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/**
* \file socket.c
* \brief Socket helper routines
* \author Abramo Bagnara <abramo@alsa-project.org>
* \date 2003
*/
/*
* Socket helper routines
* Copyright (c) 2003 by Abramo Bagnara <abramo@alsa-project.org>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netdb.h>
#include "local.h"
#ifndef DOC_HIDDEN
int snd_send_fd(int sock, void *data, size_t len, int fd)
{
int ret;
size_t cmsg_len = CMSG_LEN(sizeof(int));
struct cmsghdr *cmsg = alloca(cmsg_len);
int *fds = (int *) CMSG_DATA(cmsg);
struct msghdr msghdr;
struct iovec vec;
vec.iov_base = (void *)&data;
vec.iov_len = len;
cmsg->cmsg_len = cmsg_len;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*fds = fd;
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
msghdr.msg_control = cmsg;
msghdr.msg_controllen = cmsg_len;
msghdr.msg_flags = 0;
ret = sendmsg(sock, &msghdr, 0 );
if (ret < 0) {
SYSERR("sendmsg failed");
return -errno;
}
return ret;
}
int snd_receive_fd(int sock, void *data, size_t len, int *fd)
{
int ret;
size_t cmsg_len = CMSG_LEN(sizeof(int));
struct cmsghdr *cmsg = alloca(cmsg_len);
int *fds = (int *) CMSG_DATA(cmsg);
struct msghdr msghdr;
struct iovec vec;
vec.iov_base = (void *)&data;
vec.iov_len = len;
cmsg->cmsg_len = cmsg_len;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*fds = -1;
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
msghdr.msg_control = cmsg;
msghdr.msg_controllen = cmsg_len;
msghdr.msg_flags = 0;
ret = recvmsg(sock, &msghdr, 0);
if (ret < 0) {
SYSERR("recvmsg failed");
return -errno;
}
*fd = *fds;
return ret;
}
int snd_is_local(struct hostent *hent)
{
int s;
int err;
struct ifconf conf;
size_t numreqs = 10;
size_t i;
struct in_addr *haddr = (struct in_addr*) hent->h_addr_list[0];
s = socket(PF_INET, SOCK_STREAM, 0);
if (s < 0) {
SYSERR("socket failed");
return -errno;
}
conf.ifc_len = numreqs * sizeof(struct ifreq);
conf.ifc_buf = malloc((unsigned int) conf.ifc_len);
if (! conf.ifc_buf)
return -ENOMEM;
while (1) {
err = ioctl(s, SIOCGIFCONF, &conf);
if (err < 0) {
SYSERR("SIOCGIFCONF failed");
return -errno;
}
if ((size_t)conf.ifc_len < numreqs * sizeof(struct ifreq))
break;
numreqs *= 2;
conf.ifc_len = numreqs * sizeof(struct ifreq);
conf.ifc_buf = realloc(conf.ifc_buf, (unsigned int) conf.ifc_len);
if (! conf.ifc_buf)
return -ENOMEM;
}
numreqs = conf.ifc_len / sizeof(struct ifreq);
for (i = 0; i < numreqs; ++i) {
struct ifreq *req = &conf.ifc_req[i];
struct sockaddr_in *s_in = (struct sockaddr_in *)&req->ifr_addr;
s_in->sin_family = AF_INET;
err = ioctl(s, SIOCGIFADDR, req);
if (err < 0)
continue;
if (haddr->s_addr == s_in->sin_addr.s_addr)
break;
}
close(s);
free(conf.ifc_buf);
return i < numreqs;
}
#endif
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