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51ea0904 | 1 | /* |
4ac4a490 | 2 | * Copyright (C) 1996-2017 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 | 12 | #include "base/TextException.h" |
1b76e6c1 | 13 | #include "comm.h" |
602d9612 | 14 | #include "CommCalls.h" |
582c2af2 | 15 | #include "globals.h" |
51ea0904 | 16 | #include "ipc/Port.h" |
d6e3ad20 CT |
17 | #include "snmp/Forwarder.h" |
18 | #include "snmp/Request.h" | |
19 | #include "snmp/Response.h" | |
602d9612 | 20 | #include "snmp_core.h" |
51ea0904 | 21 | |
51ea0904 CT |
22 | CBDATA_NAMESPACED_CLASS_INIT(Snmp, Forwarder); |
23 | ||
51ea0904 CT |
24 | Snmp::Forwarder::Forwarder(const Pdu& aPdu, const Session& aSession, int aFd, |
25 | const Ip::Address& anAddress): | |
f53969cc SM |
26 | Ipc::Forwarder(new Request(KidIdentifier, 0, aPdu, aSession, aFd, anAddress), 2), |
27 | fd(aFd) | |
51ea0904 CT |
28 | { |
29 | debugs(49, 5, HERE << "FD " << aFd); | |
30 | Must(fd >= 0); | |
933a6aed | 31 | closer = asyncCall(49, 5, "Snmp::Forwarder::noteCommClosed", |
51ea0904 CT |
32 | CommCbMemFunT<Forwarder, CommCloseCbParams>(this, &Forwarder::noteCommClosed)); |
33 | comm_add_close_handler(fd, closer); | |
34 | } | |
35 | ||
36 | /// removes our cleanup handler of the client connection socket | |
37 | void | |
38 | Snmp::Forwarder::cleanup() | |
39 | { | |
40 | if (fd >= 0) { | |
41 | if (closer != NULL) { | |
42 | comm_remove_close_handler(fd, closer); | |
43 | closer = NULL; | |
44 | } | |
45 | fd = -1; | |
46 | } | |
47 | } | |
48 | ||
49 | /// called when the client socket gets closed by some external force | |
50 | void | |
51 | Snmp::Forwarder::noteCommClosed(const CommCloseCbParams& params) | |
52 | { | |
53 | debugs(49, 5, HERE); | |
54 | Must(fd == params.fd); | |
55 | fd = -1; | |
56 | mustStop("commClosed"); | |
57 | } | |
58 | ||
59 | void | |
60 | Snmp::Forwarder::handleTimeout() | |
61 | { | |
62 | sendError(SNMP_ERR_RESOURCEUNAVAILABLE); | |
63 | Ipc::Forwarder::handleTimeout(); | |
64 | } | |
65 | ||
66 | void | |
67 | Snmp::Forwarder::handleException(const std::exception& e) | |
68 | { | |
69 | debugs(49, 3, HERE << e.what()); | |
70 | if (fd >= 0) | |
71 | sendError(SNMP_ERR_GENERR); | |
72 | Ipc::Forwarder::handleException(e); | |
73 | } | |
74 | ||
75 | /// send error SNMP response | |
76 | void | |
77 | Snmp::Forwarder::sendError(int error) | |
78 | { | |
79 | debugs(49, 3, HERE); | |
80 | Snmp::Request& req = static_cast<Snmp::Request&>(*request); | |
81 | req.pdu.command = SNMP_PDU_RESPONSE; | |
82 | req.pdu.errstat = error; | |
83 | u_char buffer[SNMP_REQUEST_SIZE]; | |
84 | int len = sizeof(buffer); | |
85 | snmp_build(&req.session, &req.pdu, buffer, &len); | |
86 | comm_udp_sendto(fd, req.address, buffer, len); | |
87 | } | |
88 | ||
89 | void | |
90 | Snmp::SendResponse(unsigned int requestId, const Pdu& pdu) | |
91 | { | |
92 | debugs(49, 5, HERE); | |
93 | // snmpAgentResponse() can modify arg | |
94 | Pdu tmp = pdu; | |
95 | Snmp::Response response(requestId); | |
96 | snmp_pdu* response_pdu = NULL; | |
97 | try { | |
98 | response_pdu = snmpAgentResponse(&tmp); | |
99 | Must(response_pdu != NULL); | |
100 | response.pdu = static_cast<Pdu&>(*response_pdu); | |
101 | snmp_free_pdu(response_pdu); | |
102 | } catch (const std::exception& e) { | |
103 | debugs(49, DBG_CRITICAL, HERE << e.what()); | |
104 | response.pdu.command = SNMP_PDU_RESPONSE; | |
105 | response.pdu.errstat = SNMP_ERR_GENERR; | |
106 | } | |
107 | Ipc::TypedMsgHdr message; | |
108 | response.pack(message); | |
1ee292b7 | 109 | Ipc::SendMessage(Ipc::Port::CoordinatorAddr(), message); |
51ea0904 | 110 | } |
f53969cc | 111 |