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789 lines
22 KiB
C
789 lines
22 KiB
C
/* ldap-wrapper.c - LDAP access via a wrapper process
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* Copyright (C) 2004, 2005, 2007, 2008 g10 Code GmbH
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG 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 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG 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, see <http://www.gnu.org/licenses/>.
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*/
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/*
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We can't use LDAP directly for these reasons:
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1. On some systems the LDAP library uses (indirectly) pthreads and
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that is not compatible with PTh.
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2. It is huge library in particular if TLS comes into play. So
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problems with unfreed memory might turn up and we don't want
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this in a long running daemon.
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3. There is no easy way for timeouts. In particular the timeout
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value does not work for DNS lookups (well, this is usual) and it
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seems not to work while loading a large attribute like a
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CRL. Having a separate process allows us to either tell the
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process to commit suicide or have our own housekepping function
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kill it after some time. The latter also allows proper
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cancellation of a query at any point of time.
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4. Given that we are going out to the network and usually get back
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a long response, the fork/exec overhead is acceptable.
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Note that under WindowsCE the number of processes is strongly
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limited (32 processes including the kernel processes) and thus we
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don't use the process approach but implement a different wrapper in
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ldap-wrapper-ce.c.
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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 <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <time.h>
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#include <npth.h>
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#include "dirmngr.h"
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#include "exechelp.h"
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#include "misc.h"
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#include "ldap-wrapper.h"
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#ifdef HAVE_W32_SYSTEM
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#define setenv(a,b,c) SetEnvironmentVariable ((a),(b))
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#else
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#define pth_close(fd) close(fd)
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#endif
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#ifndef USE_LDAPWRAPPER
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# error This module is not expected to be build.
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#endif
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/* In case sysconf does not return a value we need to have a limit. */
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#ifdef _POSIX_OPEN_MAX
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#define MAX_OPEN_FDS _POSIX_OPEN_MAX
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#else
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#define MAX_OPEN_FDS 20
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#endif
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#define INACTIVITY_TIMEOUT (opt.ldaptimeout + 60*5) /* seconds */
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#define TIMERTICK_INTERVAL 2
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/* To keep track of the LDAP wrapper state we use this structure. */
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struct wrapper_context_s
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{
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struct wrapper_context_s *next;
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pid_t pid; /* The pid of the wrapper process. */
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int printable_pid; /* Helper to print diagnostics after the process has
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been cleaned up. */
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int fd; /* Connected with stdout of the ldap wrapper. */
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gpg_error_t fd_error; /* Set to the gpg_error of the last read error
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if any. */
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int log_fd; /* Connected with stderr of the ldap wrapper. */
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ctrl_t ctrl; /* Connection data. */
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int ready; /* Internally used to mark to be removed contexts. */
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ksba_reader_t reader; /* The ksba reader object or NULL. */
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char *line; /* Used to print the log lines (malloced). */
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size_t linesize;/* Allocated size of LINE. */
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size_t linelen; /* Use size of LINE. */
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time_t stamp; /* The last time we noticed ativity. */
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};
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/* We keep a global list of spawed wrapper process. A separate thread
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makes use of this list to log error messages and to watch out for
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finished processes. */
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static struct wrapper_context_s *wrapper_list;
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/* We need to know whether we are shutting down the process. */
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static int shutting_down;
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/* Close the pth file descriptor FD and set it to -1. */
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#define SAFE_CLOSE(fd) \
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do { int _fd = fd; if (_fd != -1) { close (_fd); fd = -1;} } while (0)
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/* Read a fixed amount of data from READER into BUFFER. */
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static gpg_error_t
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read_buffer (ksba_reader_t reader, unsigned char *buffer, size_t count)
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{
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gpg_error_t err;
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size_t nread;
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while (count)
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{
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err = ksba_reader_read (reader, buffer, count, &nread);
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if (err)
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return err;
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buffer += nread;
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count -= nread;
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}
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return 0;
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}
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/* Release the wrapper context and kill a running wrapper process. */
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static void
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destroy_wrapper (struct wrapper_context_s *ctx)
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{
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if (ctx->pid != (pid_t)(-1))
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{
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gnupg_kill_process (ctx->pid);
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gnupg_release_process (ctx->pid);
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}
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ksba_reader_release (ctx->reader);
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SAFE_CLOSE (ctx->fd);
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SAFE_CLOSE (ctx->log_fd);
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xfree (ctx->line);
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xfree (ctx);
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}
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/* Print the content of LINE to thye log stream but make sure to only
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print complete lines. Using NULL for LINE will flush any pending
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output. LINE may be modified by this fucntion. */
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static void
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print_log_line (struct wrapper_context_s *ctx, char *line)
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{
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char *s;
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size_t n;
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if (!line)
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{
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if (ctx->line && ctx->linelen)
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{
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log_info ("%s\n", ctx->line);
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ctx->linelen = 0;
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}
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return;
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}
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while ((s = strchr (line, '\n')))
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{
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*s = 0;
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if (ctx->line && ctx->linelen)
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{
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log_info ("%s", ctx->line);
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ctx->linelen = 0;
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log_printf ("%s\n", line);
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}
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else
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log_info ("%s\n", line);
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line = s + 1;
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}
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n = strlen (line);
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if (n)
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{
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if (ctx->linelen + n + 1 >= ctx->linesize)
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{
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char *tmp;
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size_t newsize;
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newsize = ctx->linesize + ((n + 255) & ~255) + 1;
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tmp = (ctx->line ? xtryrealloc (ctx->line, newsize)
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: xtrymalloc (newsize));
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if (!tmp)
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{
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log_error (_("error printing log line: %s\n"), strerror (errno));
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return;
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}
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ctx->line = tmp;
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ctx->linesize = newsize;
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}
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memcpy (ctx->line + ctx->linelen, line, n);
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ctx->linelen += n;
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ctx->line[ctx->linelen] = 0;
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}
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}
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/* Read data from the log stream. Returns true if the log stream
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indicated EOF or error. */
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static int
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read_log_data (struct wrapper_context_s *ctx)
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{
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int n;
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char line[256];
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/* We must use the npth_read function for pipes, always. */
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do
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n = npth_read (ctx->log_fd, line, sizeof line - 1);
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while (n < 0 && errno == EINTR);
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if (n <= 0) /* EOF or error. */
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{
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if (n < 0)
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log_error (_("error reading log from ldap wrapper %d: %s\n"),
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ctx->pid, strerror (errno));
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print_log_line (ctx, NULL);
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SAFE_CLOSE (ctx->log_fd);
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return 1;
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}
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line[n] = 0;
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print_log_line (ctx, line);
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if (ctx->stamp != (time_t)(-1))
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ctx->stamp = time (NULL);
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return 0;
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}
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/* This function is run by a separate thread to maintain the list of
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wrappers and to log error messages from these wrappers. */
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void *
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ldap_wrapper_thread (void *dummy)
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{
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int nfds;
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struct wrapper_context_s *ctx;
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struct wrapper_context_s *ctx_prev;
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struct timespec abstime;
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struct timespec curtime;
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struct timespec timeout;
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int saved_errno;
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fd_set fdset, read_fdset;
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int ret;
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time_t exptime;
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(void)dummy;
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FD_ZERO (&fdset);
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nfds = -1;
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for (ctx = wrapper_list; ctx; ctx = ctx->next)
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{
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if (ctx->log_fd != -1)
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{
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FD_SET (ctx->log_fd, &fdset);
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if (ctx->log_fd > nfds)
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nfds = ctx->log_fd;
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}
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}
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nfds++;
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npth_clock_gettime (&abstime);
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abstime.tv_sec += TIMERTICK_INTERVAL;
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for (;;)
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{
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int any_action = 0;
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/* POSIX says that fd_set should be implemented as a structure,
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thus a simple assignment is fine to copy the entire set. */
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read_fdset = fdset;
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npth_clock_gettime (&curtime);
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if (!(npth_timercmp (&curtime, &abstime, <)))
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{
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/* Inactivity is checked below. Nothing else to do. */
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// handle_tick ();
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npth_clock_gettime (&abstime);
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abstime.tv_sec += TIMERTICK_INTERVAL;
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}
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npth_timersub (&abstime, &curtime, &timeout);
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/* FIXME: For Windows, we have to use a reader thread on the
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pipe that signals an event (and a npth_select_ev variant). */
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ret = npth_pselect (nfds + 1, &read_fdset, NULL, NULL, &timeout, NULL);
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saved_errno = errno;
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if (ret == -1 && saved_errno != EINTR)
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{
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log_error (_("npth_select failed: %s - waiting 1s\n"),
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strerror (saved_errno));
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npth_sleep (1);
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continue;
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}
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if (ret <= 0)
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/* Interrupt or timeout. Will be handled when calculating the
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next timeout. */
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continue;
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/* All timestamps before exptime should be considered expired. */
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exptime = time (NULL);
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if (exptime > INACTIVITY_TIMEOUT)
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exptime -= INACTIVITY_TIMEOUT;
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/* Note that there is no need to lock the list because we always
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add entries at the head (with a pending event status) and
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thus traversing the list will even work if we have a context
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switch in waitpid (which should anyway only happen with Pth's
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hard system call mapping). */
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for (ctx = wrapper_list; ctx; ctx = ctx->next)
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{
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/* Check whether there is any logging to be done. */
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if (nfds && ctx->log_fd != -1 && FD_ISSET (ctx->log_fd, &read_fdset))
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{
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if (read_log_data (ctx))
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any_action = 1;
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}
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/* Check whether the process is still running. */
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if (ctx->pid != (pid_t)(-1))
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{
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gpg_error_t err;
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int status;
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err = gnupg_wait_process ("[dirmngr_ldap]", ctx->pid, 0,
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&status);
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if (!err)
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{
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log_info (_("ldap wrapper %d ready"), (int)ctx->pid);
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ctx->ready = 1;
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gnupg_release_process (ctx->pid);
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ctx->pid = (pid_t)(-1);
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any_action = 1;
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}
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else if (gpg_err_code (err) == GPG_ERR_GENERAL)
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{
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if (status == 10)
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log_info (_("ldap wrapper %d ready: timeout\n"),
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(int)ctx->pid);
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else
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log_info (_("ldap wrapper %d ready: exitcode=%d\n"),
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(int)ctx->pid, status);
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ctx->ready = 1;
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gnupg_release_process (ctx->pid);
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ctx->pid = (pid_t)(-1);
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any_action = 1;
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}
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else if (gpg_err_code (err) != GPG_ERR_TIMEOUT)
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{
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log_error (_("waiting for ldap wrapper %d failed: %s\n"),
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(int)ctx->pid, gpg_strerror (err));
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any_action = 1;
|
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}
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}
|
||
|
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/* Check whether we should terminate the process. */
|
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if (ctx->pid != (pid_t)(-1)
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&& ctx->stamp != (time_t)(-1) && ctx->stamp < exptime)
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{
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gnupg_kill_process (ctx->pid);
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ctx->stamp = (time_t)(-1);
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log_info (_("ldap wrapper %d stalled - killing\n"),
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(int)ctx->pid);
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/* We need to close the log fd because the cleanup loop
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waits for it. */
|
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SAFE_CLOSE (ctx->log_fd);
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any_action = 1;
|
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}
|
||
}
|
||
|
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/* If something has been printed to the log file or we got an
|
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EOF from a wrapper, we now print the list of active
|
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wrappers. */
|
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if (any_action && DBG_LOOKUP)
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{
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log_info ("ldap worker stati:\n");
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for (ctx = wrapper_list; ctx; ctx = ctx->next)
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log_info (" c=%p pid=%d/%d rdr=%p ctrl=%p/%d la=%lu rdy=%d\n",
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ctx,
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(int)ctx->pid, (int)ctx->printable_pid,
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ctx->reader,
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ctx->ctrl, ctx->ctrl? ctx->ctrl->refcount:0,
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(unsigned long)ctx->stamp, ctx->ready);
|
||
}
|
||
|
||
|
||
/* Use a separate loop to check whether ready marked wrappers
|
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may be removed. We may only do so if the ksba reader object
|
||
is not anymore in use or we are in shutdown state. */
|
||
again:
|
||
for (ctx_prev=NULL, ctx=wrapper_list; ctx; ctx_prev=ctx, ctx=ctx->next)
|
||
if (ctx->ready
|
||
&& ((ctx->log_fd == -1 && !ctx->reader) || shutting_down))
|
||
{
|
||
if (ctx_prev)
|
||
ctx_prev->next = ctx->next;
|
||
else
|
||
wrapper_list = ctx->next;
|
||
destroy_wrapper (ctx);
|
||
/* We need to restart because destroy_wrapper might have
|
||
done a context switch. */
|
||
goto again;
|
||
}
|
||
}
|
||
/*NOTREACHED*/
|
||
return NULL; /* Make the compiler happy. */
|
||
}
|
||
|
||
|
||
|
||
/* Start the reaper thread for the ldap wrapper. */
|
||
void
|
||
ldap_wrapper_launch_thread (void)
|
||
{
|
||
static int done;
|
||
npth_attr_t tattr;
|
||
npth_t thread;
|
||
int err;
|
||
|
||
if (done)
|
||
return;
|
||
done = 1;
|
||
|
||
npth_attr_init (&tattr);
|
||
npth_attr_setdetachstate (&tattr, NPTH_CREATE_DETACHED);
|
||
|
||
err = npth_create (&thread, &tattr, ldap_wrapper_thread, NULL);
|
||
if (err)
|
||
{
|
||
log_error (_("error spawning ldap wrapper reaper thread: %s\n"),
|
||
strerror (err) );
|
||
dirmngr_exit (1);
|
||
}
|
||
npth_setname_np (thread, "ldap-reaper");
|
||
npth_attr_destroy (&tattr);
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
/* Wait until all ldap wrappers have terminated. We assume that the
|
||
kill has already been sent to all of them. */
|
||
void
|
||
ldap_wrapper_wait_connections ()
|
||
{
|
||
shutting_down = 1;
|
||
/* FIXME: This is a busy wait. */
|
||
while (wrapper_list)
|
||
npth_usleep (200);
|
||
}
|
||
|
||
|
||
/* This function is to be used to release a context associated with the
|
||
given reader object. */
|
||
void
|
||
ldap_wrapper_release_context (ksba_reader_t reader)
|
||
{
|
||
struct wrapper_context_s *ctx;
|
||
|
||
if (!reader )
|
||
return;
|
||
|
||
for (ctx=wrapper_list; ctx; ctx=ctx->next)
|
||
if (ctx->reader == reader)
|
||
{
|
||
if (DBG_LOOKUP)
|
||
log_info ("releasing ldap worker c=%p pid=%d/%d rdr=%p ctrl=%p/%d\n",
|
||
ctx,
|
||
(int)ctx->pid, (int)ctx->printable_pid,
|
||
ctx->reader,
|
||
ctx->ctrl, ctx->ctrl? ctx->ctrl->refcount:0);
|
||
|
||
ctx->reader = NULL;
|
||
SAFE_CLOSE (ctx->fd);
|
||
if (ctx->ctrl)
|
||
{
|
||
ctx->ctrl->refcount--;
|
||
ctx->ctrl = NULL;
|
||
}
|
||
if (ctx->fd_error)
|
||
log_info (_("reading from ldap wrapper %d failed: %s\n"),
|
||
ctx->printable_pid, gpg_strerror (ctx->fd_error));
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Cleanup all resources held by the connection associated with
|
||
CTRL. This is used after a cancel to kill running wrappers. */
|
||
void
|
||
ldap_wrapper_connection_cleanup (ctrl_t ctrl)
|
||
{
|
||
struct wrapper_context_s *ctx;
|
||
|
||
for (ctx=wrapper_list; ctx; ctx=ctx->next)
|
||
if (ctx->ctrl && ctx->ctrl == ctrl)
|
||
{
|
||
ctx->ctrl->refcount--;
|
||
ctx->ctrl = NULL;
|
||
if (ctx->pid != (pid_t)(-1))
|
||
gnupg_kill_process (ctx->pid);
|
||
if (ctx->fd_error)
|
||
log_info (_("reading from ldap wrapper %d failed: %s\n"),
|
||
ctx->printable_pid, gpg_strerror (ctx->fd_error));
|
||
}
|
||
}
|
||
|
||
|
||
/* This is the callback used by the ldap wrapper to feed the ksba
|
||
reader with the wrappers stdout. See the description of
|
||
ksba_reader_set_cb for details. */
|
||
static int
|
||
reader_callback (void *cb_value, char *buffer, size_t count, size_t *nread)
|
||
{
|
||
struct wrapper_context_s *ctx = cb_value;
|
||
size_t nleft = count;
|
||
int nfds;
|
||
struct timespec abstime;
|
||
struct timespec curtime;
|
||
struct timespec timeout;
|
||
int saved_errno;
|
||
fd_set fdset, read_fdset;
|
||
int ret;
|
||
|
||
/* FIXME: We might want to add some internal buffering because the
|
||
ksba code does not do any buffering for itself (because a ksba
|
||
reader may be detached from another stream to read other data and
|
||
the it would be cumbersome to get back already buffered
|
||
stuff). */
|
||
|
||
if (!buffer && !count && !nread)
|
||
return -1; /* Rewind is not supported. */
|
||
|
||
/* If we ever encountered a read error don't allow to continue and
|
||
possible overwrite the last error cause. Bail out also if the
|
||
file descriptor has been closed. */
|
||
if (ctx->fd_error || ctx->fd == -1)
|
||
{
|
||
*nread = 0;
|
||
return -1;
|
||
}
|
||
|
||
FD_ZERO (&fdset);
|
||
FD_SET (ctx->fd, &fdset);
|
||
nfds = ctx->fd + 1;
|
||
|
||
npth_clock_gettime (&abstime);
|
||
abstime.tv_sec += TIMERTICK_INTERVAL;
|
||
|
||
while (nleft > 0)
|
||
{
|
||
int n;
|
||
gpg_error_t err;
|
||
|
||
npth_clock_gettime (&curtime);
|
||
if (!(npth_timercmp (&curtime, &abstime, <)))
|
||
{
|
||
err = dirmngr_tick (ctx->ctrl);
|
||
if (err)
|
||
{
|
||
ctx->fd_error = err;
|
||
SAFE_CLOSE (ctx->fd);
|
||
return -1;
|
||
}
|
||
npth_clock_gettime (&abstime);
|
||
abstime.tv_sec += TIMERTICK_INTERVAL;
|
||
}
|
||
npth_timersub (&abstime, &curtime, &timeout);
|
||
|
||
read_fdset = fdset;
|
||
ret = npth_pselect (nfds, &read_fdset, NULL, NULL, &timeout, NULL);
|
||
saved_errno = errno;
|
||
|
||
if (ret == -1 && saved_errno != EINTR)
|
||
{
|
||
ctx->fd_error = gpg_error_from_errno (errno);
|
||
SAFE_CLOSE (ctx->fd);
|
||
return -1;
|
||
}
|
||
if (ret <= 0)
|
||
/* Timeout. Will be handled when calculating the next timeout. */
|
||
continue;
|
||
|
||
/* This should not block now that select returned with a file
|
||
descriptor. So it shouldn't be necessary to use npth_read
|
||
(and it is slightly dangerous in the sense that a concurrent
|
||
thread might (accidentially?) change the status of ctx->fd
|
||
before we read. FIXME: Set ctx->fd to nonblocking? */
|
||
n = read (ctx->fd, buffer, nleft);
|
||
if (n < 0)
|
||
{
|
||
ctx->fd_error = gpg_error_from_errno (errno);
|
||
SAFE_CLOSE (ctx->fd);
|
||
return -1;
|
||
}
|
||
else if (!n)
|
||
{
|
||
if (nleft == count)
|
||
return -1; /* EOF. */
|
||
break;
|
||
}
|
||
nleft -= n;
|
||
buffer += n;
|
||
if (n > 0 && ctx->stamp != (time_t)(-1))
|
||
ctx->stamp = time (NULL);
|
||
}
|
||
*nread = count - nleft;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Fork and exec the LDAP wrapper and return a new libksba reader
|
||
object at READER. ARGV is a NULL terminated list of arguments for
|
||
the wrapper. The function returns 0 on success or an error code.
|
||
|
||
Special hack to avoid passing a password through the command line
|
||
which is globally visible: If the first element of ARGV is "--pass"
|
||
it will be removed and instead the environment variable
|
||
DIRMNGR_LDAP_PASS will be set to the next value of ARGV. On modern
|
||
OSes the environment is not visible to other users. For those old
|
||
systems where it can't be avoided, we don't want to go into the
|
||
hassle of passing the password via stdin; it's just too complicated
|
||
and an LDAP password used for public directory lookups should not
|
||
be that confidential. */
|
||
gpg_error_t
|
||
ldap_wrapper (ctrl_t ctrl, ksba_reader_t *reader, const char *argv[])
|
||
{
|
||
gpg_error_t err;
|
||
pid_t pid;
|
||
struct wrapper_context_s *ctx;
|
||
int i;
|
||
int j;
|
||
const char **arg_list;
|
||
const char *pgmname;
|
||
int outpipe[2], errpipe[2];
|
||
|
||
/* It would be too simple to connect stderr just to our logging
|
||
stream. The problem is that if we are running multi-threaded
|
||
everything gets intermixed. Clearly we don't want this. So the
|
||
only viable solutions are either to have another thread
|
||
responsible for logging the messages or to add an option to the
|
||
wrapper module to do the logging on its own. Given that we anyway
|
||
need a way to rip the child process and this is best done using a
|
||
general ripping thread, that thread can do the logging too. */
|
||
|
||
*reader = NULL;
|
||
|
||
/* Files: We need to prepare stdin and stdout. We get stderr from
|
||
the function. */
|
||
if (!opt.ldap_wrapper_program || !*opt.ldap_wrapper_program)
|
||
pgmname = gnupg_module_name (GNUPG_MODULE_NAME_DIRMNGR_LDAP);
|
||
else
|
||
pgmname = opt.ldap_wrapper_program;
|
||
|
||
/* Create command line argument array. */
|
||
for (i = 0; argv[i]; i++)
|
||
;
|
||
arg_list = xtrycalloc (i + 2, sizeof *arg_list);
|
||
if (!arg_list)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error (_("error allocating memory: %s\n"), strerror (errno));
|
||
return err;
|
||
}
|
||
for (i = j = 0; argv[i]; i++, j++)
|
||
if (!i && argv[i + 1] && !strcmp (*argv, "--pass"))
|
||
{
|
||
arg_list[j] = "--env-pass";
|
||
setenv ("DIRMNGR_LDAP_PASS", argv[1], 1);
|
||
i++;
|
||
}
|
||
else
|
||
arg_list[j] = (char*) argv[i];
|
||
|
||
ctx = xtrycalloc (1, sizeof *ctx);
|
||
if (!ctx)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error (_("error allocating memory: %s\n"), strerror (errno));
|
||
xfree (arg_list);
|
||
return err;
|
||
}
|
||
|
||
err = gnupg_create_inbound_pipe (outpipe);
|
||
if (!err)
|
||
{
|
||
err = gnupg_create_inbound_pipe (errpipe);
|
||
if (err)
|
||
{
|
||
close (outpipe[0]);
|
||
close (outpipe[1]);
|
||
}
|
||
}
|
||
if (err)
|
||
{
|
||
log_error (_("error creating a pipe: %s\n"), gpg_strerror (err));
|
||
xfree (arg_list);
|
||
xfree (ctx);
|
||
return err;
|
||
}
|
||
|
||
err = gnupg_spawn_process_fd (pgmname, arg_list,
|
||
-1, outpipe[1], errpipe[1], &pid);
|
||
xfree (arg_list);
|
||
close (outpipe[1]);
|
||
close (errpipe[1]);
|
||
if (err)
|
||
{
|
||
close (outpipe[0]);
|
||
close (errpipe[0]);
|
||
xfree (ctx);
|
||
return err;
|
||
}
|
||
|
||
ctx->pid = pid;
|
||
ctx->printable_pid = (int) pid;
|
||
ctx->fd = outpipe[0];
|
||
ctx->log_fd = errpipe[0];
|
||
ctx->ctrl = ctrl;
|
||
ctrl->refcount++;
|
||
ctx->stamp = time (NULL);
|
||
|
||
err = ksba_reader_new (reader);
|
||
if (!err)
|
||
err = ksba_reader_set_cb (*reader, reader_callback, ctx);
|
||
if (err)
|
||
{
|
||
log_error (_("error initializing reader object: %s\n"),
|
||
gpg_strerror (err));
|
||
destroy_wrapper (ctx);
|
||
ksba_reader_release (*reader);
|
||
*reader = NULL;
|
||
return err;
|
||
}
|
||
|
||
/* Hook the context into our list of running wrappers. */
|
||
ctx->reader = *reader;
|
||
ctx->next = wrapper_list;
|
||
wrapper_list = ctx;
|
||
if (opt.verbose)
|
||
log_info ("ldap wrapper %d started (reader %p)\n",
|
||
(int)ctx->pid, ctx->reader);
|
||
|
||
/* Need to wait for the first byte so we are able to detect an empty
|
||
output and not let the consumer see an EOF without further error
|
||
indications. The CRL loading logic assumes that after return
|
||
from this function, a failed search (e.g. host not found ) is
|
||
indicated right away. */
|
||
{
|
||
unsigned char c;
|
||
|
||
err = read_buffer (*reader, &c, 1);
|
||
if (err)
|
||
{
|
||
ldap_wrapper_release_context (*reader);
|
||
ksba_reader_release (*reader);
|
||
*reader = NULL;
|
||
if (gpg_err_code (err) == GPG_ERR_EOF)
|
||
return gpg_error (GPG_ERR_NO_DATA);
|
||
else
|
||
return err;
|
||
}
|
||
ksba_reader_unread (*reader, &c, 1);
|
||
}
|
||
|
||
return 0;
|
||
}
|