Bug Summary

File:lwan.c
Warning:line 311, column 17
Potential memory leak

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name lwan.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=all -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -fno-plt -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib/clang/10.0.0 -include /home/buildbot/lwan-worker/clang-analyze/build/lwan-build-config.h -D _FILE_OFFSET_BITS=64 -D _TIME_BITS=64 -I /home/buildbot/lwan-worker/clang-analyze/build/src/lib/missing -I /usr/include/luajit-2.0 -I /usr/include/valgrind -I /home/buildbot/lwan-worker/clang-analyze/build/src/lib -I /home/buildbot/lwan-worker/clang-analyze/build -internal-isystem /usr/local/include -internal-isystem /usr/lib/clang/10.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wno-unused-parameter -Wno-free-nonheap-object -std=gnu99 -fdebug-compilation-dir /home/buildbot/lwan-worker/clang-analyze/build/src/lib -ferror-limit 19 -fmessage-length 0 -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -analyzer-output=html -faddrsig -o /home/buildbot/lwan-worker/clang-analyze/CLANG/2020-07-07-152314-1186905-1 -x c /home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c
1/*
2 * lwan - simple web server
3 * Copyright (c) 2012, 2013 Leandro A. F. Pereira <leandro@hardinfo.org>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
18 * USA.
19 */
20
21#define _GNU_SOURCE
22#include <assert.h>
23#include <ctype.h>
24#include <dlfcn.h>
25#include <errno(*__errno_location ()).h>
26#include <fcntl.h>
27#include <libproc.h>
28#include <limits.h>
29#include <signal.h>
30#include <stdlib.h>
31#include <string.h>
32#include <sys/resource.h>
33#include <sys/socket.h>
34#include <sys/types.h>
35#include <unistd.h>
36
37#include "lwan-private.h"
38
39#include "lwan-config.h"
40#include "lwan-http-authorize.h"
41
42#if defined(HAVE_LUA)
43#include "lwan-lua.h"
44#endif
45
46/* See detect_fastest_monotonic_clock() */
47clockid_t monotonic_clock_id = CLOCK_MONOTONIC1;
48
49static const struct lwan_config default_config = {
50 .listener = "localhost:8080",
51 .keep_alive_timeout = 15,
52 .quiet = false0,
53 .reuse_port = false0,
54 .proxy_protocol = false0,
55 .allow_cors = false0,
56 .expires = 1 * ONE_WEEK(((60 * 60) * 24) * 7),
57 .n_threads = 0,
58 .max_post_data_size = 10 * DEFAULT_BUFFER_SIZE4096,
59 .allow_post_temp_file = false0,
60};
61
62LWAN_HANDLER(brew_coffee)static enum lwan_http_status lwan_handler_brew_coffee( struct
lwan_request *, struct lwan_response *, void *); static const
struct lwan_handler_info __attribute__((used, section("lwan_handler"
))) lwan_handler_info_brew_coffee = {.name = "brew_coffee", .
handler = lwan_handler_brew_coffee}; static enum lwan_http_status
lwan_handler_brew_coffee( struct lwan_request *request __attribute__
((unused)), struct lwan_response *response __attribute__((unused
)), void *data __attribute__((unused)))
63{
64 /* Placeholder handler so that __start_lwan_handler and __stop_lwan_handler
65 * symbols will get defined.
66 */
67 return HTTP_I_AM_A_TEAPOT;
68}
69
70__attribute__((no_sanitize_address))
71static void *find_handler(const char *name)
72{
73 const struct lwan_handler_info *handler;
74
75 LWAN_SECTION_FOREACH(lwan_handler, handler)for (handler = ({ extern const typeof(*handler) __start_lwan_handler
[]; __start_lwan_handler; }); handler < ({ extern const typeof
(*handler) __stop_lwan_handler[]; __stop_lwan_handler; }); (handler
)++)
{
76 if (streq(handler->name, name))
77 return handler->handler;
78 }
79
80 return NULL((void*)0);
81}
82
83__attribute__((no_sanitize_address))
84static const struct lwan_module *find_module(const char *name)
85{
86 const struct lwan_module_info *module;
87
88 LWAN_SECTION_FOREACH(lwan_module, module)for (module = ({ extern const typeof(*module) __start_lwan_module
[]; __start_lwan_module; }); module < ({ extern const typeof
(*module) __stop_lwan_module[]; __stop_lwan_module; }); (module
)++)
{
89 if (streq(module->name, name))
90 return module->module;
91 }
92
93 return NULL((void*)0);
94}
95
96static void destroy_urlmap(void *data)
97{
98 struct lwan_url_map *url_map = data;
99
100 if (url_map->module) {
101 const struct lwan_module *module = url_map->module;
102
103 if (module->destroy)
104 module->destroy(url_map->data);
105 } else if (url_map->data && url_map->flags & HANDLER_DATA_IS_HASH_TABLE) {
106 hash_free(url_map->data);
107 }
108
109 free(url_map->authorization.realm);
110 free(url_map->authorization.password_file);
111 free((char *)url_map->prefix);
112 free(url_map);
113}
114
115static struct lwan_url_map *add_url_map(struct lwan_trie *t, const char *prefix,
116 const struct lwan_url_map *map)
117{
118 struct lwan_url_map *copy = malloc(sizeof(*copy));
119
120 if (!copy)
121 lwan_status_critical_perror("Could not copy URL map")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 121, __FUNCTION__, "Could not copy URL map")
;
122
123 memcpy(copy, map, sizeof(*copy));
124
125 copy->prefix = strdup(prefix ? prefix : copy->prefix);
126 if (!copy->prefix)
127 lwan_status_critical_perror("Could not copy URL prefix")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 127, __FUNCTION__, "Could not copy URL prefix")
;
128
129 copy->prefix_len = strlen(copy->prefix);
130 lwan_trie_add(t, copy->prefix, copy);
131
132 return copy;
133}
134
135static bool_Bool can_override_header(const char *name)
136{
137 /* NOTE: Update lwan_prepare_response_header_full() in lwan-response.c
138 * if new headers are added here. */
139
140 if (!strcasecmp(name, "Date"))
141 return false0;
142 if (!strcasecmp(name, "Expires"))
143 return false0;
144 if (!strcasecmp(name, "WWW-Authenticate"))
145 return false0;
146 if (!strcasecmp(name, "Connection"))
147 return false0;
148 if (!strcasecmp(name, "Content-Type"))
149 return false0;
150 if (!strcasecmp(name, "Transfer-Encoding"))
151 return false0;
152 if (!strncasecmp(name, "Access-Control-Allow-",
153 sizeof("Access-Control-Allow-") - 1))
154 return false0;
155
156 return true1;
157}
158
159static void build_response_headers(struct lwan *l,
160 const struct lwan_key_value *kv)
161{
162 bool_Bool set_server = false0;
163
164 assert(l)((void) sizeof ((l) ? 1 : 0), __extension__ ({ if (l) ; else __assert_fail
("l", "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 164, __extension__ __PRETTY_FUNCTION__); }))
;
165
166 lwan_strbuf_init(&l->headers);
167
168 for (; kv && kv->key; kv++) {
169 if (!can_override_header(kv->key)) {
170 lwan_status_warning("Cannot override header '%s'", kv->key)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 170, __FUNCTION__, "Cannot override header '%s'", kv->key
)
;
171 } else {
172 if (!strcasecmp(kv->key, "Server"))
173 set_server = true1;
174
175 lwan_strbuf_append_printf(&l->headers, "\r\n%s: %s", kv->key,
176 kv->value);
177 }
178 }
179
180 if (!set_server)
181 lwan_strbuf_append_strz(&l->headers, "\r\nServer: lwan");
182
183 lwan_strbuf_append_strz(&l->headers, "\r\n\r\n");
184}
185
186static void parse_global_headers(struct config *c,
187 struct lwan *lwan)
188{
189 struct lwan_key_value_array hdrs;
190 const struct config_line *l;
191 struct lwan_key_value *kv;
192
193 lwan_key_value_array_init(&hdrs);
194
195 while ((l = config_read_line(c))) {
196 switch (l->type) {
197 case CONFIG_LINE_TYPE_SECTION:
198 config_error(
199 c, "No sections are supported under the 'headers' section");
200 goto cleanup;
201
202 case CONFIG_LINE_TYPE_LINE:
203 kv = lwan_key_value_array_append(&hdrs);
204 if (!kv) {
205 lwan_status_critical_perror(lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 206, __FUNCTION__, "Could not allocate memory for custom response header"
)
206 "Could not allocate memory for custom response header")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 206, __FUNCTION__, "Could not allocate memory for custom response header"
)
;
207 }
208
209 kv->key = strdup(l->key);
210 if (!kv->key) {
211 lwan_status_critical_perror(lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 212, __FUNCTION__, "Could not allocate memory for custom response header"
)
212 "Could not allocate memory for custom response header")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 212, __FUNCTION__, "Could not allocate memory for custom response header"
)
;
213 }
214
215 kv->value = strdup(l->value);
216 if (!kv->value) {
217 lwan_status_critical_perror(lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 218, __FUNCTION__, "Could not allocate memory for custom response header"
)
218 "Could not allocate memory for custom response header")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 218, __FUNCTION__, "Could not allocate memory for custom response header"
)
;
219 }
220 break;
221
222 case CONFIG_LINE_TYPE_SECTION_END:
223 kv = lwan_key_value_array_append(&hdrs);
224 if (!kv) {
225 lwan_status_critical_perror(lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 226, __FUNCTION__, "Could not allocate memory for custom response header"
)
226 "Could not allocate memory for custom response header")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 226, __FUNCTION__, "Could not allocate memory for custom response header"
)
;
227 }
228
229 kv->key = NULL((void*)0);
230 kv->value = NULL((void*)0);
231
232 build_response_headers(lwan, lwan_key_value_array_get_array(&hdrs));
233 goto cleanup;
234 }
235 }
236
237 config_error(c, "EOF while looking for end of 'headers' section");
238
239cleanup:
240 LWAN_ARRAY_FOREACH (&hdrs, kv)for (kv = (&hdrs)->base.base; kv < ((typeof(kv))(&
hdrs)->base.base + (&hdrs)->base.elements); kv++)
{
241 free(kv->key);
242 free(kv->value);
243 }
244 lwan_key_value_array_reset(&hdrs);
245}
246
247static void parse_listener_prefix_authorization(struct config *c,
248 const struct config_line *l,
249 struct lwan_url_map *url_map)
250{
251 if (!streq(l->value, "basic")) {
252 config_error(c, "Only basic authorization supported");
253 return;
254 }
255
256 memset(&url_map->authorization, 0, sizeof(url_map->authorization));
257
258 while ((l = config_read_line(c))) {
259 switch (l->type) {
260 case CONFIG_LINE_TYPE_LINE:
261 if (streq(l->key, "realm")) {
262 free(url_map->authorization.realm);
263 url_map->authorization.realm = strdup(l->value);
264 } else if (streq(l->key, "password_file")) {
265 free(url_map->authorization.password_file);
266 url_map->authorization.password_file = realpath(l->value, NULL((void*)0));
267 if (!url_map->authorization.password_file)
268 config_error(c, "Could not determine full path for password file: %s", l->value);
269 }
270 break;
271
272 case CONFIG_LINE_TYPE_SECTION:
273 config_error(c, "Unexpected section: %s", l->key);
274 goto error;
275
276 case CONFIG_LINE_TYPE_SECTION_END:
277 if (!url_map->authorization.realm)
278 url_map->authorization.realm = strdup("Lwan");
279 if (!url_map->authorization.password_file)
280 url_map->authorization.password_file = strdup("htpasswd");
281
282 url_map->flags |= HANDLER_MUST_AUTHORIZE;
283 return;
284 }
285 }
286
287 config_error(c, "Could not find end of authorization section");
288
289error:
290 free(url_map->authorization.realm);
291 free(url_map->authorization.password_file);
292}
293
294static void parse_listener_prefix(struct config *c,
295 const struct config_line *l,
296 struct lwan *lwan,
297 const struct lwan_module *module,
298 void *handler)
299{
300 struct lwan_url_map url_map = {};
301 struct hash *hash = hash_str_new(free, free);
302 char *prefix = strdupa(l->value)(__extension__ ({ const char *__old = (l->value); size_t __len
= strlen (__old) + 1; char *__new = (char *) __builtin_alloca
(__len); (char *) memcpy (__new, __old, __len); }))
;
303 struct config *isolated;
304
305 isolated = config_isolate_section(c, l);
306 if (!isolated) {
21
Assuming 'isolated' is non-null
22
Taking false branch
307 config_error(c, "Could not isolate configuration file");
308 goto out;
309 }
310
311 while ((l = config_read_line(c))) {
23
Loop condition is true. Entering loop body
27
Potential memory leak
312 switch (l->type) {
24
Control jumps to 'case CONFIG_LINE_TYPE_LINE:' at line 313
313 case CONFIG_LINE_TYPE_LINE:
314 hash_add(hash, strdup(l->key), strdup(l->value));
25
Memory is allocated
315 break;
26
Execution continues on line 311
316
317 case CONFIG_LINE_TYPE_SECTION:
318 if (streq(l->key, "authorization")) {
319 parse_listener_prefix_authorization(c, l, &url_map);
320 } else if (!config_skip_section(c, l)) {
321 config_error(c, "Could not skip section");
322 goto out;
323 }
324 break;
325
326 case CONFIG_LINE_TYPE_SECTION_END:
327 goto add_map;
328 }
329 }
330
331 config_error(c, "Expecting section end while parsing prefix");
332 goto out;
333
334add_map:
335 assert((handler && !module) || (!handler && module))((void) sizeof (((handler && !module) || (!handler &&
module)) ? 1 : 0), __extension__ ({ if ((handler && !
module) || (!handler && module)) ; else __assert_fail
("(handler && !module) || (!handler && module)"
, "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 335, __extension__ __PRETTY_FUNCTION__); }))
;
336
337 if (handler) {
338 url_map.handler = handler;
339 url_map.flags |= HANDLER_PARSE_MASK | HANDLER_DATA_IS_HASH_TABLE;
340 url_map.data = hash;
341 url_map.module = NULL((void*)0);
342
343 hash = NULL((void*)0);
344 } else if (module->create_from_hash && module->handle_request) {
345 url_map.data = module->create_from_hash(prefix, hash);
346 if (!url_map.data) {
347 config_error(c, "Could not create module instance");
348 goto out;
349 }
350
351 if (module->parse_conf && !module->parse_conf(url_map.data, isolated)) {
352 const char *msg = config_last_error(isolated);
353
354 config_error(c, "Error from module: %s", msg ? msg : "Unknown");
355 goto out;
356 }
357
358 url_map.handler = module->handle_request;
359 url_map.flags |= module->flags;
360 url_map.module = module;
361 } else if (UNLIKELY(!module->create_from_hash)__builtin_expect(((!module->create_from_hash)), (0))) {
362 config_error(c, "Module isn't prepared to load settings from a file; "
363 "create_from_hash() method isn't present");
364 goto out;
365 } else if (UNLIKELY(!module->handle_request)__builtin_expect(((!module->handle_request)), (0))) {
366 config_error(c, "Module does not have handle_request() method");
367 goto out;
368 }
369
370 add_url_map(&lwan->url_map_trie, prefix, &url_map);
371
372out:
373 hash_free(hash);
374 config_close(isolated);
375}
376
377void lwan_set_url_map(struct lwan *l, const struct lwan_url_map *map)
378{
379 lwan_trie_destroy(&l->url_map_trie);
380 if (UNLIKELY(!lwan_trie_init(&l->url_map_trie, destroy_urlmap))__builtin_expect(((!lwan_trie_init(&l->url_map_trie, destroy_urlmap
))), (0))
)
381 lwan_status_critical_perror("Could not initialize trie")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 381, __FUNCTION__, "Could not initialize trie")
;
382
383 for (; map->prefix; map++) {
384 struct lwan_url_map *copy = add_url_map(&l->url_map_trie, NULL((void*)0), map);
385
386 if (copy->module && copy->module->create) {
387 copy->data = copy->module->create (map->prefix, copy->args);
388 copy->flags = copy->module->flags;
389 copy->handler = copy->module->handle_request;
390 } else {
391 copy->flags = HANDLER_PARSE_MASK;
392 }
393 }
394}
395
396static void parse_listener(struct config *c,
397 const struct config_line *l,
398 struct lwan *lwan)
399{
400 free(lwan->config.listener);
401 lwan->config.listener = strdup(l->value);
402
403 while ((l = config_read_line(c))) {
14
Loop condition is true. Entering loop body
404 switch (l->type) {
15
Control jumps to 'case CONFIG_LINE_TYPE_SECTION:' at line 408
405 case CONFIG_LINE_TYPE_LINE:
406 config_error(c, "Expecting prefix section");
407 return;
408 case CONFIG_LINE_TYPE_SECTION:
409 if (l->key[0] == '&') {
16
Assuming the condition is false
17
Taking false branch
410 void *handler = find_handler(l->key + 1);
411 if (handler) {
412 parse_listener_prefix(c, l, lwan, NULL((void*)0), handler);
413 continue;
414 }
415
416 config_error(c, "Could not find handler name: %s", l->key + 1);
417 return;
418 }
419
420 const struct lwan_module *module = find_module(l->key);
421 if (module) {
18
Assuming 'module' is non-null
19
Taking true branch
422 parse_listener_prefix(c, l, lwan, module, NULL((void*)0));
20
Calling 'parse_listener_prefix'
423 continue;
424 }
425
426 config_error(c, "Invalid section or module not found: %s", l->key);
427 return;
428 case CONFIG_LINE_TYPE_SECTION_END:
429 return;
430 }
431 }
432
433 config_error(c, "Expecting section end while parsing listener");
434}
435
436const char *lwan_get_config_path(char *path_buf, size_t path_buf_len)
437{
438 char buffer[PATH_MAX4096];
439
440 if (proc_pidpath(getpid(), buffer, sizeof(buffer)) < 0)
441 goto out;
442
443 char *path = strrchr(buffer, '/');
444 if (!path)
445 goto out;
446 int ret = snprintf(path_buf, path_buf_len, "%s.conf", path + 1);
447 if (ret < 0 || ret >= (int)path_buf_len)
448 goto out;
449
450 return path_buf;
451
452out:
453 return "lwan.conf";
454}
455
456static bool_Bool setup_from_config(struct lwan *lwan, const char *path)
457{
458 const struct config_line *line;
459 struct config *conf;
460 bool_Bool has_listener = false0;
461 char path_buf[PATH_MAX4096];
462
463 if (!path
3.1
'path' is null
)
4
Taking true branch
464 path = lwan_get_config_path(path_buf, sizeof(path_buf));
465 lwan_status_info("Loading configuration file: %s", path)lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 465, __FUNCTION__, "Loading configuration file: %s", path)
;
466
467 conf = config_open(path);
468 if (!conf)
5
Assuming 'conf' is non-null
6
Taking false branch
469 return false0;
470
471 if (!lwan_trie_init(&lwan->url_map_trie, destroy_urlmap))
7
Assuming the condition is false
8
Taking false branch
472 return false0;
473
474 while ((line = config_read_line(conf))) {
9
Loop condition is true. Entering loop body
475 switch (line->type) {
10
Control jumps to 'case CONFIG_LINE_TYPE_SECTION:' at line 521
476 case CONFIG_LINE_TYPE_LINE:
477 if (streq(line->key, "keep_alive_timeout")) {
478 lwan->config.keep_alive_timeout = (unsigned int)parse_long(
479 line->value, default_config.keep_alive_timeout);
480 } else if (streq(line->key, "quiet")) {
481 lwan->config.quiet =
482 parse_bool(line->value, default_config.quiet);
483 } else if (streq(line->key, "reuse_port")) {
484 lwan->config.reuse_port =
485 parse_bool(line->value, default_config.reuse_port);
486 } else if (streq(line->key, "proxy_protocol")) {
487 lwan->config.proxy_protocol =
488 parse_bool(line->value, default_config.proxy_protocol);
489 } else if (streq(line->key, "allow_cors")) {
490 lwan->config.allow_cors =
491 parse_bool(line->value, default_config.allow_cors);
492 } else if (streq(line->key, "expires")) {
493 lwan->config.expires =
494 parse_time_period(line->value, default_config.expires);
495 } else if (streq(line->key, "error_template")) {
496 free(lwan->config.error_template);
497 lwan->config.error_template = strdup(line->value);
498 } else if (streq(line->key, "threads")) {
499 long n_threads =
500 parse_long(line->value, default_config.n_threads);
501 if (n_threads < 0)
502 config_error(conf, "Invalid number of threads: %ld",
503 n_threads);
504 lwan->config.n_threads = (unsigned int)n_threads;
505 } else if (streq(line->key, "max_post_data_size")) {
506 long max_post_data_size = parse_long(
507 line->value, (long)default_config.max_post_data_size);
508 if (max_post_data_size < 0)
509 config_error(conf, "Negative maximum post data size");
510 else if (max_post_data_size > 128 * (1 << 20))
511 config_error(conf,
512 "Maximum post data can't be over 128MiB");
513 lwan->config.max_post_data_size = (size_t)max_post_data_size;
514 } else if (streq(line->key, "allow_temp_files")) {
515 lwan->config.allow_post_temp_file =
516 !!strstr(line->value, "post");
517 } else {
518 config_error(conf, "Unknown config key: %s", line->key);
519 }
520 break;
521 case CONFIG_LINE_TYPE_SECTION:
522 if (streq(line->key, "listener")) {
11
Taking true branch
523 if (!has_listener
11.1
'has_listener' is false
) {
12
Taking true branch
524 parse_listener(conf, line, lwan);
13
Calling 'parse_listener'
525 has_listener = true1;
526 } else {
527 config_error(conf, "Only one listener supported");
528 }
529 } else if (streq(line->key, "straitjacket")) {
530 lwan_straitjacket_enforce_from_config(conf);
531 } else if (streq(line->key, "headers")) {
532 parse_global_headers(conf, lwan);
533 } else {
534 config_error(conf, "Unknown section type: %s", line->key);
535 }
536 break;
537 case CONFIG_LINE_TYPE_SECTION_END:
538 config_error(conf, "Unexpected section end");
539 }
540 }
541
542 if (config_last_error(conf)) {
543 lwan_status_critical("Error on config file \"%s\", line %d: %s", path,lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 544, __FUNCTION__, "Error on config file \"%s\", line %d: %s"
, path, config_cur_line(conf), config_last_error(conf))
544 config_cur_line(conf), config_last_error(conf))lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 544, __FUNCTION__, "Error on config file \"%s\", line %d: %s"
, path, config_cur_line(conf), config_last_error(conf))
;
545 }
546
547 config_close(conf);
548
549 return true1;
550}
551
552static void try_setup_from_config(struct lwan *l,
553 const struct lwan_config *config)
554{
555 if (!setup_from_config(l, config->config_file_path)) {
3
Calling 'setup_from_config'
556 if (config->config_file_path) {
557 lwan_status_critical("Could not read config file: %s",lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 558, __FUNCTION__, "Could not read config file: %s", config
->config_file_path)
558 config->config_file_path)lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 558, __FUNCTION__, "Could not read config file: %s", config
->config_file_path)
;
559 }
560 }
561
562 lwan_status_init(l); /* `quiet` key might have changed value. */
563
564 l->config.request_flags =
565 (l->config.proxy_protocol ? REQUEST_ALLOW_PROXY_REQS : 0) |
566 (l->config.allow_cors ? REQUEST_ALLOW_CORS : 0);
567}
568
569static rlim_t setup_open_file_count_limits(void)
570{
571 struct rlimit r;
572
573 if (getrlimit(RLIMIT_NOFILERLIMIT_NOFILE, &r) < 0) {
574 lwan_status_perror("Could not obtain maximum number of file "lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 576, __FUNCTION__, "Could not obtain maximum number of file "
"descriptors. Assuming %d", 256)
575 "descriptors. Assuming %d",lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 576, __FUNCTION__, "Could not obtain maximum number of file "
"descriptors. Assuming %d", 256)
576 OPEN_MAX)lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 576, __FUNCTION__, "Could not obtain maximum number of file "
"descriptors. Assuming %d", 256)
;
577 return OPEN_MAX256;
578 }
579
580 if (r.rlim_max != r.rlim_cur) {
581 const rlim_t current = r.rlim_cur;
582
583 if (r.rlim_max == RLIM_INFINITY0xffffffffffffffffuLL && r.rlim_cur < OPEN_MAX256) {
584 r.rlim_cur = OPEN_MAX256;
585 } else if (r.rlim_cur < r.rlim_max) {
586 r.rlim_cur = r.rlim_max;
587 } else {
588 /* Shouldn't happen, so just return the current value. */
589 goto out;
590 }
591
592 if (setrlimit(RLIMIT_NOFILERLIMIT_NOFILE, &r) < 0) {
593 lwan_status_perror("Could not raise maximum number of file "lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 595, __FUNCTION__, "Could not raise maximum number of file "
"descriptors to %" "l" "u" ". Leaving at " "%" "l" "u", r.rlim_max
, current)
594 "descriptors to %" PRIu64 ". Leaving at "lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 595, __FUNCTION__, "Could not raise maximum number of file "
"descriptors to %" "l" "u" ". Leaving at " "%" "l" "u", r.rlim_max
, current)
595 "%" PRIu64, r.rlim_max, current)lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 595, __FUNCTION__, "Could not raise maximum number of file "
"descriptors to %" "l" "u" ". Leaving at " "%" "l" "u", r.rlim_max
, current)
;
596 r.rlim_cur = current;
597 }
598 }
599
600out:
601 return r.rlim_cur;
602}
603
604static void allocate_connections(struct lwan *l, size_t max_open_files)
605{
606 const size_t sz = max_open_files * sizeof(struct lwan_connection);
607
608 l->conns = lwan_aligned_alloc(sz, 64);
609 if (UNLIKELY(!l->conns)__builtin_expect(((!l->conns)), (0)))
610 lwan_status_critical_perror("lwan_alloc_aligned")lwan_status_critical_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 610, __FUNCTION__, "lwan_alloc_aligned")
;
611
612 memset(l->conns, 0, sz);
613}
614
615static unsigned int get_number_of_cpus(void)
616{
617 long n_online_cpus = sysconf(_SC_NPROCESSORS_ONLN_SC_NPROCESSORS_ONLN);
618
619 if (UNLIKELY(n_online_cpus < 0)__builtin_expect(((n_online_cpus < 0)), (0))) {
620 lwan_status_warning(lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 621, __FUNCTION__, "Could not get number of online CPUs, assuming 1 CPU"
)
621 "Could not get number of online CPUs, assuming 1 CPU")lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 621, __FUNCTION__, "Could not get number of online CPUs, assuming 1 CPU"
)
;
622 return 1;
623 }
624
625 return (unsigned int)n_online_cpus;
626}
627
628void lwan_init(struct lwan *l) { lwan_init_with_config(l, &default_config); }
1
Calling 'lwan_init_with_config'
629
630const struct lwan_config *lwan_get_default_config(void)
631{
632 return &default_config;
633}
634
635static char *dup_or_null(const char *s)
636{
637 return s ? strdup(s) : NULL((void*)0);
638}
639
640void lwan_init_with_config(struct lwan *l, const struct lwan_config *config)
641{
642 /* Load defaults */
643 memset(l, 0, sizeof(*l));
644 memcpy(&l->config, config, sizeof(*config));
645 l->config.listener = dup_or_null(l->config.listener);
646 l->config.config_file_path = dup_or_null(l->config.config_file_path);
647
648 /* Initialize status first, as it is used by other things during
649 * their initialization. */
650 lwan_status_init(l);
651
652 /* These will only print debugging messages. Debug messages are always
653 * printed if we're on a debug build, so the quiet setting will be
654 * respected. */
655 lwan_job_thread_init();
656 lwan_tables_init();
657
658 try_setup_from_config(l, config);
2
Calling 'try_setup_from_config'
659
660 if (!lwan_strbuf_get_length(&l->headers))
661 build_response_headers(l, config->global_headers);
662
663 lwan_response_init(l);
664
665 /* Continue initialization as normal. */
666 lwan_status_debug("Initializing lwan web server")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 666, __FUNCTION__, "Initializing lwan web server")
;
667
668 l->n_cpus = get_number_of_cpus();
669 if (!l->config.n_threads) {
670 l->thread.count = l->n_cpus;
671 if (l->thread.count == 1)
672 l->thread.count = 2;
673 } else if (l->config.n_threads > 3 * l->n_cpus) {
674 l->thread.count = l->n_cpus * 3;
675
676 lwan_status_warning("%d threads requested, but only %d online CPUs; "lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 678, __FUNCTION__, "%d threads requested, but only %d online CPUs; "
"capping to %d threads", l->config.n_threads, l->n_cpus
, 3 * l->n_cpus)
677 "capping to %d threads",lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 678, __FUNCTION__, "%d threads requested, but only %d online CPUs; "
"capping to %d threads", l->config.n_threads, l->n_cpus
, 3 * l->n_cpus)
678 l->config.n_threads, l->n_cpus, 3 * l->n_cpus)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 678, __FUNCTION__, "%d threads requested, but only %d online CPUs; "
"capping to %d threads", l->config.n_threads, l->n_cpus
, 3 * l->n_cpus)
;
679 } else if (l->config.n_threads > 255) {
680 l->thread.count = 256;
681
682 lwan_status_warning("%d threads requested, but max 256 supported",lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 683, __FUNCTION__, "%d threads requested, but max 256 supported"
, l->config.n_threads)
683 l->config.n_threads)lwan_status_warning_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 683, __FUNCTION__, "%d threads requested, but max 256 supported"
, l->config.n_threads)
;
684 } else {
685 l->thread.count = l->config.n_threads;
686 }
687
688 rlim_t max_open_files = setup_open_file_count_limits();
689 allocate_connections(l, (size_t)max_open_files);
690
691 l->thread.max_fd = (unsigned)max_open_files / (unsigned)l->thread.count;
692 lwan_status_info("Using %d threads, maximum %d sockets per thread",lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 693, __FUNCTION__, "Using %d threads, maximum %d sockets per thread"
, l->thread.count, l->thread.max_fd)
693 l->thread.count, l->thread.max_fd)lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 693, __FUNCTION__, "Using %d threads, maximum %d sockets per thread"
, l->thread.count, l->thread.max_fd)
;
694
695 signal(SIGPIPE13, SIG_IGN((__sighandler_t) 1));
696
697 lwan_readahead_init();
698 lwan_thread_init(l);
699 lwan_socket_init(l);
700 lwan_http_authorize_init();
701}
702
703void lwan_shutdown(struct lwan *l)
704{
705 lwan_status_info("Shutting down")lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 705, __FUNCTION__, "Shutting down")
;
706
707 free(l->config.listener);
708 free(l->config.error_template);
709 free(l->config.config_file_path);
710
711 lwan_job_thread_shutdown();
712 lwan_thread_shutdown(l);
713
714 lwan_status_debug("Shutting down URL handlers")lwan_status_debug_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 714, __FUNCTION__, "Shutting down URL handlers")
;
715 lwan_trie_destroy(&l->url_map_trie);
716
717 lwan_strbuf_free(&l->headers);
718 free(l->conns);
719
720 lwan_response_shutdown(l);
721 lwan_tables_shutdown();
722 lwan_status_shutdown(l);
723 lwan_http_authorize_shutdown();
724 lwan_readahead_shutdown();
725}
726
727static ALWAYS_INLINEinline __attribute__((always_inline)) int schedule_client(struct lwan *l, int fd)
728{
729 struct lwan_thread *thread = l->conns[fd].thread;
730
731 lwan_thread_add_client(thread, fd);
732
733 return (int)(thread - l->thread.threads);
734}
735
736static volatile sig_atomic_t main_socket = -1;
737
738static_assert(sizeof(main_socket) >= sizeof(int),extern int (*__Static_assert_function (void)) [!!sizeof (struct
{ int __error_if_negative: (sizeof(main_socket) >= sizeof
(int)) ? 2 : -1; })]
739 "size of sig_atomic_t > size of int")extern int (*__Static_assert_function (void)) [!!sizeof (struct
{ int __error_if_negative: (sizeof(main_socket) >= sizeof
(int)) ? 2 : -1; })]
;
740
741static void sigint_handler(int signal_number __attribute__((unused)))
742{
743 if (main_socket < 0)
744 return;
745
746 shutdown((int)main_socket, SHUT_RDWRSHUT_RDWR);
747 close((int)main_socket);
748
749 main_socket = -1;
750}
751
752enum herd_accept { HERD_MORE = 0, HERD_GONE = -1, HERD_SHUTDOWN = 1 };
753
754struct core_bitmap {
755 uint64_t bitmap[4];
756};
757
758static ALWAYS_INLINEinline __attribute__((always_inline)) enum herd_accept
759accept_one(struct lwan *l, struct core_bitmap *cores)
760{
761 int fd = accept4((int)main_socket, NULL((void*)0), NULL((void*)0), SOCK_NONBLOCKSOCK_NONBLOCK | SOCK_CLOEXECSOCK_CLOEXEC);
762
763 if (LIKELY(fd >= 0)__builtin_expect((!!(fd >= 0)), (1))) {
764 int core = schedule_client(l, fd);
765
766 cores->bitmap[core / 64] |= UINT64_C(1)1UL<<(core % 64);
767
768 return HERD_MORE;
769 }
770
771 switch (errno(*__errno_location ())) {
772 case EAGAIN11:
773 return HERD_GONE;
774
775 case EBADF9:
776 case ECONNABORTED103:
777 case EINVAL22:
778 if (main_socket < 0) {
779 lwan_status_info("Signal 2 (Interrupt) received")lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 779, __FUNCTION__, "Signal 2 (Interrupt) received")
;
780 } else {
781 lwan_status_info("Main socket closed for unknown reasons")lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 781, __FUNCTION__, "Main socket closed for unknown reasons"
)
;
782 }
783 return HERD_SHUTDOWN;
784
785 default:
786 lwan_status_perror("accept")lwan_status_perror_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 786, __FUNCTION__, "accept")
;
787 return HERD_MORE;
788 }
789}
790
791void lwan_main_loop(struct lwan *l)
792{
793 struct core_bitmap cores = {};
794
795 assert(main_socket == -1)((void) sizeof ((main_socket == -1) ? 1 : 0), __extension__ (
{ if (main_socket == -1) ; else __assert_fail ("main_socket == -1"
, "/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 795, __extension__ __PRETTY_FUNCTION__); }))
;
796 main_socket = l->main_socket;
797
798 if (signal(SIGINT2, sigint_handler) == SIG_ERR((__sighandler_t) -1))
799 lwan_status_critical("Could not set signal handler")lwan_status_critical_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 799, __FUNCTION__, "Could not set signal handler")
;
800
801 lwan_status_info("Ready to serve")lwan_status_info_debug("/home/buildbot/lwan-worker/clang-analyze/build/src/lib/lwan.c"
, 801, __FUNCTION__, "Ready to serve")
;
802
803 while (true1) {
804 enum herd_accept ha;
805
806 fcntl(l->main_socket, F_SETFL4, 0);
807 ha = accept_one(l, &cores);
808 if (ha == HERD_MORE) {
809 fcntl(l->main_socket, F_SETFL4, O_NONBLOCK04000);
810
811 do {
812 ha = accept_one(l, &cores);
813 } while (ha == HERD_MORE);
814 }
815
816 if (UNLIKELY(ha > HERD_MORE)__builtin_expect(((ha > HERD_MORE)), (0)))
817 break;
818
819 for (size_t i = 0; i < N_ELEMENTS(cores.bitmap)((!sizeof(char[1 - 2 * __builtin_types_compatible_p( __typeof__
(cores.bitmap), __typeof__(&(cores.bitmap)[0]))])) | sizeof
(cores.bitmap) / sizeof(cores.bitmap[0]))
; i++) {
820 for (uint64_t c = cores.bitmap[i]; c; c ^= c & -c) {
821 size_t core = (size_t)__builtin_ctzl(c);
822 lwan_thread_nudge(&l->thread.threads[i * 64 + core]);
823 }
824 }
825 cores = (struct core_bitmap){};
826 }
827}
828
829#ifdef CLOCK_MONOTONIC_COARSE6
830__attribute__((constructor)) static void detect_fastest_monotonic_clock(void)
831{
832 struct timespec ts;
833
834 if (!clock_gettime(CLOCK_MONOTONIC_COARSE6, &ts))
835 monotonic_clock_id = CLOCK_MONOTONIC_COARSE6;
836}
837#endif
838
839void lwan_set_thread_name(const char *name)
840{
841 char thread_name[16];
842 char process_name[PATH_MAX4096];
843 char *tmp;
844 int ret;
845
846 if (proc_pidpath(getpid(), process_name, sizeof(process_name)) < 0)
847 return;
848
849 tmp = strrchr(process_name, '/');
850 if (!tmp)
851 return;
852
853 ret = snprintf(thread_name, sizeof(thread_name), "%s %s", tmp + 1, name);
854 if (ret < 0)
855 return;
856
857 pthread_set_name_np(pthread_self(), thread_name);
858}