1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
4 * 2005-2007 Takahiro Hirofuchi
5 */
6
7 #include <sys/socket.h>
8
9 #include <string.h>
10
11 #include <arpa/inet.h>
12 #include <netdb.h>
13 #include <netinet/tcp.h>
14 #include <unistd.h>
15
16 #ifdef HAVE_LIBWRAP
17 #include <tcpd.h>
18 #endif
19
20 #include "usbip_common.h"
21 #include "usbip_network.h"
22
23 int usbip_port = 3240;
24 char *usbip_port_string = "3240";
25
usbip_setup_port_number(char * arg)26 void usbip_setup_port_number(char *arg)
27 {
28 dbg("parsing port arg '%s'", arg);
29 char *end;
30 unsigned long int port = strtoul(arg, &end, 10);
31
32 if (end == arg) {
33 err("port: could not parse '%s' as a decimal integer", arg);
34 return;
35 }
36
37 if (*end != '\0') {
38 err("port: garbage at end of '%s'", arg);
39 return;
40 }
41
42 if (port > UINT16_MAX) {
43 err("port: %s too high (max=%d)",
44 arg, UINT16_MAX);
45 return;
46 }
47
48 usbip_port = port;
49 usbip_port_string = arg;
50 info("using port %d (\"%s\")", usbip_port, usbip_port_string);
51 }
52
usbip_net_pack_uint32_t(int pack,uint32_t num)53 uint32_t usbip_net_pack_uint32_t(int pack, uint32_t num)
54 {
55 uint32_t i;
56
57 if (pack)
58 i = htonl(num);
59 else
60 i = ntohl(num);
61
62 return i;
63 }
64
usbip_net_pack_uint16_t(int pack,uint16_t num)65 uint16_t usbip_net_pack_uint16_t(int pack, uint16_t num)
66 {
67 uint16_t i;
68
69 if (pack)
70 i = htons(num);
71 else
72 i = ntohs(num);
73
74 return i;
75 }
76
usbip_net_pack_usb_device(int pack,struct usbip_usb_device * udev)77 void usbip_net_pack_usb_device(int pack, struct usbip_usb_device *udev)
78 {
79 udev->busnum = usbip_net_pack_uint32_t(pack, udev->busnum);
80 udev->devnum = usbip_net_pack_uint32_t(pack, udev->devnum);
81 udev->speed = usbip_net_pack_uint32_t(pack, udev->speed);
82
83 udev->idVendor = usbip_net_pack_uint16_t(pack, udev->idVendor);
84 udev->idProduct = usbip_net_pack_uint16_t(pack, udev->idProduct);
85 udev->bcdDevice = usbip_net_pack_uint16_t(pack, udev->bcdDevice);
86 }
87
usbip_net_pack_usb_interface(int pack,struct usbip_usb_interface * udev)88 void usbip_net_pack_usb_interface(int pack __attribute__((unused)),
89 struct usbip_usb_interface *udev
90 __attribute__((unused)))
91 {
92 /* uint8_t members need nothing */
93 }
94
usbip_net_xmit(int sockfd,void * buff,size_t bufflen,int sending)95 static ssize_t usbip_net_xmit(int sockfd, void *buff, size_t bufflen,
96 int sending)
97 {
98 ssize_t nbytes;
99 ssize_t total = 0;
100
101 if (!bufflen)
102 return 0;
103
104 do {
105 if (sending)
106 nbytes = send(sockfd, buff, bufflen, 0);
107 else
108 nbytes = recv(sockfd, buff, bufflen, MSG_WAITALL);
109
110 if (nbytes <= 0)
111 return -1;
112
113 buff = (void *)((intptr_t) buff + nbytes);
114 bufflen -= nbytes;
115 total += nbytes;
116
117 } while (bufflen > 0);
118
119 return total;
120 }
121
usbip_net_recv(int sockfd,void * buff,size_t bufflen)122 ssize_t usbip_net_recv(int sockfd, void *buff, size_t bufflen)
123 {
124 return usbip_net_xmit(sockfd, buff, bufflen, 0);
125 }
126
usbip_net_send(int sockfd,void * buff,size_t bufflen)127 ssize_t usbip_net_send(int sockfd, void *buff, size_t bufflen)
128 {
129 return usbip_net_xmit(sockfd, buff, bufflen, 1);
130 }
131
usbip_net_pack_op_common(int pack,struct op_common * op_common)132 static inline void usbip_net_pack_op_common(int pack,
133 struct op_common *op_common)
134 {
135 op_common->version = usbip_net_pack_uint16_t(pack, op_common->version);
136 op_common->code = usbip_net_pack_uint16_t(pack, op_common->code);
137 op_common->status = usbip_net_pack_uint32_t(pack, op_common->status);
138 }
139
usbip_net_send_op_common(int sockfd,uint32_t code,uint32_t status)140 int usbip_net_send_op_common(int sockfd, uint32_t code, uint32_t status)
141 {
142 struct op_common op_common;
143 int rc;
144
145 memset(&op_common, 0, sizeof(op_common));
146
147 op_common.version = USBIP_VERSION;
148 op_common.code = code;
149 op_common.status = status;
150
151 usbip_net_pack_op_common(1, &op_common);
152
153 rc = usbip_net_send(sockfd, &op_common, sizeof(op_common));
154 if (rc < 0) {
155 dbg("usbip_net_send failed: %d", rc);
156 return -1;
157 }
158
159 return 0;
160 }
161
usbip_net_recv_op_common(int sockfd,uint16_t * code,int * status)162 int usbip_net_recv_op_common(int sockfd, uint16_t *code, int *status)
163 {
164 struct op_common op_common;
165 int rc;
166
167 memset(&op_common, 0, sizeof(op_common));
168
169 rc = usbip_net_recv(sockfd, &op_common, sizeof(op_common));
170 if (rc < 0) {
171 dbg("usbip_net_recv failed: %d", rc);
172 goto err;
173 }
174
175 usbip_net_pack_op_common(0, &op_common);
176
177 if (op_common.version != USBIP_VERSION) {
178 err("USBIP Kernel and tool version mismatch: %d %d:",
179 op_common.version, USBIP_VERSION);
180 goto err;
181 }
182
183 switch (*code) {
184 case OP_UNSPEC:
185 break;
186 default:
187 if (op_common.code != *code) {
188 dbg("unexpected pdu %#0x for %#0x", op_common.code,
189 *code);
190 /* return error status */
191 *status = ST_ERROR;
192 goto err;
193 }
194 }
195
196 *status = op_common.status;
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