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Annotation of src/usr.bin/ssh/monitor_fdpass.c, Revision 1.17

1.17    ! deraadt     1: /* $OpenBSD: monitor_fdpass.c,v 1.16 2008/03/15 16:19:02 deraadt Exp $ */
1.1       provos      2: /*
                      3:  * Copyright 2001 Niels Provos <provos@citi.umich.edu>
                      4:  * All rights reserved.
                      5:  *
                      6:  * Redistribution and use in source and binary forms, with or without
                      7:  * modification, are permitted provided that the following conditions
                      8:  * are met:
                      9:  * 1. Redistributions of source code must retain the above copyright
                     10:  *    notice, this list of conditions and the following disclaimer.
                     11:  * 2. Redistributions in binary form must reproduce the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer in the
                     13:  *    documentation and/or other materials provided with the distribution.
                     14:  *
                     15:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     17:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     18:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     19:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     20:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     21:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     22:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     23:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     24:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     25:  */
                     26:
1.9       stevesk    27: #include <sys/types.h>
                     28: #include <sys/socket.h>
1.1       provos     29: #include <sys/uio.h>
1.10      stevesk    30:
                     31: #include <errno.h>
1.11      stevesk    32: #include <string.h>
1.12      deraadt    33: #include <stdarg.h>
1.1       provos     34:
                     35: #include "log.h"
                     36: #include "monitor_fdpass.h"
                     37:
1.13      djm        38: int
1.5       avsm       39: mm_send_fd(int sock, int fd)
1.1       provos     40: {
                     41:        struct msghdr msg;
1.14      deraadt    42:        union {
                     43:                struct cmsghdr hdr;
1.15      deraadt    44:                char buf[CMSG_SPACE(sizeof(int))];
                     45:        } cmsgbuf;
1.1       provos     46:        struct cmsghdr *cmsg;
                     47:        struct iovec vec;
1.2       stevesk    48:        char ch = '\0';
1.4       deraadt    49:        ssize_t n;
1.1       provos     50:
                     51:        memset(&msg, 0, sizeof(msg));
1.15      deraadt    52:        msg.msg_control = (caddr_t)&cmsgbuf.buf;
1.17    ! deraadt    53:        msg.msg_controllen = sizeof(cmsgbuf.buf);
1.1       provos     54:        cmsg = CMSG_FIRSTHDR(&msg);
                     55:        cmsg->cmsg_len = CMSG_LEN(sizeof(int));
                     56:        cmsg->cmsg_level = SOL_SOCKET;
                     57:        cmsg->cmsg_type = SCM_RIGHTS;
                     58:        *(int *)CMSG_DATA(cmsg) = fd;
                     59:
                     60:        vec.iov_base = &ch;
                     61:        vec.iov_len = 1;
                     62:        msg.msg_iov = &vec;
                     63:        msg.msg_iovlen = 1;
                     64:
1.13      djm        65:        if ((n = sendmsg(sock, &msg, 0)) == -1) {
                     66:                error("%s: sendmsg(%d): %s", __func__, fd,
1.2       stevesk    67:                    strerror(errno));
1.13      djm        68:                return -1;
                     69:        }
                     70:
                     71:        if (n != 1) {
                     72:                error("%s: sendmsg: expected sent 1 got %ld",
1.4       deraadt    73:                    __func__, (long)n);
1.13      djm        74:                return -1;
                     75:        }
                     76:        return 0;
1.1       provos     77: }
                     78:
                     79: int
1.5       avsm       80: mm_receive_fd(int sock)
1.1       provos     81: {
                     82:        struct msghdr msg;
1.14      deraadt    83:        union {
                     84:                struct cmsghdr hdr;
1.15      deraadt    85:                char buf[CMSG_SPACE(sizeof(int))];
                     86:        } cmsgbuf;
1.1       provos     87:        struct cmsghdr *cmsg;
                     88:        struct iovec vec;
1.4       deraadt    89:        ssize_t n;
1.1       provos     90:        char ch;
1.4       deraadt    91:        int fd;
1.1       provos     92:
                     93:        memset(&msg, 0, sizeof(msg));
                     94:        vec.iov_base = &ch;
                     95:        vec.iov_len = 1;
                     96:        msg.msg_iov = &vec;
                     97:        msg.msg_iovlen = 1;
1.15      deraadt    98:        msg.msg_control = &cmsgbuf.buf;
1.17    ! deraadt    99:        msg.msg_controllen = sizeof(cmsgbuf.buf);
1.1       provos    100:
1.13      djm       101:        if ((n = recvmsg(sock, &msg, 0)) == -1) {
                    102:                error("%s: recvmsg: %s", __func__, strerror(errno));
                    103:                return -1;
                    104:        }
                    105:
                    106:        if (n != 1) {
                    107:                error("%s: recvmsg: expected received 1 got %ld",
1.4       deraadt   108:                    __func__, (long)n);
1.13      djm       109:                return -1;
                    110:        }
1.1       provos    111:
                    112:        cmsg = CMSG_FIRSTHDR(&msg);
1.13      djm       113:        if (cmsg == NULL) {
                    114:                error("%s: no message header", __func__);
                    115:                return -1;
                    116:        }
                    117:
                    118:        if (cmsg->cmsg_type != SCM_RIGHTS) {
                    119:                error("%s: expected type %d got %d", __func__,
1.1       provos    120:                    SCM_RIGHTS, cmsg->cmsg_type);
1.13      djm       121:                return -1;
                    122:        }
1.2       stevesk   123:        fd = (*(int *)CMSG_DATA(cmsg));
                    124:        return fd;
1.1       provos    125: }