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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "error/s2n_errno.h"
#include "stuffer/s2n_stuffer.h"
#include "utils/s2n_safety.h"
int s2n_stuffer_recv_from_fd(struct s2n_stuffer *stuffer, const int rfd, const uint32_t len, uint32_t *bytes_written)
{
POSIX_PRECONDITION(s2n_stuffer_validate(stuffer));
/* Make sure we have enough space to write */
POSIX_GUARD(s2n_stuffer_skip_write(stuffer, len));
/* "undo" the skip write */
stuffer->write_cursor -= len;
ssize_t r = 0;
do {
POSIX_ENSURE(stuffer->blob.data && (r >= 0 || errno == EINTR), S2N_ERR_READ);
r = read(rfd, stuffer->blob.data + stuffer->write_cursor, len);
} while (r < 0);
/* Record just how many bytes we have written */
POSIX_ENSURE(r <= UINT32_MAX, S2N_ERR_INTEGER_OVERFLOW);
POSIX_GUARD(s2n_stuffer_skip_write(stuffer, (uint32_t) r));
if (bytes_written != NULL) {
*bytes_written = r;
}
return S2N_SUCCESS;
}
int s2n_stuffer_send_to_fd(struct s2n_stuffer *stuffer, const int wfd, const uint32_t len, uint32_t *bytes_sent)
{
POSIX_PRECONDITION(s2n_stuffer_validate(stuffer));
/* Make sure we even have the data */
POSIX_GUARD(s2n_stuffer_skip_read(stuffer, len));
/* "undo" the skip read */
stuffer->read_cursor -= len;
ssize_t w = 0;
do {
POSIX_ENSURE(stuffer->blob.data && (w >= 0 || errno == EINTR), S2N_ERR_WRITE);
w = write(wfd, stuffer->blob.data + stuffer->read_cursor, len);
} while (w < 0);
POSIX_ENSURE(w <= UINT32_MAX - stuffer->read_cursor, S2N_ERR_INTEGER_OVERFLOW);
stuffer->read_cursor += w;
if (bytes_sent != NULL) {
*bytes_sent = w;
}
return S2N_SUCCESS;
}
int s2n_stuffer_alloc_ro_from_fd(struct s2n_stuffer *stuffer, int rfd)
{
POSIX_ENSURE_MUT(stuffer);
struct stat st = { 0 };
POSIX_ENSURE(fstat(rfd, &st) >= 0, S2N_ERR_FSTAT);
POSIX_ENSURE_GT(st.st_size, 0);
POSIX_ENSURE_LTE(st.st_size, UINT32_MAX);
uint8_t *map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, rfd, 0);
POSIX_ENSURE(map != MAP_FAILED, S2N_ERR_MMAP);
struct s2n_blob b = { 0 };
POSIX_GUARD(s2n_blob_init(&b, map, (uint32_t) st.st_size));
return s2n_stuffer_init(stuffer, &b);
}
int s2n_stuffer_alloc_ro_from_file(struct s2n_stuffer *stuffer, const char *file)
{
POSIX_ENSURE_MUT(stuffer);
POSIX_ENSURE_REF(file);
int fd;
do {
fd = open(file, O_RDONLY);
POSIX_ENSURE(fd >= 0 || errno == EINTR, S2N_ERR_OPEN);
} while (fd < 0);
int r = s2n_stuffer_alloc_ro_from_fd(stuffer, fd);
POSIX_GUARD(close(fd));
return r;
}
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