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1 | /* | |
2 | * Copyright (C) 1996-2021 The Squid Software Foundation and contributors | |
3 | * | |
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. | |
7 | */ | |
8 | ||
9 | /* DEBUG: section 49 SNMP Interface */ | |
10 | ||
11 | #include "squid.h" | |
12 | #include "base/TextException.h" | |
13 | #include "ipc/TypedMsgHdr.h" | |
14 | #include "snmp/Pdu.h" | |
15 | #include "snmp/Var.h" | |
16 | #include "snmp_core.h" | |
17 | #include "tools.h" | |
18 | ||
19 | #include <algorithm> | |
20 | ||
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 | { | |
48 | memset(static_cast<snmp_pdu *>(this), 0, sizeof(snmp_pdu)); | |
49 | aggrCount = 0; | |
50 | errstat = SNMP_DEFAULT_ERRSTAT; | |
51 | errindex = SNMP_DEFAULT_ERRINDEX; | |
52 | } | |
53 | ||
54 | void | |
55 | Snmp::Pdu::aggregate(const Pdu& pdu) | |
56 | { | |
57 | Must(varCount() == pdu.varCount()); | |
58 | ++aggrCount; | |
59 | for (variable_list* p_aggr = variables, *p_var = pdu.variables; p_var != NULL; | |
60 | p_aggr = p_aggr->next_variable, p_var = p_var->next_variable) { | |
61 | Must(p_aggr != NULL); | |
62 | Var& aggr = static_cast<Var&>(*p_aggr); | |
63 | Var& var = static_cast<Var&>(*p_var); | |
64 | if (aggr.isNull()) { | |
65 | aggr.setName(var.getName()); | |
66 | aggr.copyValue(var); | |
67 | } else { | |
68 | switch (snmpAggrType(aggr.name, aggr.name_length)) { | |
69 | case atSum: | |
70 | case atAverage: | |
71 | // The mean-average division is done later | |
72 | // when the Snmp::Pdu::fixAggregate() called | |
73 | aggr += var; | |
74 | break; | |
75 | case atMax: | |
76 | if (var > aggr) | |
77 | aggr.copyValue(var); | |
78 | break; | |
79 | case atMin: | |
80 | if (var < aggr) | |
81 | aggr.copyValue(var); | |
82 | break; | |
83 | default: | |
84 | break; | |
85 | } | |
86 | } | |
87 | } | |
88 | } | |
89 | ||
90 | void | |
91 | Snmp::Pdu::clear() | |
92 | { | |
93 | clearSystemOid(); | |
94 | clearVars(); | |
95 | init(); | |
96 | } | |
97 | ||
98 | void | |
99 | Snmp::Pdu::assign(const Pdu& pdu) | |
100 | { | |
101 | command = pdu.command; | |
102 | address.sin_addr.s_addr = pdu.address.sin_addr.s_addr; | |
103 | reqid = pdu.reqid; | |
104 | errstat = pdu.errstat; | |
105 | errindex = pdu.errindex; | |
106 | non_repeaters = pdu.non_repeaters; | |
107 | max_repetitions = pdu.max_repetitions; | |
108 | agent_addr.sin_addr.s_addr = pdu.agent_addr.sin_addr.s_addr; | |
109 | trap_type = pdu.trap_type; | |
110 | specific_type = pdu.specific_type; | |
111 | time = pdu.time; | |
112 | aggrCount = pdu.aggrCount; | |
113 | setSystemOid(pdu.getSystemOid()); | |
114 | setVars(pdu.variables); | |
115 | } | |
116 | ||
117 | void | |
118 | Snmp::Pdu::clearVars() | |
119 | { | |
120 | variable_list* var = variables; | |
121 | while (var != NULL) { | |
122 | variable_list* tmp = var; | |
123 | var = var->next_variable; | |
124 | snmp_var_free(tmp); | |
125 | } | |
126 | variables = NULL; | |
127 | } | |
128 | ||
129 | void | |
130 | Snmp::Pdu::setVars(variable_list* vars) | |
131 | { | |
132 | clearVars(); | |
133 | for (variable_list** p_var = &variables; vars != NULL; | |
134 | vars = vars->next_variable, p_var = &(*p_var)->next_variable) { | |
135 | *p_var = new Var(static_cast<Var&>(*vars)); | |
136 | } | |
137 | } | |
138 | ||
139 | void | |
140 | Snmp::Pdu::clearSystemOid() | |
141 | { | |
142 | if (enterprise != NULL) { | |
143 | xfree(enterprise); | |
144 | enterprise = NULL; | |
145 | } | |
146 | enterprise_length = 0; | |
147 | } | |
148 | ||
149 | Range<const oid*> | |
150 | Snmp::Pdu::getSystemOid() const | |
151 | { | |
152 | return Range<const oid*>(enterprise, enterprise + enterprise_length); | |
153 | } | |
154 | ||
155 | void | |
156 | Snmp::Pdu::setSystemOid(const Range<const oid*>& systemOid) | |
157 | { | |
158 | clearSystemOid(); | |
159 | if (systemOid.start != NULL && systemOid.size() != 0) { | |
160 | enterprise_length = systemOid.size(); | |
161 | enterprise = static_cast<oid*>(xmalloc(enterprise_length * sizeof(oid))); | |
162 | std::copy(systemOid.start, systemOid.end, enterprise); | |
163 | } | |
164 | } | |
165 | ||
166 | void | |
167 | Snmp::Pdu::pack(Ipc::TypedMsgHdr& msg) const | |
168 | { | |
169 | msg.putPod(command); | |
170 | msg.putPod(address); | |
171 | msg.putPod(reqid); | |
172 | msg.putPod(errstat); | |
173 | msg.putPod(errindex); | |
174 | msg.putPod(non_repeaters); | |
175 | msg.putPod(max_repetitions); | |
176 | msg.putInt(enterprise_length); | |
177 | if (enterprise_length > 0) { | |
178 | Must(enterprise != NULL); | |
179 | msg.putFixed(enterprise, enterprise_length * sizeof(oid)); | |
180 | } | |
181 | msg.putPod(agent_addr); | |
182 | msg.putPod(trap_type); | |
183 | msg.putPod(specific_type); | |
184 | msg.putPod(time); | |
185 | msg.putInt(varCount()); | |
186 | for (variable_list* var = variables; var != NULL; var = var->next_variable) | |
187 | static_cast<Var*>(var)->pack(msg); | |
188 | } | |
189 | ||
190 | void | |
191 | Snmp::Pdu::unpack(const Ipc::TypedMsgHdr& msg) | |
192 | { | |
193 | clear(); | |
194 | msg.getPod(command); | |
195 | msg.getPod(address); | |
196 | msg.getPod(reqid); | |
197 | msg.getPod(errstat); | |
198 | msg.getPod(errindex); | |
199 | msg.getPod(non_repeaters); | |
200 | msg.getPod(max_repetitions); | |
201 | enterprise_length = msg.getInt(); | |
202 | if (enterprise_length > 0) { | |
203 | enterprise = static_cast<oid*>(xmalloc(enterprise_length * sizeof(oid))); | |
204 | msg.getFixed(enterprise, enterprise_length * sizeof(oid)); | |
205 | } | |
206 | msg.getPod(agent_addr); | |
207 | msg.getPod(trap_type); | |
208 | msg.getPod(specific_type); | |
209 | msg.getPod(time); | |
210 | int count = msg.getInt(); | |
211 | for (variable_list** p_var = &variables; count > 0; | |
212 | p_var = &(*p_var)->next_variable, --count) { | |
213 | Var* var = new Var(); | |
214 | var->unpack(msg); | |
215 | *p_var = var; | |
216 | } | |
217 | } | |
218 | ||
219 | int | |
220 | Snmp::Pdu::varCount() const | |
221 | { | |
222 | int count = 0; | |
223 | for (variable_list* var = variables; var != NULL; var = var->next_variable) | |
224 | ++count; | |
225 | return count; | |
226 | } | |
227 | ||
228 | void | |
229 | Snmp::Pdu::fixAggregate() | |
230 | { | |
231 | if (aggrCount < 2) | |
232 | return; | |
233 | for (variable_list* p_aggr = variables; p_aggr != NULL; p_aggr = p_aggr->next_variable) { | |
234 | Var& aggr = static_cast<Var&>(*p_aggr); | |
235 | if (snmpAggrType(aggr.name, aggr.name_length) == atAverage) { | |
236 | aggr /= aggrCount; | |
237 | } | |
238 | } | |
239 | aggrCount = 0; | |
240 | } | |
241 |