From 93e1c6e2f6b8794f4fe61625ec44d4a5bf6e6f2e Mon Sep 17 00:00:00 2001
From: RinRi <rin@rinri-d.xyz>
Date: Wed, 23 Nov 2022 20:23:09 +0300
Subject: [PATCH] week11

---
 week11/.gitignore |   1 +
 week11/ex1.sh     |  12 ++++++++++++
 week11/ex2        | Bin 0 -> 20752 bytes
 week11/ex2.c      |  21 +++++++++++++++++++++
 week11/ex2.out    | Bin 0 -> 20752 bytes
 week11/ex2.sh     |  36 ++++++++++++++++++++++++++++++++++++
 week11/ex2.txt    |   5 +++++
 7 files changed, 75 insertions(+)
 create mode 100644 week11/.gitignore
 create mode 100755 week11/ex1.sh
 create mode 100755 week11/ex2
 create mode 100644 week11/ex2.c
 create mode 100755 week11/ex2.out
 create mode 100755 week11/ex2.sh
 create mode 100644 week11/ex2.txt

diff --git a/week11/.gitignore b/week11/.gitignore
new file mode 100644
index 0000000..515478d
--- /dev/null
+++ b/week11/.gitignore
@@ -0,0 +1 @@
+lofs*
diff --git a/week11/ex1.sh b/week11/ex1.sh
new file mode 100755
index 0000000..4cf3a97
--- /dev/null
+++ b/week11/ex1.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+sudo umount lofsdisk
+sudo losetup -d $(sudo losetup -j lofs.img | awk -F ':' '{ print $1; }')
+rm -rf lofsdisk lofs.img
+
+dd if=/dev/zero of=lofs.img bs=100M count=1
+mkfs.ext4 lofs.img
+lodevice=$(sudo losetup -fP --show lofs.img)
+mkdir lofsdisk
+sudo mount "$lodevice" lofsdisk
+sudo chmod -R 777 lofsdisk
diff --git a/week11/ex2 b/week11/ex2
new file mode 100755
index 0000000000000000000000000000000000000000..fc70d2630de5eba9b5266c191da4033e4ab35942
GIT binary patch
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diff --git a/week11/ex2.c b/week11/ex2.c
new file mode 100644
index 0000000..3fdb198
--- /dev/null
+++ b/week11/ex2.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <sys/stat.h>
+
+int main() {
+    DIR *d = opendir("/");
+    if (d == NULL) {
+        perror("opendir");
+        exit(1);
+    }
+
+    struct dirent *entry;
+    while ((entry = readdir(d))!= NULL) {
+        if (entry->d_name[0] == '.')
+            continue;
+
+        printf("%s ", entry->d_name);
+    }
+}
diff --git a/week11/ex2.out b/week11/ex2.out
new file mode 100755
index 0000000000000000000000000000000000000000..fc70d2630de5eba9b5266c191da4033e4ab35942
GIT binary patch
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diff --git a/week11/ex2.sh b/week11/ex2.sh
new file mode 100755
index 0000000..75410c3
--- /dev/null
+++ b/week11/ex2.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+chmod +x ex1.sh
+./ex1.sh
+
+echo "Amirlan" > lofsdisk/file1
+echo "Sharipov" > lofsdisk/file2
+
+mkdir lofsdisk/usr
+mkdir lofsdisk/usr/bin
+mkdir lofsdisk/usr/lib
+mkdir lofsdisk/usr/lib64
+
+# I am using Arch Linux, that's why some libraries may differ from Ubuntu
+# Sorry for the inconvinience
+
+cp /bin/bash /bin/ls /bin/echo /bin/cat lofsdisk/usr/bin
+cp /lib/libreadline.so* lofsdisk/usr/lib/
+cp /lib/libdl.so.2* lofsdisk/usr/lib/
+cp /lib/libc.so* lofsdisk/usr/lib/
+cp /lib/libncursesw.so* lofsdisk/usr/lib/
+cp /lib/libcap.so.2* lofsdisk/usr/lib/
+cp /lib64/ld-linux-x86-64.so.2 lofsdisk/usr/lib64/
+
+# symbolic links contain just the path, so after chroot they will pick the directories inside lofsdisk
+ln -sf /usr/lib lofsdisk/lib
+ln -sf /usr/lib64 lofsdisk/lib64
+ln -sf /usr/bin lofsdisk/bin
+
+gcc ex2.c -o ex2.out
+cp ex2.out lofsdisk
+
+printf "\nW/ CHROOT\n" > ex2.txt
+sudo chroot lofsdisk /ex2.out >> ex2.txt
+printf "\nW/O CHROOT\n" >> ex2.txt
+./ex2.out >> ex2.txt
diff --git a/week11/ex2.txt b/week11/ex2.txt
new file mode 100644
index 0000000..e603252
--- /dev/null
+++ b/week11/ex2.txt
@@ -0,0 +1,5 @@
+
+W/ CHROOT
+usr lib64 lost+found lib bin file1 file2 ex2.out 
+W/O CHROOT
+tmp var opt home dev run etc bin lost+found lib sys sbin lib64 proc usr mnt root boot srv 
\ No newline at end of file