From aa60207559bb57760cf4d29944e1678387945bde Mon Sep 17 00:00:00 2001
From: daniel <daniel@planethacker.net>
Date: Wed, 7 May 2025 08:53:03 -0700
Subject: initial commit

---
 Makefile  |  5 +++++
 README.md | 26 +++++++++++++++++++++
 bin2sh.c  | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100644 bin2sh.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c279619
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+all:
+	gcc -o bin2sh bin2sh.c
+
+clean:
+	rm -rf bin2sh
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..d3eac86
--- /dev/null
+++ b/README.md
@@ -0,0 +1,26 @@
+# bin2sh
+
+This converts any file to a shell script, which outputs itself.
+
+This makes it easy to copy/paste a binary into a netcat session to
+transfer a file to another system.
+
+## Building
+```
+make
+```
+
+## Example
+```
+ % ./bin2sh Makefile
+echo -ne "\x61\x6c\x6c\x3a\x0a\x09\x67\x63\x63\x20\x2d\x6f\x20\x62\x69\x6e"
+echo -ne "\x32\x73\x68\x20\x62\x69\x6e\x32\x73\x68\x2e\x63\x0a\x0a\x63\x6c"
+echo -ne "\x65\x61\x6e\x3a\x0a\x09\x72\x6d\x20\x2d\x72\x66\x20\x62\x69\x6e"
+echo -ne "\x32\x73\x68\x0a"
+
+ % ./bin2sh Makefile |bash > mf2
+
+ % md5sum mf2 Makefile
+2c36f087e9cc78f3a6406f89e70728db  mf2
+2c36f087e9cc78f3a6406f89e70728db  Makefile
+```
diff --git a/bin2sh.c b/bin2sh.c
new file mode 100644
index 0000000..2ec81dd
--- /dev/null
+++ b/bin2sh.c
@@ -0,0 +1,77 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#define WIDTH 10
+
+
+void usage(const char *progname) {
+	fprintf(stderr, "usage: %s <file> [-r <file>] [-w <width>]\n", progname);
+}
+
+
+int main(int argc, char *argv[]) {
+	FILE *fp;
+	uint8_t buf[1];
+	int i = 0;
+	int opt;
+	char *redir = NULL;
+	unsigned int width = WIDTH;
+	bool r = false;
+
+
+	if (argc < 2) {
+		usage(argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	while ((opt = getopt(argc, argv, "w:r:")) != -1) {
+		switch (opt) {
+		case 'w':
+			width = atoi(optarg);
+			break;
+		case 'r':
+			redir = optarg;
+			break;
+		default:
+			usage(argv[0]);
+			return EXIT_FAILURE;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	fp = fopen(argv[0], "rb");
+	if (fp == NULL) {
+		fprintf(stderr, "Unable to open %s: %s\n", argv[1], strerror(errno));
+		return EXIT_FAILURE;
+	}
+
+ 	printf("echo -ne \"");
+
+	while(fread(buf, 1, 1, fp)) {
+		i++;
+		printf("\\x%02x", buf[0]);
+		if (i % width == 0) {
+			if (redir) {
+				printf("\" %s %s\n", r ? ">>" : ">", redir);
+				r = true;
+			} else {
+				printf("\"\n");
+			}
+			printf("echo -ne \"");
+		}
+	}
+
+	if (i % WIDTH != 0)
+		printf("\"\n");
+
+	fclose(fp);
+
+	return EXIT_SUCCESS;
+}
-- 
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