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<h1>tcpdump.c</h1><a href="tcpdump_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2001, Swedish Institute of Computer Science.</span>
<a name="l00003"></a>00003 <span class="comment"> * All rights reserved. </span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without </span>
<a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the following conditions </span>
<a name="l00007"></a>00007 <span class="comment"> * are met: </span>
<a name="l00008"></a>00008 <span class="comment"> * 1. Redistributions of source code must retain the above copyright </span>
<a name="l00009"></a>00009 <span class="comment"> * notice, this list of conditions and the following disclaimer. </span>
<a name="l00010"></a>00010 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright </span>
<a name="l00011"></a>00011 <span class="comment"> * notice, this list of conditions and the following disclaimer in the </span>
<a name="l00012"></a>00012 <span class="comment"> * documentation and/or other materials provided with the distribution. </span>
<a name="l00013"></a>00013 <span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors </span>
<a name="l00014"></a>00014 <span class="comment"> * may be used to endorse or promote products derived from this software </span>
<a name="l00015"></a>00015 <span class="comment"> * without specific prior written permission. </span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND </span>
<a name="l00018"></a>00018 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE </span>
<a name="l00019"></a>00019 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE </span>
<a name="l00020"></a>00020 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE </span>
<a name="l00021"></a>00021 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL </span>
<a name="l00022"></a>00022 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS </span>
<a name="l00023"></a>00023 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) </span>
<a name="l00024"></a>00024 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT </span>
<a name="l00025"></a>00025 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY </span>
<a name="l00026"></a>00026 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF </span>
<a name="l00027"></a>00027 <span class="comment"> * SUCH DAMAGE. </span>
<a name="l00028"></a>00028 <span class="comment"> *</span>
<a name="l00029"></a>00029 <span class="comment"> * This file is part of the lwIP TCP/IP stack.</span>
<a name="l00030"></a>00030 <span class="comment"> * </span>
<a name="l00031"></a>00031 <span class="comment"> * Author: Adam Dunkels <adam@sics.se></span>
<a name="l00032"></a>00032 <span class="comment"> *</span>
<a name="l00033"></a>00033 <span class="comment"> * $Id: tcpdump_8c-source.html 88 2016-01-12 00:11:29Z reddawg $</span>
<a name="l00034"></a>00034 <span class="comment"> */</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="preprocessor">#include <<a class="code" href="file_8h.html">vfs/file.h</a>></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <<a class="code" href="kpanic_8h.html">ubixos/kpanic.h</a>></span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#include "<a class="code" href="tcpdump_8h.html">netif/tcpdump.h</a>"</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include "<a class="code" href="ipv4_2ip_8h.html">net/ipv4/ip.h</a>"</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include "<a class="code" href="tcp_8h.html">net/tcp.h</a>"</span>
<a name="l00042"></a>00042 <span class="preprocessor">#include "<a class="code" href="udp_8h.html">net/udp.h</a>"</span>
<a name="l00043"></a>00043 <span class="preprocessor">#include "<a class="code" href="ipv4_2inet_8h.html">net/ipv4/inet.h</a>"</span>
<a name="l00044"></a>00044
<a name="l00045"></a><a class="code" href="tcpdump_8c.html#03d2d7be521e9d357862075078d24f06">00045</a> <a class="code" href="structfileDescriptorStruct.html">fileDescriptor</a> *<a class="code" href="structfile.html">file</a> = <a class="code" href="def_8h.html#070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00046"></a>00046
<a name="l00047"></a><a class="code" href="tcpdump_8c.html#5a1493a11fbda3bb015f788583dfd3e4">00047</a> <span class="keywordtype">void</span> <a class="code" href="tcpdump_8h.html#5a1493a11fbda3bb015f788583dfd3e4">tcpdump_init</a>(<span class="keywordtype">void</span>) {
<a name="l00048"></a>00048 <span class="keywordtype">char</span> *fname;
<a name="l00049"></a>00049
<a name="l00050"></a>00050 fname = <span class="stringliteral">"tcpdump"</span>;
<a name="l00051"></a>00051 <a class="code" href="tcpdump_8c.html#03d2d7be521e9d357862075078d24f06">file</a> = <a class="code" href="file_8h.html#d6a41ac88a7d46d574e8a675fdde136c">fopen</a>(fname, <span class="stringliteral">"wb"</span>);
<a name="l00052"></a>00052 <span class="keywordflow">if</span>(<a class="code" href="tcpdump_8c.html#03d2d7be521e9d357862075078d24f06">file</a> == <a class="code" href="def_8h.html#070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00053"></a>00053 <a class="code" href="kpanic_8h.html#db9a182aa071791a306163d50d653deb">kpanic</a>(<span class="stringliteral">"tcpdump_init: fopen\n"</span>);
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056
<a name="l00057"></a><a class="code" href="tcpdump_8c.html#41214d30ddd3c36e32b4ac0914218c19">00057</a> <span class="keywordtype">void</span> <a class="code" href="tcpdump_8h.html#41214d30ddd3c36e32b4ac0914218c19">tcpdump</a>(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p) {
<a name="l00058"></a>00058 <span class="comment">/*</span>
<a name="l00059"></a>00059 <span class="comment"> struct ip_hdr *iphdr;</span>
<a name="l00060"></a>00060 <span class="comment"> struct tcp_hdr *tcphdr;</span>
<a name="l00061"></a>00061 <span class="comment"> struct udp_hdr *udphdr;</span>
<a name="l00062"></a>00062 <span class="comment"> char flags[5];</span>
<a name="l00063"></a>00063 <span class="comment"> int i;</span>
<a name="l00064"></a>00064 <span class="comment"> int len;</span>
<a name="l00065"></a>00065 <span class="comment"> int offset;</span>
<a name="l00066"></a>00066 <span class="comment">*/</span>
<a name="l00067"></a>00067 <span class="keywordflow">if</span> (<a class="code" href="tcpdump_8c.html#03d2d7be521e9d357862075078d24f06">file</a> == <a class="code" href="def_8h.html#070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00068"></a>00068 <span class="keywordflow">return</span>;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="comment">/*</span>
<a name="l00072"></a>00072 <span class="comment"> iphdr = p->payload;</span>
<a name="l00073"></a>00073 <span class="comment"> switch(IPH_PROTO(iphdr)) {</span>
<a name="l00074"></a>00074 <span class="comment"> case IP_PROTO_TCP: </span>
<a name="l00075"></a>00075 <span class="comment"> tcphdr = (struct tcp_hdr *)((char *)iphdr + IP_HLEN);</span>
<a name="l00076"></a>00076 <span class="comment"> </span>
<a name="l00077"></a>00077 <span class="comment"> pbuf_header(p, -IP_HLEN);</span>
<a name="l00078"></a>00078 <span class="comment"> if(inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),</span>
<a name="l00079"></a>00079 <span class="comment"> (struct ip_addr *)&(iphdr->dest),</span>
<a name="l00080"></a>00080 <span class="comment"> IP_PROTO_TCP, p->tot_len) != 0) {</span>
<a name="l00081"></a>00081 <span class="comment"> DEBUGF(TCPDUMP_DEBUG, ("tcpdump: IP checksum failed!\n"));</span>
<a name="l00082"></a>00082 <span class="comment"> fprintf(file, "!chksum ");</span>
<a name="l00083"></a>00083 <span class="comment"> }</span>
<a name="l00084"></a>00084 <span class="comment"> </span>
<a name="l00085"></a>00085 <span class="comment"> i = 0;</span>
<a name="l00086"></a>00086 <span class="comment"> if(TCPH_FLAGS(tcphdr) & TCP_SYN) {</span>
<a name="l00087"></a>00087 <span class="comment"> flags[i++] = 'S';</span>
<a name="l00088"></a>00088 <span class="comment"> }</span>
<a name="l00089"></a>00089 <span class="comment"> if(TCPH_FLAGS(tcphdr) & TCP_PSH) {</span>
<a name="l00090"></a>00090 <span class="comment"> flags[i++] = 'P';</span>
<a name="l00091"></a>00091 <span class="comment"> }</span>
<a name="l00092"></a>00092 <span class="comment"> if(TCPH_FLAGS(tcphdr) & TCP_FIN) {</span>
<a name="l00093"></a>00093 <span class="comment"> flags[i++] = 'F';</span>
<a name="l00094"></a>00094 <span class="comment"> }</span>
<a name="l00095"></a>00095 <span class="comment"> if(TCPH_FLAGS(tcphdr) & TCP_RST) {</span>
<a name="l00096"></a>00096 <span class="comment"> flags[i++] = 'R';</span>
<a name="l00097"></a>00097 <span class="comment"> }</span>
<a name="l00098"></a>00098 <span class="comment"> if(i == 0) {</span>
<a name="l00099"></a>00099 <span class="comment"> flags[i++] = '.';</span>
<a name="l00100"></a>00100 <span class="comment"> }</span>
<a name="l00101"></a>00101 <span class="comment"> flags[i++] = 0; </span>
<a name="l00102"></a>00102 <span class="comment"></span>
<a name="l00103"></a>00103 <span class="comment"> </span>
<a name="l00104"></a>00104 <span class="comment"> </span>
<a name="l00105"></a>00105 <span class="comment"> fprintf(file, "%d.%d.%d.%d.%u > %d.%d.%d.%d.%u: ",</span>
<a name="l00106"></a>00106 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 24) & 0xff,</span>
<a name="l00107"></a>00107 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 16) & 0xff,</span>
<a name="l00108"></a>00108 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 8) & 0xff,</span>
<a name="l00109"></a>00109 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 0) & 0xff,</span>
<a name="l00110"></a>00110 <span class="comment"> ntohs(tcphdr->src),</span>
<a name="l00111"></a>00111 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 24) & 0xff,</span>
<a name="l00112"></a>00112 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 16) & 0xff,</span>
<a name="l00113"></a>00113 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 8) & 0xff,</span>
<a name="l00114"></a>00114 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 0) & 0xff,</span>
<a name="l00115"></a>00115 <span class="comment"> ntohs(tcphdr->dest));</span>
<a name="l00116"></a>00116 <span class="comment"> offset = TCPH_OFFSET(tcphdr) >> 4;</span>
<a name="l00117"></a>00117 <span class="comment"> </span>
<a name="l00118"></a>00118 <span class="comment"> len = ntohs(IPH_LEN(iphdr)) - offset * 4 - IP_HLEN;</span>
<a name="l00119"></a>00119 <span class="comment"> if(len != 0 || flags[0] != '.') {</span>
<a name="l00120"></a>00120 <span class="comment"> fprintf(file, "%s %lu:%lu(%u) ",</span>
<a name="l00121"></a>00121 <span class="comment"> flags,</span>
<a name="l00122"></a>00122 <span class="comment"> ntohl(tcphdr->seqno),</span>
<a name="l00123"></a>00123 <span class="comment"> ntohl(tcphdr->seqno) + len,</span>
<a name="l00124"></a>00124 <span class="comment"> len);</span>
<a name="l00125"></a>00125 <span class="comment"> }</span>
<a name="l00126"></a>00126 <span class="comment"> if(TCPH_FLAGS(tcphdr) & TCP_ACK) {</span>
<a name="l00127"></a>00127 <span class="comment"> fprintf(file, "ack %lu ",</span>
<a name="l00128"></a>00128 <span class="comment"> ntohl(tcphdr->ackno));</span>
<a name="l00129"></a>00129 <span class="comment"> }</span>
<a name="l00130"></a>00130 <span class="comment"> fprintf(file, "wnd %u\n",</span>
<a name="l00131"></a>00131 <span class="comment"> ntohs(tcphdr->wnd));</span>
<a name="l00132"></a>00132 <span class="comment"> </span>
<a name="l00133"></a>00133 <span class="comment"> fflush(file);</span>
<a name="l00134"></a>00134 <span class="comment"> </span>
<a name="l00135"></a>00135 <span class="comment"> pbuf_header(p, IP_HLEN);</span>
<a name="l00136"></a>00136 <span class="comment"> break;</span>
<a name="l00137"></a>00137 <span class="comment"> </span>
<a name="l00138"></a>00138 <span class="comment"> case IP_PROTO_UDP: </span>
<a name="l00139"></a>00139 <span class="comment"> udphdr = (struct udp_hdr *)((char *)iphdr + IP_HLEN);</span>
<a name="l00140"></a>00140 <span class="comment"> </span>
<a name="l00141"></a>00141 <span class="comment"> pbuf_header(p, -IP_HLEN);</span>
<a name="l00142"></a>00142 <span class="comment"> if(inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),</span>
<a name="l00143"></a>00143 <span class="comment"> (struct ip_addr *)&(iphdr->dest),</span>
<a name="l00144"></a>00144 <span class="comment"> IP_PROTO_UDP, p->tot_len) != 0) {</span>
<a name="l00145"></a>00145 <span class="comment"> kprintf("tcpdump: IP checksum failed!\n");</span>
<a name="l00146"></a>00146 <span class="comment"> fprintf(file, "!chksum ");</span>
<a name="l00147"></a>00147 <span class="comment"> }</span>
<a name="l00148"></a>00148 <span class="comment"> </span>
<a name="l00149"></a>00149 <span class="comment"> fprintf(file, "%d.%d.%d.%d.%u > %d.%d.%d.%d.%u: ",</span>
<a name="l00150"></a>00150 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 24) & 0xff,</span>
<a name="l00151"></a>00151 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 16) & 0xff,</span>
<a name="l00152"></a>00152 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 8) & 0xff,</span>
<a name="l00153"></a>00153 <span class="comment"> (int)(ntohl(iphdr->src.addr) >> 0) & 0xff,</span>
<a name="l00154"></a>00154 <span class="comment"> ntohs(udphdr->src),</span>
<a name="l00155"></a>00155 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 24) & 0xff,</span>
<a name="l00156"></a>00156 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 16) & 0xff,</span>
<a name="l00157"></a>00157 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 8) & 0xff,</span>
<a name="l00158"></a>00158 <span class="comment"> (int)(ntohl(iphdr->dest.addr) >> 0) & 0xff,</span>
<a name="l00159"></a>00159 <span class="comment"> ntohs(udphdr->dest));</span>
<a name="l00160"></a>00160 <span class="comment"> fprintf(file, "U ");</span>
<a name="l00161"></a>00161 <span class="comment"> len = ntohs(IPH_LEN(iphdr)) - sizeof(struct udp_hdr) - IP_HLEN;</span>
<a name="l00162"></a>00162 <span class="comment"> fprintf(file, " %d\n", len);</span>
<a name="l00163"></a>00163 <span class="comment"> </span>
<a name="l00164"></a>00164 <span class="comment"> fflush(file);</span>
<a name="l00165"></a>00165 <span class="comment"> </span>
<a name="l00166"></a>00166 <span class="comment"> pbuf_header(p, IP_HLEN);</span>
<a name="l00167"></a>00167 <span class="comment"> break;</span>
<a name="l00168"></a>00168 <span class="comment"></span>
<a name="l00169"></a>00169 <span class="comment"> }</span>
<a name="l00170"></a>00170 <span class="comment"> */</span>
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172
<a name="l00173"></a>00173 <span class="comment">/***</span>
<a name="l00174"></a>00174 <span class="comment"> END</span>
<a name="l00175"></a>00175 <span class="comment"> ***/</span>
<a name="l00176"></a>00176
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Dec 12 08:52:07 2006 for UbixOS V2 by
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