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irssi/src/fe-common/core/fe-exec.c

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/*
fe-exec.c : irssi
Copyright (C) 2000-2001 Timo Sirainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "module.h"
#include "modules.h"
#include "signals.h"
#include "commands.h"
#include "pidwait.h"
#include "line-split.h"
#include "net-sendbuffer.h"
#include "misc.h"
#include "levels.h"
#include "channels.h"
#include "queries.h"
#include "printtext.h"
#include "fe-exec.h"
#include "fe-windows.h"
#include "window-items.h"
#include <signal.h>
#include <sys/wait.h>
GSList *processes;
static int signal_exec_input;
static void exec_wi_destroy(EXEC_WI_REC *rec)
{
g_return_if_fail(rec != NULL);
if (rec->destroying) return;
rec->destroying = TRUE;
if (window_item_window((WI_ITEM_REC *) rec) != NULL)
window_item_destroy((WI_ITEM_REC *) rec);
MODULE_DATA_DEINIT(rec);
g_free(rec->name);
g_free(rec);
}
static EXEC_WI_REC *exec_wi_create(WINDOW_REC *window, PROCESS_REC *rec)
{
EXEC_WI_REC *item;
g_return_val_if_fail(window != NULL, NULL);
g_return_val_if_fail(rec != NULL, NULL);
item = g_new0(EXEC_WI_REC, 1);
item->type = module_get_uniq_id_str("WINDOW ITEM TYPE", "EXEC");
item->destroy = (void (*) (WI_ITEM_REC *)) exec_wi_destroy;
item->name = rec->name != NULL ?
g_strdup_printf("%%%s", rec->name) :
g_strdup_printf("%%%d", rec->id);
item->createtime = time(NULL);
item->process = rec;
MODULE_DATA_INIT(item);
window_item_add(window, (WI_ITEM_REC *) item, FALSE);
return item;
}
static int process_get_new_id(void)
{
PROCESS_REC *rec;
GSList *tmp;
int id;
id = 0;
tmp = processes;
while (tmp != NULL) {
rec = tmp->data;
if (id != rec->id) {
tmp = tmp->next;
continue;
}
id++;
tmp = processes;
}
return id;
}
static PROCESS_REC *process_find_pid(int pid)
{
GSList *tmp;
g_return_val_if_fail(pid > 0, NULL);
for (tmp = processes; tmp != NULL; tmp = tmp->next) {
PROCESS_REC *rec = tmp->data;
if (rec->pid == pid)
return rec;
}
return NULL;
}
static PROCESS_REC *process_find_id(int id, int verbose)
{
GSList *tmp;
g_return_val_if_fail(id != -1, NULL);
for (tmp = processes; tmp != NULL; tmp = tmp->next) {
PROCESS_REC *rec = tmp->data;
if (rec->id == id)
return rec;
}
if (verbose) {
printtext(NULL, NULL, MSGLEVEL_CLIENTERROR,
"Unknown process id: %d", id);
}
return NULL;
}
static PROCESS_REC *process_find(const char *name, int verbose)
{
GSList *tmp;
g_return_val_if_fail(name != NULL, NULL);
if (*name == '%' && is_numeric(name+1, 0))
return process_find_id(atoi(name+1), verbose);
for (tmp = processes; tmp != NULL; tmp = tmp->next) {
PROCESS_REC *rec = tmp->data;
if (rec->name != NULL && strcmp(rec->name, name) == 0)
return rec;
}
if (verbose) {
printtext(NULL, NULL, MSGLEVEL_CLIENTERROR,
"Unknown process name: %s", name);
}
return NULL;
}
static void process_destroy(PROCESS_REC *rec, int status)
{
processes = g_slist_remove(processes, rec);
signal_emit("exec remove", 2, rec, GINT_TO_POINTER(status));
if (rec->read_tag != -1)
g_source_remove(rec->read_tag);
if (rec->target_item != NULL)
exec_wi_destroy(rec->target_item);
line_split_free(rec->databuf);
g_io_channel_close(rec->in);
g_io_channel_unref(rec->in);
net_sendbuffer_destroy(rec->out, TRUE);
g_free_not_null(rec->name);
g_free_not_null(rec->target);
g_free(rec->args);
g_free(rec);
}
static void processes_killall(int signum)
{
GSList *tmp;
for (tmp = processes; tmp != NULL; tmp = tmp->next) {
PROCESS_REC *rec = tmp->data;
kill(rec->pid, signum);
}
}
static int signal_name_to_id(const char *name)
{
/* check only the few most common signals, too much job to check
them all. if we sometimes want more, procps-sources/proc/sig.c
would be useful for copypasting */
if (g_strcasecmp(name, "hup") == 0)
return SIGHUP;
if (g_strcasecmp(name, "int") == 0)
return SIGINT;
if (g_strcasecmp(name, "term") == 0)
return SIGTERM;
if (g_strcasecmp(name, "kill") == 0)
return SIGKILL;
if (g_strcasecmp(name, "usr1") == 0)
return SIGUSR1;
if (g_strcasecmp(name, "usr2") == 0)
return SIGUSR2;
return -1;
}
/* `optlist' should contain only one unknown key - the server tag.
returns NULL if there was unknown -option */
static int cmd_options_get_signal(const char *cmd,
GHashTable *optlist)
{
GSList *list, *tmp, *next;
char *signame;
int signum;
/* get all the options, then remove the known ones. there should
be only one left - the signal */
list = hashtable_get_keys(optlist);
if (cmd != NULL) {
for (tmp = list; tmp != NULL; tmp = next) {
char *option = tmp->data;
next = tmp->next;
if (command_have_option(cmd, option))
list = g_slist_remove(list, option);
}
}
if (list == NULL)
return -1;
signame = list->data;
signum = -1;
signum = is_numeric(signame, 0) ? atol(signame) :
signal_name_to_id(signame);
if (signum == -1 || list->next != NULL) {
/* unknown option (not a signal) */
signal_emit("error command", 2,
GINT_TO_POINTER(CMDERR_OPTION_UNKNOWN),
signum == -1 ? list->data : list->next->data);
signal_stop();
return -2;
}
g_slist_free(list);
return signum;
}
static void exec_show_list(void)
{
GSList *tmp;
for (tmp = processes; tmp != NULL; tmp = tmp->next) {
PROCESS_REC *rec = tmp->data;
printtext(NULL, NULL, MSGLEVEL_CLIENTCRAP,
"%d (%s): %s", rec->id, rec->name, rec->args);
}
}
static void process_exec(PROCESS_REC *rec, const char *cmd)
{
const char *shell_args[4] = { "/bin/sh", "-c", NULL, NULL };
char **args;
int in[2], out[2];
int n;
if (pipe(in) == -1)
return;
if (pipe(out) == -1)
return;
shell_args[2] = cmd;
rec->pid = fork();
if (rec->pid == -1) {
/* error */
close(in[0]); close(in[1]);
close(out[0]); close(out[1]);
return;
}
if (rec->pid != 0) {
/* parent process */
GIOChannel *outio = g_io_channel_unix_new(in[1]);
rec->in = g_io_channel_unix_new(out[0]);
rec->out = net_sendbuffer_create(outio, 0);
close(out[1]);
close(in[0]);
pidwait_add(rec->pid);
return;
}
/* child process, try to clean up everything */
setsid();
setuid(getuid());
setgid(getgid());
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_DFL);
putenv("TERM=tty");
/* set stdin, stdout and stderr */
dup2(in[0], STDIN_FILENO);
dup2(out[1], STDOUT_FILENO);
dup2(out[1], STDERR_FILENO);
/* don't let child see our files */
for (n = 3; n < 256; n++)
close(n);
if (rec->shell) {
execvp(shell_args[0], (char **) shell_args);
fprintf(stderr, "Exec: /bin/sh: %s\n", g_strerror(errno));
} else {
args = g_strsplit(cmd, " ", -1);
execvp(args[0], args);
fprintf(stderr, "Exec: %s: %s\n", args[0], g_strerror(errno));
}
_exit(-1);
}
static void sig_exec_input_reader(PROCESS_REC *rec)
{
char tmpbuf[512], *str;
unsigned int recvlen;
int err, ret;
g_return_if_fail(rec != NULL);
recvlen = 0;
err = g_io_channel_read(rec->in, tmpbuf,
sizeof(tmpbuf), &recvlen);
if (err != 0 && err != G_IO_ERROR_AGAIN && errno != EINTR)
recvlen = -1;
do {
ret = line_split(tmpbuf, recvlen, &str, &rec->databuf);
if (ret == -1) {
/* link to terminal closed? */
g_source_remove(rec->read_tag);
rec->read_tag = -1;
break;
}
if (ret > 0) {
signal_emit_id(signal_exec_input, 2, rec, str);
if (recvlen > 0) recvlen = 0;
}
} while (ret > 0);
}
static void handle_exec(const char *args, GHashTable *optlist,
WI_ITEM_REC *item)
{
PROCESS_REC *rec;
char *target, *level;
int notice, signum, interactive, target_nick, target_channel;
/* check that there's no unknown options. we allowed them
because signals can be used as options, but there should be
only one unknown option: the signal name/number. */
signum = cmd_options_get_signal("exec", optlist);
if (signum == -2)
return;
if (*args == '\0') {
exec_show_list();
return;
}
target = NULL;
notice = FALSE;
if (g_hash_table_lookup(optlist, "in") != NULL) {
rec = process_find(g_hash_table_lookup(optlist, "in"), TRUE);
if (rec != NULL) {
net_sendbuffer_send(rec->out, args, strlen(args));
net_sendbuffer_send(rec->out, "\n", 1);
}
return;
}
/* check if args is a process ID or name. if it's ID but not found,
complain about it and fail immediately */
rec = process_find(args, *args == '%');
if (*args == '%' && rec == NULL)
return;
/* common options */
target_channel = target_nick = FALSE;
if (g_hash_table_lookup(optlist, "out") != NULL) {
/* redirect output to active channel/query */
if (item == NULL)
cmd_return_error(CMDERR_NOT_JOINED);
target = item->name;
target_channel = IS_CHANNEL(item);
target_nick = IS_QUERY(item);
} else if (g_hash_table_lookup(optlist, "msg") != NULL) {
/* redirect output to /msg <nick> */
target = g_hash_table_lookup(optlist, "msg");
} else if (g_hash_table_lookup(optlist, "notice") != NULL) {
target = g_hash_table_lookup(optlist, "notice");
notice = TRUE;
}
/* options that require process ID/name as argument */
if (rec == NULL &&
(signum != -1 || g_hash_table_lookup(optlist, "close") != NULL)) {
printtext(NULL, NULL, MSGLEVEL_CLIENTERROR,
"Unknown process name: %s", args);
return;
}
if (g_hash_table_lookup(optlist, "close") != NULL) {
/* forcibly close the process */
process_destroy(rec, -1);
return;
}
if (signum != -1) {
/* send a signal to process */
kill(rec->pid, signum);
return;
}
interactive = g_hash_table_lookup(optlist, "interactive") != NULL;
if (*args == '%') {
/* do something to already existing process */
char *name;
if (target != NULL) {
/* redirect output to target */
g_free_and_null(rec->target);
rec->target = g_strdup(target);
rec->notice = notice;
}
name = g_hash_table_lookup(optlist, "name");
if (name != NULL) {
/* change window name */
g_free_not_null(rec->name);
rec->name = *name == '\0' ? NULL : g_strdup(name);
} else if (target == NULL &&
(rec->target_item == NULL || interactive)) {
/* no parameters given,
redirect output to the active window */
g_free_and_null(rec->target);
rec->target_win = active_win;
if (rec->target_item != NULL) {
exec_wi_destroy(rec->target_item);
rec->target_item = NULL;
}
if (interactive) {
rec->target_item =
exec_wi_create(active_win, rec);
}
}
return;
}
/* starting a new process */
rec = g_new0(PROCESS_REC, 1);
rec->pid = -1;
rec->shell = g_hash_table_lookup(optlist, "nosh") == NULL;
process_exec(rec, args);
if (rec->pid == -1) {
/* pipe() or fork() failed */
g_free(rec);
cmd_return_error(CMDERR_ERRNO);
}
rec->id = process_get_new_id();
rec->target = g_strdup(target);
rec->target_win = active_win;
rec->target_channel = target_channel;
rec->target_nick = target_nick;
rec->args = g_strdup(args);
rec->notice = notice;
rec->silent = g_hash_table_lookup(optlist, "-") != NULL;
rec->name = g_strdup(g_hash_table_lookup(optlist, "name"));
level = g_hash_table_lookup(optlist, "level");
rec->level = level == NULL ? MSGLEVEL_CLIENTCRAP : level2bits(level);
rec->read_tag = g_input_add(rec->in, G_INPUT_READ,
(GInputFunction) sig_exec_input_reader,
rec);
processes = g_slist_append(processes, rec);
if (rec->target == NULL && interactive)
rec->target_item = exec_wi_create(active_win, rec);
signal_emit("exec new", 1, rec);
}
/* SYNTAX: EXEC [-] [-nosh] [-out | -msg <target> | -notice <target>]
[-name <name>] <cmd line>
EXEC -out | -window | -msg <target> | -notice <target> |
-close | -<signal> <id>
EXEC -in <id> <text to send to process> */
static void cmd_exec(const char *data, SERVER_REC *server, WI_ITEM_REC *item)
{
GHashTable *optlist;
char *args;
void *free_arg;
g_return_if_fail(data != NULL);
if (cmd_get_params(data, &free_arg, 1 | PARAM_FLAG_OPTIONS |
PARAM_FLAG_UNKNOWN_OPTIONS | PARAM_FLAG_GETREST,
"exec", &optlist, &args)) {
handle_exec(args, optlist, item);
cmd_params_free(free_arg);
}
}
static void sig_pidwait(void *pid, void *statusp)
{
PROCESS_REC *rec;
char *str;
int status = GPOINTER_TO_INT(statusp);
rec = process_find_pid(GPOINTER_TO_INT(pid));
if (rec == NULL) return;
/* process exited - print the last line if
there wasn't a newline at end. */
if (line_split("\n", 1, &str, &rec->databuf) > 0 && *str != '\0')
signal_emit_id(signal_exec_input, 2, rec, str);
if (!rec->silent) {
if (WIFSIGNALED(status)) {
status = WTERMSIG(status);
printtext(NULL, NULL, MSGLEVEL_CLIENTNOTICE,
"process %d (%s) terminated with signal %d (%s)",
rec->id, rec->args,
status, g_strsignal(status));
} else {
status = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
printtext(NULL, NULL, MSGLEVEL_CLIENTNOTICE,
"process %d (%s) terminated with return code %d",
rec->id, rec->args, status);
}
}
process_destroy(rec, status);
}
static void sig_exec_input(PROCESS_REC *rec, const char *text)
{
WI_ITEM_REC *item;
SERVER_REC *server;
char *str;
item = NULL;
server = NULL;
if (rec->target != NULL) {
item = window_item_find(NULL, rec->target);
server = item != NULL ? item->server :
active_win->active_server;
str = g_strconcat(rec->target_nick ? "-nick " :
rec->target_channel ? "-channel " : "",
rec->target, " ", text, NULL);
signal_emit(rec->notice ? "command notice" : "command msg",
3, str, server, item);
g_free(str);
} else if (rec->target_item != NULL) {
printtext(NULL, rec->target_item->name,
rec->level, "%s", text);
} else {
printtext_window(rec->target_win, rec->level, "%s", text);
}
}
static void sig_window_destroyed(WINDOW_REC *window)
{
GSList *tmp;
/* window is being closed, if there's any /exec targets for it,
change them to active window. */
for (tmp = processes; tmp != NULL; tmp = tmp->next) {
PROCESS_REC *rec = tmp->data;
if (rec->target_win == window)
rec->target_win = active_win;
}
}
static void event_text(const char *data, SERVER_REC *server, EXEC_WI_REC *item)
{
if (!IS_EXEC_WI(item)) return;
net_sendbuffer_send(item->process->out, data, strlen(data));
net_sendbuffer_send(item->process->out, "\n", 1);
signal_stop();
}
void fe_exec_init(void)
{
command_bind("exec", NULL, (SIGNAL_FUNC) cmd_exec);
command_set_options("exec", "!- interactive nosh +name out +msg +notice +in window close +level");
signal_exec_input = signal_get_uniq_id("exec input");
signal_add("pidwait", (SIGNAL_FUNC) sig_pidwait);
signal_add("exec input", (SIGNAL_FUNC) sig_exec_input);
signal_add("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
signal_add_first("send text", (SIGNAL_FUNC) event_text);
}
void fe_exec_deinit(void)
{
if (processes != NULL) {
processes_killall(SIGTERM);
sleep(1);
processes_killall(SIGKILL);
while (processes != NULL)
process_destroy(processes->data, -1);
}
command_unbind("exec", (SIGNAL_FUNC) cmd_exec);
signal_remove("pidwait", (SIGNAL_FUNC) sig_pidwait);
signal_remove("exec input", (SIGNAL_FUNC) sig_exec_input);
signal_remove("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
signal_remove("send text", (SIGNAL_FUNC) event_text);
}