2 Copyright (C) 2003 Free Software Foundation, Inc.
4 This file is part of GNU Wget.
6 GNU Wget is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 GNU Wget is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with Wget; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 In addition, as a special exception, the Free Software Foundation
21 gives permission to link the code of its release of Wget with the
22 OpenSSL project's "OpenSSL" library (or with modified versions of it
23 that use the same license as the "OpenSSL" library), and distribute
24 the linked executables. You must obey the GNU General Public License
25 in all respects for all of the code used other than "OpenSSL". If you
26 modify this file, you may extend this exception to your version of the
27 file, but you are not obligated to do so. If you do not wish to do
28 so, delete this exception statement from your version. */
34 #include <sys/types.h>
45 #if TIME_WITH_SYS_TIME
46 # include <sys/time.h>
50 # include <sys/time.h>
67 # include "gen_sslfunc.h"
75 extern char *version_string;
76 extern LARGE_INT total_downloaded_bytes;
78 extern FILE *output_stream;
79 extern int output_stream_regular;
82 # define MIN(x, y) ((x) > (y) ? (y) : (x))
86 static int cookies_loaded_p;
87 struct cookie_jar *wget_cookie_jar;
89 #define TEXTHTML_S "text/html"
90 #define TEXTXHTML_S "application/xhtml+xml"
92 /* Some status code validation macros: */
93 #define H_20X(x) (((x) >= 200) && ((x) < 300))
94 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
95 #define H_REDIRECTED(x) ((x) == HTTP_STATUS_MOVED_PERMANENTLY \
96 || (x) == HTTP_STATUS_MOVED_TEMPORARILY \
97 || (x) == HTTP_STATUS_SEE_OTHER \
98 || (x) == HTTP_STATUS_TEMPORARY_REDIRECT)
100 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
101 /* Successful 2xx. */
102 #define HTTP_STATUS_OK 200
103 #define HTTP_STATUS_CREATED 201
104 #define HTTP_STATUS_ACCEPTED 202
105 #define HTTP_STATUS_NO_CONTENT 204
106 #define HTTP_STATUS_PARTIAL_CONTENTS 206
108 /* Redirection 3xx. */
109 #define HTTP_STATUS_MULTIPLE_CHOICES 300
110 #define HTTP_STATUS_MOVED_PERMANENTLY 301
111 #define HTTP_STATUS_MOVED_TEMPORARILY 302
112 #define HTTP_STATUS_SEE_OTHER 303 /* from HTTP/1.1 */
113 #define HTTP_STATUS_NOT_MODIFIED 304
114 #define HTTP_STATUS_TEMPORARY_REDIRECT 307 /* from HTTP/1.1 */
116 /* Client error 4xx. */
117 #define HTTP_STATUS_BAD_REQUEST 400
118 #define HTTP_STATUS_UNAUTHORIZED 401
119 #define HTTP_STATUS_FORBIDDEN 403
120 #define HTTP_STATUS_NOT_FOUND 404
121 #define HTTP_STATUS_RANGE_NOT_SATISFIABLE 416
123 /* Server errors 5xx. */
124 #define HTTP_STATUS_INTERNAL 500
125 #define HTTP_STATUS_NOT_IMPLEMENTED 501
126 #define HTTP_STATUS_BAD_GATEWAY 502
127 #define HTTP_STATUS_UNAVAILABLE 503
130 rel_none, rel_name, rel_value, rel_both
137 struct request_header {
139 enum rp release_policy;
141 int hcount, hcapacity;
144 /* Create a new, empty request. At least request_set_method must be
145 called before the request can be used. */
147 static struct request *
150 struct request *req = xnew0 (struct request);
152 req->headers = xnew_array (struct request_header, req->hcapacity);
156 /* Set the request's method and its arguments. METH should be a
157 literal string (or it should outlive the request) because it will
158 not be freed. ARG will be freed by request_free. */
161 request_set_method (struct request *req, const char *meth, char *arg)
167 /* Return the method string passed with the last call to
168 request_set_method. */
171 request_method (const struct request *req)
176 /* Free one header according to the release policy specified with
177 request_set_header. */
180 release_header (struct request_header *hdr)
182 switch (hdr->release_policy)
199 /* Set the request named NAME to VALUE. Specifically, this means that
200 a "NAME: VALUE\r\n" header line will be used in the request. If a
201 header with the same name previously existed in the request, its
202 value will be replaced by this one.
204 RELEASE_POLICY determines whether NAME and VALUE should be released
205 (freed) with request_free. Allowed values are:
207 - rel_none - don't free NAME or VALUE
208 - rel_name - free NAME when done
209 - rel_value - free VALUE when done
210 - rel_both - free both NAME and VALUE when done
212 Setting release policy is useful when arguments come from different
213 sources. For example:
215 // Don't free literal strings!
216 request_set_header (req, "Pragma", "no-cache", rel_none);
218 // Don't free a global variable, we'll need it later.
219 request_set_header (req, "Referer", opt.referer, rel_none);
221 // Value freshly allocated, free it when done.
222 request_set_header (req, "Range", aprintf ("bytes=%ld-", hs->restval),
227 request_set_header (struct request *req, char *name, char *value,
228 enum rp release_policy)
230 struct request_header *hdr;
234 for (i = 0; i < req->hcount; i++)
236 hdr = &req->headers[i];
237 if (0 == strcasecmp (name, hdr->name))
239 /* Replace existing header. */
240 release_header (hdr);
243 hdr->release_policy = release_policy;
248 /* Install new header. */
250 if (req->hcount >= req->hcount)
252 req->hcapacity <<= 1;
253 req->headers = xrealloc (req->headers,
254 req->hcapacity * sizeof (struct request_header));
256 hdr = &req->headers[req->hcount++];
259 hdr->release_policy = release_policy;
262 /* Like request_set_header, but sets the whole header line, as
263 provided by the user using the `--header' option. For example,
264 request_set_user_header (req, "Foo: bar") works just like
265 request_set_header (req, "Foo", "bar"). */
268 request_set_user_header (struct request *req, const char *header)
271 const char *p = strchr (header, ':');
274 BOUNDED_TO_ALLOCA (header, p, name);
278 request_set_header (req, xstrdup (name), (char *) p, rel_name);
281 #define APPEND(p, str) do { \
282 int A_len = strlen (str); \
283 memcpy (p, str, A_len); \
287 /* Construct the request and write it to FD using fd_write. */
290 request_send (const struct request *req, int fd)
292 char *request_string, *p;
293 int i, size, write_error;
295 /* Count the request size. */
298 /* METHOD " " ARG " " "HTTP/1.0" "\r\n" */
299 size += strlen (req->method) + 1 + strlen (req->arg) + 1 + 8 + 2;
301 for (i = 0; i < req->hcount; i++)
303 struct request_header *hdr = &req->headers[i];
304 /* NAME ": " VALUE "\r\n" */
305 size += strlen (hdr->name) + 2 + strlen (hdr->value) + 2;
311 p = request_string = alloca_array (char, size);
313 /* Generate the request. */
315 APPEND (p, req->method); *p++ = ' ';
316 APPEND (p, req->arg); *p++ = ' ';
317 memcpy (p, "HTTP/1.0\r\n", 10); p += 10;
319 for (i = 0; i < req->hcount; i++)
321 struct request_header *hdr = &req->headers[i];
322 APPEND (p, hdr->name);
323 *p++ = ':', *p++ = ' ';
324 APPEND (p, hdr->value);
325 *p++ = '\r', *p++ = '\n';
328 *p++ = '\r', *p++ = '\n', *p++ = '\0';
329 assert (p - request_string == size);
333 DEBUGP (("\n---request begin---\n%s---request end---\n", request_string));
335 /* Send the request to the server. */
337 write_error = fd_write (fd, request_string, size - 1, -1);
339 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
344 /* Release the resources used by REQ. */
347 request_free (struct request *req)
350 xfree_null (req->arg);
351 for (i = 0; i < req->hcount; i++)
352 release_header (&req->headers[i]);
353 xfree_null (req->headers);
357 /* Send the contents of FILE_NAME to SOCK/SSL. Make sure that exactly
358 PROMISED_SIZE bytes are sent over the wire -- if the file is
359 longer, read only that much; if the file is shorter, report an error. */
362 post_file (int sock, const char *file_name, long promised_size)
364 static char chunk[8192];
369 DEBUGP (("[writing POST file %s ... ", file_name));
371 fp = fopen (file_name, "rb");
374 while (!feof (fp) && written < promised_size)
377 int length = fread (chunk, 1, sizeof (chunk), fp);
380 towrite = MIN (promised_size - written, length);
381 write_error = fd_write (sock, chunk, towrite, -1);
391 /* If we've written less than was promised, report a (probably
392 nonsensical) error rather than break the promise. */
393 if (written < promised_size)
399 assert (written == promised_size);
400 DEBUGP (("done]\n"));
405 head_terminator (const char *hunk, int oldlen, int peeklen)
407 const char *start, *end;
409 /* If at first peek, verify whether HUNK starts with "HTTP". If
410 not, this is a HTTP/0.9 request and we must bail out without
412 if (oldlen == 0 && 0 != memcmp (hunk, "HTTP", MIN (peeklen, 4)))
418 start = hunk + oldlen - 4;
419 end = hunk + oldlen + peeklen;
421 for (; start < end - 1; start++)
428 if (start[1] == '\n')
434 /* Read the HTTP request head from FD and return it. The error
435 conditions are the same as with fd_read_hunk.
437 To support HTTP/0.9 responses, this function tries to make sure
438 that the data begins with "HTTP". If this is not the case, no data
439 is read and an empty request is returned, so that the remaining
440 data can be treated as body. */
443 fd_read_http_head (int fd)
445 return fd_read_hunk (fd, head_terminator, 512);
449 /* The response data. */
452 /* The array of pointers that indicate where each header starts.
453 For example, given this HTTP response:
460 The headers are located like this:
462 "HTTP/1.0 200 Ok\r\nDescription: some\r\n text\r\nEtag: x\r\n\r\n"
464 headers[0] headers[1] headers[2] headers[3]
466 I.e. headers[0] points to the beginning of the request,
467 headers[1] points to the end of the first header and the
468 beginning of the second one, etc. */
470 const char **headers;
473 /* Create a new response object from the text of the HTTP response,
474 available in HEAD. That text is automatically split into
475 constituent header lines for fast retrieval using
476 response_header_*. */
478 static struct response *
479 response_new (const char *head)
484 struct response *resp = xnew0 (struct response);
489 /* Empty head means that we're dealing with a headerless
490 (HTTP/0.9) response. In that case, don't set HEADERS at
495 /* Split HEAD into header lines, so that response_header_* functions
496 don't need to do this over and over again. */
502 DO_REALLOC (resp->headers, size, count + 1, const char *);
503 resp->headers[count++] = hdr;
505 /* Break upon encountering an empty line. */
506 if (!hdr[0] || (hdr[0] == '\r' && hdr[1] == '\n') || hdr[0] == '\n')
509 /* Find the end of HDR, including continuations. */
512 const char *end = strchr (hdr, '\n');
518 while (*hdr == ' ' || *hdr == '\t');
520 DO_REALLOC (resp->headers, size, count + 1, const char *);
521 resp->headers[count++] = NULL;
526 /* Locate the header named NAME in the request data. If found, set
527 *BEGPTR to its starting, and *ENDPTR to its ending position, and
528 return 1. Otherwise return 0.
530 This function is used as a building block for response_header_copy
531 and response_header_strdup. */
534 response_header_bounds (const struct response *resp, const char *name,
535 const char **begptr, const char **endptr)
538 const char **headers = resp->headers;
541 if (!headers || !headers[1])
544 name_len = strlen (name);
546 for (i = 1; headers[i + 1]; i++)
548 const char *b = headers[i];
549 const char *e = headers[i + 1];
551 && b[name_len] == ':'
552 && 0 == strncasecmp (b, name, name_len))
555 while (b < e && ISSPACE (*b))
557 while (b < e && ISSPACE (e[-1]))
567 /* Copy the response header named NAME to buffer BUF, no longer than
568 BUFSIZE (BUFSIZE includes the terminating 0). If the header
569 exists, 1 is returned, otherwise 0. If there should be no limit on
570 the size of the header, use response_header_strdup instead.
572 If BUFSIZE is 0, no data is copied, but the boolean indication of
573 whether the header is present is still returned. */
576 response_header_copy (const struct response *resp, const char *name,
577 char *buf, int bufsize)
580 if (!response_header_bounds (resp, name, &b, &e))
584 int len = MIN (e - b, bufsize);
585 strncpy (buf, b, len);
591 /* Return the value of header named NAME in RESP, allocated with
592 malloc. If such a header does not exist in RESP, return NULL. */
595 response_header_strdup (const struct response *resp, const char *name)
598 if (!response_header_bounds (resp, name, &b, &e))
600 return strdupdelim (b, e);
603 /* Parse the HTTP status line, which is of format:
605 HTTP-Version SP Status-Code SP Reason-Phrase
607 The function returns the status-code, or -1 if the status line
608 appears malformed. The pointer to "reason-phrase" message is
609 returned in *MESSAGE. */
612 response_status (const struct response *resp, char **message)
619 /* For a HTTP/0.9 response, assume status 200. */
621 *message = xstrdup (_("No headers, assuming HTTP/0.9"));
625 p = resp->headers[0];
626 end = resp->headers[1];
632 if (end - p < 4 || 0 != strncmp (p, "HTTP", 4))
636 /* Match the HTTP version. This is optional because Gnutella
637 servers have been reported to not specify HTTP version. */
638 if (p < end && *p == '/')
641 while (p < end && ISDIGIT (*p))
643 if (p < end && *p == '.')
645 while (p < end && ISDIGIT (*p))
649 while (p < end && ISSPACE (*p))
651 if (end - p < 3 || !ISDIGIT (p[0]) || !ISDIGIT (p[1]) || !ISDIGIT (p[2]))
654 status = 100 * (p[0] - '0') + 10 * (p[1] - '0') + (p[2] - '0');
659 while (p < end && ISSPACE (*p))
661 while (p < end && ISSPACE (end[-1]))
663 *message = strdupdelim (p, end);
669 /* Release the resources used by RESP. */
672 response_free (struct response *resp)
674 xfree_null (resp->headers);
678 /* Print [b, e) to the log, omitting the trailing CRLF. */
681 print_server_response_1 (const char *prefix, const char *b, const char *e)
684 if (b < e && e[-1] == '\n')
686 if (b < e && e[-1] == '\r')
688 BOUNDED_TO_ALLOCA (b, e, ln);
689 logprintf (LOG_VERBOSE, "%s%s\n", prefix, ln);
692 /* Print the server response, line by line, omitting the trailing CR
693 characters, prefixed with PREFIX. */
696 print_server_response (const struct response *resp, const char *prefix)
701 for (i = 0; resp->headers[i + 1]; i++)
702 print_server_response_1 (prefix, resp->headers[i], resp->headers[i + 1]);
705 /* Parse the `Content-Range' header and extract the information it
706 contains. Returns 1 if successful, -1 otherwise. */
708 parse_content_range (const char *hdr, long *first_byte_ptr,
709 long *last_byte_ptr, long *entity_length_ptr)
713 /* Ancient versions of Netscape proxy server, presumably predating
714 rfc2068, sent out `Content-Range' without the "bytes"
716 if (!strncasecmp (hdr, "bytes", 5))
719 /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the
723 while (ISSPACE (*hdr))
730 for (num = 0; ISDIGIT (*hdr); hdr++)
731 num = 10 * num + (*hdr - '0');
732 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
734 *first_byte_ptr = num;
736 for (num = 0; ISDIGIT (*hdr); hdr++)
737 num = 10 * num + (*hdr - '0');
738 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
740 *last_byte_ptr = num;
742 for (num = 0; ISDIGIT (*hdr); hdr++)
743 num = 10 * num + (*hdr - '0');
744 *entity_length_ptr = num;
748 /* Read the body of the request, but don't store it anywhere and don't
749 display a progress gauge. This is useful for reading the error
750 responses whose bodies don't need to be displayed or logged, but
751 which need to be read anyway. */
754 skip_short_body (int fd, long contlen)
756 /* Skipping the body doesn't make sense if the content length is
757 unknown because, in that case, persistent connections cannot be
758 used. (#### This is not the case with HTTP/1.1 where they can
759 still be used with the magic of the "chunked" transfer!) */
762 DEBUGP (("Skipping %ld bytes of body data... ", contlen));
767 int ret = fd_read (fd, dlbuf, MIN (contlen, sizeof (dlbuf)), -1);
772 DEBUGP (("done.\n"));
775 /* Persistent connections. Currently, we cache the most recently used
776 connection as persistent, provided that the HTTP server agrees to
777 make it such. The persistence data is stored in the variables
778 below. Ideally, it should be possible to cache an arbitrary fixed
779 number of these connections. */
781 /* Whether a persistent connection is active. */
782 static int pconn_active;
785 /* The socket of the connection. */
788 /* Host and port of the currently active persistent connection. */
792 /* Whether a ssl handshake has occoured on this connection. */
796 /* Mark the persistent connection as invalid and free the resources it
797 uses. This is used by the CLOSE_* macros after they forcefully
798 close a registered persistent connection. */
801 invalidate_persistent (void)
803 DEBUGP (("Disabling further reuse of socket %d.\n", pconn.socket));
805 fd_close (pconn.socket);
810 /* Register FD, which should be a TCP/IP connection to HOST:PORT, as
811 persistent. This will enable someone to use the same connection
812 later. In the context of HTTP, this must be called only AFTER the
813 response has been received and the server has promised that the
814 connection will remain alive.
816 If a previous connection was persistent, it is closed. */
819 register_persistent (const char *host, int port, int fd, int ssl)
823 if (pconn.socket == fd)
825 /* The connection FD is already registered. */
830 /* The old persistent connection is still active; close it
831 first. This situation arises whenever a persistent
832 connection exists, but we then connect to a different
833 host, and try to register a persistent connection to that
835 invalidate_persistent ();
841 pconn.host = xstrdup (host);
845 DEBUGP (("Registered socket %d for persistent reuse.\n", fd));
848 /* Return non-zero if a persistent connection is available for
849 connecting to HOST:PORT. */
852 persistent_available_p (const char *host, int port, int ssl,
853 int *host_lookup_failed)
855 /* First, check whether a persistent connection is active at all. */
859 /* If we want SSL and the last connection wasn't or vice versa,
860 don't use it. Checking for host and port is not enough because
861 HTTP and HTTPS can apparently coexist on the same port. */
862 if (ssl != pconn.ssl)
865 /* If we're not connecting to the same port, we're not interested. */
866 if (port != pconn.port)
869 /* If the host is the same, we're in business. If not, there is
870 still hope -- read below. */
871 if (0 != strcasecmp (host, pconn.host))
873 /* If pconn.socket is already talking to HOST, we needn't
874 reconnect. This happens often when both sites are virtual
875 hosts distinguished only by name and served by the same
876 network interface, and hence the same web server (possibly
877 set up by the ISP and serving many different web sites).
878 This admittedly non-standard optimization does not contradict
879 HTTP and works well with popular server software. */
883 struct address_list *al;
886 /* Don't try to talk to two different SSL sites over the same
887 secure connection! (Besides, it's not clear if name-based
888 virtual hosting is even possible with SSL.) */
891 /* If pconn.socket's peer is one of the IP addresses HOST
892 resolves to, pconn.socket is for all intents and purposes
893 already talking to HOST. */
895 if (!socket_ip_address (pconn.socket, &ip, ENDPOINT_PEER))
897 /* Can't get the peer's address -- something must be very
898 wrong with the connection. */
899 invalidate_persistent ();
902 al = lookup_host (host, 0);
905 *host_lookup_failed = 1;
909 found = address_list_contains (al, &ip);
910 address_list_release (al);
915 /* The persistent connection's peer address was found among the
916 addresses HOST resolved to; therefore, pconn.sock is in fact
917 already talking to HOST -- no need to reconnect. */
920 /* Finally, check whether the connection is still open. This is
921 important because most server implement a liberal (short) timeout
922 on persistent connections. Wget can of course always reconnect
923 if the connection doesn't work out, but it's nicer to know in
924 advance. This test is a logical followup of the first test, but
925 is "expensive" and therefore placed at the end of the list. */
927 if (!test_socket_open (pconn.socket))
929 /* Oops, the socket is no longer open. Now that we know that,
930 let's invalidate the persistent connection before returning
932 invalidate_persistent ();
939 /* The idea behind these two CLOSE macros is to distinguish between
940 two cases: one when the job we've been doing is finished, and we
941 want to close the connection and leave, and two when something is
942 seriously wrong and we're closing the connection as part of
945 In case of keep_alive, CLOSE_FINISH should leave the connection
946 open, while CLOSE_INVALIDATE should still close it.
948 Note that the semantics of the flag `keep_alive' is "this
949 connection *will* be reused (the server has promised not to close
950 the connection once we're done)", while the semantics of
951 `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an
952 active, registered connection". */
954 #define CLOSE_FINISH(fd) do { \
957 if (pconn_active && (fd) == pconn.socket) \
958 invalidate_persistent (); \
967 #define CLOSE_INVALIDATE(fd) do { \
968 if (pconn_active && (fd) == pconn.socket) \
969 invalidate_persistent (); \
977 long len; /* received length */
978 long contlen; /* expected length */
979 long restval; /* the restart value */
980 int res; /* the result of last read */
981 char *newloc; /* new location (redirection) */
982 char *remote_time; /* remote time-stamp string */
983 char *error; /* textual HTTP error */
984 int statcode; /* status code */
985 long rd_size; /* amount of data read from socket */
986 double dltime; /* time it took to download the data */
987 const char *referer; /* value of the referer header. */
988 char **local_file; /* local file. */
992 free_hstat (struct http_stat *hs)
994 xfree_null (hs->newloc);
995 xfree_null (hs->remote_time);
996 xfree_null (hs->error);
998 /* Guard against being called twice. */
1000 hs->remote_time = NULL;
1004 static char *create_authorization_line PARAMS ((const char *, const char *,
1005 const char *, const char *,
1007 static char *basic_authentication_encode PARAMS ((const char *, const char *));
1008 static int known_authentication_scheme_p PARAMS ((const char *));
1010 time_t http_atotm PARAMS ((const char *));
1012 #define BEGINS_WITH(line, string_constant) \
1013 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1014 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1015 || !line[sizeof (string_constant) - 1]))
1017 /* Retrieve a document through HTTP protocol. It recognizes status
1018 code, and correctly handles redirections. It closes the network
1019 socket. If it receives an error from the functions below it, it
1020 will print it if there is enough information to do so (almost
1021 always), returning the error to the caller (i.e. http_loop).
1023 Various HTTP parameters are stored to hs.
1025 If PROXY is non-NULL, the connection will be made to the proxy
1026 server, and u->url will be requested. */
1028 gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy)
1030 struct request *req;
1033 char *user, *passwd;
1037 long contlen, contrange;
1044 /* Whether authorization has been already tried. */
1045 int auth_tried_already = 0;
1047 /* Whether our connection to the remote host is through SSL. */
1051 struct response *resp;
1055 /* Whether this connection will be kept alive after the HTTP request
1059 /* Whether keep-alive should be inhibited. */
1060 int inhibit_keep_alive = !opt.http_keep_alive;
1062 /* Headers sent when using POST. */
1063 long post_data_size = 0;
1065 int host_lookup_failed = 0;
1068 if (u->scheme == SCHEME_HTTPS)
1070 /* Initialize the SSL context. After this has once been done,
1071 it becomes a no-op. */
1072 switch (ssl_init ())
1074 case SSLERRCTXCREATE:
1076 logprintf (LOG_NOTQUIET, _("Failed to set up an SSL context\n"));
1077 return SSLERRCTXCREATE;
1078 case SSLERRCERTFILE:
1079 /* try without certfile */
1080 logprintf (LOG_NOTQUIET,
1081 _("Failed to load certificates from %s\n"),
1083 logprintf (LOG_NOTQUIET,
1084 _("Trying without the specified certificate\n"));
1087 logprintf (LOG_NOTQUIET,
1088 _("Failed to get certificate key from %s\n"),
1090 logprintf (LOG_NOTQUIET,
1091 _("Trying without the specified certificate\n"));
1097 #endif /* HAVE_SSL */
1099 if (!(*dt & HEAD_ONLY))
1100 /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to
1101 know the local filename so we can save to it. */
1102 assert (*hs->local_file != NULL);
1104 auth_tried_already = 0;
1106 /* Initialize certain elements of struct http_stat. */
1111 hs->remote_time = NULL;
1119 char *proxy_user, *proxy_passwd;
1120 /* For normal username and password, URL components override
1121 command-line/wgetrc parameters. With proxy
1122 authentication, it's the reverse, because proxy URLs are
1123 normally the "permanent" ones, so command-line args
1124 should take precedence. */
1125 if (opt.proxy_user && opt.proxy_passwd)
1127 proxy_user = opt.proxy_user;
1128 proxy_passwd = opt.proxy_passwd;
1132 proxy_user = proxy->user;
1133 proxy_passwd = proxy->passwd;
1135 /* #### This does not appear right. Can't the proxy request,
1136 say, `Digest' authentication? */
1137 if (proxy_user && proxy_passwd)
1138 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd);
1140 /* If we're using a proxy, we will be connecting to the proxy
1145 /* Prepare the request to send. */
1147 req = request_new ();
1149 const char *meth = "GET";
1150 if (*dt & HEAD_ONLY)
1152 else if (opt.post_file_name || opt.post_data)
1154 /* Use the full path, i.e. one that includes the leading slash and
1155 the query string. E.g. if u->path is "foo/bar" and u->query is
1156 "param=value", full_path will be "/foo/bar?param=value". */
1157 request_set_method (req, meth,
1158 proxy ? xstrdup (u->url) : url_full_path (u));
1161 request_set_header (req, "Referer", (char *) hs->referer, rel_none);
1162 if (*dt & SEND_NOCACHE)
1163 request_set_header (req, "Pragma", "no-cache", rel_none);
1165 request_set_header (req, "Range",
1166 aprintf ("bytes=%ld-", hs->restval), rel_value);
1168 request_set_header (req, "User-Agent", opt.useragent, rel_none);
1170 request_set_header (req, "User-Agent",
1171 aprintf ("Wget/%s", version_string), rel_value);
1172 request_set_header (req, "Accept", "*/*", rel_none);
1174 /* Find the username and password for authentication. */
1177 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
1178 user = user ? user : opt.http_user;
1179 passwd = passwd ? passwd : opt.http_passwd;
1183 /* We have the username and the password, but haven't tried
1184 any authorization yet. Let's see if the "Basic" method
1185 works. If not, we'll come back here and construct a
1186 proper authorization method with the right challenges.
1188 If we didn't employ this kind of logic, every URL that
1189 requires authorization would have to be processed twice,
1190 which is very suboptimal and generates a bunch of false
1191 "unauthorized" errors in the server log.
1193 #### But this logic also has a serious problem when used
1194 with stronger authentications: we *first* transmit the
1195 username and the password in clear text, and *then* attempt a
1196 stronger authentication scheme. That cannot be right! We
1197 are only fortunate that almost everyone still uses the
1198 `Basic' scheme anyway.
1200 There should be an option to prevent this from happening, for
1201 those who use strong authentication schemes and value their
1203 request_set_header (req, "Authorization",
1204 basic_authentication_encode (user, passwd),
1209 /* Whether we need to print the host header with braces around
1210 host, e.g. "Host: [3ffe:8100:200:2::2]:1234" instead of the
1211 usual "Host: symbolic-name:1234". */
1212 int squares = strchr (u->host, ':') != NULL;
1213 if (u->port == scheme_default_port (u->scheme))
1214 request_set_header (req, "Host",
1215 aprintf (squares ? "[%s]" : "%s", u->host),
1218 request_set_header (req, "Host",
1219 aprintf (squares ? "[%s]:%d" : "%s:%d",
1224 if (!inhibit_keep_alive)
1225 request_set_header (req, "Connection", "Keep-Alive", rel_none);
1228 request_set_header (req, "Cookie",
1229 cookie_header (wget_cookie_jar,
1230 u->host, u->port, u->path,
1232 u->scheme == SCHEME_HTTPS
1239 if (opt.post_data || opt.post_file_name)
1241 request_set_header (req, "Content-Type",
1242 "application/x-www-form-urlencoded", rel_none);
1244 post_data_size = strlen (opt.post_data);
1247 post_data_size = file_size (opt.post_file_name);
1248 if (post_data_size == -1)
1250 logprintf (LOG_NOTQUIET, "POST data file missing: %s\n",
1251 opt.post_file_name);
1255 request_set_header (req, "Content-Length",
1256 aprintf ("Content-Length: %ld", post_data_size),
1260 /* Add the user headers. */
1261 if (opt.user_headers)
1264 for (i = 0; opt.user_headers[i]; i++)
1265 request_set_user_header (req, opt.user_headers[i]);
1269 /* We need to come back here when the initial attempt to retrieve
1270 without authorization header fails. (Expected to happen at least
1271 for the Digest authorization scheme.) */
1275 /* Establish the connection. */
1277 if (!inhibit_keep_alive)
1279 /* Look for a persistent connection to target host, unless a
1280 proxy is used. The exception is when SSL is in use, in which
1281 case the proxy is nothing but a passthrough to the target
1282 host, registered as a connection to the latter. */
1283 struct url *relevant = conn;
1285 if (u->scheme == SCHEME_HTTPS)
1289 if (persistent_available_p (relevant->host, relevant->port,
1291 relevant->scheme == SCHEME_HTTPS,
1295 &host_lookup_failed))
1297 sock = pconn.socket;
1298 using_ssl = pconn.ssl;
1299 logprintf (LOG_VERBOSE, _("Reusing existing connection to %s:%d.\n"),
1300 pconn.host, pconn.port);
1301 DEBUGP (("Reusing fd %d.\n", sock));
1307 /* In its current implementation, persistent_available_p will
1308 look up conn->host in some cases. If that lookup failed, we
1309 don't need to bother with connect_to_host. */
1310 if (host_lookup_failed)
1313 sock = connect_to_host (conn->host, conn->port);
1317 return (retryable_socket_connect_error (errno)
1318 ? CONERROR : CONIMPOSSIBLE);
1321 if (proxy && u->scheme == SCHEME_HTTPS)
1323 /* When requesting SSL URLs through proxies, use the
1324 CONNECT method to request passthrough. */
1325 struct request *connreq = request_new ();
1326 request_set_method (connreq, "CONNECT",
1327 aprintf ("%s:%d", u->host, u->port));
1330 request_set_header (connreq, "Proxy-Authorization",
1331 proxyauth, rel_value);
1332 /* Now that PROXYAUTH is part of the CONNECT request,
1333 zero it out so we don't send proxy authorization with
1334 the regular request below. */
1338 write_error = request_send (connreq, sock);
1339 request_free (connreq);
1340 if (write_error < 0)
1342 logprintf (LOG_VERBOSE, _("Failed writing to proxy: %s.\n"),
1344 CLOSE_INVALIDATE (sock);
1348 head = fd_read_http_head (sock);
1351 logprintf (LOG_VERBOSE, _("Failed reading proxy response: %s\n"),
1353 CLOSE_INVALIDATE (sock);
1362 DEBUGP (("proxy responded with: [%s]\n", head));
1364 resp = response_new (head);
1365 statcode = response_status (resp, &message);
1366 response_free (resp);
1367 if (statcode != 200)
1370 logprintf (LOG_NOTQUIET, _("Proxy tunneling failed: %s"),
1371 message ? message : "?");
1372 xfree_null (message);
1377 /* SOCK is now *really* connected to u->host, so update CONN
1378 to reflect this. That way register_persistent will
1379 register SOCK as being connected to u->host:u->port. */
1383 if (conn->scheme == SCHEME_HTTPS)
1385 if (!ssl_connect (sock))
1392 #endif /* HAVE_SSL */
1395 /* Send the request to server. */
1396 write_error = request_send (req, sock);
1398 if (write_error >= 0)
1402 DEBUGP (("[POST data: %s]\n", opt.post_data));
1403 write_error = fd_write (sock, opt.post_data, post_data_size, -1);
1405 else if (opt.post_file_name && post_data_size != 0)
1406 write_error = post_file (sock, opt.post_file_name, post_data_size);
1409 if (write_error < 0)
1411 logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"),
1413 CLOSE_INVALIDATE (sock);
1417 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
1418 proxy ? "Proxy" : "HTTP");
1425 head = fd_read_http_head (sock);
1430 logputs (LOG_NOTQUIET, _("No data received.\n"));
1431 CLOSE_INVALIDATE (sock);
1437 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
1439 CLOSE_INVALIDATE (sock);
1444 DEBUGP (("\n---response begin---\n%s---response end---\n", head));
1446 resp = response_new (head);
1448 /* Check for status line. */
1450 statcode = response_status (resp, &message);
1451 if (!opt.server_response)
1452 logprintf (LOG_VERBOSE, "%2d %s\n", statcode, message ? message : "");
1455 logprintf (LOG_VERBOSE, "\n");
1456 print_server_response (resp, " ");
1459 if (response_header_copy (resp, "Content-Length", hdrval, sizeof (hdrval)))
1460 contlen = strtol (hdrval, NULL, 10);
1462 /* Check for keep-alive related responses. */
1463 if (!inhibit_keep_alive && contlen != -1)
1465 if (response_header_copy (resp, "Keep-Alive", NULL, 0))
1467 else if (response_header_copy (resp, "Connection", hdrval,
1470 if (0 == strcasecmp (hdrval, "Keep-Alive"))
1475 /* The server has promised that it will not close the connection
1476 when we're done. This means that we can register it. */
1477 register_persistent (conn->host, conn->port, sock, using_ssl);
1479 if (statcode == HTTP_STATUS_UNAUTHORIZED)
1481 /* Authorization is required. */
1482 skip_short_body (sock, contlen);
1483 CLOSE_FINISH (sock);
1484 if (auth_tried_already || !(user && passwd))
1486 /* If we have tried it already, then there is not point
1488 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
1492 char *www_authenticate = response_header_strdup (resp,
1493 "WWW-Authenticate");
1494 /* If the authentication scheme is unknown or if it's the
1495 "Basic" authentication (which we try by default), there's
1496 no sense in retrying. */
1497 if (!www_authenticate
1498 || !known_authentication_scheme_p (www_authenticate)
1499 || BEGINS_WITH (www_authenticate, "Basic"))
1501 xfree_null (www_authenticate);
1502 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
1507 auth_tried_already = 1;
1508 pth = url_full_path (u);
1509 request_set_header (req, "Authorization",
1510 create_authorization_line (www_authenticate,
1512 request_method (req),
1516 xfree (www_authenticate);
1517 goto retry_with_auth;
1525 hs->statcode = statcode;
1527 hs->error = xstrdup (_("Malformed status line"));
1529 hs->error = xstrdup (_("(no description)"));
1531 hs->error = xstrdup (message);
1533 type = response_header_strdup (resp, "Content-Type");
1536 char *tmp = strchr (type, ';');
1539 while (tmp > type && ISSPACE (tmp[-1]))
1544 hs->newloc = response_header_strdup (resp, "Location");
1545 hs->remote_time = response_header_strdup (resp, "Last-Modified");
1547 char *set_cookie = response_header_strdup (resp, "Set-Cookie");
1550 /* The jar should have been created by now. */
1551 assert (wget_cookie_jar != NULL);
1552 cookie_handle_set_cookie (wget_cookie_jar, u->host, u->port, u->path,
1557 if (response_header_copy (resp, "Content-Range", hdrval, sizeof (hdrval)))
1559 long first_byte_pos, last_byte_pos, entity_length;
1560 if (parse_content_range (hdrval, &first_byte_pos, &last_byte_pos,
1562 contrange = first_byte_pos;
1564 response_free (resp);
1566 /* 20x responses are counted among successful by default. */
1567 if (H_20X (statcode))
1570 /* Return if redirected. */
1571 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
1573 /* RFC2068 says that in case of the 300 (multiple choices)
1574 response, the server can output a preferred URL through
1575 `Location' header; otherwise, the request should be treated
1576 like GET. So, if the location is set, it will be a
1577 redirection; otherwise, just proceed normally. */
1578 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
1582 logprintf (LOG_VERBOSE,
1583 _("Location: %s%s\n"),
1584 hs->newloc ? hs->newloc : _("unspecified"),
1585 hs->newloc ? _(" [following]") : "");
1587 skip_short_body (sock, contlen);
1588 CLOSE_FINISH (sock);
1594 /* If content-type is not given, assume text/html. This is because
1595 of the multitude of broken CGI's that "forget" to generate the
1598 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) ||
1599 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S)))
1604 if (opt.html_extension && (*dt & TEXTHTML))
1605 /* -E / --html-extension / html_extension = on was specified, and this is a
1606 text/html file. If some case-insensitive variation on ".htm[l]" isn't
1607 already the file's suffix, tack on ".html". */
1609 char* last_period_in_local_filename = strrchr(*hs->local_file, '.');
1611 if (last_period_in_local_filename == NULL
1612 || !(0 == strcasecmp (last_period_in_local_filename, ".htm")
1613 || 0 == strcasecmp (last_period_in_local_filename, ".html")))
1615 size_t local_filename_len = strlen(*hs->local_file);
1617 *hs->local_file = xrealloc(*hs->local_file,
1618 local_filename_len + sizeof(".html"));
1619 strcpy(*hs->local_file + local_filename_len, ".html");
1621 *dt |= ADDED_HTML_EXTENSION;
1625 if (statcode == HTTP_STATUS_RANGE_NOT_SATISFIABLE)
1627 /* If `-c' is in use and the file has been fully downloaded (or
1628 the remote file has shrunk), Wget effectively requests bytes
1629 after the end of file and the server response with 416. */
1630 logputs (LOG_VERBOSE, _("\
1631 \n The file is already fully retrieved; nothing to do.\n\n"));
1632 /* In case the caller inspects. */
1635 /* Mark as successfully retrieved. */
1638 CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there
1639 might be more bytes in the body. */
1640 return RETRUNNEEDED;
1642 if ((contrange != 0 && contrange != hs->restval)
1643 || (H_PARTIAL (statcode) && !contrange))
1645 /* The Range request was somehow misunderstood by the server.
1648 CLOSE_INVALIDATE (sock);
1651 hs->contlen = contlen + contrange;
1657 /* No need to print this output if the body won't be
1658 downloaded at all, or if the original server response is
1660 logputs (LOG_VERBOSE, _("Length: "));
1663 logputs (LOG_VERBOSE, legible (contlen + contrange));
1665 logprintf (LOG_VERBOSE, _(" (%s to go)"), legible (contlen));
1668 logputs (LOG_VERBOSE,
1669 opt.ignore_length ? _("ignored") : _("unspecified"));
1671 logprintf (LOG_VERBOSE, " [%s]\n", type);
1673 logputs (LOG_VERBOSE, "\n");
1677 type = NULL; /* We don't need it any more. */
1679 /* Return if we have no intention of further downloading. */
1680 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
1682 /* In case the caller cares to look... */
1686 /* Pre-1.10 Wget used CLOSE_INVALIDATE here. Now we trust the
1687 servers not to send body in response to a HEAD request. If
1688 you encounter such a server (more likely a broken CGI), use
1689 `--no-http-keep-alive'. */
1690 CLOSE_FINISH (sock);
1691 return RETRFINISHED;
1694 /* Open the local file. */
1697 mkalldirs (*hs->local_file);
1699 rotate_backups (*hs->local_file);
1700 fp = fopen (*hs->local_file, hs->restval ? "ab" : "wb");
1703 logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno));
1704 CLOSE_INVALIDATE (sock);
1711 /* #### This confuses the timestamping code that checks for file
1712 size. Maybe we should save some additional information? */
1713 if (opt.save_headers)
1714 fwrite (head, 1, strlen (head), fp);
1716 /* Download the request body. */
1719 flags |= rb_read_exactly;
1720 if (hs->restval > 0 && contrange == 0)
1721 flags |= rb_skip_startpos;
1722 hs->len = hs->restval;
1724 hs->res = fd_read_body (sock, fp, contlen != -1 ? contlen : 0,
1725 hs->restval, &hs->rd_size, &hs->len, &hs->dltime,
1729 CLOSE_FINISH (sock);
1731 CLOSE_INVALIDATE (sock);
1734 /* Close or flush the file. We have to be careful to check for
1735 error here. Checking the result of fwrite() is not enough --
1736 errors could go unnoticed! */
1739 flush_res = fclose (fp);
1741 flush_res = fflush (fp);
1742 if (flush_res == EOF)
1747 return RETRFINISHED;
1750 /* The genuine HTTP loop! This is the part where the retrieval is
1751 retried, and retried, and retried, and... */
1753 http_loop (struct url *u, char **newloc, char **local_file, const char *referer,
1754 int *dt, struct url *proxy)
1757 int use_ts, got_head = 0; /* time-stamping info */
1758 char *filename_plus_orig_suffix;
1759 char *local_filename = NULL;
1760 char *tms, *locf, *tmrate;
1762 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
1763 long local_size = 0; /* the size of the local file */
1764 size_t filename_len;
1765 struct http_stat hstat; /* HTTP status */
1769 /* This used to be done in main(), but it's a better idea to do it
1770 here so that we don't go through the hoops if we're just using
1774 if (!wget_cookie_jar)
1775 wget_cookie_jar = cookie_jar_new ();
1776 if (opt.cookies_input && !cookies_loaded_p)
1778 cookie_jar_load (wget_cookie_jar, opt.cookies_input);
1779 cookies_loaded_p = 1;
1785 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
1786 has_wildcards_p because it would also warn on `?', and we know that
1787 shows up in CGI paths a *lot*. */
1788 if (strchr (u->url, '*'))
1789 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
1793 /* Determine the local filename. */
1794 if (local_file && *local_file)
1795 hstat.local_file = local_file;
1796 else if (local_file)
1798 *local_file = url_file_name (u);
1799 hstat.local_file = local_file;
1803 dummy = url_file_name (u);
1804 hstat.local_file = &dummy;
1807 if (!opt.output_document)
1808 locf = *hstat.local_file;
1810 locf = opt.output_document;
1812 hstat.referer = referer;
1814 filename_len = strlen (*hstat.local_file);
1815 filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig"));
1817 if (opt.noclobber && file_exists_p (*hstat.local_file))
1819 /* If opt.noclobber is turned on and file already exists, do not
1820 retrieve the file */
1821 logprintf (LOG_VERBOSE, _("\
1822 File `%s' already there, will not retrieve.\n"), *hstat.local_file);
1823 /* If the file is there, we suppose it's retrieved OK. */
1826 /* #### Bogusness alert. */
1827 /* If its suffix is "html" or "htm" or similar, assume text/html. */
1828 if (has_html_suffix_p (*hstat.local_file))
1836 if (opt.timestamping)
1838 int local_dot_orig_file_exists = 0;
1840 if (opt.backup_converted)
1841 /* If -K is specified, we'll act on the assumption that it was specified
1842 last time these files were downloaded as well, and instead of just
1843 comparing local file X against server file X, we'll compare local
1844 file X.orig (if extant, else X) against server file X. If -K
1845 _wasn't_ specified last time, or the server contains files called
1846 *.orig, -N will be back to not operating correctly with -k. */
1848 /* Would a single s[n]printf() call be faster? --dan
1850 Definitely not. sprintf() is horribly slow. It's a
1851 different question whether the difference between the two
1852 affects a program. Usually I'd say "no", but at one
1853 point I profiled Wget, and found that a measurable and
1854 non-negligible amount of time was lost calling sprintf()
1855 in url.c. Replacing sprintf with inline calls to
1856 strcpy() and long_to_string() made a difference.
1858 memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len);
1859 memcpy (filename_plus_orig_suffix + filename_len,
1860 ".orig", sizeof (".orig"));
1862 /* Try to stat() the .orig file. */
1863 if (stat (filename_plus_orig_suffix, &st) == 0)
1865 local_dot_orig_file_exists = 1;
1866 local_filename = filename_plus_orig_suffix;
1870 if (!local_dot_orig_file_exists)
1871 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
1872 if (stat (*hstat.local_file, &st) == 0)
1873 local_filename = *hstat.local_file;
1875 if (local_filename != NULL)
1876 /* There was a local file, so we'll check later to see if the version
1877 the server has is the same version we already have, allowing us to
1883 /* Modification time granularity is 2 seconds for Windows, so
1884 increase local time by 1 second for later comparison. */
1887 local_size = st.st_size;
1891 /* Reset the counter. */
1897 /* Increment the pass counter. */
1899 sleep_between_retrievals (count);
1900 /* Get the current time string. */
1901 tms = time_str (NULL);
1902 /* Print fetch message, if opt.verbose. */
1905 char *hurl = url_string (u, 1);
1909 sprintf (tmp, _("(try:%2d)"), count);
1910 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
1911 tms, hurl, tmp, locf);
1913 ws_changetitle (hurl, 1);
1918 /* Default document type is empty. However, if spider mode is
1919 on or time-stamping is employed, HEAD_ONLY commands is
1920 encoded within *dt. */
1921 if (opt.spider || (use_ts && !got_head))
1926 /* Decide whether or not to restart. */
1929 hstat.restval = hstat.len; /* continue where we left off */
1930 else if (opt.always_rest
1931 && stat (locf, &st) == 0
1932 && S_ISREG (st.st_mode))
1933 hstat.restval = st.st_size;
1935 /* Decide whether to send the no-cache directive. We send it in
1937 a) we're using a proxy, and we're past our first retrieval.
1938 Some proxies are notorious for caching incomplete data, so
1939 we require a fresh get.
1940 b) caching is explicitly inhibited. */
1941 if ((proxy && count > 1) /* a */
1942 || !opt.allow_cache /* b */
1944 *dt |= SEND_NOCACHE;
1946 *dt &= ~SEND_NOCACHE;
1948 /* Try fetching the document, or at least its head. */
1949 err = gethttp (u, &hstat, dt, proxy);
1951 /* It's unfortunate that wget determines the local filename before finding
1952 out the Content-Type of the file. Barring a major restructuring of the
1953 code, we need to re-set locf here, since gethttp() may have xrealloc()d
1954 *hstat.local_file to tack on ".html". */
1955 if (!opt.output_document)
1956 locf = *hstat.local_file;
1958 locf = opt.output_document;
1961 tms = time_str (NULL);
1962 /* Get the new location (with or without the redirection). */
1964 *newloc = xstrdup (hstat.newloc);
1967 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1968 case CONERROR: case READERR: case WRITEFAILED:
1970 /* Non-fatal errors continue executing the loop, which will
1971 bring them to "while" statement at the end, to judge
1972 whether the number of tries was exceeded. */
1973 free_hstat (&hstat);
1974 printwhat (count, opt.ntry);
1977 case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED:
1978 case SSLERRCTXCREATE: case CONTNOTSUPPORTED:
1979 /* Fatal errors just return from the function. */
1980 free_hstat (&hstat);
1984 case FWRITEERR: case FOPENERR:
1985 /* Another fatal error. */
1986 logputs (LOG_VERBOSE, "\n");
1987 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1988 *hstat.local_file, strerror (errno));
1989 free_hstat (&hstat);
1994 /* Another fatal error. */
1995 logputs (LOG_VERBOSE, "\n");
1996 logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n"));
1997 free_hstat (&hstat);
2002 /* Return the new location to the caller. */
2005 logprintf (LOG_NOTQUIET,
2006 _("ERROR: Redirection (%d) without location.\n"),
2008 free_hstat (&hstat);
2012 free_hstat (&hstat);
2017 /* The file was already fully retrieved. */
2018 free_hstat (&hstat);
2023 /* Deal with you later. */
2026 /* All possibilities should have been exhausted. */
2029 if (!(*dt & RETROKF))
2033 /* #### Ugly ugly ugly! */
2034 char *hurl = url_string (u, 1);
2035 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
2038 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
2039 tms, hstat.statcode, hstat.error);
2040 logputs (LOG_VERBOSE, "\n");
2041 free_hstat (&hstat);
2046 /* Did we get the time-stamp? */
2049 if (opt.timestamping && !hstat.remote_time)
2051 logputs (LOG_NOTQUIET, _("\
2052 Last-modified header missing -- time-stamps turned off.\n"));
2054 else if (hstat.remote_time)
2056 /* Convert the date-string into struct tm. */
2057 tmr = http_atotm (hstat.remote_time);
2058 if (tmr == (time_t) (-1))
2059 logputs (LOG_VERBOSE, _("\
2060 Last-modified header invalid -- time-stamp ignored.\n"));
2064 /* The time-stamping section. */
2069 use_ts = 0; /* no more time-stamping */
2070 count = 0; /* the retrieve count for HEAD is
2072 if (hstat.remote_time && tmr != (time_t) (-1))
2074 /* Now time-stamping can be used validly. Time-stamping
2075 means that if the sizes of the local and remote file
2076 match, and local file is newer than the remote file,
2077 it will not be retrieved. Otherwise, the normal
2078 download procedure is resumed. */
2080 (hstat.contlen == -1 || local_size == hstat.contlen))
2082 logprintf (LOG_VERBOSE, _("\
2083 Server file no newer than local file `%s' -- not retrieving.\n\n"),
2085 free_hstat (&hstat);
2089 else if (tml >= tmr)
2090 logprintf (LOG_VERBOSE, _("\
2091 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
2093 logputs (LOG_VERBOSE,
2094 _("Remote file is newer, retrieving.\n"));
2096 free_hstat (&hstat);
2099 if ((tmr != (time_t) (-1))
2101 && ((hstat.len == hstat.contlen) ||
2102 ((hstat.res == 0) &&
2103 ((hstat.contlen == -1) ||
2104 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
2106 /* #### This code repeats in http.c and ftp.c. Move it to a
2108 const char *fl = NULL;
2109 if (opt.output_document)
2111 if (output_stream_regular)
2112 fl = opt.output_document;
2115 fl = *hstat.local_file;
2119 /* End of time-stamping section. */
2123 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
2128 tmrate = retr_rate (hstat.rd_size, hstat.dltime, 0);
2130 if (hstat.len == hstat.contlen)
2134 logprintf (LOG_VERBOSE,
2135 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
2136 tms, tmrate, locf, hstat.len, hstat.contlen);
2137 logprintf (LOG_NONVERBOSE,
2138 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
2139 tms, u->url, hstat.len, hstat.contlen, locf, count);
2142 total_downloaded_bytes += hstat.len;
2144 /* Remember that we downloaded the file for later ".orig" code. */
2145 if (*dt & ADDED_HTML_EXTENSION)
2146 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2148 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2150 free_hstat (&hstat);
2154 else if (hstat.res == 0) /* No read error */
2156 if (hstat.contlen == -1) /* We don't know how much we were supposed
2157 to get, so assume we succeeded. */
2161 logprintf (LOG_VERBOSE,
2162 _("%s (%s) - `%s' saved [%ld]\n\n"),
2163 tms, tmrate, locf, hstat.len);
2164 logprintf (LOG_NONVERBOSE,
2165 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
2166 tms, u->url, hstat.len, locf, count);
2169 total_downloaded_bytes += hstat.len;
2171 /* Remember that we downloaded the file for later ".orig" code. */
2172 if (*dt & ADDED_HTML_EXTENSION)
2173 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2175 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2177 free_hstat (&hstat);
2181 else if (hstat.len < hstat.contlen) /* meaning we lost the
2182 connection too soon */
2184 logprintf (LOG_VERBOSE,
2185 _("%s (%s) - Connection closed at byte %ld. "),
2186 tms, tmrate, hstat.len);
2187 printwhat (count, opt.ntry);
2188 free_hstat (&hstat);
2191 else if (!opt.kill_longer) /* meaning we got more than expected */
2193 logprintf (LOG_VERBOSE,
2194 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
2195 tms, tmrate, locf, hstat.len, hstat.contlen);
2196 logprintf (LOG_NONVERBOSE,
2197 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
2198 tms, u->url, hstat.len, hstat.contlen, locf, count);
2200 total_downloaded_bytes += hstat.len;
2202 /* Remember that we downloaded the file for later ".orig" code. */
2203 if (*dt & ADDED_HTML_EXTENSION)
2204 downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf);
2206 downloaded_file(FILE_DOWNLOADED_NORMALLY, locf);
2208 free_hstat (&hstat);
2212 else /* the same, but not accepted */
2214 logprintf (LOG_VERBOSE,
2215 _("%s (%s) - Connection closed at byte %ld/%ld. "),
2216 tms, tmrate, hstat.len, hstat.contlen);
2217 printwhat (count, opt.ntry);
2218 free_hstat (&hstat);
2222 else /* now hstat.res can only be -1 */
2224 if (hstat.contlen == -1)
2226 logprintf (LOG_VERBOSE,
2227 _("%s (%s) - Read error at byte %ld (%s)."),
2228 tms, tmrate, hstat.len, strerror (errno));
2229 printwhat (count, opt.ntry);
2230 free_hstat (&hstat);
2233 else /* hstat.res == -1 and contlen is given */
2235 logprintf (LOG_VERBOSE,
2236 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
2237 tms, tmrate, hstat.len, hstat.contlen,
2239 printwhat (count, opt.ntry);
2240 free_hstat (&hstat);
2247 while (!opt.ntry || (count < opt.ntry));
2251 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
2252 than local timezone.
2254 mktime is similar but assumes struct tm, also known as the
2255 "broken-down" form of time, is in local time zone. mktime_from_utc
2256 uses mktime to make the conversion understanding that an offset
2257 will be introduced by the local time assumption.
2259 mktime_from_utc then measures the introduced offset by applying
2260 gmtime to the initial result and applying mktime to the resulting
2261 "broken-down" form. The difference between the two mktime results
2262 is the measured offset which is then subtracted from the initial
2263 mktime result to yield a calendar time which is the value returned.
2265 tm_isdst in struct tm is set to 0 to force mktime to introduce a
2266 consistent offset (the non DST offset) since tm and tm+o might be
2267 on opposite sides of a DST change.
2269 Some implementations of mktime return -1 for the nonexistent
2270 localtime hour at the beginning of DST. In this event, use
2271 mktime(tm - 1hr) + 3600.
2275 gmtime(t+o) --> tm+o
2276 mktime(tm+o) --> t+2o
2277 t+o - (t+2o - t+o) = t
2279 Note that glibc contains a function of the same purpose named
2280 `timegm' (reverse of gmtime). But obviously, it is not universally
2281 available, and unfortunately it is not straightforwardly
2282 extractable for use here. Perhaps configure should detect timegm
2283 and use it where available.
2285 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
2286 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO.
2287 Further improved by Roger with assistance from Edward J. Sabol
2288 based on input by Jamie Zawinski. */
2291 mktime_from_utc (struct tm *t)
2302 return -1; /* can't deal with output from strptime */
2313 return -1; /* can't deal with output from gmtime */
2316 return (tl - (tb - tl));
2319 /* Check whether the result of strptime() indicates success.
2320 strptime() returns the pointer to how far it got to in the string.
2321 The processing has been successful if the string is at `GMT' or
2322 `+X', or at the end of the string.
2324 In extended regexp parlance, the function returns 1 if P matches
2325 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime
2326 can return) is considered a failure and 0 is returned. */
2328 check_end (const char *p)
2332 while (ISSPACE (*p))
2335 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
2336 || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1])))
2342 /* Convert the textual specification of time in TIME_STRING to the
2343 number of seconds since the Epoch.
2345 TIME_STRING can be in any of the three formats RFC2068 allows the
2346 HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date.
2347 Timezones are ignored, and should be GMT.
2349 Return the computed time_t representation, or -1 if the conversion
2352 This function uses strptime with various string formats for parsing
2353 TIME_STRING. This results in a parser that is not as lenient in
2354 interpreting TIME_STRING as I would like it to be. Being based on
2355 strptime, it always allows shortened months, one-digit days, etc.,
2356 but due to the multitude of formats in which time can be
2357 represented, an ideal HTTP time parser would be even more
2358 forgiving. It should completely ignore things like week days and
2359 concentrate only on the various forms of representing years,
2360 months, days, hours, minutes, and seconds. For example, it would
2361 be nice if it accepted ISO 8601 out of the box.
2363 I've investigated free and PD code for this purpose, but none was
2364 usable. getdate was big and unwieldy, and had potential copyright
2365 issues, or so I was informed. Dr. Marcus Hennecke's atotm(),
2366 distributed with phttpd, is excellent, but we cannot use it because
2367 it is not assigned to the FSF. So I stuck it with strptime. */
2370 http_atotm (const char *time_string)
2372 /* NOTE: Solaris strptime man page claims that %n and %t match white
2373 space, but that's not universally available. Instead, we simply
2374 use ` ' to mean "skip all WS", which works under all strptime
2375 implementations I've tested. */
2377 static const char *time_formats[] = {
2378 "%a, %d %b %Y %T", /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
2379 "%A, %d-%b-%y %T", /* RFC850: Thursday, 29-Jan-98 22:12:57 */
2380 "%a, %d-%b-%Y %T", /* pseudo-RFC850: Thu, 29-Jan-1998 22:12:57
2381 (google.com uses this for their cookies.) */
2382 "%a %b %d %T %Y" /* asctime: Thu Jan 29 22:12:57 1998 */
2388 /* According to Roger Beeman, we need to initialize tm_isdst, since
2389 strptime won't do it. */
2392 /* Note that under foreign locales Solaris strptime() fails to
2393 recognize English dates, which renders this function useless. We
2394 solve this by being careful not to affect LC_TIME when
2395 initializing locale.
2397 Another solution would be to temporarily set locale to C, invoke
2398 strptime(), and restore it back. This is slow and dirty,
2399 however, and locale support other than LC_MESSAGES can mess other
2400 things, so I rather chose to stick with just setting LC_MESSAGES.
2402 GNU strptime does not have this problem because it recognizes
2403 both international and local dates. */
2405 for (i = 0; i < countof (time_formats); i++)
2406 if (check_end (strptime (time_string, time_formats[i], &t)))
2407 return mktime_from_utc (&t);
2409 /* All formats have failed. */
2413 /* Authorization support: We support two authorization schemes:
2415 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
2417 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
2418 consisting of answering to the server's challenge with the proper
2421 /* How many bytes it will take to store LEN bytes in base64. */
2422 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
2424 /* Encode the string S of length LENGTH to base64 format and place it
2425 to STORE. STORE will be 0-terminated, and must point to a writable
2426 buffer of at least 1+BASE64_LENGTH(length) bytes. */
2428 base64_encode (const char *s, char *store, int length)
2430 /* Conversion table. */
2431 static char tbl[64] = {
2432 'A','B','C','D','E','F','G','H',
2433 'I','J','K','L','M','N','O','P',
2434 'Q','R','S','T','U','V','W','X',
2435 'Y','Z','a','b','c','d','e','f',
2436 'g','h','i','j','k','l','m','n',
2437 'o','p','q','r','s','t','u','v',
2438 'w','x','y','z','0','1','2','3',
2439 '4','5','6','7','8','9','+','/'
2442 unsigned char *p = (unsigned char *)store;
2444 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
2445 for (i = 0; i < length; i += 3)
2447 *p++ = tbl[s[0] >> 2];
2448 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
2449 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
2450 *p++ = tbl[s[2] & 0x3f];
2453 /* Pad the result if necessary... */
2454 if (i == length + 1)
2456 else if (i == length + 2)
2457 *(p - 1) = *(p - 2) = '=';
2458 /* ...and zero-terminate it. */
2462 /* Create the authentication header contents for the `Basic' scheme.
2463 This is done by encoding the string `USER:PASS' in base64 and
2464 prepending `HEADER: Basic ' to it. */
2466 basic_authentication_encode (const char *user, const char *passwd)
2468 char *t1, *t2, *res;
2469 int len1 = strlen (user) + 1 + strlen (passwd);
2470 int len2 = BASE64_LENGTH (len1);
2472 t1 = (char *)alloca (len1 + 1);
2473 sprintf (t1, "%s:%s", user, passwd);
2475 t2 = (char *)alloca (len2 + 1);
2476 base64_encode (t1, t2, len1);
2478 res = (char *)xmalloc (6 + len2 + 1);
2479 sprintf (res, "Basic %s", t2);
2484 #define SKIP_WS(x) do { \
2485 while (ISSPACE (*(x))) \
2490 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
2491 of a field in such a header. If the field is the one specified by
2492 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
2493 digest authorization code), extract its value in the (char*)
2494 variable pointed by RET. Returns negative on a malformed header,
2495 or number of bytes that have been parsed by this call. */
2497 extract_header_attr (const char *au, const char *attr_name, char **ret)
2499 const char *cp, *ep;
2503 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
2505 cp += strlen (attr_name);
2518 for (ep = cp; *ep && *ep != '\"'; ep++)
2523 *ret = strdupdelim (cp, ep);
2530 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
2531 an array of 16 bytes containing the hash keys, and BUF should be a
2532 buffer of 33 writable characters (32 for hex digits plus one for
2533 zero termination). */
2535 dump_hash (unsigned char *buf, const unsigned char *hash)
2539 for (i = 0; i < MD5_HASHLEN; i++, hash++)
2541 *buf++ = XNUM_TO_digit (*hash >> 4);
2542 *buf++ = XNUM_TO_digit (*hash & 0xf);
2547 /* Take the line apart to find the challenge, and compose a digest
2548 authorization header. See RFC2069 section 2.1.2. */
2550 digest_authentication_encode (const char *au, const char *user,
2551 const char *passwd, const char *method,
2554 static char *realm, *opaque, *nonce;
2559 { "realm", &realm },
2560 { "opaque", &opaque },
2565 realm = opaque = nonce = NULL;
2567 au += 6; /* skip over `Digest' */
2573 for (i = 0; i < countof (options); i++)
2575 int skip = extract_header_attr (au, options[i].name,
2576 options[i].variable);
2580 xfree_null (opaque);
2590 if (i == countof (options))
2592 while (*au && *au != '=')
2600 while (*au && *au != '\"')
2607 while (*au && *au != ',')
2612 if (!realm || !nonce || !user || !passwd || !path || !method)
2615 xfree_null (opaque);
2620 /* Calculate the digest value. */
2622 ALLOCA_MD5_CONTEXT (ctx);
2623 unsigned char hash[MD5_HASHLEN];
2624 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
2625 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
2627 /* A1BUF = H(user ":" realm ":" password) */
2629 gen_md5_update ((unsigned char *)user, strlen (user), ctx);
2630 gen_md5_update ((unsigned char *)":", 1, ctx);
2631 gen_md5_update ((unsigned char *)realm, strlen (realm), ctx);
2632 gen_md5_update ((unsigned char *)":", 1, ctx);
2633 gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx);
2634 gen_md5_finish (ctx, hash);
2635 dump_hash (a1buf, hash);
2637 /* A2BUF = H(method ":" path) */
2639 gen_md5_update ((unsigned char *)method, strlen (method), ctx);
2640 gen_md5_update ((unsigned char *)":", 1, ctx);
2641 gen_md5_update ((unsigned char *)path, strlen (path), ctx);
2642 gen_md5_finish (ctx, hash);
2643 dump_hash (a2buf, hash);
2645 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
2647 gen_md5_update (a1buf, MD5_HASHLEN * 2, ctx);
2648 gen_md5_update ((unsigned char *)":", 1, ctx);
2649 gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx);
2650 gen_md5_update ((unsigned char *)":", 1, ctx);
2651 gen_md5_update (a2buf, MD5_HASHLEN * 2, ctx);
2652 gen_md5_finish (ctx, hash);
2653 dump_hash (response_digest, hash);
2655 res = (char*) xmalloc (strlen (user)
2660 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
2661 + (opaque ? strlen (opaque) : 0)
2663 sprintf (res, "Digest \
2664 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
2665 user, realm, nonce, path, response_digest);
2668 char *p = res + strlen (res);
2669 strcat (p, ", opaque=\"");
2676 #endif /* USE_DIGEST */
2679 #define BEGINS_WITH(line, string_constant) \
2680 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
2681 && (ISSPACE (line[sizeof (string_constant) - 1]) \
2682 || !line[sizeof (string_constant) - 1]))
2685 known_authentication_scheme_p (const char *au)
2687 return BEGINS_WITH (au, "Basic")
2688 || BEGINS_WITH (au, "Digest")
2689 || BEGINS_WITH (au, "NTLM");
2694 /* Create the HTTP authorization request header. When the
2695 `WWW-Authenticate' response header is seen, according to the
2696 authorization scheme specified in that header (`Basic' and `Digest'
2697 are supported by the current implementation), produce an
2698 appropriate HTTP authorization request header. */
2700 create_authorization_line (const char *au, const char *user,
2701 const char *passwd, const char *method,
2704 if (0 == strncasecmp (au, "Basic", 5))
2705 return basic_authentication_encode (user, passwd);
2707 if (0 == strncasecmp (au, "Digest", 6))
2708 return digest_authentication_encode (au, user, passwd, method, path);
2709 #endif /* USE_DIGEST */