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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 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 <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <err.h>
#include <sqlite3.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <tls.h>
#include <unistd.h>
#include "database.h"
static sqlite3 *db;
static struct tls *client;
static bool verbose;
static void writeAll(const char *ptr, size_t len) {
while (len) {
ssize_t ret = tls_write(client, ptr, len);
if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) continue;
if (ret < 0) errx(EX_IOERR, "tls_write: %s", tls_error(client));
ptr += ret;
len -= ret;
}
}
static void format(const char *format, ...) {
char buf[1024];
va_list ap;
va_start(ap, format);
int len = vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
assert((size_t)len < sizeof(buf));
if (verbose) printf("%s", buf);
writeAll(buf, len);
}
enum { ParamCap = 15 };
struct Message {
char *time;
char *nick;
char *user;
char *host;
char *cmd;
char *params[ParamCap];
};
static struct Message parse(char *line) {
if (verbose) fprintf(stderr, "%s\n", line);
struct Message msg = {0};
if (line[0] == '@') {
char *tags = 1 + strsep(&line, " ");
while (tags) {
char *tag = strsep(&tags, ";");
char *key = strsep(&tag, "=");
if (!strcmp(key, "time")) msg.time = tag;
}
}
if (line[0] == ':') {
char *origin = 1 + strsep(&line, " ");
msg.nick = strsep(&origin, "!");
msg.user = strsep(&origin, "@");
if (origin) {
msg.host = origin;
} else {
msg.host = msg.nick;
msg.nick = NULL;
}
}
msg.cmd = strsep(&line, " ");
for (size_t i = 0; line && i < ParamCap; ++i) {
if (line[0] == ':') {
msg.params[i] = &line[1];
break;
}
msg.params[i] = strsep(&line, " ");
}
return msg;
}
typedef void Handler(struct Message *msg);
static void handleCap(struct Message *msg) {
(void)msg;
format("CAP END\r\n");
}
static void handlePing(struct Message *msg) {
// TODO: Require params[0].
format("PONG :%s\r\n", msg->params[0]);
}
static const struct {
const char *cmd;
Handler *fn;
} Handlers[] = {
{ "CAP", handleCap },
{ "PING", handlePing },
};
static void handle(struct Message msg) {
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;
}
}
int main(int argc, char *argv[]) {
char *path = NULL;
bool init = false;
bool migrate = false;
bool insecure = false;
const char *host = NULL;
const char *port = "6697";
const char *nick = "litterbox";
const char *user = NULL;
const char *pass = NULL;
int opt;
while (0 < (opt = getopt(argc, argv, "!d:h:imn:p:u:vw:"))) {
switch (opt) {
break; case '!': insecure = true;
break; case 'd': path = optarg;
break; case 'h': host = optarg;
break; case 'i': init = true;
break; case 'm': migrate = true;
break; case 'n': nick = optarg;
break; case 'p': port = optarg;
break; case 'u': user = optarg;
break; case 'v': verbose = true;
break; case 'w': pass = optarg;
break; default: return EX_USAGE;
}
}
if (!user) user = nick;
int flags = SQLITE_OPEN_READWRITE;
if (init) flags |= SQLITE_OPEN_CREATE;
db = (path ? dbOpen(path, flags) : dbFind(flags));
if (!db) errx(EX_NOINPUT, "database not found");
if (init) {
dbInit(db);
return EX_OK;
}
if (migrate) {
dbMigrate(db);
return EX_OK;
}
if (dbVersion(db) != DatabaseVersion) {
errx(EX_CONFIG, "database out of date; migrate with -m");
}
if (!host) errx(EX_USAGE, "host required");
client = tls_client();
if (!client) errx(EX_SOFTWARE, "tls_client");
struct tls_config *config = tls_config_new();
if (!config) errx(EX_SOFTWARE, "tls_config_new");
int error = tls_config_set_ciphers(config, "compat");
if (error) {
errx(EX_SOFTWARE, "tls_config_set_ciphers: %s", tls_config_error(config));
}
if (insecure) {
tls_config_insecure_noverifycert(config);
tls_config_insecure_noverifyname(config);
}
error = tls_configure(client, config);
if (error) errx(EX_SOFTWARE, "tls_configure: %s", tls_error(client));
tls_config_free(config);
error = tls_connect(client, host, port);
if (error) errx(EX_UNAVAILABLE, "tls_connect: %s", tls_error(client));
if (pass) format("PASS :%s\r\n", pass);
format("CAP REQ :server-time\r\n");
format("NICK :%s\r\nUSER %s 0 * :Litterbox\r\n", nick, user);
char buf[8191 + 512];
size_t len = 0;
for (;;) {
ssize_t ret = tls_read(client, &buf[len], sizeof(buf) - len);
if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) continue;
if (ret < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
len += ret;
char *line = buf;
for (;;) {
char *crlf = memmem(line, &buf[len] - line, "\r\n", 2);
if (!crlf) break;
crlf[0] = '\0';
handle(parse(line));
line = crlf + 2;
}
len -= line - buf;
memmove(buf, line, len);
}
}
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