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
 23int usbip_port = 3240;
 24char *usbip_port_string = "3240";
 25
 26void 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
 53uint32_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
 65uint16_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
 77void 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
 88void 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
 95static 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
122ssize_t usbip_net_recv(int sockfd, void *buff, size_t bufflen)
123{
124	return usbip_net_xmit(sockfd, buff, bufflen, 0);
125}
126
127ssize_t usbip_net_send(int sockfd, void *buff, size_t bufflen)
128{
129	return usbip_net_xmit(sockfd, buff, bufflen, 1);
130}
131
132static 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
140int 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
162int 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;
206err:
207	return -1;
208}
209
210int 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
222int 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
234int 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
246int 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 */
261int 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}