mirror of
https://github.com/tmux/tmux.git
synced 2024-12-27 03:48:46 +00:00
379 lines
7.3 KiB
C
379 lines
7.3 KiB
C
/* $OpenBSD: imsg.c,v 1.37 2024/11/26 13:57:31 claudio Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2023 Claudio Jeker <claudio@openbsd.org>
|
|
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
|
|
*
|
|
* 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/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/uio.h>
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "compat.h"
|
|
#include "imsg.h"
|
|
|
|
#define IMSG_ALLOW_FDPASS 0x01
|
|
#define IMSG_FD_MARK 0x80000000U
|
|
|
|
static struct ibuf *imsg_parse_hdr(struct ibuf *, void *, int *);
|
|
|
|
int
|
|
imsgbuf_init(struct imsgbuf *imsgbuf, int fd)
|
|
{
|
|
imsgbuf->w = msgbuf_new_reader(IMSG_HEADER_SIZE, imsg_parse_hdr,
|
|
imsgbuf);
|
|
if (imsgbuf->w == NULL)
|
|
return (-1);
|
|
imsgbuf->pid = getpid();
|
|
imsgbuf->maxsize = MAX_IMSGSIZE;
|
|
imsgbuf->fd = fd;
|
|
imsgbuf->flags = 0;
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
imsgbuf_allow_fdpass(struct imsgbuf *imsgbuf)
|
|
{
|
|
imsgbuf->flags |= IMSG_ALLOW_FDPASS;
|
|
}
|
|
|
|
int
|
|
imsgbuf_set_maxsize(struct imsgbuf *imsgbuf, uint32_t maxsize)
|
|
{
|
|
if (maxsize < IMSG_HEADER_SIZE || maxsize & IMSG_FD_MARK) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
imsgbuf->maxsize = maxsize;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
imsgbuf_read(struct imsgbuf *imsgbuf)
|
|
{
|
|
if (imsgbuf->flags & IMSG_ALLOW_FDPASS)
|
|
return msgbuf_read(imsgbuf->fd, imsgbuf->w);
|
|
else
|
|
return ibuf_read(imsgbuf->fd, imsgbuf->w);
|
|
}
|
|
|
|
int
|
|
imsgbuf_write(struct imsgbuf *imsgbuf)
|
|
{
|
|
if (imsgbuf->flags & IMSG_ALLOW_FDPASS)
|
|
return msgbuf_write(imsgbuf->fd, imsgbuf->w);
|
|
else
|
|
return ibuf_write(imsgbuf->fd, imsgbuf->w);
|
|
}
|
|
|
|
int
|
|
imsgbuf_flush(struct imsgbuf *imsgbuf)
|
|
{
|
|
while (imsgbuf_queuelen(imsgbuf) > 0) {
|
|
if (imsgbuf_write(imsgbuf) == -1)
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
imsgbuf_clear(struct imsgbuf *imsgbuf)
|
|
{
|
|
msgbuf_free(imsgbuf->w);
|
|
imsgbuf->w = NULL;
|
|
}
|
|
|
|
uint32_t
|
|
imsgbuf_queuelen(struct imsgbuf *imsgbuf)
|
|
{
|
|
return msgbuf_queuelen(imsgbuf->w);
|
|
}
|
|
|
|
ssize_t
|
|
imsg_get(struct imsgbuf *imsgbuf, struct imsg *imsg)
|
|
{
|
|
struct imsg m;
|
|
struct ibuf *buf;
|
|
|
|
if ((buf = msgbuf_get(imsgbuf->w)) == NULL)
|
|
return (0);
|
|
|
|
if (ibuf_get(buf, &m.hdr, sizeof(m.hdr)) == -1)
|
|
return (-1);
|
|
|
|
if (ibuf_size(buf))
|
|
m.data = ibuf_data(buf);
|
|
else
|
|
m.data = NULL;
|
|
m.buf = buf;
|
|
m.hdr.len &= ~IMSG_FD_MARK;
|
|
|
|
*imsg = m;
|
|
return (ibuf_size(buf) + IMSG_HEADER_SIZE);
|
|
}
|
|
|
|
int
|
|
imsg_get_ibuf(struct imsg *imsg, struct ibuf *ibuf)
|
|
{
|
|
if (ibuf_size(imsg->buf) == 0) {
|
|
errno = EBADMSG;
|
|
return (-1);
|
|
}
|
|
return ibuf_get_ibuf(imsg->buf, ibuf_size(imsg->buf), ibuf);
|
|
}
|
|
|
|
int
|
|
imsg_get_data(struct imsg *imsg, void *data, size_t len)
|
|
{
|
|
if (len == 0) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
if (ibuf_size(imsg->buf) != len) {
|
|
errno = EBADMSG;
|
|
return (-1);
|
|
}
|
|
return ibuf_get(imsg->buf, data, len);
|
|
}
|
|
|
|
int
|
|
imsg_get_fd(struct imsg *imsg)
|
|
{
|
|
return ibuf_fd_get(imsg->buf);
|
|
}
|
|
|
|
uint32_t
|
|
imsg_get_id(struct imsg *imsg)
|
|
{
|
|
return (imsg->hdr.peerid);
|
|
}
|
|
|
|
size_t
|
|
imsg_get_len(struct imsg *imsg)
|
|
{
|
|
return ibuf_size(imsg->buf);
|
|
}
|
|
|
|
pid_t
|
|
imsg_get_pid(struct imsg *imsg)
|
|
{
|
|
return (imsg->hdr.pid);
|
|
}
|
|
|
|
uint32_t
|
|
imsg_get_type(struct imsg *imsg)
|
|
{
|
|
return (imsg->hdr.type);
|
|
}
|
|
|
|
int
|
|
imsg_compose(struct imsgbuf *imsgbuf, uint32_t type, uint32_t id, pid_t pid,
|
|
int fd, const void *data, size_t datalen)
|
|
{
|
|
struct ibuf *wbuf;
|
|
|
|
if ((wbuf = imsg_create(imsgbuf, type, id, pid, datalen)) == NULL)
|
|
return (-1);
|
|
|
|
if (imsg_add(wbuf, data, datalen) == -1)
|
|
return (-1);
|
|
|
|
ibuf_fd_set(wbuf, fd);
|
|
imsg_close(imsgbuf, wbuf);
|
|
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
imsg_composev(struct imsgbuf *imsgbuf, uint32_t type, uint32_t id, pid_t pid,
|
|
int fd, const struct iovec *iov, int iovcnt)
|
|
{
|
|
struct ibuf *wbuf;
|
|
int i;
|
|
size_t datalen = 0;
|
|
|
|
for (i = 0; i < iovcnt; i++)
|
|
datalen += iov[i].iov_len;
|
|
|
|
if ((wbuf = imsg_create(imsgbuf, type, id, pid, datalen)) == NULL)
|
|
return (-1);
|
|
|
|
for (i = 0; i < iovcnt; i++)
|
|
if (imsg_add(wbuf, iov[i].iov_base, iov[i].iov_len) == -1)
|
|
return (-1);
|
|
|
|
ibuf_fd_set(wbuf, fd);
|
|
imsg_close(imsgbuf, wbuf);
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Enqueue imsg with payload from ibuf buf. fd passing is not possible
|
|
* with this function.
|
|
*/
|
|
int
|
|
imsg_compose_ibuf(struct imsgbuf *imsgbuf, uint32_t type, uint32_t id,
|
|
pid_t pid, struct ibuf *buf)
|
|
{
|
|
struct ibuf *hdrbuf = NULL;
|
|
struct imsg_hdr hdr;
|
|
int save_errno;
|
|
|
|
if (ibuf_size(buf) + IMSG_HEADER_SIZE > imsgbuf->maxsize) {
|
|
errno = ERANGE;
|
|
goto fail;
|
|
}
|
|
|
|
hdr.type = type;
|
|
hdr.len = ibuf_size(buf) + IMSG_HEADER_SIZE;
|
|
hdr.peerid = id;
|
|
if ((hdr.pid = pid) == 0)
|
|
hdr.pid = imsgbuf->pid;
|
|
|
|
if ((hdrbuf = ibuf_open(IMSG_HEADER_SIZE)) == NULL)
|
|
goto fail;
|
|
if (imsg_add(hdrbuf, &hdr, sizeof(hdr)) == -1)
|
|
goto fail;
|
|
|
|
ibuf_close(imsgbuf->w, hdrbuf);
|
|
ibuf_close(imsgbuf->w, buf);
|
|
return (1);
|
|
|
|
fail:
|
|
save_errno = errno;
|
|
ibuf_free(buf);
|
|
ibuf_free(hdrbuf);
|
|
errno = save_errno;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Forward imsg to another channel. Any attached fd is closed.
|
|
*/
|
|
int
|
|
imsg_forward(struct imsgbuf *imsgbuf, struct imsg *msg)
|
|
{
|
|
struct ibuf *wbuf;
|
|
size_t len;
|
|
|
|
ibuf_rewind(msg->buf);
|
|
ibuf_skip(msg->buf, sizeof(msg->hdr));
|
|
len = ibuf_size(msg->buf);
|
|
|
|
if ((wbuf = imsg_create(imsgbuf, msg->hdr.type, msg->hdr.peerid,
|
|
msg->hdr.pid, len)) == NULL)
|
|
return (-1);
|
|
|
|
if (len != 0) {
|
|
if (ibuf_add_ibuf(wbuf, msg->buf) == -1) {
|
|
ibuf_free(wbuf);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
imsg_close(imsgbuf, wbuf);
|
|
return (1);
|
|
}
|
|
|
|
struct ibuf *
|
|
imsg_create(struct imsgbuf *imsgbuf, uint32_t type, uint32_t id, pid_t pid,
|
|
size_t datalen)
|
|
{
|
|
struct ibuf *wbuf;
|
|
struct imsg_hdr hdr;
|
|
|
|
datalen += IMSG_HEADER_SIZE;
|
|
if (datalen > imsgbuf->maxsize) {
|
|
errno = ERANGE;
|
|
return (NULL);
|
|
}
|
|
|
|
hdr.type = type;
|
|
hdr.peerid = id;
|
|
if ((hdr.pid = pid) == 0)
|
|
hdr.pid = imsgbuf->pid;
|
|
if ((wbuf = ibuf_dynamic(datalen, imsgbuf->maxsize)) == NULL) {
|
|
return (NULL);
|
|
}
|
|
if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
|
|
return (NULL);
|
|
|
|
return (wbuf);
|
|
}
|
|
|
|
int
|
|
imsg_add(struct ibuf *msg, const void *data, size_t datalen)
|
|
{
|
|
if (datalen)
|
|
if (ibuf_add(msg, data, datalen) == -1) {
|
|
ibuf_free(msg);
|
|
return (-1);
|
|
}
|
|
return (datalen);
|
|
}
|
|
|
|
void
|
|
imsg_close(struct imsgbuf *imsgbuf, struct ibuf *msg)
|
|
{
|
|
struct imsg_hdr *hdr;
|
|
uint32_t len;
|
|
|
|
len = ibuf_size(msg);
|
|
if (ibuf_fd_avail(msg))
|
|
len |= IMSG_FD_MARK;
|
|
(void)ibuf_set_h32(msg, offsetof(struct imsg_hdr, len), len);
|
|
ibuf_close(imsgbuf->w, msg);
|
|
}
|
|
|
|
void
|
|
imsg_free(struct imsg *imsg)
|
|
{
|
|
ibuf_free(imsg->buf);
|
|
}
|
|
|
|
static struct ibuf *
|
|
imsg_parse_hdr(struct ibuf *buf, void *arg, int *fd)
|
|
{
|
|
struct imsgbuf *imsgbuf = arg;
|
|
struct imsg_hdr hdr;
|
|
struct ibuf *b;
|
|
uint32_t len;
|
|
|
|
if (ibuf_get(buf, &hdr, sizeof(hdr)) == -1)
|
|
return (NULL);
|
|
|
|
len = hdr.len & ~IMSG_FD_MARK;
|
|
|
|
if (len < IMSG_HEADER_SIZE || len > imsgbuf->maxsize) {
|
|
errno = ERANGE;
|
|
return (NULL);
|
|
}
|
|
if ((b = ibuf_open(len)) == NULL)
|
|
return (NULL);
|
|
if (hdr.len & IMSG_FD_MARK) {
|
|
ibuf_fd_set(b, *fd);
|
|
*fd = -1;
|
|
}
|
|
|
|
return b;
|
|
}
|