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# tcpdump.c

Go to the documentation of this file.

    00001 /*
    00002  * Copyright (c) 2001, Swedish Institute of Computer Science.
    00003  * All rights reserved.
    00004  *
    00005  * Redistribution and use in source and binary forms, with or without
    00006  * modification, are permitted provided that the following conditions
    00007  * are met:
    00008  * 1. Redistributions of source code must retain the above copyright
    00009  *    notice, this list of conditions and the following disclaimer.
    00010  * 2. Redistributions in binary form must reproduce the above copyright
    00011  *    notice, this list of conditions and the following disclaimer in the
    00012  *    documentation and/or other materials provided with the distribution.
    00013  * 3. Neither the name of the Institute nor the names of its contributors
    00014  *    may be used to endorse or promote products derived from this software
    00015  *    without specific prior written permission.
    00016  *
    00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
    00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
    00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    00027  * SUCH DAMAGE.
    00028  *
    00029  * This file is part of the lwIP TCP/IP stack.
    00030  *
    00031  * Author: Adam Dunkels <adam@sics.se>
    00032  *
    00033  * $Id: tcpdump_8c-source.html 88 2016-01-12 00:11:29Z reddawg $
    00034  */
    00035
    00036 #include <vfs/file.h>
    00037 #include <ubixos/kpanic.h>
    00038
    00039 #include "netif/tcpdump.h"
    00040 #include "net/ipv4/ip.h"
    00041 #include "net/tcp.h"
    00042 #include "net/udp.h"
    00043 #include "net/ipv4/inet.h"
    00044
    00045 fileDescriptor *file = NULL;
    00046
    00047 void tcpdump_init(void) {
    00048   char *fname;
    00049
    00050   fname = "tcpdump";
    00051   file = fopen(fname, "wb");
    00052   if(file == NULL) {
    00053     kpanic("tcpdump_init: fopen\n");
    00054     }
    00055   }
    00056
    00057 void tcpdump(struct pbuf *p) {
    00058 /*
    00059   struct ip_hdr *iphdr;
    00060   struct tcp_hdr *tcphdr;
    00061   struct udp_hdr *udphdr;
    00062   char flags[5];
    00063   int i;
    00064   int len;
    00065   int offset;
    00066 */
    00067   if (file == NULL) {
    00068     return;
    00069     }
    00070
    00071   /*
    00072   iphdr = p->payload;
    00073   switch(IPH_PROTO(iphdr)) {
    00074   case IP_PROTO_TCP:
    00075     tcphdr = (struct tcp_hdr *)((char *)iphdr + IP_HLEN);
    00076
    00077     pbuf_header(p, -IP_HLEN);
    00078     if(inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
    00079                           (struct ip_addr *)&(iphdr->dest),
    00080                           IP_PROTO_TCP, p->tot_len) != 0) {
    00081       DEBUGF(TCPDUMP_DEBUG, ("tcpdump: IP checksum failed!\n"));
    00082       fprintf(file, "!chksum ");
    00083     }
    00084
    00085     i = 0;
    00086     if(TCPH_FLAGS(tcphdr) & TCP_SYN) {
    00087       flags[i++] = 'S';
    00088     }
    00089     if(TCPH_FLAGS(tcphdr) & TCP_PSH) {
    00090       flags[i++] = 'P';
    00091     }
    00092     if(TCPH_FLAGS(tcphdr) & TCP_FIN) {
    00093       flags[i++] = 'F';
    00094     }
    00095     if(TCPH_FLAGS(tcphdr) & TCP_RST) {
    00096       flags[i++] = 'R';
    00097     }
    00098     if(i == 0) {
    00099       flags[i++] = '.';
    00100     }
    00101     flags[i++] = 0;
    00102
    00103
    00104
    00105     fprintf(file, "%d.%d.%d.%d.%u > %d.%d.%d.%d.%u: ",
    00106             (int)(ntohl(iphdr->src.addr) >> 24) & 0xff,
    00107             (int)(ntohl(iphdr->src.addr) >> 16) & 0xff,
    00108             (int)(ntohl(iphdr->src.addr) >> 8) & 0xff,
    00109             (int)(ntohl(iphdr->src.addr) >> 0) & 0xff,
    00110             ntohs(tcphdr->src),
    00111           (int)(ntohl(iphdr->dest.addr) >> 24) & 0xff,
    00112             (int)(ntohl(iphdr->dest.addr) >> 16) & 0xff,
    00113             (int)(ntohl(iphdr->dest.addr) >> 8) & 0xff,
    00114             (int)(ntohl(iphdr->dest.addr) >> 0) & 0xff,
    00115             ntohs(tcphdr->dest));
    00116     offset = TCPH_OFFSET(tcphdr) >> 4;
    00117
    00118     len = ntohs(IPH_LEN(iphdr)) - offset * 4 - IP_HLEN;
    00119     if(len != 0 || flags[0] != '.') {
    00120       fprintf(file, "%s %lu:%lu(%u) ",
    00121               flags,
    00122               ntohl(tcphdr->seqno),
    00123               ntohl(tcphdr->seqno) + len,
    00124               len);
    00125     }
    00126     if(TCPH_FLAGS(tcphdr) & TCP_ACK) {
    00127       fprintf(file, "ack %lu ",
    00128               ntohl(tcphdr->ackno));
    00129     }
    00130     fprintf(file, "wnd %u\n",
    00131             ntohs(tcphdr->wnd));
    00132
    00133     fflush(file);
    00134
    00135     pbuf_header(p, IP_HLEN);
    00136     break;
    00137
    00138   case IP_PROTO_UDP:
    00139     udphdr = (struct udp_hdr *)((char *)iphdr + IP_HLEN);
    00140
    00141     pbuf_header(p, -IP_HLEN);
    00142     if(inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
    00143                           (struct ip_addr *)&(iphdr->dest),
    00144                           IP_PROTO_UDP, p->tot_len) != 0) {
    00145       kprintf("tcpdump: IP checksum failed!\n");
    00146       fprintf(file, "!chksum ");
    00147     }
    00148
    00149     fprintf(file, "%d.%d.%d.%d.%u > %d.%d.%d.%d.%u: ",
    00150             (int)(ntohl(iphdr->src.addr) >> 24) & 0xff,
    00151             (int)(ntohl(iphdr->src.addr) >> 16) & 0xff,
    00152             (int)(ntohl(iphdr->src.addr) >> 8) & 0xff,
    00153             (int)(ntohl(iphdr->src.addr) >> 0) & 0xff,
    00154             ntohs(udphdr->src),
    00155           (int)(ntohl(iphdr->dest.addr) >> 24) & 0xff,
    00156             (int)(ntohl(iphdr->dest.addr) >> 16) & 0xff,
    00157             (int)(ntohl(iphdr->dest.addr) >> 8) & 0xff,
    00158             (int)(ntohl(iphdr->dest.addr) >> 0) & 0xff,
    00159             ntohs(udphdr->dest));
    00160     fprintf(file, "U ");
    00161     len = ntohs(IPH_LEN(iphdr)) - sizeof(struct udp_hdr) - IP_HLEN;
    00162     fprintf(file, " %d\n", len);
    00163
    00164     fflush(file);
    00165
    00166     pbuf_header(p, IP_HLEN);
    00167     break;
    00168
    00169   }
    00170   */
    00171   }
    00172
    00173 /***
    00174  END
    00175  ***/
    00176