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<h1>lib/nl.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/nl.c Core Netlink Interface</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"> * @defgroup nl Core Netlink API</span>
<a name="l00014"></a>00014 <span class="comment"> * @brief</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * @par Receiving Semantics</span>
<a name="l00017"></a>00017 <span class="comment"> * @code</span>
<a name="l00018"></a>00018 <span class="comment"> * nl_recvmsgs_default(socket)</span>
<a name="l00019"></a>00019 <span class="comment"> * |</span>
<a name="l00020"></a>00020 <span class="comment"> * | cb = nl_socket_get_cb(socket)</span>
<a name="l00021"></a>00021 <span class="comment"> * v</span>
<a name="l00022"></a>00022 <span class="comment"> * nl_recvmsgs(socket, cb)</span>
<a name="l00023"></a>00023 <span class="comment"> * | [Application provides nl_recvmsgs() replacement]</span>
<a name="l00024"></a>00024 <span class="comment"> * |- - - - - - - - - - - - - - - v</span>
<a name="l00025"></a>00025 <span class="comment"> * | cb->cb_recvmsgs_ow()</span>
<a name="l00026"></a>00026 <span class="comment"> * |</span>
<a name="l00027"></a>00027 <span class="comment"> * | [Application provides nl_recv() replacement]</span>
<a name="l00028"></a>00028 <span class="comment"> * +-------------->|- - - - - - - - - - - - - - - v</span>
<a name="l00029"></a>00029 <span class="comment"> * | nl_recv() cb->cb_recv_ow()</span>
<a name="l00030"></a>00030 <span class="comment"> * | +----------->|<- - - - - - - - - - - - - - -+</span>
<a name="l00031"></a>00031 <span class="comment"> * | | v</span>
<a name="l00032"></a>00032 <span class="comment"> * | | Parse Message</span>
<a name="l00033"></a>00033 <span class="comment"> * | | |- - - - - - - - - - - - - - - v</span>
<a name="l00034"></a>00034 <span class="comment"> * | | | NL_CB_MSG_IN()</span>
<a name="l00035"></a>00035 <span class="comment"> * | | |<- - - - - - - - - - - - - - -+</span>
<a name="l00036"></a>00036 <span class="comment"> * | | |</span>
<a name="l00037"></a>00037 <span class="comment"> * | | |- - - - - - - - - - - - - - - v</span>
<a name="l00038"></a>00038 <span class="comment"> * | | Sequence Check NL_CB_SEQ_CHECK()</span>
<a name="l00039"></a>00039 <span class="comment"> * | | |<- - - - - - - - - - - - - - -+</span>
<a name="l00040"></a>00040 <span class="comment"> * | | |</span>
<a name="l00041"></a>00041 <span class="comment"> * | | |- - - - - - - - - - - - - - - v [ NLM_F_ACK is set ]</span>
<a name="l00042"></a>00042 <span class="comment"> * | | | NL_CB_SEND_ACK()</span>
<a name="l00043"></a>00043 <span class="comment"> * | | |<- - - - - - - - - - - - - - -+</span>
<a name="l00044"></a>00044 <span class="comment"> * | | |</span>
<a name="l00045"></a>00045 <span class="comment"> * | | +-----+------+--------------+----------------+--------------+</span>
<a name="l00046"></a>00046 <span class="comment"> * | | v v v v v</span>
<a name="l00047"></a>00047 <span class="comment"> * | | Valid Message ACK NOOP Message End of Multipart Error Message</span>
<a name="l00048"></a>00048 <span class="comment"> * | | | | | | |</span>
<a name="l00049"></a>00049 <span class="comment"> * | | v v v v v</span>
<a name="l00050"></a>00050 <span class="comment"> * | |NL_CB_VALID() NL_CB_ACK() NL_CB_SKIPPED() NL_CB_FINISH() cb->cb_err()</span>
<a name="l00051"></a>00051 <span class="comment"> * | | | | | | |</span>
<a name="l00052"></a>00052 <span class="comment"> * | | +------------+--------------+----------------+ v</span>
<a name="l00053"></a>00053 <span class="comment"> * | | | (FAILURE)</span>
<a name="l00054"></a>00054 <span class="comment"> * | | | [Callback returned NL_SKIP]</span>
<a name="l00055"></a>00055 <span class="comment"> * | | [More messages to be parsed] |<-----------</span>
<a name="l00056"></a>00056 <span class="comment"> * | +----------------------------------|</span>
<a name="l00057"></a>00057 <span class="comment"> * | |</span>
<a name="l00058"></a>00058 <span class="comment"> * | [Multipart message] |</span>
<a name="l00059"></a>00059 <span class="comment"> * +-------------------------------------| [Callback returned NL_STOP]</span>
<a name="l00060"></a>00060 <span class="comment"> * |<-----------</span>
<a name="l00061"></a>00061 <span class="comment"> * v</span>
<a name="l00062"></a>00062 <span class="comment"> * (SUCCESS)</span>
<a name="l00063"></a>00063 <span class="comment"> *</span>
<a name="l00064"></a>00064 <span class="comment"> * At any time:</span>
<a name="l00065"></a>00065 <span class="comment"> * Message Format Error</span>
<a name="l00066"></a>00066 <span class="comment"> * |- - - - - - - - - - - - v</span>
<a name="l00067"></a>00067 <span class="comment"> * v NL_CB_INVALID()</span>
<a name="l00068"></a>00068 <span class="comment"> * (FAILURE)</span>
<a name="l00069"></a>00069 <span class="comment"> *</span>
<a name="l00070"></a>00070 <span class="comment"> * Message Overrun (Kernel Lost Data)</span>
<a name="l00071"></a>00071 <span class="comment"> * |- - - - - - - - - - - - v</span>
<a name="l00072"></a>00072 <span class="comment"> * v NL_CB_OVERRUN()</span>
<a name="l00073"></a>00073 <span class="comment"> * (FAILURE)</span>
<a name="l00074"></a>00074 <span class="comment"> *</span>
<a name="l00075"></a>00075 <span class="comment"> * Callback returned negative error code</span>
<a name="l00076"></a>00076 <span class="comment"> * (FAILURE)</span>
<a name="l00077"></a>00077 <span class="comment"> * @endcode</span>
<a name="l00078"></a>00078 <span class="comment"> *</span>
<a name="l00079"></a>00079 <span class="comment"> * @par Sending Semantics</span>
<a name="l00080"></a>00080 <span class="comment"> * @code</span>
<a name="l00081"></a>00081 <span class="comment"> * nl_send_auto_complete()</span>
<a name="l00082"></a>00082 <span class="comment"> * |</span>
<a name="l00083"></a>00083 <span class="comment"> * | Automatically fill in PID and/or sequence number</span>
<a name="l00084"></a>00084 <span class="comment"> * |</span>
<a name="l00085"></a>00085 <span class="comment"> * | [Application provides nl_send() replacement]</span>
<a name="l00086"></a>00086 <span class="comment"> * |- - - - - - - - - - - - - - - - - - - - v</span>
<a name="l00087"></a>00087 <span class="comment"> * v cb->cb_send_ow()</span>
<a name="l00088"></a>00088 <span class="comment"> * nl_send()</span>
<a name="l00089"></a>00089 <span class="comment"> * | Add destination address and credentials</span>
<a name="l00090"></a>00090 <span class="comment"> * v</span>
<a name="l00091"></a>00091 <span class="comment"> * nl_sendmsg()</span>
<a name="l00092"></a>00092 <span class="comment"> * | Set source address</span>
<a name="l00093"></a>00093 <span class="comment"> * |</span>
<a name="l00094"></a>00094 <span class="comment"> * |- - - - - - - - - - - - - - - - - - - - v</span>
<a name="l00095"></a>00095 <span class="comment"> * | NL_CB_MSG_OUT()</span>
<a name="l00096"></a>00096 <span class="comment"> * |<- - - - - - - - - - - - - - - - - - - -+</span>
<a name="l00097"></a>00097 <span class="comment"> * v</span>
<a name="l00098"></a>00098 <span class="comment"> * sendmsg()</span>
<a name="l00099"></a>00099 <span class="comment"> * @endcode</span>
<a name="l00100"></a>00100 <span class="comment"> *</span>
<a name="l00101"></a>00101 <span class="comment"> * @par 1) Connecting the socket</span>
<a name="l00102"></a>00102 <span class="comment"> * @code</span>
<a name="l00103"></a>00103 <span class="comment"> * // Bind and connect the socket to a protocol, NETLINK_ROUTE in this example.</span>
<a name="l00104"></a>00104 <span class="comment"> * nl_connect(handle, NETLINK_ROUTE);</span>
<a name="l00105"></a>00105 <span class="comment"> * @endcode</span>
<a name="l00106"></a>00106 <span class="comment"> *</span>
<a name="l00107"></a>00107 <span class="comment"> * @par 2) Sending data</span>
<a name="l00108"></a>00108 <span class="comment"> * @code</span>
<a name="l00109"></a>00109 <span class="comment"> * // The most rudimentary method is to use nl_sendto() simply pushing</span>
<a name="l00110"></a>00110 <span class="comment"> * // a piece of data to the other netlink peer. This method is not</span>
<a name="l00111"></a>00111 <span class="comment"> * // recommended.</span>
<a name="l00112"></a>00112 <span class="comment"> * const char buf[] = { 0x01, 0x02, 0x03, 0x04 };</span>
<a name="l00113"></a>00113 <span class="comment"> * nl_sendto(handle, buf, sizeof(buf));</span>
<a name="l00114"></a>00114 <span class="comment"> *</span>
<a name="l00115"></a>00115 <span class="comment"> * // A more comfortable interface is nl_send() taking a pointer to</span>
<a name="l00116"></a>00116 <span class="comment"> * // a netlink message.</span>
<a name="l00117"></a>00117 <span class="comment"> * struct nl_msg *msg = my_msg_builder();</span>
<a name="l00118"></a>00118 <span class="comment"> * nl_send(handle, nlmsg_hdr(msg));</span>
<a name="l00119"></a>00119 <span class="comment"> *</span>
<a name="l00120"></a>00120 <span class="comment"> * // nl_sendmsg() provides additional control over the sendmsg() message</span>
<a name="l00121"></a>00121 <span class="comment"> * // header in order to allow more specific addressing of multiple peers etc.</span>
<a name="l00122"></a>00122 <span class="comment"> * struct msghdr hdr = { ... };</span>
<a name="l00123"></a>00123 <span class="comment"> * nl_sendmsg(handle, nlmsg_hdr(msg), &hdr);</span>
<a name="l00124"></a>00124 <span class="comment"> *</span>
<a name="l00125"></a>00125 <span class="comment"> * // You're probably too lazy to fill out the netlink pid, sequence number</span>
<a name="l00126"></a>00126 <span class="comment"> * // and message flags all the time. nl_send_auto_complete() automatically</span>
<a name="l00127"></a>00127 <span class="comment"> * // extends your message header as needed with an appropriate sequence</span>
<a name="l00128"></a>00128 <span class="comment"> * // number, the netlink pid stored in the netlink handle and the message</span>
<a name="l00129"></a>00129 <span class="comment"> * // flags NLM_F_REQUEST and NLM_F_ACK</span>
<a name="l00130"></a>00130 <span class="comment"> * nl_send_auto_complete(handle, nlmsg_hdr(msg));</span>
<a name="l00131"></a>00131 <span class="comment"> *</span>
<a name="l00132"></a>00132 <span class="comment"> * // Simple protocols don't require the complex message construction interface</span>
<a name="l00133"></a>00133 <span class="comment"> * // and may favour nl_send_simple() to easly send a bunch of payload</span>
<a name="l00134"></a>00134 <span class="comment"> * // encapsulated in a netlink message header.</span>
<a name="l00135"></a>00135 <span class="comment"> * nl_send_simple(handle, MY_MSG_TYPE, 0, buf, sizeof(buf));</span>
<a name="l00136"></a>00136 <span class="comment"> * @endcode</span>
<a name="l00137"></a>00137 <span class="comment"> *</span>
<a name="l00138"></a>00138 <span class="comment"> * @par 3) Receiving data</span>
<a name="l00139"></a>00139 <span class="comment"> * @code</span>
<a name="l00140"></a>00140 <span class="comment"> * // nl_recv() receives a single message allocating a buffer for the message</span>
<a name="l00141"></a>00141 <span class="comment"> * // content and gives back the pointer to you.</span>
<a name="l00142"></a>00142 <span class="comment"> * struct sockaddr_nl peer;</span>
<a name="l00143"></a>00143 <span class="comment"> * unsigned char *msg;</span>
<a name="l00144"></a>00144 <span class="comment"> * nl_recv(handle, &peer, &msg);</span>
<a name="l00145"></a>00145 <span class="comment"> *</span>
<a name="l00146"></a>00146 <span class="comment"> * // nl_recvmsgs() receives a bunch of messages until the callback system</span>
<a name="l00147"></a>00147 <span class="comment"> * // orders it to state, usually after receving a compolete multi part</span>
<a name="l00148"></a>00148 <span class="comment"> * // message series.</span>
<a name="l00149"></a>00149 <span class="comment"> * nl_recvmsgs(handle, my_callback_configuration);</span>
<a name="l00150"></a>00150 <span class="comment"> *</span>
<a name="l00151"></a>00151 <span class="comment"> * // nl_recvmsgs_default() acts just like nl_recvmsg() but uses the callback</span>
<a name="l00152"></a>00152 <span class="comment"> * // configuration stored in the handle.</span>
<a name="l00153"></a>00153 <span class="comment"> * nl_recvmsgs_default(handle);</span>
<a name="l00154"></a>00154 <span class="comment"> *</span>
<a name="l00155"></a>00155 <span class="comment"> * // In case you want to wait for the ACK to be recieved that you requested</span>
<a name="l00156"></a>00156 <span class="comment"> * // with your latest message, you can call nl_wait_for_ack()</span>
<a name="l00157"></a>00157 <span class="comment"> * nl_wait_for_ack(handle);</span>
<a name="l00158"></a>00158 <span class="comment"> * @endcode</span>
<a name="l00159"></a>00159 <span class="comment"> *</span>
<a name="l00160"></a>00160 <span class="comment"> * @par 4) Closing</span>
<a name="l00161"></a>00161 <span class="comment"> * @code</span>
<a name="l00162"></a>00162 <span class="comment"> * // Close the socket first to release kernel memory</span>
<a name="l00163"></a>00163 <span class="comment"> * nl_close(handle);</span>
<a name="l00164"></a>00164 <span class="comment"> * @endcode</span>
<a name="l00165"></a>00165 <span class="comment"> * </span>
<a name="l00166"></a>00166 <span class="comment"> * @{</span>
<a name="l00167"></a>00167 <span class="comment"> */</span>
<a name="l00168"></a>00168
<a name="l00169"></a>00169 <span class="preprocessor">#include <netlink-local.h></span>
<a name="l00170"></a>00170 <span class="preprocessor">#include <netlink/netlink.h></span>
<a name="l00171"></a>00171 <span class="preprocessor">#include <netlink/utils.h></span>
<a name="l00172"></a>00172 <span class="preprocessor">#include <netlink/handlers.h></span>
<a name="l00173"></a>00173 <span class="preprocessor">#include <netlink/msg.h></span>
<a name="l00174"></a>00174 <span class="preprocessor">#include <netlink/attr.h></span>
<a name="l00175"></a>00175 <span class="comment"></span>
<a name="l00176"></a>00176 <span class="comment">/**</span>
<a name="l00177"></a>00177 <span class="comment"> * @name Connection Management</span>
<a name="l00178"></a>00178 <span class="comment"> * @{</span>
<a name="l00179"></a>00179 <span class="comment"> */</span>
<a name="l00180"></a>00180 <span class="comment"></span>
<a name="l00181"></a>00181 <span class="comment">/**</span>
<a name="l00182"></a>00182 <span class="comment"> * Create and connect netlink socket.</span>
<a name="l00183"></a>00183 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00184"></a>00184 <span class="comment"> * @arg protocol Netlink protocol to use.</span>
<a name="l00185"></a>00185 <span class="comment"> *</span>
<a name="l00186"></a>00186 <span class="comment"> * Creates a netlink socket using the specified protocol, binds the socket</span>
<a name="l00187"></a>00187 <span class="comment"> * and issues a connection attempt.</span>
<a name="l00188"></a>00188 <span class="comment"> *</span>
<a name="l00189"></a>00189 <span class="comment"> * @return 0 on success or a negative error code.</span>
<a name="l00190"></a>00190 <span class="comment"> */</span>
<a name="l00191"></a><a class="code" href="group__nl.html#ga68655d7fa8bd1944bec4761c95e576e9">00191</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#ga68655d7fa8bd1944bec4761c95e576e9" title="Create and connect netlink socket.">nl_connect</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> protocol)
<a name="l00192"></a>00192 {
<a name="l00193"></a>00193 <span class="keywordtype">int</span> err;
<a name="l00194"></a>00194 socklen_t addrlen;
<a name="l00195"></a>00195
<a name="l00196"></a>00196 handle->h_fd = socket(AF_NETLINK, SOCK_RAW, protocol);
<a name="l00197"></a>00197 <span class="keywordflow">if</span> (handle->h_fd < 0) {
<a name="l00198"></a>00198 err = nl_error(1, <span class="stringliteral">"socket(AF_NETLINK, ...) failed"</span>);
<a name="l00199"></a>00199 <span class="keywordflow">goto</span> errout;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="keywordflow">if</span> (!(handle->h_flags & NL_SOCK_BUFSIZE_SET)) {
<a name="l00203"></a>00203 err = <a class="code" href="group__socket.html#ga0b6d4741ee2ec8f0392b600a626ff1fd" title="Set socket buffer size of netlink handle.">nl_set_buffer_size</a>(handle, 0, 0);
<a name="l00204"></a>00204 <span class="keywordflow">if</span> (err < 0)
<a name="l00205"></a>00205 <span class="keywordflow">goto</span> errout;
<a name="l00206"></a>00206 }
<a name="l00207"></a>00207
<a name="l00208"></a>00208 err = bind(handle->h_fd, (<span class="keyword">struct</span> sockaddr*) &handle->h_local,
<a name="l00209"></a>00209 <span class="keyword">sizeof</span>(handle->h_local));
<a name="l00210"></a>00210 <span class="keywordflow">if</span> (err < 0) {
<a name="l00211"></a>00211 err = nl_error(1, <span class="stringliteral">"bind() failed"</span>);
<a name="l00212"></a>00212 <span class="keywordflow">goto</span> errout;
<a name="l00213"></a>00213 }
<a name="l00214"></a>00214
<a name="l00215"></a>00215 addrlen = <span class="keyword">sizeof</span>(handle->h_local);
<a name="l00216"></a>00216 err = getsockname(handle->h_fd, (<span class="keyword">struct</span> sockaddr *) &handle->h_local,
<a name="l00217"></a>00217 &addrlen);
<a name="l00218"></a>00218 <span class="keywordflow">if</span> (err < 0) {
<a name="l00219"></a>00219 err = nl_error(1, <span class="stringliteral">"getsockname failed"</span>);
<a name="l00220"></a>00220 <span class="keywordflow">goto</span> errout;
<a name="l00221"></a>00221 }
<a name="l00222"></a>00222
<a name="l00223"></a>00223 <span class="keywordflow">if</span> (addrlen != <span class="keyword">sizeof</span>(handle->h_local)) {
<a name="l00224"></a>00224 err = nl_error(EADDRNOTAVAIL, <span class="stringliteral">"Invalid address length"</span>);
<a name="l00225"></a>00225 <span class="keywordflow">goto</span> errout;
<a name="l00226"></a>00226 }
<a name="l00227"></a>00227
<a name="l00228"></a>00228 <span class="keywordflow">if</span> (handle->h_local.nl_family != AF_NETLINK) {
<a name="l00229"></a>00229 err = nl_error(EPFNOSUPPORT, <span class="stringliteral">"Address format not supported"</span>);
<a name="l00230"></a>00230 <span class="keywordflow">goto</span> errout;
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232
<a name="l00233"></a>00233 handle->h_proto = protocol;
<a name="l00234"></a>00234
<a name="l00235"></a>00235 <span class="keywordflow">return</span> 0;
<a name="l00236"></a>00236 errout:
<a name="l00237"></a>00237 close(handle->h_fd);
<a name="l00238"></a>00238 handle->h_fd = -1;
<a name="l00239"></a>00239
<a name="l00240"></a>00240 <span class="keywordflow">return</span> err;
<a name="l00241"></a>00241 }
<a name="l00242"></a>00242 <span class="comment"></span>
<a name="l00243"></a>00243 <span class="comment">/**</span>
<a name="l00244"></a>00244 <span class="comment"> * Close/Disconnect netlink socket.</span>
<a name="l00245"></a>00245 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00246"></a>00246 <span class="comment"> */</span>
<a name="l00247"></a><a class="code" href="group__nl.html#ga25039e93db5ab64ce4345ffe14379530">00247</a> <span class="keywordtype">void</span> <a class="code" href="group__nl.html#ga25039e93db5ab64ce4345ffe14379530" title="Close/Disconnect netlink socket.">nl_close</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00248"></a>00248 {
<a name="l00249"></a>00249 <span class="keywordflow">if</span> (handle->h_fd >= 0) {
<a name="l00250"></a>00250 close(handle->h_fd);
<a name="l00251"></a>00251 handle->h_fd = -1;
<a name="l00252"></a>00252 }
<a name="l00253"></a>00253
<a name="l00254"></a>00254 handle->h_proto = 0;
<a name="l00255"></a>00255 }
<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"></span>
<a name="l00259"></a>00259 <span class="comment">/**</span>
<a name="l00260"></a>00260 <span class="comment"> * @name Send</span>
<a name="l00261"></a>00261 <span class="comment"> * @{</span>
<a name="l00262"></a>00262 <span class="comment"> */</span>
<a name="l00263"></a>00263 <span class="comment"></span>
<a name="l00264"></a>00264 <span class="comment">/**</span>
<a name="l00265"></a>00265 <span class="comment"> * Send raw data over netlink socket.</span>
<a name="l00266"></a>00266 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00267"></a>00267 <span class="comment"> * @arg buf Data buffer.</span>
<a name="l00268"></a>00268 <span class="comment"> * @arg size Size of data buffer.</span>
<a name="l00269"></a>00269 <span class="comment"> * @return Number of characters written on success or a negative error code.</span>
<a name="l00270"></a>00270 <span class="comment"> */</span>
<a name="l00271"></a><a class="code" href="group__nl.html#ga53ee384f123fa3c354ad43adb6cf647d">00271</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#ga53ee384f123fa3c354ad43adb6cf647d" title="Send raw data over netlink socket.">nl_sendto</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">void</span> *buf, <span class="keywordtype">size_t</span> size)
<a name="l00272"></a>00272 {
<a name="l00273"></a>00273 <span class="keywordtype">int</span> ret;
<a name="l00274"></a>00274
<a name="l00275"></a>00275 ret = sendto(handle->h_fd, buf, size, 0, (<span class="keyword">struct</span> sockaddr *)
<a name="l00276"></a>00276 &handle->h_peer, <span class="keyword">sizeof</span>(handle->h_peer));
<a name="l00277"></a>00277 <span class="keywordflow">if</span> (ret < 0)
<a name="l00278"></a>00278 <span class="keywordflow">return</span> nl_errno(errno);
<a name="l00279"></a>00279
<a name="l00280"></a>00280 <span class="keywordflow">return</span> ret;
<a name="l00281"></a>00281 }
<a name="l00282"></a>00282 <span class="comment"></span>
<a name="l00283"></a>00283 <span class="comment">/**</span>
<a name="l00284"></a>00284 <span class="comment"> * Send netlink message with control over sendmsg() message header.</span>
<a name="l00285"></a>00285 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00286"></a>00286 <span class="comment"> * @arg msg Netlink message to be sent.</span>
<a name="l00287"></a>00287 <span class="comment"> * @arg hdr Sendmsg() message header.</span>
<a name="l00288"></a>00288 <span class="comment"> * @return Number of characters sent on sucess or a negative error code.</span>
<a name="l00289"></a>00289 <span class="comment"> */</span>
<a name="l00290"></a><a class="code" href="group__nl.html#gaf3dca993337ed2d60a42269eaab65585">00290</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#gaf3dca993337ed2d60a42269eaab65585" title="Send netlink message with control over sendmsg() message header.">nl_sendmsg</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> nl_msg *msg, <span class="keyword">struct</span> msghdr *hdr)
<a name="l00291"></a>00291 {
<a name="l00292"></a>00292 <span class="keyword">struct </span>nl_cb *cb;
<a name="l00293"></a>00293 <span class="keywordtype">int</span> ret;
<a name="l00294"></a>00294
<a name="l00295"></a>00295 <span class="keyword">struct </span>iovec iov = {
<a name="l00296"></a>00296 .iov_base = (<span class="keywordtype">void</span> *) <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg),
<a name="l00297"></a>00297 .iov_len = <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg)-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a>,
<a name="l00298"></a>00298 };
<a name="l00299"></a>00299
<a name="l00300"></a>00300 hdr->msg_iov = &iov;
<a name="l00301"></a>00301 hdr->msg_iovlen = 1;
<a name="l00302"></a>00302
<a name="l00303"></a>00303 nlmsg_set_src(msg, &handle->h_local);
<a name="l00304"></a>00304
<a name="l00305"></a>00305 cb = handle->h_cb;
<a name="l00306"></a>00306 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a0b43ab5eccae67470bb8ed0b09e2f650" title="Called for every message sent out except for nl_sendto()">NL_CB_MSG_OUT</a>])
<a name="l00307"></a>00307 <span class="keywordflow">if</span> (nl_cb_call(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a0b43ab5eccae67470bb8ed0b09e2f650" title="Called for every message sent out except for nl_sendto()">NL_CB_MSG_OUT</a>, msg) != <a class="code" href="group__cb.html#gga0c50cb29c507b3d7e8bc7d76c74675f8abce22d25ef3e2fed30f22f8bc27fc8f0" title="Proceed with wathever would come next.">NL_OK</a>)
<a name="l00308"></a>00308 <span class="keywordflow">return</span> 0;
<a name="l00309"></a>00309
<a name="l00310"></a>00310 ret = sendmsg(handle->h_fd, hdr, 0);
<a name="l00311"></a>00311 <span class="keywordflow">if</span> (ret < 0)
<a name="l00312"></a>00312 <span class="keywordflow">return</span> nl_errno(errno);
<a name="l00313"></a>00313
<a name="l00314"></a>00314 <span class="keywordflow">return</span> ret;
<a name="l00315"></a>00315 }
<a name="l00316"></a>00316
<a name="l00317"></a>00317 <span class="comment"></span>
<a name="l00318"></a>00318 <span class="comment">/**</span>
<a name="l00319"></a>00319 <span class="comment"> * Send netlink message.</span>
<a name="l00320"></a>00320 <span class="comment"> * @arg handle Netlink handle</span>
<a name="l00321"></a>00321 <span class="comment"> * @arg msg Netlink message to be sent.</span>
<a name="l00322"></a>00322 <span class="comment"> * @see nl_sendmsg()</span>
<a name="l00323"></a>00323 <span class="comment"> * @return Number of characters sent on success or a negative error code.</span>
<a name="l00324"></a>00324 <span class="comment"> */</span>
<a name="l00325"></a><a class="code" href="group__nl.html#ga5f3fff85c39f18946100c85f09d2c41c">00325</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#ga5f3fff85c39f18946100c85f09d2c41c" title="Send netlink message.">nl_send</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> nl_msg *msg)
<a name="l00326"></a>00326 {
<a name="l00327"></a>00327 <span class="keyword">struct </span><a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> *dst;
<a name="l00328"></a>00328 <span class="keyword">struct </span>ucred *creds;
<a name="l00329"></a>00329
<a name="l00330"></a>00330 <span class="keyword">struct </span>msghdr hdr = {
<a name="l00331"></a>00331 .msg_name = (<span class="keywordtype">void</span> *) &handle->h_peer,
<a name="l00332"></a>00332 .msg_namelen = <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a>),
<a name="l00333"></a>00333 };
<a name="l00334"></a>00334
<a name="l00335"></a>00335 <span class="comment">/* Overwrite destination if specified in the message itself, defaults</span>
<a name="l00336"></a>00336 <span class="comment"> * to the peer address of the handle.</span>
<a name="l00337"></a>00337 <span class="comment"> */</span>
<a name="l00338"></a>00338 dst = nlmsg_get_dst(msg);
<a name="l00339"></a>00339 <span class="keywordflow">if</span> (dst-><a class="code" href="structsockaddr__nl.html#a28df558ea904fe04840eb2a4ce4b779d" title="socket family (AF_NETLINK)">nl_family</a> == AF_NETLINK)
<a name="l00340"></a>00340 hdr.msg_name = dst;
<a name="l00341"></a>00341
<a name="l00342"></a>00342 <span class="comment">/* Add credentials if present. */</span>
<a name="l00343"></a>00343 creds = nlmsg_get_creds(msg);
<a name="l00344"></a>00344 <span class="keywordflow">if</span> (creds != NULL) {
<a name="l00345"></a>00345 <span class="keywordtype">char</span> buf[CMSG_SPACE(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> ucred))];
<a name="l00346"></a>00346 <span class="keyword">struct </span>cmsghdr *cmsg;
<a name="l00347"></a>00347
<a name="l00348"></a>00348 hdr.msg_control = buf;
<a name="l00349"></a>00349 hdr.msg_controllen = <span class="keyword">sizeof</span>(buf);
<a name="l00350"></a>00350
<a name="l00351"></a>00351 cmsg = CMSG_FIRSTHDR(&hdr);
<a name="l00352"></a>00352 cmsg->cmsg_level = SOL_SOCKET;
<a name="l00353"></a>00353 cmsg->cmsg_type = SCM_CREDENTIALS;
<a name="l00354"></a>00354 cmsg->cmsg_len = CMSG_LEN(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> ucred));
<a name="l00355"></a>00355 memcpy(CMSG_DATA(cmsg), creds, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ucred));
<a name="l00356"></a>00356 }
<a name="l00357"></a>00357
<a name="l00358"></a>00358 <span class="keywordflow">return</span> <a class="code" href="group__nl.html#gaf3dca993337ed2d60a42269eaab65585" title="Send netlink message with control over sendmsg() message header.">nl_sendmsg</a>(handle, msg, &hdr);
<a name="l00359"></a>00359 }
<a name="l00360"></a>00360 <span class="comment"></span>
<a name="l00361"></a>00361 <span class="comment">/**</span>
<a name="l00362"></a>00362 <span class="comment"> * Send netlink message and check & extend header values as needed.</span>
<a name="l00363"></a>00363 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00364"></a>00364 <span class="comment"> * @arg msg Netlink message to be sent.</span>
<a name="l00365"></a>00365 <span class="comment"> *</span>
<a name="l00366"></a>00366 <span class="comment"> * Checks the netlink message \c nlh for completness and extends it</span>
<a name="l00367"></a>00367 <span class="comment"> * as required before sending it out. Checked fields include pid,</span>
<a name="l00368"></a>00368 <span class="comment"> * sequence nr, and flags.</span>
<a name="l00369"></a>00369 <span class="comment"> *</span>
<a name="l00370"></a>00370 <span class="comment"> * @see nl_send()</span>
<a name="l00371"></a>00371 <span class="comment"> * @return Number of characters sent or a negative error code.</span>
<a name="l00372"></a>00372 <span class="comment"> */</span>
<a name="l00373"></a><a class="code" href="group__nl.html#ga01a2aad82350f867e704d5c696438b60">00373</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#ga01a2aad82350f867e704d5c696438b60" title="Send netlink message and check &amp; extend header values as needed.">nl_send_auto_complete</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> nl_msg *msg)
<a name="l00374"></a>00374 {
<a name="l00375"></a>00375 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *nlh;
<a name="l00376"></a>00376 <span class="keyword">struct </span>nl_cb *cb = handle->h_cb;
<a name="l00377"></a>00377
<a name="l00378"></a>00378 nlh = <a class="code" href="group__msg.html#gaa5f29579d86d2bdab26c312b44b56de7" title="Return actual netlink message.">nlmsg_hdr</a>(msg);
<a name="l00379"></a>00379 <span class="keywordflow">if</span> (nlh-><a class="code" href="structnlmsghdr.html#a071903f5e2400298bca69ac70500421f" title="Netlink PID of the proccess sending the message.">nlmsg_pid</a> == 0)
<a name="l00380"></a>00380 nlh-><a class="code" href="structnlmsghdr.html#a071903f5e2400298bca69ac70500421f" title="Netlink PID of the proccess sending the message.">nlmsg_pid</a> = handle->h_local.nl_pid;
<a name="l00381"></a>00381
<a name="l00382"></a>00382 <span class="keywordflow">if</span> (nlh-><a class="code" href="structnlmsghdr.html#ad6c6a7aa9de65bb2da498c84148be7e6" title="Sequence number.">nlmsg_seq</a> == 0)
<a name="l00383"></a>00383 nlh-><a class="code" href="structnlmsghdr.html#ad6c6a7aa9de65bb2da498c84148be7e6" title="Sequence number.">nlmsg_seq</a> = handle->h_seq_next++;
<a name="l00384"></a>00384
<a name="l00385"></a>00385 <span class="keywordflow">if</span> (msg->nm_protocol == -1)
<a name="l00386"></a>00386 msg->nm_protocol = handle->h_proto;
<a name="l00387"></a>00387
<a name="l00388"></a>00388 nlh-><a class="code" href="structnlmsghdr.html#abcf664d354ea35ebb9b3d8a50088fec6" title="Message flags.">nlmsg_flags</a> |= (<a class="code" href="group__msg.html#ga456954d27b8adedd78136a9511f13160" title="Must be set on all request messages (typically from user space to kernel space).">NLM_F_REQUEST</a> | <a class="code" href="group__msg.html#ga67d5b6ba8714b97d74df72d119351bee" title="Request for an acknowledgment on success.">NLM_F_ACK</a>);
<a name="l00389"></a>00389
<a name="l00390"></a>00390 <span class="keywordflow">if</span> (cb->cb_send_ow)
<a name="l00391"></a>00391 <span class="keywordflow">return</span> cb->cb_send_ow(handle, msg);
<a name="l00392"></a>00392 <span class="keywordflow">else</span>
<a name="l00393"></a>00393 <span class="keywordflow">return</span> <a class="code" href="group__nl.html#ga5f3fff85c39f18946100c85f09d2c41c" title="Send netlink message.">nl_send</a>(handle, msg);
<a name="l00394"></a>00394 }
<a name="l00395"></a>00395 <span class="comment"></span>
<a name="l00396"></a>00396 <span class="comment">/**</span>
<a name="l00397"></a>00397 <span class="comment"> * Send simple netlink message using nl_send_auto_complete()</span>
<a name="l00398"></a>00398 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00399"></a>00399 <span class="comment"> * @arg type Netlink message type.</span>
<a name="l00400"></a>00400 <span class="comment"> * @arg flags Netlink message flags.</span>
<a name="l00401"></a>00401 <span class="comment"> * @arg buf Data buffer.</span>
<a name="l00402"></a>00402 <span class="comment"> * @arg size Size of data buffer.</span>
<a name="l00403"></a>00403 <span class="comment"> *</span>
<a name="l00404"></a>00404 <span class="comment"> * Builds a netlink message with the specified type and flags and</span>
<a name="l00405"></a>00405 <span class="comment"> * appends the specified data as payload to the message.</span>
<a name="l00406"></a>00406 <span class="comment"> *</span>
<a name="l00407"></a>00407 <span class="comment"> * @see nl_send_auto_complete()</span>
<a name="l00408"></a>00408 <span class="comment"> * @return Number of characters sent on success or a negative error code.</span>
<a name="l00409"></a>00409 <span class="comment"> */</span>
<a name="l00410"></a><a class="code" href="group__nl.html#ga73ed88a505f2d67bcf328183fe1e692a">00410</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#ga73ed88a505f2d67bcf328183fe1e692a" title="Send simple netlink message using nl_send_auto_complete()">nl_send_simple</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keywordtype">int</span> type, <span class="keywordtype">int</span> flags, <span class="keywordtype">void</span> *buf,
<a name="l00411"></a>00411 <span class="keywordtype">size_t</span> size)
<a name="l00412"></a>00412 {
<a name="l00413"></a>00413 <span class="keywordtype">int</span> err;
<a name="l00414"></a>00414 <span class="keyword">struct </span>nl_msg *msg;
<a name="l00415"></a>00415
<a name="l00416"></a>00416 msg = <a class="code" href="group__msg.html#ga580d8697d19050c55060bc10ab4eae9f" title="Allocate a new netlink message.">nlmsg_alloc_simple</a>(type, flags);
<a name="l00417"></a>00417 <span class="keywordflow">if</span> (!msg)
<a name="l00418"></a>00418 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00419"></a>00419
<a name="l00420"></a>00420 <span class="keywordflow">if</span> (buf && size) {
<a name="l00421"></a>00421 err = <a class="code" href="group__msg.html#gacc5e5ade5675d041f86c7c8693f7088d" title="Append data to tail of a netlink message.">nlmsg_append</a>(msg, buf, size, NLMSG_ALIGNTO);
<a name="l00422"></a>00422 <span class="keywordflow">if</span> (err < 0)
<a name="l00423"></a>00423 <span class="keywordflow">goto</span> errout;
<a name="l00424"></a>00424 }
<a name="l00425"></a>00425
<a name="l00426"></a>00426
<a name="l00427"></a>00427 err = <a class="code" href="group__nl.html#ga01a2aad82350f867e704d5c696438b60" title="Send netlink message and check &amp; extend header values as needed.">nl_send_auto_complete</a>(handle, msg);
<a name="l00428"></a>00428 errout:
<a name="l00429"></a>00429 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00430"></a>00430
<a name="l00431"></a>00431 <span class="keywordflow">return</span> err;
<a name="l00432"></a>00432 }
<a name="l00433"></a>00433 <span class="comment"></span>
<a name="l00434"></a>00434 <span class="comment">/** @} */</span>
<a name="l00435"></a>00435 <span class="comment"></span>
<a name="l00436"></a>00436 <span class="comment">/**</span>
<a name="l00437"></a>00437 <span class="comment"> * @name Receive</span>
<a name="l00438"></a>00438 <span class="comment"> * @{</span>
<a name="l00439"></a>00439 <span class="comment"> */</span>
<a name="l00440"></a>00440 <span class="comment"></span>
<a name="l00441"></a>00441 <span class="comment">/**</span>
<a name="l00442"></a>00442 <span class="comment"> * Receive data from netlink socket</span>
<a name="l00443"></a>00443 <span class="comment"> * @arg handle Netlink handle.</span>
<a name="l00444"></a>00444 <span class="comment"> * @arg nla Destination pointer for peer's netlink address.</span>
<a name="l00445"></a>00445 <span class="comment"> * @arg buf Destination pointer for message content.</span>
<a name="l00446"></a>00446 <span class="comment"> * @arg creds Destination pointer for credentials.</span>
<a name="l00447"></a>00447 <span class="comment"> *</span>
<a name="l00448"></a>00448 <span class="comment"> * Receives a netlink message, allocates a buffer in \c *buf and</span>
<a name="l00449"></a>00449 <span class="comment"> * stores the message content. The peer's netlink address is stored</span>
<a name="l00450"></a>00450 <span class="comment"> * in \c *nla. The caller is responsible for freeing the buffer allocated</span>
<a name="l00451"></a>00451 <span class="comment"> * in \c *buf if a positive value is returned. Interruped system calls</span>
<a name="l00452"></a>00452 <span class="comment"> * are handled by repeating the read. The input buffer size is determined</span>
<a name="l00453"></a>00453 <span class="comment"> * by peeking before the actual read is done.</span>
<a name="l00454"></a>00454 <span class="comment"> *</span>
<a name="l00455"></a>00455 <span class="comment"> * A non-blocking sockets causes the function to return immediately with</span>
<a name="l00456"></a>00456 <span class="comment"> * a return value of 0 if no data is available.</span>
<a name="l00457"></a>00457 <span class="comment"> *</span>
<a name="l00458"></a>00458 <span class="comment"> * @return Number of octets read, 0 on EOF or a negative error code.</span>
<a name="l00459"></a>00459 <span class="comment"> */</span>
<a name="l00460"></a><a class="code" href="group__nl.html#ga060acc8371fdb242c5ae3d5b761d28e1">00460</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#ga060acc8371fdb242c5ae3d5b761d28e1" title="Receive data from netlink socket.">nl_recv</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> <a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> *nla,
<a name="l00461"></a>00461 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **buf, <span class="keyword">struct</span> ucred **creds)
<a name="l00462"></a>00462 {
<a name="l00463"></a>00463 <span class="keywordtype">int</span> n;
<a name="l00464"></a>00464 <span class="keywordtype">int</span> flags = 0;
<a name="l00465"></a>00465 <span class="keyword">static</span> <span class="keywordtype">int</span> page_size = 0;
<a name="l00466"></a>00466 <span class="keyword">struct </span>iovec iov;
<a name="l00467"></a>00467 <span class="keyword">struct </span>msghdr msg = {
<a name="l00468"></a>00468 .msg_name = (<span class="keywordtype">void</span> *) nla,
<a name="l00469"></a>00469 .msg_namelen = <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a>),
<a name="l00470"></a>00470 .msg_iov = &iov,
<a name="l00471"></a>00471 .msg_iovlen = 1,
<a name="l00472"></a>00472 .msg_control = NULL,
<a name="l00473"></a>00473 .msg_controllen = 0,
<a name="l00474"></a>00474 .msg_flags = 0,
<a name="l00475"></a>00475 };
<a name="l00476"></a>00476 <span class="keyword">struct </span>cmsghdr *cmsg;
<a name="l00477"></a>00477
<a name="l00478"></a>00478 <span class="keywordflow">if</span> (handle->h_flags & NL_MSG_PEEK)
<a name="l00479"></a>00479 flags |= MSG_PEEK;
<a name="l00480"></a>00480
<a name="l00481"></a>00481 <span class="keywordflow">if</span> (page_size == 0)
<a name="l00482"></a>00482 page_size = getpagesize();
<a name="l00483"></a>00483
<a name="l00484"></a>00484 iov.iov_len = page_size;
<a name="l00485"></a>00485 iov.iov_base = *buf = calloc(1, iov.iov_len);
<a name="l00486"></a>00486
<a name="l00487"></a>00487 <span class="keywordflow">if</span> (handle->h_flags & NL_SOCK_PASSCRED) {
<a name="l00488"></a>00488 msg.msg_controllen = CMSG_SPACE(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> ucred));
<a name="l00489"></a>00489 msg.msg_control = calloc(1, msg.msg_controllen);
<a name="l00490"></a>00490 }
<a name="l00491"></a>00491 retry:
<a name="l00492"></a>00492
<a name="l00493"></a>00493 n = recvmsg(handle->h_fd, &msg, flags);
<a name="l00494"></a>00494 <span class="keywordflow">if</span> (!n)
<a name="l00495"></a>00495 <span class="keywordflow">goto</span> abort;
<a name="l00496"></a>00496 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (n < 0) {
<a name="l00497"></a>00497 <span class="keywordflow">if</span> (errno == EINTR) {
<a name="l00498"></a>00498 NL_DBG(3, <span class="stringliteral">"recvmsg() returned EINTR, retrying\n"</span>);
<a name="l00499"></a>00499 <span class="keywordflow">goto</span> retry;
<a name="l00500"></a>00500 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (errno == EAGAIN) {
<a name="l00501"></a>00501 NL_DBG(3, <span class="stringliteral">"recvmsg() returned EAGAIN, aborting\n"</span>);
<a name="l00502"></a>00502 <span class="keywordflow">goto</span> abort;
<a name="l00503"></a>00503 } <span class="keywordflow">else</span> {
<a name="l00504"></a>00504 free(msg.msg_control);
<a name="l00505"></a>00505 free(*buf);
<a name="l00506"></a>00506 <span class="keywordflow">return</span> nl_error(errno, <span class="stringliteral">"recvmsg failed"</span>);
<a name="l00507"></a>00507 }
<a name="l00508"></a>00508 }
<a name="l00509"></a>00509
<a name="l00510"></a>00510 <span class="keywordflow">if</span> (iov.iov_len < n ||
<a name="l00511"></a>00511 msg.msg_flags & MSG_TRUNC) {
<a name="l00512"></a>00512 <span class="comment">/* Provided buffer is not long enough, enlarge it</span>
<a name="l00513"></a>00513 <span class="comment"> * and try again. */</span>
<a name="l00514"></a>00514 iov.iov_len *= 2;
<a name="l00515"></a>00515 iov.iov_base = *buf = realloc(*buf, iov.iov_len);
<a name="l00516"></a>00516 <span class="keywordflow">goto</span> retry;
<a name="l00517"></a>00517 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (msg.msg_flags & MSG_CTRUNC) {
<a name="l00518"></a>00518 msg.msg_controllen *= 2;
<a name="l00519"></a>00519 msg.msg_control = realloc(msg.msg_control, msg.msg_controllen);
<a name="l00520"></a>00520 <span class="keywordflow">goto</span> retry;
<a name="l00521"></a>00521 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (flags != 0) {
<a name="l00522"></a>00522 <span class="comment">/* Buffer is big enough, do the actual reading */</span>
<a name="l00523"></a>00523 flags = 0;
<a name="l00524"></a>00524 <span class="keywordflow">goto</span> retry;
<a name="l00525"></a>00525 }
<a name="l00526"></a>00526
<a name="l00527"></a>00527 <span class="keywordflow">if</span> (msg.msg_namelen != <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a>)) {
<a name="l00528"></a>00528 free(msg.msg_control);
<a name="l00529"></a>00529 free(*buf);
<a name="l00530"></a>00530 <span class="keywordflow">return</span> nl_error(EADDRNOTAVAIL, <span class="stringliteral">"socket address size mismatch"</span>);
<a name="l00531"></a>00531 }
<a name="l00532"></a>00532
<a name="l00533"></a>00533 <span class="keywordflow">for</span> (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
<a name="l00534"></a>00534 <span class="keywordflow">if</span> (cmsg->cmsg_level == SOL_SOCKET &&
<a name="l00535"></a>00535 cmsg->cmsg_type == SCM_CREDENTIALS) {
<a name="l00536"></a>00536 *creds = calloc(1, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ucred));
<a name="l00537"></a>00537 memcpy(*creds, CMSG_DATA(cmsg), <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ucred));
<a name="l00538"></a>00538 <span class="keywordflow">break</span>;
<a name="l00539"></a>00539 }
<a name="l00540"></a>00540 }
<a name="l00541"></a>00541
<a name="l00542"></a>00542 free(msg.msg_control);
<a name="l00543"></a>00543 <span class="keywordflow">return</span> n;
<a name="l00544"></a>00544
<a name="l00545"></a>00545 abort:
<a name="l00546"></a>00546 free(msg.msg_control);
<a name="l00547"></a>00547 free(*buf);
<a name="l00548"></a>00548 <span class="keywordflow">return</span> 0;
<a name="l00549"></a>00549 }
<a name="l00550"></a>00550
<a name="l00551"></a>00551 <span class="preprocessor">#define NL_CB_CALL(cb, type, msg) \</span>
<a name="l00552"></a>00552 <span class="preprocessor">do { \</span>
<a name="l00553"></a>00553 <span class="preprocessor"> err = nl_cb_call(cb, type, msg); \</span>
<a name="l00554"></a>00554 <span class="preprocessor"> switch (err) { \</span>
<a name="l00555"></a>00555 <span class="preprocessor"> case NL_OK: \</span>
<a name="l00556"></a>00556 <span class="preprocessor"> err = 0; \</span>
<a name="l00557"></a>00557 <span class="preprocessor"> break; \</span>
<a name="l00558"></a>00558 <span class="preprocessor"> case NL_SKIP: \</span>
<a name="l00559"></a>00559 <span class="preprocessor"> goto skip; \</span>
<a name="l00560"></a>00560 <span class="preprocessor"> case NL_STOP: \</span>
<a name="l00561"></a>00561 <span class="preprocessor"> goto stop; \</span>
<a name="l00562"></a>00562 <span class="preprocessor"> default: \</span>
<a name="l00563"></a>00563 <span class="preprocessor"> goto out; \</span>
<a name="l00564"></a>00564 <span class="preprocessor"> } \</span>
<a name="l00565"></a>00565 <span class="preprocessor">} while (0)</span>
<a name="l00566"></a>00566 <span class="preprocessor"></span>
<a name="l00567"></a>00567 <span class="keyword">static</span> <span class="keywordtype">int</span> recvmsgs(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> nl_cb *cb)
<a name="l00568"></a>00568 {
<a name="l00569"></a>00569 <span class="keywordtype">int</span> n, err = 0, multipart = 0;
<a name="l00570"></a>00570 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf = NULL;
<a name="l00571"></a>00571 <span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *hdr;
<a name="l00572"></a>00572 <span class="keyword">struct </span><a class="code" href="structsockaddr__nl.html" title="Netlink socket address.">sockaddr_nl</a> nla = {0};
<a name="l00573"></a>00573 <span class="keyword">struct </span>nl_msg *msg = NULL;
<a name="l00574"></a>00574 <span class="keyword">struct </span>ucred *creds = NULL;
<a name="l00575"></a>00575
<a name="l00576"></a>00576 continue_reading:
<a name="l00577"></a>00577 NL_DBG(3, <span class="stringliteral">"Attempting to read from %p\n"</span>, handle);
<a name="l00578"></a>00578 <span class="keywordflow">if</span> (cb->cb_recv_ow)
<a name="l00579"></a>00579 n = cb->cb_recv_ow(handle, &nla, &buf, &creds);
<a name="l00580"></a>00580 <span class="keywordflow">else</span>
<a name="l00581"></a>00581 n = <a class="code" href="group__nl.html#ga060acc8371fdb242c5ae3d5b761d28e1" title="Receive data from netlink socket.">nl_recv</a>(handle, &nla, &buf, &creds);
<a name="l00582"></a>00582
<a name="l00583"></a>00583 <span class="keywordflow">if</span> (n <= 0)
<a name="l00584"></a>00584 <span class="keywordflow">return</span> n;
<a name="l00585"></a>00585
<a name="l00586"></a>00586 NL_DBG(3, <span class="stringliteral">"recvmsgs(%p): Read %d bytes\n"</span>, handle, n);
<a name="l00587"></a>00587
<a name="l00588"></a>00588 hdr = (<span class="keyword">struct </span><a class="code" href="structnlmsghdr.html" title="Netlink message header.">nlmsghdr</a> *) buf;
<a name="l00589"></a>00589 <span class="keywordflow">while</span> (<a class="code" href="group__msg.html#ga0107484894e5be506c1e1bb6cb09dbe2" title="check if the netlink message fits into the remaining bytes">nlmsg_ok</a>(hdr, n)) {
<a name="l00590"></a>00590 NL_DBG(3, <span class="stringliteral">"recgmsgs(%p): Processing valid message...\n"</span>,
<a name="l00591"></a>00591 handle);
<a name="l00592"></a>00592
<a name="l00593"></a>00593 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00594"></a>00594 msg = <a class="code" href="group__msg.html#ga2695036495d7127e610bc99fee5c9674" title="Convert a netlink message received from a netlink socket to a nl_msg.">nlmsg_convert</a>(hdr);
<a name="l00595"></a>00595 <span class="keywordflow">if</span> (!msg) {
<a name="l00596"></a>00596 err = nl_errno(ENOMEM);
<a name="l00597"></a>00597 <span class="keywordflow">goto</span> out;
<a name="l00598"></a>00598 }
<a name="l00599"></a>00599
<a name="l00600"></a>00600 nlmsg_set_proto(msg, handle->h_proto);
<a name="l00601"></a>00601 nlmsg_set_src(msg, &nla);
<a name="l00602"></a>00602 <span class="keywordflow">if</span> (creds)
<a name="l00603"></a>00603 nlmsg_set_creds(msg, creds);
<a name="l00604"></a>00604
<a name="l00605"></a>00605 <span class="comment">/* Raw callback is the first, it gives the most control</span>
<a name="l00606"></a>00606 <span class="comment"> * to the user and he can do his very own parsing. */</span>
<a name="l00607"></a>00607 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a160d69995bab2c325bd25d7ee2d5292d" title="Called for every message received.">NL_CB_MSG_IN</a>])
<a name="l00608"></a>00608 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a160d69995bab2c325bd25d7ee2d5292d" title="Called for every message received.">NL_CB_MSG_IN</a>, msg);
<a name="l00609"></a>00609
<a name="l00610"></a>00610 <span class="comment">/* Sequence number checking. The check may be done by</span>
<a name="l00611"></a>00611 <span class="comment"> * the user, otherwise a very simple check is applied</span>
<a name="l00612"></a>00612 <span class="comment"> * enforcing strict ordering */</span>
<a name="l00613"></a>00613 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363ae73e906b997f00e8911b09e0f254364d" title="Called instead of internal sequence number checking.">NL_CB_SEQ_CHECK</a>])
<a name="l00614"></a>00614 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363ae73e906b997f00e8911b09e0f254364d" title="Called instead of internal sequence number checking.">NL_CB_SEQ_CHECK</a>, msg);
<a name="l00615"></a>00615 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#ad6c6a7aa9de65bb2da498c84148be7e6" title="Sequence number.">nlmsg_seq</a> != handle->h_seq_expect) {
<a name="l00616"></a>00616 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363af5b5448bf122561db88d510e5d153a8a" title="Message is malformed and invalid.">NL_CB_INVALID</a>])
<a name="l00617"></a>00617 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363af5b5448bf122561db88d510e5d153a8a" title="Message is malformed and invalid.">NL_CB_INVALID</a>, msg);
<a name="l00618"></a>00618 <span class="keywordflow">else</span> {
<a name="l00619"></a>00619 err = nl_error(EINVAL,
<a name="l00620"></a>00620 <span class="stringliteral">"Sequence number mismatch"</span>);
<a name="l00621"></a>00621 <span class="keywordflow">goto</span> out;
<a name="l00622"></a>00622 }
<a name="l00623"></a>00623 }
<a name="l00624"></a>00624
<a name="l00625"></a>00625 <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga151b98bf01f462dbc5d3c69e6396e064" title="Message terminates a multipart message.">NLMSG_DONE</a> ||
<a name="l00626"></a>00626 hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga2d6d3c937fdda1d64201c5abfd5a2b83" title="The message signals an error and the payload contains a nlmsgerr structure.">NLMSG_ERROR</a> ||
<a name="l00627"></a>00627 hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga3033de03e6242ba7d7ffd2f2f4d3fb38" title="No operation, message must be ignored.">NLMSG_NOOP</a> ||
<a name="l00628"></a>00628 hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga369a70cf77edb2766b2196dfc70e9147" title="The message signals that data got lost.">NLMSG_OVERRUN</a>) {
<a name="l00629"></a>00629 <span class="comment">/* We can't check for !NLM_F_MULTI since some netlink</span>
<a name="l00630"></a>00630 <span class="comment"> * users in the kernel are broken. */</span>
<a name="l00631"></a>00631 handle->h_seq_expect++;
<a name="l00632"></a>00632 NL_DBG(3, <span class="stringliteral">"recvmsgs(%p): Increased expected "</span> \
<a name="l00633"></a>00633 <span class="stringliteral">"sequence number to %d\n"</span>,
<a name="l00634"></a>00634 handle, handle->h_seq_expect);
<a name="l00635"></a>00635 }
<a name="l00636"></a>00636
<a name="l00637"></a>00637 <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#abcf664d354ea35ebb9b3d8a50088fec6" title="Message flags.">nlmsg_flags</a> & <a class="code" href="group__msg.html#ga245e7fde2fbbdeb3860899f50213ff35" title="Indicates the message is part of a multipart message terminated by NLMSG_DONE.">NLM_F_MULTI</a>)
<a name="l00638"></a>00638 multipart = 1;
<a name="l00639"></a>00639
<a name="l00640"></a>00640 <span class="comment">/* Other side wishes to see an ack for this message */</span>
<a name="l00641"></a>00641 <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#abcf664d354ea35ebb9b3d8a50088fec6" title="Message flags.">nlmsg_flags</a> & <a class="code" href="group__msg.html#ga67d5b6ba8714b97d74df72d119351bee" title="Request for an acknowledgment on success.">NLM_F_ACK</a>) {
<a name="l00642"></a>00642 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363af2930b7775d1444c359cd11d7ce2cd02" title="Sending of an acknowledge message has been requested.">NL_CB_SEND_ACK</a>])
<a name="l00643"></a>00643 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363af2930b7775d1444c359cd11d7ce2cd02" title="Sending of an acknowledge message has been requested.">NL_CB_SEND_ACK</a>, msg);
<a name="l00644"></a>00644 <span class="keywordflow">else</span> {
<a name="l00645"></a>00645 <span class="comment">/* FIXME: implement */</span>
<a name="l00646"></a>00646 }
<a name="l00647"></a>00647 }
<a name="l00648"></a>00648
<a name="l00649"></a>00649 <span class="comment">/* messages terminates a multpart message, this is</span>
<a name="l00650"></a>00650 <span class="comment"> * usually the end of a message and therefore we slip</span>
<a name="l00651"></a>00651 <span class="comment"> * out of the loop by default. the user may overrule</span>
<a name="l00652"></a>00652 <span class="comment"> * this action by skipping this packet. */</span>
<a name="l00653"></a>00653 <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga151b98bf01f462dbc5d3c69e6396e064" title="Message terminates a multipart message.">NLMSG_DONE</a>) {
<a name="l00654"></a>00654 multipart = 0;
<a name="l00655"></a>00655 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a044400d11ee451b692333a0d95cf3d32" title="Last message in a series of multi part messages received.">NL_CB_FINISH</a>])
<a name="l00656"></a>00656 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a044400d11ee451b692333a0d95cf3d32" title="Last message in a series of multi part messages received.">NL_CB_FINISH</a>, msg);
<a name="l00657"></a>00657 }
<a name="l00658"></a>00658
<a name="l00659"></a>00659 <span class="comment">/* Message to be ignored, the default action is to</span>
<a name="l00660"></a>00660 <span class="comment"> * skip this message if no callback is specified. The</span>
<a name="l00661"></a>00661 <span class="comment"> * user may overrule this action by returning</span>
<a name="l00662"></a>00662 <span class="comment"> * NL_PROCEED. */</span>
<a name="l00663"></a>00663 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga3033de03e6242ba7d7ffd2f2f4d3fb38" title="No operation, message must be ignored.">NLMSG_NOOP</a>) {
<a name="l00664"></a>00664 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a034ec83d5ba891deb3d3e54f9e15d3a0" title="Message wants to be skipped.">NL_CB_SKIPPED</a>])
<a name="l00665"></a>00665 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a034ec83d5ba891deb3d3e54f9e15d3a0" title="Message wants to be skipped.">NL_CB_SKIPPED</a>, msg);
<a name="l00666"></a>00666 <span class="keywordflow">else</span>
<a name="l00667"></a>00667 <span class="keywordflow">goto</span> skip;
<a name="l00668"></a>00668 }
<a name="l00669"></a>00669
<a name="l00670"></a>00670 <span class="comment">/* Data got lost, report back to user. The default action is to</span>
<a name="l00671"></a>00671 <span class="comment"> * quit parsing. The user may overrule this action by retuning</span>
<a name="l00672"></a>00672 <span class="comment"> * NL_SKIP or NL_PROCEED (dangerous) */</span>
<a name="l00673"></a>00673 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga369a70cf77edb2766b2196dfc70e9147" title="The message signals that data got lost.">NLMSG_OVERRUN</a>) {
<a name="l00674"></a>00674 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a25c8376dc758b16bcaeb76c329719dae" title="Report received that data was lost.">NL_CB_OVERRUN</a>])
<a name="l00675"></a>00675 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a25c8376dc758b16bcaeb76c329719dae" title="Report received that data was lost.">NL_CB_OVERRUN</a>, msg);
<a name="l00676"></a>00676 <span class="keywordflow">else</span> {
<a name="l00677"></a>00677 err = nl_error(EOVERFLOW, <span class="stringliteral">"Overrun"</span>);
<a name="l00678"></a>00678 <span class="keywordflow">goto</span> out;
<a name="l00679"></a>00679 }
<a name="l00680"></a>00680 }
<a name="l00681"></a>00681
<a name="l00682"></a>00682 <span class="comment">/* Message carries a nlmsgerr */</span>
<a name="l00683"></a>00683 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#a7232c4e6cb513010e64887b7eebf8823" title="Message type (content type)">nlmsg_type</a> == <a class="code" href="group__msg.html#ga2d6d3c937fdda1d64201c5abfd5a2b83" title="The message signals an error and the payload contains a nlmsgerr structure.">NLMSG_ERROR</a>) {
<a name="l00684"></a>00684 <span class="keyword">struct </span><a class="code" href="structnlmsgerr.html" title="Netlink error message.">nlmsgerr</a> *e = <a class="code" href="group__msg.html#gae44a904bb40c8b5f5ff31539c21cfa5a" title="head of message payload">nlmsg_data</a>(hdr);
<a name="l00685"></a>00685
<a name="l00686"></a>00686 <span class="keywordflow">if</span> (hdr-><a class="code" href="structnlmsghdr.html#a5a3fdb3436743ec73e75471c899fd4bc" title="Length of message including header.">nlmsg_len</a> < <a class="code" href="group__msg.html#ga3790ddfe9268d3b63f3cd1ceb9bb2f83" title="length of netlink message not including padding">nlmsg_msg_size</a>(<span class="keyword">sizeof</span>(*e))) {
<a name="l00687"></a>00687 <span class="comment">/* Truncated error message, the default action</span>
<a name="l00688"></a>00688 <span class="comment"> * is to stop parsing. The user may overrule</span>
<a name="l00689"></a>00689 <span class="comment"> * this action by returning NL_SKIP or</span>
<a name="l00690"></a>00690 <span class="comment"> * NL_PROCEED (dangerous) */</span>
<a name="l00691"></a>00691 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363af5b5448bf122561db88d510e5d153a8a" title="Message is malformed and invalid.">NL_CB_INVALID</a>])
<a name="l00692"></a>00692 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363af5b5448bf122561db88d510e5d153a8a" title="Message is malformed and invalid.">NL_CB_INVALID</a>, msg);
<a name="l00693"></a>00693 <span class="keywordflow">else</span> {
<a name="l00694"></a>00694 err = nl_error(EINVAL,
<a name="l00695"></a>00695 <span class="stringliteral">"Truncated error message"</span>);
<a name="l00696"></a>00696 <span class="keywordflow">goto</span> out;
<a name="l00697"></a>00697 }
<a name="l00698"></a>00698 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (e-><a class="code" href="structnlmsgerr.html#ad74e54e113a2aefba0d2a3e0bb8a768d" title="Error code (errno number)">error</a>) {
<a name="l00699"></a>00699 <span class="comment">/* Error message reported back from kernel. */</span>
<a name="l00700"></a>00700 <span class="keywordflow">if</span> (cb->cb_err) {
<a name="l00701"></a>00701 err = cb->cb_err(&nla, e,
<a name="l00702"></a>00702 cb->cb_err_arg);
<a name="l00703"></a>00703 <span class="keywordflow">if</span> (err < 0)
<a name="l00704"></a>00704 <span class="keywordflow">goto</span> out;
<a name="l00705"></a>00705 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (err == <a class="code" href="group__cb.html#gga0c50cb29c507b3d7e8bc7d76c74675f8af77d78aac004c6d4bee57741d3a295ae" title="Skip this message.">NL_SKIP</a>)
<a name="l00706"></a>00706 <span class="keywordflow">goto</span> skip;
<a name="l00707"></a>00707 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (err == <a class="code" href="group__cb.html#gga0c50cb29c507b3d7e8bc7d76c74675f8aa87c4bfa1b41e2e06286a412dc2bc17b" title="Stop parsing altogether and discard remaining messages.">NL_STOP</a>) {
<a name="l00708"></a>00708 err = nl_error(-e-><a class="code" href="structnlmsgerr.html#ad74e54e113a2aefba0d2a3e0bb8a768d" title="Error code (errno number)">error</a>,
<a name="l00709"></a>00709 <span class="stringliteral">"Netlink Error"</span>);
<a name="l00710"></a>00710 <span class="keywordflow">goto</span> out;
<a name="l00711"></a>00711 }
<a name="l00712"></a>00712 } <span class="keywordflow">else</span> {
<a name="l00713"></a>00713 err = nl_error(-e-><a class="code" href="structnlmsgerr.html#ad74e54e113a2aefba0d2a3e0bb8a768d" title="Error code (errno number)">error</a>,
<a name="l00714"></a>00714 <span class="stringliteral">"Netlink Error"</span>);
<a name="l00715"></a>00715 <span class="keywordflow">goto</span> out;
<a name="l00716"></a>00716 }
<a name="l00717"></a>00717 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a8295b387c07bd076ccdee45b555f1134" title="Message is an acknowledge.">NL_CB_ACK</a>])
<a name="l00718"></a>00718 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a8295b387c07bd076ccdee45b555f1134" title="Message is an acknowledge.">NL_CB_ACK</a>, msg);
<a name="l00719"></a>00719 } <span class="keywordflow">else</span> {
<a name="l00720"></a>00720 <span class="comment">/* Valid message (not checking for MULTIPART bit to</span>
<a name="l00721"></a>00721 <span class="comment"> * get along with broken kernels. NL_SKIP has no</span>
<a name="l00722"></a>00722 <span class="comment"> * effect on this. */</span>
<a name="l00723"></a>00723 <span class="keywordflow">if</span> (cb->cb_set[<a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a6e1f371d16186a460f25ea9bb1306c47" title="Message is valid.">NL_CB_VALID</a>])
<a name="l00724"></a>00724 NL_CB_CALL(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a6e1f371d16186a460f25ea9bb1306c47" title="Message is valid.">NL_CB_VALID</a>, msg);
<a name="l00725"></a>00725 }
<a name="l00726"></a>00726 skip:
<a name="l00727"></a>00727 err = 0;
<a name="l00728"></a>00728 hdr = <a class="code" href="group__msg.html#gafae8cbad57755ac6d758f6073cb22134" title="next netlink message in message stream">nlmsg_next</a>(hdr, &n);
<a name="l00729"></a>00729 }
<a name="l00730"></a>00730
<a name="l00731"></a>00731 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00732"></a>00732 free(buf);
<a name="l00733"></a>00733 free(creds);
<a name="l00734"></a>00734 buf = NULL;
<a name="l00735"></a>00735 msg = NULL;
<a name="l00736"></a>00736 creds = NULL;
<a name="l00737"></a>00737
<a name="l00738"></a>00738 <span class="keywordflow">if</span> (multipart) {
<a name="l00739"></a>00739 <span class="comment">/* Multipart message not yet complete, continue reading */</span>
<a name="l00740"></a>00740 <span class="keywordflow">goto</span> continue_reading;
<a name="l00741"></a>00741 }
<a name="l00742"></a>00742 stop:
<a name="l00743"></a>00743 err = 0;
<a name="l00744"></a>00744 out:
<a name="l00745"></a>00745 <a class="code" href="group__msg.html#ga138ba9bee70553f9fbe7143deacad48c" title="Free a netlink message.">nlmsg_free</a>(msg);
<a name="l00746"></a>00746 free(buf);
<a name="l00747"></a>00747 free(creds);
<a name="l00748"></a>00748
<a name="l00749"></a>00749 <span class="keywordflow">return</span> err;
<a name="l00750"></a>00750 }
<a name="l00751"></a>00751 <span class="comment"></span>
<a name="l00752"></a>00752 <span class="comment">/**</span>
<a name="l00753"></a>00753 <span class="comment"> * Receive a set of messages from a netlink socket.</span>
<a name="l00754"></a>00754 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00755"></a>00755 <span class="comment"> * @arg cb set of callbacks to control behaviour.</span>
<a name="l00756"></a>00756 <span class="comment"> *</span>
<a name="l00757"></a>00757 <span class="comment"> * Repeatedly calls nl_recv() or the respective replacement if provided</span>
<a name="l00758"></a>00758 <span class="comment"> * by the application (see nl_cb_overwrite_recv()) and parses the</span>
<a name="l00759"></a>00759 <span class="comment"> * received data as netlink messages. Stops reading if one of the</span>
<a name="l00760"></a>00760 <span class="comment"> * callbacks returns NL_STOP or nl_recv returns either 0 or a negative error code.</span>
<a name="l00761"></a>00761 <span class="comment"> *</span>
<a name="l00762"></a>00762 <span class="comment"> * A non-blocking sockets causes the function to return immediately if</span>
<a name="l00763"></a>00763 <span class="comment"> * no data is available.</span>
<a name="l00764"></a>00764 <span class="comment"> *</span>
<a name="l00765"></a>00765 <span class="comment"> * @return 0 on success or a negative error code from nl_recv().</span>
<a name="l00766"></a>00766 <span class="comment"> */</span>
<a name="l00767"></a><a class="code" href="group__nl.html#ga1bb066e1772b89f79fe1d76a4ef243a6">00767</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#ga1bb066e1772b89f79fe1d76a4ef243a6" title="Receive a set of messages from a netlink socket.">nl_recvmsgs</a>(<span class="keyword">struct</span> nl_handle *handle, <span class="keyword">struct</span> nl_cb *cb)
<a name="l00768"></a>00768 {
<a name="l00769"></a>00769 <span class="keywordflow">if</span> (cb->cb_recvmsgs_ow)
<a name="l00770"></a>00770 <span class="keywordflow">return</span> cb->cb_recvmsgs_ow(handle, cb);
<a name="l00771"></a>00771 <span class="keywordflow">else</span>
<a name="l00772"></a>00772 <span class="keywordflow">return</span> recvmsgs(handle, cb);
<a name="l00773"></a>00773 }
<a name="l00774"></a>00774 <span class="comment"></span>
<a name="l00775"></a>00775 <span class="comment">/**</span>
<a name="l00776"></a>00776 <span class="comment"> * Receive a set of message from a netlink socket using handlers in nl_handle.</span>
<a name="l00777"></a>00777 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00778"></a>00778 <span class="comment"> *</span>
<a name="l00779"></a>00779 <span class="comment"> * Calls nl_recvmsgs() with the handlers configured in the netlink handle.</span>
<a name="l00780"></a>00780 <span class="comment"> */</span>
<a name="l00781"></a><a class="code" href="group__nl.html#gab287fc77c46d80c4e22bc87494cbf853">00781</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#gab287fc77c46d80c4e22bc87494cbf853" title="Receive a set of message from a netlink socket using handlers in nl_handle.">nl_recvmsgs_default</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00782"></a>00782 {
<a name="l00783"></a>00783 <span class="keywordflow">return</span> <a class="code" href="group__nl.html#ga1bb066e1772b89f79fe1d76a4ef243a6" title="Receive a set of messages from a netlink socket.">nl_recvmsgs</a>(handle, handle->h_cb);
<a name="l00784"></a>00784
<a name="l00785"></a>00785 }
<a name="l00786"></a>00786
<a name="l00787"></a>00787 <span class="keyword">static</span> <span class="keywordtype">int</span> ack_wait_handler(<span class="keyword">struct</span> nl_msg *msg, <span class="keywordtype">void</span> *arg)
<a name="l00788"></a>00788 {
<a name="l00789"></a>00789 <span class="keywordflow">return</span> <a class="code" href="group__cb.html#gga0c50cb29c507b3d7e8bc7d76c74675f8aa87c4bfa1b41e2e06286a412dc2bc17b" title="Stop parsing altogether and discard remaining messages.">NL_STOP</a>;
<a name="l00790"></a>00790 }
<a name="l00791"></a>00791 <span class="comment"></span>
<a name="l00792"></a>00792 <span class="comment">/**</span>
<a name="l00793"></a>00793 <span class="comment"> * Wait for ACK.</span>
<a name="l00794"></a>00794 <span class="comment"> * @arg handle netlink handle</span>
<a name="l00795"></a>00795 <span class="comment"> * @pre The netlink socket must be in blocking state.</span>
<a name="l00796"></a>00796 <span class="comment"> *</span>
<a name="l00797"></a>00797 <span class="comment"> * Waits until an ACK is received for the latest not yet acknowledged</span>
<a name="l00798"></a>00798 <span class="comment"> * netlink message.</span>
<a name="l00799"></a>00799 <span class="comment"> */</span>
<a name="l00800"></a><a class="code" href="group__nl.html#gaa65fec588e0a0a2de1881fb8366ccd79">00800</a> <span class="keywordtype">int</span> <a class="code" href="group__nl.html#gaa65fec588e0a0a2de1881fb8366ccd79" title="Wait for ACK.">nl_wait_for_ack</a>(<span class="keyword">struct</span> nl_handle *handle)
<a name="l00801"></a>00801 {
<a name="l00802"></a>00802 <span class="keywordtype">int</span> err;
<a name="l00803"></a>00803 <span class="keyword">struct </span>nl_cb *cb;
<a name="l00804"></a>00804
<a name="l00805"></a>00805 cb = <a class="code" href="group__cb.html#gad438f32bb0f83bd1d15f53e9525f1f65" title="Clone an existing callback handle.">nl_cb_clone</a>(handle->h_cb);
<a name="l00806"></a>00806 <span class="keywordflow">if</span> (cb == NULL)
<a name="l00807"></a>00807 <span class="keywordflow">return</span> nl_get_errno();
<a name="l00808"></a>00808
<a name="l00809"></a>00809 <a class="code" href="group__cb.html#gabe7b2516f28fbb8bb9c5b1ea2dfaf1d3" title="Set up a callback.">nl_cb_set</a>(cb, <a class="code" href="group__cb.html#gga3f60f4515ada826d2bf16395ee722363a8295b387c07bd076ccdee45b555f1134" title="Message is an acknowledge.">NL_CB_ACK</a>, <a class="code" href="group__cb.html#ggaba3fabad0c62db483941101e1a18d14da22448271a402b4c4a55733ef4884c038" title="Customized handler specified by the user.">NL_CB_CUSTOM</a>, ack_wait_handler, NULL);
<a name="l00810"></a>00810 err = <a class="code" href="group__nl.html#ga1bb066e1772b89f79fe1d76a4ef243a6" title="Receive a set of messages from a netlink socket.">nl_recvmsgs</a>(handle, cb);
<a name="l00811"></a>00811 nl_cb_put(cb);
<a name="l00812"></a>00812
<a name="l00813"></a>00813 <span class="keywordflow">return</span> err;
<a name="l00814"></a>00814 }
<a name="l00815"></a>00815 <span class="comment"></span>
<a name="l00816"></a>00816 <span class="comment">/** @} */</span>
<a name="l00817"></a>00817 <span class="comment"></span>
<a name="l00818"></a>00818 <span class="comment">/** @} */</span>
</pre></div></div>
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