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-rw-r--r--assuan/assuan-pipe-connect.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/assuan/assuan-pipe-connect.c b/assuan/assuan-pipe-connect.c
new file mode 100644
index 000000000..ccfc1f016
--- /dev/null
+++ b/assuan/assuan-pipe-connect.c
@@ -0,0 +1,269 @@
+/* assuan-pipe-connect.c - Establish a pipe connection (client)
+ * Copyright (C) 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "assuan-defs.h"
+
+#ifdef _POSIX_OPEN_MAX
+#define MAX_OPEN_FDS _POSIX_OPEN_MAX
+#else
+#define MAX_OPEN_FDS 20
+#endif
+
+#ifdef HAVE_JNLIB_LOGGING
+#include "../jnlib/logging.h"
+#define LOGERROR1(a,b) log_error ((a), (b))
+#else
+#define LOGERROR1(a,b) fprintf (stderr, (a), (b))
+#endif
+
+
+
+static int
+writen ( int fd, const char *buffer, size_t length )
+{
+ while (length)
+ {
+ int nwritten = write (fd, buffer, length);
+
+ if (nwritten < 0)
+ {
+ if (errno == EINTR)
+ continue;
+ return -1; /* write error */
+ }
+ length -= nwritten;
+ buffer += nwritten;
+ }
+ return 0; /* okay */
+}
+
+
+static int
+do_finish (ASSUAN_CONTEXT ctx)
+{
+ if (ctx->inbound.fd != -1)
+ {
+ close (ctx->inbound.fd);
+ ctx->inbound.fd = -1;
+ }
+ if (ctx->outbound.fd != -1)
+ {
+ close (ctx->outbound.fd);
+ ctx->outbound.fd = -1;
+ }
+ if (ctx->pid != -1)
+ {
+ waitpid (ctx->pid, NULL, 0); /* FIXME Check return value. */
+ ctx->pid = -1;
+ }
+ return 0;
+}
+
+static void
+do_deinit (ASSUAN_CONTEXT ctx)
+{
+ do_finish (ctx);
+}
+
+
+
+/* Connect to a server over a pipe, creating the assuan context and
+ returning it in CTX. The server filename is NAME, the argument
+ vector in ARGV. FD_CHILD_LIST is a -1 terminated list of file
+ descriptors not to close in the child. */
+AssuanError
+assuan_pipe_connect (ASSUAN_CONTEXT *ctx, const char *name, char *const argv[],
+ int *fd_child_list)
+{
+ static int fixed_signals = 0;
+ AssuanError err;
+ int rp[2];
+ int wp[2];
+
+ if (!ctx || !name || !argv || !argv[0])
+ return ASSUAN_Invalid_Value;
+
+ if (!fixed_signals)
+ {
+ struct sigaction act;
+
+ sigaction (SIGPIPE, NULL, &act);
+ if (act.sa_handler == SIG_DFL)
+ {
+ act.sa_handler = SIG_IGN;
+ sigemptyset (&act.sa_mask);
+ act.sa_flags = 0;
+ sigaction (SIGPIPE, &act, NULL);
+ }
+ fixed_signals = 1;
+ /* FIXME: This is not MT safe */
+ }
+
+ if (pipe (rp) < 0)
+ return ASSUAN_General_Error;
+
+ if (pipe (wp) < 0)
+ {
+ close (rp[0]);
+ close (rp[1]);
+ return ASSUAN_General_Error;
+ }
+
+ err = _assuan_new_context (ctx);
+ if (err)
+ {
+ close (rp[0]);
+ close (rp[1]);
+ close (wp[0]);
+ close (wp[1]);
+ return err;
+ }
+ (*ctx)->pipe_mode = 1;
+ (*ctx)->inbound.fd = rp[0]; /* Our inbound is read end of read pipe. */
+ (*ctx)->outbound.fd = wp[1]; /* Our outbound is write end of write pipe. */
+ (*ctx)->deinit_handler = do_deinit;
+ (*ctx)->finish_handler = do_finish;
+
+ (*ctx)->pid = fork ();
+ if ((*ctx)->pid < 0)
+ {
+ close (rp[0]);
+ close (rp[1]);
+ close (wp[0]);
+ close (wp[1]);
+ _assuan_release_context (*ctx);
+ return ASSUAN_General_Error;
+ }
+
+ if ((*ctx)->pid == 0)
+ {
+ int i, n;
+ char errbuf[512];
+#ifdef HAVE_JNLIB_LOGGING
+ int log_fd = log_get_fd ();
+#endif
+ /* close all files which will not be duped but keep stderr
+ and log_stream for now */
+ n = sysconf (_SC_OPEN_MAX);
+ if (n < 0)
+ n = MAX_OPEN_FDS;
+ for (i=0; i < n; i++)
+ {
+ int *fdp = fd_child_list;
+
+ if (fdp)
+ {
+ while (*fdp != -1 && *fdp != i)
+ fdp++;
+ }
+
+ if (!(fdp && *fdp != -1)
+ && i != fileno (stderr)
+#ifdef HAVE_JNLIB_LOGGING
+ && i != log_fd
+#endif
+ && i != rp[1] && i != wp[0])
+ close(i);
+ }
+ errno = 0;
+
+ /* Dup handles and to stdin/stdout and exec */
+ if (rp[1] != STDOUT_FILENO)
+ {
+ if (dup2 (rp[1], STDOUT_FILENO) == -1)
+ {
+ LOGERROR1 ("dup2 failed in child: %s\n", strerror (errno));
+ _exit (4);
+ }
+ close (rp[1]);
+ }
+ if (wp[0] != STDIN_FILENO)
+ {
+ if (dup2 (wp[0], STDIN_FILENO) == -1)
+ {
+ LOGERROR1 ("dup2 failed in child: %s\n", strerror (errno));
+ _exit (4);
+ }
+ close (wp[0]);
+ }
+
+ execv (name, argv);
+ /* oops - use the pipe to tell the parent about it */
+ snprintf (errbuf, sizeof(errbuf)-1, "ERR %d can't exec `%s': %.50s\n",
+ ASSUAN_Problem_Starting_Server, name, strerror (errno));
+ errbuf[sizeof(errbuf)-1] = 0;
+ writen (1, errbuf, strlen (errbuf));
+ _exit (4);
+ }
+
+ close (rp[1]);
+ close (wp[0]);
+
+ /* initial handshake */
+ {
+ int okay, off;
+
+ err = _assuan_read_from_server (*ctx, &okay, &off);
+ if (err)
+ {
+ LOGERROR1 ("can't connect server: %s\n", assuan_strerror (err));
+ }
+ else if (okay != 1)
+ {
+ LOGERROR1 ("can't connect server: `%s'\n", (*ctx)->inbound.line);
+ err = ASSUAN_Connect_Failed;
+ }
+ }
+
+ if (err)
+ {
+ assuan_disconnect (*ctx);
+ *ctx = NULL;
+ }
+
+ return err;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+