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<div class="title">lirc-utils.c</div> </div>
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<a href="lirc-utils_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/****************************************************************************</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * lirc-utils.c *************************************************************</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> ****************************************************************************</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> */</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <grp.h></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <pwd.h></span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <stdlib.h></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <string.h></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <sys/types.h></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <unistd.h></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#ifdef HAVE_CONFIG_H</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor"># include <config.h></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "lirc/lirc_log.h"</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "<a class="code" href="lirc-utils_8h.html">lirc-utils.h</a>"</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="lirc__log_8h.html#abffd9aa4ab9bcfacdbb9d7728037114b">logchannel_t</a> logchannel = LOG_LIB;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="group__private__api.html#ga08cad0a0a22fb34e70ef33be007e484d"> 28</a></span> <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="group__private__api.html#ga08cad0a0a22fb34e70ef33be007e484d">drop_sudo_root</a>(<span class="keywordtype">int</span> (*set_some_uid)(uid_t))</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keyword">struct </span>passwd* pw;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordtype">char</span>* user;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  GETGROUPS_T groups[32];</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordtype">int</span> group_cnt = <span class="keyword">sizeof</span>(groups)/<span class="keyword">sizeof</span>(gid_t);</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">char</span> groupnames[256] = {0};</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">char</span> buff[12];</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">int</span> r;</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordtype">int</span> i;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (getuid() != 0)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">return</span> <span class="stringliteral">""</span>;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  user = getenv(<span class="stringliteral">"SUDO_USER"</span>);</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">if</span> (user == NULL)</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">return</span> <span class="stringliteral">"root"</span>;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  pw = getpwnam(user);</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (pw == NULL) {</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <a class="code" href="lirc__log_8h.html#a40b15bc69c970ddbc6984cabf213f9a0">log_perror_err</a>(<span class="stringliteral">"Can't run getpwnam() for %s"</span>, user);</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">return</span> <span class="stringliteral">""</span>;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  r = getgrouplist(user, pw->pw_gid, groups, &group_cnt);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (r == -1) {</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <a class="code" href="lirc__log_8h.html#a9a1bc3b439c0d122c4e82be836c6f531">log_perror_warn</a>(<span class="stringliteral">"Cannot get supplementary groups"</span>);</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span> <span class="stringliteral">""</span>;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  r = setgroups(group_cnt, groups);</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">if</span> (r == -1) {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <a class="code" href="lirc__log_8h.html#a9a1bc3b439c0d122c4e82be836c6f531">log_perror_warn</a>(<span class="stringliteral">"Cannot set supplementary groups"</span>);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> <span class="stringliteral">""</span>;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  r = setgid(pw->pw_gid);</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (r == -1) {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <a class="code" href="lirc__log_8h.html#a9a1bc3b439c0d122c4e82be836c6f531">log_perror_warn</a>(<span class="stringliteral">"Cannot set GID"</span>);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">return</span> <span class="stringliteral">""</span>;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  r = set_some_uid(pw->pw_uid);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (r == -1) {</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <a class="code" href="lirc__log_8h.html#a9a1bc3b439c0d122c4e82be836c6f531">log_perror_warn</a>(<span class="stringliteral">"Cannot change UID to %d"</span>, pw->pw_uid);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span> <span class="stringliteral">""</span>;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  setenv(<span class="stringliteral">"HOME"</span>, pw->pw_dir, 1);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <a class="code" href="lirc__log_8h.html#a0ac90562e7d9fe7ee6b1b47801042a52">log_notice</a>(<span class="stringliteral">"Running as user %s"</span>, user);</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">for</span> (i = 0; i < group_cnt; i += 1) {</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  snprintf(buff, 5, <span class="stringliteral">" %d"</span>, groups[i]);</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  strcat(groupnames, buff);</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  }</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="code" href="lirc__log_8h.html#a0e37223ab9f5df7af8cb2a59b7c4dc18">log_debug</a>(<span class="stringliteral">"Groups: [%d]:%s"</span>, pw->pw_gid, groupnames);</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">return</span> pw->pw_name;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> }</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="group__private__api.html#ga24f983a41e2fccf1c7ba3ee4d69559a4"> 81</a></span> <span class="keywordtype">void</span> <a class="code" href="group__private__api.html#ga24f983a41e2fccf1c7ba3ee4d69559a4">drop_root_cli</a>(<span class="keywordtype">int</span> (*set_some_uid)(uid_t))</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">const</span> <span class="keywordtype">char</span>* new_user;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  new_user = <a class="code" href="group__private__api.html#ga08cad0a0a22fb34e70ef33be007e484d">drop_sudo_root</a>(set_some_uid);</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span> (strcmp(<span class="stringliteral">"root"</span>, new_user) == 0)</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  puts(<span class="stringliteral">"Warning: Running as root."</span>);</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strlen(new_user) == 0)</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  puts(<span class="stringliteral">"Warning: Cannot change uid."</span>);</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  printf(<span class="stringliteral">"Running as regular user %s\n"</span>, new_user);</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> }</div><div class="ttc" id="lirc__log_8h_html_a0e37223ab9f5df7af8cb2a59b7c4dc18"><div class="ttname"><a href="lirc__log_8h.html#a0e37223ab9f5df7af8cb2a59b7c4dc18">log_debug</a></div><div class="ttdeci">#define log_debug(fmt,...)</div><div class="ttdoc">Log a debug message.</div><div class="ttdef"><b>Definition:</b> <a href="lirc__log_8h_source.html#l00124">lirc_log.h:124</a></div></div>
<div class="ttc" id="lirc__log_8h_html_abffd9aa4ab9bcfacdbb9d7728037114b"><div class="ttname"><a href="lirc__log_8h.html#abffd9aa4ab9bcfacdbb9d7728037114b">logchannel_t</a></div><div class="ttdeci">logchannel_t</div><div class="ttdoc">Log channels used to filter messages.</div><div class="ttdef"><b>Definition:</b> <a href="lirc__log_8h_source.html#l00053">lirc_log.h:53</a></div></div>
<div class="ttc" id="lirc__log_8h_html_a40b15bc69c970ddbc6984cabf213f9a0"><div class="ttname"><a href="lirc__log_8h.html#a40b15bc69c970ddbc6984cabf213f9a0">log_perror_err</a></div><div class="ttdeci">#define log_perror_err(fmt,...)</div><div class="ttdoc">perror wrapper logging with level LIRC_ERROR.</div><div class="ttdef"><b>Definition:</b> <a href="lirc__log_8h_source.html#l00089">lirc_log.h:89</a></div></div>
<div class="ttc" id="lirc-utils_8h_html"><div class="ttname"><a href="lirc-utils_8h.html">lirc-utils.h</a></div><div class="ttdoc">Utilities.</div></div>
<div class="ttc" id="group__private__api_html_ga24f983a41e2fccf1c7ba3ee4d69559a4"><div class="ttname"><a href="group__private__api.html#ga24f983a41e2fccf1c7ba3ee4d69559a4">drop_root_cli</a></div><div class="ttdeci">void drop_root_cli(int(*set_some_uid)(uid_t))</div><div class="ttdoc">Default view part of drop_sudo_root.</div><div class="ttdef"><b>Definition:</b> <a href="lirc-utils_8c_source.html#l00081">lirc-utils.c:81</a></div></div>
<div class="ttc" id="group__private__api_html_ga08cad0a0a22fb34e70ef33be007e484d"><div class="ttname"><a href="group__private__api.html#ga08cad0a0a22fb34e70ef33be007e484d">drop_sudo_root</a></div><div class="ttdeci">const char * drop_sudo_root(int(*set_some_uid)(uid_t))</div><div class="ttdoc">Try to drop possible root privileges, returning new user or "" on error.</div><div class="ttdef"><b>Definition:</b> <a href="lirc-utils_8c_source.html#l00028">lirc-utils.c:28</a></div></div>
<div class="ttc" id="lirc__log_8h_html_a9a1bc3b439c0d122c4e82be836c6f531"><div class="ttname"><a href="lirc__log_8h.html#a9a1bc3b439c0d122c4e82be836c6f531">log_perror_warn</a></div><div class="ttdeci">#define log_perror_warn(fmt,...)</div><div class="ttdoc">perror wrapper logging with level LIRC_WARNING.</div><div class="ttdef"><b>Definition:</b> <a href="lirc__log_8h_source.html#l00094">lirc_log.h:94</a></div></div>
<div class="ttc" id="lirc__log_8h_html_a0ac90562e7d9fe7ee6b1b47801042a52"><div class="ttname"><a href="lirc__log_8h.html#a0ac90562e7d9fe7ee6b1b47801042a52">log_notice</a></div><div class="ttdeci">#define log_notice(fmt,...)</div><div class="ttdoc">Log a notice message.</div><div class="ttdef"><b>Definition:</b> <a href="lirc__log_8h_source.html#l00119">lirc_log.h:119</a></div></div>
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