Avoid asprintf() which is not available on mingw

[qemu.git] / osdep.c

diff --git a/osdep.c b/osdep.c
index 03817f0f3aaf2752849635b039f0ac1cbd947a48..3b25297a25ba046e1a6f2c2608ca852d59650398 100644 (file)
--- a/osdep.c
+++ b/osdep.c
@@ -24,6 +24,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
@@ -47,6 +48,9 @@ extern int madvise(caddr_t, size_t, int);
 #include "qemu-common.h"
 #include "trace.h"
 #include "qemu_socket.h"
+#include "monitor.h"
+
+static bool fips_enabled = false;
 
 static const char *qemu_version = QEMU_VERSION;
 
@@ -75,6 +79,72 @@ int qemu_madvise(void *addr, size_t len, int advice)
 #endif
 }
 
+#ifndef _WIN32
+/*
+ * Dups an fd and sets the flags
+ */
+static int qemu_dup_flags(int fd, int flags)
+{
+    int ret;
+    int serrno;
+    int dup_flags;
+    int setfl_flags;
+
+#ifdef F_DUPFD_CLOEXEC
+    ret = fcntl(fd, F_DUPFD_CLOEXEC, 0);
+#else
+    ret = dup(fd);
+    if (ret != -1) {
+        qemu_set_cloexec(ret);
+    }
+#endif
+    if (ret == -1) {
+        goto fail;
+    }
+
+    dup_flags = fcntl(ret, F_GETFL);
+    if (dup_flags == -1) {
+        goto fail;
+    }
+
+    if ((flags & O_SYNC) != (dup_flags & O_SYNC)) {
+        errno = EINVAL;
+        goto fail;
+    }
+
+    /* Set/unset flags that we can with fcntl */
+    setfl_flags = O_APPEND | O_ASYNC | O_NONBLOCK;
+#ifdef O_NOATIME
+    setfl_flags |= O_NOATIME;
+#endif
+#ifdef O_DIRECT
+    setfl_flags |= O_DIRECT;
+#endif
+    dup_flags &= ~setfl_flags;
+    dup_flags |= (flags & setfl_flags);
+    if (fcntl(ret, F_SETFL, dup_flags) == -1) {
+        goto fail;
+    }
+
+    /* Truncate the file in the cases that open() would truncate it */
+    if (flags & O_TRUNC ||
+            ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) {
+        if (ftruncate(ret, 0) == -1) {
+            goto fail;
+        }
+    }
+
+    return ret;
+
+fail:
+    serrno = errno;
+    if (ret != -1) {
+        close(ret);
+    }
+    errno = serrno;
+    return -1;
+}
+#endif
 
 /*
  * Opens a file with FD_CLOEXEC set
@@ -84,6 +154,41 @@ int qemu_open(const char *name, int flags, ...)
     int ret;
     int mode = 0;
 
+#ifndef _WIN32
+    const char *fdset_id_str;
+
+    /* Attempt dup of fd from fd set */
+    if (strstart(name, "/dev/fdset/", &fdset_id_str)) {
+        int64_t fdset_id;
+        int fd, dupfd;
+
+        fdset_id = qemu_parse_fdset(fdset_id_str);
+        if (fdset_id == -1) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        fd = monitor_fdset_get_fd(fdset_id, flags);
+        if (fd == -1) {
+            return -1;
+        }
+
+        dupfd = qemu_dup_flags(fd, flags);
+        if (dupfd == -1) {
+            return -1;
+        }
+
+        ret = monitor_fdset_dup_fd_add(fdset_id, dupfd);
+        if (ret == -1) {
+            close(dupfd);
+            errno = EINVAL;
+            return -1;
+        }
+
+        return dupfd;
+    }
+#endif
+
     if (flags & O_CREAT) {
         va_list ap;
 
@@ -104,6 +209,26 @@ int qemu_open(const char *name, int flags, ...)
     return ret;
 }
 
+int qemu_close(int fd)
+{
+    int64_t fdset_id;
+
+    /* Close fd that was dup'd from an fdset */
+    fdset_id = monitor_fdset_dup_fd_find(fd);
+    if (fdset_id != -1) {
+        int ret;
+
+        ret = close(fd);
+        if (ret == 0) {
+            monitor_fdset_dup_fd_remove(fd);
+        }
+
+        return ret;
+    }
+
+    return close(fd);
+}
+
 /*
  * A variant of write(2) which handles partial write.
  *
@@ -253,3 +378,29 @@ const char *qemu_get_version(void)
 {
     return qemu_version;
 }
+
+void fips_set_state(bool requested)
+{
+#ifdef __linux__
+    if (requested) {
+        FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r");
+        if (fds != NULL) {
+            fips_enabled = (fgetc(fds) == '1');
+            fclose(fds);
+        }
+    }
+#else
+    fips_enabled = false;
+#endif /* __linux__ */
+
+#ifdef _FIPS_DEBUG
+    fprintf(stderr, "FIPS mode %s (requested %s)\n",
+           (fips_enabled ? "enabled" : "disabled"),
+           (requested ? "enabled" : "disabled"));
+#endif
+}
+
+bool fips_get_state(void)
+{
+    return fips_enabled;
+}