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netsurf/utils/url.c
John Mark Bell 50f520379b warnings.squash(); 
svn path=/trunk/netsurf/; revision=4206
2008-05-26 10:34:47 +00:00

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/*
* Copyright 2006 Richard Wilson <info@tinct.net>
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2005 John M Bell <jmb202@ecs.soton.ac.uk>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* URL parsing and joining (implementation).
*/
#include <assert.h>
#include <ctype.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <regex.h>
#include "curl/curl.h"
#include "utils/log.h"
#include "utils/url.h"
#include "utils/utils.h"
struct url_components_internal {
char *buffer; /* buffer used for all the following data */
char *scheme;
char *authority;
char *path;
char *query;
char *fragment;
};
regex_t url_re, url_up_re;
/**
* Initialise URL routines.
*
* Compiles regular expressions required by the url_ functions.
*/
void url_init(void)
{
/* regex from RFC 2396 */
regcomp_wrapper(&url_re, "^[[:space:]]*"
#define URL_RE_SCHEME 2
"(([a-zA-Z][-a-zA-Z0-9+.]*):)?"
#define URL_RE_AUTHORITY 4
"(//([^/?#[:space:]]*))?"
#define URL_RE_PATH 5
"([^?#[:space:]]*)"
#define URL_RE_QUERY 7
"(\\?([^#[:space:]]*))?"
#define URL_RE_FRAGMENT 9
"(#([^[:space:]]*))?"
"[[:space:]]*$", REG_EXTENDED);
regcomp_wrapper(&url_up_re,
"/([^/]?|[.][^./]|[^./][.]|[^./][^./]|[^/][^/][^/]+)"
"/[.][.](/|$)",
REG_EXTENDED);
}
/**
* Check whether a host is an IP address
*
* \param host a hostname terminated by '\0' or '/'
* \return true if the hostname is an IP address, false otherwise
*/
bool url_host_is_ip_address(const char *host) {
int b;
bool n;
assert(host);
/* an IP address is of the format XXX.XXX.XXX.XXX, ie totally
* numeric with 3 full stops between the numbers */
b = 0; // number of breaks
n = false; // number present
do {
if (*host == '.') {
if (!n)
return false;
b++;
n = false;
} else if ((*host == '\0') || (*host == '/')) {
if (!n)
return false;
/* todo: check the values are in 0-255 range */
return (b == 3);
} else if (*host < '0' || *host > '9') {
return false;
} else {
n = true;
}
host++;
} while (1);
}
/**
* Normalize a URL.
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold cleaned up url. Caller
* gets ownership of pointer to buffer value. On failure the
* pointer to buffer value will be NULL.
* \return URL_FUNC_OK on success
*
* If there is no scheme, http:// is added. The scheme and host are
* lower-cased. Default ports are removed (http only). An empty path is
* replaced with "/". Characters are unescaped if safe.
*/
url_func_result url_normalize(const char *url, char **result)
{
char c;
int m;
size_t i;
size_t len;
size_t bufsize;
char* norm;
bool http = false;
regmatch_t match[10];
*result = NULL;
/* skip past any leading whitespace (likely if URL was copy-pasted) */
while (isspace(*url))
url++;
/* allocate sufficiently large buffer for new URL */
len = strlen(url);
/* "+ 1" for the terminating NUL character. */
bufsize = len + 1 + SLEN("http://") + SLEN("/");
/* work out how much extra to leave for internal whitespace */
for(i = 0; i < len; i++) {
if(isspace(url[i])) bufsize += 2; /* ' ' -> '%20' */
}
if ((norm = malloc(bufsize)) == NULL) {
LOG(("malloc failed"));
return URL_FUNC_NOMEM;
}
*result = norm;
strcpy(norm, url);
/* truncate trailing whitespace (significant should be uriencoded) */
for (i = len - 1; (i > 0) && isspace(norm[i]); i--) {
norm[i] = '\0';
len--;
}
/* encode any remaining (internal) whitespace */
for (i = 0; i < len; i++) {
if(isspace(norm[i])) {
char space = norm[i];
memmove(norm + i + 2, norm + i, 1 + len - i);
len += 2;
norm[ i] = '%';
norm[++i] = digit2lowcase_hex(space >> 4);
norm[++i] = digit2lowcase_hex(space & 0xf);
}
}
/* finally verify that it's actually an URL we're working on
* (RFC regex too fussy to tolerate above WSP problems) */
if ((m = regexec(&url_re, norm, 10, match, 0))) {
LOG(("url '%s' failed to match regex", url));
free(norm);
*result = NULL;
return URL_FUNC_FAILED;
}
if (match[URL_RE_SCHEME].rm_so == -1) {
/* scheme missing: add http:// and reparse */
/* LOG(("scheme missing: using http"));*/
memmove(norm + SLEN("http://"), norm, len + 1);
memcpy(norm, "http://", SLEN("http://")); /* do NOT copy NUL */
len += SLEN("http://");
if ((m = regexec(&url_re, norm, 10, match, 0))) {
LOG(("url '%s' failed to match regex", norm));
free(norm);
*result = NULL;
return URL_FUNC_FAILED;
}
}
/*for (unsigned int i = 0; i != 10; i++) {
if (match[i].rm_so == -1)
continue;
fprintf(stderr, "%i: '%.*s'\n", i,
match[i].rm_eo - match[i].rm_so,
res + match[i].rm_so);
}*/
/* see RFC 2616 section 3.2.3 */
/* make scheme lower-case */
if (match[URL_RE_SCHEME].rm_so != -1) {
for (i = match[URL_RE_SCHEME].rm_so;
(regoff_t) i != match[URL_RE_SCHEME].rm_eo; i++)
norm[i] = tolower(norm[i]);
if (match[URL_RE_SCHEME].rm_eo == 4
&& norm[0] == 'h'
&& norm[1] == 't'
&& norm[2] == 't'
&& norm[3] == 'p')
http = true;
}
/* make empty path into "/" */
if (match[URL_RE_PATH].rm_so != -1 &&
match[URL_RE_PATH].rm_so == match[URL_RE_PATH].rm_eo) {
memmove(norm + match[URL_RE_PATH].rm_so + 1,
norm + match[URL_RE_PATH].rm_so,
len - match[URL_RE_PATH].rm_so + 1);
norm[match[URL_RE_PATH].rm_so] = '/';
len++;
}
/* make host lower-case */
if (match[URL_RE_AUTHORITY].rm_so != -1) {
for (i = match[URL_RE_AUTHORITY].rm_so;
(regoff_t) i != match[URL_RE_AUTHORITY].rm_eo;
i++) {
if (norm[i] == ':' && (i + 3) < len) {
if (http && norm[i + 1] == '8' &&
norm[i + 2] == '0' &&
(regoff_t) i + 3 ==
match[URL_RE_AUTHORITY].rm_eo) {
memmove(norm + i,
norm + i + 3,
len -
match[URL_RE_AUTHORITY].
rm_eo);
len -= 3;
norm[len] = '\0';
} else if ((regoff_t) i + 1 == match[4].rm_eo) {
memmove(norm + i,
norm + i + 1,
len -
match[URL_RE_AUTHORITY].
rm_eo);
len--;
norm[len] = '\0';
}
break;
}
norm[i] = tolower(norm[i]);
}
}
/* unescape non-"reserved" escaped characters */
for (i = 0; i + 2 < len; i++) {
if (norm[i] != '%')
continue;
c = tolower(norm[i + 1]);
if ('0' <= c && c <= '9')
m = 16 * (c - '0');
else if ('a' <= c && c <= 'f')
m = 16 * (c - 'a' + 10);
else
continue;
c = tolower(norm[i + 2]);
if ('0' <= c && c <= '9')
m += c - '0';
else if ('a' <= c && c <= 'f')
m += c - 'a' + 10;
else
continue;
if (m <= 0x20 || strchr(";/?:@&=+$," "<>#%\"{}|\\^[]`", m) ||
m >= 0x7f) {
i += 2;
continue;
}
norm[i] = m;
memmove(norm + i + 1, norm + i + 3, len - i - 2);
len -= 2;
}
/* norm and *result point to same memory, so just return ok */
return URL_FUNC_OK;
}
/**
* Resolve a relative URL to absolute form.
*
* \param rel relative URL
* \param base base URL, must be absolute and cleaned as by url_normalize()
* \param result pointer to pointer to buffer to hold absolute url
* \return URL_FUNC_OK on success
*/
url_func_result url_join(const char *rel, const char *base, char **result)
{
url_func_result status = URL_FUNC_NOMEM;
struct url_components_internal base_components = {0,0,0,0,0,0};
struct url_components_internal rel_components = {0,0,0,0,0,0};
struct url_components_internal merged_components = {0,0,0,0,0,0};
char *merge_path = NULL, *split_point;
char *input, *output, *start = NULL;
int len, buf_len;
(*result) = 0;
assert(base);
assert(rel);
/* break down the relative URL (not cached, corruptable) */
status = url_get_components(rel,
(struct url_components *)&rel_components);
if (status != URL_FUNC_OK) {
LOG(("relative url '%s' failed to get components", rel));
return URL_FUNC_FAILED;
}
/* [1] relative URL is absolute, use it entirely */
merged_components = rel_components;
if (rel_components.scheme)
goto url_join_reform_url;
/* break down the base URL (possibly cached, not corruptable) */
status = url_get_components(base,
(struct url_components *)&base_components);
if (status != URL_FUNC_OK) {
url_destroy_components(
(struct url_components *)&rel_components);
LOG(("base url '%s' failed to get components", base));
return URL_FUNC_FAILED;
}
/* [2] relative authority takes presidence */
merged_components.scheme = base_components.scheme;
if (rel_components.authority)
goto url_join_reform_url;
/* [3] handle empty paths */
merged_components.authority = base_components.authority;
if (!rel_components.path) {
merged_components.path = base_components.path;
if (!rel_components.query)
merged_components.query = base_components.query;
goto url_join_reform_url;
}
/* [4] handle valid paths */
if (rel_components.path[0] == '/')
merged_components.path = rel_components.path;
else {
/* 5.2.3 */
if ((base_components.authority) && (!base_components.path)) {
merge_path = malloc(strlen(rel_components.path) + 2);
if (!merge_path) {
LOG(("malloc failed"));
goto url_join_no_mem;
}
sprintf(merge_path, "/%s", rel_components.path);
merged_components.path = merge_path;
} else {
split_point = base_components.path ?
strrchr(base_components.path, '/') :
NULL;
if (!split_point) {
merged_components.path = rel_components.path;
} else {
len = ++split_point - base_components.path;
buf_len = len + 1 + strlen(rel_components.path);
merge_path = malloc(buf_len);
if (!merge_path) {
LOG(("malloc failed"));
goto url_join_no_mem;
}
memcpy(merge_path, base_components.path, len);
memcpy(merge_path + len, rel_components.path,
strlen(rel_components.path));
merge_path[buf_len - 1] = '\0';
merged_components.path = merge_path;
}
}
}
url_join_reform_url:
/* 5.2.4 */
input = merged_components.path;
if ((input) && (strchr(input, '.'))) {
/* [1] remove all dot references */
output = start = malloc(strlen(input) + 1);
if (!output) {
LOG(("malloc failed"));
goto url_join_no_mem;
}
merged_components.path = output;
*output = '\0';
while (*input != '\0') {
/* [2A] */
if (input[0] == '.') {
if (input[1] == '/') {
input = input + 2;
continue;
} else if ((input[1] == '.') &&
(input[2] == '/')) {
input = input + 3;
continue;
}
}
/* [2B] */
if ((input[0] == '/') && (input[1] == '.')) {
if (input[2] == '/') {
input = input + 2;
continue;
} else if (input[2] == '\0') {
input = input + 1;
*input = '/';
continue;
}
/* [2C] */
if ((input[2] == '.') && ((input[3] == '/') ||
(input[3] == '\0'))) {
if (input[3] == '/') {
input = input + 3;
} else {
input = input + 2;
*input = '/';
}
if ((output > start) &&
(output[-1] == '/'))
*--output = '\0';
split_point = strrchr(start, '/');
if (!split_point)
output = start;
else
output = split_point;
*output = '\0';
continue;
}
}
/* [2D] */
if (input[0] == '.') {
if (input[1] == '\0') {
input = input + 1;
continue;
} else if ((input[1] == '.') &&
(input[2] == '\0')) {
input = input + 2;
continue;
}
}
/* [2E] */
if (*input == '/')
*output++ = *input++;
while ((*input != '/') && (*input != '\0'))
*output++ = *input++;
*output = '\0';
}
/* [3] */
merged_components.path = start;
}
/* 5.3 */
*result = url_reform_components(
(struct url_components *)&merged_components);
if (!(*result))
goto url_join_no_mem;
/* return success */
status = URL_FUNC_OK;
url_join_no_mem:
free(start);
free(merge_path);
url_destroy_components((struct url_components *)&base_components);
url_destroy_components((struct url_components *)&rel_components);
return status;
}
/**
* Return the host name from an URL.
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold host name
* \return URL_FUNC_OK on success
*/
url_func_result url_host(const char *url, char **result)
{
url_func_result status;
struct url_components components;
const char *host_start, *host_end;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if (!components.authority) {
url_destroy_components(&components);
return URL_FUNC_FAILED;
}
host_start = strchr(components.authority, '@');
host_start = host_start ? host_start + 1 : components.authority;
host_end = strchr(host_start, ':');
if (!host_end)
host_end = components.authority +
strlen(components.authority);
*result = malloc(host_end - host_start + 1);
if (!(*result)) {
url_destroy_components(&components);
return URL_FUNC_FAILED;
}
memcpy((*result), host_start, host_end - host_start);
(*result)[host_end - host_start] = '\0';
}
url_destroy_components(&components);
return status;
}
/**
* Return the scheme name from an URL.
*
* See RFC 3986, 3.1 for reference.
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold scheme name
* \return URL_FUNC_OK on success
*/
url_func_result url_scheme(const char *url, char **result)
{
url_func_result status;
struct url_components components;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if (!components.scheme) {
status = URL_FUNC_FAILED;
} else {
*result = strdup(components.scheme);
if (!(*result))
status = URL_FUNC_NOMEM;
}
}
url_destroy_components(&components);
return status;
}
/**
* Return the canonical root of an URL
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold canonical rool URL
* \return URL_FUNC_OK on success
*/
url_func_result url_canonical_root(const char *url, char **result)
{
url_func_result status;
struct url_components components;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if ((!components.scheme) || (!components.authority)) {
status = URL_FUNC_FAILED;
} else {
*result = malloc(strlen(components.scheme) +
strlen(components.authority) + 4);
if (!(*result))
status = URL_FUNC_NOMEM;
else
sprintf((*result), "%s://%s", components.scheme,
components.authority);
}
}
url_destroy_components(&components);
return status;
}
/**
* Strip the topmost segment of the path
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold result
* \return URL_FUNC_OK on success
*/
url_func_result url_parent(const char *url, char **result)
{
url_func_result status;
struct url_components components;
int len, path_len;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if ((!components.scheme) || (!components.authority) ||
(!components.path)) {
status = URL_FUNC_FAILED;
} else {
if (strcmp(components.path, "/")) {
path_len = strlen(components.path);
if (components.path[path_len - 1] == '/')
path_len--;
while (components.path[path_len - 1] != '/')
path_len--;
} else {
path_len = 1;
}
len = strlen(components.scheme) +
strlen(components.authority) +
path_len + 4;
*result = malloc(len);
if (!(*result))
status = URL_FUNC_NOMEM;
else
snprintf((*result), len, "%s://%s%s",
components.scheme,
components.authority,
components.path);
}
}
url_destroy_components(&components);
return status;
}
/**
* Extract path, leafname and query segments from an URL
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold result
* \return URL_FUNC_OK on success
*/
url_func_result url_plq(const char *url, char **result)
{
url_func_result status;
struct url_components components;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if (!components.path) {
status = URL_FUNC_FAILED;
} else if ((components.query) &&
(strlen(components.query) > 0)) {
*result = malloc(strlen(components.path) +
strlen(components.query) + 2);
if (!(*result))
status = URL_FUNC_NOMEM;
else
sprintf((*result), "%s?%s", components.path,
components.query);
} else {
*result = strdup(components.path);
if (!(*result))
status = URL_FUNC_NOMEM;
}
}
url_destroy_components(&components);
return status;
}
/**
* Extract path segment from an URL
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold result
* \return URL_FUNC_OK on success
*/
url_func_result url_path(const char *url, char **result)
{
url_func_result status;
struct url_components components;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if (!components.path) {
status = URL_FUNC_FAILED;
} else {
*result = strdup(components.path);
if (!(*result))
status = URL_FUNC_NOMEM;
}
}
url_destroy_components(&components);
return status;
}
/**
* Extract leafname from an URL
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold result
* \return URL_FUNC_OK on success
*/
url_func_result url_leafname(const char *url, char **result)
{
url_func_result status;
struct url_components components;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if (!components.path) {
status = URL_FUNC_FAILED;
} else {
char *slash = strrchr(components.path, '/');
assert (slash != NULL);
*result = strdup(slash + 1);
if (!(*result))
status = URL_FUNC_NOMEM;
}
}
url_destroy_components(&components);
return status;
}
/**
* Extract fragment from an URL
* This will unescape any %xx entities in the fragment
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold result
* \return URL_FUNC_OK on success
*/
url_func_result url_fragment(const char *url, char **result)
{
url_func_result status;
struct url_components components;
assert(url);
status = url_get_components(url, &components);
if (status == URL_FUNC_OK) {
if (!components.fragment) {
status = URL_FUNC_FAILED;
} else {
char *frag = curl_unescape(components.fragment,
strlen(components.fragment));
if (!frag) {
status = URL_FUNC_NOMEM;
} else {
*result = strdup(frag);
if (!(*result))
status = URL_FUNC_NOMEM;
curl_free(frag);
}
}
}
url_destroy_components(&components);
return status;
}
/**
* Attempt to find a nice filename for a URL.
*
* \param url an absolute URL
* \param result pointer to pointer to buffer to hold filename
* \param remove_extensions remove any extensions from the filename
* \return URL_FUNC_OK on success
*/
url_func_result url_nice(const char *url, char **result,
bool remove_extensions)
{
int m;
regmatch_t match[10];
regoff_t start, end;
size_t i;
char *dot;
*result = 0;
m = regexec(&url_re, url, 10, match, 0);
if (m) {
LOG(("url '%s' failed to match regex", url));
return URL_FUNC_FAILED;
}
/* extract the last component of the path, if possible */
if (match[URL_RE_PATH].rm_so == -1 || match[URL_RE_PATH].rm_so ==
match[URL_RE_PATH].rm_eo)
goto no_path; /* no path, or empty */
for (end = match[URL_RE_PATH].rm_eo - 1;
end != match[URL_RE_PATH].rm_so && url[end] == '/';
end--)
;
if (end == match[URL_RE_PATH].rm_so)
goto no_path; /* path is a string of '/' */
end++;
for (start = end - 1;
start != match[URL_RE_PATH].rm_so && url[start] != '/';
start--)
;
if (url[start] == '/')
start++;
if (!strncasecmp(url + start, "index.", 6) ||
!strncasecmp(url + start, "default.", 8)) {
/* try again */
if (start == match[URL_RE_PATH].rm_so)
goto no_path;
for (end = start - 1;
end != match[URL_RE_PATH].rm_so &&
url[end] == '/';
end--)
;
if (end == match[URL_RE_PATH].rm_so)
goto no_path;
end++;
for (start = end - 1;
start != match[URL_RE_PATH].rm_so &&
url[start] != '/';
start--)
;
if (url[start] == '/')
start++;
}
*result = malloc(end - start + 1);
if (!*result) {
LOG(("malloc failed"));
return URL_FUNC_NOMEM;
}
strncpy(*result, url + start, end - start);
(*result)[end - start] = 0;
if (remove_extensions) {
dot = strchr(*result, '.');
if (dot && dot != *result)
*dot = 0;
}
return URL_FUNC_OK;
no_path:
/* otherwise, use the host name, with '.' replaced by '_' */
if (match[URL_RE_AUTHORITY].rm_so != -1 &&
match[URL_RE_AUTHORITY].rm_so !=
match[URL_RE_AUTHORITY].rm_eo) {
*result = malloc(match[URL_RE_AUTHORITY].rm_eo -
match[URL_RE_AUTHORITY].rm_so + 1);
if (!*result) {
LOG(("malloc failed"));
return URL_FUNC_NOMEM;
}
strncpy(*result, url + match[URL_RE_AUTHORITY].rm_so,
match[URL_RE_AUTHORITY].rm_eo -
match[URL_RE_AUTHORITY].rm_so);
(*result)[match[URL_RE_AUTHORITY].rm_eo -
match[URL_RE_AUTHORITY].rm_so] = 0;
for (i = 0; (*result)[i]; i++)
if ((*result)[i] == '.')
(*result)[i] = '_';
return URL_FUNC_OK;
}
return URL_FUNC_FAILED;
}
/**
* Escape a string suitable for inclusion in an URL.
*
* \param unescaped the unescaped string
* \param toskip number of bytes to skip in unescaped string
* \param sptoplus true iff spaces should be converted to +
* \param escexceptions NULL or a string of characters excluded to be escaped
* \param result pointer to pointer to buffer to hold escaped string
* \return URL_FUNC_OK on success
*/
url_func_result url_escape(const char *unescaped, size_t toskip,
bool sptoplus, const char *escexceptions, char **result)
{
size_t len;
char *escaped, *d, *tmpres;
const char *c;
if (!unescaped || !result)
return URL_FUNC_FAILED;
*result = NULL;
len = strlen(unescaped);
if (len < toskip)
return URL_FUNC_FAILED;
len -= toskip;
escaped = malloc(len * 3 + 1);
if (!escaped)
return URL_FUNC_NOMEM;
for (c = unescaped + toskip, d = escaped; *c; c++) {
/* Check if we should escape this byte.
* '~' is unreserved and should not be percent encoded, if
* you believe the spec; however, leaving it unescaped
* breaks a bunch of websites, so we escape it anyway. */
if (!isascii(*c)
|| (strchr(":/?#[]@" /* gen-delims */
"!$&'()*+,;=" /* sub-delims */
"<>%\"{}|\\^`~" /* others */, *c)
&& (!escexceptions || !strchr(escexceptions, *c)))
|| *c <= 0x20 || *c == 0x7f) {
if (*c == 0x20 && sptoplus) {
*d++ = '+';
} else {
*d++ = '%';
*d++ = "0123456789ABCDEF"[((*c >> 4) & 0xf)];
*d++ = "0123456789ABCDEF"[(*c & 0xf)];
}
} else {
/* unreserved characters: [a-zA-Z0-9-._] */
*d++ = *c;
}
}
*d++ = '\0';
tmpres = malloc(d - escaped + toskip);
if (!tmpres) {
free(escaped);
return URL_FUNC_NOMEM;
}
memcpy(tmpres, unescaped, toskip);
memcpy(tmpres + toskip, escaped, d - escaped);
*result = tmpres;
free(escaped);
return URL_FUNC_OK;
}
/**
* Compare two absolute, normalized URLs
*
* \param url1 URL 1
* \param url2 URL 2
* \param nofrag Ignore fragment part in comparison
* \param result Pointer to location to store result (true if URLs match)
* \return URL_FUNC_OK on success
*/
url_func_result url_compare(const char *url1, const char *url2,
bool nofrag, bool *result)
{
url_func_result status;
struct url_components c1, c2;
bool res = true;
assert(url1 && url2 && result);
/* Decompose URLs */
status = url_get_components(url1, &c1);
if (status != URL_FUNC_OK) {
url_destroy_components(&c1);
return status;
}
status = url_get_components(url2, &c2);
if (status != URL_FUNC_OK) {
url_destroy_components(&c2);
url_destroy_components(&c1);
return status;
}
if (((c1.scheme && c2.scheme) || (!c1.scheme && !c2.scheme )) &&
((c1.authority && c2.authority) ||
(!c1.authority && !c2.authority)) &&
((c1.path && c2.path) || (!c1.path && !c2.path)) &&
((c1.query && c2.query) ||
(!c1.query && !c2.query)) &&
(nofrag || (c1.fragment && c2.fragment) ||
(!c1.fragment && !c2.fragment))) {
if (c1.scheme)
res &= strcasecmp(c1.scheme, c2.scheme) == 0;
/** \todo consider each part of the authority separately */
if (c1.authority)
res &= strcasecmp(c1.authority, c2.authority) == 0;
if (c1.path)
res &= strcmp(c1.path, c2.path) == 0;
if (c1.query)
res &= strcmp(c1.query, c2.query) == 0;
if (!nofrag && c1.fragment)
res &= strcmp(c1.fragment, c2.fragment) == 0;
} else {
/* Can't match */
res = false;
}
*result = res;
url_destroy_components(&c2);
url_destroy_components(&c1);
return URL_FUNC_OK;
}
/**
* Split a URL into separate components
*
* URLs passed to this function are assumed to be valid and no error checking
* or recovery is attempted.
*
* See RFC 3986 for reference.
*
* \param url a valid absolute or relative URL
* \param result pointer to buffer to hold components
* \return URL_FUNC_OK on success
*/
url_func_result url_get_components(const char *url,
struct url_components *result)
{
int storage_length;
char *storage_end;
const char *scheme;
const char *authority;
const char *path;
const char *query;
const char *fragment;
struct url_components_internal *internal;
assert(url);
/* clear our return value */
internal = (struct url_components_internal *)result;
memset(result, 0x00, sizeof(struct url_components));
/* get enough storage space for a URL with termination at each node */
storage_length = strlen(url) + 8;
internal->buffer = malloc(storage_length);
if (!internal->buffer)
return URL_FUNC_NOMEM;
storage_end = internal->buffer;
/* look for a valid scheme */
scheme = url;
if (isalpha(*scheme)) {
for (scheme = url + 1;
((*scheme != ':') && (*scheme != '\0'));
scheme++) {
if (!isalnum(*scheme) && (*scheme != '+') &&
(*scheme != '-') && (*scheme != '.'))
break;
}
if (*scheme == ':') {
memcpy(storage_end, url, scheme - url);
storage_end[scheme - url] = '\0';
result->scheme = storage_end;
storage_end += scheme - url + 1;
scheme++;
} else {
scheme = url;
}
}
/* look for an authority */
authority = scheme;
if ((authority[0] == '/') && (authority[1] == '/')) {
authority = strpbrk(scheme + 2, "/?#");
if (!authority)
authority = scheme + strlen(scheme);
memcpy(storage_end, scheme + 2, authority - scheme - 2);
storage_end[authority - scheme - 2] = '\0';
result->authority = storage_end;
storage_end += authority - scheme - 1;
}
/* look for a path */
path = authority;
if ((*path != '?') && (*path != '#') && (*path != '\0')) {
path = strpbrk(path, "?#");
if (!path)
path = authority + strlen(authority);
memcpy(storage_end, authority, path - authority);
storage_end[path - authority] = '\0';
result->path = storage_end;
storage_end += path - authority + 1;
}
/* look for a query */
query = path;
if (*query == '?') {
query = strchr(query, '#');
if (!query)
query = path + strlen(path);
memcpy(storage_end, path + 1, query - path - 1);
storage_end[query - path - 1] = '\0';
result->query = storage_end;
storage_end += query - path;
}
/* look for a fragment */
fragment = query;
if (*fragment == '#') {
fragment = query + strlen(query);
/* make a copy of the result for the caller */
memcpy(storage_end, query + 1, fragment - query - 1);
storage_end[fragment - query - 1] = '\0';
result->fragment = storage_end;
storage_end += fragment - query;
}
assert((result->buffer + storage_length) >= storage_end);
return URL_FUNC_OK;
}
/**
* Reform a URL from separate components
*
* See RFC 3986 for reference.
*
* \param components the components to reform into a URL
* \return a new URL allocated on the stack, or NULL on failure
*/
char *url_reform_components(const struct url_components *components)
{
int scheme_len = 0, authority_len = 0, path_len = 0, query_len = 0,
fragment_len = 0;
char *result, *url;
/* 5.3 */
if (components->scheme)
scheme_len = strlen(components->scheme) + 1;
if (components->authority)
authority_len = strlen(components->authority) + 2;
if (components->path)
path_len = strlen(components->path);
if (components->query)
query_len = strlen(components->query) + 1;
if (components->fragment)
fragment_len = strlen(components->fragment) + 1;
/* claim memory */
url = result = malloc(scheme_len + authority_len + path_len +
query_len + fragment_len + 1);
if (!url) {
LOG(("malloc failed"));
return NULL;
}
/* rebuild URL */
if (components->scheme) {
sprintf(url, "%s:", components->scheme);
url += scheme_len;
}
if (components->authority) {
sprintf(url, "//%s", components->authority);
url += authority_len;
}
if (components->path) {
sprintf(url, "%s", components->path);
url += path_len;
}
if (components->query) {
sprintf(url, "?%s", components->query);
url += query_len;
}
if (components->fragment)
sprintf(url, "#%s", components->fragment);
return result;
}
/**
* Release some url components from memory
*
* \param result pointer to buffer containing components
*/
void url_destroy_components(const struct url_components *components)
{
const struct url_components_internal *internal;
assert(components);
internal = (const struct url_components_internal *)components;
if (internal->buffer)
free(internal->buffer);
}
#ifdef TEST
int main(int argc, char *argv[])
{
int i;
url_func_result res;
char *s;
url_init();
for (i = 1; i != argc; i++) {
/* printf("==> '%s'\n", argv[i]);
res = url_normalize(argv[i], &s);
if (res == URL_FUNC_OK) {
printf("<== '%s'\n", s);
free(s);
}*/
/* printf("==> '%s'\n", argv[i]);
res = url_host(argv[i], &s);
if (res == URL_FUNC_OK) {
printf("<== '%s'\n", s);
free(s);
}*/
if (1 != i) {
res = url_join(argv[i], argv[1], &s);
if (res == URL_FUNC_OK) {
printf("'%s' + '%s' \t= '%s'\n", argv[1],
argv[i], s);
free(s);
}
}
/* printf("'%s' => ", argv[i]);
res = url_nice(argv[i], &s, true);
if (res == URL_FUNC_OK) {
printf("'%s', ", s);
free(s);
} else {
printf("failed %u, ", res);
}
res = url_nice(argv[i], &s, false);
if (res == URL_FUNC_OK) {
printf("'%s', ", s);
free(s);
} else {
printf("failed %u, ", res);
}
printf("\n");*/
}
return 0;
}
void regcomp_wrapper(regex_t *preg, const char *regex, int cflags)
{
char errbuf[200];
int r;
r = regcomp(preg, regex, cflags);
if (r) {
regerror(r, preg, errbuf, sizeof errbuf);
fprintf(stderr, "Failed to compile regexp '%s'\n", regex);
fprintf(stderr, "error: %s\n", errbuf);
exit(1);
}
}
#endif
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