/* * pcap-dag.c: Packet capture interface for Endace DAG 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 DAG_ONLY and HAVE_DAG_API are defined. If HAVE_DAG_API is not * defined it should not get compiled in, otherwise if DAG_ONLY is defined then * the 'dag_' function calls are renamed to 'pcap_' equivalents. If DAG_ONLY * is not defined then nothing is altered - the dag_ functions will be * called as required from their pcap-linux/bpf equivalents. * * Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com) * Modifications: Jesper Peterson * Koryn Grant * Stephen Donnelly */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/libpcap/pcap-dag.c,v 1.31.2.8 2008-04-14 20:41:51 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include /* optionally get BSD define */ #include #include #include #include "pcap-int.h" #include #include #include #include #include #include struct mbuf; /* Squelch compiler warnings on some platforms for */ struct rtentry; /* declarations in */ #include #include "dagnew.h" #include "dagapi.h" #include "pcap-dag.h" #define ATM_CELL_SIZE 52 #define ATM_HDR_SIZE 4 /* * A header containing additional MTP information. */ #define MTP2_SENT_OFFSET 0 /* 1 byte */ #define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */ #define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */ #define MTP2_HDR_LEN 4 /* length of the header */ #define MTP2_ANNEX_A_NOT_USED 0 #define MTP2_ANNEX_A_USED 1 #define MTP2_ANNEX_A_USED_UNKNOWN 2 /* SunATM pseudo header */ struct sunatm_hdr { unsigned char flags; /* destination and traffic type */ unsigned char vpi; /* VPI */ unsigned short vci; /* VCI */ }; typedef struct pcap_dag_node { struct pcap_dag_node *next; pcap_t *p; pid_t pid; } pcap_dag_node_t; static pcap_dag_node_t *pcap_dags = NULL; static int atexit_handler_installed = 0; static const unsigned short endian_test_word = 0x0100; #define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word)) #ifdef DAG_ONLY /* This code is required when compiling for a DAG device only. */ /* Replace dag function names with pcap equivalent. */ #define dag_create pcap_create #define dag_platform_finddevs pcap_platform_finddevs #endif /* DAG_ONLY */ #define MAX_DAG_PACKET 65536 static unsigned char TempPkt[MAX_DAG_PACKET]; static int dag_setfilter(pcap_t *p, struct bpf_program *fp); static int dag_stats(pcap_t *p, struct pcap_stat *ps); static int dag_set_datalink(pcap_t *p, int dlt); static int dag_get_datalink(pcap_t *p); static int dag_setnonblock(pcap_t *p, int nonblock, char *errbuf); static void delete_pcap_dag(pcap_t *p) { pcap_dag_node_t *curr = NULL, *prev = NULL; for (prev = NULL, curr = pcap_dags; curr != NULL && curr->p != p; prev = curr, curr = curr->next) { /* empty */ } if (curr != NULL && curr->p == p) { if (prev != NULL) { prev->next = curr->next; } else { pcap_dags = curr->next; } } } /* * Performs a graceful shutdown of the DAG card, frees dynamic memory held * in the pcap_t structure, and closes the file descriptor for the DAG card. */ static void dag_platform_cleanup(pcap_t *p) { if (p != NULL) { #ifdef HAVE_DAG_STREAMS_API if(dag_stop_stream(p->fd, p->md.dag_stream) < 0) fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno)); if(dag_detach_stream(p->fd, p->md.dag_stream) < 0) fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno)); #else if(dag_stop(p->fd) < 0) fprintf(stderr,"dag_stop: %s\n", strerror(errno)); #endif /* HAVE_DAG_STREAMS_API */ if(p->fd != -1) { if(dag_close(p->fd) < 0) fprintf(stderr,"dag_close: %s\n", strerror(errno)); p->fd = -1; } delete_pcap_dag(p); pcap_cleanup_live_common(p); } /* Note: don't need to call close(p->fd) here as dag_close(p->fd) does this. */ } static void atexit_handler(void) { while (pcap_dags != NULL) { if (pcap_dags->pid == getpid()) { dag_platform_cleanup(pcap_dags->p); } else { delete_pcap_dag(pcap_dags->p); } } } static int new_pcap_dag(pcap_t *p) { pcap_dag_node_t *node = NULL; if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) { return -1; } if (!atexit_handler_installed) { atexit(atexit_handler); atexit_handler_installed = 1; } node->next = pcap_dags; node->p = p; node->pid = getpid(); pcap_dags = node; return 0; } static unsigned int dag_erf_ext_header_count(uint8_t * erf, size_t len) { uint32_t hdr_num = 0; uint8_t hdr_type; /* basic sanity checks */ if ( erf == NULL ) return 0; if ( len < 16 ) return 0; /* check if we have any extension headers */ if ( (erf[8] & 0x80) == 0x00 ) return 0; /* loop over the extension headers */ do { /* sanity check we have enough bytes */ if ( len <= (24 + (hdr_num * 8)) ) return hdr_num; /* get the header type */ hdr_type = erf[(16 + (hdr_num * 8))]; hdr_num++; } while ( hdr_type & 0x80 ); return hdr_num; } /* * Read at most max_packets from the capture stream 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 dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) { unsigned int processed = 0; int flags = p->md.dag_offset_flags; unsigned int nonblocking = flags & DAGF_NONBLOCK; unsigned int num_ext_hdr = 0; /* Get the next bufferful of packets (if necessary). */ while (p->md.dag_mem_top - p->md.dag_mem_bottom < dag_record_size) { /* * Has "pcap_breakloop()" been called? */ 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; } #ifdef HAVE_DAG_STREAMS_API /* dag_advance_stream() will block (unless nonblock is called) * until 64kB of data has accumulated. * If to_ms is set, it will timeout before 64kB has accumulated. * We wait for 64kB because processing a few packets at a time * can cause problems at high packet rates (>200kpps) due * to inefficiencies. * This does mean if to_ms is not specified the capture may 'hang' * for long periods if the data rate is extremely slow (<64kB/sec) * If non-block is specified it will return immediately. The user * is then responsible for efficiency. */ if ( NULL == (p->md.dag_mem_top = dag_advance_stream(p->fd, p->md.dag_stream, &(p->md.dag_mem_bottom))) ) { return -1; } #else /* dag_offset does not support timeouts */ p->md.dag_mem_top = dag_offset(p->fd, &(p->md.dag_mem_bottom), flags); #endif /* HAVE_DAG_STREAMS_API */ if (nonblocking && (p->md.dag_mem_top - p->md.dag_mem_bottom < dag_record_size)) { /* Pcap is configured to process only available packets, and there aren't any, return immediately. */ return 0; } if(!nonblocking && p->md.dag_timeout && (p->md.dag_mem_top - p->md.dag_mem_bottom < dag_record_size)) { /* Blocking mode, but timeout set and no data has arrived, return anyway.*/ return 0; } } /* Process the packets. */ while (p->md.dag_mem_top - p->md.dag_mem_bottom >= dag_record_size) { unsigned short packet_len = 0; int caplen = 0; struct pcap_pkthdr pcap_header; #ifdef HAVE_DAG_STREAMS_API dag_record_t *header = (dag_record_t *)(p->md.dag_mem_bottom); #else dag_record_t *header = (dag_record_t *)(p->md.dag_mem_base + p->md.dag_mem_bottom); #endif /* HAVE_DAG_STREAMS_API */ u_char *dp = ((u_char *)header); /* + dag_record_size; */ unsigned short rlen; /* * Has "pcap_breakloop()" been called? */ 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; } rlen = ntohs(header->rlen); if (rlen < dag_record_size) { strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE); return -1; } p->md.dag_mem_bottom += rlen; /* Count lost packets. */ switch((header->type & 0x7f)) { /* in these types the color value overwrites the lctr */ case TYPE_COLOR_HDLC_POS: case TYPE_COLOR_ETH: case TYPE_DSM_COLOR_HDLC_POS: case TYPE_DSM_COLOR_ETH: case TYPE_COLOR_MC_HDLC_POS: case TYPE_COLOR_HASH_ETH: case TYPE_COLOR_HASH_POS: break; default: if (header->lctr) { if (p->md.stat.ps_drop > (UINT_MAX - ntohs(header->lctr))) { p->md.stat.ps_drop = UINT_MAX; } else { p->md.stat.ps_drop += ntohs(header->lctr); } } } if ((header->type & 0x7f) == TYPE_PAD) { continue; } num_ext_hdr = dag_erf_ext_header_count(dp, rlen); /* ERF encapsulation */ /* The Extensible Record Format is not dropped for this kind of encapsulation, * and will be handled as a pseudo header by the decoding application. * The information carried in the ERF header and in the optional subheader (if present) * could be merged with the libpcap information, to offer a better decoding. * The packet length is * o the length of the packet on the link (header->wlen), * o plus the length of the ERF header (dag_record_size), as the length of the * pseudo header will be adjusted during the decoding, * o plus the length of the optional subheader (if present). * * The capture length is header.rlen and the byte stuffing for alignment will be dropped * if the capture length is greater than the packet length. */ if (p->linktype == DLT_ERF) { packet_len = ntohs(header->wlen) + dag_record_size; caplen = rlen; switch ((header->type & 0x7f)) { case TYPE_MC_AAL5: case TYPE_MC_ATM: case TYPE_MC_HDLC: packet_len += 4; /* MC header */ break; case TYPE_COLOR_HASH_ETH: case TYPE_DSM_COLOR_ETH: case TYPE_COLOR_ETH: case TYPE_ETH: packet_len += 2; /* ETH header */ break; } /* switch type */ /* Include ERF extension headers */ packet_len += (8 * num_ext_hdr); if (caplen > packet_len) { caplen = packet_len; } } else { /* Other kind of encapsulation according to the header Type */ /* Skip over generic ERF header */ dp += dag_record_size; /* Skip over extension headers */ dp += 8 * num_ext_hdr; switch((header->type & 0x7f)) { case TYPE_ATM: case TYPE_AAL5: if (header->type == TYPE_AAL5) { packet_len = ntohs(header->wlen); caplen = rlen - dag_record_size; } case TYPE_MC_ATM: if (header->type == TYPE_MC_ATM) { caplen = packet_len = ATM_CELL_SIZE; dp+=4; } case TYPE_MC_AAL5: if (header->type == TYPE_MC_AAL5) { packet_len = ntohs(header->wlen); caplen = rlen - dag_record_size - 4; dp+=4; } if (header->type == TYPE_ATM) { caplen = packet_len = ATM_CELL_SIZE; } if (p->linktype == DLT_SUNATM) { struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp; unsigned long rawatm; rawatm = ntohl(*((unsigned long *)dp)); sunatm->vci = htons((rawatm >> 4) & 0xffff); sunatm->vpi = (rawatm >> 20) & 0x00ff; sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) | ((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 : ((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 : ((dp[ATM_HDR_SIZE] == 0xaa && dp[ATM_HDR_SIZE+1] == 0xaa && dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1))); } else { packet_len -= ATM_HDR_SIZE; caplen -= ATM_HDR_SIZE; dp += ATM_HDR_SIZE; } break; case TYPE_COLOR_HASH_ETH: case TYPE_DSM_COLOR_ETH: case TYPE_COLOR_ETH: case TYPE_ETH: packet_len = ntohs(header->wlen); packet_len -= (p->md.dag_fcs_bits >> 3); caplen = rlen - dag_record_size - 2; if (caplen > packet_len) { caplen = packet_len; } dp += 2; break; case TYPE_COLOR_HASH_POS: case TYPE_DSM_COLOR_HDLC_POS: case TYPE_COLOR_HDLC_POS: case TYPE_HDLC_POS: packet_len = ntohs(header->wlen); packet_len -= (p->md.dag_fcs_bits >> 3); caplen = rlen - dag_record_size; if (caplen > packet_len) { caplen = packet_len; } break; case TYPE_COLOR_MC_HDLC_POS: case TYPE_MC_HDLC: packet_len = ntohs(header->wlen); packet_len -= (p->md.dag_fcs_bits >> 3); caplen = rlen - dag_record_size - 4; if (caplen > packet_len) { caplen = packet_len; } /* jump the MC_HDLC_HEADER */ dp += 4; #ifdef DLT_MTP2_WITH_PHDR if (p->linktype == DLT_MTP2_WITH_PHDR) { /* Add the MTP2 Pseudo Header */ caplen += MTP2_HDR_LEN; packet_len += MTP2_HDR_LEN; TempPkt[MTP2_SENT_OFFSET] = 0; TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN; *(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01); *(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff); memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen); dp = TempPkt; } #endif break; case TYPE_IPV4: packet_len = ntohs(header->wlen); caplen = rlen - dag_record_size; if (caplen > packet_len) { caplen = packet_len; } break; default: /* Unhandled ERF type. * Ignore rather than generating error */ continue; } /* switch type */ /* Skip over extension headers */ caplen -= (8 * num_ext_hdr); } /* ERF encapsulation */ if (caplen > p->snapshot) caplen = p->snapshot; /* Run the packet filter if there is one. */ if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) { /* convert between timestamp formats */ register unsigned long long ts; if (IS_BIGENDIAN()) { ts = SWAPLL(header->ts); } else { ts = header->ts; } pcap_header.ts.tv_sec = ts >> 32; ts = (ts & 0xffffffffULL) * 1000000; ts += 0x80000000; /* rounding */ pcap_header.ts.tv_usec = ts >> 32; if (pcap_header.ts.tv_usec >= 1000000) { pcap_header.ts.tv_usec -= 1000000; pcap_header.ts.tv_sec++; } /* 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); /* Only count packets that pass the filter, for consistency with standard Linux behaviour. */ processed++; if (processed == cnt && cnt > 0) { /* Reached the user-specified limit. */ return cnt; } } } return processed; } static int dag_inject(pcap_t *p, const void *buf _U_, size_t size _U_) { strlcpy(p->errbuf, "Sending packets isn't supported on DAG cards", PCAP_ERRBUF_SIZE); return (-1); } /* * Get a handle for a live capture from the given DAG device. Passing a NULL * device will result in a failure. The promisc flag is ignored because DAG * cards are always promiscuous. The to_ms parameter is used in setting the * API polling parameters. * * snaplen is now also ignored, until we get per-stream slen support. Set * slen with approprite DAG tool BEFORE pcap_activate(). * * See also pcap(3). */ static int dag_activate(pcap_t* handle) { #if 0 char conf[30]; /* dag configure string */ #endif char *s; int n; daginf_t* daginf; char * newDev = NULL; char * device = handle->opt.source; #ifdef HAVE_DAG_STREAMS_API uint32_t mindata; struct timeval maxwait; struct timeval poll; #endif if (device == NULL) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "device is NULL: %s", pcap_strerror(errno)); return -1; } /* Initialize some components of the pcap structure. */ #ifdef HAVE_DAG_STREAMS_API newDev = (char *)malloc(strlen(device) + 16); if (newDev == NULL) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s\n", pcap_strerror(errno)); goto fail; } /* Parse input name to get dag device and stream number if provided */ if (dag_parse_name(device, newDev, strlen(device) + 16, &handle->md.dag_stream) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: %s\n", pcap_strerror(errno)); goto fail; } device = newDev; if (handle->md.dag_stream%2) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture\n"); goto fail; } #else if (strncmp(device, "/dev/", 5) != 0) { newDev = (char *)malloc(strlen(device) + 5); if (newDev == NULL) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s\n", pcap_strerror(errno)); goto fail; } strcpy(newDev, "/dev/"); strcat(newDev, device); device = newDev; } #endif /* HAVE_DAG_STREAMS_API */ /* setup device parameters */ if((handle->fd = dag_open((char *)device)) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_open %s: %s", device, pcap_strerror(errno)); goto fail; } #ifdef HAVE_DAG_STREAMS_API /* Open requested stream. Can fail if already locked or on error */ if (dag_attach_stream(handle->fd, handle->md.dag_stream, 0, 0) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_attach_stream: %s\n", pcap_strerror(errno)); goto failclose; } /* Set up default poll parameters for stream * Can be overridden by pcap_set_nonblock() */ if (dag_get_stream_poll(handle->fd, handle->md.dag_stream, &mindata, &maxwait, &poll) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s\n", pcap_strerror(errno)); goto faildetach; } /* Amount of data to collect in Bytes before calling callbacks. * Important for efficiency, but can introduce latency * at low packet rates if to_ms not set! */ mindata = 65536; /* Obey md.timeout (was to_ms) if supplied. This is a good idea! * Recommend 10-100ms. Calls will time out even if no data arrived. */ maxwait.tv_sec = handle->md.timeout/1000; maxwait.tv_usec = (handle->md.timeout%1000) * 1000; if (dag_set_stream_poll(handle->fd, handle->md.dag_stream, mindata, &maxwait, &poll) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s\n", pcap_strerror(errno)); goto faildetach; } #else if((handle->md.dag_mem_base = dag_mmap(handle->fd)) == MAP_FAILED) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_mmap %s: %s\n", device, pcap_strerror(errno)); goto failclose; } #endif /* HAVE_DAG_STREAMS_API */ /* XXX Not calling dag_configure() to set slen; this is unsafe in * multi-stream environments as the gpp config is global. * Once the firmware provides 'per-stream slen' this can be supported * again via the Config API without side-effects */ #if 0 /* set the card snap length to the specified snaplen parameter */ /* This is a really bad idea, as different cards have different * valid slen ranges. Should fix in Config API. */ if (handle->snapshot == 0 || handle->snapshot > MAX_DAG_SNAPLEN) { handle->snapshot = MAX_DAG_SNAPLEN; } else if (snaplen < MIN_DAG_SNAPLEN) { handle->snapshot = MIN_DAG_SNAPLEN; } /* snap len has to be a multiple of 4 */ snprintf(conf, 30, "varlen slen=%d", (snaplen + 3) & ~3); if(dag_configure(handle->fd, conf) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_configure %s: %s\n", device, pcap_strerror(errno)); goto faildetach; } #endif #ifdef HAVE_DAG_STREAMS_API if(dag_start_stream(handle->fd, handle->md.dag_stream) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start_stream %s: %s\n", device, pcap_strerror(errno)); goto faildetach; } #else if(dag_start(handle->fd) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start %s: %s\n", device, pcap_strerror(errno)); goto failclose; } #endif /* HAVE_DAG_STREAMS_API */ /* * Important! You have to ensure bottom is properly * initialized to zero on startup, it won't give you * a compiler warning if you make this mistake! */ handle->md.dag_mem_bottom = 0; handle->md.dag_mem_top = 0; /* * Find out how many FCS bits we should strip. * First, query the card to see if it strips the FCS. */ daginf = dag_info(handle->fd); if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) { /* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */ handle->md.dag_fcs_bits = 0; /* Note that no FCS will be supplied. */ handle->linktype_ext = LT_FCS_DATALINK_EXT(0); } else { /* * Start out assuming it's 32 bits. */ handle->md.dag_fcs_bits = 32; /* Allow an environment variable to override. */ if ((s = getenv("ERF_FCS_BITS")) != NULL) { if ((n = atoi(s)) == 0 || n == 16 || n == 32) { handle->md.dag_fcs_bits = n; } else { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment\n", device, n); goto failstop; } } /* * Did the user request that they not be stripped? */ if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) { /* Yes. Note the number of bytes that will be supplied. */ handle->linktype_ext = LT_FCS_DATALINK_EXT(handle->md.dag_fcs_bits/16); /* And don't strip them. */ handle->md.dag_fcs_bits = 0; } } handle->md.dag_timeout = handle->md.timeout; handle->linktype = -1; if (dag_get_datalink(handle) < 0) goto failstop; handle->bufsize = 0; if (new_pcap_dag(handle) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "new_pcap_dag %s: %s\n", device, pcap_strerror(errno)); goto failstop; } /* * "select()" and "poll()" don't work on DAG device descriptors. */ handle->selectable_fd = -1; if (newDev != NULL) { free((char *)newDev); } handle->read_op = dag_read; handle->inject_op = dag_inject; handle->setfilter_op = dag_setfilter; handle->setdirection_op = NULL; /* Not implemented.*/ handle->set_datalink_op = dag_set_datalink; handle->getnonblock_op = pcap_getnonblock_fd; handle->setnonblock_op = dag_setnonblock; handle->stats_op = dag_stats; handle->cleanup_op = dag_platform_cleanup; handle->md.stat.ps_drop = 0; handle->md.stat.ps_recv = 0; return 0; #ifdef HAVE_DAG_STREAMS_API failstop: if (dag_stop_stream(handle->fd, handle->md.dag_stream) < 0) { fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno)); } faildetach: if (dag_detach_stream(handle->fd, handle->md.dag_stream) < 0) fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno)); #else failstop: if (dag_stop(handle->fd) < 0) fprintf(stderr,"dag_stop: %s\n", strerror(errno)); #endif /* HAVE_DAG_STREAMS_API */ failclose: if (dag_close(handle->fd) < 0) fprintf(stderr,"dag_close: %s\n", strerror(errno)); delete_pcap_dag(handle); fail: pcap_cleanup_live_common(handle); if (newDev != NULL) { free((char *)newDev); } return PCAP_ERROR; } pcap_t *dag_create(const char *device, char *ebuf) { pcap_t *p; p = pcap_create_common(device, ebuf); if (p == NULL) return NULL; p->activate_op = dag_activate; return p; } static int dag_stats(pcap_t *p, struct pcap_stat *ps) { /* This needs to be filled out correctly. Hopefully a dagapi call will provide all necessary information. */ /*p->md.stat.ps_recv = 0;*/ /*p->md.stat.ps_drop = 0;*/ *ps = p->md.stat; return 0; } /* * Previously we just generated a list of all possible names and let * pcap_add_if() attempt to open each one, but with streams this adds up * to 81 possibilities which is inefficient. * * Since we know more about the devices we can prune the tree here. * pcap_add_if() will still retest each device but the total number of * open attempts will still be much less than the naive approach. */ int dag_platform_finddevs(pcap_if_t **devlistp, char *errbuf) { char name[12]; /* XXX - pick a size */ int ret = 0; int c; char dagname[DAGNAME_BUFSIZE]; int dagstream; int dagfd; /* Try all the DAGs 0-9 */ for (c = 0; c < 9; c++) { snprintf(name, 12, "dag%d", c); if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream)) { return -1; } if ( (dagfd = dag_open(dagname)) >= 0 ) { if (pcap_add_if(devlistp, name, 0, NULL, errbuf) == -1) { /* * Failure. */ ret = -1; } #ifdef HAVE_DAG_STREAMS_API { int stream, rxstreams; rxstreams = dag_rx_get_stream_count(dagfd); for(stream=0;stream<16;stream+=2) { if (0 == dag_attach_stream(dagfd, stream, 0, 0)) { dag_detach_stream(dagfd, stream); snprintf(name, 10, "dag%d:%d", c, stream); if (pcap_add_if(devlistp, name, 0, NULL, errbuf) == -1) { /* * Failure. */ ret = -1; } } } } #endif /* HAVE_DAG_STREAMS_API */ dag_close(dagfd); } } 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 DAG cards. */ static int dag_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) return -1; p->md.use_bpf = 0; return (0); } static int dag_set_datalink(pcap_t *p, int dlt) { p->linktype = dlt; return (0); } static int dag_setnonblock(pcap_t *p, int nonblock, char *errbuf) { /* * Set non-blocking mode on the FD. * XXX - is that necessary? If not, don't bother calling it, * and have a "dag_getnonblock()" function that looks at * "p->md.dag_offset_flags". */ if (pcap_setnonblock_fd(p, nonblock, errbuf) < 0) return (-1); #ifdef HAVE_DAG_STREAMS_API { uint32_t mindata; struct timeval maxwait; struct timeval poll; if (dag_get_stream_poll(p->fd, p->md.dag_stream, &mindata, &maxwait, &poll) < 0) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s\n", pcap_strerror(errno)); return -1; } /* Amount of data to collect in Bytes before calling callbacks. * Important for efficiency, but can introduce latency * at low packet rates if to_ms not set! */ if(nonblock) mindata = 0; else mindata = 65536; if (dag_set_stream_poll(p->fd, p->md.dag_stream, mindata, &maxwait, &poll) < 0) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s\n", pcap_strerror(errno)); return -1; } } #endif /* HAVE_DAG_STREAMS_API */ if (nonblock) { p->md.dag_offset_flags |= DAGF_NONBLOCK; } else { p->md.dag_offset_flags &= ~DAGF_NONBLOCK; } return (0); } static int dag_get_datalink(pcap_t *p) { int index=0, dlt_index=0; uint8_t types[255]; memset(types, 0, 255); if (p->dlt_list == NULL && (p->dlt_list = malloc(255*sizeof(*(p->dlt_list)))) == NULL) { (void)snprintf(p->errbuf, sizeof(p->errbuf), "malloc: %s", pcap_strerror(errno)); return (-1); } p->linktype = 0; #ifdef HAVE_DAG_GET_STREAM_ERF_TYPES /* Get list of possible ERF types for this card */ if (dag_get_stream_erf_types(p->fd, p->md.dag_stream, types, 255) < 0) { snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_stream_erf_types: %s", pcap_strerror(errno)); return (-1); } while (types[index]) { #elif defined HAVE_DAG_GET_ERF_TYPES /* Get list of possible ERF types for this card */ if (dag_get_erf_types(p->fd, types, 255) < 0) { snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_erf_types: %s", pcap_strerror(errno)); return (-1); } while (types[index]) { #else /* Check the type through a dagapi call. */ types[index] = dag_linktype(p->fd); { #endif switch((types[index] & 0x7f)) { case TYPE_HDLC_POS: case TYPE_COLOR_HDLC_POS: case TYPE_DSM_COLOR_HDLC_POS: case TYPE_COLOR_HASH_POS: if (p->dlt_list != NULL) { p->dlt_list[dlt_index++] = DLT_CHDLC; p->dlt_list[dlt_index++] = DLT_PPP_SERIAL; p->dlt_list[dlt_index++] = DLT_FRELAY; } if(!p->linktype) p->linktype = DLT_CHDLC; break; case TYPE_ETH: case TYPE_COLOR_ETH: case TYPE_DSM_COLOR_ETH: case TYPE_COLOR_HASH_ETH: /* * This is (presumably) a real Ethernet capture; give it a * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so * that an application can let you choose it, in case you're * capturing DOCSIS traffic that a Cisco Cable Modem * Termination System is putting out onto an Ethernet (it * doesn't put an Ethernet header onto the wire, it puts raw * DOCSIS frames out on the wire inside the low-level * Ethernet framing). */ if (p->dlt_list != NULL) { p->dlt_list[dlt_index++] = DLT_EN10MB; p->dlt_list[dlt_index++] = DLT_DOCSIS; } if(!p->linktype) p->linktype = DLT_EN10MB; break; case TYPE_ATM: case TYPE_AAL5: case TYPE_MC_ATM: case TYPE_MC_AAL5: if (p->dlt_list != NULL) { p->dlt_list[dlt_index++] = DLT_ATM_RFC1483; p->dlt_list[dlt_index++] = DLT_SUNATM; } if(!p->linktype) p->linktype = DLT_ATM_RFC1483; break; case TYPE_COLOR_MC_HDLC_POS: case TYPE_MC_HDLC: if (p->dlt_list != NULL) { p->dlt_list[dlt_index++] = DLT_CHDLC; p->dlt_list[dlt_index++] = DLT_PPP_SERIAL; p->dlt_list[dlt_index++] = DLT_FRELAY; p->dlt_list[dlt_index++] = DLT_MTP2; p->dlt_list[dlt_index++] = DLT_MTP2_WITH_PHDR; p->dlt_list[dlt_index++] = DLT_LAPD; } if(!p->linktype) p->linktype = DLT_CHDLC; break; case TYPE_IPV4: if(!p->linktype) p->linktype = DLT_RAW; break; case TYPE_LEGACY: case TYPE_MC_RAW: case TYPE_MC_RAW_CHANNEL: case TYPE_IP_COUNTER: case TYPE_TCP_FLOW_COUNTER: case TYPE_INFINIBAND: case TYPE_IPV6: default: /* Libpcap cannot deal with these types yet */ /* Add no DLTs, but still covered by DLT_ERF */ break; } /* switch */ index++; } p->dlt_list[dlt_index++] = DLT_ERF; p->dlt_count = dlt_index; if(!p->linktype) p->linktype = DLT_ERF; return p->linktype; }