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/* Copyright (C) 2018 Curtis 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 <fcntl.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>
#include "chat.h"
static int connectRace(const char *host, const char *port) {
int error;
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));
nfds_t len = 0;
enum { SocksLen = 16 };
struct pollfd socks[SocksLen];
for (struct addrinfo *ai = head; ai; ai = ai->ai_next) {
if (len == SocksLen) break;
socks[len].events = POLLOUT;
socks[len].fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (socks[len].fd < 0) err(EX_OSERR, "socket");
error = fcntl(socks[len].fd, F_SETFL, O_NONBLOCK);
if (error) err(EX_OSERR, "fcntl");
error = connect(socks[len].fd, ai->ai_addr, ai->ai_addrlen);
if (error && errno != EINPROGRESS && errno != EINTR) {
close(socks[len].fd);
continue;
}
len++;
}
if (!len) err(EX_UNAVAILABLE, "connect");
freeaddrinfo(head);
int ready = poll(socks, len, -1);
if (ready < 0) err(EX_IOERR, "poll");
int sock = -1;
for (nfds_t i = 0; i < len; ++i) {
if ((socks[i].revents & POLLOUT) && sock < 0) {
sock = socks[i].fd;
} else {
close(socks[i].fd);
}
}
if (sock < 0) errx(EX_UNAVAILABLE, "no socket became writable");
error = fcntl(sock, F_SETFL, 0);
if (error) err(EX_IOERR, "fcntl");
return sock;
}
static struct tls *client;
static void webirc(const char *pass) {
const char *ssh = getenv("SSH_CLIENT");
if (!ssh) return;
int len = strlen(ssh);
const char *sp = strchr(ssh, ' ');
if (sp) len = sp - ssh;
ircFmt(
"WEBIRC %s %s %.*s %.*s\r\n",
pass, self.user, len, ssh, len, ssh
);
}
int ircConnect(
const char *host, const char *port, const char *pass, const char *webPass
) {
int error;
struct tls_config *config = tls_config_new();
error = tls_config_set_ciphers(config, "compat");
if (error) errx(EX_SOFTWARE, "tls_config: %s", tls_config_error(config));
client = tls_client();
if (!client) errx(EX_SOFTWARE, "tls_client");
error = tls_configure(client, config);
if (error) errx(EX_SOFTWARE, "tls_configure");
tls_config_free(config);
int sock = connectRace(host, port);
error = fcntl(sock, F_SETFD, FD_CLOEXEC);
if (error) err(EX_IOERR, "fcntl");
error = tls_connect_socket(client, sock, host);
if (error) errx(EX_PROTOCOL, "tls_connect: %s", tls_error(client));
if (webPass) webirc(webPass);
if (pass) ircFmt("PASS :%s\r\n", pass);
ircFmt("NICK %s\r\n", self.nick);
ircFmt("USER %s 0 * :%s\r\n", self.user, self.nick);
return sock;
}
void ircWrite(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;
}
}
void ircFmt(const char *format, ...) {
char *buf;
va_list ap;
va_start(ap, format);
int len = vasprintf(&buf, format, ap);
va_end(ap);
if (!buf) err(EX_OSERR, "vasprintf");
if (self.verbose) {
uiFmt(
TagVerbose, UICold,
"\3%d<<<\3 %.*s", IRCWhite, len - 2, buf
);
}
ircWrite(buf, len);
free(buf);
}
void ircRead(void) {
static char buf[4096];
static size_t len;
ssize_t read = tls_read(client, &buf[len], sizeof(buf) - len);
if (read < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
if (!read) {
uiExit();
exit(EX_OK);
}
len += read;
char *crlf, *line = buf;
while ((crlf = strnstr(line, "\r\n", &buf[len] - line))) {
crlf[0] = '\0';
if (self.verbose) {
uiFmt(
TagVerbose, UICold,
"\3%d>>>\3 %s", IRCGray, line
);
}
handle(line);
line = &crlf[2];
}
len -= line - buf;
memmove(buf, line, len);
}
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