2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GNU Wget.
7 GNU Wget is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 GNU Wget is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Wget. If not, see <http://www.gnu.org/licenses/>.
20 Additional permission under GNU GPL version 3 section 7
22 If you modify this program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a
24 modified version of that library), containing parts covered by the
25 terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
26 grants you additional permission to convey the resulting work.
27 Corresponding Source for a non-source form of such a combination
28 shall include the source code for the parts of OpenSSL used as well
29 as that of the covered work. */
56 # include "http-ntlm.h"
69 extern char *version_string;
72 static char *create_authorization_line (const char *, const char *,
73 const char *, const char *,
74 const char *, bool *);
75 static char *basic_authentication_encode (const char *, const char *);
76 static bool known_authentication_scheme_p (const char *, const char *);
77 static void load_cookies (void);
80 # define MIN(x, y) ((x) > (y) ? (y) : (x))
84 static bool cookies_loaded_p;
85 static struct cookie_jar *wget_cookie_jar;
87 #define TEXTHTML_S "text/html"
88 #define TEXTXHTML_S "application/xhtml+xml"
90 /* Some status code validation macros: */
91 #define H_20X(x) (((x) >= 200) && ((x) < 300))
92 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
93 #define H_REDIRECTED(x) ((x) == HTTP_STATUS_MOVED_PERMANENTLY \
94 || (x) == HTTP_STATUS_MOVED_TEMPORARILY \
95 || (x) == HTTP_STATUS_SEE_OTHER \
96 || (x) == HTTP_STATUS_TEMPORARY_REDIRECT)
98 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
100 #define HTTP_STATUS_OK 200
101 #define HTTP_STATUS_CREATED 201
102 #define HTTP_STATUS_ACCEPTED 202
103 #define HTTP_STATUS_NO_CONTENT 204
104 #define HTTP_STATUS_PARTIAL_CONTENTS 206
106 /* Redirection 3xx. */
107 #define HTTP_STATUS_MULTIPLE_CHOICES 300
108 #define HTTP_STATUS_MOVED_PERMANENTLY 301
109 #define HTTP_STATUS_MOVED_TEMPORARILY 302
110 #define HTTP_STATUS_SEE_OTHER 303 /* from HTTP/1.1 */
111 #define HTTP_STATUS_NOT_MODIFIED 304
112 #define HTTP_STATUS_TEMPORARY_REDIRECT 307 /* from HTTP/1.1 */
114 /* Client error 4xx. */
115 #define HTTP_STATUS_BAD_REQUEST 400
116 #define HTTP_STATUS_UNAUTHORIZED 401
117 #define HTTP_STATUS_FORBIDDEN 403
118 #define HTTP_STATUS_NOT_FOUND 404
119 #define HTTP_STATUS_RANGE_NOT_SATISFIABLE 416
121 /* Server errors 5xx. */
122 #define HTTP_STATUS_INTERNAL 500
123 #define HTTP_STATUS_NOT_IMPLEMENTED 501
124 #define HTTP_STATUS_BAD_GATEWAY 502
125 #define HTTP_STATUS_UNAVAILABLE 503
128 rel_none, rel_name, rel_value, rel_both
135 struct request_header {
137 enum rp release_policy;
139 int hcount, hcapacity;
142 /* Create a new, empty request. At least request_set_method must be
143 called before the request can be used. */
145 static struct request *
148 struct request *req = xnew0 (struct request);
150 req->headers = xnew_array (struct request_header, req->hcapacity);
154 /* Set the request's method and its arguments. METH should be a
155 literal string (or it should outlive the request) because it will
156 not be freed. ARG will be freed by request_free. */
159 request_set_method (struct request *req, const char *meth, char *arg)
165 /* Return the method string passed with the last call to
166 request_set_method. */
169 request_method (const struct request *req)
174 /* Free one header according to the release policy specified with
175 request_set_header. */
178 release_header (struct request_header *hdr)
180 switch (hdr->release_policy)
197 /* Set the request named NAME to VALUE. Specifically, this means that
198 a "NAME: VALUE\r\n" header line will be used in the request. If a
199 header with the same name previously existed in the request, its
200 value will be replaced by this one. A NULL value means do nothing.
202 RELEASE_POLICY determines whether NAME and VALUE should be released
203 (freed) with request_free. Allowed values are:
205 - rel_none - don't free NAME or VALUE
206 - rel_name - free NAME when done
207 - rel_value - free VALUE when done
208 - rel_both - free both NAME and VALUE when done
210 Setting release policy is useful when arguments come from different
211 sources. For example:
213 // Don't free literal strings!
214 request_set_header (req, "Pragma", "no-cache", rel_none);
216 // Don't free a global variable, we'll need it later.
217 request_set_header (req, "Referer", opt.referer, rel_none);
219 // Value freshly allocated, free it when done.
220 request_set_header (req, "Range",
221 aprintf ("bytes=%s-", number_to_static_string (hs->restval)),
226 request_set_header (struct request *req, char *name, char *value,
227 enum rp release_policy)
229 struct request_header *hdr;
234 /* A NULL value is a no-op; if freeing the name is requested,
235 free it now to avoid leaks. */
236 if (release_policy == rel_name || release_policy == rel_both)
241 for (i = 0; i < req->hcount; i++)
243 hdr = &req->headers[i];
244 if (0 == strcasecmp (name, hdr->name))
246 /* Replace existing header. */
247 release_header (hdr);
250 hdr->release_policy = release_policy;
255 /* Install new header. */
257 if (req->hcount >= req->hcapacity)
259 req->hcapacity <<= 1;
260 req->headers = xrealloc (req->headers, req->hcapacity * sizeof (*hdr));
262 hdr = &req->headers[req->hcount++];
265 hdr->release_policy = release_policy;
268 /* Like request_set_header, but sets the whole header line, as
269 provided by the user using the `--header' option. For example,
270 request_set_user_header (req, "Foo: bar") works just like
271 request_set_header (req, "Foo", "bar"). */
274 request_set_user_header (struct request *req, const char *header)
277 const char *p = strchr (header, ':');
280 BOUNDED_TO_ALLOCA (header, p, name);
282 while (c_isspace (*p))
284 request_set_header (req, xstrdup (name), (char *) p, rel_name);
287 /* Remove the header with specified name from REQ. Returns true if
288 the header was actually removed, false otherwise. */
291 request_remove_header (struct request *req, char *name)
294 for (i = 0; i < req->hcount; i++)
296 struct request_header *hdr = &req->headers[i];
297 if (0 == strcasecmp (name, hdr->name))
299 release_header (hdr);
300 /* Move the remaining headers by one. */
301 if (i < req->hcount - 1)
302 memmove (hdr, hdr + 1, (req->hcount - i - 1) * sizeof (*hdr));
310 #define APPEND(p, str) do { \
311 int A_len = strlen (str); \
312 memcpy (p, str, A_len); \
316 /* Construct the request and write it to FD using fd_write. */
319 request_send (const struct request *req, int fd)
321 char *request_string, *p;
322 int i, size, write_error;
324 /* Count the request size. */
327 /* METHOD " " ARG " " "HTTP/1.0" "\r\n" */
328 size += strlen (req->method) + 1 + strlen (req->arg) + 1 + 8 + 2;
330 for (i = 0; i < req->hcount; i++)
332 struct request_header *hdr = &req->headers[i];
333 /* NAME ": " VALUE "\r\n" */
334 size += strlen (hdr->name) + 2 + strlen (hdr->value) + 2;
340 p = request_string = alloca_array (char, size);
342 /* Generate the request. */
344 APPEND (p, req->method); *p++ = ' ';
345 APPEND (p, req->arg); *p++ = ' ';
346 memcpy (p, "HTTP/1.0\r\n", 10); p += 10;
348 for (i = 0; i < req->hcount; i++)
350 struct request_header *hdr = &req->headers[i];
351 APPEND (p, hdr->name);
352 *p++ = ':', *p++ = ' ';
353 APPEND (p, hdr->value);
354 *p++ = '\r', *p++ = '\n';
357 *p++ = '\r', *p++ = '\n', *p++ = '\0';
358 assert (p - request_string == size);
362 DEBUGP (("\n---request begin---\n%s---request end---\n", request_string));
364 /* Send the request to the server. */
366 write_error = fd_write (fd, request_string, size - 1, -1);
368 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
373 /* Release the resources used by REQ. */
376 request_free (struct request *req)
379 xfree_null (req->arg);
380 for (i = 0; i < req->hcount; i++)
381 release_header (&req->headers[i]);
382 xfree_null (req->headers);
386 static struct hash_table *basic_authed_hosts;
388 /* Find out if this host has issued a Basic challenge yet; if so, give
389 * it the username, password. A temporary measure until we can get
390 * proper authentication in place. */
393 maybe_send_basic_creds (const char *hostname, const char *user,
394 const char *passwd, struct request *req)
396 int did_challenge = 0;
398 if (basic_authed_hosts
399 && hash_table_contains(basic_authed_hosts, hostname))
401 DEBUGP(("Found `%s' in basic_authed_hosts.\n", hostname));
402 request_set_header (req, "Authorization",
403 basic_authentication_encode (user, passwd),
409 DEBUGP(("Host `%s' has not issued a general basic challenge.\n",
412 return did_challenge;
416 register_basic_auth_host (const char *hostname)
418 if (!basic_authed_hosts)
420 basic_authed_hosts = make_nocase_string_hash_table (1);
422 if (!hash_table_contains(basic_authed_hosts, hostname))
424 hash_table_put (basic_authed_hosts, xstrdup(hostname), NULL);
425 DEBUGP(("Inserted `%s' into basic_authed_hosts\n", hostname));
430 /* Send the contents of FILE_NAME to SOCK. Make sure that exactly
431 PROMISED_SIZE bytes are sent over the wire -- if the file is
432 longer, read only that much; if the file is shorter, report an error. */
435 post_file (int sock, const char *file_name, wgint promised_size)
437 static char chunk[8192];
442 DEBUGP (("[writing POST file %s ... ", file_name));
444 fp = fopen (file_name, "rb");
447 while (!feof (fp) && written < promised_size)
450 int length = fread (chunk, 1, sizeof (chunk), fp);
453 towrite = MIN (promised_size - written, length);
454 write_error = fd_write (sock, chunk, towrite, -1);
464 /* If we've written less than was promised, report a (probably
465 nonsensical) error rather than break the promise. */
466 if (written < promised_size)
472 assert (written == promised_size);
473 DEBUGP (("done]\n"));
477 /* Determine whether [START, PEEKED + PEEKLEN) contains an empty line.
478 If so, return the pointer to the position after the line, otherwise
479 return NULL. This is used as callback to fd_read_hunk. The data
480 between START and PEEKED has been read and cannot be "unread"; the
481 data after PEEKED has only been peeked. */
484 response_head_terminator (const char *start, const char *peeked, int peeklen)
488 /* If at first peek, verify whether HUNK starts with "HTTP". If
489 not, this is a HTTP/0.9 request and we must bail out without
491 if (start == peeked && 0 != memcmp (start, "HTTP", MIN (peeklen, 4)))
494 /* Look for "\n[\r]\n", and return the following position if found.
495 Start two chars before the current to cover the possibility that
496 part of the terminator (e.g. "\n\r") arrived in the previous
498 p = peeked - start < 2 ? start : peeked - 2;
499 end = peeked + peeklen;
501 /* Check for \n\r\n or \n\n anywhere in [p, end-2). */
502 for (; p < end - 2; p++)
505 if (p[1] == '\r' && p[2] == '\n')
507 else if (p[1] == '\n')
510 /* p==end-2: check for \n\n directly preceding END. */
511 if (p[0] == '\n' && p[1] == '\n')
517 /* The maximum size of a single HTTP response we care to read. Rather
518 than being a limit of the reader implementation, this limit
519 prevents Wget from slurping all available memory upon encountering
520 malicious or buggy server output, thus protecting the user. Define
521 it to 0 to remove the limit. */
523 #define HTTP_RESPONSE_MAX_SIZE 65536
525 /* Read the HTTP request head from FD and return it. The error
526 conditions are the same as with fd_read_hunk.
528 To support HTTP/0.9 responses, this function tries to make sure
529 that the data begins with "HTTP". If this is not the case, no data
530 is read and an empty request is returned, so that the remaining
531 data can be treated as body. */
534 read_http_response_head (int fd)
536 return fd_read_hunk (fd, response_head_terminator, 512,
537 HTTP_RESPONSE_MAX_SIZE);
541 /* The response data. */
544 /* The array of pointers that indicate where each header starts.
545 For example, given this HTTP response:
552 The headers are located like this:
554 "HTTP/1.0 200 Ok\r\nDescription: some\r\n text\r\nEtag: x\r\n\r\n"
556 headers[0] headers[1] headers[2] headers[3]
558 I.e. headers[0] points to the beginning of the request,
559 headers[1] points to the end of the first header and the
560 beginning of the second one, etc. */
562 const char **headers;
565 /* Create a new response object from the text of the HTTP response,
566 available in HEAD. That text is automatically split into
567 constituent header lines for fast retrieval using
570 static struct response *
571 resp_new (const char *head)
576 struct response *resp = xnew0 (struct response);
581 /* Empty head means that we're dealing with a headerless
582 (HTTP/0.9) response. In that case, don't set HEADERS at
587 /* Split HEAD into header lines, so that resp_header_* functions
588 don't need to do this over and over again. */
594 DO_REALLOC (resp->headers, size, count + 1, const char *);
595 resp->headers[count++] = hdr;
597 /* Break upon encountering an empty line. */
598 if (!hdr[0] || (hdr[0] == '\r' && hdr[1] == '\n') || hdr[0] == '\n')
601 /* Find the end of HDR, including continuations. */
604 const char *end = strchr (hdr, '\n');
610 while (*hdr == ' ' || *hdr == '\t');
612 DO_REALLOC (resp->headers, size, count + 1, const char *);
613 resp->headers[count] = NULL;
618 /* Locate the header named NAME in the request data, starting with
619 position START. This allows the code to loop through the request
620 data, filtering for all requests of a given name. Returns the
621 found position, or -1 for failure. The code that uses this
622 function typically looks like this:
624 for (pos = 0; (pos = resp_header_locate (...)) != -1; pos++)
625 ... do something with header ...
627 If you only care about one header, use resp_header_get instead of
631 resp_header_locate (const struct response *resp, const char *name, int start,
632 const char **begptr, const char **endptr)
635 const char **headers = resp->headers;
638 if (!headers || !headers[1])
641 name_len = strlen (name);
647 for (; headers[i + 1]; i++)
649 const char *b = headers[i];
650 const char *e = headers[i + 1];
652 && b[name_len] == ':'
653 && 0 == strncasecmp (b, name, name_len))
656 while (b < e && c_isspace (*b))
658 while (b < e && c_isspace (e[-1]))
668 /* Find and retrieve the header named NAME in the request data. If
669 found, set *BEGPTR to its starting, and *ENDPTR to its ending
670 position, and return true. Otherwise return false.
672 This function is used as a building block for resp_header_copy
673 and resp_header_strdup. */
676 resp_header_get (const struct response *resp, const char *name,
677 const char **begptr, const char **endptr)
679 int pos = resp_header_locate (resp, name, 0, begptr, endptr);
683 /* Copy the response header named NAME to buffer BUF, no longer than
684 BUFSIZE (BUFSIZE includes the terminating 0). If the header
685 exists, true is returned, false otherwise. If there should be no
686 limit on the size of the header, use resp_header_strdup instead.
688 If BUFSIZE is 0, no data is copied, but the boolean indication of
689 whether the header is present is still returned. */
692 resp_header_copy (const struct response *resp, const char *name,
693 char *buf, int bufsize)
696 if (!resp_header_get (resp, name, &b, &e))
700 int len = MIN (e - b, bufsize - 1);
701 memcpy (buf, b, len);
707 /* Return the value of header named NAME in RESP, allocated with
708 malloc. If such a header does not exist in RESP, return NULL. */
711 resp_header_strdup (const struct response *resp, const char *name)
714 if (!resp_header_get (resp, name, &b, &e))
716 return strdupdelim (b, e);
719 /* Parse the HTTP status line, which is of format:
721 HTTP-Version SP Status-Code SP Reason-Phrase
723 The function returns the status-code, or -1 if the status line
724 appears malformed. The pointer to "reason-phrase" message is
725 returned in *MESSAGE. */
728 resp_status (const struct response *resp, char **message)
735 /* For a HTTP/0.9 response, assume status 200. */
737 *message = xstrdup (_("No headers, assuming HTTP/0.9"));
741 p = resp->headers[0];
742 end = resp->headers[1];
748 if (end - p < 4 || 0 != strncmp (p, "HTTP", 4))
752 /* Match the HTTP version. This is optional because Gnutella
753 servers have been reported to not specify HTTP version. */
754 if (p < end && *p == '/')
757 while (p < end && c_isdigit (*p))
759 if (p < end && *p == '.')
761 while (p < end && c_isdigit (*p))
765 while (p < end && c_isspace (*p))
767 if (end - p < 3 || !c_isdigit (p[0]) || !c_isdigit (p[1]) || !c_isdigit (p[2]))
770 status = 100 * (p[0] - '0') + 10 * (p[1] - '0') + (p[2] - '0');
775 while (p < end && c_isspace (*p))
777 while (p < end && c_isspace (end[-1]))
779 *message = strdupdelim (p, end);
785 /* Release the resources used by RESP. */
788 resp_free (struct response *resp)
790 xfree_null (resp->headers);
794 /* Print a single line of response, the characters [b, e). We tried
796 logprintf (LOG_VERBOSE, "%s%.*s\n", prefix, (int) (e - b), b);
797 but that failed to escape the non-printable characters and, in fact,
798 caused crashes in UTF-8 locales. */
801 print_response_line(const char *prefix, const char *b, const char *e)
804 BOUNDED_TO_ALLOCA(b, e, copy);
805 logprintf (LOG_VERBOSE, "%s%s\n", prefix, escnonprint(copy));
808 /* Print the server response, line by line, omitting the trailing CRLF
809 from individual header lines, and prefixed with PREFIX. */
812 print_server_response (const struct response *resp, const char *prefix)
817 for (i = 0; resp->headers[i + 1]; i++)
819 const char *b = resp->headers[i];
820 const char *e = resp->headers[i + 1];
822 if (b < e && e[-1] == '\n')
824 if (b < e && e[-1] == '\r')
826 print_response_line(prefix, b, e);
830 /* Parse the `Content-Range' header and extract the information it
831 contains. Returns true if successful, false otherwise. */
833 parse_content_range (const char *hdr, wgint *first_byte_ptr,
834 wgint *last_byte_ptr, wgint *entity_length_ptr)
838 /* Ancient versions of Netscape proxy server, presumably predating
839 rfc2068, sent out `Content-Range' without the "bytes"
841 if (0 == strncasecmp (hdr, "bytes", 5))
844 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
848 while (c_isspace (*hdr))
853 if (!c_isdigit (*hdr))
855 for (num = 0; c_isdigit (*hdr); hdr++)
856 num = 10 * num + (*hdr - '0');
857 if (*hdr != '-' || !c_isdigit (*(hdr + 1)))
859 *first_byte_ptr = num;
861 for (num = 0; c_isdigit (*hdr); hdr++)
862 num = 10 * num + (*hdr - '0');
863 if (*hdr != '/' || !c_isdigit (*(hdr + 1)))
865 *last_byte_ptr = num;
870 for (num = 0; c_isdigit (*hdr); hdr++)
871 num = 10 * num + (*hdr - '0');
872 *entity_length_ptr = num;
876 /* Read the body of the request, but don't store it anywhere and don't
877 display a progress gauge. This is useful for reading the bodies of
878 administrative responses to which we will soon issue another
879 request. The response is not useful to the user, but reading it
880 allows us to continue using the same connection to the server.
882 If reading fails, false is returned, true otherwise. In debug
883 mode, the body is displayed for debugging purposes. */
886 skip_short_body (int fd, wgint contlen)
889 SKIP_SIZE = 512, /* size of the download buffer */
890 SKIP_THRESHOLD = 4096 /* the largest size we read */
892 char dlbuf[SKIP_SIZE + 1];
893 dlbuf[SKIP_SIZE] = '\0'; /* so DEBUGP can safely print it */
895 /* We shouldn't get here with unknown contlen. (This will change
896 with HTTP/1.1, which supports "chunked" transfer.) */
897 assert (contlen != -1);
899 /* If the body is too large, it makes more sense to simply close the
900 connection than to try to read the body. */
901 if (contlen > SKIP_THRESHOLD)
904 DEBUGP (("Skipping %s bytes of body: [", number_to_static_string (contlen)));
908 int ret = fd_read (fd, dlbuf, MIN (contlen, SKIP_SIZE), -1);
911 /* Don't normally report the error since this is an
912 optimization that should be invisible to the user. */
913 DEBUGP (("] aborting (%s).\n",
914 ret < 0 ? fd_errstr (fd) : "EOF received"));
918 /* Safe even if %.*s bogusly expects terminating \0 because
919 we've zero-terminated dlbuf above. */
920 DEBUGP (("%.*s", ret, dlbuf));
923 DEBUGP (("] done.\n"));
927 /* Extract a parameter from the string (typically an HTTP header) at
928 **SOURCE and advance SOURCE to the next parameter. Return false
929 when there are no more parameters to extract. The name of the
930 parameter is returned in NAME, and the value in VALUE. If the
931 parameter has no value, the token's value is zeroed out.
933 For example, if *SOURCE points to the string "attachment;
934 filename=\"foo bar\"", the first call to this function will return
935 the token named "attachment" and no value, and the second call will
936 return the token named "filename" and value "foo bar". The third
937 call will return false, indicating no more valid tokens. */
940 extract_param (const char **source, param_token *name, param_token *value,
943 const char *p = *source;
945 while (c_isspace (*p)) ++p;
949 return false; /* no error; nothing more to extract */
954 while (*p && !c_isspace (*p) && *p != '=' && *p != separator) ++p;
956 if (name->b == name->e)
957 return false; /* empty name: error */
958 while (c_isspace (*p)) ++p;
959 if (*p == separator || !*p) /* no value */
962 if (*p == separator) ++p;
967 return false; /* error */
969 /* *p is '=', extract value */
971 while (c_isspace (*p)) ++p;
972 if (*p == '"') /* quoted */
975 while (*p && *p != '"') ++p;
979 /* Currently at closing quote; find the end of param. */
980 while (c_isspace (*p)) ++p;
981 while (*p && *p != separator) ++p;
985 /* garbage after closed quote, e.g. foo="bar"baz */
991 while (*p && *p != separator) ++p;
993 while (value->e != value->b && c_isspace (value->e[-1]))
995 if (*p == separator) ++p;
1002 #define MAX(p, q) ((p) > (q) ? (p) : (q))
1004 /* Parse the contents of the `Content-Disposition' header, extracting
1005 the information useful to Wget. Content-Disposition is a header
1006 borrowed from MIME; when used in HTTP, it typically serves for
1007 specifying the desired file name of the resource. For example:
1009 Content-Disposition: attachment; filename="flora.jpg"
1011 Wget will skip the tokens it doesn't care about, such as
1012 "attachment" in the previous example; it will also skip other
1013 unrecognized params. If the header is syntactically correct and
1014 contains a file name, a copy of the file name is stored in
1015 *filename and true is returned. Otherwise, the function returns
1018 The file name is stripped of directory components and must not be
1022 parse_content_disposition (const char *hdr, char **filename)
1024 param_token name, value;
1025 while (extract_param (&hdr, &name, &value, ';'))
1026 if (BOUNDED_EQUAL_NO_CASE (name.b, name.e, "filename") && value.b != NULL)
1028 /* Make the file name begin at the last slash or backslash. */
1029 const char *last_slash = memrchr (value.b, '/', value.e - value.b);
1030 const char *last_bs = memrchr (value.b, '\\', value.e - value.b);
1031 if (last_slash && last_bs)
1032 value.b = 1 + MAX (last_slash, last_bs);
1033 else if (last_slash || last_bs)
1034 value.b = 1 + (last_slash ? last_slash : last_bs);
1035 if (value.b == value.e)
1037 /* Start with the directory prefix, if specified. */
1040 int prefix_length = strlen (opt.dir_prefix);
1041 bool add_slash = (opt.dir_prefix[prefix_length - 1] != '/');
1046 total_length = prefix_length + (value.e - value.b);
1047 *filename = xmalloc (total_length + 1);
1048 strcpy (*filename, opt.dir_prefix);
1050 (*filename)[prefix_length - 1] = '/';
1051 memcpy (*filename + prefix_length, value.b, (value.e - value.b));
1052 (*filename)[total_length] = '\0';
1055 *filename = strdupdelim (value.b, value.e);
1061 /* Persistent connections. Currently, we cache the most recently used
1062 connection as persistent, provided that the HTTP server agrees to
1063 make it such. The persistence data is stored in the variables
1064 below. Ideally, it should be possible to cache an arbitrary fixed
1065 number of these connections. */
1067 /* Whether a persistent connection is active. */
1068 static bool pconn_active;
1071 /* The socket of the connection. */
1074 /* Host and port of the currently active persistent connection. */
1078 /* Whether a ssl handshake has occoured on this connection. */
1081 /* Whether the connection was authorized. This is only done by
1082 NTLM, which authorizes *connections* rather than individual
1083 requests. (That practice is peculiar for HTTP, but it is a
1084 useful optimization.) */
1088 /* NTLM data of the current connection. */
1089 struct ntlmdata ntlm;
1093 /* Mark the persistent connection as invalid and free the resources it
1094 uses. This is used by the CLOSE_* macros after they forcefully
1095 close a registered persistent connection. */
1098 invalidate_persistent (void)
1100 DEBUGP (("Disabling further reuse of socket %d.\n", pconn.socket));
1101 pconn_active = false;
1102 fd_close (pconn.socket);
1107 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
1108 persistent. This will enable someone to use the same connection
1109 later. In the context of HTTP, this must be called only AFTER the
1110 response has been received and the server has promised that the
1111 connection will remain alive.
1113 If a previous connection was persistent, it is closed. */
1116 register_persistent (const char *host, int port, int fd, bool ssl)
1120 if (pconn.socket == fd)
1122 /* The connection FD is already registered. */
1127 /* The old persistent connection is still active; close it
1128 first. This situation arises whenever a persistent
1129 connection exists, but we then connect to a different
1130 host, and try to register a persistent connection to that
1132 invalidate_persistent ();
1136 pconn_active = true;
1138 pconn.host = xstrdup (host);
1141 pconn.authorized = false;
1143 DEBUGP (("Registered socket %d for persistent reuse.\n", fd));
1146 /* Return true if a persistent connection is available for connecting
1150 persistent_available_p (const char *host, int port, bool ssl,
1151 bool *host_lookup_failed)
1153 /* First, check whether a persistent connection is active at all. */
1157 /* If we want SSL and the last connection wasn't or vice versa,
1158 don't use it. Checking for host and port is not enough because
1159 HTTP and HTTPS can apparently coexist on the same port. */
1160 if (ssl != pconn.ssl)
1163 /* If we're not connecting to the same port, we're not interested. */
1164 if (port != pconn.port)
1167 /* If the host is the same, we're in business. If not, there is
1168 still hope -- read below. */
1169 if (0 != strcasecmp (host, pconn.host))
1171 /* Check if pconn.socket is talking to HOST under another name.
1172 This happens often when both sites are virtual hosts
1173 distinguished only by name and served by the same network
1174 interface, and hence the same web server (possibly set up by
1175 the ISP and serving many different web sites). This
1176 admittedly unconventional optimization does not contradict
1177 HTTP and works well with popular server software. */
1181 struct address_list *al;
1184 /* Don't try to talk to two different SSL sites over the same
1185 secure connection! (Besides, it's not clear that
1186 name-based virtual hosting is even possible with SSL.) */
1189 /* If pconn.socket's peer is one of the IP addresses HOST
1190 resolves to, pconn.socket is for all intents and purposes
1191 already talking to HOST. */
1193 if (!socket_ip_address (pconn.socket, &ip, ENDPOINT_PEER))
1195 /* Can't get the peer's address -- something must be very
1196 wrong with the connection. */
1197 invalidate_persistent ();
1200 al = lookup_host (host, 0);
1203 *host_lookup_failed = true;
1207 found = address_list_contains (al, &ip);
1208 address_list_release (al);
1213 /* The persistent connection's peer address was found among the
1214 addresses HOST resolved to; therefore, pconn.sock is in fact
1215 already talking to HOST -- no need to reconnect. */
1218 /* Finally, check whether the connection is still open. This is
1219 important because most servers implement liberal (short) timeout
1220 on persistent connections. Wget can of course always reconnect
1221 if the connection doesn't work out, but it's nicer to know in
1222 advance. This test is a logical followup of the first test, but
1223 is "expensive" and therefore placed at the end of the list.
1225 (Current implementation of test_socket_open has a nice side
1226 effect that it treats sockets with pending data as "closed".
1227 This is exactly what we want: if a broken server sends message
1228 body in response to HEAD, or if it sends more than conent-length
1229 data, we won't reuse the corrupted connection.) */
1231 if (!test_socket_open (pconn.socket))
1233 /* Oops, the socket is no longer open. Now that we know that,
1234 let's invalidate the persistent connection before returning
1236 invalidate_persistent ();
1243 /* The idea behind these two CLOSE macros is to distinguish between
1244 two cases: one when the job we've been doing is finished, and we
1245 want to close the connection and leave, and two when something is
1246 seriously wrong and we're closing the connection as part of
1249 In case of keep_alive, CLOSE_FINISH should leave the connection
1250 open, while CLOSE_INVALIDATE should still close it.
1252 Note that the semantics of the flag `keep_alive' is "this
1253 connection *will* be reused (the server has promised not to close
1254 the connection once we're done)", while the semantics of
1255 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
1256 active, registered connection". */
1258 #define CLOSE_FINISH(fd) do { \
1261 if (pconn_active && (fd) == pconn.socket) \
1262 invalidate_persistent (); \
1271 #define CLOSE_INVALIDATE(fd) do { \
1272 if (pconn_active && (fd) == pconn.socket) \
1273 invalidate_persistent (); \
1281 wgint len; /* received length */
1282 wgint contlen; /* expected length */
1283 wgint restval; /* the restart value */
1284 int res; /* the result of last read */
1285 char *rderrmsg; /* error message from read error */
1286 char *newloc; /* new location (redirection) */
1287 char *remote_time; /* remote time-stamp string */
1288 char *error; /* textual HTTP error */
1289 int statcode; /* status code */
1290 wgint rd_size; /* amount of data read from socket */
1291 double dltime; /* time it took to download the data */
1292 const char *referer; /* value of the referer header. */
1293 char *local_file; /* local file name. */
1294 bool timestamp_checked; /* true if pre-download time-stamping checks
1295 * have already been performed */
1296 char *orig_file_name; /* name of file to compare for time-stamping
1297 * (might be != local_file if -K is set) */
1298 wgint orig_file_size; /* size of file to compare for time-stamping */
1299 time_t orig_file_tstamp; /* time-stamp of file to compare for
1304 free_hstat (struct http_stat *hs)
1306 xfree_null (hs->newloc);
1307 xfree_null (hs->remote_time);
1308 xfree_null (hs->error);
1309 xfree_null (hs->rderrmsg);
1310 xfree_null (hs->local_file);
1311 xfree_null (hs->orig_file_name);
1313 /* Guard against being called twice. */
1315 hs->remote_time = NULL;
1319 #define BEGINS_WITH(line, string_constant) \
1320 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1321 && (c_isspace (line[sizeof (string_constant) - 1]) \
1322 || !line[sizeof (string_constant) - 1]))
1324 #define SET_USER_AGENT(req) do { \
1325 if (!opt.useragent) \
1326 request_set_header (req, "User-Agent", \
1327 aprintf ("Wget/%s", version_string), rel_value); \
1328 else if (*opt.useragent) \
1329 request_set_header (req, "User-Agent", opt.useragent, rel_none); \
1332 /* The flags that allow clobbering the file (opening with "wb").
1333 Defined here to avoid repetition later. #### This will require
1335 #define ALLOW_CLOBBER (opt.noclobber || opt.always_rest || opt.timestamping \
1336 || opt.dirstruct || opt.output_document)
1338 /* Retrieve a document through HTTP protocol. It recognizes status
1339 code, and correctly handles redirections. It closes the network
1340 socket. If it receives an error from the functions below it, it
1341 will print it if there is enough information to do so (almost
1342 always), returning the error to the caller (i.e. http_loop).
1344 Various HTTP parameters are stored to hs.
1346 If PROXY is non-NULL, the connection will be made to the proxy
1347 server, and u->url will be requested. */
1349 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
1351 struct request *req;
1354 char *user, *passwd;
1358 wgint contlen, contrange;
1365 /* Set to 1 when the authorization has already been sent and should
1366 not be tried again. */
1367 bool auth_finished = false;
1369 /* Set to 1 when just globally-set Basic authorization has been sent;
1370 * should prevent further Basic negotiations, but not other
1372 bool basic_auth_finished = false;
1374 /* Whether NTLM authentication is used for this request. */
1375 bool ntlm_seen = false;
1377 /* Whether our connection to the remote host is through SSL. */
1378 bool using_ssl = false;
1380 /* Whether a HEAD request will be issued (as opposed to GET or
1382 bool head_only = !!(*dt & HEAD_ONLY);
1385 struct response *resp;
1389 /* Whether this connection will be kept alive after the HTTP request
1393 /* Whether keep-alive should be inhibited.
1395 RFC 2068 requests that 1.0 clients not send keep-alive requests
1396 to proxies. This is because many 1.0 proxies do not interpret
1397 the Connection header and transfer it to the remote server,
1398 causing it to not close the connection and leave both the proxy
1399 and the client hanging. */
1400 bool inhibit_keep_alive =
1401 !opt.http_keep_alive || opt.ignore_length || proxy != NULL;
1403 /* Headers sent when using POST. */
1404 wgint post_data_size = 0;
1406 bool host_lookup_failed = false;
1409 if (u->scheme == SCHEME_HTTPS)
1411 /* Initialize the SSL context. After this has once been done,
1412 it becomes a no-op. */
1415 scheme_disable (SCHEME_HTTPS);
1416 logprintf (LOG_NOTQUIET,
1417 _("Disabling SSL due to encountered errors.\n"));
1418 return SSLINITFAILED;
1421 #endif /* HAVE_SSL */
1423 /* Initialize certain elements of struct http_stat. */
1427 hs->rderrmsg = NULL;
1429 hs->remote_time = NULL;
1434 /* Prepare the request to send. */
1436 req = request_new ();
1439 const char *meth = "GET";
1442 else if (opt.post_file_name || opt.post_data)
1444 /* Use the full path, i.e. one that includes the leading slash and
1445 the query string. E.g. if u->path is "foo/bar" and u->query is
1446 "param=value", full_path will be "/foo/bar?param=value". */
1449 /* When using SSL over proxy, CONNECT establishes a direct
1450 connection to the HTTPS server. Therefore use the same
1451 argument as when talking to the server directly. */
1452 && u->scheme != SCHEME_HTTPS
1455 meth_arg = xstrdup (u->url);
1457 meth_arg = url_full_path (u);
1458 request_set_method (req, meth, meth_arg);
1461 request_set_header (req, "Referer", (char *) hs->referer, rel_none);
1462 if (*dt & SEND_NOCACHE)
1463 request_set_header (req, "Pragma", "no-cache", rel_none);
1465 request_set_header (req, "Range",
1466 aprintf ("bytes=%s-",
1467 number_to_static_string (hs->restval)),
1469 SET_USER_AGENT (req);
1470 request_set_header (req, "Accept", "*/*", rel_none);
1472 /* Find the username and password for authentication. */
1475 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
1476 user = user ? user : (opt.http_user ? opt.http_user : opt.user);
1477 passwd = passwd ? passwd : (opt.http_passwd ? opt.http_passwd : opt.passwd);
1480 && !u->user) /* We only do "site-wide" authentication with "global"
1481 user/password values; URL user/password info overrides. */
1483 /* If this is a host for which we've already received a Basic
1484 * challenge, we'll go ahead and send Basic authentication creds. */
1485 basic_auth_finished = maybe_send_basic_creds(u->host, user, passwd, req);
1491 char *proxy_user, *proxy_passwd;
1492 /* For normal username and password, URL components override
1493 command-line/wgetrc parameters. With proxy
1494 authentication, it's the reverse, because proxy URLs are
1495 normally the "permanent" ones, so command-line args
1496 should take precedence. */
1497 if (opt.proxy_user && opt.proxy_passwd)
1499 proxy_user = opt.proxy_user;
1500 proxy_passwd = opt.proxy_passwd;
1504 proxy_user = proxy->user;
1505 proxy_passwd = proxy->passwd;
1507 /* #### This does not appear right. Can't the proxy request,
1508 say, `Digest' authentication? */
1509 if (proxy_user && proxy_passwd)
1510 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd);
1512 /* If we're using a proxy, we will be connecting to the proxy
1516 /* Proxy authorization over SSL is handled below. */
1518 if (u->scheme != SCHEME_HTTPS)
1520 request_set_header (req, "Proxy-Authorization", proxyauth, rel_value);
1523 /* Generate the Host header, HOST:PORT. Take into account that:
1525 - Broken server-side software often doesn't recognize the PORT
1526 argument, so we must generate "Host: www.server.com" instead of
1527 "Host: www.server.com:80" (and likewise for https port).
1529 - IPv6 addresses contain ":", so "Host: 3ffe:8100:200:2::2:1234"
1530 becomes ambiguous and needs to be rewritten as "Host:
1531 [3ffe:8100:200:2::2]:1234". */
1533 /* Formats arranged for hfmt[add_port][add_squares]. */
1534 static const char *hfmt[][2] = {
1535 { "%s", "[%s]" }, { "%s:%d", "[%s]:%d" }
1537 int add_port = u->port != scheme_default_port (u->scheme);
1538 int add_squares = strchr (u->host, ':') != NULL;
1539 request_set_header (req, "Host",
1540 aprintf (hfmt[add_port][add_squares], u->host, u->port),
1544 if (!inhibit_keep_alive)
1545 request_set_header (req, "Connection", "Keep-Alive", rel_none);
1548 request_set_header (req, "Cookie",
1549 cookie_header (wget_cookie_jar,
1550 u->host, u->port, u->path,
1552 u->scheme == SCHEME_HTTPS
1559 if (opt.post_data || opt.post_file_name)
1561 request_set_header (req, "Content-Type",
1562 "application/x-www-form-urlencoded", rel_none);
1564 post_data_size = strlen (opt.post_data);
1567 post_data_size = file_size (opt.post_file_name);
1568 if (post_data_size == -1)
1570 logprintf (LOG_NOTQUIET, _("POST data file `%s' missing: %s\n"),
1571 opt.post_file_name, strerror (errno));
1575 request_set_header (req, "Content-Length",
1576 xstrdup (number_to_static_string (post_data_size)),
1580 /* Add the user headers. */
1581 if (opt.user_headers)
1584 for (i = 0; opt.user_headers[i]; i++)
1585 request_set_user_header (req, opt.user_headers[i]);
1589 /* We need to come back here when the initial attempt to retrieve
1590 without authorization header fails. (Expected to happen at least
1591 for the Digest authorization scheme.) */
1595 /* Establish the connection. */
1597 if (!inhibit_keep_alive)
1599 /* Look for a persistent connection to target host, unless a
1600 proxy is used. The exception is when SSL is in use, in which
1601 case the proxy is nothing but a passthrough to the target
1602 host, registered as a connection to the latter. */
1603 struct url *relevant = conn;
1605 if (u->scheme == SCHEME_HTTPS)
1609 if (persistent_available_p (relevant->host, relevant->port,
1611 relevant->scheme == SCHEME_HTTPS,
1615 &host_lookup_failed))
1617 sock = pconn.socket;
1618 using_ssl = pconn.ssl;
1619 logprintf (LOG_VERBOSE, _("Reusing existing connection to %s:%d.\n"),
1620 escnonprint (pconn.host), pconn.port);
1621 DEBUGP (("Reusing fd %d.\n", sock));
1622 if (pconn.authorized)
1623 /* If the connection is already authorized, the "Basic"
1624 authorization added by code above is unnecessary and
1626 request_remove_header (req, "Authorization");
1628 else if (host_lookup_failed)
1631 logprintf(LOG_NOTQUIET,
1632 _("%s: unable to resolve host address `%s'\n"),
1633 exec_name, relevant->host);
1640 sock = connect_to_host (conn->host, conn->port);
1649 return (retryable_socket_connect_error (errno)
1650 ? CONERROR : CONIMPOSSIBLE);
1654 if (proxy && u->scheme == SCHEME_HTTPS)
1656 /* When requesting SSL URLs through proxies, use the
1657 CONNECT method to request passthrough. */
1658 struct request *connreq = request_new ();
1659 request_set_method (connreq, "CONNECT",
1660 aprintf ("%s:%d", u->host, u->port));
1661 SET_USER_AGENT (connreq);
1664 request_set_header (connreq, "Proxy-Authorization",
1665 proxyauth, rel_value);
1666 /* Now that PROXYAUTH is part of the CONNECT request,
1667 zero it out so we don't send proxy authorization with
1668 the regular request below. */
1671 /* Examples in rfc2817 use the Host header in CONNECT
1672 requests. I don't see how that gains anything, given
1673 that the contents of Host would be exactly the same as
1674 the contents of CONNECT. */
1676 write_error = request_send (connreq, sock);
1677 request_free (connreq);
1678 if (write_error < 0)
1680 CLOSE_INVALIDATE (sock);
1684 head = read_http_response_head (sock);
1687 logprintf (LOG_VERBOSE, _("Failed reading proxy response: %s\n"),
1689 CLOSE_INVALIDATE (sock);
1698 DEBUGP (("proxy responded with: [%s]\n", head));
1700 resp = resp_new (head);
1701 statcode = resp_status (resp, &message);
1704 if (statcode != 200)
1707 logprintf (LOG_NOTQUIET, _("Proxy tunneling failed: %s"),
1708 message ? escnonprint (message) : "?");
1709 xfree_null (message);
1712 xfree_null (message);
1714 /* SOCK is now *really* connected to u->host, so update CONN
1715 to reflect this. That way register_persistent will
1716 register SOCK as being connected to u->host:u->port. */
1720 if (conn->scheme == SCHEME_HTTPS)
1722 if (!ssl_connect (sock) || !ssl_check_certificate (sock, u->host))
1729 #endif /* HAVE_SSL */
1732 /* Send the request to server. */
1733 write_error = request_send (req, sock);
1735 if (write_error >= 0)
1739 DEBUGP (("[POST data: %s]\n", opt.post_data));
1740 write_error = fd_write (sock, opt.post_data, post_data_size, -1);
1742 else if (opt.post_file_name && post_data_size != 0)
1743 write_error = post_file (sock, opt.post_file_name, post_data_size);
1746 if (write_error < 0)
1748 CLOSE_INVALIDATE (sock);
1752 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1753 proxy ? "Proxy" : "HTTP");
1758 head = read_http_response_head (sock);
1763 logputs (LOG_NOTQUIET, _("No data received.\n"));
1764 CLOSE_INVALIDATE (sock);
1770 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1772 CLOSE_INVALIDATE (sock);
1777 DEBUGP (("\n---response begin---\n%s---response end---\n", head));
1779 resp = resp_new (head);
1781 /* Check for status line. */
1783 statcode = resp_status (resp, &message);
1784 if (!opt.server_response)
1785 logprintf (LOG_VERBOSE, "%2d %s\n", statcode,
1786 message ? escnonprint (message) : "");
1789 logprintf (LOG_VERBOSE, "\n");
1790 print_server_response (resp, " ");
1793 /* Determine the local filename if needed. Notice that if -O is used
1794 * hstat.local_file is set by http_loop to the argument of -O. */
1795 if (!hs->local_file)
1797 /* Honor Content-Disposition whether possible. */
1798 if (!opt.content_disposition
1799 || !resp_header_copy (resp, "Content-Disposition",
1800 hdrval, sizeof (hdrval))
1801 || !parse_content_disposition (hdrval, &hs->local_file))
1803 /* The Content-Disposition header is missing or broken.
1804 * Choose unique file name according to given URL. */
1805 hs->local_file = url_file_name (u);
1809 /* TODO: perform this check only once. */
1810 if (file_exists_p (hs->local_file))
1814 /* If opt.noclobber is turned on and file already exists, do not
1815 retrieve the file */
1816 logprintf (LOG_VERBOSE, _("\
1817 File `%s' already there; not retrieving.\n\n"), hs->local_file);
1818 /* If the file is there, we suppose it's retrieved OK. */
1821 /* #### Bogusness alert. */
1822 /* If its suffix is "html" or "htm" or similar, assume text/html. */
1823 if (has_html_suffix_p (hs->local_file))
1826 return RETRUNNEEDED;
1828 else if (!ALLOW_CLOBBER)
1830 char *unique = unique_name (hs->local_file, true);
1831 if (unique != hs->local_file)
1832 xfree (hs->local_file);
1833 hs->local_file = unique;
1837 /* Support timestamping */
1838 /* TODO: move this code out of gethttp. */
1839 if (opt.timestamping && !hs->timestamp_checked)
1841 size_t filename_len = strlen (hs->local_file);
1842 char *filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1843 bool local_dot_orig_file_exists = false;
1844 char *local_filename = NULL;
1847 if (opt.backup_converted)
1848 /* If -K is specified, we'll act on the assumption that it was specified
1849 last time these files were downloaded as well, and instead of just
1850 comparing local file X against server file X, we'll compare local
1851 file X.orig (if extant, else X) against server file X. If -K
1852 _wasn't_ specified last time, or the server contains files called
1853 *.orig, -N will be back to not operating correctly with -k. */
1855 /* Would a single s[n]printf() call be faster? --dan
1857 Definitely not. sprintf() is horribly slow. It's a
1858 different question whether the difference between the two
1859 affects a program. Usually I'd say "no", but at one
1860 point I profiled Wget, and found that a measurable and
1861 non-negligible amount of time was lost calling sprintf()
1862 in url.c. Replacing sprintf with inline calls to
1863 strcpy() and number_to_string() made a difference.
1865 memcpy (filename_plus_orig_suffix, hs->local_file, filename_len);
1866 memcpy (filename_plus_orig_suffix + filename_len,
1867 ".orig", sizeof (".orig"));
1869 /* Try to stat() the .orig file. */
1870 if (stat (filename_plus_orig_suffix, &st) == 0)
1872 local_dot_orig_file_exists = true;
1873 local_filename = filename_plus_orig_suffix;
1877 if (!local_dot_orig_file_exists)
1878 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1879 if (stat (hs->local_file, &st) == 0)
1880 local_filename = hs->local_file;
1882 if (local_filename != NULL)
1883 /* There was a local file, so we'll check later to see if the version
1884 the server has is the same version we already have, allowing us to
1887 hs->orig_file_name = xstrdup (local_filename);
1888 hs->orig_file_size = st.st_size;
1889 hs->orig_file_tstamp = st.st_mtime;
1891 /* Modification time granularity is 2 seconds for Windows, so
1892 increase local time by 1 second for later comparison. */
1893 ++hs->orig_file_tstamp;
1898 if (!opt.ignore_length
1899 && resp_header_copy (resp, "Content-Length", hdrval, sizeof (hdrval)))
1903 parsed = str_to_wgint (hdrval, NULL, 10);
1904 if (parsed == WGINT_MAX && errno == ERANGE)
1907 #### If Content-Length is out of range, it most likely
1908 means that the file is larger than 2G and that we're
1909 compiled without LFS. In that case we should probably
1910 refuse to even attempt to download the file. */
1913 else if (parsed < 0)
1915 /* Negative Content-Length; nonsensical, so we can't
1916 assume any information about the content to receive. */
1923 /* Check for keep-alive related responses. */
1924 if (!inhibit_keep_alive && contlen != -1)
1926 if (resp_header_copy (resp, "Keep-Alive", NULL, 0))
1928 else if (resp_header_copy (resp, "Connection", hdrval, sizeof (hdrval)))
1930 if (0 == strcasecmp (hdrval, "Keep-Alive"))
1935 /* The server has promised that it will not close the connection
1936 when we're done. This means that we can register it. */
1937 register_persistent (conn->host, conn->port, sock, using_ssl);
1939 if (statcode == HTTP_STATUS_UNAUTHORIZED)
1941 /* Authorization is required. */
1942 if (keep_alive && !head_only && skip_short_body (sock, contlen))
1943 CLOSE_FINISH (sock);
1945 CLOSE_INVALIDATE (sock);
1946 pconn.authorized = false;
1947 if (!auth_finished && (user && passwd))
1949 /* IIS sends multiple copies of WWW-Authenticate, one with
1950 the value "negotiate", and other(s) with data. Loop over
1951 all the occurrences and pick the one we recognize. */
1953 const char *wabeg, *waend;
1954 char *www_authenticate = NULL;
1956 (wapos = resp_header_locate (resp, "WWW-Authenticate", wapos,
1957 &wabeg, &waend)) != -1;
1959 if (known_authentication_scheme_p (wabeg, waend))
1961 BOUNDED_TO_ALLOCA (wabeg, waend, www_authenticate);
1965 if (!www_authenticate)
1967 /* If the authentication header is missing or
1968 unrecognized, there's no sense in retrying. */
1969 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1971 else if (!basic_auth_finished
1972 || !BEGINS_WITH (www_authenticate, "Basic"))
1975 pth = url_full_path (u);
1976 request_set_header (req, "Authorization",
1977 create_authorization_line (www_authenticate,
1979 request_method (req),
1983 if (BEGINS_WITH (www_authenticate, "NTLM"))
1985 else if (!u->user && BEGINS_WITH (www_authenticate, "Basic"))
1987 /* Need to register this host as using basic auth,
1988 * so we automatically send creds next time. */
1989 register_basic_auth_host (u->host);
1992 goto retry_with_auth;
1996 /* We already did Basic auth, and it failed. Gotta
2000 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
2004 else /* statcode != HTTP_STATUS_UNAUTHORIZED */
2006 /* Kludge: if NTLM is used, mark the TCP connection as authorized. */
2008 pconn.authorized = true;
2012 hs->statcode = statcode;
2014 hs->error = xstrdup (_("Malformed status line"));
2016 hs->error = xstrdup (_("(no description)"));
2018 hs->error = xstrdup (message);
2019 xfree_null (message);
2021 type = resp_header_strdup (resp, "Content-Type");
2024 char *tmp = strchr (type, ';');
2027 while (tmp > type && c_isspace (tmp[-1]))
2032 hs->newloc = resp_header_strdup (resp, "Location");
2033 hs->remote_time = resp_header_strdup (resp, "Last-Modified");
2035 /* Handle (possibly multiple instances of) the Set-Cookie header. */
2039 const char *scbeg, *scend;
2040 /* The jar should have been created by now. */
2041 assert (wget_cookie_jar != NULL);
2043 (scpos = resp_header_locate (resp, "Set-Cookie", scpos,
2044 &scbeg, &scend)) != -1;
2047 char *set_cookie; BOUNDED_TO_ALLOCA (scbeg, scend, set_cookie);
2048 cookie_handle_set_cookie (wget_cookie_jar, u->host, u->port,
2049 u->path, set_cookie);
2053 if (resp_header_copy (resp, "Content-Range", hdrval, sizeof (hdrval)))
2055 wgint first_byte_pos, last_byte_pos, entity_length;
2056 if (parse_content_range (hdrval, &first_byte_pos, &last_byte_pos,
2059 contrange = first_byte_pos;
2060 contlen = last_byte_pos - first_byte_pos + 1;
2065 /* 20x responses are counted among successful by default. */
2066 if (H_20X (statcode))
2069 /* Return if redirected. */
2070 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
2072 /* RFC2068 says that in case of the 300 (multiple choices)
2073 response, the server can output a preferred URL through
2074 `Location' header; otherwise, the request should be treated
2075 like GET. So, if the location is set, it will be a
2076 redirection; otherwise, just proceed normally. */
2077 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
2081 logprintf (LOG_VERBOSE,
2082 _("Location: %s%s\n"),
2083 hs->newloc ? escnonprint_uri (hs->newloc) : _("unspecified"),
2084 hs->newloc ? _(" [following]") : "");
2085 if (keep_alive && !head_only && skip_short_body (sock, contlen))
2086 CLOSE_FINISH (sock);
2088 CLOSE_INVALIDATE (sock);
2094 /* If content-type is not given, assume text/html. This is because
2095 of the multitude of broken CGI's that "forget" to generate the
2098 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) ||
2099 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S)))
2104 if (opt.html_extension && (*dt & TEXTHTML))
2105 /* -E / --html-extension / html_extension = on was specified, and this is a
2106 text/html file. If some case-insensitive variation on ".htm[l]" isn't
2107 already the file's suffix, tack on ".html". */
2109 char *last_period_in_local_filename = strrchr (hs->local_file, '.');
2111 if (last_period_in_local_filename == NULL
2112 || !(0 == strcasecmp (last_period_in_local_filename, ".htm")
2113 || 0 == strcasecmp (last_period_in_local_filename, ".html")))
2115 int local_filename_len = strlen (hs->local_file);
2116 /* Resize the local file, allowing for ".html" preceded by
2117 optional ".NUMBER". */
2118 hs->local_file = xrealloc (hs->local_file,
2119 local_filename_len + 24 + sizeof (".html"));
2120 strcpy(hs->local_file + local_filename_len, ".html");
2121 /* If clobbering is not allowed and the file, as named,
2122 exists, tack on ".NUMBER.html" instead. */
2123 if (!ALLOW_CLOBBER && file_exists_p (hs->local_file))
2127 sprintf (hs->local_file + local_filename_len,
2128 ".%d.html", ext_num++);
2129 while (file_exists_p (hs->local_file));
2131 *dt |= ADDED_HTML_EXTENSION;
2135 if (statcode == HTTP_STATUS_RANGE_NOT_SATISFIABLE)
2137 /* If `-c' is in use and the file has been fully downloaded (or
2138 the remote file has shrunk), Wget effectively requests bytes
2139 after the end of file and the server response with 416. */
2140 logputs (LOG_VERBOSE, _("\
2141 \n The file is already fully retrieved; nothing to do.\n\n"));
2142 /* In case the caller inspects. */
2145 /* Mark as successfully retrieved. */
2148 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
2149 might be more bytes in the body. */
2150 return RETRUNNEEDED;
2152 if ((contrange != 0 && contrange != hs->restval)
2153 || (H_PARTIAL (statcode) && !contrange))
2155 /* The Range request was somehow misunderstood by the server.
2158 CLOSE_INVALIDATE (sock);
2164 hs->contlen = contlen + contrange;
2170 /* No need to print this output if the body won't be
2171 downloaded at all, or if the original server response is
2173 logputs (LOG_VERBOSE, _("Length: "));
2176 logputs (LOG_VERBOSE, number_to_static_string (contlen + contrange));
2177 if (contlen + contrange >= 1024)
2178 logprintf (LOG_VERBOSE, " (%s)",
2179 human_readable (contlen + contrange));
2182 if (contlen >= 1024)
2183 logprintf (LOG_VERBOSE, _(", %s (%s) remaining"),
2184 number_to_static_string (contlen),
2185 human_readable (contlen));
2187 logprintf (LOG_VERBOSE, _(", %s remaining"),
2188 number_to_static_string (contlen));
2192 logputs (LOG_VERBOSE,
2193 opt.ignore_length ? _("ignored") : _("unspecified"));
2195 logprintf (LOG_VERBOSE, " [%s]\n", escnonprint (type));
2197 logputs (LOG_VERBOSE, "\n");
2201 type = NULL; /* We don't need it any more. */
2203 /* Return if we have no intention of further downloading. */
2204 if (!(*dt & RETROKF) || head_only)
2206 /* In case the caller cares to look... */
2211 /* Pre-1.10 Wget used CLOSE_INVALIDATE here. Now we trust the
2212 servers not to send body in response to a HEAD request, and
2213 those that do will likely be caught by test_socket_open.
2214 If not, they can be worked around using
2215 `--no-http-keep-alive'. */
2216 CLOSE_FINISH (sock);
2217 else if (keep_alive && skip_short_body (sock, contlen))
2218 /* Successfully skipped the body; also keep using the socket. */
2219 CLOSE_FINISH (sock);
2221 CLOSE_INVALIDATE (sock);
2222 return RETRFINISHED;
2225 /* Open the local file. */
2228 mkalldirs (hs->local_file);
2230 rotate_backups (hs->local_file);
2232 fp = fopen (hs->local_file, "ab");
2233 else if (ALLOW_CLOBBER)
2234 fp = fopen (hs->local_file, "wb");
2237 fp = fopen_excl (hs->local_file, true);
2238 if (!fp && errno == EEXIST)
2240 /* We cannot just invent a new name and use it (which is
2241 what functions like unique_create typically do)
2242 because we told the user we'd use this name.
2243 Instead, return and retry the download. */
2244 logprintf (LOG_NOTQUIET,
2245 _("%s has sprung into existence.\n"),
2247 CLOSE_INVALIDATE (sock);
2248 return FOPEN_EXCL_ERR;
2253 logprintf (LOG_NOTQUIET, "%s: %s\n", hs->local_file, strerror (errno));
2254 CLOSE_INVALIDATE (sock);
2261 /* Print fetch message, if opt.verbose. */
2264 logprintf (LOG_NOTQUIET, _("Saving to: `%s'\n"),
2265 HYPHENP (hs->local_file) ? "STDOUT" : hs->local_file);
2268 /* This confuses the timestamping code that checks for file size.
2269 #### The timestamping code should be smarter about file size. */
2270 if (opt.save_headers && hs->restval == 0)
2271 fwrite (head, 1, strlen (head), fp);
2273 /* Now we no longer need to store the response header. */
2276 /* Download the request body. */
2279 /* If content-length is present, read that much; otherwise, read
2280 until EOF. The HTTP spec doesn't require the server to
2281 actually close the connection when it's done sending data. */
2282 flags |= rb_read_exactly;
2283 if (hs->restval > 0 && contrange == 0)
2284 /* If the server ignored our range request, instruct fd_read_body
2285 to skip the first RESTVAL bytes of body. */
2286 flags |= rb_skip_startpos;
2287 hs->len = hs->restval;
2289 hs->res = fd_read_body (sock, fp, contlen != -1 ? contlen : 0,
2290 hs->restval, &hs->rd_size, &hs->len, &hs->dltime,
2294 CLOSE_FINISH (sock);
2298 hs->rderrmsg = xstrdup (fd_errstr (sock));
2299 CLOSE_INVALIDATE (sock);
2306 return RETRFINISHED;
2309 /* The genuine HTTP loop! This is the part where the retrieval is
2310 retried, and retried, and retried, and... */
2312 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
2313 int *dt, struct url *proxy)
2316 bool got_head = false; /* used for time-stamping and filename detection */
2317 bool time_came_from_head = false;
2318 bool got_name = false;
2321 uerr_t err, ret = TRYLIMEXC;
2322 time_t tmr = -1; /* remote time-stamp */
2323 struct http_stat hstat; /* HTTP status */
2325 bool send_head_first = true;
2327 /* Assert that no value for *LOCAL_FILE was passed. */
2328 assert (local_file == NULL || *local_file == NULL);
2330 /* Set LOCAL_FILE parameter. */
2331 if (local_file && opt.output_document)
2332 *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document);
2334 /* Reset NEWLOC parameter. */
2337 /* This used to be done in main(), but it's a better idea to do it
2338 here so that we don't go through the hoops if we're just using
2343 /* Warn on (likely bogus) wildcard usage in HTTP. */
2344 if (opt.ftp_glob && has_wildcards_p (u->path))
2345 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
2347 /* Setup hstat struct. */
2349 hstat.referer = referer;
2351 if (opt.output_document)
2353 hstat.local_file = xstrdup (opt.output_document);
2356 else if (!opt.content_disposition)
2358 hstat.local_file = url_file_name (u);
2362 /* Reset the counter. */
2365 /* Reset the document type. */
2368 /* Skip preliminary HEAD request if we're not in spider mode AND
2369 * if -O was given or HTTP Content-Disposition support is disabled. */
2371 && (got_name || !opt.content_disposition))
2372 send_head_first = false;
2374 /* Send preliminary HEAD request if -N is given and we have an existing
2375 * destination file. */
2376 if (opt.timestamping
2377 && !opt.content_disposition
2378 && file_exists_p (url_file_name (u)))
2379 send_head_first = true;
2384 /* Increment the pass counter. */
2386 sleep_between_retrievals (count);
2388 /* Get the current time string. */
2389 tms = datetime_str (time (NULL));
2391 if (opt.spider && !got_head)
2392 logprintf (LOG_VERBOSE, _("\
2393 Spider mode enabled. Check if remote file exists.\n"));
2395 /* Print fetch message, if opt.verbose. */
2398 char *hurl = url_string (u, URL_AUTH_HIDE_PASSWD);
2403 sprintf (tmp, _("(try:%2d)"), count);
2404 logprintf (LOG_NOTQUIET, "--%s-- %s %s\n",
2409 logprintf (LOG_NOTQUIET, "--%s-- %s\n",
2414 ws_changetitle (hurl);
2419 /* Default document type is empty. However, if spider mode is
2420 on or time-stamping is employed, HEAD_ONLY commands is
2421 encoded within *dt. */
2422 if (send_head_first && !got_head)
2427 /* Decide whether or not to restart. */
2430 && stat (hstat.local_file, &st) == 0
2431 && S_ISREG (st.st_mode))
2432 /* When -c is used, continue from on-disk size. (Can't use
2433 hstat.len even if count>1 because we don't want a failed
2434 first attempt to clobber existing data.) */
2435 hstat.restval = st.st_size;
2437 /* otherwise, continue where the previous try left off */
2438 hstat.restval = hstat.len;
2442 /* Decide whether to send the no-cache directive. We send it in
2444 a) we're using a proxy, and we're past our first retrieval.
2445 Some proxies are notorious for caching incomplete data, so
2446 we require a fresh get.
2447 b) caching is explicitly inhibited. */
2448 if ((proxy && count > 1) /* a */
2449 || !opt.allow_cache) /* b */
2450 *dt |= SEND_NOCACHE;
2452 *dt &= ~SEND_NOCACHE;
2454 /* Try fetching the document, or at least its head. */
2455 err = gethttp (u, &hstat, dt, proxy);
2458 tms = datetime_str (time (NULL));
2460 /* Get the new location (with or without the redirection). */
2462 *newloc = xstrdup (hstat.newloc);
2466 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
2467 case CONERROR: case READERR: case WRITEFAILED:
2468 case RANGEERR: case FOPEN_EXCL_ERR:
2469 /* Non-fatal errors continue executing the loop, which will
2470 bring them to "while" statement at the end, to judge
2471 whether the number of tries was exceeded. */
2472 printwhat (count, opt.ntry);
2474 case FWRITEERR: case FOPENERR:
2475 /* Another fatal error. */
2476 logputs (LOG_VERBOSE, "\n");
2477 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
2478 hstat.local_file, strerror (errno));
2479 case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED:
2480 case SSLINITFAILED: case CONTNOTSUPPORTED:
2481 /* Fatal errors just return from the function. */
2485 /* Another fatal error. */
2486 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
2490 /* Return the new location to the caller. */
2493 logprintf (LOG_NOTQUIET,
2494 _("ERROR: Redirection (%d) without location.\n"),
2504 /* The file was already fully retrieved. */
2508 /* Deal with you later. */
2511 /* All possibilities should have been exhausted. */
2515 if (!(*dt & RETROKF))
2520 /* #### Ugly ugly ugly! */
2521 hurl = url_string (u, URL_AUTH_HIDE_PASSWD);
2522 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
2525 /* Fall back to GET if HEAD fails with a 500 or 501 error code. */
2527 && (hstat.statcode == 500 || hstat.statcode == 501))
2532 /* Maybe we should always keep track of broken links, not just in
2534 else if (opt.spider)
2536 /* #### Again: ugly ugly ugly! */
2538 hurl = url_string (u, URL_AUTH_HIDE_PASSWD);
2539 nonexisting_url (hurl);
2540 logprintf (LOG_NOTQUIET, _("\
2541 Remote file does not exist -- broken link!!!\n"));
2545 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
2546 tms, hstat.statcode, escnonprint (hstat.error));
2548 logputs (LOG_VERBOSE, "\n");
2554 /* Did we get the time-stamp? */
2557 got_head = true; /* no more time-stamping */
2559 if (opt.timestamping && !hstat.remote_time)
2561 logputs (LOG_NOTQUIET, _("\
2562 Last-modified header missing -- time-stamps turned off.\n"));
2564 else if (hstat.remote_time)
2566 /* Convert the date-string into struct tm. */
2567 tmr = http_atotm (hstat.remote_time);
2568 if (tmr == (time_t) (-1))
2569 logputs (LOG_VERBOSE, _("\
2570 Last-modified header invalid -- time-stamp ignored.\n"));
2571 if (*dt & HEAD_ONLY)
2572 time_came_from_head = true;
2575 if (send_head_first)
2577 /* The time-stamping section. */
2578 if (opt.timestamping)
2580 if (hstat.orig_file_name) /* Perform the following
2581 checks only if the file
2583 download already exists. */
2585 if (hstat.remote_time &&
2586 tmr != (time_t) (-1))
2588 /* Now time-stamping can be used validly.
2589 Time-stamping means that if the sizes of
2590 the local and remote file match, and local
2591 file is newer than the remote file, it will
2592 not be retrieved. Otherwise, the normal
2593 download procedure is resumed. */
2594 if (hstat.orig_file_tstamp >= tmr)
2596 if (hstat.contlen == -1
2597 || hstat.orig_file_size == hstat.contlen)
2599 logprintf (LOG_VERBOSE, _("\
2600 Server file no newer than local file `%s' -- not retrieving.\n\n"),
2601 hstat.orig_file_name);
2607 logprintf (LOG_VERBOSE, _("\
2608 The sizes do not match (local %s) -- retrieving.\n"),
2609 number_to_static_string (hstat.orig_file_size));
2613 logputs (LOG_VERBOSE,
2614 _("Remote file is newer, retrieving.\n"));
2616 logputs (LOG_VERBOSE, "\n");
2620 /* free_hstat (&hstat); */
2621 hstat.timestamp_checked = true;
2630 logputs (LOG_VERBOSE, _("\
2631 Remote file exists and could contain links to other resources -- retrieving.\n\n"));
2635 logprintf (LOG_VERBOSE, _("\
2636 Remote file exists but does not contain any link -- not retrieving.\n\n"));
2637 ret = RETROK; /* RETRUNNEEDED is not for caller. */
2643 logprintf (LOG_VERBOSE, _("\
2644 Remote file exists but recursion is disabled -- not retrieving.\n\n"));
2645 ret = RETROK; /* RETRUNNEEDED is not for caller. */
2652 count = 0; /* the retrieve count for HEAD is reset */
2654 } /* send_head_first */
2657 if ((tmr != (time_t) (-1))
2658 && ((hstat.len == hstat.contlen) ||
2659 ((hstat.res == 0) && (hstat.contlen == -1))))
2661 /* #### This code repeats in http.c and ftp.c. Move it to a
2663 const char *fl = NULL;
2664 if (opt.output_document)
2666 if (output_stream_regular)
2667 fl = opt.output_document;
2670 fl = hstat.local_file;
2674 /* Reparse time header, in case it's changed. */
2675 if (time_came_from_head
2676 && hstat.remote_time && hstat.remote_time[0])
2678 newtmr = http_atotm (hstat.remote_time);
2685 /* End of time-stamping section. */
2687 tmrate = retr_rate (hstat.rd_size, hstat.dltime);
2688 total_download_time += hstat.dltime;
2690 if (hstat.len == hstat.contlen)
2694 logprintf (LOG_VERBOSE,
2695 _("%s (%s) - `%s' saved [%s/%s]\n\n"),
2696 tms, tmrate, hstat.local_file,
2697 number_to_static_string (hstat.len),
2698 number_to_static_string (hstat.contlen));
2699 logprintf (LOG_NONVERBOSE,
2700 "%s URL:%s [%s/%s] -> \"%s\" [%d]\n",
2702 number_to_static_string (hstat.len),
2703 number_to_static_string (hstat.contlen),
2704 hstat.local_file, count);
2707 total_downloaded_bytes += hstat.len;
2709 /* Remember that we downloaded the file for later ".orig" code. */
2710 if (*dt & ADDED_HTML_EXTENSION)
2711 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, hstat.local_file);
2713 downloaded_file(FILE_DOWNLOADED_NORMALLY, hstat.local_file);
2718 else if (hstat.res == 0) /* No read error */
2720 if (hstat.contlen == -1) /* We don't know how much we were supposed
2721 to get, so assume we succeeded. */
2725 logprintf (LOG_VERBOSE,
2726 _("%s (%s) - `%s' saved [%s]\n\n"),
2727 tms, tmrate, hstat.local_file,
2728 number_to_static_string (hstat.len));
2729 logprintf (LOG_NONVERBOSE,
2730 "%s URL:%s [%s] -> \"%s\" [%d]\n",
2731 tms, u->url, number_to_static_string (hstat.len),
2732 hstat.local_file, count);
2735 total_downloaded_bytes += hstat.len;
2737 /* Remember that we downloaded the file for later ".orig" code. */
2738 if (*dt & ADDED_HTML_EXTENSION)
2739 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, hstat.local_file);
2741 downloaded_file(FILE_DOWNLOADED_NORMALLY, hstat.local_file);
2746 else if (hstat.len < hstat.contlen) /* meaning we lost the
2747 connection too soon */
2749 logprintf (LOG_VERBOSE,
2750 _("%s (%s) - Connection closed at byte %s. "),
2751 tms, tmrate, number_to_static_string (hstat.len));
2752 printwhat (count, opt.ntry);
2756 /* Getting here would mean reading more data than
2757 requested with content-length, which we never do. */
2760 else /* from now on hstat.res can only be -1 */
2762 if (hstat.contlen == -1)
2764 logprintf (LOG_VERBOSE,
2765 _("%s (%s) - Read error at byte %s (%s)."),
2766 tms, tmrate, number_to_static_string (hstat.len),
2768 printwhat (count, opt.ntry);
2771 else /* hstat.res == -1 and contlen is given */
2773 logprintf (LOG_VERBOSE,
2774 _("%s (%s) - Read error at byte %s/%s (%s). "),
2776 number_to_static_string (hstat.len),
2777 number_to_static_string (hstat.contlen),
2779 printwhat (count, opt.ntry);
2785 while (!opt.ntry || (count < opt.ntry));
2789 *local_file = xstrdup (hstat.local_file);
2790 free_hstat (&hstat);
2795 /* Check whether the result of strptime() indicates success.
2796 strptime() returns the pointer to how far it got to in the string.
2797 The processing has been successful if the string is at `GMT' or
2798 `+X', or at the end of the string.
2800 In extended regexp parlance, the function returns 1 if P matches
2801 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2802 can return) is considered a failure and 0 is returned. */
2804 check_end (const char *p)
2808 while (c_isspace (*p))
2811 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2812 || ((p[0] == '+' || p[0] == '-') && c_isdigit (p[1])))
2818 /* Convert the textual specification of time in TIME_STRING to the
2819 number of seconds since the Epoch.
2821 TIME_STRING can be in any of the three formats RFC2616 allows the
2822 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date,
2823 as well as the time format used in the Set-Cookie header.
2824 Timezones are ignored, and should be GMT.
2826 Return the computed time_t representation, or -1 if the conversion
2829 This function uses strptime with various string formats for parsing
2830 TIME_STRING. This results in a parser that is not as lenient in
2831 interpreting TIME_STRING as I would like it to be. Being based on
2832 strptime, it always allows shortened months, one-digit days, etc.,
2833 but due to the multitude of formats in which time can be
2834 represented, an ideal HTTP time parser would be even more
2835 forgiving. It should completely ignore things like week days and
2836 concentrate only on the various forms of representing years,
2837 months, days, hours, minutes, and seconds. For example, it would
2838 be nice if it accepted ISO 8601 out of the box.
2840 I've investigated free and PD code for this purpose, but none was
2841 usable. getdate was big and unwieldy, and had potential copyright
2842 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2843 distributed with phttpd, is excellent, but we cannot use it because
2844 it is not assigned to the FSF. So I stuck it with strptime. */
2847 http_atotm (const char *time_string)
2849 /* NOTE: Solaris strptime man page claims that %n and %t match white
2850 space, but that's not universally available. Instead, we simply
2851 use ` ' to mean "skip all WS", which works under all strptime
2852 implementations I've tested. */
2854 static const char *time_formats[] = {
2855 "%a, %d %b %Y %T", /* rfc1123: Thu, 29 Jan 1998 22:12:57 */
2856 "%A, %d-%b-%y %T", /* rfc850: Thursday, 29-Jan-98 22:12:57 */
2857 "%a %b %d %T %Y", /* asctime: Thu Jan 29 22:12:57 1998 */
2858 "%a, %d-%b-%Y %T" /* cookies: Thu, 29-Jan-1998 22:12:57
2859 (used in Set-Cookie, defined in the
2860 Netscape cookie specification.) */
2862 const char *oldlocale;
2864 time_t ret = (time_t) -1;
2866 /* Solaris strptime fails to recognize English month names in
2867 non-English locales, which we work around by temporarily setting
2868 locale to C before invoking strptime. */
2869 oldlocale = setlocale (LC_TIME, NULL);
2870 setlocale (LC_TIME, "C");
2872 for (i = 0; i < countof (time_formats); i++)
2876 /* Some versions of strptime use the existing contents of struct
2877 tm to recalculate the date according to format. Zero it out
2878 to prevent stack garbage from influencing strptime. */
2881 if (check_end (strptime (time_string, time_formats[i], &t)))
2888 /* Restore the previous locale. */
2889 setlocale (LC_TIME, oldlocale);
2894 /* Authorization support: We support three authorization schemes:
2896 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2898 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2899 consisting of answering to the server's challenge with the proper
2902 * `NTLM' ("NT Lan Manager") scheme, based on code written by Daniel
2903 Stenberg for libcurl. Like digest, NTLM is based on a
2904 challenge-response mechanism, but unlike digest, it is non-standard
2905 (authenticates TCP connections rather than requests), undocumented
2906 and Microsoft-specific. */
2908 /* Create the authentication header contents for the `Basic' scheme.
2909 This is done by encoding the string "USER:PASS" to base64 and
2910 prepending the string "Basic " in front of it. */
2913 basic_authentication_encode (const char *user, const char *passwd)
2916 int len1 = strlen (user) + 1 + strlen (passwd);
2918 t1 = (char *)alloca (len1 + 1);
2919 sprintf (t1, "%s:%s", user, passwd);
2921 t2 = (char *)alloca (BASE64_LENGTH (len1) + 1);
2922 base64_encode (t1, len1, t2);
2924 return concat_strings ("Basic ", t2, (char *) 0);
2927 #define SKIP_WS(x) do { \
2928 while (c_isspace (*(x))) \
2932 #ifdef ENABLE_DIGEST
2933 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2934 an array of 16 bytes containing the hash keys, and BUF should be a
2935 buffer of 33 writable characters (32 for hex digits plus one for
2936 zero termination). */
2938 dump_hash (char *buf, const unsigned char *hash)
2942 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2944 *buf++ = XNUM_TO_digit (*hash >> 4);
2945 *buf++ = XNUM_TO_digit (*hash & 0xf);
2950 /* Take the line apart to find the challenge, and compose a digest
2951 authorization header. See RFC2069 section 2.1.2. */
2953 digest_authentication_encode (const char *au, const char *user,
2954 const char *passwd, const char *method,
2957 static char *realm, *opaque, *nonce;
2962 { "realm", &realm },
2963 { "opaque", &opaque },
2967 param_token name, value;
2969 realm = opaque = nonce = NULL;
2971 au += 6; /* skip over `Digest' */
2972 while (extract_param (&au, &name, &value, ','))
2975 for (i = 0; i < countof (options); i++)
2976 if (name.e - name.b == strlen (options[i].name)
2977 && 0 == strncmp (name.b, options[i].name, name.e - name.b))
2979 *options[i].variable = strdupdelim (value.b, value.e);
2983 if (!realm || !nonce || !user || !passwd || !path || !method)
2986 xfree_null (opaque);
2991 /* Calculate the digest value. */
2993 ALLOCA_MD5_CONTEXT (ctx);
2994 unsigned char hash[MD5_HASHLEN];
2995 char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2996 char response_digest[MD5_HASHLEN * 2 + 1];
2998 /* A1BUF = H(user ":" realm ":" password) */
3000 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
3001 gen_md5_update ((unsigned char *)":", 1, ctx);
3002 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
3003 gen_md5_update ((unsigned char *)":", 1, ctx);
3004 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
3005 gen_md5_finish (ctx, hash);
3006 dump_hash (a1buf, hash);
3008 /* A2BUF = H(method ":" path) */
3010 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
3011 gen_md5_update ((unsigned char *)":", 1, ctx);
3012 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
3013 gen_md5_finish (ctx, hash);
3014 dump_hash (a2buf, hash);
3016 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
3018 gen_md5_update ((unsigned char *)a1buf, MD5_HASHLEN * 2, ctx);
3019 gen_md5_update ((unsigned char *)":", 1, ctx);
3020 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
3021 gen_md5_update ((unsigned char *)":", 1, ctx);
3022 gen_md5_update ((unsigned char *)a2buf, MD5_HASHLEN * 2, ctx);
3023 gen_md5_finish (ctx, hash);
3024 dump_hash (response_digest, hash);
3026 res = xmalloc (strlen (user)
3031 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
3032 + (opaque ? strlen (opaque) : 0)
3034 sprintf (res, "Digest \
3035 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
3036 user, realm, nonce, path, response_digest);
3039 char *p = res + strlen (res);
3040 strcat (p, ", opaque=\"");
3047 #endif /* ENABLE_DIGEST */
3049 /* Computing the size of a string literal must take into account that
3050 value returned by sizeof includes the terminating \0. */
3051 #define STRSIZE(literal) (sizeof (literal) - 1)
3053 /* Whether chars in [b, e) begin with the literal string provided as
3054 first argument and are followed by whitespace or terminating \0.
3055 The comparison is case-insensitive. */
3056 #define STARTS(literal, b, e) \
3057 ((e) - (b) >= STRSIZE (literal) \
3058 && 0 == strncasecmp (b, literal, STRSIZE (literal)) \
3059 && ((e) - (b) == STRSIZE (literal) \
3060 || c_isspace (b[STRSIZE (literal)])))
3063 known_authentication_scheme_p (const char *hdrbeg, const char *hdrend)
3065 return STARTS ("Basic", hdrbeg, hdrend)
3066 #ifdef ENABLE_DIGEST
3067 || STARTS ("Digest", hdrbeg, hdrend)
3070 || STARTS ("NTLM", hdrbeg, hdrend)
3077 /* Create the HTTP authorization request header. When the
3078 `WWW-Authenticate' response header is seen, according to the
3079 authorization scheme specified in that header (`Basic' and `Digest'
3080 are supported by the current implementation), produce an
3081 appropriate HTTP authorization request header. */
3083 create_authorization_line (const char *au, const char *user,
3084 const char *passwd, const char *method,
3085 const char *path, bool *finished)
3087 /* We are called only with known schemes, so we can dispatch on the
3089 switch (c_toupper (*au))
3091 case 'B': /* Basic */
3093 return basic_authentication_encode (user, passwd);
3094 #ifdef ENABLE_DIGEST
3095 case 'D': /* Digest */
3097 return digest_authentication_encode (au, user, passwd, method, path);
3100 case 'N': /* NTLM */
3101 if (!ntlm_input (&pconn.ntlm, au))
3106 return ntlm_output (&pconn.ntlm, user, passwd, finished);
3109 /* We shouldn't get here -- this function should be only called
3110 with values approved by known_authentication_scheme_p. */
3118 if (!wget_cookie_jar)
3119 wget_cookie_jar = cookie_jar_new ();
3120 if (opt.cookies_input && !cookies_loaded_p)
3122 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
3123 cookies_loaded_p = true;
3130 if (wget_cookie_jar)
3131 cookie_jar_save (wget_cookie_jar, opt.cookies_output);
3137 xfree_null (pconn.host);
3138 if (wget_cookie_jar)
3139 cookie_jar_delete (wget_cookie_jar);
3146 test_parse_content_disposition()
3151 char *opt_dir_prefix;
3155 { "filename=\"file.ext\"", NULL, "file.ext", true },
3156 { "filename=\"file.ext\"", "somedir", "somedir/file.ext", true },
3157 { "attachment; filename=\"file.ext\"", NULL, "file.ext", true },
3158 { "attachment; filename=\"file.ext\"", "somedir", "somedir/file.ext", true },
3159 { "attachment; filename=\"file.ext\"; dummy", NULL, "file.ext", true },
3160 { "attachment; filename=\"file.ext\"; dummy", "somedir", "somedir/file.ext", true },
3161 { "attachment", NULL, NULL, false },
3162 { "attachment", "somedir", NULL, false },
3165 for (i = 0; i < sizeof(test_array)/sizeof(test_array[0]); ++i)
3170 opt.dir_prefix = test_array[i].opt_dir_prefix;
3171 res = parse_content_disposition (test_array[i].hdrval, &filename);
3173 mu_assert ("test_parse_content_disposition: wrong result",
3174 res == test_array[i].result
3176 || 0 == strcmp (test_array[i].filename, filename)));
3182 #endif /* TESTING */
3185 * vim: et sts=2 sw=2 cino+={s