libtinytac: adding initial network functions

3 files changed, 206 insertions, 0 deletions

diff --git a/lib/libtinytac/libtinytac.sym b/lib/libtinytac/libtinytac.sym
index 206db9d..16ddb84 100644
--- a/lib/libtinytac/libtinytac.sym
+++ b/lib/libtinytac/libtinytac.sym
@@ -34,6 +34,10 @@
 tinytac_free
 tinytac_initialize
 #
+# network functions
+tinytac_recv
+tinytac_send
+#
 # protocol functions
 tinytac_pckt_md5pad
 tinytac_pckt_obfuscate
diff --git a/lib/libtinytac/lnetwork.c b/lib/libtinytac/lnetwork.c
new file mode 100644
index 0000000..5b4ea63
--- /dev/null
+++ b/lib/libtinytac/lnetwork.c
@@ -0,0 +1,141 @@
+/*
+ *  Tiny TACACS+ Client Library
+ *  Copyright (C) 2022 David M. Syzdek <david@syzdek.net>.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are
+ *  met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of David M. Syzdek nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 DAVID M. SYZDEK 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.
+ */
+#define _LIB_LIBTINYTAC_LNETWORK_C 1
+#include "lnetwork.h"
+
+
+///////////////
+//           //
+//  Headers  //
+//           //
+///////////////
+#pragma mark - Headers
+
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+
+///////////////////
+//               //
+//  Definitions  //
+//               //
+///////////////////
+#pragma mark - Definitions
+
+
+//////////////////
+//              //
+//  Prototypes  //
+//              //
+//////////////////
+#pragma mark - Prototypes
+
+int
+tinytac_recv(
+         int                           s,
+         char *                        key,
+         tinytac_pckt_t **             pcktp )
+{
+   size_t               pckt_len;
+   ssize_t              rc;
+   tinytac_pckt_t *     pckt;
+   void *               ptr;
+
+   pckt_len = sizeof(tinytac_pckt_t);
+
+   if ((pckt = malloc(pckt_len)) == NULL)
+      return(-1);
+
+   if ((rc = recv(s, pckt, pckt_len, 0)) == -1)
+   {
+      free(pckt);
+      return(-1);
+   };
+   if (((size_t)rc) != pckt_len)
+   {
+      free(pckt);
+      errno = EBADMSG;
+      return(-1);
+   };
+
+   pckt_len = ntohl(pckt->pckt_length) + sizeof(tinytac_pckt_t);
+   if ((ptr = realloc(pckt, pckt_len)) == NULL)
+   {
+      free(pckt);
+      return(-1);
+   };
+   pckt = ptr;
+
+   if ((rc = recv(s, pckt->pckt_body, ntohl(pckt->pckt_length), 0)) == -1)
+   {
+      free(pckt);
+      return(-1);
+   };
+   if (((size_t)rc) != ntohl(pckt->pckt_length))
+   {
+      free(pckt);
+      errno = EBADMSG;
+      return(-1);
+   };
+
+   tinytac_pckt_obfuscate(pckt, key, strlen(key), TTAC_NO);
+
+   *pcktp = pckt;
+
+   return(0);
+}
+
+
+int
+tinytac_send(
+         int                           s,
+         char *                        key,
+         tinytac_pckt_t *              pckt )
+{
+   size_t   pckt_len;
+   ssize_t  rc;
+   tinytac_pckt_obfuscate(pckt, key, strlen(key), TTAC_YES);
+   pckt_len = ntohl(pckt->pckt_length) + sizeof(tinytac_pckt_t);
+   if ((rc = send(s, pckt, pckt_len, 0)) == -1)
+      return(-1);
+   if (((size_t)rc) != pckt_len)
+   {
+      errno = EBADMSG;
+      return(-1);
+   };
+   return(0);
+}
+
+
+/* end of source */
diff --git a/lib/libtinytac/lnetwork.h b/lib/libtinytac/lnetwork.h
new file mode 100644
index 0000000..0937556
--- /dev/null
+++ b/lib/libtinytac/lnetwork.h
@@ -0,0 +1,61 @@
+/*
+ *  Tiny TACACS+ Client Library
+ *  Copyright (C) 2022 David M. Syzdek <david@syzdek.net>.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are
+ *  met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of David M. Syzdek nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 DAVID M. SYZDEK 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.
+ */
+#ifndef _LIB_LIBTINYTAC_LNETWORK_H
+#define _LIB_LIBTINYTAC_LNETWORK_H 1
+
+
+///////////////
+//           //
+//  Headers  //
+//           //
+///////////////
+#pragma mark - Headers
+
+#include "libtinytac.h"
+
+
+///////////////////
+//               //
+//  Definitions  //
+//               //
+///////////////////
+#pragma mark - Definitions
+
+
+//////////////////
+//              //
+//  Prototypes  //
+//              //
+//////////////////
+#pragma mark - Prototypes
+
+
+#endif /* end of header */