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We can bypass a full-fledged network interface between qemu and merd by connecting the qemu tap file descriptor to a provided UNIX domain socket: this could be implemented in qemu eventually, qrap covers this meanwhile. This also avoids the need for the AF_PACKET socket towards the guest. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
/* MERD - MacVTap Egress and Routing Daemon
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*
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* qrap.c - qemu wrapper connecting UNIX domain socket to tap file descriptor
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*
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* Author: Stefano Brivio <sbrivio@redhat.com>
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* License: GPLv2
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*
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* TODO: Implement this functionality directly in qemu: we have TCP and UDP
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* socket back-ends already.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <limits.h>
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#include "merd.h"
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/**
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* usage() - Print usage and exit
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* @name: Executable name
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*/
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void usage(const char *name)
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{
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fprintf(stderr, "Usage: %s FDNUM QEMU_CMD ...\n", name);
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exit(EXIT_FAILURE);
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}
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/**
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* main() - Entry point and main loop
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* @argc: Argument count
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* @argv: File descriptor number, then qemu with arguments
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*
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* Return: 0 once interrupted, non-zero on failure
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*/
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int main(int argc, char **argv)
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{
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struct sockaddr_un addr = {
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.sun_family = AF_UNIX,
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.sun_path = UNIX_SOCK_PATH,
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};
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long fd;
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int s;
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if (argc < 3)
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usage(argv[0]);
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fd = strtol(argv[1], NULL, 0);
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if (fd < 3 || fd > INT_MAX || errno)
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usage(argv[0]);
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s = socket(AF_UNIX, SOCK_STREAM, 0);
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if (s < 0) {
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perror("socket");
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exit(EXIT_FAILURE);
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}
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if (connect(s, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
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perror("connect");
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exit(EXIT_FAILURE);
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}
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if (dup2(s, (int)fd) < 0) {
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perror("dup");
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exit(EXIT_FAILURE);
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}
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close(s);
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execvp(argv[2], argv + 2);
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perror("execvp");
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return EXIT_FAILURE;
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}
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