106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/* $Id$ */
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/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS System VPN */
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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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, see <http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <dlfcn.h>
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#include <sys/socket.h>
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#include <System.h>
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#include <System/App.h>
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#include "../src/common.c"
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/* libVPN */
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/* private */
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/* types */
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typedef struct _VPNSocket
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{
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int fd;
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} VPNSocket;
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/* constants */
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#define PROGNAME "libVPN"
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#define VPN_OFFSET 1024
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/* variables */
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static AppClient * _appclient = NULL;
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/* local functions */
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static int (*old_connect)(int fd, const struct sockaddr * name,
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socklen_t namelen);
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/* prototypes */
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static void _libvpn_init(void);
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/* functions */
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static void _libvpn_init(void)
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{
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static void * hdl = NULL;
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/* FIXME some symbols may be in libsocket.so instead */
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static char * libc[] = { "/lib/libc.so", "/lib/libc.so.6" };
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size_t i;
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if(hdl != NULL)
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return;
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for(i = 0; i < sizeof(libc) / sizeof(*libc); i++)
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if((hdl = dlopen(libc[i], RTLD_LAZY)) != NULL)
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break;
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if(hdl == NULL)
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{
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fprintf(stderr, "%s: %s\n", PROGNAME, dlerror());
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exit(1);
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}
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if((old_connect = dlsym(hdl, "connect")) == NULL)
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{
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fprintf(stderr, "%s: %s\n", PROGNAME, dlerror());
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dlclose(hdl);
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exit(1);
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}
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dlclose(hdl);
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if((_appclient = appclient_new("VPN")) == NULL)
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{
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error_print(PROGNAME);
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exit(1);
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}
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}
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/* public */
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/* interface */
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/* connect */
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int connect(int fd, const struct sockaddr * name, socklen_t namelen)
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{
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int ret;
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_libvpn_init();
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if(fd < VPN_OFFSET)
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return old_connect(fd, name, namelen);
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if(appclient_call(_appclient, &ret, "connect", fd - VPN_OFFSET) != 0)
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return -1;
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#ifdef DEBUG
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fprintf(stderr, "DEBUG: connect(%d) => %d\n", fd - VFS_OFFSET, ret);
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#endif
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if(ret != 0)
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return _vpn_errno(_vpn_error, _vpn_error_cnt, -ret, 1);
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return ret;
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}
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