Linux下删除virtual vlan interface

最新推荐文章于 2024-08-14 19:55:44 发布

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该博客介绍如何在Linux系统中删除virtual VLAN interface。通过读取'/proc/net/vlan/config'文件获取接口信息，然后使用socket和ioctl调用SIOCSIFVLAN命令来移除指定的虚拟接口。

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/route.h>
#include <linux/if_vlan.h>
#include <linux/sockios.h>
#include <fcntl.h>
#include <errno.h>

#define    MAX_BUF_SIZE             4096

void check_and_remove_interface(const char *if_name);
int remove_virtual_interface(const char *if_name);


void check_and_remove_interface(const char *if_name)
{
    char buf[MAX_BUF_SIZE];
    char name[IFNAMSIZ];
    char eth[IFNAMSIZ];
    int ret = -1;
    FILE *fp;

    fp = fopen("/proc/net/vlan/config", "r");
    if (fp == NULL)
    {
        printf("fopen() error: %s\n", strerror(errno));
        return;
    }

    while ((fgets(buf, sizeof(buf), fp)) != NULL)
    {
        char *pbegin = buf;
        while (pbegin < buf + sizeof(buf) - 1 && *pbegin == ' ')
        {
            ++pbegin;
        }

        memset(eth, '\0', sizeof(eth));
        memset(name, '\0', sizeof(name));
        char *pend = strchr(buf, '|');
        char *prbegin = strrchr(buf, '|');
        if (pend != NULL && prbegin != NULL && pend != prbegin)
        {
            --pend;
            ++prbegin;
        }
        else
        {
            continue;
        }

        while (pend > pbegin && isspace(*pend))
        {
            --pend;
        }

        while (prbegin < buf + sizeof(buf) - 1 && isspace(*prbegin))
        {
            ++prbegin;
        }

        if (pbegin < pend && prbegin < buf + sizeof(buf) - strlen(if_name) - 1)
        {
            strncpy(name, pbegin, pend - pbegin + 1);
            strncpy(eth, prbegin, strlen(if_name));
            if (strcmp(eth, if_name) == 0)
            {
                ret = remove_virtual_interface(name);
                if (ret == 0)
                {
                    printf("Remove virtual interface %s successfully!\n", name);
                }
                else
                {
                    printf("Remove virtual interface %s failed!\n", name);
                }                     
            }
        }
    }

    fclose(fp);
}

int remove_virtual_interface(const char *if_name)
{
    struct ifreq ifr;
    struct vlan_ioctl_args args;
    int sock, fd, ret;

    fd = open("/proc/net/vlan/config", O_RDONLY);
    if (fd < 0)
    { 
        return -1;
    }

    close(fd);

    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0)
    { 
        return -1;
    }

    strncpy(args.device1, if_name, sizeof(args.device1));
    args.cmd = DEL_VLAN_CMD;
    if (ioctl(sock, SIOCSIFVLAN, &args) < 0)
    { 
        ret = -1;
    }
    else
    {
        ret = 0;
    }

    close(sock);

    return ret;
}

int main()
{
	check_and_remove_interface("eth0");
	
	return 0;
}