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 <arpa/inet.h>
18 #include <ifaddrs.h>
19 #include <stdio.h>
20 #include <string.h>
21
22 #include <memory>
23 #include <sstream>
24 #include <string>
25
26 #include <glog/logging.h>
27
28 #include "common/libs/constants/ril.h"
29 #include "host/commands/launch/ril_config.h"
30
31 namespace {
32
number_of_ones(unsigned long val)33 int number_of_ones(unsigned long val) {
34 int ret = 0;
35 while (val) {
36 ret += val % 2;
37 val >>= 1;
38 }
39 return ret;
40 }
41
42 class NetConfig {
43 public:
44 uint32_t ril_prefixlen = -1;
45 std::string ril_ipaddr;
46 std::string ril_gateway;
47 std::string ril_dns = "8.8.8.8";
48 std::string ril_broadcast;
49
ObtainConfig(const std::string & interface)50 bool ObtainConfig(const std::string& interface) {
51 bool ret = ParseIntefaceAttributes(interface);
52 LOG(INFO) << "Network config:";
53 LOG(INFO) << "ipaddr = " << ril_ipaddr;
54 LOG(INFO) << "gateway = " << ril_gateway;
55 LOG(INFO) << "dns = " << ril_dns;
56 LOG(INFO) << "broadcast = " << ril_broadcast;
57 LOG(INFO) << "prefix length = " << ril_prefixlen;
58 return ret;
59 }
60
61 private:
ParseIntefaceAttributes(struct ifaddrs * ifa)62 bool ParseIntefaceAttributes(struct ifaddrs* ifa) {
63 // if (ifa->ifa_addr->sa_family != AF_INET) {
64 // LOG(ERROR) << "The " << ifa->ifa_name << " interface is not IPv4";
65 // return false;
66 // }
67 struct sockaddr_in* sa;
68 char* addr_str;
69
70 // Gateway
71 sa = reinterpret_cast<sockaddr_in*>(ifa->ifa_addr);
72 addr_str = inet_ntoa(sa->sin_addr);
73 this->ril_gateway = strtok(addr_str, "\n");
74 auto gateway_s_addr = ntohl(sa->sin_addr.s_addr);
75
76 // Broadcast
77 sa = reinterpret_cast<sockaddr_in*>(ifa->ifa_broadaddr);
78 addr_str = inet_ntoa(sa->sin_addr);
79 this->ril_broadcast = strtok(addr_str, "\n");
80 auto broadcast_s_addr = ntohl(sa->sin_addr.s_addr);
81
82 // Netmask
83 sa = reinterpret_cast<sockaddr_in*>(ifa->ifa_netmask);
84 this->ril_prefixlen = number_of_ones(sa->sin_addr.s_addr);
85 auto netmask_s_addr = ntohl(sa->sin_addr.s_addr);
86
87 // Address (Find an address in the network different than the network, the
88 // gateway and the broadcast)
89 auto network = gateway_s_addr & netmask_s_addr;
90 auto s_addr = network + 1;
91 // s_addr & ~netmask_s_addr is zero when s_addr wraps around the network
92 while (s_addr & ~netmask_s_addr) {
93 if (s_addr != gateway_s_addr && s_addr != broadcast_s_addr) {
94 break;
95 }
96 ++s_addr;
97 }
98 if (s_addr == network) {
99 LOG(ERROR) << "No available address found in interface " << ifa->ifa_name;
100 return false;
101 }
102 struct in_addr addr;
103 addr.s_addr = htonl(s_addr);
104 addr_str = inet_ntoa(addr);
105 this->ril_ipaddr = strtok(addr_str, "\n");
106 return true;
107 }
108
ParseIntefaceAttributes(const std::string & interface)109 bool ParseIntefaceAttributes(const std::string& interface) {
110 struct ifaddrs *ifa_list{}, *ifa{};
111 bool ret = false;
112 getifaddrs(&ifa_list);
113 for (ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
114 if (strcmp(ifa->ifa_name, interface.c_str()) == 0 &&
115 ifa->ifa_addr->sa_family == AF_INET) {
116 ret = ParseIntefaceAttributes(ifa);
117 break;
118 }
119 }
120 freeifaddrs(ifa_list);
121 return ret;
122 }
123 };
124
125 template <typename T>
BuildPropertyDefinition(const std::string & prop_name,const T & prop_value)126 std::string BuildPropertyDefinition(const std::string& prop_name,
127 const T& prop_value) {
128 std::ostringstream stream;
129 stream << prop_name << "=" << prop_value;
130 return stream.str();
131 }
132 } // namespace
133
ConfigureRil(vsoc::CuttlefishConfig * config)134 void ConfigureRil(vsoc::CuttlefishConfig* config) {
135 NetConfig netconfig;
136 if (!netconfig.ObtainConfig(config->mobile_bridge_name())) {
137 LOG(ERROR) << "Unable to obtain the network configuration";
138 return;
139 }
140
141 config->add_kernel_cmdline(BuildPropertyDefinition(
142 CUTTLEFISH_RIL_ADDR_PROPERTY, netconfig.ril_ipaddr));
143 config->add_kernel_cmdline(BuildPropertyDefinition(
144 CUTTLEFISH_RIL_GATEWAY_PROPERTY, netconfig.ril_gateway));
145 config->add_kernel_cmdline(BuildPropertyDefinition(
146 CUTTLEFISH_RIL_DNS_PROPERTY, netconfig.ril_dns));
147 config->add_kernel_cmdline(BuildPropertyDefinition(
148 CUTTLEFISH_RIL_BROADCAST_PROPERTY, netconfig.ril_broadcast));
149 config->add_kernel_cmdline(BuildPropertyDefinition(
150 CUTTLEFISH_RIL_PREFIXLEN_PROPERTY, netconfig.ril_prefixlen));
151 }
152