socket 指定网口收发数据

来源：互联网发布：常用的数据采集方法编辑：程序博客网时间：2024/05/22 14:01

在系统中，可能会有多片网口，工作在不同的网段，同时有不同的网关，socket需要绑定其中的一个网卡，进行网络的通信。

设置socket指定为eth1进行收发网络包：

#define INTERFAXENAME "eth1"    struct ifreq interface;    strncpy(interface.ifr_ifrn.ifrn_name, INTERFAXENAME, sizeof(INTERFAXENAME));    if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, (char *)&interface, sizeof(interface))  < 0) {           perror("SO_BINDTODEVICE failed");    }

demo程序如下：

#include <stdio.h>#include <string.h>#include <unistd.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <pthread.h>#include <netinet/in.h>#include <net/if.h>#include <linux/sockios.h>#include <sys/ioctl.h>#define BUF_SIZE    1024#define INTERFAXENAME "eth1"int sock;void * network_recv_thread(void * arg){    int n = 0;    char buff[BUF_SIZE];    struct sockaddr_in peer;    int len = sizeof(peer);    while(1)    {        n = recvfrom(sock, buff, BUF_SIZE, 0, (struct sockaddr *)&peer, &len);        if (n>0)        {            buff[n] = 0;            printf("received:");            puts(buff);        }        else if (n==0)        {            printf("server closed\n");            close(sock);            break;        }        else if (n == -1)        {            perror("recvfrom");            close(sock);            break;        }    }    return NULL;}int main(int argc, char *argv[]){    int ret = 0;        if (argc != 3)    {        printf("Usage: %s ip port\n", argv[0]);        exit(1);    }        printf("This is a UDP client\n");    if ( (sock=socket(AF_INET, SOCK_DGRAM, 0)) <0)    {        perror("socket");        exit(1);    }        struct ifreq interface;    strncpy(interface.ifr_ifrn.ifrn_name, INTERFAXENAME, sizeof(INTERFAXENAME));    if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, (char *)&interface, sizeof(interface))  < 0) {           perror("SO_BINDTODEVICE failed");    }        struct sockaddr_in addr;    addr.sin_family = AF_INET;    addr.sin_port = htons(atoi(argv[2]));    addr.sin_addr.s_addr = inet_addr(argv[1]);    if (addr.sin_addr.s_addr == INADDR_NONE)    {        printf("Incorrect ip address!");        close(sock);        exit(1);    }    pthread_t pid;    ret = pthread_create(&pid, NULL,network_recv_thread, NULL);    if (ret)    {        printf("Create pthread error!\n");        return 0;    }        char buff[BUF_SIZE];    int n = 0;    while (1)    {        gets(buff);        n = sendto(sock, buff, strlen(buff), 0, (struct sockaddr *)&addr, sizeof(addr));        if (n < 0)        {            perror("sendto");            close(sock);            break;        }    }    pthread_join(pid, NULL);    return 0;}

网络调试助手：

http://download.csdn.net/detail/ternence_hsu/9811625

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