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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 struct {
char *origin;
char *welcome;
char *yourHost;
char *created;
char *myInfo[4];
} intro;
static struct {
char *nick;
char *origin;
} self;
static void set(char **field, const char *value) {
if (*field) free(*field);
*field = strdup(value);
if (!*field) err(EX_OSERR, "strdup");
}
static struct {
char **names;
size_t cap, len;
} chan;
static void chanAdd(const char *name) {
if (chan.len == chan.cap) {
chan.cap = (chan.cap ? chan.cap * 2 : 8);
chan.names = realloc(chan.names, sizeof(char *) * chan.cap);
if (!chan.names) err(EX_OSERR, "realloc");
}
chan.names[chan.len] = strdup(name);
if (!chan.names[chan.len]) err(EX_OSERR, "strdup");
chan.len++;
}
static void chanRemove(const char *name) {
for (size_t i = 0; i < chan.len; ++i) {
if (strcmp(chan.names[i], name)) continue;
free(chan.names[i]);
chan.names[i] = chan.names[--chan.len];
return;
}
}
static struct {
char **tokens;
size_t cap, len;
} support;
static void supportAdd(const char *token) {
if (support.len == support.cap) {
support.cap = (support.cap ? support.cap * 2 : 8);
support.tokens = realloc(support.tokens, sizeof(char *) * support.cap);
if (!support.tokens) err(EX_OSERR, "realloc");
}
support.tokens[support.len] = strdup(token);
if (!support.tokens[support.len]) err(EX_OSERR, "strdup");
support.len++;
}
bool stateReady(void) {
return self.nick
&& intro.origin
&& intro.welcome
&& intro.yourHost
&& intro.created
&& intro.myInfo[0]
&& support.len;
}
typedef void Handler(struct Message *msg);
static void handleCap(struct Message *msg) {
bool ack = msg->params[1] && !strcmp(msg->params[1], "ACK");
bool sasl = msg->params[2] && !strncmp(msg->params[2], "sasl", 4);
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(&self.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;
supportAdd(msg->params[i]);
}
}
static bool fromSelf(const struct Message *msg) {
if (!self.nick) return false;
size_t len = strlen(self.nick);
if (strlen(msg->origin) < len) return false;
if (strncmp(msg->origin, self.nick, len)) return false;
if (msg->origin[len] != '!') return false;
if (!self.origin || strcmp(self.origin, msg->origin)) {
set(&self.origin, msg->origin);
}
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 nick");
if (fromSelf(msg)) set(&self.nick, msg->params[0]);
}
static void handleJoin(struct Message *msg) {
if (!msg->origin) errx(EX_PROTOCOL, "JOIN without origin");
if (!msg->params[0]) errx(EX_PROTOCOL, "JOIN without channel");
if (fromSelf(msg)) chanAdd(msg->params[0]);
}
static void handlePart(struct Message *msg) {
if (!msg->origin) errx(EX_PROTOCOL, "PART without origin");
if (!msg->params[0]) errx(EX_PROTOCOL, "PART without channel");
if (fromSelf(msg)) chanRemove(msg->params[0]);
}
static void handleKick(struct Message *msg) {
if (!msg->params[0]) errx(EX_PROTOCOL, "KICK without channel");
if (!msg->params[1]) errx(EX_PROTOCOL, "KICK without nick");
if (self.nick && !strcmp(msg->params[1], self.nick)) {
chanRemove(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 },
{ "JOIN", handleJoin },
{ "KICK", handleKick },
{ "NICK", handleNick },
{ "PART", handlePart },
};
void stateParse(char *line) {
struct Message msg = parse(line);
if (!msg.cmd) return;
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) {
assert(stateReady());
clientFormat(
client,
":%s 001 %s :%s\r\n"
":%s 002 %s :%s\r\n"
":%s 003 %s :%s\r\n",
intro.origin, self.nick, intro.welcome,
intro.origin, self.nick, intro.yourHost,
intro.origin, self.nick, intro.created
);
clientFormat(
client, ":%s 004 %s %s %s %s %s\r\n",
intro.origin, self.nick,
intro.myInfo[0], intro.myInfo[1], intro.myInfo[2], intro.myInfo[3]
);
size_t i;
for (i = 0; support.len - i >= 13; i += 13) {
clientFormat(
client,
":%s 005 %s"
" %s %s %s %s %s %s %s %s %s %s %s %s %s"
" :are supported by this server\r\n",
intro.origin, self.nick,
support.tokens[i + 0], support.tokens[i + 1],
support.tokens[i + 2], support.tokens[i + 3],
support.tokens[i + 4], support.tokens[i + 5],
support.tokens[i + 6], support.tokens[i + 7],
support.tokens[i + 8], support.tokens[i + 9],
support.tokens[i + 10], support.tokens[i + 11],
support.tokens[i + 12]
);
}
if (i < support.len) {
clientFormat(client, ":%s 005 %s", intro.origin, self.nick);
for (; i < support.len; ++i) {
clientFormat(client, " %s", support.tokens[i]);
}
clientFormat(client, " :are supported by this server\r\n");
}
if (chan.len) assert(self.origin);
for (size_t i = 0; i < chan.len; ++i) {
clientFormat(client, ":%s JOIN %s\r\n", self.origin, chan.names[i]);
}
}
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