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<hr><h1>rpmio/ugid.c</h1><a href="ugid_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00005 <span class="preprocessor">#include "<a class="code" href="system_8h.html">system.h</a>"</span>
00006 <span class="preprocessor">#include "<a class="code" href="ugid_8h.html">ugid.h</a>"</span>
00007 <span class="preprocessor">#include "<a class="code" href="debug_8h.html">debug.h</a>"</span>
00008
00009 <span class="comment">/* unameToUid(), uidTouname() and the group variants are really poorly</span>
00010 <span class="comment"> implemented. They really ought to use hash tables. I just made the</span>
00011 <span class="comment"> guess that most files would be owned by root or the same person/group</span>
00012 <span class="comment"> who owned the last file. Those two values are cached, everything else</span>
00013 <span class="comment"> is looked up via getpw() and getgr() functions. If this performs</span>
00014 <span class="comment"> too poorly I'll have to implement it properly :-( */</span>
00015
<a name="l00016"></a><a class="code" href="ugid_8c.html#a0">00016</a> <span class="keywordtype">int</span> <a class="code" href="ugid_8c.html#a0">unameToUid</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> * thisUname, uid_t * uid)
00017 {
00018 <span class="comment">/*@only@*/</span> <span class="keyword">static</span> <span class="keywordtype">char</span> * lastUname = NULL;
00019 <span class="keyword">static</span> size_t lastUnameLen = 0;
00020 <span class="keyword">static</span> size_t lastUnameAlloced;
00021 <span class="keyword">static</span> uid_t lastUid;
00022 <span class="keyword">struct </span>passwd * pwent;
00023 size_t thisUnameLen;
00024
00025 <span class="keywordflow">if</span> (!thisUname) {
00026 lastUnameLen = 0;
00027 <span class="keywordflow">return</span> -1;
00028 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(thisUname, <span class="stringliteral">"root"</span>) == 0) {
00029 *uid = 0;
00030 <span class="keywordflow">return</span> 0;
00031 }
00032
00033 thisUnameLen = strlen(thisUname);
00034 <span class="keywordflow">if</span> (lastUname == NULL || thisUnameLen != lastUnameLen ||
00035 strcmp(thisUname, lastUname) != 0) {
00036 <span class="keywordflow">if</span> (lastUnameAlloced < thisUnameLen + 1) {
00037 lastUnameAlloced = thisUnameLen + 10;
00038 lastUname = <a class="code" href="rpmmalloc_8c.html#a3">xrealloc</a>(lastUname, lastUnameAlloced); <span class="comment">/* XXX memory leak */</span>
00039 }
00040 strcpy(lastUname, thisUname);
00041
00042 pwent = getpwnam(thisUname);
00043 <span class="keywordflow">if</span> (pwent == NULL) {
00044 <span class="comment">/*@-internalglobs@*/</span> <span class="comment">/* FIX: shrug */</span>
00045 endpwent();
00046 <span class="comment">/*@=internalglobs@*/</span>
00047 pwent = getpwnam(thisUname);
00048 <span class="keywordflow">if</span> (pwent == NULL) <span class="keywordflow">return</span> -1;
00049 }
00050
00051 lastUid = pwent->pw_uid;
00052 }
00053
00054 *uid = lastUid;
00055
00056 <span class="keywordflow">return</span> 0;
00057 }
00058
<a name="l00059"></a><a class="code" href="ugid_8c.html#a1">00059</a> <span class="keywordtype">int</span> <a class="code" href="ugid_8c.html#a1">gnameToGid</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> * thisGname, gid_t * gid)
00060 {
00061 <span class="comment">/*@only@*/</span> <span class="keyword">static</span> <span class="keywordtype">char</span> * lastGname = NULL;
00062 <span class="keyword">static</span> size_t lastGnameLen = 0;
00063 <span class="keyword">static</span> size_t lastGnameAlloced;
00064 <span class="keyword">static</span> gid_t lastGid;
00065 size_t thisGnameLen;
00066 <span class="keyword">struct </span>group * grent;
00067
00068 <span class="keywordflow">if</span> (thisGname == NULL) {
00069 lastGnameLen = 0;
00070 <span class="keywordflow">return</span> -1;
00071 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(thisGname, <span class="stringliteral">"root"</span>) == 0) {
00072 *gid = 0;
00073 <span class="keywordflow">return</span> 0;
00074 }
00075
00076 thisGnameLen = strlen(thisGname);
00077 <span class="keywordflow">if</span> (lastGname == NULL || thisGnameLen != lastGnameLen ||
00078 strcmp(thisGname, lastGname) != 0)
00079 {
00080 <span class="keywordflow">if</span> (lastGnameAlloced < thisGnameLen + 1) {
00081 lastGnameAlloced = thisGnameLen + 10;
00082 lastGname = <a class="code" href="rpmmalloc_8c.html#a3">xrealloc</a>(lastGname, lastGnameAlloced); <span class="comment">/* XXX memory leak */</span>
00083 }
00084 strcpy(lastGname, thisGname);
00085
00086 grent = getgrnam(thisGname);
00087 <span class="keywordflow">if</span> (grent == NULL) {
00088 <span class="comment">/*@-internalglobs@*/</span> <span class="comment">/* FIX: shrug */</span>
00089 endgrent();
00090 <span class="comment">/*@=internalglobs@*/</span>
00091 grent = getgrnam(thisGname);
00092 <span class="keywordflow">if</span> (grent == NULL) <span class="keywordflow">return</span> -1;
00093 }
00094 lastGid = grent->gr_gid;
00095 }
00096
00097 *gid = lastGid;
00098
00099 <span class="keywordflow">return</span> 0;
00100 }
00101
<a name="l00102"></a><a class="code" href="ugid_8c.html#a2">00102</a> <span class="keywordtype">char</span> * <a class="code" href="ugid_8c.html#a2">uidToUname</a>(uid_t uid)
00103 {
00104 <span class="keyword">static</span> uid_t lastUid = (uid_t) -1;
00105 <span class="comment">/*@only@*/</span> <span class="keyword">static</span> <span class="keywordtype">char</span> * lastUname = NULL;
00106 <span class="keyword">static</span> size_t lastUnameLen = 0;
00107
00108 <span class="keywordflow">if</span> (uid == (uid_t) -1) {
00109 lastUid = (uid_t) -1;
00110 <span class="keywordflow">return</span> NULL;
00111 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (uid == (uid_t) 0) {
00112 <span class="keywordflow">return</span> <span class="stringliteral">"root"</span>;
00113 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (uid == lastUid) {
00114 <span class="keywordflow">return</span> lastUname;
00115 } <span class="keywordflow">else</span> {
00116 <span class="keyword">struct </span>passwd * pwent = getpwuid(uid);
00117 size_t len;
00118
00119 <span class="keywordflow">if</span> (pwent == NULL) <span class="keywordflow">return</span> NULL;
00120
00121 lastUid = uid;
00122 len = strlen(pwent->pw_name);
00123 <span class="keywordflow">if</span> (lastUnameLen < len + 1) {
00124 lastUnameLen = len + 20;
00125 lastUname = <a class="code" href="rpmmalloc_8c.html#a3">xrealloc</a>(lastUname, lastUnameLen);
00126 }
00127 strcpy(lastUname, pwent->pw_name);
00128
00129 <span class="keywordflow">return</span> lastUname;
00130 }
00131 }
00132
<a name="l00133"></a><a class="code" href="ugid_8c.html#a3">00133</a> <span class="keywordtype">char</span> * <a class="code" href="ugid_8c.html#a3">gidToGname</a>(gid_t gid)
00134 {
00135 <span class="keyword">static</span> gid_t lastGid = (gid_t) -1;
00136 <span class="comment">/*@only@*/</span> <span class="keyword">static</span> <span class="keywordtype">char</span> * lastGname = NULL;
00137 <span class="keyword">static</span> size_t lastGnameLen = 0;
00138
00139 <span class="keywordflow">if</span> (gid == (gid_t) -1) {
00140 lastGid = (gid_t) -1;
00141 <span class="keywordflow">return</span> NULL;
00142 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (gid == (gid_t) 0) {
00143 <span class="keywordflow">return</span> <span class="stringliteral">"root"</span>;
00144 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (gid == lastGid) {
00145 <span class="keywordflow">return</span> lastGname;
00146 } <span class="keywordflow">else</span> {
00147 <span class="keyword">struct </span>group * grent = getgrgid(gid);
00148 size_t len;
00149
00150 <span class="keywordflow">if</span> (grent == NULL) <span class="keywordflow">return</span> NULL;
00151
00152 lastGid = gid;
00153 len = strlen(grent->gr_name);
00154 <span class="keywordflow">if</span> (lastGnameLen < len + 1) {
00155 lastGnameLen = len + 20;
00156 lastGname = <a class="code" href="rpmmalloc_8c.html#a3">xrealloc</a>(lastGname, lastGnameLen);
00157 }
00158 strcpy(lastGname, grent->gr_name);
00159
00160 <span class="keywordflow">return</span> lastGname;
00161 }
00162 }
</pre></div><hr><address style="align: right;"><small>Generated on Thu Sep 12 22:15:02 2002 for rpm by
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