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/* |
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* Copyright (C) 2002-2003 Erik Fears |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to |
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* |
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* The Free Software Foundation, Inc. |
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* 59 Temple Place - Suite 330 |
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* Boston, MA 02111-1307, USA. |
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* |
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* |
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*/ |
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|
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#include "setup.h" |
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|
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#include "config.h" |
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#include "libopm.h" |
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#include "malloc.h" |
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#include "opm_error.h" |
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#include "opm_types.h" |
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#include "opm_common.h" |
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#include "list.h" |
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#include "inet.h" |
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#include "proxy.h" |
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|
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#include <errno.h> |
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#include <sys/time.h> |
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#include <time.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <poll.h> |
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|
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|
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static OPM_PROTOCOL_CONFIG_T *libopm_protocol_config_create(void); |
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static void libopm_protocol_config_free(OPM_PROTOCOL_CONFIG_T *); |
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|
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/* |
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* XXX - does not appear to be used anywhere? |
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* -grifferz |
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*/ |
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#if 0 |
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static OPM_PROTOCOL_T *libopm_protocol_create(void); |
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static void libopm_protocol_free(OPM_PROTOCOL_T *); |
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#endif |
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|
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static OPM_SCAN_T *libopm_scan_create(OPM_T *, OPM_REMOTE_T *); |
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static void libopm_scan_free(OPM_SCAN_T *); |
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|
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static OPM_CONNECTION_T *libopm_connection_create(void); |
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static void libopm_connection_free(OPM_CONNECTION_T *); |
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|
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static void libopm_check_establish(OPM_T *); |
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static void libopm_check_poll(OPM_T *); |
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static void libopm_check_closed(OPM_T *); |
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static void libopm_check_queue(OPM_T *); |
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|
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static void libopm_do_connect(OPM_T *, OPM_SCAN_T *, OPM_CONNECTION_T *); |
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static void libopm_do_readready(OPM_T *, OPM_SCAN_T *, OPM_CONNECTION_T *); |
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static void libopm_do_writeready(OPM_T *, OPM_SCAN_T *, OPM_CONNECTION_T *); |
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static void libopm_do_hup(OPM_T *, OPM_SCAN_T *, OPM_CONNECTION_T *); |
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static void libopm_do_read(OPM_T *, OPM_SCAN_T *, OPM_CONNECTION_T *); |
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static void libopm_do_openproxy(OPM_T *, OPM_SCAN_T *, OPM_CONNECTION_T *); |
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static void libopm_do_callback(OPM_T *, OPM_REMOTE_T *, int, int); |
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|
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static OPM_REMOTE_T *libopm_setup_remote(OPM_REMOTE_T *, OPM_CONNECTION_T *); |
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|
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|
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/* OPM_PROTOCOLS hash |
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* |
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* OPM_PPROTOCOLS hashes the protocol types (int) to functions |
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* which handle the protocol (sending/receiving protocol specific |
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* data). |
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* |
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*/ |
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static OPM_PROTOCOL_T OPM_PROTOCOLS[] = |
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{ |
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{ OPM_TYPE_HTTP, libopm_proxy_http_write, NULL }, |
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{ OPM_TYPE_SOCKS4, libopm_proxy_socks4_write, NULL }, |
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{ OPM_TYPE_SOCKS5, libopm_proxy_socks5_write, NULL }, |
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{ OPM_TYPE_ROUTER, libopm_proxy_router_write, NULL }, |
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{ OPM_TYPE_WINGATE, libopm_proxy_wingate_write, NULL }, |
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{ OPM_TYPE_HTTPPOST, libopm_proxy_httppost_write, NULL } |
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}; |
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|
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/* opm_create |
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* |
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* Initialize a new scanner and return a pointer to it. |
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* |
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* Parameters: |
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* None |
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* |
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* Return |
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* Pointer to new OPM_T (scanner) |
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*/ |
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OPM_T * |
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opm_create(void) |
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{ |
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int i; |
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OPM_T *ret; |
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|
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ret = xcalloc(sizeof *ret); |
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|
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ret->config = libopm_config_create(); |
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ret->scans = libopm_list_create(); |
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ret->queue = libopm_list_create(); |
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ret->protocols = libopm_list_create(); |
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ret->fd_use = 0; |
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|
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/* Setup callbacks */ |
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ret->callbacks = xcalloc(sizeof(OPM_CALLBACK_T) * CBLEN); |
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|
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for (i = 0; i < CBLEN; i++) |
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{ |
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ret->callbacks[i].func = NULL; |
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ret->callbacks[i].data = NULL; |
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} |
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|
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return ret; |
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} |
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|
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/* opm_remote_create |
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* |
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* Create OPM_REMOTE_T struct, fill it with neccessary |
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* default values and return it to the client. |
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* |
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* Parameters: |
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* ip: IP of remote host |
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* |
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* Return: |
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* Address of OPM_REMOTE_T created |
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* |
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*/ |
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OPM_REMOTE_T * |
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opm_remote_create(const char *ip) |
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{ |
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OPM_REMOTE_T *ret; |
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|
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ret = xcalloc(sizeof *ret); |
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ret->ip = libopm_xstrdup(ip); |
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ret->protocols = libopm_list_create(); /* Setup protocol list */ |
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|
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return ret; |
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} |
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|
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/* opm_remote_free |
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* |
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* Free OPM_REMOTE_T struct and cleanup |
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* |
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* Parameters: |
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* remote: Struct to free |
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* |
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* Return: |
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* None |
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*/ |
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void |
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opm_remote_free(OPM_REMOTE_T *remote) |
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{ |
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OPM_NODE_T *p, *next; |
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OPM_PROTOCOL_CONFIG_T *ppc; |
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|
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MyFree(remote->ip); |
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|
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LIST_FOREACH_SAFE(p, next, remote->protocols->head) |
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{ |
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ppc = p->data; |
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|
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libopm_protocol_config_free(ppc); |
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libopm_list_remove(remote->protocols, p); |
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libopm_node_free(p); |
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} |
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|
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libopm_list_free(remote->protocols); |
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|
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MyFree(remote); |
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} |
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|
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/* opm_callback |
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* Register scanner level callback |
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* |
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* Parameters |
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* scanner: scanner struct |
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* type: callback type |
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* Return: |
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* Error code |
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*/ |
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|
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OPM_ERR_T |
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opm_callback(OPM_T *scanner, int type, OPM_CALLBACK_FUNC *function, void *data) |
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{ |
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if (type < 0 || type >= (CBLEN + 1)) |
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return OPM_ERR_CBNOTFOUND; |
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|
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scanner->callbacks[type].func = function; |
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scanner->callbacks[type].data = data; |
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|
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return OPM_SUCCESS; |
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} |
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|
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/* opm_free |
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* |
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* Free OPM_T (scanner) and cleanup |
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* |
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* Parameters: |
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* scanner: Address of OPM_T to cleanup |
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* |
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* Return: |
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* None |
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*/ |
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void |
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opm_free(OPM_T *scanner) |
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{ |
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OPM_NODE_T *p, *next; |
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OPM_PROTOCOL_CONFIG_T *ppc; |
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OPM_SCAN_T *scan; |
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|
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libopm_config_free(scanner->config); |
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|
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LIST_FOREACH_SAFE(p, next, scanner->protocols->head) |
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{ |
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ppc = p->data; |
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|
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libopm_protocol_config_free(ppc); |
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libopm_list_remove(scanner->protocols, p); |
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libopm_node_free(p); |
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} |
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|
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LIST_FOREACH_SAFE(p, next, scanner->scans->head) |
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{ |
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scan = p->data; |
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|
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libopm_scan_free(scan); |
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libopm_list_remove(scanner->scans, p); |
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libopm_node_free(p); |
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} |
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|
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LIST_FOREACH_SAFE(p, next, scanner->queue->head) |
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{ |
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scan = p->data; |
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|
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libopm_scan_free(scan); |
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libopm_list_remove(scanner->queue, p); |
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libopm_node_free(p); |
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} |
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|
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libopm_list_free(scanner->protocols); |
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libopm_list_free(scanner->scans); |
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libopm_list_free(scanner->queue); |
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|
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MyFree(scanner->callbacks); |
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MyFree(scanner); |
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} |
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|
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/* opm_config |
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* |
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* Wrapper to config_set. Set configuration variables |
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* on the config struct. |
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* |
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* Parameters: |
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* scanner: OPM_T struct the config struct resides in |
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* key: Variable within the config struct to set |
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* value: Address of value to set variable (key) to |
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* |
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* Return: |
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* OPM_ERR_T containing error code |
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*/ |
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OPM_ERR_T |
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opm_config(OPM_T *scanner, int key, const void *value) |
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{ |
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return libopm_config_set((scanner->config), key, value); |
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} |
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|
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/* opm_addtype |
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* |
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* Add a proxy type and port to the list of protocols |
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* a scanner will use. |
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* |
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* Parameters: |
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* scanner: pointer to scanner struct |
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* type: type of proxy to scan (used in hashing to the functions) |
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* port: port this specific type/protocol will scan on |
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* Return: |
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* OPM_SUCCESS: Successful protocol add |
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* OPM_ERR_BADPROTOCOL: Protocol is unknown |
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*/ |
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OPM_ERR_T |
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opm_addtype(OPM_T *scanner, int type, unsigned short int port) |
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{ |
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unsigned int i; |
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|
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OPM_NODE_T *node; |
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OPM_PROTOCOL_CONFIG_T *protocol_config; |
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|
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for (i = 0; i < sizeof(OPM_PROTOCOLS) / sizeof(OPM_PROTOCOL_T); i++) |
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{ |
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if (type == OPM_PROTOCOLS[i].type) |
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{ |
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protocol_config = libopm_protocol_config_create(); |
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protocol_config->type = &OPM_PROTOCOLS[i]; |
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protocol_config->port = port; |
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|
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node = libopm_node_create(protocol_config); |
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libopm_list_add(scanner->protocols, node); |
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|
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return OPM_SUCCESS; |
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} |
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} |
317 |
|
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return OPM_ERR_BADPROTOCOL; |
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} |
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|
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/* opm_remote_addtype |
322 |
* |
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* Add a proxy type and port to the list of protocols |
324 |
* a scanner will use. |
325 |
* |
326 |
* Parameters: |
327 |
* remote: pointer to scanner struct |
328 |
* type: type of proxy to scan (used in hashing to the functions) |
329 |
* port: port this specific type/protocol will scan on |
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* Return: |
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* OPM_SUCCESS: Successful protocol add |
332 |
* OPM_ERR_BADPROTOCOL: Protocol is unknown |
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*/ |
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OPM_ERR_T opm_remote_addtype(OPM_REMOTE_T *remote, int type, unsigned short int port) |
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{ |
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unsigned int i; |
337 |
|
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OPM_NODE_T *node; |
339 |
OPM_PROTOCOL_CONFIG_T *protocol_config; |
340 |
|
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for (i = 0; i < sizeof(OPM_PROTOCOLS) / sizeof(OPM_PROTOCOL_T); i++) |
342 |
{ |
343 |
if (type == OPM_PROTOCOLS[i].type) |
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{ |
345 |
protocol_config = libopm_protocol_config_create(); |
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protocol_config->type = &OPM_PROTOCOLS[i]; |
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protocol_config->port = port; |
348 |
|
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node = libopm_node_create(protocol_config); |
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libopm_list_add(remote->protocols, node); |
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|
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return OPM_SUCCESS; |
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} |
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} |
355 |
|
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return OPM_ERR_BADPROTOCOL; |
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} |
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|
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/* libopm_protocol_create |
360 |
* |
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* Create OPM_PROTOCOL_T struct. |
362 |
* |
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* Parameters: |
364 |
* None |
365 |
* Return: |
366 |
* Pointer to new struct |
367 |
* |
368 |
* XXX - does not appear to be used anywhere? |
369 |
* -grifferz |
370 |
*/ |
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#if 0 |
372 |
static OPM_PROTOCOL_T *libopm_protocol_create(void) |
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{ |
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OPM_PROTOCOL_T *ret; |
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ret = xcalloc(sizeof(OPM_PROTOCOL_T)); |
376 |
|
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ret->type = 0; |
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ret->write_function = NULL; |
379 |
ret->read_function = NULL; |
380 |
|
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return ret; |
382 |
} |
383 |
#endif |
384 |
|
385 |
/* libopm_protocol_free |
386 |
* |
387 |
* Free an OPM_PROTOCOL_T struct. Assume that if |
388 |
* format is not NULL, it is pointed to dynamically |
389 |
* allocated memory and free it. |
390 |
* |
391 |
* Parameters: |
392 |
* protocol: struct to free |
393 |
* |
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* Return: |
395 |
* None |
396 |
* |
397 |
* XXX - apparently no longer used? |
398 |
* -grifferz |
399 |
*/ |
400 |
#if 0 |
401 |
static void |
402 |
libopm_protocol_free(OPM_PROTOCOL_T *protocol) |
403 |
{ |
404 |
MyFree(protocol); |
405 |
} |
406 |
#endif |
407 |
|
408 |
/* libopm_protocol_config_create |
409 |
* |
410 |
* Allocate and return address of a new OPM_PROTOCOL_CONFIG_T |
411 |
* |
412 |
* Parameters: |
413 |
* None |
414 |
* |
415 |
* Return: |
416 |
* Address of new OPM_PROTOCOL_CONFIG_T |
417 |
*/ |
418 |
static OPM_PROTOCOL_CONFIG_T * |
419 |
libopm_protocol_config_create(void) |
420 |
{ |
421 |
OPM_PROTOCOL_CONFIG_T *ret; |
422 |
ret = xcalloc(sizeof *ret); |
423 |
|
424 |
return ret; |
425 |
} |
426 |
|
427 |
/* protocol_config_free |
428 |
* |
429 |
* Free OPM_PROTOCOL_CONFIG_T struct |
430 |
* |
431 |
* Parameters: |
432 |
* protocol: struct to free |
433 |
* |
434 |
* Return: |
435 |
* None |
436 |
*/ |
437 |
static void |
438 |
libopm_protocol_config_free(OPM_PROTOCOL_CONFIG_T *protocol) |
439 |
{ |
440 |
MyFree(protocol); |
441 |
} |
442 |
|
443 |
/* opm_scan |
444 |
* |
445 |
* Scan remote host. The opm_scan function takes an OPM_REMOTE_T |
446 |
* struct, calculates the in_addr of the remote host, and creates |
447 |
* a scan list based on protocols defined in the scanner. |
448 |
* |
449 |
* Parameters: |
450 |
* scanner: Scanner to scan host on |
451 |
* remote: OPM_REMOTE_T defining remote host |
452 |
* |
453 |
* Return: |
454 |
* (to be written) |
455 |
*/ |
456 |
OPM_ERR_T |
457 |
opm_scan(OPM_T *scanner, OPM_REMOTE_T *remote) |
458 |
{ |
459 |
OPM_SCAN_T *scan; /* New scan for OPM_T */ |
460 |
OPM_NODE_T *node; /* Node we'll add scan to when we link it to scans */ |
461 |
unsigned int fd_limit; |
462 |
|
463 |
fd_limit = *(int *)libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT); |
464 |
|
465 |
if (LIST_SIZE(scanner->protocols) == 0 && |
466 |
LIST_SIZE(remote->protocols) == 0) |
467 |
return OPM_ERR_NOPROTOCOLS; |
468 |
|
469 |
scan = libopm_scan_create(scanner, remote); |
470 |
|
471 |
if (inet_pton(AF_INET, remote->ip, &(scan->addr.sa4.sin_addr) ) <= 0) |
472 |
{ |
473 |
libopm_scan_free(scan); |
474 |
return OPM_ERR_BADADDR; |
475 |
} |
476 |
|
477 |
node = libopm_node_create(scan); |
478 |
libopm_list_add(scanner->queue, node); |
479 |
|
480 |
return OPM_SUCCESS; |
481 |
} |
482 |
|
483 |
/* opm_end |
484 |
* |
485 |
* End a scan prematurely. |
486 |
* |
487 |
* Parameters: |
488 |
* scanner: Scanner to end scan on |
489 |
* remote: Pointer to remote struct to search for and end |
490 |
* |
491 |
* Return: |
492 |
* No return. OPM_CALLBACK_END will still be called as normal. |
493 |
*/ |
494 |
void |
495 |
opm_end(OPM_T *scanner, OPM_REMOTE_T *remote) |
496 |
{ |
497 |
OPM_NODE_T *node1, *node2, *next1, *next2; |
498 |
OPM_SCAN_T *scan; |
499 |
OPM_CONNECTION_T *conn; |
500 |
|
501 |
/* End active scans */ |
502 |
opm_endscan(scanner, remote); |
503 |
|
504 |
/* |
505 |
* Secondly remove all traces of it in the queue. Once removed we have to call |
506 |
* OPM_CALLBACK_END |
507 |
*/ |
508 |
LIST_FOREACH_SAFE(node1, next1, scanner->queue->head) |
509 |
{ |
510 |
scan = node1->data; |
511 |
|
512 |
if (scan->remote == remote) |
513 |
{ |
514 |
/* Free all connections */ |
515 |
LIST_FOREACH_SAFE(node2, next2, scan->connections->head) |
516 |
{ |
517 |
conn = node2->data; |
518 |
|
519 |
libopm_list_remove(scan->connections, node2); |
520 |
libopm_connection_free(conn); |
521 |
libopm_node_free(node2); |
522 |
continue; |
523 |
} |
524 |
|
525 |
/* OPM_CALLBACK_END because check_closed normally handles this */ |
526 |
libopm_do_callback(scanner, scan->remote, OPM_CALLBACK_END, 0); |
527 |
|
528 |
/* Free up the scan */ |
529 |
libopm_list_remove(scanner->queue, node1); |
530 |
libopm_scan_free(scan); |
531 |
libopm_node_free(node1); |
532 |
} |
533 |
} |
534 |
} |
535 |
|
536 |
/* opm_endscan |
537 |
* |
538 |
* End a scan prematurely. Only end non-queued scans. This is useful |
539 |
* because it only checks the active scan list (saving time), where |
540 |
* opm_end checks both the scan and the possibly large queue. |
541 |
* |
542 |
* Parameters: |
543 |
* scanner: Scanner to end scan on |
544 |
* remote: Pointer to remote struct to search for and end |
545 |
* |
546 |
* Return: |
547 |
* No return. OPM_CALLBACK_END will still be called as normal. |
548 |
*/ |
549 |
void |
550 |
opm_endscan(OPM_T *scanner, OPM_REMOTE_T *remote) |
551 |
{ |
552 |
OPM_NODE_T *node1, *node2; |
553 |
OPM_SCAN_T *scan; |
554 |
OPM_CONNECTION_T *conn; |
555 |
|
556 |
/* |
557 |
* First check to see if it's in the queue, if it is set all connections closed |
558 |
* Next cycle of libopm_check_closed will take care of the garbage and handle |
559 |
* OPM_CALLBACK_END |
560 |
*/ |
561 |
LIST_FOREACH(node1, scanner->scans->head) |
562 |
{ |
563 |
scan = node1->data; |
564 |
|
565 |
if (scan->remote == remote) |
566 |
{ |
567 |
LIST_FOREACH(node2, scan->connections->head) |
568 |
{ |
569 |
conn = (OPM_CONNECTION_T *) node2->data; |
570 |
conn->state = OPM_STATE_CLOSED; |
571 |
} |
572 |
} |
573 |
} |
574 |
} |
575 |
|
576 |
/* opm_active |
577 |
|
578 |
Return number of scans in a scanner left. |
579 |
|
580 |
Parameters: |
581 |
scanner: Scanner to return active scans on |
582 |
|
583 |
Return: |
584 |
Number of active scans, both queued and active. |
585 |
*/ |
586 |
size_t |
587 |
opm_active(OPM_T *scanner) |
588 |
{ |
589 |
return LIST_SIZE(scanner->queue) + LIST_SIZE(scanner->scans); |
590 |
} |
591 |
|
592 |
/* scan_create |
593 |
* |
594 |
* Create new OPM_SCAN_T struct |
595 |
* |
596 |
* Parameters: |
597 |
* scanner: Scanner the scan is being created for. This |
598 |
* is needed to get information on currently set |
599 |
* protocols/config. |
600 |
* |
601 |
* remote: Remote host this scan will be scanning |
602 |
* |
603 |
* Return |
604 |
* Address of new struct |
605 |
*/ |
606 |
static OPM_SCAN_T * |
607 |
libopm_scan_create(OPM_T *scanner, OPM_REMOTE_T *remote) |
608 |
{ |
609 |
OPM_SCAN_T *ret; |
610 |
OPM_CONNECTION_T *conn; |
611 |
OPM_NODE_T *node, *p; |
612 |
|
613 |
ret = xcalloc(sizeof *ret); |
614 |
|
615 |
ret->remote = remote; |
616 |
ret->connections = libopm_list_create(); |
617 |
|
618 |
/* Setup list of connections, one for each protocol */ |
619 |
LIST_FOREACH(p, scanner->protocols->head) |
620 |
{ |
621 |
conn = libopm_connection_create(); |
622 |
|
623 |
conn->protocol = ((OPM_PROTOCOL_CONFIG_T *) p->data)->type; |
624 |
conn->port = ((OPM_PROTOCOL_CONFIG_T *) p->data)->port; |
625 |
|
626 |
node = libopm_node_create(conn); |
627 |
|
628 |
libopm_list_add(ret->connections, node); |
629 |
} |
630 |
|
631 |
/* |
632 |
* Do the same for any specific protocols the remote struct might be configured with |
633 |
*/ |
634 |
LIST_FOREACH(p, remote->protocols->head) |
635 |
{ |
636 |
conn = libopm_connection_create(); |
637 |
|
638 |
conn->protocol = ((OPM_PROTOCOL_CONFIG_T *) p->data)->type; |
639 |
conn->port = ((OPM_PROTOCOL_CONFIG_T *) p->data)->port; |
640 |
|
641 |
node = libopm_node_create(conn); |
642 |
libopm_list_add(ret->connections, node); |
643 |
} |
644 |
|
645 |
memset(&(ret->addr), 0, sizeof(opm_sockaddr)); |
646 |
return ret; |
647 |
} |
648 |
|
649 |
/* scan_free |
650 |
* |
651 |
* Free and cleanup OPM_SCAN_T struct |
652 |
* |
653 |
* Parametsr: |
654 |
* scan: Scan struct to free |
655 |
* |
656 |
* Return: |
657 |
* None |
658 |
*/ |
659 |
static void |
660 |
libopm_scan_free(OPM_SCAN_T *scan) |
661 |
{ |
662 |
OPM_NODE_T *p, *next; |
663 |
OPM_CONNECTION_T *conn; |
664 |
|
665 |
LIST_FOREACH_SAFE(p, next, scan->connections->head) |
666 |
{ |
667 |
conn = p->data; |
668 |
|
669 |
libopm_connection_free(conn); |
670 |
libopm_list_remove(scan->connections, p); |
671 |
libopm_node_free(p); |
672 |
} |
673 |
|
674 |
libopm_list_free(scan->connections); |
675 |
|
676 |
MyFree(scan); |
677 |
} |
678 |
|
679 |
/* connection_create |
680 |
* |
681 |
* Allocate new OPM_CONNECTION_T |
682 |
* |
683 |
* Parameters: |
684 |
* None |
685 |
* |
686 |
* Return: |
687 |
* Address of new OPM_CONNECTION_T |
688 |
*/ |
689 |
static OPM_CONNECTION_T * |
690 |
libopm_connection_create(void) |
691 |
{ |
692 |
OPM_CONNECTION_T *ret; |
693 |
|
694 |
ret = xcalloc(sizeof *ret); |
695 |
|
696 |
ret->fd = 0; |
697 |
ret->bytes_read = 0; |
698 |
ret->readlen = 0; |
699 |
ret->protocol = 0; |
700 |
ret->port = 0; |
701 |
|
702 |
ret->state = OPM_STATE_UNESTABLISHED; |
703 |
|
704 |
return ret; |
705 |
} |
706 |
|
707 |
/* connection_free |
708 |
* |
709 |
* Free OPM_CONNECTION_T struct |
710 |
* |
711 |
* Parameters: |
712 |
* conn: Address of struct to free |
713 |
* |
714 |
* Return: |
715 |
* None |
716 |
*/ |
717 |
static void |
718 |
libopm_connection_free(OPM_CONNECTION_T *conn) |
719 |
{ |
720 |
MyFree(conn); |
721 |
} |
722 |
|
723 |
/* opm_cycle |
724 |
* |
725 |
* Perform tasks (called by client's loop) |
726 |
* |
727 |
* Parameters: |
728 |
* None |
729 |
* Return: |
730 |
* None |
731 |
*/ |
732 |
void |
733 |
opm_cycle(OPM_T *scanner) |
734 |
{ |
735 |
libopm_check_queue(scanner); /* Move scans from the queue to the live scan list */ |
736 |
libopm_check_establish(scanner); /* Make new connections if possible */ |
737 |
libopm_check_poll(scanner); /* Poll connections for IO and proxy test */ |
738 |
libopm_check_closed(scanner); /* Check for closed or timed out connections */ |
739 |
} |
740 |
|
741 |
/* check_queue |
742 |
* |
743 |
* Move scans from the queue to the live scan list as long as there is |
744 |
* room. |
745 |
* |
746 |
* Parameters: |
747 |
* scanner: Scanner to check queue on |
748 |
* |
749 |
* Return: |
750 |
* None |
751 |
*/ |
752 |
static void |
753 |
libopm_check_queue(OPM_T *scanner) |
754 |
{ |
755 |
OPM_NODE_T *node; |
756 |
OPM_SCAN_T *scan; |
757 |
|
758 |
unsigned int protocols, projected, fd_limit; |
759 |
|
760 |
if(LIST_SIZE(scanner->queue) == 0) |
761 |
return; |
762 |
|
763 |
fd_limit = *(int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT); |
764 |
|
765 |
projected = scanner->fd_use; |
766 |
|
767 |
/* We want to keep the live scan list as small as possible, so only |
768 |
move queued scans to the live list if they will not push above fd_limit */ |
769 |
while(LIST_SIZE(scanner->queue) > 0) |
770 |
{ |
771 |
|
772 |
/* Grab the top scan */ |
773 |
scan = scanner->queue->head->data; |
774 |
protocols = LIST_SIZE(scan->connections); |
775 |
|
776 |
/* Check if it will fit in the live scan list */ |
777 |
if((protocols + projected) > fd_limit) |
778 |
break; |
779 |
|
780 |
/* Scans on the top of the queue were added first, swap the head off the |
781 |
top of the queue and add it to the tail of the live scan list */ |
782 |
node = libopm_list_remove(scanner->queue, scanner->queue->head); |
783 |
libopm_list_add(scanner->scans, node); |
784 |
projected += protocols; |
785 |
} |
786 |
|
787 |
} |
788 |
|
789 |
/* check_establish |
790 |
* |
791 |
* Make new connections if there are free file descriptors and connections |
792 |
* to be made. |
793 |
* |
794 |
* Parameters: |
795 |
* scanner: Scanner to check for establish on |
796 |
* Return: |
797 |
* None |
798 |
*/ |
799 |
static void |
800 |
libopm_check_establish(OPM_T *scanner) |
801 |
{ |
802 |
OPM_NODE_T *node1, *node2; |
803 |
OPM_SCAN_T *scan; |
804 |
OPM_CONNECTION_T *conn; |
805 |
unsigned int fd_limit; |
806 |
|
807 |
if (LIST_SIZE(scanner->scans) == 0) |
808 |
return; |
809 |
|
810 |
fd_limit = *(int *)libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT); |
811 |
|
812 |
if (scanner->fd_use >= fd_limit) |
813 |
return; |
814 |
|
815 |
LIST_FOREACH(node1, scanner->scans->head) |
816 |
{ |
817 |
scan = node1->data; |
818 |
|
819 |
LIST_FOREACH(node2, scan->connections->head) |
820 |
{ |
821 |
/* Only scan if we have free file descriptors */ |
822 |
if (scanner->fd_use >= fd_limit) |
823 |
return; |
824 |
|
825 |
conn = node2->data; |
826 |
|
827 |
if (conn->state == OPM_STATE_UNESTABLISHED) |
828 |
libopm_do_connect(scanner, scan, conn); |
829 |
} |
830 |
} |
831 |
} |
832 |
|
833 |
/* check_closed |
834 |
* |
835 |
* Check for connections which have timed out or are |
836 |
* closed. Connections timed out still need to be closed. |
837 |
* |
838 |
* Remove the connection from the list of connections, free |
839 |
* the connection struct and free the list node. Then if this is |
840 |
* the last connection of the scan, consider the scan completed and |
841 |
* free the scan aswell (and callback that the scan ended). |
842 |
* |
843 |
* Parameters: |
844 |
* scanner: Scanner to check on |
845 |
* Return: |
846 |
* None |
847 |
*/ |
848 |
static void |
849 |
libopm_check_closed(OPM_T *scanner) |
850 |
{ |
851 |
|
852 |
time_t present; |
853 |
OPM_NODE_T *node1, *node2, *next1, *next2; |
854 |
int timeout; |
855 |
|
856 |
OPM_SCAN_T *scan; |
857 |
OPM_CONNECTION_T *conn; |
858 |
|
859 |
if(LIST_SIZE(scanner->scans) == 0) |
860 |
return; |
861 |
|
862 |
time(&present); |
863 |
|
864 |
timeout = *(int *) libopm_config(scanner->config, OPM_CONFIG_TIMEOUT); |
865 |
|
866 |
LIST_FOREACH_SAFE(node1, next1, scanner->scans->head) |
867 |
{ |
868 |
scan = node1->data; |
869 |
LIST_FOREACH_SAFE(node2, next2, scan->connections->head) |
870 |
{ |
871 |
|
872 |
conn = node2->data; |
873 |
|
874 |
if(conn->state == OPM_STATE_CLOSED) |
875 |
{ |
876 |
if(conn->fd > 0) |
877 |
close(conn->fd); |
878 |
|
879 |
scanner->fd_use--; |
880 |
|
881 |
libopm_list_remove(scan->connections, node2); |
882 |
libopm_connection_free(conn); |
883 |
libopm_node_free(node2); |
884 |
continue; |
885 |
} |
886 |
|
887 |
if(((present - conn->creation) >= timeout) && |
888 |
conn->state != OPM_STATE_UNESTABLISHED) |
889 |
{ |
890 |
|
891 |
close(conn->fd); |
892 |
scanner->fd_use--; |
893 |
|
894 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_TIMEOUT, 0); |
895 |
|
896 |
libopm_list_remove(scan->connections, node2); |
897 |
libopm_connection_free(conn); |
898 |
libopm_node_free(node2); |
899 |
|
900 |
continue; |
901 |
} |
902 |
} |
903 |
|
904 |
/* No more connections left in this scan, let the |
905 |
client know the scan has ended, then remove the |
906 |
scan from the scanner, and free it up */ |
907 |
if(LIST_SIZE(scan->connections) == 0) |
908 |
{ |
909 |
libopm_do_callback(scanner, scan->remote, OPM_CALLBACK_END, 0); |
910 |
|
911 |
libopm_list_remove(scanner->scans, node1); |
912 |
libopm_scan_free(scan); |
913 |
libopm_node_free(node1); |
914 |
} |
915 |
} |
916 |
} |
917 |
|
918 |
/* do_connect |
919 |
* |
920 |
* Call socket() and connect() to start a scan. |
921 |
* |
922 |
* Parametsr: |
923 |
* scan: Scan struct containing the connection |
924 |
* conn: Connection to establish |
925 |
* Return: |
926 |
* None |
927 |
*/ |
928 |
static void |
929 |
libopm_do_connect(OPM_T * scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
930 |
{ |
931 |
opm_sockaddr *bind_ip; |
932 |
|
933 |
struct sockaddr_in *addr; /* Outgoing host */ |
934 |
struct sockaddr_in local_addr; /* For binding */ |
935 |
|
936 |
addr = (struct sockaddr_in *) &(scan->addr.sa4); /* Already have the IP in byte format from opm_scan */ |
937 |
|
938 |
addr->sin_family = AF_INET; |
939 |
addr->sin_port = htons(conn->port); |
940 |
|
941 |
|
942 |
bind_ip = (opm_sockaddr *) libopm_config(scanner->config, OPM_CONFIG_BIND_IP); |
943 |
|
944 |
conn->fd = socket(PF_INET, SOCK_STREAM, 0); |
945 |
scanner->fd_use++; /* Increase file descriptor use */ |
946 |
|
947 |
if(conn->fd == -1) |
948 |
{ |
949 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_ERROR, OPM_ERR_NOFD); |
950 |
conn->state = OPM_STATE_CLOSED; |
951 |
return; |
952 |
} |
953 |
|
954 |
if(bind_ip != NULL) |
955 |
{ |
956 |
memset(&local_addr, 0, sizeof(local_addr)); |
957 |
local_addr.sin_addr.s_addr = bind_ip->sa4.sin_addr.s_addr; |
958 |
local_addr.sin_family = AF_INET; |
959 |
local_addr.sin_port = htons(0); |
960 |
|
961 |
if(bind(conn->fd, (struct sockaddr *) &(local_addr), sizeof(local_addr)) == -1) |
962 |
{ |
963 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_ERROR, OPM_ERR_BIND); |
964 |
conn->state = OPM_STATE_CLOSED; |
965 |
return; |
966 |
} |
967 |
} |
968 |
|
969 |
/* Set socket non blocking */ |
970 |
fcntl(conn->fd, F_SETFL, O_NONBLOCK); |
971 |
|
972 |
connect(conn->fd, (struct sockaddr *) addr, sizeof(*addr)); |
973 |
|
974 |
conn->state = OPM_STATE_ESTABLISHED; |
975 |
time(&(conn->creation)); /* Stamp creation time, for timeout */ |
976 |
} |
977 |
|
978 |
/* check_poll |
979 |
* |
980 |
* Check sockets for ready read/write |
981 |
* |
982 |
* Parameters: |
983 |
* scanner: Scanner to isolate check on |
984 |
* Return: |
985 |
* None |
986 |
*/ |
987 |
static void |
988 |
libopm_check_poll(OPM_T *scanner) |
989 |
{ |
990 |
OPM_NODE_T *node1, *node2; |
991 |
OPM_SCAN_T *scan; |
992 |
OPM_CONNECTION_T *conn; |
993 |
|
994 |
static unsigned int ufds_size; |
995 |
static struct pollfd *ufds = NULL; |
996 |
|
997 |
unsigned int size, i; |
998 |
size = 0; |
999 |
|
1000 |
/* Grow pollfd array (ufds) as needed */ |
1001 |
if(ufds_size < (*(unsigned int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT))) |
1002 |
{ |
1003 |
MyFree(ufds); |
1004 |
ufds = xcalloc((sizeof *ufds) * (*(unsigned int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT))); |
1005 |
ufds_size = (*(unsigned int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT)); |
1006 |
} |
1007 |
|
1008 |
if(LIST_SIZE(scanner->scans) == 0) |
1009 |
return; |
1010 |
|
1011 |
LIST_FOREACH(node1, scanner->scans->head) |
1012 |
{ |
1013 |
scan = node1->data; |
1014 |
LIST_FOREACH(node2, scan->connections->head) |
1015 |
{ |
1016 |
if(size >= ufds_size) |
1017 |
break; |
1018 |
|
1019 |
conn = node2->data; |
1020 |
|
1021 |
if(conn->state < OPM_STATE_ESTABLISHED || |
1022 |
conn->state == OPM_STATE_CLOSED) |
1023 |
continue; |
1024 |
|
1025 |
ufds[size].events = 0; |
1026 |
ufds[size].revents = 0; |
1027 |
ufds[size].fd = conn->fd; |
1028 |
|
1029 |
/* Check for HUNG UP. */ |
1030 |
ufds[size].events |= POLLHUP; |
1031 |
/* Check for INVALID FD */ |
1032 |
ufds[size].events |= POLLNVAL; |
1033 |
|
1034 |
switch(conn->state) |
1035 |
{ |
1036 |
case OPM_STATE_ESTABLISHED: |
1037 |
ufds[size].events |= POLLOUT; |
1038 |
break; |
1039 |
case OPM_STATE_NEGSENT: |
1040 |
ufds[size].events |= POLLIN; |
1041 |
break; |
1042 |
} |
1043 |
size++; |
1044 |
} |
1045 |
|
1046 |
} |
1047 |
|
1048 |
switch (poll(ufds, size, 0)) |
1049 |
{ |
1050 |
case -1: |
1051 |
/* error in select/poll */ |
1052 |
return; |
1053 |
case 0: |
1054 |
/* Nothing to do */ |
1055 |
return; |
1056 |
/* Pass pointer to connection to handler. */ |
1057 |
} |
1058 |
|
1059 |
LIST_FOREACH(node1, scanner->scans->head) |
1060 |
{ |
1061 |
scan = (OPM_SCAN_T *) node1->data; |
1062 |
|
1063 |
LIST_FOREACH(node2, scan->connections->head) |
1064 |
{ |
1065 |
conn = (OPM_CONNECTION_T *) node2->data; |
1066 |
|
1067 |
for(i = 0; i < size; i++) |
1068 |
{ |
1069 |
if((ufds[i].fd == conn->fd) && (conn->state != OPM_STATE_CLOSED)) |
1070 |
{ |
1071 |
if(ufds[i].revents & POLLIN) |
1072 |
libopm_do_readready(scanner, scan, conn); |
1073 |
if(ufds[i].revents & POLLOUT) |
1074 |
libopm_do_writeready(scanner, scan, conn); |
1075 |
if(ufds[i].revents & POLLHUP) |
1076 |
libopm_do_hup(scanner, scan, conn); |
1077 |
} |
1078 |
} |
1079 |
} |
1080 |
} |
1081 |
} |
1082 |
|
1083 |
/* do_readready |
1084 |
* |
1085 |
* Remote connection is read ready, read the data into a buffer and check it against |
1086 |
* the target_string if neccessary |
1087 |
* |
1088 |
* Parameters: |
1089 |
* scanner: Scanner doing the scan |
1090 |
* scan: Specific scan |
1091 |
* conn: Specific connection in the scan |
1092 |
* |
1093 |
* Return: |
1094 |
* None |
1095 |
*/ |
1096 |
static void |
1097 |
libopm_do_readready(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1098 |
{ |
1099 |
|
1100 |
int max_read; |
1101 |
char c; |
1102 |
|
1103 |
/* If protocol has a specific read function, call that instead of |
1104 |
reading data from here. */ |
1105 |
if(conn->protocol->read_function) |
1106 |
{ |
1107 |
conn->protocol->read_function(scanner, scan, conn); |
1108 |
return; |
1109 |
} |
1110 |
|
1111 |
max_read = *(int *) libopm_config(scanner->config, OPM_CONFIG_MAX_READ); |
1112 |
|
1113 |
while(1) |
1114 |
{ |
1115 |
switch (read(conn->fd, &c, 1)) |
1116 |
{ |
1117 |
case 0: |
1118 |
libopm_do_hup(scanner, scan, conn); |
1119 |
return; |
1120 |
|
1121 |
case -1: |
1122 |
if(errno != EAGAIN) |
1123 |
libopm_do_hup(scanner, scan, conn); |
1124 |
return; |
1125 |
|
1126 |
default: |
1127 |
|
1128 |
conn->bytes_read++; |
1129 |
|
1130 |
if(conn->bytes_read >= max_read) |
1131 |
{ |
1132 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_ERROR, OPM_ERR_MAX_READ); |
1133 |
conn->state = OPM_STATE_CLOSED; |
1134 |
return; |
1135 |
} |
1136 |
|
1137 |
if(c == '\0' || c == '\r') |
1138 |
continue; |
1139 |
|
1140 |
if(c == '\n') |
1141 |
{ |
1142 |
conn->readbuf[conn->readlen] = '\0'; |
1143 |
conn->readlen = 0; |
1144 |
libopm_do_read(scanner, scan, conn); |
1145 |
|
1146 |
if(conn->state == OPM_STATE_CLOSED) |
1147 |
return; |
1148 |
|
1149 |
continue; |
1150 |
} |
1151 |
|
1152 |
if(conn->readlen < READBUFLEN) |
1153 |
{ /* -1 to pad for null term */ |
1154 |
conn->readbuf[++(conn->readlen) - 1] = c; |
1155 |
} |
1156 |
} |
1157 |
} |
1158 |
} |
1159 |
|
1160 |
/* do_read |
1161 |
* |
1162 |
* A line of data has been read from the socket, check it against |
1163 |
* target string. |
1164 |
* |
1165 |
* |
1166 |
* |
1167 |
* Parameters: |
1168 |
* scanner: Scanner doing the scan |
1169 |
* scan: Specific scan |
1170 |
* conn: Specific connection in the scan |
1171 |
* |
1172 |
* Return: |
1173 |
* None |
1174 |
*/ |
1175 |
static void |
1176 |
libopm_do_read(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1177 |
{ |
1178 |
OPM_LIST_T *list; |
1179 |
OPM_NODE_T *node; |
1180 |
char *target_string; |
1181 |
|
1182 |
/* Check readbuf against target strings */ |
1183 |
list = (OPM_LIST_T *)libopm_config(scanner->config, OPM_CONFIG_TARGET_STRING); |
1184 |
|
1185 |
LIST_FOREACH(node, list->head) |
1186 |
{ |
1187 |
target_string = node->data; |
1188 |
|
1189 |
if (strstr(conn->readbuf, target_string)) |
1190 |
{ |
1191 |
libopm_do_openproxy(scanner, scan, conn); |
1192 |
break; |
1193 |
} |
1194 |
} |
1195 |
} |
1196 |
|
1197 |
/* do_openproxy |
1198 |
* |
1199 |
* An open proxy was found on connection conn. Cleanup the connection and |
1200 |
* call the appropriate callback to let the client know the proxy was found. |
1201 |
* |
1202 |
* Parameters: |
1203 |
* scanner: Scanner doing the scan |
1204 |
* scan: Specific scan |
1205 |
* conn: Specific connection in the scan |
1206 |
* |
1207 |
* Return: |
1208 |
* None |
1209 |
*/ |
1210 |
static void |
1211 |
libopm_do_openproxy(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1212 |
{ |
1213 |
OPM_REMOTE_T *remote; |
1214 |
|
1215 |
remote = scan->remote; |
1216 |
|
1217 |
/* Mark the connection for close */ |
1218 |
conn->state = OPM_STATE_CLOSED; |
1219 |
|
1220 |
/* Call client's open proxy callback */ |
1221 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_OPENPROXY, 0); |
1222 |
} |
1223 |
|
1224 |
/* do_writeready |
1225 |
* |
1226 |
* Remote connection is write ready, call the specific protocol |
1227 |
* function for writing to this socket. |
1228 |
* |
1229 |
* Parameters: |
1230 |
* scanner: Scanner doing the scan |
1231 |
* scan: Specific scan |
1232 |
* conn: Specific connection in the scan |
1233 |
* |
1234 |
* Return: |
1235 |
* None |
1236 |
*/ |
1237 |
static void |
1238 |
libopm_do_writeready(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1239 |
{ |
1240 |
OPM_PROTOCOL_T *protocol; |
1241 |
|
1242 |
protocol = conn->protocol; |
1243 |
|
1244 |
/* Call write function for specific protocol */ |
1245 |
if (protocol->write_function) |
1246 |
protocol->write_function(scanner, scan, conn); |
1247 |
|
1248 |
/* Flag as NEGSENT so we don't have to send data again*/ |
1249 |
conn->state = OPM_STATE_NEGSENT; |
1250 |
} |
1251 |
|
1252 |
/* do_hup |
1253 |
* |
1254 |
* Connection ended prematurely |
1255 |
* |
1256 |
* Parameters: |
1257 |
* scanner: Scanner doing the scan |
1258 |
* scan: Specific scan |
1259 |
* conn: Specific connection in the scan |
1260 |
* error: OPM_ERR_T containing the error type |
1261 |
* Return: |
1262 |
* None |
1263 |
*/ |
1264 |
static void |
1265 |
libopm_do_hup(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1266 |
{ |
1267 |
OPM_REMOTE_T *remote; |
1268 |
|
1269 |
remote = scan->remote; |
1270 |
|
1271 |
/* Mark the connection for close */ |
1272 |
conn->state = OPM_STATE_CLOSED; |
1273 |
|
1274 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_NEGFAIL, 0); |
1275 |
} |
1276 |
|
1277 |
/* do_callback |
1278 |
* |
1279 |
* Call callback |
1280 |
* |
1281 |
* Parameters: |
1282 |
* scanner: scanner remote is on |
1283 |
* remote: remote callback is for |
1284 |
* type: callback type |
1285 |
* var: optional var passed back (error codes, etc ) |
1286 |
* Return: |
1287 |
* None |
1288 |
*/ |
1289 |
static void |
1290 |
libopm_do_callback(OPM_T *scanner, OPM_REMOTE_T *remote, int type, int var) |
1291 |
{ |
1292 |
/* Callback is out of range */ |
1293 |
if (type < 0 || type >= (CBLEN + 1)) |
1294 |
return; |
1295 |
|
1296 |
if (scanner->callbacks[type].func) |
1297 |
(scanner->callbacks[type].func)(scanner, remote, var, scanner->callbacks[type].data); |
1298 |
} |
1299 |
|
1300 |
/* setup_remote |
1301 |
* |
1302 |
* Setup an OPM_REMOTE_T with information from an OPM_CONNECTION_T |
1303 |
* for callback |
1304 |
* |
1305 |
* Parameters: |
1306 |
* remote, conn |
1307 |
* |
1308 |
* Return: |
1309 |
* remote |
1310 |
*/ |
1311 |
static OPM_REMOTE_T * |
1312 |
libopm_setup_remote(OPM_REMOTE_T *remote, OPM_CONNECTION_T *conn) |
1313 |
{ |
1314 |
remote->port = conn->port; |
1315 |
remote->bytes_read = conn->bytes_read; |
1316 |
remote->protocol = conn->protocol->type; |
1317 |
|
1318 |
return remote; |
1319 |
} |