130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <err.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <tls.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include "chat.h"
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static struct tls *client;
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static void webirc(const char *pass) {
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const char *ssh = getenv("SSH_CLIENT");
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if (!ssh) return;
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int len = strlen(ssh);
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const char *sp = strchr(ssh, ' ');
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if (sp) len = sp - ssh;
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clientFmt(
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"WEBIRC %s %s %.*s %.*s\r\n",
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pass, chat.user, len, ssh, len, ssh
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);
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}
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int clientConnect(const char *host, const char *port, const char *webPass) {
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int error;
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struct tls_config *config = tls_config_new();
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error = tls_config_set_ciphers(config, "compat");
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if (error) errx(EX_SOFTWARE, "tls_config: %s", tls_config_error(config));
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client = tls_client();
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if (!client) errx(EX_SOFTWARE, "tls_client");
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error = tls_configure(client, config);
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if (error) errx(EX_SOFTWARE, "tls_configure");
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tls_config_free(config);
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struct addrinfo *ai;
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struct addrinfo hints = {
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.ai_family = AF_UNSPEC,
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.ai_socktype = SOCK_STREAM,
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.ai_protocol = IPPROTO_TCP,
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};
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error = getaddrinfo(host, port, &hints, &ai);
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if (error) errx(EX_NOHOST, "getaddrinfo: %s", gai_strerror(error));
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int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (sock < 0) err(EX_OSERR, "socket");
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error = connect(sock, ai->ai_addr, ai->ai_addrlen);
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if (error) err(EX_UNAVAILABLE, "connect");
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freeaddrinfo(ai);
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error = tls_connect_socket(client, sock, host);
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if (error) err(EX_PROTOCOL, "tls_connect");
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if (webPass) webirc(webPass);
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clientFmt("NICK %s\r\n", chat.nick);
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clientFmt("USER %s 0 * :%s\r\n", chat.user, chat.nick);
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return sock;
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}
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void clientWrite(const char *ptr, size_t len) {
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while (len) {
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ssize_t ret = tls_write(client, ptr, len);
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if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) continue;
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if (ret < 0) errx(EX_IOERR, "tls_write: %s", tls_error(client));
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ptr += ret;
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len -= ret;
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}
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}
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void clientFmt(const char *format, ...) {
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char *buf;
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va_list ap;
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va_start(ap, format);
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int len = vasprintf(&buf, format, ap);
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va_end(ap);
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if (!buf) err(EX_OSERR, "vasprintf");
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if (chat.verbose) uiFmt("<<< %.*s", len - 2, buf);
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clientWrite(buf, len);
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free(buf);
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}
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void clientRead(void) {
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static char buf[4096];
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static size_t len;
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ssize_t read = tls_read(client, &buf[len], sizeof(buf) - len);
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if (read < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
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if (!read) {
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uiHide();
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exit(EX_OK);
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}
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len += read;
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char *crlf, *line = buf;
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while ((crlf = strnstr(line, "\r\n", &buf[len] - line))) {
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crlf[0] = '\0';
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if (chat.verbose) uiFmt(">>> %s", line);
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handle(line);
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line = &crlf[2];
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}
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len -= line - buf;
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memmove(buf, line, len);
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}
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