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/*
* Copyright (c) 2026 Nakidai Perumenei <nakidai at disroot dot 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 "ircd.h"
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#define ensure(cond, iffalse, doexit) if (!(cond)) { iffalse; if (doexit >= 0) return doexit; }
static int
nick(struct Message *msg, struct Peer *peer)
{
ensure(msg->params[0] && msg->params[0], writef(
peer->fd,
":%s 431 %s :No nickname given",
hostname,
getnick(peer)
), 0);
user_reg(peer, msg->params[0], NULL, NULL);
return 0;
}
static int
privmsg(struct Message *msg, struct Peer *peer)
{
size_t i;
ensure(peer->type, writef(
peer->fd,
":%s 451 %s :You have not registered",
hostname,
getnick(peer)
), 0);
ensure(msg->params[0] && *msg->params[0], writef(
peer->fd,
":%s 411 %s :No recipient given (PRIVMSG)",
hostname,
getnick(peer)
), 0);
ensure(msg->params[1] && *msg->params[1], writef(
peer->fd,
":%s 412 %s :No text to send",
hostname,
getnick(peer)
), 0);
/* TODO: implement channels */
ensure(!strchr("!+#&", *msg->params[0]), writef(
peer->fd,
":%s 421 %s :Channels are not supported yet",
hostname,
getnick(peer)
), 0);
/* TODO: implement server-to-server communication */
for (i = 0; i < PEERS_MAX; ++i)
if (peers[i].type == CLIENT && !strcmp(peers[i].nick, msg->params[0]))
writef(
peers[i].fd,
":%s!%s@%s PRIVMSG %s :%s",
peer->nick,
peer->user,
peer->host,
peer->nick,
msg->params[1]
);
return 0;
}
static int
quit(struct Message *msg, struct Peer *peer)
{
return 1;
}
static int
user(struct Message *msg, struct Peer *peer)
{
size_t i;
ensure(!peer->type, writef(
peer->fd,
":%s 462 %s :Unauthorized command (already registered)",
hostname,
getnick(peer)
), 0);
for (i = 0; i < 4; ++i)
ensure(msg->params[i] && *msg->params[i], writef(
peer->fd,
":%s 461 %s %s :Not enough parameters",
hostname,
getnick(peer),
msg->command
), 0);
user_reg(peer, NULL, msg->params[0], msg->params[3]);
return 0;
}
static int
default_handler(struct Message *msg, struct Peer *peer)
{
ensure(peer->type, 0, 0);
writef(peer->fd, ":%s 421 %s %s :Unknown command", hostname, getnick(peer), msg->command);
return 0;
}
static struct Handler {
const char *name;
Handler *handler;
} handlers[] =
{
{ "nick", nick },
{ "privmsg", privmsg },
{ "quit", quit },
{ "user", user },
};
Handler *
find(const char *command)
{
struct Handler *l, *m, *r;
int res;
l = handlers;
r = handlers + lengthof(handlers) - 1;
while (l <= r)
{
m = l + (r - l) / 2;
res = strcmp(command, m->name);
if (res > 0)
l = ++m;
else if (res < 0)
r = --m;
else
return m->handler;
}
return default_handler;
}
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