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wip initgroups_dyn

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This commit is contained in:
Motiejus Jakštys 2022-07-08 06:29:42 +03:00
parent df14c1fc67
commit 434f9e1571
2 changed files with 106 additions and 40 deletions
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21
src/DB.zig
View File

@ -280,7 +280,7 @@ pub fn fromBytes(buf: []align(8) const u8) InvalidHeader!DB {
}
// dumps PackedGroup to []u8 and returns a CGroup.
pub fn getGroup(self: *const DB, group: PackedGroup, buf: []u8) error{BufferTooSmall}!CGroup {
pub fn packCGroup(self: *const DB, group: PackedGroup, buf: []u8) error{BufferTooSmall}!CGroup {
const members_slice = self.groupmembers[group.members_offset..];
var vit = compress.VarintSliceIteratorMust(members_slice);
const num_members = vit.remaining;
@ -328,7 +328,7 @@ pub fn getgrnam(self: *const DB, name: []const u8, buf: []u8) error{BufferTooSma
const nbits = PackedGroup.alignment_bits;
const group = PackedGroup.fromBytes(self.groups[offset << nbits ..]).group;
if (!mem.eql(u8, name, group.name())) return null;
return try self.getGroup(group, buf);
return try self.packCGroup(group, buf);
}
// get a CGroup entry by it's gid.
@ -339,7 +339,7 @@ pub fn getgrgid(self: *const DB, gid: u32, buf: []u8) error{BufferTooSmall}!?CGr
const nbits = PackedGroup.alignment_bits;
const group = PackedGroup.fromBytes(self.groups[offset << nbits ..]).group;
if (gid != group.gid()) return null;
return try self.getGroup(group, buf);
return try self.packCGroup(group, buf);
}
fn pushStr(str: []const u8, buf: []u8, offset: *usize) [*:0]const u8 {
@ -350,7 +350,7 @@ fn pushStr(str: []const u8, buf: []u8, offset: *usize) [*:0]const u8 {
return buf[start .. start + str.len :0].ptr;
}
fn getUser(self: *const DB, user: PackedUser, buf: []u8) error{BufferTooSmall}!CUser {
pub fn writeUser(self: *const DB, user: PackedUser, buf: []u8) error{BufferTooSmall}!CUser {
const shell_reader = ShellReader{
.index = self.shell_index,
.blob = self.shell_blob,
@ -383,8 +383,7 @@ fn getUser(self: *const DB, user: PackedUser, buf: []u8) error{BufferTooSmall}!C
};
}
// get a CUser entry by name.
pub fn getpwnam(self: *const DB, name: []const u8, buf: []u8) error{BufferTooSmall}!?CUser {
pub fn getUser(self: *const DB, name: []const u8) ?PackedUser {
const idx = bdz.search(self.bdz_username, name);
// bdz may return a hash that's bigger than the number of users
if (idx >= self.header.num_users) return null;
@ -392,7 +391,13 @@ pub fn getpwnam(self: *const DB, name: []const u8, buf: []u8) error{BufferTooSma
const nbits = PackedUser.alignment_bits;
const user = PackedUser.fromBytes(self.users[offset << nbits ..]).user;
if (!mem.eql(u8, name, user.name())) return null;
return try self.getUser(user, buf);
return user;
}
// get a CUser entry by name.
pub fn getpwnam(self: *const DB, name: []const u8, buf: []u8) error{BufferTooSmall}!?CUser {
const user = self.getUser(name) orelse return null;
return try self.writeUser(user, buf);
}
// get a CUser entry by uid.
@ -403,7 +408,7 @@ pub fn getpwuid(self: *const DB, uid: u32, buf: []u8) error{BufferTooSmall}!?CUs
const nbits = PackedUser.alignment_bits;
const user = PackedUser.fromBytes(self.users[offset << nbits ..]).user;
if (uid != user.uid()) return null;
return try self.getUser(user, buf);
return try self.writeUser(user, buf);
}
fn shellSections(

119
src/libnss.zig
View File

@ -117,13 +117,13 @@ export fn _nss_turbo_getpwuid_r(
},
};
if (cuser) |got| {
passwd.* = got;
return c.NSS_STATUS_SUCCESS;
} else {
const got_cuser = cuser orelse {
errnop.* = @enumToInt(os.E.NOENT);
return c.NSS_STATUS_NOTFOUND;
}
};
passwd.* = got_cuser;
return c.NSS_STATUS_SUCCESS;
}
export fn _nss_turbo_getpwnam_r(
@ -144,13 +144,13 @@ export fn _nss_turbo_getpwnam_r(
},
};
if (cuser) |got| {
passwd.* = got;
return c.NSS_STATUS_SUCCESS;
} else {
const got_cuser = cuser orelse {
errnop.* = @enumToInt(os.E.NOENT);
return c.NSS_STATUS_NOTFOUND;
}
};
passwd.* = got_cuser;
return c.NSS_STATUS_SUCCESS;
}
export fn _nss_turbo_getgrgid_r(
@ -168,13 +168,13 @@ export fn _nss_turbo_getgrgid_r(
},
};
if (cgroup) |got| {
gr.* = got;
return c.NSS_STATUS_SUCCESS;
} else {
const got_cgroup = cgroup orelse {
errnop.* = @enumToInt(os.E.NOENT);
return c.NSS_STATUS_NOTFOUND;
}
};
gr.* = got_cgroup;
return c.NSS_STATUS_SUCCESS;
}
export fn _nss_turbo_getgrnam_r(
@ -194,13 +194,13 @@ export fn _nss_turbo_getgrnam_r(
},
};
if (cgroup) |got| {
group.* = got;
return c.NSS_STATUS_SUCCESS;
} else {
const got_cgroup = cgroup orelse {
errnop.* = @enumToInt(os.E.NOENT);
return c.NSS_STATUS_NOTFOUND;
}
};
group.* = got_cgroup;
return c.NSS_STATUS_SUCCESS;
}
export fn _nss_turbo_setpwent(_: c_int) void {
@ -221,11 +221,11 @@ export fn _nss_turbo_setpwent(_: c_int) void {
export fn _nss_turbo_endpwent() void {
global_init.call();
if (global_state) |*state| {
var state = global_state orelse return;
state.getpwent_iterator_mu.lock();
defer state.getpwent_iterator_mu.unlock();
state.getpwent_iterator = null;
}
state.getpwent_iterator_mu.unlock();
}
export fn _nss_turbo_setgrent(_: c_int) void {
@ -239,9 +239,10 @@ export fn _nss_turbo_setgrent(_: c_int) void {
export fn _nss_turbo_endgrent() void {
var state = getState() orelse return;
state.getgrent_iterator_mu.lock();
defer state.getgrent_iterator_mu.unlock();
state.getgrent_iterator = null;
state.getgrent_iterator_mu.unlock();
}
export fn _nss_turbo_getgrent_r(
@ -261,20 +262,80 @@ export fn _nss_turbo_getgrent_r(
return c.NSS_STATUS_UNAVAIL;
};
var group = it.next() orelse {
const group = it.next() orelse {
errnop.* = @enumToInt(os.E.NOENT);
return c.NSS_STATUS_NOTFOUND;
};
if (state.file.db.getGroup(group, buffer[0..buflen])) |cgroup| {
result.* = cgroup;
return c.NSS_STATUS_SUCCESS;
} else |err| switch (err) {
const buf = buffer[0..buflen];
const cgroup = state.file.db.packCGroup(group, buf) catch |err| switch (err) {
error.BufferTooSmall => {
errnop.* = @enumToInt(os.E.RANGE);
return c.NSS_STATUS_TRYAGAIN;
},
};
result.* = cgroup;
return c.NSS_STATUS_SUCCESS;
}
export fn _nss_turbo_getpwent_r(
result: *CUser,
buffer: [*]u8,
buflen: usize,
errnop: *c_int,
) c.enum_nss_status {
var state = getStateErrno(errnop) orelse return c.NSS_STATUS_UNAVAIL;
state.getpwent_iterator_mu.lock();
defer state.getpwent_iterator_mu.unlock();
var it = state.getpwent_iterator orelse {
// logic from _nss_systemd_getgrent_r
errnop.* = @enumToInt(os.E.HOSTDOWN);
return c.NSS_STATUS_UNAVAIL;
};
const user = it.next() orelse {
errnop.* = @enumToInt(os.E.NOENT);
return c.NSS_STATUS_NOTFOUND;
};
const buf = buffer[0..buflen];
const cuser = state.file.db.writeUser(user, buf) catch |err| switch (err) {
error.BufferTooSmall => {
errnop.* = @enumToInt(os.E.RANGE);
return c.NSS_STATUS_TRYAGAIN;
},
};
result.* = cuser;
return c.NSS_STATUS_SUCCESS;
}
export fn _nss_turbo_initgroups_dyn(
user_name: [*:0]const u8,
_: u32,
start: *c_long,
size: *c_long,
groups: [*]u32,
limit: c_long,
errnop: *c_int,
) c.enum_nss_status {
const db = getDBErrno(errnop) orelse return c.NSS_STATUS_UNAVAIL;
const user = db.getUser(mem.sliceTo(user_name, 0)) orelse {
errnop.* = @enumToInt(os.E.NOENT);
return c.NSS_STATUS_NOTFOUND;
};
_ = user;
_ = start;
_ = size;
_ = groups;
_ = limit;
return c.NSS_STATUS_SUCCESS;
}
fn getState() ?State {