2 Copyright (C) 2005 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 (at
9 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. */
39 #include <sys/types.h>
49 #include "host.h" /* for is_valid_ipv6_address */
58 const char *leading_string;
63 /* Supported schemes: */
64 static struct scheme_data supported_schemes[] =
66 { "http", "http://", DEFAULT_HTTP_PORT, 1 },
68 { "https", "https://", DEFAULT_HTTPS_PORT, 1 },
70 { "ftp", "ftp://", DEFAULT_FTP_PORT, 1 },
76 /* Forward declarations: */
78 static int path_simplify PARAMS ((char *));
80 /* Support for escaping and unescaping of URL strings. */
82 /* Table of "reserved" and "unsafe" characters. Those terms are
83 rfc1738-speak, as such largely obsoleted by rfc2396 and later
84 specs, but the general idea remains.
86 A reserved character is the one that you can't decode without
87 changing the meaning of the URL. For example, you can't decode
88 "/foo/%2f/bar" into "/foo///bar" because the number and contents of
89 path components is different. Non-reserved characters can be
90 changed, so "/foo/%78/bar" is safe to change to "/foo/x/bar". The
91 unsafe characters are loosely based on rfc1738, plus "$" and ",",
92 as recommended by rfc2396, and minus "~", which is very frequently
93 used (and sometimes unrecognized as %7E by broken servers).
95 An unsafe character is the one that should be encoded when URLs are
96 placed in foreign environments. E.g. space and newline are unsafe
97 in HTTP contexts because HTTP uses them as separator and line
98 terminator, so they must be encoded to %20 and %0A respectively.
99 "*" is unsafe in shell context, etc.
101 We determine whether a character is unsafe through static table
102 lookup. This code assumes ASCII character set and 8-bit chars. */
105 /* rfc1738 reserved chars + "$" and ",". */
108 /* rfc1738 unsafe chars, plus non-printables. */
112 #define urlchr_test(c, mask) (urlchr_table[(unsigned char)(c)] & (mask))
113 #define URL_RESERVED_CHAR(c) urlchr_test(c, urlchr_reserved)
114 #define URL_UNSAFE_CHAR(c) urlchr_test(c, urlchr_unsafe)
116 /* Shorthands for the table: */
117 #define R urlchr_reserved
118 #define U urlchr_unsafe
121 static const unsigned char urlchr_table[256] =
123 U, U, U, U, U, U, U, U, /* NUL SOH STX ETX EOT ENQ ACK BEL */
124 U, U, U, U, U, U, U, U, /* BS HT LF VT FF CR SO SI */
125 U, U, U, U, U, U, U, U, /* DLE DC1 DC2 DC3 DC4 NAK SYN ETB */
126 U, U, U, U, U, U, U, U, /* CAN EM SUB ESC FS GS RS US */
127 U, 0, U, RU, R, U, R, 0, /* SP ! " # $ % & ' */
128 0, 0, 0, R, R, 0, 0, R, /* ( ) * + , - . / */
129 0, 0, 0, 0, 0, 0, 0, 0, /* 0 1 2 3 4 5 6 7 */
130 0, 0, RU, R, U, R, U, R, /* 8 9 : ; < = > ? */
131 RU, 0, 0, 0, 0, 0, 0, 0, /* @ A B C D E F G */
132 0, 0, 0, 0, 0, 0, 0, 0, /* H I J K L M N O */
133 0, 0, 0, 0, 0, 0, 0, 0, /* P Q R S T U V W */
134 0, 0, 0, RU, U, RU, U, 0, /* X Y Z [ \ ] ^ _ */
135 U, 0, 0, 0, 0, 0, 0, 0, /* ` a b c d e f g */
136 0, 0, 0, 0, 0, 0, 0, 0, /* h i j k l m n o */
137 0, 0, 0, 0, 0, 0, 0, 0, /* p q r s t u v w */
138 0, 0, 0, U, U, U, 0, U, /* x y z { | } ~ DEL */
140 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
141 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
142 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
143 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
145 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
146 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
147 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
148 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
154 /* URL-unescape the string S.
156 This is done by transforming the sequences "%HH" to the character
157 represented by the hexadecimal digits HH. If % is not followed by
158 two hexadecimal digits, it is inserted literally.
160 The transformation is done in place. If you need the original
161 string intact, make a copy before calling this function. */
164 url_unescape (char *s)
166 char *t = s; /* t - tortoise */
167 char *h = s; /* h - hare */
179 /* Do nothing if '%' is not followed by two hex digits. */
180 if (!h[1] || !h[2] || !(ISXDIGIT (h[1]) && ISXDIGIT (h[2])))
182 c = X2DIGITS_TO_NUM (h[1], h[2]);
183 /* Don't unescape %00 because there is no way to insert it
184 into a C string without effectively truncating it. */
194 /* The core of url_escape_* functions. Escapes the characters that
195 match the provided mask in urlchr_table.
197 If ALLOW_PASSTHROUGH is non-zero, a string with no unsafe chars
198 will be returned unchanged. If ALLOW_PASSTHROUGH is zero, a
199 freshly allocated string will be returned in all cases. */
202 url_escape_1 (const char *s, unsigned char mask, int allow_passthrough)
209 for (p1 = s; *p1; p1++)
210 if (urlchr_test (*p1, mask))
211 addition += 2; /* Two more characters (hex digits) */
214 return allow_passthrough ? (char *)s : xstrdup (s);
216 newlen = (p1 - s) + addition;
217 newstr = (char *)xmalloc (newlen + 1);
223 /* Quote the characters that match the test mask. */
224 if (urlchr_test (*p1, mask))
226 unsigned char c = *p1++;
228 *p2++ = XNUM_TO_DIGIT (c >> 4);
229 *p2++ = XNUM_TO_DIGIT (c & 0xf);
234 assert (p2 - newstr == newlen);
240 /* URL-escape the unsafe characters (see urlchr_table) in a given
241 string, returning a freshly allocated string. */
244 url_escape (const char *s)
246 return url_escape_1 (s, urlchr_unsafe, 0);
249 /* URL-escape the unsafe characters (see urlchr_table) in a given
250 string. If no characters are unsafe, S is returned. */
253 url_escape_allow_passthrough (const char *s)
255 return url_escape_1 (s, urlchr_unsafe, 1);
258 /* Decide whether the char at position P needs to be encoded. (It is
259 not enough to pass a single char *P because the function may need
260 to inspect the surrounding context.)
262 Return 1 if the char should be escaped as %XX, 0 otherwise. */
265 char_needs_escaping (const char *p)
269 if (ISXDIGIT (*(p + 1)) && ISXDIGIT (*(p + 2)))
272 /* Garbled %.. sequence: encode `%'. */
275 else if (URL_UNSAFE_CHAR (*p) && !URL_RESERVED_CHAR (*p))
281 /* Translate a %-escaped (but possibly non-conformant) input string S
282 into a %-escaped (and conformant) output string. If no characters
283 are encoded or decoded, return the same string S; otherwise, return
284 a freshly allocated string with the new contents.
286 After a URL has been run through this function, the protocols that
287 use `%' as the quote character can use the resulting string as-is,
288 while those that don't can use url_unescape to get to the intended
289 data. This function is stable: once the input is transformed,
290 further transformations of the result yield the same output.
292 Let's discuss why this function is needed.
294 Imagine Wget is asked to retrieve `http://abc.xyz/abc def'. Since
295 a raw space character would mess up the HTTP request, it needs to
296 be quoted, like this:
298 GET /abc%20def HTTP/1.0
300 It would appear that the unsafe chars need to be quoted, for
301 example with url_escape. But what if we're requested to download
302 `abc%20def'? url_escape transforms "%" to "%25", which would leave
303 us with `abc%2520def'. This is incorrect -- since %-escapes are
304 part of URL syntax, "%20" is the correct way to denote a literal
305 space on the Wget command line. This leads to the conclusion that
306 in that case Wget should not call url_escape, but leave the `%20'
307 as is. This is clearly contradictory, but it only gets worse.
309 What if the requested URI is `abc%20 def'? If we call url_escape,
310 we end up with `/abc%2520%20def', which is almost certainly not
311 intended. If we don't call url_escape, we are left with the
312 embedded space and cannot complete the request. What the user
313 meant was for Wget to request `/abc%20%20def', and this is where
314 reencode_escapes kicks in.
316 Wget used to solve this by first decoding %-quotes, and then
317 encoding all the "unsafe" characters found in the resulting string.
318 This was wrong because it didn't preserve certain URL special
319 (reserved) characters. For instance, URI containing "a%2B+b" (0x2b
320 == '+') would get translated to "a%2B%2Bb" or "a++b" depending on
321 whether we considered `+' reserved (it is). One of these results
322 is inevitable because by the second step we would lose information
323 on whether the `+' was originally encoded or not. Both results
324 were wrong because in CGI parameters + means space, while %2B means
325 literal plus. reencode_escapes correctly translates the above to
326 "a%2B+b", i.e. returns the original string.
328 This function uses a modified version of the algorithm originally
329 proposed by Anon Sricharoenchai:
331 * Encode all "unsafe" characters, except those that are also
332 "reserved", to %XX. See urlchr_table for which characters are
335 * Encode the "%" characters not followed by two hex digits to
338 * Pass through all other characters and %XX escapes as-is. (Up to
339 Wget 1.10 this decoded %XX escapes corresponding to "safe"
340 characters, but that was obtrusive and broke some servers.)
344 "http://abc.xyz/%20%3F%%36%31%25aa% a?a=%61+a%2Ba&b=b%26c%3Dc"
346 "http://abc.xyz/%20%3F%25%36%31%25aa%25%20a?a=%61+a%2Ba&b=b%26c%3Dc"
350 "foo bar" -> "foo%20bar"
351 "foo%20bar" -> "foo%20bar"
352 "foo %20bar" -> "foo%20%20bar"
353 "foo%%20bar" -> "foo%25%20bar" (0x25 == '%')
354 "foo%25%20bar" -> "foo%25%20bar"
355 "foo%2%20bar" -> "foo%252%20bar"
356 "foo+bar" -> "foo+bar" (plus is reserved!)
357 "foo%2b+bar" -> "foo%2b+bar" */
360 reencode_escapes (const char *s)
366 int encode_count = 0;
368 /* First pass: inspect the string to see if there's anything to do,
369 and to calculate the new length. */
370 for (p1 = s; *p1; p1++)
371 if (char_needs_escaping (p1))
375 /* The string is good as it is. */
376 return (char *) s; /* C const model sucks. */
379 /* Each encoding adds two characters (hex digits). */
380 newlen = oldlen + 2 * encode_count;
381 newstr = xmalloc (newlen + 1);
383 /* Second pass: copy the string to the destination address, encoding
384 chars when needed. */
389 if (char_needs_escaping (p1))
391 unsigned char c = *p1++;
393 *p2++ = XNUM_TO_DIGIT (c >> 4);
394 *p2++ = XNUM_TO_DIGIT (c & 0xf);
400 assert (p2 - newstr == newlen);
404 /* Returns the scheme type if the scheme is supported, or
405 SCHEME_INVALID if not. */
408 url_scheme (const char *url)
412 for (i = 0; supported_schemes[i].leading_string; i++)
413 if (0 == strncasecmp (url, supported_schemes[i].leading_string,
414 strlen (supported_schemes[i].leading_string)))
416 if (supported_schemes[i].enabled)
417 return (enum url_scheme) i;
419 return SCHEME_INVALID;
422 return SCHEME_INVALID;
425 #define SCHEME_CHAR(ch) (ISALNUM (ch) || (ch) == '-' || (ch) == '+')
427 /* Return 1 if the URL begins with any "scheme", 0 otherwise. As
428 currently implemented, it returns true if URL begins with
432 url_has_scheme (const char *url)
436 /* The first char must be a scheme char. */
437 if (!*p || !SCHEME_CHAR (*p))
440 /* Followed by 0 or more scheme chars. */
441 while (*p && SCHEME_CHAR (*p))
443 /* Terminated by ':'. */
448 scheme_default_port (enum url_scheme scheme)
450 return supported_schemes[scheme].default_port;
454 scheme_disable (enum url_scheme scheme)
456 supported_schemes[scheme].enabled = 0;
459 /* Skip the username and password, if present in the URL. The
460 function should *not* be called with the complete URL, but with the
461 portion after the scheme.
463 If no username and password are found, return URL. */
466 url_skip_credentials (const char *url)
468 /* Look for '@' that comes before terminators, such as '/', '?',
470 const char *p = (const char *)strpbrk (url, "@/?#;");
476 /* Parse credentials contained in [BEG, END). The region is expected
477 to have come from a URL and is unescaped. */
480 parse_credentials (const char *beg, const char *end, char **user, char **passwd)
486 return 0; /* empty user name */
488 colon = memchr (beg, ':', end - beg);
490 return 0; /* again empty user name */
494 *passwd = strdupdelim (colon + 1, end);
496 url_unescape (*passwd);
503 *user = strdupdelim (beg, userend);
504 url_unescape (*user);
508 /* Used by main.c: detect URLs written using the "shorthand" URL forms
509 popularized by Netscape and NcFTP. HTTP shorthands look like this:
511 www.foo.com[:port]/dir/file -> http://www.foo.com[:port]/dir/file
512 www.foo.com[:port] -> http://www.foo.com[:port]
514 FTP shorthands look like this:
516 foo.bar.com:dir/file -> ftp://foo.bar.com/dir/file
517 foo.bar.com:/absdir/file -> ftp://foo.bar.com//absdir/file
519 If the URL needs not or cannot be rewritten, return NULL. */
522 rewrite_shorthand_url (const char *url)
526 if (url_scheme (url) != SCHEME_INVALID)
529 /* Look for a ':' or '/'. The former signifies NcFTP syntax, the
531 for (p = url; *p && *p != ':' && *p != '/'; p++)
537 /* If we're looking at "://", it means the URL uses a scheme we
538 don't support, which may include "https" when compiled without
539 SSL support. Don't bogusly rewrite such URLs. */
540 if (p[0] == ':' && p[1] == '/' && p[2] == '/')
547 /* If the characters after the colon and before the next slash
548 or end of string are all digits, it's HTTP. */
550 for (pp = p + 1; ISDIGIT (*pp); pp++)
552 if (digits > 0 && (*pp == '/' || *pp == '\0'))
555 /* Prepend "ftp://" to the entire URL... */
556 res = xmalloc (6 + strlen (url) + 1);
557 sprintf (res, "ftp://%s", url);
558 /* ...and replace ':' with '/'. */
559 res[6 + (p - url)] = '/';
566 /* Just prepend "http://" to what we have. */
567 res = xmalloc (7 + strlen (url) + 1);
568 sprintf (res, "http://%s", url);
573 static void split_path PARAMS ((const char *, char **, char **));
575 /* Like strpbrk, with the exception that it returns the pointer to the
576 terminating zero (end-of-string aka "eos") if no matching character
579 Although I normally balk at Gcc-specific optimizations, it probably
580 makes sense here: glibc has optimizations that detect strpbrk being
581 called with literal string as ACCEPT and inline the search. That
582 optimization is defeated if strpbrk is hidden within the call to
583 another function. (And no, making strpbrk_or_eos inline doesn't
584 help because the check for literal accept is in the
589 #define strpbrk_or_eos(s, accept) ({ \
590 char *SOE_p = strpbrk (s, accept); \
592 SOE_p = strchr (s, '\0'); \
596 #else /* not __GNUC__ */
599 strpbrk_or_eos (const char *s, const char *accept)
601 char *p = strpbrk (s, accept);
603 p = strchr (s, '\0');
606 #endif /* not __GNUC__ */
608 /* Turn STR into lowercase; return non-zero if a character was
612 lowercase_str (char *str)
619 *str = TOLOWER (*str);
624 static const char *parse_errors[] = {
625 #define PE_NO_ERROR 0
627 #define PE_UNSUPPORTED_SCHEME 1
628 N_("Unsupported scheme"),
629 #define PE_EMPTY_HOST 2
631 #define PE_BAD_PORT_NUMBER 3
632 N_("Bad port number"),
633 #define PE_INVALID_USER_NAME 4
634 N_("Invalid user name"),
635 #define PE_UNTERMINATED_IPV6_ADDRESS 5
636 N_("Unterminated IPv6 numeric address"),
637 #define PE_IPV6_NOT_SUPPORTED 6
638 N_("IPv6 addresses not supported"),
639 #define PE_INVALID_IPV6_ADDRESS 7
640 N_("Invalid IPv6 numeric address")
645 Return a new struct url if successful, NULL on error. In case of
646 error, and if ERROR is not NULL, also set *ERROR to the appropriate
649 url_parse (const char *url, int *error)
653 int path_modified, host_modified;
655 enum url_scheme scheme;
657 const char *uname_b, *uname_e;
658 const char *host_b, *host_e;
659 const char *path_b, *path_e;
660 const char *params_b, *params_e;
661 const char *query_b, *query_e;
662 const char *fragment_b, *fragment_e;
665 char *user = NULL, *passwd = NULL;
667 char *url_encoded = NULL;
671 scheme = url_scheme (url);
672 if (scheme == SCHEME_INVALID)
674 error_code = PE_UNSUPPORTED_SCHEME;
678 url_encoded = reencode_escapes (url);
681 p += strlen (supported_schemes[scheme].leading_string);
683 p = url_skip_credentials (p);
686 /* scheme://user:pass@host[:port]... */
689 /* We attempt to break down the URL into the components path,
690 params, query, and fragment. They are ordered like this:
692 scheme://host[:port][/path][;params][?query][#fragment] */
694 params_b = params_e = NULL;
695 query_b = query_e = NULL;
696 fragment_b = fragment_e = NULL;
702 /* Handle IPv6 address inside square brackets. Ideally we'd
703 just look for the terminating ']', but rfc2732 mandates
704 rejecting invalid IPv6 addresses. */
706 /* The address begins after '['. */
708 host_e = strchr (host_b, ']');
712 error_code = PE_UNTERMINATED_IPV6_ADDRESS;
717 /* Check if the IPv6 address is valid. */
718 if (!is_valid_ipv6_address(host_b, host_e))
720 error_code = PE_INVALID_IPV6_ADDRESS;
724 /* Continue parsing after the closing ']'. */
727 error_code = PE_IPV6_NOT_SUPPORTED;
733 p = strpbrk_or_eos (p, ":/;?#");
737 if (host_b == host_e)
739 error_code = PE_EMPTY_HOST;
743 port = scheme_default_port (scheme);
746 const char *port_b, *port_e, *pp;
748 /* scheme://host:port/tralala */
752 p = strpbrk_or_eos (p, "/;?#");
755 /* Allow empty port, as per rfc2396. */
756 if (port_b != port_e)
758 for (port = 0, pp = port_b; pp < port_e; pp++)
762 /* http://host:12randomgarbage/blah */
764 error_code = PE_BAD_PORT_NUMBER;
767 port = 10 * port + (*pp - '0');
768 /* Check for too large port numbers here, before we have
769 a chance to overflow on bogus port values. */
772 error_code = PE_BAD_PORT_NUMBER;
783 p = strpbrk_or_eos (p, ";?#");
788 /* Path is not allowed not to exist. */
796 p = strpbrk_or_eos (p, "?#");
803 p = strpbrk_or_eos (p, "#");
806 /* Hack that allows users to use '?' (a wildcard character) in
807 FTP URLs without it being interpreted as a query string
809 if (scheme == SCHEME_FTP)
811 query_b = query_e = NULL;
824 if (uname_b != uname_e)
826 /* http://user:pass@host */
828 /* uname_b uname_e */
829 if (!parse_credentials (uname_b, uname_e - 1, &user, &passwd))
831 error_code = PE_INVALID_USER_NAME;
836 u = xnew0 (struct url);
838 u->host = strdupdelim (host_b, host_e);
843 u->path = strdupdelim (path_b, path_e);
844 path_modified = path_simplify (u->path);
845 split_path (u->path, &u->dir, &u->file);
847 host_modified = lowercase_str (u->host);
849 /* Decode %HH sequences in host name. This is important not so much
850 to support %HH sequences in host names (which other browser
851 don't), but to support binary characters (which will have been
852 converted to %HH by reencode_escapes). */
853 if (strchr (u->host, '%'))
855 url_unescape (u->host);
860 u->params = strdupdelim (params_b, params_e);
862 u->query = strdupdelim (query_b, query_e);
864 u->fragment = strdupdelim (fragment_b, fragment_e);
866 if (path_modified || u->fragment || host_modified || path_b == path_e)
868 /* If we suspect that a transformation has rendered what
869 url_string might return different from URL_ENCODED, rebuild
870 u->url using url_string. */
871 u->url = url_string (u, 0);
873 if (url_encoded != url)
874 xfree ((char *) url_encoded);
878 if (url_encoded == url)
879 u->url = xstrdup (url);
881 u->url = url_encoded;
887 /* Cleanup in case of error: */
888 if (url_encoded && url_encoded != url)
891 /* Transmit the error code to the caller, if the caller wants to
898 /* Return the error message string from ERROR_CODE, which should have
899 been retrieved from url_parse. The error message is translated. */
902 url_error (int error_code)
904 assert (error_code >= 0 && error_code < countof (parse_errors));
905 return _(parse_errors[error_code]);
908 /* Split PATH into DIR and FILE. PATH comes from the URL and is
909 expected to be URL-escaped.
911 The path is split into directory (the part up to the last slash)
912 and file (the part after the last slash), which are subsequently
916 "foo/bar/baz" "foo/bar" "baz"
917 "foo/bar/" "foo/bar" ""
919 "foo/bar/baz%2fqux" "foo/bar" "baz/qux" (!)
921 DIR and FILE are freshly allocated. */
924 split_path (const char *path, char **dir, char **file)
926 char *last_slash = strrchr (path, '/');
930 *file = xstrdup (path);
934 *dir = strdupdelim (path, last_slash);
935 *file = xstrdup (last_slash + 1);
938 url_unescape (*file);
941 /* Note: URL's "full path" is the path with the query string and
942 params appended. The "fragment" (#foo) is intentionally ignored,
943 but that might be changed. For example, if the original URL was
944 "http://host:port/foo/bar/baz;bullshit?querystring#uselessfragment",
945 the full path will be "/foo/bar/baz;bullshit?querystring". */
947 /* Return the length of the full path, without the terminating
951 full_path_length (const struct url *url)
955 #define FROB(el) if (url->el) len += 1 + strlen (url->el)
966 /* Write out the full path. */
969 full_path_write (const struct url *url, char *where)
971 #define FROB(el, chr) do { \
972 char *f_el = url->el; \
974 int l = strlen (f_el); \
976 memcpy (where, f_el, l); \
988 /* Public function for getting the "full path". E.g. if u->path is
989 "foo/bar" and u->query is "param=value", full_path will be
990 "/foo/bar?param=value". */
993 url_full_path (const struct url *url)
995 int length = full_path_length (url);
996 char *full_path = (char *) xmalloc (length + 1);
998 full_path_write (url, full_path);
999 full_path[length] = '\0';
1004 /* Unescape CHR in an otherwise escaped STR. Used to selectively
1005 escaping of certain characters, such as "/" and ":". Returns a
1006 count of unescaped chars. */
1009 unescape_single_char (char *str, char chr)
1011 const char c1 = XNUM_TO_DIGIT (chr >> 4);
1012 const char c2 = XNUM_TO_DIGIT (chr & 0xf);
1013 char *h = str; /* hare */
1014 char *t = str; /* tortoise */
1015 for (; *h; h++, t++)
1017 if (h[0] == '%' && h[1] == c1 && h[2] == c2)
1028 /* Escape unsafe and reserved characters, except for the slash
1032 url_escape_dir (const char *dir)
1034 char *newdir = url_escape_1 (dir, urlchr_unsafe | urlchr_reserved, 1);
1038 unescape_single_char (newdir, '/');
1042 /* Sync u->path and u->url with u->dir and u->file. Called after
1043 u->file or u->dir have been changed, typically by the FTP code. */
1046 sync_path (struct url *u)
1048 char *newpath, *efile, *edir;
1052 /* u->dir and u->file are not escaped. URL-escape them before
1053 reassembling them into u->path. That way, if they contain
1054 separators like '?' or even if u->file contains slashes, the
1055 path will be correctly assembled. (u->file can contain slashes
1056 if the URL specifies it with %2f, or if an FTP server returns
1058 edir = url_escape_dir (u->dir);
1059 efile = url_escape_1 (u->file, urlchr_unsafe | urlchr_reserved, 1);
1062 newpath = xstrdup (efile);
1065 int dirlen = strlen (edir);
1066 int filelen = strlen (efile);
1068 /* Copy "DIR/FILE" to newpath. */
1069 char *p = newpath = xmalloc (dirlen + 1 + filelen + 1);
1070 memcpy (p, edir, dirlen);
1073 memcpy (p, efile, filelen);
1082 if (efile != u->file)
1085 /* Regenerate u->url as well. */
1087 u->url = url_string (u, 0);
1090 /* Mutators. Code in ftp.c insists on changing u->dir and u->file.
1091 This way we can sync u->path and u->url when they get changed. */
1094 url_set_dir (struct url *url, const char *newdir)
1097 url->dir = xstrdup (newdir);
1102 url_set_file (struct url *url, const char *newfile)
1105 url->file = xstrdup (newfile);
1110 url_free (struct url *url)
1116 xfree_null (url->params);
1117 xfree_null (url->query);
1118 xfree_null (url->fragment);
1119 xfree_null (url->user);
1120 xfree_null (url->passwd);
1128 /* Create all the necessary directories for PATH (a file). Calls
1129 mkdirhier() internally. */
1131 mkalldirs (const char *path)
1138 p = path + strlen (path);
1139 for (; *p != '/' && p != path; p--)
1142 /* Don't create if it's just a file. */
1143 if ((p == path) && (*p != '/'))
1145 t = strdupdelim (path, p);
1147 /* Check whether the directory exists. */
1148 if ((stat (t, &st) == 0))
1150 if (S_ISDIR (st.st_mode))
1157 /* If the dir exists as a file name, remove it first. This
1158 is *only* for Wget to work with buggy old CERN http
1159 servers. Here is the scenario: When Wget tries to
1160 retrieve a directory without a slash, e.g.
1161 http://foo/bar (bar being a directory), CERN server will
1162 not redirect it too http://foo/bar/ -- it will generate a
1163 directory listing containing links to bar/file1,
1164 bar/file2, etc. Wget will lose because it saves this
1165 HTML listing to a file `bar', so it cannot create the
1166 directory. To work around this, if the file of the same
1167 name exists, we just remove it and create the directory
1169 DEBUGP (("Removing %s because of directory danger!\n", t));
1173 res = make_directory (t);
1175 logprintf (LOG_NOTQUIET, "%s: %s", t, strerror (errno));
1180 /* Functions for constructing the file name out of URL components. */
1182 /* A growable string structure, used by url_file_name and friends.
1183 This should perhaps be moved to utils.c.
1185 The idea is to have a convenient and efficient way to construct a
1186 string by having various functions append data to it. Instead of
1187 passing the obligatory BASEVAR, SIZEVAR and TAILPOS to all the
1188 functions in questions, we pass the pointer to this struct. */
1196 /* Ensure that the string can accept APPEND_COUNT more characters past
1197 the current TAIL position. If necessary, this will grow the string
1198 and update its allocated size. If the string is already large
1199 enough to take TAIL+APPEND_COUNT characters, this does nothing. */
1200 #define GROW(g, append_size) do { \
1201 struct growable *G_ = g; \
1202 DO_REALLOC (G_->base, G_->size, G_->tail + append_size, char); \
1205 /* Return the tail position of the string. */
1206 #define TAIL(r) ((r)->base + (r)->tail)
1208 /* Move the tail position by APPEND_COUNT characters. */
1209 #define TAIL_INCR(r, append_count) ((r)->tail += append_count)
1211 /* Append the string STR to DEST. NOTICE: the string in DEST is not
1215 append_string (const char *str, struct growable *dest)
1217 int l = strlen (str);
1219 memcpy (TAIL (dest), str, l);
1220 TAIL_INCR (dest, l);
1223 /* Append CH to DEST. For example, append_char (0, DEST)
1224 zero-terminates DEST. */
1227 append_char (char ch, struct growable *dest)
1231 TAIL_INCR (dest, 1);
1235 filechr_not_unix = 1, /* unusable on Unix, / and \0 */
1236 filechr_not_windows = 2, /* unusable on Windows, one of \|/<>?:*" */
1237 filechr_control = 4 /* a control character, e.g. 0-31 */
1240 #define FILE_CHAR_TEST(c, mask) (filechr_table[(unsigned char)(c)] & (mask))
1242 /* Shorthands for the table: */
1243 #define U filechr_not_unix
1244 #define W filechr_not_windows
1245 #define C filechr_control
1250 /* Table of characters unsafe under various conditions (see above).
1252 Arguably we could also claim `%' to be unsafe, since we use it as
1253 the escape character. If we ever want to be able to reliably
1254 translate file name back to URL, this would become important
1255 crucial. Right now, it's better to be minimal in escaping. */
1257 static const unsigned char filechr_table[256] =
1259 UWC, C, C, C, C, C, C, C, /* NUL SOH STX ETX EOT ENQ ACK BEL */
1260 C, C, C, C, C, C, C, C, /* BS HT LF VT FF CR SO SI */
1261 C, C, C, C, C, C, C, C, /* DLE DC1 DC2 DC3 DC4 NAK SYN ETB */
1262 C, C, C, C, C, C, C, C, /* CAN EM SUB ESC FS GS RS US */
1263 0, 0, W, 0, 0, 0, 0, 0, /* SP ! " # $ % & ' */
1264 0, 0, W, 0, 0, 0, 0, UW, /* ( ) * + , - . / */
1265 0, 0, 0, 0, 0, 0, 0, 0, /* 0 1 2 3 4 5 6 7 */
1266 0, 0, W, 0, W, 0, W, W, /* 8 9 : ; < = > ? */
1267 0, 0, 0, 0, 0, 0, 0, 0, /* @ A B C D E F G */
1268 0, 0, 0, 0, 0, 0, 0, 0, /* H I J K L M N O */
1269 0, 0, 0, 0, 0, 0, 0, 0, /* P Q R S T U V W */
1270 0, 0, 0, 0, W, 0, 0, 0, /* X Y Z [ \ ] ^ _ */
1271 0, 0, 0, 0, 0, 0, 0, 0, /* ` a b c d e f g */
1272 0, 0, 0, 0, 0, 0, 0, 0, /* h i j k l m n o */
1273 0, 0, 0, 0, 0, 0, 0, 0, /* p q r s t u v w */
1274 0, 0, 0, 0, 0, 0, 0, 0, /* x y z { | } ~ DEL */
1276 C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, /* 128-143 */
1277 C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, /* 144-159 */
1278 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1279 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1281 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1282 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1283 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1284 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1292 /* FN_PORT_SEP is the separator between host and port in file names
1293 for non-standard port numbers. On Unix this is normally ':', as in
1294 "www.xemacs.org:4001/index.html". Under Windows, we set it to +
1295 because Windows can't handle ':' in file names. */
1296 #define FN_PORT_SEP (opt.restrict_files_os != restrict_windows ? ':' : '+')
1298 /* FN_QUERY_SEP is the separator between the file name and the URL
1299 query, normally '?'. Since Windows cannot handle '?' as part of
1300 file name, we use '@' instead there. */
1301 #define FN_QUERY_SEP (opt.restrict_files_os != restrict_windows ? '?' : '@')
1303 /* Quote path element, characters in [b, e), as file name, and append
1304 the quoted string to DEST. Each character is quoted as per
1305 file_unsafe_char and the corresponding table.
1307 If ESCAPED_P is non-zero, the path element is considered to be
1308 URL-escaped and will be unescaped prior to inspection. */
1311 append_uri_pathel (const char *b, const char *e, int escaped_p,
1312 struct growable *dest)
1318 if (opt.restrict_files_os == restrict_unix)
1319 mask = filechr_not_unix;
1321 mask = filechr_not_windows;
1322 if (opt.restrict_files_ctrl)
1323 mask |= filechr_control;
1325 /* Copy [b, e) to PATHEL and URL-unescape it. */
1329 BOUNDED_TO_ALLOCA (b, e, unescaped);
1330 url_unescape (unescaped);
1332 e = unescaped + strlen (unescaped);
1335 /* Defang ".." when found as component of path. Remember that path
1336 comes from the URL and might contain malicious input. */
1337 if (e - b == 2 && b[0] == '.' && b[1] == '.')
1343 /* Walk the PATHEL string and check how many characters we'll need
1346 for (p = b; p < e; p++)
1347 if (FILE_CHAR_TEST (*p, mask))
1350 /* Calculate the length of the output string. e-b is the input
1351 string length. Each quoted char introduces two additional
1352 characters in the string, hence 2*quoted. */
1353 outlen = (e - b) + (2 * quoted);
1354 GROW (dest, outlen);
1358 /* If there's nothing to quote, we can simply append the string
1359 without processing it again. */
1360 memcpy (TAIL (dest), b, outlen);
1364 char *q = TAIL (dest);
1365 for (p = b; p < e; p++)
1367 if (!FILE_CHAR_TEST (*p, mask))
1371 unsigned char ch = *p;
1373 *q++ = XNUM_TO_DIGIT (ch >> 4);
1374 *q++ = XNUM_TO_DIGIT (ch & 0xf);
1377 assert (q - TAIL (dest) == outlen);
1379 TAIL_INCR (dest, outlen);
1382 /* Append to DEST the directory structure that corresponds the
1383 directory part of URL's path. For example, if the URL is
1384 http://server/dir1/dir2/file, this appends "/dir1/dir2".
1386 Each path element ("dir1" and "dir2" in the above example) is
1387 examined, url-unescaped, and re-escaped as file name element.
1389 Additionally, it cuts as many directories from the path as
1390 specified by opt.cut_dirs. For example, if opt.cut_dirs is 1, it
1391 will produce "bar" for the above example. For 2 or more, it will
1394 Each component of the path is quoted for use as file name. */
1397 append_dir_structure (const struct url *u, struct growable *dest)
1399 char *pathel, *next;
1400 int cut = opt.cut_dirs;
1402 /* Go through the path components, de-URL-quote them, and quote them
1403 (if necessary) as file names. */
1406 for (; (next = strchr (pathel, '/')) != NULL; pathel = next + 1)
1411 /* Ignore empty pathels. */
1415 append_char ('/', dest);
1416 append_uri_pathel (pathel, next, 1, dest);
1420 /* Return a unique file name that matches the given URL as good as
1421 possible. Does not create directories on the file system. */
1424 url_file_name (const struct url *u)
1426 struct growable fnres; /* stands for "file name result" */
1428 const char *u_file, *u_query;
1429 char *fname, *unique;
1435 /* Start with the directory prefix, if specified. */
1437 append_string (opt.dir_prefix, &fnres);
1439 /* If "dirstruct" is turned on (typically the case with -r), add
1440 the host and port (unless those have been turned off) and
1441 directory structure. */
1444 if (opt.protocol_directories)
1447 append_char ('/', &fnres);
1448 append_string (supported_schemes[u->scheme].name, &fnres);
1450 if (opt.add_hostdir)
1453 append_char ('/', &fnres);
1454 if (0 != strcmp (u->host, ".."))
1455 append_string (u->host, &fnres);
1457 /* Host name can come from the network; malicious DNS may
1458 allow ".." to be resolved, causing us to write to
1459 "../<file>". Defang such host names. */
1460 append_string ("%2E%2E", &fnres);
1461 if (u->port != scheme_default_port (u->scheme))
1464 number_to_string (portstr, u->port);
1465 append_char (FN_PORT_SEP, &fnres);
1466 append_string (portstr, &fnres);
1470 append_dir_structure (u, &fnres);
1473 /* Add the file name. */
1475 append_char ('/', &fnres);
1476 u_file = *u->file ? u->file : "index.html";
1477 append_uri_pathel (u_file, u_file + strlen (u_file), 0, &fnres);
1479 /* Append "?query" to the file name. */
1480 u_query = u->query && *u->query ? u->query : NULL;
1483 append_char (FN_QUERY_SEP, &fnres);
1484 append_uri_pathel (u_query, u_query + strlen (u_query), 1, &fnres);
1487 /* Zero-terminate the file name. */
1488 append_char ('\0', &fnres);
1492 /* Check the cases in which the unique extensions are not used:
1493 1) Clobbering is turned off (-nc).
1494 2) Retrieval with regetting.
1495 3) Timestamping is used.
1496 4) Hierarchy is built.
1498 The exception is the case when file does exist and is a
1499 directory (see `mkalldirs' for explanation). */
1501 if ((opt.noclobber || opt.always_rest || opt.timestamping || opt.dirstruct)
1502 && !(file_exists_p (fname) && !file_non_directory_p (fname)))
1505 unique = unique_name (fname, 1);
1506 if (unique != fname)
1511 /* Resolve "." and ".." elements of PATH by destructively modifying
1512 PATH and return non-zero if PATH has been modified, zero otherwise.
1514 The algorithm is in spirit similar to the one described in rfc1808,
1515 although implemented differently, in one pass. To recap, path
1516 elements containing only "." are removed, and ".." is taken to mean
1517 "back up one element". Single leading and trailing slashes are
1520 For example, "a/b/c/./../d/.." will yield "a/b/". More exhaustive
1521 test examples are provided below. If you change anything in this
1522 function, run test_path_simplify to make sure you haven't broken a
1526 path_simplify (char *path)
1528 char *h = path; /* hare */
1529 char *t = path; /* tortoise */
1530 char *beg = path; /* boundary for backing the tortoise */
1531 char *end = path + strlen (path);
1535 /* Hare should be at the beginning of a path element. */
1537 if (h[0] == '.' && (h[1] == '/' || h[1] == '\0'))
1542 else if (h[0] == '.' && h[1] == '.' && (h[2] == '/' || h[2] == '\0'))
1544 /* Handle "../" by retreating the tortoise by one path
1545 element -- but not past beggining. */
1548 /* Move backwards until T hits the beginning of the
1549 previous path element or the beginning of path. */
1550 for (--t; t > beg && t[-1] != '/'; t--)
1555 /* If we're at the beginning, copy the "../" literally
1556 move the beginning so a later ".." doesn't remove
1566 /* A regular path element. If H hasn't advanced past T,
1567 simply skip to the next path element. Otherwise, copy
1568 the path element until the next slash. */
1571 /* Skip the path element, including the slash. */
1572 while (h < end && *h != '/')
1579 /* Copy the path element, including the final slash. */
1580 while (h < end && *h != '/')
1594 /* Return the length of URL's path. Path is considered to be
1595 terminated by one of '?', ';', '#', or by the end of the
1599 path_length (const char *url)
1601 const char *q = strpbrk_or_eos (url, "?;#");
1605 /* Find the last occurrence of character C in the range [b, e), or
1606 NULL, if none are present. We might want to use memrchr (a GNU
1607 extension) under GNU libc. */
1610 find_last_char (const char *b, const char *e, char c)
1618 /* Merge BASE with LINK and return the resulting URI.
1620 Either of the URIs may be absolute or relative, complete with the
1621 host name, or path only. This tries to reasonably handle all
1622 foreseeable cases. It only employs minimal URL parsing, without
1623 knowledge of the specifics of schemes.
1625 I briefly considered making this function call path_simplify after
1626 the merging process, as rfc1738 seems to suggest. This is a bad
1627 idea for several reasons: 1) it complexifies the code, and 2)
1628 url_parse has to simplify path anyway, so it's wasteful to boot. */
1631 uri_merge (const char *base, const char *link)
1637 if (url_has_scheme (link))
1638 return xstrdup (link);
1640 /* We may not examine BASE past END. */
1641 end = base + path_length (base);
1642 linklength = strlen (link);
1646 /* Empty LINK points back to BASE, query string and all. */
1647 return xstrdup (base);
1649 else if (*link == '?')
1651 /* LINK points to the same location, but changes the query
1652 string. Examples: */
1653 /* uri_merge("path", "?new") -> "path?new" */
1654 /* uri_merge("path?foo", "?new") -> "path?new" */
1655 /* uri_merge("path?foo#bar", "?new") -> "path?new" */
1656 /* uri_merge("path#foo", "?new") -> "path?new" */
1657 int baselength = end - base;
1658 merge = xmalloc (baselength + linklength + 1);
1659 memcpy (merge, base, baselength);
1660 memcpy (merge + baselength, link, linklength);
1661 merge[baselength + linklength] = '\0';
1663 else if (*link == '#')
1665 /* uri_merge("path", "#new") -> "path#new" */
1666 /* uri_merge("path#foo", "#new") -> "path#new" */
1667 /* uri_merge("path?foo", "#new") -> "path?foo#new" */
1668 /* uri_merge("path?foo#bar", "#new") -> "path?foo#new" */
1670 const char *end1 = strchr (base, '#');
1672 end1 = base + strlen (base);
1673 baselength = end1 - base;
1674 merge = xmalloc (baselength + linklength + 1);
1675 memcpy (merge, base, baselength);
1676 memcpy (merge + baselength, link, linklength);
1677 merge[baselength + linklength] = '\0';
1679 else if (*link == '/' && *(link + 1) == '/')
1681 /* LINK begins with "//" and so is a net path: we need to
1682 replace everything after (and including) the double slash
1685 /* uri_merge("foo", "//new/bar") -> "//new/bar" */
1686 /* uri_merge("//old/foo", "//new/bar") -> "//new/bar" */
1687 /* uri_merge("http://old/foo", "//new/bar") -> "http://new/bar" */
1691 const char *start_insert;
1693 /* Look for first slash. */
1694 slash = memchr (base, '/', end - base);
1695 /* If found slash and it is a double slash, then replace
1696 from this point, else default to replacing from the
1698 if (slash && *(slash + 1) == '/')
1699 start_insert = slash;
1701 start_insert = base;
1703 span = start_insert - base;
1704 merge = (char *)xmalloc (span + linklength + 1);
1706 memcpy (merge, base, span);
1707 memcpy (merge + span, link, linklength);
1708 merge[span + linklength] = '\0';
1710 else if (*link == '/')
1712 /* LINK is an absolute path: we need to replace everything
1713 after (and including) the FIRST slash with LINK.
1715 So, if BASE is "http://host/whatever/foo/bar", and LINK is
1716 "/qux/xyzzy", our result should be
1717 "http://host/qux/xyzzy". */
1720 const char *start_insert = NULL; /* for gcc to shut up. */
1721 const char *pos = base;
1722 int seen_slash_slash = 0;
1723 /* We're looking for the first slash, but want to ignore
1726 slash = memchr (pos, '/', end - pos);
1727 if (slash && !seen_slash_slash)
1728 if (*(slash + 1) == '/')
1731 seen_slash_slash = 1;
1735 /* At this point, SLASH is the location of the first / after
1736 "//", or the first slash altogether. START_INSERT is the
1737 pointer to the location where LINK will be inserted. When
1738 examining the last two examples, keep in mind that LINK
1741 if (!slash && !seen_slash_slash)
1742 /* example: "foo" */
1744 start_insert = base;
1745 else if (!slash && seen_slash_slash)
1746 /* example: "http://foo" */
1749 else if (slash && !seen_slash_slash)
1750 /* example: "foo/bar" */
1752 start_insert = base;
1753 else if (slash && seen_slash_slash)
1754 /* example: "http://something/" */
1756 start_insert = slash;
1758 span = start_insert - base;
1759 merge = (char *)xmalloc (span + linklength + 1);
1761 memcpy (merge, base, span);
1762 memcpy (merge + span, link, linklength);
1763 merge[span + linklength] = '\0';
1767 /* LINK is a relative URL: we need to replace everything
1768 after last slash (possibly empty) with LINK.
1770 So, if BASE is "whatever/foo/bar", and LINK is "qux/xyzzy",
1771 our result should be "whatever/foo/qux/xyzzy". */
1772 int need_explicit_slash = 0;
1774 const char *start_insert;
1775 const char *last_slash = find_last_char (base, end, '/');
1778 /* No slash found at all. Replace what we have with LINK. */
1779 start_insert = base;
1781 else if (last_slash && last_slash >= base + 2
1782 && last_slash[-2] == ':' && last_slash[-1] == '/')
1784 /* example: http://host" */
1786 start_insert = end + 1;
1787 need_explicit_slash = 1;
1791 /* example: "whatever/foo/bar" */
1793 start_insert = last_slash + 1;
1796 span = start_insert - base;
1797 merge = (char *)xmalloc (span + linklength + 1);
1799 memcpy (merge, base, span);
1800 if (need_explicit_slash)
1801 merge[span - 1] = '/';
1802 memcpy (merge + span, link, linklength);
1803 merge[span + linklength] = '\0';
1809 #define APPEND(p, s) do { \
1810 int len = strlen (s); \
1811 memcpy (p, s, len); \
1815 /* Use this instead of password when the actual password is supposed
1816 to be hidden. We intentionally use a generic string without giving
1817 away the number of characters in the password, like previous
1819 #define HIDDEN_PASSWORD "*password*"
1821 /* Recreate the URL string from the data in URL.
1823 If HIDE is non-zero (as it is when we're calling this on a URL we
1824 plan to print, but not when calling it to canonicalize a URL for
1825 use within the program), password will be hidden. Unsafe
1826 characters in the URL will be quoted. */
1829 url_string (const struct url *url, int hide_password)
1833 char *quoted_host, *quoted_user = NULL, *quoted_passwd = NULL;
1835 int scheme_port = supported_schemes[url->scheme].default_port;
1836 const char *scheme_str = supported_schemes[url->scheme].leading_string;
1837 int fplen = full_path_length (url);
1839 int brackets_around_host;
1841 assert (scheme_str != NULL);
1843 /* Make sure the user name and password are quoted. */
1846 quoted_user = url_escape_allow_passthrough (url->user);
1850 quoted_passwd = HIDDEN_PASSWORD;
1852 quoted_passwd = url_escape_allow_passthrough (url->passwd);
1856 /* In the unlikely event that the host name contains non-printable
1857 characters, quote it for displaying to the user. */
1858 quoted_host = url_escape_allow_passthrough (url->host);
1860 /* Undo the quoting of colons that URL escaping performs. IPv6
1861 addresses may legally contain colons, and in that case must be
1862 placed in square brackets. */
1863 if (quoted_host != url->host)
1864 unescape_single_char (quoted_host, ':');
1865 brackets_around_host = strchr (quoted_host, ':') != NULL;
1867 size = (strlen (scheme_str)
1868 + strlen (quoted_host)
1869 + (brackets_around_host ? 2 : 0)
1872 if (url->port != scheme_port)
1873 size += 1 + numdigit (url->port);
1876 size += 1 + strlen (quoted_user);
1878 size += 1 + strlen (quoted_passwd);
1881 p = result = xmalloc (size);
1883 APPEND (p, scheme_str);
1886 APPEND (p, quoted_user);
1890 APPEND (p, quoted_passwd);
1895 if (brackets_around_host)
1897 APPEND (p, quoted_host);
1898 if (brackets_around_host)
1900 if (url->port != scheme_port)
1903 p = number_to_string (p, url->port);
1906 full_path_write (url, p);
1910 assert (p - result == size);
1912 if (quoted_user && quoted_user != url->user)
1913 xfree (quoted_user);
1914 if (quoted_passwd && !hide_password && quoted_passwd != url->passwd)
1915 xfree (quoted_passwd);
1916 if (quoted_host != url->host)
1917 xfree (quoted_host);
1922 /* Return non-zero if scheme a is similar to scheme b.
1924 Schemes are similar if they are equal. If SSL is supported, schemes
1925 are also similar if one is http (SCHEME_HTTP) and the other is https
1928 schemes_are_similar_p (enum url_scheme a, enum url_scheme b)
1933 if ((a == SCHEME_HTTP && b == SCHEME_HTTPS)
1934 || (a == SCHEME_HTTPS && b == SCHEME_HTTP))
1941 /* Debugging and testing support for path_simplify. */
1943 /* Debug: run path_simplify on PATH and return the result in a new
1944 string. Useful for calling from the debugger. */
1948 char *copy = xstrdup (path);
1949 path_simplify (copy);
1954 run_test (char *test, char *expected_result, int expected_change)
1956 char *test_copy = xstrdup (test);
1957 int modified = path_simplify (test_copy);
1959 if (0 != strcmp (test_copy, expected_result))
1961 printf ("Failed path_simplify(\"%s\"): expected \"%s\", got \"%s\".\n",
1962 test, expected_result, test_copy);
1964 if (modified != expected_change)
1966 if (expected_change == 1)
1967 printf ("Expected modification with path_simplify(\"%s\").\n",
1970 printf ("Expected no modification with path_simplify(\"%s\").\n",
1977 test_path_simplify (void)
1980 char *test, *result;
1987 { "../", "../", 0 },
1988 { "foo", "foo", 0 },
1989 { "foo/bar", "foo/bar", 0 },
1990 { "foo///bar", "foo///bar", 0 },
1991 { "foo/.", "foo/", 1 },
1992 { "foo/./", "foo/", 1 },
1993 { "foo./", "foo./", 0 },
1994 { "foo/../bar", "bar", 1 },
1995 { "foo/../bar/", "bar/", 1 },
1996 { "foo/bar/..", "foo/", 1 },
1997 { "foo/bar/../x", "foo/x", 1 },
1998 { "foo/bar/../x/", "foo/x/", 1 },
1999 { "foo/..", "", 1 },
2000 { "foo/../..", "..", 1 },
2001 { "foo/../../..", "../..", 1 },
2002 { "foo/../../bar/../../baz", "../../baz", 1 },
2003 { "a/b/../../c", "c", 1 },
2004 { "./a/../b", "b", 1 }
2008 for (i = 0; i < countof (tests); i++)
2010 char *test = tests[i].test;
2011 char *expected_result = tests[i].result;
2012 int expected_change = tests[i].should_modify;
2013 run_test (test, expected_result, expected_change);