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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 <assert.h>
#include <err.h>
#include <netdb.h>
#include <netinet/in.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 "bounce.h"
typedef unsigned char byte;
static struct tls *client;
int serverConnect(const char *host, const char *port) {
int error;
struct tls_config *config = tls_config_new();
error = tls_config_set_ciphers(config, "compat");
if (error) errx(EX_SOFTWARE, "tls_config");
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, "%s:%s: %s", host, port, 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, "%s:%s", host, port);
freeaddrinfo(head);
int yes = 1;
error = setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, &yes, sizeof(yes));
if (error) err(EX_OSERR, "setsockopt");
error = tls_connect_socket(client, sock, host);
if (error) errx(EX_PROTOCOL, "tls_connect: %s", tls_error(client));
return sock;
}
void serverSend(const char *ptr, size_t len) {
if (verbose) fprintf(stderr, "\x1B[31m%.*s\x1B[m", (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;
}
}
void serverFormat(const char *format, ...) {
char buf[513];
va_list ap;
va_start(ap, format);
int len = vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
assert(len > 0 && (size_t)len < sizeof(buf));
serverSend(buf, len);
}
static const char Base64[64] = {
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
};
static char *base64(const byte *src, size_t len) {
char *dst = malloc(1 + (len + 2) / 3 * 4);
if (!dst) err(EX_OSERR, "malloc");
size_t i = 0;
while (len > 2) {
dst[i++] = Base64[0x3F & (src[0] >> 2)];
dst[i++] = Base64[0x3F & (src[0] << 4 | src[1] >> 4)];
dst[i++] = Base64[0x3F & (src[1] << 2 | src[2] >> 6)];
dst[i++] = Base64[0x3F & src[2]];
src += 3;
len -= 3;
}
if (len) {
dst[i++] = Base64[0x3F & (src[0] >> 2)];
if (len > 1) {
dst[i++] = Base64[0x3F & (src[0] << 4 | src[1] >> 4)];
dst[i++] = Base64[0x3F & (src[1] << 2)];
} else {
dst[i++] = Base64[0x3F & (src[0] << 4)];
dst[i++] = '=';
}
dst[i++] = '=';
}
dst[i] = '\0';
return dst;
}
static char *authBase64;
void serverLogin(
const char *pass, const char *auth,
const char *nick, const char *user, const char *real
) {
if (pass) serverFormat("PASS :%s\r\n", pass);
if (auth) {
byte plain[1 + strlen(auth)];
plain[0] = 0;
for (size_t i = 0; auth[i]; ++i) {
plain[1 + i] = (auth[i] == ':' ? 0 : auth[i]);
}
authBase64 = base64(plain, sizeof(plain));
serverFormat("CAP REQ :sasl\r\n");
}
serverFormat("NICK %s\r\nUSER %s 0 * :%s\r\n", nick, user, real);
}
void serverAuth(void) {
assert(authBase64);
serverFormat(
"AUTHENTICATE PLAIN\r\nAUTHENTICATE %s\r\nCAP END\r\n", authBase64
);
free(authBase64);
authBase64 = NULL;
}
void serverRecv(void) {
static char buf[4096];
static size_t len;
ssize_t read = tls_read(client, &buf[len], sizeof(buf) - len);
if (read == TLS_WANT_POLLIN || read == TLS_WANT_POLLOUT) return;
if (read < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
if (!read) errx(EX_DATAERR, "tls_read: eof");
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) fprintf(stderr, "\x1B[32m%s\x1B[m\n", line);
if (!strncmp(line, "PING ", 5)) {
line[1] = 'O';
serverFormat("%s\r\n", line);
} else {
if (stateReady()) ringWrite(line);
stateParse(line);
}
line = crlf + 2;
}
len -= line - buf;
memmove(buf, line, len);
}
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