+/* $OpenBSD: monitor_fdpass.c,v 1.19 2010/01/12 00:58:25 djm Exp $ */
/*
* Copyright 2001 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*/
#include "includes.h"
-RCSID("$OpenBSD: monitor_fdpass.c,v 1.2 2002/03/24 17:53:16 stevesk Exp $");
+#include <sys/types.h>
+#include <sys/socket.h>
#include <sys/uio.h>
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+
+#include <errno.h>
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
+#include <string.h>
+#include <stdarg.h>
#include "log.h"
#include "monitor_fdpass.h"
-void
-mm_send_fd(int socket, int fd)
+int
+mm_send_fd(int sock, int fd)
{
#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
struct msghdr msg;
- struct iovec vec;
- char ch = '\0';
- int n;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
- char tmp[CMSG_SPACE(sizeof(int))];
+ union {
+ struct cmsghdr hdr;
+ char buf[CMSG_SPACE(sizeof(int))];
+ } cmsgbuf;
struct cmsghdr *cmsg;
#endif
+ struct iovec vec;
+ char ch = '\0';
+ ssize_t n;
+ struct pollfd pfd;
memset(&msg, 0, sizeof(msg));
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
msg.msg_accrights = (caddr_t)&fd;
msg.msg_accrightslen = sizeof(fd);
#else
- msg.msg_control = (caddr_t)tmp;
- msg.msg_controllen = CMSG_LEN(sizeof(int));
+ msg.msg_control = (caddr_t)&cmsgbuf.buf;
+ msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
- if ((n = sendmsg(socket, &msg, 0)) == -1)
- fatal("%s: sendmsg(%d): %s", __FUNCTION__, fd,
+ pfd.fd = sock;
+ pfd.events = POLLOUT;
+ while ((n = sendmsg(sock, &msg, 0)) == -1 &&
+ (errno == EAGAIN || errno == EINTR)) {
+ debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno));
+ (void)poll(&pfd, 1, -1);
+ }
+ if (n == -1) {
+ error("%s: sendmsg(%d): %s", __func__, fd,
strerror(errno));
- if (n != 1)
- fatal("%s: sendmsg: expected sent 1 got %d",
- __FUNCTION__, n);
+ return -1;
+ }
+
+ if (n != 1) {
+ error("%s: sendmsg: expected sent 1 got %ld",
+ __func__, (long)n);
+ return -1;
+ }
+ return 0;
#else
- fatal("%s: UsePrivilegeSeparation=yes not supported",
- __FUNCTION__);
+ error("%s: file descriptor passing not supported", __func__);
+ return -1;
#endif
}
int
-mm_receive_fd(int socket)
+mm_receive_fd(int sock)
{
#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
struct msghdr msg;
- struct iovec vec;
- char ch;
- int fd, n;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
- char tmp[CMSG_SPACE(sizeof(int))];
+ union {
+ struct cmsghdr hdr;
+ char buf[CMSG_SPACE(sizeof(int))];
+ } cmsgbuf;
struct cmsghdr *cmsg;
#endif
+ struct iovec vec;
+ ssize_t n;
+ char ch;
+ int fd;
+ struct pollfd pfd;
memset(&msg, 0, sizeof(msg));
vec.iov_base = &ch;
msg.msg_accrights = (caddr_t)&fd;
msg.msg_accrightslen = sizeof(fd);
#else
- msg.msg_control = tmp;
- msg.msg_controllen = sizeof(tmp);
+ msg.msg_control = &cmsgbuf.buf;
+ msg.msg_controllen = sizeof(cmsgbuf.buf);
#endif
- if ((n = recvmsg(socket, &msg, 0)) == -1)
- fatal("%s: recvmsg: %s", __FUNCTION__, strerror(errno));
- if (n != 1)
- fatal("%s: recvmsg: expected received 1 got %d",
- __FUNCTION__, n);
+ pfd.fd = sock;
+ pfd.events = POLLIN;
+ while ((n = recvmsg(sock, &msg, 0)) == -1 &&
+ (errno == EAGAIN || errno == EINTR)) {
+ debug3("%s: recvmsg: %s", __func__, strerror(errno));
+ (void)poll(&pfd, 1, -1);
+ }
+ if (n == -1) {
+ error("%s: recvmsg: %s", __func__, strerror(errno));
+ return -1;
+ }
+
+ if (n != 1) {
+ error("%s: recvmsg: expected received 1 got %ld",
+ __func__, (long)n);
+ return -1;
+ }
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
- if (msg.msg_accrightslen != sizeof(fd))
- fatal("%s: no fd", __FUNCTION__);
+ if (msg.msg_accrightslen != sizeof(fd)) {
+ error("%s: no fd", __func__);
+ return -1;
+ }
#else
cmsg = CMSG_FIRSTHDR(&msg);
- if (cmsg->cmsg_type != SCM_RIGHTS)
- fatal("%s: expected type %d got %d", __FUNCTION__,
+ if (cmsg == NULL) {
+ error("%s: no message header", __func__);
+ return -1;
+ }
+
+#ifndef BROKEN_CMSG_TYPE
+ if (cmsg->cmsg_type != SCM_RIGHTS) {
+ error("%s: expected type %d got %d", __func__,
SCM_RIGHTS, cmsg->cmsg_type);
+ return -1;
+ }
+#endif
fd = (*(int *)CMSG_DATA(cmsg));
#endif
return fd;
#else
- fatal("%s: UsePrivilegeSeparation=yes not supported",
- __FUNCTION__);
+ error("%s: file descriptor passing not supported", __func__);
+ return -1;
#endif
}