lib/krb5/store_sock.c

   1 /*
   2  * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
   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 "krb5_locl.h"
  35 #include "store-int.h"
  36
  37 #ifdef _WIN32
  38 #include <winsock2.h>
  39 #endif
  40
  41 typedef struct socket_storage {
  42     krb5_socket_t sock;
  43 } socket_storage;
  44
  45 #define SOCK(S) (((socket_storage*)(S)->data)->sock)
  46
  47 static ssize_t
  48 socket_fetch(krb5_storage * sp, void *data, size_t size)
  49 {
  50     return net_read(SOCK(sp), data, size);
  51 }
  52
  53 static ssize_t
  54 socket_store(krb5_storage * sp, const void *data, size_t size)
  55 {
  56     return net_write(SOCK(sp), data, size);
  57 }
  58
  59 static off_t
  60 socket_seek(krb5_storage * sp, off_t offset, int whence)
  61 {
  62     return lseek(SOCK(sp), offset, whence);
  63 }
  64
  65 static int
  66 socket_trunc(krb5_storage * sp, off_t offset)
  67 {
  68     if (ftruncate(SOCK(sp), offset) == -1)
  69         return errno;
  70     return 0;
  71 }
  72
  73 static int
  74 socket_sync(krb5_storage * sp)
  75 {
  76     if (fsync(SOCK(sp)) == -1)
  77         return errno;
  78     return 0;
  79 }
  80
  81 static void
  82 socket_free(krb5_storage * sp)
  83 {
  84     rk_closesocket(SOCK(sp));
  85 }
  86
  87 /**
  88  *
  89  *
  90  * @return A krb5_storage on success, or NULL on out of memory error.
  91  *
  92  * @ingroup krb5_storage
  93  *
  94  * @sa krb5_storage_emem()
  95  * @sa krb5_storage_from_mem()
  96  * @sa krb5_storage_from_readonly_mem()
  97  * @sa krb5_storage_from_data()
  98  * @sa krb5_storage_from_fd()
  99  */
 100
 101 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
 102 krb5_storage_from_socket(krb5_socket_t sock_in)
 103 {
 104     krb5_storage *sp;
 105     int saved_errno;
 106     krb5_socket_t sock;
 107
 108 #ifdef _WIN32
 109     WSAPROTOCOL_INFO info;
 110
 111     if (WSADuplicateSocket(sock_in, GetCurrentProcessId(), &info) == 0)
 112     {
 113
 114         sock = WSASocket( FROM_PROTOCOL_INFO,
 115                           FROM_PROTOCOL_INFO,
 116                           FROM_PROTOCOL_INFO,
 117                           &info, 0, 0);
 118     }
 119 #else
 120     sock = dup(sock_in);
 121 #endif
 122
 123     if (sock == rk_INVALID_SOCKET)
 124         return NULL;
 125
 126     errno = ENOMEM;
 127     sp = malloc(sizeof(krb5_storage));
 128     if (sp == NULL) {
 129         saved_errno = errno;
 130         rk_closesocket(sock);
 131         errno = saved_errno;
 132         return NULL;
 133     }
 134
 135     errno = ENOMEM;
 136     sp->data = malloc(sizeof(socket_storage));
 137     if (sp->data == NULL) {
 138         saved_errno = errno;
 139         rk_closesocket(sock);
 140         free(sp);
 141         errno = saved_errno;
 142         return NULL;
 143     }
 144     sp->flags = 0;
 145     sp->eof_code = HEIM_ERR_EOF;
 146     SOCK(sp) = sock;
 147     sp->fetch = socket_fetch;
 148     sp->store = socket_store;
 149     sp->seek = socket_seek;
 150     sp->trunc = socket_trunc;
 151     sp->fsync = socket_sync;
 152     sp->free = socket_free;
 153     sp->max_alloc = UINT_MAX/8;
 154     return sp;
 155 }