+/*
+ * pcap-septel.c: Packet capture interface for Intel/Septel card.
+ *
+ * The functionality of this code attempts to mimic that of pcap-linux as much
+ * as possible. This code is compiled in several different ways depending on
+ * whether SEPTEL_ONLY and HAVE_SEPTEL_API are defined. If HAVE_SEPTEL_API is
+ * not defined it should not get compiled in, otherwise if SEPTEL_ONLY is
+ * defined then the 'septel_' function calls are renamed to 'pcap_'
+ * equivalents. If SEPTEL_ONLY is not defined then nothing is altered - the
+ * septel_ functions will be called as required from their
+ * pcap-linux/equivalents.
+ *
+ * (+961 3 485243)
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/libpcap/pcap-septel.c,v 1.1.2.1 2005-06-20 21:30:18 guy Exp $";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/param.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "pcap-int.h"
+
+#include <ctype.h>
+#include <netinet/in.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#ifdef HAVE_SEPTEL_API
+#include <msg.h>
+#include <ss7_inc.h>
+#include <sysgct.h>
+#include <pack.h>
+#include <system.h>
+#endif /* HAVE_SEPTEL_API */
+
+#ifdef SEPTEL_ONLY
+/* This code is required when compiling for a DAG device only. */
+#include "pcap-septel.h"
+
+/* Replace dag function names with pcap equivalent. */
+#define septel_open_live pcap_open_live
+#define septel_platform_finddevs pcap_platform_finddevs
+#endif /* SEPTEL_ONLY */
+
+static int septel_setfilter(pcap_t *p, struct bpf_program *fp);
+static int septel_stats(pcap_t *p, struct pcap_stat *ps);
+static int septel_set_datalink(pcap_t *p, int dlt);
+static int septel_get_datalink(pcap_t *p);
+static int septel_setnonblock(pcap_t *p, int nonblock, char *errbuf);
+
+static void septel_platform_close(pcap_t *p) {
+
+}
+
+
+
+/*
+ * Read at most max_packets from the capture queue and call the callback
+ * for each of them. Returns the number of packets handled, -1 if an
+ * error occured, or -2 if we were told to break out of the loop.
+ */
+static int septel_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) {
+
+ HDR *h;
+ MSG *m;
+ int processed = 0 ;
+ int t = 0 ;
+
+ /* identifier for the message queue of the module(upe) from which we are capturing
+ * packets.These IDs are defined in system.txt . By default it is set to 0x2d
+ * so change it to 0xdd for technical reason and therefore the module id for upe becomes:
+ * LOCAL 0xdd * upe - Example user part task */
+ unsigned int id = 0xdd;
+
+ /* process the packets */
+ do {
+
+ unsigned short packet_len = 0;
+ int caplen = 0;
+ int counter = 0;
+ struct pcap_pkthdr pcap_header;
+
+ u_char *dp ;
+ dp = malloc(320); /* 320 = size of param area */
+
+ /*
+ * Has "pcap_breakloop()" been called?
+ */
+ loop:
+ if (p->break_loop) {
+ /*
+ * Yes - clear the flag that indicates that
+ * it has, and return -2 to indicate that
+ * we were told to break out of the loop.
+ */
+ p->break_loop = 0;
+ return -2;
+ }
+
+ /*repeat until a packet is read
+ *a NULL message means :
+ * when no packet is in queue or all packets in queue already read */
+ do {
+ /* receive packet in non-blocking mode
+ * GCT_grab is defined in the septel library software */
+ h = GCT_grab(id);
+
+ m = (MSG*)h;
+ /* a couter is added here to avoid an infinite loop
+ * that will cause our capture program GUI to freeze while waiting for a packet*/
+ counter++ ;
+
+ }
+ while ((m == NULL)&& (counter< 100)) ;
+
+ if (m != NULL) {
+
+ t = h->type ;
+
+ /* catch only messages with type = 0xcf00 or 0x8f01 corrsponding to ss7 messages*/
+ if ((t != 0xcf00) && (t != 0x8f01)) {
+ relm(h);
+ goto loop ;
+ }
+
+
+ dp = get_param(m);/* get pointer to MSG parameter area (m->param) */
+ packet_len = m->len;
+ caplen = p->snapshot ;
+
+
+ if (caplen > packet_len) {
+
+ caplen = packet_len;
+ }
+ /* Run the packet filter if there is one. */
+ if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
+
+
+ /* get a time stamp , consisting of :
+ *
+ * pcap_header.ts.tv_sec:
+ * ----------------------
+ * a UNIX format time-in-seconds when he packet was captured,
+ * i.e. the number of seconds since Epoch time (January 1,1970, 00:00:00 GMT)
+ *
+ * pcap_header.ts.tv_usec :
+ * ------------------------
+ * the number of microseconds since that second
+ * when the packet was captured
+ */
+
+ (void)gettimeofday(&pcap_header.ts, NULL);
+
+ /* Fill in our own header data */
+ pcap_header.caplen = caplen;
+ pcap_header.len = packet_len;
+
+ /* Count the packet. */
+ p->md.stat.ps_recv++;
+
+ /* Call the user supplied callback function */
+ callback(user, &pcap_header, dp);
+
+ processed++ ;
+
+ }
+ /* after being processed the packet must be
+ *released in order to receive another one */
+ relm(h);
+ }else
+ processed++;
+
+ }
+
+ while (processed < cnt ) ;
+
+ return processed ;
+}
+
+/*
+ * Get a handle for a live capture from the given Septel device. Always pass a NULL device
+ * The promisc flag is ignored because Septel cards have built-in tracing.
+ * The to_ms parameter is also ignored as it is
+ * not supported in hardware.
+ *
+ * See also pcap(3).
+ */
+pcap_t *septel_open_live(const char *device, int snaplen, int promisc, int to_ms, char *ebuf) {
+ pcap_t *handle;
+
+ handle = malloc(sizeof(*handle));
+ if (handle == NULL) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc %s: %s", device, pcap_strerror(errno));
+ return NULL;
+ }
+
+ /* Initialize some components of the pcap structure. */
+
+ memset(handle, 0, sizeof(*handle));
+
+ handle->snapshot = snaplen;
+
+ if ((handle->linktype = septel_get_datalink(handle)) < 0) {
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "septel_get_linktype %s: unknown linktype\n", device);
+ goto fail;
+ }
+
+ handle->bufsize = 0;
+
+
+ /*
+ * "select()" and "poll()" don't work on Septel queues
+ */
+ handle->selectable_fd = -1;
+
+ handle->read_op = septel_read;
+ handle->setfilter_op = septel_setfilter;
+ handle->set_datalink_op = septel_set_datalink;
+ handle->getnonblock_op = pcap_getnonblock_fd;
+ handle->setnonblock_op = septel_setnonblock;
+ handle->stats_op = septel_stats;
+ handle->close_op = septel_platform_close;
+
+ return handle;
+
+fail:
+ if (handle != NULL) {
+ free(handle);
+ }
+
+ return NULL;
+}
+
+static int septel_stats(pcap_t *p, struct pcap_stat *ps) {
+ /*p->md.stat.ps_recv = 0;*/
+ /*p->md.stat.ps_drop = 0;*/
+
+ *ps = p->md.stat;
+
+ return 0;
+}
+
+
+int
+septel_platform_finddevs(pcap_if_t **devlistp, char *errbuf)
+{
+unsigned char *p;
+ const char description[512]= "Intel/Septel device";
+ char name[512]="septel" ;
+ int ret = 0;
+ pcap_add_if(devlistp,name,0,description,errbuf);
+
+ return (ret);
+}
+
+
+/*
+ * Installs the given bpf filter program in the given pcap structure. There is
+ * no attempt to store the filter in kernel memory as that is not supported
+ * with SEPTEL cards.
+ */
+static int septel_setfilter(pcap_t *p, struct bpf_program *fp) {
+if (!p)
+ return -1;
+ if (!fp) {
+ strncpy(p->errbuf, "setfilter: No filter specified",
+ sizeof(p->errbuf));
+ return -1;
+ }
+
+ /* Make our private copy of the filter */
+
+ if (install_bpf_program(p, fp) < 0) {
+ snprintf(p->errbuf, sizeof(p->errbuf),
+ "malloc: %s", pcap_strerror(errno));
+ return -1;
+ }
+
+ p->md.use_bpf = 0;
+
+
+
+ return (0);
+}
+
+
+static int
+septel_set_datalink(pcap_t *p, int dlt)
+{
+ return (0);
+}
+
+static int
+septel_setnonblock(pcap_t *p, int nonblock, char *errbuf)
+{
+ return (0);
+}
+
+static int
+septel_get_datalink(pcap_t *p)
+{
+ int linktype = -1;
+ return DLT_MTP2;
+}
projects / libpcap / commitdiff
