Attachment 216689 Details for Bug 248172 – test program to reproduce behaviour

test program to reproduce behaviour

tester.c (text/plain), 2.44 KB, created by Gert Doering on 2020-07-23 07:29:40 UTC

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Creator: Gert Doering

Created: 2020-07-23 07:29:40 UTC

Size: 2.44 KB

patch

obsolete

>/* test program for 
> *   https://community.openvpn.net/openvpn/ticket/1226
> *   https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248172
> *
> * run as: "./tester tun0" or "tap3" etc.
> * it will open the named tun/tap device, "ifconfig" an inet6 address,
> * and then monitor the output of "ifconfig $dev" for the next 10 seconds
> * on whether IFDISABLED is set (which should not happen)
> */
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <unistd.h>
>#include <fcntl.h>
>#include <errno.h>
>#include <sys/time.h>
>
>void run_it(char *cmd)
>{
>    printf("run cmd: '%s'\n", cmd);
>    if(system(cmd)<0)
>	{ fprintf(stderr, "running system() failed: %s, exit\n", strerror(errno)); exit(10); }
>}
>
>int main(int argc, char ** argv)
>{
>
>    if (argc != 2)
>	{ fprintf(stderr, "%s: need one argument, tun/tap device name ('tun0')\n", argv[0]); exit(1); }
>
>    char *ifname = argv[1];
>    char devname[200];
>    snprintf(devname,sizeof(devname)-1,"/dev/%s",ifname);
>
>    int tunfd = open(devname, O_RDWR);
>    if (tunfd<0)
>	{ fprintf(stderr, "cannot open %s: %s\n", devname, strerror(errno)); exit(2); }
>    printf( "%s open ok, fd=%d\n", devname, tunfd );
>    
>    /* nonblocking mode, close on exec */
>    if (fcntl(tunfd, F_SETFL, O_NONBLOCK) < 0 ||
>        fcntl(tunfd, F_SETFD, FD_CLOEXEC) < 0 )
>	{ fprintf(stderr, "cannot set tunfd to O_NONBLOCK & FD_CLOEXEC: %s\n", strerror(errno)); exit(3); }
>
>    /* ifconfig an inet6 address */
>    char cmdbuf[1000];
>    snprintf(cmdbuf, sizeof(cmdbuf), "ifconfig %s inet6 fd00:abcd:204:4::1001/64 mtu 1500 up", ifname);
>    run_it(cmdbuf);
>
>    /* monitor "ifconfig $dev" output for IFDISABLED
>     */
>
>    time_t start = time(NULL);
>
>    while( time(NULL) < start+10 )
>    {
>	snprintf(cmdbuf, sizeof(cmdbuf), "ifconfig %s", ifname);
>	FILE * pfp = popen(cmdbuf, "r");
>	if (!pfp)
>	    { fprintf(stderr, "cannot popen('%s'): %s\n", cmdbuf, strerror(errno)); exit(3); }
>	
>	char pipebuf[2000];
>	int r = fread(pipebuf, 1, sizeof(pipebuf)-1, pfp);
>	fclose(pfp);
>
>        if (r<0)
>	    { fprintf(stderr, "error reading from pipe: %s\n", strerror(errno)); exit(3); }
>        pipebuf[r] = 0;
>
>	printf( "read %d bytes, time since start=%ds\n%s", r, (int)(time(NULL)-start), pipebuf);
>
>        if (strstr(pipebuf, "IFDISABLED"))
>	    { printf( "    *** FOUND ***\n" ); }
>	sleep(1);
>    }
>
>    /* clean up: close fd, destroy device */
>    close(tunfd);
>
>    snprintf(cmdbuf, sizeof(cmdbuf), "ifconfig %s destroy", ifname);
>    run_it(cmdbuf);
>    
>    exit(0);
>}

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