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/*++
/* NAME
/* unix_dgram_listen 3
/* SUMMARY
/* listen to UNIX-domain datagram server
/* SYNOPSIS
/* #include <listen.h>
/*
/* int unix_dgram_listen(
/* const char *path,
/* int block_mode)
/* DESCRIPTION
/* unix_dgram_listen() binds to the specified UNIX-domain
/* datagram endpoint, and returns the resulting file descriptor.
/*
/* Arguments:
/* .IP path
/* Null-terminated string with connection destination.
/* .IP backlog
/* Either NON_BLOCKING for a non-blocking socket, or BLOCKING for
/* blocking mode.
/* DIAGNOSTICS
/* Fatal errors: path too large, can't create socket.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/*
* System library.
*/
#include <sys_defs.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
/*
* Utility library.
*/
#include <iostuff.h>
#include <listen.h>
#include <msg.h>
/* unix_dgram_listen - bind to UNIX-domain datagram endpoint */
int unix_dgram_listen(const char *path, int block_mode)
{
const char myname[] = "unix_dgram_listen";
#undef sun
struct sockaddr_un sun;
ssize_t path_len;
int sock;
/*
* Translate address information to internal form.
*/
if ((path_len = strlen(path)) >= sizeof(sun.sun_path))
msg_fatal("%s: unix-domain name too long: %s", myname, path);
memset((void *) &sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
#ifdef HAS_SUN_LEN
sun.sun_len = path_len + 1;
#endif
memcpy(sun.sun_path, path, path_len + 1);
/*
* Create a 'server' socket.
*/
if ((sock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
msg_fatal("%s: socket: %m", myname);
if (unlink(path) < 0 && errno != ENOENT)
msg_fatal( "remove %s: %m", path);
if (bind(sock, (struct sockaddr *) & sun, sizeof(sun)) < 0)
msg_fatal( "bind: %s: %m", path);
#ifdef FCHMOD_UNIX_SOCKETS
if (fchmod(sock, 0666) < 0)
msg_fatal("fchmod socket %s: %m", path);
#else
if (chmod(path, 0666) < 0)
msg_fatal("chmod socket %s: %m", path);
#endif
non_blocking(sock, block_mode);
return (sock);
}
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