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 /* Check if pconn.socket is talking to HOST under another name.
973 This happens often when both sites are virtual hosts
974 distinguished only by name and served by the same network
975 interface, and hence the same web server (possibly set up by
976 the ISP and serving many different web sites). This
977 admittedly unconventional 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 that
987 name-based 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. */
1161 /* Whether a HEAD request will be issued (as opposed to GET or
1163 int head_only = *dt & HEAD_ONLY;
1166 struct response *resp;
1170 /* Whether this connection will be kept alive after the HTTP request
1174 /* Whether keep-alive should be inhibited.
1176 RFC 2068 requests that 1.0 clients not send keep-alive requests
1177 to proxies. This is because many 1.0 proxies do not interpret
1178 the Connection header and transfer it to the remote server,
1179 causing it to not close the connection and leave both the proxy
1180 and the client hanging. */
1181 int inhibit_keep_alive =
1182 !opt.http_keep_alive || opt.ignore_length || proxy != NULL;
1184 /* Headers sent when using POST. */
1185 wgint post_data_size = 0;
1187 int host_lookup_failed = 0;
1190 if (u->scheme == SCHEME_HTTPS)
1192 /* Initialize the SSL context. After this has once been done,
1193 it becomes a no-op. */
1196 scheme_disable (SCHEME_HTTPS);
1197 logprintf (LOG_NOTQUIET,
1198 _("Disabling SSL due to encountered errors.\n"));
1199 return SSLINITFAILED;
1202 #endif /* HAVE_SSL */
1205 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
1206 know the local filename so we can save to it. */
1207 assert (*hs->local_file != NULL);
1209 /* Initialize certain elements of struct http_stat. */
1214 hs->remote_time = NULL;
1219 /* Prepare the request to send. */
1221 req = request_new ();
1224 const char *meth = "GET";
1227 else if (opt.post_file_name || opt.post_data)
1229 /* Use the full path, i.e. one that includes the leading slash and
1230 the query string. E.g. if u->path is "foo/bar" and u->query is
1231 "param=value", full_path will be "/foo/bar?param=value". */
1234 /* When using SSL over proxy, CONNECT establishes a direct
1235 connection to the HTTPS server. Therefore use the same
1236 argument as when talking to the server directly. */
1237 && u->scheme != SCHEME_HTTPS
1240 meth_arg = xstrdup (u->url);
1242 meth_arg = url_full_path (u);
1243 request_set_method (req, meth, meth_arg);
1246 request_set_header (req, "Referer", (char *) hs->referer, rel_none);
1247 if (*dt & SEND_NOCACHE)
1248 request_set_header (req, "Pragma", "no-cache", rel_none);
1250 request_set_header (req, "Range",
1251 aprintf ("bytes=%s-",
1252 number_to_static_string (hs->restval)),
1254 SET_USER_AGENT (req);
1255 request_set_header (req, "Accept", "*/*", rel_none);
1257 /* Find the username and password for authentication. */
1260 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
1261 user = user ? user : (opt.http_user ? opt.http_user : opt.user);
1262 passwd = passwd ? passwd : (opt.http_passwd ? opt.http_passwd : opt.passwd);
1266 /* We have the username and the password, but haven't tried
1267 any authorization yet. Let's see if the "Basic" method
1268 works. If not, we'll come back here and construct a
1269 proper authorization method with the right challenges.
1271 If we didn't employ this kind of logic, every URL that
1272 requires authorization would have to be processed twice,
1273 which is very suboptimal and generates a bunch of false
1274 "unauthorized" errors in the server log.
1276 #### But this logic also has a serious problem when used
1277 with stronger authentications: we *first* transmit the
1278 username and the password in clear text, and *then* attempt a
1279 stronger authentication scheme. That cannot be right! We
1280 are only fortunate that almost everyone still uses the
1281 `Basic' scheme anyway.
1283 There should be an option to prevent this from happening, for
1284 those who use strong authentication schemes and value their
1286 request_set_header (req, "Authorization",
1287 basic_authentication_encode (user, passwd),
1294 char *proxy_user, *proxy_passwd;
1295 /* For normal username and password, URL components override
1296 command-line/wgetrc parameters. With proxy
1297 authentication, it's the reverse, because proxy URLs are
1298 normally the "permanent" ones, so command-line args
1299 should take precedence. */
1300 if (opt.proxy_user && opt.proxy_passwd)
1302 proxy_user = opt.proxy_user;
1303 proxy_passwd = opt.proxy_passwd;
1307 proxy_user = proxy->user;
1308 proxy_passwd = proxy->passwd;
1310 /* #### This does not appear right. Can't the proxy request,
1311 say, `Digest' authentication? */
1312 if (proxy_user && proxy_passwd)
1313 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd);
1315 /* If we're using a proxy, we will be connecting to the proxy
1319 /* Proxy authorization over SSL is handled below. */
1321 if (u->scheme != SCHEME_HTTPS)
1323 request_set_header (req, "Proxy-Authorization", proxyauth, rel_value);
1327 /* Whether we need to print the host header with braces around
1328 host, e.g. "Host: [3ffe:8100:200:2::2]:1234" instead of the
1329 usual "Host: symbolic-name:1234". */
1330 int squares = strchr (u->host, ':') != NULL;
1331 if (u->port == scheme_default_port (u->scheme))
1332 request_set_header (req, "Host",
1333 aprintf (squares ? "[%s]" : "%s", u->host),
1336 request_set_header (req, "Host",
1337 aprintf (squares ? "[%s]:%d" : "%s:%d",
1342 if (!inhibit_keep_alive)
1343 request_set_header (req, "Connection", "Keep-Alive", rel_none);
1346 request_set_header (req, "Cookie",
1347 cookie_header (wget_cookie_jar,
1348 u->host, u->port, u->path,
1350 u->scheme == SCHEME_HTTPS
1357 if (opt.post_data || opt.post_file_name)
1359 request_set_header (req, "Content-Type",
1360 "application/x-www-form-urlencoded", rel_none);
1362 post_data_size = strlen (opt.post_data);
1365 post_data_size = file_size (opt.post_file_name);
1366 if (post_data_size == -1)
1368 logprintf (LOG_NOTQUIET, _("POST data file missing: %s (%s)\n"),
1369 opt.post_file_name, strerror (errno));
1373 request_set_header (req, "Content-Length",
1374 xstrdup (number_to_static_string (post_data_size)),
1378 /* Add the user headers. */
1379 if (opt.user_headers)
1382 for (i = 0; opt.user_headers[i]; i++)
1383 request_set_user_header (req, opt.user_headers[i]);
1387 /* We need to come back here when the initial attempt to retrieve
1388 without authorization header fails. (Expected to happen at least
1389 for the Digest authorization scheme.) */
1393 /* Establish the connection. */
1395 if (!inhibit_keep_alive)
1397 /* Look for a persistent connection to target host, unless a
1398 proxy is used. The exception is when SSL is in use, in which
1399 case the proxy is nothing but a passthrough to the target
1400 host, registered as a connection to the latter. */
1401 struct url *relevant = conn;
1403 if (u->scheme == SCHEME_HTTPS)
1407 if (persistent_available_p (relevant->host, relevant->port,
1409 relevant->scheme == SCHEME_HTTPS,
1413 &host_lookup_failed))
1415 sock = pconn.socket;
1416 using_ssl = pconn.ssl;
1417 logprintf (LOG_VERBOSE, _("Reusing existing connection to %s:%d.\n"),
1418 escnonprint (pconn.host), pconn.port);
1419 DEBUGP (("Reusing fd %d.\n", sock));
1420 if (pconn.authorized)
1421 /* If the connection is already authorized, the "Basic"
1422 authorization added by code above is unnecessary and
1424 request_remove_header (req, "Authorization");
1430 /* In its current implementation, persistent_available_p will
1431 look up conn->host in some cases. If that lookup failed, we
1432 don't need to bother with connect_to_host. */
1433 if (host_lookup_failed)
1439 sock = connect_to_host (conn->host, conn->port);
1448 return (retryable_socket_connect_error (errno)
1449 ? CONERROR : CONIMPOSSIBLE);
1453 if (proxy && u->scheme == SCHEME_HTTPS)
1455 /* When requesting SSL URLs through proxies, use the
1456 CONNECT method to request passthrough. */
1457 struct request *connreq = request_new ();
1458 request_set_method (connreq, "CONNECT",
1459 aprintf ("%s:%d", u->host, u->port));
1460 SET_USER_AGENT (connreq);
1463 request_set_header (connreq, "Proxy-Authorization",
1464 proxyauth, rel_value);
1465 /* Now that PROXYAUTH is part of the CONNECT request,
1466 zero it out so we don't send proxy authorization with
1467 the regular request below. */
1470 /* Examples in rfc2817 use the Host header in CONNECT
1471 requests. I don't see how that gains anything, given
1472 that the contents of Host would be exactly the same as
1473 the contents of CONNECT. */
1475 write_error = request_send (connreq, sock);
1476 request_free (connreq);
1477 if (write_error < 0)
1479 logprintf (LOG_VERBOSE, _("Failed writing to proxy: %s.\n"),
1481 CLOSE_INVALIDATE (sock);
1485 head = read_http_response_head (sock);
1488 logprintf (LOG_VERBOSE, _("Failed reading proxy response: %s\n"),
1490 CLOSE_INVALIDATE (sock);
1499 DEBUGP (("proxy responded with: [%s]\n", head));
1501 resp = resp_new (head);
1502 statcode = resp_status (resp, &message);
1505 if (statcode != 200)
1508 logprintf (LOG_NOTQUIET, _("Proxy tunneling failed: %s"),
1509 message ? escnonprint (message) : "?");
1510 xfree_null (message);
1513 xfree_null (message);
1515 /* SOCK is now *really* connected to u->host, so update CONN
1516 to reflect this. That way register_persistent will
1517 register SOCK as being connected to u->host:u->port. */
1521 if (conn->scheme == SCHEME_HTTPS)
1523 if (!ssl_connect (sock) || !ssl_check_certificate (sock, u->host))
1530 #endif /* HAVE_SSL */
1533 /* Send the request to server. */
1534 write_error = request_send (req, sock);
1536 if (write_error >= 0)
1540 DEBUGP (("[POST data: %s]\n", opt.post_data));
1541 write_error = fd_write (sock, opt.post_data, post_data_size, -1.0);
1543 else if (opt.post_file_name && post_data_size != 0)
1544 write_error = post_file (sock, opt.post_file_name, post_data_size);
1547 if (write_error < 0)
1549 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
1551 CLOSE_INVALIDATE (sock);
1555 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1556 proxy ? "Proxy" : "HTTP");
1561 head = read_http_response_head (sock);
1566 logputs (LOG_NOTQUIET, _("No data received.\n"));
1567 CLOSE_INVALIDATE (sock);
1573 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1575 CLOSE_INVALIDATE (sock);
1580 DEBUGP (("\n---response begin---\n%s---response end---\n", head));
1582 resp = resp_new (head);
1584 /* Check for status line. */
1586 statcode = resp_status (resp, &message);
1587 if (!opt.server_response)
1588 logprintf (LOG_VERBOSE, "%2d %s\n", statcode,
1589 message ? escnonprint (message) : "");
1592 logprintf (LOG_VERBOSE, "\n");
1593 print_server_response (resp, " ");
1596 if (!opt.ignore_length
1597 && resp_header_copy (resp, "Content-Length", hdrval, sizeof (hdrval)))
1601 parsed = str_to_wgint (hdrval, NULL, 10);
1602 if (parsed == WGINT_MAX && errno == ERANGE)
1604 #### If Content-Length is out of range, it most likely
1605 means that the file is larger than 2G and that we're
1606 compiled without LFS. In that case we should probably
1607 refuse to even attempt to download the file. */
1613 /* Check for keep-alive related responses. */
1614 if (!inhibit_keep_alive && contlen != -1)
1616 if (resp_header_copy (resp, "Keep-Alive", NULL, 0))
1618 else if (resp_header_copy (resp, "Connection", hdrval, sizeof (hdrval)))
1620 if (0 == strcasecmp (hdrval, "Keep-Alive"))
1625 /* The server has promised that it will not close the connection
1626 when we're done. This means that we can register it. */
1627 register_persistent (conn->host, conn->port, sock, using_ssl);
1629 if (statcode == HTTP_STATUS_UNAUTHORIZED)
1631 /* Authorization is required. */
1632 if (keep_alive && !head_only && skip_short_body (sock, contlen))
1633 CLOSE_FINISH (sock);
1635 CLOSE_INVALIDATE (sock);
1636 pconn.authorized = 0;
1637 if (!auth_finished && (user && passwd))
1639 /* IIS sends multiple copies of WWW-Authenticate, one with
1640 the value "negotiate", and other(s) with data. Loop over
1641 all the occurrences and pick the one we recognize. */
1643 const char *wabeg, *waend;
1644 char *www_authenticate = NULL;
1646 (wapos = resp_header_locate (resp, "WWW-Authenticate", wapos,
1647 &wabeg, &waend)) != -1;
1649 if (known_authentication_scheme_p (wabeg, waend))
1651 BOUNDED_TO_ALLOCA (wabeg, waend, www_authenticate);
1655 if (!www_authenticate)
1656 /* If the authentication header is missing or
1657 unrecognized, there's no sense in retrying. */
1658 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1659 else if (BEGINS_WITH (www_authenticate, "Basic"))
1660 /* If the authentication scheme is "Basic", which we send
1661 by default, there's no sense in retrying either. (This
1662 should be changed when we stop sending "Basic" data by
1668 pth = url_full_path (u);
1669 request_set_header (req, "Authorization",
1670 create_authorization_line (www_authenticate,
1672 request_method (req),
1676 if (BEGINS_WITH (www_authenticate, "NTLM"))
1679 goto retry_with_auth;
1682 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1686 else /* statcode != HTTP_STATUS_UNAUTHORIZED */
1688 /* Kludge: if NTLM is used, mark the TCP connection as authorized. */
1690 pconn.authorized = 1;
1694 hs->statcode = statcode;
1696 hs->error = xstrdup (_("Malformed status line"));
1698 hs->error = xstrdup (_("(no description)"));
1700 hs->error = xstrdup (message);
1703 type = resp_header_strdup (resp, "Content-Type");
1706 char *tmp = strchr (type, ';');
1709 while (tmp > type && ISSPACE (tmp[-1]))
1714 hs->newloc = resp_header_strdup (resp, "Location");
1715 hs->remote_time = resp_header_strdup (resp, "Last-Modified");
1717 /* Handle (possibly multiple instances of) the Set-Cookie header. */
1721 const char *scbeg, *scend;
1722 /* The jar should have been created by now. */
1723 assert (wget_cookie_jar != NULL);
1725 (scpos = resp_header_locate (resp, "Set-Cookie", scpos,
1726 &scbeg, &scend)) != -1;
1729 char *set_cookie; BOUNDED_TO_ALLOCA (scbeg, scend, set_cookie);
1732 /* u->path doesn't begin with /, which cookies.c expects. */
1733 pth = (char *) alloca (1 + strlen (u->path) + 1);
1735 strcpy (pth + 1, u->path);
1737 cookie_handle_set_cookie (wget_cookie_jar, u->host, u->port, pth,
1742 if (resp_header_copy (resp, "Content-Range", hdrval, sizeof (hdrval)))
1744 wgint first_byte_pos, last_byte_pos, entity_length;
1745 if (parse_content_range (hdrval, &first_byte_pos, &last_byte_pos,
1747 contrange = first_byte_pos;
1752 /* 20x responses are counted among successful by default. */
1753 if (H_20X (statcode))
1756 /* Return if redirected. */
1757 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1759 /* RFC2068 says that in case of the 300 (multiple choices)
1760 response, the server can output a preferred URL through
1761 `Location' header; otherwise, the request should be treated
1762 like GET. So, if the location is set, it will be a
1763 redirection; otherwise, just proceed normally. */
1764 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1768 logprintf (LOG_VERBOSE,
1769 _("Location: %s%s\n"),
1770 hs->newloc ? escnonprint_uri (hs->newloc) : _("unspecified"),
1771 hs->newloc ? _(" [following]") : "");
1772 if (keep_alive && !head_only && skip_short_body (sock, contlen))
1773 CLOSE_FINISH (sock);
1775 CLOSE_INVALIDATE (sock);
1781 /* If content-type is not given, assume text/html. This is because
1782 of the multitude of broken CGI's that "forget" to generate the
1785 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) ||
1786 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S)))
1791 if (opt.html_extension && (*dt & TEXTHTML))
1792 /* -E / --html-extension / html_extension = on was specified, and this is a
1793 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1794 already the file's suffix, tack on ".html". */
1796 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1798 if (last_period_in_local_filename == NULL
1799 || !(0 == strcasecmp (last_period_in_local_filename, ".htm")
1800 || 0 == strcasecmp (last_period_in_local_filename, ".html")))
1802 size_t local_filename_len = strlen(*hs->local_file);
1804 *hs->local_file = xrealloc(*hs->local_file,
1805 local_filename_len + sizeof(".html"));
1806 strcpy(*hs->local_file + local_filename_len, ".html");
1808 *dt |= ADDED_HTML_EXTENSION;
1812 if (statcode == HTTP_STATUS_RANGE_NOT_SATISFIABLE)
1814 /* If `-c' is in use and the file has been fully downloaded (or
1815 the remote file has shrunk), Wget effectively requests bytes
1816 after the end of file and the server response with 416. */
1817 logputs (LOG_VERBOSE, _("\
1818 \n The file is already fully retrieved; nothing to do.\n\n"));
1819 /* In case the caller inspects. */
1822 /* Mark as successfully retrieved. */
1825 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1826 might be more bytes in the body. */
1827 return RETRUNNEEDED;
1829 if ((contrange != 0 && contrange != hs->restval)
1830 || (H_PARTIAL (statcode) && !contrange))
1832 /* The Range request was somehow misunderstood by the server.
1835 CLOSE_INVALIDATE (sock);
1838 hs->contlen = contlen + contrange;
1844 /* No need to print this output if the body won't be
1845 downloaded at all, or if the original server response is
1847 logputs (LOG_VERBOSE, _("Length: "));
1850 logputs (LOG_VERBOSE, with_thousand_seps (contlen + contrange));
1851 if (contlen + contrange >= 1024)
1852 logprintf (LOG_VERBOSE, " (%s)",
1853 human_readable (contlen + contrange));
1856 if (contlen >= 1024)
1857 logprintf (LOG_VERBOSE, _(", %s (%s) remaining"),
1858 with_thousand_seps (contlen),
1859 human_readable (contlen));
1861 logprintf (LOG_VERBOSE, _(", %s remaining"),
1862 with_thousand_seps (contlen));
1866 logputs (LOG_VERBOSE,
1867 opt.ignore_length ? _("ignored") : _("unspecified"));
1869 logprintf (LOG_VERBOSE, " [%s]\n", escnonprint (type));
1871 logputs (LOG_VERBOSE, "\n");
1875 type = NULL; /* We don't need it any more. */
1877 /* Return if we have no intention of further downloading. */
1878 if (!(*dt & RETROKF) || head_only)
1880 /* In case the caller cares to look... */
1884 /* Pre-1.10 Wget used CLOSE_INVALIDATE here. Now we trust the
1885 servers not to send body in response to a HEAD request. If
1886 you encounter such a server (more likely a broken CGI), use
1887 `--no-http-keep-alive'. */
1888 CLOSE_FINISH (sock);
1889 return RETRFINISHED;
1892 /* Open the local file. */
1895 mkalldirs (*hs->local_file);
1897 rotate_backups (*hs->local_file);
1899 fp = fopen (*hs->local_file, "ab");
1900 else if (opt.noclobber || opt.always_rest || opt.timestamping || opt.dirstruct
1901 || opt.output_document)
1902 fp = fopen (*hs->local_file, "wb");
1905 fp = fopen_excl (*hs->local_file, 1);
1906 if (!fp && errno == EEXIST)
1908 /* We cannot just invent a new name and use it (which is
1909 what functions like unique_create typically do)
1910 because we told the user we'd use this name.
1911 Instead, return and retry the download. */
1912 logprintf (LOG_NOTQUIET,
1913 _("%s has sprung into existence.\n"),
1915 CLOSE_INVALIDATE (sock);
1916 return FOPEN_EXCL_ERR;
1921 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1922 CLOSE_INVALIDATE (sock);
1929 /* #### This confuses the timestamping code that checks for file
1930 size. Maybe we should save some additional information? */
1931 if (opt.save_headers)
1932 fwrite (head, 1, strlen (head), fp);
1934 /* Download the request body. */
1937 flags |= rb_read_exactly;
1938 if (hs->restval > 0 && contrange == 0)
1939 /* If the server ignored our range request, instruct fd_read_body
1940 to skip the first RESTVAL bytes of body. */
1941 flags |= rb_skip_startpos;
1942 hs->len = hs->restval;
1944 hs->res = fd_read_body (sock, fp, contlen != -1 ? contlen : 0,
1945 hs->restval, &hs->rd_size, &hs->len, &hs->dltime,
1949 CLOSE_FINISH (sock);
1951 CLOSE_INVALIDATE (sock);
1954 /* Close or flush the file. We have to be careful to check for
1955 error here. Checking the result of fwrite() is not enough --
1956 errors could go unnoticed! */
1959 flush_res = fclose (fp);
1961 flush_res = fflush (fp);
1962 if (flush_res == EOF)
1967 return RETRFINISHED;
1970 /* The genuine HTTP loop! This is the part where the retrieval is
1971 retried, and retried, and retried, and... */
1973 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1974 int *dt, struct url *proxy)
1977 int use_ts, got_head = 0; /* time-stamping info */
1978 char *filename_plus_orig_suffix;
1979 char *local_filename = NULL;
1980 char *tms, *locf, *tmrate;
1982 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1983 wgint local_size = 0; /* the size of the local file */
1984 size_t filename_len;
1985 struct http_stat hstat; /* HTTP status */
1989 /* This used to be done in main(), but it's a better idea to do it
1990 here so that we don't go through the hoops if we're just using
1994 if (!wget_cookie_jar)
1995 wget_cookie_jar = cookie_jar_new ();
1996 if (opt.cookies_input && !cookies_loaded_p)
1998 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
1999 cookies_loaded_p = 1;
2005 /* Warn on (likely bogus) wildcard usage in HTTP. */
2006 if (has_wildcards_p (u->path))
2007 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
2011 /* Determine the local filename. */
2012 if (local_file && *local_file)
2013 hstat.local_file = local_file;
2014 else if (local_file && !opt.output_document)
2016 *local_file = url_file_name (u);
2017 hstat.local_file = local_file;
2021 dummy = url_file_name (u);
2022 hstat.local_file = &dummy;
2023 /* be honest about where we will save the file */
2024 if (local_file && opt.output_document)
2025 *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document);
2028 if (!opt.output_document)
2029 locf = *hstat.local_file;
2031 locf = opt.output_document;
2033 hstat.referer = referer;
2035 filename_len = strlen (*hstat.local_file);
2036 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
2038 if (opt.noclobber && file_exists_p (*hstat.local_file))
2040 /* If opt.noclobber is turned on and file already exists, do not
2041 retrieve the file */
2042 logprintf (LOG_VERBOSE, _("\
2043 File `%s' already there; not retrieving.\n\n"), *hstat.local_file);
2044 /* If the file is there, we suppose it's retrieved OK. */
2047 /* #### Bogusness alert. */
2048 /* If its suffix is "html" or "htm" or similar, assume text/html. */
2049 if (has_html_suffix_p (*hstat.local_file))
2057 if (opt.timestamping)
2059 int local_dot_orig_file_exists = 0;
2061 if (opt.backup_converted)
2062 /* If -K is specified, we'll act on the assumption that it was specified
2063 last time these files were downloaded as well, and instead of just
2064 comparing local file X against server file X, we'll compare local
2065 file X.orig (if extant, else X) against server file X. If -K
2066 _wasn't_ specified last time, or the server contains files called
2067 *.orig, -N will be back to not operating correctly with -k. */
2069 /* Would a single s[n]printf() call be faster? --dan
2071 Definitely not. sprintf() is horribly slow. It's a
2072 different question whether the difference between the two
2073 affects a program. Usually I'd say "no", but at one
2074 point I profiled Wget, and found that a measurable and
2075 non-negligible amount of time was lost calling sprintf()
2076 in url.c. Replacing sprintf with inline calls to
2077 strcpy() and number_to_string() made a difference.
2079 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
2080 memcpy (filename_plus_orig_suffix + filename_len,
2081 ".orig", sizeof (".orig"));
2083 /* Try to stat() the .orig file. */
2084 if (stat (filename_plus_orig_suffix, &st) == 0)
2086 local_dot_orig_file_exists = 1;
2087 local_filename = filename_plus_orig_suffix;
2091 if (!local_dot_orig_file_exists)
2092 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
2093 if (stat (*hstat.local_file, &st) == 0)
2094 local_filename = *hstat.local_file;
2096 if (local_filename != NULL)
2097 /* There was a local file, so we'll check later to see if the version
2098 the server has is the same version we already have, allowing us to
2104 /* Modification time granularity is 2 seconds for Windows, so
2105 increase local time by 1 second for later comparison. */
2108 local_size = st.st_size;
2112 /* Reset the counter. */
2118 /* Increment the pass counter. */
2120 sleep_between_retrievals (count);
2121 /* Get the current time string. */
2122 tms = time_str (NULL);
2123 /* Print fetch message, if opt.verbose. */
2126 char *hurl = url_string (u, 1);
2130 sprintf (tmp, _("(try:%2d)"), count);
2131 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
2132 tms, hurl, tmp, locf);
2134 ws_changetitle (hurl);
2139 /* Default document type is empty. However, if spider mode is
2140 on or time-stamping is employed, HEAD_ONLY commands is
2141 encoded within *dt. */
2142 if (opt.spider || (use_ts && !got_head))
2147 /* Decide whether or not to restart. */
2149 && stat (locf, &st) == 0
2150 && S_ISREG (st.st_mode))
2151 /* When -c is used, continue from on-disk size. (Can't use
2152 hstat.len even if count>1 because we don't want a failed
2153 first attempt to clobber existing data.) */
2154 hstat.restval = st.st_size;
2156 /* otherwise, continue where the previous try left off */
2157 hstat.restval = hstat.len;
2161 /* Decide whether to send the no-cache directive. We send it in
2163 a) we're using a proxy, and we're past our first retrieval.
2164 Some proxies are notorious for caching incomplete data, so
2165 we require a fresh get.
2166 b) caching is explicitly inhibited. */
2167 if ((proxy && count > 1) /* a */
2168 || !opt.allow_cache /* b */
2170 *dt |= SEND_NOCACHE;
2172 *dt &= ~SEND_NOCACHE;
2174 /* Try fetching the document, or at least its head. */
2175 err = gethttp (u, &hstat, dt, proxy);
2177 /* It's unfortunate that wget determines the local filename before finding
2178 out the Content-Type of the file. Barring a major restructuring of the
2179 code, we need to re-set locf here, since gethttp() may have xrealloc()d
2180 *hstat.local_file to tack on ".html". */
2181 if (!opt.output_document)
2182 locf = *hstat.local_file;
2185 tms = time_str (NULL);
2186 /* Get the new location (with or without the redirection). */
2188 *newloc = xstrdup (hstat.newloc);
2191 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
2192 case CONERROR: case READERR: case WRITEFAILED:
2193 case RANGEERR: case FOPEN_EXCL_ERR:
2194 /* Non-fatal errors continue executing the loop, which will
2195 bring them to "while" statement at the end, to judge
2196 whether the number of tries was exceeded. */
2197 free_hstat (&hstat);
2198 printwhat (count, opt.ntry);
2199 if (err == FOPEN_EXCL_ERR)
2201 /* Re-determine the file name. */
2202 if (local_file && *local_file)
2204 xfree (*local_file);
2205 *local_file = url_file_name (u);
2206 hstat.local_file = local_file;
2211 dummy = url_file_name (u);
2212 hstat.local_file = &dummy;
2214 /* be honest about where we will save the file */
2215 if (local_file && opt.output_document)
2216 *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document);
2217 if (!opt.output_document)
2218 locf = *hstat.local_file;
2220 locf = opt.output_document;
2223 case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED:
2224 case SSLINITFAILED: case CONTNOTSUPPORTED:
2225 /* Fatal errors just return from the function. */
2226 free_hstat (&hstat);
2229 case FWRITEERR: case FOPENERR:
2230 /* Another fatal error. */
2231 logputs (LOG_VERBOSE, "\n");
2232 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
2233 *hstat.local_file, strerror (errno));
2234 free_hstat (&hstat);
2238 /* Another fatal error. */
2239 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
2240 free_hstat (&hstat);
2244 /* Return the new location to the caller. */
2247 logprintf (LOG_NOTQUIET,
2248 _("ERROR: Redirection (%d) without location.\n"),
2250 free_hstat (&hstat);
2254 free_hstat (&hstat);
2258 /* The file was already fully retrieved. */
2259 free_hstat (&hstat);
2263 /* Deal with you later. */
2266 /* All possibilities should have been exhausted. */
2269 if (!(*dt & RETROKF))
2273 /* #### Ugly ugly ugly! */
2274 char *hurl = url_string (u, 1);
2275 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
2278 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
2279 tms, hstat.statcode, escnonprint (hstat.error));
2280 logputs (LOG_VERBOSE, "\n");
2281 free_hstat (&hstat);
2286 /* Did we get the time-stamp? */
2289 if (opt.timestamping && !hstat.remote_time)
2291 logputs (LOG_NOTQUIET, _("\
2292 Last-modified header missing -- time-stamps turned off.\n"));
2294 else if (hstat.remote_time)
2296 /* Convert the date-string into struct tm. */
2297 tmr = http_atotm (hstat.remote_time);
2298 if (tmr == (time_t) (-1))
2299 logputs (LOG_VERBOSE, _("\
2300 Last-modified header invalid -- time-stamp ignored.\n"));
2304 /* The time-stamping section. */
2309 use_ts = 0; /* no more time-stamping */
2310 count = 0; /* the retrieve count for HEAD is
2312 if (hstat.remote_time && tmr != (time_t) (-1))
2314 /* Now time-stamping can be used validly. Time-stamping
2315 means that if the sizes of the local and remote file
2316 match, and local file is newer than the remote file,
2317 it will not be retrieved. Otherwise, the normal
2318 download procedure is resumed. */
2320 (hstat.contlen == -1 || local_size == hstat.contlen))
2322 logprintf (LOG_VERBOSE, _("\
2323 Server file no newer than local file `%s' -- not retrieving.\n\n"),
2325 free_hstat (&hstat);
2329 else if (tml >= tmr)
2330 logprintf (LOG_VERBOSE, _("\
2331 The sizes do not match (local %s) -- retrieving.\n"),
2332 number_to_static_string (local_size));
2334 logputs (LOG_VERBOSE,
2335 _("Remote file is newer, retrieving.\n"));
2337 free_hstat (&hstat);
2340 if ((tmr != (time_t) (-1))
2342 && ((hstat.len == hstat.contlen) ||
2343 ((hstat.res == 0) &&
2344 ((hstat.contlen == -1) ||
2345 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
2347 /* #### This code repeats in http.c and ftp.c. Move it to a
2349 const char *fl = NULL;
2350 if (opt.output_document)
2352 if (output_stream_regular)
2353 fl = opt.output_document;
2356 fl = *hstat.local_file;
2360 /* End of time-stamping section. */
2364 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode,
2365 escnonprint (hstat.error));
2370 tmrate = retr_rate (hstat.rd_size, hstat.dltime, 0);
2372 if (hstat.len == hstat.contlen)
2376 logprintf (LOG_VERBOSE,
2377 _("%s (%s) - `%s' saved [%s/%s]\n\n"),
2379 number_to_static_string (hstat.len),
2380 number_to_static_string (hstat.contlen));
2381 logprintf (LOG_NONVERBOSE,
2382 "%s URL:%s [%s/%s] -> \"%s\" [%d]\n",
2384 number_to_static_string (hstat.len),
2385 number_to_static_string (hstat.contlen),
2389 total_downloaded_bytes += hstat.len;
2391 /* Remember that we downloaded the file for later ".orig" code. */
2392 if (*dt & ADDED_HTML_EXTENSION)
2393 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2395 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2397 free_hstat (&hstat);
2401 else if (hstat.res == 0) /* No read error */
2403 if (hstat.contlen == -1) /* We don't know how much we were supposed
2404 to get, so assume we succeeded. */
2408 logprintf (LOG_VERBOSE,
2409 _("%s (%s) - `%s' saved [%s]\n\n"),
2411 number_to_static_string (hstat.len));
2412 logprintf (LOG_NONVERBOSE,
2413 "%s URL:%s [%s] -> \"%s\" [%d]\n",
2414 tms, u->url, number_to_static_string (hstat.len),
2418 total_downloaded_bytes += hstat.len;
2420 /* Remember that we downloaded the file for later ".orig" code. */
2421 if (*dt & ADDED_HTML_EXTENSION)
2422 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2424 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2426 free_hstat (&hstat);
2430 else if (hstat.len < hstat.contlen) /* meaning we lost the
2431 connection too soon */
2433 logprintf (LOG_VERBOSE,
2434 _("%s (%s) - Connection closed at byte %s. "),
2435 tms, tmrate, number_to_static_string (hstat.len));
2436 printwhat (count, opt.ntry);
2437 free_hstat (&hstat);
2440 else if (!opt.kill_longer) /* meaning we got more than expected */
2442 logprintf (LOG_VERBOSE,
2443 _("%s (%s) - `%s' saved [%s/%s]\n\n"),
2445 number_to_static_string (hstat.len),
2446 number_to_static_string (hstat.contlen));
2447 logprintf (LOG_NONVERBOSE,
2448 "%s URL:%s [%s/%s] -> \"%s\" [%d]\n",
2450 number_to_static_string (hstat.len),
2451 number_to_static_string (hstat.contlen),
2454 total_downloaded_bytes += hstat.len;
2456 /* Remember that we downloaded the file for later ".orig" code. */
2457 if (*dt & ADDED_HTML_EXTENSION)
2458 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2460 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2462 free_hstat (&hstat);
2466 else /* the same, but not accepted */
2468 logprintf (LOG_VERBOSE,
2469 _("%s (%s) - Connection closed at byte %s/%s. "),
2471 number_to_static_string (hstat.len),
2472 number_to_static_string (hstat.contlen));
2473 printwhat (count, opt.ntry);
2474 free_hstat (&hstat);
2478 else /* now hstat.res can only be -1 */
2480 if (hstat.contlen == -1)
2482 logprintf (LOG_VERBOSE,
2483 _("%s (%s) - Read error at byte %s (%s)."),
2484 tms, tmrate, number_to_static_string (hstat.len),
2486 printwhat (count, opt.ntry);
2487 free_hstat (&hstat);
2490 else /* hstat.res == -1 and contlen is given */
2492 logprintf (LOG_VERBOSE,
2493 _("%s (%s) - Read error at byte %s/%s (%s). "),
2495 number_to_static_string (hstat.len),
2496 number_to_static_string (hstat.contlen),
2498 printwhat (count, opt.ntry);
2499 free_hstat (&hstat);
2505 while (!opt.ntry || (count < opt.ntry));
2509 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
2510 than local timezone.
2512 mktime is similar but assumes struct tm, also known as the
2513 "broken-down" form of time, is in local time zone. mktime_from_utc
2514 uses mktime to make the conversion understanding that an offset
2515 will be introduced by the local time assumption.
2517 mktime_from_utc then measures the introduced offset by applying
2518 gmtime to the initial result and applying mktime to the resulting
2519 "broken-down" form. The difference between the two mktime results
2520 is the measured offset which is then subtracted from the initial
2521 mktime result to yield a calendar time which is the value returned.
2523 tm_isdst in struct tm is set to 0 to force mktime to introduce a
2524 consistent offset (the non DST offset) since tm and tm+o might be
2525 on opposite sides of a DST change.
2527 Some implementations of mktime return -1 for the nonexistent
2528 localtime hour at the beginning of DST. In this event, use
2529 mktime(tm - 1hr) + 3600.
2533 gmtime(t+o) --> tm+o
2534 mktime(tm+o) --> t+2o
2535 t+o - (t+2o - t+o) = t
2537 Note that glibc contains a function of the same purpose named
2538 `timegm' (reverse of gmtime). But obviously, it is not universally
2539 available, and unfortunately it is not straightforwardly
2540 extractable for use here. Perhaps configure should detect timegm
2541 and use it where available.
2543 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
2544 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
2545 Further improved by Roger with assistance from Edward J. Sabol
2546 based on input by Jamie Zawinski. */
2549 mktime_from_utc (struct tm *t)
2560 return -1; /* can't deal with output from strptime */
2571 return -1; /* can't deal with output from gmtime */
2574 return (tl - (tb - tl));
2577 /* Check whether the result of strptime() indicates success.
2578 strptime() returns the pointer to how far it got to in the string.
2579 The processing has been successful if the string is at `GMT' or
2580 `+X', or at the end of the string.
2582 In extended regexp parlance, the function returns 1 if P matches
2583 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2584 can return) is considered a failure and 0 is returned. */
2586 check_end (const char *p)
2590 while (ISSPACE (*p))
2593 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2594 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
2600 /* Convert the textual specification of time in TIME_STRING to the
2601 number of seconds since the Epoch.
2603 TIME_STRING can be in any of the three formats RFC2616 allows the
2604 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date,
2605 as well as the time format used in the Set-Cookie header.
2606 Timezones are ignored, and should be GMT.
2608 Return the computed time_t representation, or -1 if the conversion
2611 This function uses strptime with various string formats for parsing
2612 TIME_STRING. This results in a parser that is not as lenient in
2613 interpreting TIME_STRING as I would like it to be. Being based on
2614 strptime, it always allows shortened months, one-digit days, etc.,
2615 but due to the multitude of formats in which time can be
2616 represented, an ideal HTTP time parser would be even more
2617 forgiving. It should completely ignore things like week days and
2618 concentrate only on the various forms of representing years,
2619 months, days, hours, minutes, and seconds. For example, it would
2620 be nice if it accepted ISO 8601 out of the box.
2622 I've investigated free and PD code for this purpose, but none was
2623 usable. getdate was big and unwieldy, and had potential copyright
2624 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2625 distributed with phttpd, is excellent, but we cannot use it because
2626 it is not assigned to the FSF. So I stuck it with strptime. */
2629 http_atotm (const char *time_string)
2631 /* NOTE: Solaris strptime man page claims that %n and %t match white
2632 space, but that's not universally available. Instead, we simply
2633 use ` ' to mean "skip all WS", which works under all strptime
2634 implementations I've tested. */
2636 static const char *time_formats[] = {
2637 "%a, %d %b %Y %T", /* rfc1123: Thu, 29 Jan 1998 22:12:57 */
2638 "%A, %d-%b-%y %T", /* rfc850: Thursday, 29-Jan-98 22:12:57 */
2639 "%a %b %d %T %Y", /* asctime: Thu Jan 29 22:12:57 1998 */
2640 "%a, %d-%b-%Y %T" /* cookies: Thu, 29-Jan-1998 22:12:57
2641 (used in Set-Cookie, defined in the
2642 Netscape cookie specification.) */
2646 for (i = 0; i < countof (time_formats); i++)
2650 /* Some versions of strptime use the existing contents of struct
2651 tm to recalculate the date according to format. Zero it out
2652 to prevent garbage from the stack influencing strptime. */
2655 /* Solaris strptime fails to recognize English month names in
2656 non-English locales, which we work around by not setting the
2657 LC_TIME category. Another way would be to temporarily set
2658 locale to C before invoking strptime, but that's slow and
2659 messy. GNU strptime does not have this problem because it
2660 recognizes English month names along with the local ones. */
2662 if (check_end (strptime (time_string, time_formats[i], &t)))
2663 return mktime_from_utc (&t);
2666 /* All formats have failed. */
2670 /* Authorization support: We support three authorization schemes:
2672 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2674 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2675 consisting of answering to the server's challenge with the proper
2678 * `NTLM' ("NT Lan Manager") scheme, based on code written by Daniel
2679 Stenberg for libcurl. Like digest, NTLM is based on a
2680 challenge-response mechanism, but unlike digest, it is non-standard
2681 (authenticates TCP connections rather than requests), undocumented
2682 and Microsoft-specific. */
2684 /* Create the authentication header contents for the `Basic' scheme.
2685 This is done by encoding the string "USER:PASS" to base64 and
2686 prepending the string "Basic " in front of it. */
2689 basic_authentication_encode (const char *user, const char *passwd)
2692 int len1 = strlen (user) + 1 + strlen (passwd);
2694 t1 = (char *)alloca (len1 + 1);
2695 sprintf (t1, "%s:%s", user, passwd);
2697 t2 = (char *)alloca (BASE64_LENGTH (len1) + 1);
2698 base64_encode (t1, len1, t2);
2700 return concat_strings ("Basic ", t2, (char *) 0);
2703 #define SKIP_WS(x) do { \
2704 while (ISSPACE (*(x))) \
2708 #ifdef ENABLE_DIGEST
2709 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2710 of a field in such a header. If the field is the one specified by
2711 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2712 digest authorization code), extract its value in the (char*)
2713 variable pointed by RET. Returns negative on a malformed header,
2714 or number of bytes that have been parsed by this call. */
2716 extract_header_attr (const char *au, const char *attr_name, char **ret)
2719 const char *cp = au;
2721 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2723 cp += strlen (attr_name);
2736 for (ep = cp; *ep && *ep != '\"'; ep++)
2741 *ret = strdupdelim (cp, ep);
2748 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2749 an array of 16 bytes containing the hash keys, and BUF should be a
2750 buffer of 33 writable characters (32 for hex digits plus one for
2751 zero termination). */
2753 dump_hash (unsigned char *buf, const unsigned char *hash)
2757 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2759 *buf++ = XNUM_TO_digit (*hash >> 4);
2760 *buf++ = XNUM_TO_digit (*hash & 0xf);
2765 /* Take the line apart to find the challenge, and compose a digest
2766 authorization header. See RFC2069 section 2.1.2. */
2768 digest_authentication_encode (const char *au, const char *user,
2769 const char *passwd, const char *method,
2772 static char *realm, *opaque, *nonce;
2777 { "realm", &realm },
2778 { "opaque", &opaque },
2783 realm = opaque = nonce = NULL;
2785 au += 6; /* skip over `Digest' */
2791 for (i = 0; i < countof (options); i++)
2793 int skip = extract_header_attr (au, options[i].name,
2794 options[i].variable);
2798 xfree_null (opaque);
2808 if (i == countof (options))
2810 while (*au && *au != '=')
2818 while (*au && *au != '\"')
2825 while (*au && *au != ',')
2830 if (!realm || !nonce || !user || !passwd || !path || !method)
2833 xfree_null (opaque);
2838 /* Calculate the digest value. */
2840 ALLOCA_MD5_CONTEXT (ctx);
2841 unsigned char hash[MD5_HASHLEN];
2842 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2843 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2845 /* A1BUF = H(user ":" realm ":" password) */
2847 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2848 gen_md5_update ((unsigned char *)":", 1, ctx);
2849 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2850 gen_md5_update ((unsigned char *)":", 1, ctx);
2851 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2852 gen_md5_finish (ctx, hash);
2853 dump_hash (a1buf, hash);
2855 /* A2BUF = H(method ":" path) */
2857 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2858 gen_md5_update ((unsigned char *)":", 1, ctx);
2859 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2860 gen_md5_finish (ctx, hash);
2861 dump_hash (a2buf, hash);
2863 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2865 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2866 gen_md5_update ((unsigned char *)":", 1, ctx);
2867 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2868 gen_md5_update ((unsigned char *)":", 1, ctx);
2869 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2870 gen_md5_finish (ctx, hash);
2871 dump_hash (response_digest, hash);
2873 res = (char*) xmalloc (strlen (user)
2878 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2879 + (opaque ? strlen (opaque) : 0)
2881 sprintf (res, "Digest \
2882 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2883 user, realm, nonce, path, response_digest);
2886 char *p = res + strlen (res);
2887 strcat (p, ", opaque=\"");
2894 #endif /* ENABLE_DIGEST */
2896 /* Computing the size of a string literal must take into account that
2897 value returned by sizeof includes the terminating \0. */
2898 #define STRSIZE(literal) (sizeof (literal) - 1)
2900 /* Whether chars in [b, e) begin with the literal string provided as
2901 first argument and are followed by whitespace or terminating \0.
2902 The comparison is case-insensitive. */
2903 #define STARTS(literal, b, e) \
2904 ((e) - (b) >= STRSIZE (literal) \
2905 && 0 == strncasecmp (b, literal, STRSIZE (literal)) \
2906 && ((e) - (b) == STRSIZE (literal) \
2907 || ISSPACE (b[STRSIZE (literal)])))
2910 known_authentication_scheme_p (const char *hdrbeg, const char *hdrend)
2912 return STARTS ("Basic", hdrbeg, hdrend)
2913 #ifdef ENABLE_DIGEST
2914 || STARTS ("Digest", hdrbeg, hdrend)
2917 || STARTS ("NTLM", hdrbeg, hdrend)
2924 /* Create the HTTP authorization request header. When the
2925 `WWW-Authenticate' response header is seen, according to the
2926 authorization scheme specified in that header (`Basic' and `Digest'
2927 are supported by the current implementation), produce an
2928 appropriate HTTP authorization request header. */
2930 create_authorization_line (const char *au, const char *user,
2931 const char *passwd, const char *method,
2932 const char *path, int *finished)
2934 /* We are called only with known schemes, so we can dispatch on the
2936 switch (TOUPPER (*au))
2938 case 'B': /* Basic */
2940 return basic_authentication_encode (user, passwd);
2941 #ifdef ENABLE_DIGEST
2942 case 'D': /* Digest */
2944 return digest_authentication_encode (au, user, passwd, method, path);
2947 case 'N': /* NTLM */
2948 if (!ntlm_input (&pconn.ntlm, au))
2953 return ntlm_output (&pconn.ntlm, user, passwd, finished);
2956 /* We shouldn't get here -- this function should be only called
2957 with values approved by known_authentication_scheme_p. */
2965 if (wget_cookie_jar)
2966 cookie_jar_save (wget_cookie_jar, opt.cookies_output);
2972 xfree_null (pconn.host);
2973 if (wget_cookie_jar)
2974 cookie_jar_delete (wget_cookie_jar);