/*
 * redir.c - Provide a transparent TCP proxy through remote shadowsocks
 *           server
 *
 * Copyright (C) 2013 - 2016, Max Lv <max.c.lv@gmail.com>
 *
 * This file is part of the shadowsocks-libev.
 *
 * shadowsocks-libev is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * shadowsocks-libev 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with shadowsocks-libev; see the file COPYING. If not, see
 * <http://www.gnu.org/licenses/>.
 */

#include <sys/stat.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>
#include <getopt.h>
#include <limits.h>
#include <linux/if.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <udns.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "netutils.h"
#include "utils.h"
#include "common.h"
#include "redir.h"

#ifndef EAGAIN
#define EAGAIN EWOULDBLOCK
#endif

#ifndef EWOULDBLOCK
#define EWOULDBLOCK EAGAIN
#endif

#ifndef BUF_SIZE
#define BUF_SIZE 2048
#endif

#ifndef IP6T_SO_ORIGINAL_DST
#define IP6T_SO_ORIGINAL_DST 80
#endif

static void accept_cb(EV_P_ ev_io *w, int revents);
static void server_recv_cb(EV_P_ ev_io *w, int revents);
static void server_send_cb(EV_P_ ev_io *w, int revents);
static void remote_recv_cb(EV_P_ ev_io *w, int revents);
static void remote_send_cb(EV_P_ ev_io *w, int revents);

static remote_t *new_remote(int fd, int timeout);
static server_t *new_server(int fd, int method);

static void free_remote(remote_t *remote);
static void close_and_free_remote(EV_P_ remote_t *remote);
static void free_server(server_t *server);
static void close_and_free_server(EV_P_ server_t *server);

int verbose = 0;

static int mode = TCP_ONLY;
static int auth = 0;
#ifdef HAVE_SETRLIMIT
static int nofile = 0;
#endif

int getdestaddr(int fd, struct sockaddr_storage *destaddr)
{
    socklen_t socklen = sizeof(*destaddr);
    int error         = 0;

    error = getsockopt(fd, SOL_IPV6, IP6T_SO_ORIGINAL_DST, destaddr, &socklen);
    if (error) { // Didn't find a proper way to detect IP version.
        error = getsockopt(fd, SOL_IP, SO_ORIGINAL_DST, destaddr, &socklen);
        if (error) {
            return -1;
        }
    }
    return 0;
}

int setnonblocking(int fd)
{
    int flags;
    if (-1 == (flags = fcntl(fd, F_GETFL, 0))) {
        flags = 0;
    }
    return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}

int create_and_bind(const char *addr, const char *port)
{
    struct addrinfo hints;
    struct addrinfo *result, *rp;
    int s, listen_sock;

    memset(&hints, 0, sizeof(struct addrinfo));
    hints.ai_family   = AF_UNSPEC;   /* Return IPv4 and IPv6 choices */
    hints.ai_socktype = SOCK_STREAM; /* We want a TCP socket */

    s = getaddrinfo(addr, port, &hints, &result);
    if (s != 0) {
        LOGI("getaddrinfo: %s", gai_strerror(s));
        return -1;
    }

    for (rp = result; rp != NULL; rp = rp->ai_next) {
        listen_sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
        if (listen_sock == -1) {
            continue;
        }

        int opt = 1;
        setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
        setsockopt(listen_sock, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif
        int err = set_reuseport(listen_sock);
        if (err == 0) {
            LOGI("tcp port reuse enabled");
        }

        s = bind(listen_sock, rp->ai_addr, rp->ai_addrlen);
        if (s == 0) {
            /* We managed to bind successfully! */
            break;
        } else {
            ERROR("bind");
        }

        close(listen_sock);
    }

    if (rp == NULL) {
        LOGE("Could not bind");
        return -1;
    }

    freeaddrinfo(result);

    return listen_sock;
}

static void server_recv_cb(EV_P_ ev_io *w, int revents)
{
    server_ctx_t *server_recv_ctx = (server_ctx_t *)w;
    server_t *server              = server_recv_ctx->server;
    remote_t *remote              = server->remote;

    ssize_t r = recv(server->fd, remote->buf->array, BUF_SIZE, 0);

    if (r == 0) {
        // connection closed
        close_and_free_remote(EV_A_ remote);
        close_and_free_server(EV_A_ server);
        return;
    } else if (r < 0) {
        if (errno == EAGAIN || errno == EWOULDBLOCK) {
            // no data
            // continue to wait for recv
            return;
        } else {
            ERROR("server recv");
            close_and_free_remote(EV_A_ remote);
            close_and_free_server(EV_A_ server);
            return;
        }
    }

    if (verbose) {
        uint16_t port = 0;
        char ipstr[INET6_ADDRSTRLEN];
        memset(&ipstr, 0, INET6_ADDRSTRLEN);

        if (AF_INET == server->destaddr.ss_family) {
            struct sockaddr_in *sa = (struct sockaddr_in *)&(server->destaddr);
            dns_ntop(AF_INET, &(sa->sin_addr), ipstr, INET_ADDRSTRLEN);
            port = ntohs(sa->sin_port);
        } else {
            // TODO: The code below need to be test in IPv6 envirment, which I
            //       don't have.
            struct sockaddr_in6 *sa = (struct sockaddr_in6 *)&(server->destaddr);
            dns_ntop(AF_INET6, &(sa->sin6_addr), ipstr, INET6_ADDRSTRLEN);
            port = ntohs(sa->sin6_port);
        }

        LOGI("redir to %s:%d, len=%zd", ipstr, port, r);
    }

    remote->buf->len = r;

    if (auth) {
        ss_gen_hash(remote->buf, &remote->counter, server->e_ctx, BUF_SIZE);
    }

    if (!remote->send_ctx->connected) {
        ev_io_stop(EV_A_ & server_recv_ctx->io);
        ev_io_start(EV_A_ & remote->send_ctx->io);
        return;
    }

    int err = ss_encrypt(remote->buf, server->e_ctx, BUF_SIZE);

    if (err) {
        LOGE("invalid password or cipher");
        close_and_free_remote(EV_A_ remote);
        close_and_free_server(EV_A_ server);
        return;
    }

    int s = send(remote->fd, remote->buf->array, remote->buf->len, 0);

    if (s == -1) {
        if (errno == EAGAIN || errno == EWOULDBLOCK) {
            // no data, wait for send
            remote->buf->idx = 0;
            ev_io_stop(EV_A_ & server_recv_ctx->io);
            ev_io_start(EV_A_ & remote->send_ctx->io);
            return;
        } else {
            ERROR("send");
            close_and_free_remote(EV_A_ remote);
            close_and_free_server(EV_A_ server);
            return;
        }
    } else if (s < remote->buf->len) {
        remote->buf->len -= s;
        remote->buf->idx  = s;
        ev_io_stop(EV_A_ & server_recv_ctx->io);
        ev_io_start(EV_A_ & remote->send_ctx->io);
        return;
    }
}

static void server_send_cb(EV_P_ ev_io *w, int revents)
{
    server_ctx_t *server_send_ctx = (server_ctx_t *)w;
    server_t *server              = server_send_ctx->server;
    remote_t *remote              = server->remote;
    if (server->buf->len == 0) {
        // close and free
        close_and_free_remote(EV_A_ remote);
        close_and_free_server(EV_A_ server);
        return;
    } else {
        // has data to send
        ssize_t s = send(server->fd, server->buf->array + server->buf->idx,
                         server->buf->len, 0);
        if (s < 0) {
            if (errno != EAGAIN && errno != EWOULDBLOCK) {
                ERROR("send");
                close_and_free_remote(EV_A_ remote);
                close_and_free_server(EV_A_ server);
            }
            return;
        } else if (s < server->buf->len) {
            // partly sent, move memory, wait for the next time to send
            server->buf->len -= s;
            server->buf->idx += s;
            return;
        } else {
            // all sent out, wait for reading
            server->buf->len = 0;
            server->buf->idx = 0;
            ev_io_stop(EV_A_ & server_send_ctx->io);
            ev_io_start(EV_A_ & remote->recv_ctx->io);
        }
    }
}

static void remote_timeout_cb(EV_P_ ev_timer *watcher, int revents)
{
    remote_ctx_t *remote_ctx = (remote_ctx_t *)(((void *)watcher)
                                                - sizeof(ev_io));
    remote_t *remote = remote_ctx->remote;
    server_t *server = remote->server;

    ev_timer_stop(EV_A_ watcher);

    close_and_free_remote(EV_A_ remote);
    close_and_free_server(EV_A_ server);
}

static void remote_recv_cb(EV_P_ ev_io *w, int revents)
{
    remote_ctx_t *remote_recv_ctx = (remote_ctx_t *)w;
    remote_t *remote              = remote_recv_ctx->remote;
    server_t *server              = remote->server;

    ssize_t r = recv(remote->fd, server->buf->array, BUF_SIZE, 0);

    if (r == 0) {
        // connection closed
        close_and_free_remote(EV_A_ remote);
        close_and_free_server(EV_A_ server);
        return;
    } else if (r < 0) {
        if (errno == EAGAIN || errno == EWOULDBLOCK) {
            // no data
            // continue to wait for recv
            return;
        } else {
            ERROR("remote recv");
            close_and_free_remote(EV_A_ remote);
            close_and_free_server(EV_A_ server);
            return;
        }
    }

    server->buf->len = r;

    int err = ss_decrypt(server->buf, server->d_ctx, BUF_SIZE);
    if (err) {
        LOGE("invalid password or cipher");
        close_and_free_remote(EV_A_ remote);
        close_and_free_server(EV_A_ server);
        return;
    }
    int s = send(server->fd, server->buf->array, server->buf->len, 0);

    if (s == -1) {
        if (errno == EAGAIN || errno == EWOULDBLOCK) {
            // no data, wait for send
            server->buf->idx = 0;
            ev_io_stop(EV_A_ & remote_recv_ctx->io);
            ev_io_start(EV_A_ & server->send_ctx->io);
            return;
        } else {
            ERROR("send");
            close_and_free_remote(EV_A_ remote);
            close_and_free_server(EV_A_ server);
            return;
        }
    } else if (s < server->buf->len) {
        server->buf->len -= s;
        server->buf->idx  = s;
        ev_io_stop(EV_A_ & remote_recv_ctx->io);
        ev_io_start(EV_A_ & server->send_ctx->io);
        return;
    }
}

static void remote_send_cb(EV_P_ ev_io *w, int revents)
{
    remote_ctx_t *remote_send_ctx = (remote_ctx_t *)w;
    remote_t *remote              = remote_send_ctx->remote;
    server_t *server              = remote->server;

    if (!remote_send_ctx->connected) {
        struct sockaddr_storage addr;
        socklen_t len = sizeof addr;
        int r         = getpeername(remote->fd, (struct sockaddr *)&addr, &len);
        if (r == 0) {
            remote_send_ctx->connected = 1;
            ev_io_stop(EV_A_ & remote_send_ctx->io);
            ev_io_stop(EV_A_ & server->recv_ctx->io);
            ev_timer_stop(EV_A_ & remote_send_ctx->watcher);

            // send destaddr
            buffer_t ss_addr_to_send;
            buffer_t *abuf = &ss_addr_to_send;
            balloc(abuf, BUF_SIZE);

            if (AF_INET6 == server->destaddr.ss_family) { // IPv6
                abuf->array[abuf->len++] = 4;          // Type 4 is IPv6 address

                size_t in6_addr_len = sizeof(struct in6_addr);
                memcpy(abuf->array + abuf->len,
                       &(((struct sockaddr_in6 *)&(server->destaddr))->sin6_addr),
                       in6_addr_len);
                abuf->len += in6_addr_len;
                memcpy(abuf->array + abuf->len,
                       &(((struct sockaddr_in6 *)&(server->destaddr))->sin6_port),
                       2);
            } else {                             // IPv4
                abuf->array[abuf->len++] = 1; // Type 1 is IPv4 address

                size_t in_addr_len = sizeof(struct in_addr);
                memcpy(abuf->array + abuf->len,
                       &((struct sockaddr_in *)&(server->destaddr))->sin_addr, in_addr_len);
                abuf->len += in_addr_len;
                memcpy(abuf->array + abuf->len,
                       &((struct sockaddr_in *)&(server->destaddr))->sin_port, 2);
            }
            abuf->len += 2;

            if (auth) {
                abuf->array[0] |= ONETIMEAUTH_FLAG;
                ss_onetimeauth(abuf, server->e_ctx->evp.iv, BUF_SIZE);
            }

            brealloc(remote->buf, remote->buf->len + abuf->len, BUF_SIZE);
            memmove(remote->buf->array + abuf->len, remote->buf->array, remote->buf->len);
            memcpy(remote->buf->array, abuf->array, abuf->len);
            remote->buf->len += abuf->len;
            bfree(abuf);

            int err = ss_encrypt(remote->buf, server->e_ctx, BUF_SIZE);
            if (err) {
                LOGE("invalid password or cipher");
                close_and_free_remote(EV_A_ remote);
                close_and_free_server(EV_A_ server);
                return;
            }

            ev_io_start(EV_A_ & remote->recv_ctx->io);
        } else {
            ERROR("getpeername");
            // not connected
            close_and_free_remote(EV_A_ remote);
            close_and_free_server(EV_A_ server);
            return;
        }
    }

    if (remote->buf->len == 0) {
        // close and free
        close_and_free_remote(EV_A_ remote);
        close_and_free_server(EV_A_ server);
        return;
    } else {
        // has data to send
        ssize_t s = send(remote->fd, remote->buf->array + remote->buf->idx,
                         remote->buf->len, 0);
        if (s < 0) {
            if (errno != EAGAIN && errno != EWOULDBLOCK) {
                ERROR("send");
                // close and free
                close_and_free_remote(EV_A_ remote);
                close_and_free_server(EV_A_ server);
            }
            return;
        } else if (s < remote->buf->len) {
            // partly sent, move memory, wait for the next time to send
            remote->buf->len -= s;
            remote->buf->idx += s;
            return;
        } else {
            // all sent out, wait for reading
            remote->buf->len = 0;
            remote->buf->idx = 0;
            ev_io_stop(EV_A_ & remote_send_ctx->io);
            ev_io_start(EV_A_ & server->recv_ctx->io);
        }
    }
}

static remote_t *new_remote(int fd, int timeout)
{
    remote_t *remote;
    remote = ss_malloc(sizeof(remote_t));

    memset(remote, 0, sizeof(remote_t));

    remote->recv_ctx            = ss_malloc(sizeof(remote_ctx_t));
    remote->send_ctx            = ss_malloc(sizeof(remote_ctx_t));
    remote->buf                 = ss_malloc(sizeof(buffer_t));
    remote->fd                  = fd;
    remote->recv_ctx->remote    = remote;
    remote->recv_ctx->connected = 0;
    remote->send_ctx->remote    = remote;
    remote->send_ctx->connected = 0;

    ev_io_init(&remote->recv_ctx->io, remote_recv_cb, fd, EV_READ);
    ev_io_init(&remote->send_ctx->io, remote_send_cb, fd, EV_WRITE);
    ev_timer_init(&remote->send_ctx->watcher, remote_timeout_cb,
                  min(MAX_CONNECT_TIMEOUT, timeout), 0);

    balloc(remote->buf, BUF_SIZE);

    return remote;
}

static void free_remote(remote_t *remote)
{
    if (remote != NULL) {
        if (remote->server != NULL) {
            remote->server->remote = NULL;
        }
        if (remote->buf != NULL) {
            bfree(remote->buf);
            ss_free(remote->buf);
        }
        ss_free(remote->recv_ctx);
        ss_free(remote->send_ctx);
        ss_free(remote);
    }
}

static void close_and_free_remote(EV_P_ remote_t *remote)
{
    if (remote != NULL) {
        ev_timer_stop(EV_A_ & remote->send_ctx->watcher);
        ev_io_stop(EV_A_ & remote->send_ctx->io);
        ev_io_stop(EV_A_ & remote->recv_ctx->io);
        close(remote->fd);
        free_remote(remote);
    }
}

static server_t *new_server(int fd, int method)
{
    server_t *server;
    server = ss_malloc(sizeof(server_t));

    server->recv_ctx            = ss_malloc(sizeof(server_ctx_t));
    server->send_ctx            = ss_malloc(sizeof(server_ctx_t));
    server->buf                 = ss_malloc(sizeof(buffer_t));
    server->fd                  = fd;
    server->recv_ctx->server    = server;
    server->recv_ctx->connected = 0;
    server->send_ctx->server    = server;
    server->send_ctx->connected = 0;

    if (method) {
        server->e_ctx = ss_malloc(sizeof(enc_ctx_t));
        server->d_ctx = ss_malloc(sizeof(enc_ctx_t));
        enc_ctx_init(method, server->e_ctx, 1);
        enc_ctx_init(method, server->d_ctx, 0);
    } else {
        server->e_ctx = NULL;
        server->d_ctx = NULL;
    }

    ev_io_init(&server->recv_ctx->io, server_recv_cb, fd, EV_READ);
    ev_io_init(&server->send_ctx->io, server_send_cb, fd, EV_WRITE);

    balloc(server->buf, BUF_SIZE);

    return server;
}

static void free_server(server_t *server)
{
    if (server != NULL) {
        if (server->remote != NULL) {
            server->remote->server = NULL;
        }
        if (server->e_ctx != NULL) {
            cipher_context_release(&server->e_ctx->evp);
            ss_free(server->e_ctx);
        }
        if (server->d_ctx != NULL) {
            cipher_context_release(&server->d_ctx->evp);
            ss_free(server->d_ctx);
        }
        if (server->buf != NULL) {
            bfree(server->buf);
            ss_free(server->buf);
        }
        ss_free(server->recv_ctx);
        ss_free(server->send_ctx);
        ss_free(server);
    }
}

static void close_and_free_server(EV_P_ server_t *server)
{
    if (server != NULL) {
        ev_io_stop(EV_A_ & server->send_ctx->io);
        ev_io_stop(EV_A_ & server->recv_ctx->io);
        close(server->fd);
        free_server(server);
    }
}

static void accept_cb(EV_P_ ev_io *w, int revents)
{
    listen_ctx_t *listener = (listen_ctx_t *)w;
    struct sockaddr_storage destaddr;
    int err;

    int serverfd = accept(listener->fd, NULL, NULL);
    if (serverfd == -1) {
        ERROR("accept");
        return;
    }

    err = getdestaddr(serverfd, &destaddr);
    if (err) {
        ERROR("getdestaddr");
        return;
    }

    setnonblocking(serverfd);
    int opt = 1;
    setsockopt(serverfd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
    setsockopt(serverfd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif

    int index                    = rand() % listener->remote_num;
    struct sockaddr *remote_addr = listener->remote_addr[index];

    int remotefd = socket(remote_addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
    if (remotefd < 0) {
        ERROR("socket");
        return;
    }

    setsockopt(remotefd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt));
#ifdef SO_NOSIGPIPE
    setsockopt(remotefd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt));
#endif

    // Enable TCP keepalive feature
    int keepAlive    = 1;
    int keepIdle     = 40;
    int keepInterval = 20;
    int keepCount    = 5;
    setsockopt(remotefd, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepAlive, sizeof(keepAlive));
    setsockopt(remotefd, SOL_TCP, TCP_KEEPIDLE, (void *)&keepIdle, sizeof(keepIdle));
    setsockopt(remotefd, SOL_TCP, TCP_KEEPINTVL, (void *)&keepInterval, sizeof(keepInterval));
    setsockopt(remotefd, SOL_TCP, TCP_KEEPCNT, (void *)&keepCount, sizeof(keepCount));

    // Setup
    setnonblocking(remotefd);

    server_t *server = new_server(serverfd, listener->method);
    remote_t *remote = new_remote(remotefd, listener->timeout);
    server->remote   = remote;
    remote->server   = server;
    server->destaddr = destaddr;

    int r = connect(remotefd, remote_addr, get_sockaddr_len(remote_addr));

    if (r < 0 && errno != CONNECT_IN_PROGRESS) {
        ERROR("connect");
        close_and_free_remote(EV_A_ remote);
        close_and_free_server(EV_A_ server);
        return;
    }

    if (r == 0) {
        if (verbose) LOGI("connected immediately");
        remote_send_cb(EV_A_ & remote->send_ctx->io, 0);
    } else {
        // listen to remote connected event
        ev_io_start(EV_A_ & remote->send_ctx->io);
        ev_timer_start(EV_A_ & remote->send_ctx->watcher);
    }

    ev_io_start(EV_A_ & server->recv_ctx->io);
}

int main(int argc, char **argv)
{
    int i, c;
    int pid_flags    = 0;
    char *user       = NULL;
    char *local_port = NULL;
    char *local_addr = NULL;
    char *password   = NULL;
    char *timeout    = NULL;
    char *method     = NULL;
    char *pid_path   = NULL;
    char *conf_path  = NULL;

    int remote_num = 0;
    ss_addr_t remote_addr[MAX_REMOTE_NUM];
    char *remote_port = NULL;

    int option_index                    = 0;
    static struct option long_options[] = {
        { "help", no_argument, 0, 0 },
        {      0,           0, 0, 0 }
    };

    opterr = 0;

    while ((c = getopt_long(argc, argv, "f:s:p:l:k:t:m:c:b:a:n:huUvA",
                            long_options, &option_index)) != -1) {
        switch (c) {
        case 0:
            if (option_index == 0) {
                usage();
                exit(EXIT_SUCCESS);
            }
            break;
        case 's':
            if (remote_num < MAX_REMOTE_NUM) {
                remote_addr[remote_num].host   = optarg;
                remote_addr[remote_num++].port = NULL;
            }
            break;
        case 'p':
            remote_port = optarg;
            break;
        case 'l':
            local_port = optarg;
            break;
        case 'k':
            password = optarg;
            break;
        case 'f':
            pid_flags = 1;
            pid_path  = optarg;
            break;
        case 't':
            timeout = optarg;
            break;
        case 'm':
            method = optarg;
            break;
        case 'c':
            conf_path = optarg;
            break;
        case 'b':
            local_addr = optarg;
            break;
        case 'a':
            user = optarg;
            break;
#ifdef HAVE_SETRLIMIT
        case 'n':
            nofile = atoi(optarg);
            break;
#endif
        case 'u':
            mode = TCP_AND_UDP;
            break;
        case 'U':
            mode = UDP_ONLY;
            break;
        case 'v':
            verbose = 1;
            break;
        case 'h':
            usage();
            exit(EXIT_SUCCESS);
        case 'A':
            auth = 1;
            break;
        case '?':
            // The option character is not recognized.
            opterr = 1;
            break;
        }
    }

    if (opterr) {
        usage();
        exit(EXIT_FAILURE);
    }

    if (argc == 1) {
        if (conf_path == NULL) {
            conf_path = DEFAULT_CONF_PATH;
        }
    }

    if (conf_path != NULL) {
        jconf_t *conf = read_jconf(conf_path);
        if (remote_num == 0) {
            remote_num = conf->remote_num;
            for (i = 0; i < remote_num; i++)
                remote_addr[i] = conf->remote_addr[i];
        }
        if (remote_port == NULL) {
            remote_port = conf->remote_port;
        }
        if (local_addr == NULL) {
            local_addr = conf->local_addr;
        }
        if (local_port == NULL) {
            local_port = conf->local_port;
        }
        if (password == NULL) {
            password = conf->password;
        }
        if (method == NULL) {
            method = conf->method;
        }
        if (timeout == NULL) {
            timeout = conf->timeout;
        }
        if (auth == 0) {
            auth = conf->auth;
        }
#ifdef HAVE_SETRLIMIT
        if (nofile == 0) {
            nofile = conf->nofile;
        }
        /*
         * no need to check the return value here since we will show
         * the user an error message if setrlimit(2) fails
         */
        if (nofile > 1024) {
            if (verbose) {
                LOGI("setting NOFILE to %d", nofile);
            }
            set_nofile(nofile);
        }
#endif
    }

    if (remote_num == 0 || remote_port == NULL ||
        local_port == NULL || password == NULL) {
        usage();
        exit(EXIT_FAILURE);
    }

    if (timeout == NULL) {
        timeout = "60";
    }

    if (local_addr == NULL) {
        local_addr = "127.0.0.1";
    }

    if (pid_flags) {
        USE_SYSLOG(argv[0]);
        daemonize(pid_path);
    }

    if (auth) {
        LOGI("onetime authentication enabled");
    }

    // ignore SIGPIPE
    signal(SIGPIPE, SIG_IGN);
    signal(SIGABRT, SIG_IGN);

    // Setup keys
    LOGI("initializing ciphers... %s", method);
    int m = enc_init(password, method);

    // Setup proxy context
    listen_ctx_t listen_ctx;
    listen_ctx.remote_num  = remote_num;
    listen_ctx.remote_addr = ss_malloc(sizeof(struct sockaddr *) * remote_num);
    for (int i = 0; i < remote_num; i++) {
        char *host = remote_addr[i].host;
        char *port = remote_addr[i].port == NULL ? remote_port :
                     remote_addr[i].port;
        struct sockaddr_storage *storage = ss_malloc(sizeof(struct sockaddr_storage));
        memset(storage, 0, sizeof(struct sockaddr_storage));
        if (get_sockaddr(host, port, storage, 1) == -1) {
            FATAL("failed to resolve the provided hostname");
        }
        listen_ctx.remote_addr[i] = (struct sockaddr *)storage;
    }
    listen_ctx.timeout = atoi(timeout);
    listen_ctx.method  = m;

    struct ev_loop *loop = EV_DEFAULT;

    if (mode != UDP_ONLY) {
        // Setup socket
        int listenfd;
        listenfd = create_and_bind(local_addr, local_port);
        if (listenfd < 0) {
            FATAL("bind() error");
        }
        if (listen(listenfd, SOMAXCONN) == -1) {
            FATAL("listen() error");
        }
        setnonblocking(listenfd);

        listen_ctx.fd = listenfd;

        ev_io_init(&listen_ctx.io, accept_cb, listenfd, EV_READ);
        ev_io_start(loop, &listen_ctx.io);
    }

    // Setup UDP
    if (mode != TCP_ONLY) {
        LOGI("UDP relay enabled");
        init_udprelay(local_addr, local_port, listen_ctx.remote_addr[0],
                      get_sockaddr_len(listen_ctx.remote_addr[0]), m, auth, listen_ctx.timeout, NULL);
    }

    if (mode == UDP_ONLY) {
        LOGI("TCP relay disabled");
    }

    LOGI("listening at %s:%s", local_addr, local_port);

    // setuid
    if (user != NULL) {
        run_as(user);
    }

    ev_run(loop, 0);

    return 0;
}