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
|
/* vi: set ts=4 :*/
/* Toybox infrastructure.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*/
#include "toys.h"
// Populate toy_list[].
#undef NEWTOY
#undef OLDTOY
#define NEWTOY(name, opts, flags) {#name, name##_main, opts, flags},
#define OLDTOY(name, oldname, opts, flags) {#name, oldname##_main, opts, flags},
struct toy_list toy_list[] = {
#include "generated/newtoys.h"
};
#define TOY_LIST_LEN (sizeof(toy_list)/sizeof(struct toy_list))
// global context for this applet.
struct toy_context toys;
union global_union this;
char toybuf[4096];
struct toy_list *toy_find(char *name)
{
int top, bottom, middle;
// If the name starts with "toybox" accept that as a match. Otherwise
// skip the first entry, which is out of order.
if (!strncmp(name,"toybox",6)) return toy_list;
bottom = 1;
// Binary search to find this applet.
top = TOY_LIST_LEN-1;
for (;;) {
int result;
middle = (top+bottom)/2;
if (middle<bottom || middle>top) return NULL;
result = strcmp(name,toy_list[middle].name);
if (!result) return toy_list+middle;
if (result<0) top=--middle;
else bottom = ++middle;
}
}
// Figure out whether or not anything is using the option parsing logic,
// because the compiler can't figure out whether or not to optimize it away
// on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize
// stuff out via dead code elimination.
#undef NEWTOY
#undef OLDTOY
#define NEWTOY(name, opts, flags) opts ||
#define OLDTOY(name, oldname, opts, flags) opts ||
static const int NEED_OPTIONS =
#include "generated/newtoys.h"
0; // Ends the opts || opts || opts...
// Setup toybox global state for this command.
void toy_init(struct toy_list *which, char *argv[])
{
// Drop permissions for non-suid commands.
if (CFG_TOYBOX_SUID) {
uid_t uid = getuid(), euid = geteuid();
if (!(which->flags & TOYFLAG_STAYROOT)) {
if (uid != euid) xsetuid(euid=uid);
} else if (CFG_TOYBOX_DEBUG && uid)
error_exit("Not installed suid root");
if ((which->flags & TOYFLAG_NEEDROOT) && euid)
error_exit("Not root");
}
// Free old toys contents (to be reentrant)
if (toys.optargs != toys.argv+1) free(toys.optargs);
bzero(&toys, sizeof(struct toy_context));
toys.which = which;
toys.argv = argv;
if (NEED_OPTIONS && which->options) get_optflags();
else toys.optargs = argv+1;
if (which->flags & TOYFLAG_UMASK) toys.old_umask = umask(0);
}
// Like exec() but runs an internal toybox command instead of another file.
// Only returns if it can't find the command, otherwise exit() when done.
void toy_exec(char *argv[])
{
struct toy_list *which;
which = toy_find(argv[0]);
if (!which) return;
toy_init(which, argv);
toys.which->toy_main();
exit(toys.exitval);
}
// Multiplexer command, first argument is command to run, rest are args to that.
// If first argument starts with - output list of command install paths.
void toybox_main(void)
{
static char *toy_paths[]={"usr/","bin/","sbin/",0};
int i, len = 0;
if (toys.argv[1]) {
if (toys.argv[1][0]!='-') {
toy_exec(toys.argv+1);
toys.which = toy_list;
error_exit("Unknown command %s",toys.argv[1]);
}
}
// Output list of applets.
for (i=1; i<TOY_LIST_LEN; i++) {
int fl = toy_list[i].flags;
if (fl & TOYMASK_LOCATION) {
if (toys.argv[1]) {
int j;
for (j=0; toy_paths[j]; j++)
if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
}
len += printf("%s ",toy_list[i].name);
if (len>65) {
putchar('\n');
len=0;
}
}
}
putchar('\n');
}
int main(int argc, char *argv[])
{
// Artificial scope to eat less stack for things we call
{
char *name;
// Trim path off of command name
name = rindex(argv[0], '/');
if (!name) name=argv[0];
else name++;
argv[0] = name;
}
// Call the multiplexer, adjusting this argv[] to be its' argv[1].
// (It will adjust it back before calling toy_exec().)
toys.argv = argv-1;
toybox_main();
return 0;
}
|
