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/* Copyright (C) 2021 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/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this Program, or any covered work, by linking or
* combining it with LibreSSL (or a modified version of that library),
* containing parts covered by the terms of the OpenSSL License and the
* original SSLeay license, the licensors of this Program grant you
* additional permission to convey the resulting work. Corresponding
* Source for a non-source form of such a combination shall include the
* source code for the parts of LibreSSL used as well as that of the
* covered work.
*/
#include <err.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sysexits.h>
#include <tls.h>
#include <unistd.h>
static bool verbose;
static struct tls *client;
static const char *chan;
static void clientWrite(const char *ptr, size_t len) {
if (verbose) printf("%.*s", (int)len, ptr);
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);
if ((size_t)len > sizeof(buf) - 1) errx(EX_DATAERR, "message too large");
clientWrite(buf, len);
}
static bool joined;
static bool reverse;
static void handle(char *line) {
char *tags = NULL;
char *origin = NULL;
if (line && line[0] == '@') tags = 1 + strsep(&line, " ");
if (line && line[0] == ':') origin = 1 + strsep(&line, " ");
char *cmd = strsep(&line, " ");
if (!cmd) return;
if (!strcmp(cmd, "CAP")) {
char *param = strsep(&cmd, " ");
if (!param) errx(EX_PROTOCOL, "CAP missing parameter");
if (!strcmp(param, "NAK")) {
errx(EX_CONFIG, "server does not support message-tags");
}
format("CAP END\r\n");
} else if (!strcmp(cmd, "001")) {
format("JOIN %s\r\n", chan);
joined = true;
} else if (!strcmp(cmd, "PING")) {
format("PONG %s\r\n", line);
} else if (reverse && !strcmp(cmd, "TAGMSG") && tags && origin) {
char *nick = strsep(&origin, "!");
if (strstr(tags, "typing=active")) {
format("PRIVMSG %s :\u2328\uFE0F %s is typing!\r\n", chan, nick);
} else if (strstr(tags, "typing=paused")) {
format("PRIVMSG %s :\U0001F914 %s is thinking!\r\n", chan, nick);
} else if (strstr(tags, "typing=done")) {
format("PRIVMSG %s :\u270B %s stopped typing!\r\n", chan, nick);
}
}
}
static void timer(int sig) {
(void)sig;
if (!joined) return;
const char *status = (arc4random_uniform(4) ? "active" : "done");
format(
"@+typing=%s;+draft/typing=%s TAGMSG %s\r\n",
status, status, chan
);
}
int main(int argc, char *argv[]) {
const char *host = NULL;
const char *port = "6697";
const char *cert = NULL;
const char *nick = "typer";
const char *user = "typer";
bool passive = false;
for (int opt; 0 < (opt = getopt(argc, argv, "PRc:n:p:u:v"));) {
switch (opt) {
break; case 'P': passive = true;
break; case 'R': reverse = true;
break; case 'c': cert = optarg;
break; case 'n': nick = optarg;
break; case 'p': port = optarg;
break; case 'u': user = optarg;
break; case 'v': verbose = true;
break; default: return EX_USAGE;
}
}
if (argc - optind < 2) errx(EX_USAGE, "host and chan required");
host = argv[optind];
chan = argv[optind + 1];
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");
if (cert) {
int error = tls_config_set_keypair_file(config, cert, cert);
if (error) errx(EX_CONFIG, "%s: %s", cert, tls_config_error(config));
}
int 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));
format(
"CAP REQ :message-tags%s\r\n"
"NICK %s\r\n"
"USER %s 0 * :typer\r\n",
(passive ? " causal.agency/passive" : ""),
nick, user
);
if (!reverse) {
signal(SIGALRM, timer);
struct itimerval itimer = {
.it_interval.tv_sec = 5,
.it_value.tv_sec = 5
};
error = setitimer(ITIMER_REAL, &itimer, NULL);
if (error) err(EX_OSERR, "setitimer");
}
size_t len = 0;
char buf[4096];
for (;;) {
ssize_t read = tls_read(client, &buf[len], sizeof(buf) - len);
if (read == TLS_WANT_POLLIN || read == TLS_WANT_POLLOUT) continue;
if (read < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
if (!read) errx(EX_UNAVAILABLE, "server disconnected");
len += read;
char *crlf;
char *line = buf;
for (;;) {
crlf = memmem(line, &buf[len] - line, "\r\n", 2);
if (!crlf) break;
crlf[0] = '\0';
if (verbose) printf("%s\n", line);
handle(line);
line = &crlf[2];
}
len -= line - buf;
memmove(buf, line, len);
}
}
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