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annotate packages/net/snmp/agent/current/src/kernel.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 95f3e12a6327
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // ./agent/current/src/kernel.c
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4 //
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5 //
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6 //==========================================================================
208
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7 //####ECOSGPLCOPYRIGHTBEGIN####
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8 // -------------------------------------------
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9 // This file is part of eCos, the Embedded Configurable Operating System.
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10 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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11 //
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12 // eCos is free software; you can redistribute it and/or modify it under
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13 // the terms of the GNU General Public License as published by the Free
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14 // Software Foundation; either version 2 or (at your option) any later version.
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15 //
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16 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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17 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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19 // for more details.
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20 //
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21 // You should have received a copy of the GNU General Public License along
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22 // with eCos; if not, write to the Free Software Foundation, Inc.,
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23 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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24 //
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25 // As a special exception, if other files instantiate templates or use macros
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26 // or inline functions from this file, or you compile this file and link it
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27 // with other works to produce a work based on this file, this file does not
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28 // by itself cause the resulting work to be covered by the GNU General Public
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29 // License. However the source code for this file must still be made available
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30 // in accordance with section (3) of the GNU General Public License.
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31 //
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32 // This exception does not invalidate any other reasons why a work based on
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33 // this file might be covered by the GNU General Public License.
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34 //
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35 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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36 // at http://sources.redhat.com/ecos/ecos-license
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37 // -------------------------------------------
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38 //####ECOSGPLCOPYRIGHTEND####
103
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39 //####UCDSNMPCOPYRIGHTBEGIN####
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40 //
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41 // -------------------------------------------
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42 //
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43 // Portions of this software may have been derived from the UCD-SNMP
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44 // project, <http://ucd-snmp.ucdavis.edu/> from the University of
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45 // California at Davis, which was originally based on the Carnegie Mellon
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46 // University SNMP implementation. Portions of this software are therefore
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47 // covered by the appropriate copyright disclaimers included herein.
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48 //
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49 // The release used was version 4.1.2 of May 2000. "ucd-snmp-4.1.2"
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50 // -------------------------------------------
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51 //
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52 //####UCDSNMPCOPYRIGHTEND####
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53 //==========================================================================
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54 //#####DESCRIPTIONBEGIN####
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55 //
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56 // Author(s): hmt
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57 // Contributors: hmt
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58 // Date: 2000-05-30
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59 // Purpose: Port of UCD-SNMP distribution to eCos.
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60 // Description:
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61 //
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62 //
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63 //####DESCRIPTIONEND####
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64 //
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65 //==========================================================================
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66 /********************************************************************
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67 Copyright 1989, 1991, 1992 by Carnegie Mellon University
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68
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69 Derivative Work -
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70 Copyright 1996, 1998, 1999, 2000 The Regents of the University of California
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71
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72 All Rights Reserved
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73
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74 Permission to use, copy, modify and distribute this software and its
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75 documentation for any purpose and without fee is hereby granted,
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76 provided that the above copyright notice appears in all copies and
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77 that both that copyright notice and this permission notice appear in
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78 supporting documentation, and that the name of CMU and The Regents of
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79 the University of California not be used in advertising or publicity
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80 pertaining to distribution of the software without specific written
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81 permission.
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82
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83 CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
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84 WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
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85 WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CMU OR
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86 THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
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87 INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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88 FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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89 CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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90 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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91 *********************************************************************/
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92
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93 /*
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94 * 13 Jun 91 wsak (wk0x@andrew) added mips support
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95 */
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96
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97 #include <config.h>
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98
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99 #ifdef CAN_USE_NLIST
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100
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101 #include <sys/types.h>
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102 #if HAVE_UNISTD_H
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103 #include <unistd.h>
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104 #endif
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105 #include <stdio.h>
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106 #include <errno.h>
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107 #if HAVE_STRING_H
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108 #include <string.h>
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109 #endif
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110 #if HAVE_FCNTL_H
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111 #include <fcntl.h>
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112 #endif
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113 #if HAVE_NETINET_IN_H
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114 #include <netinet/in.h>
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115 #endif
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116 #if HAVE_KVM_H
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117 #include <kvm.h>
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118 #endif
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119
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120 #include "asn1.h"
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121 #include "snmp_api.h"
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122 #include "snmp_impl.h"
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123 #include "snmp_logging.h"
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124 #include "default_store.h"
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125
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126 #include "kernel.h"
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127 #include "ds_agent.h"
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128
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129 #ifndef NULL
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130 #define NULL 0
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131 #endif
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132
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133
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134 #if HAVE_KVM_H
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135 kvm_t *kd;
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136
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137 void
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138 init_kmem(const char *file)
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139 {
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140 #if HAVE_KVM_OPENFILES
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141 char err[4096];
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142 kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, err);
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143 if (kd == NULL && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)) {
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144 snmp_log(LOG_CRIT, "init_kmem: kvm_openfiles failed: %s\n", err);
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145 exit(1);
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146 }
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147 #else
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148 kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
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149 if (!kd && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)) {
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150 snmp_log(LOG_CRIT, "init_kmem: kvm_open failed: %s\n", strerror(errno));
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151 exit(1);
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152 }
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153 #endif /* HAVE_KVM_OPENFILES */
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154 }
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155
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156
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157 /*
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158 * klookup:
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159 *
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160 * It seeks to the location off in kmem
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161 * It does a read into target of siz bytes.
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162 *
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163 * Return 0 on failure and 1 on sucess.
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164 *
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165 */
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166
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167
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168 int
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169 klookup(unsigned long off,
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170 char *target,
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171 int siz)
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172 {
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173 int result;
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174 if (kd == NULL) return 0;
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175 result = kvm_read(kd, off, target, siz);
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176 if (result != siz) {
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177 #if HAVE_KVM_OPENFILES
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178 snmp_log(LOG_ERR,"kvm_read(*, %lx, %p, %d) = %d: %s\n", off, target, siz,
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179 result, kvm_geterr(kd));
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180 #else
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181 snmp_log(LOG_ERR,"kvm_read(*, %lx, %p, %d) = %d: ", off, target, siz,
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182 result);
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183 snmp_log_perror("klookup");
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184 #endif
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185 return 0;
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186 }
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187 return 1;
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188 }
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189
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190 #else /* HAVE_KVM_H */
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191
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192 static off_t klseek (off_t);
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193 static int klread (char *, int);
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194 int swap, mem, kmem;
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195
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196 void
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197 init_kmem(const char *file)
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198 {
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199 kmem = open(file, O_RDONLY);
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200 if (kmem < 0 && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)){
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201 snmp_log_perror(file);
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202 exit(1);
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203 }
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204 fcntl(kmem,F_SETFD,1);
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205 mem = open("/dev/mem",O_RDONLY);
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206 if (mem < 0 && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)){
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207 snmp_log_perror("/dev/mem");
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208 exit(1);
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209 }
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210 fcntl(mem,F_SETFD,1);
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211 #ifdef DMEM_LOC
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212 swap = open(DMEM_LOC,O_RDONLY);
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213 if (swap < 0 && !ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS)){
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214 snmp_log_perror(DMEM_LOC);
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215 exit(1);
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216 }
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217 fcntl(swap,F_SETFD,1);
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218 #endif
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219 }
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220
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221
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222 /*
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223 * Seek into the kernel for a value.
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224 */
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225 static off_t
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226 klseek(off_t base)
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227 {
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228 return (lseek(kmem, (off_t)base, SEEK_SET));
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229 }
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230
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231
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232 /*
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233 * Read from the kernel
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234 */
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235 static int
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236 klread(char *buf,
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237 int buflen)
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238 {
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239 return (read(kmem, buf, buflen));
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240 }
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241
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242
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243 /*
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244 * klookup:
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245 *
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246 * It seeks to the location off in kmem
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247 * It does a read into target of siz bytes.
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248 *
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249 * Return 0 on failure and 1 on sucess.
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250 *
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251 */
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252
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253
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254 int
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255 klookup(unsigned long off,
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256 char *target,
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257 int siz)
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258 {
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259 long retsiz;
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260
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261 if (kmem < 0) return 0;
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262
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263 if ((retsiz = klseek((off_t) off)) != off) {
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264 snmp_log(LOG_ERR, "klookup(%lx, %p, %d): ", off, target, siz);
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265 snmp_log_perror("klseek");
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266 #ifdef EXIT_ON_BAD_KLREAD
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267 exit(1);
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268 #endif
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269 return (0);
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270 }
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271 if ((retsiz = klread(target, siz)) != siz ) {
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272 if (snmp_get_do_debugging()) {
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273 /* these happen too often on too many architectures to print them
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274 unless we're in debugging mode. People get very full log files. */
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275 snmp_log(LOG_ERR, "klookup(%lx, %p, %d): ", off, target, siz);
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276 snmp_log_perror("klread");
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277 }
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278 #ifdef EXIT_ON_BAD_KLREAD
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279 exit(1);
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280 #endif
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281 return(0);
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282 }
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283 return (1);
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284 }
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285
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286 #endif /* HAVE_KVM_H */
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287
95f3e12a6327 Merge from eCos master repository on 2000-06-23-16:41:10-BST
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288 #endif /* CAN_USE_NLIST */