1 /*
2 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
3 * 2005-2007 Takahiro Hirofuchi
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program 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
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include <sys/socket.h>
20
21 #include <string.h>
22
23 #include <arpa/inet.h>
24 #include <netdb.h>
25 #include <netinet/tcp.h>
26 #include <unistd.h>
27
28 #ifdef HAVE_LIBWRAP
29 #include <tcpd.h>
30 #endif
31
32 #include "usbip_common.h"
33 #include "usbip_network.h"
34
35 int usbip_port = 3240;
36 char *usbip_port_string = "3240";
37
usbip_setup_port_number(char * arg)38 void usbip_setup_port_number(char *arg)
39 {
40 dbg("parsing port arg '%s'", arg);
41 char *end;
42 unsigned long int port = strtoul(arg, &end, 10);
43
44 if (end == arg) {
45 err("port: could not parse '%s' as a decimal integer", arg);
46 return;
47 }
48
49 if (*end != '\0') {
50 err("port: garbage at end of '%s'", arg);
51 return;
52 }
53
54 if (port > UINT16_MAX) {
55 err("port: %s too high (max=%d)",
56 arg, UINT16_MAX);
57 return;
58 }
59
60 usbip_port = port;
61 usbip_port_string = arg;
62 info("using port %d (\"%s\")", usbip_port, usbip_port_string);
63 }
64
usbip_net_pack_uint32_t(int pack,uint32_t * num)65 void usbip_net_pack_uint32_t(int pack, uint32_t *num)
66 {
67 uint32_t i;
68
69 if (pack)
70 i = htonl(*num);
71 else
72 i = ntohl(*num);
73
74 *num = i;
75 }
76
usbip_net_pack_uint16_t(int pack,uint16_t * num)77 void usbip_net_pack_uint16_t(int pack, uint16_t *num)
78 {
79 uint16_t i;
80
81 if (pack)
82 i = htons(*num);
83 else
84 i = ntohs(*num);
85
86 *num = i;
87 }
88
usbip_net_pack_usb_device(int pack,struct usbip_usb_device * udev)89 void usbip_net_pack_usb_device(int pack, struct usbip_usb_device *udev)
90 {
91 usbip_net_pack_uint32_t(pack, &udev->busnum);
92 usbip_net_pack_uint32_t(pack, &udev->devnum);
93 usbip_net_pack_uint32_t(pack, &udev->speed);
94
95 usbip_net_pack_uint16_t(pack, &udev->idVendor);
96 usbip_net_pack_uint16_t(pack, &udev->idProduct);
97 usbip_net_pack_uint16_t(pack, &udev->bcdDevice);
98 }
99
usbip_net_pack_usb_interface(int pack,struct usbip_usb_interface * udev)100 void usbip_net_pack_usb_interface(int pack __attribute__((unused)),
101 struct usbip_usb_interface *udev
102 __attribute__((unused)))
103 {
104 /* uint8_t members need nothing */
105 }
106
usbip_net_xmit(int sockfd,void * buff,size_t bufflen,int sending)107 static ssize_t usbip_net_xmit(int sockfd, void *buff, size_t bufflen,
108 int sending)
109 {
110 ssize_t nbytes;
111 ssize_t total = 0;
112
113 if (!bufflen)
114 return 0;
115
116 do {
117 if (sending)
118 nbytes = send(sockfd, buff, bufflen, 0);
119 else
120 nbytes = recv(sockfd, buff, bufflen, MSG_WAITALL);
121
122 if (nbytes <= 0)
123 return -1;
124
125 buff = (void *)((intptr_t) buff + nbytes);
126 bufflen -= nbytes;
127 total += nbytes;
128
129 } while (bufflen > 0);
130
131 return total;
132 }
133
usbip_net_recv(int sockfd,void * buff,size_t bufflen)134 ssize_t usbip_net_recv(int sockfd, void *buff, size_t bufflen)
135 {
136 return usbip_net_xmit(sockfd, buff, bufflen, 0);
137 }
138
usbip_net_send(int sockfd,void * buff,size_t bufflen)139 ssize_t usbip_net_send(int sockfd, void *buff, size_t bufflen)
140 {
141 return usbip_net_xmit(sockfd, buff, bufflen, 1);
142 }
143
usbip_net_send_op_common(int sockfd,uint32_t code,uint32_t status)144 int usbip_net_send_op_common(int sockfd, uint32_t code, uint32_t status)
145 {
146 struct op_common op_common;
147 int rc;
148
149 memset(&op_common, 0, sizeof(op_common));
150
151 op_common.version = USBIP_VERSION;
152 op_common.code = code;
153 op_common.status = status;
154
155 PACK_OP_COMMON(1, &op_common);
156
157 rc = usbip_net_send(sockfd, &op_common, sizeof(op_common));
158 if (rc < 0) {
159 dbg("usbip_net_send failed: %d", rc);
160 return -1;
161 }
162
163 return 0;
164 }
165
usbip_net_recv_op_common(int sockfd,uint16_t * code)166 int usbip_net_recv_op_common(int sockfd, uint16_t *code)
167 {
168 struct op_common op_common;
169 int rc;
170
171 memset(&op_common, 0, sizeof(op_common));
172
173 rc = usbip_net_recv(sockfd, &op_common, sizeof(op_common));
174 if (rc < 0) {
175 dbg("usbip_net_recv failed: %d", rc);
176 goto err;
177 }
178
179 PACK_OP_COMMON(0, &op_common);
180
181 if (op_common.version != USBIP_VERSION) {
182 dbg("version mismatch: %d %d", op_common.version,
183 USBIP_VERSION);
184 goto err;
185 }
186
187 switch (*code) {
188 case OP_UNSPEC:
189 break;
190 default:
191 if (op_common.code != *code) {
192 dbg("unexpected pdu %#0x for %#0x", op_common.code,
193 *code);
194 goto err;
195 }
196 }
197
198 if (op_common.status != ST_OK) {
199 dbg("request failed at peer: %d", op_common.status);
200 goto err;
201 }
202
203 *code = op_common.code;
204
205 return 0;
206 err:
207 return -1;
208 }
209
usbip_net_set_reuseaddr(int sockfd)210 int usbip_net_set_reuseaddr(int sockfd)
211 {
212 const int val = 1;
213 int ret;
214
215 ret = setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
216 if (ret < 0)
217 dbg("setsockopt: SO_REUSEADDR");
218
219 return ret;
220 }
221
usbip_net_set_nodelay(int sockfd)222 int usbip_net_set_nodelay(int sockfd)
223 {
224 const int val = 1;
225 int ret;
226
227 ret = setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
228 if (ret < 0)
229 dbg("setsockopt: TCP_NODELAY");
230
231 return ret;
232 }
233
usbip_net_set_keepalive(int sockfd)234 int usbip_net_set_keepalive(int sockfd)
235 {
236 const int val = 1;
237 int ret;
238
239 ret = setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val));
240 if (ret < 0)
241 dbg("setsockopt: SO_KEEPALIVE");
242
243 return ret;
244 }
245
usbip_net_set_v6only(int sockfd)246 int usbip_net_set_v6only(int sockfd)
247 {
248 const int val = 1;
249 int ret;
250
251 ret = setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
252 if (ret < 0)
253 dbg("setsockopt: IPV6_V6ONLY");
254
255 return ret;
256 }
257
258 /*
259 * IPv6 Ready
260 */
usbip_net_tcp_connect(char * hostname,char * service)261 int usbip_net_tcp_connect(char *hostname, char *service)
262 {
263 struct addrinfo hints, *res, *rp;
264 int sockfd;
265 int ret;
266
267 memset(&hints, 0, sizeof(hints));
268 hints.ai_family = AF_UNSPEC;
269 hints.ai_socktype = SOCK_STREAM;
270
271 /* get all possible addresses */
272 ret = getaddrinfo(hostname, service, &hints, &res);
273 if (ret < 0) {
274 dbg("getaddrinfo: %s service %s: %s", hostname, service,
275 gai_strerror(ret));
276 return ret;
277 }
278
279 /* try the addresses */
280 for (rp = res; rp; rp = rp->ai_next) {
281 sockfd = socket(rp->ai_family, rp->ai_socktype,
282 rp->ai_protocol);
283 if (sockfd < 0)
284 continue;
285
286 /* should set TCP_NODELAY for usbip */
287 usbip_net_set_nodelay(sockfd);
288 /* TODO: write code for heartbeat */
289 usbip_net_set_keepalive(sockfd);
290
291 if (connect(sockfd, rp->ai_addr, rp->ai_addrlen) == 0)
292 break;
293
294 close(sockfd);
295 }
296
297 freeaddrinfo(res);
298
299 if (!rp)
300 return EAI_SYSTEM;
301
302 return sockfd;
303 }
304