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Annotation of src/usr.bin/ssh/monitor_fdpass.c, Revision 1.7

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:
                     28: #include <sys/uio.h>
                     29:
                     30: #include "log.h"
                     31: #include "monitor_fdpass.h"
                     32:
                     33: void
1.5       avsm       34: mm_send_fd(int sock, int fd)
1.1       provos     35: {
                     36:        struct msghdr msg;
                     37:        char tmp[CMSG_SPACE(sizeof(int))];
                     38:        struct cmsghdr *cmsg;
                     39:        struct iovec vec;
1.2       stevesk    40:        char ch = '\0';
1.4       deraadt    41:        ssize_t n;
1.1       provos     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:
1.5       avsm       57:        if ((n = sendmsg(sock, &msg, 0)) == -1)
1.3       markus     58:                fatal("%s: sendmsg(%d): %s", __func__, fd,
1.2       stevesk    59:                    strerror(errno));
                     60:        if (n != 1)
1.4       deraadt    61:                fatal("%s: sendmsg: expected sent 1 got %ld",
                     62:                    __func__, (long)n);
1.1       provos     63: }
                     64:
                     65: int
1.5       avsm       66: mm_receive_fd(int sock)
1.1       provos     67: {
                     68:        struct msghdr msg;
                     69:        char tmp[CMSG_SPACE(sizeof(int))];
                     70:        struct cmsghdr *cmsg;
                     71:        struct iovec vec;
1.4       deraadt    72:        ssize_t n;
1.1       provos     73:        char ch;
1.4       deraadt    74:        int fd;
1.1       provos     75:
                     76:        memset(&msg, 0, sizeof(msg));
                     77:        vec.iov_base = &ch;
                     78:        vec.iov_len = 1;
                     79:        msg.msg_iov = &vec;
                     80:        msg.msg_iovlen = 1;
                     81:        msg.msg_control = tmp;
                     82:        msg.msg_controllen = sizeof(tmp);
                     83:
1.5       avsm       84:        if ((n = recvmsg(sock, &msg, 0)) == -1)
1.3       markus     85:                fatal("%s: recvmsg: %s", __func__, strerror(errno));
1.2       stevesk    86:        if (n != 1)
1.4       deraadt    87:                fatal("%s: recvmsg: expected received 1 got %ld",
                     88:                    __func__, (long)n);
1.1       provos     89:
                     90:        cmsg = CMSG_FIRSTHDR(&msg);
1.6       djm        91:        if (cmsg == NULL)
                     92:                fatal("%s: no message header", __func__);
1.1       provos     93:        if (cmsg->cmsg_type != SCM_RIGHTS)
1.3       markus     94:                fatal("%s: expected type %d got %d", __func__,
1.1       provos     95:                    SCM_RIGHTS, cmsg->cmsg_type);
1.2       stevesk    96:        fd = (*(int *)CMSG_DATA(cmsg));
                     97:        return fd;
1.1       provos     98: }