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<h1>lib/socket.c</h1> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * lib/socket.c Netlink Socket Handle</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment"> * License as published by the Free Software Foundation version 2.1</span>
<a name="l00007"></a>00007 <span class="comment"> * of the License.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch></span>
<a name="l00010"></a>00010 <span class="comment"> */</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment">/**</span>
<a name="l00013"></a>00013 <span class="comment"> * @ingroup nl</span>
<a name="l00014"></a>00014 <span class="comment"> * @defgroup socket Socket</span>
<a name="l00015"></a>00015 <span class="comment"> * @brief Handle representing a netlink socket.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * The socket is represented in a structure called the netlink handle,</span>
<a name="l00018"></a>00018 <span class="comment"> * besides the socket, it stores various settings and values related</span>
<a name="l00019"></a>00019 <span class="comment"> * to the socket. Every socket handle has a mandatory association with</span>
<a name="l00020"></a>00020 <span class="comment"> * a set of callbacks which can be used to modify the behaviour when</span>
<a name="l00021"></a>00021 <span class="comment"> * sending/receiving data from the socket.</span>
<a name="l00022"></a>00022 <span class="comment"> *</span>
<a name="l00023"></a>00023 <span class="comment"> * @par Socket Attributes</span>
<a name="l00024"></a>00024 <span class="comment"> * - \b Local \b Port: The local port is a netlink port identifying the</span>
<a name="l00025"></a>00025 <span class="comment"> * local endpoint. It is used as source address for outgoing messages</span>
<a name="l00026"></a>00026 <span class="comment"> * and will be addressed in replies. It must therefore be unique among</span>
<a name="l00027"></a>00027 <span class="comment"> * all userspace applications. When the socket handle is allocated, a</span>
<a name="l00028"></a>00028 <span class="comment"> * unique port number is generated automatically in the form of 22 bits</span>
<a name="l00029"></a>00029 <span class="comment"> * Process Identifier + 10 bits Arbitary Number. Therefore the library</span>
<a name="l00030"></a>00030 <span class="comment"> * is capable of generating 1024 unique local port numbers for every</span>
<a name="l00031"></a>00031 <span class="comment"> * process. If more sockets are required, the application has to manage</span>
<a name="l00032"></a>00032 <span class="comment"> * port numbers itself using nl_socket_set_local_port().</span>
<a name="l00033"></a>00033 <span class="comment"> * - \b Group \b Subscriptions: A socket can subscribe to any number of</span>
<a name="l00034"></a>00034 <span class="comment"> * multicast groups. It will then receive a copy of all messages sent</span>
<a name="l00035"></a>00035 <span class="comment"> * to one of the groups. This method is mainly used for event notification.</span>
<a name="l00036"></a>00036 <span class="comment"> * Prior to kernel 2.6.14, the group subscription was done via bitmask</span>
<a name="l00037"></a>00037 <span class="comment"> * which limited to a total number of groups of 32. With 2.6.14 a new</span>
<a name="l00038"></a>00038 <span class="comment"> * method was added based on continous identifiers which supports an</span>
<a name="l00039"></a>00039 <span class="comment"> * arbitary number of groups. Both methods are supported, see</span>
<a name="l00040"></a>00040 <span class="comment"> * nl_join_groups() respectively nl_socket_add_membership() and</span>
<a name="l00041"></a>00041 <span class="comment"> * nl_socket_drop_membership().</span>
<a name="l00042"></a>00042 <span class="comment"> * - \b Peer \b Port: The peer port is a netlink port identifying the</span>
<a name="l00043"></a>00043 <span class="comment"> * peer's endpoint. If no peer port is specified, the kernel will try to</span>
<a name="l00044"></a>00044 <span class="comment"> * autobind to a socket of the specified netlink family automatically.</span>
<a name="l00045"></a>00045 <span class="comment"> * This is very common as typically only one listening socket exists</span>
<a name="l00046"></a>00046 <span class="comment"> * on the kernel side. The peer port can be modified using</span>
<a name="l00047"></a>00047 <span class="comment"> * nl_socket_set_peer_port().</span>
<a name="l00048"></a>00048 <span class="comment"> * - \b Peer \b Groups:</span>
<a name="l00049"></a>00049 <span class="comment"> * - \b File \b Descriptor: The file descriptor of the socket, it can be</span>
<a name="l00050"></a>00050 <span class="comment"> * accessed via nl_socket_get_fd() to change socket options or monitor</span>
<a name="l00051"></a>00051 <span class="comment"> * activity using poll()/select().</span>
<a name="l00052"></a>00052 <span class="comment"> * - \b Protocol: Once connected, the socket is bound to stick to one</span>
<a name="l00053"></a>00053 <span class="comment"> * netlink family. This field is invisible, it is maintained automatically.</span>
<a name="l00054"></a>00054 <span class="comment"> * (See nl_connect())</span>
<a name="l00055"></a>00055 <span class="comment"> * - \b Next \b Sequence \b Number: Next available sequence number to be used</span>
<a name="l00056"></a>00056 <span class="comment"> * for the next message being sent out. (Initial value: UNIX time when the</span>
<a name="l00057"></a>00057 <span class="comment"> * socket was allocated.) Sequence numbers can be used via</span>
<a name="l00058"></a>00058 <span class="comment"> * nl_socket_use_seq().</span>
<a name="l00059"></a>00059 <span class="comment"> * - \b Expected \b Sequence \b Number: Expected sequence number in the next</span>
<a name="l00060"></a>00060 <span class="comment"> * message received from the socket. (Initial value: Equal to next sequence</span>
<a name="l00061"></a>00061 <span class="comment"> * number.)</span>
<a name="l00062"></a>00062 <span class="comment"> * - \b Callbacks \b Configuration:</span>
<a name="l00063"></a>00063 <span class="comment"> *</span>
<a name="l00064"></a>00064 <span class="comment"> * @par 1) Creating the netlink handle</span>
<a name="l00065"></a>00065 <span class="comment"> * @code</span>
<a name="l00066"></a>00066 <span class="comment"> * struct nl_handle *handle;</span>
<a name="l00067"></a>00067 <span class="comment"> *</span>
<a name="l00068"></a>00068 <span class="comment"> * // Allocate and initialize a new netlink handle</span>
<a name="l00069"></a>00069 <span class="comment"> * handle = nl_handle_alloc();</span>
<a name="l00070"></a>00070 <span class="comment"> *</span>
<a name="l00071"></a>00071 <span class="comment"> * // Use nl_socket_get_fd() to fetch the file description, for example to</span>
<a name="l00072"></a>00072 <span class="comment"> * // put a socket into non-blocking i/o mode.</span>
<a name="l00073"></a>00073 <span class="comment"> * fcntl(nl_socket_get_fd(handle), F_SETFL, O_NONBLOCK);</span>
<a name="l00074"></a>00074 <span class="comment"> * @endcode</span>
<a name="l00075"></a>00075 <span class="comment"> *</span>
<a name="l00076"></a>00076 <span class="comment"> * @par 2) Group Subscriptions</span>
<a name="l00077"></a>00077 <span class="comment"> * @code</span>
<a name="l00078"></a>00078 <span class="comment"> * // Event notifications are typically sent to multicast addresses which</span>
<a name="l00079"></a>00079 <span class="comment"> * // represented by groups. Join a group to f.e. receive link notifications.</span>
<a name="l00080"></a>00080 <span class="comment"> * nl_socket_add_membership(handle, RTNLGRP_LINK);</span>
<a name="l00081"></a>00081 <span class="comment"> * @endcode</span>
<a name="l00082"></a>00082 <span class="comment"> *</span>
<a name="l00083"></a>00083 <span class="comment"> * @par 6) Cleaning up</span>
<a name="l00084"></a>00084 <span class="comment"> * @code</span>
<a name="l00085"></a>00085 <span class="comment"> * // Finally destroy the netlink handle</span>
<a name="l00086"></a>00086 <span class="comment"> * nl_handle_destroy(handle);</span>
<a name="l00087"></a>00087 <span class="comment"> * @endcode</span>
<a name="l00088"></a>00088 <span class="comment"> * </span>
<a name="l00089"></a>00089 <span class="comment"> * @{</span>
<a name="l00090"></a>00090 <span class="comment"> */</span>
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="preprocessor">#include <pthread.h></span>
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="preprocessor">#include <netlink-local.h></span>
<a name="l00095"></a>00095 <span class="preprocessor">#include <netlink/netlink.h></span>
<a name="l00096"></a>00096 <span class="preprocessor">#include <netlink/utils.h></span>
<a name="l00097"></a>00097 <span class="preprocessor">#include <netlink/handlers.h></span>
<a name="l00098"></a>00098 <span class="preprocessor">#include <netlink/msg.h></span>
<a name="l00099"></a>00099 <span class="preprocessor">#include <netlink/attr.h></span>
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="keyword">static</span> <span class="keywordtype">int</span> default_cb = <a class="code" href="group__cb.html#ggaba3fabad0c62db483941101e1a18d14da07baae9c246d899cffd1ad49d7c001ce" title="Default handlers (quiet)">NL_CB_DEFAULT</a>;
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="keyword">static</span> <span class="keywordtype">void</span> __init init_default_cb(<span class="keywordtype">void</span>)
<a name="l00104"></a>00104 {
<a name="l00105"></a>00105 <span class="keywordtype">char</span> *nlcb;
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="keywordflow">if</span> ((nlcb = getenv(<span class="stringliteral">"NLCB"</span>))) {
<a name="l00108"></a>00108 <span class="keywordflow">if</span> (!strcasecmp(nlcb, <span class="stringliteral">"default"</span>))
<a name="l00109"></a>00109 default_cb = <a class="code" href="group__cb.html#ggaba3fabad0c62db483941101e1a18d14da07baae9c246d899cffd1ad49d7c001ce" title="Default handlers (quiet)">NL_CB_DEFAULT</a>;
<a name="l00110"></a>00110 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcasecmp(nlcb, <span class="stringliteral">"verbose"</span>))
<a name="l00111"></a>00111 default_cb = <a class="code" href="group__cb.html#ggaba3fabad0c62db483941101e1a18d14dab2756e6194ec2c53efe5d111093b4375" title="Verbose default handlers (error messages printed)">NL_CB_VERBOSE</a>;
<a name="l00112"></a>00112 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcasecmp(nlcb, <span class="stringliteral">"debug"</span>))
<a name="l00113"></a>00113 default_cb = <a class="code" href="group__cb.html#ggaba3fabad0c62db483941101e1a18d14dad2ef3f2dbf45519610f72b3747eacd18" title="Debug handlers for debugging.">NL_CB_DEBUG</a>;
<a name="l00114"></a>00114 <span class="keywordflow">else</span> {
<a name="l00115"></a>00115 fprintf(stderr, <span class="stringliteral">"Unknown value for NLCB, valid values: "</span>
<a name="l00116"></a>00116 <span class="stringliteral">"{default | verbose | debug}\n"</span>);
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="keyword">static</span> uint32_t used_ports_map[32];
<a name="l00122"></a>00122 <span class="keyword">static</span> pthread_mutex_t port_map_mutex = PTHREAD_MUTEX_INITIALIZER;
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="keyword">static</span> uint32_t generate_local_port(<span class="keywordtype">void</span>)
<a name="l00125"></a>00125 {
<a name="l00126"></a>00126 <span class="keywordtype">int</span> i, n;
<a name="l00127"></a>00127 uint32_t pid = getpid() & 0x3FFFFF;
<a name="l00128"></a>00128
<a name="l00129"></a>00129 pthread_mutex_lock(&port_map_mutex);
<a name="l00130"></a>00130
<a name="l00131"></a>00131 <span class="keywordflow">for</span> (i = 0; i < 32; i++) {
<a name="l00132"></a>00132 <span class="keywordflow">if</span> (used_ports_map[i] == 0xFFFFFFFF)
<a name="l00133"></a>00133 <span class="keywordflow">continue</span>;
<a name="l00134"></a>00134
<a name="l00135"></a>00135 <span class="keywordflow">for</span> (n = 0; n < 32; n++) {
<a name="l00136"></a>00136 <span class="keywordflow">if</span> (1UL & (used_ports_map[i] >> n))
<a name="l00137"></a>00137 <span class="keywordflow">continue</span>;
<a name="l00138"></a>00138
<a name="l00139"></a>00139 used_ports_map[i] |= (1UL << n);
<a name="l00140"></a>00140 n += (i * 32);
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="comment">/* PID_MAX_LIMIT is currently at 2^22, leaving 10 bit</span>
<a name="l00143"></a>00143 <span class="comment"> * to, i.e. 1024 unique ports per application. */</span>
<a name="l00144"></a>00144
<a name="l00145"></a>00145 pthread_mutex_unlock(&port_map_mutex);
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="keywordflow">return</span> pid + (n << 22);
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150
<a name="l00151"></a>00151 pthread_mutex_unlock(&port_map_mutex);
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="comment">/* Out of sockets in our own PID namespace, what to do? FIXME */</span>
<a name="l00154"></a>00154 <span class="keywordflow">return</span> UINT_MAX;
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156
<a name="l00157"></a>00157 <span class="keyword">static</span> <span class="keywordtype">void</span> release_local_port(uint32_t port)
<a name="l00158"></a>00158 {
<a name="l00159"></a>00159 <span class="keywordtype">int</span> nr;
<a name="l00160"></a>00160
<a name="l00161"></a>00161 <span class="keywordflow">if</span> (port == UINT_MAX)
<a name="l00162"></a>00162 <span class="keywordflow">return</span>;
<a name="l00163"></a>00163
<a name="l00164"></a>00164 nr = port >> 22;
<a name="l00165"></a>00165
<a name="l00166"></a>00166 pthread_mutex_lock(&port_map_mutex);
<a name="l00167"></a>00167 used_ports_map[nr / 32] &= ~(1 << (nr % 32));
<a name="l00168"></a>00168 pthread_mutex_unlock(&port_map_mutex);
<a name="l00169"></a>00169 }
<a name="l00170"></a>00170 <span class="comment"></span>
<a name="l00171"></a>00171 <span class="comment">/**</span>
<a name="l00172"></a>00172 <span class="comment"> * @name Allocation</span>
<a name="l00173"></a>00173 <span class="comment"> * @{</span>
<a name="l00174"></a>00174 <span class="comment"> */</span>
<a name="l00175"></a>00175
<a name="l00176"></a>00176 <span class="keyword">static</span> <span class="keyword">struct </span>nl_handle *__alloc_handle(<span class="keyword">struct</span> nl_cb *cb)
<a name="l00177"></a>00177 {
<a name="l00178"></a>00178 <span class="keyword">struct </span>nl_handle *handle;
<a name="l00179"></a>00179
<a name="l00180"></a>00180 handle = calloc(1, <span class="keyword">sizeof</span>(*handle));
<a name="l00181"></a>00181 <span class="keywordflow">if</span> (!handle) {
<a name="l00182"></a>00182 nl_errno(ENOMEM);
<a name="l00183"></a>00183 <span class="keywordflow">return</span> NULL;
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185
<a name="l00186"></a>00186 handle->h_fd = -1;
<a name="l00187"></a>00187 handle->h_cb = cb;
<a name="l00188"></a>00188 handle->h_local.nl_family = AF_NETLINK;
<a name="l00189"></a>00189 handle->h_peer.nl_family = AF_NETLINK;
<a name="l00190"></a>00190 handle->h_seq_expect = handle->h_seq_next = time(0);
<a name="l00191"></a>00191 handle->h_local.nl_pid = generate_local_port();
<a name="l00192"></a>00192 <span class="keywordflow">if</span> (handle->h_local.nl_pid == UINT_MAX) {
<a name="l00193"></a>00193 <a class="code" href="group__socket.html#gaf73c4d1d895ec4cd19f504aae96219b5" title="Destroy netlink handle.">nl_handle_destroy</a>(handle);
<a name="l00194"></a>00194 nl_error(ENOBUFS, <span class="stringliteral">"Out of local ports"</span>);
<a name="l00195"></a>00195 <span class="keywordflow">return</span> NULL;
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197
<a name="l00198"></a>00198 <span class="keywordflow">return</span> handle;
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200 <span class="comment"></span>
<a name="l00201"></a>00201 <span class="comment">/**</span>
<a name="l00202"></a>00202 <span class="comment"> * Allocate new netlink socket handle.</span>
<a name="l00203"></a>00203 <span class="comment"> *</span>
<a name="l00204"></a>00204 <span class="comment"> * @return Newly allocated netlink socket handle or NULL.</span>
<a name="l00205"></a>00205 <span class="comment"> */</span>
<a name="l00206"></a><a class="code" href="group__socket.html#gaf903c9ea089735b1ba8e40dae801c47d">00206</a> <span class="keyword">struct </span>nl_handle *<a class="code" href="group__socket.html#gaf903c9ea089735b1ba8e40dae801c47d" title="Allocate new netlink socket handle.">nl_handle_alloc</a>(<span class="keywordtype">void</span>)
<a name="l00207"></a>00207 {
<a name="l00208"></a>00208 <span class="keyword">struct </span>nl_cb *cb;
<a name="l00209"></a>00209
<a name="l00210"></a>00210 cb = <a class="code" href="group__cb.html#gaea2e77b9e3c0c875f44aec236d9a1009" title="Allocate a new callback handle.">nl_cb_alloc</a>(default_cb);
<a name="l00211"></a>00211 <span class="keywordflow">if</span> (!cb) {
<a name="l00212"></a>00212 nl_errno(ENOMEM);
<a name="l00213"></a>00213 <span class="keywordflow">return</span> NULL;
<a name="l00214"></a>00214 }
<a name="l00215"></a>00215
<a name="l00216"></a>00216 <span class="keywordflow">return</span> __alloc_handle(cb);
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218 <span class="comment"></span>
<a name="l00219"></a>00219 <span class="comment">/**</span>
<a name="l00220"></a>00220 <span class="comment"> * Allocate new socket handle with custom callbacks</span>
<a name="l00221"></a>00221 <span class="comment"> * @arg cb Callback handler</span>
<a name="l00222"></a>00222 <span class="comment"> *</span>
<a name="l00223"></a>00223 <span class="comment"> * The reference to the callback handler is taken into account</span>
<a name="l00224"></a>00224 <span class="comment"> * automatically, it is released again upon calling nl_handle_destroy().</span>
<a name="l00225"></a>00225 <span class="comment"> *</span>
<a name="l00226"></a>00226 <span class="comment"> *@return Newly allocted socket handle or NULL.</span>
<a name="l00227"></a>00227 <span class="comment"> */</span>
<a name="l00228"></a><a class="code" href="group__socket.html#gaeae22da82a96561d9b89fb67763c258d">00228</a> <span class="keyword">struct </span>nl_handle *<a class="code" href="group__socket.html#gaeae22da82a96561d9b89fb67763c258d" title="Allocate new socket handle with custom callbacks.">nl_handle_alloc_cb</a>(<span class="keyword">struct</span> nl_cb *cb)
<a name="l00229"></a>00229 {
<a name="l00230"></a>00230 <span class="keywordflow">if</span> (cb == NULL)
<a name="l00231"></a>00231 BUG();
<a name="l00232"></a>00232
<a name="l00233"></a>00233 <span class="keywordflow">return</span> __alloc_handle(nl_cb_get(cb));
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235 <span class="comment"></span>
<a name="l00236"></a>00236 <span class="comment">/**</span>
<a name="l00237"></a>00237 <span class="comment"> * Destroy netlink handle.</span>
<a name="l00238"></a>00238 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00239"></a>00239 <span class="comment"> */</span>
<a name="l00240"></a><a class="code" href="group__socket.html#gaf73c4d1d895ec4cd19f504aae96219b5">00240</a> <span class="keywordtype">void</span> <a class="code" href="group__socket.html#gaf73c4d1d895ec4cd19f504aae96219b5" title="Destroy netlink handle.">nl_handle_destroy</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00241"></a>00241 {
<a name="l00242"></a>00242 <span class="keywordflow">if</span> (!handle)
<a name="l00243"></a>00243 <span class="keywordflow">return</span>;
<a name="l00244"></a>00244
<a name="l00245"></a>00245 <span class="keywordflow">if</span> (handle->h_fd >= 0)
<a name="l00246"></a>00246 close(handle->h_fd);
<a name="l00247"></a>00247
<a name="l00248"></a>00248 <span class="keywordflow">if</span> (!(handle->h_flags & NL_OWN_PORT))
<a name="l00249"></a>00249 release_local_port(handle->h_local.nl_pid);
<a name="l00250"></a>00250
<a name="l00251"></a>00251 nl_cb_put(handle->h_cb);
<a name="l00252"></a>00252 free(handle);
<a name="l00253"></a>00253 }
<a name="l00254"></a>00254 <span class="comment"></span>
<a name="l00255"></a>00255 <span class="comment">/** @} */</span>
<a name="l00256"></a>00256 <span class="comment"></span>
<a name="l00257"></a>00257 <span class="comment">/**</span>
<a name="l00258"></a>00258 <span class="comment"> * @name Sequence Numbers</span>
<a name="l00259"></a>00259 <span class="comment"> * @{</span>
<a name="l00260"></a>00260 <span class="comment"> */</span>
<a name="l00261"></a>00261
<a name="l00262"></a>00262 <span class="keyword">static</span> <span class="keywordtype">int</span> noop_seq_check(<span class="keyword">struct</span> nl_msg *msg, <span class="keywordtype">void</span> *arg)
<a name="l00263"></a>00263 {
<a name="l00264"></a>00264 <span class="keywordflow">return</span> <a class="code" href="group__cb.html#gga0c50cb29c507b3d7e8bc7d76c74675f8abce22d25ef3e2fed30f22f8bc27fc8f0" title="Proceed with wathever would come next.">NL_OK</a>;
<a name="l00265"></a>00265 }
<a name="l00266"></a>00266
<a name="l00267"></a>00267 <span class="comment"></span>
<a name="l00268"></a>00268 <span class="comment">/**</span>
<a name="l00269"></a>00269 <span class="comment"> * Disable sequence number checking.</span>
<a name="l00270"></a>00270 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00271"></a>00271 <span class="comment"> *</span>
<a name="l00272"></a>00272 <span class="comment"> * Disables checking of sequence numbers on the netlink handle. This is</span>
<a name="l00273"></a>00273 <span class="comment"> * required to allow messages to be processed which were not requested by</span>
<a name="l00274"></a>00274 <span class="comment"> * a preceding request message, e.g. netlink events.</span>
<a name="l00275"></a>00275 <span class="comment"> *</span>
<a name="l00276"></a>00276 <span class="comment"> * @note This function modifies the NL_CB_SEQ_CHECK configuration in</span>
<a name="l00277"></a>00277 <span class="comment"> * the callback handle associated with the socket.</span>
<a name="l00278"></a>00278 <span class="comment"> */</span>
<a name="l00279"></a><a class="code" href="group__socket.html#ga0ff2f43147e3a4547f7109578b3ca422">00279</a> <span class="keywordtype">void</span> <a class="code" href="group__socket.html#ga0ff2f43147e3a4547f7109578b3ca422" title="Disable sequence number checking.">nl_disable_sequence_check</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00280"></a>00280 {
<a name="l00281"></a>00281 <a class="code" href="group__cb.html#gabe7b2516f28fbb8bb9c5b1ea2dfaf1d3" title="Set up a callback.">nl_cb_set</a>(handle->h_cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363ae73e906b997f00e8911b09e0f254364d" title="Called instead of internal sequence number checking.">NL_CB_SEQ_CHECK</a>,
<a name="l00282"></a>00282 <a class="code" href="group__cb.html#ggaba3fabad0c62db483941101e1a18d14da22448271a402b4c4a55733ef4884c038" title="Customized handler specified by the user.">NL_CB_CUSTOM</a>, noop_seq_check, NULL);
<a name="l00283"></a>00283 }
<a name="l00284"></a>00284 <span class="comment"></span>
<a name="l00285"></a>00285 <span class="comment">/**</span>
<a name="l00286"></a>00286 <span class="comment"> * Use next sequence number</span>
<a name="l00287"></a>00287 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00288"></a>00288 <span class="comment"> *</span>
<a name="l00289"></a>00289 <span class="comment"> * Uses the next available sequence number and increases the counter</span>
<a name="l00290"></a>00290 <span class="comment"> * by one for subsequent calls.</span>
<a name="l00291"></a>00291 <span class="comment"> *</span>
<a name="l00292"></a>00292 <span class="comment"> * @return Unique serial sequence number</span>
<a name="l00293"></a>00293 <span class="comment"> */</span>
<a name="l00294"></a><a class="code" href="group__socket.html#ga92142abf81ef25b2518528dc9f82ce98">00294</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#ga92142abf81ef25b2518528dc9f82ce98" title="Use next sequence number.">nl_socket_use_seq</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00295"></a>00295 {
<a name="l00296"></a>00296 <span class="keywordflow">return</span> handle->h_seq_next++;
<a name="l00297"></a>00297 }
<a name="l00298"></a>00298 <span class="comment"></span>
<a name="l00299"></a>00299 <span class="comment">/** @} */</span>
<a name="l00300"></a>00300 <span class="comment"></span>
<a name="l00301"></a>00301 <span class="comment">/**</span>
<a name="l00302"></a>00302 <span class="comment"> * @name Source Idenficiation</span>
<a name="l00303"></a>00303 <span class="comment"> * @{</span>
<a name="l00304"></a>00304 <span class="comment"> */</span>
<a name="l00305"></a>00305
<a name="l00306"></a>00306 uint32_t nl_socket_get_local_port(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00307"></a>00307 {
<a name="l00308"></a>00308 <span class="keywordflow">return</span> handle->h_local.nl_pid;
<a name="l00309"></a>00309 }
<a name="l00310"></a>00310 <span class="comment"></span>
<a name="l00311"></a>00311 <span class="comment">/**</span>
<a name="l00312"></a>00312 <span class="comment"> * Set local port of socket</span>
<a name="l00313"></a>00313 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00314"></a>00314 <span class="comment"> * @arg port Local port identifier</span>
<a name="l00315"></a>00315 <span class="comment"> *</span>
<a name="l00316"></a>00316 <span class="comment"> * Assigns a local port identifier to the socket. If port is 0</span>
<a name="l00317"></a>00317 <span class="comment"> * a unique port identifier will be generated automatically.</span>
<a name="l00318"></a>00318 <span class="comment"> */</span>
<a name="l00319"></a><a class="code" href="group__socket.html#ga9cf7b89ddc00d1c9d7c0f00437c27e6b">00319</a> <span class="keywordtype">void</span> <a class="code" href="group__socket.html#ga9cf7b89ddc00d1c9d7c0f00437c27e6b" title="Set local port of socket.">nl_socket_set_local_port</a>(<span class="keyword">struct</span> nl_handle *handle, uint32_t port)
<a name="l00320"></a>00320 {
<a name="l00321"></a>00321 <span class="keywordflow">if</span> (port == 0) {
<a name="l00322"></a>00322 port = generate_local_port();
<a name="l00323"></a>00323 handle->h_flags &= ~NL_OWN_PORT;
<a name="l00324"></a>00324 } <span class="keywordflow">else</span> {
<a name="l00325"></a>00325 <span class="keywordflow">if</span> (!(handle->h_flags & NL_OWN_PORT))
<a name="l00326"></a>00326 release_local_port(handle->h_local.nl_pid);
<a name="l00327"></a>00327 handle->h_flags |= NL_OWN_PORT;
<a name="l00328"></a>00328 }
<a name="l00329"></a>00329
<a name="l00330"></a>00330 handle->h_local.nl_pid = port;
<a name="l00331"></a>00331 }
<a name="l00332"></a>00332 <span class="comment"></span>
<a name="l00333"></a>00333 <span class="comment">/** @} */</span>
<a name="l00334"></a>00334 <span class="comment"></span>
<a name="l00335"></a>00335 <span class="comment">/**</span>
<a name="l00336"></a>00336 <span class="comment"> * @name Group Subscriptions</span>
<a name="l00337"></a>00337 <span class="comment"> * @{</span>
<a name="l00338"></a>00338 <span class="comment"> */</span>
<a name="l00339"></a>00339 <span class="comment"></span>
<a name="l00340"></a>00340 <span class="comment">/**</span>
<a name="l00341"></a>00341 <span class="comment"> * Join a group</span>
<a name="l00342"></a>00342 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00343"></a>00343 <span class="comment"> * @arg group Group identifier</span>
<a name="l00344"></a>00344 <span class="comment"> *</span>
<a name="l00345"></a>00345 <span class="comment"> * Joins the specified group using the modern socket option which</span>
<a name="l00346"></a>00346 <span class="comment"> * is available since kernel version 2.6.14. It allows joining an</span>
<a name="l00347"></a>00347 <span class="comment"> * almost arbitary number of groups without limitation.</span>
<a name="l00348"></a>00348 <span class="comment"> *</span>
<a name="l00349"></a>00349 <span class="comment"> * Make sure to use the correct group definitions as the older</span>
<a name="l00350"></a>00350 <span class="comment"> * bitmask definitions for nl_join_groups() are likely to still</span>
<a name="l00351"></a>00351 <span class="comment"> * be present for backward compatibility reasons.</span>
<a name="l00352"></a>00352 <span class="comment"> *</span>
<a name="l00353"></a>00353 <span class="comment"> * @return 0 on sucess or a negative error code.</span>
<a name="l00354"></a>00354 <span class="comment"> */</span>
<a name="l00355"></a><a class="code" href="group__socket.html#ga3d0fb09feebd7fe9d919437aef47239a">00355</a> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#ga3d0fb09feebd7fe9d919437aef47239a" title="Join a group.">nl_socket_add_membership</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> group)
<a name="l00356"></a>00356 {
<a name="l00357"></a>00357 <span class="keywordtype">int</span> err;
<a name="l00358"></a>00358
<a name="l00359"></a>00359 <span class="keywordflow">if</span> (handle->h_fd == -1)
<a name="l00360"></a>00360 <span class="keywordflow">return</span> nl_error(EBADFD, <span class="stringliteral">"Socket not connected"</span>);
<a name="l00361"></a>00361
<a name="l00362"></a>00362 err = setsockopt(handle->h_fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
<a name="l00363"></a>00363 &group, <span class="keyword">sizeof</span>(group));
<a name="l00364"></a>00364 <span class="keywordflow">if</span> (err < 0)
<a name="l00365"></a>00365 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"setsockopt(NETLINK_ADD_MEMBERSHIP) "</span>
<a name="l00366"></a>00366 <span class="stringliteral">"failed"</span>);
<a name="l00367"></a>00367
<a name="l00368"></a>00368 <span class="keywordflow">return</span> 0;
<a name="l00369"></a>00369 }
<a name="l00370"></a>00370 <span class="comment"></span>
<a name="l00371"></a>00371 <span class="comment">/**</span>
<a name="l00372"></a>00372 <span class="comment"> * Leave a group</span>
<a name="l00373"></a>00373 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00374"></a>00374 <span class="comment"> * @arg group Group identifier</span>
<a name="l00375"></a>00375 <span class="comment"> *</span>
<a name="l00376"></a>00376 <span class="comment"> * Leaves the specified group using the modern socket option</span>
<a name="l00377"></a>00377 <span class="comment"> * which is available since kernel version 2.6.14.</span>
<a name="l00378"></a>00378 <span class="comment"> *</span>
<a name="l00379"></a>00379 <span class="comment"> * @see nl_socket_add_membership</span>
<a name="l00380"></a>00380 <span class="comment"> * @return 0 on success or a negative error code.</span>
<a name="l00381"></a>00381 <span class="comment"> */</span>
<a name="l00382"></a><a class="code" href="group__socket.html#ga0114b0736393662d10296a0480ebd49d">00382</a> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#ga0114b0736393662d10296a0480ebd49d" title="Leave a group.">nl_socket_drop_membership</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> group)
<a name="l00383"></a>00383 {
<a name="l00384"></a>00384 <span class="keywordtype">int</span> err;
<a name="l00385"></a>00385
<a name="l00386"></a>00386 <span class="keywordflow">if</span> (handle->h_fd == -1)
<a name="l00387"></a>00387 <span class="keywordflow">return</span> nl_error(EBADFD, <span class="stringliteral">"Socket not connected"</span>);
<a name="l00388"></a>00388
<a name="l00389"></a>00389 err = setsockopt(handle->h_fd, SOL_NETLINK, NETLINK_DROP_MEMBERSHIP,
<a name="l00390"></a>00390 &group, <span class="keyword">sizeof</span>(group));
<a name="l00391"></a>00391 <span class="keywordflow">if</span> (err < 0)
<a name="l00392"></a>00392 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"setsockopt(NETLINK_DROP_MEMBERSHIP) "</span>
<a name="l00393"></a>00393 <span class="stringliteral">"failed"</span>);
<a name="l00394"></a>00394
<a name="l00395"></a>00395 <span class="keywordflow">return</span> 0;
<a name="l00396"></a>00396 }
<a name="l00397"></a>00397 <span class="comment"></span>
<a name="l00398"></a>00398 <span class="comment">/**</span>
<a name="l00399"></a>00399 <span class="comment"> * Join multicast groups (deprecated)</span>
<a name="l00400"></a>00400 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00401"></a>00401 <span class="comment"> * @arg groups Bitmask of groups to join.</span>
<a name="l00402"></a>00402 <span class="comment"> *</span>
<a name="l00403"></a>00403 <span class="comment"> * This function defines the old way of joining multicast group which</span>
<a name="l00404"></a>00404 <span class="comment"> * has to be done prior to calling nl_connect(). It works on any kernel</span>
<a name="l00405"></a>00405 <span class="comment"> * version but is very limited as only 32 groups can be joined.</span>
<a name="l00406"></a>00406 <span class="comment"> */</span>
<a name="l00407"></a><a class="code" href="group__socket.html#gab6a2c1fb173efe3696184bdb2c5f5ae7">00407</a> <span class="keywordtype">void</span> <a class="code" href="group__socket.html#gab6a2c1fb173efe3696184bdb2c5f5ae7" title="Join multicast groups (deprecated)">nl_join_groups</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> groups)
<a name="l00408"></a>00408 {
<a name="l00409"></a>00409 handle->h_local.nl_groups |= groups;
<a name="l00410"></a>00410 }
<a name="l00411"></a>00411
<a name="l00412"></a>00412 <span class="comment"></span>
<a name="l00413"></a>00413 <span class="comment">/** @} */</span>
<a name="l00414"></a>00414 <span class="comment"></span>
<a name="l00415"></a>00415 <span class="comment">/**</span>
<a name="l00416"></a>00416 <span class="comment"> * @name Peer Identfication</span>
<a name="l00417"></a>00417 <span class="comment"> * @{</span>
<a name="l00418"></a>00418 <span class="comment"> */</span>
<a name="l00419"></a>00419
<a name="l00420"></a>00420 uint32_t nl_socket_get_peer_port(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00421"></a>00421 {
<a name="l00422"></a>00422 <span class="keywordflow">return</span> handle->h_peer.nl_pid;
<a name="l00423"></a>00423 }
<a name="l00424"></a>00424
<a name="l00425"></a>00425 <span class="keywordtype">void</span> nl_socket_set_peer_port(<span class="keyword">struct</span> nl_handle *handle, uint32_t port)
<a name="l00426"></a>00426 {
<a name="l00427"></a>00427 handle->h_peer.nl_pid = port;
<a name="l00428"></a>00428 }
<a name="l00429"></a>00429 <span class="comment"></span>
<a name="l00430"></a>00430 <span class="comment">/** @} */</span>
<a name="l00431"></a>00431 <span class="comment"></span>
<a name="l00432"></a>00432 <span class="comment">/**</span>
<a name="l00433"></a>00433 <span class="comment"> * @name File Descriptor</span>
<a name="l00434"></a>00434 <span class="comment"> * @{</span>
<a name="l00435"></a>00435 <span class="comment"> */</span>
<a name="l00436"></a>00436
<a name="l00437"></a>00437 <span class="keywordtype">int</span> nl_socket_get_fd(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00438"></a>00438 {
<a name="l00439"></a>00439 <span class="keywordflow">return</span> handle->h_fd;
<a name="l00440"></a>00440 }
<a name="l00441"></a>00441 <span class="comment"></span>
<a name="l00442"></a>00442 <span class="comment">/**</span>
<a name="l00443"></a>00443 <span class="comment"> * Set file descriptor of socket handle to non-blocking state</span>
<a name="l00444"></a>00444 <span class="comment"> * @arg handle Netlink socket</span>
<a name="l00445"></a>00445 <span class="comment"> *</span>
<a name="l00446"></a>00446 <span class="comment"> * @return 0 on success or a negative error code.</span>
<a name="l00447"></a>00447 <span class="comment"> */</span>
<a name="l00448"></a><a class="code" href="group__socket.html#gafbf20258be9d18116a9179c76cdd2637">00448</a> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#gafbf20258be9d18116a9179c76cdd2637" title="Set file descriptor of socket handle to non-blocking state.">nl_socket_set_nonblocking</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00449"></a>00449 {
<a name="l00450"></a>00450 <span class="keywordflow">if</span> (handle->h_fd == -1)
<a name="l00451"></a>00451 <span class="keywordflow">return</span> nl_error(EBADFD, <span class="stringliteral">"Socket not connected"</span>);
<a name="l00452"></a>00452
<a name="l00453"></a>00453 <span class="keywordflow">if</span> (fcntl(handle->h_fd, F_SETFL, O_NONBLOCK) < 0)
<a name="l00454"></a>00454 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"fcntl(F_SETFL, O_NONBLOCK) failed"</span>);
<a name="l00455"></a>00455
<a name="l00456"></a>00456 <span class="keywordflow">return</span> 0;
<a name="l00457"></a>00457 }
<a name="l00458"></a>00458 <span class="comment"></span>
<a name="l00459"></a>00459 <span class="comment">/**</span>
<a name="l00460"></a>00460 <span class="comment"> * Enable use of MSG_PEEK when reading from socket</span>
<a name="l00461"></a>00461 <span class="comment"> * @arg handle Netlink socket</span>
<a name="l00462"></a>00462 <span class="comment"> */</span>
<a name="l00463"></a><a class="code" href="group__socket.html#ga6dcc8125ee5726e240d8c04b2b83df2f">00463</a> <span class="keywordtype">void</span> <a class="code" href="group__socket.html#ga6dcc8125ee5726e240d8c04b2b83df2f" title="Enable use of MSG_PEEK when reading from socket.">nl_socket_enable_msg_peek</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00464"></a>00464 {
<a name="l00465"></a>00465 handle->h_flags |= NL_MSG_PEEK;
<a name="l00466"></a>00466 }
<a name="l00467"></a>00467 <span class="comment"></span>
<a name="l00468"></a>00468 <span class="comment">/**</span>
<a name="l00469"></a>00469 <span class="comment"> * Disable use of MSG_PEEK when reading from socket</span>
<a name="l00470"></a>00470 <span class="comment"> * @arg handle Netlink socket</span>
<a name="l00471"></a>00471 <span class="comment"> */</span>
<a name="l00472"></a><a class="code" href="group__socket.html#gaa385f5778249903909a0016f89044faa">00472</a> <span class="keywordtype">void</span> <a class="code" href="group__socket.html#gaa385f5778249903909a0016f89044faa" title="Disable use of MSG_PEEK when reading from socket.">nl_socket_disable_msg_peek</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00473"></a>00473 {
<a name="l00474"></a>00474 handle->h_flags &= ~NL_MSG_PEEK;
<a name="l00475"></a>00475 }
<a name="l00476"></a>00476 <span class="comment"></span>
<a name="l00477"></a>00477 <span class="comment">/** @} */</span>
<a name="l00478"></a>00478 <span class="comment"></span>
<a name="l00479"></a>00479 <span class="comment">/**</span>
<a name="l00480"></a>00480 <span class="comment"> * @name Callback Handler</span>
<a name="l00481"></a>00481 <span class="comment"> * @{</span>
<a name="l00482"></a>00482 <span class="comment"> */</span>
<a name="l00483"></a>00483
<a name="l00484"></a>00484 <span class="keyword">struct </span>nl_cb *nl_socket_get_cb(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00485"></a>00485 {
<a name="l00486"></a>00486 <span class="keywordflow">return</span> nl_cb_get(handle->h_cb);
<a name="l00487"></a>00487 }
<a name="l00488"></a>00488
<a name="l00489"></a>00489 <span class="keywordtype">void</span> nl_socket_set_cb(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> nl_cb *cb)
<a name="l00490"></a>00490 {
<a name="l00491"></a>00491 nl_cb_put(handle->h_cb);
<a name="l00492"></a>00492 handle->h_cb = nl_cb_get(cb);
<a name="l00493"></a>00493 }
<a name="l00494"></a>00494 <span class="comment"></span>
<a name="l00495"></a>00495 <span class="comment">/**</span>
<a name="l00496"></a>00496 <span class="comment"> * Modify the callback handler associated to the socket</span>
<a name="l00497"></a>00497 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00498"></a>00498 <span class="comment"> * @arg type which type callback to set</span>
<a name="l00499"></a>00499 <span class="comment"> * @arg kind kind of callback</span>
<a name="l00500"></a>00500 <span class="comment"> * @arg func callback function</span>
<a name="l00501"></a>00501 <span class="comment"> * @arg arg argument to be passwd to callback function</span>
<a name="l00502"></a>00502 <span class="comment"> *</span>
<a name="l00503"></a>00503 <span class="comment"> * @see nl_cb_set</span>
<a name="l00504"></a>00504 <span class="comment"> */</span>
<a name="l00505"></a><a class="code" href="group__socket.html#ga6ae4e46ad6ea991e92dd0cc2653ff371">00505</a> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#ga6ae4e46ad6ea991e92dd0cc2653ff371" title="Modify the callback handler associated to the socket.">nl_socket_modify_cb</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">enum</span> <a class="code" href="group__cb.html#ga3f60f4515ada826d2bf16395ee722363" title="Callback types.">nl_cb_type</a> type,
<a name="l00506"></a>00506 <span class="keyword">enum</span> <a class="code" href="group__cb.html#gaba3fabad0c62db483941101e1a18d14d" title="Callback kinds.">nl_cb_kind</a> kind, <a class="code" href="group__cb.html#ga1bf04ce17ab1b5867017556a6b4ba729" title="nl_recvmsgs() callback for message processing customization">nl_recvmsg_msg_cb_t</a> func,
<a name="l00507"></a>00507 <span class="keywordtype">void</span> *arg)
<a name="l00508"></a>00508 {
<a name="l00509"></a>00509 <span class="keywordflow">return</span> <a class="code" href="group__cb.html#gabe7b2516f28fbb8bb9c5b1ea2dfaf1d3" title="Set up a callback.">nl_cb_set</a>(handle->h_cb, type, kind, func, arg);
<a name="l00510"></a>00510 }
<a name="l00511"></a>00511 <span class="comment"></span>
<a name="l00512"></a>00512 <span class="comment">/** @} */</span>
<a name="l00513"></a>00513 <span class="comment"></span>
<a name="l00514"></a>00514 <span class="comment">/**</span>
<a name="l00515"></a>00515 <span class="comment"> * @name Utilities</span>
<a name="l00516"></a>00516 <span class="comment"> * @{</span>
<a name="l00517"></a>00517 <span class="comment"> */</span>
<a name="l00518"></a>00518 <span class="comment"></span>
<a name="l00519"></a>00519 <span class="comment">/**</span>
<a name="l00520"></a>00520 <span class="comment"> * Set socket buffer size of netlink handle.</span>
<a name="l00521"></a>00521 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00522"></a>00522 <span class="comment"> * @arg rxbuf New receive socket buffer size in bytes.</span>
<a name="l00523"></a>00523 <span class="comment"> * @arg txbuf New transmit socket buffer size in bytes.</span>
<a name="l00524"></a>00524 <span class="comment"> *</span>
<a name="l00525"></a>00525 <span class="comment"> * Sets the socket buffer size of a netlink handle to the specified</span>
<a name="l00526"></a>00526 <span class="comment"> * values \c rxbuf and \c txbuf. Providing a value of \c 0 assumes a</span>
<a name="l00527"></a>00527 <span class="comment"> * good default value.</span>
<a name="l00528"></a>00528 <span class="comment"> *</span>
<a name="l00529"></a>00529 <span class="comment"> * @note It is not required to call this function prior to nl_connect().</span>
<a name="l00530"></a>00530 <span class="comment"> * @return 0 on sucess or a negative error code.</span>
<a name="l00531"></a>00531 <span class="comment"> */</span>
<a name="l00532"></a><a class="code" href="group__socket.html#ga0b6d4741ee2ec8f0392b600a626ff1fd">00532</a> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#ga0b6d4741ee2ec8f0392b600a626ff1fd" title="Set socket buffer size of netlink handle.">nl_set_buffer_size</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> rxbuf, <span class="keywordtype">int</span> txbuf)
<a name="l00533"></a>00533 {
<a name="l00534"></a>00534 <span class="keywordtype">int</span> err;
<a name="l00535"></a>00535
<a name="l00536"></a>00536 <span class="keywordflow">if</span> (rxbuf <= 0)
<a name="l00537"></a>00537 rxbuf = 32768;
<a name="l00538"></a>00538
<a name="l00539"></a>00539 <span class="keywordflow">if</span> (txbuf <= 0)
<a name="l00540"></a>00540 txbuf = 32768;
<a name="l00541"></a>00541
<a name="l00542"></a>00542 <span class="keywordflow">if</span> (handle->h_fd == -1)
<a name="l00543"></a>00543 <span class="keywordflow">return</span> nl_error(EBADFD, <span class="stringliteral">"Socket not connected"</span>);
<a name="l00544"></a>00544
<a name="l00545"></a>00545 err = setsockopt(handle->h_fd, SOL_SOCKET, SO_SNDBUF,
<a name="l00546"></a>00546 &txbuf, <span class="keyword">sizeof</span>(txbuf));
<a name="l00547"></a>00547 <span class="keywordflow">if</span> (err < 0)
<a name="l00548"></a>00548 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"setsockopt(SO_SNDBUF) failed"</span>);
<a name="l00549"></a>00549
<a name="l00550"></a>00550 err = setsockopt(handle->h_fd, SOL_SOCKET, SO_RCVBUF,
<a name="l00551"></a>00551 &rxbuf, <span class="keyword">sizeof</span>(rxbuf));
<a name="l00552"></a>00552 <span class="keywordflow">if</span> (err < 0)
<a name="l00553"></a>00553 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"setsockopt(SO_RCVBUF) failed"</span>);
<a name="l00554"></a>00554
<a name="l00555"></a>00555 handle->h_flags |= NL_SOCK_BUFSIZE_SET;
<a name="l00556"></a>00556
<a name="l00557"></a>00557 <span class="keywordflow">return</span> 0;
<a name="l00558"></a>00558 }
<a name="l00559"></a>00559 <span class="comment"></span>
<a name="l00560"></a>00560 <span class="comment">/**</span>
<a name="l00561"></a>00561 <span class="comment"> * Enable/disable credential passing on netlink handle.</span>
<a name="l00562"></a>00562 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00563"></a>00563 <span class="comment"> * @arg state New state (0 - disabled, 1 - enabled)</span>
<a name="l00564"></a>00564 <span class="comment"> *</span>
<a name="l00565"></a>00565 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00566"></a>00566 <span class="comment"> */</span>
<a name="l00567"></a><a class="code" href="group__socket.html#ga4caab1fb14937565d7b38b57742a82ce">00567</a> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#ga4caab1fb14937565d7b38b57742a82ce" title="Enable/disable credential passing on netlink handle.">nl_set_passcred</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> state)
<a name="l00568"></a>00568 {
<a name="l00569"></a>00569 <span class="keywordtype">int</span> err;
<a name="l00570"></a>00570
<a name="l00571"></a>00571 <span class="keywordflow">if</span> (handle->h_fd == -1)
<a name="l00572"></a>00572 <span class="keywordflow">return</span> nl_error(EBADFD, <span class="stringliteral">"Socket not connected"</span>);
<a name="l00573"></a>00573
<a name="l00574"></a>00574 err = setsockopt(handle->h_fd, SOL_SOCKET, SO_PASSCRED,
<a name="l00575"></a>00575 &state, <span class="keyword">sizeof</span>(state));
<a name="l00576"></a>00576 <span class="keywordflow">if</span> (err < 0)
<a name="l00577"></a>00577 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"setsockopt(SO_PASSCRED) failed"</span>);
<a name="l00578"></a>00578
<a name="l00579"></a>00579 <span class="keywordflow">if</span> (state)
<a name="l00580"></a>00580 handle->h_flags |= NL_SOCK_PASSCRED;
<a name="l00581"></a>00581 <span class="keywordflow">else</span>
<a name="l00582"></a>00582 handle->h_flags &= ~NL_SOCK_PASSCRED;
<a name="l00583"></a>00583
<a name="l00584"></a>00584 <span class="keywordflow">return</span> 0;
<a name="l00585"></a>00585 }
<a name="l00586"></a>00586 <span class="comment"></span>
<a name="l00587"></a>00587 <span class="comment">/**</span>
<a name="l00588"></a>00588 <span class="comment"> * Enable/disable receival of additional packet information</span>
<a name="l00589"></a>00589 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00590"></a>00590 <span class="comment"> * @arg state New state (0 - disabled, 1 - enabled)</span>
<a name="l00591"></a>00591 <span class="comment"> *</span>
<a name="l00592"></a>00592 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00593"></a>00593 <span class="comment"> */</span>
<a name="l00594"></a><a class="code" href="group__socket.html#gaf2962e6065572d8da9a4cde6b7672f39">00594</a> <span class="keywordtype">int</span> <a class="code" href="group__socket.html#gaf2962e6065572d8da9a4cde6b7672f39" title="Enable/disable receival of additional packet information.">nl_socket_recv_pktinfo</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> state)
<a name="l00595"></a>00595 {
<a name="l00596"></a>00596 <span class="keywordtype">int</span> err;
<a name="l00597"></a>00597
<a name="l00598"></a>00598 <span class="keywordflow">if</span> (handle->h_fd == -1)
<a name="l00599"></a>00599 <span class="keywordflow">return</span> nl_error(EBADFD, <span class="stringliteral">"Socket not connected"</span>);
<a name="l00600"></a>00600
<a name="l00601"></a>00601 err = setsockopt(handle->h_fd, SOL_NETLINK, NETLINK_PKTINFO,
<a name="l00602"></a>00602 &state, <span class="keyword">sizeof</span>(state));
<a name="l00603"></a>00603 <span class="keywordflow">if</span> (err < 0)
<a name="l00604"></a>00604 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"setsockopt(NETLINK_PKTINFO) failed"</span>);
<a name="l00605"></a>00605
<a name="l00606"></a>00606 <span class="keywordflow">return</span> 0;
<a name="l00607"></a>00607 }
<a name="l00608"></a>00608 <span class="comment"></span>
<a name="l00609"></a>00609 <span class="comment">/** @} */</span>
<a name="l00610"></a>00610 <span class="comment"></span>
<a name="l00611"></a>00611 <span class="comment">/** @} */</span>
</pre></div></div>
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