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Sync OpenBSD patchset 243:

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Switch tmux to use imsg. This is the last major change to make the
client-server protocol more resilient and make the protocol versioning work
properly. In future, the only things requiring a protocol version bump will be
changes in the message structs, and (when both client and server have this
change) mixing different versions should nicely report an error message.

As a side effect this also makes the code tidier, fixes a problem with the way
errors reported during server startup were handled, and supports fd passing
(which will be used in future).

Looked over by eric@, thanks.

Please note that mixing a client with this change with an older server or vice
versa may cause tmux to crash or hang - tmux should be completely exited before
upgrading.
This commit is contained in:
Tiago Cunha
2009-08-14 21:04:04 +00:00
parent a604dfbb97
commit a9b6bfdddd
11 changed files with 880 additions and 149 deletions
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108
compat/imsg.h Normal file
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/* $OpenBSD: imsg.h,v 1.1 2009/08/11 17:18:35 nicm Exp $ */
/*
* Copyright (c) 2006, 2007 Pierre-Yves Ritschard <pyr@openbsd.org>
* Copyright (c) 2006, 2007, 2008 Reyk Floeter <reyk@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/tree.h>
#define READ_BUF_SIZE 65535
#define IMSG_HEADER_SIZE sizeof(struct imsg_hdr)
#define MAX_IMSGSIZE 16384
struct buf {
TAILQ_ENTRY(buf) entry;
u_char *buf;
size_t size;
size_t max;
size_t wpos;
size_t rpos;
int fd;
};
struct msgbuf {
TAILQ_HEAD(, buf) bufs;
u_int32_t queued;
int fd;
};
struct buf_read {
u_char buf[READ_BUF_SIZE];
u_char *rptr;
size_t wpos;
};
struct imsg_fd {
TAILQ_ENTRY(imsg_fd) entry;
int fd;
};
struct imsgbuf {
TAILQ_HEAD(, imsg_fd) fds;
struct buf_read r;
struct msgbuf w;
int fd;
pid_t pid;
};
#define IMSGF_HASFD 1
struct imsg_hdr {
u_int32_t type;
u_int16_t len;
u_int16_t flags;
u_int32_t peerid;
u_int32_t pid;
};
struct imsg {
struct imsg_hdr hdr;
int fd;
void *data;
};
/* buffer.c */
struct buf *buf_open(size_t);
struct buf *buf_dynamic(size_t, size_t);
int buf_add(struct buf *, const void *, size_t);
void *buf_reserve(struct buf *, size_t);
void *buf_seek(struct buf *, size_t, size_t);
size_t buf_size(struct buf *);
size_t buf_left(struct buf *);
void buf_close(struct msgbuf *, struct buf *);
int buf_write(struct msgbuf *);
void buf_free(struct buf *);
void msgbuf_init(struct msgbuf *);
void msgbuf_clear(struct msgbuf *);
int msgbuf_write(struct msgbuf *);
/* imsg.c */
void imsg_init(struct imsgbuf *, int);
ssize_t imsg_read(struct imsgbuf *);
ssize_t imsg_get(struct imsgbuf *, struct imsg *);
int imsg_compose(struct imsgbuf *, u_int32_t, u_int32_t, pid_t,
int, void *, u_int16_t);
int imsg_composev(struct imsgbuf *, u_int32_t, u_int32_t, pid_t,
int, const struct iovec *, int);
struct buf *imsg_create(struct imsgbuf *, u_int32_t, u_int32_t, pid_t,
u_int16_t);
int imsg_add(struct buf *, void *, u_int16_t);
void imsg_close(struct imsgbuf *, struct buf *);
void imsg_free(struct imsg *);
int imsg_flush(struct imsgbuf *);
void imsg_clear(struct imsgbuf *);