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51ea0904 CT |
1 | /* |
2 | * $Id$ | |
3 | * | |
4 | * DEBUG: section 49 SNMP Interface | |
5 | * | |
6 | */ | |
7 | ||
8 | #include "config.h" | |
9 | #include "base/TextException.h" | |
10 | #include "CommCalls.h" | |
11 | #include "ipc/Port.h" | |
12 | #include "snmp_core.h" | |
13 | #include "snmpx/Forwarder.h" | |
14 | #include "snmpx/Request.h" | |
15 | #include "snmpx/Response.h" | |
16 | ||
17 | ||
18 | CBDATA_NAMESPACED_CLASS_INIT(Snmp, Forwarder); | |
19 | ||
20 | ||
21 | Snmp::Forwarder::Forwarder(const Pdu& aPdu, const Session& aSession, int aFd, | |
22 | const Ip::Address& anAddress): | |
23 | Ipc::Forwarder(new Request(KidIdentifier, 0, aPdu, aSession, aFd, anAddress), 2), | |
24 | fd(aFd) | |
25 | { | |
26 | debugs(49, 5, HERE << "FD " << aFd); | |
27 | Must(fd >= 0); | |
933a6aed | 28 | closer = asyncCall(49, 5, "Snmp::Forwarder::noteCommClosed", |
51ea0904 CT |
29 | CommCbMemFunT<Forwarder, CommCloseCbParams>(this, &Forwarder::noteCommClosed)); |
30 | comm_add_close_handler(fd, closer); | |
31 | } | |
32 | ||
33 | /// removes our cleanup handler of the client connection socket | |
34 | void | |
35 | Snmp::Forwarder::cleanup() | |
36 | { | |
37 | if (fd >= 0) { | |
38 | if (closer != NULL) { | |
39 | comm_remove_close_handler(fd, closer); | |
40 | closer = NULL; | |
41 | } | |
42 | fd = -1; | |
43 | } | |
44 | } | |
45 | ||
46 | /// called when the client socket gets closed by some external force | |
47 | void | |
48 | Snmp::Forwarder::noteCommClosed(const CommCloseCbParams& params) | |
49 | { | |
50 | debugs(49, 5, HERE); | |
51 | Must(fd == params.fd); | |
52 | fd = -1; | |
53 | mustStop("commClosed"); | |
54 | } | |
55 | ||
56 | void | |
57 | Snmp::Forwarder::handleTimeout() | |
58 | { | |
59 | sendError(SNMP_ERR_RESOURCEUNAVAILABLE); | |
60 | Ipc::Forwarder::handleTimeout(); | |
61 | } | |
62 | ||
63 | void | |
64 | Snmp::Forwarder::handleException(const std::exception& e) | |
65 | { | |
66 | debugs(49, 3, HERE << e.what()); | |
67 | if (fd >= 0) | |
68 | sendError(SNMP_ERR_GENERR); | |
69 | Ipc::Forwarder::handleException(e); | |
70 | } | |
71 | ||
72 | /// send error SNMP response | |
73 | void | |
74 | Snmp::Forwarder::sendError(int error) | |
75 | { | |
76 | debugs(49, 3, HERE); | |
77 | Snmp::Request& req = static_cast<Snmp::Request&>(*request); | |
78 | req.pdu.command = SNMP_PDU_RESPONSE; | |
79 | req.pdu.errstat = error; | |
80 | u_char buffer[SNMP_REQUEST_SIZE]; | |
81 | int len = sizeof(buffer); | |
82 | snmp_build(&req.session, &req.pdu, buffer, &len); | |
83 | comm_udp_sendto(fd, req.address, buffer, len); | |
84 | } | |
85 | ||
86 | void | |
87 | Snmp::SendResponse(unsigned int requestId, const Pdu& pdu) | |
88 | { | |
89 | debugs(49, 5, HERE); | |
90 | // snmpAgentResponse() can modify arg | |
91 | Pdu tmp = pdu; | |
92 | Snmp::Response response(requestId); | |
93 | snmp_pdu* response_pdu = NULL; | |
94 | try { | |
95 | response_pdu = snmpAgentResponse(&tmp); | |
96 | Must(response_pdu != NULL); | |
97 | response.pdu = static_cast<Pdu&>(*response_pdu); | |
98 | snmp_free_pdu(response_pdu); | |
99 | } catch (const std::exception& e) { | |
100 | debugs(49, DBG_CRITICAL, HERE << e.what()); | |
101 | response.pdu.command = SNMP_PDU_RESPONSE; | |
102 | response.pdu.errstat = SNMP_ERR_GENERR; | |
103 | } | |
104 | Ipc::TypedMsgHdr message; | |
105 | response.pack(message); | |
106 | Ipc::SendMessage(Ipc::coordinatorAddr, message); | |
107 | } |