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