ipv4interfacetable_subagent.c

开发snmp的开发包有两个开放的SNMP开发库

/*
 * Note: this file originally auto-generated by mib2c using
 *       version : 1.7 $ of : subagent.m2c,v $ 
 */
/*
 * standard Net-SNMP includes 
 */
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>

/*
 * include our parent header 
 */
#include "ipv4InterfaceTable.h"

#include <signal.h>

static int      keep_running;

static          RETSIGTYPE
stop_server(int a)
{
    keep_running = 0;
}

static void
usage(void)
{
    printf
        ("usage: ipv4InterfaceTable [-D<tokens>] [-f] [-L] [-M] [-H] [LISTENING ADDRESSES]\n"
         "\t-f      Do not fork() from the calling shell.\n"
         "\t-DTOKEN[,TOKEN,...]\n"
         "\t\tTurn on debugging output for the given TOKEN(s).\n"
         "\t\tWithout any tokens specified, it defaults to printing\n"
         "\t\tall the tokens (which is equivalent to the keyword 'ALL').\n"
         "\t\tYou might want to try ALL for extremely verbose output.\n"
         "\t\tNote: You can't put a space between the -D and the TOKENs.\n"
         "\t-H\tDisplay a list of configuration file directives\n"
         "\t\tunderstood by the agent and then exit.\n"
         "\t-M\tRun as a normal SNMP Agent instead of an AgentX sub-agent.\n"
         "\t-x ADDRESS\tconnect to master agent at ADDRESS (default NETSNMP_AGENTX_SOCKET).\n"
         "\t-L\tDo not open a log file; print all messages to stderr.\n");
    exit(0);
}

int
main(int argc, char **argv)
{
    int             agentx_subagent = 1;        /* change this if you want to be a SNMP master agent */
    /*
     * Defs for arg-handling code: handles setting of policy-related variables 
     */
    int             ch;
    extern char    *optarg;
    int             dont_fork = 0, use_syslog = 0;
    char           *agentx_socket = NULL;

    while ((ch = getopt(argc, argv, "D:fHLMx:")) != EOF)
        switch (ch) {
        case 'D':
            debug_register_tokens(optarg);
            snmp_set_do_debugging(1);
            break;
        case 'f':
            dont_fork = 1;
            break;
        case 'H':
            netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
                                   NETSNMP_DS_AGENT_NO_ROOT_ACCESS, 1);
            init_agent("ipv4InterfaceTable");   /* register our .conf handlers */
            init_ipv4InterfaceTable();
            init_snmp("ipv4InterfaceTable");
            fprintf(stderr, "Configuration directives understood:\n");
            read_config_print_usage("  ");
            exit(0);
        case 'M':
            agentx_subagent = 0;
            break;
        case 'L':
            use_syslog = 0;     /* use stderr */
            break;
        case 'x':
            agentx_socket = optarg;
            break;
        default:
            fprintf(stderr, "unknown option %c\n", ch);
            usage();
        }

    if (optind < argc) {
        int             i;
        /*
         * There are optional transport addresses on the command line.  
         */
        DEBUGMSGTL(("snmpd/main", "optind %d, argc %d\n", optind, argc));
        for (i = optind; i < argc; i++) {
            char           *c, *astring;
            if ((c = netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
                                           NETSNMP_DS_AGENT_PORTS))) {
                astring = malloc(strlen(c) + 2 + strlen(argv[i]));
                if (astring == NULL) {
                    fprintf(stderr, "malloc failure processing argv[%d]\n",
                            i);
                    exit(1);
                }
                sprintf(astring, "%s,%s", c, argv[i]);
                netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
                                      NETSNMP_DS_AGENT_PORTS, astring);
                SNMP_FREE(astring);
            } else {
                netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
                                      NETSNMP_DS_AGENT_PORTS, argv[i]);
            }
        }
        DEBUGMSGTL(("snmpd/main", "port spec: %s\n",
                    netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
                                          NETSNMP_DS_AGENT_PORTS)));
    }

    /*
     * we're an agentx subagent? 
     */
    if (agentx_subagent) {
        /*
         * make us a agentx client. 
         */
        netsnmp_enable_subagent();
        if (NULL != agentx_socket)
            netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
                                  NETSNMP_DS_AGENT_X_SOCKET,
                                  agentx_socket);
    }

    snmp_disable_log();
    if (use_syslog)
        snmp_enable_calllog();
    else
        snmp_enable_stderrlog();

    /*
     * daemonize 
     */
    if (!dont_fork) {
        int             rc = netsnmp_daemonize(1, !use_syslog);
        if (rc)
            exit(-1);
    }

    /*
     * initialize tcp/ip if necessary 
     */
    SOCK_STARTUP;

    /*
     * initialize the agent library 
     */
    init_agent("ipv4InterfaceTable");

    /*
     * init ipv4InterfaceTable mib code 
     */
    init_ipv4InterfaceTable();

    /*
     * read ipv4InterfaceTable.conf files. 
     */
    init_snmp("ipv4InterfaceTable");

    /*
     * If we're going to be a snmp master agent, initial the ports 
     */
    if (!agentx_subagent)
        init_master_agent();    /* open the port to listen on (defaults to udp:161) */

    /*
     * In case we recevie a request to stop (kill -TERM or kill -INT) 
     */
    keep_running = 1;
    signal(SIGTERM, stop_server);
    signal(SIGINT, stop_server);

    /*
     * you're main loop here... 
     */
    while (keep_running) {
        /*
         * if you use select(), see snmp_select_info() in snmp_api(3) 
         */
        /*
         * --- OR ---  
         */
        agent_check_and_process(1);     /* 0 == don't block */
    }

    /*
     * at shutdown time 
     */
    snmp_shutdown("ipv4InterfaceTable");
    SOCK_CLEANUP;
    exit(0);
}