uhub/src/commands.c

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/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2009, Jan Vidar Krey
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "uhub.h"
typedef int (*command_handler)(struct hub_info* hub, struct user* user, const char* message);
struct commands_handler
{
const char* prefix;
size_t length;
enum user_credentials cred;
command_handler handler;
const char* description;
};
static struct commands_handler command_handlers[];
static void send_message(struct hub_info* hub, struct user* user, const char* message)
{
char* buffer = adc_msg_escape(message);
struct adc_message* command = adc_msg_construct(ADC_CMD_IMSG, strlen(buffer) + 6);
adc_msg_add_argument(command, buffer);
route_to_user(hub, user, command);
adc_msg_free(command);
hub_free(buffer);
}
static int command_access_denied(struct hub_info* hub, struct user* user, const char* command)
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{
char temp[128];
snprintf(temp, 128, "*** Access denied: \"%s\"", command);
send_message(hub, user, temp);
return 0;
}
static int command_not_found(struct hub_info* hub, struct user* user, const char* command)
{
char temp[128];
snprintf(temp, 128, "*** Command not found: \"%s\"", command);
send_message(hub, user, temp);
return 0;
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}
static int command_status(struct hub_info* hub, struct user* user, const char* command, const char* message)
{
char temp[1024];
snprintf(temp, 1024, "*** %s: %s", command, message);
send_message(hub, user, temp);
return 0;
}
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static int command_stats(struct hub_info* hub, struct user* user, const char* message)
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{
char temp[128];
snprintf(temp, 128, "%zu users, peak: %zu. Network (up/down): %d/%d KB/s, peak: %d/%d KB/s",
hub->users->count,
hub->users->count_peak,
(int) hub->stats.net_tx / 1024,
(int) hub->stats.net_rx / 1024,
(int) hub->stats.net_tx_peak / 1024,
(int) hub->stats.net_rx_peak / 1024);
return command_status(hub, user, "stats", message);
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}
static int command_help(struct hub_info* hub, struct user* user, const char* message)
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{
#define MAX_HELP_MSG 1024
size_t n;
char msg[MAX_HELP_MSG];
msg[0] = 0;
strcat(msg, "Available commands:\n");
for (n = 0; command_handlers[n].prefix; n++)
{
if (command_handlers[n].cred <= user->credentials)
{
strcat(msg, "!");
strcat(msg, command_handlers[n].prefix);
strcat(msg, " - ");
strcat(msg, command_handlers[n].description);
strcat(msg, "\n");
}
}
return command_status(hub, user, "help", msg);
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}
static int command_uptime(struct hub_info* hub, struct user* user, const char* message)
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{
char tmp[128];
size_t d;
size_t h;
size_t m;
size_t D = (size_t) difftime(time(0), hub->tm_started);
d = D / (24 * 3600);
D = D % (24 * 3600);
h = D / 3600;
D = D % 3600;
m = D / 60;
tmp[0] = 0;
if (d)
{
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strcat(tmp, uhub_itoa((int) d));
strcat(tmp, " day");
if (d != 1) strcat(tmp, "s");
strcat(tmp, ", ");
}
if (h < 10) strcat(tmp, "0");
strcat(tmp, uhub_itoa((int) h));
strcat(tmp, ":");
if (m < 10) strcat(tmp, "0");
strcat(tmp, uhub_itoa((int) m));
return command_status(hub, user, "uptime", tmp);
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}
static int command_kick(struct hub_info* hub, struct user* user, const char* message)
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{
if (strlen(message) < 7)
{
return command_status(hub, user, "kick", "No nickname given");
}
const char* nick = &message[7];
struct user* target = uman_get_user_by_nick(hub, nick);
if (!target)
{
return command_status(hub, user, "kick", "No such user");
}
if (target == user)
{
return command_status(hub, user, "kick", "Cannot kick yourself");
}
hub_disconnect_user(hub, target, quit_kicked);
return command_status(hub, user, "kick", nick);
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}
static int command_reload(struct hub_info* hub, struct user* user, const char* message)
{
hub->status = hub_status_restart;
return command_status(hub, user, "reload", "Reloading configuration...");
}
static int command_shutdown(struct hub_info* hub, struct user* user, const char* message)
{
hub->status = hub_status_shutdown;
return command_status(hub, user, "shutdown", "Hub shutting down...");
}
static int command_version(struct hub_info* hub, struct user* user, const char* message)
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{
return command_status(hub, user, "version", "Powered by " PRODUCT "/" VERSION);
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}
static int command_myip(struct hub_info* hub, struct user* user, const char* message)
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{
char tmp[128];
snprintf(tmp, 128, "Your IP is \"%s\"", ip_convert_to_string(&user->ipaddr));
return command_status(hub, user, "myip", tmp);
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}
int command_dipatcher(struct hub_info* hub, struct user* user, const char* message)
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{
size_t n = 0;
for (n = 0; command_handlers[n].prefix; n++)
{
if (!strncmp(&message[1], command_handlers[n].prefix, command_handlers[n].length))
{
if (command_handlers[n].cred <= user->credentials)
{
return command_handlers[n].handler(hub, user, message);
}
else
{
return command_access_denied(hub, user, command_handlers[n].prefix);
}
}
}
command_not_found(hub, user, message);
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return 1;
}
static struct commands_handler command_handlers[] = {
{ "help", 4, cred_guest, command_help, "Show this help message." },
{ "stats", 5, cred_super, command_stats, "Show hub statistics." },
{ "version", 7, cred_guest, command_version, "Show hub version info." },
{ "uptime", 6, cred_guest, command_uptime, "Display hub uptime info." },
{ "kick", 4, cred_operator, command_kick, "Kick a user" },
{ "reload", 6, cred_admin, command_reload, "Reload configuration files." },
{ "shutdown", 8, cred_admin, command_shutdown, "Shutdown hub." },
{ "myip", 4, cred_guest, command_myip, "Show your own IP." },
{ 0, 0, cred_none, command_help, "" }
};