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-rw-r--r--src/util/pass_accept.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/src/util/pass_accept.c b/src/util/pass_accept.c
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+++ b/src/util/pass_accept.c
@@ -0,0 +1,106 @@
+/*++
+/* NAME
+/* pass_accept 3
+/* SUMMARY
+/* start UNIX-domain file descriptor listener
+/* SYNOPSIS
+/* #include <listen.h>
+/*
+/* int pass_accept(listen_fd)
+/* int listen_fd;
+/*
+/* int pass_accept_attr(listen_fd, attr)
+/* int listen_fd;
+/* HTABLE **attr;
+/* DESCRIPTION
+/* This module implements a listener that receives one attribute list
+/* and file descriptor over each a local connection that is made to it.
+/*
+/* Arguments:
+/* .IP attr
+/* Pointer to attribute list pointer. In case of error, or
+/* no attributes, the attribute list pointer is set to null.
+/* .IP listen_fd
+/* File descriptor returned by LOCAL_LISTEN().
+/* DIAGNOSTICS
+/* Warnings: I/O errors, timeout.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <errno.h>
+#include <unistd.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <listen.h>
+#include <attr.h>
+
+#define PASS_ACCEPT_TMOUT 100
+
+/* pass_accept - accept descriptor */
+
+int pass_accept(int listen_fd)
+{
+ const char *myname = "pass_accept";
+ int accept_fd;
+ int recv_fd = -1;
+
+ accept_fd = LOCAL_ACCEPT(listen_fd);
+ if (accept_fd < 0) {
+ if (errno != EAGAIN)
+ msg_warn("%s: cannot accept connection: %m", myname);
+ return (-1);
+ } else {
+ if (read_wait(accept_fd, PASS_ACCEPT_TMOUT) < 0)
+ msg_warn("%s: timeout receiving file descriptor: %m", myname);
+ else if ((recv_fd = LOCAL_RECV_FD(accept_fd)) < 0)
+ msg_warn("%s: cannot receive file descriptor: %m", myname);
+ if (close(accept_fd) < 0)
+ msg_warn("%s: close: %m", myname);
+ return (recv_fd);
+ }
+}
+
+/* pass_accept_attr - accept descriptor and attribute list */
+
+int pass_accept_attr(int listen_fd, HTABLE **attr)
+{
+ const char *myname = "pass_accept_attr";
+ int accept_fd;
+ int recv_fd = -1;
+
+ *attr = 0;
+ accept_fd = LOCAL_ACCEPT(listen_fd);
+ if (accept_fd < 0) {
+ if (errno != EAGAIN)
+ msg_warn("%s: cannot accept connection: %m", myname);
+ return (-1);
+ } else {
+ if (read_wait(accept_fd, PASS_ACCEPT_TMOUT) < 0)
+ msg_warn("%s: timeout receiving file descriptor: %m", myname);
+ else if ((recv_fd = LOCAL_RECV_FD(accept_fd)) < 0)
+ msg_warn("%s: cannot receive file descriptor: %m", myname);
+ else if (read_wait(accept_fd, PASS_ACCEPT_TMOUT) < 0
+ || recv_pass_attr(accept_fd, attr, PASS_ACCEPT_TMOUT, 0) < 0) {
+ msg_warn("%s: cannot receive connection attributes: %m", myname);
+ if (close(recv_fd) < 0)
+ msg_warn("%s: close: %m", myname);
+ recv_fd = -1;
+ }
+ if (close(accept_fd) < 0)
+ msg_warn("%s: close: %m", myname);
+ return (recv_fd);
+ }
+}