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Copy pathcmd-queue.c
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857 lines (727 loc) · 19 KB
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/* $OpenBSD: cmd-queue.c,v 1.124 2026/09/22 06:46:50 nicm Exp $ */
/*
* Copyright (c) 2013 Nicholas Marriott <[email protected]>
*
* 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 <ctype.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "tmux.h"
/* Command queue flags. */
#define CMDQ_FIRED 0x1
#define CMDQ_WAITING 0x2
/* Command queue item type. */
enum cmdq_type {
CMDQ_COMMAND,
CMDQ_CALLBACK,
CMDQ_INVOKE,
};
/* Command queue item. */
struct cmdq_item {
char *name;
struct cmdq_list *queue;
struct cmdq_item *next;
struct client *client;
struct client *target_client;
enum cmdq_type type;
u_int number;
time_t time;
int flags;
struct cmdq_state *state;
struct cmd_find_state source;
struct cmd_find_state target;
struct cmd *cmd;
struct cmd_invoke_state *invoke_state;
cmdq_cb cb;
void *data;
TAILQ_ENTRY(cmdq_item) entry;
};
TAILQ_HEAD(cmdq_item_list, cmdq_item);
/*
* Command queue state. This is the context for commands on the command queue.
* It holds information about how the commands were fired (the key and flags),
* any additional formats for the commands, and the current default target.
* Multiple commands can share the same state and a command may update the
* default target.
*/
struct cmdq_state {
int references;
int flags;
struct format_tree *formats;
struct key_event event;
struct cmd_find_state current;
};
/* Command queue. */
struct cmdq_list {
struct cmdq_item *item;
struct cmdq_item_list list;
};
/* Get command queue name. */
static const char *
cmdq_name(struct client *c)
{
static char s[256];
if (c == NULL)
return ("<global>");
if (c->name != NULL)
xsnprintf(s, sizeof s, "<%s>", c->name);
else
xsnprintf(s, sizeof s, "<%p>", c);
return (s);
}
/* Get command queue from client. */
static struct cmdq_list *
cmdq_get(struct client *c)
{
static struct cmdq_list *global_queue;
if (c == NULL) {
if (global_queue == NULL)
global_queue = cmdq_new();
return (global_queue);
}
return (c->queue);
}
/* Create a queue. */
struct cmdq_list *
cmdq_new(void)
{
struct cmdq_list *queue;
queue = xcalloc(1, sizeof *queue);
TAILQ_INIT (&queue->list);
return (queue);
}
/* Free a queue. */
void
cmdq_free(struct cmdq_list *queue)
{
if (!TAILQ_EMPTY(&queue->list))
fatalx("queue not empty");
free(queue);
}
/* Get item name. */
const char *
cmdq_get_name(struct cmdq_item *item)
{
return (item->name);
}
/* Get item command. */
struct cmd *
cmdq_get_cmd(struct cmdq_item *item)
{
return (item->cmd);
}
/* Get item client. */
struct client *
cmdq_get_client(struct cmdq_item *item)
{
return (item->client);
}
/* Get item target client. */
struct client *
cmdq_get_target_client(struct cmdq_item *item)
{
return (item->target_client);
}
/* Get item state. */
struct cmdq_state *
cmdq_get_state(struct cmdq_item *item)
{
return (item->state);
}
/* Get item target. */
struct cmd_find_state *
cmdq_get_target(struct cmdq_item *item)
{
return (&item->target);
}
/* Get item source. */
struct cmd_find_state *
cmdq_get_source(struct cmdq_item *item)
{
return (&item->source);
}
/* Get state event. */
struct key_event *
cmdq_get_event(struct cmdq_item *item)
{
return (&item->state->event);
}
/* Get state current target. */
struct cmd_find_state *
cmdq_get_current(struct cmdq_item *item)
{
return (&item->state->current);
}
/* Get state flags. */
int
cmdq_get_flags(struct cmdq_item *item)
{
return (item->state->flags);
}
/* Create a new state. */
struct cmdq_state *
cmdq_new_state(struct cmd_find_state *current, struct key_event *event,
int flags)
{
struct cmdq_state *state;
state = xcalloc(1, sizeof *state);
state->references = 1;
state->flags = flags;
if (event != NULL)
memcpy(&state->event, event, sizeof state->event);
else
state->event.key = KEYC_NONE;
if (current != NULL && cmd_find_valid_state(current))
cmd_find_copy_state(&state->current, current);
else
cmd_find_clear_state(&state->current, 0);
return (state);
}
/* Add a reference to a state. */
struct cmdq_state *
cmdq_link_state(struct cmdq_state *state)
{
state->references++;
return (state);
}
/* Make a copy of a state. */
struct cmdq_state *
cmdq_copy_state(struct cmdq_state *state, struct cmd_find_state *current)
{
if (current != NULL)
return (cmdq_new_state(current, &state->event, state->flags));
return (cmdq_new_state(&state->current, &state->event, state->flags));
}
/* Free a state. */
void
cmdq_free_state(struct cmdq_state *state)
{
if (--state->references != 0)
return;
if (state->formats != NULL)
format_free(state->formats);
free(state);
}
/* Add a format to command queue. */
void
cmdq_add_format(struct cmdq_state *state, const char *key, const char *fmt, ...)
{
va_list ap;
char *value;
va_start(ap, fmt);
xvasprintf(&value, fmt, ap);
va_end(ap);
if (state->formats == NULL)
state->formats = format_create(NULL, NULL, FORMAT_NONE, 0);
format_add(state->formats, key, "%s", value);
free(value);
}
/* Add formats to command queue. */
void
cmdq_add_formats(struct cmdq_state *state, struct format_tree *ft)
{
if (state->formats == NULL)
state->formats = format_create(NULL, NULL, FORMAT_NONE, 0);
format_merge(state->formats, ft);
}
/* Merge formats from item. */
void
cmdq_merge_formats(struct cmdq_item *item, struct format_tree *ft)
{
const struct cmd_entry *entry;
if (item->cmd != NULL) {
entry = cmd_get_entry(item->cmd);
format_add(ft, "command", "%s", entry->name);
}
if (item->state->formats != NULL)
format_merge(ft, item->state->formats);
}
/* Append an item. */
struct cmdq_item *
cmdq_append(struct client *c, struct cmdq_item *item)
{
struct cmdq_list *queue = cmdq_get(c);
struct cmdq_item *next;
do {
next = item->next;
item->next = NULL;
if (c != NULL)
c->references++;
item->client = c;
item->queue = queue;
TAILQ_INSERT_TAIL(&queue->list, item, entry);
log_debug("%s %s: %s", __func__, cmdq_name(c), item->name);
item = next;
} while (item != NULL);
return (TAILQ_LAST(&queue->list, cmdq_item_list));
}
/* Insert an item. */
struct cmdq_item *
cmdq_insert_after(struct cmdq_item *after, struct cmdq_item *item)
{
struct client *c = after->client;
struct cmdq_list *queue = after->queue;
struct cmdq_item *next;
do {
next = item->next;
item->next = after->next;
after->next = item;
if (c != NULL)
c->references++;
item->client = c;
item->queue = queue;
TAILQ_INSERT_AFTER(&queue->list, after, item, entry);
log_debug("%s %s: %s after %s", __func__, cmdq_name(c),
item->name, after->name);
after = item;
item = next;
} while (item != NULL);
return (after);
}
/* Insert a hook. */
void
cmdq_insert_hook(__unused struct session *s, struct cmdq_item *item,
struct cmd_find_state *current, const char *fmt, ...)
{
struct cmd *cmd = item->cmd;
struct args *args = cmd_get_args(cmd);
struct args_entry *ae;
struct args_value *av;
struct event_payload *ep;
va_list ap;
char *name, tmp[32], flag, *arguments;
u_int i;
const char *value;
if (item->state->flags & CMDQ_STATE_NOHOOKS)
return;
va_start(ap, fmt);
xvasprintf(&name, fmt, ap);
va_end(ap);
ep = event_payload_create();
if (current != NULL)
event_payload_set_target(ep, current);
event_payload_set_pointer(ep, "_cmdq_item", item, NULL, NULL);
arguments = args_print(args);
event_payload_set_string(ep, "arguments", "%s", arguments);
free(arguments);
for (i = 0; i < args_count(args); i++) {
xsnprintf(tmp, sizeof tmp, "argument_%u", i);
event_payload_set_string(ep, tmp, "%s", args_string(args, i));
}
flag = args_first(args, &ae);
while (flag != 0) {
value = args_get(args, flag);
xsnprintf(tmp, sizeof tmp, "flag_%c", flag);
if (value == NULL)
event_payload_set_string(ep, tmp, "1");
else
event_payload_set_string(ep, tmp, "%s", value);
i = 0;
av = args_first_value(args, flag);
while (av != NULL) {
xsnprintf(tmp, sizeof tmp, "flag_%c_%u", flag, i);
event_payload_set_string(ep, tmp, "%s", av->string);
i++;
av = args_next_value(av);
}
flag = args_next(&ae);
}
events_fire(name, ep);
free(name);
}
/* Continue processing command queue. */
void
cmdq_continue(struct cmdq_item *item)
{
item->flags &= ~CMDQ_WAITING;
}
/* Remove an item. */
static void
cmdq_remove(struct cmdq_item *item)
{
if (item->client != NULL)
server_client_unref(item->client);
if (item->cmd != NULL)
cmd_free(item->cmd);
if (item->invoke_state != NULL)
cmd_invoke_state_free(item->invoke_state);
cmdq_free_state(item->state);
TAILQ_REMOVE(&item->queue->list, item, entry);
free(item->name);
free(item);
}
/* Get a single command for command queue with invoke state. */
struct cmdq_item *
cmdq_get_one_command(struct cmd *cmd, struct cmdq_state *state,
struct cmd_invoke_state *invoke_state)
{
struct cmdq_item *item;
const struct cmd_entry *entry = cmd_get_entry(cmd);
item = xcalloc(1, sizeof *item);
xasprintf(&item->name, "[%s/%p]", entry->name, item);
item->type = CMDQ_COMMAND;
item->cmd = cmd;
if (state == NULL)
item->state = cmdq_new_state(NULL, NULL, 0);
else
item->state = cmdq_link_state(state);
if (invoke_state != NULL)
item->invoke_state = cmd_invoke_state_add_ref(invoke_state);
log_debug("%s: %s", __func__, item->name);
return (item);
}
/* Get an invoke continuation for command queue. */
struct cmdq_item *
cmdq_get_invoke(struct cmd_invoke_state *invoke_state, struct cmdq_state *state)
{
struct cmdq_item *item;
item = xcalloc(1, sizeof *item);
xasprintf(&item->name, "[invoke/%p]", item);
item->type = CMDQ_INVOKE;
if (state == NULL)
item->state = cmdq_new_state(NULL, NULL, 0);
else
item->state = cmdq_link_state(state);
item->invoke_state = cmd_invoke_state_add_ref(invoke_state);
return (item);
}
/* Fill in flag for a command. */
static enum cmd_retval
cmdq_find_flag(struct cmdq_item *item, struct cmd_find_state *fs,
const struct cmd_entry_flag *flag)
{
const char *value;
if (flag->flag == 0) {
cmd_find_from_client(fs, item->target_client, 0);
return (CMD_RETURN_NORMAL);
}
value = args_get(cmd_get_args(item->cmd), flag->flag);
if (cmd_find_target(fs, item, value, flag->type, flag->flags) != 0) {
cmd_find_clear_state(fs, 0);
return (CMD_RETURN_ERROR);
}
return (CMD_RETURN_NORMAL);
}
/* Add message with command. */
static void
cmdq_add_message(struct cmdq_item *item)
{
struct client *c = item->client;
struct cmdq_state *state = item->state;
const char *key;
char *tmp;
uid_t uid;
struct passwd *pw;
char *user = NULL;
tmp = cmd_print(item->cmd);
if (c != NULL) {
uid = proc_get_peer_uid(c->peer);
if (uid != (uid_t)-1 && uid != getuid()) {
if ((pw = getpwuid(uid)) != NULL)
xasprintf(&user, "[%s]", pw->pw_name);
else
user = xstrdup("[unknown]");
} else
user = xstrdup("");
if (c->session != NULL && state->event.key != KEYC_NONE) {
key = key_string_lookup_key(state->event.key, 0);
server_add_message("%s%s key %s: %s", c->name, user,
key, tmp);
} else {
server_add_message("%s%s command: %s", c->name, user,
tmp);
}
free(user);
} else
server_add_message("command: %s", tmp);
free(tmp);
}
/* Fire command on command queue. */
static enum cmd_retval
cmdq_fire_command(struct cmdq_item *item)
{
const char *name = cmdq_name(item->client);
struct cmdq_state *state = item->state;
struct cmd *cmd = item->cmd;
struct args *args = cmd_get_args(cmd);
const struct cmd_entry *entry = cmd_get_entry(cmd);
struct client *tc, *saved = item->client;
enum cmd_retval retval;
struct cmd_find_state *fsp, fs;
int flags, quiet = 0;
char *tmp;
if (item->client != NULL && (item->client->flags & CLIENT_DEAD))
return (CMD_RETURN_ERROR);
if (cfg_finished)
cmdq_add_message(item);
if (log_get_level() > 1) {
tmp = cmd_print(cmd);
log_debug("%s %s: %s", __func__, name, tmp);
free(tmp);
}
flags = !!(state->flags & CMDQ_STATE_CONTROL);
cmdq_guard(item, "begin", flags);
if (item->client == NULL)
item->client = cmd_find_client(item, NULL, 1);
if (entry->flags & CMD_CLIENT_CANFAIL)
quiet = 1;
if (entry->flags & CMD_CLIENT_CFLAG) {
tc = cmd_find_client(item, args_get(args, 'c'), quiet);
if (tc == NULL && !quiet) {
retval = CMD_RETURN_ERROR;
goto out;
}
} else if (entry->flags & CMD_CLIENT_TFLAG) {
tc = cmd_find_client(item, args_get(args, 't'), quiet);
if (tc == NULL && !quiet) {
retval = CMD_RETURN_ERROR;
goto out;
}
} else
tc = cmd_find_client(item, NULL, 1);
item->target_client = tc;
retval = cmdq_find_flag(item, &item->source, &entry->source);
if (retval == CMD_RETURN_ERROR)
goto out;
retval = cmdq_find_flag(item, &item->target, &entry->target);
if (retval == CMD_RETURN_ERROR)
goto out;
retval = entry->exec(cmd, item);
if (retval == CMD_RETURN_ERROR)
goto out;
if (entry->flags & CMD_AFTERHOOK) {
if (cmd_find_valid_state(&item->target))
fsp = &item->target;
else if (cmd_find_valid_state(&item->state->current))
fsp = &item->state->current;
else if (cmd_find_from_client(&fs, item->client, 0) == 0)
fsp = &fs;
else
goto out;
cmdq_insert_hook(fsp->s, item, fsp, "after-%s", entry->name);
}
out:
item->client = saved;
if (retval == CMD_RETURN_ERROR) {
fsp = NULL;
if (cmd_find_valid_state(&item->target))
fsp = &item->target;
else if (cmd_find_valid_state(&item->state->current))
fsp = &item->state->current;
else if (cmd_find_from_client(&fs, item->client, 0) == 0)
fsp = &fs;
cmdq_insert_hook(fsp != NULL ? fsp->s : NULL, item, fsp,
"command-error");
cmdq_guard(item, "error", flags);
} else
cmdq_guard(item, "end", flags);
return (retval);
}
/* Get a callback for the command queue. */
struct cmdq_item *
cmdq_get_callback1(const char *name, cmdq_cb cb, void *data)
{
struct cmdq_item *item;
item = xcalloc(1, sizeof *item);
xasprintf(&item->name, "[%s/%p]", name, item);
item->type = CMDQ_CALLBACK;
item->state = cmdq_new_state(NULL, NULL, 0);
item->cb = cb;
item->data = data;
return (item);
}
/* Generic error callback. */
static enum cmd_retval
cmdq_error_callback(struct cmdq_item *item, void *data)
{
char *error = data;
cmdq_error(item, "%s", error);
free(error);
return (CMD_RETURN_NORMAL);
}
/* Get an error callback for the command queue. */
struct cmdq_item *
cmdq_get_error(const char *error)
{
return (cmdq_get_callback(cmdq_error_callback, xstrdup(error)));
}
/* Fire callback on callback queue. */
static enum cmd_retval
cmdq_fire_callback(struct cmdq_item *item)
{
return (item->cb(item, item->data));
}
/* Process next item on command queue. */
u_int
cmdq_next(struct client *c)
{
struct cmdq_list *queue = cmdq_get(c);
const char *name = cmdq_name(c);
struct cmdq_item *item;
enum cmd_retval retval;
u_int items = 0;
static u_int number;
if (TAILQ_EMPTY(&queue->list)) {
log_debug("%s %s: empty", __func__, name);
return (0);
}
if (TAILQ_FIRST(&queue->list)->flags & CMDQ_WAITING) {
log_debug("%s %s: waiting", __func__, name);
return (0);
}
log_debug("%s %s: enter", __func__, name);
for (;;) {
item = queue->item = TAILQ_FIRST(&queue->list);
if (item == NULL)
break;
log_debug("%s %s: %s (%d), flags %x", __func__, name,
item->name, item->type, item->flags);
/*
* Any item with the waiting flag set waits until an external
* event clears the flag (for example, a job - look at
* run-shell).
*/
if (item->flags & CMDQ_WAITING)
goto waiting;
/*
* Items are only fired once, once the fired flag is set, a
* waiting flag can only be cleared by an external event.
*/
if (~item->flags & CMDQ_FIRED) {
item->time = time(NULL);
item->number = ++number;
switch (item->type) {
case CMDQ_COMMAND:
retval = cmdq_fire_command(item);
if (item->invoke_state != NULL)
cmd_invoke_result(item->invoke_state, retval);
break;
case CMDQ_CALLBACK:
retval = cmdq_fire_callback(item);
break;
case CMDQ_INVOKE:
retval = cmd_invoke_fire(item, item->invoke_state);
break;
default:
retval = CMD_RETURN_ERROR;
break;
}
item->flags |= CMDQ_FIRED;
if (retval == CMD_RETURN_WAIT) {
item->flags |= CMDQ_WAITING;
goto waiting;
}
items++;
}
cmdq_remove(item);
}
queue->item = NULL;
log_debug("%s %s: exit (empty)", __func__, name);
return (items);
waiting:
log_debug("%s %s: exit (wait)", __func__, name);
return (items);
}
/* Get running item if any. */
struct cmdq_item *
cmdq_running(struct client *c)
{
struct cmdq_list *queue = cmdq_get(c);
if (queue->item == NULL)
return (NULL);
if (queue->item->flags & CMDQ_WAITING)
return (NULL);
return (queue->item);
}
/* Print a guard line. */
void
cmdq_guard(struct cmdq_item *item, const char *guard, int flags)
{
struct client *c = item->client;
long t = item->time;
u_int number = item->number;
if (c != NULL && (c->flags & CLIENT_CONTROL))
control_write_guard(c, guard, t, number, flags);
}
/* Show message from command. */
void
cmdq_print_data(struct cmdq_item *item, struct evbuffer *evb)
{
server_client_print(item->client, 1, evb);
}
/* Show message from command. */
void
cmdq_print(struct cmdq_item *item, const char *fmt, ...)
{
va_list ap;
struct evbuffer *evb;
evb = evbuffer_new();
if (evb == NULL)
fatalx("out of memory");
va_start(ap, fmt);
evbuffer_add_vprintf(evb, fmt, ap);
va_end(ap);
cmdq_print_data(item, evb);
evbuffer_free(evb);
}
/* Show error from command. */
void
cmdq_error(struct cmdq_item *item, const char *fmt, ...)
{
struct client *c = item->client;
struct cmd *cmd = item->cmd;
va_list ap;
char *msg, *tmp;
const char *file;
u_int line;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
log_debug("%s: %s", __func__, msg);
if (c == NULL) {
cmd_get_source(cmd, &file, &line);
if (!cfg_finished) {
if (file != NULL)
cfg_add_cause("%s:%u: %s", file, line, msg);
else
cfg_add_cause("%s", msg);
} else {
if (file != NULL) {
server_add_message("message: %s:%u: %s", file,
line, msg);
} else
server_add_message("message: %s", msg);
}
} else if (c->session == NULL || (c->flags & CLIENT_CONTROL)) {
server_add_message("%s message: %s", c->name, msg);
if (~c->flags & CLIENT_UTF8) {
tmp = msg;
msg = utf8_sanitize(tmp);
free(tmp);
}
if (c->flags & CLIENT_CONTROL)
control_write(c, "%s", msg);
else
file_error(c, "%s\n", msg);
c->retval = 1;
} else {
*msg = toupper((u_char) *msg);
status_message_set(c, -1, 1, 0, 0, "%s", msg);
}
free(msg);
}