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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/cu/xmodem.c	Lines:	0	94	0.0 %
Date:	2017-11-13	Branches:	0	60	0.0 %


/* $OpenBSD: xmodem.c,v 1.9 2016/02/04 18:33:30 millert Exp $ */

/*
 * Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include "cu.h"

#define XMODEM_BLOCK 128
#define XMODEM_RETRIES 10

#define XMODEM_SOH '\001'
#define XMODEM_EOT '\004'
#define XMODEM_ACK '\006'
#define XMODEM_NAK '\025'
#define XMODEM_SUB '\032'
#define XMODEM_C   '\103'

volatile sig_atomic_t xmodem_stop;

void		xmodem_signal(int sig);
uint16_t	xmodem_crc16(const u_char *buf, size_t len);
int		xmodem_read(char *c);
int		xmodem_write(const u_char *buf, size_t len);

void
xmodem_signal(int sig)
{
	xmodem_stop = 1;
}

uint16_t
xmodem_crc16(const u_char *buf, size_t len)
{
	uint16_t	crc;
	u_int		i, j;

	crc = 0;
	for (i = 0; i < len; i++) {
		crc = crc ^ *buf++ << 8;
		for (j = 0; j < 8; j++)
			if (crc & 0x8000)
				crc = crc << 1 ^ 0x1021;
			else
				crc = crc << 1;
	}
	return (crc);
}

int
xmodem_read(char *c)
{
	for (;;) {
		switch (read(line_fd, c, 1)) {
		case -1:
			if (errno == EINTR && !xmodem_stop)
				continue;
			return (-1);
		case 0:
			errno = EPIPE;
			return (-1);
		case 1:
			return (0);
		}
	}
}

int
xmodem_write(const u_char *buf, size_t len)
{
	ssize_t	n;

	while (len > 0) {
		n = write(line_fd, buf, len);
		if (n == -1) {
			if (errno == EINTR && !xmodem_stop)
				continue;
			return (-1);
		}
		buf += n;
		len -= n;
	}
	return (0);
}

void
xmodem_send(const char *file)
{
	FILE			*f;
	u_char			 buf[3 + XMODEM_BLOCK + 2], c;
	size_t			 len, pktlen;
	uint8_t			 num;
	uint16_t		 crc;
	int			 crc_mode;
	u_int			 i, total;
	struct termios		 tio;
	struct sigaction	 act, oact;

	f = fopen(file, "r");
	if (f == NULL) {
		cu_warn("%s", file);
		return;
	}

	memset(&act, 0, sizeof(act));
	sigemptyset(&act.sa_mask);
	act.sa_flags = 0;
	act.sa_handler = xmodem_signal;
	if (sigaction(SIGINT, &act, &oact) != 0)
		cu_err(1, "sigaction");
	xmodem_stop = 0;

	if (isatty(STDIN_FILENO)) {
		memcpy(&tio, &saved_tio, sizeof(tio));
		tio.c_lflag &= ~ECHO;
		if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
			cu_err(1, "tcsetattr");
	}
	set_blocking(line_fd, 1);
	tcflush(line_fd, TCIFLUSH);

	if (xmodem_read(&c) != 0)
		goto fail;
	if (c == XMODEM_C)
		crc_mode = 1;
	else if (c == XMODEM_NAK)
		crc_mode = 0;
	else {
		cu_warnx("%s: unexpected response \\%03hho", file, c);
		goto fail;
	}

	num = 1;
	total = 1;
	pktlen = 3 + XMODEM_BLOCK + (crc_mode ? 2 : 1);
	for (;;) {
		len = fread(buf + 3, 1, XMODEM_BLOCK, f);
		if (len == 0)
			break;
		memset(buf + 3 + len, XMODEM_SUB, XMODEM_BLOCK - len);

		buf[0] = XMODEM_SOH;
		buf[1] = num;
		buf[2] = 255 - num;

		if (crc_mode) {
			crc = xmodem_crc16(buf + 3, XMODEM_BLOCK);
			buf[3 + XMODEM_BLOCK] = crc >> 8;
			buf[3 + XMODEM_BLOCK + 1] = crc & 0xFF;
		} else {
			buf[3 + XMODEM_BLOCK] = 0;
			for (i = 0; i < XMODEM_BLOCK; i++)
				buf[3 + XMODEM_BLOCK] += buf[3 + i];
		}

		for (i = 0; i < XMODEM_RETRIES; i++) {
			if (xmodem_stop) {
				errno = EINTR;
				goto fail;
			}
			cu_warnx("%s: sending block %u (attempt %u)", file,
			    total, 1 + i);
			if (xmodem_write(buf, pktlen) != 0)
				goto fail;

			if (xmodem_read(&c) != 0)
				goto fail;
			if (c == XMODEM_ACK)
				break;
			if (c != XMODEM_NAK) {
				cu_warnx("%s: unexpected response \\%03hho",
				    file, c);
			}
		}
		if (i == XMODEM_RETRIES) {
			cu_warnx("%s: too many retries", file);
			goto out;
		}

		if (len < XMODEM_BLOCK)
			break;
		num++;
		total++;
	}

	buf[0] = XMODEM_EOT;
	if (xmodem_write(buf, 1) != 0)
		goto fail;
	cu_warnx("%s: completed %u blocks", file, num);

	goto out;

fail:
	cu_warn("%s", file);

out:
	set_blocking(line_fd, 0);
	set_termios();

	sigaction(SIGINT, &oact, NULL);

	fclose(f);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: xmodem.c,v 1.9 2016/02/04 18:33:30 millert Exp $ */
2
3			/*
4			* Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15			* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16			* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/types.h>
20
21			#include <errno.h>
22			#include <signal.h>
23			#include <stdint.h>
24			#include <stdio.h>
25			#include <string.h>
26			#include <termios.h>
27			#include <unistd.h>
28
29			#include "cu.h"
30
31			#define XMODEM_BLOCK 128
32			#define XMODEM_RETRIES 10
33
34			#define XMODEM_SOH '\001'
35			#define XMODEM_EOT '\004'
36			#define XMODEM_ACK '\006'
37			#define XMODEM_NAK '\025'
38			#define XMODEM_SUB '\032'
39			#define XMODEM_C '\103'
40
41			volatile sig_atomic_t xmodem_stop;
42
43			void xmodem_signal(int sig);
44			uint16_t xmodem_crc16(const u_char *buf, size_t len);
45			int xmodem_read(char *c);
46			int xmodem_write(const u_char *buf, size_t len);
47
48			void
49			xmodem_signal(int sig)
50			{
51			xmodem_stop = 1;
52			}
53
54			uint16_t
55			xmodem_crc16(const u_char *buf, size_t len)
56			{
57			uint16_t crc;
58			u_int i, j;
59
60			crc = 0;
61			for (i = 0; i < len; i++) {
62			crc = crc ^ *buf++ << 8;
63			for (j = 0; j < 8; j++)
64			if (crc & 0x8000)
65			crc = crc << 1 ^ 0x1021;
66			else
67			crc = crc << 1;
68			}
69			return (crc);
70			}
71
72			int
73			xmodem_read(char *c)
74			{
75			for (;;) {
76			switch (read(line_fd, c, 1)) {
77			case -1:
78			if (errno == EINTR && !xmodem_stop)
79			continue;
80			return (-1);
81			case 0:
82			errno = EPIPE;
83			return (-1);
84			case 1:
85			return (0);
86			}
87			}
88			}
89
90			int
91			xmodem_write(const u_char *buf, size_t len)
92			{
93			ssize_t n;
94
95			while (len > 0) {
96			n = write(line_fd, buf, len);
97			if (n == -1) {
98			if (errno == EINTR && !xmodem_stop)
99			continue;
100			return (-1);
101			}
102			buf += n;
103			len -= n;
104			}
105			return (0);
106			}
107
108			void
109			xmodem_send(const char *file)
110			{
111			FILE *f;
112			u_char buf[3 + XMODEM_BLOCK + 2], c;
113			size_t len, pktlen;
114			uint8_t num;
115			uint16_t crc;
116			int crc_mode;
117			u_int i, total;
118			struct termios tio;
119			struct sigaction act, oact;
120
121			f = fopen(file, "r");
122			if (f == NULL) {
123			cu_warn("%s", file);
124			return;
125			}
126
127			memset(&act, 0, sizeof(act));
128			sigemptyset(&act.sa_mask);
129			act.sa_flags = 0;
130			act.sa_handler = xmodem_signal;
131			if (sigaction(SIGINT, &act, &oact) != 0)
132			cu_err(1, "sigaction");
133			xmodem_stop = 0;
134
135			if (isatty(STDIN_FILENO)) {
136			memcpy(&tio, &saved_tio, sizeof(tio));
137			tio.c_lflag &= ~ECHO;
138			if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
139			cu_err(1, "tcsetattr");
140			}
141			set_blocking(line_fd, 1);
142			tcflush(line_fd, TCIFLUSH);
143
144			if (xmodem_read(&c) != 0)
145			goto fail;
146			if (c == XMODEM_C)
147			crc_mode = 1;
148			else if (c == XMODEM_NAK)
149			crc_mode = 0;
150			else {
151			cu_warnx("%s: unexpected response \\%03hho", file, c);
152			goto fail;
153			}
154
155			num = 1;
156			total = 1;
157			pktlen = 3 + XMODEM_BLOCK + (crc_mode ? 2 : 1);
158			for (;;) {
159			len = fread(buf + 3, 1, XMODEM_BLOCK, f);
160			if (len == 0)
161			break;
162			memset(buf + 3 + len, XMODEM_SUB, XMODEM_BLOCK - len);
163
164			buf[0] = XMODEM_SOH;
165			buf[1] = num;
166			buf[2] = 255 - num;
167
168			if (crc_mode) {
169			crc = xmodem_crc16(buf + 3, XMODEM_BLOCK);
170			buf[3 + XMODEM_BLOCK] = crc >> 8;
171			buf[3 + XMODEM_BLOCK + 1] = crc & 0xFF;
172			} else {
173			buf[3 + XMODEM_BLOCK] = 0;
174			for (i = 0; i < XMODEM_BLOCK; i++)
175			buf[3 + XMODEM_BLOCK] += buf[3 + i];
176			}
177
178			for (i = 0; i < XMODEM_RETRIES; i++) {
179			if (xmodem_stop) {
180			errno = EINTR;
181			goto fail;
182			}
183			cu_warnx("%s: sending block %u (attempt %u)", file,
184			total, 1 + i);
185			if (xmodem_write(buf, pktlen) != 0)
186			goto fail;
187
188			if (xmodem_read(&c) != 0)
189			goto fail;
190			if (c == XMODEM_ACK)
191			break;
192			if (c != XMODEM_NAK) {
193			cu_warnx("%s: unexpected response \\%03hho",
194			file, c);
195			}
196			}
197			if (i == XMODEM_RETRIES) {
198			cu_warnx("%s: too many retries", file);
199			goto out;
200			}
201
202			if (len < XMODEM_BLOCK)
203			break;
204			num++;
205			total++;
206			}
207
208			buf[0] = XMODEM_EOT;
209			if (xmodem_write(buf, 1) != 0)
210			goto fail;
211			cu_warnx("%s: completed %u blocks", file, num);
212
213			goto out;
214
215			fail:
216			cu_warn("%s", file);
217
218			out:
219			set_blocking(line_fd, 0);
220			set_termios();
221
222			sigaction(SIGINT, &oact, NULL);
223
224			fclose(f);
225			}