flip_in_mem_edsm_server.cc revision 72a454cd3513ac24fbdd0e0cb9ad70b86a99b801 
1// Copyright (c) 2009 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include <errno.h>
6#include <signal.h>
7#include <sys/file.h>
8
9#include <iostream>
10#include <string>
11#include <vector>
12
13#include "base/command_line.h"
14#include "base/logging.h"
15#include "base/synchronization/lock.h"
16#include "base/timer.h"
17#include "net/tools/flip_server/acceptor_thread.h"
18#include "net/tools/flip_server/constants.h"
19#include "net/tools/flip_server/flip_config.h"
20#include "net/tools/flip_server/output_ordering.h"
21#include "net/tools/flip_server/sm_connection.h"
22#include "net/tools/flip_server/sm_interface.h"
23#include "net/tools/flip_server/spdy_interface.h"
24#include "net/tools/flip_server/split.h"
25
26using std::cout;
27using std::cerr;
28
29// If true, then disables the nagle algorithm);
30bool FLAGS_disable_nagle = true;
31
32// The number of times that accept() will be called when the
33//  alarm goes off when the accept_using_alarm flag is set to true.
34//  If set to 0, accept() will be performed until the accept queue
35//  is completely drained and the accept() call returns an error);
36int32 FLAGS_accepts_per_wake = 0;
37
38// The size of the TCP accept backlog);
39int32 FLAGS_accept_backlog_size = 1024;
40
41// If set to false a single socket will be used. If set to true
42//  then a new socket will be created for each accept thread.
43//  Note that this only works with kernels that support
44//  SO_REUSEPORT);
45bool FLAGS_reuseport = false;
46
47// Flag to force spdy, even if NPN is not negotiated.
48bool FLAGS_force_spdy = false;
49
50// The amount of time the server delays before sending back the
51//  reply);
52double FLAGS_server_think_time_in_s = 0;
53
54net::FlipConfig g_proxy_config;
55
56////////////////////////////////////////////////////////////////////////////////
57
58std::vector<std::string> &split(const std::string &s,
59                                char delim,
60                                std::vector<std::string> &elems) {
61  std::stringstream ss(s);
62  std::string item;
63  while(std::getline(ss, item, delim)) {
64    elems.push_back(item);
65  }
66  return elems;
67}
68
69std::vector<std::string> split(const std::string &s, char delim) {
70  std::vector<std::string> elems;
71  return split(s, delim, elems);
72}
73
74bool GotQuitFromStdin() {
75  // Make stdin nonblocking. Yes this is done each time. Oh well.
76  fcntl(0, F_SETFL, O_NONBLOCK);
77  char c;
78  std::string maybequit;
79  while (read(0, &c, 1) > 0) {
80    maybequit += c;
81  }
82  if (maybequit.size()) {
83    VLOG(1) << "scanning string: \"" << maybequit << "\"";
84  }
85  return (maybequit.size() > 1 &&
86          (maybequit.c_str()[0] == 'q' ||
87           maybequit.c_str()[0] == 'Q'));
88}
89
90const char* BoolToStr(bool b) {
91  if (b)
92    return "true";
93  return "false";
94}
95
96////////////////////////////////////////////////////////////////////////////////
97
98static bool wantExit = false;
99static bool wantLogClose = false;
100void SignalHandler(int signum)
101{
102  switch(signum) {
103    case SIGTERM:
104    case SIGINT:
105      wantExit = true;
106      break;
107    case SIGHUP:
108      wantLogClose = true;
109      break;
110  }
111}
112
113static int OpenPidFile(const char *pidfile)
114{
115  int fd;
116  struct stat pid_stat;
117  int ret;
118
119  fd = open(pidfile, O_RDWR | O_CREAT, 0600);
120  if (fd == -1) {
121      cerr << "Could not open pid file '" << pidfile << "' for reading.\n";
122      exit(1);
123  }
124
125  ret = flock(fd, LOCK_EX | LOCK_NB);
126  if (ret == -1) {
127    if (errno == EWOULDBLOCK) {
128      cerr << "Flip server is already running.\n";
129    } else {
130      cerr << "Error getting lock on pid file: " << strerror(errno) << "\n";
131    }
132    exit(1);
133  }
134
135  if (fstat(fd, &pid_stat) == -1) {
136    cerr << "Could not stat pid file '" << pidfile << "': " << strerror(errno)
137         << "\n";
138  }
139  if (pid_stat.st_size != 0) {
140    if (ftruncate(fd, pid_stat.st_size) == -1) {
141      cerr << "Could not truncate pid file '" << pidfile << "': "
142           << strerror(errno) << "\n";
143    }
144  }
145
146  char pid_str[8];
147  snprintf(pid_str, sizeof(pid_str), "%d", getpid());
148  int bytes = static_cast<int>(strlen(pid_str));
149  if (write(fd, pid_str, strlen(pid_str)) != bytes) {
150    cerr << "Could not write pid file: " << strerror(errno) << "\n";
151    close(fd);
152    exit(1);
153  }
154
155  return fd;
156}
157
158int main (int argc, char**argv)
159{
160  unsigned int i = 0;
161  bool wait_for_iface = false;
162  int pidfile_fd;
163
164  signal(SIGPIPE, SIG_IGN);
165  signal(SIGTERM, SignalHandler);
166  signal(SIGINT, SignalHandler);
167  signal(SIGHUP, SignalHandler);
168
169  CommandLine::Init(argc, argv);
170  CommandLine cl(argc, argv);
171
172  if (cl.HasSwitch("help") || argc < 2) {
173    cout << argv[0] << " <options>\n";
174    cout << "  Proxy options:\n";
175    cout << "\t--proxy<1..n>=\"<listen ip>,<listen port>,"
176         << "<ssl cert filename>,\n"
177         << "\t               <ssl key filename>,<http server ip>,"
178         << "<http server port>,\n"
179         << "\t               [https server ip],[https server port],"
180         << "<spdy only 0|1>\"\n";
181    cout << "\t  * The https server ip and port may be left empty if they are"
182         << " the same as\n"
183         << "\t    the http server fields.\n";
184    cout << "\t  * spdy only prevents non-spdy https connections from being"
185         << " passed\n"
186         << "\t    through the proxy listen ip:port.\n";
187    cout << "\t--forward-ip-header=<header name>\n";
188    cout << "\n  Server options:\n";
189    cout << "\t--spdy-server=\"<listen ip>,<listen port>,[ssl cert filename],"
190         << "\n\t               [ssl key filename]\"\n";
191    cout << "\t--http-server=\"<listen ip>,<listen port>,[ssl cert filename],"
192         << "\n\t               [ssl key filename]\"\n";
193    cout << "\t  * Leaving the ssl cert and key fields empty will disable ssl"
194         << " for the\n"
195         << "\t    http and spdy flip servers\n";
196    cout << "\n  Global options:\n";
197    cout << "\t--logdest=<file|system|both>\n";
198    cout << "\t--logfile=<logfile>\n";
199    cout << "\t--wait-for-iface\n";
200    cout << "\t  * The flip server will block until the listen ip has been"
201         << " raised.\n";
202    cout << "\t--ssl-session-expiry=<seconds> (default is 300)\n";
203    cout << "\t--ssl-disable-compression\n";
204    cout << "\t--idle-timeout=<seconds> (default is 300)\n";
205    cout << "\t--pidfile=<filepath> (default /var/run/flip-server.pid)\n";
206    cout << "\t--help\n";
207    exit(0);
208  }
209
210  if (cl.HasSwitch("pidfile")) {
211    pidfile_fd = OpenPidFile(cl.GetSwitchValueASCII("pidfile").c_str());
212  } else {
213    pidfile_fd = OpenPidFile(PIDFILE);
214  }
215
216  net::OutputOrdering::set_server_think_time_in_s(FLAGS_server_think_time_in_s);
217
218  if (cl.HasSwitch("forward-ip-header")) {
219    net::SpdySM::set_forward_ip_header(
220        cl.GetSwitchValueASCII("forward-ip-header"));
221  }
222
223  if (cl.HasSwitch("logdest")) {
224    std::string log_dest_value = cl.GetSwitchValueASCII("logdest");
225    if (log_dest_value.compare("file") == 0) {
226      g_proxy_config.log_destination_ = logging::LOG_ONLY_TO_FILE;
227    } else if (log_dest_value.compare("system") == 0) {
228      g_proxy_config.log_destination_ = logging::LOG_ONLY_TO_SYSTEM_DEBUG_LOG;
229    } else if (log_dest_value.compare("both") == 0) {
230      g_proxy_config.log_destination_ =
231        logging::LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG;
232    } else {
233      LOG(FATAL) << "Invalid logging destination value: " << log_dest_value;
234    }
235  } else {
236    g_proxy_config.log_destination_ = logging::LOG_NONE;
237  }
238
239  if (cl.HasSwitch("logfile")) {
240    g_proxy_config.log_filename_ = cl.GetSwitchValueASCII("logfile");
241    if (g_proxy_config.log_destination_ == logging::LOG_NONE) {
242      g_proxy_config.log_destination_ = logging::LOG_ONLY_TO_FILE;
243    }
244  } else if (g_proxy_config.log_destination_ == logging::LOG_ONLY_TO_FILE ||
245             g_proxy_config.log_destination_ ==
246             logging::LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG) {
247    LOG(FATAL) << "Logging destination requires a log file to be specified.";
248  }
249
250  if (cl.HasSwitch("wait-for-iface")) {
251    wait_for_iface = true;
252  }
253
254  if (cl.HasSwitch("ssl-session-expiry")) {
255    std::string session_expiry = cl.GetSwitchValueASCII("ssl-session-expiry");
256    g_proxy_config.ssl_session_expiry_ = atoi(session_expiry.c_str());
257  }
258
259  if (cl.HasSwitch("ssl-disable-compression")) {
260    g_proxy_config.ssl_disable_compression_ = true;
261  }
262
263  if (cl.HasSwitch("idle-timeout")) {
264    g_proxy_config.idle_socket_timeout_s_ =
265      atoi(cl.GetSwitchValueASCII("idle-timeout").c_str());
266  }
267
268  if (cl.HasSwitch("force_spdy"))
269    net::SMConnection::set_force_spdy(true);
270
271  InitLogging(g_proxy_config.log_filename_.c_str(),
272              g_proxy_config.log_destination_,
273              logging::DONT_LOCK_LOG_FILE,
274              logging::APPEND_TO_OLD_LOG_FILE,
275              logging::DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS);
276
277  LOG(INFO) << "Flip SPDY proxy started with configuration:";
278  LOG(INFO) << "Logging destination     : " << g_proxy_config.log_destination_;
279  LOG(INFO) << "Log file                : " << g_proxy_config.log_filename_;
280  LOG(INFO) << "Forward IP Header       : "
281            << (net::SpdySM::forward_ip_header().length() ?
282               net::SpdySM::forward_ip_header() : "<disabled>");
283  LOG(INFO) << "Wait for interfaces     : " << (wait_for_iface?"true":"false");
284  LOG(INFO) << "Accept backlog size     : " << FLAGS_accept_backlog_size;
285  LOG(INFO) << "Accepts per wake        : " << FLAGS_accepts_per_wake;
286  LOG(INFO) << "Disable nagle           : "
287            << (FLAGS_disable_nagle?"true":"false");
288  LOG(INFO) << "Reuseport               : "
289            << (FLAGS_reuseport?"true":"false");
290  LOG(INFO) << "Force SPDY              : "
291            << (FLAGS_force_spdy?"true":"false");
292  LOG(INFO) << "SSL session expiry      : "
293            << g_proxy_config.ssl_session_expiry_;
294  LOG(INFO) << "SSL disable compression : "
295            << g_proxy_config.ssl_disable_compression_;
296  LOG(INFO) << "Connection idle timeout : "
297            << g_proxy_config.idle_socket_timeout_s_;
298
299  // Proxy Acceptors
300  while (true) {
301    i += 1;
302    std::stringstream name;
303    name << "proxy" << i;
304    if (!cl.HasSwitch(name.str())) {
305      break;
306    }
307    std::string value = cl.GetSwitchValueASCII(name.str());
308    std::vector<std::string> valueArgs = split(value, ',');
309    CHECK_EQ((unsigned int)9, valueArgs.size());
310    int spdy_only = atoi(valueArgs[8].c_str());
311    // If wait_for_iface is enabled, then this call will block
312    // indefinitely until the interface is raised.
313    g_proxy_config.AddAcceptor(net::FLIP_HANDLER_PROXY,
314                               valueArgs[0], valueArgs[1],
315                               valueArgs[2], valueArgs[3],
316                               valueArgs[4], valueArgs[5],
317                               valueArgs[6], valueArgs[7],
318                               spdy_only,
319                               FLAGS_accept_backlog_size,
320                               FLAGS_disable_nagle,
321                               FLAGS_accepts_per_wake,
322                               FLAGS_reuseport,
323                               wait_for_iface,
324                               NULL);
325  }
326
327  // Spdy Server Acceptor
328  net::MemoryCache spdy_memory_cache;
329  if (cl.HasSwitch("spdy-server")) {
330    spdy_memory_cache.AddFiles();
331    std::string value = cl.GetSwitchValueASCII("spdy-server");
332    std::vector<std::string> valueArgs = split(value, ',');
333    g_proxy_config.AddAcceptor(net::FLIP_HANDLER_SPDY_SERVER,
334                               valueArgs[0], valueArgs[1],
335                               valueArgs[2], valueArgs[3],
336                               "", "", "", "",
337                               0,
338                               FLAGS_accept_backlog_size,
339                               FLAGS_disable_nagle,
340                               FLAGS_accepts_per_wake,
341                               FLAGS_reuseport,
342                               wait_for_iface,
343                               &spdy_memory_cache);
344  }
345
346  // Spdy Server Acceptor
347  net::MemoryCache http_memory_cache;
348  if (cl.HasSwitch("http-server")) {
349    http_memory_cache.AddFiles();
350    std::string value = cl.GetSwitchValueASCII("http-server");
351    std::vector<std::string> valueArgs = split(value, ',');
352    g_proxy_config.AddAcceptor(net::FLIP_HANDLER_HTTP_SERVER,
353                               valueArgs[0], valueArgs[1],
354                               valueArgs[2], valueArgs[3],
355                               "", "", "", "",
356                               0,
357                               FLAGS_accept_backlog_size,
358                               FLAGS_disable_nagle,
359                               FLAGS_accepts_per_wake,
360                               FLAGS_reuseport,
361                               wait_for_iface,
362                               &http_memory_cache);
363  }
364
365  std::vector<net::SMAcceptorThread*> sm_worker_threads_;
366
367  for (i = 0; i < g_proxy_config.acceptors_.size(); i++) {
368    net::FlipAcceptor *acceptor = g_proxy_config.acceptors_[i];
369
370    sm_worker_threads_.push_back(
371        new net::SMAcceptorThread(acceptor,
372                                  (net::MemoryCache *)acceptor->memory_cache_));
373    // Note that spdy_memory_cache is not threadsafe, it is merely
374    // thread compatible. Thus, if ever we are to spawn multiple threads,
375    // we either must make the MemoryCache threadsafe, or use
376    // a separate MemoryCache for each thread.
377    //
378    // The latter is what is currently being done as we spawn
379    // a separate thread for each http and spdy server acceptor.
380
381    sm_worker_threads_.back()->InitWorker();
382    sm_worker_threads_.back()->Start();
383  }
384
385  while (!wantExit) {
386    // Close logfile when HUP signal is received. Logging system will
387    // automatically reopen on next log message.
388    if ( wantLogClose ) {
389      wantLogClose = false;
390      VLOG(1) << "HUP received, reopening log file.";
391      logging::CloseLogFile();
392    }
393    if (GotQuitFromStdin()) {
394      for (unsigned int i = 0; i < sm_worker_threads_.size(); ++i) {
395        sm_worker_threads_[i]->Quit();
396      }
397      for (unsigned int i = 0; i < sm_worker_threads_.size(); ++i) {
398        sm_worker_threads_[i]->Join();
399      }
400      break;
401    }
402    usleep(1000*10);  // 10 ms
403  }
404
405  unlink(PIDFILE);
406  close(pidfile_fd);
407  return 0;
408}
409
410