获取本机ip地址

来源：互联网发布：讯飞输入法皮肤知乎编辑：程序博客网时间：2024/06/11 23:35

环境: Fedora12

#include <stdio.h>#include <string.h>#include <unistd.h>#include <sys/socket.h>#include <arpa/inet.h>#include <net/if.h>#include <netinet/in.h>#include <sys/ioctl.h>// 获取本机ip地址int get_ipaddr(char * interface_name, char * ip, int len){int s;struct ifreq ifr;struct sockaddr_in ptr;if(len < 16) {printf("The ip need 16 byte !\n");return -1;}if((s = socket(PF_INET, SOCK_STREAM, 0)) < 0) {return -1;}strcpy(ifr.ifr_name, interface_name);if(ioctl(s, SIOCGIFADDR, &ifr) < 0) {printf("get_ipaddr ioctl error\n");close(s);return -1;}//ptr = (struct sockaddr_in *)&ifr.ifr_ifru.ifru_netmask;memcpy(&ptr, &ifr.ifr_ifru.ifru_netmask, sizeof(struct sockaddr_in));snprintf(ip, len, "%s", inet_ntoa(ptr.sin_addr));close(s);return 0;}int main(int argc, char** argv){char *iname = "eth0";char ipstr[32] = {0};int ret;printf("%d, %d\n", sizeof(struct sockaddr), sizeof(struct sockaddr_in));ret = get_ipaddr(iname, ipstr, sizeof(ipstr));printf("ret=%d, ip=[%s]\n", ret, ipstr);return 0;}

运行结果:

[zcm@t1 #43]$makegcc -g -O2 -Wall -fsigned-char -Wno-unused -o a a.c[zcm@t1 #44]$./a16, 16ret=0, ip=[192.168.1.91][zcm@t1 #45]$

参考几个挺有用的总结:

http://blog.csdn.net/joker0910/article/details/7855998

http://blog.csdn.net/kulung/article/details/6442597

http://blog.chinaunix.net/uid-25100840-id-2377089.html

http://baike.baidu.com/view/3321163.htm