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// SPDX-License-Identifier: AGPL-3.0-or-later
/* PASST - Plug A Simple Socket Transport
*
* qrap.c - qemu wrapper connecting UNIX domain socket to socket file descriptor
*
* Copyright (c) 2020-2021 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*
* TODO: Implement this functionality directly in qemu: we have TCP and UDP
* socket back-ends already.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <linux/if_ether.h>
#include <linux/ipv6.h>
#include <linux/limits.h>
#include <limits.h>
#include <net/if.h>
#include "passt.h"
#define STRINGIFY(x) #x
#define STR(x) STRINGIFY(x)
static char *qemu_names[] = {
"kvm",
"qemu-kvm",
#ifdef ARCH
"qemu-system-" ARCH,
#endif
"/usr/libexec/qemu-kvm",
NULL,
};
static const struct drop_arg {
char *name;
char *val;
} drop_args[] = {
{ "-netdev", NULL },
{ "-net", NULL },
{ "-device", "virtio-net-pci," },
{ "-device", "virtio-net-ccw," },
{ "-device", "e1000," },
{ "-device", "rtl8139," },
{ 0 },
};
static const struct pci_dev {
char *mach;
char *name;
char *template;
char *template_post;
int first;
int last;
} pci_devs[] = {
{ "pc-q35", "virtio-net-pci",
"bus=pci.", ",addr=0x0", 3, 16 },
{ "pc-", "virtio-net-pci",
"bus=pci.0,addr=0x", "", 2, /* 1: ISA bridge */ 16 },
{ "s390-ccw", "virtio-net-ccw",
"devno=fe.0.", "", 1, 16 },
{ 0 },
};
#define DEFAULT_FD 5
/**
* usage() - Print usage and exit
* @name: Executable name
*/
void usage(const char *name)
{
fprintf(stderr, "Usage: %s [FDNUM QEMU_CMD] ...\n", name);
fprintf(stderr, "\n");
fprintf(stderr, "If first and second arguments aren't a socket number\n"
"and a path, %s will try to locate a qemu binary\n"
"and directly patch the command line\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)
{
char *qemu_argv[ARG_MAX], dev_str[ARG_MAX];
int i, s, qemu_argc = 0, addr_map = 0, has_dev = 0;
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
.sun_path = UNIX_SOCK_PATH,
};
const struct pci_dev *dev = NULL;
long fd;
if (argc >= 3) {
fd = strtol(argv[1], NULL, 0);
if (fd >= 3 && fd < INT_MAX && !errno) {
char env_path[ARG_MAX], *p, command[ARG_MAX];
strncpy(env_path, getenv("PATH"), ARG_MAX);
p = strtok(env_path, ":");
while (p) {
snprintf(command, ARG_MAX, "%s/%s", p, argv[2]);
if (!access(command, X_OK))
goto valid_args;
p = strtok(NULL, ":");
}
}
}
fd = DEFAULT_FD;
for (i = 1; i < argc - 1; i++) {
if (strcmp(argv[i], "-machine"))
continue;
for (dev = pci_devs; dev->mach; dev++) {
if (strstr(argv[i + 1], dev->mach) == argv[i + 1])
break;
}
}
if (!dev || !dev->mach)
dev = pci_devs;
for (qemu_argc = 1, i = 1; i < argc; i++) {
const struct drop_arg *a;
for (a = drop_args; a->name; a++) {
if (!strcmp(argv[i], a->name)) {
if (!a->val)
break;
if (i + 1 < argc &&
strstr(argv[i + 1], a->val) == argv[i + 1])
break;
}
}
if (a->name) {
i++;
continue;
}
if (!strcmp(argv[i], "-device") && i + 1 < argc) {
char *p;
long n;
has_dev = 1;
if ((p = strstr(argv[i + 1], dev->template))) {
n = strtol(p + strlen(dev->template), NULL, 16);
if (!errno)
addr_map |= (1 << n);
}
}
qemu_argv[qemu_argc++] = argv[i];
}
for (i = dev->first; i < dev->last; i++) {
if (!(addr_map & (1 << i)))
break;
}
if (i == dev->last) {
fprintf(stderr, "Couldn't find free address for device\n");
usage(argv[0]);
}
if (has_dev) {
qemu_argv[qemu_argc++] = "-device";
snprintf(dev_str, ARG_MAX, "%s,%s%x%s,netdev=hostnet0",
dev->name, dev->template, i, dev->template_post);
qemu_argv[qemu_argc++] = dev_str;
}
qemu_argv[qemu_argc++] = "-netdev";
qemu_argv[qemu_argc++] = "socket,fd=" STR(DEFAULT_FD) ",id=hostnet0";
qemu_argv[qemu_argc] = NULL;
valid_args:
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);
if (qemu_argc) {
char **name;
for (name = qemu_names; *name; name++) {
qemu_argv[0] = *name;
execvp(*name, qemu_argv);
if (errno != ENOENT) {
perror("execvp");
usage(argv[0]);
}
}
if (errno == ENOENT)
fprintf(stderr, "Couldn't find qemu command\n");
} else {
execvp(argv[2], argv + 2);
}
perror("execvp");
return EXIT_FAILURE;
}
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