diff options
Diffstat (limited to 'src/VBox/NetworkServices/Dhcpd/DhcpOptions.cpp')
| -rw-r--r-- | src/VBox/NetworkServices/Dhcpd/DhcpOptions.cpp | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/src/VBox/NetworkServices/Dhcpd/DhcpOptions.cpp b/src/VBox/NetworkServices/Dhcpd/DhcpOptions.cpp new file mode 100644 index 00000000..d8832f97 --- /dev/null +++ b/src/VBox/NetworkServices/Dhcpd/DhcpOptions.cpp @@ -0,0 +1,515 @@ +/* $Id: DhcpOptions.cpp $ */ +/** @file + * DHCP server - DHCP options + */ + +/* + * Copyright (C) 2017-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include "DhcpdInternal.h" +#include "DhcpOptions.h" +#ifndef IN_VBOXSVC +# include "DhcpMessage.h" +#endif + +#include <iprt/cidr.h> + + +#ifndef IN_VBOXSVC + +optmap_t &operator<<(optmap_t &optmap, DhcpOption *option) +{ + if (option == NULL) + return optmap; + + if (option->present()) + optmap[option->optcode()] = std::shared_ptr<DhcpOption>(option); + else + optmap.erase(option->optcode()); + + return optmap; +} + + +optmap_t &operator<<(optmap_t &optmap, const std::shared_ptr<DhcpOption> &option) +{ + if (!option) + return optmap; + + if (option->present()) + optmap[option->optcode()] = option; + else + optmap.erase(option->optcode()); + + return optmap; +} + +#endif /* !IN_VBOXSVC */ + + +int DhcpOption::encode(octets_t &dst) const +{ + if (!m_fPresent) + return VERR_INVALID_STATE; + + size_t cbOrig = dst.size(); + + append(dst, m_OptCode); + appendLength(dst, 0); /* placeholder */ + + ssize_t cbValue = encodeValue(dst); + if (cbValue < 0 || UINT8_MAX <= cbValue) + { + dst.resize(cbOrig); /* undo */ + return VERR_INVALID_PARAMETER; + } + + dst[cbOrig+1] = (uint8_t)cbValue; + return VINF_SUCCESS; +} + + +/* static */ +const octets_t *DhcpOption::findOption(const rawopts_t &aOptMap, uint8_t aOptCode) +{ + rawopts_t::const_iterator it(aOptMap.find(aOptCode)); + if (it == aOptMap.end()) + return NULL; + + return &it->second; +} + + +int DhcpOption::decode(const rawopts_t &map) +{ + const octets_t *rawopt = DhcpOption::findOption(map, m_OptCode); + if (rawopt == NULL) + return VERR_NOT_FOUND; + + int rc = decodeValue(*rawopt, rawopt->size()); + if (RT_FAILURE(rc)) + return VERR_INVALID_PARAMETER; + + return VINF_SUCCESS; +} + + +#ifndef IN_VBOXSVC +int DhcpOption::decode(const DhcpClientMessage &req) +{ + return decode(req.rawopts()); +} +#endif + + +int DhcpOption::parse1(bool &aValue, const char *pcszValue) +{ + pcszValue = RTStrStripL(pcszValue); + if ( strcmp(pcszValue, "true") == 0 + || strcmp(pcszValue, "1") == 0 + || strcmp(pcszValue, "yes") == 0 + || strcmp(pcszValue, "on") == 0 ) + { + aValue = true; + return VINF_SUCCESS; + } + + if ( strcmp(pcszValue, "false") == 0 + || strcmp(pcszValue, "0") == 0 + || strcmp(pcszValue, "no") == 0 + || strcmp(pcszValue, "off") == 0 ) + { + aValue = false; + return VINF_SUCCESS; + } + + uint8_t bTmp; + int rc = RTStrToUInt8Full(RTStrStripL(pcszValue), 10, &bTmp); + if (rc == VERR_TRAILING_SPACES) + rc = VINF_SUCCESS; + if (RT_SUCCESS(rc)) + aValue = bTmp != 0; + + return rc; +} + + +int DhcpOption::parse1(uint8_t &aValue, const char *pcszValue) +{ + int rc = RTStrToUInt8Full(RTStrStripL(pcszValue), 10, &aValue); + if (rc == VERR_TRAILING_SPACES) + rc = VINF_SUCCESS; + return rc; +} + + +int DhcpOption::parse1(uint16_t &aValue, const char *pcszValue) +{ + int rc = RTStrToUInt16Full(RTStrStripL(pcszValue), 10, &aValue); + + if (rc == VERR_TRAILING_SPACES) + rc = VINF_SUCCESS; + return rc; +} + + +int DhcpOption::parse1(uint32_t &aValue, const char *pcszValue) +{ + int rc = RTStrToUInt32Full(RTStrStripL(pcszValue), 10, &aValue); + + if (rc == VERR_TRAILING_SPACES) + rc = VINF_SUCCESS; + return rc; +} + + +int DhcpOption::parse1(RTNETADDRIPV4 &aValue, const char *pcszValue) +{ + return RTNetStrToIPv4Addr(pcszValue, &aValue); +} + + +int DhcpOption::parse1(DhcpIpv4AddrAndMask &aValue, const char *pcszValue) +{ + return RTCidrStrToIPv4(pcszValue, &aValue.Ipv4, &aValue.Mask); +} + + +template <typename a_Type> +/*static*/ int DhcpOption::parseList(std::vector<a_Type> &aList, const char *pcszValue) +{ + std::vector<a_Type> vecTmp; + + pcszValue = RTStrStripL(pcszValue); + for (;;) + { + /* Assume space, tab, comma or semicolon is used as separator (superset of RTStrStrip): */ + const char *pszNext = strpbrk(pcszValue, " ,;:\t\n\r"); + char szTmp[256]; + if (pszNext) + { + size_t cchToCopy = (size_t)(pszNext - pcszValue); + if (cchToCopy >= sizeof(szTmp)) + return VERR_INVALID_PARAMETER; + memcpy(szTmp, pcszValue, cchToCopy); + szTmp[cchToCopy] = '\0'; + pcszValue = szTmp; + + /* Advance pszNext past the separator character and fluff: */ + char ch; + do + pszNext++; + while ((ch = *pszNext) == ' ' || ch == ':' || ch == ';' || ch == '\t' || ch == '\n' || ch == '\r'); + if (ch == '\0') + pszNext = NULL; + } + + /* Try convert it: */ + a_Type Value; + int rc = DhcpOption::parse1(Value, pcszValue); + if (RT_SUCCESS(rc)) + vecTmp.push_back(Value); + else + return VERR_INVALID_PARAMETER; + + if (pszNext) + pcszValue = pszNext; + else + break; + } + + aList.swap(vecTmp); + return VINF_SUCCESS; + +} + +/** ASSUME that uint8_t means hex byte strings. */ +template <> +/*static*/ int DhcpOption::parseList(std::vector<uint8_t> &aList, const char *pcszValue) +{ + uint8_t abBuf[255]; + size_t cbReturned = 0; + int rc = RTStrConvertHexBytesEx(RTStrStripL(pcszValue), abBuf, sizeof(abBuf), RTSTRCONVERTHEXBYTES_F_SEP_COLON, + NULL, &cbReturned); + if (RT_SUCCESS(rc)) + { + if (rc != VWRN_TRAILING_CHARS) + { + for (size_t i = 0; i < cbReturned; i++) + aList.push_back(abBuf[i]); + rc = VINF_SUCCESS; + } + else + rc = VERR_TRAILING_CHARS; + } + return rc; +} + + + +/* + * XXX: See DHCPServer::encodeOption() + */ +int DhcpOption::parseHex(octets_t &aRawValue, const char *pcszValue) +{ + uint8_t abBuf[255]; + size_t cbReturned = 0; + int rc = RTStrConvertHexBytesEx(RTStrStripL(pcszValue), abBuf, sizeof(abBuf), RTSTRCONVERTHEXBYTES_F_SEP_COLON, + NULL, &cbReturned); + if (RT_SUCCESS(rc)) + { + if (rc != VWRN_TRAILING_CHARS) + { + for (size_t i = 0; i < cbReturned; i++) + aRawValue.push_back(abBuf[i]); + rc = VINF_SUCCESS; + } + else + rc = VERR_TRAILING_CHARS; + } + return rc; +} + + +/*static*/ DhcpOption *DhcpOption::parse(uint8_t aOptCode, int aEnc, const char *pcszValue, int *prc /*= NULL*/) +{ + int rcIgn; + if (!prc) + prc = &rcIgn; + + switch (aEnc) + { + case 0: /* DHCPOptionEncoding_Normal */ + switch (aOptCode) + { +#define HANDLE(a_OptClass) \ + case a_OptClass::optcode: \ + return a_OptClass::parse(pcszValue, prc) + + HANDLE(OptSubnetMask); // 1 + HANDLE(OptTimeOffset); // 2 + HANDLE(OptRouters); // 3 + HANDLE(OptTimeServers); // 4 + HANDLE(OptNameServers); // 5 + HANDLE(OptDNSes); // 6 + HANDLE(OptLogServers); // 7 + HANDLE(OptCookieServers); // 8 + HANDLE(OptLPRServers); // 9 + HANDLE(OptImpressServers); // 10 + HANDLE(OptResourceLocationServers); // 11 + HANDLE(OptHostName); // 12 + HANDLE(OptBootFileSize); // 13 + HANDLE(OptMeritDumpFile); // 14 + HANDLE(OptDomainName); // 15 + HANDLE(OptSwapServer); // 16 + HANDLE(OptRootPath); // 17 + HANDLE(OptExtensionPath); // 18 + HANDLE(OptIPForwarding); // 19 + HANDLE(OptNonLocalSourceRouting); // 20 + HANDLE(OptPolicyFilter); // 21 + HANDLE(OptMaxDgramReassemblySize); // 22 + HANDLE(OptDefaultIPTTL); // 23 + HANDLE(OptPathMTUAgingTimeout); // 24 + HANDLE(OptPathMTUPlateauTable); // 25 + HANDLE(OptInterfaceMTU); // 26 + HANDLE(OptAllSubnetsAreLocal); // 27 + HANDLE(OptBroadcastAddress); // 28 + HANDLE(OptPerformMaskDiscovery); // 29 + HANDLE(OptMaskSupplier); // 30 + HANDLE(OptPerformRouterDiscovery); // 31 + HANDLE(OptRouterSolicitationAddress); // 32 + HANDLE(OptStaticRoute); // 33 + HANDLE(OptTrailerEncapsulation); // 34 + HANDLE(OptARPCacheTimeout); // 35 + HANDLE(OptEthernetEncapsulation); // 36 + HANDLE(OptTCPDefaultTTL); // 37 + HANDLE(OptTCPKeepaliveInterval); // 38 + HANDLE(OptTCPKeepaliveGarbage); // 39 + HANDLE(OptNISDomain); // 40 + HANDLE(OptNISServers); // 41 + HANDLE(OptNTPServers); // 42 + //HANDLE(OptVendorSpecificInfo); // 43 - Only DHCPOptionEncoding_hex + HANDLE(OptNetBIOSNameServers); // 44 + HANDLE(OptNetBIOSDatagramServers); // 45 + HANDLE(OptNetBIOSNodeType); // 46 + //HANDLE(OptNetBIOSScope); // 47 - Only DHCPOptionEncoding_hex + HANDLE(OptXWindowsFontServers); // 48 + HANDLE(OptXWindowsDisplayManager); // 49 +#ifndef IN_VBOXSVC /* Don't allow these in new configs */ + // OptRequestedAddress (50) is client only and not configurable. + HANDLE(OptLeaseTime); // 51 - for historical reasons? Configuable elsewhere now. + // OptOptionOverload (52) is part of the protocol and not configurable. + // OptMessageType (53) is part of the protocol and not configurable. + // OptServerId (54) is the IP address of the server and configurable elsewhere. + // OptParameterRequest (55) is client only and not configurable. + // OptMessage (56) is server failure message and not configurable. + // OptMaxDHCPMessageSize (57) is client only (?) and not configurable. + HANDLE(OptRenewalTime); // 58 - for historical reasons? + HANDLE(OptRebindingTime); // 59 - for historical reasons? + // OptVendorClassId (60) is client only and not configurable. + // OptClientId (61) is client only and not configurable. +#endif + HANDLE(OptNetWareIPDomainName); // 62 + //HANDLE(OptNetWareIPInformation); // 63 - Only DHCPOptionEncoding_hex + HANDLE(OptNISPlusDomain); // 64 + HANDLE(OptNISPlusServers); // 65 + HANDLE(OptTFTPServerName); // 66 - perhaps we should use an alternative way to configure these. + HANDLE(OptBootfileName); // 67 - perhaps we should use an alternative way to configure these. + HANDLE(OptMobileIPHomeAgents); // 68 + HANDLE(OptSMTPServers); // 69 + HANDLE(OptPOP3Servers); // 70 + HANDLE(OptNNTPServers); // 71 + HANDLE(OptWWWServers); // 72 + HANDLE(OptFingerServers); // 73 + HANDLE(OptIRCServers); // 74 + HANDLE(OptStreetTalkServers); // 75 + HANDLE(OptSTDAServers); // 76 + // OptUserClassId (77) is client only and not configurable. + //HANDLE(OptSLPDirectoryAgent); // 78 - Only DHCPOptionEncoding_hex + //HANDLE(OptSLPServiceScope); // 79 - Only DHCPOptionEncoding_hex + // OptRapidCommit (80) is not configurable. + + //HANDLE(OptDomainSearch); // 119 - Only DHCPOptionEncoding_hex + +#undef HANDLE + default: + if (prc) + *prc = VERR_NOT_IMPLEMENTED; + return NULL; + } + break; + + case 1: + return RawOption::parse(aOptCode, pcszValue, prc); + + default: + if (prc) + *prc = VERR_WRONG_TYPE; + return NULL; + } +} + + +/** + * Gets the option name (simply "unknown" if not known) for logging purposes. + */ +/*static*/ const char *DhcpOption::name(uint8_t aOptCode) +{ + switch (aOptCode) + { +#define HANDLE(a_OptClass) \ + case a_OptClass::optcode: \ + return &#a_OptClass[3] + + HANDLE(OptSubnetMask); // 1 + HANDLE(OptTimeOffset); // 2 + HANDLE(OptRouters); // 3 + HANDLE(OptTimeServers); // 4 + HANDLE(OptNameServers); // 5 + HANDLE(OptDNSes); // 6 + HANDLE(OptLogServers); // 7 + HANDLE(OptCookieServers); // 8 + HANDLE(OptLPRServers); // 9 + HANDLE(OptImpressServers); // 10 + HANDLE(OptResourceLocationServers); // 11 + HANDLE(OptHostName); // 12 + HANDLE(OptBootFileSize); // 13 + HANDLE(OptMeritDumpFile); // 14 + HANDLE(OptDomainName); // 15 + HANDLE(OptSwapServer); // 16 + HANDLE(OptRootPath); // 17 + HANDLE(OptExtensionPath); // 18 + HANDLE(OptIPForwarding); // 19 + HANDLE(OptNonLocalSourceRouting); // 20 + HANDLE(OptPolicyFilter); // 21 + HANDLE(OptMaxDgramReassemblySize); // 22 + HANDLE(OptDefaultIPTTL); // 23 + HANDLE(OptPathMTUAgingTimeout); // 24 + HANDLE(OptPathMTUPlateauTable); // 25 + HANDLE(OptInterfaceMTU); // 26 + HANDLE(OptAllSubnetsAreLocal); // 27 + HANDLE(OptBroadcastAddress); // 28 + HANDLE(OptPerformMaskDiscovery); // 29 + HANDLE(OptMaskSupplier); // 30 + HANDLE(OptPerformRouterDiscovery); // 31 + HANDLE(OptRouterSolicitationAddress); // 32 + HANDLE(OptStaticRoute); // 33 + HANDLE(OptTrailerEncapsulation); // 34 + HANDLE(OptARPCacheTimeout); // 35 + HANDLE(OptEthernetEncapsulation); // 36 + HANDLE(OptTCPDefaultTTL); // 37 + HANDLE(OptTCPKeepaliveInterval); // 38 + HANDLE(OptTCPKeepaliveGarbage); // 39 + HANDLE(OptNISDomain); // 40 + HANDLE(OptNISServers); // 41 + HANDLE(OptNTPServers); // 42 + HANDLE(OptVendorSpecificInfo); // 43 + HANDLE(OptNetBIOSNameServers); // 44 + HANDLE(OptNetBIOSDatagramServers); // 45 + HANDLE(OptNetBIOSNodeType); // 46 + HANDLE(OptNetBIOSScope); // 47 + HANDLE(OptXWindowsFontServers); // 48 + HANDLE(OptXWindowsDisplayManager); // 49 + HANDLE(OptRequestedAddress); // 50 + HANDLE(OptLeaseTime); // 51 + //HANDLE(OptOptionOverload); // 52 + HANDLE(OptMessageType); // 53 + HANDLE(OptServerId); // 54 + HANDLE(OptParameterRequest); // 55 + HANDLE(OptMessage); // 56 + HANDLE(OptMaxDHCPMessageSize); // 57 + HANDLE(OptRenewalTime); // 58 + HANDLE(OptRebindingTime); // 59 + HANDLE(OptVendorClassId); // 60 + HANDLE(OptClientId); // 61 + HANDLE(OptNetWareIPDomainName); // 62 + HANDLE(OptNetWareIPInformation); // 63 + HANDLE(OptNISPlusDomain); // 64 + HANDLE(OptNISPlusServers); // 65 + HANDLE(OptTFTPServerName); // 66 + HANDLE(OptBootfileName); // 67 + HANDLE(OptMobileIPHomeAgents); // 68 + HANDLE(OptSMTPServers); // 69 + HANDLE(OptPOP3Servers); // 70 + HANDLE(OptNNTPServers); // 71 + HANDLE(OptWWWServers); // 72 + HANDLE(OptFingerServers); // 73 + HANDLE(OptIRCServers); // 74 + HANDLE(OptStreetTalkServers); // 75 + HANDLE(OptSTDAServers); // 76 + HANDLE(OptUserClassId); // 77 + HANDLE(OptSLPDirectoryAgent); // 78 - Only DHCPOptionEncoding_hex + HANDLE(OptSLPServiceScope); // 79 - Only DHCPOptionEncoding_hex + HANDLE(OptRapidCommit); // 80 + + HANDLE(OptDomainSearch); // 119 - Only DHCPOptionEncoding_hex + +#undef HANDLE + default: + return "unknown"; + } +} + |