148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
/**
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* @file uds.c
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* @note Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "address.h"
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#include "contain.h"
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#include "print.h"
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#include "transport_private.h"
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#include "uds.h"
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char uds_path[MAX_IFNAME_SIZE + 1] = "/var/run/ptp4l";
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#define UDS_FILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) /*0660*/
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struct uds {
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struct transport t;
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struct address address;
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};
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static int uds_close(struct transport *t, struct fdarray *fda)
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{
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struct sockaddr_un sa;
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socklen_t len = sizeof(sa);
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if (!getsockname(fda->fd[FD_GENERAL], (struct sockaddr *) &sa, &len) &&
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sa.sun_family == AF_LOCAL) {
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unlink(sa.sun_path);
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}
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close(fda->fd[FD_GENERAL]);
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return 0;
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}
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static int uds_open(struct transport *t, const char *name, struct fdarray *fda,
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enum timestamp_type tt)
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{
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int fd, err;
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struct sockaddr_un sa;
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struct uds *uds = container_of(t, struct uds, t);
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fd = socket(AF_LOCAL, SOCK_DGRAM, 0);
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if (fd < 0) {
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pr_err("uds: failed to create socket: %m");
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return -1;
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}
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memset(&sa, 0, sizeof(sa));
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sa.sun_family = AF_LOCAL;
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strncpy(sa.sun_path, name, sizeof(sa.sun_path) - 1);
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unlink(name);
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err = bind(fd, (struct sockaddr *) &sa, sizeof(sa));
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if (err < 0) {
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pr_err("uds: bind failed: %m");
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close(fd);
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return -1;
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}
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/* For client use, pre load the server path. */
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memset(&sa, 0, sizeof(sa));
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sa.sun_family = AF_LOCAL;
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strncpy(sa.sun_path, uds_path, sizeof(sa.sun_path) - 1);
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uds->address.sun = sa;
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uds->address.len = sizeof(sa);
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chmod(name, UDS_FILEMODE);
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fda->fd[FD_EVENT] = -1;
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fda->fd[FD_GENERAL] = fd;
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return 0;
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}
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static int uds_recv(struct transport *t, int fd, void *buf, int buflen,
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struct address *addr, struct hw_timestamp *hwts)
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{
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int cnt;
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struct uds *uds = container_of(t, struct uds, t);
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addr->len = sizeof(addr->sun);
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cnt = recvfrom(fd, buf, buflen, 0, &addr->sa, &addr->len);
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if (cnt <= 0) {
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pr_err("uds: recvfrom failed: %m");
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return cnt;
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}
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uds->address = *addr;
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return cnt;
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}
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static int uds_send(struct transport *t, struct fdarray *fda, int event,
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int peer, void *buf, int buflen, struct address *addr,
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struct hw_timestamp *hwts)
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{
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int cnt, fd = fda->fd[FD_GENERAL];
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struct uds *uds = container_of(t, struct uds, t);
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if (!addr)
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addr = &uds->address;
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cnt = sendto(fd, buf, buflen, 0, &addr->sa, addr->len);
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if (cnt <= 0 && errno != ECONNREFUSED) {
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pr_err("uds: sendto failed: %m");
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}
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return cnt;
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}
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static void uds_release(struct transport *t)
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{
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struct uds *uds = container_of(t, struct uds, t);
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free(uds);
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}
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struct transport *uds_transport_create(void)
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{
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struct uds *uds;
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uds = calloc(1, sizeof(*uds));
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if (!uds)
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return NULL;
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uds->t.close = uds_close;
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uds->t.open = uds_open;
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uds->t.recv = uds_recv;
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uds->t.send = uds_send;
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uds->t.release = uds_release;
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return &uds->t;
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}
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