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/* tinyproxy - A fast light-weight HTTP proxy
* Copyright (C) 1998 Steven Young <sdyoung@miranda.org>
* Copyright (C) 1999-2005 Robert James Kaes <rjkaes@users.sourceforge.net>
* Copyright (C) 2000 Chris Lightfoot <chris@ex-parrot.com>
* Copyright (C) 2002 Petr Lampa <lampa@fit.vutbr.cz>
* Copyright (C) 2009 Michael Adam <obnox@samba.org>
*
* This program 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Routines for handling the list of upstream proxies.
*/
#include "upstream.h"
#include "heap.h"
#include "log.h"
#include "base64.h"
#include "basicauth.h"
#ifdef UPSTREAM_SUPPORT
const char *
proxy_type_name(proxy_type type)
{
switch(type) {
case PT_NONE: return "none";
case PT_HTTP: return "http";
case PT_SOCKS4: return "socks4";
case PT_SOCKS5: return "socks5";
default: return "unknown";
}
}
const char* upstream_build_error_string(enum upstream_build_error ube) {
static const char *emap[] = {
[UBE_SUCCESS] = "",
[UBE_OOM] = "Unable to allocate memory in upstream_build()",
[UBE_USERLEN] = "User / pass in upstream config too long",
[UBE_EDOMAIN] = "Nonsense upstream none rule: empty domain",
[UBE_INVHOST] = "Nonsense upstream rule: invalid host or port",
[UBE_INVPARAMS] = "Nonsense upstream rule: invalid parameters",
[UBE_NETMASK] = "Nonsense upstream rule: failed to parse netmask",
};
return emap[ube];
}
/**
* Construct an upstream struct from input data.
*/
static struct upstream *upstream_build (const char *host, int port, const char *domain,
const char *user, const char *pass,
proxy_type type, enum upstream_build_error *ube)
{
char *ptr;
struct upstream *up;
*ube = UBE_SUCCESS;
up = (struct upstream *) safemalloc (sizeof (struct upstream));
if (!up) {
*ube = UBE_OOM;
return NULL;
}
up->type = type;
up->host = up->domain = up->ua.user = up->pass = NULL;
up->ip = up->mask = 0;
if (user) {
if (type == PT_HTTP) {
char b[BASE64ENC_BYTES((256+2)-1) + 1];
ssize_t ret;
ret = basicauth_string(user, pass, b, sizeof b);
if (ret == 0) {
*ube = UBE_USERLEN;
return NULL;
}
up->ua.authstr = safestrdup (b);
} else {
up->ua.user = safestrdup (user);
up->pass = safestrdup (pass);
}
}
if (domain == NULL) {
if (type == PT_NONE) {
e_nonedomain:;
*ube = UBE_EDOMAIN;
goto fail;
}
if (!host || !host[0] || port < 1) {
*ube = UBE_INVHOST;
goto fail;
}
up->host = safestrdup (host);
up->port = port;
log_message (LOG_INFO, "Added upstream %s %s:%d for [default]",
proxy_type_name(type), host, port);
} else {
if (type == PT_NONE) {
if (!domain[0]) goto e_nonedomain;
} else {
if (!host || !host[0] || !domain[0]) {
*ube = UBE_INVPARAMS;
goto fail;
}
up->host = safestrdup (host);
up->port = port;
}
ptr = strchr (domain, '/');
if (ptr) {
struct in_addr addrstruct;
*ptr = '\0';
if (inet_aton (domain, &addrstruct) != 0) {
up->ip = ntohl (addrstruct.s_addr);
*ptr++ = '/';
if (strchr (ptr, '.')) {
if (inet_aton (ptr, &addrstruct) != 0)
up->mask =
ntohl (addrstruct.s_addr);
} else {
up->mask =
~((1 << (32 - atoi (ptr))) - 1);
}
up->ip = up->ip & up->mask;
} else {
*ube = UBE_NETMASK;
goto fail;
}
} else {
up->domain = safestrdup (domain);
}
if (type == PT_NONE)
log_message (LOG_INFO, "Added upstream none for %s", domain);
else
log_message (LOG_INFO, "Added upstream %s %s:%d for %s",
proxy_type_name(type), host, port, domain);
}
return up;
fail:
safefree (up->ua.user);
safefree (up->pass);
safefree (up->host);
safefree (up->domain);
safefree (up);
return NULL;
}
/*
* Add an entry to the upstream list
*/
enum upstream_build_error upstream_add (
const char *host, int port, const char *domain,
const char *user, const char *pass,
proxy_type type, struct upstream **upstream_list)
{
struct upstream *up;
enum upstream_build_error ube;
up = upstream_build (host, port, domain, user, pass, type, &ube);
if (up == NULL) {
return ube;
}
if (!up->domain && !up->ip) { /* always add default to end */
struct upstream *tmp = *upstream_list;
while (tmp) {
if (!tmp->domain && !tmp->ip) {
log_message (LOG_WARNING,
"Duplicate default upstream");
goto upstream_cleanup;
}
if (!tmp->next) {
up->next = NULL;
tmp->next = up;
return ube;
}
tmp = tmp->next;
}
}
up->next = *upstream_list;
*upstream_list = up;
return ube;
upstream_cleanup:
safefree (up->host);
safefree (up->domain);
safefree (up);
return ube;
}
/*
* Check if a host is in the upstream list
*/
struct upstream *upstream_get (char *host, struct upstream *up)
{
in_addr_t my_ip = INADDR_NONE;
while (up) {
if (up->domain) {
if (strcasecmp (host, up->domain) == 0)
break; /* exact match */
if (up->domain[0] == '.') {
char *dot = strchr (host, '.');
if (!dot && !up->domain[1])
break; /* local host matches "." */
while (dot && strcasecmp (dot, up->domain))
dot = strchr (dot + 1, '.');
if (dot)
break; /* subdomain match */
}
} else if (up->ip) {
if (my_ip == INADDR_NONE)
my_ip = ntohl (inet_addr (host));
if ((my_ip & up->mask) == up->ip)
break;
} else {
break; /* No domain or IP, default upstream */
}
up = up->next;
}
if (up && (!up->host))
up = NULL;
if (up)
log_message (LOG_INFO, "Found upstream proxy %s %s:%d for %s",
proxy_type_name(up->type), up->host, up->port, host);
else
log_message (LOG_INFO, "No upstream proxy for %s", host);
return up;
}
void free_upstream_list (struct upstream *up)
{
while (up) {
struct upstream *tmp = up;
up = up->next;
safefree (tmp->domain);
safefree (tmp->host);
safefree (tmp);
}
}
#endif
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