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;
73 static char *create_authorization_line (const char *, const char *,
74 const char *, const char *,
75 const char *, bool *);
76 static char *basic_authentication_encode (const char *, const char *);
77 static bool known_authentication_scheme_p (const char *, const char *);
78 static void ensure_extension (struct http_stat *, const char *, int *);
79 static void load_cookies (void);
82 # define MIN(x, y) ((x) > (y) ? (y) : (x))
86 static bool cookies_loaded_p;
87 static struct cookie_jar *wget_cookie_jar;
89 #define TEXTHTML_S "text/html"
90 #define TEXTXHTML_S "application/xhtml+xml"
91 #define TEXTCSS_S "text/css"
93 /* Some status code validation macros: */
94 #define H_20X(x) (((x) >= 200) && ((x) < 300))
95 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
96 #define H_REDIRECTED(x) ((x) == HTTP_STATUS_MOVED_PERMANENTLY \
97 || (x) == HTTP_STATUS_MOVED_TEMPORARILY \
98 || (x) == HTTP_STATUS_SEE_OTHER \
99 || (x) == HTTP_STATUS_TEMPORARY_REDIRECT)
101 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
102 /* Successful 2xx. */
103 #define HTTP_STATUS_OK 200
104 #define HTTP_STATUS_CREATED 201
105 #define HTTP_STATUS_ACCEPTED 202
106 #define HTTP_STATUS_NO_CONTENT 204
107 #define HTTP_STATUS_PARTIAL_CONTENTS 206
109 /* Redirection 3xx. */
110 #define HTTP_STATUS_MULTIPLE_CHOICES 300
111 #define HTTP_STATUS_MOVED_PERMANENTLY 301
112 #define HTTP_STATUS_MOVED_TEMPORARILY 302
113 #define HTTP_STATUS_SEE_OTHER 303 /* from HTTP/1.1 */
114 #define HTTP_STATUS_NOT_MODIFIED 304
115 #define HTTP_STATUS_TEMPORARY_REDIRECT 307 /* from HTTP/1.1 */
117 /* Client error 4xx. */
118 #define HTTP_STATUS_BAD_REQUEST 400
119 #define HTTP_STATUS_UNAUTHORIZED 401
120 #define HTTP_STATUS_FORBIDDEN 403
121 #define HTTP_STATUS_NOT_FOUND 404
122 #define HTTP_STATUS_RANGE_NOT_SATISFIABLE 416
124 /* Server errors 5xx. */
125 #define HTTP_STATUS_INTERNAL 500
126 #define HTTP_STATUS_NOT_IMPLEMENTED 501
127 #define HTTP_STATUS_BAD_GATEWAY 502
128 #define HTTP_STATUS_UNAVAILABLE 503
131 rel_none, rel_name, rel_value, rel_both
138 struct request_header {
140 enum rp release_policy;
142 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);
287 while (c_isspace (*p))
289 request_set_header (req, xstrdup (name), (char *) p, rel_name);
292 /* Remove the header with specified name from REQ. Returns true if
293 the header was actually removed, false 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);
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 static struct hash_table *basic_authed_hosts;
393 /* Find out if this host has issued a Basic challenge yet; if so, give
394 * it the username, password. A temporary measure until we can get
395 * proper authentication in place. */
398 maybe_send_basic_creds (const char *hostname, const char *user,
399 const char *passwd, struct request *req)
401 bool do_challenge = false;
403 if (opt.auth_without_challenge)
405 DEBUGP(("Auth-without-challenge set, sending Basic credentials.\n"));
408 else if (basic_authed_hosts
409 && hash_table_contains(basic_authed_hosts, hostname))
411 DEBUGP(("Found %s in basic_authed_hosts.\n", quote (hostname)));
416 DEBUGP(("Host %s has not issued a general basic challenge.\n",
421 request_set_header (req, "Authorization",
422 basic_authentication_encode (user, passwd),
429 register_basic_auth_host (const char *hostname)
431 if (!basic_authed_hosts)
433 basic_authed_hosts = make_nocase_string_hash_table (1);
435 if (!hash_table_contains(basic_authed_hosts, hostname))
437 hash_table_put (basic_authed_hosts, xstrdup(hostname), NULL);
438 DEBUGP(("Inserted %s into basic_authed_hosts\n", quote (hostname)));
443 /* Send the contents of FILE_NAME to SOCK. Make sure that exactly
444 PROMISED_SIZE bytes are sent over the wire -- if the file is
445 longer, read only that much; if the file is shorter, report an error. */
448 post_file (int sock, const char *file_name, wgint promised_size)
450 static char chunk[8192];
455 DEBUGP (("[writing POST file %s ... ", file_name));
457 fp = fopen (file_name, "rb");
460 while (!feof (fp) && written < promised_size)
463 int length = fread (chunk, 1, sizeof (chunk), fp);
466 towrite = MIN (promised_size - written, length);
467 write_error = fd_write (sock, chunk, towrite, -1);
477 /* If we've written less than was promised, report a (probably
478 nonsensical) error rather than break the promise. */
479 if (written < promised_size)
485 assert (written == promised_size);
486 DEBUGP (("done]\n"));
490 /* Determine whether [START, PEEKED + PEEKLEN) contains an empty line.
491 If so, return the pointer to the position after the line, otherwise
492 return NULL. This is used as callback to fd_read_hunk. The data
493 between START and PEEKED has been read and cannot be "unread"; the
494 data after PEEKED has only been peeked. */
497 response_head_terminator (const char *start, const char *peeked, int peeklen)
501 /* If at first peek, verify whether HUNK starts with "HTTP". If
502 not, this is a HTTP/0.9 request and we must bail out without
504 if (start == peeked && 0 != memcmp (start, "HTTP", MIN (peeklen, 4)))
507 /* Look for "\n[\r]\n", and return the following position if found.
508 Start two chars before the current to cover the possibility that
509 part of the terminator (e.g. "\n\r") arrived in the previous
511 p = peeked - start < 2 ? start : peeked - 2;
512 end = peeked + peeklen;
514 /* Check for \n\r\n or \n\n anywhere in [p, end-2). */
515 for (; p < end - 2; p++)
518 if (p[1] == '\r' && p[2] == '\n')
520 else if (p[1] == '\n')
523 /* p==end-2: check for \n\n directly preceding END. */
524 if (p[0] == '\n' && p[1] == '\n')
530 /* The maximum size of a single HTTP response we care to read. Rather
531 than being a limit of the reader implementation, this limit
532 prevents Wget from slurping all available memory upon encountering
533 malicious or buggy server output, thus protecting the user. Define
534 it to 0 to remove the limit. */
536 #define HTTP_RESPONSE_MAX_SIZE 65536
538 /* Read the HTTP request head from FD and return it. The error
539 conditions are the same as with fd_read_hunk.
541 To support HTTP/0.9 responses, this function tries to make sure
542 that the data begins with "HTTP". If this is not the case, no data
543 is read and an empty request is returned, so that the remaining
544 data can be treated as body. */
547 read_http_response_head (int fd)
549 return fd_read_hunk (fd, response_head_terminator, 512,
550 HTTP_RESPONSE_MAX_SIZE);
554 /* The response data. */
557 /* The array of pointers that indicate where each header starts.
558 For example, given this HTTP response:
565 The headers are located like this:
567 "HTTP/1.0 200 Ok\r\nDescription: some\r\n text\r\nEtag: x\r\n\r\n"
569 headers[0] headers[1] headers[2] headers[3]
571 I.e. headers[0] points to the beginning of the request,
572 headers[1] points to the end of the first header and the
573 beginning of the second one, etc. */
575 const char **headers;
578 /* Create a new response object from the text of the HTTP response,
579 available in HEAD. That text is automatically split into
580 constituent header lines for fast retrieval using
583 static struct response *
584 resp_new (const char *head)
589 struct response *resp = xnew0 (struct response);
594 /* Empty head means that we're dealing with a headerless
595 (HTTP/0.9) response. In that case, don't set HEADERS at
600 /* Split HEAD into header lines, so that resp_header_* functions
601 don't need to do this over and over again. */
607 DO_REALLOC (resp->headers, size, count + 1, const char *);
608 resp->headers[count++] = hdr;
610 /* Break upon encountering an empty line. */
611 if (!hdr[0] || (hdr[0] == '\r' && hdr[1] == '\n') || hdr[0] == '\n')
614 /* Find the end of HDR, including continuations. */
617 const char *end = strchr (hdr, '\n');
623 while (*hdr == ' ' || *hdr == '\t');
625 DO_REALLOC (resp->headers, size, count + 1, const char *);
626 resp->headers[count] = NULL;
631 /* Locate the header named NAME in the request data, starting with
632 position START. This allows the code to loop through the request
633 data, filtering for all requests of a given name. Returns the
634 found position, or -1 for failure. The code that uses this
635 function typically looks like this:
637 for (pos = 0; (pos = resp_header_locate (...)) != -1; pos++)
638 ... do something with header ...
640 If you only care about one header, use resp_header_get instead of
644 resp_header_locate (const struct response *resp, const char *name, int start,
645 const char **begptr, const char **endptr)
648 const char **headers = resp->headers;
651 if (!headers || !headers[1])
654 name_len = strlen (name);
660 for (; headers[i + 1]; i++)
662 const char *b = headers[i];
663 const char *e = headers[i + 1];
665 && b[name_len] == ':'
666 && 0 == strncasecmp (b, name, name_len))
669 while (b < e && c_isspace (*b))
671 while (b < e && c_isspace (e[-1]))
681 /* Find and retrieve the header named NAME in the request data. If
682 found, set *BEGPTR to its starting, and *ENDPTR to its ending
683 position, and return true. Otherwise return false.
685 This function is used as a building block for resp_header_copy
686 and resp_header_strdup. */
689 resp_header_get (const struct response *resp, const char *name,
690 const char **begptr, const char **endptr)
692 int pos = resp_header_locate (resp, name, 0, begptr, endptr);
696 /* Copy the response header named NAME to buffer BUF, no longer than
697 BUFSIZE (BUFSIZE includes the terminating 0). If the header
698 exists, true is returned, false otherwise. If there should be no
699 limit on the size of the header, use resp_header_strdup instead.
701 If BUFSIZE is 0, no data is copied, but the boolean indication of
702 whether the header is present is still returned. */
705 resp_header_copy (const struct response *resp, const char *name,
706 char *buf, int bufsize)
709 if (!resp_header_get (resp, name, &b, &e))
713 int len = MIN (e - b, bufsize - 1);
714 memcpy (buf, b, len);
720 /* Return the value of header named NAME in RESP, allocated with
721 malloc. If such a header does not exist in RESP, return NULL. */
724 resp_header_strdup (const struct response *resp, const char *name)
727 if (!resp_header_get (resp, name, &b, &e))
729 return strdupdelim (b, e);
732 /* Parse the HTTP status line, which is of format:
734 HTTP-Version SP Status-Code SP Reason-Phrase
736 The function returns the status-code, or -1 if the status line
737 appears malformed. The pointer to "reason-phrase" message is
738 returned in *MESSAGE. */
741 resp_status (const struct response *resp, char **message)
748 /* For a HTTP/0.9 response, assume status 200. */
750 *message = xstrdup (_("No headers, assuming HTTP/0.9"));
754 p = resp->headers[0];
755 end = resp->headers[1];
761 if (end - p < 4 || 0 != strncmp (p, "HTTP", 4))
765 /* Match the HTTP version. This is optional because Gnutella
766 servers have been reported to not specify HTTP version. */
767 if (p < end && *p == '/')
770 while (p < end && c_isdigit (*p))
772 if (p < end && *p == '.')
774 while (p < end && c_isdigit (*p))
778 while (p < end && c_isspace (*p))
780 if (end - p < 3 || !c_isdigit (p[0]) || !c_isdigit (p[1]) || !c_isdigit (p[2]))
783 status = 100 * (p[0] - '0') + 10 * (p[1] - '0') + (p[2] - '0');
788 while (p < end && c_isspace (*p))
790 while (p < end && c_isspace (end[-1]))
792 *message = strdupdelim (p, end);
798 /* Release the resources used by RESP. */
801 resp_free (struct response *resp)
803 xfree_null (resp->headers);
807 /* Print a single line of response, the characters [b, e). We tried
809 logprintf (LOG_VERBOSE, "%s%.*s\n", prefix, (int) (e - b), b);
810 but that failed to escape the non-printable characters and, in fact,
811 caused crashes in UTF-8 locales. */
814 print_response_line(const char *prefix, const char *b, const char *e)
817 BOUNDED_TO_ALLOCA(b, e, copy);
818 logprintf (LOG_ALWAYS, "%s%s\n", prefix,
819 quotearg_style (escape_quoting_style, copy));
822 /* Print the server response, line by line, omitting the trailing CRLF
823 from individual header lines, and prefixed with PREFIX. */
826 print_server_response (const struct response *resp, const char *prefix)
831 for (i = 0; resp->headers[i + 1]; i++)
833 const char *b = resp->headers[i];
834 const char *e = resp->headers[i + 1];
836 if (b < e && e[-1] == '\n')
838 if (b < e && e[-1] == '\r')
840 print_response_line(prefix, b, e);
844 /* Parse the `Content-Range' header and extract the information it
845 contains. Returns true if successful, false otherwise. */
847 parse_content_range (const char *hdr, wgint *first_byte_ptr,
848 wgint *last_byte_ptr, wgint *entity_length_ptr)
852 /* Ancient versions of Netscape proxy server, presumably predating
853 rfc2068, sent out `Content-Range' without the "bytes"
855 if (0 == strncasecmp (hdr, "bytes", 5))
858 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
862 while (c_isspace (*hdr))
867 if (!c_isdigit (*hdr))
869 for (num = 0; c_isdigit (*hdr); hdr++)
870 num = 10 * num + (*hdr - '0');
871 if (*hdr != '-' || !c_isdigit (*(hdr + 1)))
873 *first_byte_ptr = num;
875 for (num = 0; c_isdigit (*hdr); hdr++)
876 num = 10 * num + (*hdr - '0');
877 if (*hdr != '/' || !c_isdigit (*(hdr + 1)))
879 *last_byte_ptr = num;
884 for (num = 0; c_isdigit (*hdr); hdr++)
885 num = 10 * num + (*hdr - '0');
886 *entity_length_ptr = num;
890 /* Read the body of the request, but don't store it anywhere and don't
891 display a progress gauge. This is useful for reading the bodies of
892 administrative responses to which we will soon issue another
893 request. The response is not useful to the user, but reading it
894 allows us to continue using the same connection to the server.
896 If reading fails, false is returned, true otherwise. In debug
897 mode, the body is displayed for debugging purposes. */
900 skip_short_body (int fd, wgint contlen)
903 SKIP_SIZE = 512, /* size of the download buffer */
904 SKIP_THRESHOLD = 4096 /* the largest size we read */
906 char dlbuf[SKIP_SIZE + 1];
907 dlbuf[SKIP_SIZE] = '\0'; /* so DEBUGP can safely print it */
909 /* We shouldn't get here with unknown contlen. (This will change
910 with HTTP/1.1, which supports "chunked" transfer.) */
911 assert (contlen != -1);
913 /* If the body is too large, it makes more sense to simply close the
914 connection than to try to read the body. */
915 if (contlen > SKIP_THRESHOLD)
918 DEBUGP (("Skipping %s bytes of body: [", number_to_static_string (contlen)));
922 int ret = fd_read (fd, dlbuf, MIN (contlen, SKIP_SIZE), -1);
925 /* Don't normally report the error since this is an
926 optimization that should be invisible to the user. */
927 DEBUGP (("] aborting (%s).\n",
928 ret < 0 ? fd_errstr (fd) : "EOF received"));
932 /* Safe even if %.*s bogusly expects terminating \0 because
933 we've zero-terminated dlbuf above. */
934 DEBUGP (("%.*s", ret, dlbuf));
937 DEBUGP (("] done.\n"));
941 /* Extract a parameter from the string (typically an HTTP header) at
942 **SOURCE and advance SOURCE to the next parameter. Return false
943 when there are no more parameters to extract. The name of the
944 parameter is returned in NAME, and the value in VALUE. If the
945 parameter has no value, the token's value is zeroed out.
947 For example, if *SOURCE points to the string "attachment;
948 filename=\"foo bar\"", the first call to this function will return
949 the token named "attachment" and no value, and the second call will
950 return the token named "filename" and value "foo bar". The third
951 call will return false, indicating no more valid tokens. */
954 extract_param (const char **source, param_token *name, param_token *value,
957 const char *p = *source;
959 while (c_isspace (*p)) ++p;
963 return false; /* no error; nothing more to extract */
968 while (*p && !c_isspace (*p) && *p != '=' && *p != separator) ++p;
970 if (name->b == name->e)
971 return false; /* empty name: error */
972 while (c_isspace (*p)) ++p;
973 if (*p == separator || !*p) /* no value */
976 if (*p == separator) ++p;
981 return false; /* error */
983 /* *p is '=', extract value */
985 while (c_isspace (*p)) ++p;
986 if (*p == '"') /* quoted */
989 while (*p && *p != '"') ++p;
993 /* Currently at closing quote; find the end of param. */
994 while (c_isspace (*p)) ++p;
995 while (*p && *p != separator) ++p;
999 /* garbage after closed quote, e.g. foo="bar"baz */
1005 while (*p && *p != separator) ++p;
1007 while (value->e != value->b && c_isspace (value->e[-1]))
1009 if (*p == separator) ++p;
1016 #define MAX(p, q) ((p) > (q) ? (p) : (q))
1018 /* Parse the contents of the `Content-Disposition' header, extracting
1019 the information useful to Wget. Content-Disposition is a header
1020 borrowed from MIME; when used in HTTP, it typically serves for
1021 specifying the desired file name of the resource. For example:
1023 Content-Disposition: attachment; filename="flora.jpg"
1025 Wget will skip the tokens it doesn't care about, such as
1026 "attachment" in the previous example; it will also skip other
1027 unrecognized params. If the header is syntactically correct and
1028 contains a file name, a copy of the file name is stored in
1029 *filename and true is returned. Otherwise, the function returns
1032 The file name is stripped of directory components and must not be
1036 parse_content_disposition (const char *hdr, char **filename)
1038 param_token name, value;
1039 while (extract_param (&hdr, &name, &value, ';'))
1040 if (BOUNDED_EQUAL_NO_CASE (name.b, name.e, "filename") && value.b != NULL)
1042 /* Make the file name begin at the last slash or backslash. */
1043 const char *last_slash = memrchr (value.b, '/', value.e - value.b);
1044 const char *last_bs = memrchr (value.b, '\\', value.e - value.b);
1045 if (last_slash && last_bs)
1046 value.b = 1 + MAX (last_slash, last_bs);
1047 else if (last_slash || last_bs)
1048 value.b = 1 + (last_slash ? last_slash : last_bs);
1049 if (value.b == value.e)
1051 /* Start with the directory prefix, if specified. */
1054 int prefix_length = strlen (opt.dir_prefix);
1055 bool add_slash = (opt.dir_prefix[prefix_length - 1] != '/');
1060 total_length = prefix_length + (value.e - value.b);
1061 *filename = xmalloc (total_length + 1);
1062 strcpy (*filename, opt.dir_prefix);
1064 (*filename)[prefix_length - 1] = '/';
1065 memcpy (*filename + prefix_length, value.b, (value.e - value.b));
1066 (*filename)[total_length] = '\0';
1069 *filename = strdupdelim (value.b, value.e);
1075 /* Persistent connections. Currently, we cache the most recently used
1076 connection as persistent, provided that the HTTP server agrees to
1077 make it such. The persistence data is stored in the variables
1078 below. Ideally, it should be possible to cache an arbitrary fixed
1079 number of these connections. */
1081 /* Whether a persistent connection is active. */
1082 static bool pconn_active;
1085 /* The socket of the connection. */
1088 /* Host and port of the currently active persistent connection. */
1092 /* Whether a ssl handshake has occoured on this connection. */
1095 /* Whether the connection was authorized. This is only done by
1096 NTLM, which authorizes *connections* rather than individual
1097 requests. (That practice is peculiar for HTTP, but it is a
1098 useful optimization.) */
1102 /* NTLM data of the current connection. */
1103 struct ntlmdata ntlm;
1107 /* Mark the persistent connection as invalid and free the resources it
1108 uses. This is used by the CLOSE_* macros after they forcefully
1109 close a registered persistent connection. */
1112 invalidate_persistent (void)
1114 DEBUGP (("Disabling further reuse of socket %d.\n", pconn.socket));
1115 pconn_active = false;
1116 fd_close (pconn.socket);
1121 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
1122 persistent. This will enable someone to use the same connection
1123 later. In the context of HTTP, this must be called only AFTER the
1124 response has been received and the server has promised that the
1125 connection will remain alive.
1127 If a previous connection was persistent, it is closed. */
1130 register_persistent (const char *host, int port, int fd, bool ssl)
1134 if (pconn.socket == fd)
1136 /* The connection FD is already registered. */
1141 /* The old persistent connection is still active; close it
1142 first. This situation arises whenever a persistent
1143 connection exists, but we then connect to a different
1144 host, and try to register a persistent connection to that
1146 invalidate_persistent ();
1150 pconn_active = true;
1152 pconn.host = xstrdup (host);
1155 pconn.authorized = false;
1157 DEBUGP (("Registered socket %d for persistent reuse.\n", fd));
1160 /* Return true if a persistent connection is available for connecting
1164 persistent_available_p (const char *host, int port, bool ssl,
1165 bool *host_lookup_failed)
1167 /* First, check whether a persistent connection is active at all. */
1171 /* If we want SSL and the last connection wasn't or vice versa,
1172 don't use it. Checking for host and port is not enough because
1173 HTTP and HTTPS can apparently coexist on the same port. */
1174 if (ssl != pconn.ssl)
1177 /* If we're not connecting to the same port, we're not interested. */
1178 if (port != pconn.port)
1181 /* If the host is the same, we're in business. If not, there is
1182 still hope -- read below. */
1183 if (0 != strcasecmp (host, pconn.host))
1185 /* Check if pconn.socket is talking to HOST under another name.
1186 This happens often when both sites are virtual hosts
1187 distinguished only by name and served by the same network
1188 interface, and hence the same web server (possibly set up by
1189 the ISP and serving many different web sites). This
1190 admittedly unconventional optimization does not contradict
1191 HTTP and works well with popular server software. */
1195 struct address_list *al;
1198 /* Don't try to talk to two different SSL sites over the same
1199 secure connection! (Besides, it's not clear that
1200 name-based virtual hosting is even possible with SSL.) */
1203 /* If pconn.socket's peer is one of the IP addresses HOST
1204 resolves to, pconn.socket is for all intents and purposes
1205 already talking to HOST. */
1207 if (!socket_ip_address (pconn.socket, &ip, ENDPOINT_PEER))
1209 /* Can't get the peer's address -- something must be very
1210 wrong with the connection. */
1211 invalidate_persistent ();
1214 al = lookup_host (host, 0);
1217 *host_lookup_failed = true;
1221 found = address_list_contains (al, &ip);
1222 address_list_release (al);
1227 /* The persistent connection's peer address was found among the
1228 addresses HOST resolved to; therefore, pconn.sock is in fact
1229 already talking to HOST -- no need to reconnect. */
1232 /* Finally, check whether the connection is still open. This is
1233 important because most servers implement liberal (short) timeout
1234 on persistent connections. Wget can of course always reconnect
1235 if the connection doesn't work out, but it's nicer to know in
1236 advance. This test is a logical followup of the first test, but
1237 is "expensive" and therefore placed at the end of the list.
1239 (Current implementation of test_socket_open has a nice side
1240 effect that it treats sockets with pending data as "closed".
1241 This is exactly what we want: if a broken server sends message
1242 body in response to HEAD, or if it sends more than conent-length
1243 data, we won't reuse the corrupted connection.) */
1245 if (!test_socket_open (pconn.socket))
1247 /* Oops, the socket is no longer open. Now that we know that,
1248 let's invalidate the persistent connection before returning
1250 invalidate_persistent ();
1257 /* The idea behind these two CLOSE macros is to distinguish between
1258 two cases: one when the job we've been doing is finished, and we
1259 want to close the connection and leave, and two when something is
1260 seriously wrong and we're closing the connection as part of
1263 In case of keep_alive, CLOSE_FINISH should leave the connection
1264 open, while CLOSE_INVALIDATE should still close it.
1266 Note that the semantics of the flag `keep_alive' is "this
1267 connection *will* be reused (the server has promised not to close
1268 the connection once we're done)", while the semantics of
1269 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
1270 active, registered connection". */
1272 #define CLOSE_FINISH(fd) do { \
1275 if (pconn_active && (fd) == pconn.socket) \
1276 invalidate_persistent (); \
1285 #define CLOSE_INVALIDATE(fd) do { \
1286 if (pconn_active && (fd) == pconn.socket) \
1287 invalidate_persistent (); \
1295 wgint len; /* received length */
1296 wgint contlen; /* expected length */
1297 wgint restval; /* the restart value */
1298 int res; /* the result of last read */
1299 char *rderrmsg; /* error message from read error */
1300 char *newloc; /* new location (redirection) */
1301 char *remote_time; /* remote time-stamp string */
1302 char *error; /* textual HTTP error */
1303 int statcode; /* status code */
1304 char *message; /* status message */
1305 wgint rd_size; /* amount of data read from socket */
1306 double dltime; /* time it took to download the data */
1307 const char *referer; /* value of the referer header. */
1308 char *local_file; /* local file name. */
1309 bool existence_checked; /* true if we already checked for a file's
1310 existence after having begun to download
1311 (needed in gethttp for when connection is
1312 interrupted/restarted. */
1313 bool timestamp_checked; /* true if pre-download time-stamping checks
1314 * have already been performed */
1315 char *orig_file_name; /* name of file to compare for time-stamping
1316 * (might be != local_file if -K is set) */
1317 wgint orig_file_size; /* size of file to compare for time-stamping */
1318 time_t orig_file_tstamp; /* time-stamp of file to compare for
1323 free_hstat (struct http_stat *hs)
1325 xfree_null (hs->newloc);
1326 xfree_null (hs->remote_time);
1327 xfree_null (hs->error);
1328 xfree_null (hs->rderrmsg);
1329 xfree_null (hs->local_file);
1330 xfree_null (hs->orig_file_name);
1331 xfree_null (hs->message);
1333 /* Guard against being called twice. */
1335 hs->remote_time = NULL;
1339 #define BEGINS_WITH(line, string_constant) \
1340 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1341 && (c_isspace (line[sizeof (string_constant) - 1]) \
1342 || !line[sizeof (string_constant) - 1]))
1344 #define SET_USER_AGENT(req) do { \
1345 if (!opt.useragent) \
1346 request_set_header (req, "User-Agent", \
1347 aprintf ("Wget/%s", version_string), rel_value); \
1348 else if (*opt.useragent) \
1349 request_set_header (req, "User-Agent", opt.useragent, rel_none); \
1352 /* The flags that allow clobbering the file (opening with "wb").
1353 Defined here to avoid repetition later. #### This will require
1355 #define ALLOW_CLOBBER (opt.noclobber || opt.always_rest || opt.timestamping \
1356 || opt.dirstruct || opt.output_document)
1358 /* Retrieve a document through HTTP protocol. It recognizes status
1359 code, and correctly handles redirections. It closes the network
1360 socket. If it receives an error from the functions below it, it
1361 will print it if there is enough information to do so (almost
1362 always), returning the error to the caller (i.e. http_loop).
1364 Various HTTP parameters are stored to hs.
1366 If PROXY is non-NULL, the connection will be made to the proxy
1367 server, and u->url will be requested. */
1369 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
1371 struct request *req;
1374 char *user, *passwd;
1378 wgint contlen, contrange;
1385 /* Set to 1 when the authorization has already been sent and should
1386 not be tried again. */
1387 bool auth_finished = false;
1389 /* Set to 1 when just globally-set Basic authorization has been sent;
1390 * should prevent further Basic negotiations, but not other
1392 bool basic_auth_finished = false;
1394 /* Whether NTLM authentication is used for this request. */
1395 bool ntlm_seen = false;
1397 /* Whether our connection to the remote host is through SSL. */
1398 bool using_ssl = false;
1400 /* Whether a HEAD request will be issued (as opposed to GET or
1402 bool head_only = !!(*dt & HEAD_ONLY);
1405 struct response *resp;
1409 /* Whether this connection will be kept alive after the HTTP request
1413 /* Whether keep-alive should be inhibited.
1415 RFC 2068 requests that 1.0 clients not send keep-alive requests
1416 to proxies. This is because many 1.0 proxies do not interpret
1417 the Connection header and transfer it to the remote server,
1418 causing it to not close the connection and leave both the proxy
1419 and the client hanging. */
1420 bool inhibit_keep_alive =
1421 !opt.http_keep_alive || opt.ignore_length || proxy != NULL;
1423 /* Headers sent when using POST. */
1424 wgint post_data_size = 0;
1426 bool host_lookup_failed = false;
1429 if (u->scheme == SCHEME_HTTPS)
1431 /* Initialize the SSL context. After this has once been done,
1432 it becomes a no-op. */
1435 scheme_disable (SCHEME_HTTPS);
1436 logprintf (LOG_NOTQUIET,
1437 _("Disabling SSL due to encountered errors.\n"));
1438 return SSLINITFAILED;
1441 #endif /* HAVE_SSL */
1443 /* Initialize certain elements of struct http_stat. */
1447 hs->rderrmsg = NULL;
1449 hs->remote_time = NULL;
1455 /* Prepare the request to send. */
1457 req = request_new ();
1460 const char *meth = "GET";
1463 else if (opt.post_file_name || opt.post_data)
1465 /* Use the full path, i.e. one that includes the leading slash and
1466 the query string. E.g. if u->path is "foo/bar" and u->query is
1467 "param=value", full_path will be "/foo/bar?param=value". */
1470 /* When using SSL over proxy, CONNECT establishes a direct
1471 connection to the HTTPS server. Therefore use the same
1472 argument as when talking to the server directly. */
1473 && u->scheme != SCHEME_HTTPS
1476 meth_arg = xstrdup (u->url);
1478 meth_arg = url_full_path (u);
1479 request_set_method (req, meth, meth_arg);
1482 request_set_header (req, "Referer", (char *) hs->referer, rel_none);
1483 if (*dt & SEND_NOCACHE)
1484 request_set_header (req, "Pragma", "no-cache", rel_none);
1486 request_set_header (req, "Range",
1487 aprintf ("bytes=%s-",
1488 number_to_static_string (hs->restval)),
1490 SET_USER_AGENT (req);
1491 request_set_header (req, "Accept", "*/*", rel_none);
1493 /* Find the username and password for authentication. */
1496 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
1497 user = user ? user : (opt.http_user ? opt.http_user : opt.user);
1498 passwd = passwd ? passwd : (opt.http_passwd ? opt.http_passwd : opt.passwd);
1500 /* We only do "site-wide" authentication with "global" user/password
1501 * values unless --auth-no-challange has been requested; URL user/password
1502 * info overrides. */
1503 if (user && passwd && (!u->user || opt.auth_without_challenge))
1505 /* If this is a host for which we've already received a Basic
1506 * challenge, we'll go ahead and send Basic authentication creds. */
1507 basic_auth_finished = maybe_send_basic_creds(u->host, user, passwd, req);
1510 /* Generate the Host header, HOST:PORT. Take into account that:
1512 - Broken server-side software often doesn't recognize the PORT
1513 argument, so we must generate "Host: www.server.com" instead of
1514 "Host: www.server.com:80" (and likewise for https port).
1516 - IPv6 addresses contain ":", so "Host: 3ffe:8100:200:2::2:1234"
1517 becomes ambiguous and needs to be rewritten as "Host:
1518 [3ffe:8100:200:2::2]:1234". */
1520 /* Formats arranged for hfmt[add_port][add_squares]. */
1521 static const char *hfmt[][2] = {
1522 { "%s", "[%s]" }, { "%s:%d", "[%s]:%d" }
1524 int add_port = u->port != scheme_default_port (u->scheme);
1525 int add_squares = strchr (u->host, ':') != NULL;
1526 request_set_header (req, "Host",
1527 aprintf (hfmt[add_port][add_squares], u->host, u->port),
1531 if (!inhibit_keep_alive)
1532 request_set_header (req, "Connection", "Keep-Alive", rel_none);
1535 request_set_header (req, "Cookie",
1536 cookie_header (wget_cookie_jar,
1537 u->host, u->port, u->path,
1539 u->scheme == SCHEME_HTTPS
1546 if (opt.post_data || opt.post_file_name)
1548 request_set_header (req, "Content-Type",
1549 "application/x-www-form-urlencoded", rel_none);
1551 post_data_size = strlen (opt.post_data);
1554 post_data_size = file_size (opt.post_file_name);
1555 if (post_data_size == -1)
1557 logprintf (LOG_NOTQUIET, _("POST data file %s missing: %s\n"),
1558 quote (opt.post_file_name), strerror (errno));
1562 request_set_header (req, "Content-Length",
1563 xstrdup (number_to_static_string (post_data_size)),
1567 /* Add the user headers. */
1568 if (opt.user_headers)
1571 for (i = 0; opt.user_headers[i]; i++)
1572 request_set_user_header (req, opt.user_headers[i]);
1576 /* We need to come back here when the initial attempt to retrieve
1577 without authorization header fails. (Expected to happen at least
1578 for the Digest authorization scheme.) */
1583 char *proxy_user, *proxy_passwd;
1584 /* For normal username and password, URL components override
1585 command-line/wgetrc parameters. With proxy
1586 authentication, it's the reverse, because proxy URLs are
1587 normally the "permanent" ones, so command-line args
1588 should take precedence. */
1589 if (opt.proxy_user && opt.proxy_passwd)
1591 proxy_user = opt.proxy_user;
1592 proxy_passwd = opt.proxy_passwd;
1596 proxy_user = proxy->user;
1597 proxy_passwd = proxy->passwd;
1599 /* #### This does not appear right. Can't the proxy request,
1600 say, `Digest' authentication? */
1601 if (proxy_user && proxy_passwd)
1602 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd);
1604 /* If we're using a proxy, we will be connecting to the proxy
1608 /* Proxy authorization over SSL is handled below. */
1610 if (u->scheme != SCHEME_HTTPS)
1612 request_set_header (req, "Proxy-Authorization", proxyauth, rel_value);
1617 /* Establish the connection. */
1619 if (!inhibit_keep_alive)
1621 /* Look for a persistent connection to target host, unless a
1622 proxy is used. The exception is when SSL is in use, in which
1623 case the proxy is nothing but a passthrough to the target
1624 host, registered as a connection to the latter. */
1625 struct url *relevant = conn;
1627 if (u->scheme == SCHEME_HTTPS)
1631 if (persistent_available_p (relevant->host, relevant->port,
1633 relevant->scheme == SCHEME_HTTPS,
1637 &host_lookup_failed))
1639 sock = pconn.socket;
1640 using_ssl = pconn.ssl;
1641 logprintf (LOG_VERBOSE, _("Reusing existing connection to %s:%d.\n"),
1642 quotearg_style (escape_quoting_style, pconn.host),
1644 DEBUGP (("Reusing fd %d.\n", sock));
1645 if (pconn.authorized)
1646 /* If the connection is already authorized, the "Basic"
1647 authorization added by code above is unnecessary and
1649 request_remove_header (req, "Authorization");
1651 else if (host_lookup_failed)
1654 logprintf(LOG_NOTQUIET,
1655 _("%s: unable to resolve host address %s\n"),
1656 exec_name, quote (relevant->host));
1663 sock = connect_to_host (conn->host, conn->port);
1672 return (retryable_socket_connect_error (errno)
1673 ? CONERROR : CONIMPOSSIBLE);
1677 if (proxy && u->scheme == SCHEME_HTTPS)
1679 /* When requesting SSL URLs through proxies, use the
1680 CONNECT method to request passthrough. */
1681 struct request *connreq = request_new ();
1682 request_set_method (connreq, "CONNECT",
1683 aprintf ("%s:%d", u->host, u->port));
1684 SET_USER_AGENT (connreq);
1687 request_set_header (connreq, "Proxy-Authorization",
1688 proxyauth, rel_value);
1689 /* Now that PROXYAUTH is part of the CONNECT request,
1690 zero it out so we don't send proxy authorization with
1691 the regular request below. */
1694 /* Examples in rfc2817 use the Host header in CONNECT
1695 requests. I don't see how that gains anything, given
1696 that the contents of Host would be exactly the same as
1697 the contents of CONNECT. */
1699 write_error = request_send (connreq, sock);
1700 request_free (connreq);
1701 if (write_error < 0)
1703 CLOSE_INVALIDATE (sock);
1707 head = read_http_response_head (sock);
1710 logprintf (LOG_VERBOSE, _("Failed reading proxy response: %s\n"),
1712 CLOSE_INVALIDATE (sock);
1721 DEBUGP (("proxy responded with: [%s]\n", head));
1723 resp = resp_new (head);
1724 statcode = resp_status (resp, &message);
1725 hs->message = xstrdup (message);
1728 if (statcode != 200)
1731 logprintf (LOG_NOTQUIET, _("Proxy tunneling failed: %s"),
1732 message ? quotearg_style (escape_quoting_style, message) : "?");
1733 xfree_null (message);
1736 xfree_null (message);
1738 /* SOCK is now *really* connected to u->host, so update CONN
1739 to reflect this. That way register_persistent will
1740 register SOCK as being connected to u->host:u->port. */
1744 if (conn->scheme == SCHEME_HTTPS)
1746 if (!ssl_connect (sock) || !ssl_check_certificate (sock, u->host))
1753 #endif /* HAVE_SSL */
1756 /* Send the request to server. */
1757 write_error = request_send (req, sock);
1759 if (write_error >= 0)
1763 DEBUGP (("[POST data: %s]\n", opt.post_data));
1764 write_error = fd_write (sock, opt.post_data, post_data_size, -1);
1766 else if (opt.post_file_name && post_data_size != 0)
1767 write_error = post_file (sock, opt.post_file_name, post_data_size);
1770 if (write_error < 0)
1772 CLOSE_INVALIDATE (sock);
1776 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1777 proxy ? "Proxy" : "HTTP");
1782 head = read_http_response_head (sock);
1787 logputs (LOG_NOTQUIET, _("No data received.\n"));
1788 CLOSE_INVALIDATE (sock);
1794 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1796 CLOSE_INVALIDATE (sock);
1801 DEBUGP (("\n---response begin---\n%s---response end---\n", head));
1803 resp = resp_new (head);
1805 /* Check for status line. */
1807 statcode = resp_status (resp, &message);
1808 hs->message = xstrdup (message);
1809 if (!opt.server_response)
1810 logprintf (LOG_VERBOSE, "%2d %s\n", statcode,
1811 message ? quotearg_style (escape_quoting_style, message) : "");
1814 logprintf (LOG_VERBOSE, "\n");
1815 print_server_response (resp, " ");
1818 /* Check for keep-alive related responses. */
1819 if (!inhibit_keep_alive && contlen != -1)
1821 if (resp_header_copy (resp, "Keep-Alive", NULL, 0))
1823 else if (resp_header_copy (resp, "Connection", hdrval, sizeof (hdrval)))
1825 if (0 == strcasecmp (hdrval, "Keep-Alive"))
1831 /* The server has promised that it will not close the connection
1832 when we're done. This means that we can register it. */
1833 register_persistent (conn->host, conn->port, sock, using_ssl);
1835 if (statcode == HTTP_STATUS_UNAUTHORIZED)
1837 /* Authorization is required. */
1838 if (keep_alive && !head_only && skip_short_body (sock, contlen))
1839 CLOSE_FINISH (sock);
1841 CLOSE_INVALIDATE (sock);
1842 pconn.authorized = false;
1843 if (!auth_finished && (user && passwd))
1845 /* IIS sends multiple copies of WWW-Authenticate, one with
1846 the value "negotiate", and other(s) with data. Loop over
1847 all the occurrences and pick the one we recognize. */
1849 const char *wabeg, *waend;
1850 char *www_authenticate = NULL;
1852 (wapos = resp_header_locate (resp, "WWW-Authenticate", wapos,
1853 &wabeg, &waend)) != -1;
1855 if (known_authentication_scheme_p (wabeg, waend))
1857 BOUNDED_TO_ALLOCA (wabeg, waend, www_authenticate);
1861 if (!www_authenticate)
1863 /* If the authentication header is missing or
1864 unrecognized, there's no sense in retrying. */
1865 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1867 else if (!basic_auth_finished
1868 || !BEGINS_WITH (www_authenticate, "Basic"))
1871 pth = url_full_path (u);
1872 request_set_header (req, "Authorization",
1873 create_authorization_line (www_authenticate,
1875 request_method (req),
1879 if (BEGINS_WITH (www_authenticate, "NTLM"))
1881 else if (!u->user && BEGINS_WITH (www_authenticate, "Basic"))
1883 /* Need to register this host as using basic auth,
1884 * so we automatically send creds next time. */
1885 register_basic_auth_host (u->host);
1888 goto retry_with_auth;
1892 /* We already did Basic auth, and it failed. Gotta
1896 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1900 else /* statcode != HTTP_STATUS_UNAUTHORIZED */
1902 /* Kludge: if NTLM is used, mark the TCP connection as authorized. */
1904 pconn.authorized = true;
1907 /* Determine the local filename if needed. Notice that if -O is used
1908 * hstat.local_file is set by http_loop to the argument of -O. */
1909 if (!hs->local_file)
1911 /* Honor Content-Disposition whether possible. */
1912 if (!opt.content_disposition
1913 || !resp_header_copy (resp, "Content-Disposition",
1914 hdrval, sizeof (hdrval))
1915 || !parse_content_disposition (hdrval, &hs->local_file))
1917 /* The Content-Disposition header is missing or broken.
1918 * Choose unique file name according to given URL. */
1919 hs->local_file = url_file_name (u);
1923 /* TODO: perform this check only once. */
1924 if (!hs->existence_checked && file_exists_p (hs->local_file))
1926 if (opt.noclobber && !opt.output_document)
1928 /* If opt.noclobber is turned on and file already exists, do not
1929 retrieve the file. But if the output_document was given, then this
1930 test was already done and the file didn't exist. Hence the !opt.output_document */
1931 logprintf (LOG_VERBOSE, _("\
1932 File %s already there; not retrieving.\n\n"), quote (hs->local_file));
1933 /* If the file is there, we suppose it's retrieved OK. */
1936 /* #### Bogusness alert. */
1937 /* If its suffix is "html" or "htm" or similar, assume text/html. */
1938 if (has_html_suffix_p (hs->local_file))
1941 return RETRUNNEEDED;
1943 else if (!ALLOW_CLOBBER)
1945 char *unique = unique_name (hs->local_file, true);
1946 if (unique != hs->local_file)
1947 xfree (hs->local_file);
1948 hs->local_file = unique;
1951 hs->existence_checked = true;
1953 /* Support timestamping */
1954 /* TODO: move this code out of gethttp. */
1955 if (opt.timestamping && !hs->timestamp_checked)
1957 size_t filename_len = strlen (hs->local_file);
1958 char *filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1959 bool local_dot_orig_file_exists = false;
1960 char *local_filename = NULL;
1963 if (opt.backup_converted)
1964 /* If -K is specified, we'll act on the assumption that it was specified
1965 last time these files were downloaded as well, and instead of just
1966 comparing local file X against server file X, we'll compare local
1967 file X.orig (if extant, else X) against server file X. If -K
1968 _wasn't_ specified last time, or the server contains files called
1969 *.orig, -N will be back to not operating correctly with -k. */
1971 /* Would a single s[n]printf() call be faster? --dan
1973 Definitely not. sprintf() is horribly slow. It's a
1974 different question whether the difference between the two
1975 affects a program. Usually I'd say "no", but at one
1976 point I profiled Wget, and found that a measurable and
1977 non-negligible amount of time was lost calling sprintf()
1978 in url.c. Replacing sprintf with inline calls to
1979 strcpy() and number_to_string() made a difference.
1981 memcpy (filename_plus_orig_suffix, hs->local_file, filename_len);
1982 memcpy (filename_plus_orig_suffix + filename_len,
1983 ".orig", sizeof (".orig"));
1985 /* Try to stat() the .orig file. */
1986 if (stat (filename_plus_orig_suffix, &st) == 0)
1988 local_dot_orig_file_exists = true;
1989 local_filename = filename_plus_orig_suffix;
1993 if (!local_dot_orig_file_exists)
1994 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1995 if (stat (hs->local_file, &st) == 0)
1996 local_filename = hs->local_file;
1998 if (local_filename != NULL)
1999 /* There was a local file, so we'll check later to see if the version
2000 the server has is the same version we already have, allowing us to
2003 hs->orig_file_name = xstrdup (local_filename);
2004 hs->orig_file_size = st.st_size;
2005 hs->orig_file_tstamp = st.st_mtime;
2007 /* Modification time granularity is 2 seconds for Windows, so
2008 increase local time by 1 second for later comparison. */
2009 ++hs->orig_file_tstamp;
2014 if (!opt.ignore_length
2015 && resp_header_copy (resp, "Content-Length", hdrval, sizeof (hdrval)))
2019 parsed = str_to_wgint (hdrval, NULL, 10);
2020 if (parsed == WGINT_MAX && errno == ERANGE)
2023 #### If Content-Length is out of range, it most likely
2024 means that the file is larger than 2G and that we're
2025 compiled without LFS. In that case we should probably
2026 refuse to even attempt to download the file. */
2029 else if (parsed < 0)
2031 /* Negative Content-Length; nonsensical, so we can't
2032 assume any information about the content to receive. */
2041 hs->statcode = statcode;
2043 hs->error = xstrdup (_("Malformed status line"));
2045 hs->error = xstrdup (_("(no description)"));
2047 hs->error = xstrdup (message);
2048 xfree_null (message);
2050 type = resp_header_strdup (resp, "Content-Type");
2053 char *tmp = strchr (type, ';');
2056 while (tmp > type && c_isspace (tmp[-1]))
2061 hs->newloc = resp_header_strdup (resp, "Location");
2062 hs->remote_time = resp_header_strdup (resp, "Last-Modified");
2064 /* Handle (possibly multiple instances of) the Set-Cookie header. */
2068 const char *scbeg, *scend;
2069 /* The jar should have been created by now. */
2070 assert (wget_cookie_jar != NULL);
2072 (scpos = resp_header_locate (resp, "Set-Cookie", scpos,
2073 &scbeg, &scend)) != -1;
2076 char *set_cookie; BOUNDED_TO_ALLOCA (scbeg, scend, set_cookie);
2077 cookie_handle_set_cookie (wget_cookie_jar, u->host, u->port,
2078 u->path, set_cookie);
2082 if (resp_header_copy (resp, "Content-Range", hdrval, sizeof (hdrval)))
2084 wgint first_byte_pos, last_byte_pos, entity_length;
2085 if (parse_content_range (hdrval, &first_byte_pos, &last_byte_pos,
2088 contrange = first_byte_pos;
2089 contlen = last_byte_pos - first_byte_pos + 1;
2094 /* 20x responses are counted among successful by default. */
2095 if (H_20X (statcode))
2098 /* Return if redirected. */
2099 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
2101 /* RFC2068 says that in case of the 300 (multiple choices)
2102 response, the server can output a preferred URL through
2103 `Location' header; otherwise, the request should be treated
2104 like GET. So, if the location is set, it will be a
2105 redirection; otherwise, just proceed normally. */
2106 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
2110 logprintf (LOG_VERBOSE,
2111 _("Location: %s%s\n"),
2112 hs->newloc ? escnonprint_uri (hs->newloc) : _("unspecified"),
2113 hs->newloc ? _(" [following]") : "");
2114 if (keep_alive && !head_only && skip_short_body (sock, contlen))
2115 CLOSE_FINISH (sock);
2117 CLOSE_INVALIDATE (sock);
2123 /* If content-type is not given, assume text/html. This is because
2124 of the multitude of broken CGI's that "forget" to generate the
2127 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) ||
2128 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S)))
2134 0 == strncasecmp (type, TEXTCSS_S, strlen (TEXTCSS_S)))
2139 if (opt.html_extension)
2142 /* -E / --html-extension / html_extension = on was specified,
2143 and this is a text/html file. If some case-insensitive
2144 variation on ".htm[l]" isn't already the file's suffix,
2147 ensure_extension (hs, ".html", dt);
2149 else if (*dt & TEXTCSS)
2151 ensure_extension (hs, ".css", dt);
2155 if (statcode == HTTP_STATUS_RANGE_NOT_SATISFIABLE
2156 || (hs->restval > 0 && statcode == HTTP_STATUS_OK
2157 && contrange == 0 && hs->restval >= contlen)
2160 /* If `-c' is in use and the file has been fully downloaded (or
2161 the remote file has shrunk), Wget effectively requests bytes
2162 after the end of file and the server response with 416
2163 (or 200 with a <= Content-Length. */
2164 logputs (LOG_VERBOSE, _("\
2165 \n The file is already fully retrieved; nothing to do.\n\n"));
2166 /* In case the caller inspects. */
2169 /* Mark as successfully retrieved. */
2172 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
2173 might be more bytes in the body. */
2174 return RETRUNNEEDED;
2176 if ((contrange != 0 && contrange != hs->restval)
2177 || (H_PARTIAL (statcode) && !contrange))
2179 /* The Range request was somehow misunderstood by the server.
2182 CLOSE_INVALIDATE (sock);
2188 hs->contlen = contlen + contrange;
2194 /* No need to print this output if the body won't be
2195 downloaded at all, or if the original server response is
2197 logputs (LOG_VERBOSE, _("Length: "));
2200 logputs (LOG_VERBOSE, number_to_static_string (contlen + contrange));
2201 if (contlen + contrange >= 1024)
2202 logprintf (LOG_VERBOSE, " (%s)",
2203 human_readable (contlen + contrange));
2206 if (contlen >= 1024)
2207 logprintf (LOG_VERBOSE, _(", %s (%s) remaining"),
2208 number_to_static_string (contlen),
2209 human_readable (contlen));
2211 logprintf (LOG_VERBOSE, _(", %s remaining"),
2212 number_to_static_string (contlen));
2216 logputs (LOG_VERBOSE,
2217 opt.ignore_length ? _("ignored") : _("unspecified"));
2219 logprintf (LOG_VERBOSE, " [%s]\n", quotearg_style (escape_quoting_style, type));
2221 logputs (LOG_VERBOSE, "\n");
2225 type = NULL; /* We don't need it any more. */
2227 /* Return if we have no intention of further downloading. */
2228 if (!(*dt & RETROKF) || head_only)
2230 /* In case the caller cares to look... */
2235 /* Pre-1.10 Wget used CLOSE_INVALIDATE here. Now we trust the
2236 servers not to send body in response to a HEAD request, and
2237 those that do will likely be caught by test_socket_open.
2238 If not, they can be worked around using
2239 `--no-http-keep-alive'. */
2240 CLOSE_FINISH (sock);
2241 else if (keep_alive && skip_short_body (sock, contlen))
2242 /* Successfully skipped the body; also keep using the socket. */
2243 CLOSE_FINISH (sock);
2245 CLOSE_INVALIDATE (sock);
2246 return RETRFINISHED;
2249 /* Open the local file. */
2252 mkalldirs (hs->local_file);
2254 rotate_backups (hs->local_file);
2256 fp = fopen (hs->local_file, "ab");
2257 else if (ALLOW_CLOBBER)
2258 fp = fopen (hs->local_file, "wb");
2261 fp = fopen_excl (hs->local_file, true);
2262 if (!fp && errno == EEXIST)
2264 /* We cannot just invent a new name and use it (which is
2265 what functions like unique_create typically do)
2266 because we told the user we'd use this name.
2267 Instead, return and retry the download. */
2268 logprintf (LOG_NOTQUIET,
2269 _("%s has sprung into existence.\n"),
2271 CLOSE_INVALIDATE (sock);
2272 return FOPEN_EXCL_ERR;
2277 logprintf (LOG_NOTQUIET, "%s: %s\n", hs->local_file, strerror (errno));
2278 CLOSE_INVALIDATE (sock);
2285 /* Print fetch message, if opt.verbose. */
2288 logprintf (LOG_NOTQUIET, _("Saving to: %s\n"),
2289 HYPHENP (hs->local_file) ? quote ("STDOUT") : quote (hs->local_file));
2292 /* This confuses the timestamping code that checks for file size.
2293 #### The timestamping code should be smarter about file size. */
2294 if (opt.save_headers && hs->restval == 0)
2295 fwrite (head, 1, strlen (head), fp);
2297 /* Now we no longer need to store the response header. */
2300 /* Download the request body. */
2303 /* If content-length is present, read that much; otherwise, read
2304 until EOF. The HTTP spec doesn't require the server to
2305 actually close the connection when it's done sending data. */
2306 flags |= rb_read_exactly;
2307 if (hs->restval > 0 && contrange == 0)
2308 /* If the server ignored our range request, instruct fd_read_body
2309 to skip the first RESTVAL bytes of body. */
2310 flags |= rb_skip_startpos;
2311 hs->len = hs->restval;
2313 hs->res = fd_read_body (sock, fp, contlen != -1 ? contlen : 0,
2314 hs->restval, &hs->rd_size, &hs->len, &hs->dltime,
2318 CLOSE_FINISH (sock);
2322 hs->rderrmsg = xstrdup (fd_errstr (sock));
2323 CLOSE_INVALIDATE (sock);
2330 return RETRFINISHED;
2333 /* The genuine HTTP loop! This is the part where the retrieval is
2334 retried, and retried, and retried, and... */
2336 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
2337 int *dt, struct url *proxy)
2340 bool got_head = false; /* used for time-stamping and filename detection */
2341 bool time_came_from_head = false;
2342 bool got_name = false;
2345 uerr_t err, ret = TRYLIMEXC;
2346 time_t tmr = -1; /* remote time-stamp */
2347 struct http_stat hstat; /* HTTP status */
2349 bool send_head_first = true;
2351 /* Assert that no value for *LOCAL_FILE was passed. */
2352 assert (local_file == NULL || *local_file == NULL);
2354 /* Set LOCAL_FILE parameter. */
2355 if (local_file && opt.output_document)
2356 *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document);
2358 /* Reset NEWLOC parameter. */
2361 /* This used to be done in main(), but it's a better idea to do it
2362 here so that we don't go through the hoops if we're just using
2367 /* Warn on (likely bogus) wildcard usage in HTTP. */
2368 if (opt.ftp_glob && has_wildcards_p (u->path))
2369 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
2371 /* Setup hstat struct. */
2373 hstat.referer = referer;
2375 if (opt.output_document)
2377 hstat.local_file = xstrdup (opt.output_document);
2380 else if (!opt.content_disposition)
2382 hstat.local_file = url_file_name (u);
2386 /* TODO: Ick! This code is now in both gethttp and http_loop, and is
2387 * screaming for some refactoring. */
2388 if (got_name && file_exists_p (hstat.local_file) && opt.noclobber && !opt.output_document)
2390 /* If opt.noclobber is turned on and file already exists, do not
2391 retrieve the file. But if the output_document was given, then this
2392 test was already done and the file didn't exist. Hence the !opt.output_document */
2393 logprintf (LOG_VERBOSE, _("\
2394 File %s already there; not retrieving.\n\n"),
2395 quote (hstat.local_file));
2396 /* If the file is there, we suppose it's retrieved OK. */
2399 /* #### Bogusness alert. */
2400 /* If its suffix is "html" or "htm" or similar, assume text/html. */
2401 if (has_html_suffix_p (hstat.local_file))
2408 /* Reset the counter. */
2411 /* Reset the document type. */
2414 /* Skip preliminary HEAD request if we're not in spider mode AND
2415 * if -O was given or HTTP Content-Disposition support is disabled. */
2417 && (got_name || !opt.content_disposition))
2418 send_head_first = false;
2420 /* Send preliminary HEAD request if -N is given and we have an existing
2421 * destination file. */
2422 if (opt.timestamping
2423 && !opt.content_disposition
2424 && file_exists_p (url_file_name (u)))
2425 send_head_first = true;
2430 /* Increment the pass counter. */
2432 sleep_between_retrievals (count);
2434 /* Get the current time string. */
2435 tms = datetime_str (time (NULL));
2437 if (opt.spider && !got_head)
2438 logprintf (LOG_VERBOSE, _("\
2439 Spider mode enabled. Check if remote file exists.\n"));
2441 /* Print fetch message, if opt.verbose. */
2444 char *hurl = url_string (u, URL_AUTH_HIDE_PASSWD);
2449 sprintf (tmp, _("(try:%2d)"), count);
2450 logprintf (LOG_NOTQUIET, "--%s-- %s %s\n",
2455 logprintf (LOG_NOTQUIET, "--%s-- %s\n",
2460 ws_changetitle (hurl);
2465 /* Default document type is empty. However, if spider mode is
2466 on or time-stamping is employed, HEAD_ONLY commands is
2467 encoded within *dt. */
2468 if (send_head_first && !got_head)
2473 /* Decide whether or not to restart. */
2476 && stat (hstat.local_file, &st) == 0
2477 && S_ISREG (st.st_mode))
2478 /* When -c is used, continue from on-disk size. (Can't use
2479 hstat.len even if count>1 because we don't want a failed
2480 first attempt to clobber existing data.) */
2481 hstat.restval = st.st_size;
2483 /* otherwise, continue where the previous try left off */
2484 hstat.restval = hstat.len;
2488 /* Decide whether to send the no-cache directive. We send it in
2490 a) we're using a proxy, and we're past our first retrieval.
2491 Some proxies are notorious for caching incomplete data, so
2492 we require a fresh get.
2493 b) caching is explicitly inhibited. */
2494 if ((proxy && count > 1) /* a */
2495 || !opt.allow_cache) /* b */
2496 *dt |= SEND_NOCACHE;
2498 *dt &= ~SEND_NOCACHE;
2500 /* Try fetching the document, or at least its head. */
2501 err = gethttp (u, &hstat, dt, proxy);
2504 tms = datetime_str (time (NULL));
2506 /* Get the new location (with or without the redirection). */
2508 *newloc = xstrdup (hstat.newloc);
2512 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
2513 case CONERROR: case READERR: case WRITEFAILED:
2514 case RANGEERR: case FOPEN_EXCL_ERR:
2515 /* Non-fatal errors continue executing the loop, which will
2516 bring them to "while" statement at the end, to judge
2517 whether the number of tries was exceeded. */
2518 printwhat (count, opt.ntry);
2520 case FWRITEERR: case FOPENERR:
2521 /* Another fatal error. */
2522 logputs (LOG_VERBOSE, "\n");
2523 logprintf (LOG_NOTQUIET, _("Cannot write to %s (%s).\n"),
2524 quote (hstat.local_file), strerror (errno));
2525 case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED:
2526 case SSLINITFAILED: case CONTNOTSUPPORTED:
2527 /* Fatal errors just return from the function. */
2531 /* Another fatal error. */
2532 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
2536 /* Return the new location to the caller. */
2539 logprintf (LOG_NOTQUIET,
2540 _("ERROR: Redirection (%d) without location.\n"),
2550 /* The file was already fully retrieved. */
2554 /* Deal with you later. */
2557 /* All possibilities should have been exhausted. */
2561 if (!(*dt & RETROKF))
2566 /* #### Ugly ugly ugly! */
2567 hurl = url_string (u, URL_AUTH_HIDE_PASSWD);
2568 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
2571 /* Fall back to GET if HEAD fails with a 500 or 501 error code. */
2573 && (hstat.statcode == 500 || hstat.statcode == 501))
2578 /* Maybe we should always keep track of broken links, not just in
2580 else if (opt.spider)
2582 /* #### Again: ugly ugly ugly! */
2584 hurl = url_string (u, URL_AUTH_HIDE_PASSWD);
2585 nonexisting_url (hurl);
2586 logprintf (LOG_NOTQUIET, _("\
2587 Remote file does not exist -- broken link!!!\n"));
2591 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
2592 tms, hstat.statcode,
2593 quotearg_style (escape_quoting_style, hstat.error));
2595 logputs (LOG_VERBOSE, "\n");
2601 /* Did we get the time-stamp? */
2604 got_head = true; /* no more time-stamping */
2606 if (opt.timestamping && !hstat.remote_time)
2608 logputs (LOG_NOTQUIET, _("\
2609 Last-modified header missing -- time-stamps turned off.\n"));
2611 else if (hstat.remote_time)
2613 /* Convert the date-string into struct tm. */
2614 tmr = http_atotm (hstat.remote_time);
2615 if (tmr == (time_t) (-1))
2616 logputs (LOG_VERBOSE, _("\
2617 Last-modified header invalid -- time-stamp ignored.\n"));
2618 if (*dt & HEAD_ONLY)
2619 time_came_from_head = true;
2622 if (send_head_first)
2624 /* The time-stamping section. */
2625 if (opt.timestamping)
2627 if (hstat.orig_file_name) /* Perform the following
2628 checks only if the file
2630 download already exists. */
2632 if (hstat.remote_time &&
2633 tmr != (time_t) (-1))
2635 /* Now time-stamping can be used validly.
2636 Time-stamping means that if the sizes of
2637 the local and remote file match, and local
2638 file is newer than the remote file, it will
2639 not be retrieved. Otherwise, the normal
2640 download procedure is resumed. */
2641 if (hstat.orig_file_tstamp >= tmr)
2643 if (hstat.contlen == -1
2644 || hstat.orig_file_size == hstat.contlen)
2646 logprintf (LOG_VERBOSE, _("\
2647 Server file no newer than local file %s -- not retrieving.\n\n"),
2648 quote (hstat.orig_file_name));
2654 logprintf (LOG_VERBOSE, _("\
2655 The sizes do not match (local %s) -- retrieving.\n"),
2656 number_to_static_string (hstat.orig_file_size));
2660 logputs (LOG_VERBOSE,
2661 _("Remote file is newer, retrieving.\n"));
2663 logputs (LOG_VERBOSE, "\n");
2667 /* free_hstat (&hstat); */
2668 hstat.timestamp_checked = true;
2673 bool finished = true;
2678 logputs (LOG_VERBOSE, _("\
2679 Remote file exists and could contain links to other resources -- retrieving.\n\n"));
2684 logprintf (LOG_VERBOSE, _("\
2685 Remote file exists but does not contain any link -- not retrieving.\n\n"));
2686 ret = RETROK; /* RETRUNNEEDED is not for caller. */
2693 logprintf (LOG_VERBOSE, _("\
2694 Remote file exists and could contain further links,\n\
2695 but recursion is disabled -- not retrieving.\n\n"));
2699 logprintf (LOG_VERBOSE, _("\
2700 Remote file exists.\n\n"));
2702 ret = RETROK; /* RETRUNNEEDED is not for caller. */
2707 logprintf (LOG_NONVERBOSE,
2708 _("%s URL:%s %2d %s\n"),
2709 tms, u->url, hstat.statcode,
2710 hstat.message ? quotearg_style (escape_quoting_style, hstat.message) : "");
2717 count = 0; /* the retrieve count for HEAD is reset */
2719 } /* send_head_first */
2722 if ((tmr != (time_t) (-1))
2723 && ((hstat.len == hstat.contlen) ||
2724 ((hstat.res == 0) && (hstat.contlen == -1))))
2726 /* #### This code repeats in http.c and ftp.c. Move it to a
2728 const char *fl = NULL;
2729 if (opt.output_document)
2731 if (output_stream_regular)
2732 fl = opt.output_document;
2735 fl = hstat.local_file;
2739 /* Reparse time header, in case it's changed. */
2740 if (time_came_from_head
2741 && hstat.remote_time && hstat.remote_time[0])
2743 newtmr = http_atotm (hstat.remote_time);
2750 /* End of time-stamping section. */
2752 tmrate = retr_rate (hstat.rd_size, hstat.dltime);
2753 total_download_time += hstat.dltime;
2755 if (hstat.len == hstat.contlen)
2759 logprintf (LOG_VERBOSE,
2760 _("%s (%s) - %s saved [%s/%s]\n\n"),
2761 tms, tmrate, quote (hstat.local_file),
2762 number_to_static_string (hstat.len),
2763 number_to_static_string (hstat.contlen));
2764 logprintf (LOG_NONVERBOSE,
2765 "%s URL:%s [%s/%s] -> \"%s\" [%d]\n",
2767 number_to_static_string (hstat.len),
2768 number_to_static_string (hstat.contlen),
2769 hstat.local_file, count);
2772 total_downloaded_bytes += hstat.len;
2774 /* Remember that we downloaded the file for later ".orig" code. */
2775 if (*dt & ADDED_HTML_EXTENSION)
2776 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, hstat.local_file);
2778 downloaded_file(FILE_DOWNLOADED_NORMALLY, hstat.local_file);
2783 else if (hstat.res == 0) /* No read error */
2785 if (hstat.contlen == -1) /* We don't know how much we were supposed
2786 to get, so assume we succeeded. */
2790 logprintf (LOG_VERBOSE,
2791 _("%s (%s) - %s saved [%s]\n\n"),
2792 tms, tmrate, quote (hstat.local_file),
2793 number_to_static_string (hstat.len));
2794 logprintf (LOG_NONVERBOSE,
2795 "%s URL:%s [%s] -> \"%s\" [%d]\n",
2796 tms, u->url, number_to_static_string (hstat.len),
2797 hstat.local_file, count);
2800 total_downloaded_bytes += hstat.len;
2802 /* Remember that we downloaded the file for later ".orig" code. */
2803 if (*dt & ADDED_HTML_EXTENSION)
2804 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, hstat.local_file);
2806 downloaded_file(FILE_DOWNLOADED_NORMALLY, hstat.local_file);
2811 else if (hstat.len < hstat.contlen) /* meaning we lost the
2812 connection too soon */
2814 logprintf (LOG_VERBOSE,
2815 _("%s (%s) - Connection closed at byte %s. "),
2816 tms, tmrate, number_to_static_string (hstat.len));
2817 printwhat (count, opt.ntry);
2820 else if (hstat.len != hstat.restval)
2821 /* Getting here would mean reading more data than
2822 requested with content-length, which we never do. */
2826 /* Getting here probably means that the content-length was
2827 * _less_ than the original, local size. We should probably
2828 * truncate or re-read, or something. FIXME */
2833 else /* from now on hstat.res can only be -1 */
2835 if (hstat.contlen == -1)
2837 logprintf (LOG_VERBOSE,
2838 _("%s (%s) - Read error at byte %s (%s)."),
2839 tms, tmrate, number_to_static_string (hstat.len),
2841 printwhat (count, opt.ntry);
2844 else /* hstat.res == -1 and contlen is given */
2846 logprintf (LOG_VERBOSE,
2847 _("%s (%s) - Read error at byte %s/%s (%s). "),
2849 number_to_static_string (hstat.len),
2850 number_to_static_string (hstat.contlen),
2852 printwhat (count, opt.ntry);
2858 while (!opt.ntry || (count < opt.ntry));
2862 *local_file = xstrdup (hstat.local_file);
2863 free_hstat (&hstat);
2868 /* Check whether the result of strptime() indicates success.
2869 strptime() returns the pointer to how far it got to in the string.
2870 The processing has been successful if the string is at `GMT' or
2871 `+X', or at the end of the string.
2873 In extended regexp parlance, the function returns 1 if P matches
2874 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2875 can return) is considered a failure and 0 is returned. */
2877 check_end (const char *p)
2881 while (c_isspace (*p))
2884 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2885 || ((p[0] == '+' || p[0] == '-') && c_isdigit (p[1])))
2891 /* Convert the textual specification of time in TIME_STRING to the
2892 number of seconds since the Epoch.
2894 TIME_STRING can be in any of the three formats RFC2616 allows the
2895 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date,
2896 as well as the time format used in the Set-Cookie header.
2897 Timezones are ignored, and should be GMT.
2899 Return the computed time_t representation, or -1 if the conversion
2902 This function uses strptime with various string formats for parsing
2903 TIME_STRING. This results in a parser that is not as lenient in
2904 interpreting TIME_STRING as I would like it to be. Being based on
2905 strptime, it always allows shortened months, one-digit days, etc.,
2906 but due to the multitude of formats in which time can be
2907 represented, an ideal HTTP time parser would be even more
2908 forgiving. It should completely ignore things like week days and
2909 concentrate only on the various forms of representing years,
2910 months, days, hours, minutes, and seconds. For example, it would
2911 be nice if it accepted ISO 8601 out of the box.
2913 I've investigated free and PD code for this purpose, but none was
2914 usable. getdate was big and unwieldy, and had potential copyright
2915 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2916 distributed with phttpd, is excellent, but we cannot use it because
2917 it is not assigned to the FSF. So I stuck it with strptime. */
2920 http_atotm (const char *time_string)
2922 /* NOTE: Solaris strptime man page claims that %n and %t match white
2923 space, but that's not universally available. Instead, we simply
2924 use ` ' to mean "skip all WS", which works under all strptime
2925 implementations I've tested. */
2927 static const char *time_formats[] = {
2928 "%a, %d %b %Y %T", /* rfc1123: Thu, 29 Jan 1998 22:12:57 */
2929 "%A, %d-%b-%y %T", /* rfc850: Thursday, 29-Jan-98 22:12:57 */
2930 "%a %b %d %T %Y", /* asctime: Thu Jan 29 22:12:57 1998 */
2931 "%a, %d-%b-%Y %T" /* cookies: Thu, 29-Jan-1998 22:12:57
2932 (used in Set-Cookie, defined in the
2933 Netscape cookie specification.) */
2935 const char *oldlocale;
2937 time_t ret = (time_t) -1;
2939 /* Solaris strptime fails to recognize English month names in
2940 non-English locales, which we work around by temporarily setting
2941 locale to C before invoking strptime. */
2942 oldlocale = setlocale (LC_TIME, NULL);
2943 setlocale (LC_TIME, "C");
2945 for (i = 0; i < countof (time_formats); i++)
2949 /* Some versions of strptime use the existing contents of struct
2950 tm to recalculate the date according to format. Zero it out
2951 to prevent stack garbage from influencing strptime. */
2954 if (check_end (strptime (time_string, time_formats[i], &t)))
2961 /* Restore the previous locale. */
2962 setlocale (LC_TIME, oldlocale);
2967 /* Authorization support: We support three authorization schemes:
2969 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2971 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2972 consisting of answering to the server's challenge with the proper
2975 * `NTLM' ("NT Lan Manager") scheme, based on code written by Daniel
2976 Stenberg for libcurl. Like digest, NTLM is based on a
2977 challenge-response mechanism, but unlike digest, it is non-standard
2978 (authenticates TCP connections rather than requests), undocumented
2979 and Microsoft-specific. */
2981 /* Create the authentication header contents for the `Basic' scheme.
2982 This is done by encoding the string "USER:PASS" to base64 and
2983 prepending the string "Basic " in front of it. */
2986 basic_authentication_encode (const char *user, const char *passwd)
2989 int len1 = strlen (user) + 1 + strlen (passwd);
2991 t1 = (char *)alloca (len1 + 1);
2992 sprintf (t1, "%s:%s", user, passwd);
2994 t2 = (char *)alloca (BASE64_LENGTH (len1) + 1);
2995 base64_encode (t1, len1, t2);
2997 return concat_strings ("Basic ", t2, (char *) 0);
3000 #define SKIP_WS(x) do { \
3001 while (c_isspace (*(x))) \
3005 #ifdef ENABLE_DIGEST
3006 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
3007 an array of 16 bytes containing the hash keys, and BUF should be a
3008 buffer of 33 writable characters (32 for hex digits plus one for
3009 zero termination). */
3011 dump_hash (char *buf, const unsigned char *hash)
3015 for (i = 0; i < MD5_HASHLEN; i++, hash++)
3017 *buf++ = XNUM_TO_digit (*hash >> 4);
3018 *buf++ = XNUM_TO_digit (*hash & 0xf);
3023 /* Take the line apart to find the challenge, and compose a digest
3024 authorization header. See RFC2069 section 2.1.2. */
3026 digest_authentication_encode (const char *au, const char *user,
3027 const char *passwd, const char *method,
3030 static char *realm, *opaque, *nonce;
3035 { "realm", &realm },
3036 { "opaque", &opaque },
3040 param_token name, value;
3042 realm = opaque = nonce = NULL;
3044 au += 6; /* skip over `Digest' */
3045 while (extract_param (&au, &name, &value, ','))
3048 size_t namelen = name.e - name.b;
3049 for (i = 0; i < countof (options); i++)
3050 if (namelen == strlen (options[i].name)
3051 && 0 == strncmp (name.b, options[i].name,
3054 *options[i].variable = strdupdelim (value.b, value.e);
3058 if (!realm || !nonce || !user || !passwd || !path || !method)
3061 xfree_null (opaque);
3066 /* Calculate the digest value. */
3068 ALLOCA_MD5_CONTEXT (ctx);
3069 unsigned char hash[MD5_HASHLEN];
3070 char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
3071 char response_digest[MD5_HASHLEN * 2 + 1];
3073 /* A1BUF = H(user ":" realm ":" password) */
3075 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
3076 gen_md5_update ((unsigned char *)":", 1, ctx);
3077 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
3078 gen_md5_update ((unsigned char *)":", 1, ctx);
3079 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
3080 gen_md5_finish (ctx, hash);
3081 dump_hash (a1buf, hash);
3083 /* A2BUF = H(method ":" path) */
3085 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
3086 gen_md5_update ((unsigned char *)":", 1, ctx);
3087 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
3088 gen_md5_finish (ctx, hash);
3089 dump_hash (a2buf, hash);
3091 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
3093 gen_md5_update ((unsigned char *)a1buf, MD5_HASHLEN * 2, ctx);
3094 gen_md5_update ((unsigned char *)":", 1, ctx);
3095 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
3096 gen_md5_update ((unsigned char *)":", 1, ctx);
3097 gen_md5_update ((unsigned char *)a2buf, MD5_HASHLEN * 2, ctx);
3098 gen_md5_finish (ctx, hash);
3099 dump_hash (response_digest, hash);
3101 res = xmalloc (strlen (user)
3106 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
3107 + (opaque ? strlen (opaque) : 0)
3109 sprintf (res, "Digest \
3110 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
3111 user, realm, nonce, path, response_digest);
3114 char *p = res + strlen (res);
3115 strcat (p, ", opaque=\"");
3122 #endif /* ENABLE_DIGEST */
3124 /* Computing the size of a string literal must take into account that
3125 value returned by sizeof includes the terminating \0. */
3126 #define STRSIZE(literal) (sizeof (literal) - 1)
3128 /* Whether chars in [b, e) begin with the literal string provided as
3129 first argument and are followed by whitespace or terminating \0.
3130 The comparison is case-insensitive. */
3131 #define STARTS(literal, b, e) \
3133 && ((size_t) ((e) - (b))) >= STRSIZE (literal) \
3134 && 0 == strncasecmp (b, literal, STRSIZE (literal)) \
3135 && ((size_t) ((e) - (b)) == STRSIZE (literal) \
3136 || c_isspace (b[STRSIZE (literal)])))
3139 known_authentication_scheme_p (const char *hdrbeg, const char *hdrend)
3141 return STARTS ("Basic", hdrbeg, hdrend)
3142 #ifdef ENABLE_DIGEST
3143 || STARTS ("Digest", hdrbeg, hdrend)
3146 || STARTS ("NTLM", hdrbeg, hdrend)
3153 /* Create the HTTP authorization request header. When the
3154 `WWW-Authenticate' response header is seen, according to the
3155 authorization scheme specified in that header (`Basic' and `Digest'
3156 are supported by the current implementation), produce an
3157 appropriate HTTP authorization request header. */
3159 create_authorization_line (const char *au, const char *user,
3160 const char *passwd, const char *method,
3161 const char *path, bool *finished)
3163 /* We are called only with known schemes, so we can dispatch on the
3165 switch (c_toupper (*au))
3167 case 'B': /* Basic */
3169 return basic_authentication_encode (user, passwd);
3170 #ifdef ENABLE_DIGEST
3171 case 'D': /* Digest */
3173 return digest_authentication_encode (au, user, passwd, method, path);
3176 case 'N': /* NTLM */
3177 if (!ntlm_input (&pconn.ntlm, au))
3182 return ntlm_output (&pconn.ntlm, user, passwd, finished);
3185 /* We shouldn't get here -- this function should be only called
3186 with values approved by known_authentication_scheme_p. */
3194 if (!wget_cookie_jar)
3195 wget_cookie_jar = cookie_jar_new ();
3196 if (opt.cookies_input && !cookies_loaded_p)
3198 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
3199 cookies_loaded_p = true;
3206 if (wget_cookie_jar)
3207 cookie_jar_save (wget_cookie_jar, opt.cookies_output);
3213 xfree_null (pconn.host);
3214 if (wget_cookie_jar)
3215 cookie_jar_delete (wget_cookie_jar);
3219 ensure_extension (struct http_stat *hs, const char *ext, int *dt)
3221 char *last_period_in_local_filename = strrchr (hs->local_file, '.');
3223 int len = strlen (ext);
3226 strncpy (shortext, ext, len - 1);
3227 shortext[len - 2] = '\0';
3230 if (last_period_in_local_filename == NULL
3231 || !(0 == strcasecmp (last_period_in_local_filename, shortext)
3232 || 0 == strcasecmp (last_period_in_local_filename, ext)))
3234 int local_filename_len = strlen (hs->local_file);
3235 /* Resize the local file, allowing for ".html" preceded by
3236 optional ".NUMBER". */
3237 hs->local_file = xrealloc (hs->local_file,
3238 local_filename_len + 24 + len);
3239 strcpy (hs->local_file + local_filename_len, ext);
3240 /* If clobbering is not allowed and the file, as named,
3241 exists, tack on ".NUMBER.html" instead. */
3242 if (!ALLOW_CLOBBER && file_exists_p (hs->local_file))
3246 sprintf (hs->local_file + local_filename_len,
3247 ".%d%s", ext_num++, ext);
3248 while (file_exists_p (hs->local_file));
3250 *dt |= ADDED_HTML_EXTENSION;
3258 test_parse_content_disposition()
3263 char *opt_dir_prefix;
3267 { "filename=\"file.ext\"", NULL, "file.ext", true },
3268 { "filename=\"file.ext\"", "somedir", "somedir/file.ext", true },
3269 { "attachment; filename=\"file.ext\"", NULL, "file.ext", true },
3270 { "attachment; filename=\"file.ext\"", "somedir", "somedir/file.ext", true },
3271 { "attachment; filename=\"file.ext\"; dummy", NULL, "file.ext", true },
3272 { "attachment; filename=\"file.ext\"; dummy", "somedir", "somedir/file.ext", true },
3273 { "attachment", NULL, NULL, false },
3274 { "attachment", "somedir", NULL, false },
3277 for (i = 0; i < sizeof(test_array)/sizeof(test_array[0]); ++i)
3282 opt.dir_prefix = test_array[i].opt_dir_prefix;
3283 res = parse_content_disposition (test_array[i].hdrval, &filename);
3285 mu_assert ("test_parse_content_disposition: wrong result",
3286 res == test_array[i].result
3288 || 0 == strcmp (test_array[i].filename, filename)));
3294 #endif /* TESTING */
3297 * vim: et sts=2 sw=2 cino+={s