summaryrefslogtreecommitdiff
path: root/applets/applet_tables.c
blob: f56908420fb7a46c1df325f85fe14f8635982a82 (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
/* vi: set sw=4 ts=4: */
/*
 * Applet table generator.
 * Runs on host and produces include/applet_tables.h
 *
 * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
 *
 * Licensed under GPLv2, see file LICENSE in this tarball for details.
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "../include/autoconf.h"
#include "../include/busybox.h"

struct bb_applet {
	const char *name;
	const char *main;
	enum bb_install_loc_t install_loc;
	enum bb_suid_t need_suid;
	/* true if instead of fork(); exec("applet"); waitpid();
	 * one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
	unsigned char noexec;
	/* Even nicer */
	/* true if instead of fork(); exec("applet"); waitpid();
	 * one can simply call applet_main(argc,argv); */
	unsigned char nofork;
};

/* Define struct bb_applet applets[] */
#include "../include/applets.h"

enum { NUM_APPLETS = ARRAY_SIZE(applets) };

static int offset[NUM_APPLETS];

static int cmp_name(const void *a, const void *b)
{
	const struct bb_applet *aa = a;
	const struct bb_applet *bb = b;
	return strcmp(aa->name, bb->name);
}

int main(int argc, char **argv)
{
	int i;
	int ofs;
	unsigned MAX_APPLET_NAME_LEN = 1;

	qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);

	ofs = 0;
	for (i = 0; i < NUM_APPLETS; i++) {
		offset[i] = ofs;
		ofs += strlen(applets[i].name) + 1;
	}
	/* We reuse 4 high-order bits of offset array for other purposes,
	 * so if they are indeed needed, refuse to proceed */
	if (ofs > 0xfff)
		return 1;
	if (!argv[1])
		return 1;

	i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666);
	if (i < 0)
		return 1;
	dup2(i, 1);

	/* Keep in sync with include/busybox.h! */

	printf("/* This is a generated file, don't edit */\n\n");

	printf("#define NUM_APPLETS %u\n", NUM_APPLETS);
	if (NUM_APPLETS == 1) {
		printf("#define SINGLE_APPLET_STR \"%s\"\n", applets[0].name);
		printf("#define SINGLE_APPLET_MAIN %s_main\n", applets[0].name);
	}
	printf("\n");

	//printf("#ifndef SKIP_definitions\n");
	printf("const char applet_names[] ALIGN1 = \"\"\n");
	for (i = 0; i < NUM_APPLETS; i++) {
		printf("\"%s\" \"\\0\"\n", applets[i].name);
		if (MAX_APPLET_NAME_LEN < strlen(applets[i].name))
			MAX_APPLET_NAME_LEN = strlen(applets[i].name);
	}
	printf(";\n\n");

	printf("#ifndef SKIP_applet_main\n");
	printf("int (*const applet_main[])(int argc, char **argv) = {\n");
	for (i = 0; i < NUM_APPLETS; i++) {
		printf("%s_main,\n", applets[i].main);
	}
	printf("};\n");
	printf("#endif\n\n");

	printf("const uint16_t applet_nameofs[] ALIGN2 = {\n");
	for (i = 0; i < NUM_APPLETS; i++) {
		printf("0x%04x,\n",
			offset[i]
#if ENABLE_FEATURE_PREFER_APPLETS
			+ (applets[i].nofork << 12)
			+ (applets[i].noexec << 13)
#endif
#if ENABLE_FEATURE_SUID
			+ (applets[i].need_suid << 14) /* 2 bits */
#endif
		);
	}
	printf("};\n\n");

#if ENABLE_FEATURE_INSTALLER
	printf("const uint8_t applet_install_loc[] ALIGN1 = {\n");
	i = 0;
	while (i < NUM_APPLETS) {
		int v = applets[i].install_loc; /* 3 bits */
		if (++i < NUM_APPLETS)
			v |= applets[i].install_loc << 4; /* 3 bits */
		printf("0x%02x,\n", v);
		i++;
	}
	printf("};\n");
#endif
	//printf("#endif /* SKIP_definitions */\n");
	printf("\n");
	printf("#define MAX_APPLET_NAME_LEN %u\n", MAX_APPLET_NAME_LEN);

	if (argv[2]) {
		char line_old[80];
		char line_new[80];
		FILE *fp;

		line_old[0] = 0;
		fp = fopen(argv[2], "r");
		if (fp) {
			fgets(line_old, sizeof(line_old), fp);
			fclose(fp);
		}
		sprintf(line_new, "#define NUM_APPLETS %u\n", NUM_APPLETS);
		if (strcmp(line_old, line_new) != 0) {
			fp = fopen(argv[2], "w");
			if (!fp)
				return 1;
			fputs(line_new, fp);
		}
	}

	return 0;
}