0 | ACCEPTRANGES;
1518 /* Increment the pass counter. */
1520 sleep_between_retrievals (count);
1521 /* Get the current time string. */
1522 tms = time_str (NULL);
1523 /* Print fetch message, if opt.verbose. */
1526 char *hurl = url_string (u, 1);
1530 sprintf (tmp, _("(try:%2d)"), count);
1531 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1532 tms, hurl, tmp, locf);
1534 ws_changetitle (hurl, 1);
1539 /* Default document type is empty. However, if spider mode is
1540 on or time-stamping is employed, HEAD_ONLY commands is
1541 encoded within *dt. */
1542 if (opt.spider || (use_ts && !got_head))
1546 /* Assume no restarting. */
1548 /* Decide whether or not to restart. */
1549 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1550 /* #### this calls access() and then stat(); could be optimized. */
1551 && file_exists_p (locf))
1552 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1553 hstat.restval = st.st_size;
1555 /* In `-c' is used and the file is existing and non-empty,
1556 refuse to truncate it if the server doesn't support continued
1558 hstat.no_truncate = 0;
1559 if (opt.always_rest && hstat.restval)
1560 hstat.no_truncate = 1;
1562 /* Decide whether to send the no-cache directive. We send it in
1564 a) we're using a proxy, and we're past our first retrieval.
1565 Some proxies are notorious for caching incomplete data, so
1566 we require a fresh get.
1567 b) caching is explicitly inhibited. */
1568 if ((proxy && count > 1) /* a */
1569 || !opt.allow_cache /* b */
1571 *dt |= SEND_NOCACHE;
1573 *dt &= ~SEND_NOCACHE;
1575 /* Try fetching the document, or at least its head. */
1576 err = gethttp (u, &hstat, dt, proxy);
1578 /* It's unfortunate that wget determines the local filename before finding
1579 out the Content-Type of the file. Barring a major restructuring of the
1580 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1581 *hstat.local_file to tack on ".html". */
1582 if (!opt.output_document)
1583 locf = *hstat.local_file;
1585 locf = opt.output_document;
1588 tms = time_str (NULL);
1589 /* Get the new location (with or without the redirection). */
1591 *newloc = xstrdup (hstat.newloc);
1594 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1595 case CONERROR: case READERR: case WRITEFAILED:
1597 /* Non-fatal errors continue executing the loop, which will
1598 bring them to "while" statement at the end, to judge
1599 whether the number of tries was exceeded. */
1600 free_hstat (&hstat);
1601 printwhat (count, opt.ntry);
1604 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1605 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1606 /* Fatal errors just return from the function. */
1607 free_hstat (&hstat);
1611 case FWRITEERR: case FOPENERR:
1612 /* Another fatal error. */
1613 logputs (LOG_VERBOSE, "\n");
1614 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1615 *hstat.local_file, strerror (errno));
1616 free_hstat (&hstat);
1621 /* Another fatal error. */
1622 logputs (LOG_VERBOSE, "\n");
1623 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1624 free_hstat (&hstat);
1629 /* Return the new location to the caller. */
1632 logprintf (LOG_NOTQUIET,
1633 _("ERROR: Redirection (%d) without location.\n"),
1635 free_hstat (&hstat);
1639 free_hstat (&hstat);
1644 /* The file was already fully retrieved. */
1645 free_hstat (&hstat);
1650 /* Deal with you later. */
1653 /* All possibilities should have been exhausted. */
1656 if (!(*dt & RETROKF))
1660 /* #### Ugly ugly ugly! */
1661 char *hurl = url_string (u, 1);
1662 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1665 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1666 tms, hstat.statcode, hstat.error);
1667 logputs (LOG_VERBOSE, "\n");
1668 free_hstat (&hstat);
1673 /* Did we get the time-stamp? */
1676 if (opt.timestamping && !hstat.remote_time)
1678 logputs (LOG_NOTQUIET, _("\
1679 Last-modified header missing -- time-stamps turned off.\n"));
1681 else if (hstat.remote_time)
1683 /* Convert the date-string into struct tm. */
1684 tmr = http_atotm (hstat.remote_time);
1685 if (tmr == (time_t) (-1))
1686 logputs (LOG_VERBOSE, _("\
1687 Last-modified header invalid -- time-stamp ignored.\n"));
1691 /* The time-stamping section. */
1696 use_ts = 0; /* no more time-stamping */
1697 count = 0; /* the retrieve count for HEAD is
1699 if (hstat.remote_time && tmr != (time_t) (-1))
1701 /* Now time-stamping can be used validly. Time-stamping
1702 means that if the sizes of the local and remote file
1703 match, and local file is newer than the remote file,
1704 it will not be retrieved. Otherwise, the normal
1705 download procedure is resumed. */
1707 (hstat.contlen == -1 || local_size == hstat.contlen))
1709 logprintf (LOG_VERBOSE, _("\
1710 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1712 free_hstat (&hstat);
1716 else if (tml >= tmr)
1717 logprintf (LOG_VERBOSE, _("\
1718 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1720 logputs (LOG_VERBOSE,
1721 _("Remote file is newer, retrieving.\n"));
1723 free_hstat (&hstat);
1726 if ((tmr != (time_t) (-1))
1728 && ((hstat.len == hstat.contlen) ||
1729 ((hstat.res == 0) &&
1730 ((hstat.contlen == -1) ||
1731 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1733 /* #### This code repeats in http.c and ftp.c. Move it to a
1735 const char *fl = NULL;
1736 if (opt.output_document)
1738 if (opt.od_known_regular)
1739 fl = opt.output_document;
1742 fl = *hstat.local_file;
1746 /* End of time-stamping section. */
1750 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1755 tmrate = retr_rate (hstat.len - hstat.restval, hstat.dltime, 0);
1757 if (hstat.len == hstat.contlen)
1761 logprintf (LOG_VERBOSE,
1762 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1763 tms, tmrate, locf, hstat.len, hstat.contlen);
1764 logprintf (LOG_NONVERBOSE,
1765 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1766 tms, u->url, hstat.len, hstat.contlen, locf, count);
1769 downloaded_increase (hstat.len);
1771 /* Remember that we downloaded the file for later ".orig" code. */
1772 if (*dt & ADDED_HTML_EXTENSION)
1773 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1775 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1777 free_hstat (&hstat);
1781 else if (hstat.res == 0) /* No read error */
1783 if (hstat.contlen == -1) /* We don't know how much we were supposed
1784 to get, so assume we succeeded. */
1788 logprintf (LOG_VERBOSE,
1789 _("%s (%s) - `%s' saved [%ld]\n\n"),
1790 tms, tmrate, locf, hstat.len);
1791 logprintf (LOG_NONVERBOSE,
1792 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1793 tms, u->url, hstat.len, locf, count);
1796 downloaded_increase (hstat.len);
1798 /* Remember that we downloaded the file for later ".orig" code. */
1799 if (*dt & ADDED_HTML_EXTENSION)
1800 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1802 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1804 free_hstat (&hstat);
1808 else if (hstat.len < hstat.contlen) /* meaning we lost the
1809 connection too soon */
1811 logprintf (LOG_VERBOSE,
1812 _("%s (%s) - Connection closed at byte %ld. "),
1813 tms, tmrate, hstat.len);
1814 printwhat (count, opt.ntry);
1815 free_hstat (&hstat);
1818 else if (!opt.kill_longer) /* meaning we got more than expected */
1820 logprintf (LOG_VERBOSE,
1821 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1822 tms, tmrate, locf, hstat.len, hstat.contlen);
1823 logprintf (LOG_NONVERBOSE,
1824 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1825 tms, u->url, hstat.len, hstat.contlen, locf, count);
1827 downloaded_increase (hstat.len);
1829 /* Remember that we downloaded the file for later ".orig" code. */
1830 if (*dt & ADDED_HTML_EXTENSION)
1831 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1833 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1835 free_hstat (&hstat);
1839 else /* the same, but not accepted */
1841 logprintf (LOG_VERBOSE,
1842 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1843 tms, tmrate, hstat.len, hstat.contlen);
1844 printwhat (count, opt.ntry);
1845 free_hstat (&hstat);
1849 else /* now hstat.res can only be -1 */
1851 if (hstat.contlen == -1)
1853 logprintf (LOG_VERBOSE,
1854 _("%s (%s) - Read error at byte %ld (%s)."),
1855 tms, tmrate, hstat.len, strerror (errno));
1856 printwhat (count, opt.ntry);
1857 free_hstat (&hstat);
1860 else /* hstat.res == -1 and contlen is given */
1862 logprintf (LOG_VERBOSE,
1863 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1864 tms, tmrate, hstat.len, hstat.contlen,
1866 printwhat (count, opt.ntry);
1867 free_hstat (&hstat);
1874 while (!opt.ntry || (count < opt.ntry));
1878 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1879 than local timezone.
1881 mktime is similar but assumes struct tm, also known as the
1882 "broken-down" form of time, is in local time zone. mktime_from_utc
1883 uses mktime to make the conversion understanding that an offset
1884 will be introduced by the local time assumption.
1886 mktime_from_utc then measures the introduced offset by applying
1887 gmtime to the initial result and applying mktime to the resulting
1888 "broken-down" form. The difference between the two mktime results
1889 is the measured offset which is then subtracted from the initial
1890 mktime result to yield a calendar time which is the value returned.
1892 tm_isdst in struct tm is set to 0 to force mktime to introduce a
1893 consistent offset (the non DST offset) since tm and tm+o might be
1894 on opposite sides of a DST change.
1896 Some implementations of mktime return -1 for the nonexistent
1897 localtime hour at the beginning of DST. In this event, use
1898 mktime(tm - 1hr) + 3600.
1902 gmtime(t+o) --> tm+o
1903 mktime(tm+o) --> t+2o
1904 t+o - (t+2o - t+o) = t
1906 Note that glibc contains a function of the same purpose named
1907 `timegm' (reverse of gmtime). But obviously, it is not universally
1908 available, and unfortunately it is not straightforwardly
1909 extractable for use here. Perhaps configure should detect timegm
1910 and use it where available.
1912 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1913 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
1914 Further improved by Roger with assistance from Edward J. Sabol
1915 based on input by Jamie Zawinski. */
1918 mktime_from_utc (struct tm *t)
1929 return -1; /* can't deal with output from strptime */
1940 return -1; /* can't deal with output from gmtime */
1943 return (tl - (tb - tl));
1946 /* Check whether the result of strptime() indicates success.
1947 strptime() returns the pointer to how far it got to in the string.
1948 The processing has been successful if the string is at `GMT' or
1949 `+X', or at the end of the string.
1951 In extended regexp parlance, the function returns 1 if P matches
1952 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
1953 can return) is considered a failure and 0 is returned. */
1955 check_end (const char *p)
1959 while (ISSPACE (*p))
1962 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1963 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
1969 /* Convert the textual specification of time in TIME_STRING to the
1970 number of seconds since the Epoch.
1972 TIME_STRING can be in any of the three formats RFC2068 allows the
1973 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
1974 Timezones are ignored, and should be GMT.
1976 Return the computed time_t representation, or -1 if the conversion
1979 This function uses strptime with various string formats for parsing
1980 TIME_STRING. This results in a parser that is not as lenient in
1981 interpreting TIME_STRING as I would like it to be. Being based on
1982 strptime, it always allows shortened months, one-digit days, etc.,
1983 but due to the multitude of formats in which time can be
1984 represented, an ideal HTTP time parser would be even more
1985 forgiving. It should completely ignore things like week days and
1986 concentrate only on the various forms of representing years,
1987 months, days, hours, minutes, and seconds. For example, it would
1988 be nice if it accepted ISO 8601 out of the box.
1990 I've investigated free and PD code for this purpose, but none was
1991 usable. getdate was big and unwieldy, and had potential copyright
1992 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
1993 distributed with phttpd, is excellent, but we cannot use it because
1994 it is not assigned to the FSF. So I stuck it with strptime. */
1997 http_atotm (char *time_string)
1999 /* NOTE: Solaris strptime man page claims that %n and %t match white
2000 space, but that's not universally available. Instead, we simply
2001 use ` ' to mean "skip all WS", which works under all strptime
2002 implementations I've tested. */
2004 static const char *time_formats[] = {
2005 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
2006 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
2007 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
2008 (google.com uses this for their cookies.) */
2009 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2015 /* According to Roger Beeman, we need to initialize tm_isdst, since
2016 strptime won't do it. */
2019 /* Note that under foreign locales Solaris strptime() fails to
2020 recognize English dates, which renders this function useless. We
2021 solve this by being careful not to affect LC_TIME when
2022 initializing locale.
2024 Another solution would be to temporarily set locale to C, invoke
2025 strptime(), and restore it back. This is slow and dirty,
2026 however, and locale support other than LC_MESSAGES can mess other
2027 things, so I rather chose to stick with just setting LC_MESSAGES.
2029 GNU strptime does not have this problem because it recognizes
2030 both international and local dates. */
2032 for (i = 0; i < ARRAY_SIZE (time_formats); i++)
2033 if (check_end (strptime (time_string, time_formats[i], &t)))
2034 return mktime_from_utc (&t);
2036 /* All formats have failed. */
2040 /* Authorization support: We support two authorization schemes:
2042 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2044 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2045 consisting of answering to the server's challenge with the proper
2048 /* How many bytes it will take to store LEN bytes in base64. */
2049 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2051 /* Encode the string S of length LENGTH to base64 format and place it
2052 to STORE. STORE will be 0-terminated, and must point to a writable
2053 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2055 base64_encode (const char *s, char *store, int length)
2057 /* Conversion table. */
2058 static char tbl[64] = {
2059 'A','B','C','D','E','F','G','H',
2060 'I','J','K','L','M','N','O','P',
2061 'Q','R','S','T','U','V','W','X',
2062 'Y','Z','a','b','c','d','e','f',
2063 'g','h','i','j','k','l','m','n',
2064 'o','p','q','r','s','t','u','v',
2065 'w','x','y','z','0','1','2','3',
2066 '4','5','6','7','8','9','+','/'
2069 unsigned char *p = (unsigned char *)store;
2071 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2072 for (i = 0; i < length; i += 3)
2074 *p++ = tbl[s[0] >> 2];
2075 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2076 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2077 *p++ = tbl[s[2] & 0x3f];
2080 /* Pad the result if necessary... */
2081 if (i == length + 1)
2083 else if (i == length + 2)
2084 *(p - 1) = *(p - 2) = '=';
2085 /* ...and zero-terminate it. */
2089 /* Create the authentication header contents for the `Basic' scheme.
2090 This is done by encoding the string `USER:PASS' in base64 and
2091 prepending `HEADER: Basic ' to it. */
2093 basic_authentication_encode (const char *user, const char *passwd,
2096 char *t1, *t2, *res;
2097 int len1 = strlen (user) + 1 + strlen (passwd);
2098 int len2 = BASE64_LENGTH (len1);
2100 t1 = (char *)alloca (len1 + 1);
2101 sprintf (t1, "%s:%s", user, passwd);
2102 t2 = (char *)alloca (1 + len2);
2103 base64_encode (t1, t2, len1);
2104 res = (char *)xmalloc (len2 + 11 + strlen (header));
2105 sprintf (res, "%s: Basic %s\r\n", header, t2);
2111 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2112 of a field in such a header. If the field is the one specified by
2113 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2114 digest authorization code), extract its value in the (char*)
2115 variable pointed by RET. Returns negative on a malformed header,
2116 or number of bytes that have been parsed by this call. */
2118 extract_header_attr (const char *au, const char *attr_name, char **ret)
2120 const char *cp, *ep;
2124 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2126 cp += strlen (attr_name);
2129 cp += skip_lws (cp);
2134 cp += skip_lws (cp);
2139 for (ep = cp; *ep && *ep != '\"'; ep++)
2144 *ret = strdupdelim (cp, ep);
2151 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2152 an array of 16 bytes containing the hash keys, and BUF should be a
2153 buffer of 33 writable characters (32 for hex digits plus one for
2154 zero termination). */
2156 dump_hash (unsigned char *buf, const unsigned char *hash)
2160 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2162 *buf++ = XDIGIT_TO_xchar (*hash >> 4);
2163 *buf++ = XDIGIT_TO_xchar (*hash & 0xf);
2168 /* Take the line apart to find the challenge, and compose a digest
2169 authorization header. See RFC2069 section 2.1.2. */
2171 digest_authentication_encode (const char *au, const char *user,
2172 const char *passwd, const char *method,
2175 static char *realm, *opaque, *nonce;
2180 { "realm", &realm },
2181 { "opaque", &opaque },
2186 realm = opaque = nonce = NULL;
2188 au += 6; /* skip over `Digest' */
2193 au += skip_lws (au);
2194 for (i = 0; i < ARRAY_SIZE (options); i++)
2196 int skip = extract_header_attr (au, options[i].name,
2197 options[i].variable);
2201 FREE_MAYBE (opaque);
2211 if (i == ARRAY_SIZE (options))
2213 while (*au && *au != '=')
2217 au += skip_lws (au);
2221 while (*au && *au != '\"')
2228 while (*au && *au != ',')
2233 if (!realm || !nonce || !user || !passwd || !path || !method)
2236 FREE_MAYBE (opaque);
2241 /* Calculate the digest value. */
2243 ALLOCA_MD5_CONTEXT (ctx);
2244 unsigned char hash[MD5_HASHLEN];
2245 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2246 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2248 /* A1BUF = H(user ":" realm ":" password) */
2250 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2251 gen_md5_update ((unsigned char *)":", 1, ctx);
2252 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2253 gen_md5_update ((unsigned char *)":", 1, ctx);
2254 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2255 gen_md5_finish (ctx, hash);
2256 dump_hash (a1buf, hash);
2258 /* A2BUF = H(method ":" path) */
2260 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2261 gen_md5_update ((unsigned char *)":", 1, ctx);
2262 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2263 gen_md5_finish (ctx, hash);
2264 dump_hash (a2buf, hash);
2266 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2268 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2269 gen_md5_update ((unsigned char *)":", 1, ctx);
2270 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2271 gen_md5_update ((unsigned char *)":", 1, ctx);
2272 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2273 gen_md5_finish (ctx, hash);
2274 dump_hash (response_digest, hash);
2276 res = (char*) xmalloc (strlen (user)
2281 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2282 + (opaque ? strlen (opaque) : 0)
2284 sprintf (res, "Authorization: Digest \
2285 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2286 user, realm, nonce, path, response_digest);
2289 char *p = res + strlen (res);
2290 strcat (p, ", opaque=\"");
2294 strcat (res, "\r\n");
2298 #endif /* USE_DIGEST */
2301 #define BEGINS_WITH(line, string_constant) \
2302 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2303 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2304 || !line[sizeof (string_constant) - 1]))
2307 known_authentication_scheme_p (const char *au)
2309 return BEGINS_WITH (au, "Basic")
2310 || BEGINS_WITH (au, "Digest")
2311 || BEGINS_WITH (au, "NTLM");
2316 /* Create the HTTP authorization request header. When the
2317 `WWW-Authenticate' response header is seen, according to the
2318 authorization scheme specified in that header (`Basic' and `Digest'
2319 are supported by the current implementation), produce an
2320 appropriate HTTP authorization request header. */
2322 create_authorization_line (const char *au, const char *user,
2323 const char *passwd, const char *method,
2326 char *wwwauth = NULL;
2328 if (!strncasecmp (au, "Basic", 5))
2329 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2330 if (!strncasecmp (au, "NTLM", 4))
2331 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2333 else if (!strncasecmp (au, "Digest", 6))
2334 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2335 #endif /* USE_DIGEST */
2342 if (pc_last_host_ip)
2343 address_list_release (pc_last_host_ip);