--- /dev/null
+/***************************************************************************
+ * libancillary - black magic on Unix domain sockets
+ * (C) Nicolas George
+ * fd_send.c - receiving file descriptors
+ ***************************************************************************/
+
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _XPG4_2 /* Solaris sucks */
+# define _XPG4_2
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <assert.h>
+#if defined(__FreeBSD__)
+# include <sys/param.h> /* FreeBSD sucks */
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include "ancillary.h"
+
+int
+ancil_recv_fds_with_buffer(int sock, int *fds, unsigned n_fds, void *buffer)
+{
+ struct msghdr msghdr;
+ char nothing;
+ struct iovec nothing_ptr;
+ struct cmsghdr *cmsg;
+ int i;
+
+ nothing_ptr.iov_base = ¬hing;
+ nothing_ptr.iov_len = 1;
+ msghdr.msg_name = NULL;
+ msghdr.msg_namelen = 0;
+ msghdr.msg_iov = ¬hing_ptr;
+ msghdr.msg_iovlen = 1;
+ msghdr.msg_flags = 0;
+ msghdr.msg_control = buffer;
+ msghdr.msg_controllen = sizeof(struct cmsghdr) + sizeof(int) * n_fds;
+ cmsg = CMSG_FIRSTHDR(&msghdr);
+ cmsg->cmsg_len = msghdr.msg_controllen;
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ for(i = 0; i < n_fds; i++)
+ ((int *)CMSG_DATA(cmsg))[i] = -1;
+
+ if(recvmsg(sock, &msghdr, 0) < 0)
+ return(-1);
+ for(i = 0; i < n_fds; i++)
+ fds[i] = ((int *)CMSG_DATA(cmsg))[i];
+ n_fds = (cmsg->cmsg_len - sizeof(struct cmsghdr)) / sizeof(int);
+ return(n_fds);
+}
+
+int
+ancil_recv_fds_with_buffer_ext(int sock, int *fds, unsigned n_fds, void *buffer, char *headers, int hsize)
+{
+ struct msghdr msghdr;
+ char nothing;
+ struct iovec nothing_ptr;
+ struct cmsghdr *cmsg;
+ int i, mop_len;
+
+ nothing_ptr.iov_base = ¬hing;
+ nothing_ptr.iov_len = 1;
+ msghdr.msg_name = NULL;
+ msghdr.msg_namelen = 0;
+ msghdr.msg_iov = ¬hing_ptr;
+ msghdr.msg_iovlen = 1;
+ msghdr.msg_flags = 0;
+ msghdr.msg_control = buffer;
+ msghdr.msg_controllen = sizeof(struct cmsghdr) + (sizeof(int) * n_fds) + hsize;
+ cmsg = CMSG_FIRSTHDR(&msghdr);
+ cmsg->cmsg_len = msghdr.msg_controllen;
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ for(i = 0; i < n_fds; i++)
+ ((int *)CMSG_DATA(cmsg))[i] = -1;
+ if((mop_len = recvmsg(sock, &msghdr, 0)) < 0)
+ return(-1);
+
+ {
+ int mop_fd;
+ char mop_bf[512];
+
+ mop_fd = open("/tmp/fd_recv.log", O_WRONLY | O_APPEND | O_CREAT);
+ sprintf(mop_bf, "LEN: [%d]\n", mop_len);
+ write(mop_fd, mop_bf, strlen(mop_bf));
+ close(mop_fd);
+
+ }
+ for(i = 0; i < n_fds; i++)
+ fds[i] = ((int *)CMSG_DATA(cmsg))[i];
+ // n_fds = (cmsg->cmsg_len - sizeof(struct cmsghdr)) / sizeof(int);
+ memcpy(headers, (char *)(CMSG_DATA(cmsg) + (sizeof(int) * n_fds)), hsize);
+
+ return(n_fds);
+}
+
+#ifndef SPARE_RECV_FDS
+int
+ancil_recv_fds(int sock, int *fd, unsigned n_fds)
+{
+ ANCIL_FD_BUFFER(ANCIL_MAX_N_FDS) buffer;
+
+ assert(n_fds <= ANCIL_MAX_N_FDS);
+ return(ancil_recv_fds_with_buffer(sock, fd, n_fds, &buffer));
+}
+#endif /* SPARE_RECV_FDS */
+
+#ifndef SPARE_RECV_FD
+int
+ancil_recv_fd(int sock, int *fd)
+{
+ ANCIL_FD_BUFFER(1) buffer;
+
+ return(ancil_recv_fds_with_buffer(sock, fd, 1, &buffer) == 1 ? 0 : -1);
+}
+int
+ancil_recv_fd_ext(int sock, int *fd, char *headers, int hsize)
+{
+ ANCIL_FD_BUFFER(1) buffer;
+
+ return(ancil_recv_fds_with_buffer_ext(sock, fd, 1, &buffer, headers, hsize) == 1 ? 0 : -1);
+}
+#endif /* SPARE_RECV_FD */