294 lines
7.5 KiB
C
294 lines
7.5 KiB
C
/*
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* pcap-septel.c: Packet capture interface for Intel/Septel card.
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*
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* The functionality of this code attempts to mimic that of pcap-linux as much
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* as possible. This code is compiled in several different ways depending on
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* whether SEPTEL_ONLY and HAVE_SEPTEL_API are defined. If HAVE_SEPTEL_API is
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* not defined it should not get compiled in, otherwise if SEPTEL_ONLY is
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* defined then the 'septel_' function calls are renamed to 'pcap_'
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* equivalents. If SEPTEL_ONLY is not defined then nothing is altered - the
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* septel_ functions will be called as required from their
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* pcap-linux/equivalents.
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*
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* Authors: Gilbert HOYEK (gil_hoyek@hotmail.com), Elias M. KHOURY
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* (+961 3 485243)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "pcap-int.h"
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#include <ctype.h>
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#include <netinet/in.h>
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <msg.h>
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#include <ss7_inc.h>
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#include <sysgct.h>
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#include <pack.h>
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#include <system.h>
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#include "pcap-septel.h"
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static int septel_setfilter(pcap_t *p, struct bpf_program *fp);
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static int septel_stats(pcap_t *p, struct pcap_stat *ps);
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static int septel_setnonblock(pcap_t *p, int nonblock, char *errbuf);
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/*
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* Private data for capturing on Septel devices.
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*/
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struct pcap_septel {
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struct pcap_stat stat;
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}
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/*
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* Read at most max_packets from the capture queue and call the callback
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* for each of them. Returns the number of packets handled, -1 if an
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* error occured, or -2 if we were told to break out of the loop.
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*/
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static int septel_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) {
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struct pcap_septel *ps = p->priv;
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HDR *h;
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MSG *m;
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int processed = 0 ;
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int t = 0 ;
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/* identifier for the message queue of the module(upe) from which we are capturing
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* packets.These IDs are defined in system.txt . By default it is set to 0x2d
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* so change it to 0xdd for technical reason and therefore the module id for upe becomes:
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* LOCAL 0xdd * upe - Example user part task */
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unsigned int id = 0xdd;
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/* process the packets */
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do {
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unsigned short packet_len = 0;
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int caplen = 0;
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int counter = 0;
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struct pcap_pkthdr pcap_header;
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u_char *dp ;
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/*
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* Has "pcap_breakloop()" been called?
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*/
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loop:
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if (p->break_loop) {
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/*
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* Yes - clear the flag that indicates that
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* it has, and return -2 to indicate that
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* we were told to break out of the loop.
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*/
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p->break_loop = 0;
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return -2;
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}
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/*repeat until a packet is read
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*a NULL message means :
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* when no packet is in queue or all packets in queue already read */
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do {
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/* receive packet in non-blocking mode
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* GCT_grab is defined in the septel library software */
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h = GCT_grab(id);
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m = (MSG*)h;
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/* a couter is added here to avoid an infinite loop
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* that will cause our capture program GUI to freeze while waiting
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* for a packet*/
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counter++ ;
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}
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while ((m == NULL)&& (counter< 100)) ;
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if (m != NULL) {
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t = h->type ;
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/* catch only messages with type = 0xcf00 or 0x8f01 corrsponding to ss7 messages*/
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/* XXX = why not use API_MSG_TX_REQ for 0xcf00 and API_MSG_RX_IND
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* for 0x8f01? */
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if ((t != 0xcf00) && (t != 0x8f01)) {
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relm(h);
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goto loop ;
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}
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/* XXX - is API_MSG_RX_IND for an MTP2 or MTP3 message? */
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dp = get_param(m);/* get pointer to MSG parameter area (m->param) */
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packet_len = m->len;
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caplen = p->snapshot ;
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if (caplen > packet_len) {
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caplen = packet_len;
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}
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/* Run the packet filter if there is one. */
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if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
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/* get a time stamp , consisting of :
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*
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* pcap_header.ts.tv_sec:
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* ----------------------
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* a UNIX format time-in-seconds when he packet was captured,
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* i.e. the number of seconds since Epoch time (January 1,1970, 00:00:00 GMT)
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*
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* pcap_header.ts.tv_usec :
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* ------------------------
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* the number of microseconds since that second
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* when the packet was captured
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*/
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(void)gettimeofday(&pcap_header.ts, NULL);
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/* Fill in our own header data */
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pcap_header.caplen = caplen;
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pcap_header.len = packet_len;
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/* Count the packet. */
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ps->stat.ps_recv++;
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/* Call the user supplied callback function */
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callback(user, &pcap_header, dp);
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processed++ ;
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}
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/* after being processed the packet must be
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*released in order to receive another one */
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relm(h);
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}else
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processed++;
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}
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while (processed < cnt) ;
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return processed ;
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}
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static int
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septel_inject(pcap_t *handle, const void *buf _U_, size_t size _U_)
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{
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strlcpy(handle->errbuf, "Sending packets isn't supported on Septel cards",
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PCAP_ERRBUF_SIZE);
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return (-1);
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}
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/*
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* Activate a handle for a live capture from the given Septel device. Always pass a NULL device
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* The promisc flag is ignored because Septel cards have built-in tracing.
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* The timeout is also ignored as it is not supported in hardware.
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*
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* See also pcap(3).
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*/
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static pcap_t *septel_activate(pcap_t* handle) {
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/* Initialize some components of the pcap structure. */
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handle->linktype = DLT_MTP2;
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handle->bufsize = 0;
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/*
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* "select()" and "poll()" don't work on Septel queues
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*/
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handle->selectable_fd = -1;
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handle->read_op = septel_read;
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handle->inject_op = septel_inject;
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handle->setfilter_op = septel_setfilter;
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handle->set_datalink_op = NULL; /* can't change data link type */
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handle->getnonblock_op = pcap_getnonblock_fd;
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handle->setnonblock_op = septel_setnonblock;
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handle->stats_op = septel_stats;
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return 0;
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}
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pcap_t *septel_create(const char *device, char *ebuf, int *is_ours) {
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const char *cp;
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pcap_t *p;
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/* Does this look like the Septel device? */
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cp = strrchr(device, '/');
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if (cp == NULL)
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cp = device;
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if (strcmp(cp, "septel") != 0) {
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/* Nope, it's not "septel" */
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*is_ours = 0;
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return NULL;
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}
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/* OK, it's probably ours. */
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*is_ours = 1;
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p = pcap_create_common(device, ebuf, sizeof (struct pcap_septel));
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if (p == NULL)
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return NULL;
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p->activate_op = septel_activate;
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return p;
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}
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static int septel_stats(pcap_t *p, struct pcap_stat *ps) {
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struct pcap_septel *handlep = p->priv;
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/*handlep->stat.ps_recv = 0;*/
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/*handlep->stat.ps_drop = 0;*/
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*ps = handlep->stat;
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return 0;
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}
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int
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septel_findalldevs(pcap_if_t **devlistp, char *errbuf)
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{
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return (pcap_add_if(devlistp,"septel",0,
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"Intel/Septel device",errbuf));
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}
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/*
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* Installs the given bpf filter program in the given pcap structure. There is
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* no attempt to store the filter in kernel memory as that is not supported
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* with Septel cards.
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*/
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static int septel_setfilter(pcap_t *p, struct bpf_program *fp) {
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if (!p)
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return -1;
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if (!fp) {
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strncpy(p->errbuf, "setfilter: No filter specified",
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sizeof(p->errbuf));
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return -1;
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}
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/* Make our private copy of the filter */
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if (install_bpf_program(p, fp) < 0) {
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snprintf(p->errbuf, sizeof(p->errbuf),
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"malloc: %s", pcap_strerror(errno));
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return -1;
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}
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return (0);
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}
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static int
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septel_setnonblock(pcap_t *p, int nonblock, char *errbuf)
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{
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fprintf(errbuf, PCAP_ERRBUF_SIZE, "Non-blocking mode not supported on Septel devices");
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return (-1);
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}
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