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));
377 /* Return non-zero if a persistent connection is available for
378 connecting to HOST:PORT. */
381 persistent_available_p (const char *host, unsigned short port
388 struct address_list *this_host_ip;
390 /* First, check whether a persistent connection is active at all. */
393 /* Second, check if the active connection pertains to the correct
394 (HOST, PORT) ordered pair. */
395 if (port != pc_last_port)
399 /* Second, a): check if current connection is (not) ssl, too. This
400 test is unlikely to fail because HTTP and HTTPS typicaly use
401 different ports. Yet it is possible, or so I [Christian
402 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
404 if (ssl != pc_active_ssl)
406 #endif /* HAVE_SSL */
408 this_host_ip = lookup_host (host, 1);
412 /* To equate the two host names for the purposes of persistent
413 connections, they need to share all the IP addresses in the
415 success = address_list_match_all (pc_last_host_ip, this_host_ip);
416 address_list_release (this_host_ip);
420 /* Third: check whether the connection is still open. This is
421 important because most server implement a liberal (short) timeout
422 on persistent connections. Wget can of course always reconnect
423 if the connection doesn't work out, but it's nicer to know in
424 advance. This test is a logical followup of the first test, but
425 is "expensive" and therefore placed at the end of the list. */
426 if (!test_socket_open (pc_last_fd))
428 /* Oops, the socket is no longer open. Now that we know that,
429 let's invalidate the persistent connection before returning
432 invalidate_persistent ();
439 # define SHUTDOWN_SSL(ssl) do { \
441 shutdown_ssl (ssl); \
444 # define SHUTDOWN_SSL(ssl)
447 /* The idea behind these two CLOSE macros is to distinguish between
448 two cases: one when the job we've been doing is finished, and we
449 want to close the connection and leave, and two when something is
450 seriously wrong and we're closing the connection as part of
453 In case of keep_alive, CLOSE_FINISH should leave the connection
454 open, while CLOSE_INVALIDATE should still close it.
456 Note that the semantics of the flag `keep_alive' is "this
457 connection *will* be reused (the server has promised not to close
458 the connection once we're done)", while the semantics of
459 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
460 active, registered connection". */
462 #define CLOSE_FINISH(fd) do { \
465 SHUTDOWN_SSL (ssl); \
467 if (pc_active_p && (fd) == pc_last_fd) \
468 invalidate_persistent (); \
472 #define CLOSE_INVALIDATE(fd) do { \
473 SHUTDOWN_SSL (ssl); \
475 if (pc_active_p && (fd) == pc_last_fd) \
476 invalidate_persistent (); \
481 long len; /* received length */
482 long contlen; /* expected length */
483 long restval; /* the restart value */
484 int res; /* the result of last read */
485 char *newloc; /* new location (redirection) */
486 char *remote_time; /* remote time-stamp string */
487 char *error; /* textual HTTP error */
488 int statcode; /* status code */
489 long dltime; /* time of the download */
490 int no_truncate; /* whether truncating the file is
492 const char *referer; /* value of the referer header. */
493 char **local_file; /* local file. */
497 free_hstat (struct http_stat *hs)
499 FREE_MAYBE (hs->newloc);
500 FREE_MAYBE (hs->remote_time);
501 FREE_MAYBE (hs->error);
503 /* Guard against being called twice. */
505 hs->remote_time = NULL;
509 static char *create_authorization_line PARAMS ((const char *, const char *,
510 const char *, const char *,
512 static char *basic_authentication_encode PARAMS ((const char *, const char *,
514 static int known_authentication_scheme_p PARAMS ((const char *));
516 time_t http_atotm PARAMS ((char *));
518 #define BEGINS_WITH(line, string_constant) \
519 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
520 && (ISSPACE (line[sizeof (string_constant) - 1]) \
521 || !line[sizeof (string_constant) - 1]))
523 /* Retrieve a document through HTTP protocol. It recognizes status
524 code, and correctly handles redirections. It closes the network
525 socket. If it receives an error from the functions below it, it
526 will print it if there is enough information to do so (almost
527 always), returning the error to the caller (i.e. http_loop).
529 Various HTTP parameters are stored to hs. Although it parses the
530 response code correctly, it is not used in a sane way. The caller
533 If PROXY is non-NULL, the connection will be made to the proxy
534 server, and u->url will be requested. */
536 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
538 char *request, *type, *command, *full_path;
540 char *pragma_h, *referer, *useragent, *range, *wwwauth;
541 char *authenticate_h;
545 char *request_keep_alive;
546 int sock, hcount, num_written, all_length, statcode;
547 long contlen, contrange;
550 int auth_tried_already;
553 static SSL_CTX *ssl_ctx = NULL;
555 #endif /* HAVE_SSL */
556 char *cookies = NULL;
558 /* Whether this connection will be kept alive after the HTTP request
562 /* Flags that detect the two ways of specifying HTTP keep-alive
564 int http_keep_alive_1, http_keep_alive_2;
566 /* Whether keep-alive should be inhibited. */
567 int inhibit_keep_alive;
570 /* initialize ssl_ctx on first run */
573 uerr_t err = init_ssl (&ssl_ctx);
578 case SSLERRCTXCREATE:
580 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
584 /* try without certfile */
585 logprintf (LOG_NOTQUIET,
586 _("Failed to load certificates from %s\n"),
589 logprintf (LOG_NOTQUIET,
590 _("Trying without the specified certificate\n"));
593 logprintf (LOG_NOTQUIET,
594 _("Failed to get certificate key from %s\n"),
597 logprintf (LOG_NOTQUIET,
598 _("Trying without the specified certificate\n"));
605 #endif /* HAVE_SSL */
607 if (!(*dt & HEAD_ONLY))
608 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
609 know the local filename so we can save to it. */
610 assert (*hs->local_file != NULL);
613 auth_tried_already = 0;
615 inhibit_keep_alive = !opt.http_keep_alive || proxy != NULL;
618 /* We need to come back here when the initial attempt to retrieve
619 without authorization header fails. (Expected to happen at least
620 for the Digest authorization scheme.) */
623 http_keep_alive_1 = http_keep_alive_2 = 0;
625 /* Initialize certain elements of struct http_stat. */
630 hs->remote_time = NULL;
633 /* If we're using a proxy, we will be connecting to the proxy
635 conn = proxy ? proxy : u;
637 /* First: establish the connection. */
638 if (inhibit_keep_alive
641 !persistent_available_p (conn->host, conn->port)
643 !persistent_available_p (conn->host, conn->port,
644 u->scheme == SCHEME_HTTPS)
645 #endif /* HAVE_SSL */
648 struct address_list *al = lookup_host (conn->host, 0);
651 set_connection_host_name (conn->host);
652 sock = connect_to_many (al, conn->port, 0);
653 set_connection_host_name (NULL);
654 address_list_release (al);
657 return errno == ECONNREFUSED ? CONREFUSED : CONERROR;
660 if (conn->scheme == SCHEME_HTTPS)
661 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
663 logputs (LOG_VERBOSE, "\n");
664 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
669 #endif /* HAVE_SSL */
673 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"),
674 conn->host, conn->port);
675 /* #### pc_last_fd should be accessed through an accessor
680 #endif /* HAVE_SSL */
681 DEBUGP (("Reusing fd %d.\n", sock));
684 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
689 referer = (char *)alloca (9 + strlen (hs->referer) + 3);
690 sprintf (referer, "Referer: %s\r\n", hs->referer);
693 if (*dt & SEND_NOCACHE)
694 pragma_h = "Pragma: no-cache\r\n";
700 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
701 /* Gag me! Some servers (e.g. WebSitePro) have been known to
702 respond to the following `Range' format by generating a
703 multipart/x-byte-ranges MIME document! This MIME type was
704 present in an old draft of the byteranges specification.
705 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
706 only if multiple non-overlapping ranges are requested --
707 which Wget never does. */
708 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
713 STRDUP_ALLOCA (useragent, opt.useragent);
716 useragent = (char *)alloca (10 + strlen (version_string));
717 sprintf (useragent, "Wget/%s", version_string);
719 /* Construct the authentication, if userid is present. */
722 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
723 user = user ? user : opt.http_user;
724 passwd = passwd ? passwd : opt.http_passwd;
731 /* We have the username and the password, but haven't tried
732 any authorization yet. Let's see if the "Basic" method
733 works. If not, we'll come back here and construct a
734 proper authorization method with the right challenges.
736 If we didn't employ this kind of logic, every URL that
737 requires authorization would have to be processed twice,
738 which is very suboptimal and generates a bunch of false
739 "unauthorized" errors in the server log.
741 #### But this logic also has a serious problem when used
742 with stronger authentications: we *first* transmit the
743 username and the password in clear text, and *then*
744 attempt a stronger authentication scheme. That cannot be
745 right! We are only fortunate that almost everyone still
746 uses the `Basic' scheme anyway.
748 There should be an option to prevent this from happening,
749 for those who use strong authentication schemes and value
751 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
755 wwwauth = create_authorization_line (authenticate_h, user, passwd,
763 char *proxy_user, *proxy_passwd;
764 /* For normal username and password, URL components override
765 command-line/wgetrc parameters. With proxy authentication,
766 it's the reverse, because proxy URLs are normally the
767 "permanent" ones, so command-line args should take
769 if (opt.proxy_user && opt.proxy_passwd)
771 proxy_user = opt.proxy_user;
772 proxy_passwd = opt.proxy_passwd;
776 proxy_user = proxy->user;
777 proxy_passwd = proxy->passwd;
779 /* #### This does not appear right. Can't the proxy request,
780 say, `Digest' authentication? */
781 if (proxy_user && proxy_passwd)
782 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
783 "Proxy-Authorization");
786 /* String of the form :PORT. Used only for non-standard ports. */
788 if (u->port != scheme_default_port (u->scheme))
790 port_maybe = (char *)alloca (numdigit (u->port) + 2);
791 sprintf (port_maybe, ":%d", u->port);
794 if (!inhibit_keep_alive)
795 request_keep_alive = "Connection: Keep-Alive\r\n";
797 request_keep_alive = NULL;
800 cookies = build_cookies_request (u->host, u->port, u->path,
802 u->scheme == SCHEME_HTTPS
809 full_path = xstrdup (u->url);
811 full_path = url_full_path (u);
813 /* Allocate the memory for the request. */
814 request = (char *)alloca (strlen (command)
818 + (port_maybe ? strlen (port_maybe) : 0)
819 + strlen (HTTP_ACCEPT)
820 + (request_keep_alive
821 ? strlen (request_keep_alive) : 0)
822 + (referer ? strlen (referer) : 0)
823 + (cookies ? strlen (cookies) : 0)
824 + (wwwauth ? strlen (wwwauth) : 0)
825 + (proxyauth ? strlen (proxyauth) : 0)
826 + (range ? strlen (range) : 0)
828 + (opt.user_header ? strlen (opt.user_header) : 0)
830 /* Construct the request. */
836 %s%s%s%s%s%s%s%s\r\n",
839 port_maybe ? port_maybe : "",
841 request_keep_alive ? request_keep_alive : "",
842 referer ? referer : "",
843 cookies ? cookies : "",
844 wwwauth ? wwwauth : "",
845 proxyauth ? proxyauth : "",
848 opt.user_header ? opt.user_header : "");
849 DEBUGP (("---request begin---\n%s---request end---\n", request));
851 /* Free the temporary memory. */
852 FREE_MAYBE (wwwauth);
853 FREE_MAYBE (proxyauth);
854 FREE_MAYBE (cookies);
857 /* Send the request to server. */
859 if (u->scheme == SCHEME_HTTPS)
860 num_written = ssl_iwrite (ssl, request, strlen (request));
862 #endif /* HAVE_SSL */
863 num_written = iwrite (sock, request, strlen (request));
867 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
869 CLOSE_INVALIDATE (sock);
872 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
873 proxy ? "Proxy" : "HTTP");
874 contlen = contrange = -1;
879 /* Before reading anything, initialize the rbuf. */
880 rbuf_initialize (&rbuf, sock);
882 if (u->scheme == SCHEME_HTTPS)
886 #endif /* HAVE_SSL */
889 /* Header-fetching loop. */
897 /* Get the header. */
898 status = header_get (&rbuf, &hdr,
899 /* Disallow continuations for status line. */
900 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
902 /* Check for errors. */
903 if (status == HG_EOF && *hdr)
905 /* This used to be an unconditional error, but that was
906 somewhat controversial, because of a large number of
907 broken CGI's that happily "forget" to send the second EOL
908 before closing the connection of a HEAD request.
910 So, the deal is to check whether the header is empty
911 (*hdr is zero if it is); if yes, it means that the
912 previous header was fully retrieved, and that -- most
913 probably -- the request is complete. "...be liberal in
914 what you accept." Oh boy. */
915 logputs (LOG_VERBOSE, "\n");
916 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
919 FREE_MAYBE (all_headers);
920 CLOSE_INVALIDATE (sock);
923 else if (status == HG_ERROR)
925 logputs (LOG_VERBOSE, "\n");
926 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
930 FREE_MAYBE (all_headers);
931 CLOSE_INVALIDATE (sock);
935 /* If the headers are to be saved to a file later, save them to
937 if (opt.save_headers)
939 int lh = strlen (hdr);
940 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
941 memcpy (all_headers + all_length, hdr, lh);
943 all_headers[all_length++] = '\n';
944 all_headers[all_length] = '\0';
947 /* Check for status line. */
951 /* Parse the first line of server response. */
952 statcode = parse_http_status_line (hdr, &error);
953 hs->statcode = statcode;
954 /* Store the descriptive response. */
955 if (statcode == -1) /* malformed response */
957 /* A common reason for "malformed response" error is the
958 case when no data was actually received. Handle this
961 hs->error = xstrdup (_("No data received"));
963 hs->error = xstrdup (_("Malformed status line"));
968 hs->error = xstrdup (_("(no description)"));
970 hs->error = xstrdup (error);
978 if (opt.server_response)
979 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
981 logprintf (LOG_VERBOSE, "%2d %s", statcode, error);
987 /* Exit on empty header. */
994 /* Print the header if requested. */
995 if (opt.server_response && hcount != 1)
996 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
998 /* Try getting content-length. */
999 if (contlen == -1 && !opt.ignore_length)
1000 if (header_process (hdr, "Content-Length", header_extract_number,
1003 /* Try getting content-type. */
1005 if (header_process (hdr, "Content-Type", http_process_type, &type))
1007 /* Try getting location. */
1009 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1011 /* Try getting last-modified. */
1012 if (!hs->remote_time)
1013 if (header_process (hdr, "Last-Modified", header_strdup,
1016 /* Try getting cookies. */
1018 if (header_process (hdr, "Set-Cookie", set_cookie_header_cb, u))
1020 /* Try getting www-authentication. */
1021 if (!authenticate_h)
1022 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1025 /* Check for accept-ranges header. If it contains the word
1026 `none', disable the ranges. */
1027 if (*dt & ACCEPTRANGES)
1030 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1033 *dt &= ~ACCEPTRANGES;
1037 /* Try getting content-range. */
1038 if (contrange == -1)
1040 struct http_process_range_closure closure;
1041 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1043 contrange = closure.first_byte_pos;
1047 /* Check for keep-alive related responses. */
1048 if (!inhibit_keep_alive)
1050 /* Check for the `Keep-Alive' header. */
1051 if (!http_keep_alive_1)
1053 if (header_process (hdr, "Keep-Alive", header_exists,
1054 &http_keep_alive_1))
1057 /* Check for `Connection: Keep-Alive'. */
1058 if (!http_keep_alive_2)
1060 if (header_process (hdr, "Connection", http_process_connection,
1061 &http_keep_alive_2))
1069 logputs (LOG_VERBOSE, "\n");
1072 && (http_keep_alive_1 || http_keep_alive_2))
1074 assert (inhibit_keep_alive == 0);
1078 /* The server has promised that it will not close the connection
1079 when we're done. This means that we can register it. */
1081 register_persistent (conn->host, conn->port, sock);
1083 register_persistent (conn->host, conn->port, sock, ssl);
1084 #endif /* HAVE_SSL */
1086 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1089 /* Authorization is required. */
1093 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1094 might be more bytes in the body. */
1095 if (auth_tried_already)
1097 /* If we have tried it already, then there is not point
1100 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1101 xfree (authenticate_h);
1104 else if (!known_authentication_scheme_p (authenticate_h))
1106 xfree (authenticate_h);
1107 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1110 else if (BEGINS_WITH (authenticate_h, "Basic"))
1112 /* The authentication scheme is basic, the one we try by
1113 default, and it failed. There's no sense in trying
1119 auth_tried_already = 1;
1123 /* We do not need this anymore. */
1126 xfree (authenticate_h);
1127 authenticate_h = NULL;
1130 /* 20x responses are counted among successful by default. */
1131 if (H_20X (statcode))
1134 /* Return if redirected. */
1135 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1137 /* RFC2068 says that in case of the 300 (multiple choices)
1138 response, the server can output a preferred URL through
1139 `Location' header; otherwise, the request should be treated
1140 like GET. So, if the location is set, it will be a
1141 redirection; otherwise, just proceed normally. */
1142 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1146 logprintf (LOG_VERBOSE,
1147 _("Location: %s%s\n"),
1148 hs->newloc ? hs->newloc : _("unspecified"),
1149 hs->newloc ? _(" [following]") : "");
1150 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1151 might be more bytes in the body. */
1153 FREE_MAYBE (all_headers);
1158 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
1161 /* We don't assume text/html by default. */
1164 if (opt.html_extension && (*dt & TEXTHTML))
1165 /* -E / --html-extension / html_extension = on was specified, and this is a
1166 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1167 already the file's suffix, tack on ".html". */
1169 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1171 if (last_period_in_local_filename == NULL ||
1172 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
1173 strcasecmp(last_period_in_local_filename, ".html") == EQ))
1175 size_t local_filename_len = strlen(*hs->local_file);
1177 *hs->local_file = xrealloc(*hs->local_file,
1178 local_filename_len + sizeof(".html"));
1179 strcpy(*hs->local_file + local_filename_len, ".html");
1181 *dt |= ADDED_HTML_EXTENSION;
1185 if (contrange == -1)
1187 /* We did not get a content-range header. This means that the
1188 server did not honor our `Range' request. Normally, this
1189 means we should reset hs->restval and continue normally. */
1191 /* However, if `-c' is used, we need to be a bit more careful:
1193 1. If `-c' is specified and the file already existed when
1194 Wget was started, it would be a bad idea for us to start
1195 downloading it from scratch, effectively truncating it. I
1196 believe this cannot happen unless `-c' was specified.
1198 2. If `-c' is used on a file that is already fully
1199 downloaded, we're requesting bytes after the end of file,
1200 which can result in server not honoring `Range'. If this is
1201 the case, `Content-Length' will be equal to the length of the
1203 if (opt.always_rest)
1205 /* Check for condition #2. */
1206 if (hs->restval > 0 /* restart was requested. */
1207 && contlen != -1 /* we got content-length. */
1208 && hs->restval >= contlen /* file fully downloaded
1212 logputs (LOG_VERBOSE, _("\
1213 \n The file is already fully retrieved; nothing to do.\n\n"));
1214 /* In case the caller inspects. */
1218 FREE_MAYBE (all_headers);
1219 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1220 might be more bytes in the body. */
1221 return RETRUNNEEDED;
1224 /* Check for condition #1. */
1225 if (hs->no_truncate)
1227 logprintf (LOG_NOTQUIET,
1230 Continued download failed on this file, which conflicts with `-c'.\n\
1231 Refusing to truncate existing file `%s'.\n\n"), *hs->local_file);
1233 FREE_MAYBE (all_headers);
1234 CLOSE_INVALIDATE (sock);
1235 return CONTNOTSUPPORTED;
1243 else if (contrange != hs->restval ||
1244 (H_PARTIAL (statcode) && contrange == -1))
1246 /* This means the whole request was somehow misunderstood by the
1247 server. Bail out. */
1249 FREE_MAYBE (all_headers);
1250 CLOSE_INVALIDATE (sock);
1257 contlen += contrange;
1259 contrange = -1; /* If conent-length was not sent,
1260 content-range will be ignored. */
1262 hs->contlen = contlen;
1266 if ((*dt & RETROKF) && !opt.server_response)
1268 /* No need to print this output if the body won't be
1269 downloaded at all, or if the original server response is
1271 logputs (LOG_VERBOSE, _("Length: "));
1274 logputs (LOG_VERBOSE, legible (contlen));
1275 if (contrange != -1)
1276 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1277 legible (contlen - contrange));
1280 logputs (LOG_VERBOSE,
1281 opt.ignore_length ? _("ignored") : _("unspecified"));
1283 logprintf (LOG_VERBOSE, " [%s]\n", type);
1285 logputs (LOG_VERBOSE, "\n");
1289 type = NULL; /* We don't need it any more. */
1291 /* Return if we have no intention of further downloading. */
1292 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1294 /* In case the caller cares to look... */
1298 FREE_MAYBE (all_headers);
1299 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1300 might be more bytes in the body. */
1301 return RETRFINISHED;
1304 /* Open the local file. */
1307 mkalldirs (*hs->local_file);
1309 rotate_backups (*hs->local_file);
1310 fp = fopen (*hs->local_file, hs->restval ? "ab" : "wb");
1313 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1314 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1315 might be more bytes in the body. */
1316 FREE_MAYBE (all_headers);
1322 extern int global_download_count;
1324 /* To ensure that repeated "from scratch" downloads work for -O
1325 files, we rewind the file pointer, unless restval is
1326 non-zero. (This works only when -O is used on regular files,
1327 but it's still a valuable feature.)
1329 However, this loses when more than one URL is specified on
1330 the command line the second rewinds eradicates the contents
1331 of the first download. Thus we disable the above trick for
1332 all the downloads except the very first one.
1334 #### A possible solution to this would be to remember the
1335 file position in the output document and to seek to that
1336 position, instead of rewinding. */
1337 if (!hs->restval && global_download_count == 0)
1339 /* This will silently fail for streams that don't correspond
1340 to regular files, but that's OK. */
1342 /* ftruncate is needed because opt.dfp is opened in append
1343 mode if opt.always_rest is set. */
1344 ftruncate (fileno (fp), 0);
1349 /* #### This confuses the code that checks for file size. There
1350 should be some overhead information. */
1351 if (opt.save_headers)
1352 fwrite (all_headers, 1, all_length, fp);
1354 /* Get the contents of the document. */
1355 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1356 (contlen != -1 ? contlen : 0),
1357 &rbuf, keep_alive, &hs->dltime);
1360 /* Close or flush the file. We have to be careful to check for
1361 error here. Checking the result of fwrite() is not enough --
1362 errors could go unnoticed! */
1365 flush_res = fclose (fp);
1367 flush_res = fflush (fp);
1368 if (flush_res == EOF)
1371 FREE_MAYBE (all_headers);
1372 CLOSE_FINISH (sock);
1375 return RETRFINISHED;
1378 /* The genuine HTTP loop! This is the part where the retrieval is
1379 retried, and retried, and retried, and... */
1381 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1382 int *dt, struct url *proxy)
1385 int use_ts, got_head = 0; /* time-stamping info */
1386 char *filename_plus_orig_suffix;
1387 char *local_filename = NULL;
1388 char *tms, *suf, *locf, *tmrate;
1390 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1391 long local_size = 0; /* the size of the local file */
1392 size_t filename_len;
1393 struct http_stat hstat; /* HTTP status */
1397 /* This used to be done in main(), but it's a better idea to do it
1398 here so that we don't go through the hoops if we're just using
1400 if (opt.cookies && opt.cookies_input && !cookies_loaded_p)
1402 load_cookies (opt.cookies_input);
1403 cookies_loaded_p = 1;
1408 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1409 has_wildcards_p because it would also warn on `?', and we know that
1410 shows up in CGI paths a *lot*. */
1411 if (strchr (u->url, '*'))
1412 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1414 /* Determine the local filename. */
1415 if (local_file && *local_file)
1416 hstat.local_file = local_file;
1417 else if (local_file)
1419 *local_file = url_filename (u);
1420 hstat.local_file = local_file;
1424 dummy = url_filename (u);
1425 hstat.local_file = &dummy;
1428 if (!opt.output_document)
1429 locf = *hstat.local_file;
1431 locf = opt.output_document;
1433 hstat.referer = referer;
1435 filename_len = strlen (*hstat.local_file);
1436 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1438 if (opt.noclobber && file_exists_p (*hstat.local_file))
1440 /* If opt.noclobber is turned on and file already exists, do not
1441 retrieve the file */
1442 logprintf (LOG_VERBOSE, _("\
1443 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
1444 /* If the file is there, we suppose it's retrieved OK. */
1447 /* #### Bogusness alert. */
1448 /* If its suffix is "html" or "htm", assume text/html. */
1449 if (((suf = suffix (*hstat.local_file)) != NULL)
1450 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
1458 if (opt.timestamping)
1460 boolean local_dot_orig_file_exists = FALSE;
1462 if (opt.backup_converted)
1463 /* If -K is specified, we'll act on the assumption that it was specified
1464 last time these files were downloaded as well, and instead of just
1465 comparing local file X against server file X, we'll compare local
1466 file X.orig (if extant, else X) against server file X. If -K
1467 _wasn't_ specified last time, or the server contains files called
1468 *.orig, -N will be back to not operating correctly with -k. */
1470 /* Would a single s[n]printf() call be faster? --dan
1472 Definitely not. sprintf() is horribly slow. It's a
1473 different question whether the difference between the two
1474 affects a program. Usually I'd say "no", but at one
1475 point I profiled Wget, and found that a measurable and
1476 non-negligible amount of time was lost calling sprintf()
1477 in url.c. Replacing sprintf with inline calls to
1478 strcpy() and long_to_string() made a difference.
1480 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
1481 memcpy (filename_plus_orig_suffix + filename_len,
1482 ".orig", sizeof (".orig"));
1484 /* Try to stat() the .orig file. */
1485 if (stat (filename_plus_orig_suffix, &st) == 0)
1487 local_dot_orig_file_exists = TRUE;
1488 local_filename = filename_plus_orig_suffix;
1492 if (!local_dot_orig_file_exists)
1493 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1494 if (stat (*hstat.local_file, &st) == 0)
1495 local_filename = *hstat.local_file;
1497 if (local_filename != NULL)
1498 /* There was a local file, so we'll check later to see if the version
1499 the server has is the same version we already have, allowing us to
1504 local_size = st.st_size;
1508 /* Reset the counter. */
1510 *dt = 0 | ACCEPTRANGES;
1514 /* Increment the pass counter. */
1516 sleep_between_retrievals (count);
1517 /* Get the current time string. */
1518 tms = time_str (NULL);
1519 /* Print fetch message, if opt.verbose. */
1522 char *hurl = url_string (u, 1);
1526 sprintf (tmp, _("(try:%2d)"), count);
1527 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1528 tms, hurl, tmp, locf);
1530 ws_changetitle (hurl, 1);
1535 /* Default document type is empty. However, if spider mode is
1536 on or time-stamping is employed, HEAD_ONLY commands is
1537 encoded within *dt. */
1538 if (opt.spider || (use_ts && !got_head))
1542 /* Assume no restarting. */
1544 /* Decide whether or not to restart. */
1545 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1546 /* #### this calls access() and then stat(); could be optimized. */
1547 && file_exists_p (locf))
1548 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1549 hstat.restval = st.st_size;
1551 /* In `-c' is used and the file is existing and non-empty,
1552 refuse to truncate it if the server doesn't support continued
1554 hstat.no_truncate = 0;
1555 if (opt.always_rest && hstat.restval)
1556 hstat.no_truncate = 1;
1558 /* Decide whether to send the no-cache directive. We send it in
1560 a) we're using a proxy, and we're past our first retrieval.
1561 Some proxies are notorious for caching incomplete data, so
1562 we require a fresh get.
1563 b) caching is explicitly inhibited. */
1564 if ((proxy && count > 1) /* a */
1565 || !opt.allow_cache /* b */
1567 *dt |= SEND_NOCACHE;
1569 *dt &= ~SEND_NOCACHE;
1571 /* Try fetching the document, or at least its head. */
1572 err = gethttp (u, &hstat, dt, proxy);
1574 /* It's unfortunate that wget determines the local filename before finding
1575 out the Content-Type of the file. Barring a major restructuring of the
1576 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1577 *hstat.local_file to tack on ".html". */
1578 if (!opt.output_document)
1579 locf = *hstat.local_file;
1581 locf = opt.output_document;
1584 tms = time_str (NULL);
1585 /* Get the new location (with or without the redirection). */
1587 *newloc = xstrdup (hstat.newloc);
1590 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1591 case CONERROR: case READERR: case WRITEFAILED:
1593 /* Non-fatal errors continue executing the loop, which will
1594 bring them to "while" statement at the end, to judge
1595 whether the number of tries was exceeded. */
1596 free_hstat (&hstat);
1597 printwhat (count, opt.ntry);
1600 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1601 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1602 /* Fatal errors just return from the function. */
1603 free_hstat (&hstat);
1607 case FWRITEERR: case FOPENERR:
1608 /* Another fatal error. */
1609 logputs (LOG_VERBOSE, "\n");
1610 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1611 *hstat.local_file, strerror (errno));
1612 free_hstat (&hstat);
1617 /* Another fatal error. */
1618 logputs (LOG_VERBOSE, "\n");
1619 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1620 free_hstat (&hstat);
1625 /* Return the new location to the caller. */
1628 logprintf (LOG_NOTQUIET,
1629 _("ERROR: Redirection (%d) without location.\n"),
1631 free_hstat (&hstat);
1635 free_hstat (&hstat);
1640 /* The file was already fully retrieved. */
1641 free_hstat (&hstat);
1646 /* Deal with you later. */
1649 /* All possibilities should have been exhausted. */
1652 if (!(*dt & RETROKF))
1656 /* #### Ugly ugly ugly! */
1657 char *hurl = url_string (u, 1);
1658 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1661 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1662 tms, hstat.statcode, hstat.error);
1663 logputs (LOG_VERBOSE, "\n");
1664 free_hstat (&hstat);
1669 /* Did we get the time-stamp? */
1672 if (opt.timestamping && !hstat.remote_time)
1674 logputs (LOG_NOTQUIET, _("\
1675 Last-modified header missing -- time-stamps turned off.\n"));
1677 else if (hstat.remote_time)
1679 /* Convert the date-string into struct tm. */
1680 tmr = http_atotm (hstat.remote_time);
1681 if (tmr == (time_t) (-1))
1682 logputs (LOG_VERBOSE, _("\
1683 Last-modified header invalid -- time-stamp ignored.\n"));
1687 /* The time-stamping section. */
1692 use_ts = 0; /* no more time-stamping */
1693 count = 0; /* the retrieve count for HEAD is
1695 if (hstat.remote_time && tmr != (time_t) (-1))
1697 /* Now time-stamping can be used validly. Time-stamping
1698 means that if the sizes of the local and remote file
1699 match, and local file is newer than the remote file,
1700 it will not be retrieved. Otherwise, the normal
1701 download procedure is resumed. */
1703 (hstat.contlen == -1 || local_size == hstat.contlen))
1705 logprintf (LOG_VERBOSE, _("\
1706 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1708 free_hstat (&hstat);
1712 else if (tml >= tmr)
1713 logprintf (LOG_VERBOSE, _("\
1714 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1716 logputs (LOG_VERBOSE,
1717 _("Remote file is newer, retrieving.\n"));
1719 free_hstat (&hstat);
1722 if ((tmr != (time_t) (-1))
1724 && ((hstat.len == hstat.contlen) ||
1725 ((hstat.res == 0) &&
1726 ((hstat.contlen == -1) ||
1727 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1729 /* #### This code repeats in http.c and ftp.c. Move it to a
1731 const char *fl = NULL;
1732 if (opt.output_document)
1734 if (opt.od_known_regular)
1735 fl = opt.output_document;
1738 fl = *hstat.local_file;
1742 /* End of time-stamping section. */
1746 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1751 tmrate = retr_rate (hstat.len - hstat.restval, hstat.dltime, 0);
1753 if (hstat.len == hstat.contlen)
1757 logprintf (LOG_VERBOSE,
1758 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1759 tms, tmrate, locf, hstat.len, hstat.contlen);
1760 logprintf (LOG_NONVERBOSE,
1761 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1762 tms, u->url, hstat.len, hstat.contlen, locf, count);
1765 downloaded_increase (hstat.len);
1767 /* Remember that we downloaded the file for later ".orig" code. */
1768 if (*dt & ADDED_HTML_EXTENSION)
1769 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1771 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1773 free_hstat (&hstat);
1777 else if (hstat.res == 0) /* No read error */
1779 if (hstat.contlen == -1) /* We don't know how much we were supposed
1780 to get, so assume we succeeded. */
1784 logprintf (LOG_VERBOSE,
1785 _("%s (%s) - `%s' saved [%ld]\n\n"),
1786 tms, tmrate, locf, hstat.len);
1787 logprintf (LOG_NONVERBOSE,
1788 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1789 tms, u->url, hstat.len, locf, count);
1792 downloaded_increase (hstat.len);
1794 /* Remember that we downloaded the file for later ".orig" code. */
1795 if (*dt & ADDED_HTML_EXTENSION)
1796 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1798 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1800 free_hstat (&hstat);
1804 else if (hstat.len < hstat.contlen) /* meaning we lost the
1805 connection too soon */
1807 logprintf (LOG_VERBOSE,
1808 _("%s (%s) - Connection closed at byte %ld. "),
1809 tms, tmrate, hstat.len);
1810 printwhat (count, opt.ntry);
1811 free_hstat (&hstat);
1814 else if (!opt.kill_longer) /* meaning we got more than expected */
1816 logprintf (LOG_VERBOSE,
1817 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1818 tms, tmrate, locf, hstat.len, hstat.contlen);
1819 logprintf (LOG_NONVERBOSE,
1820 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1821 tms, u->url, hstat.len, hstat.contlen, locf, count);
1823 downloaded_increase (hstat.len);
1825 /* Remember that we downloaded the file for later ".orig" code. */
1826 if (*dt & ADDED_HTML_EXTENSION)
1827 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1829 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1831 free_hstat (&hstat);
1835 else /* the same, but not accepted */
1837 logprintf (LOG_VERBOSE,
1838 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1839 tms, tmrate, hstat.len, hstat.contlen);
1840 printwhat (count, opt.ntry);
1841 free_hstat (&hstat);
1845 else /* now hstat.res can only be -1 */
1847 if (hstat.contlen == -1)
1849 logprintf (LOG_VERBOSE,
1850 _("%s (%s) - Read error at byte %ld (%s)."),
1851 tms, tmrate, hstat.len, strerror (errno));
1852 printwhat (count, opt.ntry);
1853 free_hstat (&hstat);
1856 else /* hstat.res == -1 and contlen is given */
1858 logprintf (LOG_VERBOSE,
1859 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1860 tms, tmrate, hstat.len, hstat.contlen,
1862 printwhat (count, opt.ntry);
1863 free_hstat (&hstat);
1870 while (!opt.ntry || (count < opt.ntry));
1874 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1875 than local timezone.
1877 mktime is similar but assumes struct tm, also known as the
1878 "broken-down" form of time, is in local time zone. mktime_from_utc
1879 uses mktime to make the conversion understanding that an offset
1880 will be introduced by the local time assumption.
1882 mktime_from_utc then measures the introduced offset by applying
1883 gmtime to the initial result and applying mktime to the resulting
1884 "broken-down" form. The difference between the two mktime results
1885 is the measured offset which is then subtracted from the initial
1886 mktime result to yield a calendar time which is the value returned.
1888 tm_isdst in struct tm is set to 0 to force mktime to introduce a
1889 consistent offset (the non DST offset) since tm and tm+o might be
1890 on opposite sides of a DST change.
1892 Some implementations of mktime return -1 for the nonexistent
1893 localtime hour at the beginning of DST. In this event, use
1894 mktime(tm - 1hr) + 3600.
1898 gmtime(t+o) --> tm+o
1899 mktime(tm+o) --> t+2o
1900 t+o - (t+2o - t+o) = t
1902 Note that glibc contains a function of the same purpose named
1903 `timegm' (reverse of gmtime). But obviously, it is not universally
1904 available, and unfortunately it is not straightforwardly
1905 extractable for use here. Perhaps configure should detect timegm
1906 and use it where available.
1908 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1909 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
1910 Further improved by Roger with assistance from Edward J. Sabol
1911 based on input by Jamie Zawinski. */
1914 mktime_from_utc (struct tm *t)
1925 return -1; /* can't deal with output from strptime */
1936 return -1; /* can't deal with output from gmtime */
1939 return (tl - (tb - tl));
1942 /* Check whether the result of strptime() indicates success.
1943 strptime() returns the pointer to how far it got to in the string.
1944 The processing has been successful if the string is at `GMT' or
1945 `+X', or at the end of the string.
1947 In extended regexp parlance, the function returns 1 if P matches
1948 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
1949 can return) is considered a failure and 0 is returned. */
1951 check_end (const char *p)
1955 while (ISSPACE (*p))
1958 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1959 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
1965 /* Convert the textual specification of time in TIME_STRING to the
1966 number of seconds since the Epoch.
1968 TIME_STRING can be in any of the three formats RFC2068 allows the
1969 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
1970 Timezones are ignored, and should be GMT.
1972 Return the computed time_t representation, or -1 if the conversion
1975 This function uses strptime with various string formats for parsing
1976 TIME_STRING. This results in a parser that is not as lenient in
1977 interpreting TIME_STRING as I would like it to be. Being based on
1978 strptime, it always allows shortened months, one-digit days, etc.,
1979 but due to the multitude of formats in which time can be
1980 represented, an ideal HTTP time parser would be even more
1981 forgiving. It should completely ignore things like week days and
1982 concentrate only on the various forms of representing years,
1983 months, days, hours, minutes, and seconds. For example, it would
1984 be nice if it accepted ISO 8601 out of the box.
1986 I've investigated free and PD code for this purpose, but none was
1987 usable. getdate was big and unwieldy, and had potential copyright
1988 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
1989 distributed with phttpd, is excellent, but we cannot use it because
1990 it is not assigned to the FSF. So I stuck it with strptime. */
1993 http_atotm (char *time_string)
1995 /* NOTE: Solaris strptime man page claims that %n and %t match white
1996 space, but that's not universally available. Instead, we simply
1997 use ` ' to mean "skip all WS", which works under all strptime
1998 implementations I've tested. */
2000 static const char *time_formats[] = {
2001 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
2002 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
2003 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
2004 (google.com uses this for their cookies.) */
2005 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2011 /* According to Roger Beeman, we need to initialize tm_isdst, since
2012 strptime won't do it. */
2015 /* Note that under foreign locales Solaris strptime() fails to
2016 recognize English dates, which renders this function useless. We
2017 solve this by being careful not to affect LC_TIME when
2018 initializing locale.
2020 Another solution would be to temporarily set locale to C, invoke
2021 strptime(), and restore it back. This is slow and dirty,
2022 however, and locale support other than LC_MESSAGES can mess other
2023 things, so I rather chose to stick with just setting LC_MESSAGES.
2025 GNU strptime does not have this problem because it recognizes
2026 both international and local dates. */
2028 for (i = 0; i < ARRAY_SIZE (time_formats); i++)
2029 if (check_end (strptime (time_string, time_formats[i], &t)))
2030 return mktime_from_utc (&t);
2032 /* All formats have failed. */
2036 /* Authorization support: We support two authorization schemes:
2038 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2040 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2041 consisting of answering to the server's challenge with the proper
2044 /* How many bytes it will take to store LEN bytes in base64. */
2045 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2047 /* Encode the string S of length LENGTH to base64 format and place it
2048 to STORE. STORE will be 0-terminated, and must point to a writable
2049 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2051 base64_encode (const char *s, char *store, int length)
2053 /* Conversion table. */
2054 static char tbl[64] = {
2055 'A','B','C','D','E','F','G','H',
2056 'I','J','K','L','M','N','O','P',
2057 'Q','R','S','T','U','V','W','X',
2058 'Y','Z','a','b','c','d','e','f',
2059 'g','h','i','j','k','l','m','n',
2060 'o','p','q','r','s','t','u','v',
2061 'w','x','y','z','0','1','2','3',
2062 '4','5','6','7','8','9','+','/'
2065 unsigned char *p = (unsigned char *)store;
2067 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2068 for (i = 0; i < length; i += 3)
2070 *p++ = tbl[s[0] >> 2];
2071 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2072 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2073 *p++ = tbl[s[2] & 0x3f];
2076 /* Pad the result if necessary... */
2077 if (i == length + 1)
2079 else if (i == length + 2)
2080 *(p - 1) = *(p - 2) = '=';
2081 /* ...and zero-terminate it. */
2085 /* Create the authentication header contents for the `Basic' scheme.
2086 This is done by encoding the string `USER:PASS' in base64 and
2087 prepending `HEADER: Basic ' to it. */
2089 basic_authentication_encode (const char *user, const char *passwd,
2092 char *t1, *t2, *res;
2093 int len1 = strlen (user) + 1 + strlen (passwd);
2094 int len2 = BASE64_LENGTH (len1);
2096 t1 = (char *)alloca (len1 + 1);
2097 sprintf (t1, "%s:%s", user, passwd);
2098 t2 = (char *)alloca (1 + len2);
2099 base64_encode (t1, t2, len1);
2100 res = (char *)xmalloc (len2 + 11 + strlen (header));
2101 sprintf (res, "%s: Basic %s\r\n", header, t2);
2107 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2108 of a field in such a header. If the field is the one specified by
2109 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2110 digest authorization code), extract its value in the (char*)
2111 variable pointed by RET. Returns negative on a malformed header,
2112 or number of bytes that have been parsed by this call. */
2114 extract_header_attr (const char *au, const char *attr_name, char **ret)
2116 const char *cp, *ep;
2120 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2122 cp += strlen (attr_name);
2125 cp += skip_lws (cp);
2130 cp += skip_lws (cp);
2135 for (ep = cp; *ep && *ep != '\"'; ep++)
2140 *ret = strdupdelim (cp, ep);
2147 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2148 an array of 16 bytes containing the hash keys, and BUF should be a
2149 buffer of 33 writable characters (32 for hex digits plus one for
2150 zero termination). */
2152 dump_hash (unsigned char *buf, const unsigned char *hash)
2156 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2158 *buf++ = XDIGIT_TO_xchar (*hash >> 4);
2159 *buf++ = XDIGIT_TO_xchar (*hash & 0xf);
2164 /* Take the line apart to find the challenge, and compose a digest
2165 authorization header. See RFC2069 section 2.1.2. */
2167 digest_authentication_encode (const char *au, const char *user,
2168 const char *passwd, const char *method,
2171 static char *realm, *opaque, *nonce;
2176 { "realm", &realm },
2177 { "opaque", &opaque },
2182 realm = opaque = nonce = NULL;
2184 au += 6; /* skip over `Digest' */
2189 au += skip_lws (au);
2190 for (i = 0; i < ARRAY_SIZE (options); i++)
2192 int skip = extract_header_attr (au, options[i].name,
2193 options[i].variable);
2197 FREE_MAYBE (opaque);
2207 if (i == ARRAY_SIZE (options))
2209 while (*au && *au != '=')
2213 au += skip_lws (au);
2217 while (*au && *au != '\"')
2224 while (*au && *au != ',')
2229 if (!realm || !nonce || !user || !passwd || !path || !method)
2232 FREE_MAYBE (opaque);
2237 /* Calculate the digest value. */
2239 ALLOCA_MD5_CONTEXT (ctx);
2240 unsigned char hash[MD5_HASHLEN];
2241 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2242 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2244 /* A1BUF = H(user ":" realm ":" password) */
2246 gen_md5_update (user, strlen (user), ctx);
2247 gen_md5_update (":", 1, ctx);
2248 gen_md5_update (realm, strlen (realm), ctx);
2249 gen_md5_update (":", 1, ctx);
2250 gen_md5_update (passwd, strlen (passwd), ctx);
2251 gen_md5_finish (ctx, hash);
2252 dump_hash (a1buf, hash);
2254 /* A2BUF = H(method ":" path) */
2256 gen_md5_update (method, strlen (method), ctx);
2257 gen_md5_update (":", 1, ctx);
2258 gen_md5_update (path, strlen (path), ctx);
2259 gen_md5_finish (ctx, hash);
2260 dump_hash (a2buf, hash);
2262 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2264 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2265 gen_md5_update (":", 1, ctx);
2266 gen_md5_update (nonce, strlen (nonce), ctx);
2267 gen_md5_update (":", 1, ctx);
2268 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2269 gen_md5_finish (ctx, hash);
2270 dump_hash (response_digest, hash);
2272 res = (char*) xmalloc (strlen (user)
2277 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2278 + (opaque ? strlen (opaque) : 0)
2280 sprintf (res, "Authorization: Digest \
2281 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2282 user, realm, nonce, path, response_digest);
2285 char *p = res + strlen (res);
2286 strcat (p, ", opaque=\"");
2290 strcat (res, "\r\n");
2294 #endif /* USE_DIGEST */
2297 #define BEGINS_WITH(line, string_constant) \
2298 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2299 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2300 || !line[sizeof (string_constant) - 1]))
2303 known_authentication_scheme_p (const char *au)
2305 return BEGINS_WITH (au, "Basic")
2306 || BEGINS_WITH (au, "Digest")
2307 || BEGINS_WITH (au, "NTLM");
2312 /* Create the HTTP authorization request header. When the
2313 `WWW-Authenticate' response header is seen, according to the
2314 authorization scheme specified in that header (`Basic' and `Digest'
2315 are supported by the current implementation), produce an
2316 appropriate HTTP authorization request header. */
2318 create_authorization_line (const char *au, const char *user,
2319 const char *passwd, const char *method,
2322 char *wwwauth = NULL;
2324 if (!strncasecmp (au, "Basic", 5))
2325 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2326 if (!strncasecmp (au, "NTLM", 4))
2327 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2329 else if (!strncasecmp (au, "Digest", 6))
2330 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2331 #endif /* USE_DIGEST */
2338 if (pc_last_host_ip)
2339 address_list_release (pc_last_host_ip);