1 /* $NetBSD: store_fd.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "krb5_locl.h" 37 #include "store-int.h" 38 39 typedef struct fd_storage { 40 int fd; 41 } fd_storage; 42 43 #define FD(S) (((fd_storage*)(S)->data)->fd) 44 45 static ssize_t 46 fd_fetch(krb5_storage * sp, void *data, size_t size) 47 { 48 return net_read(FD(sp), data, size); 49 } 50 51 static ssize_t 52 fd_store(krb5_storage * sp, const void *data, size_t size) 53 { 54 return net_write(FD(sp), data, size); 55 } 56 57 static off_t 58 fd_seek(krb5_storage * sp, off_t offset, int whence) 59 { 60 return lseek(FD(sp), offset, whence); 61 } 62 63 static int 64 fd_trunc(krb5_storage * sp, off_t offset) 65 { 66 if (ftruncate(FD(sp), offset) == -1) 67 return errno; 68 return 0; 69 } 70 71 static void 72 fd_free(krb5_storage * sp) 73 { 74 close(FD(sp)); 75 } 76 77 /** 78 * 79 * 80 * @return A krb5_storage on success, or NULL on out of memory error. 81 * 82 * @ingroup krb5_storage 83 * 84 * @sa krb5_storage_emem() 85 * @sa krb5_storage_from_mem() 86 * @sa krb5_storage_from_readonly_mem() 87 * @sa krb5_storage_from_data() 88 */ 89 90 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL 91 krb5_storage_from_fd(krb5_socket_t fd_in) 92 { 93 krb5_storage *sp; 94 int fd; 95 96 #ifdef SOCKET_IS_NOT_AN_FD 97 #ifdef _MSC_VER 98 if (_get_osfhandle(fd_in) != -1) { 99 fd = dup(fd_in); 100 } else { 101 fd = _open_osfhandle(fd_in, 0); 102 } 103 #else 104 #error Dont know how to deal with fd that may or may not be a socket. 105 #endif 106 #else /* SOCKET_IS_NOT_AN_FD */ 107 fd = dup(fd_in); 108 #endif 109 110 if (fd < 0) 111 return NULL; 112 113 sp = malloc(sizeof(krb5_storage)); 114 if (sp == NULL) { 115 close(fd); 116 return NULL; 117 } 118 119 sp->data = malloc(sizeof(fd_storage)); 120 if (sp->data == NULL) { 121 close(fd); 122 free(sp); 123 return NULL; 124 } 125 sp->flags = 0; 126 sp->eof_code = HEIM_ERR_EOF; 127 FD(sp) = fd; 128 sp->fetch = fd_fetch; 129 sp->store = fd_store; 130 sp->seek = fd_seek; 131 sp->trunc = fd_trunc; 132 sp->free = fd_free; 133 sp->max_alloc = UINT_MAX/8; 134 return sp; 135 } 136