2013-10-15 01:41:47 +02:00
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 David Strauss
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <arpa/inet.h>
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#include <errno.h>
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#include <getopt.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 <netdb.h>
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#include <sys/fcntl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "log.h"
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#include "sd-daemon.h"
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#include "sd-event.h"
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#include "socket-util.h"
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#include "util.h"
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2013-10-16 02:29:51 +02:00
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#define BUFFER_SIZE 16384
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2013-10-15 01:41:47 +02:00
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#define _cleanup_freeaddrinfo_ _cleanup_(freeaddrinfop)
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unsigned int total_clients = 0;
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DEFINE_TRIVIAL_CLEANUP_FUNC(struct addrinfo *, freeaddrinfo);
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struct proxy {
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int listen_fd;
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bool ignore_env;
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bool remote_is_inet;
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const char *remote_host;
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const char *remote_service;
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};
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struct connection {
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int fd;
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2013-10-16 03:55:25 +02:00
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uint32_t events;
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sd_event_source *w;
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2013-10-15 01:41:47 +02:00
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struct connection *c_destination;
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size_t buffer_filled_len;
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size_t buffer_sent_len;
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char buffer[BUFFER_SIZE];
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};
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static void free_connection(struct connection *c) {
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log_debug("Freeing fd=%d (conn %p).", c->fd, c);
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2013-10-16 03:55:25 +02:00
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sd_event_source_unref(c->w);
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2013-10-15 01:41:47 +02:00
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close(c->fd);
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free(c);
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}
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2013-10-16 03:55:25 +02:00
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static int add_event_to_connection(struct connection *c, uint32_t events) {
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int r;
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log_debug("Have revents=%d. Adding revents=%d.", c->events, events);
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c->events |= events;
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r = sd_event_source_set_io_events(c->w, c->events);
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if (r < 0) {
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log_error("Error %d setting revents: %s", r, strerror(-r));
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return r;
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}
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r = sd_event_source_set_enabled(c->w, SD_EVENT_ON);
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if (r < 0) {
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log_error("Error %d enabling source: %s", r, strerror(-r));
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return r;
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}
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return 0;
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}
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static int remove_event_from_connection(struct connection *c, uint32_t events) {
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int r;
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log_debug("Have revents=%d. Removing revents=%d.", c->events, events);
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c->events &= ~events;
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r = sd_event_source_set_io_events(c->w, c->events);
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if (r < 0) {
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log_error("Error %d setting revents: %s", r, strerror(-r));
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return r;
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}
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if (c->events == 0) {
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r = sd_event_source_set_enabled(c->w, SD_EVENT_OFF);
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if (r < 0) {
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log_error("Error %d disabling source: %s", r, strerror(-r));
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return r;
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}
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}
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return 0;
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}
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2013-10-15 01:41:47 +02:00
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static int send_buffer(struct connection *sender) {
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struct connection *receiver = sender->c_destination;
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ssize_t len;
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int r = 0;
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/* We cannot assume that even a partial send() indicates that
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* the next send() will block. Loop until it does. */
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while (sender->buffer_filled_len > sender->buffer_sent_len) {
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len = send(receiver->fd, sender->buffer + sender->buffer_sent_len, sender->buffer_filled_len - sender->buffer_sent_len, 0);
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log_debug("send(%d, ...)=%ld", receiver->fd, len);
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if (len < 0) {
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if (errno != EWOULDBLOCK && errno != EAGAIN) {
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log_error("Error %d in send to fd=%d: %m", errno, receiver->fd);
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return -errno;
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}
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else {
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/* send() is in a blocking state. */
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break;
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}
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}
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/* len < 0 can't occur here. len == 0 is possible but
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* undefined behavior for nonblocking send(). */
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assert(len > 0);
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sender->buffer_sent_len += len;
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}
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log_debug("send(%d, ...) completed with %lu bytes still buffered.", receiver->fd, sender->buffer_filled_len - sender->buffer_sent_len);
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/* Detect a would-block state or partial send. */
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if (sender->buffer_filled_len > sender->buffer_sent_len) {
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/* If the buffer is full, disable events coming for recv. */
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if (sender->buffer_filled_len == BUFFER_SIZE) {
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2013-10-16 03:55:25 +02:00
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r = remove_event_from_connection(sender, EPOLLIN);
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2013-10-15 01:41:47 +02:00
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if (r < 0) {
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2013-10-16 03:55:25 +02:00
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log_error("Error %d disabling EPOLLIN for fd=%d: %s", r, sender->fd, strerror(-r));
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2013-10-15 01:41:47 +02:00
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return r;
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}
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}
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/* Watch for when the recipient can be sent data again. */
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2013-10-16 03:55:25 +02:00
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r = add_event_to_connection(receiver, EPOLLOUT);
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2013-10-15 01:41:47 +02:00
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if (r < 0) {
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2013-10-16 03:55:25 +02:00
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log_error("Error %d enabling EPOLLOUT for fd=%d: %s", r, receiver->fd, strerror(-r));
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2013-10-15 01:41:47 +02:00
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return r;
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}
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log_debug("Done with recv for fd=%d. Waiting on send for fd=%d.", sender->fd, receiver->fd);
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return r;
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}
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/* If we sent everything without blocking, the buffer is now empty. */
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sender->buffer_filled_len = 0;
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sender->buffer_sent_len = 0;
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2013-10-16 03:55:25 +02:00
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/* Enable the sender's receive watcher, in case the buffer was
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* full and we disabled it. */
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r = add_event_to_connection(sender, EPOLLIN);
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2013-10-15 01:41:47 +02:00
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if (r < 0) {
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2013-10-16 03:55:25 +02:00
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log_error("Error %d enabling EPOLLIN for fd=%d: %s", r, sender->fd, strerror(-r));
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2013-10-15 01:41:47 +02:00
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return r;
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}
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2013-10-16 03:55:25 +02:00
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/* Disable the other side's send watcher, as we have no data to send now. */
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r = remove_event_from_connection(receiver, EPOLLOUT);
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2013-10-15 01:41:47 +02:00
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if (r < 0) {
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2013-10-16 03:55:25 +02:00
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log_error("Error %d disabling EPOLLOUT for fd=%d: %s", r, receiver->fd, strerror(-r));
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2013-10-15 01:41:47 +02:00
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return r;
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}
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return 0;
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}
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static int transfer_data_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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struct connection *c = (struct connection *) userdata;
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int r = 0;
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ssize_t len;
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assert(revents & (EPOLLIN | EPOLLOUT));
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assert(fd == c->fd);
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2013-10-16 03:55:25 +02:00
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assert(s == c->w);
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2013-10-15 01:41:47 +02:00
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log_debug("Got event revents=%d from fd=%d (conn %p).", revents, fd, c);
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if (revents & EPOLLIN) {
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log_debug("About to recv up to %lu bytes from fd=%d (%lu/BUFFER_SIZE).", BUFFER_SIZE - c->buffer_filled_len, fd, c->buffer_filled_len);
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/* Receive until the buffer's full, there's no more data,
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* or the client/server disconnects. */
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while (c->buffer_filled_len < BUFFER_SIZE) {
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len = recv(fd, c->buffer + c->buffer_filled_len, BUFFER_SIZE - c->buffer_filled_len, 0);
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log_debug("recv(%d, ...)=%ld", fd, len);
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if (len < 0) {
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if (errno != EWOULDBLOCK && errno != EAGAIN) {
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log_error("Error %d in recv from fd=%d: %m", errno, fd);
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return -errno;
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}
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else {
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/* recv() is in a blocking state. */
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break;
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}
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}
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else if (len == 0) {
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log_debug("Clean disconnection from fd=%d", fd);
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total_clients--;
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free_connection(c->c_destination);
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free_connection(c);
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return 0;
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}
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assert(len > 0);
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log_debug("Recording that the buffer got %ld more bytes full.", len);
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c->buffer_filled_len += len;
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log_debug("Buffer now has %ld bytes full.", c->buffer_filled_len);
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}
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/* Try sending the data immediately. */
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return send_buffer(c);
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}
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else {
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return send_buffer(c->c_destination);
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}
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return r;
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}
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/* Once sending to the server is unblocked, set up the real watchers. */
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static int connected_to_server_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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struct sd_event *e = NULL;
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struct connection *c_server_to_client = (struct connection *) userdata;
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struct connection *c_client_to_server = c_server_to_client->c_destination;
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int r;
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assert(revents & EPOLLOUT);
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e = sd_event_get(s);
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/* Cancel the initial write watcher for the server. */
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sd_event_source_unref(s);
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log_debug("Connected to server. Initializing watchers for receiving data.");
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/* A recv watcher for the server. */
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2013-10-16 03:55:25 +02:00
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r = sd_event_add_io(e, c_server_to_client->fd, EPOLLIN, transfer_data_cb, c_server_to_client, &c_server_to_client->w);
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2013-10-15 01:41:47 +02:00
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if (r < 0) {
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log_error("Error %d creating recv watcher for fd=%d: %s", r, c_server_to_client->fd, strerror(-r));
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goto fail;
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}
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2013-10-16 03:55:25 +02:00
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c_server_to_client->events = EPOLLIN;
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2013-10-15 01:41:47 +02:00
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/* A recv watcher for the client. */
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2013-10-16 03:55:25 +02:00
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r = sd_event_add_io(e, c_client_to_server->fd, EPOLLIN, transfer_data_cb, c_client_to_server, &c_client_to_server->w);
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2013-10-15 01:41:47 +02:00
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if (r < 0) {
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log_error("Error %d creating recv watcher for fd=%d: %s", r, c_client_to_server->fd, strerror(-r));
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goto fail;
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}
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2013-10-16 03:55:25 +02:00
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c_client_to_server->events = EPOLLIN;
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2013-10-15 01:41:47 +02:00
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goto finish;
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fail:
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free_connection(c_client_to_server);
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free_connection(c_server_to_client);
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finish:
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return r;
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}
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static int get_server_connection_fd(const struct proxy *proxy) {
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int server_fd;
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int r = -EBADF;
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int len;
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if (proxy->remote_is_inet) {
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int s;
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_cleanup_freeaddrinfo_ struct addrinfo *result = NULL;
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struct addrinfo hints = {.ai_family = AF_UNSPEC,
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.ai_socktype = SOCK_STREAM,
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.ai_flags = AI_PASSIVE};
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log_debug("Looking up address info for %s:%s", proxy->remote_host, proxy->remote_service);
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s = getaddrinfo(proxy->remote_host, proxy->remote_service, &hints, &result);
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if (s != 0) {
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log_error("getaddrinfo error (%d): %s", s, gai_strerror(s));
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return r;
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}
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if (result == NULL) {
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log_error("getaddrinfo: no result");
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return r;
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}
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/* @TODO: Try connecting to all results instead of just the first. */
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server_fd = socket(result->ai_family, result->ai_socktype | SOCK_NONBLOCK, result->ai_protocol);
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if (server_fd < 0) {
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log_error("Error %d creating socket: %m", errno);
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return r;
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}
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r = connect(server_fd, result->ai_addr, result->ai_addrlen);
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/* Ignore EINPROGRESS errors because they're expected for a nonblocking socket. */
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if (r < 0 && errno != EINPROGRESS) {
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log_error("Error %d while connecting to socket %s:%s: %m", errno, proxy->remote_host, proxy->remote_service);
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return r;
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}
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}
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else {
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struct sockaddr_un remote;
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server_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0);
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if (server_fd < 0) {
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log_error("Error %d creating socket: %m", errno);
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return -EBADFD;
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}
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remote.sun_family = AF_UNIX;
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strncpy(remote.sun_path, proxy->remote_host, sizeof(remote.sun_path));
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len = strlen(remote.sun_path) + sizeof(remote.sun_family);
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r = connect(server_fd, (struct sockaddr *) &remote, len);
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if (r < 0 && errno != EINPROGRESS) {
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|
|
log_error("Error %d while connecting to Unix domain socket %s: %m", errno, proxy->remote_host);
|
|
|
|
return -EBADFD;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
log_debug("Server connection is fd=%d", server_fd);
|
|
|
|
return server_fd;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int accept_cb(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
|
|
struct proxy *proxy = (struct proxy *) userdata;
|
|
|
|
struct connection *c_server_to_client;
|
|
|
|
struct connection *c_client_to_server;
|
|
|
|
int r = 0;
|
|
|
|
union sockaddr_union sa;
|
|
|
|
socklen_t salen = sizeof(sa);
|
|
|
|
|
|
|
|
assert(revents & EPOLLIN);
|
|
|
|
|
|
|
|
c_server_to_client = malloc0(sizeof(struct connection));
|
|
|
|
if (c_server_to_client == NULL) {
|
|
|
|
log_oom();
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
c_client_to_server = malloc0(sizeof(struct connection));
|
|
|
|
if (c_client_to_server == NULL) {
|
|
|
|
log_oom();
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
c_server_to_client->fd = get_server_connection_fd(proxy);
|
|
|
|
if (c_server_to_client->fd < 0) {
|
|
|
|
log_error("Error initiating server connection.");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
c_client_to_server->fd = accept(fd, (struct sockaddr *) &sa, &salen);
|
|
|
|
if (c_client_to_server->fd < 0) {
|
|
|
|
log_error("Error accepting client connection.");
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Unlike on BSD, client sockets do not inherit nonblocking status
|
|
|
|
* from the listening socket. */
|
|
|
|
r = fd_nonblock(c_client_to_server->fd, true);
|
|
|
|
if (r < 0) {
|
|
|
|
log_error("Error %d marking client connection as nonblocking: %s", r, strerror(-r));
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sa.sa.sa_family == AF_INET || sa.sa.sa_family == AF_INET6) {
|
|
|
|
char sa_str[INET6_ADDRSTRLEN];
|
|
|
|
const char *success;
|
|
|
|
|
|
|
|
success = inet_ntop(sa.sa.sa_family, &sa.in6.sin6_addr, sa_str, INET6_ADDRSTRLEN);
|
|
|
|
if (success == NULL)
|
|
|
|
log_warning("Error %d calling inet_ntop: %m", errno);
|
|
|
|
else
|
|
|
|
log_debug("Accepted client connection from %s as fd=%d", sa_str, c_client_to_server->fd);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
log_debug("Accepted client connection (non-IP) as fd=%d", c_client_to_server->fd);
|
|
|
|
}
|
|
|
|
|
|
|
|
total_clients++;
|
|
|
|
log_debug("Client fd=%d (conn %p) successfully connected. Total clients: %u", c_client_to_server->fd, c_client_to_server, total_clients);
|
|
|
|
log_debug("Server fd=%d (conn %p) successfully initialized.", c_server_to_client->fd, c_server_to_client);
|
|
|
|
|
|
|
|
/* Initialize watcher for send to server; this shows connectivity. */
|
2013-10-16 03:55:25 +02:00
|
|
|
r = sd_event_add_io(sd_event_get(s), c_server_to_client->fd, EPOLLOUT, connected_to_server_cb, c_server_to_client, &c_server_to_client->w);
|
2013-10-15 01:41:47 +02:00
|
|
|
if (r < 0) {
|
|
|
|
log_error("Error %d creating connectivity watcher for fd=%d: %s", r, c_server_to_client->fd, strerror(-r));
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Allow lookups of the opposite connection. */
|
|
|
|
c_server_to_client->c_destination = c_client_to_server;
|
|
|
|
c_client_to_server->c_destination = c_server_to_client;
|
|
|
|
|
|
|
|
goto finish;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
log_warning("Accepting a client connection or connecting to the server failed.");
|
|
|
|
free_connection(c_client_to_server);
|
|
|
|
free_connection(c_server_to_client);
|
|
|
|
|
|
|
|
finish:
|
|
|
|
/* Preserve the main loop even if a single proxy setup fails. */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int run_main_loop(struct proxy *proxy) {
|
|
|
|
int r = EXIT_SUCCESS;
|
|
|
|
struct sd_event *e = NULL;
|
|
|
|
sd_event_source *w_accept = NULL;
|
|
|
|
|
|
|
|
r = sd_event_new(&e);
|
|
|
|
if (r < 0)
|
|
|
|
goto finish;
|
|
|
|
|
|
|
|
r = fd_nonblock(proxy->listen_fd, true);
|
|
|
|
if (r < 0)
|
|
|
|
goto finish;
|
|
|
|
|
|
|
|
log_debug("Initializing main listener fd=%d", proxy->listen_fd);
|
|
|
|
|
|
|
|
sd_event_add_io(e, proxy->listen_fd, EPOLLIN, accept_cb, proxy, &w_accept);
|
|
|
|
|
|
|
|
log_debug("Initialized main listener. Entering loop.");
|
|
|
|
|
|
|
|
sd_event_loop(e);
|
|
|
|
|
|
|
|
finish:
|
|
|
|
sd_event_source_unref(w_accept);
|
|
|
|
sd_event_unref(e);
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int help(void) {
|
|
|
|
|
|
|
|
printf("%s hostname-or-ip port-or-service\n"
|
|
|
|
"%s unix-domain-socket-path\n\n"
|
|
|
|
"Inherit a socket. Bidirectionally proxy.\n\n"
|
|
|
|
" -h --help Show this help\n"
|
|
|
|
" --version Print version and exit\n"
|
|
|
|
" --ignore-env Ignore expected systemd environment\n",
|
|
|
|
program_invocation_short_name,
|
|
|
|
program_invocation_short_name);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void version(void) {
|
2013-10-16 02:00:18 +02:00
|
|
|
puts(PACKAGE_STRING " saproxy");
|
2013-10-15 01:41:47 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int parse_argv(int argc, char *argv[], struct proxy *p) {
|
|
|
|
|
|
|
|
enum {
|
|
|
|
ARG_VERSION = 0x100,
|
|
|
|
ARG_IGNORE_ENV
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct option options[] = {
|
|
|
|
{ "help", no_argument, NULL, 'h' },
|
|
|
|
{ "version", no_argument, NULL, ARG_VERSION },
|
|
|
|
{ "ignore-env", no_argument, NULL, ARG_IGNORE_ENV},
|
|
|
|
{ NULL, 0, NULL, 0 }
|
|
|
|
};
|
|
|
|
|
|
|
|
int c;
|
|
|
|
|
|
|
|
assert(argc >= 0);
|
|
|
|
assert(argv);
|
|
|
|
|
|
|
|
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
|
|
|
|
|
|
|
|
switch (c) {
|
|
|
|
|
|
|
|
case 'h':
|
|
|
|
help();
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
case '?':
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
case ARG_VERSION:
|
|
|
|
version();
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
case ARG_IGNORE_ENV:
|
|
|
|
p->ignore_env = true;
|
|
|
|
continue;
|
|
|
|
|
|
|
|
default:
|
|
|
|
log_error("Unknown option code %c", c);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (optind + 1 != argc && optind + 2 != argc) {
|
|
|
|
log_error("Incorrect number of positional arguments.");
|
|
|
|
help();
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
p->remote_host = argv[optind];
|
|
|
|
assert(p->remote_host);
|
|
|
|
|
|
|
|
p->remote_is_inet = p->remote_host[0] != '/';
|
|
|
|
|
|
|
|
if (optind == argc - 2) {
|
|
|
|
if (!p->remote_is_inet) {
|
|
|
|
log_error("A port or service is not allowed for Unix socket destinations.");
|
|
|
|
help();
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
p->remote_service = argv[optind + 1];
|
|
|
|
assert(p->remote_service);
|
|
|
|
} else if (p->remote_is_inet) {
|
|
|
|
log_error("A port or service is required for IP destinations.");
|
|
|
|
help();
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
int main(int argc, char *argv[]) {
|
|
|
|
struct proxy p = {};
|
|
|
|
int r;
|
|
|
|
|
|
|
|
log_parse_environment();
|
|
|
|
log_open();
|
|
|
|
|
|
|
|
r = parse_argv(argc, argv, &p);
|
|
|
|
if (r <= 0)
|
|
|
|
goto finish;
|
|
|
|
|
|
|
|
p.listen_fd = SD_LISTEN_FDS_START;
|
|
|
|
|
|
|
|
if (!p.ignore_env) {
|
|
|
|
int n;
|
|
|
|
n = sd_listen_fds(1);
|
|
|
|
if (n == 0) {
|
|
|
|
log_error("Found zero inheritable sockets. Are you sure this is running as a socket-activated service?");
|
|
|
|
r = EXIT_FAILURE;
|
|
|
|
goto finish;
|
|
|
|
} else if (n < 0) {
|
|
|
|
log_error("Error %d while finding inheritable sockets: %s", n, strerror(-n));
|
|
|
|
r = EXIT_FAILURE;
|
|
|
|
goto finish;
|
|
|
|
} else if (n > 1) {
|
|
|
|
log_error("Can't listen on more than one socket.");
|
|
|
|
r = EXIT_FAILURE;
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* @TODO: Check if this proxy can work with datagram sockets. */
|
|
|
|
r = sd_is_socket(p.listen_fd, 0, SOCK_STREAM, 1);
|
|
|
|
if (r < 0) {
|
|
|
|
log_error("Error %d while checking inherited socket: %s", r, strerror(-r));
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
|
2013-10-16 02:00:18 +02:00
|
|
|
log_info("Starting the socket activation proxy with listener fd=%d.", p.listen_fd);
|
2013-10-15 01:41:47 +02:00
|
|
|
|
|
|
|
r = run_main_loop(&p);
|
|
|
|
if (r < 0) {
|
|
|
|
log_error("Error %d from main loop.", r);
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
|
|
|
|
finish:
|
|
|
|
log_close();
|
|
|
|
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
|
|
}
|