network terminal command

1. nslookup

nslookup wayne.edu
Server: 141.217.43.24
Address: 141.217.43.24#53

Non-authoritative answer:
Name: wayne.edu
Address: 141.217.1.22

网络会议 (Web meeting)

网络会议（web meeting）

1. 现有公司和软件：

  mikogo: http://www.mikogo.net.cn/download/mac-download/
2. 局域网桌面监控软件
http://www.louyue.com/lan-desktop.htm

Get IP address, Hostname, alias, execution time

Run: ./getaddress.o www.wayne.edu
Result:
excution time: 0.553000 millseconds
offical hostname: web-prod.wayne.edu
alias: www.wayne.edu
ddress: 141.217.1.22

Getaddress.o Code:

#include <stdio.h>

#include <netdb.h>

#include <arpa/inet.h>

#include <time.h>

int main(int argc, char **argv)

{

char *ptr, **pptr;

struct hostent *hptr;

char str[32]; // for IPv4 and IPv6

clock_t start, end; //start clock, and end clock

while (--argc) {

ptr = *++argv;

start = clock();

if ((hptr = gethostbyname(ptr)) == NULL) {

printf("gethostbyname error");

continue;

}

end = clock();

printf("excution time: %f millseconds\n",(double)1000*(end-start)/CLOCKS_PER_SEC);

printf("offical hostname: %s\n",hptr->h_name);

for (pptr=hptr->h_aliases; *pptr != NULL; pptr++) {

printf("\talias: %s\n",*pptr);

}

switch (hptr->h_addrtype) {

case AF_INET:

pptr = hptr->h_addr_list;

for (; *pptr != NULL; pptr++) {

printf("\address: %s\n",inet_ntop(hptr->h_addrtype, *pptr, str, sizeof(str)));

}

break;

default:

break;

}

}

exit(0);

}