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Add some basic setgroups(), getgroups() and initgroups().

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Also teach /bin/id to print the user's supplemental groups.
This commit is contained in:
Andreas Kling 2018-11-07 01:38:51 +01:00
parent d3bd3791cb
commit a7f1d892a9
12 changed files with 167 additions and 19 deletions
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22
LibC/grp.cpp
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@ -118,4 +118,26 @@ next_entry:
return __grdb_entry;
}
int initgroups(const char* user, gid_t extra_gid)
{
size_t count = 0;
gid_t gids[32];
bool extra_gid_added = false;
setgrent();
while (auto* gr = getgrent()) {
for (auto* mem = gr->gr_mem; *mem; ++mem) {
if (!strcmp(*mem, user)) {
gids[count++] = gr->gr_gid;
if (gr->gr_gid == extra_gid)
extra_gid_added = true;
break;
}
}
}
endgrent();
if (!extra_gid_added)
gids[count++] = extra_gid;
return setgroups(count, gids);
}
}