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Annotation of src/usr.bin/ssh/monitor_fdpass.c, Revision 1.1

1.1     ! provos      1: /*
        !             2:  * Copyright 2001 Niels Provos <provos@citi.umich.edu>
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  *
        !            14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            16:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            17:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            18:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            19:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            20:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            21:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            22:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            23:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            24:  */
        !            25:
        !            26: #include "includes.h"
        !            27: RCSID("$OpenBSD$");
        !            28:
        !            29: #include <sys/uio.h>
        !            30:
        !            31: #include "log.h"
        !            32: #include "monitor_fdpass.h"
        !            33:
        !            34: void
        !            35: mm_send_fd(int socket, int fd)
        !            36: {
        !            37:        struct msghdr msg;
        !            38:        char tmp[CMSG_SPACE(sizeof(int))];
        !            39:        struct cmsghdr *cmsg;
        !            40:        struct iovec vec;
        !            41:        char ch;
        !            42:
        !            43:        memset(&msg, 0, sizeof(msg));
        !            44:        msg.msg_control = (caddr_t)tmp;
        !            45:        msg.msg_controllen = CMSG_LEN(sizeof(int));
        !            46:        cmsg = CMSG_FIRSTHDR(&msg);
        !            47:        cmsg->cmsg_len = CMSG_LEN(sizeof(int));
        !            48:        cmsg->cmsg_level = SOL_SOCKET;
        !            49:        cmsg->cmsg_type = SCM_RIGHTS;
        !            50:        *(int *)CMSG_DATA(cmsg) = fd;
        !            51:
        !            52:        vec.iov_base = &ch;
        !            53:        vec.iov_len = 1;
        !            54:        msg.msg_iov = &vec;
        !            55:        msg.msg_iovlen = 1;
        !            56:
        !            57:        if (sendmsg(socket, &msg, 0) == -1)
        !            58:                fatal("%s: sendmsg(%d)", __FUNCTION__, fd);
        !            59: }
        !            60:
        !            61: int
        !            62: mm_receive_fd(int socket)
        !            63: {
        !            64:        struct msghdr msg;
        !            65:        char tmp[CMSG_SPACE(sizeof(int))];
        !            66:        struct cmsghdr *cmsg;
        !            67:        struct iovec vec;
        !            68:        char ch;
        !            69:
        !            70:        memset(&msg, 0, sizeof(msg));
        !            71:        vec.iov_base = &ch;
        !            72:        vec.iov_len = 1;
        !            73:        msg.msg_iov = &vec;
        !            74:        msg.msg_iovlen = 1;
        !            75:        msg.msg_control = tmp;
        !            76:        msg.msg_controllen = sizeof(tmp);
        !            77:
        !            78:        if (recvmsg(socket, &msg, 0) == -1)
        !            79:                fatal("%s: recvmsg", __FUNCTION__);
        !            80:
        !            81:        cmsg = CMSG_FIRSTHDR(&msg);
        !            82:        if (cmsg->cmsg_type != SCM_RIGHTS)
        !            83:                fatal("%s: expected type %d got %d", __FUNCTION__,
        !            84:                    SCM_RIGHTS, cmsg->cmsg_type);
        !            85:        return (*(int *)CMSG_DATA(cmsg));
        !            86: }