99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
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/***************************************************************************
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* libancillary - black magic on Unix domain sockets
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* (C) Nicolas George
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* fd_send.c - receiving file descriptors
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***************************************************************************/
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/*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _XPG4_2 /* Solaris sucks */
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# define _XPG4_2
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#endif
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <assert.h>
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#if defined(__FreeBSD__)
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# include <sys/param.h> /* FreeBSD sucks */
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#endif
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#include "ancillary.h"
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int
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ancil_recv_fds_with_buffer(int sock, int *fds, unsigned n_fds, void *buffer)
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{
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struct msghdr msghdr;
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char nothing;
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struct iovec nothing_ptr;
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struct cmsghdr *cmsg;
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int i;
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nothing_ptr.iov_base = ¬hing;
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nothing_ptr.iov_len = 1;
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = ¬hing_ptr;
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msghdr.msg_iovlen = 1;
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msghdr.msg_flags = 0;
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msghdr.msg_control = buffer;
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msghdr.msg_controllen = sizeof(struct cmsghdr) + sizeof(int) * n_fds;
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cmsg = CMSG_FIRSTHDR(&msghdr);
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cmsg->cmsg_len = msghdr.msg_controllen;
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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for(i = 0; i < n_fds; i++)
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((int *)CMSG_DATA(cmsg))[i] = -1;
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if(recvmsg(sock, &msghdr, 0) < 0)
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return(-1);
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for(i = 0; i < n_fds; i++)
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fds[i] = ((int *)CMSG_DATA(cmsg))[i];
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n_fds = (msghdr.msg_controllen - sizeof(struct cmsghdr)) / sizeof(int);
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return(n_fds);
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}
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#ifndef SPARE_RECV_FDS
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int
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ancil_recv_fds(int sock, int *fd, unsigned n_fds)
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{
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ANCIL_FD_BUFFER(ANCIL_MAX_N_FDS) buffer;
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assert(n_fds <= ANCIL_MAX_N_FDS);
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return(ancil_recv_fds_with_buffer(sock, fd, n_fds, &buffer));
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}
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#endif /* SPARE_RECV_FDS */
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#ifndef SPARE_RECV_FD
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int
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ancil_recv_fd(int sock, int *fd)
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{
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ANCIL_FD_BUFFER(1) buffer;
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return(ancil_recv_fds_with_buffer(sock, fd, 1, &buffer) == 1 ? 0 : -1);
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}
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#endif /* SPARE_RECV_FD */
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