2 Copyright (C) 2005 Free Software Foundation, Inc.
4 This file is part of GNU Wget.
6 GNU Wget is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 GNU Wget is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with Wget; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 In addition, as a special exception, the Free Software Foundation
21 gives permission to link the code of its release of Wget with the
22 OpenSSL project's "OpenSSL" library (or with modified versions of it
23 that use the same license as the "OpenSSL" library), and distribute
24 the linked executables. You must obey the GNU General Public License
25 in all respects for all of the code used other than "OpenSSL". If you
26 modify this file, you may extend this exception to your version of the
27 file, but you are not obligated to do so. If you do not wish to do
28 so, delete this exception statement from your version. */
34 #include <sys/types.h>
45 #if TIME_WITH_SYS_TIME
46 # include <sys/time.h>
50 # include <sys/time.h>
70 # include "http-ntlm.h"
78 extern char *version_string;
79 extern LARGE_INT total_downloaded_bytes;
81 extern FILE *output_stream;
82 extern int output_stream_regular;
85 # define MIN(x, y) ((x) > (y) ? (y) : (x))
89 static int cookies_loaded_p;
90 static struct cookie_jar *wget_cookie_jar;
92 #define TEXTHTML_S "text/html"
93 #define TEXTXHTML_S "application/xhtml+xml"
95 /* Some status code validation macros: */
96 #define H_20X(x) (((x) >= 200) && ((x) < 300))
97 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
98 #define H_REDIRECTED(x) ((x) == HTTP_STATUS_MOVED_PERMANENTLY \
99 || (x) == HTTP_STATUS_MOVED_TEMPORARILY \
100 || (x) == HTTP_STATUS_SEE_OTHER \
101 || (x) == HTTP_STATUS_TEMPORARY_REDIRECT)
103 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
104 /* Successful 2xx. */
105 #define HTTP_STATUS_OK 200
106 #define HTTP_STATUS_CREATED 201
107 #define HTTP_STATUS_ACCEPTED 202
108 #define HTTP_STATUS_NO_CONTENT 204
109 #define HTTP_STATUS_PARTIAL_CONTENTS 206
111 /* Redirection 3xx. */
112 #define HTTP_STATUS_MULTIPLE_CHOICES 300
113 #define HTTP_STATUS_MOVED_PERMANENTLY 301
114 #define HTTP_STATUS_MOVED_TEMPORARILY 302
115 #define HTTP_STATUS_SEE_OTHER 303 /* from HTTP/1.1 */
116 #define HTTP_STATUS_NOT_MODIFIED 304
117 #define HTTP_STATUS_TEMPORARY_REDIRECT 307 /* from HTTP/1.1 */
119 /* Client error 4xx. */
120 #define HTTP_STATUS_BAD_REQUEST 400
121 #define HTTP_STATUS_UNAUTHORIZED 401
122 #define HTTP_STATUS_FORBIDDEN 403
123 #define HTTP_STATUS_NOT_FOUND 404
124 #define HTTP_STATUS_RANGE_NOT_SATISFIABLE 416
126 /* Server errors 5xx. */
127 #define HTTP_STATUS_INTERNAL 500
128 #define HTTP_STATUS_NOT_IMPLEMENTED 501
129 #define HTTP_STATUS_BAD_GATEWAY 502
130 #define HTTP_STATUS_UNAVAILABLE 503
133 rel_none, rel_name, rel_value, rel_both
140 struct request_header {
142 enum rp release_policy;
144 int hcount, hcapacity;
147 /* Create a new, empty request. At least request_set_method must be
148 called before the request can be used. */
150 static struct request *
153 struct request *req = xnew0 (struct request);
155 req->headers = xnew_array (struct request_header, req->hcapacity);
159 /* Set the request's method and its arguments. METH should be a
160 literal string (or it should outlive the request) because it will
161 not be freed. ARG will be freed by request_free. */
164 request_set_method (struct request *req, const char *meth, char *arg)
170 /* Return the method string passed with the last call to
171 request_set_method. */
174 request_method (const struct request *req)
179 /* Free one header according to the release policy specified with
180 request_set_header. */
183 release_header (struct request_header *hdr)
185 switch (hdr->release_policy)
202 /* Set the request named NAME to VALUE. Specifically, this means that
203 a "NAME: VALUE\r\n" header line will be used in the request. If a
204 header with the same name previously existed in the request, its
205 value will be replaced by this one. A NULL value means do nothing.
207 RELEASE_POLICY determines whether NAME and VALUE should be released
208 (freed) with request_free. Allowed values are:
210 - rel_none - don't free NAME or VALUE
211 - rel_name - free NAME when done
212 - rel_value - free VALUE when done
213 - rel_both - free both NAME and VALUE when done
215 Setting release policy is useful when arguments come from different
216 sources. For example:
218 // Don't free literal strings!
219 request_set_header (req, "Pragma", "no-cache", rel_none);
221 // Don't free a global variable, we'll need it later.
222 request_set_header (req, "Referer", opt.referer, rel_none);
224 // Value freshly allocated, free it when done.
225 request_set_header (req, "Range",
226 aprintf ("bytes=%s-", number_to_static_string (hs->restval)),
231 request_set_header (struct request *req, char *name, char *value,
232 enum rp release_policy)
234 struct request_header *hdr;
239 /* A NULL value is a no-op; if freeing the name is requested,
240 free it now to avoid leaks. */
241 if (release_policy == rel_name || release_policy == rel_both)
246 for (i = 0; i < req->hcount; i++)
248 hdr = &req->headers[i];
249 if (0 == strcasecmp (name, hdr->name))
251 /* Replace existing header. */
252 release_header (hdr);
255 hdr->release_policy = release_policy;
260 /* Install new header. */
262 if (req->hcount >= req->hcapacity)
264 req->hcapacity <<= 1;
265 req->headers = xrealloc (req->headers, req->hcapacity * sizeof (*hdr));
267 hdr = &req->headers[req->hcount++];
270 hdr->release_policy = release_policy;
273 /* Like request_set_header, but sets the whole header line, as
274 provided by the user using the `--header' option. For example,
275 request_set_user_header (req, "Foo: bar") works just like
276 request_set_header (req, "Foo", "bar"). */
279 request_set_user_header (struct request *req, const char *header)
282 const char *p = strchr (header, ':');
285 BOUNDED_TO_ALLOCA (header, p, name);
289 request_set_header (req, xstrdup (name), (char *) p, rel_name);
292 /* Remove the header with specified name from REQ. Returns 1 if the
293 header was actually removed, 0 otherwise. */
296 request_remove_header (struct request *req, char *name)
299 for (i = 0; i < req->hcount; i++)
301 struct request_header *hdr = &req->headers[i];
302 if (0 == strcasecmp (name, hdr->name))
304 release_header (hdr);
305 /* Move the remaining headers by one. */
306 if (i < req->hcount - 1)
307 memmove (hdr, hdr + 1, (req->hcount - i - 1) * sizeof (*hdr));
315 #define APPEND(p, str) do { \
316 int A_len = strlen (str); \
317 memcpy (p, str, A_len); \
321 /* Construct the request and write it to FD using fd_write. */
324 request_send (const struct request *req, int fd)
326 char *request_string, *p;
327 int i, size, write_error;
329 /* Count the request size. */
332 /* METHOD " " ARG " " "HTTP/1.0" "\r\n" */
333 size += strlen (req->method) + 1 + strlen (req->arg) + 1 + 8 + 2;
335 for (i = 0; i < req->hcount; i++)
337 struct request_header *hdr = &req->headers[i];
338 /* NAME ": " VALUE "\r\n" */
339 size += strlen (hdr->name) + 2 + strlen (hdr->value) + 2;
345 p = request_string = alloca_array (char, size);
347 /* Generate the request. */
349 APPEND (p, req->method); *p++ = ' ';
350 APPEND (p, req->arg); *p++ = ' ';
351 memcpy (p, "HTTP/1.0\r\n", 10); p += 10;
353 for (i = 0; i < req->hcount; i++)
355 struct request_header *hdr = &req->headers[i];
356 APPEND (p, hdr->name);
357 *p++ = ':', *p++ = ' ';
358 APPEND (p, hdr->value);
359 *p++ = '\r', *p++ = '\n';
362 *p++ = '\r', *p++ = '\n', *p++ = '\0';
363 assert (p - request_string == size);
367 DEBUGP (("\n---request begin---\n%s---request end---\n", request_string));
369 /* Send the request to the server. */
371 write_error = fd_write (fd, request_string, size - 1, -1.0);
373 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
378 /* Release the resources used by REQ. */
381 request_free (struct request *req)
384 xfree_null (req->arg);
385 for (i = 0; i < req->hcount; i++)
386 release_header (&req->headers[i]);
387 xfree_null (req->headers);
391 /* Send the contents of FILE_NAME to SOCK. Make sure that exactly
392 PROMISED_SIZE bytes are sent over the wire -- if the file is
393 longer, read only that much; if the file is shorter, report an error. */
396 post_file (int sock, const char *file_name, wgint promised_size)
398 static char chunk[8192];
403 DEBUGP (("[writing POST file %s ... ", file_name));
405 fp = fopen (file_name, "rb");
408 while (!feof (fp) && written < promised_size)
411 int length = fread (chunk, 1, sizeof (chunk), fp);
414 towrite = MIN (promised_size - written, length);
415 write_error = fd_write (sock, chunk, towrite, -1.0);
425 /* If we've written less than was promised, report a (probably
426 nonsensical) error rather than break the promise. */
427 if (written < promised_size)
433 assert (written == promised_size);
434 DEBUGP (("done]\n"));
439 response_head_terminator (const char *hunk, int oldlen, int peeklen)
441 const char *start, *end;
443 /* If at first peek, verify whether HUNK starts with "HTTP". If
444 not, this is a HTTP/0.9 request and we must bail out without
446 if (oldlen == 0 && 0 != memcmp (hunk, "HTTP", MIN (peeklen, 4)))
452 start = hunk + oldlen - 4;
453 end = hunk + oldlen + peeklen;
455 for (; start < end - 1; start++)
462 if (start[1] == '\n')
468 /* The maximum size of a single HTTP response we care to read. This
469 is not meant to impose an arbitrary limit, but to protect the user
470 from Wget slurping up available memory upon encountering malicious
471 or buggy server output. Define it to 0 to remove the limit. */
473 #define HTTP_RESPONSE_MAX_SIZE 65536
475 /* Read the HTTP request head from FD and return it. The error
476 conditions are the same as with fd_read_hunk.
478 To support HTTP/0.9 responses, this function tries to make sure
479 that the data begins with "HTTP". If this is not the case, no data
480 is read and an empty request is returned, so that the remaining
481 data can be treated as body. */
484 read_http_response_head (int fd)
486 return fd_read_hunk (fd, response_head_terminator, 512,
487 HTTP_RESPONSE_MAX_SIZE);
491 /* The response data. */
494 /* The array of pointers that indicate where each header starts.
495 For example, given this HTTP response:
502 The headers are located like this:
504 "HTTP/1.0 200 Ok\r\nDescription: some\r\n text\r\nEtag: x\r\n\r\n"
506 headers[0] headers[1] headers[2] headers[3]
508 I.e. headers[0] points to the beginning of the request,
509 headers[1] points to the end of the first header and the
510 beginning of the second one, etc. */
512 const char **headers;
515 /* Create a new response object from the text of the HTTP response,
516 available in HEAD. That text is automatically split into
517 constituent header lines for fast retrieval using
520 static struct response *
521 resp_new (const char *head)
526 struct response *resp = xnew0 (struct response);
531 /* Empty head means that we're dealing with a headerless
532 (HTTP/0.9) response. In that case, don't set HEADERS at
537 /* Split HEAD into header lines, so that resp_header_* functions
538 don't need to do this over and over again. */
544 DO_REALLOC (resp->headers, size, count + 1, const char *);
545 resp->headers[count++] = hdr;
547 /* Break upon encountering an empty line. */
548 if (!hdr[0] || (hdr[0] == '\r' && hdr[1] == '\n') || hdr[0] == '\n')
551 /* Find the end of HDR, including continuations. */
554 const char *end = strchr (hdr, '\n');
560 while (*hdr == ' ' || *hdr == '\t');
562 DO_REALLOC (resp->headers, size, count + 1, const char *);
563 resp->headers[count] = NULL;
568 /* Locate the header named NAME in the request data, starting with
569 position START. This allows the code to loop through the request
570 data, filtering for all requests of a given name. Returns the
571 found position, or -1 for failure. The code that uses this
572 function typically looks like this:
574 for (pos = 0; (pos = resp_header_locate (...)) != -1; pos++)
575 ... do something with header ...
577 If you only care about one header, use resp_header_get instead of
581 resp_header_locate (const struct response *resp, const char *name, int start,
582 const char **begptr, const char **endptr)
585 const char **headers = resp->headers;
588 if (!headers || !headers[1])
591 name_len = strlen (name);
597 for (; headers[i + 1]; i++)
599 const char *b = headers[i];
600 const char *e = headers[i + 1];
602 && b[name_len] == ':'
603 && 0 == strncasecmp (b, name, name_len))
606 while (b < e && ISSPACE (*b))
608 while (b < e && ISSPACE (e[-1]))
618 /* Find and retrieve the header named NAME in the request data. If
619 found, set *BEGPTR to its starting, and *ENDPTR to its ending
620 position, and return 1. Otherwise return 0.
622 This function is used as a building block for resp_header_copy
623 and resp_header_strdup. */
626 resp_header_get (const struct response *resp, const char *name,
627 const char **begptr, const char **endptr)
629 int pos = resp_header_locate (resp, name, 0, begptr, endptr);
633 /* Copy the response header named NAME to buffer BUF, no longer than
634 BUFSIZE (BUFSIZE includes the terminating 0). If the header
635 exists, 1 is returned, otherwise 0. If there should be no limit on
636 the size of the header, use resp_header_strdup instead.
638 If BUFSIZE is 0, no data is copied, but the boolean indication of
639 whether the header is present is still returned. */
642 resp_header_copy (const struct response *resp, const char *name,
643 char *buf, int bufsize)
646 if (!resp_header_get (resp, name, &b, &e))
650 int len = MIN (e - b, bufsize - 1);
651 memcpy (buf, b, len);
657 /* Return the value of header named NAME in RESP, allocated with
658 malloc. If such a header does not exist in RESP, return NULL. */
661 resp_header_strdup (const struct response *resp, const char *name)
664 if (!resp_header_get (resp, name, &b, &e))
666 return strdupdelim (b, e);
669 /* Parse the HTTP status line, which is of format:
671 HTTP-Version SP Status-Code SP Reason-Phrase
673 The function returns the status-code, or -1 if the status line
674 appears malformed. The pointer to "reason-phrase" message is
675 returned in *MESSAGE. */
678 resp_status (const struct response *resp, char **message)
685 /* For a HTTP/0.9 response, assume status 200. */
687 *message = xstrdup (_("No headers, assuming HTTP/0.9"));
691 p = resp->headers[0];
692 end = resp->headers[1];
698 if (end - p < 4 || 0 != strncmp (p, "HTTP", 4))
702 /* Match the HTTP version. This is optional because Gnutella
703 servers have been reported to not specify HTTP version. */
704 if (p < end && *p == '/')
707 while (p < end && ISDIGIT (*p))
709 if (p < end && *p == '.')
711 while (p < end && ISDIGIT (*p))
715 while (p < end && ISSPACE (*p))
717 if (end - p < 3 || !ISDIGIT (p[0]) || !ISDIGIT (p[1]) || !ISDIGIT (p[2]))
720 status = 100 * (p[0] - '0') + 10 * (p[1] - '0') + (p[2] - '0');
725 while (p < end && ISSPACE (*p))
727 while (p < end && ISSPACE (end[-1]))
729 *message = strdupdelim (p, end);
735 /* Release the resources used by RESP. */
738 resp_free (struct response *resp)
740 xfree_null (resp->headers);
744 /* Print the server response, line by line, omitting the trailing CRLF
745 from individual header lines, and prefixed with PREFIX. */
748 print_server_response (const struct response *resp, const char *prefix)
753 for (i = 0; resp->headers[i + 1]; i++)
755 const char *b = resp->headers[i];
756 const char *e = resp->headers[i + 1];
758 if (b < e && e[-1] == '\n')
760 if (b < e && e[-1] == '\r')
762 /* This is safe even on printfs with broken handling of "%.<n>s"
763 because resp->headers ends with \0. */
764 logprintf (LOG_VERBOSE, "%s%.*s\n", prefix, e - b, b);
768 /* Parse the `Content-Range' header and extract the information it
769 contains. Returns 1 if successful, -1 otherwise. */
771 parse_content_range (const char *hdr, wgint *first_byte_ptr,
772 wgint *last_byte_ptr, wgint *entity_length_ptr)
776 /* Ancient versions of Netscape proxy server, presumably predating
777 rfc2068, sent out `Content-Range' without the "bytes"
779 if (!strncasecmp (hdr, "bytes", 5))
782 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
786 while (ISSPACE (*hdr))
793 for (num = 0; ISDIGIT (*hdr); hdr++)
794 num = 10 * num + (*hdr - '0');
795 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
797 *first_byte_ptr = num;
799 for (num = 0; ISDIGIT (*hdr); hdr++)
800 num = 10 * num + (*hdr - '0');
801 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
803 *last_byte_ptr = num;
805 for (num = 0; ISDIGIT (*hdr); hdr++)
806 num = 10 * num + (*hdr - '0');
807 *entity_length_ptr = num;
811 /* Read the body of the request, but don't store it anywhere and don't
812 display a progress gauge. This is useful for reading the bodies of
813 administrative responses to which we will soon issue another
814 request. The response is not useful to the user, but reading it
815 allows us to continue using the same connection to the server.
817 If reading fails, 0 is returned, non-zero otherwise. In debug
818 mode, the body is displayed for debugging purposes. */
821 skip_short_body (int fd, wgint contlen)
824 SKIP_SIZE = 512, /* size of the download buffer */
825 SKIP_THRESHOLD = 4096 /* the largest size we read */
827 char dlbuf[SKIP_SIZE + 1];
828 dlbuf[SKIP_SIZE] = '\0'; /* so DEBUGP can safely print it */
830 /* We shouldn't get here with unknown contlen. (This will change
831 with HTTP/1.1, which supports "chunked" transfer.) */
832 assert (contlen != -1);
834 /* If the body is too large, it makes more sense to simply close the
835 connection than to try to read the body. */
836 if (contlen > SKIP_THRESHOLD)
839 DEBUGP (("Skipping %s bytes of body: [", number_to_static_string (contlen)));
843 int ret = fd_read (fd, dlbuf, MIN (contlen, SKIP_SIZE), -1.0);
846 /* Don't normally report the error since this is an
847 optimization that should be invisible to the user. */
848 DEBUGP (("] aborting (%s).\n",
849 ret < 0 ? strerror (errno) : "EOF received"));
853 /* Safe even if %.*s bogusly expects terminating \0 because
854 we've zero-terminated dlbuf above. */
855 DEBUGP (("%.*s", ret, dlbuf));
858 DEBUGP (("] done.\n"));
862 /* Persistent connections. Currently, we cache the most recently used
863 connection as persistent, provided that the HTTP server agrees to
864 make it such. The persistence data is stored in the variables
865 below. Ideally, it should be possible to cache an arbitrary fixed
866 number of these connections. */
868 /* Whether a persistent connection is active. */
869 static int pconn_active;
872 /* The socket of the connection. */
875 /* Host and port of the currently active persistent connection. */
879 /* Whether a ssl handshake has occoured on this connection. */
882 /* Whether the connection was authorized. This is only done by
883 NTLM, which authorizes *connections* rather than individual
884 requests. (That practice is peculiar for HTTP, but it is a
885 useful optimization.) */
889 /* NTLM data of the current connection. */
890 struct ntlmdata ntlm;
894 /* Mark the persistent connection as invalid and free the resources it
895 uses. This is used by the CLOSE_* macros after they forcefully
896 close a registered persistent connection. */
899 invalidate_persistent (void)
901 DEBUGP (("Disabling further reuse of socket %d.\n", pconn.socket));
903 fd_close (pconn.socket);
908 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
909 persistent. This will enable someone to use the same connection
910 later. In the context of HTTP, this must be called only AFTER the
911 response has been received and the server has promised that the
912 connection will remain alive.
914 If a previous connection was persistent, it is closed. */
917 register_persistent (const char *host, int port, int fd, int ssl)
921 if (pconn.socket == fd)
923 /* The connection FD is already registered. */
928 /* The old persistent connection is still active; close it
929 first. This situation arises whenever a persistent
930 connection exists, but we then connect to a different
931 host, and try to register a persistent connection to that
933 invalidate_persistent ();
939 pconn.host = xstrdup (host);
942 pconn.authorized = 0;
944 DEBUGP (("Registered socket %d for persistent reuse.\n", fd));
947 /* Return non-zero if a persistent connection is available for
948 connecting to HOST:PORT. */
951 persistent_available_p (const char *host, int port, int ssl,
952 int *host_lookup_failed)
954 /* First, check whether a persistent connection is active at all. */
958 /* If we want SSL and the last connection wasn't or vice versa,
959 don't use it. Checking for host and port is not enough because
960 HTTP and HTTPS can apparently coexist on the same port. */
961 if (ssl != pconn.ssl)
964 /* If we're not connecting to the same port, we're not interested. */
965 if (port != pconn.port)
968 /* If the host is the same, we're in business. If not, there is
969 still hope -- read below. */
970 if (0 != strcasecmp (host, pconn.host))
972 /* If pconn.socket is already talking to HOST, we needn't
973 reconnect. This happens often when both sites are virtual
974 hosts distinguished only by name and served by the same
975 network interface, and hence the same web server (possibly
976 set up by the ISP and serving many different web sites).
977 This admittedly non-standard optimization does not contradict
978 HTTP and works well with popular server software. */
982 struct address_list *al;
985 /* Don't try to talk to two different SSL sites over the same
986 secure connection! (Besides, it's not clear if name-based
987 virtual hosting is even possible with SSL.) */
990 /* If pconn.socket's peer is one of the IP addresses HOST
991 resolves to, pconn.socket is for all intents and purposes
992 already talking to HOST. */
994 if (!socket_ip_address (pconn.socket, &ip, ENDPOINT_PEER))
996 /* Can't get the peer's address -- something must be very
997 wrong with the connection. */
998 invalidate_persistent ();
1001 al = lookup_host (host, 0);
1004 *host_lookup_failed = 1;
1008 found = address_list_contains (al, &ip);
1009 address_list_release (al);
1014 /* The persistent connection's peer address was found among the
1015 addresses HOST resolved to; therefore, pconn.sock is in fact
1016 already talking to HOST -- no need to reconnect. */
1019 /* Finally, check whether the connection is still open. This is
1020 important because most server implement a liberal (short) timeout
1021 on persistent connections. Wget can of course always reconnect
1022 if the connection doesn't work out, but it's nicer to know in
1023 advance. This test is a logical followup of the first test, but
1024 is "expensive" and therefore placed at the end of the list. */
1026 if (!test_socket_open (pconn.socket))
1028 /* Oops, the socket is no longer open. Now that we know that,
1029 let's invalidate the persistent connection before returning
1031 invalidate_persistent ();
1038 /* The idea behind these two CLOSE macros is to distinguish between
1039 two cases: one when the job we've been doing is finished, and we
1040 want to close the connection and leave, and two when something is
1041 seriously wrong and we're closing the connection as part of
1044 In case of keep_alive, CLOSE_FINISH should leave the connection
1045 open, while CLOSE_INVALIDATE should still close it.
1047 Note that the semantics of the flag `keep_alive' is "this
1048 connection *will* be reused (the server has promised not to close
1049 the connection once we're done)", while the semantics of
1050 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
1051 active, registered connection". */
1053 #define CLOSE_FINISH(fd) do { \
1056 if (pconn_active && (fd) == pconn.socket) \
1057 invalidate_persistent (); \
1066 #define CLOSE_INVALIDATE(fd) do { \
1067 if (pconn_active && (fd) == pconn.socket) \
1068 invalidate_persistent (); \
1076 wgint len; /* received length */
1077 wgint contlen; /* expected length */
1078 wgint restval; /* the restart value */
1079 int res; /* the result of last read */
1080 char *newloc; /* new location (redirection) */
1081 char *remote_time; /* remote time-stamp string */
1082 char *error; /* textual HTTP error */
1083 int statcode; /* status code */
1084 wgint rd_size; /* amount of data read from socket */
1085 double dltime; /* time it took to download the data */
1086 const char *referer; /* value of the referer header. */
1087 char **local_file; /* local file. */
1091 free_hstat (struct http_stat *hs)
1093 xfree_null (hs->newloc);
1094 xfree_null (hs->remote_time);
1095 xfree_null (hs->error);
1097 /* Guard against being called twice. */
1099 hs->remote_time = NULL;
1103 static char *create_authorization_line PARAMS ((const char *, const char *,
1104 const char *, const char *,
1105 const char *, int *));
1106 static char *basic_authentication_encode PARAMS ((const char *, const char *));
1107 static int known_authentication_scheme_p PARAMS ((const char *, const char *));
1109 time_t http_atotm PARAMS ((const char *));
1111 #define BEGINS_WITH(line, string_constant) \
1112 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1113 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1114 || !line[sizeof (string_constant) - 1]))
1116 #define SET_USER_AGENT(req) do { \
1117 if (!opt.useragent) \
1118 request_set_header (req, "User-Agent", \
1119 aprintf ("Wget/%s", version_string), rel_value); \
1120 else if (*opt.useragent) \
1121 request_set_header (req, "User-Agent", opt.useragent, rel_none); \
1124 /* Retrieve a document through HTTP protocol. It recognizes status
1125 code, and correctly handles redirections. It closes the network
1126 socket. If it receives an error from the functions below it, it
1127 will print it if there is enough information to do so (almost
1128 always), returning the error to the caller (i.e. http_loop).
1130 Various HTTP parameters are stored to hs.
1132 If PROXY is non-NULL, the connection will be made to the proxy
1133 server, and u->url will be requested. */
1135 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
1137 struct request *req;
1140 char *user, *passwd;
1144 wgint contlen, contrange;
1151 /* Set to 1 when the authorization has failed permanently and should
1152 not be tried again. */
1153 int auth_finished = 0;
1155 /* Whether NTLM authentication is used for this request. */
1158 /* Whether our connection to the remote host is through SSL. */
1162 struct response *resp;
1166 /* Whether this connection will be kept alive after the HTTP request
1170 /* Whether keep-alive should be inhibited.
1172 RFC 2068 requests that 1.0 clients not send keep-alive requests
1173 to proxies. This is because many 1.0 proxies do not interpret
1174 the Connection header and transfer it to the remote server,
1175 causing it to not close the connection and leave both the proxy
1176 and the client hanging. */
1177 int inhibit_keep_alive =
1178 !opt.http_keep_alive || opt.ignore_length || proxy != NULL;
1180 /* Headers sent when using POST. */
1181 wgint post_data_size = 0;
1183 int host_lookup_failed = 0;
1186 if (u->scheme == SCHEME_HTTPS)
1188 /* Initialize the SSL context. After this has once been done,
1189 it becomes a no-op. */
1192 scheme_disable (SCHEME_HTTPS);
1193 logprintf (LOG_NOTQUIET,
1194 _("Disabling SSL due to encountered errors.\n"));
1195 return SSLINITFAILED;
1198 #endif /* HAVE_SSL */
1200 if (!(*dt & HEAD_ONLY))
1201 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
1202 know the local filename so we can save to it. */
1203 assert (*hs->local_file != NULL);
1205 /* Initialize certain elements of struct http_stat. */
1210 hs->remote_time = NULL;
1215 /* Prepare the request to send. */
1217 req = request_new ();
1220 const char *meth = "GET";
1221 if (*dt & HEAD_ONLY)
1223 else if (opt.post_file_name || opt.post_data)
1225 /* Use the full path, i.e. one that includes the leading slash and
1226 the query string. E.g. if u->path is "foo/bar" and u->query is
1227 "param=value", full_path will be "/foo/bar?param=value". */
1230 /* When using SSL over proxy, CONNECT establishes a direct
1231 connection to the HTTPS server. Therefore use the same
1232 argument as when talking to the server directly. */
1233 && u->scheme != SCHEME_HTTPS
1236 meth_arg = xstrdup (u->url);
1238 meth_arg = url_full_path (u);
1239 request_set_method (req, meth, meth_arg);
1242 request_set_header (req, "Referer", (char *) hs->referer, rel_none);
1243 if (*dt & SEND_NOCACHE)
1244 request_set_header (req, "Pragma", "no-cache", rel_none);
1246 request_set_header (req, "Range",
1247 aprintf ("bytes=%s-",
1248 number_to_static_string (hs->restval)),
1250 SET_USER_AGENT (req);
1251 request_set_header (req, "Accept", "*/*", rel_none);
1253 /* Find the username and password for authentication. */
1256 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
1257 user = user ? user : (opt.http_user ? opt.http_user : opt.user);
1258 passwd = passwd ? passwd : (opt.http_passwd ? opt.http_passwd : opt.passwd);
1262 /* We have the username and the password, but haven't tried
1263 any authorization yet. Let's see if the "Basic" method
1264 works. If not, we'll come back here and construct a
1265 proper authorization method with the right challenges.
1267 If we didn't employ this kind of logic, every URL that
1268 requires authorization would have to be processed twice,
1269 which is very suboptimal and generates a bunch of false
1270 "unauthorized" errors in the server log.
1272 #### But this logic also has a serious problem when used
1273 with stronger authentications: we *first* transmit the
1274 username and the password in clear text, and *then* attempt a
1275 stronger authentication scheme. That cannot be right! We
1276 are only fortunate that almost everyone still uses the
1277 `Basic' scheme anyway.
1279 There should be an option to prevent this from happening, for
1280 those who use strong authentication schemes and value their
1282 request_set_header (req, "Authorization",
1283 basic_authentication_encode (user, passwd),
1290 char *proxy_user, *proxy_passwd;
1291 /* For normal username and password, URL components override
1292 command-line/wgetrc parameters. With proxy
1293 authentication, it's the reverse, because proxy URLs are
1294 normally the "permanent" ones, so command-line args
1295 should take precedence. */
1296 if (opt.proxy_user && opt.proxy_passwd)
1298 proxy_user = opt.proxy_user;
1299 proxy_passwd = opt.proxy_passwd;
1303 proxy_user = proxy->user;
1304 proxy_passwd = proxy->passwd;
1306 /* #### This does not appear right. Can't the proxy request,
1307 say, `Digest' authentication? */
1308 if (proxy_user && proxy_passwd)
1309 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd);
1311 /* If we're using a proxy, we will be connecting to the proxy
1315 /* Proxy authorization over SSL is handled below. */
1317 if (u->scheme != SCHEME_HTTPS)
1319 request_set_header (req, "Proxy-Authorization", proxyauth, rel_value);
1323 /* Whether we need to print the host header with braces around
1324 host, e.g. "Host: [3ffe:8100:200:2::2]:1234" instead of the
1325 usual "Host: symbolic-name:1234". */
1326 int squares = strchr (u->host, ':') != NULL;
1327 if (u->port == scheme_default_port (u->scheme))
1328 request_set_header (req, "Host",
1329 aprintf (squares ? "[%s]" : "%s", u->host),
1332 request_set_header (req, "Host",
1333 aprintf (squares ? "[%s]:%d" : "%s:%d",
1338 if (!inhibit_keep_alive)
1339 request_set_header (req, "Connection", "Keep-Alive", rel_none);
1342 request_set_header (req, "Cookie",
1343 cookie_header (wget_cookie_jar,
1344 u->host, u->port, u->path,
1346 u->scheme == SCHEME_HTTPS
1353 if (opt.post_data || opt.post_file_name)
1355 request_set_header (req, "Content-Type",
1356 "application/x-www-form-urlencoded", rel_none);
1358 post_data_size = strlen (opt.post_data);
1361 post_data_size = file_size (opt.post_file_name);
1362 if (post_data_size == -1)
1364 logprintf (LOG_NOTQUIET, "POST data file missing: %s\n",
1365 opt.post_file_name);
1369 request_set_header (req, "Content-Length",
1370 xstrdup (number_to_static_string (post_data_size)),
1374 /* Add the user headers. */
1375 if (opt.user_headers)
1378 for (i = 0; opt.user_headers[i]; i++)
1379 request_set_user_header (req, opt.user_headers[i]);
1383 /* We need to come back here when the initial attempt to retrieve
1384 without authorization header fails. (Expected to happen at least
1385 for the Digest authorization scheme.) */
1389 /* Establish the connection. */
1391 if (!inhibit_keep_alive)
1393 /* Look for a persistent connection to target host, unless a
1394 proxy is used. The exception is when SSL is in use, in which
1395 case the proxy is nothing but a passthrough to the target
1396 host, registered as a connection to the latter. */
1397 struct url *relevant = conn;
1399 if (u->scheme == SCHEME_HTTPS)
1403 if (persistent_available_p (relevant->host, relevant->port,
1405 relevant->scheme == SCHEME_HTTPS,
1409 &host_lookup_failed))
1411 sock = pconn.socket;
1412 using_ssl = pconn.ssl;
1413 logprintf (LOG_VERBOSE, _("Reusing existing connection to %s:%d.\n"),
1414 escnonprint (pconn.host), pconn.port);
1415 DEBUGP (("Reusing fd %d.\n", sock));
1416 if (pconn.authorized)
1417 /* If the connection is already authorized, the "Basic"
1418 authorization added by code above is unnecessary and
1420 request_remove_header (req, "Authorization");
1426 /* In its current implementation, persistent_available_p will
1427 look up conn->host in some cases. If that lookup failed, we
1428 don't need to bother with connect_to_host. */
1429 if (host_lookup_failed)
1435 sock = connect_to_host (conn->host, conn->port);
1444 return (retryable_socket_connect_error (errno)
1445 ? CONERROR : CONIMPOSSIBLE);
1449 if (proxy && u->scheme == SCHEME_HTTPS)
1451 /* When requesting SSL URLs through proxies, use the
1452 CONNECT method to request passthrough. */
1453 struct request *connreq = request_new ();
1454 request_set_method (connreq, "CONNECT",
1455 aprintf ("%s:%d", u->host, u->port));
1456 SET_USER_AGENT (connreq);
1459 request_set_header (connreq, "Proxy-Authorization",
1460 proxyauth, rel_value);
1461 /* Now that PROXYAUTH is part of the CONNECT request,
1462 zero it out so we don't send proxy authorization with
1463 the regular request below. */
1466 /* Examples in rfc2817 use the Host header in CONNECT
1467 requests. I don't see how that gains anything, given
1468 that the contents of Host would be exactly the same as
1469 the contents of CONNECT. */
1471 write_error = request_send (connreq, sock);
1472 request_free (connreq);
1473 if (write_error < 0)
1475 logprintf (LOG_VERBOSE, _("Failed writing to proxy: %s.\n"),
1477 CLOSE_INVALIDATE (sock);
1481 head = read_http_response_head (sock);
1484 logprintf (LOG_VERBOSE, _("Failed reading proxy response: %s\n"),
1486 CLOSE_INVALIDATE (sock);
1495 DEBUGP (("proxy responded with: [%s]\n", head));
1497 resp = resp_new (head);
1498 statcode = resp_status (resp, &message);
1501 if (statcode != 200)
1504 logprintf (LOG_NOTQUIET, _("Proxy tunneling failed: %s"),
1505 message ? escnonprint (message) : "?");
1506 xfree_null (message);
1509 xfree_null (message);
1511 /* SOCK is now *really* connected to u->host, so update CONN
1512 to reflect this. That way register_persistent will
1513 register SOCK as being connected to u->host:u->port. */
1517 if (conn->scheme == SCHEME_HTTPS)
1519 if (!ssl_connect (sock) || !ssl_check_certificate (sock, u->host))
1526 #endif /* HAVE_SSL */
1529 /* Send the request to server. */
1530 write_error = request_send (req, sock);
1532 if (write_error >= 0)
1536 DEBUGP (("[POST data: %s]\n", opt.post_data));
1537 write_error = fd_write (sock, opt.post_data, post_data_size, -1.0);
1539 else if (opt.post_file_name && post_data_size != 0)
1540 write_error = post_file (sock, opt.post_file_name, post_data_size);
1543 if (write_error < 0)
1545 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
1547 CLOSE_INVALIDATE (sock);
1551 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1552 proxy ? "Proxy" : "HTTP");
1557 head = read_http_response_head (sock);
1562 logputs (LOG_NOTQUIET, _("No data received.\n"));
1563 CLOSE_INVALIDATE (sock);
1569 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1571 CLOSE_INVALIDATE (sock);
1576 DEBUGP (("\n---response begin---\n%s---response end---\n", head));
1578 resp = resp_new (head);
1580 /* Check for status line. */
1582 statcode = resp_status (resp, &message);
1583 if (!opt.server_response)
1584 logprintf (LOG_VERBOSE, "%2d %s\n", statcode,
1585 message ? escnonprint (message) : "");
1588 logprintf (LOG_VERBOSE, "\n");
1589 print_server_response (resp, " ");
1592 if (!opt.ignore_length
1593 && resp_header_copy (resp, "Content-Length", hdrval, sizeof (hdrval)))
1597 parsed = str_to_wgint (hdrval, NULL, 10);
1598 if (parsed == WGINT_MAX && errno == ERANGE)
1600 #### If Content-Length is out of range, it most likely
1601 means that the file is larger than 2G and that we're
1602 compiled without LFS. In that case we should probably
1603 refuse to even attempt to download the file. */
1609 /* Check for keep-alive related responses. */
1610 if (!inhibit_keep_alive && contlen != -1)
1612 if (resp_header_copy (resp, "Keep-Alive", NULL, 0))
1614 else if (resp_header_copy (resp, "Connection", hdrval, sizeof (hdrval)))
1616 if (0 == strcasecmp (hdrval, "Keep-Alive"))
1621 /* The server has promised that it will not close the connection
1622 when we're done. This means that we can register it. */
1623 register_persistent (conn->host, conn->port, sock, using_ssl);
1625 if (statcode == HTTP_STATUS_UNAUTHORIZED)
1627 /* Authorization is required. */
1628 if (keep_alive && skip_short_body (sock, contlen))
1629 CLOSE_FINISH (sock);
1631 CLOSE_INVALIDATE (sock);
1632 pconn.authorized = 0;
1633 if (!auth_finished && (user && passwd))
1635 /* IIS sends multiple copies of WWW-Authenticate, one with
1636 the value "negotiate", and other(s) with data. Loop over
1637 all the occurrences and pick the one we recognize. */
1639 const char *wabeg, *waend;
1640 char *www_authenticate = NULL;
1642 (wapos = resp_header_locate (resp, "WWW-Authenticate", wapos,
1643 &wabeg, &waend)) != -1;
1645 if (known_authentication_scheme_p (wabeg, waend))
1647 BOUNDED_TO_ALLOCA (wabeg, waend, www_authenticate);
1651 if (!www_authenticate)
1652 /* If the authentication header is missing or
1653 unrecognized, there's no sense in retrying. */
1654 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1655 else if (BEGINS_WITH (www_authenticate, "Basic"))
1656 /* If the authentication scheme is "Basic", which we send
1657 by default, there's no sense in retrying either. (This
1658 should be changed when we stop sending "Basic" data by
1664 pth = url_full_path (u);
1665 request_set_header (req, "Authorization",
1666 create_authorization_line (www_authenticate,
1668 request_method (req),
1672 if (BEGINS_WITH (www_authenticate, "NTLM"))
1675 goto retry_with_auth;
1678 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1682 else /* statcode != HTTP_STATUS_UNAUTHORIZED */
1684 /* Kludge: if NTLM is used, mark the TCP connection as authorized. */
1686 pconn.authorized = 1;
1690 hs->statcode = statcode;
1692 hs->error = xstrdup (_("Malformed status line"));
1694 hs->error = xstrdup (_("(no description)"));
1696 hs->error = xstrdup (message);
1699 type = resp_header_strdup (resp, "Content-Type");
1702 char *tmp = strchr (type, ';');
1705 while (tmp > type && ISSPACE (tmp[-1]))
1710 hs->newloc = resp_header_strdup (resp, "Location");
1711 hs->remote_time = resp_header_strdup (resp, "Last-Modified");
1713 /* Handle (possibly multiple instances of) the Set-Cookie header. */
1717 const char *scbeg, *scend;
1718 /* The jar should have been created by now. */
1719 assert (wget_cookie_jar != NULL);
1721 (scpos = resp_header_locate (resp, "Set-Cookie", scpos,
1722 &scbeg, &scend)) != -1;
1725 char *set_cookie; BOUNDED_TO_ALLOCA (scbeg, scend, set_cookie);
1728 /* u->path doesn't begin with /, which cookies.c expects. */
1729 pth = (char *) alloca (1 + strlen (u->path) + 1);
1731 strcpy (pth + 1, u->path);
1733 cookie_handle_set_cookie (wget_cookie_jar, u->host, u->port, pth,
1738 if (resp_header_copy (resp, "Content-Range", hdrval, sizeof (hdrval)))
1740 wgint first_byte_pos, last_byte_pos, entity_length;
1741 if (parse_content_range (hdrval, &first_byte_pos, &last_byte_pos,
1743 contrange = first_byte_pos;
1748 /* 20x responses are counted among successful by default. */
1749 if (H_20X (statcode))
1752 /* Return if redirected. */
1753 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1755 /* RFC2068 says that in case of the 300 (multiple choices)
1756 response, the server can output a preferred URL through
1757 `Location' header; otherwise, the request should be treated
1758 like GET. So, if the location is set, it will be a
1759 redirection; otherwise, just proceed normally. */
1760 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1764 logprintf (LOG_VERBOSE,
1765 _("Location: %s%s\n"),
1766 hs->newloc ? escnonprint_uri (hs->newloc) : _("unspecified"),
1767 hs->newloc ? _(" [following]") : "");
1768 if (keep_alive && skip_short_body (sock, contlen))
1769 CLOSE_FINISH (sock);
1771 CLOSE_INVALIDATE (sock);
1777 /* If content-type is not given, assume text/html. This is because
1778 of the multitude of broken CGI's that "forget" to generate the
1781 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) ||
1782 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S)))
1787 if (opt.html_extension && (*dt & TEXTHTML))
1788 /* -E / --html-extension / html_extension = on was specified, and this is a
1789 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1790 already the file's suffix, tack on ".html". */
1792 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1794 if (last_period_in_local_filename == NULL
1795 || !(0 == strcasecmp (last_period_in_local_filename, ".htm")
1796 || 0 == strcasecmp (last_period_in_local_filename, ".html")))
1798 size_t local_filename_len = strlen(*hs->local_file);
1800 *hs->local_file = xrealloc(*hs->local_file,
1801 local_filename_len + sizeof(".html"));
1802 strcpy(*hs->local_file + local_filename_len, ".html");
1804 *dt |= ADDED_HTML_EXTENSION;
1808 if (statcode == HTTP_STATUS_RANGE_NOT_SATISFIABLE)
1810 /* If `-c' is in use and the file has been fully downloaded (or
1811 the remote file has shrunk), Wget effectively requests bytes
1812 after the end of file and the server response with 416. */
1813 logputs (LOG_VERBOSE, _("\
1814 \n The file is already fully retrieved; nothing to do.\n\n"));
1815 /* In case the caller inspects. */
1818 /* Mark as successfully retrieved. */
1821 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1822 might be more bytes in the body. */
1823 return RETRUNNEEDED;
1825 if ((contrange != 0 && contrange != hs->restval)
1826 || (H_PARTIAL (statcode) && !contrange))
1828 /* The Range request was somehow misunderstood by the server.
1831 CLOSE_INVALIDATE (sock);
1834 hs->contlen = contlen + contrange;
1840 /* No need to print this output if the body won't be
1841 downloaded at all, or if the original server response is
1843 logputs (LOG_VERBOSE, _("Length: "));
1846 logputs (LOG_VERBOSE, with_thousand_seps (contlen + contrange));
1847 if (contlen + contrange >= 1024)
1848 logprintf (LOG_VERBOSE, " (%s)",
1849 human_readable (contlen + contrange));
1852 if (contlen >= 1024)
1853 logprintf (LOG_VERBOSE, _(", %s (%s) remaining"),
1854 with_thousand_seps (contlen),
1855 human_readable (contlen));
1857 logprintf (LOG_VERBOSE, _(", %s remaining"),
1858 with_thousand_seps (contlen));
1862 logputs (LOG_VERBOSE,
1863 opt.ignore_length ? _("ignored") : _("unspecified"));
1865 logprintf (LOG_VERBOSE, " [%s]\n", escnonprint (type));
1867 logputs (LOG_VERBOSE, "\n");
1871 type = NULL; /* We don't need it any more. */
1873 /* Return if we have no intention of further downloading. */
1874 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1876 /* In case the caller cares to look... */
1880 /* Pre-1.10 Wget used CLOSE_INVALIDATE here. Now we trust the
1881 servers not to send body in response to a HEAD request. If
1882 you encounter such a server (more likely a broken CGI), use
1883 `--no-http-keep-alive'. */
1884 CLOSE_FINISH (sock);
1885 return RETRFINISHED;
1888 /* Open the local file. */
1891 mkalldirs (*hs->local_file);
1893 rotate_backups (*hs->local_file);
1895 fp = fopen (*hs->local_file, "ab");
1896 else if (opt.noclobber || opt.always_rest || opt.timestamping || opt.dirstruct
1897 || opt.output_document)
1898 fp = fopen (*hs->local_file, "wb");
1901 fp = fopen_excl (*hs->local_file, 1);
1902 if (!fp && errno == EEXIST)
1904 /* We cannot just invent a new name and use it (which is
1905 what functions like unique_create typically do)
1906 because we told the user we'd use this name.
1907 Instead, return and retry the download. */
1908 logprintf (LOG_NOTQUIET,
1909 _("%s has sprung into existence.\n"),
1911 CLOSE_INVALIDATE (sock);
1912 return FOPEN_EXCL_ERR;
1917 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1918 CLOSE_INVALIDATE (sock);
1925 /* #### This confuses the timestamping code that checks for file
1926 size. Maybe we should save some additional information? */
1927 if (opt.save_headers)
1928 fwrite (head, 1, strlen (head), fp);
1930 /* Download the request body. */
1933 flags |= rb_read_exactly;
1934 if (hs->restval > 0 && contrange == 0)
1935 /* If the server ignored our range request, instruct fd_read_body
1936 to skip the first RESTVAL bytes of body. */
1937 flags |= rb_skip_startpos;
1938 hs->len = hs->restval;
1940 hs->res = fd_read_body (sock, fp, contlen != -1 ? contlen : 0,
1941 hs->restval, &hs->rd_size, &hs->len, &hs->dltime,
1945 CLOSE_FINISH (sock);
1947 CLOSE_INVALIDATE (sock);
1950 /* Close or flush the file. We have to be careful to check for
1951 error here. Checking the result of fwrite() is not enough --
1952 errors could go unnoticed! */
1955 flush_res = fclose (fp);
1957 flush_res = fflush (fp);
1958 if (flush_res == EOF)
1963 return RETRFINISHED;
1966 /* The genuine HTTP loop! This is the part where the retrieval is
1967 retried, and retried, and retried, and... */
1969 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1970 int *dt, struct url *proxy)
1973 int use_ts, got_head = 0; /* time-stamping info */
1974 char *filename_plus_orig_suffix;
1975 char *local_filename = NULL;
1976 char *tms, *locf, *tmrate;
1978 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1979 wgint local_size = 0; /* the size of the local file */
1980 size_t filename_len;
1981 struct http_stat hstat; /* HTTP status */
1985 /* This used to be done in main(), but it's a better idea to do it
1986 here so that we don't go through the hoops if we're just using
1990 if (!wget_cookie_jar)
1991 wget_cookie_jar = cookie_jar_new ();
1992 if (opt.cookies_input && !cookies_loaded_p)
1994 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
1995 cookies_loaded_p = 1;
2001 /* Warn on (likely bogus) wildcard usage in HTTP. */
2002 if (has_wildcards_p (u->path))
2003 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
2007 /* Determine the local filename. */
2008 if (local_file && *local_file)
2009 hstat.local_file = local_file;
2010 else if (local_file && !opt.output_document)
2012 *local_file = url_file_name (u);
2013 hstat.local_file = local_file;
2017 dummy = url_file_name (u);
2018 hstat.local_file = &dummy;
2019 /* be honest about where we will save the file */
2020 if (local_file && opt.output_document)
2021 *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document);
2024 if (!opt.output_document)
2025 locf = *hstat.local_file;
2027 locf = opt.output_document;
2029 hstat.referer = referer;
2031 filename_len = strlen (*hstat.local_file);
2032 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
2034 if (opt.noclobber && file_exists_p (*hstat.local_file))
2036 /* If opt.noclobber is turned on and file already exists, do not
2037 retrieve the file */
2038 logprintf (LOG_VERBOSE, _("\
2039 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
2040 /* If the file is there, we suppose it's retrieved OK. */
2043 /* #### Bogusness alert. */
2044 /* If its suffix is "html" or "htm" or similar, assume text/html. */
2045 if (has_html_suffix_p (*hstat.local_file))
2053 if (opt.timestamping)
2055 int local_dot_orig_file_exists = 0;
2057 if (opt.backup_converted)
2058 /* If -K is specified, we'll act on the assumption that it was specified
2059 last time these files were downloaded as well, and instead of just
2060 comparing local file X against server file X, we'll compare local
2061 file X.orig (if extant, else X) against server file X. If -K
2062 _wasn't_ specified last time, or the server contains files called
2063 *.orig, -N will be back to not operating correctly with -k. */
2065 /* Would a single s[n]printf() call be faster? --dan
2067 Definitely not. sprintf() is horribly slow. It's a
2068 different question whether the difference between the two
2069 affects a program. Usually I'd say "no", but at one
2070 point I profiled Wget, and found that a measurable and
2071 non-negligible amount of time was lost calling sprintf()
2072 in url.c. Replacing sprintf with inline calls to
2073 strcpy() and number_to_string() made a difference.
2075 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
2076 memcpy (filename_plus_orig_suffix + filename_len,
2077 ".orig", sizeof (".orig"));
2079 /* Try to stat() the .orig file. */
2080 if (stat (filename_plus_orig_suffix, &st) == 0)
2082 local_dot_orig_file_exists = 1;
2083 local_filename = filename_plus_orig_suffix;
2087 if (!local_dot_orig_file_exists)
2088 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
2089 if (stat (*hstat.local_file, &st) == 0)
2090 local_filename = *hstat.local_file;
2092 if (local_filename != NULL)
2093 /* There was a local file, so we'll check later to see if the version
2094 the server has is the same version we already have, allowing us to
2100 /* Modification time granularity is 2 seconds for Windows, so
2101 increase local time by 1 second for later comparison. */
2104 local_size = st.st_size;
2108 /* Reset the counter. */
2114 /* Increment the pass counter. */
2116 sleep_between_retrievals (count);
2117 /* Get the current time string. */
2118 tms = time_str (NULL);
2119 /* Print fetch message, if opt.verbose. */
2122 char *hurl = url_string (u, 1);
2126 sprintf (tmp, _("(try:%2d)"), count);
2127 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
2128 tms, hurl, tmp, locf);
2130 ws_changetitle (hurl);
2135 /* Default document type is empty. However, if spider mode is
2136 on or time-stamping is employed, HEAD_ONLY commands is
2137 encoded within *dt. */
2138 if (opt.spider || (use_ts && !got_head))
2143 /* Decide whether or not to restart. */
2146 hstat.restval = hstat.len; /* continue where we left off */
2147 else if (opt.always_rest
2148 && stat (locf, &st) == 0
2149 && S_ISREG (st.st_mode))
2150 hstat.restval = st.st_size;
2152 /* Decide whether to send the no-cache directive. We send it in
2154 a) we're using a proxy, and we're past our first retrieval.
2155 Some proxies are notorious for caching incomplete data, so
2156 we require a fresh get.
2157 b) caching is explicitly inhibited. */
2158 if ((proxy && count > 1) /* a */
2159 || !opt.allow_cache /* b */
2161 *dt |= SEND_NOCACHE;
2163 *dt &= ~SEND_NOCACHE;
2165 /* Try fetching the document, or at least its head. */
2166 err = gethttp (u, &hstat, dt, proxy);
2168 /* It's unfortunate that wget determines the local filename before finding
2169 out the Content-Type of the file. Barring a major restructuring of the
2170 code, we need to re-set locf here, since gethttp() may have xrealloc()d
2171 *hstat.local_file to tack on ".html". */
2172 if (!opt.output_document)
2173 locf = *hstat.local_file;
2176 tms = time_str (NULL);
2177 /* Get the new location (with or without the redirection). */
2179 *newloc = xstrdup (hstat.newloc);
2182 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
2183 case CONERROR: case READERR: case WRITEFAILED:
2184 case RANGEERR: case FOPEN_EXCL_ERR:
2185 /* Non-fatal errors continue executing the loop, which will
2186 bring them to "while" statement at the end, to judge
2187 whether the number of tries was exceeded. */
2188 free_hstat (&hstat);
2189 printwhat (count, opt.ntry);
2190 if (err == FOPEN_EXCL_ERR)
2192 /* Re-determine the file name. */
2193 if (local_file && *local_file)
2195 xfree (*local_file);
2196 *local_file = url_file_name (u);
2197 hstat.local_file = local_file;
2202 dummy = url_file_name (u);
2203 hstat.local_file = &dummy;
2205 /* be honest about where we will save the file */
2206 if (local_file && opt.output_document)
2207 *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document);
2208 if (!opt.output_document)
2209 locf = *hstat.local_file;
2211 locf = opt.output_document;
2214 case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED:
2215 case SSLINITFAILED: case CONTNOTSUPPORTED:
2216 /* Fatal errors just return from the function. */
2217 free_hstat (&hstat);
2220 case FWRITEERR: case FOPENERR:
2221 /* Another fatal error. */
2222 logputs (LOG_VERBOSE, "\n");
2223 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
2224 *hstat.local_file, strerror (errno));
2225 free_hstat (&hstat);
2229 /* Another fatal error. */
2230 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
2231 free_hstat (&hstat);
2235 /* Return the new location to the caller. */
2238 logprintf (LOG_NOTQUIET,
2239 _("ERROR: Redirection (%d) without location.\n"),
2241 free_hstat (&hstat);
2245 free_hstat (&hstat);
2249 /* The file was already fully retrieved. */
2250 free_hstat (&hstat);
2254 /* Deal with you later. */
2257 /* All possibilities should have been exhausted. */
2260 if (!(*dt & RETROKF))
2264 /* #### Ugly ugly ugly! */
2265 char *hurl = url_string (u, 1);
2266 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
2269 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
2270 tms, hstat.statcode, escnonprint (hstat.error));
2271 logputs (LOG_VERBOSE, "\n");
2272 free_hstat (&hstat);
2277 /* Did we get the time-stamp? */
2280 if (opt.timestamping && !hstat.remote_time)
2282 logputs (LOG_NOTQUIET, _("\
2283 Last-modified header missing -- time-stamps turned off.\n"));
2285 else if (hstat.remote_time)
2287 /* Convert the date-string into struct tm. */
2288 tmr = http_atotm (hstat.remote_time);
2289 if (tmr == (time_t) (-1))
2290 logputs (LOG_VERBOSE, _("\
2291 Last-modified header invalid -- time-stamp ignored.\n"));
2295 /* The time-stamping section. */
2300 use_ts = 0; /* no more time-stamping */
2301 count = 0; /* the retrieve count for HEAD is
2303 if (hstat.remote_time && tmr != (time_t) (-1))
2305 /* Now time-stamping can be used validly. Time-stamping
2306 means that if the sizes of the local and remote file
2307 match, and local file is newer than the remote file,
2308 it will not be retrieved. Otherwise, the normal
2309 download procedure is resumed. */
2311 (hstat.contlen == -1 || local_size == hstat.contlen))
2313 logprintf (LOG_VERBOSE, _("\
2314 Server file no newer than local file `%s' -- not retrieving.\n\n"),
2316 free_hstat (&hstat);
2320 else if (tml >= tmr)
2321 logprintf (LOG_VERBOSE, _("\
2322 The sizes do not match (local %s) -- retrieving.\n"),
2323 number_to_static_string (local_size));
2325 logputs (LOG_VERBOSE,
2326 _("Remote file is newer, retrieving.\n"));
2328 free_hstat (&hstat);
2331 if ((tmr != (time_t) (-1))
2333 && ((hstat.len == hstat.contlen) ||
2334 ((hstat.res == 0) &&
2335 ((hstat.contlen == -1) ||
2336 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
2338 /* #### This code repeats in http.c and ftp.c. Move it to a
2340 const char *fl = NULL;
2341 if (opt.output_document)
2343 if (output_stream_regular)
2344 fl = opt.output_document;
2347 fl = *hstat.local_file;
2351 /* End of time-stamping section. */
2355 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode,
2356 escnonprint (hstat.error));
2361 tmrate = retr_rate (hstat.rd_size, hstat.dltime, 0);
2363 if (hstat.len == hstat.contlen)
2367 logprintf (LOG_VERBOSE,
2368 _("%s (%s) - `%s' saved [%s/%s]\n\n"),
2370 number_to_static_string (hstat.len),
2371 number_to_static_string (hstat.contlen));
2372 logprintf (LOG_NONVERBOSE,
2373 "%s URL:%s [%s/%s] -> \"%s\" [%d]\n",
2375 number_to_static_string (hstat.len),
2376 number_to_static_string (hstat.contlen),
2380 total_downloaded_bytes += hstat.len;
2382 /* Remember that we downloaded the file for later ".orig" code. */
2383 if (*dt & ADDED_HTML_EXTENSION)
2384 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2386 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2388 free_hstat (&hstat);
2392 else if (hstat.res == 0) /* No read error */
2394 if (hstat.contlen == -1) /* We don't know how much we were supposed
2395 to get, so assume we succeeded. */
2399 logprintf (LOG_VERBOSE,
2400 _("%s (%s) - `%s' saved [%s]\n\n"),
2402 number_to_static_string (hstat.len));
2403 logprintf (LOG_NONVERBOSE,
2404 "%s URL:%s [%s] -> \"%s\" [%d]\n",
2405 tms, u->url, number_to_static_string (hstat.len),
2409 total_downloaded_bytes += hstat.len;
2411 /* Remember that we downloaded the file for later ".orig" code. */
2412 if (*dt & ADDED_HTML_EXTENSION)
2413 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2415 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2417 free_hstat (&hstat);
2421 else if (hstat.len < hstat.contlen) /* meaning we lost the
2422 connection too soon */
2424 logprintf (LOG_VERBOSE,
2425 _("%s (%s) - Connection closed at byte %s. "),
2426 tms, tmrate, number_to_static_string (hstat.len));
2427 printwhat (count, opt.ntry);
2428 free_hstat (&hstat);
2431 else if (!opt.kill_longer) /* meaning we got more than expected */
2433 logprintf (LOG_VERBOSE,
2434 _("%s (%s) - `%s' saved [%s/%s])\n\n"),
2436 number_to_static_string (hstat.len),
2437 number_to_static_string (hstat.contlen));
2438 logprintf (LOG_NONVERBOSE,
2439 "%s URL:%s [%s/%s] -> \"%s\" [%d]\n",
2441 number_to_static_string (hstat.len),
2442 number_to_static_string (hstat.contlen),
2445 total_downloaded_bytes += hstat.len;
2447 /* Remember that we downloaded the file for later ".orig" code. */
2448 if (*dt & ADDED_HTML_EXTENSION)
2449 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2451 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2453 free_hstat (&hstat);
2457 else /* the same, but not accepted */
2459 logprintf (LOG_VERBOSE,
2460 _("%s (%s) - Connection closed at byte %s/%s. "),
2462 number_to_static_string (hstat.len),
2463 number_to_static_string (hstat.contlen));
2464 printwhat (count, opt.ntry);
2465 free_hstat (&hstat);
2469 else /* now hstat.res can only be -1 */
2471 if (hstat.contlen == -1)
2473 logprintf (LOG_VERBOSE,
2474 _("%s (%s) - Read error at byte %s (%s)."),
2475 tms, tmrate, number_to_static_string (hstat.len),
2477 printwhat (count, opt.ntry);
2478 free_hstat (&hstat);
2481 else /* hstat.res == -1 and contlen is given */
2483 logprintf (LOG_VERBOSE,
2484 _("%s (%s) - Read error at byte %s/%s (%s). "),
2486 number_to_static_string (hstat.len),
2487 number_to_static_string (hstat.contlen),
2489 printwhat (count, opt.ntry);
2490 free_hstat (&hstat);
2496 while (!opt.ntry || (count < opt.ntry));
2500 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
2501 than local timezone.
2503 mktime is similar but assumes struct tm, also known as the
2504 "broken-down" form of time, is in local time zone. mktime_from_utc
2505 uses mktime to make the conversion understanding that an offset
2506 will be introduced by the local time assumption.
2508 mktime_from_utc then measures the introduced offset by applying
2509 gmtime to the initial result and applying mktime to the resulting
2510 "broken-down" form. The difference between the two mktime results
2511 is the measured offset which is then subtracted from the initial
2512 mktime result to yield a calendar time which is the value returned.
2514 tm_isdst in struct tm is set to 0 to force mktime to introduce a
2515 consistent offset (the non DST offset) since tm and tm+o might be
2516 on opposite sides of a DST change.
2518 Some implementations of mktime return -1 for the nonexistent
2519 localtime hour at the beginning of DST. In this event, use
2520 mktime(tm - 1hr) + 3600.
2524 gmtime(t+o) --> tm+o
2525 mktime(tm+o) --> t+2o
2526 t+o - (t+2o - t+o) = t
2528 Note that glibc contains a function of the same purpose named
2529 `timegm' (reverse of gmtime). But obviously, it is not universally
2530 available, and unfortunately it is not straightforwardly
2531 extractable for use here. Perhaps configure should detect timegm
2532 and use it where available.
2534 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
2535 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
2536 Further improved by Roger with assistance from Edward J. Sabol
2537 based on input by Jamie Zawinski. */
2540 mktime_from_utc (struct tm *t)
2551 return -1; /* can't deal with output from strptime */
2562 return -1; /* can't deal with output from gmtime */
2565 return (tl - (tb - tl));
2568 /* Check whether the result of strptime() indicates success.
2569 strptime() returns the pointer to how far it got to in the string.
2570 The processing has been successful if the string is at `GMT' or
2571 `+X', or at the end of the string.
2573 In extended regexp parlance, the function returns 1 if P matches
2574 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2575 can return) is considered a failure and 0 is returned. */
2577 check_end (const char *p)
2581 while (ISSPACE (*p))
2584 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2585 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
2591 /* Convert the textual specification of time in TIME_STRING to the
2592 number of seconds since the Epoch.
2594 TIME_STRING can be in any of the three formats RFC2068 allows the
2595 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
2596 Timezones are ignored, and should be GMT.
2598 Return the computed time_t representation, or -1 if the conversion
2601 This function uses strptime with various string formats for parsing
2602 TIME_STRING. This results in a parser that is not as lenient in
2603 interpreting TIME_STRING as I would like it to be. Being based on
2604 strptime, it always allows shortened months, one-digit days, etc.,
2605 but due to the multitude of formats in which time can be
2606 represented, an ideal HTTP time parser would be even more
2607 forgiving. It should completely ignore things like week days and
2608 concentrate only on the various forms of representing years,
2609 months, days, hours, minutes, and seconds. For example, it would
2610 be nice if it accepted ISO 8601 out of the box.
2612 I've investigated free and PD code for this purpose, but none was
2613 usable. getdate was big and unwieldy, and had potential copyright
2614 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2615 distributed with phttpd, is excellent, but we cannot use it because
2616 it is not assigned to the FSF. So I stuck it with strptime. */
2619 http_atotm (const char *time_string)
2621 /* NOTE: Solaris strptime man page claims that %n and %t match white
2622 space, but that's not universally available. Instead, we simply
2623 use ` ' to mean "skip all WS", which works under all strptime
2624 implementations I've tested. */
2626 static const char *time_formats[] = {
2627 "%a, %d %b %Y %T", /* rfc1123: Thu, 29 Jan 1998 22:12:57 */
2628 "%A, %d-%b-%y %T", /* rfc850: Thursday, 29-Jan-98 22:12:57 */
2629 "%a, %d-%b-%Y %T", /* rfc850+: Thu, 29-Jan-1998 22:12:57
2630 (post-y2k-rfc850; apparently google
2631 uses this for their cookies.) */
2632 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2636 for (i = 0; i < countof (time_formats); i++)
2640 /* Some versions of strptime use the existing contents of struct
2641 tm to recalculate the date according to format. Zero it out
2642 to prevent garbage from the stack influencing strptime. */
2645 /* Solaris strptime fails to recognize English month names in
2646 non-English locales, which we work around by not setting the
2647 LC_TIME category. Another way would be to temporarily set
2648 locale to C before invoking strptime, but that's slow and
2649 messy. GNU strptime does not have this problem because it
2650 recognizes English month names along with the local ones. */
2652 if (check_end (strptime (time_string, time_formats[i], &t)))
2653 return mktime_from_utc (&t);
2656 /* All formats have failed. */
2660 /* Authorization support: We support three authorization schemes:
2662 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2664 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2665 consisting of answering to the server's challenge with the proper
2668 * `NTLM' ("NT Lan Manager") scheme, based on code written by Daniel
2669 Stenberg for libcurl. Like digest, NTLM is based on a
2670 challenge-response mechanism, but unlike digest, it is non-standard
2671 (authenticates TCP connections rather than requests), undocumented
2672 and Microsoft-specific. */
2674 /* Create the authentication header contents for the `Basic' scheme.
2675 This is done by encoding the string "USER:PASS" to base64 and
2676 prepending the string "Basic " in front of it. */
2679 basic_authentication_encode (const char *user, const char *passwd)
2682 int len1 = strlen (user) + 1 + strlen (passwd);
2684 t1 = (char *)alloca (len1 + 1);
2685 sprintf (t1, "%s:%s", user, passwd);
2687 t2 = (char *)alloca (BASE64_LENGTH (len1) + 1);
2688 base64_encode (t1, len1, t2);
2690 return concat_strings ("Basic ", t2, (char *) 0);
2693 #define SKIP_WS(x) do { \
2694 while (ISSPACE (*(x))) \
2698 #ifdef ENABLE_DIGEST
2699 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2700 of a field in such a header. If the field is the one specified by
2701 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2702 digest authorization code), extract its value in the (char*)
2703 variable pointed by RET. Returns negative on a malformed header,
2704 or number of bytes that have been parsed by this call. */
2706 extract_header_attr (const char *au, const char *attr_name, char **ret)
2709 const char *cp = au;
2711 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2713 cp += strlen (attr_name);
2726 for (ep = cp; *ep && *ep != '\"'; ep++)
2731 *ret = strdupdelim (cp, ep);
2738 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2739 an array of 16 bytes containing the hash keys, and BUF should be a
2740 buffer of 33 writable characters (32 for hex digits plus one for
2741 zero termination). */
2743 dump_hash (unsigned char *buf, const unsigned char *hash)
2747 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2749 *buf++ = XNUM_TO_digit (*hash >> 4);
2750 *buf++ = XNUM_TO_digit (*hash & 0xf);
2755 /* Take the line apart to find the challenge, and compose a digest
2756 authorization header. See RFC2069 section 2.1.2. */
2758 digest_authentication_encode (const char *au, const char *user,
2759 const char *passwd, const char *method,
2762 static char *realm, *opaque, *nonce;
2767 { "realm", &realm },
2768 { "opaque", &opaque },
2773 realm = opaque = nonce = NULL;
2775 au += 6; /* skip over `Digest' */
2781 for (i = 0; i < countof (options); i++)
2783 int skip = extract_header_attr (au, options[i].name,
2784 options[i].variable);
2788 xfree_null (opaque);
2798 if (i == countof (options))
2800 while (*au && *au != '=')
2808 while (*au && *au != '\"')
2815 while (*au && *au != ',')
2820 if (!realm || !nonce || !user || !passwd || !path || !method)
2823 xfree_null (opaque);
2828 /* Calculate the digest value. */
2830 ALLOCA_MD5_CONTEXT (ctx);
2831 unsigned char hash[MD5_HASHLEN];
2832 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2833 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2835 /* A1BUF = H(user ":" realm ":" password) */
2837 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2838 gen_md5_update ((unsigned char *)":", 1, ctx);
2839 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2840 gen_md5_update ((unsigned char *)":", 1, ctx);
2841 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2842 gen_md5_finish (ctx, hash);
2843 dump_hash (a1buf, hash);
2845 /* A2BUF = H(method ":" path) */
2847 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2848 gen_md5_update ((unsigned char *)":", 1, ctx);
2849 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2850 gen_md5_finish (ctx, hash);
2851 dump_hash (a2buf, hash);
2853 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2855 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2856 gen_md5_update ((unsigned char *)":", 1, ctx);
2857 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2858 gen_md5_update ((unsigned char *)":", 1, ctx);
2859 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2860 gen_md5_finish (ctx, hash);
2861 dump_hash (response_digest, hash);
2863 res = (char*) xmalloc (strlen (user)
2868 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2869 + (opaque ? strlen (opaque) : 0)
2871 sprintf (res, "Digest \
2872 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2873 user, realm, nonce, path, response_digest);
2876 char *p = res + strlen (res);
2877 strcat (p, ", opaque=\"");
2884 #endif /* ENABLE_DIGEST */
2886 /* Computing the size of a string literal must take into account that
2887 value returned by sizeof includes the terminating \0. */
2888 #define STRSIZE(literal) (sizeof (literal) - 1)
2890 /* Whether chars in [b, e) begin with the literal string provided as
2891 first argument and are followed by whitespace or terminating \0.
2892 The comparison is case-insensitive. */
2893 #define STARTS(literal, b, e) \
2894 ((e) - (b) >= STRSIZE (literal) \
2895 && 0 == strncasecmp (b, literal, STRSIZE (literal)) \
2896 && ((e) - (b) == STRSIZE (literal) \
2897 || ISSPACE (b[STRSIZE (literal)])))
2900 known_authentication_scheme_p (const char *hdrbeg, const char *hdrend)
2902 return STARTS ("Basic", hdrbeg, hdrend)
2903 #ifdef ENABLE_DIGEST
2904 || STARTS ("Digest", hdrbeg, hdrend)
2907 || STARTS ("NTLM", hdrbeg, hdrend)
2914 /* Create the HTTP authorization request header. When the
2915 `WWW-Authenticate' response header is seen, according to the
2916 authorization scheme specified in that header (`Basic' and `Digest'
2917 are supported by the current implementation), produce an
2918 appropriate HTTP authorization request header. */
2920 create_authorization_line (const char *au, const char *user,
2921 const char *passwd, const char *method,
2922 const char *path, int *finished)
2924 /* We are called only with known schemes, so we can dispatch on the
2926 switch (TOUPPER (*au))
2928 case 'B': /* Basic */
2930 return basic_authentication_encode (user, passwd);
2931 #ifdef ENABLE_DIGEST
2932 case 'D': /* Digest */
2934 return digest_authentication_encode (au, user, passwd, method, path);
2937 case 'N': /* NTLM */
2938 if (!ntlm_input (&pconn.ntlm, au))
2943 return ntlm_output (&pconn.ntlm, user, passwd, finished);
2946 /* We shouldn't get here -- this function should be only called
2947 with values approved by known_authentication_scheme_p. */
2955 if (wget_cookie_jar)
2956 cookie_jar_save (wget_cookie_jar, opt.cookies_output);
2962 xfree_null (pconn.host);
2963 if (wget_cookie_jar)
2964 cookie_jar_delete (wget_cookie_jar);