196 lines
5.0 KiB
C
196 lines
5.0 KiB
C
/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <snmp_mtp.h>
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#include <cellmgr_debug.h>
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#include <osmocom/core/talloc.h>
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static void add_pdu_var(netsnmp_pdu *pdu, const char *mib_name, int id, const char *value)
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{
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oid oid_name[MAX_OID_LEN];
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size_t name_length;
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char buf[4096];
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buf[4095] = '\0';
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snprintf(buf, sizeof(buf)-1, "%s.%d", mib_name, id);
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name_length = MAX_OID_LEN;
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if (snmp_parse_oid(buf, oid_name, &name_length) == NULL) {
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snmp_perror(buf);
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return;
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}
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if (snmp_add_var(pdu, oid_name, name_length, '=', value)) {
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snmp_perror(buf);
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return;
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}
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}
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static int link_up_cb(int op, netsnmp_session *ss,
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int reqid, netsnmp_pdu *pdu, void *data)
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{
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struct snmp_mtp_session *mtp = ss->myvoid;
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int link_index = (int) data;
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if (mtp->last_up_req != reqid)
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return 0;
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mtp->last_up_req = 0;
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snmp_mtp_callback(mtp, SNMP_LINK_UP,
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op == STAT_TIMEOUT ? SNMP_STATUS_TIMEOUT : SNMP_STATUS_OK,
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link_index);
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return 0;
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}
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static int link_down_cb(int op, netsnmp_session *ss,
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int reqid, netsnmp_pdu *pdu, void *data)
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{
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struct snmp_mtp_session *mtp = ss->myvoid;
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int link_index = (int) data;
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if (mtp->last_do_req != reqid)
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return 0;
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mtp->last_do_req = 0;
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snmp_mtp_callback(mtp, SNMP_LINK_DOWN,
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op == STAT_TIMEOUT ? SNMP_STATUS_TIMEOUT : SNMP_STATUS_OK,
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link_index);
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return 0;
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}
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static int send_pdu(netsnmp_session *ss, netsnmp_pdu *pdu, int kind, int link_id)
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{
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int status;
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netsnmp_callback cb;
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cb = kind == SNMP_LINK_UP ? link_up_cb : link_down_cb;
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status = snmp_async_send(ss, pdu, cb, (void *) link_id);
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if (status == 0) {
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snmp_log(LOG_ERR, "Failed to send async request.\n");
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snmp_free_pdu(pdu);
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}
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return status;
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}
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static void snmp_mtp_start_c7_datalink(struct snmp_mtp_session *session, int link_id)
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{
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int status;
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netsnmp_pdu *pdu;
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pdu = snmp_pdu_create(SNMP_MSG_SET);
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add_pdu_var(pdu, "PTI-NexusWareC7-MIB::nwc7DatalinkCommand", link_id, "nwc7DatalinkCmdPowerOn");
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add_pdu_var(pdu, "PTI-NexusWareC7-MIB::nwc7Mtp2Active", link_id, "true");
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status = send_pdu(session->ss, pdu, SNMP_LINK_UP, link_id);
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if (status == 0)
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snmp_mtp_callback(session, SNMP_LINK_UP, SNMP_STATUS_TIMEOUT, link_id);
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else
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session->last_up_req = status;
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}
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static void snmp_mtp_stop_c7_datalink(struct snmp_mtp_session *session, int link_id)
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{
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int status;
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netsnmp_pdu *pdu;
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pdu = snmp_pdu_create(SNMP_MSG_SET);
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add_pdu_var(pdu, "PTI-NexusWareC7-MIB::nwc7Mtp2Active", link_id, "false");
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status = send_pdu(session->ss, pdu, SNMP_LINK_DOWN, link_id);
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if (status == 0)
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snmp_mtp_callback(session, SNMP_LINK_DOWN, SNMP_STATUS_TIMEOUT, link_id);
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else
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session->last_do_req = status;
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}
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struct snmp_mtp_session *snmp_mtp_session_create()
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{
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struct snmp_mtp_session *session = talloc_zero(NULL, struct snmp_mtp_session);
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if (!session)
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return NULL;
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init_snmp("cellmgr_ng");
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snmp_sess_init(&session->session);
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session->session.version = SNMP_VERSION_1;
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session->session.community = (unsigned char *) "private";
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session->session.community_len = strlen((const char *) session->session.community);
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session->session.myvoid = session;
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return session;
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}
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int snmp_mtp_peer_name(struct snmp_mtp_session *session, char *host)
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{
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if (session->ss) {
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snmp_close(session->ss);
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session->ss = NULL;
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}
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session->session.peername = host;
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session->ss = snmp_open(&session->session);
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if (!session->ss) {
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snmp_perror("create failure");
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snmp_log(LOG_ERR, "Could not connect to the remote.\n");
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LOGP(DINP, LOGL_ERROR, "Failed to open a SNMP session.\n");
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return -1;
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}
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return 0;
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}
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void snmp_mtp_deactivate(struct snmp_mtp_session *session, int index)
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{
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snmp_mtp_stop_c7_datalink(session, index);
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}
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void snmp_mtp_activate(struct snmp_mtp_session *session, int index)
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{
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snmp_mtp_start_c7_datalink(session, index);
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}
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/**
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* This is the easiest way to integrate SNMP without
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* introducing threads. It would be nicer if it could
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* register a timeout and the fd it wants to have selected
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* for reading. We could try to find the fd's it is using
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* for the session but there is no difference in performance
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*/
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void snmp_mtp_poll()
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{
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int num_fds = 0, block = 0;
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fd_set fds;
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FD_ZERO(&fds);
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struct timeval tv;
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int rc;
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snmp_select_info(&num_fds, &fds, &tv, &block);
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memset(&tv, 0, sizeof(tv));
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rc = select(num_fds, &fds, NULL, NULL, &tv);
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if (rc == 0)
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snmp_timeout();
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else
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snmp_read(&fds);
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}
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