/crypto/heimdal/lib/roken/sendmsg.c

  1/*
  2 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Hรถgskolan
  3 * (Royal Institute of Technology, Stockholm, Sweden).
  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 *
 10 * 1. Redistributions of source code must retain the above copyright
 11 *    notice, this list of conditions and the following disclaimer.
 12 *
 13 * 2. Redistributions in binary form must reproduce the above copyright
 14 *    notice, this list of conditions and the following disclaimer in the
 15 *    documentation and/or other materials provided with the distribution.
 16 *
 17 * 3. Neither the name of the Institute nor the names of its contributors
 18 *    may be used to endorse or promote products derived from this software
 19 *    without specific prior written permission.
 20 *
 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 31 * SUCH DAMAGE.
 32 */
 33
 34#include <config.h>
 35
 36#include "roken.h"
 37
 38#ifndef _WIN32
 39
 40ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
 41sendmsg(rk_socket_t s, const struct msghdr *msg, int flags)
 42{
 43    ssize_t ret;
 44    size_t tot = 0;
 45    int i;
 46    char *buf, *p;
 47    struct iovec *iov = msg->msg_iov;
 48
 49    for(i = 0; i < msg->msg_iovlen; ++i)
 50	tot += iov[i].iov_len;
 51    buf = malloc(tot);
 52    if (tot != 0 && buf == NULL) {
 53	errno = ENOMEM;
 54	return -1;
 55    }
 56    p = buf;
 57    for (i = 0; i < msg->msg_iovlen; ++i) {
 58	memcpy (p, iov[i].iov_base, iov[i].iov_len);
 59	p += iov[i].iov_len;
 60    }
 61    ret = sendto (s, buf, tot, flags, msg->msg_name, msg->msg_namelen);
 62    free (buf);
 63    return ret;
 64}
 65
 66#else /* _WIN32 */
 67
 68/***********************************************************************
 69 * Copyright (c) 2009, Secure Endpoints Inc.
 70 * All rights reserved.
 71 *
 72 * Redistribution and use in source and binary forms, with or without
 73 * modification, are permitted provided that the following conditions
 74 * are met:
 75 *
 76 * - Redistributions of source code must retain the above copyright
 77 *   notice, this list of conditions and the following disclaimer.
 78 *
 79 * - Redistributions in binary form must reproduce the above copyright
 80 *   notice, this list of conditions and the following disclaimer in
 81 *   the documentation and/or other materials provided with the
 82 *   distribution.
 83 *
 84 * - Neither the name of Secure Endpoints Inc. nor the names of its
 85 *   contributors may be used to endorse or promote products derived
 86 *   from this software without specific prior written permission.
 87 *
 88 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 89 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 90 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 91 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 92 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 93 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 94 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 95 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 96 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 97 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 98 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 99 * OF THE POSSIBILITY OF SUCH DAMAGE.
100 *
101 **********************************************************************/
102
103/**
104 * Implementation of sendmsg() for WIN32
105 *
106 * We are using a contrived definition of msghdr which actually uses
107 * an array of ::_WSABUF structures instead of ::iovec .  This allows
108 * us to call WSASend directly using the given ::msghdr instead of
109 * having to allocate another array of ::_WSABUF and copying data for
110 * each call.
111 *
112 * Limitations:
113 *
114 * - msg->msg_name is ignored.  So is msg->control.
115 * - WSASend() only supports ::MSG_DONTROUTE, ::MSG_OOB and
116 *   ::MSG_PARTIAL.
117 *
118 * @param[in] s The socket to use.
119 * @param[in] msg The message
120 * @param[in] flags Flags.  A combination of ::MSG_DONTROUTE,
121 *  ::MSG_OOB and ::MSG_PARTIAL
122 *
123 * @return The number of bytes sent, on success.  Or -1 on error.
124 */
125ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
126sendmsg_w32(rk_socket_t s, const struct msghdr * msg, int flags)
127{
128    int srv;
129    DWORD num_bytes_sent = 0;
130
131    /* TODO: For _WIN32_WINNT >= 0x0600 we can use WSASendMsg using
132       WSAMSG which is a much more direct analogue to sendmsg(). */
133
134    srv = WSASend(s, msg->msg_iov, msg->msg_iovlen,
135		  &num_bytes_sent, flags, NULL, NULL);
136
137    if (srv == 0)
138	return (int) num_bytes_sent;
139
140    /* srv == SOCKET_ERROR and WSAGetLastError() == WSA_IO_PENDING
141       indicates that a non-blocking transfer has been scheduled.
142       We'll have to check for that if we ever support non-blocking
143       I/O. */
144
145    return -1;
146}
147
148#endif /* !_WIN32 */