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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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|
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/* Do initializations */ |
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if (ip == NULL) |
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return NULL; |
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|
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ret->ip = libopm_xstrdup(ip); |
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|
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ret->port = 0; |
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ret->protocol = 0; |
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ret->bytes_read = 0; |
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ret->data = NULL; |
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|
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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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*/ |
287 |
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. |
297 |
* |
298 |
* Parameters: |
299 |
* scanner: pointer to scanner struct |
300 |
* 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 |
307 |
opm_addtype(OPM_T *scanner, int type, unsigned short int port) |
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{ |
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unsigned int i; |
310 |
|
311 |
OPM_NODE_T *node; |
312 |
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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{ |
316 |
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]; |
320 |
protocol_config->port = port; |
321 |
|
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node = libopm_node_create(protocol_config); |
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libopm_list_add(scanner->protocols, node); |
324 |
|
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return OPM_SUCCESS; |
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} |
327 |
} |
328 |
|
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return OPM_ERR_BADPROTOCOL; |
330 |
} |
331 |
|
332 |
/* opm_remote_addtype |
333 |
* |
334 |
* Add a proxy type and port to the list of protocols |
335 |
* a scanner will use. |
336 |
* |
337 |
* Parameters: |
338 |
* remote: pointer to scanner struct |
339 |
* type: type of proxy to scan (used in hashing to the functions) |
340 |
* port: port this specific type/protocol will scan on |
341 |
* Return: |
342 |
* OPM_SUCCESS: Successful protocol add |
343 |
* OPM_ERR_BADPROTOCOL: Protocol is unknown |
344 |
*/ |
345 |
OPM_ERR_T opm_remote_addtype(OPM_REMOTE_T *remote, int type, unsigned short int port) |
346 |
{ |
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unsigned int i; |
348 |
|
349 |
OPM_NODE_T *node; |
350 |
OPM_PROTOCOL_CONFIG_T *protocol_config; |
351 |
|
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for (i = 0; i < sizeof(OPM_PROTOCOLS) / sizeof(OPM_PROTOCOL_T); i++) |
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{ |
354 |
if (type == OPM_PROTOCOLS[i].type) |
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{ |
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protocol_config = libopm_protocol_config_create(); |
357 |
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(remote->protocols, node); |
362 |
|
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return OPM_SUCCESS; |
364 |
} |
365 |
} |
366 |
|
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return OPM_ERR_BADPROTOCOL; |
368 |
} |
369 |
|
370 |
/* libopm_protocol_create |
371 |
* |
372 |
* Create OPM_PROTOCOL_T struct. |
373 |
* |
374 |
* Parameters: |
375 |
* None |
376 |
* Return: |
377 |
* Pointer to new struct |
378 |
* |
379 |
* XXX - does not appear to be used anywhere? |
380 |
* -grifferz |
381 |
*/ |
382 |
#if 0 |
383 |
static OPM_PROTOCOL_T *libopm_protocol_create(void) |
384 |
{ |
385 |
OPM_PROTOCOL_T *ret; |
386 |
ret = xcalloc(sizeof(OPM_PROTOCOL_T)); |
387 |
|
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ret->type = 0; |
389 |
ret->write_function = NULL; |
390 |
ret->read_function = NULL; |
391 |
|
392 |
return ret; |
393 |
} |
394 |
#endif |
395 |
|
396 |
/* libopm_protocol_free |
397 |
* |
398 |
* Free an OPM_PROTOCOL_T struct. Assume that if |
399 |
* format is not NULL, it is pointed to dynamically |
400 |
* allocated memory and free it. |
401 |
* |
402 |
* Parameters: |
403 |
* protocol: struct to free |
404 |
* |
405 |
* Return: |
406 |
* None |
407 |
* |
408 |
* XXX - apparently no longer used? |
409 |
* -grifferz |
410 |
*/ |
411 |
#if 0 |
412 |
static void |
413 |
libopm_protocol_free(OPM_PROTOCOL_T *protocol) |
414 |
{ |
415 |
MyFree(protocol); |
416 |
} |
417 |
#endif |
418 |
|
419 |
/* libopm_protocol_config_create |
420 |
* |
421 |
* Allocate and return address of a new OPM_PROTOCOL_CONFIG_T |
422 |
* |
423 |
* Parameters: |
424 |
* None |
425 |
* |
426 |
* Return: |
427 |
* Address of new OPM_PROTOCOL_CONFIG_T |
428 |
*/ |
429 |
static OPM_PROTOCOL_CONFIG_T * |
430 |
libopm_protocol_config_create(void) |
431 |
{ |
432 |
OPM_PROTOCOL_CONFIG_T *ret; |
433 |
ret = xcalloc(sizeof *ret); |
434 |
|
435 |
return ret; |
436 |
} |
437 |
|
438 |
/* protocol_config_free |
439 |
* |
440 |
* Free OPM_PROTOCOL_CONFIG_T struct |
441 |
* |
442 |
* Parameters: |
443 |
* protocol: struct to free |
444 |
* |
445 |
* Return: |
446 |
* None |
447 |
*/ |
448 |
static void |
449 |
libopm_protocol_config_free(OPM_PROTOCOL_CONFIG_T *protocol) |
450 |
{ |
451 |
MyFree(protocol); |
452 |
} |
453 |
|
454 |
/* opm_scan |
455 |
* |
456 |
* Scan remote host. The opm_scan function takes an OPM_REMOTE_T |
457 |
* struct, calculates the in_addr of the remote host, and creates |
458 |
* a scan list based on protocols defined in the scanner. |
459 |
* |
460 |
* Parameters: |
461 |
* scanner: Scanner to scan host on |
462 |
* remote: OPM_REMOTE_T defining remote host |
463 |
* |
464 |
* Return: |
465 |
* (to be written) |
466 |
*/ |
467 |
OPM_ERR_T |
468 |
opm_scan(OPM_T *scanner, OPM_REMOTE_T *remote) |
469 |
{ |
470 |
OPM_SCAN_T *scan; /* New scan for OPM_T */ |
471 |
OPM_NODE_T *node; /* Node we'll add scan to when we link it to scans */ |
472 |
unsigned int fd_limit; |
473 |
|
474 |
fd_limit = *(int *)libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT); |
475 |
|
476 |
if (LIST_SIZE(scanner->protocols) == 0 && |
477 |
LIST_SIZE(remote->protocols) == 0) |
478 |
return OPM_ERR_NOPROTOCOLS; |
479 |
|
480 |
scan = libopm_scan_create(scanner, remote); |
481 |
|
482 |
if (inet_pton(AF_INET, remote->ip, &(scan->addr.sa4.sin_addr) ) <= 0) |
483 |
{ |
484 |
libopm_scan_free(scan); |
485 |
return OPM_ERR_BADADDR; |
486 |
} |
487 |
|
488 |
node = libopm_node_create(scan); |
489 |
libopm_list_add(scanner->queue, node); |
490 |
|
491 |
return OPM_SUCCESS; |
492 |
} |
493 |
|
494 |
/* opm_end |
495 |
* |
496 |
* End a scan prematurely. |
497 |
* |
498 |
* Parameters: |
499 |
* scanner: Scanner to end scan on |
500 |
* remote: Pointer to remote struct to search for and end |
501 |
* |
502 |
* Return: |
503 |
* No return. OPM_CALLBACK_END will still be called as normal. |
504 |
*/ |
505 |
void |
506 |
opm_end(OPM_T *scanner, OPM_REMOTE_T *remote) |
507 |
{ |
508 |
OPM_NODE_T *node1, *node2, *next1, *next2; |
509 |
OPM_SCAN_T *scan; |
510 |
OPM_CONNECTION_T *conn; |
511 |
|
512 |
/* End active scans */ |
513 |
opm_endscan(scanner, remote); |
514 |
|
515 |
/* |
516 |
* Secondly remove all traces of it in the queue. Once removed we have to call |
517 |
* OPM_CALLBACK_END |
518 |
*/ |
519 |
LIST_FOREACH_SAFE(node1, next1, scanner->queue->head) |
520 |
{ |
521 |
scan = node1->data; |
522 |
|
523 |
if (scan->remote == remote) |
524 |
{ |
525 |
/* Free all connections */ |
526 |
LIST_FOREACH_SAFE(node2, next2, scan->connections->head) |
527 |
{ |
528 |
conn = node2->data; |
529 |
|
530 |
libopm_list_remove(scan->connections, node2); |
531 |
libopm_connection_free(conn); |
532 |
libopm_node_free(node2); |
533 |
continue; |
534 |
} |
535 |
|
536 |
/* OPM_CALLBACK_END because check_closed normally handles this */ |
537 |
libopm_do_callback(scanner, scan->remote, OPM_CALLBACK_END, 0); |
538 |
|
539 |
/* Free up the scan */ |
540 |
libopm_list_remove(scanner->queue, node1); |
541 |
libopm_scan_free(scan); |
542 |
libopm_node_free(node1); |
543 |
} |
544 |
} |
545 |
} |
546 |
|
547 |
/* opm_endscan |
548 |
* |
549 |
* End a scan prematurely. Only end non-queued scans. This is useful |
550 |
* because it only checks the active scan list (saving time), where |
551 |
* opm_end checks both the scan and the possibly large queue. |
552 |
* |
553 |
* Parameters: |
554 |
* scanner: Scanner to end scan on |
555 |
* remote: Pointer to remote struct to search for and end |
556 |
* |
557 |
* Return: |
558 |
* No return. OPM_CALLBACK_END will still be called as normal. |
559 |
*/ |
560 |
void |
561 |
opm_endscan(OPM_T *scanner, OPM_REMOTE_T *remote) |
562 |
{ |
563 |
OPM_NODE_T *node1, *node2; |
564 |
OPM_SCAN_T *scan; |
565 |
OPM_CONNECTION_T *conn; |
566 |
|
567 |
/* |
568 |
* First check to see if it's in the queue, if it is set all connections closed |
569 |
* Next cycle of libopm_check_closed will take care of the garbage and handle |
570 |
* OPM_CALLBACK_END |
571 |
*/ |
572 |
LIST_FOREACH(node1, scanner->scans->head) |
573 |
{ |
574 |
scan = node1->data; |
575 |
|
576 |
if (scan->remote == remote) |
577 |
{ |
578 |
LIST_FOREACH(node2, scan->connections->head) |
579 |
{ |
580 |
conn = (OPM_CONNECTION_T *) node2->data; |
581 |
conn->state = OPM_STATE_CLOSED; |
582 |
} |
583 |
} |
584 |
} |
585 |
} |
586 |
|
587 |
/* opm_active |
588 |
|
589 |
Return number of scans in a scanner left. |
590 |
|
591 |
Parameters: |
592 |
scanner: Scanner to return active scans on |
593 |
|
594 |
Return: |
595 |
Number of active scans, both queued and active. |
596 |
*/ |
597 |
size_t |
598 |
opm_active(OPM_T *scanner) |
599 |
{ |
600 |
return LIST_SIZE(scanner->queue) + LIST_SIZE(scanner->scans); |
601 |
} |
602 |
|
603 |
/* scan_create |
604 |
* |
605 |
* Create new OPM_SCAN_T struct |
606 |
* |
607 |
* Parameters: |
608 |
* scanner: Scanner the scan is being created for. This |
609 |
* is needed to get information on currently set |
610 |
* protocols/config. |
611 |
* |
612 |
* remote: Remote host this scan will be scanning |
613 |
* |
614 |
* Return |
615 |
* Address of new struct |
616 |
*/ |
617 |
static OPM_SCAN_T * |
618 |
libopm_scan_create(OPM_T *scanner, OPM_REMOTE_T *remote) |
619 |
{ |
620 |
OPM_SCAN_T *ret; |
621 |
OPM_CONNECTION_T *conn; |
622 |
OPM_NODE_T *node, *p; |
623 |
|
624 |
ret = xcalloc(sizeof *ret); |
625 |
|
626 |
ret->remote = remote; |
627 |
ret->connections = libopm_list_create(); |
628 |
|
629 |
/* Setup list of connections, one for each protocol */ |
630 |
LIST_FOREACH(p, scanner->protocols->head) |
631 |
{ |
632 |
conn = libopm_connection_create(); |
633 |
|
634 |
conn->protocol = ((OPM_PROTOCOL_CONFIG_T *) p->data)->type; |
635 |
conn->port = ((OPM_PROTOCOL_CONFIG_T *) p->data)->port; |
636 |
|
637 |
node = libopm_node_create(conn); |
638 |
|
639 |
libopm_list_add(ret->connections, node); |
640 |
} |
641 |
|
642 |
/* |
643 |
* Do the same for any specific protocols the remote struct might be configured with |
644 |
*/ |
645 |
LIST_FOREACH(p, remote->protocols->head) |
646 |
{ |
647 |
conn = libopm_connection_create(); |
648 |
|
649 |
conn->protocol = ((OPM_PROTOCOL_CONFIG_T *) p->data)->type; |
650 |
conn->port = ((OPM_PROTOCOL_CONFIG_T *) p->data)->port; |
651 |
|
652 |
node = libopm_node_create(conn); |
653 |
libopm_list_add(ret->connections, node); |
654 |
} |
655 |
|
656 |
memset(&(ret->addr), 0, sizeof(opm_sockaddr)); |
657 |
return ret; |
658 |
} |
659 |
|
660 |
/* scan_free |
661 |
* |
662 |
* Free and cleanup OPM_SCAN_T struct |
663 |
* |
664 |
* Parametsr: |
665 |
* scan: Scan struct to free |
666 |
* |
667 |
* Return: |
668 |
* None |
669 |
*/ |
670 |
static void |
671 |
libopm_scan_free(OPM_SCAN_T *scan) |
672 |
{ |
673 |
OPM_NODE_T *p, *next; |
674 |
OPM_CONNECTION_T *conn; |
675 |
|
676 |
LIST_FOREACH_SAFE(p, next, scan->connections->head) |
677 |
{ |
678 |
conn = p->data; |
679 |
|
680 |
libopm_connection_free(conn); |
681 |
libopm_list_remove(scan->connections, p); |
682 |
libopm_node_free(p); |
683 |
} |
684 |
|
685 |
libopm_list_free(scan->connections); |
686 |
|
687 |
MyFree(scan); |
688 |
} |
689 |
|
690 |
/* connection_create |
691 |
* |
692 |
* Allocate new OPM_CONNECTION_T |
693 |
* |
694 |
* Parameters: |
695 |
* None |
696 |
* |
697 |
* Return: |
698 |
* Address of new OPM_CONNECTION_T |
699 |
*/ |
700 |
static OPM_CONNECTION_T * |
701 |
libopm_connection_create(void) |
702 |
{ |
703 |
OPM_CONNECTION_T *ret; |
704 |
|
705 |
ret = xcalloc(sizeof *ret); |
706 |
|
707 |
ret->fd = 0; |
708 |
ret->bytes_read = 0; |
709 |
ret->readlen = 0; |
710 |
ret->protocol = 0; |
711 |
ret->port = 0; |
712 |
|
713 |
ret->state = OPM_STATE_UNESTABLISHED; |
714 |
|
715 |
return ret; |
716 |
} |
717 |
|
718 |
/* connection_free |
719 |
* |
720 |
* Free OPM_CONNECTION_T struct |
721 |
* |
722 |
* Parameters: |
723 |
* conn: Address of struct to free |
724 |
* |
725 |
* Return: |
726 |
* None |
727 |
*/ |
728 |
static void |
729 |
libopm_connection_free(OPM_CONNECTION_T *conn) |
730 |
{ |
731 |
MyFree(conn); |
732 |
} |
733 |
|
734 |
/* opm_cycle |
735 |
* |
736 |
* Perform tasks (called by client's loop) |
737 |
* |
738 |
* Parameters: |
739 |
* None |
740 |
* Return: |
741 |
* None |
742 |
*/ |
743 |
void |
744 |
opm_cycle(OPM_T *scanner) |
745 |
{ |
746 |
libopm_check_queue(scanner); /* Move scans from the queue to the live scan list */ |
747 |
libopm_check_establish(scanner); /* Make new connections if possible */ |
748 |
libopm_check_poll(scanner); /* Poll connections for IO and proxy test */ |
749 |
libopm_check_closed(scanner); /* Check for closed or timed out connections */ |
750 |
} |
751 |
|
752 |
/* check_queue |
753 |
* |
754 |
* Move scans from the queue to the live scan list as long as there is |
755 |
* room. |
756 |
* |
757 |
* Parameters: |
758 |
* scanner: Scanner to check queue on |
759 |
* |
760 |
* Return: |
761 |
* None |
762 |
*/ |
763 |
static void |
764 |
libopm_check_queue(OPM_T *scanner) |
765 |
{ |
766 |
OPM_NODE_T *node; |
767 |
OPM_SCAN_T *scan; |
768 |
|
769 |
unsigned int protocols, projected, fd_limit; |
770 |
|
771 |
if(LIST_SIZE(scanner->queue) == 0) |
772 |
return; |
773 |
|
774 |
fd_limit = *(int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT); |
775 |
|
776 |
projected = scanner->fd_use; |
777 |
|
778 |
/* We want to keep the live scan list as small as possible, so only |
779 |
move queued scans to the live list if they will not push above fd_limit */ |
780 |
while(LIST_SIZE(scanner->queue) > 0) |
781 |
{ |
782 |
|
783 |
/* Grab the top scan */ |
784 |
scan = scanner->queue->head->data; |
785 |
protocols = LIST_SIZE(scan->connections); |
786 |
|
787 |
/* Check if it will fit in the live scan list */ |
788 |
if((protocols + projected) > fd_limit) |
789 |
break; |
790 |
|
791 |
/* Scans on the top of the queue were added first, swap the head off the |
792 |
top of the queue and add it to the tail of the live scan list */ |
793 |
node = libopm_list_remove(scanner->queue, scanner->queue->head); |
794 |
libopm_list_add(scanner->scans, node); |
795 |
projected += protocols; |
796 |
} |
797 |
|
798 |
} |
799 |
|
800 |
/* check_establish |
801 |
* |
802 |
* Make new connections if there are free file descriptors and connections |
803 |
* to be made. |
804 |
* |
805 |
* Parameters: |
806 |
* scanner: Scanner to check for establish on |
807 |
* Return: |
808 |
* None |
809 |
*/ |
810 |
static void |
811 |
libopm_check_establish(OPM_T *scanner) |
812 |
{ |
813 |
OPM_NODE_T *node1, *node2; |
814 |
OPM_SCAN_T *scan; |
815 |
OPM_CONNECTION_T *conn; |
816 |
unsigned int fd_limit; |
817 |
|
818 |
if (LIST_SIZE(scanner->scans) == 0) |
819 |
return; |
820 |
|
821 |
fd_limit = *(int *)libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT); |
822 |
|
823 |
if (scanner->fd_use >= fd_limit) |
824 |
return; |
825 |
|
826 |
LIST_FOREACH(node1, scanner->scans->head) |
827 |
{ |
828 |
scan = node1->data; |
829 |
|
830 |
LIST_FOREACH(node2, scan->connections->head) |
831 |
{ |
832 |
/* Only scan if we have free file descriptors */ |
833 |
if (scanner->fd_use >= fd_limit) |
834 |
return; |
835 |
|
836 |
conn = node2->data; |
837 |
|
838 |
if (conn->state == OPM_STATE_UNESTABLISHED) |
839 |
libopm_do_connect(scanner, scan, conn); |
840 |
} |
841 |
} |
842 |
} |
843 |
|
844 |
/* check_closed |
845 |
* |
846 |
* Check for connections which have timed out or are |
847 |
* closed. Connections timed out still need to be closed. |
848 |
* |
849 |
* Remove the connection from the list of connections, free |
850 |
* the connection struct and free the list node. Then if this is |
851 |
* the last connection of the scan, consider the scan completed and |
852 |
* free the scan aswell (and callback that the scan ended). |
853 |
* |
854 |
* Parameters: |
855 |
* scanner: Scanner to check on |
856 |
* Return: |
857 |
* None |
858 |
*/ |
859 |
static void |
860 |
libopm_check_closed(OPM_T *scanner) |
861 |
{ |
862 |
|
863 |
time_t present; |
864 |
OPM_NODE_T *node1, *node2, *next1, *next2; |
865 |
int timeout; |
866 |
|
867 |
OPM_SCAN_T *scan; |
868 |
OPM_CONNECTION_T *conn; |
869 |
|
870 |
if(LIST_SIZE(scanner->scans) == 0) |
871 |
return; |
872 |
|
873 |
time(&present); |
874 |
|
875 |
timeout = *(int *) libopm_config(scanner->config, OPM_CONFIG_TIMEOUT); |
876 |
|
877 |
LIST_FOREACH_SAFE(node1, next1, scanner->scans->head) |
878 |
{ |
879 |
scan = node1->data; |
880 |
LIST_FOREACH_SAFE(node2, next2, scan->connections->head) |
881 |
{ |
882 |
|
883 |
conn = node2->data; |
884 |
|
885 |
if(conn->state == OPM_STATE_CLOSED) |
886 |
{ |
887 |
if(conn->fd > 0) |
888 |
close(conn->fd); |
889 |
|
890 |
scanner->fd_use--; |
891 |
|
892 |
libopm_list_remove(scan->connections, node2); |
893 |
libopm_connection_free(conn); |
894 |
libopm_node_free(node2); |
895 |
continue; |
896 |
} |
897 |
|
898 |
if(((present - conn->creation) >= timeout) && |
899 |
conn->state != OPM_STATE_UNESTABLISHED) |
900 |
{ |
901 |
|
902 |
close(conn->fd); |
903 |
scanner->fd_use--; |
904 |
|
905 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_TIMEOUT, 0); |
906 |
|
907 |
libopm_list_remove(scan->connections, node2); |
908 |
libopm_connection_free(conn); |
909 |
libopm_node_free(node2); |
910 |
|
911 |
continue; |
912 |
} |
913 |
} |
914 |
|
915 |
/* No more connections left in this scan, let the |
916 |
client know the scan has ended, then remove the |
917 |
scan from the scanner, and free it up */ |
918 |
if(LIST_SIZE(scan->connections) == 0) |
919 |
{ |
920 |
libopm_do_callback(scanner, scan->remote, OPM_CALLBACK_END, 0); |
921 |
|
922 |
libopm_list_remove(scanner->scans, node1); |
923 |
libopm_scan_free(scan); |
924 |
libopm_node_free(node1); |
925 |
} |
926 |
} |
927 |
} |
928 |
|
929 |
/* do_connect |
930 |
* |
931 |
* Call socket() and connect() to start a scan. |
932 |
* |
933 |
* Parametsr: |
934 |
* scan: Scan struct containing the connection |
935 |
* conn: Connection to establish |
936 |
* Return: |
937 |
* None |
938 |
*/ |
939 |
static void |
940 |
libopm_do_connect(OPM_T * scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
941 |
{ |
942 |
opm_sockaddr *bind_ip; |
943 |
|
944 |
struct sockaddr_in *addr; /* Outgoing host */ |
945 |
struct sockaddr_in local_addr; /* For binding */ |
946 |
|
947 |
addr = (struct sockaddr_in *) &(scan->addr.sa4); /* Already have the IP in byte format from opm_scan */ |
948 |
|
949 |
addr->sin_family = AF_INET; |
950 |
addr->sin_port = htons(conn->port); |
951 |
|
952 |
|
953 |
bind_ip = (opm_sockaddr *) libopm_config(scanner->config, OPM_CONFIG_BIND_IP); |
954 |
|
955 |
conn->fd = socket(PF_INET, SOCK_STREAM, 0); |
956 |
scanner->fd_use++; /* Increase file descriptor use */ |
957 |
|
958 |
if(conn->fd == -1) |
959 |
{ |
960 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_ERROR, OPM_ERR_NOFD); |
961 |
conn->state = OPM_STATE_CLOSED; |
962 |
return; |
963 |
} |
964 |
|
965 |
if(bind_ip != NULL) |
966 |
{ |
967 |
memset(&local_addr, 0, sizeof(local_addr)); |
968 |
local_addr.sin_addr.s_addr = bind_ip->sa4.sin_addr.s_addr; |
969 |
local_addr.sin_family = AF_INET; |
970 |
local_addr.sin_port = htons(0); |
971 |
|
972 |
if(bind(conn->fd, (struct sockaddr *) &(local_addr), sizeof(local_addr)) == -1) |
973 |
{ |
974 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_ERROR, OPM_ERR_BIND); |
975 |
conn->state = OPM_STATE_CLOSED; |
976 |
return; |
977 |
} |
978 |
} |
979 |
|
980 |
/* Set socket non blocking */ |
981 |
fcntl(conn->fd, F_SETFL, O_NONBLOCK); |
982 |
|
983 |
connect(conn->fd, (struct sockaddr *) addr, sizeof(*addr)); |
984 |
|
985 |
conn->state = OPM_STATE_ESTABLISHED; |
986 |
time(&(conn->creation)); /* Stamp creation time, for timeout */ |
987 |
} |
988 |
|
989 |
/* check_poll |
990 |
* |
991 |
* Check sockets for ready read/write |
992 |
* |
993 |
* Parameters: |
994 |
* scanner: Scanner to isolate check on |
995 |
* Return: |
996 |
* None |
997 |
*/ |
998 |
static void |
999 |
libopm_check_poll(OPM_T *scanner) |
1000 |
{ |
1001 |
OPM_NODE_T *node1, *node2; |
1002 |
OPM_SCAN_T *scan; |
1003 |
OPM_CONNECTION_T *conn; |
1004 |
|
1005 |
static unsigned int ufds_size; |
1006 |
static struct pollfd *ufds = NULL; |
1007 |
|
1008 |
unsigned int size, i; |
1009 |
size = 0; |
1010 |
|
1011 |
/* Grow pollfd array (ufds) as needed */ |
1012 |
if(ufds_size < (*(unsigned int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT))) |
1013 |
{ |
1014 |
MyFree(ufds); |
1015 |
ufds = xcalloc((sizeof *ufds) * (*(unsigned int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT))); |
1016 |
ufds_size = (*(unsigned int *) libopm_config(scanner->config, OPM_CONFIG_FD_LIMIT)); |
1017 |
} |
1018 |
|
1019 |
if(LIST_SIZE(scanner->scans) == 0) |
1020 |
return; |
1021 |
|
1022 |
LIST_FOREACH(node1, scanner->scans->head) |
1023 |
{ |
1024 |
scan = node1->data; |
1025 |
LIST_FOREACH(node2, scan->connections->head) |
1026 |
{ |
1027 |
if(size >= ufds_size) |
1028 |
break; |
1029 |
|
1030 |
conn = node2->data; |
1031 |
|
1032 |
if(conn->state < OPM_STATE_ESTABLISHED || |
1033 |
conn->state == OPM_STATE_CLOSED) |
1034 |
continue; |
1035 |
|
1036 |
ufds[size].events = 0; |
1037 |
ufds[size].revents = 0; |
1038 |
ufds[size].fd = conn->fd; |
1039 |
|
1040 |
/* Check for HUNG UP. */ |
1041 |
ufds[size].events |= POLLHUP; |
1042 |
/* Check for INVALID FD */ |
1043 |
ufds[size].events |= POLLNVAL; |
1044 |
|
1045 |
switch(conn->state) |
1046 |
{ |
1047 |
case OPM_STATE_ESTABLISHED: |
1048 |
ufds[size].events |= POLLOUT; |
1049 |
break; |
1050 |
case OPM_STATE_NEGSENT: |
1051 |
ufds[size].events |= POLLIN; |
1052 |
break; |
1053 |
} |
1054 |
size++; |
1055 |
} |
1056 |
|
1057 |
} |
1058 |
|
1059 |
switch (poll(ufds, size, 0)) |
1060 |
{ |
1061 |
case -1: |
1062 |
/* error in select/poll */ |
1063 |
return; |
1064 |
case 0: |
1065 |
/* Nothing to do */ |
1066 |
return; |
1067 |
/* Pass pointer to connection to handler. */ |
1068 |
} |
1069 |
|
1070 |
LIST_FOREACH(node1, scanner->scans->head) |
1071 |
{ |
1072 |
scan = (OPM_SCAN_T *) node1->data; |
1073 |
|
1074 |
LIST_FOREACH(node2, scan->connections->head) |
1075 |
{ |
1076 |
conn = (OPM_CONNECTION_T *) node2->data; |
1077 |
|
1078 |
for(i = 0; i < size; i++) |
1079 |
{ |
1080 |
if((ufds[i].fd == conn->fd) && (conn->state != OPM_STATE_CLOSED)) |
1081 |
{ |
1082 |
if(ufds[i].revents & POLLIN) |
1083 |
libopm_do_readready(scanner, scan, conn); |
1084 |
if(ufds[i].revents & POLLOUT) |
1085 |
libopm_do_writeready(scanner, scan, conn); |
1086 |
if(ufds[i].revents & POLLHUP) |
1087 |
libopm_do_hup(scanner, scan, conn); |
1088 |
} |
1089 |
} |
1090 |
} |
1091 |
} |
1092 |
} |
1093 |
|
1094 |
/* do_readready |
1095 |
* |
1096 |
* Remote connection is read ready, read the data into a buffer and check it against |
1097 |
* the target_string if neccessary |
1098 |
* |
1099 |
* Parameters: |
1100 |
* scanner: Scanner doing the scan |
1101 |
* scan: Specific scan |
1102 |
* conn: Specific connection in the scan |
1103 |
* |
1104 |
* Return: |
1105 |
* None |
1106 |
*/ |
1107 |
static void |
1108 |
libopm_do_readready(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1109 |
{ |
1110 |
|
1111 |
int max_read; |
1112 |
char c; |
1113 |
|
1114 |
/* If protocol has a specific read function, call that instead of |
1115 |
reading data from here. */ |
1116 |
if(conn->protocol->read_function) |
1117 |
{ |
1118 |
conn->protocol->read_function(scanner, scan, conn); |
1119 |
return; |
1120 |
} |
1121 |
|
1122 |
max_read = *(int *) libopm_config(scanner->config, OPM_CONFIG_MAX_READ); |
1123 |
|
1124 |
while(1) |
1125 |
{ |
1126 |
switch (read(conn->fd, &c, 1)) |
1127 |
{ |
1128 |
case 0: |
1129 |
libopm_do_hup(scanner, scan, conn); |
1130 |
return; |
1131 |
|
1132 |
case -1: |
1133 |
if(errno != EAGAIN) |
1134 |
libopm_do_hup(scanner, scan, conn); |
1135 |
return; |
1136 |
|
1137 |
default: |
1138 |
|
1139 |
conn->bytes_read++; |
1140 |
|
1141 |
if(conn->bytes_read >= max_read) |
1142 |
{ |
1143 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_ERROR, OPM_ERR_MAX_READ); |
1144 |
conn->state = OPM_STATE_CLOSED; |
1145 |
return; |
1146 |
} |
1147 |
|
1148 |
if(c == '\0' || c == '\r') |
1149 |
continue; |
1150 |
|
1151 |
if(c == '\n') |
1152 |
{ |
1153 |
conn->readbuf[conn->readlen] = '\0'; |
1154 |
conn->readlen = 0; |
1155 |
libopm_do_read(scanner, scan, conn); |
1156 |
|
1157 |
if(conn->state == OPM_STATE_CLOSED) |
1158 |
return; |
1159 |
|
1160 |
continue; |
1161 |
} |
1162 |
|
1163 |
if(conn->readlen < READBUFLEN) |
1164 |
{ /* -1 to pad for null term */ |
1165 |
conn->readbuf[++(conn->readlen) - 1] = c; |
1166 |
} |
1167 |
} |
1168 |
} |
1169 |
} |
1170 |
|
1171 |
/* do_read |
1172 |
* |
1173 |
* A line of data has been read from the socket, check it against |
1174 |
* target string. |
1175 |
* |
1176 |
* |
1177 |
* |
1178 |
* Parameters: |
1179 |
* scanner: Scanner doing the scan |
1180 |
* scan: Specific scan |
1181 |
* conn: Specific connection in the scan |
1182 |
* |
1183 |
* Return: |
1184 |
* None |
1185 |
*/ |
1186 |
static void |
1187 |
libopm_do_read(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1188 |
{ |
1189 |
OPM_LIST_T *list; |
1190 |
OPM_NODE_T *node; |
1191 |
char *target_string; |
1192 |
|
1193 |
/* Check readbuf against target strings */ |
1194 |
list = (OPM_LIST_T *)libopm_config(scanner->config, OPM_CONFIG_TARGET_STRING); |
1195 |
|
1196 |
LIST_FOREACH(node, list->head) |
1197 |
{ |
1198 |
target_string = node->data; |
1199 |
|
1200 |
if (strstr(conn->readbuf, target_string)) |
1201 |
{ |
1202 |
libopm_do_openproxy(scanner, scan, conn); |
1203 |
break; |
1204 |
} |
1205 |
} |
1206 |
} |
1207 |
|
1208 |
/* do_openproxy |
1209 |
* |
1210 |
* An open proxy was found on connection conn. Cleanup the connection and |
1211 |
* call the appropriate callback to let the client know the proxy was found. |
1212 |
* |
1213 |
* Parameters: |
1214 |
* scanner: Scanner doing the scan |
1215 |
* scan: Specific scan |
1216 |
* conn: Specific connection in the scan |
1217 |
* |
1218 |
* Return: |
1219 |
* None |
1220 |
*/ |
1221 |
static void |
1222 |
libopm_do_openproxy(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1223 |
{ |
1224 |
OPM_REMOTE_T *remote; |
1225 |
|
1226 |
remote = scan->remote; |
1227 |
|
1228 |
/* Mark the connection for close */ |
1229 |
conn->state = OPM_STATE_CLOSED; |
1230 |
|
1231 |
/* Call client's open proxy callback */ |
1232 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_OPENPROXY, 0); |
1233 |
} |
1234 |
|
1235 |
/* do_writeready |
1236 |
* |
1237 |
* Remote connection is write ready, call the specific protocol |
1238 |
* function for writing to this socket. |
1239 |
* |
1240 |
* Parameters: |
1241 |
* scanner: Scanner doing the scan |
1242 |
* scan: Specific scan |
1243 |
* conn: Specific connection in the scan |
1244 |
* |
1245 |
* Return: |
1246 |
* None |
1247 |
*/ |
1248 |
static void |
1249 |
libopm_do_writeready(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1250 |
{ |
1251 |
OPM_PROTOCOL_T *protocol; |
1252 |
|
1253 |
protocol = conn->protocol; |
1254 |
|
1255 |
/* Call write function for specific protocol */ |
1256 |
if (protocol->write_function) |
1257 |
protocol->write_function(scanner, scan, conn); |
1258 |
|
1259 |
/* Flag as NEGSENT so we don't have to send data again*/ |
1260 |
conn->state = OPM_STATE_NEGSENT; |
1261 |
} |
1262 |
|
1263 |
/* do_hup |
1264 |
* |
1265 |
* Connection ended prematurely |
1266 |
* |
1267 |
* Parameters: |
1268 |
* scanner: Scanner doing the scan |
1269 |
* scan: Specific scan |
1270 |
* conn: Specific connection in the scan |
1271 |
* error: OPM_ERR_T containing the error type |
1272 |
* Return: |
1273 |
* None |
1274 |
*/ |
1275 |
static void |
1276 |
libopm_do_hup(OPM_T *scanner, OPM_SCAN_T *scan, OPM_CONNECTION_T *conn) |
1277 |
{ |
1278 |
OPM_REMOTE_T *remote; |
1279 |
|
1280 |
remote = scan->remote; |
1281 |
|
1282 |
/* Mark the connection for close */ |
1283 |
conn->state = OPM_STATE_CLOSED; |
1284 |
|
1285 |
libopm_do_callback(scanner, libopm_setup_remote(scan->remote, conn), OPM_CALLBACK_NEGFAIL, 0); |
1286 |
} |
1287 |
|
1288 |
/* do_callback |
1289 |
* |
1290 |
* Call callback |
1291 |
* |
1292 |
* Parameters: |
1293 |
* scanner: scanner remote is on |
1294 |
* remote: remote callback is for |
1295 |
* type: callback type |
1296 |
* var: optional var passed back (error codes, etc ) |
1297 |
* Return: |
1298 |
* None |
1299 |
*/ |
1300 |
static void |
1301 |
libopm_do_callback(OPM_T *scanner, OPM_REMOTE_T *remote, int type, int var) |
1302 |
{ |
1303 |
/* Callback is out of range */ |
1304 |
if (type < 0 || type >= (CBLEN + 1)) |
1305 |
return; |
1306 |
|
1307 |
if (scanner->callbacks[type].func) |
1308 |
(scanner->callbacks[type].func)(scanner, remote, var, scanner->callbacks[type].data); |
1309 |
} |
1310 |
|
1311 |
/* setup_remote |
1312 |
* |
1313 |
* Setup an OPM_REMOTE_T with information from an OPM_CONNECTION_T |
1314 |
* for callback |
1315 |
* |
1316 |
* Parameters: |
1317 |
* remote, conn |
1318 |
* |
1319 |
* Return: |
1320 |
* remote |
1321 |
*/ |
1322 |
static OPM_REMOTE_T * |
1323 |
libopm_setup_remote(OPM_REMOTE_T *remote, OPM_CONNECTION_T *conn) |
1324 |
{ |
1325 |
remote->port = conn->port; |
1326 |
remote->bytes_read = conn->bytes_read; |
1327 |
remote->protocol = conn->protocol->type; |
1328 |
|
1329 |
return remote; |
1330 |
} |