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