added files for pcap from Harald's gsmstack

7 files changed, 306 insertions, 17 deletions

diff --git a/src/lib/decoder/gsmstack.c b/src/lib/decoder/gsmstack.c
index ceda6c5..a1f32d8 100644
--- a/src/lib/decoder/gsmstack.c
+++ b/src/lib/decoder/gsmstack.c
@@ -84,17 +84,17 @@ GS_new(GS_CTX *ctx)
 	ctx->fn = -1;
 	ctx->bsic = -1;
 
-//	ctx->tun_fd = mktun("gsm", ctx->ether_addr);
-//	if (ctx->tun_fd < 0)
-//		fprintf(stderr, "cannot open 'gsm' tun device, did you create it?\n");
+	ctx->tun_fd = mktun("gsm", ctx->ether_addr);
+	if (ctx->tun_fd < 0)
+		fprintf(stderr, "cannot open 'gsm' tun device, did you create it?\n");
 
-//	ctx->pcap_fd = open_pcap_file("tvoid.pcap");
-//	if (ctx->pcap_fd < 0)
-//		fprintf(stderr, "cannot open PCAP file: %s\n", strerror(errno));
+	ctx->pcap_fd = open_pcap_file("tvoid.pcap");
+	if (ctx->pcap_fd < 0)
+		fprintf(stderr, "cannot open PCAP file: %s\n", strerror(errno));
 
-//	ctx->burst_pcap_fd = open_pcap_file("tvoid-burst.pcap");
-//	if (ctx->burst_pcap_fd < 0)
-//		fprintf(stderr, "cannot open burst PCAP file: %s\n", strerror(errno));
+	ctx->burst_pcap_fd = open_pcap_file("tvoid-burst.pcap");
+	if (ctx->burst_pcap_fd < 0)
+		fprintf(stderr, "cannot open burst PCAP file: %s\n", strerror(errno));
 
 	return 0;
 }
@@ -118,8 +118,8 @@ GS_process(GS_CTX *ctx, int ts, int type, const unsigned char *src, int fn)
 
 	/* write burst to burst PCAP file */
 	burst_octify(octified, src, USEFUL_BITS);
-//	write_pcap_packet(ctx->burst_pcap_fd, 0 /* arfcn */, ts, ctx->fn,
-//			  1, type, octified, BURST_BYTES);
+	write_pcap_packet(ctx->burst_pcap_fd, 0 /* arfcn */, ts, ctx->fn,
+			  1, type, octified, BURST_BYTES);
 	
 #if 0
 	if (ts != 0) {
@@ -177,9 +177,9 @@ GS_process(GS_CTX *ctx, int ts, int type, const unsigned char *src, int fn)
 		//DEBUGF("OK TS %d, len %d\n", ts, len);
 
 		out_gsmdecode(0, 0, ts, ctx->fn - 4, data, len);
-//		write_interface(ctx->tun_fd, data+1, len-1, ctx->ether_addr);
-//		write_pcap_packet(ctx->pcap_fd, 0 /* arfcn */, ts, ctx->fn,
-//				  0, NORMAL, data, len);
+		write_interface(ctx->tun_fd, data+1, len-1, ctx->ether_addr);
+		write_pcap_packet(ctx->pcap_fd, 0 /* arfcn */, ts, ctx->fn,
+				  0, NORMAL, data, len);
 #if 0
 		if (ctx->fn % 51 != 0) && ( (((ctx->fn % 51 + 5) % 10 == 0) || (((ctx->fn % 51) + 1) % 10 ==0) ) )
 			ready = 1;
@@ -204,4 +204,3 @@ out_gsmdecode(char type, int arfcn, int ts, int fn, char *data, int len)
 	printf("\n");
 	fflush(stdout);
 }
-
diff --git a/src/lib/decoder/gsmstack.h b/src/lib/decoder/gsmstack.h
index 7295b08..9355785 100644
--- a/src/lib/decoder/gsmstack.h
+++ b/src/lib/decoder/gsmstack.h
@@ -29,8 +29,8 @@ typedef struct
 	int tun_fd;
 	unsigned char ether_addr[ETH_ALEN];
 
-//	int pcap_fd;
-//	int burst_pcap_fd;
+	int pcap_fd;
+	int burst_pcap_fd;
 } GS_CTX;
 
 int GS_new(GS_CTX *ctx);
diff --git a/src/lib/decoder/gsmtap.h b/src/lib/decoder/gsmtap.h
new file mode 100644
index 0000000..1022194
--- /dev/null
+++ b/src/lib/decoder/gsmtap.h
@@ -0,0 +1,41 @@
+#ifndef _GSMTAP_H
+#define _GSMTAP_H
+
+/* gsmtap header, pseudo-header in front of the actua GSM payload*/
+
+#include <sys/types.h>
+
+#define GSMTAP_VERSION		0x01
+
+#define GSMTAP_TYPE_UM		0x01
+#define GSMTAP_TYPE_ABIS	0x02
+#define GSMTAP_TYPE_UM_BURST	0x03	/* raw burst bits */
+
+#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
+
+struct gsmtap_hdr {
+	u_int8_t version;		/* version, set to 0x01 currently */
+	u_int8_t hdr_len;		/* length in number of 32bit words */
+	u_int8_t type;			/* see GSMTAP_TYPE_* */
+	u_int8_t timeslot;		/* timeslot (0..7 on Um) */
+
+	u_int16_t arfcn;		/* ARFCN (frequency) */
+	u_int8_t noise_db;		/* noise figure in dB */
+	u_int8_t signal_db;		/* signal level in dB */
+
+	u_int32_t frame_number;		/* GSM Frame Number (FN) */
+
+	u_int8_t burst_type;		/* Type of burst, see above */
+	u_int8_t antenna_nr;		/* Antenna Number */
+	u_int16_t res;			/* reserved for future use (RFU) */
+
+} __attribute__((packed));
+#endif /* _GSMTAP_H */
diff --git a/src/lib/decoder/out_pcap.c b/src/lib/decoder/out_pcap.c
new file mode 100644
index 0000000..4da5fd6
--- /dev/null
+++ b/src/lib/decoder/out_pcap.c
@@ -0,0 +1,111 @@
+/* PCAP support for gsm-tvoid
+ * (C) 2008 by Harald Welte <laforge@gnumonks.org>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <pcap.h>
+#include <errno.h>
+#include <time.h>
+
+#include "out_pcap.h"
+#include "gsmtap.h"
+
+#ifndef LINKTYPE_GSMTAP
+#define LINKTYPE_GSMTAP		2342
+#endif
+
+#define TCPDUMP_MAGIC   0xa1b2c3d4
+
+struct pcap_timeval {
+	int32_t tv_sec;
+	int32_t tv_usec;
+};
+	
+struct pcap_sf_pkthdr {
+	struct pcap_timeval ts;		/* time stamp */
+	u_int32_t caplen;		/* lenght of portion present */
+	u_int32_t len;			/* length of this packet */
+};
+
+static int write_pcap_file_header(int fd)
+{
+	struct pcap_file_header pfh;
+
+	pfh.magic = TCPDUMP_MAGIC;
+	pfh.version_major = PCAP_VERSION_MAJOR;
+	pfh.version_minor = PCAP_VERSION_MINOR;
+	pfh.thiszone = timezone;
+	pfh.sigfigs = 0;
+	pfh.snaplen = 1024; /* FIXME */ 
+	pfh.linktype = LINKTYPE_GSMTAP;
+
+	if (write(fd, &pfh, sizeof(pfh)) < sizeof(pfh))
+		return -1;
+
+	return 0;
+}
+
+/* open pcap file and write header */
+int open_pcap_file(char *fname)
+{
+	int fd;
+	int rc;
+
+ 	fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0660);
+	if (fd < 0)
+		return fd;
+
+	rc = write_pcap_file_header(fd);
+	if (rc < 0) {
+		close(fd);
+		fd = -EIO;
+	}
+
+	return fd;
+}
+
+int write_pcap_packet(int fd, int arfcn, int ts, int fn,
+		      int burst, int burst_type,
+		      const unsigned char *data, unsigned int len)
+{
+	unsigned char buf[8192];
+	struct pcap_sf_pkthdr *ph;
+	struct gsmtap_hdr *gh;
+	struct timeval tv;
+	int rc;
+
+	if (fd < 0)
+		return -EINVAL;
+
+	ph = (struct pcap_sf_pkthdr *) &buf[0];
+	gh = (struct gsmtap_hdr *) &buf[sizeof(struct pcap_sf_pkthdr)];
+
+	gettimeofday(&tv, NULL);
+
+	ph->ts.tv_sec = tv.tv_sec;
+	ph->ts.tv_usec = tv.tv_usec;
+	ph->caplen = ph->len = len + sizeof(struct gsmtap_hdr);
+
+	gh->version = GSMTAP_VERSION;
+	gh->hdr_len = sizeof(struct gsmtap_hdr)>>2;
+	if (burst)
+		gh->type = GSMTAP_TYPE_UM_BURST;
+	else
+		gh->type = GSMTAP_TYPE_UM;
+	gh->timeslot = ts;
+	gh->arfcn = htons(arfcn);
+	/* we don't support signal/noise yet */
+	gh->noise_db = gh->signal_db = 0;
+	gh->frame_number = htonl(fn);
+	gh->burst_type = burst_type & 0xff;
+
+	memcpy(buf + sizeof(*ph) + sizeof(*gh), data, len);
+	
+	rc = write(fd, buf, sizeof(*ph) + sizeof(*gh) + len);
+
+	//fsync(fd);
+
+	return rc;
+}
diff --git a/src/lib/decoder/out_pcap.h b/src/lib/decoder/out_pcap.h
new file mode 100644
index 0000000..5ae5e3c
--- /dev/null
+++ b/src/lib/decoder/out_pcap.h
@@ -0,0 +1,9 @@
+#ifndef _PCAP_IF_H
+#define _PCAP_IF_H
+
+extern int open_pcap_file(char *fname);
+
+int write_pcap_packet(int fd, int arfcn, int ts, int fn,
+		      int burst, int burst_type,
+		      const unsigned char *data, unsigned int len);
+#endif
diff --git a/src/lib/decoder/tun.c b/src/lib/decoder/tun.c
new file mode 100644
index 0000000..2abda90
--- /dev/null
+++ b/src/lib/decoder/tun.c
@@ -0,0 +1,125 @@
+// $Id: tun.cc,v 1.2 2007-07-07 16:31:42 jl Exp $
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <libgen.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/if_tun.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
+#include <arpa/inet.h>
+
+int mktun(const char *chan_name, unsigned char *ether_addr) {
+
+	struct ifreq ifr;
+	// struct ifreq ifw;
+	char if_name[IFNAMSIZ];
+	int fd, one = 1;
+	// int sd;
+
+	// construct TUN interface
+	if((fd = open("/dev/net/tun", O_RDWR)) == -1) {
+		perror("open");
+		return -1;
+	}
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+	snprintf(ifr.ifr_name, IFNAMSIZ, "%s", chan_name);
+	if(ioctl(fd, TUNSETIFF, (void *)&ifr) == -1) {
+		perror("TUNSETIFF");
+		close(fd);
+		return -1;
+	}
+
+	// save actual name
+	memcpy(if_name, ifr.ifr_name, IFNAMSIZ);
+
+	// get ether addr
+	memset(&ifr, 0, sizeof(ifr));
+	memcpy(ifr.ifr_name, if_name, IFNAMSIZ);
+	if(ioctl(fd, SIOCGIFHWADDR, (void *)&ifr) == -1) {
+		perror("SIOCGIFHWADDR");
+		close(fd);
+		return -1;
+	}
+	memcpy(ether_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
+
+	// set persistent
+	if(ioctl(fd, TUNSETPERSIST, (void *)&one) == -1) {
+		perror("TUNSETPERSIST");
+		close(fd);
+		return -1;
+	}
+
+	// set interface up
+	/* XXX must be root
+	if((sd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+		perror("socket");
+		close(fd);
+		return -1;
+	}
+
+	// get current flags
+	memset(&ifr, 0, sizeof(ifr));
+	strncpy(ifr.ifr_name, if_name, IFNAMSIZ - 1);
+	if(ioctl(sd, SIOCGIFFLAGS, &ifr) == -1) {
+		perror("SIOCGIFFLAGS");
+		close(sd);
+		close(fd);
+		return -1;
+	}
+
+	// set up
+	memset(&ifw, 0, sizeof(ifw));
+	strncpy(ifw.ifr_name, if_name, IFNAMSIZ - 1);
+	ifw.ifr_flags = ifr.ifr_flags | IFF_UP | IFF_RUNNING;
+	if(ioctl(sd, SIOCSIFFLAGS, &ifw) == -1) {
+		perror("SIOCSIFFLAGS");
+		close(sd);
+		close(fd);
+		return -1;
+	}
+	close(sd);
+	 */
+
+	return fd;
+}
+
+
+static inline int min(int a, int b) {
+
+	return (a < b)? a : b;
+}
+
+
+static const unsigned int DEFAULT_MTU = 1500;
+static const unsigned short ether_type = 0xfed5; // current dtap ethertype
+
+int write_interface(int fd, unsigned char *data, unsigned int data_len,
+   unsigned char *ether_addr) {
+
+	unsigned char frame[DEFAULT_MTU]; // XXX buffer overflow?
+	struct ethhdr eh;
+
+	if(fd < 0)
+		return data_len;
+
+	memcpy(eh.h_dest, ether_addr, ETH_ALEN);
+	memcpy(eh.h_source, ether_addr, ETH_ALEN);
+	eh.h_proto = htons(ether_type);
+
+	memcpy(frame, &eh, sizeof(eh));
+	memcpy(frame + sizeof(eh), data,
+	   min(data_len, sizeof(frame) - sizeof(eh)));
+
+	if(write(fd, frame, sizeof(eh) + data_len) == -1) {
+		perror("write");
+		return -1;
+	}
+
+	return data_len;
+}
diff --git a/src/lib/decoder/tun.h b/src/lib/decoder/tun.h
new file mode 100644
index 0000000..a7868c4
--- /dev/null
+++ b/src/lib/decoder/tun.h
@@ -0,0 +1,4 @@
+// $Id: tun.h,v 1.1.1.1 2007-06-01 04:26:57 jl Exp $
+
+int mktun(const char *, unsigned char *);
+int write_interface(int, unsigned char *, unsigned int, unsigned char *);