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tap-vsockd: add a function to open a TAP device

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Signed-off-by: David Scott <dave@recoil.org>
This commit is contained in:
David Scott 2016-05-12 15:38:33 +01:00
parent 17ced40bf4
commit cd441c5f29
2 changed files with 43 additions and 1 deletions
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2
alpine/packages/tap-vsockd/Dockerfile
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@ -1,6 +1,6 @@
FROM alpine:3.3
RUN apk update && apk upgrade && apk add alpine-sdk util-linux-dev
RUN apk update && apk upgrade && apk add alpine-sdk util-linux-dev linux-headers
RUN mkdir -p /tap-vsockd
WORKDIR /tap-vsockd

42
alpine/packages/tap-vsockd/tap-vsockd.c
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@ -6,10 +6,52 @@
#include <string.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include "compat.h"
int verbose_flag = 0;
int alloc_tap(char *dev) {
int fd;
struct ifreq ifr;
const char *clonedev = "/dev/net/tun";
if ((fd = open(clonedev, O_RDWR)) == -1) {
perror("Failed to open /dev/net/tun");
exit(1);
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if (ioctl(fd, TUNSETIFF, (void*) &ifr) < 0) {
perror("TUNSETIFF failed");
exit(1);
}
int persist = 1;
if (ioctl(fd, TUNSETPERSIST, persist) < 0) {
perror("TUNSETPERSIST failed");
exit(1);
}
fprintf(stderr, "successfully created TAP device %s\n", dev);
return fd;
}
#define SVR_BUF_LEN (3 * 4096)
#define MAX_BUF_LEN (2 * 1024 * 1024)