/* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <string.h>
#include <unistd.h>
#include <errno.h>
-#include <ctype.h>
#include <sys/param.h> /* defines MIN */
+#include <sys/select.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#endif
+
+#include "c-ctype.h"
+#include "ignore-value.h"
+
#include "daemon.h"
#include "../src/guestfs_protocol.h"
XDR xdr;
char *buf;
char lenbuf[4];
- unsigned len;
+ uint32_t len;
struct guestfs_message_header hdr;
struct timeval start_t, end_t;
int64_t start_us, end_us, elapsed_us;
sock = _sock;
for (;;) {
-#if 0
/* Most common errors are leaked memory and leaked file descriptors,
* so run this between each command:
*/
- if (verbose)
- system ("ls -l /proc/self/fd");
-#endif
+ if (verbose && 0)
+ ignore_value (system ("ls -l /proc/self/fd"));
/* Read the length word. */
- xread (sock, lenbuf, 4);
+ if (xread (sock, lenbuf, 4) == -1)
+ exit (EXIT_FAILURE);
+
xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
- xdr_uint32_t (&xdr, &len);
+ xdr_u_int (&xdr, &len);
xdr_destroy (&xdr);
if (len > GUESTFS_MESSAGE_MAX) {
fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n",
- len);
- exit (1);
+ len);
+ exit (EXIT_FAILURE);
}
buf = malloc (len);
continue;
}
- xread (sock, buf, len);
+ if (xread (sock, buf, len) == -1)
+ exit (EXIT_FAILURE);
-#if 0
+#ifdef ENABLE_PACKET_DUMP
if (verbose) {
- int i, j;
+ size_t i, j;
for (i = 0; i < len; i += 16) {
- printf ("%04x: ", i);
- for (j = i; j < MIN (i+16, len); ++j)
- printf ("%02x ", (unsigned char) buf[j]);
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|");
- for (j = i; j < MIN (i+16, len); ++j)
- if (isprint (buf[j]))
- printf ("%c", buf[j]);
- else
- printf (".");
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|\n");
+ printf ("%04zx: ", i);
+ for (j = i; j < MIN (i+16, len); ++j)
+ printf ("%02x ", (unsigned char) buf[j]);
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|");
+ for (j = i; j < MIN (i+16, len); ++j)
+ if (c_isprint (buf[j]))
+ printf ("%c", buf[j]);
+ else
+ printf (".");
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|\n");
}
}
#endif
xdrmem_create (&xdr, buf, len, XDR_DECODE);
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
fprintf (stderr, "guestfsd: could not decode message header\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
/* Check the version etc. */
goto cont;
}
- /* Now start to process this message. */
proc_nr = hdr.proc;
serial = hdr.serial;
+
+ /* Clear errors before we call the stub functions. This is just
+ * to ensure that we can accurately report errors in cases where
+ * error handling paths don't set errno correctly.
+ */
+ errno = 0;
+#ifdef WIN32
+ SetLastError (0);
+ WSASetLastError (0);
+#endif
+
+ /* Now start to process this message. */
dispatch_incoming_message (&xdr);
/* Note that dispatch_incoming_message will also send a reply. */
end_us = (int64_t) end_t.tv_sec * 1000000 + end_t.tv_usec;
elapsed_us = end_us - start_us;
fprintf (stderr, "proc %d (%s) took %d.%02d seconds\n",
- proc_nr,
- proc_nr >= 0 && proc_nr < GUESTFS_PROC_NR_PROCS
- ? function_names[proc_nr] : "UNKNOWN PROCEDURE",
- (int) (elapsed_us / 1000000),
- (int) ((elapsed_us / 10000) % 100));
+ proc_nr,
+ proc_nr >= 0 && proc_nr < GUESTFS_PROC_NR_PROCS
+ ? function_names[proc_nr] : "UNKNOWN PROCEDURE",
+ (int) (elapsed_us / 1000000),
+ (int) ((elapsed_us / 10000) % 100));
}
cont:
}
}
-static void send_error (const char *msg);
+static void send_error (int errnum, const char *msg);
void
reply_with_error (const char *fs, ...)
vsnprintf (err, sizeof err, fs, args);
va_end (args);
- send_error (err);
+ send_error (0, err);
}
void
-reply_with_perror (const char *fs, ...)
+reply_with_perror_errno (int err, const char *fs, ...)
{
char buf1[GUESTFS_ERROR_LEN];
char buf2[GUESTFS_ERROR_LEN];
va_list args;
- int err = errno;
va_start (args, fs);
vsnprintf (buf1, sizeof buf1, fs, args);
snprintf (buf2, sizeof buf2, "%s: %s", buf1, strerror (err));
- send_error (buf2);
+ send_error (err, buf2);
}
static void
-send_error (const char *msg)
+send_error (int errnum, const char *msg)
{
XDR xdr;
char buf[GUESTFS_ERROR_LEN + 200];
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
fprintf (stderr, "guestfsd: failed to encode error message header\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
+ err.linux_errno = errnum;
err.error_message = (char *) msg;
if (!xdr_guestfs_message_error (&xdr, &err)) {
fprintf (stderr, "guestfsd: failed to encode error message body\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
len = xdr_getpos (&xdr);
xdr_destroy (&xdr);
xdrmem_create (&xdr, lenbuf, 4, XDR_ENCODE);
- xdr_uint32_t (&xdr, &len);
+ xdr_u_int (&xdr, &len);
xdr_destroy (&xdr);
if (xwrite (sock, lenbuf, 4) == -1) {
fprintf (stderr, "xwrite failed\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
if (xwrite (sock, buf, len) == -1) {
fprintf (stderr, "xwrite failed\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
}
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
fprintf (stderr, "guestfsd: failed to encode reply header\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
if (xdrp) {
+ /* This can fail if the reply body is too large, for example
+ * if it exceeds the maximum message size. In that case
+ * we want to return an error message instead. (RHBZ#509597).
+ */
if (!(*xdrp) (&xdr, ret)) {
- fprintf (stderr, "guestfsd: failed to encode reply body\n");
- exit (1);
+ reply_with_error ("guestfsd: failed to encode reply body\n(maybe the reply exceeds the maximum message size in the protocol?)");
+ xdr_destroy (&xdr);
+ return;
}
}
xdr_destroy (&xdr);
xdrmem_create (&xdr, lenbuf, 4, XDR_ENCODE);
- xdr_uint32_t (&xdr, &len);
+ xdr_u_int (&xdr, &len);
xdr_destroy (&xdr);
if (xwrite (sock, lenbuf, 4) == -1) {
fprintf (stderr, "xwrite failed\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
- if (xwrite (sock, buf, len) == len) {
+ if (xwrite (sock, buf, len) == -1) {
fprintf (stderr, "xwrite failed\n");
- exit (1);
+ exit (EXIT_FAILURE);
}
}
uint32_t len;
for (;;) {
+ if (verbose)
+ fprintf (stderr, "receive_file: reading length word\n");
+
/* Read the length word. */
- xread (sock, lenbuf, 4);
+ if (xread (sock, lenbuf, 4) == -1)
+ exit (EXIT_FAILURE);
+
xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
- xdr_uint32_t (&xdr, &len);
+ xdr_u_int (&xdr, &len);
xdr_destroy (&xdr);
if (len == GUESTFS_CANCEL_FLAG)
if (len > GUESTFS_MESSAGE_MAX) {
fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n",
- len);
- exit (1);
+ len);
+ exit (EXIT_FAILURE);
}
buf = malloc (len);
return -1;
}
- xread (sock, buf, len);
+ if (xread (sock, buf, len) == -1)
+ exit (EXIT_FAILURE);
xdrmem_create (&xdr, buf, len, XDR_DECODE);
memset (&chunk, 0, sizeof chunk);
free (buf);
if (verbose)
- printf ("receive_file: got chunk: cancel = %d, len = %d, buf = %p\n",
- chunk.cancel, chunk.data.data_len, chunk.data.data_val);
+ fprintf (stderr, "receive_file: got chunk: cancel = %d, len = %d, buf = %p\n",
+ chunk.cancel, chunk.data.data_len, chunk.data.data_val);
if (chunk.cancel) {
- fprintf (stderr, "receive_file: received cancellation from library\n");
+ if (verbose)
+ fprintf (stderr, "receive_file: received cancellation from library\n");
xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
return -2;
}
if (chunk.data.data_len == 0) {
+ if (verbose)
+ fprintf (stderr, "receive_file: end of file, leaving function\n");
xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
return 0; /* end of file */
}
r = 0;
xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
- if (r == -1) /* write error */
+ if (r == -1) { /* write error */
+ if (verbose)
+ fprintf (stderr, "receive_file: write error\n");
return -1;
+ }
}
}
/* Send a cancellation flag back to the library. */
-void
+int
cancel_receive (void)
{
XDR xdr;
uint32_t flag = GUESTFS_CANCEL_FLAG;
xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
- xdr_uint32_t (&xdr, &flag);
+ xdr_u_int (&xdr, &flag);
xdr_destroy (&xdr);
if (xwrite (sock, fbuf, sizeof fbuf) == -1) {
perror ("write to socket");
- return;
+ return -1;
}
/* Keep receiving chunks and discarding, until library sees cancel. */
- (void) receive_file (NULL, NULL);
+ return receive_file (NULL, NULL);
}
static int check_for_library_cancellation (void);
if (len > GUESTFS_MAX_CHUNK_SIZE) {
fprintf (stderr, "send_file_write: len (%d) > GUESTFS_MAX_CHUNK_SIZE (%d)\n",
- len, GUESTFS_MAX_CHUNK_SIZE);
+ len, GUESTFS_MAX_CHUNK_SIZE);
return -1;
}
/* Read the message from the daemon. */
r = xread (sock, buf, sizeof buf);
- if (r == -1) {
- perror ("read");
+ if (r == -1)
return 0;
- }
xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
- xdr_uint32_t (&xdr, &flag);
+ xdr_u_int (&xdr, &flag);
xdr_destroy (&xdr);
if (flag != GUESTFS_CANCEL_FLAG) {
fprintf (stderr, "check_for_library_cancellation: read 0x%x from library, expected 0x%x\n",
- flag, GUESTFS_CANCEL_FLAG);
+ flag, GUESTFS_CANCEL_FLAG);
return 0;
}
return 1;
}
-void
+int
send_file_end (int cancel)
{
guestfs_chunk chunk;
chunk.cancel = cancel;
chunk.data.data_len = 0;
chunk.data.data_val = NULL;
- send_chunk (&chunk);
+ return send_chunk (&chunk);
}
static int
xdr_destroy (&xdr);
xdrmem_create (&xdr, lenbuf, 4, XDR_ENCODE);
- xdr_uint32_t (&xdr, &len);
+ xdr_u_int (&xdr, &len);
xdr_destroy (&xdr);
- (void) xwrite (sock, lenbuf, 4);
- (void) xwrite (sock, buf, len);
+ int err = (xwrite (sock, lenbuf, 4) == 0
+ && xwrite (sock, buf, len) == 0 ? 0 : -1);
+ if (err) {
+ fprintf (stderr, "send_chunk: write failed\n");
+ exit (EXIT_FAILURE);
+ }
- return 0;
+ return err;
}
git.annexia.org / libguestfs.git / blobdiff