Initial import

6 files changed, 625 insertions, 0 deletions

diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..7a8e8ab
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+These restrictions translate to certain responsibilities for you if you
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+
+  For example, if you distribute copies of such a program, whether
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+
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+
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+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+Activities other than copying, distribution and modification are not
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+You may charge a fee for the physical act of transferring a copy, and
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+    c) If the modified program normally reads commands interactively
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+
+These requirements apply to the modified work as a whole.  If
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+
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+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
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+
+It is not the purpose of this section to induce you to infringe any
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+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
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+countries not thus excluded.  In such case, this License incorporates
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+
+  9. The Free Software Foundation may publish revised and/or new versions
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+be similar in spirit to the present version, but may differ in detail to
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+
+Each version is given a distinguishing version number.  If the Program
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+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
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+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
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+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
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+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
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+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/README b/README
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/README
diff --git a/src/.gitignore b/src/.gitignore
new file mode 100644
index 0000000..d0f305d
--- /dev/null
+++ b/src/.gitignore
@@ -0,0 +1,3 @@
+*.o
+ot290-gsmtap
+
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..b5f871f
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,13 @@
+CFLAGS=-Wall #-Werror
+
+all: ot290-gsmtap
+
+ot290-gsmtap: main.o
+	$(CC) $(LDFLAGS) -o $@ $^
+
+%.o: %.c
+	$(CC) $(CFLAGS) -o $@ -c $^
+
+clean:
+	@rm -f ot290-gsmtap *.o
+
diff --git a/src/gsmtap.h b/src/gsmtap.h
new file mode 100644
index 0000000..3f384a4
--- /dev/null
+++ b/src/gsmtap.h
@@ -0,0 +1,73 @@
+#ifndef _GSMTAP_H
+#define _GSMTAP_H
+
+/* gsmtap header, pseudo-header in front of the actua GSM payload */
+
+/* GSMTAP is a generic header format for GSM protocol captures,
+ * it uses the IANA-assigned UDP port number 4729 and carries
+ * payload in various formats of GSM interfaces such as Um MAC
+ * blocks or Um bursts.
+ *
+ * Example programs generating GSMTAP data are airprobe
+ * (http://airprobe.org/) or OsmocomBB (http://bb.osmocom.org/)
+ */
+
+#include <stdint.h>
+
+#define GSMTAP_VERSION		0x02
+
+#define GSMTAP_TYPE_UM		0x01
+#define GSMTAP_TYPE_ABIS	0x02
+#define GSMTAP_TYPE_UM_BURST	0x03	/* raw burst bits */
+#define GSMTAP_TYPE_SIM		0x04
+
+#define GSMTAP_BURST_UNKNOWN		0x00
+#define GSMTAP_BURST_FCCH		0x01
+#define GSMTAP_BURST_PARTIAL_SCH	0x02
+#define GSMTAP_BURST_SCH		0x03
+#define GSMTAP_BURST_CTS_SCH		0x04
+#define GSMTAP_BURST_COMPACT_SCH	0x05
+#define GSMTAP_BURST_NORMAL		0x06
+#define GSMTAP_BURST_DUMMY		0x07
+#define GSMTAP_BURST_ACCESS		0x08
+#define GSMTAP_BURST_NONE		0x09
+
+#define GSMTAP_CHANNEL_UNKNOWN	0x00
+#define GSMTAP_CHANNEL_BCCH	0x01
+#define GSMTAP_CHANNEL_CCCH	0x02
+#define GSMTAP_CHANNEL_RACH	0x03
+#define GSMTAP_CHANNEL_AGCH	0x04
+#define GSMTAP_CHANNEL_PCH	0x05
+#define GSMTAP_CHANNEL_SDCCH	0x06
+#define GSMTAP_CHANNEL_SDCCH4	0x07
+#define GSMTAP_CHANNEL_SDCCH8	0x08
+#define GSMTAP_CHANNEL_TCH_F	0x09
+#define GSMTAP_CHANNEL_TCH_H	0x0a
+#define GSMTAP_CHANNEL_ACCH	0x80
+
+#define GSMTAP_ARFCN_F_PCS	0x8000
+#define GSMTAP_ARFCN_F_UPLINK	0x4000
+#define GSMTAP_ARFCN_MASK	0x3fff
+
+#define GSMTAP_UDP_PORT			4729
+
+struct gsmtap_hdr {
+	uint8_t version;	/* version, set to 0x01 currently */
+	uint8_t hdr_len;	/* length in number of 32bit words */
+	uint8_t type;		/* see GSMTAP_TYPE_* */
+	uint8_t timeslot;	/* timeslot (0..7 on Um) */
+
+	uint16_t arfcn;		/* ARFCN (frequency) */
+	int8_t signal_dbm;	/* signal level in dBm */
+	int8_t snr_db;		/* signal/noise ratio in dB */
+
+	uint32_t frame_number;	/* GSM Frame Number (FN) */
+
+	uint8_t sub_type;	/* Type of burst/channel, see above */
+	uint8_t antenna_nr;	/* Antenna Number */
+	uint8_t sub_slot;	/* sub-slot within timeslot */
+	uint8_t res;		/* reserved for future use (RFU) */
+
+} __attribute__((packed));
+
+#endif /* _GSMTAP_H */
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..cbf1bdc
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,196 @@
+/* (C) 2012 by Thomas Bertani <mail@thomasbertani.it>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <sys/file.h>
+#include <termios.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+//#include <sys/ioctl.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "gsmtap.h"
+
+
+static volatile int run = 1;
+static int gsmtap_fd, serial_fd;
+
+struct frame
+{
+    unsigned char AppID, FCS, AppMsg[8192];
+    unsigned short AppMsgLength;
+};
+
+static void interrupt(int sign){ run = 0; }
+
+static int serial_init(const char *serial_port)
+{
+    struct termios t;
+    serial_fd = open(serial_port, O_RDWR | O_NOCTTY | O_NONBLOCK);
+    if (serial_fd < 0)
+    {
+        char errstr[50];
+        sprintf(errstr, "Failed to open serial port %s", serial_port);
+        perror(errstr);
+        return -1;
+    }
+    t.c_cflag = CBAUD | B115200 | CRTSCTS | CS8 | CREAD | CLOCAL;
+    t.c_cc[VMIN] = 255;
+    t.c_cc[VTIME] = 0;
+    tcsetattr(serial_fd, TCSAFLUSH, &t);
+    return 0;
+}
+
+static int serial_read(void *buf, size_t nbytes)
+{
+    fd_set readfds;
+    int actual;
+    FD_ZERO(&readfds);
+    FD_SET(serial_fd, &readfds);
+    actual = select(serial_fd+1, &readfds, NULL, NULL, NULL);
+    if(actual > 0)
+    {
+        actual = read(serial_fd, buf, nbytes);
+        if( actual == 0 )
+        {
+            run = 0;
+            return -1;
+        }
+    }
+    if((actual == -1) && (errno != EINTR))
+    {
+        perror("serial_read");
+        run = 0;
+    }
+    return actual;
+}
+
+static void gsmtap_open(const char *gsmtap_host)
+{
+    struct sockaddr_in sin;
+    sin.sin_family= AF_INET;
+    sin.sin_port = htons(GSMTAP_UDP_PORT);
+    if (inet_aton(gsmtap_host, &sin.sin_addr) < 0) perror("parsing GSMTAP destination address");
+    gsmtap_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+    if (gsmtap_fd < 0) perror("GSMTAP socket initialization");
+    if (connect(gsmtap_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) perror("connecting GSMTAP socket");
+}
+
+void testgsmtap(unsigned char *AppMsg, unsigned short AppMsgLength)
+{
+    int length = 0;
+    if ((AppMsg[0] == 0x03) && ((AppMsg[1] == 0x03) || (AppMsg[1] == 0x00))) //L2/L3
+    {
+        int format = (AppMsg[2] >> 1 & 0b1111);
+        length = AppMsg[3] << 8 | AppMsg[4];
+        int i = 0;
+        printf("* L%d format:%d, Length:%d, FreqBit:%d, U/D: %d, LayerMessageFrame: [", (AppMsg[1] == 0x00) ? 3 : 2, format, length, AppMsg[2] >> 5, (AppMsg[2] & 1));
+        for (i=0; i<length; i++) printf("%d, ", AppMsg[5+i]);
+        printf("\b\b]\n");
+    }
+}
+
+void req(unsigned char *msg, int length)
+{
+    int sent = 0;
+    do
+    {
+        int ret = write(serial_fd, msg, length - sent);
+        if (ret < 0)
+        {
+            if (errno == EAGAIN)
+            {
+                usleep(1000);
+                continue;
+            }
+            break;
+        }
+        sent += ret;
+        msg += ret;
+    } while (sent < length);
+    if (sent != length) perror("Something went wrong while sending");
+    printf("Sent %dB frame!\n", length);
+}
+
+int main(int argc, char **argv)
+{
+    struct stats { int packets, totalErrors, checksumErrors; } s;
+    struct frame f;
+    unsigned char actual, buf[3], fcs;
+    unsigned short i;
+    if (serial_init(argv[1]) < 0) return -1;
+    gsmtap_open(argv[2]);
+    printf("Press Ctrl+C to interrupt...\n");
+    signal(SIGINT, interrupt);
+    
+    unsigned char myreq[] = {2, 0, 0, 2, 65, 0, 67, 3}; //MobileInformationMessage-ProductName request 
+    req(myreq, sizeof(myreq));
+    unsigned char myreq2[] = {2, 0, 0, 6, 0, 31, 0, 0, 0, 9, 16, 3}; //LayerMessage-EnableL2L3Trace request
+    req(myreq2, sizeof(myreq2));
+    
+    while (run)
+    {
+        if ((serial_read(buf, 1) == 1) && (buf[0] == 0x02))
+        {
+            s.packets++;
+            serial_read(buf, 3);
+            f.AppID = buf[0];
+            f.AppMsgLength = ((buf[1] & 0x1F) << 8) | buf[2];
+            fcs = f.AppID ^ buf[1] ^ buf[2];
+            if (f.AppMsgLength > 255) //FIXME: not yet implemented, actually we don't need it at all
+            {
+                s.packets--;
+                continue;
+            }
+            if (f.AppID != 0x00) continue; // we are just interested in parsing AppID == 0x00 (OTR) packets
+            serial_read(f.AppMsg, f.AppMsgLength);
+            for (i = 0; i < f.AppMsgLength; i++) fcs ^= f.AppMsg[i];
+            actual = serial_read(buf, 2);
+            if ((actual != 2) || (buf[1] != 0x03))
+            {
+                printf("(ERROR: ETX expected, got %d instead)\n", buf[1]);
+                s.totalErrors++;
+                continue;
+            }
+            printf("(OK %dB)", f.AppMsgLength);
+            f.FCS = buf[0];
+            if (fcs != f.FCS)
+            {
+                printf(" ~ WRONG CHECKSUM!!\n");
+                s.totalErrors++; s.checksumErrors++;
+                continue;
+            }
+            printf(" ~ AppMsg: [");
+            for (i = 0; i < f.AppMsgLength; i++) printf("%d ", f.AppMsg[i]);
+            printf("\b]\n");
+            /*printf("\b, asString: [");
+            for (i = 0; i < f.AppMsgLength; i++) printf("%c ", (char)f.AppMsg[i]);
+            printf("\b]\n");*/
+            testgsmtap(f.AppMsg, f.AppMsgLength);
+        }
+    }
+    printf("[*] Checksum errors: %d/%d | Total errors: %d/%d\n", s.checksumErrors, s.packets, s.totalErrors, s.packets);
+    return 0;
+}