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 *result = xstrdup (hdr);
245 p = strrchr (hdr, ';');
249 *result = (char *)xmalloc (len + 1);
250 memcpy (*result, hdr, len);
251 (*result)[len] = '\0';
254 *result = xstrdup (hdr);
261 long len; /* received length */
262 long contlen; /* expected length */
263 long restval; /* the restart value */
264 int res; /* the result of last read */
265 char *newloc; /* new location (redirection) */
266 char *remote_time; /* remote time-stamp string */
267 char *error; /* textual HTTP error */
268 int statcode; /* status code */
269 long dltime; /* time of the download */
272 /* Free the elements of hstat X. */
273 #define FREEHSTAT(x) do \
275 FREE_MAYBE ((x).newloc); \
276 FREE_MAYBE ((x).remote_time); \
277 FREE_MAYBE ((x).error); \
278 (x).newloc = (x).remote_time = (x).error = NULL; \
281 static char *create_authorization_line PARAMS ((const char *, const char *,
282 const char *, const char *,
284 static char *basic_authentication_encode PARAMS ((const char *, const char *,
286 static int known_authentication_scheme_p PARAMS ((const char *));
288 static time_t http_atotm PARAMS ((char *));
290 /* Retrieve a document through HTTP protocol. It recognizes status
291 code, and correctly handles redirections. It closes the network
292 socket. If it receives an error from the functions below it, it
293 will print it if there is enough information to do so (almost
294 always), returning the error to the caller (i.e. http_loop).
296 Various HTTP parameters are stored to hs. Although it parses the
297 response code correctly, it is not used in a sane way. The caller
300 If u->proxy is non-NULL, the URL u will be taken as a proxy URL,
301 and u->proxy->url will be given to the proxy server (bad naming,
304 gethttp (struct urlinfo *u, struct http_stat *hs, int *dt)
306 char *request, *type, *command, *path, *qstring;
308 char *pragma_h, *referer, *useragent, *range, *wwwauth, *remhost;
309 char *authenticate_h;
314 int sock, hcount, num_written, all_length, remport, statcode;
315 long contlen, contrange;
319 int auth_tried_already;
322 /* Let the others worry about local filename... */
323 if (!(*dt & HEAD_ONLY))
324 assert (u->local != NULL);
327 auth_tried_already = 0;
330 /* We need to come back here when the initial attempt to retrieve
331 without authorization header fails. */
333 /* Initialize certain elements of struct hstat. */
338 hs->remote_time = NULL;
341 /* Which structure to use to retrieve the original URL data. */
347 /* First: establish the connection. */
348 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "), u->host, u->port);
349 err = make_connection (&sock, u->host, u->port);
353 logputs (LOG_VERBOSE, "\n");
354 logprintf (LOG_NOTQUIET, "%s: %s.\n", u->host, herrmsg (h_errno));
358 logputs (LOG_VERBOSE, "\n");
359 logprintf (LOG_NOTQUIET, "socket: %s\n", strerror (errno));
363 logputs (LOG_VERBOSE, "\n");
364 logprintf (LOG_NOTQUIET,
365 _("Connection to %s:%hu refused.\n"), u->host, u->port);
369 logputs (LOG_VERBOSE, "\n");
370 logprintf (LOG_NOTQUIET, "connect: %s\n", strerror (errno));
375 /* Everything is fine! */
376 logputs (LOG_VERBOSE, _("connected!\n"));
384 path = u->proxy->url;
388 qstring = u->qstring;
390 command = (*dt & HEAD_ONLY) ? "HEAD" : "GET";
394 referer = (char *)alloca (9 + strlen (ou->referer) + 3);
395 sprintf (referer, "Referer: %s\r\n", ou->referer);
397 if (*dt & SEND_NOCACHE)
398 pragma_h = "Pragma: no-cache\r\n";
403 range = (char *)alloca (13 + numdigit (hs->restval) + 4);
404 /* #### Gag me! Some servers (e.g. WebSitePro) have been known
405 to misinterpret the following `Range' format, and return the
406 document as multipart/x-byte-ranges MIME type!
408 #### TODO: Interpret MIME types, recognize bullshits similar
409 the one described above, and deal with them! */
410 sprintf (range, "Range: bytes=%ld-\r\n", hs->restval);
415 STRDUP_ALLOCA (useragent, opt.useragent);
418 useragent = (char *)alloca (10 + strlen (version_string));
419 sprintf (useragent, "Wget/%s", version_string);
421 /* Construct the authentication, if userid is present. */
424 search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0);
425 user = user ? user : opt.http_user;
426 passwd = passwd ? passwd : opt.http_passwd;
429 if (authenticate_h && user && passwd)
431 wwwauth = create_authorization_line (authenticate_h, user, passwd,
438 char *proxy_user, *proxy_passwd;
439 /* For normal username and password, URL components override
440 command-line/wgetrc parameters. With proxy authentication,
441 it's the reverse, because proxy URLs are normally the
442 "permanent" ones, so command-line args should take
444 if (opt.proxy_user && opt.proxy_passwd)
446 proxy_user = opt.proxy_user;
447 proxy_passwd = opt.proxy_passwd;
451 proxy_user = u->user;
452 proxy_passwd = u->passwd;
454 /* #### This is junky. Can't the proxy request, say, `Digest'
456 if (proxy_user && proxy_passwd)
457 proxyauth = basic_authentication_encode (proxy_user, proxy_passwd,
458 "Proxy-Authorization");
464 host_port = NULL; host_port_len = 0;
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)
473 + (qstring ? strlen (qstring) : 0)
475 + strlen (remhost) + host_port_len
476 + strlen (HTTP_ACCEPT)
477 + (referer ? strlen (referer) : 0)
478 + (wwwauth ? strlen (wwwauth) : 0)
479 + (proxyauth ? strlen (proxyauth) : 0)
480 + (range ? strlen (range) : 0)
482 + (opt.user_header ? strlen (opt.user_header) : 0)
484 /* Construct the request. */
486 %s %s%s HTTP/1.0\r\n\
491 command, path, qstring, useragent, remhost, 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 if (!first_retrieval && opt.wait)
965 /* Get the current time string. */
966 tms = time_str (NULL);
967 /* Print fetch message, if opt.verbose. */
970 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
974 sprintf (tmp, _("(try:%2d)"), count);
975 logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n",
976 tms, hurl, tmp, locf);
978 ws_changetitle (hurl, 1);
983 /* Default document type is empty. However, if spider mode is
984 on or time-stamping is employed, HEAD_ONLY commands is
985 encoded within *dt. */
986 if (opt.spider || (use_ts && !got_head))
990 /* Assume no restarting. */
992 /* Decide whether or not to restart. */
993 if (((count > 1 && (*dt & ACCEPTRANGES)) || opt.always_rest)
994 && file_exists_p (u->local))
995 if (stat (u->local, &st) == 0)
996 hstat.restval = st.st_size;
997 /* Decide whether to send the no-cache directive. */
998 if (u->proxy && (count > 1 || (opt.proxy_cache == 0)))
1001 *dt &= ~SEND_NOCACHE;
1003 /* Try fetching the document, or at least its head. :-) */
1004 err = gethttp (u, &hstat, dt);
1006 tms = time_str (NULL);
1007 /* Get the new location (with or without the redirection). */
1009 *newloc = xstrdup (hstat.newloc);
1012 case HERR: case HEOF: case CONSOCKERR: case CONCLOSED:
1013 case CONERROR: case READERR: case WRITEFAILED:
1015 /* Non-fatal errors continue executing the loop, which will
1016 bring them to "while" statement at the end, to judge
1017 whether the number of tries was exceeded. */
1019 printwhat (count, opt.ntry);
1022 case HOSTERR: case CONREFUSED: case PROXERR: case AUTHFAILED:
1023 /* Fatal errors just return from the function. */
1027 case FWRITEERR: case FOPENERR:
1028 /* Another fatal error. */
1029 logputs (LOG_VERBOSE, "\n");
1030 logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"),
1031 u->local, strerror (errno));
1036 /* Return the new location to the caller. */
1039 logprintf (LOG_NOTQUIET,
1040 _("ERROR: Redirection (%d) without location.\n"),
1048 /* Deal with you later. */
1051 /* All possibilities should have been exhausted. */
1054 if (!(*dt & RETROKF))
1058 /* #### Ugly ugly ugly! */
1059 char *hurl = str_url (u->proxy ? u->proxy : u, 1);
1060 logprintf (LOG_NONVERBOSE, "%s:\n", hurl);
1063 logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"),
1064 tms, hstat.statcode, hstat.error);
1065 logputs (LOG_VERBOSE, "\n");
1070 /* Did we get the time-stamp? */
1073 if (opt.timestamping && !hstat.remote_time)
1075 logputs (LOG_NOTQUIET, _("\
1076 Last-modified header missing -- time-stamps turned off.\n"));
1078 else if (hstat.remote_time)
1080 /* Convert the date-string into struct tm. */
1081 tmr = http_atotm (hstat.remote_time);
1082 if (tmr == (time_t) (-1))
1083 logputs (LOG_VERBOSE, _("\
1084 Last-modified header invalid -- time-stamp ignored.\n"));
1088 /* The time-stamping section. */
1093 use_ts = 0; /* no more time-stamping */
1094 count = 0; /* the retrieve count for HEAD is
1096 if (hstat.remote_time && tmr != (time_t) (-1))
1098 /* Now time-stamping can be used validly. Time-stamping
1099 means that if the sizes of the local and remote file
1100 match, and local file is newer than the remote file,
1101 it will not be retrieved. Otherwise, the normal
1102 download procedure is resumed. */
1104 (hstat.contlen == -1 || local_size == hstat.contlen))
1106 if (local_dot_orig_file_exists)
1107 /* We can't collapse this down into just one logprintf()
1108 call with a variable set to u->local or the .orig
1109 filename because we have to malloc() space for the
1110 latter, and because there are multiple returns above (a
1111 coding style no-no by many measures, for reasons such as
1112 this) we'd have to remember to free() the string at each
1113 one to avoid a memory leak. */
1114 logprintf (LOG_VERBOSE, _("\
1115 Server file no newer than local file `%s.orig' -- not retrieving.\n\n"),
1118 logprintf (LOG_VERBOSE, _("\
1119 Server file no newer than local file `%s' -- not retrieving.\n\n"), u->local);
1123 else if (tml >= tmr)
1124 logprintf (LOG_VERBOSE, _("\
1125 The sizes do not match (local %ld) -- retrieving.\n"), local_size);
1127 logputs (LOG_VERBOSE,
1128 _("Remote file is newer, retrieving.\n"));
1134 && (tmr != (time_t) (-1))
1136 && ((hstat.len == hstat.contlen) ||
1137 ((hstat.res == 0) &&
1138 ((hstat.contlen == -1) ||
1139 (hstat.len >= hstat.contlen && !opt.kill_longer)))))
1141 touch (u->local, tmr);
1143 /* End of time-stamping section. */
1147 logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, hstat.error);
1151 /* It is now safe to free the remainder of hstat, since the
1152 strings within it will no longer be used. */
1155 tmrate = rate (hstat.len - hstat.restval, hstat.dltime);
1157 if (hstat.len == hstat.contlen)
1161 logprintf (LOG_VERBOSE,
1162 _("%s (%s) - `%s' saved [%ld/%ld]\n\n"),
1163 tms, tmrate, locf, hstat.len, hstat.contlen);
1164 logprintf (LOG_NONVERBOSE,
1165 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1166 tms, u->url, hstat.len, hstat.contlen, locf, count);
1169 opt.downloaded += hstat.len;
1170 downloaded_file(ADD_FILE, locf);
1173 else if (hstat.res == 0) /* No read error */
1175 if (hstat.contlen == -1) /* We don't know how much we were supposed
1176 to get, so assume we succeeded. */
1180 logprintf (LOG_VERBOSE,
1181 _("%s (%s) - `%s' saved [%ld]\n\n"),
1182 tms, tmrate, locf, hstat.len);
1183 logprintf (LOG_NONVERBOSE,
1184 "%s URL:%s [%ld] -> \"%s\" [%d]\n",
1185 tms, u->url, hstat.len, locf, count);
1188 opt.downloaded += hstat.len;
1189 downloaded_file(ADD_FILE, locf);
1192 else if (hstat.len < hstat.contlen) /* meaning we lost the
1193 connection too soon */
1195 logprintf (LOG_VERBOSE,
1196 _("%s (%s) - Connection closed at byte %ld. "),
1197 tms, tmrate, hstat.len);
1198 printwhat (count, opt.ntry);
1201 else if (!opt.kill_longer) /* meaning we got more than expected */
1203 logprintf (LOG_VERBOSE,
1204 _("%s (%s) - `%s' saved [%ld/%ld])\n\n"),
1205 tms, tmrate, locf, hstat.len, hstat.contlen);
1206 logprintf (LOG_NONVERBOSE,
1207 "%s URL:%s [%ld/%ld] -> \"%s\" [%d]\n",
1208 tms, u->url, hstat.len, hstat.contlen, locf, count);
1210 opt.downloaded += hstat.len;
1211 downloaded_file(ADD_FILE, locf);
1214 else /* the same, but not accepted */
1216 logprintf (LOG_VERBOSE,
1217 _("%s (%s) - Connection closed at byte %ld/%ld. "),
1218 tms, tmrate, hstat.len, hstat.contlen);
1219 printwhat (count, opt.ntry);
1223 else /* now hstat.res can only be -1 */
1225 if (hstat.contlen == -1)
1227 logprintf (LOG_VERBOSE,
1228 _("%s (%s) - Read error at byte %ld (%s)."),
1229 tms, tmrate, hstat.len, strerror (errno));
1230 printwhat (count, opt.ntry);
1233 else /* hstat.res == -1 and contlen is given */
1235 logprintf (LOG_VERBOSE,
1236 _("%s (%s) - Read error at byte %ld/%ld (%s). "),
1237 tms, tmrate, hstat.len, hstat.contlen,
1239 printwhat (count, opt.ntry);
1246 while (!opt.ntry || (count < opt.ntry));
1250 /* Converts struct tm to time_t, assuming the data in tm is UTC rather
1251 than local timezone (mktime assumes the latter).
1253 Contributed by Roger Beeman <beeman@cisco.com>, with the help of
1254 Mark Baushke <mdb@cisco.com> and the rest of the Gurus at CISCO. */
1256 mktime_from_utc (struct tm *t)
1263 tb = mktime (gmtime (&tl));
1264 return (tl <= tb ? (tl + (tl - tb)) : (tl - (tb - tl)));
1267 /* Check whether the result of strptime() indicates success.
1268 strptime() returns the pointer to how far it got to in the string.
1269 The processing has been successful if the string is at `GMT' or
1270 `+X', or at the end of the string.
1272 In extended regexp parlance, the function returns 1 if P matches
1273 "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (a valid result of
1274 strptime()) is considered a failure and 0 is returned. */
1280 while (ISSPACE (*p))
1283 || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T')
1284 || ((p[0] == '+' || p[1] == '-') && ISDIGIT (p[1])))
1290 /* Convert TIME_STRING time to time_t. TIME_STRING can be in any of
1291 the three formats RFC2068 allows the HTTP servers to emit --
1292 RFC1123-date, RFC850-date or asctime-date. Timezones are ignored,
1295 We use strptime() to recognize various dates, which makes it a
1296 little bit slacker than the RFC1123/RFC850/asctime (e.g. it always
1297 allows shortened dates and months, one-digit days, etc.). It also
1298 allows more than one space anywhere where the specs require one SP.
1299 The routine should probably be even more forgiving (as recommended
1300 by RFC2068), but I do not have the time to write one.
1302 Return the computed time_t representation, or -1 if all the
1305 Needless to say, what we *really* need here is something like
1306 Marcus Hennecke's atotm(), which is forgiving, fast, to-the-point,
1307 and does not use strptime(). atotm() is to be found in the sources
1308 of `phttpd', a little-known HTTP server written by Peter Erikson. */
1310 http_atotm (char *time_string)
1314 /* Roger Beeman says: "This function dynamically allocates struct tm
1315 t, but does no initialization. The only field that actually
1316 needs initialization is tm_isdst, since the others will be set by
1317 strptime. Since strptime does not set tm_isdst, it will return
1318 the data structure with whatever data was in tm_isdst to begin
1319 with. For those of us in timezones where DST can occur, there
1320 can be a one hour shift depending on the previous contents of the
1321 data area where the data structure is allocated." */
1324 /* Note that under foreign locales Solaris strptime() fails to
1325 recognize English dates, which renders this function useless. I
1326 assume that other non-GNU strptime's are plagued by the same
1327 disease. We solve this by setting only LC_MESSAGES in
1328 i18n_initialize(), instead of LC_ALL.
1330 Another solution could be to temporarily set locale to C, invoke
1331 strptime(), and restore it back. This is slow and dirty,
1332 however, and locale support other than LC_MESSAGES can mess other
1333 things, so I rather chose to stick with just setting LC_MESSAGES.
1335 Also note that none of this is necessary under GNU strptime(),
1336 because it recognizes both international and local dates. */
1338 /* NOTE: We don't use `%n' for white space, as OSF's strptime uses
1339 it to eat all white space up to (and including) a newline, and
1340 the function fails if there is no newline (!).
1342 Let's hope all strptime() implementations use ` ' to skip *all*
1343 whitespace instead of just one (it works that way on all the
1344 systems I've tested it on). */
1346 /* RFC1123: Thu, 29 Jan 1998 22:12:57 */
1347 if (check_end (strptime (time_string, "%a, %d %b %Y %T", &t)))
1348 return mktime_from_utc (&t);
1349 /* RFC850: Thu, 29-Jan-98 22:12:57 */
1350 if (check_end (strptime (time_string, "%a, %d-%b-%y %T", &t)))
1351 return mktime_from_utc (&t);
1352 /* asctime: Thu Jan 29 22:12:57 1998 */
1353 if (check_end (strptime (time_string, "%a %b %d %T %Y", &t)))
1354 return mktime_from_utc (&t);
1359 /* Authorization support: We support two authorization schemes:
1361 * `Basic' scheme, consisting of base64-ing USER:PASSWORD string;
1363 * `Digest' scheme, added by Junio Hamano <junio@twinsun.com>,
1364 consisting of answering to the server's challenge with the proper
1367 /* How many bytes it will take to store LEN bytes in base64. */
1368 #define BASE64_LENGTH(len) (4 * (((len) + 2) / 3))
1370 /* Encode the string S of length LENGTH to base64 format and place it
1371 to STORE. STORE will be 0-terminated, and must point to a writable
1372 buffer of at least 1+BASE64_LENGTH(length) bytes. */
1374 base64_encode (const char *s, char *store, int length)
1376 /* Conversion table. */
1377 static char tbl[64] = {
1378 'A','B','C','D','E','F','G','H',
1379 'I','J','K','L','M','N','O','P',
1380 'Q','R','S','T','U','V','W','X',
1381 'Y','Z','a','b','c','d','e','f',
1382 'g','h','i','j','k','l','m','n',
1383 'o','p','q','r','s','t','u','v',
1384 'w','x','y','z','0','1','2','3',
1385 '4','5','6','7','8','9','+','/'
1388 unsigned char *p = (unsigned char *)store;
1390 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
1391 for (i = 0; i < length; i += 3)
1393 *p++ = tbl[s[0] >> 2];
1394 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
1395 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
1396 *p++ = tbl[s[2] & 0x3f];
1399 /* Pad the result if necessary... */
1400 if (i == length + 1)
1402 else if (i == length + 2)
1403 *(p - 1) = *(p - 2) = '=';
1404 /* ...and zero-terminate it. */
1408 /* Create the authentication header contents for the `Basic' scheme.
1409 This is done by encoding the string `USER:PASS' in base64 and
1410 prepending `HEADER: Basic ' to it. */
1412 basic_authentication_encode (const char *user, const char *passwd,
1415 char *t1, *t2, *res;
1416 int len1 = strlen (user) + 1 + strlen (passwd);
1417 int len2 = BASE64_LENGTH (len1);
1419 t1 = (char *)alloca (len1 + 1);
1420 sprintf (t1, "%s:%s", user, passwd);
1421 t2 = (char *)alloca (1 + len2);
1422 base64_encode (t1, t2, len1);
1423 res = (char *)malloc (len2 + 11 + strlen (header));
1424 sprintf (res, "%s: Basic %s\r\n", header, t2);
1430 /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning
1431 of a field in such a header. If the field is the one specified by
1432 ATTR_NAME ("realm", "opaque", and "nonce" are used by the current
1433 digest authorization code), extract its value in the (char*)
1434 variable pointed by RET. Returns negative on a malformed header,
1435 or number of bytes that have been parsed by this call. */
1437 extract_header_attr (const char *au, const char *attr_name, char **ret)
1439 const char *cp, *ep;
1443 if (strncmp (cp, attr_name, strlen (attr_name)) == 0)
1445 cp += strlen (attr_name);
1448 cp += skip_lws (cp);
1453 cp += skip_lws (cp);
1458 for (ep = cp; *ep && *ep != '\"'; ep++)
1463 *ret = strdupdelim (cp, ep);
1470 /* Response value needs to be in lowercase, so we cannot use HEXD2ASC
1471 from url.h. See RFC 2069 2.1.2 for the syntax of response-digest. */
1472 #define HEXD2asc(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
1474 /* Dump the hexadecimal representation of HASH to BUF. HASH should be
1475 an array of 16 bytes containing the hash keys, and BUF should be a
1476 buffer of 33 writable characters (32 for hex digits plus one for
1477 zero termination). */
1479 dump_hash (unsigned char *buf, const unsigned char *hash)
1483 for (i = 0; i < MD5_HASHLEN; i++, hash++)
1485 *buf++ = HEXD2asc (*hash >> 4);
1486 *buf++ = HEXD2asc (*hash & 0xf);
1491 /* Take the line apart to find the challenge, and compose a digest
1492 authorization header. See RFC2069 section 2.1.2. */
1494 digest_authentication_encode (const char *au, const char *user,
1495 const char *passwd, const char *method,
1498 static char *realm, *opaque, *nonce;
1503 { "realm", &realm },
1504 { "opaque", &opaque },
1509 realm = opaque = nonce = NULL;
1511 au += 6; /* skip over `Digest' */
1516 au += skip_lws (au);
1517 for (i = 0; i < ARRAY_SIZE (options); i++)
1519 int skip = extract_header_attr (au, options[i].name,
1520 options[i].variable);
1524 FREE_MAYBE (opaque);
1534 if (i == ARRAY_SIZE (options))
1536 while (*au && *au != '=')
1540 au += skip_lws (au);
1544 while (*au && *au != '\"')
1551 while (*au && *au != ',')
1556 if (!realm || !nonce || !user || !passwd || !path || !method)
1559 FREE_MAYBE (opaque);
1564 /* Calculate the digest value. */
1567 unsigned char hash[MD5_HASHLEN];
1568 unsigned char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1];
1569 unsigned char response_digest[MD5_HASHLEN * 2 + 1];
1571 /* A1BUF = H(user ":" realm ":" password) */
1572 md5_init_ctx (&ctx);
1573 md5_process_bytes (user, strlen (user), &ctx);
1574 md5_process_bytes (":", 1, &ctx);
1575 md5_process_bytes (realm, strlen (realm), &ctx);
1576 md5_process_bytes (":", 1, &ctx);
1577 md5_process_bytes (passwd, strlen (passwd), &ctx);
1578 md5_finish_ctx (&ctx, hash);
1579 dump_hash (a1buf, hash);
1581 /* A2BUF = H(method ":" path) */
1582 md5_init_ctx (&ctx);
1583 md5_process_bytes (method, strlen (method), &ctx);
1584 md5_process_bytes (":", 1, &ctx);
1585 md5_process_bytes (path, strlen (path), &ctx);
1586 md5_finish_ctx (&ctx, hash);
1587 dump_hash (a2buf, hash);
1589 /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */
1590 md5_init_ctx (&ctx);
1591 md5_process_bytes (a1buf, MD5_HASHLEN * 2, &ctx);
1592 md5_process_bytes (":", 1, &ctx);
1593 md5_process_bytes (nonce, strlen (nonce), &ctx);
1594 md5_process_bytes (":", 1, &ctx);
1595 md5_process_bytes (a2buf, MD5_HASHLEN * 2, &ctx);
1596 md5_finish_ctx (&ctx, hash);
1597 dump_hash (response_digest, hash);
1599 res = (char*) xmalloc (strlen (user)
1604 + 2 * MD5_HASHLEN /*strlen (response_digest)*/
1605 + (opaque ? strlen (opaque) : 0)
1607 sprintf (res, "Authorization: Digest \
1608 username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
1609 user, realm, nonce, path, response_digest);
1612 char *p = res + strlen (res);
1613 strcat (p, ", opaque=\"");
1617 strcat (res, "\r\n");
1621 #endif /* USE_DIGEST */
1624 #define HACK_O_MATIC(line, string_constant) \
1625 (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \
1626 && (ISSPACE (line[sizeof (string_constant) - 1]) \
1627 || !line[sizeof (string_constant) - 1]))
1630 known_authentication_scheme_p (const char *au)
1632 return HACK_O_MATIC (au, "Basic") || HACK_O_MATIC (au, "Digest");
1637 /* Create the HTTP authorization request header. When the
1638 `WWW-Authenticate' response header is seen, according to the
1639 authorization scheme specified in that header (`Basic' and `Digest'
1640 are supported by the current implementation), produce an
1641 appropriate HTTP authorization request header. */
1643 create_authorization_line (const char *au, const char *user,
1644 const char *passwd, const char *method,
1647 char *wwwauth = NULL;
1649 if (!strncasecmp (au, "Basic", 5))
1650 wwwauth = basic_authentication_encode (user, passwd, "Authorization");
1652 else if (!strncasecmp (au, "Digest", 6))
1653 wwwauth = digest_authentication_encode (au, user, passwd, method, path);
1654 #endif /* USE_DIGEST */