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/*
* zsync - client side rsync over http
* Copyright (C) 2004,2005,2009 Colin Phipps <cph@moria.org.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the Artistic License v2 (see the accompanying
* file COPYING for the full license terms), or, at your option, any later
* version of the same license.
*
* This program 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
* COPYING file for details.
*/
/* Very crude URL parsing module */
#include "zsglobal.h"
#include <string.h>
#include <stdlib.h>
#ifdef WITH_DMALLOC
# include <dmalloc.h>
#endif
#include "url.h"
const char http_scheme[] = { "http://" };
/* path_str = get_http_host_port(url_str, &host, host_len, &port_str)
* For the given url_str, returns:
* the hostname, in host[] array provided by caller (up to length host_len)
* the port (if any) as a malloced string, pointer to this stored in *port_str
* return value is the path part of the URL, a malloced string.
* Or return value NULL on failure (host and port could have been written to).
*/
char *get_http_host_port(const char *url, char *hostn, int hnlen, char **port) {
char *p, *q;
/* Check it's HTTP */
if (memcmp(url, http_scheme, strlen(http_scheme)))
return NULL;
q = url + strlen(http_scheme);
p = strchr(q, ':');
if (p) { /* if : is after the first /, we have looked too far ahead */
char *r = strchr(q, '/');
if (r && r < p)
p = NULL;
}
if (!p) {
*port = strdup("http");
p = strchr(q, '/');
}
if (!p)
return NULL;
if (p - q < hnlen - 1) {
memcpy(hostn, q, p - q);
hostn[p - q] = 0;
}
if (*p == ':') {
size_t l;
q = p;
p = strchr(p, '/');
l = p ? (size_t) (p - q - 1) : strlen(q) - 1;
*port = malloc(l + 1);
if (!*port)
return NULL;
memcpy(*port, q + 1, l);
(*port)[l] = 0;
if (!p)
p = strdup("/");
}
return p;
}
/* abs_url_str = make_url_absolute(base_str, url_str)
* Returns an absolute version of url_str relative to base_str, as a malloced
* string. Or NULL on error. */
char * __attribute__ ((pure)) make_url_absolute(const char *base, const char *url) {
if (is_url_absolute(url))
return strdup(url);
/* Otherwise, we'll need a base URL to get the scheme and host */
if (!base)
return NULL;
/* Next, is it a full-path URL? */
if (*url == '/') {
size_t l;
char *newurl;
/* Find the end of the scheme of the base URL, then the end of the
* hostname[:port]/ */
const char *p = strchr(base, ':');
if (!p || p[1] != '/' || p[2] != '/')
return NULL;
p = strchr(p + 3, '/');
if (!p) /* We have a http://hostname URL (no trailing / or path) */
l = strlen(base);
else /* http://hostname/... , we want just http://hostname */
l = p - base;
/* assert */
if (base[l] != '/' && base[l] != '\0')
return NULL;
/* Append full path to the base http://hostname */
newurl = malloc(l + strlen(url) + 1);
memcpy(newurl, base, l);
strcpy(newurl + l, url);
return newurl;
}
/* No leading / or scheme - relative path */
{
int l;
char *newurl;
/* Find the end of the path part of the base URL */
const char *q;
const char *p = strchr(base, '?');
if (!p)
p = strchr(base, '#');
if (!p)
p = base + strlen(base);
/* Find the last / in the path part */
for (q = p; q > base && *q != '/'; q--);
if (*q != '/')
return NULL;
/* Take the base URL up to and including the last /, and append the relative URL */
l = q - base + 1;
newurl = malloc(l + strlen(url) + 1);
memcpy(newurl, base, l);
strcpy(newurl + l, url);
return newurl;
}
}
/* int n = is_url_absolute(url)
* Returns 0 if the supplied string is not an absolute URL.
* Returns the number of characters in the URL scheme if it is.
*/
static const char special[] = { ":/?" };
int __attribute__ ((pure)) is_url_absolute(const char *url) {
/* find end of first no-special-URL-characters part of the string */
int n = strcspn(url, special);
/* If the first special character is a :, the start is a URL scheme */
if (n > 0 && url[n] == ':')
return n;
/* otherwise, it's a full path or relative path URL, or just a local file
* path (caller knows the context) */
return 0;
}
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