1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "chre/util/nanoapp/wifi.h"
18
19 #ifdef CHRE_IS_NANOAPP_BUILD
20 #include "chre/util/nanoapp/log.h"
21 #else
22 #include "chre/platform/log.h"
23 #endif // CHRE_IS_NANOAPP_BUILD
24
25 #include <cinttypes>
26 #include <cstdio>
27 #include <cstring>
28
29 namespace chre {
30
31 namespace {
32 /** Returns true if `ch` is `[A-Za-z0-9]` or punctuation. */
isgraph(int ch)33 inline bool isgraph(int ch) {
34 return (ch >= '!' && ch <= '~');
35 }
36 } // namespace
37
logChreWifiResult(const chreWifiScanResult & result,bool logSsidOnly)38 void logChreWifiResult(const chreWifiScanResult &result, bool logSsidOnly) {
39 const char *ssidStr = "<non-printable>";
40 char ssidBuffer[kMaxSsidStrLen];
41 if (result.ssidLen == 0) {
42 ssidStr = "<empty>";
43 } else if (parseSsidToStr(ssidBuffer, sizeof(ssidBuffer), result.ssid,
44 result.ssidLen)) {
45 ssidStr = ssidBuffer;
46 }
47
48 LOGI("Found network with SSID: %s", ssidStr);
49 if (!logSsidOnly) {
50 const char *bssidStr = "<non-printable>";
51 char bssidBuffer[kBssidStrLen];
52 if (parseBssidToStr(result.bssid, bssidBuffer, sizeof(bssidBuffer))) {
53 bssidStr = bssidBuffer;
54 }
55
56 LOGI(" age (ms): %" PRIu32, result.ageMs);
57 LOGI(" capability info: %" PRIx16, result.capabilityInfo);
58 LOGI(" bssid: %s", bssidStr);
59 LOGI(" flags: %" PRIx8, result.flags);
60 LOGI(" rssi: %" PRId8 "dBm", result.rssi);
61 LOGI(" band: %s (%" PRIu8 ")", parseChreWifiBand(result.band),
62 result.band);
63 LOGI(" primary channel: %" PRIu32, result.primaryChannel);
64 LOGI(" center frequency primary: %" PRIu32, result.centerFreqPrimary);
65 LOGI(" center frequency secondary: %" PRIu32, result.centerFreqSecondary);
66 LOGI(" channel width: %" PRIu8, result.channelWidth);
67 LOGI(" security mode: %" PRIx8, result.securityMode);
68 }
69 }
70
parseSsidToStr(char * buffer,size_t bufferLen,const uint8_t * ssid,uint8_t ssidLen)71 bool parseSsidToStr(char *buffer, size_t bufferLen, const uint8_t *ssid,
72 uint8_t ssidLen) {
73 // Ensure that there is enough space in the buffer to copy the SSID and
74 // null-terminate it.
75 bool success = (bufferLen >= static_cast<size_t>(ssidLen + 1));
76
77 if (success) {
78 // Verify that the ssid is entirely printable characters and ASCII spaces.
79 for (uint8_t i = 0; i < ssidLen; i++) {
80 if (!isgraph(ssid[i]) && ssid[i] != ' ') {
81 success = false;
82 break;
83 }
84 }
85 }
86
87 if (success) {
88 // Copy the SSID to the buffer and null-terminate.
89 memcpy(buffer, ssid, ssidLen + 1);
90 buffer[ssidLen] = '\0';
91 }
92
93 return success;
94 }
95
parseBssidToStr(const uint8_t bssid[CHRE_WIFI_BSSID_LEN],char * buffer,size_t bufferLen)96 bool parseBssidToStr(const uint8_t bssid[CHRE_WIFI_BSSID_LEN], char *buffer,
97 size_t bufferLen) {
98 const char *kFormat = "%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8
99 ":%02" PRIx8 ":%02" PRIx8;
100
101 bool success = false;
102 if (bufferLen >= kBssidStrLen) {
103 success = true;
104 snprintf(buffer, bufferLen, kFormat, bssid[0], bssid[1], bssid[2], bssid[3],
105 bssid[4], bssid[5]);
106 }
107
108 return success;
109 }
110
parseChreWifiBand(uint8_t band)111 const char *parseChreWifiBand(uint8_t band) {
112 switch (band) {
113 case CHRE_WIFI_BAND_2_4_GHZ:
114 return "2.4GHz";
115 case CHRE_WIFI_BAND_MASK_5_GHZ:
116 return "5GHz";
117 default:
118 return "<invalid>";
119 }
120 }
121
122 } // namespace chre
123