1 files changed, 132 insertions, 0 deletions
diff --git a/sys/kern/imgact_shell.c b/sys/kern/imgact_shell.c
new file mode 100644
index 0000000..8480fcc
--- /dev/null
+++ b/sys/kern/imgact_shell.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 1993, David Greenman
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/exec.h>
+#include <sys/imgact.h>
+#include <sys/kernel.h>
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define SHELLMAGIC	0x2123 /* #! */
+#else
+#define SHELLMAGIC	0x2321
+#endif
+
+/*
+ * Shell interpreter image activator. A interpreter name beginning
+ *	at imgp->stringbase is the minimal successful exit requirement.
+ */
+int
+exec_shell_imgact(imgp)
+	struct image_params *imgp;
+{
+	const char *image_header = imgp->image_header;
+	const char *ihp, *line_endp;
+	char *interp;
+
+	/* a shell script? */
+	if (((const short *) image_header)[0] != SHELLMAGIC)
+		return(-1);
+
+	/*
+	 * Don't allow a shell script to be the shell for a shell
+	 *	script. :-)
+	 */
+	if (imgp->interpreted)
+		return(ENOEXEC);
+
+	imgp->interpreted = 1;
+
+	/*
+	 * Copy shell name and arguments from image_header into string
+	 *	buffer.
+	 */
+
+	/*
+	 * Find end of line; return if the line > MAXSHELLCMDLEN long.
+	 */
+	for (ihp = &image_header[2]; *ihp != '\n' && *ihp != '#'; ++ihp) {
+		if (ihp >= &image_header[MAXSHELLCMDLEN])
+			return(ENAMETOOLONG);
+	}
+	line_endp = ihp;
+
+	/* reset for another pass */
+	ihp = &image_header[2];
+
+	/* Skip over leading spaces - until the interpreter name */
+	while ((*ihp == ' ') || (*ihp == '\t')) ihp++;
+
+	/* copy the interpreter name */
+	interp = imgp->interpreter_name;
+	while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t'))
+		*interp++ = *ihp++;
+	*interp = '\0';
+
+	/* Disallow a null interpreter filename */
+	if (*imgp->interpreter_name == '\0')
+		return(ENOEXEC);
+
+	/* reset for another pass */
+	ihp = &image_header[2];
+
+	/* copy the interpreter name and arguments */
+	while (ihp < line_endp) {
+		/* Skip over leading spaces */
+		while ((*ihp == ' ') || (*ihp == '\t')) ihp++;
+
+		if (ihp < line_endp) {
+			/*
+			 * Copy to end of token. No need to watch stringspace
+			 *	because this is at the front of the string buffer
+			 *	and the maximum shell command length is tiny.
+			 */
+			while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t')) {
+				*imgp->stringp++ = *ihp++;
+				imgp->stringspace--;
+			}
+
+			*imgp->stringp++ = 0;
+			imgp->stringspace--;
+
+			imgp->argc++;
+		}
+	}
+
+	imgp->argv0 = imgp->uap->fname;
+
+	return(0);
+}
+
+/*
+ * Tell kern_execve.c about it, with a little help from the linker.
+ */
+static struct execsw shell_execsw = { exec_shell_imgact, "#!" };
+EXEC_SET(shell, shell_execsw);