diff options
Diffstat (limited to 'third_party/heimdal/lib/krb5/store_fd.c')
| -rw-r--r-- | third_party/heimdal/lib/krb5/store_fd.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/store_fd.c b/third_party/heimdal/lib/krb5/store_fd.c new file mode 100644 index 00000000000..720ed66f75b --- /dev/null +++ b/third_party/heimdal/lib/krb5/store_fd.c @@ -0,0 +1,200 @@ +/* + * Copyright (c) 1997 - 2017 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "krb5_locl.h" +#include "store-int.h" + +typedef struct fd_storage { + int fd; +} fd_storage; + +#define FD(S) (((fd_storage*)(S)->data)->fd) + +static ssize_t +fd_fetch(krb5_storage * sp, void *data, size_t size) +{ + char *cbuf = (char *)data; + ssize_t count; + size_t rem = size; + + /* similar pattern to net_read() to support pipes */ + while (rem > 0) { + count = read (FD(sp), cbuf, rem); + if (count < 0) { + if (errno == EINTR) + continue; + else if (rem == size) + return count; + else + return size - rem; + } else if (count == 0) { + return count; + } + cbuf += count; + rem -= count; + } + return size; +} + +static ssize_t +fd_store(krb5_storage * sp, const void *data, size_t size) +{ + const char *cbuf = (const char *)data; + ssize_t count; + size_t rem = size; + + /* similar pattern to net_write() to support pipes */ + while (rem > 0) { + count = write(FD(sp), cbuf, rem); + if (count < 0) { + if (errno == EINTR) + continue; + else + return size - rem; + } + cbuf += count; + rem -= count; + } + return size; +} + +static off_t +fd_seek(krb5_storage * sp, off_t offset, int whence) +{ + return lseek(FD(sp), offset, whence); +} + +static int +fd_trunc(krb5_storage * sp, off_t offset) +{ + off_t tmpoff; + + if (ftruncate(FD(sp), offset) == -1) + return errno; + + tmpoff = lseek(FD(sp), 0, SEEK_CUR); + if (tmpoff == -1) + return errno; + + if (tmpoff > offset) { + tmpoff = lseek(FD(sp), offset, SEEK_SET); + if (tmpoff == -1) + return errno; + } + + return 0; +} + +static int +fd_sync(krb5_storage * sp) +{ + if (fsync(FD(sp)) == -1) + return errno; + return 0; +} + +static void +fd_free(krb5_storage * sp) +{ + int save_errno = errno; + if (close(FD(sp)) == 0) + errno = save_errno; +} + +/** + * + * + * @return A krb5_storage on success, or NULL on out of memory error. + * + * @ingroup krb5_storage + * + * @sa krb5_storage_emem() + * @sa krb5_storage_from_mem() + * @sa krb5_storage_from_readonly_mem() + * @sa krb5_storage_from_data() + * @sa krb5_storage_from_socket() + */ + +KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL +krb5_storage_from_fd(int fd_in) +{ + krb5_storage *sp; + int saved_errno; + int fd; + +#ifdef _MSC_VER + /* + * This function used to try to pass the input to + * _get_osfhandle() to test if the value is a HANDLE + * but this doesn't work because doing so throws an + * exception that will result in Watson being triggered + * to file a Windows Error Report. + */ + fd = _dup(fd_in); +#else + fd = dup(fd_in); +#endif + + if (fd < 0) + return NULL; + + errno = ENOMEM; + sp = malloc(sizeof(krb5_storage)); + if (sp == NULL) { + saved_errno = errno; + close(fd); + errno = saved_errno; + return NULL; + } + + errno = ENOMEM; + sp->data = malloc(sizeof(fd_storage)); + if (sp->data == NULL) { + saved_errno = errno; + close(fd); + free(sp); + errno = saved_errno; + return NULL; + } + sp->flags = 0; + sp->eof_code = HEIM_ERR_EOF; + FD(sp) = fd; + sp->fetch = fd_fetch; + sp->store = fd_store; + sp->seek = fd_seek; + sp->trunc = fd_trunc; + sp->fsync = fd_sync; + sp->free = fd_free; + sp->max_alloc = UINT_MAX/8; + return sp; +} |