2bb26185e3
* src/posix-io.c (_gpgme_io_waitpid): Protect waitpid agains EINTR. (_gpgme_io_dup): Likewise. (_gpgme_io_connect): Likewise. -- GnuPG-bug-id: 1630
745 lines
16 KiB
C
745 lines
16 KiB
C
/* posix-io.c - Posix I/O functions
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Copyright (C) 2000 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2004, 2005, 2007, 2010 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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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 <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <sys/wait.h>
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#ifdef HAVE_SYS_UIO_H
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# include <sys/uio.h>
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#endif
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#include <ctype.h>
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#include <sys/resource.h>
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#include "util.h"
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#include "priv-io.h"
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#include "sema.h"
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#include "ath.h"
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#include "debug.h"
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void
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_gpgme_io_subsystem_init (void)
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{
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struct sigaction act;
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sigaction (SIGPIPE, NULL, &act);
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if (act.sa_handler == SIG_DFL)
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{
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act.sa_handler = SIG_IGN;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction (SIGPIPE, &act, NULL);
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}
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}
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/* Write the printable version of FD to the buffer BUF of length
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BUFLEN. The printable version is the representation on the command
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line that the child process expects. */
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int
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_gpgme_io_fd2str (char *buf, int buflen, int fd)
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{
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return snprintf (buf, buflen, "%d", fd);
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}
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/* The table to hold notification handlers. We use a linear search
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and extend the table as needed. */
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struct notify_table_item_s
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{
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int fd; /* -1 indicates an unused entry. */
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_gpgme_close_notify_handler_t handler;
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void *value;
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};
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typedef struct notify_table_item_s *notify_table_item_t;
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static notify_table_item_t notify_table;
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static size_t notify_table_size;
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DEFINE_STATIC_LOCK (notify_table_lock);
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int
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_gpgme_io_read (int fd, void *buffer, size_t count)
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{
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int nread;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_read", fd,
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"buffer=%p, count=%u", buffer, count);
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do
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{
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nread = _gpgme_ath_read (fd, buffer, count);
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}
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while (nread == -1 && errno == EINTR);
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TRACE_LOGBUF (buffer, nread);
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return TRACE_SYSRES (nread);
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}
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int
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_gpgme_io_write (int fd, const void *buffer, size_t count)
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{
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int nwritten;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_write", fd,
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"buffer=%p, count=%u", buffer, count);
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TRACE_LOGBUF (buffer, count);
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do
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{
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nwritten = _gpgme_ath_write (fd, buffer, count);
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}
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while (nwritten == -1 && errno == EINTR);
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return TRACE_SYSRES (nwritten);
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}
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int
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_gpgme_io_pipe (int filedes[2], int inherit_idx)
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{
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int saved_errno;
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int err;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_pipe", filedes,
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"inherit_idx=%i (GPGME uses it for %s)",
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inherit_idx, inherit_idx ? "reading" : "writing");
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err = pipe (filedes);
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if (err < 0)
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return TRACE_SYSRES (err);
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/* FIXME: Should get the old flags first. */
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err = fcntl (filedes[1 - inherit_idx], F_SETFD, FD_CLOEXEC);
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saved_errno = errno;
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if (err < 0)
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{
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close (filedes[0]);
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close (filedes[1]);
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}
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errno = saved_errno;
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if (err)
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return TRACE_SYSRES (err);
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return TRACE_SUC2 ("read=0x%x, write=0x%x", filedes[0], filedes[1]);
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}
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int
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_gpgme_io_close (int fd)
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{
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int res;
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_gpgme_close_notify_handler_t handler = NULL;
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void *handler_value;
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int idx;
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TRACE_BEG (DEBUG_SYSIO, "_gpgme_io_close", fd);
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if (fd == -1)
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{
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errno = EINVAL;
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return TRACE_SYSRES (-1);
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}
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/* First call the notify handler. */
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LOCK (notify_table_lock);
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for (idx=0; idx < notify_table_size; idx++)
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{
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if (notify_table[idx].fd == fd)
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{
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handler = notify_table[idx].handler;
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handler_value = notify_table[idx].value;
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notify_table[idx].handler = NULL;
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notify_table[idx].value = NULL;
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notify_table[idx].fd = -1; /* Mark slot as free. */
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break;
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}
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}
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UNLOCK (notify_table_lock);
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if (handler)
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{
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TRACE_LOG2 ("invoking close handler %p/%p", handler, handler_value);
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handler (fd, handler_value);
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}
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/* Then do the close. */
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res = close (fd);
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return TRACE_SYSRES (res);
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}
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int
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_gpgme_io_set_close_notify (int fd, _gpgme_close_notify_handler_t handler,
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void *value)
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{
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int res = 0;
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int idx;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_set_close_notify", fd,
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"close_handler=%p/%p", handler, value);
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assert (fd != -1);
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LOCK (notify_table_lock);
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for (idx=0; idx < notify_table_size; idx++)
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if (notify_table[idx].fd == -1)
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break;
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if (idx == notify_table_size)
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{
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/* We need to increase the size of the table. The approach we
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take is straightforward to minimize the risk of bugs. */
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notify_table_item_t newtbl;
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size_t newsize = notify_table_size + 64;
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newtbl = calloc (newsize, sizeof *newtbl);
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if (!newtbl)
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{
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res = -1;
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goto leave;
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}
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for (idx=0; idx < notify_table_size; idx++)
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newtbl[idx] = notify_table[idx];
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for (; idx < newsize; idx++)
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{
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newtbl[idx].fd = -1;
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newtbl[idx].handler = NULL;
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newtbl[idx].value = NULL;
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}
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free (notify_table);
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notify_table = newtbl;
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idx = notify_table_size;
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notify_table_size = newsize;
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}
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notify_table[idx].fd = fd;
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notify_table[idx].handler = handler;
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notify_table[idx].value = value;
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leave:
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UNLOCK (notify_table_lock);
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return TRACE_SYSRES (res);
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}
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int
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_gpgme_io_set_nonblocking (int fd)
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{
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int flags;
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int res;
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TRACE_BEG (DEBUG_SYSIO, "_gpgme_io_set_nonblocking", fd);
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flags = fcntl (fd, F_GETFL, 0);
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if (flags == -1)
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return TRACE_SYSRES (-1);
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flags |= O_NONBLOCK;
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res = fcntl (fd, F_SETFL, flags);
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return TRACE_SYSRES (res);
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}
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static long int
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get_max_fds (void)
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{
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char *source = NULL;
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long int fds = -1;
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int rc;
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#ifdef RLIMIT_NOFILE
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{
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struct rlimit rl;
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rc = getrlimit (RLIMIT_NOFILE, &rl);
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if (rc == 0)
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{
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source = "RLIMIT_NOFILE";
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fds = rl.rlim_max;
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}
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}
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#endif
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#ifdef RLIMIT_OFILE
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if (fds == -1)
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{
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struct rlimit rl;
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rc = getrlimit (RLIMIT_OFILE, &rl);
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if (rc == 0)
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{
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source = "RLIMIT_OFILE";
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fds = rl.rlim_max;
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}
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}
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#endif
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#ifdef _SC_OPEN_MAX
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if (fds == -1)
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{
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long int scres;
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scres = sysconf (_SC_OPEN_MAX);
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if (scres >= 0)
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{
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source = "_SC_OPEN_MAX";
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return scres;
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}
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}
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#endif
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#ifdef OPEN_MAX
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if (fds == -1)
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{
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source = "OPEN_MAX";
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fds = OPEN_MAX;
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}
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#endif
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#if !defined(RLIMIT_NOFILE) && !defined(RLIMIT_OFILE) \
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&& !defined(_SC_OPEN_MAX) && !defined(OPEN_MAX)
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#warning "No known way to get the maximum number of file descriptors."
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#endif
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if (fds == -1)
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{
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source = "arbitrary";
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/* Arbitrary limit. */
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fds = 1024;
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}
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TRACE2 (DEBUG_SYSIO, "gpgme:max_fds", 0, "max fds=%i (%s)", fds, source);
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return fds;
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}
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int
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_gpgme_io_waitpid (int pid, int hang, int *r_status, int *r_signal)
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{
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int status;
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pid_t ret;
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*r_status = 0;
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*r_signal = 0;
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do
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ret = _gpgme_ath_waitpid (pid, &status, hang? 0 : WNOHANG);
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while (ret == (pid_t)(-1) && errno == EINTR);
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if (ret == pid)
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{
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if (WIFSIGNALED (status))
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{
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*r_status = 4; /* Need some value here. */
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*r_signal = WTERMSIG (status);
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}
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else if (WIFEXITED (status))
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*r_status = WEXITSTATUS (status);
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else
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*r_status = 4; /* Oops. */
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return 1;
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}
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return 0;
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}
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/* Returns 0 on success, -1 on error. */
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int
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_gpgme_io_spawn (const char *path, char *const argv[], unsigned int flags,
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struct spawn_fd_item_s *fd_list,
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void (*atfork) (void *opaque, int reserved),
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void *atforkvalue, pid_t *r_pid)
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{
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pid_t pid;
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int i;
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int status;
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int signo;
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TRACE_BEG1 (DEBUG_SYSIO, "_gpgme_io_spawn", path,
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"path=%s", path);
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i = 0;
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while (argv[i])
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{
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TRACE_LOG2 ("argv[%2i] = %s", i, argv[i]);
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i++;
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}
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for (i = 0; fd_list[i].fd != -1; i++)
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if (fd_list[i].dup_to == -1)
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TRACE_LOG2 ("fd[%i] = 0x%x", i, fd_list[i].fd);
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else
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TRACE_LOG3 ("fd[%i] = 0x%x -> 0x%x", i, fd_list[i].fd, fd_list[i].dup_to);
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pid = fork ();
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if (pid == -1)
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return TRACE_SYSRES (-1);
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if (!pid)
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{
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/* Intermediate child to prevent zombie processes. */
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if ((pid = fork ()) == 0)
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{
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int max_fds = get_max_fds ();
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int fd;
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/* Child. */
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int seen_stdin = 0;
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int seen_stdout = 0;
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int seen_stderr = 0;
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if (atfork)
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atfork (atforkvalue, 0);
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/* First close all fds which will not be inherited. */
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for (fd = 0; fd < max_fds; fd++)
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{
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for (i = 0; fd_list[i].fd != -1; i++)
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if (fd_list[i].fd == fd)
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break;
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if (fd_list[i].fd == -1)
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close (fd);
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}
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/* And now dup and close those to be duplicated. */
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for (i = 0; fd_list[i].fd != -1; i++)
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{
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int child_fd;
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int res;
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if (fd_list[i].dup_to != -1)
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child_fd = fd_list[i].dup_to;
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else
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child_fd = fd_list[i].fd;
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if (child_fd == 0)
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seen_stdin = 1;
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else if (child_fd == 1)
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seen_stdout = 1;
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else if (child_fd == 2)
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seen_stderr = 1;
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if (fd_list[i].dup_to == -1)
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continue;
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res = dup2 (fd_list[i].fd, fd_list[i].dup_to);
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if (res < 0)
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{
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#if 0
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/* FIXME: The debug file descriptor is not
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dup'ed anyway, so we can't see this. */
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TRACE_LOG1 ("dup2 failed in child: %s\n",
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strerror (errno));
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#endif
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_exit (8);
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}
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close (fd_list[i].fd);
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}
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if (! seen_stdin || ! seen_stdout || !seen_stderr)
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{
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fd = open ("/dev/null", O_RDWR);
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if (fd == -1)
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{
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/* The debug file descriptor is not dup'ed, so we
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can't do a trace output. */
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_exit (8);
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}
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/* Make sure that the process has connected stdin. */
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if (! seen_stdin && fd != 0)
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{
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if (dup2 (fd, 0) == -1)
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_exit (8);
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}
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if (! seen_stdout && fd != 1)
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{
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if (dup2 (fd, 1) == -1)
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_exit (8);
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}
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if (! seen_stderr && fd != 2)
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{
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if (dup2 (fd, 2) == -1)
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_exit (8);
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}
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if (fd != 0 && fd != 1 && fd != 2)
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close (fd);
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}
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execv (path, (char *const *) argv);
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/* Hmm: in that case we could write a special status code to the
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status-pipe. */
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_exit (8);
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/* End child. */
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}
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if (pid == -1)
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_exit (1);
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else
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_exit (0);
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}
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TRACE_LOG1 ("waiting for child process pid=%i", pid);
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_gpgme_io_waitpid (pid, 1, &status, &signo);
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if (status)
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return TRACE_SYSRES (-1);
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for (i = 0; fd_list[i].fd != -1; i++)
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{
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if (! (flags & IOSPAWN_FLAG_NOCLOSE))
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_gpgme_io_close (fd_list[i].fd);
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/* No handle translation. */
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fd_list[i].peer_name = fd_list[i].fd;
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}
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|
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if (r_pid)
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*r_pid = pid;
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return TRACE_SYSRES (0);
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}
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/* Select on the list of fds. Returns: -1 = error, 0 = timeout or
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nothing to select, > 0 = number of signaled fds. */
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int
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_gpgme_io_select (struct io_select_fd_s *fds, size_t nfds, int nonblock)
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{
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fd_set readfds;
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fd_set writefds;
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unsigned int i;
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int any;
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int max_fd;
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int n;
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int count;
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/* Use a 1s timeout. */
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struct timeval timeout = { 1, 0 };
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void *dbg_help = NULL;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_select", fds,
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"nfds=%u, nonblock=%u", nfds, nonblock);
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FD_ZERO (&readfds);
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FD_ZERO (&writefds);
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max_fd = 0;
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if (nonblock)
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timeout.tv_sec = 0;
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TRACE_SEQ (dbg_help, "select on [ ");
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any = 0;
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for (i = 0; i < nfds; i++)
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{
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if (fds[i].fd == -1)
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continue;
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if (fds[i].for_read)
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{
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assert (!FD_ISSET (fds[i].fd, &readfds));
|
||
FD_SET (fds[i].fd, &readfds);
|
||
if (fds[i].fd > max_fd)
|
||
max_fd = fds[i].fd;
|
||
TRACE_ADD1 (dbg_help, "r0x%x ", fds[i].fd);
|
||
any = 1;
|
||
}
|
||
else if (fds[i].for_write)
|
||
{
|
||
assert (!FD_ISSET (fds[i].fd, &writefds));
|
||
FD_SET (fds[i].fd, &writefds);
|
||
if (fds[i].fd > max_fd)
|
||
max_fd = fds[i].fd;
|
||
TRACE_ADD1 (dbg_help, "w0x%x ", fds[i].fd);
|
||
any = 1;
|
||
}
|
||
fds[i].signaled = 0;
|
||
}
|
||
TRACE_END (dbg_help, "]");
|
||
if (!any)
|
||
return TRACE_SYSRES (0);
|
||
|
||
do
|
||
{
|
||
count = _gpgme_ath_select (max_fd + 1, &readfds, &writefds, NULL,
|
||
&timeout);
|
||
}
|
||
while (count < 0 && errno == EINTR);
|
||
if (count < 0)
|
||
return TRACE_SYSRES (-1);
|
||
|
||
TRACE_SEQ (dbg_help, "select OK [ ");
|
||
if (TRACE_ENABLED (dbg_help))
|
||
{
|
||
for (i = 0; i <= max_fd; i++)
|
||
{
|
||
if (FD_ISSET (i, &readfds))
|
||
TRACE_ADD1 (dbg_help, "r0x%x ", i);
|
||
if (FD_ISSET (i, &writefds))
|
||
TRACE_ADD1 (dbg_help, "w0x%x ", i);
|
||
}
|
||
TRACE_END (dbg_help, "]");
|
||
}
|
||
|
||
/* The variable N is used to optimize it a little bit. */
|
||
for (n = count, i = 0; i < nfds && n; i++)
|
||
{
|
||
if (fds[i].fd == -1)
|
||
;
|
||
else if (fds[i].for_read)
|
||
{
|
||
if (FD_ISSET (fds[i].fd, &readfds))
|
||
{
|
||
fds[i].signaled = 1;
|
||
n--;
|
||
}
|
||
}
|
||
else if (fds[i].for_write)
|
||
{
|
||
if (FD_ISSET (fds[i].fd, &writefds))
|
||
{
|
||
fds[i].signaled = 1;
|
||
n--;
|
||
}
|
||
}
|
||
}
|
||
return TRACE_SYSRES (count);
|
||
}
|
||
|
||
|
||
int
|
||
_gpgme_io_recvmsg (int fd, struct msghdr *msg, int flags)
|
||
{
|
||
int nread;
|
||
int saved_errno;
|
||
struct iovec *iov;
|
||
TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_recvmsg", fd,
|
||
"msg=%p, flags=%i", msg, flags);
|
||
|
||
nread = 0;
|
||
iov = msg->msg_iov;
|
||
while (iov < msg->msg_iov + msg->msg_iovlen)
|
||
{
|
||
nread += iov->iov_len;
|
||
iov++;
|
||
}
|
||
|
||
TRACE_LOG1 ("about to receive %d bytes", nread);
|
||
|
||
do
|
||
{
|
||
nread = _gpgme_ath_recvmsg (fd, msg, flags);
|
||
}
|
||
while (nread == -1 && errno == EINTR);
|
||
saved_errno = errno;
|
||
if (nread > 0)
|
||
{
|
||
int nr = nread;
|
||
|
||
iov = msg->msg_iov;
|
||
while (nr > 0)
|
||
{
|
||
int len = nr > iov->iov_len ? iov->iov_len : nr;
|
||
TRACE_LOGBUF (msg->msg_iov->iov_base, len);
|
||
iov++;
|
||
nr -= len;
|
||
}
|
||
}
|
||
errno = saved_errno;
|
||
return TRACE_SYSRES (nread);
|
||
}
|
||
|
||
|
||
int
|
||
_gpgme_io_sendmsg (int fd, const struct msghdr *msg, int flags)
|
||
{
|
||
int nwritten;
|
||
struct iovec *iov;
|
||
TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_sendmsg", fd,
|
||
"msg=%p, flags=%i", msg, flags);
|
||
|
||
nwritten = 0;
|
||
iov = msg->msg_iov;
|
||
while (iov < msg->msg_iov + msg->msg_iovlen)
|
||
{
|
||
nwritten += iov->iov_len;
|
||
iov++;
|
||
}
|
||
|
||
TRACE_LOG1 ("about to receive %d bytes", nwritten);
|
||
iov = msg->msg_iov;
|
||
while (nwritten > 0)
|
||
{
|
||
int len = nwritten > iov->iov_len ? iov->iov_len : nwritten;
|
||
TRACE_LOGBUF (msg->msg_iov->iov_base, len);
|
||
iov++;
|
||
nwritten -= len;
|
||
}
|
||
|
||
do
|
||
{
|
||
nwritten = _gpgme_ath_sendmsg (fd, msg, flags);
|
||
}
|
||
while (nwritten == -1 && errno == EINTR);
|
||
return TRACE_SYSRES (nwritten);
|
||
}
|
||
|
||
|
||
int
|
||
_gpgme_io_dup (int fd)
|
||
{
|
||
int new_fd;
|
||
|
||
do
|
||
new_fd = dup (fd);
|
||
while (new_fd == -1 && errno == EINTR);
|
||
|
||
TRACE1 (DEBUG_SYSIO, "_gpgme_io_dup", fd, "new fd==%i", new_fd);
|
||
|
||
return new_fd;
|
||
}
|
||
|
||
|
||
int
|
||
_gpgme_io_socket (int domain, int type, int proto)
|
||
{
|
||
int res;
|
||
|
||
TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_socket", domain,
|
||
"type=%i, proto=%i", type, proto);
|
||
|
||
res = socket (domain, type, proto);
|
||
|
||
return TRACE_SYSRES (res);
|
||
}
|
||
|
||
|
||
int
|
||
_gpgme_io_connect (int fd, struct sockaddr *addr, int addrlen)
|
||
{
|
||
int res;
|
||
|
||
TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_connect", fd,
|
||
"addr=%p, addrlen=%i", addr, addrlen);
|
||
|
||
do
|
||
res = ath_connect (fd, addr, addrlen);
|
||
while (res == -1 && errno == EINTR);
|
||
|
||
return TRACE_SYSRES (res);
|
||
}
|