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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 <netdb.h>
#include <netinet/in.h>
#include <poll.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sysexits.h>
#include <tls.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <sys/capsicum.h>
#endif
static void clientWrite(struct tls *client, 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 clientFormat(struct tls *client, 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(client, buf, len);
}
static void clientHandle(struct tls *client, const char *chan, char *line) {
char *prefix = NULL;
if (line[0] == ':') {
prefix = strsep(&line, " ") + 1;
if (!line) errx(EX_PROTOCOL, "unexpected eol");
}
char *command = strsep(&line, " ");
if (!strcmp(command, "001") || !strcmp(command, "INVITE")) {
clientFormat(client, "JOIN :%s\r\n", chan);
} else if (!strcmp(command, "PING")) {
clientFormat(client, "PONG %s\r\n", line);
}
if (strcmp(command, "PRIVMSG") && strcmp(command, "NOTICE")) return;
if (!prefix) errx(EX_PROTOCOL, "message without prefix");
char *nick = strsep(&prefix, "!");
if (!line) errx(EX_PROTOCOL, "message without destination");
char *dest = strsep(&line, " ");
if (strcmp(dest, chan)) return;
if (!line || line[0] != ':') errx(EX_PROTOCOL, "message without message");
line = &line[1];
if (!strncmp(line, "\1ACTION ", 8)) {
line = &line[8];
size_t len = strcspn(line, "\1");
printf("* %c\u200C%s %.*s\n", nick[0], &nick[1], (int)len, line);
} else if (command[0] == 'N') {
printf("-%c\u200C%s- %s\n", nick[0], &nick[1], line);
} else {
printf("<%c\u200C%s> %s\n", nick[0], &nick[1], line);
}
}
int main(int argc, char *argv[]) {
int error;
if (argc < 5) return EX_USAGE;
const char *host = argv[1];
const char *port = argv[2];
const char *nick = argv[3];
const char *chan = argv[4];
setlinebuf(stdout);
struct tls_config *config = tls_config_new();
if (!config) errx(EX_SOFTWARE, "tls_config_new");
error = tls_config_set_ciphers(config, "compat");
if (error) {
errx(EX_SOFTWARE, "tls_config_set_ciphers: %s", tls_config_error(config));
}
struct tls *client = tls_client();
if (!client) errx(EX_SOFTWARE, "tls_client");
error = tls_configure(client, config);
if (error) errx(EX_SOFTWARE, "tls_configure: %s", tls_error(client));
tls_config_free(config);
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 sock = -1;
for (struct addrinfo *ai = head; ai; ai = ai->ai_next) {
sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock < 0) err(EX_OSERR, "socket");
error = connect(sock, ai->ai_addr, ai->ai_addrlen);
if (!error) break;
close(sock);
sock = -1;
}
if (sock < 0) err(EX_UNAVAILABLE, "connect");
freeaddrinfo(head);
error = tls_connect_socket(client, sock, host);
if (error) errx(EX_PROTOCOL, "tls_connect: %s", tls_error(client));
#ifdef __FreeBSD__
cap_rights_t rights;
error = cap_enter();
if (error) err(EX_OSERR, "cap_enter");
cap_rights_init(&rights, CAP_READ, CAP_EVENT);
error = cap_rights_limit(STDIN_FILENO, &rights);
if (error) err(EX_OSERR, "cap_rights_limit");
cap_rights_init(&rights, CAP_WRITE);
error = cap_rights_limit(STDOUT_FILENO, &rights);
if (error) err(EX_OSERR, "cap_rights_limit");
error = cap_rights_limit(STDERR_FILENO, &rights);
if (error) err(EX_OSERR, "cap_rights_limit");
cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_EVENT);
error = cap_rights_limit(sock, &rights);
if (error) err(EX_OSERR, "cap_rights_limit");
#endif
clientFormat(client, "NICK :%s\r\nUSER %s 0 * :%s\r\n", nick, nick, nick);
char *input = NULL;
size_t cap = 0;
char buf[4096];
size_t len = 0;
struct pollfd fds[2] = {
{ .events = POLLIN, .fd = STDIN_FILENO },
{ .events = POLLIN, .fd = sock },
};
while (0 < poll(fds, 2, -1)) {
if (fds[0].revents) {
ssize_t len = getline(&input, &cap, stdin);
if (len < 0) err(EX_IOERR, "getline");
input[len - 1] = '\0';
clientFormat(client, "NOTICE %s :%s\r\n", chan, input);
}
if (!fds[1].revents) continue;
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) return EX_UNAVAILABLE;
len += read;
char *crlf;
char *line = buf;
for (;;) {
crlf = memmem(line, &buf[len] - line, "\r\n", 2);
if (!crlf) break;
crlf[0] = '\0';
clientHandle(client, chan, line);
line = &crlf[2];
}
len -= line - buf;
memmove(buf, line, len);
}
err(EX_IOERR, "poll");
}
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