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Annotation of src/usr.bin/ssh/msg.c, Revision 1.16

1.16    ! djm         1: /* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2002 Markus Friedl.  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:  */
1.12      stevesk    25:
1.13      stevesk    26: #include <sys/types.h>
1.15      deraadt    27: #include <sys/uio.h>
1.13      stevesk    28:
1.12      stevesk    29: #include <errno.h>
1.15      deraadt    30: #include <stdio.h>
1.14      stevesk    31: #include <string.h>
1.13      stevesk    32: #include <unistd.h>
1.15      deraadt    33: #include <stdarg.h>
1.1       markus     34:
1.16    ! djm        35: #include "sshbuf.h"
        !            36: #include "ssherr.h"
1.1       markus     37: #include "log.h"
                     38: #include "atomicio.h"
                     39: #include "msg.h"
1.11      djm        40: #include "misc.h"
1.1       markus     41:
1.7       djm        42: int
1.16    ! djm        43: ssh_msg_send(int fd, u_char type, struct sshbuf *m)
1.1       markus     44: {
                     45:        u_char buf[5];
1.16    ! djm        46:        u_int mlen = sshbuf_len(m);
1.1       markus     47:
1.5       djm        48:        debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
1.1       markus     49:
1.11      djm        50:        put_u32(buf, mlen + 1);
1.2       deraadt    51:        buf[4] = type;          /* 1st byte of payload is mesg-type */
1.7       djm        52:        if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     53:                error("ssh_msg_send: write");
                     54:                return (-1);
                     55:        }
1.16    ! djm        56:        if (atomicio(vwrite, fd, (u_char *)sshbuf_ptr(m), mlen) != mlen) {
1.7       djm        57:                error("ssh_msg_send: write");
                     58:                return (-1);
                     59:        }
                     60:        return (0);
1.1       markus     61: }
                     62:
                     63: int
1.16    ! djm        64: ssh_msg_recv(int fd, struct sshbuf *m)
1.1       markus     65: {
1.16    ! djm        66:        u_char buf[4], *p;
1.1       markus     67:        u_int msg_len;
1.16    ! djm        68:        int r;
1.1       markus     69:
1.5       djm        70:        debug3("ssh_msg_recv entering");
1.1       markus     71:
1.8       avsm       72:        if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     73:                if (errno != EPIPE)
                     74:                        error("ssh_msg_recv: read: header");
1.7       djm        75:                return (-1);
1.1       markus     76:        }
1.11      djm        77:        msg_len = get_u32(buf);
1.7       djm        78:        if (msg_len > 256 * 1024) {
                     79:                error("ssh_msg_recv: read: bad msg_len %u", msg_len);
                     80:                return (-1);
                     81:        }
1.16    ! djm        82:        sshbuf_reset(m);
        !            83:        if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) {
        !            84:                error("%s: buffer error: %s", __func__, ssh_err(r));
        !            85:                return -1;
        !            86:        }
        !            87:        if (atomicio(read, fd, p, msg_len) != msg_len) {
1.8       avsm       88:                error("ssh_msg_recv: read: %s", strerror(errno));
1.7       djm        89:                return (-1);
                     90:        }
                     91:        return (0);
1.1       markus     92: }