2 * pcap-septel.c: Packet capture interface for Intel/Septel card.
4 * The functionality of this code attempts to mimic that of pcap-linux as much
5 * as possible. This code is compiled in several different ways depending on
6 * whether SEPTEL_ONLY and HAVE_SEPTEL_API are defined. If HAVE_SEPTEL_API is
7 * not defined it should not get compiled in, otherwise if SEPTEL_ONLY is
8 * defined then the 'septel_' function calls are renamed to 'pcap_'
9 * equivalents. If SEPTEL_ONLY is not defined then nothing is altered - the
10 * septel_ functions will be called as required from their
11 * pcap-linux/equivalents.
13 * Authors: Gilbert HOYEK (gil_hoyek@hotmail.com), Elias M. KHOURY
18 static const char rcsid[] _U_ =
19 "@(#) $Header: /tcpdump/master/libpcap/pcap-septel.c,v 1.4 2008-04-14 20:40:58 guy Exp $";
26 #include <sys/param.h>
35 #include <netinet/in.h>
37 #include <sys/socket.h>
38 #include <sys/types.h>
47 #include "pcap-septel.h"
49 static int septel_setfilter(pcap_t *p, struct bpf_program *fp);
50 static int septel_stats(pcap_t *p, struct pcap_stat *ps);
51 static int septel_setnonblock(pcap_t *p, int nonblock, char *errbuf);
54 * Read at most max_packets from the capture queue and call the callback
55 * for each of them. Returns the number of packets handled, -1 if an
56 * error occured, or -2 if we were told to break out of the loop.
58 static int septel_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) {
65 /* identifier for the message queue of the module(upe) from which we are capturing
66 * packets.These IDs are defined in system.txt . By default it is set to 0x2d
67 * so change it to 0xdd for technical reason and therefore the module id for upe becomes:
68 * LOCAL 0xdd * upe - Example user part task */
69 unsigned int id = 0xdd;
71 /* process the packets */
74 unsigned short packet_len = 0;
77 struct pcap_pkthdr pcap_header;
81 * Has "pcap_breakloop()" been called?
86 * Yes - clear the flag that indicates that
87 * it has, and return -2 to indicate that
88 * we were told to break out of the loop.
94 /*repeat until a packet is read
95 *a NULL message means :
96 * when no packet is in queue or all packets in queue already read */
98 /* receive packet in non-blocking mode
99 * GCT_grab is defined in the septel library software */
103 /* a couter is added here to avoid an infinite loop
104 * that will cause our capture program GUI to freeze while waiting
109 while ((m == NULL)&& (counter< 100)) ;
115 /* catch only messages with type = 0xcf00 or 0x8f01 corrsponding to ss7 messages*/
116 /* XXX = why not use API_MSG_TX_REQ for 0xcf00 and API_MSG_RX_IND
118 if ((t != 0xcf00) && (t != 0x8f01)) {
123 /* XXX - is API_MSG_RX_IND for an MTP2 or MTP3 message? */
124 dp = get_param(m);/* get pointer to MSG parameter area (m->param) */
126 caplen = p->snapshot ;
129 if (caplen > packet_len) {
133 /* Run the packet filter if there is one. */
134 if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
137 /* get a time stamp , consisting of :
139 * pcap_header.ts.tv_sec:
140 * ----------------------
141 * a UNIX format time-in-seconds when he packet was captured,
142 * i.e. the number of seconds since Epoch time (January 1,1970, 00:00:00 GMT)
144 * pcap_header.ts.tv_usec :
145 * ------------------------
146 * the number of microseconds since that second
147 * when the packet was captured
150 (void)gettimeofday(&pcap_header.ts, NULL);
152 /* Fill in our own header data */
153 pcap_header.caplen = caplen;
154 pcap_header.len = packet_len;
156 /* Count the packet. */
157 p->md.stat.ps_recv++;
159 /* Call the user supplied callback function */
160 callback(user, &pcap_header, dp);
165 /* after being processed the packet must be
166 *released in order to receive another one */
172 while (processed < cnt) ;
179 septel_inject(pcap_t *handle, const void *buf _U_, size_t size _U_)
181 strlcpy(handle->errbuf, "Sending packets isn't supported on Septel cards",
187 * Activate a handle for a live capture from the given Septel device. Always pass a NULL device
188 * The promisc flag is ignored because Septel cards have built-in tracing.
189 * The timeout is also ignored as it is not supported in hardware.
193 static pcap_t *septel_activate(pcap_t* handle) {
194 /* Initialize some components of the pcap structure. */
195 handle->linktype = DLT_MTP2;
200 * "select()" and "poll()" don't work on Septel queues
202 handle->selectable_fd = -1;
204 handle->read_op = septel_read;
205 handle->inject_op = septel_inject;
206 handle->setfilter_op = septel_setfilter;
207 handle->set_datalink_op = NULL; /* can't change data link type */
208 handle->getnonblock_op = pcap_getnonblock_fd;
209 handle->setnonblock_op = septel_setnonblock;
210 handle->stats_op = septel_stats;
215 pcap_t *septel_create(const char *device, char *ebuf, int *is_ours) {
219 /* Does this look like the Septel device? */
220 cp = strrchr(device, '/');
223 if (strcmp(cp, "septel") != 0) {
224 /* Nope, it's not "septel" */
229 /* OK, it's probably ours. */
232 p = pcap_create_common(device, ebuf);
236 p->activate_op = septel_activate;
240 static int septel_stats(pcap_t *p, struct pcap_stat *ps) {
241 /*p->md.stat.ps_recv = 0;*/
242 /*p->md.stat.ps_drop = 0;*/
251 septel_findalldevs(pcap_if_t **devlistp, char *errbuf)
254 const char description[512]= "Intel/Septel device";
255 char name[512]="septel" ;
257 pcap_add_if(devlistp,name,0,description,errbuf);
264 * Installs the given bpf filter program in the given pcap structure. There is
265 * no attempt to store the filter in kernel memory as that is not supported
268 static int septel_setfilter(pcap_t *p, struct bpf_program *fp) {
272 strncpy(p->errbuf, "setfilter: No filter specified",
277 /* Make our private copy of the filter */
279 if (install_bpf_program(p, fp) < 0) {
280 snprintf(p->errbuf, sizeof(p->errbuf),
281 "malloc: %s", pcap_strerror(errno));
292 septel_setnonblock(pcap_t *p, int nonblock, char *errbuf)