Difference between revisions of "Command Line Calling Order"
From Net-SNMP Wiki
(example structure from snmp apps) |
(expand snmp_parse_args) |
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| Line 15: | Line 15: | ||
snmp_parse_args(argv, argc, &session, ...); // accepts argv, argc, a session to initialize and optional additional arguments | snmp_parse_args(argv, argc, &session, ...); // accepts argv, argc, a session to initialize and optional additional arguments | ||
| + | <font color="black">snmp_sess_init(session); | ||
| + | getopt(); // and process | ||
| + | init_snmp("snmpapp"); // change to your app name if something special | ||
| + | // setup special session params | ||
| + | // like v3/[[USM]] keys | ||
| + | |||
| + | session->peername = NEXT_ARGV_AFTER_OPTS | ||
| + | |||
| + | </font> | ||
SOCK_STARTUP; // a win32 specific required macro | SOCK_STARTUP; // a win32 specific required macro | ||
Revision as of 23:18, 17 February 2010
Most of the Net-SNMP command line applications (like snmpget, snmpwalk, snmpset, ...) have similar internal code. This page describes the calling structure of these applications. If you're writing your own applications this should help you understand the process flow of the applications.
Comments are written in // style for simplicity, but obviously this isn't callable code anyway...
Code in blue is application code, and code in black is functions called by the library code.
main()
netsnmp_session session, *ss;
netsnmp_pdu *pdu;
netsnmp_pdu *response;
netsnmp_variable_list *vars;
// the only thing you can do before snmp_parse_args is call the netsnmp_ds_set_(bool|int|string) functions
snmp_parse_args(argv, argc, &session, ...); // accepts argv, argc, a session to initialize and optional additional arguments
snmp_sess_init(session);
getopt(); // and process
init_snmp("snmpapp"); // change to your app name if something special
// setup special session params
// like v3/USM keys
session->peername = NEXT_ARGV_AFTER_OPTS
SOCK_STARTUP; // a win32 specific required macro ss = snmp_open(&session); pdu = snmp_pdu_create(SNMP_MSG_(GET|SET|GETNEXT|...)); snmp_add_null_var(pdu, ...); // adding in variables you want to get/set status = snmp_sync_response(ss, pdu, &response); // Note: pdu is "consumed" by this call; don't use it again! // results are in the response list, assuming no errors. See the snmpget code for example error handling if (response) snmp_free_pdu(response); snmp_close(ss); SOCK_CLEANUP;
