POTD skeleton #22.

Signed-off-by: lns <matzeton@googlemail.com>

3 files changed, 55 insertions, 1 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index b26f216..f6c7a20 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,4 +2,4 @@ AM_CFLAGS = -pedantic -Wall -std=gnu99 -fstrict-aliasing -D_GNU_SOURCE=1 $(libss
 AM_LDFLAGS = $(libssh_LIBS)
 
 sbin_PROGRAMS = potd
-potd_SOURCES = utils.c log.c log_colored.c socket.c forward.c server.c server_ssh.c main.c
+potd_SOURCES = utils.c log.c log_colored.c socket.c jail.c forward.c server.c server_ssh.c main.c
diff --git a/src/jail.c b/src/jail.c
new file mode 100644
index 0000000..cd8189a
--- /dev/null
+++ b/src/jail.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "jail.h"
+
+
+int jail_init(jail_ctx **ctx, size_t stacksize)
+{
+    assert(ctx);
+    if (stacksize > BUFSIZ)
+        stacksize = BUFSIZ;
+    if (!*ctx)
+        *ctx = calloc(1, sizeof(**ctx));
+    assert(*ctx);
+
+    (*ctx)->stacksize = stacksize;
+    (*ctx)->stack_ptr =
+        (unsigned char *) calloc(1, (*ctx)->stacksize)
+            + (*ctx)->stacksize;
+
+    return 0;
+}
+
+void jail_free(jail_ctx **ctx)
+{
+}
+
+int jail_fork(jail_ctx *ctx)
+{
+    return 0;
+}
diff --git a/src/jail.h b/src/jail.h
new file mode 100644
index 0000000..dc6bfdf
--- /dev/null
+++ b/src/jail.h
@@ -0,0 +1,22 @@
+#ifndef POTD_JAIL_H
+#define POTD_JAIL_H 1
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#define MAX_STACKSIZE BUFSIZ
+
+typedef struct jail_ctx {
+    pid_t jail_pid;
+    size_t stacksize;
+    void *stack_ptr;
+} jail_ctx;
+
+
+int jail_init(jail_ctx **ctx, size_t stacksize);
+
+void jail_free(jail_ctx **ctx);
+
+int jail_fork(jail_ctx *ctx);
+
+#endif