Jeremiah的小程序之一：Linux下获取本机的IP地址

/*******************************************************************************  
 * Filename:        get_ip.c  
 * Created on:      Feb 8, 2010  
 * Author:          Jeremiah  
 * Description:     获取本机IP地址  
 *  
 ******************************************************************************/ 
 
#include <stdio.h>  
#include <stdint.h>  
#include <stdlib.h>  
#include <unistd.h>  
#include <sys/socket.h> 
拥有帝国一切，皆有可能。欢迎访问phome.net 
#include <netinet/in.h>  
#include <arpa/inet.h>  
#include <string.h>  
#include <sys/time.h>  
#include <sys/select.h>  
 
in_addr_t ourIPAddress();  
int setupDatagramSocket(uint16_t);  
uint8_t socketJoinGroup(int socket, uint32_t groupAddress);  
uint8_t writeSocket(int socket, struct in_addr address, uint32_t port,  
        uint8_t ttlArg, unsigned char *buffer, unsigned bufferSize);  
int readSocket(int socket, unsigned char *buffer, unsigned bufferSize,  
        struct sockaddr_in *fromAddress, struct timeval *timeout);  
int blockUntilReadable(int socket, struct timeval* timeout);  
uint8_t badAddress(uint32_t addr);  
uint8_t socketLeaveGroup(int socket, uint32_t groupAddress);  
uint8_t IsMulticastAddress(uint32_t address);  
拥有帝国一切，皆有可能。欢迎访问phome.net
 
#define SET_SOCKADDR_SIN_LEN(var)  
#define MAKE_SOCKADDR_IN(var,adr,prt) /*adr,prt must be in network order*/  
    struct sockaddr_in var;  
    var.sin_family = AF_INET;  
    var.sin_addr.s_addr = (adr);  
    var.sin_port = (prt);  
    SET_SOCKADDR_SIN_LEN(var);  
 
int main(int argc, char **argv) {  
    struct sockaddr_in ourAddress;  
    ourAddress.sin_addr.s_addr = ourIPAddress();  
 
    if (ourAddress.sin_addr.s_addr == 0) {  
        printf("get local ip error!n");  
        return 1;  
    }  
 
    printf("%sn", inet_ntoa(ourAddress.sin_addr));  
 
    return 0;  
}  
 
in_addr_t ourIPAddress() {  
    uint32_t ourAddress = 0;  
    int sock = -1;  

拥有帝国一切，皆有可能。欢迎访问phome.net    struct in_addr testAddr;  
    struct sockaddr_in fromAddr;  
    fromAddr.sin_addr.s_addr = 0;  
 
    // Get our address by sending a (0-TTL) multicast packet,  
    // receiving it, and looking at the source address used.  
    // (This is kinda bogus, but it provides the best guarantee  
    // that other nodes will think our address is the same as we do.)  
    testAddr.s_addr = inet_addr("228.67.43.92");  
    uint16_t testPort = 15948;  
    sock = setupDatagramSocket(testPort);  
    if (sock < 0) {  
        return 0;  
    }  
 
    if (!socketJoinGroup(sock, testAddr.s_addr)) {  
        return 0;  
    }  
 
    unsigned char testString[] = "hostIdTest";  
    unsigned testStrLength = sizeof(testString);  
    if

凌众科技专业提供服务器租用、服务器托管、企业邮局、虚拟主机等服务，公司网站：http://www.lingzhong.cn 为了给广大客户了解更多的技术信息，本技术文章收集来源于网络,凌众科技尊重文章作者的版权，如果有涉及你的版权有必要删除你的文章，请和我们联系。以上信息与文章正文是不可分割的一部分,如果您要转载本文章,请保留以上信息，谢谢!