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spdylay/examples/shrpx.cc
Tatsuhiro Tsujikawa e5249538a6 Added --add-x-forwarded-for option. 
This option append X-Forwarded-For header field to the downstream
request.
2012-07-12 23:39:11 +09:00

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/*
* Spdylay - SPDY Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "shrpx.h"
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <getopt.h>
#include <limits>
#include <cstdlib>
#include <iostream>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <event2/listener.h>
#include <spdylay/spdylay.h>
#include "shrpx_config.h"
#include "shrpx_listen_handler.h"
#include "shrpx_ssl.h"
namespace shrpx {
namespace {
void ssl_acceptcb(evconnlistener *listener, int fd,
sockaddr *addr, int addrlen, void *arg)
{
ListenHandler *handler = reinterpret_cast<ListenHandler*>(arg);
handler->accept_connection(fd, addr, addrlen);
}
} // namespace
namespace {
bool is_ipv6_numeric_addr(const char *host)
{
uint8_t dst[16];
return inet_pton(AF_INET6, host, dst) == 1;
}
} // namespace
namespace {
int cache_downstream_host_address()
{
addrinfo hints;
int rv;
char service[10];
snprintf(service, sizeof(service), "%u", get_config()->downstream_port);
memset(&hints, 0, sizeof(addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
#ifdef AI_ADDRCONFIG
hints.ai_flags |= AI_ADDRCONFIG;
#endif // AI_ADDRCONFIG
addrinfo *res;
rv = getaddrinfo(get_config()->downstream_host, service, &hints, &res);
if(rv != 0) {
LOG(FATAL) << "Unable to get downstream address: " << gai_strerror(rv);
DIE();
}
char host[NI_MAXHOST];
rv = getnameinfo(res->ai_addr, res->ai_addrlen, host, sizeof(host),
0, 0, NI_NUMERICHOST);
if(rv == 0) {
LOG(INFO) << "Using first returned address for downstream "
<< host
<< ", port "
<< get_config()->downstream_port;
} else {
LOG(FATAL) << gai_strerror(rv);
DIE();
}
memcpy(&mod_config()->downstream_addr, res->ai_addr, res->ai_addrlen);
mod_config()->downstream_addrlen = res->ai_addrlen;
freeaddrinfo(res);
return 0;
}
} // namespace
namespace {
void evlistener_errorcb(evconnlistener *listener, void *ptr)
{
LOG(ERROR) << "Accepting incoming connection failed";
}
} // namespace
namespace {
evconnlistener* create_evlistener(ListenHandler *handler, int family)
{
// TODO Listen both IPv4 and IPv6
addrinfo hints;
int fd = -1;
int r;
char service[10];
snprintf(service, sizeof(service), "%u", get_config()->port);
memset(&hints, 0, sizeof(addrinfo));
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
#ifdef AI_ADDRCONFIG
hints.ai_flags |= AI_ADDRCONFIG;
#endif // AI_ADDRCONFIG
addrinfo *res, *rp;
r = getaddrinfo(get_config()->host, service, &hints, &res);
if(r != 0) {
LOG(INFO) << "Unable to get address for " << get_config()->host << ": "
<< gai_strerror(r);
return NULL;
}
for(rp = res; rp; rp = rp->ai_next) {
fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if(fd == -1) {
continue;
}
int val = 1;
if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val,
static_cast<socklen_t>(sizeof(val))) == -1) {
close(fd);
continue;
}
evutil_make_socket_nonblocking(fd);
#ifdef IPV6_V6ONLY
if(family == AF_INET6) {
if(setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &val,
static_cast<socklen_t>(sizeof(val))) == -1) {
close(fd);
continue;
}
}
#endif // IPV6_V6ONLY
if(bind(fd, rp->ai_addr, rp->ai_addrlen) == 0) {
break;
}
close(fd);
}
if(rp) {
char host[NI_MAXHOST];
r = getnameinfo(rp->ai_addr, rp->ai_addrlen, host, sizeof(host),
0, 0, NI_NUMERICHOST);
if(r == 0) {
LOG(INFO) << "Listening on " << host << ", port " << get_config()->port;
} else {
LOG(FATAL) << gai_strerror(r);
DIE();
}
}
freeaddrinfo(res);
if(rp == 0) {
if(ENABLE_LOG) {
LOG(INFO) << "Listening " << (family == AF_INET ? "IPv4" : "IPv6")
<< " socket failed";
}
return 0;
}
evconnlistener *evlistener = evconnlistener_new
(handler->get_evbase(),
ssl_acceptcb,
handler,
LEV_OPT_REUSEABLE | LEV_OPT_CLOSE_ON_FREE,
512,
fd);
evconnlistener_set_error_cb(evlistener, evlistener_errorcb);
return evlistener;
}
} // namespace
namespace {
int event_loop()
{
event_base *evbase = event_base_new();
ListenHandler *listener_handler = new ListenHandler(evbase);
evconnlistener *evlistener6, *evlistener4;
evlistener6 = create_evlistener(listener_handler, AF_INET6);
evlistener4 = create_evlistener(listener_handler, AF_INET);
if(!evlistener6 && !evlistener4) {
LOG(FATAL) << "Failed to listen on address "
<< get_config()->host << ", port " << get_config()->port;
exit(EXIT_FAILURE);
}
if(get_config()->num_worker > 1) {
listener_handler->create_worker_thread(get_config()->num_worker);
}
if(ENABLE_LOG) {
LOG(INFO) << "Entering event loop";
}
event_base_loop(evbase, 0);
if(evlistener4) {
evconnlistener_free(evlistener4);
}
if(evlistener6) {
evconnlistener_free(evlistener6);
}
return 0;
}
} // namespace
namespace {
void fill_default_config()
{
mod_config()->daemon = false;
mod_config()->server_name = "shrpx spdylay/"SPDYLAY_VERSION;
mod_config()->host = "localhost";
mod_config()->port = 3000;
mod_config()->private_key_file = 0;
mod_config()->cert_file = 0;
mod_config()->upstream_read_timeout.tv_sec = 30;
mod_config()->upstream_read_timeout.tv_usec = 0;
mod_config()->upstream_write_timeout.tv_sec = 60;
mod_config()->upstream_write_timeout.tv_usec = 0;
mod_config()->spdy_upstream_read_timeout.tv_sec = 600;
mod_config()->spdy_upstream_read_timeout.tv_usec = 0;
mod_config()->spdy_upstream_write_timeout.tv_sec = 30;
mod_config()->spdy_upstream_write_timeout.tv_usec = 0;
mod_config()->downstream_read_timeout.tv_sec = 30;
mod_config()->downstream_read_timeout.tv_usec = 0;
mod_config()->downstream_write_timeout.tv_sec = 30;
mod_config()->downstream_write_timeout.tv_usec = 0;
mod_config()->downstream_idle_read_timeout.tv_sec = 15;
mod_config()->downstream_host = "localhost";
mod_config()->downstream_port = 80;
mod_config()->num_worker = 1;
mod_config()->spdy_max_concurrent_streams =
SPDYLAY_INITIAL_MAX_CONCURRENT_STREAMS;
}
} // namespace
namespace {
int split_host_port(char *host, size_t hostlen, uint16_t *port_ptr,
const char *hostport)
{
// host and port in |hostport| is separated by single ','.
const char *p = strchr(hostport, ',');
if(!p) {
std::cerr << "Invalid host, port: " << hostport << std::endl;
return -1;
}
size_t len = p-hostport;
if(hostlen < len+1) {
std::cerr << "Hostname too long: " << hostport << std::endl;
return -1;
}
memcpy(host, hostport, len);
host[len] = '\0';
errno = 0;
unsigned long d = strtoul(p+1, 0, 10);
if(errno == 0 && 1 <= d && d <= std::numeric_limits<uint16_t>::max()) {
*port_ptr = d;
return 0;
} else {
std::cerr << "Port is invalid: " << p+1 << std::endl;
return -1;
}
}
} // namespace
namespace {
void print_usage(std::ostream& out)
{
out << "Usage: shrpx [-Dhs] [-b <HOST,PORT>] [-f <HOST,PORT>] [-n <CORES>]\n"
<< " [-c <NUM>] [-L <LEVEL>] <PRIVATE_KEY> <CERT>\n"
<< "\n"
<< "A reverse proxy for SPDY/HTTPS.\n"
<< std::endl;
}
} // namespace
namespace {
void print_help(std::ostream& out)
{
fill_default_config();
print_usage(out);
out << "\n"
<< "OPTIONS:\n"
<< " -b, --backend=<HOST,PORT>\n"
<< " Set backend host and port.\n"
<< " Default: '"
<< get_config()->downstream_host << ","
<< get_config()->downstream_port << "'\n"
<< " -f, --frontend=<HOST,PORT>\n"
<< " Set frontend host and port.\n"
<< " Default: '"
<< get_config()->host << "," << get_config()->port << "'\n"
<< " -n, --workers=<CORES>\n"
<< " Set the number of worker threads.\n"
<< " Default: "
<< get_config()->num_worker << "\n"
<< " -c, --spdy-max-concurrent-streams=<NUM>\n"
<< " Set the maximum number of the concurrent\n"
<< " streams in one SPDY session.\n"
<< " Default: "
<< get_config()->spdy_max_concurrent_streams << "\n"
<< " -L, --log-level=<LEVEL>\n"
<< " Set the severity level of log output.\n"
<< " INFO, WARNING, ERROR and FATAL.\n"
<< " Default: WARNING\n"
<< " -D, --daemon Run in a background. If -D is used, the\n"
<< " current working directory is changed to '/'.\n"
<< " -s, --spdy-proxy SSL/SPDY proxy mode.\n"
<< " --add-x-forwarded-for\n"
<< " Append X-Forwarded-For header field to the\n"
<< " downstream request.\n"
<< " -h, --help Print this help.\n"
<< std::endl;
}
} // namespace
int main(int argc, char **argv)
{
Log::set_severity_level(WARNING);
create_config();
fill_default_config();
char frontend_host[NI_MAXHOST];
uint16_t frontend_port;
char backend_host[NI_MAXHOST];
uint16_t backend_port;
while(1) {
int flag;
static option long_options[] = {
{"backend", required_argument, 0, 'b' },
{"frontend", required_argument, 0, 'f' },
{"workers", required_argument, 0, 'n' },
{"spdy-max-concurrent-streams", required_argument, 0, 'c' },
{"log-level", required_argument, 0, 'L' },
{"daemon", no_argument, 0, 'D' },
{"spdy-proxy", no_argument, 0, 's' },
{"add-x-forwarded-for", no_argument, &flag, 1},
{"help", no_argument, 0, 'h' },
{0, 0, 0, 0 }
};
int option_index = 0;
int c = getopt_long(argc, argv, "DL:sb:c:f:n:h", long_options,
&option_index);
if(c == -1) {
break;
}
switch(c) {
case 'D':
mod_config()->daemon = true;
break;
case 'h':
print_help(std::cout);
exit(EXIT_SUCCESS);
case 'L':
if(Log::set_severity_level_by_name(optarg) == -1) {
std::cerr << "Invalid severity level: " << optarg << std::endl;
exit(EXIT_SUCCESS);
}
break;
case 'b':
if(split_host_port(backend_host, sizeof(backend_host),
&backend_port, optarg) == -1) {
exit(EXIT_FAILURE);
} else {
mod_config()->downstream_host = backend_host;
mod_config()->downstream_port = backend_port;
}
break;
case 'f':
if(split_host_port(frontend_host, sizeof(frontend_host),
&frontend_port, optarg) == -1) {
exit(EXIT_FAILURE);
} else {
mod_config()->host = frontend_host;
mod_config()->port = frontend_port;
}
break;
case 'n':
mod_config()->num_worker = strtol(optarg, 0, 10);
break;
case 'c':
mod_config()->spdy_max_concurrent_streams = strtol(optarg, 0, 10);
break;
case 's':
mod_config()->spdy_proxy = true;
break;
case '?':
exit(EXIT_FAILURE);
case 0:
switch(flag) {
case 1:
// --add-x-forwarded-for
mod_config()->add_x_forwarded_for = true;
break;
default:
break;
}
break;
default:
break;
}
}
if(argc-optind < 2) {
print_usage(std::cerr);
std::cerr << "Too few arguments" << std::endl;
exit(EXIT_FAILURE);
}
mod_config()->private_key_file = argv[optind++];
mod_config()->cert_file = argv[optind++];
char hostport[NI_MAXHOST+16];
bool downstream_ipv6_addr =
is_ipv6_numeric_addr(get_config()->downstream_host);
if(get_config()->downstream_port == 80) {
snprintf(hostport, sizeof(hostport), "%s%s%s",
downstream_ipv6_addr ? "[" : "",
get_config()->downstream_host,
downstream_ipv6_addr ? "]" : "");
} else {
snprintf(hostport, sizeof(hostport), "%s%s%s:%u",
downstream_ipv6_addr ? "[" : "",
get_config()->downstream_host,
downstream_ipv6_addr ? "]" : "",
get_config()->downstream_port);
}
mod_config()->downstream_hostport = hostport;
if(cache_downstream_host_address() == -1) {
exit(EXIT_FAILURE);
}
if(get_config()->daemon) {
if(daemon(0, 0) == -1) {
perror("daemon");
exit(EXIT_FAILURE);
}
}
struct sigaction act;
memset(&act, 0, sizeof(struct sigaction));
act.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &act, 0);
OpenSSL_add_all_algorithms();
SSL_load_error_strings();
SSL_library_init();
ssl::setup_ssl_lock();
event_loop();
ssl::teardown_ssl_lock();
return 0;
}
} // namespace shrpx
int main(int argc, char **argv)
{
return shrpx::main(argc, argv);
}
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