代码怎么理解···初学者初学···求高手帮忙

代码如何理解···菜鸟初学···求高手帮忙
下列代码如何理解，是否可用类C进行编写。

[sigma]# dig @ 10.1.1.100 version.bind chaos txt
;<<>\>Dig 8.1 <<>\>@ 10.1.1.100 version.bind chaos txt
;{ 1 server found }
;;res options: init recurs defnam dnsrch
;;got answer:
;;->\>HEADER<<- opcode: QUERY, status: NOERROR, id: 10
;;flags: qr aa rd ra ; QUERY: 1, ANSWER: 1,AUTHORITY: 0,ADDITIONAL: 0
;;QUERY SECTION:
;;version.bind, type-txt, class-CHAOS
;;ANSWER SECTION:
  VERSION BIND, OS CHAOS TXT “8.2.2”

 [itchy]# nolookup
  Defailt server:localhost.attackers.org
  Address: 127.0.0.1
> server 10.1.1.100
Default server:dns.victim.net
Address: 10.1.1.100
> hash.attackers.org
Server:dns.victim.net
Address:10.1.1.100

在贴一点 还是没贴完

C/C++ code

void

dighost_shutdown(void) {

        isc_event_t *event = global_event;
        flush_lookup_list();

        debug("dighost_shutdown()");
        if (!in_use) {

                isc_app_shutdown();

                return;

        }
        isc_task_send(global_task, &event);

}
static void

printsoa(dns_rdata_t *rdata) {

        dns_rdata_soa_t soa;

        isc_result_t result;

        char namebuf[DNS_NAME_FORMATSIZE];
        result = dns_rdata_tostruct(rdata, &soa, NULL);

        check_result(result, "dns_rdata_tostruct");
        dns_name_format(&soa.origin, namebuf, sizeof(namebuf));

        printf("\torigin = %s\n", namebuf);

        dns_name_format(&soa.contact, namebuf, sizeof(namebuf));

        printf("\tmail addr = %s\n", namebuf);

        printf("\tserial = %u\n", soa.serial);

        printf("\trefresh = %u\n", soa.refresh);

        printf("\tretry = %u\n", soa.retry);

        printf("\texpire = %u\n", soa.expire);

        printf("\tminimum = %u\n", soa.minimum);

        dns_rdata_freestruct(&soa);

}
static void

printa(dns_rdata_t *rdata) {

        isc_result_t result;

        char text[sizeof("255.255.255.255")];

        isc_buffer_t b;
        isc_buffer_init(&b, text, sizeof(text));

        result = dns_rdata_totext(rdata, NULL, &b);

        check_result(result, "dns_rdata_totext");

        printf("Address: %.*s\n", (int)isc_buffer_usedlength(&b),

               (char *)isc_buffer_base(&b));

}

#ifdef DIG_SIGCHASE

/* Just for compatibility : not use in host program */

isc_result_t

printrdataset(dns_name_t *owner_name, dns_rdataset_t *rdataset,

              isc_buffer_t *target)

{

        UNUSED(owner_name);

        UNUSED(rdataset);

        UNUSED(target);

        return(ISC_FALSE);

}

#endif

static void

printrdata(dns_rdata_t *rdata) {

        isc_result_t result;

        isc_buffer_t *b = NULL;

        unsigned int size = 1024;

        isc_boolean_t done = ISC_FALSE;
        if (rdata->type < N_KNOWN_RRTYPES)

                printf("%s", rtypetext[rdata->type]);

        else

                printf("rdata_%d = ", rdata->type);
        while (!done) {

                result = isc_buffer_allocate(mctx, &b, size);

                if (result != ISC_R_SUCCESS)

                        check_result(result, "isc_buffer_allocate");

                result = dns_rdata_totext(rdata, NULL, b);

                if (result == ISC_R_SUCCESS) {

                        printf("%.*s\n", (int)isc_buffer_usedlength(b),

                               (char *)isc_buffer_base(b));

                        done = ISC_TRUE;

                } else if (result != ISC_R_NOSPACE)

                        check_result(result, "dns_rdata_totext");

                isc_buffer_free(&b);

                size *=