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Diffstat (limited to 'contrib/libpcap/pcap-septel.c')
| -rw-r--r-- | contrib/libpcap/pcap-septel.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/contrib/libpcap/pcap-septel.c b/contrib/libpcap/pcap-septel.c new file mode 100644 index 0000000..5169ec0 --- /dev/null +++ b/contrib/libpcap/pcap-septel.c @@ -0,0 +1,307 @@ +/* + * 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 1.1.2.2 2005/06/21 01:03:23 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 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_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 ; + + /* + * 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); +} + +/* + * 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; + + 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; + 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_setnonblock(pcap_t *p, int nonblock, char *errbuf) +{ + return (0); +} |
