linuxptp/uds.c

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/**
* @file uds.c
* @note Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
*
* This program 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.
*
* This program 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#include "contain.h"
#include "print.h"
#include "transport_private.h"
#include "uds.h"
#define UDS_FILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) /*0660*/
struct uds {
struct transport t;
struct sockaddr_un sa;
socklen_t len;
};
static int uds_close(struct transport *t, struct fdarray *fda)
{
close(fda->fd[FD_GENERAL]);
return 0;
}
static int uds_open(struct transport *t, char *name, struct fdarray *fda,
enum timestamp_type tt)
{
int fd, err;
struct sockaddr_un sa;
struct uds *uds = container_of(t, struct uds, t);
fd = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (fd < 0) {
pr_err("uds: failed to create socket: %m");
return -1;
}
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_LOCAL;
strcpy(sa.sun_path, name);
unlink(name);
err = bind(fd, (struct sockaddr *) &sa, sizeof(sa));
if (err < 0) {
pr_err("uds: bind failed: %m");
close(fd);
return -1;
}
/* For client use, pre load the server path. */
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_LOCAL;
strcpy(sa.sun_path, UDS_PATH);
uds->sa = sa;
uds->len = sizeof(sa);
chmod(name, UDS_FILEMODE);
fda->fd[FD_GENERAL] = fd;
return 0;
}
static int uds_recv(struct transport *t, int fd, void *buf, int buflen,
struct hw_timestamp *hwts)
{
int cnt;
struct uds *uds = container_of(t, struct uds, t);
socklen_t *len = &uds->len;
uds->len = sizeof(uds->sa);
cnt = recvfrom(fd, buf, buflen, 0, (struct sockaddr *) &uds->sa, len);
if (cnt <= 0) {
pr_err("uds: recvfrom failed: %m");
}
return cnt;
}
static int uds_send(struct transport *t, struct fdarray *fda, int event,
int peer, void *buf, int buflen, struct hw_timestamp *hwts)
{
int cnt, fd = fda->fd[FD_GENERAL];
struct uds *uds = container_of(t, struct uds, t);
cnt = sendto(fd, buf, buflen, 0, (struct sockaddr *) &uds->sa, uds->len);
if (cnt <= 0) {
pr_err("uds: sendto failed: %m");
}
return cnt;
}
static void uds_release(struct transport *t)
{
struct uds *uds = container_of(t, struct uds, t);
free(uds);
}
struct transport *uds_transport_create(void)
{
struct uds *uds;
uds = calloc(1, sizeof(*uds));
if (!uds)
return NULL;
uds->t.close = uds_close;
uds->t.open = uds_open;
uds->t.recv = uds_recv;
uds->t.send = uds_send;
uds->t.release = uds_release;
return &uds->t;
}