tmux/server-msg.c

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/* $Id: server-msg.c,v 1.39 2007-11-27 20:01:30 nicm Exp $ */
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/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 MIND, 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 <errno.h>
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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
int server_msg_fn_command(struct hdr *, struct client *);
int server_msg_fn_identify(struct hdr *, struct client *);
int server_msg_fn_resize(struct hdr *, struct client *);
int server_msg_fn_exiting(struct hdr *, struct client *);
void printflike2 server_msg_fn_command_error(
struct cmd_ctx *, const char *, ...);
void printflike2 server_msg_fn_command_print(
struct cmd_ctx *, const char *, ...);
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struct server_msg {
enum hdrtype type;
int (*fn)(struct hdr *, struct client *);
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};
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const struct server_msg server_msg_table[] = {
{ MSG_IDENTIFY, server_msg_fn_identify },
{ MSG_COMMAND, server_msg_fn_command },
{ MSG_RESIZE, server_msg_fn_resize },
{ MSG_EXITING, server_msg_fn_exiting }
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};
#define NSERVERMSG (sizeof server_msg_table / sizeof server_msg_table[0])
int
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server_msg_dispatch(struct client *c)
{
struct hdr hdr;
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const struct server_msg *msg;
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u_int i;
int n;
for (;;) {
if (BUFFER_USED(c->in) < sizeof hdr)
return (0);
memcpy(&hdr, BUFFER_OUT(c->in), sizeof hdr);
if (BUFFER_USED(c->in) < (sizeof hdr) + hdr.size)
return (0);
buffer_remove(c->in, sizeof hdr);
for (i = 0; i < NSERVERMSG; i++) {
msg = server_msg_table + i;
if (msg->type == hdr.type) {
if ((n = msg->fn(&hdr, c)) != 0)
return (n);
break;
}
}
if (i == NSERVERMSG)
fatalx("unexpected message");
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}
}
void printflike2
server_msg_fn_command_error(struct cmd_ctx *ctx, const char *fmt, ...)
{
va_list ap;
char *msg;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
server_write_client(ctx->cmdclient, MSG_ERROR, msg, strlen(msg));
xfree(msg);
}
void printflike2
server_msg_fn_command_print(struct cmd_ctx *ctx, const char *fmt, ...)
{
va_list ap;
char *msg;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
server_write_client(ctx->cmdclient, MSG_PRINT, msg, strlen(msg));
xfree(msg);
}
int
server_msg_fn_command(struct hdr *hdr, struct client *c)
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{
struct msg_command_data data;
struct cmd_ctx ctx;
struct cmd *cmd;
char *name, *client, *cause;
u_int i;
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/* XXX I hate this function. Split it? */
if (hdr->size < sizeof data)
fatalx("bad MSG_COMMAND size");
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buffer_read(c->in, &data, sizeof data);
name = cmd_recv_string(c->in);
client = cmd_recv_string(c->in);
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cmd = cmd_recv(c->in);
log_debug("got command %s from client %d", cmd->entry->name, c->fd);
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ctx.error = server_msg_fn_command_error;
ctx.print = server_msg_fn_command_print;
ctx.cmdclient = c;
ctx.flags = 0;
if (data.pid != -1 && (cmd->entry->flags & CMD_CANTNEST)) {
server_msg_fn_command_error(&ctx, "sessions "
"should be nested with care. unset $TMUX to force");
goto out;
}
ctx.client = NULL;
if (cmd->entry->flags & CMD_NOCLIENT) {
if (client != NULL) {
server_msg_fn_command_error(&ctx,
"%s: cannot specify a client", cmd->entry->name);
goto out;
}
} else {
if (client == NULL) {
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server_msg_fn_command_error(&ctx,
"%s: must specify a client", cmd->entry->name);
goto out;
}
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
/* XXX fnmatch, multi clients etc */
c = ARRAY_ITEM(&clients, i);
if (c != NULL && strcmp(client, c->tty.path) == 0)
ctx.client = c;
}
if (ctx.client == NULL) {
server_msg_fn_command_error(&ctx, "%s: "
"client not found: %s", cmd->entry->name, client);
goto out;
}
}
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ctx.session = NULL;
if (cmd->entry->flags & CMD_NOSESSION) {
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if (name != NULL) {
server_msg_fn_command_error(&ctx,
"%s: cannot specify a session", cmd->entry->name);
goto out;
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}
} else {
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ctx.session = server_extract_session(&data, name, &cause);
if (ctx.session == NULL) {
server_msg_fn_command_error(
&ctx, "%s: %s", cmd->entry->name, cause);
xfree(cause);
goto out;
}
}
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cmd_exec(cmd, &ctx);
cmd_free(cmd);
out:
if (name != NULL)
xfree(name);
return (0);
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}
int
server_msg_fn_identify(struct hdr *hdr, struct client *c)
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{
struct msg_identify_data data;
char *term;
if (hdr->size < sizeof data)
fatalx("bad MSG_IDENTIFY size");
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buffer_read(c->in, &data, sizeof data);
term = cmd_recv_string(c->in);
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log_debug("identify msg from client: %u,%u", data.sx, data.sy);
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c->sx = data.sx;
c->sy = data.sy;
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data.tty[(sizeof data.tty) - 1] = '\0';
tty_init(&c->tty, data.tty, xstrdup(term));
xfree(term);
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c->flags |= CLIENT_TERMINAL;
return (0);
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}
int
server_msg_fn_resize(struct hdr *hdr, struct client *c)
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{
struct msg_resize_data data;
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if (hdr->size != sizeof data)
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fatalx("bad MSG_RESIZE size");
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buffer_read(c->in, &data, sizeof data);
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log_debug("resize msg from client: %u,%u", data.sx, data.sy);
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c->sx = data.sx;
if (c->sx == 0)
c->sx = 80;
c->sy = data.sy;
if (c->sy == 0)
c->sy = 25;
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recalculate_sizes();
/* Always redraw this client. */
server_redraw_client(c);
return (0);
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}
int
server_msg_fn_exiting(struct hdr *hdr, struct client *c)
{
if (hdr->size != 0)
fatalx("bad MSG_EXITING size");
log_debug("exiting msg from client");
c->session = NULL;
if (c->tty.fd != -1)
tty_free(&c->tty);
recalculate_sizes();
server_write_client(c, MSG_EXITED, NULL, 0);
return (0);
}