如何获取外网的IP和DNS？

2017-07-27

编译:$gcc -o dns dns。c运行：$。/dns www。avnads。cn$。/dns 192。168。0。8（我的内网IP）程序：#include#include#include#include#include#include#include#includeint main(int argc ,char *argv[]){struct sockaddr_in addr;struct hostent *host;char **alias;if(argc!=2){fprintf(stderr,"Usage:%s hostname|ip。 。...全部

#include struct hostent far *pascal far gethostbyaddr(const char far * addr, int len, int type)操作系统课的实验（银行家算法）#include "malloc.h"#include "stdio.h"#include "stdlib.h"#define alloclen sizeof(struct allocation)#define maxlen sizeof(struct max)#define avalen sizeof(struct available)#define needlen sizeof(struct need)#define finilen sizeof(struct finish)#define pathlen sizeof(struct path)struct allocation{int value struct sockaddr_in *addr = (struct sockaddr_in*)[data bytes]

注释： gethostbyaddr()返回对应于给定地址的包括主机名字跟地址信息的hostent结构指针参见： accept(), bind(), connect(), getsockname(), getsockopt(), setsockopt(), listen(), recv(), recvfrom(), select(), send(), sendto(), shutdown(), ioctlsocket().4.2 例程5.2 函数5.2.1 gethostbyaddr()简述： 返回对应于给定地址的主机信息if (inet_aton(argv[1], (struct in_addr*)&dest.sin_addr.s_addr) == 0)

sin_addr),4,AF_INET);printf("Address information of Ip %s\n",argv[1]);}else{/* 否则用户需要输入的是域名，通过域名找主机信息*/host=gethostbyname(argv[1]);printf("Address information of host %s\n",argv[1]);}if(host==NULL){/* 都不是,算了不找了*/printf("No Information found");exit(1);}/*打印主机正式名称*/printf("Official host name:\n%s\n\n",host->h_name);/*打印主机其它名称*/printf("Name aliases:\n");for(alias=host->h_aliases;*alias!=NULL;alias++)printf("%s\n",*alias);/*打印主机系列IP*/printf("\nIp address:\n");for(alias=host->h_addr_list;*alias!=NULL;alias++)printf("%s\n",inet_ntoa(*(struct in_addr *)(*alias)));}。

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