directory.c 7.55 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/* Copyright 2001,2002 Roger Dingledine, Matej Pfafar. */
/* See LICENSE for licensing information */
/* $Id$ */

#include "or.h"

#define MAX_DIR_SIZE 50000 /* XXX, big enough? */

/********* START VARIABLES **********/

extern or_options_t options; /* command-line and config-file options */

static char the_directory[MAX_DIR_SIZE+1];
static int directorylen=0;

static char getstring[] = "GET / HTTP/1.0\n\r";

/********* END VARIABLES ************/

void directory_initiate_fetch(routerinfo_t *router) {
  connection_t *conn;
  struct sockaddr_in router_addr;
  int s;

  log(LOG_DEBUG,"directory_initiate_fetch(): initiating directory fetch");

  if(!router) /* i guess they didn't have one in mind for me to use */
    return;

  conn = connection_new(CONN_TYPE_DIR);
  if(!conn)
    return;

  /* set up conn so it's got all the data we need to remember */
  conn->addr = router->addr, conn->port = router->or_port; /* NOTE we store or_port here always */
  conn->address = strdup(router->address);
  conn->receiver_bucket = -1; /* edge connections don't do receiver buckets */
  conn->bandwidth = -1;

  s=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
  if (s < 0)
  { 
    log(LOG_ERR,"directory_initiate_fetch(): Error creating network socket.");
    connection_free(conn);
    return;
  }
  fcntl(s, F_SETFL, O_NONBLOCK); /* set s to non-blocking */

  memset((void *)&router_addr,0,sizeof(router_addr));
  router_addr.sin_family = AF_INET;
  router_addr.sin_port = htons(router->dir_port);
  router_addr.sin_addr.s_addr = router->addr;

  log(LOG_DEBUG,"directory_initiate_fetch(): Trying to connect to %s:%u.",inet_ntoa(*(struct in_addr *)&router->addr),router->dir_port);

  if(connect(s,(struct sockaddr *)&router_addr,sizeof(router_addr)) < 0){
    if(errno != EINPROGRESS){
      /* yuck. kill it. */
      connection_free(conn);
      return;
    } else {
      /* it's in progress. set state appropriately and return. */
      conn->s = s;

      if(connection_add(conn) < 0) { /* no space, forget it */
        connection_free(conn);
        return;
      }

      log(LOG_DEBUG,"directory_initiate_fetch(): connect in progress.");
      connection_watch_events(conn, POLLIN | POLLOUT); /* writable indicates finish, readable indicates broken link */
      conn->state = DIR_CONN_STATE_CONNECTING;
      return;
    }
  }

  /* it succeeded. we're connected. */
  conn->s = s;

  if(connection_add(conn) < 0) { /* no space, forget it */
    connection_free(conn);
    return;
  }

  log(LOG_DEBUG,"directory_initiate_fetch(): Connection to router %s:%u established.",router->address,router->dir_port);

  if(directory_send_command(conn) < 0) {
    connection_remove(conn);
    connection_free(conn);
  }
}

int directory_send_command(connection_t *conn) {

  assert(conn && conn->type == CONN_TYPE_DIR);

  if(connection_write_to_buf(getstring, strlen(getstring), conn) < 0) {
    log(LOG_DEBUG,"directory_send_command(): Couldn't write command to buffer.");
    return -1;
  }

  conn->state = DIR_CONN_STATE_SENDING_COMMAND;
  return 0;
}

void directory_rebuild(void) {

  dump_directory_to_string(the_directory, MAX_DIR_SIZE);
  log(LOG_DEBUG,"New directory:\n'%s'",the_directory);  
  directorylen = strlen(the_directory);

}

int connection_dir_process_inbuf(connection_t *conn) {

  assert(conn && conn->type == CONN_TYPE_DIR);

  if(conn->inbuf_reached_eof) {
    if(conn->state != DIR_CONN_STATE_READING) {
      log(LOG_DEBUG,"connection_dir_process_inbuf(): conn reached eof, not reading. Closing.");
      return -1;
    }
    /* eof reached, kill it, but first process the_directory and learn about new routers. */
    log(LOG_DEBUG,"connection_dir_process_inbuf(): conn reached eof. Processing directory.");
    log(LOG_DEBUG,"connection_dir_process_inbuf(): Received directory (size %d) '%s'", directorylen, the_directory);
    if(directorylen == 0) {
      log(LOG_DEBUG,"connection_dir_process_inbuf(): Empty directory. Ignoring.");
      return -1;
    }
    if(router_get_list_from_string(the_directory, options.ORPort) < 0) {
      log(LOG_DEBUG,"connection_dir_process_inbuf(): ...but parsing failed. Ignoring.");
    }
    return -1;
  }

  switch(conn->state) {
    case DIR_CONN_STATE_COMMAND_WAIT:
      return directory_handle_command(conn);
    case DIR_CONN_STATE_READING:
      return directory_handle_reading(conn);
    default:
      log(LOG_DEBUG,"connection_dir_process_inbuf(): Got data while writing; Ignoring.");
      break;
  }

  return 0;
}

int directory_handle_command(connection_t *conn) {

  assert(conn && conn->type == CONN_TYPE_DIR);

  if(conn->inbuf_datalen < strlen(getstring)) { /* entire response available? */
    log(LOG_DEBUG,"directory_handle_command(): Entire command not here yet. Waiting.");
    return 0; /* not yet */
  }

  /* for now, don't bother reading it. */

  if(directorylen == 0) {
    log(LOG_DEBUG,"directory_handle_command(): My directory is empty. Closing.");
    return -1;
  }

  log(LOG_DEBUG,"directory_handle_command(): Dumping directory to client."); 
  if(connection_write_to_buf(the_directory, directorylen, conn) < 0) {
    log(LOG_DEBUG,"directory_handle_command(): my outbuf is full. Oops.");
    return -1;
  }

  conn->state = DIR_CONN_STATE_WRITING;
  return 0;
}

int directory_handle_reading(connection_t *conn) {
  int amt;

  assert(conn && conn->type == CONN_TYPE_DIR);

  amt = conn->inbuf_datalen;

  if(amt + directorylen >= MAX_DIR_SIZE) {
    log(LOG_DEBUG,"directory_handle_reading(): Directory too large. Failing messily.");
    return -1;
  }

  log(LOG_DEBUG,"directory_handle_reading(): Pulling %d bytes in at offset %d.",
    amt, directorylen);

  if(connection_fetch_from_buf(the_directory+directorylen,amt,conn) < 0) {
    log(LOG_DEBUG,"directory_handle_reading(): fetch_from_buf failed.");
    return -1;    
  }

  directorylen += amt;

  the_directory[directorylen] = 0;

  return 0;
}

int connection_dir_finished_flushing(connection_t *conn) {
  int e, len=sizeof(e);

  assert(conn && conn->type == CONN_TYPE_DIR);

  switch(conn->state) {
    case DIR_CONN_STATE_CONNECTING:
      if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, &e, &len) < 0)  { /* not yet */
        if(errno != EINPROGRESS){
          /* yuck. kill it. */
          log(LOG_DEBUG,"connection_dir_finished_flushing(): in-progress connect failed. Removing.");
          return -1;
        } else {
          return 0; /* no change, see if next time is better */
        }
      }
      /* the connect has finished. */

      log(LOG_DEBUG,"connection_dir_finished_flushing(): DIR connection to router %s:%u established.",
          conn->address,conn->port);

      return directory_send_command(conn);
    case DIR_CONN_STATE_SENDING_COMMAND:
      log(LOG_DEBUG,"connection_dir_finished_flushing(): client finished sending command.");
      directorylen = 0;
      conn->state = DIR_CONN_STATE_READING;
      connection_watch_events(conn, POLLIN);
      return 0;
    case DIR_CONN_STATE_WRITING:
      log(LOG_DEBUG,"connection_dir_finished_flushing(): Finished writing directory. Closing.");
      return -1; /* kill it */
    default:
      log(LOG_DEBUG,"Bug: connection_dir_finished_flushing() called in unexpected state.");
      return 0;
  }

  return 0;
}

int connection_dir_create_listener(crypto_pk_env_t *prkey, struct sockaddr_in *local) {
  log(LOG_DEBUG,"connection_create_dir_listener starting");
  return connection_create_listener(prkey, local, CONN_TYPE_DIR_LISTENER);
}

int connection_dir_handle_listener_read(connection_t *conn) {
  log(LOG_NOTICE,"Dir: Received a connection request. Waiting for command.");
  return connection_handle_listener_read(conn, CONN_TYPE_DIR, DIR_CONN_STATE_COMMAND_WAIT);
}