aboutsummaryrefslogtreecommitdiff
path: root/archival/ar.c
blob: 253f3348a51dec812717133ce7bd705816ae7095 (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
/* vi: set sw=4 ts=4: */
/*
 * Mini ar implementation for busybox 
 *
 * Copyright (C) 2000 by Glenn McGrath
 * Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000
 *
 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */


#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include "internal.h"

#define AR_BLOCK_SIZE 60
#define BB_DECLARE_EXTERN
#define bb_need_io_error
#include "messages.c"

struct ArHeader {				/* Byte Offset */
	char ar_name[16];			/*  0-15 */
	char ar_date[12];			/* 16-27 */
	char ar_uid[6], ar_gid[6];	/* 28-39 */
	char ar_mode[8];			/* 40-47 */
	char ar_size[10];			/* 48-57 */
	char ar_fmag[2];			/* 58-59 */
};
typedef struct ArHeader ArHeader;

struct ArInfo {
	char name[17];				/* File name */
	time_t date;				/* long int, No of seconds since epoch */
	uid_t uid;					/* unsigned int, Numeric UID */
	gid_t gid;					/* unsigned int, Numeric GID */
	mode_t mode;				/* unsigned int, Unix mode */
	size_t size;				/* int, Size of the file */
};
typedef struct ArInfo ArInfo;

static const char ar_usage[] = "ar [optxvV] archive [filenames] \n"
#ifndef BB_FEATURE_TRIVIAL_HELP
	"\nExtract or list files from an ar archive.\n\n"
	"Options:\n"
	"\to\t\tpreserve original dates\n"
	"\tp\t\textract to stdout\n"
	"\tt\t\tlist\n"
	"\tx\t\textract\n"
	"\tv\t\tverbosely list files processed\n"
#endif
	;

static void displayContents(struct ArInfo *entry, int funct)
{
	/* TODO convert mode to string */
	if ((funct & 2) == 2)
		printf("%i %i/%i %6i %s ", entry->mode, entry->uid, entry->gid,
			   entry->size, timeString(entry->date));
	printf("%s\n", entry->name);
}

/* Converts to new typed struct */
static int readArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
{
	int count2;
	int count;

	for (count = 0; count < 16; count++) {
		if (rawHeader->ar_name[count] == ' ') {
			for (count2 = count; count2 < 16; count2++)
				if (!isspace(rawHeader->ar_name[count2]))
					break;
			if (count2 >= 16)
				break;
		}
		if (rawHeader->ar_name[count] == '/')
			break;
		header->name[count] = rawHeader->ar_name[count];
	}
	header->name[count] = '\0';
	header->date = atoi(rawHeader->ar_date);
	header->uid = atoi(rawHeader->ar_uid);
	header->gid = atoi(rawHeader->ar_gid);
	header->mode = atoi(rawHeader->ar_mode);
	header->size = atoi(rawHeader->ar_size);
	return (TRUE);
}

/*
 * Copy size bytes from current position if srcFd to current position in dstFd
 * taken from tarExtractRegularFile in tar.c
 * could be used for ar, tar and copyFile .  
 */
static int copySubFile(int srcFd, int dstFd, int copySize)
{
	int readSize, writeSize, doneSize;
	char buffer[BUFSIZ];

	while (copySize > 0) {
		if (copySize > BUFSIZ)
			readSize = BUFSIZ;
		else
			readSize = copySize;
		writeSize = fullRead(srcFd, buffer, readSize);
		if (writeSize <= 0) {
			errorMsg(io_error, "copySubFile :", strerror(errno));
			return (FALSE);
		}
		doneSize = fullWrite(dstFd, buffer, writeSize);
		if (doneSize <= 0) {
			errorMsg(io_error, "copySubFile :", strerror(errno));
			return (FALSE);
		}
		copySize -= doneSize;
	}
	return (TRUE);
}

/*
 * Need to add checks, stat newfile before creation,change mode from 0777
 * extract to current dir
 * dstStat.st_size copied from current position of file pointed to by srcFd
 */
static int extractToFile(int srcFd, const char *path, const char *name,
						 int size)
{
	int dstFd, temp;
	struct stat tmpStat;
	char *pathname = NULL;

	if ((temp = isDirectory(path, TRUE, &tmpStat)) != TRUE) {
		if (!createPath(path, 0777)) {
			fatalError("Cannot extract to specified path");
			return (FALSE);
		}
	}
	temp = (strlen(path) + 16);
	pathname = (char *) xmalloc(temp);
	pathname = strcpy(pathname, path);
	pathname = strcat(pathname, &name[0]);
	dstFd = device_open(pathname, O_WRONLY | O_CREAT);
	pathname = NULL;
	temp = copySubFile(srcFd, dstFd, size);
	close(dstFd);
	return (TRUE);
}

/* Step through the ar file entries  */
static int readArFile(char **fileNames, int argc, int funct)
{
	int arFd = 0;
	int pdates = 0;
	int verbose = 0;
	int display = 0;
	int extract = 0;
	int extToStdout = 0;
	int status = 0;
	int found = 0;
	ArHeader rawArHeader;
	ArInfo arEntry;
	char arVersion[8];
	char *arName;
	char *selName[argc - 2];
	int i;

	if ((funct & 1) == 1)
		pdates = 1;
	if ((funct & 2) == 2)
		verbose = 1;
	if ((funct & 4) == 4)
		display = 1;
	if ((funct & 16) == 16) {	/* extract to stdout */
		extract = 1;
		extToStdout = 1;
	}
	if ((funct & 8) == 8) {		/* extract to file */
		extract = 1;
	}
	arName = fileNames[2];
	for (i = 0; i < (argc - 3); i++)
		selName[i] = fileNames[i + 3];
	arFd = open(arName, O_RDONLY);
	if (arFd < 0) {
		errorMsg("Error opening '%s': %s\n", arName, strerror(errno));
		return (FALSE);
	}
	if (fullRead(arFd, arVersion, 8) <= 0) {
		errorMsg("ar: Unexpected EOF in archive\n");
		return (FALSE);
	}
	if (strncmp(arVersion, "!<arch>", 7) != 0) {
		errorMsg("ar header fails check ");
		return (FALSE);
	}
	while ((status = fullRead(arFd, (char *) &rawArHeader, AR_BLOCK_SIZE))
		   == AR_BLOCK_SIZE) {
		readArHeader(&rawArHeader, &arEntry);

		if (display == 1) {
			displayContents(&arEntry, funct);
		}
		if (argc == 3)
			found = 1;
		else {
			found = 0;
			for (i = 0; i < (argc - 3); i++) {
				if ((status = (strcmp(selName[i], arEntry.name))) == 0)
					found = 1;
			}
		}
		if ((extract == 1) && (found == 1)) {
			if (extToStdout == 1) {
				copySubFile(arFd, fileno(stdout), arEntry.size);
			} else {
				extractToFile(arFd, "./", arEntry.name, arEntry.size);
			}
		} else
			lseek(arFd, arEntry.size, SEEK_CUR);
	}
	return (0);
}

extern int ar_main(int argc, char **argv)
{
	int ret = 0;
	char *opt_ptr;
	char c;
	int funct = 0;

	if (argc < 2)
		usage(ar_usage);

	opt_ptr = argv[1];
	if (*opt_ptr == '-')
		++opt_ptr;
	while ((c = *opt_ptr++) != '\0') {
		switch (c) {
		case 'o':				/* preserver original dates */
			funct = funct | 1;
			break;
		case 'p':				/* extract to stdout */
			funct = funct | 16;
			break;
		case 't':				/* display contents */
			funct = funct | 4;
			break;
		case 'x':				/* extract contents of archive */
			funct = funct | 8;
			break;
		case 'v':				/* be verbose */
			funct = funct | 2;
			break;
		default:
			usage(ar_usage);
		}
	}
	if (funct > 3)
		ret = readArFile(argv, argc, funct);
	return (ret);
}