2 Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
4 This file is part of Wget.
6 This program 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 This program 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 this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include <sys/types.h>
36 #if TIME_WITH_SYS_TIME
37 # include <sys/time.h>
41 # include <sys/time.h>
65 extern char *version_string;
75 #define TEXTHTML_S "text/html"
76 #define HTTP_ACCEPT "*/*"
78 /* Some status code validation macros: */
79 #define H_20X(x) (((x) >= 200) && ((x) < 300))
80 #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS)
81 #define H_REDIRECTED(x) (((x) == HTTP_STATUS_MOVED_PERMANENTLY) \
82 || ((x) == HTTP_STATUS_MOVED_TEMPORARILY))
84 /* HTTP/1.0 status codes from RFC1945, provided for reference. */
86 #define HTTP_STATUS_OK 200
87 #define HTTP_STATUS_CREATED 201
88 #define HTTP_STATUS_ACCEPTED 202
89 #define HTTP_STATUS_NO_CONTENT 204
90 #define HTTP_STATUS_PARTIAL_CONTENTS 206
92 /* Redirection 3xx. */
93 #define HTTP_STATUS_MULTIPLE_CHOICES 300
94 #define HTTP_STATUS_MOVED_PERMANENTLY 301
95 #define HTTP_STATUS_MOVED_TEMPORARILY 302
96 #define HTTP_STATUS_NOT_MODIFIED 304
98 /* Client error 4xx. */
99 #define HTTP_STATUS_BAD_REQUEST 400
100 #define HTTP_STATUS_UNAUTHORIZED 401
101 #define HTTP_STATUS_FORBIDDEN 403
102 #define HTTP_STATUS_NOT_FOUND 404
104 /* Server errors 5xx. */
105 #define HTTP_STATUS_INTERNAL 500
106 #define HTTP_STATUS_NOT_IMPLEMENTED 501
107 #define HTTP_STATUS_BAD_GATEWAY 502
108 #define HTTP_STATUS_UNAVAILABLE 503
111 /* Parse the HTTP status line, which is of format:
113 HTTP-Version SP Status-Code SP Reason-Phrase
115 The function returns the status-code, or -1 if the status line is
116 malformed. The pointer to reason-phrase is returned in RP. */
118 parse_http_status_line (const char *line, const char **reason_phrase_ptr)
120 /* (the variables must not be named `major' and `minor', because
121 that breaks compilation with SunOS4 cc.) */
122 int mjr, mnr, statcode;
125 *reason_phrase_ptr = NULL;
127 /* The standard format of HTTP-Version is: `HTTP/X.Y', where X is
128 major version, and Y is minor version. */
129 if (strncmp (line, "HTTP/", 5) != 0)
133 /* Calculate major HTTP version. */
135 for (mjr = 0; ISDIGIT (*line); line++)
136 mjr = 10 * mjr + (*line - '0');
137 if (*line != '.' || p == line)
141 /* Calculate minor HTTP version. */
143 for (mnr = 0; ISDIGIT (*line); line++)
144 mnr = 10 * mnr + (*line - '0');
145 if (*line != ' ' || p == line)
147 /* Wget will accept only 1.0 and higher HTTP-versions. The value of
148 minor version can be safely ignored. */
153 /* Calculate status code. */
154 if (!(ISDIGIT (*line) && ISDIGIT (line[1]) && ISDIGIT (line[2])))
156 statcode = 100 * (*line - '0') + 10 * (line[1] - '0') + (line[2] - '0');
158 /* Set up the reason phrase pointer. */
160 /* RFC2068 requires SPC here, but we allow the string to finish
161 here, in case no reason-phrase is present. */
165 *reason_phrase_ptr = line;
170 *reason_phrase_ptr = line + 1;
175 /* Functions to be used as arguments to header_process(): */
177 struct http_process_range_closure {
183 /* Parse the `Content-Range' header and extract the information it
184 contains. Returns 1 if successful, -1 otherwise. */
186 http_process_range (const char *hdr, void *arg)
188 struct http_process_range_closure *closure
189 = (struct http_process_range_closure *)arg;
192 /* Certain versions of Nutscape proxy server send out
193 `Content-Length' without "bytes" specifier, which is a breach of
194 RFC2068 (as well as the HTTP/1.1 draft which was current at the
195 time). But hell, I must support it... */
196 if (!strncasecmp (hdr, "bytes", 5))
199 hdr += skip_lws (hdr);
205 for (num = 0; ISDIGIT (*hdr); hdr++)
206 num = 10 * num + (*hdr - '0');
207 if (*hdr != '-' || !ISDIGIT (*(hdr + 1)))
209 closure->first_byte_pos = num;
211 for (num = 0; ISDIGIT (*hdr); hdr++)
212 num = 10 * num + (*hdr - '0');
213 if (*hdr != '/' || !ISDIGIT (*(hdr + 1)))
215 closure->last_byte_pos = num;
217 for (num = 0; ISDIGIT (*hdr); hdr++)
218 num = 10 * num + (*hdr - '0');
219 closure->entity_length = num;
223 /* Place 1 to ARG if the HDR contains the word "none", 0 otherwise.
224 Used for `Accept-Ranges'. */
226 http_process_none (const char *hdr, void *arg)
228 int *where = (int *)arg;
230 if (strstr (hdr, "none"))
237 /* Place the malloc-ed copy of HDR hdr, to the first `;' to ARG. */
239 http_process_type (const char *hdr, void *arg)
241 char **result = (char **)arg;
244 p = strrchr (hdr, ';');
248 *result = (char *)xmalloc (len + 1);
249 memcpy (*result, hdr, len);
250 (*result)[len] = '\0';
253 *result = xstrdup (hdr);
260 long len; /* received length */
261 long contlen; /* expected length */
262 long restval; /* the restart value */
263 int res; /* the result of last read */
264 char *newloc; /* new location (redirection) */
265 char *remote_time; /* remote time-stamp string */
266 char *error; /* textual HTTP error */
267 int statcode; /* status code */
268 long dltime; /* time of the download */
271 /* Free the elements of hstat X. */
272 #define FREEHSTAT(x) do \
274 FREE_MAYBE ((x).newloc); \
275 FREE_MAYBE ((x).remote_time); \
276 FREE_MAYBE ((x).error); \
277 (x).newloc = (x).remote_time = (x).error = NULL; \
280 static char *create_authorization_line PARAMS ((const char *, const char *,
281 const char *, const char *,
283 static char *basic_authentication_encode PARAMS ((const char *, const char *,
285 static int known_authentication_scheme_p PARAMS ((const char *));
287 static time_t http_atotm PARAMS ((char *));
289 /* Retrieve a document through HTTP protocol. It recognizes status
290 code, and correctly handles redirections. It closes the network
291 socket. If it receives an error from the functions below it, it
292 will print it if there is enough information to do so (almost
293 always), returning the error to the caller (i.e. http_loop).
295 Various HTTP parameters are stored to hs. Although it parses the
296 response code correctly, it is not used in a sane way. The caller
299 If u->proxy is non-NULL, the URL u will be taken as a proxy URL,
300 and u->proxy->url will be given to the proxy server (bad naming,
303 gethttp (struct urlinfo *u, struct http_stat *hs, int *dt)
305 char *request, *type, *command, *path;
307 char *pragma_h, *referer, *useragent, *range, *wwwauth, *remhost;
308 char *authenticate_h;
313 int sock, hcount, num_written, all_length, remport, statcode;
314 long contlen, contrange;
318 int auth_tried_already;
321 /* Let the others worry about local filename... */
322 if (!(*dt & HEAD_ONLY))
323 assert (u->local != NULL);
326 auth_tried_already = 0;
329 /* We need to come back here when the initial attempt to retrieve
330 without authorization header fails. */
332 /* Initialize certain elements of struct hstat. */
337 hs->remote_time = NULL;
340 /* Which structure to use to retrieve the original URL data. */
346 /* First: establish the connection. */
347 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "), u->host, u->port);
348 err = make_connection (&sock, u->host, u->port);
352 logputs (LOG_VERBOSE, "\n");
353 logprintf (LOG_NOTQUIET, "%s: %s.\n", u->host, herrmsg (h_errno));
357 logputs (LOG_VERBOSE, "\n");
358 logprintf (LOG_NOTQUIET, "socket: %s\n", strerror (errno));
362 logputs (LOG_VERBOSE, "\n");
363 logprintf (LOG_NOTQUIET,
364 _("Connection to %s:%hu refused.\n"), u->host, u->port);
368 logputs (LOG_VERBOSE, "\n");
369 logprintf (LOG_NOTQUIET, "connect: %s\n", strerror (errno));
374 /* Everything is fine! */
375 logputs (LOG_VERBOSE, _("connected!\n"));
383 path = u->proxy->url;
387 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
391 referer = (char *)alloca (9 + strlen (ou->referer) + 3);
392 sprintf (referer, "Referer: %s\r\n", ou->referer);
394 if (*dt & SEND_NOCACHE)
395 pragma_h = "Pragma: no-cache\r\n";
400 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
401 /* #### Gag me! Some servers (e.g. WebSitePro) have been known
402 to misinterpret the following `Range' format, and return the
403 document as multipart/x-byte-ranges MIME type!
405 #### TODO: Interpret MIME types, recognize bullshits similar
406 the one described above, and deal with them! */
407 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
412 STRDUP_ALLOCA (useragent, opt.useragent);
415 useragent = (char *)alloca (10 + strlen (version_string));
416 sprintf (useragent, "Wget/%s", version_string);
418 /* Construct the authentication, if userid is present. */
421 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
422 user = user ? user : opt.http_user;
423 passwd = passwd ? passwd : opt.http_passwd;
426 if (authenticate_h && user && passwd)
428 wwwauth = create_authorization_line (authenticate_h, user, passwd,
435 char *proxy_user, *proxy_passwd;
436 /* For normal username and password, URL components override
437 command-line/wgetrc parameters. With proxy authentication,
438 it's the reverse, because proxy URLs are normally the
439 "permanent" ones, so command-line args should take
441 if (opt.proxy_user && opt.proxy_passwd)
443 proxy_user = opt.proxy_user;
444 proxy_passwd = opt.proxy_passwd;
448 proxy_user = u->user;
449 proxy_passwd = u->passwd;
451 /* #### This is junky. Can't the proxy request, say, `Digest'
453 if (proxy_user && proxy_passwd)
454 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
455 "Proxy-Authorization");
467 host_port = (char *)alloca (numdigit (remport) + 2);
468 host_port_len = sprintf (host_port, ":%d", remport);
471 /* Allocate the memory for the request. */
472 request = (char *)alloca (strlen (command) + strlen (path)
474 + strlen (remhost) + host_port_len
475 + strlen (HTTP_ACCEPT)
476 + (referer ? strlen (referer) : 0)
477 + (wwwauth ? strlen (wwwauth) : 0)
478 + (proxyauth ? strlen (proxyauth) : 0)
479 + (range ? strlen (range) : 0)
481 + (opt.user_header ? strlen (opt.user_header) : 0)
483 /* Construct the request. */
490 command, path, useragent, remhost,
491 host_port ? host_port : "",
492 HTTP_ACCEPT, referer ? referer : "",
493 wwwauth ? wwwauth : "",
494 proxyauth ? proxyauth : "",
497 opt.user_header ? opt.user_header : "");
498 DEBUGP (("---request begin---\n%s---request end---\n", request));
499 /* Free the temporary memory. */
500 FREE_MAYBE (wwwauth);
501 FREE_MAYBE (proxyauth);
503 /* Send the request to server. */
504 num_written = iwrite (sock, request, strlen (request));
507 logputs (LOG_VERBOSE, _("Failed writing HTTP request.\n"));
512 logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "),
513 u->proxy ? "Proxy" : "HTTP");
514 contlen = contrange = -1;
519 /* Before reading anything, initialize the rbuf. */
520 rbuf_initialize (&rbuf, sock);
524 /* Header-fetching loop. */
532 /* Get the header. */
533 status = header_get (&rbuf, &hdr,
534 /* Disallow continuations for status line. */
535 (hcount == 1 ? HG_NO_CONTINUATIONS : HG_NONE));
537 /* Check for errors. */
538 if (status == HG_EOF && *hdr)
540 /* This used to be an unconditional error, but that was
541 somewhat controversial, because of a large number of
542 broken CGI's that happily "forget" to send the second EOL
543 before closing the connection of a HEAD request.
545 So, the deal is to check whether the header is empty
546 (*hdr is zero if it is); if yes, it means that the
547 previous header was fully retrieved, and that -- most
548 probably -- the request is complete. "...be liberal in
549 what you accept." Oh boy. */
550 logputs (LOG_VERBOSE, "\n");
551 logputs (LOG_NOTQUIET, _("End of file while parsing headers.\n"));
554 FREE_MAYBE (hs->newloc);
555 FREE_MAYBE (all_headers);
559 else if (status == HG_ERROR)
561 logputs (LOG_VERBOSE, "\n");
562 logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"),
566 FREE_MAYBE (hs->newloc);
567 FREE_MAYBE (all_headers);
572 /* If the headers are to be saved to a file later, save them to
574 if (opt.save_headers)
576 int lh = strlen (hdr);
577 all_headers = (char *)xrealloc (all_headers, all_length + lh + 2);
578 memcpy (all_headers + all_length, hdr, lh);
580 all_headers[all_length++] = '\n';
581 all_headers[all_length] = '\0';
584 /* Print the header if requested. */
585 if (opt.server_response && hcount != 1)
586 logprintf (LOG_VERBOSE, "\n%d %s", hcount, hdr);
588 /* Check for status line. */
592 /* Parse the first line of server response. */
593 statcode = parse_http_status_line (hdr, &error);
594 hs->statcode = statcode;
595 /* Store the descriptive response. */
596 if (statcode == -1) /* malformed response */
598 /* A common reason for "malformed response" error is the
599 case when no data was actually received. Handle this
602 hs->error = xstrdup (_("No data received"));
604 hs->error = xstrdup (_("Malformed status line"));
609 hs->error = xstrdup (_("(no description)"));
611 hs->error = xstrdup (error);
618 logprintf (LOG_VERBOSE, "%d %s", statcode, error);
623 /* Exit on empty header. */
630 /* Try getting content-length. */
631 if (contlen == -1 && !opt.ignore_length)
632 if (header_process (hdr, "Content-Length", header_extract_number,
635 /* Try getting content-type. */
637 if (header_process (hdr, "Content-Type", http_process_type, &type))
639 /* Try getting location. */
641 if (header_process (hdr, "Location", header_strdup, &hs->newloc))
643 /* Try getting last-modified. */
644 if (!hs->remote_time)
645 if (header_process (hdr, "Last-Modified", header_strdup,
648 /* Try getting www-authentication. */
650 if (header_process (hdr, "WWW-Authenticate", header_strdup,
653 /* Check for accept-ranges header. If it contains the word
654 `none', disable the ranges. */
655 if (*dt & ACCEPTRANGES)
658 if (header_process (hdr, "Accept-Ranges", http_process_none, &nonep))
661 *dt &= ~ACCEPTRANGES;
665 /* Try getting content-range. */
668 struct http_process_range_closure closure;
669 if (header_process (hdr, "Content-Range", http_process_range, &closure))
671 contrange = closure.first_byte_pos;
679 logputs (LOG_VERBOSE, "\n");
681 if ((statcode == HTTP_STATUS_UNAUTHORIZED)
684 /* Authorization is required. */
689 if (auth_tried_already)
691 /* If we have tried it already, then there is not point
693 logputs (LOG_NOTQUIET, _("Authorization failed.\n"));
694 free (authenticate_h);
697 else if (!known_authentication_scheme_p (authenticate_h))
699 free (authenticate_h);
700 logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n"));
705 auth_tried_already = 1;
709 /* We do not need this anymore. */
712 free (authenticate_h);
713 authenticate_h = NULL;
716 /* 20x responses are counted among successful by default. */
717 if (H_20X (statcode))
720 if (type && !strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)))
723 /* We don't assume text/html by default. */
728 else if (contrange != hs->restval ||
729 (H_PARTIAL (statcode) && contrange == -1))
731 /* This means the whole request was somehow misunderstood by the
734 FREE_MAYBE (hs->newloc);
735 FREE_MAYBE (all_headers);
743 contlen += contrange;
745 contrange = -1; /* If conent-length was not sent,
746 content-range will be ignored. */
748 hs->contlen = contlen;
750 /* Return if redirected. */
751 if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES)
753 /* RFC2068 says that in case of the 300 (multiple choices)
754 response, the server can output a preferred URL through
755 `Location' header; otherwise, the request should be treated
756 like GET. So, if the location is set, it will be a
757 redirection; otherwise, just proceed normally. */
758 if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc)
762 logprintf (LOG_VERBOSE,
763 _("Location: %s%s\n"),
764 hs->newloc ? hs->newloc : _("unspecified"),
765 hs->newloc ? _(" [following]") : "");
768 FREE_MAYBE (all_headers);
774 if ((*dt & RETROKF) && !opt.server_response)
776 /* No need to print this output if the body won't be
777 downloaded at all, or if the original server response is
779 logputs (LOG_VERBOSE, _("Length: "));
782 logputs (LOG_VERBOSE, legible (contlen));
784 logprintf (LOG_VERBOSE, _(" (%s to go)"),
785 legible (contlen - contrange));
788 logputs (LOG_VERBOSE,
789 opt.ignore_length ? _("ignored") : _("unspecified"));
791 logprintf (LOG_VERBOSE, " [%s]\n", type);
793 logputs (LOG_VERBOSE, "\n");
797 type = NULL; /* We don't need it any more. */
799 /* Return if we have no intention of further downloading. */
800 if (!(*dt & RETROKF) || (*dt & HEAD_ONLY))
802 /* In case someone cares to look... */
806 FREE_MAYBE (all_headers);
811 /* Open the local file. */
814 mkalldirs (u->local);
816 rotate_backups (u->local);
817 fp = fopen (u->local, hs->restval ? "ab" : "wb");
820 logprintf (LOG_NOTQUIET, "%s: %s\n", u->local, strerror (errno));
822 FREE_MAYBE (all_headers);
829 /* #### This confuses the code that checks for file size. There
830 should be some overhead information. */
831 if (opt.save_headers)
832 fwrite (all_headers, 1, all_length, fp);
834 /* Get the contents of the document. */
835 hs->res = get_contents (sock, fp, &hs->len, hs->restval,
836 (contlen != -1 ? contlen : 0),
838 hs->dltime = elapsed_time ();
843 FREE_MAYBE (all_headers);
850 /* The genuine HTTP loop! This is the part where the retrieval is
851 retried, and retried, and retried, and... */
853 http_loop (struct urlinfo *u, char **newloc, int *dt)
855 static int first_retrieval = 1;
858 int local_dot_orig_file_exists = FALSE;
859 int use_ts, got_head = 0; /* time-stamping info */
860 char *tms, *suf, *locf, *tmrate;
862 time_t tml = -1, tmr = -1; /* local and remote time-stamps */
863 long local_size = 0; /* the size of the local file */
864 struct http_stat hstat; /* HTTP status */
869 /* Warn on (likely bogus) wildcard usage in HTTP. Don't use
870 has_wildcards_p because it would also warn on `?', and we know that
871 shows up in CGI paths a *lot*. */
872 if (strchr (u->url, '*'))
873 logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n"));
875 /* Determine the local filename. */
877 u->local = url_filename (u->proxy ? u->proxy : u);
879 if (!opt.output_document)
882 locf = opt.output_document;
884 if (opt.noclobber && file_exists_p (u->local))
886 /* If opt.noclobber is turned on and file already exists, do not
888 logprintf (LOG_VERBOSE, _("\
889 File `%s' already there, will not retrieve.\n"), u->local);
890 /* If the file is there, we suppose it's retrieved OK. */
893 /* #### Bogusness alert. */
894 /* If its suffix is "html" or (yuck!) "htm", we suppose it's
895 text/html, a harmless lie. */
896 if (((suf = suffix (u->local)) != NULL)
897 && (!strcmp (suf, "html") || !strcmp (suf, "htm")))
900 /* Another harmless lie: */
905 if (opt.timestamping)
907 boolean local_file_exists = FALSE;
909 if (opt.backup_converted)
910 /* If -K is specified, we'll act on the assumption that it was specified
911 last time these files were downloaded as well, and instead of just
912 comparing local file X against server file X, we'll compare local
913 file X.orig (if extant, else X) against server file X. If -K
914 _wasn't_ specified last time, or the server contains files called
915 *.orig, -N will be back to not operating correctly with -k. */
917 size_t filename_len = strlen(u->local);
918 char* filename_plus_orig_suffix = malloc(filename_len +
921 /* Would a single s[n]printf() call be faster? */
922 strcpy(filename_plus_orig_suffix, u->local);
923 strcpy(filename_plus_orig_suffix + filename_len, ".orig");
925 /* Try to stat() the .orig file. */
926 if (stat(filename_plus_orig_suffix, &st) == 0)
928 local_file_exists = TRUE;
929 local_dot_orig_file_exists = TRUE;
932 free(filename_plus_orig_suffix);
935 if (!local_dot_orig_file_exists)
936 /* Couldn't stat() <file>.orig, so try to stat() <file>. */
937 if (stat (u->local, &st) == 0)
938 local_file_exists = TRUE;
940 if (local_file_exists)
941 /* There was a local file, so we'll check later to see if the version
942 the server has is the same version we already have, allowing us to
947 local_size = st.st_size;
951 /* Reset the counter. */
953 *dt = 0 | ACCEPTRANGES;
957 /* Increment the pass counter. */
959 /* Wait before the retrieval (unless this is the very first
961 Check if we are retrying or not, wait accordingly - HEH */
962 if (!first_retrieval && (opt.wait || (count && opt.waitretry)))
966 if (count<opt.waitretry)
969 sleep(opt.waitretry);
976 /* Get the current time string. */
977 tms = time_str (NULL);
978 /* Print fetch message, if opt.verbose. */
981 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
985 sprintf (tmp, _("(try:%2d)"), count);
986 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
987 tms, hurl, tmp, locf);
989 ws_changetitle (hurl, 1);
994 /* Default document type is empty. However, if spider mode is
995 on or time-stamping is employed, HEAD_ONLY commands is
996 encoded within *dt. */
997 if (opt.spider || (use_ts && !got_head))
1001 /* Assume no restarting. */
1003 /* Decide whether or not to restart. */
1004 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
1005 && file_exists_p (u->local))
1006 if (stat (u->local, &st) == 0)
1007 hstat.restval = st.st_size;
1008 /* Decide whether to send the no-cache directive. */
1009 if (u->proxy && (count > 1 || (opt.proxy_cache == 0)))
1010 *dt |= SEND_NOCACHE;
1012 *dt &= ~SEND_NOCACHE;
1014 /* Try fetching the document, or at least its head. :-) */
1015 err = gethttp (u, &hstat, dt);
1017 tms = time_str (NULL);
1018 /* Get the new location (with or without the redirection). */
1020 *newloc = xstrdup (hstat.newloc);
1023 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1024 case CONERROR: case READERR: case WRITEFAILED:
1026 /* Non-fatal errors continue executing the loop, which will
1027 bring them to "while" statement at the end, to judge
1028 whether the number of tries was exceeded. */
1030 printwhat (count, opt.ntry);
1033 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1034 /* Fatal errors just return from the function. */
1038 case FWRITEERR: case FOPENERR:
1039 /* Another fatal error. */
1040 logputs (LOG_VERBOSE, "\n");
1041 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1042 u->local, strerror (errno));
1047 /* Return the new location to the caller. */
1050 logprintf (LOG_NOTQUIET,
1051 _("ERROR: Redirection (%d) without location.\n"),
1059 /* Deal with you later. */
1062 /* All possibilities should have been exhausted. */
1065 if (!(*dt & RETROKF))
1069 /* #### Ugly ugly ugly! */
1070 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1071 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1074 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1075 tms, hstat.statcode, hstat.error);
1076 logputs (LOG_VERBOSE, "\n");
1081 /* Did we get the time-stamp? */
1084 if (opt.timestamping && !hstat.remote_time)
1086 logputs (LOG_NOTQUIET, _("\
1087 Last-modified header missing -- time-stamps turned off.\n"));
1089 else if (hstat.remote_time)
1091 /* Convert the date-string into struct tm. */
1092 tmr = http_atotm (hstat.remote_time);
1093 if (tmr == (time_t) (-1))
1094 logputs (LOG_VERBOSE, _("\
1095 Last-modified header invalid -- time-stamp ignored.\n"));
1099 /* The time-stamping section. */
1104 use_ts = 0; /* no more time-stamping */
1105 count = 0; /* the retrieve count for HEAD is
1107 if (hstat.remote_time && tmr != (time_t) (-1))
1109 /* Now time-stamping can be used validly. Time-stamping
1110 means that if the sizes of the local and remote file
1111 match, and local file is newer than the remote file,
1112 it will not be retrieved. Otherwise, the normal
1113 download procedure is resumed. */
1115 (hstat.contlen == -1 || local_size == hstat.contlen))
1117 if (local_dot_orig_file_exists)
1118 /* We can't collapse this down into just one logprintf()
1119 call with a variable set to u->local or the .orig
1120 filename because we have to malloc() space for the
1121 latter, and because there are multiple returns above (a
1122 coding style no-no by many measures, for reasons such as
1123 this) we'd have to remember to free() the string at each
1124 one to avoid a memory leak. */
1125 logprintf (LOG_VERBOSE, _("\
1126 Server file no newer than local file `%s.orig' -- not retrieving.\n\n"),
1129 logprintf (LOG_VERBOSE, _("\
1130 Server file no newer than local file `%s' -- not retrieving.\n\n"), u->local);
1134 else if (tml >= tmr)
1135 logprintf (LOG_VERBOSE, _("\
1136 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1138 logputs (LOG_VERBOSE,
1139 _("Remote file is newer, retrieving.\n"));
1145 && (tmr != (time_t) (-1))
1147 && ((hstat.len == hstat.contlen) ||
1148 ((hstat.res == 0) &&
1149 ((hstat.contlen == -1) ||
1150 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1152 touch (u->local, tmr);
1154 /* End of time-stamping section. */
1158 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1162 /* It is now safe to free the remainder of hstat, since the
1163 strings within it will no longer be used. */
1166 tmrate = rate (hstat.len - hstat.restval, hstat.dltime);
1168 if (hstat.len == hstat.contlen)
1172 logprintf (LOG_VERBOSE,
1173 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1174 tms, tmrate, locf, hstat.len, hstat.contlen);
1175 logprintf (LOG_NONVERBOSE,
1176 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1177 tms, u->url, hstat.len, hstat.contlen, locf, count);
1180 opt.downloaded += hstat.len;
1181 downloaded_file(ADD_FILE, locf);
1184 else if (hstat.res == 0) /* No read error */
1186 if (hstat.contlen == -1) /* We don't know how much we were supposed
1187 to get, so assume we succeeded. */
1191 logprintf (LOG_VERBOSE,
1192 _("%s (%s) - `%s' saved [%ld]\n\n"),
1193 tms, tmrate, locf, hstat.len);
1194 logprintf (LOG_NONVERBOSE,
1195 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1196 tms, u->url, hstat.len, locf, count);
1199 opt.downloaded += hstat.len;
1200 downloaded_file(ADD_FILE, locf);
1203 else if (hstat.len < hstat.contlen) /* meaning we lost the
1204 connection too soon */
1206 logprintf (LOG_VERBOSE,
1207 _("%s (%s) - Connection closed at byte %ld. "),
1208 tms, tmrate, hstat.len);
1209 printwhat (count, opt.ntry);
1212 else if (!opt.kill_longer) /* meaning we got more than expected */
1214 logprintf (LOG_VERBOSE,
1215 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1216 tms, tmrate, locf, hstat.len, hstat.contlen);
1217 logprintf (LOG_NONVERBOSE,
1218 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1219 tms, u->url, hstat.len, hstat.contlen, locf, count);
1221 opt.downloaded += hstat.len;
1222 downloaded_file(ADD_FILE, locf);
1225 else /* the same, but not accepted */
1227 logprintf (LOG_VERBOSE,
1228 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1229 tms, tmrate, hstat.len, hstat.contlen);
1230 printwhat (count, opt.ntry);
1234 else /* now hstat.res can only be -1 */
1236 if (hstat.contlen == -1)
1238 logprintf (LOG_VERBOSE,
1239 _("%s (%s) - Read error at byte %ld (%s)."),
1240 tms, tmrate, hstat.len, strerror (errno));
1241 printwhat (count, opt.ntry);
1244 else /* hstat.res == -1 and contlen is given */
1246 logprintf (LOG_VERBOSE,
1247 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1248 tms, tmrate, hstat.len, hstat.contlen,
1250 printwhat (count, opt.ntry);
1257 while (!opt.ntry || (count < opt.ntry));
1261 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1262 than local timezone (mktime assumes the latter).
1264 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1265 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO. */
1267 mktime_from_utc (struct tm *t)
1274 tb = mktime (gmtime (&tl));
1275 return (tl <= tb ? (tl + (tl - tb)) : (tl - (tb - tl)));
1278 /* Check whether the result of strptime() indicates success.
1279 strptime() returns the pointer to how far it got to in the string.
1280 The processing has been successful if the string is at `GMT' or
1281 `+X', or at the end of the string.
1283 In extended regexp parlance, the function returns 1 if P matches
1284 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (a valid result of
1285 strptime()) is considered a failure and 0 is returned. */
1291 while (ISSPACE (*p))
1294 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1295 || ((p[0] == '+' || p[1] == '-') && ISDIGIT (p[1])))
1301 /* Convert TIME_STRING time to time_t. TIME_STRING can be in any of
1302 the three formats RFC2068 allows the HTTP servers to emit --
1303 RFC1123-date, RFC850-date or asctime-date. Timezones are ignored,
1306 We use strptime() to recognize various dates, which makes it a
1307 little bit slacker than the RFC1123/RFC850/asctime (e.g. it always
1308 allows shortened dates and months, one-digit days, etc.). It also
1309 allows more than one space anywhere where the specs require one SP.
1310 The routine should probably be even more forgiving (as recommended
1311 by RFC2068), but I do not have the time to write one.
1313 Return the computed time_t representation, or -1 if all the
1316 Needless to say, what we *really* need here is something like
1317 Marcus Hennecke's atotm(), which is forgiving, fast, to-the-point,
1318 and does not use strptime(). atotm() is to be found in the sources
1319 of `phttpd', a little-known HTTP server written by Peter Erikson. */
1321 http_atotm (char *time_string)
1325 /* Roger Beeman says: "This function dynamically allocates struct tm
1326 t, but does no initialization. The only field that actually
1327 needs initialization is tm_isdst, since the others will be set by
1328 strptime. Since strptime does not set tm_isdst, it will return
1329 the data structure with whatever data was in tm_isdst to begin
1330 with. For those of us in timezones where DST can occur, there
1331 can be a one hour shift depending on the previous contents of the
1332 data area where the data structure is allocated." */
1335 /* Note that under foreign locales Solaris strptime() fails to
1336 recognize English dates, which renders this function useless. I
1337 assume that other non-GNU strptime's are plagued by the same
1338 disease. We solve this by setting only LC_MESSAGES in
1339 i18n_initialize(), instead of LC_ALL.
1341 Another solution could be to temporarily set locale to C, invoke
1342 strptime(), and restore it back. This is slow and dirty,
1343 however, and locale support other than LC_MESSAGES can mess other
1344 things, so I rather chose to stick with just setting LC_MESSAGES.
1346 Also note that none of this is necessary under GNU strptime(),
1347 because it recognizes both international and local dates. */
1349 /* NOTE: We don't use `%n' for white space, as OSF's strptime uses
1350 it to eat all white space up to (and including) a newline, and
1351 the function fails if there is no newline (!).
1353 Let's hope all strptime() implementations use ` ' to skip *all*
1354 whitespace instead of just one (it works that way on all the
1355 systems I've tested it on). */
1357 /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1358 if (check_end (strptime (time_string, "%a, %d %b %Y %T", &t)))
1359 return mktime_from_utc (&t);
1360 /* RFC850: Thu, 29-Jan-98 22:12:57 */
1361 if (check_end (strptime (time_string, "%a, %d-%b-%y %T", &t)))
1362 return mktime_from_utc (&t);
1363 /* asctime: Thu Jan 29 22:12:57 1998 */
1364 if (check_end (strptime (time_string, "%a %b %d %T %Y", &t)))
1365 return mktime_from_utc (&t);
1370 /* Authorization support: We support two authorization schemes:
1372 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
1374 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
1375 consisting of answering to the server's challenge with the proper
1378 /* How many bytes it will take to store LEN bytes in base64. */
1379 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
1381 /* Encode the string S of length LENGTH to base64 format and place it
1382 to STORE. STORE will be 0-terminated, and must point to a writable
1383 buffer of at least 1+BASE64_LENGTH(length) bytes. */
1385 base64_encode (const char *s, char *store, int length)
1387 /* Conversion table. */
1388 static char tbl[64] = {
1389 'A','B','C','D','E','F','G','H',
1390 'I','J','K','L','M','N','O','P',
1391 'Q','R','S','T','U','V','W','X',
1392 'Y','Z','a','b','c','d','e','f',
1393 'g','h','i','j','k','l','m','n',
1394 'o','p','q','r','s','t','u','v',
1395 'w','x','y','z','0','1','2','3',
1396 '4','5','6','7','8','9','+','/'
1399 unsigned char *p = (unsigned char *)store;
1401 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
1402 for (i = 0; i < length; i += 3)
1404 *p++ = tbl[s[0] >> 2];
1405 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
1406 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
1407 *p++ = tbl[s[2] & 0x3f];
1410 /* Pad the result if necessary... */
1411 if (i == length + 1)
1413 else if (i == length + 2)
1414 *(p - 1) = *(p - 2) = '=';
1415 /* ...and zero-terminate it. */
1419 /* Create the authentication header contents for the `Basic' scheme.
1420 This is done by encoding the string `USER:PASS' in base64 and
1421 prepending `HEADER: Basic ' to it. */
1423 basic_authentication_encode (const char *user, const char *passwd,
1426 char *t1, *t2, *res;
1427 int len1 = strlen (user) + 1 + strlen (passwd);
1428 int len2 = BASE64_LENGTH (len1);
1430 t1 = (char *)alloca (len1 + 1);
1431 sprintf (t1, "%s:%s", user, passwd);
1432 t2 = (char *)alloca (1 + len2);
1433 base64_encode (t1, t2, len1);
1434 res = (char *)malloc (len2 + 11 + strlen (header));
1435 sprintf (res, "%s: Basic %s\r\n", header, t2);
1441 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
1442 of a field in such a header. If the field is the one specified by
1443 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
1444 digest authorization code), extract its value in the (char*)
1445 variable pointed by RET. Returns negative on a malformed header,
1446 or number of bytes that have been parsed by this call. */
1448 extract_header_attr (const char *au, const char *attr_name, char **ret)
1450 const char *cp, *ep;
1454 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
1456 cp += strlen (attr_name);
1459 cp += skip_lws (cp);
1464 cp += skip_lws (cp);
1469 for (ep = cp; *ep && *ep != '\"'; ep++)
1474 *ret = strdupdelim (cp, ep);
1481 /* Response value needs to be in lowercase, so we cannot use HEXD2ASC
1482 from url.h. See RFC 2069 2.1.2 for the syntax of response-digest. */
1483 #define HEXD2asc(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
1485 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
1486 an array of 16 bytes containing the hash keys, and BUF should be a
1487 buffer of 33 writable characters (32 for hex digits plus one for
1488 zero termination). */
1490 dump_hash (unsigned char *buf, const unsigned char *hash)
1494 for (i = 0; i < MD5_HASHLEN; i++, hash++)
1496 *buf++ = HEXD2asc (*hash >> 4);
1497 *buf++ = HEXD2asc (*hash & 0xf);
1502 /* Take the line apart to find the challenge, and compose a digest
1503 authorization header. See RFC2069 section 2.1.2. */
1505 digest_authentication_encode (const char *au, const char *user,
1506 const char *passwd, const char *method,
1509 static char *realm, *opaque, *nonce;
1514 { "realm", &realm },
1515 { "opaque", &opaque },
1520 realm = opaque = nonce = NULL;
1522 au += 6; /* skip over `Digest' */
1527 au += skip_lws (au);
1528 for (i = 0; i < ARRAY_SIZE (options); i++)
1530 int skip = extract_header_attr (au, options[i].name,
1531 options[i].variable);
1535 FREE_MAYBE (opaque);
1545 if (i == ARRAY_SIZE (options))
1547 while (*au && *au != '=')
1551 au += skip_lws (au);
1555 while (*au && *au != '\"')
1562 while (*au && *au != ',')
1567 if (!realm || !nonce || !user || !passwd || !path || !method)
1570 FREE_MAYBE (opaque);
1575 /* Calculate the digest value. */
1578 unsigned char hash[MD5_HASHLEN];
1579 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
1580 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
1582 /* A1BUF = H(user ":" realm ":" password) */
1583 md5_init_ctx (&ctx);
1584 md5_process_bytes (user, strlen (user), &ctx);
1585 md5_process_bytes (":", 1, &ctx);
1586 md5_process_bytes (realm, strlen (realm), &ctx);
1587 md5_process_bytes (":", 1, &ctx);
1588 md5_process_bytes (passwd, strlen (passwd), &ctx);
1589 md5_finish_ctx (&ctx, hash);
1590 dump_hash (a1buf, hash);
1592 /* A2BUF = H(method ":" path) */
1593 md5_init_ctx (&ctx);
1594 md5_process_bytes (method, strlen (method), &ctx);
1595 md5_process_bytes (":", 1, &ctx);
1596 md5_process_bytes (path, strlen (path), &ctx);
1597 md5_finish_ctx (&ctx, hash);
1598 dump_hash (a2buf, hash);
1600 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
1601 md5_init_ctx (&ctx);
1602 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
1603 md5_process_bytes (":", 1, &ctx);
1604 md5_process_bytes (nonce, strlen (nonce), &ctx);
1605 md5_process_bytes (":", 1, &ctx);
1606 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
1607 md5_finish_ctx (&ctx, hash);
1608 dump_hash (response_digest, hash);
1610 res = (char*) xmalloc (strlen (user)
1615 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
1616 + (opaque ? strlen (opaque) : 0)
1618 sprintf (res, "Authorization: Digest \
1619 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
1620 user, realm, nonce, path, response_digest);
1623 char *p = res + strlen (res);
1624 strcat (p, ", opaque=\"");
1628 strcat (res, "\r\n");
1632 #endif /* USE_DIGEST */
1635 #define HACK_O_MATIC(line, string_constant) \
1636 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1637 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1638 || !line[sizeof (string_constant) - 1]))
1641 known_authentication_scheme_p (const char *au)
1643 return HACK_O_MATIC (au, "Basic") || HACK_O_MATIC (au, "Digest");
1648 /* Create the HTTP authorization request header. When the
1649 `WWW-Authenticate' response header is seen, according to the
1650 authorization scheme specified in that header (`Basic' and `Digest'
1651 are supported by the current implementation), produce an
1652 appropriate HTTP authorization request header. */
1654 create_authorization_line (const char *au, const char *user,
1655 const char *passwd, const char *method,
1658 char *wwwauth = NULL;
1660 if (!strncasecmp (au, "Basic", 5))
1661 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
1663 else if (!strncasecmp (au, "Digest", 6))
1664 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
1665 #endif /* USE_DIGEST */