- char cmd[4096];
- int r, len;
-
- if (g->verbose)
- print_timestamped_message (g, "begin building supermin appliance");
-
- len = strlen (g->tmpdir);
- *kernel = safe_malloc (g, len + 8);
- snprintf (*kernel, len+8, "%s/kernel", g->tmpdir);
- *initrd = safe_malloc (g, len + 8);
- snprintf (*initrd, len+8, "%s/initrd", g->tmpdir);
-
- /* Set a sensible umask in the subprocess, so kernel and initrd
- * output files are world-readable (RHBZ#610880).
- */
- snprintf (cmd, sizeof cmd,
- "umask 0002; "
- "febootstrap-supermin-helper%s "
- "-k '%s/kmod.whitelist' "
- "'%s/supermin.d' "
- host_cpu " "
- "%s %s",
- g->verbose ? " --verbose" : "",
- path,
- path,
- *kernel, *initrd);
- if (g->verbose)
- print_timestamped_message (g, "%s", cmd);
-
- r = system (cmd);
- if (r == -1 || WEXITSTATUS(r) != 0) {
- error (g, _("external command failed: %s"), cmd);
- free (*kernel);
- free (*initrd);
- *kernel = *initrd = NULL;
- return -1;
- }
-
- if (g->verbose)
- print_timestamped_message (g, "finished building supermin appliance");
-
- return 0;
-}
-
-/* Compute Y - X and return the result in milliseconds.
- * Approximately the same as this code:
- * http://www.mpp.mpg.de/~huber/util/timevaldiff.c
- */
-static int64_t
-timeval_diff (const struct timeval *x, const struct timeval *y)
-{
- int64_t msec;
-
- msec = (y->tv_sec - x->tv_sec) * 1000;
- msec += (y->tv_usec - x->tv_usec) / 1000;
- return msec;
-}
-
-static void
-print_timestamped_message (guestfs_h *g, const char *fs, ...)
-{
- va_list args;
- char *msg;
- int err;
- struct timeval tv;
-
- va_start (args, fs);
- err = vasprintf (&msg, fs, args);
- va_end (args);
-
- if (err < 0) return;
-
- gettimeofday (&tv, NULL);
-
- fprintf (stderr, "[%05" PRIi64 "ms] %s\n",
- timeval_diff (&g->launch_t, &tv), msg);
-
- free (msg);
-}
-
-static int read_all (guestfs_h *g, FILE *fp, char **ret);
-
-/* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
- * 'qemu -version' so we know what options this qemu supports and
- * the version.
- */
-static int
-test_qemu (guestfs_h *g)
-{
- char cmd[1024];
- FILE *fp;
-
- snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -help", g->qemu);
-
- fp = popen (cmd, "r");
- /* qemu -help should always work (qemu -version OTOH wasn't
- * supported by qemu 0.9). If this command doesn't work then it
- * probably indicates that the qemu binary is missing.
- */
- if (!fp) {
- /* XXX This error is never printed, even if the qemu binary
- * doesn't exist. Why?
- */
- error:
- perrorf (g, _("%s: command failed: If qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU environment variable."), cmd);
- return -1;
- }
-
- if (read_all (g, fp, &g->qemu_help) == -1)
- goto error;
-
- if (pclose (fp) == -1)
- goto error;
-
- snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -version 2>/dev/null",
- g->qemu);
-
- fp = popen (cmd, "r");
- if (fp) {
- /* Intentionally ignore errors. */
- read_all (g, fp, &g->qemu_version);
- pclose (fp);
- }
-
- return 0;
-}
-
-static int
-read_all (guestfs_h *g, FILE *fp, char **ret)
-{
- int r, n = 0;
- char *p;
-
- again:
- if (feof (fp)) {
- *ret = safe_realloc (g, *ret, n + 1);
- (*ret)[n] = '\0';
- return n;
- }
-
- *ret = safe_realloc (g, *ret, n + BUFSIZ);
- p = &(*ret)[n];
- r = fread (p, 1, BUFSIZ, fp);
- if (ferror (fp)) {
- perrorf (g, "read");
- return -1;
- }
- n += r;
- goto again;
-}
-
-/* Test if option is supported by qemu command line (just by grepping
- * the help text).
- *
- * The first time this is used, it has to run the external qemu
- * binary. If that fails, it returns -1.
- *
- * To just do the first-time run of the qemu binary, call this with
- * option == NULL, in which case it will return -1 if there was an
- * error doing that.
- */
-static int
-qemu_supports (guestfs_h *g, const char *option)
-{
- if (!g->qemu_help) {
- if (test_qemu (g) == -1)
- return -1;
- }
-
- if (option == NULL)
- return 1;
-
- return strstr (g->qemu_help, option) != NULL;
-}
-
-/* Check if a file can be opened. */
-static int
-is_openable (guestfs_h *g, const char *path, int flags)
-{
- int fd = open (path, flags);
- if (fd == -1) {
- if (g->verbose)
- perror (path);
- return 0;
- }
- close (fd);
- return 1;
-}
-
-/* Check the peer effective UID for a TCP socket. Ideally we'd like
- * SO_PEERCRED for a loopback TCP socket. This isn't possible on
- * Linux (but it is on Solaris!) so we read /proc/net/tcp instead.
- */
-static int
-check_peer_euid (guestfs_h *g, int sock, uid_t *rtn)
-{
-#if CAN_CHECK_PEER_EUID
- struct sockaddr_in peer;
- socklen_t addrlen = sizeof peer;
-
- if (getpeername (sock, (struct sockaddr *) &peer, &addrlen) == -1) {
- perrorf (g, "getpeername");
- return -1;
- }
-
- if (peer.sin_family != AF_INET ||
- ntohl (peer.sin_addr.s_addr) != INADDR_LOOPBACK) {
- error (g, "check_peer_euid: unexpected connection from non-IPv4, non-loopback peer (family = %d, addr = %s)",
- peer.sin_family, inet_ntoa (peer.sin_addr));
- return -1;
- }
-
- struct sockaddr_in our;
- addrlen = sizeof our;
- if (getsockname (sock, (struct sockaddr *) &our, &addrlen) == -1) {
- perrorf (g, "getsockname");
- return -1;
- }
-
- FILE *fp = fopen ("/proc/net/tcp", "r");
- if (fp == NULL) {
- perrorf (g, "/proc/net/tcp");
- return -1;
- }
-
- char line[256];
- if (fgets (line, sizeof line, fp) == NULL) { /* Drop first line. */
- error (g, "unexpected end of file in /proc/net/tcp");
- fclose (fp);
- return -1;
- }
-
- while (fgets (line, sizeof line, fp) != NULL) {
- unsigned line_our_addr, line_our_port, line_peer_addr, line_peer_port;
- int dummy0, dummy1, dummy2, dummy3, dummy4, dummy5, dummy6;
- int line_uid;
-
- if (sscanf (line, "%d:%08X:%04X %08X:%04X %02X %08X:%08X %02X:%08X %08X %d",
- &dummy0,
- &line_our_addr, &line_our_port,
- &line_peer_addr, &line_peer_port,
- &dummy1, &dummy2, &dummy3, &dummy4, &dummy5, &dummy6,
- &line_uid) == 12) {
- /* Note about /proc/net/tcp: local_address and rem_address are
- * always in network byte order. However the port part is
- * always in host byte order.
- *
- * The sockname and peername that we got above are in network
- * byte order. So we have to byte swap the port but not the
- * address part.
- */
- if (line_our_addr == our.sin_addr.s_addr &&
- line_our_port == ntohs (our.sin_port) &&
- line_peer_addr == peer.sin_addr.s_addr &&
- line_peer_port == ntohs (peer.sin_port)) {
- *rtn = line_uid;
- fclose (fp);
- return 0;
- }
- }
- }
-
- error (g, "check_peer_euid: no matching TCP connection found in /proc/net/tcp");
- fclose (fp);
- return -1;
-#else /* !CAN_CHECK_PEER_EUID */
- /* This function exists but should never be called in this
- * configuration.
- */
- abort ();
-#endif /* !CAN_CHECK_PEER_EUID */
-}
-
-/* You had to call this function after launch in versions <= 1.0.70,
- * but it is now a no-op.
- */
-int
-guestfs__wait_ready (guestfs_h *g)
-{
- if (g->state != READY) {
- error (g, _("qemu has not been launched yet"));
- return -1;
- }
-
- return 0;
-}
-
-int
-guestfs__kill_subprocess (guestfs_h *g)
-{
- if (g->state == CONFIG) {
- error (g, _("no subprocess to kill"));
- return -1;
- }
-
- if (g->verbose)
- fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
-
- if (g->pid > 0) kill (g->pid, SIGTERM);
- if (g->recoverypid > 0) kill (g->recoverypid, 9);
-
- return 0;
-}
-
-/* Access current state. */
-int
-guestfs__is_config (guestfs_h *g)
-{
- return g->state == CONFIG;
-}
-
-int
-guestfs__is_launching (guestfs_h *g)
-{
- return g->state == LAUNCHING;
-}
-
-int
-guestfs__is_ready (guestfs_h *g)
-{
- return g->state == READY;
-}
-
-int
-guestfs__is_busy (guestfs_h *g)
-{
- return g->state == BUSY;
-}
-
-int
-guestfs__get_state (guestfs_h *g)
-{
- return g->state;
-}
-
-void
-guestfs_set_log_message_callback (guestfs_h *g,
- guestfs_log_message_cb cb, void *opaque)
-{
- g->log_message_cb = cb;
- g->log_message_cb_data = opaque;
-}
-
-void
-guestfs_set_subprocess_quit_callback (guestfs_h *g,
- guestfs_subprocess_quit_cb cb, void *opaque)
-{
- g->subprocess_quit_cb = cb;
- g->subprocess_quit_cb_data = opaque;
-}
-
-void
-guestfs_set_launch_done_callback (guestfs_h *g,
- guestfs_launch_done_cb cb, void *opaque)
-{
- g->launch_done_cb = cb;
- g->launch_done_cb_data = opaque;
-}
-
-void
-guestfs_set_close_callback (guestfs_h *g,
- guestfs_close_cb cb, void *opaque)
-{
- g->close_cb = cb;
- g->close_cb_data = opaque;
-}
-
-/*----------------------------------------------------------------------*/
-
-/* This is the code used to send and receive RPC messages and (for
- * certain types of message) to perform file transfers. This code is
- * driven from the generated actions (src/guestfs-actions.c). There
- * are five different cases to consider:
- *
- * (1) A non-daemon function. There is no RPC involved at all, it's
- * all handled inside the library.
- *
- * (2) A simple RPC (eg. "mount"). We write the request, then read
- * the reply. The sequence of calls is:
- *
- * guestfs___set_busy
- * guestfs___send
- * guestfs___recv
- * guestfs___end_busy
- *
- * (3) An RPC with FileOut parameters (eg. "upload"). We write the
- * request, then write the file(s), then read the reply. The sequence
- * of calls is:
- *
- * guestfs___set_busy
- * guestfs___send
- * guestfs___send_file (possibly multiple times)
- * guestfs___recv
- * guestfs___end_busy
- *
- * (4) An RPC with FileIn parameters (eg. "download"). We write the
- * request, then read the reply, then read the file(s). The sequence
- * of calls is:
- *
- * guestfs___set_busy
- * guestfs___send
- * guestfs___recv
- * guestfs___recv_file (possibly multiple times)
- * guestfs___end_busy
- *
- * (5) Both FileOut and FileIn parameters. There are no calls like
- * this in the current API, but they would be implemented as a
- * combination of cases (3) and (4).
- *
- * During all writes and reads, we also select(2) on qemu stdout
- * looking for messages (guestfsd stderr and guest kernel dmesg), and
- * anything received is passed up through the log_message_cb. This is
- * also the reason why all the sockets are non-blocking. We also have
- * to check for EOF (qemu died). All of this is handled by the
- * functions send_to_daemon and recv_from_daemon.
- */
-
-int
-guestfs___set_busy (guestfs_h *g)
-{
- if (g->state != READY) {
- error (g, _("guestfs_set_busy: called when in state %d != READY"),
- g->state);
- return -1;
- }
- g->state = BUSY;
- return 0;
-}
-
-int
-guestfs___end_busy (guestfs_h *g)
-{
- switch (g->state)
- {
- case BUSY:
- g->state = READY;
- break;
- case CONFIG:
- case READY:
- break;
-
- case LAUNCHING:
- case NO_HANDLE:
- default:
- error (g, _("guestfs_end_busy: called when in state %d"), g->state);
- return -1;
- }
- return 0;
-}
-
-/* This is called if we detect EOF, ie. qemu died. */
-static void
-child_cleanup (guestfs_h *g)
-{
- if (g->verbose)
- fprintf (stderr, "child_cleanup: %p: child process died\n", g);
-
- /*if (g->pid > 0) kill (g->pid, SIGTERM);*/
- if (g->recoverypid > 0) kill (g->recoverypid, 9);
- waitpid (g->pid, NULL, 0);
- if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
- close (g->fd[0]);
- close (g->fd[1]);
- close (g->sock);
- g->fd[0] = -1;
- g->fd[1] = -1;
- g->sock = -1;
- g->pid = 0;
- g->recoverypid = 0;
- memset (&g->launch_t, 0, sizeof g->launch_t);
- g->state = CONFIG;
- if (g->subprocess_quit_cb)
- g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
-}
-
-static int
-read_log_message_or_eof (guestfs_h *g, int fd, int error_if_eof)
-{
- char buf[BUFSIZ];
- int n;
-
-#if 0
- if (g->verbose)
- fprintf (stderr,
- "read_log_message_or_eof: %p g->state = %d, fd = %d\n",
- g, g->state, fd);
-#endif
-
- /* QEMU's console emulates a 16550A serial port. The real 16550A
- * device has a small FIFO buffer (16 bytes) which means here we see
- * lots of small reads of 1-16 bytes in length, usually single
- * bytes.
- */
- n = read (fd, buf, sizeof buf);
- if (n == 0) {
- /* Hopefully this indicates the qemu child process has died. */
- child_cleanup (g);
-
- if (error_if_eof) {
- /* We weren't expecting eof here (called from launch) so place
- * something in the error buffer. RHBZ#588851.
- */
- error (g, "child process died unexpectedly");
- }
- return -1;
- }
-
- if (n == -1) {
- if (errno == EINTR || errno == EAGAIN)
- return 0;
-
- perrorf (g, "read");
- return -1;
- }
-
- /* In verbose mode, copy all log messages to stderr. */
- if (g->verbose)
- ignore_value (write (STDERR_FILENO, buf, n));
-
- /* It's an actual log message, send it upwards if anyone is listening. */
- if (g->log_message_cb)
- g->log_message_cb (g, g->log_message_cb_data, buf, n);
-
- return 0;
-}
-
-static int
-check_for_daemon_cancellation_or_eof (guestfs_h *g, int fd)
-{
- char buf[4];
- int n;
- uint32_t flag;
- XDR xdr;
-
- if (g->verbose)
- fprintf (stderr,
- "check_for_daemon_cancellation_or_eof: %p g->state = %d, fd = %d\n",
- g, g->state, fd);
-
- n = read (fd, buf, 4);
- if (n == 0) {
- /* Hopefully this indicates the qemu child process has died. */
- child_cleanup (g);
- return -1;
- }
-
- if (n == -1) {
- if (errno == EINTR || errno == EAGAIN)
- return 0;
-
- perrorf (g, "read");
- return -1;
- }
-
- xdrmem_create (&xdr, buf, 4, XDR_DECODE);
- xdr_uint32_t (&xdr, &flag);
- xdr_destroy (&xdr);
-
- if (flag != GUESTFS_CANCEL_FLAG) {
- error (g, _("check_for_daemon_cancellation_or_eof: read 0x%x from daemon, expected 0x%x\n"),
- flag, GUESTFS_CANCEL_FLAG);
- return -1;
- }
-
- return -2;
-}
-
-/* This writes the whole N bytes of BUF to the daemon socket.
- *
- * If the whole write is successful, it returns 0.
- * If there was an error, it returns -1.
- * If the daemon sent a cancellation message, it returns -2.
- *
- * It also checks qemu stdout for log messages and passes those up
- * through log_message_cb.
- *
- * It also checks for EOF (qemu died) and passes that up through the
- * child_cleanup function above.
- */
-static int
-send_to_daemon (guestfs_h *g, const void *v_buf, size_t n)
-{
- const char *buf = v_buf;
- fd_set rset, rset2;
- fd_set wset, wset2;
-
- if (g->verbose)
- fprintf (stderr,
- "send_to_daemon: %p g->state = %d, n = %zu\n", g, g->state, n);
-
- FD_ZERO (&rset);
- FD_ZERO (&wset);
-
- FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
- FD_SET (g->sock, &rset); /* Read socket for cancellation & EOF. */
- FD_SET (g->sock, &wset); /* Write to socket to send the data. */
-
- int max_fd = MAX (g->sock, g->fd[1]);
-
- while (n > 0) {
- rset2 = rset;
- wset2 = wset;
- int r = select (max_fd+1, &rset2, &wset2, NULL, NULL);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "select");
- return -1;
- }
-
- if (FD_ISSET (g->fd[1], &rset2)) {
- if (read_log_message_or_eof (g, g->fd[1], 0) == -1)
- return -1;
- }
- if (FD_ISSET (g->sock, &rset2)) {
- r = check_for_daemon_cancellation_or_eof (g, g->sock);
- if (r < 0)
- return r;
- }
- if (FD_ISSET (g->sock, &wset2)) {
- r = write (g->sock, buf, n);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "write");
- if (errno == EPIPE) /* Disconnected from guest (RHBZ#508713). */
- child_cleanup (g);
- return -1;
- }
- buf += r;
- n -= r;
- }
- }
-
- return 0;
-}
-
-/* This reads a single message, file chunk, launch flag or
- * cancellation flag from the daemon. If something was read, it
- * returns 0, otherwise -1.
- *
- * Both size_rtn and buf_rtn must be passed by the caller as non-NULL.
- *
- * *size_rtn returns the size of the returned message or it may be
- * GUESTFS_LAUNCH_FLAG or GUESTFS_CANCEL_FLAG.
- *
- * *buf_rtn is returned containing the message (if any) or will be set
- * to NULL. *buf_rtn must be freed by the caller.
- *
- * It also checks qemu stdout for log messages and passes those up
- * through log_message_cb.
- *
- * It also checks for EOF (qemu died) and passes that up through the
- * child_cleanup function above.
- */
-static int
-recv_from_daemon (guestfs_h *g, uint32_t *size_rtn, void **buf_rtn)
-{
- fd_set rset, rset2;
-
- if (g->verbose)
- fprintf (stderr,
- "recv_from_daemon: %p g->state = %d, size_rtn = %p, buf_rtn = %p\n",
- g, g->state, size_rtn, buf_rtn);
-
- FD_ZERO (&rset);
-
- FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
- FD_SET (g->sock, &rset); /* Read socket for data & EOF. */
-
- int max_fd = MAX (g->sock, g->fd[1]);
-
- *size_rtn = 0;
- *buf_rtn = NULL;
-
- char lenbuf[4];
- /* nr is the size of the message, but we prime it as -4 because we
- * have to read the message length word first.
- */
- ssize_t nr = -4;
-
- while (nr < (ssize_t) *size_rtn) {
- rset2 = rset;
- int r = select (max_fd+1, &rset2, NULL, NULL, NULL);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "select");
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
-
- if (FD_ISSET (g->fd[1], &rset2)) {
- if (read_log_message_or_eof (g, g->fd[1], 0) == -1) {
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
- }
- if (FD_ISSET (g->sock, &rset2)) {
- if (nr < 0) { /* Have we read the message length word yet? */
- r = read (g->sock, lenbuf+nr+4, -nr);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- int err = errno;
- perrorf (g, "read");
- /* Under some circumstances we see "Connection reset by peer"
- * here when the child dies suddenly. Catch this and call
- * the cleanup function, same as for EOF.
- */
- if (err == ECONNRESET)
- child_cleanup (g);
- return -1;
- }
- if (r == 0) {
- error (g, _("unexpected end of file when reading from daemon"));
- child_cleanup (g);
- return -1;
- }
- nr += r;
-
- if (nr < 0) /* Still not got the whole length word. */
- continue;
-
- XDR xdr;
- xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
- xdr_uint32_t (&xdr, size_rtn);
- xdr_destroy (&xdr);
-
- if (*size_rtn == GUESTFS_LAUNCH_FLAG) {
- if (g->state != LAUNCHING)
- error (g, _("received magic signature from guestfsd, but in state %d"),
- g->state);
- else {
- g->state = READY;
- if (g->launch_done_cb)
- g->launch_done_cb (g, g->launch_done_cb_data);
- }
- return 0;
- }
- else if (*size_rtn == GUESTFS_CANCEL_FLAG)
- return 0;
- /* If this happens, it's pretty bad and we've probably lost
- * synchronization.
- */
- else if (*size_rtn > GUESTFS_MESSAGE_MAX) {
- error (g, _("message length (%u) > maximum possible size (%d)"),
- (unsigned) *size_rtn, GUESTFS_MESSAGE_MAX);
- return -1;
- }
-
- /* Allocate the complete buffer, size now known. */
- *buf_rtn = safe_malloc (g, *size_rtn);
- /*FALLTHROUGH*/
- }
-
- size_t sizetoread = *size_rtn - nr;
- if (sizetoread > BUFSIZ) sizetoread = BUFSIZ;
-
- r = read (g->sock, (char *) (*buf_rtn) + nr, sizetoread);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "read");
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
- if (r == 0) {
- error (g, _("unexpected end of file when reading from daemon"));
- child_cleanup (g);
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
- nr += r;
- }
- }
-
- /* Got the full message, caller can start processing it. */
-#ifdef ENABLE_PACKET_DUMP
- if (g->verbose) {
- ssize_t i, j;
-
- for (i = 0; i < nr; i += 16) {
- printf ("%04zx: ", i);
- for (j = i; j < MIN (i+16, nr); ++j)
- printf ("%02x ", (*(unsigned char **)buf_rtn)[j]);
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|");
- for (j = i; j < MIN (i+16, nr); ++j)
- if (c_isprint ((*(char **)buf_rtn)[j]))
- printf ("%c", (*(char **)buf_rtn)[j]);
- else
- printf (".");
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|\n");
- }
- }
-#endif
-
- return 0;
-}
-
-/* This is very much like recv_from_daemon above, but g->sock is
- * a listening socket and we are accepting a new connection on
- * that socket instead of reading anything. Returns the newly
- * accepted socket.
- */
-static int
-accept_from_daemon (guestfs_h *g)
-{
- fd_set rset, rset2;
-
- if (g->verbose)
- fprintf (stderr,
- "accept_from_daemon: %p g->state = %d\n", g, g->state);
-
- FD_ZERO (&rset);
-
- FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
- FD_SET (g->sock, &rset); /* Read socket for accept. */
-
- int max_fd = MAX (g->sock, g->fd[1]);
- int sock = -1;
-
- while (sock == -1) {
- /* If the qemu process has died, clean up the zombie (RHBZ#579155).
- * By partially polling in the select below we ensure that this
- * function will be called eventually.
- */
- waitpid (g->pid, NULL, WNOHANG);
-
- rset2 = rset;
-
- struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
- int r = select (max_fd+1, &rset2, NULL, NULL, &tv);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "select");
- return -1;
- }
-
- if (FD_ISSET (g->fd[1], &rset2)) {
- if (read_log_message_or_eof (g, g->fd[1], 1) == -1)
- return -1;
- }
- if (FD_ISSET (g->sock, &rset2)) {
- sock = accept (g->sock, NULL, NULL);
- if (sock == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "accept");
- return -1;
- }
- }
- }
-
- return sock;
-}
-
-int
-guestfs___send (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
-{
- struct guestfs_message_header hdr;
- XDR xdr;
- u_int32_t len;
- int serial = g->msg_next_serial++;
- int r;
- char *msg_out;
- size_t msg_out_size;
-
- if (g->state != BUSY) {
- error (g, _("guestfs___send: state %d != BUSY"), g->state);
- return -1;
- }
-
- /* We have to allocate this message buffer on the heap because
- * it is quite large (although will be mostly unused). We
- * can't allocate it on the stack because in some environments
- * we have quite limited stack space available, notably when
- * running in the JVM.
- */
- msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
- xdrmem_create (&xdr, msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
-
- /* Serialize the header. */
- hdr.prog = GUESTFS_PROGRAM;
- hdr.vers = GUESTFS_PROTOCOL_VERSION;
- hdr.proc = proc_nr;
- hdr.direction = GUESTFS_DIRECTION_CALL;
- hdr.serial = serial;
- hdr.status = GUESTFS_STATUS_OK;
-
- if (!xdr_guestfs_message_header (&xdr, &hdr)) {
- error (g, _("xdr_guestfs_message_header failed"));
- goto cleanup1;
- }
-
- /* Serialize the args. If any, because some message types
- * have no parameters.
- */
- if (xdrp) {
- if (!(*xdrp) (&xdr, args)) {
- error (g, _("dispatch failed to marshal args"));
- goto cleanup1;
- }
- }
-
- /* Get the actual length of the message, resize the buffer to match
- * the actual length, and write the length word at the beginning.
- */
- len = xdr_getpos (&xdr);
- xdr_destroy (&xdr);
-
- msg_out = safe_realloc (g, msg_out, len + 4);
- msg_out_size = len + 4;
-
- xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
- xdr_uint32_t (&xdr, &len);
-
- again:
- r = send_to_daemon (g, msg_out, msg_out_size);
- if (r == -2) /* Ignore stray daemon cancellations. */
- goto again;
- if (r == -1)
- goto cleanup1;
- free (msg_out);
-
- return serial;
-
- cleanup1:
- free (msg_out);
- return -1;
-}
-
-static int cancel = 0; /* XXX Implement file cancellation. */
-static int send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t len);
-static int send_file_data (guestfs_h *g, const char *buf, size_t len);
-static int send_file_cancellation (guestfs_h *g);
-static int send_file_complete (guestfs_h *g);
-
-/* Send a file.
- * Returns:
- * 0 OK
- * -1 error
- * -2 daemon cancelled (we must read the error message)
- */
-int
-guestfs___send_file (guestfs_h *g, const char *filename)
-{
- char buf[GUESTFS_MAX_CHUNK_SIZE];
- int fd, r, err;
-
- fd = open (filename, O_RDONLY);
- if (fd == -1) {
- perrorf (g, "open: %s", filename);
- send_file_cancellation (g);
- /* Daemon sees cancellation and won't reply, so caller can
- * just return here.
- */
- return -1;
- }
-
- /* Send file in chunked encoding. */
- while (!cancel) {
- r = read (fd, buf, sizeof buf);
- if (r == -1 && (errno == EINTR || errno == EAGAIN))
- continue;
- if (r <= 0) break;
- err = send_file_data (g, buf, r);
- if (err < 0) {
- if (err == -2) /* daemon sent cancellation */
- send_file_cancellation (g);
- return err;
- }
- }
-
- if (cancel) { /* cancel from either end */
- send_file_cancellation (g);
- return -1;
- }
-
- if (r == -1) {
- perrorf (g, "read: %s", filename);
- send_file_cancellation (g);
- return -1;
- }
-
- /* End of file, but before we send that, we need to close
- * the file and check for errors.
- */
- if (close (fd) == -1) {
- perrorf (g, "close: %s", filename);
- send_file_cancellation (g);
- return -1;
- }
-
- return send_file_complete (g);
-}
-
-/* Send a chunk of file data. */
-static int
-send_file_data (guestfs_h *g, const char *buf, size_t len)
-{
- return send_file_chunk (g, 0, buf, len);
-}
-
-/* Send a cancellation message. */
-static int
-send_file_cancellation (guestfs_h *g)
-{
- return send_file_chunk (g, 1, NULL, 0);
-}
-
-/* Send a file complete chunk. */
-static int
-send_file_complete (guestfs_h *g)
-{
- char buf[1];
- return send_file_chunk (g, 0, buf, 0);
-}
-
-static int
-send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t buflen)
-{
- u_int32_t len;
- int r;
- guestfs_chunk chunk;
- XDR xdr;
- char *msg_out;
- size_t msg_out_size;
-
- if (g->state != BUSY) {
- error (g, _("send_file_chunk: state %d != READY"), g->state);
- return -1;
- }
-
- /* Allocate the chunk buffer. Don't use the stack to avoid
- * excessive stack usage and unnecessary copies.
- */
- msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
- xdrmem_create (&xdr, msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
-
- /* Serialize the chunk. */
- chunk.cancel = cancel;
- chunk.data.data_len = buflen;
- chunk.data.data_val = (char *) buf;
-
- if (!xdr_guestfs_chunk (&xdr, &chunk)) {
- error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
- buf, buflen);
- xdr_destroy (&xdr);
- goto cleanup1;
- }
-
- len = xdr_getpos (&xdr);
- xdr_destroy (&xdr);
-
- /* Reduce the size of the outgoing message buffer to the real length. */
- msg_out = safe_realloc (g, msg_out, len + 4);
- msg_out_size = len + 4;
-
- xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
- xdr_uint32_t (&xdr, &len);
-
- r = send_to_daemon (g, msg_out, msg_out_size);
-
- /* Did the daemon send a cancellation message? */
- if (r == -2) {
- if (g->verbose)
- fprintf (stderr, "got daemon cancellation\n");
- return -2;
- }
-
- if (r == -1)
- goto cleanup1;
-
- free (msg_out);
-
- return 0;
-
- cleanup1:
- free (msg_out);
- return -1;
-}
-
-/* Receive a reply. */
-int
-guestfs___recv (guestfs_h *g, const char *fn,
- guestfs_message_header *hdr,
- guestfs_message_error *err,
- xdrproc_t xdrp, char *ret)
-{
- XDR xdr;
- void *buf;
- uint32_t size;
- int r;
-
- again:
- r = recv_from_daemon (g, &size, &buf);
- if (r == -1)
- return -1;
-
- /* This can happen if a cancellation happens right at the end
- * of us sending a FileIn parameter to the daemon. Discard. The
- * daemon should send us an error message next.
- */
- if (size == GUESTFS_CANCEL_FLAG)
- goto again;
-
- if (size == GUESTFS_LAUNCH_FLAG) {
- error (g, "%s: received unexpected launch flag from daemon when expecting reply", fn);
- return -1;
- }
-
- xdrmem_create (&xdr, buf, size, XDR_DECODE);
-
- if (!xdr_guestfs_message_header (&xdr, hdr)) {
- error (g, "%s: failed to parse reply header", fn);
- xdr_destroy (&xdr);
- free (buf);
- return -1;
- }
- if (hdr->status == GUESTFS_STATUS_ERROR) {
- if (!xdr_guestfs_message_error (&xdr, err)) {
- error (g, "%s: failed to parse reply error", fn);
- xdr_destroy (&xdr);
- free (buf);
- return -1;
- }
- } else {
- if (xdrp && ret && !xdrp (&xdr, ret)) {
- error (g, "%s: failed to parse reply", fn);
- xdr_destroy (&xdr);
- free (buf);
- return -1;
- }
- }
- xdr_destroy (&xdr);
- free (buf);
-
- return 0;
-}
-
-/* Receive a file. */
-
-/* Returns -1 = error, 0 = EOF, > 0 = more data */
-static ssize_t receive_file_data (guestfs_h *g, void **buf);
-
-int
-guestfs___recv_file (guestfs_h *g, const char *filename)
-{
- void *buf;
- int fd, r;
-
- fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
- if (fd == -1) {
- perrorf (g, "open: %s", filename);
- goto cancel;
- }
-
- /* Receive the file in chunked encoding. */
- while ((r = receive_file_data (g, &buf)) > 0) {
- if (xwrite (fd, buf, r) == -1) {
- perrorf (g, "%s: write", filename);
- free (buf);
- goto cancel;
- }
- free (buf);
- }
-
- if (r == -1) {
- error (g, _("%s: error in chunked encoding"), filename);
- return -1;
- }
-
- if (close (fd) == -1) {
- perrorf (g, "close: %s", filename);
- return -1;
- }
-
- return 0;
-
- cancel: ;
- /* Send cancellation message to daemon, then wait until it
- * cancels (just throwing away data).
- */
- XDR xdr;
- char fbuf[4];
- uint32_t flag = GUESTFS_CANCEL_FLAG;
-
- if (g->verbose)
- fprintf (stderr, "%s: waiting for daemon to acknowledge cancellation\n",
- __func__);
-
- xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
- xdr_uint32_t (&xdr, &flag);
- xdr_destroy (&xdr);
-
- if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
- perrorf (g, _("write to daemon socket"));
- return -1;
- }
-
- while (receive_file_data (g, NULL) > 0)
- ; /* just discard it */
-
- return -1;
-}
-
-/* Receive a chunk of file data. */
-/* Returns -1 = error, 0 = EOF, > 0 = more data */
-static ssize_t
-receive_file_data (guestfs_h *g, void **buf_r)
-{
- int r;
- void *buf;
- uint32_t len;
- XDR xdr;
- guestfs_chunk chunk;
-
- r = recv_from_daemon (g, &len, &buf);
- if (r == -1) {
- error (g, _("receive_file_data: parse error in reply callback"));
- return -1;
- }
-
- if (len == GUESTFS_LAUNCH_FLAG || len == GUESTFS_CANCEL_FLAG) {
- error (g, _("receive_file_data: unexpected flag received when reading file chunks"));
- return -1;
- }
-
- memset (&chunk, 0, sizeof chunk);
-
- xdrmem_create (&xdr, buf, len, XDR_DECODE);
- if (!xdr_guestfs_chunk (&xdr, &chunk)) {
- error (g, _("failed to parse file chunk"));
- free (buf);
- return -1;
- }
- xdr_destroy (&xdr);
- /* After decoding, the original buffer is no longer used. */
- free (buf);
-
- if (chunk.cancel) {
- error (g, _("file receive cancelled by daemon"));
- free (chunk.data.data_val);
- return -1;
- }
-
- if (chunk.data.data_len == 0) { /* end of transfer */
- free (chunk.data.data_val);
- return 0;
- }
-
- if (buf_r) *buf_r = chunk.data.data_val;
- else free (chunk.data.data_val); /* else caller frees */