1 /*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #include "private-lib-core.h"
26
27 /*
28 * Normally you don't want this, use lws_sul instead inside the event loop.
29 * But sometimes for drivers it makes sense, so there's an internal-only
30 * crossplatform api for it.
31 */
32
33 void
lws_msleep(unsigned int ms)34 lws_msleep(unsigned int ms)
35 {
36 vTaskDelay(portTICK_PERIOD_MS > ms ? 1 : ms / portTICK_PERIOD_MS);
37 }
38
39 lws_usec_t
lws_now_usecs(void)40 lws_now_usecs(void)
41 {
42 struct timeval tv;
43 gettimeofday(&tv, NULL);
44 return ((unsigned long long)tv.tv_sec * 1000000LL) + tv.tv_usec;
45 }
46
47 size_t
lws_get_random(struct lws_context * context,void * buf,size_t len)48 lws_get_random(struct lws_context *context, void *buf, size_t len)
49 {
50 #if defined(LWS_WITH_ESP32)
51 uint8_t *pb = buf;
52
53 while (len) {
54 uint32_t r = esp_random();
55 uint8_t *p = (uint8_t *)&r;
56 int b = 4;
57
58 if (len < (size_t)b)
59 b = len;
60
61 len -= b;
62
63 while (b--)
64 *pb++ = p[b];
65 }
66
67 return pb - (uint8_t *)buf;
68 #else
69 #if defined(LWS_WITH_MBEDTLS)
70 int n;
71
72 n = mbedtls_ctr_drbg_random(&context->mcdc, buf, len);
73 if (!n)
74 return len;
75
76 /* failed */
77
78 lwsl_err("%s: mbedtls_ctr_drbg_random returned 0x%x\n", __func__, n);
79 #endif
80 return 0;
81 #endif
82 }
83
84
lwsl_emit_syslog(int level,const char * line)85 void lwsl_emit_syslog(int level, const char *line)
86 {
87 lwsl_emit_stderr(level, line);
88 }
89
90 int
lws_plat_drop_app_privileges(struct lws_context * context,int actually_init)91 lws_plat_drop_app_privileges(struct lws_context *context, int actually_init)
92 {
93 return 0;
94 }
95
96 int
lws_plat_recommended_rsa_bits(void)97 lws_plat_recommended_rsa_bits(void)
98 {
99 /*
100 * 2048-bit key generation takes up to a minute on ESP32, 4096
101 * is like 15 minutes +
102 */
103 return 2048;
104 }
105