1 | /* $Id: VBoxNetDhcpd.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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2 | /** @file
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3 | * VBoxNetDhcpd - DHCP server for host-only and NAT networks.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2009-2024 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 |
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28 |
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29 | /** @page pg_net_dhcp VBoxNetDHCP
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30 | *
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31 | * Write a few words...
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32 | *
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33 | */
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34 |
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35 |
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36 | /*********************************************************************************************************************************
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37 | * Header Files *
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38 | *********************************************************************************************************************************/
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39 | #include <iprt/cdefs.h>
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40 |
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41 | /*
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42 | * Need to get host/network order conversion stuff from Windows headers,
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43 | * so we do not define them in LWIP and then try to re-define them in
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44 | * Windows headers.
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45 | */
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46 | #ifdef RT_OS_WINDOWS
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47 | # include <iprt/win/winsock2.h>
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48 | #endif
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49 |
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50 | #include "DhcpdInternal.h"
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51 | #include <iprt/param.h>
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52 | #include <iprt/errcore.h>
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53 |
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54 | #include <iprt/initterm.h>
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55 | #include <iprt/message.h>
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56 |
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57 | #include <iprt/net.h>
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58 | #include <iprt/path.h>
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59 | #include <iprt/stream.h>
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60 |
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61 | #include <VBox/sup.h>
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62 | #include <VBox/vmm/vmm.h>
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63 | #include <VBox/vmm/pdmnetinline.h>
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64 | #include <VBox/intnet.h>
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65 | #include <VBox/intnetinline.h>
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66 |
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67 | #include "VBoxLwipCore.h"
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68 | #include "Config.h"
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69 | #include "DHCPD.h"
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70 | #include "DhcpMessage.h"
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71 |
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72 | extern "C"
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73 | {
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74 | #include "lwip/sys.h"
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75 | #include "lwip/pbuf.h"
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76 | #include "lwip/netif.h"
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77 | #include "lwip/tcpip.h"
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78 | #include "lwip/udp.h"
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79 | #include "netif/etharp.h"
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80 | }
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81 |
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82 | #include <iprt/sanitized/string>
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83 | #include <vector>
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84 | #include <memory>
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85 |
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86 | #ifdef RT_OS_WINDOWS
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87 | # include <iprt/win/windows.h>
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88 | #endif
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89 |
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90 | #include "IntNetIf.h"
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91 |
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92 | struct delete_pbuf
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93 | {
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94 | delete_pbuf() {}
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95 | void operator()(struct pbuf *p) const { pbuf_free(p); }
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96 | };
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97 |
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98 | typedef std::unique_ptr<pbuf, delete_pbuf> unique_ptr_pbuf;
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99 |
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100 |
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101 | class VBoxNetDhcpd
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102 | {
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103 | DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(VBoxNetDhcpd);
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104 | public:
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105 | VBoxNetDhcpd();
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106 | ~VBoxNetDhcpd();
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107 |
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108 | int main(int argc, char **argv);
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109 |
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110 | private:
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111 | /** The logger instance. */
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112 | PRTLOGGER m_pStderrReleaseLogger;
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113 | /** Internal network interface handle. */
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114 | INTNETIFCTX m_hIf;
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115 | /** lwip stack connected to the intnet */
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116 | struct netif m_LwipNetif;
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117 | /** The DHCP server config. */
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118 | Config *m_Config;
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119 | /** Listening pcb */
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120 | struct udp_pcb *m_Dhcp4Pcb;
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121 | /** DHCP server instance. */
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122 | DHCPD m_server;
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123 |
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124 | int logInitStderr();
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125 |
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126 | /*
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127 | * Internal network plumbing.
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128 | */
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129 | int ifInit(const RTCString &strNetwork,
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130 | const RTCString &strTrunk = RTCString(),
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131 | INTNETTRUNKTYPE enmTrunkType = kIntNetTrunkType_WhateverNone);
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132 |
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133 | static DECLCALLBACK(void) ifInput(void *pvUser, void *pvFrame, uint32_t cbFrame);
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134 | void ifInputWorker(void *pvFrame, uint32_t cbFrame);
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135 |
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136 | /*
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137 | * lwIP callbacks
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138 | */
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139 | static DECLCALLBACK(void) lwipInitCB(void *pvArg);
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140 | void lwipInit();
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141 |
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142 | static err_t netifInitCB(netif *pNetif) RT_NOTHROW_PROTO;
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143 | err_t netifInit(netif *pNetif);
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144 |
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145 | static err_t netifLinkOutputCB(netif *pNetif, pbuf *pPBuf) RT_NOTHROW_PROTO;
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146 | err_t netifLinkOutput(pbuf *pPBuf);
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147 |
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148 | static void dhcp4RecvCB(void *arg, struct udp_pcb *pcb, struct pbuf *p,
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149 | ip_addr_t *addr, u16_t port) RT_NOTHROW_PROTO;
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150 | void dhcp4Recv(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
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151 | };
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152 |
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153 |
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154 | VBoxNetDhcpd::VBoxNetDhcpd()
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155 | : m_pStderrReleaseLogger(NULL),
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156 | m_hIf(NULL),
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157 | m_LwipNetif(),
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158 | m_Config(NULL),
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159 | m_Dhcp4Pcb(NULL)
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160 | {
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161 | logInitStderr();
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162 | }
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163 |
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164 |
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165 | VBoxNetDhcpd::~VBoxNetDhcpd()
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166 | {
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167 | if (m_hIf != NULL)
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168 | {
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169 | int rc = IntNetR3IfDestroy(m_hIf);
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170 | AssertRC(rc);
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171 | m_hIf = NULL;
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172 | }
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173 | }
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174 |
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175 |
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176 | /*
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177 | * We don't know the name of the release log file until we parse our
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178 | * configuration because we use network name as basename. To get
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179 | * early logging to work, start with stderr-only release logger.
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180 | *
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181 | * We disable "sup" for this logger to avoid spam from SUPR3Init().
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182 | */
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183 | int VBoxNetDhcpd::logInitStderr()
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184 | {
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185 | static const char * const s_apszGroups[] = VBOX_LOGGROUP_NAMES;
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186 |
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187 | uint32_t fFlags = 0;
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188 | #if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
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189 | fFlags |= RTLOGFLAGS_USECRLF;
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190 | #endif
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191 |
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192 | PRTLOGGER pLogger;
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193 | int rc = RTLogCreate(&pLogger, fFlags,
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194 | "all -sup all.restrict -default.restrict",
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195 | NULL, /* environment base */
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196 | RT_ELEMENTS(s_apszGroups), s_apszGroups,
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197 | RTLOGDEST_STDERR, NULL);
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198 | if (RT_FAILURE(rc))
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199 | {
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200 | RTPrintf("Failed to init stderr logger: %Rrs\n", rc);
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201 | return rc;
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202 | }
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203 |
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204 | m_pStderrReleaseLogger = pLogger;
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205 | RTLogRelSetDefaultInstance(m_pStderrReleaseLogger);
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206 |
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207 | return VINF_SUCCESS;
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208 | }
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209 |
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210 |
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211 | int VBoxNetDhcpd::ifInit(const RTCString &strNetwork,
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212 | const RTCString &strTrunk,
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213 | INTNETTRUNKTYPE enmTrunkType)
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214 | {
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215 | if (enmTrunkType == kIntNetTrunkType_Invalid)
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216 | enmTrunkType = kIntNetTrunkType_WhateverNone;
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217 |
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218 | int rc = IntNetR3IfCreateEx(&m_hIf, strNetwork.c_str(), enmTrunkType,
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219 | strTrunk.c_str(), _128K /*cbSend*/, _256K /*cbRecv*/,
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220 | 0 /*fFlags*/);
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221 | if (RT_SUCCESS(rc))
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222 | rc = IntNetR3IfSetActive(m_hIf, true /*fActive*/);
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223 |
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224 | return rc;
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225 | }
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226 |
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227 |
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228 | void VBoxNetDhcpd::ifInputWorker(void *pvFrame, uint32_t cbFrame)
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229 | {
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230 | struct pbuf *p = pbuf_alloc(PBUF_RAW, (u16_t)cbFrame + ETH_PAD_SIZE, PBUF_POOL);
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231 | AssertPtrReturnVoid(p);
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232 |
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233 | /*
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234 | * The code below is inlined version of:
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235 | *
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236 | * pbuf_header(p, -ETH_PAD_SIZE); // hide padding
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237 | * pbuf_take(p, pvFrame, cbFrame);
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238 | * pbuf_header(p, ETH_PAD_SIZE); // reveal padding
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239 | */
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240 | struct pbuf *q = p;
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241 | uint8_t *pbChunk = (uint8_t *)pvFrame;
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242 | do
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243 | {
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244 | uint8_t *payload = (uint8_t *)q->payload;
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245 | size_t len = q->len;
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246 |
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247 | #if ETH_PAD_SIZE
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248 | if (RT_LIKELY(q == p)) /* single pbuf is large enough */
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249 | {
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250 | payload += ETH_PAD_SIZE;
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251 | len -= ETH_PAD_SIZE;
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252 | }
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253 | #endif
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254 | memcpy(payload, pbChunk, len);
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255 | pbChunk += len;
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256 | q = q->next;
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257 | } while (RT_UNLIKELY(q != NULL));
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258 |
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259 | m_LwipNetif.input(p, &m_LwipNetif);
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260 | }
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261 |
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262 |
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263 | /**
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264 | * Got a frame from the internal network, feed it to the lwIP stack.
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265 | */
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266 | /*static*/
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267 | DECLCALLBACK(void) VBoxNetDhcpd::ifInput(void *pvUser, void *pvFrame, uint32_t cbFrame)
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268 | {
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269 | AssertReturnVoid(pvFrame);
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270 | AssertReturnVoid( cbFrame > sizeof(RTNETETHERHDR)
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271 | && cbFrame <= UINT16_MAX - ETH_PAD_SIZE);
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272 |
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273 | VBoxNetDhcpd *self = static_cast<VBoxNetDhcpd *>(pvUser);
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274 | self->ifInputWorker(pvFrame, cbFrame);
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275 | }
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276 |
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277 |
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278 | /**
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279 | * Got a frame from the lwIP stack, feed it to the internal network.
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280 | */
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281 | err_t VBoxNetDhcpd::netifLinkOutput(pbuf *pPBuf)
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282 | {
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283 | if (pPBuf->tot_len < sizeof(struct eth_hdr)) /* includes ETH_PAD_SIZE */
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284 | return ERR_ARG;
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285 |
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286 | u16_t cbFrame = pPBuf->tot_len - ETH_PAD_SIZE;
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287 | INTNETFRAME Frame;
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288 | int rc = IntNetR3IfQueryOutputFrame(m_hIf, cbFrame, &Frame);
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289 | if (RT_FAILURE(rc))
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290 | return ERR_MEM;
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291 |
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292 | pbuf_copy_partial(pPBuf, Frame.pvFrame, cbFrame, ETH_PAD_SIZE);
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293 | IntNetR3IfOutputFrameCommit(m_hIf, &Frame);
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294 | return ERR_OK;
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295 | }
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296 |
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297 |
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298 | /* static */ DECLCALLBACK(void) VBoxNetDhcpd::lwipInitCB(void *pvArg)
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299 | {
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300 | AssertPtrReturnVoid(pvArg);
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301 |
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302 | VBoxNetDhcpd *self = static_cast<VBoxNetDhcpd *>(pvArg);
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303 | self->lwipInit();
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304 | }
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305 |
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306 |
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307 | /* static */ err_t VBoxNetDhcpd::netifInitCB(netif *pNetif) RT_NOTHROW_DEF
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308 | {
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309 | AssertPtrReturn(pNetif, ERR_ARG);
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310 |
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311 | VBoxNetDhcpd *self = static_cast<VBoxNetDhcpd *>(pNetif->state);
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312 | return self->netifInit(pNetif);
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313 | }
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314 |
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315 |
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316 | /* static */ err_t VBoxNetDhcpd::netifLinkOutputCB(netif *pNetif, pbuf *pPBuf) RT_NOTHROW_DEF
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317 | {
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318 | AssertPtrReturn(pNetif, ERR_ARG);
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319 | AssertPtrReturn(pPBuf, ERR_ARG);
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320 |
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321 | VBoxNetDhcpd *self = static_cast<VBoxNetDhcpd *>(pNetif->state);
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322 | AssertPtrReturn(self, ERR_IF);
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323 |
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324 | return self->netifLinkOutput(pPBuf);
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325 | }
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326 |
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327 |
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328 | /* static */ void VBoxNetDhcpd::dhcp4RecvCB(void *arg, struct udp_pcb *pcb,
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329 | struct pbuf *p,
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330 | ip_addr_t *addr, u16_t port) RT_NOTHROW_DEF
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331 | {
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332 | AssertPtrReturnVoid(arg);
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333 |
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334 | VBoxNetDhcpd *self = static_cast<VBoxNetDhcpd *>(arg);
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335 | self->dhcp4Recv(pcb, p, addr, port);
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336 | pbuf_free(p);
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337 | }
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338 |
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339 |
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340 |
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341 |
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342 |
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343 | int VBoxNetDhcpd::main(int argc, char **argv)
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344 | {
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345 | /*
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346 | * Register string format types.
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347 | */
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348 | ClientId::registerFormat();
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349 | Binding::registerFormat();
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350 |
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351 | /*
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352 | * Parse the command line into a configuration object.
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353 | */
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354 | m_Config = Config::create(argc, argv);
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355 | if (m_Config == NULL)
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356 | return VERR_GENERAL_FAILURE;
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357 |
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358 | /*
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359 | * Initialize the server.
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360 | */
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361 | int rc = m_server.init(m_Config);
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362 | if (RT_SUCCESS(rc))
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363 | {
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364 | /* connect to the intnet */
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365 | rc = ifInit(m_Config->getNetwork(), m_Config->getTrunk(), m_Config->getTrunkType());
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366 | if (RT_SUCCESS(rc))
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367 | {
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368 | /* setup lwip */
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369 | rc = vboxLwipCoreInitialize(lwipInitCB, this);
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370 | if (RT_SUCCESS(rc))
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371 | {
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372 | /*
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373 | * Pump packets more or less for ever.
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374 | */
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375 | rc = IntNetR3IfPumpPkts(m_hIf, ifInput, this,
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376 | NULL /*pfnInputGso*/, NULL /*pvUserGso*/);
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377 | }
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378 | else
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379 | DHCP_LOG_MSG_ERROR(("Terminating - vboxLwipCoreInitialize failed: %Rrc\n", rc));
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380 | }
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381 | else
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382 | DHCP_LOG_MSG_ERROR(("Terminating - ifInit failed: %Rrc\n", rc));
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383 | }
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384 | else
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385 | DHCP_LOG_MSG_ERROR(("Terminating - Dhcpd::init failed: %Rrc\n", rc));
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386 | return rc;
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387 | }
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388 |
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389 |
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390 | void VBoxNetDhcpd::lwipInit()
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391 | {
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392 | err_t error;
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393 |
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394 | ip_addr_t addr, mask;
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395 | ip4_addr_set_u32(&addr, m_Config->getIPv4Address().u);
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396 | ip4_addr_set_u32(&mask, m_Config->getIPv4Netmask().u);
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397 |
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398 | netif *pNetif = netif_add(&m_LwipNetif,
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399 | &addr, &mask,
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400 | IP_ADDR_ANY, /* gateway */
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401 | this, /* state */
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402 | VBoxNetDhcpd::netifInitCB, /* netif_init_fn */
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403 | tcpip_input); /* netif_input_fn */
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404 | if (pNetif == NULL)
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405 | return;
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406 |
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407 | netif_set_up(pNetif);
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408 | netif_set_link_up(pNetif);
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409 |
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410 | m_Dhcp4Pcb = udp_new();
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411 | if (RT_UNLIKELY(m_Dhcp4Pcb == NULL))
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412 | return; /* XXX? */
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413 |
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414 | ip_set_option(m_Dhcp4Pcb, SOF_BROADCAST);
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415 | udp_recv(m_Dhcp4Pcb, dhcp4RecvCB, this);
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416 |
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417 | error = udp_bind(m_Dhcp4Pcb, IP_ADDR_ANY, RTNETIPV4_PORT_BOOTPS);
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418 | if (error != ERR_OK)
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419 | {
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420 | udp_remove(m_Dhcp4Pcb);
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421 | m_Dhcp4Pcb = NULL;
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422 | return; /* XXX? */
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423 | }
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424 | }
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425 |
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426 |
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427 | err_t VBoxNetDhcpd::netifInit(netif *pNetif)
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428 | {
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429 | pNetif->hwaddr_len = sizeof(RTMAC);
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430 | memcpy(pNetif->hwaddr, &m_Config->getMacAddress(), sizeof(RTMAC));
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431 |
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432 | pNetif->mtu = 1500;
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433 |
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434 | pNetif->flags = NETIF_FLAG_BROADCAST
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435 | | NETIF_FLAG_ETHARP
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436 | | NETIF_FLAG_ETHERNET;
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437 |
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438 | pNetif->linkoutput = netifLinkOutputCB;
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439 | pNetif->output = etharp_output;
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440 |
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441 | netif_set_default(pNetif);
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442 | return ERR_OK;
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443 | }
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444 |
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445 |
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446 | void VBoxNetDhcpd::dhcp4Recv(struct udp_pcb *pcb, struct pbuf *p,
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447 | ip_addr_t *addr, u16_t port)
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448 | {
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449 | RT_NOREF(pcb, addr, port);
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450 |
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451 | if (RT_UNLIKELY(p->next != NULL))
|
---|
452 | return; /* XXX: we want it in one chunk */
|
---|
453 |
|
---|
454 | bool broadcasted = ip_addr_cmp(ip_current_dest_addr(), &ip_addr_broadcast)
|
---|
455 | || ip_addr_cmp(ip_current_dest_addr(), &ip_addr_any);
|
---|
456 |
|
---|
457 | try
|
---|
458 | {
|
---|
459 | DhcpClientMessage *msgIn = DhcpClientMessage::parse(broadcasted, p->payload, p->len);
|
---|
460 | if (msgIn == NULL)
|
---|
461 | return;
|
---|
462 |
|
---|
463 | std::unique_ptr<DhcpClientMessage> autoFreeMsgIn(msgIn);
|
---|
464 |
|
---|
465 | DhcpServerMessage *msgOut = m_server.process(*msgIn);
|
---|
466 | if (msgOut == NULL)
|
---|
467 | return;
|
---|
468 |
|
---|
469 | std::unique_ptr<DhcpServerMessage> autoFreeMsgOut(msgOut);
|
---|
470 |
|
---|
471 | ip_addr_t dst = { msgOut->dst().u };
|
---|
472 | if (ip_addr_cmp(&dst, &ip_addr_any))
|
---|
473 | ip_addr_copy(dst, ip_addr_broadcast);
|
---|
474 |
|
---|
475 | octets_t data;
|
---|
476 | int rc = msgOut->encode(data);
|
---|
477 | if (RT_FAILURE(rc))
|
---|
478 | return;
|
---|
479 |
|
---|
480 | unique_ptr_pbuf q ( pbuf_alloc(PBUF_RAW, (u16_t)data.size(), PBUF_RAM) );
|
---|
481 | if (!q)
|
---|
482 | return;
|
---|
483 |
|
---|
484 | err_t error = pbuf_take(q.get(), &data.front(), (u16_t)data.size());
|
---|
485 | if (error != ERR_OK)
|
---|
486 | return;
|
---|
487 |
|
---|
488 | error = udp_sendto(pcb, q.get(), &dst, RTNETIPV4_PORT_BOOTPC);
|
---|
489 | if (error != ERR_OK)
|
---|
490 | return;
|
---|
491 | }
|
---|
492 | catch (std::bad_alloc &)
|
---|
493 | {
|
---|
494 | LogRel(("VBoxNetDhcpd::dhcp4Recv: Caught std::bad_alloc!\n"));
|
---|
495 | }
|
---|
496 | }
|
---|
497 |
|
---|
498 |
|
---|
499 |
|
---|
500 |
|
---|
501 | /*
|
---|
502 | * Entry point.
|
---|
503 | */
|
---|
504 | extern "C" DECLEXPORT(int) TrustedMain(int argc, char **argv)
|
---|
505 | {
|
---|
506 | VBoxNetDhcpd Dhcpd;
|
---|
507 | int rc = Dhcpd.main(argc, argv);
|
---|
508 | return RT_SUCCESS(rc) ? RTEXITCODE_SUCCESS : RTEXITCODE_FAILURE;
|
---|
509 | }
|
---|
510 |
|
---|
511 |
|
---|
512 | #ifndef VBOX_WITH_HARDENING
|
---|
513 |
|
---|
514 | int main(int argc, char **argv)
|
---|
515 | {
|
---|
516 | int rc = RTR3InitExe(argc, &argv, RTR3INIT_FLAGS_SUPLIB);
|
---|
517 | if (RT_SUCCESS(rc))
|
---|
518 | return TrustedMain(argc, argv);
|
---|
519 | return RTMsgInitFailure(rc);
|
---|
520 | }
|
---|
521 |
|
---|
522 |
|
---|
523 | # ifdef RT_OS_WINDOWS
|
---|
524 | /** (We don't want a console usually.) */
|
---|
525 | int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
|
---|
526 | {
|
---|
527 | RT_NOREF(hInstance, hPrevInstance, lpCmdLine, nCmdShow);
|
---|
528 |
|
---|
529 | return main(__argc, __argv);
|
---|
530 | }
|
---|
531 | # endif /* RT_OS_WINDOWS */
|
---|
532 |
|
---|
533 | #endif /* !VBOX_WITH_HARDENING */
|
---|