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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright (c) 2018, Joyent, Inc.
*/
/*
* This small 'zhyve' stub is init for the zone: we therefore need to pick up
* our command-line arguments placed in ZHYVE_CMD_FILE by the boot stub, do a
* little administration, and exec the real bhyve binary.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <libnvpair.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/corectl.h>
#define ZHYVE_CMD_FILE "/var/run/bhyve/zhyve.cmd"
/*
* Do a read of the specified size or return an error. Returns 0 on success
* and -1 on error. Sets errno to EINVAL if EOF is encountered. For other
* errors, see read(2).
*/
static int
full_read(int fd, char *buf, size_t len)
{
ssize_t nread = 0;
size_t totread = 0;
while (totread < len) {
nread = read(fd, buf + totread, len - totread);
if (nread == 0) {
errno = EINVAL;
return (-1);
}
if (nread < 0) {
if (errno == EINTR || errno == EAGAIN) {
continue;
}
return (-1);
}
totread += nread;
}
assert(totread == len);
return (0);
}
/*
* Reads the command line options from the packed nvlist in the file referenced
* by path. On success, 0 is returned and the members of *argv reference memory
* allocated from an nvlist. On failure, -1 is returned.
*/
static int
parse_options_file(const char *path, uint_t *argcp, char ***argvp)
{
int fd = -1;
struct stat stbuf;
char *buf = NULL;
nvlist_t *nvl = NULL;
int ret;
if ((fd = open(path, O_RDONLY)) < 0 ||
fstat(fd, &stbuf) != 0 ||
(buf = malloc(stbuf.st_size)) == NULL ||
full_read(fd, buf, stbuf.st_size) != 0 ||
nvlist_unpack(buf, stbuf.st_size, &nvl, 0) != 0 ||
nvlist_lookup_string_array(nvl, "bhyve_args", argvp, argcp) != 0) {
nvlist_free(nvl);
ret = -1;
} else {
ret = 0;
}
free(buf);
(void) close(fd);
(void) printf("Configuration from %s:\n", path);
nvlist_print(stdout, nvl);
return (ret);
}
/*
* Setup to suppress core dumps within the zone.
*/
static void
config_core_dumps()
{
(void) core_set_options(0x0);
}
int
main(int argc, char **argv)
{
char **tmpargs;
uint_t zargc;
char **zargv;
int fd;
config_core_dumps();
fd = open("/dev/null", O_WRONLY);
assert(fd >= 0);
if (fd != STDIN_FILENO) {
(void) dup2(fd, STDIN_FILENO);
(void) close(fd);
}
fd = open("/dev/zfd/1", O_WRONLY);
assert(fd >= 0);
if (fd != STDOUT_FILENO) {
(void) dup2(fd, STDOUT_FILENO);
(void) close(fd);
}
setvbuf(stdout, NULL, _IONBF, 0);
fd = open("/dev/zfd/2", O_WRONLY);
assert(fd >= 0);
if (fd != STDERR_FILENO) {
(void) dup2(fd, STDERR_FILENO);
(void) close(fd);
}
setvbuf(stderr, NULL, _IONBF, 0);
if (parse_options_file(ZHYVE_CMD_FILE, &zargc, &zargv) != 0) {
(void) fprintf(stderr, "%s: failed to parse %s: %s\n",
argv[0], ZHYVE_CMD_FILE, strerror(errno));
return (EXIT_FAILURE);
}
/*
* Annoyingly, we need a NULL at the end.
*/
if ((tmpargs = malloc(sizeof (*zargv) * (zargc + 1))) == NULL) {
perror("malloc failed");
return (EXIT_FAILURE);
}
memcpy(tmpargs, zargv, sizeof (*zargv) * zargc);
tmpargs[zargc] = NULL;
(void) execv("/usr/sbin/bhyve", tmpargs);
perror("execv failed");
return (EXIT_FAILURE);
}
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