summaryrefslogtreecommitdiff
path: root/src/c/request.c
blob: 5aee7bbeac608ed1a99be51e35c0ed5c11f5d616 (plain)
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
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
#include "config.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <signal.h>

#include <pthread.h>

#include "urweb.h"
#include "request.h"

#define MAX_RETRIES 5

void *memmem(const void *b1, size_t len1, const void *b2, size_t len2);

static int try_rollback(uw_context ctx, int will_retry, void *logger_data, uw_logger log_error) {
  int r = uw_rollback(ctx, will_retry);

  if (r) {
    log_error(logger_data, "Error running SQL ROLLBACK\n");
    uw_reset(ctx);
    uw_write(ctx, "HTTP/1.1 500 Internal Server Error\r\n");
    uw_write(ctx, "Content-type: text/plain\r\n\r\n");
    uw_write(ctx, "Error running SQL ROLLBACK\n");
    uw_set_error_message(ctx, "Database error; you are probably out of storage space.");
  }

  return r;
}

uw_context uw_request_new_context(int id, uw_app *app, uw_loggers *ls) {
  void *logger_data = ls->logger_data;
  uw_logger log_debug = ls->log_debug;
  uw_logger log_error = ls->log_error;
  uw_context ctx = uw_init(id, ls);
  int retries_left = MAX_RETRIES;
  uw_set_app(ctx, app);

  while (1) {
    failure_kind fk = uw_begin_init(ctx);

    if (fk == SUCCESS) {
      log_debug(logger_data, "Database connection initialized.\n");
      break;
    } else if (fk == BOUNDED_RETRY) {
      if (retries_left) {
        log_debug(logger_data, "Initialization error triggers bounded retry: %s\n", uw_error_message(ctx));
        --retries_left;
      } else {
        log_error(logger_data, "Fatal initialization error (out of retries): %s\n", uw_error_message(ctx));
        uw_free(ctx);
        return NULL;
      }
    } else if (fk == UNLIMITED_RETRY)
      log_debug(logger_data, "Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx));
    else if (fk == FATAL) {
      log_error(logger_data, "Fatal initialization error: %s\n", uw_error_message(ctx));
      uw_free(ctx);
      return NULL;
    } else {
      log_error(logger_data, "Unknown uw_begin_init return code!\n");
      uw_free(ctx);
      return NULL;
    }
  }

  return ctx;
}

static void *ticker(void *data) {
  while (1) {
    usleep(100000);
    ++uw_time;
  }

  return NULL;
}

typedef struct {
  int id;
  uw_loggers *ls;
  uw_periodic pdic;
  uw_app *app;
} periodic;

static void *periodic_loop(void *data) {
  periodic *p = (periodic *)data;
  uw_context ctx = uw_request_new_context(p->id, p->app, p->ls);

  if (!ctx)
    exit(1);

  while (1) {
    int retries_left = MAX_RETRIES;

    failure_kind r;
    do {
      uw_reset(ctx);
      r = uw_runCallback(ctx, p->pdic.callback);
      if (r == BOUNDED_RETRY)
        --retries_left;
      else if (r == UNLIMITED_RETRY)
        p->ls->log_debug(p->ls->logger_data, "Error triggers unlimited retry in periodic: %s\n", uw_error_message(ctx));
      else if (r == BOUNDED_RETRY)
        p->ls->log_debug(p->ls->logger_data, "Error triggers bounded retry in periodic: %s\n", uw_error_message(ctx));
      else if (r == FATAL)
        p->ls->log_error(p->ls->logger_data, "Fatal error: %s\n", uw_error_message(ctx));
      if (r == FATAL || r == BOUNDED_RETRY || r == UNLIMITED_RETRY)
        if (try_rollback(ctx, 0, p->ls->logger_data, p->ls->log_error))
          return NULL;
    } while (r == UNLIMITED_RETRY || (r == BOUNDED_RETRY && retries_left > 0));

    if (r != FATAL && r != BOUNDED_RETRY) {
      if (uw_commit(ctx))
	r = UNLIMITED_RETRY;
    }

    sleep(p->pdic.period);
  };
}

static unsigned long long stackSize;

int pthread_create_big(pthread_t *outThread, void *foo, void *threadFunc, void *arg)
{
  if (stackSize > 0) {
    int err;
    pthread_attr_t stackSizeAttribute;

    err = pthread_attr_init(&stackSizeAttribute);
    if (err) return err;

    err = pthread_attr_setstacksize(&stackSizeAttribute, stackSize);
    if (err) return err;

    return pthread_create(outThread, &stackSizeAttribute, threadFunc, arg);
  } else {
    return pthread_create(outThread, NULL, threadFunc, arg);
  }
}

void uw_request_init(uw_app *app, uw_loggers* ls) {
  uw_context ctx;
  failure_kind fk;
  uw_periodic *ps;
  int id;
  char *stackSize_s;

  uw_logger log_debug = ls->log_debug;
  uw_logger log_error = ls->log_error;
  void* logger_data = ls->logger_data;

  if ((stackSize_s = getenv("URWEB_STACK_SIZE")) != NULL && stackSize_s[0] != 0) {
    stackSize = atoll(stackSize_s);

    if (stackSize <= 0) {
      fprintf(stderr, "Invalid stack size \"%s\"\n", stackSize_s);
      exit(1);
    }
  }

  uw_global_init();
  uw_app_init(app);

  {
    pthread_t thread;
    
    if (uw_time_max && pthread_create_big(&thread, NULL, ticker, NULL)) {
      fprintf(stderr, "Error creating ticker thread\n");
      exit(1);
    }
  }

  ctx = uw_request_new_context(0, app, ls);

  if (!ctx)
    exit(1);

  for (fk = uw_initialize(ctx); fk == UNLIMITED_RETRY; fk = uw_initialize(ctx)) {
    log_debug(logger_data, "Unlimited retry during init: %s\n", uw_error_message(ctx));
    uw_rollback(ctx, 1);
    uw_reset(ctx);
  }

  if (fk != SUCCESS) {
    log_error(logger_data, "Failed to initialize database!  %s\n", uw_error_message(ctx));
    uw_rollback(ctx, 0);
    exit(1);
  }

  uw_free(ctx);

  id = 1;
  for (ps = app->periodics; ps->callback; ++ps) {
    pthread_t thread;
    periodic *arg = malloc(sizeof(periodic));
    arg->id = id++;
    arg->ls = ls;
    arg->pdic = *ps;
    arg->app = app;
    
    if (pthread_create_big(&thread, NULL, periodic_loop, arg)) {
      fprintf(stderr, "Error creating periodic thread\n");
      exit(1);
    }
  }  
}


struct uw_rc {
  size_t path_copy_size, queryString_size;
  char *path_copy, *queryString;
};

uw_request_context uw_new_request_context(void) {
  uw_request_context r = malloc(sizeof(struct uw_rc));
  r->path_copy_size = 0;
  r->queryString_size = 1;
  r->path_copy = malloc(0);
  r->queryString = malloc(1);
  return r;
}

void uw_free_request_context(uw_request_context r) {
  free(r->path_copy);
  free(r->queryString);
  free(r);
}

request_result uw_request(uw_request_context rc, uw_context ctx,
                          char *method, char *path, char *query_string,
                          char *body, size_t body_len,
                          void (*on_success)(uw_context), void (*on_failure)(uw_context),
                          void *logger_data, uw_logger log_error, uw_logger log_debug,
                          int sock,
                          int (*send)(int sockfd, const void *buf, ssize_t len),
                          int (*close)(int fd)) {
  int retries_left = MAX_RETRIES;
  failure_kind fk;
  int is_post = 0;
  char *boundary = NULL;
  size_t boundary_len = 0;
  char *inputs;
  const char *prefix = uw_get_url_prefix(ctx);
  char *s;
  int had_error = 0, is_fancy = 0;
  char errmsg[ERROR_BUF_LEN];

  uw_reset(ctx);

  rc->queryString[0] = 0;

  for (s = path; *s; ++s) {
    if (s[0] == '%' && s[1] == '2' && s[2] == '7') {
      s[0] = '\'';
      memmove(s+1, s+3, strlen(s+3)+1);
    }
  }

  uw_set_currentUrl(ctx, path);

  if (!strcmp(method, "POST")) {
    char *clen_s = uw_Basis_requestHeader(ctx, "Content-length");
    if (!clen_s) {
      clen_s = "0";
      /*log_error(logger_data, "No Content-length with POST\n");
      return FAILED;*/
    }
    int clen = atoi(clen_s);
    if (clen < 0) {
      log_error(logger_data, "Negative Content-length with POST\n");
      return FAILED;
    }

    if (body_len < clen) {
      log_error(logger_data, "Request doesn't contain all POST data (according to Content-Length)\n");
      return FAILED;
    }

    is_post = 1;
    uw_isPost(ctx);

    clen_s = uw_Basis_requestHeader(ctx, "Content-type");

    if (!clen_s || strcasecmp(clen_s, "application/x-www-form-urlencoded"))
      is_fancy = 1;

    if (clen_s && !strncasecmp(clen_s, "multipart/form-data", 19)) {
      if (strncasecmp(clen_s + 19, "; boundary=", 11)) {
        log_error(logger_data, "Bad multipart boundary spec");
        return FAILED;
      }

      boundary = clen_s + 28;
      boundary[0] = '-';
      boundary[1] = '-';
      boundary_len = strlen(boundary);
    } else if (clen_s) {
      uw_Basis_postBody pb = {clen_s, body, body_len};
      uw_postBody(ctx, pb);
    }
  } else if (strcmp(method, "GET")) {
    log_error(logger_data, "Not ready for non-GET/POST command: %s\n", method);
    return FAILED;
  }

  if (!strncmp(path, prefix, strlen(prefix))
      && !strcmp(path + strlen(prefix), ".msgs")) {
    char *id = uw_Basis_requestHeader(ctx, "UrWeb-Client");
    char *pass = uw_Basis_requestHeader(ctx, "UrWeb-Pass");

    if (sock < 0) {
      log_error(logger_data, ".msgs requested, but not socket supplied\n");
      return FAILED;
    }

    if (id && pass) {
      unsigned idn = atoi(id);
      uw_client_connect(idn, atoi(pass), sock, send, close, logger_data, log_error);
      log_debug(logger_data, "Processed request for messages by client %u\n\n", idn);
      return KEEP_OPEN;
    }
    else {
      log_error(logger_data, "Missing fields in .msgs request: %s, %s\n\n", id, pass);
      return FAILED;
    }
  }

  if (boundary) {
    char *part = body, *after_sub_headers, *header, *after_header;
    size_t part_len;

    part = strstr(part, boundary);
    if (!part) {
      log_error(logger_data, "Missing first multipart boundary\n");
      return FAILED;
    }
    part += boundary_len;

    while (1) {
      char *name = NULL, *filename = NULL, *type = NULL;

      if (part[0] == '-' && part[1] == '-')
        break;

      if (*part != '\r') {
        log_error(logger_data, "No \\r after multipart boundary\n");
        return FAILED;
      }
      ++part;
      if (*part != '\n') {
        log_error(logger_data, "No \\n after multipart boundary\n");
        return FAILED;
      }
      ++part;
            
      if (!(after_sub_headers = strstr(part, "\r\n\r\n"))) {
        log_error(logger_data, "Missing end of headers after multipart boundary\n");
        return FAILED;
      }
      after_sub_headers[2] = 0;
      after_sub_headers += 4;

      for (header = part; (after_header = strstr(header, "\r\n")); header = after_header + 2) {
        char *colon, *after_colon;

        *after_header = 0;
        if (!(colon = strchr(header, ':'))) {
          log_error(logger_data, "Missing colon in multipart sub-header\n");
          return FAILED;
        }
        *colon++ = 0;
        if (*colon++ != ' ') {
          log_error(logger_data, "No space after colon in multipart sub-header\n");
          return FAILED;
        }
        
        if (!strcasecmp(header, "Content-Disposition")) {
          if (strncmp(colon, "form-data; ", 11)) {
            log_error(logger_data, "Multipart data is not \"form-data\"\n");
            return FAILED;
          }

          for (colon += 11; (after_colon = strchr(colon, '=')); colon = after_colon) {
            char *data;
            after_colon[0] = 0;
            if (after_colon[1] != '"') {
              log_error(logger_data, "Disposition setting is missing initial quote\n");
              return FAILED;
            }
            data = after_colon+2;
            if (!(after_colon = strchr(data, '"'))) {
              log_error(logger_data, "Disposition setting is missing final quote\n");
              return FAILED;
            }
            after_colon[0] = 0;
            ++after_colon;
            if (after_colon[0] == ';' && after_colon[1] == ' ')
              after_colon += 2;

            if (!strcasecmp(colon, "name"))
              name = data;
            else if (!strcasecmp(colon, "filename"))
              filename = data;
          }
        } else if (!strcasecmp(header, "Content-Type")) {
          type = colon;
        }
      }

      part = memmem(after_sub_headers, body + body_len - after_sub_headers, boundary, boundary_len);
      if (!part) {
        log_error(logger_data, "Missing boundary after multipart payload\n");
        return FAILED;
      }
      part[-2] = 0;
      part_len = part - after_sub_headers - 2;
      part[0] = 0;
      part += boundary_len;

      if (filename) {
        uw_Basis_file f = {filename, type, {part_len, after_sub_headers}};

        if (uw_set_file_input(ctx, name, f)) {
          log_error(logger_data, "%s\n", uw_error_message(ctx));
          return FAILED;
        }
      } else if (uw_set_input(ctx, name, after_sub_headers)) {
        log_error(logger_data, "%s\n", uw_error_message(ctx));
        return FAILED;
      }
    }
  }
  else if (!is_fancy) {
    inputs = is_post ? body : query_string;

    if (inputs) {
      char *name, *value;
      int len = strlen(inputs);

      if (len+1 > rc->queryString_size) {
        rc->queryString_size = len+1;
        rc->queryString = realloc(rc->queryString, len+1);
      }
      strcpy(rc->queryString, inputs);

      while (*inputs) {
        name = inputs;
        if ((inputs = strchr(inputs, '&')))
          *inputs++ = 0;
        else
          inputs = strchr(name, 0);

        if ((value = strchr(name, '='))) {
          *value++ = 0;
          if (uw_set_input(ctx, name, value)) {
            log_error(logger_data, "%s\n", uw_error_message(ctx));
            return FAILED;
          }
        }
        else if (uw_set_input(ctx, name, "")) {
          log_error(logger_data, "%s\n", uw_error_message(ctx));
          return FAILED;
        }
      }
    }
  }

  while (1) {
    uw_setQueryString(ctx, rc->queryString);

    if (!had_error) {
      size_t path_len = strlen(path);

      on_success(ctx);

      if (path_len + 1 > rc->path_copy_size) {
        rc->path_copy_size = path_len + 1;
        rc->path_copy = realloc(rc->path_copy, rc->path_copy_size);
      }
      strcpy(rc->path_copy, path);

      uw_set_deadline(ctx, uw_time + uw_time_max);
      fk = uw_begin(ctx, rc->path_copy);
    } else {
      uw_set_deadline(ctx, uw_time + uw_time_max);
      fk = uw_begin_onError(ctx, errmsg);
    }

    if (fk == SUCCESS || fk == RETURN_INDIRECTLY) {
      uw_commit(ctx);
      if (uw_has_error(ctx) && !had_error) {
        log_error(logger_data, "Fatal error: %s\n", uw_error_message(ctx));
        uw_reset_keep_error_message(ctx);
        on_failure(ctx);

        if (uw_get_app(ctx)->on_error) {
          had_error = 1;
          strcpy(errmsg, uw_error_message(ctx));
        } else {
          uw_write_header(ctx, "Content-type: text/html\r\n");
          uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>");
          uw_write(ctx, "Fatal error: ");
          uw_write(ctx, uw_error_message(ctx));
          uw_write(ctx, "\n</body></html>");
        
          try_rollback(ctx, 0, logger_data, log_error);

          return FAILED;
        }
      } else
        return had_error ? FAILED : SERVED;
    } else if (fk == BOUNDED_RETRY) {
      if (retries_left) {
        log_debug(logger_data, "Error triggers bounded retry: %s\n", uw_error_message(ctx));
        --retries_left;
      }
      else {
        log_error(logger_data, "Fatal error (out of retries): %s\n", uw_error_message(ctx));

        if (!had_error && uw_get_app(ctx)->on_error) {
          had_error = 1;
          strcpy(errmsg, uw_error_message(ctx));
        } else {
          uw_reset_keep_error_message(ctx);
          on_failure(ctx);
          uw_write_header(ctx, "Content-type: text/plain\r\n");
          uw_write(ctx, "Fatal error (out of retries): ");
          uw_write(ctx, uw_error_message(ctx));
          uw_write(ctx, "\n");
          
          try_rollback(ctx, 0, logger_data, log_error);

          return FAILED;
        }
      }
    } else if (fk == UNLIMITED_RETRY)
      log_debug(logger_data, "Error triggers unlimited retry: %s\n", uw_error_message(ctx));
    else if (fk == FATAL) {
      log_error(logger_data, "Fatal error: %s\n", uw_error_message(ctx));

      if (uw_get_app(ctx)->on_error && !had_error) {
        had_error = 1;
        strcpy(errmsg, uw_error_message(ctx));
      } else {
        uw_reset_keep_error_message(ctx);
        on_failure(ctx);
        uw_write_header(ctx, "Content-type: text/html\r\n");
        uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>");
        uw_write(ctx, "Fatal error: ");
        uw_write(ctx, uw_error_message(ctx));
        uw_write(ctx, "\n</body></html>");

        try_rollback(ctx, 0, logger_data, log_error);

        return FAILED;
      }
    } else {
      log_error(logger_data, "Unknown uw_handle return code!\n");

      if (uw_get_app(ctx)->on_error && !had_error) {
        had_error = 1;
        strcpy(errmsg, "Unknown uw_handle return code");
      } else {
        uw_reset_keep_request(ctx);
        on_failure(ctx);
        uw_write_header(ctx, "Content-type: text/plain\r\n");
        uw_write(ctx, "Unknown uw_handle return code!\n");

        try_rollback(ctx, 0, logger_data, log_error);

        return FAILED;
      }
    }

    if (try_rollback(ctx, 1, logger_data, log_error))
      return FAILED;

    uw_reset_keep_request(ctx);
  }
}

void *client_pruner(void *data) {
  pruner_data *pd = (pruner_data *)data;
  uw_context ctx = uw_request_new_context(0, pd->app, pd->loggers);

  if (!ctx)
    exit(1);

  while (1) {
    uw_prune_clients(ctx);
    sleep(5);
  }
}