about summary refs log tree commit diff stats
path: root/091socket.cc
blob: 7b6ca5b1b6450f01535ea8f6bf478cece0e8b8a9 (plain) (blame)
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
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
:(before "End Types")
struct socket_t {
  int fd;
  sockaddr_in addr;
  bool polled;
  socket_t() {
    fd = 0;
    polled = false;
    bzero(&addr, sizeof(addr));
  }
};

:(before "End Primitive Recipe Declarations")
_OPEN_CLIENT_SOCKET,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$open-client-socket", _OPEN_CLIENT_SOCKET);
:(before "End Primitive Recipe Checks")
case _OPEN_CLIENT_SOCKET: {
  if (SIZE(inst.ingredients) != 2) {
    raise << maybe(get(Recipe, r).name) << "'$open-client-socket' requires exactly two ingredients, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_text(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of '$open-client-socket' should be text (the hostname), but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(1))) {
    raise << maybe(get(Recipe, r).name) << "second ingredient of '$open-client-socket' should be a number (the port of the hostname to connect to), but got '" << to_string(inst.ingredients.at(1)) << "'\n" << end();
    break;
  }
  if (SIZE(inst.products) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$open-client-socket' requires exactly one product, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.products.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first product of '$open-client-socket' should be a number (socket handle), but got '" << to_string(inst.products.at(0)) << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case _OPEN_CLIENT_SOCKET: {
  string host = read_mu_text(ingredients.at(0).at(0));
  int port = ingredients.at(1).at(0);
  socket_t* client = client_socket(host, port);
  products.resize(1);
  if (client->fd < 0) {  // error
    delete client;
    products.at(0).push_back(0);
    break;
  }
  long long int result = reinterpret_cast<long long int>(client);
  products.at(0).push_back(static_cast<double>(result));
  break;
}
:(code)
socket_t* client_socket(const string& host, int port) {
  socket_t* result = new socket_t;
  result->fd = socket(AF_INET, SOCK_STREAM, 0);
  if (result->fd < 0) {
    raise << "Failed to create socket.\n" << end();
    return result;
  }
  result->addr.sin_family = AF_INET;
  hostent* tmp = gethostbyname(host.c_str());
  bcopy(tmp->h_addr, reinterpret_cast<char*>(&result->addr.sin_addr.s_addr), tmp->h_length);
  result->addr.sin_port = htons(port);
  if (connect(result->fd, reinterpret_cast<sockaddr*>(&result->addr), sizeof(result->addr)) < 0) {
    close(result->fd);
    result->fd = -1;
    raise << "Failed to connect to " << host << ':' << port << '\n' << end();
  }
  return result;
}

:(before "End Primitive Recipe Declarations")
_OPEN_SERVER_SOCKET,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$open-server-socket", _OPEN_SERVER_SOCKET);
:(before "End Primitive Recipe Checks")
case _OPEN_SERVER_SOCKET: {
  if (SIZE(inst.ingredients) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$open-server-socket' requires exactly one ingredient (the port to listen for requests on), but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of '$open-server-socket' should be a number, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
    break;
  }
  if (SIZE(inst.products) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$open-server-socket' requires exactly one product, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.products.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first product of '$open-server-socket' should be a number (file handle), but got '" << to_string(inst.products.at(0)) << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case _OPEN_SERVER_SOCKET: {
  int port = ingredients.at(0).at(0);
  socket_t* server = server_socket(port);
  products.resize(1);
  if (server->fd < 0) {
    delete server;
    products.at(0).push_back(0);
    break;
  }
  long long int result = reinterpret_cast<long long int>(server);
  products.at(0).push_back(static_cast<double>(result));
  break;
}
:(code)
socket_t* server_socket(int port) {
  socket_t* result = new socket_t;
  result->fd = socket(AF_INET, SOCK_STREAM, 0);
  if (result->fd < 0) {
    raise << "Failed to create server socket.\n" << end();
    return result;
  }
  int dummy = 0;
  setsockopt(result->fd, SOL_SOCKET, SO_REUSEADDR, &dummy, sizeof(dummy));
  result->addr.sin_family = AF_INET;
  result->addr.sin_addr.s_addr = Current_scenario ? htonl(INADDR_LOOPBACK) : INADDR_ANY;  // run tests without running afoul of any firewall
  result->addr.sin_port = htons(port);
  if (bind(result->fd, reinterpret_cast<sockaddr*>(&result->addr), sizeof(result->addr)) >= 0) {
    listen(result->fd, /*queue length*/5);
  }
  else {
    close(result->fd);
    result->fd = -1;
    raise << "Failed to bind result socket to port " << port << ". Something's already using that port.\n" << end();
  }
  return result;
}

:(before "End Primitive Recipe Declarations")
_ACCEPT,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$accept", _ACCEPT);
:(before "End Primitive Recipe Checks")
case _ACCEPT: {
  if (SIZE(inst.ingredients) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$accept' requires exactly one ingredient, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of '$accept' should be a number, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
    break;
  }
  if (SIZE(inst.products) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$accept' requires exactly one product, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.products.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first product of '$accept' should be a number (file handle), but got '" << to_string(inst.products.at(0)) << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case _ACCEPT: {
  products.resize(2);
  products.at(1).push_back(ingredients.at(0).at(0));  // indicate it modifies its ingredient
  long long int x = static_cast<long long int>(ingredients.at(0).at(0));
  socket_t* server = reinterpret_cast<socket_t*>(x);
  if (server) {
    socket_t* session = accept_session(server);
    long long int result = reinterpret_cast<long long int>(session);
    products.at(0).push_back(static_cast<double>(result));
  }
  else {
    products.at(0).push_back(0);
  }
  break;
}
:(code)
socket_t* accept_session(socket_t* server) {
  if (server->fd == 0) return NULL;
  socket_t* result = new socket_t;
  socklen_t dummy = sizeof(result->addr);
  result->fd = accept(server->fd, reinterpret_cast<sockaddr*>(&result->addr), &dummy);
  return result;
}

:(before "End Primitive Recipe Declarations")
_READ_FROM_SOCKET,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$read-from-socket", _READ_FROM_SOCKET);
:(before "End Primitive Recipe Checks")
case _READ_FROM_SOCKET: {
  if (SIZE(inst.ingredients) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$read-from-socket' requires exactly one ingredient, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of '$read-from-socket' should be a number (socket), but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
    break;
  }
  int nprod = SIZE(inst.products);
  if (nprod == 0 || nprod > 4) {
    raise << maybe(get(Recipe, r).name) << "'$read-from-socket' requires 1-4 products, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_character(inst.products.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first product of '$read-from-socket' should be a character, but got '" << to_string(inst.products.at(0)) << "'\n" << end();
    break;
  }
  if (nprod > 1 && !is_mu_boolean(inst.products.at(1))) {
    raise << maybe(get(Recipe, r).name) << "second product of '$read-from-socket' should be a boolean (data received?), but got '" << to_string(inst.products.at(1)) << "'\n" << end();
    break;
  }
  if (nprod > 2 && !is_mu_boolean(inst.products.at(2))) {
    raise << maybe(get(Recipe, r).name) << "third product of '$read-from-socket' should be a boolean (eof?), but got '" << to_string(inst.products.at(2)) << "'\n" << end();
    break;
  }
  if (nprod > 3 && !is_mu_number(inst.products.at(3))) {
    raise << maybe(get(Recipe, r).name) << "fourth product of '$read-from-socket' should be a number (error code), but got '" << to_string(inst.products.at(3)) << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case _READ_FROM_SOCKET: {
  products.resize(4);
  long long int x = static_cast<long long int>(ingredients.at(0).at(0));
  socket_t* socket = reinterpret_cast<socket_t*>(x);
  // 1. we'd like to simply read() from the socket
  // however read() on a socket never returns EOF, so we wouldn't know when to stop
  // 2. recv() can signal EOF, but it also signals "no data yet" in the beginning
  // so use poll() in the beginning to wait for data before calling recv()
  // 3. but poll() will block on EOF, so only use poll() on the very first
  // $read-from-socket on a socket
  //
  // Also, there was an unresolved issue where attempts to read() a small
  // number of bytes (less than 447 on Linux and Mac) would cause browsers to
  // prematurely close the connection. See commit 3403. That seems to be gone
  // after moving to recv()+poll(). It was never observed on OpenBSD.
  if (!socket->polled) {
    pollfd p;
    bzero(&p, sizeof(p));
    p.fd = socket->fd;
    p.events = POLLIN | POLLHUP;
    int poll_result = poll(&p, /*num pollfds*/1, /*timeout*/100/*ms*/);
    if (poll_result == 0) {
      products.at(0).push_back(/*no data*/0);
      products.at(1).push_back(/*found*/false);
      products.at(2).push_back(/*eof*/false);
      products.at(3).push_back(/*error*/0);
      break;
    }
    else if (poll_result < 0) {
      int error_code = errno;
      raise << maybe(current_recipe_name()) << "error in $read-from-socket\n" << end();
      products.at(0).push_back(/*no data*/0);
      products.at(1).push_back(/*found*/false);
      products.at(2).push_back(/*eof*/false);
      products.at(3).push_back(error_code);
      break;
    }
    socket->polled = true;
  }
  char c = '\0';
  int error_code = 0;
  int bytes_read = recv(socket->fd, &c, /*single byte*/1, MSG_DONTWAIT);
  if (bytes_read < 0) error_code = errno;
//?   if (error_code) {
//?     ostringstream out;
//?     out << "error in $read-from-socket " << socket->fd;
//?     perror(out.str().c_str());
//?   }
  products.at(0).push_back(c);
  products.at(1).push_back(/*found*/true);
  products.at(2).push_back(/*eof*/bytes_read <= 0);
  products.at(3).push_back(error_code);
  break;
}

:(before "End Primitive Recipe Declarations")
_WRITE_TO_SOCKET,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$write-to-socket", _WRITE_TO_SOCKET);
:(before "End Primitive Recipe Checks")
case _WRITE_TO_SOCKET: {
  if (SIZE(inst.ingredients) != 2) {
    raise << maybe(get(Recipe, r).name) << "'$write-to-socket' requires exactly two ingredient, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case _WRITE_TO_SOCKET: {
  long long int x = static_cast<long long int>(ingredients.at(0).at(0));
  socket_t* socket = reinterpret_cast<socket_t*>(x);
  // write just one character at a time to the socket
  long long int y = static_cast<long long int>(ingredients.at(1).at(0));
  char c = static_cast<char>(y);
  if (write(socket->fd, &c, 1) != 1) {
    raise << maybe(current_recipe_name()) << "failed to write to socket\n" << end();
    exit(0);
  }
  products.resize(1);
  products.at(0).push_back(ingredients.at(0).at(0));
  break;
}

:(before "End Primitive Recipe Declarations")
_CLOSE_SOCKET,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$close-socket", _CLOSE_SOCKET);
:(before "End Primitive Recipe Checks")
case _CLOSE_SOCKET: {
  if (SIZE(inst.ingredients) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$close-socket' requires exactly two ingredient, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of '$close-socket' should be a number, but got '" << to_string(inst.ingredients.at(0)) << "'\n" << end();
    break;
  }
  if (SIZE(inst.products) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$close-socket' requires exactly one product, but got '" << to_original_string(inst) << "'\n" << end();
    break;
  }
  if (inst.products.at(0).name != inst.ingredients.at(0).name) {
    raise << maybe(get(Recipe, r).name) << "product of '$close-socket' must be first ingredient '" << inst.ingredients.at(0).original_string << "', but got '" << inst.products.at(0).original_string << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case _CLOSE_SOCKET: {
  long long int x = static_cast<long long int>(ingredients.at(0).at(0));
  socket_t* socket = reinterpret_cast<socket_t*>(x);
  close(socket->fd);
  delete socket;
  products.resize(1);
  products.at(0).push_back(0);  // make sure we can't reuse the socket
  break;
}

:(before "End Includes")
#include <netinet/in.h>
#include <netdb.h>
#include <poll.h>
#include <sys/socket.h>
#include <unistd.h>