source: lib/format_wag.c @ 1974620

/*
 * This file is part of libtrace
 *
 * Copyright (c) 2004 The University of Waikato, Hamilton, New Zealand.
 * Authors: Daniel Lawson 
 *          Perry Lorier 
 *          
 * All rights reserved.
 *
 * This code has been developed by the University of Waikato WAND 
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libtrace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * libtrace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with libtrace; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id$
 *
 */

#include "libtrace.h"
#include "libtrace_int.h"
#include "format_helper.h"
#include "wag.h"
#include "config.h"

#ifdef HAVE_INTTYPES_H
#  include <inttypes.h>
#else
#  error "Can't find inttypes.h - this needs to be fixed"
#endif 

#ifdef HAVE_STDDEF_H
#  include <stddef.h>
#else
# error "Can't find stddef.h - do you define ptrdiff_t elsewhere?"
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <netdb.h>

#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif

static struct libtrace_format_t *wag_ptr = 0;

#define CONNINFO libtrace->format_data->conn_info
#define INPUT libtrace->format_data->input
#define OUTPUT libtrace->format_data->output
#define OPTIONS libtrace->format_data->options

struct libtrace_format_data_t {
        union {
                /** Information about rtclients */
                struct {
                        char *hostname;
                        short port;
                } rt;
                char *path;             /**< information for local sockets */
        } conn_info;
        /** Information about the current state of the input device */
        union {
                int fd;
#if HAVE_ZLIB
                gzFile *file;
#else   
                FILE *file;
#endif
        } input;        
};

struct libtrace_format_data_out_t {
        union {
                char *path;
        } conn_info;
        union {
                struct {
                        int level;
                } zlib;
        } options;
        union {
                int fd;
#if HAVE_ZLIB
                gzFile *file;
#else
                FILE *file;
#endif
        } output;
};

static int wag_init_input(struct libtrace_t *libtrace) {
        struct stat buf;
        struct hostent *he;
        struct sockaddr_in remote;
        struct sockaddr_un unix_sock;
        libtrace->format_data = (struct libtrace_format_data_t *) 
                calloc(1,sizeof(struct libtrace_format_data_t));
        CONNINFO.path = libtrace->uridata;
        if (!strncmp(CONNINFO.path,"-",1)) {
                libtrace->sourcetype = STDIN;
                // STDIN
#if HAVE_ZLIB
                INPUT.file = gzdopen(STDIN, "r");
#else   
                INPUT.file = stdin;
#endif

        } else {
                if (stat(CONNINFO.path,&buf) == -1 ) {
                        perror("stat");
                        return 0;
                }
                if (S_ISSOCK(buf.st_mode)) {
                        libtrace->sourcetype = SOCKET;
                        // SOCKET
                        if ((INPUT.fd = socket(
                                        AF_UNIX, SOCK_STREAM, 0)) == -1) {
                                perror("socket");
                                return 0;
                        }
                        unix_sock.sun_family = AF_UNIX;
                        bzero(unix_sock.sun_path,108);
                        snprintf(unix_sock.sun_path,
                                        108,"%s"
                                        ,CONNINFO.path);

                        if (connect(INPUT.fd, 
                                        (struct sockaddr *)&unix_sock,
                                        sizeof(struct sockaddr)) == -1) {
                                perror("connect (unix)");
                                return 0;
                        }
                } else { 
                        // TRACE
                        libtrace->sourcetype = TRACE;
#if HAVE_ZLIB
                        // using gzdopen means we can set O_LARGEFILE
                        // ourselves. However, this way is messy and 
                        // we lose any error checking on "open"
                        INPUT.file = 
                                gzdopen(open(
                                        CONNINFO.path,
                                        O_LARGEFILE), "r");
#else
                        INPUT.file = 
                                fdopen(open(
                                        CONNINFO.path,
                                        O_LARGEFILE), "r");
#endif

                }
        }
        return 1;
}

static int wag_init_output(struct libtrace_out_t *libtrace) {
        char *filemode = 0;
        libtrace->format_data = (struct libtrace_format_data_out_t *)
                calloc(1,sizeof(struct libtrace_format_data_out_t));

        OPTIONS.zlib.level = 0;
        asprintf(&filemode,"wb%d",OPTIONS.zlib.level);
        if (!strncmp(libtrace->uridata,"-",1)) {
                // STDOUT                               
#if HAVE_ZLIB
                OUTPUT.file = gzdopen(dup(1), filemode);
#else
                OUTPUT.file = stdout;
#endif
        } else {
                // TRACE
#if HAVE_ZLIB
                OUTPUT.file = gzdopen(open(
                                        libtrace->uridata,
                                        O_CREAT | O_LARGEFILE | O_WRONLY,
                                        S_IRUSR | S_IWUSR), filemode);
#else
                OUTPUT.file = fdopen(open(
                                        O_CREAT | O_LARGEFILE | O_WRONLY,
                                        S_IRUSR | S_IWUSR), "w");
#endif
        }

        return 1;
}

static int wag_config_output(struct libtrace_out_t *libtrace, int argc, char *argv[]) {
#if HAVE_ZLIB
        int opt;
        int level = OPTIONS.zlib.level;
        optind = 1;
        while ((opt = getopt(argc, argv, "z:")) != EOF) {
                switch (opt) {
                        case 'z':
                                level = atoi(optarg);
                                break;
                        default:
                                printf("Bad argument to wag: %s\n", opt);
                                return -1;
                }
        }
        if (level != OPTIONS.zlib.level) {
                if (level > 9 || level < 0) {
                        // retarded level choice
                        printf("Compression level must be between 0 and 9 inclusive - you selected %i \n", level);
                } else {
                        OPTIONS.zlib.level = level;
                        return gzsetparams(OUTPUT.file, level, Z_DEFAULT_STRATEGY);
                }
        }
#endif
        return 0;
}

static int wag_fin_input(struct libtrace_t *libtrace) {
#if HAVE_ZLIB
        gzclose(INPUT.file);
#else   
        fclose(INPUT.file);     
#endif
}

static int wag_fin_output(struct libtrace_out_t *libtrace) {
#if HAVE_ZLIB
        gzclose(OUTPUT.file);
#else
        fclose(OUTPUT.file);
#endif
}

static int wag_read(struct libtrace_t *libtrace, void *buffer, size_t len) {
        int numbytes;
        static short lctr = 0;
        int rlen;
        assert(libtrace);
        assert(len >= 0);

        if (buffer == 0)
                buffer = malloc(len);

        while(1) {
                switch(libtrace->sourcetype) {
                        case DEVICE:
                                if ((numbytes=read(INPUT.fd, 
                                                                buffer, 
                                                                len)) == -1) {
                                        perror("read");
                                        return -1;
                                }
                                break;
                        default:
#if HAVE_ZLIB
                                if ((numbytes=gzread(INPUT.file,
                                                                buffer,
                                                                len)) == -1) {
                                        perror("gzread");
                                        return -1;
                                }
#else
                                if ((numbytes=fread(buffer,len,1,
                                        INPUT.file)) == 0 ) {
                                        if(feof(INPUT.file)) {
                                                return 0;
                                        }
                                        if(ferror(INPUT.file)) {
                                                perror("fread");
                                                return -1;
                                        }
                                        return 0;
                                }
#endif
                }
                break;
        }
        return numbytes;

}


static int wag_read_packet(struct libtrace_t *libtrace, struct libtrace_packet_t *packet) {
        int numbytes;
        int size;
        char buf[RP_BUFSIZE];
        int read_required = 0;
        struct wag_frame_hdr *waghdr = 0;

        void *buffer = 0;

        packet->trace = libtrace;
        buffer = packet->buffer;
        

        do {
                if (fifo_out_available(libtrace->fifo) == 0 || read_required) {
                        if ((numbytes = wag_read(libtrace,buf,RP_BUFSIZE)) <= 0) {
                                return numbytes;
                        }
                        assert(libtrace->fifo);
                        fifo_write(libtrace->fifo,buf,numbytes);
                        read_required = 0;
                }
                // read in wag_frame_hdr
                if ((numbytes = fifo_out_read(libtrace->fifo, 
                                                buffer,
                                                sizeof(struct wag_frame_hdr)))
                                == 0 ) {
                        fifo_out_reset(libtrace->fifo);
                        read_required = 1;
                        continue;
                }
                
                size = ntohs(((struct wag_frame_hdr *)buffer)->size);

                // wag isn't in network byte order yet
                //size = htons(size);
                //printf("%d %d\n",size,htons(size));

                // read in full packet
                if((numbytes = fifo_out_read(libtrace->fifo,buffer,size)) == 0) {
                        fifo_out_reset(libtrace->fifo);
                        read_required = 1;
                        continue;
                }

                // have the whole packet
                fifo_out_update(libtrace->fifo,size);
                fifo_ack_update(libtrace->fifo,size);

                packet->size = numbytes;
                return numbytes;
        } while(1);
}

static int wag_write_packet(struct libtrace_out_t *libtrace, struct libtrace_packet_t *packet) {
        int numbytes =0 ;
        if (packet->trace->format != wag_ptr) {
                fprintf(stderr,"Cannot convert from wag to %s format yet\n",
                                packet->trace->format->name);
                return -1;
        }
#if HAVE_ZLIB
        if ((numbytes = gzwrite(OUTPUT.file, packet->buffer, packet->size)) == 0) {
                perror("gzwrite");
                return -1;
        }
#else
        if ((numbytes = write(OUTPUT.file, packet->buffer, packet->size)) == 0) {
                perror("write");
                return -1;
        }
#endif
        return numbytes;
}

static void *wag_get_link(const struct libtrace_packet_t *packet) {
        struct wag_data_frame *wagptr = (struct wag_data_frame *)packet->buffer;
        void *payload = wagptr->data;
        return (void*)payload;
}

static libtrace_linktype_t wag_get_link_type(const struct libtrace_packet_t *packet) {
        return TRACE_TYPE_80211;
}

static int8_t wag_get_direction(const struct libtrace_packet_t *packet) {
        struct wag_data_frame *wagptr = (struct wag_data_frame *)packet->buffer;
        if (wagptr->hdr.type == 0) {
                return wagptr->hdr.subtype;
        }
        return -1;
}

static uint64_t wag_get_erf_timestamp(const struct libtrace_packet_t *packet) {
        struct wag_data_frame *wagptr = (struct wag_data_frame *)packet->buffer;
        uint64_t timestamp = 0;
        timestamp = wagptr->ts.subsecs;
        //timestamp |= (uint64_t)wagptr->ts.secs<<32;
        timestamp = ((timestamp%44000000)*(UINT_MAX/44000000)) 
                | ((timestamp/44000000)<<32);
        return timestamp;
}

static int wag_get_capture_length(const struct libtrace_packet_t *packet) {
        struct wag_data_frame *wagptr = (struct wag_data_frame *)packet->buffer;
        //return (wagptr->hdr.size);
        return ntohs(wagptr->hdr.size);
}

static int wag_get_wire_length(const struct libtrace_packet_t *packet) {
        struct wag_data_frame *wagptr = (struct wag_data_frame *)packet->buffer;
        //return (wagptr->hdr.size);
        return ntohs(wagptr->hdr.size);
}

static int wag_get_fd(const struct libtrace_packet_t *packet) {
        return packet->trace->format_data->input.fd;
}

static struct libtrace_eventobj_t wag_event_trace(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
        switch(trace->sourcetype) {
                case DEVICE:
                        return trace_event_device(trace,packet);
                default:
                        return trace_event_trace(trace,packet);
        }
}
static int wag_help() {
        printf("wag format module: $Revision$\n");
        printf("Supported input URIs:\n");
        printf("\twag:/dev/wagn\n");
        printf("\twag:/path/to/trace.wag\n");
        printf("\twag:/path/to/trace.wag.gz\n");
        printf("\n");
        printf("\te.g.: wag:/dev/wag0\n");
        printf("\te.g.: wag:/tmp/trace.wag.gz\n");
        printf("\n");
        printf("Supported output URIs:\n");
        printf("\tnone\n");
        printf("\n");

}

static struct libtrace_format_t wag = {
        "wag",
        "$Id$",
        "wag",
        wag_init_input,                 /* init_input */        
        wag_init_output,                /* init_output */
        wag_config_output,              /* config_output */
        wag_fin_input,                  /* fin_input */
        wag_fin_output,                 /* fin_output */
        wag_read_packet,                /* read_packet */
        wag_write_packet,               /* write_packet */
        wag_get_link,                   /* get_link */
        wag_get_link_type,              /* get_link_type */
        wag_get_direction,              /* get_direction */
        NULL,                           /* set_direction */
        wag_get_erf_timestamp,          /* get_erf_timestamp */
        NULL,                           /* get_timeval */
        NULL,                           /* get_seconds */
        wag_get_capture_length,         /* get_capture_length */
        wag_get_wire_length,            /* get_wire_length */
        NULL,                           /* set_capture_length */
        wag_get_fd,                     /* get_fd */
        wag_event_trace,                /* trace_event */
        wag_help                        /* help */
};

void __attribute__((constructor)) wag_constructor() {
        wag_ptr = &wag;
        register_format(wag_ptr);
}