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Diffstat (limited to 'uri.c')
| -rw-r--r-- | uri.c | 2249 |
1 files changed, 2249 insertions, 0 deletions
@@ -0,0 +1,2249 @@ +/** + * uri.c: set of generic URI related routines + * + * Reference: RFCs 3986, 2732 and 2373 + * + * Copyright (C) 1998-2003 Daniel Veillard. All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * DANIEL VEILLARD BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER + * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the name of Daniel Veillard shall not + * be used in advertising or otherwise to promote the sale, use or other + * dealings in this Software without prior written authorization from him. + * + * daniel@veillard.com + * + ** + * + * Copyright (C) 2007, 2009-2010 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Authors: + * Richard W.M. Jones <rjones@redhat.com> + * + */ + +#include <glib.h> +#include <string.h> +#include <stdio.h> + +#include "qemu/uri.h" + +static void uri_clean(URI *uri); + +/* + * Old rule from 2396 used in legacy handling code + * alpha = lowalpha | upalpha + */ +#define IS_ALPHA(x) (IS_LOWALPHA(x) || IS_UPALPHA(x)) + + +/* + * lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" | + * "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t" | + * "u" | "v" | "w" | "x" | "y" | "z" + */ + +#define IS_LOWALPHA(x) (((x) >= 'a') && ((x) <= 'z')) + +/* + * upalpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | + * "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" | + * "U" | "V" | "W" | "X" | "Y" | "Z" + */ +#define IS_UPALPHA(x) (((x) >= 'A') && ((x) <= 'Z')) + +#ifdef IS_DIGIT +#undef IS_DIGIT +#endif +/* + * digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" + */ +#define IS_DIGIT(x) (((x) >= '0') && ((x) <= '9')) + +/* + * alphanum = alpha | digit + */ + +#define IS_ALPHANUM(x) (IS_ALPHA(x) || IS_DIGIT(x)) + +/* + * mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")" + */ + +#define IS_MARK(x) (((x) == '-') || ((x) == '_') || ((x) == '.') || \ + ((x) == '!') || ((x) == '~') || ((x) == '*') || ((x) == '\'') || \ + ((x) == '(') || ((x) == ')')) + +/* + * unwise = "{" | "}" | "|" | "\" | "^" | "`" + */ + +#define IS_UNWISE(p) \ + (((*(p) == '{')) || ((*(p) == '}')) || ((*(p) == '|')) || \ + ((*(p) == '\\')) || ((*(p) == '^')) || ((*(p) == '[')) || \ + ((*(p) == ']')) || ((*(p) == '`'))) +/* + * reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | "," | + * "[" | "]" + */ + +#define IS_RESERVED(x) (((x) == ';') || ((x) == '/') || ((x) == '?') || \ + ((x) == ':') || ((x) == '@') || ((x) == '&') || ((x) == '=') || \ + ((x) == '+') || ((x) == '$') || ((x) == ',') || ((x) == '[') || \ + ((x) == ']')) + +/* + * unreserved = alphanum | mark + */ + +#define IS_UNRESERVED(x) (IS_ALPHANUM(x) || IS_MARK(x)) + +/* + * Skip to next pointer char, handle escaped sequences + */ + +#define NEXT(p) ((*p == '%')? p += 3 : p++) + +/* + * Productions from the spec. + * + * authority = server | reg_name + * reg_name = 1*( unreserved | escaped | "$" | "," | + * ";" | ":" | "@" | "&" | "=" | "+" ) + * + * path = [ abs_path | opaque_part ] + */ + + +/************************************************************************ + * * + * RFC 3986 parser * + * * + ************************************************************************/ + +#define ISA_DIGIT(p) ((*(p) >= '0') && (*(p) <= '9')) +#define ISA_ALPHA(p) (((*(p) >= 'a') && (*(p) <= 'z')) || \ + ((*(p) >= 'A') && (*(p) <= 'Z'))) +#define ISA_HEXDIG(p) \ + (ISA_DIGIT(p) || ((*(p) >= 'a') && (*(p) <= 'f')) || \ + ((*(p) >= 'A') && (*(p) <= 'F'))) + +/* + * sub-delims = "!" / "$" / "&" / "'" / "(" / ")" + * / "*" / "+" / "," / ";" / "=" + */ +#define ISA_SUB_DELIM(p) \ + (((*(p) == '!')) || ((*(p) == '$')) || ((*(p) == '&')) || \ + ((*(p) == '(')) || ((*(p) == ')')) || ((*(p) == '*')) || \ + ((*(p) == '+')) || ((*(p) == ',')) || ((*(p) == ';')) || \ + ((*(p) == '=')) || ((*(p) == '\''))) + +/* + * gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@" + */ +#define ISA_GEN_DELIM(p) \ + (((*(p) == ':')) || ((*(p) == '/')) || ((*(p) == '?')) || \ + ((*(p) == '#')) || ((*(p) == '[')) || ((*(p) == ']')) || \ + ((*(p) == '@'))) + +/* + * reserved = gen-delims / sub-delims + */ +#define ISA_RESERVED(p) (ISA_GEN_DELIM(p) || (ISA_SUB_DELIM(p))) + +/* + * unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" + */ +#define ISA_UNRESERVED(p) \ + ((ISA_ALPHA(p)) || (ISA_DIGIT(p)) || ((*(p) == '-')) || \ + ((*(p) == '.')) || ((*(p) == '_')) || ((*(p) == '~'))) + +/* + * pct-encoded = "%" HEXDIG HEXDIG + */ +#define ISA_PCT_ENCODED(p) \ + ((*(p) == '%') && (ISA_HEXDIG(p + 1)) && (ISA_HEXDIG(p + 2))) + +/* + * pchar = unreserved / pct-encoded / sub-delims / ":" / "@" + */ +#define ISA_PCHAR(p) \ + (ISA_UNRESERVED(p) || ISA_PCT_ENCODED(p) || ISA_SUB_DELIM(p) || \ + ((*(p) == ':')) || ((*(p) == '@'))) + +/** + * rfc3986_parse_scheme: + * @uri: pointer to an URI structure + * @str: pointer to the string to analyze + * + * Parse an URI scheme + * + * ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_scheme(URI *uri, const char **str) { + const char *cur; + + if (str == NULL) + return(-1); + + cur = *str; + if (!ISA_ALPHA(cur)) + return(2); + cur++; + while (ISA_ALPHA(cur) || ISA_DIGIT(cur) || + (*cur == '+') || (*cur == '-') || (*cur == '.')) cur++; + if (uri != NULL) { + if (uri->scheme != NULL) g_free(uri->scheme); + uri->scheme = g_strndup(*str, cur - *str); + } + *str = cur; + return(0); +} + +/** + * rfc3986_parse_fragment: + * @uri: pointer to an URI structure + * @str: pointer to the string to analyze + * + * Parse the query part of an URI + * + * fragment = *( pchar / "/" / "?" ) + * NOTE: the strict syntax as defined by 3986 does not allow '[' and ']' + * in the fragment identifier but this is used very broadly for + * xpointer scheme selection, so we are allowing it here to not break + * for example all the DocBook processing chains. + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_fragment(URI *uri, const char **str) +{ + const char *cur; + + if (str == NULL) + return (-1); + + cur = *str; + + while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') || + (*cur == '[') || (*cur == ']') || + ((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur)))) + NEXT(cur); + if (uri != NULL) { + if (uri->fragment != NULL) + g_free(uri->fragment); + if (uri->cleanup & 2) + uri->fragment = g_strndup(*str, cur - *str); + else + uri->fragment = uri_string_unescape(*str, cur - *str, NULL); + } + *str = cur; + return (0); +} + +/** + * rfc3986_parse_query: + * @uri: pointer to an URI structure + * @str: pointer to the string to analyze + * + * Parse the query part of an URI + * + * query = *uric + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_query(URI *uri, const char **str) +{ + const char *cur; + + if (str == NULL) + return (-1); + + cur = *str; + + while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') || + ((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur)))) + NEXT(cur); + if (uri != NULL) { + if (uri->query != NULL) + g_free (uri->query); + uri->query = g_strndup (*str, cur - *str); + } + *str = cur; + return (0); +} + +/** + * rfc3986_parse_port: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse a port part and fills in the appropriate fields + * of the @uri structure + * + * port = *DIGIT + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_port(URI *uri, const char **str) +{ + const char *cur = *str; + + if (ISA_DIGIT(cur)) { + if (uri != NULL) + uri->port = 0; + while (ISA_DIGIT(cur)) { + if (uri != NULL) + uri->port = uri->port * 10 + (*cur - '0'); + cur++; + } + *str = cur; + return(0); + } + return(1); +} + +/** + * rfc3986_parse_user_info: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an user informations part and fills in the appropriate fields + * of the @uri structure + * + * userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_user_info(URI *uri, const char **str) +{ + const char *cur; + + cur = *str; + while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) || + ISA_SUB_DELIM(cur) || (*cur == ':')) + NEXT(cur); + if (*cur == '@') { + if (uri != NULL) { + if (uri->user != NULL) g_free(uri->user); + if (uri->cleanup & 2) + uri->user = g_strndup(*str, cur - *str); + else + uri->user = uri_string_unescape(*str, cur - *str, NULL); + } + *str = cur; + return(0); + } + return(1); +} + +/** + * rfc3986_parse_dec_octet: + * @str: the string to analyze + * + * dec-octet = DIGIT ; 0-9 + * / %x31-39 DIGIT ; 10-99 + * / "1" 2DIGIT ; 100-199 + * / "2" %x30-34 DIGIT ; 200-249 + * / "25" %x30-35 ; 250-255 + * + * Skip a dec-octet. + * + * Returns 0 if found and skipped, 1 otherwise + */ +static int +rfc3986_parse_dec_octet(const char **str) { + const char *cur = *str; + + if (!(ISA_DIGIT(cur))) + return(1); + if (!ISA_DIGIT(cur+1)) + cur++; + else if ((*cur != '0') && (ISA_DIGIT(cur + 1)) && (!ISA_DIGIT(cur+2))) + cur += 2; + else if ((*cur == '1') && (ISA_DIGIT(cur + 1)) && (ISA_DIGIT(cur + 2))) + cur += 3; + else if ((*cur == '2') && (*(cur + 1) >= '0') && + (*(cur + 1) <= '4') && (ISA_DIGIT(cur + 2))) + cur += 3; + else if ((*cur == '2') && (*(cur + 1) == '5') && + (*(cur + 2) >= '0') && (*(cur + 1) <= '5')) + cur += 3; + else + return(1); + *str = cur; + return(0); +} +/** + * rfc3986_parse_host: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an host part and fills in the appropriate fields + * of the @uri structure + * + * host = IP-literal / IPv4address / reg-name + * IP-literal = "[" ( IPv6address / IPvFuture ) "]" + * IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet + * reg-name = *( unreserved / pct-encoded / sub-delims ) + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_host(URI *uri, const char **str) +{ + const char *cur = *str; + const char *host; + + host = cur; + /* + * IPv6 and future addressing scheme are enclosed between brackets + */ + if (*cur == '[') { + cur++; + while ((*cur != ']') && (*cur != 0)) + cur++; + if (*cur != ']') + return(1); + cur++; + goto found; + } + /* + * try to parse an IPv4 + */ + if (ISA_DIGIT(cur)) { + if (rfc3986_parse_dec_octet(&cur) != 0) + goto not_ipv4; + if (*cur != '.') + goto not_ipv4; + cur++; + if (rfc3986_parse_dec_octet(&cur) != 0) + goto not_ipv4; + if (*cur != '.') + goto not_ipv4; + if (rfc3986_parse_dec_octet(&cur) != 0) + goto not_ipv4; + if (*cur != '.') + goto not_ipv4; + if (rfc3986_parse_dec_octet(&cur) != 0) + goto not_ipv4; + goto found; +not_ipv4: + cur = *str; + } + /* + * then this should be a hostname which can be empty + */ + while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) || ISA_SUB_DELIM(cur)) + NEXT(cur); +found: + if (uri != NULL) { + if (uri->authority != NULL) g_free(uri->authority); + uri->authority = NULL; + if (uri->server != NULL) g_free(uri->server); + if (cur != host) { + if (uri->cleanup & 2) + uri->server = g_strndup(host, cur - host); + else + uri->server = uri_string_unescape(host, cur - host, NULL); + } else + uri->server = NULL; + } + *str = cur; + return(0); +} + +/** + * rfc3986_parse_authority: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an authority part and fills in the appropriate fields + * of the @uri structure + * + * authority = [ userinfo "@" ] host [ ":" port ] + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_authority(URI *uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + /* + * try to parse an userinfo and check for the trailing @ + */ + ret = rfc3986_parse_user_info(uri, &cur); + if ((ret != 0) || (*cur != '@')) + cur = *str; + else + cur++; + ret = rfc3986_parse_host(uri, &cur); + if (ret != 0) return(ret); + if (*cur == ':') { + cur++; + ret = rfc3986_parse_port(uri, &cur); + if (ret != 0) return(ret); + } + *str = cur; + return(0); +} + +/** + * rfc3986_parse_segment: + * @str: the string to analyze + * @forbid: an optional forbidden character + * @empty: allow an empty segment + * + * Parse a segment and fills in the appropriate fields + * of the @uri structure + * + * segment = *pchar + * segment-nz = 1*pchar + * segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" ) + * ; non-zero-length segment without any colon ":" + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_segment(const char **str, char forbid, int empty) +{ + const char *cur; + + cur = *str; + if (!ISA_PCHAR(cur)) { + if (empty) + return(0); + return(1); + } + while (ISA_PCHAR(cur) && (*cur != forbid)) + NEXT(cur); + *str = cur; + return (0); +} + +/** + * rfc3986_parse_path_ab_empty: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path absolute or empty and fills in the appropriate fields + * of the @uri structure + * + * path-abempty = *( "/" segment ) + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_path_ab_empty(URI *uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + while (*cur == '/') { + cur++; + ret = rfc3986_parse_segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + if (uri != NULL) { + if (uri->path != NULL) g_free(uri->path); + if (*str != cur) { + if (uri->cleanup & 2) + uri->path = g_strndup(*str, cur - *str); + else + uri->path = uri_string_unescape(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * rfc3986_parse_path_absolute: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path absolute and fills in the appropriate fields + * of the @uri structure + * + * path-absolute = "/" [ segment-nz *( "/" segment ) ] + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_path_absolute(URI *uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + if (*cur != '/') + return(1); + cur++; + ret = rfc3986_parse_segment(&cur, 0, 0); + if (ret == 0) { + while (*cur == '/') { + cur++; + ret = rfc3986_parse_segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + } + if (uri != NULL) { + if (uri->path != NULL) g_free(uri->path); + if (cur != *str) { + if (uri->cleanup & 2) + uri->path = g_strndup(*str, cur - *str); + else + uri->path = uri_string_unescape(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * rfc3986_parse_path_rootless: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path without root and fills in the appropriate fields + * of the @uri structure + * + * path-rootless = segment-nz *( "/" segment ) + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_path_rootless(URI *uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + ret = rfc3986_parse_segment(&cur, 0, 0); + if (ret != 0) return(ret); + while (*cur == '/') { + cur++; + ret = rfc3986_parse_segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + if (uri != NULL) { + if (uri->path != NULL) g_free(uri->path); + if (cur != *str) { + if (uri->cleanup & 2) + uri->path = g_strndup(*str, cur - *str); + else + uri->path = uri_string_unescape(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * rfc3986_parse_path_no_scheme: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an path which is not a scheme and fills in the appropriate fields + * of the @uri structure + * + * path-noscheme = segment-nz-nc *( "/" segment ) + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_path_no_scheme(URI *uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + ret = rfc3986_parse_segment(&cur, ':', 0); + if (ret != 0) return(ret); + while (*cur == '/') { + cur++; + ret = rfc3986_parse_segment(&cur, 0, 1); + if (ret != 0) return(ret); + } + if (uri != NULL) { + if (uri->path != NULL) g_free(uri->path); + if (cur != *str) { + if (uri->cleanup & 2) + uri->path = g_strndup(*str, cur - *str); + else + uri->path = uri_string_unescape(*str, cur - *str, NULL); + } else { + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * rfc3986_parse_hier_part: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an hierarchical part and fills in the appropriate fields + * of the @uri structure + * + * hier-part = "//" authority path-abempty + * / path-absolute + * / path-rootless + * / path-empty + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_hier_part(URI *uri, const char **str) +{ + const char *cur; + int ret; + + cur = *str; + + if ((*cur == '/') && (*(cur + 1) == '/')) { + cur += 2; + ret = rfc3986_parse_authority(uri, &cur); + if (ret != 0) return(ret); + ret = rfc3986_parse_path_ab_empty(uri, &cur); + if (ret != 0) return(ret); + *str = cur; + return(0); + } else if (*cur == '/') { + ret = rfc3986_parse_path_absolute(uri, &cur); + if (ret != 0) return(ret); + } else if (ISA_PCHAR(cur)) { + ret = rfc3986_parse_path_rootless(uri, &cur); + if (ret != 0) return(ret); + } else { + /* path-empty is effectively empty */ + if (uri != NULL) { + if (uri->path != NULL) g_free(uri->path); + uri->path = NULL; + } + } + *str = cur; + return (0); +} + +/** + * rfc3986_parse_relative_ref: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI string and fills in the appropriate fields + * of the @uri structure + * + * relative-ref = relative-part [ "?" query ] [ "#" fragment ] + * relative-part = "//" authority path-abempty + * / path-absolute + * / path-noscheme + * / path-empty + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_relative_ref(URI *uri, const char *str) { + int ret; + + if ((*str == '/') && (*(str + 1) == '/')) { + str += 2; + ret = rfc3986_parse_authority(uri, &str); + if (ret != 0) return(ret); + ret = rfc3986_parse_path_ab_empty(uri, &str); + if (ret != 0) return(ret); + } else if (*str == '/') { + ret = rfc3986_parse_path_absolute(uri, &str); + if (ret != 0) return(ret); + } else if (ISA_PCHAR(str)) { + ret = rfc3986_parse_path_no_scheme(uri, &str); + if (ret != 0) return(ret); + } else { + /* path-empty is effectively empty */ + if (uri != NULL) { + if (uri->path != NULL) g_free(uri->path); + uri->path = NULL; + } + } + + if (*str == '?') { + str++; + ret = rfc3986_parse_query(uri, &str); + if (ret != 0) return(ret); + } + if (*str == '#') { + str++; + ret = rfc3986_parse_fragment(uri, &str); + if (ret != 0) return(ret); + } + if (*str != 0) { + uri_clean(uri); + return(1); + } + return(0); +} + + +/** + * rfc3986_parse: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI string and fills in the appropriate fields + * of the @uri structure + * + * scheme ":" hier-part [ "?" query ] [ "#" fragment ] + * + * Returns 0 or the error code + */ +static int +rfc3986_parse(URI *uri, const char *str) { + int ret; + + ret = rfc3986_parse_scheme(uri, &str); + if (ret != 0) return(ret); + if (*str != ':') { + return(1); + } + str++; + ret = rfc3986_parse_hier_part(uri, &str); + if (ret != 0) return(ret); + if (*str == '?') { + str++; + ret = rfc3986_parse_query(uri, &str); + if (ret != 0) return(ret); + } + if (*str == '#') { + str++; + ret = rfc3986_parse_fragment(uri, &str); + if (ret != 0) return(ret); + } + if (*str != 0) { + uri_clean(uri); + return(1); + } + return(0); +} + +/** + * rfc3986_parse_uri_reference: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI reference string and fills in the appropriate fields + * of the @uri structure + * + * URI-reference = URI / relative-ref + * + * Returns 0 or the error code + */ +static int +rfc3986_parse_uri_reference(URI *uri, const char *str) { + int ret; + + if (str == NULL) + return(-1); + uri_clean(uri); + + /* + * Try first to parse absolute refs, then fallback to relative if + * it fails. + */ + ret = rfc3986_parse(uri, str); + if (ret != 0) { + uri_clean(uri); + ret = rfc3986_parse_relative_ref(uri, str); + if (ret != 0) { + uri_clean(uri); + return(ret); + } + } + return(0); +} + +/** + * uri_parse: + * @str: the URI string to analyze + * + * Parse an URI based on RFC 3986 + * + * URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ] + * + * Returns a newly built URI or NULL in case of error + */ +URI * +uri_parse(const char *str) { + URI *uri; + int ret; + + if (str == NULL) + return(NULL); + uri = uri_new(); + if (uri != NULL) { + ret = rfc3986_parse_uri_reference(uri, str); + if (ret) { + uri_free(uri); + return(NULL); + } + } + return(uri); +} + +/** + * uri_parse_into: + * @uri: pointer to an URI structure + * @str: the string to analyze + * + * Parse an URI reference string based on RFC 3986 and fills in the + * appropriate fields of the @uri structure + * + * URI-reference = URI / relative-ref + * + * Returns 0 or the error code + */ +int +uri_parse_into(URI *uri, const char *str) { + return(rfc3986_parse_uri_reference(uri, str)); +} + +/** + * uri_parse_raw: + * @str: the URI string to analyze + * @raw: if 1 unescaping of URI pieces are disabled + * + * Parse an URI but allows to keep intact the original fragments. + * + * URI-reference = URI / relative-ref + * + * Returns a newly built URI or NULL in case of error + */ +URI * +uri_parse_raw(const char *str, int raw) { + URI *uri; + int ret; + + if (str == NULL) + return(NULL); + uri = uri_new(); + if (uri != NULL) { + if (raw) { + uri->cleanup |= 2; + } + ret = uri_parse_into(uri, str); + if (ret) { + uri_free(uri); + return(NULL); + } + } + return(uri); +} + +/************************************************************************ + * * + * Generic URI structure functions * + * * + ************************************************************************/ + +/** + * uri_new: + * + * Simply creates an empty URI + * + * Returns the new structure or NULL in case of error + */ +URI * +uri_new(void) { + URI *ret; + + ret = (URI *) g_malloc(sizeof(URI)); + memset(ret, 0, sizeof(URI)); + return(ret); +} + +/** + * realloc2n: + * + * Function to handle properly a reallocation when saving an URI + * Also imposes some limit on the length of an URI string output + */ +static char * +realloc2n(char *ret, int *max) { + char *temp; + int tmp; + + tmp = *max * 2; + temp = g_realloc(ret, (tmp + 1)); + *max = tmp; + return(temp); +} + +/** + * uri_to_string: + * @uri: pointer to an URI + * + * Save the URI as an escaped string + * + * Returns a new string (to be deallocated by caller) + */ +char * +uri_to_string(URI *uri) { + char *ret = NULL; + char *temp; + const char *p; + int len; + int max; + + if (uri == NULL) return(NULL); + + + max = 80; + ret = g_malloc(max + 1); + len = 0; + + if (uri->scheme != NULL) { + p = uri->scheme; + while (*p != 0) { + if (len >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + } + if (len >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = ':'; + } + if (uri->opaque != NULL) { + p = uri->opaque; + while (*p != 0) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if (IS_RESERVED(*(p)) || IS_UNRESERVED(*(p))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } else { + if (uri->server != NULL) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '/'; + ret[len++] = '/'; + if (uri->user != NULL) { + p = uri->user; + while (*p != 0) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || + ((*(p) == ';')) || ((*(p) == ':')) || + ((*(p) == '&')) || ((*(p) == '=')) || + ((*(p) == '+')) || ((*(p) == '$')) || + ((*(p) == ','))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '@'; + } + p = uri->server; + while (*p != 0) { + if (len >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + } + if (uri->port > 0) { + if (len + 10 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + len += snprintf(&ret[len], max - len, ":%d", uri->port); + } + } else if (uri->authority != NULL) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '/'; + ret[len++] = '/'; + p = uri->authority; + while (*p != 0) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || + ((*(p) == '$')) || ((*(p) == ',')) || ((*(p) == ';')) || + ((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) || + ((*(p) == '=')) || ((*(p) == '+'))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } else if (uri->scheme != NULL) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '/'; + ret[len++] = '/'; + } + if (uri->path != NULL) { + p = uri->path; + /* + * the colon in file:///d: should not be escaped or + * Windows accesses fail later. + */ + if ((uri->scheme != NULL) && + (p[0] == '/') && + (((p[1] >= 'a') && (p[1] <= 'z')) || + ((p[1] >= 'A') && (p[1] <= 'Z'))) && + (p[2] == ':') && + (!strcmp(uri->scheme, "file"))) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + ret[len++] = *p++; + ret[len++] = *p++; + } + while (*p != 0) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || ((*(p) == '/')) || + ((*(p) == ';')) || ((*(p) == '@')) || ((*(p) == '&')) || + ((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) || + ((*(p) == ','))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } + if (uri->query != NULL) { + if (len + 1 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '?'; + p = uri->query; + while (*p != 0) { + if (len + 1 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = *p++; + } + } + } + if (uri->fragment != NULL) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len++] = '#'; + p = uri->fragment; + while (*p != 0) { + if (len + 3 >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + if ((IS_UNRESERVED(*(p))) || (IS_RESERVED(*(p)))) + ret[len++] = *p++; + else { + int val = *(unsigned char *)p++; + int hi = val / 0x10, lo = val % 0x10; + ret[len++] = '%'; + ret[len++] = hi + (hi > 9? 'A'-10 : '0'); + ret[len++] = lo + (lo > 9? 'A'-10 : '0'); + } + } + } + if (len >= max) { + temp = realloc2n(ret, &max); + if (temp == NULL) goto mem_error; + ret = temp; + } + ret[len] = 0; + return(ret); + +mem_error: + g_free(ret); + return(NULL); +} + +/** + * uri_clean: + * @uri: pointer to an URI + * + * Make sure the URI struct is free of content + */ +static void +uri_clean(URI *uri) { + if (uri == NULL) return; + + if (uri->scheme != NULL) g_free(uri->scheme); + uri->scheme = NULL; + if (uri->server != NULL) g_free(uri->server); + uri->server = NULL; + if (uri->user != NULL) g_free(uri->user); + uri->user = NULL; + if (uri->path != NULL) g_free(uri->path); + uri->path = NULL; + if (uri->fragment != NULL) g_free(uri->fragment); + uri->fragment = NULL; + if (uri->opaque != NULL) g_free(uri->opaque); + uri->opaque = NULL; + if (uri->authority != NULL) g_free(uri->authority); + uri->authority = NULL; + if (uri->query != NULL) g_free(uri->query); + uri->query = NULL; +} + +/** + * uri_free: + * @uri: pointer to an URI + * + * Free up the URI struct + */ +void +uri_free(URI *uri) { + uri_clean(uri); + g_free(uri); +} + +/************************************************************************ + * * + * Helper functions * + * * + ************************************************************************/ + +/** + * normalize_uri_path: + * @path: pointer to the path string + * + * Applies the 5 normalization steps to a path string--that is, RFC 2396 + * Section 5.2, steps 6.c through 6.g. + * + * Normalization occurs directly on the string, no new allocation is done + * + * Returns 0 or an error code + */ +static int +normalize_uri_path(char *path) { + char *cur, *out; + + if (path == NULL) + return(-1); + + /* Skip all initial "/" chars. We want to get to the beginning of the + * first non-empty segment. + */ + cur = path; + while (cur[0] == '/') + ++cur; + if (cur[0] == '\0') + return(0); + + /* Keep everything we've seen so far. */ + out = cur; + + /* + * Analyze each segment in sequence for cases (c) and (d). + */ + while (cur[0] != '\0') { + /* + * c) All occurrences of "./", where "." is a complete path segment, + * are removed from the buffer string. + */ + if ((cur[0] == '.') && (cur[1] == '/')) { + cur += 2; + /* '//' normalization should be done at this point too */ + while (cur[0] == '/') + cur++; + continue; + } + + /* + * d) If the buffer string ends with "." as a complete path segment, + * that "." is removed. + */ + if ((cur[0] == '.') && (cur[1] == '\0')) + break; + + /* Otherwise keep the segment. */ + while (cur[0] != '/') { + if (cur[0] == '\0') + goto done_cd; + (out++)[0] = (cur++)[0]; + } + /* nomalize // */ + while ((cur[0] == '/') && (cur[1] == '/')) + cur++; + + (out++)[0] = (cur++)[0]; + } + done_cd: + out[0] = '\0'; + + /* Reset to the beginning of the first segment for the next sequence. */ + cur = path; + while (cur[0] == '/') + ++cur; + if (cur[0] == '\0') + return(0); + + /* + * Analyze each segment in sequence for cases (e) and (f). + * + * e) All occurrences of "<segment>/../", where <segment> is a + * complete path segment not equal to "..", are removed from the + * buffer string. Removal of these path segments is performed + * iteratively, removing the leftmost matching pattern on each + * iteration, until no matching pattern remains. + * + * f) If the buffer string ends with "<segment>/..", where <segment> + * is a complete path segment not equal to "..", that + * "<segment>/.." is removed. + * + * To satisfy the "iterative" clause in (e), we need to collapse the + * string every time we find something that needs to be removed. Thus, + * we don't need to keep two pointers into the string: we only need a + * "current position" pointer. + */ + while (1) { + char *segp, *tmp; + + /* At the beginning of each iteration of this loop, "cur" points to + * the first character of the segment we want to examine. + */ + + /* Find the end of the current segment. */ + segp = cur; + while ((segp[0] != '/') && (segp[0] != '\0')) + ++segp; + + /* If this is the last segment, we're done (we need at least two + * segments to meet the criteria for the (e) and (f) cases). + */ + if (segp[0] == '\0') + break; + + /* If the first segment is "..", or if the next segment _isn't_ "..", + * keep this segment and try the next one. + */ + ++segp; + if (((cur[0] == '.') && (cur[1] == '.') && (segp == cur+3)) + || ((segp[0] != '.') || (segp[1] != '.') + || ((segp[2] != '/') && (segp[2] != '\0')))) { + cur = segp; + continue; + } + + /* If we get here, remove this segment and the next one and back up + * to the previous segment (if there is one), to implement the + * "iteratively" clause. It's pretty much impossible to back up + * while maintaining two pointers into the buffer, so just compact + * the whole buffer now. + */ + + /* If this is the end of the buffer, we're done. */ + if (segp[2] == '\0') { + cur[0] = '\0'; + break; + } + /* Valgrind complained, strcpy(cur, segp + 3); */ + /* string will overlap, do not use strcpy */ + tmp = cur; + segp += 3; + while ((*tmp++ = *segp++) != 0) + ; + + /* If there are no previous segments, then keep going from here. */ + segp = cur; + while ((segp > path) && ((--segp)[0] == '/')) + ; + if (segp == path) + continue; + + /* "segp" is pointing to the end of a previous segment; find it's + * start. We need to back up to the previous segment and start + * over with that to handle things like "foo/bar/../..". If we + * don't do this, then on the first pass we'll remove the "bar/..", + * but be pointing at the second ".." so we won't realize we can also + * remove the "foo/..". + */ + cur = segp; + while ((cur > path) && (cur[-1] != '/')) + --cur; + } + out[0] = '\0'; + + /* + * g) If the resulting buffer string still begins with one or more + * complete path segments of "..", then the reference is + * considered to be in error. Implementations may handle this + * error by retaining these components in the resolved path (i.e., + * treating them as part of the final URI), by removing them from + * the resolved path (i.e., discarding relative levels above the + * root), or by avoiding traversal of the reference. + * + * We discard them from the final path. + */ + if (path[0] == '/') { + cur = path; + while ((cur[0] == '/') && (cur[1] == '.') && (cur[2] == '.') + && ((cur[3] == '/') || (cur[3] == '\0'))) + cur += 3; + + if (cur != path) { + out = path; + while (cur[0] != '\0') + (out++)[0] = (cur++)[0]; + out[0] = 0; + } + } + + return(0); +} + +static int is_hex(char c) { + if (((c >= '0') && (c <= '9')) || + ((c >= 'a') && (c <= 'f')) || + ((c >= 'A') && (c <= 'F'))) + return(1); + return(0); +} + + +/** + * uri_string_unescape: + * @str: the string to unescape + * @len: the length in bytes to unescape (or <= 0 to indicate full string) + * @target: optional destination buffer + * + * Unescaping routine, but does not check that the string is an URI. The + * output is a direct unsigned char translation of %XX values (no encoding) + * Note that the length of the result can only be smaller or same size as + * the input string. + * + * Returns a copy of the string, but unescaped, will return NULL only in case + * of error + */ +char * +uri_string_unescape(const char *str, int len, char *target) { + char *ret, *out; + const char *in; + + if (str == NULL) + return(NULL); + if (len <= 0) len = strlen(str); + if (len < 0) return(NULL); + + if (target == NULL) { + ret = g_malloc(len + 1); + } else + ret = target; + in = str; + out = ret; + while(len > 0) { + if ((len > 2) && (*in == '%') && (is_hex(in[1])) && (is_hex(in[2]))) { + in++; + if ((*in >= '0') && (*in <= '9')) + *out = (*in - '0'); + else if ((*in >= 'a') && (*in <= 'f')) + *out = (*in - 'a') + 10; + else if ((*in >= 'A') && (*in <= 'F')) + *out = (*in - 'A') + 10; + in++; + if ((*in >= '0') && (*in <= '9')) + *out = *out * 16 + (*in - '0'); + else if ((*in >= 'a') && (*in <= 'f')) + *out = *out * 16 + (*in - 'a') + 10; + else if ((*in >= 'A') && (*in <= 'F')) + *out = *out * 16 + (*in - 'A') + 10; + in++; + len -= 3; + out++; + } else { + *out++ = *in++; + len--; + } + } + *out = 0; + return(ret); +} + +/** + * uri_string_escape: + * @str: string to escape + * @list: exception list string of chars not to escape + * + * This routine escapes a string to hex, ignoring reserved characters (a-z) + * and the characters in the exception list. + * + * Returns a new escaped string or NULL in case of error. + */ +char * +uri_string_escape(const char *str, const char *list) { + char *ret, ch; + char *temp; + const char *in; + int len, out; + + if (str == NULL) + return(NULL); + if (str[0] == 0) + return(g_strdup(str)); + len = strlen(str); + if (!(len > 0)) return(NULL); + + len += 20; + ret = g_malloc(len); + in = str; + out = 0; + while(*in != 0) { + if (len - out <= 3) { + temp = realloc2n(ret, &len); + ret = temp; + } + + ch = *in; + + if ((ch != '@') && (!IS_UNRESERVED(ch)) && (!strchr(list, ch))) { + unsigned char val; + ret[out++] = '%'; + val = ch >> 4; + if (val <= 9) + ret[out++] = '0' + val; + else + ret[out++] = 'A' + val - 0xA; + val = ch & 0xF; + if (val <= 9) + ret[out++] = '0' + val; + else + ret[out++] = 'A' + val - 0xA; + in++; + } else { + ret[out++] = *in++; + } + + } + ret[out] = 0; + return(ret); +} + +/************************************************************************ + * * + * Public functions * + * * + ************************************************************************/ + +/** + * uri_resolve: + * @URI: the URI instance found in the document + * @base: the base value + * + * Computes he final URI of the reference done by checking that + * the given URI is valid, and building the final URI using the + * base URI. This is processed according to section 5.2 of the + * RFC 2396 + * + * 5.2. Resolving Relative References to Absolute Form + * + * Returns a new URI string (to be freed by the caller) or NULL in case + * of error. + */ +char * +uri_resolve(const char *uri, const char *base) { + char *val = NULL; + int ret, len, indx, cur, out; + URI *ref = NULL; + URI *bas = NULL; + URI *res = NULL; + + /* + * 1) The URI reference is parsed into the potential four components and + * fragment identifier, as described in Section 4.3. + * + * NOTE that a completely empty URI is treated by modern browsers + * as a reference to "." rather than as a synonym for the current + * URI. Should we do that here? + */ + if (uri == NULL) + ret = -1; + else { + if (*uri) { + ref = uri_new(); + if (ref == NULL) + goto done; + ret = uri_parse_into(ref, uri); + } + else + ret = 0; + } + if (ret != 0) + goto done; + if ((ref != NULL) && (ref->scheme != NULL)) { + /* + * The URI is absolute don't modify. + */ + val = g_strdup(uri); + goto done; + } + if (base == NULL) + ret = -1; + else { + bas = uri_new(); + if (bas == NULL) + goto done; + ret = uri_parse_into(bas, base); + } + if (ret != 0) { + if (ref) + val = uri_to_string(ref); + goto done; + } + if (ref == NULL) { + /* + * the base fragment must be ignored + */ + if (bas->fragment != NULL) { + g_free(bas->fragment); + bas->fragment = NULL; + } + val = uri_to_string(bas); + goto done; + } + + /* + * 2) If the path component is empty and the scheme, authority, and + * query components are undefined, then it is a reference to the + * current document and we are done. Otherwise, the reference URI's + * query and fragment components are defined as found (or not found) + * within the URI reference and not inherited from the base URI. + * + * NOTE that in modern browsers, the parsing differs from the above + * in the following aspect: the query component is allowed to be + * defined while still treating this as a reference to the current + * document. + */ + res = uri_new(); + if (res == NULL) + goto done; + if ((ref->scheme == NULL) && (ref->path == NULL) && + ((ref->authority == NULL) && (ref->server == NULL))) { + if (bas->scheme != NULL) + res->scheme = g_strdup(bas->scheme); + if (bas->authority != NULL) + res->authority = g_strdup(bas->authority); + else if (bas->server != NULL) { + res->server = g_strdup(bas->server); + if (bas->user != NULL) + res->user = g_strdup(bas->user); + res->port = bas->port; + } + if (bas->path != NULL) + res->path = g_strdup(bas->path); + if (ref->query != NULL) + res->query = g_strdup (ref->query); + else if (bas->query != NULL) + res->query = g_strdup(bas->query); + if (ref->fragment != NULL) + res->fragment = g_strdup(ref->fragment); + goto step_7; + } + + /* + * 3) If the scheme component is defined, indicating that the reference + * starts with a scheme name, then the reference is interpreted as an + * absolute URI and we are done. Otherwise, the reference URI's + * scheme is inherited from the base URI's scheme component. + */ + if (ref->scheme != NULL) { + val = uri_to_string(ref); + goto done; + } + if (bas->scheme != NULL) + res->scheme = g_strdup(bas->scheme); + + if (ref->query != NULL) + res->query = g_strdup(ref->query); + if (ref->fragment != NULL) + res->fragment = g_strdup(ref->fragment); + + /* + * 4) If the authority component is defined, then the reference is a + * network-path and we skip to step 7. Otherwise, the reference + * URI's authority is inherited from the base URI's authority + * component, which will also be undefined if the URI scheme does not + * use an authority component. + */ + if ((ref->authority != NULL) || (ref->server != NULL)) { + if (ref->authority != NULL) + res->authority = g_strdup(ref->authority); + else { + res->server = g_strdup(ref->server); + if (ref->user != NULL) + res->user = g_strdup(ref->user); + res->port = ref->port; + } + if (ref->path != NULL) + res->path = g_strdup(ref->path); + goto step_7; + } + if (bas->authority != NULL) + res->authority = g_strdup(bas->authority); + else if (bas->server != NULL) { + res->server = g_strdup(bas->server); + if (bas->user != NULL) + res->user = g_strdup(bas->user); + res->port = bas->port; + } + + /* + * 5) If the path component begins with a slash character ("/"), then + * the reference is an absolute-path and we skip to step 7. + */ + if ((ref->path != NULL) && (ref->path[0] == '/')) { + res->path = g_strdup(ref->path); + goto step_7; + } + + + /* + * 6) If this step is reached, then we are resolving a relative-path + * reference. The relative path needs to be merged with the base + * URI's path. Although there are many ways to do this, we will + * describe a simple method using a separate string buffer. + * + * Allocate a buffer large enough for the result string. + */ + len = 2; /* extra / and 0 */ + if (ref->path != NULL) + len += strlen(ref->path); + if (bas->path != NULL) + len += strlen(bas->path); + res->path = g_malloc(len); + res->path[0] = 0; + + /* + * a) All but the last segment of the base URI's path component is + * copied to the buffer. In other words, any characters after the + * last (right-most) slash character, if any, are excluded. + */ + cur = 0; + out = 0; + if (bas->path != NULL) { + while (bas->path[cur] != 0) { + while ((bas->path[cur] != 0) && (bas->path[cur] != '/')) + cur++; + if (bas->path[cur] == 0) + break; + + cur++; + while (out < cur) { + res->path[out] = bas->path[out]; + out++; + } + } + } + res->path[out] = 0; + + /* + * b) The reference's path component is appended to the buffer + * string. + */ + if (ref->path != NULL && ref->path[0] != 0) { + indx = 0; + /* + * Ensure the path includes a '/' + */ + if ((out == 0) && (bas->server != NULL)) + res->path[out++] = '/'; + while (ref->path[indx] != 0) { + res->path[out++] = ref->path[indx++]; + } + } + res->path[out] = 0; + + /* + * Steps c) to h) are really path normalization steps + */ + normalize_uri_path(res->path); + +step_7: + + /* + * 7) The resulting URI components, including any inherited from the + * base URI, are recombined to give the absolute form of the URI + * reference. + */ + val = uri_to_string(res); + +done: + if (ref != NULL) + uri_free(ref); + if (bas != NULL) + uri_free(bas); + if (res != NULL) + uri_free(res); + return(val); +} + +/** + * uri_resolve_relative: + * @URI: the URI reference under consideration + * @base: the base value + * + * Expresses the URI of the reference in terms relative to the + * base. Some examples of this operation include: + * base = "http://site1.com/docs/book1.html" + * URI input URI returned + * docs/pic1.gif pic1.gif + * docs/img/pic1.gif img/pic1.gif + * img/pic1.gif ../img/pic1.gif + * http://site1.com/docs/pic1.gif pic1.gif + * http://site2.com/docs/pic1.gif http://site2.com/docs/pic1.gif + * + * base = "docs/book1.html" + * URI input URI returned + * docs/pic1.gif pic1.gif + * docs/img/pic1.gif img/pic1.gif + * img/pic1.gif ../img/pic1.gif + * http://site1.com/docs/pic1.gif http://site1.com/docs/pic1.gif + * + * + * Note: if the URI reference is really weird or complicated, it may be + * worthwhile to first convert it into a "nice" one by calling + * uri_resolve (using 'base') before calling this routine, + * since this routine (for reasonable efficiency) assumes URI has + * already been through some validation. + * + * Returns a new URI string (to be freed by the caller) or NULL in case + * error. + */ +char * +uri_resolve_relative (const char *uri, const char * base) +{ + char *val = NULL; + int ret; + int ix; + int pos = 0; + int nbslash = 0; + int len; + URI *ref = NULL; + URI *bas = NULL; + char *bptr, *uptr, *vptr; + int remove_path = 0; + + if ((uri == NULL) || (*uri == 0)) + return NULL; + + /* + * First parse URI into a standard form + */ + ref = uri_new (); + if (ref == NULL) + return NULL; + /* If URI not already in "relative" form */ + if (uri[0] != '.') { + ret = uri_parse_into (ref, uri); + if (ret != 0) + goto done; /* Error in URI, return NULL */ + } else + ref->path = g_strdup(uri); + + /* + * Next parse base into the same standard form + */ + if ((base == NULL) || (*base == 0)) { + val = g_strdup (uri); + goto done; + } + bas = uri_new (); + if (bas == NULL) + goto done; + if (base[0] != '.') { + ret = uri_parse_into (bas, base); + if (ret != 0) + goto done; /* Error in base, return NULL */ + } else + bas->path = g_strdup(base); + + /* + * If the scheme / server on the URI differs from the base, + * just return the URI + */ + if ((ref->scheme != NULL) && + ((bas->scheme == NULL) || + (strcmp (bas->scheme, ref->scheme)) || + (strcmp (bas->server, ref->server)))) { + val = g_strdup (uri); + goto done; + } + if (!strcmp(bas->path, ref->path)) { + val = g_strdup(""); + goto done; + } + if (bas->path == NULL) { + val = g_strdup(ref->path); + goto done; + } + if (ref->path == NULL) { + ref->path = (char *) "/"; + remove_path = 1; + } + + /* + * At this point (at last!) we can compare the two paths + * + * First we take care of the special case where either of the + * two path components may be missing (bug 316224) + */ + if (bas->path == NULL) { + if (ref->path != NULL) { + uptr = ref->path; + if (*uptr == '/') + uptr++; + /* exception characters from uri_to_string */ + val = uri_string_escape(uptr, "/;&=+$,"); + } + goto done; + } + bptr = bas->path; + if (ref->path == NULL) { + for (ix = 0; bptr[ix] != 0; ix++) { + if (bptr[ix] == '/') + nbslash++; + } + uptr = NULL; + len = 1; /* this is for a string terminator only */ + } else { + /* + * Next we compare the two strings and find where they first differ + */ + if ((ref->path[pos] == '.') && (ref->path[pos+1] == '/')) + pos += 2; + if ((*bptr == '.') && (bptr[1] == '/')) + bptr += 2; + else if ((*bptr == '/') && (ref->path[pos] != '/')) + bptr++; + while ((bptr[pos] == ref->path[pos]) && (bptr[pos] != 0)) + pos++; + + if (bptr[pos] == ref->path[pos]) { + val = g_strdup(""); + goto done; /* (I can't imagine why anyone would do this) */ + } + + /* + * In URI, "back up" to the last '/' encountered. This will be the + * beginning of the "unique" suffix of URI + */ + ix = pos; + if ((ref->path[ix] == '/') && (ix > 0)) + ix--; + else if ((ref->path[ix] == 0) && (ix > 1) && (ref->path[ix - 1] == '/')) + ix -= 2; + for (; ix > 0; ix--) { + if (ref->path[ix] == '/') + break; + } + if (ix == 0) { + uptr = ref->path; + } else { + ix++; + uptr = &ref->path[ix]; + } + + /* + * In base, count the number of '/' from the differing point + */ + if (bptr[pos] != ref->path[pos]) {/* check for trivial URI == base */ + for (; bptr[ix] != 0; ix++) { + if (bptr[ix] == '/') + nbslash++; + } + } + len = strlen (uptr) + 1; + } + + if (nbslash == 0) { + if (uptr != NULL) + /* exception characters from uri_to_string */ + val = uri_string_escape(uptr, "/;&=+$,"); + goto done; + } + + /* + * Allocate just enough space for the returned string - + * length of the remainder of the URI, plus enough space + * for the "../" groups, plus one for the terminator + */ + val = g_malloc (len + 3 * nbslash); + vptr = val; + /* + * Put in as many "../" as needed + */ + for (; nbslash>0; nbslash--) { + *vptr++ = '.'; + *vptr++ = '.'; + *vptr++ = '/'; + } + /* + * Finish up with the end of the URI + */ + if (uptr != NULL) { + if ((vptr > val) && (len > 0) && + (uptr[0] == '/') && (vptr[-1] == '/')) { + memcpy (vptr, uptr + 1, len - 1); + vptr[len - 2] = 0; + } else { + memcpy (vptr, uptr, len); + vptr[len - 1] = 0; + } + } else { + vptr[len - 1] = 0; + } + + /* escape the freshly-built path */ + vptr = val; + /* exception characters from uri_to_string */ + val = uri_string_escape(vptr, "/;&=+$,"); + g_free(vptr); + +done: + /* + * Free the working variables + */ + if (remove_path != 0) + ref->path = NULL; + if (ref != NULL) + uri_free (ref); + if (bas != NULL) + uri_free (bas); + + return val; +} + +/* + * Utility functions to help parse and assemble query strings. + */ + +struct QueryParams * +query_params_new (int init_alloc) +{ + struct QueryParams *ps; + + if (init_alloc <= 0) init_alloc = 1; + + ps = g_new(QueryParams, 1); + ps->n = 0; + ps->alloc = init_alloc; + ps->p = g_new(QueryParam, ps->alloc); + + return ps; +} + +/* Ensure there is space to store at least one more parameter + * at the end of the set. + */ +static int +query_params_append (struct QueryParams *ps, + const char *name, const char *value) +{ + if (ps->n >= ps->alloc) { + ps->p = g_renew(QueryParam, ps->p, ps->alloc * 2); + ps->alloc *= 2; + } + + ps->p[ps->n].name = g_strdup(name); + ps->p[ps->n].value = value ? g_strdup(value) : NULL; + ps->p[ps->n].ignore = 0; + ps->n++; + + return 0; +} + +void +query_params_free (struct QueryParams *ps) +{ + int i; + + for (i = 0; i < ps->n; ++i) { + g_free (ps->p[i].name); + g_free (ps->p[i].value); + } + g_free (ps->p); + g_free (ps); +} + +struct QueryParams * +query_params_parse (const char *query) +{ + struct QueryParams *ps; + const char *end, *eq; + + ps = query_params_new (0); + if (!query || query[0] == '\0') return ps; + + while (*query) { + char *name = NULL, *value = NULL; + + /* Find the next separator, or end of the string. */ + end = strchr (query, '&'); + if (!end) + end = strchr (query, ';'); + if (!end) + end = query + strlen (query); + + /* Find the first '=' character between here and end. */ + eq = strchr (query, '='); + if (eq && eq >= end) eq = NULL; + + /* Empty section (eg. "&&"). */ + if (end == query) + goto next; + + /* If there is no '=' character, then we have just "name" + * and consistent with CGI.pm we assume value is "". + */ + else if (!eq) { + name = uri_string_unescape (query, end - query, NULL); + value = NULL; + } + /* Or if we have "name=" here (works around annoying + * problem when calling uri_string_unescape with len = 0). + */ + else if (eq+1 == end) { + name = uri_string_unescape (query, eq - query, NULL); + value = g_new0(char, 1); + } + /* If the '=' character is at the beginning then we have + * "=value" and consistent with CGI.pm we _ignore_ this. + */ + else if (query == eq) + goto next; + + /* Otherwise it's "name=value". */ + else { + name = uri_string_unescape (query, eq - query, NULL); + value = uri_string_unescape (eq+1, end - (eq+1), NULL); + } + + /* Append to the parameter set. */ + query_params_append (ps, name, value); + g_free(name); + g_free(value); + + next: + query = end; + if (*query) query ++; /* skip '&' separator */ + } + + return ps; +} |