1ee2dd488SSam Leffler /* 2ee2dd488SSam Leffler * pcap-septel.c: Packet capture interface for Intel/Septel card. 3ee2dd488SSam Leffler * 4ee2dd488SSam Leffler * The functionality of this code attempts to mimic that of pcap-linux as much 5ee2dd488SSam Leffler * as possible. This code is compiled in several different ways depending on 6ee2dd488SSam Leffler * whether SEPTEL_ONLY and HAVE_SEPTEL_API are defined. If HAVE_SEPTEL_API is 7ee2dd488SSam Leffler * not defined it should not get compiled in, otherwise if SEPTEL_ONLY is 8ee2dd488SSam Leffler * defined then the 'septel_' function calls are renamed to 'pcap_' 9ee2dd488SSam Leffler * equivalents. If SEPTEL_ONLY is not defined then nothing is altered - the 10ee2dd488SSam Leffler * septel_ functions will be called as required from their 11ee2dd488SSam Leffler * pcap-linux/equivalents. 12ee2dd488SSam Leffler * 13ee2dd488SSam Leffler * Authors: Gilbert HOYEK (gil_hoyek@hotmail.com), Elias M. KHOURY 14ee2dd488SSam Leffler * (+961 3 485243) 15ee2dd488SSam Leffler */ 16ee2dd488SSam Leffler 17ee2dd488SSam Leffler #ifndef lint 18ee2dd488SSam Leffler static const char rcsid[] _U_ = 19ee2dd488SSam Leffler "@(#) $Header: /tcpdump/master/libpcap/pcap-septel.c,v 1.1.2.2 2005/06/21 01:03:23 guy Exp $"; 20ee2dd488SSam Leffler #endif 21ee2dd488SSam Leffler 22ee2dd488SSam Leffler #ifdef HAVE_CONFIG_H 23ee2dd488SSam Leffler #include "config.h" 24ee2dd488SSam Leffler #endif 25ee2dd488SSam Leffler 26ee2dd488SSam Leffler #include <sys/param.h> 27ee2dd488SSam Leffler 28ee2dd488SSam Leffler #include <stdlib.h> 29ee2dd488SSam Leffler #include <string.h> 30ee2dd488SSam Leffler #include <errno.h> 31ee2dd488SSam Leffler 32ee2dd488SSam Leffler #include "pcap-int.h" 33ee2dd488SSam Leffler 34ee2dd488SSam Leffler #include <ctype.h> 35ee2dd488SSam Leffler #include <netinet/in.h> 36ee2dd488SSam Leffler #include <sys/mman.h> 37ee2dd488SSam Leffler #include <sys/socket.h> 38ee2dd488SSam Leffler #include <sys/types.h> 39ee2dd488SSam Leffler #include <unistd.h> 40ee2dd488SSam Leffler 41ee2dd488SSam Leffler #ifdef HAVE_SEPTEL_API 42ee2dd488SSam Leffler #include <msg.h> 43ee2dd488SSam Leffler #include <ss7_inc.h> 44ee2dd488SSam Leffler #include <sysgct.h> 45ee2dd488SSam Leffler #include <pack.h> 46ee2dd488SSam Leffler #include <system.h> 47ee2dd488SSam Leffler #endif /* HAVE_SEPTEL_API */ 48ee2dd488SSam Leffler 49ee2dd488SSam Leffler #ifdef SEPTEL_ONLY 50ee2dd488SSam Leffler /* This code is required when compiling for a Septel device only. */ 51ee2dd488SSam Leffler #include "pcap-septel.h" 52ee2dd488SSam Leffler 53ee2dd488SSam Leffler /* Replace dag function names with pcap equivalent. */ 54ee2dd488SSam Leffler #define septel_open_live pcap_open_live 55ee2dd488SSam Leffler #define septel_platform_finddevs pcap_platform_finddevs 56ee2dd488SSam Leffler #endif /* SEPTEL_ONLY */ 57ee2dd488SSam Leffler 58ee2dd488SSam Leffler static int septel_setfilter(pcap_t *p, struct bpf_program *fp); 59ee2dd488SSam Leffler static int septel_stats(pcap_t *p, struct pcap_stat *ps); 60ee2dd488SSam Leffler static int septel_setnonblock(pcap_t *p, int nonblock, char *errbuf); 61ee2dd488SSam Leffler 62ee2dd488SSam Leffler static void septel_platform_close(pcap_t *p) { 63ee2dd488SSam Leffler 64ee2dd488SSam Leffler } 65ee2dd488SSam Leffler 66ee2dd488SSam Leffler 67ee2dd488SSam Leffler 68ee2dd488SSam Leffler /* 69ee2dd488SSam Leffler * Read at most max_packets from the capture queue and call the callback 70ee2dd488SSam Leffler * for each of them. Returns the number of packets handled, -1 if an 71ee2dd488SSam Leffler * error occured, or -2 if we were told to break out of the loop. 72ee2dd488SSam Leffler */ 73ee2dd488SSam Leffler static int septel_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) { 74ee2dd488SSam Leffler 75ee2dd488SSam Leffler HDR *h; 76ee2dd488SSam Leffler MSG *m; 77ee2dd488SSam Leffler int processed = 0 ; 78ee2dd488SSam Leffler int t = 0 ; 79ee2dd488SSam Leffler 80ee2dd488SSam Leffler /* identifier for the message queue of the module(upe) from which we are capturing 81ee2dd488SSam Leffler * packets.These IDs are defined in system.txt . By default it is set to 0x2d 82ee2dd488SSam Leffler * so change it to 0xdd for technical reason and therefore the module id for upe becomes: 83ee2dd488SSam Leffler * LOCAL 0xdd * upe - Example user part task */ 84ee2dd488SSam Leffler unsigned int id = 0xdd; 85ee2dd488SSam Leffler 86ee2dd488SSam Leffler /* process the packets */ 87ee2dd488SSam Leffler do { 88ee2dd488SSam Leffler 89ee2dd488SSam Leffler unsigned short packet_len = 0; 90ee2dd488SSam Leffler int caplen = 0; 91ee2dd488SSam Leffler int counter = 0; 92ee2dd488SSam Leffler struct pcap_pkthdr pcap_header; 93ee2dd488SSam Leffler u_char *dp ; 94ee2dd488SSam Leffler 95ee2dd488SSam Leffler /* 96ee2dd488SSam Leffler * Has "pcap_breakloop()" been called? 97ee2dd488SSam Leffler */ 98ee2dd488SSam Leffler loop: 99ee2dd488SSam Leffler if (p->break_loop) { 100ee2dd488SSam Leffler /* 101ee2dd488SSam Leffler * Yes - clear the flag that indicates that 102ee2dd488SSam Leffler * it has, and return -2 to indicate that 103ee2dd488SSam Leffler * we were told to break out of the loop. 104ee2dd488SSam Leffler */ 105ee2dd488SSam Leffler p->break_loop = 0; 106ee2dd488SSam Leffler return -2; 107ee2dd488SSam Leffler } 108ee2dd488SSam Leffler 109ee2dd488SSam Leffler /*repeat until a packet is read 110ee2dd488SSam Leffler *a NULL message means : 111ee2dd488SSam Leffler * when no packet is in queue or all packets in queue already read */ 112ee2dd488SSam Leffler do { 113ee2dd488SSam Leffler /* receive packet in non-blocking mode 114ee2dd488SSam Leffler * GCT_grab is defined in the septel library software */ 115ee2dd488SSam Leffler h = GCT_grab(id); 116ee2dd488SSam Leffler 117ee2dd488SSam Leffler m = (MSG*)h; 118ee2dd488SSam Leffler /* a couter is added here to avoid an infinite loop 119ee2dd488SSam Leffler * that will cause our capture program GUI to freeze while waiting 120ee2dd488SSam Leffler * for a packet*/ 121ee2dd488SSam Leffler counter++ ; 122ee2dd488SSam Leffler 123ee2dd488SSam Leffler } 124ee2dd488SSam Leffler while ((m == NULL)&& (counter< 100)) ; 125ee2dd488SSam Leffler 126ee2dd488SSam Leffler if (m != NULL) { 127ee2dd488SSam Leffler 128ee2dd488SSam Leffler t = h->type ; 129ee2dd488SSam Leffler 130ee2dd488SSam Leffler /* catch only messages with type = 0xcf00 or 0x8f01 corrsponding to ss7 messages*/ 131ee2dd488SSam Leffler /* XXX = why not use API_MSG_TX_REQ for 0xcf00 and API_MSG_RX_IND 132ee2dd488SSam Leffler * for 0x8f01? */ 133ee2dd488SSam Leffler if ((t != 0xcf00) && (t != 0x8f01)) { 134ee2dd488SSam Leffler relm(h); 135ee2dd488SSam Leffler goto loop ; 136ee2dd488SSam Leffler } 137ee2dd488SSam Leffler 138ee2dd488SSam Leffler /* XXX - is API_MSG_RX_IND for an MTP2 or MTP3 message? */ 139ee2dd488SSam Leffler dp = get_param(m);/* get pointer to MSG parameter area (m->param) */ 140ee2dd488SSam Leffler packet_len = m->len; 141ee2dd488SSam Leffler caplen = p->snapshot ; 142ee2dd488SSam Leffler 143ee2dd488SSam Leffler 144ee2dd488SSam Leffler if (caplen > packet_len) { 145ee2dd488SSam Leffler 146ee2dd488SSam Leffler caplen = packet_len; 147ee2dd488SSam Leffler } 148ee2dd488SSam Leffler /* Run the packet filter if there is one. */ 149ee2dd488SSam Leffler if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) { 150ee2dd488SSam Leffler 151ee2dd488SSam Leffler 152ee2dd488SSam Leffler /* get a time stamp , consisting of : 153ee2dd488SSam Leffler * 154ee2dd488SSam Leffler * pcap_header.ts.tv_sec: 155ee2dd488SSam Leffler * ---------------------- 156ee2dd488SSam Leffler * a UNIX format time-in-seconds when he packet was captured, 157ee2dd488SSam Leffler * i.e. the number of seconds since Epoch time (January 1,1970, 00:00:00 GMT) 158ee2dd488SSam Leffler * 159ee2dd488SSam Leffler * pcap_header.ts.tv_usec : 160ee2dd488SSam Leffler * ------------------------ 161ee2dd488SSam Leffler * the number of microseconds since that second 162ee2dd488SSam Leffler * when the packet was captured 163ee2dd488SSam Leffler */ 164ee2dd488SSam Leffler 165ee2dd488SSam Leffler (void)gettimeofday(&pcap_header.ts, NULL); 166ee2dd488SSam Leffler 167ee2dd488SSam Leffler /* Fill in our own header data */ 168ee2dd488SSam Leffler pcap_header.caplen = caplen; 169ee2dd488SSam Leffler pcap_header.len = packet_len; 170ee2dd488SSam Leffler 171ee2dd488SSam Leffler /* Count the packet. */ 172ee2dd488SSam Leffler p->md.stat.ps_recv++; 173ee2dd488SSam Leffler 174ee2dd488SSam Leffler /* Call the user supplied callback function */ 175ee2dd488SSam Leffler callback(user, &pcap_header, dp); 176ee2dd488SSam Leffler 177ee2dd488SSam Leffler processed++ ; 178ee2dd488SSam Leffler 179ee2dd488SSam Leffler } 180ee2dd488SSam Leffler /* after being processed the packet must be 181ee2dd488SSam Leffler *released in order to receive another one */ 182ee2dd488SSam Leffler relm(h); 183ee2dd488SSam Leffler }else 184ee2dd488SSam Leffler processed++; 185ee2dd488SSam Leffler 186ee2dd488SSam Leffler } 187ee2dd488SSam Leffler while (processed < cnt) ; 188ee2dd488SSam Leffler 189ee2dd488SSam Leffler return processed ; 190ee2dd488SSam Leffler } 191ee2dd488SSam Leffler 192ee2dd488SSam Leffler 193ee2dd488SSam Leffler static int 194ee2dd488SSam Leffler septel_inject(pcap_t *handle, const void *buf _U_, size_t size _U_) 195ee2dd488SSam Leffler { 196ee2dd488SSam Leffler strlcpy(handle->errbuf, "Sending packets isn't supported on Septel cards", 197ee2dd488SSam Leffler PCAP_ERRBUF_SIZE); 198ee2dd488SSam Leffler return (-1); 199ee2dd488SSam Leffler } 200ee2dd488SSam Leffler 201ee2dd488SSam Leffler /* 202ee2dd488SSam Leffler * Get a handle for a live capture from the given Septel device. Always pass a NULL device 203ee2dd488SSam Leffler * The promisc flag is ignored because Septel cards have built-in tracing. 204ee2dd488SSam Leffler * The to_ms parameter is also ignored as it is 205ee2dd488SSam Leffler * not supported in hardware. 206ee2dd488SSam Leffler * 207ee2dd488SSam Leffler * See also pcap(3). 208ee2dd488SSam Leffler */ 209ee2dd488SSam Leffler pcap_t *septel_open_live(const char *device, int snaplen, int promisc, int to_ms, char *ebuf) { 210ee2dd488SSam Leffler pcap_t *handle; 211ee2dd488SSam Leffler 212ee2dd488SSam Leffler handle = malloc(sizeof(*handle)); 213ee2dd488SSam Leffler if (handle == NULL) { 214ee2dd488SSam Leffler snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc %s: %s", device, pcap_strerror(errno)); 215ee2dd488SSam Leffler return NULL; 216ee2dd488SSam Leffler } 217ee2dd488SSam Leffler 218ee2dd488SSam Leffler /* Initialize some components of the pcap structure. */ 219ee2dd488SSam Leffler 220ee2dd488SSam Leffler memset(handle, 0, sizeof(*handle)); 221ee2dd488SSam Leffler 222ee2dd488SSam Leffler handle->snapshot = snaplen; 223ee2dd488SSam Leffler 224ee2dd488SSam Leffler handle->linktype = DLT_MTP2; 225ee2dd488SSam Leffler 226ee2dd488SSam Leffler handle->bufsize = 0; 227ee2dd488SSam Leffler 228ee2dd488SSam Leffler /* 229ee2dd488SSam Leffler * "select()" and "poll()" don't work on Septel queues 230ee2dd488SSam Leffler */ 231ee2dd488SSam Leffler handle->selectable_fd = -1; 232ee2dd488SSam Leffler 233ee2dd488SSam Leffler handle->read_op = septel_read; 234ee2dd488SSam Leffler handle->inject_op = septel_inject; 235ee2dd488SSam Leffler handle->setfilter_op = septel_setfilter; 236ee2dd488SSam Leffler handle->set_datalink_op = NULL; /* can't change data link type */ 237ee2dd488SSam Leffler handle->getnonblock_op = pcap_getnonblock_fd; 238ee2dd488SSam Leffler handle->setnonblock_op = septel_setnonblock; 239ee2dd488SSam Leffler handle->stats_op = septel_stats; 240ee2dd488SSam Leffler handle->close_op = septel_platform_close; 241ee2dd488SSam Leffler 242ee2dd488SSam Leffler return handle; 243ee2dd488SSam Leffler 244ee2dd488SSam Leffler fail: 245ee2dd488SSam Leffler if (handle != NULL) { 246ee2dd488SSam Leffler free(handle); 247ee2dd488SSam Leffler } 248ee2dd488SSam Leffler 249ee2dd488SSam Leffler return NULL; 250ee2dd488SSam Leffler } 251ee2dd488SSam Leffler 252ee2dd488SSam Leffler static int septel_stats(pcap_t *p, struct pcap_stat *ps) { 253ee2dd488SSam Leffler /*p->md.stat.ps_recv = 0;*/ 254ee2dd488SSam Leffler /*p->md.stat.ps_drop = 0;*/ 255ee2dd488SSam Leffler 256ee2dd488SSam Leffler *ps = p->md.stat; 257ee2dd488SSam Leffler 258ee2dd488SSam Leffler return 0; 259ee2dd488SSam Leffler } 260ee2dd488SSam Leffler 261ee2dd488SSam Leffler 262ee2dd488SSam Leffler int 263ee2dd488SSam Leffler septel_platform_finddevs(pcap_if_t **devlistp, char *errbuf) 264ee2dd488SSam Leffler { 265ee2dd488SSam Leffler unsigned char *p; 266ee2dd488SSam Leffler const char description[512]= "Intel/Septel device"; 267ee2dd488SSam Leffler char name[512]="septel" ; 268ee2dd488SSam Leffler int ret = 0; 269ee2dd488SSam Leffler pcap_add_if(devlistp,name,0,description,errbuf); 270ee2dd488SSam Leffler 271ee2dd488SSam Leffler return (ret); 272ee2dd488SSam Leffler } 273ee2dd488SSam Leffler 274ee2dd488SSam Leffler 275ee2dd488SSam Leffler /* 276ee2dd488SSam Leffler * Installs the given bpf filter program in the given pcap structure. There is 277ee2dd488SSam Leffler * no attempt to store the filter in kernel memory as that is not supported 278ee2dd488SSam Leffler * with Septel cards. 279ee2dd488SSam Leffler */ 280ee2dd488SSam Leffler static int septel_setfilter(pcap_t *p, struct bpf_program *fp) { 281ee2dd488SSam Leffler if (!p) 282ee2dd488SSam Leffler return -1; 283ee2dd488SSam Leffler if (!fp) { 284ee2dd488SSam Leffler strncpy(p->errbuf, "setfilter: No filter specified", 285ee2dd488SSam Leffler sizeof(p->errbuf)); 286ee2dd488SSam Leffler return -1; 287ee2dd488SSam Leffler } 288ee2dd488SSam Leffler 289ee2dd488SSam Leffler /* Make our private copy of the filter */ 290ee2dd488SSam Leffler 291ee2dd488SSam Leffler if (install_bpf_program(p, fp) < 0) { 292ee2dd488SSam Leffler snprintf(p->errbuf, sizeof(p->errbuf), 293ee2dd488SSam Leffler "malloc: %s", pcap_strerror(errno)); 294ee2dd488SSam Leffler return -1; 295ee2dd488SSam Leffler } 296ee2dd488SSam Leffler 297ee2dd488SSam Leffler p->md.use_bpf = 0; 298ee2dd488SSam Leffler 299ee2dd488SSam Leffler return (0); 300ee2dd488SSam Leffler } 301ee2dd488SSam Leffler 302ee2dd488SSam Leffler 303ee2dd488SSam Leffler static int 304ee2dd488SSam Leffler septel_setnonblock(pcap_t *p, int nonblock, char *errbuf) 305ee2dd488SSam Leffler { 306ee2dd488SSam Leffler return (0); 307ee2dd488SSam Leffler } 308