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/* $OpenBSD: io.c,v 1.14 2021/10/22 11:13:06 claudio Exp $ */
/*
* Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <imsg.h>
#include "extern.h"
void
io_socket_blocking(int fd)
{
int fl;
if ((fl = fcntl(fd, F_GETFL, 0)) == -1)
err(1, "fcntl");
if (fcntl(fd, F_SETFL, fl & ~O_NONBLOCK) == -1)
err(1, "fcntl");
}
void
io_socket_nonblocking(int fd)
{
int fl;
if ((fl = fcntl(fd, F_GETFL, 0)) == -1)
err(1, "fcntl");
if (fcntl(fd, F_SETFL, fl | O_NONBLOCK) == -1)
err(1, "fcntl");
}
/*
* Create new io buffer, call io_close() when done with it.
* Function always returns a new buffer.
*/
struct ibuf *
io_buf_new(void)
{
struct ibuf *b;
if ((b = ibuf_dynamic(64, INT32_MAX)) == NULL)
err(1, NULL);
ibuf_reserve(b, sizeof(size_t)); /* can not fail */
return b;
}
/*
* Add a simple object of static size to the io buffer.
*/
void
io_simple_buffer(struct ibuf *b, const void *res, size_t sz)
{
if (ibuf_add(b, res, sz) == -1)
err(1, NULL);
}
/*
* Add a sz sized buffer into the io buffer.
*/
void
io_buf_buffer(struct ibuf *b, const void *p, size_t sz)
{
if (ibuf_add(b, &sz, sizeof(size_t)) == -1)
err(1, NULL);
if (sz > 0)
if (ibuf_add(b, p, sz) == -1)
err(1, NULL);
}
/*
* Add a string into the io buffer.
*/
void
io_str_buffer(struct ibuf *b, const char *p)
{
size_t sz = (p == NULL) ? 0 : strlen(p);
io_buf_buffer(b, p, sz);
}
/*
* Finish and enqueue a io buffer.
*/
void
io_buf_close(struct msgbuf *msgbuf, struct ibuf *b)
{
size_t len;
len = ibuf_size(b);
memcpy(ibuf_seek(b, 0, sizeof(len)), &len, sizeof(len));
ibuf_close(msgbuf, b);
}
/*
* Read of a binary buffer that must be on a blocking descriptor.
* Does nothing if "sz" is zero.
* This will fail and exit on EOF.
*/
void
io_simple_read(int fd, void *res, size_t sz)
{
ssize_t ssz;
char *tmp;
tmp = res; /* arithmetic on a pointer to void is a GNU extension */
again:
if (sz == 0)
return;
if ((ssz = read(fd, tmp, sz)) == -1)
err(1, "read");
else if (ssz == 0)
errx(1, "read: unexpected end of file");
else if ((size_t)ssz == sz)
return;
sz -= ssz;
tmp += ssz;
goto again;
}
/*
* Read a binary buffer, allocating space for it.
* If the buffer is zero-sized, this won't allocate "res", but
* will still initialise it to NULL.
*/
void
io_buf_read_alloc(int fd, void **res, size_t *sz)
{
*res = NULL;
io_simple_read(fd, sz, sizeof(size_t));
if (*sz == 0)
return;
if ((*res = malloc(*sz)) == NULL)
err(1, NULL);
io_simple_read(fd, *res, *sz);
}
/*
* Read a string (returns NULL for zero-length strings), allocating
* space for it.
*/
void
io_str_read(int fd, char **res)
{
size_t sz;
io_simple_read(fd, &sz, sizeof(size_t));
if (sz == 0) {
*res = NULL;
return;
}
if ((*res = calloc(sz + 1, 1)) == NULL)
err(1, NULL);
io_simple_read(fd, *res, sz);
}
/*
* Read data from socket but receive a file descriptor at the same time.
*/
int
io_recvfd(int fd, void *res, size_t sz)
{
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(int))];
} cmsgbuf;
int outfd = -1;
char *b = res;
ssize_t n;
memset(&msg, 0, sizeof(msg));
memset(&cmsgbuf, 0, sizeof(cmsgbuf));
iov.iov_base = res;
iov.iov_len = sz;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = &cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
while ((n = recvmsg(fd, &msg, 0)) == -1) {
if (errno == EINTR)
continue;
err(1, "recvmsg");
}
if (n == 0)
errx(1, "recvmsg: unexpected end of file");
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
int i, j, f;
j = ((char *)cmsg + cmsg->cmsg_len -
(char *)CMSG_DATA(cmsg)) / sizeof(int);
for (i = 0; i < j; i++) {
f = ((int *)CMSG_DATA(cmsg))[i];
if (i == 0)
outfd = f;
else
close(f);
}
}
}
b += n;
sz -= n;
while (sz > 0) {
/* short receive */
n = recv(fd, b, sz, 0);
if (n == -1) {
if (errno == EINTR)
continue;
err(1, "recv");
}
if (n == 0)
errx(1, "recv: unexpected end of file");
b += n;
sz -= n;
}
return outfd;
}
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