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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 <err.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include "bounce.h"
enum { ISupportCap = 32 };
static struct {
char *origin;
char *nick;
char *welcome;
char *yourHost;
char *created;
char *myInfo[4];
struct {
char *values[ISupportCap];
size_t len;
} iSupport;
} state;
bool stateReady(void) {
return state.origin
&& state.nick
&& state.welcome
&& state.yourHost
&& state.created
&& state.myInfo[0]
&& state.iSupport.len;
}
static void set(char **field, const char *value) {
if (*field) free(*field);
*field = NULL;
if (value) {
*field = strdup(value);
if (!*field) err(EX_OSERR, "strdup");
}
}
enum { ParamCap = 15 };
struct Command {
const char *origin;
const char *name;
const char *target;
const char *params[ParamCap];
};
typedef void Handler(struct Command);
static void cap(struct Command cmd) {
bool ack = cmd.params[0] && !strcmp(cmd.params[0], "ACK");
bool sasl = cmd.params[1] && !strcmp(cmd.params[1], "sasl");
if (!ack || !sasl) errx(EX_CONFIG, "server does not support SASL");
serverAuth();
}
static void replyWelcome(struct Command cmd) {
set(&state.origin, cmd.origin);
set(&state.nick, cmd.target);
set(&state.welcome, cmd.params[0]);
}
static void replyYourHost(struct Command cmd) {
set(&state.yourHost, cmd.params[0]);
}
static void replyCreated(struct Command cmd) {
set(&state.created, cmd.params[0]);
}
static void replyMyInfo(struct Command cmd) {
set(&state.myInfo[0], cmd.params[0]);
set(&state.myInfo[1], cmd.params[1]);
set(&state.myInfo[2], cmd.params[2]);
set(&state.myInfo[3], cmd.params[3]);
}
static void replyISupport(struct Command cmd) {
for (size_t i = 0; i < ParamCap; ++i) {
if (!cmd.params[i] || strchr(cmd.params[i], ' ')) break;
if (state.iSupport.len == ISupportCap) break;
set(&state.iSupport.values[state.iSupport.len++], cmd.params[i]);
}
}
static const struct {
const char *cmd;
Handler *fn;
} Handlers[] = {
{ "001", replyWelcome },
{ "002", replyYourHost },
{ "003", replyCreated },
{ "004", replyMyInfo },
{ "005", replyISupport },
{ "CAP", cap },
};
static const size_t HandlersLen = sizeof(Handlers) / sizeof(Handlers[0]);
void stateParse(char *line) {
struct Command cmd = {0};
if (line[0] == ':') {
cmd.origin = 1 + strsep(&line, " ");
if (!line) errx(EX_PROTOCOL, "eof after origin");
}
cmd.name = strsep(&line, " ");
cmd.target = strsep(&line, " ");
for (size_t i = 0; line && i < ParamCap; ++i) {
if (line[0] == ':') {
cmd.params[i] = line;
break;
}
cmd.params[i] = strsep(&line, " ");
}
for (size_t i = 0; i < HandlersLen; ++i) {
if (strcmp(cmd.name, Handlers[i].cmd)) continue;
Handlers[i].fn(cmd);
break;
}
}
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