4、獲得地址信息

/*?來源:?http://www.jfox.info/c/a/ic/18071a.html?*/

#include?

#include??/*?for?strncpy?*/

#include?

#include?

#include?

#include?

#include?

int

main()

{

int?fd;

struct?ifreq?ifr;

fd?=?socket(AF_INET,?SOCK_DGRAM,?0);

/*?I?want?to?get?an?IPv4?IP?address?*/

ifr.ifr_addr.sa_family?=?AF_INET;

/*?I?want?IP?address?attached?to?"eth0"?*/

strncpy(ifr.ifr_name,?"eth0",?IFNAMSIZ-1);

ioctl(fd,?SIOCGIFADDR,?&ifr);

close(fd);

/*?display?result?*/

printf("%s\n",?inet_ntoa(((struct?sockaddr_in?*)&ifr.ifr_addr)->sin_addr));

return?0;

}

5、獲得地址信息的錯誤處理?#include?

/*?來源:?http://www.jfox.info/c/a/ic/18071a.html?*/

#include?

#include?

#include?

int

main()

{

char?*hostname?=?"localhost";

struct?addrinfo?hints,?*res;

struct?in_addr?addr;

int?err;

memset(&hints,?0,?sizeof(hints));

hints.ai_socktype?=?SOCK_STREAM;

hints.ai_family?=?AF_INET;

if?((err?=?getaddrinfo(hostname,?NULL,?&hints,?&res))?!=?0)?{

printf("error?%d\n",?err);

return?1;

}

addr.s_addr?=?((struct?sockaddr_in?*)(res->ai_addr))->sin_addr.s_addr;

printf("ip?address?:?%s\n",?inet_ntoa(addr));

freeaddrinfo(res);

return?0;

}

6、創建socket地址

/*?來源:?http://www.jfox.info/c/a/ic/18071a.html?*/

#include?

#include?

#include?

#include?

int

main()

{

char?*hostname?=?"localhost";

char?*service?=?"80";

struct?addrinfo?hints,?*res;

int?err;

int?sock;

memset(&hints,?0,?sizeof(hints));

hints.ai_socktype?=?SOCK_STREAM;

hints.ai_family?=?AF_INET;

if?((err?=?getaddrinfo(hostname,?service,?&hints,?&res))?!=?0)?{

printf("error?%d?:?%s\n",?err,?gai_strerror(err));

return?1;

}

sock?=?socket(res->ai_family,?res->ai_socktype,?res->ai_protocol);

if?(sock?

perror("socket");

return?1;

}

if?(connect(sock,?res->ai_addr,?res->ai_addrlen)?!=?0)?{

perror("connect");

return?1;

}

freeaddrinfo(res);

return?0;

}

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