Hello,
We are developing a custom board based in YOCTO. We add several services that run perfect. We also added SNMP as you can see from the local.conf file.
# DO NOT SET THE MACHINE AFTER THE ABOVE INCLUDE
CORE_IMAGE_EXTRA_INSTALL += "plymouth"
PACKAGECONFIG:append_pn-php = " mysql sqlite3 imap opcache openssl ${@bb.utils.filter('DISTRO_FEATURES', 'ipv6 pam', d)} apache2"
IMAGE_INSTALL:append = " apache2"
#IMAGE_INSTALL:append = " phpmyadmin"
IMAGE_INSTALL:append = " php php-cli"
IMAGE_INSTALL:append = " php-modphp"
#IMAGE_INSTALL:append = " proftpd"
#IMAGE_INSTALL:append = " mysql5"
IMAGE_INSTALL:append = " net-snmp-server net-snmp-server-snmpd net-snmp-libs net-snmp-mibs"
IMAGE_INSTALL:append = " libgpiod libgpiod-tools"
IMAGE_INSTALL:append = " gdbserver"
# Remove connman
IMAGE_INSTALL:remove = " connman"
IMAGE_INSTALL:remove = " connman-client"
IMAGE_INSTALL:remove = " connman-gnome"
IMAGE_INSTALL:remove = " connman-plugin-wifi"
IMAGE_INSTALL:remove = " connman-plugin-ethernet"
IMAGE_INSTALL:remove = " connman-plugin-loopback"
SDKIMAGE_FEATURES = "dev-pkgs dbg-pkgs staticdev-pkgs"
ACCEPT_FSL_EULA = "1"
The daemon for SNMP is working properly, but we are in trouble to develop the agent from our application. We have generated the sdk with all the headers files.We source previous to run Eclipse the script provided by sdk “environment-setup-armv7at2hf-neon-tdx-linux-gnueabi” to configure enviromental settings, with this we can include those libraries.
We included in the libraries section (-l) of the linker configuration these libraries to link:
netsnmp
netsnmpmibs
netsnmpagent
netsnmphelpers
The issue is that when we call snmp_sess_init the program blocks and we have not any message about what is going on. Is there any module missed to include in the local.conf?. Is there any other module needed to add to local.conf?
Thank you for the ideas,
/*
* start be including the appropriate header files
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
/* change the word "define" to "undef" to try the (insecure) SNMPv1 version */
#undef DEMO_USE_SNMP_VERSION_3
#ifdef DEMO_USE_SNMP_VERSION_3
#include "net-snmp/transform_oids.h"
const char *our_v3_passphrase = "The Net-SNMP Demo Password";
#endif
bool test_snmp()
{
netsnmp_session session, *ss;
netsnmp_pdu *pdu;
netsnmp_pdu *response;
oid anOID[MAX_OID_LEN];
size_t anOID_len;
netsnmp_variable_list *vars;
int status;
int count=1;
/*
* Initialize the SNMP library
*/
init_snmp("snmpapp");
/*
* Initialize a "session" that defines who we're going to talk to
*/
snmp_sess_init( &session ); /* set up defaults */
session.peername = strdup("test.net-snmp.org");
/* set up the authentication parameters for talking to the server */
#ifdef DEMO_USE_SNMP_VERSION_3
/* Use SNMPv3 to talk to the experimental server */
/* set the SNMP version number */
session.version=SNMP_VERSION_3;
/* set the SNMPv3 user name */
session.securityName = strdup("MD5User");
session.securityNameLen = strlen(session.securityName);
/* set the security level to authenticated, but not encrypted */
session.securityLevel = SNMP_SEC_LEVEL_AUTHNOPRIV;
/* set the authentication method to MD5 */
session.securityAuthProto = usmHMACMD5AuthProtocol;
session.securityAuthProtoLen = sizeof(usmHMACMD5AuthProtocol)/sizeof(oid);
session.securityAuthKeyLen = USM_AUTH_KU_LEN;
/* set the authentication key to a MD5 hashed version of our
passphrase "The Net-SNMP Demo Password" (which must be at least 8
characters long) */
if (generate_Ku(session.securityAuthProto,
session.securityAuthProtoLen,
(u_char *) our_v3_passphrase, strlen(our_v3_passphrase),
session.securityAuthKey,
&session.securityAuthKeyLen) != SNMPERR_SUCCESS) {
snmp_perror(argv[0]);
snmp_log(LOG_ERR,
"Error generating Ku from authentication pass phrase. \n");
exit(1);
}
#else /* we'll use the insecure (but simplier) SNMPv1 */
/* set the SNMP version number */
session.version = SNMP_VERSION_1;
/* set the SNMPv1 community name used for authentication */
session.community = "demopublic";
session.community_len = strlen(session.community);
#endif /* SNMPv1 */
/*
* Open the session
*/
SOCK_STARTUP;
ss = snmp_open(&session); /* establish the session */
if (!ss) {
snmp_sess_perror("ack", &session);
SOCK_CLEANUP;
exit(1);
}
/*
* Create the PDU for the data for our request.
* 1) We're going to GET the system.sysDescr.0 node.
*/
pdu = snmp_pdu_create(SNMP_MSG_GET);
anOID_len = MAX_OID_LEN;
if (!snmp_parse_oid(".1.3.6.1.2.1.1.1.0", anOID, &anOID_len)) {
snmp_perror(".1.3.6.1.2.1.1.1.0");
SOCK_CLEANUP;
exit(1);
}
#if OTHER_METHODS
/*
* These are alternatives to the 'snmp_parse_oid' call above,
* e.g. specifying the OID by name rather than numerically.
*/
read_objid(".1.3.6.1.2.1.1.1.0", anOID, &anOID_len);
get_node("sysDescr.0", anOID, &anOID_len);
read_objid("system.sysDescr.0", anOID, &anOID_len);
#endif
snmp_add_null_var(pdu, anOID, anOID_len);
/*
* Send the Request out.
*/
status = snmp_synch_response(ss, pdu, &response);
/*
* Process the response.
*/
if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
/*
* SUCCESS: Print the result variables
*/
for(vars = response->variables; vars; vars = vars->next_variable)
print_variable(vars->name, vars->name_length, vars);
/* manipuate the information ourselves */
for(vars = response->variables; vars; vars = vars->next_variable) {
if (vars->type == ASN_OCTET_STR) {
char *sp = (char *)malloc(1 + vars->val_len);
memcpy(sp, vars->val.string, vars->val_len);
sp[vars->val_len] = '\0';
printf("value #%d is a string: %s\n", count++, sp);
free(sp);
}
else
printf("value #%d is NOT a string! Ack!\n", count++);
}
} else {
/*
* FAILURE: print what went wrong!
*/
if (status == STAT_SUCCESS)
fprintf(stderr, "Error in packet\nReason: %s\n",
snmp_errstring(response->errstat));
else if (status == STAT_TIMEOUT)
fprintf(stderr, "Timeout: No response from %s.\n",
session.peername);
else
snmp_sess_perror("snmpdemoapp", ss);
}
/*
* Clean up:
* 1) free the response.
* 2) close the session.
*/
if (response)
snmp_free_pdu(response);
snmp_close(ss);
SOCK_CLEANUP;
return (0);
}
Our hardware is:
Apalis iMX6D 1GB IT
Custom board base in Apalis Eval Board v1.1
Linux apalis-imx6-10806407 6.1.22-6.2.0 (Reference image Apalis-iMX6 tdx-reference-minimal-image)
