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/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include "bounce.h"
static char *nick;
// TODO: Channels.
static struct {
char *origin;
char *welcome;
char *yourHost;
char *created;
char *myInfo[4];
} intro;
enum { SupportCap = 32 };
static struct {
char *tokens[SupportCap];
size_t len;
} support;
bool stateReady(void) {
return nick
&& intro.origin
&& intro.welcome
&& intro.yourHost
&& intro.created
&& intro.myInfo[0]
&& support.len;
}
static void set(char **field, const char *value) {
if (*field) free(*field);
*field = strdup(value);
if (!*field) err(EX_OSERR, "strdup");
}
static void supportSet(const char *token) {
if (support.len == SupportCap) {
warnx("dropping ISUPPORT token %s", token);
return;
}
set(&support.tokens[support.len++], token);
}
typedef void Handler(struct Message);
static void handleCap(struct Message msg) {
bool ack = msg.params[1] && !strcmp(msg.params[1], "ACK");
bool sasl = msg.params[2] && !strcmp(msg.params[2], "sasl");
if (!ack || !sasl) errx(EX_CONFIG, "server does not support SASL");
serverAuth();
}
static void handleReplyWelcome(struct Message msg) {
if (!msg.params[1]) errx(EX_PROTOCOL, "RPL_WELCOME without message");
set(&intro.origin, msg.origin);
set(&nick, msg.params[0]);
set(&intro.welcome, msg.params[1]);
}
static void handleReplyYourHost(struct Message msg) {
if (!msg.params[1]) errx(EX_PROTOCOL, "RPL_YOURHOST without message");
set(&intro.yourHost, msg.params[1]);
}
static void handleReplyCreated(struct Message msg) {
if (!msg.params[1]) errx(EX_PROTOCOL, "RPL_CREATED without message");
set(&intro.created, msg.params[1]);
}
static void handleReplyMyInfo(struct Message msg) {
if (!msg.params[4]) errx(EX_PROTOCOL, "RPL_MYINFO without 4 parameters");
set(&intro.myInfo[0], msg.params[1]);
set(&intro.myInfo[1], msg.params[2]);
set(&intro.myInfo[2], msg.params[3]);
set(&intro.myInfo[3], msg.params[4]);
}
static void handleReplyISupport(struct Message msg) {
for (size_t i = 1; i < ParamCap; ++i) {
if (!msg.params[i] || strchr(msg.params[i], ' ')) break;
supportSet(msg.params[i]);
}
}
static bool self(struct Message msg) {
assert(nick);
size_t len = strlen(nick);
if (strncmp(msg.origin, nick, len)) return false;
if (strlen(msg.origin) < len || msg.origin[len] != '!') return false;
return true;
}
static void handleNick(struct Message msg) {
if (!msg.origin) errx(EX_PROTOCOL, "NICK without origin");
if (!msg.params[0]) errx(EX_PROTOCOL, "NICK without new nick");
if (self(msg)) set(&nick, msg.params[0]);
}
static void handleError(struct Message msg) {
errx(EX_UNAVAILABLE, "%s", msg.params[0]);
}
static const struct {
const char *cmd;
Handler *fn;
} Handlers[] = {
{ "001", handleReplyWelcome },
{ "002", handleReplyYourHost },
{ "003", handleReplyCreated },
{ "004", handleReplyMyInfo },
{ "005", handleReplyISupport },
{ "CAP", handleCap },
{ "ERROR", handleError },
{ "NICK", handleNick },
};
void stateParse(char *line) {
struct Message msg = parse(line);
if (!msg.cmd) errx(EX_PROTOCOL, "no command");
for (size_t i = 0; i < ARRAY_LEN(Handlers); ++i) {
if (strcmp(msg.cmd, Handlers[i].cmd)) continue;
Handlers[i].fn(msg);
break;
}
}
void stateSync(struct Client *client) {
char buf[4096];
int len = snprintf(
buf, sizeof(buf),
":%s 001 %s :%s\r\n"
":%s 002 %s :%s\r\n"
":%s 003 %s :%s\r\n"
":%s 004 %s %s %s %s %s\r\n",
intro.origin, nick, intro.welcome,
intro.origin, nick, intro.yourHost,
intro.origin, nick, intro.created,
intro.origin, nick,
intro.myInfo[0], intro.myInfo[1], intro.myInfo[2], intro.myInfo[3]
);
assert(len > 0 && (size_t)len < sizeof(buf));
// TODO: Send ISUPPORT.
clientSend(client, buf, len);
}
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