* THE SOFTWARE.
*/
-#include <unistd.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <sys/types.h>
+#include "qemu/osdep.h"
#include <sys/wait.h>
-/*needed for MAP_POPULATE before including qemu-options.h */
-#include <sys/mman.h>
#include <pwd.h>
#include <grp.h>
#include <libgen.h>
/* Needed early for CONFIG_BSD etc. */
-#include "config-host.h"
-#include "sysemu.h"
+#include "sysemu/sysemu.h"
#include "net/slirp.h"
#include "qemu-options.h"
+#include "qemu/error-report.h"
+#include "qemu/log.h"
+#include "qemu/cutils.h"
#ifdef CONFIG_LINUX
#include <sys/prctl.h>
#endif
-#ifdef __FreeBSD__
-#include <sys/sysctl.h>
-#endif
+/*
+ * Must set all three of these at once.
+ * Legal combinations are unset by name by uid
+ */
+static struct passwd *user_pwd; /* NULL non-NULL NULL */
+static uid_t user_uid = (uid_t)-1; /* -1 -1 >=0 */
+static gid_t user_gid = (gid_t)-1; /* -1 -1 >=0 */
-static struct passwd *user_pwd;
static const char *chroot_dir;
static int daemonize;
-static int fds[2];
+static int daemon_pipe;
void os_setup_early_signal_handling(void)
{
running from the build tree this will be "$bindir/../pc-bios". */
#define SHARE_SUFFIX "/share/qemu"
#define BUILD_SUFFIX "/pc-bios"
-char *os_find_datadir(const char *argv0)
+char *os_find_datadir(void)
{
- char *dir;
- char *p = NULL;
+ char *dir, *exec_dir;
char *res;
- char buf[PATH_MAX];
size_t max_len;
-#if defined(__linux__)
- {
- int len;
- len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
- if (len > 0) {
- buf[len] = 0;
- p = buf;
- }
- }
-#elif defined(__FreeBSD__)
- {
- static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
- size_t len = sizeof(buf) - 1;
-
- *buf = '\0';
- if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) &&
- *buf) {
- buf[sizeof(buf) - 1] = '\0';
- p = buf;
- }
- }
-#endif
- /* If we don't have any way of figuring out the actual executable
- location then try argv[0]. */
- if (!p) {
- p = realpath(argv0, buf);
- if (!p) {
- return NULL;
- }
+ exec_dir = qemu_get_exec_dir();
+ if (exec_dir == NULL) {
+ return NULL;
}
- dir = dirname(p);
- dir = dirname(dir);
+ dir = g_path_get_dirname(exec_dir);
max_len = strlen(dir) +
MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1;
}
}
+ g_free(dir);
+ g_free(exec_dir);
return res;
}
#undef SHARE_SUFFIX
char name[16];
if (!s)
return;
- name[sizeof(name) - 1] = 0;
- strncpy(name, s, sizeof(name));
+ pstrcpy(name, sizeof(name), s);
/* Could rewrite argv[0] too, but that's a bit more complicated.
This simple way is enough for `top'. */
if (prctl(PR_SET_NAME, name)) {
- perror("unable to change process name");
+ error_report("unable to change process name: %s", strerror(errno));
exit(1);
}
#else
- fprintf(stderr, "Change of process name not supported by your OS\n");
+ error_report("Change of process name not supported by your OS");
exit(1);
#endif
}
+
+static bool os_parse_runas_uid_gid(const char *optarg)
+{
+ unsigned long lv;
+ const char *ep;
+ uid_t got_uid;
+ gid_t got_gid;
+ int rc;
+
+ rc = qemu_strtoul(optarg, &ep, 0, &lv);
+ got_uid = lv; /* overflow here is ID in C99 */
+ if (rc || *ep != ':' || got_uid != lv || got_uid == (uid_t)-1) {
+ return false;
+ }
+
+ rc = qemu_strtoul(ep + 1, 0, 0, &lv);
+ got_gid = lv; /* overflow here is ID in C99 */
+ if (rc || got_gid != lv || got_gid == (gid_t)-1) {
+ return false;
+ }
+
+ user_pwd = NULL;
+ user_uid = got_uid;
+ user_gid = got_gid;
+ return true;
+}
+
/*
* Parse OS specific command line options.
* return 0 if option handled, -1 otherwise
*/
-void os_parse_cmd_args(int index, const char *optarg)
+int os_parse_cmd_args(int index, const char *optarg)
{
switch (index) {
#ifdef CONFIG_SLIRP
case QEMU_OPTION_smb:
+ error_report("The -smb option is deprecated. "
+ "Please use '-netdev user,smb=...' instead.");
if (net_slirp_smb(optarg) < 0)
exit(1);
break;
#endif
case QEMU_OPTION_runas:
user_pwd = getpwnam(optarg);
- if (!user_pwd) {
- fprintf(stderr, "User \"%s\" doesn't exist\n", optarg);
+ if (user_pwd) {
+ user_uid = -1;
+ user_gid = -1;
+ } else if (!os_parse_runas_uid_gid(optarg)) {
+ error_report("User \"%s\" doesn't exist"
+ " (and is not <uid>:<gid>)",
+ optarg);
exit(1);
}
break;
fips_set_state(true);
break;
#endif
+ default:
+ return -1;
}
- return;
+
+ return 0;
}
static void change_process_uid(void)
{
- if (user_pwd) {
- if (setgid(user_pwd->pw_gid) < 0) {
- fprintf(stderr, "Failed to setgid(%d)\n", user_pwd->pw_gid);
+ assert((user_uid == (uid_t)-1) || user_pwd == NULL);
+ assert((user_uid == (uid_t)-1) ==
+ (user_gid == (gid_t)-1));
+
+ if (user_pwd || user_uid != (uid_t)-1) {
+ gid_t intended_gid = user_pwd ? user_pwd->pw_gid : user_gid;
+ uid_t intended_uid = user_pwd ? user_pwd->pw_uid : user_uid;
+ if (setgid(intended_gid) < 0) {
+ error_report("Failed to setgid(%d)", intended_gid);
exit(1);
}
- if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) {
- fprintf(stderr, "Failed to initgroups(\"%s\", %d)\n",
- user_pwd->pw_name, user_pwd->pw_gid);
- exit(1);
+ if (user_pwd) {
+ if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) {
+ error_report("Failed to initgroups(\"%s\", %d)",
+ user_pwd->pw_name, user_pwd->pw_gid);
+ exit(1);
+ }
+ } else {
+ if (setgroups(1, &user_gid) < 0) {
+ error_report("Failed to setgroups(1, [%d])",
+ user_gid);
+ exit(1);
+ }
}
- if (setuid(user_pwd->pw_uid) < 0) {
- fprintf(stderr, "Failed to setuid(%d)\n", user_pwd->pw_uid);
+ if (setuid(intended_uid) < 0) {
+ error_report("Failed to setuid(%d)", intended_uid);
exit(1);
}
if (setuid(0) != -1) {
- fprintf(stderr, "Dropping privileges failed\n");
+ error_report("Dropping privileges failed");
exit(1);
}
}
{
if (chroot_dir) {
if (chroot(chroot_dir) < 0) {
- fprintf(stderr, "chroot failed\n");
+ error_report("chroot failed");
exit(1);
}
if (chdir("/")) {
- perror("not able to chdir to /");
+ error_report("not able to chdir to /: %s", strerror(errno));
exit(1);
}
}
void os_daemonize(void)
{
if (daemonize) {
- pid_t pid;
+ pid_t pid;
+ int fds[2];
- if (pipe(fds) == -1)
- exit(1);
+ if (pipe(fds) == -1) {
+ exit(1);
+ }
- pid = fork();
- if (pid > 0) {
- uint8_t status;
- ssize_t len;
+ pid = fork();
+ if (pid > 0) {
+ uint8_t status;
+ ssize_t len;
- close(fds[1]);
+ close(fds[1]);
- again:
- len = read(fds[0], &status, 1);
- if (len == -1 && (errno == EINTR))
- goto again;
+ do {
+ len = read(fds[0], &status, 1);
+ } while (len < 0 && errno == EINTR);
- if (len != 1)
- exit(1);
- else if (status == 1) {
- fprintf(stderr, "Could not acquire pidfile: %s\n", strerror(errno));
- exit(1);
- } else
- exit(0);
- } else if (pid < 0)
- exit(1);
+ /* only exit successfully if our child actually wrote
+ * a one-byte zero to our pipe, upon successful init */
+ exit(len == 1 && status == 0 ? 0 : 1);
- close(fds[0]);
- qemu_set_cloexec(fds[1]);
+ } else if (pid < 0) {
+ exit(1);
+ }
- setsid();
+ close(fds[0]);
+ daemon_pipe = fds[1];
+ qemu_set_cloexec(daemon_pipe);
- pid = fork();
- if (pid > 0)
- exit(0);
- else if (pid < 0)
- exit(1);
+ setsid();
- umask(027);
+ pid = fork();
+ if (pid > 0) {
+ exit(0);
+ } else if (pid < 0) {
+ exit(1);
+ }
+ umask(027);
signal(SIGTSTP, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
int fd = 0;
if (daemonize) {
- uint8_t status = 0;
- ssize_t len;
-
- again1:
- len = write(fds[1], &status, 1);
- if (len == -1 && (errno == EINTR))
- goto again1;
-
- if (len != 1)
- exit(1);
-
if (chdir("/")) {
- perror("not able to chdir to /");
+ error_report("not able to chdir to /: %s", strerror(errno));
+ exit(1);
+ }
+ TFR(fd = qemu_open("/dev/null", O_RDWR));
+ if (fd == -1) {
exit(1);
}
- TFR(fd = qemu_open("/dev/null", O_RDWR));
- if (fd == -1)
- exit(1);
}
change_root();
change_process_uid();
if (daemonize) {
+ uint8_t status = 0;
+ ssize_t len;
+
dup2(fd, 0);
dup2(fd, 1);
- dup2(fd, 2);
+ /* In case -D is given do not redirect stderr to /dev/null */
+ if (!qemu_logfile) {
+ dup2(fd, 2);
+ }
close(fd);
- }
-}
-void os_pidfile_error(void)
-{
- if (daemonize) {
- uint8_t status = 1;
- if (write(fds[1], &status, 1) != 1) {
- perror("daemonize. Writing to pipe\n");
+ do {
+ len = write(daemon_pipe, &status, 1);
+ } while (len < 0 && errno == EINTR);
+ if (len != 1) {
+ exit(1);
}
- } else
- fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));
+ }
}
void os_set_line_buffering(void)
/* keep pidfile open & locked forever */
return 0;
}
+
+bool is_daemonized(void)
+{
+ return daemonize;
+}
+
+int os_mlock(void)
+{
+ int ret = 0;
+
+ ret = mlockall(MCL_CURRENT | MCL_FUTURE);
+ if (ret < 0) {
+ error_report("mlockall: %s", strerror(errno));
+ }
+
+ return ret;
+}
projects / qemu.git / blobdiff