/* * 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. * * Authors: Gilbert HOYEK (gil_hoyek@hotmail.com), Elias M. KHOURY * (+961 3 485243) */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/libpcap/pcap-septel.c,v 1.2.2.2 2008-04-14 20:41:52 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 Septel device only. */ #include "pcap-septel.h" /* Replace septel function names with pcap equivalent. */ #define septel_create pcap_create #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_setnonblock(pcap_t *p, int nonblock, char *errbuf); /* * 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 ; /* * 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*/ /* XXX = why not use API_MSG_TX_REQ for 0xcf00 and API_MSG_RX_IND * for 0x8f01? */ if ((t != 0xcf00) && (t != 0x8f01)) { relm(h); goto loop ; } /* XXX - is API_MSG_RX_IND for an MTP2 or MTP3 message? */ 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 ; } static int septel_inject(pcap_t *handle, const void *buf _U_, size_t size _U_) { strlcpy(handle->errbuf, "Sending packets isn't supported on Septel cards", PCAP_ERRBUF_SIZE); return (-1); } /* * Activate 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 timeout is also ignored as it is not supported in hardware. * * See also pcap(3). */ static pcap_t *septel_activate(pcap_t* handle) { /* Initialize some components of the pcap structure. */ handle->linktype = DLT_MTP2; handle->bufsize = 0; /* * "select()" and "poll()" don't work on Septel queues */ handle->selectable_fd = -1; handle->read_op = septel_read; handle->inject_op = septel_inject; handle->setfilter_op = septel_setfilter; handle->set_datalink_op = NULL; /* can't change data link type */ handle->getnonblock_op = pcap_getnonblock_fd; handle->setnonblock_op = septel_setnonblock; handle->stats_op = septel_stats; return 0; } pcap_t *septel_create(const char *device, char *ebuf) { pcap_t *p; p = pcap_create_common(device, ebuf); if (p == NULL) return NULL; p->activate_op = septel_activate; return p; } 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_setnonblock(pcap_t *p, int nonblock, char *errbuf) { return (0); }