summaryrefslogtreecommitdiffstats
path: root/package/nvram/src/shutils.c
blob: 49ad41af81dfe8ba01368e44997d8cf8969a389d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
/*
 * Shell-like utility functions
 *
 * Copyright 2004, Broadcom Corporation
 * All Rights Reserved.
 * 
 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
 *
 * $Id$
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <net/ethernet.h>

#include <shutils.h>

/*
 * Reads file and returns contents
 * @param	fd	file descriptor
 * @return	contents of file or NULL if an error occurred
 */
char *
fd2str(int fd)
{
	char *buf = NULL;
	size_t count = 0, n;

	do {
		buf = realloc(buf, count + 512);
		n = read(fd, buf + count, 512);
		if (n < 0) {
			free(buf);
			buf = NULL;
		}
		count += n;
	} while (n == 512);

	close(fd);
	if (buf)
		buf[count] = '\0';
	return buf;
}

/*
 * Reads file and returns contents
 * @param	path	path to file
 * @return	contents of file or NULL if an error occurred
 */
char *
file2str(const char *path)
{
	int fd;

	if ((fd = open(path, O_RDONLY)) == -1) {
		perror(path);
		return NULL;
	}

	return fd2str(fd);
}

/* 
 * Waits for a file descriptor to change status or unblocked signal
 * @param	fd	file descriptor
 * @param	timeout	seconds to wait before timing out or 0 for no timeout
 * @return	1 if descriptor changed status or 0 if timed out or -1 on error
 */
int
waitfor(int fd, int timeout)
{
	fd_set rfds;
	struct timeval tv = { timeout, 0 };

	FD_ZERO(&rfds);
	FD_SET(fd, &rfds);
	return select(fd + 1, &rfds, NULL, NULL, (timeout > 0) ? &tv : NULL);
}

/* 
 * Concatenates NULL-terminated list of arguments into a single
 * commmand and executes it
 * @param	argv	argument list
 * @param	path	NULL, ">output", or ">>output"
 * @param	timeout	seconds to wait before timing out or 0 for no timeout
 * @param	ppid	NULL to wait for child termination or pointer to pid
 * @return	return value of executed command or errno
 */
int
_eval(char *const argv[], char *path, int timeout, int *ppid)
{
	pid_t pid;
	int status;
	int fd;
	int flags;
	int sig;
	char buf[254]="";
	int i;

	switch (pid = fork()) {
	case -1:	/* error */
		perror("fork");
		return errno;
	case 0:		/* child */
		/* Reset signal handlers set for parent process */
		for (sig = 0; sig < (_NSIG-1); sig++)
			signal(sig, SIG_DFL);

		/* Clean up */
		ioctl(0, TIOCNOTTY, 0);
		close(STDIN_FILENO);
		close(STDOUT_FILENO);
		close(STDERR_FILENO);
		setsid();

		/* We want to check the board if exist UART? , add by honor 2003-12-04 */
		if ((fd = open("/dev/console", O_RDWR)) < 0) {
                        (void) open("/dev/null", O_RDONLY);
                        (void) open("/dev/null", O_WRONLY);
                        (void) open("/dev/null", O_WRONLY);
		}
		else{
			close(fd);
                        (void) open("/dev/console", O_RDONLY);
                        (void) open("/dev/console", O_WRONLY);
                        (void) open("/dev/console", O_WRONLY);
		}

		/* Redirect stdout to <path> */
		if (path) {
			flags = O_WRONLY | O_CREAT;
			if (!strncmp(path, ">>", 2)) {
				/* append to <path> */
				flags |= O_APPEND;
				path += 2;
			} else if (!strncmp(path, ">", 1)) {
				/* overwrite <path> */
				flags |= O_TRUNC;
				path += 1;
			}
			if ((fd = open(path, flags, 0644)) < 0)
				perror(path);
			else {
				dup2(fd, STDOUT_FILENO);
				close(fd);
			}
		}

		/* execute command */
		for(i=0 ; argv[i] ; i++)
			snprintf(buf+strlen(buf), sizeof(buf), "%s ", argv[i]);
		dprintf("cmd=[%s]\n", buf);
		setenv("PATH", "/sbin:/bin:/usr/sbin:/usr/bin", 1);
		alarm(timeout);
		execvp(argv[0], argv);
		perror(argv[0]);
		exit(errno);
	default:	/* parent */
		if (ppid) {
			*ppid = pid;
			return 0;
		} else {
			waitpid(pid, &status, 0);
			if (WIFEXITED(status))
				return WEXITSTATUS(status);
			else
				return status;
		}
	}
}

/* 
 * Concatenates NULL-terminated list of arguments into a single
 * commmand and executes it
 * @param	argv	argument list
 * @return	stdout of executed command or NULL if an error occurred
 */
char *
_backtick(char *const argv[])
{
	int filedes[2];
	pid_t pid;
	int status;
	char *buf = NULL;

	/* create pipe */
	if (pipe(filedes) == -1) {
		perror(argv[0]);
		return NULL;
	}

	switch (pid = fork()) {
	case -1:	/* error */
		return NULL;
	case 0:		/* child */
		close(filedes[0]);	/* close read end of pipe */
		dup2(filedes[1], 1);	/* redirect stdout to write end of pipe */
		close(filedes[1]);	/* close write end of pipe */
		execvp(argv[0], argv);
		exit(errno);
		break;
	default:	/* parent */
		close(filedes[1]);	/* close write end of pipe */
		buf = fd2str(filedes[0]);
		waitpid(pid, &status, 0);
		break;
	}
	
	return buf;
}

/* 
 * Kills process whose PID is stored in plaintext in pidfile
 * @param	pidfile	PID file
 * @return	0 on success and errno on failure
 */
int
kill_pidfile(char *pidfile)
{
	FILE *fp = fopen(pidfile, "r");
	char buf[256];

	if (fp && fgets(buf, sizeof(buf), fp)) {
		pid_t pid = strtoul(buf, NULL, 0);
		fclose(fp);
		return kill(pid, SIGTERM);
  	} else
		return errno;
}

/*
 * fread() with automatic retry on syscall interrupt
 * @param	ptr	location to store to
 * @param	size	size of each element of data
 * @param	nmemb	number of elements
 * @param	stream	file stream
 * @return	number of items successfully read
 */
int
safe_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
	size_t ret = 0;

	do {
		clearerr(stream);
		ret += fread((char *)ptr + (ret * size), size, nmemb - ret, stream);
	} while (ret < nmemb && ferror(stream) && errno == EINTR);

	return ret;
}

/*
 * fwrite() with automatic retry on syscall interrupt
 * @param	ptr	location to read from
 * @param	size	size of each element of data
 * @param	nmemb	number of elements
 * @param	stream	file stream
 * @return	number of items successfully written
 */
int
safe_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
{
	size_t ret = 0;

	do {
		clearerr(stream);
		ret += fwrite((char *)ptr + (ret * size), size, nmemb - ret, stream);
	} while (ret < nmemb && ferror(stream) && errno == EINTR);

	return ret;
}

/*
 * Convert Ethernet address string representation to binary data
 * @param	a	string in xx:xx:xx:xx:xx:xx notation
 * @param	e	binary data
 * @return	TRUE if conversion was successful and FALSE otherwise
 */
int
ether_atoe(const char *a, unsigned char *e)
{
	char *c = (char *) a;
	int i = 0;

	memset(e, 0, ETHER_ADDR_LEN);
	for (;;) {
		e[i++] = (unsigned char) strtoul(c, &c, 16);
		if (!*c++ || i == ETHER_ADDR_LEN)
			break;
	}
	return (i == ETHER_ADDR_LEN);
}

/*
 * Convert Ethernet address binary data to string representation
 * @param	e	binary data
 * @param	a	string in xx:xx:xx:xx:xx:xx notation
 * @return	a
 */
char *
ether_etoa(const unsigned char *e, char *a)
{
	char *c = a;
	int i;

	for (i = 0; i < ETHER_ADDR_LEN; i++) {
		if (i)
			*c++ = ':';
		c += sprintf(c, "%02X", e[i] & 0xff);
	}
	return a;
}