2 Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GNU Wget.
7 GNU Wget is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GNU Wget is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Wget; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25 #include <sys/types.h>
36 #if TIME_WITH_SYS_TIME
37 # include <sys/time.h>
41 # include <sys/time.h>
58 # include "gen_sslfunc.h"
65 extern char *version_string;
71 static int cookies_loaded_p;
72 struct cookie_jar *wget_cookie_jar;
74 #define TEXTHTML_S "text/html"
75 #define HTTP_ACCEPT "*/*"
77 /* Some status code validation macros: */
78 #define H_20X(x) (((x) >= 200) && ((x) < 300))
79 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
80 #define H_REDIRECTED(x) (((x) == HTTP_STATUS_MOVED_PERMANENTLY) \
81 || ((x) == HTTP_STATUS_MOVED_TEMPORARILY))
83 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
85 #define HTTP_STATUS_OK 200
86 #define HTTP_STATUS_CREATED 201
87 #define HTTP_STATUS_ACCEPTED 202
88 #define HTTP_STATUS_NO_CONTENT 204
89 #define HTTP_STATUS_PARTIAL_CONTENTS 206
91 /* Redirection 3xx. */
92 #define HTTP_STATUS_MULTIPLE_CHOICES 300
93 #define HTTP_STATUS_MOVED_PERMANENTLY 301
94 #define HTTP_STATUS_MOVED_TEMPORARILY 302
95 #define HTTP_STATUS_NOT_MODIFIED 304
97 /* Client error 4xx. */
98 #define HTTP_STATUS_BAD_REQUEST 400
99 #define HTTP_STATUS_UNAUTHORIZED 401
100 #define HTTP_STATUS_FORBIDDEN 403
101 #define HTTP_STATUS_NOT_FOUND 404
103 /* Server errors 5xx. */
104 #define HTTP_STATUS_INTERNAL 500
105 #define HTTP_STATUS_NOT_IMPLEMENTED 501
106 #define HTTP_STATUS_BAD_GATEWAY 502
107 #define HTTP_STATUS_UNAVAILABLE 503
110 /* Parse the HTTP status line, which is of format:
112 HTTP-Version SP Status-Code SP Reason-Phrase
114 The function returns the status-code, or -1 if the status line is
115 malformed. The pointer to reason-phrase is returned in RP. */
117 parse_http_status_line (const char *line, const char **reason_phrase_ptr)
119 /* (the variables must not be named `major' and `minor', because
120 that breaks compilation with SunOS4 cc.) */
121 int mjr, mnr, statcode;
124 *reason_phrase_ptr = NULL;
126 /* The standard format of HTTP-Version is: `HTTP/X.Y', where X is
127 major version, and Y is minor version. */
128 if (strncmp (line, "HTTP/", 5) != 0)
132 /* Calculate major HTTP version. */
134 for (mjr = 0; ISDIGIT (*line); line++)
135 mjr = 10 * mjr + (*line - '0');
136 if (*line != '.' || p == line)
140 /* Calculate minor HTTP version. */
142 for (mnr = 0; ISDIGIT (*line); line++)
143 mnr = 10 * mnr + (*line - '0');
144 if (*line != ' ' || p == line)
146 /* Wget will accept only 1.0 and higher HTTP-versions. The value of
147 minor version can be safely ignored. */
152 /* Calculate status code. */
153 if (!(ISDIGIT (*line) && ISDIGIT (line[1]) && ISDIGIT (line[2])))
155 statcode = 100 * (*line - '0') + 10 * (line[1] - '0') + (line[2] - '0');
157 /* Set up the reason phrase pointer. */
159 /* RFC2068 requires SPC here, but we allow the string to finish
160 here, in case no reason-phrase is present. */
164 *reason_phrase_ptr = line;
169 *reason_phrase_ptr = line + 1;
174 #define WMIN(x, y) ((x) > (y) ? (y) : (x))
176 /* Send the contents of FILE_NAME to SOCK/SSL. Make sure that exactly
177 PROMISED_SIZE bytes are sent over the wire -- if the file is
178 longer, read only that much; if the file is shorter, pad it with
182 post_file (int sock, void *ssl, const char *file_name, long promised_size)
184 static char chunk[8192];
189 /* Only one of SOCK and SSL may be active at the same time. */
190 assert (sock > -1 || ssl != NULL);
191 assert (sock == -1 || ssl == NULL);
193 DEBUGP (("[writing POST file %s ... ", file_name));
195 fp = fopen (file_name, "rb");
198 while (written < promised_size)
201 int length = fread (chunk, 1, sizeof (chunk), fp);
204 towrite = WMIN (promised_size - written, length);
207 write_error = ssl_iwrite (ssl, chunk, towrite);
210 write_error = iwrite (sock, chunk, towrite);
221 if (written < promised_size)
223 /* This highly unlikely case can happen only if the file has
224 shrunk under us. To uphold the promise that exactly
225 promised_size bytes would be delivered, pad the remaining
226 data with zeros. #### Should we abort instead? */
227 DEBUGP (("padding %ld bytes ... ", promised_size - written));
228 memset (chunk, '\0', sizeof (chunk));
229 while (written < promised_size)
231 int towrite = WMIN (promised_size - written, sizeof (chunk));
234 write_error = ssl_iwrite (ssl, chunk, towrite);
237 write_error = iwrite (sock, chunk, towrite);
243 assert (written == promised_size);
244 DEBUGP (("done]\n"));
248 /* Functions to be used as arguments to header_process(): */
250 struct http_process_range_closure {
256 /* Parse the `Content-Range' header and extract the information it
257 contains. Returns 1 if successful, -1 otherwise. */
259 http_process_range (const char *hdr, void *arg)
261 struct http_process_range_closure *closure
262 = (struct http_process_range_closure *)arg;
265 /* Certain versions of Nutscape proxy server send out
266 `Content-Length' without "bytes" specifier, which is a breach of
267 RFC2068 (as well as the HTTP/1.1 draft which was current at the
268 time). But hell, I must support it... */
269 if (!strncasecmp (hdr, "bytes", 5))
272 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
276 hdr += skip_lws (hdr);
282 for (num = 0; ISDIGIT (*hdr); hdr++)
283 num = 10 * num + (*hdr - '0');
284 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
286 closure->first_byte_pos = num;
288 for (num = 0; ISDIGIT (*hdr); hdr++)
289 num = 10 * num + (*hdr - '0');
290 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
292 closure->last_byte_pos = num;
294 for (num = 0; ISDIGIT (*hdr); hdr++)
295 num = 10 * num + (*hdr - '0');
296 closure->entity_length = num;
300 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
301 Used for `Accept-Ranges'. */
303 http_process_none (const char *hdr, void *arg)
305 int *where = (int *)arg;
307 if (strstr (hdr, "none"))
314 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
316 http_process_type (const char *hdr, void *arg)
318 char **result = (char **)arg;
319 /* Locate P on `;' or the terminating zero, whichever comes first. */
320 const char *p = strchr (hdr, ';');
322 p = hdr + strlen (hdr);
323 while (p > hdr && ISSPACE (*(p - 1)))
325 *result = strdupdelim (hdr, p);
329 /* Check whether the `Connection' header is set to "keep-alive". */
331 http_process_connection (const char *hdr, void *arg)
333 int *flag = (int *)arg;
334 if (!strcasecmp (hdr, "Keep-Alive"))
339 /* Commit the cookie to the cookie jar. */
342 http_process_set_cookie (const char *hdr, void *arg)
344 struct url *u = (struct url *)arg;
346 /* The jar should have been created by now. */
347 assert (wget_cookie_jar != NULL);
349 cookie_jar_process_set_cookie (wget_cookie_jar, u->host, u->port, u->path,
355 /* Persistent connections. Currently, we cache the most recently used
356 connection as persistent, provided that the HTTP server agrees to
357 make it such. The persistence data is stored in the variables
358 below. Ideally, it would be in a structure, and it should be
359 possible to cache an arbitrary fixed number of these connections.
361 I think the code is quite easy to extend in that direction. */
363 /* Whether a persistent connection is active. */
364 static int pc_active_p;
365 /* Host and port of currently active persistent connection. */
366 static struct address_list *pc_last_host_ip;
367 static unsigned short pc_last_port;
369 /* File descriptor of the currently active persistent connection. */
370 static int pc_last_fd;
373 /* Whether a ssl handshake has occoured on this connection */
374 static int pc_active_ssl;
375 /* SSL connection of the currently active persistent connection. */
376 static SSL *pc_last_ssl;
377 #endif /* HAVE_SSL */
379 /* Mark the persistent connection as invalid. This is used by the
380 CLOSE_* macros after they forcefully close a registered persistent
381 connection. This does not close the file descriptor -- it is left
382 to the caller to do that. (Maybe it should, though.) */
385 invalidate_persistent (void)
390 #endif /* HAVE_SSL */
391 if (pc_last_host_ip != NULL)
393 address_list_release (pc_last_host_ip);
394 pc_last_host_ip = NULL;
396 DEBUGP (("Invalidating fd %d from further reuse.\n", pc_last_fd));
399 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
400 persistent. This will enable someone to use the same connection
401 later. In the context of HTTP, this must be called only AFTER the
402 response has been received and the server has promised that the
403 connection will remain alive.
405 If a previous connection was persistent, it is closed. */
409 register_persistent (const char *host, unsigned short port, int fd, SSL *ssl)
413 register_persistent (const char *host, unsigned short port, int fd)
418 if (pc_last_fd == fd)
420 /* The connection FD is already registered. Nothing to
426 /* The old persistent connection is still active; let's
427 close it first. This situation arises whenever a
428 persistent connection exists, but we then connect to a
429 different host, and try to register a persistent
430 connection to that one. */
432 /* The ssl disconnect has to take place before the closing
435 shutdown_ssl(pc_last_ssl);
438 invalidate_persistent ();
442 assert (pc_last_host_ip == NULL);
444 /* This lookup_host cannot fail, because it has the results in the
446 pc_last_host_ip = lookup_host (host, 1);
447 assert (pc_last_host_ip != NULL);
454 pc_active_ssl = ssl ? 1 : 0;
456 DEBUGP (("Registered fd %d for persistent reuse.\n", fd));
460 # define SHUTDOWN_SSL(ssl) do { \
462 shutdown_ssl (ssl); \
465 # define SHUTDOWN_SSL(ssl)
468 /* Return non-zero if a persistent connection is available for
469 connecting to HOST:PORT. */
473 persistent_available_p (const char *host, unsigned short port, int ssl)
477 persistent_available_p (const char *host, unsigned short port)
481 struct address_list *this_host_ip;
483 /* First, check whether a persistent connection is active at all. */
486 /* Second, check if the active connection pertains to the correct
487 (HOST, PORT) ordered pair. */
488 if (port != pc_last_port)
492 /* Second, a): check if current connection is (not) ssl, too. This
493 test is unlikely to fail because HTTP and HTTPS typicaly use
494 different ports. Yet it is possible, or so I [Christian
495 Fraenkel] have been told, to run HTTPS and HTTP simultaneus on
497 if (ssl != pc_active_ssl)
499 #endif /* HAVE_SSL */
501 this_host_ip = lookup_host (host, 1);
505 /* To equate the two host names for the purposes of persistent
506 connections, they need to share all the IP addresses in the
508 success = address_list_match_all (pc_last_host_ip, this_host_ip);
509 address_list_release (this_host_ip);
513 /* Third: check whether the connection is still open. This is
514 important because most server implement a liberal (short) timeout
515 on persistent connections. Wget can of course always reconnect
516 if the connection doesn't work out, but it's nicer to know in
517 advance. This test is a logical followup of the first test, but
518 is "expensive" and therefore placed at the end of the list. */
519 if (!test_socket_open (pc_last_fd))
521 /* Oops, the socket is no longer open. Now that we know that,
522 let's invalidate the persistent connection before returning
526 SHUTDOWN_SSL (pc_last_ssl);
529 invalidate_persistent ();
535 /* The idea behind these two CLOSE macros is to distinguish between
536 two cases: one when the job we've been doing is finished, and we
537 want to close the connection and leave, and two when something is
538 seriously wrong and we're closing the connection as part of
541 In case of keep_alive, CLOSE_FINISH should leave the connection
542 open, while CLOSE_INVALIDATE should still close it.
544 Note that the semantics of the flag `keep_alive' is "this
545 connection *will* be reused (the server has promised not to close
546 the connection once we're done)", while the semantics of
547 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
548 active, registered connection". */
550 #define CLOSE_FINISH(fd) do { \
553 SHUTDOWN_SSL (ssl); \
555 if (pc_active_p && (fd) == pc_last_fd) \
556 invalidate_persistent (); \
560 #define CLOSE_INVALIDATE(fd) do { \
561 SHUTDOWN_SSL (ssl); \
563 if (pc_active_p && (fd) == pc_last_fd) \
564 invalidate_persistent (); \
569 long len; /* received length */
570 long contlen; /* expected length */
571 long restval; /* the restart value */
572 int res; /* the result of last read */
573 char *newloc; /* new location (redirection) */
574 char *remote_time; /* remote time-stamp string */
575 char *error; /* textual HTTP error */
576 int statcode; /* status code */
577 long dltime; /* time of the download */
578 int no_truncate; /* whether truncating the file is
580 const char *referer; /* value of the referer header. */
581 char **local_file; /* local file. */
585 free_hstat (struct http_stat *hs)
587 FREE_MAYBE (hs->newloc);
588 FREE_MAYBE (hs->remote_time);
589 FREE_MAYBE (hs->error);
591 /* Guard against being called twice. */
593 hs->remote_time = NULL;
597 static char *create_authorization_line PARAMS ((const char *, const char *,
598 const char *, const char *,
600 static char *basic_authentication_encode PARAMS ((const char *, const char *,
602 static int known_authentication_scheme_p PARAMS ((const char *));
604 time_t http_atotm PARAMS ((const char *));
606 #define BEGINS_WITH(line, string_constant) \
607 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
608 && (ISSPACE (line[sizeof (string_constant) - 1]) \
609 || !line[sizeof (string_constant) - 1]))
611 /* Retrieve a document through HTTP protocol. It recognizes status
612 code, and correctly handles redirections. It closes the network
613 socket. If it receives an error from the functions below it, it
614 will print it if there is enough information to do so (almost
615 always), returning the error to the caller (i.e. http_loop).
617 Various HTTP parameters are stored to hs. Although it parses the
618 response code correctly, it is not used in a sane way. The caller
621 If PROXY is non-NULL, the connection will be made to the proxy
622 server, and u->url will be requested. */
624 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
626 char *request, *type, *command, *full_path;
628 char *pragma_h, *referer, *useragent, *range, *wwwauth;
629 char *authenticate_h;
633 char *request_keep_alive;
634 int sock, hcount, all_length, statcode;
636 long contlen, contrange;
639 int auth_tried_already;
642 static SSL_CTX *ssl_ctx = NULL;
645 char *cookies = NULL;
647 /* Whether this connection will be kept alive after the HTTP request
651 /* Flags that detect the two ways of specifying HTTP keep-alive
653 int http_keep_alive_1, http_keep_alive_2;
655 /* Whether keep-alive should be inhibited. */
656 int inhibit_keep_alive;
658 /* Whether we need to print the host header with braces around host,
659 e.g. "Host: [3ffe:8100:200:2::2]:1234" instead of the usual
660 "Host: symbolic-name:1234". */
661 int squares_around_host = 0;
663 /* Headers sent when using POST. */
664 char *post_content_type, *post_content_length;
665 long post_data_size = 0;
668 /* initialize ssl_ctx on first run */
671 uerr_t err = init_ssl (&ssl_ctx);
676 case SSLERRCTXCREATE:
678 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
682 /* try without certfile */
683 logprintf (LOG_NOTQUIET,
684 _("Failed to load certificates from %s\n"),
687 logprintf (LOG_NOTQUIET,
688 _("Trying without the specified certificate\n"));
691 logprintf (LOG_NOTQUIET,
692 _("Failed to get certificate key from %s\n"),
695 logprintf (LOG_NOTQUIET,
696 _("Trying without the specified certificate\n"));
703 #endif /* HAVE_SSL */
705 if (!(*dt & HEAD_ONLY))
706 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
707 know the local filename so we can save to it. */
708 assert (*hs->local_file != NULL);
711 auth_tried_already = 0;
713 inhibit_keep_alive = !opt.http_keep_alive || proxy != NULL;
716 /* We need to come back here when the initial attempt to retrieve
717 without authorization header fails. (Expected to happen at least
718 for the Digest authorization scheme.) */
721 http_keep_alive_1 = http_keep_alive_2 = 0;
723 post_content_type = NULL;
724 post_content_length = NULL;
726 /* Initialize certain elements of struct http_stat. */
731 hs->remote_time = NULL;
734 /* If we're using a proxy, we will be connecting to the proxy
736 conn = proxy ? proxy : u;
738 /* First: establish the connection. */
739 if (inhibit_keep_alive
742 !persistent_available_p (conn->host, conn->port)
744 !persistent_available_p (conn->host, conn->port,
745 u->scheme == SCHEME_HTTPS)
746 #endif /* HAVE_SSL */
749 struct address_list *al = lookup_host (conn->host, 0);
752 set_connection_host_name (conn->host);
753 sock = connect_to_many (al, conn->port, 0);
754 set_connection_host_name (NULL);
755 address_list_release (al);
758 return errno == ECONNREFUSED ? CONREFUSED : CONERROR;
761 if (conn->scheme == SCHEME_HTTPS)
762 if (connect_ssl (&ssl, ssl_ctx,sock) != 0)
764 logputs (LOG_VERBOSE, "\n");
765 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
770 #endif /* HAVE_SSL */
774 logprintf (LOG_VERBOSE, _("Reusing connection to %s:%hu.\n"),
775 conn->host, conn->port);
776 /* #### pc_last_fd should be accessed through an accessor
781 #endif /* HAVE_SSL */
782 DEBUGP (("Reusing fd %d.\n", sock));
787 else if (opt.post_file_name || opt.post_data)
795 referer = (char *)alloca (9 + strlen (hs->referer) + 3);
796 sprintf (referer, "Referer: %s\r\n", hs->referer);
799 if (*dt & SEND_NOCACHE)
800 pragma_h = "Pragma: no-cache\r\n";
806 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
807 /* Gag me! Some servers (e.g. WebSitePro) have been known to
808 respond to the following `Range' format by generating a
809 multipart/x-byte-ranges MIME document! This MIME type was
810 present in an old draft of the byteranges specification.
811 HTTP/1.1 specifies a multipart/byte-ranges MIME type, but
812 only if multiple non-overlapping ranges are requested --
813 which Wget never does. */
814 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
819 STRDUP_ALLOCA (useragent, opt.useragent);
822 useragent = (char *)alloca (10 + strlen (version_string));
823 sprintf (useragent, "Wget/%s", version_string);
825 /* Construct the authentication, if userid is present. */
828 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
829 user = user ? user : opt.http_user;
830 passwd = passwd ? passwd : opt.http_passwd;
837 /* We have the username and the password, but haven't tried
838 any authorization yet. Let's see if the "Basic" method
839 works. If not, we'll come back here and construct a
840 proper authorization method with the right challenges.
842 If we didn't employ this kind of logic, every URL that
843 requires authorization would have to be processed twice,
844 which is very suboptimal and generates a bunch of false
845 "unauthorized" errors in the server log.
847 #### But this logic also has a serious problem when used
848 with stronger authentications: we *first* transmit the
849 username and the password in clear text, and *then*
850 attempt a stronger authentication scheme. That cannot be
851 right! We are only fortunate that almost everyone still
852 uses the `Basic' scheme anyway.
854 There should be an option to prevent this from happening,
855 for those who use strong authentication schemes and value
857 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
861 /* Use the full path, i.e. one that includes the leading
862 slash and the query string, but is independent of proxy
864 char *pth = url_full_path (u);
865 wwwauth = create_authorization_line (authenticate_h, user, passwd,
874 char *proxy_user, *proxy_passwd;
875 /* For normal username and password, URL components override
876 command-line/wgetrc parameters. With proxy authentication,
877 it's the reverse, because proxy URLs are normally the
878 "permanent" ones, so command-line args should take
880 if (opt.proxy_user && opt.proxy_passwd)
882 proxy_user = opt.proxy_user;
883 proxy_passwd = opt.proxy_passwd;
887 proxy_user = proxy->user;
888 proxy_passwd = proxy->passwd;
890 /* #### This does not appear right. Can't the proxy request,
891 say, `Digest' authentication? */
892 if (proxy_user && proxy_passwd)
893 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
894 "Proxy-Authorization");
897 /* String of the form :PORT. Used only for non-standard ports. */
899 if (u->port != scheme_default_port (u->scheme))
901 port_maybe = (char *)alloca (numdigit (u->port) + 2);
902 sprintf (port_maybe, ":%d", u->port);
905 if (!inhibit_keep_alive)
906 request_keep_alive = "Connection: Keep-Alive\r\n";
908 request_keep_alive = NULL;
911 cookies = cookie_jar_generate_cookie_header (wget_cookie_jar, u->host,
914 u->scheme == SCHEME_HTTPS
920 if (opt.post_data || opt.post_file_name)
922 post_content_type = "Content-Type: application/x-www-form-urlencoded\r\n";
924 post_data_size = strlen (opt.post_data);
927 post_data_size = file_size (opt.post_file_name);
928 if (post_data_size == -1)
930 logprintf (LOG_NOTQUIET, "POST data file missing: %s\n",
935 post_content_length = xmalloc (16 + numdigit (post_data_size) + 2 + 1);
936 sprintf (post_content_length,
937 "Content-Length: %ld\r\n", post_data_size);
941 full_path = xstrdup (u->url);
943 /* Use the full path, i.e. one that includes the leading slash and
944 the query string. E.g. if u->path is "foo/bar" and u->query is
945 "param=value", full_path will be "/foo/bar?param=value". */
946 full_path = url_full_path (u);
948 if (strchr (u->host, ':'))
949 squares_around_host = 1;
951 /* Allocate the memory for the request. */
952 request = (char *)alloca (strlen (command)
956 + (port_maybe ? strlen (port_maybe) : 0)
957 + strlen (HTTP_ACCEPT)
958 + (request_keep_alive
959 ? strlen (request_keep_alive) : 0)
960 + (referer ? strlen (referer) : 0)
961 + (cookies ? strlen (cookies) : 0)
962 + (wwwauth ? strlen (wwwauth) : 0)
963 + (proxyauth ? strlen (proxyauth) : 0)
964 + (range ? strlen (range) : 0)
967 ? strlen (post_content_type) : 0)
968 + (post_content_length
969 ? strlen (post_content_length) : 0)
970 + (opt.user_header ? strlen (opt.user_header) : 0)
972 /* Construct the request. */
978 %s%s%s%s%s%s%s%s%s%s\r\n",
981 squares_around_host ? "[" : "", u->host, squares_around_host ? "]" : "",
982 port_maybe ? port_maybe : "",
984 request_keep_alive ? request_keep_alive : "",
985 referer ? referer : "",
986 cookies ? cookies : "",
987 wwwauth ? wwwauth : "",
988 proxyauth ? proxyauth : "",
991 post_content_type ? post_content_type : "",
992 post_content_length ? post_content_length : "",
993 opt.user_header ? opt.user_header : "");
994 DEBUGP (("---request begin---\n%s", request));
996 /* Free the temporary memory. */
997 FREE_MAYBE (wwwauth);
998 FREE_MAYBE (proxyauth);
999 FREE_MAYBE (cookies);
1002 /* Send the request to server. */
1004 if (conn->scheme == SCHEME_HTTPS)
1005 write_error = ssl_iwrite (ssl, request, strlen (request));
1008 write_error = iwrite (sock, request, strlen (request));
1010 if (write_error >= 0)
1014 DEBUGP (("[POST data: %s]\n", opt.post_data));
1016 if (conn->scheme == SCHEME_HTTPS)
1017 write_error = ssl_iwrite (ssl, opt.post_data, post_data_size);
1020 write_error = iwrite (sock, opt.post_data, post_data_size);
1022 else if (opt.post_file_name)
1025 if (conn->scheme == SCHEME_HTTPS)
1026 write_error = post_file (-1, ssl, opt.post_file_name,
1030 write_error = post_file (sock, NULL, opt.post_file_name,
1034 DEBUGP (("---request end---\n"));
1036 if (write_error < 0)
1038 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
1040 CLOSE_INVALIDATE (sock);
1043 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1044 proxy ? "Proxy" : "HTTP");
1045 contlen = contrange = -1;
1050 /* Before reading anything, initialize the rbuf. */
1051 rbuf_initialize (&rbuf, sock);
1053 if (conn->scheme == SCHEME_HTTPS)
1057 #endif /* HAVE_SSL */
1060 /* Header-fetching loop. */
1068 /* Get the header. */
1069 status = header_get (&rbuf, &hdr,
1070 /* Disallow continuations for status line. */
1071 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
1073 /* Check for errors. */
1074 if (status == HG_EOF && *hdr)
1076 /* This used to be an unconditional error, but that was
1077 somewhat controversial, because of a large number of
1078 broken CGI's that happily "forget" to send the second EOL
1079 before closing the connection of a HEAD request.
1081 So, the deal is to check whether the header is empty
1082 (*hdr is zero if it is); if yes, it means that the
1083 previous header was fully retrieved, and that -- most
1084 probably -- the request is complete. "...be liberal in
1085 what you accept." Oh boy. */
1086 logputs (LOG_VERBOSE, "\n");
1087 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
1090 FREE_MAYBE (all_headers);
1091 CLOSE_INVALIDATE (sock);
1094 else if (status == HG_ERROR)
1096 logputs (LOG_VERBOSE, "\n");
1097 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1101 FREE_MAYBE (all_headers);
1102 CLOSE_INVALIDATE (sock);
1106 /* If the headers are to be saved to a file later, save them to
1108 if (opt.save_headers)
1110 int lh = strlen (hdr);
1111 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
1112 memcpy (all_headers + all_length, hdr, lh);
1114 all_headers[all_length++] = '\n';
1115 all_headers[all_length] = '\0';
1118 /* Check for status line. */
1122 /* Parse the first line of server response. */
1123 statcode = parse_http_status_line (hdr, &error);
1124 hs->statcode = statcode;
1125 /* Store the descriptive response. */
1126 if (statcode == -1) /* malformed response */
1128 /* A common reason for "malformed response" error is the
1129 case when no data was actually received. Handle this
1132 hs->error = xstrdup (_("No data received"));
1134 hs->error = xstrdup (_("Malformed status line"));
1139 hs->error = xstrdup (_("(no description)"));
1141 hs->error = xstrdup (error);
1143 if ((statcode != -1)
1149 if (opt.server_response)
1150 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
1152 logprintf (LOG_VERBOSE, "%2d %s", statcode, error);
1158 /* Exit on empty header. */
1165 /* Print the header if requested. */
1166 if (opt.server_response && hcount != 1)
1167 logprintf (LOG_VERBOSE, "\n%2d %s", hcount, hdr);
1169 /* Try getting content-length. */
1170 if (contlen == -1 && !opt.ignore_length)
1171 if (header_process (hdr, "Content-Length", header_extract_number,
1174 /* Try getting content-type. */
1176 if (header_process (hdr, "Content-Type", http_process_type, &type))
1178 /* Try getting location. */
1180 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
1182 /* Try getting last-modified. */
1183 if (!hs->remote_time)
1184 if (header_process (hdr, "Last-Modified", header_strdup,
1187 /* Try getting cookies. */
1189 if (header_process (hdr, "Set-Cookie", http_process_set_cookie, u))
1191 /* Try getting www-authentication. */
1192 if (!authenticate_h)
1193 if (header_process (hdr, "WWW-Authenticate", header_strdup,
1196 /* Check for accept-ranges header. If it contains the word
1197 `none', disable the ranges. */
1198 if (*dt & ACCEPTRANGES)
1201 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
1204 *dt &= ~ACCEPTRANGES;
1208 /* Try getting content-range. */
1209 if (contrange == -1)
1211 struct http_process_range_closure closure;
1212 if (header_process (hdr, "Content-Range", http_process_range, &closure))
1214 contrange = closure.first_byte_pos;
1218 /* Check for keep-alive related responses. */
1219 if (!inhibit_keep_alive)
1221 /* Check for the `Keep-Alive' header. */
1222 if (!http_keep_alive_1)
1224 if (header_process (hdr, "Keep-Alive", header_exists,
1225 &http_keep_alive_1))
1228 /* Check for `Connection: Keep-Alive'. */
1229 if (!http_keep_alive_2)
1231 if (header_process (hdr, "Connection", http_process_connection,
1232 &http_keep_alive_2))
1240 logputs (LOG_VERBOSE, "\n");
1243 && (http_keep_alive_1 || http_keep_alive_2))
1245 assert (inhibit_keep_alive == 0);
1249 /* The server has promised that it will not close the connection
1250 when we're done. This means that we can register it. */
1252 register_persistent (conn->host, conn->port, sock);
1254 register_persistent (conn->host, conn->port, sock, ssl);
1255 #endif /* HAVE_SSL */
1257 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
1260 /* Authorization is required. */
1264 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1265 might be more bytes in the body. */
1266 if (auth_tried_already)
1268 /* If we have tried it already, then there is not point
1271 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1272 xfree (authenticate_h);
1275 else if (!known_authentication_scheme_p (authenticate_h))
1277 xfree (authenticate_h);
1278 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1281 else if (BEGINS_WITH (authenticate_h, "Basic"))
1283 /* The authentication scheme is basic, the one we try by
1284 default, and it failed. There's no sense in trying
1290 auth_tried_already = 1;
1294 /* We do not need this anymore. */
1297 xfree (authenticate_h);
1298 authenticate_h = NULL;
1301 /* 20x responses are counted among successful by default. */
1302 if (H_20X (statcode))
1305 /* Return if redirected. */
1306 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1308 /* RFC2068 says that in case of the 300 (multiple choices)
1309 response, the server can output a preferred URL through
1310 `Location' header; otherwise, the request should be treated
1311 like GET. So, if the location is set, it will be a
1312 redirection; otherwise, just proceed normally. */
1313 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1317 logprintf (LOG_VERBOSE,
1318 _("Location: %s%s\n"),
1319 hs->newloc ? hs->newloc : _("unspecified"),
1320 hs->newloc ? _(" [following]") : "");
1321 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1322 might be more bytes in the body. */
1324 FREE_MAYBE (all_headers);
1329 /* If content-type is not given, assume text/html. This is because
1330 of the multitude of broken CGI's that "forget" to generate the
1332 if (!type || 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
1337 if (opt.html_extension && (*dt & TEXTHTML))
1338 /* -E / --html-extension / html_extension = on was specified, and this is a
1339 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1340 already the file's suffix, tack on ".html". */
1342 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1344 if (last_period_in_local_filename == NULL ||
1345 !(strcasecmp(last_period_in_local_filename, ".htm") == EQ ||
1346 strcasecmp(last_period_in_local_filename, ".html") == EQ))
1348 size_t local_filename_len = strlen(*hs->local_file);
1350 *hs->local_file = xrealloc(*hs->local_file,
1351 local_filename_len + sizeof(".html"));
1352 strcpy(*hs->local_file + local_filename_len, ".html");
1354 *dt |= ADDED_HTML_EXTENSION;
1358 if (contrange == -1)
1360 /* We did not get a content-range header. This means that the
1361 server did not honor our `Range' request. Normally, this
1362 means we should reset hs->restval and continue normally. */
1364 /* However, if `-c' is used, we need to be a bit more careful:
1366 1. If `-c' is specified and the file already existed when
1367 Wget was started, it would be a bad idea for us to start
1368 downloading it from scratch, effectively truncating it. I
1369 believe this cannot happen unless `-c' was specified.
1371 2. If `-c' is used on a file that is already fully
1372 downloaded, we're requesting bytes after the end of file,
1373 which can result in server not honoring `Range'. If this is
1374 the case, `Content-Length' will be equal to the length of the
1376 if (opt.always_rest)
1378 /* Check for condition #2. */
1379 if (hs->restval > 0 /* restart was requested. */
1380 && contlen != -1 /* we got content-length. */
1381 && hs->restval >= contlen /* file fully downloaded
1385 logputs (LOG_VERBOSE, _("\
1386 \n The file is already fully retrieved; nothing to do.\n\n"));
1387 /* In case the caller inspects. */
1390 /* Mark as successfully retrieved. */
1393 FREE_MAYBE (all_headers);
1394 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1395 might be more bytes in the body. */
1396 return RETRUNNEEDED;
1399 /* Check for condition #1. */
1400 if (hs->no_truncate)
1402 logprintf (LOG_NOTQUIET,
1405 Continued download failed on this file, which conflicts with `-c'.\n\
1406 Refusing to truncate existing file `%s'.\n\n"), *hs->local_file);
1408 FREE_MAYBE (all_headers);
1409 CLOSE_INVALIDATE (sock);
1410 return CONTNOTSUPPORTED;
1418 else if (contrange != hs->restval ||
1419 (H_PARTIAL (statcode) && contrange == -1))
1421 /* This means the whole request was somehow misunderstood by the
1422 server. Bail out. */
1424 FREE_MAYBE (all_headers);
1425 CLOSE_INVALIDATE (sock);
1432 contlen += contrange;
1434 contrange = -1; /* If conent-length was not sent,
1435 content-range will be ignored. */
1437 hs->contlen = contlen;
1441 if ((*dt & RETROKF) && !opt.server_response)
1443 /* No need to print this output if the body won't be
1444 downloaded at all, or if the original server response is
1446 logputs (LOG_VERBOSE, _("Length: "));
1449 logputs (LOG_VERBOSE, legible (contlen));
1450 if (contrange != -1)
1451 logprintf (LOG_VERBOSE, _(" (%s to go)"),
1452 legible (contlen - contrange));
1455 logputs (LOG_VERBOSE,
1456 opt.ignore_length ? _("ignored") : _("unspecified"));
1458 logprintf (LOG_VERBOSE, " [%s]\n", type);
1460 logputs (LOG_VERBOSE, "\n");
1464 type = NULL; /* We don't need it any more. */
1466 /* Return if we have no intention of further downloading. */
1467 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1469 /* In case the caller cares to look... */
1473 FREE_MAYBE (all_headers);
1474 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1475 might be more bytes in the body. */
1476 return RETRFINISHED;
1479 /* Open the local file. */
1482 mkalldirs (*hs->local_file);
1484 rotate_backups (*hs->local_file);
1485 fp = fopen (*hs->local_file, hs->restval ? "ab" : "wb");
1488 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1489 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1490 might be more bytes in the body. */
1491 FREE_MAYBE (all_headers);
1497 extern int global_download_count;
1499 /* To ensure that repeated "from scratch" downloads work for -O
1500 files, we rewind the file pointer, unless restval is
1501 non-zero. (This works only when -O is used on regular files,
1502 but it's still a valuable feature.)
1504 However, this loses when more than one URL is specified on
1505 the command line the second rewinds eradicates the contents
1506 of the first download. Thus we disable the above trick for
1507 all the downloads except the very first one.
1509 #### A possible solution to this would be to remember the
1510 file position in the output document and to seek to that
1511 position, instead of rewinding. */
1512 if (!hs->restval && global_download_count == 0)
1514 /* This will silently fail for streams that don't correspond
1515 to regular files, but that's OK. */
1517 /* ftruncate is needed because opt.dfp is opened in append
1518 mode if opt.always_rest is set. */
1519 ftruncate (fileno (fp), 0);
1524 /* #### This confuses the code that checks for file size. There
1525 should be some overhead information. */
1526 if (opt.save_headers)
1527 fwrite (all_headers, 1, all_length, fp);
1529 /* Get the contents of the document. */
1530 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
1531 (contlen != -1 ? contlen : 0),
1532 &rbuf, keep_alive, &hs->dltime);
1535 CLOSE_FINISH (sock);
1537 CLOSE_INVALIDATE (sock);
1540 /* Close or flush the file. We have to be careful to check for
1541 error here. Checking the result of fwrite() is not enough --
1542 errors could go unnoticed! */
1545 flush_res = fclose (fp);
1547 flush_res = fflush (fp);
1548 if (flush_res == EOF)
1551 FREE_MAYBE (all_headers);
1554 return RETRFINISHED;
1557 /* The genuine HTTP loop! This is the part where the retrieval is
1558 retried, and retried, and retried, and... */
1560 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1561 int *dt, struct url *proxy)
1564 int use_ts, got_head = 0; /* time-stamping info */
1565 char *filename_plus_orig_suffix;
1566 char *local_filename = NULL;
1567 char *tms, *locf, *tmrate;
1569 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1570 long local_size = 0; /* the size of the local file */
1571 size_t filename_len;
1572 struct http_stat hstat; /* HTTP status */
1576 /* This used to be done in main(), but it's a better idea to do it
1577 here so that we don't go through the hoops if we're just using
1581 if (!wget_cookie_jar)
1582 wget_cookie_jar = cookie_jar_new ();
1583 if (opt.cookies_input && !cookies_loaded_p)
1585 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
1586 cookies_loaded_p = 1;
1592 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1593 has_wildcards_p because it would also warn on `?', and we know that
1594 shows up in CGI paths a *lot*. */
1595 if (strchr (u->url, '*'))
1596 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1598 /* Determine the local filename. */
1599 if (local_file && *local_file)
1600 hstat.local_file = local_file;
1601 else if (local_file)
1603 *local_file = url_filename (u);
1604 hstat.local_file = local_file;
1608 dummy = url_filename (u);
1609 hstat.local_file = &dummy;
1612 if (!opt.output_document)
1613 locf = *hstat.local_file;
1615 locf = opt.output_document;
1617 hstat.referer = referer;
1619 filename_len = strlen (*hstat.local_file);
1620 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1622 if (opt.noclobber && file_exists_p (*hstat.local_file))
1624 /* If opt.noclobber is turned on and file already exists, do not
1625 retrieve the file */
1626 logprintf (LOG_VERBOSE, _("\
1627 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
1628 /* If the file is there, we suppose it's retrieved OK. */
1631 /* #### Bogusness alert. */
1632 /* If its suffix is "html" or "htm" or similar, assume text/html. */
1633 if (has_html_suffix_p (*hstat.local_file))
1641 if (opt.timestamping)
1643 boolean local_dot_orig_file_exists = FALSE;
1645 if (opt.backup_converted)
1646 /* If -K is specified, we'll act on the assumption that it was specified
1647 last time these files were downloaded as well, and instead of just
1648 comparing local file X against server file X, we'll compare local
1649 file X.orig (if extant, else X) against server file X. If -K
1650 _wasn't_ specified last time, or the server contains files called
1651 *.orig, -N will be back to not operating correctly with -k. */
1653 /* Would a single s[n]printf() call be faster? --dan
1655 Definitely not. sprintf() is horribly slow. It's a
1656 different question whether the difference between the two
1657 affects a program. Usually I'd say "no", but at one
1658 point I profiled Wget, and found that a measurable and
1659 non-negligible amount of time was lost calling sprintf()
1660 in url.c. Replacing sprintf with inline calls to
1661 strcpy() and long_to_string() made a difference.
1663 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
1664 memcpy (filename_plus_orig_suffix + filename_len,
1665 ".orig", sizeof (".orig"));
1667 /* Try to stat() the .orig file. */
1668 if (stat (filename_plus_orig_suffix, &st) == 0)
1670 local_dot_orig_file_exists = TRUE;
1671 local_filename = filename_plus_orig_suffix;
1675 if (!local_dot_orig_file_exists)
1676 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1677 if (stat (*hstat.local_file, &st) == 0)
1678 local_filename = *hstat.local_file;
1680 if (local_filename != NULL)
1681 /* There was a local file, so we'll check later to see if the version
1682 the server has is the same version we already have, allowing us to
1688 /* Modification time granularity is 2 seconds for Windows, so
1689 increase local time by 1 second for later comparison. */
1692 local_size = st.st_size;
1696 /* Reset the counter. */
1698 *dt = 0 | ACCEPTRANGES;
1702 /* Increment the pass counter. */
1704 sleep_between_retrievals (count);
1705 /* Get the current time string. */
1706 tms = time_str (NULL);
1707 /* Print fetch message, if opt.verbose. */
1710 char *hurl = url_string (u, 1);
1714 sprintf (tmp, _("(try:%2d)"), count);
1715 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1716 tms, hurl, tmp, locf);
1718 ws_changetitle (hurl, 1);
1723 /* Default document type is empty. However, if spider mode is
1724 on or time-stamping is employed, HEAD_ONLY commands is
1725 encoded within *dt. */
1726 if (opt.spider || (use_ts && !got_head))
1730 /* Assume no restarting. */
1732 /* Decide whether or not to restart. */
1733 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1734 /* #### this calls access() and then stat(); could be optimized. */
1735 && file_exists_p (locf))
1736 if (stat (locf, &st) == 0 && S_ISREG (st.st_mode))
1737 hstat.restval = st.st_size;
1739 /* In `-c' is used and the file is existing and non-empty,
1740 refuse to truncate it if the server doesn't support continued
1742 hstat.no_truncate = 0;
1743 if (opt.always_rest && hstat.restval)
1744 hstat.no_truncate = 1;
1746 /* Decide whether to send the no-cache directive. We send it in
1748 a) we're using a proxy, and we're past our first retrieval.
1749 Some proxies are notorious for caching incomplete data, so
1750 we require a fresh get.
1751 b) caching is explicitly inhibited. */
1752 if ((proxy && count > 1) /* a */
1753 || !opt.allow_cache /* b */
1755 *dt |= SEND_NOCACHE;
1757 *dt &= ~SEND_NOCACHE;
1759 /* Try fetching the document, or at least its head. */
1760 err = gethttp (u, &hstat, dt, proxy);
1762 /* It's unfortunate that wget determines the local filename before finding
1763 out the Content-Type of the file. Barring a major restructuring of the
1764 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1765 *hstat.local_file to tack on ".html". */
1766 if (!opt.output_document)
1767 locf = *hstat.local_file;
1769 locf = opt.output_document;
1772 tms = time_str (NULL);
1773 /* Get the new location (with or without the redirection). */
1775 *newloc = xstrdup (hstat.newloc);
1778 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1779 case CONERROR: case READERR: case WRITEFAILED:
1781 /* Non-fatal errors continue executing the loop, which will
1782 bring them to "while" statement at the end, to judge
1783 whether the number of tries was exceeded. */
1784 free_hstat (&hstat);
1785 printwhat (count, opt.ntry);
1788 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1789 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1790 /* Fatal errors just return from the function. */
1791 free_hstat (&hstat);
1795 case FWRITEERR: case FOPENERR:
1796 /* Another fatal error. */
1797 logputs (LOG_VERBOSE, "\n");
1798 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1799 *hstat.local_file, strerror (errno));
1800 free_hstat (&hstat);
1805 /* Another fatal error. */
1806 logputs (LOG_VERBOSE, "\n");
1807 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1808 free_hstat (&hstat);
1813 /* Return the new location to the caller. */
1816 logprintf (LOG_NOTQUIET,
1817 _("ERROR: Redirection (%d) without location.\n"),
1819 free_hstat (&hstat);
1823 free_hstat (&hstat);
1828 /* The file was already fully retrieved. */
1829 free_hstat (&hstat);
1834 /* Deal with you later. */
1837 /* All possibilities should have been exhausted. */
1840 if (!(*dt & RETROKF))
1844 /* #### Ugly ugly ugly! */
1845 char *hurl = url_string (u, 1);
1846 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1849 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1850 tms, hstat.statcode, hstat.error);
1851 logputs (LOG_VERBOSE, "\n");
1852 free_hstat (&hstat);
1857 /* Did we get the time-stamp? */
1860 if (opt.timestamping && !hstat.remote_time)
1862 logputs (LOG_NOTQUIET, _("\
1863 Last-modified header missing -- time-stamps turned off.\n"));
1865 else if (hstat.remote_time)
1867 /* Convert the date-string into struct tm. */
1868 tmr = http_atotm (hstat.remote_time);
1869 if (tmr == (time_t) (-1))
1870 logputs (LOG_VERBOSE, _("\
1871 Last-modified header invalid -- time-stamp ignored.\n"));
1875 /* The time-stamping section. */
1880 use_ts = 0; /* no more time-stamping */
1881 count = 0; /* the retrieve count for HEAD is
1883 if (hstat.remote_time && tmr != (time_t) (-1))
1885 /* Now time-stamping can be used validly. Time-stamping
1886 means that if the sizes of the local and remote file
1887 match, and local file is newer than the remote file,
1888 it will not be retrieved. Otherwise, the normal
1889 download procedure is resumed. */
1891 (hstat.contlen == -1 || local_size == hstat.contlen))
1893 logprintf (LOG_VERBOSE, _("\
1894 Server file no newer than local file `%s' -- not retrieving.\n\n"),
1896 free_hstat (&hstat);
1900 else if (tml >= tmr)
1901 logprintf (LOG_VERBOSE, _("\
1902 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1904 logputs (LOG_VERBOSE,
1905 _("Remote file is newer, retrieving.\n"));
1907 free_hstat (&hstat);
1910 if ((tmr != (time_t) (-1))
1912 && ((hstat.len == hstat.contlen) ||
1913 ((hstat.res == 0) &&
1914 ((hstat.contlen == -1) ||
1915 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1917 /* #### This code repeats in http.c and ftp.c. Move it to a
1919 const char *fl = NULL;
1920 if (opt.output_document)
1922 if (opt.od_known_regular)
1923 fl = opt.output_document;
1926 fl = *hstat.local_file;
1930 /* End of time-stamping section. */
1934 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1939 tmrate = retr_rate (hstat.len - hstat.restval, hstat.dltime, 0);
1941 if (hstat.len == hstat.contlen)
1945 logprintf (LOG_VERBOSE,
1946 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1947 tms, tmrate, locf, hstat.len, hstat.contlen);
1948 logprintf (LOG_NONVERBOSE,
1949 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1950 tms, u->url, hstat.len, hstat.contlen, locf, count);
1953 downloaded_increase (hstat.len);
1955 /* Remember that we downloaded the file for later ".orig" code. */
1956 if (*dt & ADDED_HTML_EXTENSION)
1957 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1959 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1961 free_hstat (&hstat);
1965 else if (hstat.res == 0) /* No read error */
1967 if (hstat.contlen == -1) /* We don't know how much we were supposed
1968 to get, so assume we succeeded. */
1972 logprintf (LOG_VERBOSE,
1973 _("%s (%s) - `%s' saved [%ld]\n\n"),
1974 tms, tmrate, locf, hstat.len);
1975 logprintf (LOG_NONVERBOSE,
1976 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1977 tms, u->url, hstat.len, locf, count);
1980 downloaded_increase (hstat.len);
1982 /* Remember that we downloaded the file for later ".orig" code. */
1983 if (*dt & ADDED_HTML_EXTENSION)
1984 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
1986 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
1988 free_hstat (&hstat);
1992 else if (hstat.len < hstat.contlen) /* meaning we lost the
1993 connection too soon */
1995 logprintf (LOG_VERBOSE,
1996 _("%s (%s) - Connection closed at byte %ld. "),
1997 tms, tmrate, hstat.len);
1998 printwhat (count, opt.ntry);
1999 free_hstat (&hstat);
2002 else if (!opt.kill_longer) /* meaning we got more than expected */
2004 logprintf (LOG_VERBOSE,
2005 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
2006 tms, tmrate, locf, hstat.len, hstat.contlen);
2007 logprintf (LOG_NONVERBOSE,
2008 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
2009 tms, u->url, hstat.len, hstat.contlen, locf, count);
2011 downloaded_increase (hstat.len);
2013 /* Remember that we downloaded the file for later ".orig" code. */
2014 if (*dt & ADDED_HTML_EXTENSION)
2015 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2017 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2019 free_hstat (&hstat);
2023 else /* the same, but not accepted */
2025 logprintf (LOG_VERBOSE,
2026 _("%s (%s) - Connection closed at byte %ld/%ld. "),
2027 tms, tmrate, hstat.len, hstat.contlen);
2028 printwhat (count, opt.ntry);
2029 free_hstat (&hstat);
2033 else /* now hstat.res can only be -1 */
2035 if (hstat.contlen == -1)
2037 logprintf (LOG_VERBOSE,
2038 _("%s (%s) - Read error at byte %ld (%s)."),
2039 tms, tmrate, hstat.len, strerror (errno));
2040 printwhat (count, opt.ntry);
2041 free_hstat (&hstat);
2044 else /* hstat.res == -1 and contlen is given */
2046 logprintf (LOG_VERBOSE,
2047 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
2048 tms, tmrate, hstat.len, hstat.contlen,
2050 printwhat (count, opt.ntry);
2051 free_hstat (&hstat);
2058 while (!opt.ntry || (count < opt.ntry));
2062 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
2063 than local timezone.
2065 mktime is similar but assumes struct tm, also known as the
2066 "broken-down" form of time, is in local time zone. mktime_from_utc
2067 uses mktime to make the conversion understanding that an offset
2068 will be introduced by the local time assumption.
2070 mktime_from_utc then measures the introduced offset by applying
2071 gmtime to the initial result and applying mktime to the resulting
2072 "broken-down" form. The difference between the two mktime results
2073 is the measured offset which is then subtracted from the initial
2074 mktime result to yield a calendar time which is the value returned.
2076 tm_isdst in struct tm is set to 0 to force mktime to introduce a
2077 consistent offset (the non DST offset) since tm and tm+o might be
2078 on opposite sides of a DST change.
2080 Some implementations of mktime return -1 for the nonexistent
2081 localtime hour at the beginning of DST. In this event, use
2082 mktime(tm - 1hr) + 3600.
2086 gmtime(t+o) --> tm+o
2087 mktime(tm+o) --> t+2o
2088 t+o - (t+2o - t+o) = t
2090 Note that glibc contains a function of the same purpose named
2091 `timegm' (reverse of gmtime). But obviously, it is not universally
2092 available, and unfortunately it is not straightforwardly
2093 extractable for use here. Perhaps configure should detect timegm
2094 and use it where available.
2096 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
2097 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
2098 Further improved by Roger with assistance from Edward J. Sabol
2099 based on input by Jamie Zawinski. */
2102 mktime_from_utc (struct tm *t)
2113 return -1; /* can't deal with output from strptime */
2124 return -1; /* can't deal with output from gmtime */
2127 return (tl - (tb - tl));
2130 /* Check whether the result of strptime() indicates success.
2131 strptime() returns the pointer to how far it got to in the string.
2132 The processing has been successful if the string is at `GMT' or
2133 `+X', or at the end of the string.
2135 In extended regexp parlance, the function returns 1 if P matches
2136 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2137 can return) is considered a failure and 0 is returned. */
2139 check_end (const char *p)
2143 while (ISSPACE (*p))
2146 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2147 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
2153 /* Convert the textual specification of time in TIME_STRING to the
2154 number of seconds since the Epoch.
2156 TIME_STRING can be in any of the three formats RFC2068 allows the
2157 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
2158 Timezones are ignored, and should be GMT.
2160 Return the computed time_t representation, or -1 if the conversion
2163 This function uses strptime with various string formats for parsing
2164 TIME_STRING. This results in a parser that is not as lenient in
2165 interpreting TIME_STRING as I would like it to be. Being based on
2166 strptime, it always allows shortened months, one-digit days, etc.,
2167 but due to the multitude of formats in which time can be
2168 represented, an ideal HTTP time parser would be even more
2169 forgiving. It should completely ignore things like week days and
2170 concentrate only on the various forms of representing years,
2171 months, days, hours, minutes, and seconds. For example, it would
2172 be nice if it accepted ISO 8601 out of the box.
2174 I've investigated free and PD code for this purpose, but none was
2175 usable. getdate was big and unwieldy, and had potential copyright
2176 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2177 distributed with phttpd, is excellent, but we cannot use it because
2178 it is not assigned to the FSF. So I stuck it with strptime. */
2181 http_atotm (const char *time_string)
2183 /* NOTE: Solaris strptime man page claims that %n and %t match white
2184 space, but that's not universally available. Instead, we simply
2185 use ` ' to mean "skip all WS", which works under all strptime
2186 implementations I've tested. */
2188 static const char *time_formats[] = {
2189 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
2190 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
2191 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
2192 (google.com uses this for their cookies.) */
2193 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2199 /* According to Roger Beeman, we need to initialize tm_isdst, since
2200 strptime won't do it. */
2203 /* Note that under foreign locales Solaris strptime() fails to
2204 recognize English dates, which renders this function useless. We
2205 solve this by being careful not to affect LC_TIME when
2206 initializing locale.
2208 Another solution would be to temporarily set locale to C, invoke
2209 strptime(), and restore it back. This is slow and dirty,
2210 however, and locale support other than LC_MESSAGES can mess other
2211 things, so I rather chose to stick with just setting LC_MESSAGES.
2213 GNU strptime does not have this problem because it recognizes
2214 both international and local dates. */
2216 for (i = 0; i < ARRAY_SIZE (time_formats); i++)
2217 if (check_end (strptime (time_string, time_formats[i], &t)))
2218 return mktime_from_utc (&t);
2220 /* All formats have failed. */
2224 /* Authorization support: We support two authorization schemes:
2226 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2228 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2229 consisting of answering to the server's challenge with the proper
2232 /* How many bytes it will take to store LEN bytes in base64. */
2233 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2235 /* Encode the string S of length LENGTH to base64 format and place it
2236 to STORE. STORE will be 0-terminated, and must point to a writable
2237 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2239 base64_encode (const char *s, char *store, int length)
2241 /* Conversion table. */
2242 static char tbl[64] = {
2243 'A','B','C','D','E','F','G','H',
2244 'I','J','K','L','M','N','O','P',
2245 'Q','R','S','T','U','V','W','X',
2246 'Y','Z','a','b','c','d','e','f',
2247 'g','h','i','j','k','l','m','n',
2248 'o','p','q','r','s','t','u','v',
2249 'w','x','y','z','0','1','2','3',
2250 '4','5','6','7','8','9','+','/'
2253 unsigned char *p = (unsigned char *)store;
2255 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2256 for (i = 0; i < length; i += 3)
2258 *p++ = tbl[s[0] >> 2];
2259 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2260 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2261 *p++ = tbl[s[2] & 0x3f];
2264 /* Pad the result if necessary... */
2265 if (i == length + 1)
2267 else if (i == length + 2)
2268 *(p - 1) = *(p - 2) = '=';
2269 /* ...and zero-terminate it. */
2273 /* Create the authentication header contents for the `Basic' scheme.
2274 This is done by encoding the string `USER:PASS' in base64 and
2275 prepending `HEADER: Basic ' to it. */
2277 basic_authentication_encode (const char *user, const char *passwd,
2280 char *t1, *t2, *res;
2281 int len1 = strlen (user) + 1 + strlen (passwd);
2282 int len2 = BASE64_LENGTH (len1);
2284 t1 = (char *)alloca (len1 + 1);
2285 sprintf (t1, "%s:%s", user, passwd);
2286 t2 = (char *)alloca (1 + len2);
2287 base64_encode (t1, t2, len1);
2288 res = (char *)xmalloc (len2 + 11 + strlen (header));
2289 sprintf (res, "%s: Basic %s\r\n", header, t2);
2295 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2296 of a field in such a header. If the field is the one specified by
2297 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2298 digest authorization code), extract its value in the (char*)
2299 variable pointed by RET. Returns negative on a malformed header,
2300 or number of bytes that have been parsed by this call. */
2302 extract_header_attr (const char *au, const char *attr_name, char **ret)
2304 const char *cp, *ep;
2308 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2310 cp += strlen (attr_name);
2313 cp += skip_lws (cp);
2318 cp += skip_lws (cp);
2323 for (ep = cp; *ep && *ep != '\"'; ep++)
2328 *ret = strdupdelim (cp, ep);
2335 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2336 an array of 16 bytes containing the hash keys, and BUF should be a
2337 buffer of 33 writable characters (32 for hex digits plus one for
2338 zero termination). */
2340 dump_hash (unsigned char *buf, const unsigned char *hash)
2344 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2346 *buf++ = XDIGIT_TO_xchar (*hash >> 4);
2347 *buf++ = XDIGIT_TO_xchar (*hash & 0xf);
2352 /* Take the line apart to find the challenge, and compose a digest
2353 authorization header. See RFC2069 section 2.1.2. */
2355 digest_authentication_encode (const char *au, const char *user,
2356 const char *passwd, const char *method,
2359 static char *realm, *opaque, *nonce;
2364 { "realm", &realm },
2365 { "opaque", &opaque },
2370 realm = opaque = nonce = NULL;
2372 au += 6; /* skip over `Digest' */
2377 au += skip_lws (au);
2378 for (i = 0; i < ARRAY_SIZE (options); i++)
2380 int skip = extract_header_attr (au, options[i].name,
2381 options[i].variable);
2385 FREE_MAYBE (opaque);
2395 if (i == ARRAY_SIZE (options))
2397 while (*au && *au != '=')
2401 au += skip_lws (au);
2405 while (*au && *au != '\"')
2412 while (*au && *au != ',')
2417 if (!realm || !nonce || !user || !passwd || !path || !method)
2420 FREE_MAYBE (opaque);
2425 /* Calculate the digest value. */
2427 ALLOCA_MD5_CONTEXT (ctx);
2428 unsigned char hash[MD5_HASHLEN];
2429 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2430 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2432 /* A1BUF = H(user ":" realm ":" password) */
2434 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2435 gen_md5_update ((unsigned char *)":", 1, ctx);
2436 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2437 gen_md5_update ((unsigned char *)":", 1, ctx);
2438 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2439 gen_md5_finish (ctx, hash);
2440 dump_hash (a1buf, hash);
2442 /* A2BUF = H(method ":" path) */
2444 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2445 gen_md5_update ((unsigned char *)":", 1, ctx);
2446 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2447 gen_md5_finish (ctx, hash);
2448 dump_hash (a2buf, hash);
2450 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2452 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2453 gen_md5_update ((unsigned char *)":", 1, ctx);
2454 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2455 gen_md5_update ((unsigned char *)":", 1, ctx);
2456 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2457 gen_md5_finish (ctx, hash);
2458 dump_hash (response_digest, hash);
2460 res = (char*) xmalloc (strlen (user)
2465 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2466 + (opaque ? strlen (opaque) : 0)
2468 sprintf (res, "Authorization: Digest \
2469 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2470 user, realm, nonce, path, response_digest);
2473 char *p = res + strlen (res);
2474 strcat (p, ", opaque=\"");
2478 strcat (res, "\r\n");
2482 #endif /* USE_DIGEST */
2485 #define BEGINS_WITH(line, string_constant) \
2486 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2487 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2488 || !line[sizeof (string_constant) - 1]))
2491 known_authentication_scheme_p (const char *au)
2493 return BEGINS_WITH (au, "Basic")
2494 || BEGINS_WITH (au, "Digest")
2495 || BEGINS_WITH (au, "NTLM");
2500 /* Create the HTTP authorization request header. When the
2501 `WWW-Authenticate' response header is seen, according to the
2502 authorization scheme specified in that header (`Basic' and `Digest'
2503 are supported by the current implementation), produce an
2504 appropriate HTTP authorization request header. */
2506 create_authorization_line (const char *au, const char *user,
2507 const char *passwd, const char *method,
2510 char *wwwauth = NULL;
2512 if (!strncasecmp (au, "Basic", 5))
2513 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2514 if (!strncasecmp (au, "NTLM", 4))
2515 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
2517 else if (!strncasecmp (au, "Digest", 6))
2518 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
2519 #endif /* USE_DIGEST */
2526 if (pc_last_host_ip)
2527 address_list_release (pc_last_host_ip);