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 #include <string.h>
00025 
00026 #include "smbios/IMemory.h"
00027 #include "SmbiosImpl.h"
00028 
00029 // message.h should be included last.
00030 #include "smbios/message.h"
00031 
00032 using namespace smbiosLowlevel;
00033 using namespace std;
00034 
00035 #if defined(DEBUG_SMBIOS_STRATEGY)
00036 #   define DCOUT(line) do { cout << line; } while(0)
00037 #   define DCERR(line) do { cerr << line; } while(0)
00038 #else
00039 #   define DCOUT(line) do {} while(0)
00040 #   define DCERR(line) do {} while(0)
00041 #endif
00042 
00043 #if 1
00044 #define EFIVARS_FILE_le266 "/proc/efi/systab"
00045 #define EFIVARS_FILE_gt266 "/sys/firmware/efi/systab"
00046 #else
00047 // for debugging
00048 #define EFIVARS_FILE_le266 "/home/michael_e_brown/cc/libsmbios_proj/libsmbios/foo.txt"
00049 #define EFIVARS_FILE_gt266 "/home/michael_e_brown/cc/libsmbios_proj/libsmbios/foo.txt"
00050 #endif
00051 
00052 namespace smbios
00053 {
00054     // allocates no memory, constructs no objects.
00055     // can raise an exception
00056     void SmbiosLinuxEFIStrategy::getSmbiosTableHeader(smbiosLowlevel::smbios_table_entry_point *table_header, bool strict)
00057     {
00058         ParseExceptionImpl parseException;
00059             parseException.setMessageString(_("EFI support not found"));
00060 
00061         FILE *fh = NULL;
00062         if ( (fh=fopen(EFIVARS_FILE_le266, "r")) == NULL  &&
00063              (fh=fopen(EFIVARS_FILE_gt266, "r")) == NULL)
00064             throw(parseException);
00065 
00066         DCERR("Found EFI systab. Reading offset..." << endl);
00067 
00068         // read lines
00069         char line[256] = {0,};
00070         while(NULL != fgets(line, sizeof(line)-1, fh))
00071         {
00072             char *varName=line;
00073             char *varValue=line;
00074             varValue = strchr(line, '=');
00075             if(!varValue)
00076                 continue;
00077 
00078             *(varValue++) = '\0';
00079             if (0 == strcmp(varName, "SMBIOS"))
00080             {
00081                 // offset is in parent class and locks down header
00082                 // to only search at specified offset
00083                 offset = strtol(varValue, NULL, 0);
00084                 DCERR("Found SMBIOS address: " << hex << offset << "." << endl);
00085             }
00086         }
00087         fclose(fh);
00088 
00089         if(offset)
00090             SmbiosMemoryStrategy::getSmbiosTableHeader(table_header, strict);
00091         else
00092             throw(parseException);
00093 
00094         DCERR("Parsed SMBIOS table." << endl);
00095     }
00096 }

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