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51ea0904 | 1 | /* |
5b74111a | 2 | * Copyright (C) 1996-2018 The Squid Software Foundation and contributors |
51ea0904 | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
51ea0904 CT |
7 | */ |
8 | ||
bbc27441 AJ |
9 | /* DEBUG: section 49 SNMP Interface */ |
10 | ||
f7f3304a | 11 | #include "squid.h" |
51ea0904 CT |
12 | #include "base/TextException.h" |
13 | #include "ipc/TypedMsgHdr.h" | |
d6e3ad20 CT |
14 | #include "snmp/Pdu.h" |
15 | #include "snmp/Var.h" | |
602d9612 | 16 | #include "snmp_core.h" |
5bed43d6 | 17 | #include "tools.h" |
074d6a40 | 18 | |
b167f1b8 | 19 | #include <algorithm> |
51ea0904 | 20 | |
51ea0904 CT |
21 | Snmp::Pdu::Pdu() |
22 | { | |
23 | init(); | |
24 | } | |
25 | ||
26 | Snmp::Pdu::Pdu(const Pdu& pdu) | |
27 | { | |
28 | init(); | |
29 | assign(pdu); | |
30 | } | |
31 | ||
32 | Snmp::Pdu::~Pdu() | |
33 | { | |
34 | clear(); | |
35 | } | |
36 | ||
37 | Snmp::Pdu& | |
38 | Snmp::Pdu::operator = (const Pdu& pdu) | |
39 | { | |
40 | clear(); | |
41 | assign(pdu); | |
42 | return *this; | |
43 | } | |
44 | ||
45 | void | |
46 | Snmp::Pdu::init() | |
47 | { | |
e297be13 | 48 | memset(this, 0, sizeof(*this)); |
51ea0904 CT |
49 | errstat = SNMP_DEFAULT_ERRSTAT; |
50 | errindex = SNMP_DEFAULT_ERRINDEX; | |
51 | } | |
52 | ||
53 | void | |
54 | Snmp::Pdu::aggregate(const Pdu& pdu) | |
55 | { | |
56 | Must(varCount() == pdu.varCount()); | |
d7ae3534 | 57 | ++aggrCount; |
51ea0904 | 58 | for (variable_list* p_aggr = variables, *p_var = pdu.variables; p_var != NULL; |
8fb5a96c | 59 | p_aggr = p_aggr->next_variable, p_var = p_var->next_variable) { |
51ea0904 CT |
60 | Must(p_aggr != NULL); |
61 | Var& aggr = static_cast<Var&>(*p_aggr); | |
62 | Var& var = static_cast<Var&>(*p_var); | |
63 | if (aggr.isNull()) { | |
64 | aggr.setName(var.getName()); | |
65 | aggr.copyValue(var); | |
66 | } else { | |
8fb5a96c | 67 | switch (snmpAggrType(aggr.name, aggr.name_length)) { |
51ea0904 CT |
68 | case atSum: |
69 | case atAverage: | |
f738d783 CT |
70 | // The mean-average division is done later |
71 | // when the Snmp::Pdu::fixAggregate() called | |
51ea0904 CT |
72 | aggr += var; |
73 | break; | |
74 | case atMax: | |
75 | if (var > aggr) | |
76 | aggr.copyValue(var); | |
77 | break; | |
78 | case atMin: | |
79 | if (var < aggr) | |
80 | aggr.copyValue(var); | |
81 | break; | |
82 | default: | |
83 | break; | |
84 | } | |
85 | } | |
86 | } | |
87 | } | |
88 | ||
89 | void | |
90 | Snmp::Pdu::clear() | |
91 | { | |
92 | clearSystemOid(); | |
93 | clearVars(); | |
94 | init(); | |
95 | } | |
96 | ||
97 | void | |
98 | Snmp::Pdu::assign(const Pdu& pdu) | |
99 | { | |
100 | command = pdu.command; | |
101 | address.sin_addr.s_addr = pdu.address.sin_addr.s_addr; | |
102 | reqid = pdu.reqid; | |
103 | errstat = pdu.errstat; | |
104 | errindex = pdu.errindex; | |
105 | non_repeaters = pdu.non_repeaters; | |
106 | max_repetitions = pdu.max_repetitions; | |
107 | agent_addr.sin_addr.s_addr = pdu.agent_addr.sin_addr.s_addr; | |
108 | trap_type = pdu.trap_type; | |
109 | specific_type = pdu.specific_type; | |
110 | time = pdu.time; | |
e26257b2 | 111 | aggrCount = pdu.aggrCount; |
51ea0904 CT |
112 | setSystemOid(pdu.getSystemOid()); |
113 | setVars(pdu.variables); | |
114 | } | |
115 | ||
116 | void | |
117 | Snmp::Pdu::clearVars() | |
118 | { | |
119 | variable_list* var = variables; | |
120 | while (var != NULL) { | |
121 | variable_list* tmp = var; | |
122 | var = var->next_variable; | |
123 | snmp_var_free(tmp); | |
124 | } | |
125 | variables = NULL; | |
126 | } | |
127 | ||
128 | void | |
129 | Snmp::Pdu::setVars(variable_list* vars) | |
130 | { | |
131 | clearVars(); | |
132 | for (variable_list** p_var = &variables; vars != NULL; | |
8fb5a96c | 133 | vars = vars->next_variable, p_var = &(*p_var)->next_variable) { |
51ea0904 CT |
134 | *p_var = new Var(static_cast<Var&>(*vars)); |
135 | } | |
136 | } | |
137 | ||
138 | void | |
139 | Snmp::Pdu::clearSystemOid() | |
140 | { | |
141 | if (enterprise != NULL) { | |
142 | xfree(enterprise); | |
143 | enterprise = NULL; | |
144 | } | |
145 | enterprise_length = 0; | |
146 | } | |
147 | ||
148 | Range<const oid*> | |
149 | Snmp::Pdu::getSystemOid() const | |
150 | { | |
151 | return Range<const oid*>(enterprise, enterprise + enterprise_length); | |
152 | } | |
153 | ||
154 | void | |
155 | Snmp::Pdu::setSystemOid(const Range<const oid*>& systemOid) | |
156 | { | |
157 | clearSystemOid(); | |
158 | if (systemOid.start != NULL && systemOid.size() != 0) { | |
159 | enterprise_length = systemOid.size(); | |
160 | enterprise = static_cast<oid*>(xmalloc(enterprise_length * sizeof(oid))); | |
161 | std::copy(systemOid.start, systemOid.end, enterprise); | |
162 | } | |
163 | } | |
164 | ||
165 | void | |
166 | Snmp::Pdu::pack(Ipc::TypedMsgHdr& msg) const | |
167 | { | |
168 | msg.putPod(command); | |
169 | msg.putPod(address); | |
170 | msg.putPod(reqid); | |
171 | msg.putPod(errstat); | |
172 | msg.putPod(errindex); | |
173 | msg.putPod(non_repeaters); | |
174 | msg.putPod(max_repetitions); | |
175 | msg.putInt(enterprise_length); | |
176 | if (enterprise_length > 0) { | |
177 | Must(enterprise != NULL); | |
178 | msg.putFixed(enterprise, enterprise_length * sizeof(oid)); | |
179 | } | |
180 | msg.putPod(agent_addr); | |
181 | msg.putPod(trap_type); | |
182 | msg.putPod(specific_type); | |
183 | msg.putPod(time); | |
184 | msg.putInt(varCount()); | |
185 | for (variable_list* var = variables; var != NULL; var = var->next_variable) | |
186 | static_cast<Var*>(var)->pack(msg); | |
187 | } | |
188 | ||
189 | void | |
190 | Snmp::Pdu::unpack(const Ipc::TypedMsgHdr& msg) | |
191 | { | |
192 | clear(); | |
193 | msg.getPod(command); | |
194 | msg.getPod(address); | |
195 | msg.getPod(reqid); | |
196 | msg.getPod(errstat); | |
197 | msg.getPod(errindex); | |
198 | msg.getPod(non_repeaters); | |
199 | msg.getPod(max_repetitions); | |
200 | enterprise_length = msg.getInt(); | |
201 | if (enterprise_length > 0) { | |
202 | enterprise = static_cast<oid*>(xmalloc(enterprise_length * sizeof(oid))); | |
203 | msg.getFixed(enterprise, enterprise_length * sizeof(oid)); | |
204 | } | |
205 | msg.getPod(agent_addr); | |
206 | msg.getPod(trap_type); | |
207 | msg.getPod(specific_type); | |
208 | msg.getPod(time); | |
209 | int count = msg.getInt(); | |
210 | for (variable_list** p_var = &variables; count > 0; | |
8fb5a96c | 211 | p_var = &(*p_var)->next_variable, --count) { |
51ea0904 CT |
212 | Var* var = new Var(); |
213 | var->unpack(msg); | |
214 | *p_var = var; | |
215 | } | |
216 | } | |
217 | ||
218 | int | |
219 | Snmp::Pdu::varCount() const | |
220 | { | |
221 | int count = 0; | |
222 | for (variable_list* var = variables; var != NULL; var = var->next_variable) | |
223 | ++count; | |
224 | return count; | |
225 | } | |
e26257b2 | 226 | |
8fb5a96c | 227 | void |
e26257b2 CT |
228 | Snmp::Pdu::fixAggregate() |
229 | { | |
f738d783 | 230 | if (aggrCount < 2) |
e26257b2 CT |
231 | return; |
232 | for (variable_list* p_aggr = variables; p_aggr != NULL; p_aggr = p_aggr->next_variable) { | |
233 | Var& aggr = static_cast<Var&>(*p_aggr); | |
8fb5a96c | 234 | if (snmpAggrType(aggr.name, aggr.name_length) == atAverage) { |
e26257b2 CT |
235 | aggr /= aggrCount; |
236 | } | |
237 | } | |
238 | aggrCount = 0; | |
239 | } | |
f53969cc | 240 |