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https://github.com/libguestfs/libguestfs.git
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0306c98d31
guestfsd calls many different tools. Keeping track of all of them is error prone. This patch introduces a new helper macro to put the command string into its own ELF section: GUESTFSD_EXT_CMD(C_variable, command_name); This syntax makes it still possible to grep for used command names. The actual usage of the collected list could be like this: objcopy -j .guestfsd_ext_cmds -O binary daemon/guestfsd /dev/stdout | tr '\0' '\n' | sort -u The resulting output will be used to tell mkinitrd which programs to copy into the initrd. Signed-off-by: Olaf Hering <olaf@aepfle.de> RWMJ: - Move str_vgchange at request of author. - Fix snprintf call in daemon/debug.c
154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2010 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include "guestfs_protocol.h"
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#include "daemon.h"
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#include "actions.h"
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GUESTFSD_EXT_CMD(str_base64, base64);
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static int
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write_cb (void *fd_ptr, const void *buf, size_t len)
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{
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int fd = *(int *)fd_ptr;
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return xwrite (fd, buf, len);
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}
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/* Has one FileIn parameter. */
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int
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do_base64_in (const char *file)
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{
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int err, r;
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FILE *fp;
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char *cmd;
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if (asprintf_nowarn (&cmd, "%s -d -i > %R", str_base64, file) == -1) {
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err = errno;
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cancel_receive ();
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errno = err;
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reply_with_perror ("asprintf");
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return -1;
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}
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if (verbose)
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fprintf (stderr, "%s\n", cmd);
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fp = popen (cmd, "w");
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if (fp == NULL) {
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err = errno;
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cancel_receive ();
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errno = err;
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reply_with_perror ("%s", cmd);
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free (cmd);
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return -1;
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}
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free (cmd);
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/* The semantics of fwrite are too undefined, so write to the
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* file descriptor directly instead.
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*/
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int fd = fileno (fp);
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r = receive_file (write_cb, &fd);
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if (r == -1) { /* write error */
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cancel_receive ();
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reply_with_error ("write error on file: %s", file);
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pclose (fp);
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return -1;
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}
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if (r == -2) { /* cancellation from library */
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/* This error is ignored by the library since it initiated the
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* cancel. Nevertheless we must send an error reply here.
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*/
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reply_with_error ("file upload cancelled");
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pclose (fp);
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return -1;
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}
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if (pclose (fp) != 0) {
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reply_with_error ("base64 subcommand failed on file: %s", file);
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return -1;
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}
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return 0;
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}
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/* Has one FileOut parameter. */
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int
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do_base64_out (const char *file)
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{
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int r;
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FILE *fp;
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char *cmd;
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char buf[GUESTFS_MAX_CHUNK_SIZE];
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if (asprintf_nowarn (&cmd, "%s %R", str_base64, file) == -1) {
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reply_with_perror ("asprintf");
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return -1;
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}
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if (verbose)
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fprintf (stderr, "%s\n", cmd);
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fp = popen (cmd, "r");
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if (fp == NULL) {
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reply_with_perror ("%s", cmd);
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free (cmd);
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return -1;
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}
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free (cmd);
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/* Now we must send the reply message, before the file contents. After
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* this there is no opportunity in the protocol to send any error
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* message back. Instead we can only cancel the transfer.
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*/
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reply (NULL, NULL);
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while ((r = fread (buf, 1, sizeof buf, fp)) > 0) {
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if (send_file_write (buf, r) < 0) {
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pclose (fp);
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return -1;
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}
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}
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if (ferror (fp)) {
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perror (file);
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send_file_end (1); /* Cancel. */
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pclose (fp);
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return -1;
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}
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if (pclose (fp) != 0) {
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perror (file);
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send_file_end (1); /* Cancel. */
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return -1;
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}
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if (send_file_end (0)) /* Normal end of file. */
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return -1;
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return 0;
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}
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