c - 如何在 net-snmp C API 中创建用户？

Question

我正在用 C 语言编写一个 SNMP 守护进程，我想创建一个用户并授予其只读访问权限。我的配置中有以下几行:

createUser myuser SHA "12345678" AES
rouser myuser

如何在守护进程中用 C 语言执行相同的操作？

Answer 1

以下函数可以实现我想要的功能。我在头文件中找不到 vacm_parse_rouser() 的原型(prototype)，因此我将其添加到我的代码中。

void vacm_parse_rouser( const char *token, char *confline );

bool create_user_and_access()
{
    const char* username = "myuser";
    const char* auth_type = "SHA";
    char auth_pass[] = "12345678";
    const char* priv_type = "AES";
    char priv_pass[] = "12345678";
    struct usmUser* user;
    int type_nr;
    const oid* auth;
    netsnmp_priv_alg_info *pai;
    char line[128];

    user = usm_create_user();
    user->engineID = snmpv3_generate_engineID( &user->engineIDLen );
    user->name = strdup( username );
    user->secName = strdup( user->name );

    type_nr = usm_lookup_auth_type( auth_type );
    if( type_nr < 0 )
    {
        printf( "usm_lookup_auth_type %s failed.\n", auth_type );
        return false;
    }
    auth = sc_get_auth_oid( type_nr, &user->authProtocolLen );
    if( !auth )
    {
        printf( "sc_get_auth_oid %d (%s) failed.\n", type_nr, auth_type );
        return false;
    }
    user->authProtocol = snmp_duplicate_objid( auth, user->authProtocolLen );
    usm_set_user_password( user, "userSetAuthPass", auth_pass );

    type_nr = usm_lookup_priv_type( priv_type );
    if( type_nr < 0 )
    {
        printf( "usm_lookup_priv_type %s failed.\n", priv_type );
        return false;
    }
    pai = sc_get_priv_alg_bytype( type_nr );
    if( !pai )
    {
        printf( "sc_get_priv_alg_bytype %d (%s) failed.\n",
                type_nr, priv_type );
        return false;
    }
    user->privProtocolLen = pai->oid_len;
    user->privProtocol =
            snmp_duplicate_objid( pai->alg_oid, user->privProtocolLen );
    usm_set_user_password( user, "userSetPrivPass", priv_pass );

    usm_add_user( user );

    strcpy( line, username );
    vacm_parse_rouser( "rouser", line );

    return true;
}