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SmbiosStrategy_Linux.cpp

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00001 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
00002  * vim:expandtab:autoindent:tabstop=4:shiftwidth=4:filetype=c:cindent:textwidth=0:
00003  *
00004  * Copyright (C) 2005 Dell Inc.
00005  *  by Michael Brown <Michael_E_Brown@dell.com>
00006  * Licensed under the Open Software License version 2.1
00007  *
00008  * Alternatively, you can redistribute it and/or modify
00009  * it under the terms of the GNU General Public License as published
00010  * by the Free Software Foundation; either version 2 of the License,
00011  * or (at your option) any later version.
00012 
00013  * This program is distributed in the hope that it will be useful, but
00014  * WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00016  * See the GNU General Public License for more details.
00017  */
00018 
00019 // compat header should always be first header if including system headers
00020 #define LIBSMBIOS_SOURCE
00021 #include "smbios/compat.h"
00022 
00023 #include <sstream>
00024 
00025 #include "smbios/IMemory.h"
00026 #include "SmbiosImpl.h"
00027 
00028 // message.h should be included last.
00029 #include "smbios/message.h"
00030 
00031 using namespace smbiosLowlevel;
00032 using namespace std;
00033 
00034 #if defined(DEBUG_SMBIOS_STRATEGY)
00035 #   define DCOUT(line) do { cout << line; } while(0)
00036 #   define DCERR(line) do { cerr << line; } while(0)
00037 #else
00038 #   define DCOUT(line) do {} while(0)
00039 #   define DCERR(line) do {} while(0)
00040 #endif
00041 
00042 #if 1
00043 #define EFIVARS_FILE_le266 "/proc/efi/systab"
00044 #define EFIVARS_FILE_gt266 "/sys/firmware/efi/systab"
00045 #else
00046 // for debugging
00047 #define EFIVARS_FILE_le266 "/home/michael_e_brown/cc/libsmbios_proj/libsmbios/foo.txt"
00048 #define EFIVARS_FILE_gt266 "/home/michael_e_brown/cc/libsmbios_proj/libsmbios/foo.txt"
00049 #endif
00050 
00051 namespace smbios
00052 {
00053     // allocates no memory, constructs no objects.
00054     // can raise an exception
00055     void SmbiosLinuxEFIStrategy::getSmbiosTableHeader(smbiosLowlevel::smbios_table_entry_point *table_header, bool strict)
00056     {
00057         ParseExceptionImpl parseException;
00058             parseException.setMessageString(_("EFI support not found"));
00059 
00060         FILE *fh = NULL;
00061         if ( (fh=fopen(EFIVARS_FILE_le266, "r")) == NULL  &&
00062              (fh=fopen(EFIVARS_FILE_gt266, "r")) == NULL)
00063             throw(parseException);
00064 
00065         DCERR("Found EFI systab. Reading offset..." << endl);
00066 
00067         // read lines
00068         char line[256] = {0,};
00069         while(NULL != fgets(line, sizeof(line)-1, fh))
00070         {
00071             char *varName=line;
00072             char *varValue=line;
00073             varValue = strchr(line, '=');
00074             if(!varValue)
00075                 continue;
00076 
00077             *(varValue++) = '\0';
00078             if (0 == strcmp(varName, "SMBIOS"))
00079             {
00080                 // offset is in parent class and locks down header
00081                 // to only search at specified offset
00082                 offset = strtol(varValue, NULL, 0);
00083                 DCERR("Found SMBIOS address: " << hex << offset << "." << endl);
00084             }
00085         }
00086         fclose(fh);
00087 
00088         if(offset)
00089             SmbiosMemoryStrategy::getSmbiosTableHeader(table_header, strict);
00090         else
00091             throw(parseException);
00092 
00093         DCERR("Parsed SMBIOS table." << endl);
00094     }
00095 }

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