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
|
/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file host.cpp Functions related to getting host specific data (IPs). */
#ifdef ENABLE_NETWORK
#include "../../stdafx.h"
#include "../../debug.h"
#include "address.h"
/**
* Internal implementation for finding the broadcast IPs.
* This function is implemented multiple times for multiple targets.
* @param broadcast the list of broadcasts to write into.
*/
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast);
#if defined(PSP)
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // PSP implementation
{
}
#elif defined(BEOS_NET_SERVER) || defined(__HAIKU__) /* doesn't have neither getifaddrs or net/if.h */
/* Based on Andrew Bachmann's netstat+.c. Big thanks to him! */
extern "C" int _netstat(int fd, char **output, int verbose);
int seek_past_header(char **pos, const char *header)
{
char *new_pos = strstr(*pos, header);
if (new_pos == 0) {
return B_ERROR;
}
*pos += strlen(header) + new_pos - *pos + 1;
return B_OK;
}
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // BEOS implementation
{
int sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
DEBUG(net, 0, "[core] error creating socket");
return;
}
char *output_pointer = NULL;
int output_length = _netstat(sock, &output_pointer, 1);
if (output_length < 0) {
DEBUG(net, 0, "[core] error running _netstat");
return;
}
char **output = &output_pointer;
if (seek_past_header(output, "IP Interfaces:") == B_OK) {
for (;;) {
uint32 n;
int fields, read;
uint8 i1, i2, i3, i4, j1, j2, j3, j4;
uint32 ip;
uint32 netmask;
fields = sscanf(*output, "%u: %hhu.%hhu.%hhu.%hhu, netmask %hhu.%hhu.%hhu.%hhu%n",
&n, &i1, &i2, &i3, &i4, &j1, &j2, &j3, &j4, &read);
read += 1;
if (fields != 9) {
break;
}
ip = (uint32)i1 << 24 | (uint32)i2 << 16 | (uint32)i3 << 8 | (uint32)i4;
netmask = (uint32)j1 << 24 | (uint32)j2 << 16 | (uint32)j3 << 8 | (uint32)j4;
if (ip != INADDR_LOOPBACK && ip != INADDR_ANY) {
sockaddr_storage address;
memset(&address, 0, sizeof(address));
((sockaddr_in*)&address)->sin_addr.s_addr = htonl(ip | ~netmask);
NetworkAddress addr(address, sizeof(sockaddr));
if (!broadcast->Contains(addr)) *broadcast->Append() = addr;
}
if (read < 0) {
break;
}
*output += read;
}
closesocket(sock);
}
}
#elif defined(HAVE_GETIFADDRS)
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // GETIFADDRS implementation
{
struct ifaddrs *ifap, *ifa;
if (getifaddrs(&ifap) != 0) return;
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if (!(ifa->ifa_flags & IFF_BROADCAST)) continue;
if (ifa->ifa_broadaddr == NULL) continue;
if (ifa->ifa_broadaddr->sa_family != AF_INET) continue;
NetworkAddress addr(ifa->ifa_broadaddr, sizeof(sockaddr));
if (!broadcast->Contains(addr)) *broadcast->Append() = addr;
}
freeifaddrs(ifap);
}
#elif defined(WIN32)
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // Win32 implementation
{
SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == INVALID_SOCKET) return;
DWORD len = 0;
int num = 2;
INTERFACE_INFO *ifo = CallocT<INTERFACE_INFO>(num);
for (;;) {
if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, NULL, 0, ifo, num * sizeof(*ifo), &len, NULL, NULL) == 0) break;
free(ifo);
if (WSAGetLastError() != WSAEFAULT) {
closesocket(sock);
return;
}
num *= 2;
ifo = CallocT<INTERFACE_INFO>(num);
}
for (uint j = 0; j < len / sizeof(*ifo); j++) {
if (ifo[j].iiFlags & IFF_LOOPBACK) continue;
if (!(ifo[j].iiFlags & IFF_BROADCAST)) continue;
sockaddr_storage address;
memset(&address, 0, sizeof(address));
/* iiBroadcast is unusable, because it always seems to be set to 255.255.255.255. */
memcpy(&address, &ifo[j].iiAddress.Address, sizeof(sockaddr));
((sockaddr_in*)&address)->sin_addr.s_addr = ifo[j].iiAddress.AddressIn.sin_addr.s_addr | ~ifo[j].iiNetmask.AddressIn.sin_addr.s_addr;
NetworkAddress addr(address, sizeof(sockaddr));
if (!broadcast->Contains(addr)) *broadcast->Append() = addr;
}
free(ifo);
closesocket(sock);
}
#else /* not HAVE_GETIFADDRS */
#include "../../string_func.h"
static void NetworkFindBroadcastIPsInternal(NetworkAddressList *broadcast) // !GETIFADDRS implementation
{
SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == INVALID_SOCKET) return;
char buf[4 * 1024]; // Arbitrary buffer size
struct ifconf ifconf;
ifconf.ifc_len = sizeof(buf);
ifconf.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, &ifconf) == -1) {
closesocket(sock);
return;
}
const char *buf_end = buf + ifconf.ifc_len;
for (const char *p = buf; p < buf_end;) {
const struct ifreq *req = (const struct ifreq*)p;
if (req->ifr_addr.sa_family == AF_INET) {
struct ifreq r;
strecpy(r.ifr_name, req->ifr_name, lastof(r.ifr_name));
if (ioctl(sock, SIOCGIFFLAGS, &r) != -1 &&
(r.ifr_flags & IFF_BROADCAST) &&
ioctl(sock, SIOCGIFBRDADDR, &r) != -1) {
NetworkAddress addr(&r.ifr_broadaddr, sizeof(sockaddr));
if (!broadcast->Contains(addr)) *broadcast->Append() = addr;
}
}
p += sizeof(struct ifreq);
#if defined(AF_LINK) && !defined(SUNOS)
p += req->ifr_addr.sa_len - sizeof(struct sockaddr);
#endif
}
closesocket(sock);
}
#endif /* all NetworkFindBroadcastIPsInternals */
/**
* Find the IPv4 broadcast addresses; IPv6 uses a completely different
* strategy for broadcasting.
* @param broadcast the list of broadcasts to write into.
*/
void NetworkFindBroadcastIPs(NetworkAddressList *broadcast)
{
NetworkFindBroadcastIPsInternal(broadcast);
/* Now display to the debug all the detected ips */
DEBUG(net, 3, "Detected broadcast addresses:");
int i = 0;
for (NetworkAddress *addr = broadcast->Begin(); addr != broadcast->End(); addr++) {
addr->SetPort(NETWORK_DEFAULT_PORT);
DEBUG(net, 3, "%d) %s", i++, addr->GetHostname());
}
}
#endif /* ENABLE_NETWORK */
|
