From a9b0934412cd218befd3bea06ad4f2b49081f37b Mon Sep 17 00:00:00 2001 From: Thomas Bertani Date: Sat, 18 Aug 2012 18:30:29 +0200 Subject: [PATCH] Initial import --- COPYING | 340 +++++++++++++++++++++++++++++++++++++++++++++++++ README | 0 src/.gitignore | 3 + src/Makefile | 13 ++ src/gsmtap.h | 73 +++++++++++ src/main.c | 196 ++++++++++++++++++++++++++++ 6 files changed, 625 insertions(+) create mode 100644 COPYING create mode 100644 README create mode 100644 src/.gitignore create mode 100644 src/Makefile create mode 100644 src/gsmtap.h create mode 100644 src/main.c 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. 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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. + + , 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 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 + +#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 + * + * 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 +#include +#include +#include +#include +#include +#include +#include +//#include + +#include +#include +#include +#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 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; +}