SNMP: Large refactorings and new dynamic table support
This commit is contained in:
Olof hagsand
parent
ebf251455f
commit
150ad3ab8b
4 changed files with 742 additions and 229 deletions
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@ -71,50 +71,120 @@ snmp_common_handler(netsnmp_mib_handler *handler,
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{
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int retval = -1;
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netsnmp_variable_list *requestvb; /* sub of requests */
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char oidstr0[MAX_OID_LEN*2] = {0,};
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char oidstr1[MAX_OID_LEN*2] = {0,};
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char oidstr2[MAX_OID_LEN*2] = {0,};
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cbuf *cb;
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if (requests == NULL || shp == NULL){
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clicon_err(OE_XML, EINVAL, "requests or shp is null");
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goto done;
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}
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requestvb = requests->requestvb;
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if (snprint_objid(oidstr0, sizeof(oidstr0),
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requestvb->name, requestvb->name_length) < 0){
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clicon_err(OE_XML, 0, "snprint_objid buffer too small");
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goto done;
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}
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if ((*shp = (clixon_snmp_handle*)handler->myvoid) == NULL){
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clicon_err(OE_XML, 0, "No myvoid handler");
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goto done;
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}
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if (snprint_objid(oidstr1, sizeof(oidstr1),
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nhreg->rootoid, nhreg->rootoid_len) < 0){
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clicon_err(OE_XML, 0, "snprint_objid buffer too small");
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if ((cb = cbuf_new()) == NULL){
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clicon_err(OE_UNIX, errno, "cbuf_new");
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goto done;
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}
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if (snprint_objid(oidstr2, sizeof(oidstr2),
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(*shp)->sh_oid, (*shp)->sh_oidlen) < 0){
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clicon_err(OE_XML, 0, "snprint_objid buffer too small");
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goto done;
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}
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if (strcmp(oidstr0, oidstr2) == 0)
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oid_cbuf(cb, (*shp)->sh_oid, (*shp)->sh_oidlen);
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if (oid_eq(requestvb->name, requestvb->name_length,
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(*shp)->sh_oid, (*shp)->sh_oidlen) == 0){ /* equal */
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clicon_debug(1, "%s \"%s\" %s inclusive:%d %s", __FUNCTION__,
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oidstr2,
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cbuf_get(cb),
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snmp_msg_int2str(reqinfo->mode),
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requests->inclusive, tablehandler?"table":"scalar");
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else
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clicon_debug(1, "%s \"%s\"/\"%s\" %s inclusive:%d %s", __FUNCTION__,
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oidstr2, oidstr0,
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}
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else{ /* not equal */
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cprintf(cb, " (");
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oid_cbuf(cb, requestvb->name, requestvb->name_length);
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cprintf(cb, ")");
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// nhreg->rootoid same as shp
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clicon_debug(1, "%s \"%s\" %s inclusive:%d %s", __FUNCTION__,
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cbuf_get(cb),
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snmp_msg_int2str(reqinfo->mode),
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requests->inclusive, tablehandler?"table":"scalar");
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}
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retval = 0;
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done:
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if (cb)
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cbuf_free(cb);
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return retval;
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}
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#ifdef SNMP_TABLE_DYNAMIC
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/*!
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*/
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static int
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snmp_scalar_return(cxobj *xs,
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yang_stmt *ys,
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oid *oidc,
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size_t oidclen,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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int retval = -1;
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int asn1type;
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char *xmlstr = NULL;
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char *defaultval = NULL;
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u_char *snmpval = NULL;
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size_t snmplen = 0;
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char *reason = NULL;
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netsnmp_variable_list *requestvb = requests->requestvb;
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int ret;
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/* SMI default value, How is this different from yang defaults?
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*/
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if (yang_extension_value(ys, "defval", IETF_YANG_SMIV2_NS, NULL, &defaultval) < 0)
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goto done;
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if (xs != NULL){
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if ((ret = type_xml2snmp_pre(xml_body(xs), ys, &xmlstr)) < 0)
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goto done;
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if (ret == 0){
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netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_WRONGVALUE);
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goto ok;
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}
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}
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else if (defaultval != NULL){
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if ((xmlstr = strdup(defaultval)) == NULL){
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clicon_err(OE_UNIX, errno, "strdup");
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goto done;
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}
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}
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else{
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netsnmp_set_request_error(reqinfo, requests, SNMP_NOSUCHINSTANCE);
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goto ok;
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}
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if (type_yang2asn1(ys, &asn1type, 1) < 0)
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goto done;
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if ((ret = type_xml2snmp(xmlstr, &asn1type, &snmpval, &snmplen, &reason)) < 0)
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goto done;
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if (ret == 0){
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clicon_debug(1, "%s %s", __FUNCTION__, reason);
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netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_WRONGTYPE);
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goto ok;
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}
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/* see snmplib/snmp_client. somewhat indirect
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*/
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if ((ret = snmp_set_var_typed_value(requestvb, asn1type, snmpval, snmplen)) != SNMPERR_SUCCESS){
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clicon_err(OE_SNMP, ret, "snmp_set_var_typed_value");
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goto done;
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}
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if ((ret = snmp_set_var_objid(requestvb, oidc, oidclen)) != SNMPERR_SUCCESS){
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clicon_err(OE_SNMP, ret, "snmp_set_var_objid");
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goto done;
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}
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ok:
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retval = 0;
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done:
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if (xmlstr)
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free(xmlstr);
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if (snmpval)
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free(snmpval);
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if (reason)
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free(reason);
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return retval;
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}
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#endif /* SNMP_TABLE_DYNAMIC */
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/*! Scalar handler, set a value to clixon
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* get xpath: see yang2api_path_fmt / api_path2xpath
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@ -125,12 +195,13 @@ snmp_common_handler(netsnmp_mib_handler *handler,
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* @param[in] defaultval
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* @param[in] reqinfo
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* @param[in] requests
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* @retval 0 OK
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* @retval -1 Error
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*/
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static int
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snmp_scalar_get(clicon_handle h,
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yang_stmt *ys,
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cvec *cvk,
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netsnmp_variable_list *requestvb,
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char *defaultval,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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@ -147,13 +218,14 @@ snmp_scalar_get(clicon_handle h,
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int ret;
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int asn1type;
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char *reason = NULL;
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netsnmp_variable_list *requestvb = requests->requestvb;
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clicon_debug(1, "%s", __FUNCTION__);
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/* Prepare backend call by constructing namespace context */
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if (xml_nsctx_yang(ys, &nsc) < 0)
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goto done;
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/* Create xpath from yang (XXX works not for lists) */
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if (yang2xpath(ys, cvk, &xpath) < 0)
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if (snmp_yang2xpath(ys, cvk, &xpath) < 0)
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goto done;
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/* Do the backend call */
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if (clicon_rpc_get(h, xpath, nsc, CONTENT_ALL, -1, &xt) < 0)
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@ -198,9 +270,8 @@ snmp_scalar_get(clicon_handle h,
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}
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/* see snmplib/snmp_client. somewhat indirect
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*/
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requestvb->type = asn1type; // ASN_NULL on input
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if ((ret = snmp_set_var_value(requestvb, snmpval, snmplen)) != SNMPERR_SUCCESS){
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clicon_err(OE_SNMP, ret, "snmp_set_var_value");
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if ((ret = snmp_set_var_typed_value(requestvb, asn1type, snmpval, snmplen)) != SNMPERR_SUCCESS){
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clicon_err(OE_SNMP, ret, "snmp_set_var_typed_value");
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goto done;
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}
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ok:
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@ -226,7 +297,6 @@ snmp_scalar_get(clicon_handle h,
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static int
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snmp_scalar_set(clicon_handle h,
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yang_stmt *ys,
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netsnmp_variable_list *requestvb,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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@ -239,7 +309,8 @@ snmp_scalar_set(clicon_handle h,
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int ret;
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char *valstr = NULL;
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cbuf *cb = NULL;
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netsnmp_variable_list *requestvb = requests->requestvb;
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if ((yspec = clicon_dbspec_yang(h)) == NULL){
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clicon_err(OE_FATAL, 0, "No DB_SPEC");
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goto done;
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@ -250,7 +321,6 @@ snmp_scalar_set(clicon_handle h,
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goto done;
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if ((ret = api_path2xml(api_path, yspec, xtop, YC_DATANODE, 1, &xbot, NULL, NULL)) < 0)
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goto done;
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if (ret == 0){
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clicon_err(OE_XML, 0, "api_path2xml %s invalid", api_path);
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goto done;
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@ -309,7 +379,7 @@ clixon_snmp_scalar_handler(netsnmp_mib_handler *handler,
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switch (reqinfo->mode) {
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case MODE_GET: /* 160 */
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if (snmp_scalar_get(sh->sh_h, sh->sh_ys, sh->sh_cvk_orig,
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requestvb, sh->sh_default, reqinfo, requests) < 0)
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sh->sh_default, reqinfo, requests) < 0)
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goto done;
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break;
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case MODE_GETNEXT: /* 161 */
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@ -328,7 +398,7 @@ clixon_snmp_scalar_handler(netsnmp_mib_handler *handler,
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case MODE_SET_RESERVE2: /* 1 */
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break;
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case MODE_SET_ACTION: /* 2 */
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if (snmp_scalar_set(sh->sh_h, sh->sh_ys, requestvb, reqinfo, requests) < 0)
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if (snmp_scalar_set(sh->sh_h, sh->sh_ys, reqinfo, requests) < 0)
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goto done;
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break;
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case MODE_SET_UNDO: /* 5 */
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@ -348,6 +418,227 @@ clixon_snmp_scalar_handler(netsnmp_mib_handler *handler,
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return retval;
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}
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#ifdef SNMP_TABLE_DYNAMIC
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/*! Create xpath from YANG table OID + 1 + n + cvk/key = requestvb->name
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* Get yang of leaf from first part of OID
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* Create xpath with right keys from later part of OID
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* Query clixon if object exists, if so return value
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* @param[in] h Clixon handle
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* @param[in] yt Yang of table (of list type)
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* @param[in] oids OID of ultimate scalar value
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* @param[in] oidslen OID length of scalar
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* @param[in] reginfo
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* @param[in] requests
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* @retval -1 Error
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* @retval 0 Object not found
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* @retval 1 OK
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*/
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static int
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snmp_table_get(clicon_handle h,
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yang_stmt *yt,
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oid *oids,
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size_t oidslen,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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int retval = -1;
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oid oidt[MAX_OID_LEN] = {0,}; /* Table / list oid */
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size_t oidtlen = MAX_OID_LEN;
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oid oidleaf[MAX_OID_LEN] = {0,}; /* Leaf */
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size_t oidleaflen = MAX_OID_LEN;
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oid *oidi;
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size_t oidilen;
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yang_stmt *ys;
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yang_stmt *yk;
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char *xpath = NULL;
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cvec *cvk_orig;
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cvec *cvk_val;
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int i;
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cg_var *cv;
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char *defaultval = NULL;
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int ret;
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/* Get OID from table /list */
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if ((ret = yangext_oid_get(yt, oidt, &oidtlen, NULL)) < 0)
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goto done;
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if (ret == 0)
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goto done;
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/* Get yang of leaf from first part of OID */
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ys = NULL;
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while ((ys = yn_each(yt, ys)) != NULL) {
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if (yang_keyword_get(ys) != Y_LEAF)
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continue;
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if ((ret = yangext_oid_get(ys, oidleaf, &oidleaflen, NULL)) < 0)
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goto done;
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if (ret == 0)
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goto done;
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assert(oidtlen + 1 == oidleaflen);
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if (oids[oidleaflen-1] == oidleaf[oidleaflen-1])
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break;
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}
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if (ys == NULL){
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/* No leaf with matching OID */
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goto fail;
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}
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/* SMI default value, How is this different from yang defaults?
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*/
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if (yang_extension_value(ys, "defval", IETF_YANG_SMIV2_NS, NULL, &defaultval) < 0)
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goto done;
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/* Create xpath with right keys from later part of OID
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* Inverse of snmp_str2oid
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*/
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if ((cvk_orig = yang_cvec_get(yt)) == NULL){
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clicon_err(OE_YANG, 0, "No keys");
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goto done;
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}
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if ((cvk_val = cvec_dup(cvk_orig)) == NULL){
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clicon_err(OE_UNIX, errno, "cvec_dup");
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goto done;
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}
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oidilen = oidslen-(oidtlen+1);
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oidi = oids+oidtlen+1;
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/* Add keys */
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for (i=0; i<cvec_len(cvk_val); i++){
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cv = cvec_i(cvk_val, i);
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if ((yk = yang_find(yt, Y_LEAF, cv_string_get(cv))) == NULL){
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clicon_err(OE_YANG, 0, "List key %s not found", cv_string_get(cv));
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goto done;
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}
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if (snmp_oid2str(&oidi, &oidilen, yk, cv) < 0)
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goto done;
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}
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if (oidilen != 0){
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clicon_err(OE_YANG, 0, "Expected oidlen 0 but is %zu", oidilen);
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goto fail;
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}
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/* Get scalar value */
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if (snmp_scalar_get(h, ys, cvk_val,
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defaultval,
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reqinfo,
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requests) < 0)
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goto done;
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// ok:
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retval = 1;
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done:
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if (cvk_val)
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cvec_free(cvk_val);
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if (xpath)
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free(xpath);
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return retval;
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fail:
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retval = 0;
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goto done;
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}
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/*! Find "next" objct from oids minus key and return that.
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* @param[in] h Clixon handle
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* @param[in] ylist Yang of table (of list type)
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* @param[in] oids OID of ultimate scalar value
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* @param[in] oidslen OID length of scalar
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* @retval -1 Error
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* @retval 0 OK
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*/
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static int
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snmp_table_getnext(clicon_handle h,
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yang_stmt *ylist,
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oid *oids,
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size_t oidslen,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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int retval = -1;
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cvec *nsc = NULL;
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char *xpath = NULL;
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cxobj *xt = NULL;
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cxobj *xerr;
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cxobj *xtable;
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cxobj *xrow;
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cxobj *xcol;
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yang_stmt *ycol;
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yang_stmt *ys;
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int ret;
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cvec *cvk_name;
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oid oidc[MAX_OID_LEN] = {0,}; /* Table / list oid */
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size_t oidclen = MAX_OID_LEN;
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oid oidk[MAX_OID_LEN] = {0,}; /* Key oid */
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size_t oidklen = MAX_OID_LEN;
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int getnext = 0;
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int found = 0;
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clicon_debug(1, "%s", __FUNCTION__);
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if ((ys = yang_parent_get(ylist)) == NULL ||
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yang_keyword_get(ys) != Y_CONTAINER){
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clicon_err(OE_YANG, EINVAL, "ylist parent is not list");
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goto done;
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}
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if (xml_nsctx_yang(ys, &nsc) < 0)
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goto done;
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if (snmp_yang2xpath(ys, NULL, &xpath) < 0)
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goto done;
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if (clicon_rpc_get(h, xpath, nsc, CONTENT_ALL, -1, &xt) < 0)
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goto done;
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if ((xerr = xpath_first(xt, NULL, "/rpc-error")) != NULL){
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clixon_netconf_error(xerr, "clicon_rpc_get", NULL);
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goto done;
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}
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if ((xtable = xpath_first(xt, nsc, "%s", xpath)) != NULL) {
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/* Make a clone of key-list, but replace names with values */
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if ((cvk_name = yang_cvec_get(ylist)) == NULL){
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clicon_err(OE_YANG, 0, "No keys");
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goto done;
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}
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xrow = NULL;
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while ((xrow = xml_child_each(xtable, xrow, CX_ELMNT)) != NULL) {
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/* Get key part of OID from XML list entry */
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if ((ret = snmp_xmlkey2val_oid(xrow, cvk_name, NULL, /*&cvk_oid,*/ oidk, &oidklen)) < 0)
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goto done;
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if (ret == 0)
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continue; /* skip row, not all indexes */
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xcol = NULL;
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while ((xcol = xml_child_each(xrow, xcol, CX_ELMNT)) != NULL) {
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if ((ycol = xml_spec(xcol)) == NULL)
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continue;
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if (yang_keyword_get(ycol) != Y_LEAF)
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continue;
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if ((ret = yangext_oid_get(ycol, oidc, &oidclen, NULL)) < 0)
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goto done;
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/* Append key oid */
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if (oid_append(oidc, &oidclen, oidk, oidklen) < 0)
|
||||
goto done;
|
||||
if (getnext){
|
||||
found++; /* return this */
|
||||
break;
|
||||
}
|
||||
/* Match oidc - key */
|
||||
if ((ret = oid_eq(oidc, oidclen, oids, oidslen)) == 0){
|
||||
getnext++; /* return next object if any */
|
||||
}
|
||||
else if (ret > 0){
|
||||
found++; /* return this */
|
||||
break;
|
||||
}
|
||||
} /* while xcol */
|
||||
if (found)
|
||||
break;
|
||||
} /* while xrow */
|
||||
}
|
||||
if (found){
|
||||
if (snmp_scalar_return(xcol, ycol, oidc, oidclen, reqinfo, requests) < 0)
|
||||
goto done;
|
||||
}
|
||||
retval = 0;
|
||||
done:
|
||||
if (xpath)
|
||||
free(xpath);
|
||||
if (xt)
|
||||
xml_free(xt);
|
||||
if (nsc)
|
||||
xml_nsctx_free(nsc);
|
||||
return retval;
|
||||
}
|
||||
#endif /* SNMP_TABLE_DYNAMIC */
|
||||
|
||||
/*! SNMP table operation handler
|
||||
* Callorder: 161,160,.... 0, 1,2,3, 160,161,...
|
||||
* see https://net-snmp.sourceforge.io/dev/agent/data_set_8c-example.html#_a0
|
||||
|
|
@ -374,7 +665,10 @@ clixon_snmp_table_handler(netsnmp_mib_handler *handler,
|
|||
cxobj *xt = NULL;
|
||||
cbuf *cb = NULL;
|
||||
int ret;
|
||||
|
||||
#ifdef SNMP_TABLE_DYNAMIC
|
||||
netsnmp_variable_list *requestvb;
|
||||
#endif
|
||||
|
||||
clicon_debug(2, "%s", __FUNCTION__);
|
||||
if ((ret = snmp_common_handler(handler, nhreg, reqinfo, requests, &sh, 1)) < 0)
|
||||
goto done;
|
||||
|
|
@ -382,30 +676,28 @@ clixon_snmp_table_handler(netsnmp_mib_handler *handler,
|
|||
clicon_debug(1, "%s Error table not registered", __FUNCTION__);
|
||||
goto ok;
|
||||
}
|
||||
#ifdef SNMP_TABLE_DYNAMIC
|
||||
requestvb = requests->requestvb;
|
||||
#endif
|
||||
switch(reqinfo->mode){
|
||||
case MODE_GET: // 160
|
||||
#ifdef SNMP_TABLE_DYNAMIC
|
||||
/* Register table sub-oid:s of existing entries in clixon */
|
||||
if (mibyang_table_poll(sh->sh_h, sh->sh_ys) < 0)
|
||||
/* Create xpath from YANG table OID + 1 + n + cvk/key = requestvb->name
|
||||
*/
|
||||
if ((ret = snmp_table_get(sh->sh_h, sh->sh_ys,
|
||||
requestvb->name, requestvb->name_length,
|
||||
reqinfo, requests)) < 0)
|
||||
goto done;
|
||||
#if 1
|
||||
{
|
||||
if ((ret = netsnmp_call_next_handler(handler, nhreg, reqinfo, requests)) < 0){
|
||||
clicon_err(OE_SNMP, ret, "netsnmp_call_next_handler");
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
if (ret == 0)
|
||||
netsnmp_set_request_error(reqinfo, requests, SNMP_NOSUCHINSTANCE);
|
||||
#endif
|
||||
// Wrong sh, need to make another call
|
||||
// if (snmp_scalar_get(sh->sh_h, sh->sh_ys, sh->sh_cvk_orig,
|
||||
// requestvb, sh->sh_default, reqinfo, requests) < 0)
|
||||
#endif
|
||||
// Then try and get actual scalar
|
||||
break;
|
||||
case MODE_GETNEXT: // 161
|
||||
#ifdef SNMP_TABLE_DYNAMIC
|
||||
/* Register table sub-oid:s of existing entries in clixon */
|
||||
if (mibyang_table_poll(sh->sh_h, sh->sh_ys) < 0)
|
||||
if (snmp_table_getnext(sh->sh_h, sh->sh_ys,
|
||||
requestvb->name, requestvb->name_length,
|
||||
reqinfo, requests) < 0)
|
||||
goto done;
|
||||
#endif
|
||||
break;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue