1 | /* Find network interface names and index numbers. Hurd version. |
2 | Copyright (C) 2000-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library 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 GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <error.h> |
20 | #include <net/if.h> |
21 | #include <string.h> |
22 | #include <sys/ioctl.h> |
23 | #include <unistd.h> |
24 | |
25 | #include <hurd.h> |
26 | #include <hurd/ioctl.h> |
27 | #include <hurd/pfinet.h> |
28 | |
29 | /* Return the interface index corresponding to interface IFNAME. |
30 | On error, return 0. */ |
31 | unsigned int |
32 | __if_nametoindex (const char *ifname) |
33 | { |
34 | struct ifreq ifr; |
35 | int fd = __socket (AF_INET, SOCK_DGRAM, 0); |
36 | |
37 | if (fd < 0) |
38 | return 0; |
39 | |
40 | if (strlen (ifname) >= IFNAMSIZ) |
41 | { |
42 | __set_errno (ENODEV); |
43 | return 0; |
44 | } |
45 | |
46 | strncpy (ifr.ifr_name, ifname, IFNAMSIZ); |
47 | if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0) |
48 | { |
49 | int saved_errno = errno; |
50 | __close (fd); |
51 | if (saved_errno == EINVAL || saved_errno == ENOTTY) |
52 | __set_errno (ENOSYS); |
53 | return 0; |
54 | } |
55 | __close (fd); |
56 | return ifr.ifr_ifindex; |
57 | } |
58 | libc_hidden_def (__if_nametoindex) |
59 | weak_alias (__if_nametoindex, if_nametoindex) |
60 | libc_hidden_weak (if_nametoindex) |
61 | |
62 | /* Free the structure IFN returned by if_nameindex. */ |
63 | void |
64 | __if_freenameindex (struct if_nameindex *ifn) |
65 | { |
66 | struct if_nameindex *ptr = ifn; |
67 | while (ptr->if_name || ptr->if_index) |
68 | { |
69 | free (ptr->if_name); |
70 | ++ptr; |
71 | } |
72 | free (ifn); |
73 | } |
74 | libc_hidden_def (__if_freenameindex) |
75 | weak_alias (__if_freenameindex, if_freenameindex) |
76 | libc_hidden_weak (if_freenameindex) |
77 | |
78 | /* Return an array of if_nameindex structures, one for each network |
79 | interface present, plus one indicating the end of the array. On |
80 | error, return NULL. */ |
81 | struct if_nameindex * |
82 | __if_nameindex (void) |
83 | { |
84 | error_t err = 0; |
85 | char data[2048]; |
86 | file_t server; |
87 | int fd = __socket (AF_INET, SOCK_DGRAM, 0); |
88 | struct ifconf ifc; |
89 | unsigned int nifs, i; |
90 | struct if_nameindex *idx = NULL; |
91 | |
92 | ifc.ifc_buf = data; |
93 | |
94 | if (fd < 0) |
95 | return NULL; |
96 | |
97 | server = _hurd_socket_server (PF_INET, 0); |
98 | if (server == MACH_PORT_NULL) |
99 | nifs = 0; |
100 | else |
101 | { |
102 | size_t len = sizeof data; |
103 | err = __pfinet_siocgifconf (server, -1, &ifc.ifc_buf, &len); |
104 | if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED) |
105 | { |
106 | /* On the first use of the socket server during the operation, |
107 | allow for the old server port dying. */ |
108 | server = _hurd_socket_server (PF_INET, 1); |
109 | if (server == MACH_PORT_NULL) |
110 | goto out; |
111 | err = __pfinet_siocgifconf (server, -1, &ifc.ifc_buf, &len); |
112 | } |
113 | if (err) |
114 | goto out; |
115 | |
116 | ifc.ifc_len = len; |
117 | nifs = len / sizeof (struct ifreq); |
118 | } |
119 | |
120 | idx = malloc ((nifs + 1) * sizeof (struct if_nameindex)); |
121 | if (idx == NULL) |
122 | { |
123 | err = ENOBUFS; |
124 | goto out; |
125 | } |
126 | |
127 | for (i = 0; i < nifs; ++i) |
128 | { |
129 | struct ifreq *ifr = &ifc.ifc_req[i]; |
130 | idx[i].if_name = __strdup (ifr->ifr_name); |
131 | if (idx[i].if_name == NULL |
132 | || __ioctl (fd, SIOCGIFINDEX, ifr) < 0) |
133 | { |
134 | unsigned int j; |
135 | err = errno; |
136 | |
137 | for (j = 0; j < i; ++j) |
138 | free (idx[j].if_name); |
139 | free (idx); |
140 | idx = NULL; |
141 | |
142 | if (err == EINVAL) |
143 | err = ENOSYS; |
144 | else if (err == ENOMEM) |
145 | err = ENOBUFS; |
146 | goto out; |
147 | } |
148 | idx[i].if_index = ifr->ifr_ifindex; |
149 | } |
150 | |
151 | idx[i].if_index = 0; |
152 | idx[i].if_name = NULL; |
153 | |
154 | out: |
155 | __close (fd); |
156 | if (data != ifc.ifc_buf) |
157 | __vm_deallocate (__mach_task_self (), (vm_address_t) ifc.ifc_buf, |
158 | ifc.ifc_len); |
159 | __set_errno (err); |
160 | return idx; |
161 | } |
162 | weak_alias (__if_nameindex, if_nameindex) |
163 | libc_hidden_weak (if_nameindex) |
164 | |
165 | /* Store the name of the interface corresponding to index IFINDEX in |
166 | IFNAME (which has space for at least IFNAMSIZ characters). Return |
167 | IFNAME, or NULL on error. */ |
168 | char * |
169 | __if_indextoname (unsigned int ifindex, char ifname[IF_NAMESIZE]) |
170 | { |
171 | struct ifreq ifr; |
172 | int fd = __socket (AF_INET, SOCK_DGRAM, 0); |
173 | |
174 | if (fd < 0) |
175 | return NULL; |
176 | |
177 | ifr.ifr_ifindex = ifindex; |
178 | if (__ioctl (fd, SIOCGIFNAME, &ifr) < 0) |
179 | { |
180 | int saved_errno = errno; |
181 | __close (fd); |
182 | if (saved_errno == EINVAL || saved_errno == ENOTTY) |
183 | __set_errno (ENOSYS); |
184 | else if (saved_errno == ENODEV) |
185 | __set_errno (ENXIO); |
186 | return NULL; |
187 | } |
188 | __close (fd); |
189 | return strncpy (ifname, ifr.ifr_name, IFNAMSIZ); |
190 | } |
191 | weak_alias (__if_indextoname, if_indextoname) |
192 | libc_hidden_weak (if_indextoname) |
193 | |
194 | #if 0 |
195 | void |
196 | __protocol_available (int *have_inet, int *have_inet6) |
197 | { |
198 | *have_inet = _hurd_socket_server (PF_INET, 0) != MACH_PORT_NULL; |
199 | *have_inet6 = _hurd_socket_server (PF_INET6, 0) != MACH_PORT_NULL; |
200 | } |
201 | #endif |
202 | |