Linux涓媢dp缂栫▼

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鏍囩锛?a href='http://www.mamicode.com/so/1/%e7%ab%af%e5%8f%a3' title='绔彛'>绔彛   int   tcp   绋嬪簭   net   鍘熷瀷   define   

涓€銆佸嚱鏁?/p>

1銆乺ecvfrom鍑芥暟

UDP浣跨敤recvfrom()鍑芥暟鎺ユ敹鏁版嵁锛屼粬绫讳技浜庢爣鍑嗙殑read()锛屼絾鏄湪recvfrom()鍑芥暟涓鎸囨槑鐩殑鍦板潃銆?/p> 

#include <sys/types.h>
#include <sys/socket.h>

ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags,
                        struct sockaddr *src_addr, socklen_t *addrlen);
//杩斿洖鍙戦€佹暟鎹殑闀垮害 锛嶉潪0鎴愬姛銆€銆€銆€-1锛嶅け璐?/span>

2銆乻endto鍑芥暟

UDP浣跨敤sendto()鍑芥暟鍙戦€佹暟鎹紝浠栫被浼间簬鏍囧噯鐨剋rite()锛屼絾鏄湪sendto()鍑芥暟涓鎸囨槑鐩殑鍦板潃

#include <sys/types.h>
#include <sys/socket.h>

ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
                      const struct sockaddr *dest_addr, socklen_t addrlen);
//杩斿洖鍙戦€佹暟鎹殑闀垮害 锛嶉潪0鎴愬姛銆€銆€銆€-1锛嶅け璐?/span>

3銆乻ocket鍑芥暟

#include <sys/types.h>
#include <sys/socket.h>

//鍑芥暟鍘熷瀷
int socket(int domain, int type, int protocol);

涓轰簡鎵ц缃戠粶杈撳叆杈撳嚭锛屼竴涓繘绋嬪繀椤诲仛鐨勭涓€浠朵簨灏辨槸璋冪敤socket鍑芥暟鑾峰緱涓€涓枃浠舵弿杩扮銆?/strong>

绗竴涓弬鏁版寚鏄庝簡鍗忚绨囷紝鐩墠鏀寔5绉嶅崗璁皣锛屾渶甯哥敤鐨勬湁AF_INET(IPv4鍗忚)鍜孉F_INET6(IPv6鍗忚)銆?/p>

绗簩涓弬鏁版寚鏄庡鎺ュ瓧绫诲瀷锛屾湁涓夌绫诲瀷鍙€夛細SOCK_STREAM(瀛楄妭娴佸鎺ュ彛)銆丼OCK_DGRAM(鏁版嵁鎶ュ鎺ュ彛)鍜孲OCK_RAW(鍘熷濂楁帴鍙?锛汿CP涓€鑸€夋嫨SOCK_STREAM锛岃€孶DP閫夋嫨SOCK_DGRAM銆?/p>

4銆乥ind鍑芥暟

#include <sys/types.h>
#include <sys/socket.h>

int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen);

绗竴涓弬鏁版槸socket鍑芥暟杩斿洖鐨勫鎺ュ瓧鐨勬枃浠舵弿杩扮銆傜浜屽拰绗笁涓弬鏁板垎鍒槸涓€涓寚鍚戠壒瀹氫簬鍗忚鐨勫湴鍧€缁撴瀯鐨勬寚閽堝拰璇ュ湴鍧€缁撴瀯鐨勯暱搴︺€?/p>

5銆?span class="hljs-title">sockaddr_in 

#include <netinet/in.h>
#include <arpa/inet.h>
struct sockaddr_in 
{
    sa_family_t sin_family; //鍦板潃鏃忥紙Address Family锛?/span>
    uint16_t sin_port ; //16浣?TCP/IP 绔彛鍙?/span>
    struct in_addr sin_addr; //32浣?IP 鍦板潃
    char sin_zero[8]; 
};

 

浜屻€乻erver.c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netinet/ip.h>
#include<unistd.h>
#include<arpa/inet.h>
#include <sys/time.h>    
#include <unistd.h>

#define UDP_PORT  8080
#define UDP_BUF_SIZE  100
#define UDP_SERV_IP_ADDR  "192.168.100.178"
#define UDP_CLIENT_IP_ADDR  "192.168.100.51"


int
main(void)
{
    int fd = -1;
    int len = 0;
    int res = 0;
    int i;
    struct sockaddr_in sin;

    /*  鍒涘缓socket_fd   */
    if((fd = socket( AF_INET, SOCK_DGRAM , 0)) < 0)
    {
        printf("*******SOCKET********
");
        return -1;
    }
    
    /*  鍏佽缁戝畾鍦板潃蹇€熼噸鐢?  */
    int b_reuse = 1;
    setsockopt( fd, SOL_SOCKET, SO_REUSEADDR, &b_reuse, sizeof(b_reuse));

    /*   濉厖struct sockaddr_in 缁撴瀯浣撳彉閲?  */
    bzero( &sin, sizeof(sin));
    sin.sin_family = AF_INET;
    sin.sin_port = htons(UDP_PORT);
    /*  璁╂湇鍔″櫒绋嬪簭鑳界粦瀹氬湪浠绘剰鐨処P涓?   */
#if    1
    sin.sin_addr.s_addr = htonl(INADDR_ANY);//缁戝畾浠讳綍涓绘満涓奿p鍦板潃
#else
    if((inet_pton(AF_INET, UDP_SERV_IP_ADDR, (void *)&sin.sin_addr)) < 0)
    {
        printf("******INET_PTON*******
");
        return -1;
    }
#endif
    /*  缁戝畾  */
    if(bind (fd, (struct sockaddr *)&sin, sizeof(sin)) <0 )
    {
        printf("*******bind*******
");
        return -1;
    }


    char buf[UDP_BUF_SIZE];
    struct sockaddr_in cin;
    socklen_t addrlen = sizeof(cin);

    while(1)
    {
        bzero(buf ,UDP_BUF_SIZE);銆€銆€銆€銆€銆€

銆€銆€銆€銆€銆€銆€memset(buf,0,sizeof(buf));

銆€銆€銆€銆€銆€銆€len=0;

          len = recvfrom(fd, buf, UDP_BUF_SIZE-1,0,(struct sockaddr*)&cin, &addrlen);

銆€銆€銆€銆€銆€if(len > 0)
        {
            char ipv4_addr[16];
            if(!inet_ntop(AF_INET, (void *)&cin.sin_addr, ipv4_addr, sizeof(cin)))
            {
                printf("*******inet_ntop********
");
                return -1;
            }

            printf("********recv from (%s:%d), date:",ipv4_addr, ntohs(sin.sin_port));
            
            for(i = 0;i< len;i++)
              printf("%02X ", buf[i]);
            printf("
");
        }
銆€銆€銆€銆€sendto(fd,buf,len,0,(struct sockaddr*)&cin, addrlen);        
    }

    close(fd);

    return 0;
}

 

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