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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 <errno.h>
#include <limits.h>
#include <poll.h>
#include <signal.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"
static volatile sig_atomic_t signals[NSIG];
static void signalHandler(int signal) {
signals[signal] = 1;
}
static struct {
struct pollfd *fds;
struct Client **clients;
size_t cap, len;
} event;
static void eventAdd(int fd, struct Client *client) {
if (event.len == event.cap) {
event.cap = (event.cap ? event.cap * 2 : 8);
event.fds = realloc(event.fds, sizeof(*event.fds) * event.cap);
if (!event.fds) err(EX_OSERR, "realloc");
event.clients = realloc(
event.clients, sizeof(*event.clients) * event.cap
);
if (!event.clients) err(EX_OSERR, "realloc");
}
event.fds[event.len] = (struct pollfd) { .fd = fd, .events = POLLIN };
event.clients[event.len] = client;
event.len++;
}
static void eventRemove(size_t i) {
event.len--;
event.fds[i] = event.fds[event.len];
event.clients[i] = event.clients[event.len];
}
static char *sensitive(char *arg) {
char *value = NULL;
if (arg[0] == '@') {
FILE *file = fopen(&arg[1], "r");
if (!file) err(EX_NOINPUT, "%s", &arg[1]);
size_t cap = 0;
ssize_t len = getline(&value, &cap, file);
if (len < 0) err(EX_IOERR, "%s", &arg[1]);
if (len && value[len - 1] == '\n') value[len - 1] = '\0';
fclose(file);
} else {
value = strdup(arg);
if (!value) err(EX_OSERR, "strdup");
}
memset(arg, '\0', strlen(arg));
arg[0] = '*';
return value;
}
int main(int argc, char *argv[]) {
const char *localHost = "localhost";
const char *localPort = "6697";
char certPath[PATH_MAX] = "";
char privPath[PATH_MAX] = "";
bool insecure = false;
const char *host = NULL;
const char *port = "6697";
const char *pass = NULL;
const char *auth = NULL;
const char *nick = NULL;
const char *user = NULL;
const char *real = NULL;
const char *join = NULL;
const char *away = "pounced :3";
int opt;
while (0 < (opt = getopt(argc, argv, "!A:C:H:K:NP:W:a:h:j:n:p:r:u:vw:"))) {
switch (opt) {
break; case '!': insecure = true;
break; case 'A': away = optarg;
break; case 'C': strlcpy(certPath, optarg, sizeof(certPath));
break; case 'H': localHost = optarg;
break; case 'K': strlcpy(privPath, optarg, sizeof(privPath));
break; case 'N': stateJoinNames = true;
break; case 'P': localPort = optarg;
break; case 'W': clientPass = sensitive(optarg);
break; case 'a': auth = sensitive(optarg);
break; case 'h': host = optarg;
break; case 'j': join = optarg;
break; case 'n': nick = optarg;
break; case 'p': port = optarg;
break; case 'r': real = optarg;
break; case 'u': user = optarg;
break; case 'v': verbose = true;
break; case 'w': pass = sensitive(optarg);
break; default: return EX_USAGE;
}
}
if (!certPath[0]) {
snprintf(certPath, sizeof(certPath), DEFAULT_CERT_PATH, localHost);
}
if (!privPath[0]) {
snprintf(privPath, sizeof(privPath), DEFAULT_PRIV_PATH, localHost);
}
if (!host) errx(EX_USAGE, "no host");
if (!nick) {
nick = getenv("USER");
if (!nick) errx(EX_CONFIG, "USER unset");
}
if (!user) user = nick;
if (!real) real = nick;
listenConfig(certPath, privPath);
int bind[8];
size_t binds = listenBind(bind, 8, localHost, localPort);
int server = serverConnect(insecure, host, port);
serverLogin(pass, auth, nick, user, real);
while (!stateReady()) serverRecv();
if (join) serverFormat("JOIN :%s\r\n", join);
for (size_t i = 0; i < binds; ++i) {
int error = listen(bind[i], 1);
if (error) err(EX_IOERR, "listen");
eventAdd(bind[i], NULL);
}
eventAdd(server, NULL);
signal(SIGINT, signalHandler);
signal(SIGTERM, signalHandler);
size_t clients = 0;
for (;;) {
int nfds = poll(event.fds, event.len, -1);
if (nfds < 0 && errno != EINTR) err(EX_IOERR, "poll");
if (signals[SIGINT] || signals[SIGTERM]) break;
if (nfds < 0) continue;
for (size_t i = 0; i < event.len; ++i) {
short revents = event.fds[i].revents;
if (!revents) continue;
if (i < binds) {
int fd;
struct tls *tls = listenAccept(&fd, event.fds[i].fd);
eventAdd(fd, clientAlloc(tls));
// FIXME: This should only be done after a successful client
// registration.
if (!clients++) serverFormat("AWAY\r\n");
continue;
}
if (!event.clients[i]) {
if (revents & POLLIN) {
serverRecv();
} else {
errx(EX_UNAVAILABLE, "server hung up");
}
continue;
}
struct Client *client = event.clients[i];
if (revents & POLLIN) clientRecv(client);
if (revents & POLLOUT) clientConsume(client);
if (clientError(client) || revents & (POLLHUP | POLLERR)) {
clientFree(client);
close(event.fds[i].fd);
eventRemove(i);
if (!--clients) serverFormat("AWAY :%s\r\n", away);
break;
}
}
for (size_t i = binds + 1; i < event.len; ++i) {
assert(event.clients[i]);
if (clientDiff(event.clients[i])) {
event.fds[i].events |= POLLOUT;
} else {
event.fds[i].events &= ~POLLOUT;
}
}
}
serverFormat("QUIT\r\n");
for (size_t i = 0; i < event.len; ++i) {
if (event.clients[i]) {
clientFormat(event.clients[i], "ERROR :Disconnecting\r\n");
clientFree(event.clients[i]);
}
close(event.fds[i].fd);
}
}
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