1/*
2 * Copyright (c) 1993, David Greenman
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
| 1/*
2 * Copyright (c) 1993, David Greenman
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
|
27 */
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/sysproto.h>
32#include <sys/exec.h>
33#include <sys/imgact.h>
34#include <sys/kernel.h>
35
36#if BYTE_ORDER == LITTLE_ENDIAN
37#define SHELLMAGIC 0x2123 /* #! */
38#else
39#define SHELLMAGIC 0x2321
40#endif
41
42#define MAXSHELLCMDLEN 64
43
44static int exec_shell_imgact __P((struct image_params *imgp));
45
46/*
47 * Shell interpreter image activator. A interpreter name beginning
48 * at imgp->stringbase is the minimal successful exit requirement.
49 */
50static int
51exec_shell_imgact(imgp)
52 struct image_params *imgp;
53{
54 const char *image_header = imgp->image_header;
55 const char *ihp, *line_endp;
56 char *interp;
57
58 /* a shell script? */
59 if (((const short *) image_header)[0] != SHELLMAGIC)
60 return(-1);
61
62 /*
63 * Don't allow a shell script to be the shell for a shell
64 * script. :-)
65 */
66 if (imgp->interpreted)
67 return(ENOEXEC);
68
69 imgp->interpreted = 1;
70
71 /*
72 * Copy shell name and arguments from image_header into string
73 * buffer.
74 */
75
76 /*
77 * Find end of line; return if the line > MAXSHELLCMDLEN long.
78 */
79 for (ihp = &image_header[2]; *ihp != '\n'; ++ihp) {
80 if (ihp >= &image_header[MAXSHELLCMDLEN])
81 return(ENOEXEC);
82 }
83 line_endp = ihp;
84
85 /* reset for another pass */
86 ihp = &image_header[2];
87
88 /* Skip over leading spaces - until the interpreter name */
89 while ((*ihp == ' ') || (*ihp == '\t')) ihp++;
90
91 /* copy the interpreter name */
92 interp = imgp->interpreter_name;
93 while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t'))
94 *interp++ = *ihp++;
95 *interp = '\0';
96
97 /* Disallow a null interpreter filename */
98 if (*imgp->interpreter_name == '\0')
99 return(ENOEXEC);
100
101 /* reset for another pass */
102 ihp = &image_header[2];
103
104 /* copy the interpreter name and arguments */
105 while (ihp < line_endp) {
106 /* Skip over leading spaces */
107 while ((*ihp == ' ') || (*ihp == '\t')) ihp++;
108
109 if (ihp < line_endp) {
110 /*
111 * Copy to end of token. No need to watch stringspace
112 * because this is at the front of the string buffer
113 * and the maximum shell command length is tiny.
114 */
115 while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t')) {
116 *imgp->stringp++ = *ihp++;
117 imgp->stringspace--;
118 }
119
120 *imgp->stringp++ = 0;
121 imgp->stringspace--;
122
123 imgp->argc++;
124 }
125 }
126
127 imgp->argv0 = imgp->uap->fname;
128
129 return(0);
130}
131
132/*
133 * Tell kern_execve.c about it, with a little help from the linker.
134 * Since `const' objects end up in the text segment, TEXT_SET is the
135 * correct directive to use.
136 */
| 27 */
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/sysproto.h>
32#include <sys/exec.h>
33#include <sys/imgact.h>
34#include <sys/kernel.h>
35
36#if BYTE_ORDER == LITTLE_ENDIAN
37#define SHELLMAGIC 0x2123 /* #! */
38#else
39#define SHELLMAGIC 0x2321
40#endif
41
42#define MAXSHELLCMDLEN 64
43
44static int exec_shell_imgact __P((struct image_params *imgp));
45
46/*
47 * Shell interpreter image activator. A interpreter name beginning
48 * at imgp->stringbase is the minimal successful exit requirement.
49 */
50static int
51exec_shell_imgact(imgp)
52 struct image_params *imgp;
53{
54 const char *image_header = imgp->image_header;
55 const char *ihp, *line_endp;
56 char *interp;
57
58 /* a shell script? */
59 if (((const short *) image_header)[0] != SHELLMAGIC)
60 return(-1);
61
62 /*
63 * Don't allow a shell script to be the shell for a shell
64 * script. :-)
65 */
66 if (imgp->interpreted)
67 return(ENOEXEC);
68
69 imgp->interpreted = 1;
70
71 /*
72 * Copy shell name and arguments from image_header into string
73 * buffer.
74 */
75
76 /*
77 * Find end of line; return if the line > MAXSHELLCMDLEN long.
78 */
79 for (ihp = &image_header[2]; *ihp != '\n'; ++ihp) {
80 if (ihp >= &image_header[MAXSHELLCMDLEN])
81 return(ENOEXEC);
82 }
83 line_endp = ihp;
84
85 /* reset for another pass */
86 ihp = &image_header[2];
87
88 /* Skip over leading spaces - until the interpreter name */
89 while ((*ihp == ' ') || (*ihp == '\t')) ihp++;
90
91 /* copy the interpreter name */
92 interp = imgp->interpreter_name;
93 while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t'))
94 *interp++ = *ihp++;
95 *interp = '\0';
96
97 /* Disallow a null interpreter filename */
98 if (*imgp->interpreter_name == '\0')
99 return(ENOEXEC);
100
101 /* reset for another pass */
102 ihp = &image_header[2];
103
104 /* copy the interpreter name and arguments */
105 while (ihp < line_endp) {
106 /* Skip over leading spaces */
107 while ((*ihp == ' ') || (*ihp == '\t')) ihp++;
108
109 if (ihp < line_endp) {
110 /*
111 * Copy to end of token. No need to watch stringspace
112 * because this is at the front of the string buffer
113 * and the maximum shell command length is tiny.
114 */
115 while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t')) {
116 *imgp->stringp++ = *ihp++;
117 imgp->stringspace--;
118 }
119
120 *imgp->stringp++ = 0;
121 imgp->stringspace--;
122
123 imgp->argc++;
124 }
125 }
126
127 imgp->argv0 = imgp->uap->fname;
128
129 return(0);
130}
131
132/*
133 * Tell kern_execve.c about it, with a little help from the linker.
134 * Since `const' objects end up in the text segment, TEXT_SET is the
135 * correct directive to use.
136 */
|