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/* Copyright (C) 2019 June 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 <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/event.h>
#include <sys/socket.h>
#include <sysexits.h>
#include <unistd.h>
typedef unsigned uint;
__attribute__((format(printf, 2, 3)))
static int pdprintf(int fd, const char *format, ...) {
va_list ap;
va_start(ap, format);
vprintf(format, ap);
va_end(ap);
va_start(ap, format);
int len = vdprintf(fd, format, ap);
va_end(ap);
return len;
}
int main(int argc, char *argv[]) {
int error;
const char *host = NULL;
const char *port = "6667";
const char *nick = "pingbot";
const char *join = NULL;
uint timeout = 120;
uint delay = 30;
int opt;
while (0 < (opt = getopt(argc, argv, "d:j:n:p:t:"))) {
switch (opt) {
break; case 'd': delay = strtoul(optarg, NULL, 0);
break; case 'j': join = optarg;
break; case 'n': nick = optarg;
break; case 'p': port = optarg;
break; case 't': timeout = strtoul(optarg, NULL, 0);
break; default: return EX_USAGE;
}
}
if (optind < argc) host = argv[optind];
if (!host || !timeout) return EX_USAGE;
struct addrinfo *head;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP,
};
error = getaddrinfo(host, port, &hints, &head);
if (error) errx(EX_NOHOST, "getaddrinfo: %s", gai_strerror(error));
int client = -1;
struct addrinfo *ai;
for (ai = head; ai; ai = ai->ai_next) {
client = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (client < 0) err(EX_OSERR, "socket");
error = connect(client, ai->ai_addr, ai->ai_addrlen);
if (!error) break;
close(client);
client = -1;
}
if (client < 0) err(EX_UNAVAILABLE, "connect");
error = pdprintf(client, "NICK %1$s\r\nUSER %1$s 0 * :%1$s\r\n", nick);
if (error < 0) err(EX_IOERR, "pdprintf");
int kq = kqueue();
if (kq < 0) err(EX_OSERR, "kqueue");
struct kevent event;
EV_SET(&event, client, EVFILT_READ, EV_ADD, 0, 0, 0);
int nevents = kevent(kq, &event, 1, NULL, 0, NULL);
if (nevents < 0) err(EX_OSERR, "kevent");
char buf[4096];
size_t len = 0;
bool pong = true;
for (;;) {
nevents = kevent(kq, NULL, 0, &event, 1, NULL);
if (nevents < 0) err(EX_IOERR, "kevent");
if (event.filter == EVFILT_TIMER) {
char *ping = event.udata;
if (pong) {
error = pdprintf(client, "PONG %s\r\n", ping);
if (error < 0) err(EX_IOERR, "pdprintf");
}
pong = true;
free(ping);
continue;
}
ssize_t rlen = read(client, &buf[len], sizeof(buf) - len);
if (rlen < 0) err(EX_IOERR, "read");
len += (size_t)rlen;
char *crlf;
char *line = buf;
while (NULL != (crlf = strnstr(line, "\r\n", &buf[len] - line))) {
crlf[0] = '\0';
printf("%s\n", line);
if (line[0] == ':') strsep(&line, " ");
if (!line) errx(EX_PROTOCOL, "unexpected eol");
char *cmd = strsep(&line, " ");
if (!strcmp(cmd, "001") && join) {
error = pdprintf(client, "JOIN :%s\r\n", join);
if (error < 0) err(EX_IOERR, "pdprintf");
} else if (!strcmp(cmd, "PING")) {
EV_SET(
&event, 0, EVFILT_TIMER, EV_ADD | EV_ONESHOT,
NOTE_SECONDS, timeout - 1, strdup(line)
);
nevents = kevent(kq, &event, 1, NULL, 0, NULL);
if (nevents < 0) err(EX_OSERR, "kevent");
} else if (!strcmp(cmd, "PRIVMSG") && strcasestr(line, nick)) {
pong = false;
} else if (!strcmp(cmd, "ERROR")) {
close(client);
sleep(delay);
client = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (client < 0) err(EX_OSERR, "socket");
error = connect(client, ai->ai_addr, ai->ai_addrlen);
if (error) err(EX_UNAVAILABLE, "connect");
error = pdprintf(
client, "NICK %1$s\r\nUSER %1$s 0 * :%1$s\r\n", nick
);
if (error < 0) err(EX_IOERR, "pdprintf");
EV_SET(&event, client, EVFILT_READ, EV_ADD, 0, 0, 0);
int nevents = kevent(kq, &event, 1, NULL, 0, NULL);
if (nevents < 0) err(EX_OSERR, "kevent");
}
line = &crlf[2];
}
len -= line - buf;
memmove(buf, line, len);
}
}
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