1 files changed, 190 insertions, 0 deletions
diff --git a/ncat/sys_wrap.c b/ncat/sys_wrap.c
new file mode 100644
index 0000000..9c742c1
--- /dev/null
+++ b/ncat/sys_wrap.c
@@ -0,0 +1,190 @@
+/***************************************************************************
+ * sys_wrap.c -- Error-checked wrappers around common functions.           *
+ ***********************IMPORTANT NMAP LICENSE TERMS************************
+ *
+ * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
+ * Project"). Nmap is also a registered trademark of the Nmap Project.
+ *
+ * This program is distributed under the terms of the Nmap Public Source
+ * License (NPSL). The exact license text applying to a particular Nmap
+ * release or source code control revision is contained in the LICENSE
+ * file distributed with that version of Nmap or source code control
+ * revision. More Nmap copyright/legal information is available from
+ * https://nmap.org/book/man-legal.html, and further information on the
+ * NPSL license itself can be found at https://nmap.org/npsl/ . This
+ * header summarizes some key points from the Nmap license, but is no
+ * substitute for the actual license text.
+ *
+ * Nmap is generally free for end users to download and use themselves,
+ * including commercial use. It is available from https://nmap.org.
+ *
+ * The Nmap license generally prohibits companies from using and
+ * redistributing Nmap in commercial products, but we sell a special Nmap
+ * OEM Edition with a more permissive license and special features for
+ * this purpose. See https://nmap.org/oem/
+ *
+ * If you have received a written Nmap license agreement or contract
+ * stating terms other than these (such as an Nmap OEM license), you may
+ * choose to use and redistribute Nmap under those terms instead.
+ *
+ * The official Nmap Windows builds include the Npcap software
+ * (https://npcap.com) for packet capture and transmission. It is under
+ * separate license terms which forbid redistribution without special
+ * permission. So the official Nmap Windows builds may not be redistributed
+ * without special permission (such as an Nmap OEM license).
+ *
+ * Source is provided to this software because we believe users have a
+ * right to know exactly what a program is going to do before they run it.
+ * This also allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to submit your changes as a Github PR
+ * or by email to the dev@nmap.org mailing list for possible incorporation into
+ * the main distribution. Unless you specify otherwise, it is understood that
+ * you are offering us very broad rights to use your submissions as described in
+ * the Nmap Public Source License Contributor Agreement. This is important
+ * because we fund the project by selling licenses with various terms, and also
+ * because the inability to relicense code has caused devastating problems for
+ * other Free Software projects (such as KDE and NASM).
+ *
+ * The free version of Nmap is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
+ * indemnification and commercial support are all available through the
+ * Npcap OEM program--see https://nmap.org/oem/
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include <limits.h>
+
+#include "sys_wrap.h"
+#include "util.h"
+
+void *Calloc(size_t nmemb, size_t size)
+{
+    void *ret;
+
+    /* older libcs don't check for int overflow */
+    smul(nmemb, size);
+
+    ret = calloc(nmemb, size);
+    if (ret == NULL)
+        die("calloc");
+
+    return ret;
+}
+
+int Close(int fd)
+{
+    if (close(fd) < 0)
+        die("close");
+
+    return 0;
+}
+
+int Connect(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen)
+{
+    if (connect(sockfd, serv_addr, addrlen) < 0)
+        die("connect");
+
+    return 0;
+}
+
+int Dup2(int oldfd, int newfd)
+{
+    int ret;
+
+    ret = dup2(oldfd, newfd);
+    if (ret < 0)
+        die("dup2");
+
+    return ret;
+}
+
+int Listen(int s, int backlog)
+{
+    if (listen(s, backlog) < 0)
+        die("listen");
+
+    return 0;
+}
+
+int Open(const char *pathname, int flags, mode_t mode)
+{
+    int ret;
+
+    ret = open(pathname, flags, mode);
+    if (ret < 0)
+        die("open");
+
+    return ret;
+}
+
+ssize_t Read(int fd, void *buf, size_t count)
+{
+    ssize_t ret;
+
+    ret = read(fd, buf, count);
+    if (ret < 0)
+        die("read");
+
+    return ret;
+}
+
+int Setsockopt(int s, int level, int optname, const void *optval,
+                    socklen_t optlen)
+{
+    int ret;
+
+    ret = setsockopt(s, level, optname, (const char *) optval, optlen);
+    if (ret < 0)
+        die("setsockopt");
+
+    return ret;
+}
+
+sighandler_t Signal(int signum, sighandler_t handler)
+{
+    sighandler_t ret;
+
+    ret = signal(signum, handler);
+    if (ret == SIG_ERR)
+        die("signal");
+
+    return ret;
+}
+
+
+int Socket(int domain, int type, int protocol)
+{
+    int ret;
+
+    ret = socket(domain, type, protocol);
+    if (ret < 0)
+        die("socket");
+
+    return ret;
+}
+
+char *Strdup(const char *s)
+{
+    char *ret;
+
+    ret = strdup(s);
+    if (ret == NULL)
+        die("strdup");
+
+    return ret;
+}
+
+ssize_t Write(int fd, const void *buf, size_t count)
+{
+    ssize_t ret = write(fd, buf, count);
+
+    if (ret < 0)         /* we don't bail if < count bytes written */
+        die("write");
+
+    return ret;
+}