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/*++
/* NAME
/* unix_listen 3
/* SUMMARY
/* start UNIX-domain listener
/* SYNOPSIS
/* #include <listen.h>
/*
/* int unix_listen(addr, backlog, block_mode)
/* const char *addr;
/* int backlog;
/* int block_mode;
/*
/* int unix_accept(fd)
/* int fd;
/* DESCRIPTION
/* The \fBunix_listen\fR() routine starts a listener in the UNIX domain
/* on the specified address, with the specified backlog, and returns
/* the resulting file descriptor.
/*
/* unix_accept() accepts a connection and sanitizes error results.
/*
/* Arguments:
/* .IP addr
/* Null-terminated string with connection destination.
/* .IP backlog
/* This argument is passed on to the \fIlisten(2)\fR routine.
/* .IP block_mode
/* Either NON_BLOCKING for a non-blocking socket, or BLOCKING for
/* blocking mode.
/* .IP fd
/* File descriptor returned by unix_listen().
/* DIAGNOSTICS
/* Fatal errors: unix_listen() aborts upon any system call failure.
/* unix_accept() leaves all error handling up to the caller.
/* 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 interfaces. */
#include <sys_defs.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
/* Utility library. */
#include "msg.h"
#include "iostuff.h"
#include "listen.h"
#include "sane_accept.h"
/* unix_listen - create UNIX-domain listener */
int unix_listen(const char *addr, int backlog, int block_mode)
{
#undef sun
struct sockaddr_un sun;
ssize_t len = strlen(addr);
int sock;
/*
* Translate address information to internal form.
*/
if (len >= sizeof(sun.sun_path))
msg_fatal("unix-domain name too long: %s", addr);
memset((void *) &sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
#ifdef HAS_SUN_LEN
sun.sun_len = len + 1;
#endif
memcpy(sun.sun_path, addr, len + 1);
/*
* Create a listener socket. Do whatever we can so we don't run into
* trouble when this process is restarted after crash.
*/
if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
msg_fatal("socket: %m");
if (unlink(addr) < 0 && errno != ENOENT)
msg_fatal("remove %s: %m", addr);
if (bind(sock, (struct sockaddr *) &sun, sizeof(sun)) < 0)
msg_fatal("bind: %s: %m", addr);
#ifdef FCHMOD_UNIX_SOCKETS
if (fchmod(sock, 0666) < 0)
msg_fatal("fchmod socket %s: %m", addr);
#else
if (chmod(addr, 0666) < 0)
msg_fatal("chmod socket %s: %m", addr);
#endif
non_blocking(sock, block_mode);
if (listen(sock, backlog) < 0)
msg_fatal("listen: %m");
return (sock);
}
/* unix_accept - accept connection */
int unix_accept(int fd)
{
return (sane_accept(fd, (struct sockaddr *) 0, (SOCKADDR_SIZE *) 0));
}
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